Ink-jet Printing is a topic that printing designers are currently concerned about. It is a type of digital printing design. It uses digital data storage images to change its output content before it is output. Therefore, it has the advantages of high speed, small amount of replication, easy combination, variable information printing design, and low pollution. Inkjet printing design has expanded the connotation of traditional printing design in the aspects of printing design format, diversified inks and printing media. At present, digital inkjet printing design, digital proofing, digital inkjet printing market, etc. have been formed.
Inkjet printing design is a non-contact, non-pressure, non-plate printing design technology. The earliest development was in 1878. In 1951, Siemens applied for a patent for the technology of converting liquid ink into ink droplets. There are problems with ink and poor results. The packaging of health products did not officially enter the practical stage until 1960. With the continuous development and progress of technology, the market continues to expand, according to US I. TStrategies predicts that by 2009, the global inkjet market (including hardware, inkjet printing design media, and ink) will have a total revenue of more than $ 57 billion.
The color performance and high image quality of the inkjet printing design have satisfied most consumers, but the printing time is still too slow, and the paper requirements are also very high, although there are many special inkjet papers on the market , But the price is too high, it is difficult for general families and student groups to use it universally, so that inkjet technology can be widely applied to a variety of papers, is the most urgent need to develop technology, if you want to make special paper special materials It is not easy to make it, so it is the direct and effective way to develop new ink components.
The ink used in inkjet printing design is a special ink with moderate viscosity, which has the properties of non-toxic, stable, non-clogging nozzle, moisture retention, good sprayability, and no corrosion to the metal components of the nozzle. At present, most inkjet inks are dye-based inks, and the ink of the inkjet printing design machine must have sufficient surface tension to prevent the ink from splashing out during ejection. In addition, the ink must be fast-drying to prevent it from blooming on the paper. Therefore, the ink itself is also one of the factors that affect the quality of the print design. When printing design, choose the right ink and adjust the printing design parameters to get a satisfactory print.
1. Composition and type of inkjet ink
Ink is a very important part of inkjet printing design. The development of inkjet ink also explains the development of inkjet printing design technology to a certain extent, because ink not only determines the quality of inkjet images, but also determines the ink. The shape of the drop and the reliability of the printing design system. Inkjet inks are generally composed of colorants, binders and additives. The ink linking material can be water, oily substance, solvent, resin, etc. It determines the dynamic properties of the ink distribution and the individual crystal engraving; in inkjet inks, the linking material accounts for 40% -90%. Colorants mainly play a role in color development in inks, generally accounting for 1% -10%. The rest are called additives, which are mainly used to improve the viscosity, adhesion strength, thermal stability, light resistance and surface tension of the ink.
In general, there are many types of inks used in the process of inkjet printing design, and there are many classification methods. At present, it is generally possible to classify the different aspects of the performance of the ink, and the ink is generally divided into water-based ink, oil-based ink, solvent-based ink and thermosetting ink according to the different binders.
1. Water-based ink
It is usually used on perforated and non-coated printing materials, such as cardboard and paper, and is also often used in the printing design of direct mail products and other commercial printing design markets. It can also be divided into pigment type and dye type. The pigment will precipitate because it is insoluble in water. Therefore, the pigment particles must be ground very fine, and it must be as small as 30μm or less to have a better printing effect, otherwise when using high resolution Easy to cause blockage. The weather resistance, light resistance, washing fastness and abrasion fastness of the pigment itself are very good. The advantage of the dye is that there is no problem with the solubility, and there are many types of colors, good vividness, but poor fastness.
2. Oil-based ink
It is most suitable for printing designs on perforated materials because it is dried by absorption. Their formula is vegetable oil or mineral oil. Its application in cardboard packaging is particularly prominent; it is not suitable for use in closed office spaces because Will cause air pollution.
The color materials used can be divided into two types: pigment type and dye type. The characteristic of oil-soluble ink is fast drying, so it is more commonly used in industry.
3. Solvent-based ink
It has a wide range of uses, from signage printing design to bar code printing design to outdoor advertising. The use of this ink is very economical and fast drying. It can be printed on a variety of materials, especially for non-coated materials, such as vinyl Base, wire mesh, glass and paper, etc.
4. UV / EB thermosetting ink
The ink is suitable for printing design on various soft and rigid substrates, such as corrugated cardboard and metal foil. UV / EB ink cures faster under UV light and has stronger durability. It is very suitable for DOD applications, such as retail display advertising, phone cards, credit cards and frequently used shopping cards.
In addition to the classification by connecting materials, in practice, there are some other classification methods: according to the color material, it is divided into organic dye-based inks, polymer dye-based inks and pigment-based inks; if used according to the ink The different drying mechanisms can be divided into volatile inks and polymeric inks. Water-based and non-aqueous inks use water or other solvents as the binder. The drying is done by the penetration and absorption of the substrate by the ink. If ordinary copy paper or flat paper is used, the ink and its binder are absorbed by the substrate together This absorption will reduce the color density and clarity of the printed design. Thermosetting ink means that this ink is solid at normal temperature, is a hot melt liquid when ejected from the nozzle, and solidifies quickly when it reaches the surface of the substrate. This rapid solidification feature can prevent the ink from spreading or penetrating into the substrate , To ensure the quality of printing design.
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