1. Each film (including color film) includes two basic components: a monolayer or multilayer emulsion layer, a photosensitive emulsion layer support substrate. Emulsions are made of light sensitive fine particles suspended in a gelatin medium. Gelatin on the film is similar to that of some food.
2 in the photosensitive material is suspended in gelatin silver halide grains. The particles are so tiny that it can be observed only under high magnification. In the 1 square inch usually light-sensitive photographic emulsion and silver halide crystal content of approximately 400 million of the silver halide crystal has a upon exposure to the structure change of the characteristics. The mechanism of this change is not important for us, the end effect is the most important. How does this change? When you shoot, light through the lens of the camera to shoot the film emulsion layer, when the light reaches the silver halide crystals, the crystal occurred structural changes, and with neighboring by light irradiation of the silver halide crystal mutual coalescence up.
3 for the silver halide crystal coalescence and the formation of the mass is still very fine. Emulsion layer to receive the amount of light more, more crystal coalescence together, light is less and less, changes in the crystal and coalescence and fewer. There is no change in the crystal and the coalescence of the crystals without light. That is to say, the different intensity of light exposure to film, the film on the micro area of the emulsion layer on a different number of crystal structure changes and mutual coalescence.
The 4 film was exposed, immediately produce a latent image -- an invisible image. The film must be developing operation to the latent image into visible image of the firm. When the film development and structure has undergone changes of halogenated silver turned black metallic silver particles coalescence of the body, resulting in a negative image. Film that are not sensitive to light, that is, there is no crystal structure change is a called fixer chemicals to wash away, so that some of these presented grayish or transparent. Results are negative dark (thick) is part of the exposure part of the larger; bright (thin) is part of the exposure part of the less; transparent part is not affected by light irradiation. This is a black and white film to record the basic process.
5. Color film with three layers of emulsion layer, in the emulsion layer also contains different can generate the dye organic compounds, called color coupler (coupler). They are colorless, but in color development when coupled with the oxide color developer into colored dyes. For the negative film, contained in the upper color blindness emulsion and coupling agent in the color development form yellow, middle shaped product red, the lower the formation of blue, this is we get of after processed photographic colour films.
6. Through enlarging or amplifying the image onto photographic paper or was flush with the reversal reversal film, the upper film change yellow as its complementary color blue, middle layer turns green, the lower is red, we get the color photographs and natural state or transparent reversal film. This is the basic process of color film recording image.
PVC is actually a kind of vinyl polymer material, the material is a kind of non crystalline material. PVC materials in practical use is often added stabilizer, lubricant, auxiliary processing agent, pigment, anti impact modifier and other additives. Is not flammable, high strength, excellent resistance to climate variability and geometric stability. PVC had strong resistance to oxidant, reductant and acid. However, it can be oxidized by concentrated sulfuric acid, such as concentrated sulfuric acid, concentrated nitric acid and can not be used in contact with aromatic hydrocarbons and chlorinated hydrocarbons.
PVC film materials use very wide, has good processing performance, low manufacturing cost, corrosion resistance, insulation, and other good characteristics, mainly used in the production of: pravin PVC card; OEM PVC; PVC wire, PVC curtain, PVC coated welded wire mesh; PVC foam board, PVC ceiling, PVC pipes, PVC baseboard and other and threading pipe, cable insulation, plastic doors and windows, plastic bags and other aspects. In our daily life can be seen everywhere PVC products. PVC is used to make all kinds of leather, for luggage, sports products, such as basketball, football and football. Can also be used to produce uniforms and special protective equipment for the belt.
