How to extend the service life of Single Screw Rotor through regular care and maintenance

Working principle of single screw rotor in plastic extruder

1. Push the plastic raw material forward

Spiral groove design: The spiral groove design of Single Screw Rotor enables it to effectively push the plastic raw material forward. The gap between the spiral groove and the inner wall of the barrel forms a continuous channel, in which the plastic raw material is gradually pushed forward.

Shear force effect: As the Single Screw Rotor rotates, the spiral groove exerts shear force on the plastic raw material, causing it to gradually soften and mix evenly. The magnitude of the shear force is related to the speed of the screw and the geometric parameters of the spiral groove.

Continuous advancement process: The plastic raw material moves forward along the barrel under the push of the spiral groove and gradually approaches the die head. In this process, the temperature and pressure of the plastic raw material gradually increase, preparing for subsequent melting and extrusion.

2. Heating the plastic raw material to melt it

Heat conduction mechanism: During the rotation process, the Single Screw Rotor generates heat through friction with the inner wall of the barrel, and the heating device outside the barrel also heats the plastic raw material. This heat is transferred to the plastic raw material through the heat conduction mechanism, causing its temperature to gradually increase.

Melting process: As the temperature rises, the plastic raw material gradually changes from a solid state to a molten state. The molten plastic has better fluidity and plasticity, which is convenient for subsequent extrusion and molding.

Temperature control: Reasonable control of the temperature of the Single Screw Rotor is the key to ensuring uniform melting of the plastic raw material. Too high a temperature will cause the plastic raw material to degrade, and too low a temperature will affect the melting effect and extrusion quality.

3. Ensure that the plastic raw materials are evenly mixed

Shear mixing: The Single Screw Rotor applies shear force to the plastic raw material through its spiral groove to fully mix it in the barrel. Shear mixing can eliminate bubbles and impurities in the plastic raw material and improve its uniformity and consistency.

Pressure effect: As the Single Screw Rotor rotates, the plastic raw materials are subjected to pressure in the barrel, which promotes their mixing and melting. The magnitude of the pressure is related to the speed of the screw and the geometric parameters of the barrel.

Uniform distribution: After shear mixing and pressure, the plastic raw materials form a uniform molten state in the barrel, providing a good foundation for subsequent extrusion and molding.

Parameters such as the speed, temperature and pressure of the Single Screw Rotor have an important influence on the extrusion effect

1. The influence of speed on the extrusion effect

Residence time: The speed of the Single Screw Rotor determines the residence time of the plastic raw materials in the screw. The higher the speed, the shorter the residence time of the plastic raw materials, and the shorter the melting and mixing time.

Shear force: The size of the speed directly affects the size of the shear force. The higher the speed, the greater the shear force, and the better the softening and mixing effect of the plastic raw materials.

Production efficiency: Reasonable control of the speed of the Single Screw Rotor can improve production efficiency. Too high a speed will cause the degradation of the plastic raw materials, and too low a speed will affect production efficiency.

2. Effect of temperature on extrusion effect

Melting state: Temperature directly affects the melting state of plastic raw materials. The higher the temperature, the better the melting effect and fluidity of plastic raw materials.

Thermal stability: Reasonable control of the temperature of the Single Screw Rotor can ensure the thermal stability of plastic raw materials. Too high temperature will cause degradation of plastic raw materials, and too low temperature will affect the melting effect.

Energy consumption control: Temperature control is related to energy consumption control. Too high temperature will increase energy consumption, and too low temperature will affect production efficiency.

3. Effect of pressure on extrusion effect

Material advancement: Pressure ensures that plastic raw materials can pass through the die head smoothly and form the desired shape. The greater the pressure, the better the advancement effect of plastic raw materials.

Uniformity: Reasonable control of the pressure of the Single Screw Rotor can ensure the uniformity of plastic raw materials. Too high or too low pressure will affect the mixing and melting effect of plastic raw materials.

Equipment life: Pressure control is related to the life of the equipment. Too high or too low pressure will increase the wear of the equipment and shorten its service life.

How to regularly maintain and maintain the Single Screw Rotor to extend its service life

In order to extend the service life of the Single Screw Rotor and ensure its normal operation, regular maintenance and maintenance are essential.

1. Regularly check the wear

Regularly check the wear of the Single Screw Rotor and the barrel, and promptly detect and replace severely worn parts. Severely worn screws and barrels will affect the extrusion effect, causing equipment failure and production interruption.

2. Clean impurities and residues

Regularly clean the Single Screw Rotor and the barrel, remove attached impurities and residues, and keep their surfaces clean. Impurities and residues will accelerate the wear of the screw and affect the mixing and melting of plastic raw materials.

3. Reasonably lubricate the contact surface

Reasonably lubricate the contact surface of the Single Screw Rotor and the barrel to reduce friction and wear. Selecting a suitable lubricant and lubricating it according to the requirements of the equipment manual can effectively extend the service life of the screw and barrel.

4. Use the extruder strictly in accordance with the operating procedures

Use the extruder strictly in accordance with the operating procedures to avoid overload operation and frequent start and stop. Overload operation and frequent start and stop will increase the wear of the screw and barrel and shorten their service life.

5. Accurately control the heating and cooling system

Accurately control the heating and cooling system of the extruder to avoid excessive temperature or excessive fluctuation. Excessive temperature or excessive fluctuation will cause the screw material to soften and aggravate wear. Therefore, maintaining a stable temperature is the key to extending the service life of the screw.

6. Ensure the stability of the quality of plastic raw materials

Ensure the stability of the quality of plastic raw materials and avoid using raw materials containing impurities or uneven particle size. Impurities and raw materials with uneven particle size will accelerate the wear of the screw and affect the extrusion effect.

Through the above measures, the service life of the Single Screw Rotor can be extended, its normal operation in the plastic extruder can be ensured, and production efficiency and product quality can be improved.