US3368707A - Differential pressure formed plastic container cap or closure - Google Patents

Differential pressure formed plastic container cap or closure Download PDF

Info

Publication number
US3368707A
US3368707A US575045A US57504566A US3368707A US 3368707 A US3368707 A US 3368707A US 575045 A US575045 A US 575045A US 57504566 A US57504566 A US 57504566A US 3368707 A US3368707 A US 3368707A
Authority
US
United States
Prior art keywords
cap
sheet
tab
container
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
US575045A
Other languages
English (en)
Inventor
Robert T Johnson
Gaylord W Brown
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.)
Brown Machine Company of Michigan Inc
Koehring Co
Original Assignee
Brown Machine Company of Michigan 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 Brown Machine Company of Michigan Inc filed Critical Brown Machine Company of Michigan Inc
Priority to US575045A priority Critical patent/US3368707A/en
Priority to GB38861/67A priority patent/GB1139659A/en
Priority to FR118924A priority patent/FR1546626A/fr
Priority to DE1679941A priority patent/DE1679941C3/de
Application granted granted Critical
Publication of US3368707A publication Critical patent/US3368707A/en
Assigned to KOEHRING COMPANY, A CORP. OF DE reassignment KOEHRING COMPANY, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KOEHRING COMPANY A WI CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • 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
    • B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
    • B65D41/46—Snap-on caps or cap-like covers
    • B65D41/48—Snap-on caps or cap-like covers non-metallic, e.g. made of paper or plastics
    • B65D41/485—Snap-on caps or cap-like covers non-metallic, e.g. made of paper or plastics with integral internal sealing means
    • 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
    • B65D2401/00—Tamper-indicating means
    • B65D2401/15—Tearable part of the closure
    • B65D2401/35—Vertical or axial lines of weakness

