Material Analysis
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PBT Floating Fiber Causes
Problem Phenomenon
The surface of glass fiber reinforced PBT products has floating fibers and is rough, and the fiber texture appears after painting
Cause Analysis
PBT has poor compatibility with glass fiber and insufficient bonding; the large viscosity difference between the two causes separation during flow; shear force destroys the interface layer on the glass fiber surface, and the lower the viscosity, the easier the glass fibers break free from restraint and accumulate toward the surface
Solution
①Increase injection temperature and mold temperature, increase injection pressure and back pressure; ②Speed up injection speed and reduce screw rotation speed; ③Add compatibilizer on the material side to improve bonding; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Floating fiber is the superposition of three factors: compatibility, viscosity difference, and shear; combining process adjustment with compatibilizer works best; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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