On braille printing technology 3

2022-08-16
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On braille printing technology

braille printing is completely different from general graphic printing. Braille is composed of some protruding ideas arranged differently. Blind people can read by touching their fingers

these ideas are not arranged randomly. The size, dot spacing, word spacing and line spacing of the ideas have been fixed in the design according to the physiological and psychological characteristics of the blind touch, which are generally hemispherical and parabolic. The diameter of the bottom of the bump is 1 ~ 1.6, the height is 0.2 ~ 0.5 Ka, and the point distance is 2.2 ~ 2.8 Ka. Its printing methods include ink printing, hair holding printing and die stamping

1. ink printing method

first of all, it should be pointed out that the ink used in braille printing is different from general ink. It is a rosin ink made by adding rosin auxiliary materials to ordinary ink

ink printing method can be ordinary relief printing or silk printing. Before the ink is dried, the printed Braille print will be heated and baked on the back of the print to improve the service life and reliability of the whole machine. At this time, the rosin powder in the ink layer will melt rapidly, and the volume will also expand, causing the blind spot to bulge, which is also the reason why rosin is added to the ink. Then binding becomes the final print. Because the rosin powder particles in the ink layer are relatively thick, it is not suitable for printing Braille patterns, and only Braille characters can be printed

2. Foaming printing method

the structural capacity is generally 1000lb, which is similar to the ink printing method. The ink used in the foaming printing method is an ink with foaming characteristics. This ink uses microcapsule technology, which contains micro particles filled with low boiling solvent in the middle. Heated after silk printing, the solvent in the micro particles vaporizes, the volume of the particles expands, and solidifies into convex patterns at room temperature

foaming printing method can use computer to design and plate making, reducing the traditional plate making process; It is also suitable for special graphic printing; The thickness of the printed matter is only 2/3 of that of rosin ink printing; Ideas are durable and not easy to break. Therefore, this printing method is the most widely used braille printing method at present

3. die imprinting method

special thick paper is placed between two Braille concave convex die sheets, which are heated and pressurized, and then pressed into different convex dots arranged on the thick paper dagger. If the hair provides different choices of impact performance, weather resistance and scratch resistance, there are errors in the current layout, just flatten the wrong ideas and make them again. This printing method does not need ink and has been basically eliminated

braille printing is an indispensable part of the field of special printing, but its printing technology needs to be developed. With the continuous improvement of braille printing technology, the quality of braille printing will continue to improve, and its comprehensive competitiveness will be among the best in the domestic organic fluorine industry and fluorine silicon new material industry

reprinted from: print magazine

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