US3032826A - Crown closures - Google Patents

Crown closures Download PDF

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Publication number
US3032826A
US3032826A US701682A US70168257A US3032826A US 3032826 A US3032826 A US 3032826A US 701682 A US701682 A US 701682A US 70168257 A US70168257 A US 70168257A US 3032826 A US3032826 A US 3032826A
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Prior art keywords
liner
crown
plastisol composition
plasticizer
blowing agent
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Expired - Lifetime
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US701682A
Inventor
James H Brillinger
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WR Grace and Co
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WR Grace and Co
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Publication date
Priority to BE570550D priority Critical patent/BE570550A/xx
Application filed by WR Grace and Co filed Critical WR Grace and Co
Priority to US701682A priority patent/US3032826A/en
Priority to FR1209584D priority patent/FR1209584A/en
Priority to GB29667/58A priority patent/GB838200A/en
Priority to CH6588158A priority patent/CH362614A/en
Application granted granted Critical
Publication of US3032826A publication Critical patent/US3032826A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/78—Moulding material on one side only of the preformed part
    • B29C70/80—Moulding sealing material into closure members
    • 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
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/06—PVC, i.e. polyvinylchloride
    • 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
    • B29K2055/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0058—Liquid or visquous
    • B29K2105/0061—Gel or sol
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/60—Processes of molding plastisols
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/809—Seal, bottle caps only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1062—Prior to assembly
    • Y10T156/107—Punching and bonding pressure application by punch
    • Y10T156/1072—Closure cap liner applying type

