(DoD) process is a method for optimizing ink delivery
In the drop-on-demand process, an ink drop is only produced when it is needed for printing. The ink is contained in a thin capillary where it is protected from leaking by negative pressure. When an ink drop is required, it is triggered and sprayed onto themedium
according to various processes. In the drop-on-demand process, a distinction is made between the process based on the piezoeffect, which is used in piezo printers, and the bubble process, which works with a heating element, the bubble jet.