Shenglong Machinery Co., Ltd. is a professional manufacturer of screws and rubber-melting cylinders, possessing high technology, advanced facilities and newly technique. With ten years' experiences of making screws and rubber-melting cylinders, our company can produce single, cone twins and plane screws as well as rubber-melting cylinders with high standard, high precision properties on large scales. Our products match the known plastic machines of large and middle enterprises. Quality standards and technological parameters of our products reach the national level. Our main products are screws & barrels, parallel twin screws & barrels, conical twin screws & barrels, bimetallic screws & barrels as well as screws & barrel accessories. They are widely used in injection molding machines, extruders, rubber processing machines and other plastic and rubber machinery. Different plastic products need their corresponding screws to be made, and high benefits can be obtained due to high production, high quality, low cast. Our company also offers the services of designing, consulting, surveying and drawing about machine screws for customers. Quality, customer and high prestige are our goals. We welcome old and new customers all over the world to Zhoushan Shenglong Machinery Co., Ltd.all kinds of screws and barrels. single screw barrel,conical twin screw barrel,parallel twin screw barrel. twin screw barrel,bimetallic screw barrel, screw barrel for injection molding machine,screw barrel for extruder,screw barrel for rubber ,screw barrel for shoe making machine,screw barrel for rubber & plastic machine.