JP7057108B2 - Absorbent article - Google Patents

Description

The present invention relates to absorbent articles such as disposable diapers.

Conventionally, one of the technical issues of absorbent articles is improvement of absorption performance of loose stool. Loose stool is an excrement that is often found especially in young children, and has a higher water content and higher fluidity than normal stool. Therefore, if the loose stool absorption performance of the diaper is insufficient, the loose stool may not be absorbed inside the diaper and may leak to the outside through the surface sheet. In addition, if the wearer's skin is in contact with loose stool for a long time, it may cause a skin irritation.

Regarding the technique for improving the absorption performance of excrement such as loose stool, the present applicant has previously proposed a non-woven fabric in which corrugated protrusions forming a plan view waveform are arranged in parallel (Patent Document 1). Further, in Patent Document 2, an absorbent article in which a three-dimensional web having an intermittent bow-shaped portion is arranged between a surface sheet and an absorber to improve the absorption performance of excrement such as loose stool is described. Have been described.

As another technique, the applicant first arranges an intermediate sheet having a two-layer structure of a high-density layer and a low-density layer between the surface sheet and the absorber to reduce the fit. We have proposed an absorbent article that is less likely to cause stuffiness and is less likely to get stuffy (Patent Document 3).

Japanese Unexamined Patent Publication No. 2014-5565 Japanese Unexamined Patent Publication No. 2010-188136 Japanese Unexamined Patent Publication No. 2008-13857

Patent Document 1 does not describe the use of a non-woven fabric in which corrugated protrusions are arranged in parallel as an intermediate sheet arranged between a surface sheet and an absorber.
Although Patent Documents 2 and 3 describe that an intermediate sheet is arranged between the surface sheet and the absorbent body, the skin of the intermediate sheet is described in any of the absorbent articles described in Patent Documents 2 and 3. No consideration is given to the texture on the facing side. When a hole is provided in the surface sheet to improve the transfer of excrement to the intermediate sheet, the intermediate sheet exposed from the hole stimulates the wearer's skin and causes skin troubles such as redness of the skin. There is concern that it will be caused.

Therefore, the present invention improves the ability to collect excrement such as loose stools without impairing the texture on the side facing the skin when the absorbent article is worn, and reduces the occurrence of skin troubles on the wearer. The purpose is to provide goods.

The present invention is an absorbent article comprising a surface sheet, an absorber, and an intermediate sheet disposed between the surface sheet and the absorber, wherein the surface sheet is open to penetrate the surface sheet. The holes are dispersed and arranged in the plane direction of the surface sheet, the surface sheet and the intermediate sheet are arranged adjacent to each other, and the average friction coefficient MIU of the skin-facing surface of the intermediate sheet is 0.25. The average deviation MMD of the friction coefficient of the skin-facing surface is 0.01 or less, and the average friction coefficient MIU of the skin-facing surface of the intermediate sheet is the average friction coefficient MIU of the skin-facing surface of the surface sheet. 90% or more and 110% or less, and the average deviation MMD of the friction coefficient of the skin-facing surface of the intermediate sheet is 90% or more and 110% or less of the average deviation MMD of the friction coefficient of the skin-facing surface of the surface sheet. It provides an absorbent article.

According to the absorbent article of the present invention, it is possible to improve the collectability of excrement such as loose stool and reduce the occurrence of skin troubles without impairing the texture when the absorbent article is worn.

FIG. 1 is a plan view schematically showing a surface facing surface of a disposable diaper, that is, a surface sheet side, which is an embodiment of the absorbent article of the present invention. It is a plan view in a state. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II-II of FIG. FIG. 3 is an enlarged cross-sectional view schematically showing a surface sheet, an intermediate sheet, and an absorber in the cross-sectional view shown in FIG. 2.

Hereinafter, the absorbent article of the present invention will be described with reference to the drawings based on the preferred embodiment thereof. 1 and 2 show a disposable diaper 1, which is an embodiment of the absorbent article of the present invention. The diaper 1 has a ventral portion 1F arranged on the ventral side of the wearer at the time of wearing, a dorsal portion 1R arranged on the dorsal side, and an inseam 1M located between them, and has an inseam from the ventral portion 1F. It extends to the dorsal side portion 1R via the portion 1M and has a vertical direction X corresponding to the front-back direction of the wearer and a lateral direction Y orthogonal to the vertical direction X. The inseam 1M is in the range of 25 to 60%, preferably 30 to 50% of the total length of the diaper 1 centering on the bisector CL when the diaper 1 is divided into two equal parts in the vertical direction X. .. Further, the inseam 1M has an excretion portion facing portion which is arranged to face both the urine excretion portion and the fecal excretion portion (anus) of the wearer when the diaper 1 is worn, and the excretion portion facing portion is usually a diaper. It is located at or near the center of 1 in the vertical direction X.

As shown in FIGS. 1 and 2, the diaper 1 has a liquid-permeable front sheet 2 that can come into contact with the wearer's skin when worn, a liquid-impermeable or impermeable back sheet 3, and both sheets 2. It includes an absorber 4 arranged between the three, and an intermediate sheet 5 arranged between the surface sheet 2 and the absorber 4. In a plan view as shown in FIG. 1, the diaper 1 has a vertically long hourglass shape in which a substantially central portion of the vertical direction X located at the inseam 1M is constricted inward and is long in one direction, that is, the vertical direction X.

In the present specification, the "skin facing surface" is a surface of the absorbent article or its constituent members (for example, the surface sheet 2) that is directed toward the skin side of the wearer when the absorbent article is worn, that is, relatively worn. The side close to the skin of the person, and the "non-skin facing surface" is the surface of the absorbent article or its constituent members that is directed to the opposite side (clothing side) to the skin side when the absorbent article is worn, that is, relative. On the side far from the wearer's skin. In addition, "when worn" here means a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained, and the absorbent article is in a state deviated from the wearing position. Does not include.

The front surface sheet 2 and the back surface sheet 3 each have a larger size than the absorber 4, and extend outward from the outer edge of the absorber 4. The surface sheet 2 will be described in detail later. The back sheet 3 forms the outer shape of the unfolded and stretched diaper 1 as shown in FIG. As the back sheet 3, various types conventionally used for this kind of absorbent article can be used without particular limitation. As the back sheet 3, for example, a resin film, a laminate of the resin film and a non-woven fabric, or the like can be used. The back surface sheet 3 has, for example, a form of a liquid-impermeable film sheet alone and a form in which an exterior sheet is laminated and arranged on a non-skin facing surface of the film sheet, that is, on the outer surface side. It is a non-woven fabric.

The absorber 4 has a long shape in the vertical direction X in a plan view as shown in FIG. 1, and extends from the ventral side portion 1F to the dorsal side portion 1R. The absorber 4 is configured to include a liquid-retaining absorbent core 40 containing an absorbent material and a core wrap sheet 41 covering the skin-facing surface and the non-skin-facing surface of the absorbent core 40. The absorbent core 40 and the core wrap sheet 41 are joined by a known joining means such as a hot melt type adhesive.

