US3572579A - Scored peripheral tear strip with reclosure lid - Google Patents

Scored peripheral tear strip with reclosure lid Download PDF

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Publication number
US3572579A
US3572579A US815416A US3572579DA US3572579A US 3572579 A US3572579 A US 3572579A US 815416 A US815416 A US 815416A US 3572579D A US3572579D A US 3572579DA US 3572579 A US3572579 A US 3572579A
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United States
Prior art keywords
lid
container
tab
score
die
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
US815416A
Inventor
David Charles Mueller
Peter Floyd Niesen
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Rexam Beverage Can Co
Original Assignee
American Can Co
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Publication date
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Publication of US3572579A publication Critical patent/US3572579A/en
Assigned to AMERICAN CAN PACKAGING INC. reassignment AMERICAN CAN PACKAGING INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN CAN COMPANY, A NJ CORP.
Assigned to AMERICAN NATIONAL CAN COMPANY reassignment AMERICAN NATIONAL CAN COMPANY MERGER (SEE DOCUMENT FOR DETAILS). Assignors: AMERICAN CAN PACKAGING INC., NATIONAL CAN CORPORATION (CHANGED TO), TRAFALGAR INDUSTRIES, INC. (MERGED INTO)
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D43/00Lids or covers for rigid or semi-rigid containers
    • B65D43/02Removable lids or covers
    • B65D43/0235Removable lids or covers with integral tamper element
    • B65D43/0264Removable lids or covers with integral tamper element secured only by friction or gravity before removal of the tamper element
    • B65D43/0268Removable lids or covers with integral tamper element secured only by friction or gravity before removal of the tamper element on both the inside and the outside of the mouth of the container
    • B65D43/027Removable lids or covers with integral tamper element secured only by friction or gravity before removal of the tamper element on both the inside and the outside of the mouth of the container leaving only an inside friction after removal of the tamper element
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/542Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow bottoms to open ends of container bodies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/545Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles one hollow-preform being placed inside the other
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2401/00Tamper-indicating means
    • B65D2401/60Tearable part both of the container and of the closure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2543/00Lids or covers essentially for box-like containers
    • B65D2543/00009Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00018Overall construction of the lid
    • B65D2543/00064Shape of the outer periphery
    • B65D2543/00074Shape of the outer periphery curved
    • B65D2543/00092Shape of the outer periphery curved circular
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2543/00Lids or covers essentially for box-like containers
    • B65D2543/00009Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00018Overall construction of the lid
    • B65D2543/00259Materials used
    • B65D2543/00296Plastic
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2543/00Lids or covers essentially for box-like containers
    • B65D2543/00009Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00425Lids or covers welded or adhered to the container
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2543/00Lids or covers essentially for box-like containers
    • B65D2543/00009Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444Contact between the container and the lid
    • B65D2543/00481Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/0049Contact between the container and the lid on the inside or the outside of the container on the inside, or a part turned to the inside of the mouth of the container
    • B65D2543/00509Cup
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2543/00Lids or covers essentially for box-like containers
    • B65D2543/00009Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444Contact between the container and the lid
    • B65D2543/00481Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/00537Contact between the container and the lid on the inside or the outside of the container on the outside, or a part turned to the outside of the mouth of the container
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2543/00Lids or covers essentially for box-like containers
    • B65D2543/00009Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444Contact between the container and the lid
    • B65D2543/00481Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/00537Contact between the container and the lid on the inside or the outside of the container on the outside, or a part turned to the outside of the mouth of the container
    • B65D2543/00546NO contact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2543/00Lids or covers essentially for box-like containers
    • B65D2543/00009Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00444Contact between the container and the lid
    • B65D2543/00481Contact between the container and the lid on the inside or the outside of the container
    • B65D2543/00555Contact between the container and the lid on the inside or the outside of the container on both the inside and the outside
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2543/00Lids or covers essentially for box-like containers
    • B65D2543/00009Details of lids or covers for rigid or semi-rigid containers
    • B65D2543/00824Means for facilitating removing of the closure
    • B65D2543/00833Integral tabs, tongues, handles or similar
    • B65D2543/00842Integral tabs, tongues, handles or similar outside of the lid
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2577/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10Container closures formed after filling
    • B65D2577/20Container closures formed after filling by applying separate lids or covers
    • B65D2577/2075Lines of weakness or apertures
    • B65D2577/2083Lines of weakness or apertures in container flange
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D2577/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10Container closures formed after filling
    • B65D2577/20Container closures formed after filling by applying separate lids or covers
    • B65D2577/2075Lines of weakness or apertures
    • B65D2577/2091Lines of weakness or apertures in cover
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S206/00Special receptacle or package
    • Y10S206/807Tamper proof
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S229/00Envelopes, wrappers, and paperboard boxes
    • Y10S229/927Means for tearing or breaking rigid or semirigid thermoplastic container

Definitions

  • a container having been scaled, reaches the consumer, it is advantageous for the consumer to be able to open the container without having to apply any specific tools such as knives or can openers.
  • a container of the preceding species should be a low-cost item which is disposable and which is chemically inert in relation to the contents to be stored within the container. Accordingly, the manufacturing process by which the container and lid or closure are fabricated should be simple, low in cost, and adaptable to large volume production 'at high speed.
  • a specific object of the present invention is to form a tear strip from the sealed flanges of the container and lid b applying offset scores to the container and lid.
  • a further object of the present invention is to provide a process by which a thermoplastic container'and lid are heatsealed together through flanges provided on the container and lid, and applying simultaneously hot scoring knives to form a line of weakness and thereby facilitate severance of the sealed flanges for opening the container.
  • Another object of the present invention is to apply a trimming and curling operation through essentially one method step after the flanges of the container and lid have been sealed and scored.
  • thermoplastic container package in which an open-ended container is providedwith a flange portion adjoining the rim of the open end of the container. This flange portion is severable from the container rim along a score surrounding the open end of the container.
  • a lid for closing the open end of the container is also provided with a lid flange juxtaposed on the flange of the container.
  • a tab portion extends from the rim of the lid and is integral with the lid. The tab facilitates removal of the lid from the container and replacement of the lid on the container for its reclosure.
  • the lid flange portion surrounds the lid and is severable from the latter along a score. This score on the lid, however, does not pass through the tab, so that the tab is not readily severed from the lid.
