This machine uses for making paper bags automatically from unbleached paper or printed paper roll, such as Kraft paper, food grade paper, etc. It is completed by auto center gluing, printing tracking, material folding, fixed length cutting, bottom indentation, bottom folding, bottom gluing, bag bottom forming and bag collecting at one time.This machine adopts motion controller and servo motor programming, operating easily, efficient production, stable running. It can produce various specifications and sizes of square bottom paper bags, bread bags, leisure food bags, shopping bags and other environmental paper bag special paper bag machine.