Molding Process
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PTFE Warpage and Distortion
Fenómeno del problema
PTFE parts bend and distort after sintering or cooling, assembly misaligns, and alignment of critical mechanical systems fails.
Análisis de la causa
Uneven heating or cooling during sintering generates thermal gradients; PTFE sintering shrinkage is 15~20% and differential shrinkage is aggravated at uneven wall thickness; uneven molding pressure generates stress concentration.
Solución
①Controlled uniform heating and slow gradual cooling; ②Mold design with consistent wall thickness to reduce differential shrinkage; ③Set stress relief structures or anneal after sintering; ④Uniform molding pressure.
Conclusión clave
Thermal management and wall thickness design are equally important for PTFE warpage; 15~20% sintering shrinkage is the baseline data for process design; annealing is an effective post-treatment means.
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