Molds & Tooling
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Crystalline Layer Formation During Low-Speed Filling of PBT
Problem Phenomenon
During filling, the surface layer has crystallized, forming a highly oriented skin layer, affecting product performance.
Cause Analysis
PBT crystallizes quickly; during low-speed filling, the surface layer contacts the mold wall and cools and crystallizes rapidly, forming an anisotropic skin layer.
Solution
Increase the injection speed and shorten the filling time to reduce the skin layer thickness; increase the mold temperature to delay surface crystallization.
Key Takeaway
The PBT skin layer thickness can be controlled by the filling speed.
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