Absorbent articles

Abstract

To provide an absorbent article making a wearer hardly sense wet feeling or stuffy feeling, and capable of being economically manufactured.SOLUTION: An absorbent article 1 comprises: an abdominal side exterior body 4A arranged at the abdominal side of a wearer in a worn state; a back side exterior body 4B arranged at the back side of the wearer in a worn state; and an absorbent body 2 fixed by bridging between the abdominal side exterior body 4A and the back side exterior body 4B. The absorbent body 2 has an absorber 23, a surface sheet 21 arranged at the skin opposite face side of the absorber 23, a rear face sheet 22 arranged at the non-skin opposite face side of the absorber 23, and a crotch sheet 3 arranged at the non-skin opposite face side of the rear face sheet 22. The crotch sheet 3 contains water absorbing fibers, and a ratio of water absorbing fibers in fibers configuring the crotch sheet 3 is higher than a ratio of water absorbing fibers in fibers configuring a nonwoven fabric configuring the abdominal side exterior body 4A, and a ratio of water absorbing fibers in fibers configuring a nonwoven fabric configuring the back side exterior body 4B.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This invention relates to absorbent articles. [Background technology]

[0002] In absorbent articles such as disposable diapers, a backing sheet is generally placed on the non-skin-facing side of the absorbent material. For example, Patent Document 1 describes using a nonwoven fabric containing a first fiber layer and a second fiber layer located on one main surface of the first fiber layer as the backing sheet of an absorbent article. Patent Document 2 also describes using a moisture-permeable, liquid-impermeable sheet as the backing sheet. The same document also describes placing an outer sheet containing cellulose fibers on the non-skin-facing side of the liquid-impermeable backing sheet in an absorbent article. In the outer sheet described in the same document, the cellulose fibers form multiple fiber clusters. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] International Publication No. 2020 / 004554 Brochure [Patent Document 2] Japanese Patent Publication No. 2017-119024 [Overview of the project] [Problems that the invention aims to solve]

[0004] As described in Patent Document 2, when a moisture-permeable, liquid-impermeable sheet is used as a backing sheet, the humidity inside the absorbent article can be reduced by allowing moisture to escape to the outside of the absorbent article. However, when a moisture-permeable sheet is used as a backing sheet, there is a problem that the moisture released to the outside through the backing sheet can cause clothing located outside the absorbent article to become wet or feel stuffy.

[0005] In this regard, Patent Document 2 attempts to absorb and retain moisture that would otherwise permeate the sheet and be released to the outside of the absorbent article by using a mass of cellulose fibers arranged on the outer surface of a moisture-permeable sheet. However, when moisture is absorbed by a sheet containing water-absorbing fibers such as cellulose fibers, the fibers continue to retain moisture, which may cause the wearer to feel wet or cause skin problems. Furthermore, in Patent Document 2, since the sheet containing water-absorbing fibers is arranged to form the entire outer surface of the absorbent article, there is also the problem that the manufacturing cost is high and it is not economical. Therefore, the object of the present invention is to provide an absorbent article that can overcome the drawbacks of the prior art described above. [Means for solving the problem]

[0006] The present invention relates to an absorbent article comprising an outer ventral body positioned on the wearer's ventral side when worn, a outer ventral body positioned on the wearer's dorsal side when worn, and an absorbent body fixed between the outer ventral body and the outer ventral body, The absorbent body comprises an absorbent body, a surface sheet disposed on the skin-facing side of the absorbent body, a back sheet disposed on the non-skin-facing side of the absorbent body, and a crotch sheet disposed on the non-skin-facing side of the back sheet. The aforementioned crotch sheet contains absorbent fibers, The present invention provides an absorbent article in which the ratio of absorbent fibers in the fibers constituting the crotch sheet is higher than the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the ventral outer casing and the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the dorsal outer casing. [Effects of the Invention]

[0007] According to the present invention, an absorbent article is provided that is less likely to cause the wearer to perceive wetness or stuffiness and can be manufactured economically. [Brief explanation of the drawing]

[0008] [Figure 1]FIG. 1 is a plan view of a pant-type disposable diaper, which is an embodiment of the absorbent article of the present invention, as viewed from the skin-facing side in a state where it is unfolded and maximally extended. [Figure 2] FIG. 2 is a sectional view taken along line II-II of FIG. 1. [Figure 3] FIG. 3 is a sectional view schematically showing a cross section along line III-III (a cross section along the thickness direction and the lateral direction) in the natural state of the diaper shown in FIG. 1.

MODE FOR CARRYING OUT THE INVENTION

[0009] Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings. In FIG. 1, there is shown a pant-type disposable diaper (hereinafter also simply referred to as "diaper") 1, which is an embodiment of the absorbent article of the present invention. As shown in FIG. 1, the diaper 1 has a ventral part A arranged on the ventral side of the wearer and a dorsal part B arranged on the dorsal side in the wearing state, and a crotch part C located between the ventral part A and the dorsal part B. The diaper 1 has a longitudinal direction X corresponding to the direction extending from the ventral part A through the crotch part C to the dorsal part B and a lateral direction Y orthogonal to the longitudinal direction X.

[0010] The diaper 1 includes an absorbent main body 2 and an outer cover arranged on the non-skin-facing side of the absorbent main body 2. The outer cover includes a ventral outer cover 4A arranged on the ventral part A and a dorsal outer cover 4B arranged on the dorsal part B. The ventral outer cover 4A and the dorsal outer cover 4B are independent and separate members from each other. The ventral outer cover 4A mainly forms the front body of the diaper 1. The dorsal outer cover 4B mainly forms the back body of the diaper 1. The absorbent main body 2 is fixed so as to span between the ventral outer cover 4A and the dorsal outer cover 4B.

[0011] It is preferable that both the ventral outer casing 4A and the dorsal outer casing 4B are made of nonwoven fabric. By making the ventral outer casing 4A and the dorsal outer casing 4B from nonwoven fabric, breathability can be provided to these components. This makes it possible to smoothly evaporate sweat from the skin facing the ventral outer casing 4A and the dorsal outer casing 4B when the diaper 1 is worn. The fact that the ventral outer casing 4A and the dorsal outer casing 4B are made of nonwoven fabric is also advantageous in that, in combination with the fact that the crotch sheet 3, which will be described later, contains absorbent fibers, it makes it less likely for the wearer to perceive a feeling of wetness or stuffiness. This advantage will be explained in detail later.

[0012] In diaper 1, the ventral outer casing 4A has both sides 4e, 4e along the longitudinal direction X, and the dorsal outer casing 4B has both sides 4f, 4f along the longitudinal direction X, which are joined together. This joining creates a pair of side seals (not shown), a waist opening (not shown), and a pair of leg openings (not shown) in diaper 1.

