Fibrous sheet
AssigneeKuraray Co., Ltd.
InventorSatoshi Koizumi
Life of this patent
Estimating the term…
Abstract
Provided are a fibrous sheet having a stress relaxation rate defined by the following formula of less than or equal to 85%: stress relaxation rate [%]=(stress S5 at extension after five minutes/stress S0 at initial extension)×100 when a stress at extension immediately after extension in an in-plane first direction at 50% elongation is defined as a stress S0 (N/50 mm) at initial extension, and a stress at extension at a time of extending in the first direction at 50% elongation for five minutes is defined as a stress S5 (N/50 mm) at extension after five minutes, and a bandage including the fibrous sheet.
Claims9
A fibrous sheet that satisfies a formula below:
- 80[%]≤{T3/(3×T1)}×100≤85[%];
- when a thickness of the fibrous sheet measured in accordance with A method specified in JIS L 1913 is defined as T1 [mm], and a thickness of three superimposed fibrous sheets measured under the same conditions is defined as T3 [mm],
- wherein the fibrous sheet contains only a nonelastomer material,
- the fibrous sheet is a nonwoven fabric,
- the nonwoven fabric contains crimped fibers crimped into a coil shape,
- the crimped fiber is constituted of a conjugated fiber in which a plurality of resins having different thermal shrinkage factors form a phase structure, and is oriented substantially parallel with the plane direction of the fibrous sheet,
- the average curvature radius of circles formed by coils of the crimped fibers is 20 to 200 μm, and
- wherein upon forming the fibrous sheet, the fibrous sheet is dried at a temperature in a range from 120° C. to less than 160° C., sufficient to satisfy the formula above.
Dependencies are inferred from the claim text.