EP0121041B1 - Side fold bag with an upholding outer bag and a liner bag, and method for its production - Google Patents

Side fold bag with an upholding outer bag and a liner bag, and method for its production Download PDF

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Publication number
EP0121041B1
EP0121041B1 EP84100594A EP84100594A EP0121041B1 EP 0121041 B1 EP0121041 B1 EP 0121041B1 EP 84100594 A EP84100594 A EP 84100594A EP 84100594 A EP84100594 A EP 84100594A EP 0121041 B1 EP0121041 B1 EP 0121041B1
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EP
European Patent Office
Prior art keywords
sack
seam
web
perforation
cuts
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
Application number
EP84100594A
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German (de)
French (fr)
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EP0121041A3 (en
EP0121041A2 (en
Inventor
Karl Pausch
Friedrich Dr. Kratzert
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.)
NIEDERMAYR PAPIERWARENFABRIK AG
Original Assignee
NIEDERMAYR PAPIERWARENFABRIK AG
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Publication date
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Priority to AT84100594T priority Critical patent/ATE26670T1/en
Publication of EP0121041A2 publication Critical patent/EP0121041A2/en
Publication of EP0121041A3 publication Critical patent/EP0121041A3/en
Application granted granted Critical
Publication of EP0121041B1 publication Critical patent/EP0121041B1/en
Expired legal-status Critical Current

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    • 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
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • B31B70/266—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement involving gusset-forming
    • 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
    • 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
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
    • B31B2170/204—Construction of flexible containers having multi-layered walls, e.g. laminated or lined involving folding a web about an already tubular web

Definitions

  • the invention relates to a gusseted bag according to the preamble of claim 1 and a method for its production according to the preamble of claim 3.
  • the bottom is then closed that the lower end of the tube section forming the outer sack with the staggered closure flap is folded around a bottom fold, which also includes the inner sack above the transverse weld seam, and glued to the adjacent sack wall, apart from the fact that the manufacturing process is complicated and does not permit simple, continuous manufacture of the sacks , the cross-weld seam of the inner bag, which is also included in the bottom seam of the outer sack, prevents a good bottom formation, whereby in addition, leaks can occur in the cross-weld seam forming the bottom seam of the inner sack, in that area four layers of the gussets and only two layers in the middle area are welded together. Finally the inner bag undesired voltage peaks can occur in the field of e s with the Aussenla welded gusset.
  • a gusseted bag according to the preamble of claim 1 and a method for its production according to the preamble of claim 3 is known from US-PS 39 29 275.
  • the inner bag to the forming in the outer bag Block bottom can gu t and tension to nestle during filling, because the bottom portion of the inner bag is not connected to the bottom of the outer bag and can therefore move without coercion and spread.
  • the known gusseted bag with the transverse weld seam of the inner bag detached from the bottom of the outer bag can only be produced if, before the bottom of the outer bag is formed, the end of the inner bag provided with the bottom weld seam is removed from the bottom area of the outer bag, which, according to US Pat.
  • PS 3929275 described method can be done by folding the bottom area of the inner bag or by pulling back the bottom area, for example by mechanical fingers, a blown air jet or suction.
  • the known method is complicated and time-consuming due to the need to have to remove the bottom weld seam of the inner sack from the bottom region of the outer sack by additional work steps, so that it leads to an increase in the cost of the sacks with reduced performance.
  • the object of the invention is therefore to provide a gusseted bag according to the preamble of the claim, which can be produced in a simple manner.
  • the bottom of the inner bag of the side gusset bag according to the invention can be designed to be tension-free, since the separating cuts or the perforation lines destroyed during filling ensure that the side areas of the bottom of the inner bag are tension-free in the critical areas of the side gussets of the outer bag.
  • the inner bag between the separating cuts or easily destructible perforation lines can be provided with a perforation line that can be torn when the inner bag is removed from the outer bag for the purpose of emptying it, as is the case with a flat bag, but does not have the problems of tension-free bottom formation exist, is known from DE-OS 24 62 828.
  • the gusseted sack according to the invention can be produced in a particularly simple manner, since it is not necessary to take special measures to prevent the bottom weld seam of the inner sack from being included in the bottom formation of the outer sack.
  • an inner tube web 1 is applied to the still open material web 2 forming the outer sack in such a way that the edges 6 of the wrapped ones Cover the inner tube sheet 1 provided with edge areas with the later outer fold edges of the material sheet 2.
  • the outer edge regions of the inner tube web 1 can already be folded over by 180 ° on the upper or lower side of the film tube 1 when it is placed on the web 2, as can be seen from FIGS. 2 and 3.
  • the inner tube sheet 1 can, however, also be laid flat and provided only with bottom weld seams 3, introduced into the tube forming device and folded over there together with the material sheet forming the outer bag. In this case, the arrangement shown in FIG. 2 results.
  • the folded-in side areas of the inner tube sheet 1 are provided with incisions 5. These lateral incisions 5 can be made symmetrically to the later folding edge 6 in the inner tube sheet 1 which is still lying flat.
  • perforation lines 7 are provided parallel to the incisions in the manner shown in FIG. 5.
  • the incisions 5 can be connected to one another by a perforation line 10 in the manner shown in FIG. 5.
  • the perforation line is then torn when the inner bag is removed.
  • the sections are separated by tearing them off.
  • the web passes through two pairs of rollers 8 and 9 in the manner shown in FIG. 6, of which the pair of rollers 9 rotates at a greater peripheral speed than the peripheral speed of the pair of rollers 8 and the web speed. If the upper roller of the roller pair 9 is lowered onto the roller below it, the web experiences a jerky acceleration at this point, which leads to tearing of the perforation lines. If a tube section now has two perforation lines at a short distance from one another, namely lines 10 and perforation lines 7 located between the incisions 5, both lines are detected and the desired type of separation is not possible.
  • the leading hose section is already accelerated when the web section at the level of the incisions 5 is just before the line of contact of the rollers.
  • the perforation line 10 must have already passed the line of contact of the pair of rollers 9 when the tear occurs.
  • a film side gusseted tube can of course also be used, as is shown in FIG. 6.
  • the bottom weld seam is passed through four layers after inserting the side folds in the side fold area, so that the embodiment in which the side folds take place after the bottom weld seam is formed is preferred.

