EP2284090A1 - Sac et son procédé de fabrication - Google Patents

Sac et son procédé de fabrication Download PDF

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Publication number
EP2284090A1
EP2284090A1 EP09010503A EP09010503A EP2284090A1 EP 2284090 A1 EP2284090 A1 EP 2284090A1 EP 09010503 A EP09010503 A EP 09010503A EP 09010503 A EP09010503 A EP 09010503A EP 2284090 A1 EP2284090 A1 EP 2284090A1
Authority
EP
European Patent Office
Prior art keywords
bag
longitudinal edges
reinforcing
material web
reinforcing strip
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
EP09010503A
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German (de)
English (en)
Other versions
EP2284090B1 (fr
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
Nordenia Deutschland 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 Nordenia Deutschland Halle GmbH filed Critical Nordenia Deutschland Halle GmbH
Priority to EP20090010503 priority Critical patent/EP2284090B1/fr
Publication of EP2284090A1 publication Critical patent/EP2284090A1/fr
Application granted granted Critical
Publication of EP2284090B1 publication Critical patent/EP2284090B1/fr
Not-in-force 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/02—Local reinforcements or stiffening inserts, e.g. wires, strings, strips or frames

Definitions

  • the invention relates to a bag made of a flexible material having opposite front walls, between the front walls arranged side walls and the front walls with the side walls connecting longitudinal edges, wherein the longitudinal edges are stiffened by sealing seams and extending in the direction of the longitudinal edges reinforcing strips.
  • the flexible material is in particular a plastic film, preferably a multilayer plastic film.
  • the term also includes composite materials having a sealable layer, e.g. B. Composite materials of film and paper and films with fabric reinforcements.
  • the invention also provides methods for producing such bags.
  • the bags are used as packaging, for example, for particulate, granular or powdery bulk material, which have an approximately rectangular cross-section.
  • the bags are often formed by forming a bottom as a stand-up pouch.
  • This has the consequence that the packaging gives an overall low-quality impression. Due to the lack of dimensional stability also a space-saving storage is difficult and impairs the stability.
  • a bag which, according to the features described above, has sealing seams for reinforcement on the longitudinal edges connecting the front walls with the side walls.
  • the bag is formed by folding and heat sealing of a material web, wherein the longitudinal edges of the material web are sealed on one of the two front walls to each other to close the bag circumferentially.
  • the sealing seams are designed accordingly as blind seals, so do not serve the closure of the bag, but only the stiffening.
  • reinforcing strips in which case the longitudinal edges are generated in the region of the reinforcing strip.
  • the reinforcing strips are made of a foil covering the entire areas, from which the reinforced longitudinal edges are subsequently formed.
  • a material section forming the associated front wall and a material section forming the associated side wall are superimposed and welded to one another via the reinforcing strip provided there.
  • the sealing seam formed in this way welds the reinforcing strip, which is provided for stiffening, onto itself, folded on its side facing the inside of the bag with itself, this sealing seam being directly adjacent to the interior of the bag.
  • the dimensional stability of the bag can be significantly increased.
  • the sealing seams are torn open again at the occurrence of peeling forces on the respective self-folded reinforcing strip.
  • peeling forces may occur, for example, when the inner pressure is compressed when the bag is compressed by stacking or due to short bursts, for example when the bag is dropped rises in the bag. If in the known design of the bag, the seal is separated, there is a risk that the bag completely bursts under load.
  • the additional reinforcing strip represents a material reinforcement
  • there is also a danger with blindseal seams because weak spots can be formed by heat sealing and buckling of the bag forming material as well as the reinforcing strip.
  • a bursting of the bag should be avoided as possible even with extreme force effects, since not only the contents contained in the damaged bag is affected, but also the environment, such as collectively stored bags or other goods can be significantly contaminated.
  • From the US Pat. No. 6,065,873 is a gusseted bag with the features described above known, being applied to the longitudinal edges of reinforcing strips from the outside. In this embodiment, too, there is a risk that the formed sealing seams will be separated by peeling forces.
  • the from the US Pat. No. 6,065,873 known bag is provided as a carrying bag, which should not be sealed airtight and / or moisture-proof. The manufacture of the bag, in which the reinforcing strips must be placed around the longitudinal edges, is expensive.
  • the invention has for its object to provide a bag with the features described above for packaging, which are characterized by an increased mechanical strength, in particular a higher fall resistance.
  • the object is achieved in that at the longitudinal edges in each case a the associated front wall forming material portion and the associated side wall forming material portion are connected to each other directly at the sealing seam, wherein the associated reinforcing strip on the inside of the bag covers a corner formed between the two sections of material.
  • a second embodiment of the invention for solving the problem that at the longitudinal edges of each provided therein reinforcing strip extends unfolded in the region of the sealed seam, wherein at the sealing seam by heat sealing an associated front wall forming material portion on a first side of the reinforcing strip and the associated side wall forming material portion is fixed to the opposite second side of the reinforcing strip.
