(a) A number of fibers twisted together.
(b) A number of filaments laid together without twist.
(c) A number of filaments laid together with more or less twist.
(d) A single mono filament. E.g . Silk
TYPES OF YARNS:
Yarns can be made either from short staple length fibers or from filament fibers. There are two types of yarns, i.e., spun yarns and filamentous yarns.
Textured” is a general term for any continuous filament yarn whose smooth straight fibers have been displaced from their closely packed, parallel position by the introduction of some form of crimp, curl, loop or coil.
Textured yarns can be made from either filament fibers or staple fibers cut from filaments that have been given a textured configuration of some type. The majority of textured yarns are made from filament fibers. Texturizing occurs following the spinning of the fiber material through the spinneret. It may be done immediately following fiber formation and be a part of a continuous operation or it may be done some time after the filaments have been made. There are three types of textured yarns. 1. Bulk textured yarns 2. Stretch textured yarns 3. ‘Set-modified stretch textured yarns.
Novelty yarns are made primarily for their appearance. They differ from simple yarns that their structure is characterized by irregularities. ASTM defines a fancy yarn as a yarn that differs significantly from the normal appearance of single or plied yarns due to the presence of irregularities deliberately produced during its formation.
In single yarn the irregularities may be due to the inclusion of knots, loops, curls, slubs and the like. In plied yarns the irregularities may be due to a variable delivery of one or more of its components or to twisting together dissimilar single yarns. The term fancy, complex and novelty are considered synonymous. As noted from the definition most fancy yarns are either single or plied. There can be endless variety of novelty yarns. A typical novelty yarn has three basic parts: 1.The ground or foundation or core. 2. The fancy or effect 3. The binder.