Method and device for heating an embossing roller in an embossing-laminating device

An embossing device comprising:

• a first path, for a first ply of web material;
• along the first path, a first pressure roller, coacting with a first embossing roller, the first embossing roller and the first pressure roller defining a first embossing nip for the first ply of web material, the first embossing roller comprising embossing protrusions;
• a second path, for a second ply of web material, along the second path, a second pressure roller, coacting with a second embossing roller, the second embossing roller and the second pressure roller defining a second embossing nip for the second ply of web material,
• at least one coupling device of said first ply and said second ply, coacting with said first embossing roller or said second embossing roller, said coupling device and said first embossing roller or said second embossing roller defining a lamination nip, said coupling device being a roller or a series of coaxial rollers,
• at least a first electromagnetic induction device externally associated with said first embossing roller to heat a surface of said first embossing roller;
• wherein said first electromagnetic induction device is connected to a first generator device to supply said first electromagnetic induction device with electromagnetic induction currents adapted to generate an electromagnetic flux directed toward said first embossing roller and wherein an operating frequency of said electromagnetic induction currents generates eddy currents on said first embossing roller such as to prevalently follow a profile of an outer surface of said first embossing roller;
• and wherein the embossing device comprises said first electromagnetic induction device and a movement device for moving the electromagnetic induction device from an operating area close to and alongside said first embossing roller to a non-operating area at a distance from said first embossing roller.