The absorbent core 40 has a single-layer structure, and in a plan view as shown in FIG. 1, it has an hourglass shape in which a substantially central portion in the longitudinal direction, that is, the longitudinal direction X is constricted inward. The absorbent core 40 is made by stacking core-forming materials including an absorbent material. As the absorbent material, those usually used as a material for forming this kind of absorbent core can be used without particular limitation, for example, hydrophilic fibers such as wood pulp and synthetic fiber treated with a hydrophilic agent, and water absorption. Examples include sex polymer particles. That is, the absorbent core 40 may be a laminated fiber of hydrophilic fibers, or a laminated fiber in which water-absorbing polymer particles are supported. As the core wrap sheet 41, a water-permeable sheet material can be used, and for example, paper, non-woven fabric, or the like can be used.

The intermediate sheet 5 is a separate body from the absorber 4, is arranged adjacent to the surface sheet 2, and is also called a sub-layer or a second sheet. The intermediate sheet 5 has a rectangular shape in a plan view as shown in FIG. The intermediate sheet 5 preferably covers 30 to 70% of the skin-facing surface of the absorber 4, and more preferably 40 to 60%, with its longitudinal direction coincided with the vertical direction X. preferable. The intermediate sheet 5 is arranged so as to be located at the inseam 1M in the diaper 1. The length (width) of the intermediate sheet 5 in the lateral direction Y is the same as or shorter than that of the absorber 4. As described above, the inseam 1M has an excretion portion facing portion, and the intermediate sheet 5 is preferably arranged so as to be located at least at the excretion portion facing portion. The intermediate sheet 5 and each of the surface sheet 2 and the absorber 4 (core wrap sheet 41) are fully or partially bonded by a known bonding means such as an adhesive. The intermediate sheet 5 will be described in detail later.

Side sheets 6 are arranged on both the left and right sides of the surface sheet 2 along the vertical direction X. The side sheet 6 has an inner edge portion along the vertical direction X and an outer edge portion located outside the inner edge portion in the horizontal direction Y and along the vertical direction X, and has a plane as shown in FIG. Visually, the inner edge portion overlaps with the absorber 4, and the outer edge portion extends outward in the lateral direction Y from the side edge of the absorber 4 along the vertical direction X, as shown in FIG. 2, a back surface sheet. It is joined with 3. The side seat 6 and the back seat 3 in the left and right leg portions arranged around the wearer's legs are fixed in an extended state along the thread-like elastic member 60 in the vertical direction X, whereby the diaper is fixed. A pair of leg gathers are formed on the leg portion when the 1 is worn due to the contraction of the elastic member 60. Further, a thread-like elastic member 61 is fixed to the inner edge of the side sheet 6 in an extended state along the vertical direction X, whereby when the diaper 1 is worn, the elastic member 61 contracts and at least the lower part of the crotch is 1M. In the side sheet 6, the inner edge side of the side sheet 6 stands up toward the wearer's skin side from the joint portion with the back surface sheet 3 to form a leak-proof cuff. This leak-proof cuff can prevent so-called lateral leakage of excrement liquid such as urine to the outside in the lateral direction Y. The front surface sheet 2, the back surface sheet 3, the absorber 4, the intermediate sheet 5, the side sheets 6, and the elastic members 60, 61 are bonded to each other by a known bonding means such as a hot melt type adhesive.

The diaper 1 is a so-called deployable disposable diaper, and as shown in FIG. 1, a pair of fastening tapes 7 and 7 are provided on both side edges of the dorsal portion 1R of the diaper 1 along the vertical direction X. .. A fastening portion (not shown) made of a male member of a mechanical hook-and-loop fastener is attached to the fastening tape 7. Further, a landing region 8 made of a female member of a mechanical hook-and-loop fastener is formed on the non-skin facing surface of the ventral side portion 1F of the diaper 1. In the adhered region 8, a female member of a mechanical hook-and-loop fastener is attached to the non-skin facing surface of the back surface sheet 3 forming the non-skin facing surface of the ventral side 1F by a known joining means such as an adhesive or a heat seal. It is formed by joining and fixing, and the fastening portion of the fastening tape 7 can be detachably fastened.

Next, the above-mentioned surface sheet 2 and intermediate sheet 5 will be described in detail with reference to FIGS. 1 and 2 in addition to FIG. FIG. 3 shows a cross-sectional view of the surface sheet 2, the intermediate sheet 5, and the absorber 4 of the diaper 1.

As shown in FIG. 1, the surface sheet 2 has a plurality of openings 2h penetrating the surface sheet 2. The holes 2h may be provided in the entire area of the surface sheet 2, but in the diaper 1, they are provided in the inseam 1M of the surface sheet 2. In this way, the surface sheet 2 is provided with an opening 2h, and the intermediate sheet 5 is arranged adjacent to the surface sheet 2. Therefore, in the diaper 1, the skin-facing surface of the intermediate sheet 5 is formed through the opening 2h. You can see it. As described above, the inseam 1M has an excretion portion facing portion, and in the diaper 1, the opening 2h is provided so as to be located at the excretion portion facing portion. As described above, the excretion section facing portion has the stool excretion section facing portion 2R arranged to face the stool excretion section of the wearer on the dorsal side 1R side of the excretion section facing portion. It is preferable that the opening 2h is provided only in the stool excretion portion facing portion 2R in the surface sheet 2. By providing the opening 2h only in the fecal excretion portion facing portion 2R, for example, excrement such as loose stool can be efficiently collected from the opening 2h, and the collected excrement other than the fecal excrement portion facing portion 2R can be efficiently collected. It is possible to suppress the return of liquid from the site.

The openings 2h may be dispersed in the plane direction of the surface sheet 2, but in the diaper 1, the openings 2h are evenly dispersed in the plane direction of the surface sheet 2. Specifically, a row of openings in which a plurality of openings 2h are connected in series along the horizontal direction Y at regular intervals are arranged at regular intervals in the vertical direction X. Then, in the diaper 1, one opening row is formed and another opening row 2h forming another opening row adjacent to the one opening row is formed between the opening rows 2h and 2h adjacent to each other in the lateral direction Y. The openings 2h are arranged in a staggered arrangement so that

When the surface sheet 2 is viewed in a plan view, the area ratio of the opening 2h in the inseam 1M ((total area of the opening 2h / area of the inseam 1M) × 100) is the absorption performance of excrement such as loose stool. From the viewpoint of improvement, 5% or more is preferable, 10% or more is more preferable, 40% or less is preferable, 30% or less is more preferable, and specifically, 5% or more and 40% or less is preferable, and 10% or more is preferable. 30% or less is more preferable.

From the same viewpoint, the area per opening 2h formed in the lower crotch 1M is preferably 0.2 mm ² or more, more preferably 5 mm ² or more, and 35 mm ² when the surface sheet 2 is viewed in a plan view. The following is preferable, 20 mm ² or less is more preferable, 0.2 mm ² or more and 35 mm ² or less is preferable, and 5 mm ² or more and 20 mm ² or less is more preferable.

The shape of the opening 2h is not particularly limited, but in the diaper 1, the surface sheet 2 is formed in a substantially circular shape in a plan view. From the same viewpoint, the diameter of the substantially circular opening 2h is preferably 0.5 mm or more, more preferably 2.5 mm or more, preferably 7 mm or less, more preferably 5 mm or less, and preferably 0.5 mm or more and 7 mm or less. , 2.5 mm or more and 5 mm or less is more preferable.

