EP0761553A1 - Stapel von Tragegriff-Beuteln aus Kunststoff, Verfahren zum Herstellen des Stapels sowie Werkzeug zum Durchführen des Verfahrens - Google Patents

Stapel von Tragegriff-Beuteln aus Kunststoff, Verfahren zum Herstellen des Stapels sowie Werkzeug zum Durchführen des Verfahrens Download PDF

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Publication number
EP0761553A1
EP0761553A1 EP96202020A EP96202020A EP0761553A1 EP 0761553 A1 EP0761553 A1 EP 0761553A1 EP 96202020 A EP96202020 A EP 96202020A EP 96202020 A EP96202020 A EP 96202020A EP 0761553 A1 EP0761553 A1 EP 0761553A1
Authority
EP
European Patent Office
Prior art keywords
bundle
bag
bags
connecting piece
tool
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.)
Ceased
Application number
EP96202020A
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English (en)
French (fr)
Inventor
Daniel Valeri
Louis Mangin
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.)
Alplast Ste
Original Assignee
Alplast Ste
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9482134&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0761553(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Alplast Ste filed Critical Alplast Ste
Publication of EP0761553A1 publication Critical patent/EP0761553A1/de
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/001—Blocks, stacks or like assemblies of 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/86—Forming integral handles or mounting separate handles
    • B31B70/874—Forming integral handles or mounting separate handles involving punching or cutting

