Process for compounding thermoplastic resin and fibers

Details Process for compounding thermoplastic resin and fibers Process for compounding thermoplastic resin and fibers

1991-07-10

1993-02-09

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264 404, 26421121, 26421123, 264325, 264349, 425205, B29B 1116

Patent

active

051851172

ABSTRACT:
Multiple extruder apparatus for compounding thermoplastic resin and reinforcing fibers incorporates a resin extruder in which thermoplastic resin pellets are melted and a compounding extruder in which the molten thermoplastic resin is mixed in intimate contact with long reinforcing fibers of at least one inch in length. The melted thermoplastic resin is introduced into the compounding extruder at a point downstream of the inlet point for the reinforcing fibers, so that the fibers are mechanically worked and heated before coming into contact with heated, molten thermoplastic resin. The extrudate from the compounding extruder consists of a homogeneous, molten mass of thermoplastic resin having discrete lengths of fibers randomly dispersed therein. This hot mixture may be fed directly into preform-making equipment to produce a measured preform of desired size, weight, and shape. The preform may then be fed directly into a compression molding machine.

REFERENCES:
patent: Re32772 (1988-10-01), Hawley
patent: 4439387 (1984-03-01), Hawley
patent: 4616989 (1986-10-01), Mewes et al.
patent: 4708623 (1987-11-01), Aoki et al.
patent: 4897233 (1990-01-01), Bier et al.
patent: 4927579 (1990-05-01), Moore

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