EP1557285A1 - Verpackung mit einer abreibbaren Fläche - Google Patents

Verpackung mit einer abreibbaren Fläche Download PDF

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Publication number
EP1557285A1
EP1557285A1 EP04447018A EP04447018A EP1557285A1 EP 1557285 A1 EP1557285 A1 EP 1557285A1 EP 04447018 A EP04447018 A EP 04447018A EP 04447018 A EP04447018 A EP 04447018A EP 1557285 A1 EP1557285 A1 EP 1557285A1
Authority
EP
European Patent Office
Prior art keywords
layer
rub
multilayer
adhesion
promotion layer
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.)
Withdrawn
Application number
EP04447018A
Other languages
English (en)
French (fr)
Inventor
Eddy Daelmans
Guy Grossard
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.)
Amcor Flexibles ApS
Original Assignee
Amcor Flexibles Europe AS
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 Amcor Flexibles Europe AS filed Critical Amcor Flexibles Europe AS
Priority to EP04447018A priority Critical patent/EP1557285A1/de
Priority to PCT/BE2004/000129 priority patent/WO2005070695A1/en
Publication of EP1557285A1 publication Critical patent/EP1557285A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D15/00—Printed matter of special format or style not otherwise provided for
    • B42D15/02—Postcards; Greeting, menu, business or like cards; Letter cards or letter-sheets
    • B42D15/025—Postcards; Greeting, menu, business or like cards; Letter cards or letter-sheets with peel-away layer hiding information
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63F—CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
    • A63F9/00—Games not otherwise provided for
    • A63F9/001—Games or toys connected to, or combined with, other objects; Objects with a second use as a toy or game
    • A63F2009/0012—Games or toys connected to, or combined with, other objects; Objects with a second use as a toy or game the other object being a container or part thereof
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63F—CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
    • A63F3/00—Board games; Raffle games
    • A63F3/06—Lottos or bingo games; Systems, apparatus or devices for checking such games
    • A63F3/065—Tickets or accessories for use therewith
    • A63F3/0665—Tickets or accessories for use therewith having a message becoming legible after rubbing-off a coating or removing an adhesive layer

