Material Drying
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PA6 Rotational Molding
Problem Phenomenon
Rotomolded PA6 products have uneven wall thickness, internal bubbles, and insufficient strength at corners
Cause Analysis
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
Solution
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
Key Takeaway
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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