  • the sealing seam which connects the material sections of the front wall and the side wall, is concealed on the inner side of the bag by the reinforcing strips running in the direction of the longitudinal edges and thus protected against mechanical loads.
  • the reinforcing strip is connected at the side of the sealing seam connecting the material sections to both the associated front wall and the associated side wall. While in the embodiments known from the prior art, the longitudinal edges are strongly stressed in a mechanical force acting on a peeling, these peeling forces are converted according to the first inventive embodiment by the reinforcing strips in shear forces, whereby a significantly higher load capacity is achieved. In addition, there is a uniform, larger-area force distribution, so that overall the stability of the bag and in particular the drop resistance can be greatly increased.
  • the bag has plastic as an essential component, wherein the intended for the formation of the bag flexible material must have heat-sealable properties at least on one side, so that the sealing seams can be produced.
  • the bag is made of a plastic film.
  • a thin metal layer, a metallized plastic layer, a tissue of a paper layer and the like is provided inside or on a non-heat sealing side of the foil.
  • the invention relates in particular to gusseted bags in which the side walls are formed as gussets, each with a fold line extending between the longitudinal edges.
  • gusseted bags there is the advantage that they are initially prefabricated and filled later, both the not yet sealed prefabricated bags and the subsequently filled and sealed, preferably air- and / or moisture-tight sealed bags are included in the present invention .
  • By forming gussets the bags can be easily stacked and transported with folded gussets in the flat state. It is also important in addition that the lightest possible filling should be possible.
  • the stiffening provided according to the invention at the longitudinal edges and the associated increased dimensional stability, it is easier to introduce a filling funnel of a filling device into the prefastened side-folding bag which is open on one side.
  • transverse elements which are sealed on the inside of the bag contribute to a further increase in the dimensional stability and thus additionally facilitate the filling.
  • a stiffening element extending in the transverse direction of the sealing seams in the form of a rigid piece of film is provided on the inside of the bag, which is on one of the side or front walls or preferably extends substantially around the entire circumference.
  • the strip-shaped section can be formed, for example, from polyethylene or a multilayer film, for example a polyethylene terephthalate / polyethylene (PET / PE) composite. It is also possible an embossing of this stiffening element, an embossment of the bag wall and / or an arrangement of additional sealing seams, to further increase the strength. In prefabricated bags that are to be filled later, can be achieved by the additional stiffening element in particular a better and faster bag opening of the initially folded areas of the bag held, which allows very short cycle times at filling systems. It should be noted that the filling itself can be done very quickly depending on the contents partially, the entire process speed is then essentially determined by the handling of the bag, so in particular the opening behavior of the bag.
  • PET / PE polyethylene terephthalate / polyethylene
  • the bag is formed by folding and heat sealing from a material web, in which case the longitudinal edges at least are formed in part as folded edges.
  • the edges of the material web can be connected to one another to form a circumferentially closed tube either on one of the front or side walls or on one of the longitudinal edges.
  • all sealing seams may be formed on the longitudinal edges as blind seal seams, in the second case on three of the four longitudinal edges as blind seal seams.
  • blind seal seam is understood to mean a sealed seam which is not provided for closing the pouch, but essentially only for its stiffening. A complete tightness of the blind seals is therefore not absolutely necessary.
  • the blind seals also need not extend the entire length of the bag. To achieve the effect of the present invention, it is sufficient if the blind seals and the reinforcing strips extending in the longitudinal direction extend over most of the length of the bag.
  • the front and side walls are preferably formed from a multilayer film, wherein the film on the inside of the bag a first heat-sealable film layer and on the outside a second film layer which is not heat-sealable or at least has a higher melting temperature than the first film layer, having.
  • the entire bag can be formed by folding and heat sealing from a single material or foil web.
  • Suitable examples are multilayer laminates which have an inner heat-sealable layer of a polyolefin, in particular polyethylene (PE), and an outer layer of a polyester, in particular polyethylene terephthalate (PET).
  • PE polyethylene
  • PET polyethylene terephthalate
  • optional connecting and functional layers made of plastic or even thin metal layers can be provided in particular to improve the barrier properties.
  • a film laminate or a coextrusion film which consists entirely of polyolefin may also be provided to form the bag.
  • a film laminate or a coextrusion film which consists entirely of polyolefin may also be provided to form the bag.
  • a film laminate or a coextrusion film which consists entirely of polyolefin may also be provided to form the bag.
  • a biaxially oriented polypropylene (BOPP) for example, is suitable for the second film layer arranged on the outside.
  • multi-layered reinforcing strips are preferably used with an externally heat-sealable layer being sealed to the associated front wall and the associated side wall, and wherein the opposite layer is not heat sealable or at least has a higher melting temperature.