Definitions

  • the invention relates to a bundle of plastic suspender bags, each bag of the bundle having two large substantially parallel faces, generally substantially rectangular, connected along the bottom and the edges of the bag and comprising, opposite the bottom , two straps extending the edges of the bag and framing an opening, the ends of the straps remote from the bottom being connected by a transverse connecting piece, a precut being provided at the junction of the connecting piece and the internal edge of each strap so that a user can separate a bag from the bundle, held according to the stacking of the connecting pieces, by pulling on the bottom of the bag, the connecting piece separating from the straps according to the precut.
  • the bundle of bags is produced by stacking the bags and assembling by welding points or by stapling the connecting pieces of several superimposed bags.
  • the bundle thus produced is suspended at the stack of the connecting pieces.
  • Suspender bags thus assembled in bundles are used in many places, in particular in self-service stores.
  • a major drawback lies in the fact that one can tear off several bags simultaneously, voluntarily or not, and thus lose or drop a few bags.
  • the object of the invention is, above all, to provide a bundle of plastic suspender bags of the kind defined above which, while substantially preventing or braking the manual tearing of several bags thanks to an increase in resistance to tearing, avoids a transverse cut in the strap, and to obtain clean internal edges for the straps.
  • a bundle of plastic suspender bags as defined above, is characterized in that the precut between each strap and the associated connecting piece comprises cutting segments having a shape capable of causing, during traction on the bag to separate it from the bundle, a rupture leader directed towards the connecting piece.
  • the cutting segments for at least a part, are constituted by curved arcs turning their concavity towards the connecting piece. More preferably, all the cutting segments of a precut are in an arc of a curve.
  • the cutting segments are in the form of a half-sinusoid.
  • the axis of the curve, in particular of the half-sinusoid, constituting a cutting segment is directed towards the connecting piece.
  • the amplitude and the period of the half-sinusoid are determined according to the nature and the thickness of the material used for the bag, the height of the connecting piece and the resistance to tearing desired.
  • the wavelength of the sinusoid, half a wave of which constitutes a cutting segment is equal to twice the unit width of the attachment point.
  • the invention also relates to a plastic suspender bag, the suspenders of which are separated at the top, this bag being characterized in that the upper end of the inner edge of the suspenders has arcuate segments, preferably in shape of half-sinusoid, turning their concavity towards the other strap.
  • the bags of the bundle and the suspender bags separated from the bundle have bellows on their edges, the internal fold of the bellows being located, inward, beyond the internal edge of the strap.
  • the invention also relates to a method for preparing a bundle of suspender bags as defined above, method according to which a precut is made of the junction of the transverse connecting piece with the internal edges of the suspenders, this method being characterized by the fact that a precut is produced having arcuate segments of curve turning their concavity towards the connecting piece.
  • a precut is produced having arcuate segments of curve turning their concavity towards the connecting piece.
  • these curve arcs have the shape of a half-sinusoid.
  • the pre-cutting of the junction is carried out in press with a tool of suitable shape, this tool simultaneously ensuring the cutting of the opening framed by the straps.
  • the invention also relates to a tool for implementing the method defined above, this tool comprising two parallel branches, the edge of which has slots separated by solid parts or teeth, the branches being applied by their edges against the stacking of the connecting pieces of a bundle of bags in order to cut out the teeth separating the slots; this tool is characterized by the fact that the solid parts separating the slots have a cross section in arc of a curve turning its concavity towards the other branch.
  • this arc of curve has the shape of a half-sinusoid.
  • the two branches of the tool intended to perform the precut are formed by the extensions of two parallel sides of a frame used to make the opening surrounded by the straps.
  • Figure 1 of these drawings is an elevational view of a bundle of suspender bags according to the prior art.
  • Figure 2 is a section of a bag along line II-II of Figure 1.
  • Figure 3 is a perspective view of a bundle of suspender bags according to the invention.
  • FIG. 4 shows, on a larger scale, the detail A of the junction area of a connecting piece with the upper part of the strap of a bag of FIG. 3.
  • FIG. 5 is a perspective view, on a larger scale, of a tool for making the opening and the precut of the bundle of FIG. 3.
  • FIG. 6 is a side elevation view of the tool of FIG. 5.
  • FIG. 7 is a diagram illustrating the tear resistance of a bag according to the prior art, the tensile force exerted on the bag being carried on the ordinate and expressed in newtons, while the elongation of the bag is carried in abscissa and expressed in%.
  • Figure 8 finally, is a diagram similar to that of Figure 7 for the tearing of a bag from a bundle according to the invention.
  • Each bag has two large parallel faces 4a, 5a ( Figure 2), arranged in a vertical plane as shown in Figure 1.
  • the vertical edges of the faces 4a, 5a are connected by bellows 6a, 7a folded inward so that the concavity of these bellows faces outward.
  • the fold lines of the bellows are represented by the dashed lines 8a, 9a of FIG. 1.
  • the internal folds 8a, 9a are located, inwards, beyond the internal edge of the corresponding strap.
  • the bottom 10a of the bag is closed by welding.
  • the straps 2a, 3a frame a substantially rectangular opening 11a produced in particular by cutting using a tool (knife) of suitable shape, under press.
  • the ends of the straps 2a, 3a remote from the bottom 10a are connected transversely by a connecting tab 12a in the form of a rectangular bar.
  • the upper end 13a of the bag 1a is closed transversely by a weld bead.
  • the bags 1a are stacked in a direction orthogonal to their large faces 4a, 5a.
  • the assembly of the bundle is carried out by welding points or by stapling of several bags in the areas 14a of the connecting tab 12a.
  • a precut line 15a, 16a is made at the junction of the connecting tab 12a with the inner edges of the straps 2a, 3a.
  • Each precut line 15a, 16a comprises uncut areas constituting attachment points 17a whose dimension in the vertical direction is designated by 1. Generally, all the attachment points 17a have the same dimension 1.
  • the attachment points are located between cutting segments 18a represented by dashes.
  • the cutting segments 18a are constituted by rectilinear segments parallel to the edges of the large faces, that is to say vertical in the example of FIG. 1. These cut segments 18a are therefore oriented along the direction of the tensile force which is normally exerted on the bottom of the bag la to separate it from the bundle. The segments 18a are aligned on the vertical edges of the opening 11a.
  • this bag is detached (in principle along the precut lines 15a, 16a) from the connecting tab 12a which remains integral with the stack.
  • the arrangement is such that the force required to tear off a bag is low, the user can tear off simultaneously, voluntarily or by distraction, several bags and possibly drop a few. This can result in dirt and / or waste.
  • the rectilinear precuts 15a, 16a often generate, in response at a relatively high tensile force in the longitudinal direction (vertical according to the representation in FIG. 1), a tear which propagates in the transverse direction and which can cut the ramp.
