CN205672142U - Absorbent commodity and disposable diaper - Google Patents

Abstract

The utility model provides an absorbent article and a disposable diaper. A diaper (1) has a vertically long absorbent body (5) including a front sheet (2), a back sheet (3), and an absorbent body (4) disposed between the two sheets (2, 3). The absorbent main body (5) is divided into an abdominal region (A), a back region (B) and a crotch region (C). The front sheet (2) comprises a fluffy non-woven fabric. On the front sheet (2) except the backside region (B), at least one pair of apparent density The bulky region (9L) of the part (9h) with the highest apparent density in the center part (5m) of the crotch region (C) below.

Description

Absorbent articles and disposable diapers

technical field

The utility model relates to absorbent articles such as disposable diapers.

Background technique

Conventionally, there are known absorbent articles having a surface sheet with a concavo-convex structure in order to prevent leakage of bodily fluids such as soft stools and menstrual blood.

For example, Patent Document 1 describes a disposable diaper having a front sheet in which a plurality of first protrusions are provided on the skin-facing surface arranged in the central region of the central portion extending in the longitudinal direction, and A plurality of second protrusions higher in height than the first protrusions are provided on the skin-facing surfaces of the pair of side areas on the left and right sides of the area. In the disposable diaper described in Patent Document 1, since the front sheet has a plurality of convex parts, the cushioning property when worn is good, and for example, there is little rewet after absorbing soft stools, and the usability is good. In addition, in the disposable diaper described in Patent Document 1, in the crotch region, the height of the plurality of second protrusions provided in the pair of side regions is higher than the height of the plurality of first protrusions provided in the central region. , such as excellent side leakage prevention performance of soft stools.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2009-148445

Utility model content

However, in the disposable diaper described in Patent Document 1, the plurality of second protrusions respectively provided in a pair of side regions are arranged in series in the entire area in the longitudinal direction of the diaper, and the protrusion row formed by the diaper width direction has There are multiple columns formed above. That is, in the disposable diaper described in patent document 1, a some 2nd convex part is provided in the longitudinal direction whole area|region from the back side area|region of each pair of side part area|region to the abdominal side area|region. Since the second convex portion is provided in this way, for example, soft stool excreted in the back area is difficult to spread in the width direction in the back area, and a large amount of soft stool easily spreads to the crotch area through the central area. When such a large amount of soft stools diffuses to the crotch region and exceeds the absorption capacity of the crotch region, side leakage of soft stools cannot be prevented, and there is a need to further improve the side leakage prevention.

Therefore, the present invention provides an absorbent article that can satisfy the above-mentioned needs.

The utility model provides an absorbent article, which comprises a longitudinally long absorbent main body, the absorbent main body has a liquid-permeable front sheet arranged on the side facing the skin, and a liquid-impermeable front sheet arranged on the side not facing the skin. A transient back sheet and an absorbent body arranged between the two sheets. The absorbent main body is divided into an abdominal region located on the abdominal side of the wearer when worn, a dorsal region located on the back side, and a crotch region arranged between the abdominal region and the dorsal region. The front sheet includes a fluffy non-woven fabric, and on the front sheet except the backside region, at least a pair of fluffy regions are arranged on both sides of the above-mentioned absorbent main body in the longitudinal direction, and at least one pair of fluffy regions are arranged on the sides of the crotch region. The apparent density of the fluffy region is lower than that of the part with the highest apparent density in the central part.

Description of drawings

Fig. 1 is a partially cutaway plan view of an unfolded disposable diaper according to an embodiment of the present invention seen from the front sheet side.

Fig. 2 is an I-I sectional view of Fig. 1 .

Fig. 3 is a plan view of an absorbent core constituting an absorbent body included in the disposable diaper shown in Fig. 1 .

Fig. 4 is a plan view of a top sheet included in the disposable diaper shown in Fig. 1 .

Fig. 5 is a schematic diagram showing an example of a press roll used when manufacturing an unfolded disposable diaper according to an embodiment of the present invention.

Fig. 6 is a plan view of an absorptive core used in a disposable diaper which is another embodiment of the present invention (a figure corresponding to Fig. 3 ).

Fig. 7 is a plan view of an absorptive core used in a disposable diaper which is another embodiment of the present invention (a figure corresponding to Fig. 3 ).

Fig. 8 is a plan view of an absorptive core used in a disposable diaper which is another embodiment of the present invention (a figure corresponding to Fig. 3 ).

Fig. 9 is a plan view of an absorptive core used in a disposable diaper which is another embodiment of the present invention (a figure corresponding to Fig. 3 ).

Fig. 10 is a plan view of a topsheet used in a disposable diaper having the absorbent core shown in Fig. 6 as another embodiment of the present invention (a view corresponding to Fig. 4 ).

Fig. 11 is a plan view of a topsheet used in a disposable diaper having an absorptive core shown in Fig. 7 as another embodiment of the present invention (figure corresponding to Fig. 4 ).

Fig. 12 is a plan view of another topsheet used in a disposable diaper having an absorptive core shown in Fig. 7 as another embodiment of the present invention (a figure corresponding to Fig. 4 ).

Fig. 13 is a plan view of a topsheet used in a disposable diaper having an absorptive core shown in Fig. 8 as another embodiment of the present invention (figure corresponding to Fig. 4 ).

Fig. 14 is a plan view of a topsheet used in a disposable diaper having an absorptive core shown in Fig. 9 as another embodiment of the present invention (figure corresponding to Fig. 4 ).

Fig. 15 is a perspective view of a top sheet included in a disposable diaper used when producing the disposable diapers of Example 1 and Comparative Examples 1-3.

Fig. 16 is a perspective view of a top sheet included in a disposable diaper used when producing the disposable diapers of Example 2 and Comparative Examples 4 to 6.

detailed description

Hereinafter, the absorbent article of this invention is demonstrated based on the preferable embodiment, referring FIGS. 1-4. FIG. 1 shows a partially cutaway plan view of an unfolded disposable diaper according to an embodiment of the present invention viewed from the front sheet side, and FIG. 2 shows an I-I sectional view of FIG. 1 . Moreover, the top view of the absorptive core of the absorber which the disposable diaper shown in FIG. 1 has is shown in FIG. 3, and the top surface sheet which the disposable diaper shown in FIG. 1 has is shown in FIG.

As shown in FIG. 1 , a disposable diaper 1 (hereinafter also referred to as "diaper 1") of this embodiment includes a longitudinally long absorbent body 5 having a liquid-permeable body disposed on the side facing the skin. A non-skin-opposing topsheet 2, a liquid-impermeable backsheet 3 disposed on the non-skin-facing side, and an absorbent body 4 disposed between the two sheets 2, 3. The absorbent main body 5 is divided into an abdominal region A positioned on the abdomen side of the wearer, a back region B positioned on the back side, and a crotch region C disposed between the abdomen region A and the back region B when worn. As shown in FIG. 1, the diaper 1 is formed bilaterally symmetrically about the center line CL extended in the longitudinal direction.

In the present invention, in the unfolded state of the diaper, the diapers are classified into the following 1) to 3), and the abdominal region A, the back region B, and the crotch region C are judged. Specifically, in the diaper of the present embodiment, in the state where the diaper is unfolded (FIG. 1), 1) the crotch region C corresponds to the narrowed position (retracted position) of the outer cover, and The region located on the abdomen side of the wearer from the crotch region C is referred to as the abdomen region A, and the region located on the back side of the wearer from the crotch region C is referred to as the back region B. The narrowed position refers to a region where the outer casing shrinks from both sides along the Y direction described below to the center in the width direction (X direction described below), and the width of the outer casing becomes narrower. This region is referred to as the crotch region C. The outer cover mentioned here refers to the outermost sheet arranged on the non-skin side of the diaper, and generally refers to the nonwoven fabric arranged outside the liquid impermeable film sheet. When the fabric is spun and has only a liquid-impermeable membrane, the membrane is regarded as an outer casing. The membrane is the same size as the non-woven fabric or the non-woven fabric used as the outer covering is slightly larger than several millimeters. In addition, in the abdominal region A and the back region B, the outer cover protrudes in the width direction than the crotch region C and has a wider width. Or, 2) In the case of a diaper in which the side portion of the outer body is linearly formed in the longitudinal direction (Y direction), and fins for fixing are provided on both sides of the back side, the region including the fins is defined as the back side. In the region B, the portion on the ventral side corresponding to the length of the flap, that is, the portion where the flap overlaps when worn is defined as the ventral region A, and the area between the back region B and the ventral region A is defined as the crotch region C. . Or, 3) In the case of a diaper in which the region cannot be distinguished from the descriptions in 1) and 2) above, the abdomen of the wearer when the diaper is divided into three equal parts in the longitudinal direction in the state where the diaper is unfolded is defined as the abdomen region A, Let the back side be the back side region B, and let the crotch part side between the abdomen side and the back side be the crotch part region C.

Describe the diaper 1 in detail. As shown in FIG. 1, the absorbent body 5 of the diaper 1 has a longitudinal direction (hereinafter also referred to as "Y direction", Y direction: a direction parallel to the center line CL) in a stretched state. Abdominal region A, crotch region C and back region B. With regard to the abdominal region A, the crotch region C, and the back region B, in the state where the diaper 1 is stretched, the region corresponding to the narrowed position of the outer cover is defined as the crotch region C, and the region located at a lower position than the crotch region is defined as the crotch region C. The region closer to the wearer's abdomen is referred to as the abdominal region A, and the region located on the wearer's back side than the crotch region is referred to as the back region B (to correspond to the diapers classified in (1) above). Moreover, the direction orthogonal to a longitudinal direction (Y direction) is demonstrated as the width direction (henceforth "X direction") of the diaper 1. In addition, in this specification, the so-called "skin-facing surface" refers to the surface that is arranged on the wearer's skin side when wearing, among the front and back surfaces of each member such as the front sheet 2 constituting the diaper 1, and the so-called "non-skin-facing surface" The term refers to the surface facing the side opposite to the wearer's skin side when worn, among the front and back surfaces of each member such as the front sheet 2 .

As shown in FIG. 1, in the diaper 1, the left and right side edges of the abdominal region A and the left and right side edges of the back side region B are further outward in the width direction (X direction) than the left and right side edges of the crotch region C. stretch out. In addition, the left and right side edges of the crotch region C are arcuately curved inward in the width direction (X direction), and have a shape in which the central part in the longitudinal direction (Y direction) narrows inward as a whole.