Definitions

  • the present invention relates to packaging films, and in particular to flexible packaging films comprising a rub-off area including hidden promotional, commercial or gaming messages.
  • Hidden promotional and gaming messages are well introduced in today's world of packaging. Hiding the message in such a way that the consumer can only see the message after having bought the product is generally achieved by inside or reverse printing using very opaque films or covering inks. This is in some cases a limiting factor for flexible packaging.
  • Document GB 2185215 A discloses a rub-off ticket with hidden information sandwiched in between a substrate layer and an opaque covering layer able to become transparent by an adequate treatment to enable the viewing of a hidden message through the covering layer when a mask material is removed.
  • an all-over clear varnish underneath a covering mask covers the hidden information.
  • the tickets are furthermore embossed to avoid a relief detection of the hidden information, which stands proud of the surface of the substrate.
  • the coatings (opaque masks) described in the above-mentioned documents typically deal with a thickness of 40 to 80 ⁇ . This high thickness leads to a high cost-price and are not usable for packaging films with a thickness between 20 and 40 ⁇ , because in that case, the rub-off coating is proportionally as big as, or even bigger than, the packaging film.
  • reels of about 1.000 meters are sold to the packaging converters. Those reels have a succession of a few thousand layers. If the packaging web comprises a rub-off layer, on a specific location, with a thickness between 40 and 80 ⁇ deposited on a film substrate of about 30 ⁇ , this would create an enormous "ghosting effect" because of the accumulation of this specific thickness on a specific location of the reel. This can lead to loose ends, telescoping, increased thickness of bands in machine direction etc.
  • coatings (opaque masks) described in the above-mentioned documents are not suitable for indirect or direct food contact which is a major issue for food packaging.
  • a specific problem to be solved is therefore to create a rub-off layer on a flexible substrate representing substantially not more than 20%, and if possible not more than 10%, of the global thickness of the multilayer substrate to avoid the "ghosting effect". Furthermore, the thickness of the hidden message should not represent more than 5% of the total thickness of the whole structure in order to avoid the creation of any relief effect revealing the hidden message.
  • the present invention aims to provide a packaging comprising a rub-off area with a rub-off coating layer suitable for direct and indirect food contact and a hidden patterned message of a low thickness with no relief effect.
  • the present invention discloses a multilayer comprising a substrate layer, a rub-off layer and a patterned adhesion promotion layer or a patterned release promotion layer characterised in that said patterned adhesion or release promotion layer regulates the adhesion between the rub-off layer and the substrate layer in order to reveal a hidden message after the part of the patterned rub-off layer with the lowest adhesion has been rubbed off.
  • the material for the substrate layer is selected from the group consisting of plastic, paper, cellophane, non-woven, metals and combinations thereof in a multilayer structure.
  • the plastic materials of the multilayer comprises mono and multilayer films of polyolefins, polyesters, polyamides, polystyrenes, PVC's, copolymers of the preceding polymers, or combinations thereof.
  • the adhesion promotion layer is selected from the group consisting of urethanes, EVA's, PVB's, EBA's, water-based acrylic polymers, styrene acrylic polymer, EAA copolymer, polyurethane, epoxy, polyethyleneimine, polyester, silane and its derivatives, and vinyl amine.
  • the adhesion promotion layer further comprises a crosslinker selected from the group of isocyanates and aziridines.
  • the release promotion layer is selected from the group consisting of polymers and/or waxes of the following families: polyethylene, amides, silicone, acryl, fluorocarbons, melamine, ionizing radiation-curable type polyfunctional acrylates, polyester, epoxy, catalyst-, light-and heat-curable amino modified silicone oils, polydimethyl silicone rubber, phenyl-modified silicone rubber, epoxy-modified silicone rubber, and urethane-modified silicone rubber, acrylate-acrylonitrile copolymer, acrylic acid-alkyl acrylate copolymer, polyvinyl chloride resin, polyvinyl N-octadecyl carbamate, polyethylene based wax, polyamide based wax, polysiloxane, polyvinyl ester, polyethylene imine, alkyl substituted amine, chromium complex, fatty acids, and mixtures thereof.
  • polymers and/or waxes of the following families polyethylene, amides, silicone, acryl, fluorocarbons
  • the rub-off layer (4) is selected from the group consisting of natural or synthetic rubber latex dispersions comprising polychloroprene, polyurethane, styrene-isoprene copolymers, styrene-butadiene copolymer, polyimide; polyvinyl chloride; nitrocellulose, polyisoprene, acrylonitrile-butadiene-isoprene terpolymer, butadiene/methacrylonitrile, polyethylene vinyl acetate, polyacrylates, ethyl acrylate/vinyl acetate/methacrylic acid terpolymers and mixtures thereof.
  • natural or synthetic rubber latex dispersions comprising polychloroprene, polyurethane, styrene-isoprene copolymers, styrene-butadiene copolymer, polyimide; polyvinyl chloride; nitrocellulose, polyisoprene, acrylon
  • the rub-off layer is coloured to enhance the promotional message.
  • the rub-off layer is suitable for direct and indirect food contact.
  • the patterned adhesion promotion layer keeps an optical contrast after the rub-off layer has been taken away.
  • said rub-off layer comprises colour pigments that are able to migrate into the adhesion promotion layer or into the release promotion layer.
