US3779139A - Method of forming plastic bag with integral tie - Google Patents

Method of forming plastic bag with integral tie Download PDF

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Publication number
US3779139A
US3779139A US00226710A US3779139DA US3779139A US 3779139 A US3779139 A US 3779139A US 00226710 A US00226710 A US 00226710A US 3779139D A US3779139D A US 3779139DA US 3779139 A US3779139 A US 3779139A
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United States
Prior art keywords
bag
tear strip
sealing
ply
web
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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
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US00226710A
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English (en)
Inventor
D White
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FMC Corp
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FMC Corp
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    • 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
    • B65D33/1616—Elements constricting the neck of the bag
    • B65D33/165—Flexible elongated elements integral with or attached to bags or sacks ; Fastening thereof to the bag before closing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents

Definitions

  • ABSTRACT A plastic film web is perforated and sealed at the open end of a bag to provide an integrall tear strip portion of the bag material which can later be either wholly or partially detached for use as a closure tie.
  • a separable tear strip formed of the bag material is later readily freed for use as a closure tie.
  • the tear strip tie can be made either entirely or partially separable, and can be either single ply, multi-ply, or a reinforced form of either.
  • FIG. 1 is a schematic side elevation of a bag making machine adapted to carry out the bag forming method and to produce the bag article of the present invention.
  • FIG. 2 is an enlarged schematic elevation including a sealing and perforating mechanism at the inlet end of the bag machine shown in FIG. 1.
  • FIG. 3 is an enlarged schematic elevation of a selectively operable perforating mechanismshown in FIG. 1.
  • FIG. 4 is a schematic perspective of the FIG. 2 perforating mechanism.
  • FIG. 5 is a schematic perspective of a web sealing and severing station of the bag machine.
  • FIG. 6 is a schematic isometric of one embodiment of a completed bag.
  • FIG. 7 is a schematic perspective of the FIG. 6 bag after filling and tying.
  • FIGS. 8-15 are schematic perspectives of further embodiments of the present invention.
  • FIG. 1 illustrates a known type of bag making machine 20, which. in the present case is arranged to heat seal and sever a prefolded film web W supplied from a roll R.
  • the web W is supplied longitudinally folded so that one edge is slightly spaced from the other edge, in the form known, due to this type of fold, as J-stock.
  • two adjacent sealing and severing operations produce one bag known as a side-weld bag because the sealed and severed portions extend along the side margins of the completed bag.
  • the web feed downstream of the perforating station 28 is intermittent, the web is trained through a conventional dancer roll assembly 30 which operates to automatically accumulate and pay out the web according to the web requirements downstream of the dancer roll assembly.
  • the next station is a selectively operable intermittent perforating station 32 which is used only when the perforating mechanism of the sealing and perforating station 28 is inactive.
  • the intermittent perforating station 32 produces in terrupted bag perforations, whereas the station 28 produces continuous perforations.
  • continuous perforations provide a removable tear strip, while the interrupted perforations retain the tear strip attached to the body of the bag.
  • selected portions of the tear strip can be consolidated by a spot-sealing operation at a sealing station 34, following which the web passes through the intermittent feed rolls at 36, and a sealing and severing station at 38 where the side margins of the bag are simultaneously sealed and severed from the web.
  • a conveying section at 40 then transfers the finished bags onto a stacking table 42 where they are assembled into stacks and are subsequently removed for packaging or other handling.
  • stations of the bag machine 20 which differ from a conventional bag machine are stations 24, 28, 32 and 34, as will presently be described. 1
