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EP0256375A1 - Method and apparatus for the production of a stack of bags - Google Patents

Method and apparatus for the production of a stack of bags Download PDF

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Publication number
EP0256375A1
EP0256375A1 EP87110985A EP87110985A EP0256375A1 EP 0256375 A1 EP0256375 A1 EP 0256375A1 EP 87110985 A EP87110985 A EP 87110985A EP 87110985 A EP87110985 A EP 87110985A EP 0256375 A1 EP0256375 A1 EP 0256375A1
Authority
EP
European Patent Office
Prior art keywords
bags
perforation
bag
stack
perforation lines
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.)
Granted
Application number
EP87110985A
Other languages
German (de)
French (fr)
Other versions
EP0256375B1 (en
Inventor
Günter Mattiebe
Klaus Ullmann
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Priority to AT87110985T priority Critical patent/ATE57352T1/en
Publication of EP0256375A1 publication Critical patent/EP0256375A1/en
Application granted granted Critical
Publication of EP0256375B1 publication Critical patent/EP0256375B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • 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
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0014—Flexible containers made from webs by folding webs longitudinally having their openings facing transversally to the direction of movement
    • 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
    • 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/16—Cutting webs
    • B31B70/18—Cutting webs longitudinally
    • 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
    • B31B70/92—Delivering
    • B31B70/98—Delivering in stacks or bundles
    • B31B70/984—Stacking bags on wicket pins

Definitions

  • the invention relates to a stack of bags, consisting of rectangular film sections made of thermoplastic plastic, which are folded around themselves at their bottom folding edges, with side weld seams and on their opening sides with central grip holes and lateral corner pieces delimited by perforation lines, which have aligned stack holes.
  • DE-GMS 74 29 628 discloses a stack of bags of this type, in which, in order to save material, the usual hanging strips, which extend over the width of the bag and are provided with hanging holes and from which the bags are torn along a perforation line, have been dispensed with.
  • the object of the invention is to create a stack of bags of the type specified at the outset, which enables further material savings with easier handling.
  • this object is achieved in a bag stack of the generic type in that only the rear wall of each bag is provided with perforation lines delimiting its two upper corner areas and in that the bag front wall has cutouts in its corner areas which are approximately congruent with the corner areas of the rear wall.
  • the stack of bags according to the invention enables a material saving of 50% compared to the known stack of bags, because only the rear walls of the bags are provided with corner areas serving for stacking and holding.
  • the individual pouch can be more easily torn off the stack of pouches because only one perforation line covering a wall has to be severed for this purpose.
  • the perforation lines are expediently curved, preferably quarter-circular, with parts approximately perpendicular to the opening and side edges.
  • the perforation lines have webs of different lengths, the web lengths being adapted to the course of force when the bags are torn off along the perforation lines and the possible curve shape of the perforation lines in such a way that tearing along the perforation line is ensured.
  • This configuration is particularly advantageous and expedient for reasons of simple and economical production of the bags according to the invention.
  • the bags according to the invention are expediently produced starting from a flat plastic film web, the side parts of which are folded over onto the middle part in such a way that their side edges lie at a close distance from their center line.
  • the tucked-in side parts of the plastic film web are weakened by semicircular punched-outs, so that further weakening of the middle part should also be avoided. Since the perforation lines have to be made in the middle part, the weakening cannot be completely dispensed with.
  • the web lengths of the punched perforation lines are designed in such a way that weakening of the web is avoided as far as possible on the one hand, but on the other hand non-destructive tearing of the bags from the bag block is ensured.
  • the perforation lines can be arranged such that they have long material webs in the areas of the opening edge and the side edge of the bag and shorter material webs between them. This arrangement of the shorter and longer webs of material takes into account the tensile and shear stresses occurring in the web, so that the web is not subject to any noteworthy expansions in spite of the punched-in perforation lines.
  • the material webs expediently decrease in length from the long to the short, so that good tearing of the bags from the stack is ensured after the tearing at the side edges.
  • the film tends to tear in a straight line. If the tear-off perforation line has a curved shape, shorter webs ensuring better tear-off should be provided, in particular in the area of curvature.
  • each bag expediently ends in front of the upper edge of the rear wall, so that the latter has an overlap-free strip.
  • Such an embodiment of stacked bags is known per se from DE-OS 24 08 831.
  • the bags are blocked together in the stack in the region of the perforated corners. are.
  • the blocking can also take place in the area of the stacking or hanging holes.
  • a method for producing the bags according to the invention is characterized in that the side parts of a plastic film web are folded over onto the middle part of the film in such a way that their side edges lie close together in front of their center line, so that the plastic film web folded in this way is intermittently one punched and one bag wide Welding stations are promoted in which the corner areas of the later rear walls of four bags lying side by side and in pairs in mirror image to each other are provided with a closed line with the perforation lines and with the stack holes, followed by the corner punching cutouts of the later bag front walls, then the finger hole punching and the bag side seams Cross-weld separating seams or cross-weld seams in pairs with cross-cuts lying between them and finally the bags still connected in pairs by along the middle cuts made on the plastic film web are never separated and stacked.
  • the cuts forming the tear-off perforation lines and corner punch cut-outs can be made by circumferential circular or elliptical cuts. However, the cut forming the corner punch cutouts is interrupted by the gap existing between the inward-tipped side edges of the web.
  • the tear-off perforation lines are rectilinear in their end regions and are approximately at right angles on the side and opening edges.
  • the circumferential cutting lines or tear-off perforation lines are designed as square cutting lines with rounded corners or polygonal cutting lines such that the perforation lines entering the side and opening edges are approximately at right angles to these.
  • the stack of bags 1 consists of stacked bags 2 which have been formed from rectangular plastic film sections by folding around the bottom fold line 3 on themselves.
  • the opening edges 4 of the front walls end at a distance from the opening edges 5 of the rear walls of the bags 2, so that overlapping strips 6 of the rear wall are formed on the opening side.
  • the bags 2 are provided in the middle with grip hole punchings 7 in the usual way.
  • the front walls of the bags 2 are provided with approximately quarter-circular punched-outs which are delimited by the cutting edges 8.
  • the back walls are approximately congruent with these cut edges with quarter-circle perforation lines 9.
  • the corner regions 10 of the rear walls, delimited by the perforation lines 9, are provided with punched holes 11 which are used for stacking and / or hanging the stacked bags 2.
  • the perforation lines 9 approximately perpendicular in the upper opening edges and in the lateral Shrink edges.
  • the perforation lines 9 have longer material webs 1 2, 13 in the area of the opening edges 5 and in the area of the sides.
  • the material webs 12, 13 are represented by solid lines. An area with shorter material webs is provided between the longer material webs 12, 13.
  • cut edges 8 and the perforation lines 9 are arranged approximately congruently. In the drawing they are shown offset from one another for the sake of clarity.
  • the individual bags 2 are provided in the usual way with side welds.
  • the side parts 15, 16 of a plastic film web are knocked onto the middle part 17 around the folded edges 3, in such a way that the inner side edges 18, 19 lie at a distance from the center line 20.
  • the double-folded web 21 prepared in this way is then conveyed by a conveyor in a known manner intermittently by steps corresponding to a bag width through the punching station 22, in which the corner configurations of the later bags are punched.
  • the punching device consists of a knife plate 23 which is fixed to the frame and which is provided with four punching tools 24 with an annular cutting edge for punching the stacking or holding holes 11 and with perforation knives 25 enclosing them in a circular manner is provided, which serve to punch the perforation lines 9.
  • the abutment plate 26 is lowered onto the corresponding central part 17 of the plastic film web 21.
  • the abutment plate 26 is attached to its actuation on the piston rod 28 of the cylinder 29 fixed to the frame.
  • the upper side of the abutment plate 26 serves as an abutment for the likewise circularly arranged knives 30 which are arranged on the knife plate 31.
  • the knife plate 31 is actuated by the piston rods 32, 33 of cylinders 34, 35, which are fastened to a holding plate 36, which in turn are fastened on the piston rod 28 of the cylinder 29.
  • the gap formed between the side edges 18, 19 of the film web 21 is so wide; that it is able to accommodate the piston rod 28, so that the abutment plate 26 can be inserted between the middle part 17 and the turned-in side parts 15, 16 of the film web 21.
  • the cylinders 29, 34, 35 are provided in a manner not shown with supply hoses through which a pressure medium, for example oil or compressed air, is supplied.
  • a pressure medium for example oil or compressed air
  • the ring-shaped knife 30 arranged on the underside of the knife plate 31 punches the corner cutouts 8 into the later corner areas of the folded-in web parts.
  • the width of the cutters 25 which cut the perforations 9 is such that the perforation cut has long web parts 12 in the transverse direction of the web and short web parts 13 in the longitudinal direction of the web.
  • the individual bags are later welded off from the web 21 provided with the corresponding corner configurations along the dashed cross lines 40 by cross-weld separating seams.
  • the double bags connected in this way in the area of the center line are later separated from one another by longitudinal cuts.
  • the finger hole punchings 7 can be punched with the cross weld separating seams or else separately.
  • Fig. 5 shows a plan view of a plastic film sheet 41, which is provided in the corner areas of the still connected bags with a square circumferential perforation punch cut 42 and an approximately congruent cut along a cutting line 43, which in the area of the longitudinal center line 20 of the film web through the between the inner edges 44, 45 of the formed web parts gap is interrupted.
  • the square perforation cuts and cutouts have rounded corners such that they open at right angles in the manner shown in the later opening edges and side edges of the bags.
  • the perforation cuts 42 are made in the area of the side edges and opening edges of the later bags with longer webs and between them with shorter webs.
  • FIG. 4 shows a top view of a plastic film web which is provided in the area of the corners of the still connected bags with a round perforated punch cut 46 and a roughly identical, likewise round cutout 47.
  • the webs of the perforation punch cuts each 0.5 mm long and only 0.3 mm long between them.
  • FIG. 6 shows a plan view of a plastic film web which is provided with an octagonal perforation cut 48 and an approximately congruent cutout 49 in the area of the still connected corners of the later bags.
  • the octagonal shape of the perforation punch cuts ensures that they open into the later opening edges and side edges of the bags with relatively long legs.
  • the legs of the perforation punch lines, which are approximately vertical on the later opening edges and side edges of the bags, are formed with longer webs.
  • a knife plate 51 is fastened to a carrier 50 of the frame with a circular perforation knife 52.
  • a holder 55 for an abutment plate .56 which covers the perforation knife 52, is fastened to guide bolts 53, 54.
  • the guide bolts 53, 54 are guided in the bores of a guide plate 57 of the frame so as to be longitudinally displaceable.
  • the abutment plate 56 is held in its upper position by compression springs 58.
  • a circular punching knife 60 is fastened to the piston rod 61 of the pneumatic cylinder 62 above the abutment plate 56.
  • the guide bolts 53, 54 engage between the gap which is formed between the inner edges of the folded-in side parts of the film web 45, so that the abutment plate 56 lies between the middle part and the turned-in side parts of the film web 45.
  • the abutment plate 56 After lifting the upper punching knife 60, the abutment plate 56 also lifts off the lower perforation knife 52 under the action of the compression springs, so that the web 45 can be moved intermittently.
  • Punching tools 65 are provided for executing the suspension holes and are fastened to the piston rod of a pneumatic cylinder 67 via a carrier plate 66.
  • the punching tools 65 pass through the knife plate 51 and the abutment plate 56 in corresponding bores which also serve as guides. During the execution of the punch cuts and the formation of the circumferential perforation lines, the punch tools 65 are extended and returned to punch the hanging holes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Bag Frames (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Steroid Compounds (AREA)

