Extrusion blow molding of multilayer hollow bodies with layer disturbances limited to flash

US5141698A · kind A · utility

Assignee

• Krupp Kautex Maschinenbau GmbH · DE

Inventors

• Werner Daubenbuchel · Bensberg, DE
• Otto Eiselen · Rübhausen, DE
• Karsten Friedrichs · Bad Honnef, DE
• Erich Kiefer · Bonn, DE
• Peter Klusener · Bonn, DE

Key dates

• Filing date: Mar 15, 1991
• Grant date: Aug 25, 1992
• Expiry date: Mar 15, 2011

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C49/04
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

In a process and apparatus for the production of hollow bodies from thermoplastic material, having a wall of a laminate formed by at least first and second layers, by means of extrusion blow molding, a preform having a wall structure with a suitable number of layers is first produced in a batch-wise procedure using an extrusion head. The material required to produce the preform is guided in the extrusion head in such a way that disturbed portions of the laminate pass into the waste flash portions at the ends of the hollow body produced from the preform, so that the wall of the finished hollow body is devoid of disturbed laminate portions of that kind.