Material Drying
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PA66 glass fiber drying not exempted
Problem Phenomenon
Believing that glass fiber reinforced PA66 absorbs less water and relaxing drying, products still have silver streaks and bubbles
Cause Analysis
Glass fiber can only reduce but not eliminate moisture absorption, and reinforced-grade equilibrium water absorption is still considerable; after the fiber-matrix interface absorbs water, bonding force decreases, and hydrolysis damage is equally irreversible and more hidden
Solution
①Reinforced grades follow the same drying procedure as pure material; ②Moisture content is still controlled below 0.2%; ③Interface damage is monitored by impact sampling inspection; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Reinforcement does not change PA66's moisture absorption nature; drying procedures treat all grades equally, and interface hydrolysis is backed up by mechanical sampling inspection; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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