  • the prefolded web W adjacent the draw rolls 122 includes a lower panel 44 and a narrower upper panel 46.
  • the exposed edge 48 of the lower panel 46 is guided through a stationary folding shoe 50 (FIG. 2) which functions to fold back a narrow hem or skirt 52 which ultimately becomes one edge of the open end of a bag B, as clearly shown in FIG. 6.
  • the folding shoe 50 is actually the hemming attachment of a conventional household sewing machine, and functions in the usual manner, whereby according to the width of the margin of material run through the attachment, either a single fold of U-shape section will be formed, or a double fold having the edge of the material disposed within the confines of a U-shaped fold.
  • the sltirt 52 on the folded edge of the web passes around the anvil roll 26 and under a cooperating perforating wheel 54 to form a linear series of spaced perforations at 56 between the previously identified edge 48 of the web panel 46, and an edge 58 of the web panel 44, and through both the skirt 52 and the web panel 46.
  • an electrically energized sealing bar 60 continuously heat-seals the skirt 52 to the web panel 46.
  • An air cylinder 62 carries the sealing bar 60 so that the sealing bar can be removed from the web when the machine is idle, or when a later described optional procedure is used and no longitudinal sealing operation is required.
  • the skirt 52 now forms a removable tear strip TS when the web is later transversely sealed and severed.
  • the only remaining operation is the sealing and severing of the web W (FIG. by a conventional heated sealing bar 64 which is actuated each time the feed rolls 36 (FIG. 1) have advanced one bag length of web, and the web is static. None of the described folding, sealing and perforating operations interrupt progress of the web, because each is a continuous operation. For this reason, the production rates of the bag machine are substantially as high as have formerly been attained.
  • the tear strip TS is an integral part of the bag having the same handling characteristics as the body of the bag, and the bags B can therefore be handled in stacking and packing operations with the same procedures presently in use. In contrast to present bags, however, the bag B now has a readily separable closure the tear strip TS which cannot be accidentally dislodged, lost or misplaced, and which is ready for immediate use when needed.
  • FIGS. 8-15 disclose some of the numerous possible other embodiments of the bag and bag forming method of the present invention, the structural means for effecting the same being the same elements already described, plus a spot-sealer 66 (FIG. 1) at the sealing station 34, and a skip-perforator 68 (FIG. 3), at the perforating station 32, which is used in lieu of the mechanism at the perforating station 28.
  • a spot-sealer 66 FIG. 1
  • a skip-perforator 68 FIG. 3
  • FIG. 8 illustrates a bag B1 which is similar to the bag B but has a single ply, only, in its tear strip TS, thus being formed wihtout use of the folding shoe 50, and being a suitable construction for a light duty bag, or for a bag of one of the stronger film materials.
  • the side margins of the bag are shown open in order to clearly illustrate the plies, and that in actuality these margins are sealed together by a sealing bar 64 at station 38 as each bag is severed from the upstream web portion.
  • FIG. 9 depicts a bag construction for a bag B2 in which the tear strip TS comprises a once folded web portion, as in the bag B, but wherein the arcuate sealing bar 60 (FIG. 4) is retracted by the air cylinder 62 to eliminate the longitudinal seal through the tear strip.
  • the spot-sealer 66 produces two spaced area seals, indicated by shaded areas at 70, which secure the two plies together at the ends of the tear strip and thus preserve the dual ply construction. Since the actual length of a tear strip in a trash can liner might be two feet or more, it is apparent that the central portion of the tear strip can easily be opened flat, if desired, so as to provide a wide wrap around the throat of the ba g. bag.
  • the FIG. 10 bag B3 is comparable to the bag B, with an additional folding step which may be accomplished by repositioning the folding shoe 50.
  • the width of material run through the folding shoe determines the type of fold.