  • the scores in the lid flange and the container flange are slightly offset in relation to each other and designed so that the heat-sealed flanges form a tear strip which may be readily severed from the container package for the purpose of opening the container.
  • thermoplastic containers and lids preformed from a flat sheet are transferred to a die station which clamps together the flanges of the lid and container and applies heat so that the lid and container become permanently sealed together in the flange area.
  • hot scoring knives are forced into the flanges to impress offset scores into both the lid flange and the container flange.
  • the sealed flanges are trimmed and curled so as to form a compact container package.
  • FIG. I is a sectional elevational view of the die stations in which the container and lid are sealed together, scored, trimmed and curled, and shows the die stations in the inoperative or open positions for receiving the container and lid prior to processing, in accordance with the present invention
  • FIG. 2 is a sectional elevational view of the die stations of FIG. 1 when in the operative or closed positions for carrying out the method steps of the present invention
  • FIG. 3 is a partial plan view taken along line 3% in FIG. I and shows the method by which heat is applied to the sealing portions of the die stations and the scoring knives;
  • FIG. 4 is a partial view-taken along line 4-4 in FIG. I and shows the cooperatingheating and scoring arrangement lying cooperatively opposite the arrangement of FIG. 3',
  • FIG. 5 is an enlarged fragmentary view taken along line 5-5 in FIG. 2, and shows the method by which the flanges of the container and lid are heat-sealed together and scored in one operation;
  • FIG. 6 is an enlarged fragmentary view taken along line 6-6 in FIG. 2, and shows the trimming and curling operation forforrning the container and lid into a compact package;
  • FIG. 7 is an isometric view of the combined container and lid when heat-sealed together
  • FIG. 8 is a sectional view taken along line 8-8 in FIG. 7, and shows the relationship of the heat-sealed flanges with their offset scores;
  • FIG. 9 is a sectional view taken along line 9-9 in FIG. 7, and shows the relationship of tab portions on the lid flange and container flange heat-sealed together and forming a tear strip;
  • FIG. 10 is a sectional view taken along line Ill-I0 in FIG. 7, and shows the relationship between the tab on the lid and the corresponding tab portion on the container, as well as the ofl set scores thereon.
  • a plurality of preformed containers 10 which have been formed from a thermoplastic sheet of material, are fed into a set of processing dies 12.
  • the containers 10 project from a sheet or web of assembled units.
  • the containers 10 may be prefonned from a single sheet which may contain, for example, an aggregate of eight container units.
  • the covers 11 for these containers are similarly preformed from a sheet Ila of thermoplastic material so that a corresponding number of covers are made available and super-imposed over the containers preparatory to sealing the covers onto the containers.
  • the containers I0 are formed from the sheet 10a, whereas the covers are formed from the overlying thermoplastic sheet 11a.
  • the superimposed covers and containers are fed or transferred through a die set l2 wherein the operations of sealing and trimming the containers are carried out.
  • the die set 12 includes two die stations, 12a and 12b, the first of these being die station wherein heat is applied to the assembly for sealing the lid to the container and scoring lines are impressed in the assembly by which the plastic lid or cover may be readily removed to subsequently gain access to the contents within the container.
  • the feeding or transfer of the webbed containers and covers or lids through the die stations 12a and I2! may be accomplished through conventional transfer and conveying means.
  • the die set 12 has a fixed upper plate 14 and a movable lower plate 16. The latter is guided in its motion with respect to the upper plate 14 through guide rods or shafts 18 which are fixed to the plate 14 and are inserted within bearings 19 of the lower movable die plate 16. These guide rods 18 guide the movable plate 16 so that it is maintained in proper alignment with respect to the upper plate 14. Accordingly, the bearings 19 are slidably movable along the guide rods or guide shafts 18.
  • the container has tapered sides terminating in a flanged rim 10b at its open end.
  • the closed bottom of the container is integral with the sides of the container.
  • a bead 10c surrounds the tapered sides of the container for purposes of reinforcement.
  • the lid 11 of the container has a flanged rim 11b which extends over and lies directly above the flange 10b and in contact therewith.
  • a tear strip 11c also shown in FIG. 7, surrounds the container along the lid.
  • the tear strip 11c includes a portion of the lid and container which may be readily severed from the main body of the assembly through a score which has been applied during the sealing operation in which the lid is sealed onto the container.
  • the tear strip 11c terminates in two tabs 11d and Me which lie on opposite sides of the tab 11f. The presence of these two tabs 11d and 11e on the tear strip facilitate the tearing of this strip from either side of the tab 11f.
  • the strip will tear from the assembly in a clockwise direction, when viewed from the top of the lid.
  • the tab 112 is similarly gripped, the strip will tear from the assembly in a counterclockwise direction.
  • the lower movable plate 16 is moved upward until the die sections 20 and 22 are brought together as shown in detail in FIG. 5. in this position of the die sections, the flange portions 10b of the container and 11b of the lid are directly pressed together. Extensions of these two flange portions are heat-sealed to each other by the die sealing portions 20a and 22b.
  • Heating coils 24 and 26 within the die sections 20 and 22, respectively. These heating coils are held within recesses of the die sections and surround the container and lid to be sealed thereto.
  • the heating coil 24, for example, is retained within the groove or recess 28 through a retaining plate 30 secured to the upper die section 20 by a threaded screw device 32, for example.
  • a similar structural arrangement applies to the heating coil 26.
  • the heating coils may contain conventional heating elements 34 which have terminals 36 to which electrical energy may be supplied in the customary manner.
  • an ejection plunger 38 is provided.
  • the plunger 38 is acted upon by a spring 40 which tends to maintain the plunger 38 in an upward position, in which the container I0 is ejected from the interior of the die section 22.
  • a cup-shaped member 42 is mounted on the plate 16 so that one end of the spring 40 can abut the interior of this cup-shaped member.
  • the tapered portion 22c of the die section serves to locate the container accurately during the processing operations.
  • such tapered surfaces have the inherent characteristic of clinging or adhering to each other at the interface.
  • the tapered surface of the container wall tends to inherently cling to or stick to the tapered surface of the die section.
  • scores are also applied to these flanges through scoring knives 44 and 46.
  • the upper and lower scoring knives are offset from each other so that scores 11g and 10d are applied to the lid and container, respectively, in an offset manner. These scores are applied for the purpose of facilitating the removal of the tear strip llc from the container assembly.
