Patents Assigned to Krupp Corpoplast
  • Process for producing hollow bodies of oriented thermoplastic material
    Patent number: 4894198
    Abstract: In a process for producing hollow bodies of oriented thermoplastic material, a hollow blank having a bottom portion and a substantially cylindrical wall portion with an opening at its end remote from its bottom portion is subjected to pre-expansion in the region of the opening and then thermofixing in a subsequent treatment step. The thermofixing operation may be preceded by a mechanical expansion operation for orienting the plastic material forming the wall portion of the blank.
    Type: Grant
    Filed: December 4, 1987
    Date of Patent: January 16, 1990
    Assignee: Krupp Corpoplast
    Inventors: Peter Albrecht, Karl-Heinz Balkau, Vinco Cujic, Tilman Doring, Claus Horwege, Wolfgang Reymann, Klaus Vogel, Walter Wiedenfeld