Current situation and development trend of the hot

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Current situation and development trend of ink industry (V)

[3] magnetic anti-counterfeiting ink

magnetic anti-counterfeiting ink not only has the general performance of general ink, but also has unique characteristics - magnetism. This magnetism is produced by the magnetic pigments contained in the ink. The best magnetic pigments are iron oxide black [fe3o4] and iron oxide brown [fe2o3]. Most of these pigments are needle shaped crystals smaller than microns. Such particle size and shape make it easy for them to be evenly arranged in magnetism, so as to obtain relatively high residual magnetism. The symbols and numbers with this residual magnetism realize the recognition function through the friction in the automatic processing device. It is the most commonly used anti-counterfeiting ink, which is characterized by deep appearance color and simple detection instrument. It is mostly used in ticket anti-counterfeiting

magnetic inks were developed around the 1960s. At that time, people were committed to freeing themselves from the simple and cumbersome labor of banking and postal services, resulting in the automatic classification of bank bills and the automation of postal business processing. This method is called magnetic ink letter recognition. Obviously, this method is based on the production and development of magnetic ink

in addition to the magnetic ink letter recognition method [MICR] used by banks and postal services, there is also a reader, also known as an optical scanner, which uses optical principles to recognize letter symbols [OCR]. Another major use is to print tape strips on credit cards. The printing methods are generally flat printing and gravure printing. OCR inks can be designed according to general types of inks, which generally have two types: non readable and readable. Non readable Asia is the plate type ink with the greatest potential for composite materials, which refers to various color inks. The pigment content in the ink is generally between 1% and 5%, and some can be used to about 20%. Readable mainly refers to black ink. In addition to flat printing and gravure printing, gravure printing and silk screen printing can also be used

at present, MICR in document classification has been quickly replaced by OCR, because the output system of OCR equipment can produce magnetism, which can directly input information into the computer for data processing. OCR scanning head can scan a certain form of black or dark digital print or handwriting. Therefore, magnetic ink has been widely used to make a variety of magnetic cards

[4] pressure sensitive anti-counterfeiting ink

anti erasure anti-counterfeiting ink refers to the ink that has a chromogenic chemical reaction to the chemical substances used for erasure

use anti erasure ink to print the shading of invoices and all securities. When encountering erasure liquid such as xiaoziling, these shading disappear or change color, so as to find the traces of erasure

anti falsification principle of anti erasure ink:

[a] use pigments that fade when encountering xiaoziling or other erasure solutions, such as some basic dyes, to print the shading of the amount column of securities

[b] use binders that can change color when encountering xiaoziling or other chemicals, such as biphenol, to make anti erasure inks. The check capital column printed with this ink will change color or show words such as "invalid" once encountering erasing spirit or other correction liquid

second, the development trend of the ink industry

the development trend of the printing industry is to simplify printing, high efficiency, high quality and low cost; Environmental protection of printing materials; Printed matter is more timely and exquisite. Accordingly, the ink should also develop in the direction of high quality, multi-function, strong adaptability, complete categories, non-toxic and tasteless. Foreign countries have developed single fluid offset printing ink, water-based offset printing ink, flexo printing water-based ink for newspaper printing, etc

1. Single fluid offset printing ink

a foreign ink company developed a beating degree tester to sample a new type of offset printing ink, called single fluid offset printing ink, which uses only ink instead of water during printing. When the ink is printed, the water is removed and the wetting device does not produce waste water, so it is no longer necessary to coordinate the balance of ink and water. Different from anhydrous offset printing, the use of single fluid offset printing ink does not require special plates, nor does it need to transform the printing machine. The ink can be printed on a sheet fed offset press, or on a four-color offset press with thermosetting web paper, and can also improve the printing speed of the offset press. Using this kind of ink is very simple. As long as you put the ink directly into the ink bucket, you can start printing. In the process of starting printing, much less printing sheets than traditional offset printing can reach the required field density, so the amount of waste paper in starting printing is greatly reduced

2. Water based offset printing inks

water based inks have long been used in water-based varnish, water-based printing inks and photographic intaglio water-based inks, but the application of water-based inks in water-based offset printing inks is an important new product. Water based offset printing ink is a water-based ink containing acrylate binder, which does not contain mineral oil and volatile organic solvent. It is dried by evaporation of water and conjunctiva of binder components, and the drying speed is equivalent to that of water-based varnish. It belongs to pure physical drying, and no special drying device is required, but the infrared dryer can be used to speed up the drying

water-based offset printing inks are printed on all traditional offset printing machines. For example, on traditional four-color offset printing, four-color printing is carried out at the fastest printing speed, without dirt, and the printing quality is excellent. Water based offset printing ink is especially suitable for small-size sheet fed offset printing machines and short version printing pieces. It is estimated that in 2020,

3. Newspapers in the future will adopt flexo printing and water-based ink printing.

newspaper printing will develop from oily offset printing to water-based flexo printing. Offset printing machine printing unit universal experimental machine enables the piston to move freely and increase the conflict to the lowest limit. The structure is complex and expensive, while the flexographic printing machine and working process are relatively simple, with less waste paper, low energy consumption, small ink mist, no ink color fading, no rubbing dirt, no solvent and oil participation in the printing process, no smell, and reduce environmental pollution. Good newspapers can be printed with new water-based [anionic] Tun ink. The newspaper printed with this kind of water-based ink can be recycled and recycled by the usual flotation papermaking method, which can remove the ink and be used as white papermaking raw material

in addition to the above, with the emergence of a variety of binders, solvents, pigments and the abuse of ink technology, a foreign company has developed a series of sheet fed offset printing inks made of pure plant binders that do not contain mineral oil, pigment free inks, etc

the application of nanotechnology in printing materials can improve the physical properties of the material. For example, adding 5% nano decalcification to nylon 6 can increase the heat-resistant temperature of nylon 6 from 60 ℃ to 150 ℃. It is believed that in the near future, high and new technologies such as nanotechnology will create a new world for the development and production of ink in China

information source: window of packaging decoration and printing

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