Extruder for plastic granules

US5887972A · kind A · utility

Assignee

• Barmag AG · DE

Inventors

• Friedel Dickmeiss · Eschweiler, DE
• Klaus Schafer · Oelde, DE
• Wolfgang Imping · Remscheid, DE

Key dates

• Filing date: May 9, 1997
• Grant date: Mar 30, 1999
• Expiry date: May 9, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/288
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An extruder for melting plastic granules which is designed as a two-stage system in an integrated structural unit with an extruder chamber having an extruder screw in a heatable housing, as well as with a drying chamber having a heated conveying screw with displacement elements which dry the plastic granules and axially convey them to the extruder chamber without compression. In a preferred embodiment, the conveying screw has a larger diameter than the extruder screw, and displacement elements of greater depth than the extruder screw.