Body fluid absorbent articles

Abstract

To provide a body fluid absorbent article for obtaining preferable use feeling while keeping high absorbency.SOLUTION: A body fluid absorbent article 1 includes a top sheet 2, a back sheet 3, and an absorber 4 arranged between the top sheet and the back sheet. The absorber 4 is an SAP sheet 40 including an absorbent polymer. The body fluid absorbent article 1 further includes a compression recovery sheet 5 arranged between the absorber 4 and the top sheet 2. A compression deformation rate T of the body fluid absorbent article 1 is 0.75 or more.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] Patent Document 1 describes a conventional body fluid absorbent article (body fluid absorbing pad in Patent Document 1). The body fluid absorbing pad described in Patent Document 1 includes a top sheet, a back sheet, and an absorbent disposed between the top sheet and the back sheet. The absorbent has a bodily fluid absorbency, and an absorbent with high body fluid absorbency, for example, is used as a SAP sheet containing a superabsorbent polymer (SAP). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-89424 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, since SAP sheets containing absorbent polymers are relatively hard, there is a problem that when a SAP sheet is layered on a top sheet, the contact area feels hard to the wearer of the body fluid absorbent article, resulting in an unpleasant feel when used.

[0005] The present invention has been made in view of the above circumstances, and has an object to provide a body fluid absorbent article which maintains high absorbency while providing a good feeling of use. [Means for solving the problem]

[0006] A bodily fluid absorbent article according to one aspect of the present invention is a bodily fluid absorbent article comprising a top sheet which is a surface layer that contacts the skin of a wearer, a back sheet which is a back layer, and an absorbent body disposed between the top sheet and the back sheet, the absorbent body being a SAP sheet containing an absorbent polymer, and a spunbonded layer between the absorbent body and the top sheet. In the absorbent body, The absorbent article further comprises a compression recovery sheet disposed thereon, and the compression deformation ratio of the absorbent article is 0.75 or more.

[0007] In the body fluid absorbent article according to the above aspect, the compression recovery sheet preferably has a compression resilience value of 6.5% or more.

[0008] In the body fluid absorbent article according to the above aspect, it is preferable that the compression recovery sheet is an air-through nonwoven fabric.

[0009] In the body fluid absorbent article according to the above aspect, it is preferable that all of the dimensions between the absorber and the outer periphery of the body fluid absorbent article are 20 mm or less.

[0010] In the above-mentioned aspect of the body fluid absorbent article, it is preferable that the slippage start angle of the body fluid absorbent article measured by a slippage start angle measuring method is 37° or more.

[0011] In the above-mentioned embodiment, the body fluid absorbent article preferably has an absorption capacity of 1.5 cc or more of physiological saline. Effect of the Invention

[0012] The bodily fluid absorbent article according to the above aspect of the present invention has an advantage in that it provides a good feeling of use while maintaining high absorbency. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a plan view of a body fluid absorbent article according to one embodiment of the present invention. [Diagram 2]FIG. 2 is a bottom view of the above body fluid absorbent article. [Diagram 3] FIG. 3 is a cross-sectional view taken along line X1-X1 of FIG. [Figure 4] FIG. 4 is an explanatory diagram of an SS curve used when calculating the compression resilience value. [Diagram 5] FIG. 5 is a schematic diagram of a slip start angle measurement device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] <Embodiment> (1) Overall The body fluid absorbent article 1 according to this embodiment will be described in detail below.

[0015] The body fluid absorbent article 1 according to this embodiment is attached to the wearer's clothing (e.g., underwear) or skin to absorb body fluids. Examples of body fluids include vaginal discharge, menstrual blood, sweat, and urine. Examples of the body fluid absorbent article 1 include a vaginal discharge sheet 10 (panty liner), sanitary napkin, incontinence pad, underarm sweat pad, sweat absorbing sheet, and the like. In this embodiment, as shown in FIG. 1, a vaginal discharge sheet 10 will be described as an example of the body fluid absorbent article 1. The body fluid absorbent article 1 includes a top sheet 2 that contacts the wearer's skin, a back sheet 3, an absorbent body 4, and a compression recovery sheet 5, which are laminated to form a multi-layer structure.

[0016] The bodily fluid absorbent article 1 is formed in a sheet shape. In this specification, one side of the bodily fluid absorbent article 1 that contacts the wearer's skin is defined as the "front side," and the other side is defined as the "back side." In the bodily fluid absorbent article 1, a top sheet 2, a compression recovery sheet 5, an absorbent body 4, and a back sheet 3 are laminated in this order from the front side to the back side in the thickness direction, as shown in Fig. 3.

[0017] As shown in FIG. 2, the body fluid absorbent article 1 according to this embodiment has an adhesive layer 6 provided on the back surface of the back sheet 3. The body fluid absorbent article 1 is attached to an undergarment by the adhesive layer 6 when worn. A pressure-bonded portion 11 is formed on the outer peripheral edge of the body fluid absorbent article 1 along the entire outer periphery. The pressure-bonded portion 11 presses the top sheet 2, the compression recovery sheet 5, and the back sheet 3 together. The thickness of the pressure-bonded portion 11 is thinner than the other portions. In this embodiment, the body fluid absorbent article 1 does not have the pressure-bonded portion 11 formed on any portion other than the outer peripheral edge.

