Application of Ink Technology in Anti-fake Packaging

(1) Thermal ink. Also known as temperature-sensitive ink, its pigment can change color according to the change of temperature, and show different colors at different temperatures. There are many types of pigments that can exhibit thermochromic discoloration. Commonly used pigments include crystal structure change type, thermal decomposition type, and crystal transfer type.
There are many kinds of thermal printing inks on the market, which can basically meet the requirements of thermal discoloration. However, the difference between different types is larger, for example, the liquid crystal type ink has better color shifting accuracy, the metal chromium salt type ink has stronger light fastness, the printing ink of fuel type has bright colors, and the packaging and decorating effect is good.
The key to packaging and printing heat-sensitive ink is how to let consumers identify the authenticity. Enterprises can form their own anti-counterfeiting secrets according to different recipes, but they should clearly understand to what color they are exposed to at what temperature.
For example, an enterprise uses a thermal printing ink on the trademark of wine. After the trademark is heated, it can display the “Excellent” word mark and it is printed with the “Heat is Excellent” prompt. However, this kind of prompting does not provide much help for the consumer to distinguish between authenticity and falsehood. Instead, it gives counterfeiters the idea of ​​counterfeiting, because there are so many heat-sensitive inks that can achieve the effect of “excellent heat,” and it is easy to copy fakes. The secret of the manufacturer's security is insignificant. If companies choose a reasonable formula, suggesting what color the warm charge appears, then counterfeiters will have a hard time grasping the secrets of Western languages. Consumers will also be able to easily identify the authenticity of the goods and really make the packaging printing thermal inks anti-counterfeit. effect.
(2) Magnetic ink. The magnetic ink used is a magnetic material. Commonly used are ferric oxide and triiron tetraoxide. The former is brown and the latter is black. The residual magnetic properties of the two are relatively high. The binder is generally an alkyd resin, and other pigments can also be added to the magnetic ink to obtain various colors of ink.
Magnetic ink was first used primarily for printing codes on credit cards. With the development and development of computer and computer reading scanning systems, various kinds of magnetic cards came into being, from meal ticket magnetic cards used by college students to shareholders' cards on the stock market, from various kinds of shopping cards to post and telecommunications systems of postal and telecommunications systems. The use of magnetic ink provides a broad field. Because the magnetic card has the characteristics of convenient carrying and quick settlement, it will be used more widely.
Magnetic ink is used for anti-counterfeiting packaging. It is mainly printed on a certain part of the package with magnetic ink and can be detected by special means to form a secret anti-counterfeit.
Various types of magnetic cards are subject to friction in the reading system during scanning and reading, and must be stored under the effect of the electric field of the read-only system. Therefore, it is required that sufficient ink layer thickness and density be achieved during printing.
(3) Fluorescent inks and phosphorescent inks. The fluorescent ink is made of a fluorescent material dissolved in the corresponding resin. Fluorescent pigments are generally coarser particles, and the types of binders are also more. Different binders will produce different fluorescence. When using fluorescent inks, it should be ensured that it has sufficient concentration, and the ink layer on the prints should be thicker. In order to ensure a satisfactory fluorescence effect.
Prints printed with fluorescent inks are brightly coloured and have a good decorating effect. They emit sparkling fluorescence under the influence of visible light and ultraviolet light.
The anti-counterfeiting packaging fluorescent inks have the best anti-counterfeiting effect. Different formulas can get different fluorescence effects, and it is generally difficult to realistically counterfeit. The formula is in the hands of the enterprise itself, thus forming a security secret. Fluorescent inks have poor lightfastness and have poor results for outdoor prints.
Phosphorescent inks are characterized by the ability to absorb light that hits them and emit them at a certain wavelength within a certain period of time. Its pigment is zinc sulfide, and the binder is usually a neutral transparent material such as cyclohexanone resin. Mainly used for printing advertisements, signs, etc. Blending phosphorescent inks with fluorescent inks can result in better anti-counterfeit packaging.
(4) security ink. Anti-counterfeiting ink, also known as insurance ink and security ink, is the earliest special ink used in the field of anti-counterfeiting. It is mainly designed to deal with criminals who use faded spirits to alter bills. It is used to print invoices and shading of all securities. When shading spirits and other chemicals are encountered, these shadings disappear or change color. To find traces of alteration.
The mechanism of anti-counterfeit ink fade has two main aspects. The first is the use of faded pigments, such as some basic dyes, and the other is the use of contact materials that can change color when exposed to discoloration or some other chemical substances. Biphenol and so on. Both methods can get satisfactory results. The addition of fluorescent materials to security inks will have better anti-counterfeit packaging.
(5) Spray ink. Inkjet printing ink, suitable for spraying metal, plastic, glass and other materials. The pigments used for spraying inks are water-soluble dyes, and the binders are mainly polyester, polyether, chlorinated polyolefin and so on.
Inkjet printing is used more and more widely in anti-counterfeiting packaging. Because of its fast printing speed and good quality, it has been extensively equipped on the production line for printing dates and other labels. In early inkjet printers, due to the unstable quality of spray ink used, the nozzles were often blocked and the production was stopped. Now it has basically been solved. Therefore, it is required that the viscosity of the sprayed ink should be appropriate and the fluidity should be good so as not to clog the nozzle.
Improve the formulation of spray ink, add appropriate amount of fluorescent materials, magnetic materials, heat-sensitive materials, etc., will make the anti-counterfeiting effect of spray ink better.
The use of security inks There are many types of security inks. With the development of science and technology, new security inks are emerging. In general, we have studied more about the characteristics of security inks, but the application of security inks has not been discussed enough. , resulting in the use of anti-counterfeiting ink packaging can not achieve the results of effective anti-counterfeiting. Therefore, it is necessary to discuss the application of anti-counterfeiting ink, so that the anti-counterfeiting ink can really play the role of packaging anti-counterfeiting.