JP2011015707A - Surface sheet for absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface sheet for absorbent articles which reduces damage to a skin by further reducing the area in contact with the skin of a wearer, by further imparting density gradients of fibers, and by further reducing sticky feeling and stuffiness.SOLUTION: The surface sheet 1A of the absorbent articles is configured by joining a lower layer 3 including a heat-shrinkable fiber and an upper layer 2 provided on the lower layer 3 by a plurality of thermal adhesion embosses 4 provided regularly and by thermally shrinking the heat-shrinkable fiber. The surface sheet 1A has a plurality of large protruding parts 6a and small protruding parts 6b which are surrounded by a plurality of the thermal adhesion embosses 4 and have a three-dimensional dome structure of two kinds in sizes on the surface on the side of the upper layer 2. The large protruding parts 6a and the small protruding parts 6b are formed into a polygonal shape surrounded by the plurality of thermal adhesion embosses 4. A bottom area of the large protruding part 6a of the surface sheet 1A is twice or more that of the small protruding part 6b. The height at a vertex 61 of the large protruding part 6a in the surface sheet 1A is greater than the height at a vertex 62 of the small protruding part 6b.

Description

  The present invention relates to a surface sheet used for absorbent articles such as sanitary napkins and disposable diapers.

  Conventionally, as a surface sheet for an absorbent article such as a sanitary napkin or a disposable diaper, an embossed surface is formed on a surface that comes into contact with the wearer's skin to form irregularities. According to the surface sheet having unevenness, the contact area with the skin of the wearer is reduced due to the presence of the unevenness, so that it is possible to reduce stickiness and stuffiness. Moreover, the density gradient of the fiber which comprises a surface sheet is formed between the embossed part formed by embossing, and a non-embossed part. In the embossed portion having a high fiber density, the capillary force works more strongly than in the non-embossed portion having a low fiber density, and thus excreted body fluid easily moves from the non-embossed portion toward the embossed portion. As a result, the liquid can be smoothly transferred in the thickness direction of the top sheet.

  As a surface sheet as described above, for example, in Patent Document 1, as shown in FIG. 9A, a large number of dot-like embosses 400 are provided in a regular pattern, and the concave portions 500 and the convex portions 600 are regularly formed. A topsheet 100 for absorbent articles is disclosed. Moreover, in patent document 2, as shown to Fig.10 (a), many cross-shaped embossing 401 is provided with a regular pattern, and it is for absorbent articles which distribute | arranged the recessed part 501 and the convex part 601 regularly. The surface sheet 101 is disclosed.

  However, as shown in FIGS. 9 (a) and 10 (a), a large number of convex portions 600 and 601 described in Patent Document 1 and Patent Document 2 have one type of regular pattern by embossing 400 and 401. It is formed into a shape. As shown in FIG. 9B and FIG. 10B, the heights of a large number of convex portions 600 and 601 having one shape described in Patent Document 1 and Patent Document 2 are substantially the same. It is difficult to reduce the contact area with the wearer's skin.

JP 2008-136563 A JP 2009-512 A

  Therefore, the problem of the present invention is to further reduce the contact area with the wearer's skin and further impart a fiber density gradient, further reduce stickiness and stuffiness, and reduce the damage to the skin. The object is to provide a surface sheet of an article.

  According to the present invention, the lower layer including the heat-shrinkable fibers disposed on the non-skin contact surface side and the upper layer disposed on the skin contact surface side are intermittently provided by a large number of regularly arranged thermal bonding embosses. A surface sheet for an absorbent article which is bonded and the heat-shrinkable fibers of the lower layer are heat-shrinked, and has a large bulge and a small three-dimensional dome structure surrounded by the heat-bonding emboss. Each has a large number of convex portions on the skin contact surface side of the upper layer, each of the large convex portion and the small convex portion is formed in a polygonal shape surrounded by a plurality of adjacent thermal bonding embosses, The large convex portion and the small convex portion are formed adjacent to each other, the bottom area of the large convex portion is at least twice the bottom area of the small convex portion, and the height at the top of the large convex portion is high. Is provided with a top sheet for absorbent articles that is higher than the height at the apex of the small convex portion. It is.

  According to the surface sheet for absorbent articles of the present invention, the contact area with the wearer's skin is further reduced, and a density gradient of fibers is further imparted, stickiness and stuffiness are further reduced, and damage to the skin is reduced. Can be reduced.

FIG. 1 is a perspective view showing a top sheet for absorbent articles according to the first embodiment of the present invention. FIG. 2 is an enlarged plan view showing the shape and arrangement pattern of heat-bonding embossing in the top sheet for absorbent articles shown in FIG. 3 is a cross-sectional view taken along the line X1-X1 shown in FIG. 4 is a cross-sectional view taken along line X2-X2 shown in FIG. FIG. 5 is a cross-sectional view showing a usage state of the top sheet for absorbent articles according to the first embodiment. FIG. 6: is an enlarged plan view which shows the shape and arrangement | positioning pattern of the thermobonding embossing in the surface sheet for absorbent articles which is 2nd Embodiment of this invention. FIG. 7: is an enlarged plan view which shows the shape and arrangement | positioning pattern of the thermobonding embossing in the surface sheet for absorbent articles which is 3rd Embodiment of this invention. FIG. 8 is an enlarged plan view showing the shape and arrangement pattern of the heat-bonding embossing in the top sheet for absorbent articles that is an example of the present invention. Fig.9 (a) is an enlarged plan view which shows the shape and arrangement | positioning pattern of the thermobonding embossing in the surface sheet for conventional absorbent articles, FIG.9 (b) is X10-X10 shown to Fig.9 (a). It is sectional drawing. Fig.10 (a) is an enlarged plan view which shows the shape and arrangement | positioning pattern of the thermobonding embossing in the surface sheet for conventional absorbent articles, FIG.10 (b) is X11-X11 shown to Fig.10 (a). It is sectional drawing.