  • the tear strip is composed of an extended portion of the lid flange 11b and the container flange 10b. This combined structure of the tear strip results from these two extended flange portions being heat-scaled together, as previously described. Accordingly, the composite tear strip may be removed as a unit by severing along the scores 10d and Hg.
  • the knives 44 and 46 are held in contact with the die sections retaining the heating coils 24 and 26.
  • the upper scoring knife 44 is held in place by a retaining ring 48 which presses the scoring knife firmly against the portions 200 of the die section so as to maintain the scoring knife properly located.
  • the scoring knife 44 and retaining ring 48 have ring-shaped or annular cross sections.
  • the scoring knife 46 is held in place and pressed against the die portion 22b by the tapered die portion 22c which also serves the purpose of locating the container at the first die station. Since the die portions 200 and 22b are maintained at an elevated temperature by the heating coils 24 and 26, the scoring knives 44 and 46 are also heated as a result of being in contact with the die portions 200 and 22b. The heating of these scoring knives 44 and 46 facilitates the formation of the scores 10d and 11g when the die sections are brought together.
  • the scores 10d and llg are offset relative to each other to increase the structural strength of the partitioning portion which partitions the tear strip 11c from the container and lid.
  • the tear strip could accidentally sever from the container assembly because of the small amount of material left between the vcrtices of the scores.
  • a substantially larger amount of material or thickness is left between the vertex of each score and the oppositely lying exterior surface.
  • this added thickness of the material on the opposite side of the score greater structural strength of the score is realized.
  • no substantially greater force is required to sever the tear strip from the container and lid combination.
  • the tear strip may be nearly as readily removed with the offset scores as with the design in which the scores are aligned and directly facing each other.
  • the flange portion of the container beneath the tab 11f is scored because the score 10d is continuous and forms a closed path or closed score.
  • the score 11g is discontinuous in the respect that it does not extend over the tab llf. The discontinuity in this score is necessary to maintain the tab 11f firmly secured to and integralwith the lid proper. If the score Hg, for example, were to be continuous in a manner similar to that of the score d, the tab 11f couldreadily sever from its lid when pulled upward for the purpose of opening the container. If the tab were thus severed from the lid, it would then make removal of the lid somewhat difficult, for prying might be required at the interface of the lid and container to remove the lid in the absence of the tab. Accordingly, the score Hg is continuous with the exception of the-portion which extends across the tab 11f.
  • the scored tab of the container beneath the lid tab 11f will tend to remain attached to the container rim because the score through this lower tab is not severed when the tear strip is removed.
  • the force applied to this tab by the gripping fingers for example, will tend to be sufficient to sever the connection between the lower tab and the container rim. Since this lower tab is heat-sealed to the under side of the cover tab 11f, it will be removed with the lid and will thereafter be a portion of the lid, serving thereby to give the tab 11f a double thickness.
  • the die sections are parted through the downward motion of the plate 16, and the combined container and lid are transferred from the first die station 12a to the second die station 12b. ln this second die station a curling operation is applied to the sealed flanges of the container and lid, after trimming or severing from the webs from which the container and lid were preformed.
  • the trimming and curling operation is shown in detail in FIG. 6.
  • the upper die section 50 at the second die station has a trimming or cutoff portion 50a.
  • the trimming or cutoff portion 500 When the lower die portion 52 is brought upward to mate with the upper die section 50, the trimming or cutoff portion 500 will sever the portion 11h from the tear strip llc. This trimming or cutoff operation may also serve to sever the sealed lid and container from the respective webs 10a and 11a. As the die section 52 proceeds in its upward stroke or movement, the remaining portion of the sealed flanges are curled over the die portion 52a, as a result of the relative action between the trimming and curling die portion 50a and the curling portion 52a.
  • the sealed flange portions are forced to curl over the die portion 52a, and thereby result in a curled-over portion of the tear strip which is substantially parallel to the axis of the container perpendicular to the bottom plane thereof.
  • the edge of the tear strip faces directly the horizontal surface upon which the container stands.
  • the sealed container is prevented from moving downward with the die section 52 due to the presence of the fixed ejector 54.
  • the latter is secured to the fixed guide rod 18 through a clamping bracket 56.
  • This clarn'ping bracket 56 secures the ejector 54 to the guide rod 18.
  • the die portion 50b which cooperates with the cutoff portion 500 to trim or sever the portion llh from the sealed flanges of container and lid, is
  • a thennoplastic container package comprising, in combination:
  • an open-ended container having a closed base and sides integral with said base;
  • a container flange portion adjoining the rim of the open end of said container and severable from said rim along a score surrounding the open end of said container;
  • lid tab portion extending from the rim of said lid and integral with said lid, said lid tab portion being sealed to said container flange portion adjacent and below said score surrounding the open end of said container, said lid tab portion being for removing said lid from said container by severing said score surrounding the open end of said container and for replacing said lid onto said container;
  • lid flange portion adjoining the rim of said lid and said lid tab portion, said lid flange portion being sealed to said container flange portion and severable from the rim of said lid and said tab along a score in said lid flange portion, said score surrounding the open end of said container being offset from said score on said lid flange portion.
  • thermoplastic container package as defined in claim 1 including a lid flange; tab portion integral with said lid flange portion and adjoining one side of said lid tab portion, said lid flange tab portion being severable with said lid flange portion along said score.
  • thermoplastic container package as defined in claim 2 including a further lid flange tab portion integral with said lid flange portion and adjoining the other side of said lid tab portion, said further lid flange tab'portion being severable with said lid flange portion along said score.
  • thermoplastic container package as defined in claim ll wherein said sides of said container are tapered.
  • thermoplastic container package as defined in claim 1 wherein said lid has a recess within said rim of said lid.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Abstract

A thermoplastic container and lid are heat-sealed together through clamping jaws. During the sealing operation a pair of offset scores are applied to flanges on the container and lid, which are heat-sealed. The scores facilitate severance of the sealed flanges for opening the container. Offset knives heated by the clamping jaws form the offset scores and leave a tab on the lid by which the lid may be readily removed and replaced subsequently when desired.

Description

United States Patent David Charles Mueller Neenah, Wis.;
Peter Floyd Niesen, Mound, Minn. 815,4 I6
Apr. I1, 1969 Mar. 30, 1971 American Can Company New. York, NY.
