Anti-counterfeit printing ink (1)
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
Ink is the main material for printing. When it comes to printing, it always mentions ink. The ink used for printing is a very common material. However, with the development of anti-counterfeiting printing in recent years, the special ink for special printing has gradually become the world. Understand and be familiar with.
Type of anti-counterfeiting printing ink
Anti-counterfeiting printing ink is an important part of anti-counterfeiting technology. Anti-counterfeiting ink refers to ink with anti-counterfeiting function. The ink is composed of coloring materials, binders and ink additives, that is, adding special properties of anti-counterfeiting materials to ink binders. Special printing ink processed by special process. The reason why it can be used for anti-counterfeiting is to use anti-counterfeiting materials and binders with special functions in the ink. Nowadays, in many fields of anti-counterfeiting printing, anti-counterfeiting printing inks are widely used, such as anti-counterfeiting printing inks for anti-counterfeiting printing of various tickets, documents, trademarks and logos. This is mainly because the anti-counterfeiting printing ink has the characteristics of convenient implementation, low cost, good concealment and bright colors. At present, there are dozens of inks used in anti-counterfeiting printing developed at home and abroad. According to the printing form, it can be divided into letterpress printing ink, gravure printing ink, stencil printing ink, lithographic (offset) ink and water-based flexographic printing ink, etc. Different materials can be divided into paper ink, printing iron ink, news ink, plastic ink and so on.
In addition, anti-counterfeiting inks can be divided into seven categories according to their anti-counterfeiting functions.
The first type, ultraviolet excitation fluorescent ink;
The second category, sunlight-exciting color-changing inks;
The third category, thermal anti-counterfeiting ink (thermotropic ink);
The fourth category, chemical reaction color changing ink;
The fifth category, intelligent machine reading (machine expert identification) anti-counterfeiting ink;
The sixth category, multi-function or integrated anti-counterfeiting ink (laser holography plus fluorescent anti-counterfeiting ink);
The seventh category, other special inks, such as OVI light variable anti-counterfeiting ink.
The specific implementation is mainly implemented on the ticket, product trademark and packaging by ink printing. These anti-counterfeiting technologies are characterized by the implementation of different external conditions, mainly using light, heat, and spectral detection to observe the color change of ink prints to achieve anti-counterfeiting purposes. The implementation process is simple, the cost is low, the concealment is good, the color is bright, and the inspection is convenient. However, intelligent machine-readable (machine expert identification) anti-counterfeiting inks are the preferred anti-counterfeiting technology for banknotes, ticket cards, ticket certificates and trademark packaging in various countries due to their complex detection, reproducibility and variety of colors. From the reaction characteristics and verification methods, anti-counterfeiting inks can be roughly divided into fluorescent inks, ultraviolet inks, thermal (warm) inks, temperature-sensitive color-changing inks, reactive color-changing inks, tribochromic inks, infrared anti-counterfeiting inks, and anti-counterfeiting inks. Painted inks, invisible inks, magnetic inks, chemically encrypted anti-counterfeiting inks, etc., are currently common:
1. Thermochromic ink:
The anti-counterfeiting principle is that the color material adopts a substance whose color changes with temperature. The security feature is a change in color when the hand is touched or heated. This ink is now available in color reversibility, color irreversibility and memory. For example: pink chlorinated diamond hexamethylenetetramine (CoC12‧2C6H12N4‧10H20), when the temperature rises to 35 degrees Celsius, it loses crystal water (CoC12‧2C6H12N4) and becomes 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), which turns into a cyan orthorhombic crystal when heated to 137 degrees Celsius. After cooling to room temperature, it returns to the original cyan crystal.
2. Photochromic ink:
A photochromic or photoactive compound is added to the ink. The anti-counterfeiting feature is that the ink can change from colorless to colored or from orange to black in sunlight. This ink looks like discoloration under sunlight, and is substantially changed by ultraviolet radiation, and has a wavelength of 400 to 800 nm.
3. Humidity-sensitive color changing ink:
The principle of anti-counterfeiting is that the colorant contains a substance whose color changes 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. It is available in four colors: blue, green, red and black.
4. Pressure sensitive color ink:
The principle of anti-counterfeiting is to add special chemical agents or pressure sensitive compounds or microcapsules to the ink. The anti-counterfeiting feature is a colored or invisible graphic printed with the ink, and a chemical pressure discoloration or a color change of the micro-capsule rupture dye occurs upon rubbing or pressing of the hard object or the tool. Available in color and colorless, the pressure-induced color has red, green, blue, purple, yellow and other colors. The color can be selected according to the user's requirements and the design is hidden.
