Preprinted lithography in lithography

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From the history of the development of lithography, there are some of the following media have been widely used:

Lithography, until today, lithography has also been widely used in ancient painting reproduction, New Year printing, etc., in order to achieve special effects;

The Milo version is a transliteration of the English collotype. The printing of the Feilu version is a category of lithography. Is one of the earliest photolithography, because more use of thick glass as the base, it is also called "glass printing." On the thick frosted glass plate material, the Milon version is coated with a chrome glue photosensitive liquid. After the negative film and the photosensitive film layer are intimately exposed and exposed, a photochemical reaction takes place and the glue layer hardens to form an image. The depth of the image density is not composed of dots of different sizes, but the degree of hardening of the film varies depending on the amount of light received by the film. The degree of hardening determines the difference in the expansion of the film, and the different degree of expansion results in the formation of fine wrinkles with different densities. The greater the amount of light received, the greater the degree of hardening, the smaller the expansion, the more wrinkles, the less water absorbed, the more ink adhered, and the darker the tone after printing, and conversely, the brighter the tone, thereby reproducing various levels of the original surface, due to The Roland printing is direct printing, so the graphic on the printing plate should be reversed. The Milo Edition is a kind of direct printing and is best suited to reflect traditional Chinese ancient calligraphy and painting works.

Photosensitive protein plate, also known as the negative plate version or flat plate version, the base plate is aluminum or zinc plate. The lipophilic hydrophobic film in the graphic part is a sclerostin film with a high publication plane of about 3-5 [mu]m, and the blank part of the hydrophilic oleophobic film layer is an inorganic salt layer. Protein plate making process is simple, the cost of raw materials used is low, but the printing rate is low, generally 5000 to 10000 India. Because the photosensitive resin base is not strong, the quality of the plate is not stable, and the defects such as low printing rate have caused almost no use.

Flat intaglio plate, flat intaglio plate is also called positive plate plate, plate base is zinc plate. The plain intaglio plate is printed on the positive plate of the positive image, and the photo-hardened film is dissolved and removed by the developing solution, exposing the metal of the graphic part, and the metal is slightly corroded by the etching solution so that the metal of the graphic part is lower than the plate surface by 5 to 8 μm. Then it was painted with a oleophilic base paint, and the hydrophobic and hydrophobic graphic part was formed. Although the printing capacity and print quality have improved compared to the albumin, the intaglio plate is now hard to see.

Multi-layered metal plates, multi-layer metal plates use two kinds of metals with opposite hydrophilicity and oleophilicity as the printing plate, there are two kinds of metal plates and three metal plates. According to the shape of the concave and convex figures, it is divided into a flat gravure version and a peaceful type. The most commonly used are two-layer gravure and three-layer gravure. Copper chrome plated to make a two-layer gravure; metal plated copper and then chrome or nickel will be made of three-layer gravure. Multi-layered metal plate printing process. The oleophilic part of the multi-layered metal plate is the copper metal with the best lipophilicity and is treated with potassium ethylxanthogenate to directly adsorb the ink. At this time, the printing capacity has reached a very high level, but the ability of the multi-layer metal plate to restore the dots is not good. In addition, the plate-making cycle is too long and the process is complicated. Now it is no longer visible.

The pre-coated photographic plate (PS plate), PS plate is the abbreviation of the pre-coated plate. Because of its stable quality, printing capacity, and simple process, it is suitable for large-scale printing. Now, the PS plate has become the only version of the lithographic plate.


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