EP1094013B1 - Film pour fabriquer un emballage ayent prédécoupe avec une tendance à délamination - Google Patents

Film pour fabriquer un emballage ayent prédécoupe avec une tendance à délamination Download PDF

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Publication number
EP1094013B1
EP1094013B1 EP00402685A EP00402685A EP1094013B1 EP 1094013 B1 EP1094013 B1 EP 1094013B1 EP 00402685 A EP00402685 A EP 00402685A EP 00402685 A EP00402685 A EP 00402685A EP 1094013 B1 EP1094013 B1 EP 1094013B1
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EP
European Patent Office
Prior art keywords
layer
film according
film
scored
precut
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.)
Expired - Lifetime
Application number
EP00402685A
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German (de)
English (en)
French (fr)
Other versions
EP1094013A1 (fr
Inventor
Jean-Claude Jammet
Nathalie Plus
Elisée Brunet
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.)
Soplaril SA
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Soplaril SA
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Filing date
Publication date
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Publication of EP1094013A1 publication Critical patent/EP1094013A1/fr
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Publication of EP1094013B1 publication Critical patent/EP1094013B1/fr
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
    • 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

Definitions

  • the invention relates to a film with precut of the kind that includes at least two layers, one of the layers comprising a material plastic and being precut along at least one line precut to favor the tearing of the film, in especially for opening a package.
  • FR-A-2 757 835 relates to a process for manufacture of packaging from at least one film having an upper layer and a lower layer made of plastic, constituting the external faces and internal of said packaging, and a central layer of metal slight sandwiching between said upper layers and lower. According to this method, at least one line of precut is performed by a laser beam on the bottom layer.
  • EP-A-0 875 369 relates to a manufacturing process packaging with a multilayer film.
  • Layer exterior absorbs laser radiation and has a pre-cut line, produced by laser beam, for facilitate tearing.
  • the bottom layer is formed by a heat-sealable film which does not absorb the beam laser.
  • the tear resistance of the layer pre-cut, outside the pre-cut line, is not compared to each other's tear resistance layer.
  • US-A-5 613 779 relates to a sachet produced with a multilayer film.
  • a layer which can be located at outside or inside, having great resistance tear, has a pre-cut slot.
  • the other layer which is not precut is presented as also having high tear resistance. According to this document, there is therefore no difference sensitive, in tear resistance, for two layers.
  • the object of the invention is, above all, to provide a film comprising at least two layers, one of which is precut along a precut line, and either such as the tear caused by a user follows well the precut line.
  • a film with precut comprising at least two layers, one of the layers comprising a plastic material and being precut along at least one pre-cut line, is characterized by the fact that the precut layer has, out of the pre-cut line, tear resistance greater than 0.3 decanewton (daN), while the other uncut layer has resistance to tear less than 0.07 daN, and that the film has resistance to tearing, out of line pre-cut, equal to at least twice its resistance to tear on the precut line
  • the tear resistance of the pre-cut layer is at least twice as large as that of the other layer.
  • the film may include a layer of aluminum, of paper, cellulose, or the like.
  • Tear resistance is measured by a "pants test" (which derives from standard NFT 54141) performed at 20 ° C, at a speed of 900 mm per minute. The values given are each an average corresponding to a measurement time of 20 seconds, during which the sampling frequency will have been 50 milliseconds. These measurement conditions apply to all given tear resistance values thereafter.
  • the tear resistance of the film out of the precut is at least 0.23 daN (Decanewton).
  • the precut layer has a tear resistance between 0.5 daN and 2 daN (terminals included).
  • the two layers of the film can exhibit a tendency to delamination, which favors monitoring the pre-cut line by tearing.
  • the pre-cut layer may be made of polymer; the polymer term should be understood in a general sense of so that it covers copolymers, terpolymers, interpolymers, polymer blends.
  • Oriented polyamide OPA
  • polyamide cast CPA
  • oriented polypropylene OPP
  • BOPP polypropylene bioriented
  • PE polyethylene
  • PP polypropylene
  • PVC polyvinyl chloride
  • PS polystyrene
  • PMMA polymethyl methacrylate
  • PVDC polychloride divinylidene
  • PVDF polyvinyl divene fluoride
  • PEN polyethylene naphthalate
