Inkjet printing technology is an imaging device that ejects ink from the nozzle onto the surface of the substrate at a certain speed, and through the interaction of the ink and the substrate, the ink reproduces stable graphic information on the substrate. Contact direct output technology. In recent years, with the development of inkjet printing technology (nozzle technology, material technology, control technology), its application field has expanded from the original inkjet printing, digital proofing to on-demand, variable printing and other industrial applications. Benefit from the emergence of high-speed inkjet printing technology.
From drupa2008 to IPEX2010, high-speed inkjet technology has gradually passed the "concept stage" and become a "star" in the printing and packaging industry. More and more heavyweight printing and printing equipment suppliers are devoted to the development of high-speed inkjet technology and products among. In addition to equipment, the research and development of supporting paper, ink, etc. are also keeping up. High-speed inkjet not only frees everyone from the debate over the cost comparison between digital printing and traditional printing, but also makes the cost of long-form digital printing more approachable. It also makes printing more flexible and more tolerant. Therefore, it has a broader new market, creating more new development opportunities for printing companies.
In high-speed inkjet systems, inkjet ink as a color-developing material is a key technology, and its development directly determines the improvement of the output quality of high-speed inkjet, the expansion of application fields, and the speed of advancement. An important reason for the rapid development of high-speed inkjet technology is that it can adapt to different types of media and applications with different types of inks. However, currently an important factor restricting inkjet printing from becoming a mainstream printing technology, printing materials, and inks are very large. relationship.
Features of high-speed inkjet ink
According to related research, high-speed inkjet inks have the most basic composition and attributes of inkjet inks. Current inkjet inks are divided into non-full-solids inks and full-solids inks according to the composition. Among them, non-full solid content ink is divided into water-based ink and solvent-based ink, full solid content ink includes UV ink and hot melt ink. Depending on the type of colorant used, it can be divided into dye ink and pigment ink.
Solvent ink is an "ink system" formed by dissolving dyes or dispersing pigments in it using organic solvents and polymer film-forming agents as carriers. The size of pigment particles is in the range of micrometers to submicrometers. Solvent-based inks have fast drying speeds and average gloss. The inks have high adhesion to substrates after drying, and are generally insensitive to the temperature and humidity of the environment. However, organic solvents in solvent-based inks can pollute the environment. Solvent-based inks do not have high requirements for substrates, and can be directly printed on uncoated materials such as paper, plastic films, stickers, and fabrics.
Water-based ink refers to an "ink system" formed by dissolving water-soluble dyes or dispersing pigments in it using water or a mixture of water and organic solvents as a carrier. The "water" used is generally highly pure deionized water with a pH of about 10. The coloring agent can be selected from dyes and pigments. Water-based inks are typically environmentally friendly, but due to the relatively long drying and curing time of the water on the printing material, and the tendency to dry quickly in the nozzles of the inkjet head, the inkjet head is required to have higher requirements. Water-based ink is suitable for porous and non-coated printing materials, such as cardboard.
UV ink Ink composed of photocurable resin (prepolymer), reactive diluent (monomer), photoinitiator, color former, auxiliary agent, etc. The performance of the photo-curable resin largely determines the physical and chemical properties of the ink, the printability and the performance of the printed matter. The colorant of UV ink is generally pigment. Due to its fast curing speed, the tolerance of the substrate is increased.
Hot melt ink
That is, phase change ink and solid ink are solid before use. When used, they are melted by thermal energy in the corresponding printing system, and then sprayed onto the surface of the printing material to cool and solidify. Hot melt inks have very fast curing speeds, good optical properties, and environmental friendliness, but they also have the disadvantages of poor durability and friction resistance. Currently, they are mainly used for bar code printing on non-absorbent materials.
As an ink for high-speed inkjet printing, in addition to meeting the needs of high-speed printing, it has the performance requirements of pH, viscosity, conductivity and surface tension that general inkjet inks must achieve, and maintains stable physical and chemical properties. It is suitable for metal objects such as nozzles. In addition to being non-corrosive, it also requires fast spraying speed, good sprayability and good drying performance; it does not block the nozzle during the spraying process and does not dry on the nozzle wall, but it can be dried on the surface of various types of printing materials after spraying And firmly attached; the printing performance of ink such as color density, viscosity, surface tension, etc. meets the application requirements of various fields; it is not flammable under high-speed work.
High-speed inkjet ink market status
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