  • the reinforcing strips can be fastened to the adjacent material sections in a particularly simple manner when the bag is folded up. However, it must be avoided that the then folded on reinforcing strips stick inside, so are sealed with itself.
  • each provided there reinforcing strip with sealing seams on the associated front wall and the associated side wall is attached, said sealing seams are at a distance from the sealed seam, which directly connects the material section of the front wall with the material section of the side wall at the considered longitudinal edge.
  • the middle bending region of the reinforcing strip is recessed. This avoids that new vulnerabilities are created by the sealing. Mechanical loads are thus also kept to a certain extent by the kink as a weak point and the connection arranged behind the front and side wall.
  • the reinforcing strips provided for reinforcement on the longitudinal edges remain unfolded and are sealed on their two sides with a sealed seam in the longitudinal edge. It is basically sufficient if single-layer film strips are used as reinforcing strips. If polyethylene (PE) is provided as the inner layer on the front and side walls, for example, the reinforcing strips are preferably made of PE. Alternatively, it is also possible to form the reinforcing strip at least in three layers, wherein an intermediate layer is arranged between the heat-sealable outer layers.
  • PE polyethylene
  • a further increase in the load capacity can be achieved, which is determined not only by the invention provided on both sides sealing the reinforcing strip but also by a certain elasticity or toughness of the reinforcing strips.
  • PA polyamide
  • thermoplastic elastomer a further increase in the load capacity can be achieved, which is determined not only by the invention provided on both sides sealing the reinforcing strip but also by a certain elasticity or toughness of the reinforcing strips.
  • the invention also provides methods for producing a bag.
  • a material web is fed, in which case reinforcing strips are placed on the material web at a distance from one another and connected to the material web become.
  • the reinforcing strips remain unconnected at least at half their width, wherein initially a prefixing of the reinforcing strips, for example by a rotary sealing tool, is sufficient.
  • the material web is folded onto itself in the region of the reinforcing strips so as to form longitudinal edges such that the reinforcing strips are also folded onto themselves there. It should also be included that the reinforcing strips are pre-folded prior to placing on the web, so that they can easily be folded over with the formation of the longitudinal edges.
  • the folding of the material web takes place in such a way that the material web extends in the region of the reinforcing strips in the direction of the respective outer edge beyond the associated self-folded reinforcing strip, wherein subsequently the folded bag film directly bears on its inner surface between the outer edge and the respective reinforcing strip itself is heat sealed by a sealing seam and wherein a folded in the outer side first side of the reinforcing strip is additionally sealed with the material web, without the reinforcing strips are sealed in its second, in the folded state inside with itself.
  • the assignment of the outer first side of the reinforcing strips and the second folded side inwardly of the reinforcing strips refers only to the reinforcing strip itself. Based on the film tube formed from the bag film, the entire reinforcing strips are arranged inside.
  • the folded reinforcing strips are preferably sealed with the material web for the bag film in such a way that in each case a bending edge of the reinforcing strips is recessed by a heat seal. As described above, this results in the advantage that with such a process management a particularly high strength of the bag can be achieved at the longitudinal edges.
  • a web is also supplied first, then reinforcing strips are placed at a distance from each other on the web and connected to the web. Again, a prefixing is initially sufficient to hold the reinforcing strips in the subsequent process steps in the predetermined position on the material web. According to the invention, it is then provided that the material web is folded onto itself in the region of the reinforcing strips to form longitudinal edges such that the respective reinforcing strip is not folded there, the bag film extending on both sides of the reinforcing strip and the bag film subsequently passing through on both sides a Siegeinaht is fixed. At three of the four longitudinal edges while the bag film is wrapped around the self-unfolded reinforcing strips. On the other hand, on one of the longitudinal edges it can be provided that the two edges of the material web come together there.
  • transverse seals are usually formed after the folding and production of sealing seams and individual bags which are open at one end are cut off. These bags can then be stored and transported as prefabricated gusseted bags, the bags being filled and sealed subsequently at their open end.
  • the bag according to the invention comprises according to the Fig. 1 opposite front walls 1, arranged between the front walls 1 side walls 2 and the front walls 1 with the side walls 2 connecting longitudinal edges 3, wherein the longitudinal edges 3 are reinforced by sealing seams 4.
  • the bag is formed in the embodiment as a stand-up pouch and has in a conventional manner a bottom 5 and a top seal 6, which closes the bag at its top.
  • the bag shown is designed as a gusseted bag, wherein the side walls 2 each have a longitudinally extending fold line 7 as gussets between the longitudinal edges 3.
  • the bag can be pre-assembled and folded flat. The filling and the closure at the top seal seam 6 are then made later on a corresponding filling device.
  • the bag Due to the reinforcement at the longitudinal edges 3, the bag has an overall increased dimensional stability, whereby also the filling process is facilitated.
