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What is the difference between injection molding and blow molding?


Author: MULAN -Plastic Molding Manufacturer

What is the difference between the two processes of injection mold and blow mold? The following editor of Xingye Plastic Mold Factory will introduce it to you. 1. Injection mold Injection molding is thermoplastic 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 will be cold-formed and processed into the desired shape. The shape is often the final appearance of the finished product. , no other processing is required. In addition, the injection molding process can control the details very well, such as protrusions, ribs, threads, etc. can be formed in one step in injection molding.

2. Blow molding mold Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. The processing principle is as follows: Put thermoplastic resin or injection-molded tubular plastic billet into the mold, inject compressed air after the mold is closed, make the plastic billet expand and stick to the inner wall of the mold, then cool and demould, and finally get the desired hollow product. The manufacturing process of blown film is in principle very similar to hollow products, but its production does not use molds, which is completely different from the processing of injection molds.

From the perspective of plastic processing technology classification, the molding process of blown film is usually included in the extrusion process. According to the blank production method, blow molding can be divided into extrusion blow molding and injection blow molding, and the newly developed ones are multi-layer blow molding and stretch blow molding. For more information about injection molds, please visit the official website of Xingye:

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