Failures That May Occur in Plastic Pipe Production Lines

⑴ The outer surface of plastic pipes is rough
Adjust the process temperature: lower the cooling water temperature. The optimal cooling water temperature for the PE pipe is 20~25℃; check the water path to see if there is blockage or insufficient water pressure; check whether the barrel, machine head and other heating rings are damaged; adjust the sizing sleeve. Water flow; consult the raw material supplier for the raw material parameters of this batch; check the mold core temperature, if it is higher than the die section temperature, lower the core temperature; clean the mold.
⑵ Grooves appear on the outer surface of plastic pipes
Adjust the water outlet pressure of the sizing sleeve, and the water output must be balanced; adjust the angle of the nozzle in the vacuum sizing box to ensure uniform cooling of the pipe; check whether there are debris, burrs, etc. in the die, sizing sleeve, cutting machine and other hardware.
⑶ Grooves appear on the inner surface
Check whether water has entered the inner tube. If water has entered, pinch the tube embryo that has just been exported from the mold to seal the inner cavity; lower the internal temperature of the mold; clean and polish the mold.
⑷ A jitter ring appears inside the pipeline
Adjust the water outlet of the sizing sleeve to make the water outlet even; adjust the vacuum degree of the second chamber so that the vacuum degree of the rear chamber is slightly higher than the vacuum degree of the front chamber; check whether the vacuum sealing gasket is too tight; check whether there is jitter in the tractor; check the output of the main engine Whether the material is uniform.
⑸ No vacuum
Check whether the water inlet of the vacuum pump is blocked. If it is blocked, use a needle to clear it; check whether the vacuum pump is working normally; check whether there is air leakage in the vacuum pipeline; check whether the small hole in the middle of the core mold pressing screw is blocked. If it is blocked, use a thin wire to clear it.
⑹ The outer diameter of the pipe is out of tolerance
The size of the outer circle can be changed by adjusting the degree of vacuum; the size of the outer circle can be changed by adjusting the traction speed; the size of the inner hole of the sizing sleeve can be corrected.
⑺ The roundness of the pipe is out of tolerance
Adjust the angle of the nozzle in the vacuum setting machine and spray box to ensure uniform cooling of the pipe; check the vacuum setting machine, the water level in 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 spray box If the water temperature is greater than 35°C, it is necessary to configure a chilled water system or add a spray cooling box; check the water path and clean the filter; adjust the process; check and correct the inner hole roundness of the sizing sleeve; adjust the pipe guide and clamping device to correct The ovality of the pipe.
⑻ Uneven pipe wall thickness
Adjust the wall thickness on the mold; adjust the angle of the nozzle 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 flow even; disassemble the mold, check whether the screws inside the mold are loose, and tighten them again.