Absorbent article

Abstract

To improve anti-reversal and diffusion properties while suppressing decline in an absorption rate.SOLUTION: An absorbent article has an intermediate sheet 40 interposed between a top sheet 30 and an absorbent body 56, the intermediate sheet 40 is a hydrophilic laminated nonwoven fabric consisting of a plurality of long fiber layers, the plurality of long fiber layers includes at least one first fiber layer 41 made of crimped long fibers with a fineness of 1.5 to 6.0 dtex and at least one second fiber layer 42 made of crimped long fibers with a fineness of 1.5 to 6.0 dtex, the number of crimp fibers in the first fiber layer 41 is less than the number of crimp fibers in the second fiber layer 42, a surface layer forming the surface of the intermediate sheet 40 is the first fiber layer 41, the density of the first fiber layer 41 and the density of the second fiber layer 42 are 19,000 to 60,000 g / m3, the apparent thickness of the second fiber layer 42 is 0.2 to 0.8 mm, and the apparent thickness of the surface layer is 0.9 to 1.1 times the apparent thickness of the second fiber layer 42.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] This invention relates to absorbent articles such as disposable diapers, sanitary napkins, and pet sheets. [Background technology]

[0002] Absorbent materials require various absorption properties. Typical absorption properties include absorption rate, backflow prevention, and diffusion. Backflow is the phenomenon where the liquid portion of excrement that has permeated the top sheet returns to the surface of the top sheet. If backflow is frequent, it can cause discomfort to the wearer or lead to skin problems, so products that are resistant to backflow are desired. A similar problem arises if the absorption rate is slow. On the other hand, if the diffusion is low, the supply range of liquid in the absorbent material does not expand easily, so even if a large amount of absorption capacity is ensured for the absorbent material as a whole, absorption is easily saturated, and the absorption rate may decrease or backflow may become more likely when absorption is repeated.

[0003] One of the typical methods for improving backflow prevention and diffusion is the use of an intermediate sheet interposed between the top sheet and the absorber (see, for example, Patent Document 1). Various nonwoven fabrics have been used as intermediate sheets depending on the purpose. If the goal is simply to improve the absorption rate, a low-density nonwoven fabric with a low fiber density can be used as the intermediate sheet.

[0004] However, if the intermediate sheet is simply a low-density nonwoven fabric, the backflow prevention and diffusion properties deteriorate. Therefore, it is desirable to improve backflow prevention and diffusion properties while suppressing the decrease in absorption rate. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2021-78872 [Overview of the project] [Problems that the invention aims to solve]

[0006] Therefore, the main objective of the present invention is to improve backflow prevention and diffusivity while suppressing a decrease in absorption rate. [Means for solving the problem]

[0007] The absorbent articles that solve the above problems are as follows: <First aspect> It has a liquid-permeable top sheet, an absorbent positioned behind the top sheet, and an intermediate sheet interposed between the top sheet and the absorbent. The aforementioned intermediate sheet is a hydrophilic laminated nonwoven fabric consisting of multiple long fiber layers. The plurality of long fiber layers include at least one first fiber layer consisting of crimped or non-crimped long fibers with a fineness of 1.5 to 6.0 dtex, and at least one second fiber layer consisting of crimped long fibers with a fineness of 1.5 to 6.0 dtex. The number of crimps of the fibers in the first fiber layer is less than the number of crimps of the fibers in the second fiber layer. The surface layer forming the surface of the intermediate sheet is the first fiber layer, The density of the first fiber layer and the density of the second fiber layer are 19,000 to 60,000 g / m³. 3 And, The apparent thickness of the second fiber layer is 0.2 to 0.8 mm, and the apparent thickness of the surface layer is 0.9 to 1.1 times the apparent thickness of the second fiber layer. An absorbent article characterized by the following features.

[0008] (Effects and Benefits) This absorbent article is characterized by the use of a hydrophilic laminated nonwoven fabric as an intermediate sheet, comprising a first fiber layer consisting of un-crimped or crimped long fibers having a specific density and thickness, and a second fiber layer consisting of crimped long fibers with a higher crimp count than the first fiber layer, also having a specific density and thickness, with the surface layer being the first fiber layer. In this case, although both the first and second fiber layers are long fiber layers, they have sufficiently low density, resulting in excellent liquid permeability for the intermediate sheet as a whole. Here, the first fiber layer has fewer crimp counts than the second fiber layer, resulting in lower liquid retention and higher directional dependence of diffusion (tendency to diffuse in the direction of fiber orientation). On the other hand, the second fiber layer, located behind the surface layer, not only has more crimp counts than the first fiber layer but also sufficient thickness, resulting in higher liquid retention and lower directional dependence of diffusion compared to the first fiber layer. Therefore, the entire middle seating arrangement is as follows: (a) By having a first fiber layer and a second fiber layer with sufficiently low density, the decrease in absorption rate is suppressed, (b) By including a second fiber layer with low directional dependence of diffusion, the diffuseness is improved, and further (c) Because the first fiber layer, which has relatively low liquid retention, forms the surface layer, even if the second fiber layer has relatively high liquid retention, backflow is less likely. As a result, especially when the excrement is watery or soft, the liquid can be transferred to the absorbent layer more quickly and in greater quantities, with less backflow. Furthermore, since the intermediate sheet is a long-fiber nonwoven fabric, it has the advantage of superior strength compared to short-fiber nonwoven fabrics. Additionally, because the intermediate sheet is located between the top sheet and the absorbent layer, if the absorbent layer contains superabsorbent polymer particles, the superabsorbent polymer that escapes from the absorbent layer remains in the second fiber layer with a high crimp count, making it less likely to escape to the first fiber layer and the surface of the top sheet. Furthermore, the liquid retention and diffusion properties based on this layered structure are achieved precisely because the intermediate sheet is located between the top sheet and the absorbent.

[0009] <Second aspect> The aforementioned intermediate sheet has a back layer that forms the back surface, which is a second fiber layer. The strike-through with the front surface of the intermediate sheet facing up is 0.9 to 1.8 seconds for the first time and is shorter than the strike-through with the back surface of the intermediate sheet facing up. The liquid flow in the longitudinal direction on the front surface of the intermediate sheet is 30 to 45 cm. The liquid flow in the width direction on the front surface of the intermediate sheet is 20 to 40 cm. The reverse return with the front surface of the intermediate sheet facing up is 0.05 to 0.1 g and is less than the reverse return with the back surface of the intermediate sheet facing up. An absorbent article according to the first aspect.

[0010] (Function and effect) As the intermediate sheet, those having a layer structure and characteristics as in this aspect are suitable.

[0011] <The third aspect> The hydrophilic laminated nonwoven fabric is formed by bonding composite fibers by hot air adhesion without using a thermal calender. The fineness of the long fibers in the first fiber layer is 0.9 to 1.1 times the fineness of the long fibers in the second fiber layer. The second fiber layer is composed of eccentric core-sheath type or side-by-side composite fibers. [[ID=?]]An absorbent article according to the first or second aspect.

[0012] (Function and effect) Since the long fibers in the first fiber layer and the long fibers in the second fiber layer have substantially the same thickness and the fibers are bonded by hot air adhesion without using a thermal calender, the intermediate sheet as a whole is excellent in integrity, texture, and strength. Also, since it is a long fiber nonwoven fabric, it has the aforementioned performance, particularly density and thickness, which is preferable. Further, since the second fiber layer is composed of side-by-side composite fibers, the fibers in the second fiber layer have three-dimensional crimps mainly consisting of spiral crimps, and the aforementioned characteristics of the second fiber layer become more prominent, which is preferable.

[0013] <The fourth aspect> The topsheet is a perforated nonwoven fabric in which holes penetrating through the front and back are provided at intervals in a predetermined pattern. It should be noted that there seems to be an error in the original text where the "[[ID=?]]" should be corrected to something like "" for proper sequential numbering. Also, please check if the content is complete and accurate as per your requirements. If you have any further clarifications or corrections, feel free to let me know. The area of ​​the aforementioned hole is 0.7 to 10.0 mm². 2 The area ratio of holes in the top sheet is 5-50%. An absorbent article in any one of the first to third embodiments.

[0014] (Effects and Benefits) When a perforated nonwoven fabric as described in this embodiment is used as the top sheet, backflow of liquid from the perforated portion becomes significant. However, by having the aforementioned intermediate sheet, the reduction in absorption rate is suppressed, and backflow prevention and diffusion properties are improved, especially when absorbing the liquid portion of soft stool.

[0015] <Fifth aspect> A wearable article having an elastic member that is contracted in its natural length state and has an expandable and expandable region, The region having the top sheet and the absorbent, and having a region that is pressed against the wearer by the contraction force of the elastic member, The region having the aforementioned intermediate sheet, and which does not have a region that is pressed against the wearer by the contraction force of the elastic member, An absorbent article in any one of the first to fourth embodiments.