5. Ultraviolet fluorescent ink:
The principle of anti-counterfeiting is to add a visible fluorescent complex with ultraviolet excitation to the ink. The anti-counterfeiting feature is to emit red, yellow, green, and blue (400 to 800 nm) visible light under ultraviolet light (200 to 400 nm). The ink is colored and colorless, and has long wave (365 nm) and short wave (254 nm).
6. Infrared fluorescent ink:
The anti-counterfeiting principle is to add a visible fluorescent compound with infrared excitation to the ink. The security feature is the emission of green visible light under an infrared light. Different infrared fluorescent substances have different requirements for infrared spectral power.
7. Daylight-activated color-changing ink:
The anti-counterfeiting principle is to add a colorless isomer organic photosensitive material molecule to the ink, which contains two localized π bond systems that absorb only ultraviolet light in sunlight. The anti-counterfeiting feature is that when the -CY=0 in the photosensitive material molecule is decomposed by the ultraviolet light of the 300-360 nm band, the two localized π-key systems can become a delocalized π-key system, and this delocalization The π-key system absorbs some kind of visible light to produce a certain color. It is a newly developed daylight-activated color-changing anti-counterfeiting ink that can be used for true and false detection as long as it is used by sunlight.
8. Infrared absorption ink:
The principle of anti-counterfeiting is to add an infrared absorbing material to the ink. The anti-counterfeiting feature is a mark or graphic that can be invisible under normal light under the infrared detector. Because the material absorbs infrared rays with different strengths, it is required that the infrared detector should have a certain sensitivity to accurately detect its authenticity.
9. Viewing color changing ink:
The anti-counterfeiting principle is that the colorant adopts a multilayer interference optical film. The anti-counterfeiting feature is that the color changes when the viewing angle of the printed matter is changed. The technical requirement is to control the layer thickness of the film. There are also a variety of color changes such as green-black, red-green, gold-grey.
10. Magnetic anti-counterfeiting ink:
The anti-counterfeiting principle is that the color material is made of a magnetic substance such as iron oxide or iron oxide, and a chemical substance such as cobalt is added. The anti-counterfeiting feature is that the magnetic detector can detect the magnetic signal and decode it. The technical requirement is that the magnetic toner is needle crystals of less than a micron order, so that its size and shape are easily and uniformly arranged in a magnetic field. This magnetic property is produced by a magnetic pigment contained in the ink. The most preferred magnetic pigments are ferroferric oxide (Fe304) and iron oxide (Fe20). Most of these pigments are needle-like crystals smaller than micrometers, and such particles are so large in size and shape that they are easily aligned uniformly in a magnetic field, resulting in relatively high residual magnetic properties. The symbol and the digital with such residual magnetism realize the recognition function through the friction in the automatic processing device. It is the most commonly used anti-counterfeiting ink, and its outstanding features are its dark color and simple detection instrument.
11. Anti-altering ink:
The principle of anti-counterfeiting is to add a chemical substance for alteration or a substance having a chromogenic chemical reaction to the ink. The anti-counterfeiting feature is that when the correction fluid such as Xiaoziling is encountered, the anti-painting shading may appear discolored or discolored. When encountering the correction fluid such as Xiaoziling, the printed matter has the difference of fading, coloration and discoloration.
12. Chemical encryption ink:
The principle of anti-counterfeiting is to add a specific compound to the ink. Its anti-counterfeiting feature is to apply a decryption chemistry test within a predetermined range and then immediately display a covert graphic or produce fluorescence. Different encoding and decoding chemical cryptographic combinations are available under different temperatures and pressures.
13. Invisible anti-counterfeiting ink:
The principle of anti-counterfeiting is to add invisible marks such as Isotag, Coircode, etc. to general inks. Its anti-counterfeiting feature is that these marks are invisible, and only the professional and the specific instrument and the specific wavelength of light will appear under the illumination of the specific mark to identify its authenticity. Its technical content is high and its anti-counterfeiting performance is good.
14. Intelligent machine-readable anti-counterfeiting ink:
The principle of anti-counterfeiting is to use the variability of intelligent anti-counterfeiting materials, that is, the anti-counterfeiting materials are composed of a variety of variable chemical substances, wherein the properties, types, quantities, contents, existing forms and the like of the characteristic compounds constitute the particularity and individuality of the anti-counterfeiting materials. Then, according to these specialities and individuality, the anti-counterfeiting materials and the manufactured testing instruments (the results can be detected by the calculator, the authenticity is detected) to achieve the purpose of anti-counterfeiting. Its anti-counterfeiting features are: (1) uniqueness and complexity. The technology uses many materials, many production equipments, large investment, and complicated processing technology. (2) High technical content. The technology spans multiple disciplines and combines multidisciplinary technology. (3) Intuitive and quick. The results can be seen directly from the calculator screen within 5 to 30 seconds. (4) Specificity. Because of the recognition by the calculator, the variability is extremely strong. Each authentication terminal has the encryption of the anti-counterfeiting product and the machine. Only when the detected identifier or the signature password is known at the same time can the special detection instrument be used for identification.
