Molds & Tooling
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PPO Screw Speed and Back Pressure
Problem Phenomenon
【Problem Phenomenon】PPO plasticizing shear heat is too large or venting is poor, and melt state is abnormal
Cause Analysis
SABIC recommends screw linear speed 0.1-0.3m/s and back pressure 30-70bar; GTX974 data gives medium speed equivalent to 0.6m/s and back pressure 3-10MPa (30-100bar); exceeding limits causes both shear heat and plasticizing problems
Solution
Set screw linear speed at 0.1-0.3m/s; back pressure 30-70bar is enough to expel volatiles; when speed is too high, reduce speed and increase external heat for compensation; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO screw 0.1-0.3m/s with back pressure 30-70bar; high shear is not worth the cost; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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