In the printhead of a thermal ink printer, the ink is sprayed onto the paper in fast succession by means of numerous printing nozzles. Today’s printers dispose of about 400 printing nozzles. The ink volume that comes out per nozzle channel amounts to 4 to 5 Pico litres. In this way the finest printing gradations are guaranteed.
In every nozzle channel there are heating elements, which heat up to about 300 degrees
Celsius in less than 100 micro seconds, as soon as an electrical tension is created. The ink is then sprayed out of the nozzle channel and onto the paper like an explosion.
Actually, today all consumer and small office ink jet printers from Brother to Canon up to HP use the thermal printing process and this calls for the replacement of the printhead whenever it wears out.
Why do printheads wear out?
Printheads wear out particularly due to mechanical strain. This arises on the one end through the expansion and contraction of the piezo elements respectively the thermal elements and on the other end through the drying-up of the ink.
How often do printheads have to be replaced?
Within the service life of the printhead, it will dry up various times and, beyond the regular wear, it is also mechanically stressed by the printhead cleaning. A lot of modern printers, that use changeable printheads, indicate when a new printhead is necessary. In most cases though you notice yourself, that streaks arise while printing and a printhead cleaning does not help anymore.
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