Feeding Machine is a dispensable part for plastic molding process. With a motor driving air flow to default direction, the auto loader realizes material conveying due to difference pressure in hose. Thus, the material will fall to hopper receivers accordingly. The Feeding and Conveying Series mainly consist of two kinds of vacuum hopper loaders. One of them is featured with small volume and light weight for easy installation. People call it self-contained auto loader as the motor and hopper are in one unit. The other one is separate hopper loader, that means the control unit with motor is separate from hopper receiver. By this design, this kind of hopper loader is suitable for long distance conveying with larger motor power. Beside the design of structure and quality of motor, the program in PCB is important for a vacuum auto loader. In other word, it is the center part.