WO2009098730A2 - High-strength and high-transparency extendable multilayer film - Google Patents

High-strength and high-transparency extendable multilayer film Download PDF

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Publication number
WO2009098730A2
WO2009098730A2 PCT/IT2009/000047 IT2009000047W WO2009098730A2 WO 2009098730 A2 WO2009098730 A2 WO 2009098730A2 IT 2009000047 W IT2009000047 W IT 2009000047W WO 2009098730 A2 WO2009098730 A2 WO 2009098730A2
Authority
WO
WIPO (PCT)
Prior art keywords
layer
copolymer
adhesivizing
monomer
extendable
Prior art date
Application number
PCT/IT2009/000047
Other languages
French (fr)
Other versions
WO2009098730A3 (en
Inventor
Antonio Garegnani
Original Assignee
Akro-Flex S.A.S. Di Garegnani Antonio & C.
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 Akro-Flex S.A.S. Di Garegnani Antonio & C. filed Critical Akro-Flex S.A.S. Di Garegnani Antonio & C.
Priority to DE200921000027 priority Critical patent/DE212009000027U1/en
Publication of WO2009098730A2 publication Critical patent/WO2009098730A2/en
Publication of WO2009098730A3 publication Critical patent/WO2009098730A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/04—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a layer being specifically extensible by reason of its structure or arrangement, e.g. by reason of the chemical nature of the fibres or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

Definitions

  • the present invention relates to the ' packaging
  • said extendable film is a multilayer film and comprises at least three layers: an adhesivizing layer, a copolymer or monomer layer, and a layer of linear material.
  • the main task of the present invention is to overcome this drawback by providing an extendable film for packaging characterized t by high strength and transparency.
  • an extendable multilayer film which comprises at least three layers: an adhesivizing layer, a copolymer or monomer layer, such as, for example, polypropylene, and a layer of linear material.
  • the layer of linear material is set between the adhesivizing layer designed to come into contact with the product to be packaged and the copolymer or monomer layer.
  • Figure 1 shows a first embodiment of a film made up of three layers: an adhesivizing layer, a polypropylene layer, and a layer of linear material set between the first two layers, in which the layer of linear material is set between the other two layers;
  • Figure 2 shows a second embodiment of a film, similar to that of Figure 1, in which the polypropylene layer is set between the layer of linear material and the adhesivizing layer.
  • a high-strength extendable film having a particularly high degree of transparency which comprises three layers: a first, adhesivizing, layer 1, a second layer 2 made of linear material, and a third layer 3 made of copolymer or monomer, where said second layer 2 of linear material is set between the adhesivizing layer 1 and the copolymer or monomer layer 3.
  • the film with three payers has an adhesivizing surface to be positioned in contact with the product to be packaged, and a copolymer or monomer surface, opposed to said adhesivizing surface, facing outwards.
  • the first, adhesivizing, layer 1 in direct contact with said reel, is coupled to the second layer 2 of linear material and, the latter is coupled to the third, copolymer or monomer, layer 3.
  • the linear material of the second layer 2 to have a weight percentage of from 20 wt% to 90 wt% and for the copolymer or monomer of the third layer 3 to have a weight percentage of from 80 wt% to 10 wt%.
  • the second layer 2 will have 60 wt% of linear material and that the third layer 3 will have 40 wt% of copolymer or monomer.
  • said linear material is moreover preferable for said linear material to be a metallocenic-catalysis material in order to enhance the resistance to perforation.
  • said third layer 3 is a polypropylene layer.
  • an extendable multilayer film is provided similar to the one described so far, in which, however, the copolymer or monomer layer 3 is set between the adhesivizing layer 1 and the layer 2 of linear material.
  • the films described are provided with a greater stiffness as compared to traditional films and a modest elastic return. This enables particularly rigid packagings to be obtained without the palletized freight being deformed by the normal elastic return.
  • the copolymer or monomer of the third layer 3 ' it is preferable for the copolymer or monomer of the third layer 3 ' to be a copolymer of a random type.

Abstract

An extendable film for packaging having a high strength and high degree of transparency, which comprises a plurality of layers: an adhesivizing layer, a copolymer or monomer layer, and layer of linear material.