[0018] In the body fluid absorbent article 1, all the dimensions between its outer periphery (i.e., the outer periphery of the pressure-bonding portion 11) and the absorbent 4 are set to 20 mm or less. The dimension between the outer periphery of the body fluid absorbent article 1 and the absorbent 4 means the dimension between the outer periphery of the body fluid absorbent article 1 and the absorbent 4 on the normal line of the outer periphery. Even the largest dimension between the outer periphery of the body fluid absorbent article 1 and the absorbent 4 is set to 20 mm or less, so that even if body fluid moves near the outer periphery, the absorbent 4 can absorb it, and the body fluid is unlikely to leak from the side and is unlikely to wrinkle. The outer periphery of the body fluid absorbent article 1 and the outer periphery of the absorbent 4 may coincide in a plan view, that is, the dimension between the outer periphery of the body fluid absorbent article 1 and the absorbent 4 may be 0 mm or more.

[0019] The initial thickness of the bodily fluid absorbent article 1 according to this embodiment is not particularly limited, but if the initial thickness is too thick, the user will feel uncomfortable due to stiffness, while if it is too thin, the resilience will be low and the article will be prone to twisting and slipping, making it difficult for the wearer to use it for long periods of time. Therefore, the initial thickness of the bodily fluid absorbent article 1 is preferably 0.5 mm or more and 7.5 mm or less. The "initial thickness" here refers to the thickness of the bodily fluid absorbent article 1 before it absorbs bodily fluids and in a state where no load is applied.

[0020] The amount of physiological saline absorbed by the body fluid absorbent article 1 is preferably 1.5 cc or more, more preferably 1.7 cc or more, and even more preferably 2 cc or more.

[0021] (2) Top sheet The top sheet 2 is a surface layer that comes into contact with the wearer's skin. The top sheet 2 is configured to allow bodily fluids to pass through in the thickness direction. Therefore, the top sheet 2 comes into contact with the wearer's skin, and when bodily fluids are discharged from the wearer, the bodily fluids pass through the top sheet 2 in the thickness direction and are transferred to the compression recovery sheet 5 and the absorbent body 4. In short, the top sheet 2 is liquid permeable.

[0022] The top sheet 2 is not particularly limited as long as it has liquid permeability, and examples thereof include woven fabrics, knitted fabrics, nonwoven fabrics, felts, etc., among which nonwoven fabrics are preferred from the viewpoints of pleasant touch, low irritation to the skin, and high absorbency. The nonwoven fabric constituting the top sheet 2 can be produced by, for example, 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 air-laid method, etc., among which, the spunlace method, the thermal bond method, the air-through method, the air-laid method, the needle punch method, and the spunbond method are preferred, and these methods have a good texture and do not use adhesives or solvents, so that safety to the skin can be increased. From the viewpoint of pleasant touch, nonwoven fabrics produced by the spunlace method (spunlace nonwoven fabrics) are preferred.

[0023] The material constituting the top sheet 2 is not particularly limited, and examples thereof include synthetic fibers such as polyester fibers, polyamide fibers, acrylic fibers, polypropylene fibers, polyethylene / polyester composite fibers, and polyethylene / polypropylene composite fibers; natural fibers such as cotton, silk, pulp, wool, and hemp; semi-synthetic fibers such as rayon fibers and acetate fibers; and fibers made by mixing various fibers (blended fibers, mixed fibers). Among these, natural fibers are preferred from the viewpoints of pleasant feel and low irritation to the skin, and cotton is particularly preferred. Furthermore, the top sheet 2 is not limited to being a single layer, and may be composed of a laminate consisting of multiple layers.

[0024] (3) Back sheet The back sheet 3 is a back surface layer, and prevents the body fluid absorbed by the absorbent 4 from penetrating to the back surface side. The back sheet 3 is liquid impermeable. There is no particular limitation on the back sheet 3 as long as it is liquid impermeable, and examples thereof include films, liquid impermeable nonwoven fabrics such as SMS, and sheets in which a resin film is laminated on spunbond nonwoven fabrics or point bond nonwoven fabrics. Examples of liquid impermeable films include films made of polyethylene, polypropylene, polyester, nylon, polyvinyl alcohol, cellophane, vinyl chloride, etc., or multilayer films thereof.

[0025] (4) Absorbent As shown in FIG. 3, the absorbent body 4 is disposed between the top sheet 2 and the back sheet 3, and absorbs and retains body fluids. The absorbent body 4 is a SAP sheet 40 containing a superabsorbent polymer (SAP). The SAP sheet 40 here refers to a sheet-like member containing SAP. The SAP sheet 40 according to this embodiment is made of a nonwoven fabric (for example, a nonwoven fabric produced by an airlaid method (i.e., an airlaid nonwoven fabric)) in which SAP is dispersed.

[0026] However, the SAP sheet may be configured in a sheet form by laminating a nonwoven fabric having SAP dispersed therein as an absorbent layer between a support sheet and a cover sheet. In this case, for example, the sheet may be configured as follows.

[0027] The support sheet is a sheet facing the back sheet 3, and supports the absorbent layer having SAP. The cover sheet is a sheet that covers the SAP sheet 40 from the front side, and has liquid permeability. Examples of the cover sheet include paper and tissue paper made of cellulosic fibers. Examples of the cellulosic fibers include wood pulp such as softwood or hardwood; recycled paper pulp; non-wood pulp such as hemp or cotton; chemically synthesized pulp; and cellulose fibers derived from cotton. Synthetic fibers such as polyester fibers, polyamide fibers, acrylic fibers, polypropylene fibers, polyethylene / polyester composite fibers, and polyethylene / polypropylene composite fibers may also be included. The cover sheet may be embossed.