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  • Making Paper Articles (AREA)
  • Bag Frames (AREA)

Description

Die Erfindung betrifft einen Seitenfaltensack nach dem Oberbegriff des Patentanspruches 1 sowie ein Verfahren zu seiner Herstellung nach dem Oberbegriff des Patentanspruches 3.The invention relates to a gusseted bag according to the preamble of claim 1 and a method for its production according to the preamble of claim 3.

Bei einem aus der DE-OS30 46 036 bekannten Verfahren zur Herstellung eines Seitenfaltensakkes mit tragendem Aussensack und einem Innensack aus thermoplastischer Kunststoffolie, dessen bodenseitiges Ende durch eine Querschweissnaht geschlossen ist, wird von einem mehrlagigen, den Aussensack bildenden Schlauchabschnitt mit gestaffelter Verschlussklappe ausgegangen, der den in Seitenfalten gelegten, den Innensack bildenden Schlauchfolienabschnitt einfasst. Zur Bildung des Bodens wird die gestaffelte Verschlussklappe des den Aussensack bildenden Schlauch= abschnitts weggeklappt und die Bodennaht des" Innensackes wird durch einen Infrarot-Strahler gebildet, mit dem die bodenseitigen Schnittkanten des Folienschlauchabschnitts bis zu ihrem Verschweissen bestrahlt werden. Anschliessend wird der Boden dadurch geschlossen, dass das untere Ende des den Aussensack bildenden Schlauchabschnitts mit der gestaffelten Verschlussklappe um einen Bodenfalz, der den Innensack oberhalb der Querschweissnaht miterfasst, umgelegt und mit der angrenzenden Sackwandung verklebt wird. Abgesehen davon, dass das Herstellungsverfahren kompliziert ist und keine einfachontinuierliche Herstellung der Säcke erlaubt, verhindert die von der Bodennaht des Aussensacks miterfasste Querschweissnaht des Innensackes eine gute Bodenausbildung, wobei zusätzlich in der die Bodennaht des Innensacks bildenden Querschweissnaht dadurch Undichtigkeiten auftreten können, dass im Bereich der Seitenfalten vier Lagen und in dem mittleren Bereich nur zwei Lagen miteinander verschweisst werden. Schliesslich können auch in dem Bereich der mit den Aussenlagen verschweissten Seitenfalte des Innensackes unerwünschte Spannungsspitzen auftreten.In a method known from DE-OS30 46 036 for producing a gusseted sack with a carrying outer sack and an inner sack made of thermoplastic plastic film, the bottom end of which is closed by a transverse weld seam, a multi-layer tube section forming the outer sack with a staggered closure flap is assumed, which the encloses tubular film section laid in side folds and forming the inner bag. To form the bottom, the staggered closure flap of the tube section forming the outer sack is folded away and the bottom seam of the "inner sack is formed by an infrared radiator, with which the bottom cut edges of the film tube section are irradiated until they are sealed. The bottom is then closed that the lower end of the tube section forming the outer sack with the staggered closure flap is folded around a bottom fold, which also includes the inner sack above the transverse weld seam, and glued to the adjacent sack wall, apart from the fact that the manufacturing process is complicated and does not permit simple, continuous manufacture of the sacks , the cross-weld seam of the inner bag, which is also included in the bottom seam of the outer sack, prevents a good bottom formation, whereby in addition, leaks can occur in the cross-weld seam forming the bottom seam of the inner sack, in that area four layers of the gussets and only two layers in the middle area are welded together. Finally the inner bag undesired voltage peaks can occur in the field of e s with the Aussenla welded gusset.

