Abstract: A welding tool for welding plastic films, with a carrier part that has a mechanical interface for coupling to a welding device and with a support surface. At least one recess is formed in the support surface, which recess is fluidically connected to a fluid channel in the carrier part, and with a heating band arrangement which rests on the carrier surface and includes an electrically conductive heating band which is accommodated between an electrically insulating base layer and an electrically insulating cover layer. The base layer is provided with an opening which covers the recess at least in some areas.

Abstract: A welding apparatus includes: a first heating stack, wherein a first heating layer is electrically connected to a first electronic control circuit and is located between a first cover layer and a first electric insulator which is mounted on a first ledge; a second heating stack, wherein a second heating layer is electrically connected to a second electronic control circuit and is located between a second cover layer and a second electric insulator which is mounted on a second ledge, wherein the first heating stack and the second heating stack are coupled to a drive to provide a linear relative movement between the first heating stack and the second heating stack, and wherein the first electronic control circuit is adapted to provide electric energy to the first heating layer and wherein the second electronic control circuit is adapted to detect an electric resistance and/or an electric impedance of the second heating layer.

Abstract: A welding apparatus includes: a first heating stack, wherein a first heating layer is electrically connected to a first electronic control circuit and is located between a first cover layer and a first electric insulator which is mounted on a first ledge; a second heating stack, wherein a second heating layer is electrically connected to a second electronic control circuit and is located between a second cover layer and a second electric insulator which is mounted on a second ledge, wherein the first heating stack and the second heating stack are coupled to a drive to provide a linear relative movement between the first heating stack and the second heating stack, and wherein the first electronic control circuit is adapted to provide electric energy to the first heating layer and wherein the second electronic control circuit is adapted to detect an electric resistance and/or an electric impedance of the second heating layer.

Abstract: Heat-sealing tool for sealing plastic films, having a sealing tape made of an electrically conductive material. A width of the sealing tape is 2 mm to 1000 mm, a length of the sealing tape is 2 mm to 2000 mm and a thickness of the sealing tape is 0.1 mm to 4 mm, and a largest surface of the sealing tape is provided with a plurality of recesses, in which a sum of cross-sectional areas of the recesses in a cross-sectional plane aligned parallel to the largest surface amounts to a maximum of 50 percent of an area of the largest surface.

Abstract: A welding apparatus includes: a first heating stack, wherein a first heating layer is electrically connected to a first electronic control circuit and is located between a first cover layer and a first electric insulator which is mounted on a first ledge; a second heating stack, wherein a second heating layer is electrically connected to a second electronic control circuit and is located between a second cover layer and a second electric insulator which is mounted on a second ledge, wherein the first heating stack and the second heating stack are coupled to a drive to provide a linear relative movement between the first heating stack and the second heating stack, and wherein the first electronic control circuit is adapted to provide electric energy to the first heating layer and wherein the second electronic control circuit is adapted to detect an electric resistance and/or an electric impedance of the second heating layer.