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The application of the uv ink in flexography

时间:2016-04-19 15:47来源:sankun点击:

The application of the uv ink in flexography

    UV ink, is to use a certain wavelength ultraviolet (UV) radiation, by the moment of photochemical reaction, make the liquid UV ink into solid-state ink.

    UV ink in recent 10 years with the rapid development, has entered the mature stage, and is the world recognized as pollution-free ink varieties. Held in Malaysia in August last year at the 7th international conference of Asian radiation curing, many information shows that the world (including the EB curing and UV curing) radiation curing materials is the most important application fields of the printing industry. Its main varieties include: UV glazing oil, UV screen printing ink, UV offset printing ink, UV flexo ink, UV metal printing ink and UV ink electronic circuit and so on. According to information, in 1997 the United States consumption of UV flexo ink has reached 3000 tons, and is still increasing at a speed of 9-12% a year.

    In recent years the development of domestic printing with UV material also more quickly, according to statistics, in 1998, domestic consumption has more than 2000 tons of UV printing materials (including domestic and imported materials), which is mainly used for UV glazing, printed circuit board, ink and UV printing ink, in addition, there are also some UV offset printing ink, UV letterpress printing ink, UV flexo ink usage, was still in its infancy.

   UV flexo ink widely abroad attention and favor, mainly lies in its has the following features:

  1. UV flexo ink safe and reliable, without solvent emissions, non-flammable, no pollution, is suitable for the food, beverage, tobacco, drugs and other health conditions demanding packaging printing. UV flexo printing ink has been used in the field of foreign food packaging for years, without any problems.

  2. Good UV flexo ink printing eligibility, printing quality, printing process without changing physical property, non-volatile solvent, viscosity stability, not easy to paste version of the heap, available higher viscosity printing, lis, strong branches high-definition, order the good reproducibility, inky bright light, adhesion strong, suitable for printing fine products.

  3. UV flexo printing ink can be instant drying, high production efficiency, wide adaptation, in the paper, aluminum foil, plastic and so on the different printing carrier all have good adhesion, the product can be stacked, immediately after the printing adhesion will not occur.

  4. UV flexo ink excellent physical and chemical properties. UV curing dry process is UV ink photochemical reaction, namely by the process of linear structure into a mesh structure, so has the resistance to water, alcohol, alcohol resistance, abrasion resistance, ageing resistance and many other excellent physical and chemical properties, it is not as good as the other various types of printing ink.

  5. Dosage of UV flexo ink province. In the absence of solvent evaporation, high effective ingredients, can almost 100% into ink film, its dosage is less than half of the ink and solvent ink, and can greatly decrease the number of cleaning for plate and anilox roll, so the comprehensive cost is low. Comprehensive the above characteristics, UV flexo ink no matter from the perspective of environmental protection, quality point of view, or from the perspective of technological development, has obvious advantages and development prospects.

    Application of UV flexo printing technology in the domestic, for the moment there is a process. On the one hand is to further understanding and the understanding of the UV flexo printing technology, on the other hand is the need to form a complete set of equipment, light source, equipment and technology aspects of synergy to improve and perfect. The following comprehensive information about UV flexo printing technology at home and abroad application of some of the problems should be paid attention to.

    A, UV light source: UV flexo printing each color group to be equipped with A UV light source. Different colors of UV flexo ink's capacity to absorb ultraviolet light, such as yellow and magenta absorptive capacity is low, easy to dry, curing and blue and black absorbs ultraviolet ability, less dry. Different color can be according to the distribution of UV lamp power, to ensure the reasonable drying of all kinds of UV ink, but also can save energy. Attention should be paid to the UV light aging, timely replacement ultraviolet lamp, to prevent curing incomplete, cause adhesion. U.v. tubes average life expectancy of 1000 hours, frequent can obviously shorten the lamp life.

  B, the anilox roll: when using UV flexo ink, mesh point of anilox roller transfer ink is best 30 ° and 60 °. The following ceramic anilox roller for several kinds of commonly used specifications.
2 o0 line 9.5 11.0 BCM anilox roll: printing opaque field pattern.
360 line 4.5 6.5 BCM anilox roll: field and lines can be printed pattern.
550 line 3. OBCM anilox roll: continuous tone image printing products.
650 line 2.5 BCM anilox roll: continuous tone image printing products.
800 line 2.0 BCM anilox roll: fine continuous tone image of printed products.

  C, rubber roller, rubber roller must be able to resist uv ink, commonly used rubber roller is commonly EPDM rubber or silicone rubber (EPDM).

  D, plate: though the use of flexo plate material basically can be used for UV flexo ink, but it is better to choose better resistance to UV ink plate, for example, the du pont UVP - 67 plate type, etc.

  E the use of UV flexo ink, ink viscosity is slightly greater than the water-based ink viscosity or solvent-based flexo ink, and the scope is wide, can be within the range of 200 ~ 1000 CPS, general use viscosity 30 o - 500 CPS.

  F, storage: UV flexo ink should strictly avoid light, avoid heat storage. Storage temperature should be controlled in 5 ℃ to 30 ℃, storage shelf life for half a year in general.

  G, additives: UV flexo ink there are three kinds of commonly used additives mainly: 1. The UV reactive diluent; 2. UV curing catalyst; 3. The UV printing ink cleaner.

  H, safety protection: currently, there are two main prevention, is a light source, the harm of human body of ultraviolet radiation on the dangers of UV ink. The former need to use opaque material to light shielding seal and strengthen ventilated discharge processing, operation, the latter should wear gloves to prevent UV ink direct contact with the skin, such as UV ink splashed on the skin, should be dry clean, then immediately wash with soap and water.

   UV flexo ink and its technology is still in continuous improvement and perfection, new varieties and new equipment are constantly emerging. All of which will promote in the UV printing technology will be improved.

  Currently abroad with UV curing ink flexo machine are on the increase in the system, at the same time, the existing flexo machine is in constant modified UV ink curing system. To replace water-based ink and UV flexo printing ink solvent ink has become a developing trend, in both broad and narrow flexo printing machine has been more widely used, there is no doubt that the UV flexo printing technology development prospect is very good. UV flexo printing technology popularization and application of domestic need according to our national conditions and the needs of the product, also need the domestic equipment of form a complete set of perfect, with the requirements of environmental protection and quality requirements of increasingly stringent, believe in the near future, the domestic UV flexo printing technology will have a bigger development.

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