Injection Molding
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Floating fibers of glass fiber reinforced PP
Problem Phenomenon
Glass fiber texture is visible on the product surface and even fibers are exposed; the surface is still uneven after spraying.
Cause Analysis
The melt temperature or mold temperature is low, and the surface resin solidifies before fully covering the fibers; slow injection speed and insufficient holding pressure bring the fibers close to the surface.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Appropriately increase the melt and mold temperatures; ②increase the injection speed; ③strengthen holding pressure to make the surface layer dense; ④polish the cavity to improve replication.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
Floating fibers affect appearance and coating adhesion; increasing temperature and speed to improve surface covering ability is a general countermeasure.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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