Common Problems and Solutions of PVC Trunking Production

1, the material within the head decomposition, PVC trough surface decomposition of the yellow line marks

① die temperature is too high. Should reduce the die temperature.

② poor stability of raw materials and dry mix. Should check the reasons for poor thermal stability of raw materials and mixed quality.

③ nose surface has depression or accumulation. Check and clean the head.

④ die structure is unreasonable. Should try to eliminate the dead ends of the nose, reducing the material in this stay time.

2、PVC线槽表

2, PVC trough surface rough, there node, cloudy corrugated

① material mixing quality is poor, uneven. The mixing process should be checked to improve the quality.

② head temperature is low. Should be appropriate to improve the head temperature.

③ excessive lubricant outside. Should reduce the amount of external lubricant.

④ die wall with sticky precipitates. Should clean up the die.

⑤ die resistance is not enough Should reduce the filter, filter plate cross-section, increase the amount of extrusion.

3, PVC trunking size does not meet the specifications

① vacuum is not enough, fixed mold gap gap. Should improve the vacuum, clean up the mold gap.

② traction too fast, insufficient amount of extrusion. Should be appropriate to reduce the speed of traction, improve speed.

4, PVC trough precipitation

① There is a certain amount of low molecular weight volatiles in the formulation, and the discharge effect is not good during the mixing process. Should be used with little or no low-molecular substances, with high-molecular material instead.

② low melting point of the lubricant and other components in the compatibility of poor compatibility. Should use high melting point of the lubricant or to minimize the amount of lubricant.

③ extrusion die temperature is low and too close with the stereotypes die. Should be appropriate to improve the extrusion die temperature.

④ stereotypes vacuum is too large, reduce the vacuum.

5、PVC

5, PVC trough wall rough

① screw speed too fast. Should reduce the screw speed.

② barrel temperature is low. Should be appropriate to improve the barrel temperature.

③ high moisture content and volatile materials. Should clean up the pipeline, improve the exhaust vacuum.

6, white PVC trunking discoloration

① quality of titanium dioxide failed. Should be qualified qualified rutile titanium dioxide.

② group of green caused discoloration. Application of the import of acid-treated ultramarine to prevent sulfur pollution.

③ lead, cadmium as a stabilizer of the trough and sulfide contact with sulfur pollution. Formed by the lead, cadmium and other metal ion coating agent, chelating agent.

④PVC stabilizer poor quality, less stable amount of stabilizer. Should use good quality PVC resin and stability together, the amount of stabilizer is higher than the lower limit.