[0016] (Effects and Benefits) In wearable items such as diapers and sanitary napkins, the area containing the top sheet and absorbent core is often pressed against the body surface by the contractile force of the elastic material in the stretchable area to increase adhesion. However, such areas tend to wrinkle and retain moisture easily. On the other hand, the second fiber layer of the intermediate sheet has high liquid retention properties, so even though it has a surface layer made of the first fiber layer, there is a risk of leakage in areas prone to wrinkles. Therefore, in wearable items with such stretchable areas, it is preferable that the area containing the intermediate sheet does not have an area where adhesion to the wearer is increased by the contractile force of the elastic material. [Effects of the Invention]

[0017] According to the present invention, advantages such as the ability to suppress the decrease in absorption rate while improving backflow prevention and diffusivity are obtained. [Brief explanation of the drawing]

[0018] [Figure 1] This is a plan view showing the inside of a tape-type disposable diaper in its unfolded state. [Figure 2] This is a plan view showing the outer surface of a tape-type disposable diaper in its unfolded state. [Figure 3] This is a cross-sectional view taken along line 6-6 in Figure 1. [Figure 4] This is a cross-sectional view taken along line 7-7 in Figure 1. [Figure 5] This is a cross-sectional view taken along line 5-5 in Figure 1. [Figure 6] This is a cross-sectional view taken along line 9-9 in Figure 1. [Figure 7] This is a disassembled assembly diagram of the main components. [Figure 8] This is a plan view showing a magnified view of the main parts. [Figure 9] (a) A cross-sectional view of line 8-8 in Figure 1, and (b) a schematic cross-sectional view showing its upright position. [Figure 10] This is a plan view showing a magnified view of the main parts. [Figure 11] This is a plan view showing a magnified view of the main parts. [Figure 12] This is a cross-sectional view illustrating the layer structure of the intermediate sheet. [Figure 13] This is a plan view showing an example of a hole pattern. [Figure 14] This photograph shows the spread of what appears to be loose stool. [Modes for carrying out the invention]

[0019] The embodiments for carrying out the present invention will be described in detail below, using tape-type disposable diapers as an example. Each adjacent component in the thickness direction is fixed or joined in the same way as known diapers, as necessary, even in addition to the fixing or joining parts described below. The dotted pattern in the cross-sectional view indicates an adhesive such as a hot melt adhesive as a fixing or joining means. The hot melt adhesive can be applied by known methods such as slot coating, continuous linear or dotted bead coating, spiral, Z-shaped, or wavy spray coating, or pattern coating (transfer of hot melt adhesive using a relief printing method). Alternatively, or in conjunction with these methods, in the fixing part of an elastic member, the hot melt adhesive can be applied to the outer surface of the elastic member to fix the elastic member to the adjacent member. Examples of hot melt adhesives include EVA-based, adhesive rubber-based (elastomer-based), polyolefin-based, and polyester / polyamide-based adhesives, but they can be used without particular limitation. As a fixing or joining means for joining each component, means of material welding such as heat sealing or ultrasonic sealing can also be used. In areas where liquid permeability in the thickness direction is required, adjacent components in the thickness direction are fixed or joined in an intermittent pattern. For example, when such intermittent fixing or joining is performed with hot melt adhesive, intermittent pattern coating such as spiral, Z-shaped, or wavy can be suitably used. When coating an area exceeding the coating width of a single nozzle, intermittent pattern coating such as spiral, Z-shaped, or wavy can be performed with or without gaps in the width direction. As a joining means for joining each component, material welding methods such as heat sealing or ultrasonic sealing can also be used.

[0020] Furthermore, unless otherwise specified, known nonwoven fabrics can be used as nonwoven fabrics in the following description, depending on the part and purpose. The constituent fibers of the nonwoven fabric can be selected without particular limitation, including synthetic fibers such as polyethylene or polypropylene (polyolefins), polyesters, and polyamides (including single-component fibers as well as composite fibers such as core-sheaths), as well as regenerated fibers such as rayon and cupro, and natural fibers such as cotton. These can also be used in mixtures. To increase the flexibility of the nonwoven fabric, it is preferable to use crimped fibers as constituent fibers. In addition, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including fibers that have become hydrophilic due to a hydrophilizing agent), hydrophobic fibers, or water-repellent fibers (including fibers that have become water-repellent due to a water-repellent agent). Furthermore, nonwoven fabrics are generally classified according to the length of the fibers, the sheet formation method, the fiber bonding method, and the lamination structure into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through, etc.) nonwoven fabrics, needle punch nonwoven fabrics, point bond nonwoven fabrics, and laminated nonwoven fabrics (including SMS nonwoven fabrics and SMMS nonwoven fabrics, etc., which have a meltblown layer sandwiched between spunbond layers), and any of these nonwoven fabrics can be used.

[0021] Figures 1 to 9 show an example of a tape-type disposable diaper. In the figures, the symbol X indicates the total width of the diaper excluding the connecting tape 13, and the symbol L indicates the total length of the diaper. This tape-type disposable diaper has a crotch area including the center of the anterior-posterior direction LD, a ventral portion F extending forward from the center of the anterior-posterior direction LD, and a dorsal portion B extending backward from the center of the anterior-posterior direction LD. This tape-type disposable diaper also has an absorbent material 56 positioned behind the top sheet 30, and an intermediate sheet 40 interposed between the top sheet 30 and the absorbent material 56. In the illustrated example, there is also a liquid-impermeable sheet 11 covering the back of the absorbent material 56, and an outer nonwoven fabric 12 covering the back of the liquid-impermeable sheet 11 and forming the outer surface of the product.

[0022] The following describes the materials and distinctive features of each part in order. (Absorbent) The shape of the absorbent body 56 can be a rectangle as shown in the illustration, or it can be a shape with a constriction along the legs in the middle in the front-to-back direction (like an hourglass), etc., as appropriate. Reference numeral 56x indicates the total width of the absorbent body 56. The absorbent body 56 is the part that absorbs and retains excretory fluid, and can be formed from an aggregate of fibers. As for this fiber aggregate, in addition to stacked short fibers such as pulp fibers and synthetic fibers, a filament aggregate obtained by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate as needed can also be used. As for the fiber basis weight, when stacking pulp fibers or short fibers, for example, 100 to 450 g / m² 2 It can be set to a certain extent, and in the case of filament aggregates, for example, 30-120 g / m². 2 The fineness can be set to a certain degree. In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of filament aggregates, the filaments may be non-crimped fibers, but crimped fibers are preferred.

[0023] Pulp fibers can be used without particular limitations, as long as they are fibers extracted from wood, grass, or other plants by mechanical and / or chemical processing. As raw materials for pulp fibers, in addition to coniferous trees and hardwoods, bamboo, rice, kudzu, pampas grass, hemp, sugarcane, etc. can also be used. Artificial celluloses such as rayon and acetate can also be used. As pulp fibers, in addition to coniferous tree pulp fibers (pulp fibers derived from coniferous trees), hardwood pulp fibers (pulp fibers derived from hardwoods) which have a shorter average fiber length than coniferous tree pulp fibers can also be used, and either one of these may be used alone or both may be used in mixtures. Furthermore, the pulp fibers may contain recycled pulp fibers. For example, the pulp fibers may contain recycled coniferous tree pulp fibers and recycled hardwood pulp fibers.

[0024] In an absorbent material 56 made by mixing coniferous pulp fibers and hardwood pulp fibers, the fiber density is higher than that of an absorbent material 56 made solely of coniferous pulp fibers, which was commonly used in the past, because it includes not only fibers that are relatively long and wide, but also fibers that are relatively short and narrow. Therefore, not only is the liquid retention capacity of the fibers due to capillary action improved, but the superabsorbent polymer particles within the absorbent material 56 (between the pulp fibers) are also improved. child It is particularly preferable because it also improves retention.

[0025] Both the hardwood pulp fibers and softwood pulp fibers are preferably bleached hardwood kraft pulp (LBKP) and bleached softwood kraft pulp (NBKP) produced by the kraft process, but other materials such as soda pulp, sulfite pulp, chemothermetic pulp, chemi-finer mechanical pulp, and thermochemimetic pulp may also be used.

[0026] When using a mixture of coniferous pulp fibers and hardwood pulp fibers, the content of coniferous pulp fibers and hardwood pulp fibers in the total pulp fibers is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, and even more preferably 98% by mass or more. In particular, it is preferable that the total pulp fibers in the absorbent body 56 consist substantially of coniferous pulp fibers and hardwood pulp fibers. Furthermore, the mass ratio of hardwood pulp fibers to other pulp fibers such as coniferous pulp fibers is not limited and can be, for example, 10 / 90 to 90 / 10, but from the viewpoint of operability, it is preferably 20 / 80 to 50 / 50, more preferably 25 / 75 to 38 / 62, even more preferably 25 / 75 or more and less than 38 / 62, even more preferably 26 / 74 to 36 / 64, and particularly preferably 28 / 72 to 35 / 65. In this specification, unless otherwise specified, the amount of pulp fibers or the material thereof refers to the amount added in an oven-dry state, i.e., the mass percentage in an oven-dry state.

[0027] When the absorbent material 56 contains hardwood pulp fibers, it is preferable that the proportion of pulp fibers with a fiber length of 0.5 mm or more and less than 1.1 mm is 40% or more by mass, and the proportion of pulp fibers with a fiber width of 10 μm or more and less than 35 μm is 90% or more by mass. Furthermore, the proportion of pulp fibers with a fiber length of 0.5 mm or more and less than 1.1 mm is preferably 42.6% or more, more preferably 43% or more, even more preferably 43.2% or more, 43.7% or more, and 45% or more. % The above can be achieved. Furthermore, the proportion of pulp fibers with a fiber width of 10 μm or more and less than 35 μm can preferably be 90.6% or more, more preferably 91.0% or more, even more preferably 91.2% or more, or 91.4% or more. In this way, by having the absorbent 56 contain specific pulp fiber lengths and specific pulp fiber widths within specific ranges, the advantages of using hardwood pulp fibers are further enhanced. There is no particular upper limit to the proportion of pulp fibers with a fiber length of 0.5 mm or more and less than 1.1 mm, but due to variations in fiber length resulting from the pulp being a natural material, it may be 80% by mass or less, 60% by mass or less, or 55% by mass or less. Similarly, there is no particular upper limit to the proportion of pulp fibers with a fiber width of 10 μm or more and less than 35 μm, but it may be 98% by mass or less, 95% by mass or less, or 94% by mass or less.

