Method and device for feeding elastic threads in a plant and process for the production of layered composite articles

Device for feeding elastic threads in a plant for the production of layered composite articles, comprising:

• at least one reel holder for at least one elastic thread wound in a reel and at least one motorized unwinding roll associated with the reel holder;
• a pair of opposed transport surfaces configured to receive together and to join at least one web material with said at least one elastic thread unrolled from the reel;
• a control device comprising at least one motorized transport surface;
• wherein the motorized transport surface is operatively arranged between the motorized unwinding roll and the pair of opposed transport surfaces to act on the elastic thread extending between the motorized unwinding roller and the pair of opposed transport surfaces;
• wherein the control device is configured and/or programmed to adjust a linear speed of the motorized transport surface so as to give said at least one elastic thread a first percentage elongation, between the motorized unwinding roller and the control device, less than a second percentage elongation, between the control device and the pair of opposed transport surfaces;
• wherein the device is configured to define a path for the elastic thread extending between the reel holder and the pair of opposed transport surfaces;
• wherein a first section of said path extending between the reel holder and the control device is greater than a second section of said path extending between the control device and the pair of opposed transport surfaces.