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US3362571A - Container with tear open seal - Google Patents

Container with tear open seal Download PDF

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Publication number
US3362571A
US3362571A US569627A US56962766A US3362571A US 3362571 A US3362571 A US 3362571A US 569627 A US569627 A US 569627A US 56962766 A US56962766 A US 56962766A US 3362571 A US3362571 A US 3362571A
Authority
US
United States
Prior art keywords
container
lid
thread
flange
tear
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
US569627A
Other languages
English (en)
Inventor
Kuhne Alois
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.)
Alcan Holdings Switzerland AG
Original Assignee
Alusuisse Holdings AG
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 Alusuisse Holdings AG filed Critical Alusuisse Holdings AG
Application granted granted Critical
Publication of US3362571A publication Critical patent/US3362571A/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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/42—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions with cutting, punching, or cutter accommodating means
    • B65D17/46—Wires, strings or the like, e.g. rip cords
    • B65D17/462—Tearing-strips or -wires

Definitions

  • the present invention has to do with such a container comprising a cup-like body having at its upper rim an outwardly bent sealing flange, and a lid the border flange of which is welded or heat-sealed to the sealing flange by means of a plastic material.
  • the containers are manufactured from plastic material, e.g. polyethylene, or from aluminum foil, the latter being known as hard foil containers, and which may have a thickness of up to 0.18 mm. Both body and lid are coated with a layer of, for instance, polyethylene which under pressure and heat causes the sealing of the sealing flange to the border flange.
  • Tear-open threads for such containers have not been used previously, since they cannot be laid within the welded or heat-sealed closure and since such a thread simply laid on the sealing flange within the welded or heat sealed seam does not serve the purpose.
  • the thread has to be fixed to the container in a manner which will enable it to cut the lid along the predetermined line and not to be simply torn out when pulled.
  • the tearopen wire can be placed within the fold of the closure.
  • the present invention now gives the possibility of providing containers with a flange-to-flange seal with a serviceable tear-open seal and tear-open thread.
  • a tear-open thread is applied to the wall of the depressed central portion of the lid extending inside the container body exteriorly of the former wall, and facing the wall of the container body, the ends of this thread coming to the exterior of the container between the sealing flange of the body and the border flange of the lid.
  • the tearing of the thread effects the cutting of a neat and defined line along the edge between the border flange of the lid and the wall of the depressed portion of the lid.
  • the thread is also fixed by the depression of the lid and does not deviate on tearing.
  • the depression of the lid extends over the entire opening of the container body.
  • the tear-open thread of such a container has to meet rather severe requirements, especially in the case of hard foil containers. It has to resist elevated temperatures, the sealing of the container being performed at about 230 C. The breaking strength is of importance as sheet material of 100 mg and more has to be cut. Moreover this type of container is often sterilized, and swelling of the thread in hot water must be avoided. Furthermore the leading of the thread out from between the flanges has to be considered: it must be suificiently tight.
  • the tear-open thread is made from twisted single threads of synthetic material which are either spun or extruded.
  • twisted cotton threads as used with cardboard containers do not serve the purpose as they are damaged by the necessary heat sealing temperatures, swell during sterilization and have insufficient breaking strength.
  • One single whole extruded thread or wire made from a material with sufficient resistivity to elevated temperatures and to water during sterilization, viz. from synthetic material is also unsuitable as it is flattened between the flanges when heat sealed, loses its breaking strength or cannot be pressed tightly into the sealing seam.
  • a twisted thread from synthetic material does not lose its breaking strength even when flattened and can be pressed into the sealing seam without impairing its tightness, the single threads being lain adjacent to each other and are therefore undamaged.
  • Threads from synthetic polyester materials known under the registered names of Terylene, Trevira, Dacron etc. are especially suitable for the purpose.
  • FIG. 1 is a cross-sectional view of a container with tear open thread
  • FIG. 2 is a top plan view of the same container.
  • FIG. 3 is a fragmentary cross-sectional view showing a modified form of construction of the portion shown at A in FIG. 1.
  • a cup-shaped container body 1 manufactured by deepdrawing in the usual manner has at its upper rim portion a sealing flange 2. While the container is shown in the drawing with circular ground-plan, it may be of oval, angular, or of any other shape.
  • a lid 3 of corresponding shape has a border flange 4 which is welded or heat-sealed to the sealing flange 2 by pressure and heat.
  • the container body and lid may be made from synthetic material, e.g. polyethylene, or from aluminum foil, or the body may be made from one and the lid from another material.
  • the invention is especially advantageous for containers, the body and lid of which are made from aluminum foil. In this case body and lid are heat-sealed in a well known manner by means of an intermediate layer of synthetic material. It is preferable to coat the container body and lid with polyethylene. When sealed by means of a heat-sealing device, the sealing and border flanges are pressed together, the coating melting within the reach of the sealing flange and resulting in a strong and tight seal.
  • the lid 3 has a depression 10 extending over the entire opening of the container body 1. Against a substantially vertical wall of this depression, facing the wall of the container body, the tear open thread 5 is placed.
  • the depression of the lid serves advantageously to keepthe container body dustproof, as the lid can be readily reset after being opened.
  • the rim of the container body has a corresponding ridge 6 as shown in FIG. 1.
  • the depression 10 is shaped with an additional bend 7 protruding above the border flange 4.
  • the line of cutting follows this bend thus permitting an easier grip to remove the lid.
  • the two ends of the tear-open thread 5 are led out between the sealing flange 2 0f the body and the border flange 4 of the lid.
  • the sealing flange 2 is curved inwards at its edge as shown at 8, which serves merely to avoid a sharp edge of the flange and injuries caused thereby, but
  • the lid may be entirely removed if the ends of the thread are led out at the same place, or, it may remain connected to the container body if the ends of the thread are led out apart as shown in FIG. 2. It is also possible to unite the two ends of the thread in the same pull tab.
  • the invention accordingly comprises an article of manufacture possessing the features, properties, and the relation of elements which will be exemplified in the articles hereinafter described and the scope of the application of which will be indicated in the claims.
  • a container with a tear-open seal comprising a cupshaped container body with an outwardly-bent sealing flange at its open end, a lid with a depressed central portion and with a border flange sealed to the sealing flange by means of an intermediate layer of material, and a tearopen thread applied exteriorly of said depressed central portion, the lid extending into the open end of the container body, and the ends of thread being led to the exterior of the container between the border flange of the lid and the sealing flange of the container body.
  • a container according to claim 1 wherein the depressed portion of the lid is formed at its periphery with a bend protruding to a level above that of the border flange.
  • a container according to claim 1 wherein the depressed portion of the lid is formed with a substantially vertical wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Closures For Containers (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
US569627A 1965-08-09 1966-08-02 Container with tear open seal Expired - Lifetime US3362571A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1115865A CH426617A (de) 1965-08-09 1965-08-09 Behälter mit Aufreissverschluss

