Small class | ink-jet printing the basis of the principle of knowledge

2021/6/7

With the continuous development of science and technology, ink is no longer just used for writing, painting and expressing emotions, but everywhere in our lives.Did you know that the beautiful prints on our clothes, posters, banners, and mugs are all created with ink ~~ and this applies to our digital inkjet printing technology!

Digital jet printing is a digital image spraying technology, which works by applying external force to the ink through the printer, so that it is sprayed on the fabric through the nozzle to form a color point. Then the color and moving direction of the ink jet are controlled by the digital technology, and the required image and color are finally formed on the surface of the fabric.

Ink-jet printing schematic

1 - nozzle 2 - modulator 3 - high pressure deflector 4 - flow into storage tank 5 - drum

The important technical index of digital printing isresolution (referred to as DPI),which refers to the number of points per inch.In inkjet printing, different base cloth on the resolution of the requirements are different Oh!!

The higher the resolution, the higher the spray frequency and the higher the directional precision of the nozzle. In general, when DPI is 180 ~ 360, the image is clear.For very fine images, DPI can reach 360 ~ 720.

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The following is a small edition to summarize some of the discussion on the resolution of digital printing.

The principle of jet printing

1. 连续喷射式CIJ ( continuous Ink Jet)

By applying high frequency vibration pressure to the printing ink, the printing ink is ejected from the nozzle to form a uniform and continuous microdrip.An electric field which changes synchronously with the graphic photoelectric conversion signal is arranged at the nozzle.

The ejected droplet is selectively charged in the charging electric field. When the droplet flow continues to pass the deflection electric field, the charged droplet is deflected under the action of the electric field, and the uncharged droplet continues to keep a straight flight state.

Droplets flying in a straight line cannot reach the substrate to be printed and are recovered by the collector. Charged droplets are sprayed onto the substrate to be printed.

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2. 按需要喷射式DOD(Drop on Demand)

When printing is needed, the system applies high-frequency mechanical force and electromagnetic thermal shock to the ink in the nozzle, so that tiny droplets are ejected from the nozzle and sprayed to the set pattern by computer control.

On demand jet type is the most widely used thermal inkjet technology, it is relying on heat pulsation to produce ink drops, by computer control of a heating resistance wire to the specified temperature, resulting in printing ink vaporization (fog) from the nozzle after ejecting.

Another DOD technology is the piezoelectric injection system, which is controlled by a computer to impose a potential on the piezoelectric material, so that the piezoelectric material in the direction of the electric field compression, in the vertical direction of expansion, so that the printing ink ejected.

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Ink-jet printing not only requires high precision nozzle technology, high precision control technology, at the same time, it requires high purity, high concentration, high fastness, high stability of the ink to match, just have use value Oh.

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