Production & Quality
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Narrow processing window of high heat resistant ABS
Fenómeno do problema
When heat-resistant grade ABS is produced with ordinary ABS process, it yellows, becomes brittle, or fills poorly, and the quality is unstable.
Análise das causas
Heat-resistant ABS has a high heat deflection temperature but the processing temperature is also closer to the degradation temperature, so the temperature window is narrow; applying the general process results in either overheating degradation or under-plasticization, and dedicated process parameters are needed.
Solução
①Set the melt temperature according to the grade data (generally 10~20℃ higher than the general grade); ②shorten the residence time; ③increase the mold temperature to improve flow and stress; ④obtain the processing window from the material supplier and strictly implement it; ⑤strengthen process monitoring.
Conclusão principal
Special ABS must follow the grade's dedicated process: applying the general process to heat-resistant material results in either yellowing or brittleness; for narrow-window materials, temperature control precision and residence time must be managed even more strictly.
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