Inventors Appl. No. Filed Patented Assignee SCORED PERIPHERAL TEAR STRIP WITH RECLOSURE LID 5 Claims, 10 Drawing Figs.
Int. Cl. 865d 17/24 Field of Search 229/5 I [56] References Cited UNITED STATES PATENTS 2,998,158 8/1961 Tupper 220/54 3,347,407 10/ l 967 Coolidge 220/54 Primary Examiner-George T. Hall Att0rneys-Kenneth I-l. Murray, Robert P. Auber and Leonard R. Kohan ABSTRACT: A thermoplastic container and lid are heatsealed together through clamping jaws. During the sealing operation a pair of offset scores are applied to flanges on the container and lid, which are heat-sealed. The scores facilitate severance of the sealed flanges for opening the container. Offset knives heated by the clamping jaws form the offset scores and leave a tab on the lid by which the lid may be readily removed and replaced subsequently when desired.
FIG/l Patented March 30, 1971 2 Sheets-Sheet l INVENTORS AVID CH ES MUELLER gTER F D NIESEN .ATTO NEY Patented March 30, 1971 2 Sheets-Sheet 2 INVENTORS ARLES MUELLER ATTORNEY SCGRED PERIPHERAL TEAR STRIP WITH RECLOSURE LID BACKGROUND OF THE INVENTION In the manufacture of containers for the storage and transportation of foods or liquids, it is often required that these containers be fully sealed against the outer atmosphere after being filled with the selected contents. When such a container, a ter having been scaled, reaches the consumer, it is advantageous for the consumer to be able to open the container without having to apply any specific tools such as knives or can openers. At the same time, it is helpful to the consumer if he is not required to read elaborate instructions prior to opening the container, or to exercise skill to remove the cover or lid from the container without destroying the package or spilling its contents. It is further useful if such a container enclosing consumer products if of the disposable type so that it may be economically discarded after use. It is also essential that the container not react with the contents or contaminate the latter by dissolving impurities thereinto; Thus, a container of the preceding species should be a low-cost item which is disposable and which is chemically inert in relation to the contents to be stored within the container. Accordingly, the manufacturing process by which the container and lid or closure are fabricated should be simple, low in cost, and adaptable to large volume production 'at high speed.
It is therefore an object of the present invention to provide a container and closure equipped with flanges heat-sealed together and scored so as to facilitate removal of the sealed flanges without required special tools or skills.
It is also an object of the present invention to fonn a tab on the closure or lid by which the latter may be readily removed from the container and subsequently replaced, if desired.
A specific object of the present invention is to form a tear strip from the sealed flanges of the container and lid b applying offset scores to the container and lid.
A further object of the present invention is to provide a process by which a thermoplastic container'and lid are heatsealed together through flanges provided on the container and lid, and applying simultaneously hot scoring knives to form a line of weakness and thereby facilitate severance of the sealed flanges for opening the container.
Another object of the present invention is to apply a trimming and curling operation through essentially one method step after the flanges of the container and lid have been sealed and scored.
Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.
SUMMARY OF THE INVENTION An easy-opening thermoplastic container package in which an open-ended container is providedwith a flange portion adjoining the rim of the open end of the container. This flange portion is severable from the container rim along a score surrounding the open end of the container. A lid for closing the open end of the container is also provided with a lid flange juxtaposed on the flange of the container. A tab portion extends from the rim of the lid and is integral with the lid. The tab facilitates removal of the lid from the container and replacement of the lid on the container for its reclosure.
The lid flange portion surrounds the lid and is severable from the latter along a score. This score on the lid, however, does not pass through the tab, so that the tab is not readily severed from the lid. The scores in the lid flange and the container flange are slightly offset in relation to each other and designed so that the heat-sealed flanges form a tear strip which may be readily severed from the container package for the purpose of opening the container.
In the manufacture of the container package, thermoplastic containers and lids preformed from a flat sheet are transferred to a die station which clamps together the flanges of the lid and container and applies heat so that the lid and container become permanently sealed together in the flange area. At the same time that this sealing process takes place, hot scoring knives are forced into the flanges to impress offset scores into both the lid flange and the container flange. After the sealing and scoring process, the sealed flanges are trimmed and curled so as to form a compact container package.
DESCRIPTION OF THE DRAWINGS FIG. I is a sectional elevational view of the die stations in which the container and lid are sealed together, scored, trimmed and curled, and shows the die stations in the inoperative or open positions for receiving the container and lid prior to processing, in accordance with the present invention;
FIG. 2 is a sectional elevational view of the die stations of FIG. 1 when in the operative or closed positions for carrying out the method steps of the present invention;
FIG. 3 is a partial plan view taken along line 3% in FIG. I and shows the method by which heat is applied to the sealing portions of the die stations and the scoring knives;
FIG. 4 is a partial view-taken along line 4-4 in FIG. I and shows the cooperatingheating and scoring arrangement lying cooperatively opposite the arrangement of FIG. 3',
FIG. 5 is an enlarged fragmentary view taken along line 5-5 in FIG. 2, and shows the method by which the flanges of the container and lid are heat-sealed together and scored in one operation;
FIG. 6 is an enlarged fragmentary view taken along line 6-6 in FIG. 2, and shows the trimming and curling operation forforrning the container and lid into a compact package;
FIG. 7 is an isometric view of the combined container and lid when heat-sealed together;
FIG. 8 is a sectional view taken along line 8-8 in FIG. 7, and shows the relationship of the heat-sealed flanges with their offset scores;
FIG. 9 is a sectional view taken along line 9-9 in FIG. 7, and shows the relationship of tab portions on the lid flange and container flange heat-sealed together and forming a tear strip; and
FIG. 10 is a sectional view taken along line Ill-I0 in FIG. 7, and shows the relationship between the tab on the lid and the corresponding tab portion on the container, as well as the ofl set scores thereon.
DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION Referring to the drawing, a plurality of preformed containers 10 which have been formed from a thermoplastic sheet of material, are fed into a set of processing dies 12. The containers 10 project from a sheet or web of assembled units.
