WO2024223191A1 - Method for producing a closure cap for containers - Google Patents
Method for producing a closure cap for containers Download PDFInfo
- Publication number
- WO2024223191A1 WO2024223191A1 PCT/EP2024/058178 EP2024058178W WO2024223191A1 WO 2024223191 A1 WO2024223191 A1 WO 2024223191A1 EP 2024058178 W EP2024058178 W EP 2024058178W WO 2024223191 A1 WO2024223191 A1 WO 2024223191A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tool
- insert element
- axial end
- injection molding
- core
- 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.)
- Pending
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
- B29C45/14196—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being positioned around an edge of the injected part
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2616—Moulds having annular mould cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2618—Moulds having screw-threaded mould walls
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- 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
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
- B65D41/34—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt
- B65D41/3442—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with rigid bead or projections formed on the tamper element and coacting with bead or projections on the container
- B65D41/3457—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with rigid bead or projections formed on the tamper element and coacting with bead or projections on the container the tamper element being formed separately but connected to the closure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0081—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of objects with parts connected by a thin section, e.g. hinge, tear line
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
- B29L2031/565—Stoppers or lids for bottles, jars, or the like, e.g. closures for containers
Definitions
- the invention relates to a method for producing a closure cap for containers using an injection molding tool, which comprises at least one core tool and at least one jacket tool that overlaps the core tool, both of which are formed around a common central axis and which, when the injection molding tool is closed, form a volume region between them that defines the closure cap and into which molten plastic is injected.
- the invention also relates to a closure cap produced in this way.
- the injection molding tool is preferably closed in the prior art and also in the invention by the at least one core tool being introduced into the casing tool in the direction of the common center axis until these two tools assume a predetermined desired axial distance from one another.
- the opening can preferably take place in the opposite direction in the prior art and also in the invention in order to demold the closure cap produced, whereby it can be provided that the casing tool rotates about the common center axis, e.g. if a closure cap has been produced that has an internal thread and for this purpose the core tool has a corresponding thread or corresponding thread sections on its radially outward-facing casing surface.
- closure caps produced in this way can be used for a variety of different containers.
- containers e.g. made of glass or plastic, e.g. bottles or canisters, in particular those intended for chemical substances, preferably to which the invention also relates, the requirements for the closure cap are high.
- closure caps must seal the containers tightly, be sufficiently stable, especially so that they do not break if the container falls, and must protect the contents of the container from substances in the environment and also protect the environment from substances in the contents of such containers. These requirements are often not met by conventional closure caps.
- the object is achieved in that the core tool has an axial end face in which a recess surrounding the central axis is formed, and the jacket tool has a projection surrounding the central axis on its inner axial end face, wherein an insert element, preferably a flat insert element, preferably a circular disk-shaped insert element, is positioned between the two opposing axial end faces before the injection molding tool is closed, and when the injection molding tool is closed, the projection penetrates at least partially into the recess and thereby deforms the insert element, and after the injection molding tool is closed, the volume area is filled with molten plastic through a sprue opening positioned in the projection, preferably on the central axis, whereby the insert element is pressed by the plastic against the axial end face of the core tool from the direction of the jacket tool.
- an insert element preferably a flat insert element, preferably a circular disk-shaped insert element
- the closing of the injection mold is preferably carried out by a linear movement between the core tool and the outer tool, Preferably without rotation of the two tools against each other, but rotation can also be provided during closing, e.g. to bring the two tools into a desired angular position relative to each other.
- the aforementioned recess is surrounded by an annular surface, preferably a partially planar annular surface.
- the recess can preferably have a bottom surface, in particular at least partially a planar bottom surface, which is offset in the axial direction by the depth of the recess from the annular surface.
- the axial direction is generally the direction of the common center axis or parallel thereto.
- the axial, in particular inner, end face of the shell tool lies opposite the axial end face of the core tool in the closed state of the injection molding tool, forming a distance, wherein the previously not yet formed, preferably flat/level insert element lies in this distance area.
- the insert element preferably the initially flat insert element, is preformed in the direction of the final shape, in particular at least substantially preformed in the shape of a pot or bowl, in particular preformed in the sense that the insert element approaches the final shape as a result of the forming, except for the play in the distance area between the two tools.
- the procedure according to the invention ensures that the insert element is covered by plastic only on one side from the direction of the casing tool, but is exposed in the interior of the closure cap produced in this way, in particular with contact to the contents of a container which is to be closed with the closure cap.
- the recess in the axial face of the core tool is designed in such a way that in the produced cap a A projection protruding from the cap lid is formed, which axially penetrates into the interior of the container neck when the container is closed with the cap.
- a projection can thus preferably form a plug arranged on the cap lid area, which also performs a sealing function in the radial direction to the inner wall area of the container neck.
- the seal is achieved via the insert element, which covers the plug thus formed.
- the annular surface of the end face of the core tool mentioned at the beginning forms a collar in the pot- or bowl-shaped insert element, in particular a radially outer collar, which covers the annular end face of the container neck when a container is closed.
- the closure cap produced according to the invention thus has an extended sealing function compared to the prior art.
- the projection in the casing tool is preferably also designed in such a way that a recess is formed on the outside of the produced closure cap, preferably in the middle of which the sprue point is located.
- This shape design leads to increased stability of the closure cap, particularly in the cover area that covers the container neck opening, and thus also to improved tightness.
- the insert element is the only element of the closure cap that can come into contact with the contents of the container.
- the insert element can thus perform a sealing function on the one hand, but also form a diffusion barrier for the contents of the container, on the one hand against diffusion of the contents to the outside and on the other hand against diffusion of ambient substances, e.g. oxygen, to the inside of the container.
- the closure cap according to the invention thus achieves several advantages through the combination of a formed insert element with a lid region formed into an inner plug.
- the invention can provide for the closure cap to always be manufactured using the same plastic by injection molding, e.g. polyethylene (PE) or polypropylene (PP), although the invention is not limited to these plastics.
- PE polyethylene
- PP polypropylene
- the material of the insert element that comes into contact with the container contents is selected depending on the intended container contents.
- the insert element is selected from a fluoropolymer, in particular from one of the following materials: perfluoroalkoxy (PFA), ethylene-tetrafluoroethylene (ETFE), ethylene-chlorotrifluoroethylene (ECTFE), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE).
- PFA perfluoroalkoxy
- ETFE ethylene-tetrafluoroethylene
- ECTFE ethylene-chlorotrifluoroethylene
- PVDF polyvinylidene fluoride
- PTFE polytetrafluoroethylene
- the invention can provide that the insert element is selected from a material to which the plastic does not bond in a material-locking manner during injection molding, in particular according to the invention the insert element is then held in the cap exclusively in a form-fitting and/or force-fitting manner.
- a positive connection between the insert element and the injected solidified plastic is achieved in the shaping according to the invention in both axially and radially oriented surface areas of the lid area of the closure cap, in particular a positive connection of the solidified injection plastic with one of the two surfaces of the insert element that are opposite each other across the thickness of the insert element, preferably originally flat, and deformed according to the invention. Further preferably, a positive connection is also achieved between the radially outer edge surface of the originally non-formed insert element, preferably flat insert element, and the solidified injection plastic, in particular thereby preventing the insert element from peeling off the solidified injection plastic near the edge.
- the invention can preferably provide that in a possible embodiment the circular disk diameter of the insert element is selected in such a way, in particular is selected to be larger or smaller than the outer diameter of the axial end face, in particular than the outer diameter of the annular surface surrounding the recess, preferably partially planar annular surface of the axial end face of the core tool, that with the penetration of the projection into the recess and/or by pressing with the plastic, the radially outward-facing edge surface of the insert element comes to lie on the axial end face, in particular on the annular surface surrounding the recess, preferably partially planar annular surface of the axial end face.
- the insert element after the forming process is preferably located exclusively axially in front of the axial end face of the core tool, without encompassing its outer surface.
- the invention preferably provides that the circular disk diameter of the insert element is selected to be larger than the Outer diameter of the axial end face, in particular as the outer diameter of the annular surface surrounding the recess, preferably partially flat annular surface of the axial end face of the core tool, and that the core tool has an annular surface in its outer surface, over which the outer surface tapers in cross-section, in particular in the outer diameter, in the direction of the axial end face, wherein by closing the injection molding tool and/or by pressing it with the plastic, a radially outer edge region of the insert element is folded over in the axial direction onto the outer surface, preferably wherein the radially outward-facing edge surface of the originally unformed, preferably flat insert element, in the folded-over state, contacts in the axial direction an annular projection projecting radially inwards in the cap, which is formed by the plastic molded onto the annular surface.
