EP3515679A1 - Procédé pour la fabrication d'un élément de fermeture plat pour une ouverture de récipient présentant au moins une zone mince - Google Patents

Procédé pour la fabrication d'un élément de fermeture plat pour une ouverture de récipient présentant au moins une zone mince

Info

Publication number
EP3515679A1
EP3515679A1 EP17749156.0A EP17749156A EP3515679A1 EP 3515679 A1 EP3515679 A1 EP 3515679A1 EP 17749156 A EP17749156 A EP 17749156A EP 3515679 A1 EP3515679 A1 EP 3515679A1
Authority
EP
European Patent Office
Prior art keywords
plastic material
closure element
injection
mold cavity
closure
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.)
Withdrawn
Application number
EP17749156.0A
Other languages
German (de)
English (en)
Inventor
Christian Krammer
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.)
Alpla Werke Alwin Lehner GmbH and Co KG
Original Assignee
Alpla Werke Alwin Lehner GmbH and Co KG
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 Alpla Werke Alwin Lehner GmbH and Co KG filed Critical Alpla Werke Alwin Lehner GmbH and Co KG
Publication of EP3515679A1 publication Critical patent/EP3515679A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0053—Moulding articles characterised by the shape of the surface, e.g. ribs, high polish
    • B29C37/0057—Moulding single grooves or ribs, e.g. tear lines
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • 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
    • B65D41/50—Caps or cap-like covers with membranes, e.g. arranged to be pierced
    • 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
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/72—Contents-dispensing means
    • B65D5/74—Spouts
    • B65D5/746—Spouts formed separately from the container
    • 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
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/72—Contents-dispensing means
    • B65D5/74—Spouts
    • B65D5/746—Spouts formed separately from the container
    • B65D5/747—Spouts formed separately from the container with means for piercing or cutting the container wall or a membrane connected to said wall
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/5675—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding for making orifices in or through the moulded article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0065—Permeability to gases
    • B29K2995/0067—Permeability to gases non-permeable
    • 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
    • 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
    • B65D47/00—Closures with filling and discharging, or with discharging, devices
    • B65D47/04—Closures with discharging devices other than pumps
    • B65D47/06—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages
    • B65D47/10—Closures with discharging devices other than pumps with pouring spouts or tubes; with discharge nozzles or passages having frangible closures

