JP6310294B2 - Top sheet for absorbent articles - Google Patents

Description

  The present invention relates to a surface sheet of an absorbent article.

  2. Description of the Related Art Conventionally, as surface sheets for absorbent articles such as sanitary napkins and disposable diapers, there are known ones in which unevenness is formed by embossing a surface that comes into contact with a wearer's skin. According to the uneven surface sheet, it is possible to reduce the contact area with the wearer's skin due to the presence of the unevenness, and it can be expected to reduce stickiness and stuffiness.

  The present applicant has previously proposed a surface sheet of an absorbent article in which a plurality of uniform-height solid dome structure convex portions surrounded by four embossed portions are formed (see Patent Document 1). In addition, the present applicant has previously proposed a surface sheet of an absorbent article having a plurality of large convex portions of a three-dimensional dome structure and a plurality of small convex portions of a three-dimensional dome structure (see Patent Document 2). ).

JP 2009-512 A JP 2011-15707 A

  However, the surface sheet described in Patent Document 1 has a uniform height of the convex portion of the three-dimensional dome structure, and there is room for improvement in terms of reducing the contact area with the wearer's skin.

  On the other hand, according to the surface sheet described in Patent Document 2, the contact area with the skin of the wearer is reduced by the large and small convex portions of the two-dimensional solid dome structure. Can be reduced. However, in the surface sheet described in Patent Document 2, large convex portions of a region having a large area among polygonal regions surrounded by embossing are continuously arranged in a certain direction, and in a direction orthogonal to the certain direction. In some cases, the small convex portions of the adjacent areas having a small area are easily crushed, and the contact area cannot be reduced as designed. If it becomes like this, a bodily fluid will spread | diffuse easily in this orthogonal direction, and it will cause a liquid leak, or the height between two low convex parts nearest to the said fixed direction will become high, and a passage of air or steam However, there is room for improvement in the suppression of stuffiness.

  Therefore, this invention is providing the surface sheet for absorbent articles which improved further the prior art mentioned above.

  The present invention is a surface sheet for an absorbent article having a heat-shrinkable fiber layer containing heat-shrinkable heat-shrinkable fibers and having a plurality of embossed portions, and is surrounded by a plurality of the embossed portions. There are a plurality of rectangular regions, the embossed portion forms the top of the large polygonal region, and the area smaller than the large polygonal region surrounded by the embossed portions forming the tops of the plurality of large polygonal regions is small. There are a plurality of polygonal regions, and the embossed portion also forms the top of the small polygonal region, a high convex portion is formed in each of the large polygonal regions, and in each of the small polygonal regions, the A low convex portion having a height lower than that of the high convex portion is formed, and a plurality of the large polygon regions are arranged adjacent to each other along the first direction; Small polygonal regions are arranged adjacent to each other along the first direction Constructed and small polygonal region row, is to provide a topsheet for an absorbent article which are arranged alternately in a second direction perpendicular to the first direction.

  ADVANTAGE OF THE INVENTION According to this invention, while maintaining a soft texture, while further reducing a contact area with a wearer's skin, a sticky feeling and stuffiness can further be reduced.

FIG. 1: is the top view which looked at the sanitary napkin which is an absorbent article using the surface sheet of this invention from the surface sheet side. 2 is a cross-sectional view taken along line II-II shown in FIG. FIG. 3 is a perspective view showing a top sheet for absorbent articles according to the first embodiment of the present invention. FIG. 4 is a plan view showing the shape and arrangement pattern of embossed portions in the topsheet shown in FIG. FIG. 5 is an enlarged plan view showing the shape and arrangement pattern of the embossed portion in the high convex portion shown in FIG. FIG. 6 is an enlarged plan view showing the shape and arrangement pattern of the embossed portion in the low convex portion shown in FIG. 7 is a cross-sectional view taken along line VII-VII shown in FIG. 8 is a cross-sectional view taken along line VIII-VIII shown in FIG. 9 is a cross-sectional view taken along line IX-IX shown in FIG. FIG. 10: is a top view which shows the shape and arrangement | positioning pattern of an embossing part in the surface sheet for absorbent articles which is 2nd Embodiment of this invention. FIG. 11: is a top view which shows the shape and arrangement | positioning pattern of an embossing part in the surface sheet for absorbent articles which is 3rd Embodiment of this invention. FIG. 12: is a top view which shows the modification of the shape of the embossed part in the surface sheet for absorbent articles which is another embodiment of this invention, and the arrangement pattern of this embossed part. FIG. 13: is a top view which shows the modification of the shape of the embossed part in the surface sheet for absorbent articles which is further another embodiment of this invention, and the arrangement pattern of this embossed part. FIG. 14: is a top view which shows the shape and arrangement | positioning pattern of an embossing part in the surface sheet which is the comparative example 1 of the surface sheet for absorbent articles of this invention. FIG. 15: is a top view which shows the shape and arrangement | positioning pattern of an embossed part in the surface sheet which is the comparative example 2 of the surface sheet for absorbent articles of this invention. FIG. 16: is a top view which shows the shape and arrangement | positioning pattern of an embossing part in the surface sheet which is the reference example 1 of the surface sheet for absorbent articles of this invention.

  Hereinafter, a preferred first embodiment of a top sheet for absorbent articles of the present invention will be described with reference to FIGS. The Y direction in the figure is the second direction and is the same direction as the machine direction (MD direction). Further, the X direction in the figure is a first direction orthogonal to the second direction, and is the same direction as the direction (CD direction) orthogonal to the machine direction (MD direction). The Z direction in the figure is the thickness direction.

  1 and 2 show a sanitary napkin 10 using a top sheet 1A for absorbent articles according to the first embodiment (hereinafter also referred to as top sheet 1A). A sanitary napkin (hereinafter also referred to as a napkin) 10 is disposed between a front sheet 1A disposed on the skin contact surface side, a back sheet 12 disposed on the non-skin contact surface side, and both the sheets 1A and 12. In addition, a long absorber 13 is provided in the Y direction. Further, the napkin 10 is provided with a pair of side sheets 14 and 14 on both side portions 10s and 10s along the Y direction, and a pair of wing portions 15 and 15 extending outward in the X direction. . As shown in FIG. 1, the napkin 10 is formed symmetrically with respect to a center line CL extending in the Y direction. Thus, in the napkin 10, the Y direction is the same as the longitudinal direction of the product corresponding to the wearer's longitudinal direction, and the X direction is also the same as the lateral direction of the product.

  In the present specification, the “skin contact surface” is a surface disposed on the skin side of the wearer when worn, out of the front and back surfaces of each member such as a surface sheet constituting the napkin 10, The “skin contact surface” is a surface of the front and back surfaces of each member such as a surface sheet that is directed to the side opposite to the wearer's skin side when worn.

  The napkin 10 will be described in detail. As shown in FIG. 1, the napkin 10 has an absorbent main body 11 including a top sheet 1 </ b> A, a back sheet 12, and an absorbent body 13 disposed between the sheets 1 </ b> A and 12. ing. As shown in FIG. 1, the absorbent main body 11 includes a central part A, which is an area where the wing parts 15, 15 are located, and a front part disposed on the stomach side of the wearer from the central part A when the sanitary napkin 10 is worn. B and the back part C arranged on the back side of the wearer rather than the central part A when the napkin 10 is worn. When the napkin 10 is worn, the central part A of the absorbent main body 11 is usually disposed opposite to the excretion part (such as the vaginal opening) of the wearer. In other words, the wing part 15 is formed in the excretion facing area (area facing the excretion part of the wearer) of the absorbent main body 11.

  As shown in FIG. 2, each of the top sheet 1 </ b> A and the back sheet 12 forming the absorbent main body 11 covers the entire surface on the skin contact surface side and the entire non-skin contact surface side of the absorber 13, and absorbs it. It has an extending portion that extends from the periphery of the body 13. As shown in FIG. 2, the top sheet 1 </ b> A has a length in the X direction shorter than a length in the X direction of the back sheet 12. As shown in FIGS. 1 and 2, each of the pair of side sheets 14 and 14 is disposed on and fixed to the skin contact surface side of the top sheet 1A over the entire side portion along the Y direction of the top sheet 1A. And has an extending portion that extends outward in the X direction from the side portion of the topsheet 1A. In the napkin 10, as shown in FIGS. 1 and 2, the X-direction outward extension of the back sheet 12 and the X-direction extension of the side sheet 14 are fixed by adhesion, fusion, or the like. The wing portion 15 is formed by extending outward in the X direction at the central portion A more than the front portion B and the rear portion C. Adhesives are respectively applied to the width direction (X direction) center part of the back sheet 12 of the napkin 10 and the non-skin facing surface of the extending part of the back sheet 12 of the wing part 15. A fixing portion 16 for fixing to the underwear is formed. In addition, each side seat | sheet 14 arrange | positions and fixes the elastic member of the expansion | extension state in the Y direction near the edge part of the X direction inner side (centerline CL side), and the shrinkage force of the elastic member at the time of wear Thus, a three-dimensional gather in which a portion having a predetermined width from the end portion is separated from the top sheet 1A may be formed.

  Further, the napkin 10 has a round embossed groove (not shown) formed by integrally compressing the topsheet 1A and the absorber 13 extending in the Y direction from the front part B to the rear part C. It is extended. The embossed groove (not shown) is formed in a single round shape connected to the front part B, the both side parts 10s, 10s and the rear part C of the napkin 10. The embossed groove (not shown) is formed by compressing the topsheet 1A and the absorber 13 from the skin contact surface side with or without heat.

  As shown in FIG. 3, the surface sheet for absorbent articles of the present invention is a sheet having a heat-shrinkable fiber layer 1d containing heat-shrinkable fibers that have been heat-shrinked, and a plurality of embossed portions 2 formed thereon. More specifically, the topsheet 1A of the napkin 10 has a heat-shrinkable fiber layer 1d, and further has a non-heat-shrinkable fiber layer 1u made of non-heat-shrinkable fibers laminated on the heat-shrinkable fiber layer 1d. Further, the top sheet 1A is formed by disposing the non-heat-shrinkable fiber layer 1u on the skin contact surface side and the heat-shrinkable fiber layer 1d on the non-skin contact surface side.

