JP5978048B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

As a conventional disposable diaper, in order to effectively express the absorption performance of the absorbent body, one in which the shape of the absorbent body and the basis weight of the absorbent material contained in the absorbent body are devised is known.
For example, Patent Document 1 includes a lower layer absorbent that extends in the front-rear direction from at least the crotch portion to the rear side portion as an absorbent body of the absorbent article. An upper layer absorber that is narrow and extends at least in the front-rear direction from the crotch portion to the rear portion, and that penetrates the front and back surfaces of the upper layer absorber on the left and right sides of the center line in the width direction of the upper layer absorber. The slits are described as extending from the crotch portion to the rear portion.
Patent Document 2 has a high basis weight region in which the basis weight of the water-absorbing polymer and pulp fiber is high, and a low basis weight region in which each basis weight is lower than the high basis weight region. An absorber is described which is formed in a physically continuous monolithic structure. Patent Document 2 describes an example in which the mixing ratio of the water-absorbing polymer and the pulp fiber is different between the high basis weight region and the low basis weight region.

JP 2010-131206 A JP 2004-65929 A

Patent Document 1 describes that the upper layer slit is used to promote the diffusion of the liquid to the outer side in the width direction of the absorber. However, there is no disclosure about the basis weight ratio of the water-absorbing polymer and the pulp fiber at the center in the width direction from the upper layer slit and at the outer side in the width direction from the slit. Moreover, even if such a slit is provided, there is a concern that the absorption / diffusion performance of the outer side portion of the slit in the absorbent body tends to be insufficient and the absorption performance of the entire absorbent body cannot be fully utilized.
Patent Document 2 describes an example in which the mixing ratio of the water-absorbing polymer and the pulp fiber is different between the high basis weight region and the low basis weight region. However, Patent Document 2 discloses nothing about setting the basis weight ratio between the water-absorbing polymer and the pulp fiber in the absorbent body by distinguishing between the widthwise central portion and the widthwise outer portion of the absorbent body. Absent.

  Therefore, the subject of this invention is providing the disposable diaper which can express the absorption performance of the wide range of an absorber effectively, and was excellent in absorption performance and leak prevention performance.

The present invention is a disposable diaper comprising an absorbent comprising a water-absorbing polymer and pulp fibers, wherein the absorbent comprises a crotch, a central absorbent, and the central absorbent on both sides of the central absorbent. Side absorbers arranged with a space between them, and the central absorber and the side absorbers by an absorber widthwise center line that bisects the overall length of the absorber in the longitudinal direction. Each of the bodies is divided into a front part and a rear part, and the water absorbent polymer in each of the front part of the central absorbent body, the rear part of the central absorbent body, the front part of the side absorbent body and the rear part of the side absorbent body When the basis weight ratio with respect to the pulp fiber is CF, CB, SF, and SB in this order, the relationship of the following formula (1) is satisfied.
CF>CB> SB and CF>SF> SB (1)

  The disposable diaper of the present invention can effectively develop a wide range of absorption performance of the absorbent body, and is excellent in absorption performance and leakage prevention performance.

FIG. 1 is a perspective view showing a disposable diaper according to the first embodiment of the present invention. FIG. 2 is a plan view showing a developed and extended state of the disposable diaper shown in FIG. FIG. 3 is a plan view showing an absorbent body in the disposable diaper shown in FIG. 1. FIG. 4 is a schematic diagram showing the flow of liquid in the absorber shown in FIG. FIG. 5 is a plan view showing an absorbent body according to the second embodiment of the present invention. FIG. 6 is a plan view showing an absorbent body according to the third embodiment of the present invention. FIG. 7 is a plan view showing an absorbent body according to the fourth embodiment of the present invention.

Below, the disposable diaper of this invention is demonstrated, referring drawings based on the preferable embodiment.
The disposable diaper 1 (hereinafter also referred to as diaper 1) according to the first embodiment of the present invention includes an absorbent body 4 containing a water-absorbing polymer and pulp fibers, as shown in FIGS. The absorbent body 4 has a central absorbent body 5 in the crotch part C, and side absorbent bodies 6 and 6 arranged on both sides of the central absorbent body 5 with a space between the central absorbent body 5. doing. The center absorbent body 5 and the side absorbent bodies 6 and 6 are separated from the front parts 5f and 6f and the rear parts 5b and 6b by the absorbent body width direction center line CL that bisects the longitudinal total length L5x of the absorbent body 4, respectively. Divide into Basis weight ratio of water-absorbing polymer to pulp fiber in each of the front part 5f of the central absorbent body 5, the rear part 5b of the central absorbent body 5, the front part 6f of the side absorbent body 6, and the rear part 6b of the side absorbent body 6. Where CF, CB, SF, and SB are satisfied in this order, the relationship of the following formula (1) is satisfied.
CF>CB> SB and CF>SF> SB (1)

  As shown in FIGS. 1 and 2, the diaper 1 has a ventral side A, a back side B, and a crotch C. The ventral part A is a part arranged on the wearer's belly side when worn, and the back side part B is a part arranged on the wearer's back side when wearing. The crotch part C is located between the abdominal part A and the dorsal part B, and is disposed in the crotch part of the wearer when worn.

  The longitudinal direction X of the diaper 1 is a direction extending from the abdominal side A to the back side B through the crotch C, and the width direction Y of the diaper 1 is a direction intersecting the diaper longitudinal direction X. Moreover, since the longitudinal direction X of the diaper 1 is a wearer's front-back direction at the time of wear, the abdominal side in the longitudinal direction X of a diaper or an absorber is also called the front, and a back side is also called back.

As shown in FIG. 1, the diaper 1 has an exterior body 2 and an absorbent main body 3 fixed to the skin surface side of the exterior body 2.
As shown in FIG. 2, the absorbent main body 3 has a rectangular shape that is long in the same direction as the longitudinal direction (X direction) of the diaper, and is a liquid-permeable top sheet 31, liquid-impermeable or liquid-impermeable (repellent). A back sheet (not shown) of water-based or the like, and a liquid-retaining absorbent 4 interposed between the two sheets. The absorber 4 is made by holding a water-absorbing polymer in pulp fibers. The absorbent body 4 in this embodiment is covered with a covering sheet 33. The covering sheet 33 may be a single sheet, or may be composed of two sheets covering each of the skin contact surface side and the non-skin contact surface side of the absorbent body 4. The covering sheet 33 prevents pulp fibers and water-absorbing polymers from falling off, and preferably the skin contact surface side and / or the non-skin contact surface side of the absorbent body 4 made of pulp fibers and water-absorbing polymer. Are bonded to each other through an adhesive (such as a hot-melt adhesive).
As shown in FIG. 2, side cuffs 8 and 8 made of a liquid-resistant or water-repellent and breathable material are formed on the left and right sides of the absorbent main body 3 in the longitudinal direction. In the vicinity of the free end of each side cuff 8, a plurality of side cuff elastic members 81 are arranged in an expanded state. The side cuff 8 stands up when wearing a diaper and prevents the liquid from flowing out to the side.

