Body fluid absorbent pad

Abstract

To provide a body fluid absorbent pad having improved feeling of use.SOLUTION: A body fluid absorbent pad comprises a top sheet, a back sheet, an absorption sheet, and a bulky sheet. The top sheet extends in a length direction and a width direction and is brought into contact with a user's skin. The back sheet is disposed opposite the top sheet. The absorption sheet is disposed between the top sheet and the back sheet and includes an absorbent polymer. The bulky sheet is disposed between the top sheet and the absorption sheet. The contour of the top sheet has a front end part and a rear end part disposed separated in the length direction and an intermediate part, the minimum length of the intermediate part in the width direction is 60 nm or longer. The thickness of the bulky sheet is 1.2 mm or more but less than 2 mm, and the basis weight of the absorption sheet is 130 g / m2 or more and 170 g / m2 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a body fluid absorbent pad. [Background technology]

[0002] Patent Document 1 discloses a bodily fluid absorbent pad for absorbing bodily fluids such as vaginal discharge, menstrual blood, sweat, and urine. The bodily fluid absorbent pad disclosed in Patent Document 1 includes a top sheet forming a surface layer that contacts the wearer's skin when worn, a back sheet forming a back layer, and an absorbent body disposed between the top sheet and the back sheet. According to Patent Document 1, the absorbent body can be made of absorbent pulp, absorbent polymer, fiber structure, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-089424 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, while the water-absorbent polymer has a high liquid-absorbing capacity, it takes a relatively long time to absorb liquid. Therefore, when the water-absorbent polymer or an absorbent body containing the same is placed under the top sheet, the water-absorbent polymer may not be able to absorb all the body fluids at once, and the body fluids may overflow onto the surface of the top sheet. As a result, the wearer may feel wet or feel uncomfortable with the appearance of the top sheet, which may lead to a deterioration in the feeling of use. However, simply increasing the basis weight of the absorbent body may cause a stiff feeling or discomfort when worn, which may deteriorate the feeling of use of the body fluid absorbent pad. [Means for solving the problem]

[0005] The bodily fluid absorbent pad according to a first aspect of the present invention comprises a top sheet, a back sheet, an absorbent sheet, and a bulky sheet. The top sheet extends in a longitudinal direction and a width direction perpendicular to the longitudinal direction, and contacts the skin of a user. The back sheet is disposed opposite the top sheet. The absorbent sheet is disposed between the top sheet and the back sheet, and contains an absorbent polymer. The bulky sheet is disposed between the top sheet and the absorbent sheet. The top sheet and the back sheet have an outer shape with a front end and a rear end that are disposed apart in the longitudinal direction, and an intermediate portion between the front end and the rear end, the minimum length in the width direction of the intermediate portion being 60 mm or more, the thickness of the bulky sheet being 1.2 mm or more and less than 2 mm, and the basis weight of the absorbent sheet being 130 g / m 2 More than 170g / m 2 The following is the result.

[0006] A bodily fluid absorbent pad according to a second aspect is the bodily fluid absorbent pad according to the first aspect, wherein the outer shape of the absorbent sheet is smaller than the outer shape of the bulky sheet.

[0007] A bodily fluid absorbent pad according to a third aspect is the bodily fluid absorbent pad according to the first or second aspect, wherein the porosity of the bulky sheet is 94% or more.

[0008] A bodily fluid absorbent pad according to a fourth aspect is a bodily fluid absorbent pad according to any one of the first to third aspects, wherein the ratio of the basis weight of the absorbent polymer to the basis weight of the absorbent sheet is 35% or more and 50% or less.

