US3473589A - Plastic bag - Google Patents

Plastic bag Download PDF

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Publication number
US3473589A
US3473589A US607346A US3473589DA US3473589A US 3473589 A US3473589 A US 3473589A US 607346 A US607346 A US 607346A US 3473589D A US3473589D A US 3473589DA US 3473589 A US3473589 A US 3473589A
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United States
Prior art keywords
fastener
layer
inner layer
elements
wall
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
US607346A
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English (en)
Inventor
Walter O Gotz
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.)
Minigrip Inc
Original Assignee
Minigrip Inc
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Filing date
Publication date
Application filed by Minigrip Inc filed Critical Minigrip Inc
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Publication of US3473589A publication Critical patent/US3473589A/en
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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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B65D33/2516—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor comprising tamper-indicating means, e.g. located within the fastener
    • B65D33/2533—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor comprising tamper-indicating means, e.g. located within the fastener the slide fastener being located between the product compartment and the tamper indicating 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices

Definitions

  • the invention relates to a material having flexible pressure interlocking releasable fasteners or interlocking elements extending therealong for forming bags or similar articles for containing items such as perishable goods.
  • the interlocking portions of the element must be related to each other and to the backing material in such a way that they can readily be closed by applying pressure to the outer surfaces of the material and can readily be opened by pulling the elements apart such as by separating connected opening flanges.
  • the fastener structure must be such that a container, and particularly the supporting walls for the fastener elements can take loads such as are encountered when the bags are stacked or can take rolling and twisting such as occurs with handling without inadvertently opening.
  • the fastener structure must be so related to the supporting wall that it can be intentionally drawn open when desired without tearing the parts and without making them incapable of reuse.
  • an object of the invention is to provide an improved fastener and supporting material therefor that lends a superior support relationship between the interlocking element and the supporting wall of material which has improved faculties for opening the fastener, keeping the fastener closed, and permitting reopening and reclosing.
  • a feature of the invention is the provision of an interlocking element which is made of one piece with an inner layer of a wall of material and wherein an outer layer is laid over the inner layer and laminated thereto so that support is afforded for the fastener element directly by the inner layer and reinforcing by the outer layer and a carrying platform or support is provided for the inner layer by the outer layer so as to afford an overall coaction between the fastener and the two layers and the line of lamination therebetween.
  • FIGURE 1 is a sectional view taken through a layer of material constructed in accordance with the principles of the present invention
  • FIGURE 2 is a sectional view taken through the top of a container formed of the material of FIGURE 1;
  • FIGURE 3 is a sectional view through another form of construction of the invention.
  • a first thin inner layer 10 of flexible plastic material having a first fastener element 12 extending therealong.
  • the fastener elements 12 and 14 are complementary shaped for pressure interlocking and for being released when drawn apart. They are shown with the interlocking element 12 being a female element having projecting sides and the element 14 being a male element to be gripped by the element 12 when in the interlocked position as illustrated in FIGURE 2.
  • the interlocking elements may take various forms and the element 14 may be arrowhead shaped with the element 12 having overhanging sides to grip behind the head of the arrow.
  • the lips or sides of the element 12 be sufficently flexible to bend when the element 14 is pressed into the groove formed between the sides and the immediate base of the elements is preferably of the same material as the elements, yet the overall support for the elements must not tear or permanently stretch when the elements are separated such as when a bag is intentionally opened.
  • the support for the fastener elements therefore constitutes an important part of the function of the elements making them capable of remaining interlocked during normal usage in handling, permitting them to be rigidly interlocked when pressed together, and permitting them to be opened when' necessary.
  • the inner layer 10 may be a flexible plastic material such as polyethylene and the outer layer forms another layer of material which affords mounting or a carrying support for the inner layer 10 providing a superior functional relationship particularly at the location where the fastener elements 12 and 14 are carried.
  • the outer layer 16 may be formed of a material such as polypropylene or may be formed of a metallic foil.
  • the outer layer combined with the inner layer forms a composite wall which is substantially impervious to the penetration of moisture.
  • small minute holes often occur which extend through the material. By laminating the second layer to the first, these holes will be closed and a superior wall material will be provided.
  • the flanges of the elements if made long or thin will tend to tear if the elements provide too strong a lock.
  • the outer layer 16 provides extra strength to the inner layer location of the flanges so that a strong lock can be used for the fastener element 12 and a superior strength and a tighter fastener is achieved than if a single layer were used.
