Molds & Tooling
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PC barrel cleaning and material changeover
Problem Phenomenon
【Problem Phenomenon】Black specks and mixed colors after PC material and color changeover, incomplete cleaning
Cause Analysis
PC material changeover requires thorough cleaning of the barrel and hot runner; PC-specific purging compound or HDPE can be used; dark-to-light changeover doubled; high-temperature material cleaning must be thorough；During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Use purging compound or HDPE for thorough replacement during changeover; dark-to-light doubled; hot runner synchronized；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability；Change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PC changeover requires thorough cleaning, dead corners of high-temperature material must be cleaned；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence；Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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