In the diaper 1, as shown in FIG. 1 , the front sheet 2 and the back sheet 3 extend outward from the left and right side edges and the front and rear end edges of the absorber 4 long in the longitudinal direction (Y direction), respectively. As shown in Figure 1, the size of the longitudinal direction (Y direction) of the front sheet 2 is the same as the size of the longitudinal direction (Y direction) of the back sheet 3, but as shown in Figure 2, the size of its width direction (X direction) is smaller than The dimension of the width direction (X direction) of the back sheet 3. The topsheet 2 and the backsheet 3 are joined to each other directly or through other members at extensions extending outward from the peripheral edge of the absorber 4 to sandwich and fix the absorber 4 . The absorbent body 4 includes: an absorbent core 41 formed by holding particles of a water-absorbent polymer in an aggregate of fibers such as pulp fibers; and a wrapping core 42 that covers the absorbent core 41 . The absorptive core 41 and the topsheet 2 of the absorber 4 are described in detail below.

As shown in Fig. 1 and Fig. 2, in each of the two side parts along the longitudinal direction (Y direction) of the diaper 1, there is a sheet for forming three-dimensional gathers with an elastic member 61 fixed in a stretched state in the Y direction. 62 is arrange|positioned and fixed to the side part of the surface sheet 2, and a pair of three-dimensional gathers 6, 6 is formed by this (refer FIG. 2). In addition, as shown in FIG. 1 and FIG. 2, in each of the both sides in the longitudinal direction (Y direction) of the diaper 1, the leg elastic members 63 for forming leg gathers are stretched in the Y direction. It is configured that leg gathers are formed by contraction of the leg elastic members 63 . In addition, although not shown, a waist elastic member for forming waist gathers may be arranged in a stretched state in the X direction at the end in the longitudinal direction (Y direction) on the back side region B side of the diaper 1. The contraction of the waist elastics creates a waist gather.

As mentioned above, the diaper 1 is a so-called unfolded diaper. As shown in FIG. The non-skin-facing surface) is provided with a strap 8 that makes the buckle straps 7, 7 fixed.

In this embodiment, the absorber 4 has the absorptive core 41, and as shown in FIG.1, FIG.3, the absorptive core 41 has the space part 41s which does not exist the pulp which comprises this absorptive core 41. The space portion 41s of the absorptive core 41 included in the diaper 1 passes through the crotch region C in an arc that protrudes inward from both side edges of the absorptive core 41 in the longitudinal direction (Y direction) toward the center line CL. Formed by removing pulp. In addition, the absorptive core 41 included in the diaper 1 has the space portion 41s formed by removing the pulp, but instead of the space portion 41s, it may have a relatively low basis weight (mass per unit area) of the pulp in which some pulp is laminated. Low grammage. When there is a low basic weight part, the lower the basic weight of the low basic weight part compared with other parts, the better. Specifically, when the ratio of the low basic weight part to the high basic weight part is 70% or less, it is more preferable When it is 50% or less, a sufficiently satisfactory effect can be obtained. The absorber 4 included in the diaper 1 is formed by wrapping the absorptive core 41 having the arc-shaped space portion 41 s formed so as to protrude inward with the one-pack sheet 42 .

The topsheet 2 will be described in detail below. The front sheet 2 comprises a fluffy nonwoven fabric. Moreover, in the front sheet 2 except the back side area B, as shown in FIG. 1 and FIG. The bulky region 9L having an apparent density lower than the portion 9h having the highest apparent density in the central portion 5m of the crotch region C. In the diaper 1 of the present embodiment, as shown in FIG. 1 , the bulky region 9L is arranged not only in the region excluding the back region B but also in the abdomen region A, and is arranged in the crotch region C. The central portion 5m is a portion including the centerline CL and extending along the centerline CL in a state where the diaper 1 is stretched (length in the X direction) is about 70 mm, and the side portions 5s and 5s are the portions on the diaper 1. Among the narrowest parts in the width direction (X direction) of the crotch region C, the part located on the outside of the width direction (X direction) than the central part 5m. The side portions 5s, 5s and the central portion 5m are respectively provided in the abdominal region A to the back region B of the absorbent main body 5, that is, in the entire region in the longitudinal direction (Y direction). The portion 9h with the highest apparent density is only required to be within the region T of the central portion 5m of the crotch region C, and as described below, a portion in the range of 4 cm ² is cut out for judgment. The determination of the apparent density is described in detail below.

＜Measurement method of apparent density＞

About 9 h of the part with the highest apparent density, first cut from the region T of the central part 5 m of the crotch region C of the front sheet 2 in the thickness direction, and cut out a part in the range of 4 cm ² . The parts cut out from the region T of the top sheet 2 are the central part in the region T of the top sheet 2 , the part of the back side region B in the region T, and the part of the ventral region A in the region T. Then, using a KEYENCE (Co., Ltd.) VHX-1000 digital microscope, each apparent thickness was measured on the cut surface of each cut-out part at a magnification of 20 to 100 times and in an unloaded state. Then, each apparent density was measured by dividing the grammage of each cut out portion by each measured apparent thickness. Then, the median value of the apparent density of the central part in the region T of the front sheet 2, the apparent density of the part of the backside region B in the region T, and the apparent density of the part of the ventral region A in the region T The highest portion is the 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 central part in the region T of the front sheet 2, the part of the back side region B in the region T, and the part of the ventral region A in the region T, their average The value is set to the apparent density of the portion 9h having the highest apparent density.

Regarding the apparent density of the bulky region 9L, a portion in the range of 4 cm ² was cut out from the bulky region 9L by cutting in the thickness direction, and the apparent density was measured in the same manner as the above-mentioned portion 9h with a high apparent density.

A pair of bulky regions 9L, 9L are arranged on the front sheet 2 of the diaper 1, and all regions other than the pair of bulky regions 9L, 9L are parts 9h with high apparent density. Its density is uniform. The total area of the pair of bulky regions 9L, 9L is preferably 5 cm ² or more, more preferably 30 cm ² or more, and preferably 150 cm ² or less, further preferably 60 cm ² or less, more specifically, 5 cm ² or more and 150 cm ² or less, more preferably 30 cm ² or more and 60 cm ² or less.

The apparent density of the portion 9h having a relatively high apparent density 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, and more preferably 0.07 g/cm 3 or more. ³ or less, more specifically, preferably 0.02 g/cm ³ to 0.1 g/cm ³ , more preferably 0.03 g/cm ³ to 0.07 g/cm ³ .

The bulky region 9L has an apparent density of 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, further preferably 0.04 g/cm ³ or less, more specifically In other words, it is preferably 0.008 g/cm ³ to 0.05 g/cm ³ , more preferably 0.02 g/cm ³ to 0.04 g/cm ³ .

From the viewpoint of preventing side leakage, the apparent density of the fluffy region 9L is lower than the apparent density of the portion 9h having a higher apparent density, preferably 0.8 times the apparent density of the portion 9h having a higher apparent density. or less, more preferably 0.5 times or less.

In this embodiment, 9 L of bulky regions are arrange|positioned at the position corresponding to 41 s of space parts which the absorptive core 41 which comprises the absorber 4 has, or a low basic weight part. Specifically, when the diaper 1 is planarly viewed as shown in FIG. 1 , the bulky region 9L having a shape similar to the outline is arranged within the range of each outline of the space portions 41 s and 41 s on both sides of the absorptive core 41 . In the diaper 1, a pair of bulky area|region 9L, 9L is arrange|positioned correspondingly to a pair of space part 41s, 41s. That is, the space portion 41s of the absorptive core 41 is formed in an arc shape protruding inward from the side edge of the absorptive core 41 along the longitudinal direction (Y direction) toward the center line CL, similar to the shape of the space portion 41s. Accordingly, the bulky region 9L of the top sheet 2 is also formed in an arc shape protruding inward from the side edge along the longitudinal direction (Y direction) of the top sheet 2 toward the center line CL.

In the diaper 1, when viewed in plan as shown in FIG. 1 , the side 90 disposed on the innermost side among the sides constituting the outline of the bulky region 9L is formed in an arc shape protruding inward, and the side 90 constituting the pair of bulky regions 9L, 9L , 90 relative to each other. That is, the shape of a pair of bulky area|region 9L, 9L of the diaper 1 is formed in bilateral symmetry with respect to the center line CL.

As shown in FIGS. 2 and 4 , the front sheet 2 of the diaper 1 includes a fluffy nonwoven fabric having a plurality of protrusions 21 that protrude toward the skin-opposite side and adjacent to the protrusions 21 . The concavo-convex configuration of the depressed recess 22 . In the front sheet 2, the skin-facing side has an undulating structure, and the non-skin-facing side is flat. The front sheet 2 of the diaper 1 has the 1st layer 23 and the 2nd layer 24 of a sheet. The first layer 23 constitutes the skin facing surface of the top sheet 2 , and the second layer 24 constitutes the non-skin facing surface of the top sheet 2 . The first layer 23 is formed with a plurality of protrusions 21 that protrude toward the skin facing side and have a cavity inside, and recesses 22 are formed between the protrusions 21 . In addition, the second layer 24 is planar. Moreover, in the recessed part 22, the 1st layer 23 and the 2nd layer 24 are joined via the joining part (not shown). In the concave portion 22, there are a joint portion (not shown) and a non-joint portion surrounding the entire circumference of the joint portion (not shown).

The first layer 23 and the second layer 24 are composed of the same or different sheets. The flap is substantially non-stretchable. As a material of a sheet|seat, if it is a substantially non-stretchable material among the materials used for conventionally known diapers, it can use without limitation in particular. For example, various nonwoven fabrics such as a nonwoven fabric produced by a carding method, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunlace nonwoven fabric, and a needle punched nonwoven fabric can be mentioned. In addition, a film or the like that allows liquid to pass through the opening member may also be used. When using a non-woven fabric as a sheet, the fineness of its constituent fibers is more than 1dtex, preferably more than 1.5dtex, and less than 20dtex, preferably less than 5.6dtex, more specifically, more than 1dtex and less than 20dtex, to ensure In terms of the strength of the top sheet 2 and the enhancement of the skin feel, it is particularly preferable that it is not less than 1.5 dtex and not more than 5.6 dtex.

