JP7039797B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article such as a light incontinence pad, a light incontinence liner, and a urine absorbing pad.

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. This absorbent article has various absorption amounts depending on the amount of body fluid discharged under the assumed usage conditions. Of these, light incontinence pads and light incontinence liners are known to absorb a relatively small amount of urine. Comparing the two, the light incontinence pad is thicker and has higher absorption performance than the light incontinence liner, while the light incontinence liner is thinner and has lower absorption performance than the light incontinence pad. Yes, the user can select a product that suits his / her symptoms.

By the way, stress urinary incontinence is a typical symptom of the above-mentioned mild incontinence. Stress urinary incontinence is a condition in which a small amount of urine suddenly leaks when the abdomen is stressed, and the pelvic floor muscles that control urination by supporting the urethra weaken with childbirth and aging. It develops by. Because women have a shorter urethra than men, women are more susceptible to stress incontinence than men, and one in three adult women is said to experience stress incontinence. There is.

Currently, light incontinence pads and light incontinence liners are based on sanitary napkins and panty liners, and although product designs are made according to various sizes and absorption amounts, they suffer from light incontinence such as stress urinary incontinence. Many women are embarrassed by the symptoms of incontinence and are reluctant to purchase or use these incontinence products. As a result, many women suffering from incontinence often use their menstrual napkins as they are for light incontinence measures. However, the absorber of a general menstrual napkin does not contain or even contains a super absorbent polymer (also referred to as SAP) for ensuring absorption performance. Since the amount is very small, the thickness of the absorber does not change much even after the absorption of body fluid, and the menstrual napkin has the advantage that the wearing feeling is less likely to deteriorate compared to the light incontinence pad, but on the other hand, the menstrual napkin has an advantage. Then, there was a fundamental problem that urine leakage could not be sufficiently prevented as compared with a light incontinence pad or the like. Furthermore, after switching from a menstrual napkin to a light incontinence pad or a light incontinence liner, there were many cases where the menstrual napkin was used again due to problems such as difficulty in product selection and price. Against this background, studies have been conducted on means that women can use like menstrual napkins and prevent urine leakage.

As an invention for which such studies have been made, Patent Document 1 contains 40% by weight or more of a highly absorbent polymer with respect to the total weight of the highly absorbent polymer and the absorbent fiber, and reduces the pressure and thickness. The second sheet discloses an absorber using polyethylene terephthalate, which diffuses a wide range of liquids to increase the area of entry into the absorber and has an absorptive capacity. It is said that it can prevent the decrease of. Further, in Patent Document 2, an absorber having a fiber aggregate and a highly absorbent polymer, which is composed of a tow composed of fibers as the fiber aggregate, is used, and as a highly absorbent polymer, it is used. An absorber using a polymer having a water absorption amount of 60 g / g or more is disclosed, and it is said that the absorber can be made lighter and thinner without impairing the usability and absorption performance. There is.

International Publication No. 2005/0823305 Japanese Unexamined Patent Publication No. 2006-6742

However, in the absorbers described in Patent Document 1 and Patent Document 2, absorption performance can be ensured by a predetermined amount of highly absorbent polymer, and thinning can be realized by a predetermined device, but after absorbing urine. In, there is a problem that the thickness of the absorber increases with the swelling of the highly absorbent polymer and the wearing feeling deteriorates, and even if these absorbers are used for the absorbent article, women are like menstrual napkins. It was difficult to use for. Therefore, the present invention has been made in view of the above problems, and it is desired to provide an absorbent article capable of sufficiently preventing urine leakage without deteriorating the wearing feeling even after absorption of urine. The purpose.