  • a 1% inch fold is made, plus a V4 inch return fold.
  • This produces three plies through part of the folded margin.
  • a different folding shoe to produce a similar but four ply fold in the form of a flattened helix.
  • the arcuate sealing shoe 60 is used to interconnect all plies with a longitudinal seal through the tear strip TS, and the thus produced tear strip provides a stronger than usual tie for the bag.
  • Bags B4-B6 (FIGS. l113) all have single ply tear strips TS, and are formed by inactivating or removing the folding shoe 50 (FIG. 4), the perforating wheel 54, the sealing shoe 60, and the spot sealer 66 (FIG. 1), and by use of the skip-perforator 68 (FIGS. 1-3).
  • the skip-perforator includes rollers 72, 74 for guiding the web W around an anvil roll 76.
  • a perforator wheel 78 is carried by a pivot arm 80 for selective engagement with the web by means of a power cylinder 82.
  • Automatic, programmed operation of the perforator wheel for producing a preselected pattern of perforations may be effected in different ways, a preferred way (not shown) being a camoperated valve timed to the operation of the bag machine 20 for energizing and deenergizing the power cylinder 82.
  • a common feature of the bags 84-36 is that the perforations 56 of the tear strip TS in each case is interrupted so that the tear strip has a major portion separable from the bag, but remains connected to the bag at one or more points.
  • the tear strip retains its closure utility, as intended, but cannot slip off the bag when it is wrapped and tied around the throat of the bag.
  • the bag B4 is provided with a tear strip TS having opposed free end portions v84 centrally interrupted and thereby connected to the bag panel 46.
  • the bag B5 has an attached tear strip TS with only one free end 86, whereas the tear strip of the bag B6 (FIG. 13) has no free ends.
  • the bag B7 (FIG. 14) is provided with a two ply tear strip TS which has no free ends and is produced by use of the folding shoe 50 (FIG. 4) to form the double ply, and by use of the spot-sealer 66 (FIG. 1) to bond the two plies together with area seals at 88.
  • area seals FIG. 15
  • non-interrupted perforations 56 the tear strip TS of the bag B8 is especially adapted for initial use as a handle, and for possible eventual use as a closure tie. While the perforations 56 (which extend only through the bag panel 46) may be interrupted to stop short of the side margins of the bag, an advantage of the FIG. 15 construction is that it eliminates the more elaborate mechanism for skipperforating.
  • the disclosed bags and bag forming method represent a marked improvement over bags of the separate closure-tie type, in that the ties are integral with the bags, cannot be lost, andare capable of being simultaneously produced at less cost than separate closure ties. Further, the conventional handling operations used for ordinary bags are not affected by the integral closure ties, and there are no separate handling steps required for the ties.
  • a bag forming method comprising the steps of moving a longitudinally folded web along a predetermined path, longitudinally perforating the entire bag near the upper longitudinal edge thereof, and transversely severing and sealing said web at spaced intervals to form one bag with two successive severing and sealing operations, the marginal portion of the perforated ply providing a tear strip at least partially separable from the thus formed bag for use as a closure tie, said perforating step producing interrupted perforations for leaving a part of said tear strip inseparable from the bag.
  • a bag forming method comprising the steps of moving a longitudinally folded web along a predetermined path, longitudinally perforating the entire bag near the upper longitudinal edge thereof, and transversely severing and sealing said web at spaced intervals to form one bag with two successive severing and sealing operations, the marginal portion of the perforated ply providing a tear strip at least partially separable from the thus formed bag for use as a closure tie, folding the marginal edge portion of the ply which ultimately forms said tear strip to make a double ply, and sealing said double plies together to form a double strength tear strip in the completed bag.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
US00226710A 1972-02-16 1972-02-16 Method of forming plastic bag with integral tie Expired - Lifetime US3779139A (en)

