Before coiling, some pretreatment should be done to ensure that the coiling surface is clean. Avoid the influence of residual grease and lubricant on the surface and use of the coating. Therefore, the pretreatment of aluminium coil before forming should be carried out in the following aspects.
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First, hot water can be used to clean the rolls. Hot water cleaning is mainly to clean the degreaser residues on the surface of the matrix to ensure that these residues can be dissolved in it and prevent the secondary pollution of these degreasers to the matrix. The main usage methods are soaking and spraying. The hardness of water should not be too high, otherwise minerals in water will form mineral spots on the surface of matrix.
Secondly, due to the high speed of the pre-coating line, the degreaser used for hot alkali degreasing is usually of high concentration. Typical degreasers include sodium hydroxide (NaOH), sodium carbonate (Na2Co3), sodium silicate (Na2SiO 3), phosphate and other components. Hot alkali degreasing process is usually carried out in two steps to ensure the surface cleanliness of aluminium coil substrate. The commonly used method is spraying method.
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Finally, it is passivated. Passivation process is to make the passivator form a conversion film on the surface of the substrate by pressure spraying, impregnation coating or roll coating. Generally, pressurized spray method is adopted. The sludge generated during the use of the passivation fluid will jam the nozzle orifice, thus affecting the spray effect. Although the dipping method solves this problem, the consumption of passivation solution is large. The above two methods need to use water to clean excessive passivation liquid in practical operation, which will cause the problem of waste water recovery and purification. Roller coating is the best passivation method, which has the advantages of uniform coating, economical and practical, and no leaching. Chromate/oxidized primer is a common primer for aluminium plate. It contains chromate, chromate, phosphoric acid, accelerator fluoride and molybdate. Phosphoric acid must be added to this kind of treatment agent, otherwise it can not be used in the treatment of food and beverage aluminium sheet.
In the past year, China's aluminium coil product market is gradually improving, color aluminium coil has been growing steadily. The application of aluminium coil in electronics, packaging, construction, machinery, etc. In the past 2012, many shells or plastics of traditional electronic equipment may be much cheaper, but life is short and the shell is easy to be damaged. Therefore, the future development of SinoAluminum Volume can also occupy the market. Aluminum coil manufacturers will gradually increase, and the competition of products will ultimately be attributed to technology competition and brand competition.
From the whole market, people's demand for high-end products is still increasing, which is very resistant to counterfeit and inferior products. Aluminum coil will also become part of our products, which makes our products more beautiful and high-end.
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