In view of the above problems, the inventors of the present invention have conducted diligent research. As a result, it is an absorbent article having an absorber composed of an absorbent fiber and a highly absorbent polymer, and the content of the highly absorbent polymer is 0.1 g or more and 4.0 g or less, which is predetermined to the absorber. It has been found that the above-mentioned problems can be solved by the absorbent article provided with the slit of the above, and the present invention has been 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 composed of an absorbent fiber and a highly absorbent polymer, and the content of the highly absorbent polymer is 0.1 g or more and 4.0 g or less, and the absorber includes the absorber. At least one slit having a size of 1/3 or more with respect to the dimension in the longitudinal direction is provided in the longitudinal direction, and the slit is the first division, the second, from the front part to the rear part. When divided into four sections, the third section and the fourth section, the front end area consisting of the first section, the central area consisting of the second and third sections, and the rear end area consisting of the fourth section. The slit depth of the central region is deeper than that of the anterior end region and the posterior end region, and the average depth of the central region is 50% or more and 80% with respect to the thickness of the absorber. % Or less, and the average depth of the front end region and the rear end region is 20% or more and 40% or less with respect to the thickness of the absorber, and the said A liquid-permeable second sheet is arranged so as to follow the shape of the slit and adhere to the absorber, the top sheet does not follow the shape of the slit, and the top sheet is between the slit and the top sheet. It has voids, and the thickness of the absorbent article after injecting 20 ml of 0.9% physiological saline and allowing it to stand for 10 minutes is 50% or more and 105% of the thickness of the absorbent article before water injection. The following are absorbent articles.

(2) The second aspect of the present invention is the absorbent article according to (1), wherein the content of the highly absorbent polymer is 5% or more and 35% or less with respect to the weight of the absorber. It is characterized in that the liquid passing time of the highly absorbent polymer is within 25 seconds.

(3) The third aspect of the present invention is the absorbent article according to (1) or (2), wherein the thickness of the absorbent article before absorption under a load of 35 gf / cm ² is 2. It is characterized in that it is 0 mm or more and 8.5 mm or less.

(4) The fourth aspect of the present invention is the absorbent article according to any one of (1) to (3), after injecting 20 ml of 0.9% physiological saline and allowing it to stand for 10 minutes. The liquid diffusion length of the above is 90 mm or more.

(5) A fifth aspect of the present invention is the absorbent article according to any one of (1) to (4), wherein the second sheet is made of the same material as the top sheet. It is a thing.

Since the content of the highly absorbent polymer contained in the absorber used in the absorbent article of the present invention is 0.1 g or more and 4.0 g or less, it is sufficient to absorb urine within a range in which the absorber does not easily become thick. It contains a highly absorbent polymer and can sufficiently prevent urine leakage. Further, the absorber is provided with at least one slit in the longitudinal direction having a size of 1/3 or more with respect to the dimension in the longitudinal direction of the absorber, and the slit has slits from the front to the rear. When divided into four equal parts, the first division, the second division, the third division, and the fourth division, the front end region consisting of the first division and the central region consisting of the second division and the third division are used. The slit depth of the central region is deeper than that of the anterior end region and the posterior end region, and the average depth of the central region is the thickness of the absorber. The average depth of the front end region and the rear end region is 20% or more and 40% or less with respect to the thickness of the absorber. When the absorber has a slit having such a specific configuration, it is possible to improve the diffusivity of urine without impairing the wearing feeling and prevent urine leakage. In addition, since a liquid-permeable second sheet is placed between the top sheet and the absorber so as to follow the shape of the slit and adhere to the absorber, the diffusivity of urine is improved and the liquid return is suppressed. , It is possible to impart shape retention of the slit shape after urine absorption, and even when the amount of highly absorbent polymer contained in the absorber is increased, the thickness of the absorbent article after urine absorption is increased. Can be suppressed. In addition, the top sheet does not follow the shape of the slit, and there is a gap between the slit and the top sheet, so the area of the slit does not come into direct contact with the skin when worn, and it feels good to the touch. Excellent feeling. Further, in the absorbent article of the present invention, the thickness of the absorbent article after injecting 20 ml of 0.9% physiological saline and allowing it to stand for 10 minutes is 50% of the thickness of the absorbent article before water injection. Since it is 105% or less, the absorber does not easily become thick even after urine absorption, and it can be used without discomfort even when compared with a sanitary napkin, and it is excellent in wearing feeling. Therefore, the absorbent article of the present invention can sufficiently prevent urine leakage without deteriorating the wearing feeling even after absorption of urine.

It is a top view of the absorbent article of this invention. It is a cross _- sectional view of Y1 _- Y1 of FIG. FIG. ₁ is a cross-sectional view taken along the line X1 _- X1 of FIG.

