PRODUCTION OF MOLDING MATERIAL

摘要

PURPOSE:To obtain the molding material for fiber reinforced thermoplastic resin which is free from fluffing and thread breakage and homogeneous by applying a binding agent free from a film forming agent to glass fiber to make a fiber bundle and forming this fiber bundle into a cylindrically wound body and applying the film forming agent to the fiber bundle while pulling out it and thereafter coating thermoplastic resin thereon while drying the fiber bundle. CONSTITUTION:A sizing agent which contains a coupling agent and a lubricator and does not contain a film forming agent is applied to many glass fibers pulled out from a bushing. These many glass fibers are bundled and led to a guide member as a glass fiber bundle. The guide member is moved back and forth along a rotary shaft and the glass fiber bundle is wound into a cylindrical shape to make a wound body. Then this wound body is desirably preliminarily dried and moisture content is regulated to 0.5-13wt.% preferably 3-8wt.%. Thereafter, the glass fiber bundle is pulled out from the wound body and the film forming agent such as acrylic resin is applied thereto. This glass fiber bundle is dried (0.3-10kg preferably 0.5-5kg dry weight per 1000m) in a running state and thermoplastic resin is coated thereon.