... shopping bag, vest bag, and agriculture film 45*2/50*2/55*2 Double Color Bar Film Blowing Machine Widely used for making shopping bag, vest ... screw stems of model SJ Series color bar film extruders are made of high-quality alloy steel with optimum hardness and strong ... plug-in plate mechanism for making vest bag ,The coiling unit adopts torque motor to keep proper tension and make rolling ...