US3092280A - Crown caps - Google Patents

Crown caps Download PDF

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Publication number
US3092280A
US3092280A US818753A US81875359A US3092280A US 3092280 A US3092280 A US 3092280A US 818753 A US818753 A US 818753A US 81875359 A US81875359 A US 81875359A US 3092280 A US3092280 A US 3092280A
Authority
US
United States
Prior art keywords
cap
compound
sealing
bottle
skirt
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
US818753A
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English (en)
Inventor
Ford Ralph Ewart
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.)
Fords (Finsbury) Ltd
Fords Ltd
Original Assignee
Fords Ltd
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 Fords Ltd filed Critical Fords Ltd
Application granted granted Critical
Publication of US3092280A publication Critical patent/US3092280A/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
    • 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
    • B65D41/10—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts
    • B65D41/12—Caps or cap-like covers adapted to be secured in position by permanent deformation of the wall-engaging parts made of relatively stiff metallic materials, e.g. crown caps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps
    • B21D51/48—Making crown caps

Definitions

  • the invention relates to a crown cap made from aluminium or an aluminium alloy (hereinafter referred to as aluminium) which is suitable for closing and sealing a bottle containing a liquid under pressure, such as beer or an aerated mineral water, or a liquid which is heated after the crown cap has been applied in order to sterilise or pasteurise the contents of the bottle, such as sterilised milk or pasteurised fruit juice drinks.
  • aluminium aluminium or an aluminium alloy
  • the conventional crown cap in use to-day consists of a cap made of tinplate with a top portion and a corrugated skirt, the cap being fitted with a cork disc which, when the corrugated skirt is crimped beneath the rim flange or locking ring around the bottle neck, seals against the top of the bottle.
  • the cork disc has been replaced by a disc or annulus of a resilient plastic material, such as polythene, which may be formed with annnular ridges on its surface for increasing the resilience of the seal against the top of the bottle.
  • the inside of the top of the cap has been covered entirely with, or only partly by an annulus of, a flowed-in resilient sealing compound which adheres firmly to the underside of the top portion of the cap and is compressed against the top of the bottle when the corrugated skirt is crimped around the rim flange.
  • the sealing gasket is formed of a flowed-in sealing compound
  • the compound is generally located in a recess or channel formed around the periphery of the underside of the top portion of the cap in order to prevent the compound from plastically flowing away from the sealing position under the applied sealing pressure.
  • the present invention has for its object to provide a crown cap having a sealing gasket which is so disposed in and assembled to the metal cap that the gas pressure within the bottle acts on the sealing gasket to maintain the tightness of the seal.
  • the present invention consists in a crown cap made of metal, preferably aluminium, having a top portion and a corrugated skirt portion which is adapted to be crimped on to the rim flange around the neck of a bottle, said cap having an annular sealing gasket of a resilient or deformable sealing compound, such as a rubberised compound, applied around the interior of the corner Zone of the cap between the top portion and the skirt portion, wherein the sealing gasket, the internal diameter of which is greater than the diameter of the bore of the neck of the bottle, does not firmly adhere to the interior of the cap and is adapted, under the internal gas pressures exerted thereon after the cap has been secured on the bottle, to move or deform by sliding or slipping of the compound against the top and skirt portions of the cap and thereby to effect self-sealing of the cap on the bottle.
  • a resilient or deformable sealing compound such as a rubberised compound
  • the compound is applied on to a coating, previously applied on the interior surface of the cap, of a material to which the compound does not adhere.
  • a crown cap according to this invention When a crown cap according to this invention is crimped on to a bottle, the ring of sealing compound is compressed against the upper peripheral zone of the rim flange, and by reason of the compound not adhering to the cap, the gas pressure within the bottle can move the compound to effect sealing of any spaces which might exist after crimping or which may be produced by any lifting or doming of the cap due to any increased pressure which may subsequently be produced in the bottle.
  • the cap is thus self-sealing and does not have to be sealed on the bottle with the application of such a heavy downward pressure on the bottle neck as is necessary with conventional crown caps.
