How to distinguish injection mold and blow mold

How to distinguish injection mold and blow mold

Blow molding mold processing concept, blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin, while the plastic parison is heated to a softened state, is placed in a split mold. After the mold is closed, compressed air is passed into the parison to blow the plastic parison And close to the inner wall of the mold, after cooling and demoulding, you can get all kinds of hollow products you want.
The manufacturing process of blown film is very similar to the blow molding of hollow products in principle, but it does not use a mold. This is completely different from the processing of injection molds. From the perspective of the classification of plastic processing technology, the forming process of blown film is usually included in the extrusion from. However, according to the method of making parisons, blow molding can be mainly divided into extrusion blow molding and injection blow molding, and newly developed multilayer blow molding and stretch blow molding.
Injection mold processing concept, that is, thermoplastic plastic injection molding, this method is to melt the plastic material and then inject it into the film cavity. Once the molten plastic enters the mold, it is cooled to form the desired shape according to the cavity. The resulting shape is often the final product, and no further processing is required before installation or use as the final product. Moreover, in the processing of injection molds, there are many details, such as protrusions, ribs, and threads, which can be formed in one step of injection molding. The figure below is the processing diagram of the injection mold of the driving recorder.
The above understands the concept between the two. In fact, the main difference between blow mold processing and injection mold processing is the difference in products. Blow molding is a product formed using gas. Injection molding is generally used Make thicker products. Blow molding is different, because the product is thinner and more transparent, and the shortcomings are obvious. Therefore, the requirements are higher, and blow molding has some requirements on the toughness and stretchability of the raw materials. The products for processing injection molds are thicker, and the requirements are relatively lower, and the requirements for raw materials are also lower.

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