EP3037254B1 - Method for producing a plastic tissue bag and plastic tissue bag - Google Patents

Method for producing a plastic tissue bag and plastic tissue bag Download PDF

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Publication number
EP3037254B1
EP3037254B1 EP14200207.0A EP14200207A EP3037254B1 EP 3037254 B1 EP3037254 B1 EP 3037254B1 EP 14200207 A EP14200207 A EP 14200207A EP 3037254 B1 EP3037254 B1 EP 3037254B1
Authority
EP
European Patent Office
Prior art keywords
coating
plastic
material web
bag
transverse direction
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.)
Active
Application number
EP14200207.0A
Other languages
German (de)
French (fr)
Other versions
EP3037254A1 (en
Inventor
Sabine Scheele
Jens Kösters
Jochen Brauer
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.)
Mondi AG
Original Assignee
Mondi 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 Mondi AG filed Critical Mondi AG
Priority to EP14200207.0A priority Critical patent/EP3037254B1/en
Priority to MX2015017352A priority patent/MX2015017352A/en
Priority to CA2915706A priority patent/CA2915706C/en
Priority to US14/975,934 priority patent/US9809354B2/en
Publication of EP3037254A1 publication Critical patent/EP3037254A1/en
Application granted granted Critical
Publication of EP3037254B1 publication Critical patent/EP3037254B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • 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
    • 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
    • B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/06—Handles
    • B65D33/08—Hand holes
    • 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0012—Flexible containers made from webs by folding webs longitudinally having their openings facing in 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
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
    • 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
    • B31B70/008—Stiffening or reinforcing
    • 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
    • B31B70/26—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
    • 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
    • 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
    • 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
    • B31B70/645—Making seals 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/79—Coating; Impregnating; Waterproofing; Decoating

