Composite long-fiber nonwoven fabric using eccentric sheath-core composite fibers on at least one side

Abstract

Provides a surface layer and a back layer of an absorbent article suitable for use in a sanitary material, has both bulkiness and high strength with cushioning softness, and has surface properties suitable for use as a sanitary material, and processing suitability Excellent long fiber nonwoven. The present invention relates to a composite long-fiber nonwoven fabric and a hygienic material using the composite long-fiber nonwoven fabric, wherein the composite long-fiber nonwoven fabric is characterized in that an eccentric sheath including an eccentric sheath core type composite fiber is used on at least one side. A core type long-fiber nonwoven fabric, the eccentric sheath core type composite fiber contains two or more thermoplastic resins, the eccentric sheath core type composite fiber has a perfect circular cross section, and an elliptical core part of a high melting point component and a low temperature The sheath part of the melting point component has a structure in which 100% of the surface of the fiber is covered by the sheath part as the low melting point component, and the thickness of the sheath part covering the core part of 100 to 500 nm occupies 30% of the entire surface of the fiber ~60%, and the thickness of the thickest part of the sheath is 25% or more of the fiber radius.

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 has bulkiness, high strength, high strength, and softness suitable for cushioning properties of sanitary materials. Furthermore, the composite long-fiber nonwoven fabric is excellent in surface properties required for sanitary materials, such as surface smoothness and fluff resistance. Background technique [0002] In recent years, the popularity of disposable diapers has been amazing, and the required quality and performance are gradually improving. In particular, in the structure of a diaper, the performance required for the surface layer and the back layer is softness, and especially for an adult diaper, a high tensile elongation is required because nursing is sometimes accompanied. In the high-quality fields of the surface and back layers of conventional diapers, ...

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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