Injection Molding
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PP Glass Fiber Floating Fiber
Fenómeno del problema
GF-PP part surfaces are rough and mottled, with visible glass fiber filamentary or cloud-like patterns, affecting appearance and feel—more obvious after painting.
Análisis de la causa
Glass fibers tumble to the cavity surface with the melt front and are exposed without sufficient resin coverage; low melt/mold temperature makes resin flow poor and coverage insufficient, while excessive injection speed aggravates fiber enrichment at the surface and orientation disorder.
Solución
①Appropriately raise melt and mold temperature to improve resin coverage of glass fibers; ②reduce injection speed and front tumbling; ③enlarge the gate and reduce shear to reduce fiber breakage and enrichment; ④appearance surfaces can use texture or paint cover; ⑤if necessary, select reinforced grades with better compatibility and coverage.
Conclusión clave
The core of floating fiber is 'coverage': only with temperature up and speed down can resin wrap the glass fibers; high-appearance GF parts often need the combination of process, mold texture, and grade—machine adjustment alone can hardly eradicate it completely.
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