  Hereinafter, a preferred first embodiment of a top sheet for absorbent articles of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the top sheet for absorbent articles according to the first embodiment (hereinafter also referred to as “top sheet 1 </ b> A”) is non-skinned by a large number of regular thermal bonding embosses 4. The lower layer 3 including the heat-shrinkable fibers disposed on the contact surface side and the upper layer 2 disposed on the skin contact surface side (arranged on the lower layer 3) are intermittently bonded to each other, and the heat shrinkability of the lower layer 3 The fibers are formed by heat shrinking.
The surface sheet 1A will be described in detail. The surface sheet 1A has an upper layer 2 and a lower layer 3 containing heat-shrinkable fibers as shown in FIG. The upper layer 2 and the lower layer 3 are laminated together. Further, the upper layer 2 and the lower layer 3 are partially joined and bonded together by a large number of thermal bonding embosses 4. As shown in FIG. 1, the top sheet 1 </ b> A has a large number of recesses 5 that are recessed by thermal bonding emboss 4 on the surface on the upper layer 2 side, and a non-embossed portion that is not thermally bonded embossed 4, that is, between the recesses 5. A large number of convex portions 6 are formed.

  A large number of thermal bonding embosses 4 are regularly arranged as shown in FIGS. 1 and 2, and the large convex portions 6 a of a three-dimensional dome structure of two types surrounded by the plurality of thermal bonding embosses 4. A large number of small convex portions 6b are formed on the surface of the upper layer 2 on the skin contact surface side. As shown in FIG. 1, the large convex portion 6a of the three-dimensional dome structure is a larger convex portion among the two types of convex portions 6 formed by being surrounded by the thermal bonding emboss 4, and the small convex portion 6b is Among the two types of convex portions 6, the smaller convex portion. The large convex portion 6a and the small convex portion 6b are formed in a polygonal shape surrounded by a plurality of heat bonding embosses 4, and the large convex portion 6a and the small convex portion 6b are adjacent to each other as shown in FIG. Is formed.

  As shown in FIG. 2, the shape of the heat bonding emboss 4 in the top sheet 1 </ b> A is formed in a Y shape in plan view. As shown in FIG. 2, each of the large number of thermal bonding embosses 4 extends on a straight line connecting the centers of gravity of two adjacent thermal bonding embosses 4 and 4 located at the shortest distance. The center of gravity in the present invention refers to the center of mass of the figure when the shape when the emboss is viewed in plan is a uniform plane figure. Specifically, it extends from the center of gravity of one thermal bonding emboss 4 toward the center of gravity of three thermal bonding embosses 4 adjacent to the thermal bonding emboss 4 and is formed in a Y shape. The Y-shaped thermal bonding emboss 4 formed in this way is symmetric with respect to a straight vertical bisector connecting the center of gravity of the thermal bonding emboss 4 and the center of gravity of the adjacent thermal bonding embossed portion 4 as an axis of symmetry. Is formed.

From the viewpoint of enhancing the liquid diffusibility in the top sheet 1A and maintaining a good touch, the heat-bonded emboss 4 is preferably provided in an amount of 1 to 32 pieces / cm ² and 2 to 16 pieces / cm ^2. More preferably. Moreover, it is preferable that the space | interval of two adjacent thermal-bonding embosses 4 and 4 in the shortest distance is 0.5-5.0 mm from a viewpoint of strengthening the density gradient of the constituent fiber in 1 A of surface sheets. More preferably, it is 0.0-3.0 mm. Also, the one area of the heat bonding embossing 4 is preferably 1.0 to 10 mm ^2, further preferably 1.7~5.0mm ^2.

  As shown in FIG. 1 and FIG. 2, a large number of large convex portions 6 a in the top sheet 1 </ b> A are surrounded by eight adjacent thermal bonding embosses 4 that are located at the shortest distance when the top sheet 1 </ b> A is viewed in plan view. It is formed in an octagonal shape. As shown in FIGS. 1 and 2, the large number of small convex portions 6b in the surface sheet 1A are formed adjacent to the large convex portions 6a in plan view of the surface sheet 1A. It is formed in a quadrangular shape surrounded by the convex portions 6a, that is, surrounded by four thermal bonding embosses constituting a part of the four large convex portions 6a. As described above, the large number of convex portions 6 of the top sheet 1A of the first embodiment are a large number of octagonal large convex portions 6a and a large number of quadrangular small convex portions in plan view of the topsheet 1A. 6b. The number of corners (octagonal shape) of the large convex portions 6a of the top sheet 1A of the first embodiment has a relationship that is twice the number of corners (tetragonal shape) of the small convex portions 6b.

  The bottom area of the large convex portion 6a is more than twice the bottom area of the small convex portion 6b. From the viewpoint of reducing the contact area, the bottom areas of the large large convex portions 6a in the surface sheet 1A are each a large number of small areas. It is preferable that it is four times or more of each bottom area of the convex part 6b. Here, the bottom area of the large convex portion 6a means the area of a region surrounded by a straight line connecting the centers of gravity of the eight thermal bonding embosses 4 surrounding the large convex portion 6a. Similarly, the bottom area of the small convex portion 6b means the area of a region surrounded by a straight line connecting the centers of gravity of the four thermal bonding embosses 4 surrounding the small convex portion 6a.