  • a tear even if it does not completely cross the strap, weakens the latter, and rupture can occur when the bag is loaded with the disadvantage of its contents spilled on the floor.
  • the appearance of the upper part of the internal edge of the straps 2a, 3a corresponding to the cut will not be clear due to these tears or tear incipient.
  • the overall configuration of the bags 1 according to the invention is similar to that of the bags of the prior art and their description will not be repeated in detail.
  • the elements or parts of these bags similar or identical to elements or parts already described in connection with FIGS. 1 and 2 are designated by the same references not followed by the letter a.
  • the precuts 15, 16 comprise cutting segments 18 having a shape capable of causing, when the bag is pulled, a rupture initiation directed towards the connecting tab 12.
  • the cutting segments 18 are constituted by curved arcs turning their concavity towards the middle of the connecting lug 12. Preferably, all the cutting segments are in a curved arc. We can immediately see that the cutting arcs 18 located on the left side of FIG. 3 turn their concavity to the right while the curve arcs 18 located on the right turn their concavity to the left.
  • the curved arcs 18, separated by at least one attachment point 17 from the lower edge 19 of the stack of connecting tabs 12, are in the form of a half-sinusoid directed towards the axis of the bag.
  • the geometric axis X of each half-sinusoid is parallel to the edge 19.
  • the amplitude h of the half-sinusoid 18 and the half-wavelength p are determined as a function of the nature and the thickness of the material used for the bag 1, the height m of the connecting tab, and the desired tear resistance.
  • Cutting segments 18 ′ start from the lower edge 19 of the tab 12. More precisely, the starting point of these segments 18 ′ is constituted by the apex of the right angle formed between the lower edge 19 of the tab 12, and a vertical edge 20 of the opening 11.
  • the segment 18 ' is formed by a curved arc also turning its concavity towards the lug 12.
  • this arc of curve 18' has an extent substantially half that of the arcs 18 and is advantageously formed by a quarter of a sinusoid.
  • the arc 18 ′ is tangent to the edge 20 and goes towards the center of the tab 12.
  • the cutting segment 18 "which ends on the upper edge 21 of the tab 12 is symmetrical with the segment 18 with respect to the center line of the tab 12.
  • the quarter of a sinusoid formed by this arc of curve 18 "ends substantially at right angles to the upper edge 21.
  • a blanking of bags 1 is superimposed or stacked.
  • the large faces of these blanks, corresponding to the faces 4 and 5 of the finished bag, are devoid of the window 11 as well as the precuts 15, 16.
  • the bags are assembled in the bundle by welding points or by stapling the bags stacked at the areas 14 of the connecting lugs 12.
  • the opening 11 and the precuts 15, 16 are then produced, preferably simultaneously, in a press, using a punch tool 22 (fig. 5) of suitable shape.
  • the tool 22 has two parallel corrugated branches 23, 24, intended to be applied against the stack of blanks of bags by their lower edge 25, 26, the mean plane branches 23, 24 being arranged perpendicular to the large faces of the bags.
  • the lower sections 25, 26 have slots 27 of a height q (see FIG. 6) less than the height E of the corresponding branch.
  • the height q of the slots 27 is at least equal to the thickness of the bundle L when it is compressed in a press so that all the bags 1 of the bundle can be precut.
  • the slots 27 are provided in the bottom of the corrugations, that is to say in the zone 28 convex towards the inside of these corrugations, and correspond to the attachment points 17 of the precuts 15, 16 of FIG. 3.
  • the projecting parts 29 remaining between the slots form inwardly concave teeth, suitable for making the cutting segments 18 when the branches 23, 24 are pressed against the bundle L.
  • the tooth 29 'corresponding to the cutting 18' is formed by a segment of a curve half of the segments corresponding to the other teeth 29.
  • the teeth 29 have a semi-sinusoidal cross section, while the tooth 29 ', provided on each branch 23, 24 has the shape of a quarter of sinusoid.
  • the branches 23, 24 advantageously consist of an extension of the parallel sides of a frame 30 of the tool 22 intended to produce, in press, the opening 11.
  • the frame 30 comprises a cross member 31 suitable for cutting according to the lower edge 19 of the connecting lugs 12.
  • the junctions of the cross member 31 and of the branches 23, 24 correspond to the vertices of the upper corners of the opening 11 visible in FIG. 3.
  • the side 32 of the frame 30 opposite the cross member 31 has a central zone 33 constituted by a portion of cylindrical surface turning its concavity towards the inside, and whose generatrices are orthogonal to the mean plane of the frame 30.
  • the ends of the central zone 33 are connected to the sides of the frame 30 by flat portions 34, folded along an edge 35, on the side opposite to the cross-member 31.
  • the tool 22 can be produced using only two elements.
  • the other element is constituted by the cross member 31 connected, in particular by welding, to the branches 23, 24.
  • the lower edge of the tool 22 is sharpened to cut the windows 11 and the segments 18, 18 ', 18 ".
  • the branches 23, 24 may have a length K greater than the width m of the legs 12. In this case, it is not necessary to provide slots 27 beyond the width m.
  • the bags of the bundle L by virtue of the precuts 15, 16 may have a sufficient tear resistance to practically prevent the manual tearing of several bags simultaneously, without however the integrity of the bib bag, taken from the bundle, is damaged by a transverse rupture initiator at the level of the upper part of the suspenders.
  • the inner edge of the straps of a bag detached from the bundle has, at its upper end, segments in a curved arc, corresponding to the cutting segments 18, 18 ′, 18 ".
  • the sinusoidal shape of the branches 23, 24 of the precut tool 22 can be produced by forming between two pinions of the same pitch, more or less separated as a function of the amplitude sought. This shape significantly increases the rigidity of the blade which allows a lower cutting force and reduces the risk of matting of the cut bundle due to parasitic forces.
  • FIGS. 7 and 8 The increase in tear resistance due to the precut of the invention is illustrated by the diagrams in FIGS. 7 and 8 corresponding to tests carried out on a bundle of bags in accordance with the prior art, for FIG. 7, and bags according to the invention for FIG. 8, the parameters (material used, dimensions, etc.) of the bags of the two bundles being the same, only the precut being modified.
  • the tests were carried out on a traction machine, the bundle of bags being positioned vertically.
  • the stack of connecting tabs 12a, 12 was pinched at its middle part by the upper jaws of the machine.
  • the bag on which the measurement was made was held by the lower jaws of the machine.
  • Each bundle included one hundred bags.
  • the tests were carried out, for each bundle, on ten bags chosen at random.
  • the jaws of the traction machine were gradually moved apart at a speed of about 150 mm / min.
  • the distance between the jaws at the start of the test was approximately 100 mm.
  • FIGS. 7 and 8 show, on the abscissa, the elongation, that is to say the relative increase in the distance between the jaws.
  • the tensile force F expressed in newtons is plotted on the ordinate.
  • the tensile force to be exerted becomes greater than 20 newtons.
  • the tearing is carried out in good conditions at the attachment points 17 which do not are not frayed or show no initiation at break.
EP96202020A 1995-08-29 1996-07-16 Stapel von Tragegriff-Beuteln aus Kunststoff, Verfahren zum Herstellen des Stapels sowie Werkzeug zum Durchführen des Verfahrens Ceased EP0761553A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9510160A FR2738225B1 (fr) 1995-08-29 1995-08-29 Liasse de sacs a bretelles en matiere plastique, sac a bretelles, procede de preparation de la liasse et outil pour la mise en oeuvre du procede
FR9510160 1995-08-29

