Weft Pile Fabrics
In pile fabrics, a proportion of the threads, either warp or weft, are made to project at right angles from a foundation texture and form a pile on the surface.
The projecting threads may be cut or uncut thus resulting in tufted or looped pile.
Weft pile fabrics are composed of one series of warp threads and two series of weft threads, the ground and the pile.
The pile weft is cut in a separate operation after weaving resulting in a surface consisting of short and very dense tufts.
In weft pile structures, also known as velveteens is very high density of picks, which may reach to 200 picks per centimeters.
The pile effect in the velveteen is not produced during weaving but is a result of a cutting operation during cloth finishing.
The structure is so arranged that the surface of the cloth is covered by weft floats.
These floats are then severed by knife action and form a cut pile surface.
The ground cloth, usually plain or twill is unaffected by the knife action and forms a solid base from which the cut tufts project and in which they are anchored.
Structurally velveteens are of four types:
a. All over or plain velveteen in which the surface is uniformly covered by the pile.
b. Weft Plushes: Similar to above but arranged to produce much longer floats.
c. Corded velveteens: Also known as Corduroys and fustions in which the pile runs in orderly vertical cords of varying width.
d. Figured Velveteens: in which pile figure is produced on base ground.