US3749272A - Deformable closure for containers - Google Patents

Deformable closure for containers Download PDF

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Publication number
US3749272A
US3749272A US00250995A US3749272DA US3749272A US 3749272 A US3749272 A US 3749272A US 00250995 A US00250995 A US 00250995A US 3749272D A US3749272D A US 3749272DA US 3749272 A US3749272 A US 3749272A
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United States
Prior art keywords
liner
shell
closure
sealing
adherent
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Expired - Lifetime
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US00250995A
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English (en)
Inventor
H Brockett
R Melberg
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.)
Continental Can Co Inc
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Continental Can Co Inc
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Publication date
Application filed by Continental Can Co Inc filed Critical Continental Can Co Inc
Application granted granted Critical
Publication of US3749272A publication Critical patent/US3749272A/en
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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
    • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
    • B65D53/04—Discs

Definitions

  • ABSTRACT A deformable closure for containers of the type having an interior lacquered shell and a sealing liner secured therein.
  • the liner has an outer peripheral annular sealing area and an inner central non-sealing area.
  • the lac quer applied to the shell is composed of a composition to which the liner is poorly adherent.
  • the lacquered shell has applied thereto an adhesion promoting coating which contacts the liner in the non-sealing area and renders the liner portion adherent thereto so that the liner is strongly adherent to the shell in the non-sealing area and poorly adherent to the shell in the sealing area.
  • the closure loosely applied to the container neck is deformed by a sealing head so that a portion of the crown is pressed towards the exterior sides of the mouth portion of the threaded neck whereby portions of the sealing liner are turned inward to form a side seal.
  • This deforming operation is referred to in the art as reforming.
  • the skirt portion of the closure is deformed to effect interengagement thereof with the threaded portion of the neck by means of thread rollers positioned symmetrically about the container which inwardly deform the skirt between adjacent thread ribs on the container neck.
  • Deformable closures of the type described above have been adapted to form tamper-proof closures.
  • the deformable closure forms a removable top portion which is connected to a depending ring portion by means of a series of fracturable bridge members with the retaining ring portion having its lower edge secured'to the container by being crimped under an annular flange portion on the neck of the container.
  • sealing liners secured to the shells of the deformable closures are generally rubber-like resilient materials which are flowable under the pressures to which the closure is subjected to during reforming.
  • Plastisol compositions are preferred and are widely used as sealing linersfor closures as they are easily applied materials characterized by resistance to acids, beverage, and food products and are relatively tasteless and odorless and are not affected by moisture.
  • a serious problem encountered in using plastisol lined deformable closure is that in an undersirable number of cases, the'mounted closure is tilted when reformed on the container neck and when this happens the lower edge of the fracturable ring portion of the closure will not come in full contact with the annular flange during sealing. This phenomenon is referred to' in the art as mis-tucking. Containers sealed with closures which are mis-tucked have an unattractive appearance and have very poor aesthetic appeal to the consumer.
  • a deformableclosure having a resilient liner secured therein and adapted for sealing bottles and like containers wherein the interior shell of the closure is coated with a lacquer layer to which the liner is substantially non-adherent, the central, non-sealing area of the liner being adhered to the lacquered shell surface with an adhesion promoting coating material which is adherent to both the liner and the lacquered shell surface.
  • FIG. 1 is a section view of one form of a deformable closure according to the invention.
  • FIG. 2 is a plan view into the open face of the lacquered closure shell before application of the liner according to the invention.
  • FIG. 3 is a like view with a formed liner in place.
  • FIG. 1 illustrates one form of closure cap 10 according to the invention, the closure 10 being made of permanently deformable material such as tinplate or aluminum and comprising a crown portion 11, a skirt portion 12 and a retaining ring portion 13 formed integrally with the skirt portion 12 and extending downwardly from the lower end of the skirt.
  • permanently deformable material such as tinplate or aluminum
  • the retaining ring portion 13 of the closure 10 is secured to the lower end of the skirt portion by means of a series of fracturable bridge members 14. By securing the retaining ring portion 13 to the cap 10 in this manner, the ring may be easily severed from the cap portion when the cap is twisted relative to the retaining ring.
  • the interior upper face of the cap 10 is coated with an internal lacquer layer 15.
  • the lacquer can be of any material to which a plastisol liner will be substantially non-adherent or adhere with alow order of adhesion.
  • An example of a suitable lacquer is the thermosetting epoxy-vinyl-urea/formaldehyde resin mixtures conventionally used in coating the interior of metal containers.
  • Such a lacquer applied to the metal from which the closure shell is formed and baked at 370 F for l minutes at a film weight of about 2.5 mg/sq. inch provides a protective lacquer coating for the closure shell to which the plastisol liner is poorly adherent.
  • an adhesion promoting material 16 which is adherent to the lacquered surface 15 and to which the subsequently applied plastisol liner will also be adherent.
  • the adhesion promoting coating material 16 is applied to the lacquered surface 15 in any convenient form known to the coating art.
  • the coating material 16 is formulated having the consistency of a printing ink which can be applied to the lacquered surface by high speed printing presses normally employed in the closure art for printing indica on lacquered metal surfaces.