  • the rub-off layer represents less than 20% of the total thickness of the multilayer.
  • the adhesion promotion layer or the release promotion layer represents less than 5% of the total thickness of the multilayer.
  • the invention discloses a packaging comprising a film of Claim 1.
  • the invention discloses a method for the production of the multilayer of Claim 1 comprising the following steps:
  • the invention discloses the use of the multilayer of Claim 1 for packaging applications, lottery ticketing and envelopes comprising promotional and/or gaming messages.
  • Fig. 1 shows a multilayer comprising a substrate layer, a patterned adhesion promotion layer and a rub-off layer as a covering.
  • the patterned adhesion promotion layer represents the hidden message.
  • Fig. 2 shows the same multilayer as in Fig. 1 after the rub-off layer has been rubbed off in the areas where no patterned adhesion promotion layer was applied. Almost the entire rub-off layer remains visible where the adhesion promotion layer was applied and reveals thereby the hidden message.
  • Fig. 3 shows the same multilayer as in Fig. 1 and 2 after the rub-off layer has almost totally been rubbed off with only a very thin coating of rub-off layer remaining on the adhesion promotion layer, thus creating a differential optical reflection compared to the areas where no adhesion promotion layer was applied and still leaving a clearly visible promotional message.
  • Fig. 4 shows the particular case of the invention where the colour pigment of the rub-off layer has migrated into the patterned adhesion promotion layer.
  • Fig. 5 shows a multilayer substrate comprising a substrate layer, a patterned release promotion layer and a rub-off layer.
  • Fig. 6 shows the same multilayer substrate as in Fig. 4 after the rub-off layer has been rubbed off and where the rub-off layer only disappeared on the patterned surfaces where the patterned release promotion layer was applied.
  • Fig. 7 shows a top view of a multilayer substrate of the present invention.
  • Fig.8a and 8b show a particular multilayer substrate of the present invention with an aluminium vacuum coated BOPP film.
  • the hidden messages can be positioned on the recto side or/ and the verso side.
  • Fig 8a shows the recto version of a BOPP film printed with a patterned adhesion promotion layer (hidden message).
  • Fig 8b shows the verso version of a metallized BOPP film printed all over with an adhesion promotion layer.
  • the present invention is based on a differential adhesion effect between an opaque rub-off layer 4 and a substrate layer 1.
  • This differential adhesion is achieved by an adhesion promotion layer 2 (primer) or by a release promotion layer 3 printed on a substrate.
  • the "hidden message” should be understood as an information of any kind and can be a positive or a negative text, logo, number, ...; this can be achieved by alternatively playing with an adhesion promotion layer and/or a release promotion layer to favour the adhesion of some patterned surfaces or to favour the release of other patterned surfaces.
  • rub-off layer compositions comprising particular colour pigments are suitable to favour the migration of those colour pigments into the adhesion promotion layer 2 or the release promotion layer 3. This always creates an optical contrast, even if the rub-off layer is entirely rubbed off, as shown in Fig. 3.
  • an adhesion promotion layer 2 is printed in pattern and contains a hidden message in form of a positive or negative text.
  • the adhesion between the adhesion promotion layer 2 and the substrate layer 1 on one hand and the rub-off layer 4 on the other hand is better than the adhesion between the rub-off coating layer 4 and the substrate 1.
  • a release promotion layer 3 is printed in pattern on a substrate layer 1 and the printed pattern contains a positive or negative picture of a hidden message.
  • the adhesion between the substrate layer and the rub-off layer is better than the adhesion between the rub-off layer and the release promotion layer 3. This allows to rub away the rub-off layer 4 on the areas where the release promotion layer 3 is applied, revealing a promotional message.
  • the rub-off layer 4 is coloured with a particular pigment that is able to migrate into the adhesion promotion layer 2 or into the release promotion layer 3. This embodiment is represented in Fig. 4 and allows to rub off the total thickness of the rub-off layer 4 without losing the message which still appears on the adhesion promotion layer 2 or on the release promotion layer 3.
  • Non-restrictive examples of substrate layers are mono or multilayer plastic films or bottles, glass, paper, cellophane, non-woven, metallic layers or combinations thereof.
  • plastic film all different flexible packaging films well-known by those skilled in the art can be used, non-restrictive examples are extruded and/or laminated polyolefins, polyesters, polyamide, polystyrene, PVC or their copolymers or combinations thereof.
  • Non-restrictive examples of the adhesion promotion layer 2 are EVA-, PVB- or EBA-based polymer coatings, acrylics, styrene acrylics, ethylene-acrylic acid copolymer, polyurethane, epoxy, polyethyleneimine, polyester, silane and its derivatives, and vinyl amine.
  • the adhesion promotion layer may comprise a crosslinker like isocyanate or aziridine.
  • Non-restrictive examples of the release promotion layer 3 are generally waxes.
  • release agents usable as the release promotion layer include waxes such as polyethylene wax, amide wax, Teflon® powder, silicone wax, carnauba wax, acryl wax, and paraffin wax, fluorocarbon resins, melamine resins, polyolefin resins, ionizing radiation-curable type polyfunctional acrylate resins, polyester resins, epoxy resins, catalyst-, light-and heat-curable silicone oils modified with amino, epoxy, OH, and COOH, silicone resins such as polydimethyl silicone rubber, phenyl-modified silicone rubber, epoxy-modified silicone rubber, and urethane-modified silicone rubber.
