EP1228857B1 - Method of making gusseted bags from plastic sheet - Google Patents

Method of making gusseted bags from plastic sheet Download PDF

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Publication number
EP1228857B1
EP1228857B1 EP01129808A EP01129808A EP1228857B1 EP 1228857 B1 EP1228857 B1 EP 1228857B1 EP 01129808 A EP01129808 A EP 01129808A EP 01129808 A EP01129808 A EP 01129808A EP 1228857 B1 EP1228857 B1 EP 1228857B1
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EP
European Patent Office
Prior art keywords
gussets
front wall
plastic
staggered
web
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.)
Expired - Lifetime
Application number
EP01129808A
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German (de)
French (fr)
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EP1228857A3 (en
EP1228857A2 (en
Inventor
Uwe Köhn
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
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Windmoeller and Hoelscher KG
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Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP1228857A2 publication Critical patent/EP1228857A2/en
Publication of EP1228857A3 publication Critical patent/EP1228857A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
    • 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
    • B31B70/004—Closing bags

Definitions

  • the invention relates to a method for producing gusseted bags a flat plastic tubular film web section.
  • Gusseted plastic bags for example of polyolefinic films such as PE and PP, thereby become flat Plastic tubular film web sections made that these at one end with a transverse weld seam covering all layers be provided. Due to the usually high weight of the product and the resulting burden on the bags will be this usually made of extra thick plastic films.
  • Hose sections of such thick plastic films can be the floors only by transverse welds attach, for their execution long Welding times are needed.
  • welding it is necessary to heat through all film layers, in the area of the gussets so by four Foil layers to pass through to the required melting and To ensure welding.
  • Such a welding process is for example from US 5,529,396. In this case, the hose section is even through welded around him a paper tube section. Because of this bathleitreaes, with increasing film thickness and Number of layers increases, resulting in a significantly long welding time, so that the bags can be produced only with low power.
  • CA 875,950 A proposes a method in which a Plastic tubular film web portion is used, whose one end in the way a staggered cut or a staggered tear along one Perforation has that in plan view of the staggering the rear wall the Front wall surmounted.
  • the proposed method is staggering down to the area of a fold line that extends in the area of the cut Edge of the front wall is provided with an adhesive application and the Graduation folded around the folding edge on the front wall.
  • the object of the invention is therefore to provide a method of the initially stated Art suggest, after the gusseted bags made of plastic film on easy way to make at high speed.
  • this object is achieved in that the Perforation lines at the distance of the lengths of the Plastic Schlauchfolienbahnabête to a flat lying plastic sheet be attached before this by overlapping the impact Web pages under inserting the gussets and attaching a longitudinal center seam is added to a gusseted tube web.
  • an adhesive for bonding the staggered graduation to the front wall can be plastic adhesive, such as Polyuretankleber or Hotmelt, use.
  • Gluing can be improved by further subdividing the staggering become.
  • the gussets and the gussets overhang the front wall.
  • the graduation can also capture the gussets in such a way that the lower layers of the gussets project beyond the upper layers of the gussets.
  • Fig. 1 is a provided with a gusseted flat lying Plastic tubular film web torn off along a perforation line Plastic hose film web section 1 can be seen, wherein the Plastic tubular film web in the manner of one with gradations provided perforation line was that the apparent from Fig. 1 Staggering results.
  • the staggering of the layers at the end of the tubular film web section, on the bottom is to be formed, is formed in such a way that in plan view on the tubular film web section 1, the rear wall 2, the gussets. 3 surmounted, while the gussets with an appropriate free cut project over the front wall 4 provided.
  • the perforation line along which Schlauchfolienbahnabêt of the tubular film web to form the Graduation is demolished, is already in a flat tubular film web attached, from then through each other overlapping wrapping of the side panels by inserting the gussets and attaching a longitudinal center seam, the tubular film web is formed.
  • the staggered layers 2, 3 with a appropriate adhesive application and the staggering is then around the line 5 folded and pressed against the front wall 4, so that the of Fig. 2 apparent glued ground results.
  • the upper layer of Gussets provided with a Staffelexcellent along the dashed lines in Fig. 1 lines is.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Seitenfaltensäcken aus einem flachliegenden Kunststoffschlauchfolienbahnabschnitt.The invention relates to a method for producing gusseted bags a flat plastic tubular film web section.