Ein Seitenfaltensack nach dem Oberbegriff des Patentanspruchs 1 sowie ein Verfahren zu seiner Herstellung nach dem Oberbegriff des Patentanspruchs 3 ist aus der US-PS 39 29 275 bekannt. Bei diesem bekannten Seitenfaltensack vermag sich beim Befüllen der Innensack an den sich im Aussensack ausbildenden Blockboden gut und spannungsfrei anzuschmiegen, weil der Bodenbereich des Innensackes nicht mit dem Boden des Aussensackes verbunden ist und sich daher ohne Zwängung bewegen und ausbreiten kann. Der bekannte Seitenfaltensack mit von dem Boden des Aussensackes gelöster Querschweissnaht des Innensackes lässt sich jedoch nur herstellen, wenn vor der Bildung des Bodens des Aussensackes das mit der Bodenschweissnaht versehene Ende des Innensackes aus dem Bodenbereich des Aussensackes entfernt wird, was nach dem in der US-PS 3929275 beschriebenen Verfahren durch Umfalten des Bodenbereichs des Innensackes oder durch Zurückziehen des Bodenbereichs beispielsweise durch mechanische Finger, einen Blasluftstrahl oder Sauger geschehen kann. Das bekannte Verfahren ist durch die Notwendigkeit, die Bodenschweissnaht des Innensackes aus dem Bodenbereich des Aussensackes durch zusätzliche Arbeitsschritte entfernen zu müssen, kompliziert und aufwendig, so dass es bei verringerter Leistungsfähigkeit zu einer Verteuerung der Säcke führt.A gusseted bag according to the preamble of claim 1 and a method for its production according to the preamble of claim 3 is known from US-PS 39 29 275. In this known gusseted bag, the inner bag to the forming in the outer bag Block bottom can gu t and tension to nestle during filling, because the bottom portion of the inner bag is not connected to the bottom of the outer bag and can therefore move without coercion and spread. However, the known gusseted bag with the transverse weld seam of the inner bag detached from the bottom of the outer bag can only be produced if, before the bottom of the outer bag is formed, the end of the inner bag provided with the bottom weld seam is removed from the bottom area of the outer bag, which, according to US Pat. PS 3929275 described method can be done by folding the bottom area of the inner bag or by pulling back the bottom area, for example by mechanical fingers, a blown air jet or suction. The known method is complicated and time-consuming due to the need to have to remove the bottom weld seam of the inner sack from the bottom region of the outer sack by additional work steps, so that it leads to an increase in the cost of the sacks with reduced performance.

Aufgabe der Erfindung ist es daher, einen Seitenfaltensack nach dem Oberbegriff des Patentanspruchs zu schaffen, der sich in einfacher Weise herstellen lässt.The object of the invention is therefore to provide a gusseted bag according to the preamble of the claim, which can be produced in a simple manner.

Erfindungsgemäss wird diese Aufgabe durch die in dem kennzeichnenden Teil des Patentanspruches 1 angegebenen Merkmale gelöst.According to the invention, this object is achieved by the features specified in the characterizing part of patent claim 1.

