Common problems and solutions during pipe extrusion

In the process of plastic PIPE production line, because the operator is not skilled in the process and machine operation, it often causes the plastic pipe to have a rough outer surface, a jitter ring inside, uneven wall thickness, and insufficient roundness. Therefore, it is necessary to adjust the process in time to eliminate the phenomenon. The failure of the plastic pipe production line can improve the product quality. 

1. Failure of the plastic pipe production line: the outer surface of the plastic pipe is rough
Adjust the process temperature; reduce the cooling water temperature, the maximum cooling water temperature of the PE pipe is 20 ~ 25 ℃; check the water channel for blockage or insufficient water pressure; check whether the heating ring such as the barrel and the head is damaged; adjust the water inlet of the sizing sleeve flow; check the performance and batch number of the raw materials; check the temperature of the core of the mold, if it is higher than the temperature of the die section, reduce the temperature of the core; clean the aggregate of the mold;

2. Failure of plastic pipe production line: groove marks appear on the outer surface of plastic pipe
Adjust the water pressure of the sizing sleeve, and the water output should be balanced; adjust the angle of the nozzle in the vacuum setting box to make the pipe cool evenly; check whether there are sundries, burrs, etc. in the die, sizing sleeve, cutting machine and other hardware;

3. Failure of plastic pipe production line: groove marks appear on the inner surface
Check whether the inner tube is filled with water. If water enters, pinch the tube blank that has just exited the mold to seal the inner cavity; reduce the temperature inside the mold; clean and polish the mold;

4. Failure of plastic pipe production line: jitter ring appears inside the pipe
Adjust the water outlet of the sizing sleeve to make the water outlet uniform; adjust the vacuum degree of the second chamber so that the vacuum degree of the rear chamber is slightly higher than that of the front chamber; check whether the vacuum gasket is too tight; check whether the tractor has jitter; Whether the material is uniform;

5. Failure of plastic pipe production line: no vacuum
Check whether the water inlet of the vacuum pump is blocked, if it is blocked, clear it; check whether the vacuum pump is working normally; check whether the vacuum pipeline is leaking; check whether the small hole in the middle of the compression screw of the core mold is blocked, if it is blocked, use a thin wire to clear it;
< br> 6. Failure of the plastic pipe production line: the outer diameter of the pipe is out of tolerance
Adjust the size of vacuum to change the size of the outer circle; adjust the traction speed to change the size of the outer circle; correct the size of the inner hole of the sizing sleeve;

7. Failure of the plastic pipe production line: the roundness of the pipe is out of tolerance
Adjust the angle of the nozzles in the vacuum setting machine and the spray box to cool the pipes evenly; check the water level in the vacuum setting machine and the spray box, and the pressure of the water pressure gauge to make the spray volume large and powerful; check the vacuum setting machine and the spray box If the water temperature is higher than 35℃, it is necessary to configure a chilled water system or add a spray cooling box; check the water circuit, clean the filter; adjust the process; check and correct the inner hole circularity of the sizing sleeve; Ovality of the pipe;

8. Plastic pipe production line failure: uneven pipe wall thickness
Adjust the wall thickness on the mold; adjust the angle of the nozzles in the vacuum setting machine and the spray box to make the pipe cool evenly; adjust the water outlet of the sizing sleeve to make the water outlet evenly; disassemble the mold, check whether the screws inside the mold are loose, and re-tighten them; 

9. Failure of plastic pipe production line: plasticizing temperature is too high
Adjust the process; adjust the heating temperature of the mold core, and ventilate and cool the inside of the mold; the shear heat of the screw is too high, replace the screw;

10. Failure of plastic pipe production line: inaccurate cutting length measurement
Check whether the length-measuring wheel is pressed tightly; check whether the length-measuring wheel swings, and tighten the fixing bolts of the length-measuring wheel frame; check whether the travel switch of the cutting machine is damaged; check whether the rotary encoder is damaged; Whether the plug socket is in good contact); each stand-alone shell (PE terminal) should lead the grounding wire to a total grounding point for reliable grounding, and the grounding point should have a grounding stake that meets the electrical grounding requirements, and each stand-alone shell (PE terminal) is not allowed. Connect to ground after series connection, otherwise interference pulses will be introduced, resulting in inaccurate cutting length.