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EP3160857B1 - Metal cover for a container body - Google Patents

Metal cover for a container body Download PDF

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Publication number
EP3160857B1
EP3160857B1 EP15742361.7A EP15742361A EP3160857B1 EP 3160857 B1 EP3160857 B1 EP 3160857B1 EP 15742361 A EP15742361 A EP 15742361A EP 3160857 B1 EP3160857 B1 EP 3160857B1
Authority
EP
European Patent Office
Prior art keywords
section
residual thickness
upstream
scoreline
upstream portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15742361.7A
Other languages
German (de)
French (fr)
Other versions
EP3160857A1 (en
Inventor
Fabrice Leboucher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trivium Packaging West France SAS
Original Assignee
Ardagh MP West France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ardagh MP West France SA filed Critical Ardagh MP West France SA
Priority to PL15742361T priority Critical patent/PL3160857T3/en
Publication of EP3160857A1 publication Critical patent/EP3160857A1/en
Application granted granted Critical
Publication of EP3160857B1 publication Critical patent/EP3160857B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
    • B65D17/4011—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall for opening completely by means of a tearing tab
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/404—Details of the lines of weakness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/001—Action for opening container
    • B65D2517/0013—Action for opening container pull-out tear panel, e.g. by means of a tear-tab

Definitions

  • the present invention relates to the general field of packaging, and in particular that of metal lids for a container of the kind can. It relates more particularly to metal caps of the type comprising a removable part which is delimited by a line of initiation of rupture and which is equipped with an opening member, according to the preamble of claim 1. Such a cover is disclosed by the document US 2007/131693 A1 .
  • Some metal containers mainly canning cans for food packaging, are equipped with an "easy” opening system (or “EOE” for "Easy Open End”), avoiding the use of type can opener.
  • EAE Easy Opening System
  • the breaking initiation line is torn by manipulation of an opening member carried by the central panel, commonly known as the "opening ring”.
  • the opening member is pressed against the upper surface of the central panel.
  • the user For opening, the user is led to maneuver the opening member in two successive and distinct steps.
  • the user grasps the opening member, generally by its central gripping portion, and then away from the central portion.
  • the opening member then forms a lever, so that its peripheral portion of incision in the form of a beak causes a local breakage of the breaking initiation line.
  • This rotational maneuver leads to the tearing of two upstream portions, on either side of the longitudinal axis of the opening member.
  • the removable portion of the lid is then folded locally inward, along a virtual axis which is oriented perpendicularly, or approximately perpendicularly, with respect to the longitudinal axis of the opening member.
  • a second opening step the user exerts traction on the opening member so as to continue tearing the tear initiation line and dissociate all or part of the removable portion relative to the cover.
  • the opening member thus allows the transmission of the force applied by the user, and the energy generated, to the removable portion of the metal cover, so as to ensure the tearing of the metal along the primer line. a break.
  • this depression is of the order of 600 to 700 mbar for canned corn, and of the order of 850 to 900 mbar for canned vegetables steamed.
  • the rupture of the equilibrium holding the removable part in place is likely to generate a propagation of the tear of the rupture initiation line, because of the tearing force which is relatively low once it has been removed. There was initiation of tearing of this line of initiation of rupture.
  • Such a structure then generates a punctual blocking of the opening during the tearing of the upstream portions of the breaking initiation line.
  • the increase in hardness of the material, and / or the reduction of the thicknesses used for the cover can show an influence of the rolling direction.
  • the tear is likely not to propagate along the breaking initiation line, as desired, but in the central panel shutter.
  • the Applicant has developed a new structure of metal lid with easy opening, which also makes it possible not to punctually block the opening during the tearing of the upstream portions of the breaking initiation line, but to regulate gradually the energy used for this tear.
  • the central portion comprises a removable portion which is delimited by a breaking initiation line having a variable residual thickness and which is equipped with an opening member.
  • This opening member comprises, on either side of a fixing portion with the removable portion, a peripheral incision portion and a central gripping portion.
  • the upstream and downstream portions are formed on either side of a virtual axis extending perpendicularly to the longitudinal axis of the opening member, said corresponding virtual axis at the fold line generated on the removable portion following a pivoting of said opening member and the tearing of said upstream portions.
  • the second portion extends over at least 20%, preferably at least 25%, more preferably between 25% and 60% of the length of said upstream portion.
  • the structure of the breaking initiation line according to the invention thus makes it possible to engage on second sections, the tear of which will continue to be progressively made and at a greater level of effort.
  • the present invention also relates to a container, in particular of the metal cans type, equipped with a metal lid as defined above.
  • the present invention further relates to a method for manufacturing a lid according to the invention, which method comprises a step of incising the breaking initiation line in said lid, by means of an incision tool comprising a upper member (for example an incision block) and a lower member (for example an anvil) each carrying a profile.
  • an incision tool comprising a upper member (for example an incision block) and a lower member (for example an anvil) each carrying a profile.
  • the present invention also relates to the installation for the manufacture of a metal cover according to the invention, comprising an incision tool to provide the rupture initiation line, which incision tool comprises an upper member (for example a incision block) and a lower member (for example an anvil), each having an incision profile.
  • incision tool comprises an upper member (for example a incision block) and a lower member (for example an anvil), each having an incision profile.
  • the incision position profiles define, between them, a space of variable width to generate the upstream portions of the breaking initiation line according to the invention.
  • the metal cover 1, shown on the figure 1 is intended to be assembled on the upper edge of a metal container body (not shown).
  • This container body generally consists of a bottom associated with the lower edge of a sidewall belt (circular section, square, rectangular, etc.).
  • connection between the metal lid 1 and the upper edge of this container body is carried out in the usual manner, for example by a crimping technique.
  • This metal cover 1 is of the "easy open” type (or “EOE” for "Easy Open End”), avoiding the use of tools such as openers.
  • This metal cover 1 is advantageously made monobloc by a stamping technique, that from a sheet metal material (preferably aluminum, steel, etc.).
  • the peripheral portion 3 is here ring-shaped or ring-shaped. It is adapted for fixing the metal cover 1, advantageously by crimping, on the upper edge of a container body having a cylindrical side wall.
  • peripheral portion 3 may have any other shape (for example square, rectangular), which would be adapted to the section of the container body (if any parallelepipedic).
  • the distance between these two faces 21, 22 corresponds to the nominal thickness N of the central portion 2 ( figure 2 ).
  • This nominal thickness N of the central portion 2 is for example between 0.14 and 0.28 mm, preferably between 0.16 and 0.25 mm.
  • the central portion 2 comprises a removable portion 4 intended to constitute the access opening to the contents of the container.
  • the removable part 4 is, on the one hand, delimited by a breaking initiation line 5, also called “incision line” and, on the other hand, equipped with an opening member 6.
  • the opening member 6 is formed at the upper face 21 of the central part 2, covering the removable part 4 ( figure 1 ).
  • this opening member 6 by a user will allow easy opening of the metal cover 1, that is to say a total or partial disengagement, the removable part 4 by tearing the primer line of rupture 5.
  • opening member 6 which is well known, is also known by the name of "opening ring”.
  • the breaking initiation line 5 consists of a thinning of material, constituting a structure of lesser resistance.
  • This line of initiation of rupture 5 is here complete (closed), and advantageously of circular form ( figure 1 ). Alternatively, it could be partial (for example in an arc) and / or have any other shape (square, rectangular for example).
  • the upper surface 51 of this breaking initiation line 5 is formed by an upper groove 53 formed in the upper face 21 of the central portion 2.
  • This breaking initiation line 5 could also be formed, alternately or additionally, by a groove 54 which would be formed in the lower face 22 of the central portion 2 (as schematically illustrated in FIG. figure 2 in broken lines). Where appropriate, this lower groove 54 then forms the lower surface 52 of the breaking initiation line 5.
  • the two upstream portions 55 extend on either side of the longitudinal axis 6 'of the opening member 6.
  • Each upstream portion 55, on the one hand, and the downstream portion 56, on the other hand, are here separated by a virtual axis 10 represented on the figure 1 .
  • the virtual axis 10 corresponds, at least approximately, to the fold line generated on the removable part 4 following the pivoting of the opening member 6.
  • this virtual axis 10 extends perpendicularly to the longitudinal axis 6 'of the opening member 6.
  • This virtual axis 10 advantageously passes, at least approximately, at the level of the fixing portion 8.
  • each upstream portion 55 of the breaking initiation line 5 comprises, on its length, a specific evolution of its residual thickness E.
  • the upper groove 53 and / or the lower groove 54 thus have a variable depth at each upstream portion 55 of the breaking initiation line 5 to define this residual thickness E variable.
  • each section 551, 552 and 553 of the upstream portion 55 each form a bearing.
  • Each section 551, 552 and 553 of the upstream portion 55 thus has a residual thickness E1 , E2 , E3 , respectively, constant along its length L1 , L2 , L3 .
  • the residual thickness E2 of the second section 552 is greater than the residual thickness E1 , E3 of the first section 551 and the third section 553, respectively.
  • the first section 551 and the third section 553 of the upstream portion 55 additionally have residual thicknesses E1 , E3 that are identical relative to one another.
  • the residual thickness E1 , E3 of these first section 551 and third section 553 is advantageously identical, or at least approximately identical, to the majority residual thickness E4 of the downstream portion 56.
  • major residual thickness is meant in particular the residual thickness E4 of the downstream portion 56 over its entire length or practically its entire length, excluding any point segments having a residual thickness variation E aimed at master his tear.
  • the first section 551 and the third section 553 of the upstream portion 55 have residual thicknesses E1 , E3 of between 45 and 80 ⁇ m for steel metal covers.
  • the residual thickness E2 of the second section 552 comprises an additional residual thickness E2 ' , with respect to the residual thickness E1 , E3 of the first section 551 and the third section 553.
  • this additional residual thickness E2 ' is between 10 and 50 ⁇ m, preferably between 15 and 35 ⁇ m.
  • the second section 552 extends over a length L2 corresponding to at least 20%, preferably at least 25%, more preferably 25% to 60%, of the length L of this upstream portion 55.
  • the upstream end 5521 is advantageously located at a distance from the initial point A.
  • the downstream end 5522 is formed here within the upstream portion 55, away from the end point B.
  • this downstream end 5522 of the second section 552 could be located at the end point B of the upstream portion 55, connected directly with one end of the downstream portion 56 of the breaking initiation line 5.
  • the upstream end 5521 and the downstream end 5522 here consist of a sudden change in the residual thickness.
  • the upstream end 5521 of the second section 552 is advantageously at a distance of between 3 and 8 mm from the initial point A of the upstream portion 55 (corresponding to the length L1 of the first section 551).
  • the two upstream portions 55 of the breaking initiation line 5 advantageously extend symmetrically on either side of the longitudinal axis 6 'of the opening member 6.
  • the user operates the opening member 6 in two successive and distinct operations.
  • the user grasps the opening member 6, generally by its central gripping portion 9, and then moves it away from the central portion 2.
  • the opening member 6 then forms a lever, the incision-shaped peripheral portion 7 in the form of a beak causes a local break of the breaking initiation line 5, within the first section 551 of the two upstream portions 55.
  • This tear propagates along the two upstream portions 55, on either side of the longitudinal axis 6 'of the opening member 6, towards their respective end points B.
  • the tear then continues within the second two sections 552 of the upstream portions 55, in a progressive manner and at a greater level of effort.
  • This mechanism allows a slowing of the opening speed, during which a pressure equalization is carried out between the interior of the container and the environment, without risk of collapse of the lid.
  • the removable part 4 of the cover 1 is then folded locally inwards along the virtual axis 10.
  • a second opening step in a conventional manner, the user pulls on the opening member 6 so as to continue the tearing of the breaking initiation line 5, in particular its downstream portion 56, and to dissociate all or part of the removable part 4 with respect to the lid 1.
  • a metal cover 1 according to the invention can be obtained through a method comprising a step of incising the breaking initiation line 5 in the cover 1, by means of an incising tool 12 as represented schematically on the figure 4 .
  • Such an incision tool 12 comprises an upper member 121, for example an incision block, and a lower member 122, for example an anvil.
  • the upper member 121 and the lower member 122 have profiles 1211 and 1221 facing each other, to define the section of the breaking initiation line 5.
  • the geometry of the profile 1211, 1221 of the incision block 121 and / or of the anvil 122 acts on the residual thickness E of the breaking initiation line 5.
  • the profile 1211 of the upper member 121 constitutes an incision profile intended to conform the upper groove 53 of the breaking initiation line 5.
  • the incision profile 1211 of the upper member 121 has a profile complementary to that of the each of upstream portion 55, with in particular a reservation 1212 intended to define the second section 552 of the breaking initiation line 5.
  • the method for manufacturing a lid 1 according to the invention firstly comprises the provision of a lid to be incised.
  • the profiles 1211, 1221 of said incision tool 121 are brought together by a translation movement, to generate the upper and / or lower grooves 54 in the central part 2 of the cover 1.
  • the profiles 1211, 1221 thus define, between them, a space of variable width along the length of said profiles, which is complementary to the residual thickness E of the breaking initiation line 5, for generate in particular the sections 551, 552 and 553 of the upstream portions 55 of the breaking initiation line 5.
  • Variants of Figures 6 and 7 differ from the structure described above in relation to the Figures 1 to 3 by the structure of the upstream ends 5521 and downstream 5522 of the second section 552.
  • these ends 5521, 5522 consist of straight slopes, respectively upward and downward.
  • this variation in thickness takes place over a length of between 0.3 and 0.7 mm.
  • downstream end 5522 extends over a longer length than the length of the upstream end 5521.
  • This structural characteristic has the advantage of softening the variation of effort felt by the consumer.
  • the upstream end 5521 has a discontinuous gradual variation of the residual thickness E.
  • this upstream end 5521 has the shape of a staircase or a succession of bearings.
  • This structural characteristic also has the advantage of softening the variation of effort felt by the consumer.
  • Variants of Figures 8 to 12 differ from the structure described above in relation to the Figures 1 to 3 by a residual thickness E2 variable of the second section 552.
  • the additional residual thickness E2 ' corresponds to the maximum residual thickness of this second section 552.
  • the second section 552 comprises a continuous progressive variation of the residual thickness E2 , with an increasing linear slope greater than a decreasing linear slope.
  • the second section 552 comprises a continuous progressive variation of the residual thickness E2 , with an increasing linear slope that is identical, or at least approximately identical, to the decreasing linear slope.
  • the second section 552 has a variation of curved thickness, for example in an arc.
  • the second section 552 has a thickness variation of generally oscillating shape, broken on the figure 11 and curve on the figure 12 .
  • the residual thickness E2 of the second section 552 oscillates between a minimum value E21 and a maximum value E22 which both remain greater than the residual thickness E1 , E3 of the first and third sections 551, 553.
  • the lid structure according to the invention has the advantage of preserving an ease of opening, while offering an effective solution to the risk of implosion at the opening and the risk of tearing of the removable part due to its rolling direction.
  • the cover structure according to the invention makes it possible, for the same thickness of the cover and of the breaking initiation line, to have an increased resistance to implosion compared to a system of the "flat arrester" type.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)

