The origin and classification of ink jet printing

The earliest development of nk-jet printing (inkjet printing) was in 1878. By 1951, siemens patented the technology of converting liquid ink into ink droplets. In 1964, the size of ink droplets could be controlled by a special machine. And the rate of ejection, which was the prototype of the ink jet, until 1967, Hertz developed a continuous inkjet printer, which is currently used in industrial continuous ink-jet printing. In 1972, siemens launched dro-on-demand ink-jet printing with piezoelectric. In 1979, canon introduced thermal dro-on-demand ink-jet printing, but it was called bubble ink-jet printing. Introduced thermal dro-on-demand ink-jet printing, which is the history of the development of ink-jet printing.

Inkjet printing classification

Ink-jet printing is broadly divided into two categories: continuous (continuous) and dro-on-demand (controllable); continuous is mainly used in industrial applications. For example, labels, tickets, cartons and other rough surfaces, metal surfaces, and plastic surfaces have the advantages of high speed, smoothness of the surface of the material is not very important, and there is a considerable distance between the nozzle and the material, so the thickness of the printed material is not Affected, the disadvantage is that the resolution is not very high, and it is usually used on the surface of rough, not very analytically focused materials. Currently, continuous development of binary deflection and multiple deflection are used. The principle of voltage deflection is that the former supplies ink according to the way the ink is charged and the ink is not charged when the battery is not energized. After the ink droplet is ejected and passes through the high pressure deflection board, the direction of the skew can be controlled and the precision can be more accurately achieved. Where ink is jetted, ink droplets that are not energized are introduced into an ink guide and can be recycled.

Digital inkjet printing, also known as color inkjet printing, uses a scanner or digital camera as an input device to input the desired text into a computer, edited by an electronic color separation system, and then directly controlled by the computer's inkjet system. Dyestuffs or pigments are sprayed on fabrics for printing. Inkjet printing can be classified into continuous ink-jet and drop-on-demand according to the ink jet principle.

1. Continuous jet cij (continuous lnk jet)

The continuous jet principle is to apply a high frequency oscillating pressure to the ink, so that the ink is ejected from the nozzle to form a uniform continuous droplet flow. At the nozzle there is an electric field that changes in synchronization with the graphic photoelectric conversion signal. The ejected droplets are selectively charged in the charging electric field. When the droplet stream continues to pass through the deflection electric field, the charged droplets are deflected by the electric field, and the uncharged droplets continue to maintain the straight flight state. Drops flying in a straight line cannot reach the substrate and are recovered by the liquid trap. The charged droplets are ejected onto the substrate to complete the printing.

2. On-demand jet dod (dro on demand)

The working principle of the on-demand jet printing system is that when printing is required, the system applies high-frequency mechanical force and electromagnetic thermal shock to the ink in the nozzle, so that it forms tiny droplets to be ejected from the nozzle and is controlled by a computer to eject the ink. The pattern is set. The most widely used on-demand spray type is thermal ink jet technology, which relies on thermal pulsation to generate ink droplets. A computer controls a heated resistance wire to a specified temperature, causing ink gas (fog) to be ejected from the nozzle. Another dod technology is a voltage-type injection system, which is controlled by a computer to impose a potential on the conductive material so that the conductive material is compressed in the direction of the electric field, and expansion occurs in the vertical direction, so that the ink is ejected.

Inkjet printing not only requires high-precision nozzle technology, high-precision control technology, but also requires the use of high-purity, high-concentration, high-fastness, high-stability ink (ink) to match it.

3. Digital inkjet printing process

The process of inkjet printing depends on the ink used. Generally, acid dyes are mainly used for carpet printing, disperse dyes are mainly used for polyester fabrics, and reactive dyes are mainly used for cotton fabrics. The following is an example of an ink jet printing process using reactive dye inks for cotton fabrics. Fabric pretreatment → prepress drying → inkjet printing → postpress drying → steaming (100-102°C, 8min) → washing → drying.

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