WO2015015970A1 - Absorbent article - Google Patents

Abstract

This diaper (1) has a vertically long absorbent body (5) provided with a surface sheet (2), a rear-surface sheet (3), and an absorbent section (4) positioned between the two sheets (2, 3). The absorbent body (5) is divided into a stomach-side region (A), a rear-side region (B), and a crotch region (C). The surface sheet (2) comprises a bulky unwoven fabric. The two lateral sections (5s, 5s) of the absorbent body (5) extending in the longitudinal direction (Y-direction) thereof in the section of the surface sheet (2) excluding the rear-side region (B) are provided with one or more pairs of bulky regions (9L) having a lower apparent density than that of the section (9h) having the highest apparent density in the center section (5m) of the crotch region (C).

Description

Absorbent articles

The present invention relates to an absorbent article such as a disposable diaper.

Conventionally, in order to prevent leakage of bodily fluids such as loose stool and menstrual blood, an absorbent article having a surface sheet with an uneven structure is known.
For example, in Patent Document 1, a plurality of first convex portions are provided on the skin facing surface of the central region disposed in the central portion extending in the longitudinal direction, and a pair of side regions disposed on the left and right sides of the central region. The disposable diaper provided with the surface sheet in which many 2nd convex parts whose height is higher than a 1st convex part was provided in each skin opposing surface is described. Since the disposable diaper described in Patent Document 1 has a large number of convex portions, the cushioning property at the time of wearing is good, for example, there is little wet back after soft stool absorption, and the feeling of use is good. Further, in the disposable diaper described in Patent Literature 1, in the crotch region, the height of the multiple second convex portions provided in the pair of side regions is higher than the height of the multiple first convex portions provided in the central region. Therefore, for example, it is excellent in preventing the side leakage of soft stool.

JP 2009-148445 A

However, the disposable diaper described in Patent Document 1 has a diaper width direction in which a plurality of second convex portions provided in each of the pair of side regions are arranged in series across the entire diaper longitudinal direction. A plurality of rows are formed. That is, in the disposable diaper described in Patent Document 1, a large number of second convex portions are provided from the back side region of each of the pair of side regions to the entire longitudinal direction of the ventral region. Since the second convex portion is provided in this way, for example, soft stool excreted in the dorsal region is difficult to spread in the width direction in the dorsal region, and a large amount of loose stools easily spread to the crotch region through the central region. . If a large amount of loose stool spreads into the crotch area and exceeds the absorption capacity of the crotch area, it may not be possible to prevent side leakage of the soft stool, and there is a need to further improve side leakage prevention. was there.

Therefore, the present invention relates to providing an absorbent article that can satisfy the aforementioned needs.

The present invention comprises a liquid-permeable surface sheet disposed on the skin facing surface side, a liquid-impermeable back sheet disposed on the non-skin facing surface side, and an absorber disposed between these both sheets. The present invention relates to an absorbent article having a vertically long absorbent main body. The absorbent main body is divided into a ventral region located on the wearer's ventral side when worn, a dorsal region located on the dorsal side, and a crotch region disposed between the ventral region and the dorsal region. ing. The surface sheet is made of a bulky nonwoven fabric, and the surface sheet excluding the back side region has the highest apparent density in the center portion of the crotch region on both side portions along the longitudinal direction of the absorbent main body. At least one pair of bulky regions having an apparent density lower than that of the portion is arranged.

FIG. 1 is a partially broken plan view of an unfolded disposable diaper according to an embodiment of the present invention as viewed from the surface sheet side. 2 is a cross-sectional view taken along the line II of FIG. FIG. 3 is a plan view of the absorbent core that constitutes the absorbent body of the disposable diaper shown in FIG. 1. FIG. 4 is a plan view of the top sheet having the disposable diaper shown in FIG. 1. FIG. 5 is a schematic view showing an example of a press roll used for manufacturing a deployable disposable diaper according to an embodiment of the present invention. FIG. 6 is a plan view of an absorbent core used in a disposable diaper according to another embodiment of the present invention (corresponding to FIG. 3). FIG. 7 is a plan view of an absorbent core used in a disposable diaper according to still another embodiment of the present invention (corresponding to FIG. 3). FIG. 8 is a plan view of an absorbent core used in a disposable diaper according to still another embodiment of the present invention (corresponding to FIG. 3). FIG. 9 is a plan view of an absorbent core used in a disposable diaper according to still another embodiment of the present invention (corresponding to FIG. 3). FIG. 10 is a plan view of a topsheet used in the disposable diaper having the absorbent core shown in FIG. 6 which is another embodiment of the present invention (corresponding to FIG. 4). FIG. 11 is a plan view of a topsheet used in the disposable diaper having the absorbent core shown in FIG. 7 which is another embodiment of the present invention (corresponding to FIG. 4). 12 is a plan view of another topsheet used in the disposable diaper having the absorbent core shown in FIG. 7 which is another embodiment of the present invention (corresponding to FIG. 4). FIG. 13 is a plan view of a top sheet used for a disposable diaper having the absorbent core shown in FIG. 8 which is another embodiment of the present invention (corresponding to FIG. 4). FIG. 14 is a plan view of a top sheet used for a disposable diaper having the absorbent core shown in FIG. 9 which is another embodiment of the present invention (corresponding to FIG. 4). FIG. 15 is a perspective view of a topsheet provided in the disposable diaper used when producing the disposable diapers of Example 1 and Comparative Examples 1 to 3. FIG. 16 is a perspective view of a topsheet provided in the disposable diaper used when producing the disposable diapers of Example 2 and Comparative Examples 4 to 6.

Detailed Description of the Invention

Hereinafter, the absorbent article of the present invention will be described based on preferred embodiments with reference to FIGS. FIG. 1 is a partially cutaway plan view of an unfolded disposable diaper according to an embodiment of the present invention as viewed from the top sheet side, and FIG. 2 is a cross-sectional view taken along the line II of FIG. ing. 3 shows a plan view of the absorbent core of the absorbent body having the disposable diaper shown in FIG. 1, and FIG. 4 shows a plan view of the top sheet having the disposable diaper shown in FIG. Yes.

As shown in FIG. 1, the disposable diaper 1 of this embodiment (hereinafter also referred to as “diaper 1”) has a liquid-permeable surface sheet 2 disposed on the skin facing surface side and a non-skin facing surface side. It has a vertically long absorbent main body 5 provided with a hardly liquid permeable back sheet 3 disposed and an absorbent body 4 disposed between both sheets 2 and 3. The absorptive main body 5 includes a ventral region A located on the abdomen side of the wearer when worn, a dorsal region B located on the dorsal side, and a crotch region C disposed between the ventral region A and the dorsal region B It is divided into. As shown in FIG. 1, the diaper 1 is formed symmetrically with respect to a center line CL extending in the longitudinal direction.
In the present invention, in the developed state of the diaper, the abdominal region A, the back region B, and the crotch region C are determined by dividing into the following diapers 1) to 3). Specifically, in the diaper of the present embodiment, in the expanded state of the diaper (FIG. 1), 1) a region corresponding to the constricted position of the outer packaging body is defined as a crotch region C, and on the stomach side of the wearer from the crotch region C The region located is defined as a ventral region A, and the region located on the back side of the wearer from the crotch region C is defined as a dorsal region B. The above-mentioned constricted position refers to a region where the width of the outer packaging body is narrowed by binding the outer packaging body from both side portions along the Y direction, which will be described later, to the center in the width direction (X direction, which will be described later). The outer packaging referred to here means a sheet disposed on the outermost side of the diaper on the non-skin side, and generally refers to a nonwoven fabric disposed on the outer side of a liquid-impermeable film sheet. In the case of only the poorly permeable film, the film is regarded as an envelope. The film sheet and the non-woven fabric are the same size, or the non-woven fabric as an envelope is several millimeters larger. In the abdominal side A and the back side B, the outer envelope protrudes from the crotch C in the width direction and is wide. In addition, in the case of a diaper in which the outer side of the outer packaging body is linearly formed in the longitudinal direction (Y direction) and the panels on both sides of the back side are fastened, the region including the panel is defined as the back side region B, An abdominal side corresponding to the length, that is, a part where the panels overlap when worn is defined as an abdominal area A, and a space between the back side area B and the abdominal area A is defined as a crotch area C. 3) In the case of a diaper whose region cannot be determined from the above 1) and 2), when the diaper is divided into three equal parts in the longitudinal direction in the diaper expanded state, the wearer's ventral side is the ventral region A and the dorsal side. Is the back region B, and the crotch side between the ventral side and the back side is the crotch region C.

The diaper 1 will be described in detail. As shown in FIG. 1, the absorbent main body 5 of the diaper 1 is in a stretched state (hereinafter also referred to as “Y direction”. Y direction: direction parallel to the center line CL). 2) has a ventral region A, a crotch region C, and a dorsal region B. The abdomen A, the crotch C, and the dorsal B are located in the crotch region C in a state where the diaper 1 is extended, and are located closer to the wearer than the crotch region. The region is defined as a ventral region A, and the region located on the back side of the wearer relative to the crotch region is defined as a dorsal region B (because it corresponds to the diaper classified as (1) above). The direction orthogonal to the longitudinal direction (Y direction) will be described as the width direction of the diaper 1 (hereinafter also referred to as “X direction”). Moreover, in this specification, a "skin opposing surface" is a surface distribute | arranged to a wearer's skin side at the time of wear among the front and back both surfaces of each member, such as the surface sheet 2 which comprises the diaper 1, The “skin facing surface” is a surface of the front and back surfaces of each member such as the surface sheet 2 that is directed to the side opposite to the wearer's skin side when worn.

In the diaper 1, as shown in FIG. 1, the left and right side edges of the ventral region A and the left and right side edges of the back side region B extend outward in the width direction (X direction) from the left and right side edges of the crotch region C. ing. The left and right side edges of the crotch region C are curved in an arc shape inward in the width direction (X direction), and the central part in the longitudinal direction (Y direction) is constricted inward as a whole. Yes.

In the diaper 1, as shown in FIG. 1, the top sheet 2 and the back sheet 3 respectively extend outward from the left and right side edges and the front and rear end edges of the absorber 4 that is long in the longitudinal direction (Y direction). As shown in FIG. 1, the surface sheet 2 has the same length in the longitudinal direction (Y direction) as the length in the longitudinal direction (Y direction) of the back sheet 3, but as shown in FIG. The dimension in the direction (X direction) is smaller than the dimension in the width direction (X direction) of the back sheet 3. Each of the top sheet 2 and the back sheet 3 is joined to each other directly or through another member at the extended portion extending outward from the periphery of the absorbent body 4, and sandwiches and fixes the absorbent body 4. is doing. The absorbent body 4 is composed of an absorbent core 41 in which particles of a water-absorbing polymer are held in an aggregate of fibers such as pulp fibers, and a core wrap sheet 42 that covers the absorbent core 41. The absorbent core 41 and the top sheet 2 of the absorbent body 4 will be described in detail below.

