Processing Machinery
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PPO Melt Discoloration After 2 Hours Residence
Fenómeno del problema
【Problem Phenomenon】After PPO production is interrupted and then restarted, products discolor and performance is abnormal
Análisis de la causa
PPO melt cannot be retained at high temperature for a long time; it discolors after residing in the barrel for more than 2 hours, and at this point the entire barrel should be cleaned; lack of interruption management causes degraded material to mix in
Solución
If interrupted for more than 2 hours, thoroughly clean the barrel; scrap the first several mold shots after restart; for short interruptions, cool down and keep warm according to the shutdown grading procedure; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
PPO melt residence of 2 hours is the discoloration line; over time, clean the machine and scrap the first shots at restart; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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