Definitions

  • the invention relates to a method for producing a flat closure element for a container opening with at least one thin point according to the preamble of claim 1.
  • Flowable or liquid food, but also bulk material such as sugar, flour, coffee, powder for instant drinks, milk powder, toddler food etc. are often stored in containers having a relatively large opening in relation to the outer dimensions of the container. Examples of such containers are milk or yoghurt containers but also small capsule-type containers for coffee machines.
  • it is also intended to prevent outward diffusion of aromas or even exposure to radiation such as visible light or ultraviolet light.
  • the container walls are often constructed from composite materials and have one or more barrier layers which are intended to prevent the penetration of oxygen and / or water vapor or the outward diffusion of aromas.
  • the container opening is usually covered with a closure part made of a composite material in the form of a film, which forms a barrier layer against oxygen and / or water vapor and is usually connected to the opening edge by gluing or sealing.
  • closure members include various types of polymers, such as polyamide (PA), polypropylene (PP) or polyethylene (PE).
  • PA polyamide
  • PP polypropylene
  • PE polyethylene
  • connection of the closure part at the opening of the container is provided with a desired release point.
  • Target release points are always a weak point, because there is a risk that the closure part over time automatically triggers and the tightness against oxygen and water vapor is no longer guaranteed.
  • Containers are also known which are provided with a piercing or cutting device for the closure part made of composite material, which can be arranged inside a closure cap which can be screwed onto the opening.
  • piercing or cutting device for the closure part made of composite material which can be arranged inside a closure cap which can be screwed onto the opening.
  • closing parts with thin spots can be produced in an injection molding process.
  • injection molding of the plastic is also trying to form on the closure part thin bodies, which are to serve as predetermined breaking points later.
  • the thin spot limits the size of the injected part, since the plasticized plastic material during injection molding at the thin point solidifies too quickly or causes excessive pressure loss.
  • the thin point In order to still be able to produce larger closure parts, the thin point must be made relatively thick-walled, which can lead to problems when later breaking the closure part.
  • the plastic material must be very thin.
  • the injection molding process must be carried out with very high pressures and very short injection times. Typically, pressures of 1,800 to 2,500 bar and injection times of 0.1 to 0.4 sec. This leads to a very high mechanical stress on the injection molding tool and the injection molding.
  • the closure member for attachment to the opening of the container is prepared in a separate working step and must be brought together at the right time, usually at the bottler, with the container in order to perform the closing process can. This requires a considerable logistical and equipment expense, which makes the production and filling of the container more expensive.
  • the separate film usually consists of composite materials that are different from the materials from which the containers are made. This can prove to be disadvantageous in recycling and is therefore undesirable for ecological reasons. It is therefore an object of the present invention to modify a method for producing a closure element for a container opening with at least one thin location in such a way that materials of higher viscosity can also be processed.
  • a method for producing a closure element is to be provided, which allows the closure element to be integrally molded onto the pouring opening of the container or formed integrally with the pouring opening.
  • the solution of these objects consists in a method for producing a closure element for a container opening with at least one thin point, which has the features listed in claim 1. Further developments and / or advantageous embodiments of the invention are the subject of the dependent claims.
  • the invention proposes a method for producing a closure element for closing a container opening, which has at least one thin spot of a predetermined minimum wall thickness, in which a predeterminable amount of a plasticized plastic material is introduced into a mold cavity of an injection mold of an injection molding device, the plastic material by cooling or a Crosslinking reaction brought to solidification and after opening the injection mold, the closure element is formed.
  • the inventive method is characterized in that the plasticized plastic material is introduced into the mold cavity of the not yet completely closed injection mold.
  • the mold cavity is only partially filled with the plastic material.
  • the injection mold is completely closed during or after the introduction of the plasticized plastic material. By closing the injection mold, the plastic material is distributed throughout the mold cavity and this completely filled. As a result, the closure element is formed with the at least one thin spot in the predetermined minimum wall thickness.
  • the introduction of the plastic melt takes place in the virtually pressureless, not completely closed injection mold.
  • the mold cavity is only partially with the Filled plastic material.
  • the injection mold is completely closed during or after the injection process. The thereby building up evenly
  • Closing pressure ensures a distribution of the injected plastic within the mold cavity and a complete filling of the mold cavity and thus the final formation of the closure part.
  • the at least one thin spot on the closure part is thereby forcibly generated, since the contour is formed to form the thin spot on Schlies steep and / or on the opposite Wermaschineteil the injection molding tool, respectively, is in one piece.