[0009] A bodily fluid absorbent pad according to a fifth aspect is the bodily fluid absorbent pad according to any one of the first to fourth aspects, wherein the maximum length in the longitudinal direction of the top sheet and the back sheet is 160 mm or more. Effect of the Invention

[0010] According to the present invention, it is possible to provide a body fluid absorbent pad with improved usability. [Brief description of the drawings]

[0011] [Figure 1] 1 is a plan view of a bodily fluid absorbent pad according to an embodiment of the present invention; [Diagram 2] Bottom view of Figure 1. [Diagram 3] Cross-sectional view taken along line AA in Figure 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] <1. Overview of body fluid absorption pads> An embodiment of the body fluid absorbent pad 1 according to the present invention will be described below with reference to the drawings. Fig. 1 is a plan view of the body fluid absorbent pad 1 according to this embodiment, Fig. 2 is a bottom view of Fig. 1, and Fig. 3 is a cross-sectional view taken along line AA in Fig. 1. However, the drawings do not necessarily reflect the actual dimensions.

[0013] The body fluid absorbent pad 1 is attached to underwear or the like during use to absorb body fluids such as vaginal discharge, menstrual blood, sweat, and urine. The body fluid absorbent pad 1 comprises a top sheet 2, a bulky sheet 3, an absorbent sheet 4, and a back sheet 5, which are layered in this order. An adhesive layer 6 is formed on the back surface of the back sheet 5 for attaching the body fluid absorbent pad 1 to the underwear. In addition, a pressure-bonding portion 7 is formed along the periphery of the body fluid absorbent pad 1. In this embodiment, the layered sheets are integrated together by an adhesive such as a hot melt.

[0014] The top sheet 2 and the back sheet 5 are disposed opposite to each other, and their outer shapes form the outer shape of the bodily fluid absorbent pad 1. The outer shape of the bodily fluid absorbent pad 1 according to this embodiment has a shape symmetrical from front to back in the longitudinal direction and a shape symmetrical from left to right in the width direction, but is not particularly limited thereto. The bulky sheet 3 according to this embodiment is also formed in the same shape as the top sheet 2 and the back sheet 5. The bodily fluid absorbent pad 1 is formed in a vertically elongated shape to fit the crotch area of ​​the user. That is, the bodily fluid absorbent pad is formed so as to extend in a longitudinal direction extending in the front-rear direction of the user's body and in a width direction perpendicular to the longitudinal direction in a plan view. The following description will be given based on the directions and orientations shown in FIG. Each member will be described in detail below.

[0015] <2. Top sheet> The top sheet 2 is the portion that comes into contact with the skin of the user when the bodily fluid absorbent pad 1 is in use. The outer shape of the top sheet 2 has a front end 20 and a rear end 21 that are spaced apart in the longitudinal direction, and an intermediate portion 22 therebetween. The front end 20 and the rear end 21 according to this embodiment are formed in arc shapes that protrude forward and backward, and each continues to the intermediate portion 22 at a point where its widthwise length is maximum. The intermediate portion 22 according to this embodiment has an outer shape whose widthwise length decreases from both longitudinal ends to the center, and whose widthwise length is smallest at the longitudinal center.

[0016] Hereinafter, the maximum length in the longitudinal direction of the top sheet 2 is designated as L1, the minimum length in the width direction of the intermediate portion 22 is designated as W1, and the maximum length in the width direction of the top sheet 2 is designated as W2. Note that the maximum length L1 can also be said to be the maximum length in the longitudinal direction of the bodily fluid absorbent pad 1, and the maximum length W2 can also be said to be the maximum width of the bodily fluid absorbent pad 1. Also, the minimum length W1 of the intermediate portion 22 can also be said to be the minimum width of the central portion of the bodily fluid absorbent pad 1 in the longitudinal direction.

[0017] In this embodiment, the length L1 is preferably 160 mm or more, more preferably 165 mm or more and 185 mm or less, and even more preferably 168 mm or more and 180 mm or less. The length W1 is preferably 60 mm or more, more preferably 61 mm or more and 70 mm or less, and even more preferably 61 mm or more and 65 mm or less. If the length L1 and the length W1 are equal to or greater than the lower limit, more of the user's private parts can be covered, and leakage can be prevented. In addition, even if the position where the underwear is attached is shifted, the underwear is covered over a wider range, so that it is not necessary to reattach it to adjust the position. On the other hand, if the length W1 is equal to or less than the upper limit, twisting due to the movement of the user's legs is less likely to occur.

