Processing Machinery
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HDPE film uneven color masterbatch dispersion
Problem Phenomenon
Color difference and color streaks appear in the colored film, and the performance differs after changing the color masterbatch batch.
Cause Analysis
Poor compatibility between the color masterbatch and the base material or unstable dosing metering; insufficient plasticization and mixing make the color masterbatch not fully dispersed.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Select a special color masterbatch with good compatibility; ②optimize screw mixing; ③stabilize metering and addition; ④perform color difference testing by batch.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Coloring uniformity is guaranteed by both color masterbatch quality and mixing process; color difference testing should be incorporated into routine quality inspection.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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