The ink-jet printer knows two different device classes: drop-on-demand and continuous ink jet inkjet printer belong to the class of non-impact printers, as well as laser printer or thermal printer (fax, receipt). In contrast to the impact printers (which are required for example for breakdowns) they do without fixed form of pressure. For ink jet printers, one can distinguish between two device classes: drop on demand, these are devices that use few drops demand and continuous ink jet, these are devices that use continuous ink jet. In the following the techniques of the different models should be explained now more accurate. Drop on demand ink drops when leave these printers the nozzles of the ink work only, when they are really needed (= on demand”on-demand”).
In addition to use in the home and Office area, these printers are also frequently used in industry. Here you can depending on the ink, including electrical circuits with hot, print liquid solders”. There are two different methods: piezo printers use the piezoelectric effect. That is, a ceramic element deforms under electrical tension and compressed so the ink out of the fine nozzle of the print head. Depending on the size of the applied electrical impulse on the piezo, differently sized drops are formed. The optimal electrical pulse best using a pressure transmitter can be determined for large industrial printers. The bubble-jet printer works in a similar way, only a heating element is appropriate here instead of the piezo element that heats the water in the ink. Explosively formed a steam bubble is pressed by their printing the ink drops out of the nozzle.
The electrical impulse that controls the heating of the heating element, can be set also with appropriate measuring devices (transmitters). The drop of ink continuous ink jet on this technology permanently leave the device. The drops are different strong electrostatically charged upon leaving the print head. Then they fly through a large deflection electrode, which drops, depending on the electric charge either distracted or on the substrate makes. The distracted ink droplets are captured and reapplied to the ink tank. These printers are used only in the industry, z.B for personalized advertising or printed of expiration date.