  As shown in FIG. 3, the height ha at the apex 61 of the large convex portion 6a is formed to be higher than the height hb at the apex 62 of the small convex portion 6b. Specifically, in the topsheet 1A, as shown in FIG. 2, the large convex portion 6a is surrounded by eight adjacent thermal bonding embosses 4a, 4b, 4c, 4d, 4e, 4f, 4g, and 4h. The apex 61 of the large convex portion 6a is located at the center of gravity of the region, and the height ha is the height at the center of gravity. As shown in FIG. 2, the small convex portion 6b is a region surrounded by four large convex portions 6a, and the apex 62 of the small convex portion 6b is located at the center of gravity of the region, and the height hb is , The height at its center of gravity. The surface sheet 1A is formed by partially bonding the upper layer 2 and the lower layer 3 by laminating and thermally bonding embossing 4 from the upper layer 2 side, as described in the manufacturing method of the surface sheet 1A described later. Moreover, by carrying out the thermobonding embossing 4, large convex portions 6 a and small convex portions 6 b that are convex on the upper layer 2 side are formed on the top sheet 1 </ b> A. Therefore, the distance between the center of gravity of the octagonal large convex portion 6a and the thermal bonding emboss 4 (for example, the thermal bonding emboss 4a) forming the large convex portion 6a is as shown in FIG. The larger convex portion 6a is wider than the distance between the center of gravity of the portion 6b and the thermal bonding emboss 4 (for example, the thermal bonding emboss 4c) that forms the small convex portion 6b, as described in the manufacturing method of the surface sheet 1A described later. However, the upper layer 2 tends to protrude in a convex shape due to heat shrinkage of the heat-shrinkable fibers constituting the lower layer 3. Therefore, in the surface sheet 1A of the first embodiment, as shown in FIG. 3, the height ha of the large convex portion 6a is formed higher than the height hb of the small convex portion 6b. The fiber density at the center of gravity (vertex 62) of the portion 6b is formed higher than the fiber density at the center of gravity (vertex 61) of the large convex portion 6a.

  Moreover, in the surface sheet 1A of 1st Embodiment, as shown in FIG. 3, the height hb of the square-shaped small convex part 6b is the straight line which connects the adjacent heat bonding embossing 4a and the heat bonding embossing 4b. It is formed higher than the height hc at the intermediate position c. Conversely, the fiber density at the intermediate position c between the thermal bonding emboss 4a and the thermal bonding emboss 4b is at the center of gravity (vertex 62) of the small convex portion 6b. It is formed higher than the fiber density. In addition, the height hc and the fiber density at the intermediate position c of the straight line connecting the adjacent heat bonding emboss 4a and the heat bonding emboss 4b are as follows: between the heat bonding emboss 4b, 4c, between the heat bonding emboss 4c, 4d, and the heat bonding emboss 4d. , 4e, between the heat-bonded embosses 4e, 4f, between the heat-bonded embosses 4f, 4g, between the heat-bonded embosses 4g, 4h, and between the heat-bonded embosses 4h, 4a, and the fiber density are the same.

  As shown in FIG. 4, in the thermal bonding emboss 4, the constituent fibers of the surface sheet 1 </ b> A are consolidated, and the height (thickness) of the surface sheet 1 is the highest as compared with the portion not subjected to the thermal bonding emboss 4. It is low (thin). That is, the fiber density of the concave portion 5 by the heat bonding emboss 4 is higher than that of the portion that is not heat bonded, and is the highest in the top sheet 1A. Depending on the embossing conditions, the fibers may be melted and solidified to form a film.

The height ha of the large convex portion 6a is preferably 1.0 mm to 7.0 mm, and more preferably 2.0 mm to 5.0 mm. The height hb of the small convex portion 6b is preferably 0.5 mm to 5.0 mm, and more preferably 0.5 mm to 3.0 mm. The height hc at the intermediate position c between the thermal bonding embosses 4a and 4b is preferably 0.2 mm to 4.0 mm, and more preferably 0.2 mm to 2.5 mm. The heights ha, hb, and hc are measured in the same manner as the method (1) for measuring the ratio of the fiber density of the topsheet 1A described below.
The ratio (db / da) of the fiber density db of the center of gravity (vertex 62) of the small convex part 6b to the fiber density da of the center of gravity (vertex 61) of the large convex part 6a is preferably 1.2 times or more, More preferably, it is 1.5 times or more. The ratio (dc / db) of the fiber density dc at the intermediate position c between the thermal bonding embosses 4a and 4b to the fiber density db of the center of gravity (vertex 62) of the small convex portion 6b is preferably 1.1 times or more. More preferably, it is 1.3 times or more.

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 the surface sheet was taken out from 10 or more absorbent articles and each basis weight was measured, the triple value (3σ) of the standard deviation σ was within 10% of the average μ, and fiber unevenness was seen in appearance. If not, it is determined 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.
The surface sheet 1A in plan view is cut along a straight line passing through the center of gravity (vertex 61) of the region surrounded by the eight thermal bonding embosses 4 and the two thermal bonding embosses 4, and a sample for measuring the large convex portion 6a is obtained. create. Further, the top sheet 1A in plan view is cut along a straight line passing through the center of gravity (vertex 62) of the region surrounded by the four thermal bonding embosses 4 and the two thermal bonding embosses 4, and used for measuring the small convex portion 6b. Create a sample. Further, the top sheet 1A in a plan view is cut by a straight line passing through two heat bonding embosses 4 adjacent to each other at the shortest distance, for example, the heat bonding emboss 4a and the heat bonding emboss 4b, and between the heat bonding embosses 4a and 4b. A sample for measuring the intermediate position c is created. At this time, attention should be paid so that the height of each measurement sample is not reduced as much as possible by cutting.

The cross section of the obtained sample is measured using a JEOL electron microscope JCM-5100 under the conditions of a sputtering time of 30 seconds (Pt) and an acceleration voltage of 10 KV, but at least one of the thermal bonding embossed portions 4 at both ends of the sample. Or a combination of a plurality of images, the thermal bonding embossed portion 4 can be seen, and the height (thickness) of each measurement sample is measured from the captured images. The image measurement may be performed using either a printed matter or a PC screen.
In the method (1), the height (thickness) of the central portion of the sample for measuring the small convex portion 6b is divided by the height (thickness) of the central portion of the sample for measuring the large convex portion 6a (ratio of density ( db / da). Further, the ratio of density by dividing the height (thickness) of the central portion of the sample for measuring the intermediate position c between the thermal bonding embosses 4a and 4b by the height (thickness) of the central portion of the sample for measuring the small convex portion 6b. (Dc / db).