In the top sheet 2 of the diaper 1, as shown in FIG. 4, the convex part 21 is surrounded by the recessed part 22 containing four junction parts (not shown), and the bottom surface is rectangular in planar view. In addition, the convex portion 21 is formed as a whole into a flat rectangular parallelepiped or a truncated quadrangular pyramid with curved ridgelines. On the other hand, the concave portion 22 is also rectangular in plan view. In addition, in the front sheet 2 of the diaper 1, the convex portion 21 is surrounded by four junctions (not shown) (recesses 22), but may be surrounded by more than four junctions (not shown) (recesses 22). Specifically, the convex portion is surrounded by six concave portions (not shown) including engaging portions (not shown). In addition, the convex portion is formed as a flat rectangular parallelepiped or truncated cone with curved ridgelines as a whole.

In the front sheet 2 of the diaper 1, as shown in FIG. 4 , rows of convex portions 21 and concave portions 22 alternately arranged along the longitudinal direction (Y direction) are formed, and the rows are arranged in a plurality of rows in the width direction (X direction). When focusing on any one of the protrusions 21 in one of the above rows, there is no protrusion 21 at a position adjacent to the one of the protrusions 21 in the left and right rows adjacent to the row in the width direction (X direction). . That is, in two columns adjacent to each other in the width direction (X direction), the joining portions (not shown) (recesses 22 ) are arranged shifted by half a pitch in the longitudinal direction (Y direction). Therefore, when paying attention to any one joint portion (not shown) (recess 22 ) in a row, the one joint portion (not shown) (recess 22 ) becomes a closed structure formed by being surrounded by protrusions 21 in front, rear and left and right. Depression. That is, when the top sheet 2 is planarly viewed from the side of the first layer 23, the junction part (not shown) (recessed part 22) is arrange|positioned in zigzag grid form, and the convex part 21 is also arrange|positioned in zigzag grid form.

In the front sheet 2 of the diaper 1, the basic weight of the bulky region 9L is the same as the basic weight of the part 9h having the highest apparent density in the central part 5m of the crotch region C, including the front of the first layer 23 and the second layer 24. The entire grammage of the sheet 2 was uniform. The overall grammage of the front sheet 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, further preferably 60 g/m ² or less, more specifically, preferably It is 15 g/m ² to 150 g/m ² , more preferably 20 g/m ² to 60 g/m ² .

The apparent thickness of the bulky region 9L is specifically the height of the convex portion 21 located in the bulky region 9L in the front sheet 2 of the diaper 1, and the apparent thickness of the portion 9h higher than the highest apparent density is specifically the front surface of the diaper 1. The height of the convex part 21 located in the area|region other than 9 L of bulky areas in the sheet|seat 2. In addition, the apparent thickness is measured by the measuring method used in the measuring method of the said apparent density.

The apparent thickness of the bulky region 9L is preferably not less than 0.5 mm, more preferably not less than 1 mm, and preferably not more than 5 mm, more preferably not more than 4 mm, more specifically, not less than 0.5 mm and not more than 5 mm, and more preferably not less than 1 mm. Below 4mm.

The apparent thickness of the portion 9 h 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 more. At most, it is more preferably at least 0.5 mm and at most 2 mm.

In the front sheet 2 of the diaper 1, the apparent thickness of the bulky region 9L is higher than the apparent thickness of the above-mentioned portion 9h with a higher apparent density, and is preferably higher than the above-mentioned apparent thickness from the viewpoint of further improvement of side leakage prevention. The total thickness of the apparent thickness of the portion 9h having a relatively high apparent density and the thickness of the absorber 4 is preferably 1.2 times or more, more preferably 1.6 times or more, the apparent thickness of the portion 9h having a relatively high apparent density.

Moreover, when the diaper 1 is planarly viewed as shown in FIG. 1, the maximum width W1 of 9 L of bulky regions is formed larger than the width W2 of the convex part 21 of the nonwoven fabric which comprises the concavo-convex structure of the surface sheet 2 in this bulky region 9L. In addition, the width W2 of the convex part 21 shows the dimension along the X direction of the bottom part of the convex part 21.

The maximum width W1 of the bulky region 9L is preferably not less than 2 mm, more preferably not less than 5 mm, and preferably not more than 50 mm, more preferably not more than 20 mm, more specifically, not less than 2 mm and not more than 50 mm, and still more preferably not less than 5 mm and not more than 20 mm. .

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, preferably 1 mm or more and 30 mm or less, and more preferably More than 2mm and less than 5mm. Moreover, in the top sheet 2 of the diaper 1, the width|variety of the convex part 21 located in the area|region other than 9 L of bulky areas is the same as the width W2 of the convex part 21 located in this bulky area|region 9L.

As described above, in the front sheet 2 of the diaper 1, the maximum width W1 of the bulky region 9L is formed larger than the width W2 of the convex portion 21 of the nonwoven fabric constituting the uneven structure of the front sheet 2 in the bulky region 9L. From the viewpoint of further improvement of leakage prevention, it is preferably 2 times or more, more preferably 5 times or more, the width W2 of the convex portion 21 of the nonwoven fabric.

In the surface sheet 2 of the diaper 1, the length L1 of the Y direction of the convex part 21 located in 9 L of bulky areas is the same as the length of the Y direction of the convex part 21 located in the area|region other than 9 L of bulky areas. In addition, the length L1 of the convex part 21 shows the dimension along the Y direction of the bottom part of the convex part 21.

The length L1 of the convex portion 21 is preferably not less than 1 mm, more preferably not less than 2 mm, and preferably not more than 30 mm, more preferably not more than 5 mm, more specifically, not less than 1 mm and not more than 30 mm, and still more preferably not less than 2 mm and not more than 5 mm.

The method of manufacturing the diaper 1 of this embodiment is not particularly limited, and it can be manufactured by any method. Hereinafter, a preferable example of the manufacturing method of the diaper 1 of this embodiment is demonstrated with reference to FIG. 5. FIG.

As shown in FIG. 5 , this is performed using a press roll 100 . The pressing roll 100 includes: a first roll 102 provided on a peripheral surface with a pair of depressed concave portions 101 forming a pair of bulky regions 9L; and a second roll 103 having a flat peripheral surface. The pair of concave portions 101 of the first roller 102 are formed at positions corresponding to the pair of space portions 41s, 41s or the low basic weight portion of the absorptive core 41 constituting the absorber 4, and are formed to correspond to the space portion 41s or the low basic weight portion. The outline of the gram weight portion is similar in shape. Moreover, the depth of the recess of the recessed part 101 is larger than the height of the convex part 21 of the surface sheet 2. As shown in FIG.

First, as the topsheet 2 of the diaper 1, for example, the topsheet described in JP 2004-174234 A for which the present applicant applied previously is used.

Moreover, as the absorptive core 41 of the diaper 1, the absorptive core in which a pair of space part 41s, 41s or a low basic weight part was formed by vacuumizing by a conventional method is used. The absorber 4 of the diaper 1 is formed by wrapping the absorptive core 41 which has a pair of space part 41s, 41s or the low basis weight part formed in this way with the sheet|seat sheet|seat 42.

Next, the belt-shaped top sheet 2 and the belt-shaped back sheet 3 are fixed in a conventional manner so as to sandwich a plurality of absorbers 4, 4 ... which are supplied at intervals in the conveying direction, and respectively Along both sides of the belt-shaped top sheet 2 in the conveying direction, the leg elastic members 63 are fixed in a state stretched in the conveying direction by a conventional method. In addition, on the upper surface side of the belt-shaped top sheet 2 (the surface side on which a plurality of protrusions 21 are arranged), belt-shaped three-dimensional gathers are formed respectively along the both sides of the conveying direction of the belt-shaped front sheet 2. The sheet 62 is fixed by a conventional method, and the three-dimensional gather forming elastic member 61 is fixed in a state stretched in the conveyance direction on the inner side in the width direction of each three-dimensional gather forming sheet 62 by a conventional method.

With the continuous body 104 of the disposable diaper 1 formed in the above manner, the upper surface side (the surface side on which a plurality of convex parts 21 are arranged) of the belt-shaped front sheet 2 is opposite to the first roller 102 of the pressing roller 100. In this way, it is conveyed between the first roller 102 and the second roller 103 . Then, the continuous body 104 of the conveyed disposable diaper 1 is pressed by the part other than the pair of concave parts 101 of the first roller 102, thereby reducing the height of the convex part 21, and making the position corresponding to the pair of concave parts 101 The height of the convex portion 21 in the area remains the same. In this way, the height of the convex portion 21 is maintained as it is in the pair of concave portions 101. The convex portion 21 is positioned in the pair of fluffy regions 9L, 9L, and the height of the convex portion 21 is formed lower. The convex part of the area|region other than a pair of fluffy area|region 9L, the convex part 21 located in the area|region (part 9h with high apparent density) other than 9L. Through the above steps, the continuous body 105 of the disposable diaper 1 comprising a belt-shaped front sheet 2 with a pair of fluffy regions 9L, 9L is obtained at intervals in the conveying direction, and the disposable diaper 1 is obtained by using a known cutting mechanism. The continuous body 105 is cut, and the disposable diaper 1 is obtained continuously. In addition, when pressurizing by the 1st roll 102 and the 2nd roll 103 of the press roll 100, it may heat, and may pressurize at normal temperature.

In addition, the above-mentioned manufacturing method of the disposable diaper 1 including a pair of bulky regions 9L, 9L is to first manufacture the continuous body 104 of the disposable diaper 1, and then use the first roller 102 and the second roller 103 of the pressing roller 100 to press However, for example, the first roller 102 and the second roller 103 of the pressing roller 100 can be used to only press the belt-shaped top sheet 2 to form a belt-shaped fabric with a pair of bulky regions 9L, 9L arranged at intervals in the conveying direction. Front piece 2. Specifically, the belt-shaped front sheet 2 formed in this way and provided with a pair of fluffy regions 9L, 9L at intervals may also be arranged on the absorbent body 4 that constitutes a plurality of absorbent bodies 4 that are supplied at intervals in the conveying direction. The positions corresponding to the pair of space parts 41s, 41s or the low basic weight part included in the core 41 form the continuous body 105 of the disposable diaper 1 in the above-mentioned manner, and the formed continuous body of the disposable diaper 1 is cut by a known cutting mechanism. 105 cuts off, thereby manufacturing disposable diapers 1 continuously.

The forming material of the disposable diaper 1 of this embodiment is demonstrated.

As the back sheet 3 and the sheet 62 for three-dimensional gathers formation, if it is normally used for absorbent articles, such as a disposable diaper, it can use without limitation in particular. For example, as the back sheet 3, a resin film or a laminate of a resin film and a nonwoven fabric or the like can be used. As the sheet 62 for forming three-dimensional gathers, a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof can be used.