Description

DOMAINE TECHNIQUE AUQUEL SE RAPPORTE L'INVENTIONTECHNICAL FIELD TO WHICH THE INVENTION REFERS

La présente invention concerne le domaine général de l'emballage, et en particulier celui des couvercles métalliques pour un contenant du genre boîte de conserve. Elle concerne plus particulièrement les couvercles métalliques du type comportant une partie amovible qui est délimitée par une ligne d'amorce de rupture et qui est équipée d'un organe d'ouverture, selon le préambule de la revendication 1. Un tel couvercle est divulgue par le document US 2007/131693 A1 .The present invention relates to the general field of packaging, and in particular that of metal lids for a container of the kind can. It relates more particularly to metal caps of the type comprising a removable part which is delimited by a line of initiation of rupture and which is equipped with an opening member, according to the preamble of claim 1. Such a cover is disclosed by the document US 2007/131693 A1 .

ARRIERE-PLAN TECHNOLOGIQUEBACKGROUND

Certains contenants métalliques, principalement les boîtes de conserves pour le conditionnement de denrées alimentaires, sont pourvus d'un système d'ouverture dit « facile » (ou « EOE » pour « Easy Open End »), évitant l'utilisation d'outils de type ouvre-boîtes.Some metal containers, mainly canning cans for food packaging, are equipped with an "easy" opening system (or "EOE" for "Easy Open End"), avoiding the use of type can opener.

A cet effet, une solution couramment mise en oeuvre consiste en un couvercle métallique monobloc comportant deux parties, à savoir :

  • une partie périphérique en forme de bague, destinée à être solidarisée avec le corps de contenant et
  • un panneau central d'obturation comprenant une partie amovible qui est délimitée par une ligne d'amorce de rupture.
For this purpose, a solution commonly used consists of a one-piece metal cover comprising two parts, namely:
  • a peripheral ring-shaped portion intended to be secured to the container body and
  • a central obturation panel comprising a removable part which is delimited by a breaking initiation line.

Pour la séparation de la partie amovible, la ligne d'amorce de rupture est déchirée par une manipulation d'un organe d'ouverture porté par le panneau central, couramment connu sous le nom de « anneau d'ouverture ».For the separation of the removable part, the breaking initiation line is torn by manipulation of an opening member carried by the central panel, commonly known as the "opening ring".

Ce type d'organe d'ouverture comprend classiquement trois parties, ménagées successivement sur sa longueur, à savoir :

  • une partie périphérique d'incision, dite « bec »,
  • une partie intermédiaire de fixation avec la partie amovible du couvercle, classiquement de type rivet, et
  • une partie centrale de préhension, classiquement en forme de boucle ou d'anneau.
This type of opening member conventionally comprises three parts, formed successively along its length, namely:
  • a peripheral part of incision, called "beak",
  • an intermediate fixing part with the removable part of the cover, conventionally of the rivet type, and
  • a central gripping portion, conventionally shaped loop or ring.

En pratique, avant l'ouverture du couvercle métallique, l'organe d'ouverture est plaqué contre la surface supérieure du panneau central.In practice, before opening the metal cover, the opening member is pressed against the upper surface of the central panel.

Pour l'ouverture, l'utilisateur est amené à manoeuvrer l'organe d'ouverture selon deux étapes successives et distinctes.For opening, the user is led to maneuver the opening member in two successive and distinct steps.

Tout d'abord, dans une première étape d'amorce de l'ouverture, l'utilisateur saisit l'organe d'ouverture, en général par sa partie centrale de préhension, puis il l'écarte de la partie centrale.First, in a first step of initiating the opening, the user grasps the opening member, generally by its central gripping portion, and then away from the central portion.

L'organe d'ouverture forme alors un levier, de sorte que sa partie périphérique d'incision en forme de bec provoque une cassure locale de la ligne d'amorce de rupture.The opening member then forms a lever, so that its peripheral portion of incision in the form of a beak causes a local breakage of the breaking initiation line.

Cette manoeuvre en rotation conduit à la déchirure de deux portions amont, de part et d'autre de l'axe longitudinal de l'organe d'ouverture.This rotational maneuver leads to the tearing of two upstream portions, on either side of the longitudinal axis of the opening member.

La partie amovible du couvercle est alors pliée localement vers l'intérieur, selon un axe virtuel qui est orienté perpendiculairement, ou approximativement perpendiculairement, par rapport à l'axe longitudinal de l'organe d'ouverture.The removable portion of the lid is then folded locally inward, along a virtual axis which is oriented perpendicularly, or approximately perpendicularly, with respect to the longitudinal axis of the opening member.

Dans une seconde étape d'ouverture, l'utilisateur exerce une traction sur l'organe d'ouverture de sorte à poursuivre la déchirure de la ligne d'amorce de rupture et à dissocier tout ou partie de la partie amovible par rapport au couvercle.In a second opening step, the user exerts traction on the opening member so as to continue tearing the tear initiation line and dissociate all or part of the removable portion relative to the cover.

L'organe d'ouverture permet donc la transmission de la force appliquée par l'utilisateur, et de l'énergie générée, vers la partie amovible du couvercle métallique, de sorte à assurer la déchirure du métal le long de la ligne d'amorce de rupture.The opening member thus allows the transmission of the force applied by the user, and the energy generated, to the removable portion of the metal cover, so as to ensure the tearing of the metal along the primer line. a break.

La facilité de l'ouverture est définie par le niveau de force et d'énergie requis pour rompre cette ligne d'amorce de rupture, qui est en pratique réduite au maximum.The ease of opening is defined by the level of force and energy required to break this breaking initiation line, which is in practice reduced to the maximum.

