Material Drying
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PA6 Rotational Molding
Fenómeno del problema
Rotomolded PA6 products have uneven wall thickness, internal bubbles, and insufficient strength at corners
Análisis de la causa
Rotational molding relies on powder melting and self-leveling; PA6 has a high melting point and low melt strength, with insufficient accumulation at corners; moisture in the powder vaporizes during long-time heating, forming internal bubbles
Solución
①Strictly control the moisture content of rotomolding-specific powder; ②enlarge the fillets at mold corners to improve material flow; ③optimize the heating curve according to the melting point peak; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
PA6 rotational molding is sensitive to powder state and mold geometry; fillet design and powder drying are the keys to eliminating corner defects and internal bubbles; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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