UV ink in the flexible printing some problems that should be paid attention to
UV flexo printing technology in the domestic application of 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 & packaging 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 is equipped with 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.
2, anilox roll: when using UV flexo ink, mesh point of anilox roller transfer ink is best & 30 deg; Or 60 & deg; 。 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 can seal products.
800 line 2. 0 BCM anilox roll: fine continuous tone image of printed products.
3, rubber roller, rubber roller must be able to resist uv ink, usually use rubber roller for EPDM rubber (commonly Epdm) And silicone rubber.
4, material: though the use of flexo printing plate materials 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.
5, the use of UV flexo ink printing & packaging ink viscosity slightly bigger 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.
6, storage: UV flexo ink should strictly avoid light, avoid heat storage. Storage temperature should be controlled in 5 ℃ - 30 ℃, storage shelf life for half a year in general. The UV reactive diluent; The UV curing catalyst; The UV printing ink cleaner.
eight, safety protection: the prevention of basically has two, one is the 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 & packaging technology will be improved.
at present abroad equipped 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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