Seitenfaltensäcke aus Kunststoff, beispielsweise aus polyolefinischen Folien wie PE und PP, werden dadurch aus flachliegenden Kunststoffschlauchfolienbahnabschnitten hergestellt, dass diese an einem Ende mit einer sämtliche Lagen erfassenden querverlaufenden Schweißnaht versehen werden. Aufgrund des üblicherweise hohen Gewichts des Füllguts und der sich daraus ergebenden Belastung für die Säcke werden diese üblicherweise aus besonders dicken Kunststofffolien hergestellt. An Schlauchabschnitten aus derart dicken Kunststofffolien lassen sich die Böden nur durch Querschweißnähte anbringen, für deren Ausführung lange Schweißzeiten benötigt werden. Beim Schweißen ist es erforderlich, die Wärme durch sämtliche Folienlagen, im Bereich der Seitenfalten also durch vier Folienlagen, hindurchzuleiten, um das erforderliche Aufschmelzen und Verschweißen sicherzustellen. Ein solches Schweißverfahren ist beispielsweise aus der US 5,529,396 bekannt. Hierbei wird der Schlauchabschnitt sogar durch einen ihn umgebenden Papierschlauchabschnitt hindurch verschweißt. Aufgrund dieses Wärmeleitprozesses, der mit wachsender Foliendicke und Anzahl der Lagen zunimmt, ergibt sich eine erheblich lange Schweißdauer, so dass sich die Säcke nur mit geringer Leistung herstellen lassen.Gusseted plastic bags, for example of polyolefinic films such as PE and PP, thereby become flat Plastic tubular film web sections made that these at one end with a transverse weld seam covering all layers be provided. Due to the usually high weight of the product and the resulting burden on the bags will be this usually made of extra thick plastic films. At Hose sections of such thick plastic films can be the floors only by transverse welds attach, for their execution long Welding times are needed. When welding, it is necessary to heat through all film layers, in the area of the gussets so by four Foil layers to pass through to the required melting and To ensure welding. Such a welding process is for example from US 5,529,396. In this case, the hose section is even through welded around him a paper tube section. Because of this Wärmeleitprozesses, with increasing film thickness and Number of layers increases, resulting in a significantly long welding time, so that the bags can be produced only with low power.

Zur Herstellung derartiger Kunststoffschlauchfolienbahnabschnitte schlägt die US 4,008,850 A vor, eine flach liegende Kunststoffbahn zunächst zu Bahnstücken zu vereinzeln, die dann, um später Enden mit Staffelungen zu erhalten, gemäß einem entsprechenden Schnittmuster beschnitten werden. Bei diesen Staffelungen überragt die Rückwand die Vorderwand. Anschließend werden die Bahnstücke jeweils zu Schlauchstücken zusammenlegt. Die Rückwand der Staffelung wird nunmehr auf die Vorderwand umgelegt und mit dieser verbunden.For the production of such Kunststoffschlauchfolienbahnabschnitte proposes the US 4,008,850 A before, a flat-lying plastic sheet to first To isolate pieces of track, which then to later ends with graduations to be trimmed according to a corresponding pattern. at In these graduations, the back wall towers over the front wall. Subsequently the web pieces are each folded into pieces of hose. The Rear wall of the staggering is now transferred to the front wall and with this connected.

Die CA 875,950 A schlägt ein Verfahren vor, bei dem ein Kunststoffschlauchfolienbahnabschnitt verwendet wird, dessen eines Ende in der Weise einen gestaffelten Schnitt oder einen gestaffelten Abriss längs einer Perforation aufweist, dass in Draufsicht auf die Staffelung die Rückwand die Vorderwand überragt. Bei dem vorgeschlagenen Verfahren wird die Staffelung bis in den Bereich einer Faltlinie, die sich im Bereich der freigeschnittenen Kante der Vorderwand befindet, mit einem Klebstoffauftrag versehen und die Staffelung um die Faltkante auf die Vorderwand umgelegt.CA 875,950 A proposes a method in which a Plastic tubular film web portion is used, whose one end in the way a staggered cut or a staggered tear along one Perforation has that in plan view of the staggering the rear wall the Front wall surmounted. The proposed method is staggering down to the area of a fold line that extends in the area of the cut Edge of the front wall is provided with an adhesive application and the Graduation folded around the folding edge on the front wall.

Das aus dem Stand der Technik bekannte Herstellen von Schlauchstücken mit Staffelungen ist sehr aufwändig, da jedes Bahn- oder Schlauchstück einzeln einer entsprechenden Vorrichtung zugeführt werden muss, so dass sich Seitenfaltensäcke auf diese Weise nach wie vor nur mit geringer Leistung herstellen lassen.The known from the prior art producing hose pieces with Graduations is very complex, since each piece of track or hose individually a corresponding device must be supplied so that Gusseted bags in this way still low performance let produce.

