PPR pipe production line product introduction

PPR pipe production process
Raw materials + masterbatch → mixing → vacuum feeding → raw material drying → single screw extruder → color line extruder → spiral mold → sizing sleeve → spray vacuum shaping box → spray cooling water tank → inkjet printer → crawler tractor → finished product inspection and packaging
How to solve problems encountered during the production of PPR pipes
1. There are scorch marks on the surface of the pipe. The possible reasons are that the temperature of the machine body or the head is too high; the head and filter are not cleaned; there are impurities in the pellets; the thermal stability of the raw materials is poor or the thermal stabilizer is too little; the temperature control instrument fails.
2. There are black stripes on the surface of the pipe. The possible reasons are that the head temperature is too high and the filter is not cleaned.
3. The surface of the pipe is dull. It may be that the die temperature 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 core rod temperature is low; the body temperature is too low; the screw temperature is too high.
6. There are cracks on the inner wall of the pipe. It may be that the material has impurities; the core rod temperature is too low; the body temperature is low; the pulling speed is too fast.
7. The inner wall of the pipe is uneven. The screw temperature may be too high; the screw speed is too fast.
8. There are bubbles on the inner wall of the pipe. The material may be damp.
9. The thickness of the pipe wall is uneven. The die and the core die may not be aligned; the head temperature is uneven; the pulling is unstable; the compressed air is unstable.
10. The pipe is bent. The wall thickness of the pipe may be uneven; the temperature around the head is uneven; the head cooling groove and the pulling cutting center are not aligned; the holes at both ends of the cooling groove are not concentric.
11. The product is brittle. The plasticization degree of the body may be insufficient; the screw speed is too fast; the head temperature is too low; the resin viscosity is too high.
12. The longitudinal or transverse shrinkage of the pipe may be large. The radial difference between the sizing sleeve and the inner diameter of the die may be large (transverse); the pulling speed is too high (longitudinal).
13. The sudden slow discharge may be caused by high temperature in the feeding section of the screw, water entering the machine body, or low melt pressure in the die head.