Molds & Tooling
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PPO High-Tg Grade Processing Difficulty
Problem Phenomenon
When processing PPO high glass transition temperature grades, filling and plasticizing difficulties intensify, conventional process parameters cannot meet requirements, and the defect rate remains high.
Cause Analysis
High-Tg grades have higher melt viscosity and poorer flowability; processing temperature requirements approach the upper limit of equipment capability; the temperature window is further narrowed; requirements for equipment and molds are raised simultaneously.
Solution
①Increase processing temperature and pressure according to the grade manual; ②conduct a special assessment of equipment capability; ③optimize and enlarge mold runners and gates; ④switch to modified easy-processing grades if necessary.
Key Takeaway
Processing PPO high-Tg grades is an extreme challenge for equipment and process; grade replacement is more economical than forcing the process; early assessment avoids ineffective investment.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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