The blend is a term that applied to a yarn or a fabric made up of more than one fibre.
FILAMENT AND STAPLE FIBRE ILLUSTRATION
Polyolefin is a term used to describe a special type of fibre made from polymerised ethylene or propylene. Originally was Polyolefin developed for soled plastic applications
Staple fibre has short fibre, typically measured in inches or fraction of inches, like those naturally found in cotton and wool. Silk, however, is the only natural fibre that does not come in staple lengths but instead in filament lengths.
Textile Fibre Overview with links