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Nonwoven fabrics are broadly defined as sheet or web structures bonded together by mechanical entanglement, chemical, thermal, or other means. Unlike traditional fabrics, the fibers are not first converted to yarn and then woven or knitted into a fabric. Instead, a porous sheet or web is made directly from separate fibers. The process of manufacturing nonwovens is made up of two basic steps; 1) web forming, where loose fibers are laid out on a moving porous belt, or drums to create a uniform sheet, and 2) web bonding, where an adhesive or entanglement process is applied to bond the laid out fibers together to create a stable web, or sheet, of material. This course covers some of the different web bonding processes which are used.
