A coating is a covering that is applied to the surface of an object, usually referred to as the substrate. In many cases coatings are applied to improve surface properties of the substrate, such as appearance, adhesion, wetability, corrosion resistance, wear resistance, and scratch resistance. In other cases, in particular in printing processes and semiconductor device fabrication (where the substrate is a wafer), the coating forms an essential part of the finished product.

Coating and printing processes involve the application of a thin film of functional material to a substrate, such as paper, fabric, film, foil, or sheet stock. This article discusses what is frequently termed "roll-to-roll" or "web-based" coating. A roll of substrate, when wound through the coating machine, is typically called a web.

Coatings may be applied as liquids, gases or solids. Coatings can be measured and tested for proper opacity and film thickness by using a drawdown card.

Read more about Coating:  Functions, Standards

Other articles related to "coating, coatings":

Leather Production Processes - Surface Coating
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... Lunac (alloy and trans-ceramic coatings) refers to two kinds of coating developed by the WMV laboratories ... Lunac 1 is a metallic glass coating with particularly good non-stick properties, used mainly for coating the insides of dies used in plastic molding Lunac 2 + is a very hard (up to Hv ... The coatings are fairly thick, from 50 to 250 micrometres ...
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... unalloyed chromium makes it a good surface coating, being still the most "popular" metal coating with unparalleled combined durability ... In the chromate conversion coating process, the strong oxidative properties of chromates are used to deposit a protective oxide layer on metals like aluminium, zinc ... properties by the chromate stored in the chromate conversion coating, which is able to migrate to local defects, are the benefits of this coating method ...
Curtain Coating - Process
... Curtain Coating is a process in which the object or substrate to be coated is guided through a curtain of fluid located in a gap between two conveyors ... The thickness of the coating layer that falls upon the object is mainly determined by the speed of the conveyor and the amount of material leaving the tank (Pump Speed) ... Curtain coating is a premetered method, which means that the amount of liquid required is supplying from the tank to the screen in order to be deposited on the ...

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