Application of New Ink Technology in Anti-counterfeiting Packaging (I)

Ink technology is a major aspect of the application of printing technology in anti-counterfeit packaging.

The application of ink technology to anti-counterfeit packaging is accomplished by changing the ink formulation or by adding special sensitive materials, such as photosensitive materials, heat-sensitive materials, magnetic materials, etc., to ordinary inks. The trademarks printed with these special inks have some unique features. Consumers can identify the authenticity of goods based on different characteristics, and the trademarks themselves are not easily copied. Therefore, they have the effect of anti-counterfeit packaging.

There are many factors that need to be taken into consideration when using ink technology to reasonably apply to anti-counterfeiting packaging and obtain the desired anti-counterfeit effect, including the choice of printing methods, the selection of printing machines, the processing of printed parts, the use of ink base materials, and the cost of printing. Enterprise technology level and so on.

Anti-counterfeit package commonly used ink

Anti-counterfeiting packaging inks are used to ensure that the printed products have certain anti-counterfeiting capabilities, and appropriate amounts of special substances are added in the preparation of printing inks, and the printing inks exhibit special properties under certain conditions after printing. Varied special materials have formed a variety of anti-counterfeit packaging inks.

Thermal inks Thermochromic pigments can change color depending on the temperature, and different temperatures show different colors. There are many kinds of pigments that can exhibit the thermal discoloration characteristics, and there are commonly used crystal structure change types, thermal decomposition types, and crystal transfer types. At present, there are many kinds of thermal printing inks on the market, which can basically meet the requirements of thermal discoloration. However, the characteristics of different types are quite different. For example, the liquid crystal type ink has better discoloration, 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 magnetic inks used in magnetic inks are magnetic. The commonly used ones include ferric oxide, etc. The residual magnetism is relatively high. The continuous material is usually an alkyd resin, and other pigments can also be added to the magnetic ink to obtain various colors. Ink. Magnetic ink is used in anti-counterfeit packaging to form a secret anti-counterfeiting function. In a certain part of the packaging with magnetic ink printing, with special means can be detected, thus forming a secret anti-counterfeiting.

Fluorescent inks and phosphorescent inks Fluorescent inks are made from glazing materials dissolved in the corresponding resins. Fluorescent pigments are generally larger in size, and the types of binders are also more. Different binders will produce different fluorescence. When using fluorescent inks, they should ensure that they have sufficient agricultural quality. The ink layer on the printed products 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.

To overcome the above disadvantages is the use of anti-counterfeiting inks online. Enterprises can directly arrange printing machines on the packaging line. Anti-counterfeit inks can be deployed on their own. According to different dates, different products can use different formulas, which can guarantee the ink formulation. Security does not have the drawbacks of trademark inflows. In fact, in all anti-counterfeiting methods, secret anti-counterfeiting is the most reliable one. Many of the world's largest companies rely on secret prevention and anti-counterfeiting to keep their own brand names. Coca-Cola Company and Jianlibao Company all rely on secrets. Security.

Over time, every type of security ink loses its novelty, but as long as we use it properly, it will extend its useful life. The use of anti-counterfeiting inks is a good way to use composite anti-counterfeiting inks in two ways:

One is to combine the characteristics of two or more anti-counterfeiting inks to form a new anti-counterfeiting ink;

The second is to print characters or patterns with two or more security inks. For example, if you print a barcode-like pattern, you can use a magnetic anti-counterfeiting ink to print the pattern strips, and print the pattern empty with each ink. Obviously, this will increase the technical content of the security ink. If this composite method can be used online, it will receive a better anti-counterfeiting effect.

Ink is the main material for printing. Printing is always mentioned. Ink is used. In general, printing ink is a very common material. However, in recent years, with the development of security printing, special inks for special printing have gradually become the world's Learn and be familiar with.
Types of security printing inks

Anti-counterfeiting printing ink is an important part of anti-counterfeiting technology. Anti-counterfeiting ink is an ink with anti-counterfeiting function. The ink is composed of color material, linking material and ink additives, that is, adding special performance anti-counterfeiting materials to the ink connecting material. Special printing ink processed by special process. Its anti-counterfeiting ability is based on the use of colorants and linking materials that have special functions in ink to prevent falsification. Today, in many fields of security printing, the use of anti-counterfeiting printing inks is very widespread. For example, anti-counterfeiting printing inks are used in various security printings such as documents, documents, trademarks, and signs. This is mainly due to the fact that anti-counterfeiting printing inks have the features of easy implementation of anti-counterfeiting technology, low cost, better concealment, and vivid colors. At present, there are dozens of inks used for security printing developed at home and abroad, which can be divided into letterpress printing inks, gravure printing inks, stencil printing inks, lithographic printing (offset printing) inks, and waterborne flexo printing inks. Different things can be divided into paper ink, printing ink, news ink, plastic ink and so on.

In addition, security ink can be divided into seven major categories according to its anti-counterfeiting function.

