# US 12,215,443 B2 · Yarn comprising a core and a sheath of fibers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,443 B2 - Document ID: US12215443B2 - Status: Granted - Kind: B2 - Application number: 16/524,635 - Filed: 2019-07-29 - Published: 2020-02-20 - Granted: 2025-02-04 - Earliest claimed: 2018-07-27 - Assignees: Sanko Tekstil Isletmeleri San. Ve Tic. A.S. - Applicants: Sanko Tekstil Isletmeleri San. Ve Tic. A.S. - Inventors: Fatih Konukoǧlu; Erdogan Baris Özden; Şeref Aǧzikara; Ertuǧ Erkuş; Mustafa Zeyrek; Eşref Tuncer; Sedat Demirbüken; Erkan Evran - Web page: https://patentgrep.com/patent/US12215443B2 ## CPC - D02G 3/32: Elastic yarns or threads {; Production of plied or cored yarns, one of which is elastic} - D02G 3/36: Cored or coated yarns or threads ({D02G3/34, D02G3/40 take precedence}; elastic yarns or threads D02G3/32) - D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS ## Abstract A yarn (1) having a core (2) and a sheath (3), preferably comprising staple fibers, said core comprising at least one polymeric core fiber (21), preferably a plurality of polymeric core fibers (21), wherein the amount of the core fibers (21) is at least 35% by weight of the total weight of the yarn (1) and said core (2) and said sheath (3) are spun together. ## Claims ### Claim 1 A composite yarn (1) having a core (2) and a sheath (3) comprising staple fibers, said core comprising at least one polymeric core fiber (21), wherein the amount of the polymeric core fibers (21) is at least 35% by weight of the total weight of the composite yarn (1) and said core (2) and said sheath (3) are spun together, wherein the polymeric core fibers (21) are non-elastomeric and non-texturized fibers having a linear density of 14 denier or less, wherein the core fibers comprise at least 12 filaments said core further comprising at least one elastomeric filament, the non-elastomeric core fibers and the at least one elastomeric filament being connected together via a co-extrusion step in which they are forced through a restriction, where the non-elastomeric core fibers and the at least one elastomeric filament are pressed together and attach to each other to such a degree that they remain attached together also after exiting the restriction, wherein at least part of the core fibers comprise a bundle of filaments comprising fully drawn yarns (FDY). ### Claim 2 (depends on 1) The composite yarn (1) according to claim 1, wherein the amount of core fibers (21) is in the range of 35% to 90% by weight of the yarn (1). ### Claim 3 (depends on 1) The composite yarn (1) according to claim 1, having tenacity comprised between 5 and 160 cN/tex. ### Claim 4 (depends on 1) The composite yarn (1) according to claim 1, wherein said core fibers (21) comprise core fibers (21) that are selected from polyester polymers and copolymers, polyamide polymers and copolymers, polyacrylic polymers, and mixtures thereof. ### Claim 5 (depends on 1) The composite yarn (1) according to claim 1, wherein the twist multiple of the yarn (1) is in the range of 1.2 to 5.5. ### Claim 6 (depends on 1) The composite yarn (1) according to claim 1, wherein the amount of fibers having elastic properties is in the range of 1% to 60% of the total weight of the yarn. ### Claim 7 (depends on 1) The fabric (100) or an article (101) including a composite yarn (1) according to claim 1. ### Claim 8 (depends on 1) A method of preparing a composite yarn (1) according to claim 1, comprising the steps of providing a core (2) of filaments (21), made of polymeric material, providing a plurality of staple fibers (3a), spinning together said core fibers (21) and said staple fibers (3a) to cover said core (2) with a sheath (3) of fibers, wherein the amount of said core fibers (21) is at least 35% by weight of the total weight of the yarn (1), wherein the core fibers (21) are non-elastomeric and non-texturized fibers having a linear density of 14 denier or less, wherein the core fibers comprise at least 12 filaments, said core further comprising at least one elastomeric filament, wherein at least part of the polymeric non-elastomeric core fibers is provided as fully drawn yarns (FDY), the non-elastomeric core fibers and the at least one elastomeric filament being connected together via a co-extrusion step in which they are forced through a restriction, where they are pressed together and attach to each other to such a degree that they remain attached together also after exiting the restriction, said FDY comprising a flat, non-textured yarn. ### Claim 9 (depends on 8) The method according to claim 8, wherein in said spinning step the yarn is provided with a Twist Multiple in the range of 1.2-5.5. ### Claim 10 (depends on 8) The method according to preceding claim 8, wherein the core (2) and the sheath (3), are combined by ring spinning. ### Claim 11 (depends on 10) The method according to claim 10, comprising one or two, or more roving sources for the sheath (3). ### Claim 12 (depends on 4) The composite yarn according to claim 4, wherein the core fibers (21) comprise one or more of: PET (polyethylene terephthalate) filaments; PBT (polybutylene terephthalate) filaments; PTT (Poly tri-methylene terephthalate) filaments; PTMT (poly tetra-methylene terephthalate) filaments; filaments made of copolymer of one or more of PET, PBT, PTT, PTMT; PTT/PET bicomponent filaments, PTT/PBT bicomponent filaments; PTMT/PET bicomponent filaments. ### Claim 13 A composite yarn (1) having a core (2) and a sheath (3) comprising staple fibers, said core comprising a plurality of polymeric core fibers (21), wherein the amount of the polymeric core fibers (21) is at least 35% by weight of the total weight of the yarn (1) and said core (2) and said sheath (3) are spun together, wherein the polymeric core fibers (21) are non-elastomeric and non-texturized fibers, wherein the