  As shown in FIGS. 2 and 3, the absorbent body 4 in the diaper 1 of the first embodiment has a shape that is long in the same direction as the longitudinal direction X of the diaper. Both the longitudinal direction and the longitudinal direction of the side absorbent body 6 are the same as the diaper longitudinal direction X. Therefore, each longitudinal direction of the absorber 4, the center absorber 5, and the side absorber 6 is also referred to as a longitudinal direction X.

The absorbent body 4 has, in the crotch part C, a central absorbent body 5 located at the central part in the diaper width direction Y, and side absorbent bodies 6 and 6 arranged at intervals on the left and right sides thereof. .
Between the central absorbent body 5 and the side absorbent bodies 6, 6, there are a pair of separating parts 7, 7 extending in the diaper longitudinal direction X. As shown in FIG. 2, the central absorbent body 5 extends from the crotch part C to the back side part B and the abdominal side part A, and the side absorbent bodies 6, 6 and the separating parts 7, 7. Is provided in the crotch part C. The separation part 7 in this embodiment is a groove | channel which penetrated the absorber 4 to the thickness direction, and is an area | region where absorber formation materials, such as a water absorbing polymer and a pulp fiber, do not exist. However, the separation part 7 between the central absorbent body 5 and the side absorbent body 6 has a significantly lower basis weight (for example, 1) than the absorbent body forming material in each of the central absorbent body 5 and the side absorbent body 6. / 4 or less) may be a site where the absorber-forming material is present. In the absorbent body 4 of the first embodiment, the core wrap sheet that covers the skin contact surface side of the absorbent body 4 and the core wrap sheet that covers the non-skin contact surface side of the absorbent body 4 are joined at the separation portion 7. ing.
Note that the separating portion 7 also plays a role of inducing bending of the absorber 4. When the diaper 1 is worn, the side absorbent body 6 stands obliquely so as to approach the wearer side.

  As shown in FIG. 3, the central absorbent body 5 has a front part 5 f located in front of the absorbent body width direction center line CL, and a rear part 5 b located in the rear of the center line CL. Moreover, the side part absorber 6 also has the front part 6f located ahead of the absorber width direction center line CL, and the rear part 6b located behind the center line CL.

  In the diaper 1 of the first embodiment, the polymer ratio in the front part 5f of the central absorbent body 5 is CF, the polymer ratio in the rear part 5b of the central absorbent body 5 is CB, and the front part 6f of the side absorbent body 6 is When the polymer ratio is SF and the polymer ratio of the rear part 6b of the side absorbent body 6 is SB, CF> CB> SB and CF> SF> SB are satisfied. The polymer ratio is a percentage of the basis weight ratio of the water absorbent polymer to the pulp fiber (ratio of the basis weight of the water absorbent polymer to the basis weight of the pulp fiber).

  The basis weight of the pulp fiber and the basis weight of the water-absorbing polymer of each of the front part 5f and the rear part 5b of the central absorbent body 5 and the front part 6f and the rear part 6b of the side absorbent body 6 are measured as follows. The

<Method for measuring basis weight of pulp fiber and basis weight of water-absorbing polymer>
The core wrap sheet 33 is carefully peeled off from the absorbent body 4, the central absorbent body 5 and the side absorbent body 6 are cut along the absorbent body width direction center line CL, respectively, and the front part 5f, the rear part 5b, the front part 6f, the rear part Each part 6b is cut out. For each, the total weight of the absorbent polymer and pulp fibers is measured. Next, in the absorbent body 4, the pulp fiber content in each part is the same and an absorbent body 4 ′ not containing the absorbent polymer is prepared. Measure the weight.
A value obtained by subtracting the weight of the latter pulp fiber from the total weight of the former absorbent polymer and pulp fiber is defined as the weight of the absorbent polymer. The weight of the absorbent polymer and the weight of the pulp fiber in each part determined as described above are divided by the area in plan view of each part to obtain the basis weight in each part.
Moreover, when such a measuring method is difficult, for example, it is difficult to specify and obtain a material constituting the absorber 4 from a commercially available product, and an absorber that does not contain an absorbent polymer is created. If this is difficult, the following method is substituted.
The core wrap sheet 33 is carefully peeled off from the absorbent body 4, the central absorbent body 5 and the side absorbent body 6 are cut along the absorbent body width direction center line CL, respectively, and the front part 5f, rear part 5b, front part 6f, rear Each part 6b is cut out. For each, the water-absorbing polymer and pulp fibers are separated and each weight is measured. The water-absorbing polymer and the pulp fiber can be separated from each other as long as the water-absorbing polymer and the pulp fiber can be almost completely separated, and various means can be used. For example, using the difference in particle size, sieving with a fine mesh, or using the difference in weight, placing under an air volume where only the pulp is scattered, the weight before and after scattering may be measured. . The planar view areas of the front part 5f and the rear part 5b of the central absorbent body 5 and the front part 6f and the rear part 6b of the side absorbent body 6 are obtained in an expanded state. For example, when an elastic member is disposed on the absorber and it is contracted, the contracted state is released. The weight of the water-absorbent polymer and the pulp fiber in each part determined as described above are divided by the area in plan view of each part to obtain the basis weight in each part.

When such a measurement method is difficult, the following method is used instead.
The core wrap sheet 33 is carefully peeled off from the absorbent body 4, the central absorbent body 5 and the side absorbent body 6 are cut along the absorbent body width direction center line CL, respectively, and the front part 5f, rear part 5b, front part 6f, rear Each part 6b is cut out. About each, the weight of an absorber is measured and the basic weight of the cut-out absorber is calculated. Further, the weight of the superabsorbent polymer is quantified, the basis weight of the superabsorbent polymer is subtracted from the basis weight of the cut-out absorber, and the basis weight of the fibers in the cut-out absorber is calculated. The weight of the superabsorbent polymer in the cut-out absorber is determined by measuring the weight and area of the cut-out absorber, then immersing each cut-out absorber in an ascorbic acid solution and exposing it to sunlight. Can be calculated by subtracting the residual fiber weight after washing from the weight of the cut-out absorber.

