Uses and criteria: The plastic flat film drawing machine set is newly developed on the basis of introducing, digesting and absorbing advanced technology at home and abroad. It adopts internationally advanced electrical digital analogue control technology such as microcomputer-controlled frequency conversion and speed regulation, thus making the main indexes of the unit reach the international advanced level, with its high production efficiency and good quality of silk cylinder forming. And the advanced PLC feedback system can be added according to different needs in order to improve the precision of the plastic yarn.