Processing Machinery
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LDPE Film Color Change Cleaning
Problem Phenomenon
After color change, old color streaks remain on the film surface for a long time.
Cause Analysis
Old color material remaining in screw and die dead spots is slowly released; improper use of purging compound or insufficient purging time.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Fully purge with purging compound; ②Raise temperature to strengthen purging when necessary; ③Arrange production order from dark to light colors; ④Disassemble and clean die dead spots.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Color change efficiency relies on the purging process and production sequencing; stubborn residue requires disassembly and cleaning.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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