Injection Molding
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Black Stripes in PBT Reinforced Material '2079851475616104452
Problem Phenomenon
Black or brown stripes appear in PBT reinforced products.
Cause Analysis
The glass fiber wears in the screw, producing iron filings, or the metal fine powder produced by the wear of the barrel and screw degrades to form black stripes; the material degrades.
Solution
Use a bimetallic wear-resistant screw and barrel; check the wear of the screw and barrel; reduce the processing temperature.
Key Takeaway
PBT reinforced material black stripes are mostly related to equipment wear and degradation.
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