  The heat-shrinkable fiber layer 1d and the non-heat-shrinkable fiber layer 1u of the top sheet 1A are intermittently joined by a plurality of embossed portions 2. Specifically, in the topsheet 1A, the heat-shrinkable fiber layer 1d and the non-heat-shrinkable fiber layer 1u are partially bonded and bonded together by a plurality of regularly arranged embossed portions 2, and the non-skin The heat-shrinkable fibers of the heat-shrinkable fiber layer 1d on the contact surface side are formed by heat-shrinking. As shown in FIG. 3, the top sheet 1 </ b> A has a plurality of concave portions recessed by the embossed portion 2 embossed from the skin contact surface side of the non-heat-shrinkable fiber layer 1 u and a plurality of convex portions on the non-embossed non-embossed portion. Part 3 is formed.

  The surface sheet of the present invention has a plurality of large polygonal regions BT surrounded by a plurality of embossed portions 2, and the embossed portions 2 form the tops of the large polygonal regions BT. Moreover, the surface sheet of the present invention has a plurality of small polygon regions ST smaller in area than the large polygon region BT surrounded by the embossed portions 2 forming the tops of the plurality of large polygon regions BT. It also forms the top of the small polygon region ST. Thus, the surface sheet of the present invention is formed with a polygonal region (large polygonal region BT, small polygonal region ST) surrounded by a plurality of embossed portions 2, and the polygonal region (large polygonal region BT, The inside of the small polygon region ST) is a non-embossed portion. Specifically, as shown in FIGS. 3 and 4, the polygonal region is adjacent to a plurality of large polygonal regions BT having a relatively large area surrounded by these embossed portions 2. And a plurality of small polygonal regions ST having an area smaller than that of the large polygonal region BT surrounded by the embossed portion 2 forming the top of the plurality of large polygonal regions BT. Thus, the large polygon region BT and the small polygon region ST adjacent thereto have the embossed portion 2 as a common top portion. In this specification, “the embossed portion 2 is the top” or “the embossed portion 2 is the apex” does not mean that the embossed portion 2 as a whole is the apex. This includes the case where a part of part 2 is a vertex. In the topsheet 1A of the present embodiment, a part of the embossed part 2 is a vertex of each polygonal area, and the remaining part excluding the vertex of the embossed part 2 is a part of the side that forms the outer shape of each polygonal area. ing. In addition, the expression “surrounded by the embossed part” does not mean an area formed inside the embossed part, but means an area formed including the embossed part.

  Specifically, in the topsheet 1A of the present embodiment, the large polygonal region BT is surrounded by the six embossed portions 2 forming the top as shown in FIG. 4, and the outer shape is a hexagonal shape. Yes. On the other hand, the small polygonal region ST is surrounded by the four embossed portions 2 forming the top, and the outer shape is a square shape. Then, with respect to the first direction (X direction), two adjacent large polygonal regions BT, BT are two embossed portions 2 (2 of the six embossed portions 2 constituting each large polygonal region BT. The two other embossed portions 22, which will be described later, are shared, and are separated from each other by sides connecting the two embossed portions 2, 2 (two other embossed portions 22 described later). As for the second direction (Y direction), two adjacent large polygonal regions BT, BT are one embossed portion 2 (intermediate to be described later) of the six embossed portions 6 constituting each large polygonal region BT. The embossed portion 21) is shared and separated from each other by the one embossed portion 2 (intermediate embossed portion 21 described later). One rectangular small polygon region ST is surrounded by four hexagonal large polygon regions BT. The adjacent small polygon region ST and each large polygon region BT share two embossed portions 2 (the intermediate embossed portion 21 described later and the other embossed portion 22 described later) of the six embossed portions 6, and the 2 Two embossed portions 2 (an intermediate embossed portion 21 described later and another embossed portion 22 described later) are separated from each other. Therefore, in the topsheet 1A, the four embossed portions 2 constituting the small polygon region ST are all shared with the embossed portions 2 constituting the four large polygon regions BT adjacent to the small polygon region ST. ing.

  In the surface sheet of the present invention, as shown in FIGS. 3 and 4, a large polygon region row BTL formed by arranging a plurality of large polygon regions BT adjacent to each other along the first direction (X direction) is provided. Is formed. Moreover, in the surface sheet of the present invention, a small polygon region row STL is formed in which a plurality of small polygon regions ST are arranged adjacent to each other along the first direction (X direction). The large polygon region row BTL and the small polygon region row STL are alternately arranged in a second direction (Y direction) orthogonal to the first direction (X direction). That is, along the second direction (Y direction), the large polygon region row BTL, the small polygon region row STL, the large polygon region row BTL,... Are alternately arranged.

  As shown in FIG. 3, in the surface sheet of the present invention, high convex portions 31 having a relatively high height are formed in each large polygonal region BT. In the topsheet 1A of the present embodiment, a plurality of high convex portions 31 are arranged along the first direction (X direction) to constitute a high convex portion row 31L. On the other hand, in each small polygon area ST, a low convex portion 32 having a height lower than that of the high convex portion 31 is formed. Further, in the topsheet 1A of the present embodiment, a plurality of low convex portions 32 are arranged along the first direction (X direction) to constitute the low convex portion row 32L. And the high convex part row | line 31L and the low convex part row | line | column 32L are alternately arrange | positioned by the 2nd direction (Y direction) orthogonal to a 1st direction (X direction). That is, along the second direction (Y direction), the high convex portion rows 31L, the low convex portion rows 32L, the high convex portion rows 31L,. And the high convex part 31 of the high convex part row | line | column 31L and the low convex part 32 of the low convex part row | line | column 32L are arrange | positioned on the surface sheet 1A in zigzag form. In other words, the high protrusions 31 and the low protrusions 32 are alternately arranged in a diagonal direction with respect to each of the first direction (X direction) and the second direction (Y direction). The high convex portion 31 and the low convex portion 32 will be described in detail later.

  In the topsheet 1A of the present embodiment, as shown in FIGS. 3 and 4, the embossed portion 2 is between the two high convex portions 31 and 31 located closest to each other in the second direction (Y direction). In addition, the intermediate embossed portion 21 is provided between the two low convex portions 32 and 32 located closest to each other in the first direction (X direction). Specifically, with respect to the second direction (Y direction), between the two closest high convex portions 31 and 31 among the high convex portions constituting the closest high convex portion rows 31L and 31L, and Of the two low convex portions 32, 32 closest to each other in the first direction (X direction) constituting the low convex portion row 32L positioned between the high convex portion rows 31L, 31L closest in the second direction (Y direction) There is one intermediate embossed portion 21 between them. In the topsheet 1A, the plurality of embossed portions 2 are formed of two types of embossed portions, the first is the intermediate embossed portion 21, and the second is the remaining other embossed portions 22 excluding the intermediate embossed portion 21. is there. In the present specification, “one embossed portion” means an embossed shape that can be regarded as one in appearance, and even if the embossed portion is composed of a plurality of dots or broken lines, "Embossed part of".

  As shown in FIG. 4, each of the intermediate embossed portions 21 includes four embossed portions 6 that constitute each small polygonal region ST by rectangular small polygonal regions ST and ST adjacent in the first direction (X direction). The hexagonal large polygon regions BT and BT that are shared as one embossed portion 2 and adjacent to each other in the second direction (Y direction) of the six embossed portions 6 constituting each polygonal region BT. It is shared as one embossed part 2. Accordingly, each intermediate embossed portion 21 is disposed at an intermediate position between the two low convex portions 32, 32 that are closest to each other in the first direction (X direction), and the two highest heights that are closest to each other in the second direction (Y direction). It is arranged at an intermediate position between the convex portions 31 and 31.

  As shown in FIGS. 5 and 6, each of the intermediate embossed portions 21 is formed from the center point of the top that forms the apex of the two large polygonal regions BT that are closest to the second direction (Y direction). A bi-directionally extending shape portion 21a extending along the side forming the outer shape of the region BT is provided. As described above, in the topsheet 1A, the large polygonal regions BT and BT adjacent in the second direction (Y direction) share one apex. In the topsheet 1A, the tops of the rectangular small polygonal areas ST are all shared with the tops of the hexagonal large polygonal areas BT adjacent to the small polygonal areas ST. Therefore, the two-direction extending shape portions 21a and 21a adjacent to each other in the second direction (Y direction) are in contact with each other, and the intermediate embossed portion 21 is one hexagonal shape adjacent to the second direction (Y direction) from the apex. Extending along the side forming the outer shape of the large polygonal region BT, and the side forming the outer shape of the other hexagonal large polygonal region BT adjacent in the second direction (Y direction) from the apex It is formed in a four-direction extending shape extending along, that is, in an X shape. The X-shaped intermediate embossed portion 21 has a shape in which four projecting portions 21e extend from the apex in plan view. The four projecting portions 21e have the same length, and the X-shaped intermediate embossed portion 21 has a line parallel to a first direction (X direction) passing through the center point and a second direction passing through the center point. The shape is axisymmetric with respect to each line parallel to the (Y direction).

  In the X-shaped intermediate embossed portion 21, the crossing angle θ1 (see FIG. 5) between the protruding portions 21e in the second direction (Y direction) reduces the contact area with the skin in the top sheet 1A and provides a good touch. From the viewpoint of maintaining and improving the visual impression, it is preferably 50 ° or more, particularly preferably 70 ° or more, and preferably 170 ° or less, particularly preferably 130 ° or less, more specifically 50 ° or more. It is preferably 170 ° or less, and more preferably 70 ° or more and 130 ° or less. In the topsheet 1A, the intersection angle θ1 is 90 °.

  As shown in FIG. 4, each other embossed portion 22 has a center of the top of the small polygon region ST sharing one top and the two large polygon regions BT and BT adjacent in the first direction (X direction). A part of the outer shape of the rectangular small polygonal region ST is formed from the apex as a point, and extends along a side forming a part of the outer shape of one hexagonal large polygonal region BT; and A part of the outer shape of the rectangular small polygonal region ST is formed from the vertex that is the center point of the top part, and extends along a side that forms a part of the outer shape of the other hexagonal large polygonal region BT. And extending in three directions extending along a side forming a part of the outer shape of one hexagonal large polygonal region BT and forming a part of the outer shape of the other hexagonal large polygonal region BT. It is formed into a shape, that is, a Y shape. The other embossed portion 22 in the Y shape has a shape in which three projecting portions 22e extend from the vertex that is the center point of the top portion in plan view. Each of the three protrusions 22e has the same length, and the other embossed portion 22 of the Y shape has a line-symmetric shape with respect to a line parallel to the second direction (Y direction) passing through the center point. It has become.

