A led UV light source for uv ink curing of sheet-fed offset printing machine

Abstract

The invention discloses a light-emitting diode ultraviolet (LED UV) light source for UV ink curing of a sheet-fed offset press. The LED UV light source comprises a substrate provided with a plurality of light-emitting modules. A plurality of UV light-emitting units which are integrated onto the light-emitting modules respectively are LED UV light-emitting semiconductors with the light-emitting wavelength ranging from 200 nm to 450 nm. The light-emitting modules are fixed to the substrate through thermal-conductive adhesive. The UV light-emitting units are integrated to the light-emitting modules by means of series connection and parallel connection. Further, the light-emitting modules are fixed to the substrate by means of series connection and parallel connection, are covered with a cover plate and side plates to form an LED UV curing unit. The LED UV light source with low power and power saving effect overcomes defects of conventional UV mercury lamps, needs low voltage to avoid the problem about production safety, is free of generation of harmful gas such as mercury gas to avoid damages to human bodies and environments, is free of preheating during use and long in service life reaching 25000-30000 hours, is free of shutter components due to the fact that high temperature and preheating are omitted, and accordingly is low in production cost.

Description

technical field [0001] The invention relates to an LED UV light source used for curing UV ink of a sheet-fed offset printing machine. Background technique [0002] Traditional solvent-based ink printing needs to be dried by air drying or infrared drying, which often takes several minutes or even tens of hours of drying time, which is prone to printing quality problems such as sticking. However, UV (Ultraviolet, referred to as UV, that is, ultraviolet) ink is used for printing. Under the radiation of ultraviolet light, the ink can be quickly dried and solidified within a few seconds. It is especially suitable for high-speed printing, and has good adsorption and mechanical properties for various printing materials. Therefore, UV ink printing has been widely used today. UV ink printing generally uses ultraviolet light with a wavelength of 200-450nm as a radiation energy source to trigger the rapid transformation of chemically reactive liquid printing inks into solid inks. [...

AI Technical Summary

Problems solved by technology

Yet this UV mercury lamp that is used for curing ink has the following problems: (1) in the UV mercury lamp, mercury, iron and harmful gases containing heavy metals are more serious to air pollution, to the injury of human body and equipment, Harm the health of operators; (2) Traditional UV mercury lamps are mainly driven by 1500V-2000V high voltage, normally about 20KW each, and the power converted into useful ink curing effect is only one-tenth. And it must be preheated, and the practical life is only about 1000 hours. After being scrapped, the heavy metal mercury, iron and argon gas added in the lamp tube will cause irreparable damage to the environment; (3) UV mercury lamp needs to remove the mercury in the tube cavity Ultraviolet rays can only be emitted after atomization, and the temperature needs to be above 600°C. Among them, only 15%-25% of ultraviolet rays are used for UV ink curing, and more than 50% of infrared rays. The heat release is large, and it has a great impact on the printing environment, human body, and equipment. Hazards (4) Due to the reason for the production of the UV mercury lamp, the two ends of the lamp tube and the middle of the lamp tube emit uneven light, resulting in uneven curing of the UV ink on the printed matter, and in severe cases, the printed matter is scrapped in batches; According to the spectrum required for UV ink curing and the length of the printing format, the emitted ultraviolet rays can be adjusted to the spectrum required for UV ink curing, and the length of the curing format required for printed UV inks cannot be adjusted, resulting in a great waste of energy.

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