EP0055916B1 - Verschluss - Google Patents

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Publication number
EP0055916B1
EP0055916B1 EP19810306052 EP81306052A EP0055916B1 EP 0055916 B1 EP0055916 B1 EP 0055916B1 EP 19810306052 EP19810306052 EP 19810306052 EP 81306052 A EP81306052 A EP 81306052A EP 0055916 B1 EP0055916 B1 EP 0055916B1
Authority
EP
European Patent Office
Prior art keywords
closure
liner
container
annular
top wall
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
EP19810306052
Other languages
English (en)
French (fr)
Other versions
EP0055916A1 (de
Inventor
Werner R. Luenser
Efrem M. Ostrowsky
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.)
Crown Cork and Seal Co Inc
Original Assignee
Tredegar Molded Products Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26913194&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0055916(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Tredegar Molded Products Co filed Critical Tredegar Molded Products Co
Publication of EP0055916A1 publication Critical patent/EP0055916A1/de
Application granted granted Critical
Publication of EP0055916B1 publication Critical patent/EP0055916B1/de
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
    • 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
    • B65D41/045—Discs

Definitions

  • the invention relates to a thermoplastic closure according to the preamble of claim 1.
  • a closure is known from AU-B-510 121.
  • crown closure For many years it has been general practice to utilize bottles which are sealed by means of the so-called crown closure to package products which effect a positive pressure in the bottles. Exemplary of such products are carbonated beverages such as beer.
  • the crown closure is commonly made of tinplate and its fluted skirt is engaged under a peripheral rib which extends around the neck of the bottle in close proximity to its mouth.
  • the crown closure suffers from two defects, namely, it requires a special tool to remove it from the bottle and it cannot be used to reclose the bottle.
  • non-returnable bottles have come into more general use and these have been adopted for some carbonated beverages.
  • non-returnable bottles it is practicable to adopt the most convenient form of closure consistent with economy in price.
  • the most widely employed form of non-returnable bottle system for carbonated beverages has employed a bottle with a externally screw- threaded neck, having a cylindrical sealing surface between the top of the bottle and the start of the thread. With this bottle there has been employed a closure in the form of an aluminum shell having a gasket covering the inner surface of the top of the shell which forms a sealing liner.
  • the diameter of the skirt of the closure shell is sufficiently large to fit over the thread on the bottle neck at the maximum size allowed by the range of tolerances set out in the specification of the neck finish of the bottle.
  • the skirt of this shell is deformed by a thread-rolling operation carried out in known way to bring it into engagement with the thread on the bottle neck.
  • GB-A-683 521 discloses a metallic two-piece closure having a liner which forms a seal at the top of a container lip and against the side surface of the neck of the container.
  • the British specification is concerned with problems in forming metal closure blanks onto a container, and not with the subject of the present invention, thermoplastic closures which are preformed and then applied to the container.
  • DE-C-875 454 discloses a preformed closure having a cured-in-place plastics liner engageed with thread surfaces inside the closure and held by projections and depressions on the inner surface of the top of the closure.
  • AU-B-510 121 discloses a tamper-resistent thermoplastic closure having a resilient liner and threads having locking means. The closure is engaged with threads on a container neck and upon rotation of the closure its axial movement towards the container lip compresses the resilient finer against the lip.
  • thermoplastic material A high promising alternative to the use of aluminum closures is the use of closures made of thermoplastic material. Such materials are becoming more and more economically favorable when compared to aluminum. Exemplary of such closures is the one shown in U.S. 3,067,900.
  • thermoplastic material there is one serious drawback, i.e., the tendency of thermoplastic closures to lose their seal as positive pressure builds in the bottle. Since the seal is made by the closure making sealing contact with the bottle, the loss of seal is generally due to the closure flexing, as the pressure builds, resulting in the closure structure being distorted and pulled away from the bottle. To prevent flexing, it is possible to select a very rigid thermoplastic material.