Publications (1)

Publication Number Publication Date
US3362571A true US3362571A (en) 1968-01-09

Family

ID=4370654

Family Applications (1)

Application Number Title Priority Date Filing Date
US569627A Expired - Lifetime US3362571A (en) 1965-08-09 1966-08-02 Container with tear open seal

Country Status (9)

Country Link
US (1) US3362571A (xx)
BE (1) BE685217A (xx)
CH (1) CH426617A (xx)
DE (1) DE1536304B2 (xx)
DK (1) DK114114B (xx)
GB (1) GB1091387A (xx)
NL (1) NL151949B (xx)
NO (1) NO118208B (xx)
SE (1) SE305178B (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604615A (en) * 1967-12-06 1971-09-14 Forvaltnings Ab Acta Sealed packaging unit with tear string
US3799389A (en) * 1971-11-19 1974-03-26 Alusuisse Packaging container with tear-open thread
US5251758A (en) * 1991-07-15 1993-10-12 Liblan & Co., Ltd. Food container with grippable portion having sense of touch indicia

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8708344B2 (en) 2012-10-02 2014-04-29 GM Global Technology Operations LLC Sealed assemblies and methods of unsealing same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739732A (en) * 1950-10-30 1956-03-27 Bogner Peter Rip-wire can closures
US2903179A (en) * 1957-04-24 1959-09-08 John F Vanhoof Self-contained opener for containers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739732A (en) * 1950-10-30 1956-03-27 Bogner Peter Rip-wire can closures
US2903179A (en) * 1957-04-24 1959-09-08 John F Vanhoof Self-contained opener for containers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604615A (en) * 1967-12-06 1971-09-14 Forvaltnings Ab Acta Sealed packaging unit with tear string
US3799389A (en) * 1971-11-19 1974-03-26 Alusuisse Packaging container with tear-open thread
US5251758A (en) * 1991-07-15 1993-10-12 Liblan & Co., Ltd. Food container with grippable portion having sense of touch indicia

Also Published As

Publication number Publication date
CH426617A (de) 1966-12-15
DE1536304A1 (de) 1970-01-08
GB1091387A (en) 1967-11-15
DK114114B (da) 1969-05-27
NL151949B (nl) 1977-01-17
DE1536304B2 (de) 1976-10-07
NL6611195A (xx) 1967-02-10
SE305178B (xx) 1968-10-14
BE685217A (xx) 1967-01-16
NO118208B (xx) 1969-11-24

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