[0018] When in use, the entire body fluid absorbent pad 1 corresponds to the private parts of the user when attached to the underwear. In particular, the vicinity of the center in the longitudinal direction is placed near the center in the front-to-rear direction of the crotch of the underwear. By having the length W1 of the body fluid absorbent pad 1 be equal to or greater than the above-mentioned lower limit, the pad is of an appropriate size to fit the width of the crotch.

[0019] The top sheet 2 is in direct contact with the crotch area of ​​the user during use, and is liquid permeable so as to allow bodily fluids such as vaginal discharge, menstrual blood, sweat, and urine to pass through and penetrate into the underlying bulky sheet 3 and absorbent sheet 4. The material constituting the top sheet 2 is not particularly limited, and examples thereof include natural fibers such as cotton, silk, pulp, wool, and hemp; synthetic fibers such as polyester fibers, ethylene vinyl acetate fibers, polyvinyl alcohol fibers, polyamide fibers, acrylic fibers, polypropylene fibers, polyethylene fibers, polyethylene / polyester composite fibers, and polyethylene / polypropylene composite fibers; semi-synthetic fibers such as rayon fibers, acetate fibers, and cupra; and fibers made by mixing various fibers (cotton blends and fiber blends). These materials may be used alone or in combination of two or more types.

[0020] The sheet structure of the top sheet 2 is not particularly limited, and examples thereof include woven fabrics, knitted fabrics, nonwoven fabrics, and felts. Nonwoven fabrics are preferred in terms of good texture, skin irritation, and absorbency. The method of manufacturing the nonwoven fabric used for the top sheet 2 is not particularly limited, and it can be manufactured by a method such as a wet papermaking method, a dry papermaking method, a spunbond method, a meltblowing method, a latex resin bond method, a solvent bond method, a stitch bond method, a needle punch method, a spunlace method, a thermal bond method, an air-through method, or an airlaid method. The top sheet 2 according to this embodiment is composed of a spunlace nonwoven fabric manufactured by a spunlace method in order to improve the texture. The top sheet 2 may have a porous structure such as a mesh structure in order to increase liquid permeability.

[0021] The top sheet 2 can be constructed using the various materials and sheet structures described above, but it is preferable to use natural fibers (especially cotton) in order to ensure a good feel against the skin when used. When natural fibers are used for the top sheet 2, bodily fluids are more likely to migrate to the bulky sheet and accumulate on the surface of the top sheet 2 compared to when the top sheet 2 contains synthetic fibers, and the wet feeling felt by the user can be reduced.

[0022] <3. Bulky sheet> The bulky sheet 3 is a sheet disposed between the top sheet 2 and the absorbent sheet 4, and has a lower density and higher compression recovery than the other sheets contained in the bodily fluid absorbent pad 1. The bulky sheet 3 according to this embodiment is formed in the same shape as the top sheet 2, and is compressed together with the top sheet 2 and the back sheet 5 by the compression section 7.

[0023] The material constituting the bulky sheet 3 is not particularly limited, but examples thereof include natural fibers such as cotton, silk, pulp, wool, and hemp; synthetic fibers such as polyester fibers, polyvinyl alcohol fibers, ethylene vinyl acetate fibers, polyamide fibers, acrylic fibers, polypropylene fibers, polyethylene fibers, urethane fibers, polyethylene / polyester composite fibers, and polyethylene / polypropylene composite fibers; semi-synthetic fibers such as rayon fibers, acetate fibers, and cupra; fibers mixed with various fibers; and resin foams such as urethane sponge. These may be used alone or in combination of two or more types. The bulky sheet 3 according to this embodiment is made of synthetic fibers of PET and PET / PE (a core-sheath structure in which the core is PET and the sheath is PE).

