How to solve the problem of PPR pipe extruder in use
September 27, 2022
1. There are focal marks on the surface of the tube. The possible reasons are that the temperature of the body or the head is too high; the head and the filter are not cleaned; there are impurities in the pellets; the thermal stability of the raw materials is poor or the thermal stabilizer dosage is too small; the temperature control instrument fails.
2. There are black stripes on the surface of the pipe. The possible reason is that the temperature of the machine head is too high and the filter is not cleaned.
3. The surface of the pipe is dull. It may be that the temperature of the die is too low or too high.
4. There are wrinkles on the surface of the pipe. It may be that the temperature around the die is uneven; the cooling water is too hot; the traction is too slow.
5. The inner wall of the pipe is rough. It may be that the temperature of the mandrel is too low; the temperature of the body is too low; the temperature of the screw is too high.
6. There are cracks on the inner wall of the pipe, which may be impurities in the material; the temperature of the mandrel is too low; the temperature of the body is low; the pulling speed is too fast.
7. The inner wall of the tube is uneven, the screw temperature may be too high; the screw speed is too fast.
8. There are air bubbles on the inner wall of the tube, which may be damp.
9. The thickness of the pipe wall is uneven. It is possible that the die and the core mold are not aligned; the temperature of the machine head is uneven; the traction is unstable; the compressed air is unstable.
10. Tube bending The wall thickness of the tube may be uneven; the temperature around the machine head is uneven; the cooling groove of the machine head, the traction cutting center is not aligned; the holes at both ends of the cooling groove are not concentric.
11. The product is brittle. It may be that the degree of plasticization of the body is not enough; the screw speed is too fast; the temperature of the machine head is too low; the viscosity of the resin is too high.
12. The longitudinal or transverse shrinkage of the pipe is large. It may be that the radial difference between the sizing sleeve and the inner diameter of the die is large (transverse); the traction speed is high (longitudinal).
13. Sudden slow discharge. The temperature in the feeding section of the screw may be high; the machine body enters the water; the melt pressure of the machine head is small.
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September 27, 2022
