Due to its excellent performance, the extruder barrel screw is widely used in central air-conditioning, household air-conditioning and the insulation and insulation of various hot and cold pipes and containers in construction, chemical industry, metallurgy, shipbuilding, medicine, vehicles and other industries. It is a new generation of high-tech products. Quality insulation products. However, product quality may still be unqualified due to various factors, such as excessive clearance, heating temperature control, unstable working speed, etc.
The impact of excessive fitting clearance between the extruder barrel and screw on product quality.
1. If the gap between the barrel and screw of the extruder is too large and the flow of extruded melt is unstable, horizontal wrinkles will easily appear on the surface of the product.
2. If the gap is too large, the extrusion melt pressure will be unstable, resulting in large changes in the geometric shape and size errors of the product cross-section.
3. If the gap is too large, the backflow phenomenon caused by the molten material moving forward in the barrel will increase, causing the molten material to stay in the barrel for too long and turn yellow, which will cause discoloration or scorch spots on the surface of the product.
4. The gap between the barrel and screw of the extruder is too large, which makes the output of extruded products unstable or reduced.
The impact of unstable heating temperature control of the extruder barrel screw on product quality:
1. The heating temperature control is unstable, resulting in uneven plasticization quality of the raw materials in the barrel, resulting in rough surface of the product and frequent water marks.
2. The cross-sectional size of the product is unstable, and the geometric size error fluctuates greatly.
3. Hard lumps often appear on the surface of the product.
4. The quality of the product is unstable, the strength is poor, and it is easy to be brittle during use.
The impact of unstable working speed of the extruder barrel screw on the quality of plastic products:
1. The longitudinal geometric shape of the product has large dimensional errors.
2. Lateral wrinkles often appear on products.
3. The surface of the product is rough, easily brittle or has local hard lumps.
The following factors affect the working speed of the extruder barrel screw:
1. The transmission V-shaped belt is seriously worn and the work is slipping.
2. The center distance of the V-shaped belt drive pulley is too small, so that the belt drive slope cannot work correctly with the trapezoidal slope of the pulley.
3. The temperature of the heating material in the barrel is low and the plasticization of the raw materials is uneven, which causes the screw rotation working load torque to increase and the screw speed to become unstable.
4. The thrust shaft of the screw is damaged, etc.
Post time: Oct-28-2024
