Yarn Twist
Definition
The number of turns per unit length and the direction of twist in a yarn. S-twist and Z-twist are the two standard notations, and the twist direction can survive transfer.
Related terms
- Birefringence
- The difference between the highest and lowest refractive indices of an anisotropic mineral, seen as a characteristic interference colour between crossed polars....
- Cross-Section Shape
- The geometry of a fibre when sliced perpendicular to its length. Round (nylon), trilobal (some carpet polyesters), dogbone (acrylic), kidney-bean (cotton lumen),...
- Microspectrophotometry (MSP)
- Visible-range spectrophotometry conducted through a microscope, generating an absorbance curve that fingerprints the dye on a single fibre without destroying it.
- Pyrolysis GC-MS
- Heating a tiny polymer sample (about 1 microgram) to roughly 600 to 800 degrees Celsius in an inert atmosphere, separating the volatile...
- Tape Lift
- Adhesive tape pressed onto a substrate to recover fibres, hairs and other particulates. The standard collection method for fibres on clothing, upholstery...
Explained in
- Fiber and Textile Evidence: Yarns, Weaves and Microscopic ExaminationThe number of turns per unit length and the direction of twist in a yarn. S-twist and Z-twist are the two standard notations, and the twist direction can survi...