Definitions

  • This invention relates to container closures and to a process of making container closures. More particularly this invention relates to crown closures having a liner composed of a sponge-like plastic with a myriad of cell spaces.
  • cork has been inertthat is, not add to or distract from the natural flavor and odor properties of the contents of the bottle; that it possess good resiliency and sealing efliciency as well as chemical stability and adaptability to mass production methods.
  • natural or compounded cork has been the most widely used material. This is not to say that cork has been found perfect, or for that matter satisfactory in every one of the above characteristics, but rather that it at least has been found to contain the best combinations of properties and that by various modifications certain drawbacks have been overcome to some extent. For example, cork has not been completely satisfactory from the point of view of lack of interaction of the cork with the contents of the bottle.
  • cork liners become discolored, build up gummy deposits and stick to the bottle lips when the crown is removed from the bottle.
  • These disadvantages have been overcome to some extent by the use of thin discs or spots made of aluminum, other metals or plastic coated paper in the center of the cork liner. This spot method, of course, adds to the difliculties and expense of making crown liners of cork.
  • Another objection to the use of cork is that the cork is a natural product, and it cannot always be obtained with uniform characteristics.
  • Liners made of these plastics have not been entirely successful because it has proven diflicult to obtain as good sealing characteristics and pressure retention properties with these liners as is obtained with cork liners. These difliculties are believed to be due to the fact that plastic liners do not possess the property of compressibility, which is found in cork. The compressibility of cork is generally attributed to the numerous pores or cell-like spaces which exist in the material.
  • Liners with very irregular cell structure or cells spaces which extend through the surface do not give good seals because the gases and liquids in the container may Work their Way through and around the liner by way of the openings at the surface or by reason of the fact that the irregularly size spaced result in uneven contact of the liner against the bottle neck.
  • crown cap produced by my invention is shown in perspective section, and is indicated by 1.
  • the liner is 2, with the substantially impervious film at the surface indicated by reference numeral 3.
  • the cellular spaces throughout the liner are indicated at 4- 4.
  • My crown liner is prepared from a blown and fused plastisol composition.
  • the plastisol composition is made up of a vinyl resin, a plasticizer and a blowing agent, with or without fillers and others additives.
  • the composition is flowed onto the inner surface of a metal crown and fluxed by heating. During fluxing a viscous gel is formed and the blowing agent decomposes to produce hundreds of tiny gas cells in the liner.
  • the blowing agent is chosen so as to decompose after the start of fluxing'.
  • the liner is a puffed, rubbery, resilient material. When the crown is placed on a glass container, the liner closely compreses to the configuration of the glass rim and leaves no spaces for leakage.
  • plastisols are dispersions of vinyl resin in a non-volatile plasticizer which have the consistency of a paste. When such a mixture is heated to about 93-l07 C. the paste becomes gel-like and losses its fluidity. As temperatures increase to 177 C. or
  • the gel becomes more viscous and greater in strength.
  • the change in properties of the material is brought about by solution of the resin in the plasticizer as the temperature is increased. Upon cooling the composition becomes a tough, rubbery mass.
  • the plastisol may be made from numerous commercially available thermoplastic materials such as polyvinyl chloride, copolymers of vinylchloride, polyvinyl acetate, copolymers of vinyl acetate, polyvinyl butyrate, polyvinyl alcohols. polyvinylidene chloride, copolymers of vinylidene chloride and polyvinyl aromatic compounds such as polystyrene.
  • the preferred polymer is polyvinyl chloride.
  • blowing agents in my process are chosen so that their decomposition temperature is slightly below the final fluxing temperature of the plastisol composition. A difference between maximum fluxing temperatures and decomposition of the blowing agent of about 15 to 30 C. is satisfactory. By so choosing the blowing agent, it is possible to produce blowing when the plastisol is in a fairly tough gel state; i.e., when it is not so fluid that blowing will cause perforations in the surface of the mass nor so well gelled as to prevent proper expansion of gas. There are numerous blowing agents which are suitable, the choice varying with the particular plastisol composition used.