The basis weight of the surface sheet 2 is preferably 20 g / m ² or more, more preferably 30 g / m ² or more, preferably 60 g / m ² or less, more preferably 50 g / m ² or less, and 20 g / m ² or more and 60 g / m. ² or less is preferable, and 30 g / m ² or more and 50 g / m ² or less is more preferable. The basis weight of the surface sheet 2 is a value measured in a state excluding the opening 2h.

The surface sheet 2 preferably has an average friction coefficient MIU of 0.25 or less, preferably 0.2, from the viewpoint of imparting sufficient slipperiness to the skin-facing surface of the surface sheet 2. The following is more preferable. As the lower limit of the average friction coefficient MIU of the surface facing the skin of the surface sheet 2, the closer it is to 0, the easier it is to slip, which is preferable, but from the viewpoint of manufacturing, it is about 0.05. The average friction coefficient MIU of the surface facing the skin of the surface sheet 2 is measured by the following measuring method.

The surface sheet 2 preferably has an average deviation MMD of the friction coefficient of the skin facing surface of 0.01 or less, preferably 0.008, from the viewpoint of imparting sufficient smoothness to the skin facing surface of the surface sheet 2. The following is more preferable. The lower limit of the average deviation MMD of the friction coefficient of the surface sheet 2 is closer to 0, the smoother it is without roughness, but it is about 0.003 from the viewpoint of manufacturing. The average deviation MMD of the friction coefficient of the surface sheet 2 is measured by the following measuring method.

[Measurement method of average friction coefficient MIU and average deviation MMD of friction coefficient]
Using a KES-FB4 surface tester (manufactured by Kato Tech Co., Ltd.), the contactor was placed on a product test piece containing the surface sheet 2 under a load of 5 kPa (50 gf / cm ² ) with a contactor. Move 3 cm horizontally at a constant speed of 1 cm / sec. The friction coefficient of the moving region and the average deviation of the friction coefficient are measured at three points in the vertical direction, and the average value is taken as the average friction coefficient MIU of the surface sheet 2 and the average deviation MMD of the friction coefficient. The average friction coefficient MIU of the surface sheet 2 and the average deviation MMD of the friction coefficient are measured in a state where the surface sheet 2 is incorporated in the absorbent article. In the above-mentioned product test piece, the absorbing portion in which the absorber 4 and the intermediate sheet 5 are present in the absorbent article is cut out as the front surface sheet 2 and the back surface sheet 3 to obtain a test piece. The average friction coefficient MIU of the surface sheet 2 and the average deviation MMD of the friction coefficient are measured by applying a contact to the skin-facing surface of the surface sheet 2.

Further, the surface sheet 2 has a compression characteristic value of 7.0 ((gf / cm ² ) / mm) at the time of a minute load from the viewpoint of imparting a sufficient fluffy feeling to the surface sheet 2 and improving the texture. ) Or less, more preferably 5.0 ((gf / cm ² ) / m) or less. As the lower limit of the compression characteristic value of the surface sheet 2 under a minute load, the closer it is to 0, the more preferable, but from the viewpoint of manufacturing, it is about 1.0 ((gf / cm ² ) / m). .. In this specification, the compression characteristic value at the time of a minute load under the environment of 22 ° C. and 65% RH is defined as the characteristic value indicating the touch. The compression characteristic value of the surface sheet 2 under a minute load is measured by the following measuring method.

[Measurement method of compression characteristic value under minute load]
The data that is the basis for calculating the compression characteristic value under a small load is measured using KES FB3-AUTO-A (trade name) manufactured by Kato Tech Co., Ltd. in a 22 ° C. 65% RH environment. Specifically, three surface sheets 2 are cut into 20 cm × 20 cm to prepare a measurement sample. Next, one of the measurement samples is placed on the test table. Next, compression is performed between the steel plates of a circular plane having an area of 2 cm ² . The compression speed is 20 μm / sec, the maximum compression load is 10 gf / cm ² , and the recovery process is also measured at the same speed. At this time, the amount of displacement between the steel plates is x (mm), the load is y (gf / cm ² ), the position of the point where the load is detected is x = 0, and the measurement is performed in the compression direction. The value of x increases as it is compressed.

The compression characteristic value at the time of a minute load is calculated by extracting the amount of deformation of the thickness at the time of a minute load from the measured data (x, y). Specifically, the data of the load between 0.30 gf / cm ² and 1.00 gf / cm ² and the amount of deformation at that time are extracted for the first time, which is not the recovery process, and the relationship between x and y. The approximate straight line is obtained by the least squares method, and the slope at that time is used as the above characteristic value (unit (gf / cm ² ) / mm). Measure at 3 points with one measurement sample. A total of 9 points are measured for 3 samples. The characteristic values of each of the nine locations are calculated, and the average value thereof is used as the compression characteristic value of the nonwoven fabric under a minute load.

In the diaper 1, the surface sheet 2 is entirely composed of a non-woven fabric formed of synthetic fibers. The fiber density (book / mm ² ) of the fibers of the surface sheet 2 is preferably 20 / mm ² or more, preferably 30 / mm ² or more, from the viewpoint of smoothly drawing the loose stool excreted by the wearer into the intermediate sheet 5. More preferably, 100 lines / mm ² or less, 90 lines / mm ² or less is more preferable, 20 lines / mm ² or more and 100 lines / mm ² or less is preferable, and 30 lines / mm ² or more and 90 lines / mm ² or less is preferable. More preferred. The fiber density of the fiber of the surface sheet 2 is measured by the following measuring method.

[Measurement method of fiber density]
The cut surface of the surface sheet 2 is magnified and observed using a scanning electron microscope (magnification (150 to 500 times) that can measure about 30 to 60 fiber cross sections. Next, per fixed area (about 0.5 mm ² ). ), The number of cross sections of the fiber cut by the cut surface is measured, and the area of the visual field portion where the ^number of fiber cross sections is measured is obtained. (Book / mm ² ). The measurement is performed at three points, and the fiber density of the sample is averaged. For the scanning electron microscope, for example, JCM-5100 (trade name) manufactured by Nippon Denshi Co., Ltd. is used. Can be used.

The surface sheet 2 has a contact angle of fibers constituting the skin facing surface from the viewpoint of improving the attraction of excrement such as urine to the intermediate sheet 5 side and reducing the liquid residue of the excrement on the skin facing surface. It is preferably higher than the contact angle of the fibers constituting the non-skin facing surface. Specifically, the contact angle of the fibers constituting the skin facing surface of the surface sheet 2 is preferably 80 degrees or more, more preferably 82 degrees or more, preferably 87 degrees or less, more preferably 85 degrees or less, and more preferably 80 degrees or more. 87 degrees or less is preferable, and 82 degrees or more and 85 degrees or less are more preferable. The contact angle of the fibers constituting the non-skin facing surface of the surface sheet 2 is preferably 75 degrees or more, more preferably 77 degrees or more, preferably 82 degrees or less, more preferably 80 degrees or less, and 75 degrees or more and 82 degrees or less. It is preferable, and more preferably 77 degrees or more and 80 degrees or less.

[Measuring method of fiber contact angle]
For the measurement of the contact angle, for example, a contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Specifically, after dropping ion-exchanged water (about 20 picolitres) on the surface of the constituent fibers, the contact angle is immediately measured using the contact angle meter. The measurement is performed at five or more points where the constituent fibers are different, and the average value thereof is taken as the contact angle. The measurement environment temperature is 20 ° C.

