Processing Machinery
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PA6 Melt Temperature Actual Measurement
Problem Phenomenon
The barrel temperature is set at 260°C but the actual products behave as if the temperature is low, with difficult filling
Cause Analysis
The temperature controller displays the barrel wall temperature rather than the actual melt temperature; thermocouple position, heater band aging, and differences in screw shear heat generation all cause the actual melt temperature to deviate from the set value
Solution
Use a melt thermometer to actually measure the temperature of the extruded strand: catch the material from an air shot and insert the probe to measure, and calibrate the temperature control system when the deviation between the measured value and the set value exceeds 10°C; take the actual measured melt temperature as the process benchmark
Key Takeaway
The set temperature does not equal the actual melt temperature, and regular actual measurement is the guarantee of process accuracy; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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