Material Drying
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PA6 Glass Fiber Grades Still Need Drying
Fenómeno del problema
Believing that glass-fiber reinforced PA6 absorbs little water and omitting drying, the products still show silver streaks and bubbles
Análisis de la causa
Glass fiber can only reduce rather than eliminate moisture absorption; 30% glass-fiber PA6 still has an equilibrium water absorption of about 1.5%; and after the fiber-matrix interface absorbs water, the bonding force decreases, and hydrolysis damage is likewise irreversible
Solución
①Glass-fiber reinforced grades follow the same drying procedure as neat resin; ②the moisture content is still controlled below 0.2%; ③do not relax the drying standards on the grounds of reinforcement; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
That reinforcement does not change the hygroscopic nature is a common misconception about PA6; the drying procedure treats all PA6 grades equally, and interface hydrolysis is only more hidden; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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