WO2021043908A1 - Sac à fond croisé en papier couché et procédé de production d'un sac à fond croisé - Google Patents

Sac à fond croisé en papier couché et procédé de production d'un sac à fond croisé Download PDF

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Publication number
WO2021043908A1
WO2021043908A1 PCT/EP2020/074608 EP2020074608W WO2021043908A1 WO 2021043908 A1 WO2021043908 A1 WO 2021043908A1 EP 2020074608 W EP2020074608 W EP 2020074608W WO 2021043908 A1 WO2021043908 A1 WO 2021043908A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
paper
areas
cover sheet
cross
Prior art date
Application number
PCT/EP2020/074608
Other languages
German (de)
English (en)
Inventor
Andreas Kleemann
Andreas Lamkemeyer
Original Assignee
Windmöller & Hölscher 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 Windmöller & Hölscher Kg filed Critical Windmöller & Hölscher Kg
Publication of WO2021043908A1 publication Critical patent/WO2021043908A1/fr

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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
    • B65D29/00—Sacks or like containers made of fabrics; Flexible containers of open-work, e.g. net-like construction
    • B65D29/02—Sacks with laminated or multiple walls
    • 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
    • B31B70/02—Feeding or positioning sheets, blanks or webs
    • B31B70/10—Feeding or positioning 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
    • 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
    • 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
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B31B70/644—Making seals parallel to the direction of movement, i.e. longitudinal sealing
    • 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
    • B31B70/812—Applying patches, strips or strings on sheets or webs
    • B31B70/8122—Applying patches
    • 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
    • B31B70/84—Forming or attaching means for filling or dispensing contents, e.g. valves or spouts
    • B31B70/85—Applying patches or flexible valve inserts, e.g. applying film-like valves
    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/08—Bags or like containers made of paper and having structural provision for thickness of contents with block bottoms
    • 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
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • B31B2150/001—Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom
    • B31B2150/0014—Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom having their openings facing transversally to the direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/003—Flexible containers made from webs starting from tubular 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
    • B31B2160/20—Shape of flexible containers with 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

