Butt-joining device comprising rolling means

A device (6) for butt-joining a product (2, 2′, 2″) in a strip or in a web of material, comprising:

• a heat-welding and cutting workstation (7) capable of heat-welding and cutting two thicknesses of product (2, 2′, 2″) along a heat-welding and cutting zone (32),
• a laminating workstation (8) with means (9) for laminating by heating the heat-welding and cutting zone (32),
• between which said product (2, 2′, 2″) in a strip or in a web of material is designed to be moved according to a movement defined by means (22) for retaining the product (2, 2″) upstream of the laminating workstation (8) and by a means for pulling the product (2, 2′, 2″) downstream of the laminating workstation (8),
• wherein, in the heat-welding and cutting workstation and in the laminating workstation, the heating is carried out by ultrasound, and in that the device comprises means (16) for adjusting the relative position of the laminating means (9) and of the heat-welding and cutting zone (32) to be laminated, so that, after heat-welding and cutting and after movement of the heat-welding and cutting zone (32) to the laminating workstation (8), the heat-welding and cutting zone (32) to be laminated is placed in correspondence with the laminating means (9).