printing plate
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Due to the different types of originals or different printing purposes, different plate making methods are required to be economical and effective, and the original color to be faithfully reproduced, or even more beautiful, to increase the charm.
Printing plates generally include four types: relief or typography plate, planography or lithography, intaglio or gravure, and silk screen or porous.
For the letterpress, the printed portion is convex, and the ink is stained with ink, and the non-printed portion is lowered, so that the ink is not stained, so it can be printed. Toppan has Block Plate, Movable Type, Photoengraving, Duplicate Plate, and Electronic Engraving. The characteristics of the letterpress, in the process of printing, found errors, have the opportunity to correct at any time, the ink color is strong, a large number of printing or small amount of printing are suitable, so it is used to print books, newspapers, magazines, cards, stationery, etc. .
The lithographer has a printed portion and a non-printed portion, which maintains the same height on the plate surface, and the printed portion absorbs the ink and rejects the water, and the non-printed portion absorbs the water and rejects the ink. Because water and fat can't be mixed and reversed each other, they can be printed. The lithographic plate is divided into three categories: Surface Plate, Deep-Etch Plate, and Dry Offset Plate. The characteristics of the lithographic plate are fast in plate making, large in layout, easy to overprint color, and low in cost. Although the printing capacity and expressiveness are slightly inferior to the letterpress, the printing range is the widest, and all books, newspapers and magazines can be printed, and the general picture And color prints, all of which are printed in lithograph.
For the intaglio, the printed part is sunken to store the ink, and the unprinted part is the plane. The ink on the plane must be erased so that no ink is left, and the printing is pressed against the substrate. The printing ink is immersed in the paper in the depressed groove to complete the printing. The intaglio plate is further classified into an engraving plate, an electroplating plate, and a photogravure. The characteristics of the gravure are extremely strong in the color of the ink. Although the plate making is difficult, the printed products are exquisite. Therefore, it is used to print banknotes, stamps, stocks and other securities and artworks. Since the ink layer is higher than the paper surface, photocopying is difficult, and the counterfeiting function is prevented. Photogravure, which has been used for business in recent years?
The hole version, formerly known as screen printing or enamel printing, is a special brush type. The ink is pressed from the front side of the printing plate through the plate hole and printed on the substrate on the back (lower) side of the plate. According to the plate version, the hole plate, the type of the hole plate, the hole plate version, the photo hole plate and the like are written, such as the common oil seal. The stencil is suitable for printing on special surfaces such as curved surfaces, rough surfaces, smooth surfaces, metal surfaces, non-metallic surfaces, and cloth.
In the future printing, there may be no need for a printing plate. Such as electrostatic printing, inkjet printing, laser printing, etc., has begun to put it into practice.