Screw tip for closing a temperature-control bore of an extruder screw

US6102560A · kind A · utility

Assignee

• Krauss-Maffei Kunststofftechnik GmbH · DE

Inventors

• Robert Grimm · Hofheim, DE
• Stefan Nikolaus · Stockdorf, DE

Key dates

• Filing date: Dec 17, 1998
• Grant date: Aug 15, 2000
• Expiry date: Dec 17, 2018

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/03
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An extruder screw, includes a head portion having a front end and having formed therein a temperature-control bore and a counterbore extending the bore to the front end for supply and drainage of a fluid. A locking screw has a screw thread, with a first section of the screw thread received in the bore and a second section of the screw thread extending in the counterbore and projecting out of the head portion. The extruder screw further includes a screw tip which threadably engages the second section of the screw thread to close off the extruder screw, and a sealing member which is received in a counterbore of the head portion, wherein the locking screw is so configured as to apply a substantial force against the sealing member when engaging the locking screw into the bore, to thereby effectively seal the bore.