[0024] The sheet structure of the bulky sheet 3 is not particularly limited as long as it has many voids and high compression recovery, and examples thereof include woven fabrics, knitted fabrics, nonwoven fabrics, felts, and foams. The method of manufacturing the nonwoven fabric used for the bulky sheet 3 is not particularly limited, and the sheet can be manufactured by a wet papermaking method, a dry papermaking method, a spunbond method, a meltblowing method, a latex resin bond method, a solvent bond method, a stitch bond method, a needle punch method, a spunlace method, a thermal bond method, an air-through method, an airlaid method, or the like. The bulky sheet 3 according to this embodiment is composed of an air-through nonwoven fabric manufactured by the air-through method.

[0025] The thickness of the bulky sheet 3 is preferably 1.2 mm or more and less than 2 mm. By setting the thickness of the bulky sheet 3 within the above range, the bodily fluid absorbent pad 1 can be made to feel soft against the skin of the user, while the timing at which the bodily fluid reaches the absorbent sheet 4 can be appropriately adjusted.

[0026] In addition, the porosity of the bulky sheet 3 is preferably 94% or more. The porosity of the bulky sheet 3 is measured by calculating the volume fraction of voids (areas where no fibers exist) from an image captured by a CT scan. The spatial resolution of the CT scan is 2 μm, and the field of view is 3 mm × 3 mm. When the porosity of the bulky sheet 3 is equal to or greater than the lower limit, the body fluid that passes through the top sheet 2 is quickly captured in the voids of the bulky sheet 3 and temporarily stored in the bulky sheet 3. This makes it possible to slow down the speed at which the body fluid reaches the absorbent sheet 4, compared to when the absorbent sheet 4 is disposed directly under the top sheet 2. In other words, the body fluid is prevented from overflowing onto the top sheet 2 due to inability of the absorbent sheet 4 to absorb it, and the wet feeling felt by the user is reduced. In addition, the deterioration of the appearance caused by the overflowed body fluid spreading over the surface of the top sheet 2 is prevented.

[0027] The weight of the bulky sheet 3 is 35 g / m 2 It is preferable that the thickness is 40 g / m or more. 2 More preferably, it is 45 g / m or more. 2 More preferably, it is equal to or greater than this.

[0028] <4. Absorbent sheet> The absorbent sheet 4 is disposed between the top sheet 2 and the back sheet 5, directly below the bulky sheet 3, and inside the compression section 7 in a plan view. That is, the outer shape of the absorbent sheet 4 is smaller than that of the bulky sheet 3. The outer shape of the absorbent sheet 4 may be rectangular or may be an approximation of the outer shape of the bulky sheet 3 obtained by reducing it, and is not particularly limited. The absorbent sheet 4 according to this embodiment has a substantially rectangular outer shape, with the front end and rear end formed in an arc shape protruding forward and backward.

[0029] If the maximum length in the longitudinal direction of the absorbent sheet 4 is L2, then length L2 is preferably 125 mm to 150 mm, more preferably 128 mm to 145 mm, and even more preferably 130 mm to 140 mm. If the maximum length in the width direction of the absorbent sheet 4 is W3, then length W3 is preferably 36 mm to 50 mm, more preferably 38 mm to 48 mm, and even more preferably 40 mm to 46 mm.

[0030] The absorbent sheet 4 is a sheet for absorbing and retaining body fluids, and contains super absorbent polymer (SAP). The absorbent sheet 4 according to this embodiment is composed of a sheet, also called an SAP sheet, in which granular SAP is dispersed in a nonwoven fabric. The material constituting the nonwoven fabric is not particularly limited, and examples thereof include natural fibers such as cotton, silk, pulp, wool, and hemp; synthetic fibers such as polyester fibers, polyvinyl alcohol fibers, ethylene vinyl acetate fibers, polyamide fibers, acrylic fibers, polypropylene fibers, polyethylene fibers, urethane fibers, polyethylene / polyester composite fibers, and polyethylene / polypropylene composite fibers; or semi-synthetic fibers such as rayon fibers, acetate fibers, and cupra; and fibers in which various fibers are mixed. These may be used alone or in combination of two or more types. In the absorbent sheet 4 according to this embodiment, a combination of pulp fibers and composite fibers is used.

