EP0155021B2 - A closure cap provided with a gasket and a sealing ring from an olefin polymer - Google Patents

A closure cap provided with a gasket and a sealing ring from an olefin polymer Download PDF

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Publication number
EP0155021B2
EP0155021B2 EP85200149A EP85200149A EP0155021B2 EP 0155021 B2 EP0155021 B2 EP 0155021B2 EP 85200149 A EP85200149 A EP 85200149A EP 85200149 A EP85200149 A EP 85200149A EP 0155021 B2 EP0155021 B2 EP 0155021B2
Authority
EP
European Patent Office
Prior art keywords
closure cap
gasket
plastisol
container
cap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP85200149A
Other languages
German (de)
French (fr)
Other versions
EP0155021A1 (en
EP0155021B1 (en
Inventor
Wiebren Durk Halbe Kornelis
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.)
Kornelis' Kunsthars Producten Industrie BV
Kornelis Kunsthars Producten Industrie BV
Original Assignee
Kornelis' Kunsthars Producten Industrie BV
Kornelis Kunsthars Producten Industrie BV
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19843469&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0155021(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kornelis' Kunsthars Producten Industrie BV, Kornelis Kunsthars Producten Industrie BV filed Critical Kornelis' Kunsthars Producten Industrie BV
Priority to AT85200149T priority Critical patent/ATE34148T1/en
Publication of EP0155021A1 publication Critical patent/EP0155021A1/en
Application granted granted Critical
Publication of EP0155021B1 publication Critical patent/EP0155021B1/en
Publication of EP0155021B2 publication Critical patent/EP0155021B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
    • B65D53/06—Sealings formed by liquid or plastic material
    • 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
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/04—Threaded or like caps or cap-like covers secured by rotation
    • B65D41/0435—Threaded or like caps or cap-like covers secured by rotation with separate sealing elements
    • B65D41/0442—Collars or rings
    • 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
    • B65D41/3461—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt the tamper element being retracted by heat or by heat and pressure
    • B65D41/3466—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt the tamper element being retracted by heat or by heat and pressure and being integrally connected to the closure by means of bridges
    • 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
    • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
    • B65D53/02—Collars or rings

Definitions

  • the invention relates to a method for making a container closure cap made of polypropylene and comprising an end wall and a circumferential side wall, the cap comprising a pilfer-proof device, the cap being provided with a gasket made from a plastisol material arranged to seal on the edge of the container neck, the cap being obtained starting from a combination of the closure cap with the pilfer-proof device and adding an amount of the plastisol material, the gasket being formed by heating the closure cap after addition of the plastisol to a chosen temperature and by subsequently exposing the resulting plastisol shaped into the gasket configuration to electro-magnetic energy until the plastisol has completely fluxed, the pilfer-proof device being designed as a sealing ring with which the container can be sealably closed in conjunction with a locking collar disposed around the neck of the container, said sealing ring being integrally connected with the side wall of the closure cap via frangible bridges capable of being broken on first opening of the container, said frangible bridges
  • Such a method and the closure cap made with such method is known from WO-A-84/00346.
  • the method according to the invention is characterized in that said space is also bounded by an inner undercut, the end wall has a wall thickness decreased by 20-50% at the gasket, the heating of the cap is to a temperature of 50-110°C, and the electro-magnetic energy has a frequency of 10-200 MHz .
  • the method according to the invention has several advantages over the prior art method.
  • the heating-up of the plastisol can take place in a shorter time interval. A more efficient use of the energy is made.
  • simple and cheap apparatus for generating the electro-magnetic energy can be used.
  • GB-B-1 592 222 mentions the fluxing of a plastisol in a closure by dielectrically heating the plastisol with exposure to a source of radio frequency electrical energy having a frequency in the range of 1-200 MHz and then allowing the fluxed plastisol to cool and form the gasket. From this prior art reference, however, this single feature of the invention is known only in isolation.
  • the fluxing operation is carried out by heating the closure cap after addition of the plastisol to 100°C within 15-30 s and completely fluxing the plastisol shaped into the gasket configuration by 3-15 s exposure to electro-magnetic energy having a frequency to 27,10-27,15 MHz. This frequency is permitted for industrial uses in the whole world.
  • Fig. 1 the wall of the neck of a container made of glass is indicated by 1, and 2 shows the closure cap of polypropylene.
  • On the inside the closure cap is provided with an annular space formed by the two circumferential undercuts 3 and 4, which annular space comprises the gasket 5.
  • the inner undercut 3 is crescent-shaped and is resilient due to the outwardly decreasing thickness of the material.
  • the crescent-shaped construction permits the inner undercut to rest on a part of the edge of the neck opening of the container. As a result thereof a part of the higher unscrewing torsion of the gasket is absorbed and reduced by the undercut.
  • the crescent-shaped undercut 3 ensures that in case of pasteurization of the contents of the container the expanded air generated in that process flows out between the undercut 3, which is thereby resiliently deflicted somewhat, and the edge of the neck whereby the deflected undercut simultaneously causes an additional clamping force to be exerted on the gasket and the gasket is retained in position.
  • Figs. 2-5 show the closure cap of polypropylene at 10, comprising side wall 11 and sealing ring 13 which is connected with side wall 11 via a frangible bridge 12.
  • the neck portion of the container is shown at 14, which neck portion 14 is provided with locking collar 17.
  • a closure cap according to the invention may be sealed after closed a container with it.
  • Fig. 2 in the state before sealing.
  • the side wall 11 with frangible bridges 12 and sealing ring 13 is clear of the container.
  • Fig. 4 shows the situation in which the frangible bridge 12 with the sealing 13, which where previously exposed to the action of hot air having a temperature of 400°C for 2 sec., has been grasped by the clamp 15 moving towards the container.
  • the frangible bridge 12 is then overstretched over and under the locking collar 17 and flattened, the sealing ring 13 also being flattened simultaneously between the clamp 15 and the neck portion 14 of the container.
  • Fig. 5 shows, in comparison with Fig. 3, the deformation experienced by the frangible bridge 12 and the sealing ring 13, which has resulted in that the sealing ring has a diameter smaller than the largest diameter of the locking collar 17.