Description

HIGH-STRENGTH AND HIGH-TRANSPARENCY EXTENDABLE
MULTILAYER FILM
*****
The present invention relates to the ' packaging
^sector, and regards, in particular, to an innovative extendable film made of plastic material characterized by a higher strength and degree of transparency as compared to traditional extendable films.
More specifically, said extendable film is a multilayer film and comprises at least three layers: an adhesivizing layer, a copolymer or monomer layer, and a layer of linear material. Currently known on the market are extendable films, which, albeit having a certain degree of transparency, do not enable the label of the product that is packaged by means of the film itself to be read easily. This entails the drawback that, if a person wishes to read the^ label of the product packaged properly, he has to tear the package at least partially.
Consequently, the main task of the present invention is to overcome this drawback by providing an extendable film for packaging characterized t by high strength and transparency.
The above has been obtained, according to the invention; by providing an extendable multilayer film, which comprises at least three layers: an adhesivizing layer, a copolymer or monomer layer, such as, for example, polypropylene, and a layer of linear material.
It is preferable for the layer of linear material to be set between the adhesivizing layer designed to come into contact with the product to be packaged and the copolymer or monomer layer.
A better understanding of the invention will be obtained from the ensuing detailed description and with reference to the attached drawings, which illustrate, purely by way of example, two preferred embodiments. In the drawings :
Figure 1 shows a first embodiment of a film made up of three layers: an adhesivizing layer, a polypropylene layer, and a layer of linear material set between the first two layers, in which the layer of linear material is set between the other two layers;
Figure 2 shows a second embodiment of a film, similar to that of Figure 1, in which the polypropylene layer is set between the layer of linear material and the adhesivizing layer.
With reference to Figure 1, in the first embodiment described, a high-strength extendable film having a particularly high degree of transparency is provided, which comprises three layers: a first, adhesivizing, layer 1, a second layer 2 made of linear material, and a third layer 3 made of copolymer or monomer, where said second layer 2 of linear material is set between the adhesivizing layer 1 and the copolymer or monomer layer 3.
According to a peculiar characteristic of the invention, the film with three payers has an adhesivizing surface to be positioned in contact with the product to be packaged, and a copolymer or monomer surface, opposed to said adhesivizing surface, facing outwards. In other words, as. may be seen in Figure 1, on a gathering reel, the first, adhesivizing, layer 1, in direct contact with said reel, is coupled to the second layer 2 of linear material and, the latter is coupled to the third, copolymer or monomer, layer 3. According to the invention, considering only the overall weight of the second layer 2 and of the third layer 3, it is preferable for the linear material of the second layer 2 to have a weight percentage of from 20 wt% to 90 wt% and for the copolymer or monomer of the third layer 3 to have a weight percentage of from 80 wt% to 10 wt%.
For example, it is envisaged that the second layer 2 will have 60 wt% of linear material and that the third layer 3 will have 40 wt% of copolymer or monomer. It is moreover preferable for said linear material to be a metallocenic-catalysis material in order to enhance the resistance to perforation.
In the example described, said third layer 3 is a polypropylene layer. In the second embodiment shown in Figure 2, an extendable multilayer film is provided similar to the one described so far, in which, however, the copolymer or monomer layer 3 is set between the adhesivizing layer 1 and the layer 2 of linear material. Advantageously, as already mentioned, the films described are provided with a greater stiffness as compared to traditional films and a modest elastic return. This enables particularly rigid packagings to be obtained without the palletized freight being deformed by the normal elastic return.
Finally, according to the invention, it is preferable for the copolymer or monomer of the third layer 3' to be a copolymer of a random type.
The present invention has been described and illustrated according to two preferred embodiments, but it is understood that modifications and/or equivalent replacements may be made by any person skilled in the branch, without thereby departing from the sphere of protection of the present industrial patent right. For example^, it is possible to provide an extendable film having one or more further layers added or set between the ones described so far.

