Packaging steel strip is commonly used in pretreatment process method have?

Packaging steel strip is commonly used in pretreatment process method have? ( 1) Soak cleaning spray. To the steel strip surface spray degreaser or soaked the steel belt in degreaser, using oil degreasing agent for steel strip surface wetting, penetration, emulsifying and dispersing effect, remove grease on the surface of the steel belt, is mainly used for pre-cleaning of steel belt. ( 2) Alkali scour to clean. Adopts the steel strip surface spraying high pressure degreaser, or at the same time of spray degreasing fluid to scrub brush roller, the method of grease applying force on the surface of the steel strip for by mechanical means make the grease and dirt removing. Mainly used for large area of the oil removal in the process of the after cleaning. ( 3) Electrolytic cleaning. Through applying an electric field near the steel strip, steel strip polarization charged, or directly use steel with electric method, make the electrolyte on the surface of the steel belt produces electrolytic reaction, on steel strip surface tiny bubbles of hydrogen and oxygen, so that the oil and steel tape stripping removal. It is mainly used for large area of the oil removal after cleaning, remove the steel strip surface small stubborn stains in the pits. ( 4) Ultrasonic cleaning. Make the cleaning medium around the strip in the sound field under the action of strong vibration, using its unique cavitation, flashing, mixing function remove dirt on the surface of the steel belt. At present, there are few used in the galvanizing line and is mainly used for removing iron powder, rust and other contaminants on the surface of the steel belt. ( 5) Water scour to clean. To the steel strip surface high pressure water injection, or in the water at the same time to scrub brush roller, remove the steel strip surface residual alkali in the process of degreasing agent to clean stains, to eliminate the secondary pollution caused by the cleaning process. Mainly used for the pretreatment of alkaline stain cleaning. By the visible; Each has his strong point, all kinds of cleaning method. In fact, any one production line can not only use a certain kind of cleaning method, but the above methods together, complement each other, obtain the best effect. Generally, soaking in the process of the cleaning and the final water flush is indispensable, and in the middle of the oil removal can be used in a scrub, one of the electrolysis, or using two methods at the same time. Some of the above several kinds of cleaning methods and combination of cleaning effect, the comparison of that the order of the cleaning effect. By removing the effect of the steel strip surface grease: soaking scrub + + scrub + electrolytic > immersing the scrub + electrolytic electrolytic > > > immersing > soaking. By removing the effect of the steel strip surface residual iron powder: soak the scrub + + electrolytic > soaking scrub + + electrolytic > immersing > > scrub > soaking electrolysis.