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Composition of ink
Content is the most fundamental purpose of printing, but to convey content, color plays a very important role. Nature can express many things in color. Ink experts first think of pigments and dyes that have long preservation periods and bright colors.
Pigments are also good dyes, can not be directly printed on the surface of the product, pigments and dyes can be firmly attached to the surface of the product should be attributed to the resin. Most of the resins are solid, and most of the resin in the ink is not a pure resin, but a mixture that dissolves into a solvent.
Ink is composed of pigments, resins, and solvents. All printing inks lack the above three components.
Pad printing inks and screen printing inks
Different printing processes do not have the same requirements for inks, and they must also add appropriate supplementary components to the inks to make them easier to use in specific applications. For example, offset inks have higher viscosity, good water resistance, and gravure printing inks are relatively thin. , good fluidity; screen printing inks must have good permeability.
The main difference between inks used in different printing processes is that the additives contained in the inks are different. This article will mainly focus on screen printing inks and pad printing inks.
In terms of substrate suitability, screen printing has great advantages, especially in the amorphous plastic hardware and direct consumer goods industries. Screen printing has been widely praised. However, there is no universal printing method in the world, and screen printing is no exception. In the area of ​​industrial printing on the surface of small areas and irregular substrates, silk screen printing encountered real troubles, and this trouble caused the birth of pad printing technology. It can be said that although there are great differences between pad printing technology and screen printing, the industries involved are very similar.
The earliest printing inks were replaced by screen printing inks. Practice has proved that there is absolutely no accommodation. However, inks used in different printing environments must have different applicability. For example, pad printing inks do not require users to have the permeability of screen printing inks, but they are required to have better thixotropy and surface dryness. To ensure that the transfer process from the steel plate to the plastic head and substrate is more accurate. The use of special pad printing inks will undoubtedly make it easier to improve the print quality.
MARABU pioneered the development of special pad printing inks. The effect of the additive keeps the surface tension of the ink within a constant range so that the ink transfer during the printing process remains absolutely consistent.
The ink transfer process is closely linked with the nature of the print head. The surface tension of the print head is controlled within a similar range to that of the print ink. This appears to be a systematic project. The essential purpose is to improve the ink transfer efficiency. The Japanese have solved this problem from another angle. They installed a plastic head cleaning device on the pad printer. However, the installed plastic head cleaning device mainly controls the amount of ink transferred, and the transfer efficiency has not improved.
MARABU has 6 (actually 8) pad printing inks to choose from: GL, mainly used on metal, ceramic, glass surface, basically a two-component ink, need to add GLH hardener, TPR, is in SR The improved printing inks based on the series of screen printing inks, the materials that can be used by SR can make TPR in the printing process; the same reason, TPY is an improved printing ink based on PY series screen printing inks. TPU inks can be used on surfaces that are very difficult to print; TPT is a pad printing ink that is primarily used on pad printers: TPL is more stable and maintains good uniformity over long rubbing conditions. There are two kinds of TPP and TPS.
It is worth noting that screen printing inks and pad printing inks are completely universal, but only need to add additives to change the printability. Therefore, when there is no special pad printing ink, screen printing ink can be used instead.
Ink color: primary color, spot color, standard color
Natural colors are rich and colorful, and it is impossible to express them all with ink. There are two methods for copying colors in printing. One is to directly mix spot colors for printing, and the other is to print by four-color overlay. .
The four colors are based on the principle of superimposition of the four color materials in the CMYK color model. In general, the four-color reproduction technology can basically reproduce the colors we require. Four-color copying techniques are generally used for documents having a level.
The advantage of copying four-color inks lies in gradation originals. For most advertising designs and creative and industrial printing, the use of spot colors is a very common phenomenon. Spot color is more able to reflect the designer's ideas, but also more easily prevent infringement. In theory, spot colors can also be used with the original color tones, but not only does the hue match perfectly, the possibility of wasting ink increases. Therefore, the copying of printing technology includes two aspects of copying technology. One is the tendency to use four-color inks to reproduce colors. The main reason is that the originals are hierarchical and there is a situation where the colors and the colors are superimposed. Primary color printing is the most difficult technology to master because it involves complex chromatics and dot synthesis. How to control the change of dot from original to film, printing plate and substrate is the core link of primary color printing technology.
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