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Nonwoven web formation is accomplished using one of three general methods. One, dry-laid. In this process, raw fibers are mechanically aligned, and then laid out. Or they are dispersed into an air stream and collected on a belt to create a sheet. When air is used, the process is referred to as air-laid. Two, wet-laid. A suspension of raw fibers in water is deposited on a porous belt to create a sheet. Three, spun-melt. In this process, polymer is melted and extruded to create filaments, which are then directly laid onto a belt to create a sheet. The two most common variants of this method are spun-bonding and melt-blowing.