What is the difference between injection molding machine and blow molding machine?

Injection molding and blow molding are two distinct manufacturing processes used to produce plastic products, and the machines used for each process are different in design and function.

Injection molding is a process in which molten plastic material is injected under high pressure into a mold cavity, where it cools and solidifies to form a plastic part. The injection molding machine has a hopper that feeds the plastic material into a heated barrel, where it is melted and then injected into a mold cavity by a reciprocating screw. Once the plastic has cooled and solidified, the mold is opened, and the finished part is ejected.

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Blow molding, on the other hand, is a process in which a hollow plastic part is formed by inflating a molten plastic tube or preform inside a mold cavity. The blow molding machine has a hopper that feeds plastic material into a heated extruder, where it is melted and then extruded into a hollow tube or preform. The tube or preform is then placed into a mold cavity, where it is inflated with compressed air to take the shape of the mold. Once the plastic has cooled and solidified, the mold is opened, and the finished part is ejected.

In summary, the main difference between injection molding and blow molding machines is the way in which plastic material is formed and shaped. Injection molding machines inject molten plastic material into a mold cavity, while blow molding machines use compressed air to inflate a hollow plastic tube or preform inside a mold cavity.





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