[0028] Furthermore, the fiber length and fiber width of pulp fibers can be measured using the measuring instrument "VALMET FS5" in accordance with JIS-P8226:2011 (ISO16065-2:2007) "Pulp - Method for measuring fiber length by automated optical analysis".

[0029] Furthermore, when the absorbent material 56 contains hardwood pulp fibers, the average fiber length when pulp fibers with a fiber length of 0.5 mm or more and less than 1.1 mm are measured at 0.02 mm intervals (with a classification width of 0.02 mm) can be set to 0.5 to 0.8 mm, preferably 0.6 to 0.7 mm. This makes it possible to suppress variations in the distribution of voids that may occur in the absorbent material 56 depending on the orientation direction of the pulp fibers.

[0030] Furthermore, when the absorbent material 56 contains hardwood pulp fibers, the standard deviation σ when measuring pulp fibers with a fiber length of 0.5 mm or more and less than 1.1 mm at 0.02 mm intervals (with a classification width of 0.02 mm) can be 0.58 mm or less, preferably 0.56 mm or less, more preferably 0.54 mm or less, and even more preferably 0.50 mm or less. Having the standard deviation within the above range further enhances the advantages of using hardwood pulp fibers.

[0031] Furthermore, when pulp fibers with a fiber width of 10 μm or more and less than 35 μm are measured at 1 μm intervals (with a classification width of 1 μm), the average fiber width is 15 μm or more and 30 μm or less, preferably 18 μm. m The average fiber width can be set to 27 μm or less. By keeping the average fiber width within the above range, it is possible to maintain an appropriate amount of space between fibers and prevent a decrease in absorption rate.

[0032] When pulp fibers with a fiber width of 10 μm or more and less than 35 μm are measured at 1 μm intervals (with a classification width of 1 μm), the standard deviation σ can be 2.9 μm or less, preferably 2.8 μm or less, more preferably 2.75 μm or less, even more preferably 2.6 μm or less, and 2.59 μm or less. By setting the standard deviation within the above range, the advantages of using hardwood pulp fibers become even more apparent.

[0033] (Highly absorbent polymer particles) The absorbent material 56 may contain superabsorbent polymer particles in part or in whole. Superabsorbent polymer particles include not only "particles" but also "powder." Superabsorbent polymer particles used in this type of disposable diaper can be used as they are. The pre-swell particle size (particle size when liquid has not been absorbed) of the superabsorbent polymer particles is not particularly limited, but it is preferable that superabsorbent polymer particles with a pre-swell particle size of more than 150 μm and 850 μm or less account for 60% by mass or more of the total amount, more preferably 70% by mass or more, and particularly preferable 80% by mass or more. Furthermore, it is preferable that superabsorbent polymer particles with a pre-swell particle size shorter than the average fiber length of the hardwood pulp fibers (for example, 600 μm or less, more preferably 500 μm or less) account for 60% by mass or more of the total amount, more preferably 70% by mass or more, and particularly preferable 80% by mass or more.

[0034] The particle size distribution of superabsorbent polymer particles can be determined by setting standard sieves (e.g., standard sieves manufactured by Tokyo Screen Co., Ltd.) and receiving trays with mesh sizes of 850 μm, 600 μm, 500 μm, 355 μm, 300 μm, 250 μm, and 150 μm, as specified in JIS Z 8801, in this order from top to bottom in a shaker (e.g., Retsch AS200 model), and sieving the entire amount of superabsorbent polymer particles into the top sieve. The shaking conditions are 50 Hz, amplitude 0.5 mm, and shaking time 10 minutes. The sieving is performed in an environment with a temperature of 23 ± 2 °C and a humidity of 50 ± 5%, and the sample should be stored in the same environment for at least 24 hours before measurement. The sieving is performed three times, and the average value of the three measurements is taken as the sieve mass for each sieve. From the mass of the superabsorbent polymer particles on each sieve and the total mass (mass of all superabsorbent polymer particles), the content ratio (mass percentage) of the particle size range corresponding to each sieve (i.e., over 850 μm, over 600 μm and up to 850 μm, over 500 μm and up to 600 μm, over 355 μm and up to 500 μm, over 300 μm and up to 355 μm, over 250 μm and up to 300 μm, over 150 μm and up to 250 μm, and 150 μm and up) can be determined. Furthermore, if a particle size distribution is determined based on this particle size distribution, and the particle diameter corresponding to the median cumulative value (50%) of the cumulative curve is taken as the average particle size, then the average particle size of the superabsorbent polymer particles is preferably in the range of 355 to 500 μm, and more preferably in the range of 370 to 470 μm.

[0035] While there are no particular limitations on the material used for the superabsorbent polymer particles, those with a water absorption capacity of 40 g / g or more are preferred. Examples of superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymers (polyacrylate-based, polysulfonate-based, maleate anhydride-based), and can be used such as starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked sodium carboxymethylcellulose, and acrylic acid (salt) polymers. The shape of the superabsorbent polymer particles is preferably the commonly used granular form, but other shapes can also be used.

[0036] As the highly absorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less, are preferably used. If the water absorption rate is too slow, so-called reverse flow, in which the liquid supplied into the absorber 56 flows back outside the absorber 56, is likely to occur.

[0037] Further, as the highly absorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even when the absorber 56 is bulky, the sticky feeling after liquid absorption can be effectively suppressed.

[0038] The basis weight of the highly absorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorber 56. Therefore, although it cannot be generally stated, in the normal case, it can be 50 to 350 g / m 2 , preferably 100 to 300 g / m 2 . For example, in the case of disposable diapers, the basis weight of the highly absorbent polymer particles can be 50 to 300 g / m 2 , preferably 100 to 250 g / m 2 . Further, for example, in the case of sanitary napkins, the basis weight of the highly absorbent polymer particles in the absorber 56 (when the absorber 56 is composed of multiple layers, the basis weight of the entire multiple layers) can be 70 to 470 g / m 2 , preferably 140 to 240.

[0039] The ratio of pulp fibers and highly absorbent polymer particles in the absorber 56 is not particularly limited, and for example, the pulp fiber: highly absorbent polymer particle can be 40:60 to 65:35 by weight ratio.

[0040] (Packaging sheet) To prevent the superabsorbent polymer particles from escaping, or to improve the shape retention of the absorbent body 56, the absorbent body 56 can be incorporated as an absorbent element 50 wrapped in a packaging sheet 58. As the packaging sheet 58, tissue paper, especially crepe paper, nonwoven fabric, poly-laminated nonwoven fabric, or a sheet with small holes can be used. However, it is desirable that the sheet prevents the superabsorbent polymer particles from escaping. When using nonwoven fabric instead of crepe paper, hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and its material can be polypropylene, polyethylene / polypropylene, etc. The fiber weight should be 5-40 g / m². 2 Especially 10-30g / m 2 That would be preferable.

[0041] As shown in Figure 3, the packaging sheet 58 may be structured to wrap the entire absorbent material 56 with a single sheet, or it may be constructed to wrap the entire absorbent material 56 with multiple sheets, such as two sheets for the top and bottom. Furthermore, as shown in the illustrated example, the packaging sheet 58 may have portions extending from the front and back of the absorbent material 56. The packaging sheet 58 may also be omitted.

[0042] (Top sheet) The top sheet 30 is permeable to liquids, and can be, for example, a non-porous nonwoven fabric, a perforated nonwoven fabric or a perforated plastic sheet, in which holes 31 penetrating through the front and back are provided at intervals in a predetermined pattern, as shown in Figure 13. The pattern of the holes 31 is not particularly limited and may be arranged in a Moroccan pattern as shown in Figure 13(a), or in a staggered pattern as shown in Figure 13(b). In the Moroccan pattern arrangement, groups of holes 31 arranged in a single wave-like pattern following the front-to-back direction LD are spaced apart and arranged in opposite phases in the width direction WD, and the imaginary lines connecting the holes form a Moroccan pattern (vertical wave pattern).

[0043] The top sheet 30 extends from the front to the rear of the product in the front-to-back direction (LD) and laterally beyond the absorbent 56 in the width direction (WD). However, as needed, the width of the top sheet 30 can be made shorter than the total width of the absorbent 56, for example, when the starting point of the rise-up gather 60 (described later) is located closer to the center in the width direction (WD) than the side edge of the absorbent 56.

[0044] (Intermediate sheet) An intermediate sheet 40 is provided between the top sheet 30 and the absorbent 56. Preferably, the intermediate sheet 40 is adjacent to the back surface of the top sheet (in this case, also called the "second sheet") as shown in the illustrated example, but it may be provided at any other position between the top sheet 30 and the absorbent 56. The top sheet 30 and the intermediate sheet 40 can be joined by welding or hot melt adhesive. Furthermore, it is preferable that the intermediate sheet 40 is adjacent to the surface of the absorbent element, and if there is no packaging sheet on at least the surface of the absorbent element, it is preferable that it is adjacent to the surface of the absorbent 56. The intermediate sheet 40 and the absorbent element 56 can be joined by welding or hot melt adhesive.

[0045] The intermediate sheet 40 is a hydrophilic laminated nonwoven fabric consisting of multiple long fiber layers, each of which includes at least one first fiber layer 41 consisting of crimped or non-crimped long fibers with a fineness of 1.5 to 6.0 dtex, and at least one second fiber layer 42 consisting of crimped long fibers with a fineness of 1.5 to 6.0 dtex, the crimp count of the fibers in the first fiber layer 41 is less than the crimp count of the fibers in the second fiber layer 42, the surface layer forming the surface of the intermediate sheet 40 is the first fiber layer 41, and the density of the first fiber layer 41 and the density of the second fiber layer 42 are 19,000 to 60,000 g / m². 3 Preferably, the apparent thickness (maximum) of the second fiber layer 42 is 0.2 to 0.8 mm, and the apparent thickness (maximum) of the surface layer is 0.9 to 1.1 times the apparent thickness of the second fiber layer 42.

