Introduction
PVC hollow wall panels are widely used in construction, interior decoration, partition and packaging industries. Uniform board thickness is one of the key quality indicators of finished panels. Uneven thickness will lead to panel warpage, poor assembly and high product rejection rate.
Main Factors Affecting PVC Hollow Panel Thickness
- Extruder Screw & Barrel Temperature Temperature directly affects PVC melt fluidity. Too high temperature makes the melt too thin, easy to cause thin wall. Too low temperature leads to poor plasticization, unstable material output and thickness fluctuation. Keep each zone temperature according to your PVC formula.
- Feeding System Consistency Unstable feeding volume causes uneven melt supply. Check the feeding hopper, feeder and raw material mixing uniformity regularly. Ensure steady material input to the extruder.
- Die Head Gap Adjustment The die head determines the initial shape of PVC hollow panels. Adjust die lip gap carefully. Clean die deposits regularly, accumulated carbon will change flow distribution and result in local thickness difference.
- Calibration & Cooling Tank The vacuum calibration sleeve is critical for shaping and thickness control. Improper vacuum degree will pull or squeeze the profile. Insufficient cooling causes panel deformation after leaving the tank, changing final thickness.
- Haul-off Speed Haul-off speed must match extrusion output. Faster pulling makes panels thinner; slower speed leads to thicker boards. Keep stable hauling speed during continuous running.
Practical Operation Tips for Thickness Control
- Check thickness at fixed intervals with calipers, record data and adjust parameters timely.
- Keep PVC compound formula stable. Changing additives or filler ratio will affect melt performance.
- Maintain the extrusion line regularly: screw wear, seal leakage will bring long-term thickness problems.
- Train operators to monitor melt pressure, temperature and vacuum value in real time.
Conclusion
Stable thickness of PVC hollow wall panels depends on matched extrusion equipment, reasonable parameter setting and standardized operation. Qingdao JBD Machinery supplies complete PVC hollow panel extrusion lines. Our technical team can provide on-site guidance for production debugging.
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