EP2868594A1 - Sachet composite en tissu en matière plastique - Google Patents

Sachet composite en tissu en matière plastique Download PDF

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Publication number
EP2868594A1
EP2868594A1 EP20130190937 EP13190937A EP2868594A1 EP 2868594 A1 EP2868594 A1 EP 2868594A1 EP 20130190937 EP20130190937 EP 20130190937 EP 13190937 A EP13190937 A EP 13190937A EP 2868594 A1 EP2868594 A1 EP 2868594A1
Authority
EP
European Patent Office
Prior art keywords
composite
bag
plastic
plastic fabric
edges
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.)
Withdrawn
Application number
EP20130190937
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German (de)
English (en)
Inventor
Jens Kösters
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 Halle GmbH
Original Assignee
Mondi Halle GmbH
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 Halle GmbH filed Critical Mondi Halle GmbH
Priority to EP20130190937 priority Critical patent/EP2868594A1/fr
Publication of EP2868594A1 publication Critical patent/EP2868594A1/fr
Withdrawn legal-status Critical Current

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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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/01—Ventilation or drainage of 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
    • 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
    • B65D2205/00—Venting means

Definitions

  • the invention relates to a plastic fabric composite bag having a bag body formed from a composite portion, wherein the composite portion comprises a layer of a plastic fabric and a film layer connected to the plastic fabric, wherein edges of the composite portion are superimposed in an overlapping region to form a longitudinal seam and interconnected.
  • the invention further relates to a method for producing such a plastic fabric composite bag.
  • the filled plastic fabric composite bag is intended as a packaging bag in particular for pourable products such as pelleted pet food, bedding for animals or similar materials, wherein the plastic fabric composite bag both have a pillow shape or can be made as a side gusseted bag.
  • the plastic fabric composite bag is particularly suitable for large containers, which have a considerable filling volume and a considerable filling weight.
  • Plastic fabric composite bags are usually made so that the plastic fabric on the inside of the bag and the associated film layer is on the outside of the bag. A tight seal is not readily possible due to the fabric structure, which is why the composite portion is circumferentially closed at the longitudinal seam by an adhesive.
  • Adhesives include various adhesives, including hot melt adhesives.
  • a gusseted tube is first formed from a plastic composite web, wherein the edges of the plastic composite sheet overlap in a region between the gussets and are connected there after formation of the gusseted tube by an adhesive.
  • adhesives conventional adhesives such as solvent-based adhesives or hot melt adhesives can be used.
  • an adhesive in the context of the invention but also an order of a molten polymer is suitable, which causes a force application in the overlap region a compound.
  • plastic fabric composite bags are not completely hermetically sealed at least on both sides. After filling, air contained in the plastic fabric composite bag can still escape, for example in order to be able to palletise several bags one above the other as a stack.
  • a bag closure which is airtight, this venting function can not be guaranteed.
  • the plastic fabric composite bag can be folded over on both sides and welded by hot air.
  • Such a closure can be provided in particular for practical reasons, in which case the airtight seal usually represents a disadvantage rather, because the previously described venting function is no longer guaranteed.
  • the introduction of openings in the form of a perforation or in the form of slits in the bag body is not useful in many applications, because then there is no more reliable protection against the ingress of foreign bodies, especially insects, mites or the like.
  • the present invention seeks to provide an improved embodiment of a plastic fabric composite bag, wherein regardless of the type of closure on a bag bottom and a bag head reliable ventilation after filling is possible, while ensuring adequate protection of the contents against contamination, mites and insects. Furthermore, a method for producing such a plastic fabric composite bag is to be specified.
  • the invention and the solution of the problem are a plastic fabric composite bag according to claim 1 and a method for its preparation according to claim 11.
  • the invention provides that over a portion of the longitudinal seam, a separate material portion between the overlapping edges of the composite section is inserted and that between one of the edges and the material portion or within the material portion, a vent channel is formed, the one Inner side of the bag connects with a bag outside and has along its course at least one bend and / or a bow.
  • the material portion extends only over a part of the longitudinal seam, wherein the edges of the composite portion are connected to each other in a conventional manner by adhesive, in particular hot-melt adhesive, or even a molten polymer. While one of the edges is glued over its entire length with this longitudinal seam, the material portion between the composite portion and the longitudinal seam is disposed on the other edge. At this edge, the longitudinal seam thus adjoins the composite section at the material section and outside the material section. It is thus possible to form a ventilation channel with the aid of the material section.
  • the material section on its side opposite the longitudinal seam is not completely connected to the associated edge of the composite section, wherein the area recessed by the connection forms the ventilation channel.
  • the material portion can be sealed, for example, on the corresponding edge of the composite portion, wherein the vent channel is formed by a non-all-over seal.
  • two L-shaped interlocking sealing jaws may be provided, between which the venting channel extends with two angled portions, wherein preferably a central portion of the venting channel is parallel to the longitudinal seam and ends of the venting channel open in a transverse direction on the inside of the bag or the bag outside.
  • bonding may also take place, so that then the material section is adhesively bonded to the associated edge of the composite section, wherein the ventilation channel is formed by a non-full-surface application of the adhesive.