As shown in FIG. 1 and FIG. 2, a three-dimensional gather forming sheet 62 having elastic members 61 fixed in a stretched state in the Y direction is provided on both sides along the longitudinal direction (Y direction) of the diaper 1. It arrange | positions and is fixed to the side part of the sheet | seat 2, and a pair of solid gathers 6 and 6 (refer FIG. 2) are formed by this. In addition, as shown in FIGS. 1 and 2, leg elastic members 63 for forming leg gathers are arranged in an extended state in the Y direction on both side portions along the longitudinal direction (Y direction) of the diaper 1. Leg gathers are formed by the contraction of the leg elastic members 63. Moreover, although not shown in figure, the waist part elastic member for waist gathers formation is distribute | arranged to the expansion | extension state in the X direction in the longitudinal direction (Y direction) edge part of the back side area | region B side of the diaper 1, and this waist part A waist gather may be formed by contraction of the elastic member.

As described above, the diaper 1 is a so-called unfolded diaper. As shown in FIG. 1, a pair of fastening tapes 7 and 7 are provided on both left and right edges of the dorsal region B. A landing tape 8 for fastening the fastening tapes 7 is provided on the outer surface (non-skin facing surface).

In the present embodiment, the absorbent body 4 has an absorbent core 41, and the absorbent core 41 has a pulp-free space 41s that constitutes the absorbent core 41 as shown in FIGS. ing. In the crotch region C, the space 41s of the absorbent core 41 included in the diaper 1 is pulped in an arc shape convex inward from both side edges along the longitudinal direction (Y direction) of the absorbent core 41 toward the center line CL. It is formed lacking. In addition, although the absorptive core 41 with which the diaper 1 is provided has the space part 41s formed lacking the pulp, a pulp is laminated | stacked a little instead of the space part 41s, and the basic weight of a pulp is relative. It may have a low low basis weight part. In the case of having a low basis weight part, the basis weight of the low basis weight part is preferably as low as compared to other parts, and specifically, the ratio of the low basis weight part / high basis weight part is 70% or less, more preferably. If it is 50% or less, a sufficiently satisfactory effect can be obtained. The absorbent body 4 included in the diaper 1 is formed by covering an absorbent core 41 having a space portion 41 s formed in an inwardly convex arc shape with a single core wrap sheet 42.

When it explains in full detail about the surface sheet 2, the surface sheet 2 consists of a bulky nonwoven fabric. The top sheet 2 excluding the back region B has a central portion of the crotch region C on both side portions 5s and 5s along the longitudinal direction (Y direction) of the absorbent main body 5, as shown in FIGS. At least a pair of bulky regions 9L having an apparent density lower than that of the portion 9h having the highest apparent density in 5m are arranged. In the diaper 1 of the present embodiment, the bulky region 9L is disposed not only in the back side region B but also in the ventral region A, as shown in FIG. The center portion 5m is a portion having a width (length in the X direction) of about 70 mm including the center line CL and extending along the center line CL in a state where the diaper 1 is extended. In the diaper 1, the crotch region C is narrower in the width direction (X direction) than the center portion 5 m and is located outside the width direction (X direction). Both side portions 5s, 5s and the central portion 5m extend from the ventral region A to the dorsal region B of the absorbent main body 5, that is, over the entire region in the longitudinal direction (Y direction). The portion 9h with the highest apparent density may be in the region T of the central portion 5m of the crotch region C, and is determined by cutting out a portion in the range of 4 cm ² as will be described later. The measurement of the apparent density will be described in detail below.

<Measurement method of apparent density>
The most apparent dense portion 9h is first from within the region T in the central portion 5m of the crotch region C of the surface sheet 2 is cut in the thickness direction cut portion of the range of 4 cm ^2. The portions cut out from the region T of the topsheet 2 are a central portion in the region T of the topsheet 2, a portion near the back region B in the region T, and a portion near the ventral region A in the region T. Then, each apparent thickness of each cut surface is measured using a Keyence Corporation VHX-1000 digital microscope with a magnification of 20 to 100 and no load. Next, each apparent density is measured by dividing the basis weight of each cut-out portion by each apparent thickness measured. And, the highest value among the apparent density of the central portion in the region T of the surface sheet 2, the apparent density of the portion near the back side region B in the region T, and the apparent density of the portion near the ventral region A in the region T. The portion is a portion 9h having the highest apparent density in the central portion 5m of the crotch region C. In addition, when there is no difference in the apparent density of the center part in the area | region T of the surface sheet 2, the part near the back | dorsal area | region B in the area | region T, and the part near the ventral | abdominal area A in the area | region T, those average values Is the apparent density of the portion 9h having the highest apparent density.
The apparent density of the bulky region 9L is cut in the thickness direction and a portion in the range of 4 cm ² is cut out from the bulky region 9L, and the apparent density is measured in the same manner as the portion 9h having a high apparent density.

The top sheet 2 of the diaper 1 is provided with a pair of bulky regions 9L, 9L, and the region excluding the pair of bulky regions 9L, 9L is a portion 9h having a high apparent density, In the portion 9h having a high apparent density, the density is uniform. A pair of bulky region 9 L, 9 L, the area of the total, preferably 5 cm ² or more, more preferably 30 cm ² or more, and preferably 150 cm ² or less, more preferably 60cm ² or less, and more specifically, preferably 5 cm ² or more 150 cm ² or less, more preferably 30 cm ² or more 60cm ² or less.

The apparent density of the high apparent density portion 9h is preferably 0.02 g / cm ³ or more, more preferably 0.03 g / cm ³ or more, and preferably 0.1 g / cm ³ or less, more preferably 0.07 g. / Cm ³ or less, more specifically, preferably 0.02 g / cm ³ or more and 0.1 g / cm ³ or less, more preferably 0.03 g / cm ³ or more and 0.07 g / cm ³ or less.
The apparent density of the bulky region 9L is preferably 0.008 g / cm ³ or more, more preferably 0.02 g / cm ³ or more, and preferably 0.05 g / cm ³ or less, more preferably 0.04 g / cm ³ or less , more particularly preferably 0.008 g / cm ³ or more 0.05 g / cm ^3, more preferably not more than 0.02 g / cm ³ or more 0.04 g / cm ^3.
From the viewpoint of preventing side leakage, the apparent density of the bulky region 9L is preferably lower than the apparent density of the high apparent density portion 9h and not more than 0.8 times the apparent density of the high apparent density portion 9h. More preferably, it is 0.5 times or less.

In the present embodiment, the bulky region 9L is arranged at a position corresponding to the space 41s or the low basis weight portion of the absorbent core 41 constituting the absorber 4. Specifically, when the diaper 1 is viewed in plan as shown in FIG. 1, a bulky region 9 </ b> L having a shape similar to the contour is within the contours of the spaces 41 s and 41 s on both sides of the absorbent core 41. Is arranged. In the diaper 1, a pair of bulky regions 9 </ b> L and 9 </ b> L are arranged corresponding to the pair of space portions 41 s and 41 s. That is, the space portion 41s of the absorbent core 41 is formed in an arc shape convex inward from the side edge along the longitudinal direction (Y direction) of the absorbent core 41 toward the center line CL. Similar to the shape of 41s, the bulky region 9L of the topsheet 2 is also formed in an arc shape convex inward from the side edge along the longitudinal direction (Y direction) of the topsheet 2 toward the center line CL. .

In the diaper 1, the one side 90 arranged on the innermost side among the sides constituting the outline of the bulky region 9 </ b> L in a plan view as shown in FIG. 1 is formed in an inwardly convex arc shape. The sides 90, 90 constituting the pair of bulky regions 9L, 9L are opposed to each other. That is, the shape of the pair of bulky regions 9L, 9L of the diaper 1 is formed symmetrically with respect to the center line CL.

As shown in FIGS. 2 and 4, the top sheet 2 of the diaper 1 has a bulky structure having a concavo-convex structure including a large number of convex portions 21 protruding on the skin facing surface side and concave concave portions 22 adjacent to the convex portions 21. Made of non-woven fabric. The surface sheet 2 has a structure in which the skin facing surface side is uneven, and the non-skin facing surface side is flat. The top sheet 2 of the diaper 1 has a first layer 23 and a second layer 24 that are sheet-like materials. The first layer 23 constitutes the skin facing surface of the topsheet 2, and the second layer 24 constitutes the non-skin facing surface of the topsheet 2. The first layer 23 is formed with a large number of convex portions 21 that protrude to the skin facing surface side and have a hollow inside, and concave portions 22 are formed between the convex portions 21. Further, the second layer 24 is planar. In the recess 22, the first layer 23 and the second layer 24 are joined via a joint (not shown). The recess 22 includes a joint (not shown) and a non-joint that surrounds the entire circumference of the joint (not shown).

The first layer 23 and the second layer 24 are made of the same or different sheet-like materials. This sheet-like material is substantially non-stretchable. As the material of the sheet, any material that is used in conventionally known diapers and is substantially non-stretchable can be used without particular limitation. For example, various nonwoven fabrics such as a nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunlace nonwoven fabric, and a needle punched nonwoven fabric manufactured by the card method can be used. Moreover, the film etc. which enabled liquid permeation | transmission by the opening means can also be used. When a nonwoven fabric is used as the sheet material, the fineness of the constituent fibers is 1 dtex or more, preferably 1.5 dtex or more, and 20 dtex or less, preferably 5.6 dtex or less, more specifically 1 dtex or more and 20 dtex or less. It is preferable from 1.5 dtex or more and 5.6 dtex or less from points, such as ensuring the intensity | strength of the surface sheet 2, and the improvement of the touch.

In the surface sheet 2 of the diaper 1, the convex portion 21 is surrounded by a concave portion 22 having four joint portions (not shown) as shown in FIG. 4, and its bottom surface is rectangular in plan view. The convex portion 21 is a flat rectangular parallelepiped or truncated quadrangular pyramid with rounded ridgelines as a whole. On the other hand, the recess 22 is also rectangular in plan view. In addition, in the surface sheet 2 of the diaper 1, the convex portion 21 is surrounded by four joint portions (not shown) (concave portions 22), but there are more joint portions (not shown) (concave portions 22) than four points. Specifically, the convex portion (not shown) is surrounded by a concave portion having six joint portions (not shown). Moreover, the convex part is a flat rectangular parallelepiped or truncated cone with rounded ridgelines as a whole.

