Processing Machinery
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PSU Nozzle Selection and Heating
Problem Phenomenon
[Problem Phenomenon] Cold slug blockage or temperature fluctuation at the PSU nozzle; defects frequently occur in the front section of filling
Cause Analysis
PSU should use an extended nozzle with a heating and temperature control device, with orifice larger than 5mm; high-viscosity melt will not drool; large orifice reduces resistance and the extended type prevents cold slugs; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based solely on experience
Solution
Equip extended heated nozzle with orifice >5mm; independent nozzle temperature control matched with the front section; for cold slug problems, check nozzle heating and temperature setting; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU nozzles need extended heating and large orifice; >5mm does not drool but instead prevents blockage; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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