Injection Molding
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PBT surface floating fibers
Problem Phenomenon
Glass fiber texture visible on the surface of reinforced PBT products, poor gloss.
Cause Analysis
Low melt temperature or mold temperature causes the surface resin to not fully coat the fibers; slow injection speed and insufficient holding pressure make fibers close to the surface.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Appropriately increase melt and mold temperature; ②increase injection speed; ③strengthen holding pressure; ④polish the cavity to improve replication.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Floating fibers affect appearance and coating; increasing temperature and speed to improve coating ability is the universal countermeasure.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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