[0013] The ventral outer casing 4A and the dorsal outer casing 4B each have, as shown in Figures 1 and 2, an outer layer sheet 42, an inner layer sheet 41 positioned on the skin-facing side of the outer layer sheet 42, and a plurality of elastic members 43 positioned between the two sheets 41 and 42. For the sake of clarity, the elastic members 43 are not shown in Figure 2. The elastic members 43 are thread-like and are arranged to extend along the transverse direction Y of the diaper 1. Multiple elastic members 43 are arranged at intervals along the longitudinal direction X of the diaper 1. In this embodiment, the elastic member 43, positioned to overlap with the absorbent body 2, is arranged in such a way that it does not exhibit elastic stretchability in the region that overlaps with the absorbent body 2 in the thickness direction, by processing such as finely dividing it.

[0014] The absorbent body 2 has a shape that is elongated in the vertical direction X of the diaper 1. As shown in Figure 2, the absorbent body 2 has an absorbent core 23, a surface sheet 21 disposed on the skin-facing side of the absorbent core 23, a back sheet 22 disposed on the non-skin-facing side of the absorbent core 23, and a crotch sheet 3 disposed on the non-skin-facing side of the back sheet 22. The absorbent body 23, like the absorbent main body 2, has a shape that is elongated in the vertical direction X of the diaper 1. The absorbent body 23 is interposed between the surface sheet 21 and the back sheet 22. In this embodiment, as shown in Figure 3, elastic members (hereinafter also referred to as "elastic members for forming absorbent body gathers") 24 are arranged on each side of the absorbent body 23 in the vertical direction X. The elastic members for forming absorbent body gathers 24 are arranged in an extended state along the vertical direction X. The elastic members for forming absorbent body gathers 24 are fixed between the absorbent body 23 and the surface sheet 21. For the sake of explanation, the illustration of the elastic members for forming absorbent body gathers 24 is omitted in Figure 1.

[0015] The surface sheet 21 is permeable to liquids. The surface sheet 21 is generally composed of a hydrophilic nonwoven fabric. The backing sheet 22 is impermeable to liquids or has low liquid permeability. The backing sheet 22 is breathable. Furthermore, the backing sheet 22 is non-absorbent of moisture. The backing sheet 22 is generally composed of a porous film or a hydrophobic composite nonwoven fabric formed by laminating spunbond nonwoven fabric and meltblown nonwoven fabric. Hydrophobicity refers to a property of poor affinity for water, such as having a contact angle of 90° or more with water at 25°C.

[0016] The crotch sheet 3, like the absorbent main body 2, has a shape that is elongated in the longitudinal direction X of the diaper 1. The crotch sheet 3 is continuous in the longitudinal direction X from the ventral outer body 4A to the dorsal outer body 4B. In other words, the crotch sheet 3 is composed of a single sheet that is continuous from the ventral part A, through the crotch area C, to the dorsal part B. The ventral end portion A of the crotch sheet 3 overlaps with the ventral outer casing 4A in a plan view of the diaper 1. On the other hand, the dorsal end portion B of the crotch sheet 3 overlaps with the dorsal outer casing 4B in a plan view of the diaper 1. The lateral length Y of the crotch sheet 3 is either the same as the lateral length Y of the absorbent body 2, or slightly shorter than the lateral length Y of the absorbent body 2, as shown in Figure 1. Figure 1 shows the absorbent body 2 extending outward in the lateral direction Y from each side edge of the crotch sheet 3. The region 3C between the ventral A-side end and the dorsal B-side end of the crotch sheet 3 is located in the crotch area C of the diaper 1. Hereafter, this region 3C will also be referred to as the "crotch region 3C". In the crotch region 3C, the crotch sheet 3 forms the outer surface of the diaper 1. The crotch sheet 3 has a fibrous sheet containing absorbent fibers. Absorbent fibers are present throughout the entire crotch sheet 3. The crotch sheet 3 is breathable and has moisture permeability.

[0017] As described above, the crotch sheet 3 is positioned on the non-skin-facing side of the back sheet 22 and constitutes the outer surface of the diaper 1 in the crotch area 3C. Furthermore, as described above, the crotch sheet 3 contains absorbent fibers. Due to the configuration of the crotch sheet 3, the diaper 1 makes it difficult for the wearer of the diaper 1 or the caregiver, such as the mother, to perceive wetness or stuffiness. This point will be described in detail below.

[0018] As described above, the backing sheet 22 is breathable. Therefore, moisture caused by excrement, etc., absorbed by the absorbent material 23 permeates through the backing sheet 22 and moves to the non-skin-facing side of the backing sheet 22. Since the crotch sheet 3 containing absorbent fibers is placed on the non-skin-facing side of the backing sheet 22, the absorbent fibers can absorb and retain the moisture that has permeated through the backing sheet 22. This effectively prevents the wearer's clothes from getting wet due to moisture that has permeated through the backing sheet 22. As a result, it is possible to prevent the wearer from perceiving a feeling of wetness. Furthermore, since it is possible to prevent the accumulation of moisture between the backing sheet 22 of the diaper 1 and the wearer's clothes, it is also possible to prevent the caregiver from perceiving a feeling of stuffiness when removing the diaper 1 from the wearer. Furthermore, even when the absorbent fibers of the crotch sheet 3 absorb moisture, the skin-facing side of the crotch sheet 3 is lined with a backing sheet 22 that is impermeable to liquid or has low liquid permeability. As a result, the moisture absorbed and retained by the absorbent fibers does not easily come into contact with the wearer's skin, making it difficult for the wearer to perceive wetness. The above advantages are particularly noticeable in the crotch area 3C, or in other words, the crotch area C of the diaper 1, where the crotch sheet 3 is exposed to the outside. Furthermore, by devising the configuration of the ventral outer casing 4A and the dorsal outer casing 4B, the above advantages become particularly noticeable in the ventral part A and the dorsal part B of the diaper 1 as well. This devising will be described in detail below.

[0019] As described above, in diaper 1, the ventral outer layer 4A and the dorsal outer layer 4B are made of nonwoven fabric. Furthermore, the ratio of absorbent fibers in the fibers constituting the crotch sheet 3 is higher than the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the ventral outer layer 4A and the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the dorsal outer layer 4B. This makes it even more difficult for the wearer of diaper 1 to perceive wetness.