<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, such as a light incontinence liner, a sanitary napkin, and the like. It may be an absorbent article. The absorbent article 1 includes a liquid-permeable top sheet 10 arranged on the body side surface, a liquid-impermeable back sheet 30 facing the top sheet 10 and arranged on the clothing side surface, the top sheet 10 and the top sheet 10. It comprises an absorber 20 disposed between the backsheets 30 and a liquid permeable second sheet 40 disposed between the topsheet 10 and the absorber 20, whereby the absorber 20 becomes the topsheet 10 and It has a structure sandwiched between the back sheet 30 and the back sheet 30. In the description of the present specification, the longitudinal direction of the absorbent article 1 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 FIG. Further, the width direction of the absorbent article 1 is a direction laterally or orthogonal to the longitudinal direction, and is a direction indicated by reference numeral X in FIG. Further, in the present specification, the body-side surface of the absorbent article 1 refers to the surface that comes into contact with the wearer's skin when the absorbent article 1 is worn, and the clothing-side surface is worn when the absorbent article 1 is worn. Refers to the surface that comes into contact with a person's clothing. Further, the absorbent article 1 is applied to the front portion 1a applied to the front side (ventral side) of the wearer, the crotch portion 1b applied to the crotch of the wearer, and the rear side (dorsal side) of the wearer. It is divided into the rear part 1c and the rear part 1c.

In the absorbent article 1 of the present invention, after injecting 20 ml of 0.9% physiological saline and allowing it to stand for 10 minutes, the thickness of the absorbent article 1 is the absorbency before water injection under a load of 35 gf / cm ² . It is preferably 50% or more and 105% or less, and preferably 75% or more and 100% or less with respect to the thickness of the article 1. As a result, the absorber 20 is less likely to become thick even after urine absorption, and can be used without discomfort as compared with a menstrual napkin, and is excellent in wearing feeling. Further, in the absorbent article 1 of the present invention, the thickness of the absorbent article 1 before absorption under a load of 35 gf / cm ² is preferably 2.0 mm or more and 8.5 mm or less, preferably 2.0 mm or more and 6 It is more preferably 0.0 mm or less, and further preferably 3.0 mm or more and 5.0 mm or less. By setting the thickness of the absorbent article 1 before absorption in this way, it is possible to suppress a sense of discomfort with respect to the thickness when worn. Further, from the viewpoint of absorption performance, the liquid diffusion length after injecting 20 ml of 0.9% physiological saline and allowing it to stand for 10 minutes is preferably 90 mm or more, more preferably 100 mm or more, and more preferably 110 mm. The above is more preferable.

[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 has the property of not irritating the skin. Hydrophilic non-woven fabric, open film such as open polyethylene film, foam such as urethane foam, etc. 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. Lotions, antioxidants, anti-inflammatory components, pH regulators, antibacterial agents, moisturizers and 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 its basis weight is preferably 15 g / m ² or more and 60 g / m ² or less from the viewpoint of processability and strength.

The back sheet 30 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.

Although not shown, the surface of the back sheet 30 on the clothing side may be provided with an adhesive layer for adhering 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.

[Absorber]
The absorber 20 contains an absorbent fiber as a base material and a highly absorbent polymer. The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as menstrual napkins, diapers and urine absorbing pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper and hydrophilic fiber are used. Rayon and the like can be mentioned. Among these, it is preferable to use fluff pulp from the viewpoint of absorbability. Examples of such fluff pulp include those obtained by defibrating wood pulp, synthetic fiber, polymer fiber, non-wood pulp and the like into a cotton-like shape. The absorbent fiber of the absorber 20 preferably has a basis weight of 50 g / m ² or more and 800 g / m ² or less, and a basis weight of 100 g / m ² or more and 500 g / m ² or less so as not to impair the absorption performance and the touch. Is more preferable.

The highly absorbent polymer used for the absorber 20 is not particularly limited as long as it can absorb body fluids and prevent backflow, and is sodium polyacrylate, polyasparagitate, (starch-acrylic acid). Those formed from materials such as a graft copolymer, 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. As the highly absorbent polymer, both a crushed type and a pearl type (one obtained by reverse phase suspension polymerization) can be used.

In the present invention, the content of the highly absorbent polymer constituting the absorber 20 is 0.1 g or more and 4.0 g or less, more preferably 0.3 g or more and 4.0 g or less, and 0.6 g or more and 4 It is more preferably 0.0 g or less. Therefore, the absorber 20 contains a highly absorbent polymer sufficient for absorbing urine in a range where it is difficult for the absorber 20 to become thick, and urine leakage can be sufficiently prevented. If the content of the highly absorbent polymer is less than 0.1 g, reversion is likely to occur due to a decrease in absorption performance, and urine leakage cannot be sufficiently prevented, and if it exceeds 4.0 g, it is difficult to prevent urine leakage. The absorbent article 1 after absorption tends to be thick, and the wearing feeling tends to be deteriorated.

