Device for producing a mixture from chemically reactive plastic components and permeated with reinforcement fibers

US6619834B2 · kind B2 · utility

Assignee

• Krauss-Maffei Kunststofftechnik GmbH · DE

Inventors

• Christoph Krader · Maxhütte-Haidhof, DE
• Wolfgang Sochtig · Germering, DE

Key dates

• Filing date: Jan 29, 2001
• Grant date: Sep 16, 2003
• Expiry date: Jan 29, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T83/9403
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Integrated in the mixing head of a polyurethane apparatus for producing a mixture stream of chemically reactive plastic components, is a cutting arrangement by which natural fibers or fiber strands of soft-elastic and tough consistency can be drawn from a continuous strand and, after cutting into fiber pieces of given length, can be introduced into the mixture stream. The cutting arrangement includes an inner guide tube which receives a fiber strand, drawn from a continuous fiber strand by two feed rollers, and fed via the guide tube and an outer support tube to rotating knife elements. By subjecting the guide tube to a vacuum and applying a compressed gas stream to the end of the outer support tube, the soft-elastic fiber strand is held straight in a manner which is optimal for the cutting process. The cut fiber pieces are introduced together with the gas stream into the mixture stream of chemically reactive plastic components.