Molds & Tooling
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TPU product warpage
Fenómeno del problema
The product warps and deforms after demolding.
Análisis de la causa
Uneven cooling or improper holding pressure causes inconsistent shrinkage; the large elasticity of TPU and stress release after demolding also cause deformation; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①balance the cooling system; ②optimize the holding pressure curve; ③extend cooling and sizing; ④adjust the gate position; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
TPU warpage should be addressed from cooling and holding pressure; elastomer deformation is also affected by stress release after demolding; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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