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What is an injection molding machine screw?

writer:LI SONG Share

The injection molding machine screw is an important part of the injection molding machine, which is mainly used for conveying, compacting, melting, stirring and pressing plastic.

What is the role of the injection molding machine screw?
All of this is accomplished by the rotation of the screw in the barrel. When the screw rotates, the plastic will generate friction and mutual movement on the inner wall of the barrel, the bottom surface of the screw groove, the screw edge advancement surface, and the plastic and the plastic. The advancement of plastic is the result of this combination of movements, and the heat generated by friction is also absorbed to increase the temperature of the plastic and melt the plastic. The design structure of the screw will directly affect the extent of these effects.
 

injection molding machine screw

What are the components of the injection molding machine screw?
Injection molding machine screw can generally be divided into three sections:
1. Blanking section: This is the first section where the plastic enters the screw. The screw rotates at the same time to stir in advance, so that the material and color masterbatch or other additives are evenly mixed.
2. Compression section: This is the middle section where the material enters the screw. At this time, the screw thread depth gradually changes and the rotating shear heats up to melt and plasticize the plastic.
3. Metering section: This is the last section where the material enters the screw, close to the nozzle. At this time, the plastic has been completely plasticized and uniform, waiting for the injection molding machine to perform the injection operation according to the metered amount.

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