The content of the highly absorbent polymer is preferably 5% or more and 35% or less with respect to the weight of the absorber 20, and the liquid passing time of the highly absorbent polymer described later is 25 seconds or less. It is preferably 20 seconds or less, and more preferably 20 seconds or less. By making the structure of the highly absorbent polymer in the absorber 20 in this way, when the absorbent article 1 is worn, the absorbent body 20 is less likely to become thick even after urine absorption, and the wearing feeling is excellent. When the content of the highly absorbent polymer is less than 5% with respect to the weight of the absorber 20, reversion is likely to occur due to a decrease in absorption performance, and urine leakage cannot be sufficiently prevented. On the other hand, if it exceeds 35%, the absorbent article 1 after absorption tends to be thick, and the wearing feeling tends to be deteriorated. Further, when the liquid passing time of the highly absorbent polymer used exceeds 25 seconds, the absorbent article 1 after absorption tends to be thick, and the wearing feeling tends to be deteriorated. Further, the highly absorbent polymer contained in the absorber 20 preferably has a basis weight of 10 g / m ^{2 or more and 200 g / m 2 or} less so as not to impair the balance between absorption performance and touch.

(Liquid passage time of highly absorbent polymer)
The method for measuring the liquid passing time of the above-mentioned highly absorbent polymer will be described. First, using a beaker with a capacity of 100 ml, 1.28 g ± 0.005 g of the highly absorbent polymer is immersed in a sufficient amount of 0.9% saline solution to swell, and then allowed to stand for 30 minutes. Next, a filtration cylinder having a funnel with a wire mesh and a cock at the lower end of the opening of the vertically erected glass with memory was prepared, and the highly absorbent polymer swollen in the filtration cylinder with the cock closed. All the contents of the above beaker including. After allowing to stand for 1 minute after charging, the cock is opened to allow the liquid to flow, and the time until the liquid level in the filtration cylinder reaches the scale line of 200 ml to the scale line of 100 ml is measured. Let the liquid flow time.

In the absorber 20, the form of the absorbent fiber and the highly absorbent polymer is preferably the form of a laminated mat formed by mixing the highly absorbent polymer particles in the absorbent fiber. Further, for the purpose of preventing leakage of the highly absorbent polymer particles and stabilizing the shape of the absorber 20, it is preferable to wrap the absorber 20 in the carrier sheet 24. In the present embodiment, as shown in FIGS. 2 and 3, the carrier sheet 24 wraps the absorber 20 so as to be in close contact with the absorber 20, and the top sheet side carrier sheet located on the top sheet 10 side of the absorber 20. It has 24a and a backsheet side carrier sheet 24b located on the backsheet 30 side of the absorber 20. The base material of the carrier sheet 24 may be any one having hydrophilicity, and examples thereof include hydrophilic non-woven fabrics such as tissue, absorbent paper, and air-laid non-woven fabric. When a plurality of carrier sheets 24 are provided, the base materials of the carrier sheets 24 may be the same or different, and the wrapping method when wrapping the absorber 20 with the carrier sheet 24 is particularly limited. is not it.

The basis weight of the absorber 20 is preferably 50 g / m ² or more and 500 g / m ² or less. By setting the basis weight of the absorber 20 in such a range, the absorbability is excellent and the leakage of body fluid can be effectively prevented. Further, the absorber 20 may be formed by laminating an upper layer absorber and a lower layer absorber. In this case, the dimensions of the upper layer absorber and the lower layer absorber in the longitudinal direction and the width direction may be larger than the dimensions of the lower layer absorber, and the dimensions of the upper layer absorber are the same as the dimensions of the lower layer absorber. The size of the upper layer absorber may be smaller than the size of the lower layer absorber.