Definitions

  • the invention relates to the technical field of plastic fabric bags which have a layer of a fabric made of plastic tapes, the fabric made of plastic tapes being partially exposed on an inside of the bag and partially provided with a coating made of plastic.
  • the invention relates to a method for producing a plastic fabric bag, wherein a flat material web is fed along a production direction, which has a fabric made of plastic tapes exposed there on a first, usually upper side, the material web lying perpendicular to the production direction along a transverse direction, each has edge regions extending over 10% of the width of the material web and a middle section therebetween, the material web being provided with a pattern in the form of a film or in the form of a liquid plastic on the first side of the material web with a pattern recurring along the production direction , wherein the material web is formed into a material tube and wherein pieces are separated from the material tube, filled and sealed to form individual plastic fabric bags.
  • Plastic fabric bags are characterized by good functional properties, especially a high load-bearing capacity.
  • the fabric made of plastic tapes is connected to a polymer film, which forms the outside of the plastic fabric bag.
  • the polymer film on the outside creates a high-quality appearance and seals the bag wall.
  • the individual ribbons of the fabric fixed to each other so that they cannot move.
  • the fabric is preferably made of polypropylene.
  • the fabric and the polymer film on the outside are connected to each other over a large area and form a firm plastic fabric bond.
  • the polymer film can be prefabricated as a separate film and laminated to the fabric or extruded onto the fabric.
  • the plastic fabric bag is usually closed by adhesive tapes because the fabric made of plastic tapes is not reliable and cannot be heat-sealed.
  • a generic method for producing a plastic fabric bag and a generic plastic fabric bag are from the DE 10 2011 080 462 A1 known.
  • a coating is only applied in the form of strips which run in the transverse direction in the case of the flat material web.
  • the strips extend with a constant strip width - that is, a constant length in the direction of production - over almost the entire width, with only the coating on the outer edge areas either being recessed or changes into a continuous coating along the production direction.
  • a paper folding bag is known, the paper being provided with a heat-sealable coating, so that when the bag is formed, this coating can be connected to itself after the paper web has been folded.
  • the present invention has for its object to provide a particularly cost-effective production of a plastic fabric bag, which is characterized by improved functional properties.
  • the object of the invention and the solution to the problem is a method for producing a plastic fabric bag according to claim 1.
  • the application of the coating changes in the transverse direction on the central section.
  • the present invention is based on the knowledge that the order that changes in the transverse direction on the central section both saves considerable material as well as extended functionalities can be realized.
  • the application of the coating can change in quantity, course and / or shape. In particular, there may be recesses and steps.
  • the proportion of the surface provided with the coating is usually less than 30%, in particular less than 25%, for example between 5% and 20%, based on the total surface of the material web.
  • a film or a plastic is provided as the coating, which is applied in a liquid state.
  • the plastic can in particular also be viscous and can be applied hot or cold.
  • suitable transfer processes for example as a transfer roller.
  • a sealing wax cold which first dries and then can subsequently be heat-sealed.
  • an adhesive can also be applied, which then causes a connection directly when the film tube is formed, but preferably a coating is provided which is only intended for subsequent heat sealing.
  • the present invention is also based on the knowledge that the coating does not necessarily have to be connected to itself after the material hose has been formed, that is, it does not have to be present on the two surfaces to be connected to one another in the material hose. In order to achieve a connection, it is in fact sufficient if the coating is only present on one of the two surfaces to be connected to one another, with the coating, which is preferably liquefied by the supply of temperature during heat sealing, then also on the first non-coated surface can form an intimate connection with the tissue.
  • the coating in the form of a strip only extends in the transverse direction over approximately half of the material web.
  • the plastic fabric bag is designed as a side-gusset bag
  • the coating can be designed as a segmented strip, the strip segments being arranged in such a way that, in the case of the flat-lying side-gusset bag, at least one side is provided with the coating on all surfaces which are to be connected to one another.
  • the coating is applied in the form of crosswise, optionally segmented strips, the strips only extending over 40% to 60% of the width.
  • this information relates to the total length of all strip segments.
  • the coating has a first section and at least one second section adjoining it in the transverse direction, the first section having a first length l 1 and the second section having a greater length l 2 when viewed in the production direction .
  • Such a coating also preferably runs straight or obliquely in the transverse direction.
  • the stripe width changes along the course of the coating, that is to say preferably in the transverse direction. This makes it possible to locally vary the strength of a connection produced using the coating.
  • an area can be provided starting from a bag edge, which only has one narrow connecting seam is closed, the plastic fabric bag then being able to be opened there by hand, while adjacent to it the surfaces lying on one another are connected by a wide connecting seam and are thus permanently fixed.
  • a material tube is formed starting from a flat material web, individual plastic fabric bags then being produced from pieces of the material tube. Accordingly, the coating is carried out along the production direction with a recurring pattern. Irrespective of this, even the coating can be applied in a liquid state with a coating pattern in the areas to be coated. This means that there is no completely continuous layer in the areas to be coated. For example, a coating pattern of intersecting strips can be provided, which due to their structure enable a reliable and tight connection, but a further material saving can be achieved by such a coating pattern.
  • the method according to the invention can not only be used to produce a closure seam in a plastic woven bag. Rather, it is also possible to use the coating to produce corner welds in the area of a bag bottom or to enable the inclusion of further functional elements such as reclosures, valves or the like in the bag, thereby considerably expanding the possible uses of the plastic fabric bag in the context of the invention.
  • the coating is subsequently melted to produce a connecting seam
  • a heat sealing tool can be provided, for example, which is larger than the coating, so that it is melted over its entire surface.
  • the shape of the connecting seam is predetermined by the application and the shape of the coating.
  • the at least one connecting seam extends only in part of the coating.
  • the coating can be provided on a larger area without having to adhere to precise specifications for the shape of the coating. If, for example, a film is provided as the coating, it can have a rectangular shape, the precise course of the connecting seam then being determined only when such a film is melted with the application of heat.
  • a plastic melt or a commercially available hot melt adhesive can be provided as the coating, a clear distinction between a conventional polymer material and a hot melt adhesive not being necessary within the scope of the invention.
  • Suitable plastic melts are, in particular, polyolefins such as polyethylene (PE), PE copolymers, polypropylene (PP) or PP copolymers, low-melting plastics which can be polymerized with the aid of metallocene catalysts being particularly preferred. It is preferably provided that the fabric is applied when the coating is applied and subsequently when the coating is thermally melted at most, it is melted on the surface so that the orientation of the molecules in the individual plastic bands, which is crucial for the load-bearing capacity of the fabric, is not lost. When the coating is applied in the molten state and also during processing, good flowability is advantageous, so that the coating can also penetrate into the fabric structure.
  • Polyolefins in particular polyethylene, are particularly suitable for a film as a coating, such a film preferably being able to be attached to the fabric made of plastic tapes using an adhesive, in particular a pressure sensitive adhesive.
  • the method according to the invention can also be used to produce a plastic fabric bag with a bag wall which has a layer of a fabric made of plastic tapes, the fabric being exposed in sections on an inside of the bag and being provided with a plastic coating in sections, with the coating being opposite surfaces the bag wall are connected along at least one connecting seam and the connecting seam closes a head region along a transverse direction.
  • the connecting seam has at least one step in the transverse direction, the height of the connecting seam determined along a longitudinal direction of the plastic fabric bag changing at the step.
  • the seam there is a different width of the connecting seam along its course before and after the step.
  • the connecting seam on the first connecting seam section can be torn open more easily than on the second connecting seam section.
  • a suitable length of the connecting seam along the longitudinal direction i. H. that is, a suitable width of the connecting seam along its course can be produced in the transverse direction of the bag, areas of different strength.
  • first connecting seam section can also run obliquely with respect to the longitudinal and transverse directions and / or have an angled portion. Precisely when peeling, that is to say tearing open, of the connecting seam is to be made possible at the first connecting seam section, an oblique course or an angling with regard to the introduction of force can be advantageous during the tearing open.
  • the plastic fabric bag is designed as a side gusset bag, so that the bag wall then forms a front surface, a back surface and a first side gusset and a second side gusset, the two side gussets connecting the front surface and the back surface to one another.
  • the step described above is preferably located on an edge of the first side gusset inserted between the front surface and the rear surface. It can then be provided that the side gusset bag is opened by first moving the first between the front surface and the rear surface inserted side gusset pulled outwards and thereby the connecting seam on the first connecting seam section is torn open.
  • the first side fold protrudes at the head region over the front surface and the rear surface.
  • the first gusset can then be easily gripped by a user and pulled outwards.
  • a notch can be provided in the front surface and the rear surface adjacent to the first side fold, in which case a user can then grasp the side fold more easily and pull it outwards.
  • the Fig. 1 shows a material web 1 for the production of a plastic fabric bag.
  • the material web 1 is guided along a production direction P, the material web 1 at the in the Fig. 1 has an initially exposed fabric 2 made of plastic tapes.
  • the material web 1 is provided on the fabric 2 only in sections with a coating 3.
  • glued-on films or a liquid-applied plastic can be provided as coating 3.
  • the coating 3 is particularly preferably applied as a molten plastic, it being possible for example to extrude it viscously or to apply it with a transfer roller.
  • the material web 1 is subsequently formed into a material hose in a known manner.
  • a side gusseted tube is to be produced from the material web 1 to form side gusset bags, the kink lines 4, 4 'being indicated in the material web 1 which is still lying flat.
  • a first group of fold lines 4 indicates the transition from a front surface 5a or a rear surface 5b to the side folds 6a, 6b, while on a second group of fold lines 4 'the two side folds 6a, 6b are each folded onto themselves.
  • a fin seam is formed on the edges of the material web 1 during manufacture, which is why a coating can also be provided there.
  • the coating 3 also changes outside the edges at a central section of the material web 1 in the transverse direction Q.
  • the coating 3 is formed in the form of a segmented strip 7 running in the transverse direction Q, the strip 7 with its segments covering a little more than 50% of the width of the material web 1 in Cross direction Q extends. If the material web 1 is formed into a gusseted tube along the kink lines 4, 4 ', then, at the level of the coating 3 over the entire width of the gusseted tube, surfaces lie opposite one another, at least one of which is provided with a coating 3, so that when it melts the coating 3 a tight seal can be achieved.
  • the coating 3 thus fulfills the purpose of an adhesive which is only present in one layer and which then connects the opposite surfaces of the fabric 2.
  • the embodiment shown thus differs from an embodiment in which, according to the prior art, a continuous strip is provided as a coating, which is then only connected to itself.
  • a separation point 8 running in the transverse direction Q is also indicated, at which individual pieces are then separated from the material hose.
  • a top seam or a bottom seam can be produced with the coating 3 severed there on successive plastic fabric bags.
  • the Fig. 2 shows an example of an embodiment not according to the invention, the coating forming different structures.
  • a strip 7 ′ which is provided as a bottom seam and is designed according to the prior art
  • a further strip 7 ′′ is provided for the formation of a connecting seam 9 on a head region of the plastic fabric bag, on which the coating has 3 steps 10.
  • the extent of the Coating 3 along the production direction P which in the exemplary embodiment also corresponds to a longitudinal direction L of the plastic fabric bag, changes at step 10.
  • the corresponding strip 7 "points along its course an area with a smaller stripe width, which also runs obliquely.
  • the section with a smaller strip width on the first side fold 6a can be easily pulled open.
  • contours 3 which are only in sections, can also be used to form other contours, such as, for example, oblique contours, from which connection seams 9 'in the form of corner connections are then subsequently produced.
  • the Fig. 3 finally shows a combination of the measures according to the invention Fig. 1 and the Fig. 2 , After which the coating 3 is arranged in the form of a segmented strip 7 '", which also changes its shape or has recesses along the production direction P and thus also along the longitudinal direction L of the plastic fabric bags to be manufactured.
  • the coating 3 is thus glued onto the fabric 2 in the form of rectangular sheets of film, the inclined connecting seams 9 'to be formed only subsequently being indicated.
  • a connecting seam 9, 9 'in only a part of the coating 3 can also be provided without restriction in the head region of a plastic fabric bag.
  • the coating 3 is applied as a wider strip running in the transverse direction Q, the then in the Fig. 2 indicated structures are only subsequently formed by the shape of a heat sealing tool.
  • the Fig. 5 finally shows a plastic fabric bag with a bag wall, which, as described above, has a layer of a fabric 2 made of plastic tapes, the fabric 2 being exposed in sections on an inside of the plastic fabric bag and being provided with a coating 3 made of plastic in sections, with the coating 3 against one another opposite surfaces of the bag wall are connected along a plurality of connecting seams 9, 9 '.
  • a connecting seam 9 closes the plastic fabric bag along a transverse direction Q.
  • the connecting seam 9 has a step 10 in the transverse direction Q, the height of the connecting seam 9 determined along the longitudinal direction L changing on the step 10.
  • the connecting seam 9 has a first length l 1 in a longitudinal direction L at a first connecting seam section 9a, starting from a lateral bag edge 11 running in the longitudinal direction L, and a greater length l 2 at a second connecting seam section 9b adjoining the step 10.
  • the width of the connecting seam 9 changes at the step 10 along the course of the connecting seam 9.
  • first, narrower connecting seam section 9a runs obliquely and is also provided with an angled portion 12. Due to the smaller width of the first connecting seam section 9a, this can be pulled open by a user, while the second connecting seam section 9b ensures a secure closure of the plastic fabric bag. In order to be able to pull open the first seam section 9a, a user can grip the first side fold 6a and pull it outwards.
  • the plastic fabric bag can also have a handle opening 13 on its upper bag edge, wherein the coating 3 on the handle opening 13 can optionally be left out.
  • the coating 3 can also be coated with an Fig. 5 indicated coating pattern 14 are applied to the surfaces to be coated.
  • the structure of the connecting seams 9, 9 'shown shows that this structure can be precisely specified by the application of the coating, in particular if a connecting seam 9, 9' or several connecting seams 9, 9 'are formed on the entire surface of the coating 3.
  • connecting seams 9, 9 ′ it is also possible for the connecting seams 9, 9 ′ to be produced only on part of the coating 3. The advantage then arises that somewhat larger areas are coated when the coating is applied can without having to pay particular attention to accuracy. With regard to the shape of the connecting seams 9, 9 ', there are usually several possible variations in the course of such a procedure.
  • Fig. 5 To be able to grip the first side fold 6a more easily, this can be done according to the Fig. 6 also be designed such that it extends beyond the front surface 5a and the rear surface 5b or at least the area of the front surface 5a and the rear surface 5b adjoining the first side fold 6a.
  • a notch 15 can also be provided in the front surface 5a and the rear surface 5b adjacent to the first side fold 6a in order to be able to grip the side fold 6a more easily.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)

Description

Die Erfindung betrifft das technische Gebiet von Kunststoffgewebebeuteln, welche eine Schicht aus einem Gewebe aus Kunststoffbändchen aufweisen, wobei das Gewebe aus Kunststoffbändchen an einer Innenseite des Beutels abschnittsweise freiliegt und abschnittsweise mit einer Beschichtung aus Kunststoff versehen ist.The invention relates to the technical field of plastic fabric bags which have a layer of a fabric made of plastic tapes, the fabric made of plastic tapes being partially exposed on an inside of the bag and partially provided with a coating made of plastic.