Bei einer Befüllung kann sich der Boden des Innensackes des erfindungsgemässen Seitenfaltensackes spannungsfrei ausbilden, da die Trennschnitte oder die beim Befüllen zerstörten Perforationslinien in den kritischen Bereichen der Seitenfalten des Aussensackes ein spannungsfreies Anlegen der Seitenbereiche des Bodens des Innensackes gewährleisten.When filling, the bottom of the inner bag of the side gusset bag according to the invention can be designed to be tension-free, since the separating cuts or the perforation lines destroyed during filling ensure that the side areas of the bottom of the inner bag are tension-free in the critical areas of the side gussets of the outer bag.

Zusätzlich kann der Innensack zwischen den Trennschnitten oder leicht zerstörbaren Perforationslinien mit einer Perforationslinie versehen sein, die sich zerreissen lässt, wenn der Innensack zum Zwecke seiner Entleerung aus dem Aussensack herausgenommen wird, wie es bei einem Flachsack, bei dem allerdings nicht die Probleme einer spannungsfreien Bodenausbildung bestehen, an sich aus der DE-OS 24 62 828 bekannt ist.In addition, the inner bag between the separating cuts or easily destructible perforation lines can be provided with a perforation line that can be torn when the inner bag is removed from the outer bag for the purpose of emptying it, as is the case with a flat bag, but does not have the problems of tension-free bottom formation exist, is known from DE-OS 24 62 828.

Der erfindungsgemässe Seitenfaltensack lässt sich in besonders einfacher Weise herstellen, da es nicht erforderlich ist, besondere Massnahmen zu treffen, um zu verhindern, dass die Bodenschweissnaht des Innensackes mit in die Bodenausbildung des Aussensackes einbezogen wird.The gusseted sack according to the invention can be produced in a particularly simple manner, since it is not necessary to take special measures to prevent the bottom weld seam of the inner sack from being included in the bottom formation of the outer sack.

Weitere vorteilhafte Ausgestaltungen des erfindungsgemässen Verfahrens sind in den Unteransprüchen angegeben worden.Further advantageous refinements of the method according to the invention have been specified in the subclaims.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert. I n dieser zeigt

  • Fig. 1 eine schematische Darstellung der Vorgänge während der Bildung einer Schlauchbahn aus der die Aussensäcke bildenden Materialbahn unter Einlegen der die Innensäcke bildenden Innenschlauchbahn und des Abtrennens der der Sackherstellung dienenden Schlauchabschnitte von der Schlauchbahn,
  • Fig. 2 bis 4 Querschnitte durch flachliegende Säcke mit eingelegten Innensäcken,
  • Fig. 5 eine Draufsicht auf die die Innensäcke bildende Innenschlauchbahn mit Querschweissnähten, querverlaufenden Perforationslinien und Trennschnitten und
  • Fig. 6 eine schematische Darstellung der Trennstation einer Schlauchziehmaschine.
An embodiment of the invention is explained below with reference to the drawing. I n this shows
  • 1 is a schematic representation of the processes during the formation of a tubular web from the material web forming the outer sacks by inserting the inner tubular web forming the inner sacks and the separation of the tube sections serving to produce the sack from the tubular web,
  • 2 to 4 cross-sections through flat-lying bags with inserted inner bags,
  • Fig. 5 is a plan view of the inner tube forming the inner bags with transverse weld seams, transverse perforation lines and separating cuts and
  • Fig. 6 is a schematic representation of the separation station of a tube drawing machine.