Abstract

Ein Beutelstapel besteht aus aus rechteckigen Folienabschnitten aus thermoplastischem Kunststoff hergestellten Beuteln, die um ihre Bodenfaltkanten auf sich gefaltet, mit Seitenschweißnähten und an ihren Öffnungsseiten mit griffigen Grifflochausstanzungen und seitlichen, durch Perforationslinien begrenzten Eckstücken versehen sind, die miteinander fluchtende Stapel- oder Aufhängelöcher aufweisen. Um eine erleichterte Handhabung und eine Materialeinsparung zu schaffen, ist nur die Beutelrückwandung jedes Beutels (2) mit die beiden oberen Endbereiche begrenzenden Perforationslinien (9) versehen. Die Beutelvorderwand weist in ihren Eckbereichen Ausschnitte auf, die durch etwa mit den Perforationslinien (9) deckungsgleiche Trennschnitte gebildet sind.A stack of bags consists of bags made of rectangular film sections made of thermoplastic plastic, which are folded around themselves at their bottom folding edges, with side weld seams and on their opening sides with handy grip hole punchings and lateral corner pieces delimited by perforation lines, which have stacking or hanging holes aligned with one another. In order to facilitate handling and to save material, only the back wall of each bag (2) is provided with perforation lines (9) delimiting the two upper end regions. The front wall of the bag has cutouts in its corner areas which are formed by separating cuts which are congruent with the perforation lines (9).

Description

Die Erfindung betrifft einen Beutelstapel, bestehend aus aus rechteckigen Folienabschnitten aus thermoplastischem Kunststoff gebildeten Beuteln, die um ihre Bodenfaltkanten auf sich gefaltet, mit Seitenschweißnähten und an ihren Öffnungsseiten mit mittigen Grifflochstanzungen und seitlichen, durch Perforationslinien begrenzten Eckstücken versehen sind, die fluchtende Stapellöcher aufweisen.The invention relates to a stack of bags, consisting of rectangular film sections made of thermoplastic plastic, which are folded around themselves at their bottom folding edges, with side weld seams and on their opening sides with central grip holes and lateral corner pieces delimited by perforation lines, which have aligned stack holes.

Ein Beutelstapel dieser Art, bei dem zur Materialeinsparung auf den sonst üblichen, sich über die Beutelbreite erstreckenden und mit Aufhängelöchern versehenen Aufhängestreifen, von dem die Beutel längs einer Perforationslinie abgerissen werden, verzichtet worden ist, ist aus der DE-GMS 74 29 628 bekannt.DE-GMS 74 29 628 discloses a stack of bags of this type, in which, in order to save material, the usual hanging strips, which extend over the width of the bag and are provided with hanging holes and from which the bags are torn along a perforation line, have been dispensed with.

Aufgabe der Erfindung ist es, einen Beutelstapel der eingangs angegebenen Art-zu schaffen, der bei erleichterter Handhabung eine weitere Materialeinsparung ermöglicht.The object of the invention is to create a stack of bags of the type specified at the outset, which enables further material savings with easier handling.