[0046] The crimp count of the long fibers in the second fiber layer 42 can be determined as appropriate, but it is preferably 5 to 45 fibers / 2.54 cm (1 inch). Furthermore, the lower limit of the crimp count of the long fibers in the second fiber layer 42 is more preferably 10 fibers / 2.54 cm (1 inch), and particularly more preferably 20 fibers / 2.54 cm (1 inch). The crimp count of the long fibers in the first fiber layer 41 can be determined as appropriate, as long as it is less than the crimp count of the long fibers in the second fiber layer 42, for example, it can be 0 to 0.8 times, 0 to 0.7 times, 0 to 0.6 times, 0 to 0.5 times, 0 to 0.4 times, 0 to 0.3 times, 0 to 0.2 times, or 0 to 0.1 times the crimp count of the second fiber layer 42. Furthermore, the statement that the number of crimps of the long fibers in the first fiber layer 41 is less than the number of crimps of the long fibers in the second fiber layer 42 includes the case where the number of crimps of the long fibers in the first fiber layer 41 is 0 per 2.54 cm (1 inch), i.e., non-crimped fibers.

[0047] The apparent thickness of the second fiber layer 42 is more preferably 0.2 to 0.7 mm. Furthermore, it is preferable from the viewpoint of preventing backflow if the apparent thickness of the second fiber layer 42 is thinner than the apparent thickness of the surface layer, and from the viewpoint of diffusion if it is greater than or equal to the apparent thickness of the surface layer. If there is a first fiber layer 41 in addition to the surface layer, the apparent thickness of the first fiber layer 41 can be similarly determined.

[0048] The density of the second fiber layer 42 is 19,000 to 59,000 g / m². 3 Preferably, it is 19,000 to 38,000 g / m². 3 It is more preferable that the surface layer density be 20,000 to 60,000 g / m². 3 Preferably, it is 20,000 to 40,000 g / m². 3 It is more preferable that the density of the second fiber layer 42 is lower than the density of the surface layer (for example, 0.9 times or more and less than 1 time, particularly 0.95 times or more and less than 1 time), which is preferable from the viewpoint of improving the absorption rate, and is higher than or equal to the density of the surface layer (for example, 1 to 1.1 times, particularly 1 to 1.05 times), which is preferable from the viewpoint of diffusivity and prevention of backflow. If there is a first fiber layer 41 in addition to the surface layer, the density of the first fiber layer 41 can be similar.

[0049] The basis weight of the intermediate sheet 40 can be determined as appropriate, for example, 15-40 g / m². 2 Preferably, it is 17-35 g / m 2 It is more preferable that the fineness of the long fibers of the first fiber layer 41 and the long fibers of the second fiber layer 42 is 2.0 dtex.

[0050] In such an intermediate sheet 40, although both the first fiber layer 41 and the second fiber layer 42 are long fiber layers, they have sufficiently low density, resulting in excellent liquid permeability for the intermediate sheet 40 as a whole. Here, the first fiber layer 41 has fewer crimps than the second fiber layer 42, so it has lower liquid retention and higher directional dependence of diffusion (tendency to diffuse in the direction of fiber orientation). On the other hand, the second fiber layer 42, located behind the surface layer, has not only more crimps than the first fiber layer 41 but also sufficient thickness, so it has higher liquid retention and lower directional dependence of diffusion compared to the first fiber layer 41. Therefore, the entire intermediate seat 40 is, (a) By having a first fiber layer 41 and a second fiber layer 42 with sufficiently low density, the decrease in absorption rate is suppressed, (b) By including a second fiber layer with low directional dependence of diffusion, the diffuseness is improved, and further (c) Because the first fiber layer 41, which has relatively low liquid retention properties, forms the surface layer, even if the second fiber layer 42 has relatively high liquid retention properties, backflow is less likely. As a result, especially when the excrement is watery or soft, the liquid can be transferred to the absorbent material 56 more quickly and in greater quantities, with less backflow. Furthermore, since the intermediate sheet 40 is a long-fiber nonwoven fabric, it has the advantage of superior strength compared to a short-fiber nonwoven fabric. Additionally, because the intermediate sheet 40 is located between the top sheet 30 and the absorbent material 56, if the absorbent material 56 contains superabsorbent polymer particles, the superabsorbent polymer that escapes from the absorbent material 56 remains in the second fiber layer 42, which has a high crimp count, making it less likely to escape to the first fiber layer 41 and the surface of the top sheet 30.

[0051] As long as the surface layer is a first fiber layer 41 and there is at least one second fiber layer 42 on the back side of it, the number and arrangement of the first fiber layer 41 and the second fiber layer 42 can be determined as appropriate. A simple and preferred layer configuration is one in which all layers on the front side of any interlayer boundary in the thickness direction are first fiber layers 41, and all layers on the back side are second fiber layers 42. The simplest configuration is a two-layer structure, as shown in Figure 12(a), consisting of a surface layer made of first fiber layers 41 and a back layer made of second fiber layers 42. Based on this, in order to secure the thickness of at least one layer or the overall thickness, a group of first fiber layers 41, formed by directly laminating multiple first fiber layers 41, can be arranged on the front side of the intermediate sheet 40, or a group of second fiber layers 42, formed by directly laminating multiple second fiber layers 42, can be arranged on the back side of the intermediate sheet 40, as shown in Figure 12(b). As shown in Figure 12(c), the first fiber layer 41 or a group thereof and the second fiber layer 42 or a group thereof can also be stacked alternately in an even number of layers of four or more. In this way, the back layer of the intermediate sheet 40 is preferably the second fiber layer 42, but it can also be the first fiber layer 41. For example, as shown in Figure 12(d), the first fiber layer 41 or a group thereof and the second fiber layer 42 or a group thereof can also be stacked alternately in an odd number of layers of three or more.

[0052] When the back layer of the intermediate sheet 40 is the second fiber layer 42, it is preferable that the strike-through time with the surface of the intermediate sheet 40 facing upwards is 0.9 to 1.8 seconds, particularly 0.9 to 1.2 seconds, and shorter than the strike-through time with the back surface of the intermediate sheet 40 facing upwards (for example, about 0.8 to 0.9 times shorter). It is preferable that the strike-through time with the back surface of the intermediate sheet 40 facing upwards is 1.0 to 2.0 seconds, particularly 1.0 to 1.3 seconds. Furthermore, it is preferable that the liquid flow in the front-to-back direction LD on the surface of the intermediate sheet 40 is 30 to 45 cm, particularly 35 to 42 cm, and the liquid flow in the width direction WD on the surface of the intermediate sheet 40 is 20 to 40 cm. It is preferable that the backflow with the surface of the intermediate sheet 40 facing upwards is 0.05 to 0.1 g, and less than the backflow with the back surface of the intermediate sheet 40 facing upwards (for example, about 0.8 to 0.9 times shorter).

[0053] The crimp may be planar or three-dimensional, but three-dimensional crimp is preferred, and spiral crimp is particularly preferred, although wavy crimp is also acceptable, and multiple types of crimp may be mixed within the same layer. In long-fiber nonwovens, known methods can be used without particular limitation for crimping the fibers. For example, crimp can be induced by spinning and cooling irregularly shaped cross-section fibers. Furthermore, crimp can also be induced in composite fibers made of two or more thermoplastic resins. In this case, it is preferable to use a side-by-side or eccentric core-sheath structure for the composite fiber, as this allows for the induced three-dimensional crimp, primarily spiral crimp. In the case of an eccentric core-sheath structure, the core's center may be offset from the sheath's center, and in this case, the core may be exposed on the outer surface of the fiber. The proportion of the core's exposed area on the outer surface of the fiber can be 0-50%, and is particularly preferable to be 0-30%. In the side-by-side type, the composite ratio of the two components may be 1:1, or one component may be present in a larger proportion than the other. Furthermore, in the side-by-side type, the interface between the two components in the fiber cross-section may be linear or non-linear, such as curved.

[0054] When producing long fibers with crimp by combining two or more types of thermoplastic resins, the types of thermoplastic resins are not particularly limited as long as crimp is produced. However, when the fibers are bonded together by melt bonding of the fiber surfaces, it is preferable to combine thermoplastic resins with different melting points, and in particular from the viewpoint of the texture of the nonwoven fabric, it is preferable to combine polyolefin resins with each other, or polyolefin resins with polyester resins. An example of the former is a composite fiber made of multiple thermoplastic resins selected from resins such as polyethylene, polypropylene, and copolymers of their monomers with other α-olefins. Among these, from the viewpoint of strength, processability, and texture, it is preferable to use an eccentric core-sheath type composite fiber with a polypropylene core and a polyethylene sheath, or a side-by-side type composite fiber made of polypropylene and polyethylene as the crimped fibers of the second fiber layer 42. As the non-crimped or low-crimped fibers of the first fiber layer 41, composite fibers made of the same thermoplastic resins as the second fiber layer 42 can be suitably used.

[0055] Hydrophilic laminated nonwoven fabrics can be made hydrophilic by adding a hydrophilizing agent internally (adding to the fiber raw material) or externally (coating) if the fiber raw material is hydrophobic. Such hydrophilizing agents can be any known substance without particular limitation. For example, surfactants composed of a single agent or mixture of higher alcohols, higher fatty acids, nonionic surfactants such as alkylphenols with added ethylene oxide, or anionic surfactants such as alkyl phosphate salts and alkyl sulfates can be used.

