PROCESS AND DEVICE FOR CONNECTING TOGETHER BY HEATED- TOOL BUTT-WELDING A VESSEL BODY OBTAINED BY EXTRUSION AND A VESSEL LID

摘要

Process and device for connecting together an extruded plastic cylindrical vessel body (2) with a plastic lid (1) by means of buttwelding of edges (4.5) heated with a heated plate (12) the said lid being deformed elastically to a larger diameter prior to butt-welding, the device for expanding the lid (1) having a conical expansion element (9), a supporting ring (10) and locking elements (11) holding the expanded lid at a diameter corresponding to the edge diameter of the body (2).