WO2003035500A1 - Bag made of a thermoplastic sheet - Google Patents

Bag made of a thermoplastic sheet Download PDF

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Publication number
WO2003035500A1
WO2003035500A1 PCT/EP2002/011597 EP0211597W WO03035500A1 WO 2003035500 A1 WO2003035500 A1 WO 2003035500A1 EP 0211597 W EP0211597 W EP 0211597W WO 03035500 A1 WO03035500 A1 WO 03035500A1
Authority
WO
WIPO (PCT)
Prior art keywords
front wall
bag
rear wall
drawstrings
layers
Prior art date
Application number
PCT/EP2002/011597
Other languages
German (de)
French (fr)
Inventor
Armin Meyer
Original Assignee
Lemo Maschinenbau Gmbh
Melitta Haushaltsprodukte Gmbh & Co. 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 Lemo Maschinenbau Gmbh, Melitta Haushaltsprodukte Gmbh & Co. Kg filed Critical Lemo Maschinenbau Gmbh
Publication of WO2003035500A1 publication Critical patent/WO2003035500A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/28—Strings or strip-like closures, i.e. draw closures
    • 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
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/813—Applying closures
    • B31B70/8134—Applying strings; Making string-closed bags
    • B31B70/8135—Applying strings; Making string-closed bags the strings being applied in the machine direction
    • 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
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/813—Applying closures
    • B31B70/8134—Applying strings; Making string-closed bags
    • B31B70/8137—Applying strings; Making string-closed bags the ends of the strings being attached to the side edges of the bags

Definitions

  • the invention relates to a bag made of thermoplastic plastic film with a front wall and a rear wall, which are connected to one another by side weld seams to form a filler opening and each have a double layer in the area of the filler opening, with two drawstrings extending across the bag width, one of which is between the two Layers of the front wall and the rear wall is inserted and which are welded to each other at their two ends, and with a grip hole partially exposing the drawstring for each drawstring, and a method for producing such a bag.
  • Such bags which can be closed by means of the inserted drawstring after filling, are known in many forms.
  • DE 38 21 905 describes a bag in which a drawstring is inserted in a folded-over and welded-on seam provided at the filling opening, which is also welded to the side weld seam. A grip hole in the middle of the hem allows you to grasp the drawstring.
  • DE 44 33 582-A discloses a bag and a method for its production, in which the front wall and the rear wall are each formed by an outer and inner film layer, each of which extends over the entire wall surface.
  • a drawstring extending across the bag width is inserted between the two film layers, the ends of the two drawstrings being welded to the side weld seams of the bag.
  • a grip hole partially exposed to the drawstring.
  • Such bags are often used for filling in bucket-shaped containers, for example as garbage bags in garbage cans.
  • the upper edge with the filling opening and the drawstring is usually folded over the upper edge of the container so that it is covered by the bag and the bag is kept open in the container.
  • this type of fixing the bag in the container is often inadequate.
  • the filling opening of the bag is not sufficiently held at the edge of the container during filling, so that the bag rushes into the container.
  • the invention is therefore based on the object of improving a bag of the generic type in such a way that it can be fixed to a container edge in an improved manner with simple manufacture.
  • both the front wall and the rear wall each have the end regions of the drawstrings exposing cutouts at both corners, that the two drawstrings are additionally welded to one another at least in an exposed end region at a distance from the end weld, and that the drawstrings are made of are made of an elastically stretchable material.
  • the drawstrings limit a filler opening with a reduced cross-section, which is elastically stretchable and thus enlargeable.
  • the filling edge of the bag designed in this way can be stretched elastically over the edge of a container and thus securely fixed.
  • the ends protruding from the second weld each form an exposed protruding eyelet, on which the drawstrings can be simply packed to remove the bag from the container and to close the bag.
  • Claim 3 claims an advantageous method for producing a bag according to the invention which can be carried out without additional effort compared to the production of known bags. Brief description of the drawing
  • Figure 1 is a plan view of a bag
  • Figure 2 shows a section through the area of the filling opening with the drawstrings.
  • the bag shown in the drawing is made of thermoplastic film. It consists of a front wall 1 and a rear wall 2, which are connected to one another at their edges by side welds 3, 4.
  • the bottom of the bag 1 is closed by a bottom seam 5, which is produced by longitudinal welding.
  • both the front wall 1 and the rear wall 2 are formed in two layers, as can be seen from FIG. 2.
  • a hem is either made in the area of the filling opening 6 by turning over the respective web edges, or the bag is made from four webs lying one above the other, so that the front wall 1 and the rear wall 2 are each formed as a double layer as a whole.
  • the double-layered area of the filling opening 6 is delimited by longitudinal weld seams 7, 8, which each connect the two layers of the front wall 1 and the rear wall 2.
  • longitudinal weld seams 7, 8 which each connect the two layers of the front wall 1 and the rear wall 2.
  • the two layers of the front wall 1 and the rear wall 2 are each connected together in a closed manner.
  • the front wall 1 and the rear wall 2 are each made of a half tube, the folds of which form the edge of the filler opening.
  • drawstring 9, 10 is inserted between the two layers of the front wall 1 and the rear wall 2. Both drawstrings 9, 10 extend over the entire width of the bag and are each at their ends a cross weld 11, 12 welded together so that they form a self-contained, the filler opening 6 surrounding drawstring.
  • the drawstrings 9, 10 are made of an elastically stretchable material, in particular an elastic plastic material.
  • the double-layered upper region 13, delimited by the longitudinal weld seam 7, of both the front wall 1 and the rear wall 2 has arcuate cut-outs 14, 15 at both corners, so that the end regions 16, 17 of both tension bands 9, 10 are exposed.
  • the cutouts 14, 15 form grip holes in which the ends of the drawstrings 9, 10 can be gripped.
  • the two tension bands 9, 10 are additionally welded to one another at a distance from the weld seams 11, 12 forming the final weld.
  • the additional welds 18, 19 preferably each consist of a series of welding spots arranged transversely, and a further transverse welding seam can also be provided at a distance from the welding seams 11, 12.
  • the additional welds 18, 19 shorten the drawstrings 9, 10 in their length delimiting the fill opening 6.
  • the filling opening 6 thus has a reduced cross section compared to the rest of the bag. Since the drawstrings 9, 10 are made of elastic material, the size of the filler opening 6 can be increased by expanding the drawstrings 9, 10.
  • the filling edge of the bag can thus be stretched elastically over the edge of a container and securely fixed.
  • the ends 16, 17 projecting beyond the second welds 17, 18 each form an eyelet which is exposed in the cutouts 14, 15 and on which the drawstrings 9, 10 can be easily gripped.
  • the two webs first lying on top of one another, are first fed to a processing station in which circular openings are punched into both layers in the middle of the web. The distance between the centers of two adjacent openings corresponds to the width of a bag to be produced. Then roll along the center line both above the top layer and below the bottom layer peeled strips fed through, which extend through the openings. Then the two layers are folded outwards around a central longitudinal fold, i.e.
  • the upper layer is up and the lower layer is down.
  • two half-tubes are formed, each of which has a drawstring along the longitudinal fold.
  • the circular openings are also folded into semicircles in which the drawstrings are exposed.
  • the bottom seam 5 connecting all four layers and the two longitudinal seams 7, 8 are then produced by longitudinal welding, each of which only connects the two outer layers to one another and delimits the area 13 with the tension band.
  • 4 individual bags are formed in a welding station by transverse welding to form the side seams 3, 4.
  • Double side seams 3, 4 are preferably welded, between which a perforation is provided.
  • the bags wound into rolls can be torn off individually.
  • two web layers are also processed lying one above the other.
  • the two web layers are folded in the middle in the longitudinal direction. So form four superimposed web layers with a double-layered longitudinal fold, which later forms the bottom of the bag.
  • individual bags are formed in the manner described above by cross welding to form the side seams 3, 4.
  • the two tension bands 9, 10 are welded together at their ends.
  • the additional welds 18, 19 are introduced into the exposed end regions 16, 17 in the manner described above in order to reduce the size of the filling opening 6 of the bag.
  • a half tube is expediently pulled off an unwinding roll.
  • the half tube is folded on the long side, on which the bottom of the bag is later formed.
  • the openings 14, 15 are punched in, and then the drawstrings 9, 10 are placed at a distance from the edges.
  • Each edge is then folded in each case around the inserted drawstring 9, 10 and a seam is thus formed which is welded to the respective position with a weld seam 7.
  • the associated weld seam 11, 12, which connects the two tension bands 9, 10 to one another at their ends is simultaneously produced with a side seam 3, 4 during cross welding.
  • the two tension bands 9, 10 are connected to one another in their end regions by additional welds 18, 19.