- the ring surface in the core tool is preferably formed axially above the last thread.
- the ring surface can preferably form a step at which the tapering of the outer surface takes place.
- the ring surface can be formed at least partially or completely flat, but the ring surface is preferably formed concavely towards the outside radially, in particular rounded.
- the outer surface of the core tool is therefore covered by the insert element in the axial end region of the core tool.
- the axial inner end face of the casing tool has radially extending grooves, in particular the radial inner casing surface of the casing tool also has axially extending grooves, preferably with the grooves of the axial end face and the casing surface merging into one another, with reinforcing ribs being formed by the grooves in the cover area and/or in the casing area of the closure cap through the injection molding. This also further improves the stability of the closure cap in the cover area.
- a two-part tamper-evident ring is arranged between the core element and the casing element, which is connected by injection molding to the lower edge region surrounding the closure cap opening radially inside the closure cap, in particular is connected at least in a form-fitting and force-fitting manner, preferably also in a material-fitting manner.
- Such a ring is provided, for example, to indicate the first opening of a container that has been closed with the closure cap according to the invention. It is preferably provided that a part of the two-part tamper-evident ring attached to the closure cap remains in the latter when it is opened and another part remains attached around the container neck.
- the method provides that the core tool comprises a core inner part which is coaxially surrounded by a first core sleeve, which is coaxially surrounded by a second core sleeve, wherein an annular gap which is open in the axial direction is formed between the core sleeves, in particular in the region of their respective axial ends, into which the tamper-evident ring is inserted with at least an axially extending partial region.
- the tamper-evident ring preferably comprises a first division and a second division, which are spaced apart in the axial direction by a gap and are connected in the axial direction by axially extending breakable bridges to bridge the gap, wherein the division pointing in the axial direction to the axial end face of the casing tool closes the annular gap between the core sleeves against the penetration of liquid plastic and is connected to the injected plastic with its surface pointing into the volume area of the injection molding tool.
- the gap between the divisions and any openings or projections, in particular the shape previously formed in the other division, thus remains shielded and unaffected by the injected plastic. Due to the aforementioned breakable bridges, the tamper-evident ring can be broken into the two partial rings when opening a container, so that a (lower) division remains around the container neck and an (upper) division in the closure cap.
- the tamper-evident ring itself can preferably be produced in a preceding injection molding step, in particular from the same material from which the closure cap is formed.
- projections and openings extending radially inwards can preferably be formed in the plastic-shielded part of the tamper-evident ring in the preceding injection molding step, in particular by means of an injection molding tool which comprises a multi-part casing tool whose parts are movable in the radial direction.
- Figure 1 shows a sectional view of a perspectively visualized arrangement of all essential components for carrying out the method for producing a closure cap, which is shown in section in Figure 6.
- the injection molding tool 2 comprises a core tool 2a, which has an inner core part 2a1, a first core sleeve 2a2 arranged coaxially around it and a second core sleeve 2a3 arranged around it.
- the core sleeves 2a2 and 2a3 are preferably axially displaceable relative to the inner core part 2a1 parallel to the common center axis 3.
- An axially displaceable ejector sleeve 2a4 can additionally be arranged coaxially around the outside of the second core sleeve 2a3, e.g. in order to strip the later produced closure cap from the second core sleeve 2a3.
- annular gap 17 is arranged which is open in the axial direction to the casing tool 2b and into which a tamper-evident ring 16 can be used, which is divided in the axial direction into two parts, consisting of an upper part 16a and a lower part 16b.
- the lower division 16b preferably completely penetrates into the annular gap 17, with the upper division 16a closing the axially open side of the annular gap 17.
- an insert element 10 here preferably a flat insert element 10 made of e.g. a fluoropolymer, is inserted axially between the axial end face 6 of the core tool 2a and the axial end face 8 of the casing tool 2b.
- Figure 2 shows that the insert element 10 rests on the ring surface 6a of the axial end face 6, which surrounds a recess 7 in the axial end face 6.
- the recess 7 is covered by the insert element 10.
- the outer diameter of the insert element 10 is larger than the outer diameter of the axial end face 6 and/or than the outer diameter of the ring surface 6a.
- the outer diameter of the insert element 10 can also be smaller than the outer diameter of the axial end face 6 and/or than the outer diameter of the ring surface 6a.
- Figure 3 shows the arrangement of the elements of Figure 1 in a closed state of the injection molding tool 1.
- the core tool 2a consisting of the core inner part 2a1, the core sleeves 2a2, 2a3 and ejector sleeve 2a4 as well as the jacket tool 2b enclose a volume region 4 into which the closure cap 1 is formed by injecting liquid plastic.
- Figure 3 also shows that by closing the injection molding tool 2, the originally non-formed, preferably flat insert element 10 is pre-formed by the projection 9 at least partially dipping into the recess 7, thereby contacting the insert element 10 and carrying it along.
- the insert element can assume any shape within the gap formed between the axial end faces 6 and 8.
- Figure 4A shows an embodiment of the core tool 2a in which the annular surface 6a of the axial end face 6 is partially planar and merges into the recess radially inward and into the lateral surface of the core tool radially outward, preferably rounded in each case.
- ring surface 12 Axially spaced from the ring surface 6, there is a ring surface 12 in the lateral surface, where the lateral surface tapers in diameter in the direction of the ring face 6a or the axial face 6.
- the ring surface 12 is rounded and thus forms a step that is concave radially outwards.
- Other shapes of the ring surface 12 are also possible, e.g. flat or convex outwards.
- Figure 4B shows the arrangement of the formed insert element 10, which is pressed onto the core tool 2a by plastic, without visualizing the plastic. It is clear here that plastic formed onto the ring surface 12 can form an annular projection 13 in the closure cap, to which the edge 10b of the radially outer region 10a of the insert element, which is folded over onto the outer surface after forming and points radially outwards in the non-formed state, is connected in a form-fitting manner in the axial direction.
- Figure 7 shows this annular projection 13 on the produced cap.
- Figure 5 visualizes the actual injection molding process, in which liquid plastic 5, e.g. polyethylene or polypropylene, is injected through the sprue opening 11 into the volume area 4.
- the plastic 5 presses the insert element 10 from the side of the jacket tool 2b onto the front surface 6 of the core tool 2a, or onto the surface of the recess 7 and onto the ring surface 6a, whereby the plastic 5, starting at the sprue opening 11, initially fills the volume 4 radially outwards and then in the axial direction towards the tamper-evident ring 16.
- the injected plastic can bond to the upper part of the ring 16a of the tamper-evident ring 16, preferably in a material-locking manner.
- the plastic 5 does not bond to the contacted surface of the insert element 10 in a material-locking manner, but only in a form-fitting and/or force-fitting manner, in particular if a fluoropolymer was selected as the material of the insert element.
- the radially outer edge region 10a is folded over in the axial direction onto the outer surface of the core tool 2a as shown in Figures 4 and 7.
- an annular surface 12 is arranged in the outer surface of the core tool 2a, in particular of the inner core part, preferably above the last thread, wherein the molding of plastic onto the surface of the annular surface 12 leads to the formation of the annular projection 13, which is contacted in the axial direction by the edge surface 10a of the insert element 10.
- the embodiment according to the invention means that the insert element 10 is held in a form-fitting manner by injected plastic in radial and axial surface areas, so that the insert element 10 is securely fixed in the closure cap 1 even without a material bond to the injection plastic.
- Figure 5 shows an embodiment in which the outer diameter of the insert element 10 after forming and pressing by plastic is smaller than the outer diameter of the ring surface 6a or than the outer diameter of the axial end face 6, so that the insert element 10 rests on the ring surface 6a and does not cover the outer surface.
- Figure 7 further shows the formation of reinforcing ribs 15, which are arranged in the radial direction on the cover area and in the axial direction on the jacket area of the closure cap 1 and are formed by corresponding grooves 14 in the inner surface of the jacket tool.
- Figure 6 further visualizes the preferably material-locking connection of the tamper-evident ring 16 with its upper division 16a in the lower open edge region of the closure cap, in particular in a region of the closure cap 1 where the cap jacket expands radially outwards.
- the upper partial ring 16a is spaced apart from the lower division 16b to form a gap 16c, but is connected to it via axially extending breakable bridges 16.
- the lower division 16b also has projections 16e projecting radially inwards that can engage behind a ring projection on the container neck, and radially extending openings 16f are also formed.
- the manufacture of the tamper-evident ring can be carried out with an injection molding tool according to Figure 9, which comprises radially movable casing tools 18 with radial pins to form the openings 16f.