  In the other embossed portion 22 in the Y shape, the crossing angle θ2 (see FIG. 5) between the protruding portions 22e reduces the contact area with the skin in the top sheet 1A, maintains a good touch, and has a good visual impression. From the viewpoint of making it, preferably it is 50 ° or more, particularly preferably 70 ° or more, and preferably 170 ° or less, particularly preferably 130 ° or less, more specifically, preferably 50 ° or more and 170 ° or less, More preferably, it is 70 ° or more and 130 ° or less. In the topsheet 1A, the intersection angle θ2 is 130 °.

  In the topsheet 1A, each of the four protrusions 21e of the X-shaped intermediate embossed portion 21 and the three protrusions 22e of the Y-shaped other embossed portion 22 has the length of the liquid in the topsheet. From the viewpoint of improving drawability and diffusibility and emotional properties, it is preferably 0.5 mm or more, more preferably 0.7 mm or more, and preferably 5.0 mm or less, more preferably 4.0 mm or less, more specifically. Is preferably 0.5 mm or more and 5.0 mm or less, and more preferably 0.7 mm or more and 4.0 mm or less. The four protruding portions 21e of the intermediate embossed portion 21 have the same length from the apex that is the center point of the top portion in the topsheet 1A. On the other hand, the three protruding portions 22e of the other embossed portions 22 have the same length from the apex (the center point of the top portion) in the topsheet 1A. However, it is not limited to the said form and length may differ. For example, two of the three protruding portions 22e of the other embossed portion 22 may have the same length and one may be shorter than the other two. In addition, one protrusion part 22e of the three protrusion parts 22e of the other embossed part 22 is distribute | arranged in parallel with the 2nd direction (Y direction) in 1 A of surface sheets.

Each embossed part 2 (intermediate embossed part 21 and other embossed part 22) has one embossed part 2 (intermediate embossed part) from the viewpoint of improving the drawability and diffusibility of the liquid in the top sheet 1A while maintaining a good touch. area average) parts 21 and other embossed portion 22 is preferably 1 mm ² or more, more preferably 1.5 mm ² or more and, preferably 15 mm ² or less, more preferably 12 mm ² or less, and more specifically, it is preferably 1 mm ² or more 15 mm ² or less, and more preferably 1.5 mm ² or more 12 mm ² or less.

Each embossed portion 2 (intermediate embossed portion 21 and other embossed portion 22) is provided separately and independently at regular intervals in the first direction (X direction) and the second direction (Y direction). Yes. Each embossed part 2 (intermediate embossed part 21 and other embossed part 22) preferably has a density of 1 piece / cm ² from the viewpoint of enhancing the drawability and diffusibility of the liquid in the topsheet 1A and maintaining good touch. More preferably, 2 pieces / cm ² or more, and preferably 32 pieces / cm ² or less, more preferably 16 pieces / cm ² or less, more specifically, 1 piece / cm ² or more and 32 pieces / cm ^2. The number is preferably ² or less and more preferably 2 pieces / cm ² or more and 16 pieces / cm ² or less.

  The distance between the embossed portions 2 (the intermediate embossed portion 21 and the other embossed portions 22) located closest to each other in the first direction (X direction) increases the drawability and diffusibility of the liquid in the topsheet 1A, and looks From the viewpoint of maintaining a good impression and touch, it is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 5.0 mm or less, more preferably 4.0 mm or less, more specifically 0.00. It is preferably 5 mm or more and 5.0 mm or less, and more preferably 1.0 mm or more and 4.0 mm or less.

  As shown in FIG. 5, one hexagonal large polygonal region BT is formed by two intermediate embossed portions 21 and four other embossed portions 22. The two intermediate embossed portions 21 are arranged on a virtual bisector Ly1 extending in parallel with the second direction (Y direction) passing through the center of gravity of the large polygonal region BT in plan view, and the large polygonal region BT Are arranged so as to be symmetric with respect to a virtual bisector Lx1 extending in parallel with a first direction (X direction) passing through the center of gravity. The four other embossed portions 22 are arranged on the top of the large polygonal region BT other than the top on which the two intermediate embossed portions 21 are arranged. The two other embossed portions 22, 22 that are closest to each other in the first direction (X direction) are symmetrical with respect to a virtual bisector Ly1 extending in parallel with the second direction (Y direction) in plan view. It is arranged in. The two other embossed portions 22 and 22 that are closest to each other in the second direction (Y direction) are symmetrical with respect to a virtual bisector Lx1 extending in parallel with the first direction (X direction) in plan view. It is arranged to become. In this way, the two other embossed portions 22 and 22 that are closest to each other in the Y direction constituting one hexagonal large polygon region BT are arranged so as to be opposite to each other with respect to the virtual bisector Lx1. Has been.

  As shown in FIG. 6, one rectangular small polygon region ST is formed by two intermediate embossed portions 21 and two other embossed portions 22. The two intermediate embossed portions 21 are arranged on an imaginary bisector Lx2 extending in parallel with a first direction (X direction) passing through the center of gravity of the small polygonal region ST in plan view. They are arranged so as to be symmetric with respect to a virtual bisector Ly2 extending in parallel with the second direction (Y direction) passing through the center of gravity of the region ST. The two other embossed portions 22 are arranged on a virtual bisector Ly2 extending in parallel to the second direction (Y direction) in plan view, and are virtual extending in parallel to the first direction (X direction). They are arranged symmetrically with respect to the bisector Lx2. In this way, the two other embossed portions 22 and 22 that are closest to the Y direction constituting one rectangular small polygon region ST are opposite to each other with respect to the virtual bisector Lx2. It is arranged in a Y shape and an inverted Y shape.

  As described above, in the topsheet 1A, the tops of the quadrangular small polygonal areas ST are all shared with the tops of the hexagonal large polygonal areas BT adjacent to the small polygonal areas ST. Therefore, as shown in FIG. 4, with respect to the second direction, a row of Y-shaped other embossed portions 22 in which the Y-shaped other embossed portions 22 are arranged at equal intervals in the first direction (X direction), and An X-shaped intermediate embossed portion 21 is provided between the other Y-shaped embossed portions 22 arranged in the first direction (X direction) at equal intervals. A row of intermediate embossed portions 21 arranged at equal intervals in one direction (X direction) is arranged. Such an array of three embossed part rows is arranged at equal intervals in the second direction (Y direction). And about the 1st direction (X direction), the X-shaped intermediate | middle embossed part 21 is distribute | arranged to the position corresponding to the middle of two other Y-shaped other embossed parts 22 and 22 regarding the X direction. . Regarding the second direction (Y direction), the Y-shaped other embossed portion 22 and the reverse Y-shaped other embossed portion 22 adjacent to each other in the Y direction are arranged on a virtual line extending in parallel to the Y direction.

  In the embossed part 2 (intermediate embossed part 21 and other embossed part 22), the constituent fibers of the surface sheet 1A are consolidated, and the height (thickness) of the surface sheet 1A is the highest compared to the unembossed part. It is low (thin). That is, the fiber density of the recessed part by the embossed part 2 (intermediate embossed part 21 and the other embossed part 22) is higher than the part which is not embossed, and is the highest in the surface sheet 1A. Depending on the embossing conditions, the constituent fibers may be melted and solidified to form a film. Therefore, the embossed portion 2 (the intermediate embossed portion 21 and the other embossed portion 22) affects the hardness of the top sheet 1A and the excretion of the excretory fluid. From this viewpoint, the ratio of the area of the embossed portion 2 to the total area of the top sheet, that is, the embossing rate is preferably 5% or more and 30% or less, and particularly preferably 7% or more and 20% or less. According to the embossing pattern in the surface sheet of the present invention, even with such a low embossing rate, the contact area with the wearer's skin can be reduced.

  In the topsheet 1A formed as described above, as shown in FIG. 4, the high convex portion 31 formed in the hexagonal large polygonal region BT is a convex portion having an elliptical planar shape, The low convex portion 32 formed in the small polygonal region ST is a convex portion having a circular planar shape.

The height hb (see FIG. 7) at the apex in the thickness direction (Z direction) of the high convex portion 31 is a viewpoint that the surface sheet 1A has a good touch and enhances the density gradient of the fibers to enhance the drawability of the liquid. Therefore, it is preferably 1.0 mm or more, more preferably 1.5 mm or more, and preferably 7.0 mm or less, more preferably 5.0 mm or less, and more specifically 1.0 mm or more and 7.0 mm or less. It is preferably 1.5 mm or more and 5.0 mm or less. The height hb of the high convex portion 31 is the maximum height of the high convex portion, but is also generally the height at a position corresponding to the center of gravity of the large polygonal region BT. The height hb is measured in the same manner as the fiber density ratio (1) of the surface sheet 1A described later.
Further, the rising angle θ3 (see FIG. 8) from the bottom surface of the high convex portion 31 is preferably 70 ° or more, and more preferably from the viewpoint of making it difficult to leave menstrual blood in a portion that touches the skin even during a large amount of menstrual blood. Is 75 ° or more, and preferably 90 ° or less, more preferably 85 ° or less, more specifically 70 ° or more and 90 ° or less, and more preferably 75 ° or more and 85 ° or less. . The ridge angle θ3 is measured simultaneously with the measurement of the height hb.

The height hs (see FIG. 9) at the apex in the thickness direction (Z direction) of the low convex portion 32 enhances the good feel of the top sheet 1A, and enhances the density gradient of the fibers to enhance the drawability of the liquid. From the viewpoint, it is preferably 0.4 mm or more, more preferably 0.8 mm or more, and preferably 4.5 mm or less, more preferably 2.5 mm or less, more specifically 0.4 mm or more and 4.5 mm or less. It is preferable that it is 0.8 mm or more and 2.5 mm or less. The height hs of the low convex portion 32 is the maximum height of the low convex portion 32, but is also the height at a position corresponding to the center of gravity in the small polygonal region ST. The height hs is measured in the same manner as the fiber density ratio (1) of the surface sheet 1A described later.
Further, the rising angle θ4 (see FIG. 9) from the bottom surface of the low convex portion 32 is preferably 25 ° or more, more preferably from the viewpoint of making it difficult to leave menstrual blood in a portion that touches the skin even during a large amount of menstrual blood. Is 30 ° or more and preferably 70 ° or less, more preferably 65 ° or less, more specifically 25 ° or more and 70 ° or less, and more preferably 30 ° or more and 65 ° or less. . The ridge angle θ4 is measured simultaneously with the measurement of the height hs.

