Injection Molding
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PVC Nozzle Large Orifice
Problem Phenomenon
Frequent nozzle clogging, injection pressure fluctuation, and products show cold material and burnt coexisting
Cause Analysis
PVC's high viscosity requires a large-orifice nozzle to reduce shear; the nozzle orifice should be more than 30% larger than standard; small-orifice nozzles concentrate shear heat, and degradation and clogging occur alternately
Solution
①Enlarge the nozzle orifice by more than 30%; ②independently and precisely control nozzle temperature; ③regularly check carbon deposits in the nozzle cavity; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The large-orifice nozzle is a key detail for PVC shear prevention; the 30% enlargement margin is written into the equipment specification; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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