15. Multi-functional or comprehensive anti-counterfeiting ink:
The anti-counterfeiting principle is to add other anti-counterfeiting technologies to the general anti-counterfeiting ink to achieve multiple anti-counterfeiting functions. For example, a laser holographic logo incorporates a fluorescently encrypted security ink. Its anti-counterfeiting features, such as laser holographic logo combined with fluorescent encryption anti-counterfeiting ink, are based on the premise of not damaging the integrity of the laser holographic mark, adding new anti-counterfeiting measures for secondary encryption, thereby improving its anti-counterfeiting function. At present, a laser holographic mark secondary encryption integrated anti-counterfeiting technology has been adopted on the market, that is, a special fluorescent material can be added to a laser holographic mark through a certain process, which is invisible to the naked eye in daylight, and shows special in the detection of special instruments. Fluorescent graphic of each color. The technology has the characteristics of friction resistance, heat resistance, convenient detection, accuracy, and strong anti-counterfeiting, and the production cost is less increased.
16. Optically variable ink (OVI):
The principle of anti-counterfeiting is to add special materials to the ink so that the printing port will change color under different illumination angles. This is a kind of anti-counterfeiting ink with high technology content. Because of the complicated production process of raw materials, high technical difficulty and large equipment investment, the cost is relatively expensive, and it is very difficult to prevent it. This kind of ink is mainly used for the printing of important documents such as banknotes, evidence, ID cards, passports, etc., and the printing of securities, which can only be adapted to gravure and screen printing. However, there is also a kind of refractive ink which also has a refractive and discoloring effect. Due to the simple processing of raw materials, although the color change effect is far less than OVI, it can also have an anti-counterfeiting effect and is relatively inexpensive.
17. Nano ink:
Nanomaterials and nanotechnology are emerging high-tech products. Nowadays, they have developed rapidly and began to penetrate into various fields. They have successfully obtained many high-performance and special-performance application materials, which is a new in the history of material development. Milestones. Nano is a unit of length, meaning that the material itself is highly ultra-small and ultra-fine. Based on the various properties of nanomaterials, applying it to the ink system will bring a huge boost to the ink industry. There are many methods for obtaining nanomaterials, such as high-temperature sintering (such as sintering of carbon nanotubes), precipitation, high-temperature water dissolution, chemical vapor condensation, or modern plasma energy polymerization. By the above method, various components in the ink, such as a resin, a pigment, a filler, and the like can be made into a nano-scale raw material. In this way, due to their high fineness and good flow and lubricity, better dispersion and stability can be achieved, the amount of pigment is small, but the hiding power is high, the gloss is good, the resin particle size is fine, the film formation is continuous, uniform and smooth, and the film The layer is thin, but the image is clear, and if used in a UV ink, it may result in a faster curing speed, and at the same time, the shrinkage of the film is eliminated due to the fine uniform dispersion of the filler. In the case of glass-ceramic ink, if the inorganic material constitutes nano-scale fineness, it will save a lot of raw materials and print a finer, more beautiful and higher quality pattern. Bringing a huge revolution to the ink industry in pigments, it no longer relies on chemical pigments but instead chooses the right amount of nanoparticles to present different colors. Because some substances are in the nanometer order, the particle size is different, the color is different, or different substances, different colors, such as Ti02, SiO2, are white in the nanoparticles, Cr203 is green, and Fe203 is brown. In addition, inorganic nano-materials such as nano-A1203 have good fluidity, and the addition of ink can greatly improve the wear resistance of the ink film. The nano-scale carbon ink has electrical conductivity and has a good shielding effect against static electricity, preventing the electrical signal from being interfered by external static electricity. If it is added to the ink, it can be made into conductive ink, such as large-capacity integrated circuit, modern contact panel switch, etc. . In addition, in the conductive ink, if Ag is made of nanometer instead of micron Ag, 50% Ag powder can be saved. This conductive ink can be directly printed on ceramics and metal. The film is thin and uniform and smooth, and the performance is very good. . If the Cu and Ni materials are made of ultrafine particles of 0.1 to 1 μm, they can be used to conduct electricity instead of metals such as palladium and silver. Therefore, combining nanotechnology with anti-counterfeiting technology will open up another vast world of anti-counterfeiting inks.