- Figure 6 also shows the recess formed in the lid area of the closure cap 1, which contributes to the stability of the cap and which is created by the projection on the inside of the casing tool.
- the unit consisting of the core inner part 2a1 and the first core sleeve 2a2 can be demolded from the closure cap 1 by rotation according to the thread formation produced in the injection molding.
- the closure cap can be pushed away from the second core sleeve using the stripper sleeve 2a4.
- the closure cap can be demolded from the casing tool 2b without any problem.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Closures For Containers (AREA)
Abstract
Description
Verfahren zur Herstellung einer Verschlußkappe für Behälter Method for producing a closure cap for containers
Die Erfindung betrifft ein Verfahren zur Herstellung einer Verschlußkappe für Behälter mit einem Spritzgießwerkzeug, welches wenigstens ein Kernwerkzeug und wenigstens ein das Kernwerkzeug übergreifendes Mantelwerkzeug umfasst, die beide um eine gemeinsame Mittenachse ausgebildet sind und die im geschlossenen Zustand des Spritzgießwerkzeugs zwischen sich einen die Verschlußkappe definierenden Volumenbereich bilden, in den geschmolzener Kunststoff injiziert wird. Die Erfindung betrifft auch eine so hergestellte Verschlußkappe. The invention relates to a method for producing a closure cap for containers using an injection molding tool, which comprises at least one core tool and at least one jacket tool that overlaps the core tool, both of which are formed around a common central axis and which, when the injection molding tool is closed, form a volume region between them that defines the closure cap and into which molten plastic is injected. The invention also relates to a closure cap produced in this way.
Das Spritzgießwerkzeug wird vorzugsweise im Stand der Technik wie auch bei der Erfindung dadurch geschlossen, dass das wenigstens eine Kernwerkzeug in Richtung der gemeinsamen Mittenachse in das Mantelwerkzeug eingeführt wird, bis dass diese beiden Werkzeuge einen vorbestimmten gewünschten axialen Abstand zueinander einnehmen. Das Öffnen kann vorzugsweise im Stand der Technik, wie auch bei der Erfindung in umgekehrter Richtung erfolgen, um die hergestellte Verschlußkappe zu entformen, wobei es vorgesehen sein kann, das Mantelwerkzeug dabei um die gemeinsame Mittenachse zu rotieren, z.B. wenn eine Verschlußkappe hergestellt wurde, die ein Innengewinde aufweist und hierfür das Kernwerkzeug auf seiner radial nach außen weisenden Mantelfläche ein korrespondierendes Gewinde bzw. korrespondierende Gewindeabschnitte aufweist. The injection molding tool is preferably closed in the prior art and also in the invention by the at least one core tool being introduced into the casing tool in the direction of the common center axis until these two tools assume a predetermined desired axial distance from one another. The opening can preferably take place in the opposite direction in the prior art and also in the invention in order to demold the closure cap produced, whereby it can be provided that the casing tool rotates about the common center axis, e.g. if a closure cap has been produced that has an internal thread and for this purpose the core tool has a corresponding thread or corresponding thread sections on its radially outward-facing casing surface.
Verfahren zur Herstellung von Behälter-Verschlußkappen durch das Prinzip des Kunststoff-Spritzgießens in einem Spritzgießwerkzeug sind allgemein bekannt, z.B. aus der Publikation EP 4144662 A1. Die so hergestellten Verschlußkappen können für eine Vielzahl verschiedener Behälter eingesetzt werden. Im technischen Bereich von Behältern, z.B. aus Glas oder Kunststoff, z.B. Flaschen oder Kanister, insbesondere die für chemische Stoffe vorgesehen sind, vorzugsweise worauf sich auch die Erfindung bezieht, sind die Anforderungen an die Verschlußkappe hoch. Methods for producing container closure caps using the principle of plastic injection molding in an injection molding tool are generally known, e.g. from the publication EP 4144662 A1. The closure caps produced in this way can be used for a variety of different containers. In the technical field of containers, e.g. made of glass or plastic, e.g. bottles or canisters, in particular those intended for chemical substances, preferably to which the invention also relates, the requirements for the closure cap are high.
Z.B. müssen die Verschlußkappen die Behälter dicht verschließen, hinreichend stabil sein, insbesondere um auch bei einem Sturz des Behälters nicht kaputt zu gehen und müssen einerseits den Inhalt im Behälter vor Stoffen in der Umgebung schützen und andererseits auch die Umgebung vor Stoffen aus dem Inhalt solcher Behälter schützen. Diese Vorgaben werden durch übliche Verschlußkappen häufig nicht eingehalten. For example, the closure caps must seal the containers tightly, be sufficiently stable, especially so that they do not break if the container falls, and must protect the contents of the container from substances in the environment and also protect the environment from substances in the contents of such containers. These requirements are often not met by conventional closure caps.
Es ist daher eine Aufgabe der Erfindung ein Verfahren zur Herstellung einer Verschlußkappe der eingangs genannten Art so weiterzubilden, dass mit dem Verfahren eine sichere und stabile Verschlußkappe erzielt wird. It is therefore an object of the invention to further develop a method for producing a closure cap of the type mentioned at the outset in such a way that a secure and stable closure cap is achieved with the method.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass das Kernwerkzeug eine axiale Stirnfläche aufweist, in der eine die Mittenachse umgebende Ausnehmung ausgebildet ist, und das Mantelwerkzeug an seiner inneren axialen Stirnfläche, einen die Mittenachse umgebenden Vorsprung aufweist, wobei vor dem Schließen des Spritzgießwerkzeuges zwischen die beiden sich gegenüberliegenden axialen Stirnflächen ein Einlegelement, vorzugsweise ein ebenes Einlegeelement, vorzugsweise ein kreisscheibenförmiges Einlegeelement positioniert wird, und mit dem Schließen des Spritzgießwerkzeuges der Vorsprung zumindest teilweise in die Ausnehmung eindringt und hierbei das Einlegeelement umformt, und nach dem Schließen des Spritzgießwerkzeuges der Volumenbereich mit geschmolzenen Kunststoff durch eine im Vorsprung, vorzugsweise auf der Mittenachse positionierte Angussöffnung gefüllt wird, wodurch das Einlegeelement durch den Kunststoff aus der Richtung des Mantelwerkzeuges gegen die axiale Stirnfläche des Kernwerkzeuges angedrückt wird. According to the invention, the object is achieved in that the core tool has an axial end face in which a recess surrounding the central axis is formed, and the jacket tool has a projection surrounding the central axis on its inner axial end face, wherein an insert element, preferably a flat insert element, preferably a circular disk-shaped insert element, is positioned between the two opposing axial end faces before the injection molding tool is closed, and when the injection molding tool is closed, the projection penetrates at least partially into the recess and thereby deforms the insert element, and after the injection molding tool is closed, the volume area is filled with molten plastic through a sprue opening positioned in the projection, preferably on the central axis, whereby the insert element is pressed by the plastic against the axial end face of the core tool from the direction of the jacket tool.
Das Schließen des Spritzgießwerkzeugs erfolgt vorzugsweise durch eine lineare Bewegung zwischen Kernwerkzeug und Mantelwerkzeug Außenwerkzeug, vorzugsweise ohne Rotation der beiden Werkzeuge gegeneinander, es kann aber auch beim Schließen eine Rotation vorgesehen sein, z.B. um die beiden Werkzeuge in eine gewünschte Winkelstellung zueinander zu bringen. The closing of the injection mold is preferably carried out by a linear movement between the core tool and the outer tool, Preferably without rotation of the two tools against each other, but rotation can also be provided during closing, e.g. to bring the two tools into a desired angular position relative to each other.
Vorzugsweise ist die vorgenannte Ausnehmung von einer Ringfläche, vorzugsweise bereichsweise planen Ringfläche umgeben. Die Ausnehmung kann vorzugsweise eine Bodenfläche, insbesondere zumindest bereichsweise eine plane Bodenfläche aufweisen, die in axialer Richtung um die Tiefe der Ausnehmung zur Ringfläche versetzt ist. Die axiale Richtung ist bei dieser Erfindungsbeschreibung allgemein die Richtung der gemeinsamen Mittenachse bzw. parallel dazu. Preferably, the aforementioned recess is surrounded by an annular surface, preferably a partially planar annular surface. The recess can preferably have a bottom surface, in particular at least partially a planar bottom surface, which is offset in the axial direction by the depth of the recess from the annular surface. In this description of the invention, the axial direction is generally the direction of the common center axis or parallel thereto.