Wie aus Fig. 1 ersichtlich ist, wird eine Innenschlauchbahn 1 auf die noch offene, den Aussensack bildende Materialbahn 2 so aufgebracht, dass sich die Kanten 6 der mit eingeschlagenen Randbereichen versehenen Innenschlauchbahn 1 mit den späteren äusseren Faltkanten der Materialbahn 2 decken. Die äusseren Randbereiche der Innenschlauchbahn 1 können bereits beim Auflegen auf die Bahn 2 um 180° auf die Ober- oder Unterseite des Folienschlauches 1 umgefaltet sein, wie es aus den Fig. 2 und 3 ersichtlich ist. Die Innenschlauchbahn 1 kann jedoch auch flachgelegt und nur mit Bodenschweissnähten 3 versehen in die Schlauchbildeeinrichtung mit eingeführt und dort zusammen mit der den Aussensack bildenden Materialbahn umgefaltet werden. In diesem Fall ergibt sich die aus Fig. 2 ersichtliche Anordnung.As can be seen from FIG. 1, an inner tube web 1 is applied to the still open material web 2 forming the outer sack in such a way that the edges 6 of the wrapped ones Cover the inner tube sheet 1 provided with edge areas with the later outer fold edges of the material sheet 2. The outer edge regions of the inner tube web 1 can already be folded over by 180 ° on the upper or lower side of the film tube 1 when it is placed on the web 2, as can be seen from FIGS. 2 and 3. The inner tube sheet 1 can, however, also be laid flat and provided only with bottom weld seams 3, introduced into the tube forming device and folded over there together with the material sheet forming the outer bag. In this case, the arrangement shown in FIG. 2 results.

Wie aus Fig. 1 ersichtlich ist, werden die eingefalteten Seitenbereiche der Innenschlauchbahn 1 mit Einschnitten 5 versehen. Diese seitlichen Einschnitte 5 können in der noch flachliegenden Innenschlauchbahn 1 symmetrisch zur späteren Umfaltkante 6 angebracht werden.As can be seen from FIG. 1, the folded-in side areas of the inner tube sheet 1 are provided with incisions 5. These lateral incisions 5 can be made symmetrically to the later folding edge 6 in the inner tube sheet 1 which is still lying flat.

Werden die Sackabschnitte nicht durch Messerschnitte, wie es beispielsweise für genähte Säcke der Fall ist, sondern durch Abreissen abgetrennt, werden parallel zu den Einschnitten in der aus Fig. 5 ersichtlichen Weise Perforationslinien 7 vorgesehen.If the sack sections are not separated by knife cuts, as is the case for sewn sacks, but by tearing, perforation lines 7 are provided parallel to the incisions in the manner shown in FIG. 5.

Um den Innensack zum Zwecke des Entleerens aus dem Aussensack herausnehmen zu können, können die Einschnitte 5 in der aus Fig. 5 ersichtlichen Weise durch eine Perforationslinie 10 miteinander verbunden werden. Bei der Entnahme des Innensackes wird sodann die Perforationslinie durchgerissen.In order to be able to remove the inner bag from the outer bag for the purpose of emptying, the incisions 5 can be connected to one another by a perforation line 10 in the manner shown in FIG. 5. The perforation line is then torn when the inner bag is removed.

Werden Seitenfaltensäcke mit geklebtem Boden hergestellt, erfolgt das Abtrennen der Abschnitte durch Abreissen. Beim üblichen Abtrennvorgang durchläuft die Bahn in der aus Fig. 6 ersichtlichen Weise zwei Walzenpaare 8 und 9, von denen das Walzenpaar 9 mit grösserer Umfangsgeschwindigkeit umläuft als es der Umfangsgeschwindigkeit des Walzenpaares 8 und der Bahngeschwindigkeit entspricht. Wird die obere Walze des Walzenpaares 9 auf die darunter befindliche Walze abgesenkt, erfährt die Bahn an dieser Stelle eine ruckartige Beschleunigung, die zum Durchreissen der Perforationslinien führt. Weist nun ein Schlauchabschnitt im geringen Abstand voneinander zwei Perforationslinien, nämlich zwischen den Einschnitten 5 befindliche Linien 10 und Perforationslinien 7, auf, so werden beide Linien erfasst und die gewünschte Art der Trennung ist nicht möglich. Es muss daher derart vorgegangen werden, dass die Beschleunigung des vorauseilenden Schlauchabschnittes bereits erfolgt, wenn das Bahnstück in Höhe der Einschnitte 5 sich gerade noch vor der Berührungslinie der Walzen befindet. Bei umgekehrter Bahnrichtung gilt dies entsprechend. In diesem Fall muss die Perforationslinie 10 bereits die Berührungslinie des Walzenpaares 9 passiert haben, wenn der Abriss erfolgt. Um bei dieser Verfahrensweise ein störungsfreies Arbeiten sicherzustellen, kann es zweckmässig sein, den Abstand zwischen den Einschnitten 5 bzw. der Perforationslinie 10 einerseits und der Perforationslinie 7 andererseits zu vergrössern. Wird die vorgenommene Abstandsvergrösserung durch eine entsprechende Abschnittsverlängerung in einer Z-Falte kompensiert, so kann der Folieninnenschlauch beim Befüllen wieder so weit nach unten rutschen, dass die Querschweissnaht 3 unmittelbar über der Bodenverschlussnaht oder der Umfaltkante a-a liegt.If gusseted bags with glued bottoms are produced, the sections are separated by tearing them off. In the usual severing process, the web passes through two pairs of rollers 8 and 9 in the manner shown in FIG. 6, of which the pair of rollers 9 rotates at a greater peripheral speed than the peripheral speed of the pair of rollers 8 and the web speed. If the upper roller of the roller pair 9 is lowered onto the roller below it, the web experiences a jerky acceleration at this point, which leads to tearing of the perforation lines. If a tube section now has two perforation lines at a short distance from one another, namely lines 10 and perforation lines 7 located between the incisions 5, both lines are detected and the desired type of separation is not possible. It is therefore necessary to proceed in such a way that the leading hose section is already accelerated when the web section at the level of the incisions 5 is just before the line of contact of the rollers. In the opposite direction, this applies accordingly. In this case, the perforation line 10 must have already passed the line of contact of the pair of rollers 9 when the tear occurs. In order to ensure trouble-free working with this procedure, it may be expedient to increase the distance between the incisions 5 or the perforation line 10 on the one hand and the perforation line 7 on the other hand. If the increase in distance made is compensated for by a corresponding section extension in a Z fold, the inner film tube can slide down again so far during filling that the transverse weld seam 3 lies directly above the bottom closure seam or the folding edge a-a.

