... make multi-layer three-side sealing laminated bags for food,powder,sweets BOPP,PET,CPP,PE, nylon HDL High-speed ( ... -layer three-side sealing laminated film bags (bags for food, washing powder and sweets, etc.) which take BOPP, PET, CPP, PE, nylon ... . Releasing tension can be controlled by full-automatic adjustable magnetic powder constant tension control system.4. Automatic alarm for releasing tension ...