[0056] The long fibers (filaments) constituting the first fiber layer 41 and the second fiber layer 42 are fibers that are continuous in the MD direction of the nonwoven fabric and can be manufactured by the spunbond method or the melt-blown method. Furthermore, the method of bonding the fibers is not particularly limited, and known chemical bonding, known mechanical bonding, and known thermal bonding can be selected. As for thermal bonding, point bonding, which is performed by heat-pressing in a pattern using an embossing roll, and hot air bonding, which is performed by passing through hot air to melt and bond the intersections of the fibers, can be suitably used. In particular, from the viewpoint of preventing the fibers of the fiber layer from becoming too dense, it is preferable to form a web using the spunbond method with thermoplastic resin as the raw material for both the first fiber layer 41 and the second fiber layer 42, and to bond the fibers by hot air bonding without pressure without using a heat calender.

[0057] The long fibers of the first fiber layer 41 and the long fibers of the second fiber layer 42 may have different thicknesses, but it is preferable that they have approximately the same thickness (for example, the fineness of the long fibers of the first fiber layer 41 is 0.9 to 1.1 times that of the long fibers of the second fiber layer 42), as this results in excellent overall integrity and texture of the intermediate sheet 40 while possessing the aforementioned performance.

[0058] In particular, when absorbing the liquid portion of loose stools, if the reduction in absorption rate is suppressed while improving backflow prevention and diffusion, the top sheet 30 is a perforated nonwoven fabric with a pore area of ​​1.0 to 10.0 mm². 2Preferably, the area ratio of the holes 31 in the top sheet 30 is 5 to 50%.

[0059] In the illustrated example, the intermediate sheet 40 is shorter than the width of the absorbent material 56 and is positioned in the center, but it may also be provided across the entire width. Furthermore, the intermediate sheet 40 may be provided across the entire length of the diaper, or it may be provided only in the intermediate portion including the excretion area, as shown in the illustrated example.

[0060] In wearable items such as diapers and sanitary napkins, stretchable areas are often provided that contract in their natural length state together with an elastic member, as in the waist stretchable area 79 described later, or the widthwise stretchable area WD provided around the waist of pant-type disposable wearable items (not shown). These areas are often pressed against the body surface by the contractile force of the elastic member in the stretchable area to enhance adhesion. However, such areas tend to wrinkle and retain moisture easily. On the other hand, the second fiber layer of the intermediate sheet 40 has high liquid retention properties, so even though it has a surface layer made of the first fiber layer, there is a risk of leakage in areas prone to wrinkles. Therefore, in wearable items equipped with such stretchable areas, it is preferable that the area containing the intermediate sheet 40 does not have an area where adhesion to the wearer is enhanced by the contractile force of the elastic member.

[0061] (Liquid-impermeable sheet) A liquid-impermeable sheet 11 can be provided on the back side of the absorbent. The liquid-impermeable sheet 11 is not particularly limited, but one that is permeable to moisture is preferred. As the liquid-impermeable sheet 11, for example, a microporous sheet obtained by kneading an inorganic filler into a polyolefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching it in a uniaxial or biaxial direction can be suitably used. Alternatively, a liquid-impermeable sheet 11 with enhanced waterproofing using a nonwoven fabric as the base material can also be used. When it is necessary to enable absorption from both the front and back sides of the product, a liquid-permeable sheet similar to the top sheet can be provided on the back side of the absorbent without providing the liquid-impermeable sheet 11, as needed.

[0062] It is desirable that the liquid-impermeable sheet 11 extends over the same or a wider area in the front-to-back direction LD and the width direction WD as the absorber 56, but if necessary, such as when other water-blocking means exist, the sheet may be constructed so as not to cover the edges of the absorber 56 in the front-to-back direction LD and the width direction WD.

[0063] (Outer nonwoven fabric) The outer nonwoven fabric 12 covers the entire back surface of the liquid-impermeable sheet 11, giving the product's outer surface a cloth-like appearance. The nonwoven fabric can be used as a single layer or in multiple layers. In the latter case, it is preferable to bond the nonwoven fabrics together with a hot-melt adhesive or the like. When using nonwoven fabric, the fineness of its constituent fibers should be 1.6 to 2.3 dtex and the basis weight 15 to 25 g / m². 2 Preferably, the nonwoven fabric has a thickness of 0.3 to 0.8 mm. The outer nonwoven fabric 12 can be omitted, in which case the liquid-impermeable sheet 11 will constitute the outer surface of the product.

[0064] (Gathered up) In order to prevent excrement from moving laterally along the top sheet 30 and thus prevent so-called lateral leakage, it is preferable that rise-up gathers 60 that rise from the surface along the position where the excrement is blocked are provided on both sides of the surface in the width direction WD.

[0065] More specifically, the rising gather 60 has a base portion 65 fixed to the area including the side flap SF, a main portion 66 extending from the base portion 65 toward the center in the width direction WD, a front folded portion 67f and a rear folded portion 67b formed by fixing the front and rear ends of the main portion 66 in a folded state, and a rising portion 68 formed by leaving the portion between the front folded portion 67f and the rear folded portion 67b of the main portion 66 unfixed. Furthermore, a gathering elastic member 63 is attached to at least the tip of the rising portion 68.

[0066] Each part of the rise-up gather 60 in the illustrated example is formed by a gather sheet 62, and this gather sheet 62 is folded in half at the tip of the main part 66 (the end opposite to the base part 65), so that the area including the free part has a two-layer structure. The gather elastic member 63 is sandwiched between the layers of this two-layer structure. The gather elastic member 63 can be provided only in the rise-up part 68, but as in the illustrated example, it is preferable to fix it from the rear end of the front-folding part 67f to the front end of the rear-folding part 67b so that the contraction force of the gather elastic member 63 acts not only over the entire rise-up part 68 but also on the ends of the front-folding part 67f and the rear-folding part 67b.

[0067] The inner surface of the gathered sheet 62 has a joining start end in the width direction WD on the side of the top sheet 30, and the portion extending outward in the width direction from this joining start end is joined to the inner surface of each side flap SF, that is, in the illustrated example, to the side of the liquid-impermeable sheet 11 and to the side of the outer nonwoven fabric 12 located outside it in the width direction, using a hot melt adhesive or the like.

[0068] The portion of the rising gather 60 that is inward in the width direction from the starting end of the joint is fixed to the top sheet 30 at both ends in the front-to-back direction, but the rising portion 68 in between is an unfixed, free portion. As a result, the rising portion 68 rises while contracting in the front-to-back direction due to the contractile force of the gathering elastic member 63, and at the same time becomes extendable in the front-to-back direction, so as to conform to the surface of the body. In addition, as the rising portion 68 contracts in the front-to-back direction due to the contractile force of the gathering elastic member 63, the portions having the front-folding portion 67f and the rear-folding portion 67b deform so that they move closer to each other.

[0069] Although not shown in the diagram, as is well known, the main part 66 of the rising gather 60 can also be folded in half, with a base end portion extending inward from the outer portion in the width direction and a tip end portion extending outward from the central edge of the base end portion in the width direction towards the body, and the front and rear ends of the main part 66 fixed to form a front folded portion 67f and a rear folded portion 67b.

[0070] The type of gathered sheet 62 is not particularly limited, but in most cases, a water-repellent material is used to ensure liquid barrier properties. In particular, nonwoven fabrics having meltblown layers between spunbond layers (SMS nonwoven fabric, SMMS nonwoven fabric, SSMS nonwoven fabric, SSMMS nonwoven fabric) are preferred because they can balance both a pleasant feel and liquid barrier properties. The nonwoven fabric can be used as a single sheet or in multiple layers. In the latter case, it is preferable to bond the nonwoven fabrics together with a hot melt adhesive or the like.

[0071] As the gathered elastic member 63, a rubber thread (spandex rubber thread with a thickness of approximately 420 to 1120 dtex) can be used. As shown in Figures 1 and 2, multiple gathered elastic members 63 can be provided on each side, or only one can be provided on each side. The elongation rate of the gathered elastic member 63 in the unfolded state can be determined as appropriate, but for example, it can be set to approximately 230 to 270%.

[0072] (Side flaps) The illustrated tape-type disposable diaper has a pair of side flaps SF that do not have the absorbent material 56, each extending laterally beyond the side edges of the absorbent material 56. The side flaps SF may be made of a material continuous with the portion having the absorbent material 56 (such as the outer nonwoven fabric 12), as shown in the illustrated example, or they may be formed by attaching other materials.

[0073] (Flat gathering) Each side flap SF has a side elastic member 64, made of an elongated elastic material such as elastic thread, fixed to it in an extended state along the front-to-back direction LD, thereby forming a flat gather around the leg portion of each side flap SF. As shown in the illustrated example, the side elastic member 64 can be provided between the gather sheet 62 and the liquid-impermeable sheet 11 at the widthwise outer side near the starting end of the joint portion of the gather sheet 62, or it can be provided between the liquid-impermeable sheet 11 and the outer nonwoven fabric 12 in the side flap SF. As shown in the illustrated example, multiple side elastic members 64 can be provided on each side, or only one can be provided on each side.

[0074] The flat gather is the part where the contraction force of the side elastic member 64 acts (in the figure, the part where the side elastic member 64 is shown). Therefore, in addition to the form in which the side elastic member 64 exists only in the flat gather area, there is also a structure in which the side elastic member 64 exists in front of the flat gather, behind it, or on both sides thereof, but the side elastic member 64 is cut into many small pieces in places other than the flat gather area, or is not fixed to the sheet sandwiching the side elastic member 64, or both, so that the contraction force does not act on the parts other than the flat gather (essentially equivalent to not providing an elastic member), and the contraction force of the side elastic member 64 acts only on the flat gather area.