[0031] The nonwoven fabric can be manufactured by a method such as a wet papermaking method, a dry papermaking method, a spunbond method, a meltblowing method, a latex resin bond method, a solvent bond method, a stitch bond method, a needle punch method, a spunlace method, a thermal bond method, an air-through method, an airlaid method, etc. The nonwoven fabric of the absorbent sheet 4 according to this embodiment is an airlaid nonwoven fabric manufactured by the airlaid method.

[0032] The basis weight of the absorbent sheet 4 is 130 g / m 2 More than 170g / m 2 It is preferable that the thickness is less than 140 g / m 2 More than 160g / m 2 It is more preferable that the ratio of the basis weight of SAP to the basis weight of the entire absorbent sheet 4 is 35% or more and 50% or less.

[0033] <5. Back sheet> The back sheet 5 is a liquid-impermeable sheet (including a film) that prevents the outflow of bodily fluids absorbed in the absorbent sheet 4 to the outside. Examples of materials constituting the back sheet 5 include films made of polyethylene, polypropylene, polyester, nylon, polyvinyl alcohol, cellophane, vinyl chloride, etc., or multi-layer films of these materials. Note that the back sheet 5 may be made of a liquid-impermeable and breathable material, and may be a liquid-impermeable nonwoven fabric such as SMS, or a spunbond nonwoven fabric or point-bond nonwoven fabric laminated with a resin film.

[0034] <6. Adhesive layer> The adhesive layer 6 is a layer for attaching the bodily fluid absorbent pad 1 to underwear. As shown in FIG. 2, the adhesive layer 6 is formed by applying an adhesive to the rear surface of the back sheet 5. The adhesive used in the adhesive layer 6 is not particularly limited as long as it can attach the bodily fluid absorbent pad 1 to underwear, and examples of the adhesive include water-soluble adhesives (e.g., acrylic water-soluble adhesives) and water-insoluble adhesives (e.g., rubber-based hot melt, olefin-based hot melt). Among them, water-insoluble adhesives are preferred because they have superior adhesive strength to underwear compared to other adhesives, and rubber-based hot melts are more preferred.

[0035] The adhesive layer 6 is composed of a plurality of strip-shaped adhesive portions 60 (only representative ones are labeled with reference numerals) extending in the width direction inside the pressure-bonding portion 7. The adhesive portions 60 according to this embodiment are arranged at predetermined intervals in the longitudinal direction. However, the configuration of the adhesive layer 6 is not particularly limited, and may be composed of, for example, strip-shaped adhesive portions extending in the longitudinal direction inside the pressure-bonding portion 7 and arranged at predetermined intervals in the width direction. The adhesive layer 6 may also be composed of a single adhesive portion 60.

[0036] Before use (before being attached to underwear), the bodily fluid absorbent pad 1 is folded with the adhesive layer 6 on the outside, and is entirely covered with a release sheet (not shown) that protects the adhesive layer 6 and can be peeled off from the adhesive layer 6 when in use. This release sheet is formed by applying a release agent to a sheet material such as a plastic film, a fiber sheet, or paper, and the release agent side is attached to the adhesive layer 6.

[0037] <7. Crimping section> The pressure-bonding portion 7 is formed by thermocompression processing along the outer periphery of the body fluid absorbent pad 1. The pressure-bonding portion 7 is formed by melt-bonding the top sheet 2, the bulky sheet 3, and the back sheet 5. The pressure-bonding portion 7 is preferably formed at a position slightly inside the outer periphery of the body fluid absorbent pad 1. More specifically, the outer periphery of the pressure-bonding portion 7 is preferably disposed 1 mm or more and 10 mm or less inside from the outer periphery of the body fluid absorbent pad 1. The pressure-bonding portion 7 is preferably formed in a line or band shape, and its width is preferably 1 mm or more and 10 mm or less. The width of the pressure-bonding portion 7 may be constant or may vary depending on the position of the body fluid absorbent pad 1. The pressure-bonding portion 7 according to this embodiment is formed so as to be widest at the positions corresponding to the front and rear ends of the body fluid absorbent pad 1 and narrowest at the center of the body fluid absorbent pad 1 in the longitudinal direction.

