1、 Color board production process flow

彩色涂层钢板是以冷轧钢板和镀锌钢板为基板，经过表面预处理(脱脂、清洗、化学转化处理)，以连续的方法涂上涂料(辊涂法)，经过烘烤和冷却而制成的产品。

Color coated steel plate is a product made from cold-rolled and galvanized steel plates, which undergo surface pretreatment (degreasing, cleaning, chemical conversion treatment), continuous coating (roller coating method), baking, and cooling.

常见的二涂二烘型连续彩色涂层机组工艺流程主要生产工序为：开卷→预处理→涂敷→烘烤→后处理→卷取。

The main production process of the common two coating and two drying type continuous color coating unit is: uncoiling → pre-treatment → coating → baking → post treatment → coiling.

彩色涂层钢板的涂层结构

Coating structure of color coated steel plate

双面二涂二烘彩色涂层钢板的涂层，如下图所示

The coating of double-sided two coated and two baked color coated steel plate is shown in the following figure

上表面二涂二洪，下表面涂一层的彩色涂层钢板的涂层， 如左图所示 (此类背面漆一般不宜当正面使用

Apply two coats of paint on the upper surface and one layer of colored coating on the lower surface of the steel plate, as shown in the left figure (this type of back paint is generally not suitable for use on the front side

彩色涂层钢板是以冷轧钢板，电镀锌钢板、热镀锌钢板或镀铝锌钢板为基板经过表面脱脂、磷化、铬酸盐处理后，涂上有机涂料经烘烤而制成的产品。彩色涂层钢板的常用涂料是聚酯(BHP XRW涂覆系统，宝钢JZ，韩国PGS，台湾PE )，其次还有硅性树酯(PSS)，氟树脂(PVDF)等，涂层结构分二涂一烘和二涂二烘，涂层厚度一般在表面20-25μ，背面8-10μ。彩色涂层钢板通常引用的标准是美国ASTM A527(镀锌)、ASTM AT92 (镀铝锌)，日本JIS G3302，欧洲EN/0142，韩国KS D3506，宝钢Q/BQB420。

Color coated steel plate is a product made from cold-rolled steel plate, electrogalvanized steel plate, hot-dip galvanized steel plate, or aluminum zinc plated steel plate as the substrate, which is degreased, phosphated, chromated on the surface, coated with organic paint, and baked. The commonly used coatings for color coated steel plates are polyester (BHP XRW coating system, Baosteel JZ, South Korea PGS, Taiwan PE), followed by silicone resin (PSS), fluororesin (PVDF), etc. The coating structure is divided into two coatings, one drying and two drying, with a coating thickness generally ranging from 20 to 25 on the surface μ， Back 8-10 μ。 The standards commonly cited for color coated steel plates are ASTM A527 (galvanized) and ASTM AT92 (aluminum zinc plated) in the United States, JIS G3302 in Japan, EN/0142 in Europe, KS D3506 in Korea, and Q/BQB420 in Baosteel.

二、彩色涂层钢板的涂料种类

2、 Types of Coatings for Color Coated Steel Plates

彩色涂层钢板用涂料一般根据用途分为两大类：即建筑用和家电用。建筑用涂料根据使用环境的不同，在环氧树脂、聚酯树脂、聚氯乙烯塑料溶胶、硅改性聚酯和聚偏氟乙烯中选择。家电用涂料一般采用聚酯树脂。彩色涂层钢板的涂料包括底漆、面漆和背面漆。

The coatings used for color coated steel plates are generally divided into two categories based on their use: for construction and for household appliances. Architectural coatings are selected from epoxy resin, polyester resin, polyvinyl chloride plastic sol, silicon modified polyester, and polyvinylidene fluoride according to the different usage environments. Coatings for household appliances generally use polyester resin. The coatings for color coated steel plates include primer, topcoat, and back coat.

1. 底漆种类和膜厚

1. Primer type and film thickness

底漆有环氧树脂、聚酯树脂、丙烯酸树脂和聚氨酯树脂四类。一般根据产品的用途、使用场合、加工程度，以及与面漆的配套来选择底漆。底漆的膜厚通常为5μm。

There are four types of primers: epoxy resin, polyester resin, acrylic resin, and polyurethane resin. Primers are generally selected based on the product's purpose, usage, degree of processing, and compatibility with the topcoat. The film thickness of the primer is usually 5 μ M.

