Injection Molding
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HIPS '2079851475616104452 Color Mixing
Problem Phenomenon
Old color remains in the product for a long time after color change.
Cause Analysis
Material hides in dead corners of the barrel and hot runner; HIPS is often dark-colored, and the problem is prominent when changing to light colors.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Fully replace with purging material; ②arrange production order from light to dark; ③clean the hot runner; ④disassemble and clean when necessary.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Color change management relies on process and sequencing; stubborn residues require mechanical cleaning.; 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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