Thermoforming
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PVC '2079851475616104458 Warpage
Problem Phenomenon
Products bend and twist after cooling, assembly uneven.
Cause Analysis
Uneven cooling of upper and lower surfaces produces residual stress; taken out too early before setting; PVC thermoformed parts are sensitive to cooling symmetry; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solution
①Balance two-side cooling (back air cooling + in-mold water cooling); ②Extend setting time; ③Cooling and setting fixture constraint; ④Optimize wall thickness uniformity to reduce differential shrinkage; ⑤Optimize demolding timing.
Key Takeaway
PVC '2079851475616104458 warpage = 'cooling symmetry': two-side cooling must be balanced, setting must be sufficient; part removal timing and cooling balance are the two factors determining flatness.
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