Erfindungsgemäß wird diese Aufgabe bei einem Beutelstapel der gattungsgemäßen Art dadurch gelöst, daß nur die Rückwand jedes Beutels mit deren beiden oberen Eckbereiche begrenzenden Perforationslinien versehen ist und daß die Beutelvorderwand in ihren Eckbereichen Ausschnitte aufweist, die etwa deckungsgleich mit den Eckbereichen der Rückwand sind. Der erfindungsgemäß Beutelstapel ermöglicht gegenüber dem bekannten Beutelstapel eine 50%ige Materialeinsparung, weil nur die Rückwände der Beutel mit der Stapelung und Halterung dienenden Eckbereichen versehen sind. Weiterhin läßt sich der einzelne Beutel leichter von dem Beutelstapel abreissen, weil hierzu nur eine eine Wandung erfassende Perforationslinie zu durchtrennen ist.According to the invention, this object is achieved in a bag stack of the generic type in that only the rear wall of each bag is provided with perforation lines delimiting its two upper corner areas and in that the bag front wall has cutouts in its corner areas which are approximately congruent with the corner areas of the rear wall. The stack of bags according to the invention enables a material saving of 50% compared to the known stack of bags, because only the rear walls of the bags are provided with corner areas serving for stacking and holding. Furthermore, the individual pouch can be more easily torn off the stack of pouches because only one perforation line covering a wall has to be severed for this purpose.

Zweckmäßigerweise sind die Perforationslinien kurvenförmig, vorzugsweise viertelkreisförmig, mit etwa senkrecht zu den Öffnungs- und Seitenrändern stehenden Teilen ausgebildet.The perforation lines are expediently curved, preferably quarter-circular, with parts approximately perpendicular to the opening and side edges.

Nach einer besonderen erfinderischen Ausgestaltung ist vorgesehen, daß die Perforationslinien unterschiedlich lange Stege aufweisen, wobei die Steglängen dem Kraftverlauf beim Abreißen der Beutel entlang der Perforationslinien und der eventuellen Kurvenform der Perforationslinien in der Weise angepaßt sind, daß ein Abriß entlang der Perforationslinie gewährleistet ist. Diese Ausgestaltung ist aus Gründen einer einfachen und wirtschaftlichen Herstellung der erfindungsgemäßen Beutel besonders vorteilhaft und zweckmäßig. Denn die erfindungsgemäßen Beutel werden zweckmäßigerweise ausgehend von einer flach liegenden Kunststoffolienbahn hergestellt, deren Seitenteile derart auf deren Mittelteil umgelegt werden, daß deren Seitenkanten im dichten Abstand vor deren Mittellinie liegen. Bei der Bearbeitung dieser derart gefalteten Kunststoffolienbahn muß diese vor dem Querabschweißen der einzelnen Beutel Zugspannungen aufnehmen und ohne wesentliche Dehnungen übertragen. Bei der Herstellung der Beutel werden die eingeschlagenen Seitenteile der Kunststoffolienbahn durch halbkreisflörmige Ausstanzungen geschwächt, so daß eine weitere Schwächung auch des Mittelteils vermieden werden sollte. Da die Perforationslinien in dem Mittelteil angebracht werden müssen, kann auf dessen Schwächung nicht vollständig verzichtet werden. Die Steglängen der gestanzten Perforationslinien werden erfingungsgemäß also so ausgestaltet, daß einerseits eine Schwächung der Bahn möglichst vermieden wird, andererseits aber auch ein zerstörungsfreier Abriß der Beutel von dem Beutelblock gewährleistet ist.According to a special inventive embodiment, it is provided that the perforation lines have webs of different lengths, the web lengths being adapted to the course of force when the bags are torn off along the perforation lines and the possible curve shape of the perforation lines in such a way that tearing along the perforation line is ensured. This configuration is particularly advantageous and expedient for reasons of simple and economical production of the bags according to the invention. This is because the bags according to the invention are expediently produced starting from a flat plastic film web, the side parts of which are folded over onto the middle part in such a way that their side edges lie at a close distance from their center line. When editing this plastic film web folded in this way must absorb tensile stresses before the transverse welding of the individual bags and transmit them without substantial strains. During the manufacture of the bags, the tucked-in side parts of the plastic film web are weakened by semicircular punched-outs, so that further weakening of the middle part should also be avoided. Since the perforation lines have to be made in the middle part, the weakening cannot be completely dispensed with. According to the invention, the web lengths of the punched perforation lines are designed in such a way that weakening of the web is avoided as far as possible on the one hand, but on the other hand non-destructive tearing of the bags from the bag block is ensured.

Die Perforationslinien können so angeordnet werden, daß sie in den Bereichen des Öffnungsrandes und der Seitenkante der Beutel lange Materialstege und zwischen diesen kürzere Materialstege aufweisen. Diese Anordnung der kürzeren und längeren Materialstege trägt den in der Bahn auftretenden Zug- und Scherspannungen Rechnung, so daß die Bahn trotz der eingestanzten Perforationslinien keinen nennenswerten Dehnungen unterliegt.The perforation lines can be arranged such that they have long material webs in the areas of the opening edge and the side edge of the bag and shorter material webs between them. This arrangement of the shorter and longer webs of material takes into account the tensile and shear stresses occurring in the web, so that the web is not subject to any noteworthy expansions in spite of the punched-in perforation lines.

Sollte beim Abriß der Beutel von dem Beutelstapel der Anriß im Bereich der Beutelseitenkanten erfolgen, können die längeren Materialstege der Abreißperforationslinien in Kauf genommen werden, weil dieser Bereich ohnehin durch die Seitenschweißnaht geschwächt ist.Should the tearing of the pouch from the stack of bags occur in the area of the bag side edges, the longer material webs of the tear-off perforation lines can be accepted because this area is weakened anyway by the side weld seam.

Zweckmäßigerweise nehmen die Materialstege in ihrer Länge von den langen zu den kurzen hin kontinuierlich ab, so daß ein guter Abriß der Beutel von dem Stapel nach dem Anriß an den Seitenkanten gewährleistet ist. Bei der Verteilung der kürzeren und längeren Materialstege ist zu beachten, daß die Folie aufgrund der Materialeigenschaften bestrebt ist, geradlinig weiterzureißen. Weist die Abreißperforationslinie eine gekrümmte Form auf, sollten insbesondere im Krümmungsbereich einen besseren Abriß gewährleistende kürzere Stege vorgesehen werden.The material webs expediently decrease in length from the long to the short, so that good tearing of the bags from the stack is ensured after the tearing at the side edges. When distributing the shorter and longer material webs, it should be noted that due to the material properties, the film tends to tear in a straight line. If the tear-off perforation line has a curved shape, shorter webs ensuring better tear-off should be provided, in particular in the area of curvature.

Zweckmäßigerweise endet die Oberkante der Öffnungsseite der Vorderwand jedes Beutel vor der Oberkante der Rückwand, so daß diese einen überdeckungsfreien Streifen aufweist. Eine derartige Ausgestaltung von gestapelten Beuteln ist an sich aus der DE-OS 24 08 831 bekannt.The upper edge of the opening side of the front wall of each bag expediently ends in front of the upper edge of the rear wall, so that the latter has an overlap-free strip. Such an embodiment of stacked bags is known per se from DE-OS 24 08 831.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß die Beutel in dem Stapel im Bereich der perforierten Ecken miteinander verblockt. sind. Die Verblockung kann auch im Bereich der Stapel- oder Aufhängelöcher erfolgen.In a further embodiment of the invention it is provided that the bags are blocked together in the stack in the region of the perforated corners. are. The blocking can also take place in the area of the stacking or hanging holes.