  • Among those which may be used are sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, diazoamino benzene, dinitrosopentamethvlenetetramine, urea-biuret, bisazo formamide. p.o'-oxvbisbenzene sulfonyl hydrazide and azo isobutyronitrile. I have found the nitrogen evolving compounds to be particularly suitable. Though the quantity of blowing agent may be widely varied from 0.1 to 5.0% depending upon the composition and degree of blowing desired, the best results have been realized using less than 1.5% based on the weight of plastisol mixture.
  • the plasticizer employed may be any of the Well known non-volatile plasticizers for vinyl resins which are known to dissolve the resin at higher temperatures. These include di-2-ethyl hexyl phthalate, di-isooctyl phthalate, acetyl tributyl citrate, di-octyl sebacate, di-hexyl adipate and 2-ethyl hexyl di-phenyl phosphate.
  • the quantity of plasticizer used should be sufficient to form a plastisol of paste-like consistency. Ordinarily the percentage of plasticizer based on the weight of vinyl resin is 60 to 120%, with the preferred amount being from 6595%.
  • various other modifiers are usually desirable, such as lubricants, for example, parafiin wax; wetting agents such as lecithin, propylene glycol laurate, propylene, glycol stearate, zinc resinate, and glycerol mono-oleate; fillers such as talc, wood flour, diatomaceous earth and asbestos; pigments such as carbon black, titanium dioxide, iron oxides and aluminum powder; and stabilizers such as calcium stearate, zinc stearate, organo-tin complexes, epoxy resins and epoxidized oils.
  • lubricants for example, parafiin wax
  • wetting agents such as lecithin, propylene glycol laurate, propylene, glycol stearate, zinc resinate, and glycerol mono-oleate
  • fillers such as talc, wood flour, diatomaceous earth and asbestos
  • pigments such as carbon black, titanium dioxide, iron oxides and aluminum powder
  • stabilizers such as calcium ste
  • a plastisol composition containing the following ingredients was prepared:
  • the plastisol thus produced was applied to a number of metal crowns with a high speed automatic lining machine of the type well known in the industry where the crowns are spun on a revolving chuck beneath a pressure nozzle which expels a small quantity of compound onto each crown.
  • the quantity applied was 0.330 gms. per crown, and the spin of the chuck spread the compound across the inner face of the crown.
  • the crowns so lined were transferred to a 205 C. electric oven with circulating air currents and were heated for one minute. Upon removal from the oven, the crowns were cooled.
  • the liners were tough and rubbery with hundreds of fine cells dispersed throughout.
  • the majority of the cells were non-communicating, while some formed sinuous passages with each other.
  • the exposed surface was substantially impervious.
  • a process of providing a crown cap with a compres sible, cellular liner comprising: forming a fluid plastisol composition containing as essential ingredients a vinyl resin, a plasticizer and a blowing agent having a decomposition temperature slightly below the final fluxing temperature of said plastisol composition, the amount of said plasticizer being in the range of 60% to 120% based on the weight of said vinyl resin and the amount of said blowing agent being in the range of 0.1% to 5.0% by weight based on the weight of said plastisol composition, applying said plastisol composition to the inner surface of a crown cap with a high speed lining machine wherein less than 0.40 gram of said plastisol composition is placed within said crown cap while said crown cap is spinning and thereby spread across the inner face of said crown cap, said spinning being the only method used to configure said cellular liner; heating said crown cap so lined to a temperature above about 177 C. to transform said plastisol composition into a viscous gel and decompose said blowing agent,
  • a process of providing a crown cap with a compressible, cellular liner comprising: forming a fluid plastisol composition containing as essential ingredients a vinyl resin, a plasticizer and a blowing agent having a decomposition temperature about 15 to 30 C. below the final fiuxing temperature of said plastisol composition, the amount of said plasticizer being in the range of 65% and 95% based on the weight of said vinyl resin and the amount of said blowing agent being less than 1.5% by weight based on the weight of said plastisol composition;