[0020] In detail, in the region where the ventral outer casing 4A and the dorsal outer casing 4B overlap with the backing sheet 22 in a plan view, the evaporation of moisture generated from the absorbent material 23 occurs through the moisture-permeable backing sheet 22. In this case, by setting the ratio of absorbent fibers in the ventral outer casing 4A, the dorsal outer casing 4B, and the crotch sheet 3 as described above, the moisture that has permeated through the backing sheet 22 will remain more in the crotch sheet 3, which has a higher absorbent fiber content, than in the ventral outer casing 4A and the dorsal outer casing 4B. As a result, the ventral outer casing 4A and the dorsal outer casing 4B are less likely to get wet from the moisture that has permeated through the backing sheet 22, thus preventing the wearer of the diaper 1 from perceiving a feeling of wetness. Furthermore, in the ventral outer casing 4A and the dorsal outer casing 4B, in a plan view of the diaper 1, the area extending from the back sheet 22 does not contain the back sheet 22; therefore, moisture generated from the absorbent material 23 does not flow through the back sheet 22.

[0021] Furthermore, the manufacturing cost of the diaper 1 can be reduced by adjusting the relationship between the ratio of absorbent fibers in the ventral outer casing 4A, the dorsal outer casing 4B, and the crotch sheet 3 as described above. Since the moisture that permeates through the backing sheet 22 is mainly due to excrement absorbed and retained by the absorbent material 23, the amount of moisture that permeates through the backing sheet 22 tends to be greater in the area located in the crotch C than in the areas located in the ventral A and dorsal B parts of the backing sheet 22. Therefore, by relatively increasing the ratio of absorbent fibers in the crotch sheet 3 located in the crotch C, where the amount of moisture permeating through the backing sheet 22 is relatively large, and decreasing the ratio of absorbent fibers in the ventral outer casing 4A and dorsal outer casing 4B, located in the ventral A and dorsal B parts, where the amount of moisture is relatively small, the amount of absorbent fibers in the components forming the outer surface of the diaper 1 can be reduced, thereby reducing the manufacturing cost of the diaper 1.

[0022] From the viewpoint of making it even more difficult to perceive wetness and stuffiness, and from the viewpoint of reducing the manufacturing cost of diaper 1, the difference between the ratio of absorbent fibers in the fibers constituting the crotch sheet 3 and the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the ventral outer casing 4A, and the difference between the ratio of absorbent fibers in the fibers constituting the crotch sheet 3 and the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the dorsal outer casing 4B are, independently, preferably 0.5% by mass or more, more preferably 1.0% by mass or more, even more preferably 2.0% by mass or more, also preferably 10% by mass or less, more preferably 5.0% by mass or less, even more preferably 3.0% by mass or less, and preferably 0.5% by mass or more and 10% by mass or less, more preferably 1.0% by mass or more and 5.0% by mass or less, and even more preferably 2.0% by mass or more and 3.0% by mass or less.

[0023] If the nonwoven fabric constituting the ventral outer casing 4A has a multi-layer structure, the ratio of absorbent fibers in the fibers constituting the nonwoven fabric means the ratio of absorbent fibers in the layer located on the non-skin-facing side of the nonwoven fabric. The same applies to the dorsal outer casing 4B; if the nonwoven fabric constituting the dorsal outer casing 4B has a multi-layer structure, the ratio of absorbent fibers in the fibers constituting the nonwoven fabric means the ratio of absorbent fibers in the layer located on the non-skin-facing side of the nonwoven fabric.

[0024] If the crotch sheet 3 has a multi-layer structure, the ratio of water-absorbing fibers in the fibers constituting the crotch sheet 3 means the ratio of water-absorbing fibers in the layer of the crotch sheet 3 that contains water-absorbing fibers and has the largest ratio of water-absorbing fibers.

[0025] The ratio of absorbent fibers can be measured by the following method. [Method for measuring the ratio of absorbent fibers] Only the absorbent fibers present in the nonwoven fabric to be measured are dyed. For dyeing, a dye (Aizen Food Coloring, Food Blue No. 1, manufactured by Daiwa Kasei Co., Ltd.) prepared in a 0.5% by mass aqueous solution is used. The nonwoven fabric is immersed in the dye prepared in a 0.5% by mass aqueous solution, left to stand for 3 minutes, then removed and placed on paper (Kimtowels, manufactured by Nippon Paper Crecia Co., Ltd.), and a load of 3 kPa is applied from above the nonwoven fabric for 1 minute to dewater it. This dyes only the absorbent fibers among the constituent fibers. While confirming the location of the dyed absorbent fibers visually or using an optical microscope, non-absorbent fibers are collected from areas that do not contain absorbent fibers and this is used as the non-absorbent sample. If the absorbent and non-absorbent fibers are uniformly mixed throughout and no areas without absorbent fibers can be found, only the non-absorbent fibers are collected using tweezers or similar tools. In this case, the extracted non-absorbent fibers are left to stand for 1 hour in an electric dryer at a temperature of 105±2℃ (for example, manufactured by Isuzu Manufacturing Co., Ltd.). Then, under standard conditions of a temperature of 20±2℃ and a relative humidity of 65±2%, the sample is wrapped in Saran Wrap (registered trademark) manufactured by Asahi Kasei Corporation and placed in a glass desiccator (for example, manufactured by TechJam Co., Ltd.) containing silica gel (for example, manufactured by Toyota Chemical Industries, Ltd.). The sample is left to stand until the fiber sample reaches a temperature of 20±2℃, and this is considered the non-absorbent sample. Non-water-absorbing samples are finely cut, and thermal analysis is performed using a high-sensitivity differential scanning calorimeter (DSC6200, Seiko Instruments Inc.) at a heating rate of 10°C / min to measure the melting peak temperature T1 and its peak area S1 of the components of the non-water-absorbing sample. If multiple peaks are present, the peak with the largest peak area is selected. Next, fiber samples taken from any 10 locations on the nonwoven fabric to be measured are combined into one, and the melting peak temperature and peak area are measured using the method described above. The ratio of absorbent fibers C (mass%) is calculated from the peak area S2 of the peak near the melting peak temperature T1 (within 3°C) of the non-absorbent sample using the following formula. C = (1 - S2 / S1) × 100 The measurement was repeated three times, and the average value was used as the ratio of absorbent fibers.

[0026] The ratio of water-absorbent fibers in the fibers constituting the lower-leg sheet 3 is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, still more preferably 2.0% by mass or more, from the viewpoint of making it difficult to perceive a wet feeling or a stuffy feeling, and is preferably 5.0% by mass or less, more preferably 4.0% by mass or less, still more preferably 3.0% by mass or less, and is preferably 0.5% by mass or more and 5.0% by mass or less, more preferably 1.0% by mass or more and 4.0% by mass or less, still more preferably 2.0% by mass or more and 3.0% by mass or less.

