What is the difference between mold injection and blow molding?

2018-12-13 10:50:00        0

Many things in life now need to rely on molds, especially plastic mold processing, abound. Many people only know the mold injection molding process, but do not know there is a blow molding process, what is the difference between the two? Keshmei mold injection to answer for everyone:


What is the difference between mold injection and blow molding?


First of all, we understand what is mold injection and what is blow molding? If you know what the two are, I believe that it is easy to see the difference between the two.


Blow molding, also known as hollow blow molding, is a rapidly developing method of plastic processing. The tubular plastic parison obtained by extrusion or injection molding of the thermoplastic resin is heated to a softened state, and placed in a split mold. Immediately after the mold is closed, compressed air is introduced into the parison to inflate the plastic parison. The film is fastened to the inner wall of the mold, and is released by cooling to obtain various hollow products which are desired.


The manufacturing process of blown film is very similar to the blow molding of hollow products, but it does not use molds. This is completely different from the processing of injection molds. From the perspective of plastic processing skill classification, the molding process of blown film is generally included in the extrusion process. from. However, according to the parison production method, blow molding can be mainly divided into extrusion blow molding and injection blow molding, and newly developed ones have multi-layer blow molding and stretch blow molding.


The concept of plastic mold processing, that is, thermoplastic injection molding, is to melt the plastic material and then inject it into the membrane cavity. Once the molten plastic enters the mold, it is shaped into a desired shape by the cold cavity. The resulting shape is often the final product and no further processing is required prior to installation or use as a 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 main difference between blow mold processing and injection mold processing is the difference in products. Blow molding is a product formed by gas. The demand for injection molding is generally used to make thicker products. Blow molding is different. Because the product is thinner and more transparent, it is obvious that there are some shortcomings. Therefore, the requirements are high, and blow molding has some requirements on the resistance, stretchability, and the like of the material. The products for processing injection molds are thicker, relatively lower requirements, and the requirements for materials are lower.


What is the difference between mold injection and blow molding? Now you know it! The mold injection molding expert Ke Shimei, if necessary or in doubt, can call us.


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