  • a strip-shaped stiffening element 8 is provided on the inside of the bag, which extends in the transverse direction. By the stiffening element 8, the dimensional stability of the bag is further increased.
  • the prefabricated, initially flattened bag can be opened easier and faster during handling in a filling device, whereby the entire filling process can be significantly accelerated.
  • reinforcing strips 9, 9 ' are provided in the region of the longitudinal edges 3 for further reinforcement, which extend in the longitudinal direction of the bag and consist of a plastic film.
  • a material section forming the associated front wall 1 and a material section forming the associated side wall 2 are directly connected to each other at the sealed seam 4, wherein the associated reinforcing strip 9 on the inside of the bag forms an area formed between the two material sections Corner covers.
  • the Fig. 3 shows a detailed view of this embodiment in the region of one of the longitudinal edges 3.
  • the illustrated longitudinal edge 3 is formed as two further longitudinal edges 3 as a folding edge, which there preferably over the entire length of the bag extending seal seam 4 is designed as a blind seal, so not the closure of Bag but essentially serves only reinforcement.
  • the entire bag is formed from a single web of material 10, wherein the edges of the material web 10 at the not shown in detail fourth longitudinal edge 3 'merged and according to the illustration of Fig. 3 are sealed together.
  • the material web 10 consists of a preferably multilayer plastic film or a flexible laminate, which has at least one layer of a sealable plastic film.
  • the bag film 10 has a multilayered construction and has on the inside of the bag a first heat-sealable film layer 11 and on the outside a second film layer 12, which is not heat sealable or at least has a higher melting temperature than the first film layer 11 on.
  • the first film layer 11 is preferably a polyolefin having a low melting point, for example PE.
  • PET or BOPP may be provided as the second, outer film layer 12.
  • additional intermediate layers can also be provided without restriction.
  • reinforcing strip 9 is formed as a multilayer plastic film and has an outer heat-sealable layer 13 and an opposite layer 14 which is not heat-sealable or at least has a higher sealing temperature.
  • Fig. 4 shows a variant of the invention in which at the longitudinal edges 3, 3 'there provided each reinforcing strip 9' unfolded in the region of the sealed seam 4, wherein at the sealing seam 4 by heat sealing a the associated front wall 1 forming material portion on a first side 15th and a material portion forming the associated side wall 2 is secured to an opposite second side 16 of the reinforcing strip 9 '.
  • peeling forces can not be avoided, but there is the advantage that the force is distributed to two sealing areas on the first side 15 and on the second side 16 of the reinforcing strip 9 '.
  • the reinforcing strip 9 'on a certain elasticity, so that just short-term shocks can be absorbed.
  • the material web 10 is executed as described above, wherein here three of the four longitudinal edges 3 are formed by folding the material web 10. Like in the Fig. 4 indicated by dashed lines, the web of material 10 at the longitudinal edges 3 then extends completely around the reinforcing strip 9 '. For optical reasons, however, there is provided a trimming, that is the outer, the reinforcing strip 9 'encompassing region of the web 10 was subsequently separated. Finally, by trimming, the thickness of the longitudinal edges 3 can be reduced, whereby the bags can be better stacked in a version as side gusset bag. At the fourth longitudinal edge 3 ', as described above, the edges of the bag film 10 are brought together.
  • both sides 15, 16 of the reinforcing strip 9 ' must be made heat-sealable, this can, as shown in the embodiment, be formed in one layer.
  • this can, as shown in the embodiment, be formed in one layer.
  • the reinforcing strip 9 'at least three layers form, wherein between heat-sealable outer layers at least one intermediate layer is provided.
  • a material web 10 are supplied, in which case reinforcing strips 9, 9 'are placed at a distance from one another on the material web 10 and connected to the material web 10.
  • the longitudinal edges 3, 3 'are then subsequently produced directly in the region of the reinforcing strips 9, 9'.
  • the reinforcing strips are initially prefolded on themselves and then unfolded again to an angle of about 90 °, so as in the Fig. 6 represented, the reinforcing strips 9 can be connected at one side of the buckling with the material web 10, including, for example, a rotary sealing tool can be provided.
  • a rotary sealing tool can be provided in the formation of in Fig. 2 and Fig.
  • the Fig. 7 shows a correspondingly folded on itself material web 10, wherein two opposite front walls 1 are formed with arranged therebetween side walls 2.
  • the side walls 2 are formed as inwardly folded side gussets.
  • a sealing tool 18 is indicated, with which at the longitudinal edges 3, 3 'sealing seams 4, 4' are generated, which are spaced from each other by a recess 19 in the sealing tool 18.
  • the recess 19 is located exactly where the bend region of the reinforcing strip 9 is located.
  • the bag film is placed directly around the reinforcing strips 9 'without being folded by themselves. Then, only a single sealed seam 4 is produced in the region of the longitudinal edges 3, 3 ', which joins the respective reinforcing strip 9' on its two sides to the bag film 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
EP20090010503 2009-08-14 2009-08-14 Sac et son procédé de fabrication Not-in-force EP2284090B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20090010503 EP2284090B1 (fr) 2009-08-14 2009-08-14 Sac et son procédé de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20090010503 EP2284090B1 (fr) 2009-08-14 2009-08-14 Sac et son procédé de fabrication

