The Composition And Screw Structure of Single Screw Extruder Are Introduced

Single screw extruder is mainly composed of the following parts:

1. Drive device: provides rotary power for the screw, usually including motor, reducer, etc.

2. Hopper: used to hold plastic raw materials and feed them into the barrel.

3. Barrel: It is a place where plastics are heated and plasticized, generally heating and cooling devices.

4. Screw: It is the core part of the extruder, responsible for conveying, compression, plasticizing and so on.

5. Heating and cooling system: control the temperature of the barrel and screw to ensure good plasticization and molding of the material.

6. Head and die: make the melt form a specific shape and size, such as pipe head, plate head, etc.

7. Control system: used to control the parameters of the extruder, such as temperature, speed, pressure, etc.

The screw structure of single screw extruder mainly has the following types:

1. Gradual type screw: the depth of the screw groove gradually becomes shallow from the feeding section to the homogenizing section, which is conducive to the gradual compression and plasticization of the material.

2. Mutant screw: There is a more obvious mutation in the depth of the screw groove between the feeding section and the homogenization section, which can achieve a larger compression ratio in a shorter screw length.

3. Universal screw: It integrates some characteristics of gradual and mutant type, and has a wide range of applicability.

4. Barrier screw: The barrier section is set on the screw to improve the plasticizing quality and mixing effect.

5. Pin type screw: Pin is distributed on the screw, which enhances the cutting, mixing and homogenization of the material.