Best understand the composition of ink

Understand the composition of ink

printing is defined as the industrial reproduction process of transferring ink to the surface of the substrate through various pressures to form graphics and text. Traditional printing takes the printing plate as the intermediate carrier of graphics and text, so that the graphics and text area and the blank area are separated by various means, and then the oil and ink are transferred to the product surface. Digital printing throws the printing plate aside, and directly transfers the graphics and text in the computer to the product surface, The evolution of technology is moving in the fastest direction, but it seems that printing has no sign of abandoning ink

composition of ink

content is the most fundamental purpose of printing, but to transmit content, color plays a very important role. There are many things that can express color in nature. Ink experts first think of pigments and dyes with long storage life and bright colors

neither pigments nor dyes can be directly printed on the product surface. The reason why pigments and dyes can firmly adhere to the product surface should be attributed to resin. Most of the resins are solid. Most of the resins in the ink are not pure resins, but mixtures formed by dissolving into solvents

inks are composed of pigments, resins and solvents. All printing inks cannot lack the above. Some outsourcing enterprises only master three components of cylinder size

pad printing ink and screen printing ink

different printing processes have different requirements for ink, and appropriate supplementary components must be added to the ink to make it easier to use in specific occasions, such as offset printing ink has large viscosity, good water resistance, gravure printing ink is relatively thin, and good liquidity; Silk printing ink must have good permeability

in general, the main difference between the inks used in different printing processes lies in the different additives contained in the inks. This paper will mainly talk about silk printing inks and pad printing inks

in terms of the suitability of the substrate, silk printing has great advantages, especially in the non stereotyped plastic, hardware, electronics and direct consumer goods industries. Silk printing has won the reputation of wide 7, power consumption: less than 15W (digital display meter) and the overall power ≤ 800W. However, there is no universal printing method in the world, and silk printing is no exception. In the field of industrial printing with small area and irregular substrate surface, silk printing encountered real trouble, which led to the birth of pad printing technology. It can be said that although pad printing technology and silk printing are very different, their industrial fields are very similar

the earliest pad printing ink was replaced by silk screen printing ink, and practice has proved that there is nothing absolutely unsuitable. However, when the ink is used in different printing environments, there must be different adaptability. For example, for pad printing ink, users do not require it to have the permeability of silk screen printing ink at all, but they will require it to have better thixotropy and surface dryness, so as to ensure that the transmission process from steel plate to rubber head and substrate is more accurate. Using special pad printing ink will undoubtedly make it easier to improve the printing quality

marabu took the lead in developing special pad printing ink. The surface tension of the ink is kept in a constant range through the action of additives, so that the ink transfer in the printing process is absolutely consistent

the process of ink transfer is also closely related to the properties of the pad printing head. Controlling the surface tension of the pad printing head within a range similar to that of the pad printing ink seems to be a systematic project, and the essential purpose is to improve the ink transfer efficiency. The Japanese solve this problem from another perspective. They install a glue head cleaning device on the pad printing machine. However, the installation of a glue head cleaning device is mainly to control the transfer amount of ink, and the transfer efficiency has not been improved

ma Rabu, such as machines, indoor and outdoor lighting appliance shells, hair dryer components, etc., has six kinds of pad printing inks to choose from: GL, which is mainly used on the surface of metals, ceramics and glass. It is basically a two-component ink, which needs to add GLH hardener and TPR. It is a pad printing ink improved on the basis of SR series silk printing inks. All materials that can be used by SR can make TPR in the pad printing process; In the same way, TPY is a pad printing ink improved on the basis of Py series silk printing ink. TPU ink can be selected for the surface of materials that are very difficult to print; TPT is a pad printing ink mainly used on the oil cup pad printing machine: TPL has better stability and can maintain good uniformity under long-term friction. The other two are TPP and TPS

it is worth noting that silk screen printing ink and pad printing ink are completely universal, but additives need to be added to change the printability. Therefore, when there is no special pad printing ink, silk screen printing ink can be used instead

color of ink: primary color, spot color, standard color

the color of nature is rich and colorful, and it is impossible to express it all with ink. There are two methods to copy color in printing, one is to directly mix spot color for printing, and the other is to print through four-color superposition

four colors replicate colors according to the superposition principle of four colors in CMYK color model. Generally speaking, four color replication technology can basically replicate the colors we require, Four color reproduction technology is usually used for layered originals

the replication advantage of four-color ink lies in the hierarchical manuscript. For most advertising design and creativity, as well as industrial printing, the use of spot color is a very common phenomenon. Spot color can better reflect the designer's ideas, and it is easier to prevent infringement. Theoretically, spot colors can also be matched with primary tones, but that will not only make it difficult to match the hues completely, but also increase the possibility of wasting ink. Therefore, the color reproduction of printing technology includes two aspects of reproduction technology. One is that it tends to replicate color with four-color ink, which is mainly used when the original is hierarchical, and there is superposition between colors. Primary color printing is the most difficult technology in printing technology because it involves complex chromatics and the principle of dot synthesis. How to control the point change from original to film, plate and substrate is the core of primary color printing technology