Molds & Tooling
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PA66 nozzle drool self-locking
Problem Phenomenon
Nozzle drool stringing contaminates the mold surface, products show cold slug marks, production forced into frequent cleaning
Cause Analysis
PA66 melt viscosity is low; with an open nozzle, melt drools under its own weight during plasticizing back and mold opening gaps; drooled material oxidizes and enters the cavity forming cold slug marks and black specks
Solution
①Select self-locking (needle valve) nozzles to prevent drool; ②nozzle temperature slightly lower than the barrel front section; ③add anti-drool delayed plasticizing-back program if necessary; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PA66 processing comes standard with self-locking nozzles; eradicating drool from the hardware is more thorough and reliable than any process compensation; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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