  • polyester which includes polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), acrylonitrile-butadienestyrene terpolymer (ABS).
  • the nature of the uncut layer can be chosen from the same list of materials as for the pre-cut layer, it being understood that the materials of the two layers undergo different treatments causing their differences in resistance to tear ; in addition, the uncut layer can be made of aluminum or paper.
  • the film generally has a thickness between 30 and 300 ⁇ m.
  • the precut layer represents at least 20% of the total thickness of the film and preferably at least 50% or even 95% of the thickness total.
  • the uncut layer usually has a thickness between 1 and 60 ⁇ m.
  • the cut layer and the non layer pre-cut have a minimum of adhesion between them so as to constitute a film. It is however preferable that the adhesion between these two layers is not too strong, so there is a tendency to delamination (separation of the two sheets) under the effect mechanical stress, for example during a tear.
  • Organic matter can be a couple glue / varnish, delamination occurring at the interface layers of glue and varnish.
  • Each layer, pre-cut or not pre-cut, can of course be itself constituted by a assembly of several layers.
  • the diapered layer includes a non-material layer plastic, like a paper diaper.
  • the invention also relates to a packaging, in particular of the sachet type, produced with a film as defined above, packaging which is wish to be able to open by hand in a controlled manner.
  • packaging made with a film according to the invention, the precut line is located under a sealing line which impermeability to the packaging.
  • Figure 1 of these drawings is a section schematic, on a large scale, of a film of matter plastic according to the invention.
  • FIGS 2 to 5 show, similarly to the Figure 1, alternative embodiments of the film material plastic.
  • Figure 6 finally, is an elevational view of a sachet type packaging made with a film according to the invention.
  • a film F comprising two layers I and D of plastic material.
  • Layer I is precut according to minus a line L, perpendicular to the plane of the figure 1, to promote the tearing of the film, in particular for opening a package.
  • Pre-cut layer I has resistance to the tear, outside the precut line L, higher than that of layer D, and the film F has resistance to tearing, out of line precuts L, at least twice its resistance to the tear on the precut line L.
  • the tear resistance of film F, out of the precut L is at least 0.23 daN (decanewton).
  • the resistance of layer I to the tear is at least twice as large as that of the other layer D.
  • the layer I has, outside the line L, a tear resistance greater than 0.3 daN, while the other layer D has a tear resistance less than 0.07 daN.
  • layer I has a tear resistance between 0.5daN and 2daN.
  • Layer I is made of polymer, the term polymer to be understood in a general sense which covers the copolymers, terpolymers, interpolymers, mixtures of polymers.
  • Oriented polyamide OPA
  • polyamide cast CPA
  • oriented polypropylene OPP
  • BOPP polypropylene bioriented
  • PE polyethylene
  • PP polypropylene
  • PVC polyvinyl chloride
  • PS polystyrene
  • PMMA polymethyl methacrylate
  • PVDC polychloride divinylidene
  • PVDF polyvinyl divene fluoride
  • PEN polyethylene naphthalate
  • polyester which includes polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), acrylonitrile-butadienestyrene terpolymer (ABS).
  • layer D can be chosen in the same list of materials as for layer I. treatments applied to these materials are however different for layers I and D, to get the differences in tear resistance.
  • Layer D can also be made of aluminum or paper.
  • Layers I and D are combined by a process state-of-the-art classic adapted to nature layers.
  • association can be made by lamination, using a layer of C adhesive to combine layers D and I.
  • layer D is aluminum
  • layer I is made of a polyolefin such as polyethylene (PE) or polypropylene (PP).
  • the film F generally has a thickness e between 30 and 300 ⁇ m.
  • Layer I represents at least 20% of the total thickness e of the film, and preferably at least 50% or even 95% of this total thickness e.
  • Layer D generally has a thickness between 1 and 60 ⁇ m.
  • the film F retains a perfect seal since the precut does not pass through it not completely.
  • the precut line L is a line in dotted, perpendicular to the plane of Figure 1, constituted by a succession of holes t which have generally a length (perpendicular to the plane of Figure 1) between 1 mm and 1 cm.
  • the length no perforated between two holes is between 0.1 and 5 mm.
  • the cut along the dotted line L of the layer I can be done mechanically, generally by a toothed blade in the form of a wheel. Roulette rolls on the moving film and perforates without removing material layer I along a dotted line.
  • Such mechanical cutting is generally performed on layer I before its assembly with the layer D.