[0027] The basis weight of the water-absorbent fibers in the lower-leg sheet 3 is preferably 0.1 g / m 2 or more, more preferably 0.2 g / m 2 or more, still more preferably 0.3 g / m 2 or more, and is preferably 2.0 g / m 2 or less, more preferably 1.0 g / m 2 or less, still more preferably 0.7 g / m 2 or less, and is preferably 0.1 g / m 2 or more and 2.0 g / m 2 or less, more preferably 0.2 g / m[[ID=二十一]] 2 or more and 1.0 g / m 2 or less, still more preferably 0.3 g / m 2 or more and 0.7 g / m 2 or less.

[0028] The ratio of water-absorbent fibers in the fibers constituting the non-woven fabric constituting the ventral exterior body 4A and the ratio of water-absorbent fibers in the fibers constituting the non-woven fabric constituting the dorsal exterior body 4B are each independently preferably 0% by mass or more, more preferably 0.1% by mass or more, still more preferably 0.3% by mass or more, from the viewpoint of making it difficult to perceive a wet feeling or a stuffy feeling, and are preferably 2.0% by mass or less, more preferably 1.0% by mass or less, still more preferably 0.5% by mass, and are preferably 0% by mass or more and 2.0% by mass or less, more preferably 0.1% by mass or more and 1.0% by mass or less, still more preferably 0.3% by mass or more and 0.5% by mass or less.

[0029] From the viewpoint of making it difficult to perceive wetness and stuffiness, the basis weight of the absorbent fibers in the nonwoven fabric constituting the ventral outer casing 4A and the dorsal outer casing 4B is preferably 1.0 g / m² for each, independently. 2 More preferably, 0.5 g / m 2 More preferably, 0.2 g / m 2 The following applies: The basis weight of the absorbent fibers in the nonwoven fabric may be zero. If the ventral outer casing 4A and / or dorsal outer casing 4B contains absorbent fibers, the lower limit of the basis weight of the absorbent fibers is preferably 0.1 g / m². 2 It can be done this way.

[0030] It is also preferable that the ventral outer casing 4A and the dorsal outer casing 4B do not contain absorbent fibers. This further reduces the amount of moisture absorbed by the ventral outer casing 4A and the dorsal outer casing 4B, which have parts that come into direct contact with the wearer's skin, thus more effectively preventing the wearer of the diaper 1 from perceiving wetness due to the ventral outer casing 4A and the dorsal outer casing 4B. Furthermore, because the ventral outer casing 4A and the dorsal outer casing 4B do not contain absorbent fibers, it is not necessary to use absorbent fibers as constituent materials for the ventral outer casing 4A and the dorsal outer casing 4B when manufacturing the diaper 1, thus further reducing the manufacturing cost of the diaper 1.

[0031] In this specification, "absorbent fiber" refers to a fiber that has the ability to absorb water, that is, to draw up water, and that absorbent fiber is capable of retaining the absorbed water. Specifically, it refers to a fiber with a standard moisture content (the moisture content of the fiber in an environment at a temperature of 20°C and a humidity of 65% RH) of 5% by mass or more. Absorbent fibers may be fibers that are inherently absorbent, or fibers that are not inherently absorbent but have been processed to impart absorbency.

[0032] The basis weight of the absorbent fibers in the crotch sheet 3 may be approximately the same at any point on the crotch sheet 3. Alternatively, the absorbent fibers may be concentrated in a specific area when viewed in plan on the crotch sheet 3.

[0033] The crotch sheet 3 may have a single-layer structure or a multi-layer structure of two or more layers. If the crotch sheet 3 has a multi-layer structure, it is preferable that the absorbent fibers are included in layers other than the layer located on the non-skin-facing side of the crotch sheet 3. This point will be explained with reference to Figure 2. In the diaper 1 shown in Figure 2, the crotch sheet 3 has a three-layer structure. The three layers of the crotch sheet 3 are designated as the first layer 31, the second layer 32, and the third layer 33, in order from the skin-facing side to the non-skin-facing side. It is preferable that the absorbent fibers are included in at least one of the layers other than the third layer 33, i.e., the first layer 31 and the second layer 32. Absorbent fibers may be included in both the first layer 31 and the second layer 32. Alternatively, absorbent fibers may be included only in the first layer 31. Because the absorbent fibers are included in all layers except the third layer 33, which is located on the side furthest from the skin, moisture that has permeated the backing sheet 22 is more easily absorbed by the layers 31 and 32 of the crotch sheet 3 that are located on the side furthest from the skin. Therefore, it is possible to prevent the diaper wearer's clothes from getting wet due to the moisture absorbed and retained by the crotch sheet 3, and to prevent moisture from accumulating between the crotch sheet 3 and the diaper wearer's clothes.

[0034] In the vertical direction X of diaper 1, the length L1 of the crotch sheet 3 and the length L2 of the back sheet 22 may be the same or different. When the length L1 of the crotch sheet 3 and the length L2 of the back sheet 22 are different, it is preferable that the length L1 of the crotch sheet 3 is shorter than the length L2 of the back sheet 22, as shown in Figure 2. By doing so, a relatively large amount of absorbent fibers can be present in the crotch area C, where a relatively large amount of moisture permeates the back sheet 22, making it more efficient to reduce the perception of wetness and stuffiness.

[0035] The ratio (L1 / L2) of the length L1 of the crotch sheet 3 to the length L2 of the back sheet 22 is preferably 0.2 or more, more preferably 0.3 or more, even more preferably 0.4 or more, also preferably 1.0 or less, more preferably 0.8 or less, even more preferably 0.6 or less, and preferably 0.2 to 1.0 or less, more preferably 0.3 to 0.8 or less, even more preferably 0.4 to 0.6 or less.

[0036] In this embodiment, as shown in Figure 3, the absorbent body 2 has a first leak-proof cuff 5 and a second leak-proof cuff 6 on each side of the diaper 1 in the vertical direction X. For the sake of explanation, the first leak-proof cuff 5 and the second leak-proof cuff 6 are not shown in Figure 1. As shown in Figure 3, the first leak-proof cuff 5 has a fixed end 5a at one end in the lateral direction Y, which is fixed to another member. The other end of the first leak-proof cuff 5 in the lateral direction Y is a free end 5b that is not fixed to another member. The first leak-proof cuff 5 has a plurality of elastic members (hereinafter also referred to as "elastic members for forming the first leak-proof cuff") 53 located near the free end of the first leak-proof cuff 5. The elastic members for forming the first leak-proof cuff 53 are arranged in an extended state along the longitudinal direction X. When the diaper 1 is worn, the first leak-proof cuff 5, due to the contraction force of the elastic member 53 for forming the first leak-proof cuff, stands upright towards the wearer at least in the crotch area C, with the free end 5b side using the fixed end 5a as the base end for standing. This prevents the outward leakage of excrement such as urine in the lateral direction Y.

