JP7087237B2 - Absorbent article - Google Patents

Description

The present invention relates to a thin absorbent article in which gel blocking is less likely to occur when body fluid such as urine is repeatedly excreted, and a decrease in absorption rate is satisfactorily suppressed.

Generally, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the top sheet and the back sheet, whereby urine and the like can be treated. The body fluid is absorbed by the absorber through the top sheet. Absorbent articles include those having various absorption amounts depending on the amount of body fluid discharged under the assumed usage conditions. Of these, the light incontinence pad is known as one that absorbs a relatively small amount of urine. Here, when wearing the light incontinence pad, if the wearer is in a pants style such as jeans, the light incontinence pad may be conspicuous in appearance.

Here, it was common to use fluff pulp and a superabsorbent polymer (also referred to as Super Absorbent Polymer, SAP) in combination for the absorbents constituting these absorbent articles, but mainly for the purpose of thinning. A so-called superabsorbent sheet (also referred to as a SAP sheet), which is composed of a non-woven fabric as a substrate and a superabsorbent polymer and does not contain fluff pulp, may be used as an absorber, and has an absorbent sheet provided with a highly absorbent sheet. Goods are also being considered.

As such an absorbent article, for example, in Patent Document 1, a liquid-permeable or impermeable first sheet, a liquid-permeable second sheet, and an interposition between the first and second sheets are provided. Moreover, it has a liquid absorbing region including a liquid absorbing core fixed to the inner surface of at least one of the two sheets, the liquid absorbing core contains highly absorbent polymer particles, and the liquid absorbing region is lateral. It has a central recess located in the central part in the direction and both sides of the central recess located laterally and thicker than the central recess, and the mass per unit area of the highly absorbent polymer particles on both sides. Disclosed are absorbent articles comprising a highly absorbent sheet characterized in that the amount is higher than that of the central recess.

Japanese Unexamined Patent Publication No. 2013-146459

Since the absorbent article described in Patent Document 1 uses a highly absorbent sheet that does not contain fluff pulp as an absorber, it is possible to reduce the thickness, and the wearing feeling and absorption speed have been studied. However, in the highly absorbent sheet, due to the high density of the highly absorbent polymer, in the case of repeated use, the absorption rate may be slowed down due to so-called gel blocking, and the absorbability may be lowered. Therefore, the present invention has been made in view of the above problems, and is a thin absorbent article in which gel blocking is unlikely to occur when body fluids such as urine are repeatedly excreted, and a decrease in absorption rate is satisfactorily suppressed. The purpose is to provide.

The inventors of the present invention conducted diligent research in view of the above problems, and as a result, raised a part of the substrate nonwoven fabric constituting the highly absorbent sheet and placed the highly absorbent polymer in a predetermined position. As a result, it was found that the above problems could be solved, and the present invention was completed. Specifically, the present invention provides the following.

(1) The first aspect of the present invention is an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the top sheet and the back sheet. The absorber is a highly absorbent sheet in which a highly absorbent polymer is arranged between the upper-layer substrate nonwoven fabric and the lower-layer substrate nonwoven fabric, and the absorber has a body-side surface of the lower-layer substrate nonwoven fabric in a plan view. The raised region is divided into a raised region and a non-brushed region on which the body-side surface of the lower substrate nonwoven fabric is not raised. The raised region has a substantially band shape continuous in the longitudinal direction, and a plurality of the raised regions are provided. The raised regions are separated from each other in the width direction, the highly absorbent polymer is arranged only in the non-woven fabric, and the widthwise dimension of the raised regions is 10 mm or more and 20 mm or less. It is an article.

(2) The second aspect of the present invention is the absorbent article according to (1), wherein one of the plurality of raised regions is provided at a substantially central portion in the width direction of the absorber. The feature is that the widthwise dimension of the raised region provided at the substantially central portion in the width direction is larger than the widthwise dimension of the other raised region.