  • ethyl acrylate-acrylonitrile copolymer acrylic acid-alkyl acrylate copolymer
  • polyvinyl chloride resin polyvinyl N-octadecyl carbamate
  • polyethylene based wax polyamide based wax
  • polysiloxane fluorocarbon polymer
  • polyvinyl ester polyethylene imine, alkyl substituted amine, chromium complex, fatty acid based wax, and mixtures thereof.
  • the rub-off layer 4 generally are latex dispersions of synthetic or natural rubber.
  • Non-restrictive examples of such dispersions are polymeric materials such as natural latex, polychloroprene; polyurethane (including aqueous polyurethanes), styrene-isoprene copolymers (including terpolymers, tetrapolymers, etc.), styrene-butadiene copolymer, polyimide; polyvinyl chloride, nitrocellulose, polyisoprene, acrylonitrile-butadiene-isoprene terpolymer, butadiene/methacrylonitrile, polyethylene vinyl acetate, polyacrylates, including a carboxyl modified acrylic emulsion, ethyl acrylate/vinyl acetate/methacrylic acid terpolymers and mixtures thereof.
  • the position of the rub-off areas within the packaging wrap can be chosen according to marketing criteria's and can be placed inside longitudinal or cross-seal as well as inside or outside the packaging. Since the messages are automatically hidden by the nature of the system, they can be positioned both on the recto and the verso side of the wrap, as well as in the seal area.
  • the consumer can only rub off the rub-off layer 4 after opening the seal. Since the adhesion promotion layer 2 or the release promotion layer 3 are situated in the seal area, special care is required. In the case of a cold seal area, the adhesion/release promotion layer (2,3) and the rub-off layer 4 can be positioned in a cold-seal free area. In the case of a heat-seal version, the adhesion/release promotion layer (2,3) and the rub-off layer 4 can be positioned in a heat-seal free area.
  • the heat-seal jaws have been designed in such a way that the adhesion/release promotion layer (2,3) and the rub-off layer 4 are not heat-sealed.
  • the rub-off layer can also be automatically removed when the seal is peeled open. This is possible because the rub-off layer 4, which covers the message within the adhesion/release promotion layer (2,3) on one side of the seal, is removed towards and onto the rub-off layer 4 on the other side of the seal. This is possible because of the differential adhesion properties of the rub-off layer versus the substrate in the presence of said adhesion/release promotion layer (2,3).
  • the rub-off layer 4 with the hidden promotional message When the rub-off layer 4 with the hidden promotional message is inside the packaging and in contact with the product, in the case of a food product, the rub-off layer needs to enjoy food-contact status. Moreover, since the message is "written" on the inside of the packaging, the printed substrate needs to be sufficiently opaque in order to avoid that the message can be read from the outside. This is given by the extremely low thickness of the adhesion/release promotion layer (2,3) which is substantially lower than that of the printing used on ticketing of the prior art and is generally lower than 1 ⁇ .
  • rub-off layers related to the invention are typically, but not limited to latex based dispersion coatings with reduced stickiness. Generally they can be considered as a cold sealing adhesive that is sensitive to contact and pressure. They can stick in a "permanent" way to the surface of many materials by means of mere contact and pressure.
  • Different types of cold-seal can be classified e.g. in a range from dry (limited stickiness) to soft (increased stickiness).
  • adhesion between cold-seal and the other side of the flexible packaging material can be avoided by the right choice of material on the other side, for instance the homopolymer side of a co-extruded biaxially-oriented polypropylene film NND of Trespaphan®, MB 200 from Mobil Films, by a coating, or by the choice of cold-seal (dry cold-seal).
  • the choice of substrate material is only restricted by practical machinability considerations such as thickness and stiffness (e.g. substrates between 15 and 150 ⁇ ) consisting of polypropylene, polyester, polyethylene, polyamide multilayers as well as different types of paper, non-wovens, aluminium foil and in general, any known structure in the field of packaging can be used.
  • thickness and stiffness e.g. substrates between 15 and 150 ⁇
  • substrates between 15 and 150 ⁇ consisting of polypropylene, polyester, polyethylene, polyamide multilayers as well as different types of paper, non-wovens, aluminium foil and in general, any known structure in the field of packaging can be used.
  • Fig 8a shows the recto version (layers not to scale)
  • the metallized side 12 of the BOPP film 1 is printed with a patterned adhesion promotion layer (hidden message) 2.
  • the design (ink) 9 is printed onto an adhesion promotion layer 13, which in some cases can be the same coating as the patterned adhesion promotion layer 2.
  • a protective or a release lacquer 10 is printed all over except on the hidden message and the surrounding part to protect the inks and to avoid blocking between the inks on the recto side and the cold-seal (if any) on the verso side.
  • the patterned adhesion promotion layer (hidden message) 2 and the surrounding part are covered with the rub-off layer 4. If the pack is to be closed by a cold-seal, a cold-seal coating 7 will be printed in pattern on the verso side of the substrate.
  • the design (inks) 9 is printed onto an adhesion promotion layer 13.
  • a protective or a release lacquer 10 is printed all over to protect the inks and to avoid blocking between the inks on the recto side and the cold-seal (if any) on the verso side.
  • the patterned adhesion promotion layer (hidden message) 2 is printed on the verso side covered with a rub-off coating 4. If the pack is to be closed by a cold-seal, a cold-seal coating 7 will be printed in pattern on the verso side of the substrate.