Examples of the surface sheet 2 having the above-mentioned physical properties include a non-woven fabric manufactured by the card method, an air-through non-woven fabric, a spunbonded non-woven fabric, and a melt-blown non-woven fabric containing a heat-sealing synthetic resin such as polyethylene, polyethylene terephthalate, and polypropylene. , Various non-woven fabrics such as spunlaced non-woven fabric and needle punched non-woven fabric; films made liquid permeable by opening means and the like can be used. As the surface sheet 2, it is preferable to use an air-through non-woven fabric or a spunbonded non-woven fabric, and it is more preferable to use an air-through non-woven fabric, from the viewpoint of making it easier for loose stool to permeate without impairing the texture of the surface facing the skin.

Next, the intermediate sheet 5 may be composed of one member, or may be formed by laminating two or more members in a bonded state or a non-bonded state. When the intermediate sheet 5 is formed of two or more members, the physical properties of each member can be easily different, and the intermediate sheet 5 having desired characteristics as a whole can be easily configured.

The intermediate sheet 5 has the same smoothness as the surface sheet 2 on the skin-facing surface of the intermediate sheet 5 that can be seen through the opening 2h of the surface sheet 2, and the skin of the surface sheet 2 is described above. Ratio of the average friction coefficient MIU of the skin-facing surface of the intermediate sheet 5 to the average friction coefficient MIU of the facing surface ((average friction coefficient MIU of the skin-facing surface of the intermediate sheet 5 / the average friction coefficient MIU of the skin-facing surface of the surface sheet 2) ) × 100) is preferably 90% or more, more preferably 95% or more, preferably 110% or less, more preferably 105% or less, and specifically. , 90% or more and 110% or less, and more preferably 95% or more and 105% or less. The average friction coefficient MIU of the skin-facing surface of the intermediate sheet 5 is measured by the same method as the method for measuring the average friction coefficient MIU of the skin-facing surface of the surface sheet 2 described above.

The intermediate sheet 5 has an average friction coefficient of the skin-facing surface from the viewpoint of imparting the same sufficient slipperiness as the surface sheet 2 to the skin-facing surface of the intermediate sheet 5 that can be seen through the opening 2h of the surface sheet 2. The MIU is preferably 0.25 or less, more preferably 0.2 or less, at least in the portion exposed from the opening 2h. As the lower limit of the average friction coefficient MIU of the surface facing the skin, the closer it is to 0, the easier it is to slip, which is preferable, but from the viewpoint of manufacturing, it is about 0.05.

Further, the intermediate sheet 5 gives the same smoothness as the surface sheet 2 to the skin-facing surface of the intermediate sheet 5 that can be seen through the opening 2h of the surface sheet 2, and the skin of the surface sheet 2 described above is described above. Ratio of the average deviation MMD of the friction coefficient of the skin facing surface of the intermediate sheet 5 to the average deviation MMD of the friction coefficient of the facing surface ((average deviation MMD of the friction coefficient of the skin facing surface of the intermediate sheet 5 / skin facing surface sheet 2) The average deviation of the coefficient of friction of the surface MMD) × 100) is preferably 90% or more, more preferably 95% or more, preferably 110% or less, and more preferably 105% or less. It is preferably 90% or more and 110% or less, and more preferably 95% or more and 105% or less. The average deviation MMD of the friction coefficient of the skin-facing surface of the intermediate sheet 5 is measured by the same method as the above-mentioned method for measuring the average deviation MMD of the friction coefficient of the skin-facing surface of the surface sheet 2.

The intermediate sheet 5 has an average coefficient of friction of the skin-facing surface from the viewpoint of imparting sufficient smoothness similar to that of the surface sheet 2 to the skin-facing surface of the intermediate sheet 5 that can be seen through the opening 2h of the surface sheet 2. The deviation MMD is preferably 0.01 or less, preferably 0.008 or less, at least in the portion exposed from the opening 2h. The lower limit of the average deviation MMD of the coefficient of friction of the surface facing the skin of the intermediate sheet 5 is closer to 0, the smoother it is without roughness, but it is about 0.003 from the viewpoint of manufacturing.

Further, the intermediate sheet 5 has a compression characteristic value of 7.0 ((gf / cm ² ) / mm) at the time of a minute load from the viewpoint of imparting a sufficient fluffy feeling to the intermediate sheet 5 and improving the texture. ) Or less, more preferably 5.0 ((gf / cm ² ) / mm) or less. As the lower limit of the compression characteristic value of the intermediate sheet 5 at the time of a minute load, the closer it is to 0, the more preferable, but from the viewpoint of manufacturing, it is about 1.0 ((gf / cm ² ) / mm). .. The compression characteristic value of the intermediate sheet 5 under a minute load is measured by the same method as the above-mentioned method for measuring the compression characteristic value of the surface sheet 2.

In the diaper 1, the intermediate sheet 5 is entirely composed of a non-woven fabric formed of synthetic fibers. As shown in FIG. 3, the intermediate sheet 5 has a two-layer structure having a high-density layer 51 and a low-density layer 52 having a fiber density lower than that of the high-density layer 51, as shown in FIG. The high-density layer 51 is located on the non-skin facing surface side, and the low-density layer 52 is located on the skin facing surface side. That is, in the intermediate sheet 5, the fiber density of the fibers on the non-skin facing surface side is higher than the fiber density of the fibers on the skin facing surface side. By making the fiber density of the fiber on the non-skin facing surface side of the intermediate sheet 5 higher than the fiber density of the fiber on the skin facing surface side, the loose stool transferred from the surface sheet 2 is smoothly transferred to the absorber 4 by the capillary force of the fiber. It can be pulled in.

The difference between the fiber density of the fibers forming the high-density layer 51 of the intermediate sheet 5 (book / mm ² ) and the fiber density of the fibers forming the low-density layer 52 (book / mm ² ) is from the surface sheet 2. From the viewpoint of smoothly drawing the transferred loose stool into the absorber 4, the number is preferably 150 / mm ² or more, more preferably 200 / mm ² or more, and 450 / mm ² or less. It is preferably 400 lines / mm ² or less, 150 lines / mm ² or more and 450 lines / mm ² or less, and 200 lines / mm ² or more and 400 lines / mm ² or less. Is more preferable. The fiber density of the fiber of the intermediate sheet 5 is measured by the same method as the method for measuring the fiber density of the fiber of the surface sheet 2 described above.

From the same viewpoint, the fiber density (lines / mm ² ) of the fibers forming the high-density layer 51 is preferably 250 lines / mm ² or more, more preferably 300 lines / mm ² or more, and 500 lines / mm ² or less. Preferably, 450 lines / mm ² or less is more preferable, 250 lines / mm ² or more and 500 lines / mm ² or less is preferable, and 300 lines / mm ² or more and 450 lines / mm ² or less is more preferable.

From the same viewpoint, the fiber density (line / mm ² ) of the fibers forming the low density layer 52 is preferably 30 lines / mm ² or more, more preferably 50 lines / mm ² or more, and 130 lines / mm ² or less. Preferably, 100 lines / mm ² or less is more preferable, 30 lines / mm ² or more and 130 lines / mm ² or less is preferable, and 50 lines / mm ² or more and 100 lines / mm ² or less is more preferable.