(3) The third aspect of the present invention is the absorbent article according to (1) or (2), wherein a plurality of heat seals are applied to the upper-layer substrate nonwoven fabric and the lower-layer substrate nonwoven fabric along the width direction. The heat seals are formed at substantially equal intervals in the longitudinal direction, and the upper layer substrate nonwoven fabric and the lower substrate nonwoven fabric are the heat seals at the sites where the heat seals are formed. It is characterized by being joined by a non-woven fabric.

(4) A fourth aspect of the present invention is the absorbent article according to any one of (1) to (3), wherein the lower layer substrate nonwoven fabric is an air-through nonwoven fabric, and the basis weight of the lower substrate nonwoven fabric. Is 20 g / m ² or more and 300 g / m ² or less, and the thickness is 2 mm or more and 10 mm or less.

(5) A fifth aspect of the present invention is the absorbent article according to any one of (1) to (4), wherein the absorbent article is placed between the absorbent body and the back sheet. It is characterized by having a second absorber comprising a fluff pulp and a highly absorbent polymer.

In the absorbent article of the present invention, the absorber is a highly absorbent sheet in which a highly absorbent polymer is arranged between the upper substrate nonwoven fabric and the lower substrate nonwoven fabric, and the absorber is the body side of the lower substrate nonwoven fabric in a plan view. It is divided into a brushed area where the surface is brushed and a non-brushed area where the body side surface of the lower substrate nonwoven fabric is not brushed. Since the raised areas are separated from each other in the width direction and the highly absorbent polymer is arranged only in the non-woven area, gel blocking is less likely to occur when body fluid such as urine is repeatedly excreted, and the absorption rate is reduced. It is possible to provide a thin absorbent article in which is well suppressed.

It is a top view of the absorbent article of this invention. FIG. ₁ is a cross-sectional view taken along the line X1 _- X1 of FIG. It is a perspective view of the absorber used in this invention which shows the aspect which the heat seal is formed on the substrate nonwoven fabric.

<Absorbable article>
The absorbent article 1 according to the embodiment of the present invention is exemplified by a light incontinence pad, but the absorbent article 1 of the present invention is not limited to this, and is not limited to this, and is a light incontinence liner, a menstrual napkin, and a urine collector. It may be a pad or other absorbent article. FIG. 1 is a plan view of the absorbent article 1 of the present invention, and FIG. 2 is a cross-sectional view of the absorbent article 1 of the present invention (X1 _- X1 sectional view of FIG. ₁ ). As shown in FIG. 1, the absorbent article 1 has a liquid-permeable top sheet 10 arranged on the body side surface and a liquid-impermeable back sheet arranged on the clothing side surface facing the top sheet 10. 30 and an absorber 20 arranged between the top sheet 10 and the back sheet 30 are provided, whereby the absorber 20 has a structure sandwiched between the top sheet 10 and the back sheet 30. There is. In the description of the present specification, the longitudinal direction of the absorbent article 1 and each member is a direction extending in front of and behind the wearer when the absorbent article 1 is worn, and is a direction indicated by reference numeral Y in the drawing. .. Further, the width direction of the absorbent article 1 and each member is a direction laterally or orthogonal to the longitudinal direction, and is a direction indicated by reference numeral X in the drawing. Further, in the present specification, the body-side surface is the surface of the front and back surfaces of each member such as the absorber 20 that is arranged on the wearer's skin side at the time of wearing, and the clothing-side surface is the absorber 20. Of the front and back surfaces of each member such as the above, the surface is directed to the side opposite to the wearer's skin side when worn. The length of the absorbent article 1 is preferably 150 mm or more and 300 mm or less, and the width direction is preferably 50 mm or more and 150 mm or less.

〔Absorber〕
As shown in FIG. 2, the absorber 20 is a highly absorbent sheet in which a highly absorbent polymer is arranged between the upper substrate nonwoven fabric 210 and the lower substrate nonwoven fabric 211. As described above, since the absorber 20 does not contain fluff pulp, a thin absorbent article 1 can be obtained. Further, it is preferable that the length dimension of the absorber 20 is 140 mm or more and 290 mm or less, the width direction dimension is 40 mm or more and 140 mm or less, and the thickness is 3 mm or more and 11 mm or less.