Toutefois, ces couvercles à ouverture facile doivent aussi résister à des phénomènes d'implosion par dépression interne lors du stockage, du fait de leur remplissage sous vide ou du fait de l'utilisation de techniques de cuisson particulières (telles que la cuisson à la vapeur).However, these easy-open lids must also withstand internal vacuum implosion phenomena during storage, because of their vacuum filling or because of the use of particular cooking techniques (such as steaming). ).

Par exemple, cette dépression est de l'ordre de 600 à 700 mbar pour les conserves de maïs, et de l'ordre de 850 à 900 mbar pour les conserves de légumes cuits à la vapeur.For example, this depression is of the order of 600 to 700 mbar for canned corn, and of the order of 850 to 900 mbar for canned vegetables steamed.

Un tel phénomène d'implosion, avec affaissement de la partie amovible du panneau central d'obturation, est également susceptible de survenir à l'ouverture.Such an implosion phenomenon, with collapse of the removable portion of the central shutter panel, is also likely to occur at the opening.

En effet, la rupture de l'équilibre tenant la partie amovible en place est susceptible de générer une propagation de la déchirure de la ligne d'amorce de rupture, en raison de l'effort de déchirure qui est relativement faible une fois qu'il y a eu initiation de déchirure de cette ligne d'amorce de rupture.Indeed, the rupture of the equilibrium holding the removable part in place is likely to generate a propagation of the tear of the rupture initiation line, because of the tearing force which is relatively low once it has been removed. There was initiation of tearing of this line of initiation of rupture.

Pour prévenir ce dernier phénomène d'affaissement à l'ouverture, il est habituel de maîtriser la déchirure des portions amont de la ligne d'amorce de rupture par des points « stop » qui visent à bloquer précocement le mouvement de déchirure de cette ligne d'amorce de rupture.To prevent this last phenomenon of sagging at the opening, it is usual to control the tearing of the upstream portions of the line of rupture initiation by "stop" points which aim to block early the tearing movement of this line. breaking point.

A cet effet, il est courant de prévoir une ou deux variations ponctuelles de l'épaisseur résiduelle dans chacune des portions amont de la ligne d'amorce de rupture, sur une longueur de l'ordre du millimètre, désignées classiquement « arrester flat ».For this purpose, it is common to provide one or two point variations of the residual thickness in each of the upstream portions of the breaking initiation line, over a length of the order of one millimeter, conventionally designated "flat arrester".

L'utilisateur continuant son mouvement pour réaliser l'ouverture, cela implique alors une augmentation de la force à appliquer (jusqu'à ce que la force de rupture de cet « arrester flat » soit atteinte).The user continues his movement to achieve the opening, it then implies an increase in the force to be applied (until the breaking force of this "flat arrester" is reached).

Cela entraîne une « pose » dans l'ouverture du couvercle, qui permet alors un équilibrage (ou rééquilibrage) des pressions avec une suppression du risque d'affaissement.This causes a "pose" in the opening of the lid, which then allows a balancing (or rebalancing) pressures with a suppression of the risk of sagging.

Du point de vue du déroulement de la propagation de la déchirure, les « arrester flat » ont ainsi un rôle d'arrêt de cette propagation.From the point of view of the progress of the propagation of the tear, the "flat arrester" thus have a stopping role of this propagation.

Une telle structure génère alors un blocage ponctuel de l'ouverture lors de la déchirure des portions amont de la ligne d'amorce de rupture.Such a structure then generates a punctual blocking of the opening during the tearing of the upstream portions of the breaking initiation line.

Cet arrêt nécessite alors un effort accru pour reprendre/continuer la déchirure de la ligne d'amorce de rupture.This stop then requires an increased effort to resume / continue the tear of the breaking initiation line.

De plus, la montée en dureté du matériau, et/ou la diminution des épaisseurs, utilisées pour le couvercle peuvent faire apparaître une influence du sens de laminage.In addition, the increase in hardness of the material, and / or the reduction of the thicknesses used for the cover can show an influence of the rolling direction.

La force nécessaire pour la rupture d'un « arrester flat », et en particulier l'effort supplémentaire pour reprendre la déchirure de la ligne d'amorce de rupture, est alors susceptible de provoquer une rupture intempestive du panneau central d'obturation.The force required for breaking an "arrester flat", and in particular the additional effort to resume the tearing of the rupture initiation line, is then likely to cause an inadvertent rupture of the central shutter panel.

En effet, dans ce cas, la déchirure est susceptible de ne pas se propager le long de la ligne d'amorce de rupture, comme désirée, mais dans le panneau central d'obturation.Indeed, in this case, the tear is likely not to propagate along the breaking initiation line, as desired, but in the central panel shutter.

En outre, en pratique, il est possible que l'utilisateur manoeuvre l'organe d'ouverture d'une manière brusque, supprimant alors l'effet de blocage ponctuel de la déchirure.In addition, in practice, it is possible for the user to maneuver the opening member in a sudden manner, thereby eliminating the punctual locking effect of the tear.

Dans ce contexte, il existe un besoin d'un couvercle métallique permettant une maitrise de l'ouverture, d'une part, pour contrôler la rupture du différentiel de pression, sans risque d'affaissement du panneau central d'obturation et, d'autre part, pour supprimer le risque de rupture du panneau central d'obturation du fait de son sens de laminage.In this context, there is a need for a metal cover allowing control of the opening, on the one hand, to control the breaking of the pressure differential, without risk of collapse of the central shutter panel and, on the other hand, to eliminate the risk of rupture of the central shutter panel due to its rolling direction.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

Pour remédier à ces inconvénients, la demanderesse a développé une nouvelle structure de couvercle métallique à ouverture facile, qui permet, non plus de bloquer ponctuellement l'ouverture lors de la déchirure des portions amont de la ligne d'amorce de rupture, mais de réguler progressivement l'énergie utilisée pour cette déchirure.To remedy these drawbacks, the Applicant has developed a new structure of metal lid with easy opening, which also makes it possible not to punctually block the opening during the tearing of the upstream portions of the breaking initiation line, but to regulate gradually the energy used for this tear.

Le couvercle métallique selon l'invention comprend :

  • une partie centrale formant un panneau central d'obturation, et
  • une partie périphérique adaptée à être solidarisée avec le corps de contenant.
The metal lid according to the invention comprises:
  • a central portion forming a central shutter panel, and
  • a peripheral portion adapted to be secured to the container body.

La partie centrale comprend une partie amovible qui est délimitée par une ligne d'amorce de rupture présentant une épaisseur résiduelle variable et qui est équipée d'un organe d'ouverture.The central portion comprises a removable portion which is delimited by a breaking initiation line having a variable residual thickness and which is equipped with an opening member.

Cet organe d'ouverture comporte, de part et d'autre d'une partie de fixation avec la partie amovible, une partie périphérique d'incision et une partie centrale de préhension.This opening member comprises, on either side of a fixing portion with the removable portion, a peripheral incision portion and a central gripping portion.

La ligne d'amorce de rupture comprend :

  • deux portions amont, destinées à être déchirées par une manoeuvre en pivotement initial dudit organe d'ouverture, s'étendant de part et d'autre de l'axe longitudinal de l'organe d'ouverture, et
  • une portion aval, constituée par la longueur restante de ladite ligne d'amorce de rupture et destinée à être déchirée par une manoeuvre suivante en traction sur l'organe d'ouverture pivoté.
The breaking initiation line includes:
  • two upstream portions, intended to be torn by an initial pivoting maneuver of said opening member, extending on either side of the longitudinal axis of the opening member, and
  • a downstream portion, constituted by the remaining length of said breaking initiation line and intended to be torn by a subsequent maneuver in traction on the pivoted opening member.

Les portions amont et aval sont ménagées de part et d'autre d'un axe virtuel s'étendant perpendiculairement à l'axe longitudinal de l'organe d'ouverture, ledit axe virtuel correspondant à la ligne de pliage générée sur la partie amovible suite à un pivotement dudit organe d'ouverture et à la déchirure desdites portions amont.The upstream and downstream portions are formed on either side of a virtual axis extending perpendicularly to the longitudinal axis of the opening member, said corresponding virtual axis at the fold line generated on the removable portion following a pivoting of said opening member and the tearing of said upstream portions.

Et conformément à l'invention, chaque portion amont de la ligne d'amorce de rupture comporte, successivement dans le sens de déchirure, au moins deux tronçons :

  • un premier tronçon comportant une première épaisseur résiduelle, et
  • un second tronçon comportant une épaisseur résiduelle supérieure à ladite première épaisseur résiduelle (et avantageusement supérieure également à l'épaisseur résiduelle majoritaire de ladite portion aval).
And according to the invention, each upstream portion of the breaking initiation line comprises, successively in the tearing direction, at least two sections:
  • a first section having a first residual thickness, and
  • a second section having a residual thickness greater than said first residual thickness (and advantageously also greater than the majority residual thickness of said downstream portion).

Le second tronçon s'étend sur au moins 20%, de préférence sur au moins 25 %, de préférence encore entre 25 % et 60 % de la longueur de ladite portion amont.The second portion extends over at least 20%, preferably at least 25%, more preferably between 25% and 60% of the length of said upstream portion.

Ledit second tronçon de chaque portion amont de la ligne d'amorce de rupture comporte :

  • une extrémité amont, raccordée au premier tronçon, et
  • une extrémité aval, ménagée au sein de ladite portion amont.
Said second section of each upstream portion of the breaking initiation line comprises:
  • an upstream end, connected to the first section, and
  • a downstream end formed in said upstream portion.

La structure de la ligne d'amorce de rupture selon l'invention permet ainsi de s'engager sur des seconds tronçons dont la déchirure va continuer à se faire progressivement et à un niveau d'effort plus important.The structure of the breaking initiation line according to the invention thus makes it possible to engage on second sections, the tear of which will continue to be progressively made and at a greater level of effort.