Thus, the containers 10 may be prefonned from a single sheet which may contain, for example, an aggregate of eight container units. The covers 11 for these containers are similarly preformed from a sheet Ila of thermoplastic material so that a corresponding number of covers are made available and super-imposed over the containers preparatory to sealing the covers onto the containers. Thus, the containers I0 are formed from the sheet 10a, whereas the covers are formed from the overlying thermoplastic sheet 11a.
The superimposed covers and containers are fed or transferred through a die set l2 wherein the operations of sealing and trimming the containers are carried out. The die set 12 includes two die stations, 12a and 12b, the first of these being die station wherein heat is applied to the assembly for sealing the lid to the container and scoring lines are impressed in the assembly by which the plastic lid or cover may be readily removed to subsequently gain access to the contents within the container. The feeding or transfer of the webbed containers and covers or lids through the die stations 12a and I2!) may be accomplished through conventional transfer and conveying means.
The die set 12 has a fixed upper plate 14 and a movable lower plate 16. The latter is guided in its motion with respect to the upper plate 14 through guide rods or shafts 18 which are fixed to the plate 14 and are inserted within bearings 19 of the lower movable die plate 16. These guide rods 18 guide the movable plate 16 so that it is maintained in proper alignment with respect to the upper plate 14. Accordingly, the bearings 19 are slidably movable along the guide rods or guide shafts 18.
When the container and associated lid are brought or transferred to the first die station 120, a heating, scoring and sealing operation is applied to the combined container and lid. The container has tapered sides terminating in a flanged rim 10b at its open end. The closed bottom of the container is integral with the sides of the container. in addition, a bead 10c surrounds the tapered sides of the container for purposes of reinforcement. The lid 11 of the container has a flanged rim 11b which extends over and lies directly above the flange 10b and in contact therewith.
The lid 11, moreover, has a tab f, as shown in FIG. 7, which facilitates the lifting of the lid from the container and replacing the lid to reclose the container when desired. When the container is sealed, a tear strip 11c, also shown in FIG. 7, surrounds the container along the lid. The tear strip 11c includes a portion of the lid and container which may be readily severed from the main body of the assembly through a score which has been applied during the sealing operation in which the lid is sealed onto the container. The tear strip 11c terminates in two tabs 11d and Me which lie on opposite sides of the tab 11f. The presence of these two tabs 11d and 11e on the tear strip facilitate the tearing of this strip from either side of the tab 11f.
Accordingly, if the container is opened by gripping the tab 11d between the thumb and the forefinger, for example, the strip will tear from the assembly in a clockwise direction, when viewed from the top of the lid. When on the other hand, the tab 112 is similarly gripped, the strip will tear from the assembly in a counterclockwise direction.
Whereas the score separates the strip 11c from the assembly, no such separating score is applied to the tab llf where it joins the flanged rim 11b of the lid. Such a score on the tab 11f is not desired since the tab is to be completely and permanently secured to and integral with the lid for removing the lid from the container after tearing the strip 110 from the assembly, and for subsequent replacement of the lid to reclose the container, if desired.
The details of the operation in which the lid is sealed to the container may be seen from the fragmentary enlarged view of HO. 5. After the container 10 and corresponding cover 11 have been located in place at the first die station 12a, the lower movable plate 16 is moved upward until the die sections 20 and 22 are brought together as shown in detail in FIG. 5. in this position of the die sections, the flange portions 10b of the container and 11b of the lid are directly pressed together. Extensions of these two flange portions are heat-sealed to each other by the die sealing portions 20a and 22b.
Heat to these sealing portions of the die sections is provided by heating coils 24 and 26 within the die sections 20 and 22, respectively. These heating coils are held within recesses of the die sections and surround the container and lid to be sealed thereto. The heating coil 24, for example, is retained within the groove or recess 28 through a retaining plate 30 secured to the upper die section 20 by a threaded screw device 32, for example. A similar structural arrangement applies to the heating coil 26. Through the presence of these heating coils in the lower and upper die sections 22 and 20, heat is continuously supplied to the sealing portions 20a and 22b of the die sections. The heating coils may contain conventional heating elements 34 which have terminals 36 to which electrical energy may be supplied in the customary manner.
In view of the thermoplastic characteristics of the material used for the container and lid, the extended portions of the flanges 10b and 11b between the sealing portions 20a and 22b,
become permanently sealed together through pressure applied by these heated sealing portions of the die sections. After an appropriate dwell period which assures that the lid and container flanges have been properly heat-sealed together, the movable die plate 16 is drawn downward. To assure that the container 10 does not remain adhering to the lower die section 22, an ejection plunger 38 is provided. The plunger 38 is acted upon by a spring 40 which tends to maintain the plunger 38 in an upward position, in which the container I0 is ejected from the interior of the die section 22. To enable the spring 40 to act upon the plunger 38 in this manner, a cup-shaped member 42 is mounted on the plate 16 so that one end of the spring 40 can abut the interior of this cup-shaped member. The other end of the spring 40 abuts directly the plunger 38. An ejection mechanism of this type is required since the tapered sides or walls of the container 10 will tend to adhere to the tapered portion 22c of the lower die section 22, which holds the container in place during the sealing operation. Thus, the tapered portion 22c of the die section serves to locate the container accurately during the processing operations. At the same time, however, such tapered surfaces have the inherent characteristic of clinging or adhering to each other at the interface. As a result, the tapered surface of the container wall tends to inherently cling to or stick to the tapered surface of the die section.
During the operation in which the extended portions of the flanges 10b and 11b are heat-sealed to each other, scores are also applied to these flanges through scoring knives 44 and 46. The upper and lower scoring knives are offset from each other so that scores 11g and 10d are applied to the lid and container, respectively, in an offset manner. These scores are applied for the purpose of facilitating the removal of the tear strip llc from the container assembly. The tear strip is composed of an extended portion of the lid flange 11b and the container flange 10b. This combined structure of the tear strip results from these two extended flange portions being heat-scaled together, as previously described. Accordingly, the composite tear strip may be removed as a unit by severing along the scores 10d and Hg. The knives 44 and 46 are held in contact with the die sections retaining the heating coils 24 and 26. The upper scoring knife 44 is held in place by a retaining ring 48 which presses the scoring knife firmly against the portions 200 of the die section so as to maintain the scoring knife properly located.