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 (2), the distance between the nearest centroids at the center of the sample for measuring the small convex portion 6b is divided by the distance between the nearest centroids at the center of the sample for measuring the large convex portion 6a. db / da). Further, the density ratio is obtained by dividing the distance between the nearest centroids of the center portion of the sample for measuring the intermediate position c between the thermal bonding embosses 4a and 4b by the distance between the nearest centroids of the center portion of the sample for measuring the small convex portion 6b (Dc / db).

The material for forming the top sheet 1A for the absorbent article according to the first embodiment of the present invention described above will be described.
As the upper layer 2, 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 which fibers are in an extremely loose entanglement state after being subjected to a post-treatment applied to a card web used for manufacturing a nonwoven fabric, for example, a heat-sealing treatment by an air-through method or a calendar method. It is the body. When the web formed by the card method is used as the upper layer 2, the fibers in the upper layer 2 are heat-sealed simultaneously with or after the upper layer 2 and the lower layer 3 are bonded.
It is preferable that the constituent fibers of the upper layer 2 have substantially no heat shrinkability or are fibers having a heat shrinkage temperature higher than that of the constituent fibers of the lower layer 3.
The basis weight of the upper layer 2, the soft aspects and topsheet 1 to form a sufficient density gradient from the viewpoint of good, preferably 10 to 50 g / m ^2, more preferably a 15 to 40 g / m ^2.

As the lower layer 3, a web formed by a card method or a nonwoven fabric having heat shrinkability can be used.
As the constituent fiber of the lower layer 3, one made of a thermoplastic polymer material and having heat shrinkability is preferably used. Examples of such fibers include latently crimpable fibers. The content ratio of the latent crimpable fiber in the lower layer 3 is preferably 40 to 100% by weight. 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 latent crimpable 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 lower layer 3 can include such latent crimpable fibers, for example, and simultaneously with or after heat fusion with the upper layer 2, the crimps of the fibers can be expressed by heating to be contracted.
The basis weight of the lower layer 3 is preferably 10 to 50 g / m ² , more preferably 15 to 40 g / m ² .

  The topsheet 1A of the present invention includes, for example, an upper layer 2 made of a fiber having a higher heat shrinkage temperature than a non-heat-shrinkable fiber material or a lower layer fiber, and heat shrinkability before shrinkage having a heat shrinkage temperature lower than that of the upper layer fiber. The lower layer 3 made of a fiber material is partially bonded in a predetermined pattern with a large number of thermal bonding embosses 4 or at the same time after both are bonded together, heat is applied to cause the lower layer 3 to thermally shrink in the horizontal direction. It is formed by. The upper layer 2 is not easily heat-shrinked by the heat bonding emboss 4, but the upper layer 2 and the lower layer 3 are intermittently bonded and integrated by the heat bonding embossing 4. Will cause distortion. This strain rises in a convex shape on the upper layer 2 side to form a solid dome-shaped convex portion 6. The bonding (thermal fusion) by the heat bonding emboss 4 is, for example, an embossed surface (an embossing roll of an embossing roll) in which a large number of Y-shaped emboss pins corresponding to the heat bonding embossing 4 of the topsheet 1A are arranged in a predetermined pattern. The peripheral surface or the like) is pressed from the upper layer 2 side in the laminate of the upper layer 2 and the lower layer 3, and the upper layer 2 and the lower layer 3 in the portion heat-pressed by each embossed spin are melted. The convex portion 6 formed on the upper layer 2 may have a portion protruding so as to cover the concave portion 5 by the thermal bonding emboss 4.

  The heat shrinkage of the lower layer 3 is, for example, configured by forming the lower layer 3 from one or more kinds of heat-shrinkable fibers or including one or more kinds of heat-shrinkable fibers in the lower layer 3. At the same time as the lower layer 3 is bonded or after the upper layer 2 and the lower layer 3 are bonded, the lower layer 3 is heated. Thus, by thermally contracting the lower layer 3 in the horizontal direction, the bulge formation of the convex portion 6 of the three-dimensional dome structure formed in the upper layer 2 is enhanced, and the surface sheet 1A that is more bulky and feels better can be obtained. it can.

The surface sheet 1A formed by bonding the upper layer 2 and the lower layer 3 by the method described above preferably has a basis weight of 20 to 100 g / m ² , and more preferably 35 to 80 g / m ² .
Since the surface sheet 1A is formed with a large number of concave portions 5 and a large number of convex portions 6 (a large number of large convex portions 6a and a large number of small convex portions 6b) over the entire area of the upper layer 2, the sheet 1A has a thickness. And it becomes bulky.

The effect at the time of using the surface sheet 1A for absorbent articles of 1st Embodiment of this invention mentioned above as a surface material of a sanitary napkin is demonstrated.
As shown in FIG. 1, the top sheet 1 </ b> A of the first embodiment has a large number of large convex portions 6 a and small convex portions 6 b having two types of three-dimensional dome structures on the surface on the upper layer 2 side. Moreover, as shown in FIG. 1, the large convex part 6a and the small convex part 6b are formed adjacent to each other. Accordingly, when the upper layer 2 side of the topsheet 1A is used as the skin contact surface, as shown in FIG. 5, the large convex portion 6a contacts the skin, but the small convex portion arranged between the large convex portions 6a. The part 6b is difficult to contact the skin. Therefore, 1 A of surface sheets of 1st Embodiment can further reduce a contact area with a wearer's skin, and can further reduce a sticky feeling. Moreover, 1 A of surface sheets of 1st Embodiment can further reduce a contact area with a wearer's skin, the surface sheet 1A and skin become difficult to rub, and can reduce the damage to skin.