Selon d'autres caractéristiques de réalisation avantageuses, pouvant être prises en combinaison ou indépendamment les unes des autres :

  • l'extrémité aval du second tronçon est raccordée avec la portion aval (i) directement ou (ii) par le biais d'un troisième tronçon dont l'épaisseur résiduelle est inférieure à l'épaisseur résiduelle dudit second tronçon de la portion amont ;
  • l'extrémité amont et/ou l'extrémité aval du second tronçon de la portion amont comportent : - une variation brusque de l'épaisseur résiduelle, ou - une variation progressive continue de l'épaisseur résiduelle (par exemple sur une longueur comprise entre 0,3 et 0,7 mm) ou - une variation progressive discontinue de l'épaisseur résiduelle (par exemple en escalier) ;
  • l'extrémité amont et l'extrémité aval du second tronçon de la portion amont comportent chacune une variation progressive de l'épaisseur résiduelle, et l'extrémité aval s'étend sur une longueur supérieure à la longueur de l'extrémité amont ;
  • le premier tronçon de la portion amont de la ligne d'amorce de rupture comporte une épaisseur résiduelle constante, et le second tronçon de la portion amont de la ligne d'amorce de rupture comporte une épaisseur résiduelle constante ou variable ;
  • la différence d'épaisseurs résiduelles entre le premier tronçon et le second tronçon de chaque portion amont est comprise entre 10 et 50 µm ;
  • le premier tronçon, et le cas échéant le troisième tronçon, de chaque portion amont comporte une épaisseur résiduelle identique, ou au moins approximativement identique, à l'épaisseur résiduelle majoritaire de la portion aval ;
  • la ligne d'amorce de rupture est formée par une rainure inférieure et/ou par une rainure supérieure qui sont ménagées, respectivement, dans une face inférieure et/ou une face supérieure de la partie centrale du couvercle, et ladite rainure supérieure et/ou ladite rainure inférieure ont une profondeur variable au niveau de chaque portion amont de la ligne d'amorce de rupture ;
  • les portions amont de la ligne d'amorce de rupture s'étendent symétriquement de part et d'autre de l'axe longitudinal de l'organe d'ouverture.
According to other advantageous features of realization, which can be taken in combination or independently of each other:
  • the downstream end of the second section is connected with the downstream portion (i) directly or (ii) through a third section whose residual thickness is less than the residual thickness of said second portion of the upstream portion;
  • the upstream end and / or the downstream end of the second portion of the upstream portion comprise: a sudden variation of the residual thickness, or a continuous progressive variation of the residual thickness (for example over a length of between 0.degree. , 3 and 0.7 mm) or - a discontinuous gradual variation of the residual thickness (for example in steps);
  • the upstream end and the downstream end of the second section of the upstream portion each comprise a progressive variation of the residual thickness, and the downstream end extends over a length greater than the length of the upstream end;
  • the first section of the upstream portion of the rupture initiation line comprises a constant residual thickness, and the second section of the upstream portion of the rupture initiation line comprises a constant or variable residual thickness;
  • the difference in residual thicknesses between the first section and the second section of each upstream portion is between 10 and 50 μm;
  • the first section, and if necessary the third section, of each upstream portion has a residual thickness identical to, or at least approximately identical to, the residual majority thickness of the downstream portion;
  • the breaking initiation line is formed by a lower groove and / or an upper groove which are provided, respectively, in a lower face and / or a face upper of the central part of the cover, and said upper groove and / or said lower groove have a variable depth at each upstream portion of the breaking initiation line;
  • the upstream portions of the rupture initiation line extend symmetrically on either side of the longitudinal axis of the opening member.

La présente invention concerne également un contenant, en particulier du genre boîte de conserve métallique, équipé d'un couvercle métallique tel que défini ci-dessus.The present invention also relates to a container, in particular of the metal cans type, equipped with a metal lid as defined above.

La présente invention concerne encore un procédé pour la fabrication d'un couvercle selon l'invention, lequel procédé comprend une étape d'incision de la ligne d'amorce de rupture dans ledit couvercle, au moyen d'un outil d'incision comprenant un organe supérieur (par exemple un bloc d'incision) et un organe inférieur (par exemple une enclume) portant chacun un profil.The present invention further relates to a method for manufacturing a lid according to the invention, which method comprises a step of incising the breaking initiation line in said lid, by means of an incision tool comprising a upper member (for example an incision block) and a lower member (for example an anvil) each carrying a profile.

Dans le cadre de l'invention, lors de ladite étape d'incision, les profils dudit outil d'incision sont agencés pour générer lesdites portions amont de la ligne d'amorce de rupture, chaque portion amont de la ligne d'amorce de rupture comporte, successivement dans le sens de déchirure, au moins deux tronçons :

  • un premier tronçon comportant une première épaisseur résiduelle, et
  • un second tronçon comportant une épaisseur résiduelle supérieure à ladite première épaisseur résiduelle,
lequel second tronçon s'étend sur au moins 20 % de la longueur de ladite portion amont,
lequel second tronçon de chaque portion amont de la ligne d'amorce de rupture comporte :
  • une extrémité amont, raccordée au premier tronçon, et
  • une extrémité aval, ménagée au sein de ladite portion amont.
In the context of the invention, during said incising step, the profiles of said incision tool are arranged to generate said upstream portions of the rupture initiation line, each upstream portion of the rupture initiation line. comprises, successively in the tearing direction, at least two sections:
  • a first section having a first residual thickness, and
  • a second section having a residual thickness greater than said first residual thickness,
which second section extends over at least 20% of the length of said upstream portion,
which second section of each upstream portion of the breaking initiation line comprises:
  • an upstream end, connected to the first section, and
  • a downstream end formed in said upstream portion.

La présente invention concerne aussi l'installation pour la fabrication d'un couvercle métallique selon l'invention, comprenant un outil d'incision pour ménager la ligne d'amorce de rupture, lequel outil d'incision comprend un organe supérieur (par exemple un bloc d'incision) et un organe inférieur (par exemple une enclume), portant chacun un profil d'incision.The present invention also relates to the installation for the manufacture of a metal cover according to the invention, comprising an incision tool to provide the rupture initiation line, which incision tool comprises an upper member (for example a incision block) and a lower member (for example an anvil), each having an incision profile.

Conformément à l'invention, les profils en position incision définissent, entre eux, un espace d'une largeur variable pour générer les portions amont de la ligne d'amorce de rupture selon l'invention.According to the invention, the incision position profiles define, between them, a space of variable width to generate the upstream portions of the breaking initiation line according to the invention.

Chaque portion amont de la ligne d'amorce de rupture comporte, successivement dans le sens de déchirure, au moins deux tronçons :

  • un premier tronçon comportant une première épaisseur résiduelle, et
  • un second tronçon comportant une épaisseur résiduelle supérieure à ladite première épaisseur résiduelle,
lequel second tronçon s'étend sur au moins 20 % de la longueur de ladite portion amont,
lequel second tronçon de chaque portion amont de la ligne d'amorce de rupture comporte :
  • une extrémité amont, raccordée au premier tronçon, et
  • une extrémité aval, ménagée au sein de ladite portion amont.
Each upstream portion of the breaking initiation line comprises, successively in the tearing direction, at least two sections:
  • a first section having a first residual thickness, and
  • a second section having a residual thickness greater than said first residual thickness,
which second section extends over at least 20% of the length of said upstream portion,
which second section of each upstream portion of the breaking initiation line comprises:
  • an upstream end, connected to the first section, and
  • a downstream end formed in said upstream portion.

DESCRIPTION DETAILLEE D'UN EXEMPLE DE REALISATIONDETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT

La présente invention sera encore illustrée, sans être aucunement limitée, par la description suivante de modes de réalisation particuliers en relation avec les figures annexées dans lesquelles :

  • la figure 1 représente, vu de dessus, un couvercle métallique selon l'invention ;
  • la figure 2 représente, schématiquement, une section transversale de la ligne d'amorce de rupture ménagée dans le couvercle métallique ;
  • la figure 3 représente, schématiquement, un développé de la section longitudinale de l'une des portions amont de la ligne d'amorce de rupture ménagée dans le couvercle métallique, montrant l'évolution de son épaisseur résiduelle sur sa longueur ;
  • la figure 4 illustre schématiquement l'outil pour ménager la ligne d'amorce de rupture selon l'invention dans le couvercle métallique ;
  • la figure 5 représente schématiquement le profil d'incision de l'organe supérieur de l'outil d'incision selon la figure 4, adapté pour ménager une ligne d'amorce de rupture selon la figure 3 ;
  • les figures 6 à 12 représentent chacune, schématiquement, un développé de la section longitudinale d'une variante de réalisation d'une portion amont de la ligne d'amorce de rupture ménagée dans le couvercle métallique, montrant la variation de son épaisseur résiduelle sur sa longueur.
The present invention will be further illustrated, without being limited in any way, by the following description of particular embodiments in relation to the appended figures in which:
  • the figure 1 represents, seen from above, a metal cover according to the invention;
  • the figure 2 represents, schematically, a cross section of the breaking initiation line formed in the metal cover;
  • the figure 3 represents, schematically, a developed of the longitudinal section of one of the upstream portions of the rupture initiation line formed in the metal lid, showing the evolution of its residual thickness over its length;
  • the figure 4 schematically illustrates the tool for keeping the breaking initiation line according to the invention in the metal cover;
  • the figure 5 schematically represents the incision profile of the upper body of the incision tool according to the figure 4 , adapted to provide a breaking initiation line according to the figure 3 ;
  • the Figures 6 to 12 each represent, schematically, a developed of the longitudinal section of an alternative embodiment of an upstream portion of the breakaway line formed in the metal cover, showing the variation of its residual thickness over its length.

Le couvercle métallique 1, représenté sur la figure 1, est destiné à être assemblé sur la bordure supérieure d'un corps de contenant métallique (non représenté).The metal cover 1, shown on the figure 1 , is intended to be assembled on the upper edge of a metal container body (not shown).

Ce corps de contenant se compose généralement d'un fond associé avec la bordure inférieure d'une ceinture de parois latérales (à section circulaire, carrée, rectangulaire, etc.).This container body generally consists of a bottom associated with the lower edge of a sidewall belt (circular section, square, rectangular, etc.).

La liaison entre le couvercle métallique 1 et la bordure supérieure de ce corps de contenant s'effectue de manière habituelle, par exemple par une technique de sertissage.The connection between the metal lid 1 and the upper edge of this container body is carried out in the usual manner, for example by a crimping technique.

Ce couvercle métallique 1 est du type à « ouverture facile » (ou « EOE » pour « Easy Open End »), évitant l'utilisation d'outils de type ouvre-boîtes.This metal cover 1 is of the "easy open" type (or "EOE" for "Easy Open End"), avoiding the use of tools such as openers.

