PE flat bag is a kind of bag with flat opening made of PE material. The general production steps are as follows: firstly, the polyethylene raw material in the hopper is sucked by a film blower, and then heated and dissolved; Secondly, the plastic film is blown out by an internal fan; Thirdly, the plastic film is obtained by the winding device of the machine; Finally, put the plastic film on the bag cutter, and cut and paste the PE flat pocket with appropriate size according to the required specifications.