SBH330B/450B series roll fed square bottom paper bag machine is designed to manufacture square bottom paper bags from paper roll in blank or printed. Side gluing, tube forming, tube cutting, bottom creasing, bottom gluing, bottom forming and final product out feed can be completed within one time by this machine. It is ideal equipment for making middle to bigger size paper bags for square bottom, shopping bag and so on. The paper bag machine use German machinery manufacturing technology and ideas, by the high speed movement the central control system (CPU) control, the bag length can be adjusted by servo system.