Processing Machinery
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PARA Barrel Residence Time
Problem Phenomenon
Small PARA products on large machines have excessive residence time, material degradation, and color and performance changes.
Cause Analysis
PARA barrel capacity should be selected so that residence time does not exceed 6 minutes; residence time = 2×(shot size/barrel capacity)×cycle time; small products on large machines are disproportionate; degradation from high-temperature residence.
Solution
①Select barrel capacity for residence time ≤6 minutes; ②Match shot size to machine; ③Calculate actual residence time; ④Purge the machine after degradation.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PARA's 6-minute residence red line needs quantitative calculation; machine matching is a precondition; formula calculation guides equipment selection.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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