  • the embossing of the thin point (s) is decoupled from the closing of the Spritzgiesstechnik- tool by after the closing of the injection mold a separate die is delivered to an opposite tool part, in the inventive method no die is required , This simplifies the injection mold and its operation procedure.
  • the Schlies steep and the opposite tool part of the injection mold have the introduction of the plastic material in the mold cavity at those points where thin areas on the closure part to be formed, a sufficiently large distance that the plastic material can easily flow over these locations during injection.
  • the closing pressures occurring when closing the injection molding tool are lower than in the injection molding of the prior art. Since the injection molding tool is not yet completely closed when the plastic melt is introduced, the minimum wall thicknesses of the at least one thin point of the flat closure element are not limiting with regard to the usable plastic materials, in particular their viscosity, and with respect to the size of the closure element. Thus, even higher viscosity materials can be used. As a result of the injection molding tool, which has not yet been completely closed, the gap width at the at least one thin point can still be set so great that the risk of the plastic melt freezing out at the thin point or an excessively high pressure loss is virtually eliminated. In addition, the inner wall of the mold cavity can also be heated.
  • the at least one thin spot on the closure element can be formed very precisely in the embossing process following the material introduction by the complete closure of the injection molding tool.
  • the final wall thickness is set only by the embossing process, lower minimum wall thicknesses of the thin point can be achieved. This can prove to be very advantageous especially in closure elements with predetermined breaking point.
  • On separate Aufbrech- or cutting tools can be waived under certain circumstances, or they can be made less massive.
  • a functional part with a pouring opening which can be closed by a rotary closure, for example, and a shoulder are injection-molded onto the closure part.
  • the molded part of closure element and functional element can be removed from the injection mold.
  • a method variant of the invention can provide that the injection molding tool for introducing the plasticized plastic material is closed at least to the extent that leakage of the introduced plastic material from the mold cavity of the injection mold is prevented. This is not absolutely necessary; For example, a reservoir for excess plastic melt could be provided. However, by preventing leakage of the plastic melt from the mold cavity, unintentional contamination of the injection molding machine can be avoided.
  • the injection mold can remain open to different degrees.
  • the injection mold for the introduction of the plasticized plastic material is closed to at least 5%.
  • the inventive method allows the very precise formation of very thin-walled thin areas.
  • the at least one thin point can be formed with a wall thickness of 0.02 mm to 1 mm.
  • the at least one thin point can be formed with a wall thickness of 0.05 mm to 0.8 mm.
  • an alternative method variant can provide that the at least one thin point is formed with a wall thickness of only 0.1 mm to 0.4 mm.
  • wall thickness ranges for the thin point are not conclusive.
  • wall thickness ranges of only 0.02 mm to 0.05 mm or any wall thickness ranges can be produced within the specified limits for minimum and maximum wall thicknesses, it should be necessary and expedient for an intended molding, respectively closure element.
  • the closure element is produced with a barrier material against entry of oxygen and / or water vapor and / or radiation and / or outdiffusion of aromas.
  • a flat closure element can serve, for example, for the breakable closure of an opening of a food packaging whose contents are to be protected against the ingress of oxygen and / or water vapor and / or radiation and / or outdiffusion of aromas. Radiation can be visible light or ultraviolet light.
  • Such food packaging can be eg milk packs or yoghurt containers, but also capsule-type packages for powdered or liquid coffee concentrates for coffee machines.
  • the barrier material of the closure element is embedded on all sides in a plastic material, which may be different from the barrier material.
  • This variant of the method may be of advantage in particular for barrier materials which otherwise would be difficult to attach to a container opening.
  • the barrier material can be embedded in a material that bonds well with the container material.
  • a barrier material may be used which would chemically react with the container contents, such as EVOH.
  • Another variant of the process control can provide that the embedding of the barrier material in a 2-component or multi-component injection molding process is carried out. 2-component or multi-component injection molding methods are well proven and allow the production of molded parts, which consist of two or more plastic materials. In the simplest case, the plastic materials differ only in their color in order to achieve a specific design.
  • the 2-component or multi-component injection molding methods allow, in particular, the use of different materials in order to combine different natural shafts in a targeted manner.
  • barrier materials to oxygen and / or water vapor and / or radiation / and / or outdiffusion with low density polyethylene (LDPE) or with high density polyethylene (HDPE) or with polypropylene can be combined in this way.
  • PA polyamide
  • PEF polyethylene enfuranoate
  • PPF Polypropylenfuranoat
  • EVOH polyethylene vinyl alcohol
  • EVA polyethylene vinyl acetate
  • the inventive process also allows the processing of higher-viscosity plastic materials.
  • the plastic material introduced into the mold cavity of the injection molding tool can have a melt flow index of> 1 g / 10 min or even greater than 3 g / 10 min.
  • plastic materials are polypropylene (PP), high density polyethylene (HDPE), which are otherwise used primarily for the plastic blowing process.
  • a functional part can be injected onto the closure part.
  • the functional part can, for example, be part of a closure. It may be a dome-shaped portion of a packaging member which is liquid-tightly connected to a substantially cylindrical container.
