US 12,281,413 B2
Wound yarn package and manufacturing method thereof
Seiji Tanaka, Tokyo (JP)
Assigned to UBE EXYSMO CO., LTD., Tokyo (JP)
Appl. No. 17/767,922
Filed by UBE EXSYMO CO., LTD., Tokyo (JP)
PCT Filed Oct. 16, 2020, PCT No. PCT/JP2020/039089
§ 371(c)(1), (2) Date Apr. 11, 2022,
PCT Pub. No. WO2021/085183, PCT Pub. Date May 6, 2021.
Claims priority of application No. 2019-195835 (JP), filed on Oct. 29, 2019.
Prior Publication US 2024/0092608 A1, Mar. 21, 2024
Int. Cl. B65H 55/04 (2006.01); D01D 10/04 (2006.01)
CPC D01D 10/0409 (2013.01) [B65H 55/04 (2013.01); B65H 2701/37 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A wound yarn package comprising
a bobbin, and
yarn layers comprising layers of a single yarn wound around the bobbin in a traverse mode,
wherein each yarn constituting the n-th yarn turn, where n is an integer of 2 or more, is wound at a position 0 to 0.5 x mm away from each yarn constituting the (n−1)-th yarn turn, with the yarn width of the single yarn being taken as x mm,
wherein the single yarn is a sea-island type fiber having a tape-shape or an elliptical cross-section, formed by integrating dozens to hundreds of melt-spun single fibers having at least two different melting points by fusion or heat welding into the single yarn including a sea component and an island component,
wherein the sea-island type fiber has a heat shrinkage rate of 2% or less at a temperature lower by 20° C. than the melting point of the sea component, and has a fineness ranging from 100 to 6400 dtex.