In the surface sheet 2 of the diaper 1, the convex part 21 and the recessed part 22 have comprised the row | line | column arrange | positioned alternately along the longitudinal direction (Y direction), and this row | line | column is the width direction. It is arranged in multiple rows in the (X direction). When attention is paid to any one convex portion 21 in one row, the convex portion 21 is located at a position adjacent to the one convex portion 21 in the left and right rows adjacent to the row in the width direction (X direction). Is not located. That is, in two rows adjacent in the width direction (X direction), the joint portions (not shown) (concave portions 22) are arranged so as to be shifted by a half pitch in the longitudinal direction (Y direction). Therefore, when attention is paid to any one joint (not shown) (concave portion 22) in one row, the one joint portion (not shown) (concave portion 22) is surrounded by the convex portion 21 at the front and rear and right and left. This is a closed depression formed. That is, when the top sheet 2 is viewed in plan from the first layer 23 side, joints (not shown) (concave portions 22) are arranged in a staggered pattern, and the convex portions 21 are also arranged in a staggered pattern. Yes.

In the surface sheet 2 of the diaper 1, the basis weight of the bulky region 9L and the basis weight of the portion 9h having the highest apparent density in the central portion 5m of the crotch region C are the same, and the first layer 23 and the first layer 23 The overall basis weight of the topsheet 2 including the two layers 24 is uniform. Total basis weight of the topsheet 2 is preferably 15 g / ^{m 2} or more, more preferably 20 g / ^{m 2} or more, and preferably 150 g / ^{m 2} or less, more preferably 60 g / ^{m 2} or less, more specifically Is preferably 15 g / m ² or more and 150 g / m ² or less, more preferably 20 g / m ² or more and 60 g / m ² or less.

In the apparent thickness of the bulky region 9L, specifically the top sheet 2 of the diaper 1, the height of the convex portion 21 located in the bulky region 9L is the apparent thickness of the portion 9h having the highest apparent density, specifically the diaper 1 In the surface sheet 2, it is higher than the height of the convex part 21 located in the area | region except the bulky area | region 9L. The apparent thickness is measured by the measurement method used in the above-described apparent density measurement method.

The apparent thickness of the bulky region 9L is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 4 mm or less, more specifically 0.5 mm or more and 5 mm or less. More preferably, it is 1 mm or more and 4 mm or less.
The apparent thickness of the portion 9h having a high apparent density is preferably 0.3 mm or more, more preferably 0.5 mm or more, and preferably 3 mm or less, more preferably 2 mm or less, more specifically 0.3 mm or more and 3 mm. Or less, more preferably 0.5 mm or more and 2 mm or less.

In the surface sheet 2 of the diaper 1, the apparent thickness of the bulky region 9L is higher than the apparent thickness of the portion 9h having a high apparent density, and from the viewpoint of further improving the prevention of side leakage, It is preferably higher than the total thickness of the apparent thickness and the thickness of the absorbent body 4, preferably 1.2 times or more of the apparent thickness of the portion 9 h having a high apparent density, and 1.6 times or more. Is more preferable.

Moreover, when the diaper 1 is seen in a plan view as shown in FIG. 1, the maximum width W1 of the bulky region 9L is wider than the width W2 of the convex portion 21 of the nonwoven fabric of the concavo-convex structure constituting the surface sheet 2 in the bulky region 9L. Is formed. The width W <b> 2 of the convex portion 21 indicates a dimension along the X direction at the bottom of the convex portion 21.

The maximum width W1 of the bulky region 9L is preferably 2 mm or more, more preferably 5 mm or more, and preferably 50 mm or less, more preferably 20 mm or less, more specifically 2 mm or more and 50 mm or less, preferably 5 mm or more. More preferably, it is 20 mm or less.
The width W2 of the convex portion 21 located in the bulky region 9L is preferably 1 mm or more, more preferably 2 mm or more, and preferably 30 mm or less, more preferably 5 mm or less, more specifically 1 mm or more and 30 mm or less. Is preferably 2 mm or more and 5 mm or less. In addition, in the surface sheet 2 of the diaper 1, the width | variety of the convex part 21 located in the area | region except the bulky area | region 9L is the same as the width W2 of the convex part 21 located in this bulky area | region 9L.

As described above, in the top sheet 2 of the diaper 1, the maximum width W1 of the bulky region 9L is formed wider than the width W2 of the convex portion 21 of the concavo-convex structure of the topsheet 2 in the bulky region 9L. From the viewpoint of further preventing side leakage, the width W2 of the convex portion 21 of the nonwoven fabric is preferably 2 times or more, and more preferably 5 times or more.

In the surface sheet 2 of the diaper 1, the length L1 of the convex part 21 located in the bulky region 9L in the Y direction is the same as the length in the Y direction of the convex part 21 located in the region excluding the bulky region 9L. The length L1 of the convex portion 21 indicates a dimension along the Y direction at the bottom of the convex portion 21.
The length L1 of the convex portion 21 is preferably 1 mm or more, more preferably 2 mm or more, and preferably 30 mm or less, more preferably 5 mm or less, and more specifically 1 mm or more and 30 mm or less, preferably 2 mm or more. More preferably, it is 5 mm or less.

The diaper 1 of the present embodiment is not particularly limited in its manufacturing method, and can be manufactured by any method. Hereinafter, the preferable example of the manufacturing method of the diaper 1 of this embodiment is demonstrated, referring FIG.

As shown in FIG. 5, the press roll 100 is used. The press roll 100 includes a first roll 102 having a pair of recessed concave portions 101 forming a pair of bulky regions 9L on the peripheral surface, and a second roll 103 having a flat peripheral surface. The pair of concave portions 101 of the first roll 102 are formed at positions corresponding to the pair of space portions 41 s, 41 s or the low basis weight portion of the absorbent core 41 constituting the absorber 4, and the space portion 41 s or It is formed in a shape similar to the outline of the low basis weight part. In addition, the recessed part 101 has the depth of the dent deeper than the height of the convex part 21 of the surface sheet 2.

First, as the surface sheet 2 of the diaper 1, for example, the surface sheet described in Japanese Patent Application Laid-Open No. 2004-174234 related to the previous application of the present applicant is used.
Moreover, as the absorptive core 41 of the diaper 1, the absorptive core which formed a pair of space part 41s, 41s or the low basic weight part by vacuuming in accordance with a conventional method is used. The absorbent core 4 of the diaper 1 is formed by covering the absorbent core 41 having the pair of space portions 41 s, 41 s or the low basis weight portion thus formed with one core wrap sheet 42.

Next, the belt-like top sheet 2 and the belt-like back sheet 3 are fixed in accordance with a conventional method so as to sandwich the plurality of absorbers 4, 4. The leg elastic member 63 is fixed in accordance with a conventional method in a state where the leg elastic member 63 is extended in the transport direction along both sides of the belt-shaped topsheet 2 in the transport direction. In addition, on the upper surface side of the belt-shaped surface sheet 2 (the surface side on which the plurality of convex portions 21 are arranged), a belt-shaped three-dimensional gather forming sheet 62 is provided along each side of the belt-shaped surface sheet 2 in the conveying direction. It fixes according to a conventional method, and fixes according to a conventional method in the state which extended the elastic member 61 for solid gathering to the conveyance direction to the width direction inner side of each solid gather forming sheet 62.

The continuous body 104 of the disposable diaper 1 formed as described above is opposed to the first roll 102 of the press roll 100 on the upper surface side (the surface side on which the plurality of convex portions 21 are arranged) of the belt-shaped topsheet 2. In this way, the sheet is conveyed between the first roll 102 and the second roll 103. Then, by pressing the conveyed continuous body 104 of the disposable diaper 1 at a portion excluding the pair of concave portions 101 of the first roll 102, the height of the convex portion 21 is lowered and the pair of concave portions 101. The height of the convex portion 21 located in the region corresponding to is maintained as it is. Thus, the convex part located in the pair of concave portions 101 in which the height of the convex part 21 is maintained as it is becomes the convex part 21 located in the pair of bulky regions 9L and 9L, and the height of the convex part 21 is low. The convex portion located in the region excluding the pair of concave portions 101 thus formed becomes the convex portion 21 located in a region other than the pair of bulky regions 9L and 9L (part 9h having a high apparent density). The continuous body 105 of the disposable diaper 1 provided with the strip | belt-shaped surface sheet 2 which has a pair of bulky area | regions 9L and 9L intermittently in a conveyance direction is obtained through the above processes, The continuous body of this disposable diaper 1 The disposable diaper 1 is continuously obtained by cutting 105 with a known cutting means. In addition, when pressing with the 1st roll 102 and the 2nd roll 103 of the press roll 100, you may apply heat and you may press at normal temperature.

In addition, the manufacturing method of the disposable diaper 1 provided with the above-described pair of bulky regions 9L and 9L includes the first roll 102 and the second roll 103 of the press roll 100 after the continuous body 104 of the disposable diaper 1 is manufactured first. For example, only the belt-like topsheet 2 is pressed using the first roll 102 and the second roll 103 of the press roll 100, and the pair of bulky regions 9L and 9L are intermittently moved in the transport direction. You may form the belt-shaped surface sheet 2 distribute | arranged. Specifically, the absorptivity constituting the plurality of absorbent bodies 4 that are intermittently supplied in the transport direction with the belt-like topsheet 2 intermittently having the pair of bulky regions 9L, 9L formed in this way. The disposable diaper 1 formed by forming the continuous body 105 of the disposable diaper 1 as described above so as to be disposed at a position corresponding to the pair of space portions 41s, 41s or the low basis weight portion of the core 41. The disposable diaper 1 may be continuously manufactured by cutting the continuum 105 with a known cutting means.

The formation material of the disposable diaper 1 of this embodiment is demonstrated.
The back sheet 3 and the three-dimensional gather forming sheet 62 can be used without particular limitation as long as they are normally used for absorbent articles such as disposable diapers. For example, as the back sheet 3, a resin film or a laminate of a resin film and a nonwoven fabric can be used. As the three-dimensional gather forming sheet 62, a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used.
The fastening tape 7 can be used without particular limitation as long as it is usually used for absorbent articles such as disposable diapers. For example, male members in “Magic Tape (registered trademark)” (manufactured by Kuraray Co., Ltd.), “Quicklon (registered trademark)” (manufactured by YKK), “Majikurosu (registered trademark)” (manufactured by Kanebo Bell Touch), etc. Can be used.