  • the previously described labyrinth shape can be provided with two bends, but in principle, other structures of the venting channel come into consideration.
  • the venting duct has at least one bend and / or arc in order to prevent entry by contaminants, insects, mites or the like, on the other hand providing a sufficiently large venting cross-section for venting the plastic fabric composite bag after filling.
  • venting channel is formed within the material portion itself, which is then multi-layered and wherein the layers the material portion are not completely interconnected in the described manner.
  • the material portion is preferably initially placed on the edge in the production, which is arranged in the overlap region on the inside of the bag, because then subsequently the outside edge can be easily placed and glued from the outside.
  • the material portion extends only over a portion of the length of the longitudinal seam, for example, less than 20%, preferably less than 10% of the length of the longitudinal seam.
  • the material portion is wider, more preferably only slightly wider than the overlap region. This can ensure that when gluing the edges along the longitudinal seam not accidentally, the opening of the venting channel is also glued.
  • the material portion may be located flush with the edge of the composite portion disposed in the overlap region on the bag inner side, the material portion on the bag outside projecting beyond the edge of the composite portion disposed in the overlap region on the bag exterior. At least the supernatant of the material section is then still visible on the outside of the bag.
  • each plastic fabric composite bag can be provided with exactly one vent channel.
  • two or more ventilation channels can be formed by a respective material section along the longitudinal seam at a distance from one another.
  • the bag body is hermetically sealed to a bag head and a bag bottom.
  • the Bag body folded there and welded, including in particular hot air can be used.
  • the material portion and the composite portion may be formed of the same material, namely a composite of plastic fabric and a film.
  • the plastic fabric composite bag can either have a simple pillow shape with front wall and rear wall or be produced as a side gusseted bag with two front walls and gussets inserted therebetween.
  • the plastic fabric is expediently formed from strips or ribbons of a stretched film, with a first group of ribbons and a second group of ribbons producing at right angles or approximately at right angles. It is known to produce appropriate plastic fabric on circular looms.
  • the width of the crossing ribbon is usually between 2 mm and 4 mm, in particular between 2.5 mm and 3.2 mm.
  • the stretched in their longitudinal direction plastic tapes are usually made of polyolefin, in particular polypropylene.
  • plastic fabrics having a basis weight of between 50 g / m 2 and 100 g / m 2 , for example having a weight per unit area of about 70 g / m 2, are suitable.
  • the plastic fabric is not readily heat sealable due to its fabric structure.
  • the plastic fabric can optionally also partially or completely with a heat-sealable coating or with glued-on heat-sealable foil sheets.
  • the plastic fabric composite bag according to the invention is particularly suitable for a large filling volume and high weight.
  • individual heat-sealable foil labels can also be placed on the inside, to which then a carrying handle can be attached.
  • the plastic fabric composite bag is formed entirely of polyolefin and particularly preferably entirely of polypropylene (PP).
  • PP polypropylene
  • the film layer or film arranged on the outside of the plastic fabric composite bag can be formed, for example, from polypropylene, in particular a biaxially oriented polypropylene (BO-PP).
  • the layer thickness of such a film is preferably between 10 and 40 microns, more preferably between 15 and 25 microns.
  • a molten film is introduced between the outer film layer and the plastic fabric, which film must have a sufficient thickness to despite the in one certain dimensions irregular structure of the plastic fabric to create a secure connection.
  • the film intended for connection is preferably introduced with a basis weight of between 25 g / m 2 and 50 g / m 2 .
  • the molten film can be extruded in one layer or coextruded in multiple layers.
  • a thin adhesion promoter layer is expediently provided in the direction of the film layer lying on the outside of the plastic fabric composite bag.
  • the outer film layer for example a film made of BO-PP
  • a transparent film is provided.
  • a film that has a certain haze is also understood a film that has a certain haze.
  • the decisive factor is that the imprint remains visible through the film.
  • a terpolymer may be provided as a thin adhesion promoter layer having a thickness between typically 5 and 10 ⁇ m, which is adjacent to the imprint.
  • a layer of PP-PE copolymer may be provided, which has a greater thickness due to the structure of the plastic fabric, which may for example be between 30 and 40 microns.
  • the outer film layer and the plastic fabric can be provided with a primer prior to lamination in order to increase the bond strength.
  • a primer prior to lamination
  • the application of primer on the film layer is useful if this is printed. In that case, sufficient adhesion of the molten film to the print must be achieved.
  • the invention also provides a method for producing the above-described plastic fabric composite bag, wherein a plastic composite web is supplied with a layer of a plastic fabric and a film layer connected to the plastic fabric, wherein material portions are applied to a first edge of the plastic composite web at uniform intervals, wherein the material sections each not so completely connected to the plastic web, that between the material portion and the plastic composite web a venting channel is formed with at least one arc and / or an angling, wherein the plastic composite web is folded to an overlap region between the first edge and a second edge of the plastic composite web to form, wherein the edges are glued together in the overlapping area with the involvement of the material sections and wherein individual sections separated from the plastic composite web become.
  • connection can be made for example by two sealing jaws or a sealing tool such that the venting channel is released.
  • a full-area sealing tool when a coating in the form of the venting channel is applied to the material portion or at the corresponding point of the composite web, which prevents a connection by heat sealing.