  A preferable range of the polymer ratio in the front portion 5f of the central absorbent body 5 is preferably 40% or more, more preferably 50% or more, and preferably 200% or less, more preferably 180% or less. The content is preferably 40 to 200%, more preferably 50 to 180%. Similarly, the preferable range of the polymer ratio in the rear portion 5b is 20% or more, preferably 150% or less, more preferably 120% or less, for example, preferably 20 to 150%, more Preferably it is 20 to 120%. The preferable range of the polymer ratio in the front portion 6f of the side absorbent body 6 is 20% or more, preferably 150% or less, more preferably 120% or less, for example, 20 to 150%. Preferably, it is 20 to 120%. A preferable range of the polymer ratio in the rear portion 6b is 5% or more, preferably 100% or less, more preferably 80% or less, for example, preferably 5 to 100%, more preferably 5%. ~ 80%. By setting it in this range, in addition to improving the urine diffusion range / diffusion rate, it is effective for ensuring the retention of loose stool.

The preferred range of the polymer basis weight in the front part 5f of the central absorbent body 5 is preferably 80 g / m ² or more, more preferably 100 g / m ² or more, and preferably 180 g / m ² or less, more preferably 160 g. / m ² or less, for example, is preferably 80～180G / m ^2, more preferably from 100 to 160 g / m ^2. Similarly, the preferred range of the polymer basis weight in the rear portion 5b is preferably 30 g / m ² or more, more preferably 35 g / m ² or more, and preferably 100 g / m ² or less, more preferably 80 g / m. ² or less, for example, is preferably from 30 to 100 g / m ^2, more preferably from 35~80g / m ^2. The preferred range of the polymer basis weight in the front portion 6f of the side absorbent body 6 is preferably 25 g / m ² or more, more preferably 30 g / m ² or more, and preferably 100 g / m ² or less, more preferably 80 g / m ² or less, for example, is preferably 25~100g / m ^2, more preferably from 30 to 80 g / m ^2. A preferable range of the polymer basis weight in the rear portion 6b is 10 g / m ² or more, preferably 80 g / m ² or less, more preferably 70 g / m ² or less, for example, 10 to 80 g / m ² . It is preferably 10 to 70 g / m ² . By setting the polymer basis weight within such a range, the diffusion range of the body fluid diffused from the urine drainage portion becomes a more preferable range, and the ability to retain and absorb soft stool can be ensured. On the other hand, the preferred range of the pulp fiber basis weight is preferably 70 g / m ² or more, more preferably 80 g / m ² or more, and preferably 170 g / m ² or less, more preferably 160 g / m in 5f. ² or less, for example, is preferably 70~170g / m ^2, more preferably from 80~160g / m ^2. In 5b, preferably 60 g / m ² or more, more preferably 70 g / m ² or more, and at 160 g / m ² or less, for example, it is preferably from 60 to 160 / m ^2, more preferably 70 to 160 g / m ² . In 6f, preferably 70 g / m ² or more, more preferably 90 g / m ² or more, and at 170 g / m ² or less, for example, is preferably 70~170g / m ^2, more preferably 90-170 g / m ² . In 6b, it is preferably 100 g / m ² or more, more preferably 120 g / m ² or more, and 200 g / m ² or less, for example, preferably 100 to 200 g / m ² , more preferably 120-200 g / m ² . By making the pulp fiber basis weight within such a range, it becomes easy to make the diffusion rate of the body fluid moderate.

  In the first embodiment, the front part 5f and the rear part 5b of the central absorbent body 5 are physically continuous, and the front part 6f and the rear part 6b of the side absorbent body 6 are physically connected. It is continuous. The term “physically continuous” means that the mixed fibers of separately produced pulp fibers and water-absorbing polymers are not arranged to face each other.

Moreover, it is preferable that the basis weight ratio with respect to the pulp fiber of the water absorbing polymer continuously changes from the front part 5f to the rear part 5b. Moreover, it is preferable that the basis weight ratio with respect to the pulp fiber of a water absorbing polymer is changing continuously from the front part 6f to the back part 6b also for the side part absorber 6. FIG. In the central absorbent body 5 and / or the side absorbent bodies 6, it is preferable that the basis weight of the water-absorbing polymer continuously changes from the front parts 5 f and 6 f to the rear parts 5 b and 6 b.
Here, continuously changing from the front part to the rear part means that, for the central absorbent body 5, between the X direction central part of the front part 5f and the X direction central part of the rear part 5b, This means that the weight ratio and the basis weight of the water-absorbing polymer do not have a site that changes rapidly, and for the side absorbent body 6, the X-direction central portion of the front portion 6f and the X-direction central portion of the rear portion 6b Means that the basis weight ratio or the basis weight of the water-absorbing polymer does not have a portion that changes rapidly. Moreover, in the expression of continuous change, the basis weight ratio or the basis weight of the water-absorbing polymer is present between the X-direction center portion of the front portion 5f (6f) and the X-direction center portion of the rear portion 5b (6b). This includes the case where includes a portion that does not change.

  More preferably, in the central absorbent body 5, the basis weight ratio of the water-absorbing polymer to the pulp fiber continuously decreases from the front end portion to the rear end portion in the longitudinal direction X, and the side absorbent body 6 is in the longitudinal direction X. From the front end portion to the rear end portion, the basis weight ratio of the water-absorbing polymer to the pulp fiber continuously decreases. And also in the whole absorber 4, the basic weight ratio with respect to the pulp fiber of a water-absorbing polymer has decreased continuously from the front-end part of the longitudinal direction Y to the rear-end part.

The absorber 4 of 1st Embodiment is further explained in full detail based on FIG.
As shown in FIGS. 2 and 3, the central absorbent body 5 according to the first embodiment has a wide portion 5x having a wider width than that in the crotch portion C at the rear portion 5b. Further, the central absorbent body 5 also has a wide portion 5x ′ whose width is larger than that in the crotch portion C in the front portion 5f. Thereby, the central absorbent body 5 has an hourglass shape in which the central portion in the longitudinal direction X is constricted.
More specifically, as shown in FIG. 3, the central absorbent body 5 has, in the longitudinal direction X, a central part 5r, an end part 5p on the front part 5f side, and an end part 5q on the rear part 5b side, Both side edges have a portion parallel to the longitudinal direction X (a portion where the width in the diaper width direction Y is constant, hereinafter also referred to as a side edge parallel portion). The width of the side edge parallel portion in the central portion 5r is larger than the width of the side edge parallel portion in the end portion 5p on the front portion 5f side and the width of the side edge parallel portion in the end portion 5q on the rear portion 5b side. It is getting smaller. The width of the central absorbent body 5 gradually increases from the central portion 5r to the end portion 5p on the front portion 5f side and from the central portion 5r to the end portion 5q on the rear portion 5b side.