As the absorptive core 41 that constitutes the absorbent body 4, a structure in which absorbent polymer particles are held in an aggregate of fibers such as pulp fibers can be used. As the covering material 42 constituting the absorbent body 4, a hydrophilic sheet, for example, a core-wrap sheet made of a water-permeable thin paper (tissue paper) or a water-permeable nonwoven fabric can be used.
Examples of the elastic member 61, the leg elastic member 63, and the waist elastic member for forming a three-dimensional gather include natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, and polyethylene-such as ethyl acrylate-ethylene. A thread-like stretchable material made of an α-olefin copolymer or the like can be used.

As the adhesive used for fixing each member, any adhesive that can be used for absorbent articles such as disposable diapers can be used without particular limitation. For example, a hot melt adhesive can be used. Examples of hot melt adhesives include blocks such as styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), and styrene-ethylene-butylene-styrene copolymer (SEBS). Copolymer-based hot melt adhesives may be mentioned.

The effect at the time of using the disposable diaper 1 of embodiment of this invention mentioned above is demonstrated.
Since the diaper 1 is formed from a bulky nonwoven fabric, the diaper 1 has a good cushioning property when worn, has little wet back after absorption of body fluids, and has a good feeling of use. Further, as shown in FIG. 1, the diaper 1 has a pair of bulky regions 9L and 9L arranged in a portion excluding the back side region B of the topsheet 2, so that, for example, loose stool excreted in the back side region B However, it is easy to spread in the width direction (X direction) in the back side region B, and is easily diffused sufficiently in the back side region B. Therefore, for example, the amount of loose stool that spreads to the crotch region C through the central region 5m can be suppressed, and the soft stool that spreads to the crotch region C is suppressed by the pair of bulky regions 9L and 9L, further improving the side leakage prevention property of the soft stool. You can do it.

Moreover, as for the diaper 1, the absorptive core 41 which comprises the absorber 4 has a pair of space parts 41s and 41s as shown in FIG. 3, and as shown in FIG. , 41s, a pair of bulky regions 9L, 9L are arranged. Therefore, for example, soft stools that are dammed in the bulky regions 9L and 9L are easily absorbed into the absorbent core 41 via the pair of space portions 41s and 41s, and the side leakage prevention property of the soft stools can be further improved. .

Further, as shown in FIG. 1, the diaper 1 has a bulky region 9 </ b> L not only in the dorsal region B but also in the ventral region A and disposed in the crotch region C. Therefore, even if the diaper 1 in a state of being pressurized by packaging is taken out and used, the bulk of the bulky region 9L can be maintained, and the side leakage preventing property of soft stool can be further improved.

In the diaper 1 in which the bulky region 9L is arranged only in the crotch region C, the bulk of the bulky region 9L can be maintained as described above, and the apparent density in the crotch region C is lowered by folding and packaging. The state of the surface sheet 2 is maintained. As a result, even when the packaged diaper 1 is taken out and used, the bulk of the bulky region 9L can be maintained, and folds generated in an absorbent article such as a normal diaper are reduced. Liquid bleeding to the side of the property article (induction of leakage), uncomfortable feeling at the time of wearing, and the likelihood of rubbing are reduced.

In the manufacturing method of the diaper 1 using the press roll 100 described above, the treatment of the topsheet 2 in the crotch region C is performed by changing the fiber fusion state of the topsheet 2 from the viewpoint of stabilizing the low density state. Although it is preferable to increase it from 9L (increase the amount of fusion and the fusion point), it usually tends to lower the texture. Therefore, in general, it is conceivable to maintain the texture (softness) by treatment of the concave portion (absorber side) of the concavo-convex structure or treatment at a relatively low temperature, but the stability is difficult and the effect is low. Sometimes. In addition, depending on the configuration of the absorbent article, the effect may be reduced by a bulky second sheet and an absorbent body that are difficult to maintain a low density state.
However, in the diaper (absorbent article) of the present invention, when the crotch region C is folded in two or three, the crotch region C is folded in a shape in which the absorbers face each other between the crotch regions or different regions (back side or belly side). It is. Furthermore, since there are few folds by folding, it is hard to form a clearance gap, a fold shape is stabilized, the surface sheet 2 is stably pinched | interposed, and it is easy to maintain a low-density state. In particular, in a surface sheet using a core-sheath fiber having a sheath component of polyethylene (the core component is polyester, polypropylene, or the like), even in a treatment at a relatively low temperature of 60 to 90 ° C., preferably 65 to 80 ° C., The top sheet 2 is stably sandwiched, and a low density state is easily maintained, and a stable effect is obtained for a long time.

As a configuration of an absorbent article such as a diaper that exhibits a stable effect, a normal configuration can be used due to the stability effect of the folded shape, but the thickness of the absorber gradually decreases from the central region to the side periphery. If the shape of the absorber in the central region is partially thickened like the shape, a region with enhanced adhesion is formed, and the effect can be enhanced.
In addition, when the adhesive is partially disposed between the top sheet 2 and the absorber 4 or the absorber surface side of the top sheet has a partial convex structure, the fixability may be partially enhanced. And stability is improved.

As for the folding of absorbent articles such as diapers, the folding surfaces are stabilized by the absorption surfaces facing each other, the compression to the topsheet 2 at the portion where the absorbent body 4 overlaps is made uniform, and the topsheet 2 in the crotch region C In addition to obtaining the above-described function by maintaining a higher density than the portion in the bulky region 9L, it provides a new effect that smoothness and a sense of incongruity can be stably obtained.

Furthermore, if the absorbent article such as a folded diaper is in a state of being stacked by a package, it is easy to obtain an effect over a long period of time, and stability is improved as compared with a single case. This effect is effective even when the package is opened, as long as a plurality of the layers are stacked.

Moreover, as shown in FIG.2 and FIG.4, since the surface sheet 2 consists of a bulky nonwoven fabric which has a concavo-convex structure provided with many convex parts 21 and recessed parts 22, the diaper 1 is easy to form the bulky area | region 9L. Further, the feeling of use can be further improved, and the side leakage prevention property of soft stool can be further improved.
Moreover, as shown in FIG.2 and FIG.4, the surface sheet 2 of the diaper 1 has an apparent thickness of the bulky region 9L larger than an apparent thickness of the portion 9h having the highest apparent density in the central portion 5m of the crotch region C. Since it is high, the soft stool spreading in the width direction (X direction) in the crotch region C can be easily dammed, and the side leakage prevention property of the soft stool can be further improved.

The diaper 1 has a pair of bulky regions 9L, 9L formed symmetrically with respect to the center line CL, and the sides 90, 90 are opposed to each other and are formed in an inwardly convex arc shape. The diffusion width of soft stools becomes narrower toward the center of the crotch region C. Therefore, the loose stool excreted in the dorsal region B easily spreads toward the center of the crotch region C through the central region 5m, and the side leakage prevention property of the soft stool can be further improved.

Moreover, as shown in FIG. 1, the diaper 1 is formed so that the maximum width W1 of the bulky region 9L is wider than the width W2 of the convex portion 21 of the topsheet 2 in the bulky region 9L. Therefore, even if the diaper 1 in a state pressurized by packaging is taken out and used, the shape of the convex portion 21 in the bulky region 9L can be maintained, and the side leakage prevention property of soft stool can be further improved. it can.

The disposable diaper which is an embodiment of the absorbent article of the present invention is not limited to the disposable diaper 1 of the above-described embodiment, and can be appropriately changed.

For example, in the disposable diaper 1 of the above-mentioned embodiment, as shown in FIGS. 1 and 3, the absorbent core 41 of the absorbent body 4 is in the crotch region C in the longitudinal direction (Y direction) of the absorbent core 41. It has a space 41 s formed by lacking pulp in a circular arc convex inward from both side edges along the center line CL, or a low basis weight part formed by lowering the basis weight of the pulp. Instead of the shape of the space portion 41 s or the low basis weight portion of the absorbent core 41, the space portion 41 s or the low basis weight portion is the length of the absorbent core 41 in the crotch region C as shown in FIG. It is located inward from both side edges along the direction (Y direction), and the shape thereof may be formed in an arc shape convex inward toward the center line CL.

Moreover, as shown in FIG. 7, the space part 41s or the low basis weight part may have a first space part 41s1 and a second space part 41s2. Specifically, in the crotch region C, the first space portion 41s1 is formed in an arc shape convex inward from both side edges along the longitudinal direction (Y direction) of the absorbent core 41 toward the center line CL. In addition, the second space portion 41s2 is positioned inward from the arcuate top of the first space portion 41s1, and is formed in a pair of rectangular shapes.

Moreover, as shown in FIG. 8, the space part 41s or the low basis weight part may have a first space part 41s1 and a third space part 41s3. Specifically, in the crotch region C, the first space portion 41s1 is positioned inward from both side edges along the longitudinal direction (Y direction) of the absorbent core 41, and the shape thereof is inward toward the center line CL. The third space 41s3 is located in the middle of the arcuate tops of the adjacent first spaces 41s1 and formed in a single rectangular shape. In addition, as shown in FIG. 8, the end of the back side region B side of the single rectangular third space 41s3 is the back side of each of the pair of arc-shaped first spaces 41s1, 41s1. It is arranged closer to the ventral region A than the end on the region B side.

Further, as shown in FIG. 9, the space portion 41 s or the low basis weight portion is located on both sides along the longitudinal direction (Y direction) of the absorbent core 41 from the portion near the crotch region C of the back region B to the crotch region. It may be formed in a straight line until it reaches the entire region of the ventral region A through C.

Moreover, in the disposable diaper 1 of the above-mentioned embodiment, as shown to FIG. 1, FIG. 4, the bulky area | region 9L of the surface sheet 2 is the space part 41s which the absorptive core 41 which comprises the absorber 4 has, or low-tsubo Although it is arranged at a position corresponding to the quantity part, it may not be arranged correspondingly.

Moreover, in the disposable diaper 1 of the above-mentioned embodiment, when the shape of the space part 41s or the low basic weight part which the absorptive core 41 which comprises the absorber 4 has is a shape as shown in FIG. The bulky region 9L of the sheet 2 is arranged at a position corresponding to the space portion 41s or the low basis weight portion as shown in FIGS. 1 and 4. For example, the shape of the space portion 41s or the low basis weight portion is In the case of the shape shown in FIG. 6 described above, the bulky region 9L of the topsheet 2 is similar to the shape of the pair of space portions 41s, 41s or the low basis weight portion shown in FIG. 6, as shown in FIG. In the crotch region C, it is located inward from both side edges along the longitudinal direction (Y direction) of the absorbent core 41, and the shape thereof is formed in an arc shape convex inward toward the center line CL. It may be.

