Definition and classification of the hottest ink

2022-08-08
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Definition and classification of inks

definition

printing colorants. It is composed of pigments, binders and additives. It is used for printing books and periodicals, packaging and decoration, architectural decoration, etc. With the increase of social demand, the varieties and output of inks have also expanded and increased accordingly

the United States is the world's largest ink producer and consumer, 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 driven the rapid growth of the ink manufacturing industry, making China rise rapidly in recent decades and become one of the world's major ink manufacturing countries. At present, the scale of the domestic ink industry is growing rapidly at a rate of more than 10%

classification

classification of inks. Modern inks are mainly divided into four categories according to version type:

① relief inks. A kind of ink used for printing books, newspapers, picture books, documents, account books, etc. The main feature of relief printing is that the inked part of the printing plate protrudes from the non inked part. Relief ink is divided into lead printing ink, copper plate ink, relief rotary ink and flexible relief ink according to the type of printing machine and the purpose of printing products

② lithographic ink. A kind of ink suitable for lithography. Each part of the layout of lithographic printing is basically in a plane, where the pattern is lipophilic and the non pattern is hydrophilic. The principle of oil-water repulsion is used for printing, so the lithographic ink must have water resistance. According to the process, it can be divided into offset printing ink, web offset printing ink, flat offset printing ink, anhydrous offset printing ink, iron printing ink, lithographic ink, and offset printing ink

③ gravure ink. An ink suitable for gravure printing. When printing, ink is applied to the patterned part recessed in the layout, and the ink on the non patterned part is wiped or scraped off, and then printing is carried out. There are engraving intaglio ink and photographic intaglio ink

④ hole printing ink. An ink that leaks through the hole of the printing plate to the printing surface for printing. Hole printing ink is divided into transcribing ink and silk printing ink

the ink manufacturing process can be divided into two stages: mixing pre dispersion and grinding fine dispersion. The former stirs the prepared pigment and binder into a slurry in a container; The latter still needs to be grinded and finely dispersed in the stirred slurry to overcome the cohesion of the pigment with greater mechanical pressure and shear force, and finally become a colloidal ink

at present, there are several main environmental protection inks

to meet the requirements of environmental protection, we should first change the ink composition, that is, use environmental protection materials to prepare new 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 rather than organic solvent, which significantly reduces VOC emissions, can prevent air pollution, does not affect human health, is not easy to burn, has stable inkiness, bright colors, can not be said to corrode plates, simple operation, low price, good post press adhesion, strong water resistance, and rapid drying, so it is especially suitable for food, beverages Pharmaceutical and other packaging printing materials are recognized as environmentally friendly printing materials in the world, and they are also the only printing inks approved by the American food and Drug Association

(2) UV curable ink: UV curable ink refers to the ink that uses ultraviolet light of different wavelengths and energies to form a film and dry the ink under the irradiation of the UV manufacturing standard gb/t16491 (1) 996 "standard for electronic microcomputer controlled material testing machine" and the national standard gb228 (2) 002 "tensile test method for metallic materials at room temperature". Using different UV spectra, different energies can be generated to polymerize the monomers in different ink binders into polymers, so the color film of UV ink has good mechanical and chemical properties. The main advantages of UV ink are: (1) no solvent; (2) Fast drying speed and less energy consumption; (3) Good gloss and bright colors; (4) Water resistance, solvent resistance, good wear resistance. Photoinitiator in UV ink is a compound that is easily excited by light. After absorbing light, it is excited to form free radicals, and the energy is transferred to photosensitive molecules. Click the release button or photo crosslinker to make UV ink undergo photo curing reaction. At present, UV ink has become a mature ink technology, and its pollutant emission is almost zero. In addition to solvent-free, UV ink also has the advantages of not easy to paste, clear dots, bright and bright ink color, excellent chemical resistance, low dosage and so on

(3) water based UV ink: water based UV ink is a new research direction in the field of UV ink at present. The viscosity of prepolymer in ordinary UV ink is generally very high, which needs to be diluted with active diluent. At present, the diluent acrylate compounds have different degrees of skin irritation and toxicity. Therefore, while developing low viscosity prepolymers and low toxicity active diluents, another development direction is to study water-based UV inks, that is, using water and ethanol as diluents. At present, water-based UV ink has been successfully developed and applied in some printing

in addition, alcohol soluble ink, which mainly plays a role in flexographic printing, is also a kind of ink with serious public hazards. It is mainly used in the packaging and printing of food, drugs, beverages, tobacco and alcohol, and daily necessities in contact with human body

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