Heat-bondable composite fiber, manufacturing method for same, and non-woven fabric using heat-bondable composite fiber
AssigneesES FiberVisions LP, ES FiberVisions Hong Kong Limited, ES FiberVisions ApS
InventorSatoshi YONEDA
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Abstract
Provided is a heat-bondable composite fiber which comprises a first component that contains a polyester-based resin and a second component that contains a polyolefin-based resin having a melting point lower than that of the polyester-based resin by 15° C. or more and which has a concentric sheath-core structure in which, in a cross section of a fiber orthogonal to the lengthwise direction of the fiber, the second component occupies the outer periphery of the fiber, wherein elongation at break is 350% or more, and the ratio of elongation at break to fineness is 80%/dtex or more.
Claims10
A heat-bondable composite fiber, comprising a first component containing a polyester-based resin and a second component containing a polyolefin-based resin having a melting point lower than a melting point of the polyester-based resin by 15° C. or more, the heat-bondable composite fiber having a concentric sheath-core structure in which the second component occupies an outer periphery of a fiber in a cross section of the fiber orthogonal to a lengthwise direction of the fiber, wherein the heat-bondable composite fiber has elongation at break of 350% or more and a ratio of elongation at break to fineness of 80%/dtex or more.
A manufacturing method for a heat-bondable composite fiber, comprising:
- a process of melt spinning a first component containing a polyester-based resin and a second component containing a polyolefin-based resin having a melting point lower than a melting point of the polyester-based resin by 15° C. or more so as to have a concentric sheath-core cross-sectional shape in which the second component occupies an outer periphery of a fiber and obtaining an undrawn fiber;
- a process of drawing the undrawn fiber and obtaining a drawn fiber;
- a crimping process of crimping the drawn fiber;
- and
- a process of heat-treating the crimped drawn fiber, wherein
- drawing efficiency represented by an equation below is 40% to 75%:
- drawing efficiency (%)={fineness (dtex) of undrawn fiber/draw magnification (times)/fineness (dtex) of heat-bondable composite fiber}×100
Dependencies are inferred from the claim text.