Ein Verfahren zur Herstellung der erfindungsgemäßen Beutel zeichnet sich erfindungsgemäß dadurch aus, daß die Seitenteile einer Kunststoffolienbahn derart auf deren Mittelteil umgelegt werden, daß deren Seitenkanten in dichtem Abstand vor deren Mittellinie liegen, daß die derart gefaltete Kunststoffolienbahn intermittierend um jeweils eine Beutelbreite durch Stanz- und Schweißstationen gefördert wird, in denen zunächst die Eckbereiche der späteren Rückwände von vier nebeneinander und paarweise spiegelbildlich zueinander liegenden Beuteln durch eine geschlossene Linie mit den Perforationslinien und mit den Stapellöchern versehen, nachfolgend die Eckstanzausschnitte der späteren Beutelvorderwandungen ausgeführt, anschliessend die Grifflochausstanzungen und die die Beutelseitennähte bildenden Querschweißtrennnähte oder paarweisen Querschweißnähte mit zwischen diesen liegenden Quertrennschnitten angebracht und schließlich die noch paarweise zusammenhängenden Beutel durch längs der Mittellinie der Kunststoffolienbahn ausgeführte Schnitte voneinander getrennt und gestapelt werden.A method for producing the bags according to the invention is characterized in that the side parts of a plastic film web are folded over onto the middle part of the film in such a way that their side edges lie close together in front of their center line, so that the plastic film web folded in this way is intermittently one punched and one bag wide Welding stations are promoted in which the corner areas of the later rear walls of four bags lying side by side and in pairs in mirror image to each other are provided with a closed line with the perforation lines and with the stack holes, followed by the corner punching cutouts of the later bag front walls, then the finger hole punching and the bag side seams Cross-weld separating seams or cross-weld seams in pairs with cross-cuts lying between them and finally the bags still connected in pairs by along the middle cuts made on the plastic film web are never separated and stacked.

Die die Abreißperforationslinien und Eckstanzausschnitte bildenden Schnitte können durch umlaufende kreis- oder ellipsenförmige Schnitte ausgeführt werden. Dabei ist allerdings der die Eckstanzausschnitte bildende Schnitt durch den zwischen den nach innen geschlagenen Seitenkanten der Bahn vorhandenen Spalt unterbrochen.The cuts forming the tear-off perforation lines and corner punch cut-outs can be made by circumferential circular or elliptical cuts. However, the cut forming the corner punch cutouts is interrupted by the gap existing between the inward-tipped side edges of the web.

.Besonders günstig ist es, wenn die Abreißperforationslinien in ihren Endbereichen geradlinig ausgebildet sind und etwa rechtwinkelig auf den Seiten- und Öffnungskanten stehen. In weiterer Ausgestaltung der Erfindung ist daher vorgesehen, daß die umlaufenden Schnittlinien bzw. Abreißperforationslinien als viereckige Schnittlinien mit abgerundeten Ecken oder mehreckige Schnittlinien derart ausgeführt werden, daß die in die Seiten- und Öffnungskanten einlaufenden Perforationslinien etwa rechtwinkelig zu diesen stehen.It is particularly favorable if the tear-off perforation lines are rectilinear in their end regions and are approximately at right angles on the side and opening edges. In a further embodiment of the invention it is therefore provided that the circumferential cutting lines or tear-off perforation lines are designed as square cutting lines with rounded corners or polygonal cutting lines such that the perforation lines entering the side and opening edges are approximately at right angles to these.

Vorrichtungen zur Durchführung des erfindungsgemäßen Verfahrens sind Gegenstand der Ansprüche 10 bis 12.Devices for carrying out the method according to the invention are the subject of claims 10 to 12.

Ausführungsbeispiele der Erfindung werden nachstehend anhand der Zeichnung näher erläutert. In dieser zeigt

  • Fig. 1 eine perspektivische Ansicht des Beutelstapels,
  • Fig. 2 den Eckbereich eines Beutels,
  • Fig. 3 einen Schnitt durch die die Eckbereiche der Beutel stanzende Einrichtung in schematischer Darstellung,
  • Fig. 4 eine Draufsicht auf eine Kunststofffolienbahn mit einem kreisförmigen Stanz- und Perforationsschnitt,
  • Fig. 5 eine Draufsicht auf eine Kunststofffolienbahn mit einem viereckigen Stanz-und Perforationsschnitt,
  • Fig. 6 eine Draufsicht auf eine Kunststofffolienbahn mit einem achteckigen Ausstanz-und Perforationsschnitt und
  • Fig. 7 einen Schnitt durch eine zweite Ausführungsform einer die Eckbereiche der Beutel stanzenden Einrichtung.
Embodiments of the invention are explained in more detail below with reference to the drawing. In this shows
  • 1 is a perspective view of the stack of bags,
  • 2 the corner area of a bag,
  • 3 shows a section through the device punching the corner regions of the bags in a schematic illustration,
  • Fig. 4 is a plan view of a plastic sheet with a circular Punching and perforation cut,
  • 5 shows a plan view of a plastic film web with a square punching and perforation cut,
  • Fig. 6 is a plan view of a plastic sheet with an octagonal punch and perforation cut and
  • 7 shows a section through a second embodiment of a device punching the corner regions of the bags.

Der Beutelstapel 1 besteht aus gestaptelten Beuteln 2, die aus rechteckigen Kunststoffolienabschnitten durch Falten um die Bodenfaltlinie 3 auf sich selbst gebildet worden sind. Dabei enden die Öffnungskanten 4 der vorderen Wandungen im Abstand vor den Öffnungskanten 5 der hinteren Wandungen der Beutel 2, so daß an der Öffnungsseite überdeckungsfreie Streifen 6 der Rückwandung gebildet sind. Im Bereich der Öffnungsseite sind die Beutel 2 mittig in üblicher Weise mit Grifflochstanzungen 7 versehen. In den Eckbereichen der Öffnungsseiten sind die vorderen Wandungen der Beutel 2 mit etwa viertelkreisförmigen Ausstanzungen versehen, die durch die Schnittkanten 8 begrenzt sind. Die Rückwandungen sind etwa deckungsgleich mit diesen Schnittkanten mit viertelkreisförmigen Perforationslinien 9 versehen. Die durch die Perforationslinien 9 begrenzten Eckbereiche 10 der Rückwandungen sind mit Stanzlöchern 11 versehen, die dem Stapeln und/oder dem Aufhängen der gestapelten Beutel 2 dienen.The stack of bags 1 consists of stacked bags 2 which have been formed from rectangular plastic film sections by folding around the bottom fold line 3 on themselves. The opening edges 4 of the front walls end at a distance from the opening edges 5 of the rear walls of the bags 2, so that overlapping strips 6 of the rear wall are formed on the opening side. In the area of the opening side, the bags 2 are provided in the middle with grip hole punchings 7 in the usual way. In the corner regions of the opening sides, the front walls of the bags 2 are provided with approximately quarter-circular punched-outs which are delimited by the cutting edges 8. The back walls are approximately congruent with these cut edges with quarter-circle perforation lines 9. The corner regions 10 of the rear walls, delimited by the perforation lines 9, are provided with punched holes 11 which are used for stacking and / or hanging the stacked bags 2.

