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EP2752371A1 - Sac doté d'un dispositif de purge d'air - Google Patents

Sac doté d'un dispositif de purge d'air Download PDF

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Publication number
EP2752371A1
EP2752371A1 EP13006005.6A EP13006005A EP2752371A1 EP 2752371 A1 EP2752371 A1 EP 2752371A1 EP 13006005 A EP13006005 A EP 13006005A EP 2752371 A1 EP2752371 A1 EP 2752371A1
Authority
EP
European Patent Office
Prior art keywords
plastic
wall
layers
bag
perforations
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.)
Granted
Application number
EP13006005.6A
Other languages
German (de)
English (en)
Other versions
EP2752371B1 (fr
Inventor
Thomas Karich
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
Publication of EP2752371A1 publication Critical patent/EP2752371A1/fr
Application granted granted Critical
Publication of EP2752371B1 publication Critical patent/EP2752371B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
    • 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
    • B65D31/14—Valve bags, i.e. with valves for filling
    • B65D31/147—Valve bags, i.e. with valves for filling the filling port being provided in a side wall

Definitions

  • the invention relates to a bag with a jacket wall which is closed from a flat material to a tubular shape by means of at least one longitudinal seam and having a plastic wall and at least one paper wall, and having at least one bottom which is folded at one end of the jacket wall, wherein the plastic wall at least partially double-layered and the two layers each have mutually offset ventilation perforations.
  • bags are known in numerous embodiments. You can have such a stable jacket wall that they can be filled with a product with high weight.
  • bags are common, which are filled with a pourable filling material with a mass of, for example, 5 to 50 kg to transport the contents of the manufacturer to the user.
  • the jacket wall of such bags is formed with stable papers, especially with kraft paper. It is readily possible to form bags with a filling weight of the type mentioned with a single-layer or multi-layer jacket wall made of kraft paper in sufficient stability. However, if the contents are sensitive to moisture, it makes sense to form the jacket wall with at least one closed plastic wall, which is an effective barrier against moisture penetration. In such bags, however, arises - especially if they are designed as valve sacks and are filled via a filler neck of a filling machine - that with the Filling material inside the bag is trapped air, which leads to a bloated bag shape and prevents compacting of the contents inside the bag. Numerous attempts have therefore been made to allow venting of such a bag during filling and after filling.
  • EP 1 813 545 B1 It is also known to form a bag with multiple layers of paper and provide a plastic liner.
  • the plastic intermediate layer is not hermetically sealed, since the formation of the tubular jacket wall is effected by a longitudinal adhesive seam of the outer paper layer. This longitudinal adhesive seam is formed but interrupted, so that an air outlet is guaranteed for venting of the bag.
  • a disadvantage of this solution in turn, that the conclusion against exposure to moisture is not complete, so that in particular a long-term exposure to moisture can have adverse effects on the contents.
  • a bag of the type mentioned is through US 2005/0281494 A1 known.
  • An inner layer of plastic material has vents, which are covered by a plastic strip.
  • the plastic strip is also provided with ventilation openings, which are arranged offset to the ventilation openings of the inner layer.
  • the plastic strip is fastened to the inner layer so that a sealed channel is formed, through which air exiting through the ventilation openings of the inner layer can flow to the ventilation openings of the plastic strip and thus can escape from the bag.
  • the inner plastic layer may be covered with an outer paper layer of the bag.
  • the plastic strip is on the plastic inner layer of the bag so applied that it forms the channel. Accordingly, there is a communication path between the outer space of the bag and the interior through which moisture can enter the interior and damage the contents.
  • the present invention is therefore based on the problem to bring about a safe moisture removal in a bag of the type mentioned above while allowing venting during and after filling.
  • the present invention is based on the fact that two plastic layers abut each other so that they are closed due to the staggered vent perforation at atmospheric pressure, so that at rest, an air or gas exchange between bag interior and bag exterior is not possible because the plastic layer hermetically encloses the interior. Due to an overpressure, in particular in the interior of the bag, the two plastic layers can separate from each other so that air can escape from the bag via the path of the venting perforations of the lower layer, the space between the two plastic layers and finally the venting perforation of the upper layer.
  • a possibly inflated when filling sack can thus be vented by pressing against the bag wall, which leads to an overpressure in the bag interior, so that a compacting of the contents during filling, but also a subsequent compacting of the contents is possible.
  • the air volume released from the product can be transferred via the two adjacent plastic layers are removed by the plastic layers are brought by the pressure to lift each other.
  • Adjacent plastic layers regularly lead to an airtight seal. This effect can be further enhanced by selecting as the material of the plastic layers those materials which bring about a certain surface adhesion. Examples of these are films of low-density polyethylene, of polyvinyl alcohol or the like. Other plastic film materials allow the desired adhesion forces at least after a conventional surface treatment.
  • the perforations extend in strips over a length of the bag running perpendicular to the bottom. In this way, venting is possible over the entire length of the bag.
  • the perforations of the two layers in the width direction are arranged side by side, in particular when the perforations strip-shaped in the longitudinal direction - that is perpendicular to the width direction - extend.
  • the perforation holes are preferably small and numerous and, for example, have a diameter between 0.2 and 5 mm, preferably between 0.5 and 2 mm, as circular perforation holes.
  • a diameter between 0.2 and 5 mm, preferably between 0.5 and 2 mm, as circular perforation holes.
