TW201509388A - Absorbent article - Google Patents

Abstract

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

Description

Absorbent article

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

Since the prior art, an absorbent article having a front sheet having a concave-convex structure for preventing leakage of bodily fluids such as soft stools and menstrual blood has been known.

For example, Patent Document 1 discloses a disposable diaper having a front sheet, in which a plurality of first convex portions are provided on a skin facing surface disposed in a central portion of a central portion extending in the longitudinal direction, and A plurality of second convex portions having a height higher than that of the first convex portion are provided on each of the skin facing surfaces disposed on one of the right and left sides of the central region. The disposable diaper-based front sheet described in Patent Document 1 includes a plurality of convex portions. Therefore, the cushioning property at the time of wearing is good, and for example, the moisture absorption after absorption of the soft stool is small, and the feeling of use is good. Further, the disposable diaper described in Patent Document 1 is attached to the crotch region, and the height of the plurality of second convex portions provided in the pair of side regions is higher than the height of the plurality of first convex portions provided in the central region. For example, the side leakage prevention performance of the soft stool is excellent.

Prior technical literature Patent literature

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

However, in the disposable diaper of the first aspect, the plurality of second convex portions provided in each of the pair of side regions are arranged in a line in the entire longitudinal direction of the diaper, and the convex portion is formed in the diaper width direction. Multiple lines. That is, the disposable urine described in Patent Document 1 In the cloth, the plurality of second convex portions are provided over the entire area from the back side region of each of the pair of side regions to the longitudinal direction of the front side region. Since the second convex portion is provided in this way, for example, the soft excretion in the back side region is less likely to spread in the width direction in the back side region, and a large amount of soft stool is easily diffused to the crotch region through the central region. If such a large amount of softness spreads to the underarm area and exceeds the absorption capacity of the underarm area, there is a possibility that the side leakage of the soft stool cannot be prevented, and there is a need to further improve the prevention of side leakage.

Accordingly, the present invention is directed to providing an absorbent article that satisfies the above needs.

The present invention relates to an absorbent article comprising a vertically long absorbent body comprising a liquid-permeable front sheet disposed on the opposite side of the skin and a liquid disposed on the non-skin facing side. A transparent back sheet and an absorber disposed between the two sheets. The absorptive body is divided into a ventral region on the ventral side of the wearer when worn, a backside region on the back side, and a crotch region disposed between the ventral region and the dorsal region. The front sheet includes a fluffy non-woven fabric, and the front sheet other than the back side region is provided with at least a pair of viewing densities lower than the underarm region on both sides of the absorbent body along the longitudinal direction. The fluffy area of the highest density in the central part.

1‧‧‧Disposable diapers

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

5‧‧‧Absorbing ontology

5m‧‧‧Central Department

5s‧‧‧ side

6‧‧‧Three-dimensional folds

7‧‧‧Buckle belt

8‧‧‧Fixed tape

9h‧‧‧ the highest density part

9L‧‧‧ fluffy area

9La‧‧‧1st fluffy area

9Lb‧‧‧Central Fluffy Area

9Lc‧‧‧2nd Central Fluffy Area

21‧‧‧ convex

22‧‧‧ recess

23‧‧‧1st floor

24‧‧‧2nd floor

41‧‧‧Absorbable core

41s‧‧‧ Space Department

41s1‧‧‧1st Space Department

41s2‧‧‧Second Space Department

41s3‧‧‧3rd Space Department

42‧‧‧Package

61‧‧‧Elastic members for the formation of three-dimensional pleats

62‧‧‧Three-dimensional pleat forming sheet

63‧‧‧ Leg elastic members for leg fold formation

90‧‧‧ side

100‧‧‧pressure roller

101‧‧‧ concave part

102‧‧‧1st roll

103‧‧‧2nd roller

104‧‧‧Continuous body of disposable diapers

105‧‧‧Continuous body of disposable diapers

A‧‧‧ Ventral area

B‧‧‧Back side area

C‧‧‧胯下区域

CL‧‧‧ center line

L1‧‧‧ length

T‧‧‧ area

Maximum width of the W1‧‧‧ fluffy area

W2‧‧‧Width of the convex part

X‧‧‧ direction

Y‧‧‧ direction

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

Figure 2 is a cross-sectional view taken along line I-I of Figure 1.

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

Figure 4 is a top plan view of the topsheet included in the disposable diaper of Figure 1.

Fig. 5 is a schematic view showing an example of a press roll used in the production of the unfolded disposable diaper according to the embodiment of the present invention.

Fig. 6 is a plan view (corresponding to Fig. 3) of an absorbent core used as a disposable diaper according to another embodiment of the present invention.

Fig. 7 is a plan view (corresponding to Fig. 3) of an absorbent core used as a disposable diaper according to still another embodiment of the present invention.

Fig. 8 is a plan view (corresponding to Fig. 3) of an absorbent core used as a disposable diaper according to still another embodiment of the present invention.

Fig. 9 is a plan view (corresponding to Fig. 3) of an absorbent core used as a disposable diaper according to still another embodiment of the present invention.

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

Fig. 11 is a plan view (corresponding to Fig. 4) of a top sheet used as a disposable diaper having the absorbent core shown in Fig. 7 as another embodiment of the present invention.

Fig. 12 is a plan view (corresponding to Fig. 4) of another top sheet used as a disposable diaper having the absorbent core shown in Fig. 7 according to another embodiment of the present invention.

Fig. 13 is a plan view (corresponding to Fig. 4) of a top sheet used as a disposable diaper having the absorbent core shown in Fig. 8 as another embodiment of the present invention.

Fig. 14 is a plan view (corresponding to Fig. 4) of a top sheet used as a disposable diaper having the absorbent core shown in Fig. 9 as another embodiment of the present invention.

Fig. 15 is a perspective view showing a front sheet included in the disposable diaper used in the production of the disposable diapers of Example 1 and Comparative Examples 1 to 3.

Fig. 16 is a perspective view showing a front sheet included in the disposable diaper used in the production of the disposable diaper of Example 2 and Comparative Examples 4 to 6.

Hereinafter, the absorbent article of the present invention will be described with reference to Figs. 1 to 4 in accordance with a preferred embodiment thereof. Fig. 1 is a plan view showing a partial fracture of the unfolded disposable diaper as an embodiment of the present invention as seen from the side of the front sheet; 2 is a cross-sectional view taken along line I-I of Fig. 1. Further, Fig. 3 is a plan view showing an absorbent core of the absorbent body included in the disposable diaper shown in Fig. 1, and Fig. 4 is a plan view showing the top sheet included in the disposable diaper shown in Fig. 1.

As shown in Fig. 1, the disposable diaper 1 (hereinafter also referred to as "diaper 1") of the present embodiment includes a vertically long absorbent body 5 having liquid permeation disposed on the opposite side of the skin. The front sheet 2, the back sheet 3 disposed on the non-skin facing side, and the absorber 4 disposed between the two sheets 2 and 3. The absorptive body 5 is divided into a ventral region A located on the ventral side of the wearer when worn, a back side region B on the back side, and a crotch region C disposed between the ventral region A and the back side region B. As shown in Fig. 1, the diaper 1 is formed to be bilaterally symmetrical with respect to a center line CL extending in the longitudinal direction.

In the present invention, in the unfolded state of the diaper, the diaper of the following 1) to 3) is divided, and the ventral region A, the back side region B, and the underarm region C are determined. Specifically, in the diaper according to the present embodiment, in the unfolded state of the diaper (Fig. 1), 1) the region corresponding to the retracted position of the outer wrapper is set to the crotch region C, and the diaper is located in the crotch region C. The area on the ventral side of the wearer is the ventral area A, and the area on the back side of the wearer's lower area C is the back side area B. The retracted position refers to a region in which the outer wrap is retracted from the both sides in the Y direction toward the center in the width direction (the X direction described below), and the width of the outer wrap is narrowed, and the region is set as the underarm region C. . Here, the outer packaging system refers to a sheet on the outermost side of the non-skin side of the diaper, and generally refers to a non-woven fabric disposed on the outer side of the liquid-impermeable film sheet, and is not provided with the non-woven fabric but only liquid. In the case of a film of properties, the film is considered to be an outer envelope. The film sheet is the same size as the non-woven fabric or a non-woven fabric as an outer casing. Further, in the front side portion A and the back side portion B, the outer covering body protrudes in the width direction from the crotch portion C and has a wide width. Further, 2) in the case where the side portion of the outer covering body is formed linearly in the longitudinal direction (Y direction), and the diaper for the side sheet for fixing is provided on both sides of the back side, the area including the side sheet is set as the back In the side region B, a portion corresponding to the ventral side of the length of the side panel, that is, a portion where the side panels overlap when worn, is a ventral region A, and the back side is The area B and the ventral area A are set as the underarm area C. In the case where the diaper of the region cannot be discriminated according to the above 1) and 2), the ventral side of the wearer when the diaper is divided into three in the longitudinal direction in the diaper unfolded state is referred to as the ventral side. In the region A, the back side is defined as the back side region B, and the underarm region between the ventral side and the back side is referred to as the underarm region C.

When the diaper 1 is described in detail, the absorbent body 5 of the diaper 1 is in the longitudinal direction in the extended state as shown in FIG. 1 (hereinafter, also referred to as "Y direction", Y direction: finger and center line). The direction in which the CL is parallel includes the ventral region A, the underarm region C, and the dorsal region B. The ventral side A, the crotch portion C, and the back side portion B are in a state in which the diaper 1 is stretched, and a region corresponding to the retracted position of the outer wrapper is set as the crotch region C, and is placed closer to the crotch region. The area on the ventral side is the ventral area A, and the area on the back side of the wearer in the lower squat area is referred to as the back side area B (the reason is that the diaper corresponding to the classification of the above (1)) . In addition, the direction orthogonal to the longitudinal direction (Y direction) is described as the width direction of the diaper 1 (hereinafter, also referred to as "X direction"). In the present specification, the term "skin-facing surface" refers to the surface of the front and back surfaces of the members constituting the diaper 1 such as the front sheet 2, which are disposed on the skin side of the wearer during wearing, and the so-called "non-skin pair" The "face" refers to a surface on the front and back sides of each member such as the front sheet 2 that faces the side opposite to the skin side of the wearer when worn.

As shown in Fig. 1, the left and right side edges of the diaper 1 in the front side region A and the left and right side edges of the back side region B extend outward in the width direction (X direction) from the left and right side edges of the crotch region C, respectively. Further, the left and right side edges of the crotch region C are curved in an arc shape toward the inner side in the width direction (X direction), and have a shape in which the central portion in the longitudinal direction (Y direction) is inwardly contracted toward the inside.