  Further, as described above, the fiber density of the top sheet 1A of the first embodiment is gradually increased from the center of gravity (vertex 61) of the large convex portion 6a toward the center of gravity (vertex 62) of the small convex portion 6b. In addition, from the center of gravity (vertex 62) of the small convex portion 6b, an intermediate position c between the thermal bonding embosses 4a and 4b (between the thermal bonding embosses 4b and 4c, between the thermal bonding embosses 4c and 4d, between the thermal bonding embosses 4d and 4e, thermal bonding The intermediate positions between the embosses 4e and 4f, between the heat-bonded embosses 4f and 4g, between the heat-bonded embosses 4g and 4h, and between the heat-bonded embosses 4h and 4a are also gradually increased. Intermediate position c between 4a and 4b (between thermal bonding embosses 4b and 4c, between thermal bonding embosses 4c and 4d, between thermal bonding embosses 4d and 4e, between thermal bonding embosses 4e and 4f, between thermal bonding embosses 4f and 4g, heat Wear embossed 4g, between 4h, thermal bonding embossing 4h, also respective intermediate positions between 4a is gradually increased formed toward the plurality of depressions 5 by thermal bonding embossing 4 from the same). In this way, since a degrading gradient is formed which gradually increases from the center of gravity (vertex 61) of the large convex portion 6a that first contacts the skin of the wearer toward the concave portion 5, the excreted body fluid is increased from the low density portion to the high density portion. The density portion is drawn by the capillary force and easily moves quickly, and the stuffiness can be further reduced. Moreover, since the density gradient is formed stepwise from the center of gravity (vertex 61) of the large convex portion 6a that first comes into contact with the skin of the wearer toward the concave portion 5, the cushion feeling (wearing feeling) is improved.

  Further, as shown in FIG. 1, the top sheet 1A of the first embodiment has regularly arranged octagonal large convex portions 6a and a quadrangular shape by regularly arranged thermal bonding embosses 4. The small convex portion 6b is formed. Since the small convex portions 6b arranged between the large convex portions 6a are not easily in contact with the skin and the small convex portions 6b are regularly arranged, the path connecting the adjacent small convex portions 6b easily allows air to pass therethrough. , Dripping can be further reduced.

  Further, the shape of the thermal bonding emboss 4 of the top sheet 1A of the first embodiment is formed in a Y shape in plan view as shown in FIG. 2, and the Y-shaped thermal bonding emboss 4 is It is formed symmetrically with a straight vertical bisector connecting the center of gravity of the thermobonding emboss 4 and the center of gravity of the adjacent thermobonding embossed part 4 as the axis of symmetry. The convex portions 6a and 6b formed by being surrounded by the Y-shaped thermal bonding emboss 4 are harder at the portion facing the Y-shaped thermal bonding emboss 4 than the other portions of the convex portions 6a and 6b. Therefore, the shape retainability of the convex portions 6a and 6b of the three-dimensional dome structure formed by the Y-shaped thermal bonding emboss 4 is improved, and a cushion feeling can be imparted to the top sheet 1A, thereby improving the wearing feeling.

Next, a top sheet for absorbent articles according to a second embodiment of the present invention (hereinafter, also referred to as “top sheet 1B”) 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. The points that are not particularly described are the same as those of the top sheet 1A of the first embodiment, and the description of the top sheet 1A of the first embodiment is appropriately applied.

  As shown in FIG. 6, the shape of the thermal bonding emboss 4 in the top sheet 1 </ b> B of the second embodiment is formed in an X shape in plan view. As shown in FIG. 6, each of the large number of thermal bonding embosses 4 extends on a straight line connecting the centers of gravity of two adjacent thermal bonding embosses 4 and 4 located at the shortest distance. Specifically, it extends from the center of gravity of one thermal bonding emboss 4 toward the center of gravity of four adjacent thermal bonding embosses 4 located at the shortest distance of the thermal bonding emboss 4 and is formed in an X shape. Has been. The X-shaped thermal bonding emboss 4 formed in this way is symmetrical with a straight vertical bisector connecting the center of gravity of the thermal bonding emboss 4 and the center of gravity of the adjacent thermal bonding embossed portion 4 as the axis of symmetry. Is formed.

  As shown in FIG. 6, each of the large convex portions 6 a in the top sheet 1 </ b> B is a hexagon surrounded by six adjacent thermal bonding embosses 4 located at the shortest distance when the top sheet 1 </ b> B is viewed in plan. It is formed into a shape. As shown in FIG. 6, the large number of small convex portions 6b in the top sheet 1B are formed adjacent to the large convex portions 6a in plan view of the top sheet 1B. It is formed in a triangular shape surrounded by the portions 6a, that is, surrounded by three thermal bonding embosses constituting a part of the three large convex portions 6a. As described above, the large number of convex portions 6 of the top sheet 1B of the first embodiment are a large number of hexagonal large convex portions 6a and a large number of triangular small convex portions in plan view of the topsheet 1B. 6b. The number of corners (hexagonal shape) of the large convex portions 6a of the top sheet 1B of the first embodiment has a relationship that is twice the number of corners (triangular shape) of the small convex portions 6b.

  The height ha at the apex 61 of the large convex portion 6a is formed to be higher than the height hb at the apex 62 of the small convex portion 6b. More specifically, in the topsheet 1B, the large convex portion 6a is an area surrounded by six adjacent thermal bonding embosses 4a, 4b, 4c, 4d, 4e, 4f as shown in FIG. Yes, the height ha is the height at the apex 61 of the region. As shown in FIG. 6, the small convex portion 6 b is a region surrounded by the three large convex portions 6 a, and the height hb is the height at the apex 62 of the region. By carrying out the thermal bonding embossing 4, large convex portions 6 a and small convex portions 6 b that are convex on the upper layer 2 side are formed on the top sheet 1 </ b> B. Therefore, the interval between the apex 61 of the hexagonal large convex portion 6a and the thermal bonding emboss 4 (for example, the thermal bonding emboss 4a) forming the large convex portion 6a is small as shown in FIG. As described in the manufacturing method of the topsheet 1A described above, the large convex portion is wider than the distance between the apex 62 of the convex portion 6b and the thermal bonding emboss 4 (for example, the thermal bonding emboss 4b) forming the small convex portion 6b. In the case of 6a, the upper layer 2 is likely to protrude in a convex shape due to the heat shrinkage of the heat-shrinkable fibers constituting the lower layer 3. Therefore, in the surface sheet 1B of the second embodiment, as shown in FIG. 6, the height ha of the large convex portion 6a is formed higher than the height hb of the small convex portion 6b. The fiber density at the center of gravity (vertex 62) of the portion 6b is formed higher than the fiber density at the center of gravity (vertex 61) of the large convex portion 6a.

