Unwinding, suturing, degreasing, chemical pretreatment, initial coating, initial coating, baking, initial coating, cooling, finishing, finishing, baking, finishing, cooling, inspection, inspection, and winding.
The main production processes of the color coating unit include pretreatment process, coating process and baking process.
The pretreatment process is mainly a process of pretreating a film by cleaning the surface of the substrate to remove impurities and oils, and performing composite oxidation and passivation treatment. Pretreatment of the membrane is an effective means of increasing the bonding force between the substrate and the coating.
The coating process of the color coating unit is mostly roller coating. Roll coating is a coating method in which a coating roll is used to bring a coating material in a lacquering plate to a coating roll, a wet film of a certain thickness is formed on the coating roll, and then the wet film is transferred to the surface of the steel strip. This method is fast and has high production efficiency; no paint mist is produced, and the coating efficiency is close to 100%; the adjustment of the roller gap, the pressure and the roller rotation speed can achieve the adjustment of the thickness of the coating within a certain range; It is also possible to apply both sides at the same time.
The solidification of the steel surface coating means that the coating passes through the main film-forming substance and the auxiliary film-forming substance and the patterning agent, and undergoes chemical polycondensation, polyaddition, cross-linking and the like under a certain temperature and other conditions, and changes from a liquid state to a solid state. process. The Baosteel color coating unit uses a 5-stage hot air method to indirectly heat the steel plate to promote the rapid solidification of the coating into a film. The solvent precipitated during the nationalization of the coating is discharged after high temperature incineration to avoid environmental pollution.