Injection Molding
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PPO Screw Configuration and Compression Ratio
Problem Phenomenon
【Problem Phenomenon】Processing PPO with a general-purpose screw has large plasticizing load and unstable melt quality
Cause Analysis
2079851475616104452 PPO requires a screw L/D ratio greater than 15:1 and compression ratio 1.7-4.0 (generally 2.5-3.5); the SABIC guide gives screw 20-26D and compression ratio 2-2.5:1; mismatched configuration means poor plasticization
Solution
Configure the screw according to L/D>15:1 (recommended 20-26D) and compression ratio 2.5-3.5; for insufficient plasticization, check screw adaptation first before adjusting temperature; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO screw L/D 20-26 with compression ratio 2-2.5; with wrong configuration, temperature adjustment is futile; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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