APPARATUS COMPRISING A HEATED CONTACT SURFACE FOR WELDING THERMOPLASTIC FOILS

摘要

The welding apparatus is a welding press which comprises at least one plastics-welding electrode and at least one back-up electrode, and may also have auxiliary and/or additional devices. The welding electrode and/or the back-up electrode has a pointed or knife-like cutting edge and is arranged or mounted indirectly or directly movably. The pointed cutting edge is combined with a welding profile, which is arranged at an acute angle or bevelled and is preferably arranged set back from the cutting edge. Between the welding press there is arranged a stationary separating band, separating grid, woven or knitted separating fabric, preferably of non-conductive material. The back-up electrode or back-up tool has profilings and the electrode has the cutting edge and/or the welding profile.