Molds & Tooling
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PCABS Color and Material Change Cleaning
Problem Phenomenon
[Problem Phenomenon] After PC/ABS color and material change, black specks and mixed colors appear, and the cleaning is not thorough
Cause Analysis
Color and material changes must thoroughly clean the barrel and hot runner; PC/ABS can use PS or special purging material; changing from dark to light colors especially needs to be thorough; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
For color change, use PS or purging material to thoroughly displace; double the cleaning when changing from dark to light colors; clean the hot runner synchronously; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
For PC/ABS color change, clean thoroughly, and double the cleaning when changing from dark to light; 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 similar problems in the future
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