[0037] As shown in Figure 3, the upright portion of the first leak-proof cuff 5 is bent at the bent portion 5c. The bent portion 5c extends along the vertical direction X. The upright portion of the first leak-proof cuff 5 is composed of a first upright portion 51 extending from the fixed end 5a to the bent portion 5c, and a second upright portion 52 extending from the bent portion 5c to the free end 5b, located closer to the wearer's skin than the first upright portion 51. That is, in the upright state, the first upright portion 51 is located on the fixed end 5a side and the second upright portion 52 is located on the free end 5b side. The second upright portion 52 is a band-shaped portion on the free end side of the first leak-proof cuff 5, and the skin-facing surface of the second upright portion 52 can come into contact with the wearer's skin (groin area) when worn. The first upright portion 51 is a portion connected to the second upright portion 52 via the bent portion 5c, and is an upright portion that rises from the fixed end portion 5a toward the skin-facing surface.

[0038] As shown in Figure 3, the second leak-proof cuff 6 has a fixed end 6a at one end in the lateral direction Y, which is fixed to another member. The other end of the second leak-proof cuff 6 in the lateral direction Y is a free end 6b that is not fixed to another member. The free end of the second leak-proof cuff 6 is located further outward in the lateral direction Y of the diaper 1 than the free end of the first leak-proof cuff 5. In this embodiment, it is preferable that the free end of the second leak-proof cuff 6 is located further outward in the lateral direction Y of the diaper 1 than the free end of the first leak-proof cuff 5, both in the natural state and the maximum extended state of the diaper 1. The second leak-proof cuff 6 has a plurality of elastic members (hereinafter also referred to as "second leak-proof cuff forming elastic members") 63 located near the free end of the second leak-proof cuff 6. The second leak-proof cuff forming elastic members 63 are arranged in an extended state along the vertical direction X. When the diaper 1 is worn, the second leak-proof cuff 6, due to the contraction force of the elastic member 63 for forming the second leak-proof cuff, stands upright towards the wearer at least in the crotch area C, with the free end 6b side and the fixed end 6a as the base end. This more effectively prevents the outward leakage of excrement such as urine in the lateral direction Y. Specifically, it effectively prevents leakage outward in the lateral direction Y of excrement that has unintentionally moved beyond the standing first leak-proof cuff 5.

[0039] In the longitudinal direction X of diaper 1, each side edge 3e, 3e of the crotch sheet 3 may or may not reach each side edge 2e, 2e of the absorbent body 2, but it is preferable that they do not reach. By preventing each side edge 3e, 3e of the crotch sheet 3 from reaching each side edge 2e, 2e of the absorbent body 2, it is possible to prevent the side edges 3e of the crotch sheet 3 from rubbing against the wearer's clothing, etc., causing some of the absorbent fibers in the sheet 3 to fall off and adhere to the skin. As described above, the crotch sheet 3 is able to retain moisture due to the absorbent fibers it contains, so the crotch sheet 3 may become wet while wearing diaper 1. If some of the absorbent fibers in the wet crotch sheet 3 fall off and adhere to the skin, it may have an adverse effect on the skin. Because the side edges 3e, 3e of the crotch sheet 3 do not reach the side edges 2e, 2e of the absorbent body 2, it is possible to prevent the side edges 3e of the crotch sheet 3 from rubbing against the wearer's clothing, etc., causing some of the absorbent fibers in the sheet 3 to fall off and adhere to the skin, thus preventing the adverse effects described above. In this embodiment, the side edges 2e, 2e of the absorbent body 2 in the vertical direction X are the side edges of the second leak-proof cuff 6. In the natural state of the diaper 1, it is preferable that the side edges 3e, 3e of the crotch sheet 3 do not reach the side edges 2e, 2e of the absorbent body 2.

[0040] Furthermore, it is preferable that the side edges 3e, 3e of the crotch sheet 3 do not reach the elastic member 63 for forming the second leak-proof cuff. In other words, it is preferable that the crotch sheet 3 does not overlap with the elastic member 63 for forming the second leak-proof cuff in a plan view of the diaper 1. The second leak-proof cuff 6 stands up on the skin-facing side due to the contraction of the elastic member 63 for forming the second leak-proof cuff, so the portion of the second leak-proof cuff 6 where the elastic member 63 for forming the second leak-proof cuff is located may come into close contact with the wearer's skin. By arranging the positional relationship between the crotch sheet 3 and the elastic member 63 for forming the second leak-proof cuff as described above, the crotch sheet 3 can be kept away from the portion of the second leak-proof cuff 6 where the elastic member 63 for forming the second leak-proof cuff is located, which is the portion that comes into close contact with the wearer's skin. This prevents the moisture absorbed and retained by the crotch sheet 3 from moving to the part of the second leak-proof cuff 6 that is in close contact with the wearer's skin, thus further preventing the wearer from perceiving a feeling of wetness. Furthermore, by positioning the crotch sheet 3 and the elastic member 63 for forming the second leak-proof cuff as described above, it is also possible to effectively prevent the side edge 3e of the crotch sheet 3 from rubbing against the wearer's clothing, etc., causing the absorbent fibers in the sheet 3 to fall off and adhere to the skin. In the natural state of the diaper 1, it is preferable that each side edge 3e, 3e of the crotch sheet 3 does not reach the elastic member 63 for forming the second leak-proof cuff.

[0041] When multiple elastic members 63 for forming the second leak-proof cuff are arranged, it is preferable that at least one of the multiple elastic members 63 does not overlap with the elastic member 63 located furthest outward in the lateral direction Y, and more preferably that it does not overlap with the elastic member 63 located furthest inward in the lateral direction Y. The crotch sheet 3 may or may not overlap with the first leak-proof cuff forming elastic member 53 in a plan view of the diaper 1. The crotch sheet 3 may or may not overlap with the elastic member 24 for forming the absorbent gathers in a plan view of the diaper 1.

[0042] In the longitudinal direction of diaper 1, the positions of each side edge 3e, 3e of the crotch sheet 3 may or may not coincide with the positions of each side edge 23e, 23e of the absorbent material 23. If the positions of the side edges 3e of the crotch sheet 3 and the positions of the side edges 23e of the absorbent material 23 do not coincide, either the side edge 3e of the crotch sheet 3 or the side edge 23e of the absorbent material 23 may be located outward in the lateral direction Y. From the viewpoint of ensuring that the crotch sheet 3 absorbs moisture generated from the absorbent material 23 without excess or deficiency, it is preferable that the positions of the side edges 3e, 3e of the crotch sheet 3 in the longitudinal direction X of the diaper 1 coincide with the positions of the side edges 23e, 23e of the absorbent material 23.