Konkret betrifft die Erfindung ein Verfahren zur Herstellung eines Kunststoffgewebebeutels, wobei entlang einer Produktionsrichtung eine flachliegende Materialbahn zugeführt wird, welche an einer ersten, üblicherweise oben liegenden Seite ein dort freiliegendes Gewebe aus Kunststoffbändchen aufweist, wobei die Materialbahn senkrecht zu der Produktionsrichtung entlang einer Querrichtung gegenüberliegende, sich jeweils über 10 % der Breite der Materialbahn erstreckende Randbereiche und dazwischen einen Mittelabschnitt aufweist, wobei die Materialbahn mit einem entlang der Produktionsrichtung wiederkehrenden Muster an der ersten Seite der Materialbahn lediglich bereichsweise mit einer Beschichtung in Form einer Folie oder in Form eines flüssigen Kunststoffes versehen wird, wobei die Materialbahn zu einem Materialschlauch umgeformt wird und wobei zur Bildung einzelner Kunststoffgewebebeutel Stücke von dem Materialschlauch abgetrennt, befüllt und verschlossen werden.Specifically, the invention relates to a method for producing a plastic fabric bag, wherein a flat material web is fed along a production direction, which has a fabric made of plastic tapes exposed there on a first, usually upper side, the material web lying perpendicular to the production direction along a transverse direction, each has edge regions extending over 10% of the width of the material web and a middle section therebetween, the material web being provided with a pattern in the form of a film or in the form of a liquid plastic on the first side of the material web with a pattern recurring along the production direction , wherein the material web is formed into a material tube and wherein pieces are separated from the material tube, filled and sealed to form individual plastic fabric bags.

Kunststoffgewebebeutel zeichnen sich durch gute Funktionseigenschaften, insbesondere eine hohe Tragfähigkeit aus. In der Regel wird das Gewebe aus Kunststoffbändchen mit einer Polymerfolie verbunden, welche die Außenseite des Kunststoffgewebebeutels bildet. Durch die außen liegende Polymerfolie werden ein hochwertiges Erscheinungsbild sowie eine Abdichtung der Beutelwand erreicht. Des Weiteren werden die einzelnen Bändchen des Gewebes zueinander fixiert, so dass diese sich nicht verschieben können. Das Gewebe ist vorzugsweise aus Polypropylen gebildet.Plastic fabric bags are characterized by good functional properties, especially a high load-bearing capacity. As a rule, the fabric made of plastic tapes is connected to a polymer film, which forms the outside of the plastic fabric bag. The polymer film on the outside creates a high-quality appearance and seals the bag wall. Furthermore, the individual ribbons of the fabric fixed to each other so that they cannot move. The fabric is preferably made of polypropylene.

Das Gewebe und die Polymerfolie an der Außenseite sind flächig miteinander verbunden und bilden einen festen Kunststoffgewebeverbund. Die Polymerfolie kann als separate Folie vorgefertigt und mit dem Gewebe kaschiert werden oder auch auf das Gewebe aufextrudiert werden.The fabric and the polymer film on the outside are connected to each other over a large area and form a firm plastic fabric bond. The polymer film can be prefabricated as a separate film and laminated to the fabric or extruded onto the fabric.

Grundsätzlich ist es möglich, auch an der Beutelinnenseite flächig eine Beschichtung, beispielsweise in Form einer Folie, vorzusehen, wodurch jedoch die Material- und Herstellungskosten deutlich steigen.In principle, it is also possible to provide a surface coating, for example in the form of a film, on the inside of the bag, but this increases the material and manufacturing costs significantly.

Wenn das Gewebe an der Beutelinnenseite nicht mit einer Beschichtung versehen ist, wird der Kunststoffgewebebeutel üblicherweise durch Klebebänder verschlossen, weil das Gewebe aus Kunststoffbändchen nicht zuverlässig und dicht heißsiegelbar ist.If the fabric on the inside of the bag is not provided with a coating, the plastic fabric bag is usually closed by adhesive tapes because the fabric made of plastic tapes is not reliable and cannot be heat-sealed.

Ein gattungsgemäßes Verfahren zur Herstellung eines Kunststoffgewebebeutels sowie ein gattungsgemäßer Kunststoffgewebebeutel sind aus der DE 10 2011 080 462 A1 bekannt.A generic method for producing a plastic fabric bag and a generic plastic fabric bag are from the DE 10 2011 080 462 A1 known.

Um einen Kunststoffgewebebeutel auch durch Heißsiegelungen verschließen zu können, ohne das gesamte Gewebe mit einer Beschichtung zu versehen, wird eine Beschichtung lediglich in Form von Streifen aufgebracht, die bei der flachliegenden Materialbahn in Querrichtung verlaufen. Die Streifen erstrecken sich mit einer gleichbleibenden Streifenbreite - also einer gleichbleibenden Länge in Produktionsrichtung - über nahezu die gesamte Breite, wobei lediglich an den äußeren Randbereichen die Beschichtung entweder ausgespart ist oder in eine entlang der Produktionsrichtung streifenförmig durchgehende Beschichtung übergeht.In order to be able to also seal a plastic fabric bag by means of heat seals without providing the entire fabric with a coating, a coating is only applied in the form of strips which run in the transverse direction in the case of the flat material web. The strips extend with a constant strip width - that is, a constant length in the direction of production - over almost the entire width, with only the coating on the outer edge areas either being recessed or changes into a continuous coating along the production direction.

Durch die in Querrichtung verlaufende Beschichtung kann eine Heißsiegelnaht erzeugt werden, um den Kunststoffgewebebeutel leicht verschließen zu können. Es ergibt sich der Vorteil, dass die Beschichtung nur dort aufgebracht wird, wo nachfolgend die Versiegelung erfolgen soll, wodurch sich eine erhebliche Materialeinsparung ergibt. Wie auch bei einem an seiner Innenseite vollständig mit einer Beschichtung versehenen und versiegelten Kunststoffgewebebeutel muss das Öffnen in der Regel mit einer Schere erfolgen, weil das Gewebe aus Kunststoffbändchen nur schwer zerrissen werden kann.Due to the coating running in the transverse direction, a heat seal seam can be produced in order to be able to easily seal the plastic fabric bag. This has the advantage that the coating is only applied where the sealing is subsequently to take place, which results in considerable material savings. As with a plastic fabric bag that is completely coated and sealed on the inside, it must usually be opened with scissors because the fabric made of plastic tapes is difficult to tear.

Aus der DE 44 31 742 A1 ist ein Faltenbeutel aus Papier bekannt, wobei das Papier mit einer heißsiegelbaren Beschichtung versehen ist, so dass bei der Bildung des Beutels diese Beschichtung nach einem Falten der Bahn aus Papier mit sich selbst verbunden werden kann.From the DE 44 31 742 A1 a paper folding bag is known, the paper being provided with a heat-sealable coating, so that when the bag is formed, this coating can be connected to itself after the paper web has been folded.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine besonders kostengünstige Herstellung eines Kunststoffgewebebeutels anzugeben, der sich durch verbesserte Funktionseigenschaften auszeichnet.The present invention has for its object to provide a particularly cost-effective production of a plastic fabric bag, which is characterized by improved functional properties.

Gegenstand der Erfindung und Lösung der Aufgabe ist ein Verfahren zur Herstellung eines Kunststoffgewebebeutels nach Patentanspruch 1.The object of the invention and the solution to the problem is a method for producing a plastic fabric bag according to claim 1.

Ausgehend von dem eingangs beschriebenen Verfahren ist erfindungsgemäß vorgesehen, dass sich an dem Mittelabschnitt der Auftrag der Beschichtung in Querrichtung ändert. Der vorliegenden Erfindung liegt in diesem Zusammenhang die Erkenntnis zugrunde, dass durch den sich in Querrichtung an dem Mittelabschnitt ändernden Auftrag sowohl erhebliche Materialeinsparungen als auch erweiterte Funktionalitäten realisiert werden können. Der Auftrag der Beschichtung kann sich in Menge, Verlauf und/oder Form verändern. Insbesondere können Aussparungen und Stufen vorhanden sein. Der Anteil der mit der Beschichtung versehenen Fläche beträgt bezogen auf die Gesamtfläche der Materialbahn üblicherweise weniger als 30 %, insbesondere weniger als 25 %, beispielsweise zwischen 5 % und 20 %.Based on the method described in the introduction, it is provided according to the invention that the application of the coating changes in the transverse direction on the central section. In this context, the present invention is based on the knowledge that the order that changes in the transverse direction on the central section both saves considerable material as well as extended functionalities can be realized. The application of the coating can change in quantity, course and / or shape. In particular, there may be recesses and steps. The proportion of the surface provided with the coating is usually less than 30%, in particular less than 25%, for example between 5% and 20%, based on the total surface of the material web.