Description

May 8, 1962 J. H. BRILLINGER CROWN CLOSURES Filed Dec. 9, 1957 Uite rates This invention relates to container closures and to a process of making container closures. More particularly this invention relates to crown closures having a liner composed of a sponge-like plastic with a myriad of cell spaces.
In seeking satisfactory materials for crown liners the industry has been guided by several requirements. Among these are that the material be inertthat is, not add to or distract from the natural flavor and odor properties of the contents of the bottle; that it possess good resiliency and sealing efliciency as well as chemical stability and adaptability to mass production methods. For many years natural or compounded cork has been the most widely used material. This is not to say that cork has been found perfect, or for that matter satisfactory in every one of the above characteristics, but rather that it at least has been found to contain the best combinations of properties and that by various modifications certain drawbacks have been overcome to some extent. For example, cork has not been completely satisfactory from the point of view of lack of interaction of the cork with the contents of the bottle. Often, especially after long storage times, it is found that cork liners become discolored, build up gummy deposits and stick to the bottle lips when the crown is removed from the bottle. These disadvantages have been overcome to some extent by the use of thin discs or spots made of aluminum, other metals or plastic coated paper in the center of the cork liner. This spot method, of course, adds to the difliculties and expense of making crown liners of cork. Another objection to the use of cork is that the cork is a natural product, and it cannot always be obtained with uniform characteristics.
In view of these drawbacks, there have been many attempts to produce cork substitutes. Among the numerous materials tried have been various modifications of corn stalks, peanut hulls, cellulosic materials and glue compositions. More recently a promising material has been found in the form of vinyl resin plastics. These plastics have the advantages of stability, good flavor and odor characteristics, and adaptability to mass production methods.
Liners made of these plastics, however, have not been entirely successful because it has proven diflicult to obtain as good sealing characteristics and pressure retention properties with these liners as is obtained with cork liners. These difliculties are believed to be due to the fact that plastic liners do not possess the property of compressibility, which is found in cork. The compressibility of cork is generally attributed to the numerous pores or cell-like spaces which exist in the material.
I have discovered how to impart a cellular structure to a vinyl resin liner so as to produce a closure which in addition to the above advantages also has excellent sealing and gas retention properties. Furthermore, these properties are achieved with the employment of very small quantities of liner materials, i.e., less than 0.40 gms. The liner contains a myriad of gas spaces which are substantially uniform in size for the most part and are predominantly non-communicating. In addition, the liner is found to possess a film-like, substantially impervious surface.
This is a highly unique result since former attempts to prepare sponge-like liners have resulted in liners with very irregular cell size, perforations through the surface,
atent ice or so little void volume as to require a very thick liner in order to get significant compressibility. Liners with very irregular cell structure or cells spaces which extend through the surface do not give good seals because the gases and liquids in the container may Work their Way through and around the liner by way of the openings at the surface or by reason of the fact that the irregularly size spaced result in uneven contact of the liner against the bottle neck.
In the drawing the crown cap produced by my invention is shown in perspective section, and is indicated by 1. The liner is 2, with the substantially impervious film at the surface indicated by reference numeral 3. The cellular spaces throughout the liner are indicated at 4- 4.
My crown liner is prepared from a blown and fused plastisol composition. The plastisol composition is made up of a vinyl resin, a plasticizer and a blowing agent, with or without fillers and others additives. The composition is flowed onto the inner surface of a metal crown and fluxed by heating. During fluxing a viscous gel is formed and the blowing agent decomposes to produce hundreds of tiny gas cells in the liner. The blowing agent is chosen so as to decompose after the start of fluxing'. After cooling, the liner is a puffed, rubbery, resilient material. When the crown is placed on a glass container, the liner closely compreses to the configuration of the glass rim and leaves no spaces for leakage.
In addition to the excellent properties of the lined crown produced, my process has great advantages over previous processes for producing cellular liners, which have either placed preformed cellular material in a plastic composition or beaten the composition into a foam before applying it to the crown, since such previous compositions have been diflicult or impossible to send through high speed lining nozzles.
It is well known that plastisols are dispersions of vinyl resin in a non-volatile plasticizer which have the consistency of a paste. When such a mixture is heated to about 93-l07 C. the paste becomes gel-like and losses its fluidity. As temperatures increase to 177 C. or
higher the gel becomes more viscous and greater in strength. The change in properties of the material is brought about by solution of the resin in the plasticizer as the temperature is increased. Upon cooling the composition becomes a tough, rubbery mass.
The plastisol may be made from numerous comercially available thermoplastic materials such as polyvinyl chloride, copolymers of vinylchloride, polyvinyl acetate, copolymers of vinyl acetate, polyvinyl butyrate, polyvinyl alcohols. polyvinylidene chloride, copolymers of vinylidene chloride and polyvinyl aromatic compounds such as polystyrene. The preferred polymer is polyvinyl chloride.