(1) 环氧底漆

(1) Epoxy primer

与基材的附着力良好、耐水、耐碱、抗化学腐蚀性好，是更早的卷材用底漆，柔韧性能不如其它底漆。

It has good adhesion to the substrate, water resistance, alkali resistance, and chemical corrosion resistance, making it the earliest primer for coil materials. Its flexibility is not as good as other primers.

(2) 聚酯底漆

(2) Polyester primer

(3) 对基材的附着力好、柔韧性优异，对潮湿的环境较敏感、耐化学药品

(3) Good adhesion to substrate, excellent flexibility, sensitive to humid environments, and resistant to chemicals

性不如环氧底漆。

Not as good as epoxy primer.

(4) 水溶性丙烯酸底漆

(4) Water soluble acrylic primer

(5) 对基材的附着力良好，很好的柔韧性、有机溶剂含量低、低温固化、不宜在潮湿的环境中储存，对预处理要求高。

(5) Good adhesion to the substrate, good flexibility, low organic solvent content, low temperature curing, unsuitable for storage in humid environments, and high requirements for pre-treatment.

(6) 聚氨酯底漆

(6) Polyurethane primer

(7) 具有耐化学药品性、耐磨擦性、耐久性、柔韧性好。

(7) It has chemical resistance, abrasion resistance, durability, and good flexibility.

2. 面漆种类和膜厚

2. Type of topcoat and film thickness

更常用的面漆有聚酯、硅改性聚酯、聚氯乙烯塑料溶胶和聚偏氟乙烯等。

The most commonly used topcoats include polyester, silicon modified polyester, polyvinyl chloride plastic sol, and polyvinylidene fluoride.

(1) 聚酯聚酯(PE)附着力好，在成型性和室外耐久性方面范围较宽，耐化学药品性中等。

(1) Polyester polyester (PE) has good adhesion, a wide range of formability and outdoor durability, and moderate chemical resistance.

3、高耐候聚酯(HDP)抗紫外线性优良，具有很高的耐久性，其主要性能介于聚酯和氟碳之间。

3. High weather resistant polyester (HDP) has excellent UV resistance and high durability, with its main performance between polyester and fluorocarbon.

4、聚偏氟乙烯(PVDF)具有良好的成型性和颜色保持性、优良的室外耐久性和抗粉化性、抗溶剂性，颜色有限。

4. Polyvinylidene fluoride (PVDF) has good formability and color retention, excellent outdoor durability, powdering resistance, solvent resistance, and limited color.

(2)硅改性聚酯

(2) Silicone modified polyester

硅改性聚酯(SMP)涂膜的硬度、耐磨性和耐热性良好，以及良好的外部耐久性和抗粉化性，光泽保持性和柔韧性有限。涂膜的硬度、耐磨性和耐热型良好;以及良好的外部耐久性和不粉化性、光泽保持性和柔韧性有限、成本中到高。

The hardness, wear resistance, and heat resistance of silicon modified polyester (SMP) coating are good, as well as good external durability and powdering resistance. The gloss retention and flexibility are limited. The hardness, wear resistance, and heat resistance of the coating film are good; And good external durability and non powdering, limited gloss retention and flexibility, medium to high cost.

(3)聚偏氟乙烯

(3) Polyvinylidene fluoride

具有良好的成型性和颜色保持性、优良的室外耐久性和抗粉化性、抗溶剂性、颜色有限、贵。

It has good formability and color retention, excellent outdoor durability and powdering resistance, solvent resistance, limited color, and high price.

(4)聚氯乙烯塑料溶胶

(4) PVC plastic sol

优良的外部耐久性和抗化学药品性、抗损坏性、美观、需特制底漆配套。表面可以有光滑型，用于压花或自动收缩型形成花纹。涂层厚度一般大于100μm。 除塑料溶胶外，一般情况下，底漆加面漆的涂层厚度≥20μm，其产品各项性能可达到预定的目的。

Excellent external durability, chemical resistance, damage resistance, aesthetics, and the need for special primer matching. The surface can have a smooth shape, used for embossing or automatic shrinkage to form patterns. The coating thickness is generally greater than 100 μ M. Except for plastic sol, in general, the coating thickness of primer and topcoat is ≥ 20 μ m. The performance of its products can achieve the predetermined goals.

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