In addition, for example, when the space portion 41s or the low basis weight portion has the first space portion 41s1 and the second space portion 41s2 and has the shape shown in FIG. 7 described above, the topsheet 2 on the side portions 5s and 5s. As shown in FIG. 11, the bulky region 9L includes a pair of first bulky regions 9La, 9La, and a pair of central bulky regions 9Lb, 9Lb between the pair of first bulky regions 9La, 9La. You may have. Specifically, the bulky region 9L of the topsheet 2 is similar to the shape of the two pairs of space portions 41s (first space portion 41s1 and second space portion 41s2) shown in FIG. In 5s and 5s, a pair of first bulky regions 9La and 9La are formed in an arc shape convex inward from both side edges along the longitudinal direction (Y direction) of the topsheet 2 toward the center line CL. In addition, between the pair of first bulky regions 9La and 9La, a pair of central bulky regions 9Lb and 9Lb are located inward from the tops of the arc-shaped bulky regions 9La and are rectangular in the Y direction. Is formed. In this case, as shown in FIG. 11, the pair of central bulky regions 9Lb and 9Lb have end portions on the back side region B side at the back side region B side of the pair of arc-shaped bulky regions 9La and 9La, respectively. It is arranged closer to the ventral region A than the end. The bulk region 9L of the topsheet 2 has one pair of space portions 41s and 41s (first space) of the two pairs of space portions 41s (first space portion 41s1 and second space portion 41s2) shown in FIG. It may be formed similar to the shape of the portion 41s1 or the second space portion 41s2). For example, in the two pairs of space portions 41s (first space portion 41s1 and second space portion 41s2) shown in FIG. 7, the shape is similar to the shape of the inner pair of space portions 41s and 41s (second space portion 41s2). As shown in FIG. 12, only a pair of central bulk regions 9Lb and 9Lb may be formed in a rectangular shape that is long in the Y direction.

For example, when the space 41s (the first space 41s1 and the third space 41s3) has the shape shown in FIG. 8 described above, the bulk region 9L of the topsheet 2 is as shown in FIG. A pair of first bulky regions 9La and 9La and a second central bulky region 9Lc may be provided between the pair of first bulky regions 9La and 9La. Specifically, the bulky region 9L of the topsheet 2 is similar to the shape of the three space portions 41s (first space portion 41s1 and third space portion 41s3) shown in FIG. The first bulky regions 9La and 9La are located inward from both side edges along the longitudinal direction (Y direction) of the topsheet 2, and the shape thereof is an arc shape convex inward toward the center line CL. In addition, a second central bulk region 9Lc is located between the pair of bulky regions 9La and 9La and is located inward from the top of the arc-shaped bulky region 9La and is longer in the Y direction. It may be formed in a rectangular shape. In this case, as shown in FIG. 13, the one second central bulk region 9Lc has an end on the back side region B side at the back side region B side of each of the pair of arc-shaped bulk regions 9La and 9La. It is arranged closer to the ventral region A than the end portion. Thus, when the second central bulk region 9Lc is arranged closer to the ventral region A than the pair of arc-shaped bulk regions 9La, 9La, the loose stool excreted in the dorsal region B is in the crotch region C. Can be further prevented from diffusing to the ventral region A, and leakage on the ventral side can be further prevented.

In addition, for example, when the shape of the space portion 41s or the low basis weight portion is the shape shown in FIG. 9 described above, the bulky region 9L of the topsheet 2 is a space shown in FIG. Similar to the shape of the portion 41 s or the low basis weight portion, on both sides along the longitudinal direction (Y direction) of the topsheet 2, from the portion near the crotch region C of the dorsal region B to the ventral region C through the crotch region C You may form in the shape of a straight line until it covers the whole area of A.

Moreover, in the disposable diaper 1 of the above-mentioned embodiment, as shown in FIG.2 and FIG.4, as the surface sheet 2, it is a nonwoven fabric which has the 1st layer 23 and the 2nd layer 24, Comprising: The 1st layer 23 side is skin. A bulky nonwoven fabric having a concavo-convex structure in which a large number of convex portions 21 are formed which are raised on the opposite surface side and are hollow inside and a concave portion 22 is formed between the convex portions 21 is used. Instead of the structure nonwoven fabric, a bulky nonwoven fabric having a concavo-convex structure which is a nonwoven fabric composed of two layers and has a large number of convex portions with solid inside and concave portions between the convex portions may be used. As such a nonwoven fabric, for example, a surface sheet described in JP-A No. 2002-187228 related to the previous application of the present applicant can be mentioned. Further, in place of the concavo-convex structure nonwoven fabric composed of two layers, the woven fabric is composed of a single layer, and is a bulky nonwoven fabric having a concavo-convex structure having a large number of convex portions protruding on the skin facing surface side and concave portions between the convex portions. May be used. As such a non-woven fabric, for example, a surface sheet described in JP 2012-136790 A related to the earlier application of the present applicant can be mentioned.

Moreover, in the disposable diaper 1 of the above-mentioned embodiment, as shown in FIG.2 and FIG.4, as the surface sheet 2, many convex parts 21 which protruded only on the skin opposing surface side, and concave parts between the convex parts 21 22 is used in place of the non-woven fabric having a concavo-convex structure, and in place of the concavo-convex structure non-woven fabric, a large number of convex portions protruding not only on the skin facing surface side but also on the non-skin facing surface side, and the convex portions You may use the bulky nonwoven fabric of the uneven structure which has a recessed part in between. Examples of such a concavo-convex structure of the nonwoven fabric include a ridge groove structure in which the convex portions 21 are ridges and the concave portions 22 are grooves. In addition, the convex part 21 of the collar is solid. If a nonwoven fabric having such a concave-convex structure made up of such ridges is used, loose stool excreted in the dorsal region B can easily diffuse in the longitudinal direction (Y direction), and further prevent lateral leakage from the crotch region C. it can. An example of such a non-woven fabric having a concavo-convex structure made of ridges is a surface sheet described in Japanese Patent Application Laid-Open No. 2009-153937 according to the earlier application of the present applicant.

Moreover, although the disposable diaper 1 of the above-mentioned embodiment is an unfolded disposable diaper as shown in FIG. 1, it may be a pants-type disposable diaper or a sanitary napkin.