[0075] (Wing section) In this tape-type disposable diaper, the dorsal portion B has a wing portion WP that extends outward in the width direction WD from the crotch portion M. Similarly, the ventral portion F also has a wing portion WP that extends outward in the width direction WD from the crotch portion M. These wing portions WP can also be formed from a different material from the other parts. However, in a structure having a side flap SF as shown in the illustrated example, it is preferable, because it simplifies manufacturing, to form a concave edge from the side edge of the crotch portion M to the lower edge of the wing portion by cutting the side of the side flap SF midway in the anterior-posterior direction LD, thereby forming the wing portion WP.

[0076] (Connecting tape) As shown in Figures 1, 2, and 5, the wing portion WP of the dorsal portion B is provided with connecting tapes 13 that are detachably connected to the outer surface of the ventral portion F. When putting on the diaper, the connecting tapes 13 are wrapped around the outer surface of the ventral portion F from both sides of the waist, and the connecting portion 13A of the connecting tapes 13 is connected to the appropriate place on the outer surface of the ventral portion F.

[0077] As shown in Figure 5, the connecting tape 13 has a base end portion 13C fixed to the wing portion WP, a sheet base material 13S that forms the main body portion 13B extending from the base end portion 13C, and a connecting portion 13A for the ventral portion F, provided in the middle of the width direction WD of the main body portion 13B on the sheet base material 13S. On the main body portion 13B, the part on the base end portion 13C side of the connecting portion 13A is an unconnected portion that is not connected to the ventral portion F, and the opposite side is a gripping portion. These unconnected portion and gripping portion consist only of the sheet base material 13S that forms the main body portion 13B.

[0078] The connecting portion 13A consists of the hook material (male part) of a mechanical fastener (hook-and-loop fastener). The hook material has numerous engaging protrusions on its connecting surface, and the shapes of the engaging protrusions include (A) L-shape, (B) J-shape, (C) mushroom-shaped, (D) T-shape, (E) double J-shape (a shape in which two J-shaped parts are joined back to back), but any shape is acceptable.

[0079] Furthermore, the sheet substrate 13S forming the base portion 13C to the main body portion 13B can be a nonwoven fabric, plastic film, poly-laminated nonwoven fabric, paper, or a composite material thereof.

[0080] In the illustrated example, the connecting portion 13A is provided on the sheet base material 13S of the connecting tape 13 that protrudes from the wing portion WP, but it may also be provided directly on the wing portion WP.

[0081] (Target Sheet) It is preferable that a target sheet 12T is provided at the connection point of the connecting tape 13 in the ventral portion F to facilitate the connection of the connecting tape 13.

[0082] The material of the target sheet 12T is not particularly limited, but if the connecting portion 13A is a hook material, a long-fiber nonwoven fabric in which the fibers are partially welded to each other by ultrasonic welding in an intermittent pattern can be used. In this case, the long-fiber nonwoven fabric has a fineness of 5 to 10 dtex and a basis weight of 25 to 40 g / m². 2Preferably, the nonwoven fabric has a thickness of 0.3 to 0.8 mm.

[0083] Furthermore, if the connecting portion 13A is a hook material, the target sheet 12T can be made of a base material made of plastic film or nonwoven fabric with numerous loop threads on its surface that allow the engaging protrusions of the hook material to entangle. A specific example of this is a composite sheet material in which loop pile fiber threads are sewn into at least the outer surface of the base material. In this sheet material, loop pile fiber threads are sewn weftly onto the outer surface of the base material, i.e., the outer surface of the disposable diaper. Economics The pile fibers are interwoven on the reverse side of the base material (the side facing the wearer), and the pile fibers are spaced apart in the direction of protrusion. Economics This is a formation of rows of intersecting threads.

[0084] Furthermore, if the connecting portion 13A is a hook material, and the connection point of the connecting tape 13 in the ventral portion F is made of nonwoven fabric (for example, if there is an outer nonwoven fabric 12 as shown in the illustrated example), a target sheet 12T made of plastic sheet, paper, nonwoven fabric, etc., on which the connection position such as a scale is printed can be placed inside the outer nonwoven fabric 12. In this case, the user can connect the parts by entangling the hook material of the connecting portion 13A with the fibers of the outer nonwoven fabric 12 at the position of the target sheet 12T, which is visible through the outer nonwoven fabric 12.

[0085] On the other hand, if the connecting portion 13A is an adhesive layer, the target sheet 12T can be a plastic film with a smooth surface that is highly adhesive, which has been subjected to a release treatment.

[0086] (End flap) This tape-type disposable diaper has a pair of end flaps EF that extend from the front and rear sides of the absorbent core 56, respectively, and do not have an absorbent core 56. The composition of the end flaps EF varies depending on the structure of the diaper. For example, the end flaps EF can be formed from the top sheet 30, intermediate sheet 40, packaging sheet 58, gather sheet 62, liquid-impermeable sheet 11, and outer nonwoven fabric 12, which are laminated and joined together, extending from the front and rear sides of the absorbent core 56. In cases where the intermediate sheet 40 and outer nonwoven fabric 12 are not provided, as in the illustrated example, the end flaps EF are formed from the top sheet 30 and liquid-impermeable sheet 11. Alternatively, a dedicated sheet for forming the end flaps EF may be added to the front or rear side of the absorbent core 56 to form the end flaps EF.

[0087] The front-to-back dimension LD of the end flap EF in the dorsal portion B is preferably longer than the front-to-back dimension LD of the base end 13C of the connecting tape 13. In most cases, the front-to-back dimension LD of the end flap EF is preferably about 20-25% of the front-to-back dimension L of the entire diaper, and for infant diapers, it is appropriate to set it to about 80-120 mm.

[0088] (Waist elasticity area) As shown in Figures 7 to 9, a waist elastic member 71 is fixed to the end flap EF, and it is preferable that the portion having the waist elastic member 71 is contractible in the width direction WD and has a waist stretchable region 79 that can be stretched in the width direction WD. The portion having the waist elastic member 71 may be entirely a waist stretchable region 79, or only a part of it may be a waist stretchable region 79. That is, the stretchability of a part of the waist elastic member 71 may be suppressed by a known method such as cutting. The waist stretchable region 79 is the region that circumscribes the portion of the waist elastic member 71 in which the stretchability has not been suppressed.

[0089] The waist elastic member 71 is not particularly limited as long as it is made of a material that is elastic and stretchable on its own. For example, in addition to elongated elastic materials such as threads or strings (for example, spandex thread rubber with a thickness of about 420 to 1120 dtex), mesh-like, perforated or non-perforated film-like elastic materials, stretchable nonwoven fabrics, etc. can be used as appropriate.

[0090] The fixing structure of the waist elastic member 71 to the end flap EF is not particularly limited. For example, the waist elastic member 71 can be directly fixed between the members constituting the end flap EF (e.g., the top sheet 30 and the liquid-impermeable sheet 11). Alternatively, as shown in the illustrated example, the expandable sheet 70 to which the waist elastic member 71 is fixed can be attached to the end flap EF. In this case, at least the portion of the expandable sheet 70 that becomes the waist expansion region 79 is joined intermittently or continuously to adjacent members in the thickness direction using a hot-melt adhesive or the like.

[0091] As the expandable sheet 70, for example, as shown in the figure, a sheet 73 of nonwoven fabric or the like can be folded in half or two sheets can be laminated to form a two-layer structure, and multiple elongated elastic members 71 and 72 can be attached between the layers at intervals in the front-to-back direction LD and stretched in the width direction WD. In this case, approximately 5 to 15 elastic members 71 and 72 can be provided at intervals d1 of 3 to 10 mm in the front-to-back direction LD. Furthermore, the elongation rate of the elastic members in the unfolded state can be approximately 180 to 220%.

[0092] The upper and lower layers of the stretchable sheet 70, as well as the elastic members 71 and 72, can be joined by known methods such as hot melt adhesive, heat sealing, ultrasonic sealing, or other welding methods.

[0093] The stretchable sheet 70 can be sandwiched between appropriate members between the top sheet 30 and the outer nonwoven fabric 12, as shown in the examples in Figures 7 to 9(a) (in the illustrated example, it is sandwiched between the top sheet 30 and the liquid-impermeable sheet 11, but it may also be sandwiched between the liquid-impermeable sheet 11 and the outer nonwoven fabric 12). In addition, although not shown, it can also be attached as the uppermost layer located on the skin side. In the latter case, in the part with the gathered sheet 62, the stretchable sheet 70 is placed above the gathered sheet 62 (i.e., the entire thing becomes the uppermost layer), or it can be placed between the top sheet 30 and the gathered sheet 62.

[0094] (e.g., the relationship between the waist elastic area and the absorbent material) As shown in an enlarged view in Figure 8, the waist expansion region 79 is preferably formed between at least the left and right rearward-folding portions 67b of the end flap EF, and the front edge of the waist expansion region 79 and the rear edge of the absorber 56 are spaced apart in the front-rear direction LD, and the front edge of the rearward-folding portion 67b and the rear edge of the absorber 56 are spaced apart in the front-rear direction LD.

