Machine for the waterproof treatment of a blank for making a container for foodstuffs transport and process for waterproofing said blank

摘要

The present invention refers to a machine (20) and to a process for waterproofing a blank (10) for making a container for foodstuffs transport, in which the blank (10) comprises at least one plane inner sheet (11) made of paper material adapted to come into contact with foodstuffs, comprising a first coating waterproof layer (14) made with a hot glue; at least one plane outer sheet (12) made of paper material opposite to the inner sheet; and, at least one corrugated sheet (13) made of paper material interposed between the inner sheet (11) and the outer sheet (12). The waterproofing of the blank (10) is performed by means of two spreading rollers (22) which apply the hot glue simultaneously on the plane inner sheet (11) and on the plane outer sheet (12) of the blank.