Method for the manufacture of shaped bodies formed from plastics-filler mixtures having a high filler content

US5804116A · kind A · utility

Assignee

• SGL Technik GmbH · DE

Inventors

• Manfred Schmid · Neutraubling, DE
• Ernst Tetzlaff · Heidenheim, DE

Key dates

• Filing date: Nov 14, 1996
• Grant date: Sep 8, 1998
• Expiry date: Nov 14, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/50
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method for the manufacture of shaped bodies by extrusion moulding of plastic-filler mixtures with filler contents of more than 50% by volume, preferably from 65 to 90% by volume, by means of an extruder with a conveying input zone. The method is restricted to use of fillers having good thermal conductivity. For carrying out the method, initially a mixture is manufactured from molten or fluid synthetic resin and the filler and this is ground and graded after cooling. Afterwards, there is extrusion of the ground mixture or of fractions separated from this and graded. According to a preferred variant of the method, an extruder is used for the extruding having a conveying input zone whose extrusion part consists merely of an input zone and an output zone. According to a further variant of the method, plates are manufactured by cutting up lengthwise a tubular extrusion emerging from the mouthpiece in the extruding and the casing of the extrudate thus obtained is bent flat and this extrudate is then cut up into plate lengths.