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EP0500411B1 - Dispositif pour couper en long des bandes en matière plastique - Google Patents

Dispositif pour couper en long des bandes en matière plastique Download PDF

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Publication number
EP0500411B1
EP0500411B1 EP19920400313 EP92400313A EP0500411B1 EP 0500411 B1 EP0500411 B1 EP 0500411B1 EP 19920400313 EP19920400313 EP 19920400313 EP 92400313 A EP92400313 A EP 92400313A EP 0500411 B1 EP0500411 B1 EP 0500411B1
Authority
EP
European Patent Office
Prior art keywords
knife
cutting
web
cutting edge
edge
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.)
Expired - Lifetime
Application number
EP19920400313
Other languages
German (de)
English (en)
Other versions
EP0500411A1 (fr
Inventor
Gilles Petitjean
Jacques Gilbert De Cauwer
Luc Nicolai
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.)
Mylar Specialty Films US LP
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP0500411A1 publication Critical patent/EP0500411A1/fr
Application granted granted Critical
Publication of EP0500411B1 publication Critical patent/EP0500411B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/02—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member
    • B26D1/025—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member for thin material, e.g. for sheets, strips or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D5/02—Means for moving the cutting member into its operative position for cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting

Definitions

  • the present invention relates to a cutting device, which is particularly intended for slitting or edge trimming a web or film of plastics material that is continuously moving between first and second transfer rolls rotating about horizontal axes and which is mechanically kept under tension between the two said rolls, the device comprising a knife with a circular cutting edge mounted on a support arm (see for example FR-A-2152857).
  • a cutting device typically finds application in the continuous production of thin webs or films of plastics material, particularly where there is a requirement to eliminate the rough or irregular edges that are produced on such webs or films as a result of transverse stretching.
  • One object of the present invention is consequently to provide a cutting device in which the cutting edge of the knife has a high resistance to wear and which enables a considerable length of web or film to be cut before there is a need to replace or resharpen the knife.
  • a further object of the invention provides a cutting device which regularly distributes wear over a considerable length of the cutting edge of the knife, thus ensuring that the knife has a long working life while still ensuring that a cut which is as good, true and regular as that provided by a razor blade is obtained.
  • a further object of the invention consists in providing a cutting device which yields a cut having improved straightness such that it is no longer possible to visually distinguish the successive layers of web or film on a wound roll and which enables a roll of such material to be accurately cut into narrower elements.
  • a further object of the invention is to provide a cutting device for webs or films of plastics material which is less sensitive to clogging and wear as a result of dust and debris originating from such cutting.
  • a further object of the invention is to provide a cutting device in which the debris and waste material from cutting can easily be collected.
  • a cutting device for slitting or edge trimming a web of plastics material which is continuously moving between a first and a second transfer roll rotating about horizontal axes and which is mechanically kept under tension between said first and second transfer rolls, comprising a knife consisting of a thin disc having a sharpened circular cutting edge that is rotated slowly about an axis that is substantially parallel to the axes of said first and second transfer rolls, the direction of rotation of said disc being such that the tangential displacement of the cutting edge thereof in the region that intersects said web is in a direction which is opposite to the direction of movement of said web, characterized in that said knife, when in the cutting position, intersects from below, over a circular-shaped sector, an oblique plane inclined substantially at 45° to the horizontal formed by the web between said first and second transfer rolls, and in that the cutting edge of said knife which passes through said web rotates in the proximity of said first transfer roll during operation of said device.
  • the knife is detachably mounted on a shaft journaled at the end region of a fixed support arm, said shaft carrying a driven pulley which is driven in rotation by a continuous belt using a drive pulley linked to a drive motor means.
  • the support arm has a concave hollowed upper surface which substantially follows, in the cutting position, the contour of the first transfer roll the cutting edge of said knife reaches to a distance on the order of one millimeter to said first transfer roll.
  • the cutting edge of the knife is advantageously ground to an angle of about 45° by providing on each side thereof a bevelled annular face obtained by a tangential grinding or machining operation.
  • the invention also relates to installations for cutting or slitting weblike or film material, notably a continuously moving plastics material film, that incorporate a cutting device of the type specified herein.
  • the cutting device according to the invention is designed to slit a film or web of plastics material 2 travelling in the cutting region between first and second transfer rolls 3 and 4, the film or web moving from the upper roll 3 to the lower roll 4 as indicated by arrows f.
  • the film or web 2 may, for certain plastics materials, have a relatively large thickness of several tens of millimeters, while for other materials it may have a very small thickness of the order of only several micrometers.
  • the web or film (hereinafter referred to as the "film”) 2 is moving at high speed, which can reach several meters per second, between the first and second transfer rolls 3 and 4 in an oblique plane 5 inclined at substantially 45° with respect to the horizontal.
  • the cutting device 1 consists of a knife 6 having a circular cutting edge 6b taking the form of a thin disc which is sharpened at about 45° on its peripheral edge and is made of a suitable material such as a suitably tempered hard steel.
  • the knife 6 is mounted on axial shaft 7 which is arranged horizontally and parallel to the plane 5 of the film 2, rotating inside the end portion 8 of a holder arm 9 that is integral with a fixed frame structure which is not shown.
  • Shaft 7 has a rotatably driven, rigidly fixed toothed pulley 10, preferably mounted on the side of the support arm end 8 opposite to the knife 6 (see figure 3).