Abstract

The invention relates to a bag made of a thermoplastic sheet, comprising a front wall (1) and a back wall (2) which are interlinked through side welds (3, 4), thus forming a filling opening (6). Each of the two walls has a double layer in the region (13) of the filling opening (6). One pull band (9, 10) extending throughout the width of the bag is inserted between the two layers of the front wall (1) and another one between the two layers of the back wall (2) and both pull bands (9, 10) are welded to each other at their two ends. According to the present invention, both corners of the front wall (1) and the back wall (2) are provided with cuts (14, 15) which uncover the end regions (16, 17) of the pull bands (9, 10), thereby forming handling holes. Both pull bands (9, 10) are made of an expandable plastic material and are welded to each other at a distance from the end weld (11, 12), at least in an uncovered end region (16, 17).

Description

B E S C H R E I B U N G DESCRIPTION
Beutel aus thermoplastischer KunststoffolieBags made of thermoplastic plastic film
Technisches GebietTechnical field
Die Erfindung betrifft einen Beutel aus thermoplastischer Kunststoffolie mit einer Vorderwand und einer Rückwand, die unter Bildung einer Einfüllöffnung durch Seitenschweißnähte miteinander verbunden und jeweils im Bereich der Einfüllöffnung doppellagig ausgebildet sind, mit zwei sich über die Beutelbreite erstreckenden Zugbändern, von denen jeweils eines zwischen den beiden Lagen der Vorderwand und der Rückwand eingelegt ist und die an ihren beiden Enden miteinander verschweißt sind, und mit einem das Zugband teilweise freilegenden Griffloch für jedes Zugband, sowie ein Verfahren zur Herstellung eines derartigen Beutels.The invention relates to a bag made of thermoplastic plastic film with a front wall and a rear wall, which are connected to one another by side weld seams to form a filler opening and each have a double layer in the area of the filler opening, with two drawstrings extending across the bag width, one of which is between the two Layers of the front wall and the rear wall is inserted and which are welded to each other at their two ends, and with a grip hole partially exposing the drawstring for each drawstring, and a method for producing such a bag.
Stand der TechnikState of the art
Derartige Beutel, die mittels des eingelegten Zugbandes nach dem Befüllen verschlossen werden können, sind in vielfältiger Form bekannt. So beschreibt die DE 38 21 905 einen Beutel, bei dem jeweils ein Zugband in einem an der Einfüllöffnung vorgesehenen umgeschlagenen und angeschweißten Saum eingelegt wird, der auch mit der Seitenschweißnaht verschweißt ist. Ein Griffloch im mittleren Bereich des Saumes ermöglicht das Ergreifen des Zugbandes.Such bags, which can be closed by means of the inserted drawstring after filling, are known in many forms. For example, DE 38 21 905 describes a bag in which a drawstring is inserted in a folded-over and welded-on seam provided at the filling opening, which is also welded to the side weld seam. A grip hole in the middle of the hem allows you to grasp the drawstring.
Aus der DE 44 33 582-A ist ein Beutel und ein Verfahren zu seiner Herstellung bekannt, bei dem die Vorderwand und die Rückwand jeweils von einer äußeren und inneren Folienlage gebildet werden, die sich jeweils über die gesamte Wandfläche erstrecken. Im Bereich der Einfüllöffnung ist jeweils zwischen die beiden Folienlagen ein sich über die Beutelbreite erstreckendes Zugband eingelegt, wobei die beiden Zugbänder an ihren Enden mit den Seitenschweißnähten des Beutels verschweißt sind. Im mittleren Bereich jeder Doppellage ist jeweils ein das Zugband teilweise freiliegendes Griffloch angeordnet. Derartige Beutel werden häufig zum Befüllen in eimerförmige Behälter eingesetzt, beispielsweise als Müllbeutel in Mülleimer. Bei den bekannten Beuteln wird dabei üblicherweise der obere Rand mit der Einfüllöffnung und dem Zugband um den oberen Behälterrand umgeschlagen, damit dieser von dem Beutel abgedeckt ist und der Beutel in dem Behälter geöffnet gehalten wird. Bei den bekannten Beuteln ist diese Art der Fixierung des Beutels in dem Behälter oft unzulänglich. Die Einfüllöffnung des Beutels wird beim Befüllen nicht ausreichend am Behälterrand gehalten, so daß der Beutel in den Behälter ruscht.DE 44 33 582-A discloses a bag and a method for its production, in which the front wall and the rear wall are each formed by an outer and inner film layer, each of which extends over the entire wall surface. In the area of the filling opening, a drawstring extending across the bag width is inserted between the two film layers, the ends of the two drawstrings being welded to the side weld seams of the bag. In the middle area of each double layer there is a grip hole partially exposed to the drawstring. Such bags are often used for filling in bucket-shaped containers, for example as garbage bags in garbage cans. In the case of the known bags, the upper edge with the filling opening and the drawstring is usually folded over the upper edge of the container so that it is covered by the bag and the bag is kept open in the container. In the known bags, this type of fixing the bag in the container is often inadequate. The filling opening of the bag is not sufficiently held at the edge of the container during filling, so that the bag rushes into the container.