Definitions

  • the invention relates to a cross-bottom sack and a method for its production.
  • packaging materials are usually necessary, which make these loose goods movable in individual portions, for example by hand.
  • the packaging should also protect the goods filled in them, for example from moisture.
  • Cross-bottom sacks have proven particularly useful in the field of powdery or granular goods. Such bags are prefabricated and then filled. The weight of such bags after they have been filled is usually 10 kg to 50 kg.
  • a kraft paper is generally used which comprises at least predominantly long-fiber cellulose fibers, the proportion of waste paper and / or fillers being very low ( ⁇ 1%).
  • the object of the present invention is therefore to propose a cross-bottom sack and a production method, such a sack being cheaper and faster to produce.
  • a cross-bottom sack comprises a first and a second outer layer, which are connected by means of a first and a second longitudinal edge, the two outer layers delimiting an interior space, the first and the The second outer layer comprises at least two layers, at least in some areas, a first layer comprising paper and a second layer provided at least in some areas comprising a plastic layer, the first and second outer layers being connected by means of at least one bottom, which has two triangular pockets and two tabs placed one on top of the other in some areas comprises, wherein a bottom cover sheet is provided which is connected to both triangular pockets and both tabs, wherein the bottom cover sheet comprises a first layer of paper and preferably a second layer provided at least in regions, a plastic layer, wherein the bottom cover sheet with areas of the plastic layers of the triangular pockets and the tabs is permanently and adhesive-free connected.
  • a separate plastic film web is primarily dispensed with.
  • the paper layers of the cross-bottom sack are at least partially provided with a plastic coating before processing and in particular in the area of the later bottoms. Due to these features alone, a more cost-effective production of cross-bottom sacks is possible.
  • a coating on a substrate, in this case on paper usually requires a smaller layer thickness compared to the layer thickness of a separately supplied plastic film.
  • a non-detachable connection is understood to mean that the base cover sheet is materially connected to areas of the plastic layers and the tabs. In particular, this means that no adhesive is applied. This also means that no heat-activatable adhesive (“hot-melt”) is used. As a result, there is no need to add a consumable during the production of the cross-bottom sack, so that further cost savings can be achieved.
  • the plastic layer cannot be removed from the flaps, the triangular pockets and the bottom cover sheets without also pulling paper fibers along with it.
  • the bottom cover sheet is therefore directly connected to the plastic layers of the triangular pockets and the tabs, the plastic layer being connected in particular to the fibers of the bottom cover sheet.
  • This can be achieved, for example, in that the plastic coating is strongly heated in a manufacturing process and becomes very soft to almost liquid in the process.
  • the base cover sheet can be pressed on or pressed on, so that the plastic comes into strong contact with the paper of the base cover sheet or even partially penetrates the paper.
  • the plastic is firmly connected not only to the triangular pockets and / or the tabs, but also to the bottom cover sheet.
  • the base cover sheet likewise comprises - at least in some areas - a plastic coating.
  • the plastic coating is connected to the paper fibers. If the plastic coatings of the tabs and / or the triangular pockets and the plastic coating of the bottom cover sheet are heated to the liquefaction limit or even beyond, the two plastic coatings can combine with one another after these components have been brought into contact and pressed together. After a cooling period, the two plastic coatings are consequently only perceptible as a single plastic layer. It should be emphasized that, if you look closely, there is no liquefaction limit, as a plastic coating usually does not go through a phase transition.
  • Heating up to the liquefaction limit thus means that, on a microscopic basis, a sufficient number of molecular connections have subsequently been broken so that the corresponding molecules can form new connections with molecules of other coatings or other paper layers. Such new connections can be comparatively strong after a renewed cooling.
  • the paper-encompassing layer of the first outer layer and the second outer layer is directed towards the interior.
  • the paper-encompassing layer provides capillarity for water molecules.
  • the paper thus has a certain blotting-sheet function and can absorb moisture that has either got onto the paper from the outside or has been entered with the filling material.
  • an inner layer made of paper is also permeable to gases, in particular air. In this way, the air can pass through the paper and, if other conditions are met, escape into the environment.
  • a prerequisite is, for example, that the plastic coating is only applied over part of the area and not over the entire area.
  • the degree of shrinkage of the paper-encompassing layer is less than 1% per 100 degrees of temperature increase. This shrinkage allows a Sufficient format stability if, for the purpose of heating, parts of a plastic layer are exposed to heat and also cooled again later. If this format stability were not present to the specified extent, the paper material could warp during heating and / or cooling, so that a later sack would have quality defects such as a bottom cover sheet that was not applied in the correct position.
  • parts of the outer surfaces of the outer layers are uncoated and provide a higher flaft coefficient than the coated areas.
  • the outer surfaces of the outer layers are at most partially coated with plastic. If, for example, two sacks are placed one on top of the other, as is the case in particular on a pallet, the aforementioned features prevent or even prevent the two sacks from being displaced relative to one another. This greatly restricts slipping, for example on a pallet, so that the pallet is very stable. This enables safer transport.
  • parts of the outer surfaces are embossed.
  • Embossings are, for example, bulges of the outer layers, the bulges being directed outwards. If a sack now rests on another sack, this other sack comprising embossings, this reduces the contact surface and thus increases the contact pressure. This also reduces the possibility of the two bags slipping against one another.
  • the embossing is done by pushing the ram into the inside of the outer layers, avoiding the penetration of the layers. This can result in elevations on the outsides which are, for example, hemispherical.
  • first layer and the second layer of the first and / or the second outer layer and / or the bottom cover sheet are partially detachable from one another are connected.
