EP1751025A1 - Sac a fond plat a caracteristique de dechirure amelioree, et procede de realisation - Google Patents

Sac a fond plat a caracteristique de dechirure amelioree, et procede de realisation

Info

Publication number
EP1751025A1
EP1751025A1 EP05744962A EP05744962A EP1751025A1 EP 1751025 A1 EP1751025 A1 EP 1751025A1 EP 05744962 A EP05744962 A EP 05744962A EP 05744962 A EP05744962 A EP 05744962A EP 1751025 A1 EP1751025 A1 EP 1751025A1
Authority
EP
European Patent Office
Prior art keywords
stand
pouch
stretched film
unidirectionally stretched
pouch according
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.)
Ceased
Application number
EP05744962A
Other languages
German (de)
English (en)
Inventor
Christian Fenn-Barrabass
Walter Günter
Josef Müller
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.)
Huhtamaki Ronsberg Zweigniederlassung der Huhtamaki Deutschland GmbH and Co KG
Original Assignee
Huhtamaki Ronsberg Zweigniederlassung der Huhtamaki Deutschland GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34424598&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1751025(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Huhtamaki Ronsberg Zweigniederlassung der Huhtamaki Deutschland GmbH and Co KG filed Critical Huhtamaki Ronsberg Zweigniederlassung der Huhtamaki Deutschland GmbH and Co KG
Publication of EP1751025A1 publication Critical patent/EP1751025A1/fr
Ceased legal-status Critical Current

Links

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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5805—Opening or contents-removing devices added or incorporated during package manufacture for tearing a side strip parallel and next to the edge, e.g. by means of a line of weakness
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/008—Standing pouches, i.e. "Standbeutel"

