Injection Molding
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Glass fiber reinforced ABS floating fiber
Problem Phenomenon
The surface of GF-ABS products is rough and mottled, with glass fiber filamentous lines visible, more obvious after painting.
Cause Analysis
The glass fibers tumble to the surface with the melt front and are not coated by the resin; low melt/mold temperature and too fast injection speed aggravate the floating fiber; fiber enrichment to the surface and orientation disorder are the essence.
Solution
①Increase the melt temperature and mold temperature to improve coating; ②reduce the injection speed; ③enlarge the gate to reduce shear; ④do surface texturing to cover or post-treat when necessary; ⑤select reinforced grades with better coating.
Key Takeaway
GF-ABS floating fiber relies on 'temperature coating': heating up and slowing down lets the resin wrap the fibers; GF parts with high appearance requirements need process, texture, and grade cooperation, and are difficult to eradicate by machine adjustment alone.
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