  • first areas of the connection between the bottom cover sheet and the first and / or the second outer layer are non-detachable with one another, but second areas are releasably connected with one another.
  • these second areas can be manually detached from one another.
  • areas of the bottom cover sheet can be peeled off, with the paper in particular remaining free of damage. This can create an opening through which the interior of the cross-bottom bag is accessible or through which the contents of the cross-bottom bag can be poured out. Since the paper remains free of damage through this measure, trickle losses can be avoided, especially when pouring out.
  • the first layer of the bottom cover sheet has a greater density and / or a greater weight per unit area than the first layer of the first and / or the second outer layer.
  • the first layer of the bottom cover sheet thus provides a greater specific load capacity than the first layer of the first and / or second outer layer. In this way it is possible to produce a bottom of the sack with greater stability.
  • folded edges in the base which are indispensable for the lowering of a sack according to the invention, represent weaknesses in the material. If the base cover sheet is now made more stable, these weaknesses can be compensated for.
  • perforations can be provided in regions of the outer layers which comprise a first layer and a second layer.
  • Perforations are to be understood as an area with a plurality of through openings, i. H,. the perforations provide unobstructed passages for air or other gases so that these can pass through the outer layers.
  • Such perforations are particularly important during the filling process, in which air or other gases are usually also introduced into the interior of the sack with the filling material. However, it is usually desired that the air is released again from the interior of the sack to the environment after the filling process.
  • the perforations are now provided in an area in which one Plastic layer is arranged, the perforations can now be closed by, for example, the plastic is heated in the area of these perforations and flows into the perforation holes. After the plastic has cooled down again, the perforations are permanently closed, so that complete tightness, which also prevents moisture penetration, can almost be achieved.
  • the tear strength according to ISO 1974 (Elmendorf) of the first and / or the second outer layer is at least 3000 mN.
  • the usual filling weights of bags in the range from 5 kg to 50 kg sufficient strength is provided even if, for example, an outer layer has damage such as a small tear.
  • the first and second outer layers each comprising at least two layers at least in some areas, a first layer comprising paper and a second layer provided at least in some areas comprising a plastic layer,
  • first and the second outer layer are connected by means of at least one base, whereby a base rectangle is drawn out with the formation of two triangular pockets, which comprises two flaps,
  • the bottom cover sheet comprises a first layer made of paper and preferably a second layer provided at least in some areas, a plastic layer
  • the plastic layer of the bottom cover sheet with areas of the plastic layers of the triangular pockets and the tabs are connected to one another without adhesive by means of direct heating.
  • the same advantages can be achieved with this method as have already been described in connection with the cross-bottom sack according to the invention.
  • Features of the cross-bottom sack can therefore also be associated with the method according to the invention.
  • the method according to the invention can advantageously be further developed in that the first and the second outer layer are produced from a paper web, the paper web being turned over along the longitudinal edges, the edge regions of the paper web overlapping along a longitudinal strip in an overlap region, so that the paper web then forms a tube. In this way, a tube can be produced in a simple manner from a flat paper web. One of the two outer layers will then encompass the overlap area.
  • At least one of the two mutually facing sides of the overlap area is provided with parts of the second layer. It is therefore provided that in the overlap area at least one of the two sides facing each other is provided with a plastic layer in order to be able to produce a tube from a flat web, in which the two sides facing each other are connected to one another by means of a sealing process, in particular by means of a hot air sealing process can.
  • a flat web made of paper which is suitable for carrying out the method according to the invention, can partially comprise a second layer on one side and also have a second layer on the other side in its edge region.
  • the second layer is provided in the overlap area on both sides facing one another, which enables a sealed connection in a simple manner. Furthermore, it is advantageous if the paper web and / or the tube is needled, in particular by means of a needle roller, which is preferably switched on and off the paper web in cycles. By performing needling, openings are thus created which, as has already been described in connection with a cross-bottom sack according to the invention, convey an escape of air, which has been brought in in particular during the filling process, out of the interior of the sack.
  • a simple way of producing such needles is to use a needle roller that carries a large number of needles on its outer circumference, which penetrate into the paper web or into the paper tube and thus pierce the first and / or the second outer layer. It can be advantageous that the needle roller is brought out of engagement with the paper web at time, in particular at regular time intervals, in order not to generate any needling, particularly at points on the paper web where the bottom folds will later occur. Since folds often weaken the material, additional weakening of the material by needling can be avoided.
  • FIG. 1 Schematic representation of the tube formation.
  • Fig. 2 Processing steps for the production of sacks.
  • Fig. 3 Schematic representation of the production of sacks
  • Fig. 1 shows a schematic diagram for tube formation from a paper material. This tube formation takes place in a tube formation station 1.
  • a flat web material 2 which is provided in the form of a roll 3, is fed to the tube formation station 1.
  • This lap 3 can rotate on or with a lap carrier 4, which is mounted, for example, in the machine frame of the tube-forming station or in the frame of an unwinding station.
  • the flat web material 2 comprises at least regionally two layers.
  • the first layer is a layer comprising paper and is marked with the letter I, since this layer is directed inwards after the tube formation.
  • the second layer which faces outwards after the tube formation, is identified with the letter A.
