Molds & Tooling
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Crystalline Layer Formation During Low-Speed Filling of PBT
Fenómeno del problema
During filling, the surface layer has crystallized, forming a highly oriented skin layer, affecting product performance.
Análisis de la causa
PBT crystallizes quickly; during low-speed filling, the surface layer contacts the mold wall and cools and crystallizes rapidly, forming an anisotropic skin layer.
Solución
Increase the injection speed and shorten the filling time to reduce the skin layer thickness; increase the mold temperature to delay surface crystallization.
Conclusión clave
The PBT skin layer thickness can be controlled by the filling speed.
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