US3920180A - Bag closure and method of making - Google Patents

Bag closure and method of making Download PDF

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Publication number
US3920180A
US3920180A US467643A US46764374A US3920180A US 3920180 A US3920180 A US 3920180A US 467643 A US467643 A US 467643A US 46764374 A US46764374 A US 46764374A US 3920180 A US3920180 A US 3920180A
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United States
Prior art keywords
seam
closure
closure according
apertures
draw
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Expired - Lifetime
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US467643A
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English (en)
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Gottfried Meier
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Individual
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Individual
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
    • B61D47/00—Loading or unloading devices combined with vehicles, e.g. loading platforms, doors convertible into loading and unloading ramps
    • 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
    • B65D33/28—Strings or strip-like closures, i.e. draw closures

Definitions

  • the rows of slits or holes, when on both sides of a seam, are staggered relative to each other and the ends thereof overlap.
  • the mouth of the bag will fold up as in the case of an eyelet type closure with the fold lines occurring in about the middle of the length of a slit or about halfway between each pair of holes connected by an incision.
  • the present invention relates to a draw-end or drawtape closure for the mouths of bags or sacks, especially bags or sacks made of fusible plastic, and having at least one draw-cord or draw-tape within a seam surrounding the mouth thereof, and to a method of making such a closure.
  • draw-cord or draw-tape closures for bags Two types are already known.
  • a draw-cord or draw-tape is provided within a tubular seam located near the opening, or mouth, of the bag.
  • a draw-cord is threaded in zig-zag fashion through eyelets disposed about the periphery of the bag at the mouth of the bag.
  • the known tubular seam closures have, as compared with the eyelet closures, the advantage that the drawcord or draw-tape may be introduced into the inside of the seam by machine by simply placing the draw-cord or draw-tape on the material before the folding over thereof to form the seam at the mouth of the bag.
  • Seam closures of this nature have the drawback that, in effecting closing of the bag mouth, a-comparatively large amount of force must be applied to the draw-cord because the seam material must be crowded together as the bag mouth is drawn closed.
  • the dimensions of the seam are reduced in that the bunched seam material reduces the passage therein and movement of the draw-cord therein is restricted. Furthermore, the nature of the closure is such that total closing of the sack or bag is not possible as the material of the seam cannot be compressed to a small dimension. The degree of closure possible is, thus, less than that possible with an eyelet type closure.
  • the cord pull closure according to the invention is characterized in that at least one of the two material strips forming the seam has a row of holes or slits extending in the longitudinal direction of the seam facilitating, upon drawing together, a formation of folds in the seam.
  • the closure according to the present invention is also characterized in that in a material web, preferably a plastic sheet. material, a row of holes or slits is made along a longitudinal edge and on both sides of the fold line near the edge after which a draw-cord or tape is positioned to overlie one of the rows of holes or slits and then a seam is made by folding an edge strip about fthe fold line and by forming a longitudinal weld line in the strip on one or both sides of the region containing the cord or tape.
  • the object of the present invention is to provide a draw-cord or like closure and a method of making, in which even large closure lengths can be closed with comparatively small traction force to a small remaining opening and which can be made simply and cheaply by machine avoiding manual work.
  • FIG. 1 shows a part of a draw-cord closure in perspective view.
  • FIG. 2 is a plan view of a draw-cord closure in the flat state, the draw-cord having been omitted in the interests of clarity.
  • FIG. 3 is a plan view of the edge area of a slitted sheet before folding the same to form the seam.
  • FIG. 4 is a perspective view of the upper part, or mouth, of a bag having a draw-cord closure according to the present invention.
  • FIG. 5 is a view corresponding to FIG. 2 and shows a modification wherein a draw-tape is utilized.
  • FIG. 6 is a view corresponding to FIG. 3 and shows an edge area of a sheet before folding of the seam to produce the arrangement according to FIG. 5.
  • draw-cord or draw-tape closure hereafter to be described is intended for use in the context of bags or sacks, and has particular reference to refuse sacks made of fusible synthetic plastic sheet materials.
  • a draw-cord or a drawtape 3 In a seam 2 formed along the opening, or mouth, of the bag or sack there is located a draw-cord or a drawtape 3.
  • the seam 2 includes rows of holes or slits, one such row being provided in the front material strip- 5 and another in the rear material strip 6.
  • the slits 7, 8 in the material strips 5 and 6 respectively, are displaced relative to one another in longitudinal direction, as is apparent from FIGS. 2 and 3.
  • the slits 7 and 8 are preferably of the same shape and length and are respectively disposed at opposite sides of a fold line 14.
  • each slit 7, 8 is preferably a little greater than one-half of the pitch t of the slits of a given row thereof so that the ends of the slit after the forming of the seam by folding rear material strip 6 about fold line 14 have an overlapping area 24, as can be seen in FIG. 2.
