Process for making a plastic material

US6375881B1 · kind B1 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Thomas Foelster · Grafenau, DE
• Ralph Greiner · Leonberg, DE
• Dirk Schaefer · Hamburg, DE

Key dates

• Filing date: Oct 26, 1999
• Grant date: Apr 23, 2002
• Expiry date: Oct 26, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2995/006
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for the preparation of fiber-reinforced plastic molding includes (1) shortening the fibers to a length of less than 30 mm; (2) introducing the fibers and the plastics present in the solid state, separately from one another, into a mixing chamber of a die press, wherein the plastic is in particulate form; (3) thoroughly mixing the plastic and fibers to give a solids mixture; (4) transporting the solids mixture through die orifices of the die press; (5) heating the solids mixture in the zone before or in the orifices of the die; (6) enclosing at least part or partly embedding the fibers by the plastic during or after the heating of the solids mixture; and (7) comminuting the granulated material for subsequent molding.