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  • Wrappers (AREA)
  • Laminated Bodies (AREA)
EP04447018A 2004-01-26 2004-01-26 Verpackung mit einer abreibbaren Fläche Withdrawn EP1557285A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04447018A EP1557285A1 (de) 2004-01-26 2004-01-26 Verpackung mit einer abreibbaren Fläche
PCT/BE2004/000129 WO2005070695A1 (en) 2004-01-26 2004-09-14 Packaging comprising a rub-off area

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04447018A EP1557285A1 (de) 2004-01-26 2004-01-26 Verpackung mit einer abreibbaren Fläche

Publications (1)

Publication Number Publication Date
EP1557285A1 true EP1557285A1 (de) 2005-07-27

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EP04447018A Withdrawn EP1557285A1 (de) 2004-01-26 2004-01-26 Verpackung mit einer abreibbaren Fläche

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EP (1) EP1557285A1 (de)
WO (1) WO2005070695A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1884369A1 (de) 2006-08-04 2008-02-06 ATEM SERVIZI INTEGRATI S.p.A. Verfahren um bedruckte Gegenstände zu herstellen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2915425B1 (fr) * 2007-04-24 2011-04-08 Serge Laskar Systeme de reperage de classement securise sur grilles par retrait d'une couche opaque de produits de grattage.
CN110128903B (zh) * 2019-04-04 2021-08-20 武汉华中科大新材料股份有限公司 一种用于深色镭射电化铝的无苯成像层及其制备方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299637A (en) * 1978-06-14 1981-11-10 John R. Koza Method of making a game ticket
GB2185215A (en) * 1986-01-10 1987-07-15 Norton & Wright Limited Tickets with rub-off surfaces to reveal information
US4724166A (en) * 1984-03-09 1988-02-09 Grand Rapids Label Company Label assemblies and method of making same
US4846504A (en) * 1988-08-30 1989-07-11 Avery International Corporation Secure on-pack promotional coupons
WO1998058797A1 (en) * 1997-06-24 1998-12-30 Dittler Brothers Incorporated Image sublimation
WO2000009344A1 (en) * 1998-08-11 2000-02-24 Dittler Brothers, Inc. Laser image engraving in scratch-off coating applications
WO2000031713A2 (en) * 1998-11-24 2000-06-02 The Coca Cola Company Label with revealable concealed game message on back side, packaged beverage with said label and a method for making same
WO2003066344A1 (en) * 2002-02-05 2003-08-14 Optaglio Limited Secure data protection optically variable labels and foils

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1176575A1 (de) * 1997-03-17 2002-01-30 Magiccom Biegsames Etikett, biegsame Rolle und biegsamer Stapel
ES2221028T5 (es) * 1997-07-17 2010-04-09 ALCAN TECHNOLOGY & MANAGEMENT AG Material para envases y tapas.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299637A (en) * 1978-06-14 1981-11-10 John R. Koza Method of making a game ticket
US4724166A (en) * 1984-03-09 1988-02-09 Grand Rapids Label Company Label assemblies and method of making same
GB2185215A (en) * 1986-01-10 1987-07-15 Norton & Wright Limited Tickets with rub-off surfaces to reveal information
US4846504A (en) * 1988-08-30 1989-07-11 Avery International Corporation Secure on-pack promotional coupons
WO1998058797A1 (en) * 1997-06-24 1998-12-30 Dittler Brothers Incorporated Image sublimation
WO2000009344A1 (en) * 1998-08-11 2000-02-24 Dittler Brothers, Inc. Laser image engraving in scratch-off coating applications
WO2000031713A2 (en) * 1998-11-24 2000-06-02 The Coca Cola Company Label with revealable concealed game message on back side, packaged beverage with said label and a method for making same
WO2003066344A1 (en) * 2002-02-05 2003-08-14 Optaglio Limited Secure data protection optically variable labels and foils

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1884369A1 (de) 2006-08-04 2008-02-06 ATEM SERVIZI INTEGRATI S.p.A. Verfahren um bedruckte Gegenstände zu herstellen

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