Title of Invention

PLASTIC FILM

Abstract

Plastic film (1, 21), especially for packaging three-dimensional objects thai arc Conned preferably during the packaging process, such as soup cubes in particular, with a base film (2, 22) made from a polyolclln or polyethylene tercphthalatc that is preferably metallised on one side, where an oriented polypropylene film, preferably a biaxial ly oriented polypropylene film or a PET film, is provided as the base film (2, 22), on the side of which with the metallisation (3) printing (5) is provided, while a preferably ribbon-shaped pattern coating of cold seal adhesive (6) is applied to the side of the base film (2, 22) facing away from the metallisation (3). Fig. 1 To, The controller of Patents The Patent Office, Mumbai.

Full Text

FORM 2 THE PATENTS ACT, 1970 (39 of 1970) COMPLETE SPECIFICATION (See Section 10, rule 13) PLASTIC FILM HUHTAMAKI RONSBERG ZWEIGNIEDERLASSUNG DER HUHTAMAKI DEUTSCHLAND GMBH & CO KG of HEINRICH NICOLAUS- STR. 6, D-87671 RONSBERG, GERMANY, GERMAN National Company The following specification particularly describes the nature of the invention and the manner in which it is to be performed .- - GRANTED 28-3-2005 The invention relates to a plastic film, especially for packaging three-dimensional objects that are fonned preferably during the packaging process, such as soup cubes in particular, with a base film made from a polyolefin that is metallised on one side. DE-A-100 21 687 discloses such a film, that is provided on at least one side with an adhesive or sealing layer. On the basis of this, the aim of the invention is to design a plastic film of the kind outlined above in such a way that it can be produced efficiently and provides the object that is to be packaged with optimum protection. In the solution to this problem proposed by the invention, an oriented polypropylene film, preferably a biaxially oriented polypropylene film or a PET film, is provided as the base film, on the side of which with the metallisation printing is provided, while a preferably ribbon-shaped pattern coating of cold seal adhesive is applied to die side of the base film facing away from the metallisation. Only the amount of the cold seal adhesive provided to close a pack produced from a section of the plastic film that is needed to achieve a sufficiently tight closure is applied. In accordance with an advantageous further development of the invention, the printing is covered to some extent by a pattern coating of release lacquer, with the areas to which the lacquer is applied coinciding with those to which the cold seal adhesive is applied. This is an effective way to prevent layers of the plastic film located on top of each other sticking together when the film is wound to form a reel. It has proved to be very advantageous in another further development of the invention if a primer and / or tie layer is provided between the metallisation and the printing. A durable bond between the printing and the metallisation is achieved as a result. In another advantageous further development of (lie invention a compact film is provided as the base film. A film with cavities in it can, however, be provided as the base film in accordance with the invention too. Light refraction occurs on the edges surrounding the cavities and makes the film opaque. Jn accordance with the invention, the cavities can lake the form of vacuoles that are produced when the film is oriented. Another possible way to create the cavities is to produce them by foaming the film. It has proved to be very advantageous if in accordance with the invention the compact base film has a thickness of about 10 to 100 μ, preferably 20 to 50 μ and in particular 28 to 32 μ. In accordance with another advantageous further development of the invention, the base film with cavities in it has a thickness of about 10 to 100 μ, preferably 20 to 50 μ and in particular 35 to 42 μ. Two embodiments of the invention are illustrated in the drawings: Fig. 1 is adiagram of the structure of a plastic film with a compact base form that is metallised on one side and Fig. 2 is a diagram of another plastic film with a base film that has 1 in Fig. 1 is a plastic film that has a base film 2 made from oriented perfect (OPP) 30 μ. thick. This base film 2 is provided with metallisation 3 on one side