Draw ratio refers to the film drawing speed and the speed ratio between the pipe ring of the extrusion. Draw ratio of the longitudinal stretching ratio, the film having the orientation in the direction of taking the lead. Draw ratio increases, the longitudinal strength will also increase, and the thickness of the thin film, but if too much traction than blowing machine, film thickness is difficult to control, there might even pull off the film. Low density polyethylene (LDPE) film of traction control than the average between 4-6 is appropriate. [Only when the traction auxiliary understand the true meaning of your functions, courier bags blowing machine factory outlets, will be possible in the selection of the machine better. Said yesterday that the sixth question, today to talk about the seventh question: about Winder Winder There are many types: single winder, double winder, proactive winder, passive (by roll) income winder, ranked roll winders, automatic roll changing winding machine, etc., in the selection of winding machine's configuration, produce products according to their different requirements to select the winder. Plastic film blowing machine, day strong machinery, film blowing machine provided by the Dongguan City Machinery Co., Ltd. strong. Dongguan City-Machinery Co., Ltd. (rqjx1688.1688.com) (www.szfstjx.com) is an industry leader in Dongguan, Guangdong, film blowing machine, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum to meet customer needs. In the day strong mechanical leadership with the staff warmly welcome all inquiries negotiations to create the day strong mechanical better future.