Molds & Tooling
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POM hot runner color change difficulty
Problem Phenomenon
Old color material still seeps out for a long time after color change, especially obvious when changing from dark to light colors, with a high scrap rate.
Cause Analysis
Dead corners and hanging material exist in the hot runner channels, and old color material is retained and slowly released; POM's wall adhesion makes cleaning more time-consuming than general-purpose materials.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Select a streamlined, dead-corner-free valve gate hot runner; ②purge with cleaning compound for multiple rounds; ③reasonably arrange production order from light to dark; ④increase temperature to strengthen cleaning if necessary.
Key Takeaway
Color change efficiency depends on the hot runner structure; dead-corner-free design and production sequencing management can greatly reduce color change scrap and time.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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