At the molding station, PVC needs to be heated to a softened state for molding. The heating plate is controlled by an independent heater, but the molding mold itself below must be kept at a low temperature. The chiller continuously pumps circulating cooling water (typically 5-15°C) into the water channels inside the mold to quickly absorb heat. This ensures that the plastic sheet cools and solidifies rapidly upon contact with the mold, resulting in a clearly defined and dimensionally stable blister cavity. Insufficient cooling will cause the blister to deform or stick to the mold.

At the heat-sealing station, aluminum foil and plastic blister sheets need to be sealed under heat and pressure. The heat-sealing mold also requires circulating cooling water. Its function is to rapidly cool the sealed area immediately after heat-sealing, allowing the heat-sealed coating to solidify and set. This prevents the seal from sticking or deforming due to residual heat, ensuring a firm and smooth sealing line, and significantly shortening the cycle time of the sealing station, thereby improving the overall machine operating speed.