DFHQ500-700 belongs to plastic film bag-making machinery and can operate at a high speed under the unattended situation. It is a bag-making machine specially adapted to U type plastic films and can deal with bag, which is suitable for large, medium-sized or small bag-making producers. It has a high-speed operation ability of producing average 80-130m/min film bags per minute and can operate continuously and stably for a long time. While using, this machine can carry on blanking process in the case that no special operator operates and manages for a long time during operation. If raw materials use up, this machine will stop running automatically. If the operator fills the new film materials well, it will continue operating. Its key technology is imported from Japan's technology with many advantages such as servo drive control novel structure, reliable performance, high production efficiency, high automatic degree and firm seal etc. This machine is a new model which substitutes original bag-making machine.