Material Drying
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Selection and Verification of PA12 Drying Parameters
Problem Phenomenon
【Problem phenomenon】Different sources give different parameters such as 85℃×4-5h, 80℃×6-16h, and 90-100℃×4-10h, causing execution confusion
Cause Analysis
The parameter differences among sources stem from different drying methods (hot air/dehumidification/vacuum) and grade requirements: Viewmold recommends 85℃ hot air for 4-5h or dehumidification for 3-4h, EMS specifies 80℃×6-16h, and TR90 specifies 90-100℃×4-10h; the common goal is moisture content below 0.1%
Solution
Select parameters based on the data sheet of the grade used; take the lower time limit for dehumidifying dryers and the upper limit for ordinary ovens; use a moisture meter to actually measure and verify the drying endpoint rather than relying only on timing
Key Takeaway
Drying parameters follow the grade data sheet, and actual measurement by a moisture meter is the final referee; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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