彩涂镀锌板表面划伤的原因

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彩涂镀锌板因运输和人为施工可能会产生表面划痕。划痕属于缺陷产品，使用时会受到影响。因此，应注意划痕产生的原因，及时预防。

1。基板划痕
2。制作单板时，注意单板背面的划痕，造成色差，背面颜色偏浅，容易产生色差。
3。喷管刮伤（主要在带钢前部）。
4。入口段：导板（主后）划伤。
5。凝固炉划痕：炉体内有下垂物（常见）；前划痕张力过大，主要指厚料变薄时张力过大。
6。停车或卸货时，出口活套上的划痕很常见。
7。挤压机辊上的刮痕，通常在挤压机辊不旋转时出现。
8。出口段有异物刮伤，出口导板有异物，彩涂镀锌板表面有多指背或剪刀刮伤。
9.S辊划伤，水冷挤压效果不好，给S辊带水，炉体与出口活套张力相差过大，导致S辊打滑。
10。固化炉板初温不够，涂料固化不好，稳定辊在水冷前将涂料粘回原位。
2。确定划痕的具体位置
1。第一步是确定涂抹前后的划痕。
2。干燥前或干燥后刮伤。

使用和安装彩涂镀锌板时，应注意正确的安装方法，固定板材，防止设备意外划伤。

Coloured galvanized sheet may have surface scratches due to transportation and man-made construction. The scratches belong to defective products and will be affected when used. Therefore, we should pay attention to the causes of scratches and prevent them in time.

1. Substrate scratches

2. When making veneer, pay attention to the scratch on the back of the veneer, which causes color difference, light color on the back, and easy to produce color difference.

3. Scratch of spray pipe (mainly on the front of strip).

4. Entrance section: scratch of guide plate (main back).

5. Scratches in solidification furnace: sagging objects in furnace body (common); front scratches with excessive tension, mainly referring to excessive tension when thick material is changed into thin material.

6. Scratches on exit loopers are common when parking or unloading.

7. Scratches on extruder rolls, usually when the extruder rolls do not rotate.

8. Foreign body scratches in the exit section, foreign body on the exit guide plate, multi-finger back or scissors scratches on the surface of color-coated galvanized sheet.

9.S roll scratches, water-cooled extrusion effect is not good, bring water to S roll, the tension of furnace body and outlet looper is too different, resulting in S roll skidding.

10. Initial temperature of solidification furnace plate is not enough, paint solidification is not good, stabilization roll sticks back paint before water cooling.

2. Determining the specific site of the scratch

1. The first step is to determine the scratch before and after application.

2. Scratch before drying or after drying.

The above-mentioned reasons for scratches on color-coated galvanized sheet are introduced in the hope of giving you help. When using and installing the sheet, we should pay attention to the correct installation method, fix the sheet, and prevent accidental scratches by the equipment.