[0043] As shown in Figure 1, the ventral outer casing 4A and the dorsal outer casing 4B have areas that overlap with the crotch sheet 3 (hereinafter also referred to as the "overlapping area"). It is preferable that openings are provided in the overlapping region. These openings may be provided in both the overlapping region Ra of the ventral outer casing 4A and the overlapping region Rb of the dorsal outer casing 4B, or in only one of them. If openings are provided in the overlapping regions Ra,Rb of the ventral outer casing 4A or the dorsal outer casing 4B, these openings may be provided on both the skin-facing side and the non-skin-facing side, or on only one of them. Specifically, openings may be provided in both the outer layer sheet 42 and the inner layer sheet 41 of the ventral outer casing 4A or the dorsal outer casing 4B, or in only one of the sheets. It is preferable that multiple openings are provided. In this embodiment, multiple openings are provided in the overlapping region that penetrate the ventral outer casing 4A or the dorsal outer casing 4B. Specifically, multiple openings are provided in the overlapping region Ra of the ventral outer casing 4A that penetrate the ventral outer casing 4A, and it is preferable that these openings penetrate the ventral outer casing 4A. Multiple openings are provided in the overlapping region Rb of the dorsal outer casing 4B that penetrate the dorsal outer casing 4B.

[0044] Because the openings are located in the overlapping regions Ra and Rb, moisture absorbed and retained by the absorbent fibers in the crotch sheet 3 can escape appropriately to the non-skin-facing side of the ventral outer casing 4A or dorsal outer casing 4B in the overlapping region where the crotch sheet 3 is not exposed to the outer surface, thus making it less likely for the ventral outer casing 4A and dorsal outer casing 4B to get wet. As a result, the wearer of the diaper 1 will perceive the feeling of wetness even less. From this viewpoint, it is preferable that the openings are located only on the non-skin-facing side of the ventral outer casing 4A or dorsal outer casing 4B, and more preferably on both the skin-facing side and the non-skin-facing side of the ventral outer casing 4A or dorsal outer casing 4B.

[0045] The method for forming the openings in the ventral outer casing 4A or the dorsal outer casing 4B is not particularly limited. For example, a sheet with pre-distributed openings may be used as the outer layer sheet 42 or the inner layer sheet 41 to form the ventral outer casing 4A or the dorsal outer casing 4B in which the elastic member 43 is arranged in an extended state between the outer layer sheet 42 and the inner layer sheet 41. Alternatively, a sheet without openings may be used as the outer layer sheet 42 or the inner layer sheet 41 to form the ventral outer casing 4A or the dorsal outer casing 4B in which the elastic member 43 is arranged in an extended state between the outer layer sheet 42 and the inner layer sheet 41, and then the openings may be formed. In this embodiment, as described above, the elastic member 43, which is positioned to overlap with the absorbent body 2, is designed not to exhibit elastic stretchability. When dividing the elastic member 43 into smaller pieces, the openings may be formed in the ventral outer casing 4A or the dorsal outer casing 4B by pressing a cutting blade against the outside of the ventral outer casing 4A or the dorsal outer casing 4B. Specifically, after forming a ventral outer casing 4A or a dorsal outer casing 4B in which an elastic member 43 is arranged in an extended state between an outer layer sheet 42 and an inner layer sheet 41, an elastic member cutting means may be used to press a cutting blade against the outside of the ventral outer casing 4A or the dorsal outer casing 4B, corresponding to the position where the absorbent body 2 will be arranged, thereby pressing the elastic member 43 and dividing it into multiple individual pieces so that the contraction function does not manifest, and also forming the aforementioned openings. Examples of the elastic member cutting means include an elastic member dividing section used in the method for manufacturing a composite expandable member described in Japanese Patent Application Publication No. 2002-253605.

[0046] Both the ventral outer casing 4A and the dorsal outer casing 4B may have overlapping regions, or only one of them may have overlapping regions. If both the ventral outer casing 4A and the dorsal outer casing 4B have overlapping regions, the openings may be located in the overlapping regions of both the ventral outer casing 4A and the dorsal outer casing 4B, or the openings may be located in only one of the overlapping regions of the ventral outer casing 4A and the dorsal outer casing 4B. It is preferable that there are multiple openings.

[0047] As the crotch sheet 3, various nonwoven fabrics manufactured by different methods can be used, such as air-through nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, airlaid nonwoven fabric, resin-bonded nonwoven fabric, and meltblown nonwoven fabric. As the crotch sheet 3, one of these nonwoven fabrics can be used alone or two or more can be laminated together. It is preferable that the crotch sheet 3 includes air-through nonwoven fabric. When the crotch sheet 3 includes air-through nonwoven fabric, the crotch sheet 3 tends to be bulkier, and the distance between the absorbent fibers that have absorbed water and the non-skin-facing surface of the diaper 1 tends to increase, making it even more difficult to perceive wetness and stuffiness. For example, the crotch sheet 3 can be made from a single nonwoven fabric consisting of three layers of air-through nonwoven fabric, and it is preferable that the absorbent fibers be contained in the layers other than the layer located closest to the non-skin-facing surface of this nonwoven fabric.

[0048] Absorbent fibers included in the crotch sheet 3, ventral outer casing 4A, or dorsal outer casing 4B include natural fibers, regenerated cellulose fibers such as rayon and lyocell, semi-synthetic cellulose fibers such as acetate fibers, and hydrophilic synthetic fibers such as polyvinyl alcohol fibers and polyacrylonitrile fibers. Among these, natural fibers are preferred. Examples of natural fibers include cotton, wood pulp such as coniferous and hardwood pulp, and hemp fibers, with cotton being preferred among these.

[0049] As the surface sheet 21, a liquid-permeable sheet such as a nonwoven fabric or a perforated film can be used. The surface sheet 21 may have an uneven surface on the side facing the skin. For example, multiple protrusions can be formed in a scattered pattern on the side facing the skin of the surface sheet 21. Alternatively, alternating ridges and grooves extending in one direction can be formed on the side facing the skin of the surface sheet 21. For such purposes, the surface sheet 21 can also be formed using two or more nonwoven fabrics.

[0050] On the other hand, the backing sheet 22 can be, for example, a liquid-impermeable or liquid-difficult-permeable film or a spunbond, meltblown, or spunbond laminated nonwoven fabric. A liquid-impermeable or liquid-difficult-permeable film may be provided with multiple micropores to give the film water vapor permeability. For the purpose of further improving the feel of the absorbent article, a sheet with a good texture, such as a nonwoven fabric, may be laminated to the outer surface of the backing sheet 22.

