US3380419A - Method of making closure caps - Google Patents

Method of making closure caps Download PDF

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Publication number
US3380419A
US3380419A US315333A US31533363A US3380419A US 3380419 A US3380419 A US 3380419A US 315333 A US315333 A US 315333A US 31533363 A US31533363 A US 31533363A US 3380419 A US3380419 A US 3380419A
Authority
US
United States
Prior art keywords
caps
sheets
cap
plastisol
polyolefin resin
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
US315333A
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English (en)
Inventor
John J Moloney
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
Original Assignee
Continental Can Co 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 Continental Can Co Inc filed Critical Continental Can Co Inc
Priority to US315333A priority Critical patent/US3380419A/en
Priority to DE1657669A priority patent/DE1657669C3/de
Priority to OA51310A priority patent/OA01151A/fr
Priority to US708458A priority patent/US3549037A/en
Application granted granted Critical
Publication of US3380419A publication Critical patent/US3380419A/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
    • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
    • B65D53/06—Sealings formed by liquid or plastic 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
    • 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
    • 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

Definitions

  • This invention relates, generally, to innovations and improvements in closure caps for glass containers such as glass bottles and jars, such closure caps having two features in common.
  • the shells or bodies thereof are blanked or stamped from tinplate or the like.
  • the caps have interior gaskets or liners formed of cured plastisols.
  • the invention relates to improvements and innovations in the conventional method of making such closure caps, the caps themselves, as well as in the prepared sheet stock from which the same are made.
  • Closure caps of the type referred to are broadly old in the art and often are more specifically identified to type as crown caps, lug caps, screw caps, press-on caps, etc.
  • Crown caps are the type that are used on bottles containing liquids under pressure such for example as soda pop bottles, beer bottles, etc.
  • Crown caps or closures having plastisol liners are disclosed for example in Maier et al. Patents Nos. 2,835,926, 2,654,913, 2,654,914, 2,663,- 908 and Schneider Patents Nos. 2,719,654 and 2,752,059.
  • Screw caps, press-on caps and lug caps are typified by the ones that are commonly used on wide mouth glass jars in the food industries such as those containing peanut butter, pickles, jellies and jams, etc., as well as the smaller diameter caps that are used on catsup and chili sauce bottles.
  • Patents showing lug caps having cured plastisol gaskets include Unger et a1.
  • sheets of tinplate are first properly prepared with respect to the surfaces thereof before the closure cap shells are stamped, blanked or died out from the sheets.
  • the surface of such a sheet that is going to form the exterior surfaces of the caps will generally be coated with one or more applications of enamel or lacquer and then decoration and printing will often be applied by lithography or other appropriate technique.
  • These tinplate sheets with their surfaces thus prepared will typically measure 29 inches by 34 inches.
  • the cap shells are formed from tinplate having the surfaces properly prepared just as they were before.
  • the palstisol compositions are deposited or flowed into place and then the cap shells containing the flowed in plastisol gaskets or liners are subjected to fluxing or curing temperatures, e.g. 400-475 F. for approximately one minute.
  • paraffin wax previously used as the sole coating material for the tinplate sheets may be successfully replaced by a solution of parafiin wax containing from about 1 to 30% by weight of polyolefin resin which does not volatilize materially during the curing of the plastisol gaskets or liners.
  • the parafiin as well as the polyolefin resin serve very well as high pressure lubricants during the blanking or stamping out of the cap shells from the plates, while the polyolefin resin will remain as a residual coating after the curing step so as to provide the necessary protective coating to prevent abrasion, dusting, sticking, and to facilitate hoppering of the caps.
  • an important object of the present invention is the improvement in the method of making closure caps of the class described having plastisol liners or gaskets which comprises applying to the proper surfaces of the sheets of tinplate from which the cap shells or bodies are to be formed a coating in the form of a solution of polyolefin resin in molten paraffin wax.
  • FIG. 1 is a schematic view of a product line and apparatus for continuously coating sheets of tinplate, having the surfaces thereof prepared for the formation of cap shells therefrom, with a heated solution of a polyolefin resin in paraffin wax;
