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 of direct mail products and other commercial printing 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 on materials with holes, 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 it will Generate 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 to bar code printing to outdoor advertising. The use of this ink is very economical and quick-drying. It can be printed on a variety of materials, especially for the printing of non-coated materials, such as vinyl and silk screen. , Glass and paper.
4.UV / EB thermosetting ink
The ink is suitable for printing on a variety of soft and rigid substrates, such as corrugated cardboard and metal foil. UV / EB ink cures faster under the action of 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 matter. 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 printing quality.
Choose the right ink
1. Use ink provided by inkjet digital printer manufacturers
In the actual production process, producers generally choose the ink provided by inkjet equipment providers, in fact, there are advantages and disadvantages. Of course, different digital printing opportunities use different technical methods, such as continuous inkjet (CIJ) and drop-on-demand (DOD). The two inks cannot be replaced by each other, because the two technologies are completely different. CIJ technology refers to the continuous generation of ink droplets to form a stream of ink droplets and image through a deflection plate; while DOD technology, a digital signal is generated as needed Some ink drops, not an ink flow, change the ink at will, which will inevitably cause chaos in the ink output. Therefore, in production, the premise of exerting the maximum effect of the printing machine is to have a full understanding of the ink used, which needs to consider the influence of various factors.
2. Selection of printing medium and ink
For inkjet printing, how to control the printing effect on different printing media, we must analyze the performance of the substrate. Taking paper as an example, due to the thermodynamic interaction between the paper and the ink, the capillary action of the paper, and the diffusion of the chemical composition of the ink, etc., the paper absorbs the ink component, which is called ink penetration. Among them, the capillary action of paper is the main cause of ink penetration. Because the paper itself is a porous water-permeable structure, the ink is easy to spread inside the paper. With the increasing development of the paper surface coating process, the different distribution of ink inside the paper has led to different ink penetration effects. Therefore, inkjet printing paper requires paper with a certain degree of sizing and smooth surface. The sprayed ink evaporates and dries. The ink dots are round. The printed characters are clear and the graphics are beautiful. Color inkjet printing paper preferably has a very thin transparent coating on the surface, which not only absorbs ink quickly, but also avoids light scattering.
Inkjet ink can be printed on a variety of printing media, which is one of its major advantages, such as fiber, wallpaper, glass, plastic, metal foil and plastic film, of course, can also be on various types of paper. Knowing which inkjet technology is suitable for which type of material is only one aspect of the problem. In addition, is the printing material coated or uncoated? Is the printing material porous or non-porous? Does the printing material absorb water or not absorb water? How effective is the ink on the surface of the substrate? These will be related to the development of printing operations plans, improve production efficiency, and ultimately improve the return on investment.
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