In the plastic caps and closures molding process, the temperature control is extremely important, it will not only affect the quality of the product but also affect the molding cycle. Different plastics have different fluidity, so their temperature control is not the same. Plastics with good fluidity are generally controlled at about 60°C; plastics with poor fluidity are generally controlled between 80°C and 120°C. In addition, the cooling process of crystalline plastics and non-crystalline plastics is not the same, this should be noted in the plastic caps and closure injection molding process.

   In the plastic caps and closures injection molding process, if the temperature is too high, it will affect the uneven shrinkage of the plastic caps and closure molding, resulting in deformation of the mold product; if the temperature is too low, it will reduce its mobility, resulting in the formation of defects or flow patterns on the surface after molding. If the temperature of the mold is not uniform, the temperature after curing will also be uneven, and stress will be generated, which will deform the molded product and cause cracking. Therefore, the temperature control has a great influence on the shrinkage, stability, and quality of the product, so we must pay special attention to the plastic caps and closures mold injection.