초록 ▼

The manufacture is carried out by impregnating bundles of filaments of fibrous-reinforcing material in a bath made up of an emulsion of a thermoplastic resin and a blowing agent. The emulsion-impregnated reinforcing filament bundles are then squeezed and dried to form resin coatings, and then collec

The manufacture is carried out by impregnating bundles of filaments of fibrous-reinforcing material in a bath made up of an emulsion of a thermoplastic resin and a blowing agent. The emulsion-impregnated reinforcing filament bundles are then squeezed and dried to form resin coatings, and then collected to provide a single bunch of the fiber-reinforced thermoplastic resin material. This bunch is subsequently heated and allowed to expand in a tunnel and also cooled in a tunnel to produce a fiber-reinforced thermoplastic resin of a cellular structure. During the impregnation with the emulsion in a bath, the bundles are slackened and repeatedly beaten in the condition of free tension to cause the filament bundles to be substantially frayed to facilitate the impregnation. An apparatus utilizable in the practice of the above method is also disclosed.

대표청구항 ▼

A method for manufacturing a fiber-reinforced thermoplastic resin of cellular structure, which comprises the steps of: continuously supplying a plurality of bundles of filaments of fibrous reinforcing material in side-by-side relation to each other; impregnating the bundles of filaments of fibrous r

A method for manufacturing a fiber-reinforced thermoplastic resin of cellular structure, which comprises the steps of: continuously supplying a plurality of bundles of filaments of fibrous reinforcing material in side-by-side relation to each other; impregnating the bundles of filaments of fibrous reinforcing material with an emulsion of thermoplastic resin added with a flowing agent in a bath, where said bundles are transported therethrough while said bundles are slackened and concurrently repeatedly beaten in the condition of free tension to cause said bundles to be substantially frayed to facilitate penetraton of the emulsion composition into the filaments; squeezing out the excess emulsion to control the amount of the emulsion adhering to the reinforcing filament bundles; drying the emulsion-impregnated reinforcing filament bundles to obtain the fiber-reinforced thermoplastic resin material; collecting the dried reinforcing filament bundles together to provide a single bunch of the fiber-reinforced thermoplastic resin material, said bunch being shaped not larger than a cross-section of a proceeding tunnel for expanding; heating the bunch of the fiber-reinforced thermoplastic resin material to be allowed to expand in the heating tunnel at a temperature higher than that of decomposition of the blowing agent, which has a desired cross-section of a final product to control the expansion of the bunch of the fiber-reinforced thermoplastic resin material; cooling the expanded fiber-reinforced thermoplastic resin material in a cooling tunnel, which has the same cross-section as the heating tunnel, to provide the fiber-reinforced thermoplastic resin of cellular structure; and drawing the cooled fiber-reinforced thermoplastic resin of cellular structure.