The main cooling system of blow molding product mold

Author: MULAN - Plastic Molding Manufacturer

The main cooling system of blow molding product mold For almost all extrusion molding, injection molding, hollow blow molding and other methods, the productivity of blow molded products depends largely on the efficiency of heating and cooling of plastics. During the cooling process, the heat of the molten plastic is taken away by the mold, so that the product is cooled and set; in blow molding The cooling time of blow molding products accounts for 60% to 80% of the molding cycle, and up to 90% for large and thick-walled products. The cooling methods of blow molded products can be divided into three types: external cooling, internal cooling and post cooling. The main cooling system of the blow molding product mold is composed of external cooling and post cooling. 1. External cooling method External cooling refers to setting up a cooling system in the mold wall to cool the blow molded product through heat transfer through the outer wall. The common way to set up a cooling system in the mold wall is to drill cooling channels in the vertical and horizontal directions in the mold wall. The water channel of the cooling system in this way can be manufactured by machining, and the manufacture is simple, convenient and low in cost. The spiral copper sheet or stainless steel spiral sheet installed in the channel can divide the cooling water into two helical cooling water flows, increase the degree of turbulence of the fluid, and make the cooling water flow helically move along the outer wall of the cooling water hole, which can Accelerating the cooling rate also reduces the formation of scale in the cooling water channel. Drilled cooling channels are easy to clean and allow for easy modification. 2. Post-cooling method Both internal and external cooling methods are for the parison in the blow mold. If at a higher temperature, the blow molding product is taken out of the mold as soon as possible, and placed in the rear station for cooling, the molding cycle of blow molding can be significantly shortened. This process is called post-cooling method. When demoulding, the temperature should not be too high. Generally, the mold can be opened after half of the normal cooling time to maintain The shape of blow molded products. Proficient in moulds|blow molding products| Started in 1998, trustworthy.