  In the central absorbent body 5, the maximum width L5 of the wide part 5x on the rear part 5b side is the distance between the outer edges (side edges 6w, 6w on the outer side in the diaper width direction) of the side absorbent bodies 6, 6 in the crotch part C. Equal to L6. Thereby, in the longitudinal direction X, the end part on the rear part 6 b side of the side absorbent body 6 is opposed to the part of the rear part 5 b of the central absorbent body 5 whose side edge is inclined with respect to the longitudinal direction X. . In the example shown in FIG. 3, in the central absorbent body 5, the maximum width L5 'at the end portion 5p on the front portion 5f side is equal to the maximum width L5 of the wide portion 5x. The distance L6 is substantially constant over the entire length of the side absorbent body 6.

  The side absorbent bodies 6, 6 are arranged on both sides in the central part 5 r in the longitudinal direction X of the central absorbent body 5. The side absorbent body 6 has a shape that matches the constricted shape of the central absorbent body 5. In the example shown in FIG. 3, the side absorbent body 6 has a substantially isosceles trapezoidal shape having a bottom in the diaper width direction Y.

The cut-off portions 7 are provided along both side edges in the constricted portion of the central absorbent body 5. The cut-off portions 7 and 7 have a substantially U-shape that spreads in the plan view in accordance with the shape of the constricted portion of the central absorbent body 5. The ratio of the length in the longitudinal direction of the separation part to the length in the longitudinal direction of the central absorbent body 5 is preferably 35% or more, more preferably 40% or more, and preferably 80% or less, more preferably 70%. For example, 35 to 80% is preferable, and 40 to 70% is more preferable. In the case of an adult diaper, the longitudinal length of the separation part is preferably 200 mm or more, more preferably 250 mm or more, preferably 450 mm or less, more preferably 400 mm or less, for example, 200 to 450 mm. It is preferable that it is 250-400 mm. It is preferable that the central absorbent body 5 and the side absorbent bodies 6 and 6 are formed as separate bodies, respectively, with the separation part interposed therebetween.
In 1st Embodiment, the continuous part is not provided between the center absorber 5 and the side part absorbers 6 and 6, and the front-and-rear edge part of the separation parts 7 and 7 is a both-sides edge of an absorber. It extends to. Thereby, the center absorber 5 and the side absorbers 6 and 6 are not physically continuous. The separation parts 7 and 7 partition between the front part 5f and the front part 6f of the central absorbent body 5 and between the rear part 5b of the central absorbent body 5 and the rear part 6b of the side absorbent body 6. Partitioning.
The width 7w (see FIG. 3) of the separation part 7 is preferably 5 mm or more, more preferably 10 mm or more, and preferably 40 mm or less, more preferably 30 mm or less, for example, 5 to 40 mm. Is more preferable, and 10 to 30 mm is more preferable. In the first embodiment, the width 7w of the separating portion 7 is substantially constant.

  In the diaper width direction Y, the ratio (L5 / L6w) between the maximum width L5 of the central absorbent body 5 and the maximum width L6w (see FIG. 3) of the side absorbent bodies 6 is 2.1 or more and 4.5 or less. It is preferable that In the diaper longitudinal direction X, the ratio (L5x / L6x) of the maximum length L5x of the central absorbent body 5 to the maximum length L6x of the side absorbent bodies 6 (see FIG. 3) is 1.5 or more. It is preferably 0 or less.

The central absorbent body 5 has a notch 5k on one end side in the longitudinal direction X. In the first embodiment, the notch portion 5k is formed at the end portion 5q on the rear portion 5f side in the longitudinal direction X of the central absorbent body 5. The cutout portion 5k has a substantially isosceles triangular shape having a bottom in the diaper width direction Y. In the first embodiment, the cutout portion 5k is a portion where there is no absorber-forming material such as a water-absorbing polymer or pulp fiber. However, the notch 5k may be a portion where an absorber-forming material having a significantly lower basis weight (for example, ¼ or less) than the basis weight of the absorber-forming material in an adjacent portion. For example, the basis weight of the absorber-forming material existing in the notch 5k (the total basis weight of the pulp fiber and the water-absorbing polymer is preferably 60 g / m ² or less.

  As shown in FIG. 2, the exterior body 2 extends over the entire outer periphery of the peripheral portion of the absorbent main body 3, and in the unfolded and expanded diaper 1, the hourglass shape in which the central portion in the longitudinal direction is constricted. I am doing. The exterior body 2 includes an outer layer sheet 22 that forms the outer surface of the diaper 1, an inner layer sheet 23 that is disposed adjacent to the outer layer sheet 22 on the skin side of the outer layer sheet 22, and an abdominal side A and a back side B Auxiliary sheets 24 that are arranged one by one and cover the upper end of the absorbent main body 3 and the skin surface side in the vicinity thereof are laminated. As shown in FIG. 2, in each of the back side portion B and the ventral side portion A, the upper end portion of the absorbent main body 3 is between the inner layer sheet 23 and the auxiliary sheet 24 positioned on the skin surface side from the inner layer sheet 23. It is sandwiched between. Further, the outer layer sheet 22 has a folded portion 22a in which a portion extending outward from the waist opening edge of the diaper 1 is folded back to the skin surface side in each of the back side portion B and the ventral side portion A. The folded portion 22 a is laminated on the skin surface side of the auxiliary sheet 24.

The material for forming the diaper 1 will be described. Various members conventionally used for disposable diapers, sanitary napkins, incontinence pads, and other diapers can be used without particular limitation as members of each part of the diaper 1. For example, as the surface sheet 31, a liquid-permeable sheet such as a nonwoven fabric or an apertured film can be used. However, the top sheet 31 is preferably an air-through nonwoven fabric or a spunbond nonwoven fabric subjected to a hydrophilic treatment made of a soft material that hits the skin.
As the back sheet, for example, a resin film having no moisture permeability, a resin film having fine pores and moisture permeability, a nonwoven fabric such as a water-repellent nonwoven fabric, a laminate of these with other sheets, or the like may be used. it can. Moreover, as the core wrap sheet 33, hydrophilic paper (for example, tissue paper), a water-permeable nonwoven fabric, or the like can be used, and hydrophilic paper is particularly preferable. Moreover, as the water-absorbing polymer contained in the absorbent body 4, water-absorbing polymers having various compositions and shapes conventionally used for diaper absorbent bodies such as disposable diapers, sanitary napkins, and incontinence pads can be used. The same applies to the pulp fibers contained in the absorbent body 4.