[slit]
In the present invention, the absorber 20 is provided with at least one slit 21 in the longitudinal direction, which is 1/3 or more of the dimension in the longitudinal direction of the absorber 20, and the slit 21 is provided. When the slit 21 is divided into approximately four equal parts from the front portion 1a to the rear portion 1c into the first division, the second division, the third division, and the fourth division, the front end region 231 composed of the first division and the second division It is composed of a central region 22 composed of a third division and a rear end region 232 consisting of a fourth division, and the slit depth of the central region 22 is from the front end region 231 and the rear end region 232. The average depth of the central region 22 is 50% or more and 80% or less with respect to the thickness of the absorber 20, and the average depth of the front end region 231 and the rear end region 232 is the absorber 20. It is 20% or more and 40% or less with respect to the thickness of. The lengthwise dimension of the central region 22 is preferably 40% or more and 60% or less with respect to the lengthwise dimension of the slit 21. By having the slit 21 having such a specific configuration in the absorber 20, it is possible to improve the diffusivity of urine without impairing the wearing feeling and prevent urine leakage. When the average depth of the central region 22 is less than 50% with respect to the thickness of the absorber 20, urine leakage cannot be sufficiently prevented due to the decrease in urine diffusivity, which is 80%. If it exceeds the above value, the texture becomes hard and the wearing feeling tends to deteriorate. Similarly, if the average depth of the anterior end region 231 and the posterior end region 232 is less than 20% of the thickness of the absorber 20, urine leakage will be reduced due to reduced urine diffusivity. If it cannot be sufficiently prevented and exceeds 40%, it becomes hard to the touch and the wearing feeling tends to be deteriorated.

Further, as shown in FIG. 2, since the top sheet 10 does not follow the shape of the slit 21 and there is a gap between the slit 21 and the top sheet 10, the region of the slit 21 is directly formed when worn. It does not touch the skin, it feels good on the skin, and it is comfortable to wear.

From the viewpoint of absorption performance and wearing feeling, the dimension of the slit 21 in the width direction is preferably 0.5 mm or more and 15.0 mm or less, and more preferably 1.0 mm or more and 7.0 mm or less. It is more preferably 0.0 mm or more and 5.0 mm or less.

[Second seat]
The second sheet 40 allows the body fluid to quickly pass toward the absorber 20 and is arranged between the top sheet 10 and the absorber 20. Further, it is preferable that the second sheet 40 is arranged between the top sheet 10 and the absorber 20 so as to follow the shape of the slit 21 and be in close contact with the absorber 20. In the present embodiment, as shown in FIGS. 2 and 3, the second sheet 40 is arranged so as to follow the shape of the slit 21 and come into close contact with the absorber 20 via the carrier sheet 24a on the top sheet side. That is, the top sheet side carrier sheet 24a is sandwiched between the second sheet 40 and the absorber 20 following the shape of the slit 21. Further, when the carrier sheet 24 is not provided, the second sheet 40 follows the shape of the slit 21 between the top sheet 10 and the absorber 20 and adheres to the absorber 20 without interposing another sheet. May be placed in. The method of bringing the second sheet 40 into close contact with the absorber 20 is not particularly limited.

The second sheet 40 is simply arranged between the top sheet 10 and the absorber 20 to improve the diffusivity of urine, suppress the return of liquid, and impart the shape-retaining property of the slit 21 shape after urine absorption. be able to. Further, as described above, the second sheet 40 is arranged so as to follow the shape of the slit 21 and adhere to the absorber 20, so that the amount of the highly absorbent polymer contained in the absorber 20 is increased to some extent. Even if there is, it is possible to suppress an increase in the thickness of the absorbent article 1 after urine absorption.

The second sheet 40 is formed of a hydrophilic non-woven fabric, a foam film such as urethane foam, or a composite sheet in which these are laminated. Further, the second sheet 40 is preferably made of the same material as the top sheet 10. The second sheet 40 may be a single layer or may be laminated in a plurality of layers, and a large number of through holes may be formed in order to impart dry touch.

The basis weight of the second sheet 40 is preferably 15 g / m ² or more and 40 g / m ² or less from the viewpoint of workability and strength.

[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.

<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 liquid diffusible sheet and a three-dimensional gather are arranged on the top sheet 10 in advance. The absorber 20 to which the second sheet 40 follows the shape of the slit 21 and is in close contact with the second sheet 40 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 all around. It can be manufactured by fixing it with a hot melt adhesive, a heat seal, an ultrasonic seal, or the like. Then, it may be individually wrapped in a package while being folded in three in the longitudinal direction.

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 invention described in the above embodiments, and various modifications or modifications to the above embodiments are made. It will be apparent to those skilled in the art that improvements can be made. 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 4, Comparative Examples 1 to 4>
An absorbent article using the following absorber was prepared, and the absorption rate, the amount of liquid return, the feeling of wearing, and the shape retention of the slit were evaluated.