Aus Fig. 2 ist ersichtlich, daß die Perforationslinien 9 etwa senkrecht in die oberen Öffnungsränder und in die seitlichen Ränder einlaufen. Die Perforationslinien 9 weisen im Bereich der Öffnungsränder 5 und im Bereich der Seiten längere Materialstege 12, 13 auf. Die Materialstege 12, 13 sind durch durchgezogene Linien dargestellt. Zwischen den längeren Materialstegen 12, 13 ist ein Bereich mit kürzeren Materialstegen vorgesehen.From Fig. 2 it can be seen that the perforation lines 9 approximately perpendicular in the upper opening edges and in the lateral Shrink edges. The perforation lines 9 have longer material webs 1 2, 13 in the area of the opening edges 5 and in the area of the sides. The material webs 12, 13 are represented by solid lines. An area with shorter material webs is provided between the longer material webs 12, 13.

Die Schnittkanten 8 und die Perforationslinien 9 sind etwa deckungsgleich angeordnet. In der Zeichnung sind sie der besseren Ubersichtlichkeit halber versetzt zueinander dargestellt.The cut edges 8 and the perforation lines 9 are arranged approximately congruently. In the drawing they are shown offset from one another for the sake of clarity.

Die einzelnen Beutel 2 sind in üblicher Weise mit Seitenschweißnähten versehen.The individual bags 2 are provided in the usual way with side welds.

Zum Abriß eines Beutels 2 von dem Beutelstapel 1 wird dieser ergriffen und in Richtung des Pfeils A von dem Beutelstapel 1 abgezogen.To tear off a bag 2 from the bag stack 1, the latter is gripped and pulled off the bag stack 1 in the direction of arrow A.

Die Herstellung der Beutel wird nun anhand der Fig. 3 kurz erläutert.The manufacture of the bags will now be briefly explained with reference to FIG. 3.

Zur Herstellung der Beutel werden die Seitenteile 15, 16 einer Kunststoffolienbahn auf deren Mittelteil 17 um die Faltkanten 3 geschlagen, und zwar derart, daß die innenliegenden Seitenkanten 18, 19 im Abstand vor der Mittellinie 20 liegen. Die derart vorbereitete doppelt gefaltete Bahn 21 wird anschliessend durch einen Förderer in bekannter Weise intermittierend um jeweils einer Beutelbreite entsprechende Schritte durch die Stanzstation 22 gefördert, in der die Eckausbildungen der späteren Beutel gestanzt werden.To produce the bags, the side parts 15, 16 of a plastic film web are knocked onto the middle part 17 around the folded edges 3, in such a way that the inner side edges 18, 19 lie at a distance from the center line 20. The double-folded web 21 prepared in this way is then conveyed by a conveyor in a known manner intermittently by steps corresponding to a bag width through the punching station 22, in which the corner configurations of the later bags are punched.

Die Stanzeinrichtung besteht aus einer gestellfesten Messerplatte 23, die mit vier Stanzwerkzeugen 24 mit ringförmiger Schneide zum Stanzen der Stapel- oder Haltelöcher 11 und mit diese etwa kreisförmig einfassenden Perforationsmessern 25 versehen ist, die dem Stanzen der Perforationslinien 9 dienen. Zum Ausstanzen der Stapel- oder Aufhängelöcher 11 und der diese einfassenden, umlaufenden Perforationslinien 9 wird die Widerlagerplatte 26 auf das entsprechende Mittelteil 17 der Kunststoffolienbahn 21 abgesenkt. Die Widerlagerplatte 26 ist zu ihrer Betätigung an der Kolbenstange 28 des gestellfesten Zylinders 29 befestigt. Die Oberseite der Widerlagerplatte 26 dient als Widerlager für die ebenfalls etwa kreisförmig angeordneten Messer 30, die an der Messerplatte 31 angeordnet sind. Die Messerplatte 31 wird durch die Kolbenstangen 32, 33 von Zylindern 34, 35 betätigt, die an einer Halteplatte 36 befestigt sind, die ihrerseits auf der Kolbenstange 28 des Zylinders 29 befestigt sind.The punching device consists of a knife plate 23 which is fixed to the frame and which is provided with four punching tools 24 with an annular cutting edge for punching the stacking or holding holes 11 and with perforation knives 25 enclosing them in a circular manner is provided, which serve to punch the perforation lines 9. In order to punch out the stacking or hanging holes 11 and the circumferential perforation lines 9 enclosing them, the abutment plate 26 is lowered onto the corresponding central part 17 of the plastic film web 21. The abutment plate 26 is attached to its actuation on the piston rod 28 of the cylinder 29 fixed to the frame. The upper side of the abutment plate 26 serves as an abutment for the likewise circularly arranged knives 30 which are arranged on the knife plate 31. The knife plate 31 is actuated by the piston rods 32, 33 of cylinders 34, 35, which are fastened to a holding plate 36, which in turn are fastened on the piston rod 28 of the cylinder 29.

Der zwischen den Seitenkanten 18, 19 der Folienbahn 21 gebildete Spalt ist so breit; daß er die Kolbenstange 28 aufzunehmen vermag, so daß die Widerlagerplatte 26 zwischen das Mittelteil 17 und die eingeschlagenen Seitenteile 15, 16 der Folienbahn 21 eingefahren werden kann.The gap formed between the side edges 18, 19 of the film web 21 is so wide; that it is able to accommodate the piston rod 28, so that the abutment plate 26 can be inserted between the middle part 17 and the turned-in side parts 15, 16 of the film web 21.

Die Zylinder 29, 34, 35 sind in nicht dargestellter Weise mit Versorgungsschläuchen versehen, durch die diesen ein Druckmittelmedium, beispielsweise Öl oder Druckluft, zugeführt wird.The cylinders 29, 34, 35 are provided in a manner not shown with supply hoses through which a pressure medium, for example oil or compressed air, is supplied.

Das an der Unterseite der Messerplatte 31 angeordnete ringförmige Messer 30 stanzt die Eckausschnitte 8 in die späteren Eckbereiche der eingeschlagenen Bahnteile.The ring-shaped knife 30 arranged on the underside of the knife plate 31 punches the corner cutouts 8 into the later corner areas of the folded-in web parts.

Die Breite der die Perforationen 9 einschneidenden Messer 25 ist derart, daß der Perforationsschnitt in Querrichtung der Bahn lange Stegteile 12 und in Längsrichtung der Bahn kurze Stegteile 13 aufweist.The width of the cutters 25 which cut the perforations 9 is such that the perforation cut has long web parts 12 in the transverse direction of the web and short web parts 13 in the longitudinal direction of the web.

Von der mit den entsprechenden Eckausgestaltungen versehenen Bahn 21 werden später längs den gestrichelt eingezeichneten Querlinien 40 durch Querschweißtrennähte die einzelnen Beutel abgeschweißt. Die auf diese Weise im Bereich der Mittellinie zusam- menhängenden Doppelbeutel werden später noch durch Längsschnitte voneinander getrennt.The individual bags are later welded off from the web 21 provided with the corresponding corner configurations along the dashed cross lines 40 by cross-weld separating seams. The double bags connected in this way in the area of the center line are later separated from one another by longitudinal cuts.

Die Grifflochausstanzungen 7 können mit den Querschweißtrennnähten oder aber auch separat gestanzt werden.The finger hole punchings 7 can be punched with the cross weld separating seams or else separately.