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 absorbent body 4 which are long in the longitudinal direction (Y direction). As shown in Fig. 1, the front sheet 2 has the same dimension in the longitudinal direction (Y direction) as the longitudinal direction (Y direction) of the back sheet 3, but as shown in Fig. 2, the width direction (X direction) The size is smaller than the width direction (X direction) of the back sheet 3. Front sheet 2 and back sheet 3 points The extensions extending outward from the periphery of the self-absorbent body 4 are joined to each other directly or by inserting other members, and the absorber 4 is sandwiched and fixed. The absorber 4 includes an absorbent core 41 in which particles of a water-absorbent polymer are held by an aggregate of fibers such as pulp fibers, and a core sheet 42 coated with the absorbent core 41. The absorbent core 41 of the absorbent body 4 and the topsheet 2 will be described in detail below.

As shown in FIG. 1 and FIG. 2, each of the both sides of the diaper 1 along the longitudinal direction (Y direction) includes a sheet 36 for forming a three-dimensional gather for elastic members 61 that are fixed in a state of being elongated in the Y direction. And being fixed to the side of the front sheet 2, thereby forming a pair of three-dimensional pleats 6, 6 (refer FIG. 2). Further, as shown in FIG. 1 and FIG. 2, the leg elastic members 63 for forming the leg gathers are disposed in a state of being elongated in the Y direction, respectively, on both sides in the longitudinal direction (Y direction) of the diaper 1. The leg gathers are formed by the contraction of the leg elastic members 63. Further, although not shown, the waist elastic member for forming the waist gather may be disposed in the longitudinal direction (Y direction) end portion on the side of the back side region B of the diaper 1 in a state of being elongated in the X direction, by the waist portion. The elastic member contracts to form a waist fold.

As described above, the diaper 1 is a so-called unfolded diaper, and as shown in Fig. 1, a pair of fastening tapes 7, 7 are provided on the left and right side edges of the back side region B, on the outer surface of the ventral region A ( The non-skin facing surface is provided with a fixing band 8 for fixing the fastening tapes 7, 7.

In the present embodiment, the absorbent core 4 includes the absorbent core 41, and the absorbent core 41 includes a space portion 41s in which the pulp constituting the absorbent core 41 is not present as shown in Figs. 1 and 3 . The space portion 41s of the absorbent core 41 included in the diaper 1 is attached to the crotch region C, and the both sides of the self-absorbent core 41 along the longitudinal direction (Y direction) are convex toward the center line CL toward the inside. It is formed in the shape of an arc without a pulp. Further, the absorbent core 41 included in the diaper 1 includes the space portion 41s formed without the pulp, but may include a low basis weight portion in which a plurality of pulps are laminated and the basis weight of the pulp is relatively low, instead of the space portion 41s. In the case of including a low basis weight portion, the basis weight of the low basis weight portion is preferably lower as compared with other portions. Specifically, the ratio of the low basis weight portion to the high basis weight portion is 70% or less, and thus If you are less than 50%, you can get Should be satisfactory enough. The absorbent body 4 included in the diaper 1 is formed by covering the absorbent core 41 formed in an arc-shaped space portion 41s which is formed to protrude inward by a single sheet of the core material 42.

When the front sheet 2 is described in detail, the front sheet 2 includes a fluffy non-woven fabric. Further, at least two of the front sheet 2 except the back side region B are disposed on both side portions 5s and 5s of the absorbent body 5 along the longitudinal direction (Y direction) as shown in Figs. 1 and 4 . The apparent density is lower than the fluffy region 9L of the portion 9h having the highest apparent density among the central portions 5m of the crotch region C. In the diaper 1 of the present embodiment, as shown in FIG. 1, the fluffy region 9L is disposed not only in the back side region B but also in the crotch region A, and is disposed in the crotch region C. The central portion 5m is a portion including the center line CL and extending along the center line CL (the length in the X direction) of about 70 mm in a state where the diaper 1 is stretched, and the both side portions 5s and 5s are under the diaper 1 A portion of the narrowest portion in the width direction (X direction) of the region C is located outside the center portion 5m in the width direction (X direction). The side portions 5s, 5s and the central portion 5m extend over the abdominal region A to the back region B of the absorbent body 5, that is, the entire region in the longitudinal direction (Y direction). The portion 9h having the highest apparent density may be within the region T of the central portion 5m of the crotch region C, and is determined by cutting out a portion of the range of 4 cm ² as follows. The determination of the apparent density will be described in detail below.

<Method for measuring apparent density>

The portion 9h having the highest apparent density is first cut in the thickness direction from the region T of the central portion 5m of the crotch region C of the front sheet 2, and the portion of the range of 4 cm ² is cut. The portion cut from the region T of the front sheet 2 is a central portion in the region T of the front sheet 2, a portion of the back side region B in the region T, and a portion of the region T in the front side region A. Then, using a KEYENCE VHX-1000 digital microscope, the thickness of each cut surface was measured at a magnification of 20 to 100 times and no load. Then, the basis weight of each of the cut portions was divided by the measured apparent thickness, and each apparent density was measured. Then, the apparent density of the central portion in the region T of the front sheet 2, the apparent density of the portion of the backrest side region B in the region T, and the median density of the portion of the region T in the region of the ventral region A are the highest. The portion is set to the portion 9h having the highest apparent density among the central portions 5m of the crotch region C. Further, when there is no difference in the apparent density between the central portion in the region T of the front sheet 2, the portion of the backrest side region B in the region T, and the portion of the region T in the region of the ventral region A The average value of these is set to the apparent density of the highest apparent density of 9h.

The apparent density of the fluffy region 9L was cut in the thickness direction, and the portion of the range of 4 cm ^{2 was} cut from the fluffy region 9L, and the apparent density was measured in the same manner as the portion 9h having the higher apparent density.

A pair of fluffy regions 9L and 9L are disposed on the front sheet 2 of the diaper 1, and all of the regions other than the pair of fluffy regions 9L and 9L have a higher apparent density 9h, and the portion having a higher apparent density 9h Uniform density. The total area of the pair of fluffy regions 9L and 9L is preferably 5 cm ² or more, more preferably 30 cm ² or more, and further preferably 150 cm ² or less, further preferably 60 cm ² or less, and more specifically, preferably 5cm ² or less than ² 150cm, and further ^more preferably ² or less 30cm 60cm.

The apparent density of the portion having a higher apparent density of 9 hours is preferably 0.02 g/cm ³ or more, more preferably 0.03 g/cm ³ or more, and further preferably 0.1 g/cm ³ or less, and further preferably 0.07 g. /cm ³ or less, more specifically, it is preferably 0.02 g/cm ³ or more and 0.1 g/cm ³ or less, and more preferably 0.03 g/cm ³ or more and 0.07 g/cm ³ or less.

The apparent density of the fluffy region 9L is preferably 0.008 g/cm ³ or more, more preferably 0.02 g/cm ³ or more, and is preferably 0.05 g/cm ³ or less, more preferably 0.04 g/cm ³ or less. More specifically, it is preferably 0.008 g/cm ³ or more and 0.05 g/cm ³ or less, and more preferably 0.02 g/cm ³ or more and 0.04 g/cm ³ or less.

From the viewpoint of preventing side leakage, the apparent density of the fluffy region 9L is lower than the apparent density of the portion having the higher apparent density of 9 hours, preferably 0.8 times or less of the apparent density of the portion having the higher apparent density of 9 hours, and further Good is 0.5 times or less.

In the present embodiment, the space is included in the absorbent core 41 constituting the absorbent body 4. A fluffy region 9L is disposed at a position corresponding to the intermediate portion 41s or the low basis weight portion. Specifically, when the diaper 1 is viewed as shown in FIG. 1, the fluffy region 9L having a shape similar to the contour is disposed in the range of the contours of the space portions 41s and 41s on both side portions of the absorbent core 41. In the diaper 1, a pair of fluffy regions 9L and 9L are disposed corresponding to the pair of space portions 41s and 41s. In other words, the space portion 41s of the absorbent core 41 is formed in an arc shape that protrudes inward from the side edge of the absorbent core 41 along the longitudinal direction (Y direction) toward the center line CL, and the space portion 41s Similarly, the fluffy region 9L of the front sheet 2 is formed in an arc shape which is convex toward the inner side from the side edge of the front sheet 2 along the longitudinal direction (Y direction) toward the center line CL.

In the diaper 1, as shown in FIG. 1, the side of the outline of the fluffy region 9L is disposed on the innermost side 90 so as to be curved inwardly to form a pair of fluffy regions 9L, 9L. One side 90, 90 are opposite each other. That is, the shape of one of the diapers 1 to the fluffy regions 9L and 9L is formed to be bilaterally symmetrical with respect to the center line CL.

As shown in FIG. 2 and FIG. 4, the front sheet 2 of the diaper 1 includes a fluffy non-woven fabric having a plurality of convex portions 21 that are raised toward the skin facing surface side and concave portions 22 that are recessed adjacent to the convex portions 21. Concave structure. The front sheet 2 has a structure in which the facing side of the skin has an undulation, and the non-skin facing side becomes flat. The front sheet 2 of the diaper 1 includes a first layer 23 and a second layer 24 of a sheet. The first layer 23 constitutes the skin facing surface of the topsheet 2, and the second layer 24 constitutes the non-skin facing surface of the topsheet 2. The first layer 23 is formed with a plurality of convex portions 21 which are bulged toward the skin facing surface side and which are hollow inside, and a concave portion 22 is formed between the convex portions 21 . Further, the second layer 24 has a planar shape. Further, in the recess 22, the first layer 23 and the second layer 24 are joined via a joint portion (not shown). The recessed portion 22 has a joint portion (not shown) and a non-joining portion that surrounds 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 sheet is substantially non-stretchable. The material of the sheet material can be used without any particular limitation as long as it is substantially non-stretchable in the material used in the previously known diaper. For example, non-woven fabric, spunbonded non-woven fabric, melt-blown non-woven fabric, water needle non-woven fabric, and needle rolling manufactured by the carding method can be cited. Non-woven fabrics such as non-woven fabrics. Further, a film or the like which can permeate a liquid by an opening mechanism can also be used. When a nonwoven fabric is used as the sheet material, the fineness of the constituent fibers is 1 dtex or more, preferably 1.5 dtex or more, and is 20 dtex or less, preferably 5.6 dtex or less, and more specifically 1 dtex or more and 20 dtex or less. In terms of ensuring the strength of the front sheet 2 and improving the touch of the skin, it is particularly preferably 1.5 dtex or more and 5.6 dtex or less.