  Examples of the absorbent body 4 include, but are not limited to, a mixed fiber product of pulp fibers and a water-absorbing polymer, and a product in which a water-absorbing polymer is interposed between pulp fiber stacks. Moreover, the notch part 5k can be formed by excising a part of the mixed product. In addition, it is formed by preventing pulp fibers from accumulating at the location corresponding to the notch when manufacturing pulp fibers and mixed fibers of pulp fibers and absorbent polymers with a fiber pile machine. You can also

  As described above, the diaper 1 of the present embodiment has a central absorption as shown in FIG. 4 because the polymer ratio of each part of the absorber 4 satisfies the relationship of CF> CB> SB and CF> SF> SB. The liquid (urine) excreted in the front part 5f of the body 5 diffuses in the central absorbent body 5 and moves from the front part 5f to the rear part of the central absorbent body 5 by a path R1 that moves from the front part 5f to the rear part 5b. Movement to 5b occurs. Moreover, it transfers to the side part absorber 6 from the front part 5f of the center absorber 5, and the inside of the side part absorber 6 is spread | diffused from the front part 6f to the back part 6b. And the path | route R2 of returning to the back part 5b of the center absorber 5 again produces the movement from the front part 5f of the center absorber 5 to the back part 5b. Further, the rear part 5b of the central absorbent body 5 has a polymer ratio lower than that of the front part 6f of the central absorbent body 5 and gel blocking is unlikely to occur, so that the liquid reaching the rear part 5b Even in a state where body pressure is applied, it is well absorbed by the rear portion 5b.

  More specifically, the polymer ratio SF of the front part 6f of the side absorbent body 6 is lower than the polymer ratio CF of the front part 5f of the central absorbent body 5 (CF> SF). By having the separation part 7 between the absorber 6 and the rear part 5b, the liquid (urine) excreted in the front part 5f is transferred from the front part 5f of the central absorber 5 to the front part 6f of the side part absorber 6. Easy to move to. Further, in the liquid transferred to the front part 6f of the side absorbent body 6, the polymer ratio SF of the front part 6f of the side absorbent body 6 is higher than the polymer ratio SB of the rear part 6b of the side absorbent body 6 (SF> SB), the inside of the side absorbent body 6 is easily diffused and moved to the rear part 6b. The movement of the liquid from the front part 5f of the central absorbent body 5 to the rear part 6b of the side absorbent body 6 is more likely to occur when the wearer is lying sideways. Due to the presence of the separation portion 7, the separation portion 7 serves as a water guide groove and promotes diffusion in the longitudinal direction X, so that the front portion 5 f of the central absorbent body 5 moves to the front portion 6 f of the side absorbent body 6. Liquid movement is likely to occur.

Further, since the polymer ratio CB of the rear part 5b of the central absorbent body 5 is lower than the polymer ratio CF of the front part 5f of the central absorbent body 5 (CF> CB), the rear part 5b is less likely to cause gel blocking. Since the absorption performance is easily maintained, the liquid is easily absorbed and retained by the rear portion 5b even in a state where body pressure is applied.
Moreover, the polymer ratio CB of the rear part 5b of the central absorbent body 5 is higher than the polymer ratio SB of the rear part 6b of the side absorbent body 6 (CB> SB), and the presence of the separation part 7 causes the rear part 6b. Thus, the liquid can be easily delivered to the rear part 5 b through the separation part 7. That is, it is easy for the rear part 5b of the adjacent central absorbent body 5 to suck up the liquid that the rear part 6b of the side absorbent body 6 cannot absorb. In addition, the liquid transferred to the rear portion 5b is easily held and is difficult to leak from the rear end of the absorber.
By such an action, according to the diaper 1, it is considered that the absorption performance in a wide range of the absorber can be effectively expressed, and excellent absorption performance and leakage prevention performance can be obtained.

  From the viewpoint of ensuring such an effect, the difference in the polymer ratio of the absorbent body 4 is preferably as follows. The difference (CF-CB) between the polymer ratio (CF) of the front part 5f of the central absorbent body 5 and the polymer ratio (CB) of the rear part 5b of the central absorbent body 5 is 20 percentage points or more, preferably 50 percentage points or more. It is. The difference (CB-SB) between the polymer ratio (CB) of the rear part 5b of the central absorbent body 5 and the polymer ratio (SB) of the rear part 6b of the side absorbent body 6 is 15 percentage points or more, preferably 30 percentage points. That's it. The difference (CF-SF) between the polymer ratio (CF) of the front part 5f of the central absorbent body 5 and the polymer ratio (SF) of the front part 6f of the side absorbent body 6 is 20 percentage points or more, preferably 50 percentage points That's it. The difference (SF-SB) between the polymer ratio (SF) of the front part 6f of the side absorbent body 6 and the polymer ratio (SB) of the rear part 6b of the side absorbent body 6 is 15 percentage points or more, preferably 30 percent More than points.

  From the viewpoint of ensuring such an effect, it is preferable that the upper and lower surfaces of the absorbent body 4 are covered with a non-woven core wrap sheet 33 made of tissue paper or hydrophilic fibers. It is preferable that the core wrap sheets 33 disposed on the upper and lower surfaces of the absorbent body 4 are directly joined via the separating portion 7. By directly joining, the expression of the recess can be promoted, and the effect as a water guide groove can be further achieved.

In addition, when the front part 5f and the rear part 5b of the central absorbent body 5 and the front part 6f and the rear part 6b of the side absorbent body 6 are respectively physically continuous, the front part 5f of the central absorbent body 5 and Abrupt changes in the basis weight of the water-absorbing polymer and the basis weight of the pulp fiber hardly occur between the rear part 5b or between the front part 6f and the rear part 6b of the side part absorbent body 6. For this reason, the diaper 1 can suppress the uncomfortable feeling at the time of wearing.
In particular, one or both of the central absorbent body 5 and the side absorbent body 6 are mounted such that the basis weight ratio of the water-absorbing polymer to the pulp fiber continuously changes from the front part to the rear part. This is more preferable from the viewpoint of suppressing the uncomfortable feeling of time.

