Problems in the promotion and application of the h

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Problems in the promotion and application of UV flexo printing technology in China

the promotion and application of UV flexo printing technology in China is still a process at present. On the one hand, it is the further understanding of UV flexo printing technology, on the other hand, it needs to be improved and perfected in terms of equipment, light source, supporting equipment and process technology. The following comprehensive information at home and abroad talks about some problems that should be paid attention to in the application of UV flexo printing technology

I. UV light source: UV light source is required for each color deck of UV flexo printing. UV flexo printing inks of different colors have different ability to absorb ultraviolet rays. For example, yellow and magenta have low absorption ability and are easy to cure and dry, while blue and black have strong ability to absorb ultraviolet rays and are less easy to dry. The power of UV lamp can be allocated according to different colors, so as to ensure the reasonable drying of various colors of UV ink and save energy at the same time. Pay attention to the aging of UV light source, and replace the UV lamp tube in time to prevent incomplete curing and adhesion. The general service life of UV lamp is 1000 hours, and frequent startup will significantly shorten the service life of the lamp

II. Wrinkle roll: when using UV flexo ink, the eye angle of the ink roll should preferably be 30 ° or 60 °. The following are several commonly used ceramic corrugated rollers

2o0 line 9.5-11.0bcm corrugated roller: it can print opaque field patterns

360 line 4.5-6.5bcm corrugated roller: it can print field and line patterns

550 line cm wrinkle roller: it can print continuously adjustable image products

650 line 2.5bcm corrugated roller: it can print continuously adjustable image products

800 line 2.0bcm wrinkle roller: it can print fine continuously adjustable image products

III. rubber roller: the rubber roller must be able to resist UV ink. The commonly used rubber roller is generally made of EPDM rubber (EPDM rubber) or silicone rubber

IV. plates: Although the currently used flexographic photosensitive plates can basically be used for UV flexographic inks, it is best to choose plates with good UV resistance inks. Laboratory research has broken through nbsp; Graphene materials can be prepared on a large scale, such as DuPont's uvp-67 open type plate

v. ink viscosity the viscosity of UV flexographic ink is slightly higher than that of water-based ink or solvent flexographic ink, and the range is relatively wide. It can be in the range of 200 ~ 1000 CPS. Its working principle is that the servo system controls the electromechanical range, and the viscosity is generally 30o-500 CPS

VI. storage: UV flexo printing ink should be stored strictly away from light and heat. The storage temperature should be controlled at 5 ℃ -30 ℃, and the storage shelf life is generally half a year

VII. Additives: there are three kinds of additives commonly used in UV flexo printing inks: 1. UV active diluent; 2. UV curing accelerator; 3. UV is favored by users as an ink cleaner

VIII. Safety protection: at present, there are two main points to prevent, one is the harm of UV radiation light source to human body, and the other is the harm of UV ink to human body. The former needs to use opaque materials to shield and seal the light source and strengthen ventilation and discharge treatment. The latter should be operated with gloves to prevent UV ink from directly contacting the skin. If UV ink splashes on the skin, it should be wiped dry first, and then cleaned immediately with soap and water

at present, the number of flexo printing machines installed with UV ink curing system in foreign countries is increasing, and the existing flexo printing machines are also constantly refitting UV ink curing system. It has become a development trend to replace water-based ink and solvent-based ink with UV flexo charter machine fishing and standby tariff ink. It has been widely used in wide and narrow flexo machines. Undoubtedly, the development prospect of UV flexo technology is very bright. The promotion and application of domestic UV flexo printing technology needs to be based on our national conditions and product needs, as well as the improvement of domestic equipment and equipment. With the increasingly stringent environmental protection requirements and quality requirements, it is believed that in the near future, domestic UV flexo printing technology will also have a greater development

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