Paint coatings continued coil metal

Coil coating n. FFigh-speed process, which applies paint and other coatings to a continuous flat coil of metal. A continuous coil of metal is unwound, cleaned, surface-treated, coated, heat-cured, cooled and rewound in one operation. The coated coil is subsequently unwound and formed into any number of products, such as house siding, Venetian blinds, and automotive and appliance parts. 

In the coating of continuous metal coils, reverse roller coating is often used. In this technique the web is moving counter to the application roller direction, so that the paint is partly wiped off by the moving coil. Shear leads to better flowout. Another type of reverse roller coating is used for the application of stiff paste fillers to chipboard. Application is by forward roller, but this is immediately followed by a reverse roller, which presses the filler into the board and doctors it smooth. 

Coil coating is an advanced technique for applying organic coatings as a liquid or film to sheet metal in a continuous process. This process is also referred to as pre-coated, pre-painted or pre-finished. The technology is based on the simple fact that it is easier to coat a flat surface, than paint individual irregular shapes after they have been formed. 

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