  • thermoplastic closure which is capable of maintaining a seal in response to a positive pressure in a container such as a bottle.
  • thermoplastic closure for fitment to a container having a threaded neck terminating in a lip which defines an open mouth, said closure comprising:
  • This invention relates to a thermoplastic closure for fitment to a container having a threaded neck terminating in an open mouth.
  • the closure has a circular top wall and an annular downwardly depending skirt, the skirt having about its inside surface a closure thread for cooperation with the neck thread to achieve the fitment desired.
  • annular structure which is located adjacent the inside intersection of the top wall and the skirt. This annular structure has a configuration such that it presses the liner around the outside edge of the container mouth to form a gas-tight seal when the closure is fitted onto the container.
  • a retaining ring about the inside surface of the skirt which is positioned below the annular structure but above the closure thread. This retaining ring prevents the liner from moving down to the closure thread. Thus, if the liner should fall away from the top wall the retaining ring will prevent it from being separated from the remainder of the closure.
  • annular tap which projects downward from the top wall. This tab will engage the liner and prevent any lateral movement thereof.
  • closure of this invention is not restricted to this theory, that by having the liner wrapped around the outside edge of the container lip a gas-tight seal is maintained even upon upward flexure of the top wall which flexure is caused by positive pressure build-up in the container.
  • the closure When the closure is originally fitted to the container there are two principal sealing areas, i.e., there is a seal formed between the liner and the top of the container lip and a second seal formed between the outside edge of the lip and the liner.
  • the closure top wall begins to flex upwardly in response to positive pressure in the container the first seal between the liner and the top of the container lip is compromised as the liner is no longer as well supported due to upward flex of the top wall.
  • the upward flexing of the top wall increases the fidelity of the second seal as that portion of the liner which is wrapped aound the outside edge of the container lip is pressed into a tighter relationship with the outside edge.
  • the closure of this invention utilizes the heretofore undesirable flexing of the top wall to increase the fidelity of the seal. This is directly opposite to present-day closures in which the upward flexing of the top wall results in a reduction in seal fidelity.
  • the annular structure can have a configuration, when viewed in cross-section, which has a horizontal portion, a vertical portion, and a convex portion, the convex portion connecting the horizontal portion and the vertical portion one to the other.
  • a concentration of sealing pressure at a point near the center of the convex portion is one in which the annular structure is a convex bead.
  • the pressure exerted by the annular structure is distributed over a wider area of the liner than is the case with the just-described annular structure having the horizontal, vertical and convex portions.
  • the closure of this invention utilizes a liner which is free to rotate with respect to the closure. This freedom to rotate results in the liner being able to achieve essentially a single position on the container lip even though the closure continues to rotate as it is tightened to the container. If the liner was fixed to the closure, the opposite effect would occur as the liner would have to rotate along with the closure as it is tightened to the container. Liner rotation with respect to the container lip results in the liner being rubbed over the lip surface as it rotates with the closure.
  • the liner utilized should also be flexible and resilient. Furthermore, since the closure of this invention is to be utilized on either glass or plastic containers, the liner should be made of a material which is compatible with the container to which the closure is attached. For example, liners made of materials which stick to the container lip should be avoided as unscrewing the closure from the container will be difficult and, even if achieved, could result in tearing of the liner. It has been found that liners made of an ethylene vinyl acetate copolymer gives superior results on both glass and plastic containers. Further, such liners are acceptable from a toxicological and odor standpoint when the container is utilized to hold consumable products such as carbonated beverages, beer, etc.