  • other forms of perforation holes are possible, such as rectangular or polygonal holes, oval holes o. The like. Of importance is not the shape of the holes, but whose free flow cross-section
  • the plastic wall has an applied plastic strip as a second layer.
  • the plastic wall is self-contained and hermetically sealed, but provided with introduced in a suitable form perforation holes. These perforation holes are closed by the applied plastic strip, but in turn has perforation holes, which are not aligned with the perforation holes of the plastic wall, but arranged offset.
  • the second layer may be glued or welded onto the plastic wall at the edges of the plastic strip. Since the plastic layers abutting offer an airtight seal, but it is sufficient to keep them otherwise pressed against each other at the edges of the plastic strip, for example by a seam, by riveting o. ⁇ .
  • the two plastic layers can stand out from each other due to their connection by an overpressure to make a vent path free. This is achieved, for example, by the fact that when the two plastic layers are joined to one another, a stretching bias of at least one of the plastic layers is avoided so that they can be lifted from the other plastic layer due to their flexibility or elasticity.
  • the formation of the second layer as a separate part can be avoided in that the two layers are formed overlapping ends of the plastic wall, which are fixed to each other on both sides of the perforations.
  • the plastic wall With a given size, it is therefore possible to produce the plastic wall with a corresponding peripheral oversize and to provide in a suitable form with the perforation holes, so that they come to lie next to each other, for example, and in any case are not aligned.
  • the plastic wall is not an outer wall of the bag, but is covered by a paper wall to the outside.
  • the plastic wall can then be an inner wall or an intermediate wall of the jacket wall.
  • the possibly more sensitive to external influences plastic assembly for venting is covered by a protective paper layer, wherein the paper layer may preferably have a vent slot. Since the paper layer is permeable to gas, the vent slot can be dispensed with if no rapid venting is required.
  • FIG. 1 schematically shows a plastic wall 1, which has a perforation 2 extending over a longitudinal direction L of a bag.
  • the perforation consists in the illustrated embodiment of three juxtaposed perforation holes, which are arranged one behind the other in the longitudinal direction L.
  • a plastic strip 7 is applied on the plastic wall 1, in which it is hermetically sealed at its longitudinal edges with adhesive or welds 4 with the plastic wall 1.
  • the plastic strip 7 has a second perforation 3, which is formed in the same way as the perforation 2 of the plastic wall 1, but laterally offset.
  • the perforation of the plastic wall 1 takes in a width direction B one half of the width of the plastic strip 7, while the perforation 3 of the plastic strip 7 is disposed on the other half of the plastic strip 7.
  • FIG. 2 schematically illustrates a cross section through a jacket wall of a bag, which consists of the plastic wall closed to a hose 1 and a surrounding outside, closed to a hose paper 8.
  • the paper wall 8 is gas-permeable due to the material, while the plastic wall 1 is gas-permeable.
  • FIG. 2 illustrates that the tubular plastic wall 1 is formed of a flat film which is closed by a longitudinal welding or adhesive seam 6 to the hose.
  • the outer paper wall 8 is also made of a flat material and closed by a longitudinal adhesive seam 5 to form a tube.
  • the sealing of the bag takes place in the area of the at least one floor.
  • bottoms are formed by folding, for example, a crossbase, a block or block bottom, folded bottoms (ends) of flat bags, etc.
  • the bag has a bottom at both ends and can be filled via a valve opening, so is a valve bag.
  • the plastic strip 7 is applied to the tubular plastic wall 1 inside.
  • the function results in the same way, however, even if the plastic strip 7 outside, that is attached between the plastic wall 1 and paper 8 on the plastic wall 1.
  • FIG. 3 illustrates in a perspective view of the structure of a bag formed from a tubular material.
  • the plastic wall 1 is hermetically sealed by means of the adhesive or weld seam 6, ie impermeable to gas and moisture. It is provided on the opposite side of the seam 6 with the perforation 2, which extends on one half of the width of the plastic strip 7 in the longitudinal direction L and is covered by a non-perforated part of the plastic strip 7 to the interior of the jacket wall.
  • the plastic strip 7 has on its other half the perforation. 3 on, which is covered radially outwardly by a non-perforated portion of the plastic wall 1.
  • the jacket wall is completed by an outer paper 8, so that the plastic wall 1 is an inner wall or an intermediate wall.
  • An intermediate wall is present when a further paper layer is formed tubular on the inside of the plastic wall 1.
  • the arrangement of the perforations 2 and 3 shown as an example is not mandatory for the venting function according to the invention. It is only important that the holes of the perforations 2 and 3 are not aligned with each other and are reliably closed by the juxtaposition of the plastic layers 1 and 7 in the idle state. It is readily possible to arrange the perforation holes of the two perforations 2 and 3 in interlaced patterns, so as to realize small ventilation paths.
  • the length of the selected ventilation paths depends on the material, the thickness and the adhesion of the plastic layers 1, 7 and must be selected so that the gas-tight closure is not opened by the two plastic layers 1, 7 even at low pressure effects.
  • the plastic wall 1 can form the vent strip itself by the plastic wall 1 is dimensioned so that beyond the adhesive or weld 6, an overlapping strip is formed and the two perforations 2, 3 are introduced in this area.
  • the strip itself must then also be hermetically connected to the plastic wall 1 at its free end in order to ensure the sealing function.
  • the operation of this embodiment is identical to that of the FIGS. 1 to 3 described mode of action.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
EP20130006005 2013-01-03 2013-12-23 Sac doté d'un dispositif de purge d'air Active EP2752371B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201310000038 DE102013000038A1 (de) 2013-01-03 2013-01-03 Sack mit einer Entlüftungseinrichtung