Anstelle eines Flachschlauchs als Folieninnenlage, bei dem die Seitenbereiche auf die beiden Seitenflächen umgefaltet sind, kann selbstverständlich auch ein Folienseitenfaltenschlauch eingesetzt werden, wie er in Fig. 6 dargestellt ist. Bei einem derartigen Innenschlauch wird die Bodenschweissnaht jedoch nach Einlegen der Seitenfalten im Seitenfaltenbereich durch vier Lagen hindurchgeführt, so dass der Ausführungsform, bei der die seitlichen Umfaltungen nach Bilden der Bodenschweissnaht erfolgen, der Vorzug zu geben ist.Instead of a flat tube as a film inner layer, in which the side areas are folded over onto the two side surfaces, a film side gusseted tube can of course also be used, as is shown in FIG. 6. In the case of such an inner tube, however, the bottom weld seam is passed through four layers after inserting the side folds in the side fold area, so that the embodiment in which the side folds take place after the bottom weld seam is formed is preferred.

Claims (8)

1. A side gusseted sack comprising a load-carrying outer sack (2) which preferably consists of single-ply or multy-ply paper and is closed at its bottom by a bottom seam, which includes also the side gussets, also comprising an inner sack (1), which consists of synthetic thermoplastic film and is closed at its bottom end by a transverse seam weld (3), which lies on the flattened outer sack above the bottom seam or, if desired, above the fold line disposed above the bottom seam, wherein the girth of the inner sack (1 ) is at least as large as the girth of the outer sack (2) and when the transverse seam weld has been formed at least one marginal portion of the inner sack is folded on itself so that the inner sack is folded to a width which corresponds to the distance between mutually opposite outer fold lines of the side gussets of the outer sack, characterized in that that portion of the inner sack (1) which protrudes over the transverse seam weld (3) is joined to the bottom seam of the outer sack and the inner sack is provided with transversely extending cuts (5) or with easily destructible perforation lines adjacent to its lateral folds between the bottom seam or the fold line disposed above said bottom seam, on the one hand, and the transverse seam weld (3), on the other hand.
2. A siede-gusseted sack according to claim 1, characterized in that the inner sack (1 ) is provided between the cuts (5) or the easily destructible perforation lines with a perforation line (10) which connects the cuts or perforation lines.
3. A process of manufacturing a side-gusseted sack according to claim 1 or 2, wherein an internal tubular film which subsequently forms the inner sacks (1) and consists of synthetic thermoplastic material and is provided with transverse seam welds (3) for closing the subsequently formed bottoms is laid onto the web (2), which constitutes the outer sack and consists, if desired, of a plurality of plies, the marginal portions of the web (2) are infolded to form a tubular web, their overlapping portions are joined to each other by a longitudinal seam, the tubular web or previously the web is provided with side gussets so that the outer edges of the inner tubular film lie in one of the outer folds of the side gussets, at least one marginal portion of the inner tubular film is reversely folded previously or simultaneously to fold the internal tubular film to a width which corresponds to the distance between mutually opposite outer fold lines of the side gussets of the outer tubular web, and portions are severed from the tubular film and provided with bottom seams, characterized in that the inner tubular film is provided with transverse cuts (5) or easily destructible perforation lines adjacent to the side gussets or lateral reverse folds between each transverse seam weld (3) and the subsequently formed bottom fold line or bottom seam of the outer tubular web.