  • the container is to hold a non-consumable, other materials may be utilized such as polyvinyl chloride.
  • polyvinyl chloride e.g. polyvinyl chloride
  • a slip additive such as synthetic wax or fatty amide have been found very useful for this purpose.
  • the remainder of the closure can be made of any moldable thermoplastic material which will provide the prior-described characteristics for the top wall of the closure.
  • the thermoplastic material should not be so flexible that, under building positive container pressure, the sidewall of the closure will flex outwardly resulting in the closure threads jumping over the container threads.
  • a highly preferred thermoplastic material is polypropylene.
  • Other thermoplastic materials which may be useful are polyethylene terephthalate, high density polyethylene, nylon, polyvinyl chloride, etc. Other materials which would be useful are well known to those skilled in the art given the preceding identified criteria.
  • a closure generally designated by the numeral 10
  • Container neck 8 has about its outside surface adjacent its upper end helical thread 26.
  • Lip 15 defines the boundaries of the container mouth.
  • the container with which closure 10 is utilized can be made of any suitable material, e.g, glass or a thermoplastic material such as polyethylene terephthalate, polyethylene, polyvinyl chloride, etc.
  • Closure 10 has an annular top wall 12 with a sidewall 14 downwardly depending therefrom. About the inside surface of sidewall 14 there is provided helical closure thread 16 which is of a design whereby it cooperates with container helical thread 26 to achieve fitment of closure 10 to the container. In close proximity to top wall 12 there is provided liner 18. Liner 18 has a diameter greater than the outside diameter of container neck 8 measured at the container mouth. By having a greater diameter, line 18 will be able to extend around the outside edge 28 of lip 15 to effect the seal of this invention. Liner 18 is prevented from moving away from top wall 12 by means of annular ring 24. Annular ring 24 may be continuous or discontinuous. Attention is drawn to Figure 5 in which a discontinuous annular retaining ring 24 is shown.
  • annular tab 22 Projecting downwardly from top wall 12 there is provided annular tab 22.
  • Annular tab 22 has a triangular shape when viewed in cross-section. See Figures 3, 6 and 7. As mentioned previously, annular tab 22 is utilized to insure that liner 18 does not move laterally during the buildup of internal container pressure. Note that annular tab 22 is positioned so that it is over lip 15. By having annular tab 22 so positioned, it is assured that annular tab 22 will obtain a grip on liner 18 by penetration.
  • annular bead 20 Located adjacent the inside intersection of top wall 12 and downwardly deponding sidewall 14 there is provided annular bead 20.
  • An enlarged view of the cross-section of annular bead 20 is shown in Figure 3.
  • annular bead 20 has a horizontal portion 21 and a vertical portion 23.
  • Convex portion 25 connects horizontal portion 21 to vertical portion 23.
  • Convex portion 25 is preferably opposite the outside edge 28 of lip 15.
  • annular bead 40 is used in place of annular bead 20.
  • Annular bead 40 has, for all practical purposes, no horizontal or vertical portions, but rather is simply a convex bead.
  • Figures 3 and 6 show that the annular beads press against liner 18 to cause it to wrap around outside edge 28 of lip 15.
  • top wall 12 is flexed upwards due to pressure in the container the intersection of top wall 12 and sidewall 14 is brought inwardly towards outside edge 28.
  • the annular bead since it is integral with the intersection, will also move inwardly towards outside edge 28.
  • liner 18 is pressed by the annular bead so that it wraps around outside edge 28.
  • the greater the flexure of top wall 12 the greater the inward movement of the before-mentioned intersection and the annular bead, and the further the annular bead is forced to move inwardly the greaterthe pressure it exerts on liner 18. It can therefore be seen that the seal between liner 18 and outside edge 28 is increased as the pressure grows since the top wall flexes in response to the amount of pressure present.