Im Rahmen der Erfindung ist als Beschichtung eine Folie oder ein Kunststoff vorgesehen, der in einem flüssigen Zustand aufgebracht wird. Der Kunststoffkann dabei insbesondere auch zähflüssig sein und wahlweise heiß oder kalt aufgebracht werden. So ist es beispielsweise möglich, eine Polymerschmelze oder einen Heißklebstoff schmelzflüssig aufzuextrudieren oder durch geeignete Transferverfahren, beispielsweise als Transferwalze, aufzubringen.In the context of the invention, a film or a plastic is provided as the coating, which is applied in a liquid state. The plastic can in particular also be viscous and can be applied hot or cold. For example, it is possible to melt-melt a polymer melt or a hot-melt adhesive or to apply it by means of suitable transfer processes, for example as a transfer roller.

Grundsätzlich ist es auch denkbar, einen Siegellack kalt aufzubringen, der zunächst trocknet und dann nachfolgend noch heißsiegelbar ist. Des Weiteren kann auch ein Klebstoff aufgebracht werden, der dann nachfolgend direkt bei der Bildung des Folienschlauches eine Verbindung bewirkt, wobei jedoch bevorzugt eine Beschichtung vorgesehen wird, welche erst für ein nachträgliches Heißsiegeln vorgesehen ist.In principle, it is also conceivable to apply a sealing wax cold, which first dries and then can subsequently be heat-sealed. Furthermore, an adhesive can also be applied, which then causes a connection directly when the film tube is formed, but preferably a coating is provided which is only intended for subsequent heat sealing.

Der vorliegenden Erfindung liegt in diesem Zusammenhang auch die Erkenntnis zugrunde, dass die Beschichtung nach der Bildung des Materialschlauches nicht zwingend mit sich selbst verbunden werden muss, also nicht an den beiden in dem Materialschlauch miteinander zu verbindenden Flächen vorliegen muss. Um eine Verbindung zu erreichen, ist es nämlich ausreichend, wenn die Beschichtung lediglich an einer der beiden miteinander zu verbindenden Flächen vorhanden ist, wobei dann die vorzugsweise durch Temperaturzufuhr bei einem Heißsiegeln verflüssigte Beschichtung auch an der zunächst noch nicht beschichteten Fläche eine innige Verbindung mit dem Gewebe eingehen kann.In this context, the present invention is also based on the knowledge that the coating does not necessarily have to be connected to itself after the material hose has been formed, that is, it does not have to be present on the two surfaces to be connected to one another in the material hose. In order to achieve a connection, it is in fact sufficient if the coating is only present on one of the two surfaces to be connected to one another, with the coating, which is preferably liquefied by the supply of temperature during heat sealing, then also on the first non-coated surface can form an intimate connection with the tissue.

Wenn beispielsweise ein einfacher Kunststoffgewebebeutel in der Form eines Kissens gefertigt wird, ist es ausreichend, wenn sich die Beschichtung in Form eines Streifens lediglich über etwa die Hälfte der Materialbahn in Querrichtung erstreckt. Wenn dagegen der Kunststoffgewebebeutel als Seitenfaltenbeutel ausgeführt ist, kann die Beschichtung als segmentierter Streifen ausgeführt sein, wobei die Streifensegmente so angeordnet sind, dass bei dem flachliegenden Seitenfaltenbeutel bei sämtlichen aufeinanderliegenden, miteinander zu verbindenden Flächen zumindest eine Seite mit der Beschichtung versehen ist.If, for example, a simple plastic fabric bag is manufactured in the form of a pillow, it is sufficient if the coating in the form of a strip only extends in the transverse direction over approximately half of the material web. If, on the other hand, the plastic fabric bag is designed as a side-gusset bag, the coating can be designed as a segmented strip, the strip segments being arranged in such a way that, in the case of the flat-lying side-gusset bag, at least one side is provided with the coating on all surfaces which are to be connected to one another.

Vor diesem Hintergrund ist also gemäß der Erfindung vorgesehen, dass die Beschichtung in Form von in Querrichtung verlaufenden, gegebenenfalls segmentierten Streifen aufgebracht ist, wobei die Streifen sich nur über 40 % bis 60 % der Breite erstrecken. Bei einem segmentierten Streifen bezieht sich diese Angabe auf die Gesamtlänge sämtlicher Streifensegmente.Against this background, it is therefore provided according to the invention that the coating is applied in the form of crosswise, optionally segmented strips, the strips only extending over 40% to 60% of the width. In the case of a segmented strip, this information relates to the total length of all strip segments.

Gemäß einem weiteren Aspekt der vorliegenden Erfindung ist vorgesehen, dass die Beschichtung entlang der Querrichtung einen ersten Abschnitt und zumindest einen daran anschließenden zweiten Abschnitt aufweist, wobei der erste Abschnitt in Produktionsrichtung gesehen eine erste Länge l1 und der zweite Abschnitt eine größere Länge l2 aufweist. Auch eine solche Beschichtung verläuft vorzugsweise gerade oder schräg in Querrichtung. Entlang des Verlaufes der Beschichtung, also vorzugsweise in Querrichtung, ändert sich also die Streifenbreite. Dadurch ist es möglich, die Festigkeit einer mit Hilfe der Beschichtung erzeugten Verbindung lokal zu variieren. Beispielsweise kann im Rahmen der beschriebenen Ausgestaltung ausgehend von einem Beutelrand ein Bereich vorgesehen werden, der nur durch eine schmale Verbindungsnaht verschlossen ist, wobei der Kunststoffgewebebeutel dann dort auch von Hand aufgezogen werden kann, während benachbart dazu die aufeinanderliegenden Flächen durch eine breite Verbindungsnaht verbunden und damit dauerhaft fixiert sind.According to a further aspect of the present invention, it is provided that the coating has a first section and at least one second section adjoining it in the transverse direction, the first section having a first length l 1 and the second section having a greater length l 2 when viewed in the production direction . Such a coating also preferably runs straight or obliquely in the transverse direction. The stripe width changes along the course of the coating, that is to say preferably in the transverse direction. This makes it possible to locally vary the strength of a connection produced using the coating. For example, within the scope of the described configuration, an area can be provided starting from a bag edge, which only has one narrow connecting seam is closed, the plastic fabric bag then being able to be opened there by hand, while adjacent to it the surfaces lying on one another are connected by a wide connecting seam and are thus permanently fixed.

Konkrete bevorzugte Ausgestaltungen des Kunststoffgewebebeutels werden nachfolgend weiter erläutert.Specific preferred configurations of the plastic fabric bag are explained further below.

Erfindungsgemäß wird ausgehend von einer flachliegenden Materialbahn ein Materialschlauch gebildet, wobei einzelne Kunststoffgewebebeutel dann aus Stücken des Materialschlauches hergestellt werden. Entsprechend erfolgt die Beschichtung entlang der Produktionsrichtung mit einem wiederkehrenden Muster. Unabhängig davon kann in den zu beschichteten Bereichen selbst die Beschichtung in einem flüssigen Zustand mit einem Beschichtungsmuster aufgebracht werden. Damit ist gemeint, dass in den zu beschichteten Bereichen keine völlig durchgängige Schicht vorhanden ist. Beispielsweise kann ein Beschichtungsmuster aus sich kreuzenden Streifen vorgesehen sein, welche aufgrund ihrer Struktur eine zuverlässige und dichte Verbindung ermöglichen, wobei jedoch durch ein solches Beschichtungsmuster eine weitere Materialeinsparung erreicht werden kann.According to the invention, a material tube is formed starting from a flat material web, individual plastic fabric bags then being produced from pieces of the material tube. Accordingly, the coating is carried out along the production direction with a recurring pattern. Irrespective of this, even the coating can be applied in a liquid state with a coating pattern in the areas to be coated. This means that there is no completely continuous layer in the areas to be coated. For example, a coating pattern of intersecting strips can be provided, which due to their structure enable a reliable and tight connection, but a further material saving can be achieved by such a coating pattern.

Das erfindungsgemäße Verfahren kann nicht nur dazu genutzt werden, um bei einem Kunststoffgewebebeutel eine Verschlussnaht zu erzeugen. Es ist vielmehr auch möglich mit Hilfe der Beschichtung Eckschweißungen im Bereich eines Beutelbodens zu erzeugen oder die Aufnahme von weiteren Funktionselementen wie Wiederverschlüssen, Ventilen oder dergleichen in dem Beutel zu ermöglichen, wodurch die Einsatzmöglichkeiten des Kunststoffgewebebeutels im Rahmen der Erfindung erheblich erweitert werden.The method according to the invention can not only be used to produce a closure seam in a plastic woven bag. Rather, it is also possible to use the coating to produce corner welds in the area of a bag bottom or to enable the inclusion of further functional elements such as reclosures, valves or the like in the bag, thereby considerably expanding the possible uses of the plastic fabric bag in the context of the invention.