  • this layer comprises, in particular, only a line 7 made of a plastic material and is close to an edge or directly on the edge of the outside.
  • the flat web material 2 is transported in the transport direction z by one or more pulling and / or advancing devices. Preference or feed devices, which can include pairs of transport rollers, are not shown in FIG. After unwinding, one side of the flat web material 2 is first turned over onto itself by means of a guide plate 5. Further guide elements can also be provided for the simultaneous formation of side folds, which, however, are not shown.
  • the second side is also turned over. Both sides are folded in so far that the side edges are then on top of each other.
  • the second page is turned over again with a guide element, which can be designed like the guide plate 5.
  • This guide element is not shown for the sake of clarity.
  • the first side edge on the outside that comes into contact with the second side edge is subjected to a treatment which serves to join the two side edges.
  • a hot air device 6 is shown, with which a hot air stream is given approximately in the direction of the edge of the first side.
  • the second layer is heated up to or slightly below its liquefaction.
  • the inside of the second side is applied to the first side.
  • the inside of the first layer - or more precisely its edge - is brought into connection with the second layer, whereby the melted plastic can connect to the fibers of the paper-encompassing layer, so that a very firm connection is brought about.
  • the hot air device 6 comprises a hot air nozzle 8, to which a hot air stream can be fed via a feed line which is not explained in detail.
  • the hot air nozzle 8 can be mounted displaceably in the direction of the double arrow B transversely to the transport direction of the flat web material 2.
  • the joint seam can be pressed with a pressing device 10 in order to connect the inside of the first layer and the melted plastic well together.
  • This pressing device advantageously comprises a pressing roller 11, which can be part of a pair of pressing rollers.
  • the pressure roller 11 can be rotated relative to the machine frame via an axis or shaft 12.
  • the pressure roller 11 can also be used to cool the joint seam.
  • the roller 11 can be designed in such a way that a cooling medium can flow through it. When the roller 11 comes into contact, it can then dissipate heat from the joint seam, so that the joint seam has sufficient durability more quickly.
  • a perforating device 28 is provided which can comprise a perforating roller 29 which rotates relative to the machine frame and can carry needles 30 on its outer circumference, which can penetrate into the hose material and thus produce ventilation holes.
  • Other types of perforating devices for example contactless, are also conceivable.
  • the arrangement of the perforating device is also not limited to the arrangement shown.
  • the perforating device can also be arranged in front of the actual tube forming device. An arrangement directly in front of the separating device is also conceivable. In any case, however, the perforation must have taken place before the hose is separated into hose pieces.
  • This tube which was transported as a lap 14 from the tube-forming station 1 into the unwinding device 16, is separated into individual tube pieces 18 by means of a separating device 17, which comprises, for example, a cutting blade that can be displaced transversely to the initial transport direction y.
  • the transport direction of the tube pieces 18 is then changed so that they are now transported further in the direction z transversely to their direction of extension, which points in the direction y.
  • a transport device 19 is provided, which can be configured, for example, as a double belt conveyor.
  • the ends of the tube pieces are first pulled open.
  • This step can be done with the help of suction cups, which pull the two layers apart at the ends.
  • suction cups With spreaders you can now the layers are brought into one plane and spread out, the bottom being folded over along the so-called bottom center line 20.
  • the ends drawn up in this way now form a bottom rectangle 21 with lateral triangular pockets 22.
  • FIG. 2 only the corresponding elements of the lower end of the hose section 18 are provided with reference numerals. However, these also apply mutatis mutandis to the other end of the hose section.
  • a valve label 23 can now be applied to an open end of the tube piece 18 and fastened there.
  • the fastening is advantageously carried out by means of hot air welding, the valve label 23 being fastened at least to the triangular pocket 22.
  • the outer flaps 24 of the bottom rectangle 21 are now folded back so far that the outer edge of a flap 24 is moved over the bottom center line 20.
  • the folding back takes place, for example, with guide elements, such as with guide plates.
  • the areas of the triangular pockets, which are also folded back during this process, can be connected to one another.
  • the inner flaps 25 can also be folded back.
  • the inner flaps 25 are, however, preferably folded back in method step d, the inner flap 25 now covering the outer flap 24 in an overlapping area. In this overlap area, both flaps can be connected to one another, so that a usable sack bottom has already been created. Since the valve label 23 was also tucked in, a valve hose was created in this way, which enables the bag to be filled, but prevents the material to be filled from escaping after filling.
  • a further processing step e takes place, in which a base cover sheet 26 is applied to each of the already closed bases and is preferably fastened using a hot air welding process.
  • the bottom cover sheet 26 is included preferably dimensioned so that it covers areas of the tabs 24 and 25 and areas of the triangular pockets 22. It is also placed on the floor with its plastic layer so that the plastic layers face each other. This enables a very durable connection which can be produced by hot air welding.
  • the tab 25 can be provided with cutouts so that the bottom cover sheet 25 also has direct contact with the tab 24 in the area of this overlap. In a similar manner, direct contact of the bottom cover sheet 26 with the valve label 23 can be made.
  • FIG. 3 again shows, in a schematic representation, the individual method steps for producing sacks from a flat web material.
  • the winding of the hose, the transport of the roll and the renewed unwinding of the hose are dispensed with.
  • a deflection device 27 is provided which deflects the finished tube 13 from the transport direction z into the transport direction y. This deflection device can be displaced along the double arrow C in or against the direction z, so that the position of the side edge can be changed after the deflection in or against the direction z.
  • FIG. 3 also shows a method step f in which several bags are stacked before they are packed in a transport container, for example.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)