<Preparation of absorber>
First, each highly absorbent polymer having the liquid passing times shown in Tables 1 and 2 is mixed with the fluff pulp so as to have the ratio and weight shown in Tables 1 and 2, and then the longitudinal dimension is 200 mm. , The widthwise dimension was cut to 70 mm to obtain an absorber having the weights shown in Tables 1 and 2. The absorber is provided with two slits having a length dimension of 120 mm and a width direction dimension of 7 mm in the longitudinal direction, and further, the slits are provided with slits from the front part to the rear part in the first division. When it is divided into 4 equal parts, the 2nd division, the 3rd division and the 4th division, the front end area consisting of the 1st division, the central area consisting of the 2nd division and the 3rd division, and the rear part consisting of the 4th division. A side end region and is provided. It should be noted that the longitudinal dimension (%) of the central region with respect to the longitudinal dimension of the slit, the average depth (mm) of the central region, the front end region and the rear end region, and the average depth with respect to the thickness of the absorber ( %) Was adjusted to the values shown in Tables 1 and 2.

<Making absorbent articles>
The absorber produced in this way, in which the second sheet follows the shape of the slit and is in close contact with each other, is sandwiched between the top sheet and the back sheet, and a hot melt adhesive is used over the entire circumference of the top sheet and the back sheet. A light incontinence pad having a longitudinal dimension of 230 mm and a width dimension of 85 mm was produced. A hydrophilic air-through non-woven fabric (basis weight 25 g / m ² ) is used as the top sheet, a breathable polyethylene film (basis weight 32 g / m ² ) is used as the back sheet, and a top sheet is used as the second sheet. Similarly, a hydrophilic air-through non-woven fabric (basis weight 25 g / m ² ) was used. In the production of the absorbent article, the top sheet was not made to follow the shape of the slit, and the slit and the top sheet were adjusted to have a gap.

(Liquid passage time of highly absorbent polymer)
A method for measuring the liquid passing time of the highly absorbent polymer used for the absorber will be described. First, using a beaker with a capacity of 100 ml, 1.28 g ± 0.005 g of the highly absorbent polymer was immersed in a sufficient amount of 0.9% physiological saline to swell, and allowed to stand for 30 minutes. Next, a filtration cylinder having a funnel with a wire mesh and a cock at the lower end of the opening of the vertically erected glass with memory was prepared, and the highly absorbent polymer swollen in the filtration cylinder with the cock closed. All the contents of the above beaker including the above were put in. After allowing to stand for 1 minute after charging, the cock is opened to allow the liquid to flow, and the time until the liquid level in the filtration cylinder reaches the scale line of 200 ml to the scale line of 100 ml is measured. The liquid passing time was set.

(Thickness of absorbent article and liquid diffusion length before and after absorption)
The thickness of the absorbent article before water injection was measured under a load of 35 gf / cm ² , and further, 20 ml of 0.9% physiological saline was injected and allowed to stand for 10 minutes, and then the thickness of the absorbent article and liquid diffusion. The length was measured.

(Absorption rate)
A cylindrical measuring jig with a bottom area of 16.8 cm ² and a mass of 755.6 g with a hole with an inner diameter of 19 mm was placed on the center of the absorbent article, and 0.9% saline from the upper hole. 20 ml of saline solution was injected, and the time was measured with the time point when the physiological saline solution came into contact with the absorbent article as the starting point and the time point when the liquid was completely sucked into the circumference in the center circle of the measuring jig as the ending point. The smaller the value, the better the absorption performance.

(Amount of liquid return)
20 ml of 0.9% physiological saline is injected into the center of the absorbent article, and after 10 minutes, a filter paper (ADVANTEC No. 2 filter paper, diameter 55 mm) weighed in advance is placed in the center of the injection section, and the filter paper is placed. A 687 g weight was placed on top of the weight so that the pressure was 35 gf / cm ² . One minute after the weight was placed, the weight of the filter paper was measured, and the weight difference (g) of the filter paper before and after the test was taken as the amount of liquid return. The liquid return amounts shown in Tables 1 and 2 are average values of the results of tests on 10 samples. The smaller the amount of liquid returned, the better the absorption performance.