As the fastening tape 7, if it is a material normally used for absorbent articles, such as a disposable diaper, it can use without limitation in particular. For example, hooks such as "MAGIC TAPE (registered trademark)" (manufactured by KURARAY), "QUICKLON (registered trademark)" (manufactured by YKK Company), and "MAGICLOTH (registered trademark)" (manufactured by KANEBO BELL-TOUCH) can be used. Parts (masculine parts), etc.

As the absorptive core 41 which comprises the absorber 4, the structure which hold|maintained the particle|grains of an absorbent polymer with the aggregate of fibers, such as a pulp fiber, etc. can be used. As the core wrap 42 constituting the absorber 4, a core wrap made of a hydrophilic sheet such as a water-permeable tissue paper (tissue paper) or a water-permeable nonwoven fabric can be used.

As the elastic member 61 for forming three-dimensional gathers, the leg elastic member 63 and the waist elastic member, materials including natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, etc. can be used. Polyethylene-α-olefin copolymers such as ethyl acrylate-ethylene and other linear stretchable materials.

As an adhesive used for fixing each member, if it is a material normally used for absorbent articles, such as a disposable diaper, it can use without limitation in particular, For example, a hot-melt adhesive can be used. As the hot-melt adhesive, for example, styrene-isoprene-styrene block copolymer (SIS, Styrene-Isoprene-Styrene), styrene-butadiene-styrene block copolymer (SBS, Block copolymer hot melt adhesives such as Styrene-Butadiene-Styrene), styrene-ethylene-butylene-styrene copolymer (SEBS, Styrene-Ethylene-Butylene-Styrene).

The effect at the time of using the disposable diaper 1 which concerns on embodiment of this invention mentioned above is demonstrated.

Since the topsheet 2 of the diaper 1 is formed of a fluffy nonwoven fabric, it has good cushioning properties when worn, and has good usability due to less rewet after absorption of bodily fluids. In addition, in the diaper 1, as shown in FIG. 1 , a pair of bulky regions 9L, 9L are disposed on the portion of the front sheet 2 other than the backside region B, so that, for example, loose stools excreted in the backside region B tend to be released on the backside. Diffuses in the width direction (X direction) in the region B, but sufficiently diffuses in the back region B easily. Therefore, for example, the amount of loose stools that spread to the crotch region C through the central portion 5m can be suppressed, and the pair of fluffy regions 9L, 9L can suppress the loose stools that spread to the crotch region C, thereby further improving the side leakage prevention of loose stools. .

In addition, in the diaper 1, the absorptive core 41 constituting the absorber 4 includes a pair of space portions 41s, 41s as shown in FIG. For the fluffy area 9L, 9L. Therefore, for example, soft stools blocked by the bulky regions 9L and 9L are easily absorbed into the absorptive core 41 through the pair of space portions 41s and 41s, and the side leakage prevention property of soft stools can be further improved.

Moreover, in the diaper 1, as shown in FIG. 1, 9 L of bulky areas are arrange|positioned not only in the area|region except the back side area|region B, but also in the abdomen side area|region A, and are arrange|positioned in the crotch area|region C. Therefore, even if the diaper 1 in a state pressurized by packaging is taken out and used, the volume of the bulky region 9L can be maintained, and the side leakage prevention property of soft stools can be further improved.

In the diaper 1 in which the bulky region 9L is disposed only in the crotch region C, as described above, the volume of the bulky region 9L can be maintained, and not only that, but also the apparent density in the crotch region C can be reduced by folding and packaging. The state of the lower topsheet 2 is maintained. Thus, even if the packaged diaper 1 is taken out for use, the volume of the bulky region 9L can be maintained, and the wrinkles generated in ordinary absorbent articles such as diapers can be reduced, and the lateral movement of absorbent articles such as diapers can be reduced. The susceptibility to seepage of liquid (causing leakage), discomfort during wearing, or chafing is reduced.

In the above-mentioned manufacturing method of the diaper 1 using the pressing roller 100, from the viewpoint of stabilizing the state in which the density is formed relatively low, the treatment of the front sheet 2 in the crotch region C is preferably such that the fibers of the top sheet 2 are The welded state is further improved in the fluffy region 9L (increases the welded amount or welded points), but usually tends to cause a decrease in texture. Therefore, in general, it is considered to maintain the texture (softness) by treating the concave portion (absorber side) of the uneven structure or by treating at a relatively low temperature, but it may be difficult to achieve stability and the effect may be reduced. In addition, depending on the structure of the absorbent article, it may be difficult to maintain the bulky second sheet and the absorber in a low-density state, and the effect may be reduced.

However, in the diaper (absorbent article) of the present invention, when folded in half or in three, the crotch region C is absorbed between the crotch regions or between the crotch region and a different region (back side or abdomen side region). The shapes of the bodies facing each other are folded. Furthermore, since there are few creases by folding, gaps are not easily formed, the folded shape is stable, the topsheet 2 is stably sandwiched, and a low-density state is easily maintained. In particular, the front sheet using a core-sheath structure fiber (core component is polyester, polypropylene, etc.) with polyethylene as the sheath component is exposed to relatively low temperatures of 60 to 90°C, preferably 65 to 80°C. During the treatment, the front sheet 2 can be sandwiched stably, and it is easy to maintain a low-density state, and a stable effect can be exhibited for a long time.

As a structure of an absorbent article such as a diaper that exerts a stabilizing effect, a general structure can be used by utilizing the stabilizing effect of the above-mentioned folded shape. If the shape of the absorber in the central region is slightly thicker locally, a region in which the degree of adhesion is improved is formed, and the effect can be enhanced.

Moreover, if the adhesive agent is arrange|positioned locally between the surface sheet 2 and the absorber 4, or the absorber surface side of a surface sheet has a local convex structure, fixability can be improved locally and stability can be improved.

In the folding of absorbent articles such as diapers, the absorbing surfaces face each other to stabilize the foldability, and the compression of the front sheet 2 in the overlapping portion of the absorber 4 is uniformized, and the front sheet 2 in the crotch region C maintains a larger bulky region 9L. The density of the middle portion is high, thereby, in addition to obtaining the above-mentioned functions, it also has the new effect of being able to stably obtain a smooth feeling without discomfort.

Furthermore, when folded absorbent articles such as diapers are packaged in a stacked state, it is easier to obtain the effect over a longer period of time, and stability is improved compared to the case of storing them individually. This effect can be exhibited even if the package is unsealed as long as it is in a stacked state.

In addition, in the diaper 1, as shown in FIGS. 2 and 4 , the front sheet 2 includes a bulky nonwoven fabric having a concavo-convex structure including a plurality of protrusions 21 and recesses 22, and therefore, it is easy to form the bulky region 9L. , so that the feeling of use is further improved, and the side leakage prevention of soft stools can be further improved.

In addition, in the front sheet 2 of the diaper 1, as shown in FIGS. 2 and 4 , the apparent thickness of the bulky region 9L is higher than the apparent thickness of the portion 9h having the highest apparent density in the central portion 5m of the crotch region C. Therefore, it is easy to block loose stools spreading in the width direction (X direction) in the crotch region C, and the side leakage prevention property of soft stools can be further improved.

In addition, in the diaper 1, the sides 90, 90 of the pair of bulky regions 9L, 9L formed bilaterally symmetrically with respect to the center line CL face each other, and are formed in an arc shape protruding inward, so that the spread width of soft feces increases as it moves toward the crotch. The central portion of the upper region C becomes narrower. Therefore, the soft stool excreted in the back region B easily spreads to the center of the crotch region C through the central portion 5m, and the side leakage prevention property of the soft stool can be further improved.

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

The disposable diaper which is one embodiment of the absorbent article of this invention is not limited at all to the disposable diaper 1 of said embodiment, It can change suitably.

For example, in the disposable diaper 1 of the above-mentioned embodiment, as shown in FIG. 1 and FIG. Direction) both side edges protrude inward toward the center line CL to form a space portion 41s formed by removing pulp in an arc shape or a low basic weight portion formed by reducing the basic weight of pulp. In place of the shape of the space portion 41s or the low basic weight portion of the absorbent core 41, as shown in FIG. Both side edges in the longitudinal direction (Y direction) are positioned closer to the inner side, and are formed in an arc shape that protrudes inward toward the center line CL.

In addition, as shown in Fig. 7, the space portion 41s or the low basic weight portion may include a first space portion 41s1 and a second space portion 41s2. Specifically, in the crotch region C, the first space portion 41s1 is formed in an arc shape protruding inward from both side edges of the absorptive core 41 along the longitudinal direction (Y direction) toward the center line CL, and 2nd space part 41s2 is located inside rather than the arc-shaped top part of 1st space part 41s1, and is formed in a pair of rectangular shapes.

Moreover, as shown in FIG. 8, 41 s of space parts or a low basic weight part may include 1st space part 41s1 and 3rd space part 41s3. Specifically, in the crotch region C, the first space portion 41s1 is located on the inside of both side edges along the longitudinal direction (Y direction) of the absorptive core 41, and its shape is formed inward toward the center line CL. The third space portion 41s3 is protruding in an arc shape, and the third space portion 41s3 is located in the middle of the arc-shaped tops of the adjacent first space portion 41s1, and is formed in a single rectangular shape. In addition, as shown in FIG. 8 , the one rectangular-shaped third space portion 41s3 has its end portion on the back side region B side arranged on the back side region B side of each of the pair of arc-shaped first space portions 41s1 and 41s1. The end of is close to the ventral area A.

In addition, as shown in FIG. 9 , the space portion 41s or the low basic weight portion may be located on both sides of the absorptive core 41 along the longitudinal direction (Y direction), from the back region B to the crotch region C. It is formed in a straight line in the entire region from the crotch region C to the abdomen region A.

In addition, in the disposable diaper 1 of the said embodiment, as shown in FIG. 1, FIG. The corresponding position of the heavy part, but it may not be arranged correspondingly.

Moreover, in the disposable diaper 1 of said embodiment, when the space part 41s contained in the absorptive core 41 which comprises the absorber 4, or the shape of the low basic weight part is the shape shown in FIG. The region 9L is arranged at a position corresponding to the space portion 41s or the low basic weight portion as shown in FIG. 1 and FIG. The fluffy region 9L of the front sheet 2 can also be shown in Figure 10, similar to the shape of a pair of space parts 41s, 41s or the low basic weight part shown in Figure 6, located in the crotch region C than the edge of the front sheet 2. The two side edges in the longitudinal direction (Y direction) are positioned closer to the inner side, and the shape thereof is formed in an arc shape protruding inward toward the center line CL.