The following absorbent articles are disclosed regarding the embodiment described above.
<1>
A longitudinally long sheet comprising a liquid-permeable surface sheet disposed on the skin facing surface side, a liquid-impermeable surface sheet disposed on the non-skin facing surface side, and an absorber disposed between the two sheets. An absorbent article having an absorbent body,
The absorbent main body is divided into a ventral region located on the wearer's ventral side when worn, a dorsal region located on the dorsal side, and a crotch region disposed between the ventral region and the dorsal region. And
The surface sheet is made of a bulky nonwoven fabric,
In the topsheet excluding the back region, on both sides along the longitudinal direction of the absorbent main body, a bulky region having a lower apparent density than a portion having the highest apparent density in the central portion of the crotch region, At least a pair of absorbent articles.
<2>
The absorbent body has an absorptive core, and the absorptive core is a low basis weight part in which the basis weight of the pulp constituting the absorbent core is relatively low, or a space without pulp constituting the absorptive core. Part
The absorbent article according to <1>, wherein the bulky region is disposed at a position corresponding to the low basis weight portion or the space portion.
<3>
The bulky region is not in the ventral region, but is disposed in the crotch region, according to <1> or <2>.
<4>
The surface sheet is any one of <1> to <3> comprising a bulky nonwoven fabric having a concavo-convex structure including at least a large number of convex portions protruding on the skin facing surface side and concave concave portions adjacent to the convex portions. The absorbent article as described.
<5>
The absorbent article according to <4>, wherein the concavo-convex structure is a ridge groove structure in which the convex portion is a ridge and the concave portion is a groove.
<6>
The absorbent article according to any one of <1> to <5>, wherein the bulky region has an apparent thickness that is higher than an apparent thickness of a portion having the highest apparent density in a central portion of the crotch region.
<7>
In plan view, one of the sides that constitutes the outline of the bulky region, the innermost side is formed in an inwardly convex arc shape, and the sides that constitute the pair of bulky regions are The absorbent article according to any one of <1> to <6>, which are opposed to each other.
<8>
The absorption according to any one of <4> to <7>, wherein the maximum width of the bulky region is larger than the width of the convex portion of the nonwoven fabric having a concavo-convex structure constituting the surface sheet in the bulky region in plan view. Sex goods.
<9>
Between the pair of bulky regions, at least one central bulky region is further arranged, and an end of the central bulky region on the back side region side is an end on the back side region side of each of the pair of bulky regions. The absorbent article according to any one of <1> to <8>, which is disposed closer to the ventral region than the portion.
<10>
The absorbent article according to <1> to <9> is a disposable diaper.
<11>
The disposable diaper is a deployable disposable diaper, and a pair of fastening tapes are provided on both left and right edges of the dorsal region, and a landing tape for fastening the fastening tape is provided on the outer surface of the ventral region. The disposable diaper according to <10>.
<12>
<10><11> The disposable diaper according to any one of <10> and <11>, wherein the liquid-impervious rear sheet is provided with an outer packaging made of a liquid-impermeable film and a non-woven fabric disposed outward.
<13>
The disposable diaper according to <12>, wherein the outer package has a constricted position, and the constricted position is in a crotch region.
<14>
<10> to <13>, wherein the absorbent body is composed of an absorbent core in which water-absorbing polymer particles are held in an aggregate of pulp fibers, and a core wrap sheet covering the absorbent core. Disposable diapers.
<15>
In each side part along the longitudinal direction of the disposable diaper, a three-dimensional gather forming sheet having an elastic member fixed in an extended state is arranged and fixed on a side part of the top sheet, thereby a pair of three-dimensional solids. The disposable diaper according to any one of <10> to <14>, wherein a gather is formed.
<16>
Leg elastic members for forming leg gathers are extended in both sides along the longitudinal direction of the disposable diaper, and the leg gathers are formed by contraction of the leg elastic members <10> to <15>. Any disposable diaper described.
<17>
The basis weight of the low basis weight part of the absorbent core is lower than other parts, and the ratio of the low basis weight part / high basis weight part is 70% or less, preferably 50% or less <10> to <16> The disposable diaper according to any one of the above.
<18>
The disposable diaper according to any one of <10> to <18>, wherein the absorbent body is formed by covering an absorbent core having a space portion formed in an inwardly convex arc shape with a core wrap sheet.
<19>
In the disposable diaper, the top sheet is provided with a pair of bulky regions, and the regions other than the pair of bulky regions are all portions having a high apparent density. The disposable diaper according to any one of <10> to <18>, wherein the density is uniform.
<20>
The disposable diaper according to any one of <10> to <18>, wherein a total area of the pair of bulky regions is 5 cm ² or more, preferably 30 cm ² or more, and 150 cm ² or less, preferably 60 cm ² or less.
<21>
The apparent density of the high apparent density portion is 0.02 g / cm ³ or more, preferably 0.03 g / cm ³ or more, and 0.1 g / cm ³ or less, preferably 0.07 g / cm ³ or less < The disposable diaper according to any one of 10> to <20>.
<22>
Apparent density of the bulky region, 0.008 g / cm ³ or higher, preferably 0.02 g / cm ³ or more and 0.05 g / cm ³ or less, preferably is 0.04 g / cm ³ or less <10> - <20> The disposable diaper according to any one of the above.
<23>
The apparent density of the bulky region is lower than the apparent density of the high apparent density portion, 0.8 times or less, preferably 0.5 times or less the apparent density of the high apparent density portion <10 The disposable diaper according to any one of> to <22>.
<24>
In the disposable diaper, the space portion of the absorbent core is formed in an arc shape protruding inward from the side edge along the longitudinal direction of the absorbent core toward the center line, and the shape of the space portion Similarly, the bulky region of the topsheet is also formed in an arc shape convex inward from the side edge along the longitudinal direction of the topsheet toward the center line, and the contour of the bulky region in plan view The one side arranged on the innermost side is formed in an inwardly convex arc shape, and the one side constituting a pair of bulky regions is opposed to each other, and the shape of the bulky region is: The disposable diaper according to any one of <10> to <23>, which is formed symmetrically with respect to the center line.
<25>
The surface sheet of the disposable diaper is made of a bulky nonwoven fabric having a concavo-convex structure including a large number of convex portions raised on the skin facing surface side and concave concave portions adjacent to the convex portions, and the top sheet is a skin facing surface. The side has a undulating structure, the non-skin facing surface side is flat, and the top sheet has a first layer and a second layer of a sheet-like material, and the first layer is a skin facing surface of the top sheet. The second layer 24 constitutes the non-skin facing surface of the topsheet, and the first layer has a number of bulges that are raised on the skin facing surface side and are hollow inside. The disposable diaper according to any one of <10> to <23>, wherein a recess is formed therebetween, the second layer is planar, and the first layer and the second layer are joined in the recess.
<26>
The first layer and the second layer are made of the same or different sheet-like material, and the sheet-like material is substantially non-stretchable. The nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, and spunlace manufactured by the card method. The disposable diaper according to <25>, which is either a nonwoven fabric or a needle punched nonwoven fabric, and the fineness of the constituent fibers is 1 dtex or more, preferably 1.5 dtex or more, and 20 dtex or less, preferably 5.6 dtex or less.
<27>
In the surface sheet of the disposable diaper, the convex portion is surrounded by a concave portion having a joint portion of 4 or 6 points, the bottom surface thereof is flat, and the convex portion is a flat rectangular parallelepiped having a rounded ridgeline as a whole or The disposable diaper according to <25> and <26>, which is a truncated cone.
<28>
In the surface sheet, the basis weight of the bulky region and the basis weight of the portion with the highest apparent density in the central portion of the crotch region are the same, and the entire surface sheet including the first layer and the second layer The basis weight of the top sheet is 15 g / m ² or more, preferably 20 g / m ² or more, and 150 g / m ² or less, preferably 60 g / m ² or less. The disposable diaper according to any one of <25> to <27>.
<29>
The apparent thickness of the bulk region of the surface sheet is 0.5 mm or more, preferably 1 mm or more, and 5 mm or less, preferably 4 mm or less, and the apparent thickness of the high apparent density portion is 0.3 mm or more, preferably The disposable diaper according to any one of <10> to <28>, which is 0.5 mm or more, preferably 3 mm or less, preferably 2 mm or less.
<30>
In the surface sheet, the apparent thickness of the bulk region is higher than the apparent thickness of the high apparent density portion, higher than the total thickness of the apparent thickness of the high apparent density portion and the absorber thickness, The disposable diaper according to any one of <10> to <29>, wherein the apparent thickness of the portion having a high apparent density is 1.2 times or more, preferably 1.6 times or more.
<31>
In the plan view of the disposable diaper, the maximum width of the bulky region is formed wider than the width of the convex portion of the nonwoven fabric of the uneven structure constituting the surface sheet in the bulky region, and the maximum width of the bulky region is 2 mm or more , Preferably 5 mm or more, and 50 mm or less, preferably 20 mm or less, and the width of the convex portion located in the bulky region is 1 mm or more, preferably 2 mm or more, and 30 mm or less, preferably 5 mm or less <10 The disposable diaper according to any one of> to <30>.
<32>
In the surface sheet of the disposable diaper, the maximum width of the bulk region is formed wider than the width of the convex portion of the nonwoven fabric of the uneven structure constituting the surface sheet in the bulk region,
The disposable diaper according to any one of <10> to <31>, which is at least twice the width of the convex portion of the nonwoven fabric, preferably at least 5 times.
<33>
In the surface sheet of the disposable diaper, the length in the longitudinal direction of the convex portion located in the bulky region is the same as the length in the longitudinal direction of the convex portion located in the region excluding the bulky region, and the length of the convex portion is The disposable diaper according to any one of <10> to <32>, which is 1 mm or more, preferably 2 mm or more, and 30 mm or less, preferably 5 mm or less.
<34>
As the absorbent core constituting the absorbent body, an aggregate of pulp fibers is used in which absorbent polymer particles are held, and the covering material constituting the absorbent body is a hydrophilic sheet, and is permeable to water. The disposable diaper according to any one of <10> to <33>, wherein a core wrap sheet made of thin paper (tissue paper) or a water-permeable nonwoven fabric is used.
<35>
The elastic member and leg elastic member for forming three-dimensional gathers are made of natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, polyethylene acrylate-ethylene copolymer of ethyl acrylate-ethylene. The disposable diaper according to any one of <10> to <34>, which uses a thread-like stretchable material.
<36>
As an adhesive used for fixing each member, a hot melt adhesive can be used. Examples of the hot melt adhesive include styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer. The disposable diaper according to any one of <10> to <35>, which is a block copolymer type hot-melt adhesive of a coalescence (SBS) and a styrene-ethylene-butylene-styrene copolymer (SEBS).
<37>
The space part or the low basis weight part of the absorbent core is located inward from both side edges along the longitudinal direction of the absorbent core in the crotch region, and the shape of the absorbent core is a circle that protrudes inward toward the center line. The disposable diaper according to any one of <10> to <36>, which is formed in an arc shape.
<38>
The space portion or the low basis weight portion of the absorbent core has a first space portion and a second space portion, and in the crotch region, the first space portion is centered from both side edges along the longitudinal direction of the absorbent core. And the second space part is located inward of the arcuate top of the first space part and is formed in a pair of rectangular shapes < The disposable diaper according to any one of 10> to <37>.
<39>
The space portion or the low basis weight portion of the absorbent core has a first space portion and a third space portion, and in the crotch region, the first space portion is inward from both side edges along the longitudinal direction of the absorbent core. And the shape thereof is formed in an arc shape convex inward toward the center line, and the third space portion is located between the arc-shaped top portions of the adjacent first space portions. It is formed in one rectangular shape, and the end portion of the back side region of the single rectangular third space portion is on the back side region side of each of the pair of arc-shaped first space portions. The disposable diaper according to any one of <10> to <36>, which is disposed closer to the ventral region than the end.
<40>
The space part or the low basis weight part of the absorbent core is straight on both sides along the longitudinal direction of the absorbent core from the part near the crotch area of the dorsal area to the whole area of the ventral area through the crotch area. The disposable diaper described in any one of <10> to <36>.
<41>
The shape of the space part or the low basis weight part of the absorbent core, the bulk region of the topsheet is arranged at a position corresponding to the space part or the low basis weight part, The bulky region of the topsheet is similar to the shape of the pair of space portions or the low basis weight portions, and is located inward from both side edges along the longitudinal direction of the absorbent core in the crotch region, and the shape is The disposable diaper according to any one of <10> to <36>, wherein the disposable diaper is formed in an arc shape convex inward toward the center line.
<42>
The space part or low basis weight part of the absorbent core has a first space part and a second space part, and the bulky areas of the topsheet on both sides are a pair of first bulky areas and the pair of first bulky parts. A pair of central bulky regions, and the bulky region of the topsheet resembles the shape of the two pairs of space portions, and a pair of first bulky regions on both sides of the crotch region Are formed in an arc shape convex inwardly toward the center line CL from both side edges along the longitudinal direction (Y direction) of the surface sheet, and a pair further between the pair of first bulky regions. The central bulky region is located inward of the top of the arc-shaped bulky region and is formed in a rectangular shape that is long in the longitudinal direction. Further, each of the pair of arc-shaped bulky regions is disposed closer to the ventral region than the end on the dorsal region side <10 ~ <36> The disposable diaper according to any one.
<43>
The space portion or the low basis weight portion of the absorbent core has a first space portion and a second space portion, and does not have a bulky region of the surface sheet on both sides, and a pair of centers corresponding to the second space portion. The disposable bulk according to any one of <10> to <36>, having a bulky region, wherein the central bulky region of the topsheet is formed in a rectangular shape long in the longitudinal direction similar to the shape of the second space portion Diapers.
<44>
The space portion or the low basis weight portion of the absorbent core includes a pair of space portions, and further includes one space portion between the pair of space portions, and in the crotch region, the pair of space portions is the length of the absorber. It is located inward from both side edges along the direction (Y direction), and its shape is formed in an arc shape protruding inward toward the center line, and one more between the pair of space portions. The central space portion is located inward of the top of the arc-shaped space portion and is formed in a rectangular shape that is long in the longitudinal direction, and the end portion on the back side region side of the one central space portion is The absorbent core is arranged closer to the ventral region than the end on the dorsal region side of each of the pair of arc-shaped spaces,
The bulky region of the topsheet is similar to the shape of the three spaces of the absorbent core, and in the crotch region, the pair of bulky regions are located inward from both side edges along the longitudinal direction of the topsheet, The shape is formed in an arc shape projecting inwardly toward the center line, and one central bulky region is located between the pair of bulky regions than the top of the arcuate bulky region. The central bulky region is located on the back side, and the end portion on the back side region side of the one central bulky region is more than the back side region end portion of each of the pair of arc-shaped bulky regions. The disposable diaper according to any one of <10> to <36>, which is also arranged near the ventral region.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the examples.