[0038] <8.Features> According to the body fluid absorbent pad 1 of this embodiment, the following effects can be obtained. (1) In the body fluid absorbent pad 1, a top sheet 2, a bulky sheet 3, and an absorbent sheet 4 are arranged in this order. Body fluid that passes through the top sheet 2 is temporarily stored in the bulky sheet 3 and gradually reaches the absorbent sheet 4. By making the thickness of the bulky sheet 3 1.2 mm or more, the speed at which the body fluid passes through can be appropriately adjusted to match the absorption speed of the absorbent sheet 4, and the feel can be made soft. In other words, even without making the basis weight of the absorbent sheet 4 larger than necessary or making the outer dimensions of the absorbent sheet 4 larger than necessary, the absorption by the absorbent sheet 4 is prevented from overflowing into the top sheet 2, and the wet feeling (cold feeling) felt by the user is reduced. Note that the absorbent sheet 4 containing SAP is relatively hard, and if the basis weight or area is increased, the feeling of stiffness increases, leading to a deterioration in the feel of the body fluid absorbent pad 1 when used. In this regard, in the body fluid absorbent pad 1, the bulky sheet 3 is disposed next to the top sheet 2, and the absorbent sheet 4 is formed smaller than the bulky sheet 3, thereby improving the absorption performance without compromising the softness of the bulky sheet 3. In addition, deterioration of the appearance caused by overflowing body fluids spreading over the surface of the top sheet 2 is suppressed, improving the overall feel when used. The porosity of the bulky sheet 3 is 94% or more, which makes the improvement in feel when used even more remarkable.

[0039] (2) By setting the ratio of the basis weight of the SAP to the basis weight of the entire absorbent sheet 4 to 35% or more and 50% or less, it is possible to reduce the discomfort felt by the user due to swelling of the SAP.

[0040] (3) The bodily fluid absorbent pad 1 has a maximum length L1 in the longitudinal direction of 160 mm or more, and a minimum length W1 in the width direction of the intermediate portion 22 of 60 mm or more. As a result, particularly when the bodily fluid absorbent pad 1 is configured as a vaginal discharge absorbent pad, the area capable of absorbing bodily fluids is larger than that of conventional vaginal discharge absorbent pads. Therefore, more bodily fluids can be absorbed and leakage can be prevented. In addition, the adhesive layer 6 can be formed over a wider area, which prevents the pad from slipping out of the underwear, thereby preventing leakage. Furthermore, since the minimum length W1 in the width direction is longer than in the conventional pads, even if the bodily fluid absorbent pad 1 is slightly shifted in the width direction, the pad can still cover the private parts, thereby preventing leakage.

[0041] (4) Since the minimum width W1 of the intermediate portion 22 is longer than that of the conventional pad, the adhesive portion 60 can be made longer in the width direction, which prevents the pad from slipping from the crotch. Meanwhile, since the adhesive portions 60 are arranged at predetermined intervals in the longitudinal direction, the bodily fluid absorbent pad 1 can be easily removed from the underwear.

[0042] (5) Because the top sheet 2 and the bulky sheet 3 are wide, they are easily compressed in the width direction during use, which makes it easier for folds to form, particularly on the surface inside the pressure-bonding portion 7. That is, folds that tend to collect bodily fluids can be formed on the upper side of the absorbent sheet 4, and bodily fluids can be guided more reliably to the absorbent sheet 4, further preventing leakage. In addition, the absorbent sheet 4 is formed smaller than the bulky sheet 3, particularly in the width direction. That is, since the absorbent sheet 4 itself is unlikely to protrude from the crotch, the user is unlikely to feel a hard sensation from the absorbent sheet 4 even if the bodily fluid absorbent pad 1 comes into contact with the skin of the legs.

[0043] <9. Variations> Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. The following modified examples can be combined as appropriate.