In addition, for example, when the space portion 41s or the low basic weight portion includes the first space portion 41s1 and the second space portion 41s2 and has the shape shown in FIG. As shown in FIG. 11 , 9L may include a pair of first bulky regions 9La, 9La and further have a pair of central bulky regions 9Lb, 9Lb between the pair of first bulky regions 9La, 9La. Specifically, the bulky region 9L of the front sheet 2 is similar in shape to the two pairs of space portions 41s (the first space portion 41s1 and the second space portion 41s2) shown in FIG. In 5s, a pair of first bulky regions 9La, 9La is formed in an arc shape protruding inward toward the center line CL from both side edges of the front sheet 2 along the longitudinal direction (Y direction), and in the pair of first bulky regions. Between the 1 bulky area 9La, 9La, a pair of central bulky area 9Lb, 9Lb is located inside rather than the top of the arc-shaped bulky area 9La, and is formed in the rectangular shape long in a Y direction. At this time, as shown in FIG. 11 , the pair of central bulky regions 9Lb and 9Lb have their end portions on the back side region B side arranged at the ends of the pair of arc-shaped bulky regions 9La and 9La on the back side region B side. The position near the ventral area A. In addition, the fluffy region 9L of the front sheet 2 may be a pair of space portions 41s, 41s (first space portion 41s) of one of the two pairs of space portions 41s (the first space portion 41s1 and the second space portion 41s2) shown in FIG. The shape of the portion 41s1 or the second space portion 41s2) is formed similarly. For example, it can also be similar to the shape of the inner pair of space portions 41s, 41s (the second space portion 41s2) among the two pairs of space portions 41s (the first space portion 41s1 and the second space portion 41s2) shown in FIG. As shown in FIG. 12 , only a pair of central bulky regions 9Lb, 9Lb is formed in a rectangular shape long in the Y direction.

In addition, for example, when the space portion 41s (the first space portion 41s1 and the third space portion 41s3) is the shape shown in the above-mentioned FIG. One bulky region 9La, 9La further has one second central bulky region 9Lc between the pair of first bulky regions 9La, 9La. Specifically, the bulky region 9L of the front sheet 2 may also be similar in shape to the three space portions 41s (the first space portion 41s1 and the third space portion 41s3) shown in FIG. The first bulky regions 9La, 9La are located on the inside of both side edges along the longitudinal direction (Y direction) of the top sheet 2, and are formed in an arc shape protruding inward toward the center line CL, Between the pair of bulky regions 9La, 9La, one second central bulky region 9Lc is located inside the top of the arc-shaped bulky region 9La, and is formed in a rectangular shape long in the Y direction. At this time, as shown in FIG. 13 , the end of the second central bulky region 9Lc on the side of the back region B is arranged on the side of the back region B of the pair of arc-shaped bulky regions 9La and 9La. The location near the ventral area A. When the second central bulky area 9Lc is disposed closer to the ventral area A than the pair of arc-shaped bulky areas 9La and 9La, it is possible to further prevent soft feces excreted in the back area B from passing through the crotch area C. Spreading to the ventral region A can further prevent leakage on the ventral side.

In addition, for example, when the shape of the space portion 41s or the low basic weight portion is the shape shown in the above-mentioned FIG. The shape of the low basic weight portion is similar, on both sides of the front sheet 2 along the longitudinal direction (Y direction), from the part of the crotch region C in the back region B to the abdomen region A through the crotch region C It is formed as a straight line in the entire area.

In addition, in the disposable diaper 1 of the above-mentioned embodiment, as the front sheet 2, a fluffy nonwoven fabric is used, and the nonwoven fabric includes the first layer 23 and the second layer 24 as shown in FIGS. It has a concavo-convex structure in which the first layer 23 side is formed with a plurality of convex portions 21 protruding toward the skin facing side and the inside becomes a cavity, and concave portions 22 are formed between the convex portions 21, but it can also be substituted for the non-woven fabric of the concavo-convex structure, On the other hand, a bulky nonwoven fabric having two layers and a concavo-convex structure having a plurality of solid protrusions and recesses between the protrusions was used. As such a nonwoven fabric, the surface sheet described in Unexamined-Japanese-Patent No. 2002-187228 which this applicant applied previously can be mentioned, for example. In addition, instead of the non-woven fabric having the above-mentioned concavo-convex structure having two layers, a non-woven fabric having one layer may be used, and the non-woven fabric has a plurality of protrusions raised toward the side facing the skin and a gap between the protrusions. A fluffy nonwoven fabric with a concavo-convex structure of the concave part. As such a nonwoven fabric, the surface sheet described in Unexamined-Japanese-Patent No. 2012-136790 which this applicant applied previously can be mentioned, for example.

In addition, in the disposable diaper 1 of the said embodiment, as the front sheet 2, as shown in FIG. 2 and FIG. The fluffy non-woven fabric of the concavo-convex structure of the concave portion 22, but also can replace the non-woven fabric of this concavo-convex structure, and use not only to the skin-facing face side but also to the non-skin-facing face side bulge and the protruding portion. The fluffy nonwoven fabric of the irregularities structure of the concave part between parts. The concave-convex structure of such a nonwoven fabric can include, for example, a groove structure in which the convex portion 21 is a ridge and the concave portion 22 is a groove. In addition, the convex part 21 of a ridge is solid. If a nonwoven fabric with such a concave-convex structure provided with such ridges is used, the soft feces excreted in the back region B will easily spread in the longitudinal direction (Y direction), and side leakage from the crotch region C can be further prevented. Examples of the nonwoven fabric having the concavo-convex structure provided with such ridges include the top sheet described in Japanese Patent Application Laid-Open No. 2009-153937 for which the present applicant previously applied.

In addition, the disposable diaper 1 of the said embodiment is an unfolded type disposable diaper as shown in FIG.

Regarding the above-mentioned embodiment, the following absorbent articles are further described.

<1>

An absorbent article comprising an elongated absorbent body having a liquid-permeable front sheet disposed on a skin-facing side, and a liquid-impermeable back sheet disposed on a non-skin-facing side A sheet and an absorbent body arranged between the two sheets, wherein,

The absorbent main body is divided into an abdominal region located on the abdominal side of the wearer when worn, a dorsal region located on the back side, and a crotch region arranged between the abdominal region and the dorsal region,

The above-mentioned front sheet comprises a fluffy non-woven fabric,

In the above-mentioned front sheet except the above-mentioned backside region, at least one pair of bulky regions are arranged on both sides of the above-mentioned absorbent main body in the longitudinal direction, and the part with the highest apparent density in the central part of the above-mentioned crotch region In contrast, the apparent density of the fluffy region is low.

<2>

The absorbent article according to <1>, wherein the absorbent body includes an absorbent core having a low basic weight portion in which a pulp constituting the absorbent core has a relatively low basic weight, or does not have the absorbent core constituting the absorbent core. The Space Division of Pulp,

The said bulky area|region is arrange|positioned at the position corresponding to the said low basic weight part or the said space part.

<3>

The absorbent article according to <1> or <2>, wherein the bulky region does not exist in the abdominal region and is arranged in the crotch region.

<4>

The absorbent article according to any one of <1> to <3>, wherein the above-mentioned top sheet includes a fluffy nonwoven fabric having a concave-convex structure including at least a plurality of convex portions raised toward the side opposite to the skin and aligned with the surface. The convex portion adjoins the concave portion of the depression.

<5>

The absorbent article according to <4>, wherein the concave-convex structure is a 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 apparent thickness of the bulky region is higher than the apparent thickness of a portion with the highest apparent density in the central portion of the crotch region.

<7>

The absorbent article according to any one of <1> to <6>, wherein the innermost side of the sides constituting the outline of the bulky region in a plan view is formed in an arc shape protruding inward, constituting the pair of bulky regions The sides of the are opposite each other.

<8>

The absorbent article according to any one of <4> to <7>, wherein the maximum width of the bulky region in plan view is larger than the width of the protrusions of the nonwoven fabric constituting the uneven structure of the top sheet in the bulky region.

<9>

The absorbent article according to any one of <1> to <8>, wherein at least one central bulky region is further arranged between the pair of bulky regions, and the end of the central bulky region on the back side region side is arranged at The position is closer to the ventral region than the end of each of the pair of bulky regions on the side of the dorsal region.

<10>

A disposable diaper which is the absorbent article according to <1> to <9>.

<11>

Such as the disposable diaper of <10>, wherein the above-mentioned disposable diaper is an unfolded disposable diaper, a pair of buckle belts are provided on the left and right side edges of the back side area, and a pair of buckle belts is provided on the outer surface of the abdomen side area to make the buckle belt fasten. Buckle straps secure the straps.

<12>

The disposable diaper according to <10> or <11>, wherein the liquid-impermeable backsheet has an outer cover comprising a liquid-impermeable film and a nonwoven fabric disposed outside.

<13>

The disposable diaper according to <12>, wherein the outer cover body has a narrowed position, and the narrowed position is provided in the crotch region.

<14>

The disposable diaper according to any one of <10> to <13>, wherein the absorbent body includes an absorbent core formed by retaining particles of a water-absorbent polymer in an aggregate of pulp fibers, and a wrapping covering the absorbent core. chip.

<15>

The disposable diaper according to any one of <10> to <14>, wherein three-dimensional gather-forming sheets having elastic members fixed in a stretched state are disposed on both sides in the longitudinal direction of the disposable diaper, respectively. And it is fixed to the side part of the said top sheet, thereby forming a pair of three-dimensional gathers.

<16>

The disposable diaper according to any one of <10> to <15>, wherein leg elastic members for forming leg gathers are arranged in a stretched state on both sides of the disposable diaper in the longitudinal direction, respectively, Leg gathers are formed by contraction of the leg elastics.

<17>

The disposable diaper according to any one of <10> to <16>, wherein the basic weight of the low basic weight part of the above-mentioned absorbent core is lower than other parts, and the ratio of the low basic weight part/high basic weight part is 70% or less, preferably 50% or less.

<18>

The disposable diaper according to any one of <10> to <18>, wherein the absorber is formed by covering an absorptive core having an arc-shaped space formed to protrude inward with a wrapping sheet.

<19>

The disposable diaper according to any one of <10> to <18>, wherein a pair of bulky regions are disposed on the front sheet of the disposable diaper, and all regions other than the pair of bulky regions are of high apparent density Part, the density of the part with higher apparent density is uniform.