  • the invention also consists in the methods of making crown caps as hereinafter described.
  • FIGURE 1 is a perspective view from above of a crown cap according to the invention
  • FIGURE 2 is a perspective view from below of the cap of FIGURE 1,
  • FIGURE 3 is a section through a bottle neck with the cap in position thereon, showing the cap before crimping
  • FIGURE 4 is a similar section showing the cap after crimping on to the bottle
  • FIGURE 5 is a section through a bottle neck having a cap of modified construction sealed thereon, before crimping,
  • FIGURE 6 is a similar view to FIGURE 5 but showing the cap after crimping.
  • the cap 1 is punched from sheet or strip aluminium (such as the aluminium alloy known as BAZl supplied by British Aluminium Ltd. or the alloy known as 578 supplied by Northern Aluminium Ltd.), conveniently of about .3 mm. thickness, and is formed to provide the top portion 2 and the downwardly depending corrugated ski-rt portion 3, the edge part 4 of the skirt being flared outwardly.
  • a ring 5 of a resilient or deformable sealing compound preferably a rubberised compound.
  • the compound may be flowed-in from a nozzle while rotating the cap.
  • the compound is then solidified, for example by heating which may also effect any vulcanisation which may be necessary, to form an annular sealing gasket.
  • a suitable sealing compound is No. G485 marketed by Dewey and ALmy Limited.
  • the compound is applied either directly on to the sur face of the aluminium or on to a coating which has been previously applied on the inner surface of the cap, the coating being such that the sealing compound does not stick thereto.
  • Suitable non-adhesive coatings for the above-mentioned compound are lacquers made from epoxy-phenolic resins.
  • the quantity of sealing compound applied is so chosen and it is so applied in the corner of the cap that the internal diameter of the sealing gasket is larger than (and even after deformation by being compressed upon sealing the cap on a bottle will be larger than) the diameter of the bore of the bottle neck.
  • a crown cap of the standard diameter of 26 mm. a quantity of 175 to 200 milligrams'of the compound is sufficient to form the sealing gasket.
  • the sealing gasket 5 lies opposite the upper curved peripheral surface 7 of the rim flange 8 of the bottle.
  • the cap 1 is crimped on to the bottle by conventional capping machinery whereby the outer flared part 4 of the skirt is crimped below the rim flange, as shown in FIGURE 4, to hold the cap on the bottle, the sealing gasket 5 thereby being compressed against the curved surface 7 of the rim flange.
  • the metal of the cap forms at the corner between the top portion and the skirt to conform more closely to the curvature of the curved part 7 of the rim flange and thereby assists in compressing the sealing gasket against the curved surface 7 of the rim flange.
  • the compression of the sealing gasket forces the compound both downwardly into the spaces at the upper ends of the channels formed between the internal corrugated surface of the upper end of the skirt and the opposing peripheral surface of the rim flange, and also inwardly around the top of the curved surface 7.
  • the internal gas pressure within the bottle which acts on the gasket as indicated by the arrows A (FIG.
  • this internal pressure can move the gasket slightly to force the compound to fill the upper endsr of the channels formed by the corrugations and also completely to close any gaps between the interior of the corner of the cap and the curved surface 7 on the rim flange, thereby ensuring a gas-tight seal.
  • the crown cap according to this invention is thus selfsealing and automatically compensating for changes of the internal gas pressure.
  • Tests have shown that crown caps constructed as above described according to this invention, and provided with a non-adhering sealing gasket chntaining 175 to 200 milligrams of sealing compound, maintain a gas-tight seal up to a pressure of 12.0 lbs. per square inch.
  • the self-sealing property of the crown cap according to this invention enables the sealing gasket to be formed from a very small quantity of sealing compound, thus achieving economy in manufacture.
  • the length of the skirt of the cap can also be re,-
  • the necessary heat treatment causes the pressure in the bottle to increase, this increased pressure forcing the sealing gasket to maintain the seal in the manner above explained. 'If the temperature of the heat treatment is suflicient to soften the compound slightly, the internal pressure will still force the compound into any gaps between the surface 7 of the rim flange and the cap, and in the upper ends of the corrugations. Upon the bottle and its contents being cooled or allowed to cool, the fiexedtop'portion of the cap 7 retracts and applies greater pressure on to the sealing gasket.
  • epoxy-phenolic resin lacquers provide coatings to which rubberised sealing compounds, such as G485, do not adhere.
  • the non-ad-hesive'coating may be applied directly on to the strip metal from which the cap is to be made.
