Method for heating parisons made of thermoplastic material

US4423312A · kind A · utility

Inventors

• Walter Wiedenfeld · Hamburg, DE
• Wolfgang Reymann · Hamburg, DE

Key dates

• Filing date: Aug 19, 1982
• Grant date: Dec 27, 1983
• Expiry date: Aug 19, 2002

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C2035/0822
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Parisons are passed along a plurality of heating boxes for heating them to a temperature desired for blow molding. Individual radiators are switched off in groups to obtain varying temperatures along the axial direction of the parisons.