  In the surface sheet 1A, the fiber density of the high convex portion 31 of the three-dimensional dome structure is lower than the fiber density of the low convex portion 32 of the three-dimensional dome structure. Reference point) is the lowest in the top sheet 1A. The low convex portion 32 of the three-dimensional dome structure has the lowest fiber density among the low convex portions 32 at the vertex in the Z direction (the reference point of the height hs). As described above, the fiber density at the apex in the Z direction (height hb reference point) of the high convex portion 31 is lower than the fiber density at the apex in the Z direction (reference point of height hs) of the low convex portion 32. ing. Therefore, the excretory fluid is easily transferred from the high convex portion 31 in contact with the wearer's skin to the low density portion. Furthermore, it is located between the low convex portions 32, 32 adjacent to each other in the first direction (X direction) and is located between the high convex portions 31, 31 adjacent to each other in the second direction (Y direction). The presence of the embossed portion 21 increases the fiber density around the intermediate embossed portion 21. For this reason, since the excretion liquid discharged to the high convex portion 31 having the lowest density that gives cushioning to the skin is likely to penetrate downward from the surface, the top sheet 1A is rapidly moved in the X direction and on the top sheet 1A. Liquid leakage is suppressed without being diffused in the Y direction.

  Ratio (db / ds) of the fiber density db at the vertex in the Z direction (reference point for height hb) of the high convex portion 31 to the fiber density ds at the vertex in the Z direction (reference point for height hs) of the low convex portion 32 ) Is preferably 1.2 times or more, more preferably 1.5 times or more, and preferably 3.0 times or less, more preferably 2.5 times from the viewpoint of enhancing the drawability of excreted body fluid. More specifically, it is preferably 1.2 times or more and 3.0 times or less, and more preferably 1.5 times or more and 2.5 times or less.

The ratio of the fiber density of the top sheet 1A can be measured using either one of the two methods (1) and (2) described below.
(1) When the basis weight of the top sheet 1A is substantially uniform (uniform) (or can be determined to be substantially uniform), the height (thickness) of the cut surface of the top sheet 1A is measured.
(2) When the basis weight of the top sheet 1A is non-uniform (or can be determined to be non-uniform), the average distance between fibers on the cut surface of the top sheet 1A is measured.

Here, the determination as to whether the basis weight of the topsheet 1A is substantially uniform is performed as follows.
When 10 or more cut samples having a size of 10 cm in the Y direction and 10 cm in the X direction are taken out from the top sheet 1A and each basis weight is measured, the triple value (3σ) of the standard deviation σ is within 10% of the average μ. If there is no fiber unevenness on the appearance, it is judged to be substantially uniform. However, it is preferable to make a comprehensive judgment in consideration of various factors such as the composition being different in a minute region.

First, the method (1) will be described.
A sample for measuring the high convex portion 31 by cutting from the top sheet 1A in plan view along a straight line passing through the center of gravity (vertex in the Z direction) of the high convex portion 31 and the two embossed portions 2 (intermediate embossed portion 21) at both ends. Create Similarly, the low convex portion 32 is cut by a straight line passing through the center of gravity (vertex in the Z direction) and the two embossed portions 2 (two intermediate embossed portions 21 or two other embossed portions 22) at both ends. A sample for measuring the convex portion 32 is created. At this time, care should be taken not to cause a decrease in the height of each measurement sample due to cutting.

The cross section of each measurement sample obtained was measured using an electron microscope JCM-5100 manufactured by JEOL Ltd. under the conditions of a sputtering time of 30 seconds (Pt) and an acceleration voltage of 10 KV. At least one of the embossed portions 2 is photographed, or a situation where the embossed portions 2 can be understood by combining a plurality of images is measured, and the height (thickness) of each measurement sample is measured from the photographed images. Note that the image measurement may be performed using either a printed matter or a PC screen.
In the method (1), the height hb (thickness) of the central portion of the sample for measuring the high convex portion 31 is divided by the height hs (thickness) of the central portion of the sample for measuring the low convex portion 32 to obtain the density. The ratio (db / ds) is used.

Next, the method (2) will be described.
The cross section is measured in the same manner as in the method (1). In addition to the measurement performed by the method (1), the cross section of each measurement sample is photographed at an enlargement magnification of 500 to 1000 times. In the region where the number of fibers is 3 to 7 in the width direction (plane direction) at the target measurement site (center portion of each measurement sample) of each of the magnified images, an image analyzer (NEWQBE ver. 4.20 made by NEXT) Is used to find the distance between the nearest centers of gravity of the fibers.
In the above measurement, measurement is performed almost entirely in the height (thickness) direction, and the closest distance between the centers of gravity is not caused to overlap. Moreover, about a cross section, it measures at least 3 places, Preferably 5 places, More preferably, 10 places, The average value is used.
In the method of (2), the distance ratio between the nearest centroids at the center of the sample for measuring the high convex portion 31 is divided by the distance between the nearest centroids at the center of the sample for measuring the low convex portion 32. db / ds).

The material for forming the sanitary napkin 10 used in the above-described top sheet for the absorbent article of the present invention will be described.
First, a material for forming the top sheet 1A will be described.
As the non-heat-shrinkable fiber layer 1u made of non-heat-shrinkable fibers, for example, a web formed by a card method or a bulky nonwoven fabric is preferably used. As the bulky nonwoven fabric, it is possible to give the topsheet 1A a desired density gradient, and from the viewpoint that it is possible to bring a good texture to the topsheet 1A, an air-through nonwoven fabric, an airlaid nonwoven fabric, A resin bond nonwoven fabric is preferably used. The web formed by the card method is a fiber assembly in a state before being made into a nonwoven fabric. That is, a fiber assembly in a state where fibers are extremely loosely entangled in a state where a post-processing applied to a card web used for manufacturing a nonwoven fabric, for example, a heat-sealing process by an air-through method or a calendar method is not performed. It is the body. When a web formed by the card method is used as the non-heat-shrinkable fiber layer 1u, the non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d are joined simultaneously or after being joined, and then the non-heat-shrinkable fiber layer 1u. Heat-bond the fibers inside.
As the non-heat-shrinkable fiber that is a constituent fiber of the non-heat-shrinkable fiber layer 1u, if it is a fiber that does not substantially have heat-shrinkability or has a higher heat-shrink temperature than the lower layer (heat-shrinkable fiber layer), Usually, those used for absorbent articles such as sanitary napkins and disposable diapers can be used without particular limitation.
The basis weight of the non-heat-shrinkable fiber layer 1u is preferably 10 g / m ² or more, more preferably 15 g / m ² or more, from the viewpoint of forming a sufficient density gradient and improving the feel of the topsheet 1A. , Preferably 50 g / m ² or less, more preferably 40 g / m ² or less, and more specifically preferably 10 g / m ² or more and 50 g / m ² or less, more preferably 15 g / m ² or more and 40 g / m ² or less. More preferably.

As the heat-shrinkable fiber layer 1d containing heat-shrinkable fibers, a web formed by a card method or a non-woven fabric having heat-shrinkability can be used.
As the heat-shrinkable fibers of the constituent fibers of the heat-shrinkable fiber layer 1d, those made of a thermoplastic polymer material and having heat-shrinkability are preferably used. Examples of such fibers include latently crimpable fibers. The latent crimpable fiber can be handled in the same manner as a conventional nonwoven fabric fiber before being heated, and has a property that a helical crimp is developed and contracted by heating at a predetermined temperature. Fiber. The content ratio of the heat-shrinkable fiber in the heat-shrinkable fiber layer 1d is preferably 40% by mass or more and 100% by mass or less.

The latent crimpable fiber, which is a heat-shrinkable fiber, is composed of, for example, an eccentric core-sheath type or side-by-side type composite fiber composed of two types of thermoplastic polymer materials having different shrinkage rates. Examples thereof include those described in JP-A-9-296325 and Japanese Patent No. 2759331. The heat-shrinkable fiber layer 1d includes, for example, such latently crimpable fibers, and simultaneously or after heat fusion with the non-heat-shrinkable fiber layer 1u, causes the fibers to crimp. Can be shrunk. The basis weight of the heat-shrinkable fiber layer 1d is preferably 10 g / ^{m 2} or more, more preferably 15 g / ^{m 2} or more, and preferably 50 g / ^{m 2} or less, more preferably 40 g / ^{m 2} or less, more specifically Is preferably 10 g / m ² or more and 50 g / m ² or less, and more preferably 15 g / m ² or more and 40 g / m ² or less.

  A topsheet 1A according to an embodiment of the present invention has, for example, a non-heat-shrinkable fiber layer 1u containing non-heat-shrinkable fibers as an upper layer and a heat-shrinkable fiber layer 1d made of heat-shrinkable fibers before shrinking as a lower layer. At the same time as the overlapping, a plurality of embossed portions 2 (intermediate embossed portion 21 and other embossed portions 22) are partially bonded together in a predetermined regular pattern, or at the same time, both are bonded together, and then heat is applied to heat-shrink fibers in the lower layer It is formed by thermally shrinking the layer 1d in the horizontal direction. Since the non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d are intermittently bonded and integrated by the embossed portion 2 (the intermediate embossed portion 21 and the other embossed portion 22), the heat-shrinkable fiber layer 1d is heat-shrinked. As a result, the non-heat-shrinkable fiber layer 1u is entangled and strain is generated in an attempt to shrink. This distortion protrudes in a convex shape toward the non-heat-shrinkable fiber layer 1u, and a plurality of three-dimensional dome-shaped convex portions 3 are formed. The bonding (heat fusion) by the embossed portion 2 is, for example, a plurality of substantially X-shaped and substantially Y-shaped so as to correspond to the arrangement of the X-shaped intermediate embossed portion 21 and the Y-shaped other embossed portion 22. A non-heat-shrinkable fiber layer 1u in a laminate of a non-heat-shrinkable fiber layer 1u and a heat-shrinkable fiber layer 1d is formed on an embossed surface (such as a circumferential surface of an embossing roll) in which embossed pins having a cross section are arranged in a predetermined pattern. The non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d are melted at the portion that is pressed from the side and heat-pressed by each embossed spin.

  The heat shrinkage of the heat-shrinkable fiber layer 1d is, for example, that the heat-shrinkable fiber layer 1d is composed of only one or more kinds of heat-shrinkable fibers, or one or more kinds of heat-shrinkable in the heat-shrinkable fiber layer 1d. The fibers are contained, and the non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d are bonded together or after the non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d are bonded together, the heat-shrinkable fiber layer 1d Is carried out by heat treatment.

