Process for the preparation of paper sheets coupled to films of polymeric material

Abstract From the Canadian patent

Products comprising cellulose paper sheets coupled to films of thermoplastic polymers are prepared by (a) forming a panel comprising at least two superimposed fibrous layers, one layer consisting, at least predominantly of, cellulose fibers and the other consisting at least predominant-, ly, of fibrils or microfibers of synthetic thermoplastic polymers, by successive stratification of pulp or aqueous dispersions of said fibers and fibrils;, (b) reducing the water content of the panel by suction and/or, compression, until it is between 30% and 80% by weight; (c) drying the panel to a moisture content of less than 0.5% by weight; and, (d) heating the panel under pressure at a temperature …