Claims (10)

1. Thermoplastischer Verschluß zum Anbringen an einem Behälter, der einen gewindetragenden Hals (8) besitzt, der in einer lippe (15) endet, die eine offene Mündung begrenzt, wobei der Verschluß (10)
a. eine kreisförmige Decke (12) besitzt; ferner
b. einen ringförmigen Mantel (14), der sich von der Decke (12) abwärts erstreckt und auf seiner Innenwandung mit einem umlaufenden Verschlußgewinde (16) versehen ist, das zum Anbringen des Verschlusses mit dem Halsgewinde (26) zusammenwirken kann; und
c. eine im Bereich der Decke (12) angeordnete, kriesförmige, flexible, elastische Auflage (18), deren Durchmesser größer ist als der Außendurchmesser der Lippe (15), gekennzeichnet durch
d. einen im Bereich der innen angeordneten Schnittlinie zwischen der Decke (12) und dem Mantel (14) angeordneten, ringformigen Vorsprung (20,40), der eine solche Form hat, daß der ringförmige Vorsprung (20, 401 die Auflage (18) um den Außenrand der Lippe (15) herum unter Bildung einer gasdichten Abdichtung gegen die Lippe (15) drückt, wenn der Verschluß (10) an dem Behälter angebracht ist.
2. Verschluß nach Anspruch 1. dadurch gekennzeichnet, daß der ringförmige Vorsprung (20) ein Ringwulst ist, der im Querschnitt gesehen einen horizontalen Teil (21), einen vertikalen Teil (23) und einen konvexen Teil (25) besitzt, der den horizontalen Teil (21) und den vertikalen Teil (23) miteinander verbindet.
3. Verschluß nach Anspruch 1. dadurch gekennzeichnet, daß der ringförmige Vorsprung eine konvexer Wulst (40) ist.
4. Verschluß nach Anspruch 1, oder 3, dadurch gekennzeichnet, daß der Verschluß 1101 ferner an der Innenwandung des Mantels (14) eine umlaufende Halteeinrichtung (24) besitzt. die unterhalb des ringförmigen Vorsprunges (20.40). aber oberhalb des Verschlußgewindes (16) angeordnet ist und eine Abwärtsbewegung der Auflage (18) zu dem Verschlußgewinde (16) verhindert.
5. Verschluß nach Anspruch 1. 2 oder 3, dadurch gekennzeichnet, daß der Verschluß (10) einen von der Decke (12) abwärts vorstehenden, ringförmigen Fortsatz (22) besitzt, der an der Auflage (18) angreift und ein Wegziehen der Auflage (18) aus ihrer Dichtstellung verhindert.
6. Verschluß nach Anspruch 1, oder 3, dadurch gekennzeichnet, daß der Verschluß (10) aus Polypropylen besteht.
7. Verschluß nach Anspruch 1, oder 3, dadurch gekennzeichnet, daß die Auflage (18) aus einen Ethylenvinylacetat-Copolymer besteht.
8. Verschluß nach Anspruch 1, dadurch gekennzeichnet, daß der ringförmige Vorsprung ein Ringwulst (20), der im Querschnitt gesehen einen horizontalen Teil und einen vertikalen Teil besitzt.
9. Verschluß nach Anspruch 1, oder 3, dadurch gekennzeichnet, daß der Verschluß (10) aus Polypropylen und die Auflage (18) aus einem Ethylenvinylacetat-Copolymer besteht.
EP19810306052 1980-12-22 1981-12-22 Verschluss Expired - Lifetime EP0055916B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US21873580A 1980-12-22 1980-12-22
US218735 1980-12-22
US27178181A 1981-06-08 1981-06-08
US271781 1981-06-08

Publications (2)

Publication Number Publication Date
EP0055916A1 EP0055916A1 (de) 1982-07-14
EP0055916B1 true EP0055916B1 (de) 1990-09-12

Family

ID=26913194

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19820900490 Withdrawn EP0067221A1 (de) 1980-12-22 1981-12-21 Verschluss
EP19810306052 Expired - Lifetime EP0055916B1 (de) 1980-12-22 1981-12-22 Verschluss

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19820900490 Withdrawn EP0067221A1 (de) 1980-12-22 1981-12-21 Verschluss

Country Status (7)

Country Link
EP (2) EP0067221A1 (de)
JP (1) JPS57501998A (de)
AU (2) AU544147B2 (de)
BR (1) BR8108921A (de)
CA (1) CA1168621A (de)
DE (1) DE3177214D1 (de)
WO (1) WO1982002182A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19733636C2 (de) * 1997-08-04 2000-12-14 Weis Kg Schraubverschlußkappe aus Kunststoff

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR8108921A (pt) * 1980-12-22 1982-11-30 Ethyl Prod Fecho
US4381840A (en) * 1981-08-24 1983-05-03 Ethyl Products Company Threaded closure with free-floating liner
GB2116529B (en) * 1982-03-10 1985-07-17 Grace W R & Co Screw closure
ZA831232B (en) * 1982-03-10 1983-11-30 Grace W R & Co Screw cap
AU533823B3 (en) * 1983-06-23 1984-01-05 Lilypak Limited Improvements to plastic closures for carbonated beverages
GB2144110A (en) * 1983-07-27 1985-02-27 Metal Closures Ltd Bottle closure
EP0179498B1 (de) * 1984-10-19 1989-07-12 Lynes Holding S.A. Verfahren zum Abdichten eines Behälters
DE3839351A1 (de) * 1988-11-22 1990-05-31 Berg Jacob Gmbh Co Kg Schraubverschluss fuer flaschen mit entlueftungseinrichtung
FR2722764B1 (fr) * 1994-07-20 1996-10-04 Rical Sa Capsule de bouchage a vis a joint rapporte
GB2321053A (en) * 1997-01-08 1998-07-15 Massmould Holdings Screw cap with liner
EP0987190A1 (de) 1998-09-14 2000-03-22 Crown Cork & Seal Technologies Corporation Verschlusskappe
EP0987191A1 (de) 1998-09-14 2000-03-22 Crown Cork & Seal Technologies Corporation Verschlusskappe
FR2793216B1 (fr) * 1999-04-20 2001-06-08 Pechiney Emballage Alimentaire Capsule de bouchage composite