Darstellung der ErfindungPresentation of the invention
Der Erfindung liegt daher die Aufgabe zugrunde, einen Beutel der gattungsgemäßen Art so zu verbessern, daß er bei einfacher Fertigung verbessert an einem Behälterrand fixiert werden kann.The invention is therefore based on the object of improving a bag of the generic type in such a way that it can be fixed to a container edge in an improved manner with simple manufacture.
Diese Aufgabe wird dadurch gelöst, daß sowohl die Vorderwand als auch die Rückwand an beiden Ecken jeweils die Endbereiche der Zugbänder freilegende Ausstanzungen aufweist, daß die beiden Zugbänder zumindest in einem freigelegten Endbereich mit Abstand von der Endverschweißung zusätzlich miteinander verschweißt sind, und daß die Zugbänder aus einem elastisch dehnbaren Material hergestellt sind.This object is achieved in that both the front wall and the rear wall each have the end regions of the drawstrings exposing cutouts at both corners, that the two drawstrings are additionally welded to one another at least in an exposed end region at a distance from the end weld, and that the drawstrings are made of are made of an elastically stretchable material.
Durch die zweite Verschweißung begrenzen die Zugbänder eine Einfüllöffnung mit verringertem Querschnitt, die elastisch dehnbar und somit vergrößerbar ist. Der so gestaltete Einfüllrand des Beutels läßt sich elastisch gespannt über den Rand eines Behälters ziehen und so sicher fixieren. Die über die zweite Schweißung überstehenden Enden bilden jeweils eine freiliegend hervorstehende Öse, an der die Zugbänder zum Entnehmen des Beutels aus dem Behälter und zum Verschließen des Beutels einfach gepackt werden können.Due to the second welding, the drawstrings limit a filler opening with a reduced cross-section, which is elastically stretchable and thus enlargeable. The filling edge of the bag designed in this way can be stretched elastically over the edge of a container and thus securely fixed. The ends protruding from the second weld each form an exposed protruding eyelet, on which the drawstrings can be simply packed to remove the bag from the container and to close the bag.
Der Patentanspruch 3 beansprucht ein vorteilhaftes, da gegenüber der Herstellung von bekannten Beuteln ohne Mehraufwand durchführbares Verfahren zur Herstellung eines erfindungsgemäßen Beutels. Kurze Beschreibung der ZeichnungClaim 3 claims an advantageous method for producing a bag according to the invention which can be carried out without additional effort compared to the production of known bags. Brief description of the drawing
In der Zeichnung ist eine bevorzugte Ausführungsform eines erfindungsgemäßen Beutels dargestellt.In the drawing, a preferred embodiment of a bag according to the invention is shown.
Es zeigenShow it
Figur 1 die Draufsicht auf einen Beutel undFigure 1 is a plan view of a bag and
Figur 2 einen Schnitt durch den Bereich der Einfüllöffnung mit den Zugbändern.Figure 2 shows a section through the area of the filling opening with the drawstrings.
Wege zur Ausführung der ErfindungWays of Carrying Out the Invention
Der in der Zeichnung dargestellte Beutel wird aus thermoplastischer Kunststoffolie hergestellt. Er besteht aus einer Vorderwand 1 und einer Rückwand 2, die durch Seitenschweißnähte 3, 4 an ihren Rändern miteinander verbunden sind. Der Boden des Beutels 1 ist von einer Bodennaht 5 verschlossen, die durch Längsschweißen hergestellt wird. Zumindest im Bereich der Einfüllöffnung 6 sind sowohl die Vorderwand 1 als auch die Rückwand 2 doppellagig ausgebildet, wie aus Figur 2 hervorgeht. Dazu wird entweder im Bereich der Einfüllöffnung 6 durch Umschlagen der jeweiligen Bahnränder ein Saum hergestellt, oder der Beutel wird aus vier übereinander liegenden Bahnen hergestellt, so daß die Vorderwand 1 und die Rückwand 2 jeweils als gesamtes doppellagig ausgebildet sind. Der doppellagig gestaltete Bereich der Einfüllöffnung 6 wird durch Längsschweiß-nähte 7, 8 begrenzt, die jeweils die beiden Lagen der Vorderwand 1 und der Rückwand 2 miteinander verbinden. Am Rand der Einfüllöffnung 6 sind die beiden Lagen der Vorderwand 1 und der Rückwand 2 jeweils geschlossen miteinander verbunden. Dies wird dadurch erreicht, daß die Vorderwand 1 und die Rückwand 2 jeweils aus einem Halbschlauch hergestellt werden, deren Faltungen den Rand der Einfüllöffnung bilden. Alternativ ist es möglich, die beiden Lagen der Vorderwand 1 und der Rückwand 2 am Rand der Einfüllöffnung 6 mit einer Längsschweißnaht miteinander zu verschweißen.The bag shown in the drawing is made of thermoplastic film. It consists of a front wall 1 and a rear wall 2, which are connected to one another at their edges by side welds 3, 