  • the realization of the precut line L can be provided by other methods, for example by a pre-cut with a pulsed laser beam allowing make a series of holes of reduced diameter.
  • Such laser cutting can be performed in layer I before or after its assembly with the layer D.
  • the precut must be performed so that the tear resistance of the attachment points (between two holes) is less than the resistance to tear outside the precut. This is obtained in bringing the holes close enough so that the tear behavior between holes either different and influenced by the presence of the holes by relative to an area free of holes. It is the same for the pre-cut layer itself.
  • the precut crosses entirely the pre-cut layer. This is more easily achieved if the layer is precut before being associated, by example by gluing, to the other layers for the film making. Indeed, in this way, the means of precut can be more straightforward without risking precut other layers that are not intended to being.
  • Mechanical cutting is preferred over laser cutting. Indeed, the laser impact creates a crater on the surface of the film. This crater is an obstacle to the spread of the tear in the precut line and may tend to diverge the spread of the tear in the precut line.
  • a laser cutting requires the presence of a layer of aluminum which reflects the laser light. A mechanical precut on one of the layers, in particular before assembly, eliminates the need a layer of aluminum in the film.
  • Layers I and D assembled have a minimum adhesion between them so as to constitute the film F. It is advantageous that the adhesion between the two layers I and D is not too strong, so the film F has a tendency to delamination (separation of layers I and D) when subjected to tearing or shearing forces.
  • the resistance to delamination is less than 0.2 daN / 15 mm. Resistance to delamination is measured by a T-peel test at 180 ° angle with a speed of 300 mm per minute, on a strip 15 mm wide.
  • V varnish may include an incoming resin in the composition of inks commonly used in rotogravure or flexogravure.
  • layer I is formed by the assembly of a layer 1 of polyethylene PE and layer V of varnish which adheres to the inner face of layer 1, in the area of the line precut L.
  • Layer D is formed by joining a layer 2 of oriented polypropylene (OPP) and glue layer C.
  • OPP oriented polypropylene
  • Figure 3 illustrates an alternative embodiment of a film F of FIG. 2.
  • the layer of varnish V according to Figure 3, is located at the interface of the layer of glue C and OPP layer 2 in the line area precut L. The adhesion is reduced to the interface of the adhesive layer C and the varnish V.
  • Layer I in the case of Figure 3, is formed by the assembly of layer 1 of polyethylene and glue layer C, while layer D includes the assembly of layer 2 and layer V of varnish.
  • Figure 4 illustrates a first example of a such structure.
  • the precut line L is made in layer 1 of PE, which is associated by a layer of glue C to layer 2 of OPP.
  • the face of the layer 1 of PE in contact with the adhesive layer C has undergone Corona treatment with the exception of marked area 3a by dashes to the right of line L.
  • This zone 3a does not Corona treated promotes delamination at this location between layer 1, constituting layer I, and the whole layer 2 and glue C constituting layer D.
  • Figure 5 shows a variant of the structure of FIG. 4, according to which the face of layer 2 of OPP intended to come into contact with the adhesive layer C underwent Corona treatment with the exception of zone 3b, marked with dashes, to the right of line L.
  • This Corona untreated zone 3b promotes delamination between layer 2 and layer of glue C.
  • the whole of the layer 1 of PE and the layer of adhesive C constitutes the layer I while layer D consists of the single layer 2.
  • the PET / glue association is considered to be forming the uncut layer.
  • the thickness of the PET layer is 12 ⁇ m.
  • the thickness of the layer of glue is equal to 1.8 ⁇ m.
  • the glue is of the type polyurethane.
  • the PET / glue layer has resistance to tear (abbreviated: RD) less than 0.05 daN.
  • the thickness of the LDPE layer is equal to 80 ⁇ m.
  • the LDPE layer has an RD (resistance to tear) of 0.8 daN.
  • the film has an RD of 0.07 daN on the precut and 0.8 daN without precut.
  • PET layer can be printed inside or outside, or not be printed at all.
  • the precut L is made in the layer of LDPE by mechanical cutting before laminating on the PET, with a length of each hole equal to 3 mm and a distance between holes equal to 2 mm.
  • the thickness of the PET layer can be between 5 and 30 ⁇ m.
  • the thickness of the layer of glue can be between 1 and 4 ⁇ m.
  • the thickness of the LDPE layer can be between 40 and 200 ⁇ m.
  • the PET layer has a thickness of 12 ⁇ m.
  • the thickness of the adhesive layer, between PET and aluminum, is equal to 2 ⁇ m.
