In some printers, a printhead receives a stream of a printing fluid from an intermediate tank
which is supplied with ink from a supply tank. In such a system, printing fluid can be fed from
the intermediate tank to the printhead using an air pump to pressurize the supply of ink by
pressurizing the air volume inside the tank.
During a printhead replacement, in order to reduce the ink spill, the pressure of the air is
decreased by deactivating the air pump and activating a pressure relief valve, hence reducing
the pressure of the ink. Nevertheless, when the intermediate tank is full of ink, the pressure
of the ink is high because the bag is pushing the intermediate tank walls.
The air pressure and ink pressure can be monitored by pressure sensors.
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INC, HP, "WHITE PRINTHEADS (OR PURGERS) REMOVAL ROUTINE TO REDUCE INK SPILL", Technical Disclosure Commons, (January 17, 2021)