Thick and thin polyester multifilament yarn
First Claim
1. A thick and thin polyester multifilament yam comprising a plurality of thick and thin polyester individual filaments the thickness of which periodeally varies along the longitudinal direction thereof, wherein when the thick and thin multifilament yarn is subjected to a yam thickness variation measurement, in the normal mode test method using the Uster evenness tester, the resultant spectrogram of the thick and thin multifilament yam exhibits a first peak (Pmax1) of the coefficient of variation in yam thickness at a thickness variation period of 4 to 10 cm and a second peak (Pmax2) of the coefficient of variation in yam thickness at a thickness variation period of 50 to 150 cm, and the ratio (Pmax1/Pmax2) of the first peak coefficient of variation in the yam thickness (Pmax1) to the second peak coefficient of variation in the yam thickness (Pmax2) is in the range of from 1.0 to 4.0.
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Accused Products
Abstract
A thick and thin polyester multifilament yarn having an excellent natural fiber yarn-like hand, a dry touch and spun yarn-like appearance includes a plurality of individual thick and thin polyester multifilaments varying in thickness along the longitudinal direction thereof and exhibits a spectrum having a first peak (Pmax1) of a coefficient of variation in yarn thickness of 4 to 10 cm, a second peak (Pmax2) of the yarn thickness variation coefficient of 50 to 150 cm and a ratio (Pmax1/Pmax2) of 1.5 to 4.0, measured by the normal mode test method using the Uster evenness tester.
9 Citations
7 Claims
- 1. A thick and thin polyester multifilament yam comprising a plurality of thick and thin polyester individual filaments the thickness of which periodeally varies along the longitudinal direction thereof, wherein when the thick and thin multifilament yarn is subjected to a yam thickness variation measurement, in the normal mode test method using the Uster evenness tester, the resultant spectrogram of the thick and thin multifilament yam exhibits a first peak (Pmax1) of the coefficient of variation in yam thickness at a thickness variation period of 4 to 10 cm and a second peak (Pmax2) of the coefficient of variation in yam thickness at a thickness variation period of 50 to 150 cm, and the ratio (Pmax1/Pmax2) of the first peak coefficient of variation in the yam thickness (Pmax1) to the second peak coefficient of variation in the yam thickness (Pmax2) is in the range of from 1.0 to 4.0.
Specification