  • the interior surface of the cap When it is necessary to protect the contents of the bottle from coming into direct contact with the aluminium of the cap, it is preferred to coat the interior surface of the cap with a non-adhesive lacquer as above described before applying the sealing compound. If it be desired that such protection be afforded by a vinyl or other lacquer to which the sealing compound firmly adheres, this .adhesive lacquer is applied only over the central part 9 of the underside of the top portion of the cap within the ring 5, either directly on to the metal or as a'second coating on a non-adhesive coating.
  • the adhesive lacquer may be applied as a circular spot on the metal cap before the sealing compound is applied and of such a size that the sealing compound does not overlie the adhesive lacquer.
  • the adhesive lacquer may be applied after the sealing compound has been applied or substantially simultaneously with its application.
  • the sealing compound is conveniently applied by squirting from a nozzle while the cap is being rotated about a substantially vertical axis and with its skirt facing upwardly
  • the lacquer may be applied either substantially simultaneously or subsequently by placing or dropping a dropof lacquer on to the centre of the cap, the rotation of the cap dis-v tributing the'lacquer by centrifugal force over its internal surface within the ring of sealing compound.
  • the instant at which the drop of lacquer is applied should be so timed that the lacquer will not be distributed by centrifugal force on to any part of the corner zone which is to be covered with sealing compound before the complete ring of sealing compound has been applied.”
  • the lacquer may be applied at a second station in the machine to which the cap is transferred after the sealing compound has been applied.
  • the lacquer and the sealing compound may be cured simultaneously by the subsequent heat treatment.
  • the cap is provided with a second ring of sealing compound which is applied around the interior of the skirt as describedin United States patent application Serial No. 669,004 in such a position that this second ring of sealing compound will be compressed against the underside of the rim flange when the cap is crimped on to a bottle.
  • This embodiment of the invention is illustrated in FIGURES 5 and 6 of the drawing, in which the additional ring of sealing compound is indicated at 10.
  • the ring 10 of sealing compound in contradistinction to the ring 5,must firmly adhere to the skirt so that the region of the skirt to which the ring 10 is applied must have previously been coated with an adhesive lacquer, such as a vinyl lacquer. This lacquer must not, however, extend beneath the ring 5, or alternatively must be covered, where the ring 5 is tobe applied, with a coating of a non-adhesive lacquer.
  • the ring 5 of sealing compound may extend somewhat further towards the centre of the underside of the top portion of the cap than is shown in the drawings but care must be taken that the internal diameter of the sealing gasket is greater than the diameter of the bore of the neck of the bottle, so that the gasket will not be compressed over the lip of the bore which would restrict the free sliding or slipping movement of the gasket and would prevent the internal pressure from being able to force the gasket outwardly to maintain the seal.
  • the cap may be made of oth r metals, such as tinplate.
  • a metal crown cap having a top portion and a corrugated skirt portion which is adapted to be crimped on to the rim flange around the neck of a bottle, said cap having an annular sealing gasket of a resilient sealing compound applied around the interior of the corner zone of the cap between the top portion and the skirt portion, wherein the compound is applied on to a coating, previously applied on the interior surface of the cap, of a material to which the compound does not adhere, the sealing gasket, the internal diameter of which is greater than the diameter of the bore of the neck of the bottle,
  • a crown cap made from aluminium having a top portion and a corrugated skirt which is adapted to be crimped around the underside of the rim flange of a bottle to secure the cap thereon, the cap having a flowed-in sealing ring of a resilient sealing compound applied around the interior of the corner zone of the cap between the top portion and the skirt, wherein the compound is applied on to the surface of a coating of an epoxyphenolic resin which has been previously applied to the surface of the metal, whereby the sealing ring is held in the cap by reason of the close surface contact existing between the ring and the surface of the coating to which it is applied but is nevertheless free to slide on the surface of the coating.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
US818753A 1958-06-11 1959-06-08 Crown caps Expired - Lifetime US3092280A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB1866458 1958-06-11
GB18663/58A GB884126A (en) 1958-06-11 1958-06-11 Improvements in or relating to crown caps
GB2202958 1958-07-09
GB2765358 1958-08-28
GB3778258 1958-11-24

