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What is "Twist" - Definition & Explanation

A term that applies to the number of turns and the direction that two yarns are turned during the manufacturing process. The yarn twist brings the fibers close together and makes them compact. It helps the fibers adhere to one another, increasing yarn strength. The direction and amount of yarn twist helps determine appearance, performance, durability of both yarns and the subsequent fabric or textile product. Single yarns may be twisted to the right (S twist) or to the left (Z twist). Generally, woolen and worsted yarns are S-twist, while cotton and flax yarns are typically Z-twist. Twist is generally expressed as turns per inch (tpi), turns per meter (tpm), or turns per centimeter (tpc).
The number of turns about its axis per unit of length of a yarn or other textile strand.
The winding of yarn around itself. More twist improves carpet performance, especially in a cut pile carpet.

Some other terms

Some more terms:

A tape sewn along the front edge of a coat from top of the lapel to bottom of the facing. On less expensive coats, this tape starts at the bottom of the lapel (called the breakline). The tape is...
(Sun Protection Factor) SPF measures the effectiveness of sunscreen on the body. the test for SPF is done by using a living organism or body to measure the length of time it takes for the skin to...
Interfacing is a common term for a variety of materials used on the unseen or "wrong" side of fabrics in sewing. Interfacings can be used to stiffen or add body to fabric, such as the interfacing...
A finishing process in which the fibers on the surface of the fabric are mechanically trimmed to create an even nap. Often follows brushing of the fabric. Done on fleeces, moleskins, pile fabrics,...
A Windbreaker or windcheater is a thin outer coat designed to resist wind chill and light rain. It is usually of light construction, characteristically made of some type of glossy synthetic material...

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