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US22671072A 1972-02-16 1972-02-16

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BE (1) BE792014A (fr)
CA (1) CA976013A (fr)
DE (1) DE2249584A1 (fr)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906702A (en) * 1972-09-29 1975-09-23 Sony Corp Method of packing
US3909330A (en) * 1972-11-17 1975-09-30 Alfred Schmermund Method of, and device for, providing a web of packaging material with a tear strip
US3915787A (en) * 1974-04-16 1975-10-28 Uniflex Edge capping and folding attachment for bag machines
US4094729A (en) * 1975-05-15 1978-06-13 Minigrip, Inc. Apparatus for making open profile bags
US4151787A (en) * 1977-09-01 1979-05-01 Union Carbide Corporation Multiple folded plastic bag method
WO1982003372A1 (fr) * 1981-04-06 1982-10-14 Andrew Mcg Martin Sachet pouvant etre ouvert et ferme facilement et dispositif de fabrication de celui-ci
WO1985004849A1 (fr) * 1984-04-16 1985-11-07 Martin Andrew Mcg Sachet facile a ouvrir et a refermer et appareil de fabrication
US4557384A (en) * 1984-03-12 1985-12-10 Hercules Membrino Pad of plastic bags
US4704101A (en) * 1983-06-30 1987-11-03 W.R. Grace & Co., Cryovac Div. Method for making a puncture resistant bag
US4709398A (en) * 1987-01-07 1987-11-24 Minigrip, Inc. Chain bags, method and apparatus
US5057065A (en) * 1989-12-08 1991-10-15 Reynolds Metals Company Process for making draw tape bags with integrally formed draw tapes
US5284002A (en) * 1992-02-25 1994-02-08 Simple Packaging Solutions, Inc. Apparatus and method for making a reclosable storage bag
WO1997043114A1 (fr) * 1996-05-13 1997-11-20 Simple Packaging Solutions, Llc. Sac de rangement refermable, procede de fabrication et appareil
USD410769S (en) 1996-08-12 1999-06-08 Dorizas Peter (Panagiotis) G Storage holder/protector
US6086524A (en) * 1992-02-25 2000-07-11 Martin; Andrew Mcg. Reclosable storage bag and method for making the same
US6440051B1 (en) * 2000-11-27 2002-08-27 Glopak, Inc. Method and apparatus for fabricating double-ended closure bags and double compartment bags
US20040001652A1 (en) * 2002-06-25 2004-01-01 Cryovac, Inc. Packaging bag, and method of and apparatus for manufacturing the same
US20050244085A1 (en) * 2004-04-30 2005-11-03 The Glad Products Company Tie bag
US20060018570A1 (en) * 2004-07-23 2006-01-26 Su Lin Co Plastic bag with integral tie strip
US20100220941A1 (en) * 2009-02-28 2010-09-02 Grand A. Int'l Co., Inc. Trash Bag
US20230415444A1 (en) * 2022-05-20 2023-12-28 Cmd Corporation Bag making machines and methods thereof

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0264950A3 (fr) * 1986-10-24 1989-12-06 Stiegler Gmbh Maschinenfabrik Sac en matière thermoplastique ainsi que procédé et dispositif pour la fabrication continue de ces sacs à partir de feuilles tubulaires
DE3636205A1 (de) * 1986-10-24 1988-05-05 Stiegler Maschf Gmbh Verfahren und vorrichtung zum kontinuierlichen herstellen von packsaecken, insbesondere muellsaecken aus folienschlaeuchen aus thermoplastischem kunststoff
DE9301593U1 (de) * 1993-02-05 1993-04-01 PelyPlastic GmbH & Co, 2362 Wahlstedt Verpackungsbeutel

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2643049A (en) * 1951-09-11 1953-06-23 Harold L Bartelt Quick opening bag
US3283672A (en) * 1961-06-09 1966-11-08 Bemis Co Inc Bag
US3308722A (en) * 1964-10-28 1967-03-14 Package Products Company Inc Method of forming merchandise container
US3411419A (en) * 1966-02-16 1968-11-19 Reynolds Metals Co Method of making a container having multilayer wall means
US3567074A (en) * 1968-10-25 1971-03-02 Cpc International Inc Pillow-type package that is convertible to a tetrahedronal package for mixing, storing and dispensing, with spray-type dispensing means
US3568576A (en) * 1967-07-01 1971-03-09 Michael Lehmacher Method of producing carrier bags
US3579397A (en) * 1966-08-16 1971-05-18 Windmoeller & Hoelscher Process of manufacturing bags having tear strips and consisting of synthetic thermoplastics

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2643049A (en) * 1951-09-11 1953-06-23 Harold L Bartelt Quick opening bag
US3283672A (en) * 1961-06-09 1966-11-08 Bemis Co Inc Bag
US3308722A (en) * 1964-10-28 1967-03-14 Package Products Company Inc Method of forming merchandise container
US3411419A (en) * 1966-02-16 1968-11-19 Reynolds Metals Co Method of making a container having multilayer wall means
US3579397A (en) * 1966-08-16 1971-05-18 Windmoeller & Hoelscher Process of manufacturing bags having tear strips and consisting of synthetic thermoplastics
US3568576A (en) * 1967-07-01 1971-03-09 Michael Lehmacher Method of producing carrier bags
US3567074A (en) * 1968-10-25 1971-03-02 Cpc International Inc Pillow-type package that is convertible to a tetrahedronal package for mixing, storing and dispensing, with spray-type dispensing means