Publications (1)

Publication Number Publication Date
US3092280A true US3092280A (en) 1963-06-04

Family

ID=27516199

Family Applications (1)

Application Number Title Priority Date Filing Date
US818753A Expired - Lifetime US3092280A (en) 1958-06-11 1959-06-08 Crown caps

Country Status (6)

Country Link
US (1) US3092280A (zh)
BE (1) BE579536A (zh)
CH (1) CH370664A (zh)
DE (2) DE1877377U (zh)
GB (1) GB884126A (zh)
NL (1) NL239999A (zh)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216602A (en) * 1962-03-26 1965-11-09 American Flange & Mfg Container and cap therefor
US3273736A (en) * 1962-04-19 1966-09-20 Crown closures
US3380609A (en) * 1966-04-14 1968-04-30 Crown Cork & Seal Co Roll-on crown with ring tab
US3447710A (en) * 1967-08-15 1969-06-03 Grace W R & Co Manually removable tear-type closure elements
US3675805A (en) * 1970-01-21 1972-07-11 Victor Shane Snap open bottle cap
US4337871A (en) * 1979-09-20 1982-07-06 Mauri Brothers & Thomson (Aust.) Pty. Limited Crown closure
USD410355S (en) * 1998-06-15 1999-06-01 Raymond Quinn Seat cushion
US20090186304A1 (en) * 2008-01-22 2009-07-23 Micron Technology, Inc. Gravity and pressure enhanced reflow process to form lens structures
US20100264109A1 (en) * 2006-12-20 2010-10-21 Fabricas Monterrey, S.A.DE C.V. Crown-type metal cap with projection indicating pressure or vacuum, and method for making same
US20110253666A1 (en) * 2010-03-19 2011-10-20 Keller Timothy P Liner-stretching bottle closure body recess and reinforcing insert
US8322549B2 (en) 2008-04-22 2012-12-04 Crown Packaging Technology, Inc. Twist off crown
US20150232236A1 (en) * 2012-09-18 2015-08-20 Fábricas Monterrey, S. A. De C. V. Crown-type metal cap for sealing a metal bottle
CN111907240A (zh) * 2020-07-30 2020-11-10 大冶市劲鹏制盖有限公司 一种瓶盖加工工艺
CN114013780A (zh) * 2021-08-17 2022-02-08 宁波卓荣国际贸易有限公司 一种新型的储物盒

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9103212U1 (de) * 1991-03-15 1991-06-13 DS-Chemie GmbH, 28219 Bremen Polymercompound zur Herstellung von Dichtungselementen für Gefäßverschlüsse
DK0503124T4 (da) * 1991-03-15 2008-07-21 Actega Ds Gmbh Beholderlukke med et tætningselement af en polymerforbindelse
DE4440852C5 (de) * 1994-11-15 2006-02-09 Altmann, Otto, Dipl.-Ing. Verschlußvorrichtung für Flüssigkeitsbehälter, insbesondere Batteriestopfen sowie Verfahren zu deren Herstellung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2327454A (en) * 1939-11-02 1943-08-24 Continental Can Co Padless crown cap
US2444978A (en) * 1944-11-08 1948-07-13 Crown Cork & Seal Co Closure
US2463701A (en) * 1945-06-23 1949-03-08 Fmc Corp Container and closure
US2481111A (en) * 1946-09-05 1949-09-06 Owens Illinois Glass Co Sealed container and cap
US2484039A (en) * 1945-06-06 1949-10-11 Fmc Corp Container and closure
US2528506A (en) * 1947-08-09 1950-11-07 Dewey And Almy Chem Comp Container sealing compositions and method of forming container seals
US2548305A (en) * 1945-07-26 1951-04-10 Gora Lee Corp Machine and method for making sealing closures
US2765943A (en) * 1949-12-30 1956-10-09 Wolff Franz Closures for containers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1047061A (fr) * 1951-12-21 1953-12-10 Perfectionnements aux bouchons et procédés de bouchage
BE517773A (zh) * 1952-04-09
FR1101056A (fr) * 1954-05-21 1955-09-27 Joint annulaire hermétique pour bouchage
FR1101055A (fr) * 1954-05-21 1955-09-27 Bouchon couronne isolant et hermétique
BE553643A (zh) * 1956-02-17