The total basis weight of the intermediate sheet 5 is preferably higher than the basis weight of the surface sheet 2 from the viewpoint of reducing the inhibition of lateral diffusion of loose stool inside the intermediate sheet 5 when loaded. Specifically, the ratio of the total basis weight of the intermediate sheet 5 to the basis weight of the surface sheet 2 (total basis weight of the intermediate sheet 5 / basis weight of the surface sheet 2) is preferably 1.2 or more. 5.5 or more is more preferable, 3.0 or less is preferable, 2.0 or less is more preferable, 1.2 or more and 3.0 or less is preferable, and 1.5 or more and 2.0 or less is more preferable. More specifically, the total basis weight of the intermediate sheet 5 is preferably 30 g / m ² or more, more preferably 40 g / m ² or more, preferably 70 g / m ² or less, and more preferably 60 g / m ² or less. It is preferably 30 g / m ² or more and 70 g / m ² or less, and more preferably 40 g / m ² or more and 60 g / m ² or less.

The intermediate sheet 5 has a contact angle of fibers constituting the skin facing surface from the viewpoint of improving the attraction of excrement such as loose stool to the absorber 4 side and reducing the liquid residue of the excrement on the surface sheet 2 side. Is preferably higher than the contact angle of the fibers constituting the non-skin facing surface. From the same viewpoint, it is preferable that the contact angle of the fibers constituting the skin facing surface of the intermediate sheet 5 is lower than the contact angle of the fibers constituting the non-skin facing surface of the surface sheet 2. In general, in the diaper 1, the contact angle of the fibers constituting the skin facing surface of the intermediate sheet 5 is higher than the contact angle of the fibers constituting the non-skin facing surface of the intermediate sheet 5, and constitutes the non-skin facing surface of the surface sheet 2. The contact angle of the fibers is higher than the contact angle of the fibers constituting the skin facing surface of the intermediate sheet 5, and the contact angle of the fibers constituting the skin facing surface of the surface sheet 2 constitutes the non-skin facing surface of the surface sheet 2. It is preferably higher than the contact angle of.

Specifically, the contact angle of the fibers constituting the skin facing surface of the intermediate sheet 5 is preferably 60 degrees or more, more preferably 63 degrees or more, preferably 75 degrees or less, more preferably 72 degrees or less, and more preferably 60 degrees or more. It is preferably 75 degrees or less, and more preferably 63 degrees or more and 72 degrees or less. The contact angle of the fibers constituting the non-skin facing surface of the intermediate sheet 5 is preferably 55 degrees or more, more preferably 58 degrees or more, preferably 70 degrees or less, more preferably 67 degrees or less, and 55 degrees or more and 70 degrees or less. It is preferable, and more preferably 58 degrees or more and 67 degrees or less. The contact angle of the fibers constituting the intermediate sheet 5 is measured by the same method as the method for measuring the contact angle of the fibers constituting the surface sheet 2 described above.

Examples of the intermediate sheet 5 having the above-mentioned physical properties include an air-through nonwoven fabric, a heat-rolled nonwoven fabric, a spunbonded nonwoven fabric, and a spunbond (S) -containing a heat-sealing synthetic resin such as polyethylene, polyethylene terephthalate, and polypropylene. Melt blown (M) -spunbond (S) non-woven fabric, SMMS non-woven fabric, resin bond non-woven fabric, needle punch non-woven fabric, spunlace non-woven fabric, and air-laid non-woven fabric can be used. As the intermediate sheet, it is preferable to use an air-through non-woven fabric.

As a method for manufacturing an intermediate sheet 5 made of an air-through nonwoven fabric having the above-mentioned physical characteristics, for example, a web is formed by dropping and depositing fibers placed in an air flow on a net, and the net is relative to the web on the net. There is a method of performing web coupling by penetrating high temperature air or high pressure water flow from the side opposite to the surface side. The characteristics of non-woven fabrics manufactured using a net are the net surface of any non-woven fabric that was in contact with the net (arranged on the net) at the time of manufacture, and high-temperature air or high pressure that was not in contact with the net surface. It has a surface (air surface) opposite to the net surface to which a water stream is directly applied. In the non-woven fabric having a net surface and an air surface, the fiber density is higher on the net surface than on the air surface. Then, the temperature of the high temperature air, the pressure of the high pressure water flow, the moving speed of the web, and the like are adjusted so that the average friction coefficient MIU of the air surface of the obtained non-woven fabric and the average deviation MMD of the friction coefficient become desired values. In this way, the intermediate sheet 5 having a two-layer structure having the high-density layer 51 and the low-density layer 52 can be manufactured.

In the diaper 1 of the present embodiment, the holes 2h penetrating the surface sheet 2 are arranged in the surface sheet 2 in a dispersed manner in the plane direction of the surface sheet 2. Therefore, the collectability of excrement such as loose stool from the surface sheet 2 to the absorber 4 is improved. The average friction coefficient MIU of the skin-facing surface of the intermediate sheet 5 is 0.25 or less, the average deviation MMD of the friction coefficient is 0.01 or less, and the average friction coefficient MIU of the skin-facing surface of the intermediate sheet 5 is the surface. The average coefficient of friction of the skin-facing surface of the sheet 2 is 90% or more and 110% or less of MIU, and the average deviation MMD of the friction coefficient of the skin-facing surface of the intermediate sheet 5 is the average deviation of the friction coefficient of the skin-facing surface of the surface sheet 2. It is 90% or more and 110% or less of MMD. Therefore, the skin-facing surface of the intermediate sheet 5 is also provided with a sufficient texture as in the skin-facing surface of the surface sheet 2, and the intermediate sheet 5 that can be seen through the opening 2h when the diaper 1 is worn touches the wearer's skin. It is hard to irritate and it is hard to cause skin troubles such as redness of the skin.

Although the absorbent article of the present invention has been described above based on the preferred embodiment, the absorbent article of the present invention can be variously modified without being limited to the embodiment.
For example, although the above-mentioned diaper 1 uses the surface sheet 2 having a one-layer structure, it may be a surface sheet having a two-layer structure. When the two-layer structure surface sheet 2 is used, the fiber density of the fibers on the skin facing surface side of the surface sheet 2 is made lower than the fiber density of the fibers on the non-skin facing surface side of the surface sheet 2, and further. The fiber density of the fibers on the non-skin facing surface side of the surface sheet 2 may be lower than the fiber density of the fibers on the non-skin facing surface side of the intermediate sheet 5. By setting the fiber density composition of the fibers of the surface sheet 2 and the intermediate sheet 5 as described above, excrement such as loose stool and urine excreted by the wearer is more smoothly drawn into the absorber 4 by the capillary force of the fibers. Can be made.

Further, in the above-mentioned diaper 1, the region where the skin facing surface of the intermediate sheet 5 is exposed from the opening 2h of the surface sheet 2 is arranged in the inseam 1M, but is intermediate with the region having the opening 2h of the surface sheet 2. As long as it overlaps with the sheet 5, it may be other than the inseam 1M.

Further, the absorbent article of the present invention is not limited to the above-mentioned expandable disposable diaper, and broadly includes articles used for absorbing body fluids (urine, loose stool, menstrual blood, etc.) discharged from the human body, and is a pants type. Disposable diapers, menstrual napkins, menstrual shorts, etc. are also included.