Definitions

  • This invention relates to differential pressure formed synthetic plastic caps with integral lifting tabs and more particularly to caps which are particularly adapted for use on throwaway milk containers and the like and which require no score lines to insure that, when the tab is torn in the body of the cap, it will not be torn away from the cap and so be ineffective to lift the cap from the container' So far as we are aware, no one has successfully differentially pressure formed container caps having lifting tabs formed in part by tearing, although caps having tear tabs have been formed of metal. Such metal caps have employed score lines or portions where the material was decreased in thickness to insure that the tab would tear in the proper manner and along desired lines.
  • One of the prime objects of the present invention is to provide a plastic cap of this nature which may be thermo-formed from a thermoplastic material and which requires no scoring. As those versed in the art will appreciate, it would be extremely difiicult and, in fact, impractical to attempt to form score lines of reduced thickness in a differential pressure formed plastic cap.
  • the invention is concerned with our discovery that if the cap formed is so oriented in the sheet that the projecting side edges of the tab extend from the container enclosing skirt of the cap substantially in alignment with the direction in which the plastic sheet was extruded, a portion of the tab will be torn from the cap when the tab is pulled upwardly which has substantially p'aralled edges extending substantially in alignment with the direction of sheet extrusion and forming a continuation of the edges of the originally projecting tab.
  • the direction of tear is not so oriented with respect to the flow of material during extrusion the lifting tab will simply be torn away from the cap without performing its cap-lifting function and the cap is thereby rendered useless for repetitive use.
  • One of the prime objects of the invention is to provide a suitable cap for throwaway milk containers wherein an insert disk serves as a stop for the tear tab and the cap may be replaced on the container until the supply of liquid in the container is depleted and the container is discarded.
  • FIGURE 1 is a perspective plan view illustrating the plastic container cap of my invention, with the lifting tab being shown in raised position;
  • FIGURE 2 is a sectional elevational view of a cap mounted on the upper end of a typical container
  • FIGURE 3 is a top plan view of a container cap which has been formed in a sheet of plastic material, the arrow indicating the direction in which the extrusion of the material occurred and the diagrammatic lines indicating the tab which will be punched out with the cap;
  • FiGURE 4 is 'a top plan view showing the cap punched or cut from the plastic web in which it was thermoformed;
  • FIGURE 5 is a perspective plan view illustrating what "ice occurs when the direction of tear is not in alignment with the direction of extrusion.
  • a letter P generally illustrates a plastic sheet in which a container cap generally designated C has been differentially pressure formed.
  • a number of differential pressure forming machines are presently on the market and may be employed to form such caps in sheets of thermoplastic material such as polystyrene, polyethylene, and polypropylene.
  • the sheet P is polystyrene of about .015 inch in thickness intially which during forming is stretched out so that it is about .010 inch in thickness. Sheets in the thickness range .010.030 of an inch will be acceptable for our purposes to form a flexible cap.
  • a suitable differential pressure forming machine is disclosed in the present assignees copending application Ser. No.
  • the cap includes a top wall 11 which is provided with an outer surrounding skirt 12 adapted to snugly enclose the neck portion of the milk container which is shown at 13 in FIGURE 2.
  • the top wall 11 is recessed as at 14 and the inner marginal wall 15 so formed is provided with a slightly undercut portion of increased diameter 15a to receive and retain an insert disk 16 which may be formed of heavy gauge paper or another suitable material and upon which the identity of the dairy and identity of the contents of the container may be printed in the usual manner.
  • the disk 16 may be inserted before or after the cap C is severed from the sheet P.
  • the lifting tab 10 which is formed has parallel side edges 10a and 10b and it is desired, when the lifting tab is raised, that the top wall 11 and wall 15 be torn along parallel imaginary lines 17 and 18 which continue from the lines 1011 and 10b, respectively.
  • the side edges 10a and 10b so oriented with respect to the direction x in which the sheet P was extruded and in which the flow of material occurred, the material of the Walls 11 and 15 will be parallelly torn when the tab 10 is lifted from the position shown in diagrammatic lines in FIGURE 2 to the raised position in which it is shown in solid lines. Since the insert disk 16 prevents further tearing of the plastic cap, further upward pulling on the lifting tab 10 will lift the entire cap C from the neck of the container 13.
  • the portions of the cap C which are torn away when the tab 10 is lifted are respectively indicated at 12', 11' and 15, and these numerals refer to the portions of the walls 12, 11 and 15 which are torn away and become in effect a functional part of the lifting tab 10 when the tab 10 is initially raised to remove the cap C.
  • the cap C may be very simply replaced on the container and the tab 10 restored to the position in which it is shown in broken lines in FIGURE 2.
  • T 0 again remove cap C it is, of course, merely necessary to lift the tab 10 as before and exert the upward pull which again removes the cap C from the container. While, in the present instance, we have formed what might be termed a thin-walled cap for throwaway containers out of thin gauge polystyrene sheet, it is to be understood that other synthetic plastic materials will be suitable for our purpose.
  • a method of making a thin-walled plastic container cap comprising: differential pressure forming a cap, With a surrounding skirt adapted to fit on a container top, in a heated, deformable, extruded plastic sheet portion; and severing the cap from the sheet to provide a tab portion extending from the skirt, the tab being so oriented with respect to the sheet portion that its projecting side edges extend from the skirt substantially in alignment with the direction in which the plastic sheet was extruded and, when the cap is applied to a container and the tab is lifted with respect to the skirt, the tab tear-s a portion from the skirt having substantially parallel edges extending substantially in the said direction of sheet extrusion.
  • a thin-walled plastic container cap thermoformed in an extruded plastic sheet comprising: a top wall having a surrounding dependent unscored skirt adapted to fit on the neck of a container; and a projecting tab portion exten-ding from said skirt with its side edges extending substantially in alignment with the direction of extrusion of said sheet so that the tab portion, when lifted from the skirt, tears a portion from the skirt having substantially parallel edges extending substantially in the said direction of sheet extrusion.
  • stop means is integrated with said cap to halt tearing thereof at a predetermined location thereon spaced inwardly from said projecting tab portion.
US575045A 1966-08-25 1966-08-25 Differential pressure formed plastic container cap or closure Expired - Lifetime US3368707A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US575045A US3368707A (en) 1966-08-25 1966-08-25 Differential pressure formed plastic container cap or closure
GB38861/67A GB1139659A (en) 1966-08-25 1967-08-23 Differential pressure formed plastics container cap or closure
FR118924A FR1546626A (fr) 1966-08-25 1967-08-24 Procédé de mise en forme par pression différentielle de bouchons pour récipientsen matière plastique et bouchons ainsi obtenus
DE1679941A DE1679941C3 (de) 1966-08-25 1967-08-24 Aus einer Kunststoff-Folienbahn hergestellte Verschlußkappe für Behälter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US575045A US3368707A (en) 1966-08-25 1966-08-25 Differential pressure formed plastic container cap or closure

Publications (1)

Publication Number Publication Date
US3368707A true US3368707A (en) 1968-02-13

Family

ID=24298707

Family Applications (1)

Application Number Title Priority Date Filing Date
US575045A Expired - Lifetime US3368707A (en) 1966-08-25 1966-08-25 Differential pressure formed plastic container cap or closure

