1. Definition of inkjet printing
Inkjet printing (ink-jetprinting) is abbreviated as inkjet printing, which converts printing information into digital printing signals under the control of a computer system, and directly or indirectly ejects industrial inkjet ink onto the substrate through an industrial inkjet head, thereby forming Graphic process. It is a non-contact, non-pressure, non-printing and printing technology. It has the common characteristics of non-version digital printing and can realize variable information printing.
There are many inkjet printing methods, and the basic principle is to input the graphic information stored in the electronic computer to the flatbed printer first, and then through a special device, under the control of the electronic computer, the nozzle sprays the mist on the surface of the substrate The ink droplets are directly imaged on the surface of the substrate according to the charge effect and become the final printed matter. The basic principle of inkjet printing is to first generate small ink droplets and then guide them to the set position. According to the difference of inkjet system, it can be divided into continuous type and on-demand type.
Continuous inkjet printing (CIJ), whether printed or non-printed, continuously generates ink droplets in a flowing manner, and then forms an image by electric field deflection transfer, and finally recovers or disperses the non-printed ink droplets . On-demand inkjet printing (DOD), ink droplets are generated only in the printed part. Dedicated to printing excellent quality images, suitable for packaging color images, textiles and large format billboards, it is an ideal choice for full-color, high-precision printing, and printing quality is its most important consideration. According to its printing color, inkjet printing can be divided into black and white inkjet printing and color inkjet printing. Black and white inkjet printing uses a single ink, the machine structure and ink system are relatively simple, and color inkjet printing is relatively more complicated.
Second, the principle of inkjet printing
The ink pump ejects the ink from the nozzle with a certain pressure to form a continuous ink flow. This ink flow obtains static electricity in the metal tube filled with high voltage in the print head and becomes an ordered flow of ink droplets. Adjust the pressure and voltage amplitude of the ink pump to generate as many micro ink droplets as possible. When the ink droplets flow through the high-voltage electric pipe, the micro ink droplets are charged, while the large ink droplets are not charged. Once the charging signal is removed, the charged micro ink droplets are deflected under the action of the DC electric field of the deflection electrode to form a printed ink beam, which is shot onto the substrate to complete the printing. Uncharged ink droplets do not deflect, and are recycled by the ink system. The interface of the synchronous color inkjet printer can accept the information of the three primary colors of color and light sent by the color image terminal, color television, and color scanner and can be stored. The gray controller is used to control the neutral gray, and the four color signals of the gray controller are respectively sent to the electrodes of the corresponding color nozzles to control the ejection amount of the ink.
3. Features of inkjet printing
1. No plate making
2. No printing plate registration
3. No pressure printing
4. Variable data
5. Good quality consistency
6. Seamless continuous printing
7. Digital control mode
8. Less waste of printing materials
9. Printing on uneven surface
10. Physical product printing (transfer)
11. Universal printing
12. High degree of automation
13. Small size of equipment
14. Fast delivery
15. One piece printed, waiting to be taken
16. Meet individual needs
17. Need less labor
18. Low overall cost
Fourth, the difference between inkjet printing and inkjet printing
Inkjet printing is used in the field of home and office, and inkjet printing is used in the field of industrial printing production.
Inkjet printing is small, desktop, printing format from A4, A3 to A0; inkjet printing is large, floor-to-ceiling, printing width from a few hundred millimeters to a few meters, currently up to 5 meters.
Inkjet printers are external output devices of computers, and inkjet printers are supporting services for computers. The inkjet printing equipment is an industrial production equipment, and the computer is a component of the inkjet printing equipment, and is a supporting service for the inkjet printing equipment.
The printing speed of inkjet printing is slow, from several pages to tens of pages per minute, and the printing speed of inkjet printing is fast, from several meters per second to hundreds or even thousands of square meters per hour.
Inkjet printers are cheaper, from a few hundred yuan to tens of thousands of yuan, and inkjet printing equipment is more expensive, from tens of thousands to tens of millions of yuan.
5. Application and development trend of inkjet printing
The resolution of inkjet printing is very high, and the printing quality is close to that of photos. Therefore, inkjet printing can produce color transparent or opaque pictures, as well as book and newspaper proofs and color image proofs. If the inkjet printer is connected to a communication device, it can also transmit long-distance images. Due to the wider and wider format of inkjet printers, the use of inkjet printers to produce large-format prints has been widely used in advertising posters and so on. Therefore, the use of inkjet printing is getting wider and wider.
Luminer label company located in Hulin, New Jersey, USA uses Epson SurePressL-4033AW digital inkjet label printing machine in combination with the company's original flexo printing machine to print short version of special labels, which cannot be achieved with traditional printing machines. Cost requirements. "It meets the customer's requirements for delivery time. Without this joint production method, we cannot achieve it," said John Borrelli, corporate partner and operations director. He cited an example of a high-end beverage label, "This beverage requires a 5.2-meter-long label. This job may take half a day to complete on a traditional printing press, and cannot meet the delivery time required by the customer. If we do not have digital printing Machine, you can only give up this business. "
On the other side of the United States, a creative label company based in Gilroy, California, purchased the Epson SurePressL-4033A digital inkjet label printer to solve short-term printing of common food labels, medical equipment and wine bottle labels. demand. "We have also seen equipment with a smaller footprint and guaranteed print quality, but its ink cost has exceeded expectations, and Epson SurePress is a relatively better choice." Its vice president Chris Martin said, "40 meters / Min production speed, 6-color ink system (adding orange and green to the original four primary colors), support for online glazing, extensive printing capabilities and entry-level prices are decisive factors for our investment decisions. "
Even the most fanatical advocates will admit that inkjet printing (or other digital printing technology) can only supplement and not completely replace traditional printing. However, as brand owners demand shorter print runs and more and more small brands enter the market, label and packaging printing companies can no longer count on the use of traditional printing equipment to complete long-run jobs as in the past, using inkjet Printing short-form jobs for packaging and labels has become an important trend.
Printing speed may still be a concern in the past. Today, the fastest printing speed of inkjet printing is as high as 60 meters per minute. Although it is still inferior to traditional printing machines, it does not need to change the plate and clean the cylinder. It also achieves effective production time. Short, and can reduce waste. Considering the comprehensive time and cost, the slower printing speed is no longer a problem for many label printing and packaging printing companies.
Because inkjet printers are based on CMYK four colors, the color gamut may be smaller than traditional printers, such as 8-color or 10-color flexo printing machines. Therefore, jobs that require a wider color gamut or that require spot colors (such as metallic or fluorescent colors) still need to be completed using traditional printing machines. Or, you can wait for a while, and adding color numbers to digital presses is no longer new. There is no doubt that the color gamut of inkjet printing will be expanded in the next two or three years.
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