US20140183197A1 - Seal for elevated temperature applications and method of forming same - Google Patents

Seal for elevated temperature applications and method of forming same Download PDF

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Publication number
US20140183197A1
US20140183197A1 US14/113,153 US201214113153A US2014183197A1 US 20140183197 A1 US20140183197 A1 US 20140183197A1 US 201214113153 A US201214113153 A US 201214113153A US 2014183197 A1 US2014183197 A1 US 2014183197A1
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US
United States
Prior art keywords
cap
seal
plastisol
container
coating
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.)
Abandoned
Application number
US14/113,153
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English (en)
Inventor
Steven T. Cook
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.)
Dayton Systems Group Inc
Original Assignee
Dayton Systems Group Inc
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 Dayton Systems Group Inc filed Critical Dayton Systems Group Inc
Priority to US14/113,153 priority Critical patent/US20140183197A1/en
Assigned to DAYTON SYSTEMS GROUP, INC. reassignment DAYTON SYSTEMS GROUP, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: COOK, STEVEN T.
Publication of US20140183197A1 publication Critical patent/US20140183197A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
    • 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
    • B21D51/46—Placing sealings or sealing material
    • 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
    • B21D51/50—Making screw 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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
    • B65D53/02—Collars or rings

Definitions

  • This disclosure relates to containers or cans of a wide variety of sizes, volume, etc. used in the food and beverage industry or in connection with other fluid products such as oil, paint, powders, etc. More particularly, this application relates to reclosable containers as disclosed in commonly owned U.S. Pat. Nos. 6,082,944 and 6,015,062, and to the disclosure of related published International Application W0 2006/072079, the disclosures of which are expressly incorporated herein by reference.
  • the disclosure is related to seals within a container cap having a general shape of an inverted cup that fits closely about and interacts with a container body having a neck.
  • the neck has a pour opening at its top and a plurality of thread lugs formed outwardly in the neck material at a predetermined spacing below the pour opening.
  • the thread lugs interact with a plurality of lugs extending inwardly from a perimeter of the cap and spaced about a lower rim of the cap to draw the interior surface or underside of the cap toward the pour opening and to complete a seal between the neck/body and cap.
  • Such needs may involve pressurization or vacuum packing of the container contents, or an ability to withstand the high temperature and elevated pressure of retort operations after filling and closing, or possible exposure to wide ranges of temperatures from other sources after filling and sealing. These are but a few potential requirements encountered in adapting such a container to a large variety of potential contents.
  • the seal is typically extruded from pellets heated to approximately 340° F.
  • the material was extruded into the cap, such as an aluminum cap, and then cold-formed with a tool to match a lip curl on the dome of the container.
  • the seal could be formed into an annulus or ring that only covers and seals on the lip curl, or could be formed into a disk to cover the center area of the cap with the form for the lip curl.
  • This seal worked very well and held high pressures, over approximately 140 PSI.
  • One problem was that the seal would not stick to the aluminum cap and could potentially fall out when the cap was removed from the can.
  • a coating material provided on the cap is designed to keep anything from sticking to it. The coating is in widespread use, and therefore changing the coating would be a difficult change over the entire industry.
  • EVA ethylene vinyl acetate copolymer
  • the flat disk was generally oversized so that the disk would not fall out of the cap interior i.e., the perimeter edge of the oversized flat disk would interfere with the lugs provided on the cap and therefore be effectively retained within the cup-shaped cavity of the cap in a position where the seal would abuttingly engage the lip curl on the container.
  • the cost of this EVA material has recently substantially increased, thus requiring potential alternative options.
  • disk seal performance was generally acceptable, this type of seal did not perform as well as extruded or cold-formed seals.
  • the EVA material was only suitable for cold fill products, and would not work well for hot fill or pasteurized products such as beer.
  • a method of forming a seal for a reclosable container having a removable cap that is selectively received over a pour opening formed in a can body including applying a seal material to an interior surface of the cap. If the seal is a plastisol, the method includes curing the plastisol at an elevated temperature in the cap. The seal is then cold-formed to the desired shape.
  • the seal can be fowled into an annulus or ring that only covers and seals on the lip curl, or could be formed into a disk to cover the center area of the cap along with the desired form for the lip curl.
  • the seal works well at high pressures, as well as in vacuum situations, and is also applicable to high temperature environments.
  • FIG. 2 is an elevational view of the seal of FIG. 1 .
  • FIG. 4 is a plan view of an interior surface of a conventional lugged cap receiving a seal disk.
  • FIG. 5 is an elevational view of the seal disk of FIG. 4 .
  • FIG. 6 illustrates the machinery for manufacturing the seal disk of FIG. 4 .
  • FIG. 7 shows the scrap left from a web of the seal material as a result of the manufacturing of the seal disks.
  • FIG. 10 illustrates the applicator dispensing the fluidized plastisol along an interior face of the cap.