A cet effet, ce couvercle métallique 1 se compose, de manière classique, de deux parties :

  • une partie centrale 2 formant un panneau central d'obturation, et
  • une partie périphérique 3, adaptée à être solidarisée avec le corps de contenant.
For this purpose, this metal cover 1 consists, in a conventional manner, of two parts:
  • a central portion 2 forming a central shutter panel, and
  • a peripheral portion 3, adapted to be secured to the container body.

Ce couvercle métallique 1 est avantageusement réalisé monobloc par une technique d'emboutissage, cela à partir d'une tôle en matériau métallique (avantageusement aluminium, acier, etc.).This metal cover 1 is advantageously made monobloc by a stamping technique, that from a sheet metal material (preferably aluminum, steel, etc.).

La partie périphérique 3 est ici de forme annulaire ou en forme de bague. Elle est adaptée pour la fixation du couvercle métallique 1, avantageusement par sertissage, sur la bordure supérieure d'un corps de contenant comportant une paroi latérale cylindrique.The peripheral portion 3 is here ring-shaped or ring-shaped. It is adapted for fixing the metal cover 1, advantageously by crimping, on the upper edge of a container body having a cylindrical side wall.

De manière alternative, la partie périphérique 3 peut présenter toute autre forme (par exemple carré, rectangulaire), qui serait adaptée à la section du corps de contenant (le cas échéant parallélépipédique).Alternatively, the peripheral portion 3 may have any other shape (for example square, rectangular), which would be adapted to the section of the container body (if any parallelepipedic).

La partie centrale 2 comporte deux faces (figure 2) :

  • une face supérieure 21, destinée à être orientée vers l'extérieur du contenant obtenu, et
  • une face inférieure 22, destinée à être orientée vers l'intérieur du contenant, en regard du fond de ce contenant.
The central part 2 has two faces ( figure 2 ):
  • an upper face 21 intended to be oriented towards the outside of the container obtained, and
  • a lower face 22, intended to be oriented towards the inside of the container, opposite the bottom of this container.

La distance entre ces deux faces 21, 22 correspond à l'épaisseur nominale N de la partie centrale 2 (figure 2).The distance between these two faces 21, 22 corresponds to the nominal thickness N of the central portion 2 ( figure 2 ).

Cette épaisseur nominale N de la partie centrale 2 est par exemple comprise entre 0,14 et 0,28 mm, de préférence entre 0,16 et 0,25 mm.This nominal thickness N of the central portion 2 is for example between 0.14 and 0.28 mm, preferably between 0.16 and 0.25 mm.

La partie centrale 2 comprend une partie amovible 4 destinée à constituer l'ouverture d'accès au contenu du contenant.The central portion 2 comprises a removable portion 4 intended to constitute the access opening to the contents of the container.

La partie amovible 4 est, d'une part, délimitée par une ligne d'amorce de rupture 5, dite encore « ligne d'incision » et, d'autre part, équipée d'un organe d'ouverture 6.The removable part 4 is, on the one hand, delimited by a breaking initiation line 5, also called "incision line" and, on the other hand, equipped with an opening member 6.

L'organe d'ouverture 6 est ménagé au niveau de la face supérieure 21 de la partie centrale 2, recouvrant la partie amovible 4 (figure 1).The opening member 6 is formed at the upper face 21 of the central part 2, covering the removable part 4 ( figure 1 ).

La manipulation de cet organe d'ouverture 6 par un utilisateur va permettre une ouverture facile du couvercle métallique 1, c'est-à-dire une désolidarisation, totale ou partielle, de la partie amovible 4 par déchirure de la ligne d'amorce de rupture 5.The manipulation of this opening member 6 by a user will allow easy opening of the metal cover 1, that is to say a total or partial disengagement, the removable part 4 by tearing the primer line of rupture 5.

Cet organe d'ouverture 6, bien connu, est rencontré également sous l'appellation d'« anneau d'ouverture ».This opening member 6, which is well known, is also known by the name of "opening ring".

Cet organe d'ouverture 6 comporte classiquement trois parties, agencées successivement selon un axe longitudinal 6', à savoir :

  • une partie périphérique 7, communément dénommée « bec », agencée au niveau de la ligne d'amorce de rupture 5 pour réaliser l'incision dans cette dernière,
  • une partie intermédiaire 8, pour sa solidarisation avec la partie amovible 4 du couvercle métallique 1, par exemple au moyen d'une structure en forme de rivet, et
  • une partie centrale 9, formant une boucle de préhension, qui est plaquée à l'origine contre la face supérieure 21 de la partie centrale 2 du couvercle métallique 1.
This opening member 6 conventionally comprises three parts, successively arranged along a longitudinal axis 6 ', namely:
  • a peripheral portion 7, commonly called "beak", arranged at the level of the breaking initiation line 5 to make the incision in the latter,
  • an intermediate portion 8, for its attachment to the removable portion 4 of the metal cover 1, for example by means of a rivet-shaped structure, and
  • a central portion 9, forming a gripping loop, which is originally pressed against the upper face 21 of the central portion 2 of the metal cover 1.

De son côté, la ligne d'amorce de rupture 5 consiste en un amincissement de matière, constituant une structure de moindre résistance.For its part, the breaking initiation line 5 consists of a thinning of material, constituting a structure of lesser resistance.

Cette ligne d'amorce de rupture 5 est ici complète (fermée), et avantageusement de forme circulaire (figure 1). De manière alternative, elle pourrait être partielle (par exemple en arc de cercle) et/ou présenter toute autre forme (carré, rectangulaire par exemple).This line of initiation of rupture 5 is here complete (closed), and advantageously of circular form ( figure 1 ). Alternatively, it could be partial (for example in an arc) and / or have any other shape (square, rectangular for example).

Tel que représenté sur la figure 2, cette ligne d'amorce de rupture 5 comporte une épaisseur résiduelle E qui correspond à la distance minimale mesurée entre :

  • une surface supérieure 51 de la ligne d'amorce de rupture 5, du côté de la face supérieure 21 de la partie centrale 2, et
  • une surface inférieure 52 de la ligne d'amorce de rupture 5, du côté de la face inférieure 22 de la partie centrale 2.
As shown on the figure 2 this breaking initiation line 5 has a residual thickness E which corresponds to the minimum distance measured between:
  • an upper surface 51 of the breaking initiation line 5, on the side of the upper face 21 of the central portion 2, and
  • a lower surface 52 of the breaking initiation line 5, on the side of the lower face 22 of the central portion 2.

Tel que représenté encore sur la figure 2, la surface supérieure 51 de cette ligne d'amorce de rupture 5 est formée par une rainure supérieure 53 ménagée dans la face supérieure 21 de la partie centrale 2.As shown again on the figure 2 , the upper surface 51 of this breaking initiation line 5 is formed by an upper groove 53 formed in the upper face 21 of the central portion 2.

Cette ligne d'amorce de rupture 5 pourrait également être formée, de manière alternative ou complémentaire, par une rainure 54 qui serait ménagée dans la face inférieure 22 de la partie centrale 2 (comme illustré schématiquement sur la figure 2 en traits discontinus). Le cas échéant, cette rainure inférieure 54 forme alors la surface inférieure 52 de la ligne d'amorce de rupture 5.This breaking initiation line 5 could also be formed, alternately or additionally, by a groove 54 which would be formed in the lower face 22 of the central portion 2 (as schematically illustrated in FIG. figure 2 in broken lines). Where appropriate, this lower groove 54 then forms the lower surface 52 of the breaking initiation line 5.

Tenant compte de l'agencement de l'organe d'ouverture 6 et de sa manoeuvre à l'ouverture du couvercle 1, la ligne d'amorce de rupture 5 comprend différentes portions, à savoir :

  • deux portions amont 55, destinées à être déchirées par la manoeuvre en pivotement initial de l'organe d'ouverture 6, et
  • une portion aval 56 constituée par la longueur restante de la ligne d'amorce de rupture 5, destinée à être déchirée par la manoeuvre suivante en traction sur l'organe d'ouverture 6 pivoté.
Taking into account the arrangement of the opening member 6 and its operation when opening the cover 1, the breaking initiation line 5 comprises different portions, namely:
  • two upstream portions 55, intended to be torn by the operation in initial pivoting of the opening member 6, and
  • a downstream portion 56 constituted by the remaining length of the breaking initiation line 5, intended to be torn by the following maneuver in traction on the opening member 6 pivoted.

Les deux portions amont 55 s'étendent de part et d'autre de l'axe longitudinal 6' de l'organe d'ouverture 6.The two upstream portions 55 extend on either side of the longitudinal axis 6 'of the opening member 6.

Chaque portion amont 55, d'une part, et la portion aval 56, d'autre part, sont ici séparées par un axe virtuel 10 représenté sur la figure 1.Each upstream portion 55, on the one hand, and the downstream portion 56, on the other hand, are here separated by a virtual axis 10 represented on the figure 1 .

L'axe virtuel 10 correspond, au moins approximativement, à la ligne de pliage générée sur la partie amovible 4 suite au pivotement de l'organe d'ouverture 6.The virtual axis 10 corresponds, at least approximately, to the fold line generated on the removable part 4 following the pivoting of the opening member 6.

En l'espèce, cet axe virtuel 10 s'étend perpendiculairement à l'axe longitudinal 6' de l'organe d'ouverture 6.In this case, this virtual axis 10 extends perpendicularly to the longitudinal axis 6 'of the opening member 6.

Cet axe virtuel 10 passe avantageusement, au moins approximativement, au niveau de la partie de fixation 8.This virtual axis 10 advantageously passes, at least approximately, at the level of the fixing portion 8.

Par « approximativement », on entend ici le fait que l'axe virtuel 10 passe par exemple :

  • par la partie fixation 8, ou
  • en avant de la partie fixation 8 (entre la partie de fixation 8 et la partie périphérique « bec » 7), ou
  • en arrière de la partie fixation 8 (à distance de la partie périphérique « bec » 7).
By "approximately" is meant here the fact that the virtual axis 10 passes for example:
  • by the fixing part 8, or
  • in front of the fastening portion 8 (between the fastening portion 8 and the peripheral portion "beak" 7), or
  • behind the fixing part 8 (away from the peripheral part "beak" 7).

