Molds & Tooling
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PBT Mold Deposit from Small Molecules
Problem Phenomenon
In continuous production of glass fiber reinforced PBT, mold deposit accumulates quickly, requiring frequent shutdowns for mold cleaning, resulting in low efficiency
Cause Analysis
The residual rate of PBT oligomers and small molecules is usually 1-3%, higher than other materials and prone to mold deposit; it is more obvious after introducing glass fiber; small-molecule additives and thermal degradation products jointly aggravate it
Solution
①Reduce the amount of small-molecule additives and select high-molecular additives; ②Improve thermal stability to reduce degradation small molecules; ③Establish a regular mold cleaning and maintenance plan; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT mold deposit is a direct reflection of small-molecule content; making additives high-molecular and thermal stabilization reduce it from the source; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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