Extrusion & Post
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PVC Profile Uneven Cooling Deformation
Problem Phenomenon
Profile bends after exiting calibration die, poor straightness.
Cause Analysis
Uneven cooling, calibration die wear, haul-off skew; inconsistent cooling of profile parts produces bending stress; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Evenly arrange cooling water channels to ensure consistent cooling of all parts; ②Overhaul calibration die wear and water channels; ③Correct haul-off straightness to ensure profile not bent; ④Optimize wall thickness distribution to reduce wall thickness sudden changes; ⑤Stabilize extrusion output and pressure.
Key Takeaway
PVC profile bending = 'cooling and haul-off straightness': uniform cooling and straight haul-off are the two elements; calibration die condition directly determines profile straightness; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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