| 摘要 |
Optimising the pressure pulses for electro-thermal converter units in ink printing installations (bubble jet principle) is based on the temperature-dependent viscosity of the fluid ink. As the temperature rises and hence the viscosity falls, the internal friction in the fluid ink flowing through capillary tubes is reduced, as is also therefore the pressure needed to eject the drops as well as the pulse energy. As the electrical pulse energy depends upon the pulse voltage and duration, said pulse voltage and duration are altered according to the measured ink temperature so that, at an ink temperature higher or lower than a threshold value, the converter units are controlled at a reduced or increased pulse energy. |