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2327454A (en) * 1939-11-02 1943-08-24 Continental Can Co Padless crown cap
US2444978A (en) * 1944-11-08 1948-07-13 Crown Cork & Seal Co Closure
US2484039A (en) * 1945-06-06 1949-10-11 Fmc Corp Container and closure
US2463701A (en) * 1945-06-23 1949-03-08 Fmc Corp Container and closure
US2548305A (en) * 1945-07-26 1951-04-10 Gora Lee Corp Machine and method for making sealing closures
US2481111A (en) * 1946-09-05 1949-09-06 Owens Illinois Glass Co Sealed container and cap
US2528506A (en) * 1947-08-09 1950-11-07 Dewey And Almy Chem Comp Container sealing compositions and method of forming container seals
US2765943A (en) * 1949-12-30 1956-10-09 Wolff Franz Closures for containers

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216602A (en) * 1962-03-26 1965-11-09 American Flange & Mfg Container and cap therefor
US3273736A (en) * 1962-04-19 1966-09-20 Crown closures
US3380609A (en) * 1966-04-14 1968-04-30 Crown Cork & Seal Co Roll-on crown with ring tab
US3447710A (en) * 1967-08-15 1969-06-03 Grace W R & Co Manually removable tear-type closure elements
US3675805A (en) * 1970-01-21 1972-07-11 Victor Shane Snap open bottle cap
US4337871A (en) * 1979-09-20 1982-07-06 Mauri Brothers & Thomson (Aust.) Pty. Limited Crown closure
USD410355S (en) * 1998-06-15 1999-06-01 Raymond Quinn Seat cushion
US20100264109A1 (en) * 2006-12-20 2010-10-21 Fabricas Monterrey, S.A.DE C.V. Crown-type metal cap with projection indicating pressure or vacuum, and method for making same
US20090186304A1 (en) * 2008-01-22 2009-07-23 Micron Technology, Inc. Gravity and pressure enhanced reflow process to form lens structures
US8322549B2 (en) 2008-04-22 2012-12-04 Crown Packaging Technology, Inc. Twist off crown
US20110253666A1 (en) * 2010-03-19 2011-10-20 Keller Timothy P Liner-stretching bottle closure body recess and reinforcing insert
US20150232236A1 (en) * 2012-09-18 2015-08-20 Fábricas Monterrey, S. A. De C. V. Crown-type metal cap for sealing a metal bottle
US10183787B2 (en) * 2012-09-18 2019-01-22 Fabricas Monterrey, S.A. De C.V. Crown-type metal cap for sealing a metal bottle
CN111907240A (zh) * 2020-07-30 2020-11-10 大冶市劲鹏制盖有限公司 一种瓶盖加工工艺
CN114013780A (zh) * 2021-08-17 2022-02-08 宁波卓荣国际贸易有限公司 一种新型的储物盒
CN114013780B (zh) * 2021-08-17 2024-05-28 宁波卓荣国际贸易有限公司 一种新型的储物盒

Also Published As

Publication number Publication date
DE1877377U (de) 1963-08-08
GB884126A (en) 1961-12-06
DE1141905B (de) 1962-12-27
CH370664A (de) 1963-07-15
NL239999A (zh)
BE579536A (fr) 1959-10-01

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