  • the thickness of the layer of aluminum is equal to 9 ⁇ m.
  • the thickness of the layer of glue between aluminum and LDPE is equal to 2 ⁇ m.
  • the association PET / glue / aluminum / glue is the uncut layer that has an RD less than 0.05 daN.
  • the thickness of the LDPE layer is equal to 140 ⁇ m.
  • the LDPE layer has an RD of 0.8 daN.
  • the complex film has an RD of 0.22 daN on the precut and 1.5 daN excluding precut.
  • the precut L is made in the LDPE layer before assembly, because do not risk damaging the diaper aluminum which acts as a barrier against gas and moisture.
  • the length of each hole is equal to 3 mm and the distance between holes equal to 2 mm.
  • the PET layer may have a thickness between 5 and 30 ⁇ m.
  • the thickness of the adhesive layer, between PET and aluminum, is included between 1 and 4 ⁇ m.
  • the thickness of the aluminum layer is between 6 and 45 ⁇ m.
  • the thickness of the layer of glue between aluminum and LDPE is included in the same limits than those of the first layer of glue.
  • the thickness of the LDPE layer is between 40 and 200 ⁇ m.
  • This example differs from the previous one by the replacing the LDPE layer with a PP layer (polypropylene) which allows the realization of a packaging sterilizable.
  • the PET layer has a thickness of 12 ⁇ m.
  • the thickness of the adhesive layer is 1.8 ⁇ m.
  • the PET / glue association has an RD of less than 0.05 daN.
  • the PP layer has a thickness equal to 100 ⁇ m and an RD equal to 0.9 daN.
  • the film has an RD of 0.1 daN on the precut and an RD of 0.45 daN excluding precut.
  • the length of each pre-cut hole is 4 mm and the distance between holes equal to 1 mm.
  • the thicknesses of the different layers are within the same limits as those data for the second example, the limits given for the LDPE layer applying to those of PP.
  • the PET layer has a thickness of 12 ⁇ m.
  • the adhesive layers are 2 ⁇ m thick.
  • the aluminum layer has a thickness equal to 9 ⁇ m.
  • the BOPA (biaxially oriented polyamide) layer has a thickness equal to 15 ⁇ m.
  • the PP layer has a thickness equal to 60 ⁇ m.
  • the PET layer has a thickness between 5 and 30 ⁇ m.
  • Glue layers have a thickness between 1 and 4 ⁇ m.
  • Layer aluminum has a thickness between 6 and 45 ⁇ m.
  • layer of BOPA bi-oriented polyamide
  • the PP layer has a thickness between 40 and 200 ⁇ m.
  • the BOPA layer or possibly the layer OPA (oriented polyamide) has the advantage of protecting the aluminum layer which tends to puncture when the film is folded, and improves the strength of the packaging to shocks.
  • the glue can be a solvent-based adhesive of polyurethane type, or solvent-free polyurethane type, or on an acrylic base.
  • layers D and I can be each formed from an assembly of several layers.
  • the film F can be used to make any type of packaging you want to be able to open hand in a controlled manner.
  • Figure 6 illustrates such packaging made up by a bag 4 made with film F, this bag containing a liquid, for example a food liquid such as a sauce.
  • a liquid for example a food liquid such as a sauce.
  • the bag 4 has a bellows bottom 5 of which the cross section in the middle part a substantially a W shape when the bag is empty and flattened, the bottom being able to open during filling to constitute a seat allowing the stand up bag.
  • the bag has two side walls, by example of rectangular shape, which are welded one to the other along their longitudinal edges.
  • the precut line L is provided in the film on the side opposite the bottom 5.
  • a line of precut L is provided on each side of the bag 4.
  • the precut line L is located under a line of solder 6 which closes the bag tightly.
  • the walls of the bag are of course tight the location of the precut line L due to the continuity of layer D at this location.
  • the bag 4 is opened by tearing the film at line L.
  • the tear with the film F of the invention, propagates exactly according to the line L without deviating towards the bottom 5 of the bag which would be particularly unfortunate because the liquid in the sachet could spread uncontrollably.
  • the tear is carried out well according to the line L thanks to the combination of layer D and layer I, more difficult to tear, in which is planned the precut.
  • the skilled person can, for given materials, both on the one hand increase the thickness of the precut layer, and on the other hand, increase the length actually cut on the line by cutting out the length of the holes and decreasing the distance between the holes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Cartons (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
EP00402685A 1999-10-18 2000-09-29 Film pour fabriquer un emballage ayent prédécoupe avec une tendance à délamination Expired - Lifetime EP1094013B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9912946A FR2799742B1 (fr) 1999-10-18 1999-10-18 Film avec predecoupe, procede de fabrication du film et emballage realise avec un tel film
FR9912946 1999-10-18

