Extrusion & Post
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PBT Surface Peeling
Problem Phenomenon
The product surface peels in layers, strength is unqualified, and the peel test shows poor interlayer bonding
Cause Analysis
PBT surface peeling is mostly caused by contamination with heterogeneous materials or mixing in of regrind with poor compatibility; too low melt temperature and uneven plasticization also cause delamination; poor bonding between glass fiber and matrix aggravates it
Solution
①Investigate raw material contamination and regrind management; ②Increase melt temperature to ensure plasticization; ③Verify after barrel cleaning; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The number one suspect of PBT surface peeling is contamination; regrind management and barrel cleanliness are the defense line; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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