<20>

The disposable diaper according to any one of <10> to <18>, wherein the 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 disposable diaper according to any one of <10> to <20>, wherein the apparent density of the portion having a relatively high apparent density is 0.02 g/cm ³ or more, preferably 0.03 g/cm ³ or more, and is 0.1 g/cm ³ or less, preferably 0.07 g/cm ³ or less.

<22>

The disposable diaper according to any one of <10> to <20>, wherein the bulky region has an apparent density of 0.008 g/cm ³ or more, preferably 0.02 g/cm ³ or more, and further, 0.05 g/cm ³ or less, preferably 0.04 g/cm ³ or less.

<23>

The disposable diaper according to any one of <10> to <22>, wherein the apparent density of the bulky region is lower than the apparent density of the portion with a higher apparent density than the portion with a higher apparent density The apparent density is 0.8 times or less, preferably 0.5 times or less.

<24>

The disposable diaper according to any one of <10> to <23>, wherein in the above-mentioned disposable diaper, the space part of the above-mentioned absorbent core is formed from the side edge in the longitudinal direction of the absorbent core toward the center line. Inwardly protruding arc shape, similar to the shape of the space portion, the fluffy region of the front sheet is also formed in an arc shape protruding inwardly from the side edge along the length direction of the front sheet toward the center line, and when viewed from above Among the sides constituting the contour of the bulky region, the innermost side is formed in an arc shape protruding inwardly, and the sides constituting a pair of bulky regions face each other, and the shape of the bulky region is symmetrical about the center line.

<25>

The disposable diaper according to any one of <10> to <23>, wherein the front sheet of the disposable diaper includes a bulky nonwoven fabric having a plurality of protrusions raised toward the side facing the skin and The concavo-convex structure of the depressed recesses adjacent to the protrusions, the skin-facing side of the above-mentioned front sheet has an undulating structure, and the non-skin-facing side is flat, and the above-mentioned top sheet includes the first layer and the second layer of the sheet, The 1st layer constitutes the skin facing side of the front sheet, and the 2nd layer 24 constitutes the non-skin facing side of the front sheet, and the 1st layer is formed with a plurality of protrusions that protrude to the skin facing side and the inside becomes a cavity and between the protrusions A concave portion is formed, the second layer is flat, and the first layer and the second layer are bonded in the concave portion.

<26>

The disposable diaper according to <25>, wherein the first layer and the second layer include the same or different sheet-like material, which is substantially non-stretchable and is a non-woven fabric produced by a carding method , any one of spunbond nonwoven fabric, meltblown nonwoven fabric, spunlace nonwoven fabric and needle punched nonwoven fabric, the fineness of its constituent fibers is more than 1dtex, preferably more than 1.5dtex, and less than 20dtex , preferably 5.6dtex or less.

<27>

The disposable diaper according to <25> or <26>, wherein, in the front sheet of the above-mentioned disposable diaper, the convex portion is surrounded by four or six concave portions having joining portions, the bottom surface thereof is flat, and the convex portion forms a ridge line as a whole Flattened cuboid or truncated cone with curvature.

＜28＞

The disposable diaper according to any one of <25> to <27>, wherein in the above-mentioned front sheet, the grammage of the bulky region is the same as the grammage of the part with the highest apparent density in the central part of the crotch region, including The overall grammage of the top sheets of the first layer and the second layer is uniform, and the overall grammage of the top sheet is 15 g/m ² or more, preferably 20 g/m ² or more, and is 150 g/m ² or less, preferably 60 g / ^m2 or less.

<29>

The disposable diaper according to any one of <10> to <28>, wherein the apparent thickness of the bulky region of the top sheet is 0.5 mm or more, preferably 1 mm or more, and is 5 mm or less, preferably 4 mm or less. The apparent thickness of the portion with a relatively high apparent density is 0.3 mm or more, preferably 0.5 mm or more, preferably 3 mm or less, preferably 2 mm or less.

<30>

The disposable diaper according to any one of <10> to <29>, wherein in the above-mentioned surface sheet, the apparent thickness of the bulky region is higher than the apparent thickness of the above-mentioned portion with a high apparent density, and is higher than the above-mentioned apparent thickness. The total thickness of the apparent thickness of the part with high apparent density and the thickness of the absorber is 1.2 times or more, preferably 1.6 times or more, the apparent thickness of the part with high apparent density.

<31>

The disposable diaper according to any one of <10> to <30>, wherein when the disposable diaper is viewed from above, the maximum width of the bulky region is formed larger than the convexity of the nonwoven fabric constituting the concave-convex structure of the top sheet in the bulky region. The width of the portion, the maximum width of the fluffy region is more than 2mm, preferably more than 5mm, and less than 50mm, preferably less than 20mm, the width of the convex portion located in the fluffy region is more than 1mm, preferably more than 2mm, and , is 30 mm or less, preferably 5 mm or less.

<32>

The disposable diaper according to any one of <10> to <31>, wherein in the topsheet of the above-mentioned disposable diaper, the maximum width of the bulky region is formed larger than that of the nonwoven fabric having the uneven structure constituting the topsheet in the bulky region. The width of the convex part of the cloth,

It is 2 times or more, preferably 5 times or more, the width of the convex part of a nonwoven fabric.

<33>

The disposable diaper according to any one of <10> to <32>, wherein in the front sheet of the disposable diaper, the length in the longitudinal direction of the protrusions located in the bulky region is different from the length of the protrusions located in a region other than the bulky region. The length in the longitudinal direction is the same, and the length of the convex portion is 1 mm or more, preferably 2 mm or more, and is 30 mm or less, preferably 5 mm or less.

<34>

The disposable diaper according to any one of <10> to <33>, wherein a structure in which aggregates of pulp fibers hold particles of a water-absorbing polymer is used as the absorbent core constituting the absorbent body, and as the absorbent core constituting the absorbent body, As the wrapping material of the absorber, a hydrophilic sheet is used, and a wrapping core composed of a water-permeable tissue paper (tissue paper) or a water-permeable nonwoven fabric is used.

<35>

The disposable diaper according to any one of <10> to <34>, wherein the elastic member for forming three-dimensional gathers and the leg elastic member are selected from natural rubber, polyurethane, and polystyrene-polyisoprene. A linear stretchable material made of ethylene copolymer, polystyrene-polybutadiene copolymer, and polyethylene-α-olefin copolymer of ethyl acrylate-ethylene.

<36>

The disposable diaper according to any one of <10> to <35>, wherein a hot-melt adhesive can be used as the adhesive for fixing each member, and a styrene-isocyanate can be used as the hot-melt adhesive. Block copolymerization of pentadiene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butylene-styrene copolymer (SEBS) hot melt adhesives.

<37>

The disposable diaper according to any one of <10> to <36>, wherein the space portion or the low basis weight portion of the above-mentioned absorbent core is located in the crotch region on the inner side than both side edges of the absorbent core in the longitudinal direction position, and its shape is formed in an arc shape that protrudes inward toward the center line.

<38>

The disposable diaper according to any one of <10> to <37>, wherein the space portion or the low basis weight portion of the absorbent core includes a first space portion and a second space portion, and in the crotch region, the first space The portion is formed in an arc shape protruding inward from both side edges in the longitudinal direction of the absorbent core toward the center line, and the second space portion is located on the inside of the arc-shaped top of the first space portion, forming is a pair of rectangular shapes.

<39>

The disposable diaper according to any one of <10> to <36>, wherein the space portion or the low basis weight portion of the absorbent core includes a first space portion and a third space portion, and in the crotch region, the first space The portion is located on the inner side of both sides of the absorbent core in the longitudinal direction, and its shape is formed in an arc shape that protrudes inward toward the center line, and the third space portion is located on the circle of the adjacent first space portion. The middle of the arc-shaped tops is formed into a rectangular shape, and the end of the back side region side of the third space part of the rectangular shape is arranged in the back side region of each of the first space parts of the pair of arcuate shapes. The end of the side is located near the ventral area.

<40>

The disposable diaper according to any one of <10> to <36>, wherein the space part or the low basis weight part of the above-mentioned absorbent core is on both sides of the absorbent core in the longitudinal direction, and is located near the back side region. The part of the crotch region is formed in a straight line through the entire region from the crotch region to the abdominal region.

<41>

The disposable diaper according to any one of <10> to <36>, wherein the shape of the space portion or the low basis weight portion of the absorptive core is such that the bulky region of the top sheet is arranged in the space portion or the low basis weight portion. part, but the shape of the space part or the low basis weight part is that the bulky area of the front sheet is similar to the shape of the pair of space parts or the low basis weight part, and it is located in the crotch region compared to the longitudinal direction of the absorbent core. The position on the inner side of the two side edges is formed into an arc shape protruding inward toward the center line.

<42>

The disposable diaper according to any one of <10> to <36>, wherein the space portion or the low basis weight portion of the absorbent core includes a first space portion and a second space portion, and the bulkiness of the front sheet in both side portions is The area has a pair of first bulky areas, and a pair of central bulky areas between the pair of first bulky areas. The bulky area of the front sheet is similar to the shape of the two pairs of space parts. On both sides of the crotch area, A pair of first bulky regions is formed in an arc shape protruding inward from both side edges in the longitudinal direction (Y direction) of the front sheet toward the center line CL, and between the pair of first bulky regions, a further The central fluffy region is positioned inwardly from the top of the arc-shaped fluffy region, and is formed in a long rectangular shape in the longitudinal direction. Ends on the side of the dorsal region of each of the arc-shaped fluffy regions are positioned closer to the ventral region.

<43>

The disposable diaper according to any one of <10> to <36>, wherein the space portion or the low basis weight portion of the absorbent core includes a first space portion and a second space portion, and does not have a top sheet on both sides. The bulky area has a pair of central bulky areas corresponding to the second space portion, and the central bulky area of the front sheet is formed in a long rectangular shape in the longitudinal direction similar to the shape of the second space portion.

<44>

The disposable diaper according to any one of <10> to <36>, wherein the absorptive core has a structure in which the space portion or the low basic weight portion of the absorptive core includes a pair of space portions, and the pair of space portions There is also a space between them, and in the crotch region, the above-mentioned pair of space parts are located on the inner side than the side edges along the longitudinal direction (Y direction) of the absorbent body, and the shape is formed to bulge inward toward the center line. arc-shaped, and between the pair of space portions, a central space portion is located on the inner side than the top of the arc-shaped space portion, and is formed in a long rectangular shape in the longitudinal direction. The end of the dorsal region side of the space portion is arranged at a position closer to the ventral region than the end of each of the dorsal region side of the pair of arc-shaped space portions,

The bulky area of the front sheet is similar to the shape of the three space parts of the above-mentioned absorbent core. In the crotch region, a pair of bulky areas are located on the inner side than the side edges of the front sheet in the longitudinal direction, and the shape is formed as follows: An arc shape protruding inward toward the center line, and between the pair of fluffy regions, one central fluffy region is located inwardly from the top of the arc-shaped fluffy region, and is formed to be longer in the longitudinal direction. The end of the one central bulky area on the back side is arranged closer to the ventral area than the end of each of the pair of arc-shaped bulky areas on the back side.

