Hot bubble inkjet technology is represented by HP, Canon, and Lexmark. Canon uses side-spray hot bubble inkjet technology, while HP and Lexmark use top-jet hot bubble inkjet technology.
A. Principle Hot bubble inkjet technology heats the nozzle to make the ink bubble and then spray it onto the surface of the printing medium. It works by using an electric heating element (usually a thermal resistance) on the inkjet head to rapidly heat up to 300°C in 3 microseconds, activating the ink at the bottom of the nozzle and forming a bubble that isolates the ink from the heating element and avoids heating the entire ink in the nozzle. After the heating signal disappears, the surface of the heated ceramic begins to cool down, but the residual heat still causes the bubbles to expand rapidly to the maximum within 8 microseconds, and the resulting pressure compresses a certain amount of ink droplets to quickly eject from the nozzle despite the surface tension. The amount of ink sprayed on the paper can be controlled by changing the temperature of the heating element, and finally the purpose of printing the image can be achieved. The process of heating the jet ink in the entire inkjet head is very fast, from heating to the growth of bubbles to the disappearance of bubbles, until the whole cycle of preparing for the next spray takes only 140~200 microseconds.
Post time: Apr-23-2024