Claims

1) An extendable multilayer film made of plastic material, in particular for packaging, characterized in that it comprises at least three layers: a first layer
(1) made of adhesivizing material, a second layer (2) made of linear material, and a third layer (3) made of copolymer or monomer.
2) The film according to the preceding claim, characterized in that said second layer (2) of linear material is set between said first, adhesivizing, layer (1) and said third layer (3) made of copolymer or monomer; thus obtaining that said extendable multilayer film has a particularly transparent appearance and presents an adhesivizing surface to be positioned in contact with the product to be packaged and a copolymer or monomer surface, opposed to said adhesivizing surface, facing outwards.
3) The film according to Claim 1, characterized in that said third, copolymer or monomer, layer (3) is set between said first, adhesivizing, layer (1) and said second layer (2) of linear material; thus obtaining that said extendable multilayer film presents an adhesivizing surface to be positioned in contact with the product to be packaged and a surface of linear' material, opposed to said adhesivizing surface, facing outwards.
4) The film according to any one of the preceding claims, characterized in that said third layer (3) is a polypropylene layer.
5) The film according to Claim 2 or Claim 3, characterized in that, considering only the overall weight of the second layer (2) and of the third layer (3), the linear material of the second layer (2) has a weight percentage of from 20 wt% to 90 wt%, whereas the copolymer or monomer of the third layer (3) is present in a weight percentage of from 80 wt% to 10 wt%.
6) The film according to the preceding claim, characterized in that the second layer (2) has 60 wt% of linear material and in that the third layer (3) has 40 wt% of copolymer or monomer. 7) The film according to any one of the preceding claims, characterized in that said linear material is a metallocenic-catalysis material for enhancing the resistance to perforation.
8) The film according to Claim 1, characterized in that it comprises one or more further layers added to or set between the preceding three layers (1, 2, 3) .
9) The film according to any one of the preceding claims, characterized in that said third layer (3) is a layer of copolymer of a random type. 10) A high-strength and high-transparency extendable film, in particular for packaging, substantially as described and illustrated in the present description and in the attached drawings.
PCT/IT2009/000047 2008-02-08 2009-02-09 High-strength and high-transparency extendable multilayer film WO2009098730A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200921000027 DE212009000027U1 (en) 2008-02-08 2009-02-09 High-strength and highly transparent, stretchable, multilayer film

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM2008A00073 2008-02-08
ITRM20080073 ITRM20080073A1 (en) 2008-02-08 2008-02-08 MULTILAYER EXTENSIBLE FILM WITH HIGH RESISTANCE AND TRANSPARENCY

Publications (2)

Publication Number Publication Date
WO2009098730A2 true WO2009098730A2 (en) 2009-08-13
WO2009098730A3 WO2009098730A3 (en) 2009-11-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2009/000047 WO2009098730A2 (en) 2008-02-08 2009-02-09 High-strength and high-transparency extendable multilayer film

Country Status (3)

Country Link
DE (1) DE212009000027U1 (en)
IT (1) ITRM20080073A1 (en)
WO (1) WO2009098730A2 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4532189A (en) * 1982-02-19 1985-07-30 W. R. Grace & Co., Cryovac Div. Linear polyethylene shrink films
US5261536A (en) * 1988-10-25 1993-11-16 Mobil Oil Corporation Multi-layer coextruded polyolefin stretch wrap films
FR2795995A1 (en) * 1999-07-08 2001-01-12 Plastiques De La Deome Adhesive film for wrapping palletized load has three layers of low density linear polyethylene each of specified grade and density
US20010055692A1 (en) * 1999-03-17 2001-12-27 Michael T. Heffelfinger Multi-layer film with core layer of syndiotactic polypropylene
EP1258348A1 (en) * 2001-05-18 2002-11-20 Wolff Walsrode AG Polyolefin film with peelable cover layer
EP1332868A1 (en) * 2002-02-04 2003-08-06 Borealis GmbH Multilayer film
US6706343B1 (en) * 1999-06-10 2004-03-16 Pechiney Emballage Flexible Europe Polymeric film structures useful as shrink bags

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2663319B2 (en) * 1992-04-03 1997-10-15 宇部興産株式会社 Stretch wrap multilayer film

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4532189A (en) * 1982-02-19 1985-07-30 W. R. Grace & Co., Cryovac Div. Linear polyethylene shrink films
US5261536A (en) * 1988-10-25 1993-11-16 Mobil Oil Corporation Multi-layer coextruded polyolefin stretch wrap films
US20010055692A1 (en) * 1999-03-17 2001-12-27 Michael T. Heffelfinger Multi-layer film with core layer of syndiotactic polypropylene
US6706343B1 (en) * 1999-06-10 2004-03-16 Pechiney Emballage Flexible Europe Polymeric film structures useful as shrink bags
FR2795995A1 (en) * 1999-07-08 2001-01-12 Plastiques De La Deome Adhesive film for wrapping palletized load has three layers of low density linear polyethylene each of specified grade and density
EP1258348A1 (en) * 2001-05-18 2002-11-20 Wolff Walsrode AG Polyolefin film with peelable cover layer
EP1332868A1 (en) * 2002-02-04 2003-08-06 Borealis GmbH Multilayer film

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199347 Thomson Scientific, London, GB; AN 1993-374189 XP002548754 & JP 05 278179 A (UBE IND LTD) 26 October 1993 (1993-10-26) & JP 05 278179 A (UBE IND LTD) 26 October 1993 (1993-10-26) *

Also Published As

Publication number Publication date
DE212009000027U1 (en) 2010-10-14
WO2009098730A3 (en) 2009-11-26
ITRM20080073A1 (en) 2009-08-09

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