Wenn die Beschichtung nachträglich zur Erzeugung einer Verbindungsnaht aufgeschmolzen wird, ergeben sich im Rahmen der Erfindung zwei unterschiedliche Möglichkeiten der Verfahrensführung. So ist es möglich, dass die gesamte Beschichtung aufgeschmolzen wird und eine Verbindungsnaht bildet. Hierzu kann beispielsweise ein Heißsiegelwerkzeug vorgesehen werden, welches größer als die Beschichtung ist, so dass diese in ihrer gesamten Fläche aufgeschmolzen wird. Im Rahmen einer solchen Verfahrensführung wird die Form der Verbindungsnaht durch den Auftrag und die Form der Beschichtung vorgegeben.If the coating is subsequently melted to produce a connecting seam, there are two different options for carrying out the process within the scope of the invention. So it is possible that the entire coating is melted and forms a connecting seam. For this purpose, a heat sealing tool can be provided, for example, which is larger than the coating, so that it is melted over its entire surface. In the course of such a procedure, the shape of the connecting seam is predetermined by the application and the shape of the coating.

Gemäß einer alternativen Ausgestaltung der Erfindung ist vorgesehen, dass die zumindest eine Verbindungsnaht sich nur in einem Teil der Beschichtung erstreckt. Im Rahmen einer solchen Ausgestaltung kann die Beschichtung an einer größeren Fläche vorgesehen werden, ohne dass dabei präzise Vorgaben für die Form der Beschichtung eingehalten werden müssen. Wenn beispielsweise eine Folie als Beschichtung vorgesehen ist, kann diese eine rechteckige Form aufweisen, wobei dann der genaue Verlauf der Verbindungsnaht erst bei dem Aufschmelzen einer solchen Folie unter Wärmezufuhr festgelegt wird.According to an alternative embodiment of the invention, it is provided that the at least one connecting seam extends only in part of the coating. In the context of such a configuration, the coating can be provided on a larger area without having to adhere to precise specifications for the shape of the coating. If, for example, a film is provided as the coating, it can have a rectangular shape, the precise course of the connecting seam then being determined only when such a film is melted with the application of heat.

Wie bereits zuvor beschrieben, kann als Beschichtung eine Kunststoffschmelze oder ein handelsüblicher Schmelzklebstoff vorgesehen sein, wobei eine klare Unterscheidung zwischen einem üblichen Polymermaterial und einem Schmelzklebstoff im Rahmen der Erfindung nicht notwendig ist. Als Kunststoffschmelze kommen insbesondere Polyolefine wie Polyethylen (PE), PE-Copolymere, Polypropylen (PP) oder PP-Copolymere in Betracht, wobei insbesondere niedrigschmelzende Kunststoffe bevorzugt sind, die mit Hilfe von Metallocen-Katalysatoren polymerisiert sein können. Bevorzugt ist vorgesehen, dass bei dem Aufbringen der Beschichtung sowie nachfolgend bei einem bevorzugten thermischen Aufschmelzen der Beschichtung das Gewebe allenfalls oberflächig angeschmolzen wird, damit die für die Tragfähigkeit des Gewebes ausschlaggebende Orientierung der Moleküle in den einzelnen Kunststoffbändern nicht verloren geht. Bei dem Aufbringen der Beschichtung im schmelzflüssigen Zustand und auch bei der Verarbeitung ist eine gute Fließfähigkeit von Vorteil, damit die Beschichtung auch in die Gewebestruktur eindringen kann.As already described above, a plastic melt or a commercially available hot melt adhesive can be provided as the coating, a clear distinction between a conventional polymer material and a hot melt adhesive not being necessary within the scope of the invention. Suitable plastic melts are, in particular, polyolefins such as polyethylene (PE), PE copolymers, polypropylene (PP) or PP copolymers, low-melting plastics which can be polymerized with the aid of metallocene catalysts being particularly preferred. It is preferably provided that the fabric is applied when the coating is applied and subsequently when the coating is thermally melted at most, it is melted on the surface so that the orientation of the molecules in the individual plastic bands, which is crucial for the load-bearing capacity of the fabric, is not lost. When the coating is applied in the molten state and also during processing, good flowability is advantageous, so that the coating can also penetrate into the fabric structure.

Es ergibt sich im Zusammenhang mit dem Gewebe auch der Vorteil, dass aufgeschmolzenes Material in die Zwischenräume des Gewebes eindringen und so eine besonders zuverlässige Verbindung bewirken kann.In connection with the fabric, there is also the advantage that melted material can penetrate into the interstices of the fabric and can thus bring about a particularly reliable connection.

Für eine Folie als Beschichtung kommen insbesondere Polyolefine, insbesondere Polyethylen in Betracht, wobei eine solche Folie vorzugsweise mit einem Klebstoff, insbesondere einem Haftklebstoff auf dem Gewebe aus Kunststoffbändchen befestigt werden kann.Polyolefins, in particular polyethylene, are particularly suitable for a film as a coating, such a film preferably being able to be attached to the fabric made of plastic tapes using an adhesive, in particular a pressure sensitive adhesive.

Herstellbar mittels des erfindungsgemäßen Verfahrens ist auch ein Kunststoffgewebebeutel mit einer Beutelwand, die eine Schicht aus einem Gewebe aus Kunststoffbändchen aufweist, wobei an einer Innenseite des Beutels das Gewebe abschnittsweise freiliegt und abschnittsweise mit einer Beschichtung aus Kunststoff versehen ist, wobei mit der Beschichtung einander gegenüberliegende Flächen der Beutelwand entlang zumindest einer Verbindungsnaht verbunden sind und wobei die Verbindungsnaht einen Kopfbereich entlang einer Querrichtung verschließt.The method according to the invention can also be used to produce a plastic fabric bag with a bag wall which has a layer of a fabric made of plastic tapes, the fabric being exposed in sections on an inside of the bag and being provided with a plastic coating in sections, with the coating being opposite surfaces the bag wall are connected along at least one connecting seam and the connecting seam closes a head region along a transverse direction.

Gemäß einer ersten Variante einer solchen Ausführungsform ist vorgesehen, dass die Verbindungsnaht in Querrichtung zumindest eine Stufe aufweist, wobei sich an der Stufe die entlang einer Längsrichtung des Kunststoffgewebebeutels bestimmte Höhe der Verbindungsnaht ändert. In Bezug auf die Verbindungsnaht ergibt sich also vor und nach der Stufe eine unterschiedliche Breite der Verbindungsnaht entlang ihres Verlaufes.According to a first variant of such an embodiment, it is provided that the connecting seam has at least one step in the transverse direction, the height of the connecting seam determined along a longitudinal direction of the plastic fabric bag changing at the step. Regarding the seam So there is a different width of the connecting seam along its course before and after the step.

Wie zuvor beschrieben kann dadurch erreicht werden, dass die Verbindungsnaht an dem ersten Verbindungsnahtabschnitt leichter aufgerissen werden kann als an dem zweiten Verbindungsnahtabschnitt. Durch eine geeignete Länge der Verbindungsnaht entlang der Längsrichtung, d. h. also einer geeigneten Breite der Verbindungsnaht entlang ihres Verlaufes können also in Querrichtung des Beutels unterschiedlich fest verbundene Bereiche erzeugt werden.As described above, it can be achieved that the connecting seam on the first connecting seam section can be torn open more easily than on the second connecting seam section. By a suitable length of the connecting seam along the longitudinal direction, i. H. that is, a suitable width of the connecting seam along its course can be produced in the transverse direction of the bag, areas of different strength.

Zusätzlich und alternativ kann der erste Verbindungsnahtabschnitt auch gegenüber der Längs- und Querrichtung schräg verlaufen und/oder eine Abwinklung aufweisen. Gerade wenn an dem ersten Verbindungsnahtabschnitt ein Aufpeelen, das heißt ein Aufreißen der Verbindungsnaht, ermöglicht werden soll, kann ein schräger Verlauf oder eine Abwinklung hinsichtlich der Krafteinleitung bei dem Aufreißen von Vorteil sein.Additionally and alternatively, the first connecting seam section can also run obliquely with respect to the longitudinal and transverse directions and / or have an angled portion. Precisely when peeling, that is to say tearing open, of the connecting seam is to be made possible at the first connecting seam section, an oblique course or an angling with regard to the introduction of force can be advantageous during the tearing open.