[0095] In this case, the contraction force of the elastic gathering member 63 of the rising gather 60 acts to raise the region between the front edge of the rear-folded portion 67b and the rear edge of the absorbent 56 (hereinafter also referred to as the rising region 20), starting from the rear edge of the absorbent 56, as shown in Figure 9(b). This is because the portion containing the absorbent 56 has relatively high rigidity, while the rigidity decreases behind the rear edge of the absorbent 56. Furthermore, in this case, the waist elastic region 79 is pressed against the wearer's skin by contraction in the width direction WD. Therefore, in this connected disposable wearable item, as shown in Figures 10 and 11, the rising region 20 rises, and the portion behind it is pressed against the wearer's skin. As a result, the rear edge of the absorbent 56 and its vicinity are recessed over almost the entire width of the absorbent 56, and a deep and wide storage space 21 (pocket) is firmly formed. Moreover, since this storage space 21 is formed by a combination of the arrangement of the waist elastic region 79 and the arrangement of the rearward-folding portion 67b of the rising gather 60, the structure is very simple. Furthermore, on the waist side of the recess that becomes the storage space 21, the rising region 20 rises up, and the portion further back is pressed against the wearer's skin, thus providing a high level of effectiveness in preventing the movement of the excretory organs backward, and also ensuring a good fit to the wearer's body surface.

[0096] If the front edge of the rear-folded portion 67b is located in front of the front edge of the waist elasticity region 79, the rear-folded portion 67b, which does not fit well to the skin, will extend in front of the front edge of the waist elasticity region 79 that is pressed against the skin, which may cause leakage through the rear-folded portion 67b. Therefore, as shown in the illustrated example, it is preferable that the front edge of the rear-folded portion 67b is located at the same position as or behind the front edge of the waist elasticity region 79. As a result, the rear-folded portion 67b, which does not fit well to the skin, is not located in front of the front edge of the waist elasticity region 79 that is pressed against the skin, and the rising portion 68, which fits well to the skin, is located there. Therefore, as the rising region 20 rises, the rising portions 68 of the rising gathers 60 rise from both sides thereafter, resulting in superior leak prevention.

[0097] The distance 20d in the longitudinal direction LD between the position of the leading edge of the rear-tilted portion 67b and the position of the trailing edge of the absorber 56 (equal to the dimension of the longitudinal direction LD of the upright region 20) affects the depth of the storage space 21 that is formed, and can therefore be determined appropriately depending on the product. For example, under normal circumstances, this distance 20d can be 10 to 40 mm, and especially 20 to 30 mm.

[0098] The position of the longitudinal LD ​​at the front edge of the waist stretch region 79 can be determined as appropriate, but in most cases, the distance between the front edge of the waist stretch region 79 and the rear edge of the absorber 56 in the longitudinal direction is preferably 0.2 to 0.5 times the dimension of the longitudinal LD ​​of the end flap EF. Also, the distance 79a between the front edge of the waist stretch region 79 and the front edge of the rearward-folding portion 67b can be determined as appropriate, but is preferably about 0 to 15 mm.

[0099] The waist elasticity region 79 may be provided only in a portion between the rearward-folding portions 67b on both the left and right sides of the end flap EF, as long as it is formed between at least the rearward-folding portions 67b on both sides. However, as shown in the illustrated example, if the waist elasticity region 79 extends to at least the rearward-folding portions 67b on both the left and right sides, the portion located between the left and right rising gathers 60 behind the rising region 20 will be firmly pressed against the wearer's skin over the entire width direction WD. Therefore, it is preferable as it provides better leak prevention. From a similar viewpoint, it is preferable that the distance 79b between the rear edge of the waist elasticity region 79 and the rear edge of the end flap EF in the front-rear direction LD is 17 mm or less.

[0100] The gathered elastic member 63 does not necessarily have to be located on the absorber 56 when unfolded, but it is preferable that the gathered elastic member 63 attached to at least the tip of the rising portion 68 is located on the absorber 56, as this allows the contraction force of the gathered elastic member 63 of the rising gather 60 to act more directly on the rising region 20, making it easier for the rising region 20 to rise starting from the trailing edge of the absorber 56.

[0101] <Effectiveness Confirmation Test> Using intermediate sheets No. 1 to 3 shown in Table 1, diaper samples No. 1 to 4 shown in Table 2 were prepared, and the following measurements were taken for each sample: soft stool absorption rate, diffusion distance, backflow amount, and product liquid flow. The structure of all diaper samples was the same as that shown in Figures 1 to 11. Except for the specifications shown in Tables 1 and 2, all other specifications were common to all samples. In Table 1, "strike-through 1 to 3" refers to the measured values ​​obtained when the sample was set in the lister and the strike-through was measured three times at 30-second intervals.

[0102] [Table 1] [Table 2]

[0103] (Stool absorption rate) (1) A test apparatus was prepared using a fluid delivery tube and a fluid delivery pump (product name Masterflex, manufactured by Cole-Parmer) to draw up simulated soft stool from a beaker and discharge it from the tip of the fluid delivery tube. (2) The sample was placed on a flat plate that was set horizontally with the top sheet facing upwards, and the four corners of the sample were secured to the flat plate with adhesive tape while it was unfolded. (3) A mark was placed at the center in the width direction and 130 mm from the rear end of the product, and the tip of the liquid delivery tube was set 10 mm above that mark with the tip pointing downwards. (4) 400g of yogurt (Meiji Bulgaria Yogurt LB81 Plain), 600g of deionized water, and approximately 5g of Kiriya's Food Blue No. 1 (Brilliant Blue FCF) (packaging: powder) were placed in a beaker and stirred for 1 hour at a rotation speed of 600 R.PM using a magnetic stirrer to prepare a simulated soft stool. (5) The liquid delivery pump was operated to dispense 10 ml of simulated soft stool onto the sample at a flow rate of 120 ml / min. The absorption time (in seconds) from the start of dispensing until all of the simulated soft stool was absorbed (completely removed) from the surface of the sample was measured using a stopwatch and defined as the absorption rate.

[0104] (Amount of reverse flow) (6) The weight (g) of the number of sheets of ADVANTEC's qualitative filter paper No. 2 (100mm x 100mm square) used was measured to three decimal places using an electronic balance. (7) Three minutes after the measurement of the absorption rate described above was completed, ten sheets of filter paper were placed in the same orientation on top of each other at the site of the simulated soft stool discharge, and a 1 kg weight was placed on top of them and left unattended. The weight had a flat base with a square shape measuring 100 mm in length and 100 mm in width. The filter paper and weight were placed on the sample surface so that their length and width directions were aligned with the front-to-back and width directions of the sample, and so that the centers of the filter paper and weight were located at the site of the simulated soft stool discharge. If it was not possible to cover the sample with a set of ten sheets of filter paper, two or more sets of filter paper and weight were used to cover the entire diffusion area of ​​the simulated soft stool and apply a load over the entire area. (8) After placing the weight described in (7) above, the entire filter paper was removed after 1 minute and its weight (g) was measured to two decimal places. The amount of backflow was obtained by subtracting the weight described in (6) above from this weight after absorption.

[0105] (Diffusion distance) (9) Immediately after measuring the amount of backflow as described in (8) above, the maximum dimensions in the anterior-posterior direction and the maximum dimensions in the width direction of the diffusion area of ​​the pseudo-soft stool (blue area) were measured using a ruler and defined as the diffusion distances in the anterior-posterior direction and the width direction, respectively.

[0106] (Product liquid flow) (1) The sample was placed on a 15-degree inclined plate such that the front-to-back direction was the inclined direction (the width direction was the same as the height) and the ventral side was at a higher position, and the four corners of the sample were fixed to the inclined plate with adhesive tape while it was unfolded. (2) A mark was placed 50 mm from the front of the product, and 5 cc of simulated soft stool was dripped from a height of 10 mm above the mark at a rate of 7 cc / second. (3) After performing the above (2) four times at 10-minute intervals, the maximum distance the liquid flowed from the marked position downwards in the direction of the slope (towards the rear of the product) was measured with a ruler and defined as the product liquid flow.

[0107] The test results are shown in Table 2. Compared to Sample 2, Sample 1 showed improved soft stool absorption rate, significantly reduced backflow, a ratio of diffusion distance in the anterior-posterior direction to diffusion distance in the lateral direction approaching 1:1, and a shorter product liquid flow. Figure 14(a) is a surface photograph of Sample 1 during diffusion distance measurement, and Figure 14(b) is a surface photograph of Sample 2 during diffusion distance measurement; the darkest colored area represents the diffusion range containing solids, and the lightly colored ring surrounding it represents the diffusion range containing only liquids. Similarly, compared to Sample 4, Sample 3 showed improved soft stool absorption rate, significantly reduced backflow, a ratio of diffusion distance in the anterior-posterior direction to diffusion distance in the lateral direction approaching 1:1, and a shorter product liquid flow. In particular, Sample 3 showed a faster soft stool absorption rate than Sample 1.

[0108] <Explanation of terms used in the specification> The following terms in this specification shall have the meanings set forth below, unless otherwise specified in this specification.

[0109] "Front-to-back direction" refers to the direction indicated by the symbol LD in the diagram (vertical direction), and "width direction" refers to the direction indicated by WD in the diagram (left-to-right direction). The front-to-back direction and the width direction are orthogonal to each other.

[0110] • "MD direction" and "CD direction" refer to the flow direction (MD direction) and the transverse direction (CD direction) perpendicular to it in the manufacturing equipment. Depending on the part of the product, one of these directions may be the front-to-back direction and the other the width direction. The MD direction of nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. Fiber orientation is the direction along which the fibers of the nonwoven fabric run. For example, it can be determined by a measurement method compliant with the fiber orientation test method by zero-distance tensile strength of the TAPPI standard method T481, or by a simple measurement method that determines the fiber orientation direction from the ratio of tensile strength in the front-to-back and width directions.

