Letterpress ink
The letterpress inks include: printed printing ink, letterpress rotary book ink, printed color ink, printed plastic ink, rubber letterpress plastic ink (ie, flexographic plastic ink), letterpress Water ink, letterpress wheel transfer ink.
The printed ink is mainly used for printing books and magazines. It is also called book ink. When printing books on a platform machine, the ink is a permeable dry ink with a certain degree of blackness. The viscosity is smaller and the yield value is lower to accommodate the uniform roller. Printing press. Book papers have a rougher structure, but they have better oil absorption properties, so they use osmotic drying inks.
Printed color inks are often used for copperplate color printing, and some are copperplate inks. When printing, it is carried out with a flat press type smaller printing machine, so the pressure is relatively large and flat, and the printing dot is mainly used. Therefore, the transfer performance of the ink is required to be good, the ink film layer in the dot should be uniform and uniform, and the fixing of the ink should be Fast, the ink film layer is not spread after imprinting, so that the dots on the printed product have a good contrast contrast, and the print is uniform and full.
Such inks should have a relatively low yield value and have a certain fluidity and viscoelasticity. Once the ink is embossed onto the paper, it should be able to dry and dry immediately. Therefore, the binder of the ink is mainly etched and dried by the oxidized conjunct film and the solvent portion, so that not only the drying is fast, but also the transfer property of the ink is good.
The letterpress wheel transfer ink is also called news rotary ink. It should adapt to high speed printing. Therefore, the news rotary ink should have good flow performance and low viscosity. Generally speaking, the faster the printing speed, the better the fluidity of the ink is required. The lower it is.
News Rotary Ink is a typical permeation-drying ink that is almost completely dry depending on the absorbent binder of the paper fibers.
The letterpress rotary book ink is suitable for use in book rotation machines between the platform machine and the news machine.
In order to adapt to printing high-quality paper at high speed, the permeation-drying type or the oxidized conjunctiva drying type can not meet the requirements, and it is easy to produce poor dryness, poor adhesion, chalking, smudging, etc. In order to overcome these drawbacks, a thermosetting ink is used. That is, in printing, after baking at a high temperature of 200 to 250 ° C, the solution in the ink is allowed to escape, so that the ink is fixed on the printed matter.
2. Flat ink
The lithographic inks include various offset inks, lithographic iron inks, lithographic photosensitive iron inks, stencil inks, offset thermosetting inks, and the like.
One of the characteristics of offset printing ink is that the coloring power of the ink is high. Because the offset printing is indirect printing, the ink footprint printed on the printed matter is very thin, and only a strong coloring power can meet the requirements, because the printing speed is getting faster and faster. The ink should have good flow properties and good drying properties. According to the characteristics of offset printing, the ink should have good water resistance, so the water resistance of the pigment in the ink is very high.
Most of the lake pigments are soluble in water and can cause turbidity. If the binder is hydrophilically emulsified, the ink will be poorly transferred and the dryness will be lowered. The resin type binder is more resistant to water than the oil type binder.
3. Gravure ink
Gravure inks include various photogravure inks, engraved gravure inks, gravure plastic film inks, and the like.
Photogravure ink is a typical volatile dry ink. Its viscosity is the lowest of all kinds of inks. It has good fluidity and low surface tension. It is easy to fully fill the concave holes of the printing plate. The ink adhesion is strong and the paper pressure is guaranteed. After printing, the ink can be transferred from the recessed hole to the surface of the printing brush to the utmost extent, and the ink is dried very quickly on the printed matter, and thoroughly.
The characteristics of the engraved gravure ink are thick and non-sticky, loose and short, and have appropriate thixotropic properties. The ink should be easy to fill the inking hole of the intaglio plate, and it is easy to wipe off the ink on the blank part of the plane when printing. Part of the ink should also be easily transferred to the printed matter. After the ink is printed on the printed product, the dotted line of the graphic should not be spread out, but should be dried quickly.