En d'autres termes, chaque portion amont 55 s'étend entre deux points (figure 1) :

  • un point initial A situé sur l'axe longitudinal 6' de l'organe d'ouverture 6, et
  • un point terminal B défini par l'axe virtuel 10 précité.
In other words, each upstream portion 55 extends between two points ( figure 1 ):
  • an initial point A located on the longitudinal axis 6 'of the opening member 6, and
  • a terminal point B defined by the aforementioned virtual axis 10.

Conformément à l'invention, pour maitriser la première phase de l'ouverture de la partie amovible 4 (correspondant au pivotement de l'organe d'ouverture 6), chaque portion amont 55 de la ligne d'amorce de rupture 5 comporte, sur sa longueur, une évolution spécifique de son épaisseur résiduelle E.According to the invention, in order to control the first phase of the opening of the removable part 4 (corresponding to the pivoting of the opening member 6), each upstream portion 55 of the breaking initiation line 5 comprises, on its length, a specific evolution of its residual thickness E.

En l'espèce, comme illustré sur la figure 3, chaque portion amont 55 de la ligne d'amorce de rupture 5 comporte trois tronçons successifs, à savoir dans le sens de déchirure (depuis le point initial A vers le point terminal B) :

  • un premier tronçon 551, comportant une épaisseur résiduelle E1 sur une longueur L1,
  • un second tronçon 552, comportant une épaisseur résiduelle E2 sur une longueur L2, et
  • un troisième tronçon 553, comportant une épaisseur résiduelle E3 sur une longueur L3.
In this case, as illustrated on the figure 3 each upstream portion 55 of the breaking initiation line 5 comprises three successive sections, namely in the tearing direction (from the initial point A to the end point B ):
  • a first section 551 having a residual thickness E1 over a length L1 ,
  • a second section 552, having a residual thickness E2 over a length L2 , and
  • a third section 553, having a residual thickness E3 over a length L3 .

La rainure supérieure 53 et/ou la rainure inférieure 54 ont ainsi une profondeur variable au niveau de chaque portion amont 55 de la ligne d'amorce de rupture 5 pour définir cette épaisseur résiduelle E variable.The upper groove 53 and / or the lower groove 54 thus have a variable depth at each upstream portion 55 of the breaking initiation line 5 to define this residual thickness E variable.

En l'espèce, les différents tronçons 551, 552 et 553 de la portion amont 55 forment chacun un palier. Chaque tronçon 551, 552 et 553 de la portion amont 55 comporte ainsi une épaisseur résiduelle E1, E2, E3, respectivement, constante sur sa longueur L1, L2, L3.In this case, the different sections 551, 552 and 553 of the upstream portion 55 each form a bearing. Each section 551, 552 and 553 of the upstream portion 55 thus has a residual thickness E1 , E2 , E3 , respectively, constant along its length L1 , L2 , L3 .

Selon l'invention, l'épaisseur résiduelle E2 du deuxième tronçon 552 est supérieure à l'épaisseur résiduelle E1, E3 du premier tronçon 551 et du troisième tronçon 553, respectivement.According to the invention, the residual thickness E2 of the second section 552 is greater than the residual thickness E1 , E3 of the first section 551 and the third section 553, respectively.

Le premier tronçon 551 et le troisième tronçon 553 de la portion amont 55 présentent en plus des épaisseurs résiduelles E1, E3 identiques l'une par rapport à l'autre.The first section 551 and the third section 553 of the upstream portion 55 additionally have residual thicknesses E1 , E3 that are identical relative to one another.

L'épaisseur résiduelle E1, E3 de ces premier tronçon 551 et troisième tronçon 553 est avantageusement identique, ou au moins approximativement identique, à l'épaisseur résiduelle majoritaire E4 de la portion aval 56.The residual thickness E1 , E3 of these first section 551 and third section 553 is advantageously identical, or at least approximately identical, to the majority residual thickness E4 of the downstream portion 56.

Par « épaisseur résiduelle majoritaire », on entend en particulier l'épaisseur résiduelle E4 de la portion aval 56 sur toute sa longueur ou quasiment toute sa longueur, à l'exclusion d'éventuels tronçons ponctuels comportant une variation d'épaisseur résiduelle E visant à maitriser sa déchirure.By "majority residual thickness" is meant in particular the residual thickness E4 of the downstream portion 56 over its entire length or practically its entire length, excluding any point segments having a residual thickness variation E aimed at master his tear.

Par exemple, le premier tronçon 551 et le troisième tronçon 553 de la portion amont 55 présentent des épaisseurs résiduelles E1, E3 comprises entre 45 et 80 µm pour des couvercles métalliques en acier.For example, the first section 551 and the third section 553 of the upstream portion 55 have residual thicknesses E1 , E3 of between 45 and 80 μm for steel metal covers.

L'épaisseur résiduelle E2 du second tronçon 552 comporte une épaisseur résiduelle supplémentaire E2', par rapport à l'épaisseur résiduelle E1, E3 du premier tronçon 551 et du troisième tronçon 553.The residual thickness E2 of the second section 552 comprises an additional residual thickness E2 ' , with respect to the residual thickness E1 , E3 of the first section 551 and the third section 553.

Par exemple, cette épaisseur résiduelle supplémentaire E2' est comprise entre 10 et 50 µm, de préférence entre 15 et 35 µm.For example, this additional residual thickness E2 ' is between 10 and 50 μm, preferably between 15 and 35 μm.

En outre, le second tronçon 552 s'étend sur une longueur L2 correspondant à au moins 20%, de préférence au moins 25%, de préférence encore entre 25 et 60 %, de la longueur L de cette portion amont 55.In addition, the second section 552 extends over a length L2 corresponding to at least 20%, preferably at least 25%, more preferably 25% to 60%, of the length L of this upstream portion 55.

Plus précisément, le second tronçon 552 de la portion amont 55 se termine par :

  • une extrémité amont 5521, du côté du point initial A et raccordée au premier tronçon 551, et
  • une extrémité aval 5522, du côté du point terminal B et raccordée au troisième tronçon 553.
More precisely, the second section 552 of the upstream portion 55 ends with:
  • an upstream end 5521, on the initial point A side and connected to the first section 551, and
  • a downstream end 5522, on the end point B side and connected to the third section 553.

L'extrémité amont 5521 se situe avantageusement à distance du point initial A.The upstream end 5521 is advantageously located at a distance from the initial point A.

L'extrémité aval 5522 est ménagée ici au sein de la portion amont 55, à distance du point terminal B.The downstream end 5522 is formed here within the upstream portion 55, away from the end point B.

De manière alternative, cette extrémité aval 5522 du second tronçon 552 pourrait se situer au niveau du point terminal B de la portion amont 55, raccordée directement avec une extrémité de la portion aval 56 de la ligne d'amorce de rupture 5.Alternatively, this downstream end 5522 of the second section 552 could be located at the end point B of the upstream portion 55, connected directly with one end of the downstream portion 56 of the breaking initiation line 5.

L'extrémité amont 5521 et l'extrémité aval 5522 consistent ici en une variation brusque de l'épaisseur résiduelle.The upstream end 5521 and the downstream end 5522 here consist of a sudden change in the residual thickness.

Ces extrémités amont 5521 et aval 5522 s'étendent ainsi perpendiculairement par rapport, d'une part, au second tronçon 552 et, d'autre part, au premier ou au troisième tronçon 551 et 553 associé.These upstream ends 5521 and downstream 5522 thus extend perpendicularly with respect, on the one hand, to the second section 552 and, on the other hand, to the first or third section 551 and 553 associated.

Uniquement à titre d'exemple, pour un couvercle métallique 1 pourvu d'une ligne d'amorce de rupture 5 dont le diamètre est d'environ 77 mm :

  • la longueur L de chaque portion amont 55 est comprise entre 15 mm et 35 mm, et
  • la longueur L2 du second tronçon 552 est avantageusement comprise entre 6 et 20 mm.
Only by way of example, for a metal cover 1 provided with a breaking initiation line 5 whose diameter is about 77 mm:
  • the length L of each upstream portion 55 is between 15 mm and 35 mm, and
  • the length L2 of the second section 552 is advantageously between 6 and 20 mm.

Encore par exemple, l'extrémité amont 5521 du second tronçon 552 se situe avantageusement à une distance comprise entre 3 et 8 mm par rapport au point initial A de la portion amont 55 (correspondant à la longueur L1 du premier tronçon 551).For example, the upstream end 5521 of the second section 552 is advantageously at a distance of between 3 and 8 mm from the initial point A of the upstream portion 55 (corresponding to the length L1 of the first section 551).

De manière générale, les deux portions amont 55 de la ligne d'amorce de rupture 5 s'étendent avantageusement symétriquement de part et d'autre de l'axe longitudinal 6' de l'organe d'ouverture 6.In general, the two upstream portions 55 of the breaking initiation line 5 advantageously extend symmetrically on either side of the longitudinal axis 6 'of the opening member 6.

En pratique, pour l'ouverture, l'utilisateur manoeuvre l'organe d'ouverture 6 selon deux opérations successives et distinctes.In practice, for opening, the user operates the opening member 6 in two successive and distinct operations.

Tout d'abord, dans une première étape d'amorce de l'ouverture, l'utilisateur saisit l'organe d'ouverture 6, en général par sa partie centrale de préhension 9, puis il l'écarte de la partie centrale 2.Firstly, in a first step of initiating the opening, the user grasps the opening member 6, generally by its central gripping portion 9, and then moves it away from the central portion 2.

L'organe d'ouverture 6 forme alors un levier, dont la partie périphérique d'incision 7 en forme de bec provoque une cassure locale de la ligne d'amorce de rupture 5, au sein du premier tronçon 551 des deux portions amont 55.The opening member 6 then forms a lever, the incision-shaped peripheral portion 7 in the form of a beak causes a local break of the breaking initiation line 5, within the first section 551 of the two upstream portions 55.

Cette déchirure se propage le long des deux portions amont 55, de part et d'autre de l'axe longitudinal 6' de l'organe d'ouverture 6, en direction de leurs points terminaux B respectifs.This tear propagates along the two upstream portions 55, on either side of the longitudinal axis 6 'of the opening member 6, towards their respective end points B.

La déchirure se poursuit alors au sein des deux seconds tronçons 552 des portions amont 55, de manière progressive et à un niveau d'effort plus important.The tear then continues within the second two sections 552 of the upstream portions 55, in a progressive manner and at a greater level of effort.