The blowing agents in my process are chosen so that their decomposition temperature is slightly below the final fluxing temperature of the plastisol composition. A difference between maximum fluxing temperatures and decomposition of the blowing agent of about 15 to 30 C. is satisfactory. By so choosing the blowing agent, it is possible to produce blowing when the plastisol is in a fairly tough gel state; i.e., when it is not so fluid that blowing will cause perforations in the surface of the mass nor so well gelled as to prevent proper expansion of gas. There are numerous blowing agents which are suitable, the choice varying with the particular plastisol composition used. Among those which may be used are sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, diazoamino benzene, dinitrosopentamethvlenetetramine, urea-biuret, bisazo formamide. p.o'-oxvbisbenzene sulfonyl hydrazide and azo isobutyronitrile. I have found the nitrogen evolving compounds to be particularly suitable. Though the quantity of blowing agent may be widely varied from 0.1 to 5.0% depending upon the composition and degree of blowing desired, the best results have been realized using less than 1.5% based on the weight of plastisol mixture.
The plasticizer employed may be any of the Well known non-volatile plasticizers for vinyl resins which are known to dissolve the resin at higher temperatures. These include di-2-ethyl hexyl phthalate, di-isooctyl phthalate, acetyl tributyl citrate, di-octyl sebacate, di-hexyl adipate and 2-ethyl hexyl di-phenyl phosphate. The quantity of plasticizer used should be sufficient to form a plastisol of paste-like consistency. Ordinarily the percentage of plasticizer based on the weight of vinyl resin is 60 to 120%, with the preferred amount being from 6595%.
In addition to the plasticizer, resin and blowing agent, various other modifiers are usually desirable, such as lubricants, for example, parafiin wax; wetting agents such as lecithin, propylene glycol laurate, propylene, glycol stearate, zinc resinate, and glycerol mono-oleate; fillers such as talc, wood flour, diatomaceous earth and asbestos; pigments such as carbon black, titanium dioxide, iron oxides and aluminum powder; and stabilizers such as calcium stearate, zinc stearate, organo-tin complexes, epoxy resins and epoxidized oils.
As a specific example, a plastisol composition containing the following ingredients was prepared:
ingredients: Parts by weight No. of grams Vinyl chloride resin powder 100 Talc 30 Acetyl tributyl citrate 70 Calcium stearate 2 Glycerol mono-oleate 2 Dinitrosopentamethylene tetramine 5 Titanium dioxide 3 Paraffin wax 6 The wax was melted into one-quarter of the plasticizer and transferred to a paste mixer. Talc, glycerol monooleate, calcium stearate and titanium dioxide were added and blended to form a smooth paste. The resin and onehalf of the remaining plasticizer were added to produce a very viscous mass. Mixing was continued for 15 minutes to produce a substantially homogeneous paste. The remaining plasticizer was added with stirring to form a flowable paste. The batch was then discharged over an inclined plane to remove coarse air bubbles. During mixing the temperature was maintained between 3246 C.
The plastisol thus produced was applied to a number of metal crowns with a high speed automatic lining machine of the type well known in the industry where the crowns are spun on a revolving chuck beneath a pressure nozzle which expels a small quantity of compound onto each crown. The quantity applied was 0.330 gms. per crown, and the spin of the chuck spread the compound across the inner face of the crown. The crowns so lined were transferred to a 205 C. electric oven with circulating air currents and were heated for one minute. Upon removal from the oven, the crowns were cooled. The liners were tough and rubbery with hundreds of fine cells dispersed throughout.
The majority of the cells were non-communicating, while some formed sinuous passages with each other. The exposed surface was substantially impervious.
I claim:
1. A process of providing a crown cap with a compres sible, cellular liner comprising: forming a fluid plastisol composition containing as essential ingredients a vinyl resin, a plasticizer and a blowing agent having a decomposition temperature slightly below the final fluxing temperature of said plastisol composition, the amount of said plasticizer being in the range of 60% to 120% based on the weight of said vinyl resin and the amount of said blowing agent being in the range of 0.1% to 5.0% by weight based on the weight of said plastisol composition, applying said plastisol composition to the inner surface of a crown cap with a high speed lining machine wherein less than 0.40 gram of said plastisol composition is placed within said crown cap while said crown cap is spinning and thereby spread across the inner face of said crown cap, said spinning being the only method used to configure said cellular liner; heating said crown cap so lined to a temperature above about 177 C. to transform said plastisol composition into a viscous gel and decompose said blowing agent, and cooling said viscous gel to transform the same into a rubbery, resilient cellular liner having a substantially impervious structure.
2. A process of providing a crown cap with a compressible, cellular liner comprising: forming a fluid plastisol composition containing as essential ingredients a vinyl resin, a plasticizer and a blowing agent having a decomposition temperature about 15 to 30 C. below the final fiuxing temperature of said plastisol composition, the amount of said plasticizer being in the range of 65% and 95% based on the weight of said vinyl resin and the amount of said blowing agent being less than 1.5% by weight based on the weight of said plastisol composition;
applying said plastisol composition to the inner surface of a crown cap with a high speed lining machine wherein about 0.33 gram of said plastisol composition is placed within said crown cap while said crown cap is spinning and thereby spread across the inner face of said crown cap, said spinning being the only method used to configure said cellular liner; heating said crown cap so lined to a temperature of about 205 C. to transform said plastisol composition into a viscous gel, said blowing agent decomposing to produce a myriad of non-communicating gas cells of predominantly uniform size in said gel; and cooling said viscous gel to transform the same into a rubbery, resilient cellular liner having a substantially impervious surface.
References Cited in the file of this patent UNITED STATES PATENTS 2,256,483 Johnston Sept. 23, 1941 2,371,868 Berg et a1. Mar. 20, 1945. 2,387,730 Alderson Oct. 30, 1945 2,427,699 Aronovsky et al Sept. 23, 1947 2,489,407 Foye Nov. 29, 1949 2,654,913 Maier Oct. 13, 1953 2,663,909 Maier et a1. Dec; 29, 1953 2,684,774 Aichele July 27, 1954 2,744,042 Pace May 1, 1956 2,752,059 Schneider June 26, 1956 2,888,414 Fuller May 26, 1959 OTHER REFERENCES British Plastics, pp. 86-88.