Abstract

A process for making a closure cap (2) provided with a gasket (5) from a polypropylene material for a container (1), said closure cap (2) comprising an end wall and a circumferential side wall (11), in which process the gasket (5) is formed in the closure cap via a melting and a cooling operation by applying in the closure cap an amount of plastisol which is shaped therein into a gasket configuration at an elevated temperature adjusted after the plastisol addition; causing the plastisol shaped into the gasket configuration to melt completely by further energy supply and then cooling same to form the gasket, whereby starting from an integral combination of the closure cap (2) with a sealing ring (13) which is connected with the closure cap by means of a number of frangible bridges (12) capable of being broken on the first opening of the container, and, to form the gasket (5), carrying out the melting operation by heating the closure cap after addition of the plastisol to a temperature of 50 to 110 DEG C and by exposing the resulting plastisol shaped into the gasket configuration subsequently, as is known per se, to microwave energy until the plastisol has been completely molten.

Description

  • The invention relates to a method for making a container closure cap made of polypropylene and comprising an end wall and a circumferential side wall, the cap comprising a pilfer-proof device, the cap being provided with a gasket made from a plastisol material arranged to seal on the edge of the container neck, the cap being obtained starting from a combination of the closure cap with the pilfer-proof device and adding an amount of the plastisol material, the gasket being formed by heating the closure cap after addition of the plastisol to a chosen temperature and by subsequently exposing the resulting plastisol shaped into the gasket configuration to electro-magnetic energy until the plastisol has completely fluxed,
       the pilfer-proof device being designed as a sealing ring with which the container can be sealably closed in conjunction with a locking collar disposed around the neck of the container, said sealing ring being integrally connected with the side wall of the closure cap via frangible bridges capable of being broken on first opening of the container, said frangible bridges extending in the axial direction of the closure cap,
       the end wall being internally provided with an annular space bounded by an outer undercut,
       the plastisol material being added to that annular space.
  • Such a method and the closure cap made with such method is known from WO-A-84/00346. The method according to the invention is characterized in that said space is also bounded by an inner undercut,
       the end wall has a wall thickness decreased by 20-50% at the gasket,
       the heating of the cap is to a temperature of 50-110°C, and
       the electro-magnetic energy has a frequency of 10-200 MHz .
  • The method according to the invention has several advantages over the prior art method. The heating-up of the plastisol can take place in a shorter time interval. A more efficient use of the energy is made. Furthermore, simple and cheap apparatus for generating the electro-magnetic energy can be used.
  • It is noted that from the mentioned prior art reference, WO-A-84/00346, the use of an inner undercut is per se known. Such inner undercut, however, is not disclosed in combination with the pilfer-proof device.
  • It should furthermore be noted that GB-B-1 592 222 mentions the fluxing of a plastisol in a closure by dielectrically heating the plastisol with exposure to a source of radio frequency electrical energy having a frequency in the range of 1-200 MHz and then allowing the fluxed plastisol to cool and form the gasket. From this prior art reference, however, this single feature of the invention is known only in isolation.
  • Conveniently the fluxing operation is carried out by heating the closure cap after addition of the plastisol to 100°C within 15-30 s and completely fluxing the plastisol shaped into the gasket configuration by 3-15 s exposure to electro-magnetic energy having a frequency to 27,10-27,15 MHz. This frequency is permitted for industrial uses in the whole world.
  • The invention will be further illustrated by means of the drawing which shows an example of embodiment of the closure cap and the method of sealing it. In the drawing
    • Fig. 1 schematically shows an axial cross-section of a container closed with the closure cap;
    • Fig. 2 schematically shows an axial cross-section of a container closed with the closure cap and provided with a sealing ring, in the pre-sealed state;
    • Fig. 3 shows a cross-section along the line III-III in Fig. 2;
    • Fig. 4 shows, in cross-section, the assembly of closure cap and container according to Fig. 2 during sealing with the use of a so-called clamp; and
    • Fig. 5 shows a cross-section along the line V-V in Fig. 4, without the clamp and the container.