Country Status (3)

Country Link
US (1) US3368707A (de)
DE (1) DE1679941C3 (de)
GB (1) GB1139659A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3654003A (en) * 1969-05-14 1972-04-04 Peter S Bag Corp Method of molding hollow article with molded-in fastener
EP0049413A1 (de) * 1980-10-06 1982-04-14 The Continental Group, Inc. Verschluss
US4747509A (en) * 1985-12-13 1988-05-31 Wmf Container Corporation Lid with detachable segment
US5069345A (en) * 1990-09-24 1991-12-03 Hoover Universal, Inc. Plastic container with tear opening feature
US5251770A (en) * 1992-05-06 1993-10-12 Broadway Companies, Inc. Container and pressure sealing closure combination
US20100230375A1 (en) * 2009-03-10 2010-09-16 Eric William Gruenwald Water bottle with dosage cup

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015000708U1 (de) 2015-01-30 2015-03-02 Axel R. Hidde Verpackung für eine Kaffeesahne-/Kondensmilch-Portionspackung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3286875A (en) * 1963-11-01 1966-11-22 Continental Can Co Easy-opening ring and plug closure
US3302854A (en) * 1961-09-26 1967-02-07 Sweetheart Plastics Cluster of covers
US3338445A (en) * 1965-10-15 1967-08-29 American Flange & Mfg Container and cap with reclosable tear strip

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302854A (en) * 1961-09-26 1967-02-07 Sweetheart Plastics Cluster of covers
US3286875A (en) * 1963-11-01 1966-11-22 Continental Can Co Easy-opening ring and plug closure
US3338445A (en) * 1965-10-15 1967-08-29 American Flange & Mfg Container and cap with reclosable tear strip

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3654003A (en) * 1969-05-14 1972-04-04 Peter S Bag Corp Method of molding hollow article with molded-in fastener
EP0049413A1 (de) * 1980-10-06 1982-04-14 The Continental Group, Inc. Verschluss
US4747509A (en) * 1985-12-13 1988-05-31 Wmf Container Corporation Lid with detachable segment
US5069345A (en) * 1990-09-24 1991-12-03 Hoover Universal, Inc. Plastic container with tear opening feature
US5251770A (en) * 1992-05-06 1993-10-12 Broadway Companies, Inc. Container and pressure sealing closure combination
US20100230375A1 (en) * 2009-03-10 2010-09-16 Eric William Gruenwald Water bottle with dosage cup
US8479936B2 (en) * 2009-03-10 2013-07-09 Eric William Gruenwald Water bottle with dosage cup

Also Published As

Publication number Publication date
DE1679941C3 (de) 1974-02-28
GB1139659A (en) 1969-01-08
DE1679941B2 (de) 1973-08-09
DE1679941A1 (de) 1971-04-29

Similar Documents

Publication Publication Date Title
US4694960A (en) Tear open blister package
US4322015A (en) Container lid
US4209126A (en) Patch top closure member including a monoaxially oriented film layer
US4787517A (en) Easily opened and reclosable bag with tear-guiding ridges
US2329360A (en) Package openable by tearing
US3098594A (en) Container for shipping, storing and dispensing sheet material in predetermined lengths
US4300682A (en) Blister package
US3323707A (en) Tear-open package
US3426959A (en) Packaging assembly
US2333587A (en) Fold-closed package
US4754890A (en) Tamper evident safety seal
US4549657A (en) Easily opened and reclosable bag and apparatus for making same
US4501371A (en) Tamper indicating, non-resealable closure
US3108708A (en) Sealed plastic containers
US3317068A (en) Tear-open sealed containers and closures therefor
US2806620A (en) Bottle capsules
EP0531813A1 (de) Öffnungseinrichtung für eine Packung
US4822326A (en) Method of forming a tamper evident sealing liner
US2851212A (en) Opening device for bags
US3368707A (en) Differential pressure formed plastic container cap or closure
US3979003A (en) Re-usable frangible closure
GB2027664A (en) A Tear-open Container Closure
US4915236A (en) Cardboard and plastic composite parallelopipedal container for liquid
US2891713A (en) Container
US4512478A (en) Paperboard carton with improved perforated opening and method of making same

Legal Events

Date Code Title Description
AS Assignment

Owner name: KOEHRING COMPANY 200 EXECUTIVE DRIVE, BROOFIELD, W

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KOEHRING COMPANY A WI CORP.;REEL/FRAME:003995/0514

Effective date: 19810505