  • FIGS. 11 and 12 show the cold form tooling station that receives the cap from FIG. 10 after has been baked.
  • FIG. 13 shows an oven for baking a plastisol and/or pre-coat coating on the interior surface of the cap.
  • FIGS. 1-3 The development of the plastisol cold-form seal and various images of the original extruded and cold formed seals ( FIGS. 1-3 ) and current EVA seal disks ( FIGS. 4-7 ) are shown in the attached drawings.
  • FIGS. 1-3 show a conventional extruded and cold-formed seal 100 received in a cup-shaped cap 110 .
  • the seal 100 has a cross-sectional profile conducive to formation by extrusion and is typically formed into a generally C-shaped conformation 120 having an enlarged inner diameter and a space or gap 130 between opposite ends 132 , 134 of the seal.
  • the seal 100 is reduced in diametrical dimension, i.e., the opposite ends 132 , 134 abut against one another and form a circumferentially continuous seal member received in the cap interior.
  • the seal 100 is disposed at a location radially inward of the cap inner perimeter, and preferably dimensioned to engage the lip or outer curl of the can body.
  • FIGS. 4-7 show a typical EVA seal 200 received in the interior of the cup-shaped cap 210 , and mechanically held in position by an interference engagement between a peripheral portion or perimeter of the seal 200 and the lugs 212 that extend radially inward toward the cap interior.
  • the seal 200 is preferably cut from a continuous web 220 of seal material, and for example may have a thickness ( FIG. 5 ) on the order of 0.035′′.
  • the web 220 of material proceeds through a blanking station 230 where cooperating tool surfaces out or blank the individual seal disks 200 from the web.
  • a large amount of scrap material 240 remains once the individual seal disks 200 have been formed.
  • the new seals 300 formed on the interior face of the cap 310 are illustrated in FIGS. 8-9 , while the applicator 320 and cold form tooling station 330 are shown in FIGS. 10-12 , and a baking oven 340 shown in FIG. 13 .
  • the cap 310 typically includes a coating on the interior surface.
  • This coating 350 allows a plastisol material (which is used for sealing) to stick to the cap 310 .
  • plastisol is a suspension of polyvinyl chloride (PVC) particles in a plasticizer.
  • PVC polyvinyl chloride
  • the plastisol advantageously flows as a liquid and can be poured into a heated mold or is sufficiently viscous an as to be sprayed as in the present disclosure (and as will be further described below).
  • the plastisol is sprayed into a cap 310 (that is, sprayed on the interior surface of the cup-shaped cap) and then cold-formed.
  • the plastisol material is typically used for retort products, because the can and cap 310 will not be exposed to temperatures over 250° F. during the retort process, that is, pasteurized products are typically processed below 165° F. Therefore, using the plastisol material for pasteurized products seems to exhibit good performance characteristics and passes the pasteurized tests, as well as exhibiting low on-off torques in attaching and removing a cap 310 from the associated container.
  • the plastisol is sprayed over the entire interior surface in one preferred method, but one skilled in the art will recognize that the spray may be more directed and only be applied to a portion of the interior surface of the cap.
  • a pre-coating 350 was found that when heated to 40° F. for a predetermined time. (e.g., 11 min), would allow the pre-coating 350 to stick to the aluminum cap 310 and then the plastisol 300 would adhere to the pre-coating.
  • the plastisol 300 is then sprayed into the cap (on to the interior surface of the cup-shaped cap at a thickness of approximately 0.030-0.040′′ although other ranges might be used), heated to approximately 400° F. for a preselected time (e.g., approximately 2 min.) to cure, and then cold-formed into a desired configuration.
  • plastisol, cold-formed seals 300 perform well for pasteurized products with low on-off torques.
  • the plastisol seal 300 also out-performed the EVA disk used for cold fill beverages.
  • the plastisol cold-fowled seal 300 held higher pressures with low on-off torques.
  • the plastisol seal 300 can be used for almost all products and the cost is significantly less than other seal alternatives.
  • the plastisol opens the possibility for new markets such as beer, where the plastisol, cold-formed seal 300 can also be used for cold fill products at a considerable savings for the can maker.
  • the process of applying the new plastisol, cold-formed seal of the present disclosure would be roughly the same for a steel or aluminum container/cap (after applying the pre-coat to the aluminum).
  • the process would include applying e.g., spraying, the plastisol into the cap 310 , baking the plastisol after application to the cap (e.g., baking at approximately 400° F. in an oven such as depicted in FIG. 13 ) for a predetermined time (approximately 2 min.), and then cold fowling the plastisol (in the tooling station of FIGS. 11 and 12 to form the final profile or configuration of the seal in the cap that cooperates with the body lip or curl of the can body.
  • the lugs of the cap engage the thread lug portions of the can body during relative rotation of the cap in first direction relative to the body, the cap is axially drawn into sealed abutting engagement with the outer end of the can body.
  • the EVA pelletized material is formed into an extrusion and a bead applied to the inner surface of the cap.
  • the extruded bead can be placed at a desired thickness and desired location.
  • the seal is cold-formed in a tooling station such as shown in FIGS. 11-12 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Closures For Containers (AREA)
US14/113,153 2011-04-20 2012-04-20 Seal for elevated temperature applications and method of forming same Abandoned US20140183197A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/113,153 US20140183197A1 (en) 2011-04-20 2012-04-20 Seal for elevated temperature applications and method of forming same

