Molds & Tooling
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PP Hot Runner Temperature
Problem Phenomenon
[Problem Phenomenon] PP hot runner gate defects; improper temperature control
Cause Analysis
Hot runner temperature matched with the barrel at 220-260°C; local overheating degrades and low temperature causes cold material; PP's good fluidity makes gates prone to drooling; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Hot runner 220-260°C zoned closed-loop; gate drool prevention; regularly check thermocouples; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP hot runner 220-260°C; drool prevention is the focus; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar future problems
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