Latest products
What are the commonly used process methods in the pretreatment of packaging steel strips?
by：Hongmei
2021-03-15
What are the commonly used process methods in the pretreatment of packaging steel strips?
(1) Spray soak cleaning. Spray degreasing liquid on the surface of the steel strip or soak the steel strip in the degreasing liquid, and use the degreasing agent to wet, penetrate, emulsify and disperse the grease on the surface of the steel strip to remove the grease on the surface of the steel strip. It is mainly used for the steel strip. Pre-cleaning.
(2) lye scouring and cleaning. The method of spraying high-pressure degreasing liquid on the surface of the steel strip, or spraying the degreasing liquid and brushing the roller at the same time, exerts an external force on the grease on the surface of the steel strip to remove the grease and dirt through a mechanical way. It is mainly used to remove large areas of oil stains after pre-cleaning.
(3) Electrolytic cleaning. By applying an electric field near the steel strip, the steel strip is polarized and charged, or the steel strip is directly charged, so that the electrolyte on the surface of the steel strip produces an electrolytic reaction, and the tiny bubbles of hydrogen and oxygen are generated on the surface of the steel strip, thereby making grease Peel off with the steel strip. It is mainly used for cleaning after large-area oil stain removal, to remove stubborn oil stains in small pits on the surface of the steel strip.
(4) Ultrasonic cleaning. The cleaning medium around the steel belt is vibrated under the action of a strong sound field, and the dirt on the surface of the steel belt is removed by its unique cavitation, scouring and stirring effects. At present, there are not many galvanizing lines, which are mainly used to remove iron powder, rust and other dirt on the surface of the steel strip.
(5) Rinse and clean with clean water. Spray high-pressure clean water on the surface of the steel strip, or use a brush roller while spraying water to remove the residual alkali stains on the surface of the steel strip during the cleaning process of the degreasing agent, so as to eliminate the secondary pollution caused by the cleaning process. Mainly used for alkaline stain cleaning in pre-treatment.
can be seen from the above; each cleaning method has its own merits. In fact, it is impossible for any production line to use only a certain cleaning method, but to combine the above methods to learn from each other and achieve the best results.
Generally speaking, pre-cleaning soaking and final flushing with water are indispensable, and the intermediate oil removal can be done by brushing, electrolysis, or both. Someone compared the cleaning effects of the above several cleaning methods and combinations, and considered the order of the cleaning effects.
is arranged according to the effect of removing grease on the surface of the steel strip: soaking + brushing + electrolysis> soaking + brushing> soaking + electrolysis> electrolysis> brushing> soaking.
is arranged according to the effect of removing residual iron powder on the surface of the steel strip: soak + brush + electrolysis> soak + electrolysis> soak + brush> electrolysis> brush> soak.
(1) Spray soak cleaning. Spray degreasing liquid on the surface of the steel strip or soak the steel strip in the degreasing liquid, and use the degreasing agent to wet, penetrate, emulsify and disperse the grease on the surface of the steel strip to remove the grease on the surface of the steel strip. It is mainly used for the steel strip. Pre-cleaning.
(2) lye scouring and cleaning. The method of spraying high-pressure degreasing liquid on the surface of the steel strip, or spraying the degreasing liquid and brushing the roller at the same time, exerts an external force on the grease on the surface of the steel strip to remove the grease and dirt through a mechanical way. It is mainly used to remove large areas of oil stains after pre-cleaning.
(3) Electrolytic cleaning. By applying an electric field near the steel strip, the steel strip is polarized and charged, or the steel strip is directly charged, so that the electrolyte on the surface of the steel strip produces an electrolytic reaction, and the tiny bubbles of hydrogen and oxygen are generated on the surface of the steel strip, thereby making grease Peel off with the steel strip. It is mainly used for cleaning after large-area oil stain removal, to remove stubborn oil stains in small pits on the surface of the steel strip.
(4) Ultrasonic cleaning. The cleaning medium around the steel belt is vibrated under the action of a strong sound field, and the dirt on the surface of the steel belt is removed by its unique cavitation, scouring and stirring effects. At present, there are not many galvanizing lines, which are mainly used to remove iron powder, rust and other dirt on the surface of the steel strip.
(5) Rinse and clean with clean water. Spray high-pressure clean water on the surface of the steel strip, or use a brush roller while spraying water to remove the residual alkali stains on the surface of the steel strip during the cleaning process of the degreasing agent, so as to eliminate the secondary pollution caused by the cleaning process. Mainly used for alkaline stain cleaning in pre-treatment.
can be seen from the above; each cleaning method has its own merits. In fact, it is impossible for any production line to use only a certain cleaning method, but to combine the above methods to learn from each other and achieve the best results.
Generally speaking, pre-cleaning soaking and final flushing with water are indispensable, and the intermediate oil removal can be done by brushing, electrolysis, or both. Someone compared the cleaning effects of the above several cleaning methods and combinations, and considered the order of the cleaning effects.
is arranged according to the effect of removing grease on the surface of the steel strip: soaking + brushing + electrolysis> soaking + brushing> soaking + electrolysis> electrolysis> brushing> soaking.
is arranged according to the effect of removing residual iron powder on the surface of the steel strip: soak + brush + electrolysis> soak + electrolysis> soak + brush> electrolysis> brush> soak.
