Brief analysis of the development characteristics

2022-08-16
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A brief analysis of the development characteristics of UV curable inks

the United States first used UV curable inks for cardboard (carton) printing in 1969, taking the first practical step. Japan began to apply it in metal printing and label printing two years later. After that, the rapid curing, solvent-free, powder free and other characteristics of UV ink have been brought into play. The advantages of UV ink in the printing site (improvement of working environment, short delivery period, reduction of inventory, space saving, etc.) have been recognized, and its use has expanded rapidly

1. Development of LED ink

in 1969, Wang Shiwei's team was introduced, and UV curing ink was first used in cardboard (carton) printing in the United States, marking the first step towards practicality. Japan began to apply it in metal printing and label printing in 1971, two years later. After that, the rapid curing, solvent-free, powder free and other characteristics of UV ink have been brought into play. The advantages of UV ink in the printing site (improvement of working environment, short delivery period, reduction of inventory, space saving, etc.) have been recognized, and its use has expanded rapidly

however, in the past, UV light sources used in the printing industry generally used high-pressure mercury lamps and metal halogen lamps. Due to the large-scale 2 of lamps and power supply devices, users are worried about the damage of printing machines and substrates caused by large power consumption and heat generation, as well as the generation of ozone during use. However, in recent years, a kind of light-emitting diode (LED) that can emit ultraviolet light has been developed, and the special offset printing ink (fdled Series) that is used with it to cure instantly under led ultraviolet light has been developed by Toyo Ink Manufacturing Co., Ltd

this paper compares the differences between traditional lamp light source and LED light source from the environment of UV curing ink, and introduces the principle and characteristics of LED curing ink

2. Environmental coordination of UV inks

1) non VOCs inks

the so-called VOCs is the strategy of volatile organic compounds, that is, the general term of volatile organic compounds. VOCs diffused in the atmosphere has a stronger greenhouse effect than carbon dioxide, the material of global warming listed in the article. In addition, VOCs can react in the sun and become oxidants (the cause of photochemical smoke). Therefore, countries around the world, led by developed countries, have formulated strict regulations on their emissions around the world

general offset printing inks are divided into thermosetting rubber wheel inks and sheet fed offset printing inks, both of which contain petroleum solvents. Drying process of sheet fed offset printing ink: when the ink is transferred to the paper, the solvent separates from the paper and separates out the resin components. At the same time, the vegetable oil components in the ink react with oxygen in the air to form a hardened ink film. Drying process of rubber wheel ink: after printing, after heating, the solvent in the ink evaporates, and resin components are separated out, thereby forming an ink film

about VOCs emissions. Sheet fed offset printing ink has the advantage of no energy consumption during drying, but due to the need for a long drying time, strictly speaking, in this drying process, the VOCs components in the ink either remain on the substrate or are gradually released to the atmosphere. The rotary offset printing ink releases VOCs components after heating, evaporation and drying. These VOCs gases are decomposed into water and carbon dioxide after being treated in the drying oven and reburning chamber. Therefore, from the perspective of VOCs, there are countermeasures

on the other hand, UV curable inks activate the photopolymerization initiator through UV irradiation, which then promotes the combination of monomers and oligomers (low molecular components) contained in the ink through chemical reaction to form a hardened ink film. Since there is no solvent producing VOCs in UV ink, of course, VOCs will not be discharged into the atmosphere, so UV ink is an environment-friendly ink system

2) earth ring warming

carbon dioxide has just been mentioned. Here is an example from the perspective of its becoming one of the substances that cause earth ring warming. In the drying project of rubber wheel printing, due to the combustion of gaseous fuel, oxygen will be produced, which will make the center line deviate and the jack climb up to carbon. Especially as the cost of not letting the VOCs in the ink be discharged into the atmosphere, it is necessary to use a device such as a reburning chamber to burn the volatile VOCs. At this time, carbon dioxide will be produced

uv curable inks do not contain solvents, so it is unnecessary to configure the above-mentioned hot-air drying device. The energy efficiency ratio required for ink curing can be said to be glue, which indicates that China's new material industry has the foundation to "go global" to compete in the international market and more than five times that of capital round printing. Therefore, the total amount of carbon dioxide generated when using UV inks is small, which can be said to be an environmentally beneficial system from the perspective of global warming

3) powder spraying

sheet fed offset printing in order to prevent the back from sticking dirty, corn flour, etc. are sprayed evenly on the printing sheet by powder spraying. The result of powder spraying leads to the dirt of the printing machine and printed matter, and also pollutes the surrounding environment of printing, causing trouble to the on-site operators

uv printing does not need powder spraying because it is instant curing. From the perspective of working environment, UV ink is a better ink system than sheet fed offset oily ink

as mentioned above, UV ink printing system has the advantages of saving energy consumption, space and short curing time compared with the printing system using traditional sheet fed oily ink and rotary offset ink, and its use has expanded rapidly in recent years

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