Die axiale, insbesondere innere Stirnfläche des Mantelwerkzeuges liegt dabei der axialen Stirnfläche des Kernwerkzeugs im geschlossen Zustand der Spritzgießwerkzeuges unter Bildung eines Abstandes gegenüber, wobei in diesem Abstandsbereich das zuvor noch nicht umgeformte, vorzugsweise plane/ebene Einlegelement liegt. The axial, in particular inner, end face of the shell tool lies opposite the axial end face of the core tool in the closed state of the injection molding tool, forming a distance, wherein the previously not yet formed, preferably flat/level insert element lies in this distance area.
Durch die genannte Umformung wird das Einlegeelement, vorzugsweise das zunächst ebene Einlegelement in Richtung zur endgültigen Form vorgeformt, insbesondere zumindest im Wesentlichen topf- oder schalenförmig vorgeformt, insbesondere in dem Sinn vorgeformt, dass sich das Einlegeelement durch die Umformung bis auf das Spiel im Abstandsbereich zwischen beiden Werkzeuge an die Endform annähert. By means of the aforementioned forming, the insert element, preferably the initially flat insert element, is preformed in the direction of the final shape, in particular at least substantially preformed in the shape of a pot or bowl, in particular preformed in the sense that the insert element approaches the final shape as a result of the forming, except for the play in the distance area between the two tools.
Durch das erfindungsgemäße Vorgehen wird erzielt, dass das Einlegeelement nur einseitig aus der Richtung des Mantelwerkzeuges von Kunststoff überdeckt wird, jedoch in der so hergestellten Verschlußkappe in deren Inneren freiliegt, insbesondere mit Kontakt zum Inhalt eines Behälters, der mit der Verschlußkappe verschlossen werden soll. The procedure according to the invention ensures that the insert element is covered by plastic only on one side from the direction of the casing tool, but is exposed in the interior of the closure cap produced in this way, in particular with contact to the contents of a container which is to be closed with the closure cap.
Dabei ist die Ausnehmung in der axialen Stirnfläche des Kernwerkzeuges so ausgebildet, dass in der hergestellten Kappe hierdurch ein innen vom Kappendeckel vorspringender Vorsprung gebildet wird, der in das Innere des Behälterhalses axial eindringt, wenn der Behälter mit der Kappe verschlossen wird. Ein solcher Vorsprung kann somit vorzugsweise einen am Kappendeckelbereich angeordneten Stopfen bilden, der auch in radialer Richtung eine Dichtfunktion zum inneren Wandbereich des Behälterhalses ausübt. Dabei wird die Dichtung über das Einlegelement erzielt, welches den so gebildeten Stopfen überdeckt. Die eingangs genannte Ringfläche der Stirnfläche des Kernwerkzeuges bildet in dem topf- oder schalenförmig geformten Einlegeelement einen Kragen, insbesondere eine radial aussen liegenden Kragen, der beim Verschließen eines Behälters die Ringstirnfläche des Behälterhalses überdeckt.The recess in the axial face of the core tool is designed in such a way that in the produced cap a A projection protruding from the cap lid is formed, which axially penetrates into the interior of the container neck when the container is closed with the cap. Such a projection can thus preferably form a plug arranged on the cap lid area, which also performs a sealing function in the radial direction to the inner wall area of the container neck. The seal is achieved via the insert element, which covers the plug thus formed. The annular surface of the end face of the core tool mentioned at the beginning forms a collar in the pot- or bowl-shaped insert element, in particular a radially outer collar, which covers the annular end face of the container neck when a container is closed.
Die erfindungsgemäß hergestellte Verschlußkappe hat somit gegenüber dem Stand der Technik eine erweiterte Dichtfunktion. The closure cap produced according to the invention thus has an extended sealing function compared to the prior art.
Der Vorsprung im Mantelwerkzeug ist vorzugsweise weiterhin so ausgebildet, dass in der hergestellten Verschlußkappe außenseitig eine Ausnehmung gebildet wird, vorzugsweise in deren Mitte der Angusspunkt liegt. Hierdurch erhält der Verschlußkappendeckel eine von der rein ebenen Form abweichende Form, insbesondere eine topf- oder schalenförmige Form mit einem radial äußeren Rand am Deckelbereich, der in die zumindest im Wesentlichen axial erstreckte Mantelfläche der Verschlußkappe übergeht. Diese Formgestaltung führt zu einer erhöhten Stabilität der Verschlußkappe besonders in Deckelbereich, der die Behälterhalsöffnung überdeckt und damit auch zu einer verbesserten Dichtigkeit.The projection in the casing tool is preferably also designed in such a way that a recess is formed on the outside of the produced closure cap, preferably in the middle of which the sprue point is located. This gives the closure cap cover a shape that differs from the purely flat shape, in particular a pot- or bowl-shaped shape with a radially outer edge on the cover area that merges into the at least essentially axially extending casing surface of the closure cap. This shape design leads to increased stability of the closure cap, particularly in the cover area that covers the container neck opening, and thus also to improved tightness.
Vorzugsweise ist bei einer erfindungsgemäß hergestellten Verschlußkappe das Einlegeelement das einzige Element der Verschlußkappe, welches mit dem Inhalt des Behälters in Kontakt kommen kann. Das Einlegeelement kann so einerseits eine Dichtfunktion ausüben, aber für den Inhalt des Behälters auch eine Diffusionsbamere bilden, zum einen gegen Diffusion des Inhaltes nach aussen als auch gegen Diffusion von Umgebungsstoffen, z.B. Sauerstoff nach Innen in den Behälter. Die erfindungsgemäße Verschlußkappe erzielt somit mehrere Vorteile durch die Kombination eines umgeformten Einlegelements mit einem zu einem inneren Stopfen ausgeformten Deckelbereich. Preferably, in a closure cap produced according to the invention, the insert element is the only element of the closure cap that can come into contact with the contents of the container. The insert element can thus perform a sealing function on the one hand, but also form a diffusion barrier for the contents of the container, on the one hand against diffusion of the contents to the outside and on the other hand against diffusion of ambient substances, e.g. oxygen, to the inside of the container. The closure cap according to the invention thus achieves several advantages through the combination of a formed insert element with a lid region formed into an inner plug.
Die Erfindung kann dabei vorsehen, die Verschlußkappe immer mit demselben Kunststoff im Spritzguß herzustellen, z.B. aus Polyethylen (PE) oder Polypropylen (PP), wenngleich die Erfindung nicht auf diese Kunststoffe beschränkt ist. The invention can provide for the closure cap to always be manufactured using the same plastic by injection molding, e.g. polyethylene (PE) or polypropylene (PP), although the invention is not limited to these plastics.
Hingehen kann es weiterhin vorgesehen sein, das je nach Einsatzgebiet der herzustellenden Verschlußkappe das Material des mit dem Behälterinhalt in Kontakt kommenden Einlegeelements in Abhängigkeit des vorgesehenen Behälterinhaltes gewählt wird. Furthermore, it can be provided that, depending on the field of application of the closure cap to be produced, the material of the insert element that comes into contact with the container contents is selected depending on the intended container contents.
Bevorzugt ist es vorgesehen, dass das Einlegelement aus einem Fluorpolymer gewählt wird, insbesondere aus einem der folgenden Materialien gewählt wird: Perfluoralkoxy (PFA), Ethylene-Tetrafluoroethylene (ETFE), Ethylen- Chlortrifluorethylen (ECTFE), Polyvinylidenfluorid (PVDF), Polytetrafluorethylen (PTFE). Solche Fluorpolymere haben den Vorteil gegen viele Chemikalien beständig zu sein und insbesondere von flüssigen Chemikalien schlecht benetzt zu werden, so dass im Inneren der Verschlußkappe, insbesondere am Einlegelement nur geringste Mengen des Behälterinhaltes verbleiben können.It is preferably provided that the insert element is selected from a fluoropolymer, in particular from one of the following materials: perfluoroalkoxy (PFA), ethylene-tetrafluoroethylene (ETFE), ethylene-chlorotrifluoroethylene (ECTFE), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE). Such fluoropolymers have the advantage of being resistant to many chemicals and, in particular, of being poorly wetted by liquid chemicals, so that only very small amounts of the container contents can remain inside the closure cap, in particular on the insert element.
Allgemein kann die Erfindung vorsehen, dass das Einlegelement aus einem Material gewählt wird, an welches der Kunststoff beim Spritzgießen nicht stoffschlüssig anbindet, insbesondere erfindungsgemäß dann das Einlegeelement in der Kappe ausschließlich formschlüssig und/oder kraftschlüssig gehalten wird.In general, the invention can provide that the insert element is selected from a material to which the plastic does not bond in a material-locking manner during injection molding, in particular according to the invention the insert element is then held in the cap exclusively in a form-fitting and/or force-fitting manner.
