EP0121041B1 - Sac à plis latéraux avec sac extérieur de consolidation et sac intérieur ainsi que procédé pour sa fabrication - Google Patents

Sac à plis latéraux avec sac extérieur de consolidation et sac intérieur ainsi que procédé pour sa fabrication 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
Authority
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
Other languages
German (de)
English (en)
Other versions
EP0121041A2 (fr
EP0121041A3 (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
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 NIEDERMAYR PAPIERWARENFABRIK AG filed Critical NIEDERMAYR PAPIERWARENFABRIK AG
Priority to AT84100594T priority Critical patent/ATE26670T1/de
Publication of EP0121041A2 publication Critical patent/EP0121041A2/fr
Publication of EP0121041A3 publication Critical patent/EP0121041A3/de
Application granted granted Critical
Publication of EP0121041B1 publication Critical patent/EP0121041B1/fr
Expired legal-status Critical Current

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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
    • B31B70/26—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.

Landscapes

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

Claims (8)

1. Sac à plis latéraux comportant un sac extérieur de consolidation (2) de préférence en papier à une ou plusieurs couches, dont le fond est fermé par une couture de fond saisissant les plis latéraux et un sac intérieur (1 ) en feuille synthétique thermoplastique dont l'extrémité côté fond est fermée par une soudure transversale (3) qui se trouve dans le sac extérieur couché à plat au-dessus de la couture du fond ou, le cas échéant, au-dessus de la ligne de pliure se trouvant au-dessus de la couture du fond, le sac intérieur (1 ) dont la circonférence correspond au moins à la circonférence du sac extérieur (2) étant plié après que la soudure transversale ait été pratiquée, en repliant au moins un bord sur lui-même à une largeur qui correspond à la distance entre les plis extérieurs opposés des plis latéraux du sac extérieur, caractérisé en ce que la partie du sac intérieur (1 ) qui dépasse la soudure transversale (3) est raccordée à la couture du fond du sac extérieur et que le sac intérieur est pourvu de coupes transversales (5) ou de lignes de perforation faciles à détruire dans la zone de ses plis latéraux entre la couture du fond ou la ligne de pliage au-dessus de celle-ci d'une part et la soudure transversale (3) d'autre part.
2. Sac à plis latéraux selon la revendication (1), caractérisé en ce que le sac interieur (1) est pourvu entre les coupes (5) ou les lignes de perforation faciles à détruire d'une ligne de pérfora- tion (10) qui relie les coupes ou lignes de perforation.
3. Procédé de fabrication d'un sac à plis latéraux selon la revendication 1 ou 2 qui comporte un film tubulaire intérieur qui forme par après le sac intérieur (1 ), qui consiste en une matière synthétique thermoplastique, est pourvu de soudures transversales (3) pour fermer les fonds formés par après et est couché sur la bande de matériau (2) qui constitue le sac extérieur et consiste, le cas échéant, en plusieurs couches, les parties du bord de la bande de matériau (2) étant pliées vers l'intérieur pour former une bande tubulaire, leurs parties chevauchantes étant raccordées entre elles par une couture longitunale, la bande tubulaire ou précedemment la bande de matériau étant pourvue de plis latéraux de sorte que les bords extérieurs du film tubulaire intérieur sont couchés dans un des plis extérieurs des plis latéraux, au moins une des parties du bord du film tubulaire intéreur étant repliée précédemment ou simultanément pour replier le film tubulaire intérieur à une largeur qui correspond à la distance entre les lignes de pliage extérieures opposées des plis latéraux de la bande tubulaire extérieure, des sections étant tranchées du film tubulaire et pourvues de coutures de fond, caractérisé en ce que le film tubulaire intérieur est pourvu de coupes transversales (5) ou de lignes de perforation faciles à détruire dans la zone des plis latéraux ou replis latéraux entre chaque soudure transversale (3) et la ligne de pliage du fond formé successivement ou la couture du fond de la bande tubulaire extérieure.
4. Procédé selon la revendication 3, caractérisé en ce que les coupes (5) ou lignes de perforation faciles à détruire sont reliées par une ligne de perforation (10).
5. Procédé selon la revendication 3 ou 4, caractérisé en ce qu'une ligne de perforation pouvant être séparée (7) est pourvue sur le côté qui est opposé à la ligne de pliage du fond formé successivement (a-a) ou à la couture de fond de la bande tubulaire.
6. Procédé selon la revendication 5, caractérisé en ce que les différentes sections de bandes tubulaires sont séparées le long des lignes de perforation en étant arrachées lorsque les coupes (5) reliées par les lignes de perforation (10) sont disposées dans une machine à étirer les films tubulaires dans l'intervalle entre les paires de cylindres tranchants (8, 9).
7. Procédé selon la revendication 5 ou 6, caractérisé en ce que la distance entre les coupes (5) ou la ligne de perforation (10) qui les relie et la ligne de perforation (7) est augmentée d'une distance qui correspond approximativement à la longueur d'un pli en Z.
8. Procédé selon l'une quelconque des revendications 3 à 7, caractérisé en ce que le film tubulaire intérieur (1 ) est pourvu de plis latéraux avant que les soudures de fond (3) soient pratiqués.
EP84100594A 1983-01-27 1984-01-20 Sac à plis latéraux avec sac extérieur de consolidation et sac intérieur ainsi que procédé pour sa fabrication Expired EP0121041B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84100594T ATE26670T1 (de) 1983-01-27 1984-01-20 Seitenfaltensack mit tragendem aussensack und innensack sowie verfahren zu seiner herstellung.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3302749 1983-01-27
DE3302749 1983-01-27
DE3304657 1983-02-10
DE3304657A DE3304657C1 (de) 1983-01-27 1983-02-10 Seitenfaltensack mit tragendem Aussensack und Innensack sowie Verfahren zu seiner Herstellung

Publications (3)

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

Family

ID=25807853

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100594A Expired EP0121041B1 (fr) 1983-01-27 1984-01-20 Sac à plis latéraux avec sac extérieur de consolidation et sac intérieur ainsi que procédé pour sa fabrication

Country Status (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3792192B1 (fr) * 2019-09-16 2023-08-09 Mondi AG Agencement de sacs d'emballage ainsi que procédé de fabrication et de manipulation de l'agencement de sacs d'emballage

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3635809A1 (de) * 1986-10-22 1988-05-05 Wilhelmstal Werke Gmbh Kreuzboden-kombinationssack und verfahren zu dessen herstellung
US4978231A (en) * 1989-02-24 1990-12-18 Ling Zhang A Multiple disposable plastic bag assembly
DE19804735B4 (de) * 1998-02-06 2006-06-29 Windmöller & Hölscher Kg Verfahren und Vorrichtung zum Ausrichten zweier zu einer mehrlagigen Bahn zusammengeführter Bahnen
FR3093706B1 (fr) * 2019-03-13 2021-04-30 Coveris Flexibles France Sac d’emballage à recyclage facilité, et procédé de fabrication d’un tel sac

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 (de) * 1974-12-30 1976-07-08 Windmoeller & Hoelscher Einseitig offener mehrlagensack
DE2643508A1 (de) * 1976-09-28 1978-03-30 Gartemann & Hollmann Gmbh Mehrlagiger sack

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3792192B1 (fr) * 2019-09-16 2023-08-09 Mondi AG Agencement de sacs d'emballage ainsi que procédé de fabrication et de manipulation de l'agencement de sacs d'emballage

Also Published As

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

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