Classifications of fibers Inorganic Natural asbestos Manmade glass carbon/graphite ceramIc metal
Classifications of fibers • Inorganic – Natural • asbestos – Manmade • glass • carbon/graphite • ceramic • metal
Classifications of fibers Engineered fibers Bicomponent fibers Sheath-core Side by side Island in sea(matrix fibril) · Citrus Unconventionally shaped 4DG Hollow
Classifications of fibers • Engineered fibers • Bicomponent fibers: • Sheath-core • Side by side • Island in sea (matrix fibril) • Citrus • Unconventionally shaped – 4DG – Hollow
Fibers and their properties Natural protein fibers high resilience ability to do work against restraining forces during returning from deformed state Hygroscopic or hydrophilic likes water and absorbs water High heat of wetting Most mechanical properties change when absorbing water
Fibers and their properties • Natural protein fibers – high resilience • ability to do work against restraining forces during returning from deformed state – Hygroscopic or hydrophilic • likes water and absorbs water – High heat of wetting – Most mechanical properties change when absorbing water
Fibers and their properties Natural protein fibers Harmed by alkalis, e.g. NaOh Harmed by chlorine bleach perspiration Weakened yellowed by uv light not readily flammable
Fibers and their properties • Natural protein fibers – Harmed by alkalis, e.g. NaOH – Harmed by chlorine bleach & perspiration – Weakened & yellowed by UV light – Not readily flammable
Fibers and their properties Natural cellulose fibers High moisture absorption Mechanical properties change up on water absorption Swells in water but reversible upon drying High resistance to alkaline degradation Low resilience
Fibers and their properties • Natural cellulose fibers – High moisture absorption – Mechanical properties change up on water absorption – Swells in water but reversible upon drying – High resistance to alkaline degradation – Low resilience