which printing 5 has been applied via a primer and / or tie layer 4. The provided with a pattern coating of cold set' adhesive 6 on its side laein the printing and / or metallisation. The printing 5 is piovidcd on the release layer 7 that is located in accordance with the cold seal adhensive the plastic film is wound into a reel, the cold sea! adhesive and the located on top of each other and thus prevent the cold seal adhesive 6 from sticking lo the adjacent side of the plastic film. The base film can consist of PET instead of OPP. An appropriate structure for a plastic film 21 is shown in the embodiment illustrated in Fig, 2. The base film 22 consists, however, of an opaque, oriented polypropylene film (OPP), the opacity of which is produced by vacuoles created during orientation. This base film is 38 u. thick and is again provided on one side with metallisation 3, to which a primer and / or tic layer 4 is applied. This primer layer enables the subsequently applied printing 5 to bond securely. The side of the base film 22 facing away from the metallisation has a pattern coating of cold seal adhesive 6, application of which is provided in accordance with a release layer 7 applied to the printing 5, which prevents the cold seal adhesive from sticking when the plastic film is wound into a reel. In order to improve the windability of the plastic film, the areas next to the release layer and / or the cold seal adhesive can be filled up with coatings too. The base film can have been given its opacity by foaming too, with light refraction also occurring on the bubbles produced inside. We Claim:- 1. Plastic film (1, 21), especially for packaging three-dimensional objects that arc formed preferably during the packaging process, such as soup cubes in particular, with a base film (2, 22) made from a polyolcfin or polyethylene tcrcphthalate thai is preferably metallised on one side, wherein an oriented polypropylene film, preferably a biaxially oriented polypropylene film or a PET film, is provided as the base film (2, 22), on the side of which with the metallisation (3) printing (5) is provided, while a preferably ribbon-shaped pattern coating of cold seal adhesive (6) is applied to the side of the base film (2, 22) facing away from the metallisation (3). 2. Plastic film according to claim 1, wherein the printing (5) is covered to some extent by a pattern coating of release lacquer (7), with the areas to which the lacquer is applied coinciding with those to which the cold seal adhesive (6) is applied. 3. Plastic film according to claim 1 or 2, wherein a primer and / or tic layer (4) is provided between the metallisation (3) and the printing (5). 4. Plastic film according to claim 1, 2 or 3, wherein a compact film is provided as the base film (2). 5. Plastic film according to claim 1, 2 or 3, wherein a film with cavities in it is provided as the base film (22). 6. Plastic film according to claim 5, wherein the cavities take the form of vacuoles that are produced when the film is oriented. 7. Plastic film according to claim 5, wherein the cavities arc produced by foaming. 8. Plastic film according to claim 4, wherein the compact base film (2) has a thickness of about 10 to 100 μ, preferably 20 to 50μ, and in particular 28 to 32 μ. 9. Plastic film according to claim 5, wherein the base film (22) with cavities in it has a thickness of about 10 to 100 μ, preferably 20 to 50 Μ and in particular 35 to 42 Μ. Dated this 15th day of Apri1. 2003 HIRAL CHANDRAKANT JOSH AGENT FOR HUHTAMAKI RONSBERG ZWEIGNIEDERLASGUNG DER HUHTAMAK I DEUTSCHLAND GMBH & CO KG

Documents:

371-mum-2003-abstract(28-03-2005).doc

371-mum-2003-abstract(28-03-2005).pdf

371-mum-2003-cancelled pages(28-03-2005).pdf

371-mum-2003-claims(granted)-(28-03-2005).doc

371-mum-2003-claims(granted)-(28-03-2005).pdf

371-mum-2003-correspondence(28-03-2005).pdf

371-mum-2003-correspondence(ipo)-(07-02-2007).pdf

371-mum-2003-drawing(28-03-2005).pdf

371-mum-2003-form 1(28-03-2005).pdf

371-mum-2003-form 19(11-02-2004).pdf

371-mum-2003-form 2(granted)-(28-03-2005).doc

371-mum-2003-form 2(granted)-(28-03-2005).pdf

371-mum-2003-form 3(13-01-2004).pdf

371-mum-2003-form 3(16-04-2003).pdf

371-mum-2003-form 5(15-04-2003).pdf

371-mum-2003-power of attorney(28-03-2005).pdf

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