Collotype plate printing process simple description
Collotype plate printing process simple description
Collotype collotype in English transliteration. Collotype printing is lithography area. Is one of the earliest photographic lithography, as many as a version of the base with thick glass, so called "glass printing." Ke Luo version is thick frosted glass plate, the photosensitive liquid plastic coating of chromium, with overcast and light-sensitive film as the film exposed the FN, which happened hardened layer caused by photochemical reaction to form the images. Not by the depth of the image density of dots of different sizes, but by the film due to the different amount of light, so that varying degrees of film hardening. The film also decided to expand sclerosis different circumstances, different level of formation of the expansion of the fine wrinkles of different layout density.
By the amount of light the greater the degree of hardening of the greater expansion of the smaller, more wrinkles, less moisture absorption, adhesion of ink more darker colors after printing the contrary, the more bright colors to reproduce original things to all levels, as Ke Lo printing is a direct printing, graphic printing plate so should anti-like. Collotype printing plate making process is as follows: ground glass coating photosensitive liquid contact exposure imaging, wetting treatment printing. 1, ground glass To about 10 mm thick plate glass, with the amount of silicon carbide, and then resume with the same thickness of glass, grinding each other to grind the surface smooth rough glass surface, after cleaning, drying and coating layer silicate mixture (a mixture of liquid sodium and protein) as the bottom, bottom to prevent the glass coating surface soil, and to make photographic film adhesion on the glass more firmly. Second photosensitive coating solution After a certain amount of heat sensitive after the dichromate gelatin solution coated in a dark room to the bottom surface of coated glass, flat on the 40 ~ 60 in the oven drying, drying will produce bubbles when the temperature is too high, photographic film, once dried, the surface to produce fine wrinkles, coarse wrinkles formed at high temperature, low temperature, the formation of smaller wrinkles. 3, contact exposure Continuous tone as the film and photographic plates Yam Tightlock exposure, partly due to board the amount of light of different light-sensitive film have different degrees of hardening response, hardening due to irradiation and some become difficult to absorb the ink absorption of water they pass , graphic exposure, then from the back of a full exposure of photographic plates, so closely attached to the film version of the base.
Fourth, developing, wet processing Water on the exposed photosensitive plate imaging, were not part of the layer of light and then dissolved to water swelling, swelling by the light part of the role of small, according to the size of the film density, water absorption, high density and multi-part absorbent, and vice versa absorbent less, and the film Allow to dry naturally. To glycerol-based wetting agents, wet processing of the layout and the purpose is to enable water to adequately maintain and prevent moisture loss. 5, printing Collotype printed on special flatbed printer on the structure for the round compacted type arrangements of water by hand, inking, and put paper and ink required liquidity and smaller viscosity, water resistance of binders good pigment dispersion and the structure of easy soft, so as not to damage the plate. Dwell time was printed with black ink with the reaction roll, Cots Colored ink, as part of the layout of the absorbent layer expansion more difficult to absorb the large quantity of ink, the layout is significantly more concave Department of ink, can print a larger concentration. Printing on the environment temperature and humidity requirements more stringent.
Collotype printing products of the concentration level that can faithfully reproduce the continuous tone image, the effect can be more than offset and letterpress printing products, suitable for printing high printing compact, precisely because of this characteristic, the oldest photographic printing plate in order to maintain the continuation of this process. Collotype printed on paper in addition to outside, can also be printed on silk and silk. Since version collotype base glass, printing, and both are part and blank part of gelatin, the seal strength is not high, usually printed on a printing plate can only be about 500 to 3,000, a maximum of 5,000. Therefore, it is not urgent and high-volume printing products. More exciting, please see
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