  Moreover, the diaper 1 has the notch part 5k in the edge part 5q by the side of the back part 5f of the longitudinal direction X of the center absorber 5, and it aims at the improvement of mounting | wearing property by this. In general, when the cutout portion 5k is provided in the absorbent body 4, the liquid leaks easily from the end portion 5q on the rear portion 5b side. However, in the diaper 1 of the present invention, in addition to the absorption performance of the central absorbent body 5 in the front-rear direction, the absorption performance of the entire absorbent body is effectively utilized by diffusion of the body fluid through the side absorbent body 6 in the width direction. It has become easier. Therefore, even if the notch 5k is provided, liquid leakage is less likely to occur. For this reason, compatibility between the liquid absorption performance and the wearability is achieved.

  Further, in the diaper 1, the central absorbent body 5 has a wide portion 5x whose width is larger than that in the crotch portion C. The maximum width L5 of the wide portion 5x is equal to the distance L6 between the side edges 6w and 6w in the side absorbent body 6. For this reason, the liquid from the side absorbent body 6 is likely to diffuse into the wide portion 5x in the central absorbent body 5, and the liquid is easily held in the central absorbent body 5. Thereby, the diaper 1 can reduce the liquid leakage from the absorber 4, providing the notch part 5k, and can make mounting | wearing improvement and liquid leakage reduction compatible.

  Next, the disposable diaper of 2nd-4th embodiment of this invention is demonstrated based on FIGS. About 2nd-4th embodiment, a different point from 1st Embodiment is demonstrated, about the same point, the same code | symbol is attached | subjected and description is abbreviate | omitted. About the point which does not mention especially, the description regarding the disposable diaper 1 mentioned above is applied suitably.

The disposable diaper of 2nd-4th Embodiment replaces the absorber 4 in the disposable diaper of 1st Embodiment with the absorber 4A-4C shown in FIGS.
The shape of the absorbent body 4A in the second embodiment is shown in FIG. In the absorbent body 4A, the absorbent body-forming material continuously exists between the end portion of the side absorbent body 6 on the front portion 6f side and the wide portion 5x ′ on the front portion 5f side of the central absorbent body 5. It is not separated by the separation part 7. The front ends in the diaper longitudinal direction X of the separating portions 7A and 7A do not extend to the outer edge of the absorber 4A, and are dead ends located inside the absorber 4A in plan view.

  The absorbent body 4B in the third embodiment shown in FIG. 6 is opposite to the second embodiment in that the end part on the rear part 6b side of the side part absorbent body 6 and the wide part 5x of the rear part 5b of the central absorbent body 5. Between them, the absorber-forming material is continuously present and is not separated by the separation portion 7B. In the cut-off portions 7B and 7B, the rear end of the diaper longitudinal direction X does not extend to the outer edge of the absorber 4B, and is a dead end located inside the absorber 4B in plan view.

  Further, the absorbent body 4C in the fourth embodiment shown in FIG. 7 absorbs between the end portion on the front portion 6f side of the side absorbent body 6 and the wide portion 5x ′ on the front portion 5f side of the central absorbent body 5. The body-forming material exists continuously and is not separated by the separation portion 7C. Further, the absorber forming material continuously exists between the end of the side absorbent body 6 on the rear part 6b side and the wide part 5x of the central absorbent body 5 on the rear part 4b side, so that the separation part It is not separated by 7C.

  As mentioned above, although several preferable embodiment was described about the diaper of this invention, this invention is not restrict | limited to each embodiment mentioned above at all, and can be changed suitably.

  For example, the absorbent body 4 is preferably covered with the core wrap sheet 33, but may not be covered. Further, the notch portion 5k is not necessarily provided in the central absorbent body 5. When the notch 5k is provided, it may be provided not at the rear end 5q of the central absorbent body 5 in the longitudinal direction X but at the front end 5p or may be provided at both ends.

Further, the central absorbent body does not have to be constricted in the central portion in the longitudinal direction, and can have an arbitrary shape such as a rectangular shape or a trapezoidal shape. The shape of the side absorber can also have an arbitrary shape such as a rectangular shape, a triangular shape, or a semicircular shape.
Moreover, as for a center absorber and a side part absorber, the front part and the back part do not need to be physically continuous.
The absorber 4 may have a two-layer structure, but preferably has a one-layer structure.
In addition, the disposable diaper may be for infants or adults, may not be a pants-type diaper, and may be a deployable (tape-clamped) disposable diaper or the like.

The present invention further discloses the following embodiments with respect to the above-described embodiments.
<1>
A disposable diaper comprising an absorbent comprising a water-absorbing polymer and pulp fibers,
The absorbent body has a central absorbent body at the crotch part, and side absorbent bodies arranged on both sides of the central absorbent body with a space between the central absorbent body,
Each of the central absorber and the side absorber is divided into a front part and a rear part by an absorbent body width direction center line that bisects the longitudinal length of the absorbent body, and the front part of the central absorbent body When the basis weight ratio of the water-absorbing polymer to the pulp fibers in each of the rear part of the central absorbent body, the front part of the side absorbent body and the rear part of the side absorbent body is CF, CB, SF and SB in this order. Furthermore, the disposable diaper which satisfy | fills the relationship of following formula (1).
CF>CB> SB and CF>SF> SB (1)
<2>
The said center absorber or the said side part absorber is a disposable diaper as described in said <1> in which each said front part and the said back part are continuing physically.
<3>
Disposal according to <2>, wherein the basis weight ratio of the water-absorbing polymer to the pulp fiber is continuously changed from the front part to the rear part in the central absorbent body or the side absorbent body. Diapers.
<4>
The said center absorber and the said side part absorber are disposable diapers as described in said <1> in which the said front part and the said back part are continuing physically.

<5>
In the center absorbent body and the side absorbent body, the basis weight ratio of the water-absorbing polymer to the pulp fiber is continuously changed from the front part to the rear part. Disposable diapers.
<6>
The disposable diaper according to any one of <1> to <5>, wherein a notch is provided at an end of the central absorbent body on the rear side in the longitudinal direction.
<7>
The said center absorber and the said side part absorber are disposable diapers any one of said <1>-<6> currently formed as a different body over the whole longitudinal direction.
<8>
The difference (CF-CB) in the basis weight ratio (polymer ratio) of the water-absorbing polymer to the pulp fiber between the front part of the central absorbent body and the rear part of the central absorbent body is preferably 20 percentage points or more, The disposable diaper according to any one of <1> to <7>, wherein is 50 percentage points or more.
<9>
The difference (CB-SB) in the basis weight ratio (polymer ratio) of the water-absorbing polymer to the pulp fiber between the rear part of the central absorbent body and the rear part of the side absorbent body is 15 percentage points or more, The disposable diaper according to any one of <1> to <8>, which is preferably 30 percentage points or more.

