Injection Molding
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Severe mold deposit of PBT injection molded parts
Problem Phenomenon
White or yellow deposits (mold deposit) appear on the mold surface after a period of PBT '2079851475616104452.
Cause Analysis
Low molecular oligomers and additives in PBT migrate to the mold surface and deposit at high temperature; impurities accumulate in the recycled material.
Solution
Clean the mold regularly; reduce the processing temperature; select PBT grades with low oligomers; use anti-mold-deposit additives.
Key Takeaway
PBT mold deposit is the result of additive and oligomer migration.
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