Injection Molding Machine Screw Function and Classification

2021-11-02



Screw function and classification:

The plastic injection molding machine screw is a key component of the plasticized part, which is in direct contact with the plastic. The effective length of the plastic by the plastic injection molding machine screw groove passing through a long thermal history and undergoes a three-state (glass state, viscoelastic state, and viscous fluid state). The plastic injection molding machine screw length, geometry, and geometric parameters of each functional segment will directly affect the delivery efficiency and plasticization quality of the plastic, and will ultimately affect the injection molding machine cycle and product quality.


According to its adaptability to plastic, plastic injection molding machine screw can be divided into general screw and special screw. General-purpose plastic injection molding machine screw, also known as conventional plastic injection molding machine screw, can process most thermoplastic plastics with low and medium viscosity, crystalline and non-crystalline civilian plastics and engineering plastics. It is the most basic form of plastic injection molding machine screw.


Correspondingly, there are special screws, which are used to process plastics that are difficult to process with ordinary screws, such as thermosetting plastics, polyvinyl chloride, and high-viscosity PMMA screws.


According to the characteristics of the plastic injection molding machine screw structure and geometric shape, it can be divided into conventional screw and new type screw.

Conventional plastic injection molding machine screw, also known as three-section screw, is the basic form of plastic injection molding machine screw. There are many new types of screws, mainly including separation type plastic injection molding machine screw, split type plastic injection molding machine screw, wavy plastic injection molding machine screw, transverse plastic injection molding machine screw, non-metering section plastic injection molding machine screw, two-stage chlorine discharge plastic injection molding machine screw, strong mixing type plastic injection molding machine screw and so on.

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