Braille printing is totally different from general graphic printing. Braille is composed of a number of differently arranged protruding ideas. The blind person can read by the touch of a finger.
These ideas are not arbitrarily arranged. The size, dot pitch, kerning, and line spacing of the ideas are all fixed in the design according to the physiological and psychological characteristics of the blind's tactile sense. They are generally hemispherical and parabolic. The diameter of the bottom of the bump is between 1 and 1.6, and the height is O. 2 to 0.5 coffee, from 2.2 to 2.8 coffee. The printing methods include an ink printing method, a hair printing method, and a mold pressing method.
1. Ink printing method
First of all, it should be pointed out that the ink used for braille printing is different from the general ink. It is a rosin ink made by adding rosin-based auxiliary materials to common inks.
The ink printing method can use ordinary letterpress printing or screen printing. Printed braille prints are heated and baked on the back of the print before the ink has dried. At this time, the rosin powder in the ink layer rapidly melts and the volume expands, causing the blind spots to bulge. This is also the reason for adding rosin to the ink. . Then stapling becomes the final print. Since the rosin powder particles in the ink layer are coarse, it is not suitable for printing Braille patterns and only Braille characters can be printed.
2. Foam printing
Similar to the ink printing method, the ink used in the foam printing method is an ink having foaming properties. This ink uses micro-capsule technology, the ink contains micro particles filled with low-boiling solvents. After heating by screen printing, the solvent in the micro-particles evaporates, the volume of the particles expands, and the embossed pattern is solidified at room temperature.
The foam printing method can be designed and plated using a computer to reduce the traditional plate-making process; it is also suitable for special graphic and text printing; the thickness of the printed product is only 2/3 of the rosin ink printing; the pips are durable and not easily damaged. Therefore, this type of printing method is currently the most widely used type of braille printing method.
3. Die stamping method
The special thick paper is placed between two brazed concave-convex mold iron sheets, and after heating and pressing, the different convex protrusions are pressed and pressed on the thick paper. If you find mistakes in the layout, just knock down the wrong ideas and try again. This printing method does not require ink, and it has basically been eliminated.
Braille printing is an indispensable part of the special printing industry, but it has yet to be developed in terms of its printing technology. With the continuous improvement of Braille printing technology, the quality of Braille prints will continue to increase.
Reprinted from: Print Magazine
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