  • This driven toothed pulley 10 receives an endless toothed belt 11.
  • the belt 11 is driven by a drive pulley 12 which is mounted on a shaft 13 the axis of which is parallel to the axis of shaft 7 and is driven rotatably by a speed reduction unit 14.
  • the arm 9 can consist of two parallely aligned metal plates 8a, 8b separated by cross members which are not illustrated and which maintain the two plates spaced by a distance i substantially equal to the thickness of the disc of knife 6. Shaft 7 is thus journaled at each side of the knife disc in a respective journal bearing 16, 17 provided in each one of the plates 8a, 8b.
  • the endless belt 11 is preferably toothed but can be a thin flat belt which is retained in a flat groove as illustrated in figure 2, or alternatively a highly elastic round section belt 11b can be used, as illustrated in figure 3.
  • the systems using belts and pulleys of figures 2 and 3 are completely interchangeable.
  • the end 8 of the arm includes, a locking detent means 21 housed within the loop of the belt 11 and having a projecting tooth.
  • the locking detent means 11 is secured to an eccentric component (not shown) by any suitable means such as by screws having a central axis 20.
  • the projecting tooth after displacement of the eccentric component, engages between two adjacent teeth of the belt 11 to lock the belt axially and prevent shaft 7 from turning.
  • the direction of rotation of the speed reduction motor unit 14 is selected so that knife 6 rotates in the direction of arrow F, so that the tangential displacement of cutting edge 6b of the knife takes place in the opposite direction to that of the movement of film 2.
  • the linear velocity of rotation of the knife's circular cutting edge is small compared to the velocity of movement of the film.
  • the bearings of shaft 7, which can be radially-prestressed roller bearings, preferably deep-race ball bearings, exhibit minimal play while still allowing the knife to rotate with very limited opposition due to the low speed of rotation. This also ensures minimal increase in play with the passage of time.
  • an adequate and sealed lubrication system grease for example, can be used for the single bearing (see figure 3), or for the double bearings (figure 2).
  • Arm 9 has a generally tapered shape so that the knife 6 can be positioned when in the cutting position between the two rolls 3 and 4, the cutting edge 6b being extremely close (the spacing being shown by e in figure 1) to the first or feed roll 3.
  • the distance e can, for example, be of the order of a millimeter.
  • the upper contour of arm 9 has a concave shape 15.
  • the film 2 encounters in plane 5, the cutting edge 6b of knife 6 which is inclined with respect to this plane 5 (leading to reduction in the cutting angle) and which slits the film.
  • the knife 6 is arranged in such a manner that its cutting edge 6b intersects the plane 5 of film 2 along the line of cutting by penetrating, from below, over a circular sector 6a, through the film 2.
  • the line joining the axes of the driven and drive pulleys 10 and 12 is slightly inclined (by 10 to 30°) with respect to the horizontal to take advantage of the available 45° angle area under the plane 5 of the film for housing the end 8 of arm 9.
  • the cutting edge 6b of knife 6 has an angle x that is close to 45°. Obviously, other cutting angles are possible in order to take account, if necessary, of the nature of the material to be cut. Additionally, several manners of sharpening the cutting edge are possible.
  • a single annular bevelled face 6c making an angle x with the plane face 18 can be provided by tangential grinding of the knife 6.
  • two annular bevelled faces 6d and 6e making a respective angle of y and z with the cutting plane 19 of knife 6 can be used, the plane 19 being the plane through which the whole circular cutting edge 6b of the knife passes when there is no warp present.
  • the cutting plane 19 which is shown extended by dash-dot lines in figure 3, is a plane that is parallel to the two parallel sides 18 and 18b of the knife 6 and which passes through the cutting or slicing edge 6b (in fact the circular edge) of knife 6.
  • the angles y and z are usually substantially identical and equal to half the angle x, in other words 22.5°, which reconstructs the 45° sharpening of razor blades.
  • the angles y and z can obviously be different as a function of the material that is to be cut or slit, and the sum of the angles can differ from 45° for the same reasons.
  • the end 8 of arm 9 carries a brush or scraper means 26 to permanently clean or wipe the cutting edge 6b and the annular tapered sides 6c or 6d and 6e to remove debris adhering thereto and originating from the slitting operation.
  • Such debris 27 falls onto a plate 28 which protects roll 4 and is evacuated without any risk of interfering with slitting or bring carried along with the moving web of film 2.
  • a self-sharpening means (such as grindstones or the like) can also be provided on arm 9 for sharpening cutting edge 6b either continuously or at regular intervals, during production or during the time film 2 is not moving.
  • the cutting device according to the invention has proved to be capable of achieving remarkable service, effectively slitting in excess of a thousand kilometers of film, before resharpening is required. Resharpening can be readily done in the workshop after removing knife 6 or the entire arm 9.
  • shaft 7 is permanently mounted in the end portion 8 of arm 9 using a rolling bearing 22 that is very rigid in the radial and axial directions (for example a deep race ball bearing or a roller bearing) with sealed lubrication.
  • a rolling bearing 22 that is very rigid in the radial and axial directions (for example a deep race ball bearing or a roller bearing) with sealed lubrication.
  • the circular knife 6 is supported laterally on an annular flange bearing 23 at the point of exit of shaft 7 and an integral annular securing ring 25 having at least one screw 24 is used to secure the bearing onto shaft 7.
  • locking means 21 is first pressed against the toothed belt 11 in order to lock the belt in position and prevent shaft 7 from rotating.
  • the cutting device that has been removed is then subject to a full workshop service both as regards to the knife 6 (which is removed or resharpened), and the belt, the bearings and the speed reduction motor unit 14, all the parts being completely cleaned, checked and lubricated if necessary.
  • the cutting device provides slit film edges which are particularly tear-free and crack-free.
  • rotation of knife 6 ensures that the film is cut over the whole region that is in contact with the knife's cutting edge, unlike with conventional razor blades where the cut can become irregular.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (6)