  Moreover, in the surface sheet 1B of 2nd Embodiment, as shown in FIG. 6, the height hb of the triangle-shaped small convex part 6b is a straight line which connects the adjacent heat bonding embossing 4a and the heat bonding embossing 4b. It is formed higher than the height hc at the intermediate position c. Conversely, the fiber density at the intermediate position c between the thermal bonding emboss 4a and the thermal bonding emboss 4b is at the center of gravity (vertex 62) of the small convex portion 6b. It is formed higher than the fiber density. In addition, the height hc and the fiber density at the intermediate position c of the straight line connecting the adjacent heat bonding emboss 4a and the heat bonding emboss 4b are as follows: between the heat bonding emboss 4b, 4c, between the heat bonding emboss 4c, 4d, and the heat bonding emboss 4d. 4e, between the heat-bonded embosses 4e and 4f, and between the heat-bonded embosses 4f and 4a, the height and fiber density are the same.

The effect at the time of using the surface sheet 1B for absorbent articles of 2nd Embodiment of this invention mentioned above is demonstrated.
The top sheet 1B of the second embodiment can obtain the same effects as the top sheet 1A of the first embodiment. Hereinafter, effects different from those of the top sheet 1A of the first embodiment will be described.

  In the topsheet 1B of the second embodiment, since the small convex portions 6b are formed in a triangle, the height hb of the small convex portions 6b can be further lowered than the topsheet 1A, and the small convex portions 6b. Since the triangle forming the shape always shares the heat bonding emboss with the triangle forming the other small convex portion 6b, the space formed between the small convex portion 6b and the skin is substantially continuous in the surface direction of the topsheet 1B. It is formed and can exhibit excellent air permeability.

Next, a top sheet for absorbent articles according to a third embodiment of the present invention (hereinafter also referred to as “top sheet 1C”) 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. The points that are not particularly described are the same as those of the top sheet 1A of the first embodiment, and the description of the top sheet 1A of the first embodiment is appropriately applied.

As shown in FIG. 7, the shape of the thermal bonding emboss 4 in the top sheet 1 </ b> C of the third embodiment is formed in a circular shape in plan view.
As shown in FIG. 7, each of the large convex portions 6a in the top sheet 1C has four corners surrounded by eight adjacent thermal bonding embosses 4 located at the shortest distance when the top sheet 1C is viewed in plan. It is formed into a shape. As shown in FIG. 7, the large number of small convex portions 6b in the top sheet 1C are formed adjacent to the large convex portions 6a in plan view of the top sheet 1C. It is formed in a quadrangular shape surrounded by four thermal bonding embosses constituting a part. As shown in FIG. 7, nine quadrangular small convex portions 6b are arranged between four regularly arranged large convex portions 6a. The quadrangular small convex portions 6b form an X shape in plan view. As described above, the large number of convex portions 6 of the topsheet 1C of the third embodiment are a large number of quadrangular large convex portions 6a and a large number of quadrangular small convex portions in plan view of the topsheet 1C. 6b.

  The height ha at the apex 61 of the large convex portion 6a is formed to be higher than the height hb at the apex 62 of the small convex portion 6b. Specifically, in the topsheet 1C, the large convex portion 6a is surrounded by eight adjacent thermal bonding embosses 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h as shown in FIG. This is a region with four corners (thermal bonding embosses 4a, 4c, 4e, 4g), and the height ha is the height at the center of gravity (vertex 61) of the region. As shown in FIG. 7, the small convex portion 6b is a region surrounded by four thermal bonding embosses constituting a part of the adjacent large convex portion 6a, and the height hb is the center of gravity (vertex) of the region. 62). By carrying out the thermal bonding embossing 4, large convex portions 6 a and small convex portions 6 b that are convex on the upper layer 2 side are formed on the top sheet 1 </ b> B. Accordingly, as shown in FIG. 7, the distance between the center of gravity of the quadrangular large convex portion 6a and the thermal bonding emboss 4 (for example, the thermal bonding emboss 4a) forming the large convex portion 6a is small. The distance between the center of gravity of the portion 6b and the thermal bonding emboss 4 (for example, the thermal bonding emboss 4c) that forms the small convex portion 6b is larger than the distance between the large convex portion 6a. On the other hand, the upper layer 2 tends to protrude in a convex shape due to the heat shrinkage of the heat-shrinkable fibers constituting the lower layer 3. Therefore, in the top sheet 1C of the third embodiment, as shown in FIG. 7, the height ha of the large convex portion 6a is formed higher than the height hb of the small convex portion 6b. The fiber density at the center of gravity (vertex 62) of the portion 6b is formed higher than the fiber density at the center of gravity (vertex 61) of the large convex portion 6a.

  Further, in the topsheet 1C of the third embodiment, the height hb of the quadrangular small convex portion 6b is a straight line connecting the adjacent thermal bonding emboss 4c and the thermal bonding emboss 4d as shown in FIG. It is formed higher than the height hc at the intermediate position c. Conversely, the fiber density at the intermediate position c between the thermal bonding emboss 4c and the thermal bonding emboss 4d is at the center of gravity (vertex 62) of the small convex portion 6b. It is formed higher than the fiber density. The height hc and the fiber density at the intermediate position c of the straight line connecting the adjacent heat-bonded emboss 4c and the heat-bonded emboss 4d are the same between the heat-bonded embosses 4a and 4b, between the heat-bonded embosses 4b and 4c, and the heat-bonded emboss 4d. , 4e, between the heat-bonded embosses 4e, 4f, between the heat-bonded embosses 4f, 4g, between the heat-bonded embosses 4g, 4h, and between the heat-bonded embosses 4h, 4a, and the fiber density are the same.

