Molds & Tooling
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Cautious Use of Hot Runners for PPS
Problem Phenomenon
In PPS hot runner systems, melt retention degrades, and gate blockage and discoloration occur frequently
Cause Analysis
PPS can use hot runners but requires precise temperature control and wear-resistant gate tips; valve-gate type is not recommended for glass fiber filled grades, as fibers easily jam the valve; retention degradation is the main risk
Solution
①Use valve-gate hot runners cautiously for glass fiber PPS; ②Select wear-resistant material for gate tips; ③Hot runner temperature control accuracy ±3°C; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS hot runners are usable but conditional; the valve-gate prohibition for glass fiber grades and temperature control accuracy are two disciplines; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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