Material Drying
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PA6 Glass Fiber Grades Still Need Drying
Problem Phenomenon
Believing that glass-fiber reinforced PA6 absorbs little water and omitting drying, the products still show silver streaks and bubbles
Cause Analysis
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
Solution
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
Key Takeaway
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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