Cooling, injection mold cores designs

In injection blow molding, the rtielt is injected into a parison cavity around a core rod (Figure 1.4). The test-tube shaped parison, while still hot, is transferred on the core rod to the bottle blow mold cavity where the bottle is blown and cooled. Injection blow molding is generally used for bottles less than 0.5 liter in size. This type of blow molding allows for a scrap free product and for design of intricate shapes such as tamperproof closures. It is impractical for containers with handles. 

The importance of proper cooling system design can be sununarized in two major areas of interest to the plastics industry quality and productivity. Quality has become a major area of emphasis in the industry over the last few years. The quality of the product that can be produced from an injection mold can be directly attributed to three factors the accuracy of fabrication of the mold cavity and core, the repeatability of the molding machine used, and the correct design of the mold to produce Ae part. Part of the correct design of the mold will be a cooling system that will extract heat from the melt in the mold cavity at the maximum rate possible, uniformly throughout the mold. 

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