[0111] "Front side" refers to the side that is closer to the wearer's skin when worn, while "back side" refers to the side that is further away from the wearer's skin when worn.

[0112] "Surface" refers to the side of the material that is closer to the wearer's skin when worn, while "back" refers to the side of the material that is further away from the wearer's skin when worn.

[0113] • "Elongation rate" refers to the value relative to the natural length, which is set at 100%. For example, an elongation rate of 200% is equivalent to an elongation ratio of 2.

[0114] "Artificial urine" is a mixture of urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and deionized water: 97.09 wt%.

[0115] The "gel strength" is measured as follows: 1.0 g of superabsorbent polymer is added to 49.0 g of artificial urine and stirred with a stirrer. The resulting gel is left in a constant temperature and humidity chamber at 40°C and 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured using a card meter (I.techno Engineering: Curdmeter-MAX ME-500).

[0116] The "average fiber diameter" is determined by observing the target layer at a magnification of 1000x using a microscope (optical microscope or SEM, etc.), randomly selecting 30 constituent fibers, measuring their fiber diameter (μm), and calculating the average value.

[0117] "Weight" is measured as follows: After pre-drying the sample or test piece, leave it in a test room or apparatus under standard conditions (temperature 23±1°C, relative humidity 50±2%) to reach a constant weight. Pre-drying means bringing the sample or test piece to a constant weight in an environment of 100°C. Note that pre-drying is not necessary for fibers with an official moisture content of 0.0%. Using a sample-taking template (100mm x 100mm), cut out a sample measuring 100mm x 100mm from the test piece that has reached a constant weight. Measure the weight of the sample, multiply it by 100 to calculate the weight per square meter, and this is the weight.

[0118] • "Thickness," "Compressive Stiffness LC," "Compressive Energy WC," and "Recovery RC" were measured using an automatic thickness measuring instrument (KES-G5 compression tester) at a compression speed of 20 μm / sec and a pressurized area of ​​2 cm². 2 Automatic measurement is performed under these conditions. Note that when simply referring to thickness, the pressure is 0.0049 N / cm². 2 ( 0.0049N / cm 2 ) refers to the thickness To, where Tm is the pressure 0.49 N / cm². 2 ( 0.49N / cm 2 This refers to the thickness at the point of manufacture. The thickness of perforated nonwoven fabrics, etc., is measured in the area excluding the holes and the protruding parts around them.

[0119] The "apparent thickness" of the layers of the laminated nonwoven fabric is measured by the following method: A measurement piece measuring 30 mm in the front-to-back direction (MD direction) x 30 mm in the width direction (CD direction) is cut from the nonwoven fabric in question. An enlarged photograph of the cross-section along the MD direction is taken using a digital microscope such as the Keyence VHX-1000. Based on this enlarged photograph, the thickness of the target layer is measured at five points per image, and the average value is taken as the apparent thickness of the target layer.

[0120] • The "strike-through" time for nonwoven fabrics refers to the time (in seconds) required for a specified amount of saline solution to pass from the front to the back of the nonwoven fabric, measured according to EDANA (European Disposables And Nonwovens Association)-ERT §150.4-99 LIQUID STRIKE-THROUGH TIME. The absorbent pad uses six layers of filter paper (INTEC, GRADE: 989, LF: 3.52g). Furthermore, the strike-through time with the front side up refers to the value measured with the front side of the product facing upwards, and the strike-through time with the back side up refers to the value measured with the back side of the product facing upwards.

[0121] The "liquid flow" of nonwoven fabric is measured using the following procedure. (1) Cut out a test piece measuring 100 mm in the front-to-back direction and 100 mm in the width direction. Place this test piece on top of three stacked sheets of ADVANTEC's qualitative filter paper No. 2 (100 mm x 100 mm square), and fix it on a 45-degree inclined plate so that the front-to-back direction is the inclined direction (the width direction is the same as the height). At this time, the front-to-back direction and width direction of the test piece should be aligned with the length direction and width direction of the filter paper. Furthermore, liquid flow on the surface refers to the value measured with the side that is located on the front side of the product facing upwards, and liquid flow on the back side refers to the value measured with the side that is located on the back side of the product facing upwards. (2) Mark a point 20 mm from the top of the test specimen, and drop 1 cc of artificial urine from a height of 10 mm above the mark using a glass pipette. (3) Measure the maximum distance the liquid flows downward in the direction of the slope from the marked position using a ruler, rounding the measured value to one decimal place, and determine the liquid flow.

[0122] • The "wetback" of the nonwoven fabric refers to the weight (g) of the wetbacked saline solution, measured following the aforementioned strike-through measurement, in accordance with EDANA (European Disposables And Nonwovens Association)-ERT §151.2-99 Nonwoven Coverstock Wetback. The absorbent material used is six layers of filter paper (INTEC, GRADE: 989, LF: 3.52g), and the pickup paper used is Hollingsworth & Vose's Analytical & Industrial Filter Paper (ERT MWWS SHEETS).

[0123] • "Water absorption capacity" is measured according to JIS K7223-1996 "Test method for water absorption capacity of superabsorbent polymers".

[0124] • The "water absorption rate" shall be the "time to the endpoint" when 2 g of superabsorbent polymer and 50 g of physiological saline solution are used in the JIS K7224-1996 "Test method for water absorption rate of superabsorbent polymers".

[0125] The "fiber orientation" of a nonwoven fabric refers to the direction in which the fibers of the nonwoven fabric run. This can be determined, for example, by a measurement method conforming to the fiber orientation test method using zero-distance tensile strength of the TAPPI standard method T481, or by a simple measurement method that determines the fiber orientation direction from the ratio of tensile strength in the front-to-back and width directions.

[0126] "Deployed state" refers to a state in which the body is unfolded flat without any contraction (including contraction due to elastic members, etc.) or slack.

[0127] Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not the natural length state.

[0128] Unless otherwise specified, the tests and measurements shall be conducted in a test room or apparatus under standard conditions (temperature 23±1°C, relative humidity 50±2%). [Industrial applicability]

[0129] The present invention Absorbent items such as disposable diapers, sanitary napkins, and pet sheets. This is applicable. [Explanation of Symbols]

[0130] B...dorsal portion, EF...end flap, F...ventral portion, LD...front-to-back direction, SF...side flap, WD...width direction, WP...wing portion, 11...liquid impermeable sheet, 12...outer nonwoven fabric, 12T...target sheet, 13...connecting tape, 13A...connecting part, 13B...main body part, 13C...base end, 20...rising area, 21...storage space, 30...top sheet, 40...intermediate sheet, 50...absorbent element, 56...absorbent body, 58...packaging sheet, 60...rising gather, 62...gather sheet, 63...gather elastic member, 65...base part, 66...main part, 67b...rear folding part, 67f...forward folding part, 68...rising part, 70...stretchable sheet, 71...waist elastic member, 79...waist stretch area, 41...first fiber layer, 42...second fiber layer.

Claims

1. It has a liquid-permeable top sheet, an absorbent positioned behind the top sheet, and an intermediate sheet interposed between the top sheet and the absorbent. The aforementioned intermediate sheet is a hydrophilic laminated nonwoven fabric consisting of multiple long fiber layers. The plurality of long fiber layers include at least one first fiber layer consisting of crimped or non-crimped long fibers with a fineness of 1.5 to 6.0 dtex, and at least one second fiber layer consisting of crimped long fibers with a fineness of 1.5 to 6.0 dtex. The number of crimps of the fibers in the first fiber layer is less than the number of crimps of the fibers in the second fiber layer. The surface layer forming the surface of the intermediate sheet is the first fiber layer, The density of the first fiber layer and the density of the second fiber layer are 19,000 to 60,000 g / m³. ３ And, The apparent thickness of the second fiber layer is 0.2 to 0.8 mm, and the apparent thickness of the surface layer is 0.9 to 1.1 times the apparent thickness of the second fiber layer. An absorbent article characterized by the following features.

2. The aforementioned intermediate sheet has a back layer that forms the back surface, which is a second fiber layer. The strike-through time with the surface of the intermediate sheet facing upwards is 0.9 to 1.8 seconds for the first time, and is shorter than the strike-through time with the underside of the intermediate sheet facing upwards. The liquid flow in the front-to-back direction on the surface of the intermediate sheet is 30 to 45 cm. The liquid flow in the width direction on the surface of the intermediate sheet is 20 to 40 cm. The reverse flow with the surface of the intermediate sheet facing upwards is 0.05 to 0.1 g, and is less than the reverse flow with the back surface of the intermediate sheet facing upwards. The absorbent article according to claim 1.

3. The aforementioned hydrophilic laminated nonwoven fabric is formed by bonding composite fibers together by hot air bonding without using a heat calender. The fineness of the long fibers in the first fiber layer is 0.9 to 1.1 times that of the long fibers in the second fiber layer. The second fiber layer consists of eccentric core-sheath type or side-by-side composite fibers. The absorbent article according to claim 1 or 2.

4. The aforementioned top sheet is a perforated nonwoven fabric in which holes penetrating from the front to the back are provided at predetermined intervals in a specific pattern. The area of ​​the hole is 1.0 to 10.0 mm². ２ The area ratio of holes in the top sheet is 5 to 50%. The absorbent article according to claim 1 or 2.

5. A wearable article having an elastic member that is contracted in its natural length state and has an expandable and expandable region, The region having the top sheet and the absorbent, and having a region that is pressed against the wearer by the contraction force of the elastic member, The region having the aforementioned intermediate sheet, and which does not have a region that is pressed against the wearer by the contraction force of the elastic member, The absorbent article according to claim 1 or 2.

Images