In different application fields, what are the special requirements and adjustment methods for extruder exhaust screws?

1. Plastics field

Special requirements:
Plastics are of various types, including polyolefins, polyamides, polystyrene, etc. Different plastics have different characteristics such as melting temperature, viscosity, thermal stability, etc. The exhaust screw should adapt to the extrusion process of different plastics to ensure that the gas and volatiles in the molten material are effectively removed to avoid defects such as bubbles and cracks in the product.

Adjustment method:
Select the appropriate screw speed and temperature setting according to the melting temperature and viscosity of the plastic. Adjust the length of the exhaust section and the number of exhaust ports to meet the exhaust requirements of different plastics.

2. Rubber field

Special requirements: Rubber materials have high viscosity and elasticity, and bubbles and volatiles are easily generated during extrusion. The exhaust screw of the extruder needs to have strong mixing and plasticizing capabilities to ensure uniform extrusion of rubber materials and high-quality products.

Adjustment method: Select the screw speed and temperature setting suitable for rubber materials to improve the mixing and plasticizing effect. Increase the length of the exhaust section and the number of exhaust ports to fully remove bubbles and volatiles in the rubber. Clean and maintain the exhaust screw regularly to prevent rubber materials from remaining and decomposing on the screw.

3. Food field

Special requirements: Food materials usually have high requirements for hygiene, and pollution and odor need to be avoided during the extrusion process. The exhaust screw needs to adapt to the extrusion characteristics of different food materials to ensure the taste and quality of the product.

Adjustment method: Select screw materials and lubricants that meet food grade requirements to ensure the hygiene of the extrusion process. According to the extrusion characteristics of food materials, adjust the screw speed and temperature settings to obtain the best extrusion effect. Clean and disinfect the exhaust screw regularly to prevent food contamination and odor.

4. Pharmaceutical field

Special requirements: Pharmaceutical materials have high requirements for purity and cleanliness, and pollution and impurities need to be strictly controlled during the extrusion process. The exhaust screw needs to adapt to the extrusion characteristics of different pharmaceutical materials to ensure the safety and effectiveness of the product.

Adjustment method: Select screw materials and lubricants that meet pharmaceutical grade requirements to ensure the cleanliness of the extrusion process. According to the extrusion characteristics of pharmaceutical materials, adjust the screw speed and temperature settings to obtain the best extrusion effect and product quality. Clean and calibrate the exhaust screw regularly to ensure its accuracy and stability.