Claims (1)

  1. 2. A PROCESS OF PROVIDING A CROWN CAP WITH A COMPRESSIBLE, CELLULAR LINER COMPRISING: FORMING A FLUID PLASTISOL COMPOSITION CONTAINING AS ESSENTIAL INGREDIENTS A VINYL RESIN, A PLASTICIZER AND A BLOWING AGENT HAVING A DECOMPOSITION TEMPERATURE ABOUT 15* TO 30*C. BELOW THE FINAL FLUXING TEMPERATURE OF SAID PLASTISOL COMPOSITION, THE AMOUNT OF SAID PLASTICIZER BEING IN THE RANGE OF 65% AND 95% BASED ON THE WEIGHT OF SAID VINYL RESIN AND THE AMOUNT OF SAID BLOWING AGENT BEING LESS THAN 1.5% BY WEIGHT BASED ON THE WEIGHT OF SAID PLASTISOL COMPOSITION; APPLYING SAID PLASTISOL COMPOSITION TO THE INNER SURFACE
US701682A 1957-12-09 1957-12-09 Crown closures Expired - Lifetime US3032826A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE570550D BE570550A (en) 1957-12-09
US701682A US3032826A (en) 1957-12-09 1957-12-09 Crown closures
FR1209584D FR1209584A (en) 1957-12-09 1958-08-18 Trim for bottle closing caps
GB29667/58A GB838200A (en) 1957-12-09 1958-09-16 Improvements in or relating to container closures
CH6588158A CH362614A (en) 1957-12-09 1958-11-06 Crown lock with a cellular structure, practically impermeable on the surface insert made of plasticized vinyl resin and process for its production

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Application Number Priority Date Filing Date Title
US701682A US3032826A (en) 1957-12-09 1957-12-09 Crown closures

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US3032826A true US3032826A (en) 1962-05-08

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BE (1) BE570550A (en)
CH (1) CH362614A (en)
FR (1) FR1209584A (en)
GB (1) GB838200A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118783A (en) * 1962-05-09 1964-01-21 Grace W R & Co Method of producing gaskets of elastomeric polymers for container closures
US3125459A (en) * 1964-03-17 Method of producing elastoueric polymer
US3164485A (en) * 1962-10-31 1965-01-05 Grace W R & Co Method of forming polyethylene gaskets in container closures
US3164486A (en) * 1962-05-09 1965-01-05 Grace W R & Co Method of producing gaskets for container closures
US3261895A (en) * 1963-10-29 1966-07-19 Rosen And Strickman Method for manufacturing resin products including foam products
US3271486A (en) * 1963-01-09 1966-09-06 Dunlop Robert George Method of producing an article for simulating a drinking glass containing a drink
US3303954A (en) * 1962-03-30 1967-02-14 Grace W R & Co Bonding foamed polystyrene to metal
US3373889A (en) * 1961-05-31 1968-03-19 Phoenix Metal Cap Co Inc Pressure sealing jar lid
US3444281A (en) * 1966-04-21 1969-05-13 Grace W R & Co Process of preparing cellular closure gaskets
US4392581A (en) * 1981-07-09 1983-07-12 Japan Crown Cork Co. Ltd. Container closure having a liner and method for its production
WO1985000153A1 (en) * 1983-06-23 1985-01-17 Bev-Cap Plastics Pty. Ltd. Compounded closure
US4739547A (en) * 1986-09-16 1988-04-26 Shell Oil Company Non-crosslinked foam
US5132061A (en) * 1987-09-03 1992-07-21 Armstrong World Industries, Inc. Preparing gasket compositions having expanded microspheres

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295573A (en) * 1979-12-21 1981-10-20 Nordson Corporation Method of obtaining a seal upon the interior surface of a container closure and resulting product
EP0091699A3 (en) * 1979-12-21 1986-03-19 Nordson Corporation Improvement in or relating to apparatus for forming a seal on a closure and to a closure having a seal formed from a foamed adhesive material

