There are two common methods of coating by roller coater for Color Pre-Painted Steel Coil: smooth coating and reverse coating. When the direction of rotation of the coating roll is the same as the direction of travel of the strip
(i.e., the rotation direction of the support roller) is opposite to the reverse coating method; when the rotation direction of the coating roller is the same as the traveling direction of the strip (i.e., the support roller
The rotation direction of the roller) is the same as the smooth coating method.
During smooth coating, after the coating with the same thickness as the roll gap passes through the roll gap, it is torn with the movement of the Color Pre-Painted Steel Coil and the coating roll and is dispensed.
On the surfaces of the two rollers. The specific ratio will vary depending on the nature of the coating and the angular velocity ratio of the two rollers. but
Yes, in actual production, in order to obtain a thinner coating, the coating roll and the strip are close together without gaps. if
It is two rigid rollers; it is theoretically impossible for the coating to pass between the coating roller and the strip to be applied to the surface of the strip.
Superior. On the other hand, the coating roll can be applied to the surface of the strip with a polyurethane rubber-lined coating roll. This is also in production.
What is the reason why rubber-lined rolls must be used when rolling strip steel?
During reverse coating, the draw roller draws the paint from the paint pan, transfers it to the applicator roller, and then coats it on the surface of the strip with the applicator roller.
During operation, it can be adjusted by adjusting the rotational speed of the draw roller and the coating roller or by adjusting the gap between the draw roller and the coating roller.
The thickness of the coating film applied to the strip surface. After mechanical conditioning, the viscosity, temperature, mechanical vibration,
The fluctuation of the liquid level in the paint pan and other factors that affect the thickness of the coating film absorbed by the draw roller still exist.
The supply of paint to the roll is in a state of constant change.