An solchen Materialien, z.B. den zuvor genannten Fluorpolymeren haftet nicht nur der Kunststoff beim Spritzgießen schlecht, sondern - wie erwähnt - dann auf vorteilhafte Weise der Behälterinhalt ebenso schlecht. Durch das formschlüssige Halten wird dennoch eine dauerhafte Position des Einlegelements in der Verschlußkappe gewährleistet. Aufgrund der Umformung des Einlegelementes und des Kontaktierens des injizierten Kunststoffes wird ein Formschluß zwischen dem Einlegeelement und dem injizierten erstarrten Kunststoff bei der erfindungsgemäßen Formgebung sowohl in axial als auch radial orientierten Flächenbereichen des Deckelbereichs der Verschlußkappe erzielt, insbesondere ein Formschluß des erstarrten Injektionskunststoffes mit einer der beiden sich über die Dicke des Einlegelementes gegenüberliegenden, vorzugsweise ursprünglich planen, und erfindungsgemäß verformten Flächen des Einlegeelements. Weiter bevorzugt wird auch ein Formschluß zwischen der radial äußeren Randfläche des ursprünglich nicht umgeformten Einlegelements, vorzugsweise ebenen Einlegelementes und des erstarrten Injektionskunststoffs erzielt, insbesondere wodurch ein randnahes Abschälen des Einlegelementes vom erstarrten Injektionskunststoffes verhindert wird. Not only does the plastic adhere poorly to such materials, eg the previously mentioned fluoropolymers, during injection molding, but - as mentioned - the container contents adhere poorly as well. The form-fitting hold nevertheless ensures that the insert element remains permanently in position in the closure cap. Due to the deformation of the insert element and the contacting of the injected plastic, a positive connection between the insert element and the injected solidified plastic is achieved in the shaping according to the invention in both axially and radially oriented surface areas of the lid area of the closure cap, in particular a positive connection of the solidified injection plastic with one of the two surfaces of the insert element that are opposite each other across the thickness of the insert element, preferably originally flat, and deformed according to the invention. Further preferably, a positive connection is also achieved between the radially outer edge surface of the originally non-formed insert element, preferably flat insert element, and the solidified injection plastic, in particular thereby preventing the insert element from peeling off the solidified injection plastic near the edge.
Die Erfindung kann vorzugsweise vorsehen, dass in einer möglichen Ausführungsform der Kreisscheibendurchmesser des Einlegeelementes so gewählt wird, insbesondere größer oder kleiner gewählt wird als der Außendurchmesser der axialen Stirnfläche, insbesondere als der Außendurchmesser der die Ausnehmung umgebenden Ringfläche, vorzugsweise bereichsweise planen Ringfläche der axialen Stirnfläche des Kernwerkzeuges dass mit dem Eindringen des Vorsprunges in die Ausnehmung und/oder durch das Andrücken mit dem Kunststoff die radial nach außen weisende Randfläche des Einlegeelements auf der axialen Stirnfläche, insbesondere auf der die Ausnehmung umgebenden Ringfläche, vorzugsweise bereichsweise planen Ringfläche der axialen Stirnfläche zu liegen kommt. The invention can preferably provide that in a possible embodiment the circular disk diameter of the insert element is selected in such a way, in particular is selected to be larger or smaller than the outer diameter of the axial end face, in particular than the outer diameter of the annular surface surrounding the recess, preferably partially planar annular surface of the axial end face of the core tool, that with the penetration of the projection into the recess and/or by pressing with the plastic, the radially outward-facing edge surface of the insert element comes to lie on the axial end face, in particular on the annular surface surrounding the recess, preferably partially planar annular surface of the axial end face.
In dieser Ausführung liegt somit vorzugsweise das Einlegelement nach der Umformung ausschließlich axial vor der axialen Stirnfläche des Kernwerkzeuges, ohne dessen Mantelfläche zu umgreifen. In this embodiment, the insert element after the forming process is preferably located exclusively axially in front of the axial end face of the core tool, without encompassing its outer surface.
In einer anderen Ausführung sieht es die Erfindung bevorzugt vor, dass der Kreisscheibendurchmesser des Einlegeelementes größer gewählt wird als der Außendurchmesser der axialen Stirnfläche, insbesondere als der Außendurchmesser der die Ausnehmung umgebenden Ringfläche, vorzugsweise bereichsweise planen Ringfläche der axialen Stirnfläche des Kernwerkzeuges und dass das Kernwerkzeug in seiner Mantelfläche eine Ringfläche aufweist, über die hinweg sich die Mantelfläche im Querschnitt, insbesondere im Außendurchmesser, in Richtung zur axialen Stirnfläche verjüngt, wobei durch das Schließen des Spritzgießwerkzeuges und/oder durch das Andrücken mit dem Kunststoff ein radial äußerer Randbereich des Einlegeelements in axialer Richtung auf die Mantelfläche umgeschlagen wird, vorzugsweise wobei die radial nach außen weisende Randfläche des ursprünglich nicht umgeformten, vorzugsweise ebenen Einlegeelements im umgeschlagenen Zustand in axialer Richtung einen in der Kappe radial nach innen vorspringenden Ringvorsprung kontaktiert, der durch den an die Ringfläche angeformten Kunststoff gebildet wird. In another embodiment, the invention preferably provides that the circular disk diameter of the insert element is selected to be larger than the Outer diameter of the axial end face, in particular as the outer diameter of the annular surface surrounding the recess, preferably partially flat annular surface of the axial end face of the core tool, and that the core tool has an annular surface in its outer surface, over which the outer surface tapers in cross-section, in particular in the outer diameter, in the direction of the axial end face, wherein by closing the injection molding tool and/or by pressing it with the plastic, a radially outer edge region of the insert element is folded over in the axial direction onto the outer surface, preferably wherein the radially outward-facing edge surface of the originally unformed, preferably flat insert element, in the folded-over state, contacts in the axial direction an annular projection projecting radially inwards in the cap, which is formed by the plastic molded onto the annular surface.
Vorzugsweise ist die Ringfläche im Kernwerkzeug axial über dem letzten Gewindegang ausgebildet. Die Ringfläche kann vorzugsweise eine Stufe ausbilden, an der die Verjüngung der Mantelfläche erfolgt. Die Ringfläche kann dabei zumindest bereichsweise oder ganz plan ausgebildet sein, vorzugsweise ist die Ringfläche aber nach radial außen konkav ausgebildet, insbesondere gerundet ausgebildet. In dieser Ausführung wird demnach die Mantelfläche des Kernwerkzeuges von dem Einlegeelement im axialen Endbereich des Kernwerkzeugs überdeckt. The ring surface in the core tool is preferably formed axially above the last thread. The ring surface can preferably form a step at which the tapering of the outer surface takes place. The ring surface can be formed at least partially or completely flat, but the ring surface is preferably formed concavely towards the outside radially, in particular rounded. In this embodiment, the outer surface of the core tool is therefore covered by the insert element in the axial end region of the core tool.
In weiterhin bevorzugter Ausführung, die mit allen Ausführungsvananten der Erfindung kombinierbar ist, ist es vorgesehen, dass die axiale innere Stirnfläche des Mantelwerkzeuges radial erstreckte Rinnen aufweist, insbesondere auch die radiale innere Mantelfläche des Mantelwerkzeuges axial erstreckte Rinnen aufweist, vorzugsweise wobei die Rinnen von axialer Stirnfläche und Mantelfläche ineinander übergehen, wobei durch das Spritzgießen durch die Rinnen im Deckelbereich und/oder im Mantelbereich der Verschlußkappe verstärkende Rippen gebildet werden. Auch hierdurch wird die Stabilität der Verschlußkappe im Deckelbereich weiter verbessert. Bei der Erfindung ist es vorzugsweise weiterhin vorgesehen, dass vor dem Schließen des Spritzgießwerkzeuges ein in axialer Richtung zweiteiliger Originalitätsring zwischen dem Kernelement und dem Mantelelement angeordnet wird, der durch das Spritzgießen am unteren, die Verschlußkappenöffnung umgebenden Randbereich radial innen an der Verschlußkappe angebunden wird, insbesondere zumindest form- und kraftschlüssig, vorzugsweise auch stoffschlüssig angebunden wird. In a further preferred embodiment, which can be combined with all embodiments of the invention, it is provided that the axial inner end face of the casing tool has radially extending grooves, in particular the radial inner casing surface of the casing tool also has axially extending grooves, preferably with the grooves of the axial end face and the casing surface merging into one another, with reinforcing ribs being formed by the grooves in the cover area and/or in the casing area of the closure cap through the injection molding. This also further improves the stability of the closure cap in the cover area. In the invention, it is preferably further provided that, before the injection molding tool is closed, a two-part tamper-evident ring is arranged between the core element and the casing element, which is connected by injection molding to the lower edge region surrounding the closure cap opening radially inside the closure cap, in particular is connected at least in a form-fitting and force-fitting manner, preferably also in a material-fitting manner.