  1. Dispositif de coupe, destiné notamment à refendre ou couper en rives un film de matière plastique (2) qui se déplace de manière continue entre un premier (3) et un second (4) cylindres de transfert tournant autour d'axes horizontaux et est maintenu sous tension mécanique entre lesdits premier et second cylindres, comprenant un couteau (6) à tranchant circulaire (6b) monté sur un bras de support (9), et consistant en un disque mince à bord circulaire affûté (6d, 6e), qui est entraîné en rotation lente autour d'un axe sensiblement parallèle aux axes desdits cylindres de transfert, le sens de rotation dudit disque étant tel que le déplacement tangentiel de son bord de coupe (6d, 6e) dans la zone qui intersecte ledit film (2) s'effectue dans une direction qui est opposée au sens de déplacement dudit film caractérisé en ce que ledit couteau (6), en position de coupe, intersecte par en-dessous, en pénétrant par un segment circulaire (6a), un plan oblique (5), incliné sensiblement à 45° par rapport à l'horizontale, que forme le film (2) entre lesdits premier et second cylindres (distance e), et en ce que le bord tranchant du couteau (6) qui traverse ledit film (2) tourne à proximité (distance e) dudit premier cylindre de transfert (3) pendant le fonctionnement dudit dispositif.
  2. Dispositif selon la revendication 1, caractérisé en ce que ledit couteau (6) est monté amovible sur un arbre (7) qui est tourillonné à l'extrémité (8) d'un bras de support fixe (9), ledit arbre (7) portant une poulie (10) entraînée en rotation, par l'intermédiaire d'une courroie continue (11), par une poulie menante (12) reliée à des moyens de moteur d'entraînement.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que ledit bras de support (9) présente une surface supérieure en évidement concave (15) suivant sensiblement, dans ladite position de coupe, le contour dudit premier cylindre de transfert (3) de manière que le bord de coupe (6b) dudit couteau (6) s'approche à une distance de l'ordre du millimètre dudit premier cylindre de transfert.
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le bord coupant (6b) dudit couteau (6) est affûté selon un angle d'environ 45°.
  5. Dispositif selon la revendication 4, dans lequel ledit bord coupant (6b) est affûté à un angle d'environ 45° par meulage ou usinage tangentiel, sur chaque face du bord coupant, d'une face annulaire d'affûtage (6d, 6e).
  6. Une installation pour la découpe ou la refente de films ou feuils (2), notamment de films plastiques défilant de manière continue, caractérisée en ce qu'elle comporte au moins un dispositif de coupe selon les revendications 1 à 5.
EP19920400313 1991-02-18 1992-02-07 Dispositif pour couper en long des bandes en matière plastique Expired - Lifetime EP0500411B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9101897A FR2672837A1 (fr) 1991-02-18 1991-02-18 Dispositif de coupe, notamment pour refendre les films de matiere plastique.
FR9101897 1991-02-18