[0028] The SAP sheet 40 may be rectangular in plan view, or may have a shape having an outer edge that follows the outer peripheral edges of the top sheet 2 and the back sheet 3. In this embodiment, the SAP sheet 40 has a shape having an outer edge that follows the outer peripheral edges of the top sheet 2 and the back sheet 3, and as described above in "(1) Overall configuration", the distance between the outer peripheral edge of the body fluid absorbent article 1 and the absorbent body 4 is set to 20 mm or less.

[0029] While the SAP sheet 40 has high absorbency, it is relatively hard and lacks flexibility. Therefore, the use of the SAP sheet 40 may impair the pleasant feel against the skin of the body fluid absorbent article 1. In this embodiment, however, a flexible compression recovery sheet 5 is disposed between the SAP sheet 40 (absorbent body 4) and the top sheet 2.

[0030] (5) Compression recovery sheet The compression recovery sheet 5 is a flexible sheet disposed between the absorbent body 4 and the top sheet 2. The compression recovery sheet 5 preferably has a compression resilience value (RC value) of 6.5% or more, more preferably 13% or more, and even more preferably 21% or more.

[0031] Here, the compression resilience value (RC value) is a value indicating compression recovery, and the closer the value is to 100%, the higher the compression recovery. The compression resilience value can be calculated using values ​​measured using a compression tester (KES-G5, manufactured by Kato Tech Co., Ltd.). The compression tester is used to measure the compression resilience under a load of 2000 g / cm. 2 The load (gf / cm) when compressing the compression recovery sheet 5 at a speed of 0.10 cm / sec and when the compression recovery sheet 5 recovers after the load is removed. 2 ) and the amount of pushing (mm) are measured. Then, the load (gf / cm 2 The relationship between the force applied when compressing (W2) and the amount of compression (mm) is displayed as an SS curve, and the ratio of the total force applied when recovering (W2) to the total force applied when compressing (W1) is calculated as a percentage, which is the compression resilience value.

[0032] Specifically, as shown in FIG. 4, the SS curve is plotted against the load (gf / cm) when the compression recovery sheet 5 is pressed against the vertical axis. 2 ), and the horizontal axis is the pressing distance (mm) which is the deformation amount of the compression recovery sheet 5. The total force W1 during compression is W1 = (area of ​​portion A1) + (area of ​​portion B1), and the total force W2 during recovery is W2 = (area of ​​portion B1), and the compression resilience value RC is calculated using the formula RC = (W2 / W1) x 100.

[0033] When the compression resilience value of the compression recovery sheet 5 is 6.5% or more, the body fluid absorbent article 1 has high compression recovery and can maintain contact with the wearer's skin at an appropriate pressure. By using the SAP sheet 40, even if the body fluid absorbent article 1 becomes somewhat hard, the feel against the skin can be improved.

[0034] Examples of the compression recovery sheet 5 include woven fabrics, knitted fabrics, nonwoven fabrics, fiber structures made of pulp products, and foams such as urethane sponges. Examples of the compression recovery sheet 5 include aggregates (e.g., nonwoven fabrics) made of natural or synthetic fibers, and examples of the natural fibers include cotton, silk, pulp, wool, and hemp. Examples of the synthetic fibers include nylon fibers, polyethylene fibers, polyester fibers, polyamide fibers, acrylic fibers, polyvinyl alcohol fibers, polypropylene fibers, polyethylene terephthalate fibers, ethylene vinyl acetate fibers, and urethane fibers. Semi-synthetic fibers such as rayon fibers, acetate fibers, and cupra fibers, as well as blends and mixed fibers of various fibers, may also be used. These may be used alone or in combination of two or more.

[0035] The nonwoven fabric can be produced by, for example, 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 air-laid method, etc. Among these, a nonwoven fabric produced by the air-through method (sometimes referred to as an air-through nonwoven fabric) is preferred from the viewpoint of having high flexibility.

[0036] The thickness of the compression recovery sheet 5 is preferably 2.0 mm or more and 7.3 mm or less, and more preferably 3.0 mm or more and 7.0 mm or less. The compression recovery sheet 5 is preferably weakly hydrophilic.

[0037] The compression recovery sheet 5 according to the present embodiment is an air-through nonwoven fabric made of synthetic fibers of PET and PET / PE (core:PET sheath:PE core-sheath structure). The basis weight of the compression recovery sheet 5 is 20 g / m 2 More preferably, it is 40 g / m or more. 2 More preferably, it is 60 g / m 2 The weight of the compression recovery sheet 5 is 20 g / m 2If the fabric is less than this, the wearer will not feel fluffy and it will be uncomfortable to the touch. 2 When the basis weight is 60 g / m or more, the wearer of the body fluid absorbent article 1 tends to feel fluffy. 2 If the above conditions are met, a wearer can obtain a sufficiently fluffy feel when wearing the bodily fluid absorbent article 1. "Fluffy feel" refers to a soft and gentle feel against the skin when worn.

[0038] In addition to flexibility, the compression recovery sheet 5 can also have the function of absorbing bodily fluids, but even if it exceeds a certain thickness under certain load conditions, its absorbency will not improve. The thickness at which the compression recovery sheet 5 can be expected to improve its absorbency of bodily fluids is, for example, 0.5 g / cm 2 Under load conditions of up to 2.5 mm thickness, 0.5 g / cm 2 When the thickness is 2.5 mm or more under the load condition, the absorbency of bodily fluids does not improve, but the flexibility improves.