  • the adhesion promoting coating material 16 is applied to or printed on the lacquered closure shell in the form of a circular spot.
  • the adhesion promoting coating material 16 may be formulated from any synthetic resin composition which creates a high order of adhesion between the liner and the lacquered shell.
  • An adhesion promoting coating material which has been found especially suitable for use in the practice of the present invention are plasticized vinyl chloride polymer compositions prepared from a mixture of (l) 30 to 50 weight percent of at least one vinyl chloride polymer resin (2) 40 to 60 weight percent of an epoxidized, unsaturated oil plasticizer and (3) to weight percent of a methacrylate polymer tackifier. These plasticized vinyl chloride polymer compositions are more completely described in U.S. Pat. No. 3,361,381, the disclosure of which is incorporated in this application by reference.
  • a resilient sealing liner 17 consisting of a thick annular portion or sealing ring 18 for engagement with the container lip and a thin central non-sealing portion 19 is provided in the closure shell
  • the sealing liner 17 can be made of any material which provides a resilient liner and which is flowable under the pressures to which the deformable closure is subjected during reforming operations.
  • Suitable'materials from which the liner may be formed include rubber/resin blends, including blends based on neoprene, nitrile, natural, styrene-butadiene, and ethylenepropylene rubbers; vinyl resin compositions, including plastisols of vinyl chloride polymers and blends of vinyl resins, polyurethane rubbers and rubber gaskets prepared from solutions or latices and flowed and solidi fertil in position in the closure shell. These materials may be modified by the addition of various additives to impart desirable properties such fillers, plasticizers, tackifiers, curing agents and antioxidants.
  • Plastisols are preferred as materials from which the sealing liner can be formed.
  • Useful plastisols for the liner composition include 39 to 77 percent by weight of the plastisol of fine granules of vinyl chloride polymers such as polyvinylchloride or copolymers of vinyl chloride with up to about 20 weight percent of a copolymerizable ethylenically unsaturated monomer such as vinyl acetate, maleic anhydride, vinylidene chloride, dibutyl maleate and mixtures of such monomers, the polymer granules being suspended in 18 to 58 percent by weight of the plastisol compositionof a conventional vinyl resin plasticizer such as an alkyl phthalate such as dioctyl phthalate or an epoxidized oil such as epoxidized linseed oil, a dicarboxylic acid ester, a triaryl phosphate or a combination of plasticizers.
  • a conventional vinyl resin plasticizer such as an
  • the plastisol may be deposited in the closure shells by various known techniques, one being the so-called flowed in technique wherein the plastisol composition in an uncured, plastic like condition is squirted from 'one or more nozzles into the closure shells which are turned upside down on a chuck rotating at high speed. Due to centrifugal force, the sealing liner material will assume the desired contour and shape. After being thus deposited or flowed in the liners are cured by a heating operation according to known procedures and using known equipment. The cured liners will permanently adhere to'the lacquered interior of the shell only in those areas to which the adhesion promoting coating has been applied;
  • the closure may be reformed on a container neck to seal the container in the conventional manner and as more particularly described in U.S. Pat. No. 3,465,907 which disclosure is incorporated in this application by reference.
  • EXAMPLE Deformable aluminum closures formed of a shell having an outside diameter of 1.125 inches and a depending skirt having a retaining ring attached thereto of the type illustrated in FIG 1 of the drawings were provided with a layer of an epoxy-vinylurca/formaldehyde resin lacquer over the entire inner shell surface at a film weight of 2.5 mg/sq. inch, and baked at 370 F for minutes.
  • a spot, 0.625 in diameter, of an adhesion promoting coating material having the consistency of a printing ink was applied by a lithographic press over the lacquered surface in the center of the shell at a film weight of 2.5 mg/in as shown in H6. 2 of the drawings. The coating spot was baked at 370 C for 10 minutes.
  • the adhesion promoting coating material had the following composition:
  • Vinyl chloride/maleic 8.3 anhydride copolymer having a carboxyl content of 1.67%
  • Polyvinylchloride resin 100 Epoxidized Soybean Oil 5 Dioctyl Phthalate 60 Calcium-Zinc Stabilizer l Wax 2
  • the plastisol liner was substantially adherent to the closure shell in the central, non-sealing area of the shell to which the adhesion promoting coating spot had been applied and substantially non-adherent to the sealing area of the lacquered shell.
  • the plastisol lined closures were reformed on screw threaded 8 and I0 02 bottles in the manner disclosed in US. Pat. No. 3,465,907 using conventional closing machinesat a rate of 250 bottles per minute. After application of the closures, the bottles are examined for mis-tucks. The number of mistucks per 360 bottles sealed in this manner was 1.
  • a closure for a container comprising a shell adapted for mechanical engagement with the container and extending over the container mouth, the shell having a lacquer layer thereon and containing a resilient sealing liner which is poorly adherent to the lacquer layer,
  • the liner comprising an outer peripheral annular sealing area and an inner central non-sealing area
  • the lacquer layer having applied thereto an adhesion promoting coating which contacts the inner nonsealing area of the liner and which renders the nonsealing area of the liner strongly adherent to the lacquer layer, so that the liner is strongly adherent to the lacquered surface of the shell in the inner non-sealing area of the liner and poorly adherent to the lacquered surface of the shell in the outer peripheral annular sealing area of the liner.
  • sealing liner is formed from a plastisol composition.
  • adhesion promoting coating is comprised of a plasticized vinyl chloride polymer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
US00250995A 1972-05-08 1972-05-08 Deformable closure for containers Expired - Lifetime US3749272A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25099572A 1972-05-08 1972-05-08