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2409788A (en) * 1942-10-21 1946-10-22 Aluminum Co Of America Method for applying closures to containers
US2409789A (en) * 1943-09-21 1946-10-22 Aluminum Co Of America Method of sealing containers
US3207350A (en) * 1961-10-20 1965-09-21 Foster M Hagmann Sealing closure for a crown-type bottle
GB1178447A (en) * 1966-09-29 1970-01-21 Grace W R & Co Gasketed Closures for Containers.
GB1384370A (en) * 1971-01-11 1975-02-19 United Glass Ltd Closures for containers

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2130749A (en) * 1931-09-21 1938-09-20 Anchor Cap & Closure Corp Cap and package
US2068389A (en) * 1931-09-21 1937-01-19 Anchor Cap & Closure Corp Closure cap and liner therefor
US2550586A (en) * 1945-10-25 1951-04-24 Sartorius & Co Inc A Bottle, cap, and brush
GB683521A (en) * 1946-11-27 1952-12-03 Aluminum Co Of America Improvements in or relating to closure blanks
DE875454C (de) * 1951-03-06 1953-05-04 Curt Albrecht Verschlusskappe fuer flaschenfoermige Behaelter
US3067900A (en) * 1960-07-28 1962-12-11 Kessler Milton Self-venting pressure-release sealing cap
US3331523A (en) * 1965-02-15 1967-07-18 Gilbert Mfg Company Container closure member and liner therefor
US3462034A (en) * 1967-08-25 1969-08-19 Braun Co W Means for closing and sealing a bottle or container
US3536224A (en) * 1969-07-14 1970-10-27 Kerr Glass Mfg Corp Molded-in liner for a closure
DE2115824A1 (de) * 1970-04-02 1971-10-21 Grace W R & Co Verfahren zur Herstellung von Dichtungen in Behälterverschlüssen
DE2137389A1 (de) * 1971-07-26 1973-02-08 Joseph William Dukess Verschluss
CH597052A5 (en) * 1976-02-16 1978-03-31 Brac Werke Ag Plastics sealing disc for screw-on container closure
AU510121B2 (en) * 1976-05-19 1980-06-12 C. W Cooke Safety cap and container neck
US4151924A (en) * 1977-11-07 1979-05-01 Owens-Illinois, Inc. Liner element for closure cap
BR8108921A (pt) * 1980-12-22 1982-11-30 Ethyl Prod Fecho

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2409788A (en) * 1942-10-21 1946-10-22 Aluminum Co Of America Method for applying closures to containers
US2409789A (en) * 1943-09-21 1946-10-22 Aluminum Co Of America Method of sealing containers
US3207350A (en) * 1961-10-20 1965-09-21 Foster M Hagmann Sealing closure for a crown-type bottle
GB1178447A (en) * 1966-09-29 1970-01-21 Grace W R & Co Gasketed Closures for Containers.
GB1384370A (en) * 1971-01-11 1975-02-19 United Glass Ltd Closures for containers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19733636C2 (de) * 1997-08-04 2000-12-14 Weis Kg Schraubverschlußkappe aus Kunststoff

Also Published As

Publication number Publication date
EP0067221A1 (de) 1982-12-22
AU544147B2 (en) 1985-05-16
EP0055916A1 (de) 1982-07-14
AU8083582A (en) 1982-07-20
BR8108921A (pt) 1982-11-30
DE3177214D1 (de) 1990-10-18
CA1168621A (en) 1984-06-05
JPS57501998A (de) 1982-11-11
AU576885B2 (en) 1988-09-08
AU4616285A (en) 1985-11-21
WO1982002182A1 (en) 1982-07-08

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