  At the time of heat shrinkage, in the topsheet 1A, the large polygonal region BT surrounded by the six embossed portions 2 (two intermediate embossed portions 21 and four other embossed portions 22) has the widest region. Therefore, it is difficult to be suppressed by the six embossed portions 2, and it is easy to be raised, and the highest high convex portion 31 is obtained. Further, since the small polygonal region ST surrounded by the four embossed portions 2 (two intermediate embossed portions 21 and two other embossed portions 22) is narrow, the heat-shrinkable fiber layer 1d is thermally contracted in the horizontal direction. However, since the bulge is suppressed by the four embossed portions 2, the low convex portion 32 is lower than the high convex portion 31.

The surface sheet 1A formed by laminating the non-heat-shrinkable fiber layer 1u and the heat-shrinkable fiber layer 1d by the method described above has a basis weight of preferably 20 g / m ² or more, more preferably 35 g / m ² or more. And it is preferably 100 g / m ² or less, more preferably 80 g / m ² or less, and more specifically preferably 20 g / m ² or more and 100 g / m ² or less, and more preferably 35 g / m ² or more and 80 g / m ^2. More preferably, it is as follows.

  Moreover, as the back surface sheet 12, the absorber 13, and the side sheet 14 that constitute the absorbent main body 11, as long as they are usually used for absorbent articles such as sanitary napkins and disposable diapers, they are used without particular limitation. be able to. For example, as the back sheet 12, a liquid-impermeable or water-repellent resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used. For example, as the absorbent body 13, an aggregate of fibers such as pulp fibers (which may be a nonwoven fabric) or an absorbent core in which water-absorbing polymer particles are held by the absorbent core 13 is made of water-permeable thin paper or nonwoven fabric. Those coated with a core wrap sheet can be used. For example, as the side sheet 14, the same sheet as the back sheet 3 can be used.

  For fixing the top sheet 1A, the back sheet 3, the absorbent body 4 and the side sheets 5, there are usually adhesive means used for absorbent articles such as disposable diapers and fusion means such as heat embossing, ultrasonic embossing, and high frequency embossing. Used.

The effect at the time of using the surface sheet 1A of embodiment of this invention mentioned above for the sanitary napkin is demonstrated.
As shown in FIG. 3, the top sheet 1 </ b> A has a plurality of high convex portions 31 having a high height and a plurality of low convex portions 32 having a low height. Therefore, when the sanitary napkin 10 is worn, the high convex portion 31 comes into contact with the skin, but the low convex portion 32 arranged between the high convex portions 31 hardly comes into contact with the skin. Therefore, when the topsheet 1A is used for the sanitary napkin 10, the contact area with the wearer's skin can be further reduced while maintaining the original soft texture of the nonwoven fabric, and stickiness and stuffiness can be further reduced. it can. Moreover, 1 A of surface sheets of 1st Embodiment can further reduce a contact area with a wearer's skin, and can reduce the damage to skin. The contact area between the topsheet 1A and the wearer's skin is preferably 45% or less, particularly 42% or less for the above-mentioned reasons, and the lower limit is preferably 25% or more, particularly 30% or more.

  Further, as shown in FIG. 3, the top sheet 1 </ b> A is devised in the arrangement of the low convex portions 32 that are lower than the high convex portions 31. Specifically, a large polygon region row BTL formed by arranging a plurality of large polygon regions BT adjacent to each other along a first direction (X direction), and a plurality of small polygon regions STL in the first direction. Small polygonal region rows STL arranged adjacent to each other along (X direction) are alternately arranged in a second direction (Y direction) orthogonal to the first direction (X direction). . Therefore, even if the low convex part 32 formed in each small polygon area | region STL which comprises each small polygon area | region row | line | column STL is mounted | worn with wearing pressure, it is regularly arranged large polygon area | region BT. It is protected by the high convex portion 31 formed inside, and is not easily crushed in the thickness direction. Moreover, in the pattern of large and small convex portions of Patent Document 2 as shown in FIG. 15, there is a region affected by the large convex portions 320 and 320 between the low convex portions 330 and 330, whereas the surface sheet In 1A, there is no region susceptible to the influence of the high convex portion 31 between the adjacent low convex portions 32 in the low convex portion row 32L, particularly at an intermediate position. For this reason, since the small polygonal region row STL is composed of a plurality of low convex portions 32 and a region having a lower height existing between them, a passage for air and steam is ensured and effective in suppressing sag, Liquid diffusion in the second direction (Y direction) is easily suppressed.

  Further, as shown in FIG. 3, the top sheet 1 </ b> A is further devised in the arrangement of the low convex portions 32 that are lower than the high convex portions 31. Specifically, the high convex portion row 32L and the low convex portion row 33L formed along the first direction (X direction) corresponding to the lateral direction of the napkin 10 are the second direction (Y direction) corresponding to the vertical direction. Alternatingly arranged. And the intermediate embossed part 21 is arrange | positioned so that it may be located in the low convex part row | line | column 32L in the intermediate part of the two high convex parts 31 and 31 nearest in the vertical direction (Y direction). For this reason, there is no high ridge portion between the two high convex portions 31 and 31 that are closest to each other in the second direction (Y direction), and the high embossed portions 31 and 31 are low intermediate embossed portions. Therefore, it is suppressed that the excretory fluid is rapidly diffused in the Y direction through the high convex portion 31 having a low fiber density. In addition, the intermediate embossed portion 21 imparts a fiber density gradient to the top sheet 1A to increase the drawability of the liquid, and has an effect of reducing stickiness and stuffiness. On the other hand, the two low convex portions 32, 32 closest to each other in the first direction (X direction) are different from the high convex portion 31 in the vertical direction (Y direction) and the horizontal direction (X direction) due to the presence of the intermediate embossed portion 21. ) In both directions. For this reason, even if the low convex part 32 applies mounting pressure by wearing and the high convex part 31 is crushed in the thickness direction, it is hard to receive the influence. On the other hand, the high convex portion 31 surrounded by the intermediate embossed portion 21 and the low convex portion 32 is resistant to mounting pressure and therefore is not easily crushed. Such a mechanism makes it easy to keep the contact area between the skin of the wearer wearing and the topsheet 1A small, and since the air passage by the low convex row 32L is secured, it is difficult to be sticky and stuffy. It is easy to be suppressed.

  In the topsheet 1A, as shown in FIG. 4, a plurality of low convex portions 32 are arranged in a row via intermediate embossed portions 21 adjacent in the first direction (X direction). Thus, the lower embossed portion 21 having a lower height exists between the low convex portions 32 and 32 located at the closest position, and the low convex portion row 32L is formed, so that the low convex portion row is formed. Since the flow of air and water vapor along 33L can be ensured, it becomes easy to suppress stuffiness while the napkin 10 is worn. When the intermediate embossed portion 21 is formed of only one, the effect is higher.

  Further, as shown in FIG. 3, the top sheet 1A is formed by disposing the non-heat-shrinkable fiber layer 1u on the skin contact surface side and the heat-shrinkable fiber layer 1d on the non-skin contact surface side. . Therefore, toward the heat-shrinkable fiber layer 1d where the fiber density has increased due to the shrinkage, the excreted body fluid is quickly drawn from the skin contact surface side to the non-skin contact surface side by capillary force, reducing stuffiness. There is an effect.

Next, a surface sheet (hereinafter also referred to as “surface sheet 1B”) as a second embodiment of the surface sheet of the present invention will be described with reference to FIG.
About the surface sheet 1B of 2nd Embodiment, a different point from the surface sheet 1A of 1st Embodiment is demonstrated. For the points that are not particularly described, the description of the top sheet 1A is applied as appropriate. Moreover, about the effect of the surface sheet 1B, a different point from the effect of the surface sheet 1A mentioned above is demonstrated, and the point which is not demonstrated in particular is the same as the effect of the surface sheet 1A mentioned above.

  In the surface sheet 1B, as shown in FIG. 10, each small polygon area | region ST is formed in a hexagon, and each large polygon area | region BT is formed in the hexagon. The tops of the hexagonal small polygon regions ST are all shared with the tops of the hexagonal large polygon regions BT adjacent to the small polygon region ST. One hexagonal large polygonal region BT is formed by two intermediate embossed portions 21 and four other embossed portions 22. One hexagonal small polygon region ST is formed by two intermediate embossed portions 21 and two other embossed portions 22. The intermediate embossed portion 21 of the topsheet 1B forms the outer shape of each large polygon region BT from the apexes (center point of the top portion) of the two large polygon regions BT and BT that are closest to the second direction (Y direction). A two-direction extending shape portion 21a extending along the side is provided. Each intermediate embossed portion 21 of the topsheet 1B includes two two-way extending shape portions 21a. One bi-directionally extending shape portion 21a extends along the side forming the outer shape of one hexagonal large polygonal region BT adjacent in the second direction (Y direction) from the apex (center point of the top). The protrusion 21e is formed in a V shape extending. The other two-direction extending shape portion 21a extends along the side forming the outer shape of the other hexagonal large polygonal region BT adjacent in the second direction (Y direction) from the apex (the center point of the top). The protruding portion 21e is formed in an inverted V shape. Each intermediate embossed portion 21 of the topsheet 1B has a V-shaped bi-directionally extending shape portion 21a, an inverted V-shaped bi-directionally extending shape portion 21a, and a rectangular shape arranged independently at these intermediate positions. It consists of the shape independent embossed part 21b. Therefore, in the present embodiment, one intermediate embossed portion 21 is composed of three embossed units. However, the distance between each embossed unit is made sufficiently small. It can be regarded as a single intermediate embossed portion 21. A preferred distance between the embossed units in one intermediate embossed portion 21 is 1 mm or less, particularly 0.5 mm or less.

  The advantage of the topsheet 1B is that it is easy to increase the area of the small polygonal region ST, so that the contact area between the topsheet 1B and the skin is easier to make than the topsheet 1A of the first embodiment. It is a point. On the other hand, in the top sheet 1A of the first embodiment, the two-direction extending shape portions 21a, 21a adjacent to each other in the second direction (Y direction) are in contact with each other, and the intermediate embossed portion 21 is formed from one X-shaped emboss. Since it is comprised, the embossing rate can be made low and it is excellent in the draw-in property and the feel of a liquid.

Next, a surface sheet (hereinafter also referred to as “surface sheet 1C”) as a third embodiment of the surface sheet of the present invention will be described with reference to FIG.
Regarding the topsheet 1C of the third embodiment, differences from the topsheet 1A of the first embodiment will be described. For the points that are not particularly described, the description of the top sheet 1A is applied as appropriate. Moreover, about the effect of 1 C of surface sheets, a different point from the effect of 1 A of surface sheets mentioned above is demonstrated, and the point which is not demonstrated in particular is the same as the effect of 1 A of surface sheets mentioned above.