Aufgabe der Erfindung ist es daher, ein Verfahren der eingangs angegebenen Art vorzuschlagen, nach dem sich Seitenfaltensäcke aus Kunststofffolie auf einfache Weise mit großer Geschwindigkeit herstellen lassen.The object of the invention is therefore to provide a method of the initially stated Art suggest, after the gusseted bags made of plastic film on easy way to make at high speed.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass die Perforationslinien im Abstand der Längen der Kunststoffschlauchfolienbahnabschnitte an eine flach liegende Kunststoffbahn angebracht werden, bevor diese durch überlappendes Einschlagen der Bahnseiten unter Einlegen der Seitenfalten und Anbringen einer längsverlaufenden Mittelnaht zu einer Seitenfaltenschlauchbahn zugelegt wird. According to the invention, this object is achieved in that the Perforation lines at the distance of the lengths of the Plastic Schlauchfolienbahnabschnitte to a flat lying plastic sheet be attached before this by overlapping the impact Web pages under inserting the gussets and attaching a longitudinal center seam is added to a gusseted tube web.

Als Klebstoff zum Verkleben der umgelegten Staffelung mit der Vorderwand lassen sich Kunststoffkleber, beispielsweise Polyuretankleber oder auch Hotmelt, verwenden.As an adhesive for bonding the staggered graduation to the front wall can be plastic adhesive, such as Polyuretankleber or Hotmelt, use.

Die Verklebung kann durch eine weitere Unterteilung der Staffelung verbessert werden. Zweckmäßigerweise überragt in der Draufsicht auf die Staffelung die Rückwand die Seitenfalten und die Seitenfalten überragen die Vorderwand.Gluing can be improved by further subdividing the staggering become. Conveniently, in the plan view of the staggered over Back wall the gussets and the gussets overhang the front wall.

Die Staffelung kann auch die Seitenfalten in der Weise erfassen, dass die unteren Lagen der Seitenfalten die oberen Lagen der Seitenfalten überragen.The graduation can also capture the gussets in such a way that the lower layers of the gussets project beyond the upper layers of the gussets.

Nach einer bevorzugten Ausführungsform ist vorgesehen, dass die Perforationslinien, ausgehend von dem die Rückwand bildenden Teil, in Stufen über die die Seitenfalten bildenden Teile zu den die Vorderwand bildenden Teile verlaufen, wobei die querverlaufenden Abschnitte der Perforationslinie parallel zueinander sind. Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert. In dieser zeigt

Fig. 1
eine perspektivische Ansicht eines mit einem Staffelabriss versehenen Endes eines mit Seitenfalten versehenen flachliegenden Kunststoffschlauchfolienbahnabschnitts,
Fig. 2
eine Draufsicht auf einen durch Verkleben gebildeten Boden eines Seitenfaltensacks aus Kunststoff und
Fig. 3
einen Schnitt längs der Linie III-III durch den Sack nach Fig. 2 in vergrößerter Darstellung.
According to a preferred embodiment, it is provided that the perforation lines, starting from the rear wall forming part, extend in stages over the parts forming the side folds to the parts forming the front wall, the transverse sections of the perforation line being parallel to each other. An embodiment of the invention will be explained below with reference to the drawing. In this shows
Fig. 1
3 is a perspective view of a staggered end of a gusseted flat-faced plastic tubing sheet section;
Fig. 2
a plan view of a bottom formed by bonding a gusseted plastic bag and
Fig. 3
a section along the line III-III through the bag of FIG. 2 in an enlarged view.

Aus Fig. 1 ist ein von einer mit Seitenfalten versehenen flachliegenden Kunststoffschlauchfolienbahn längs einer Perforationslinie abgerissener Kunststoffschlauchfolienbahnabschnitt 1 ersichtlich, wobei die Kunststoffschlauchfolienbahn in der Weise mit einer mit Abstufungen versehenen Perforationslinie versehen war, daß sich die aus Fig. 1 ersichtliche Staffelung ergibt. From Fig. 1 is a provided with a gusseted flat lying Plastic tubular film web torn off along a perforation line Plastic hose film web section 1 can be seen, wherein the Plastic tubular film web in the manner of one with gradations provided perforation line was that the apparent from Fig. 1 Staggering results.