  • the outer material can be a stronger material (better suited for strength or support than the inner layer) such as where the inner layer is polyethylene and the outer layer is polypropylene. This makes it unnecessary to use an unnecessarily thick material to obtain the necessary strength.
  • FIGURE 1 may be considered as presenting a single sheet or wall or as plural walls. If separate sheets 30 and 32 are used to make a bag or container, these sheets are welded or seamed together at their base and edges. If desired, the wall or sheet shown can be made as a single unit such as by being extruded from a die in one pass or the single sheet can be extruded in tubular form with the tube being slit along its length to form the sheet.
  • the sheet or wall 32 has an upper flange portion 24a on one side with a body portion on the other side.
  • the wall 30 has a flange portion 22a on one side of the fastener element 14 and the body portion on the other side.
  • the flange portions 22a and 24a have lines of weakened tear resistance 26 and 28 respectively. This is illustrated in FIGURE 2 with the areas 22 and 24 above the tear lines 26 and 28 being joined together to form a removable tear strip.
  • the outer layers 18 and 20 can be arranged to extend only to the tear strip thus accommodating more easily separation of the tear strip and actually providing a stronger backing for the material below the tear strip to facilitate better tearing.
  • the completed bag as it appears after the tear srip (formed of the areas 22 and 24) is removed has the outer layers 18 and 20 extending to its top edge with the upper edges of the outer layers shown at 18 and 20 to provide the grippable flanges to separate the fastener elements 12 and 14.
  • the tear line of weakened resistance has been omitted and the edges at 34 are thinned so that the entire edges can be removed.
  • the upper edges as formed by the areas 22 and 24, or formed by the portions 34 can be joined by being passed through a heated Pressing means, or, if desired, if the entire unit is extruded longitudinally as a tube they can be formed in one piece initially.
  • the outer layer 16 is then POSI- tioned over the outer surface of the inner layer 10. It IS then laminated to the inner layer by known methods such as by including a thin layer of cement or thermoplastic adhesive between the layers. Or, if desired, the outer layer can be positioned and heat applied in a relative manner so as to merely join the two layers to accomplish the lamination.
  • This support is backed by the line of juncture or lamination between the inner layer 10 and 16, and the outer layer provide a support of strength and protection for the inner layer at the place where it supports the fastener elements 12 and 14.
  • the fastener elements can be integral or of one piece with the bag wall, can be made of material of good elastic properties as is necessary for the elements, and can be very strong with the bag wall havingadequate strength without excessive thickness.
  • the forcefi/hich occur at the fastener elements as they are separated tend to be transmitted or absorbed by the laminated material and particularly the strong outer layer. Also as stresses occur and tend to stretch the inner layer of material, they will not create a breach or tear in the outer surface of the material. This makes possible a substantially stronger fastener structure than has heretofore been available.
  • the material provides a light weight strong structure. If a single layer of material were used, of suflicient weight to stand the stresses of a strong fastener the wall and the integral fastener elements can be formed in a single extrusion process but this creates uneven cooling and stresses in the inner layer. However, with the structure of the present invention the outer layer is not affected by unequal cooling and uneven stresses are not introduced due to stretching, during extruding, providing a material which has a strength superior to other material of the same thickness which has been formed in a single layer.
  • a first thin inner layer of flexible plastic material having a uniform first fastener element extending therealong formed of a resilient material and being of one piece with said layer
  • a second thin inner layer of flexible plastic material facing said first layer and having a uniform second fastener element extending therealong formed of a resilient material and being of one piece with said second layer and shaped to be releasably interlocked with the first fastener element,
  • said first inner and outer layers providing a first substantially monolithic wall so that said first inner layer provides a support for the first fastener element and the first outer layer provides a backing for the support with said layers coacting and allowing a stronger lock with a thin film
  • said second inner and outer layers providing a second substantially monolithic wall so that said second inner layer provides a support for the second fastener element and the second outer layer provides a backing for the support allowing a stronger lock with a thin film, said outer layers laminated to the inner layer opposite fastener elements so as to reinforce the inner layers in the area of said fastener elements.
  • first and second Walls being joined to each other below the fastener elements to form a container and extending above said first and second elements providing separating flanges which may be drawn away from each other for detaching said first and second elements and separating the walls to open the container.
  • a thin inner layer of flexible plastic material having a uniform straight fastener element extending therealong formed of a resilient material and being of one piece with the layer
  • said layers providing a substantially monolithic wall for combining with another Wall to form a container with said other wall having another fastener element shaped to releasably interlock with the first fastener element,
  • said outer layer laminated to the inner layer directly opposite said fastener element so as to reinforce the inner layer at the area of the fastener element.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Bag Frames (AREA)
  • Laminated Bodies (AREA)
US607346A 1965-12-11 1966-12-09 Plastic bag Expired - Lifetime US3473589A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEE0030648 1965-12-11