4. The bottom of the bag 1 is closed by a bottom seam 5, which is produced by longitudinal welding. At least in the area of the filling opening 6, both the front wall 1 and the rear wall 2 are formed in two layers, as can be seen from FIG. 2. For this purpose, a hem is either made in the area of the filling opening 6 by turning over the respective web edges, or the bag is made from four webs lying one above the other, so that the front wall 1 and the rear wall 2 are each formed as a double layer as a whole. The double-layered area of the filling opening 6 is delimited by longitudinal weld seams 7, 8, which each connect the two layers of the front wall 1 and the rear wall 2. At the edge of the filling opening 6, the two layers of the front wall 1 and the rear wall 2 are each connected together in a closed manner. This is achieved in that the front wall 1 and the rear wall 2 are each made of a half tube, the folds of which form the edge of the filler opening. Alternatively, it is possible to weld the two layers of the front wall 1 and the rear wall 2 to one another at the edge of the filling opening 6 using a longitudinal weld seam.
Im Bereich der Einfüllöffnung 6 ist zwischen die beiden Lagen der Vorderwand 1 und der Rückwand 2 jeweils ein Zugband 9, 10 eingelegt. Beide Zugbänder 9, 10 erstrecken sich über die gesamte Beutelbreite und sind an ihren Enden jeweils durch eine Querschweißnaht 11 , 12 miteinander verschweißt, so daß sie ein in sich geschlossenes, die Einfüllöffnung 6 umlaufendes Zugband bilden. Die Zugbänder 9, 10 sind aus einem elastisch dehnbaren Material, insbesondere aus einem elastischen Kunststoff material, hergestellt.In the area of the filling opening 6, a drawstring 9, 10 is inserted between the two layers of the front wall 1 and the rear wall 2. Both drawstrings 9, 10 extend over the entire width of the bag and are each at their ends a cross weld 11, 12 welded together so that they form a self-contained, the filler opening 6 surrounding drawstring. The drawstrings 9, 10 are made of an elastically stretchable material, in particular an elastic plastic material.
Der doppellagige, durch die Längsschweißnaht 7 begrenzte obere Bereich 13 sowohl der Vorderwand 1 als auch der Rückwand 2 weist an beiden Ecken jeweils bogenförmige Ausstanzungen 14, 15 auf, so daß die Endbereiche 16, 17 beider Zugbänder 9, 10 freiliegen. Die Ausstanzungen 14, 15 bilden Grifflöcher, in denen die Enden der Zugbänder 9, 10 ergriffen werden können. Zumindest in einem, bevorzugt in beiden freigelegten Endbereichen 16, 17, sind die beiden Zugbänder 9, 10 mit Abstand von den die Endverschweißung bildenden Schweißnähten 11 , 12 zusätzlich miteinander ver-schweißt. Bevorzugt bestehen die zusätzlichen Verschweißungen 18, 19 jeweils aus einer Reihe von querverlaufend angeordneten Schweißpunkten, ebenso kann jeweils eine weitere Querschweißnaht mit Abstand von den Schweißnähten 11 , 12 angebracht werden.The double-layered upper region 13, delimited by the longitudinal weld seam 7, of both the front wall 1 and the rear wall 2 has arcuate cut-outs 14, 15 at both corners, so that the end regions 16, 17 of both tension bands 9, 10 are exposed. The cutouts 14, 15 form grip holes in which the ends of the drawstrings 9, 10 can be gripped. At least in one, preferably in both exposed end regions 16, 17, the two tension bands 9, 10 are additionally welded to one another at a distance from the weld seams 11, 12 forming the final weld. The additional welds 18, 19 preferably each consist of a series of welding spots arranged transversely, and a further transverse welding seam can also be provided at a distance from the welding seams 11, 12.
Durch die zusätzlichen Verschweißungen 18, 19 werden die Zugbänder 9, 10 in ihrer die Einfüllöffnung 6 begrenzenden Länge verkürzt. Die Einfüllöffnung 6 erhält so einen gegenüber dem restlichen Beutel verringerten Querschnitt. Da die Zugbänder 9, 10 aus elastischem Material sind, läßt sich Größe der Einfüllöffnung 6 durch Dehnung der Zugbänder 9, 10 vergrößern. Der Einfüllrand des Beutels kann so elastisch gespannt über den Rand eines Behälters gezogen und sicher fixiert werden. Die über die zweite Schweißungen 17, 18 überstehenden Enden 16, 17 bilden jeweils eine in den Ausstanzungen 14, 15 freiliegende Öse, an der die Zugbänder 9, 10 einfach ergriffen werden können.The additional welds 18, 19 shorten the drawstrings 9, 10 in their length delimiting the fill opening 6. The filling opening 6 thus has a reduced cross section compared to the rest of the bag. Since the drawstrings 9, 10 are made of elastic material, the size of the filler opening 6 can be increased by expanding the drawstrings 9, 10. The filling edge of the bag can thus be stretched elastically over the edge of a container and securely fixed. The ends 16, 17 projecting beyond the second welds 17, 18 each form an eyelet which is exposed in the cutouts 14, 15 and on which the drawstrings 9, 10 can be easily gripped.
