Material Drying
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PA6 Water Absorption Dimensional Change
Fenómeno do problema
PA6 precision parts have qualified dimensions at assembly, but the fit becomes loose after several weeks of storage
Análise das causas
PA6 absorbs moisture and swells after absorbing water, and dimensions change with ambient humidity; dry-state products without conditioning treatment absorb moisture and swell in service, and precision fit dimensions drift; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solução
After molding, precision parts are conditioned according to ISO1110 until dimensionally stable before inspection; reserve moisture expansion allowance in design; switch to low-moisture-absorption materials when dimensional stability requirements are high
Conclusão principal
PA6 dimension management must consider moisture expansion, and inspection is only valid after conditioning; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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