Extrusion molding, mainly suitable for thermoplastic molding, but also suitable for some good fluidity of thermosetting and reinforced plastic molding.The molding process is the use of rotating screw, will be heated molten thermoplastic raw materials, from the head of the required section shape extrusion, and then finalize the mold, and then through the cooler to make its cold hard curing, become the required section of the product.