The scoring knife 44 and retaining ring 48 have ring-shaped or annular cross sections. The scoring knife 46 is held in place and pressed against the die portion 22b by the tapered die portion 22c which also serves the purpose of locating the container at the first die station. Since the die portions 200 and 22b are maintained at an elevated temperature by the heating coils 24 and 26, the scoring knives 44 and 46 are also heated as a result of being in contact with the die portions 200 and 22b. The heating of these scoring knives 44 and 46 facilitates the formation of the scores 10d and 11g when the die sections are brought together. The scores 10d and llg are offset relative to each other to increase the structural strength of the partitioning portion which partitions the tear strip 11c from the container and lid. Thus, if the two V-shaped scores were to lie directly aligned and opposite to each other, the tear strip could accidentally sever from the container assembly because of the small amount of material left between the vcrtices of the scores. By somewhat offsetting the two scores 10d and 11g with respect to each other, a substantially larger amount of material or thickness is left between the vertex of each score and the oppositely lying exterior surface. As a result of this added thickness of the material on the opposite side of the score, greater structural strength of the score is realized. At the same time, no substantially greater force is required to sever the tear strip from the container and lid combination. Thus, the tear strip may be nearly as readily removed with the offset scores as with the design in which the scores are aligned and directly facing each other.
The flange portion of the container beneath the tab 11f is scored because the score 10d is continuous and forms a closed path or closed score. The score 11g, however, is discontinuous in the respect that it does not extend over the tab llf. The discontinuity in this score is necessary to maintain the tab 11f firmly secured to and integralwith the lid proper. If the score Hg, for example, were to be continuous in a manner similar to that of the score d, the tab 11f couldreadily sever from its lid when pulled upward for the purpose of opening the container. If the tab were thus severed from the lid, it would then make removal of the lid somewhat difficult, for prying might be required at the interface of the lid and container to remove the lid in the absence of the tab. Accordingly, the score Hg is continuous with the exception of the-portion which extends across the tab 11f.
When the tear strip 110 is removed from the lid, the scored tab of the container beneath the lid tab 11f will tend to remain attached to the container rim because the score through this lower tab is not severed when the tear strip is removed. When the tab 11f is lifted, however, for the purpose of removing the lid from the container, the force applied to this tab by the gripping fingers, for example, will tend to be sufficient to sever the connection between the lower tab and the container rim. Since this lower tab is heat-sealed to the under side of the cover tab 11f, it will be removed with the lid and will thereafter be a portion of the lid, serving thereby to give the tab 11f a double thickness.
After the extended flange portions of the container and lid have been heat-sealed together and scored, the die sections are parted through the downward motion of the plate 16, and the combined container and lid are transferred from the first die station 12a to the second die station 12b. ln this second die station a curling operation is applied to the sealed flanges of the container and lid, after trimming or severing from the webs from which the container and lid were preformed. The trimming and curling operation is shown in detail in FIG. 6. For the purpose of performing the trimming operation, the upper die section 50 at the second die station has a trimming or cutoff portion 50a. When the lower die portion 52 is brought upward to mate with the upper die section 50, the trimming or cutoff portion 500 will sever the portion 11h from the tear strip llc. This trimming or cutoff operation may also serve to sever the sealed lid and container from the respective webs 10a and 11a. As the die section 52 proceeds in its upward stroke or movement, the remaining portion of the sealed flanges are curled over the die portion 52a, as a result of the relative action between the trimming and curling die portion 50a and the curling portion 52a. Thus, during the upward stroke of the die section 52 the sealed flange portions are forced to curl over the die portion 52a, and thereby result in a curled-over portion of the tear strip which is substantially parallel to the axis of the container perpendicular to the bottom plane thereof. When the container stands on a horizontal surface afler being thus sealed, the edge of the tear strip faces directly the horizontal surface upon which the container stands.
When the die sections of the second station are separated by the downward stroke or motion of the plate 16, at the end of the curling operation, the sealed container is prevented from moving downward with the die section 52 due to the presence of the fixed ejector 54. The latter is secured to the fixed guide rod 18 through a clamping bracket 56. This clarn'ping bracket 56 secures the ejector 54 to the guide rod 18. Thus, when brought to the second die station 1212, the container will rest upon the ejector 54, or be in close proximity with the upper surface of this ejector. When the die section 52 is moved upward, the container remains essentially unaffected in its position because the ejector is fixed in its location. When. subsequently, the die section 52 is moved downward at the end of the curling operation, the container is prevented from adhering or sticking to the lower die section 52, through the presence of the stationary ejector 54. The die portion 50b, which cooperates with the cutoff portion 500 to trim or sever the portion llh from the sealed flanges of container and lid, is
under spring pressure when the die section 5t and 52 are in closed position. Thus, the spring 58 abutting the fixed plate 14 and the die portion 50a=applies a downwardly directed force to the portion 50a. When the two die sections 50 and 52 are brought together, the severed portion llh is firmly squeezed between the upper cutofi' portion 50b and the lower cutoff portion 52b. The spring force acting on the portion 50!; due to the spring 58 assures neat and sharp severance of the tear strip ilc from the severed portion 11h. Firm gripping of the cutoff section 11h by the die portions 50b and 52b is necessary to obtain a clean severance of portion. llh and avoid a ragged cut edge of the finished container assembly.
it is thought that the invention and many of its attending advantages will be understood from the foregoing description and it will be apparent that changes may be made in the steps of the method described and their order of accomplishment without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hercinbefore described being merely a preferred embodiment thereof.
We claim:
l. A thennoplastic container package comprising, in combination:
an open-ended container having a closed base and sides integral with said base;
a container flange portion adjoining the rim of the open end of said container and severable from said rim along a score surrounding the open end of said container;
a lid for closing the open end of said container;
a lid tab portion extending from the rim of said lid and integral with said lid, said lid tab portion being sealed to said container flange portion adjacent and below said score surrounding the open end of said container, said lid tab portion being for removing said lid from said container by severing said score surrounding the open end of said container and for replacing said lid onto said container; and
a lid flange portion adjoining the rim of said lid and said lid tab portion, said lid flange portion being sealed to said container flange portion and severable from the rim of said lid and said tab along a score in said lid flange portion, said score surrounding the open end of said container being offset from said score on said lid flange portion.
2. The thermoplastic container package as defined in claim 1 including a lid flange; tab portion integral with said lid flange portion and adjoining one side of said lid tab portion, said lid flange tab portion being severable with said lid flange portion along said score.
