Abstract
In thermal inkjet printing systems, drop weight depends on the temperature of the DIE, besides of other factors. The temperature of the DIE depends on the content which is fired all the time, because ejecting ink is heating the system itself. Temperature differences are causing drop weight increase , creating then a difference on drop velocity. But, when the swath is built around two staggered printheads addressing the same color, and one of these printheads is partially used, then exists a bias on temperature each other, creating then line banding while printing. Ideally the system should fire with the same drop weight along the swath , but this is not true when the temperature between the printheads is not the same. Print modes with strong partial die usage have not been compatible so far, in the past they were taken into account , but disregarded because of lack of image quality standards meeting. Print mode layout is shown below, where in order to make room for an extra fluid (P), one printhead is firing partially, so the temperature and drop weight printhead to printhead is different.
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Recommended Citation
INC, HP, "Dynamic Warming Adjustment Intended to equalize drop weight difference along printing swath.", Technical Disclosure Commons, (July 14, 2024)
https://www.tdcommons.org/dpubs_series/7181