Skill requirements for aluminum sheet
The basic skill requirement for the manufacture of the PS plate of the aluminum plate base is that the appearance is smooth and flat, without scratches, pits, marks, non-golden press-in, air holes, rolling strips and other apparent defects, the thickness is uniform, and the wave level is controlled. Within 1mm, the straightness is less than 2I; the structure is fine and uniform, no segregation, slag inclusion, the internal stress is divided into symmetry and uniformity; the roughness Ra value is less than 0.28, to ensure the fine and uniform electrolysis sand. At present, many of the plate-based materials used in China are 1050A, 1060 and so on.
Alkali wash
Generally, the aluminum plate supplied by the aluminum processing plant has a certain amount of oil on the outside, and the oil and the oxide film have an influence on the disposal of the sand. In the production of the PS plate, the hot alkali is used to wash the aluminum plate for external treatment.
Pickling
In the production process, after the alkali washing, there is a nitric acid pickling process, the purpose of which is to remove the residual substance after the alkali washing and neutralize the remaining alkali liquid. The mass concentration of the nitric acid solution is 5% to 10%. When preparing, carefully dilute the nitric acid into the water and mix well. In the process of pickling, the concentration of the solution should be carefully observed and compensated in time.
Roughening
The roughening is to form a sand structure with a desired roughness. The roughening can not only improve the affinity of the aluminum plate base for water, but also improve the surface wetting amount of the plate base to avoid the dirty surface; the roughened appearance can also improve the adhesion of the plate to the sensitizer, thereby improving the printing durability of the plate. force.