The pigment expression of engraved gravure inks is mainly ink, and transparent pigments cannot be used. Engraved intaglios are mostly used for the printing of valuable securities, so the various properties of the pigments are required to be high, such as light resistance, water resistance, heat resistance and oil resistance. In order to prevent counterfeiting, some special additives are often added to the ink.
4. Hole ink
The stencil ink includes screen printing ink, screen plastic ink, oil type writing ink, water type writing ink and the like.
Because the imprint of the silk screen is thicker by the ink applied by the squeegee and the pressure is applied, the flow characteristics of the screen printing ink should be thick, loose, and non-sticky, and the pigment content in the ink can be correspondingly less, so that the ink can be smoothly. Through the wire mesh.
The oxidative drying ink in the screen printing ink, after printing on the printed matter, the faster the drying, the better, and the volatile drying ink is heated to facilitate the evaporation of the solvent.
The printing ink is generally not too fluid, and the viscosity is relatively small, mainly relying on osmosis drying.
5. Special function ink
Microcapsule ink
The substance with special function is sealed in the capsule, and the ink is made with a suitable connecting material, and the printing is carried out without destroying the capsule, so that the printed matter has special properties. For example, liquid crystal ink, the color of the liquid crystal is changed by the difference of temperature and pressure, and is used to represent the number of the thermometer and the calculator; the fragrance ink is made into a capsule by using a fragrance, the capsule is broken to emit a fragrance; and the foaming ink is used as a foaming agent, After printing, it is heated and foamed for printing printed matter such as Braille.
Gold silver ink
Gold and silver inks use metal powder instead of pigment. In the past, gold powder and silver powder were attached to the sheet metal and silver ink. Gold and silver printing is carried out, and the varnish is mixed with gold powder or silver powder before printing, and there are also mixed inks. The brass powder for the gold powder and the aluminum powder for the silver powder are all pulverized in a sheet form to give a metallic luster.
Fluorescent ink
Fluorescent inks are inks that use fluorescent pigments, which bring vivid and intense color effects. They are often used in eye-catching prints such as advertising, packaging materials, advertisements, and exhibits. Fluorescent pigments dissolve fluorescent dyes in synthetic resins. In the middle, the particles are coarse and the light resistance is also weak. Once irradiated by the ultraviolet lamp, a more brilliant effect can be obtained.
Magnetic ink
Magnetic ink is an ink made of magnetic iron oxide powder, used for magnetic ink text reading, controlling the magnetic properties of magnetic powder, reading from the magnetic beam emitted by special literature and fonts printed, mainly used for printing credit card. Tape strip.
Safety ink (anti-counterfeiting ink)
Safety ink is an ink for printing various securities. It must have various excellent light, heat, water and oil resistance properties. Gravure ink is one. In order to prevent counterfeiting and tampering, it is necessary to use a compound which can see a special reaction, and a safety ink which is used as an ink to disappear, discolor, discolor, fade or color.
Conductive ink
The conductive ink is an ink made of gold, silver, copper or conductive carbon black, and the dried ink layer has electrical conductivity and is used for printing on printed circuits, electrodes, and the like. Gold powder, silver powder and copper powder produce their own electrical conductivity, but the price of gold and silver is too high, and copper is easily oxidized. Carbon black is prone to difference due to different properties of raw materials. Graphite crystals have the best conductivity and are currently used. One.
Copy ink (voice transfer ink)
Printing is performed by hot melt type heating and melting. The carbonless copying is colorless due to colorless coloring, and it is not necessary to rewrite the portion using the desensitizing ink to reduce the contact property during the rewriting and lose the rewriting effect, and the chemical functional material for preventing color formation is used.
There are many other functional inks, such as monitoring inks that change color under the action of gas, temperature indicating inks that change color due to temperature changes, color-developing inks that change from colorless to colored under the action of light, and also Edible ink printed on food, fired ink printed on the friction part of the matchbox, and the like.
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