Method for roasting surface coating of metal band

Abstract

The invention provides a method for roasting a surface coating of a metal band. The method comprises the following steps of: (1) heating the metal band by using an induction heater, wherein the heating speed is 5-10 DEG C / s, and the heating temperature is lower than 75 DEG C; and (2) drying the surface coating of the metal band by using a hot air drying system. The method can overcome the defectsof low heating speed of hot air drying and long roasting length, reduce the roasting length, improve the operation stability of the metal band, be beneficial to the uniform coating of a coating film and improve the surface quality of the metal band, and the processed film thickness uniformity is 1.0+ / -0.3g / m2. Evaporated water can be taken away by utilizing hot air blast so as to reduce the probability of water gathering and factors influencing the surface quality of the metal band, and spot defects cannot be generated on the surface of band steel because of condensed water.

Description

technical field [0001] The invention relates to the field of metal strip surface treatment, in particular, the invention relates to a method for baking a metal strip surface coating layer. Background technique [0002] In order to improve the protective effect of metal strip products such as continuous hot-dip galvanizing or electrogalvanizing, a layer of protective coating is usually applied on the surface of these metal strips. In production, the metal strip needs to be baked after being coated with a protective layer, so that the moisture in the wet coating layer on the surface of the metal strip evaporates and becomes a dry film, thereby protecting the metal strip. The coating layer referred to here includes passivation film, anti-fingerprint film, etc., mainly organic films such as resin, and these organic films are all required to be baked at high temperature (70-130°C). [0003] At present, there are mainly two baking methods for the coating layer, one is the traditi...

AI Technical Summary

Problems solved by technology

[0009] 1. The length of the baking furnace is long, the investment is large, and the stability of the operation of the metal belt in the baking furnace is reduced, which is not conducive to the uniform coating of the coating layer;

[0010] 2. The traditional hot air baking method needs to add an air / air heat exchanger in order to utilize the heat energy of the exhaust gas, which requires a large investment;

[0011] 3. The traditional induction heating baking method needs to be equipped with a large enough exhaust device to discharge the baking exhaust gas out of the induction heater, which not only requires a large investment, but also the actual use effect is not ideal

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