  • the molded-on functional part can be designed for connection to a plastic-coated cardboard container of a milk package.
  • the functional part may be formed as a capsule-like container.
  • the previously produced closure element with thin spot can be designed such that the thin point breaks up under the effect of temperature and pressure after a predetermined time.
  • the molding of the functional part of the closure member is conveniently carried out with the aid of a cube tool, turntable tool or another form of 2-component or multi-component tools.
  • Injection molding machines with cube tools are space-saving and allow high productivity by simultaneously carrying out various production steps on the available sides of the cube tool.
  • the cube tool may be, for example, a 180 ° tool or a 90 ° tool.
  • Fig. 2 shows an enlarged view of a detail of Figure 1 with indicated thin spot.
  • FIG. 4 shows, in analogy to FIG. 2, an enlarged view from FIG. 3 with an indicated thin spot
  • the injection molding tool comprises a first tool part 1 and a relative to the first tool part 1 displaceably mounted second tool part 2.
  • the first tool part 1 may for example be a rotatably mounted middle segment of a cube tool.
  • the second tool part 2 is horizontally displaceable relative to the first tool part 1 and has an inlet 3 for a plastic material P which can be supplied via a feed channel 4, for example a hot runner.
  • the first tool part 1 and the second tool part 2 define a closed state Mold cavity 5, which determines the shape of an injection-molded closure element 6, as better seen in Figure 2.
  • the reference symbols 9 designate ejectors for the closure element 6 formed inside the mold cavity 5.
  • Fig. 1 shows the first tool part 1 and the second tool part 2 in not yet completely closed state.
  • the two tool parts 1, 2 are, for example, just as far facing each other that a leakage of the injected into the mold cavity 5 plasticized plastic material P is avoided.
  • the two tool parts 1, 2 are approximated to at least 5% of the closed state.
  • the distance d of a first bearing surface 11 on the first tool part 1 and a second bearing surface 21 on the second tool part 2, the casting mold 10 in the closed state of the mold abut against each other is at most 3 mm.
  • the at least one thin point 61 does not have its final minimum wall thickness, but is also widened by the distance d between the first and the second tool parts 1, 2.
  • the at least one thin spot 61 may be formed, for example, annular. It is understood, however, that the shape, the number and the arrangement of the thin bodies can be chosen differently depending on the respective requirements.
  • Fig. 1 and Fig. 2 further show that the mold cavity 5 is not completely filled, so that the complete closure of the two tool parts 1, 2 sufficient space for the displaced plastic material remains.
  • the processable materials therefore include high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), polypropylene homopolymer (PP-H), block copolymer polypropylene (PP-B), random copolymer polypropylene (PP-R), polyethylene terephthalate (PET), polyethylene furanoate (PEF), polypropylene furanout (PPF), polystyrene (PS), polylactides (PLA), polyamide (PA), acrylonitrile-butadiene-styrene copolymer (ABS), polyoxymethylene (POM ), their copolymers and mixtures of said plastics.
  • HDPE high density polyethylene
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • PP-H polypropylene homopolymer
  • PP-B block copolymer polypropylene
  • P-R random copolymer polypropylene
  • PET polyethylene terephthalate
  • the injection mold 10 is shown in FIGS. 1 and 2 in the fully closed state.
  • the first and second abutment surfaces 11, 12 on the first and second tool parts 1, 2 abut each other and can be pressed together with a closing force of up to 10,000 N.
  • the mold cavity 5 is reduced to its nominal volume.
  • the thereby displaced plastic melt P fills the mold cavity 5 completely.
  • the complete closure of the injection mold is carried out during or after the injection of the introduced plastic melt.
  • the fixed by the mold cavity 5 surface closure element 6 is pressed or embossed by the closing process in its final form.
  • the at least one thin point 61 also receives its minimum wall thickness w predetermined by the mold cavity 5.
  • the at least one thin point 61 with a wall thickness w of 0.05 mm to 0.8 mm can be formed.
  • an alternative method variant of the invention can provide that the at least one thin point 61 is formed with a wall thickness w of 0, 1 mm to 0.4 mm.
  • the stated wall thickness ranges for the thin point 61 are not conclusive. For example, wall thickness ranges of only 0.02 mm to 0.05 mm, or 0.05 mm to 0.1 mm, or 0.4 mm to 0.8 mm, or 0.8 mm to 1 mm, or any Further wall thickness ranges are produced within the specified limits for minimum and maximum wall thicknesses, it should be necessary and expedient for an intended molding.
  • FIG. 5 shows an exemplary embodiment of a closure element 6 with at least one thin point 61, to which a functional part 8 has been injection-molded.
  • the functional part 8 is, for example, a dome-shaped packaging part which can be connected in a liquid-tight manner to a container, for example a plastic-coated cardboard container of a milk packaging.
  • the flat closure part 6 extends within the functional part 8 at a transition from a shoulder portion 81 to a neck portion 82, which may be provided with an external thread 83 or the like, for example.
  • an internal thread 84 may be formed.
  • the internal thread may be provided in addition or alternatively to the external thread.
  • the external thread the mounting of a rotary closure on the neck portion 82 and the internal thread 84 allows the mounting of a piercing element.
  • the at least one thin point 61 is, for example, of annular design and forms a predetermined breaking point of the closure element 6 in order to access the contents of the container connected to the functional part.
  • the closure element 6 is breakable at the thin point 61 by pressure, or by means of an aid sliceable or pierceable.
