Injection Molding
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PP Glass Fiber Floating Fiber
Problembeschreibung
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.
Ursachenanalyse
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.
Lösung
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.
Wichtigste Erkenntnis
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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