Material Drying
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PA6 Regrind Secondary Drying
Problem Phenomenon
PA6 products blended with 30% regrind show bubbles and decreased strength
Cause Analysis
Regrind stored in the environment absorbs moisture severely and has undergone multiple thermal histories; its moisture content is much higher than that of virgin material, and after blending with virgin material the overall moisture exceeds the standard, and thermal degradation is also more obvious
Solution
Regrind is dried separately with the drying time extended by 1-2 hours, and the blending ratio is controlled within 30%; regrind is used as soon as possible after grinding and stored sealed against moisture
Key Takeaway
Both the moisture and thermal history of regrind are risks; separate drying plus limited blending is the control key point; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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