Definitions

  • the invention relates to a stand-up pouch and a method for its production according to the preambles of claims 1 and 13.
  • Stand-up pouches of the type mentioned are often used as a replacement for bags, but also bottles, cans and boxes, for packaging solid, liquid and pasty food and beverages as well as for everyday objects of all kinds.
  • Stand-up pouches have numerous advantages over the above-mentioned conventional packaging, firstly their light weight, their excellent durability combined with simple and inexpensive manufacture, and also their unproblematic disposability.
  • a stand-up pouch according to patent claim 1 and by a method for its production according to patent claim 13.
  • the object is achieved by a stand-up pouch with a stand-up pouch body and a stand-up pouch base, in particular a standing base, wherein at least the stand-up pouch body comprises at least one unidirectionally stretched film.
  • a stand-up pouch is understood to be any container formed from a film and / or a laminate, in particular also tubular pouches, with or without a separate or connected bottom and / or shoulder and / or lid part ,
  • An important point of the invention lies in the fact that in a unidirectionally stretched film the molecular chains forming the film are aligned and arranged essentially parallel in the stretching direction. As a result, a splittability of the stretched material parallel to the stretching direction is preferred over a direction angled to it, so that an oblique tearing by the aligned molecular chains is made significantly more difficult or impossible.
  • a further advantage of using a unidirectionally stretched film is that when splitting or tearing such a film parallel to the direction of stretching, no molecular chains have to be cut or torn from a molecular composite, since the molecular chains forming the material are not convoluted, but rather more or less smoothly next to one another are arranged. In this way, tearing such a unidirectionally stretched film parallel to the stretching direction requires a significantly reduced tear strength compared to conventional films, which is up to 50% to 60% below the tear strength that would be necessary for a conventional unstretched or bidirectionally stretched film.
  • a stand-up pouch which is made at least in a tear-open area from a unidirectionally stretched film, shows a tear-open behavior that is optimized compared to conventional stand-up pouches, with a smooth and uniform tear-open edge that follows the stretching direction. It is not to be feared with such a stand-up pouch that a tear runs uncontrollably over the entire stand-up pouch body, so that even stand-up pouches with a liquid content can be torn open without any problem, without fear of loss of the pouch content.
  • At least a part of the stand-up pouch body that can be torn open is formed from at least one unidirectionally stretched film.
  • the entire stand-up pouch body as well as the stand-up pouch stand or stand-up floor and the stand-up pouch cover or a shoulder part connected to them can also be produced from such a unidirectionally stretched film.
  • the unidirectionally stretched film is part of a laminate, which can have a barrier layer.
  • the unidirectional film has at least one polyolefin and / or an ester, with polyethylene and / or polypropylene and / or polyethylene terephthalate being preferred materials.
  • the optional barrier layer can consist, for example, of ethyl vinyl alcohol (EVOH) or a metal that is vapor-deposited on the laminate, or can be used as a film.
  • EVOH ethyl vinyl alcohol
  • Another barrier layer material includes, for example, glass-like substances that can contain SiO 2 .
  • the aforementioned materials can be used in the case of polyethylene and / or polypropylene pure, but also as a coextrudate and in conjunction with polyethylene terephthalate.
  • Aluminum is particularly suitable as a metal, although, depending on the application, other, preferably corrosion-resistant metals can also be used.
  • the barrier layer is arranged on at least one sealable layer and is preferably embedded, for example, between polyethylene terephthalate and polypropylene or polyethylene.
  • a multilayer laminate with a plurality of barrier layers can also be provided, preferably at least one of the outermost layers, in particular the outermost layer, being sealable.
  • the unidirectionally stretched film it can also be a matter of several unidirectionally stretched films — has a greater thickness in relation to further layers of the laminate.
  • the thickness of the unidirectionally stretched film is greater than that of the remaining further layers of the laminate, the thickness of a unidirectionally stretched film in the range from 10 ⁇ m to 200 ⁇ m, preferably in the range from 35 ⁇ m to 155 ⁇ m and particularly preferably in the range from 45 ⁇ m to 95 ⁇ m.
  • the stand-up pouch produced by means of the unidirectionally stretched film can be sterilized.
  • the film material Polypropylene is preferably provided, while for stand-up pouches that do not require sterilizability, polyethylene is a preferred, inexpensive and suitable material.
  • the stand-up pouch body is extruded in tubular form or produced as a lap or fin seal, which results in an optimized round shape of the stand or Tubular bag body contributes.
  • the stability of the stand-up pouch is largely ensured by at least one unidirectionally stretched film, the use of polyethylene terephthalate for mechanical stability and the use of polypropylene and / or polyethylene making a significant contribution to the dimensional stability.
  • a tear-open aid in particular a notch or the like, direction-defining weakening, is provided on the stand-up pouch body, for example on a sealing seam, by means of which a further tear-open of the stand-up pouch can be initiated parallel to a unidirectional stretching direction of the unidirectionally stretched film.
  • Such a tear-in or tear-open aid ensures that the tubular bag is torn in a targeted manner, the tear-off tip or notch pointing in the direction of the standing bag opening into the later opening seam or leading to the opening split of the unidirectionally stretched film.
  • the object according to the invention is achieved by a method for producing a stand-up pouch, which is characterized by the following steps:
  • a polyolefin and / or polyamide such as polyethylene or polypropylene or a coextrudate thereof is used to produce the thick film. It is also possible to use polyethylene terephthalate to produce the thick film.
  • steps a) to c) simultaneously or quasi-simultaneously, in particular in the course of coextrusion. It is possible here to apply a barrier layer directly or between layers of the laminate during the production of the laminate.
  • the laminate flat is also possible to produce the laminate flat as a film or as a fin- or lap-seal tube or, in particular, to extrude it and, if necessary, to seal it.
  • a stand-up pouch according to the invention is produced by first producing a thick film from polypropylene and from polyethylene terephthalate.
  • the polyethylene terephthalate and polypropylene thick film is stretched unidirectionally in the machine direction.
  • An aluminum layer with a layer thickness of 8 ⁇ m is then applied to the stretched polypropylene film, which has a layer thickness of 70 ⁇ m.
  • the aforementioned stretched polyethylene terephthalate layer which has a thickness of 12 ⁇ m, is in turn laminated onto the aluminum layer.
  • the laminate with barrier properties produced in this way is formed into a tubular shape by means of a lap-seal connection to form a tubular bag body, into which a bottom part with a barrier property, for example a deep-drawn bottom part, is sealed on the bottom side.
  • the tubular bag is sealed at the top using a fin-seal seal.
  • a notch is arranged in a lower limit of the fin-seal seal such that when the tubular bag is torn open, the top-side fin-seal secondary seal is removed and the tubular bag is opened.
  • the tubular bag By removing the fin-seal sealing on the head side, by means of which the tubular bag was held together at the head side in the closed state, the tubular bag can now unfold again in accordance with its round tubular body shape, so that the level of the bag contents now drops somewhat due to the widening of the bag , and spillage of the contents of the bag is also avoided.
  • a thick film of polypropylene is first produced, which is then unidirectionally stretched in the machine direction until a layer thickness of the stretched polypropylene film of 70 ⁇ m is reached.
  • Another thick film made of polyethylene terephthalate is also stretched unidirectionally in the machine direction until a layer thickness of the stretched polyethylene terephthalate film of about 12 ⁇ m is reached.
  • a flat laminate is produced from these two stretched foils together with an aluminum foil with a layer thickness of 8 ⁇ m arranged between them.
  • Foil blanks are cut from this laminate for the respective front and back sides of a stand-up pouch body. The respective outer edges of the front and back sides of the laminate are sealed together to a width of approx. 3 mm.
  • the bottom of the stand-up pouch is made by sealing a V-shaped blank.
  • the stand-up pouch is closed at the top after filling, for example by means of a fin-seal seal. Furthermore, a tear-off aid in the form of a notch is attached to the side fin-seal seal, by means of which a further tearing open of the stand-up pouch can be initiated.
  • the tear aid can be provided on the stand-up pouch on one or both sides.
  • an embossing can be provided adjacent to the tear line predefined by means of the tear-open notch and the direction of stretching.

