In recent years, the application of high-pressure cleaner in the cleaning equipment of aluminium sheet and strip has been developing at a high speed in our national economy. The demand for aluminium strip and foil is increasing in aerospace, household appliances, decorative materials and beverage industries. It has brought the rapid development of PS base material, aluminium plastic strip, capacitor foil, canning material and other high-precision aluminium sheet and strip.
These products have strict requirements for flatness and cleanliness. High-precision aluminium strips are usually rolled with oil cooling and smooth rolling. There are a lot of rolling oil and aluminium powder remaining on their surface. Therefore, in order to achieve good surface quality, it is necessary to clean and remove the surface residues.
In addition, STRETCH-BEND straightening is also necessary for aluminum strips with higher shape requirements. Under the effect of STRETCH-BEND straightening, plastic extension and internal stress release gradually occur to improve the defects of waveform, warpage, lateral bending and potential bad shape during cold processing. Considering straightening process, it is necessary to clean the outer surface of strips first.
Cleaning Principle and Theory of Aluminum Plate and Strip
Cleaning Principle Aluminum plate and strip in cold rolling process, because of friction and rolling between roll and aluminium plate, fine alumina powder will fall off and adsorb on its surface. Rolling oil and its suspended components will remain on the surface of aluminium plate and strip, which will adversely affect the processing of finished products such as aluminium plate and strip compounding and coating. The tension exerted on the strip is partly transformed into the tension roll pressure of the strip due to the severe bending deformation of the strip on the roll, and eventually constitutes the friction force, which drives the roll group.
Therefore, if the strip surface is not cleaned and alumina powder falls off during deformation, X is attached to the roll surface of tension roll with oil pollution, which causes wear and tear of roll surface and slight damage of aluminium plate. Therefore, it is necessary to clean by special cleaning equipment.
Cleaning is to use pressure pump to pressurize the cleaning medium, to spray or brush the surface of the strip in a non-contact way, so that the oil pollution of the aluminum powder on the surface of the material can dissolve and fall off into the cleaning medium, and then be extruded by the extrusion roller, cleaned by high-pressure air, or even dried by high-temperature air, in order to obtain clean and dry aluminum strip.
Together, the cleaning medium is continuously compensated and used together with the online circulating filtration system to keep the cleaning medium in sufficient quantity and clean, and greatly save heat and cleaning medium. At present, the commonly used cleaning media of STRETCH-BEND Leveller in aluminum processing industry are cleaning agent (or solvent oil), softening hot water and chemical solvent, and each has its own advantages and disadvantages.
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