Method of keeping nozzle bodies or breaker plates clean during extrusion of polymer melts

US4124666A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gerd Wilhelm · Überlingen, DE
• Artur Jaschke · Cologne, DE
• Hans J. Simon · Dormagen, DE
• Jens Schmidt · Höflaweg, DE
• Surinder S. Sandhu · Dormagen, DE

Key dates

• Filing date: Jun 29, 1977
• Grant date: Nov 7, 1978
• Expiry date: Jun 29, 1997

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/50
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method of keeping nozzle bodies or breaker plates clean during extrusion of polymer which can be shaped from the melt which comprises preventing the formation of deposits near the nozzle orifices by gassing these orifices at the point of extrusion of the melt, said gas consisting entirely or partly of vapors of substances which have a depolymerizing action on the deposits formed from the melt at the edge of the nozzle orifice.