  In the topsheet 1C, as shown in FIG. 11, each small polygon region ST is formed in a hexagon, and each large polygon region BT is formed in a hexagon. The tops of the hexagonal small polygon regions ST are all shared with the tops of the hexagonal large polygon regions BT adjacent to the small polygon region ST. One hexagonal large polygonal region BT is formed by two intermediate embossed portions 21 and four other embossed portions 22. One hexagonal small polygon region ST is formed by two intermediate embossed portions 21 and two other embossed portions 22. The intermediate embossed portion 21 of the top sheet 1C forms the outer shape of each large polygon region BT from the apexes (center point of the top portion) of the two large polygon regions BT and BT that are closest to each other in the second direction (Y direction). A two-direction extending shape portion 21a extending along the side is provided. Each intermediate embossed portion 21 of the topsheet 1C includes two two-way extending shape portions 21a. One bi-directionally extending shape portion 21a extends along the side forming the outer shape of one hexagonal large polygonal region BT adjacent in the second direction (Y direction) from the apex (center point of the top). The protrusion 21e is formed in a V shape extending. The other two-direction extending shape portion 21a extends along the side forming the outer shape of the other hexagonal large polygonal region BT adjacent in the second direction (Y direction) from the apex (the center point of the top). The protruding portion 21e is formed in an inverted V shape. Each intermediate embossed portion 21 of the topsheet 1C has a V-shaped bi-directionally extending shape portion 21a, an inverted V-shaped bi-directionally extending shape portion 21a, and a rectangular connection parallel to the Y direction connecting them. It consists of the embossed part 21c.

  The advantage of the topsheet 1C is that it is easy to increase the area of the small polygonal region ST, and therefore it is easy to make the contact area between the topsheet 1C and the skin smaller than the topsheet 1A of the first embodiment. It is a point. On the other hand, in the top sheet 1A of the first embodiment, the two-direction extending shape portions 21a, 21a adjacent to each other in the second direction (Y direction) are in contact with each other, and the intermediate embossed portion 21 is formed from one X-shaped emboss. Since it is comprised, the embossing rate can be made low and it is excellent in the draw-in property and the feel of a liquid.

  The top sheet for absorbent articles of the present invention is not limited to the top sheet 1A of the first embodiment to the top sheet 1C of the third embodiment, and can be changed as appropriate. Moreover, each component in the above-mentioned surface sheet 1A thru | or surface sheet 1C can be implemented in combination suitably, in the range which does not impair the meaning of this invention.

  For example, the surface sheet 1A described above has a two-layer structure in which the non-heat-shrinkable fiber layer 1u is disposed on the skin contact surface side and the heat-shrinkable fiber layer 1d is disposed on the non-skin contact surface side. Alternatively, a single-layer structure composed of only the heat-shrinkable fiber layer 1d may be used. Further, a non-heat-shrinkable fiber layer 1u may be laminated on both surfaces of the heat-shrinkable fiber layer 1d to form a three-layer structure.

  Moreover, in the surface sheet 1A of the first embodiment to the surface sheet 1C of the third embodiment described above, the protrusions 21e of the intermediate embossed part 21 and the protrusions 22e of the other embossed part 22 are all formed of straight lines. However, instead of this, a curved shape as shown in FIGS. 12 and 13 may be adopted. Specifically, in the X-shaped intermediate embossed portion 21 shown in FIG. 12, the V-shaped contour formed by two adjacent protruding portions 21 e is respectively the apex (the center point of the top portion) of the intermediate embossed portion 21. ) Toward the inside. In addition, in the Y-shaped other embossed portion 22 shown in FIG. 12, the V-shaped contour formed by the two adjacent projecting portions 22 e faces the apex (center point of the top portion) of the other embossed portion 22. And has an inwardly convex curved shape. Next, in the X-shaped intermediate embossed portion 21 shown in FIG. 13, the contours of the four projecting portions 21e are curved outwardly convex toward the small polygon region ST or the large polygon region BT, respectively. It has become. Further, in the other embossed portion 22 of the Y shape shown in FIG. 13, the contours of the three protruding portions 22e are curved outwardly convex toward the small polygon region ST or the large polygon region BT, respectively. It has become. In particular, the intermediate embossed portion 21 and the other embossed portion 22 having a curved shape as shown in FIG. 13, the hem portion of the convex portion 3 is partitioned at the position where the embossed portion 2 exists, and the embossed portion 2 exists. Since it is difficult to influence the height of the convex portion in the adjacent polygonal region or the region between the convex portion and the convex portion through the portion that does not, the above-described effect can be achieved, and further from a visual viewpoint Is also preferable. In the case of the intermediate embossed portion 21 and the other embossed portion 22 having curved shapes as shown in FIGS. 12 and 13, the intersecting angle θ <b> 1 between the protruding portions 21 e constituting the intermediate embossed portion 21 is the inner intersection of the protruding portions 21 e. This is an angle formed by two imaginary lines drawn from the portion toward the tip of each protrusion 21e. Further, the intersection angle θ2 between the projecting portions 22e constituting the other embossed portion 22 is an angle formed by two imaginary lines drawn from the inner intersection portion of the projecting portions 22e toward the tip of each projecting portion 22e. . The preferred angles of the intersection angles θ1 and θ2 are as described above.

The following surface sheet for absorbent articles is disclosed further regarding embodiment mentioned above.
A heat-shrinkable fiber layer containing heat-shrinkable fibers and a topsheet for an absorbent article in which a plurality of embossed portions are formed, and a large polygonal region surrounded by the plurality of embossed portions A plurality of the embossed portions that form the top of the large polygonal region, and are surrounded by the embossed portions that form the tops of the plurality of large polygonal regions, and a small polygonal region having a smaller area than the large polygonal region And the embossed part also forms the top of the small polygonal area, a high convex part is formed in each of the large polygonal areas, and the high convex part is formed in each of the small polygonal areas. A plurality of the large polygonal regions are arranged adjacent to each other along the first direction, and a plurality of the small polygons are formed. Regions are arranged adjacent to each other along the first direction. The top sheet for absorbent articles in which the small polygonal region rows are alternately arranged in a second direction orthogonal to the first direction.
[2] A plurality of high convex portions arranged by arranging a plurality of the high convex portions along the first direction, and a low convex portion constituted by arranging a plurality of the low convex portions along the first direction. The rows are alternately arranged in a second direction orthogonal to the first direction, and the embossed portion is between the two high convex portions located closest to the second direction, and The top sheet for absorbent articles according to [1], wherein an intermediate embossed portion is provided between the two low convex portions located closest to each other in the first direction.
[3] The top sheet for absorbent articles according to [2], wherein only one intermediate embossed portion exists between the two low convex portions located closest to each other in the first direction. .
[4] The embossed portions constituting the small polygonal region are all shared with the embossed portions constituting the plurality of large polygonal regions adjacent to the small polygonal region. ] The surface sheet of description.
[5] The top sheet according to any one of [1] to [4], wherein the large polygonal region is formed in a hexagon and the small polygonal region is formed in a quadrangle.
[6] The intermediate embossed portion extends in two directions extending along a side forming the outer shape of each large polygonal region from the center point of the tops of the two large polygonal regions located closest to the second direction. The top sheet according to any one of [2] to [5], wherein the topsheet includes an extended shape portion.
[7] The two large polygonal regions that are closest to each other in the second direction share one apex, and the intermediate embossed portion has an outer shape of one large polygonal region from the center point of the apex. And extending in a four-direction extending shape extending along the side forming the outer shape of the other large polygonal area from the center point of the top portion. Thru | or the surface sheet as described in any one of [6].
[8] The embossed portion excluding the intermediate embossed portion includes the small polygon region from the center point of the top portion in the small polygon region sharing one top portion and the two large polygon regions adjacent in the first direction. Forming the outer shape of the rectangular region and extending along the side forming the outer shape of one of the large polygonal regions, and forming the outer shape of the small polygonal region from the center point of the top and the other Extending along the side forming the outer shape of the large polygonal region, and forming the outer shape of one of the large polygonal regions and along the side forming the outer shape of the other large polygonal region The topsheet according to any one of [2] to [7], wherein the topsheet is formed in a three-direction extending shape.
[9] The top sheet according to any one of [2] to [8], wherein the embossed portion includes the X-shaped intermediate embossed portion and the Y-shaped other embossed portion.
[10] The high convex portion row is provided with the Y-shaped embossed portion, and the low convex portion row is provided with the X-shaped embossed portion. Surface sheet.
[11] The intermediate embossed portion includes a V-shaped bi-directionally extending shape portion, an inverted V-shaped bi-directionally extending shape portion, and an independent embossed portion arranged independently at the intermediate position. The top sheet according to any one of [2] to [8].
[12] The top sheet according to [11], wherein the independent embossed portion is rectangular.
[13] A non-heat-shrinkable fiber layer made of non-heat-shrinkable fibers laminated on the heat-shrinkable fiber layer, wherein the heat-shrinkable fiber layer and the non-heat-shrinkable fiber layer are intermittently formed by the plurality of embossed portions. The surface sheet according to any one of [1] to [12], which is bonded to each other.

[14] The top sheet of an absorbent article according to [13], wherein the non-heat-shrinkable fiber layer is disposed on the skin contact surface side, and the heat-shrinkable fiber layer is disposed on the non-skin contact surface side.
[15] The [1] to [14], wherein the adjacent high convex portion and the low convex portion are arranged along an oblique direction in both the first direction and the second direction. The surface sheet as described in one.
[16] Any one of [1] to [15], wherein an outline of the protruding portion of the embossed portion has a curved shape protruding outward toward the small polygon region or the large polygon region. The surface sheet as described in 2.
[17] The topsheet according to any one of [1] to [16], wherein a density of the embossed portion is 1 piece / cm ² or more and 32 pieces / cm ² or less.
[18] The top sheet according to any one of [1] to [17], wherein an intersection angle of the projecting portion of the embossed portion is 50 ° or more and 170 ° or less.
[19] The topsheet according to any one of [1] to [18], wherein the embossed portion has an area of 1 mm ² or more and 15 mm ² or less.
[20] The top sheet according to any one of [1] to [19], wherein a height of the high convex portion at a vertex in the Z direction is 1.0 mm or greater and 7.0 mm or less.
[21] The top sheet according to any one of [1] to [20], wherein a height of the low convex portion at an apex in the Z direction is not less than 0.4 mm and not more than 4.5 mm.

