JP2013122104A5

JP2013122104A5 -

Info

Publication number: JP2013122104A5
Application number: JP2012233482A
Authority: JP
Filing date: 2012-10-23
Publication date: 2015-12-03
Anticipated expiration: 2032-10-23

Claims

It consists of a first resin component and a second resin component having a melting point or softening point lower than the melting point of the first resin component, and the second resin component exists at least part of the fiber surface continuously in the length direction. And a heat-extensible fiber whose length is increased by heating,
The change rate ({(B−A) / A} × 100) of the thermal elongation rate B at the melting point of the second resin component + 10 ° C. with respect to the thermal elongation rate A at the melting point−6 ° C. of the second resin component is 130. der least% is,
The first resin component is made of polylactic acid, the second resin component is made of polyolefin,
The weight ratio of the first resin component and a second resin component, the first resin component: second resin component 20:80 der from to 80:20 Ru heat extensible fiber.

The heat-extensible fiber according to claim 1, wherein the heat-extension rate A is 3.5% or less.

The heat-extensible fiber according to claim 1 or 2, wherein the polylactic acid has a melt index of 2 g / 10 min to 50 g / 10 min.

The heat-extensible fiber according to any one of claims 1 to 3, wherein an orientation index of the first resin component made of polylactic acid is 3% or more and 50% or less.

The heat-extensible fiber according to any one of claims 1 to 4, wherein the polyolefin is made of polyethylene.

The heat-extensible fiber according to any one of claims 1 to 5 is used as a raw material, and has a plurality of convex portions and concave portions on one surface side, and the other surface side is flatter than one surface side. It is a non-woven fabric that contains the heat-extensible fiber in a thermally stretched state on the convex part,
Present at a position corresponding to the convex portion on the surface on the other surface side, existing at a position corresponding to the convex portion on the surface on the one surface side, and the thermal elongation rate C of the thermally extensible fiber in a thermally stretched state, A nonwoven fabric in which the ratio (C / D) to the thermal elongation rate D of the thermally stretchable fiber in a thermally stretched state is 3 or more at the melting point + 20 ° C. of the second resin component constituting the thermally stretchable fiber.

A non-woven fabric using the heat-extensible fiber according to any one of claims 1 to 5 as a raw material,
The non-woven fabric has a plurality of convex portions and concave portions on one surface side, and also has a plurality of convex portions and concave portions on the other surface side, the convex portions and concave portions on one surface side, and the other surface The convex portion and concave portion on the side are located at the same position in the plan view of the nonwoven fabric,
The convex part contains a heat-extensible fiber in a heat-extended state,
Present at a position corresponding to the convex portion on the surface on the other surface side, existing at a position corresponding to the convex portion on the surface on the one surface side, and the thermal elongation rate E of the heat-extensible fiber in a thermally stretched state, The ratio (E / F) with the thermal elongation rate F of the thermally stretchable fiber in the thermally stretched state is 0.1 or more and less than 3 at the melting point + 20 ° C. of the second resin component constituting the thermally stretchable fiber,
In a convex part, the thickness of the convex part in the other surface side on the basis of the center position of the thickness direction of a nonwoven fabric occupies 20% or more and 40% or less of the thickness of the whole convex part.

The spinning temperature of the first component is set in the range of the melting point of the first component plus 20 ° C. to 180 ° C., and the spinning temperature of the second resin component is set in the range of the melting point of the second component plus 20 ° C. to 180 ° C. ,
Performing melt spinning at a spinning speed of 50 m / min to 1500 m / min,
Stretching is performed, crimping is performed,
Then, relaxation treatment by heat drying is performed at 100 ° C. or more and 125 ° C. or less,
The change rate ({(B−A) / A} × 100) of the thermal elongation rate B at the melting point of the second resin component + 10 ° C. with respect to the thermal elongation rate A at the melting point−6 ° C. of the second resin component is 130. % Or more,
A method for producing a heat-extensible fiber, wherein the first resin component is made of polylactic acid and the second resin component is made of polyolefin.