Material Drying
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TPU Polyester vs Polyether Selection
Fenómeno del problema
Polyester TPU used in a humid-hot environment hydrolyzes and cracks
Análisis de la causa
Polyester type has poor hydrolysis resistance; ester bonds break in a humid-hot environment; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solución
Choose polyether type for humid-hot environments; choose polyester type for dry-hot mechanical environments; select according to the environment; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Conclusión clave
Polyester and polyether are selected according to the humid-hot environment; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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