The effect at the time of using the surface sheet 1C for absorbent articles of 3rd Embodiment of this invention mentioned above is demonstrated.
The top sheet 1C of the third embodiment can obtain the same effects as the top sheet 1A of the first embodiment. Hereinafter, effects different from those of the top sheet 1A of the first embodiment will be described.

  The topsheet 1C according to the third embodiment includes the quadrangular small convex portions 6b, and the quadrangular small convex portions 6b are regularly arranged as shown in FIG. Nine pieces are continuously arranged between the large convex portions 6a having a square shape, and the nine small convex portions 6b having a quadrangular shape form an X shape in plan view. Since the small convex portions 6b arranged between the large convex portions 6a are not easily in contact with the skin and the small convex portions 6b are regularly arranged, the path connecting the adjacent small convex portions 6b easily allows air to pass therethrough. , Dripping can be further reduced.

  In the topsheet 1C of the third embodiment, since the small convex portions 6b are continuously arranged in a straight line, air can be more easily passed through and the stuffiness can be further reduced.

  The surface sheet for absorbent articles of the present invention is not limited to the surface sheet 1A of the first embodiment, the surface sheet 1B of the second embodiment, and the surface sheet 1C of the third embodiment, and is appropriately selected. It can be changed.

  For example, in the top sheet 1A of the first embodiment, the top sheet 1B of the second embodiment, and the top sheet 1C of the third embodiment, as shown in FIGS. Are Y-shaped, X-shaped, and circular, respectively, but other shapes such as an ellipse, a triangle, a rectangle, and combinations thereof may be used.

  In the top sheet 1A of the first embodiment, the top sheet 1B of the second embodiment, and the top sheet 1C of the third embodiment, as shown in FIGS. 2, 6, and 7, the two-layer structure is used. However, a single-layer structure may be used, and the upper layer 2 may be laminated on both surfaces of the lower layer 3 to form a three-layer structure.

The surface sheet of the present invention is used as a surface sheet for absorbent articles.
The absorbent article is mainly used for absorbing and holding excretory body fluids such as urine and menstrual blood. Absorbent articles include, for example, disposable diapers, sanitary napkins, incontinence pads, and the like, but are not limited to these, and widely include articles used to absorb liquid discharged from the human body.

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

[Manufacture of upper layer]
A card web having a basis weight of 22 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. Used as. The core-sheath type composite fiber has polyethylene terephthalate as a core component and polyethylene as a sheath component.

[Manufacture of lower layer]
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. as a lower layer. It was.

Example As shown in FIG. 8, the shape of the thermal bonding emboss 4 is circular, and emboss bonding is performed in the pattern shown in FIG. 8 from the upper layer side in which the upper layer is superimposed on the lower layer, and eight thermal bondings are performed. An octagonal large convex portion 6 a surrounded by the emboss 4 and a quadrangular small convex portion 6 b surrounded by the four heat bonding embosses 4 were formed. After embossing the laminate, hot air of 130 ° C. ± 10 ° C. is passed through for 5 to 10 seconds to crimp the lower layer heat-shrinkable fibers, shrink the lower layer and project the upper layer into a convex shape. A topsheet 1D for absorbent articles having a large convex portion 6a and a small convex portion 6b having a dome structure was manufactured. The thermal bonding emboss 4 is arranged at 5.5 pieces / cm ² , and the distance between two adjacent thermal bonding embosses 4 at the shortest distance of the surface sheet 1D after the heat shrinkage is 1.2 mm. The area was 3.1 mm ² .

Comparative Example 1
As shown in FIG. 9, the shape of the thermal bonding emboss 400 is rectangular, and emboss bonding is performed in the pattern shown in FIG. 9 from the upper layer side in which the upper layer is superimposed on the lower layer, and four thermal bonding embosses 400 are formed. A convex portion 600 surrounded by is formed. After embossing the laminate, hot air was passed under the same conditions as in Example to produce a top sheet 100 for absorbent articles having a large number of convex portions 600. The thermal bonding emboss 400 is arranged at 7.1 pieces / cm ² , and the interval between two adjacent thermal bonding embosses 400 at the shortest distance of the surface sheet 100 after heat shrinkage is 2.2 mm. The area was 3.1 mm ² .

Comparative Example 2
As shown in FIG. 10, the shape of the thermal bonding emboss 401 is a cross shape, and as shown in FIG. 10, a cross-shaped thermal bonding emboss is formed so as to form a convex portion surrounded by four thermal bonding embosses 401. 401 is formed symmetrically with a straight vertical bisector connecting the centroids of two adjacent thermal bonding embosses 401 at the shortest distance as a symmetry axis. Emboss bonding was performed in the pattern shown in FIG. 10 from the upper layer side of the laminate in which the upper layer was superimposed on the lower layer, and a convex portion 601 surrounded by four cross-shaped heat bonding embosses 401 was formed. After embossing the laminate, hot air was passed under the same conditions as in Example to produce a top sheet 601 for absorbent articles having a large number of convex portions 401. The cross-shaped thermal bonding emboss 401 is arranged at 7.1 pieces / cm ² , and the distance between two adjacent thermal bonding embosses 401 at the shortest distance of the surface sheet 601 after heat shrinkage is 1.6 mm. The area of the adhesive emboss 401 was 3.2 mm ² .

  For the surface sheets obtained in Examples and Comparative Examples 1 and 2, (1) contact area with skin, (2) friction coefficient with skin, (3) compression characteristics and (4) absorption performance, The results are shown in Table 1.

