[China Aluminum Network] aluminum base surface disposal

A skills demand for aluminum base

The basic skills required for the manufacture of PS plate aluminum bases are the appearance of smooth, flat, scratch-free scratches, craters, imprints, non-metal squeezing, air holes, rolling strips, and other apparent defects, consistent thickness, and wave degree control Within 1mm, the straightness is less than 2I; the organization is fine and uniform, there is no segregation, slag inclusion, the internal stress is symmetrical and uniform; the roughness Ra value is less than 0.28 to ensure the fine and uniform electrolytic sand. At present, many of the plate-based materials used in China are 1050A and 1060.

B alkaline wash

In general, the aluminum sheet supplied by the aluminum processing plant has a certain amount of oil on its outer surface, and the oil and the oxide film have an effect on the disposal of the sand head. In the production of the PS plate, the hot alkali is used to scour the aluminum sheet for external disposal.

Alkali solution is generally 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 solubilizing, complexing and other external active agents.

In addition to the oil temperature is generally controlled at about 55 ~ 60 °C, the role of oil removal and the temperature of the solution. If the temperature is too high, the public will severely corrode the aluminum base, so it is necessary to manipulate the temperature.

It is necessary to determine the timing of the demolition by carefully checking the comparison. Because, it is related to a variety of different production lines. The production line of the reel is related to the speed of the production line. Taking 4m/min as an example, it is necessary to remove the oil until 20s, and its role can be ensured.

In addition to the oil, it is necessary to pay attention to the timely renewal. Since many saponifications, emulsions and aluminum salts are generated during the degreasing process, their presence affects the degreasing effect and prevents the saponification and emulsification of the oil on the surface of the aluminum plate. When the effect of oil is not strong, it is necessary to update it in a timely manner. In general, when the circulation is performed by the alkali pump, the degreasing liquid can maintain a longer time, and if it does not, the update time is shortened.

See the simpler method of degreasing is water. The deoiling aluminum plate surface water can evenly adhere to loose water. If the water is poured on the surface of the aluminum plate, it will show a dewetting effect. The temperature of the degreasing should be always paid attention to. If the temperature of the oil is too low, the degreasing can be incomplete.

C pickling

In the production process, after the alkali washing, there is a nitric acid washing process, the purpose of which is to remove the residual substances after the alkali washing and neutralize the remaining alkali liquor. The nitric acid solution has a mass concentration of 5% to 10%. Careful attention should be paid when formulating the nitrates into the water and mix thoroughly. In the pickling process should always pay attention to the concentration of the solution analysis, make up in time.

D roughening

The roughening is to form a sand head structure having a required roughness. Coarsening can not only improve the affinity of the aluminum substrate surface to water, but also increase the amount of surface moisture on the substrate to avoid dirt on the surface of the plate; the appearance after the roughening can also improve the adhesion of the printing plate with the photosensitive agent, thereby improving the printing plate's resistance to printing. force.

After roughening, the sand is composed of numerous convex peaks and concave valleys. The different sand textures 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 produced by the top surface roughness tester were characterized.

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