PURPOSE: To obtain a resin having excellent physical properties, by a method wherein a thermoplastic resin is supplied to the first supplying port of a twin- screw type extruder having at least two supplying ports in the extruding direction, glass roving is supplied to the second and later supplying ports on the downstream of the point where the resin is melted, and the roving is fused and kneaded with the resin.
CONSTITUTION: A fixed amount of a thermoplastic resin is supplied to the first supplying port, the glass roving is continuously introduced to at least one of the second and later supplying port provided on the extruding direction side of the point where the resin is substantially fused, and the roving is melted and kneaded with the resin. Since glass fibers do not coexist with the resin in a plasticizing process of the resin, mechanical breakage of the glass fibers in the plasticizing region and accompanying abrasion of the device are avoided, the glass roving is broken in kneading and is dispersed on a single fiber level. Accordingly, a glass fiber reinforced resin having excellent physical properties can be obtained.
KISHIDA MINORU
FUJII HIROSHI
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