In the front sheet 2 of the diaper 1, the convex portion 21 is surrounded by four concave portions 22 including joint portions (not shown) as shown in Fig. 4, and the bottom surface thereof is rectangular in plan view. Further, the convex portion 21 as a whole has a rectangular parallelepiped or a truncated quadrangular pyramid having a curvature of a ridge. On the other hand, the recess 22 also has a rectangular shape in plan view. Further, in the front sheet 2 of the diaper 1, the convex portion 21 is surrounded by four joint portions (not shown) (recessed portions 22), but may be joined by more than four joint portions (not shown) (recessed portion 22) In particular, the convex portion is surrounded by six concave portions including a joint portion (not shown) (not shown). Further, the convex portion as a whole is a rectangular parallelepiped or a frustum having a curvature of a ridge.

The convex portion 21 and the concave portion 22 are attached to the front sheet 2 of the diaper 1, and as shown in Fig. 4, rows which are alternately arranged in the longitudinal direction (Y direction) are formed, and the rows are arranged in the width direction (X direction). Multi-line. When focusing on any one of the above-described convex portions 21, the convex portion 21 is not present at a position adjacent to the one convex portion 21 in the left and right rows adjacent to the row in the width direction (X direction). In other words, in the two rows adjacent in the width direction (X direction), the joint portion (not shown) (the recess portion 22) is disposed in the longitudinal direction (Y direction) by a half pitch. Therefore, when focusing on any one of the joints (not shown) (concave portion 22), the one joint portion (not shown) (the recess portion 22) is closed by the front and rear sides and the left and right sides surrounded by the convex portion 21. Depression. In other words, when the front sheet 2 is viewed from the side of the first layer 23, the joint portion (not shown) (the recess portion 22) is arranged in a zigzag lattice shape, and the convex portion 21 is also arranged in a zigzag lattice shape.

In the front sheet 2 of the diaper 1, the basis weight of the fluffy region 9L is the same as the basis weight of the portion 9h having the highest apparent density in the central portion 5m of the crotch region C, and includes the front surface of the first layer 23 and the second layer 24. The basis weight of the sheet 2 as a whole is uniform. The basis weight of the entire front sheet 2 is preferably 15 g/m ² or more, more preferably 20 g/m ² or more, and further preferably 150 g/m ² or less, further preferably 60 g/m ² or less. Specifically, it is preferably 15 g/m ² or more and 150 g/m ² or less, and more preferably 20 g/m ² or more and 60 g/m ² or less.

The thickness of the fluffy region 9L, in particular, the height of the convex portion 21 of the front sheet 2 of the diaper 1 located in the fluffy region 9L is the thickness of the portion 9h which is the highest density, specifically the front sheet 2 of the diaper 1 The height of the convex portion 21 located in the region other than the fluffy region 9L is high. Further, the thickness is measured by the measurement method used in the above-described method for measuring the apparent density.

The thickness of the fluffy region 9L is preferably 0.5 mm or more, more preferably 1 mm or more, further preferably 5 mm or less, further preferably 4 mm or less, and more specifically, preferably 0.5 mm or more and 5 mm or less. It is preferably 1 mm or more and 4 mm or less.

The apparent thickness of the portion having a higher apparent density of 9h is preferably 0.3 mm or more, more preferably 0.5 mm or more, and further preferably 3 mm or less, further preferably 2 mm or less, and more specifically, preferably 0.3. Mm or more is 3 mm or less, and further preferably 0.5 mm or more and 2 mm or less.

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

Moreover, when the diaper 1 is seen as shown in FIG. 1, the maximum width W1 of the bulky region 9L is formed to be wider 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. Further, the width W2 of the convex portion 21 indicates the dimension of the bottom portion of the convex portion 21 along the X direction.

The maximum width W1 of the fluffy region 9L is preferably 2 mm or more, and further preferably 5 mm. The above is preferably 50 mm or less, more preferably 20 mm or less, and still more preferably 2 mm or more and 50 mm or less, and further preferably 5 mm or more and 20 mm or less.

The width W2 of the convex portion 21 located in the fluffy region 9L is preferably 1 mm or more, more preferably 2 mm or more, and further preferably 30 mm or less, further preferably 5 mm or less, and more specifically, preferably 1 mm or more and 30 mm. Hereinafter, it is more preferably 2 mm or more and 5 mm or less. Further, in the front sheet 2 of the diaper 1, the width of the convex portion 21 located in the region other than the fluffy region 9L is also the same as the width W2 of the convex portion 21 located in the fluffy 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 wider than the width W2 of the non-woven fabric portion 21 of the uneven structure of the front sheet 2 in the fluffy region 9L. From the viewpoint of further improving the side leakage prevention, it is preferable that the width W2 of the non-woven fabric portion is twice or more, and more preferably five times or more.

In the front sheet 2 of the diaper 1, the length L1 of the convex portion 21 located in the fluffy region 9L in the Y direction is the same as the length of the convex portion 21 located in the region other than the fluffy region 9L. In addition, the length L1 of the convex part 21 shows the dimension of the bottom part of the convex part 21 along the Y direction.

The length L1 of the convex portion 21 is preferably 1 mm or more, more preferably 2 mm or more, further preferably 30 mm or less, further preferably 5 mm or less, and more specifically, preferably 1 mm or more and 30 mm or less, and further preferably It is 2 mm or more and 5 mm or less.

The method for producing the diaper 1 of the present embodiment is not particularly limited, and it can be produced by any method. Hereinafter, a preferred embodiment of the method of manufacturing the diaper 1 of the present embodiment will be described with reference to Fig. 5 .

As shown in FIG. 5, it is performed using the pressure roller 100. The pressure roller 100 includes a first roller 102 having a concave portion 101 formed by forming one pair of the pair of bulk regions 9L on the circumferential surface, and a second roller 103 having a flat circumferential surface. One of the first rolls 102 is formed in a position corresponding to one of the pair of space portions 41s, 41s or the low basis portion included in the absorbent core 41 constituting the absorber 4, and is formed in the space portion. The contour of the 41s or low basis weight is similar in shape. Furthermore, the concave part The depth of the recess of 101 is deeper than the height of the convex portion 21 of the front sheet 2.

First, as the front sheet 2 of the diaper 1, for example, a front sheet described in Japanese Laid-Open Patent Publication No. 2004-174234 of the applicant's prior application is used.

Further, as the absorbent core 41 of the diaper 1, an absorbent core body in which a pair of space portions 41s, 41s or a low basis weight portion are formed by vacuuming according to a conventional method is used. The absorber 4 of the diaper 1 is formed by covering the absorbent core 41 including the pair of space portions 41s and 41s or the low basis weight portion by using one sheet of the core material 42.

Next, the strip-shaped front sheet 2 and the strip-shaped back sheet 3 are fixed in such a manner as to sandwich a plurality of absorbers 4, 4, which are intermittently supplied in the conveying direction, according to a conventional method, and are carried along the belt. Each of the both sides of the conveying direction of the front sheet 2 is fixed in a state in which the leg elastic members 63 are elongated in the conveying direction according to a conventional method. Moreover, on the upper surface side of the strip-shaped front sheet 2 (the side on which the plurality of convex portions 21 are arranged), the both sides of the strip-shaped front sheet 2 in the transport direction are each according to a conventional method. The strip-shaped three-dimensional pleat-forming sheet 62 is fixed to the inner side in the width direction of each of the three-dimensional pleat-forming sheets 62, and the elastic member 61 for forming the three-dimensional pleats is fixed in a state of being elongated in the transport direction.

The continuous body 104 of the disposable diaper 1 formed as described above is such that the upper surface side of the strip-shaped front sheet 2 (the side on which the plurality of convex portions 21 are disposed) faces the first roll 102 of the pressure roll 100 The method is carried between the first roller 102 and the second roller 103. Then, the continuous body 104 of the disposable disposable diaper 1 is pressed by a portion other than the pair of concave portions 101 of the first roller 102, whereby the height of the convex portion 21 is lowered, and the concave portion 21 is lowered and located in a pair of concave portions The height of the convex portion 21 of the region corresponding to 101 is maintained as it is. Thus, the convex portion 21 has the convex portion at the pair of concave portions 101 as it is located, and the convex portion 21 is located at the convex portion 21 of the pair of the fluffy regions 9L, 9L. The height of the convex portion 21 is formed lower than the pair of concave shapes. The convex portion in the region other than the portion 101 becomes the convex portion 21 located in a region other than the pair of the fluffy regions 9L, 9L (the portion 9h having the higher apparent density). Through the above steps, the continuum 105 of the disposable diaper 1 including the strip-shaped front sheet 2 including the pair of fluffy regions 9L and 9L intermittently in the conveyance direction is obtained, and is utilized. The cutting mechanism of the disposable diaper 1 is cut by a known cutting mechanism, and the disposable diaper 1 is continuously obtained. Further, when the first roller 102 and the second roller 103 of the pressure roller 100 are pressed, they can be heated or pressed at normal temperature.

Further, in the above-described manufacturing method of the disposable diaper 1 including the pair of fluffy regions 9L and 9L, the continuum 104 of the disposable diaper 1 is first manufactured, and then the first roller 102 and the second roller 103 of the pressure roller 100 are pressed. For example, the first roller 102 and the second roller 103 of the pressure roller 100 may be used to press only the strip-shaped front sheet 2, and the strip-shaped front surface of the pair of fluffy regions 9L and 9L may be intermittently arranged in the transport direction. Sheet 2. Specifically, the strip-shaped front sheet 2 which is formed so as to intermittently include the pair of fluffy regions 9L and 9L may be disposed so as to absorb the plurality of absorbers 4 which are intermittently supplied in the transport direction. The core body 41 includes a position corresponding to the space portion 41s, 41s or the low basis weight portion, and the continuous body 105 of the disposable diaper 1 is formed in the above manner, and the disposable diaper 1 is formed by a known cutting mechanism. The continuous body 105 is cut, whereby the disposable diaper 1 is continuously manufactured.

The material for forming the disposable diaper 1 of the present embodiment will be described.

The back sheet 3 and the three-dimensional pleat forming sheet 62 are usually used without any particular limitation as long as they are used in an absorbent article such as a disposable diaper. For example, as the back sheet 3, a resin film, a laminate of a resin film and a non-woven fabric, or the like can be used. As the three-dimensional pleat-forming sheet 62, a stretchable film, a nonwoven fabric, a woven fabric, or the like can be used.

The fastening tape 7 is generally used without any particular limitation as long as it is a user of an absorbent article such as a disposable diaper. For example, "Magic Tape (registered trademark)" (manufactured by Kuraray Co., Ltd.), "QUICKLON (registered trademark)" (manufactured by YKK Co., Ltd.), "Magicloth (registered trademark)" (manufactured by Kanebo Bell-Touch Co., Ltd.), etc. can be used. Male components, etc.

