Process for forming hollow bodies of thermoplastic material

摘要

A process for stamping blanks of thermoplastic material for use in the formation of hollow bodies in which prior to the stamping operation the blanks are heated in predetermined heated zones to the fusion point of the thermoplastic material with the heated zones being surrounded by zones which remain below fusion temperature and which in the formation of hollow cylindrical bodies, the heated zones are in the form of continuous or interrupted ring segments which are radially interconnected.