Publications (1)

Publication Number Publication Date
US3473589A true US3473589A (en) 1969-10-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US607346A Expired - Lifetime US3473589A (en) 1965-12-11 1966-12-09 Plastic bag

Country Status (12)

Country Link
US (1) US3473589A (da)
AT (1) AT268986B (da)
BE (1) BE690947A (da)
CH (1) CH452430A (da)
DK (1) DK120521B (da)
FI (1) FI51678C (da)
FR (1) FR1504276A (da)
GB (1) GB1125189A (da)
LU (1) LU52559A1 (da)
NL (1) NL6617372A (da)
NO (1) NO130107B (da)
SE (1) SE314576B (da)

Cited By (103)

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US3613524A (en) * 1970-02-24 1971-10-19 Dow Chemical Co Method and apparatus for manufacturing bag stock
US3619395A (en) * 1969-04-17 1971-11-09 Minigrip Inc Method of making a pilfer proof package
US3625270A (en) * 1970-04-17 1971-12-07 Milorad Skendzic Pilferproof package
US3685562A (en) * 1971-03-03 1972-08-22 Steven Ausnit Flexible pilfer proof closure construction for bags
US3780781A (en) * 1971-09-07 1973-12-25 Seisan Nipponsha Kk Openable bag
US3796245A (en) * 1973-11-21 1974-03-12 O Wildensteiner Drip meters
US3815317A (en) * 1973-03-08 1974-06-11 F Toss Method and mechanism for making filled bags
US3824908A (en) * 1972-11-01 1974-07-23 F Rowell Apparatus for producing packaging articles
US3827472A (en) * 1969-12-05 1974-08-06 Seisan Nipponsha Kk Reclosable bag
DE2603085A1 (de) * 1975-01-30 1976-08-05 Colgate Palmolive Co Behaelter fuer feuchte tuecher
FR2396694A1 (fr) * 1977-07-07 1979-02-02 Minigrip Europe Gmbh Sac refermable et procede et dispositif pour la fabrication de celui-ci
US4246288A (en) * 1979-08-09 1981-01-20 W. R. Grace & Co. Reclosable package
US4355494A (en) * 1979-08-06 1982-10-26 Minigrip, Inc. Reclosable bags, apparatus and method
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US4615045A (en) * 1983-11-02 1986-09-30 Minigrip, Inc. Pilfer proof hangup bag structure and method
US4637060A (en) * 1983-08-05 1987-01-13 Minigrip Zipper-lock bag chain adapter for automatic loading and heat seal closing
US4720015A (en) * 1986-04-30 1988-01-19 International Paper Company Moisture-proof, linerless carton with reclosable top membrane
US4759642A (en) * 1986-08-11 1988-07-26 Minigrip, Inc. Reclosable bag especially suitable for cereal packaging, and method
US4786190A (en) * 1986-08-11 1988-11-22 Minigrip, Inc. Reclosable package having outer reclosable closure and inner non-reclosable closure
EP0302144A2 (en) 1987-08-06 1989-02-08 Minigrip Europe Gmbh Reclosable bag having an outer reclosable zipper type closure and inner non-reclosable closure
US4832505A (en) * 1988-03-11 1989-05-23 Minigrip, Inc. Tamper evident link bags
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Also Published As

Publication number Publication date
BE690947A (da) 1967-05-16
CH452430A (fr) 1968-05-31
NL6617372A (da) 1967-06-12
NO130107B (da) 1974-07-08
GB1125189A (en) 1968-08-28
DK120521B (da) 1971-06-07
FI51678B (da) 1976-11-30
LU52559A1 (da) 1967-02-09
SE314576B (da) 1969-09-08
FI51678C (fi) 1977-03-10
FR1504276A (fr) 1967-12-01
AT268986B (de) 1969-02-25

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