As the absorbent core 41 constituting the absorbent body 4, a mixture of fibers such as pulp fibers can be used to hold particles of the absorbent polymer. As a covering material constituting the absorbent body 4 42, a coated sheet material containing a hydrophilic sheet such as water permeable tissue paper (toilet paper) or water permeable non-woven fabric can be used.

As the elastic member 61 for forming the three-dimensional pleats, the leg elastic member 63, and the waist elastic member, natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-poly can be used. A linear stretchable material such as a butadiene copolymer or a polyethylene-α-olefin copolymer such as ethyl acrylate-ethylene.

The adhesive for fixing the members is usually used without any particular limitation as long as it is a user of an absorbent article such as a disposable diaper. For example, a hot-melt adhesive can be used. As the hot-melt adhesive, for example, styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butyl A block fusion polymer such as an ene-styrene copolymer (SEBS) is a hot melt adhesive.

The effect of the disposable diaper 1 of the embodiment of the present invention described above will be described.

Since the diaper 1 type front sheet 2 is formed of a fluffy non-woven fabric, the cushioning property at the time of wearing is good, and the moisture absorption after the body fluid absorption is small, and the feeling of use is good. Further, as shown in FIG. 1, the diaper 1 is provided with a pair of fluffy regions 9L and 9L in a portion other than the back side region B of the front sheet 2. Therefore, for example, softness is easily applied to the back side region in the back side region B. B spreads in the width direction (X direction), and is easy to diffuse sufficiently in the back side region B. Therefore, the amount of soft stool which is diffused to the crotch region C through the central region 5m can be suppressed, and the soft stools diffused to the crotch region C can be suppressed by the pair of fluffy regions 9L and 9L to further improve the side leakage prevention property of the soft stool.

Further, in the diaper 1, the absorbent core 41 constituting the absorbent body 4 includes a pair of space portions 41s and 41s as shown in Fig. 3, and corresponds to the pair of space portions 41s and 41s as shown in Fig. 1 . The position is provided with a pair of fluffy areas 9L, 9L. Therefore, for example, soft stools blocked by the fluffy regions 9L and 9L are easily absorbed into the absorbent core 41 via the pair of space portions 41s and 41s, and the side leakage preventing property of the soft stool can be further improved.

Further, the diaper 1 is as shown in Fig. 1, and the fluffy region 9L is disposed not only in the back side region B but also in the crotch region A, and is disposed in the crotch region C. Therefore, even if the diaper 1 in a state of being pressurized by the packaging is taken out and used, the volume of the bulky region 9L can be maintained, and the side leakage prevention property of the soft stool can be further improved.

In the diaper 1 in which the fluffy region 9L is disposed only in the crotch region C, as described in the preceding paragraph, the volume of the fluffy region 9L can be maintained, and the apparent density in the crotch region C can be formed by folding and packaging. The state of the lower front sheet 2 is maintained. Therefore, even if the packaged diaper 1 is taken out and used, the volume of the bulky area 9L can be maintained, and the wrinkles generated in the absorbent article such as a diaper can be reduced, and the side of the absorbent article such as a diaper can be removed. The degree of oozing out (causing leakage), discomfort during wearing, or scratching is reduced.

In the above-described manufacturing method of the diaper 1 using the pressure roller 100, the treatment of the front sheet 2 in the crotch region C is preferably improved from the fluffy region 9L from the viewpoint of stabilizing the state in which the density is formed low. The state of fusion of the fibers of the sheet 2 (increasing the amount of fusion or the point of fusion), but generally causes a decrease in texture. Therefore, in general, it is considered that the texture (softness) is maintained by the treatment of the concave portion (absorbent side) of the uneven structure or the treatment at a relatively low temperature, but it may be difficult to achieve stability and the effect may be lowered. Further, depending on the configuration of the absorbent article, it is difficult to maintain the fluffy second sheet and the absorbent body in a state where the density is low, and the effect is lowered.

However, in the diaper (absorbent article) of the present invention, in the case of folding or tri-folding, the underarm region C has a shape in which the absorbent bodies are opposed to each other or to a different region (back side or ventral side) from each other. fold. Further, since the wrinkles due to the folding are small, it is difficult to form a gap, and the folded shape is stabilized, and the front sheet 2 is stably sandwiched, and the state in which the density is low is easily maintained. In particular, a front sheet of a core-sheath structure fiber (core component such as polyester or polypropylene) using polyethylene as a sheath component is relatively low in temperature of 60 to 90 ° C, preferably 65 to 80 ° C. In the process of the state, the front sheet 2 is also stably sandwiched, and it is easy to maintain. The state of low density has a stable effect for a long time.

As a configuration of the absorbent article such as a diaper which exhibits a stabilizing effect, a general configuration can be used depending on the stabilizing effect of the folded shape, but the central portion is formed such that the thickness of the absorbent body gradually decreases from the central portion toward the lateral periphery. The shape of the absorber is slightly thicker, and the area where the adhesion is improved is formed, and the effect can be improved.

Further, when the adhesive is disposed partially between the front sheet 2 and the absorbent body 4, or the absorbent body surface side of the front sheet has a partial convex structure, the fixing property can be locally improved and the stability can be improved.

The folding of the absorbent article such as a diaper stabilizes the folding property by the absorption faces facing each other, and the compression of the front sheet 2 is uniformized by the overlapping portion of the absorbent body 4, and the front sheet 2 in the crotch region C is maintained relatively fluffy. The density of the portion of the region 9L is high, and in addition to the above functions, a new effect of stably obtaining a smooth feeling and no discomfort is provided.

Further, when the absorbent article such as the folded diaper is placed in a state of being overlapped by the packaging, it is easy to obtain an effect for a longer period of time, and the stability is improved as compared with the case of the individual. Regarding this effect, as long as a plurality of states are superimposed, the effect is exhibited even if the package is unsealed.

Further, as shown in FIG. 2 and FIG. 4, the diaper 1 includes a fluffy non-woven fabric having a concave-convex structure including a plurality of convex portions 21 and concave portions 22. Therefore, it is easy to form a fluffy region 9L, and the feeling of use is improved. Further improvement, and further improve the side leakage prevention of soft stools.

Moreover, as shown in FIG. 2 and FIG. 4, the front sheet 2 of the diaper 1 has a viewing thickness of the loft area 9L which is higher than the apparent thickness of the portion 9h in which the viewing density is the highest in the central portion 5m of the crotch region C, so that it is easy. In the underarm region C, the soft stool which spreads in the width direction (X direction) is blocked, and the side leakage prevention property of the soft stool can be further improved.

Further, the diaper 1 is formed so as to be symmetrical with respect to the center line CL, and one of the sides 90, 90 of the fluffy regions 9L, 9L oppose each other, and is formed as an arc that protrudes toward the inside. The shape is such that the diffusion width of the soft stool is narrowed toward the central portion of the underarm region C. Therefore, the soft excretion in the back side region B is easily diffused toward the central portion of the crotch region C through the central region 5m, and the side leakage prevention property of the soft stool can be further improved.

Further, as shown in Fig. 1, the diaper 1 has a maximum width W1 of the bulky region 9L which is formed wider than the width W2 of the convex portion 21 of the front sheet 2 in the fluffy region 9L. Therefore, even if the diaper 1 in a state of being pressurized by the packaging is taken out, the shape of the convex portion 21 of the fluffy region 9L can be maintained, and the side leakage preventing property of the soft stool can be further improved.

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

For example, in the disposable diaper 1 of the above embodiment, as shown in Figs. 1 and 3, the absorbent core 41 of the absorbent body 4 is attached to the crotch region C, and includes the self-absorbent core 41 along the longitudinal direction. The both side edges of the (Y direction) are the space portion 41s formed by the lack of pulp in an arc shape protruding toward the center line CL toward the center line CL, or the low basis weight portion formed by lowering the basis weight of the pulp. Alternatively, instead of the shape of the space portion 41s or the low basis weight portion of the absorbent core 41, as shown in FIG. 6, the space portion 41s or the low basis weight portion is located in the crotch region C in the absorbent core 41. The both side edges along the longitudinal direction (Y direction) are further inside, and the shape thereof is formed in an arc shape convex toward the inner side toward the center line CL.

Further, as shown in FIG. 7, the space portion 41s or the low basis weight portion may include the first space portion 41s1 and the second space portion 41s2. Specifically, in the crotch region C, the first space portion 41s1 is formed in an arc shape that protrudes inward from the both side edges of the absorbent core 41 along the longitudinal direction (Y direction) toward the center line CL. Further, the second space portion 41s2 is located on the inner side of the arc-shaped top portion of the first space portion 41s1 and formed in a pair of rectangular shapes.

Further, as shown in FIG. 8, the space portion 41s or the low basis weight portion may include the first space portion 41s1 and the third space portion 41s3. Specifically, in the crotch region C, the first space portion 41s1 is located on the inner side of the both sides of the absorbent core 41 in the longitudinal direction (Y direction), and its shape is formed toward the inner side toward the center line CL. a convex arc shape, and the third space portion 41s3 is located The arc-shaped tops of the adjacent first space portions 41s1 are formed in a rectangular shape in the middle of each other. Further, the rectangular third space portion 41s3 is as shown in Fig. 8, and the end portion on the side of the back side region B is disposed on the back side region of each of the first pair of arc-shaped first space portions 41s1 and 41s1. The end of the B side is further to the ventral region A.

Further, as shown in FIG. 9, the space portion 41s or the low basis weight portion may be on both sides in the longitudinal direction (Y direction) of the absorbent core 41, and the lower portion C from the back side region B. The portion is formed in a straight line shape through the entire area of the crotch region C to the entire region of the ventral region A.

Further, in the disposable diaper 1 of the above-described embodiment, as shown in Figs. 1 and 4, the bulky portion 9L of the front sheet 2 is disposed in the space portion 41s included in the absorbent core 41 constituting the absorbent body 4. Or the position corresponding to the low basis weight, but it may not be configured correspondingly.

Further, in the disposable diaper 1 of the above-described embodiment, when the shape of the space portion 41s or the low basis weight portion of the absorbent core 41 constituting the absorbent body 4 is as shown in FIG. As shown in FIGS. 1 and 4, the fluffy region 9L of the sheet 2 is disposed at a position corresponding to the space portion 41s or the low basis weight portion. However, for example, the shape of the space portion 41s or the low basis weight portion is the above-described FIG. In the case of the shape shown, the fluffy region 9L of the front sheet 2 may also be similar to the shape of one of the pair of space portions 41s, 41s or the low basis weight shown in Fig. 6 in the underarm region as shown in Fig. In C, the absorbent core 41 has an inner side along both sides in the longitudinal direction (Y direction), and its shape is formed in an arc shape convex toward the inner side toward the center line CL.