Ce mécanisme permet un ralentissement de la vitesse d'ouverture, au cours de laquelle un équilibrage de la pression s'effectue entre l'intérieur du contenant et l'environnement, cela sans risque d'affaissement du couvercle.This mechanism allows a slowing of the opening speed, during which a pressure equalization is carried out between the interior of the container and the environment, without risk of collapse of the lid.

Un tel ralentissement évite tout phénomène d'arrêt dans la déchirure de la ligne d'amorce de rupture 5. On évite ainsi un effort supplémentaire susceptible de générer une rupture intempestive en dehors de la ligne d'amorce de rupture.Such a slowdown avoids any stopping phenomenon in the tearing of the breaking initiation line 5. This avoids an additional effort likely to generate an untimely break outside the breaking initiation line.

Ce ralentissement est notamment permis par un niveau de force et d'énergie augmentant progressivement, cela sur une longueur significative des portions amont 55, pour rompre leurs seconds tronçons 552.This slowing down is in particular allowed by a progressively increasing level of force and energy over a significant length of upstream portions 55 to break their second sections 552.

Le pivotement de l'organe d'ouverture 6 se poursuit jusqu'à déchirure totale ou partielle des portions amont 55 de la ligne d'amorce de rupture 5, idéalement jusqu'au point terminal B.The pivoting of the opening member 6 continues until total or partial tearing of the upstream portions 55 of the breaking initiation line 5, ideally to the end point B.

La partie amovible 4 du couvercle 1 est alors pliée localement vers l'intérieur, selon l'axe virtuel 10.The removable part 4 of the cover 1 is then folded locally inwards along the virtual axis 10.

Dans une seconde étape d'ouverture, de manière classique, l'utilisateur exerce une traction sur l'organe d'ouverture 6 de sorte à poursuivre la déchirure de la ligne d'amorce de rupture 5, en particulier sa portion aval 56, et à dissocier tout ou partie de la partie amovible 4 par rapport au couvercle 1.In a second opening step, in a conventional manner, the user pulls on the opening member 6 so as to continue the tearing of the breaking initiation line 5, in particular its downstream portion 56, and to dissociate all or part of the removable part 4 with respect to the lid 1.

Un couvercle métallique 1 selon l'invention peut être obtenu au travers d'un procédé comprenant une étape d'incision de la ligne d'amorce de rupture 5 dans le couvercle 1, au moyen d'un outil d'incision 12 tel que représenté schématiquement sur la figure 4.A metal cover 1 according to the invention can be obtained through a method comprising a step of incising the breaking initiation line 5 in the cover 1, by means of an incising tool 12 as represented schematically on the figure 4 .

Un tel outil d'incision 12 comprend un organe supérieur 121, par exemple un bloc d'incision, et un organe inférieur 122, par exemple une enclume.Such an incision tool 12 comprises an upper member 121, for example an incision block, and a lower member 122, for example an anvil.

L'organe supérieur 121 et l'organe inférieur 122 comportent des profils 1211 et 1221 en regard, pour définir la section de la ligne d'amorce de rupture 5.The upper member 121 and the lower member 122 have profiles 1211 and 1221 facing each other, to define the section of the breaking initiation line 5.

La géométrie du profil 1211, 1221 du bloc d'incision 121 et/ou de l'enclume 122 intervient sur l'épaisseur résiduelle E de la ligne d'amorce de rupture 5.The geometry of the profile 1211, 1221 of the incision block 121 and / or of the anvil 122 acts on the residual thickness E of the breaking initiation line 5.

En particulier, le profil 1211 de l'organe supérieur 121 constitue un profil d'incision, destiné à conformer la rainure supérieure 53 de la ligne d'amorce de rupture 5.In particular, the profile 1211 of the upper member 121 constitutes an incision profile intended to conform the upper groove 53 of the breaking initiation line 5.

En l'espèce, tel que représenté sur la figure 5, le profil d'incision 1211 de l'organe supérieur 121 comporte un profil complémentaire de celui de la de chaque portion amont 55, avec en particulier une réservation 1212 destinée à définir le second tronçon 552 de la ligne d'amorce de rupture 5.In this case, as shown on the figure 5 , the incision profile 1211 of the upper member 121 has a profile complementary to that of the each of upstream portion 55, with in particular a reservation 1212 intended to define the second section 552 of the breaking initiation line 5.

En pratique, le procédé pour la fabrication d'un couvercle 1 selon l'invention comprend tout d'abord la fourniture d'un couvercle à inciser.In practice, the method for manufacturing a lid 1 according to the invention firstly comprises the provision of a lid to be incised.

Ensuite l'étape d'incision de la ligne d'amorce de rupture 5 s'effectue au moyen de l'outil d'incision 12 décrit ci-dessus.Then the incision step of the breaking initiation line 5 is performed by means of the incision tool 12 described above.

Pour cela, lors de cette étape d'incision, les profils 1211, 1221 dudit outil d'incision 121 sont rapprochés par un mouvement de translation, pour générer les rainures supérieure 53 et/ou inférieure 54 dans la partie centrale 2 du couvercle 1.For this, during this incising step, the profiles 1211, 1221 of said incision tool 121 are brought together by a translation movement, to generate the upper and / or lower grooves 54 in the central part 2 of the cover 1.

En position d'incision, les profils 1211, 1221 définissent ainsi, entre eux, un espace d'une largeur variable sur le longueur desdits profils, qui est complémentaire de l'épaisseur résiduelle E de la ligne d'amorce de rupture 5, pour générer notamment les tronçons 551, 552 et 553 des portions amont 55 de la ligne d'amorce de rupture 5.In the incision position, the profiles 1211, 1221 thus define, between them, a space of variable width along the length of said profiles, which is complementary to the residual thickness E of the breaking initiation line 5, for generate in particular the sections 551, 552 and 553 of the upstream portions 55 of the breaking initiation line 5.

Les figures 6 à 12 illustrent des variantes de réalisation pour les portions amont 55 de la ligne d'amorce de rupture 5.The Figures 6 to 12 illustrate alternative embodiments for the upstream portions 55 of the breaking initiation line 5.

Dans chacune de ces variantes, on retrouve les trois tronçons successifs 551, 552 et 553 de la portion amont 55, avec le second tronçon 552 comportant une épaisseur résiduelle E2 supérieure par rapport aux autres tronçons 551 et 553.In each of these variants, there are the three successive sections 551, 552 and 553 of the upstream portion 55, with the second section 552 having a residual thickness E2 greater than the other sections 551 and 553.

Les variantes des figures 6 et 7 se distinguent de la structure décrite ci-dessus en relation avec les figures 1 à 3, par la structure des extrémités amont 5521 et aval 5522 du second tronçon 552.Variants of Figures 6 and 7 differ from the structure described above in relation to the Figures 1 to 3 by the structure of the upstream ends 5521 and downstream 5522 of the second section 552.

Sur la figure 6, ces extrémités amont 5521 et aval 5522 constituent une variation progressive continue de l'épaisseur résiduelle E.On the figure 6 these upstream ends 5521 and downstream 5522 constitute a continuous progressive variation of the residual thickness E.

En l'occurrence, ces extrémités 5521, 5522 consistent en des pentes droites, respectivement montante et descendante.In this case, these ends 5521, 5522 consist of straight slopes, respectively upward and downward.

Par exemple, cette variation d'épaisseur s'effectue sur une longueur comprise entre 0,3 et 0,7 mm.For example, this variation in thickness takes place over a length of between 0.3 and 0.7 mm.

De préférence, l'extrémité aval 5522 s'étend sur une longueur supérieure par rapport à la longueur de l'extrémité amont 5521.Preferably, the downstream end 5522 extends over a longer length than the length of the upstream end 5521.

Cette caractéristique structurelle a pour avantage d'adoucir la variation d'effort ressentie par le consommateur.This structural characteristic has the advantage of softening the variation of effort felt by the consumer.

Sur la figure 7, l'extrémité amont 5521 comporte une variation progressive discontinue de l'épaisseur résiduelle E.On the figure 7 the upstream end 5521 has a discontinuous gradual variation of the residual thickness E.

En l'espèce, cette extrémité amont 5521 a la forme d'un escalier ou d'une succession de paliers.In this case, this upstream end 5521 has the shape of a staircase or a succession of bearings.

Cette caractéristique structurelle a également pour avantage d'adoucir la variation d'effort ressentie par le consommateur.This structural characteristic also has the advantage of softening the variation of effort felt by the consumer.

Les variantes des figures 8 à 12 se distinguent de la structure décrite ci-dessus en relation avec les figures 1 à 3, par une épaisseur résiduelle E2 variable du second tronçon 552.Variants of Figures 8 to 12 differ from the structure described above in relation to the Figures 1 to 3 by a residual thickness E2 variable of the second section 552.

Dans ce cas, l'épaisseur résiduelle supplémentaire E2' correspond à l'épaisseur résiduelle maximale de ce second tronçon 552.In this case, the additional residual thickness E2 ' corresponds to the maximum residual thickness of this second section 552.

Sur la figure 8, le second tronçon 552 comporte une variation progressive continue de l'épaisseur résiduelle E2, avec une pente linéaire croissante supérieure à une pente linéaire décroissante.On the figure 8 the second section 552 comprises a continuous progressive variation of the residual thickness E2 , with an increasing linear slope greater than a decreasing linear slope.

Sur la figure 9, le second tronçon 552 comporte une variation progressive continue de l'épaisseur résiduelle E2, avec une pente linéaire croissante identique, ou au moins approximativement identique, à la pente linéaire décroissante.On the figure 9 the second section 552 comprises a continuous progressive variation of the residual thickness E2 , with an increasing linear slope that is identical, or at least approximately identical, to the decreasing linear slope.

Sur la figure 10, le second tronçon 552 comporte une variation d'épaisseur courbe, par exemple en arc de cercle.On the figure 10 the second section 552 has a variation of curved thickness, for example in an arc.

Sur les figures 11 et 12, le second tronçon 552 comporte une variation d'épaisseur de forme générale oscillante, brisée sur la figure 11 et courbe sur la figure 12.On the Figures 11 and 12 , the second section 552 has a thickness variation of generally oscillating shape, broken on the figure 11 and curve on the figure 12 .