[22] An absorbent article comprising the top sheet according to any one of [1] to [21].
[23] The absorbent article includes a longitudinal direction corresponding to a wearer's front-rear direction and a lateral direction orthogonal thereto, and the high convex portion row and the low convex portion row are along the lateral direction. The absorbent article according to [22], which is disposed.
[24] The absorptive article further includes a back sheet and an absorbent body, and the back sheet extends in a longitudinal edge direction in the longitudinal direction as compared with the top sheet. Absorbent articles.
[25] The absorbent article according to any one of [20] to [24], wherein the absorbent article is a sanitary napkin.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

[Production of non-heat-shrinkable fiber layer 1u]
A card web having a basis weight of 18 g / m ² is manufactured by a card method using a core-sheath type composite fiber [NBF (SH) (trade name), 2.2 dtex × 51 mm] manufactured by Daiwa Boseki Co., Ltd. as an upper layer. The non-heat-shrinkable fiber layer 1u was used. The core-sheath type composite fiber has polyethylene terephthalate as a core component and polyethylene as a sheath component.

[Production of heat-shrinkable fiber layer 1d]
A card web having a basis weight of 22 g / m ² is manufactured by a card method using heat shrinkable fiber [L (V) (trade name), 2.2 dtex × 51 mm] of Daiwa Boseki Co., Ltd. Used as the shrinkable fiber layer 1d.

[Example 1]
The surface sheet for absorbent articles shown in FIG. 4 was produced. As shown in FIG. 4, a large polygon region row BTL in which a plurality of large polygon regions BT are arranged adjacent to each other along the X direction, and a plurality of small polygon regions STL are adjacent to each other along the X direction. Are arranged alternately in the Y direction. The embossed portion 2 includes an intermediate embossed portion 21 and another embossed portion 22. The intermediate embossed portion 21 has an X shape with four protruding portions, and the other embossed portion 22 has a Y shape with three protruding portions. The shape of the embossed portion 2 is a combination of the X-shaped intermediate embossed portion 21 and the Y-shaped other embossed portion 22, and is a laminate in which the non-heat-shrinkable fiber layer 1 u is superimposed on the heat-shrinkable fiber layer 1 d. Emboss bonding was performed from the upper layer side in the pattern shown in FIG. After embossing the laminate, hot air of 110 ° C. ± 10 ° C. is allowed to pass for 5 to 10 seconds to crimp the lower layer heat-shrinkable fibers, shrink the lower layer, and protrude the upper layer into a convex shape. A surface sheet having a high convex portion 31 and a low convex portion 32 having a dome structure was produced. The embossed portions 2 are arranged at 6 pieces / cm ² , and the closest distance between two adjacent embossed portions 2 in the first direction (X direction) of the surface sheet after heat shrinkage is 1.1 mm, The average area of the embossed part 21 was 2.3 mm ² , and the average area of the other embossed part 22 was 1.6 mm ² . Further, the four protruding portions of the X-shaped intermediate embossed portion and the three protruding portions of the Y-shaped other embossed portion were the same 0.85 mm. Moreover, the height hb of the high convex part 31 was 2.3 mm, and the height hs of the low convex part 32 was 1.5 mm. Moreover, the crossing angle θ1 between the protrusions constituting the intermediate embossed part was 90 °, and the crossing angle θ2 between the protrusions constituting the other embossed part was 130 °.

[Comparative Example 1]
A surface sheet 100A shown in FIG. 14 was produced. As shown in FIG. 14, the shape of the embossed portion 200 is only an X-shape composed of four rod-like bodies having the same length from the center point, and the non-heat-shrinkable fiber layer 1u is formed on the heat-shrinkable fiber layer 1d. 14 was emboss-bonded from the upper layer side of the laminated body with the pattern shown in FIG. 14, and only a portion that became a quadrangular convex portion 300 surrounded by the four embossed portions 200 was formed. After embossing the laminate, hot air of 110 ° C. ± 10 ° C. is allowed to pass for 5 to 10 seconds to crimp the lower layer heat-shrinkable fibers, shrink the lower layer, and protrude the upper layer into a convex shape. A top sheet 100A having only the convex part 300 of the dome structure was produced. The embossed portions 200 are arranged at 7.1 pieces / cm ² , and the distance between the two adjacent embossed portions 200 at the shortest distance of the surface sheet 100A after heat shrinkage is 1.6 mm, and the area of the embossed portion 200 is It was 3.2 mm ² . Moreover, the length of four rod-shaped bodies was the same 1.2 mm. Further, the crossing angle θ between the rod-shaped bodies in the Y direction was 90 °.

[Comparative Example 2]
A surface sheet 100B shown in FIG. 15 was produced. As shown in FIG. 15, the shape of the embossed portion 200 is only circular, and emboss bonding is performed in the pattern shown in FIG. 15 from the upper layer side of the laminate in which the non-heat-shrinkable fiber layer 1u is superimposed on the heat-shrinkable fiber layer 1d. Then, a portion to be an octagonal large convex portion 320 surrounded by eight embossed portions 200 and a portion to be a quadrangular small convex portion 330 surrounded by four embossed portions 200 were formed. The plurality of octagonal regions are arranged adjacent to each other along the X direction, but the plurality of quadrangular regions are not arranged adjacent to each other along the X direction. Arranged at intervals in the direction. After embossing the laminate, hot air of 110 ° C. ± 10 ° C. is allowed to pass for 5 to 10 seconds to crimp the lower layer heat-shrinkable fibers, shrink the lower layer, and protrude the upper layer into a convex shape. A topsheet 100B having a large convex portion 320 and a small convex portion 330 having a dome structure was produced. The embossed portions 200 are arranged at 5.5 pieces / cm ² , and the interval between two adjacent embossed portions 200 at the shortest distance of the surface sheet 100A after heat shrinkage is 1.1 mm, and the area of the embossed portion 200 is It was 3.1 mm ² .

[Reference Example 1]
A top sheet 100S shown in FIG. 16 was produced. As shown in FIG. 16, the shape of the embossed portion 200 is only a Y-shape consisting of two rod-like bodies 200a, 200b having a long length from the center point and one rod-like body 200c having a short length. Emboss adhesion was performed in the pattern shown in FIG. 16 from the upper layer side of the laminate in which the non-heat-shrinkable fiber layer 1u was superimposed on the shrinkable fiber layer 1d. After embossing the laminate, hot air of 110 ° C. ± 10 ° C. is allowed to pass for 5 to 10 seconds to crimp the lower layer heat-shrinkable fibers, shrink the lower layer, and protrude the upper layer into a convex shape. A topsheet 100S having a high convex portion 320, a middle convex portion 310, and a low convex portion 330 having a dome structure was produced. The embossed portions 200 are arranged at 6 pieces / cm ² , and the closest distance between two adjacent embossed portions 200 in the first direction (X direction) of the topsheet 100S after heat shrinkage is 1.1 mm. The area of the embossed part 200 was 3.9 mm ² . Moreover, the length of the two rod-shaped bodies 200a and 200b was 2.8 mm, and the length of the one rod-shaped body 200c was 0.85 mm. Further, the height hb of the high convex portion 320 was 2.3 mm, the height ha of the middle convex portion 310 was 1.3 mm, and the height hc of the low convex portion 330 was 0.8 mm. Further, the intersection angle θ between the rod-shaped body 200a and the rod-shaped body 200b is 110 °, the intersection angle θ between the rod-shaped body 200a and the rod-shaped body 200c is 125 °, and the intersection angle θ between the rod-shaped body 200b and the rod-shaped body 200c is 125 °. there were.

[Performance evaluation]
About each surface sheet of Example 1, Comparative Examples 1-2 and Reference Example 1, according to the following method, (1) contact area ratio with skin, (2) surface liquid returnability, (3) liquid flowability, (4) The coefficient of friction with the skin, (5) feel, and (6) the ratio of the area of the high protrusion to the area of the low protrusion (area of the high protrusion / area of the low protrusion) were evaluated. The evaluation environment was a room temperature of 20 ° C. and a humidity of 60% RH. The results are shown in Table 1 below.

(1) Contact area ratio with skin [Measurement method]
About each surface sheet of Example 1, Comparative Examples 1-2, and Reference Example 1, the contact area with skin was measured with the following method.
A cut sample having a size of 60 mm (CD direction) × 80 mm (MD direction) is cut out from each surface sheet. In an unpressurized state, a transparent acrylic plate having a weight of 50 g is placed on top of the cut sample, a 250 g weight is further placed on the acrylic plate, and a load of 6.25 gf / cm ² is applied. The surface shape of each cut sample was measured using a high-precision shape measurement system KS-1100 manufactured by Keyence, and an image was captured. Analyzing the captured image using Keyence's shape analysis application KS-Analyzer, extracting the portion that has changed in the thickness direction under a load of 6.25 gf / cm ² from the unloaded state, and binarized By processing, an image of a portion in contact with the skin at the time of wearing was obtained. This image was printed with a printer and loaded into a computer. To capture the image, the center of the cut sample is used, and two [Sunlight SL-230K2; manufactured by LPL Co., Ltd.] are used as light sources, and a CD camera (HV-37; Hitachi Electronics Co., Ltd.). The lens (Nikon Ai AF Nicol 24mmF2.8D) was connected by an F mount, and an image was captured and processed using Nexus NewQube (Ver. 4.22), and the contact area was measured. Thereafter, the “contact area ratio” was calculated by dividing the measured contact area by the area of the entire cut sample. The contact area ratio obtained by the measurement is defined as the contact area ratio with the skin.

(2) Surface liquid return [Measurement method]
Each surface sheet of Example 1, Comparative Examples 1 and 2 and Reference Example 1 was cut into a size of 60 mm (CD direction) × 80 mm (MD direction), and each was the same shape and size absorbent sheet (pulp 200 g / m ^2). Further, a measurement sample was prepared by adhering to a absorbent polymer (50 g / m ² ) via a hot melt adhesive. Next, place the measurement sample horizontally so that the surface sheet is on the surface side, and stack an acrylic plate with a cylinder with a 1 cm diameter injection port on the bottom, and remove fibrotic horse blood from the injection port (Nippon Biotest ( 9 g) was injected, and the state was maintained for 1 minute after the injection. Next, the acrylic plate with a cylinder was removed, and 16 sheets of absorbent paper (commercially available tissue paper) having a length of 6 cm × width of 9.5 cm and a basis weight of 13 g / m ² were placed on the surface of the surface sheet. Further, a weight was placed thereon so that the pressure was 4.0 × 10 ² Pa, and pressure was applied for 5 seconds. After pressurization, the absorbent paper was taken out, the weight of the paper before and after pressurization was measured, and the weight of defibrinated horse blood absorbed by the paper was measured to obtain the surface liquid return amount.

