In the process of plastic extrusion line, because the operator is not proficient in the process and machine operation, the plastic pipe will often appear rough on the outside surface, jitter ring inside, uneven wall thickness, insufficient roundness, etc., so it must be adjusted in time. The quality of the product can only be improved by removing the failure of the plastic extrusion line for sale of plastic pipe.
Ⅰ. The outer surface of the plastic pipe of the extrusion line for sale is rough
Adjust the process temperature. Reduce the cooling water temperature, and the best cooling water temperature for PE pipes is 20-25℃. Check the water circuit for blockage or insufficient water pressure. Check whether the heating ring of the barrel, head, etc. is damaged. Adjust the sizing sleeve to enter water flow. Check the performance and batch number of the raw materials. Check the mold core temperature, and if it is higher than the die section temperature, lower the core temperature. Clean the mold aggregates.
Ⅱ. Grooves appear on the outer surface of the plastic pipe of the extrusion line for sale
Adjust the water outlet pressure of the sizing sleeve, and the water output is required to be balanced. Adjust the nozzle angle in the vacuum sizing box to make the pipe cool evenly. Check whether there are debris, burrs, etc. on the die, sizing sleeve, cutting machine and other hardware.
Ⅲ. Grooves appear on the inner surface of the extrusion line for sale
Check whether water enters the inner tube. If water enters, pinch the tube blank of the mold just after the exit to seal the inner cavity. Reduce the internal temperature of the mold. Clean and polish the mold.
Ⅳ. There is a jitter ring inside the pipe of the extrusion line for sale
Adjust the water outlet of the sizing sleeve to make it 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 seal is too tight. Check whether the tractor is shaking. Check the main engine whether the material is uniform.
Ⅴ. No vacuum in the extrusion line for sale
Check whether the water inlet of the vacuum pump is blocked. If it is blocked, unblock it. Check whether the vacuum pump is working properly. Check whether the vacuum pipeline is leaking. Check whether the small hole in the middle of the mandrel compression screw is blocked. If it is blocked, use a fine iron wire to unblock it.
Ⅵ. The outer diameter of the pipe of the extrusion line for sale is out of tolerance
The size of the outer circle can be changed by adjusting the vacuum degree. The size of the outer circle can be changed by adjusting the traction speed. The inner hole size of the sizing sleeve can be corrected.
Ⅶ. The roundness of pipe in extrusion line for sale is out of tolerance
Adjust the nozzle angle in the vacuum setting machine and spray box to make the pipe cool evenly. 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 more than 35℃, it needs to be equipped with a chilled water system or add a spray cooling box. Check the water circuit, and clean the filter. Adjust the process. Check and correct the inner hole diameter of the sizing sleeve. Adjust the pipe guide clamping device to correct Ovality of the pipe.
Ⅷ. The pipe thickness of the extrusion line for sale is uneven
Adjust the wall thickness on the mold. Adjust the nozzle angle in the vacuum setting machine and the spray box to make the pipe cool evenly. Adjust the water output of the sizing sleeve to make it even. Disassemble the mold, and check whether the screws inside the mold are loose, and re-tighten it.
Ⅸ. The plasticizing temperature of the extrusion line for sale is too high
Adjust the process. Adjust the heating temperature of the mold core and ventilate and cool the mold. The shear heat of the screw is too high, and replace the screw.
Ⅹ. The cutting length of the extrusion line for sale is not accurate
Check whether the long wheel is compressed. Check whether the long wheel swings, and tighten the fixing bolt of the long wheel frame. Check whether the travel switch of the plastic cutting machine is damaged. Check whether the rotary encoder is damaged. Check whether the wiring of the rotary encoder is disconnected (Whether the plug socket of aviation is in good contact). Each stand-alone enclosure (PE terminal) should be grounded 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 enclosure (PE terminal) is not allowed connect to the ground after connecting in series, otherwise it will introduce interference pulses and cause inaccurate cutting length.
Ⅺ. The problem of co-extrusion identification strips in extrusion line for sale
Diffusion of co-extrusion identification strips in pipe extrusion production line: Generally, it is caused by improper selection of co-extrusion materials used by users. Special materials such as PE should be used. If it is necessary, the temperature of the extrusion section can be reduced.
Co-extrusion identification bar can not be squeezed out: Stop the main extruder, turn on the co-extrusion machine first, turn on the co-extrusion machine for about 10 minutes, and then turn on the host.
Co-extrusion identification strips are too thin or too wide: Generally, it is caused by the mismatch between the extrusion volume of the co-extrusion machine and the traction speed of the pipe. The frequency of the co-extrusion machine inverter should be adjusted or the traction speed should be changed so that the two speeds can match; the second is co-extrusion The reason why the cooling water jacket of the unloading section of the machine does not pass through the cooling water.
In the actual production process of the pipe extrusion line, other abnormal situations will occur, which should be dealt with according to the actual situation.
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