Further, as shown in FIGS. 1 and 2, in the absorber 20, the raised region 20A on which the body-side surface of the lower-layer substrate nonwoven fabric 211 is raised and the body-side surface of the lower-layer substrate nonwoven fabric 211 are not raised in plan view. It is divided into a non-brushed region 20B, and the raised region 20A has a substantially band shape continuous in the longitudinal direction, a plurality of raised regions 20A are provided, and the raised regions 20A are separated from each other in the width direction, and are highly absorbent polymers. Has a structure that is located only in the non-brushed region 20B. Here, in the conventional high-absorbency sheet, since the high-absorbency polymer is present at a high density in the entire high-absorbency sheet, so-called gel blocking is likely to occur when body fluid such as urine is repeatedly excreted. As a result, the absorption rate may be slowed down and the absorbability may be lowered. In the absorbent body 20 used in the absorbent article 1 of the present invention, since the highly absorbent polymer is arranged only in the non-raised region 20B, the density of the highly absorbent polymer as a whole of the absorbent body 20 is the conventional high absorbent property. It tends to be lower than that of the sheet, and further, in the raised region 20A, the interfiber voids of the lower base substrate non-woven fabric 211 increase as compared with the case where the raised region 20A is not raised, so that urine or the like reaches the clothing side of the absorber 20. Body fluids can be widely diffused and permeated. That is, in the absorber 20, the raised region 20A responsible for the diffusion and permeation of body fluid such as urine and the non-raised region 20B on which the highly absorbent polymer is arranged and mainly responsible for absorption are configured in a well-balanced manner. Even when body fluids such as these are repeatedly excreted, gel blocking is unlikely to occur, and a decrease in absorption rate can be satisfactorily suppressed.

(Brushed area)
The number of substantially band-shaped raised regions 20A continuous in the longitudinal direction is not particularly limited, but is preferably 3 or more and 7 or less. By setting the number of raised regions 20A within the above range, body fluids such as urine can be easily diffused and permeated, and even when body fluids such as urine are repeatedly excreted, gel blocking is unlikely to occur and the absorption rate is reduced well. Can be suppressed.

The width direction dimension of the raised region 20A is preferably 10 mm or more and 20 mm or less, preferably 15 mm or more and 20 mm or less, and the longitudinal dimension of the raised region 20A is preferably 140 mm or more and 290 mm or less. By setting the width and longitudinal dimensions of the raised region 20A to the above ranges, gel blocking is unlikely to occur even when body fluids such as urine are repeatedly excreted, and a decrease in absorption rate can be satisfactorily suppressed. can. Further, in this case, one of the plurality of raised regions 20A is provided in the substantially central portion in the width direction of the absorber 20, and the raised region 20A provided in the substantially central portion in the width direction is provided in the width direction. It is preferable that the dimension is larger than the dimension in the width direction of the other raised region 20A. In general, since the substantially central portion in the width direction of the absorber 20 is the urination region, one of the raised regions 20A is provided in the substantially central portion in the width direction of the absorber 20 and in the substantially central portion in the width direction. By making the widthwise dimension of the provided raised region 20A larger than the widthwise dimension of the other raised region 20A, the diffusion and penetration of body fluids such as urine are more effectively improved, and gel blocking is further improved. It can be difficult to wake up. In this embodiment, the number of raised regions 20A is preferably an odd number from the viewpoint of balance.

Further, the distance between adjacent raised regions 20A in the width direction (dimensions in the width direction of the non-raised region 20B located between the adjacent raised regions 20A) is preferably 10 mm or more and 40 mm or less, preferably 20 mm or more and 30 mm. The following is more preferable. By setting the distance between adjacent raised regions 20A in the width direction (dimension in the width direction of the non-raised region 20B located between the adjacent raised regions 20A) within the above range, the raised region of body fluid such as urine. It is possible to improve the balance between diffusion and penetration by 20A and absorption by a highly absorbent polymer in the non-raised region 20B, and prevent a decrease in absorption rate due to gel blocking when body fluid such as urine is repeatedly excreted. can.