  • FIG. 2 is a diagrammatic view of a production line and apparatus showing the manner in which the fully prepared and coated tinplate sheets from the apparatus and line of FIG. 1 are formed into completed closure caps;
  • FIG. 3 is a detailed sectional view on enlarged scale taken through a fully prepared and coated sheet from the operation and apparatus illustrated in FIG. 1, the section being taken on line 3-3 in FIG. 1;
  • FIG. 4 is a fragmentary cross sectional view through a completed lug cap formed in accordance with the principles of the present invention.
  • the upper run 5 of a conveyor for delivering sheets 6 of tinplate is shown, with the discharge end of the conveyor running over a driven end return roll 7.
  • a driven end return roll 7 As each of the sheets 6 passes over the roll 7 it is delivered onto a stack of sheets which is being built up on a pallet 8 which is placed on the platform 10 of a height control device for maintaining the level Of the uppermost sheet 6 of the stack.
  • the device 11 has a hydraulic cylinder 12 which allows the top of each pallet 8 to be started out at the desired level and then permits the pallets with their stack of sheets to lower as additional sheets are added.
  • the sheets 6 are evenly positioned in place by means of an aligning fence or guide member 13.
  • the sheets 6 come in on the upper run 5 of the conveyor these sheets have already had both their upper and lower surfaces suitably prepared for the formation of closure cap shells or bodies therefrom.
  • the bottom surfaces of these sheets of tinplate will be suitably lacquered or enameled with one or more coatings of an appropriate lacquer or enamel formulation for service on the interiors of the cap shells or bodies.
  • the exterior or upper surfaces of the sheets 6 will also have been suitably enameled or lacquered, and may also very well be decorated with advertising material, names and indicia of the type customarily found on the exterior of closure caps of this type.
  • each of these heads receives a solution of a polyolefin resin in molten paraffin wax through a conduit or line 15 and also receives air under pressure for atomization through a line 16.
  • the line 16 is provided with a pressure gauge 17, and desirably with an automatic pressure regulating valve 18 of known type.
  • the line 16 is shown being connected to a source of air pressure such as an air compressor indicated diagrammatically at 20.
  • the solution delivered through line 15 is prepared and maintained in a tank 21 which is preferably provided with a cover 22 and is also equipped with a heating coil 23 and a stirrer or agitator 24 driven by a mixer or agitator motor 25.
  • the motor 25 is energized from a source of alLernating current indicated diagrammatically at '26 by way of conductors 27 and 28 with conductor 27 including an operating switch indicated diagrammatically at 30.
  • the electric heating coil 23 is also energized from the current source 26 by way of conductors 31 and 32 with conductor 31 including a control switch 33 and with conductor 32 including in series a variable potentiometer of known type indicated diagrammatically at 34.
  • the solution of polyolefin resin in molten paraffin wax contained within the tank 21 may be prepared in one of several ways. According to one method the paraffin wax is first melted and held at a temperature of about 195 F. within the tank 21, care being taken that it has not become heated over 200 F. since it tends to oxidize rapidly and become rancid at such elevated temperatures. Pellets of the polyolefin resin in the desired amount may then be added, with agitation provided by the stirrer 24 to the molten wax being continued until these pellets are all dissolved completely and uniformly within the tank 21.
  • a somewhat faster method of preparing the molten solution within the tank 21 is to prepare separate melts of the paratfin wax and the polyolefin resin.
  • the paratfin wax is melted in a separate container to a temperature of about 180 F. while the polyolefin resin is separately melted at a temperature in the order of 225 F.
  • the melted resin is added to the molten wax slowly and with agitation with a complete solution being obtained and properly carried out without entrapping air in the melt. Since the amount of polyolefin resin added to the paraffin is relatively small (e.g. about 1 to by weight) the fact that the resin is at a temperature above 200 F. causes no harm upon being blended with the paraffin wax at a temperature somewhat below 200 F., e.g. 180 F., since the resultant temperature will be under 200 F.
  • the polyolefin resin may be one of several that are commercially available including polyethylene and polypropylene.