Publications (2)

Publication Number Publication Date
EP1094013A1 EP1094013A1 (fr) 2001-04-25
EP1094013B1 true EP1094013B1 (fr) 2004-08-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00402685A Expired - Lifetime EP1094013B1 (fr) 1999-10-18 2000-09-29 Film pour fabriquer un emballage ayent prédécoupe avec une tendance à délamination

Country Status (7)

Country Link
EP (1) EP1094013B1 (es)
AT (1) ATE273198T1 (es)
DE (1) DE60012842T2 (es)
DK (1) DK1094013T3 (es)
ES (1) ES2225048T3 (es)
FR (1) FR2799742B1 (es)
PT (1) PT1094013E (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2522595A1 (de) 2011-05-12 2012-11-14 Nordenia Deutschland Halle GmbH Mehrschichtige Folie für Aufreißverpackungen

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003039990A1 (en) * 2001-11-05 2003-05-15 Malcolm Leslie Parker Easy open sachet for an alcoholic beverage
US7862869B2 (en) 2003-10-20 2011-01-04 Milprint, Inc. Tear initiation and directional tear films and packages made therefrom
EP1974894A1 (fr) * 2007-03-24 2008-10-01 Aisapack Holding SA Zone de déchirure pour film en plastique
DE102009008217A1 (de) 2009-02-10 2010-08-19 Lts Lohmann Therapie-Systeme Ag Kindergesicherte, hochinerte Einzelverpackung
DE102009050419A1 (de) * 2009-10-22 2011-04-28 Sig Technology Ag Perforierter Behälter aus einem flächenförmigen Verbund mit mindestens einer außenseitigen Polyamidschicht sowie ein Verfahren zu dessen Herstellung
US8814430B2 (en) 2010-02-23 2014-08-26 Kraft Foods R&D, Inc. Food package having opening feature
EP2583910A1 (en) * 2011-10-21 2013-04-24 Amcor Flexibles Italia S.R.L. Packaging with tearing aid
DE102012205489A1 (de) * 2012-04-03 2013-10-10 Huhtamaki Ronsberg Zn Der Huhtamaki Deutschland Gmbh & Co. Kg Folienverbund zur Herstellung einer Folienverpackung und Folienverpackung mit vorbereiteter Zweitbestimmung nach Fortfall der Verpackungsfunktion
CN103101287B (zh) * 2013-02-19 2015-04-01 黄山永新股份有限公司 重包装复合膜的制备方法
EP3081374B1 (de) * 2015-04-14 2017-06-28 Mondi AG Kunststoffgewebeverbund, verpackungsbeutel aus einem kunststoffgewebeverbund sowie verfahren zur herstellung eines verpackungsbeutels

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139643A (en) * 1977-12-06 1979-02-13 The Procter & Gamble Company Snack food package
US5158499A (en) * 1990-07-09 1992-10-27 American National Can Company Laser scoring of packaging substrates
US5613779A (en) * 1994-11-30 1997-03-25 Kabushiki Kaisha Hosokawa Yoko Pouch
FR2757835B1 (fr) 1996-12-31 1999-03-19 Unisabi Sa Procede de fabrication d'un emballage et emballage a predecoupe laser
US6074097A (en) * 1997-04-28 2000-06-13 Dai Nippon Printing Co., Ltd. Package, package manufacturing method and package manufacturing system for carrying out the package manufacturing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2522595A1 (de) 2011-05-12 2012-11-14 Nordenia Deutschland Halle GmbH Mehrschichtige Folie für Aufreißverpackungen

Also Published As

Publication number Publication date
FR2799742B1 (fr) 2002-06-07
ATE273198T1 (de) 2004-08-15
DE60012842T2 (de) 2005-09-01
EP1094013A1 (fr) 2001-04-25
DK1094013T3 (da) 2004-12-13
DE60012842D1 (de) 2004-09-16
PT1094013E (pt) 2004-11-30
ES2225048T3 (es) 2005-03-16
FR2799742A1 (fr) 2001-04-20

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