(Base non-woven fabric)
In the absorber 20, the upper-layer base non-woven fabric 210 and the lower-layer base non-woven fabric 211 are used as the base non-woven fabric. Examples of these substrate non-woven fabrics include non-woven fabrics such as air-through non-woven fabrics, point-bonded non-woven fabrics, spunbond non-woven fabrics, and melt-blow non-woven fabrics, and composite non-woven fabrics obtained by laminating spunbond non-woven fabrics / melt-blow non-woven fabrics and spunbond non-woven fabrics / melt-blow non-woven fabrics / spunbond non-woven fabrics. be able to. Of these non-woven fabrics, it is preferable to use an air-through non-woven fabric that is easy to obtain bulkiness. In particular, since the lower substrate nonwoven fabric 211 is raised in the raised region 20A, it is preferable to use a bulky air-through nonwoven fabric. Examples of the method for raising the body-side surface of the lower-layer substrate nonwoven fabric 211 in the raised region 20A include a rotary saw blade and a needle punch, and a method of raising fluff with a rotary saw blade is used from the viewpoint of in-line productivity and cost. Is preferable.

The thickness of the upper substrate nonwoven fabric 210 is preferably 1 mm or more and 5 mm or less, and the basis weight of the upper substrate nonwoven fabric 210 is preferably 20 g / m ² or more and 50 g / m ² or less. Further, since the thickness of the lower substrate nonwoven fabric 211 is likely to be thicker than that of the upper substrate nonwoven fabric 210 because there is a raised portion, it is preferably 2 mm or more and 10 mm or less, and the basis weight of the lower substrate nonwoven fabric 211 is 20 g / g. It is preferably m ² or more and 300 g / m ² or less.

(Highly absorbent polymer)
The highly absorbent polymer is not particularly limited as long as it can absorb urine and prevent backflow, and is composed of sodium polyacrylate, polyasparagitate, (starch-acrylic acid) graft copolymer, and the like. A polymer formed from a material such as a (acrylic acid-vinyl alcohol) copolymer, a (isobutylene-maleic anhydride) copolymer and a saponified product thereof can be used. Among these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight. The basis weight of the highly absorbent polymer in the non-raised region 20B is preferably 10 g / m ² or more and 400 g / m ^{2 or less, and 30 g / m 2 or more and 350 g / m 2 or less} in order to ensure absorption performance. Is more preferable.

In addition, by avoiding fine powder with poor fluidity as a powder, the basic performance regarding absorption is improved, and from the viewpoint of reducing the rugged tactile sensation generated by the hardening of the highly absorbent sheet, high absorbency is achieved. The medium particle size of the polymer is preferably 50 μm or more and 600 μm or less, and more preferably 100 μm or more and 500 μm or less.

The highly absorbent polymer may be fixed between the upper substrate nonwoven fabric 210 and the lower substrate nonwoven fabric 211 in the non-raised region 20B by a hot melt adhesive. In this case, the content of the hot melt adhesive is preferably 10 g / m ² or less so as not to impair the absorbability of the highly absorbent polymer and not to impair the feel when worn. The hot melt adhesive is a synthetic rubber-based or ethylene-vinyl acetate copolymer having a melting point of 100 ° C. or higher and 180 ° C. or lower, such as a styrene-butadiene-styrene-based copolymer or a styrene-isoprene-styrene-based copolymer. Styrene-based hot melt adhesives such as the above can be used. As a method for applying the hot melt adhesive, known methods such as a curtain coat method in which the hot melt adhesive in a molten state is applied from a nozzle in a non-contact manner, a spiral method, and a slot method in which the hot melt adhesive is applied by a contact method can be used.