Further, for example, when the space portion 41s or the low basis weight portion includes the first space portion 41s1 and the second space portion 41s2 and is in the shape shown in FIG. 7, the front sheet 2 is formed on both side portions 5s and 5s. As shown in FIG. 11, the fluffy region 9L may include a pair of first fluffy regions 9La and 9La and further include a pair of central fluffy regions 9Lb and 9Lb between the pair of first fluffy regions 9La and 9La. Specifically, the fluffy region 9L of the front sheet 2 is similar in shape to the pair of space portions 41s (the first space portion 41s1 and the second space portion 41s2) shown in FIG. 7, and is formed on both sides of the crotch region C. In the 5s and 5s, the pair of first fluffy regions 9La and 9La are formed from the side edges along the longitudinal direction (Y direction) of the front sheet 2 toward the center line CL to form an arc that protrudes toward the inside. And a pair of first fluffy regions 9La and 9La and a pair of central fluffy regions 9Lb and 9Lb are located further inside the top of the arc-shaped fluffy region 9La, and are formed in a rectangular shape that is long in the Y direction. shape. In this case, the pair of central fluffy regions 9Lb and 9Lb are as shown in FIG. 11, and the end portions on the side of the back side region B are disposed on the back side region B of each of the pair of arcuate fluffy regions 9La and 9La. The end of the side is further to the ventral region A. Further, the fluffy region 9L of the front sheet 2 may be one of the pair of space portions 41s and 41s of the pair of space portions 41s (the first space portion 41s1 and the second space portion 41s2) shown in Fig. 7 (first The shape of the space portion 41s1 or the second space portion 41s2) is similar. For example, the shape of one of the pair of space portions 41s (the first space portion 41s1 and the second space portion 41s2) shown in FIG. 7 may be similar to the shape of the pair of space portions 41s and 41s (the second space portion 41s2). As shown in Fig. 12, only a pair of central fluffy regions 9Lb and 9Lb are formed in a rectangular shape that is long in the Y direction.

Further, for example, when the space portion 41s (the first space portion 41s1 and the third space portion 41s3) is in the shape shown in FIG. 8, the fluffy region 9L of the front sheet 2 may be included as shown in FIG. The pair of first fluffy regions 9La and 9La further include a second central fluffy region 9Lc between the pair of first fluffy regions 9La and 9La. Specifically, the fluffy region 9L of the front sheet 2 may be similar in shape to the three space portions 41s (the first space portion 41s1 and the third space portion 41s3) shown in FIG. 8, and in the underarm region C, The first fluffy regions 9La and 9La are located on the inner side of the longitudinal direction (Y direction) of the front sheet 2, and the shape thereof is formed in an arc shape convex toward the inner side toward the center line CL, and Further, between the pair of fluffy regions 9La and 9La, a second central fluffy region 9Lc is located further inside the top portion of the arcuate fluffy region 9La, and is formed in a rectangular shape that is long in the Y direction. In this case, the one second central fluffy region 9Lc is as shown in Fig. 13, and the end portion on the side of the back side region B is disposed on the side of the back side region B of each of the pair of arcuate fluffy regions 9La and 9La. The end portion is further to the ventral region A. When the second central fluffy region 9Lc is disposed in the abdomen region A of the pair of arcuate fluffy regions 9La and 9La, the soft stool discharged from the back side region B can be further prevented from diffusing from the crotch region C to the abdomen. Side area A, which can be further prevented from the ventral side Leakage.

Further, for example, when the shape of the space portion 41s or the low basis weight portion is the shape shown in FIG. 9, the fluffy region 9L of the front sheet 2 may be as shown in FIG. 14 and the space shown in FIG. The shape of the portion 41s or the low basis weight is similar to the both sides of the front sheet 2 along the longitudinal direction (Y direction), and the portion of the back side region B from the underarm region C passes through the underarm region C to The entire region of the ventral region A is formed in a straight line shape.

Moreover, in the disposable diaper 1 of the above-described embodiment, a fluffy non-woven fabric is used as the topsheet 2, and the nonwoven fabric includes the first layer 23 and the second layer 24 as shown in Figs. 2 and 4, and the first The layer 23 side has a concavo-convex structure in which a plurality of convex portions 21 which are bulged toward the skin facing surface side and which are hollow inside are formed, and the concave portion 22 is formed between the convex portions 21, but instead of the non-woven fabric of the uneven structure, two The layered structure includes a fluffy nonwoven fabric having a concave-convex structure in which a plurality of convex portions are solid inside and a concave portion is included between the convex portions. As such a nonwoven fabric, for example, a front sheet described in Japanese Laid-Open Patent Publication No. 2002-187228, the entire disclosure of which is hereby incorporated by reference. In addition, a non-woven fabric having the above-described uneven structure composed of two layers may be used, and a bulky nonwoven fabric having a concave-convex structure including a plurality of convex portions that are raised toward the skin facing surface side and including a concave portion between the convex portions may be used. As such a non-woven fabric, for example, a front sheet described in Japanese Laid-Open Patent Publication No. 2012-136790, the entire disclosure of which is incorporated herein by reference.

Further, in the disposable diaper 1 of the above-described embodiment, as the topsheet 2, a plurality of convex portions 21 including only the skin facing surface side as shown in Figs. 2 and 4 are used, and between the convex portions 21 are used. In addition to the non-woven fabric of the concavo-convex structure of the concave portion 22, a plurality of convex portions including not only the skin facing surface side but also the non-skin opposing surface side may be used and the convex portion may be used. A fluffy non-woven fabric having a concave-convex structure of a concave portion between the portions. Examples of the uneven structure of the nonwoven fabric include a ridge structure in which the convex portion 21 is a ridge and the concave portion 22 is a groove. Furthermore, the convex portion 21 of the ridge becomes solid. When a non-woven fabric having a concave-convex structure composed of such a ditch is used, the soft stool discharged in the back side region B is easily expanded in the longitudinal direction (Y direction). Dispersion, and can further prevent leakage from the side of the underarm region C. The non-woven fabric of the concavo-convex structure composed of such a ditch is exemplified by the front sheet described in Japanese Laid-Open Patent Publication No. 2009-153937.

Further, the disposable diaper 1 of the above embodiment is an unfolded disposable diaper as shown in Fig. 1, but may be a pant-type disposable diaper or a menstrual sanitary napkin.

Regarding the above embodiment, the following absorbent article is further disclosed.

<1>

An absorbent article comprising a vertically long absorbent body comprising a liquid-permeable front sheet disposed on a skin facing surface side and a liquid-impermeable back surface disposed on a non-skin facing surface side a sheet and an absorber disposed between the two sheets, wherein the absorbent body is divided into a ventral region on the ventral side of the wearer when worn, a back side region on the back side, and a ventral side a crotch region between the region and the back side region, wherein the front sheet comprises a fluffy non-woven fabric, and the front sheet except the back side region is on both sides of the absorbent body along the longitudinal direction. At least one pair of fluffy regions having an apparent density lower than a portion of the central portion of the crotch region having the highest apparent density is disposed.

<2>

An absorbent article according to <1>, wherein the absorbent body comprises an absorbent core comprising a low basis weight having a relatively low basis weight of the pulp constituting the absorbent core, or not comprising The space portion of the pulp of the absorbent core is disposed at a position corresponding to the low basis weight portion or the space portion.

<3>

An absorbent article such as <1> or <2>, wherein the above-mentioned fluffy region does not exist on The ventral region is described and disposed in the underarm region.

<4>

The absorbent article according to any one of <1> to 3, wherein the front sheet comprises a fluffy non-woven fabric having a plurality of convex portions at least raised toward the opposite side of the skin and the convex portion The concave-convex structure of the concave portion adjacent to the recess.

<5>

The absorbent article according to <4>, wherein the uneven structure is a ridge 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 fluffy region is higher than the apparent thickness of the portion of the central portion of the underarm region having the highest apparent density.

<7>

The absorbent article according to any one of <1> to <6>, wherein the side of the inner side of the outline of the fluffy region in a plan view is formed in an arc shape which is convex toward the inner side, and the pair of fluffy members are formed. The one side of the area opposes each other.

<8>

The absorbent article according to any one of <4> to <7> wherein the maximum width of the bulky region in a plan view is wider than the width of the convex portion of the nonwoven fabric constituting the uneven structure of the front sheet in the bulky region.

<9>

The absorbent article according to any one of <1> to <8> wherein at least one central fluffy region is further disposed between the pair of fluffy regions, and an end portion of the central fluffy region on the side of the back side region is disposed at The end portion of the pair of fluffy regions on the side of the back side region is closer to the ventral region.

<10>

A disposable diaper which is an absorbent article of <1> to <9>.

<11>

The disposable diaper of the <10>, wherein the disposable diaper-expandable disposable diaper is provided with a pair of fastening tapes on the left and right side edges of the back side region, and the outer surface of the ventral region is provided with A fastening strap that is fastened to the fastening strip.

<12>

The disposable diaper of <10> or <11>, wherein the liquid-impermeable back sheet comprises a liquid-impermeable film and a package including a nonwoven fabric disposed outside.

<13>

A disposable diaper according to <12>, wherein the outer covering body has a retracted position, and the retracted position exists in the underarm region.

<14>

The disposable diaper according to any one of <10>, wherein the absorbent body comprises an absorbent core obtained by holding particles of a water absorbent polymer, and covering the absorbent core The package of chip material.

<15>

The disposable diaper according to any one of the above-mentioned disposable diapers, which comprises a sheet for forming a three-dimensional pleats of an elastic member which is fixed in an elongated state, in each of both sides in the longitudinal direction of the disposable diaper. The side surface of the front sheet is disposed and fixed, thereby forming a pair of three-dimensional pleats.

<16>

The disposable diaper according to any one of <10> to <15> wherein the leg elastic members for forming the leg gathers are disposed in an extended state on both sides of the disposable diaper along the longitudinal direction. And leg gathers are formed by contraction of the leg elastic members.

<17>

The disposable diaper according to any one of <10> to <16> wherein the base of the low basis weight of the absorbent core is lower than the other portions, and the ratio of the low basis weight to the high basis weight It is 70% or less, preferably 50% or less.

<18>

The disposable diaper according to any one of <10>, wherein the absorbing system is formed by coating a core material of an absorbent core formed in an arc shape convex toward the inside.

<19>

The disposable diaper according to any one of <10> to <18> wherein the front sheet of the disposable diaper is provided with a pair of fluffy regions, and all of the regions other than the pair of fluffy regions have a higher apparent density. In part, the density is uniform in the portion where the apparent density is high.

<20>

The disposable diaper according to any one of <10> to <18> wherein the total area of the pair of fluffy regions is 5 cm ² or more, preferably 30 cm ² or more, and is 150 cm ² or less, preferably 60 cm ^{2 .} the following.

