Molds & Tooling
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ABS material changeover cleaning
Problem Phenomenon
[Problem phenomenon] Black specks and mixed colors after ABS material or color change, incomplete cleaning
Cause Analysis
Material and color changes must thoroughly clean the barrel and hot runner; ABS can be displaced with PS or special purging compound; dark to light color change requires doubled cleaning; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
Use PS or purging compound for thorough displacement during color change; double for dark to light; clean the hot runner synchronously; after adjustment, continuously sample 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
ABS material changeover thoroughly cleaned, dark to light doubled; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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