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AssigneeDynamit Nobel Aktiengesellschaft
InventorsHeinz Mewes, Wilhelm Nachtigall, Michael Wienand, deceased, by Anneliese Wienand, legal representative, by Hans-Jurg W. Wienand, heir, by Michael Wienand, heir, by Rudolf J. Wienand, heir, by Karl F. Wienand, heir, by Elisabeth H. M. Wienand, heir
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An improved process for incorporating glass fibers into a thermoplastic synthetic resin wherein the glass fibers are continuously mixed with a molten thermoplastic synthetic resin and the resulting mixture is shaped into a desired article, involves preheating the glass fibers to a temperature not more than the melting point of the synthetic resin, feeding the preheated glass fibers and the molten synthetic resin separately to a premixing chamber, intermixing the resin and fibers within the chamber and thereafter introducing the resultant premix continously and directly into a two-stage degasifying screw-type extruder for effecting further homogenization of the premix and for extruding the desired article. The two-stage degasifying screw-type extruder used for carrying out this process is provided with a screw having a constant screw pitch in the two stages and in each stage with a low pressure zone and a high pressure zone in succession.
An apparatus for incorporating glass fibers into a molten thermoplastic synthetic resin which comprises a two-stage degasifying screw-type extruder having an inlet for entry of a premix of preheated glass fiber and molten thermoplastic synthetic resin and an extrusion die at an outlet end thereof for extruding a mixture of said glass fibers and said molten thermoplastic synthetic resin, means for preheating glass fibers to a temperature from 60.degree. to 120.degree. C. below the melting point of the thermoplastic synthetic resin up to the melting point of the synthetic resin, a melt extruder for extruding molten thermoplastic synthetic resin, a premixing chamber provided with one inlet port for entry of the preheated glass fibers, with another inlet port for separate entry of the molten thermoplastic synthetic resin and with an outlet port for discharging a premix of glass fibers and molten thermoplastic synthetic resin, and feeding means for introducing the preheated glass fibers in metered amounts into the inlet port of said premixing chamber;
Dependencies are inferred from the claim text.