  • an adhesive in particular a hot melt adhesive, can be applied in such a way that the venting channel is recessed.
  • the sections separated from the plastic composite web after the formation of a tube can be closed at a first open side to form a bag head and a bag bottom, subsequently filled and finally closed at the second open side.
  • first bag blanks are made, which are closed only on one side and then stored and transported. The filling can then take place in another production site, with only a closure of the bag is still necessary.
  • the bag body can be filled at the bag head or the bottom of the bag.
  • the plastic fabric composite bag can be formed in the context of the invention as a gusseted bag with opposite front walls and gussets arranged therebetween.
  • the gussets can be created either before or after the production of the longitudinal seam with a suitable folding device.
  • the Fig. 1 shows a plastic fabric composite bag with a formed from a composite section 1 bag body 2 in the form of a side gusseted bag with opposite front walls and inserted therebetween gussets. It can be seen that the edges 3a, 3b of the composite section 1 overlap in an overlap region 4 and are connected there by a longitudinal seam 5.
  • a separate material section 6 is arranged on the longitudinal seam 5.
  • the material portion 6 is provided to allow venting of the bag body 2. The details of this result from the Fig. 2 and 3 ,
  • Fig. 3 a section along the line AA the Fig. 1 in that the longitudinal seam 5 connects the edge 3a lying on a bag outer side to the material section 6, wherein the material section 6 in turn is arranged by a non-full-surface connection on the edge 3b, which faces a bag inner side.
  • the Fig. 2 shows in a plan view only the composite portion starting from the bag inside arranged edge 3b with the material portion 6 arranged thereon, wherein the areas of material portion 6 and composite portion 1 connected by an adhesive 7 are highlighted. Accordingly, a ventilation channel 8 is formed by a not full-surface application of the adhesive 7, which has two bends along its course. Through this vent channel 8, excess air can escape from the bag after filling, but can be kept away by the labyrinth shape with two bends dirt, mites or insects. Instead of a connection by adhesive 7, the material portion 6 with the composite portion 1 also not be sealed over the entire surface to the in the Fig. 2 formed venting channel 8 to form.
  • the Fig. 3 shows the layer structure of the composite section 1 in detail.
  • the composite section 1 has a layer of a plastic fabric 9 and a film layer 10 connected to the plastic fabric 9, which also forms the outside of the bag.
  • the film layer 10 and the plastic fabric 9 are interconnected by a coextrusion film 11, wherein a first thin layer 12 of the coextrusion 11 in the direction of the film layer 10 and a second thicker layer 13 of the coextrusion film 11 in the direction of the plastic fabric 9 is arranged.
  • the foil layer 10 made of BO-PP is provided with an imprint 14 on the inside, wherein the first layer 12 of the coextrusion film 11 is formed from a bonding agent which has good adhesion to the imprint 14.
  • the plastic fabric 9 consists of a ribbon fabric of individual stretched and cross-woven plastic film strips.
  • the second layer 13 of the coextrusion film 11 consists of a PP-PE copolymer.
  • the composite portion 1 and the separate material portion 6 may be formed of the same material, but in the material portion 6 usually no imprint 14 is disposed inside.
  • the material portion 6 is aligned flush with the edge 3b disposed inside, wherein the material portion 6 is wider than the overlap region 4 and so protrudes beyond the outer edge 3a.
  • the longitudinal seam which is preferably formed by a PP hotmelt adhesive, does not close the end of the ventilation channel 8 which opens to the outside of the bag.
  • the Fig. 4 shows the production of a plastic composite web 15, from which the composite section 1 is separated.
  • a printed film which forms the film layer 10 and a web of the plastic fabric 9 is supplied and extrusion-laminated by a coextrusion film 11, wherein the imprint 14 of the film protected at the inner layer transition to the coextrusion film 11 is arranged.
  • the plastic composite web 15 thus formed is first turned over at one of its edges 3a, 3b, wherein material sections 6 are then applied at this edge 3b at uniform intervals.
  • the material sections 6 are preferably not completely bonded to the plastic composite web 15 by adhesive 7 or by heat sealing in such a way that a ventilation channel 8 with at least one bend and / or one bend is formed between the material sections 6 and the plastic composite web 15.
  • the other edge 3a of the plastic composite web 15 is folded over in order to form an overlap region 4 can.
  • edges 3a, 3b at the overlap region 4 together connect a hot-melt adhesive is applied to the production of a longitudinal seam 5 on the inside arranged edge 3b, in which case the edges 3a, 3b are compressed and connected to the longitudinal seam 5. Subsequently, individual sections 16 are then separated from the plastic composite web 15, wherein at these sections 16, an open end is folded and closed.
  • the sections 16 are then filled as bag blanks at the still open end, before this is turned over and sealed airtight. Even with an airtight closure of the plastic fabric composite bag thus formed on the bag head and the bottom of the bag reliable ventilation through the vent channel 8 is ensured.
  • Fig. 5 and 6 show in contrast to the Fig. 1 the production of a simple pillow-shaped plastic fabric composite bag with a front wall and a rear wall.
  • gussets can also be produced by folding devices in the formation of the film tube.
  • the side folds are produced before the production of the longitudinal seam 5 by suitable folding devices, in which case the longitudinal seam 5 is formed in an area between the side folds.
  • the Fig. 7 shows a different process control, in the first according to the Fig. 5 a closed tube with the longitudinal sealing seam 5 is formed, before then the gussets are generated.
EP20130190937 2013-10-30 2013-10-30 Sachet composite en tissu en matière plastique Withdrawn EP2868594A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20130190937 EP2868594A1 (fr) 2013-10-30 2013-10-30 Sachet composite en tissu en matière plastique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20130190937 EP2868594A1 (fr) 2013-10-30 2013-10-30 Sachet composite en tissu en matière plastique