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US3749272A true US3749272A (en) 1973-07-31

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US00250995A Expired - Lifetime US3749272A (en) 1972-05-08 1972-05-08 Deformable closure for containers

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US (1) US3749272A (enrdf_load_stackoverflow)
JP (1) JPS5418517Y2 (enrdf_load_stackoverflow)
CA (1) CA992717A (enrdf_load_stackoverflow)
DE (1) DE2305604A1 (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883025A (en) * 1973-04-12 1975-05-13 Grace W R & Co Gaskets for container closures
JPS50112181A (enrdf_load_stackoverflow) * 1974-02-12 1975-09-03
US4327840A (en) * 1978-05-26 1982-05-04 Toyo Seikan Kaisha, Ltd. Metal cap and its method of manufacture
US20060219727A1 (en) * 2003-09-05 2006-10-05 Giraud Jean P Unitary container and flip-top cap assembly having child resistant safety features
US20090206094A1 (en) * 2008-08-01 2009-08-20 Soutullo Paul W Propane gas cylinder assembly
US20150259112A1 (en) * 2010-09-22 2015-09-17 Philip J. Gordon Consultants, Inc. Method of controlling by-products of vitamin c degradation and improving package integrity shelf life
CN106470915A (zh) * 2014-06-27 2017-03-01 日本克乐嘉制盖株式会社 金属盖及其制造方法
US11485549B2 (en) * 2018-07-27 2022-11-01 Daiwa Can Company Cap configured to retain sealing member in cap body

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4503308B2 (ja) * 2004-02-13 2010-07-14 日本クラウンコルク株式会社 金属薄板製容器のための容器蓋
JP2014114055A (ja) * 2012-12-11 2014-06-26 Csi Japan:Kk 金属製キャップ、閉止装置、および飲料入り閉止装置
JP6431582B2 (ja) * 2017-08-21 2018-11-28 ユニバーサル製缶株式会社 キャップ付容器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465907A (en) * 1968-09-10 1969-09-09 Continental Can Co Closure seal for containers having screw threaded necks

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465907A (en) * 1968-09-10 1969-09-09 Continental Can Co Closure seal for containers having screw threaded necks

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883025A (en) * 1973-04-12 1975-05-13 Grace W R & Co Gaskets for container closures
JPS50112181A (enrdf_load_stackoverflow) * 1974-02-12 1975-09-03
US4327840A (en) * 1978-05-26 1982-05-04 Toyo Seikan Kaisha, Ltd. Metal cap and its method of manufacture
US20060219727A1 (en) * 2003-09-05 2006-10-05 Giraud Jean P Unitary container and flip-top cap assembly having child resistant safety features
US8590734B2 (en) * 2003-09-05 2013-11-26 Jean-Pierre Giraud Unitary container and flip-top cap assembly having child resistant safety features
US20090206094A1 (en) * 2008-08-01 2009-08-20 Soutullo Paul W Propane gas cylinder assembly
US20150259112A1 (en) * 2010-09-22 2015-09-17 Philip J. Gordon Consultants, Inc. Method of controlling by-products of vitamin c degradation and improving package integrity shelf life
US10155610B2 (en) * 2010-09-22 2018-12-18 Philip J. Gordon Consultants, Inc. Method of controlling by-products of vitamin C degradation and improving package integrity shelf life
CN106470915A (zh) * 2014-06-27 2017-03-01 日本克乐嘉制盖株式会社 金属盖及其制造方法
US10800585B2 (en) 2014-06-27 2020-10-13 Nippon Closures Co., Ltd. Manufacturing method for metal cap
US11485549B2 (en) * 2018-07-27 2022-11-01 Daiwa Can Company Cap configured to retain sealing member in cap body

Also Published As

Publication number Publication date
DE2305604A1 (de) 1973-11-22
JPS5418517Y2 (enrdf_load_stackoverflow) 1979-07-12
JPS503953U (enrdf_load_stackoverflow) 1975-01-16
CA992717A (en) 1976-07-13

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