Direct Processing of Continuous Fibers onto Injection Molding Machines

Author:

Truckenmuller F.M.1

Affiliation:

1. Institut für Kunststofftechnologie Universität Stuttgart Böblingerstraße 70 7000 Stuttgart 1, Germany

Abstract

A new injection molding process "DIF" (Direct Incorporation of Con tinuous Fibers) is proposed whereby roving strands are directly incorporated into the polymer melt by using a reciprocating-screw-plasticating unit. The DIF-technology offers the possibility to substitute the relatively expensive pultrusion process which is used to produce long fiber pellets. Furthermore it can be used as a fast and flexible R&D tool. In order to improve fiber dispersion with minimum fiber breakage a new mixing non-return-valve" LFMR" ( Long Fiber Mixing Ring) was developed based on the " Twente Mixing Ring." Its mixing capacity and influence on processing charactenstics, fiber breakage and property profile of the injection molded parts is examined and compared to a general purpose non-return-valve of the ring type. The results of fundamental mechanical and physical property investigations are presented including dispersion of fiber clusters and bundles, fiber length distribution and fiber orientation.

Publisher

SAGE Publications

Subject

Materials Chemistry,Polymers and Plastics,Mechanical Engineering,Mechanics of Materials,Ceramics and Composites

Reference13 articles.

1. Beiermeister, B. , B. Schmid, and F. Truckenmuller . 1991 "Faserlangenbestimmung an langfaserverstarkten Thermoplasten," 12. Stuttgarter Kunstoffkolloqium, 6-7 Marz, p. 9.

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