During the injection molding process, the temperature of the injection molding machine increases by 100-350 ° C due to the melting of the rubber material. The injection molding of the rubber material takes only a few seconds, but within a few seconds, the rubber material cannot cool down completely. Therefore, a chiller is needed to solve this problem. The chiller transports the cooled water into the injection molding machine mold, and then cools the molding rubber material of the injection molding machine. The hot water returns to the chiller unit for further cooling.