Zhoushan Longwei Plastic Machinery Co., Ltd. is a pvc crust foam board screw barrel manufacturer,it located in Jintang Town, Dinghai District, Zhoushan City, Zhejiang Province, China. Founded in 2004, the company is a well-known enterprise specializing in the design, development, production, and sales of pipe screw barrel, barrel, and conical twin screw and barrel. Our Products 1) 65Film Blowing Barrel 2) 65Come twin Barrel 3) 92/188 SPC Screws 7 sections 3 heads