(Wearing feeling: No discomfort due to change in thickness after absorption)
Twenty panelists investigated the absence of discomfort due to changes in thickness after absorption by selecting "discomfort" or "no discomfort", and evaluated according to the following criteria. Wearing evaluation was carried out by 20 panelists and evaluated. In addition, ◎ and ○ were accepted.
◎: When “no discomfort” is 16 or more and 20 or less ○: When “no discomfort” is 11 or more and 15 or less △: When “no discomfort” is 6 or more and 10 or less ×: When there is no "no discomfort" or when there are 1 or more and 5 or less people

(Wearing feeling: No discomfort due to liquid return after absorption)
Twenty panelists investigated the lack of discomfort due to liquid return after absorption by selecting "no discomfort" or "discomfort", and evaluated according to the following criteria. In addition, ◎ and ○ were accepted.
⊚: When “no discomfort” is 16 or more and 20 or less ○: When “no discomfort” is 11 or more and 15 or less △: “No discomfort” is 6 or more and 10 or less When ×: When there is no "no discomfort" or when there are 1 or more and 5 or less people

(Wearing feeling: Softness before absorption)
Twenty panelists investigated the softness before absorption by selecting "soft" or "hard", and evaluated it according to the following criteria. In addition, ◎ and ○ were accepted.
◎: When “soft” is 16 or more and 20 or less ○: When “soft” is 11 or more and 15 or less △: When “soft” is 6 or more and 10 or less ×: Is there “soft”? When 1 or more and 5 or less

(Slit shape retention)
Twenty panelists investigated the shape retention of slits by selecting "good slit shape retention" or "poor slit shape retention" and evaluated them according to the following criteria. In addition, ◎ and ○ were accepted.
◎: When “good shape retention” is 16 or more and 20 or less ○: When “good shape retention” is 11 or more and 15 or less △: “Good shape retention” is 6 or more 10 When there are less than 1 person ×: When there is no "good shape retention" or when there are 1 or more and 5 or less people

From the above, it can be seen that according to the absorbent article of the present invention, urine leakage can be sufficiently prevented without deteriorating the wearing feeling even after absorption of urine.

1 Absorbent article 1a Front 1b Crotch 1c Rear 10 Top sheet 20 Absorber 21 Slit 22 Slit central area 231 Slit front end area 232 Slit rear end area 24 Carrier sheet 24a Top sheet side Carrier sheet 24b Back sheet side Carrier sheet 30 Back sheet 40 Second sheet

Claims (2)

An absorbent article for preventing urine leakage , comprising 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 composed of an absorbent fiber and a highly absorbent polymer.
The content of the highly absorbent polymer is 0.1 g or more and 4.0 g or less.
The absorber is provided with two slits in the longitudinal direction having a dimension of 1/3 or more with respect to the dimension in the longitudinal direction of the absorber.
When the slit is divided into approximately four equal parts, the first division, the second division, the third division, and the fourth division from the front portion to the rear portion, the slit has a front end region composed of the first division and a second portion. It is composed of a central region consisting of divisions and a third division, and a rear end region consisting of a fourth division.
The slit depth in the central region is deeper than in the anterior and posterior end regions.
The average depth of the central region is 50% or more and 80% or less with respect to the thickness of the absorber.
The average depth of the front end region and the rear end region is 20% or more and 40% or less with respect to the thickness of the absorber.
A liquid-permeable second sheet is arranged between the top sheet and the absorber so as to follow the shape of the slit and adhere to the absorber.
The top sheet does not follow the shape of the slit, and there is a gap between the slit and the top sheet.
The content of the highly absorbent polymer is 5% or more and 35% or less with respect to the weight of the absorber, and the liquid passing time of the highly absorbent polymer is 25 seconds or less.
The thickness of the absorbent article before absorption under a load of 35 gf / cm ² is 2.0 mm or more and 8.5 mm or less.
The thickness of the absorbent article after injecting 20 ml of 0.9% physiological saline into the absorbent article and allowing it to stand for 10 minutes is 50% or more 105 with respect to the thickness of the absorbent article before water injection. % Or less ,
An absorbent article in which 20 ml of 0.9% physiological saline is poured into the absorbent article and allowed to stand for 10 minutes, and then the liquid diffusion length in the longitudinal direction of the absorber is 90 mm or more . The absorbent article according to claim 1, wherein the second sheet is a hydrophilic non-woven fabric, a foam film such as urethane foam, or a composite sheet in which these are laminated .

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