Abstract

L'invention concerne un sac à fond croisé comprenant des première et seconde couches extérieures qui sont reliées au moyen de premier et second bords longitudinaux. Les deux couches extérieures délimitent un espace intérieur. Les première et seconde couches extérieures comprennent chacune, au moins dans certaines régions, au moins deux épaisseurs, une première épaisseur comprenant du papier et une seconde épaisseur, qui est disposée au moins dans certaines régions, comprenant une épaisseur de plastique. Les première et seconde couches extérieures sont reliées au moyen d'au moins un fond ; ce fond comprend deux poches triangulaires et deux languettes placées l'une sur l'autre dans certaines régions. Une feuille de protection inférieure est présente et est reliée aux deux poches triangulaires et aux deux languettes. La feuille de protection inférieure comprend une première épaisseur composée de papier et de préférence une épaisseur de plastique en tant qu'au moins une seconde épaisseur fournie. La feuille de protection inférieure, au moins dans certaines régions, est reliée non amovible à des régions des épaisseurs de plastique des poches triangulaires et des languettes sans utiliser d'adhésif.
PCT/EP2020/074608 2019-09-05 2020-09-03 Sac à fond croisé en papier couché et procédé de production d'un sac à fond croisé WO2021043908A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019213476.9A DE102019213476A1 (de) 2019-09-05 2019-09-05 Kreuzbodensack aus beschichtetem Papier sowie Verfahren zur Herstellung eines Kreuzbodensacks
DE102019213476.9 2019-09-05

Publications (1)

Publication Number Publication Date
WO2021043908A1 true WO2021043908A1 (fr) 2021-03-11

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WO (1) WO2021043908A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB979089A (en) * 1962-03-31 1965-01-01 Alfred Windmoller A block-bottom valve bag of thermoplastic material having bottom inserts
DE4323927A1 (de) * 1993-07-16 1995-01-19 Fischer & Krecke Gmbh & Co Klotzbodenbeutel
DE102014206790A1 (de) * 2014-04-08 2015-10-08 Windmöller & Hölscher Kg Packmittel sowie Vorrichtung und Verfahren zur Herstellung eines Packmittels
DE102014206792A1 (de) * 2014-04-08 2015-10-08 Windmöller & Hölscher Kg Packmittel sowie Verfahren und Vorrichtung zur Herstellung eines Packmittels

Family Cites Families (4)

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