Processing Machinery
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ASA melt temperature measurement deviation
Problem Phenomenon
ASA product color and performance fluctuate, barrel set temperature is normal but measured melt temperature exceeds the standard, process baseline is distorted.
Cause Analysis
ASA melt temperature must be measured by a pyrometer through the air-shot method; deviations exist between barrel setting and measurement; nozzle, front, middle and rear section temperature gradient influence; heating system aging; non-standard temperature measurement methods.
Solution
①Melt temperature 240-280°C measured by air-shot method; ②nozzle 240-280°C, front section 235-270°C, middle section 225-245°C, rear section 215-225°C settings; ③pyrometer calibration; ④temperature gradient verification.
Key Takeaway
ASA melt temperature measurement is the only process baseline; the air-shot method is the standard method; gradient management prevents local overheating.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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