4. A process according to claim 3, characterized in that the cuts (5) or easily destructible perforation lines are interconnected by a perforation line (10).
5. A process according to claim 3 or 4, characterized in that a severable perforation line (7) is provided on that side which is opposite to the subsequently formed bottom fold line (a-a) or bottom seam of the tubular web.
6. A process according to claim 5, characterized in that the several tube sections are severed at the perforation lines by being pulled off when the cuts (5) connected by the perforation lines (10) are disposed in a tube-drawing machine outside the region between the nips of the pairs of severing rollers (8, 9).
7. A process according to claim 5 or 6, characterized in that the distance between the cuts (5) or the perforation line (10) connecting said score lines and the severable perforation line (7) is increased by an extent which approximately corresponds to the length of one Z-fold.
8. A process according to any of claims 3 to 7, characterized in that the inner tubular film (1) is provided with side gussets before the bottom seam welds (3) are formed.
EP84100594A 1983-01-27 1984-01-20 Side fold bag with an upholding outer bag and a liner bag, and method for its production Expired EP0121041B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84100594T ATE26670T1 (en) 1983-01-27 1984-01-20 SIDE-FOLD BAG WITH SUPPORTING OUTER BAG AND INNER BAG AND PROCESS FOR ITS MANUFACTURE.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3302749 1983-01-27
DE3302749 1983-01-27
DE3304657A DE3304657C1 (en) 1983-01-27 1983-02-10 Gusseted bag with a carrying outer bag and inner bag and process for its production
DE3304657 1983-02-10

Publications (3)

Publication Number Publication Date
EP0121041A2 EP0121041A2 (en) 1984-10-10
EP0121041A3 EP0121041A3 (en) 1985-04-17
EP0121041B1 true EP0121041B1 (en) 1987-04-22

Family

ID=25807853

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100594A Expired EP0121041B1 (en) 1983-01-27 1984-01-20 Side fold bag with an upholding outer bag and a liner bag, and method for its production

Country Status (2)

Country Link
EP (1) EP0121041B1 (en)
DE (1) DE3304657C1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3792192B1 (en) * 2019-09-16 2023-08-09 Mondi AG Packaging bag assembly and method for manufacturing and handling the packaging bag assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3635809A1 (en) * 1986-10-22 1988-05-05 Wilhelmstal Werke Gmbh Cross-bottom composite sack and process for the production thereof
US4978231A (en) * 1989-02-24 1990-12-18 Ling Zhang A Multiple disposable plastic bag assembly
DE19804735B4 (en) * 1998-02-06 2006-06-29 Windmöller & Hölscher Kg Method and device for aligning two webs brought together into a multilayer web
FR3093706B1 (en) * 2019-03-13 2021-04-30 Coveris Flexibles France Recyclable packaging bag, and method of making such a bag

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3929275A (en) * 1972-07-07 1975-12-30 Union Camp Corp Bags with film liners and method of making
DE2461828A1 (en) * 1974-12-30 1976-07-08 Windmoeller & Hoelscher ONE-SIDED MULTI-PAYER BAG
DE2643508A1 (en) * 1976-09-28 1978-03-30 Gartemann & Hollmann Gmbh Paper bag with plastic lining pleated at the sides - opens more reliably for filling

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3792192B1 (en) * 2019-09-16 2023-08-09 Mondi AG Packaging bag assembly and method for manufacturing and handling the packaging bag assembly

Also Published As

Publication number Publication date
EP0121041A3 (en) 1985-04-17
EP0121041A2 (en) 1984-10-10
DE3304657C1 (en) 1984-09-06

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