<21>

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

<22>

The disposable diaper of any one of <10> to <20> wherein the above-mentioned fluffy region has an apparent density of 0.008 g/cm ³ or more, preferably 0.02 g/cm ³ or more, and is 0.05 g/cm ^{3 .} Hereinafter, it is preferably 0.04 g/cm ³ or less.

<23>

The disposable diaper according to any one of <10>, wherein the visual density of the fluffy region is lower than the apparent density of the portion having the higher apparent density, and the apparent density of the portion having the higher apparent density. 0.8 times or less, preferably 0.5 times or less.

<24>

The disposable diaper according to any one of <10>, wherein in the disposable diaper, the space portion of the absorbent core is oriented from a side edge of the absorbent core along a longitudinal direction toward the center The line is formed in an arc shape convex toward the inner side, and similar to the shape of the space portion, the fluffy region of the front sheet is also formed in an arc shape convex toward the inner side from the side edge of the front sheet along the longitudinal direction toward the center line. And one side of the side forming the contour of the fluffy region in plan view is formed in an arc shape convex toward the inner side, and the one side forming the pair of fluffy regions oppose each other, and the shape of the fluffy region is formed to be opposite to The center line is bilaterally symmetrical.

<25>

The disposable diaper according to any one of <10>, wherein the disposable diaper has a fluffy non-woven fabric having a plurality of convex portions that are raised toward the opposite side of the skin and The uneven structure of the concave portion of the concave portion adjacent to the convex portion is such that the front sheet has a structure having an undulation on the side of the skin facing surface, and the non-skin facing surface side is flat. Further, the front sheet includes the first sheet. In the layer and the second layer, the first layer constitutes the skin facing surface of the front sheet, the second layer 24 constitutes the non-skin facing surface of the front sheet, and the first layer forms a cavity that rises toward the opposite side of the skin and becomes hollow inside. The plurality of convex portions form a concave portion between the convex portions, and the second layer has a planar shape. In the concave portion, the first layer and the second layer are joined to each other.

<26>

The disposable diaper of <25>, wherein the first layer and the second layer comprise the same or different sheets, the sheet is substantially non-stretchable, and is a non-woven fabric, spunbonded by a carding method. Any of non-woven fabric, melt-blown nonwoven fabric, water jet non-woven fabric, and needle-punched nonwoven fabric, the fineness of the constituent fibers is 1 dtex or more, preferably 1.5 dtex or more, and is 20 dtex or less, preferably 5.6 dtex or less.

<27>

A disposable diaper such as <25> or <26>, wherein the disposable diaper is positive In the face sheet, the convex portion is surrounded by four or six concave portions including the joint portion, and the bottom surface thereof is flat, and the convex portion as a whole has a rectangular parallelepiped or a frustum having a ridge line.

<28>

The disposable diaper according to any one of <25>, wherein in the front sheet, the basis weight of the loft region is the same as the basis weight of the portion having the highest apparent density in the central portion of the underarm region, and includes The basis weight of the entire front sheet of the first layer and the second layer is uniform, and the basis weight of the entire front sheet is 15 g/m ² or more, preferably 20 g/m ² or more, and is 150 g/m ² or less. It is preferably 60 g/m ² or less.

<29>

The disposable diaper according to any one of <10>, wherein the bulky portion of the front sheet has a thickness of 0.5 mm or more, preferably 1 mm or more, and 5 mm or less, preferably 4 mm or less. The apparent thickness of the portion having the higher 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 front sheet, the apparent thickness of the fluffy region is higher than the apparent thickness of the portion having the higher apparent density, and is higher than the apparent density. The total thickness of the height portion and the thickness of the absorber is 1.2 times or more, preferably 1.6 times or more, the apparent thickness of the portion having the higher 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 to be larger than the convex portion of the non-woven fabric constituting the uneven structure of the front sheet in the fluffy region. The width of the bulky region is 2 mm or more, preferably 5 mm or more, and is 50 mm or less, preferably 20 mm or less, and the width of the convex portion located in the bulky region is 1 mm or more, preferably 2 mm or more. Further, it is 30 mm or less, preferably 5 mm or less.

<32>

The disposable diaper of any one of the above-mentioned disposable diapers, wherein the maximum width of the bulky region is formed to be larger than the uneven structure of the frontsheet in the fluffy region. The width of the convex portion of the non-woven fabric is wide, and is twice or more the width of the convex portion of the non-woven fabric, preferably 5 times or more.

<33>

The disposable diaper according to any one of <10> to <32> wherein, in the front sheet of the disposable diaper, the length of the convex portion in the fluffy region is in the length direction and the region other than the fluffy region. The length of the convex portion 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 the absorbent core constituting the absorbent body is formed by using particles in which an aggregate of pulp fibers is held by an absorbent polymer. As the covering material of the body, a coated sheet material which is a hydrophilic sheet and contains a water-permeable tissue (toilet paper) or a water-permeable non-woven fabric is used.

<35>

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

<36>

A disposable diaper according to any one of <10> to <35> wherein, as an adhesive for fixing each member, a hot-melt adhesive can be used as a hot-melt adhesive, which is styrene-isoprene- The heat of the block polymer system of styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butylene-styrene copolymer (SEBS) A fluxing agent.

<37>

The disposable diaper according to any one of <10>, wherein the space portion or the low basis weight of the absorbent core is located on both sides of the absorbent core in the underarm region along the length direction. Further on the inner side, and the shape thereof is formed in an arc shape convex toward the inner side toward the center line.

<38>

The disposable diaper according to any one of <10>, wherein the space portion or the low basis weight portion of the absorbent core includes the first space portion and the second space portion, and the first space portion and the second space portion are the first The space portion is formed in an arc shape that protrudes toward the center toward the center line from the both side edges of the absorptive core in the longitudinal direction, and the second space portion is located further inside than the arc-shaped top portion of the first space portion. And formed into a pair of rectangular shapes.

<39>

The disposable diaper according to any one of <10>, wherein the space portion or the low basis weight portion of the absorbent core includes the first space portion and the third space portion, and the first space portion and the third space portion are the first The space portion is located on the inner side of the both sides of the absorbent core in the longitudinal direction, and has a shape in which an arcuate shape is formed toward the center line toward the center line, and the third space portion is located adjacent to the first space portion. The tops of the arc-shaped top portions are formed in a rectangular shape, and the end portions of the back side regions of the third rectangular space portion are disposed on the back of each of the pair of arc-shaped first space portions. The end of the side region side is closer to the ventral region.

<40>

The disposable diaper according to any one of <10>, wherein the space portion or the low basis weight of the absorbent core is attached to both sides of the absorbent core along the longitudinal direction, from the back side The portion of the region that is in the underarm region is formed in a straight line through the entire area of the underarm region to the ventral region.

<41>

A disposable diaper according to any one of <10> to <36>, wherein The shape of the space portion or the low basis weight portion included in the core body, the fluffy region of the front sheet is disposed at a position corresponding to the space portion or the low basis weight portion, and the shape of the space portion or the low basis weight portion is the front sheet The fluffy region is similar in shape to a pair of space portions or a low basis weight portion, and is located on the inner side of the longitudinal direction of the absorbent core in the underarm region, and has a shape that is convex toward the center toward the center line. Out of the arc.

<42>

The disposable diaper according to any one of <10>, 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 front side sheets are provided on both sides The fluffy region includes a pair of first fluffy regions and further includes a pair of central fluffy regions between the pair of first fluffed regions, and the fluffy region of the front sheet is similar in shape to the two pairs of space portions, and two of the underarm regions are The side portion, the pair of first fluffy regions are formed in an arc shape convex toward the inner side from the both side edges of the front sheet along the longitudinal direction (Y direction) toward the center line CL, and in the pair of first fluffy regions Further, a pair of central fluffy regions are located on the inner side of the top of the arc-shaped fluffy region, and are formed in a rectangular shape elongated in the longitudinal direction, and the end portions of the back side regions of the pair of central fluffy regions are disposed at the end The end portions on the side of the back side region of each of the pair of arc-shaped fluffy regions are further on the ventral region.

<43>

The disposable diaper according to any one of <10>, 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 front surface portion is not provided on both sides. The fluffy region of the material includes a pair of central fluffy regions corresponding to the second space portion, and the central fluffy region of the front sheet is similar in shape to the second space portion, and is formed in a rectangular shape elongated in the longitudinal direction. .

<44>

The disposable diaper according to any one of <10>, wherein the absorbent core is as follows: the space portion or the low basis weight portion of the absorbent core includes a pair of space portions, and the pair of space portions Further including a space portion, in the underarm region, the pair of spaces The portion is located further on the inner side than the side edges along the longitudinal direction (Y direction) of the absorber, and has a shape formed in an arc shape convex toward the inner side toward the center line, and a central space portion between the pair of space portions It is located on the inner side of the top of the arc-shaped space portion, and is formed in a rectangular shape that is long in the longitudinal direction. The end portion on the side of the back side region of the one central space portion is disposed in a pair of arc-shaped space portions. The end portions of the respective back side region sides are further located on the ventral region, and the fluffy regions of the front sheet are similar in shape to the three spatial portions of the absorbent core, and in the underarm region, a pair of fluffy regions are located on the front side. The two sides of the sheet are further on the inner side along the longitudinal direction, and the shape thereof is formed in an arc shape convex toward the inner side toward the center line, and a central fluffy region is located between the pair of fluffy regions and a circular arc shape. The top of the fluffy region is further on the inner side and is formed in a rectangular shape elongated in the longitudinal direction, and the end portion on the side of the back side region of the one central fluffy region is disposed on each of the back side regions of the pair of arc-shaped fluffy regions. Side The end is further to the ventral area.

Example

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

[Example 1]

Using the apparatus shown in FIG. 5, the M mesh of the Merries (registered trademark) manufactured by Kao Co., Ltd. is dry and breathable so that the upper surface side of the front sheet is pressed against the first roll 102 of the press roll 100, and A disposable diaper of Example 1 comprising a pair of fluffy regions 9L, 9L was produced. The shape of the pair of fluffy regions 9L and 9L is formed in an arc shape which is convex toward the inner side from the side edge of the front sheet in the longitudinal direction (Y direction) toward the center line CL. The total area of the pair of fluffy regions 9L and 9L is 30.5 cm ² . Further, the apparent density of the portion having a higher apparent density of 9 h was 0.051 g/cm ³ , and the apparent density of the fluffy region 9 L was 0.027 g/cm ³ . Further, the apparent thickness of the portion 9h where the viewing density is high (the height of the convex portion 21 located in the portion 9h) is 0.8 mm, and the apparent thickness of the fluffy region 9L (the height of the convex portion 21 located in the fluffy region 9L) is 1.5 mm. In addition, in Fig. 15, the front sheet of the Merries (registered trademark) dry and breathable M size product manufactured by Kao Co., Ltd. is shown. The front sheet shown in Fig. 15 is a fluffy sheet comprising: an upper layer and a lower layer composed of a sheet, the upper layer being partially joined to the lower layer, the upper layer being protruded from a portion other than the joint portion, and a plurality of inner portions are formed The convex part of the cavity.