Ein solcher Ring ist z.B. vorgesehen, um das erstmalige Öffnen eines Behälters anzuzeigen, der mit der erfindungsgemäßen Verschlußkappe verschlossen wurde. Dabei ist es vorzugsweise vorgesehen, dass ein an die Verschlußkappe angebundener Teil des zweiteiligen Originalitätsringes beim Öffnen in dieser verbleibt und ein anderer Teil um den Behälterhals herum befestigt bleibt. Such a ring is provided, for example, to indicate the first opening of a container that has been closed with the closure cap according to the invention. It is preferably provided that a part of the two-part tamper-evident ring attached to the closure cap remains in the latter when it is opened and another part remains attached around the container neck.
Vorzugsweise ist es im Verfahren vorgesehen, dass das Kernwerkzeug ein Kerninnenteil umfasst, das von einer ersten Kernhülse koaxial umgeben ist, die von einer zweiten Kernhülse koaxial umgeben ist, wobei zwischen den Kernhülsen, insbesondere im Bereich von deren jeweiligen axialen Enden, ein in axialer Richtung offener Ringspalt ausgebildet ist, in den der Originalitätsring zumindest mit einem axial erstrecken Teilbereich eingesetzt wird. Preferably, the method provides that the core tool comprises a core inner part which is coaxially surrounded by a first core sleeve, which is coaxially surrounded by a second core sleeve, wherein an annular gap which is open in the axial direction is formed between the core sleeves, in particular in the region of their respective axial ends, into which the tamper-evident ring is inserted with at least an axially extending partial region.
Bevorzugt umfasst dabei der Originalitätsring einen ersten Teilung und einen zweiten Teilung, die in axialer Richtung durch einen Spalt beabstandet und in axialer Richtung spaltüberbrückend durch axial erstreckte brechbare Brücken verbunden sind, wobei der in axialer Richtung zur axialen Stirnfläche des Mantelwerkzeug weisende Teilung den Ringspalt zwischen den Kernhülsen gegen das Eindringen von flüssigen Kunststoff verschließt und mit seiner in den Volumenbereich des Spritzgießwerkzeugs weisenden Oberfläche an den injizierten Kunststoff angebunden wird. The tamper-evident ring preferably comprises a first division and a second division, which are spaced apart in the axial direction by a gap and are connected in the axial direction by axially extending breakable bridges to bridge the gap, wherein the division pointing in the axial direction to the axial end face of the casing tool closes the annular gap between the core sleeves against the penetration of liquid plastic and is connected to the injected plastic with its surface pointing into the volume area of the injection molding tool.
Der Spalt zwischen den Teilungen und evtl. Öffnungen oder Vorsprünge, insbesondere die zuvor im anderen Teilung ausgebildete Formgestalt bleibt somit vom injizierten Kunststoff abgeschirmt und unbeeinflusst. Durch die genannten brechbaren Brücken kann der Originalitätsring in die beiden Teilringe beim Öffnungsvorgang eines Behälters aufgebrochen werden, so dass ein (unterer) Teilung um den Behälterhals verbleibt und ein (oberer) Teilung in der Verschlußkappe. The gap between the divisions and any openings or projections, in particular the shape previously formed in the other division, thus remains shielded and unaffected by the injected plastic. Due to the aforementioned breakable bridges, the tamper-evident ring can be broken into the two partial rings when opening a container, so that a (lower) division remains around the container neck and an (upper) division in the closure cap.
Der Originalitätsring selbst kann vorzugsweise in einem vorgelagerten Schritt des Spritzgießens hergestellt wird, insbesondere aus demselbem Material aus dem die Verschlußkappe geformt wird. The tamper-evident ring itself can preferably be produced in a preceding injection molding step, in particular from the same material from which the closure cap is formed.
Z.B. können bevorzugt in den von Kunststoff abgeschirmten Teilung des Originalitätsrings im vorgelagerten Schritt des Spritzgießens radial nach innen erstreckte Vorsprünge und radial erstreckte Öffnungen eingeformt werden, insbesondere mittels eines Spritzgießwerkzeuges, welches ein mehrteiliges Mantelwerkzeug umfasst, dessen Teile in radialer Richtung bewegbar sind. For example, projections and openings extending radially inwards can preferably be formed in the plastic-shielded part of the tamper-evident ring in the preceding injection molding step, in particular by means of an injection molding tool which comprises a multi-part casing tool whose parts are movable in the radial direction.
Ausführungsformen der Erfindung werden anhand der Figuren näher erläutert.Embodiments of the invention are explained in more detail with reference to the figures.
Die Figur 1 zeigt eine Schnittdarstellung einer perspektivisch visualisierten Anordnung aller wesentlicher Komponenten zur Durchführung des Verfahrens, um eine Verschlußkappe herzustellen, die im Schnitt in der Figur 6 gezeigt ist. Figure 1 shows a sectional view of a perspectively visualized arrangement of all essential components for carrying out the method for producing a closure cap, which is shown in section in Figure 6.
Das Spritzgießwerkzeug 2 umfasst ein Kernwerkzeug 2a, welches ein Kerninnenteil 2a1 , eine koaxial darum angeordnete erste Kernhülse 2a2 und eine darum angeordnete zweite Kernhülse 2a3 aufweist. Vorzugsweise sind die Kernhülsen 2a2 und 2a3 relativ zum Kerninnenteil 2a1 axial parallel zur gemeinsamen Mittenachse 3 verschieblich. The injection molding tool 2 comprises a core tool 2a, which has an inner core part 2a1, a first core sleeve 2a2 arranged coaxially around it and a second core sleeve 2a3 arranged around it. The core sleeves 2a2 and 2a3 are preferably axially displaceable relative to the inner core part 2a1 parallel to the common center axis 3.
Außen koaxial um die zweite Kernhülse 2a3 kann noch zusätzlich eine axial verschiebliche Auswerferhülse 2a4 angeordnet sein, z.B. um die später hergestellte Verschlußkappe von der zweiten Kernhülse 2a3 abzustreifen. An axially displaceable ejector sleeve 2a4 can additionally be arranged coaxially around the outside of the second core sleeve 2a3, e.g. in order to strip the later produced closure cap from the second core sleeve 2a3.
Zwischen den Kernhülsen 2a2 und 2a3 ist ein in axialer Richtung zum Mantelwerkzeug 2b offener Ringspalt 17 angeordnet, in den ein Originalitätsring 16 eingesetzt werden kann, der in axialer Richtung zweigeteilt ausgebildet ist aus einem hier oberen Teilung 16a und einem hier unteren Teilung 16b. Between the core sleeves 2a2 and 2a3, an annular gap 17 is arranged which is open in the axial direction to the casing tool 2b and into which a tamper-evident ring 16 can be used, which is divided in the axial direction into two parts, consisting of an upper part 16a and a lower part 16b.
Wie Figur 2 zeigt taucht vorzugsweise der untere Teilung 16b vollständig in den Ringspalt 17 ein, wobei der obere Teilung 16a die axial offene Seite des Ringspalts 17 verschließt. As Figure 2 shows, the lower division 16b preferably completely penetrates into the annular gap 17, with the upper division 16a closing the axially open side of the annular gap 17.
Im geöffneten Zustand des Spritzgießwerkzeugs 2 wird axial zwischen die axiale Stirnfläche 6 des Kernwerkzeuges 2a und die axiale Stirnfläche 8 des Mantelwerkzeuges 2b ein Einlegeelement 10, hier vorzugsweise ein ebenes / planes Einlegeelement 10 aus z.B. einem Fluor-Polymer eingelegt. In der Figur 2 ist dargestellt, dass das Einlegeelement 10 auf der Ringfläche 6a der axialen Stirnfläche 6 aufliegt, welche eine Ausnehmung 7 in der axialen Stirnfläche 6 umgibt. Hierbei wird die Ausnehmung 7 vom Einlegeelement 10 überdeckt. Vorzugsweise ist in der gezeigten Ausführung der Außendurchmesser des Einlegeelememts 10 größer als der Außendurchmesser der axialen Stirnfläche 6 und/oder als der Außendurchmesser der Ringfläche 6a. Der Außendurchmesser des Einlegeelements 10 kann aber auch kleiner sein als der Außendurchmesser der axialen Stirnfläche 6 und/oder als der Außendurchmesser der Ringfläche 6aIn the open state of the injection molding tool 2, an insert element 10, here preferably a flat insert element 10 made of e.g. a fluoropolymer, is inserted axially between the axial end face 6 of the core tool 2a and the axial end face 8 of the casing tool 2b. Figure 2 shows that the insert element 10 rests on the ring surface 6a of the axial end face 6, which surrounds a recess 7 in the axial end face 6. The recess 7 is covered by the insert element 10. Preferably, in the embodiment shown, the outer diameter of the insert element 10 is larger than the outer diameter of the axial end face 6 and/or than the outer diameter of the ring surface 6a. However, the outer diameter of the insert element 10 can also be smaller than the outer diameter of the axial end face 6 and/or than the outer diameter of the ring surface 6a.