Gemäß einer bevorzugten Ausgestaltung ist der Kunststoffgewebebeutel als Seitenfaltenbeutel ausgeführt, so dass dann die Beutelwand eine Frontfläche, eine Rückfläche sowie eine erste Seitenfalte und eine zweite Seitenfalte bildet, wobei die beiden Seitenfalten die Frontfläche und die Rückfläche miteinander verbinden.According to a preferred embodiment, the plastic fabric bag is designed as a side gusset bag, so that the bag wall then forms a front surface, a back surface and a first side gusset and a second side gusset, the two side gussets connecting the front surface and the back surface to one another.

Bei einer Ausgestaltung des Kunststoffgewebebeutels als Seitenfaltenbeutel befindet sich die zuvor beschriebene Stufe vorzugsweise an einem Rand der ersten, zwischen die Frontfläche und die Rückfläche eingelegten Seitenfalte. Es kann dann vorgesehen sein, dass der Seitenfaltenbeutel dadurch geöffnet wird, dass die erste zunächst zwischen die Frontfläche und die Rückfläche eingelegte Seitenfalte nach außen gezogen und dadurch die Verbindungsnaht an dem ersten Verbindungsnahtabschnitt aufgerissen wird.In the case of an embodiment of the plastic fabric bag as a side gusset bag, the step described above is preferably located on an edge of the first side gusset inserted between the front surface and the rear surface. It can then be provided that the side gusset bag is opened by first moving the first between the front surface and the rear surface inserted side gusset pulled outwards and thereby the connecting seam on the first connecting seam section is torn open.

Um ein solches Aufreißen zu erleichtern, kann vorgesehen sein, dass die erste Seitenfalte an dem Kopfbereich über die Frontfläche und die Rückfläche vorsteht. Die erste Seitenfalte kann dann leicht von einem Benutzer gegriffen und nach außen gezogen werden.In order to facilitate such a tearing open, it can be provided that the first side fold protrudes at the head region over the front surface and the rear surface. The first gusset can then be easily gripped by a user and pulled outwards.

Zusätzlich oder alternativ kann in der Frontfläche und der Rückfläche angrenzend zu der ersten Seitenfalte eine Einkerbung vorgesehen sein, wobei dann durch die Einkerbung ein Benutzer die Seitenfalte leichter erfassen und nach außen ziehen kann.Additionally or alternatively, a notch can be provided in the front surface and the rear surface adjacent to the first side fold, in which case a user can then grasp the side fold more easily and pull it outwards.

Die Erfindung wird im Folgenden anhand einer lediglich einer Ausführungsbeispiel darstellenden Zeichnung erläutert. Es zeigen:

Fig. 1
eine flachliegende Materialbahn, die lediglich bereichsweise mit einer Beschichtung versehen ist,
Fig. 2 bis Fig. 4
die Materialbahn gemäß der Fig. 1 mit alternativen Ausgestaltungen der Beschichtung, wobei die Ausgestaltungen der Fig. 2 und Fig. 4 nicht erfindungsgemäß sind.
Fig. 5
ein flachgelegter Kunststoffgewebebeutel,
Fig. 6 und Fig. 7
optionale Detailausgestaltungen des in Fig. 5 dargestellten Kunststoffgewebebeutels.
The invention is explained below on the basis of a drawing which represents only one exemplary embodiment. Show it:
Fig. 1
a flat material web, which is only partially coated with a coating,
2 to 4
the material web according to the Fig. 1 with alternative configurations of the coating, the configurations of the Fig. 2 and Fig. 4 are not according to the invention.
Fig. 5
a flat plastic tissue bag,
6 and 7
optional detailed designs of the in Fig. 5 shown plastic fabric bag.

Die Fig. 1 zeigt eine Materialbahn 1 für die Herstellung eines Kunststoffgewebebeutels. Die Materialbahn 1 wird entlang einer Produktionsrichtung P geführt, wobei die Materialbahn 1 an der in der Fig. 1 oben liegenden Seite ein zunächst freiliegendes Gewebe 2 aus Kunststoffbändchen aufweist. Die Materialbahn 1 ist auf dem Gewebe 2 lediglich abschnittsweise mit einer Beschichtung 3 versehen.The Fig. 1 shows a material web 1 for the production of a plastic fabric bag. The material web 1 is guided along a production direction P, the material web 1 at the in the Fig. 1 has an initially exposed fabric 2 made of plastic tapes. The material web 1 is provided on the fabric 2 only in sections with a coating 3.

Als Beschichtung 3 können beispielsweise aufgeklebte Folien oder ein flüssig aufgebrachter Kunststoff vorgesehen sein. Besonders bevorzugt wird die Beschichtung 3 als schmelzflüssiger Kunststoff aufgebracht, wobei dieser beispielsweise zähflüssig aufextrudiert oder mit einer Transferwalze appliziert werden kann.For example, glued-on films or a liquid-applied plastic can be provided as coating 3. The coating 3 is particularly preferably applied as a molten plastic, it being possible for example to extrude it viscously or to apply it with a transfer roller.

Die Materialbahn 1 wird nachfolgend in bekannter Weise zu einem Materialschlauch umgeformt. Gemäß dem dargestellten Ausführungsbeispiel soll aus der Materialbahn 1 ein Seitenfaltenschlauch zur Bildung von Seitenfaltenbeuteln erzeugt werden, wobei in der noch flachliegenden Materialbahn 1 die Knicklinien 4, 4' angedeutet sind. Eine erste Gruppe von Knicklinien 4 zeigt den Übergang von einer Frontfläche 5a bzw. einer Rückfläche 5b zu den Seitenfalten 6a, 6b an, während an einer zweiten Gruppe von Knicklinien 4' die beiden Seitenfalten 6a, 6b jeweils auf sich selbst gefaltet sind. An den Rändern der Materialbahn 1 wird bei der Herstellung eine Flossennaht gebildet, weshalb dort auch ein Beschichten vorgesehen sein kann.The material web 1 is subsequently formed into a material hose in a known manner. According to the exemplary embodiment shown, a side gusseted tube is to be produced from the material web 1 to form side gusset bags, the kink lines 4, 4 'being indicated in the material web 1 which is still lying flat. A first group of fold lines 4 indicates the transition from a front surface 5a or a rear surface 5b to the side folds 6a, 6b, while on a second group of fold lines 4 'the two side folds 6a, 6b are each folded onto themselves. A fin seam is formed on the edges of the material web 1 during manufacture, which is why a coating can also be provided there.

Aus der Fig. 1 ist ersichtlich, dass die Beschichtung 3 sich außerhalb der Ränder auch an einem Mittelabschnitt der Materialbahn 1 in Querrichtung Q ändert. Konkret ist die Beschichtung 3 in Form eines in Querrichtung Q verlaufenden, segmentierten Streifens 7 gebildet, wobei sich der Streifen 7 mit seinen Segmenten über etwas mehr als 50 % der Breite der Materialbahn 1 in Querrichtung Q erstreckt. Wenn die Materialbahn 1 entlang der Knicklinien 4, 4' zu einem Seitenfaltenschlauch umgeformt wird, liegen auf Höhe der Beschichtung 3 über die gesamte Breite des Seitenfaltenschlauches dann Flächen einander gegenüber, von denen zumindest eine mit einer Beschichtung 3 versehen ist, so dass bei einem Aufschmelzen der Beschichtung 3 ein dichter Verschluss erreicht werden kann.From the Fig. 1 it can be seen that the coating 3 also changes outside the edges at a central section of the material web 1 in the transverse direction Q. Specifically, the coating 3 is formed in the form of a segmented strip 7 running in the transverse direction Q, the strip 7 with its segments covering a little more than 50% of the width of the material web 1 in Cross direction Q extends. If the material web 1 is formed into a gusseted tube along the kink lines 4, 4 ', then, at the level of the coating 3 over the entire width of the gusseted tube, surfaces lie opposite one another, at least one of which is provided with a coating 3, so that when it melts the coating 3 a tight seal can be achieved.

Die Beschichtung 3 erfüllt also den Zweck eines lediglich einschichtig vorhandenen Klebstoffes, der dann die gegenüberliegenden Flächen des Gewebes 2 verbindet. Die dargestellte Ausführungsform unterscheidet sich damit also von einer Ausgestaltung, bei der gemäß dem Stand der Technik ein durchgehender Streifen als Beschichtung vorgesehen wird, der dann lediglich mit sich selbst verbunden wird.The coating 3 thus fulfills the purpose of an adhesive which is only present in one layer and which then connects the opposite surfaces of the fabric 2. The embodiment shown thus differs from an embodiment in which, according to the prior art, a continuous strip is provided as a coating, which is then only connected to itself.