Bei der Herstellung von Beuteln, deren gesamte Vorderwand 1 und Rückwand 2 doppellagig ausgebildet ist, werden nach einer Variante zwei Bahnlagen mit einer Breite von zwei Abwickelrollen abgezogen, die der doppelten Beutellänge (= Abstand Bodennaht 5 - Rand der Einfüllöffnung 6) entspricht. Die beiden Bahnen werden sich deckend übereinander liegend zunächst einer Bearbeitungsstation zugeführt, in der in der Mitte der Bahn kreisförmige Öffnungen in beide Lagen eingestanzt werden. Der Abstand der Mittelpunkte zweier benachbarter Öffnungen voneinander entspricht dabei der Breite eines herzustellenden Beutels. Anschließend werden entlang der Mittellinie sowohl oberhalb der obersten Lage als auch unterhalb der untersten Lage von Rollen abgezogene Bänder zugeführt, die sich durch die Öffnungen erstrecken. Danach werden die beiden Lagen um eine mittig verlaufende Längsfalz jeweils nach außen gefaltet, also die obere Lage nach oben und die untere Lage nach unten. Es werden so zwei Halbschläuche gebildet, bei denen entlang der Längsfaltung jeweils ein Zugband eingelegt ist. Dabei werden auch die kreisförmigen Öffnungen zu Halbkreisen gefaltet, in denen die Zugbänder frei liegen. Anschließend wird durch Längsschweißen die alle vier Lagen miteinander verbindende Bodennaht 5 und die beiden Längsnähte 7, 8 hergestellt, die jeweils nur die beiden äußeren Lagen miteinander verbinden und den Bereich 13 mit dem Zugband begrenzen. Im Anschluß daran werden in einer Schweißstation durch Querschweißen unter Bildung der Seitennähte 3, 4 einzelne Beutel gebildet. Bevorzugt werden doppelte Seitennähte 3, 4 geschweißt, zwischen denen eine Perforation angebracht ist. Die zu Rollen aufgewickelten Beutel können so einzeln abgerissen werden. Bei dem Querschweißen der Seitennähte 3, 4 werden zugleich die Querschweißnähte 11 , 12 in den Zugbändern hergestellt und so auch die Zugbänder 9, 10 eines Beutels abgetrennt. Es ist ein großer Vorteil des erfindungsgemäßen Verfahrens, daß mit nur einem sich über die Länge des Beutels erstreckenden Schweißwerkzeug, beispielsweise einem Schweißbalken, gleichzeitig und ohne zusätzlichen Aufwand zugleich die Enden der Zugbänder 9, 10 miteinander verschweißt werden, die aufgrund der Ausstanzungen 14, 15 frei liegen. Gleichzeitig mit den Schweißnähten 3, 11 bzw. 4, 12 werden in der taktweise betriebenen Schweißstation mit getrennten Schweißwerkzeugen die Zugbänder 9, 10 durch zusätzliche Schweißungen 18 bzw. 19 miteinander verbunden. Die zusätzlichen Schweißungen 18, 19 verlaufen jeweils mit Abstand von den Endschweißnähten 11 , 12 innerhalb des durch die Ausstanzungen 14, 15 freigelegten Bereichs.In the production of bags, the entire front wall 1 and rear wall 2 of which are double-layered, two web layers with a width of two unwinding rolls are deducted, which corresponds to twice the length of the bag (= distance from the bottom seam 5 to the edge of the filling opening 6). The two webs, first lying on top of one another, are first fed to a processing station in which circular openings are punched into both layers in the middle of the web. The distance between the centers of two adjacent openings corresponds to the width of a bag to be produced. Then roll along the center line both above the top layer and below the bottom layer peeled strips fed through, which extend through the openings. Then the two layers are folded outwards around a central longitudinal fold, i.e. the upper layer is up and the lower layer is down. In this way, two half-tubes are formed, each of which has a drawstring along the longitudinal fold. The circular openings are also folded into semicircles in which the drawstrings are exposed. The bottom seam 5 connecting all four layers and the two longitudinal seams 7, 8 are then produced by longitudinal welding, each of which only connects the two outer layers to one another and delimits the area 13 with the tension band. Subsequently, 4 individual bags are formed in a welding station by transverse welding to form the side seams 3, 4. Double side seams 3, 4 are preferably welded, between which a perforation is provided. The bags wound into rolls can be torn off individually. When the side seams 3, 4 are cross-welded, the cross-weld seams 11, 12 are simultaneously produced in the drawstrings, and the drawstrings 9, 10 of a bag are also cut off in this way. It is a great advantage of the method according to the invention that with only one welding tool, for example a welding bar, which extends over the length of the bag, the ends of the drawstrings 9, 10 are welded to one another at the same time and without additional effort, which ends due to the punched-outs 14, 15 lie free. Simultaneously with the weld seams 3, 11 and 4, 12, in the pulsed welding station with separate welding tools, the drawstrings 9, 10 are connected to one another by additional welds 18 and 19. The additional welds 18, 19 each run at a distance from the end welds 11, 12 within the area exposed by the punched-outs 14, 15.