Publications (1)

Publication Number Publication Date
EP0761553A1 true EP0761553A1 (de) 1997-03-12

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ID=9482134

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EP96202020A Ceased EP0761553A1 (de) 1995-08-29 1996-07-16 Stapel von Tragegriff-Beuteln aus Kunststoff, Verfahren zum Herstellen des Stapels sowie Werkzeug zum Durchführen des Verfahrens

Country Status (2)

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EP (1) EP0761553A1 (de)
FR (1) FR2738225B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2309957A (en) * 1996-01-18 1997-08-13 Cascade Dispensers Ltd A dispenser for bags and a stack of bags
WO1999056967A1 (en) * 1998-04-30 1999-11-11 Kozlov Aleandr S Publication assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2204638A1 (de) * 1971-08-17 1973-08-16 Hans Lehmacher Verfahren zum herstellen von zu einem block zu stapelnden beuteln aus thermoplastischer kunststoffolie
FR2539825A1 (fr) * 1983-01-20 1984-07-27 Rastello Jacques Dispositif de formage de sacs bretelles pour leur mise en liasse permettant leur detachement par unite
US4493419A (en) * 1983-11-03 1985-01-15 Mobil Oil Corporation Thermoplastic bag and bag pack
GB2234734A (en) * 1989-06-23 1991-02-13 Welton Packaging Limited Bundles of carrier bags and a method of dispensing bags from the bundle
US5248040A (en) * 1991-10-15 1993-09-28 Polytec Packaging Self opening dual tab merchandising bag
GB2275911A (en) * 1993-03-11 1994-09-14 Alida Holdings Plc Plastic carrier bags

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2204638A1 (de) * 1971-08-17 1973-08-16 Hans Lehmacher Verfahren zum herstellen von zu einem block zu stapelnden beuteln aus thermoplastischer kunststoffolie
FR2539825A1 (fr) * 1983-01-20 1984-07-27 Rastello Jacques Dispositif de formage de sacs bretelles pour leur mise en liasse permettant leur detachement par unite
US4493419A (en) * 1983-11-03 1985-01-15 Mobil Oil Corporation Thermoplastic bag and bag pack
GB2234734A (en) * 1989-06-23 1991-02-13 Welton Packaging Limited Bundles of carrier bags and a method of dispensing bags from the bundle
US5248040A (en) * 1991-10-15 1993-09-28 Polytec Packaging Self opening dual tab merchandising bag
GB2275911A (en) * 1993-03-11 1994-09-14 Alida Holdings Plc Plastic carrier bags

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2309957A (en) * 1996-01-18 1997-08-13 Cascade Dispensers Ltd A dispenser for bags and a stack of bags
US5860529A (en) * 1996-01-18 1999-01-19 Cascade Dispensers Limited Dispensers for bags, and bags for use therewith
GB2309957B (en) * 1996-01-18 1999-05-12 Cascade Dispensers Ltd Dispensers for bags and bags for use therewith
WO1999056967A1 (en) * 1998-04-30 1999-11-11 Kozlov Aleandr S Publication assembly

Also Published As

Publication number Publication date
FR2738225A1 (fr) 1997-03-07
FR2738225B1 (fr) 1997-10-17

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