Material Drying
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PA66 coloring masterbatch selection
Problem Phenomenon
Color streaks appear after adding color powder to natural-color material, batch-to-batch color difference exceeds standard, especially obvious on light-color parts
Cause Analysis
Color powder disperses unevenly in PA66 low-viscosity melt forming color streaks; batch fluctuations of drying and melt temperature change the matrix hue, and light-color parts are more sensitive to color difference; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
①Switch to carrier-matched color masterbatch to improve dispersion; ②Lock drying and melt temperature parameters; ③First-article color comparison to establish color difference acceptance standards; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
PA66 coloring prioritizes the color masterbatch route; parameter locking and first-article color comparison system keep color difference stable within the acceptance band; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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