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

US5143681A · 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: Sep 1, 1992
• Expiry date: Mar 15, 2011

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C49/041
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

In a process and apparatus for the discontinuous production of preforms for producing hollow bodies from thermoplastic material, the wall of which is a laminate having at least first and second layers, by extrusion blow molding, the flow of material for forming the laminate is guided within the extrusion head which serves to produce the preforms, by suitable dimensioning of the volume of the duct system accommodating the laminate, such that regions of disturbed laminate occur in the end portions of the preform which are squeezed off the extruded preform by the blow molding mold as a waste portion.