[0044] The body fluid absorbent pad 1 is required to have at least a top sheet 2, a bulky sheet 3, an absorbent sheet 4 and a back sheet 5, but each sheet may be made up of multiple layers.

[0045] The position of the pressure-bonding portion 7 is preferably slightly inside the outer periphery of the bodily fluid absorbent pad 1 as described above, but it can also be provided on the outer periphery. Also, the pressure-bonding portion 7 can be omitted and the sheets can be bonded together with an adhesive. Conversely, the sheets can be fixed together by the pressure-bonding portion 7 without using an adhesive.

[0046] In the above embodiment, the outer shape of the absorbent sheet 4 is smaller than that of the bulky sheet 3, but the outer shape of the absorbent sheet 4 may be the same as that of the top sheet 2 or the bulky sheet 3. In addition, the absorbent sheet 4 does not have to be disposed inside the compression-bonding portion 7. Furthermore, the SAP may be fibrous rather than granular.

[0047] In the above embodiment, the back sheet 5 is made of a material that is liquid-impermeable and breathable. However, the back sheet 5 may be made of a material that does not have breathability.

[0048] The bodily fluid absorbent pad 1 has an outer shape that is symmetrical in the longitudinal direction and symmetrical in the width direction, but the outer shape of the bodily fluid absorbent pad 1 is not limited to this. For example, the pad may have an asymmetrical shape in the longitudinal direction. Specifically, the rear end portion 21 may be formed wider than the front end portion 20. The outer shape of the top sheet 2 may be formed such that the widthwise length of the intermediate portion 22 is constant throughout the longitudinal direction. In this case, the minimum widthwise length W1 of the intermediate portion 22 coincides with the maximum width W2 of the front end portion 20 and the rear end portion 21. The outer shape of the absorbent sheet 4 is also not limited to that of the above embodiment. EXAMPLES

[0049] Examples of the present invention will be described below, but the present invention is not limited to the following examples.

[0050] <1. Preparation of Examples and Comparative Examples> The bodily fluid absorbent pads according to Examples 1 to 3 and the bodily fluid absorbent pads according to Comparative Examples 1 to 3 were prepared. The bodily fluid absorbent pads according to Examples 1 to 3 had the configuration of the above embodiment, and the thickness and porosity of the bulky sheet were different. The bodily fluid absorbent pad according to Comparative Example 1 had the same configuration as the bodily fluid absorbent pads according to Examples 1 to 3, except that it did not have a bulky sheet. The bodily fluid absorbent pad according to Comparative Example 2 had a top sheet, a bulky sheet, and an absorbent sheet, but the lengths L1 and W1 and the thickness of the bulky sheet were smaller than those of the above embodiment, and the proportion of SAP in the absorbent sheet was unknown (because it was a commercially available product). The bodily fluid absorbent pad according to Comparative Example 3 had lengths L1 and W1 and the thickness of the bulky sheet smaller than those of the above embodiment, and the proportion of SAP in the absorbent sheet was also smaller than those of the above embodiment. The back sheets were all made of polyethylene and had an adhesive layer. The configuration, lengths L1, L2, and W1 to W3 of each bodily fluid absorbent pad are shown in Table 1 below. [Table 1]

[0051] <2. Experiment> The following experiments were carried out on each of the body fluid absorbent pads according to Examples 1 to 3 and Comparative Examples 1 to 3.

[0052] <2-1.Saline absorption rate> The adhesive layer of the body fluid absorbent pad was attached to a flat surface, and 8 g of saline was dropped onto the center of the top sheet of the body fluid absorbent pad. The time (seconds) from the start of the drop to the end of the saline absorption by the body fluid absorbent pad was measured with a stopwatch.

[0053] <2-2. Cool sensation to the touch> The adhesive layer of the body fluid absorbent pad was attached to a flat surface, and 8 g of physiological saline was dropped onto the center of the top sheet of the body fluid absorbent pad. 2 ) was measured 5 minutes and 60 minutes after the application using a contact cooling sensation measuring device (Thermo Labo II, manufactured by Kato Tech Co., Ltd.).

