Thermoforming
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PETG thermoformed product folded corner whitening
Problem Phenomenon
Stress whitening appears at the folded corners or bent parts of PETG thermoformed products.
Cause Analysis
Excessive bending stress at the folded corner and molecular chain orientation produce microcracks causing light scattering whitening, and the folded corner R angle is too small.
Solution
Increase the folded corner R angle to ≥2mm; increase the sheet heating temperature to make it softer; optimize the forming mold to avoid local excessive stretching.
Key Takeaway
PETG stress whitening is related to local excessive deformation; improving the design is fundamental.
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