  • a thickened indicated region in the center of the flat closure element 6 represents an injection point 62 of the closure part 6.
  • the injection molding of the functional part 8 on the closure element 6 can take place with the aid of a cube tool.
  • Injection molding machines of this type are space-saving and allow high productivity by simultaneously performing various manufacturing steps on the available sides of the die tool.
  • the cube tool may be, for example, a 180 ° tool or a 90 ° tool. Accordingly, the further production steps can be carried out on two opposite sides of the cube or on all four sides of the cube.
  • the flat closure element 6 may comprise a barrier material to oxygen and / or water vapor, and / or a barrier material prevents the outdiffusion of flavors or exposure to radiation such as visible light or ultraviolet light and is embedded in a different plastic from the barrier material.
  • the closure element 6 can also be made wholly from such a barrier material.
  • Such a flat closure element 6 can serve, for example, for breakable closure of an opening of a life-pack whose life is to be protected against the ingress of oxygen and / or water vapor.
  • Such food packaging can be, for example, milk packs or yoghurt containers, but also capsule-type packages for powdery or liquid coffee concentrates for automatic coffee machines.
  • the barrier material of the closure element 6 can be embedded on all sides in a plastic material, which is different from the barrier material. This may be particularly advantageous for barrier materials, which are otherwise difficult to attach to a container opening or chemically react with the container contents.
  • the embedding of the barrier material can be done, for example, in a material that can be very well connected to the container material.
  • the embedding of the barrier material of the closure element 6 can be carried out in a 2-component or multi-component injection molding process. Two-component or multi-component injection molding processes have been tried and tested and permit the production of molded parts consisting of two or more plastic materials. In the simplest case, the plastic materials differ only in their color in order to achieve a specific design.
  • barrier materials can be combined with oxygen and / or water vapor with low density polyethylene (LDPE) or with high density polyethylene (HDPE) or with polypropylene.
  • LDPE low density polyethylene
  • HDPE high density polyethylene
  • polypropylene polypropylene
  • barrier materials polyamide (PA), polyethylene furanoate (PEF), polypropylene furananoate (PPF), polyethylene vinyl alcohol (EVOH), polyethylene vinyl acetate (EVA), their copolymers and mixtures of said plastics can be used.
  • PA polyamide
  • PEF polyethylene furanoate
  • PPF polypropylene furananoate
  • EVOH polyethylene vinyl alcohol
  • EVA polyethylene vinyl acetate
  • the functional part injection-molded with at least one thin spot following the production of the closure element according to the invention can be designed as a capsule-like container.
  • the previously produced closure element with thin spot can be designed such that the thin point breaks up under the effect of temperature and pressure after a predetermined time.
  • Such capsule-type containers can be used, for example, as so-called coffee capsules in conjunction with coffee machines.
  • the invention describes a method for producing a closure element for closing a container opening, which has at least one thin spot of a predetermined minimum wall thickness, in which a predeterminable amount of a plasticized plastic material is introduced into a mold cavity of an injection molding tool of an injection molding device, the plastic material by cooling or one Crosslinking reaction brought to solidification and after opening the Spritzgies- tool, the closure element is configured.
  • the plasticized plastic material is thereby introduced into the mold cavity of the not yet completely closed injection mold.
  • the mold cavity is only partially filled with the plastic material.
  • the injection molding tool is closed during or after the injection process. By closing the injection mold, the plastic material is distributed over the entire mold cavity and this filled completely.
  • the closure element is formed with the at least one thin spot in the predetermined minimum wall thickness.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé pour la fabrication d'un élément de fermeture (6) pour fermer une ouverture de récipient, qui présente au moins une zone mince (61) d'une épaisseur de paroi minimale prédéterminée, dans lequel une quantité pouvant être prédéfinie d'une matière synthétique (P) plastifiée est introduite dans une cavité de moulage (5) d'un outil (10) de moulage par injection d'un dispositif de moulage par injection, la matière synthétique (P) est solidifiée par refroidissement ou par une réaction de réticulation et l'élément de fermeture (6) est façonné après l'ouverture de l'outil (10) de moulage par injection. La matière synthétique (P) plastifiée est introduite dans la cavité de moulage (5) de l'outil (10) de moulage par injection qui n'est pas encore complètement fermée. La cavité de moulage (5) n'est remplie que partiellement par la matière synthétique (P). L'outil (10) de moulage par injection est fermé pendant ou après le processus d'injection. La matière synthétique (P) est répartie sur toute la cavité de moulage (5) et celle-ci est complètement remplie par la fermeture de l'outil (10) de moulage par injection. L'élément de fermeture présentant ladite au moins une zone mince (61) présentant l'épaisseur de paroi minimale prédéfinie est ainsi formé.
EP17749156.0A 2016-09-22 2017-07-27 Procédé pour la fabrication d'un élément de fermeture plat pour une ouverture de récipient présentant au moins une zone mince Withdrawn EP3515679A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01235/16A CH712945A1 (de) 2016-09-22 2016-09-22 Verfahren zur Herstellung eines flächigen Verschlusselements mit wenigstens einer Dünnstelle zum Verschliessen einer Behälteröffnung.
PCT/EP2017/069052 WO2018054585A1 (fr) 2016-09-22 2017-07-27 Procédé pour la fabrication d'un élément de fermeture plat pour une ouverture de récipient présentant au moins une zone mince

