Apparatus and process for welding hollow parts

摘要

The machine includes in addition a mirror at a temperature not melting plastic contacted by it (a cold mirror). An Independent claim is included for the method of welding. At the start of the cycle, edges of objects (21, 22) to be welded, are positioned facing each other. The cold mirror (34) is inserted and the edges being welded are pressed against it for sufficient time to deform the edge profile and improve correspondence. The edges are retracted from the cold mirror which is removed. The hot mirror (35) is inserted; the edges are pressed against it for a time sufficient to initiate edge melting, starting from the surfaces in contact. Retraction and extraction again follow, allowing the objects to be pressed together for sufficient time to weld and set the bond. The product is extracted. Preferred features: The hot and cold mirrors are one and the same, with hot and cold zones. The mirror is non-planar.