Jaw to the thermal welding or for cool down of materials in general, and in particular of thermoplastic materials, which also gleichfoermige or not, however, irregular maes strength have wall thicknesses can

摘要

1,246,653. Seaming non-metallic sheet material. CENTRA ANSTALT. 29 Nov., 1968 [11 July, 1968], No. 56716/68. Heading B5K. The material-contacting surface 5SP1/SP of a jaw for welding portions or cooling previouslywelded portions of thermoplastic materials comprises a plurality of elastic metallic laminar plates 5 which are deformable so as to follow all the profile irregularities of the portions. The jaw comprises a metallic block 1 holding the plates 5 mounted parallel to each other and, preferably, made of beryllium-bronze. The plates 5 may be C-shaped, Fig. 1, or annular, Fig. 6a, each with a projecting lower end 5SP1/SP or T-shape, Fig. 3 (not shown), with the upper portion resting against a silicon rubber buffer (8). If the jaw is used for welding, an electric heating resistance is located in a bore 12 and a thermocouple feeler in a bore 13. If the jaw is used for cooling, liquid is circulated through the bore 12. In use, the jaw co-operates with a similar jaw or a plane surface. A "non-stick" sheet of polytetrafluoroethylene or carbon fluoride may be placed between each of the jaws and the material when welding. The thermoplastic material to be welded may be gusseted tubing.