Introduction
HP digital printing technology has realized the combination of digitization of printing, offset printing quality and full color in the field of digital printing. Its digital printing core technology has three points: thermal transfer offset printing technology, color conversion and electronic ink (see the figure below).
All HP Indigo digital presses use electronic ink: HP Indigo ’s unique liquid ink. Electronic ink is liquid charged particles. The most fundamental core technology of HP Indigo is liquid HP Indigo electronic ink technology, which is the basis for distinguishing it from other digital printing technologies. The working principle and design of HP Indigo digital printing machine must be based on the characteristics of HP Indigo electronic ink. The imaging process of a certain color of the HP Indigo digital printing machine is roughly like this: First, the imaging board is evenly charged, and then the laser head discharges the imaging board with a laser beam according to the dot format of the color (imaging board The potential at this point becomes zero), and then the electronic ink of that color will be attached to the imaging area of ​​the imaging plate under the action of the electric field force to form an image layer. The image layer is also transferred to the blanket through the potential difference between the imaging cylinder and the blanket cylinder. The electronic ink partially dissolves after heating on the blanket, transfers to the substrate through pressure, and then solidifies and adheres to the substrate. The imaging process of other colors is the same, and it is implemented on a set of rollers (color conversion technology).
Features of HP Indigo electronic ink
HP Indigo electronic ink particles have a special shape. The ink particles have the shape of a tentacle. Each particle has a relatively large surface. When squeezed, the particles will stick to each other, unlike spherical particles, which tend to be dispersed.
As with other digital printing technologies, such as carbon pink, electronic ink also controls the position of the printing particles through an electric field to realize the digitization of printing technology. However, unlike the toner technology, HP's electronic ink particles are very small, as small as 1 to 2 microns. Such small particles in the liquid state can achieve very high printing accuracy, uniform smoothness, sharp image edges and very thin image layers. The very thin image layer can be closely combined with the surface structure of the substrate. Electronic ink can make the printing quality reach the effect of offset printing. The particles of the carbon pink agent cannot be made too small, because the dry small particles will become uncontrollable in the air. Therefore, the higher the printing speed of digital printers using toner technology, the larger the toner particles. The electronic ink can control the smallest ink particles according to the printing quality requirements. The picture on the upper right is the relationship between printing quality and printing speed and particle size.
Electronic ink particle quality: printing speed VS particle size
Under high magnification, you can easily see that the image of electronic ink is sharper than that of toner technology or even the image of traditional offset printing. At the edge of the dots or various fonts, this sharpness is more obvious. One reason lies in the imaging method of electronic ink, and the other main reason is that the particles of electronic ink are small. The carbon pink agent is greatly affected by the particles, and the floating toner particles are scattered at the edges of the image, resulting in poor image edge accuracy regardless of the type of substrate. Compared with toner, electronic ink has no diffusion and the edges are sharper (see picture).
HP Electronic Ink Carbon Pink Agent
In traditional offset printing, when the printed image dots are amplified by pressure transfer, they will be amplified, resulting in the so-called dot gain phenomenon. The dot gain of the HP digital printer is consistent and can be preset. The HP Indigo digital printing press corrects the changing dots through the built-in dot gain compensation, so as to obtain the dot size we require. Compared with traditional printing, electronic ink imaging has no dot gain, and the color consistency is good (see figure).
Electronic ink offset printing
Electronic ink meets different color needs
HP Electronic Inks meet different color needs, including:
* Standard CMYK (yellow, magenta, cyan, black).
HP Indigo spot color system
* HP IndiChrome 6 color configuration, including orange and violet to expand the color gamut range that CMYK cannot achieve.
* HP spot color. HP spot color is the only digital printing color recognized by PANTONE, which can achieve 95% of PANTONE color.
In response to the requirements of different industries, HP electronic inks have also developed white inks, fluorescent inks, special anti-counterfeiting inks, etc., which provide customers with a means to achieve high value-added printing.
All in all, the HP Indigo digital printing press is inseparable from electronic ink in terms of technology and application, and this is the main difference between the HP Indigo digital printing press and other digital printing presses.
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