With respect to the embodiments described above, the present invention further discloses the following absorbent articles:
<1>
An absorbent article comprising a surface sheet, an absorber, and an intermediate sheet disposed between the surface sheet and the absorber, wherein the surface sheet has holes that penetrate the surface sheet. The surface sheet and the intermediate sheet are arranged adjacent to each other in a dispersed manner in the plane direction of the sheet, and the average friction coefficient MIU of the skin-facing surface of the intermediate sheet is 0.25 or less. Moreover, the average deviation MMD of the friction coefficient of the skin-facing surface is 0.01 or less, and the average friction coefficient MIU of the skin-facing surface of the intermediate sheet is 90% or more of the average friction coefficient MIU of the skin-facing surface of the surface sheet. An absorbent article, which is 110% or less, and the average deviation MMD of the friction coefficient of the skin-facing surface of the intermediate sheet is 90% or more and 110% or less of the average deviation MMD of the friction coefficient of the skin-facing surface of the surface sheet.
<2>
The compression characteristic value of the surface sheet under a minute load is 7 (gf / cm ² ) / mm or less, and the compression characteristic value of the intermediate sheet under a minute load is 7 (gf / cm ² ) / mm or less. The absorbent article according to <1>.
<3>
The absorbent article according to <1> or <2>, wherein the fiber density of the fiber on the non-skin facing surface side of the intermediate sheet is higher than the fiber density of the fiber on the skin facing surface side of the intermediate sheet.
<4>
The above-mentioned <1> to <3>, wherein the contact angle of the fibers constituting the skin-facing surface of the intermediate sheet is higher than the contact angle of the fibers constituting the non-skin-facing surface of the intermediate sheet. Absorbent article.
<5>
The above-mentioned <1> to <4>, wherein the surface sheet and the intermediate sheet are non-woven fabrics made of synthetic fibers, and the basis weight of the intermediate sheet is higher than the basis weight of the surface sheet. Absorbent article.
<6>
The absorbent article according to any one of <1> to <5>, wherein the opening of the surface sheet is provided in a portion facing the stool excretion portion arranged so as to face the stool excretion portion of the wearer.
<7>
The absorbent article according to any one of <1> to <6>, wherein the surface sheet is made of an air-through nonwoven fabric.
<8>
It has a ventral portion arranged on the ventral side of the wearer at the time of wearing, a dorsal portion arranged on the dorsal side, and a crotch portion located between them, and the dorsal portion from the ventral side portion via the crotch portion. The intermediate sheet has a vertical direction extending to the side and corresponding to the front-rear direction of the wearer and a horizontal direction orthogonal to the vertical direction, and the intermediate sheet has its longitudinal direction aligned with the vertical direction so that the absorber faces the skin. The absorbent article according to any one of <1> to <7>, which covers 30 to 70% of the surface.
<9>
It has a ventral portion arranged on the ventral side of the wearer at the time of wearing, a dorsal portion arranged on the dorsal side, and a crotch portion located between them, and the dorsal portion from the ventral side portion via the crotch portion. It has a vertical direction extending to the side and corresponding to the front-back direction of the wearer and a lateral direction orthogonal to the vertical direction, and the intermediate sheet is arranged so as to be located at the lower crotch and has a length in the lateral direction. The absorbent article according to any one of <1> to <8>, wherein the length is the same as or shorter than the lateral length of the absorber.
<10>
In the intermediate sheet, the ratio of the average friction coefficient MIU of the skin-facing surface of the intermediate sheet to the average friction coefficient MIU of the skin-facing surface of the surface sheet ((average friction coefficient MIU of the skin-facing surface of the intermediate sheet MIU / the surface sheet). The average coefficient of friction MIU) × 100) on the surface facing the skin is more preferably 95% or more, preferably 110% or less, and more preferably 105% or less. The absorbent article according to any one of <9>.
<11>
In the intermediate sheet, the average friction coefficient MIU of the skin-facing surface is preferably 0.25 or less, more preferably 0.2 or less, at least in the portion exposed from the opening, and the skin-facing surface is more preferably. The absorbent article according to any one of <1> to <10>, wherein the lower limit of the average friction coefficient MIU is preferably 0.05 or more.
<12>
Ratio of the average deviation MMD of the friction coefficient of the skin-facing surface of the intermediate sheet to the average deviation MMD of the friction coefficient of the skin-facing surface of the surface sheet ((average deviation MMD of the friction coefficient of the skin-facing surface of the intermediate sheet / the surface). The average deviation of the coefficient of friction of the surface of the sheet facing the skin MMD) × 100) is preferably 90% or more, more preferably 95% or more, preferably 110% or less, and 105% or less. The absorbent article according to any one of <1> to <11>, more preferably present.
<13>
In the intermediate sheet, the average deviation MMD of the coefficient of friction of the surface facing the skin is preferably 0.01 or less, more preferably 0.008 or less, and more preferably facing the skin, at least in the portion exposed from the opening. The absorbent article according to any one of <1> to <12>, wherein the lower limit of the average deviation MMD of the friction coefficient of the surface is preferably 0.003 or more.
<14>
The intermediate sheet preferably has a compression characteristic value of 7.0 ((gf / cm ² ) / mm) or less, and 5.0 ((gf / cm ² ) / mm) or less. The absorbent article according to any one of <1> to <13>, wherein the amount is more preferably 1.0 ((gf / cm ² ) / mm) or more, and the lower limit is preferably 1.0 ((gf / cm 2) / mm) or more.
<15>
The intermediate sheet has a high-density layer and a low-density layer having a fiber density lower than that of the high-density layer, and the fiber density (book / mm ² ) of the fibers forming the high-density layer and the low-density layer are combined. The difference from the fiber density (lines / mm ² ) of the formed fibers is preferably 150 fibers / mm ² or more, more preferably 200 fibers / mm ² or more, and 450 fibers / mm ² or less. The absorbent article according to any one of <1> to <14>, preferably 400 pieces / mm ² or less.
<16>
The intermediate sheet has a high-density layer and a low-density layer having a fiber density lower than that of the high-density layer, and the fiber density (book / mm ² ) of the fibers forming the high-density layer is 250 lines / mm ² . The absorbency according to any one of <1> to <15>, wherein the above is preferable, 300 lines / mm ² or more is more preferable, 500 lines / mm ² or less is preferable, and 450 lines / mm ² or less is more preferable. Goods.
<17>
The intermediate sheet has a high-density layer and a low-density layer having a fiber density lower than that of the high-density layer, and the fiber density (book / mm ² ) of the fibers forming the low-density layer is 30 lines / mm ² . The absorbency according to any one of <1> to <16>, wherein 50 lines / mm ² or more is more preferable, 130 lines / mm ² or less is preferable, and 100 lines / mm ² or less is more preferable. Goods.
<18>
The ratio of the total basis weight of the intermediate sheet to the basis weight of the surface sheet (total basis weight of the intermediate sheet / basis weight of the surface sheet) is preferably 1.2 or more, more preferably 1.5 or more. The absorbent article according to any one of <1> to <17>, preferably 3.0 or less, more preferably 2.0 or less.
<19>
The contact angle of the fibers constituting the skin-facing surface of the intermediate sheet is preferably 60 degrees or more, more preferably 63 degrees or more, preferably 75 degrees or less, more preferably 72 degrees or less, and the non-skin facing surface of the intermediate sheet 5. The contact angle of the fibers constituting the surface is preferably 55 degrees or more, more preferably 58 degrees or more, preferably 70 degrees or less, and more preferably 67 degrees or less, according to any one of <1> to <18>. Absorbent article.
<20>
The absorption according to any one of <1> to <19>, wherein the opening is preferably provided only in the stool excretion portion facing portion which is arranged to face the stool excretion portion of the wearer in the surface sheet. Sex goods.
<21>
It has a ventral portion arranged on the ventral side of the wearer at the time of wearing, a dorsal portion arranged on the dorsal side, and a crotch portion located between them, and the dorsal portion from the ventral side portion via the crotch portion. A row of openings extending to the side and having a vertical direction corresponding to the front-back direction of the wearer and a lateral direction orthogonal to the vertical direction, and a plurality of the openings in series along the lateral direction at regular intervals are formed. The absorbent article according to any one of <1> to <20>, which is arranged at regular intervals in the vertical direction.
<22>
The opening is such that the opening forming one opening row and another opening row adjacent to the one opening row is located between the openings adjacent to each other in the lateral direction. The absorbent article according to <21>, wherein the holes are arranged in a staggered arrangement.
<23>
It has a ventral portion arranged on the ventral side of the wearer at the time of wearing, a dorsal portion arranged on the dorsal side, and a crotch portion located between them. The area ratio of the holes ((total area of the holes / area of the inseam) × 100) is preferably 5% or more, more preferably 10% or more, and preferably 40% or less, preferably 30%. The absorbent article according to any one of <1> to <22>, wherein the following is more preferable.
<24>
It has a ventral portion arranged on the ventral side of the wearer at the time of wearing, a dorsal portion arranged on the dorsal side, and a crotch portion located between them. The area per opening formed is preferably 0.2 mm ² or more, more preferably 5 mm ² or more, preferably 35 mm ² or less, and more preferably 20 mm ² or less, said <1> to <23>. The absorbent article according to any one of.
<25>
The openings are substantially circular, and the diameter of the substantially circular openings is preferably 0.5 mm or more, more preferably 2.5 mm or more, preferably 7 mm or less, and more preferably 5 mm or less. The absorbent article according to any one of <24>.
<26>
The surface sheet preferably has an average friction coefficient MIU of 0.25 or less, more preferably 0.2 or less, and the lower limit value of the average friction coefficient MIU of the skin facing surface is set as a lower limit value. The absorbent article according to any one of <1> to <25>, preferably 0.05 or more.
<27>
In the surface sheet, the average deviation MMD of the friction coefficient of the surface facing the skin is preferably 0.01 or less, more preferably 0.008 or less, and the lower limit of the average deviation MMD of the friction coefficient is 0. The absorbent article according to any one of <1> to <26>, preferably .003 or more.
<28>
The surface sheet preferably has a compression characteristic value of 7.0 ((gf / cm ² ) / mm) or less, and 5.0 ((gf / cm ² ) / mm) or less. The absorbent article according to any one of <1> to <27>, wherein the amount is more preferably 1.0 ((gf / cm ² ) / mm) or more, and the lower limit is preferably 1.0 ((gf / cm 2) / mm) or more.
<29>
The fiber density of the fibers on the non-skin facing surface side of the surface sheet is lower than the fiber density of the fibers on the non-skin facing surface side of the surface sheet, and the fiber density of the fibers on the non-skin facing surface side of the surface sheet is the intermediate sheet. The absorbent article according to any one of <1> to <28>, which is lower than the fiber density of the fiber on the non-skin facing surface side.
<30>
The contact angle of the fibers constituting the skin facing surface of the intermediate sheet is higher than the contact angle of the fibers constituting the non-skin facing surface of the intermediate sheet, and the contact angle of the fibers constituting the non-skin facing surface of the surface sheet is higher. The contact angle of the fibers constituting the skin facing surface of the intermediate sheet is higher than the contact angle of the fibers constituting the skin facing surface of the surface sheet, and the contact angle of the fibers constituting the skin facing surface of the surface sheet is higher than the contact angle of the fibers constituting the non-skin facing surface of the surface sheet. The high absorbent article according to any one of <1> to <29>.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[Example 1]
A disposable diaper having the same configuration as the diaper 1 shown in FIGS. 1 and 2 having the surface sheet 2 and the intermediate sheet 5 shown in FIG. 3 was manufactured. As the surface sheet, fibers containing polyethylene resin placed in an air flow are dropped and deposited on the net to form a web, and the web on the net moving at a speed of 100 m / s is viewed from the side opposite to the net surface side. A sheet was used in which an air-through non-woven fabric produced by penetrating air at 135 ° C. at a wind speed of 1 m / s was opened by piercing a pin. Further, as the intermediate sheet, a web is formed by dropping and depositing fibers containing polyethylene resin placed in an air stream on the net, and the web on the net moving at a speed of 80 m / s is opposite to the net surface side. An air-through non-woven fabric manufactured by penetrating air at 131 ° C. from the side at a wind speed of 1.5 m / s was used, and the net-side surface of the manufactured air-through non-woven fabric was used as the non-skin facing surface side. The physical characteristics of the surface sheet and the intermediate sheet are shown in Table 1 below.
The average friction coefficient MIU, the average deviation MMD of the friction coefficient, the compression characteristic value at the time of a minute load, the fiber density and the contact angle of the fiber were measured by the same method as the above-mentioned measuring method.