Publications (2)

Publication Number Publication Date
EP2752371A1 true EP2752371A1 (fr) 2014-07-09
EP2752371B1 EP2752371B1 (fr) 2015-04-15

Family

ID=50928478

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20130006005 Active EP2752371B1 (fr) 2013-01-03 2013-12-23 Sac doté d'un dispositif de purge d'air

Country Status (3)

Country Link
EP (1) EP2752371B1 (fr)
DE (1) DE102013000038A1 (fr)
ES (1) ES2541297T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110914166B (zh) * 2017-05-23 2022-05-17 比朔夫+霍莱恩欧洲股份及合伙两合公司 可排气的阀袋
WO2023075712A1 (fr) * 2021-11-01 2023-05-04 Bangkok Polysack Co., Ltd. Sac à bandes de ventilation pour ventiler et protéger l'accès à l'humidité dans le sac

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202014007340U1 (de) 2014-09-15 2015-12-18 Bischof + Klein Gmbh & Co. Kg Flexibles Verpackungsbehältnis
EP3519311A1 (fr) * 2016-09-27 2019-08-07 Windmöller & Hölscher KG Sac en matière plastique, en particulier sac réalisé selon le procédé simultané formage/remplissage/scellage ainsi que procédé et dispositif de fabrication et de remplissage d'un sac
DE102016220428A1 (de) 2016-09-27 2018-03-29 Windmöller & Hölscher Kg Ventilsack sowie Verfahren und System zur Herstellung eines Ventilsacks
DE202018100246U1 (de) * 2018-01-17 2019-04-30 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh Mehrlagiger Sack

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1486733A1 (de) * 1965-09-25 1969-06-04 Windmoeller & Hoelscher Kunststoff-Ventilsack
US3628720A (en) * 1968-11-18 1971-12-21 Windmoeller & Hoelscher Plastics sacks provided with venting or aerating perforations
EP0867379A1 (fr) 1997-03-23 1998-09-30 Karl-Heinz Möller Sachet pour denrées alimentaires
US20050281494A1 (en) 2003-04-23 2005-12-22 Exopack-Technology, Llc Method of forming a vented bag
EP1813545B1 (fr) 2006-01-26 2009-05-13 Mondi AG Sac multicouche en papier
US20110188786A1 (en) * 2004-05-27 2011-08-04 Heinemeier Juergen Plastic Bag with Overpressure Relief

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4303894C2 (de) * 1993-02-10 1996-05-09 Haver & Boecker Verfahren zum Herstellen eines mit einem Schüttgut füllbaren, im Leerzustand flachen Packmittel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1486733A1 (de) * 1965-09-25 1969-06-04 Windmoeller & Hoelscher Kunststoff-Ventilsack
US3628720A (en) * 1968-11-18 1971-12-21 Windmoeller & Hoelscher Plastics sacks provided with venting or aerating perforations
EP0867379A1 (fr) 1997-03-23 1998-09-30 Karl-Heinz Möller Sachet pour denrées alimentaires
US20050281494A1 (en) 2003-04-23 2005-12-22 Exopack-Technology, Llc Method of forming a vented bag
US20110188786A1 (en) * 2004-05-27 2011-08-04 Heinemeier Juergen Plastic Bag with Overpressure Relief
EP1813545B1 (fr) 2006-01-26 2009-05-13 Mondi AG Sac multicouche en papier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110914166B (zh) * 2017-05-23 2022-05-17 比朔夫+霍莱恩欧洲股份及合伙两合公司 可排气的阀袋
WO2023075712A1 (fr) * 2021-11-01 2023-05-04 Bangkok Polysack Co., Ltd. Sac à bandes de ventilation pour ventiler et protéger l'accès à l'humidité dans le sac

Also Published As

Publication number Publication date
EP2752371B1 (fr) 2015-04-15
ES2541297T3 (es) 2015-07-17
DE102013000038A1 (de) 2014-07-03

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