What are the lithography
Lithography can be said to be a kind of traditional printing technology that appeared relatively early, and lithography has also developed many types, through continuous optimization and upgrading, lithography still occupies a large part of the printing market. Biyin Bazaar will summarize today, what are the lithography, what are the characteristics of each of them, and their development process. Kolo plate is one of the earliest photographic lithography, because of the use of thick glass as the base, so it is also called "glass plate printing". The chromium rubber photosensitive solution is coated on a thick frosted glass plate, and after the negative image film and the photosensitive film are closely exposed, a photochemical reaction occurs to cause the adhesive layer to harden to form an image. The depth of the image density is not composed of dots of different sizes, but by the different degrees of hardening of the film due to the different amounts of light received. The degree of hardening determines the different expansion of the film, and different degrees of expansion form different fine wrinkles on the dense layout. The greater the amount of light, the greater the degree of hardening, the smaller the expansion, the more wrinkles, the less moisture absorption, the more adhesion ink, the darker the tone after printing, and the brighter the tone, so as to reproduce the various layers of the original surface. Kolo plate is a kind of direct printing, which is most suitable to reflect the traditional ancient Chinese calligraphy and painting works Photosensitive protein plate, protein plate is also known as Yin plate or plano-letterpress plate, and the base plate is aluminum plate or zinc plate. The lipophilic and hydrophobic film in the graphic part is a scleroprotein film with a high base plane of about 3~5 μm, and the hydrophilic and oleophobic film layer in the blank part is an inorganic salt layer. The operation process of protein plate making is simple, and the cost of raw materials used is low, but the printing resistance is low, generally 5000~10000 prints. Due to defects such as the lack of a strong photosensitive resin base, unstable plate-making quality, and low print resistance, it is hardly used today. Flat gravure, flat gravure is also known as yang plate, and the base of the plate is zinc plate. The flat gravure plate is printed with the original version of the positive map, and the adhesive film that is not hardened by the photosensitivity is dissolved and removed by the developing solution, exposing the metal of the graphic part, and the metal is slightly corroded with corrosive liquid, so that the metal of the graphic part is 5~8μm lower than the layout, and then coated with a lipophilic base paint, and the lipophilic and hydrophobic graphic part is formed. Although there has been an improvement in terms of printing capacity and print quality compared to protein plates, planogravure plates are now rare to find. Multi-layer metal plate, multi-layer metal plate uses two kinds of metal with opposite hydrophilicity and lipophilicity as printing plates, there are two kinds of double-layer metal plate and three-layer metal plate. According to the concave and convex shape of the picture and text, it is divided into flat gravure and flat letterpress. At present, the most commonly used are two-layer planogravure and three-layer planogravure plates. The chrome plating on the copper skin made a two-layer flat gravure plate; The iron sheet is plated with copper and then chrome or nickel to make a three-layer intaglio. Exposure process of multi-layer metal plate. The lipophilic part of the multi-layer metal plate is the most lipophilic metal copper, and is treated with potassium ethylxanthate to directly adsorb the ink. At this time, the printing capacity has reached a very high stage, but the dot reduction ability of the multi-layer metal version is not good, and the plate-making cycle is too long and the process is complex, so it is no longer visible. Pre-coated photosensitive plate (PS version), PS plate is the abbreviation of pre-coated plate, due to stable quality, printing capacity, simple process, suitable for large-scale printing use, now PS plate has become the only plate for lithographic offset printing plates. The above is a brief overview of lithography, which has become a more commonly used printing method after continuous development. If you have the corresponding printing needs, you can have entered the business channel of the Biyin Bazaar, we will recommend the printing shop around you, and you are welcome to enter the Biyin Bazaar for experience. Biyin Bazaar, the first choice for cost-effective printing production services, provides professional printing services and solutions.