Spun Laid: Polymer, Polyolefin, Polypropylene Fibers

From INDA's Nonwoven Glossary:

Polymer
A liquid or solid substance made by chemically linking macromolecules together in chains. High polymer denotes substances made from very long chains. Crosslinked polymer describes a substance in which there are molecular links between chains. Polymerization is the process for making these polymers.

Polymerization
The process of changing the molecular arrangement of a compound so as to form new
compounds having the same percentage composition as the original, but of greater molecular weight and different physical properties.

Polymer laid nonwoven / Spunlaid
A method of forming a web in which a polymeric melt or solution is extruded through
spinnerets to form filaments which are laid down on a moving screen. Melt spun forming
processes include spunbond, flash spinning and melt blown. The most common polymers
used are polypropylene, polyester and polyethylene.

Polyolefin
A fiber made of long-chain polymerized olefin of at least 85% weight, from such monomers
as ethylene, propylene or other olefins.

Polypropylene fiber
A manufactured, olefin fiber made from polymers or copolymers of polypropylene. One attractive physical characteristic of polypropylene is its specific gravity of less than one, which results in a larger area volume yield per kilogram or pound of resin or staple fiber
compared to competitive fibers. Polypropylene has a relatively low melt temperature which
restrict its uses in many nonwoven markets, but it has good strength properties, softness, and chemical resistance to strong acids and alkalis. Major nonwoven markets for staple and spunlaid polypropylene include cover stock, medical apparel and related, geotextiles,
carpeting, blankets, automotive and various other durable markets.