[0051] The absorbent body 23 is equipped with an absorbent core. The absorbent core is composed of, for example, a stack of hydrophilic fibers such as cellulose including pulp, a mixed stack of hydrophilic fibers and an absorbent polymer, a deposit of an absorbent polymer, or a laminated structure in which an absorbent polymer is supported between two absorbent sheets. The absorbent core may have at least its skin-facing surface covered with a liquid-permeable core wrap sheet, or the entire surface including the skin-facing and non-skin-facing surfaces may be covered with a core wrap sheet. As the core wrap sheet, for example, thin paper made of hydrophilic fibers or a liquid-permeable nonwoven fabric can be used.

[0052] Although the present invention has been described above based on its embodiments, the present invention can be modified as appropriate without being limited to the above embodiments. For example, in the embodiment shown in Figure 1, the crotch sheet 3 has a length in the vertical direction X of the diaper 1 that is longer than the crotch area C, and both ends of the crotch sheet 3 in the vertical direction X overlap with the ventral outer casing 4A or the dorsal outer casing 4B in a plan view of the diaper 1. However, the crotch sheet 3 may also have a length in the vertical direction X that is shorter than the crotch area C. When the length L1 in the vertical direction X of the crotch sheet 3 is shorter than the length in the vertical direction X of the crotch area C, it is preferable that the crotch sheet 3 is located in the crotch area C from the viewpoint of making it difficult to perceive wetness and stuffiness.

[0053] Furthermore, in the embodiment shown in Figure 1, the crotch sheet 3 is continuous from the ventral outer casing 4A to the dorsal outer casing 4B, but it may be divided into multiple sections in the vertical direction X of the diaper 1. Also, the crotch sheet 3 may be divided into multiple sections in the horizontal direction Y of the diaper 1.

[0054] Furthermore, in the above embodiment, a three-layer laminated sheet as shown in Figure 2 was described as an example of a case where the crotch sheet 3 consists of multiple layers of laminated sheets, but the crotch sheet 3 may also have a two-layer structure, or a laminated structure of four or more layers.

[0055] Furthermore, although the above-described embodiment is an example of applying the absorbent article of the present invention to a panty-type disposable diaper, the present invention can be applied to various other types of absorbent articles. For example, the present invention can be applied to absorbent articles such as tape-fastened disposable diapers, sanitary napkins, panty liners, and incontinence pads.

[0056] With regard to the embodiments described above, the present invention further discloses the following absorbent articles. <1> An absorbent article having an outer ventral body positioned on the wearer's ventral side when worn, an outer ventral body positioned on the wearer's dorsal side when worn, and an absorbent body fixed between the outer ventral body and the outer ventral body, The absorbent body comprises an absorbent body, a surface sheet disposed on the skin-facing side of the absorbent body, a back sheet disposed on the non-skin-facing side of the absorbent body, and a crotch sheet disposed on the non-skin-facing side of the back sheet. The aforementioned crotch sheet contains absorbent fibers, An absorbent article in which the ratio of absorbent fibers in the fibers constituting the crotch sheet is higher than the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the ventral outer casing and the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the dorsal outer casing.

[0057] <2> The difference between the ratio of absorbent fibers in the fibers constituting the crotch sheet and the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the ventral outer casing is preferably 0.5% by mass or more and 10% by mass or less, more preferably 1.0% by mass or more and 5.0% by mass or less, and even more preferably 2.0% by mass or more and 3.0% by mass or less. <1> Absorbent articles as described above. <3> The difference between the ratio of absorbent fibers in the fibers constituting the crotch sheet and the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the back outer casing is preferably 0.5% by mass or more and 10% by mass or less, more preferably 1.0% by mass or more and 5.0% by mass or less, and even more preferably 2.0% by mass or more and 3.0% by mass or less. <1> or the above <2> Absorbent articles as described above. <4> The aforementioned crotch sheet has a multi-layer structure of two or more layers, The absorbent fibers are included in the layers of the crotch sheet other than the layer located on the non-skin-facing side. <1> or the aforementioned <3> The absorbent article described in any one of the following. <5> The crotch sheet has a three-layer structure, and when the three layers of the crotch sheet are arranged in order from the skin-facing side to the non-skin-facing side as the first layer, second layer, and third layer, the layers other than the third layer contain the absorbent fiber. <1> or the aforementioned <4> The absorbent article described in any one of the following.

[0058] <6> The ratio of the water-absorbing fibers in the fibers constituting the crotch sheet is 0.5% by mass or more and 5% by mass or less. <1> or the aforementioned <5> The absorbent article described in any one of the following. <7> The ratio of absorbent fibers in the fibers constituting the crotch sheet is more preferably 1.0% by mass or more and 4.0% by mass or less, and even more preferably 2.0% by mass or more and 3.0% by mass or less. <1> or the aforementioned <6> The absorbent article described in any one of the following. <8> The basis weight of the absorbent fibers in the crotch sheet is preferably 0.1 g / m². 2 More than 2.0g / m 2 More preferably, 0.2 g / m 2 More than 1.0g / m 2 More preferably, 0.3 g / m 2 More than 0.7g / m 2 The following is the aforementioned <1> or the aforementioned <7> The absorbent article described in any one of the following. <9> The crotch sheet is made of one of the following: air-through nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, airlaid nonwoven fabric, resin-bonded nonwoven fabric, and meltblown nonwoven fabric, or made of a laminate of two or more of these. <1> or the aforementioned <8> The absorbent article described in any one of the following. <10> The crotch sheet includes an air-through nonwoven fabric, <1> or the aforementioned <9> The absorbent article described in any one of the following.

[0059] <11> In the longitudinal direction of the absorbent article, the length of the crotch sheet and the length of the back sheet are the same. <1> or the aforementioned <10> The absorbent article described in any one of the following. <12> In the longitudinal direction of the absorbent article, the length of the crotch sheet and the length of the back sheet are different, <1> or the aforementioned <10> The absorbent article described in any one of the following. <13> The aforementioned crotch sheet is continuous from the ventral outer casing to the dorsal outer casing, In the longitudinal direction of the absorbent article, the length of the crotch sheet is shorter than the length of the back sheet. <1> or the aforementioned <10> The absorbent article described in any one of the following. <14> In the longitudinal direction of the absorbent article, the ratio of the length L1 of the crotch sheet to the length L2 of the back sheet (L1 / L2) is preferably 0.2 or more and 1.0 or less, more preferably 0.3 or more and 0.8 or less, and even more preferably 0.4 or more and 0.6 or less. <1> or the aforementioned <13> The absorbent article described in any one of the following.