Dans ces modes de réalisation selon les figures 11 et 12, l'épaisseur résiduelle E2 du second tronçon 552 oscille entre une valeur minimale E21 et une valeur maximale E22 qui restent toutes deux supérieures à l'épaisseur résiduelle E1, E3 des premier et troisième tronçons 551, 553.In these embodiments according to Figures 11 and 12 , the residual thickness E2 of the second section 552 oscillates between a minimum value E21 and a maximum value E22 which both remain greater than the residual thickness E1 , E3 of the first and third sections 551, 553.

De manière générale, la structure de couvercle selon l'invention a pour intérêt de préserver une facilité d'ouverture, tout en offrant une solution efficace au risque d'implosion à l'ouverture et au risque de déchirure de la partie amovible du fait de son sens de laminage.In general, the lid structure according to the invention has the advantage of preserving an ease of opening, while offering an effective solution to the risk of implosion at the opening and the risk of tearing of the removable part due to its rolling direction.

La structure de couvercle selon l'invention permet, pour une même épaisseur de couvercle et de ligne d'amorce de rupture, une résistance accrue à l'implosion par rapport à un système du type « arrester flat ».The cover structure according to the invention makes it possible, for the same thickness of the cover and of the breaking initiation line, to have an increased resistance to implosion compared to a system of the "flat arrester" type.

Claims (12)

  1. A metal cover for a container body, in particular for a container of the metal can type, said metal cover (1) comprising:
    - a central part (2) forming a central closing panel, and
    - a peripheral part (3) adapted to be fastened to said container body,
    wherein the central part (2) comprises a removable part (4) that is delimited by a scoreline (5) having a variable residual thickness and that is equipped with an opening member (6),
    wherein the opening member (6) comprises, on either side of a part (8) for the fastening to the removable part (4), a peripheral incision part (7) and a central grasping part (9),
    wherein said scoreline (5) comprises:
    - two upstream portions (55), extending on either side of the longitudinal axis (6') of the opening member (6), and
    - a downstream portion (56), consisted by the remaining length of said scoreline (5), wherein the portions (55, 56) are arranged on either side of a virtual axis (10) extending perpendicularly to the longitudinal axis (6') of the opening member (6), said virtual axis (10) corresponding to the bend line generated on the removable part (4) after a pivoting of said opening member (6) and the tearing of said upstream portions (55),
    characterized in that each upstream portion (55) of the scoreline (5) includes, successively in the tearing direction, at least two sections:
    - a first section (551) having a first residual thickness (E1), and
    - a second section (552) having a residual thickness (E2) higher than said first residual thickness (E1),
    wherein the second section (552) extends over at least 20 % of the length (L) of said upstream portion (55),
    and in that said second section (552) of each upstream portion (55) of the scoreline (5) includes:
    - an upstream end (5521), connected to the first section (551), and
    - a downstream end (5522), provided within said upstream portion (55).
  2. The metal cover according to claim 1, characterized in that the downstream end (5522) of the second section (552) is connected to the downstream portion (56) (i) directly or (ii) through a third section (553) whose residual thickness (E3) is lower than the residual thickness (E2) of said second section (552) of the upstream portion (55).
  3. The metal cover according to any one of the claims 1 or 2, characterized in that the upstream end (5521) and/or the downstream end (5522) of the second section (552) of the upstream portion (55) show:
    - an abrupt variation of the residual thickness, or
    - a continuous progressive variation of the residual thickness, or
    - a discontinuous progressive variation of the residual thickness.
  4. The metal cover according to claim 3, characterized in that the upstream end (5521) and the downstream end (5522) of the second section (552) of the upstream portion (55) each show a progressive variation of the residual thickness (E), and in that the downstream end (5522) extends over a length higher than the length of the upstream end (5521).
  5. The metal cover according to any one of claims 1 to 4, characterized in that the first section (551) of the upstream portion (55) of the scoreline (5) has a constant residual thickness (E1), and
    in that the second section (552) of the upstream portion (55) of the scoreline (5) has a constant or variable residual thickness (E2).
  6. The metal cover according to any one of claims 1 to 5, characterized in that the difference of residual thickness (E2') between the first section (551) and the second section (552) of the upstream portion (55) is comprised between 10 and 50 µm.
  7. The metal cover according to any one of claims 1 to 6, characterized in that the first section (551), and as the case may be, the third section (553), of the upstream portion (55) has a residual thickness identical, or at least approximately identical, to the majority residual thickness (E4) of the downstream portion (56).
  8. The metal cover according to any one of claims 1 to 7, characterized in that the scoreline (5) is formed by a lower groove (54) and/or by an upper groove (53) that are arranged in a lower face (22) and/or an upper face (21), respectively, of the central part (4) of the cover (1), and
    in that said upper groove (53) and/or said lower groove (54) have a variable depth at the upstream portion (55) of the scoreline (5).
  9. The metal cover according to any one of claims 1 to 8, characterized in that the upstream portions (55) of the scoreline (5) extend symmetrically on either side of the longitudinal axis (6') of the opening member (6).
  10. A container, in particular of the metal can type, equipped with a metal cover (1) according to any one of claims 1 to 9.
  11. A method for manufacturing a cover (1) according to any one of claims 1 to 9, wherein the method comprises a step of incision of the scoreline (5) in said cover (1), by means of an incision tool (12) comprising an upper member (121) and a lower member (122) each carrying a profile (1211, 1221),
    characterized in that, during said step of incision, the profiles (1211, 1221) of said incision tool (12) are arranged so as to generate each of said upstream portions (55) of the scoreline (5),
    each upstream portion (55) of the scoreline (5) includes, successively in the tearing direction, at least two sections:
    - a first section (551) having a first residual thickness (E1), and
    - a second section (552) having a residual thickness (E2) higher than said first residual thickness (E1),
    wherein the second section (552) extends over at least 20 % of the length (L) of said upstream portion (55),
    wherein the second section (552) of each upstream portion (55) of the scoreline (5) includes:
    - an upstream end (5521), connected to the first section (551), and
    - a downstream end (5522), provided within said upstream portion (55).
  12. A device for manufacturing a metal cover (1) according to any one of claims 1 to 9, comprising an incision tool (12) for forming the scoreline (5), which incision tool (12) comprises an upper member (121) and a lower member (122), each carrying an incision profile (1211, 1221),
    characterized in that the profiles (1211, 1221) in incision position define, between each other, a space of a variable width to generate the upstream portions (55) of the scoreline (5),
    each upstream portion (55) of the scoreline (5) includes, successively in the tearing direction, at least two sections:
    - a first section (551) having a first residual thickness (E1), and
    - a second section (552) having a residual thickness (E2) higher than said first residual thickness (E1),
    wherein the second section (552) extends over at least 20 % of the length (L) of said upstream portion (55),
    wherein the second section (552) of each upstream portion (55) of the scoreline (5) includes:
    - an upstream end (5521), connected to the first section (551), and
    - a downstream end (5522), provided within said upstream portion (55).
EP15742361.7A 2014-06-30 2015-06-29 Metal cover for a container body Active EP3160857B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15742361T PL3160857T3 (en) 2014-06-30 2015-06-29 Metal cover for a container body

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1456130A FR3022895B1 (en) 2014-06-30 2014-06-30 METAL COVER FOR A CONTAINER BODY
PCT/FR2015/051772 WO2016001562A1 (en) 2014-06-30 2015-06-29 Metal cover for a container body

Publications (2)

Publication Number Publication Date
EP3160857A1 EP3160857A1 (en) 2017-05-03
EP3160857B1 true EP3160857B1 (en) 2018-05-16

Family

ID=51417488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15742361.7A Active EP3160857B1 (en) 2014-06-30 2015-06-29 Metal cover for a container body

Country Status (12)

Country Link
US (1) US20170137168A1 (en)
EP (1) EP3160857B1 (en)
JP (1) JP2017520490A (en)
CN (1) CN106573700B (en)
AU (1) AU2015282552B2 (en)
BR (1) BR112016030868B1 (en)
ES (1) ES2682748T3 (en)
FR (1) FR3022895B1 (en)
HU (1) HUE039498T2 (en)
PL (1) PL3160857T3 (en)
RU (1) RU2676661C2 (en)
WO (1) WO2016001562A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2786187T5 (en) 2014-12-01 2024-09-24 Trivium Packaging Group Netherlands B V Closure for a container and a container provided with the same

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3291336A (en) * 1965-01-22 1966-12-13 Ermal C Fraze Can top
US3416700A (en) * 1967-10-25 1968-12-17 Continental Can Co Safety device for easy opening container ends
US4503989A (en) * 1984-02-01 1985-03-12 Ermal C. Fraze Can end with retained tear strip
AU5155298A (en) * 1996-11-20 1998-06-10 Coors Brewing Company Can end having score groove with thickened residual area
JP2000233247A (en) * 1999-02-12 2000-08-29 Nippon Steel Corp Method for manufacturing easy-open lid and lid
EP1308226A1 (en) * 2001-11-06 2003-05-07 Impress B.V. Easy opening closure, container provided with such closure, and apparatus for producing such closure
JP2004161360A (en) * 2002-11-15 2004-06-10 Daiwa Can Co Ltd Easy opening can lid
US7523954B2 (en) * 2005-01-21 2009-04-28 Graco Children's Products Inc. Collapsible stroller with foot rest
US20060237459A1 (en) * 2005-04-19 2006-10-26 Sonoco Development, Inc. Removable-panel metal end with cut protection
JP4883995B2 (en) * 2005-12-07 2012-02-22 大和製罐株式会社 Can lid with score line

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
JP2017520490A (en) 2017-07-27
BR112016030868A8 (en) 2017-08-22
EP3160857A1 (en) 2017-05-03
FR3022895A1 (en) 2016-01-01
RU2017102697A (en) 2018-07-30
RU2017102697A3 (en) 2018-11-21
CN106573700A (en) 2017-04-19
FR3022895B1 (en) 2017-08-04
US20170137168A1 (en) 2017-05-18
WO2016001562A1 (en) 2016-01-07
AU2015282552A1 (en) 2017-01-19
BR112016030868A2 (en) 2017-06-06
PL3160857T3 (en) 2018-10-31
BR112016030868B1 (en) 2022-01-11
HUE039498T2 (en) 2019-01-28
AU2015282552B2 (en) 2019-08-22
RU2676661C2 (en) 2019-01-09
ES2682748T3 (en) 2018-09-21
CN106573700B (en) 2019-04-05

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