[Example 2]
An intermediate sheet in which the contact angle of the fibers on the surface facing the skin is higher than the contact angle of the fibers on the non-skin facing surface and the total basis weight is higher than the basis weight of the surface sheet. A disposable diaper having the same configuration as that of Example 1 was manufactured except that an intermediate sheet was used.

[Comparative Example 1]
The average friction coefficient MIU of the skin facing surface is larger than 0.25, the ratio of the average friction coefficient MIU to the average friction coefficient MIU of the surface sheet is larger than 110%, and the fiber density on the skin facing surface side is the fiber on the non-skin facing surface side. An intermediate sheet having a higher density and a lower contact angle of the fibers on the skin-facing surface than the contact angle of the fibers on the non-skin-facing surface. A surface sheet having a compression characteristic value of more than 7 (gf / cm ² ) / mm and having the same configuration as the disposable diaper of Example 1 except that the surface sheet having the physical properties shown in Table 1 below was used. Manufactured disposable diapers. As the surface sheet, fibers containing polyethylene resin placed in an air flow are dropped and deposited on the net to form a web, and the web on the net moving at a speed of 100 m / s is viewed from the side opposite to the net surface side. An air-through non-woven fabric produced by penetrating air at 131 ° C. at a wind speed of 2 m / s was used. Further, as the intermediate sheet, a web is formed by dropping and depositing fibers containing polyethylene resin placed in an air flow on the net, and the side opposite to the net surface side with respect to the web on the net moving at a speed of 50 m / s. An air-through non-woven fabric produced by passing air at 131 ° C. through a wind speed of 1 m / s was used.