Anschließend werden die noch durch Stege zwischen den Perforationen verbundenen einzelnen Beutel zu Rollen aufgewickelt. Dabei ist es von großem Vorteil, daß auch die Zugbänder 9, 10 zweier benachbarter Beutel nur durch eine Perforation voneinander getrennt, also noch durch Stege miteinander verbunden sind. Die Beutel sind so noch über ihre gesamte Länge miteinander verbunden und können problemlos zu Rollen aufgewickelt werden.The individual bags still connected by webs between the perforations are then wound up into rolls. It is of great advantage that the drawstrings 9, 10 of two adjacent bags are only separated from one another by a perforation, that is to say they are still connected to one another by webs. The bags are still connected to each other over their entire length and can be easily wound up into rolls.
Nach einer anderen Ausführungsform werden ebenfalls zwei Bahnlagen übereinander liegend verarbeitet. Die beiden Bahnlagen werden in Längsrichtung mittig gefaltet. So bilden sich vier übereinander liegende Bahnlagen mit einer doppellagigen Längsfalz, die später den Boden der Beutel bildet.According to another embodiment, two web layers are also processed lying one above the other. The two web layers are folded in the middle in the longitudinal direction. So form four superimposed web layers with a double-layered longitudinal fold, which later forms the bottom of the bag.
Anschließend werden an der zur Längsfalz entgegengesetzten Seite in regelmäßigen Abständen halbkreisförmige Ausstanzungen 14, 15 durch alle vier Lagen eingebracht. Danach werden in dem Bereich 13 jeweils zwischen die beiden oberen und unteren Lagen in Längsrichtung verlaufende, elastisch dehnbare Bänder 9, 10 eingelegt. Nach dem Einlegen der beiden Zugbänder 9, 10 werden jeweils die beiden Bahnlagen der Vorderwand 1 und der Rückwand 2 durch Längsschweißen einer Kopfnaht geschlossen und miteinander verbunden. Die dabei erstellten Kopfnähte begrenzen die Öffnung 6 des Beutels.Subsequently, on the side opposite to the longitudinal fold, semicircular punchings 14, 15 are made through all four layers at regular intervals. Thereafter, elastically stretchable bands 9, 10 are inserted in the area 13 between the two upper and lower layers in the longitudinal direction. After inserting the two drawstrings 9, 10, the two web layers of the front wall 1 and the rear wall 2 are closed by longitudinal welding of a head seam and connected to each other. The head seams created thereby limit the opening 6 of the bag.
Zum Abschluß werden auf die vorstehend beschriebene Weise durch Querschweißen unter Bildung der Seitennähte 3, 4 einzelne Beutel gebildet. Bei dem Querschweißen werden gleichzeitig die beiden Zugbänder 9, 10 an ihren Enden miteinander verschweißt. Ebenso werden auf die vorstehend beschriebene Weise in die freiliegenden Endbereiche 16, 17 die zusätzlichen Schweißungen 18, 19 eingebracht, um die Größe der Einfüll-öffnung 6 des Beutels zu verringern.Finally, individual bags are formed in the manner described above by cross welding to form the side seams 3, 4. In the cross welding, the two tension bands 9, 10 are welded together at their ends. Likewise, the additional welds 18, 19 are introduced into the exposed end regions 16, 17 in the manner described above in order to reduce the size of the filling opening 6 of the bag.
Zur Herstellung von Beuteln, deren Vorderwand 1 und Rückwand 2 jeweils nur im Bereich 13 der Einfüllöffnung 6 doppellagig ausgebildet sind, so wird zweckmäßiger Weise ein Halbschlauch von einer Abwickelrolle abgezogen. Der Halbschlauch ist an der Längsseite gefaltet, an der später der Boden der Beutel gebildet wird. An der anderen Längsseite werden jeweils die Öffnungen 14, 15 eingestanzt und anschließend die Zugbänder 9, 10 mit Abstand von den Rändern jeweils aufgelegt. Anschließend wird jeder Rand jeweils um das eingelegte Zugband 9, 10 gefaltet und so ein Saum gebildet, der an der jeweiligen Lage mit einer Schweißnaht 7 festgeschweißt wird. Auch bei diesem Verfahren wird beim Querschweißen gleichzeitig mit einer Seitennaht 3, 4 die zugehörige Schweißnaht 11 , 12 hergestellt, die die beiden Zugbänder 9, 10 an ihren Enden miteinander verbindet. Ebenso werden die beiden Zugbänder 9, 10 in ihren Endbereichen durch zusätzliche Schweißungen 18, 19 miteinander verbunden. For the production of bags, the front wall 1 and the rear wall 2 of which are each double-layered only in the region 13 of the filling opening 6, a half tube is expediently pulled off an unwinding roll. The half tube is folded on the long side, on which the bottom of the bag is later formed. On the other long side, the openings 14, 15 are punched in, and then the drawstrings 9, 10 are placed at a distance from the edges. Each edge is then folded in each case around the inserted drawstring 9, 10 and a seam is thus formed which is welded to the respective position with a weld seam 7. In this method, too, the associated weld seam 11, 12, which connects the two tension bands 9, 10 to one another at their ends, is simultaneously produced with a side seam 3, 4 during cross welding. Likewise, the two tension bands 9, 10 are connected to one another in their end regions by additional welds 18, 19.

