HP INCFollow


All printheads include a filter to filter out particles present in the ink or generated upstream of the

filter from reaching the nozzles and causing IQ defects.

In some printers, an additional filter located in the Ink Delivery System is used to capture the particles

before reaches the printhead, increasing the printhead life. Typically, these filters are replaced based

on time or number of liters of ink that has gone through the filter, based on experimental data.

However, depending on the ink type and conditions, the filter may be replaced prematurely when it

has not reached its end of life. In other cases, the filter may be replaced too late, which could end up

in IQ defects or printhead starvation if the flowrate provided to the printhead does not met the

requirement of the print job.

This invention describes a process to trigger the filter replacement based on the ink pressure drop

related to the filter, which is related to the effective area of the filter, thus the clogging of the filter.

Creative Commons License

Creative Commons License
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