Fig. 5 zeigt eine Draufsicht auf eine Kunststoffolienbahn 41, die in den Eckbereichen der noch zusammenhängenden Beutel mit einem viereckigen umlaufenden Perforationsstanzschnitt 42 und einem etwa deckungsgleichen Ausschnitt längs einer Schnittlinie 43 versehen ist, die im Bereich der Längsmittellinie 20 der Folienbahn durch den zwischen den Innenkanten 44, 45 der eingeschlagenen Bahnteile gebildeten Spalt unterbrochen ist.Fig. 5 shows a plan view of a plastic film sheet 41, which is provided in the corner areas of the still connected bags with a square circumferential perforation punch cut 42 and an approximately congruent cut along a cutting line 43, which in the area of the longitudinal center line 20 of the film web through the between the inner edges 44, 45 of the formed web parts gap is interrupted.

Die quadratischen Perforationsstanzschnitte und Ausschnitte weisen derart abgerundete Ecken auf, daß sie in der dargestellten Weise rechtwinkelig in die späteren Öffnungsränder und Seitenkanten der Beutel einmünden.The square perforation cuts and cutouts have rounded corners such that they open at right angles in the manner shown in the later opening edges and side edges of the bags.

Die Perforationsstanzschnitte 42 sind im Bereich der Seitenkanten und Öffnungsränder der späteren Beutel mit längeren Stegen und zwischen diesen mit kürzeren Stegen ausgeführt.The perforation cuts 42 are made in the area of the side edges and opening edges of the later bags with longer webs and between them with shorter webs.

In Fig. 4 ist eine Draufsicht auf eine Kunststoffolienbahn dargestellt, die im Bereich der Ecken der noch zusammenhängenden Beutel mit einem runden Perforationsstanzschnitt 46 und einem etwa deckungsgleichen ebenfalls runden Ausschnitt 47 versehen ist. In den dargestellten Winkelbereichen, die die späteren Öffnungsränder und Seitenkanten der Beutel einschließen, sind die Stege der Perforationsstanzschnitte jeweils 0,5 mm lang und zwischen diesen nur 0,3 mm lang ausgeführt.FIG. 4 shows a top view of a plastic film web which is provided in the area of the corners of the still connected bags with a round perforated punch cut 46 and a roughly identical, likewise round cutout 47. In the angular ranges shown, which include the later opening edges and side edges of the bags the webs of the perforation punch cuts each 0.5 mm long and only 0.3 mm long between them.

Aus Fig. 6 ist eine Draufsicht auf eine Kunststoffolienbahn ersichtlich, die im Bereich der noch zusammenhängenden Ecken der späteren Beutel mit einem achteckigen Perforationsstanzschnitt 48 und einem etwa deckungsgleichen Ausschnitt 49 versehen ist. Durch die achteckige Form der Perforationsstanzschnitte ist gewährleistet, daß diese mit relativ langen Schenkeln in die späteren Öffnungsränder und Seitenkanten der Beutel einmünden. Die auf den späteren Öffnungsrändern und Seitenkanten der Beutel etwa senkrecht stehenden Schenkel der Perforationsstanzlinien sind mit längeren Stegen ausgebildet.6 shows a plan view of a plastic film web which is provided with an octagonal perforation cut 48 and an approximately congruent cutout 49 in the area of the still connected corners of the later bags. The octagonal shape of the perforation punch cuts ensures that they open into the later opening edges and side edges of the bags with relatively long legs. The legs of the perforation punch lines, which are approximately vertical on the later opening edges and side edges of the bags, are formed with longer webs.

Anhand der Fig. 7 wird nun eine zweite Ausführungsform einer Einrichtung zum Stanzen der Eckausbildungen der späteren Beutel näher erläutert. Auf einem Träger 50 des Gestells ist eine Messerplatte 51 mit einem kreisförmigen Perforationsmesser 52 befestigt. Oberhalb dieses Perforationsmessers 52 ist an Führungsbolzen 53, 54 eine Halterung 55 für eine Widerlagerplatte .56 befestigt, die das Perforationsmesser 52 überdeckt. Die Führungsbolzen 53, 54 sind in Bohrungen einer Führungsplatte 57 des Gestells längsverschieblich geführt. Durch Druckfedern 58 ist die Widerlagerplatte 56 in ihrer oberen Lage gehalten.7, a second embodiment of a device for punching the corner formations of the later bags will now be explained in more detail. A knife plate 51 is fastened to a carrier 50 of the frame with a circular perforation knife 52. Above this perforation knife 52, a holder 55 for an abutment plate .56, which covers the perforation knife 52, is fastened to guide bolts 53, 54. The guide bolts 53, 54 are guided in the bores of a guide plate 57 of the frame so as to be longitudinally displaceable. The abutment plate 56 is held in its upper position by compression springs 58.

Oberhalb der Widerlagerplatte 56 ist ein kreisförmiges Stanzmesser 60 an der Kolbenstange 61 des Pneumatikzylinders 62 befestigt.A circular punching knife 60 is fastened to the piston rod 61 of the pneumatic cylinder 62 above the abutment plate 56.

Die Führungsbolzen 53, 54 greifen zwischen den Spalt, der zwischen den inneren Kanten der eingeschlagenen Seitenteile der Folienbahn 45 gebildet ist, so daß die Widerlagerplatte 56 zwischen dem Mittelteil und den eingeschlagenen Seitenteilen der Folienbahn 45 liegt.The guide bolts 53, 54 engage between the gap which is formed between the inner edges of the folded-in side parts of the film web 45, so that the abutment plate 56 lies between the middle part and the turned-in side parts of the film web 45.

Wird über die Kolbenstange 61 das kreisförmige Stanzmesser 60 herabgefahren, stößt dies auf die Oberseite der Widerlagerplatte 56, die durch weiteres Absenken des Stanzmessers 60 stabilisiert und mitgenommen wird, bis sie sich auf den gezackten Kranz des unteren kreisförmigen Perforationsstanzmessers 52 legt. Durch entsprechenden von dem Pneumatikzylinder 62 ausgeübten Druck erfolgen sodann die Stanzausschnitte sowie die Ausführung der umlaufenden Abrißperforationslinie.If the circular punching knife 60 is lowered via the piston rod 61, this encounters the upper side of the abutment plate 56, which is stabilized and taken away by further lowering the punching knife 60 until it lies on the serrated rim of the lower circular perforation punching knife 52. The punched cutouts and the execution of the circumferential tear perforation line are then carried out by appropriate pressure exerted by the pneumatic cylinder 62.

Nach Anheben des oberen Stanzmessers 60 hebt sich unter der Wirkung der Druckfedern auch die Widerlagerplatte 56 von dem unteren Perforationsmesser 52 ab, so daß die Bahn 45 intermittierend weiterbewegt werden kann.After lifting the upper punching knife 60, the abutment plate 56 also lifts off the lower perforation knife 52 under the action of the compression springs, so that the web 45 can be moved intermittently.

Zum Ausführen der Aufhängelöcher sind Stanzwerkzeuge 65 vorgesehen, die über eine Trägerplatte 66 an der Kolbenstange eines Pneumatikzylinders 67 befestigt sind. Die Stanzwerkzeuge 65 durchsetzen die Messerplatte 51 und die Widerlagerplatte 56 in entsprechenden Bohrungen, die zugleich auch der Führung dienen. Während der Ausführung der Stanzschnitte und Ausbildung der umlaufenden Perforationslinien werden zum Stanzen der Aufhängelöcher die Stanzwerkzeuge 65 ausgefahren und wieder zurückgeführt.Punching tools 65 are provided for executing the suspension holes and are fastened to the piston rod of a pneumatic cylinder 67 via a carrier plate 66. The punching tools 65 pass through the knife plate 51 and the abutment plate 56 in corresponding bores which also serve as guides. During the execution of the punch cuts and the formation of the circumferential perforation lines, the punch tools 65 are extended and returned to punch the hanging holes.

