Large format inkjet printing classification
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The large-format color inkjet printer was formerly a pen plotter. In 1991, Hewlett-Packard first applied inkjet printing technology to large format printers, launching the world's first monochrome large format inkjet printer. The equipment used in large format inkjet printing is generally referred to as an inkjet printer and belongs to the new generation of printing family of inkjet printers. In terms of the format, it is usually more than 1m, even 3m to 5m, and because of the unlimited length, hundreds or even thousands of square meters of huge screen can be successfully completed by continuous operation of large-format printing equipment. Therefore, compared with other printing methods, large format inkjet printing has great advantages in large format, large format posters, promotional materials, outdoor advertising and other fields. In China, with the prosperity of the market economy and the expansion of commodity circulation, especially with the development of tourism and other industries and the rise of individual consumption, the large-format inkjet printing industry can not only expand the potential of the blank market, but also the social economy. The new fields triggered by development are also constantly expanding and breeding.
Large-format inkjet printing equipment is divided into two types according to the size of the large-format and large-format large-format inkjet printing equipment: large-format inkjet printers and ultra-large-format inkjet printers. The large-format inkjet printer has a width of about 1m and is dyed with dye ink. The resolution is high (up to 600~1000DPI), which can be used to print the photo effect produced by glossy photo paper. Limited by ink performance, the product is not waterproof, does not prevent ultraviolet rays, must be coated or coated later, suitable for renderings and samples.
The ultra-large format inkjet printer has a width of more than 3m and is pigmented inkjet. It mainly faces the outdoor huge advertising market, and the resolution can meet outdoor requirements (usually 24~70DPI). Pigment inks are much narrower than the color gamut of dye inks, so the color reproducibility of ultra-large format inkjet printers does not reach the level of large inkjet printers.
According to the principle of gas-jet brush and piezoelectric type according to the principle of inkjet printing, large-format inkjet devices are available in both airbrush and piezoelectric. The air brush type is the earliest form adopted by the large-format inkjet printer. The technology is mature and the equipment failure rate is low. When using this type of equipment to make super large format works, the color is too soft and the density is even. However, the text and the line are blurred, and the coating or film is required in the later stage, and the splicing is prone to chromatic aberration. At present, the market competitiveness of this technology is gradually weakening, and the piezoelectric type is gradually becoming the mainstream inkjet printing method in the inkjet printer market.
Piezoelectric type is divided into piezoelectric continuous inkjet and piezoelectric on-demand inkjet. Piezoelectric continuous inkjet uses the advanced continuous inkjet printing technology in the industrial automation production line. The equipment failure rate is very low. The low-viscosity pigment-based ink has good adsorption on almost any roll of material, even in The carpet is sprayed on the carpet, and can be directly applied to the outdoor without coating or filming. The resolution of the latest model can reach 150DPI, which is more than enough for ultra-large-format printing. The difference between on-demand inkjet and continuous inkjet is that continuous inkjet produces ink droplets in a continuous manner, and then recycles or disperses non-printed ink droplets. On-demand inkjet is only in the printed portion. Producing ink droplets is technically more advanced.
According to the ink water-soluble type, solvent type, hot-dissolved type, and UV type, the large-format inkjet equipment is divided into water-soluble inkjet, solvent-based inkjet, hot-melt inkjet, UV inkjet, etc. . Water-soluble inkjet has excellent image quality, is suitable for printing outdoor products and indoor products, has low investment cost, and is rapidly growing in digital proofing, art reproduction, photography and other market applications. It is the most commonly used inkjet method, and is divided into For pigment type and dye type, the pigment has good weather resistance, light resistance, washing fastness and abrasion fastness; the dye has many kinds of colors, and the vividness is good, but the fastness is poor. Among them, the traditional water-based ink has good color saturation, small damage to the nozzle and consumables, and low pollution, but it is not waterproof and UV-resistant. The new-generation water-based ink solves the problems of waterproofing and anti-ultraviolet rays, and has bright colors, no corrosion, no Pollution and other advantages.
Solvent-based inkjet printing is suitable for limited base materials. The price of ink is low. It can be printed directly on vinyl banners, self-adhesive vinyl, mesh fabrics, self-adhesive materials, paper, various types of plates, etc. Used in industrial printing. Solvent inks contain volatile organic compounds, which can adversely affect the environment. They should be controlled during use, storage and disposal, and should be well ventilated during use. However, due to the good printing performance, fast drying and strong durability, the printed product does not need to be coated again, which saves time and reduces the cost, and will not be eliminated in a long period of time. At present, various environmentally-friendly solvent-based inkjets have been continuously developed, which has reduced the harm of solvent-based inkjet to a certain extent, and will also strive for a solvent-based inkjet to survive in an environment-friendly atmosphere.
When the wax used in hot-melt inkjet is heated to 60 °C, it becomes a liquid. After spraying onto the material to be printed, it quickly cools down and solidifies into a solid. There is no worry about the expansion of the dot. The material suitable for printing is wide, and even printed on toilet paper. Or on sandpaper, the future development potential cannot be ignored. At present, due to the slow printing speed, poor anti-glare, and high price of the machine, the application range is still very limited.
UV inkjet is a new member of the inkjet field. The printed image has good durability, low price relative to ink, and can also print white ink. Especially after some manufacturers introduce large-format flat-type UV inkjet printing system, users can directly in wood, Printing on metal, ceramic, glass and other products may become the first choice for high-speed inkjet printing. Inkjet-printed UV inks mainly include water-based inks, hot-melt inks, and low-viscosity inks. However, the printing performance of UV inkjet has yet to be further improved. Currently, the more compelling UV inkjet devices are large format roll-to-roll UV inkjet printers. This equipment has strong production efficiency, low ink price, less environmental problems, diverse processing materials (hard and flexible materials), smaller seller competitiveness and white ink.