  • In Fig. 1 the wall of the neck of a container made of glass is indicated by 1, and 2 shows the closure cap of polypropylene. On the inside the closure cap is provided with an annular space formed by the two circumferential undercuts 3 and 4, which annular space comprises the gasket 5. The inner undercut 3 is crescent-shaped and is resilient due to the outwardly decreasing thickness of the material. The crescent-shaped construction permits the inner undercut to rest on a part of the edge of the neck opening of the container. As a result thereof a part of the higher unscrewing torsion of the gasket is absorbed and reduced by the undercut. Moreover, the crescent-shaped undercut 3 ensures that in case of pasteurization of the contents of the container the expanded air generated in that process flows out between the undercut 3, which is thereby resiliently deflicted somewhat, and the edge of the neck whereby the deflected undercut simultaneously causes an additional clamping force to be exerted on the gasket and the gasket is retained in position.
  • Figs. 2-5 show the closure cap of polypropylene at 10, comprising side wall 11 and sealing ring 13 which is connected with side wall 11 via a frangible bridge 12. The neck portion of the container is shown at 14, which neck portion 14 is provided with locking collar 17.
  • In Figs. 2-5 it is shown by way of an example below a closure cap according to the invention may be sealed after closed a container with it. As shown in Fig. 2 in the state before sealing. The side wall 11 with frangible bridges 12 and sealing ring 13 is clear of the container.
  • Fig. 4 shows the situation in which the frangible bridge 12 with the sealing 13, which where previously exposed to the action of hot air having a temperature of 400°C for 2 sec., has been grasped by the clamp 15 moving towards the container. The frangible bridge 12 is then overstretched over and under the locking collar 17 and flattened, the sealing ring 13 also being flattened simultaneously between the clamp 15 and the neck portion 14 of the container. Fig. 5 shows, in comparison with Fig. 3, the deformation experienced by the frangible bridge 12 and the sealing ring 13, which has resulted in that the sealing ring has a diameter smaller than the largest diameter of the locking collar 17. When the closure cap is unscrewed, an axial shift of the closure cap 10 is blocked by abutment of the sealing ring 13 against the locking collar 17. When the unscrewing movement is continued, the increasing force exerted by the locking collar 17 on the combination of sealing ring 13 and frangible bridge 12 will result in that the frangible bridge 12 weakened by overstretching and flattening, which is made of the per se tough polypropylene, is broken along the line of fracture 16 (Fig. 5).

Claims (3)

  1. A method for making a container (1) closure cap (2) made of polypropylene and comprising an end wall and a circumferential side wall, the cap comprising a pilfer-proof device (12, 13), the cap (2) being provided with a gasket (5) made from a plastisol material arranged to seal on the edge of the container neck (14), the cap (2) being obtained starting from a combination of the closure cap (2) with the pilfer-proof device (12, 13) and adding an amount of the plastisol material, the gasket (5) being formed by heating the closure cap (2) after addition of the plastisol to a chosen temperature and by subsequently exposing the resulting plastisol shaped into the gasket (5) configuration to electro-magnetic energy until the plastisol has completely fluxed,
       the pilfer-proof device (12, 13) being designed as a sealing ring (13) with which the container (1) can be sealably closed in conjunction with a locking collar (17) disposed around the neck (14) of the container (1), said sealing ring (13) being integrally connected with the side wall of the closure cap (2) via frangible bridges (12) capable of being broken on first opening of the container (1), said frangible bridges (12) extending in the axial direction of the closure cap (2),
       the end wall being internally provided with an annular space bounded by an outer undercut (4),
       the plastisol material being added to that annular space,
        characterized in that
       said space is also bounded by an inner undercut (3),
       the end wall has a wall thickness decreased by 20-50% at the gasket,
       the heating of the cap is to a temperature of 50-110°C, and
       the electro-magnetic energy has a frequency of 10-200 MHz .
  2. The method of claim 1
        characterized in that
       the method is carried out in a way such that the inner undercut (3) is tapered in cross-section and resilient and has a largest diameter to have the sealing of the gasket (5) on the edge of the container neck (1) partly in combination with the said undercut (3).
  3. The method of claim 1 or 2
        characterized in that
       the method is carried out in a way such that the inner diameter of the closure cap (10) is up to 100 mm.
EP85200149A 1984-02-09 1985-02-07 A closure cap provided with a gasket and a sealing ring from an olefin polymer Expired - Lifetime EP0155021B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85200149T ATE34148T1 (en) 1984-02-09 1985-02-07 POLYPROPYLENE CAP WITH SEAL AND GUARANTEE STRIP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8400428 1984-02-09
NL8400428A NL8400428A (en) 1984-02-09 1984-02-09 METHOD FOR MANUFACTURING A SEALING CAP WITH A SEALING GASKET FROM A POLYPROPENE MATERIAL FOR A CONTAINER; Sealing cap provided with an olefin polymer, as well as a method for closing and sealing a container with a sealing cap made from polypropylene material.