Here, if the highly absorbent polymer is fixed with a hot melt adhesive, the density tends to be high, so gel blocking is less likely to occur, and the highly absorbent polymer is fixed with a hot melt adhesive in order to prevent a decrease in the absorption rate. It is preferable not to do so. When the highly absorbent polymer is not fixed with the hot melt adhesive, the highly absorbent polymer flows in the longitudinal direction when the wearer wears the absorbent article 1 and acts, and the highly absorbent polymer tends to be unevenly distributed. .. Therefore, when the highly absorbent polymer is not fixed with the hot melt adhesive, as shown in FIG. 3, a plurality of heat seals 212 are formed on the upper substrate nonwoven fabric 210 and the lower substrate nonwoven fabric 211 along the width direction. It is preferable that the upper substrate nonwoven fabric 210 and the lower substrate nonwoven fabric 211 are bonded by the heat seal 212 at the portion where the heat seal 212 is formed. By forming the heat seal 212 in such an embodiment, the fluidity of the highly absorbent polymer in the longitudinal direction can be reduced, the uneven distribution of the highly absorbent polymer is suppressed, and the absorbency of the absorber 20 is suppressed. Can be stabilized. Further, the heat seals 212 are preferably formed at substantially equal intervals in the longitudinal direction, and the number of heat seals 212 is preferably 3 or more and 10 or less, and each heat seal 212 is preferably formed. The distance between them is preferably 5 mm or more and 100 mm or less.

(Hydrophilic sheet)
Further, although not shown, the absorber 20 may have a hydrophilic sheet that encloses the entire highly absorbent sheet. By wrapping the entire high-absorbent sheet with a hydrophilic sheet, it is possible to prevent the high-absorbent polymer from leaking to the outside of the absorbent body 20, and it is possible to improve the feel when worn. Examples of the hydrophilic sheet include hydrophilic non-woven fabrics such as tissues, absorbent papers, spunbonded non-woven fabrics and air-laid non-woven fabrics. From the viewpoint of availability and cost, it is preferable to use hydrophilic non-woven fabrics or tissues. The basis weight is preferably 7 g / m ² or more and 45 g / m ² or less, and more preferably 8 g / m ² or more and 15 / m ² or less. When wrapping the entire high-absorbent sheet with a hydrophilic sheet, it is preferable to fix the high-absorbent sheet and the hydrophilic sheet by hot melt adhesive or heat embossing.

[Top sheet]
The top sheet 10 allows the body fluid to quickly pass toward the absorber 20, and is arranged so as to face the back sheet 30 with the absorber 20 interposed therebetween. Since the top sheet 10 is a sheet that comes into contact with the skin, it has a soft feel and does not irritate the skin. It is a hydrophilic non-woven fabric, an open film such as an open polyethylene film, and foamed urethane foam. It is formed from a film or a composite sheet in which these are laminated. The top sheet 10 may be a single layer or a plurality of layers may be laminated, and a large number of through holes may be formed in order to impart dry touch.

Further, as the hydrophilic non-woven fabric having the above-mentioned properties, synthetic fibers such as polypropylene and polyethylene, recycled fibers such as rayon, and natural fibers such as cotton are used, and the thermal bond method, air-through method, spunlace method, etc. are used. Those obtained by a known processing method such as a spunbond method can be used.

The basis weight of the top sheet 10 is preferably 15 g / m ² or more and 40 g / m ² or less from the viewpoint of workability and strength. A lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizer, or the like may be applied to the top sheet 10 in order to reduce irritation to the skin.

[Backsheet]
The back sheet 30 used in the present invention is liquid impermeable and uses a sheet material having water impermeability, but may have moisture permeability to prevent stuffiness. Examples of the material of the back sheet 30 having such characteristics include a thin plastic sheet such as a polyethylene sheet or a polyethylene laminated non-woven fabric. Further, the basis weight of the back sheet 30 is preferably 15 g / m ² or more and 60 g / m ² or less from the viewpoint of workability and strength.

