Stock material or miscellaneous articles – Layer or component removable to expose adhesive – Protective layer
Patent
1996-08-19
1999-03-02
Chen, Vivian
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
Protective layer
428 418, 428202, 428480, 428483, 428511, 428512, 428513, 428514, 428515, 428516, 428520, 428522, 428523, 428216, 428339, 428340, 156230, 156235, 156247, 156289, 1563073, 1563074, 1563077, B32B 706, B32B 2708, B32B 2710, B32B 2736
Patent
active
058768181
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/AT95/00190, filed Oct. 4, 1995.
BACKGROUND OF THE INVENTION
The invention relates to a plastic-paper composite in foil form as well as its use for producing weatherproof laminated sheets with surface protection.
DESCRIPTION OF RELATED ART
Laminated sheets are produced by compressing a stack comprised of a quantity of resin-covered paper strips. A decorated paper strip impregnated with melamine resin is placed on one of the two surfaces of a stack that is made up, for example, of several papers impregnated with phenol resin, and is then compressed with it. As a result of this measure, the laminated sheet is provided with a very hard, scratch-proof, strong decorated surface.
These decorated laminated sheets are used indoors for manufacturing furniture, but can be used outdoors as well. In outdoor use, however, it has been found that the decorated laminated sheets tend to get scratched off, whereby the visual appearance of the cover is considerably impaired.
It has long been an object, therefore, to produce decorative laminated sheets for outdoor use that are weatherproof. Thus, weather protection can be provided in the form of a lacquer layer or a foil. Preferred materials are those based on acrylic resins which make durable weatherproofing possible. By using acrylic resin lacquer for producing the weatherproof outer sheets, according to EP-A-281586, one or both outer layers of the stacks consisting of the paper layers impregnated with plastic resin are covered with an acrylic lacquer and then compressed in a press at an increasing pressure and temperature. The acrylic resin lacquer, however, has the disadvantage that steel plates, matrices, or separating papers can adhere to the compression equipment, which leads to the formation of decorative surfaces with unattractive visual qualities.
When using foils with an acrylate base, for example, it has been demonstrated that they are difficult to handle during the compression operation, since they rip easily, wrinkle, and roll up. This often leads to the necessity of using manual assistance, which is costly, and can lead to faulty production processes as well.
It is also known that plastic foils can be used as carrier material for weatherproof lacquers, especially acrylic resin lacquer, which are applied on one or both sides of the stack consisting of paper layers impregnated with synthetic resin, and can be compressed together with them. After the compression operation, the carrier material is peeled off from the acrylic resin sheet, which now forms the weatherproof outer surface of the laminated sheet. Since this arrangement consisting of the carrier material and the acrylic resin sheet is very thin, it is difficult to handle and easily slips off the pressing stack. Additional pattern producers, such as pressing plates or matrices, are needed in order to obtain a decorated surface for the weatherproof laminated sheet. The surface hardness of acrylic resin sheets is also less than that of melamine surfaces, so that during transportation between processes during production, and also when handled by the user, especially during the cutting and mounting of plates of up to 70 Kg, the acrylic resin sheet can be damaged.
The object of the invention is then to provide a plastic-paper combination foil of the type described above that can be used as carrier material for the acrylic sheet provided with weatherproof protection that does not exhibit the known disadvantages, and which serves as a shaper--independent from its function as carrier material--during the pressing operation, and, at the same time, which builds a removable surface protection provided with a weatherproof protection, for example, for transportation.
SUMMARY OF THE INVENTION
According to the invention, a plastic-paper composite is proposed, which is in foil form and is made up of a paper layer, a polypropylene layer, and a polyester layer, and wherein the polyester layer forms one of the two surface layers of the plastic-paper composite.
The plastic-paper compos
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Horvath Michael
Petershofer Georg
Chen Vivian
Isovolta Osterreichische Isolierstoffwerke Aktiengesellschaft
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