Injection Molding
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PSU Multi-stage Injection Air Entrapment
Problem Phenomenon
When PSU is injected at high speed and high pressure, air entrapment burning appears at weld junctions; reducing speed causes insufficient filling; the process contradiction is prominent.
Cause Analysis
The high-speed high-pressure injection method easily traps gas at melt junctions; multi-stage injection can prevent air entrapment at junctions; venting design and injection profile are improperly matched.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based solely on experience
Solution
①Adopt multi-stage injection to prevent air entrapment at junctions; ②Strengthen venting design at junctions; ③Decelerate at the final stage of the injection profile; ④Vacuum venting assistance.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU high-speed process must be paired with multi-stage control; air entrapment treatment emphasizes both venting and profile; junctions are the key areas of concern.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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