hangzhou shuanglin plastic machinery co., ltd., established in 1987, is a leading hi-tech company. it spec-ializes in development and production of com-posite pipe production line, plastic pipe prod-uction line and kinds of pipe molds and plastic auxiliary machines. at present, it has standard workshop about 15,000 square meters. it is situated near to the beautiful west lake in hangzhou, and at the transportation key position of shanghai, hangzhou and ningbo, enjoying convenient transportation by ship, vehicle and plane..