Claims

P A T E N T A N S P R Ü C H E PATENT CLAIMS
1.1.
Beutel aus thermoplastischer Kunststoffolie mit einer Vorderwand (1 ) und einer Rückwand (2), die unter Bildung einer Einfüllöffnung (6) durch Seitenschweißnähte (3, 4) miteinander verbunden und jeweils im Bereich (13) der Einfüllöffnung (6) doppellagig aus-gebildet sind, mit zwei sich über die Beutelbreite erstreckenden Zugbändern (9, 10), von denen jeweils eines zwischen den beiden Lagen der Vorderwand (1) und der Rückwand (2) eingelegt ist und die an ihren beiden Enden miteinander verschweißt sind, und mit einem das Zugband (9, 10) teilweise freilegenden Griffloch für jedes Zugband (9, 10), dadurch gekennzeichnet, daß sowohl die Vorderwand (1) als auch die Rückwand (2) an beiden Ecken jeweils die Endbereiche (16, 17) der Zugbänder (9, 10) freilegende Aus-stanzungen (14, 15) aufweisen, daß die beiden Zugbänder (9, 10) zumindest in einem freigelegten Endbereich (16, 17) mit Abstand von der Endverschweißung (11 , 12) zusätz-lich miteinander verschweißt sind, und daß die Zugbänder (9, 10) aus einem elastisch dehnbaren Material hergestellt sind.Bags made of thermoplastic film with a front wall (1) and a rear wall (2), which are connected to each other to form a filling opening (6) by side weld seams (3, 4) and each have a double layer in the area (13) of the filling opening (6) are, with two drawstrings (9, 10) extending across the bag width, one of which is inserted between the two layers of the front wall (1) and the rear wall (2) and which are welded together at their two ends, and with one the pull strap (9, 10) partially exposing the grip hole for each pull strap (9, 10), characterized in that both the front wall (1) and the rear wall (2) have the end regions (16, 17) of the pull straps (16) at both corners. 9, 10) exposing cut-outs (14, 15) have that the two tension bands (9, 10) are additionally welded to one another at least in an exposed end region (16, 17) at a distance from the end weld (11, 12) , and since the drawstrings are made (9, 10) made of an elastically stretchable material.
2.Second
Beutel nach Anspruch 1 , dadurch gekennzeichnet, daß an beiden Ecken der Vorderwand (1) und der Rückwand (2) jeweils bogenförmige Ausstanzungen (14, 15) vorhanden sind.Bag according to claim 1, characterized in that arcuate punch-outs (14, 15) are provided at both corners of the front wall (1) and the rear wall (2).
3.Third
Verfahren zur Herstellung eines Beutels gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß in die Bahnlagen, von denen die Vorderwände (1) und Rückwände (2) gebildet werden, zunächst Öffnungen eingestanzt werden, anschließend für die Vorder-wand (1) und die Rückwand (2) jeweils ein sich durch die Öffnungen erstreckendes Zugband (9, 10) eingelegt wird, danach durch Querschweißen die Seitennähte (3, 4) hergestellt und zugleich die Enden der Zugbänder (9, 10) miteinander verschweißt werden, und daß die beiden Zugbänder (9, 10) zumindest in einem freigelegten Endbereich (16, 17) mit Abstand von einer die Enden verbindenden Schweißnaht (11 , 12) zusätzlich miteinander verschweißt werden. A process for producing a bag according to claim 1 or 2, characterized in that openings are first punched into the web layers from which the front walls (1) and rear walls (2) are formed, then for the front wall (1) and the Rear wall (2) is inserted through the openings extending tension band (9, 10), then the side seams (3, 4) are produced by cross welding and at the same time the ends of the tension bands (9, 10) are welded together, and that the two Tension bands (9, 10) are additionally welded to one another at least in an exposed end region (16, 17) at a distance from a weld seam (11, 12) connecting the ends.
PCT/EP2002/011597 2001-10-24 2002-10-17 Bag made of a thermoplastic sheet WO2003035500A1 (en)