[Evaluation of texture]
A texture evaluation test was conducted on the skin-facing surfaces of the disposable diapers of Example 1, Example 2, and Comparative Example 1 using 20 women as monitors. The items of the texture evaluation test include the softness, smoothness, and touch of the portion where the opening 2h of the surface sheet 2 and the intermediate sheet 5 overlap, and each item is scored according to the following evaluation criteria, and each item is scored. The average score of was calculated. Then, the overall average score was further calculated from the average score of each item, and the average score was used as the evaluation of the texture. The results are shown in Table 1.
5 points: Good 4 points: Somewhat good 3 points: Usually 2 points: Somewhat bad 1 point: Bad

[Evaluation of loose stool WB amount]
Regarding the disposable diapers of Example 1, Example 2 and Comparative Example 1, the diapers are spread out in a plane and placed horizontally so that the skin facing surface side (surface sheet 2 side) faces upward, and the diapers are vertically placed. After injecting 10 g of pseudo loose stool at a time with a metering pump at a flow rate of 6 g / sec to a site 30 mm away from the center C in the direction X (a site corresponding to the portion facing the stool excretion portion 2R in FIG. 1), the injection position. A non-permeable resin film was layered on the diaper, and a weight was placed on the resin film to pressurize the injection position at 3 kPa for 1 minute. This pressure of "3 kPa" assumes the pressure (pressure resistance) applied to the dorsal portion 1R of the diaper 1 when the young child wearing the diaper 1 is lying on his back. The pseudo-loose stool used was a suspension prepared by dissolving or dispersing bentonite in water, and had a viscosity of 40 mPa · s and a bentonite concentration of 15% by mass. After the pressure treatment, the weight and the resin film were removed, and the weight of the pseudo loose stool attached to the film was measured. Three measurement samples were prepared for each diaper to be measured, and the above measurements were performed for each of them, and the average value of these measured values was taken as the loose stool WB amount (g) of the diaper 1. The smaller the amount of loose stool WB (g), the better the absorption of loose stool and the higher the evaluation. The results are shown in Table 1.

As shown in Table 1, when the evaluation of the texture of the disposable diapers of Examples 1 and 2 and the evaluation of the texture of the disposable diapers of Comparative Example 1 are compared, the disposable diapers of Examples 1 and 2 are the disposable diapers of Comparative Example 1. It was found that the texture of the skin contact surface was better than that of diapers.
Further, when the amount of loose stool WB (g) of the disposable diapers of Examples 1 and 2 is compared with the amount of loose stool WB (g) of Comparative Example 1, the disposable diapers of Examples 1 and 2 are the disposable diapers of Comparative Example 1. In comparison, it was found that the amount of loose stool WB was low.
From this, the disposable diapers of Examples 1 and 2 can improve the collection of excrement such as loose stools without impairing the texture when the diaper is worn, as compared with the disposable diapers of Comparative Example 1. , It can be expected that the occurrence of skin troubles of the wearer can be reduced.

1 Disposable diaper 2 Front sheet 2R Stool excretion part facing part 2h Opening 3 Back side sheet 4 Absorbent 40 Absorbent core 41 Core wrap sheet 5 Intermediate sheet 51 High density layer 52 Low density layer X Vertical direction Y Horizontal direction

Claims (7)

An absorbent article comprising a surface sheet, an absorber, and an intermediate sheet disposed between the surface sheet and the absorber.
The surface sheet and the intermediate sheet are non-woven fabrics made of synthetic fibers.
In the surface sheet, openings penetrating the surface sheet are dispersed and arranged in the plane direction of the surface sheet.
The surface sheet and the intermediate sheet are arranged adjacent to each other.
The basis weight of the intermediate sheet is higher than the basis weight of the surface sheet.
The total basis weight of the intermediate sheet / the basis weight of the surface sheet is 1.2 or more and 2.0 or less.
The basis weight of the surface sheet is 30 g / m ² or more and 50 g / m ² or less.
The basis weight of the intermediate sheet is 40 g / m ² or more and 70 g / m ² or less.
The fiber density of the fibers on the non-skin facing surface side of the surface sheet is lower than the fiber density of the fibers on the non-skin facing surface side of the surface sheet, and the fiber density of the fibers on the non-skin facing surface side of the surface sheet is the intermediate sheet. Lower than the fiber density of the fibers on the non-skin facing surface side,
The average friction coefficient MIU of the skin-facing surface of the intermediate sheet is 0.25 or less, and the average deviation MMD of the friction coefficient of the skin-facing surface is 0.01 or less.
The average friction coefficient MIU of the skin-facing surface of the intermediate sheet is 95% or more and 110% or less of the average friction coefficient MIU of the skin-facing surface of the surface sheet.
An absorbent article in which the average deviation MMD of the friction coefficient of the skin-facing surface of the intermediate sheet is 95% or more and 105% or less of the average deviation MMD of the friction coefficient of the skin-facing surface of the surface sheet. An absorbent article comprising a surface sheet, an absorber, and an intermediate sheet disposed between the surface sheet and the absorber.
The surface sheet and the intermediate sheet are non-woven fabrics made of synthetic fibers.
In the surface sheet, openings penetrating the surface sheet are dispersed and arranged in the plane direction of the surface sheet.
The surface sheet and the intermediate sheet are arranged adjacent to each other.
The basis weight of the intermediate sheet is higher than the basis weight of the surface sheet.
The total basis weight of the intermediate sheet / the basis weight of the surface sheet is 1.2 or more and 2.0 or less.
The basis weight of the surface sheet is 30 g / m ² or more and 50 g / m ² or less.
The basis weight of the intermediate sheet is 40 g / m ² or more and 70 g / m ² or less.
The fiber density of the fibers on the non-skin facing surface side of the surface sheet is lower than the fiber density of the fibers on the non-skin facing surface side of the surface sheet, and the fiber density of the fibers on the non-skin facing surface side of the surface sheet is the intermediate sheet. Lower than the fiber density of the fibers on the non-skin facing surface side,
The average friction coefficient MIU of the skin-facing surface of the intermediate sheet is 0.25 or less, and the average deviation MMD of the friction coefficient of the skin-facing surface is 0.01 or less.
The average friction coefficient MIU of the skin-facing surface of the intermediate sheet is 96% or more and 109% or less of the average friction coefficient MIU of the skin-facing surface of the surface sheet.
An absorbent article in which the average deviation MMD of the friction coefficient of the skin-facing surface of the intermediate sheet is 97% or more and 105% or less of the average deviation MMD of the friction coefficient of the skin-facing surface of the surface sheet. The compression characteristic value of the surface sheet under a minute load is 7 (gf / cm ² ) / mm or less, and the compression characteristic value of the intermediate sheet under a minute load is 7 (gf / cm ² ) / mm or less. The absorbent article according to claim 1 or 2. The absorbent article according to any one of claims 1 to 3, wherein the fiber density of the fiber on the non-skin facing surface side of the intermediate sheet is higher than the fiber density of the fiber on the skin facing surface side of the intermediate sheet. The contact angle of the fibers constituting the skin facing surface of the intermediate sheet is higher than the contact angle of the fibers constituting the non-skin facing surface of the intermediate sheet, and the contact of the fibers constituting the non-skin facing surface of the surface sheet is higher. The angle is higher than the contact angle of the fibers constituting the skin facing surface of the intermediate sheet, and the contact angle of the fibers constituting the skin facing surface of the surface sheet is the contact angle of the fibers constituting the non-skin facing surface of the surface sheet. The absorbent article according to any one of claims 1 to 4, which is higher than the contact angle . The absorbent article according to any one of claims 1 to 5, wherein the opening of the surface sheet is provided in a portion facing the stool excretion portion arranged so as to face the stool excretion portion of the wearer. The absorbent article according to any one of claims 1 to 6, wherein the surface sheet is made of an air-through nonwoven fabric.

Images