Die Staffelung der Lagen an dem Ende des Schlauchfolienbahnabschnitts, an dem der Boden anzuformen ist, ist in der Weise ausgebildet, daß in Draufsicht auf den Schlauchfolienbahnabschnitt 1 die Rückwand 2 die Seitenfalten 3 überragt, während die Seitenfalten die mit einem entsprechenden Freischnitt versehene Vorderwand 4 überragen. Die Perforationslinie, längs der der Schlauchfolienbahnabschnitt von der Schlauchfolienbahn zur Bildung der Staffelung abgerissen wird, wird bereits in eine flache Schlauchfolienbahn angebracht, aus der sodann durch einander überlappendes Einschlagen der Seitenteile unter Einlegen der Seitenfalten und Anbringen einer längsverlaufenden Mittelnaht die Schlauchfolienbahn gebildet wird.The staggering of the layers at the end of the tubular film web section, on the bottom is to be formed, is formed in such a way that in plan view on the tubular film web section 1, the rear wall 2, the gussets. 3 surmounted, while the gussets with an appropriate free cut project over the front wall 4 provided. The perforation line along which Schlauchfolienbahnabschnitt of the tubular film web to form the Graduation is demolished, is already in a flat tubular film web attached, from then through each other overlapping wrapping of the side panels by inserting the gussets and attaching a longitudinal center seam, the tubular film web is formed.

Zur Herstellung der Seitenfaltensäcke werden die gestaffelten Lagen 2, 3 mit einem geeigneten Klebstoffauftrag versehen und die Staffelung wird sodann um die Linie 5 umgelegt und gegen die Vorderwand 4 angedrückt, so daß sich der aus Fig. 2 ersichtliche geklebte Boden ergibt.To produce the gusseted bags, the staggered layers 2, 3 with a appropriate adhesive application and the staggering is then around the line 5 folded and pressed against the front wall 4, so that the of Fig. 2 apparent glued ground results.

Die Lage der Staffelungen in dem fertiggestellten geklebten Seitenfaltensack ist aus Fig. 3 ersichtlich.The location of the graduations in the finished glued gusseted bag is off Fig. 3 can be seen.

Nach einer anderen Ausführungsform ist vorgesehen, daß auch die obere Lage der Seitenfalten mit einem Staffelschnitt längs den in Fig. 1 gestrichelten Linien versehen ist.According to another embodiment, it is provided that the upper layer of Gussets provided with a Staffelschnitt along the dashed lines in Fig. 1 lines is.

Claims (4)

  1. Method of producing side-gusset bags from a laid-flat tubular plastic-film web portion (1) provided with gussets,
    one end of the tubular plastic-film web portion (1) having a staggered cut or a staggered tear along a perforation such that, in plan view of the staggered formation, the rear wall (2) projects beyond the front wall (4), and
    the staggered formation being provided, into the region of a folding line (5) located in the region of the cut-out edge of the front wall (4), with an application of adhesive and the staggered formation being folded over about the folding edge (5) onto the front wall (4),
    characterized in that the perforation lines are provided on a laid-flat plastic web at intervals equal to the lengths of the tubular plastic-film web portions (1) before this plastic web is formed into a tubular gusseted web by overlapping folding in of the web sides with incorporation of the gussets (3) and provision of a longitudinally running centre seam.
  2. Method according to Claim 1, characterized in that, in a plan view of the staggered formation, the rear wall (2) projects beyond the gussets (3) and the gussets (3) project beyond the front wall.
  3. Method according to Claim 1 or 2, characterized in that, in the staggered formation, the bottom layers of the gussets (3) project beyond the top layers of the gussets (3).
  4. Method according to one of the preceding claims, characteried in that the perforation lines, starting from the part which forms the rear wall (4), run in steps via the parts which form the gussets (3) to the parts which form the front wall (4), and the transversely running portions of the stepped perforation line are parallel to one another.
EP01129808A 2001-02-06 2001-12-14 Method of making gusseted bags from plastic sheet Expired - Lifetime EP1228857B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10106289 2001-02-06
DE10106289A DE10106289A1 (en) 2001-02-06 2001-02-06 Process for making gusseted bags from plastic film

Publications (3)

Publication Number Publication Date
EP1228857A2 EP1228857A2 (en) 2002-08-07
EP1228857A3 EP1228857A3 (en) 2003-04-09
EP1228857B1 true EP1228857B1 (en) 2005-04-13

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EP01129808A Expired - Lifetime EP1228857B1 (en) 2001-02-06 2001-12-14 Method of making gusseted bags from plastic sheet

Country Status (3)

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US (1) US6800051B2 (en)
EP (1) EP1228857B1 (en)
DE (2) DE10106289A1 (en)

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EP1228857A3 (en) 2003-04-09
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DE50105898D1 (en) 2005-05-19
US20020107128A1 (en) 2002-08-08
US6800051B2 (en) 2004-10-05

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