Editor's note: At the Eleventh Printing Information Exchange Conference in 2008, Mr. Yang Xiaoyong, Account Manager of Xaar Company, UK explained the application of digital printing and inkjet technology in printing, and introduced the characteristics and performance of Xaar print head .
Xaar was founded in Cambridge, England in 1990 and was fully listed on the London Stock Exchange in 1997. After 16 years of research, development and practice, it has created more than 700 patents and is a major supplier of industrial printheads in the global and Chinese markets. And become a leader in industry technology! Existing licensed companies include Toshiba, Konica Minolta, Brothers, Sharp, Seiko Instruments and Toyo Ink.
1. Digital printing
Application potential of digital printing in packaging
The European printing industry expert has studied the digital printing market and predicted that by 2012, the digital printing market will achieve significant development. About 20% -50% of most types of packaging will use digital printing, and on-demand inkjet will become Mainstream technology.
Why does digital printing have such potential?
In today's society, rapid pace has become the mainstream, and people pay more attention to the concept of time. The biggest feature of digital printing is the short production time. This is because digital printing has a 100% continuous workflow, without the need to make, process or clean the film, screen, printing plate or cylinder, which shortens the operation cycle. Another feature is that variable data can be printed.
In packaging, digital printing is widely used, almost suitable for any type, the main application areas are stickers and roll labels, flexible packaging, tinplate printing for iron cans and decorative containers, aluminum beverage cans, aluminum aerosol Packaging, plastic lids, plastic containers, security printing, handbags, blister packs, cartons, etc.
2. Inkjet printing
The core technology of inkjet printing is mainly composed of four parts, namely the print head, algorithm, medium and ink.
As a print head that is one of the cores of the four parts of inkjet technology, British Xaar Company has made continuous efforts to improve its performance. The inkjet printheads used in today's label and packaging printing have the following characteristics:
(1) Efficient production capacity
Single printing, fixed print head, moving printing materials, consistent with traditional printing.
(2) High quality
It is comparable to screen printing quality. Color saturation, tonal range, and text resolution are equivalent to 120 lines. The most critical technology used by Xaar printheads is the optimal combination of the sum of the information printed in a specific area and the smallest size that can eject ink droplets, at which time high-quality printing results can be achieved. [next]
Similarly, Xaar grayscale technology also has high-quality features, its main performance is:
a. The ink droplet size can be changed on a pixel basis.
Because each pixel contains more data, the effective resolution can reach 1,080dpi, with better color reproduction, and the edges of text and lines are smoother. At the same time, the size of the ink droplets can be changed, which is achieved by quickly and continuously emitting small ink droplets. It can also be said that the size of the 7 ink droplets is from 6 picoliters to 42 picoliters. Its biggest feature is that it is suitable for a variety of inks and materials
b. Two-state printing of tonal range-standard ink droplet size, especially suitable for external signs, codes and marks. (As shown on the left)
Grayscale printing-The size of the ink droplets is variable, Xaar's unique dedication, first-class packaging is necessary for high-quality printing. (As shown on the right)
c. Text and lines
(3) Extremely high stability-self-maintenance, maintain continuous working nozzle, traditional DOD technology has an ink inlet and an outlet. Bubbles will be generated during the liquid flow, and the bubbles will combine with impurities in the ink chamber, affecting the ejection performance. Since the channel structure limits the compatibility of the liquid, it can only be eliminated through the nozzle during maintenance, which is likely to block the nozzle. At this time maintenance has to interrupt printing.
(Battering the nozzle causes the nozzle to malfunction, and it can automatically recover within the millimeter range)
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