Ink Industry Status and Development Trends (5)

[3] magnetic security ink

In addition to the common performance of common inks, magnetic anti-counterfeiting inks also have unique characteristics - magnetic. This magnetic property is produced by the magnetic particles 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 micrometers, and the size and shape of these particles make them very easy to arrange evenly in the magnetic field, so that a relatively high residual magnetism can be obtained. The symbols and numerals with this residual magnetism realize the discrimination function by the friction in the automatic processing device. It is the most commonly used anti-counterfeit ink, its outstanding feature is the appearance of deep color, simple detection instruments, and more used in ticket security.

Magnetic inks developed around the 1960s. At that time, people were committed to the simple and cumbersome labor of banking and postal services, and automated the automated classification of bank bills and the automation of postal services. This method is called magnetic ink alphabet recognition. Obviously, this method is premised on the generation and development of magnetic inks.

Magnetic ink In addition to the bank's and postal use for magnetic ink alphabet recognition [ie, MICR], there are readers, also known as optical scanners, which are devices that use optical principles to identify alphabetic symbols [ie, OCR]. Another major use is for printing tapes on credit cards. The printing method is generally plain printing and gravure printing. OCR ink can be designed according to the general type of ink, there are generally two types: non-readable and readable, non-readable ink refers to a variety of color inks, the ink content of the pigment is generally between 1% -5% Some may use about 20%. Readable type mainly refers to black ink. In addition to plain printing and gravure printing, gravure and silk printing can also be used for printing methods.

At present, MICR has been quickly replaced by OCR in terms of file classification. This is because the OCR device's output system can generate magnetism. It can directly input information into the computer for data processing. The OCR scan head can scan out certain forms of black or dark digital print or handwriting. Therefore, magnetic inks have been widely used to make a variety of magnetic cards.

[4] Pressure Sensitive Security Ink

Anti-cure and anti-counterfeiting inks are inks that have a color-developing chemical reaction to chemical substances used for conversion

With anti-alteration ink printing invoices and shading of all securities, when encountering eraser and other correction fluids, these textures disappear or change color to reveal traces of alteration.

Anti-flood ink anti-counterfeiting principle:

[a] Use pigments that can fade by the use of erasers or other correction fluids, such as some base-based dyes, to print shading on the amount column of securities.

[b]Prepare an anti-alteration ink by using a linking material such as biphenol that can be discolored in the presence of erasers or other chemicals. The cheque writing column printed with this ink is discolored or appears to be "waste" if it encounters eradicators or other correction fluids.

Second, the development trend of the ink industry

The development trend of the printing industry is the simplification of printing, high-efficiency, high-quality, and low-cost; the environmental protection of printed materials; prints are more timely and more exquisite. Corresponding requirements for ink also have to be high quality, versatile, adaptable, full category, non-toxic and tasteless direction. The single-fluid offset inks, water-based offset inks, and flexo-printing inks used in printing presses have been developed abroad.

1、Single fluid offset printing ink

A foreign ink company has developed a new type of offset printing ink, called single-fluid offset printing ink, which is printed without water and only ink. The ink is printed with water removed and the wetting device free from waste water, eliminating the need to coordinate ink and water balances. Unlike waterless offset printing, the use of single-fluid offset printing inks does not require special printing plates, nor does it require modification of the printing press. The ink can be printed on a sheet-fed offset press, or can be printed on a four-color offset press with a thermosetting web, which also increases the printing speed of the offset press. The use of this ink is very simple, as long as the ink directly in the fountain, you can open. In the process of printing, much less printed sheets than traditional offset printing can meet the requirements of the field density, thus greatly reducing the amount of waste paper.

2, water-based offset printing ink

Water-based inks have long been used in waterborne varnish, water-based printing inks, and gravure water-based inks, but the application of water-based inks to water-based offset printing inks is an important new product. Water-based offset inks are water-based inks containing acrylate binders. They contain no mineral oil and no volatile organic solvents. They are dried by the evaporation of water and the conjunctiva of the binder components. The drying speed is equivalent to that of waterborne gloss oils. It is purely physically dry and does not require special drying equipment, but infrared drying can be used to speed up drying.

Water-based offset printing inks are printed on all conventional offset printing machines. For example, four-color printing can be performed on the traditional four-color offset printing at the fastest printing speed. No smearing occurs and the quality of the printed matter is excellent. Water-based offset printing inks are particularly suitable for small-size sheetfed offset and short-run imprints.

3, the future of newspapers using flexo printing ink printing

Newspaper printing will develop from water-based offset printing to water-based flexo printing. The offset printing machine has a complex structure and is expensive, while the flexo printing machine and the working process are simpler, the waste paper is less, the energy consumption is low, the ink mist is small, the ink color of the printing ink is not reduced, the printing is not dirty, there is no solvent during printing and Oil participation also does not emit odors and reduce environmental pollution. With the new type of water-based [anion] printing ink can print a good newspaper. With this type of aqueous ink-printed newspapers, the conventional ink-floating papermaking method can be used to remove the ink and utilize it as a white papermaking raw material.

In addition to the above, with the emergence of a variety of binders, solvents, colorants, and the use of ink technology, a foreign company has developed a series of sheetfed offset printing inks made from purely plant-free mineral oil-based binders. Pigment ink and so on.

The application of nanotechnology in printing materials can improve the physical properties of the material, such as adding 5% nano-unpeeling in nylon 6 can increase the heat resistance temperature of nylon 6 from 60°C to 150°C, etc. It is believed that in the near future, nanometer And other high and new technologies will surely create a new world of ink development and production in China.

Source of information: packaging decoration printing window