  • a preferred polyolefin resin is a non-emulsifiable, low molecular weight polyethylene resin commercially available from Eastman Chemical Products, Inc., Kingsport, Tenn., under the trade name Epolene N-ll. This particular commercially available resin is characterized by a ring and ball softing point of l07.5 C.; a penetration hardness at g./ 5 sec./77 F., of 0.2 mm., a density at 77 F. of 0.925; a Brookfield viscosity at 257 F. of 390 centipoises, and a molecular weight of approximately 1500; and a color of 1 on the Gardner scale.
  • the solution within tank 21 must contain sufficient of the polyolefin resin so that after the paraflin wax has been largely volatilized during the fluxing or curing of the plastisol gasket or liner, there will be a suificient residual of the resin to provide the necessary protective film or coating on the outer surfaces of the cap shells as described above.
  • the melting point thereof being somewhat in excess of 200 F., it is liable to result in a composite melting point which is excessive.
  • the useful range of concentration of the polyolefin resin is from about 1 to 30% by weight of the total solution mixture, the balance being substantially and entirely the paraffin wax.
  • the mixer or agitator 24 may be stopped since the solution will remain stable without further agitation as long as it is retained in the molten condition at a temperature between about -200 F.
  • additional solution can be made up from time to time so that the operation of the equipment may be continuous.
  • the additional solution can be made up within the tank 21 or it can be made up in a separate tank and added thereto or it can be made up in a separate tank which may be switched to line 15 when the tank 21 is empty or near-empty.
  • the amount of the solution applied to the upper surfaces of the sheets 6 can vary between approximately .0000024 to .0000097 ounce per square inch surface area. Since the film or coating applied by the spray heads 14 is relatively thin, the same readily solidifies on the plates 6, although a blast of cooling air could be used if required.
  • the fully prepared and sprayed or coated sheet 6 continue to build up on the pallet that is in place on the stack-height control 11 until the proper number of sheets has been received onto the stack.
  • the pallet with the stack in place is then removed while a new palate is inserted in place so as to allow another stack to be built up.
  • the removed stack is then taken and mounted on the table 40 of another stack-height control device indicated generally at 41 and including a hydraulic cylinder 42.
  • the hydraulic cylinder 42 raises the height of the stack to the level which is approximately even or level with the upper run 44 of a conveyor of known type.
  • the vacuum pick-up devices transfer the sheets 6 to the upper run where they are fed into cap blanking and forming machinery of known type indicated diagrammatically at 45.
  • the machines used for stamping out or blanking out the cap shells from the sheets 6 is well known in the art and does not require specific illustration or description.
  • the cap blanks or empty shells that are formed in the equipment 45 are shown as discharging on the upper run of the conveyor, the same being indicated at 46. These empty shells go into plastisol gasket applying equipment in the upside down position, this equipment being indicated diagrammatically at 47 inasmuch as it is also well known and commercially available.
  • This equipment is indicated diagrammatically at 50.
  • the caps themselves are indicated at 52.
  • the finished caps 52 are discharged from the conveyor into a shipping carton.
  • the wax content plus the polyolefin resin in the spray coated solution within the tank 21 is sufiicient to provide adequate protection to the metal when it is stamped or blanked out into the cap shells or blanks in passing through the equipment 45. While most of the parafiin is volatilized on passage of the caps through the equipment 50, the polyolefin resin remains in place with little or no loss through volatilization.
  • FIG. 3 one of the sheets 6 is shown in magnified cross-section (not to scale).
  • the tinplate itself is indicated at 55
  • the prepared inner cap surface that receives the plastisol gaskets or liners is indicated at 56
  • the enameled or lacquered exterior surface is indicated at 57
  • FIG. 4 a portion of a rotatable lug cap is shown being provided with an annular plastisol gasket 61 on the interior and with a residual film of polyolefin being indicated at 62.
  • the residual film 62 remains after the cap 60 has undergone curing and the paraffin wax content of the coating or layer 58 in FIG. 3 has been volatilized.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Laminated Bodies (AREA)
US315333A 1963-10-10 1963-10-10 Method of making closure caps Expired - Lifetime US3380419A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US315333A US3380419A (en) 1963-10-10 1963-10-10 Method of making closure caps
DE1657669A DE1657669C3 (de) 1963-10-10 1964-03-05 Verschlußkappe für Flaschen oder Gläser
OA51310A OA01151A (fr) 1963-10-10 1964-12-31 Capsules d'obturation et procédé pour leur fabrication.
US708458A US3549037A (en) 1963-10-10 1967-12-01 Closure cap

