Processing Machinery
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GPPS Product Black Specks
Problem Phenomenon
Black speck impurities appear in the product.
Cause Analysis
Material retained at barrel dead corners carbonizes and falls off; raw material or regrind contamination also brings them in.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
①Thoroughly clean the barrel; ②standardize the material change process; ③strengthen raw material management; ④check hot runner dead corners.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Black specks point to equipment cleaning and material management; regular purging is a preventive system.; 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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