Although not shown, the surface of the back sheet 30 on the clothing side may be provided with an adhesive layer for fixing the absorbent article 1 to underwear or the like when worn. Further, when the absorbent article 1 has a pressure-sensitive adhesive layer, it may have a release sheet for protecting the pressure-sensitive adhesive layer, and this release sheet is partially bonded to the packaging sheet of the absorbent article 1. May be.

[Three-dimensional gather]
Three-dimensional gathers may be provided on the body-side surface of the absorbent article 1. This three-dimensional gather forms a space for confining the body fluid together with the top sheet 10, and can prevent the leakage of the body fluid. The three-dimensional gather preferably includes a three-dimensional gather sheet and an elastic elastic member arranged along a free end portion of the three-dimensional gather sheet. As the stretchable elastic member, a thread-shaped, string-shaped, or flat-shaped member made of natural rubber, synthetic rubber, polyurethane, or the like can be appropriately used.

[Second absorber]
The absorbent article 1 of the present invention may have a second absorbent (not shown) provided with fluff pulp and a highly absorbent polymer between the absorbent 20 and the backsheet 30. Here, the second absorber is preferably made of fluff pulp and a highly absorbent polymer. The basis weight of the second absorber is preferably 50 g / m ² or more and 700 g / m ² or less. As the fluff pulp used for the second absorber, either softwood pulp (NBKP) or hardwood pulp (LBKP) can be used, or they can be mixed and used. The second absorber is preferably wrapped in a hydrophilic sheet.

<Manufacturing method of absorbent articles>
The method for producing the absorbent article 1 is not particularly limited, and a conventionally known method can be adopted. For example, if necessary, a three-dimensional gather is arranged in advance on the top sheet 10 and then the raised region 20A is formed. The absorber 20 divided into the non-raised region 20B is sandwiched between the top sheet 10 and the back sheet 30, and the top sheet 10 and the back sheet 30 are partially or completely covered with a hot melt adhesive or heat. It can be manufactured by fixing with embossing, ultrasonic embossing, high frequency embossing, or the like. Then, after individually packaging this in a package, it may be folded in three in the longitudinal direction and folded.

Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the above embodiments, and various changes or improvements may be made to the above embodiments. It is clear to those skilled in the art that is possible. It is also clear from the description of the claims that the form with such changes or improvements may be included in the technical scope of the present invention.

<Examples 1 to 5, Comparative Examples 1 to 3>
The following absorbers were prepared, and the absorption rate was measured assuming that body fluids such as urine were repeatedly excreted.

[Example 1]
Air-through non-woven fabrics are prepared as the upper-layer base non-woven fabric (basis weight 20 g / m ² ) and the lower-layer base non-woven fabric (basis weight 50 g / m ² ), and a part of the body-side surface of the lower-layer base non-woven fabric is physically brushed with a saw blade. , A brushed region and a non-raised region, and in the non-raised region, a highly absorbent polymer (basis weight 250 g / m ² ) is evenly arranged between the upper substrate nonwoven fabric and the lower substrate nonwoven fabric, and 125 mm in the width direction. , An absorber having a length of 250 mm was obtained. The raised regions were formed in a substantially band shape continuous in the longitudinal direction, and three raised regions were provided so that the raised regions were separated from each other in the width direction. The lengthwise dimension of each raised region was adjusted to 220 mm, and the widthwise dimension was adjusted to 10 mm. One of the three raised regions is provided in the central portion in the width direction of the absorber, and the distance between adjacent raised regions in the width direction (dimension in the width direction of the non-raised region located between the adjacent raised regions). ) Was adjusted to 20 mm. The highly absorbent polymer was not fixed with a hot melt adhesive.

[Example 2]
Except for the point that the width direction dimension of each raised region is 15 mm and the widthwise separation distance between adjacent raised regions (the width dimension of the non-raised region located between the adjacent raised regions) is 10 mm. The absorber of Example 2 was obtained by the same method as in Example 1.