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DE10151843A DE10151843A1 (en) 2001-10-24 2001-10-24 Bags made of thermoplastic plastic film

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FR2858807A1 (en) * 2003-08-13 2005-02-18 Sp Metal Bag for carrying domestic wastes, has two sides, each with lap having elastic draw chord, and welded along partial welding lines extending from corresponding lateral edges on longitudinal extension corresponding to that of recesses
FR2858808A1 (en) 2003-08-13 2005-02-18 Sp Metal Garbage sack with sliding ties in upper edge sleeve has one tie of elastic material and other non-elastic
FR2858809A1 (en) 2003-08-13 2005-02-18 Sp Metal Garbage sack has upper edge sleeves with sliding elastic ties and additional non-elastic ties for more reliable fastening to receptacle
FR2859459A1 (en) 2003-09-10 2005-03-11 Sp Metal Domestic filth and waste storage bag, has weld line whose top ends define length lower than length between lateral borders and line, so that elastic strip undergoes lengthening to maintain bag on top edge of receptacle
FR2859982A1 (en) 2003-09-24 2005-03-25 Sp Metal Bag for storing municipal solid waste, has elastic band extending on entire width of bag and connected to one side by connection zones, where one zone forms intermediate zone situated at distance from lateral ends
EP2239204A1 (en) 2009-04-09 2010-10-13 Papier-Mettler - Inh. Michael Mettler Plastic film bag and bag stack containing a number of these plastic film bag stacks

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DE10218720B3 (en) * 2002-04-26 2004-02-05 Lemo Maschinenbau Gmbh Drawstring pouch with adhesive strips
DE102004022845A1 (en) * 2004-05-08 2005-12-01 Lemo Maschinenbau Gmbh Method of making drawstring bags with stretchable drawstring
DE202008017131U1 (en) 2008-12-19 2010-04-29 W. Pelz Gmbh & Co. Kg bag
DE202017002607U1 (en) 2017-05-08 2017-05-30 Quickpack Haushalt + Hygiene Gmbh Plastic packaging bag
US10618698B1 (en) 2019-02-06 2020-04-14 Poly-America, L.P. Elastic drawstring trash bag

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2858807A1 (en) * 2003-08-13 2005-02-18 Sp Metal Bag for carrying domestic wastes, has two sides, each with lap having elastic draw chord, and welded along partial welding lines extending from corresponding lateral edges on longitudinal extension corresponding to that of recesses
FR2858808A1 (en) 2003-08-13 2005-02-18 Sp Metal Garbage sack with sliding ties in upper edge sleeve has one tie of elastic material and other non-elastic
FR2858809A1 (en) 2003-08-13 2005-02-18 Sp Metal Garbage sack has upper edge sleeves with sliding elastic ties and additional non-elastic ties for more reliable fastening to receptacle
FR2859459A1 (en) 2003-09-10 2005-03-11 Sp Metal Domestic filth and waste storage bag, has weld line whose top ends define length lower than length between lateral borders and line, so that elastic strip undergoes lengthening to maintain bag on top edge of receptacle
FR2859982A1 (en) 2003-09-24 2005-03-25 Sp Metal Bag for storing municipal solid waste, has elastic band extending on entire width of bag and connected to one side by connection zones, where one zone forms intermediate zone situated at distance from lateral ends
EP2239204A1 (en) 2009-04-09 2010-10-13 Papier-Mettler - Inh. Michael Mettler Plastic film bag and bag stack containing a number of these plastic film bag stacks

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