[Example 1]
Using the apparatus shown in FIG. 5, press the M size of Marys (registered trademark) smooth air-through manufactured by Kao Corporation so that the upper surface side of the top sheet faces the first roll 102 of the press roll 100, A disposable diaper of Example 1 having a pair of bulky regions 9L, 9L was produced. The shape of the pair of bulky regions 9L, 9L was formed in an arc shape convex inward from the side edge along the longitudinal direction (Y direction) of the topsheet toward the center line CL. The total area of the pair of bulky regions 9L, 9L was 30.5 cm ² . Further, the apparent density of the portion 9h having a high apparent density was 0.051 g / cm ³ , and the apparent density of the bulky region 9L was 0.027 g / cm ³ . Furthermore, the apparent thickness of the portion 9h having a high apparent density (the height of the convex portion 21 located in the portion 9h) is 0.8 mm, and the apparent thickness of the bulky region 9L (the convex portion 21 located in the bulky region 9L). The height was 1.5 mm. In addition, in FIG. 15, the surface sheet with which the product of the Merry's (trademark) smooth air through M size made from Kao Corporation is shown. The surface sheet shown in FIG. 15 has an upper layer and a lower layer made of a sheet-like material, the upper layer and the lower layer are partially bonded, the upper layer protrudes at a portion other than the bonded portion, and the inside is hollow. It is a bulky sheet having a large number of convex portions.

[Example 2]
The surface sheet is removed from the M size product of Merry's (registered trademark) smooth air-through manufactured by Kao Corporation, and the nonwoven fabric shown below is attached in place, and then pressed using the apparatus shown in FIG. And the disposable diaper of Example 2 which has a pair of bulky area | regions 9L and 9L was produced. The nonwoven fabric attached instead is the bulky sheet shown in FIG. 16, and is a sheet formed by forming a large number of convex portions on a single sheet-like material. Such a nonwoven fabric supplies a web having a basis weight of 30 g / m ² made of a core-sheath type composite fiber to a shaping device, and the web on the pedestal is projected along a protrusion on the pedestal arranged in the shaping device. It is manufactured by blowing hot air toward the web, shaping and fusing the fibers. The non-woven fabric attached instead had a thickness of 2.5 mm. Moreover, in the disposable diaper of Example 2, the total area of a pair of bulky regions 9L and 9L was 30.5 cm ² . The apparent density of the portion 9h having a high apparent density was 0.017 g / cm ³ , and the apparent density of the bulky region 9L was 0.012 g / cm ³ . Furthermore, the apparent thickness of the portion 9h having a high apparent density was 1.7 mm, and the apparent thickness of the bulky region 9L was 2.5 mm.

[Comparative Example 1]
The M size of Mary's (registered trademark) smooth air-through manufactured by Kao Corporation having the surface sheet shown in FIG. 15 was not used with the apparatus shown in FIG.

[Comparative Example 2]
As shown in FIG. 5, a roll having a first roll 102 provided with a pair of recessed concave portions 101 on the peripheral surface of the press roll 100, and having a convex portion raised over the entire circumference in the center in the width direction of the roll. In place of the M size of the Marys (registered trademark) smooth air-through manufactured by Kao Corporation having the top sheet shown in FIG. 15, the top side of the top sheet is pressed against the changed roll, The disposable diaper of the comparative example 2 with which the bulky area | region of this was distribute | arranged over the whole region of the longitudinal direction (Y direction) of both sides was produced.

[Comparative Example 3]
As shown in FIG. 5, the first roll 102 having a pair of recessed concave portions 101 of the press roll 100 on the peripheral surface is replaced with a roll having a flat entire area without the concave portions, and the surface sheet shown in FIG. 15. Disposable of Comparative Example 3 having no bulky area by pressing M area of Merry's (Registered Trademark) Air-Through Air-Through manufactured by Kao Co., Ltd. with the upper surface of the top sheet facing the changed roll. A diaper was made.

[Comparative Example 4]
The diaper in which the surface sheet of the M size product of Marys (registered trademark) smooth air-through manufactured by Kao Corporation was replaced with the nonwoven fabric shown in FIG. 16 without being pressed using the apparatus shown in FIG. It was a disposable diaper.

[Comparative Example 5]
As shown in FIG. 5, a roll having a first roll 102 provided with a pair of recessed concave portions 101 on the peripheral surface of the press roll 100, and having a convex portion raised over the entire circumference in the center in the width direction of the roll. Instead, the disposable diaper of Comparative Example 4 is pressed so that the upper surface side of the topsheet faces the changed roll, and the pair of bulky regions span the entire longitudinal direction (Y direction) of both side portions. A disposable diaper of Comparative Example 5 was prepared.

[Comparative Example 6]
As shown in FIG. 5, the first roll 102 having a pair of recessed concave portions 101 of the press roll 100 on the peripheral surface is replaced with a roll having a flat entire area having no recessed portions, and the disposable diaper of Comparative Example 4 is used. The whole area was pressed so that the upper surface side of the top sheet faced the changed roll, and a disposable diaper of Comparative Example 6 having no bulky region was produced.

[Performance evaluation]
Regarding the disposable diapers of Examples 1 and 2 and Comparative Examples 1 to 6, the stool diffusibility when worn was evaluated according to the following method. The evaluation environment was a room temperature of 23 ° C. and a humidity of 50% RH. The results are shown in Table 1 below.

[Diffusion when worn]
With respect to the disposable diapers obtained in Examples 1 and 2 and Comparative Examples 1 to 6, 10 mL of pseudo-soft stool was injected through a tube into the central part of the dorsal region on the skin facing surface side of the topsheet. The components of the artificial loose stool were bentonite 28.0 g, glycerin 14.0 g, ion-exchanged water 114.1 g, emulgen 130K 0.03% by weight aqueous solution (Kao) 14.2 g, and the viscosity was 300 mPa · s (23 ° C., vibration Type viscometer: SV-10) manufactured by A & D Co., Ltd.
After the injection, the OHP film is placed on the top sheet, and a roller having a diameter of 65 mm and a width of 65 mm is used from above the OHP film, and the roller is rolled toward the ventral region. The diffusion distance in the side region direction was measured. The measurement is shown in Table 1 by measuring three samples for each diaper and calculating the average value of the measured values.

As is clear from the results shown in Table 1, the disposable diapers of Examples 1 and 2 are more easily diffused in the longitudinal direction in the crotch region than the disposable diapers of Comparative Examples 1 to 6, and the width direction It was found that the diffusion to was suppressed. Therefore, according to the disposable diapers of Examples 1 and 2, it can be expected that the side leakage of soft stool is efficiently prevented.
On the other hand, since the disposable diaper of Comparative Examples 1 and 4 does not have a bulky region, it was found that in the crotch region, it easily diffuses not only in the longitudinal direction but also in the width direction. Moreover, since the disposable diaper of Comparative Examples 2 and 5 has a pair of bulky regions over the entire area on both sides in the longitudinal direction, diffusion to the crotch region is promoted too much and diffuses in the width direction as well. I understood that. In addition, the disposable diapers of Comparative Examples 3 and 6 do not have a bulky region, and the entire region is a portion having a high apparent density, and therefore, in the crotch region, the disposable diaper can easily diffuse not only in the longitudinal direction but also in the width direction. I understood.

According to the absorbent article of the present invention, the cushioning property at the time of wearing is good, the wetback after absorption of body fluid is small, the feeling of use is good, and the side leakage prevention property of body fluid is further improved.

Claims (44)