Publications (2)

Publication Number Publication Date
EP0500411A1 EP0500411A1 (fr) 1992-08-26
EP0500411B1 true EP0500411B1 (fr) 1995-11-29

Family

ID=9409820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920400313 Expired - Lifetime EP0500411B1 (fr) 1991-02-18 1992-02-07 Dispositif pour couper en long des bandes en matière plastique

Country Status (3)

Country Link
EP (1) EP0500411B1 (fr)
DE (1) DE69206288T2 (fr)
FR (1) FR2672837A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4408075C2 (de) * 1994-03-10 1998-10-29 Roland Man Druckmasch Vorrichtung zum Längsschneiden von Bedruckstoffen in Bogen- und Rollenmaschinen
JPH1044096A (ja) * 1996-07-30 1998-02-17 Nikko Kinzoku Kk マスキングテ−プ切断装置
DE10150064B4 (de) * 2001-10-10 2016-05-25 Oerlikon Textile Gmbh & Co. Kg Verfahren und Vorrichtung zum Längsschneiden einer Folienbahn
US10350776B2 (en) 2016-05-11 2019-07-16 Zenith Cutter, Inc. Cutoff knife serration
CN119659062A (zh) * 2023-09-20 2025-03-21 宁德时代新能源科技股份有限公司 边料导出装置、辊压系统和制备电极片的方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE788741A (nl) * 1971-09-14 1973-03-13 Tno Werkwijze en inrichting voor het snijden van splijtfoelie
FI63800C (fi) * 1982-04-27 1983-08-10 Valmet Oy Foerfarande och anordning vid skaerningen av spetsen i en pappersbana

Also Published As

Publication number Publication date
EP0500411A1 (fr) 1992-08-26
FR2672837A1 (fr) 1992-08-21
DE69206288D1 (de) 1996-01-11
DE69206288T2 (de) 1996-07-18

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