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A class name for various types of fibers (and filaments) produced from fiber forming processes that may be:
1) Polymers synthesized from chemical compounds, e.g. acrylic, nylon, polyester, polyethylene, polyurethane, and polyvinyl fibers.
2) Modified or transformed natural polymers, e.g. alginic, and cellulose based fibers such as acetates and rayon.
3) Minerals, e.g. glass.
The term manmade usually refers to all chemically produced fibers to distinguish them from the truly natural fibers such as cotton, wool, silk, flax etc.

Media, Medium: The materials used in filter production

Melt spinning: a nonwoven manufacturing system involving direct conversion of a polymer into continuous filaments, integrated with the conversion of the filaments into a random laid nonwoven fabric.

References for this information:

Advances in Technical Nonwovens, 2016, Pages 133-153

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