[0039] (6)Adhesive layer The adhesive layer 6 is provided by applying an adhesive to the back sheet 3, etc. The adhesive used in the adhesive layer 6 is not particularly limited as long as it can attach the body fluid absorbent article 1 to underwear, etc., and examples thereof include adhesives such as water-soluble adhesives (e.g., acrylic water-soluble adhesives) and water-insoluble adhesives (e.g., rubber-based hot melt, olefin-based hot melt, etc.). 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. The adhesive layer 6 may be provided so as to cover the entire surface of the back sheet 3, or may be provided partially in the length direction of the back sheet 3. In the body fluid absorbent article 1 according to this embodiment, as shown in FIG. 2, the adhesive layer 6 is provided partially in the form of stripes formed at regular intervals in the length direction of the back sheet 3.

[0040] (7) Compressive deformation rate In the body fluid absorbent article 1 configured as described above, the compression recovery sheet 5 is disposed between the absorbent body 4 and the top sheet 2, and therefore the compression deformation rate T is set to an appropriate value, improving the wearer's comfort. The compression deformation rate T is an index showing the ease with which the body fluid absorbent article 1 deforms under a compressive load.

[0041] The compressive deformation rate T is expressed as T = (T1 - T2) / T1. T1 is a value of 0.5 gf / cm from the top sheet 2 side along the thickness direction of the absorbent article 1. 2 T2 is the thickness (mm) of the absorbent article 1 when a load of 2000 gf / cm is applied from the top sheet 2 side along the thickness direction of the absorbent article 1. 2 This is the thickness (mm) of the body fluid absorbent article 1 when a load of this value is applied.

[0042] In the body fluid absorbent article 1 according to this embodiment, the compressive deformation ratio T is preferably 0.75 or more, more preferably 0.79 or more, even more preferably 0.81 or more, and even more preferably 0.85 or more. If the compressive deformation ratio T is less than 0.75, the wearer tends to feel the article as being stiff, resulting in a poor feel when used.

[0043] The compression deformation rate T can be calculated using values ​​measured using a compression tester (KES-G5, manufactured by Kato Tech Co., Ltd.). First, the body fluid absorbent article 1 is placed on a horizontal measurement table with the top sheet 2 side facing up, and a rectangular frame-shaped weight (outer dimensions L8cm x W6cm, inner dimensions L6cm x W4cm) is placed on the body fluid absorbent article 1. Next, the body fluid absorbent article 1 is compressed toward the part of the body fluid absorbent article 1 located within the frame of the weight (here, the center part) at a speed of 0.10cm / sec using a sensor of the tester. Then, when the load compressing the body fluid absorbent article 1 is 0.5gf / cm 2 The thickness T1 (mm) of the absorbent article 1 at this time was measured, and the sensor was used to measure whether the load compressing the absorbent article 1 was 60 gf / cm 2 The thickness T2 (mm) of the bodily fluid absorbent article 1 at this time is measured. Then, the compressive deformation rate T can be calculated using the formula T=(T1-T2) / T1.

[0044] When calculating this compression deformation rate T, the target portion of the body fluid absorbent article 1 compressed by the sensor of the testing machine may be any portion other than the pressure-bonded portion 11, but it is preferable to measure in the region (sometimes referred to as the "liquid-permeable region") that faces the portion from which the wearer's body fluid is discharged when worn. The liquid-permeable region here refers to the central portion of the body fluid absorbent article 1. For example, in the vaginal discharge sheet 10 according to this embodiment, it is sufficient that the compression deformation rate T in at least the liquid-permeable region is 0.75 or more. However, it is more preferable that the compression deformation rate T in all portions excluding the pressure-bonded portion 11 is 0.75 or more.

[0045] (8) Coefficient of static friction The static friction coefficient of the surface of the top sheet 2, which is the surface layer of the bodily fluid absorbent article 1, is set as follows, so that the top sheet 2 is less likely to slip against the skin when in contact with the skin, and irritation caused by rubbing against the skin can be reduced. In other words, the static friction coefficient can affect the gentleness of the feel on the wearer's skin. In this embodiment, the static friction coefficient is set so that the slip start angle measured by the following slip start angle measurement method is α=37° or more.

[0046] (Method of measuring the start of slippage angle) A slippage start angle measuring device 7 (ball tack adhesive strength measuring device, manufactured by YOSHIMITSU SEIKI) as shown in Fig. 5 is used. In the slippage start angle measuring device 7, the absorbent article 1 is attached so that the back sheet 3 faces the inclined surface 72 of the inclined plate 71, the angle of which with respect to the horizontal plane is variable. A vinyl chloride sheet 73 (product name: Unisundae EB435-1, manufactured by Hikari Co., Ltd.) having a thickness of 0.5 mm is cut into a rectangle of 6 cm x 3 cm, and artificial leather 74 of Thoroughbred 602 manufactured by Kyowa Life Techno Co., Ltd., which is also cut into a rectangle of 6 cm x 3 cm, is attached to the vinyl chloride sheet 73 using double-sided tape to create a plate 75. This is placed on the body fluid absorbent article 1 so that the artificial leather 74 faces the top sheet 2.

[0047] The inclined plate 71 of the slip start angle measuring device 7 is moved from a horizontal state (i.e., the angle α between the horizontal plane and the inclined surface 72 = 0°) so that the angle α between the horizontal plane and the inclined surface 72 increases at a speed of 0.1° / sec. Then, the angle α between the horizontal plane and the inclined surface 72 when the plate body 75 starts to slip is defined as the slip start angle.

[0048] From the viewpoint of softness to the touch, the bodily fluid absorbent article 1 preferably has a slip start angle α of 37° or more, and more preferably has a slip start angle α of 40° or more. However, in the bodily fluid absorbent article 1 according to this embodiment, if emphasis is placed on softness, the slip start angle α may be less than 37°.

