The definition and classification of ink

definition

Printing colorants. It consists of pigments, binders and additives. For books, packaging, decoration, architectural decoration and other printing. As society's demand increases, the variety and output of inks also expand and grow accordingly.
The United States is the largest ink producing and consuming country in the world, followed by Japan, Germany third, and China fourth. With the rapid development of China’s national economy, the prosperity of the printing and packaging industry has led to the rapid growth of the ink manufacturing industry. This has made China’s rapid rise into one of the world's largest ink manufacturers in the recent decade. Currently, the domestic ink industry scale is increasing by 10%. The above speed continues to grow rapidly.

classification

Classification of inks. Modern inks are mainly divided into four major categories:
1 letterpress ink. A type of ink used to print books, newspapers, pictures, documents, books, etc. The main feature of letterpress printing is that the printing plate surface of the ink part protrudes from the non-inking part. According to the type of printing press and the use of printed products, letterpress ink is divided into printing ink, copperplate ink, letterpress ink, and flexographic ink.
2 lithographic ink. A type of ink that is suitable for lithography. All parts of the lithographic printing plate are basically in a plane. The pattern is affixed with oil, and the non-graphic pattern is hydrophilic, and the principle of oil-water repulsion is used for printing. Therefore, the lithographic printing ink must have water resistance properties. According to the process, it can be divided into offset printing ink, web offset printing ink, flat offset printing ink, waterless offset printing ink, printing iron ink, lithographic printing ink, and stencil printing ink.
3 gravure ink. A type of ink suitable for gravure printing. During printing, the pattern portions recessed in the layout are inked, the non-patterned portions are wiped or scraped, and then printed. There are carved gravure ink and gravure ink points.
4 mesh ink. A type of ink that is printed on the printing surface through the aperture of the printing plate. Mesh version ink is divided into ink and screen printing ink.
The ink manufacturing process can be divided into two stages of stirring pre-dispersion and grinding fine dispersion. The former will mix well pigments and binders into a slurry in a container; the latter still needs to be finely dispersed and dispersed in the stirred slurry to overcome the cohesive force of the pigment with greater mechanical pressure and shearing force. Become a suspended colloidal ink.

At present, several environmentally friendly ink ink <br> <br> to comply with environmental requirements, we must first change the ink ingredients, namely the preparation of new materials using environmentally friendly inks. At present, environmental protection inks mainly include water-based inks, UV inks, water-based UV inks, and some alcohol-soluble inks.
(1) Water-based ink: The biggest difference between water-based ink and solvent-based ink is that the solvent used is water instead of organic solvent, which significantly reduces VOC emissions, can prevent air pollution, does not affect human health, is not easy to burn, and ink is stable. , Colorful, non-corrosive plate, simple operation, low price, good adhesion after printing, strong water resistance, rapid drying, it is especially suitable for food, beverages, pharmaceuticals and other packaging printed matter, is the world recognized environmental protection printing materials, It is also the only ink approved by the US Food and Drug Association in all printing inks.
(2) UV curable inks: UV curable (UV) inks are inks that use ultraviolet light of different wavelengths and energies to form and dry inks under ultraviolet irradiation. Utilizing different UV spectra, different energy can be generated, and monomers in different ink binders can be polymerized into polymers, so the UV ink film has good mechanical and chemical properties. The main advantages of UV inks are: (1) no solvent; (2) fast drying and low energy consumption; (3) good gloss and vivid colors; (4) water resistance, solvent resistance, and good abrasion resistance. Photoinitiators in UV inks are compounds that are susceptible to photoexcitation. After absorption of light, they are excited into free radicals and the energy is transferred to photosensitive molecules or photocrosslinkers, causing UV inks to undergo photocuring reactions. At present, UV ink has become a more mature ink technology, and its pollutant emissions are almost zero. In addition to solvent-free, UV inks also have the advantages of not being easy to paste, clear dots, bright and bright ink, excellent chemical resistance, and low dosage.
(3) Water-based UV inks: Water-based UV inks are the new direction of UV ink research. Prepolymers in general UV inks are generally very viscous and need to be diluted with a reactive diluent. The currently used thinner acrylate compounds have different degrees of skin irritation and toxicity. Therefore, while developing low-viscosity prepolymers and low-toxic reactive diluents, another development direction is to study water-based UV inks, that is, water. Ethanol and other diluents. At present, water-based UV inks have been successfully developed and have been used in some printing applications.
In addition, alcohol-soluble inks, which mainly play a role in flexo printing, are also very small-pollution inks. They are mainly used in food, medicines, beverages, tobacco, and daily-use packaging and printing that are in contact with the human body.
Internet language, both humorous, Microsoft Pinyin password.