In the traditional printing process, the program is indispensable, and the film plays an important role in printing. It is an indispensable link in the printing process.
So what's the film like? All kinds of printed films that we use everyday look like photographic plates, but their performance is quite different from that of photographic negatives.
Our daily contact with the film is the key component of the base, all the coatings are coated on the transparent substrate. Among them, the most important is the photosensitive emulsion layer, and the photosensitive reflection is mainly carried out on this layer. The photographic emulsion contains silver halide and sensitizer. Silver halide is the main chemical constituent of the image after exposure. The main role of sensitizer is to promote the complete reaction of light. Another important coating is the anti halo layer. This layer is mainly to prevent the exposure light from reflecting on the substrate, resulting in the two exposure of silver halide in the emulsion layer, which is very important for ensuring the quality of the exposure.
But there are many other coatings, like scratch layer is to prevent the surface of the film is hard things, but the ability of anti scratch is generally limited, just to prevent the fine dust on the surface of the film scratch. The anti oxidizing layer is to prevent the chemical reaction of the film production during the storage. Sometimes the outer layer of the film may also be added to the sand layer, which is usually used for gravure printing. All of these are in the production of coating film is a layer coated on the substrate. Of course, the coating is very thin, so that the six or seven coats after we saw the film base is still feeling.
Why is the film sensitive? This is because the film is coated with oil and photosensitive emulsion, and the emulsion is distributed with photosensitive substance - silver halide. It is also called the silver halide, halogens (chlorine, iodine, bromine) were combined with silver produced compound. Silver and chlorine combined into silver bromide, the silver bromide photographic ability the strongest, and the weakest photosensitive silver chloride. When light occurs when the silver halide decomposition, so the film will see the light after exposure, after developing, fixing after the formation of silver image.
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