Die Figur 3 zeigt die Anordnung der Elemente von Figur 1 in einem geschlossenen Zustand des Spritzgießwerkzeugs 1. Hierbei schließen das Kernwerkzeug 2a aus Kerninnenteil 2a1 , den Kernhülsen 2a2, 2a3 und Auswerferhülse 2a4 sowie das Mantelwerkzeug 2b einen Volumenbereich 4 ein, in den durch Injektion von flüssigem Kunststoff die Verschlußkappe 1 ausgebildet wird. Figure 3 shows the arrangement of the elements of Figure 1 in a closed state of the injection molding tool 1. Here, the core tool 2a consisting of the core inner part 2a1, the core sleeves 2a2, 2a3 and ejector sleeve 2a4 as well as the jacket tool 2b enclose a volume region 4 into which the closure cap 1 is formed by injecting liquid plastic.
Die Figur 3 zeigt weiterhin, dass durch das Schließen des Spritzgießwerkzeugs 2 das ursprünglich nicht umgeformte, vorzugsweise plane Einlegeelement 10 vorverformt wird, dadurch, dass der Vorsprung 9 zumindest teilweise in die Ausnehmung 7 eintaucht, hierbei das Einlegelement 10 kontaktiert und mitführt. Dies gleicht einer Umformung des Einlegeelements 10 durch Tiefziehen. Vorzugsweise kann hierbei das Einlegeelement eine beliebige Form innerhalb des Spaltes einnehmen der zwischen den axialen Stirnflächen 6 und 8 gebildet wird.Figure 3 also shows that by closing the injection molding tool 2, the originally non-formed, preferably flat insert element 10 is pre-formed by the projection 9 at least partially dipping into the recess 7, thereby contacting the insert element 10 and carrying it along. This is similar to a deformation of the insert element 10 by deep drawing. Preferably, the insert element can assume any shape within the gap formed between the axial end faces 6 and 8.
Die Figur 4A zeigt hierbei eine Ausführung des Kernwerkzeuges 2a, bei welcher die Ringfläche 6a der axialen Stirnfläche 6 bereichsweise plan ausgebildet ist und in radial innen die Ausnehmung sowie radial außen in die Mantelfläche des Kernwerkzeuges übergeht, vorzugsweise jeweils gerundet. . Figure 4A shows an embodiment of the core tool 2a in which the annular surface 6a of the axial end face 6 is partially planar and merges into the recess radially inward and into the lateral surface of the core tool radially outward, preferably rounded in each case.
Axial beabstandet zur Ringfläche 6 befindet sich in der Mantelfläche eine Ringfläche 12, an der sich die Mantelfläche in Richtung zur Ringstirnfläche 6a bzw. zur axialen Stirnfläche 6 im Durchmesser verjüngt. Hier ist die Ringfläche 12 gerundet ausgebildet und bildet sonmit eine nach radial außen konkave Stufe. Auch andere Ausformungen der Ringfläche 12 sind möglich, z.B. plan oder konvex nach außen. Axially spaced from the ring surface 6, there is a ring surface 12 in the lateral surface, where the lateral surface tapers in diameter in the direction of the ring face 6a or the axial face 6. Here, the ring surface 12 is rounded and thus forms a step that is concave radially outwards. Other shapes of the ring surface 12 are also possible, e.g. flat or convex outwards.
Die Figur 4B zeigt die Anordnung des umgeformten und durch Kunststoff an das Kernwerkzeug 2a angepressten Einlegeelements 10, ohne den Kunststoff zu visualisieren. Deutlich wird hier, dass an die Ringfläche 12 angeformter Kunststoff einen Ringvorsprung 13 in der Verschlußkappe bilden kann, an den in axialer Richtung der im nicht umgeformten Zustand radial nach außen weisende Rand 10b des nach der Umformung auf die Mantelfläche umgeschlagenen radial äußeren Bereichs 10a des Einlegeelements formschlüssig anschließt. Die Figur 7 zeigt diesen Ringvorsprung 13 an der hergestellten Kappe. Figure 4B shows the arrangement of the formed insert element 10, which is pressed onto the core tool 2a by plastic, without visualizing the plastic. It is clear here that plastic formed onto the ring surface 12 can form an annular projection 13 in the closure cap, to which the edge 10b of the radially outer region 10a of the insert element, which is folded over onto the outer surface after forming and points radially outwards in the non-formed state, is connected in a form-fitting manner in the axial direction. Figure 7 shows this annular projection 13 on the produced cap.
Die Figur 5 visualisiert den eigentlichen Spritzgießvorgang, bei dem flüssiger Kunststoff 5, z.B. Polyethylen oder Polypropylen durch die Angussöffnung 11 in den Volumenbereich 4 injiziert wird. Der Kunststoff 5 drückt dabei von der Seite des Mantelwerkzeugs 2b das Einlegeelement 10 an die Stirnfläche 6 des Kernwerkzeuges 2a, bzw. an die Oberfläche der Ausnehmung 7 und an der Ringfläche 6a an, wobei der Kunststoff 5 startend an der Angussöffnung 11 das Volumen 4 zunächst nach radial außen und dann in axialer Richtung zum Originalitätsring 16 füllt. Auf der in den Volumenbereich 4 weisenden Oberfläche des oberen Teilringes 16a des Originalitätsrings 16 kann der injizierten Kunststoff anbinden, vorzugsweise stoffschlüssig. Figure 5 visualizes the actual injection molding process, in which liquid plastic 5, e.g. polyethylene or polypropylene, is injected through the sprue opening 11 into the volume area 4. The plastic 5 presses the insert element 10 from the side of the jacket tool 2b onto the front surface 6 of the core tool 2a, or onto the surface of the recess 7 and onto the ring surface 6a, whereby the plastic 5, starting at the sprue opening 11, initially fills the volume 4 radially outwards and then in the axial direction towards the tamper-evident ring 16. On the surface facing the volume area 4 The injected plastic can bond to the upper part of the ring 16a of the tamper-evident ring 16, preferably in a material-locking manner.
Es kann vorgesehen sein, dass der Kunststoff 5 hingegen sich mit der kontaktierten Fläche des Einlegeelements 10 nicht stoffschlüssig verbindet, sondern nur formschlüssig und/oder kraftschlüssig, insbesondere wenn als Material des Einlegeelements ein Fluor-Polymer gewählt wurde. It can be provided that the plastic 5, however, does not bond to the contacted surface of the insert element 10 in a material-locking manner, but only in a form-fitting and/or force-fitting manner, in particular if a fluoropolymer was selected as the material of the insert element.
Wenn der Außendurchmesser des Einlegelements 10 größer ist als der Außendurchmesser der axialen Stirnfläche 6, bzw. größer als der Durchmesser von deren Ringfläche 6a, dann wird der radial außen liegende Randbereich 10a gemäß der Darstellung in den Figuren 4 und 7 in axialer Richtung auf die Mantelfläche des Kernwerkzeugs 2a umgeschlagen. If the outer diameter of the insert element 10 is larger than the outer diameter of the axial end face 6, or larger than the diameter of its annular surface 6a, then the radially outer edge region 10a is folded over in the axial direction onto the outer surface of the core tool 2a as shown in Figures 4 and 7.