[0054] <2-3. Maximum absorption amount> The adhesive layer of the body fluid absorbent pad was attached onto the filter paper, and liquid was dropped onto the center of the top sheet of the body fluid absorbent pad. One minute after dropping, a 0.5 mm thick polyvinyl chloride sheet (Unisand EB435-1, manufactured by Hikari Co., Ltd.) was placed on top of the body fluid absorbent sheet, and a 3.5 kg weight was placed on top of that. The weight had a square base of 10 cm x 10 cm. At this time, the load applied to the filter paper was 35 g / m 2 The body fluid absorbent pad was left in this state for one minute, after which it was confirmed whether the liquid had seeped into the filter paper, and the maximum amount of liquid that did not seep out was regarded as the maximum absorption amount. The experiment was carried out in two ways: with physiological saline and with a viscous liquid.

[0055] <2-4. Visual impression when absorbing liquid> Thirty people evaluated the appearance of a bodily fluid absorbent pad when 8g of saline solution dyed Blue No. 1 was dropped onto the center of the top sheet. If 20 or more people had the impression that the liquid did not spread much and that it was comfortable to wear, the pad was rated as "A (good appearance impression)," if 15 to 20 people had the impression that it was "B (slightly good appearance impression)," and if 14 or less people had the impression that it was "C (bad appearance impression)."

[0056] <2-5. Comfort when wearing> Thirty people actually wore each bodily fluid absorbent pad and rated how wet it felt when bodily fluids leaked out. If 20 or more people answered that they felt little wet even when bodily fluids leaked out and that the comfort (feel of the surface) was good, the pad was rated as "A (feeling not wet)," if 15 to 20 people answered that they felt good, they were rated as "B (feeling slightly wet)," and if 14 or less people answered that they felt good, they were rated as "C (feeling very wet)."

[0057] <3. Experimental Results> The results of the experiment are shown in Table 2 below. Comparing Examples 1 to 3 with Comparative Example 1, it can be seen that the liquid absorption speed, maximum absorption amount, and (low) cool feeling to the touch are significantly improved in Examples 1 to 3 by providing a bulky sheet. In addition, the results of the cool feeling to the touch tend to coincide with the evaluation of the visual impression and the comfort when worn, and it was confirmed that the actual feeling of use was improved in Examples 1 to 3. [Table 2] [Explanation of symbols]

[0058] 1 Fluid Absorbing Pad 2 Surface sheet 3. Bulky Sheet 4 Absorbent Sheets 5 Back Seat 6 Adhesive layer 7 Crimping section 20 Front end 21 Rear end 22 Middle section

Claims

1. A top sheet extending in a longitudinal direction and a width direction perpendicular to the longitudinal direction and in contact with the skin of a user; A back sheet disposed opposite the top sheet; an absorbent sheet disposed between the topsheet and the backsheet, the absorbent sheet comprising an absorbent polymer; a bulky sheet disposed between the top sheet and the absorbent sheet; Equipped with The outer shape of the top sheet and the back sheet has a front end and a rear end that are spaced apart in the longitudinal direction, and an intermediate portion between the front end and the rear end, and the minimum length in the width direction of the intermediate portion is 60 mm or more; The thickness of the bulky sheet is 1.2 mm or more and less than 2 mm, The basis weight of the absorbent sheet is 130 g / m 2 Above, 170g / m 2 Below is the Fluid absorbing pad.

2. The outer shape of the absorbent sheet is smaller than the outer shape of the bulky sheet.

2. The body fluid absorbent pad according to claim 1.

3. The porosity of the bulky sheet is 94% or more.

3. The body fluid absorbent pad according to claim 1 or 2.

4. The ratio of the basis weight of the absorbent polymer to the basis weight of the absorbent sheet is 35% or more and 50% or less.

3. The body fluid absorbent pad according to claim 1 or 2.

5. The maximum length of the top sheet and the back sheet in the longitudinal direction is 160 mm or more.

3. The body fluid absorbent pad according to claim 1 or 2.

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