Thermoforming
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Stress Whitening at the Corners of PCTG Sheet Thermoformed Parts
Problem Phenomenon
Whitening appears at the corners or bends of thermoformed products.
Cause Analysis
The material is excessively stressed at the corners, producing microcracks/cavities that scatter light and whiten, and the R angle is too small.
Solution
Increase the R angle ≥2mm; increase the sheet heating temperature; optimize the mold design to avoid excessive stretching.
Key Takeaway
PCTG stress whitening is a manifestation of local excessive deformation.
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