[0060] <15> The ratio of absorbent fibers in the nonwoven fabric constituting the ventral outer casing is preferably 0% by mass or more and 2.0% by mass or less, more preferably 0.1% by mass or more and 1.0% by mass or less, and even more preferably 0.3% by mass or more and 0.5% by mass or less. <1> or the aforementioned <14> The absorbent article described in any one of the following. <16> The ratio of water-absorbing fibers in the fibers constituting the nonwoven fabric constituting the back outer casing is preferably 0% by mass or more and 2.0% by mass or less, more preferably 0.1% by mass or more and 1.0% by mass or less, and even more preferably 0.3% by mass or more and 0.5% by mass or less. <1> or the aforementioned <15> The absorbent article described in any one of the following. <17> The basis weight of the absorbent fibers in the nonwoven fabric constituting the ventral outer casing is preferably 0.1 g / m². 2 More than 1.0g / m 2 More preferably, 0.1 g / m 2 More than 0.5g / m 2 More preferably, 0.1 g / m 2 More than 0.2g / m 2 The following is the aforementioned <1> or the aforementioned <16> The absorbent article described in any one of the following. <18> The basis weight of the absorbent fibers in the nonwoven fabric constituting the back outer casing is preferably 0.1 g / m². 2 More than 1.0g / m 2 More preferably, 0.1 g / m 2 More than 0.5g / m 2 More preferably, 0.1 g / m 2 More than 0.2g / m 2 The following is the aforementioned <1> or the aforementioned <17> The absorbent article described in any one of the following.

[0061] <19> The ventral outer casing and the dorsal outer casing do not contain the absorbent fibers, <1> or the aforementioned <18> The absorbent article described in any one of the following. <20> The absorbent fiber is a natural fiber, a regenerated cellulose fiber such as rayon or lyocell, a semi-synthetic cellulose fiber such as acetate fiber, or a hydrophilic synthetic fiber such as polyvinyl alcohol fiber or polyacrylonitrile fiber. <1> or the aforementioned <19> The absorbent article described in any one of the following. <21> In the longitudinal direction of the absorbent article, each side edge of the crotch sheet does not reach each side edge of the absorbent body, <1> or the aforementioned <20> The absorbent article described in any one of the following. <22> The absorbent body has a first leak-proof cuff and a second leak-proof cuff on each of the longitudinal sides of the absorbent article, The free end of the second leak-proof cuff is located laterally outward from the absorbent article than the free end of the first leak-proof cuff. The second leak-proof cuff has an elastic member extending along the longitudinal direction at a position near the free end of the second leak-proof cuff, The crotch sheet, in a plan view of the absorbent article, does not overlap with the elastic member of the second leak-proof cuff. <1> or the aforementioned <21> The absorbent article described in any one of the following. <23> The position of each side edge of the crotch sheet in the longitudinal direction of the absorbent article coincides with the position of each side edge of the absorbent body, <1> or the aforementioned <22> The absorbent article described in any one of the following. <24> The ventral outer casing or the dorsal outer casing has an area that overlaps with the crotch sheet in a plan view of the absorbent article, An opening is provided in the aforementioned region, <1> or the aforementioned <23> The absorbent article described in any one of the following. <25> The aforementioned opening is an opening that penetrates the ventral outer casing or the dorsal outer casing in the thickness direction. <24> Absorbent articles as described above. <26> The absorbent fiber is a natural fiber. <1> or the aforementioned <25> The absorbent article described in any one of the following. <27> The aforementioned natural fiber is cotton. <26> Absorbent articles as described above. [Explanation of Symbols]

[0062] 1 diaper 2 Absorbent body 21 Surface sheet 22 Back sheet 23 Absorbent 3. Crotch Seat 4A Ventral outer casing 4B Dorsal outer casing 41 Inner layer sheet 42 Outer layer sheet 43 Elastic members L1 Length of the crotch area sheet L2 Vertical length of the back sheet X vertical direction Y (horizontal direction)

Claims

1. An absorbent article having an outer ventral body positioned on the wearer's ventral side when worn, an outer ventral body positioned on the wearer's dorsal side when worn, and an absorbent body fixed between the outer ventral body and the outer ventral body, The absorbent body comprises an absorbent body, a surface sheet disposed on the skin-facing side of the absorbent body, a back sheet disposed on the non-skin-facing side of the absorbent body, and a crotch sheet disposed on the non-skin-facing side of the back sheet. The aforementioned crotch sheet contains absorbent fibers, The ratio of absorbent fibers in the fibers constituting the crotch sheet is higher than the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the ventral outer casing and the ratio of absorbent fibers in the fibers constituting the nonwoven fabric constituting the dorsal outer casing. An absorbent article wherein the ratio of the water-absorbing fibers in the fibers constituting the crotch sheet is 0.5% by mass or more and 5% by mass or less.

2. The aforementioned crotch sheet has a multi-layer structure of two or more layers, The absorbent article according to claim 1, wherein the absorbent fibers are included in layers other than the layer located on the non-skin-facing side of the crotch sheet.

3. The crotch sheet comprises an air-through nonwoven fabric, as described in claim 1 or 2, for the absorbent article.

4. The aforementioned crotch sheet is continuous from the ventral outer casing to the dorsal outer casing, The absorbent article according to claim 1 or 2, wherein in the longitudinal direction of the absorbent article, the length of the crotch sheet is shorter than the length of the back sheet.

5. The absorbent article according to claim 1 or 2, wherein the ventral outer casing and the dorsal outer casing do not contain the water-absorbing fibers.

6. The absorbent article according to claim 1 or 2, wherein each side edge of the crotch sheet in the longitudinal direction of the absorbent article does not reach each side edge of the absorbent body.

7. The absorbent body has a first leak-proof cuff and a second leak-proof cuff on each of the longitudinal sides of the absorbent article. The free end of the second leak-proof cuff is located laterally outward from the absorbent article than the free end of the first leak-proof cuff. The second leak-proof cuff has an elastic member extending along the longitudinal direction at a position near the free end of the second leak-proof cuff, The absorbent article according to claim 1 or 2, wherein the crotch sheet does not overlap with the elastic member of the second leak-proof cuff in a plan view of the absorbent article.

8. The absorbent article according to claim 1 or 2, wherein the position of each side edge of the crotch sheet in the longitudinal direction of the absorbent article coincides with the position of each side edge of the absorbent body.

9. The ventral outer casing or the dorsal outer casing has an area that overlaps with the crotch sheet in a plan view of the absorbent article, The absorbent article according to claim 1 or 2, wherein an opening is provided in the region.

10. The absorbent article according to claim 9, wherein the opening is an opening that penetrates the ventral outer casing or the dorsal outer casing in the thickness direction.

11. The absorbent article according to claim 1 or 2, wherein the absorbent fiber is a natural fiber.

12. The absorbent article according to claim 11, wherein the natural fiber is cotton.

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