Patent ID: 6703140
Filing Date: 2004-03-09
Classification: B32B,E04C,Y10T

Abstract:
A sandwich board comprising:(c) successive layers, said successive layers comprising: (v) a core comprised of packages of absorbent cellulose sheets impregnated with phenolic rsin, (vi) a cellulose film impregnated with melamine outside said core; (vii) a wood panel treated with phenolic resin outside said cellulose film; (viii) a tone package of one to three translucent and/or transparent films of cellulose each of which is impregnated with a resin selected from the group consisting of melamine, melamine-acrylic, phenolic and melamine-phenolic; and (d) a protective multi-layer transparent/translucent film placed outside said successive layers of said sandwich board to provide greater protection to said successive layers from environmental conditions, said protective multi-layer film comprising: (iii) an outer acrylic film which faces away from said successive layers of said sandwich board; (ii) an inner absorbent cellulose film affixed to an outer layer of said successive layers of said sandwich board, said inner absorbent cellulose film impregnated with a resin which is compatible with a resin used to impregnate the outer layer of said successive layers of said sandwich board; and (iv) an adhesive layer which adheres said outer acrylic film to said inner absorbent cellulose film of said multi-layer film.