This machine is specially-designed point-cut rolling dual-purpose one for T-shirt & Flat-opening bag, is controlled by 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 be selected to adjust the length of bag. The machine will automatically stop and sound a warning if there is something wrong with the printing the high and low density polyethylene film bags produced by the machine are applied to shopping in the super markets, shops and markets.