Thermoforming
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PETG thermoformed product folded corner whitening
Fenómeno do problema
Stress whitening appears at the folded corners or bent parts of PETG thermoformed products.
Análise das causas
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.
Solução
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.
Conclusão principal
PETG stress whitening is related to local excessive deformation; improving the design is fundamental.
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