[Example 3]
The absorber of Example 3 was obtained by the same method as in Example 1 except that the dimension in the width direction of each raised region was set to 15 mm.

[Example 4]
Except for the point that the width direction dimension of each raised region is 15 mm and the widthwise separation distance between adjacent raised regions (the width dimension of the non-raised region located between the adjacent raised regions) is 30 mm. The absorber of Example 4 was obtained by the same method as in Example 1.

[Example 5]
The absorber of Example 5 was obtained by the same method as in Example 1 except that the dimension in the width direction of each raised region was set to 20 mm.

[Comparative Example 1]
Example 1 except that the absorber is not provided with a raised region and the highly absorbent polymer (basis weight 250 g / m ² ) is arranged evenly between the upper substrate nonwoven fabric and the lower substrate nonwoven fabric. The absorber of Comparative Example 1 was obtained by the same method as in the above.

[Comparative Example 2]
An absorber of Comparative Example 2 was obtained by the same method as in Example 1 except that the dimension in the width direction of each raised region was set to 5 mm.

[Comparative Example 3]
The absorbent body is not provided with a raised region, and the highly absorbent polymer (basis weight 250 g / m ² ) is arranged evenly between the upper substrate nonwoven fabric and the lower substrate nonwoven fabric, and further, the highly absorbent polymer is placed. An absorber of Comparative Example 3 was obtained by the same method as in Example 1 except that it was fixed with a hot melt adhesive.

[Evaluation of absorption rate]
For the absorbers of each Example and each Comparative Example thus obtained, the absorption rate at the time of repeated absorption was evaluated by the following method. Prepare a columnar measuring jig with a hole with an inner diameter of 30 mm in the center, an outer diameter of 80 mm, and a weight of 2 kg. After placing, 10 ml of 0.9% saline was dropped from the above hole, and from the time when the saline came into contact with the upper substrate non-woven fabric, the saline was completely absorbed in the circumference of the hole of the measuring jig. The time to the point in time is measured and used as the absorption rate. The smaller the value, the better the absorption performance. This test was repeated 3 times in succession, and the results of the absorption rate at each test are shown in Table 1.

1 Absorbent article 10 Top sheet 20 Absorbent 20A Brushed area 20B Non-raised area 210 Upper layer base non-woven fabric 211 Lower base non-woven fabric 212 Heat seal 30 Back sheet

Claims (5)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet.
The absorber is a highly absorbent sheet in which a highly absorbent polymer is arranged between the upper-layer substrate nonwoven fabric and the lower-layer substrate nonwoven fabric.
In a plan view, the absorber is divided into a raised region in which the body-side surface of the lower-layer substrate nonwoven fabric is raised and a non-brushed region in which the body-side surface of the lower-layer substrate nonwoven fabric is not raised.
The raised area is a band-like continuous band in the longitudinal direction.
A plurality of raised regions are provided, and the raised regions are separated from each other in the width direction.
The highly absorbent polymer is located only in the non-raised region and is located only in the non-raised region.
An absorbent article having a widthwise dimension of the raised region of 10 mm or more and 20 mm or less. One of the plurality of raised regions is provided in the central portion in the width direction of the absorber, and the widthwise dimension of the raised region provided in the central portion in the width direction is the other raised region. The absorbent article according to claim 1, which is larger than the widthwise dimension of the above. A plurality of heat seals are formed on the upper-layer substrate nonwoven fabric and the lower-layer substrate nonwoven fabric along the width direction.
The heat seals are formed at equal intervals in the longitudinal direction.
The absorbent article according to claim 1 or 2, wherein the upper-layer substrate nonwoven fabric and the lower-layer substrate nonwoven fabric are bonded by the heat seal at a portion where the heat seal is formed. 3 ^{. _} The absorbent article described. The absorbent article according to any one of claims 1 to 4, wherein the absorbent article has a second absorbent body having a fluff pulp and a highly absorbent polymer between the absorbent body and the back sheet.

Images