Bei dieser Ausführung kann bevorzugt vorgesehen sein, dass in der Mantelfläche des Kernwerkzeuges 2a, insbesondere des Kerninnenteils, vorzugsweise über dem letzten Gewindegang, eine Ringfläche 12 angeordnet ist, wobei die Anformung von Kunststoff an die Oberfläche der Ringfläche 12 zur Bildung des Ringvorsprunges 13 führt, der in axialer Richtung von der Randfläche 10a des Einlegeelements 10 kontaktiert wird. Insgesamt ist durch die erfindungsgemäße Ausführung das Einlegelement 10 in radialen und axialen Flächenbereichen formschlüssig von injiziertem Kunststoff formschlüssig gehalten, so dass auch ohne einen Stoffschluß zum Injektionskunststoff das Einlegeelement 10 sicher in der Verschlußkappe 1 fixiert ist. In this embodiment, it can preferably be provided that an annular surface 12 is arranged in the outer surface of the core tool 2a, in particular of the inner core part, preferably above the last thread, wherein the molding of plastic onto the surface of the annular surface 12 leads to the formation of the annular projection 13, which is contacted in the axial direction by the edge surface 10a of the insert element 10. Overall, the embodiment according to the invention means that the insert element 10 is held in a form-fitting manner by injected plastic in radial and axial surface areas, so that the insert element 10 is securely fixed in the closure cap 1 even without a material bond to the injection plastic.
Die Figur 5 zeigt eine Ausführung in welcher der Außendurchmesser des Einlegelements 10 nach der Umformung und dem Anpressen durch Kunststoff kleiner ist als der Außendurchmesser der Ringfläche 6a bzw. als der Außendurchmesser der axialen Stirnfläche 6, so dass das Einlegeelement 10 auf der Ringfläche 6a aufliegt und die Mantelfläche nicht überdeckt. Figure 5 shows an embodiment in which the outer diameter of the insert element 10 after forming and pressing by plastic is smaller than the outer diameter of the ring surface 6a or than the outer diameter of the axial end face 6, so that the insert element 10 rests on the ring surface 6a and does not cover the outer surface.
Die Figur 7 zeigt weiterhin die Ausbildung von verstärkenden Rippen 15, die in radialer Richtung auf dem Deckelbereich und in axialer Richtung auf dem Mantelbereich der Verschlußkappe 1 verlaufen und durch korrespondierende Rinnen 14 in der inneren Oberfläche des Mantelwerkzeuges geformt werden.Figure 7 further shows the formation of reinforcing ribs 15, which are arranged in the radial direction on the cover area and in the axial direction on the jacket area of the closure cap 1 and are formed by corresponding grooves 14 in the inner surface of the jacket tool.
Die Figur 6 visualisiert weiterhin die vorzugsweise stoffschlüssige Anbindung des Originalitätsringes 16 mit seinem oberen Teilung 16a im unteren offenen Randbereich der Verschlußkappe, insbesondere an einem Bereich der Verschlußkappe 1 , wo der Kappenmantel sich radial nach außen erweitert. Figure 6 further visualizes the preferably material-locking connection of the tamper-evident ring 16 with its upper division 16a in the lower open edge region of the closure cap, in particular in a region of the closure cap 1 where the cap jacket expands radially outwards.
Der obere Teilring16a ist unter Bildung eines Spaltes 16c vom unteren Teilung 16b beabstandet, aber dabei über axial erstreckte brechbare Brücken 16 mit diesem verbunden. Im untere Teilung 16b sind weiterhin nach radial innen vorspringende Vorsprünge 16e vorgesehen, die einen Ringvorsprung am Behälterhals hintergreifen können, und auch radial erstreckte Öffnungen 16f eingeformt. The upper partial ring 16a is spaced apart from the lower division 16b to form a gap 16c, but is connected to it via axially extending breakable bridges 16. The lower division 16b also has projections 16e projecting radially inwards that can engage behind a ring projection on the container neck, and radially extending openings 16f are also formed.
Die Herstellung des Originalitätsringes kann mit einem Spritzgießwerkzeug gemäß Figur 9 erfolgen, welche radial bewegbare Mantelwerkzeuge 18 mit radialen Zapfen umfasst, um die Öffnungen 16f zu bilden. The manufacture of the tamper-evident ring can be carried out with an injection molding tool according to Figure 9, which comprises radially movable casing tools 18 with radial pins to form the openings 16f.
Die Figur 6 zeigt ebenso die im Deckelbereich der Verschlußkappe 1 ausgebildete Ausnehmung, die zur Stabilität der Kappe beiträgt, und die durch den Vorsprung innenseitig im Mantelwerkzeug erzeugt wird. Figure 6 also shows the recess formed in the lid area of the closure cap 1, which contributes to the stability of the cap and which is created by the projection on the inside of the casing tool.
Nach dem Spritzgießen gemäß Figur 5 kann die Einheit aus Kerninnenteil 2a1 und erster Kernhülse 2a2 durch Rotation gemäß der im Spritzguß hergestellten Gewindeausbildung aus der Verschlußkappe 1 entformt werden. Die Verschlußkappe kann mit der Abstreiferhülse 2a4 von der zweiten Kernhülse weggeschoben werden. Die Verschlußkappe entformt sich problemlos aus dem Mantelwerkzeug 2b. After injection molding according to Figure 5, the unit consisting of the core inner part 2a1 and the first core sleeve 2a2 can be demolded from the closure cap 1 by rotation according to the thread formation produced in the injection molding. The closure cap can be pushed away from the second core sleeve using the stripper sleeve 2a4. The closure cap can be demolded from the casing tool 2b without any problem.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023110959.6 | 2023-04-27 | ||
| DE102023110959.6A DE102023110959A1 (en) | 2023-04-27 | 2023-04-27 | Method for producing a closure cap for containers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024223191A1 true WO2024223191A1 (en) | 2024-10-31 |
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ID=90717985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2024/058178 Pending WO2024223191A1 (en) | 2023-04-27 | 2024-03-27 | Method for producing a closure cap for containers |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102023110959A1 (en) |
| WO (1) | WO2024223191A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4618121A (en) * | 1984-08-15 | 1986-10-21 | American Safety Closure Corp. | Mold for forming plastic cap with perforation about the periphery of the skirt |
| JP2003095299A (en) * | 2001-09-20 | 2003-04-03 | Shirouma Science Co Ltd | Cap with tamper evident ring and production method therefor |
| JP2006001554A (en) * | 2004-06-15 | 2006-01-05 | Toppan Printing Co Ltd | Cap with tamper-evident prevention function |
| DE102007001779A1 (en) * | 2007-01-05 | 2008-07-10 | Georg Menshen Gmbh & Co. Kg | Production of a plastic closure cap for an injection molding machine comprises placing a disk-like insertion part onto the core of an injection molding machine and injecting the tool hollow chamber with plastic |
| US11242177B2 (en) * | 2016-09-23 | 2022-02-08 | SOCIETE ANONYME DES EAUX MINERALES D'EVIAN et en abrégé “S.A.E.M.E” | Double tamper evidence cap for a neck of a container, system including said cap and a container and method for manufacturing said cap |
| EP4144662A1 (en) | 2021-09-07 | 2023-03-08 | Capartis AG | Closure cap, container comprising the closure cap and method for manufacturing a closure cap |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0303788B1 (en) * | 1983-05-25 | 1992-12-16 | Showa Denko Kabushiki Kaisha | Injection molding method of manufacturing container covers |
| WO2005058574A2 (en) * | 2003-12-16 | 2005-06-30 | Weidmann Plastics Technology Ag | Method for producing injection molded parts, injection molding device for implementing said method and injection molded part produced according to said method |
-
2023
- 2023-04-27 DE DE102023110959.6A patent/DE102023110959A1/en active Pending
-
2024
- 2024-03-27 WO PCT/EP2024/058178 patent/WO2024223191A1/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4618121A (en) * | 1984-08-15 | 1986-10-21 | American Safety Closure Corp. | Mold for forming plastic cap with perforation about the periphery of the skirt |
| JP2003095299A (en) * | 2001-09-20 | 2003-04-03 | Shirouma Science Co Ltd | Cap with tamper evident ring and production method therefor |
| JP2006001554A (en) * | 2004-06-15 | 2006-01-05 | Toppan Printing Co Ltd | Cap with tamper-evident prevention function |
| DE102007001779A1 (en) * | 2007-01-05 | 2008-07-10 | Georg Menshen Gmbh & Co. Kg | Production of a plastic closure cap for an injection molding machine comprises placing a disk-like insertion part onto the core of an injection molding machine and injecting the tool hollow chamber with plastic |
| US11242177B2 (en) * | 2016-09-23 | 2022-02-08 | SOCIETE ANONYME DES EAUX MINERALES D'EVIAN et en abrégé “S.A.E.M.E” | Double tamper evidence cap for a neck of a container, system including said cap and a container and method for manufacturing said cap |
| EP4144662A1 (en) | 2021-09-07 | 2023-03-08 | Capartis AG | Closure cap, container comprising the closure cap and method for manufacturing a closure cap |
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| Publication number | Publication date |
|---|---|
| DE102023110959A1 (en) | 2024-10-31 |
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