Injection Molding
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PA12 High-speed Injection and Glass Fiber Surface
Problem Phenomenon
【Problem phenomenon】Glass fiber reinforced PA12 products had floating fibers and rough surfaces, and the appearance was not up to standard
Cause Analysis
High-speed injection can improve the surface quality of glass fiber filled PA12: rapid filling makes the fibers embed below the surface layer with the melt; at low speed, fibers easily concentrate on the surface and form floating fibers
Solution
Use high-speed injection for glass fiber grades to improve the surface; cooperate with a high mold temperature of 90-100℃ to improve fiber coating; design the gate to avoid fiber orientation concentration and exposure; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Glass fiber PA12 requires high-speed injection to press down floating fibers, with high mold temperature assisting coating; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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