Molds & Tooling
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PSU Nozzle Drool and Cold Slug
Problem Phenomenon
In PSU processing, nozzle drool and cold slug blockage alternate; gate defects on products occur frequently; production continuity is poor.
Cause Analysis
PSU melt has high viscosity and generally does not drool, but it still can when nozzle temperature is out of control; the nozzle orifice must be larger than 5mm with a heated temperature-controlled extended nozzle; improper temperature causes cold slug blockage.
Solution
①Select an extended nozzle equipped with a heating and temperature control device; ②Nozzle orifice larger than 5mm; ③Precisely control nozzle temperature; ④Regularly inspect the nozzle heating system.
Key Takeaway
The high-viscosity characteristic of PSU allows large-orifice nozzle design; extended heated nozzles are standard; fine temperature management avoids both extremes.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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