In der Fig. 1 ist auch eine in Querrichtung Q verlaufende Trennstelle 8 angedeutet, an der dann einzelne Stücke von dem Materialschlauch abgetrennt werden. Bei einem Durchtrennen des Materialschlauches an der Trennstelle 8 kann mit der dort durchtrennten Beschichtung 3 an aufeinanderfolgenden Kunststoffgewebebeuteln eine Kopfnaht bzw. eine Bodennaht erzeugt werden.In the Fig. 1 a separation point 8 running in the transverse direction Q is also indicated, at which individual pieces are then separated from the material hose. When the material hose is severed at the separation point 8, a top seam or a bottom seam can be produced with the coating 3 severed there on successive plastic fabric bags.

Die Fig. 2 zeigt exemplarisch eine nicht erfindungsgemäße Ausgestaltung, wobei die Beschichtung unterschiedliche Strukturen bildet. Neben einem Streifen 7', der als Bodennaht vorgesehen und gemäß dem Stand der Technik ausgeführt ist, ist für die Bildung einer Verbindungsnaht 9 an einem Kopfbereich des Kunststoffgewebebeutels ein weiterer Streifen 7" vorgesehen, an dem die Beschichtung 3 Stufen 10 aufweist. Die Ausdehnung der Beschichtung 3 entlang der Produktionsrichtung P, welche in dem Ausführungsbeispiel auch einer Längsrichtung L des Kunststoffgewebebeutels entspricht, ändert sich an der Stufe 10. Mit anderen Worten weist der entsprechende Streifen 7" entlang seines Verlaufes einen Bereich mit einer geringeren Streifenbreite auf, der zusätzlich auch noch schräg verläuft. Wie nachfolgend auch im Zusammenhang mit der Fig. 5 beschrieben, kann dadurch erreicht werden, dass der Abschnitt mit einer geringeren Streifenbreite an der ersten Seitenfalte 6a leicht aufgezogen werden kann.The Fig. 2 shows an example of an embodiment not according to the invention, the coating forming different structures. In addition to a strip 7 ′, which is provided as a bottom seam and is designed according to the prior art, a further strip 7 ″ is provided for the formation of a connecting seam 9 on a head region of the plastic fabric bag, on which the coating has 3 steps 10. The extent of the Coating 3 along the production direction P, which in the exemplary embodiment also corresponds to a longitudinal direction L of the plastic fabric bag, changes at step 10. In other words, the corresponding strip 7 "points along its course an area with a smaller stripe width, which also runs obliquely. As also below in connection with the Fig. 5 can be achieved in that the section with a smaller strip width on the first side fold 6a can be easily pulled open.

In der Fig. 2 ist des Weiteren dargestellt, dass mit der lediglich abschnittsweisen Beschichtung 3 auch andere Konturen, wie beispielsweise schräg verlaufende Konturen gebildet werden können, aus denen dann nachfolgend Verbindungsnähte 9' in Form von Eckverbindungen erzeugt werden.In the Fig. 2 it is further shown that the contours 3, which are only in sections, can also be used to form other contours, such as, for example, oblique contours, from which connection seams 9 'in the form of corner connections are then subsequently produced.

Die Fig. 3 zeigt schließlich eine erfindungsgemäße Kombination der Maßnahmen gemäß der Fig. 1 und der Fig. 2, wonach die Beschichtung 3 in Form eines segmentierten Streifens 7'" angeordnet ist, der zusätzlich auch entlang der Produktionsrichtung P und damit auch entlang der Längsrichtung L der zu fertigenden Kunststoffgewebebeutel seine Form ändert oder Aussparungen aufweist.The Fig. 3 finally shows a combination of the measures according to the invention Fig. 1 and the Fig. 2 , After which the coating 3 is arranged in the form of a segmented strip 7 '", which also changes its shape or has recesses along the production direction P and thus also along the longitudinal direction L of the plastic fabric bags to be manufactured.

Bei den Ausführungsformen gemäß der Fig. 1 bis Fig. 3 kann vorgesehen sein, dass an der gesamten Beschichtung Verbindungsnähte 9, 9' erzeugt werden.In the embodiments according to the 1 to 3 it can be provided that connecting seams 9, 9 'are produced on the entire coating.

Es ist aber auch möglich, eine Beschichtung 3 großflächiger aufzubringen und dann die Form der Verbindungsnaht 9, 9' nachträglich durch die Form eines Heißsiegelwerkzeuges oder dergleichen festzulegen.However, it is also possible to apply a coating 3 over a large area and then to subsequently determine the shape of the connecting seam 9, 9 'by means of the shape of a heat sealing tool or the like.

Gemäß der eine nicht erfindungsgemäße Ausgestaltung zeigenden Fig. 4 ist also die Beschichtung 3 in Form von rechteckigen Folienzetteln auf das Gewebe 2 aufgeklebt, wobei die erst nachfolgend zu bildenden schräg verlaufenden Verbindungsnähte 9' angedeutet sind.According to a configuration not according to the invention Fig. 4 the coating 3 is thus glued onto the fabric 2 in the form of rectangular sheets of film, the inclined connecting seams 9 'to be formed only subsequently being indicated.

Die Erzeugung einer Verbindungsnaht 9, 9' in lediglich einem Teil der Beschichtung 3 kann ohne Einschränkung auch im Kopfbereich eines Kunststoffgewebebeutels vorgesehen sein. So kann beispielsweise ausgehend von der Fig. 2 vorgesehen sein, dass die Beschichtung 3 als ein breiter in Querrichtung Q verlaufender Streifen aufgebracht wird, wobei dann die in der Fig. 2 angedeuteten Strukturen lediglich durch die Form eines Heißsiegelwerkzeuges nachträglich gebildet werden.The production of a connecting seam 9, 9 'in only a part of the coating 3 can also be provided without restriction in the head region of a plastic fabric bag. For example, starting from the Fig. 2 it should be provided that the coating 3 is applied as a wider strip running in the transverse direction Q, the then in the Fig. 2 indicated structures are only subsequently formed by the shape of a heat sealing tool.

Die Fig. 5 zeigt schließlich einen Kunststoffgewebebeutel mit einer Beutelwand, die wie zuvor beschrieben eine Schicht aus einem Gewebe 2 aus Kunststoffbändchen aufweist, wobei auf einer Innenseite des Kunststoffgewebebeutels das Gewebe 2 abschnittsweise freiliegt und abschnittsweise mit einer Beschichtung 3 aus Kunststoff versehen ist, wobei mit der Beschichtung 3 aneinander gegenüberliegende Flächen der Beutelwand entlang von mehreren Verbindungsnähten 9, 9' verbunden sind.The Fig. 5 finally shows a plastic fabric bag with a bag wall, which, as described above, has a layer of a fabric 2 made of plastic tapes, the fabric 2 being exposed in sections on an inside of the plastic fabric bag and being provided with a coating 3 made of plastic in sections, with the coating 3 against one another opposite surfaces of the bag wall are connected along a plurality of connecting seams 9, 9 '.

Eine Verbindungsnaht 9 verschließt den Kunststoffgewebebeutel entlang einer Querrichtung Q. Die Verbindungsnaht 9 weist in Querrichtung Q eine Stufe 10 auf, wobei sich an der Stufe 10 die entlang der Längsrichtung L bestimmte Höhe der Verbindungsnaht 9 ändert. Konkret weist die Verbindungsnaht 9 an einem ersten Verbindungsnahtabschnitt 9a ausgehend von einem seitlichen, in Längsrichtung L verlaufenden Beutelrand 11 eine erste Länge l1 in Längsrichtung L und an einem an der Stufe 10 daran anschließenden zweiten Verbindungsnahtabschnitt 9b eine größere Länge l2 auf. Mit anderen Worten ändert sich an der Stufe 10 entlang des Verlaufes der Verbindungnaht 9 die Breite der Verbindungsnaht 9.A connecting seam 9 closes the plastic fabric bag along a transverse direction Q. The connecting seam 9 has a step 10 in the transverse direction Q, the height of the connecting seam 9 determined along the longitudinal direction L changing on the step 10. Specifically, the connecting seam 9 has a first length l 1 in a longitudinal direction L at a first connecting seam section 9a, starting from a lateral bag edge 11 running in the longitudinal direction L, and a greater length l 2 at a second connecting seam section 9b adjoining the step 10. In other words, the width of the connecting seam 9 changes at the step 10 along the course of the connecting seam 9.

Des Weiteren ist zu erkennen, dass der erste, schmalere Verbindungsnahtabschnitt 9a schräg verläuft und auch mit einer Abwinklung 12 versehen ist. Aufgrund der geringeren Breite des ersten Verbindungsnahtabschnittes 9a kann diese von einem Benutzer aufgezogen werden, während der zweite Verbindungsnahtabschnitt 9b einen sicheren Verschluss des Kunststoffgewebebeutels gewährleitet. Um den ersten Verbindungsnahtabschnitt 9a aufziehen zu können, kann ein Benutzer die erste Seitenfalte 6a greifen und nach außen ziehen.Furthermore, it can be seen that the first, narrower connecting seam section 9a runs obliquely and is also provided with an angled portion 12. Due to the smaller width of the first connecting seam section 9a, this can be pulled open by a user, while the second connecting seam section 9b ensures a secure closure of the plastic fabric bag. In order to be able to pull open the first seam section 9a, a user can grip the first side fold 6a and pull it outwards.

