Material Drying
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ABS drying 0.02% red line
Fenómeno del problema
ABS products have silver streaks, bubbles, and pinholes; performance decreases; traced to insufficient drying and excessive moisture content.
Análisis de la causa
ABS is a hygroscopic material, and water vaporizes in the 230-270℃ melt; 0.02% residual moisture causes silver streak surface defects and weakening of molecular bonds; insufficient drying is the most common defect source of ABS.
Solución
①Dehumidifying dryer 80℃×3-4 hours; ②moisture content <0.02% verification; ③avoid excessive drying >6 hours causing oxidative yellowing; ④sealed storage to prevent moisture regain.
Conclusión clave
The 0.02% red line and 3-4 hours of ABS drying are the standard; excessive drying oxidation is the other extreme; verification and storage prevent recurrence.；after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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