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The ink used for inkjet printing is a special ink with moderate viscosity. It has non-toxic, stable, non-clogging nozzles, moisture retention, good jetting properties, and non-corrosive properties to metal parts of the nozzle. At present, inkjet inks are mostly dye-based inks, and inks of inkjet printers must have sufficient surface tension to prevent ink from being sputtered out when ejected. In addition, the ink must be fast-drying to prevent smearing on the paper, so the ink itself is one of the factors that affect the printing quality. In the printing, select the appropriate ink, adjust the printing parameters, in order to get a satisfactory print.
Ink is a very important component in inkjet printing. The development of inkjet ink also explains the development of inkjet printing technology to a certain extent, because ink not only determines the quality of inkjet image, but also determines the ink droplets. Shape and reliability of the printing system. Inkjet inks generally consist of colorants, binders, and additives. The ink binder can be water, oily substance, solvent, resin, etc., which determines the dynamic properties of the ink distribution; in the inkjet ink, the binder accounts for 40%-90%. The colorant mainly plays a role in color development in the ink, generally accounting for 1%-10%. The rest are referred to as additives and are mainly used to improve the viscosity, adhesion, thermal stability, light resistance and surface tension of the ink.
In general, there are many types of inks used in the inkjet printing process, and there are many classification methods. At present, it is generally possible to classify different aspects of the properties exhibited by the ink, and generally divide the ink into water-based inks, oil-based inks, solvent-based inks, and thermosetting inks according to different binders.
Commonly used on perforated and uncoated substrates, such as paperboard and paper, are also often used in the printing of direct mail products and other commercial printing markets. It can also be divided into pigment type and dye type. Because the pigment is insoluble in water, it will precipitate. Therefore, the pigment particles should be ground very fine. If it is as small as 30μm, it will have better printing effect. Otherwise, when using high resolution. It is easy to cause blockage. The weather resistance, light fastness, washing fastness and abrasion fastness of the pigment itself are very good. The advantage of the dye is that there is no problem in solubility, and there are many kinds of colors, and the vividness is good, but the fastness is poor.
It is most suitable for printing on perforated materials because it is dried by absorption. They are formulated with vegetable oil or mineral oil. It is especially useful in the field of cardboard packaging; it is not suitable for use in confined office spaces because Air pollution is generated. The colorants used can be divided into two types: pigment type and dye type. Oil-soluble type inks are characterized by fast drying, so they are commonly used in industry.
It is used in a wide range of applications, from sign printing to bar code printing to outdoor advertising. It is economical and fast-drying and can be printed on a variety of materials, especially for non-coated materials such as vinyl and wire mesh. , glass and paper.
The ink is suitable for printing on a variety of soft and rigid substrates, such as corrugated cardboard and metal foil. UV/EB inks cure faster and have higher durability under the action of UV light. Ideal for DOD applications such as retail point display ads, calling cards, credit cards and frequently used shopping cards.
In addition to sorting by means of connecting materials, in practice, there are some other classification methods: according to the color material, divided into organic dye type ink, polymer dye type ink and pigment type ink; if used according to ink The different drying mechanisms can be divided into volatile inks and polymeric inks. Water-based and non-aqueous inks are water or other solvents used as binders. Drying is accomplished by the penetration and absorption of ink by the substrate. If ordinary copy paper or flat paper is used, the ink and its binder are absorbed together by the substrate. This absorption reduces the color density and sharpness of the print. The thermosetting ink means that the ink is solid at normal temperature, and is a hot melt liquid when ejected from the nozzle, and rapidly solidifies upon reaching the surface of the substrate. This rapid solidification prevents the ink from diffusing or penetrating into the inside of the substrate. To ensure the quality of printing.
The choice of ink is crucial. The color performance and high image quality of inkjet printing have been satisfactory to most consumers, but the printing time is still slow, and the requirements for paper are also high, although on the market. There are a lot of special papers for inkjet, but the price is too high, so it is difficult for the general family and the students to use it universally. Therefore, the inkjet technology can be widely applied to various papers. It is the most urgent technology to be developed now. It is not directly easy to make special paper for special materials cheaper, so developing new ink components is a direct and effective method.
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