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Liyang Xinming Shengyuan Plastic Industry Co., Ltd. plans to put into operation a ?57-?273 one-step production line, and use the original inner inflation line to transform it into a ?57-?426 one-step production line. The outer tube skin requires black materials. Through several days of technical exchanges and discussion The customer was finally chosen to cooperate with us by our excellent technology and good reputation. In a responsible attitude to the customer, the technical department sent professionals to the site to make a detailed plan, put forward many reasonable suggestions, and obtained the customer's Praise. In the specified time, we responded to the different needs of customers, especially the inoperability of black materials, which caused great difficulties in correcting errors. Our R & D team has overcome every difficulty and successfully tested the machine at the customer's site. Customers are highly appreciated.