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家电产品的表面一般均须作涂装或覆膜处理，以满足装饰性和耐腐蚀性的需要。根据涂装的先后顺序，一般分为预涂层和后涂层两种。后涂层是

最早使用，至今仍大量使用的方法，是由家电生产企业对冷轧或镀锌板原料进行加工成形后进行处理和涂装，而获得成品的方法。

预涂层正在逐步大面积使用的方法，是由钢厂对冷轧或镀锌板表面进行处理和涂装以后出厂，由家电生产企业加工、装配后直接获得成品的方法。

The surfaces of home appliances shall generally be coated or coated to meet the needs of decorative and corrosion resistance.According to the order of coating,

it is generally divided into pre-coating and post-coating.Post-coating is the earliest method used and is still widely used. It is the method of the home appliance manufacturers to process the cold rolled or galvanized plate raw materials for processing and coating, and the method to obtain the finished products.

The method of precoating is gradually being used in a large area is for the steel mill to treat and paint the cold rolled or galvanized plate surface after leaving the factory, and directly obtain the finished product after processing and assembly by the home appliance manufacturer.