Classification of Yarn | Classification of Yarn According to Yarn Structure | Classification of Yarn According to Their Use

Classification of Yarn:
Classification of Yarn According to Yarn Structure:
Yarns may be divided into three types according to their structure as follows:

1. Staple Fiber Yarns or Spun Yarns(single yarn):
Spun yarns are made by mechanical assembly and twisting together(spinning) of staple fibers. Ring spinning, Rotor spinning, Wrap spinning, Air-jet spinning etc. machines are used to produced this spun or single yarns.

2. Ply Yarn:
Single yarns are used in the majority of fabrics for normal textile and clothing applications, but in order to obtain special yarn features, particularly high strength and modulus for technical and industrial applications, ply yarns are often needed. A folded  or ply yarn is produced by twisting two or more single yarns together in one operation, and a cabled yarn is formed by twisting together two or more folded yarns or a combination of folded and single yarns. The twisting together of several single yarns. 
Fly yarn
Increases the tenacity of the yarn by improving the binding-in of the fibers on the outer layers of the component single yarns. Ply yarns are also more regular, smoother and more hard wearing. The direction of twisting is designated as S or Z, just as in single yarns. Normally the folding twist is in the opposite direction to that of the single yarns.

3. Filament Yarns:
A filament yarn is made from one or more continuous strands called filaments where each component filament runs the whole length of the yarn. Those yarns composed of one filament are called monofilament yarns, and those containing more filaments are known as multifilament yarns. For apparel applications ,a multifilament yarn may contain as few as two or three filaments or as many as 50 filaments. In carpeting, for example, a filament yarn could consist of hundreds of filaments, Most manufactured fibers have been produced in the form of a filament yarn. Silk is the only major natural filament yarn.
Filament Yarn
Classification of Yarn According to Their Use:
Yarns may be divided into two classifications according to their use:
  1. Weaving yarns and 
  2.  Knitting yarns.
Weaving Yarns:
Yarns for woven cloth are prepared for the intended end use. Yarns to be used in the warp, the lengthwise direction of a cloth, are generally stronger, have a tighter twist, and are smoother and more even than are yarns used for filling, the cross wise direction of a cloth. Novelty yarns may be used in the warp, but they are generally found in the filling. Highly twisted crepe yarns are usually found used as filling yarns.

Knitting Yarns:
These may be divided into yarns for hand knitting and yarns for machine knitting. Knitting yarns are more slackly twisted than yarns for weaving. Hand knitting yarns are generally ply, where as those for machine knitting can be either single or ply. The following are some of the yarn used for hand knitting.

Knitted worsted: The four-ply all-around yarn used for accessories, for the house, and for apparel. This is the most common weight of hand-knitting yarn, comprising 90percent of the hand made yarn business.

Fingering (baby or sock) yarn: The fine yarn that was originally wool, but is found Most commonly in acrylic for comfort and ease of care.

Sport yarn: The three-ply yarn used for socks, sweaters, and hats.

Shetland yarn: The two-ply yarn used for sweaters.

Fashion or novelty yarn: Any novelty structure.

All the yarns listed may be found in any fiber. Of the major fibers, rayon is the least likely to be Used in the hand made yarn business. 

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Mazharul Islam Kiron is a textile consultant, entrepreneur, blogger and researcher on online business promotion. He is working as a consultant in several local and international companies. He is also a contributor of Wikipedia.

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