Processing Machinery
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Poor PET colorant dispersion
Problem Phenomenon
Colored bottles show color specks, color streaks, and color difference, and the same color masterbatch behaves differently in different batches, with problems concentrated in color masterbatches of poor dispersibility.
Cause Analysis
The color masterbatch carrier has poor compatibility with PET or the pigment particle size is large, so it cannot be fully dispersed during plasticizing; unstable metering addition also causes batch color difference.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Select PET-specific high-dispersion color masterbatch; ②optimize the plasticizing back pressure to promote dispersion; ③stabilize the metering addition of color masterbatch; ④perform color difference testing by batch.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Coloring quality depends on the dispersibility of the color masterbatch and the stability of metering; optical appearance products should use special color masterbatch and establish color difference control standards.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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