Abstract

La présente invention concerne un sac à fond plat comprenant un corps et un fond, en particulier un fond d'immobilisation verticale, au moins le corps du sac comprenant au moins un film étiré de façon unidirectionnelle. L'invention a également pour objet un procédé pour réaliser un sac à fond plat de ce type.
EP05744962A 2004-05-17 2005-05-13 Sac a fond plat a caracteristique de dechirure amelioree, et procede de realisation Ceased EP1751025A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004024348 2004-05-17
DE102004026980A DE102004026980B4 (de) 2004-05-17 2004-06-03 Standbeutel mit optimiertem Aufreißverhalten und Verfahren zu seiner Herstellung
PCT/EP2005/005290 WO2005113370A1 (fr) 2004-05-17 2005-05-13 Sac a fond plat a caracteristique de dechirure amelioree, et procede de realisation

Publications (1)

Publication Number Publication Date
EP1751025A1 true EP1751025A1 (fr) 2007-02-14

Family

ID=34424598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05744962A Ceased EP1751025A1 (fr) 2004-05-17 2005-05-13 Sac a fond plat a caracteristique de dechirure amelioree, et procede de realisation

Country Status (11)

Country Link
US (2) US20080101733A1 (fr)
EP (1) EP1751025A1 (fr)
JP (1) JP2007537938A (fr)
CN (1) CN101891034A (fr)
BR (1) BRPI0511155A (fr)
CA (1) CA2565916A1 (fr)
DE (3) DE102004026980B4 (fr)
MX (1) MXPA06013265A (fr)
NZ (1) NZ551038A (fr)
RU (1) RU2376227C2 (fr)
WO (1) WO2005113370A1 (fr)

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DE102004026980A1 (de) 2005-12-08
JP2007537938A (ja) 2007-12-27
NZ551038A (en) 2009-10-30
CA2565916A1 (fr) 2005-12-01
MXPA06013265A (es) 2007-04-16
US20080101733A1 (en) 2008-05-01
RU2376227C2 (ru) 2009-12-20
CN101891034A (zh) 2010-11-24
DE102004026980B4 (de) 2007-01-18
DE202005021704U1 (de) 2009-10-15
RU2006144816A (ru) 2008-06-27
BRPI0511155A (pt) 2007-12-04
US20120010060A1 (en) 2012-01-12
WO2005113370A1 (fr) 2005-12-01
DE202004016420U1 (de) 2005-03-24

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