Processing Machinery
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ASA temperature fluctuation dimensional instability
Fenómeno do problema
ASA product dimensions drift between batches, assembly fit is sometimes loose and sometimes tight, shrinkage rate fluctuates with ambient temperature and equipment state, and statistical process control alarms frequently.
Análise das causas
Research shows that every 1℃ fluctuation of melt temperature changes product shrinkage by about 0.02%; ASA amorphous shrinkage is small but temperature sensitivity still exists; seasonal temperature difference and equipment temperature control drift are the main disturbance sources.
Solução
①Check the actual barrel temperature with an infrared thermometer every 2 hours; ②monitor mold temperature with a point thermometer; ③barrel temperature in winter is 5~10℃ higher than in summer for compensation; ④establish temperature-dimension SPC linkage control.
Conclusão principal
The premise of ASA dimensional stability is temperature stability; the 0.02%/℃ sensitivity coefficient accumulates to tolerance overrun; institutionalized temperature measurement is more effective than frequent machine adjustment.
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