  • the width b of the slits 7, 8 is at least equal to the diameter of the draw-cord or to the width of the flat draw-tape 3, so that the cord or tape 3 can easily be drawn through the slits 7, 8 on closing the bag to which the closure is applied, as can be seen in FIG. 1.
  • the pitch t of the slits 7, 8 is equal to at least one-half of the width e of the seam and is preferably greater than such width e.
  • the pitch t of the slits 7, 8 conveniently lies between 3 and 6 cms and is preferably approximately 4 cm.
  • the seam material On closing the draw-cord closure, the seam material is, thus, not crumpled together irregularly, but is formed into zig-zag shaped folds 9, such that the cord or the tape 3 separates from the seam within the range of each of the slits 7, 8, as can be seen in FIG. 1.
  • the traction force necessarily applied to the draw-cord or draw-tape 3 for closing the bag is substantially less than if there were no such slits 7, 8 present.
  • the ready formation of folds and the free movement of the draw-cord or draw-tape 3 in the seam 2 is improved still further if, in addition to the weld seam 13 which serves to close the seam 2,'a further weld seam 12 is formed adjacent and parallel to the upper seam edge 4.
  • the two weld seams 12, 13 serve positivelyto locate the draw-cord or draw-tape 3 in the area of the slits 7 and 8 while also causing the remaining part of the seam 2 to lie flat.
  • the weld seam 12 also reduces the possibility of tearing the seam 2 by pulling the cord or tape 3 upward (as seen in FIG. 1).
  • seam 2 may also be formed from two separate material strips 5, 6 placed over one another and connected by weld seams 12, 13, instead of being formed by folding over an edge region, if so desired.
  • FIGS. 5 and 6 show a modified arrangement wherein oval holes 17, 18 are utilized, the respective rows of holes being provided at opposite sides of the foldline 14, and corresponding holes of the two rows being arranged in directly opposed disposition as distinct from being displaced in the longitudinal direction of the seam. Successive pairs of holes l7, 18 are joined by means of an incision l5, incisions of one row of holes being displaced relative to those of the other row, the openings thus having an I-shape.
  • the bag Upon pulling the draw-cord or draw-tape to close the closure, the bag will fold inwardly between holes on the outer wall of the seam which are joined by incisions, and the flaps 23 lying at either side of the incision bend out, to give free passage for the draw-cord or draw-tape 3, so that a similar action to that of the embodiment of FIGS. 1 to 3 wherein elongated slits are utilized results.
  • the bag On the inner wall of the seam, the bag folds toward the outside between holes that are joined by an incision.
  • a transverse weld seam 20 (FIG. 4) is formed approximately midway between the projecting ends of the cord or tape 21. If preferred, the two ends of the cord or tape 21 which project from one of the openings of the seam 2 may be connected to form an endless draw-cord or draw-tape.
  • the rows of holes or slits 7, 8 and l7, 18 respectively are formed before the welding of the scam in a flat unfolded plastic sheet at each side of and parallel to the fold line 14, the latter itself being parallel to a longitudinal edge 25 of the sheet.
  • the draw-cord or the draw-tape 3 is placed flat on the sheet parallel to and overlying a row of holes or slits, as seen in FIG. 3.'
  • the draw-cord or draw-tape 3 thus does not need to be looped through the holes or slits.
  • the seam '2 is formed by folding the outer marginal material strip 6 along the fold line 14 over the tape 3 and then forming a longitudinally extending weld to give wel seam 13.
  • Weld seam 12 is produced eithersimultaneously with the formation of weld seam 13, or subsequently thereto. These operations may be carried out either continuously or step-wise.
  • the welding is advantadraw-cords or draw-tapes may be provided, the draw- I cords or draw-tapes emerging from the seam .at respec- I tive, diametrically opposed portions. In this way,.a closure closing toward the middle of the sack or bag. is obtained.
  • Such a closure is especially suitable for large bags, such as refuse sacks, for example.
  • each aperture is in the form of a pair of holes spaced longitudi-.
  • a closure according to claim 1 in which said strips 7 are integrally joined along one edge and fonn said seam 1 upon folding along said one edge, and means joining the strips together along the side of. the seam remote.
  • a closure according to claim 1 in which said material is fusable plastic material, and said strips being integrally connected along one side of said seam and are V fused together along the other side of said seam. 5. A closure according to claim 4 in. which said strips are also fused together along said one side of said seam.
  • a closure according to claim 1 in which said out through respective onesof said apertures to reduce the effective length thereof in said seam thereby to reduce the diameter of said closure.
  • flexi-- ble means is a pair of draw elements which are drawn 9.
  • a closure according to claim 1 which includes means integrally joining said flexible means to at least one of said strips at at least one point.
  • a closure according to claim 1 in which said flexible means is fixedly connected to at least one of said strips at substantially diametrically opposite points while draw portions are provided on said flexible means extending out of the seam about midway between said points.
  • each aperture is longer than the distance between adjacent ends of adjacent apertures in the respective strip.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)
US467643A 1973-05-14 1974-05-07 Bag closure and method of making Expired - Lifetime US3920180A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT418673A AT331708B (de) 1973-05-14 1973-05-14 Schnur- oder bandzugverschluss fur beutel oder sacke

