Processing Machinery
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PBT Fast Molding Advantage
Problem Phenomenon
PBT's molding cycle is shorter than PA, but there are complaints of bending deformation of products with uneven cooling
Cause Analysis
PBT crystallizes fast with short cooling time, and its low viscosity gives a short molding cycle; but fast crystallization makes the uneven cooling problem more sensitive, and the risk of bending deformation follows; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Give play to the fast crystallization advantage to keep the cycle; ②Design cooling channels uniformly to prevent bending; ③Pay special attention to cooling balance for thin-walled parts; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT's fast molding is an efficiency advantage; cooling uniformity design is the prerequisite for enjoying this advantage; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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