Claims (12)

1. Beutelstapel, bestehend aus aus rechteckigen Folienabschnitten aus thermoplastischem Kunststoff gebildeten Beuteln, die um ihre Bodenfaltkanten auf sich gefaltet, mit Seitenschweißnähten und an ihren Öffnungsseiten mit mittigen Grifflochstanzungen und seitlichen, durch Perforationslinien begrenzten Eckstükken versehen sind, die miteinander fluchtende Stapel- oder Aufhängelöcher aufweisen,
dadurch gekennzeichnet,
daß nur die Beutelrückwandung jedes Beutels (2) mit deren beiden oberen Eckbereiche begrenzenden Perforationslinien (9) versehen ist und daß die Beutelvorderwand in ihren Eckbereichen Ausschnitte aufweist, die durch etwa mit den Perforationslinien (9) deckungsgleiche Trennschnitte (8) gebildet sind.1. Stack of bags, consisting of bags made of rectangular film sections made of thermoplastic plastic, which are folded around themselves at their bottom folding edges, with side weld seams and on their opening sides with central grip hole punchings and lateral corner pieces delimited by perforation lines, which have stacking or hanging holes aligned with one another ,
characterized,
that only the back wall of the bag of each bag (2) is provided with perforation lines (9) delimiting its two upper corner areas and that the front wall of the bag has cutouts in its corner areas which are formed by approximately identical separating cuts (8) with the perforation lines (9). 2. Beutelstapel nach Anspruch 1, dadurch gekennzeichnet, daß die Perforationslinien unterschiedlich lange Stege aufweisen, wobei die Steglängen dem Kraftverlauf beim Abreißen der Beutel entlang der Perforationslinie und eventuell auch der Kurvenform der Perforationslinien in der Weise angepaßt sind, daß ein Abriß entlang der Perforationslinie gewährleistet ist.2. A stack of bags according to claim 1, characterized in that the perforation lines have webs of different lengths, the web lengths of the force curve when the bags are torn off along the perforation line and possibly also Curve shape of the perforation lines are adapted in such a way that a tear along the perforation line is guaranteed. 3. Beutelstapel nach Anspruch 1, dadurch gekennzeichnet, daß die Perforationslinien (9) in den Bereichen des Öffnungsrandes (5) und der Seitenkante eines jeden Beutels kurze Materialstege (12, 13) und zwischen diesen kürzere Materialstege aufweisen.3. A stack of bags according to claim 1, characterized in that the perforation lines (9) in the areas of the opening edge (5) and the side edge of each bag have short material webs (12, 13) and between these shorter material webs. 4. Beutelstapel nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Materialstege in ihrer Länge von den langen (12) zu den kurzen (13) hin kontinuierlich abnehmen.4. Stack of bags according to one of claims 1 to 3, characterized in that the length of the material webs continuously decrease in length from the long (12) to the short (13). 5. Beutelstapel nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Oberkante (4) der Öffnungsseite der Vorderwand jedes Beutels (2) vor der Oberkante (5) der Rückwand endet, so daß diese einen überdeckungsfreien Streifen (6) aufweist.5. Stack of bags according to one of claims 1 to 4, characterized in that the upper edge (4) of the opening side of the front wall of each bag (2) ends in front of the upper edge (5) of the rear wall, so that it has an overlap-free strip (6). 6. Beutelstapel nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Beutel (2) in dem Stapel (1) im Bereich der perforierten Ecken (10) miteinander verblockt sind.6. Stack of bags according to one of claims 1 to 5, characterized in that the bags (2) in the stack (1) in the region of the perforated corners (10) are blocked together. 7. Verfahren zur Herstellung von Beutelstapeln nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Seitenteile (15, 16) einer Kunststoffolienbahn (21) derart auf deren Mittelteil (17) umgelegt werden, daß deren Seitenkanten (18, 19) im dichten Abstand vor deren Mittelinie (20) liegen, daß die derart gefaltete Kunststoffolienbahn (21) intermittierend um jeweils eine Beutelbreite durch Stanz-und Schweißstationen gefördert wird, in denen zunächst die Eckbereiche (10) der späteren Rückwände von vier nebeneinander und paarweise spiegelbildlich zueinander liegenden Beuteln durch eine geschlossene Linie mit den Perforationslinien (9) und mit den Stapel- oder Aufhängelöchern (11) versehen, nachfolgend die Eckstanzausschnitte der späteren Beutelvorderwandungen ausgeführt, anschliessend die Grifflochausstanzungen und die die Beutelseitennähte bildenden Querschweißtrennähte oder paarweisen Querschweißnähte-mit zwischen diesen liegenden Quertrennschnitten angebracht und daß schließlich die noch paarweise zusammenhängenden Beutel durch längs der Mittellinie (20) der Kunststofffolienbahn ausgeführte Schnitte voneinander getrennt und gestapelt werden. 7. A method for producing stacks of bags according to one of claims 1 to 6, characterized in that the side parts (15, 16) of a plastic film web (21) in such a way the middle part (17) of which are folded over so that their side edges (18, 19) lie at a close distance from their center line (20), that the plastic film web (21) folded in this way is conveyed intermittently by one bag width each through punching and welding stations, in which the corner regions (10) of the later rear walls of four bags lying next to one another and in pairs in mirror image to one another are initially conveyed by a closed line with the perforation lines (9 ) and provided with the stacking or hanging holes (11), subsequently the corner punch cutouts of the later bag front walls are carried out, then the grip hole punchings and the cross weld seams forming the bag side seams or pairwise cross weld seams - with cross cuts lying between them and finally the bags, which are still connected in pairs, are separated from one another and stacked by cuts made along the center line (20) of the plastic film web. 8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß die die Abreißperforationslinien und Eckstanzschnitte bildenden Schnitte durch umlaufende kreis- oder ellipsenförmige Schnitte (46, 47) ausgeführt werden. 8 . Method according to claim 7, characterized in that the cuts forming the tear-off perforation lines and corner punch cuts are made by circumferential circular or elliptical cuts (46, 47). 9. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß die die Abreißperforationslinien und Eckstanzausschnitte bildenden Schnitte durch viereckige Schnittlinien mit abgerundeten Ecken (42, 43) oder mehreckige Schnittlinien (48, 49) ausgeführt werden und daß die in die Öffnungskanten und Seitenteile der Beutel einlaufenden Perforationslinien rechtwinkelig zu diesen stehen.9. The method according to claim 7, characterized in that the cuts forming the tear-off perforation lines and corner punch cut-outs by square cut lines with rounded corners (42, 43) or polygonal cut lines (48, 49) and that the perforation lines entering the opening edges and side parts of the bags are at right angles to them. 10. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 7, dadurch gekennzeichnet, daß die die Eckausbildungen der Beutel (2) stanzende Einrichtung (22) aus einer gestellfesten Messerplatte (23) mit kreis- oder ellipsenförmig angeordneten Perforationsmessern (25) und mit die Stapel-oder Aufhängelöcher stanzenden Messern (24) besteht, auf die eine an einer Kolbenstange (28) eines gestellfesten Zylinders (29) befestigte Widerlagerplatte (26), die zwischen das Mittelteil (17) der intermittierend geförderten Kunststoffolienbahn (21) und deren eingeschlagenen Seitenteile (15, 16) greift, absenkbar ist, und
daß die Oberseite der Widerlagerplatte (26) das Widerlager für die die viertelkreisförmigen Ausschnitte stanzende Messerplatte (31) ist, die an Kolbenstangen (32, 33) von Zylindern (34, 35) befestigt ist, die auf einem an der Kolbenstange (28) des gestellfesten Zylinders (29) befestigten Querträger (36) angeordnet sind.10. Device for performing the method according to claim 7, characterized in that the corner formations of the bags (2) punching device (22) from a frame-fixed knife plate (23) with circular or elliptical perforation knives (25) and with the stack or knives (24) punching hanging holes, onto which an abutment plate (26) fastened to a piston rod (28) of a cylinder (29) fixed to the frame, which between the middle part (17) of the intermittently conveyed plastic film web (21) and its wrapped side parts (15 , 16) engages, can be lowered, and
that the top of the abutment plate (26) is the abutment for the quarter-circular cut-out knife plate (31) which is attached to piston rods (32, 33) of cylinders (34, 35) which on a on the piston rod (28) of the frame-fixed cylinder (29) fixed cross member (36) are arranged. 11. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 7, dadurch gekennzeichnet, daß die die Eckausbildungen der gestapelten Beutel stanzende Einrichtung aus einer gestellfesten Messerplatte (51) mit einem kreis- oder ellipsenförmig ausgebildeten Perforationsmesser (52) besteht, daß oberhalb der Messerplatte (52) absenkbar und hebbar an der Kolbenstange (61) eines Druckmittelzylinders (62) ein kreis- oder ellipsenförmiges, die viertelkreisförmigen Ausschnitte stanzendes Messer (60) befestigt ist und daß zwischen dem Messer und der Perforationsmesserplatte (51,52) eine Widerlagerplatte (56) vorgesehen ist, die zwischen das Mittelteil der intermittierend geförderten Kunststoffolienbahn (45) und deren eingeschlagenen Seitenteile greift, parallel zu sich selbst verschieblich und absenkbar in dem Maschinengestell geführt und derart durch Federn (58) in ihrer oberen Stellung gehalten ist, daß sie durch das obere Messer (60) abgesenkt und gegen das Perforationsmesser (52) gedrückt wird. 11. A device for carrying out the method according to claim 7, characterized in that the corner punching of the stacked bag punching device consists of a fixed knife plate (51) with a circular or elliptical perforation knife (52), that above the knife plate (52) can be lowered and raised on the piston rod (61) of a pressure medium cylinder (62) a circular or elliptical knife (60) punching the quarter-circular cutouts is fastened and that between the knife and the perforation knife plate (51, 52) there is provided an abutment plate (56) which engages between the central part of the intermittently conveyed plastic film web (45) and its wrapped side parts, is displaceable and can be lowered parallel to itself in the machine frame and so on is held in its upper position by springs (58) that it is lowered by the upper knife (60) and pressed against the perforation knife (52). 12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß im Gestell durch einen Pneumatikzylinder (68) heb- und absenkbare, die Aufhängelöcher stanzende Messer (65) angeordnet sind, die die untere Messerplatte (51) und die Widerlagerplatte (56) in entsprechenden Führungs- und Matrizenbohrungen durchsetzen.12. The apparatus according to claim 11, characterized in that in the frame by a pneumatic cylinder (68) can be raised and lowered, the hanging holes punching knife (65) are arranged, the lower knife plate (51) and the abutment plate (56) in corresponding guide - and drill through die holes.
EP87110985A 1986-08-19 1987-07-29 Method and apparatus for the production of a stack of bags Expired - Lifetime EP0256375B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87110985T ATE57352T1 (en) 1986-08-19 1987-07-29 METHOD AND APPARATUS FOR MAKING BAGS STACKS.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3628031 1986-08-19
DE3628031 1986-08-19
DE19873700914 DE3700914A1 (en) 1986-08-19 1987-01-14 PACK OF BAGS AND METHOD AND DEVICE FOR ITS PRODUCTION
DE3700914 1987-01-14