<10>
The difference (CF-SF) in the basis weight ratio (polymer ratio) of the water-absorbing polymer to the pulp fiber between the front part of the central absorbent body and the front part of the side absorbent body is 20 percentage points or more, The disposable diaper according to any one of <1> to <9>, which is preferably 50 percentage points or more.
<11>
The difference (SF-SB) in the basis weight ratio (polymer ratio) of the water-absorbing polymer to the pulp fiber between the front part of the side absorbent body and the rear part of the side absorbent body is 15 percentage points or more. The disposable diaper according to any one of <1> to <10>, which is preferably 30 percentage points or more.
<12>
The width of the separation portion provided between both side portions of the central absorber and the side absorber is 5 mm or more, preferably 10 mm or more, 40 mm or less, preferably 30 mm or less, <1 The disposable diaper according to any one of> to <11>.
<13>
The disposable diaper according to any one of <1> to <12>, wherein the length in the longitudinal direction of the separation part is 200 mm or more, preferably 250 mm or more, 450 mm or less, preferably 400 mm or less. .
<14>
<1> to <<, wherein the core wrap sheet covering the skin contact surface side of the absorbent body and the core wrap sheet covering the non-skin contact surface side of the absorbent body are joined at the separation portion. The disposable diaper of any one of 13>.

<15>
In the front portion of the central absorbent body, the basis weight ratio (polymer ratio) of the water-absorbing polymer to the pulp fiber is preferably 40% or more, more preferably 50% or more, and preferably 200% or less. The disposable diaper according to any one of <1> to <14>, preferably 180% or less.
<16>
In the rear part of the central absorbent body, the basis weight ratio (polymer ratio) of the water-absorbing polymer to the pulp fiber is 20% or more, preferably 150% or less, more preferably 120% or less, The disposable diaper according to any one of <1> to <15>.
<17>
The front portion of the side absorbent body has a basis weight ratio (polymer ratio) of the water-absorbing polymer to the pulp fiber of 20% or more, preferably 150% or less, more preferably 120% or less. The disposable diaper according to any one of <1> to <16>.
<18>
The rear portion of the side absorbent body has a basis weight ratio (polymer ratio) of the water-absorbing polymer to the pulp fiber of 5% or more, preferably 100% or less, more preferably 80% or less. The disposable diaper according to any one of <1> to <17>.
<19>
In the front portion of the central absorbent body, the basis weight of the water-absorbing polymer is preferably 80 g / m ² or more, more preferably 100 g / m ² or more, preferably 180 g / m ² or less, more preferably 160 g. The disposable diaper according to any one of <1> to <18>, which is / m ² or less.

<20>
The rear portion of the central absorbent body has a basis weight of the water-absorbing polymer of preferably 30 g / m ² or more, more preferably 35 g / m ² or more, preferably 100 g / m ² or less, more preferably 80 g. The disposable diaper according to any one of <1> to <19>, which is / m ² or less.
<21>
In the front part of the side part absorbent body, the basis weight of the water-absorbing polymer is preferably 25 g / m ² or more, more preferably 30 g / m ² or more, preferably 100 g / m ² or less, more preferably The disposable diaper according to any one of <1> to <20>, which is 80 g / m ² or less.
<22>
The rear portion of the side absorbent body has a basis weight of the water-absorbing polymer of 10 g / m ² or more, preferably 80 g / m ² or less, more preferably 70 g / m ² or less, <1 The disposable diaper according to any one of> to <21>.
<23>
In the front portion of the central absorbent body, the basis weight of the pulp fibers is preferably 70 g / m ² or more, more preferably 80 g / m ² or more, preferably 170 g / m ² or less, more preferably 160 g / m ^2. m is ² or less, wherein <1> the disposable diaper according to any one of the - <22>.
<24>
In the rear part of the central absorbent body, the basis weight of the pulp fiber is preferably 60 g / m ² or more, more preferably 70 g / m ² or more, and 160 g / m ² or less. The disposable diaper according to any one of <23>.

<25>
In the front portion of the side absorbent body, the basis weight of the pulp fiber is preferably 70 g / m ² or more, more preferably 90 g / m ² or more, and 170 g / m ² or less <1>. The disposable diaper according to any one of to <24>.
<26>
The rear portion of the side absorbent body has a basis weight of the pulp fiber of preferably 100 g / m ² or more, more preferably 120 g / m ² or more, and 200 g / m ² or less, <1> The disposable diaper according to any one of to <25>.
<27>
The central absorbent body has a wide portion with a wider width at the rear part than at the crotch part, and the maximum width of the wide part is between the outer edges of the side absorbent bodies at the crotch part. The disposable diaper according to any one of <1> to <26>, wherein the disposable diaper is made equal to the distance of <1> to <26>.
<28>
The disposable diaper according to <27>, wherein, in the width direction, a ratio between the maximum width of the central absorbent body and the maximum width of the side absorbent body is 2.1 or more and 4.5 or less. .
<29>
In the longitudinal direction, the ratio of the maximum length of the central absorbent body and the maximum length of the side absorbent body is 1.5 or more and 3.0 or less, in the above <1> to <28> The disposable diaper of any one.

<30>
The disposable diaper according to any one of <1> to <29>, wherein the disposable diaper is a pants-type diaper.
<31>
The disposable diaper according to any one of <1> to <29>, wherein the disposable diaper is a deployable diaper.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited to these.

