The high and low density polyeghylene film bags produced bu the machine are applied to shopping in the supermarkets, shops and markets.This machine specially designed point-cut rolling dual-purpose one for vest&flat bags, is controlled bu a computer.The step(servo)setting length system reduces the sealing-cutting dimensions errors, and the installation of photoelectric eyes track help make the position of figure of printing bags accurate.The computer numerical control can bee selected to adjust the length of bag.The machine will automatically stop and sound a warning if there is something wrong with the printing bags.