[Embodiment 2]

The Merics (registered trademark) dry-breathable M-size product manufactured by Kao Co., Ltd. was used to remove the front sheet, and the non-woven fabric shown below was replaced. Then, in the same manner as in the first embodiment, the apparatus shown in Fig. 5 was used. A disposable diaper of Example 2 comprising a pair of fluffy areas 9L, 9L was produced. The non-woven fabric to be replaced is the fluffy sheet shown in Fig. 16, and is a sheet in which a plurality of convex portions are formed in one layer. The non-woven fabric supplies a fabric comprising a core-sheath type composite fiber having a basis weight of 30 g/m ² to a shaping device, and a hot air is blown toward the fabric on the base along a protrusion disposed on the base in the shaping device. It is produced by shaping and fusing the fibers. The non-woven fabric of the replacement installation has a thickness of 2.5 mm. Further, in the disposable diaper of Example 2, the total area of the pair of fluffy regions 9L and 9L was 30.5 cm ² . Further, the apparent density of the portion having a higher apparent density of 9 h was 0.017 g/cm ³ , and the apparent density of the fluffy region 9 L was 0.012 g/cm ³ . Further, the apparent thickness of the portion 9h where the viewing density is high is 1.7 mm, and the apparent thickness of the fluffy region 9L is 2.5 mm.

[Comparative Example 1]

The M ries (registered trademark) dry breathable M size manufactured by Kao Co., Ltd. containing the front sheet shown in Fig. 15 was directly used as the disposable diaper of Comparative Example 1 without using the apparatus shown in Fig. 5 .

[Comparative Example 2]

The first roller 102 having a pair of concave concave portions 101 on the circumferential surface of the pressure roller 100 shown in FIG. 5 is replaced with a roller having a convex portion extending over the entire circumference in the center portion in the width direction of the roller. The Murries (registered trademark) dry breathable M size manufactured by Kao Co., Ltd. containing the front sheet shown in Fig. 15 is used to make the upper surface side of the front sheet and the change Further, the roller was pressed in the opposite direction, and a disposable diaper of Comparative Example 2 in which a pair of fluffy regions were disposed over the entire length direction (Y direction) of both side portions was produced.

[Comparative Example 3]

The first roller 102 having a pair of concave concave portions 101 on the circumferential surface included in the pressure roller 100 shown in FIG. 5 is replaced with a roller having a flat portion without the entire concave portion, and includes the front surface shown in FIG. The Murries (registered trademark) dry breathable M size manufactured by Kao Kasho Co., Ltd. is a comparative example in which the entire surface of the front sheet is pressed against the changed roll to form a non-fluffed area. 3 disposable diapers.

[Comparative Example 4]

The diaper obtained by replacing the front sheet of the Merries (registered trademark) dry-breathable M-size product manufactured by Kao Co., Ltd. into the non-woven fabric shown in Fig. 16 was directly used as Comparative Example 4 without using the apparatus shown in Fig. 5. Disposable diapers.

[Comparative Example 5]

The first roller 102 having a pair of concave concave portions 101 on the circumferential surface of the pressure roller 100 shown in FIG. 5 is replaced with a roller having a convex portion extending over the entire circumference in the center portion in the width direction of the roller. The disposable diaper of Comparative Example 4 was pressed so that the upper surface side of the front sheet was opposed to the changed roll, and a pair of fluffy regions were formed over the entire length direction (Y direction) of both side portions. The disposable diaper of Comparative Example 5.

[Comparative Example 6]

The first roller 102 having a pair of concave concave portions 101 on the circumferential surface included in the pressure roller 100 shown in FIG. 5 was replaced with a flat roller having no entire concave portion, and the disposable diaper of Comparative Example 4 was replaced. The disposable diaper of Comparative Example 6 having no loft area was produced by pressing the entire surface of the front sheet on the upper surface side opposite to the changed roll.

[Performance Evaluation]

With respect to the disposable diapers of Examples 1 to 2 and Comparative Examples 1 to 6, the diffusibility of the soft stool at the time of wearing was evaluated according to the following method. Evaluation environment is room temperature 23 ° C, humidity 50% RH. The results of these and the like are shown in Table 1 below.

[Diffuse when worn]

In the disposable diapers obtained in Examples 1 to 2 and Comparative Examples 1 to 6, 10 mL of a simulated soft stool was injected through a tube to the center portion of the back side region of the skin facing surface side of the front sheet. The simulated soft stool is composed of bentonite 28.0 g, glycerin 14.0 g, ion-exchanged water 114.1 g, Emulgen 130 K 0.03 wt% aqueous solution (Kao) 14.2 g, viscosity 300 mPa ‧ (23 ° C, vibrating viscometer: A&D shares limited Company manufacturing, SV-10).

After the injection, the film for OHP (Overhead Projector) was placed on the front sheet, and a roll having a diameter of 65 mm and a width of 65 mm was used from the film for OHP, and the diffusion width when the roll was rolled toward the ventral region was measured. And the distance from the injection point to the direction of the ventral region. In the measurement, three samples were measured for each diaper, and the average value of the measured values was determined and shown in Table 1.

According to the results shown in Table 1, it is apparent that the disposable diapers of Examples 1 to 2 are spread in the longitudinal direction of the underarm region as compared with the disposable diapers of Comparative Examples 1 to 6, and the width direction is The diffusion is suppressed. Therefore, according to the disposable diapers of Examples 1 to 2, it is expected to effectively prevent side leakage of the soft stool.

On the other hand, it is understood that the disposable diapers of Comparative Examples 1 and 4 do not have a fluffy region, and therefore, in the underarm region, not only the diffusion in the longitudinal direction but also the width is easy. The direction spreads. Moreover, it is understood that the disposable diapers of Comparative Examples 2 and 5 have a pair of fluffy regions existing on both sides in the longitudinal direction over the entire region, and therefore, the diffusion toward the crotch region is excessively promoted, and also spread in the width direction. Moreover, it can be seen that the disposable diapers of Comparative Examples 3 and 6 have no fluffy regions, and the entire region has a higher apparent density. Therefore, in the underarm region, it is not only easy to diffuse in the longitudinal direction but also easily along the width direction. diffusion.

[Industrial availability]

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

1‧‧‧Disposable diapers

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

5‧‧‧Absorbing ontology

5m‧‧‧Central Department

5s‧‧‧ side

6‧‧‧Three-dimensional folds

7‧‧‧Buckle belt

8‧‧‧Fixed tape

9h‧‧‧ the highest density part

9L‧‧‧ fluffy area

21‧‧‧ convex

22‧‧‧ recess

41‧‧‧Absorbable core

41s‧‧‧ Space Department

42‧‧‧Package

61‧‧‧Elastic members for the formation of three-dimensional pleats

62‧‧‧Three-dimensional pleat forming sheet

63‧‧‧ Leg elastic members for leg fold formation

90‧‧‧ side

A‧‧‧ Ventral area

B‧‧‧Back side area

C‧‧‧胯下区域

CL‧‧‧ center line

L1‧‧‧ length

T‧‧‧ area

Maximum width of the W1‧‧‧ fluffy area

W2‧‧‧Width of the convex part

X‧‧‧ direction

Y‧‧‧ direction

Claims (44)