Publications (3)

Publication Number Publication Date
EP0155021A1 EP0155021A1 (en) 1985-09-18
EP0155021B1 EP0155021B1 (en) 1988-05-11
EP0155021B2 true EP0155021B2 (en) 1994-03-02

Family

ID=19843469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85200149A Expired - Lifetime EP0155021B2 (en) 1984-02-09 1985-02-07 A closure cap provided with a gasket and a sealing ring from an olefin polymer

Country Status (11)

Country Link
EP (1) EP0155021B2 (en)
JP (1) JP2545207B2 (en)
AT (1) ATE34148T1 (en)
CA (1) CA1292443C (en)
DE (1) DE3562601D1 (en)
DK (1) DK61285A (en)
ES (1) ES8606173A1 (en)
GR (1) GR850303B (en)
IN (1) IN162719B (en)
NL (1) NL8400428A (en)
ZA (1) ZA85865B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE939052C (en) * 1948-12-14 1956-02-16 Anton Springer Borehole inoculation device for wood protection
US4675139A (en) * 1985-10-21 1987-06-23 Continental Can Company, Inc. Method of forming plastisol gaskets in container closures fabricated from synthetic plastic resins
GB2186558A (en) * 1986-02-17 1987-08-19 Grace W R & Co Container closure
IT1232058B (en) * 1989-03-29 1992-01-23 Alplast Spa SCREW CAPS OF THERMOPLASTIC MATERIAL
GB2252267A (en) * 1991-01-31 1992-08-05 Grace W R & Co Curing of plastisol liner material in thermoplastic closure
US6142325A (en) * 1998-10-19 2000-11-07 Playtex Products, Inc. Container assembly and bottom cap therefor
FR2822810B1 (en) * 2001-03-28 2003-08-22 Rical Sa CAPPING DEVICE FOR A CONTAINER, PROVIDED WITH HOLDING AND LOCKING MEANS OF A CAST OR MOLD JOINT, AND METHOD FOR PRODUCING THE SAME
JP4994172B2 (en) * 2007-09-26 2012-08-08 日本クラウンコルク株式会社 Cap for container
WO2012028577A1 (en) * 2010-08-30 2012-03-08 Tetra Laval Holdings & Finance S.A. Sealing cap
CN108910251A (en) * 2018-08-02 2018-11-30 宁国市双阳精密制造有限公司 A kind of wear-resistant material production and sales box for material circulation
GB2579839B (en) * 2018-12-17 2021-09-15 Crown Packaging Tech Low migration container

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR66059B (en) * 1977-01-28 1981-01-14 Continental Group
GR72763B (en) * 1980-02-14 1983-12-02 Obrist Ag Albert
ZA831232B (en) * 1982-03-10 1983-11-30 Grace W R & Co Screw cap
GB2116529B (en) * 1982-03-10 1985-07-17 Grace W R & Co Screw closure
JPS5915059A (en) * 1982-07-06 1984-01-26 日本クラウンコルク株式会社 Vessel cover made of synthetic resin
WO1984000346A1 (en) * 1982-07-09 1984-02-02 Metal Closures Group Plc Improvements in closures for screw-threaded containers

Also Published As

Publication number Publication date
IN162719B (en) 1988-07-02
JPS60204473A (en) 1985-10-16
DE3562601D1 (en) 1988-06-16
DK61285A (en) 1985-08-10
GR850303B (en) 1985-04-03
NL8400428A (en) 1985-09-02
AU3856485A (en) 1985-08-15
EP0155021A1 (en) 1985-09-18
ES540171A0 (en) 1986-04-16
CA1292443C (en) 1991-11-26
JP2545207B2 (en) 1996-10-16
AU580751B2 (en) 1989-02-02
ES8606173A1 (en) 1986-04-16
DK61285D0 (en) 1985-02-08
ATE34148T1 (en) 1988-05-15
EP0155021B1 (en) 1988-05-11
ZA85865B (en) 1985-10-30

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