twist multiple of the yarn is in the range 1.2 to 5.5 and wherein at least part of the core fibers comprise a bundle of filaments comprising fully drawn yarns (FDY) and wherein the polymeric core fibers (21) are non-elastomeric and non-texturized fibers having a linear density of 14 denier or less. ### Claim 14 A method of preparing a composite yarn, said method comprising: providing a core comprising core fibers made of polymeric material, the core fibers comprising non-elastomeric and non-texturized fibers having a linear density of 14 denier or less and comprising at least 12 filaments, said core further comprising at least one elastomeric filament; providing a plurality of staple fibers, drawing the core fibers from a spinneret to produce a bundle of fully drawn yarns (FDY); connecting together the FDY bundle of core fibers and the at least one elastomeric filament via co-extrusion comprising forcing the core fibers and the at least one elastomeric filament through a restriction, where the core fibers and the at least one elastomeric filament are pressed together and attach to each other to such a degree that they remain attached together after exiting the restriction; and spinning together said core and said staple fibers to cover said core with a sheath of fibers, wherein the amount of said core fibers is at least 35% by weight of the total weight of the yarn. ### Claim 15 (depends on 14) The method according to claim 14, wherein said forcing comprises forcing the non-elastomeric core fibers and the at least one elastomeric filament through the restriction in a tensioned state. ### Claim 16 (depends on 14) The method according to claim 14, further comprising elongating said at least one elastomeric filament before said forcing. ### Claim 17 A method of preparing a composite yarn, said method comprising: providing a core comprising core fibers made of polymeric material, the core fibers comprising non-elastomeric and non-texturized fibers having a linear density of 14 denier or less and comprising at least 12 filaments, said core further comprising at least one elastomeric filament; providing a plurality of staple fibers, drawing the core fibers from a spinneret to produce a bundle of fully drawn yarns (FDY); connecting together the FDY bundle of core fibers and the at least one elastomeric filament via co-extrusion comprising forcing the core fibers and the at least one elastomeric filament through a restriction, where the core fibers and the at least one elastomeric filament are pressed together and attach to each other to such a degree that they remain attached together after exiting the restriction; and spinning together said core and said staple fibers to cover said core with a sheath of fibers, wherein the amount of said core fibers is at least 35% by weight of the total weight of the yarn and further comprising elongating said at least one elastomeric filament before said forcing and wherein a draft ratio of said elongating comprises a range of 4.5 to 5.5. ### Claim 18 (depends on 14) The method according to claim 14, further comprising: drying, melting and filtering a plurality of PET (polyethylene terephthalate) chips; distributing the PET chips to spinning manifolds; melting the PET chips; filtering the melted PET chips through a polymer filter; and delivering the melted PET chips to said spinneret. ### Claim 19 (depends on 18) The method according to claim 18, wherein said drawing the core fibers from a spinneret comprises extruding through the spinneret. ### Claim 20 (depends on 18) The method according to claim 18, wherein drawing the core fibers from a spinneret comprises passing the fibers through the spinneret. ### Claim 21 (depends on 1) The composite yarn according to claim 1, wherein said FDY comprises a flat, non-textured yarn. ### Claim 22 (depends on 1) The composite yarn according to claim 1, wherein the at least one elastomeric filament is in a stretched state when pressed together and attached to the non-elastomeric core fibers. ### Claim 23 (depends on 13) The composite yarn according to claim 13, wherein said FDY comprises a flat, non-textured yarn. ### Claim 24 (depends on 8) The method according to claim 8, further comprising elongating said at least one elastomeric filament prior to said forcing through a restriction such that the at least one elastomeric filament is in a tensioned state prior to said forcing. ### Claim 25 (depends on 1) A method of preparing a composite yarn (1) according to claim 1, comprising the steps of providing a core (2) of filaments (21), made of polymeric material, providing a plurality of staple fibers (3a), spinning together said core fibers (21) and said staple fibers (3a) to cover said core (2) with a sheath (3) of fibers, wherein the amount of said core fibers (21) is at least 35% by weight of the total weight of the yarn (1), wherein the core fibers (21) are non-elastomeric and non-texturized fibers having a linear density of 14 denier or less, wherein the core fibers comprise at least 12 filaments, said core further comprising at least one elastomeric filament, wherein at least part of the polymeric non-elastomeric core fibers is provided as fully drawn yarns (FDY), the non-elastomeric core fibers and the at least one elastomeric filament being connected together via a co-extrusion step in which they are forced through a restriction, where they are pressed together and attach to each other to such a degree that they remain attached together also after exiting the restriction, said FDY comprising a flat, non-textured yarn, said method further comprising elongating said at least one elastomeric filament prior to said forcing through a restriction such that the at least one elastomeric filament is in a tensioned state prior to said forcing wherein a draft ratio of said elongating lies within a range of 4.5 to 5.5.