Chenille is a type of yarn that is included in the fantasy yarn group and has a special importance. The literal meaning of the word chenille is caterpillar or hairy caterpillar. Chenille yarn has a soft, hairy and unusual surface. Chenille yarns have a cut pile structure in which the fibers are arranged helically around two axial yarns. Due to this helical structure, a very pleasant wavy appearance on the yarn surface and a shine on the fabric surface are formed. To prevent the pile yarn from separating from the ground yarn, mechanical friction forces occur between the lock and the pile yarns. 
Two types of yarn are used in the production of chenille yarn: pile (effect) yarn and lock (basic, core, core) yarn. 
The effect that provides the formation of this yarn is based on the principle of fixing (compressing) the piles formed by folding together 2 high twisted, thin and durable yarns, called lock yarn, and cutting a spun or soft filament yarn from staple fibers with a given twist along the length of the basic yarn. is based on. 
Pile yarn; It is the yarn that adds aesthetic value to the chenille yarn and determines the surface appearance. While providing volume to the yarn, it constitutes 70-75% of the structure in terms of mass. Low twist yarns are used as pile yarn. Therefore, they do not have a solid structure. When fabric is produced from chenille yarns, the pile yarns stay on the fabric surface and give the fabric a different appearance. 
Lock thread; pile is the yarn that holds the pile cut from the yarns thanks to the twist on it. Chenille gives strength to the yarn and constitutes 25-30% of the yarn mass. In the production of chenille yarn, lock yarns from all kinds of natural or artificial raw materials such as wool, cotton, viscose, acrylic, polyester, polyamide can be used. Threads with slippery surfaces such as floss threads are used in the production of chenille threads, and they are mixed with some synthetic threads. By creating a mixture, production difficulties that may occur due to the slippery fiber are tried to be eliminated. For high quality chenille yarn, the lock and pile components must be selected correctly.