1. A longitudinally long sheet comprising a liquid-permeable surface sheet disposed on the skin facing surface side, a liquid-impermeable surface sheet disposed on the non-skin facing surface side, and an absorber disposed between the two sheets. An absorbent article having an absorbent body,
   The absorbent main body is divided into a ventral region located on the wearer's ventral side when worn, a dorsal region located on the dorsal side, and a crotch region disposed between the ventral region and the dorsal region. And
   The surface sheet is made of a bulky nonwoven fabric,
   In the topsheet excluding the back region, on both sides along the longitudinal direction of the absorbent main body, a bulky region having a lower apparent density than a portion having the highest apparent density in the central portion of the crotch region, At least a pair of absorbent articles.
2. The absorbent body has an absorptive core, and the absorptive core is a low basis weight part in which the basis weight of the pulp constituting the absorbent core is relatively low, or a space without pulp constituting the absorptive core. Part
   The absorbent article according to claim 1, wherein the bulky region is arranged at a position corresponding to the low basis weight portion or the space portion.
3. The absorbent article according to claim 1 or 2, wherein the bulky region is not in the ventral region but is disposed in the crotch region.
4. 4. The bulky nonwoven fabric according to claim 1, wherein the top sheet is made of a bulky nonwoven fabric having a concavo-convex structure including at least a plurality of convex portions protruding on the skin facing surface side and concave concave portions adjacent to the convex portions. The absorbent article as described.
5. The absorbent article according to claim 4, wherein the concavo-convex structure is a ridge groove structure in which the convex portion is a ridge and the concave portion is a groove.
6. The absorbent article according to any one of claims 1 to 5, wherein an apparent thickness of the bulky region is higher than an apparent thickness of a portion having a highest apparent density in a central portion of the crotch region.
7. In plan view, one of the sides that constitutes the outline of the bulky region, the innermost side is formed in an inwardly convex arc shape, and the sides that constitute the pair of bulky regions are The absorbent article according to any one of claims 1 to 6, which are opposed to each other.
8. The absorption according to any one of claims 4 to 7, wherein a maximum width of the bulky region is wider than a width of the convex portion of the nonwoven fabric having a concavo-convex structure constituting the surface sheet in the bulky region in plan view. Sex goods.
9. Between the pair of bulky regions, at least one central bulky region is further arranged, and an end of the central bulky region on the back side region side is an end on the back side region side of each of the pair of bulky regions. The absorbent article according to any one of claims 1 to 8, which is disposed closer to the ventral region than the portion.
10. The absorbent article according to any one of claims 1 to 9 is a disposable diaper.
11. The disposable diaper is a deployable disposable diaper, and a pair of fastening tapes are provided on both left and right edges of the dorsal region, and a landing tape for fastening the fastening tape is provided on the outer surface of the ventral region. The disposable diaper according to claim 10.
12. The disposable diaper according to claim 10 or 11, wherein the hardly liquid-permeable back sheet includes an envelope including a liquid hardly permeable film and a non-woven fabric disposed outward.
13. The disposable diaper according to claim 12, wherein the outer packaging body has a constricted position, and the constricted position is in a crotch region.
14. The absorbent body according to any one of claims 10 to 13, wherein the absorbent body is composed of an absorbent core in which particles of a water-absorbing polymer are held in an aggregate of pulp fibers, and a core wrap sheet that covers the absorbent core. The disposable diaper described.
15. In each side part along the longitudinal direction of the disposable diaper, a three-dimensional gather forming sheet having an elastic member fixed in an extended state is arranged and fixed on a side part of the top sheet, thereby a pair of three-dimensional solids. The disposable diaper according to any one of claims 10 to 14, wherein a gather is formed.
16. A leg gathering member for leg gather formation is disposed in an extended state on each side portion along the longitudinal direction of the disposable diaper, and the leg gather is formed by contraction of the leg resilient member. The disposable diaper of Claim 1.
17. The basis weight of the low basis weight part of the absorbent core is lower than other parts, and the ratio of the low basis weight part / high basis weight part is 70% or less. Disposable diapers described in 1.
18. The disposable diaper according to any one of claims 10 to 18, wherein the absorbent body is formed by covering an absorbent core having a space portion formed in an inwardly convex arc shape with a core wrap sheet. .
19. In the disposable diaper, the top sheet is provided with a pair of bulky regions, and the regions other than the pair of bulky regions are all portions having a high apparent density. The disposable diaper according to any one of claims 10 to 18, wherein the density thereof is uniform.
20. The disposable diaper according to any one of claims 10 to 18, wherein a total area of the pair of bulky regions is 5 cm ² or more and 150 cm ² or less.
21. The disposable diaper according to any one of claims 10 to 20, wherein the apparent density of the high apparent density portion is 0.02 g / cm ³ or more and 0.1 g / cm ³ or less.
22. The apparent density of the bulky region, disposable diaper according to any one of claims 10-20 or less 0.008 g / cm ³ or more 0.05 g / cm ^3.
23. The apparent density of the bulky region is lower than the apparent density of the portion with the high apparent density, and is not more than 0.8 times the apparent density of the portion with the high apparent density. Disposable diapers.
24. In the disposable diaper, the space portion of the absorbent core is formed in an arc shape protruding inward from the side edge along the longitudinal direction of the absorbent core toward the center line, and the shape of the space portion Similarly, the bulky region of the topsheet is also formed in an arc shape convex inward from the side edge along the longitudinal direction of the topsheet toward the center line, and the contour of the bulky region in plan view The one side arranged on the innermost side is formed in an inwardly convex arc shape, and the one side constituting a pair of bulky regions is opposed to each other, and the shape of the bulky region is: The disposable diaper according to any one of claims 10 to 23, which is formed symmetrically with respect to the center line.
25. The surface sheet of the disposable diaper is made of a bulky nonwoven fabric having a concavo-convex structure including a large number of convex portions raised on the skin facing surface side and concave concave portions adjacent to the convex portions, and the top sheet is a skin facing surface. The side has a undulating structure, the non-skin facing surface side is flat, and the top sheet has a first layer and a second layer of a sheet-like material, and the first layer is a skin facing surface of the top sheet. The second layer 24 constitutes the non-skin facing surface of the topsheet, and the first layer has a number of bulges that are raised on the skin facing surface side and are hollow inside. The disposable diaper according to any one of claims 10 to 23, wherein a recess is formed therebetween, the second layer is planar, and the first layer and the second layer are joined in the recess. .
26. The first layer and the second layer are made of the same or different sheet-like material, and the sheet-like material is substantially non-stretchable. The nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, and spunlace manufactured by the card method. The disposable diaper according to claim 25, wherein the disposable diaper is any one of a nonwoven fabric and a needle punched nonwoven fabric, and the fineness of the constituent fibers is 1 dtex or more and 20 dtex or less.
27. In the surface sheet of the disposable diaper, the convex portion is surrounded by a concave portion having a joint portion of 4 or 6 points, the bottom surface thereof is flat, and the convex portion is a flat rectangular parallelepiped having a rounded ridgeline as a whole or 27. The disposable diaper according to claim 25 or 26, wherein the disposable diaper is a truncated cone.
28. In the surface sheet, the basis weight of the bulky region and the basis weight of the portion with the highest apparent density in the central portion of the crotch region are the same, and the entire surface sheet including the first layer and the second layer The disposable diaper according to any one of claims 25 to 27, wherein the basis weight of the surface sheet is uniform, and the overall basis weight of the topsheet is 15 g / m ² or more and 150 g / m ² or less.
29. The apparent thickness of the bulk region of the top sheet is 0.5 mm or more and 5 mm or less, and the apparent thickness of the portion with the high apparent density is 0.3 mm or more and 3 mm or less. The disposable diaper described.
30. In the surface sheet, the apparent thickness of the bulk region is higher than the apparent thickness of the high apparent density portion, higher than the total thickness of the apparent thickness of the high apparent density portion and the absorber thickness, The disposable diaper according to any one of claims 10 to 29, wherein the disposable diaper is 1.2 times or more of an apparent thickness of a portion having a high apparent density.
31. In the plan view of the disposable diaper, the maximum width of the bulky region is formed wider than the width of the convex portion of the nonwoven fabric of the uneven structure constituting the surface sheet in the bulky region, and the maximum width of the bulky region is 2 mm or more The disposable diaper according to any one of claims 10 to 30, wherein the width of the convex portion located in the bulky region is 1 mm or more and 30 mm or less.
32. In the surface sheet of the disposable diaper, the maximum width of the bulk region is formed wider than the width of the convex portion of the nonwoven fabric of the uneven structure constituting the surface sheet in the bulk region,
    The disposable diaper according to any one of claims 10 to 31, wherein the disposable diaper is at least twice the width of the convex portion of the nonwoven fabric.
33. In the surface sheet of the disposable diaper, the length in the longitudinal direction of the convex portion located in the bulky region is the same as the length in the longitudinal direction of the convex portion located in the region excluding the bulky region, and the length of the convex portion is The disposable diaper according to any one of claims 10 to 32, which is 1 mm or more and 30 mm or less.
34. As the absorbent core constituting the absorbent body, an aggregate of pulp fibers is used in which absorbent polymer particles are held, and the covering material constituting the absorbent body is a hydrophilic sheet, and is permeable to water. The disposable diaper according to any one of claims 10 to 33, wherein a core wrap sheet made of thin paper (tissue paper) or a water-permeable nonwoven fabric is used.
35. The elastic member and leg elastic member for forming three-dimensional gathers are made of natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, polyethylene acrylate-ethylene copolymer of ethyl acrylate-ethylene. The disposable diaper according to any one of claims 10 to 34, wherein a thread-like stretchable material is used.
36. As an adhesive used for fixing each member, a hot melt adhesive can be used. Examples of the hot melt adhesive include styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer. The disposable diaper according to any one of claims 10 to 35, which is a block-copolymer type hot-melt adhesive of a combination (SBS) and a styrene-ethylene-butylene-styrene copolymer (SEBS).
37. The space part or the low basis weight part of the absorbent core is located inward from both side edges along the longitudinal direction of the absorbent core in the crotch region, and the shape of the absorbent core is a circle that protrudes inward toward the center line. The disposable diaper according to any one of claims 10 to 36, wherein the disposable diaper is formed in an arc shape.
38. The space portion or the low basis weight portion of the absorbent core has a first space portion and a second space portion, and in the crotch region, the first space portion is centered from both side edges along the longitudinal direction of the absorbent core. And the second space part is located inward of the arcuate top of the first space part and is formed in a pair of rectangular shapes. Item 37. The disposable diaper according to any one of Items 10 to 37.
39. The space portion or the low basis weight portion of the absorbent core has a first space portion and a third space portion, and in the crotch region, the first space portion is inward from both side edges along the longitudinal direction of the absorbent core. And the shape thereof is formed in an arc shape convex inward toward the center line, and the third space portion is located between the arc-shaped top portions of the adjacent first space portions. It is formed in one rectangular shape, and the end portion of the back side region of the single rectangular third space portion is on the back side region side of each of the pair of arc-shaped first space portions. The disposable diaper according to any one of claims 10 to 36, wherein the disposable diaper is arranged closer to the ventral region than the end.
40. The space part or the low basis weight part of the absorbent core is straight on both sides along the longitudinal direction of the absorbent core from the part near the crotch area of the dorsal area to the whole area of the ventral area through the crotch area. The disposable diaper according to any one of claims 10 to 36, wherein the disposable diaper is formed as described above.
41. The shape of the space part or the low basis weight part of the absorbent core, the bulk region of the topsheet is arranged at a position corresponding to the space part or the low basis weight part, The bulky region of the topsheet is similar to the shape of the pair of space portions or the low basis weight portions, and is located inward from both side edges along the longitudinal direction of the absorbent core in the crotch region, and the shape is The disposable diaper according to any one of claims 10 to 36, wherein the disposable diaper is formed in an arc shape convex inward toward the center line.
42. The space part or low basis weight part of the absorbent core has a first space part and a second space part, and the bulky areas of the topsheet on both sides are a pair of first bulky areas and the pair of first bulky parts. A pair of central bulky regions, and the bulky region of the topsheet resembles the shape of the two pairs of space portions, and a pair of first bulky regions on both sides of the crotch region Are formed in an arc shape convex inwardly toward the center line CL from both side edges along the longitudinal direction (Y direction) of the surface sheet, and a pair further between the pair of first bulky regions. The central bulky region is located inward of the top of the arc-shaped bulky region and is formed in a rectangular shape that is long in the longitudinal direction. The pair of arcuate bulky regions are arranged closer to the ventral region than the end portions on the dorsal region side The disposable diaper according to any one of 10-36.
43. The space portion or the low basis weight portion of the absorbent core has a first space portion and a second space portion, and does not have a bulky region of the surface sheet on both sides, and a pair of centers corresponding to the second space portion. The bulky region has a bulky region, and the central bulky region of the topsheet is formed in a rectangular shape that is long in the longitudinal direction, similar to the shape of the second space portion. Disposable diapers.
44. The space portion or the low basis weight portion of the absorbent core includes a pair of space portions, and further includes one space portion between the pair of space portions, and in the crotch region, the pair of space portions is the length of the absorber. It is located inward from both side edges along the direction (Y direction), and its shape is formed in an arc shape protruding inward toward the center line, and one more between the pair of space portions. The central space portion is located inward of the top of the arc-shaped space portion and is formed in a rectangular shape that is long in the longitudinal direction, and the end portion on the back side region side of the one central space portion is The absorbent core is arranged closer to the ventral region than the end on the dorsal region side of each of the pair of arc-shaped spaces,
    The bulky region of the topsheet is similar to the shape of the three spaces of the absorbent core, and in the crotch region, the pair of bulky regions are located inward from both side edges along the longitudinal direction of the topsheet, The shape is formed in an arc shape projecting inwardly toward the center line, and one central bulky region is located between the pair of bulky regions than the top of the arcuate bulky region. The central bulky region is located on the back side, and the end portion on the back side region side of the one central bulky region is more than the back side region end portion of each of the pair of arc-shaped bulky regions. The disposable diaper according to any one of claims 10 to 36, which is also arranged near the ventral region.

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