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US315333A US3380419A (en) 1963-10-10 1963-10-10 Method of making closure caps

Publications (1)

Publication Number Publication Date
US3380419A true US3380419A (en) 1968-04-30

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US315333A Expired - Lifetime US3380419A (en) 1963-10-10 1963-10-10 Method of making closure caps

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US (1) US3380419A (fr)
DE (1) DE1657669C3 (fr)
OA (1) OA01151A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641959A (en) * 1968-12-18 1972-02-15 Ball Corp Method for producing closures
US3745953A (en) * 1968-12-18 1973-07-17 Ball Corp Apparatus for producing closures
US20100003109A1 (en) * 2006-10-31 2010-01-07 Crow Packaging Technology, Inc. Method for producing such a metal closure with seperate disc and ring from a single closure blank
US20110011866A1 (en) * 2008-03-20 2011-01-20 Crown Packaging Technology, Inc. Closure
US20110036134A1 (en) * 2008-04-21 2011-02-17 Crown Packaging Technology, Inc. Cutting method and apparatus
USD656818S1 (en) 2010-05-11 2012-04-03 Crown Packaging Technology, Inc. Closure cap
USD682105S1 (en) 2010-07-08 2013-05-14 Crown Packaging Technology, Inc. Closure cap
USD793307S1 (en) * 2015-03-17 2017-08-01 Yuan-Hung WEN Brake backing plate with heat sink

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1895711A (en) * 1931-07-17 1933-01-31 Nashua Gummed & Coated Paper C Coated sheet material
US2186519A (en) * 1938-09-14 1940-01-09 Geo V Clark Co Inc Manufacture of closures for containers
US2291079A (en) * 1940-02-06 1942-07-28 American Cyanamid Co Paper having high wet strength and process of producing the same
US3005433A (en) * 1959-01-22 1961-10-24 Anchor Hocking Glass Corp Closure cap and method of making same
US3096898A (en) * 1960-10-17 1963-07-09 Owens Illinois Glass Co Container and closure cap therefor
US3110409A (en) * 1961-10-26 1963-11-12 Continental Can Co Closure cap for glass containers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1895711A (en) * 1931-07-17 1933-01-31 Nashua Gummed & Coated Paper C Coated sheet material
US2186519A (en) * 1938-09-14 1940-01-09 Geo V Clark Co Inc Manufacture of closures for containers
US2291079A (en) * 1940-02-06 1942-07-28 American Cyanamid Co Paper having high wet strength and process of producing the same
US3005433A (en) * 1959-01-22 1961-10-24 Anchor Hocking Glass Corp Closure cap and method of making same
US3096898A (en) * 1960-10-17 1963-07-09 Owens Illinois Glass Co Container and closure cap therefor
US3110409A (en) * 1961-10-26 1963-11-12 Continental Can Co Closure cap for glass containers

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641959A (en) * 1968-12-18 1972-02-15 Ball Corp Method for producing closures
US3745953A (en) * 1968-12-18 1973-07-17 Ball Corp Apparatus for producing closures
US20100003109A1 (en) * 2006-10-31 2010-01-07 Crow Packaging Technology, Inc. Method for producing such a metal closure with seperate disc and ring from a single closure blank
US8899091B2 (en) * 2006-10-31 2014-12-02 Crown Packaging Technology, Inc. Method for producing such a metal closure with separate disc and ring from a single closure blank
US20110011866A1 (en) * 2008-03-20 2011-01-20 Crown Packaging Technology, Inc. Closure
US8636161B2 (en) 2008-03-20 2014-01-28 Crown Packaging Technology, Inc. Closure
US9387959B2 (en) 2008-03-20 2016-07-12 Crown Packaging Technology, Inc. Closure
US20110036134A1 (en) * 2008-04-21 2011-02-17 Crown Packaging Technology, Inc. Cutting method and apparatus
USD656818S1 (en) 2010-05-11 2012-04-03 Crown Packaging Technology, Inc. Closure cap
USD682105S1 (en) 2010-07-08 2013-05-14 Crown Packaging Technology, Inc. Closure cap
USD793307S1 (en) * 2015-03-17 2017-08-01 Yuan-Hung WEN Brake backing plate with heat sink

Also Published As

Publication number Publication date
OA01151A (fr) 1968-08-07
DE1657669A1 (de) 1972-02-24
DE1657669B2 (de) 1973-10-31
DE1657669C3 (de) 1974-06-12

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