Publications (1)

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EP2868594A1 true EP2868594A1 (fr) 2015-05-06

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EP20130190937 Withdrawn EP2868594A1 (fr) 2013-10-30 2013-10-30 Sachet composite en tissu en matière plastique

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4151549A1 (fr) * 2021-09-16 2023-03-22 W. L. Gore & Associates GmbH Évent et récipient comprenant un évent

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2361344A (en) * 1941-10-10 1944-10-24 Pneumatic Scale Corp Vented package
GB2303116A (en) * 1995-05-31 1997-02-12 Kaken Kogyo Co Ltd Check valve for a pouch with releasing film
EP0947438A1 (fr) * 1998-04-03 1999-10-06 Bischof und Klein GmbH & Co. Moyen d'emballage sous forme de sac ou de sachet en film plastique ou en un matériau similaire étanche à l'air
US6174576B1 (en) * 1998-02-12 2001-01-16 Van De Ponseele Joseph Permeable element, bag and cover means
DE10106289A1 (de) 2001-02-06 2002-08-29 Windmoeller & Hoelscher Verfahren zum Herstellen von Seitenfaltensäcken aus Kunststoffolie
EP2149504A1 (fr) * 2008-07-30 2010-02-03 Nordfolien GmbH Emballage en feuille plastique
EP1899235B1 (fr) 2005-05-25 2011-04-27 Windmöller & Hölscher KG Sac a soufflets lateraux comportant une base enroulee

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2361344A (en) * 1941-10-10 1944-10-24 Pneumatic Scale Corp Vented package
GB2303116A (en) * 1995-05-31 1997-02-12 Kaken Kogyo Co Ltd Check valve for a pouch with releasing film
US6174576B1 (en) * 1998-02-12 2001-01-16 Van De Ponseele Joseph Permeable element, bag and cover means
EP0947438A1 (fr) * 1998-04-03 1999-10-06 Bischof und Klein GmbH & Co. Moyen d'emballage sous forme de sac ou de sachet en film plastique ou en un matériau similaire étanche à l'air
DE10106289A1 (de) 2001-02-06 2002-08-29 Windmoeller & Hoelscher Verfahren zum Herstellen von Seitenfaltensäcken aus Kunststoffolie
EP1899235B1 (fr) 2005-05-25 2011-04-27 Windmöller & Hölscher KG Sac a soufflets lateraux comportant une base enroulee
EP2149504A1 (fr) * 2008-07-30 2010-02-03 Nordfolien GmbH Emballage en feuille plastique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4151549A1 (fr) * 2021-09-16 2023-03-22 W. L. Gore & Associates GmbH Évent et récipient comprenant un évent
WO2023041751A1 (fr) * 2021-09-16 2023-03-23 W. L. Gore & Associates Gmbh Ouverture et récipient comprenant une ouverture

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