Publications (1)

Publication Number Publication Date
EP3515679A1 true EP3515679A1 (fr) 2019-07-31

Family

ID=57046917

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17749156.0A Withdrawn EP3515679A1 (fr) 2016-09-22 2017-07-27 Procédé pour la fabrication d'un élément de fermeture plat pour une ouverture de récipient présentant au moins une zone mince

Country Status (3)

Country Link
EP (1) EP3515679A1 (fr)
CH (1) CH712945A1 (fr)
WO (1) WO2018054585A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH679843A5 (fr) * 1989-06-13 1992-04-30 Tetra Pak Romont
JP2870341B2 (ja) * 1993-01-27 1999-03-17 凸版印刷株式会社 ガスバリヤ性を有する口栓の製造方法
JP2896495B2 (ja) * 1996-07-01 1999-05-31 株式会社久保田金型工作所 合成樹脂製のキャップの製造装置
JP2000025816A (ja) * 1998-07-14 2000-01-25 Dainippon Printing Co Ltd 注出口の成形方法及び装置並びに注出口
DE602006014083D1 (de) * 2006-01-27 2010-06-17 Tetra Laval Holdings & Finance Verfahren und Vorrichtung zum Anbringen von Öffnungsvorrichtungen an Verpackungen für fliessfähige Lebensmittel
SE532765C2 (sv) * 2008-06-19 2010-04-06 Tetra Laval Holdings & Finance Metod och anordning för formsprutning vid tillverkning av förpackningsbehållare

Also Published As

Publication number Publication date
WO2018054585A1 (fr) 2018-03-29
CH712945A1 (de) 2018-03-29

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