Publications (1)

Publication Number Publication Date
US3920180A true US3920180A (en) 1975-11-18

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US467643A Expired - Lifetime US3920180A (en) 1973-05-14 1974-05-07 Bag closure and method of making

Country Status (7)

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US (1) US3920180A (it)
AT (1) AT331708B (it)
CA (1) CA1020914A (it)
CH (1) CH577918A5 (it)
FR (1) FR2229624B1 (it)
GB (1) GB1427683A (it)
IT (1) IT1017605B (it)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938607A (en) * 1987-08-17 1990-07-03 Kelley Patrick W Sack-forming sheet
US5057065A (en) * 1989-12-08 1991-10-15 Reynolds Metals Company Process for making draw tape bags with integrally formed draw tapes
US5150970A (en) * 1991-09-23 1992-09-29 Albarelli Joseph M Open mesh carrying bag and method of making
US5160196A (en) * 1991-02-15 1992-11-03 Joseph Curtis Trash bag with mouth stiffener insert
US5184897A (en) * 1991-06-13 1993-02-09 Martin Gozdenovich Gift bag
WO1998029002A1 (en) * 1997-01-04 1998-07-09 Scapa Group Plc Flexible attachment means
DE19834485A1 (de) * 1998-07-31 2000-02-03 Andreas Schadenfroh Behältnis zur Aufnahme eines komprimierbaren Gegenstandes
US20040252921A1 (en) * 2003-06-13 2004-12-16 Winiarski Peggy B. Oven bag with pre-formed perforations
US20150251816A1 (en) * 2014-03-10 2015-09-10 Paula Elkins Odor-blocking disposal bag
US10486863B2 (en) * 2016-06-02 2019-11-26 MinWoo Lee Bag knot structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US209233A (en) * 1878-10-22 Improvement in bag-fasteners
US467108A (en) * 1892-01-12 cussen
US3752388A (en) * 1971-12-02 1973-08-14 Acme Paper Prod Co Ltd Plastic bag with integral strap handles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US209233A (en) * 1878-10-22 Improvement in bag-fasteners
US467108A (en) * 1892-01-12 cussen
US3752388A (en) * 1971-12-02 1973-08-14 Acme Paper Prod Co Ltd Plastic bag with integral strap handles

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938607A (en) * 1987-08-17 1990-07-03 Kelley Patrick W Sack-forming sheet
US5057065A (en) * 1989-12-08 1991-10-15 Reynolds Metals Company Process for making draw tape bags with integrally formed draw tapes
US5160196A (en) * 1991-02-15 1992-11-03 Joseph Curtis Trash bag with mouth stiffener insert
US5184897A (en) * 1991-06-13 1993-02-09 Martin Gozdenovich Gift bag
US5150970A (en) * 1991-09-23 1992-09-29 Albarelli Joseph M Open mesh carrying bag and method of making
WO1998029002A1 (en) * 1997-01-04 1998-07-09 Scapa Group Plc Flexible attachment means
DE19834485A1 (de) * 1998-07-31 2000-02-03 Andreas Schadenfroh Behältnis zur Aufnahme eines komprimierbaren Gegenstandes
US20040252921A1 (en) * 2003-06-13 2004-12-16 Winiarski Peggy B. Oven bag with pre-formed perforations
US20150251816A1 (en) * 2014-03-10 2015-09-10 Paula Elkins Odor-blocking disposal bag
US10486863B2 (en) * 2016-06-02 2019-11-26 MinWoo Lee Bag knot structure

Also Published As

Publication number Publication date
FR2229624B1 (it) 1978-01-20
CH577918A5 (it) 1976-07-30
CA1020914A (en) 1977-11-15
ATA418673A (de) 1975-11-15
FR2229624A1 (it) 1974-12-13
AT331708B (de) 1976-08-25
GB1427683A (en) 1976-03-10
IT1017605B (it) 1977-08-10

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