Introduction to part of the steel coil quality problem

1. Steel Coil Quality Problem: Lateral bubbles

Characteristic

There are paintings among the two sides. After the baking, the bubbles occurs.

The causes

There are many burrs in the raw materials. It leads to the raw materials stained with paintings. And people could find the crevices among the two sides.

2.Pocking Mark

Characteristic

Sometimes, the eyewinker or dust sneaks into the coating. And people could find the thing, like small rice protrusions, on the surface.

The causes

1. There are other kinds paintings.

2. There are eyewinkers.

3. The harmful bath occurs during the pre-treating process.

4.Orange peel

Characteristic

The dry surface coatings will be like the orange zest, rough and asymmetry.

The causes

1. The wet film is too thick.

2. The viscosity is too upper.