Http://www.hbzkbc.com hollow plate production line according to the main control parameters and control requirements are divided into six main parts, namely the part of the extruder, molding parts, vacuum forming section, traction, heat treatment part, processing part. Its control structure and process flow diagram shown in Figure 1 and Figure 2. By a certain percentage of plastic raw materials with a good feeder given away by the extruder barrel, in the extruder, after heating the liquid into a paste, and then by plastic extruder slurry into touch with the preliminary forming a preliminary molded into the shape of a plastic hollow board in tow tractor under vacuum stereotypes, hollow vacuum forming after by another tractor anyone to moderate heat heating unit to eliminate the stress of plastic, and finally by cutter cut into different specifications. In order to ensure product quality, although the stability and reliability requirements of the extrusion speed, mold temperature, vacuum pressure, speed and other parameters traction reasonable control. If done manually, obviously very difficult to meet the requirements, so the introduction of the computer control based on CAN bus.