| 摘要 |
PURPOSE:To obtain a plastic screwlike molding that is reinforced highly with reinforcing fibers, and is lightweight, corrosion-resistant, chemical-resistant and electrically insulative, by making said body of a resin composition that consists of a polyphenylene sulfide resin and inorganic reinforcing fiber and has a specified melt viscosity. CONSTITUTION:PPS resin includes crystalline linear high polymer molecules having a structure shown at the equation wherein (n) is a natural number and is excellent in heat resistance. The melt viscosity is to be 1X10<4>-10<6> poises at 300 deg.C and a shear rate of 10<2>/sec. The reinforcing fiber that will be contained in the composition may be inorganic or organic and will be mixed with the thermoplastic resin in a mixer such as a supermixer, and the composition is kneaded and molded by an extruder or the like into a cylindrical stock. In the process of forming threads on the stock, use is made of a thread rolling machine such as a flat die thread rolling machine, a round die thread rolling machine, etc. that will be usually used in forming metal screws. |