Publications (2)

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EP2284090A1 true EP2284090A1 (fr) 2011-02-16
EP2284090B1 EP2284090B1 (fr) 2013-02-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016030856A1 (fr) * 2014-08-27 2016-03-03 Nestec S.A. Poche souple à bandes de support à mémoire de forme et ses procédés de fabrication et d'utilisation
EP3792192A1 (fr) * 2019-09-16 2021-03-17 Mondi AG Agencement de sacs d'emballage ainsi que procédé de fabrication et de manipulation de l'agencement de sacs d'emballage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020004962A1 (de) 2020-08-14 2022-02-17 Mondi Ag Verpackungsbeutel auf Papierbasis sowie Verfahren zur Herstellung eines Verpackungsbeutels

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62152937U (fr) * 1986-03-18 1987-09-28
DE4203798A1 (de) * 1992-02-10 1993-08-12 Rovema Gmbh Schlauchbeutel und verfahren und vorrichtung zu seiner herstellung
US6065873A (en) 1999-03-01 2000-05-23 Fowler; Margaret E. Foldable self-standing carry-all
JP2007284099A (ja) * 2006-04-17 2007-11-01 Seisan Nipponsha:Kk 合成樹脂製袋体

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62152937U (fr) * 1986-03-18 1987-09-28
DE4203798A1 (de) * 1992-02-10 1993-08-12 Rovema Gmbh Schlauchbeutel und verfahren und vorrichtung zu seiner herstellung
DE4203798C2 (de) 1992-02-10 1999-07-15 Rovema Gmbh Verfahren und Vorrichtung zur Herstellung eines Schlauchbeutels
US6065873A (en) 1999-03-01 2000-05-23 Fowler; Margaret E. Foldable self-standing carry-all
JP2007284099A (ja) * 2006-04-17 2007-11-01 Seisan Nipponsha:Kk 合成樹脂製袋体

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016030856A1 (fr) * 2014-08-27 2016-03-03 Nestec S.A. Poche souple à bandes de support à mémoire de forme et ses procédés de fabrication et d'utilisation
EP3792192A1 (fr) * 2019-09-16 2021-03-17 Mondi AG Agencement de sacs d'emballage ainsi que procédé de fabrication et de manipulation de l'agencement de sacs d'emballage

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