Injection Molding
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PA6 Nozzle Drooling Treatment
Problem Phenomenon
PA6 low-viscosity melt drools from the nozzle during the mold opening interval, wasting material and easily causing burns
Cause Analysis
PA6 melt viscosity is low, and the residual pressure in the barrel and the melt's own weight cause the melt to continuously flow out when the nozzle is open, and untimely retraction of the injection unit aggravates drooling; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Adopt an anti-drooling needle valve nozzle or spring self-closing nozzle; set screw decompression suck-back of 3-5mm in the process to reduce residual pressure; take the lower limit for nozzle temperature; clean drooled material in time to prevent carbonization and mixing in
Key Takeaway
Low-viscosity PA6 drooling must be treated by a combination of nozzle structure and suck-back process; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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