JPWO2021263086A5 - - Google Patents

Claims (19)

a core; and a braided sheath of strands surrounding the core, the braided sheath including strands having a braid angle of 5° or greater in a relaxed state.
A cord having a core-sheath structure comprising:
here,
The strands having a braid angle of 5° or greater in a relaxed state include at least one shaped filament strand;
The filament shaped strand is a no twist strand having a twist level of less than 1 turn per meter;
the cross-sectional aspect ratio of said filament shaped strands, measured at said braided sheath, is at least 3:1;
a thickness of at least a portion of the braided sheath is in the range of about 20 to about 200 μm; and the braided sheath comprises synthetic fibers having a tensile strength greater than 12 cN/dtex. The filament shaped strand has a cross-section that includes a curved surface;
The cord of claim 1 , wherein the filament shaped strand has a cross-section that includes a plane; or a combination thereof. The filament shaped strand has an elliptical cross section;
The cord according to claim 1 or 2 , wherein the filament shaped strand has a curved cross section including protrusions and recesses; or the filament shaped strand is a flat fiber band having a cross section including a plane. The cord according to claim 1 , wherein the filament shaped strand comprises at least one filament having a non-circular cross section. The cord according to any one of claims 1 to 4 , wherein the maximum diameter of the cord ranges from about 40 μm to less than about 5 mm. The cord according to any one of claims 1 to 5 , wherein the maximum diameter of the core is in the range of about 20 µm to about 5 mm. The cord according to any one of claims 1 to 6 , wherein the ratio of the maximum diameter of the braided sheath to the minimum diameter of the braided sheath is in the range of 1.05:1.0 to 2.5:1.0. The cord according to any one of claims 1 to 7 , wherein the strand having a braid angle of 5° or more is made of at least one filament shaped strand. The filament shaped strand has a flatness factor (F) in the range of 0.05 to 0.45, where F is the flatness factor:

[Wherein,
D _max is the maximum diameter of the braided sheath, in micrometers (μm), measured in a cross-sectional plane of the cord that is perpendicular to the longitudinal axis of the cord;
_Dmin is the minimum diameter of the braided sheath, in micrometers (μm), measured in a cross-sectional plane of the cord perpendicular to the longitudinal axis of the cord; and _Ds is the minimum diameter of the filament bundle before shaping, in micrometers (μm), measured in a cross-sectional plane of the filament bundle perpendicular to the longitudinal axis of the filament bundle.
The code according to any one of claims 1 to 8 , wherein The cord of claim 1 , wherein the braided sheath includes at least one unshaped strand having a cross-sectional aspect ratio of less than 2: 1 . The cord according to any one of claims 1 to 10 , wherein the braided sheath comprises at least one twisted strand having a twist level of from greater than 0 to 1600 turns per meter. The cord according to any one of claims 1 to 11 , wherein the core comprises at least two core strands twisted together at a twist level of from greater than 0 to 1600 turns per meter. The cord according to any one of claims 1 to 12 , wherein the core is a braided core. The cord according to any one of claims 1 to 13 , wherein the tensile strength of the filament shaped strand is at least about 12 cN/dtex. The cord according to any one of claims 1 to 14 , wherein the mass ratio of the braided sheath to the core per unit length of the cord is from about 5/95 to about 45/55. The cord according to any one of claims 1 to 15, wherein the filament shaped strand comprises at least one selected from the group consisting of liquid crystal polyester filaments, aramid filaments, copolymer aramid filaments, polyether ether ketone filaments, poly(p-phenylene benzobisoxazole) filaments, ultra-high molecular weight polyethylene filaments, high modulus polyethylene filaments, polypropylene filaments, polyethylene terephthalate filaments, polyamide filaments , polyhydroquinone diimidazopyridine filaments, and high strength polyvinyl alcohol filaments. 17. The cord according to claim 1, wherein the core comprises at least one selected from the group consisting of liquid crystal polyester filaments, aramid filaments, copolymer aramid filaments, polyether ether ketone filaments, poly(phenylene benzobisoxazole) filaments, ultra-high molecular weight polyethylene filaments, polypropylene filaments, high modulus polyethylene filaments, polyethylene terephthalate filaments, polyamide filaments, and high strength polyvinyl alcohol filaments. A tensile member comprising the cord of any one of claims 1 to 17 , wherein the cord has a linear mass density of from about 30 to about 10,000 denier. The tension member of claim 18 , wherein the tension member is a medical cord.