Publications (2)

Publication Number Publication Date
EP0256375A1 true EP0256375A1 (en) 1988-02-24
EP0256375B1 EP0256375B1 (en) 1990-10-10

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EP87110985A Expired - Lifetime EP0256375B1 (en) 1986-08-19 1987-07-29 Method and apparatus for the production of a stack of bags

Country Status (7)

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US (1) US4903839A (en)
EP (1) EP0256375B1 (en)
CA (1) CA1291079C (en)
DE (1) DE3700914A1 (en)
DK (1) DK430187A (en)
FI (1) FI86396C (en)
NO (1) NO172972C (en)

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EP0369549A1 (en) * 1988-11-15 1990-05-23 Klerk's Plastic Industrie B.V. Method and apparatus for manufacturing a sleeve- or bag-like container, as well as such container
US4974968A (en) * 1988-09-19 1990-12-04 Windmoller & Holscher Bag having holes for retaining pins
CN105584714A (en) * 2016-02-22 2016-05-18 珠海市德燊环保包装有限公司 Stacked plastic bag and production method thereof
FR3070377A1 (en) * 2017-08-30 2019-03-01 Hanova PACKAGING OF ENVELOPE TYPE OR BAG
CN112455001A (en) * 2020-11-02 2021-03-09 骏业塑胶（深圳）有限公司 Binding device for plastic bags

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WO1988006092A1 (en) * 1987-02-14 1988-08-25 Stiegler Gmbh Maschinenfabrik Process for the manufacture of packs of plastic bags with side seams, said bags forming a block
US4974968A (en) * 1988-09-19 1990-12-04 Windmoller & Holscher Bag having holes for retaining pins
EP0369549A1 (en) * 1988-11-15 1990-05-23 Klerk's Plastic Industrie B.V. Method and apparatus for manufacturing a sleeve- or bag-like container, as well as such container
CN105584714A (en) * 2016-02-22 2016-05-18 珠海市德燊环保包装有限公司 Stacked plastic bag and production method thereof
FR3070377A1 (en) * 2017-08-30 2019-03-01 Hanova PACKAGING OF ENVELOPE TYPE OR BAG
CN112455001A (en) * 2020-11-02 2021-03-09 骏业塑胶（深圳）有限公司 Binding device for plastic bags
CN112455001B (en) * 2020-11-02 2022-09-09 骏业塑胶（深圳）有限公司 Binding device for plastic bags

Also Published As

Publication number Publication date
NO873474L (en) 1988-02-22
DE3700914A1 (en) 1988-02-25
FI873565A (en) 1988-02-20
EP0256375B1 (en) 1990-10-10
DE3700914C2 (en) 1990-08-30
US4903839A (en) 1990-02-27
CA1291079C (en) 1991-10-22
NO172972B (en) 1993-06-28
FI86396C (en) 1992-08-25
DK430187A (en) 1988-02-20
NO172972C (en) 1993-10-06
FI86396B (en) 1992-05-15
DK430187D0 (en) 1987-08-18
NO873474D0 (en) 1987-08-18
FI873565A0 (en) 1987-08-18

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