Composite long-fiber non-woven fabric using eccentric sheath/core composite fibers at one or both surfaces

Abstract

Provided is a long-fiber non-woven fabric that: is suitable for a top-sheet or back-sheet part of an absorbent article that is to be used in a sanitary material; achieves both high strength and a bulkiness that provides a cushioning softness; has surface characteristics that can be suitably utilized in sanitary materials; and has excellent processability. The present invention relates to a composite long-fiber non-woven fabric that uses, at one or both surfaces, an eccentric sheath / core long-fiber non-woven fabric that comprises eccentric sheath / core composite fibers that include at least twotypes of thermoplastic resin, the composite long-fiber non-woven fabric being characterized in that the eccentric sheath / core composite fibers have perfectly circular cross-sections and are configuredfrom an elliptical high-melting-point component core part and a low-melting-point component sheath part, in that 100% of the surface of the fibers is covered by the low-melting-point component sheathparts, in that the sheath parts that cover the core parts are 100-500 nm thick at 30%-60% of the surface of the fibers, and in that the thickest portion of the sheath parts is at least 25% of the radius of the fibers. The present invention also relates to a sanitary material that uses the composite long-fiber non-woven fabric.

Description

technical field [0001] The present invention relates to a composite long-fiber nonwoven fabric using eccentric sheath-core composite fibers containing two or more thermoplastic resins on at least one side, and relates to bulkiness and high strength having softness suitable for cushioning properties of hygienic materials, Furthermore, it is a composite long-fiber nonwoven fabric excellent in surface properties required for hygienic materials such as surface smoothness and fuzz resistance. Background technique [0002] In recent years, the popularity of disposable diapers has been astonishing, and the required quality and performance are gradually improving. In particular, in the construction of diapers, softness is the performance required for the surface layer and the back layer, and especially for adult diapers, high elongation is required because it may be accompanied by care. In the high-quality field of the surface layer and the back layer of diapers in the past, staple...

AI Technical Summary

Problems solved by technology

However, for short fibers, the elongation of the fiber itself is almost non-existent, and the strength and elongation of the nonwoven fabric depend on the strength of the fiber bonding point. Therefore, as a means to improve the strength and elongation, it is necessary to increase the viscosity. temperature, will form a hard feel

In addition, the long fibers obtained by the spunbond method are also used for the surface layer and the bottom layer. However, when the spunbond method is used, a non-woven fabric with high strength and elongation is obtained due to its manufacturing method, but the fibers are arranged in the plane direction and occupy the fibers in the thickness direction. Little, difficult to obtain bulkiness

That is, when using conventional long-fiber nonwoven fabrics, there is a problem that it is very difficult to achieve both bulkiness with cushioning softness and high elongation.

[0003] On the other hand, the following Patent Document 1 discloses a nonwoven fabric formed of eccentric sheath-core fibers, but the sheath cores are all in a perfect circle shape, and there is no detailed design description for the shape of the sheath component, and the number of crimps of the fibers is small. , Poor bulkiness

[0004] In addition, the following Patent Document 2 discloses a fiber spherical body made of eccentric sheath core fiber as a raw material suitable for the core cotton of a cushion or a down jacket, but it is difficult to form a sheet suitable for a top layer and a bottom layer of a hygienic material. Words are inappropriate

[0005] In addition, the following Patent Document 3 discloses a short-fiber nonwoven fabric having bulkiness achieved by exhibiting crimps using eccentric sheath-core composite fibers, but there is no description of a long-fiber nonwoven fabric. High friction, smooth hand-feel compromised by end faces on nonwoven surface

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