Processing Machinery
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ABS screw speed and butadiene
Fenómeno do problema
[Problem phenomenon] ABS screw high-speed shearing, impact strength decline and products become brittle
Análise das causas
High speed shear heat and mechanical shear damage the butadiene rubber phase, and the core of ABS impact strength is damaged; 40-70rpm medium speed protects the rubber phase; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solução
Screw speed controlled at 40-70rpm; increase external heat if plasticization is insufficient; check speed first upon impact decline; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
ABS screw high speed destroys butadiene, and impact strength falls accordingly; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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