Multi-ply paper product or the like, method for the production thereof and relative system

摘要

A device is provided to produce an embossed multi-ply material, comprising: a first embossing-laminating unit (3) comprising a first embossing cylinder (5) equipped with first projections (5P) defining a first pattern, a first pressure roller (7) cooperating with said first embossing cylinder (5), a first laminating roller (9) and a first glue dispenser (11), disposed between said first pressure roller (7) and said first laminating roller (9); an embossing unit comprising at least a second embossing cylinder (25) provided with second projections (25P) defining a second pattern and a second pressure roller (27) cooperating with said second embossing cylinder (25); a first path (P1) through said first embossing-laminating unit (3); a second path (P2) for at least a second ply (V2) towards and through said second embossing unit (23); a third path (P3) for said third ply (V3).

主权项

1. A multi-ply web material comprising at least three plies joined to one another by adhesive, wherein:
a first ply forming a first outer surface of said web material has a first pattern composed of a plurality of first decorative elements, each of said first decorative elements providing an image in itself and is formed of at least one protuberance projecting inward of said web material and obtained by embossing said first ply, said first decorative elements having a density of no more than 3 elements/cm2; a second ply forming a second outer surface of said web material has a second pattern composed of a plurality of second decorative elements, each of said second decorative elements providing an image in itself and is formed of at least one protuberance projecting inward of said web material and obtained by embossing said second ply, said second decorative elements having a density of no more than 3 elements/cm2; at least a third ply is interposed between said first ply and said second ply; at least a first adhesive is applied between the first ply and the third ply in areas corresponding to at least some of the protuberances defining said first decorative elements of the first ply; the first decorative elements and the second decorative elements are different from each other and are distributed with respect to each other so that the decorative elements of one of the first ply or the second ply are intercalated between the decorative elements of the other of the first ply or the second ply so that the first pattern appears on the first outer surface and not on the second outer surface, and the second pattern appears on the second outer surface and not on the first outer surface; at least a second adhesive, which is chromatically different from the first adhesive, is applied between the second ply and the third ply in areas corresponding to at least some of the protuberances defining said second decorative elements of the second ply; the first ply and the third ply are adhesive-bonded together at least at said areas where said first adhesive is applied, wherein areas in said second ply corresponding to said areas in the first ply are devoid of any protuberance or have a flattened protuberance; and the second ply and the third ply are adhesive-bonded together at least at said areas where said second adhesive is applied.