〔Example〕
The absorber similar to the absorber 4 of 1st Embodiment was produced. The form of the absorber was the same as that shown in FIG. The width 7w of the separating portion 7 is 15 mm, the total length L5x in the longitudinal direction X of the central absorbent body 5 is 580 mm, the maximum width L5 of the central absorbent body 5 is 180 mm, the full length L6x in the longitudinal direction X of the side absorbent body is 358 mm, The maximum width L6w of the partial absorber 6 was 33 mm. The thickness of the absorber is substantially constant at a portion other than the separation portion 7 and is 1 mm. As the water-absorbing polymer, a water-absorbing polymer excellent in liquid permeability under pressure was used, and as the pulp fiber, ordinary fluff pulp was used. Table 1 shows the polymer ratio, the basis weight of the pulp fibers, and the basis weight of the water-absorbing polymer in each of the front part 5f and the rear part 5b of the central absorbent body 5, and the front part 6f and the rear part 6b of the side absorbent body 6. Value.
The skin contact surface side of the absorbent body 4 is covered with a core wrap sheet (tissue paper) having a basis weight of 15 g / m ² , and the non-skin contact surface side of the absorbent body 4 is a core wrap sheet having a basis weight of 15 g / m ^2. Covered with tissue paper. In addition, the upper and lower core wrap sheets are joined with an adhesive at the separation part, and at the time of manufacture, it is pushed and adhered with a roll having a convex part on the pattern shape of the separation part, thereby facilitating the formation of a concave part and bending. It is also effective for guiding and moving the liquid.

[Comparative Example 1]
Table 1 shows the polymer ratio, the basis weight of the pulp fiber, and the basis weight of the water-absorbing polymer in each of the front part 5f and the rear part 5b of the central absorbent body 5, and the front part 6f and the rear part 6b of the side absorbent body 6. Except for the value, an absorber was prepared in the same manner as in Example 1.

[Comparative Example 2]
An absorbent body was created in the same manner as in the example except that the absorbent body according to the first embodiment shown in FIG. 3 was changed to one having no separation part. In this case, in the absorbent body, the portion corresponding to the central absorbent body of the embodiment is regarded as the central absorbent body, the portion corresponding to the lateral absorbent body of the embodiment is regarded as the side absorbent body, and the water absorbent polymer and the pulp fiber The basis weight of was measured.

[Comparative Example 3]
Example except that the polymer ratio, the basis weight of the pulp fiber, and the basis weight of the water-absorbing polymer were each made uniform as the central absorbent body 5 and the side absorbent body 6 (each value is shown in Table 1). In the same manner as in No. 1, an absorber was prepared.

[Evaluation]
[Measurement method of pre-diffusion distance, post-diffusion distance, and maximum diffusion distance]
The absorbent body covered with the core wrap sheets of Example 1 and Comparative Examples 1 to 3 was fixed to a 60 ° smooth slope so that the width direction would be up and down, and artificial urine was placed at the injection point of the absorbent body. Were injected at an injection rate of 50 g, 5 g / sec. The injection point was a position 200 mm from the front end of the absorber and a position 95 mm from the lower end of the inclined absorber. Five minutes after the end of the injection, the maximum distance in the longitudinal direction X at which the liquid diffused forward from the injection point was measured to obtain the pre-diffusion distance. Further, 5 minutes after the end of the injection, the maximum distance in the longitudinal direction X at which the liquid diffused backward from the injection point was measured to obtain the post-diffusion distance. Table 1 shows the values of the diffusion distances of the absorbers of Examples and Comparative Examples 1 to 3 in which the maximum diffusion distance is the sum of the pre-diffusion distance and the post-diffusion distance.

  As shown in Table 1, it can be seen from the comparison between the example and the comparative example 2 that the absorbent body of the example is excellent in liquid diffusion backward by having the separation portion. Further, by comparing the example and the comparative example 1, the absorbent body of the example not only has a separation part, but the polymer ratio of each part is excellent in liquid diffusion to the rear by the relationship described above. I understand that From these results, in the absorber of Example 1, the absorption / diffusion of the liquid in the side absorber contributes to the liquid diffusion in the front-rear direction of the absorber, and the entire absorber is effectively utilized. It is suggested. Moreover, although the absorber of the comparative example 3 is excellent in the liquid diffusibility of the front-back direction, when there is much urination amount, there exists a possibility that the liquid which moved to back may leak from the rear end side of an absorber. That is, the absorbent body of the example has excellent fluid diffusibility of the body fluid in the front-rear direction, so that the body fluid can be effectively absorbed by the entire absorbent body, and the absorption performance is excellent. Since the diffusion of the body fluid to the part is controlled more than the front part, the body fluid is less likely to leak from the rear end side of the absorber, and the body fluid leakage prevention performance is excellent.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 4 Absorber 5 Central absorber 5f Front part 5b Rear part 5k Notch part 5x Wide part 5p Front part side edge 5q Rear part side edge part 6 Side part absorber 6f Front part 6b Rear part CF Center Basis weight ratio CB of water-absorbing polymer to pulp fiber in the front part of the absorbent body Basis weight ratio SF of water-absorbing polymer to pulp fiber in the rear part of the central absorbent body SF Water-absorbing polymer to pulp fiber in the front part of the side absorbent body Basis weight ratio SB Basis weight ratio of water-absorbing polymer to pulp fiber in the rear part of the side absorbent body 6w Side edge L5 on the outer side in the width direction of the side absorbent body Maximum width L6 side of the wide part on the rear part side of the central absorbent body Distance between the outer edges of the body absorber C

Claims (5)

A disposable diaper comprising an absorbent comprising a water-absorbing polymer and pulp fibers,
The absorbent body has a central absorbent body at the crotch part, and side absorbent bodies arranged on both sides of the central absorbent body with a space between the central absorbent body,
Each of the central absorber and the side absorber is divided into a front part and a rear part by an absorbent body width direction center line that bisects the longitudinal length of the absorbent body, and the front part of the central absorbent body When the basis weight ratio of the water-absorbing polymer to the pulp fibers in each of the rear part of the central absorbent body, the front part of the side absorbent body and the rear part of the side absorbent body is CF, CB, SF and SB in this order. Furthermore, the disposable diaper which satisfy | fills the relationship of following formula (1).
CF>CB> SB and CF>SF> SB (1)   The disposable diaper according to claim 1, wherein each of the central absorbent body and / or the side absorbent body is physically continuous with the front portion and the rear portion.   The basis weight ratio with respect to the pulp fiber of the water-absorbent polymer continuously changes from the front part to the rear part of the central absorbent body and / or the side absorbent body, respectively. Disposable diapers.   The disposable diaper in any one of Claims 1-3 by which the notch part is provided in the edge part of the longitudinal direction back part side in the said center absorber.   The central absorbent body has a wide portion with a wider width at the rear part than at the crotch part, and the maximum width of the wide part is between the outer edges of the side absorbent bodies at the crotch part. The disposable diaper according to any one of claims 1 to 4, wherein the disposable diaper is made equal to the distance.

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