Example

Hereinafter, the present invention will be described in more detail using examples. But the scope of the present utility model is not limited by this embodiment.

[Example 1]

Using the apparatus shown in FIG. 5 , the M size of Merries (registered trademark) manufactured by Kao Co., Ltd., which is dry and breathable, is pressed in such a way that the upper surface side of the top sheet is opposed to the first roller 102 of the pressing roller 100, and produced The disposable diaper of Example 1 including a pair of bulky regions 9L, 9L. A pair of bulky regions 9L and 9L are formed in an arc shape protruding inward from the side edge along the longitudinal direction (Y direction) of the top sheet toward the center line CL. The total area of the pair of bulky regions 9L and 9L is 30.5 cm ² . In addition, the apparent density of the portion 9h having a relatively 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 (the height of the convex portion 21 located in the portion 9h) of the portion 9h with higher apparent density is 0.8 mm, and the apparent thickness of the bulky region 9L (the height of the convex portion 21 positioned in the bulky region 9L) is 1.5mm. In addition, in FIG. 15, the front sheet which the M size product of Merries (registered trademark) manufactured by Kao Co., Ltd. has dry and breathable is shown. The front sheet shown in FIG. 15 is a fluffy sheet as follows: it has an upper layer and a lower layer composed of sheets, the upper layer and the lower layer are partially bonded, the upper layer protrudes from the part other than the joint portion, and a plurality of hollow holes are formed. The convex part of the cavity.

[Example 2]

Remove the front sheet from the dry and breathable M size product of Merries (registered trademark) manufactured by Kao Co., Ltd., replace it with the nonwoven fabric shown below, and then press it using the device shown in Figure 5 in the same way as in Example 1, and A disposable diaper of Example 2 including a pair of bulky regions 9L, 9L was produced. The nonwoven fabric to be replaced is a fluffy sheet as shown in FIG. 16, which is a sheet in which a plurality of protrusions are formed on one sheet. This kind of non-woven fabric is supplied to the forming device by supplying the mesh fabric with a grammage of 30 g/m ² having core-sheath type composite fibers, and is placed on the base along the protrusions arranged on the base in the forming device. The mesh is manufactured by blowing hot air to shape it and welding the fibers. The non-woven fabric for replacement installation has a thickness of 2.5mm. Moreover, in the disposable diaper of Example 2, the total area of a pair of bulky area|region 9L, 9L was 30.5 cm< ² >. In addition, the apparent density of the portion 9h having a relatively 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 part 9h with high apparent density was 1.7 mm, and the apparent thickness of 9 L of bulky regions was 2.5 mm.

[Comparative example 1]

The M size of Merries (registered trademark) manufactured by Kao Co., Ltd. containing the top sheet shown in FIG. 15 was used as the disposable diaper of Comparative Example 1 without pressing using the apparatus shown in FIG. 5 .

[Comparative example 2]

Replace the first roller 102 having a pair of depressed concave portions 101 on the peripheral surface of the pressure roller 100 shown in FIG. The Merries (registered trademark) manufactured by Kao Co., Ltd., including the top sheet shown in FIG. 15 , which is dry and breathable in M size, was pressed so that the upper surface side of the top sheet faced the changed roller, and a pair of fluffy The disposable diaper of the comparative example 2 which area|region arrange|positioned in the whole area|region of the longitudinal direction (Y direction) of both side parts.

[Comparative example 3]

Replace the first roller 102 with a pair of depressed concave portions 101 on the peripheral surface of the pressing roller 100 shown in FIG. The Merries (registered trademark) manufactured by Kao Co., Ltd. is dry and breathable in M size so that the upper surface side of the top sheet is pressed against the changed roller to press the entire area, and the disposable of Comparative Example 3 without the fluffy area is produced. diaper.

[Comparative example 4]

The diaper obtained by replacing the front sheet of the M-size product of Merries (registered trademark) manufactured by Kao Co., Ltd. with a nonwoven fabric as shown in FIG. 16 instead of being pressed by the device shown in FIG. 4 disposable diapers.

[Comparative Example 5]

Replace the first roller 102 having a pair of depressed concave portions 101 on the periphery of the pressure roller 100 shown in FIG. The disposable diaper of Comparative Example 4 was pressed so that the upper surface side of the front sheet faced the changed roller, and a pair of bulky regions were arranged over the entire length direction (Y direction) of both sides. Disposable diaper of Comparative Example 5.

[Comparative Example 6]

Replace the first roller 102 with a pair of depressed concave portions 101 on the circumference of the pressure roller 100 shown in Figure 5 with a flat roller with no concave portion, and compare the disposable diaper of Comparative Example 4 with The entire area was pressed so that the upper surface side of the top sheet faced the changed roller, and the disposable diaper of Comparative Example 6 without the bulky area was produced.

〔Performance evaluation〕

About the disposable diapers of Examples 1-2 and Comparative Examples 1-6, the diffusivity of the soft stool at the time of wearing was evaluated by the following method. The evaluation environment was a room temperature of 23° C. and a humidity of 50% RH. These results are shown in Table 1 below.

〔Diffusibility when worn〕

About the disposable diaper obtained in Examples 1-2 and Comparative Examples 1-6, 10 mL of simulated soft stools were inject|poured into the center part in the back side area|region of the skin-facing side of a front sheet via a tube. The composition of the simulated soft stool is 28.0g of bentonite, 14.0g of glycerin, 114.1g of ion-exchanged water, 14.2g of Emulgen 130K 0.03% by weight aqueous solution (Kao), and the viscosity is 300mPa·s (23°C, vibrating viscometer: A&D Co., Ltd. Co., Ltd. manufacturing, SV-10).

After injection, place the film for OHP on the front sheet, use a roller with a diameter of 65 mm and a width of 65 mm from the film for OHP, and measure the diffusion width when the roller is rolled to the ventral area and the area from the injection point to the ventral area. Diffusion distance in the direction. Three samples were measured for each diaper, and the average value of the measured values was calculated|required and shown in Table 1.

[Table 1]

From the results shown in Table 1, it is clear that the disposable diapers of Examples 1 to 2, compared with the disposable diapers of Comparative Examples 1 to 6, have accelerated diffusion in the length direction of the crotch region, and the diffusion in the width direction has been accelerated. Diffusion is inhibited. Therefore, according to the disposable diaper of Examples 1-2, side leakage of soft stool can be expected to be effectively prevented.

On the other hand, since the disposable diapers of Comparative Examples 1 and 4 do not have a bulky region, it can be seen that the crotch region easily spreads not only in the longitudinal direction but also in the width direction. In addition, in the disposable diapers of Comparative Examples 2 and 5, a pair of bulky regions exist on both sides in the longitudinal direction over the entire region, so that the diffusion to the crotch region is excessively promoted, and the bulky region is also diffused in the width direction. In addition, it can be seen that there is no bulky area in the disposable diapers of Comparative Examples 3 and 6, but the entire area is a part with high apparent density. Therefore, in the crotch area, it is easy to spread not only in the longitudinal direction but also in the width direction. spread in the direction.

[industrial availability]

According to the absorbent article of the present invention, the cushioning property at the time of wearing is good, the rewet after absorption of bodily fluid is small, the usability is good, and the side leakage prevention property of bodily fluid is further improved.

Claims (43)