[0049] <Effects> As described above, the bodily fluid absorbent article 1 according to this embodiment has the compression recovery sheet 5 between the absorbent body 4 and the top sheet 2, and has a compression deformation rate T of 0.75 or more, so that the wearer is likely to feel a fluffy feeling when wearing the article, and is likely to obtain a good feeling when using the article. In addition, since a SAP sheet is used in the absorbent body, high absorbency can be obtained. Therefore, the bodily fluid absorbent article 1 according to this embodiment is likely to obtain a good feeling when using the article while maintaining high absorbency.

[0050] In addition, since the compression recovery sheet 5 has a compression resilience value of 6.5% or more, it can be kept in contact with the skin with an appropriate contact pressure, providing a high level of comfort. In addition, since it has high recovery properties, it is less likely to become twisted.

[0051] Furthermore, when the compression recovery sheet is an air-through nonwoven fabric, it is easy to obtain a fluffy feel and high compression recovery, so that it is easy to obtain a good feeling of use.

[0052] Moreover, since the dimensions between the absorbent body 4 and the outer peripheral edge of the body fluid absorbent article 1 are all 20 mm or less, body fluids are less likely to leak, resulting in a highly absorbent body fluid absorbent article 1. Furthermore, since the dimensions between the absorbent body 4 and the outer peripheral edge are 20 mm or less, there is no difference in compression rate between the part where the absorbent body 4 is located and the entire body fluid absorbent article 1, and wrinkling is less likely to occur.

[0053] In addition, since the slippage start angle α of the body fluid absorbent article is set to 37° or more, the skin and the top sheet 2 are less likely to rub against each other when worn, which reduces irritation to the skin caused by friction and improves the comfort of use.

[0054] <Modification> The above embodiment is merely one of various embodiments of the present invention. The embodiment can be modified in various ways depending on the design, etc., as long as the object of the present invention can be achieved. Modifications of the embodiment are listed below. The modifications described below can be applied in appropriate combination.

[0055] In the above embodiment, an example of the body fluid absorbent article 1 has been described as the panty liner 10, but the thickness and size of the body fluid absorbent article 1 are not particularly limited and can be appropriately set depending on the part of the body where it is worn. In addition, the shape of the body fluid absorbent article 1 is also not particularly limited. The body fluid absorbent article 1 according to this embodiment is formed in a roughly gourd shape in a plan view, but can be formed in various other shapes, such as a rectangular shape, a square shape, a circular shape, an elliptical shape, an oval shape, a polygonal shape, etc., depending on the part of the body where it is worn.

[0056] In the body fluid absorbent article 1 of the above embodiment, the pressure-bonded portion 11 is provided on the outer peripheral edge of the body fluid absorbent article 1, but in the present invention, it may be provided around the entire outer peripheral edge, on the inside away from the outer peripheral edge.

[0057] In the bodily fluid absorbent article 1 according to the above embodiment, unevenness is not formed on the surface of the top sheet 2 (excluding the pressure-bonded parts 11) by embossing or the like, but unevenness may be formed by embossing or the like.

[0058] In the bodily fluid absorbent article 1 according to the above embodiment, the top sheet 2, compression recovery sheet 5, and back sheet 3 are bonded together with an adhesive and are also fixed to each other by the pressure-bonding parts 11, but the present invention is not limited to this, and the top sheet 2, compression recovery sheet 5, absorber 4, and back sheet 3 may be bonded together only by an adhesive. Examples of adhesives include water-soluble adhesives (e.g., acrylic water-soluble adhesives) and water-insoluble adhesives (e.g., rubber-based hot melt, olefin-based hot melt). The bodily fluid absorbent article 1 may be constructed by fixing only at the pressure-bonding parts 11 without bonding with an adhesive.

[0059] In the body fluid absorbent article 1 according to the above embodiment, the pressure-bonded portion 11 is formed by pressure-bonding the top sheet 2, the compression recovery sheet 5, and the back sheet 3, but the present invention is not limited to this. The pressure-bonded portion 11 may be formed, for example, by pressure-bonding the top sheet 2, the compression recovery sheet 5, the absorbent body 4, and the back sheet 3, by pressure-bonding only the top sheet 2 and the back sheet 3, by pressure-bonding the top sheet 2, the compression recovery sheet 5, and the back sheet 3, or by pressure-bonding the top sheet 2, the compression recovery sheet 5, and the back sheet 3.

[0060] The body fluid absorbent article 1 according to the above embodiment has a four-layer structure consisting of the top sheet 2, compression recovery sheet 5, absorbent body 4 and back sheet 3, but the present invention is not limited to this. In the body fluid absorbent article 1 according to the present invention, for example, a sheet (liquid diffusion sheet) having a liquid permeability effect, a liquid diffusion effect, or suppressing backflow of body fluids into the top sheet 2 may be provided between the top sheet 2 and the compression recovery sheet 5. The liquid diffusion sheet may also be provided between the compression recovery sheet 5 and the absorbent body 4. A hydrophilic spunbond is preferably used as the liquid diffusion sheet.

[0061] <Example> The present invention will be described in more detail below with reference to examples, although the absorbent article according to the present invention is not limited to the following examples.

[0062] (1) Example 1 The bodily fluid absorbent article according to Example 1 had a top sheet, a compression recovery sheet and an absorbent body configured as follows, and a back sheet made of a polyethylene film. Then, a test was carried out using the bodily fluid absorbent article according to Example 1. Top sheet: A nonwoven fabric made from cotton using the spunlace method. The basis weight is 30 g / m 2 It was decided. Compression recovery sheet: A nonwoven fabric made by mixing PET / PE (core: PET, sheath: PE core-sheath structure) and PET using the air-through method. The basis weight is 60g / m 2 It was decided. -Absorbent: SAP, pulp and PP / PE (core: PP, sheath: PE core-sheath structure) are defibrated and mixed by the airlaid method, and then accumulated and molded to a weight of 150g / m 2 The surface of the nonwoven fabric was not embossed. The shape of the absorbent body was made to follow the outer edge of the top sheet, and the distance between the outer edge of the body fluid absorbent article and the absorbent body was 1.2 cm at the longitudinal end and 0.5 cm at the lateral end.

[0063] The tests included calculating the compression deformation rate and compression resilience value. In addition, a sensory test for softness ("Softness" in the table), twist deformation rate, static friction coefficient, sensory test for texture ("Gentleness"), and absorption capacity were also performed.

[0064] The compressive deformation ratio was measured and calculated using the same method as that described in "(7) Compressive deformation ratio" in the above embodiment.

[0065] The compression resilience value was measured and calculated using the same measurement method as described in “(5) Compression recovery sheet” in the above embodiment.

[0066] A sensory test for the fluffy feel was conducted as follows. Thirty people wore the body fluid absorbent article and rated it as follows: If 20 or more wearers felt it had a soft and gentle touch (i.e., a fluffy feel): "◎" If 15 or more wearers felt it had a fluffy feel: "◯" If 14 or fewer wearers felt it had a fluffy feel: "X".

[0067] The twist deformation rate was measured as follows. The leg width of the doll capable of reproducing the walking movement was set to 75 mm, the angle between the legs was set to 30°, and the bodily fluid absorbent article was attached to the shorts to be worn by the doll so that 1 / 3 of the length of the article was located forward from the center seam, and the shorts were then worn by the doll. The bodily fluid absorbent article attached to the shorts was photographed together with another article of known size, and this was used as the photograph before walking.

[0068] The doll's legs were then moved 100 steps at 60 steps / min. The doll was then carefully removed from the shorts with the bodily fluid absorbent article attached, and photographed together with other items of known size to obtain the photograph after walking. Using image analysis software ImageJ, the area of ​​each of the bodily fluid absorbent articles before and after walking was calculated from the photographs before and after walking. The ratio of the area of ​​the bodily fluid absorbent article after walking to the area before walking was determined as the twist deformation rate.

[0069] The static friction coefficient (static friction coefficient) was measured by the method described in (Method of measuring the slip start angle) in “(8) Static friction coefficient” above.

[0070] A sensory test for texture was conducted as follows. Thirty people wore the body fluid absorbent article and rated it as follows: If 20 or more wearers felt it was gentle on the skin: "◎" If 15 or more wearers felt it was gentle on the skin: "◯" If 14 or fewer wearers felt it was gentle on the skin: "X".

[0071] The amount of absorption was measured as follows. A bodily fluid absorbent article was attached onto the filter paper, and physiological saline was dropped onto the center of the surface of the bodily fluid absorbent article. After one minute, a 0.5 mm thick polyvinyl chloride sheet (product name: Unisandee EB435-1, manufactured by Hikari Co., Ltd.) was placed on top, and a weight with a base area of ​​10 cm x 10 cm and a weight of 3.5 kg was placed on the polyvinyl chloride sheet. The load applied to the filter paper at this time was 35 g / m2. 2 It was left in this state for one minute. After that, it was checked whether the saline solution had leaked out onto the filter paper, and the maximum amount of saline solution that did not leak out was recorded as the absorption amount. The results are shown in Table 1 below.

[0072] (2) Example 2 The bodily fluid absorbent article according to Example 2 had a top sheet, a compression recovery sheet and an absorbent body configured as follows, and a back sheet made of a polyethylene film. Then, a test was carried out using the bodily fluid absorbent article according to Example 2. Top sheet: A nonwoven fabric made from cotton using the spunlace method. The basis weight is 30 g / m 2 It was decided. Compression recovery sheet: A nonwoven fabric made by mixing PET / PE and PET using the air-through method. The basis weight is 60g / m 2 It was decided. -Absorbent: SAP, pulp and PP / PE are defibrated and mixed by the airlaid method, then accumulated and molded into a material with a basis weight of 150g / m 2 The surface of the nonwoven fabric was not embossed. The shape of the absorbent body was a rectangle measuring 3.5 cm x 11.5 cm. The distance between the outer edge of the body fluid absorbent article and the absorbent body was 3.5 cm at the longitudinal end and 2.2 cm at the lateral end.

[0073] The compression deformation rate and compression resilience value were calculated. In addition, a sensory test for softness, twist deformation rate, static friction coefficient, sensory test for skin feel, and absorption capacity were also performed. The results are shown in Table 1 below.

[0074] (3) Example 3 The bodily fluid absorbent article according to Example 3 had the following configurations for the top sheet, compression recovery sheet and absorbent body, and the back sheet was made of a polyethylene film. Tests were then conducted using the bodily fluid absorbent article according to Example 3. Top sheet: A nonwoven fabric made of polypropylene by the spunbond method. The basis weight is 18 g / m 2 It was decided. Compression recovery sheet: A nonwoven fabric made by mixing PET / PE and PET using the air-through method. The basis weight is 60g / m 2 It was decided. -Absorbent: SAP, pulp and PP / PE are defibrated and mixed by the airlaid method, then accumulated and molded into a material with a basis weight of 150g / m 2 The surface of the nonwoven fabric was not embossed. The shape of the absorbent body was a rectangle measuring 3.5 cm x 11.5 cm. The distance between the outer edge of the body fluid absorbent article and the absorbent body was 3.5 cm at the longitudinal end and 2.2 cm at the lateral end.

[0075] The compression deformation rate and compression resilience value were calculated. In addition, a sensory test for softness, twist deformation rate, static friction coefficient, sensory test for skin feel, and absorption capacity were also performed. The results are shown in Table 1 below.

[0076] (4) Example 4 The bodily fluid absorbent article according to Example 4 had a top sheet, a compression recovery sheet and an absorbent body configured as follows, and a back sheet made of a polyethylene film. Then, a test was carried out using the bodily fluid absorbent article according to Example 4. Top sheet: A nonwoven fabric made from cotton using the spunlace method. The basis weight is 30 g / m 2 It was decided. Compression recovery sheet: A nonwoven fabric made by mixing PET / PE and PET using the air-through method. The basis weight is 40g / m 2 It was decided. -Absorbent: SAP, pulp and PP / PE are defibrated and mixed by the airlaid method, then accumulated and molded into a material with a basis weight of 150g / m 2 The surface of the nonwoven fabric was not embossed. The shape of the absorbent body was a rectangle measuring 3.5 cm x 11.5 cm. The distance between the outer edge of the body fluid absorbent article and the absorbent body was 3.5 cm at the longitudinal end and 2.2 cm at the lateral end.

[0077] The compression deformation rate and compression resilience value were calculated. In addition, a sensory test for softness, twist deformation rate, static friction coefficient, sensory test for skin feel, and absorption capacity were also performed. The results are shown in Table 1 below.

[0078] (5) Example 5 The bodily fluid absorbent article according to Example 5 had the following configurations for the top sheet, compression recovery sheet and absorbent body, and the back sheet was made of a polyethylene film. Tests were then carried out using the bodily fluid absorbent article according to Example 5. Top sheet: A nonwoven fabric made from cotton using the spunlace method. The basis weight is 30 g / m 2 It was decided. Compression recovery sheet: A nonwoven fabric made by mixing PET / PE and PET using the air-through method. The basis weight is 20g / m 2 It was decided. -Absorbent: SAP, pulp and PP / PE are defibrated and mixed by the airlaid method, then accumulated and molded into a material with a basis weight of 150g / m 2 The surface of the nonwoven fabric was not embossed. The shape of the absorbent body was a rectangle measuring 3.5 cm x 11.5 cm. The distance between the outer edge of the body fluid absorbent article and the absorbent body was 3.5 cm at the longitudinal end and 2.2 cm at the lateral end.

[0079] The compression deformation rate and compression resilience value were calculated. In addition, a sensory test for softness, twist deformation rate, static friction coefficient, sensory test for skin feel, and absorption capacity were also performed. The results are shown in Table 1 below.

[0080] (6) Comparative Example 1 The top sheet and absorbent body of the body fluid absorbent article according to Comparative Example 1 were configured as follows, and the back sheet was made of a polyethylene film. Tests were then conducted using the body fluid absorbent article according to Comparative Example 1. Note that the body fluid absorbent article according to Comparative Example 1 was not provided with a compression recovery sheet. Top sheet: A nonwoven fabric made from cotton using the spunlace method. The basis weight is 30 g / m 2 It was decided. -Absorbent: SAP, pulp and PP / PE are defibrated and mixed by the airlaid method, then accumulated and molded into a material with a basis weight of 150g / m 2 The surface of the nonwoven fabric was not embossed. The shape of the absorbent body was a rectangle measuring 3.5 cm x 11.5 cm. The distance between the outer edge of the body fluid absorbent article and the absorbent body was 3.5 cm at the longitudinal end and 2.2 cm at the lateral end.

[0081] As the test, the compression deformation rate and compression resilience value were calculated. In addition, a sensory test for the softness, the twist deformation rate, the static friction number, the sensory test for the feel on the skin, and the absorption amount were also tested. The results are shown in Table 1 below.

[0082] (7) Comparative Example 2 For the body fluid absorbent article according to Comparative Example 2, the top sheet and compression recovery sheet were configured as follows, and the back sheet was configured from a polyethylene film. Tests were then conducted using the body fluid absorbent article according to Comparative Example 2. Note that the body fluid absorbent article according to Comparative Example 2 was not provided with an absorbent body. Top sheet: A nonwoven fabric made from cotton using the spunlace method. The basis weight is 30 g / m 2 It was decided. Compression recovery sheet: A nonwoven fabric made by mixing PET / PE and PET using the air-through method. The basis weight is 40g / m 2 It was decided.

[0083] The compression deformation rate and compression resilience value were calculated. In addition, a sensory test for softness, twist deformation rate, static friction coefficient, sensory test for skin feel, and absorption capacity were also performed. The results are shown in Table 1 below.

[0084] (8) Comparative Example 3 For the body fluid absorbent article of Comparative Example 3, the top sheet, compression recovery sheet and absorbent body were configured as follows, and the back sheet was configured from a polyethylene film. Then, a test was carried out using the body fluid absorbent article of Comparative Example 3. Top sheet: A nonwoven fabric made from cotton using the spunlace method. The basis weight is 30 g / m 2 It was decided. Compression recovery sheet: A nonwoven fabric made from polypropylene using the spunbond method. The basis weight is 18g / m 2 It was decided. -Absorbent: SAP, pulp and PP / PE (core: PP, sheath: PE core-sheath structure) are defibrated and mixed by the airlaid method, and then accumulated and molded to a weight of 150g / m 2 The surface of the nonwoven fabric was not embossed. The shape of the absorbent body was a rectangle measuring 3.5 cm x 11.5 cm. The distance between the outer edge of the body fluid absorbent article and the absorbent body was 3.5 cm at the longitudinal end and 2.2 cm at the lateral end.

[0085] The compression deformation rate and compression resilience value were calculated. In addition, a sensory test for softness, twist deformation rate, static friction coefficient, sensory test for skin feel, and absorption capacity were also performed. The results are shown in Table 1 below.

[0086] (9) Comparative Example 4 The bodily fluid absorbent article according to Comparative Example 4 had a top sheet, a compression recovery sheet and an absorbent body configured as follows, and a back sheet made of a polyethylene film. Tests were then carried out using the bodily fluid absorbent article according to Comparative Example 4. Top sheet: A nonwoven fabric made from cotton using the spunlace method. The basis weight is 30 g / m 2 It was decided. Compression recovery sheet: A nonwoven fabric made from polypropylene using the spunbond method. The basis weight is 18g / m 2 It was decided. Absorbent: SAP, pulp and dish paper, with a basis weight of 150g / m 2 The absorbent body was embossed on the entire surface. The shape of the absorbent body was a rectangle measuring 3.5 cm x 11.5 cm. The distance between the outer edge of the body fluid absorbent article and the absorbent body was 3.5 cm at the longitudinal end and 2.2 cm at the lateral end.

[0087] The compression deformation rate and compression resilience value were calculated. In addition, a sensory test for softness, twist deformation rate, static friction coefficient, sensory test for skin feel, and absorption capacity were also performed. The results are shown in Table 1 below. [Table 1]

[0088] As shown in Table 1, it was demonstrated from Examples 1-5 and Comparative Examples 1-4 that a fluffy feel is difficult to obtain when the compression deformation ratio is 0.73 or less, whereas in order to effectively obtain a fluffy feel, it is effective for the compression deformation ratio of the body fluid absorbent article to be 0.75 or more.

[0089] Comparing Comparative Example 2 and Comparative Example 3, the compression resilience value was 13.9 in Comparative Example 2 and 6.02 in Comparative Example 3, but the twist deformation rate was 80% in Comparative Example 2 and 76% in Comparative Example 3. Therefore, it was found that if the compression resilience value is 6.02 or less, twisting is likely to occur.

[0090] Comparing Example 1 and Example 2-5, the dimension from the end of the SAP sheet to the outer edge of the absorbent article in Example 1 was 20 mm or less, whereas in Examples 2-5 it was greater than 20 mm in all cases. The absorption amount was 2 cc in Example 1, whereas it was 1.8 cc in Examples 2-5. Therefore, it was demonstrated that the absorption amount can be increased when the dimension between the absorbent body and the outer edge of the absorbent article is 20 mm or less. In addition, the twist deformation rate was 95% in Example 1, whereas it was 89% or less in Examples 2-5. Therefore, it was demonstrated that the twisting is less likely to occur when the dimension between the absorbent body and the outer edge of the absorbent article is 20 mm or less.

[0091] Comparing Example 3 with Examples 1 and 2, the sliding start angle was 35° in Example 3, while it was 40° in Examples 1 and 2, and the gentleness of the feel on the skin was rated as "good" in Example 3, while it was rated as "good" in Examples 1 and 2. It is believed that such results were obtained because the frictional force of the top sheet affects the conformability of the top sheet to the skin that is in contact with it. Therefore, it was found that when the sliding start angle is 35° or less, the gentleness of the feel on the skin is somewhat impaired.

[0092] Comparing Example 4 and Comparative Example 2, Example 4, which has an absorbent body (SAP sheet), has a compression deformation rate of 0.81, whereas Comparative Example 2, which does not have an absorbent body, has a compression deformation rate of 0.47. The only difference between Example 4 and Comparative Example 2 is the presence or absence of an absorbent body. This shows that by overlapping the absorbent body (SAP sheet) and the compression recovery sheet, the compression deformation rate and fluffiness are improved compared to the case of only the compression recovery sheet. [Explanation of symbols]

[0093] 1. Body fluid absorbent articles 2 Top sheet 3 Back seat 4. Absorber 40 SAP sheets 5. Compression recovery sheet 71 Inclined plate 72 Slope 73 Acrylic Board 74 Artificial leather T Compressive deformation ratio

Claims

1. a top sheet which is a surface layer in contact with the wearer's skin and is made of natural fibers, preferably cotton; A back sheet which is a back surface layer; an absorbent body disposed between the top sheet and the back sheet; A body fluid absorbent article comprising: The absorbent body is an SAP sheet containing an absorbent polymer, The device further includes a compression recovery sheet disposed between the absorbent body and the top sheet over the entire area of ​​the absorbent body, The compressive deformation ratio of the body fluid absorbent article is 0.75 or more. Body fluid absorbing articles.

2. The compression recovery sheet has a compression resilience value of 6.5% or more. The body fluid absorbent article according to claim 1.

3. The compression recovery sheet is an air-through nonwoven fabric. The body fluid absorbent article according to claim 1 or 2.

4. The distance between the absorbent body and the outer peripheral edge of the body fluid absorbent article is 20 mm or less. The body fluid absorbent article according to any one of claims 1 to 3.

5. The slip start angle of the body fluid absorbent article measured by a slip start angle measuring method is 37° or more. The body fluid absorbent article according to any one of claims 1 to 4.

6. The amount of physiological saline absorbed is 1.5 cc or more. The body fluid absorbent article according to any one of claims 1 to 5.

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