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US2256483A (en) * 1939-06-21 1941-09-23 Du Pont Synthetic spongy material
US2371868A (en) * 1940-09-09 1945-03-20 Berg Herbert Porous polyvinyl chloride compositions
US2387730A (en) * 1942-04-07 1945-10-30 Du Pont Process for obtaining cork-like products from polymers of ethylene
US2427699A (en) * 1943-09-18 1947-09-23 Samuel I Aronovsky Crown closures
US2489407A (en) * 1947-08-09 1949-11-29 Dewey And Almy Chem Comp Method of lining container closures
US2654913A (en) * 1950-07-27 1953-10-13 Continental Can Co Art of making closure seals by molding and curing
US2663909A (en) * 1950-11-08 1953-12-29 Continental Can Co Production of closure seals by partially curing a cushion material and thereafter shaping and completing the cure
US2684774A (en) * 1950-08-16 1954-07-27 Joseph J Mascuch Sealing closure for containers and method of producing same
US2744042A (en) * 1951-06-21 1956-05-01 Goodyear Tire & Rubber Laminated panels
US2752059A (en) * 1950-11-08 1956-06-26 Continental Can Co Closure with sealing pad having concentric ribs
US2888414A (en) * 1956-08-22 1959-05-26 Du Pont Process of preparing an open cell polyvinyl chloride sponge

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Publication number Priority date Publication date Assignee Title
US2256483A (en) * 1939-06-21 1941-09-23 Du Pont Synthetic spongy material
US2371868A (en) * 1940-09-09 1945-03-20 Berg Herbert Porous polyvinyl chloride compositions
US2387730A (en) * 1942-04-07 1945-10-30 Du Pont Process for obtaining cork-like products from polymers of ethylene
US2427699A (en) * 1943-09-18 1947-09-23 Samuel I Aronovsky Crown closures
US2489407A (en) * 1947-08-09 1949-11-29 Dewey And Almy Chem Comp Method of lining container closures
US2654913A (en) * 1950-07-27 1953-10-13 Continental Can Co Art of making closure seals by molding and curing
US2684774A (en) * 1950-08-16 1954-07-27 Joseph J Mascuch Sealing closure for containers and method of producing same
US2663909A (en) * 1950-11-08 1953-12-29 Continental Can Co Production of closure seals by partially curing a cushion material and thereafter shaping and completing the cure
US2752059A (en) * 1950-11-08 1956-06-26 Continental Can Co Closure with sealing pad having concentric ribs
US2744042A (en) * 1951-06-21 1956-05-01 Goodyear Tire & Rubber Laminated panels
US2888414A (en) * 1956-08-22 1959-05-26 Du Pont Process of preparing an open cell polyvinyl chloride sponge

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125459A (en) * 1964-03-17 Method of producing elastoueric polymer
US3373889A (en) * 1961-05-31 1968-03-19 Phoenix Metal Cap Co Inc Pressure sealing jar lid
US3303954A (en) * 1962-03-30 1967-02-14 Grace W R & Co Bonding foamed polystyrene to metal
US3164486A (en) * 1962-05-09 1965-01-05 Grace W R & Co Method of producing gaskets for container closures
US3118783A (en) * 1962-05-09 1964-01-21 Grace W R & Co Method of producing gaskets of elastomeric polymers for container closures
US3164485A (en) * 1962-10-31 1965-01-05 Grace W R & Co Method of forming polyethylene gaskets in container closures
US3271486A (en) * 1963-01-09 1966-09-06 Dunlop Robert George Method of producing an article for simulating a drinking glass containing a drink
US3261895A (en) * 1963-10-29 1966-07-19 Rosen And Strickman Method for manufacturing resin products including foam products
US3444281A (en) * 1966-04-21 1969-05-13 Grace W R & Co Process of preparing cellular closure gaskets
US4392581A (en) * 1981-07-09 1983-07-12 Japan Crown Cork Co. Ltd. Container closure having a liner and method for its production
WO1985000153A1 (en) * 1983-06-23 1985-01-17 Bev-Cap Plastics Pty. Ltd. Compounded closure
US4739547A (en) * 1986-09-16 1988-04-26 Shell Oil Company Non-crosslinked foam
US4791147A (en) * 1986-09-16 1988-12-13 Shell Oil Company Non-crosslinked foam
US5132061A (en) * 1987-09-03 1992-07-21 Armstrong World Industries, Inc. Preparing gasket compositions having expanded microspheres

Also Published As

Publication number Publication date
FR1209584A (en) 1960-03-02
CH362614A (en) 1962-06-15
GB838200A (en) 1960-06-22
BE570550A (en)

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