The first type, ultraviolet excitation fluorescent ink;

The second type, sunlight-induced color change inks;

The third category, thermal security ink (thermochromic ink);

The fourth category, chemical reaction color ink;

The fifth category, intelligent machine reading (machine expert identification) security ink;

Sixth, multi-functional or integrated security ink (laser hologram plus fluorescent security ink);

The seventh category, other special inks, such as OVI light variable security ink.

The specific implementation is mainly realized in the form of ink printing on tickets, product trademarks and packaging. These anti-counterfeiting technologies are characterized by the implementation of different external conditions, the main use of light, heat, spectral detection and other forms, to observe the color change of ink samples to achieve anti-counterfeiting purposes. Its implementation process is simple, low cost, good concealment, colorful, and easy inspection. However, smart machine reading (machine expert identification) anti-counterfeiting ink is the first choice for anti-counterfeiting technology for banknotes, tickets, tickets, and trademark packaging because of its complex detection, strong reproducibility, and diverse color changes. From the point of view of reaction characteristics and verification methods, security inks can be broadly divided into fluorescent inks, ultraviolet inks, thermal (warm) variable inks, temperature-sensitive color-changing inks, reaction color-changing inks, friction-chromic inks, and infrared anti-counterfeiting inks. Modified inks, invisible inks, magnetic inks, chemically-encrypted anti-counterfeiting inks, etc. are currently common as follows:

A. Thermochromic ink:

The principle of anti-counterfeiting is that the color material uses a substance whose color changes with temperature. Anti-counterfeiting features are changes in the color of the hand or when heated. This ink is now available in colors that are reversible, irreversible, and memory. For example, a pink chloride drill, hexamethylenetetramine (CoC12?2C6H12N4?10H20), loses crystal water (CoC12?2C6H12N4) when it rises to 35 degrees Celsius and turns sky blue when the temperature drops It absorbs moisture from the air and returns to its original color. Another example is the red cube of mercury iodide (HgI2), when heated to 137 degrees Celsius turns into blue orthorhombic crystals, cooled to room temperature, then returned to the original cyan square crystal.

Second, photosensitive color ink:

A photochromic or photoactive compound is added to the ink. Anti-counterfeiting feature is that the ink can change from colorless to colored, or from orange to black under sunlight. This ink looks like it is discolored under the sun, and it is essentially a change in ultraviolet radiation, with a wavelength of 400 to 800 nm.

Three. Humidity-sensitive color ink:

The principle of anti-counterfeiting is that the color material contains substances that change with humidity. The anti-counterfeiting feature is that the dry state is colorless, and the wet state becomes colored. This ink is reversible and irreversible, with blue, green, red and black colors.

Four. Pressure sensitive color ink:

The principle of anti-counterfeiting is to add special chemical reagents or pressure-sensitive, color-changing compounds or microcapsules to the ink. Its security features are colored or invisible graphics printed with this type of ink. When the hard object or tool is rubbed or pressed, chemical pressure change or discoloration of the dye of the micro-limb capsule breaks. The existing color and colorless points, pressure-induced color red, green, blue, purple, yellow and other colors, according to the user's request to select the display color and design notes. V. UV fluorescent ink:

The anti-counterfeiting principle is the addition of a visible fluorescing compound with ultraviolet excitation in the ink. The anti-counterfeiting feature emits red, yellow, green, and blue (400 to 800 nm) visible light under ultraviolet light (200 to 400 nm). This ink has a color and colorless distinction, there are two kinds of long wave (365nm) and short wave (254nm).

6. Infrared fluorescent ink:

The anti-counterfeit principle is to add visible fluorescent compounds with infrared excitation to the ink. Security features emit green visible light under infrared lamps. Different infrared fluorescent substances have different requirements on the infrared spectrum power.

7. Sunlight-induced color change inks:

The principle of anti-counterfeiting is to add a colorless, isomeric, organic photosensitive material molecule to the ink, which contains two localized pi-bond systems that absorb only ultraviolet light in sunlight. The anti-counterfeit feature is that when -CY=0 in the photosensitive material molecule is decomposed by the ultraviolet light in the wavelength band of 300-360 nm, these two localized π-bond systems can become a delocalized π-bond system, and this delocalized domain The π bond system absorbs some visible light and produces a certain color. It is a newly-developed daylight-inspired color-changing anti-counterfeiting ink that can detect authenticity as long as sunlight is used. Eight infrared absorption ink:

Anti-counterfeit principle is to add infrared absorption material in the ink. Anti-counterfeiting features are under the infrared detector to identify invisible marks or graphics under normal light. Due to the different intensity of infrared absorption by the substance, it is required that the infrared detector should have a certain sensitivity to accurately detect its authenticity.

9. Perspective color ink:

The principle of anti-counterfeiting is that the colorant uses multilayer interference optical debris. Anti-counterfeiting features change the color of the print when it is viewed. The technical requirement is to control the film thickness. In addition, there are many groups of colors such as green-black, red-green, and gold-gray.