1. An absorbent article comprising a longitudinally long absorbent main body having a liquid-permeable front sheet arranged on a skin-facing side, and a liquid-impermeable front sheet arranged on a non-skin-facing side. The back sheet and the absorbent body arranged between the two sheets, the absorbent article is characterized in that: The absorbent main body is divided into an abdominal region located on the abdominal side of the wearer when worn, a dorsal region located on the back side, and a crotch region arranged between the abdominal region and the dorsal region, The front sheet comprises a fluffy non-woven fabric, On the front sheet except for the backside region, at least one pair of fluffy regions are arranged on both sides of the absorbent main body in the longitudinal direction, which is consistent with the appearance in the central part of the crotch region. The apparent density of this fluffy region is lower compared to the densest part. 2. The absorbent article of claim 1, wherein: The absorbent body includes an absorbent core having a low basic weight portion in which the basis weight of pulp constituting the absorbent core is relatively low, or a space portion in which pulp constituting the absorbent core does not exist, The bulky area is arranged at a position corresponding to the low basic weight portion or the space portion. 3. The absorbent article of claim 1, wherein: The bulky area does not exist in the abdominal area, but is arranged in the crotch area. 4. The absorbent article of claim 1, wherein: The top sheet includes a fluffy non-woven fabric having a concave-convex structure including at least a plurality of convex portions raised toward the side facing the skin and concave concave portions adjacent to the convex portions. 5. The absorbent article of claim 4, wherein: The concavo-convex structure is a ridge-groove structure in which the protrusions are ridges and the recesses are grooves. 6. The absorbent article of claim 1, wherein: The apparent thickness of the bulky region is higher than the apparent thickness of a portion with the highest apparent density in the central portion of the crotch region. 7. The absorbent article of claim 1, wherein: Among the sides constituting the outline of the bulky region in a plan view, the innermost side is formed in an arc shape protruding inward, and the sides constituting the pair of bulky regions face each other. 8. The absorbent article of claim 4, wherein: The maximum width of the bulky region in a planar view is larger than the width of the protrusions of the nonwoven fabric constituting the concavo-convex structure of the top sheet in the bulky region. 9. The absorbent article of claim 1, wherein: At least one central bulky area is disposed between the pair of bulky areas, and the end of the central bulky area on the back side is arranged on the abdomen side of the respective ends of the pair of bulky areas on the back side. The position of the side area. 10. A disposable diaper, characterized in that: The disposable diaper is the absorbent article according to claim 1 . 11. The disposable diaper of claim 10, wherein: The disposable diaper is an unfolded disposable diaper, and a pair of buckle belts are provided on the left and right side edges of the back side area, and a strap for fixing the buckle belts is provided on the outer surface of the abdomen side area. 12. The disposable diaper of claim 10, wherein: The liquid-impermeable back sheet has an outer cover including a liquid-impermeable film and a nonwoven fabric disposed outside. 13. The disposable diaper of claim 12, wherein: There is a narrowing position in the outer covering body, and the narrowing position is arranged in the crotch region. 14. The disposable diaper of claim 10, wherein: The absorbent body includes an absorptive core formed by retaining particles of a water-absorbing polymer in an aggregate of pulp fibers, and a core wrapping covering the absorptive core. 15. The disposable diaper of claim 10, wherein: On both sides of the longitudinal direction of the disposable diaper, three-dimensional gathers forming sheets having elastic members fixed in a stretched state are arranged and fixed on the side portions of the front sheet, thereby forming a pair of three-dimensional gathers. wrinkled. 16. The disposable diaper of claim 10, wherein: The leg elastic members for forming leg gathers are arranged in a stretched state on both sides in the longitudinal direction of the disposable diaper, and leg gathers are formed by contraction of the leg elastic members. 17. The disposable diaper of claim 10, wherein: The absorber is formed by covering an absorptive core having an arc-shaped space formed to protrude inward with a wrapping sheet. 18. The disposable diaper of claim 10, wherein: A pair of bulky regions are disposed on the top sheet of the disposable diaper, and all regions other than the pair of bulky regions are parts with high apparent density, and the density of the parts with high apparent density is uniform. 19. The disposable diaper of claim 10, wherein: The total area of the pair of fluffy regions is not less than 5 cm ² and not more than 150 cm ² . 20. The disposable diaper of claim 10, wherein: The apparent density of the portion with a relatively high apparent density is not less than 0.02 g/cm ³ and not more than 0.1 g/cm ³ . 21. The disposable diaper of claim 10, wherein: The bulky region has an apparent density of not less than 0.008 g/cm ³ and not more than 0.05 g/cm ³ . 22. The disposable diaper of claim 10, wherein: The apparent density of the bulky region is lower than the apparent density of the portion with a higher apparent density, and is not more than 0.8 times the apparent density of the portion with a higher apparent density. 23. The disposable diaper of claim 10, wherein: In the disposable diaper, the space portion of the absorbent core is formed in an arc shape protruding inward from the side edge in the longitudinal direction of the absorbent core toward the center line, similarly to the shape of the space portion The fluffy region of the front sheet is also formed into an arc shape protruding inwardly from the side edge in the longitudinal direction of the front sheet toward the center line, and the innermost side of the edges constituting the outline of the fluffy region is formed as Inwardly protruding arcs, the sides constituting a pair of fluffy regions face each other, and the shape of the fluffy regions is symmetrical about the center line. 24. The disposable diaper of claim 10, wherein: The front sheet of the disposable diaper includes a fluffy nonwoven fabric having a concavo-convex structure including a plurality of protrusions raised toward the side facing the skin and concave recesses adjacent to the protrusions. The skin-facing side of the skin has an undulating structure, and the non-skin-facing side is flat, and the front sheet includes a first layer and a second layer of a sheet, the first layer constitutes the skin-facing side of the front sheet, and the second layer constitutes On the non-skin-facing side of the front sheet, the first layer is formed with a plurality of protrusions that bulge toward the skin-facing side and the interior becomes a cavity, and recesses are formed between the protrusions, the second layer is planar, and the first layer is formed in the recesses. Join with layer 2. 25. The disposable diaper of claim 24, wherein: The first layer and the second layer include the same or different sheets, which are substantially non-stretchable, and are non-woven fabrics, spun-bonded non-woven fabrics, melt-blown fabrics produced by carding Any of non-woven fabric, spunlace non-woven fabric and needle-punched non-woven fabric, the fineness of the constituent fibers is 1 dtex or more and 20 dtex or less. 26. The disposable diaper of claim 24, wherein: In the front sheet of the disposable diaper, the convex portion is surrounded by four or six concave portions having joints, the bottom surface thereof is flat, and the convex portion as a whole is a flat rectangular parallelepiped or truncated cone with curved ridgelines. 27. The disposable diaper of claim 24, wherein: In the front sheet, the grammage of the bulky region is the same as the grammage of the part with the highest apparent density in the central part of the crotch region, and the grammage of the entire front sheet including the first layer and the second layer is uniform. The grammage of the entire sheet is not less than 15 g/m ² and not more than 150 g/m ² . 28. The disposable diaper of claim 10, wherein: The apparent thickness of the bulky region of the top sheet is not less than 0.5 mm and not more than 5 mm, and the apparent thickness of the portion with a higher apparent density is not less than 0.3 mm and not more than 3 mm. 29. The disposable diaper of claim 10, wherein: In the top sheet, the apparent thickness of the bulky region is higher than the apparent thickness of the portion with a higher apparent density, and is higher than the apparent thickness of the portion with a higher apparent density and the thickness of the absorbent body. The total thickness is 1.2 times or more than the apparent thickness of the part with higher apparent density. 30. The disposable diaper of claim 10, wherein: When the disposable diaper is viewed from above, the maximum width of the bulky region is formed to be larger than the width of the convex portion of the nonwoven fabric constituting the uneven structure of the front sheet in the bulky region, and the maximum width of the bulky region is 2 mm to 50 mm. The width of the convex portion of the bulky region is not less than 1 mm and not more than 30 mm. 31. The disposable diaper of claim 10, wherein: In the front sheet of the disposable diaper, the maximum width of the bulky region is formed to be larger than the width of the convex portion of the nonwoven fabric constituting the uneven structure of the top sheet in the bulky region, and is equal to the width of the convex portion of the nonwoven fabric. More than 2 times. 32. The disposable diaper of claim 10, wherein: In the top sheet of the disposable diaper, the longitudinal length of the protrusions located in the bulky region is the same as the longitudinal length of the protrusions located in regions other than the bulky region, and the length of the protrusions is not less than 1 mm and not more than 30 mm. 33. The disposable diaper of claim 10, wherein: As the absorbent core constituting the absorbent body, a structure in which aggregates of pulp fibers hold water-absorbing polymer particles is used, and as a covering member constituting the absorbent body, a water-permeable sheet including a hydrophilic sheet is used. Wrap chips in tissue paper or permeable non-woven fabric. 34. The disposable diaper of claim 10, wherein: The space portion or the low basic weight portion of the absorbent core is located inside the crotch region from both side edges of the absorbent core in the longitudinal direction, and is formed in an arc shape that protrudes inward toward the center line. . 35. The disposable diaper of claim 10, wherein: The space portion or the low basic weight portion of the absorbent core includes a first space portion and a second space portion, and the first space portion is formed from both side edges in the longitudinal direction of the absorbent core toward the center in the crotch region. The wires have an arc shape protruding inward, and the second space portion is located inwardly from the arc-shaped top of the first space portion, forming a pair of rectangular shapes. 36. The disposable diaper of claim 10, wherein: The space portion or the low basic weight portion of the absorbent core includes a first space portion and a third space portion, and in the crotch region, the first space portion is located on the inner side of both side edges of the absorbent core in the longitudinal direction. position, its shape is formed into an arc shape protruding inward toward the center line, and the third space part is located in the middle of the arc-shaped tops of the adjacent first space part, and is formed in a rectangular shape. The end of the rectangular third space portion on the back side region is arranged closer to the ventral region than the end portion of each of the pair of arc-shaped first space portions on the back side region side. 37. The disposable diaper of claim 10, wherein: The space portion or the low basic weight portion of the absorbent core is located on both sides of the absorbent core in the longitudinal direction, in the entire region from the crotch region of the back region through the crotch region to the abdomen region. formed in a straight line. 38. The disposable diaper of claim 10, wherein: The space part or the low basic weight part of the absorptive core includes a first space part and a second space part, and the bulky area of the front sheet has a pair of first bulky areas in both side parts, and the pair of first bulky areas There is also a pair of central fluffy regions between them. The fluffy regions of the front sheet are similar in shape to the two pairs of space parts. On both sides of the crotch region, a pair of the first fluffy regions is formed from two sides of the front sheet along the length direction. The side edges are in an arc shape protruding inward toward the centerline, and between the pair of first fluffy regions, the pair of central fluffy regions are located on the inner side than the top of the arc-shaped fluffy region. In the longitudinally long rectangular shape, the ends on the back side of the pair of central bulky areas are arranged closer to the ventral area than the ends on the back side of the pair of arc-shaped bulky areas. 39. The disposable diaper of claim 10, wherein: The space part or the low basic weight part of the absorptive core includes a first space part and a second space part, there are no bulky regions of the front sheet on both side parts, and a pair of central bulky areas are provided corresponding to the second space part. The central fluffy area of the front sheet is formed in a rectangular shape that is long in the longitudinal direction, similar to the shape of the second space portion. 40. The disposable diaper of claim 10, wherein: The absorptive core has a structure in which the space part or the low basic weight part of the absorptive core includes a pair of space parts, and there is one space part between the pair of space parts, and in the crotch region, the A pair of space parts is located on the inner side than both side edges along the length direction of the absorber, and its shape is formed in an arc shape protruding inward toward the center line, and between the pair of space parts, there is a central space The part is located at the inner side than the top of the arc-shaped space part, and is formed in a long rectangular shape in the longitudinal direction. The end of each space part on the side of the dorsal region is close to the position of the ventral region, The bulky area of the front sheet is similar to the shape of the three spaces of the absorbent core. In the crotch region, a pair of bulky areas are located on the inner side of both side edges of the front sheet in the longitudinal direction, and their shape forms It is an arc shape protruding inward toward the center line, and between the pair of fluffy regions, a central fluffy region is located on the inner side than the top of the arc-shaped fluffy region, and is formed to be shorter in the length direction. It has a long rectangular shape, and the end of the one central bulky area on the side of the back side is arranged closer to the ventral area than the end of each of the pair of arc-shaped bulky areas on the side of the back side. 41. A disposable diaper characterized by: The disposable diaper is the absorbent article according to claim 2 . 42. The disposable diaper of claim 41, wherein: The basic weight of the said low basic weight part of the said absorptive core is lower than other parts, and the ratio of low basic weight part/high basic weight part is 70 % or less. 43. The disposable diaper of claim 41, wherein: The bulky area of the front sheet is disposed at a position corresponding to the space portion or the low basic weight portion, or the bulky area of the front sheet is similar in shape to a pair of space portions or the low basic weight portion, and is located in the crotch region. The inner positions of both side edges along the length direction of the core are formed in an arc shape protruding inward toward the center line.