Answers To Common Production Technology Issues Regarding PPR Pipes

There may be some problems during the production of PPR tubes. Below, the editor has summarized a few points, hoping to help everyone.

1. The uneven inner wall of the pipe may cause the screw temperature to be too high; The screw speed is too fast.

2. The black stripes on the surface of the pipe may be due to the high temperature of the machine head and the unclean filter.

3. There may be bubbles on the inner wall of the pipe, indicating that the material has been dampened.

4. Sudden slow discharge may result in high temperature in the screw feeding section; Water ingress into the fuselage; The dissolution pressure of the machine head is low.

5. The roughness of the inner wall of the pipe may be due to the low temperature of the core rod; The body temperature is too low; The temperature of the screw is too high.

6. The lack of gloss on the surface of the pipe may be due to the mold temperature being too low or too high.

7. Wrinkles on the surface of the pipe may be due to uneven temperature around the mouth mold; The cooling water is too hot; Traction is too slow.

8. Cracks on the inner wall of the pipe may indicate impurities in the material; The temperature of the core rod is too low; Low body temperature; The traction speed is too fast.

9. The possible reason for the burnt marks on the surface of the pipe is that the temperature of the machine body or nose is too high; The machine head and filter were not cleaned thoroughly; There are impurities in the granular material; Poor thermal stability of raw materials or insufficient thermal stability dosage; The temperature control instrument is malfunctioning.

10. The longitudinal or transverse shrinkage of the pipe may result in a large radial difference (transverse) between the sizing sleeve and the inner diameter of the die; The traction speed is too high (longitudinal).

11. Uneven thickness of the pipe wall may result in misalignment of the mouth mold and core mold; Uneven temperature of the machine head; Unstable traction; Compressed air is unstable.

12. The brittleness of the product may indicate insufficient plasticization of the body; The screw speed is too fast; The temperature of the machine head is too low; The resin viscosity is too high.

13. Pipe bending may result in uneven wall thickness of the pipe; Uneven temperature around the machine head; The cooling groove of the machine head and the traction cutting center are not aligned; The holes at both ends of the cooling trough are not concentric.