(3) Liquid flow [Measurement method]
Each surface sheet of Example 1, Comparative Examples 1 and 2 and Reference Example 1 was cut into a size of 150 mm (MD direction) × 50 mm (CD direction), and each was the same shape and size absorbent sheet (pulp 200 g / m ² Further, a measurement sample was prepared by adhering to a absorbent polymer (50 g / m ² ) via a hot melt adhesive. The test apparatus has a mounting portion in which the mounting surface of the measurement sample is inclined by 45 °. A measurement sample was placed on the placement portion so that the topsheet faced upward. Next, colored distilled water was dropped as a test solution onto the measurement sample at a rate of 1 g / 10 sec. Then, the distance from the point where the top sheet was first wetted to the point where the test liquid was first absorbed by the absorbent sheet was measured. The above operation was performed three times, and the average value of the three times was determined as the liquid flow distance (mm). The liquid flow distance is an index of how much the liquid propagates through the wearer's skin, and the shorter the liquid flow distance, the higher the evaluation. Evaluation was scored according to the following criteria.
A: The average value of the liquid flow distance is less than 15 mm B: The average value of the liquid flow distance is 15 mm or more and less than 50 mm C: The average value of the liquid flow distance is 50 mm or more and less than 100 mm Note that the average value of the liquid flow distance exceeds 100 mm For things, it is expressed as> 100.

(4) Coefficient of friction with skin [Measurement method]
About each surface sheet of Example 1, Comparative Examples 1-2, and Reference Example 1, the friction coefficient with skin was measured with the following method.
Each surface sheet of Example 1, Comparative Examples 1-2 and Reference Example 1 was cut into a size of 50 mm (MD direction) × 50 mm (CD direction), and a weight with a hook (weight 211 g, length 63 mm × width 63 mm × A paper double-sided tape was used for the thickness 7 mm), and adhesion was performed so that the surface opposite to the convex portion of the sample was the back surface. Place the sample on the acrylic plate so that the convex side of the sample with the weight attached is on the bottom, attach the wire to the hook, and attach it to the tensile tester Tensilon RTC-1210A manufactured by Orientec via a pulley. It was. The weight adhered to the sample was pulled at a pulling speed of 200 mm / min and slid horizontally on the acrylic plate. The average value of the load of the recorded chart was made into friction force, and the friction coefficient was computed from the weight of the sample which adhered the weight. The coefficient of friction obtained by the measurement is defined as the coefficient of friction with the skin.

(5) Touchability [Measurement method]
Each surface sheet of Example 1, Comparative Examples 1 and 2 and Reference Example 1 was placed on a horizontal table so that the surface on the convex side was up. The touch was evaluated by 10 expert panelists. The evaluation criteria were scored with 3 points when there was no roughness, 2 points when there was some roughness, and 1 point when there was roughness, and the average value was calculated. Evaluation was scored according to the following criteria.
A: Average value is 2.5 or more and 3 or less B: Average value is 2.0 or more and less than 2.5 C: Average value is 1.0 or more and less than 2.0

(6) Ratio of the area of the high convex part to the area of the low convex part [Measuring method]
Regarding the surface sheet of Example 1, the area surrounded by straight lines connecting the centroids of the four embossed portions forming the small polygonal region including the low convex portion was determined as the area of the low convex portion. Moreover, the area surrounded by the straight line connecting the centers of gravity of each of the six embossed portions forming the large polygonal region including the high convex portion was determined as the area of the high convex portion. Next, regarding the top sheet 100A of Comparative Example 1, as shown in FIG. 14, there are no two types of convex portions, that is, a high convex portion and a low convex portion, and there is only one type of convex portion 300. The area surrounded by the straight line connecting the centroids of the four embossed portions 200 forming the quadrangular region including the height was obtained as the area of the low convex portion and the area of the high convex portion. Next, regarding the topsheet 100B of Comparative Example 2, as shown in FIG. 15, the area surrounded by straight lines connecting the centroids of the four embossed portions 200 forming the quadrangular region including the small convex portions 330 is shown. The area of the low convex portion was obtained. Further, the area surrounded by the straight line connecting the centroids of the eight embossed portions 200 forming the octagonal region including the large convex portion 320 was determined as the area of the high convex portion. Next, as shown in FIG. 16, the top sheet 100 </ b> S of Reference Example 1 includes a high convex portion 320, a middle convex portion 310, and a low convex portion 330, and forms a quadrangular region including the low convex portion 330. An area surrounded by a straight line connecting the tip of the rod-shaped body 200a adjacent to the Y direction and the tip of the rod-shaped body 200b and a straight line connecting the tip of the rod-shaped body 200a adjacent to the X direction and the tip of the rod-shaped body 200b are It calculated | required as an area of a low convex part. Further, the area surrounded by the four Y-shaped embossed portions 200 forming the octagonal region including the high convex portion 320, specifically, the contour of the Y-shaped embossed portion 200, adjacent to the Y direction. The area surrounded by the straight line connecting the tips of the rod-shaped body 200c and the straight line connecting the tip of the rod-shaped body 200a adjacent to the X direction and the tip of the rod-shaped body 200b was determined as the area of the high convex portion.

According to the results in Table 1, the surface sheet of Example 1 has the lowest contact area ratio with the skin, and is about 1/3 lower than the surface sheet of Comparative Example 1. Therefore, when the surface sheet of Example 1 is used for an absorbent article, an effect of further reducing stickiness and stuffiness and reducing damage to the skin can be expected. Moreover, the surface sheet of Example 1 has the lowest coefficient of friction with the skin, and an effect of suppressing damage to the skin can be expected.
Moreover, the surface sheet of Example 1 has the lowest surface liquid returnability. Therefore, when the surface sheet of Example 1 is used for an absorbent article, for example, the surface liquid returnability is low, so that stickiness and stuffiness can be further reduced and damage to the skin can be reduced. In addition, since the surface sheet of Example 1 has good liquid flow properties, when the surface sheet of Example 1 is used for absorbent articles, body fluid easily moves from the surface to the lower side, and there is a risk of liquid leakage during wearing. It is expected to reduce skin damage caused by body fluid remaining on the surface.
Moreover, since the surface sheet of Example 1 has the lowest coefficient of friction with the skin and also has good touch properties, when the surface sheet of Example 1 is used for an absorbent article, the texture is soft and the feeling of use is improved. Can be expected.
Furthermore, compared with the surface sheet of Example 1, the surface sheet of Example 1 can reduce the ratio of the area of the high protrusions to the area of the low protrusions even though the embossing rate is lowered. Moreover, the contact area ratio with the skin can be reduced. Therefore, the texture is soft and it is easy to suppress liquid accumulation at the embossed portion.

1A, 1B, 1C Surface sheet 2 Embossed portion 21 Intermediate embossed portion 21a Two-direction extended shape portion 21e Protruding portion 22 Other embossed portion 22e Protruding portion BT Large polygonal region ST Small polygonal region 3 Convex portion 31 High convex portion 32 Low convex portion Part 10 Sanitary napkin (absorbent article)
DESCRIPTION OF SYMBOLS 11 Absorbent main body 12 Back surface sheet 13 Absorber 14 Side sheet 15 Wing part 16 Fixing part

Claims (8)

A surface sheet for an absorbent article having a heat-shrinkable fiber layer including heat-shrinkable heat-shrinkable fibers and having a plurality of embossed portions formed thereon,
A plurality of large polygonal regions surrounded by a plurality of the embossed portions, the embossed portions forming the tops of the large polygonal regions;
A plurality of small polygon regions having a smaller area than the large polygon region, surrounded by the embossed portions forming the tops of the plurality of large polygon regions, and the embossed portion also forms the top of the small polygon region. And
High convex portions are formed in each of the large polygon regions, and low convex portions having a height lower than that of the high convex portions are formed in each of the small polygon regions,
A plurality of large polygon regions are arranged adjacent to each other along the first direction, and a plurality of small polygon regions are arranged adjacent to each other along the first direction. Are arranged alternately in a second direction orthogonal to the first direction ,
A high convex portion row configured by arranging a plurality of the high convex portions along the first direction, and a low convex portion row configured by arranging a plurality of the low convex portions along the first direction. , Alternately arranged in a second direction orthogonal to the first direction,
The embossed portion is an intermediate embossed portion between the two high convex portions located closest to each other in the second direction and between the two low convex portions located closest to each other in the first direction. Have
The two large polygonal regions that are closest to each other in the second direction share one apex;
The intermediate embossed portion extends from the center point of the top portion along a side forming the outer shape of one of the large polygonal regions, and forms the outer shape of the other large polygonal region from the central point of the top portion. A top sheet for absorbent articles, which is formed in a four-direction extending shape extending along the side . 2. The absorbent article according to claim 1 , wherein all of the embossed portions constituting the small polygon region are shared with the embossed portions constituting the plurality of large polygon regions adjacent to the small polygon region. Surface sheet. The top sheet for absorbent articles according to claim 1 or 2 , wherein the large polygonal region is formed in a hexagonal shape and the small polygonal region is formed in a quadrangular shape. The embossed portion excluding the intermediate embossed portion includes the small polygon region sharing one top and the two large polygon regions adjacent to each other in the first direction. The outer shape is formed and extends along the side forming the outer shape of one of the large polygonal regions, and the outer shape of the small polygonal region is formed from the center point of the top and the other large number Three directions extending along the side forming the outer shape of the rectangular region and extending along the side forming the outer shape of one of the large polygon regions and the outer shape of the other large polygon region The surface sheet for absorbent articles according to any one of claims 1 to 3, wherein the surface sheet is formed in an extended shape. A non-heat-shrinkable fiber layer made of non-heat-shrinkable fibers laminated on the heat-shrinkable fiber layer, and the heat-shrinkable fiber layer and the non-heat-shrinkable fiber layer are joined intermittently by the plurality of embossed portions. The surface sheet for absorbent articles according to any one of claims 1 to 4 . The top sheet for absorbent articles according to claim 5 , wherein the non-heat-shrinkable fiber layer is disposed on the skin contact surface side, and the heat-shrinkable fiber layer is disposed on the non-skin contact surface side. An absorbent article provided with the surface sheet for absorbent articles of any one of Claims 1-6 . The absorbent article has a longitudinal direction corresponding to the longitudinal direction of the wearer and a lateral direction perpendicular thereto, and the large polygon region row and the small polygon region row are arranged along the lateral direction. The absorbent article according to claim 7 .

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