(1) Contact area with skin In order to evaluate the stickiness felt by the wearer when wearing the napkin and the quality of the stuffiness, the contact area between the skin and the napkin surface was measured by the following method.
〔Measuring method〕
About each surface sheet of an Example and a comparative example, the contact area with skin was measured with the following method.
A sample surface sheet is cut into a size of 60 mm × 80 mm, a pressureless state and a transparent acrylic plate with a weight of 50 g are placed on top, and a 250 g weight is placed on the acrylic plate, and 6.25 gf In a state where a load of / cm ² was applied, the surface shape of each 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 changed in the thickness direction from a no-load state to a 6.25 gf / cm ² load, 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. For image capture, the center of the sample is used, and two [Sunlight SL-230K2; manufactured by LPL Co., Ltd.] are used as light sources, and a CD camera (HV-37; manufactured by Hitachi Electronics Co., Ltd.). ) And a lens (Nikon Ai AF Nicol 24mmF2.8D) are connected by an F mount, an image is captured and processed using a Nexus NewQube (Ver. 4.22), and the contact area is measured. The “contact area ratio” was calculated by dividing by the area.

(2) Coefficient of friction with skin The coefficient of friction with skin was measured by the following method in order to evaluate the quality of rubbing with the skin that the wearer feels when wearing a napkin.
〔Measuring method〕
About each surface sheet of an Example and a comparative example, the friction coefficient with skin was measured with the following method.
Cut the sample surface sheet into a size of 50 mm x 50 mm and use a double-sided paper tape on a hooked weight (weight 211 g, length 63 mm x width 63 mm x thickness 7 mm) so that the adhesive surface of the sample is the back side Glued to. The weight to which the sample was adhered was allowed to stand on the acrylic plate so that the surface of the sample was on the lower side, a wire was attached to the hook, and attached to a tensile tester Tensilon RTC-1210A manufactured by Orientec via a pulley. The weight to which the sample was bonded 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 frictional force, and the friction coefficient was computed from the weight of the weight which adhered the sample.

(3) Compression characteristics In order to evaluate the cushioning feeling felt by the wearer when wearing a napkin, the compression characteristics with the skin were measured by the following method.
〔Measuring method〕
About each surface sheet of an Example and a comparative example, the compression characteristic was measured with the following method.
The compression characteristics were measured using a Kato Tech KES-G5 handy compression tester. A surface sheet as a sample was cut into a size of 5 cm × 10 cm and attached to a test bench. The cut sample was compressed between steel plates having a circular plane with an area of 2 cm ² . The compression speed was 20 μm / sec and the maximum compression load was 4.9 kPa. The recovery process was also measured at the same rate. The compression work WC is expressed by the following equation. Tm, T0 and P indicate respectively 4.9kPa (50gf / cm ²⁾ Thickness of time load, a load of 49Pa (0.5gf / cm ²⁾ when the thickness and measuring the time of loading.

(4) Liquid absorption rate In order to evaluate the quality of dry feeling felt by the wearer when wearing the napkin, the amount of liquid returned from the napkin surface was measured by the following method.
〔Measuring method〕
Place a sanitary napkin horizontally, put an acrylic plate with a cylinder with a 1 cm diameter injection port on the bottom, and inject 3 g of defibrinated horse blood (manufactured by Nippon Biotest Co., Ltd.) from the injection port. Hold that state for a minute. 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 top 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 determine the remaining amount of surface liquid.

  According to the results in Table 1, the surface sheet of the example has a lower contact area with the skin and a lower coefficient of friction than the surface sheets of Comparative Example 1 and Comparative Example 2, which further reduces stickiness and stuffiness. The effect of reducing the damage to the skin is obtained. Moreover, since the surface sheet of an Example has a high compression characteristic compared with the surface sheet of the comparative example 1, and the absorption performance (surface liquid residue) is low compared with the surface sheet of the comparative example 2, the surface sheet of an Example is It is compatible with cushion feeling (wearing feeling) and absorption performance, and the effect of improving the feeling of use can be obtained.

1A, 1B, 1C, 1D Absorbent article surface sheet 2 Upper layer 3 Lower layer 4 (4a, 4b, 4c, 4d, 4e, 4f, 4f, 4g, 4h) Thermal bonding emboss 5 Recess 6 Protrusion 6a Large protrusion 6b Small convex portion 61 Vertex of large convex portion 6a 62 Vertex c of small convex portion 6b Intermediate position of straight line connecting thermal bonding emboss 4a and thermal bonding emboss 4b

Claims (5)

By a number of regularly arranged thermal bonding embossing, the lower layer containing the heat-shrinkable fiber disposed on the non-skin contact surface side and the upper layer disposed on the skin contact surface side are intermittently bonded, A top sheet for an absorbent article in which the heat-shrinkable fiber of the lower layer is heat-shrinked,
There are a large number of large convex portions and small convex portions of a solid dome structure of two types surrounded by the thermal bonding embossing on the skin contact surface side of the upper layer, and the large convex portions and the small convex portions are , Each of which is formed in a polygonal shape surrounded by a plurality of adjacent thermal bonding embosses,
The large convex portion and the small convex portion are formed adjacent to each other,
The bottom area of the large convex part is at least twice the bottom area of the small convex part,
The top sheet for absorbent articles, wherein the height at the top of the large convex portion is higher than the height at the top of the small convex portion.   The top sheet for absorbent articles according to claim 1, wherein the bottom area of the large convex portion is four times or more the bottom area of the small convex portion.   The top sheet for absorbent articles according to claim 1 or 2, wherein the upper layer is a bulky nonwoven fabric selected from an air-through nonwoven fabric, an airlaid nonwoven fabric, or a resin-bonded nonwoven fabric.   The shape of each of a large number of the heat-bonded embossed portions is formed symmetrically with a perpendicular bisector of a line connecting the centers of gravity of the adjacent heat-bonded embossed portions as symmetry axes. The surface sheet for absorbent articles described in 1. A large number of the convex portions are composed of a large number of the large convex portions and a large number of the small convex portions,
The surface for absorbent articles according to any one of claims 1 to 4, wherein the number of corners of the large convex portion is twice the number of corners n of the small convex portion (3≤n≤4, n = integer). Sheet.

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