Method for producing a paper roll with smooth plies and relative roll

Method for producing a paper roll (111) with smooth plies joined together with glue comprising the steps of

• conveying a first ply (11′) between an upper embossing roll (101), provided with at least first projections defining a decorative motif, and a glue distribution roll (104), or cliché roll;
• maintaining the cliché roll (104) side by side to the upper embossing roll (101), said first ply (11′) being interposed between said upper embossing roll (101) and said cliché roll (104) and, when passing between said two rolls (101, 104), being subjected to incisions (14) and to glue deposits (15) in positions corresponding to said first projections of the embossing roll defining a decorative motif, respectively on one side of the first ply (11′) facing towards the upper embossing roll (101) and on the opposite side of the first ply (11′) facing towards the cliché roll (104);
• conveying a second ply (11″) between the upper embossing roll (101) and a coupling roll (107), or marriage roll;
• maintaining the marriage roll (107) side by side to the upper embossing roll (101) by exerting a coupling pressure in order to perform the final coupling between said first ply (11′) and said second ply (11″) at the glue deposits (15), thus forming a multilayer paper (11).