Molds & Tooling
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PA66 suck-back anti-drool setting
Problem Phenomenon
PA66 melt flows intermittently from the nozzle between molding cycles, contaminating the mold parting line
Cause Analysis
PA66 melt viscosity is low and fluidity good, barrel residual pressure pushes melt out of the nozzle, drooled material oxidizes and mixes into products forming defects; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Set suck-back pull 3-5mm to release pressure; nozzle uses needle valve self-locking type; drooled material cleaned promptly, must not remain on the parting line; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Low-viscosity melt anti-drool relies on suck-back plus self-locking nozzle combination; 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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