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906702A (en) * 1972-09-29 1975-09-23 Sony Corp Method of packing
US3909330A (en) * 1972-11-17 1975-09-30 Alfred Schmermund Method of, and device for, providing a web of packaging material with a tear strip
US3915787A (en) * 1974-04-16 1975-10-28 Uniflex Edge capping and folding attachment for bag machines
US4094729A (en) * 1975-05-15 1978-06-13 Minigrip, Inc. Apparatus for making open profile bags
US4151787A (en) * 1977-09-01 1979-05-01 Union Carbide Corporation Multiple folded plastic bag method
WO1982003372A1 (fr) * 1981-04-06 1982-10-14 Andrew Mcg Martin Sachet pouvant etre ouvert et ferme facilement et dispositif de fabrication de celui-ci
US4704101A (en) * 1983-06-30 1987-11-03 W.R. Grace & Co., Cryovac Div. Method for making a puncture resistant bag
US4557384A (en) * 1984-03-12 1985-12-10 Hercules Membrino Pad of plastic bags
US4609107A (en) * 1984-04-16 1986-09-02 Andrew McG. Martin Easy open and reclosable bag having a separable reclosure tie
WO1985004849A1 (fr) * 1984-04-16 1985-11-07 Martin Andrew Mcg Sachet facile a ouvrir et a refermer et appareil de fabrication
US4709398A (en) * 1987-01-07 1987-11-24 Minigrip, Inc. Chain bags, method and apparatus
US5057065A (en) * 1989-12-08 1991-10-15 Reynolds Metals Company Process for making draw tape bags with integrally formed draw tapes
US6086524A (en) * 1992-02-25 2000-07-11 Martin; Andrew Mcg. Reclosable storage bag and method for making the same
US5284002A (en) * 1992-02-25 1994-02-08 Simple Packaging Solutions, Inc. Apparatus and method for making a reclosable storage bag
WO1997043114A1 (fr) * 1996-05-13 1997-11-20 Simple Packaging Solutions, Llc. Sac de rangement refermable, procede de fabrication et appareil
USD410769S (en) 1996-08-12 1999-06-08 Dorizas Peter (Panagiotis) G Storage holder/protector
US6440051B1 (en) * 2000-11-27 2002-08-27 Glopak, Inc. Method and apparatus for fabricating double-ended closure bags and double compartment bags
US6609998B2 (en) 2000-11-27 2003-08-26 Glopak Inc. Method and apparatus for fabricating double-ended closure bags and double compartment bags
US20040001652A1 (en) * 2002-06-25 2004-01-01 Cryovac, Inc. Packaging bag, and method of and apparatus for manufacturing the same
US20050244085A1 (en) * 2004-04-30 2005-11-03 The Glad Products Company Tie bag
US7347624B2 (en) * 2004-04-30 2008-03-25 The Glad Products Company Tie bag
US20060018570A1 (en) * 2004-07-23 2006-01-26 Su Lin Co Plastic bag with integral tie strip
US20100220941A1 (en) * 2009-02-28 2010-09-02 Grand A. Int'l Co., Inc. Trash Bag
US8465205B2 (en) * 2009-02-28 2013-06-18 Grand A International Co., Inc. Trash bag
US20230415444A1 (en) * 2022-05-20 2023-12-28 Cmd Corporation Bag making machines and methods thereof
US12280560B2 (en) 2022-05-20 2025-04-22 Cmd Corporation Bag making machines and methods thereof
US12485637B2 (en) * 2022-05-20 2025-12-02 Cmd Corporation Bag making machines and methods thereof
US12496797B2 (en) 2022-05-20 2025-12-16 Cmd Corporation Bag making machines and methods thereof
US12600107B2 (en) 2022-05-20 2026-04-14 Cmd Corporation Bag making machines and methods thereof

Also Published As

Publication number Publication date
BE792014A (fr) 1973-03-16
CA976013A (en) 1975-10-14
DE2249584A1 (de) 1973-08-30

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