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201161477493P 2011-04-20 2011-04-20
PCT/US2012/034394 WO2012145590A2 (fr) 2011-04-20 2012-04-20 Joint pour applications à température élevée et méthodes de fabrication de celui-ci
US14/113,153 US20140183197A1 (en) 2011-04-20 2012-04-20 Seal for elevated temperature applications and method of forming same

Publications (1)

Publication Number Publication Date
US20140183197A1 true US20140183197A1 (en) 2014-07-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
US14/113,153 Abandoned US20140183197A1 (en) 2011-04-20 2012-04-20 Seal for elevated temperature applications and method of forming same

Country Status (4)

Country Link
US (1) US20140183197A1 (fr)
CA (1) CA2833967A1 (fr)
MX (1) MX2013012320A (fr)
WO (1) WO2012145590A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160114940A1 (en) * 2013-03-15 2016-04-28 Amcor Limited Container Finish For Metal Lug Closure

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835926A (en) * 1950-11-08 1958-05-27 Continental Can Co Art of making closure members by depositing and curing a compound in the closure shell and thereafter molding
US3005433A (en) * 1959-01-22 1961-10-24 Anchor Hocking Glass Corp Closure cap and method of making same
US3325035A (en) * 1963-10-29 1967-06-13 Rosen And Strickman Container closures
US3532243A (en) * 1968-01-09 1970-10-06 Anchor Hocking Corp Closure cap with molded threads
US4461605A (en) * 1981-05-07 1984-07-24 Swiss Aluminium Ltd. Process for manufacturing lids with a closure strip covering at least one pouring hole, in particular such lids for beverage cans
US4863030A (en) * 1988-08-01 1989-09-05 Anchor Hocking Corporation Press-on, twist-off plastisol-lined metal closure
US20030129334A1 (en) * 2002-01-07 2003-07-10 Fabricas Monterrey, S.A. De C.V. Cap closure and detachable liner
US20080302799A1 (en) * 2007-06-08 2008-12-11 Silgan Containers Corporation Metal container with screw-top closure and method of making the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1066686B (de) * 1957-04-01 1959-10-08 Continental Can Company, Inc., New York, N. Y. (V. St. A.) Dichtungsmasse auf der Grundlage eines Polyvinylchloridharzes zur Herstellung eines Dichtungsringes
JPH04339772A (ja) * 1991-05-09 1992-11-26 Toyo Seikan Kaisha Ltd ライナー付容器蓋及びその製造方法
US20050167392A1 (en) * 2004-01-29 2005-08-04 Fabricas Monterrey, S.A. De C.V. Metallic cap closure having water repelling properties and method of fabricating the same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835926A (en) * 1950-11-08 1958-05-27 Continental Can Co Art of making closure members by depositing and curing a compound in the closure shell and thereafter molding
US3005433A (en) * 1959-01-22 1961-10-24 Anchor Hocking Glass Corp Closure cap and method of making same
US3325035A (en) * 1963-10-29 1967-06-13 Rosen And Strickman Container closures
US3532243A (en) * 1968-01-09 1970-10-06 Anchor Hocking Corp Closure cap with molded threads
US4461605A (en) * 1981-05-07 1984-07-24 Swiss Aluminium Ltd. Process for manufacturing lids with a closure strip covering at least one pouring hole, in particular such lids for beverage cans
US4863030A (en) * 1988-08-01 1989-09-05 Anchor Hocking Corporation Press-on, twist-off plastisol-lined metal closure
US20030129334A1 (en) * 2002-01-07 2003-07-10 Fabricas Monterrey, S.A. De C.V. Cap closure and detachable liner
US20080302799A1 (en) * 2007-06-08 2008-12-11 Silgan Containers Corporation Metal container with screw-top closure and method of making the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160114940A1 (en) * 2013-03-15 2016-04-28 Amcor Limited Container Finish For Metal Lug Closure
US9856056B2 (en) * 2013-03-15 2018-01-02 Amcor Group Gmbh Container finish for metal lug closure
US9868568B2 (en) 2013-03-15 2018-01-16 Amcor Group Gmbh Container finish for metal lug closure

Also Published As

Publication number Publication date
MX2013012320A (es) 2014-05-27
CA2833967A1 (fr) 2012-10-26
WO2012145590A3 (fr) 2013-07-04
WO2012145590A2 (fr) 2012-10-26

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Legal Events

Date Code Title Description
AS Assignment

Owner name: DAYTON SYSTEMS GROUP, INC., OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:COOK, STEVEN T.;REEL/FRAME:032117/0403

Effective date: 20140124

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION