JP2020093090A - Absorbent article - Google Patents

Abstract

To provide an absorbent article capable of improving absorptivity of watery feces.SOLUTION: An absorbent article to be worn at a crotch of a wearer includes an absorber and a liquid-permeable sheet covering the surface on a wearer's side of the absorber. The absorber has a pulp whose pulp amount is 60 g/mor more and whose size is 500 mm or more in a longitudinal direction and 100 mm or wider in the width direction. The liquid-permeable sheet has a layered part whose static friction coefficient of a surface in contact with the wearer is 0.59 or more and which layers a part of a core wrap sheet wrapping the absorber and a top sheet covering the absorber wrapped in the core wrap sheet, and ventilation resistance of the respective members in the layered part is smaller than 0.0962 kPa.sec/m.SELECTED DRAWING: Figure 7

Description

The present invention relates to absorbent articles such as disposable diapers, pads and sanitary napkins.

BACKGROUND ART Conventionally, an absorbent article is provided with an absorbent body extending in the longitudinal direction connecting the abdomen side and the back side of a wearer, as disclosed in Patent Document 1, for example. By this absorber, excreted liquid such as urine and menstrual blood is absorbed. By disposing this absorbent body between the liquid-permeable top sheet and the liquid-impermeable back sheet, the absorbent article absorbs urine excreted in the top sheet by the absorbent body and absorbs it by the absorbent body. Prevents leaked urine with a back sheet.

International Publication No. 2016/114209

By the way, as the liquid-permeable material forming the top sheet, for example, a non-woven fabric is used. Since a non-woven fabric can realize a soft touch, it is suitable as a material for a top sheet that comes into contact with the wearer's skin. However, urine and menstrual blood, as well as stool and watery feces, are excreted from the wearer. Stool is mostly solid, and watery stool is a mixture of solid and liquid. And the absorber of an absorptive article cannot absorb a solid matter. Therefore, when the wearer of the absorbent article excretes stool or watery feces, the absorbent article is replaced.

When exchanging the absorbent article, it is necessary to perform the exchanging work so that the excrement remaining on the top sheet is not dropped from the absorbent article. However, in the case of watery feces, since liquid is mixed with solid matter, it takes time for the liquid to permeate through the top sheet as compared with urine. Therefore, watery feces are more likely to leak when the absorbent article is removed from the wearer, as compared to urine and stool.

Therefore, an object of the present invention is to provide an absorbent article capable of improving the absorbability of watery feces.

In order to solve the above problems, in the present invention, the absorber has a pulp amount of 60 g/m ² or more and a pulp having a size of 500 mm or more in the longitudinal direction and 100 mm or more in the width direction. The liquid permeable sheet covering the side surface was wrapped with the core wrap sheet and a part of the core wrap sheet that wraps the absorber, with the coefficient of static friction of the surface contacting the wearer being 0.59 or more. The ventilation resistance of each member in the layered portion where the top sheet covering the absorber was overlapped was made smaller than 0.0962 kPa·sec/m.

More specifically, the present invention is an absorbent article that is worn on the crotch of a wearer, including an absorber and a liquid-permeable sheet that covers the wearer-side surface of the absorber. The liquid permeable sheet having a pulp amount of 60 g/m ² or more and a size of 500 mm or more in the longitudinal direction and 100 mm or more in the width direction has a static friction coefficient of 0. 59 or more, and has a laminated portion in which a part of the core wrap sheet that wraps the absorber and a top sheet that covers the absorber that is wrapped in the core wrap sheet are laminated, and the ventilation resistance of each member in the laminated portion Is 0.0962
It is smaller than kPa·sec/m.

The liquid-permeable sheet has one or more predetermined members between the core wrap sheet and the top sheet, and the ventilation resistance of the laminated portion of the predetermined members is less than 0.0962 kPa·sec/m. May be

The absorber has at least two layers, and the wearer side layer may contain a larger amount of particles of SAP, which is a superabsorbent polymer, than the other layers.

The absorber may have two or more layers, and at least one of the layers may be a layer of SAP particles.

The above absorbent article can improve the absorbability of watery feces.

FIG. 1 is a perspective view of a diaper according to an embodiment. FIG. 2 is an exploded perspective view of the diaper. FIG. 3 is a cross-sectional view of the diaper in a non-wearing state when the center in the longitudinal direction is cut along the width direction. FIG. 4 is a diagram illustrating a test method for verifying the absorbability of watery feces. FIG. 5 is a diagram showing types of core wrap sheets of test samples prepared for verification. FIG. 6 is a first diagram showing the test results. FIG. 7 is a first diagram showing the measurement results of ventilation resistance. FIG. 8 is a second diagram showing the measurement results of the ventilation resistance. FIG. 9 is a second diagram showing the test results. FIG. 10 is a table showing the results of measuring the feeling of wearing. FIG. 11 is a diagram showing the physical properties of the top sheet and the core wrap sheet used for the verification of the core. FIG. 12 is a third diagram showing the test results.

Hereinafter, an absorbent article according to an embodiment of the present invention will be described with reference to the drawings. The configurations of the following embodiments are exemplifications, and the present invention is not limited to the configurations of these embodiments.

<Embodiment>
In the present embodiment, a tape-type disposable diaper (an example of an “absorbent article” in the present application, hereinafter simply referred to as “diaper”) faces a front body and a back arranged to face the wearer's abdomen. The direction connecting the rear body arranged in this manner is the longitudinal direction. Inseam that is placed between the front body (one side in the longitudinal direction) and the back body (the other side in the longitudinal direction) (center in the longitudinal direction) in the crotch of the wearer (placed opposite the crotch). The department is located. Further, in a state where the disposable diaper is worn by the wearer (hereinafter, abbreviated as "wearing state"), the side facing the wearer's skin (inside when worn) is the skin surface side, and the side opposite the skin surface side. The (outside when worn) is the non-skin side. Furthermore, the direction connecting the skin surface side and the non-skin surface side is the thickness direction, and the direction orthogonal to both the longitudinal direction and the thickness direction is the width direction. In addition, viewing from the thickness direction is a plan view.

FIG. 1 is a perspective view of the diaper according to the present embodiment. The diaper 1 is a crotch region 1B that is a region corresponding to a crotch region that covers the wearer's pubic region in a worn state, and a front body region 1F that is located on the front side of the crotch region 1B and that corresponds to the wearer's front body. And a rear body region 1R which is located behind the crotch region 1B and corresponds to the rear body of the wearer. Tapes 2L and 2R that can be attached to the front patch 2F provided on the non-skin surface side of the front body region 1F are provided on the left and right edges of the rear body region 1R. Therefore, in the diaper 1, when the front body region 1F is arranged on the wearer's ventral side and the back body region 1R is arranged on the wearer's back side, the tapes 2L, 2R are attached to the front patch 2F. , It is fixed to the wearer's body while surrounding the wearer's abdominal circumference and thighs. Since the diaper 1 is fixed to the wearer's body in such a form, the wearer can walk while wearing the diaper 1.

In the diaper 1, a mat 6 capable of absorbing and holding a liquid is arranged mainly around the crotch region 1B. In addition, in the diaper 1, in order to suppress the formation of a gap serving as a liquid outflow route between the diaper 1 and the wearer's skin, the three-dimensional gathers 3BL, 3BR are provided around the wearer's thigh. Is provided, and the waist gather 3R is provided in a portion surrounding the abdominal circumference of the wearer. The three-dimensional gathers 3BL and 3BR and the waist gather 3R are in close contact with the wearer's skin by the elastic force of the rubber thread. Therefore, the liquid excreted from the pubic area of the wearer is absorbed by the mat 6 of the diaper 1 with almost no leakage from the diaper 1.

FIG. 2 is an exploded perspective view of the diaper 1. Further, FIG. 3 is a cross-sectional view of the diaper 1 in the non-wearing state when the center in the longitudinal direction is cut along the width direction. The diaper 1 has a cover sheet 4 that forms an outer surface in the worn state. The cover sheet 4 is a sheet-like member having a substantially rectangular outer shape in which constrictions 4KL and 4KR are provided in a portion corresponding to the long side, and forms the exterior surface of the diaper 1. The constrictions 4KL and 4KR are provided at positions where the wearer's thighs are located. The cover sheet 4 is provided to reinforce the back sheet 5 and to improve the touch. For example, in order to suppress excrement leakage, a nonwoven fabric made of a liquid-impermeable thermoplastic resin may be used as the material. it can. Examples of the liquid-impermeable thermoplastic resin include polyethylene (PE) and polypropylene (PP). The cover sheet 4 is not limited to a single layer structure and may have a multilayer structure including an inner cover sheet and an outer cover sheet.

The diaper 1 has a back sheet 5, a mat 6, and a top sheet 7, which are sequentially stacked on the skin side surface of the cover sheet 4. The back sheet 5, the mat 6, and the top sheet 7 are sheet-shaped members each having a substantially rectangular appearance, and are laminated in order on the cover sheet 4 in a state where the longitudinal direction matches the longitudinal direction of the cover sheet 4. . Similar to the cover sheet 4, the back sheet 5 is a sheet formed of a liquid-impermeable thermoplastic resin as a material in order to suppress leakage of excrement. The top sheet 7 is a sheet-like member that is arranged on the skin side of the wearer so as to cover the water absorbing surface of the mat 6. The top sheet 7 has liquid permeability in part or all. Therefore, in the state where the diaper 1 is worn, the liquid excreted from the wearer enters the mat 6 through the top sheet 7 that may come into contact with the wearer's skin, and is absorbed there. For example, woven cloth, non-woven cloth, and porous film can be used as the material of the top sheet 7. The top sheet 7 may have hydrophilicity.

The backsheet 5, mat 6, and topsheet 7 all extend from the front body region 1F to the back body region 1R. Therefore, when the cover sheet 4 in which the back sheet 5, the mat 6 and the top sheet 7 are laminated covers the pubic area of the wearer, both longitudinal end portions of the back sheet 5, the mat 6 and the top sheet 7 are It is located on the ventral and dorsal sides of the. That is, the wearer's genital area is in a state of being covered with the mat 6 from the wearer's ventral side to the back side. Therefore, even if the wearer excretes the liquid out of the body in any of the postures with the belly down and the back down, the excreted liquid contacts the mat 6 through the top sheet 7. It will be.

Further, the diaper 1 has elongated strip-shaped side sheets 8L and 8R for forming the above-mentioned three-dimensional gathers 3BL and 3BR. The side sheets 8L and 8R are liquid impermeable sheets provided on the long side portions of the top sheet 7. Similar to the three-dimensional gathers 3BL and 3BR of the diaper 1, the side seats 8L and 8R are provided with constrictions 8KL and 8KR at positions where the wearer's thighs are located. Thread rubbers 8EL and 8ER are woven in the side sheets 8L and 8R along the longitudinal direction. Therefore, when the diaper 1 is in the mounted state, that is, when the diaper 1 has a U-shape in a side view, the side sheets 8L and 8R are attracted in the longitudinal direction by the contracting force of the rubber thread 8EL and 8ER. It becomes a three-dimensional gather that rises from the top and prevents the outflow of liquid.

Further, the rubber thread 9ER for forming the above-mentioned waist gather 3R is provided between the back sheet 5 and the top sheet 7 at a position further back than the end portion of the mat 6. The rubber thread 9ER is provided between the back sheet 5 and the top sheet 7 in a direction in which the longitudinal direction that is the stretching direction is the left-right direction of the diaper 1. Therefore, when the tapes 2L and 2R provided on both the left and right sides of the thread rubber 9ER are attached to the front patch 2F on the abdominal side of the wearer, the thread rubber 9ER exerts a contracting force on the diaper 1 for the wearer. The close contact prevents the formation of a gap between the diaper 1 and the wearer's abdominal girth. The cover sheet 4 is also provided with thread rubbers 4SL and 4SR that prevent a gap from being formed between the diaper 1 and the wearer's abdominal circumference along the longitudinal direction. The rubber thread 4SL, 4SR is provided at an appropriate position in an appropriate number determined according to the elastic force (contractile force) required in the diaper 1 in terms of design.

The mat 6 contains water in the spaces between short fibers of cellulosic fibers such as pulp fibers, rayon fibers, or cotton fibers, or short fibers obtained by hydrophilizing synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate. It has a structure in which a granular absorbent resin such as SAP (super absorbent polymer: Super Absorbent Polymer), which is a hydrophilic polymer having a crosslinked structure capable of absorbing and holding, is retained. Therefore, in the mat 6, the volume change of the absorbent resin before and after absorbing the liquid is basically performed within the short fiber that holds the absorbent resin in the gap. Therefore, from a bird's eye view of the entire mat 6, it can be said that the expansion coefficient of the thickness of the mat 6 that has absorbed the liquid is not so large as the expansion coefficient of the absorbent resin itself.

The SAP particles of the present embodiment refer to granular resin compositions containing SAP. The term "resin composition containing SAP" as used herein refers to both a composition composed only of SAP and a composition containing SAP as a main component and containing another substance to the extent that it does not adversely affect water absorption. Is a concept that includes. Examples of the “other substance” include an additive (a surface modifier added for the purpose of hydrophobizing the particle surface), an unreacted monomer remaining during the synthesis of SAP, and the like.

By the way, as shown in FIG. 3, the mat 6 of the above-described embodiment has a core 6C (an example of an “absorbent” in the present application) in which SAP is mixed with crushed pulp (so-called “fluff pulp”). It is wrapped with a core wrap sheet 6W. In the diaper 1, the skin-side surface of the core 6C (corresponding to the "wearer-side surface" in the present application) is wrapped in the core wrap sheet 6W and the part of the core wrap sheet 6W that wraps the core 6C. It is covered by a laminated portion in which the top sheet 7 covering the wrapped core 6C is overlapped. Since both the core wrap sheet 6W and the top sheet 7 are liquid-permeable sheets, the laminated portion has liquid permeability. In the laminated portion, one or a plurality of sheets (which is an example of the “predetermined member” in the present application) may be provided between the top sheet 7 and the core wrap sheet 6W. Further, the core 6C may have a single-layer structure or a multi-layer structure having two or more layers. In the latter case, at least one layer is composed of SAP particles. It may be a layer. If such a layer composed of SAP particles is provided, the mat 6 can quickly absorb the water of urine or watery feces discharged from the wearer, and allow time for the water to contact the wearer's skin. It can be suppressed as much as possible. When the core 6C has a total three-layer structure of, for example, two layers composed of crushed pulp and SAP layers arranged between these layers, the SAP layer which is an intermediate layer is arranged above and below. Since it is between layers, the moisture can be diffused by the capillary phenomenon, and since the moisture is absorbed and retained by the SAP in the region, the moisture is absorbed by the core 6C and the moisture flows back to the wearer's skin. It is possible to suppress the contact of water.

In the diaper 1 of the present embodiment, the ventilation resistance of each member in the laminated portion of the core wrap sheet 6W covering the skin side of the core 6C and the top sheet 7 is smaller than 0.0962 kPa·sec/m. Is becoming This ventilation resistance is a value measured by a ventilation tester (KES-F8-AP1) manufactured by Kato Tech Co., Ltd. Further, in the diaper 1 of the present embodiment, the coefficient of static friction on the surface of the top sheet 7 is 0.59 or more. Therefore, the diaper 1 of the present embodiment is superior in the absorbency when excreted watery feces as follows, as compared with the diaper of the comparative example in which the ventilation resistance or the static friction coefficient is outside this range. ..

<Verification of liquid flow>
FIG. 4 is a diagram illustrating a test method for verifying the absorbability of watery feces. In this verification, a mat having a width of 280 mm and a length of 560 mm was used as a test sample corresponding to the mat 6. Then, the mat is placed on a slope having an inclination angle of 30 degrees with the longitudinal direction aligned with the vertical direction of the slope, and 50 g of a reagent simulating watery feces is placed at a position 450 mm from the lower end of the mat. I dropped it. In this verification, the distance (diffusion length) in which the reagent simulating aqueous feces flows on the mat surface and the amount absorbed by the mat were confirmed. In this verification, 50 g of the reagent is completely absorbed by the mat, and the shorter diffusion length is superior.

In this verification, 10 types of test samples were prepared, and the respective absorptivities were compared. The ten types of test samples are obtained by staggering the types of core wrap sheets that wrap the core, and all of the cores have the same core. The core is pulp having a basis weight of 260 g/cm ² that does not contain SAP (width is 280 mm and length is 560 mm). FIG. 5 is a diagram showing types of core wrap sheets of test samples prepared in this verification.

In FIG. 5, among the 10 types of test samples, those corresponding to the mat 6 of the above-described embodiment are referred to as “Examples 1 to 6”, and those corresponding to the comparative examples are referred to as “Comparative Examples 1 to 4”.

In Examples 1 to 3 and Comparative Example 4, a non-woven fabric prepared by an air-through method is used for the core wrap sheet. The air-through type nonwoven fabric is formed by carding (opening) the raw material fibers and then heat-bonding the fibers by hot air treatment. The weight per unit area of the core wrap sheet is 20.0 g/m ² in Examples 1 and 3, 22.0 g/m ² in Example ² , and 21.0 g/m ² in Comparative Example 4.

Moreover, in Examples 4 and 5, the nonwoven fabric produced by the spun bond method was used for the core wrap sheet. The weight per unit area of the core wrap sheet is 18.0 g/m ² in Example 4 and 17.5 g/m ² in Example 5. The spunbond type nonwoven fabric is formed by carding the raw material fibers, entwining the fibers with high pressure water to form a sheet, and drying the sheet.

Moreover, in Comparative Examples 1 to 3 and Example 6, a tissue is used for the core wrap sheet. Basis weight of the tissue paper, Comparative Example 1 is 19.5 g / ^{m 2,} Comparative Example 2 is 16.0 g / ^{m 2,} Comparative Example 3 is 14.0 g / ^{m 2,} Example 6 14 It is 0.0 g/m ² .

The reagent used for this verification was prepared by mixing bentonite in ion-exchanged water and stirring it, and those within 3 days after preparation were used as a simulated product of watery feces. The reagent has a water content of 94% by weight (for example, 1 kg of the reagent is prepared by mixing 940 g of water and 60 g of bentonite).

When the absorbability of watery feces was verified with respect to these 10 types of test samples, Examples 1 to 6 all had better results than Comparative Examples 1 to 4. FIG. 6 is a first diagram showing the test results. What is shown in the column of “diffusion range” in FIG. 6 is a photograph of the surface of the test sample. In addition, what is shown in the column of "diffusion length" in FIG. 6 represents the distance from the position where the reagent has dropped to the position where the reagent has flown on the surface of the mat. Further, what is shown in the column of "leakage amount" in FIG. 6 shows the amount of the reagent leaked from the mat. In the column of “leakage amount” in FIG. 6, “no leakage” means that all the reagents have been absorbed by the mat.

As can be seen from FIG. 6, in each of Comparative Examples 1 to 4, the reagent flowed over a distance longer than 450 mm, and the reagent flowed out of the mat. On the other hand, in each of Examples 1 to 6, the reagent remained within 450 mm, and the reagent did not flow out to the outside of the mat. Particularly, in Examples 1 to 3 in which the non-woven fabric prepared by the air-through method was used for the core wrap sheet, the distance through which the reagent flowed was 138 mm or less at the longest. Was confirmed to be extremely high. In addition, Examples 4 and 5 in which the nonwoven fabric produced by the spunbond method was used for the core wrap sheet were also inferior to Examples 1 to 3, but compared to Comparative Examples 1 to 4, the absorbability of watery feces was high. It was confirmed to be high. It was also confirmed that Example 6 using a tissue for the core wrap sheet had remarkably high absorbency of watery feces as in Examples 1 to 3.

The physical properties of each material used as the core wrap sheet in the above test sample were confirmed, and the confirmation results are shown below. Whether or not watery stool stays on the surface of the core wrap sheet without flowing out from the mat depends mainly on the size of the fine opening formed by the material covering the surface of the core and the coefficient of friction of the top sheet surface. It is considered that the influence of the factors is large. Therefore, in this confirmation, two points, that is, the air permeability (air flow resistance), which is considered to have a direct correlation with the size of the opening, and the friction coefficient of the material surface, were confirmed.

<Air permeability>
In the above verification, the reagent was dropped directly onto the core wrap sheet without disposing the top sheet. However, in the present confirmation, the form closer to the actual use form, that is, the ventilation resistance of each member in the laminated portion of the top sheet and the core wrap sheet was confirmed. However, since the purpose of this confirmation is to compare the difference in airflow resistance between the core wrap sheets of Examples 1 to 6 and Comparative Examples 1 to 4, as the top sheet to be stacked on each core wrap sheet, the same type of nonwoven fabric is used. (KNT20 manufactured by RNP) was used. The ventilation resistance was measured using a ventilation tester (KES-F8-AP1) manufactured by Kato Tech Co., Ltd. FIG. 7 is a first diagram showing the measurement results of ventilation resistance. Further, FIG. 8 is a second diagram showing the measurement results of the ventilation resistance.

As can be seen from FIG. 7, in each of Examples 1 to 6, it was confirmed that the ventilation resistance of each member in the laminated portion was smaller than 0.0962 kPa·sec/m. On the other hand, in Comparative Examples 1 to 3, the ventilation resistance is 0.0962 kPa·sec/m or more. Therefore, if the liquid-permeable sheet covering the skin side of the core has a ventilation resistance of at least less than 0.0962 kPa·sec/m, watery stool attached to the surface of the top sheet will quickly spread the sheet. It can be seen that the light penetrates through and is absorbed by the absorber. Further, as can be seen from FIG. 7, it is more preferable that the liquid-permeable sheet covering the skin-side surface of the core has at least ventilation resistance of 0.0352 kPa·sec/m or less.

As can be seen from FIG. 8, the liquid-permeable sheets that cover the surface of the core on the skin side do not cause SAP leakage when the ventilation resistance is 0.0050 kPa·sec/m or more. I understand. The “SAP leak” in FIG. 8 is to close the hole connecting to the absorber with tape, have the ends in the longitudinal direction, and repeat the operation of putting the ends together or separating them in a manner of clapping three times. It was determined that there was SAP leakage when spilled over the number of grains, and no SAP leakage when spilled under 19 grains. Further, “strength” in FIG. 8 is the result of visually confirming the presence or absence of breakage after being worn by a subject having an appropriate body shape for 5 hours in accordance with the NISSEN regulations.

From this confirmation result, as in the diaper 1 of the above-described embodiment, the ventilation resistance of each member in the laminated portion of the core wrap sheet and the top sheet that covers the skin-side surface of the absorbent body is 0.0050 to 0.0962 kPa. It is recognized that the absorbent article within the range of sec/m has excellent absorbability when excreted watery feces and has practical strength, as compared with the absorbent article outside this range. ..

<Coefficient of static friction>
Next, the confirmation result of the static friction coefficient on the surface of the top sheet will be described. The static friction coefficient was measured using a surface property measuring device (Tribogear TYPE: 14DR) manufactured by Shinto Scientific Co., Ltd. The measuring method was based on JISK7125. In this confirmation, in order to verify the influence of the coefficient of static friction on the surface of the top sheet on the absorbability of aqueous feces, the static friction of Example 1 in which the absorption of aqueous feces was confirmed to be the highest in the above verification A plurality of types of topsheets having different coefficients were stacked, and the above-described liquid flow was verified in that state. FIG. 9 is a second diagram showing the test results.

Materials of the top sheet of the specimen shown in FIG. 9, in order from the left, non-woven fabric was prepared by the spunbond method: basis weight 16.0 g / ^{m 2,} was prepared by the spun bond method nonwoven basis weight: 18.0 g ^{/ m} 2, created in basis weight 22.0 g / ^{m 2,} an air-through method: the span nonwoven created by bonding method: basis weight 20.0 g / ^{m 2,} a nonwoven fabric was prepared by air-through method: basis weight 25.0 g / ^{m 2,} a nonwoven fabric was prepared by air-through method nonwoven basis weight: 20.0 g / ^{m 2,} a nonwoven fabric was prepared by air-through method: basis weight 18.0 g / ^{m 2,} a nonwoven fabric was prepared by air-through method: a basis weight 16.0 g / ^{m 2.}

As can be seen from FIG. 9, in all of the topsheets having a coefficient of static friction of 0.59 or more, the reagent remained within 450 mm and the reagent did not flow out to the outside of the mat. On the other hand, when the coefficient of static friction on the surface of the top sheet was 0.34 or less, the reagent flowed over a distance longer than 450 mm and the reagent flowed out of the mat. From this, when the coefficient of static friction of the topsheet surface is 0.59 or more, the absorbability when excretion of watery feces is higher than that of the absorbent article having the coefficient of static friction of less than 0.59. Recognized as excellent.

Moreover, although the tape-type disposable diaper is illustrated in the above-mentioned embodiment, it is also applicable to absorbent articles of other forms. Examples of such absorbent articles include various types of absorbent articles with gathers such as pants-type disposable diapers, urine pads, and light incontinence pads, and flat absorbent articles without gathers.

As can be seen from the above verification results, in the diaper 1 of the above-described embodiment, the liquid permeable sheets in the laminated portion such as the top sheet 7 and the core wrap sheet 6W interposed between the wearer and the core 6C are Since the ventilation resistance is less than 0.0962 kPa·sec/m, moisture can be quickly transferred from the wearer to the core 6C. Further, since the static friction coefficient of the surface of the top sheet 7 is 0.59 or more, the solid content contained in the watery feces is unlikely to slip on the surface of the top sheet 7. Therefore, in the diaper 1 of the above-described embodiment, the possibility of excrement leaking out when the diaper 1 is removed from the wearer can be suppressed as much as possible by improving the absorbability of watery feces. It will be possible.

Since the relationship between the coefficient of static friction on the surface of the topsheet and the feeling of wearing was measured,
The results are shown below. FIG. 10 is a table showing the results of measuring the feeling of wearing. Regarding the measurement of the feeling of wearing, by 20 panelists, about the lack of discomfort during wearing, an investigation was conducted by selecting "no discomfort" or "there is discomfort", and evaluated according to the following criteria, ◎ and ○ were passed.
◎: "No discomfort" was 16 or more and 20 or less ○: "No discomfort" was 11 or more and 15 or less △: "No discomfort" was 6 or more and 10 or less When x: When "no discomfort" is 0 or more and 5 or less

As shown in the measurement results of FIG. 10, the topsheet having a surface static friction coefficient of less than 2.52 is good, more preferably 1.91 or less, and further preferably 0.98 or less. It was confirmed.

In addition, since the verification of the core conditions was performed, the results are shown below. In the above verification, the core was pulp with a basis weight of 260 g/cm ² that does not contain SAP (horizontal width 280 mm and length 560 mm). Therefore, in the present verification, multiple samples having different basis weights were prepared, The absorbability of watery feces in each core was verified. FIG. 11 is a diagram showing the physical properties of the top sheet and the core wrap sheet used for the verification of the core. In this verification, the top sheet and the core wrap sheet having the physical properties shown in FIG. 11 were superposed on four types of cores having different amounts of pulp per unit area, and the liquid flow was verified in that state. FIG. 12 is a third diagram showing the test results.

Each core of the specimen shown in FIG. 12, the pulp amount per unit area is formed by ^{40g / m 2, 50g / m} 2, 60g / m 2, 70g / m 2 of pulp from left to right. As can be seen from FIG. 12, in all of the cores having a pulp amount of 60 g/m ² or more, the reagent remained within 450 mm in the longitudinal direction, and the reagent did not flow out to the outside of the mat. On the other hand, when the amount of pulp in the core was less than 60 g/m ² , the reagent flowed over a distance longer than 450 mm in the longitudinal direction, and the reagent flowed out of the mat. Further, in all four types, the reagents remained within 100 mm in the width direction. From this, it is recognized that when the pulp amount of the core is at least 60 g/m ² or more, excellent absorbability is exhibited when excretion of watery feces. If the core has a length of at least 500 mm or more in the longitudinal direction and a length of at least 100 mm or more in the width direction, excreted aqueous feces should not flow out of the mat. Is recognized. The length in the width direction may be 150 mm or more, and more preferably 200 mm or more in consideration of positional deviation in the width direction when worn, individual differences in the size of the buttocks of the wearer, and the like. In order to prevent the stool absorbed in the mat from coming into contact with the skin due to the gap formed between the tops of the left and right buttocks, it is effective to lengthen the width direction in this way. For example, the core may exist up to the left and right ends of the crotch region 1B of the diaper 1.

From the above verification results, the core 6C is formed of pulp having a pulp amount of 60 g/m ² or more and a length of 500 mm or more and a width of 100 mm or more, and the static friction of the surface of the top sheet 7 If the diaper 1 has a coefficient of 0.59 or more and the ventilation resistance of each member in the laminated portion where the core wrap sheet 6W and the top sheet 7 overlap is less than 0.0962 kPa·sec/m, absorbency of watery feces Is recognized to improve. Such an effect of improving the absorbability of watery feces is obtained by the moisture permeability in the laminated portion where the core wrap sheet 6W and the top sheet 7 are overlapped with each other, and the absorption performance of the watery feces in the core 6C below the laminated portion. This is due to the synergistic effect with.

1・・Diaper 1B・・Inseam area 1F・・Front body area 1R・・Back body area 2F・・Front patch 2L, 2R・・Tape 3BL, 3BR・・Three-dimensional gather 3R・・West gather 4・・Cover sheet 4KL , 4KR ··· Constriction 5 · · Backsheet 6 · · Mat 6C · · Core 6W · · Corewrap sheet 7 · · Topsheet 8 · · Sidesheet 8KL, 8KR · · Constriction 4SL, 4SR, 8EL, 8ER, 9ER ·・Thread rubber

Claims (4)

An absorbent article to be worn on the crotch of a wearer,
An absorber,
A liquid-permeable sheet covering the surface of the absorber on the wearer side,
The absorbent body has a pulp amount of 60 g/m ² or more and a size of 500 mm or more in the longitudinal direction and 100 mm or more in the width direction,
The liquid-permeable sheet,
The static friction coefficient of the surface contacting the wearer is 0.59 or more,
Part of the core wrap sheet that wraps the absorber, and has a laminated portion that overlaps the top sheet that covers the absorber wrapped in the core wrap sheet, the ventilation resistance of each member in the laminated portion. Less than 0.0962 kPa·sec/m,
Absorbent article. The liquid-permeable sheet has one or a plurality of predetermined members between the core wrap sheet and the top sheet, and the ventilation resistance of the laminated portion of the predetermined members is 0.0962 kPa·sec/m or more. small,
The absorbent article according to claim 1. The absorbent body has at least two layers, and the wearer side layer contains more particles of SAP, which is a superabsorbent polymer, than other layers.
The absorbent article according to claim 1 or 2. The absorber has two or more layers, at least one of which is a layer of SAP particles,
The absorbent article according to any one of claims 1 to 3.

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