Glass fiber-reinforced thermoplastic resin molding used e.g. for vehicle parts, is produced from granule having fibers aligned along its length, diluted by granules containing no fibers to improve distribution, appearance and strength

摘要

Fibers occupy 2-20 vol%, their mean length being 0.8-1.8 mm, with those over 2 mm long forming up to 20 wt.% of the fibers. Those 3 mm or longer form no more than 5 wt.% of the total weight of fibers. Independent claims are also included for: (A) The method of making the molding by injection, from the mixture of granules A and B. (B) The manufacture of the granules themselves, by impregnating continuous glass fiber skein in a bath of molten matrix plastic, twisting the skein and cutting it to granules. Preferred Features: A glass-fiber reinforced thermoplastic resin granule, known as granule A, of otherwise similar material is 2-12 mm long, with aligned or twisted fibers of the same length, forms 20-60 vol%. L/D2 is 0.45 or more. L/D is 1.1-6. Granules comprise types A and B mixed, where B has no fiber content. Their weight ratio A to B, is in the range 0.08 to 3. In the method, A granules flow more readily than B granules.