In der Fig. 5 ist des Weiteren dargestellt, dass der Kunststoffgewebebeutel an seinem oberen Beutelrand auch eine Grifföffnung 13 aufweisen kann, wobei optional die Beschichtung 3 an der Grifföffnung 13 ausgespart sein kann.In the Fig. 5 it is further shown that the plastic fabric bag can also have a handle opening 13 on its upper bag edge, wherein the coating 3 on the handle opening 13 can optionally be left out.

In der Fig. 5 sind des Weiteren auch Verbindungsnähte 9' in Form von Eckschweißungen dargestellt.In the Fig. 5 Connection seams 9 'are also shown in the form of corner welds.

Im Rahmen der Erfindung kann die Beschichtung 3 auch mit einem in der Fig. 5 angedeuteten Beschichtungsmuster 14 auf die zu beschichtenden Flächen aufgebracht werden.Within the scope of the invention, the coating 3 can also be coated with an Fig. 5 indicated coating pattern 14 are applied to the surfaces to be coated.

Hinsichtlich der in Fig. 5 dargestellten Struktur der Verbindungsnähte 9, 9' ist festzustellen, dass diese Struktur durch den Auftrag der Beschichtung genau vorgegeben werden kann, insbesondere wenn an der gesamten Fläche der Beschichtung 3 eine Verbindungsnaht 9, 9' oder mehrere Verbindungsnähe 9, 9' gebildet werden.Regarding the in Fig. 5 The structure of the connecting seams 9, 9 'shown shows that this structure can be precisely specified by the application of the coating, in particular if a connecting seam 9, 9' or several connecting seams 9, 9 'are formed on the entire surface of the coating 3.

Es ist aber auch möglich, dass die Verbindungsnähte 9, 9' nur an einem Teil der Beschichtung 3 erzeugt werden. Es ergibt sich dann der Vorteil, dass bei dem Aufbringen der Beschichtung etwas größere Bereiche beschichtet werden können, ohne dass dabei auf eine besondere Genauigkeit geachtet werden muss. Hinsichtlich der Form der Verbindungsnähte 9, 9' ergeben sich im Rahmen einer solchen Verfahrensführung auch in der Regel mehrere Variationsmöglichkeiten.However, it is also possible for the connecting seams 9, 9 ′ to be produced only on part of the coating 3. The advantage then arises that somewhat larger areas are coated when the coating is applied can without having to pay particular attention to accuracy. With regard to the shape of the connecting seams 9, 9 ', there are usually several possible variations in the course of such a procedure.

Um bei einer Ausführungsform gemäß der Fig. 5 die erste Seitenfalte 6a leichter greifen zu können, kann diese gemäß der Fig. 6 auch so ausgeführt sein, dass diese sich über die Frontfläche 5a und die Rückfläche 5b oder zumindest den an die erste Seitenfalte 6a angrenzenden Bereich der Frontfläche 5a und der Rückfläche 5b hinaus erstreckt.In an embodiment according to the Fig. 5 To be able to grip the first side fold 6a more easily, this can be done according to the Fig. 6 also be designed such that it extends beyond the front surface 5a and the rear surface 5b or at least the area of the front surface 5a and the rear surface 5b adjoining the first side fold 6a.

Zusätzlich oder alternativ kann in der Frontfläche 5a und der Rückfläche 5b auch eine Einkerbung 15 benachbart zu der ersten Seitenfalte 6a vorgesehen sein, um die Seitenfalte 6a leichter greifen zu können.Additionally or alternatively, a notch 15 can also be provided in the front surface 5a and the rear surface 5b adjacent to the first side fold 6a in order to be able to grip the side fold 6a more easily.

Claims (6)

  1. A method for producing a woven plastic bag,
    wherein a flat-lying material web (1) is fed along a production direction (P), which material web comprises a woven fabric (2) of plastic strips on a first side,
    wherein the material web (1) comprises opposite edge regions extending perpendicular to the production direction (P) along a transverse direction (Q) and each extending over 10 % of the width of the material web, and a middle section in between,
    wherein the material web (1) is provided with a pattern that repeats along the production direction (P) on the first side of the material web (1) only in regions having a coating in the form of a film or in the form of a liquid plastic,
    wherein the material web (1) is formed into a material tube and
    wherein in order to form individual woven plastic bags, pieces are cut from the material tube, filled and closed,
    characterized in that on the middle section the application of the coating (3) changes in the transverse direction (Q), wherein
    the coating (3) is applied in the form of strips (7, 7") running in the transverse direction (Q), wherein the strips (7, 7") only extend over 40 to 60 % of the width.
  2. The method according to claim 1, characterized in that the coating (3) has a first section and a second section adjacent thereto along the transverse direction (Q), wherein the first section has a first length I1 in the production direction (P) and the second section has a greater second length I2.
  3. The method according to claim 1 or 2, characterized in that the coating (3) runs obliquely at least in sections with respect to the production direction (P) and the transverse direction (Q).
  4. The method according to one of claims 1 to 3, characterized in that after forming the material tube, an internal connection within the material tube between superimposed layers of the material web (1) is formed by fusing the coating (3).
  5. The method according to one of claims 1 to 4, characterized in that the material tube is formed as a side-gusset tube.
  6. The method according to one of claims 1 to 5, characterized in that the coating (3) applied in the regions to be coated is applied in a liquid state with a coating pattern.
EP14200207.0A 2014-12-23 2014-12-23 Method for producing a plastic tissue bag and plastic tissue bag Active EP3037254B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP14200207.0A EP3037254B1 (en) 2014-12-23 2014-12-23 Method for producing a plastic tissue bag and plastic tissue bag
MX2015017352A MX2015017352A (en) 2014-12-23 2015-12-15 Woven plastic bag and method of making same.
CA2915706A CA2915706C (en) 2014-12-23 2015-12-18 Woven plastic bag
US14/975,934 US9809354B2 (en) 2014-12-23 2015-12-21 Method of making a woven plastic bag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14200207.0A EP3037254B1 (en) 2014-12-23 2014-12-23 Method for producing a plastic tissue bag and plastic tissue bag

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EP3037254A1 EP3037254A1 (en) 2016-06-29
EP3037254B1 true EP3037254B1 (en) 2020-04-15

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EP (1) EP3037254B1 (en)
CA (1) CA2915706C (en)
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US11459157B2 (en) 2012-02-13 2022-10-04 Polytex Fibers Llc Woven plastic bags with features that reduce leakage, breakage and infestations
EP3434617B1 (en) 2013-01-22 2021-03-24 Polytex Fibers Corporation Easy access woven plastic bag
US9926107B2 (en) * 2013-09-04 2018-03-27 Mondi Halle Gmbh Side-gusset bag made of a plastic film/fabric laminate
US11305927B2 (en) 2014-04-04 2022-04-19 Polytex Fibers Llc Easy open plastic bags
US11472622B2 (en) 2014-04-04 2022-10-18 Polytex Fibers Llc Woven plastic bags with features that reduce leakage, breakage, and infestations
MX2016013051A (en) 2014-04-04 2017-02-15 Polytex Fibers Corp Woven plastic bags with features the reduce leakage, breakage and infestations.
EP3486080B1 (en) * 2016-07-14 2021-12-08 Totani Corporation Bag making machine for manufacturing plastic bag
PL3290206T3 (en) * 2016-08-30 2021-01-25 Mondi Ag Method for producing a plastic tissue film composite product, plastic tissue film composite and packaging bag made of a plastic tissue film composite
CA3099400A1 (en) * 2018-05-08 2019-11-14 The Glad Products Company Thermoplastic bags with liquid directing structures
WO2020243229A1 (en) * 2019-05-31 2020-12-03 Dow Global Technologies Llc Flexible container with handles
WO2021094266A1 (en) * 2019-11-11 2021-05-20 Lemo Maschinenbau Gmbh Improved wicket bag
CN113263773B (en) * 2021-05-24 2022-03-11 嘉兴星越包装材料有限公司 Packaging material for hot compress, wormwood bag and processing device thereof

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CA2915706A1 (en) 2016-06-23
US20160176579A1 (en) 2016-06-23
MX2015017352A (en) 2016-07-18
EP3037254A1 (en) 2016-06-29
US9809354B2 (en) 2017-11-07
CA2915706C (en) 2018-08-07

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