An absorbent article comprising a vertically long absorbent body comprising a liquid-permeable front sheet disposed on a skin facing surface side and a liquid-impermeable back surface disposed on a non-skin facing surface side a sheet and an absorber disposed between the two sheets, wherein the absorbent body is divided into a ventral region on the ventral side of the wearer when worn, a back side region on the back side, and a ventral side a crotch region between the region and the back side region, wherein the front sheet comprises a fluffy non-woven fabric, and the front sheet except the back side region is on both sides of the absorbent body along the longitudinal direction. At least one pair of fluffy regions having an apparent density lower than a portion of the central portion of the crotch region having the highest apparent density is disposed. The absorbent article of claim 1, wherein the absorbent body comprises an absorbent core comprising a low basis weight of a pulp having a relatively low basis weight of the pulp constituting the absorbent core, or comprising a non-existing composition The space portion of the pulp of the absorbent core is disposed at a position corresponding to the low basis weight portion or the space portion. The absorbent article of claim 1, wherein the bulky region is not present in the ventral region and is disposed in the underarm region. The absorbent article according to claim 1, wherein the front sheet comprises a fluffy non-woven fabric having a concavo-convex structure including a plurality of convex portions that are at least raised toward the skin facing surface side and concave portions that are recessed adjacent to the convex portions. The absorbent article according to claim 4, wherein the uneven structure is a ridge structure in which the convex portion is a ridge and the concave portion is a groove. The absorbent article of claim 1, wherein the above-mentioned fluffy region has a thickness greater than the above The apparent thickness of the portion of the central portion of the underarm area that has the highest apparent density. The absorbent article according to claim 1, wherein the side of the innermost side of the outline of the fluffy region in plan view is formed in an arc shape convex toward the inner side, and the one side of the pair of fluffy regions is opposed to each other. . The absorbent article according to claim 4, wherein the maximum width of the bulky portion in a plan view is wider than the width of the convex portion of the nonwoven fabric constituting the uneven structure of the front sheet in the bulky region. The absorbent article according to claim 1, wherein at least one central fluffy region is further disposed between the pair of fluffy regions, and an end portion of the central fluffy region on the side of the back side region is disposed in each of the pair of fluffy regions. The end of the dorsal region side is further to the ventral region. A disposable diaper, such as the absorbent article of claim 1. The disposable diaper of claim 10, wherein the disposable diaper-expanding disposable diaper is provided with a pair of fastening tapes on the left and right side edges of the back side region, and the outer surface of the ventral region is provided with the adhesive Fastening strap with strap fastening. The disposable diaper according to claim 10, wherein the liquid-impermeable back sheet comprises a liquid-impermeable film and a package including a nonwoven fabric disposed outside. A disposable diaper according to claim 12, wherein said outer envelope has a retracted position therein, said retracted position being present in the underarm region. The disposable diaper according to claim 10, wherein the absorbent body comprises an absorbent core obtained by holding particles of a water absorbent polymer, and a coated core material covering the absorbent core. The disposable diaper according to claim 10, wherein each of the both sides of the disposable diaper in the longitudinal direction is provided with a sheet for forming a three-dimensional pleat forming elastic member fixed in an extended state, and is fixed to the front sheet. The side of the material is thereby formed with a pair of three-dimensional pleats. The disposable diaper according to claim 10, wherein in the both sides of the disposable diaper along the longitudinal direction, the leg elastic members for forming the leg gathers are disposed in an extended state, and by the leg elastic members Shrinks to form leg folds. The disposable diaper according to claim 10, wherein the base of the low basis weight of the absorbent core is lower than the other portions, and the ratio of the low basis weight to the high basis weight is 70% or less. The disposable diaper according to claim 10, wherein the absorbing system is formed by coating an absorbent core having a space portion formed in an arc shape convex toward the inside. The disposable diaper of claim 10, wherein the front sheet of the disposable diaper is provided with a pair of fluffy regions, and all of the regions other than the pair of fluffy regions have a higher apparent density, and the viewing density is higher. In part, its density is uniform. The requested item of disposable diapers 10, wherein the total area of the pair of fluffy area of 5cm ² or ^more or less 150cm. The disposable diaper according to claim 10, wherein the apparent density of the portion having the higher apparent density is 0.02 g/cm ³ or more and 0.1 g/cm ³ or less. The disposable diaper according to claim 10, wherein the above-mentioned fluffy region has an apparent density of 0.008 g/cm ³ or more and 0.05 g/cm ³ or less. The disposable diaper according to claim 10, wherein the visual density of the fluffy region is lower than the apparent density of the portion having the higher apparent density, and is 0.8 times or less of the apparent density of the portion having the higher apparent density. The disposable diaper according to claim 10, wherein in the disposable diaper, the space portion of the absorbent core is formed to protrude from the side edge along the longitudinal direction of the absorbent core toward the center line. Arc-shaped, similar to the shape of the space portion, the fluffy region of the front sheet is also from the side edge of the front sheet along the length direction The center line is formed in an arc shape that protrudes toward the inner side, and one side of the side that forms the contour of the loft area in plan view is formed in an arc shape that protrudes toward the inner side, and the one side that forms the pair of fluffy areas mutually In the opposite direction, the shape of the above-mentioned fluffy region is formed to be bilaterally symmetrical with respect to the center line. The disposable diaper according to claim 10, wherein the front sheet of the disposable diaper comprises a fluffy non-woven fabric having a plurality of convex portions that are raised toward the opposite side of the skin and a concave portion that is adjacent to the convex portion. In the uneven structure, the front sheet has a structure having an undulation on the side of the skin facing surface, and the non-skin facing surface side is flat. Further, the front sheet includes the first layer and the second layer of the sheet, the first The layer constitutes the skin facing surface of the front sheet, and the second layer constitutes the non-skin facing surface of the front sheet, and the first layer is formed with a plurality of convex portions which are bulged toward the opposite side of the skin and which become hollow inside the convex portion. The concave portion is formed therebetween, and the second layer is formed in a planar shape, and the first layer and the second layer are joined to each other in the concave portion. The disposable diaper of claim 25, wherein the first layer and the second layer comprise the same or different sheets, the sheet is substantially non-stretchable, and is a non-woven fabric, spunbonded by a carding method. Any of non-woven fabric, melt-blown nonwoven fabric, water jet non-woven fabric, and needle-punched nonwoven fabric, the fineness of the constituent fibers is 1 dtex or more and 20 dtex or less. The disposable diaper according to claim 25, wherein in the front sheet of the disposable diaper, the convex portion is surrounded by four or six concave portions including the joint portion, and the bottom surface thereof is flat, and the convex portion is ridged as a whole. A flat cuboid or frustum of curvature. The disposable diaper according to claim 25, wherein in the front sheet, the basis weight of the bulk region and the portion of the central portion of the underarm region having the highest apparent density are the same, including the first layer and the second layer. The basis weight of the entire front sheet is uniform, and the basis weight of the entire front sheet is 15 g/m ² or more and 150 g/m ² or less. A disposable diaper according to claim 10, wherein the view of the fluffy region of the front sheet is The thickness is 0.5 mm or more and 5 mm or less, and the apparent thickness of the portion having the higher apparent density is 0.3 mm or more and 3 mm or less. The disposable diaper of claim 10, wherein in the front sheet, the apparent thickness of the fluffy region is higher than the apparent thickness of the portion having the higher apparent density, and is higher than the apparent thickness and absorption of the portion having the higher apparent density. The total thickness of the body is 1.2 times or more the apparent thickness of the portion having the higher apparent density. The disposable diaper according to claim 10, wherein, when the disposable diaper is viewed from above, the maximum width of the bulky region is formed to be wider than the width of the convex portion of the non-woven fabric constituting the uneven structure of the front sheet in the loft region, the fluffy region The maximum width is 2 mm or more and 50 mm or less, and the width of the convex portion located in the above-mentioned fluffy region is 1 mm or more and 30 mm or less. The disposable diaper according to claim 10, wherein in the front sheet of the disposable diaper, the maximum width of the bulk region is formed to be wider than the width of the convex portion of the non-woven fabric constituting the uneven structure of the front sheet in the loft region. It is more than twice the width of the convex portion of the non-woven fabric. The disposable diaper according to claim 10, wherein in the front sheet of the disposable diaper, the length in the longitudinal direction of the convex portion in the fluffy region is the same as the length in the longitudinal direction of the convex portion in the region other than the fluffy region. The length of the convex portion is 1 mm or more and 30 mm or less. The disposable diaper according to claim 10, wherein the absorbent core constituting the absorbent body is obtained by using particles in which the aggregate of pulp fibers is held by the absorbent polymer, and is used as a covering material constituting the absorbent body. A sheet comprising a water-permeable tissue or a water-permeable nonwoven fabric. The disposable diaper according to claim 10, wherein the elastic member for forming the three-dimensional pleats and the leg elastic member are made of natural rubber, polyurethane, polystyrene-polyisoprene copolymer, and poly Styrene-polybutadiene copolymer, propylene A linear stretchable material of an ethyl acrylate-ethylene polyethylene-alpha olefin copolymer. A disposable diaper according to claim 10, wherein as a binder for fixing the members, a hot-melt adhesive can be used as a hot-melt adhesive, which is a styrene-isoprene-styrene block copolymer (SIS). A hot-melt adhesive of a block copolymer of styrene-butadiene-styrene block copolymer (SBS) and styrene-ethylene-butylene-styrene copolymer (SEBS). The disposable diaper according to claim 10, wherein the space portion or the low basis weight portion of the absorbent core is located further inward in the underarm region than the both sides of the absorbent core along the longitudinal direction, and the shape thereof is oriented The center line is formed in an arc shape that protrudes toward the inner side. The disposable diaper according to claim 10, 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 portion is self-absorbent core The both side edges along the longitudinal direction are formed in an arc shape that protrudes toward the center toward the center line, and the second space portion is located on the inner side of the arc-shaped top portion of the first space portion, and is formed in a pair of rectangular shapes. The disposable diaper according to claim 10, 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 portion is located at a relatively absorbent core The both sides of the longitudinal direction are further inside, and the shape thereof is formed in an arc shape convex toward the center toward the center line, and the third space portion is located at the top of the arc shape of the adjacent first space portion. In the middle, it is formed in a rectangular shape, and the end portion of the back side region of the third rectangular space portion is disposed at the end portion on the side of the back side region of each of the pair of arc-shaped first space portions. Ventral area. The disposable diaper according to claim 10, wherein the space portion or the low basis weight of the absorbent core is attached to both sides of the absorbent core along the longitudinal direction, and the portion of the back region from the underarm region It is formed in a straight line shape through the entire area of the crotch region to the ventral region. A disposable diaper according to claim 10, wherein the absorbent core comprises The shape of the space portion or the low basis weight portion, the fluffy region of the front sheet is disposed at a position corresponding to the space portion or the low basis weight portion, and the shape of the space portion or the low basis weight portion, the fluffy region of the front sheet and the pair The shape of the space portion or the low basis weight portion is similar, and the inner side of the absorbent core is located on the inner side of the longitudinal direction of the absorbent core, and the shape thereof is formed in an arc shape convex toward the inner side toward the center line. The disposable diaper according to claim 10, wherein the space portion or the low basis weight portion of the absorbent core includes the first space portion and the second space portion, and the fluffy region of the front sheet on both sides includes a pair of first The fluffy region further includes a pair of central fluffy regions between the pair of first fluffed regions, and the fluffy region of the front sheet is similar in shape to the two pairs of space portions, and a pair of first fluffy sides are formed on both sides of the underarm region. The region is formed in an arc shape convex toward the inner side from the both side edges of the front sheet along the longitudinal direction (Y direction) toward the center line (CL), and a pair of centers between the pair of first fluffed regions The fluffy region is located on the inner side of the top of the arc-shaped fluffy region, and is formed in a rectangular shape elongated in the longitudinal direction, and the end portions of the back side regions of the pair of central fluffy regions are disposed in a pair of arc-shaped portions. The ends of the respective dorsal region sides of the fluffy regions are further to the ventral region. The disposable diaper according to claim 10, wherein the space portion or the low basis weight portion of the absorbent core includes the first space portion and the second space portion, and the fluffy region of the front sheet is not provided on both sides, and The second space portion correspondingly includes a pair of central fluffy regions, and the central fluffy region of the front sheet is similar in shape to the second space portion, and is formed in a rectangular shape that is long in the longitudinal direction. The disposable diaper according to claim 10, wherein the absorbent core is as follows: the space portion or the low basis weight portion of the absorbent core includes a pair of space portions, and further includes a space portion between the pair of space portions, In the underarm region, the pair of space portions are located further on the inner side than the side edges along the longitudinal direction (Y direction) of the absorber, and the shape thereof is formed in an arc shape convex toward the inner side toward the center line, and Space department Further, one central space portion is located on the inner side of the top portion of the arc-shaped space portion, and is formed in a rectangular shape elongated in the longitudinal direction, and the end portion on the side of the back side region of the one central space portion is disposed at a larger one. The end portion on the side of the back side region of each of the arc-shaped space portions is located on the ventral region, and the fluffy region of the front sheet is similar to the shape of the three space portions of the absorbent core, in the underarm region. a pair of fluffy regions are located on the inner side of the side edges of the front sheet along the length direction, and the shape thereof is formed in an arc shape convex toward the inner side toward the center line, and further between the pair of fluffy regions The central fluffy region is located on the inner side of the top of the arc-shaped fluffy region, and is formed in a rectangular shape elongated in the longitudinal direction, and the end portion of the back side region side of the one central fluffy region is disposed in a pair of arc shapes The ends of the respective back side region sides of the fluffy regions are further to the ventral region.