Color steel coil because of the color, good color, by the public, sometimes will find that there will be pressure spots on the material, what is the reason? Next, let's analyze it together.

Compared with the construction plate, the substrate used for the color coated board of household appliances has higher elongation, yield ratio and corresponding R value and N value; And the adhesion between the paint film and the substrate is required to be strong, the coating has a certain flexibility, the corresponding hardness is low, the surface of the color-coated plate coil for household appliances often appears - defect when shearing and uncoiling, this defect is that the color-coated plate coating is slightly deformed due to the coiling tension when baking, cooling, and coiling, sometimes the surface is rough, showing a visible speckle form, and the slight point defect will gradually disappear with the extension of the storage time of the steel plate, and it can be eliminated by heating, however, even if the above measures are taken, Serious point defects cannot be eliminated and thus affect the user's use.

Color steel rolling spot is a kind of defect produced in the production process, if you look for the cause and influencing factors of this defect in the production process, you need to stop for inspection, affect the production plan, increase the production cost, therefore, it is necessary to simulate, reproduce and evaluate this defect in the laboratory, find out the cause and influencing factors of this defect from all aspects.

In short, in order to avoid the problem of speckle pressure on the surface of color steel coil in production, we must strictly treat every detail in product production, do a good job in the regular maintenance of production equipment, and effectively reduce speckle.

The color steel coils sold on the market, some of the color steel coils are shiny, some reach the due gloss or uneven color, or the coating is cured for a few hours, or the gloss decreases and falls off after use, what is the reason for this?

1. Check whether the fineness of the coating on the computer meets the process requirements.

2. The paint should be fully mixed and filtered before using the computer, and the thinner should not be added too much.

3. Control the humidity of the roller coating chamber to prevent water from mixing into the paint.

4. Check whether the thinner matches the coating, and the thickness of the wet film of the topcoat should not be too thin.

The way to solve the matte surface of the color roller is to reasonably set the temperature of each section of the curing oven to avoid being too high or too low.

The quality standard of the color roll has four layers of treatment on the front and back, so what are its raw material requirements?

(1) Use aluminum-zinc alloy as the base layer;

(2) Chemical coating treatment;

(3) Coating epoxy resin primer;

(4) Paint the surface.

Sliding iron sheet holder for cold bridge: the upper part is a 2mm thick aluminum-magnesium-zinc alloy plate and iron sheet, the lower part is a 3mm thick aluminum-magnesium-zinc alloy plate and iron sheet, and the middle part is a polymer rubber ring for cold bridge breaking, and the aluminum-magnesium-zinc bolt connection combination.