[China Aluminum Industry Network] A Technical Requirements for Aluminum Bases The basic technical requirements for the production of PS plate aluminum bases are that the surface is smooth and smooth, with no scratches, pits, marks, non-aggressive pressure, pores, and rolling. Observed defects such as stripes, uniform thickness, wavy control within 1mm, flatness less than 2I; fine and uniform organization, no segregation, slag inclusion, internal stress is symmetrical, uniform; roughness Ra value is less than 0.28, in order to ensure electrolysis Fine and uniform sand. At present, China's extensive use of plate-based materials for the 1050A, 1060 and so on.
B. Alkali washing Usually, the aluminum plate provided by the aluminum processing plant has a certain amount of oil on its surface. The oil and the oxide film have an effect on the sand treatment. In the production of the PS plate, the hot alkali rinse aluminum plate is used for surface treatment.
Alkali solution is usually used to remove the oxide film and oil. Commonly used degreasing liquid ratio: NaOH, such as the quality of sodium corrosion inhibitors and sodium gluconate, fatty acid polyoxyethylene ether solubilization, complexing and other surfactants.
In addition to the oil temperature is usually controlled at about 55 ~ 60 °C, the effect of degreasing and solution temperature. If the temperature is too high, the public will severely corrode the aluminum base and must control the temperature.
Degreasing time must be determined after careful comparison. Because it is related to a variety of different production lines. The reel production line is related to the speed of the production line. Taking 4m/min as an example, the degreasing time must be up to 20s before the effect can be guaranteed.
In addition to the oil must pay attention to timely updates, because in the degreasing process will generate a large number of saponification, emulsion and aluminum salt, their presence affect the degreasing effect, and hinder the saponification and emulsification of the oil on the surface of the aluminum plate, when found to remove oil When the effect is not strong, it must be updated. Normally, if the circulation is performed by an alkaline pump, the degreasing liquid can be maintained for a long time, and if it is not recycled, the refreshing time is shortened.
The simple method of checking the degreasing effect is water. The surface of aluminum plate with good degreasing effect can evenly adhere and disperse. If the water is poured on, the surface of the aluminum plate is in the form of water droplets, indicating that the degreasing effect is not good. The temperature of the degreasing should always be taken care of. Except when the temperature of the oil is too low, the degreasing may be incomplete.
C. Pickling In the production process, after the alkali washing, there is a pickling process of nitric acid, the purpose of which is to remove the alkali-washed residual substances and neutralize the residual alkali liquor. The nitric acid solution has a mass concentration of 5% to 10%. When preparing, carefully pour the nitric acid into the water and mix thoroughly. In the pickling process should always pay attention to the concentration of the solution analysis, timely replenishment.
D Coarsening Coarsening is to form a sand head structure with the required roughness. Roughening can not only improve the affinity of aluminum substrate surface to water, increase the amount of wetted surface of the substrate, and prevent dirt on the plate surface; at the same time, the roughened surface can also increase the adhesion of the plate and the photosensitive agent, thereby improving the printing plate resistance to printing. force.
After roughening, the sand is composed of numerous convex peaks and concave valleys. Different sand-grain structures have a great influence on the adhesion of the water-retentive photosensitive layer, and have a great influence on the use of the PS plate. The characteristic parameters of the sand rough section profile curve drawn by the surface roughness tester during production are characterized.
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