3. The thermoplastic container package as defined in claim 2 including a further lid flange tab portion integral with said lid flange portion and adjoining the other side of said lid tab portion, said further lid flange tab'portion being severable with said lid flange portion along said score.
4. The thermoplastic container package as defined in claim ll wherein said sides of said container are tapered.
5. The thermoplastic container package as defined in claim 1 wherein said lid has a recess within said rim of said lid.

Claims (5)

1. A thermoplastic container package comprising, in combination: an open-ended container having a closed base and sides integral with said base; a container flange portion adjoining the rim of the open end of said container and severable from saiD rim along a score surrounding the open end of said container; a lid for closing the open end of said container; a lid tab portion extending from the rim of said lid and integral with said lid, said lid tab portion being sealed to said container flange portion adjacent and below said score surrounding the open end of said container, said lid tab portion being for removing said lid from said container by severing said score surrounding the open end of said container and for replacing said lid onto said container; and a lid flange portion adjoining the rim of said lid and said lid tab portion, said lid flange portion being sealed to said container flange portion and severable from the rim of said lid and said tab along a score in said lid flange portion, said score surrounding the open end of said container being offset from said score on said lid flange portion.
2. The thermoplastic container package as defined in claim 1 including a lid flange tab portion integral with said lid flange portion and adjoining one side of said lid tab portion, said lid flange tab portion being severable with said lid flange portion along said score.
3. The thermoplastic container package as defined in claim 2 including a further lid flange tab portion integral with said lid flange portion and adjoining the other side of said lid tab portion, said further lid flange tab portion being severable with said lid flange portion along said score.
4. The thermoplastic container package as defined in claim 1 wherein said sides of said container are tapered.
5. The thermoplastic container package as defined in claim 1 wherein said lid has a recess within said rim of said lid.
US815416A 1969-04-11 1969-04-11 Scored peripheral tear strip with reclosure lid Expired - Lifetime US3572579A (en)

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US20080035641A1 (en) * 2006-08-14 2008-02-14 Steve Foldesi Dual tab lid
US20080277397A1 (en) * 2005-12-21 2008-11-13 Terry Vovan Integrated food packaging system
US20090120937A1 (en) * 2007-11-10 2009-05-14 Terry Vovan Double ribbed secure container
US20090206082A1 (en) * 2008-02-14 2009-08-20 Pwp Industries Tamper-evident packaging system
US20090223619A1 (en) * 2005-06-24 2009-09-10 Terry Vovan Edge-tearing tamper-evident container
US20100065567A1 (en) * 2005-06-10 2010-03-18 Pwp Industries Tamper-evident container with extended band
US20100200588A1 (en) * 2006-03-14 2010-08-12 The Glad Products Company Vacuum storage container
USD637489S1 (en) 2010-12-10 2011-05-10 Pactiv Corporation Pull grip feature of a container lid
USD638704S1 (en) 2010-12-10 2011-05-31 Pactiv Corporation Container lid
US8083089B2 (en) 2005-07-13 2011-12-27 Pwp Industries Inc. Versatile tamper-evident food container
US8146766B2 (en) 2009-04-29 2012-04-03 Pwp Industries Enhanced secure container
US8251249B1 (en) 2005-06-24 2012-08-28 Pwp Industries Hangable tamper resistant packaging system
US20160096663A1 (en) * 2014-09-30 2016-04-07 Ali Lotfi Novel tamper evident containers
IT201600115892A1 (en) * 2016-11-16 2018-05-16 Gea Procomac Spa DEVICE FOR APPLICATION OF A CLOSURE ON A POCKET OF A CONTAINER
US10220985B2 (en) 2016-10-28 2019-03-05 Genpak, Llc Tamper-evident container with a tabbed hinge
US10351310B2 (en) 2016-10-28 2019-07-16 Genpak, Llc Tamper-evident container with a bump near a tabbed hinge
US10889413B2 (en) 2016-10-28 2021-01-12 Genpak, Llc Tamper-evident container with a tab extending beyond a hinge
US10894635B2 (en) 2016-10-28 2021-01-19 Genpak, Llc Tamper-evident container with a wide tab extending beyond a hinge

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US3753512A (en) * 1970-10-27 1973-08-21 Phoenix Closures Inc Container and closure
US3672528A (en) * 1970-12-18 1972-06-27 George W Faulstich Neck for wide-mouth jar and cap therefor
US3773207A (en) * 1971-11-30 1973-11-20 American Can Co Easy-open thermoplastic container package
US3955742A (en) * 1975-02-24 1976-05-11 Marshall Paul W Container lid with integral removable eating utensil
US4027775A (en) * 1975-05-28 1977-06-07 National Packaging Associates Corporation Tamper-indicating container and lid therefor
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US4286712A (en) * 1978-10-11 1981-09-01 Focke & Co. Multi-layered foil cigarette pack including method and apparatus for producing a tear line in the foil
US4759463A (en) * 1981-11-06 1988-07-26 Plastigord "Plastiques Du Perigord" Air-tight box forming a container for various products
FR2527175A1 (en) * 1982-05-21 1983-11-25 Raffinage Cie Francaise NEW CAPSULE FOR HERMETIC CLOSURE OF CONTAINERS
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EP0241016A2 (en) * 1986-04-08 1987-10-14 Idemitsu Petrochemical Co. Ltd. Easily-openable packaging container
US4905838A (en) * 1986-04-08 1990-03-06 Idemitsu Petrochemical Co., Ltd. Easily-openable packaging container having notched inner surface layer
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US4877391A (en) * 1986-08-11 1989-10-31 Wmf Container Corporation Apparatus for scoring rigid plastic sheet material
