During printing, the print‐zone reaches a temperature up to 45ºC. Eventually, the printhead
and the ink inside the printhead will reach the steady state temperature of the print‐zone.
This causes air bubbles in the printhead to expand due to the increase in temperature. If the
printhead cools down with a depressurized IDS (Ink Delivery System), the change in volume of
the air would be replaced by air entering through the nozzles, causing air ingestion problems.
This is the reason why IDS need to be kept pressurized after printing during the cool down
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INC, HP, "INK DROOLING DETECTION BASED ON A PRESSURE DROP", Technical Disclosure Commons, (January 17, 2021)