US4747510A (en) * 1987-07-06 1988-05-31 Fort Howard Cup Corporation Tear open lid
US4836407A (en) * 1987-08-04 1989-06-06 Cpc-Rexcel, Inc. Tamper-evident, differential pressure-thermoformed lidded plastic container
US4893452A (en) * 1987-08-04 1990-01-16 Cpc-Rexel, Inc. Method for making a tamper-evident, differential pressure-thermoformed lidded plastic container
US4834245A (en) * 1988-08-05 1989-05-30 Kabushiki Kaisha Hosokawa Yoko Pouch having tearing zone for taking out content packed therein
US5058760A (en) * 1989-01-19 1991-10-22 Firma Schmalbach-Lubeca Ag Easy-open package and method of making same
US5002223A (en) * 1989-01-19 1991-03-26 Firma Schmalbach-Lubeca Ag Easy-open package with outwardly projecting open tab
US5226586A (en) * 1990-04-26 1993-07-13 Lin Tec Verpackungstechnik Gmbh Container, especially drinking cup
US5069355A (en) * 1991-01-23 1991-12-03 Sonoco Products Company Easy-opening composite closure for hermetic sealing of a packaging container by double seaming
US5253772A (en) * 1991-05-21 1993-10-19 Sweetheart Cup Company, Inc. Tamper evident container assembly
US5490827A (en) * 1991-05-21 1996-02-13 Sweetheart Cup Company, Inc. Tamper evident container and related apparatus
US5653382A (en) * 1991-05-21 1997-08-05 Sweetheart Cup Company, Inc. Tamper evident container and related apparatus
US5658228A (en) * 1992-04-30 1997-08-19 Sweetheart Cup Company, Inc. Tamper evident container and related apparatus
US5353943A (en) * 1993-03-15 1994-10-11 Sonoco Products Company Easy-opening composite closure for hermetic sealing of a packaging container by double seaming
DE4410206A1 (en) * 1994-03-24 1995-09-28 Tetra Laval Holdings & Finance Elastic pack with partially detachable gripping tab
GB2322289A (en) * 1995-10-27 1998-08-26 Amhil Ets Ltd Foldback cup lid
GB2322289B (en) * 1995-10-27 1999-08-18 Amhil Enterprises Foldback cup lid having comfortable drinking characteristics
WO2001000067A1 (en) * 1999-06-28 2001-01-04 Design Safety Corporation Closure indicator for cup lid
US6474490B1 (en) * 2000-11-10 2002-11-05 Label Makers, Inc. Combined container cap and lift tab opener
US7631776B2 (en) * 2005-06-10 2009-12-15 Pwp Industries Tamper evident container with tear-apart parts
US20060278652A1 (en) * 2005-06-10 2006-12-14 Terry Vovan Tamper evident container with tear-apart parts
US8251242B2 (en) 2005-06-10 2012-08-28 Pwp Industries Tamper-evident container with extended band
US20100065567A1 (en) * 2005-06-10 2010-03-18 Pwp Industries Tamper-evident container with extended band
US8251249B1 (en) 2005-06-24 2012-08-28 Pwp Industries Hangable tamper resistant packaging system
US7992743B2 (en) 2005-06-24 2011-08-09 Pwp Industries Edge-tearing tamper-evident container
US20090223619A1 (en) * 2005-06-24 2009-09-10 Terry Vovan Edge-tearing tamper-evident container
US8851315B2 (en) 2005-07-13 2014-10-07 Pactiv Packaging Inc. Versatile tamper-evident food container
US8083089B2 (en) 2005-07-13 2011-12-27 Pwp Industries Inc. Versatile tamper-evident food container
US20080000904A1 (en) * 2005-12-21 2008-01-03 Terry Vovan Tamper evident container
US20080006632A1 (en) * 2005-12-21 2008-01-10 Terry Vovan Advanced tamper evident bowl
US20070138180A1 (en) * 2005-12-21 2007-06-21 Terry Vovan Enhanced tamper evident bowl with blocked tab
US8833589B2 (en) 2005-12-21 2014-09-16 Pactiv Packaging Inc. Enhanced tamper evident bowl with blocked tab
US8360262B2 (en) 2005-12-21 2013-01-29 Pactiv Packaging Inc. Integrated food packaging system having a cup, a container, and a cover
US8056750B2 (en) 2005-12-21 2011-11-15 Pwp Industries Advanced tamper evident bowl
US20080277397A1 (en) * 2005-12-21 2008-11-13 Terry Vovan Integrated food packaging system
US8123064B2 (en) 2005-12-21 2012-02-28 Pwp Industries, Inc. Tamper evident container having a pull-open section
US20100200588A1 (en) * 2006-03-14 2010-08-12 The Glad Products Company Vacuum storage container
US20100108680A1 (en) * 2006-06-05 2010-05-06 Terry Vovan Enhanced tamper evident container with tear-apart parts
US8028851B2 (en) 2006-06-05 2011-10-04 Pwp Industries Enhanced tamper evident container with tear-apart parts
US20080035641A1 (en) * 2006-08-14 2008-02-14 Steve Foldesi Dual tab lid
US8720727B2 (en) * 2006-08-14 2014-05-13 Nestech Machine Systems, Inc. Dual tab lid
US8127961B2 (en) 2007-11-10 2012-03-06 Pwp Industries Double ribbed secure container
US20090120937A1 (en) * 2007-11-10 2009-05-14 Terry Vovan Double ribbed secure container
US20090206082A1 (en) * 2008-02-14 2009-08-20 Pwp Industries Tamper-evident packaging system
US8146766B2 (en) 2009-04-29 2012-04-03 Pwp Industries Enhanced secure container
USD637489S1 (en) 2010-12-10 2011-05-10 Pactiv Corporation Pull grip feature of a container lid
USD638704S1 (en) 2010-12-10 2011-05-31 Pactiv Corporation Container lid
US20160096663A1 (en) * 2014-09-30 2016-04-07 Ali Lotfi Novel tamper evident containers
US10870519B2 (en) * 2014-09-30 2020-12-22 Lacerta Group, Inc Tamper evident containers
US10220985B2 (en) 2016-10-28 2019-03-05 Genpak, Llc Tamper-evident container with a tabbed hinge
US10351310B2 (en) 2016-10-28 2019-07-16 Genpak, Llc Tamper-evident container with a bump near a tabbed hinge
US10889413B2 (en) 2016-10-28 2021-01-12 Genpak, Llc Tamper-evident container with a tab extending beyond a hinge
US10894635B2 (en) 2016-10-28 2021-01-19 Genpak, Llc Tamper-evident container with a wide tab extending beyond a hinge
IT201600115892A1 (en) * 2016-11-16 2018-05-16 Gea Procomac Spa DEVICE FOR APPLICATION OF A CLOSURE ON A POCKET OF A CONTAINER
EP3323772A1 (en) * 2016-11-16 2018-05-23 Gea Procomac S.p.A. Device for applying a closure on a mouth of a container

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