JP6839161B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article.

Disposable diapers are known as an example of absorbent articles. Some such disposable diapers have an indicator function for visualizing the amount of excrement absorbed and informing the user when to replace the diaper. For example, Patent Document 1 includes a urination indicator whose color changes when it comes into contact with urine between the absorbent body of the diaper and the back sheet, and the exterior non-woven fabric is consolidated at a portion overlapping the urination indicator. , Disposable diapers with enhanced visibility of indicators are disclosed.

Japanese Unexamined Patent Publication No. 2012-100886

According to the disposable diaper of Patent Document 1, the user (for example, a person who causes the wearer to wear the diaper) can visually recognize that urination has been performed from the outside of the diaper. On the other hand, when trying to detect stool by an indicator, stool has lower fluidity than urine, so the stool should be permeated through the top sheet to reach the indicator provided on the back sheet (back sheet) side. Was difficult. Therefore, it is difficult to accurately detect that defecation has occurred.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an absorbent article in which excreted stool can easily reach an indicator.

The main invention for achieving the above object is
It has a longitudinal direction, a width direction, and a thickness direction in the unfolded state.
Absorbents with a liquid-absorbing absorbent core and
A top sheet provided on the skin side in the thickness direction of the absorber and
A stool indicator provided on the non-skin side in the thickness direction of the absorber and exhibiting a predetermined reaction when in contact with stool.
It is an absorbent article having
In the thickness direction, a second sheet is arranged between the top sheet and the stool indicator.
It has a core wrap sheet that covers the absorbent core from the skin side and the non-skin side in the thickness direction.
The second sheet is located on the skin side in the thickness direction of the core wrap sheet on the skin side.
The Krem water absorption of the second sheet is larger than the Krem water absorption of the top sheet.
The second sheet is an absorbent article characterized in that the Krem water absorption of the second sheet is larger than the Krem water absorption of the core wrap sheet.

Other features of the present invention will be clarified by the description in the present specification and the accompanying drawings.

According to the present invention, it is possible to provide an absorbent article in which the excreted stool can easily reach the indicator.

It is a top view in the state which the diaper 1 is expanded and extended. It is sectional drawing in line AA shown in FIG. It is a figure which shows the modification of the stool indicator 40 and the urine indicator 50. It is a table which showed the result of having performed the verification experiment about the relationship between the magnitude of the Krem water absorption of each sheet member, and the reactivity of a stool indicator 40. FIG. 5 is a partially enlarged cross-sectional view showing another configuration of the low basis weight portion 21A (absorbent core 24).

The description of the present specification and the accompanying drawings will clarify at least the following matters.
In the unfolded state, it has a longitudinal direction, a width direction, and a thickness direction, an absorber, a top sheet provided on the skin side in the thickness direction of the absorber, and a thickness direction of the absorber. An absorbent article comprising a stool indicator provided on the non-skin side of the body and exhibiting a predetermined reaction when in contact with stool, in the thickness direction between the top sheet and the stool indicator. An absorbent article characterized in that one or more sheet members are arranged, and the Krem water absorption of the sheet member is larger than the Krem water absorption of the top sheet.

According to such an absorbent article, when stool is excreted on the skin side of the top sheet, the water contained in the stool is drawn to the non-skin side by the sheet member having a high Krem water absorption degree, and the stool indicator is drawn from the top sheet. It becomes easier to penetrate to the side. Therefore, it is possible to make it easier for the stool to reach the stool indicator.

In such an absorbent article, it is desirable that the sheet member is a second sheet provided between the top sheet and the absorber in the thickness direction.

According to such an absorbent article, the moisture contained in the stool is drawn to the non-skin side by the second sheet, and easily permeates from the top sheet to the stool indicator side. Therefore, it is possible to make it easier for the stool to reach the indicator.

In such an absorbent article, the absorber has a liquid-absorbing absorbent core, and the sheet member includes a core wrap sheet that covers the absorbent core from the skin side and the non-skin side in the thickness direction, and the sheet member. It is desirable that it is at least one of the second sheets.

According to such an absorbent article, the moisture contained in the stool is drawn to the non-skin side by the second sheet or the core wrap sheet, and easily permeates from the top sheet to the stool indicator side. Therefore, it is possible to make it easier for the stool to reach the indicator.

In such an absorbent article, it is desirable that the Krem water absorption of the second sheet is larger than the Krem water absorption of the core wrap sheet.

According to such an absorbent article, only water (stool juice) can be strongly drawn from the top sheet to the non-skin side from the stool in a state where particles and stool juice are mixed. In addition, it is possible to prevent the stool juice from diffusing in the core wrap sheet. Therefore, the water contained in the stool can reach the stool indicator to facilitate the detection of the stool.

In such an absorbent article, it is desirable that the center of the second sheet is located behind the center of the absorbent article in the longitudinal direction.

According to such an absorbent article, when the absorbent article is worn, the second sheet is placed on the buttock side (that is, near the anus) of the wearer, so that the discharged stool is quickly drawn to the non-skin side. be able to. This makes it easier for the stool to reach the stool indicator.

In such an absorbent article, it is desirable that the front end of the second sheet is located posterior to the center of the absorbent article in the longitudinal direction.

According to such an absorbent article, when the absorbent article is folded in half at the center in the longitudinal direction when worn, the second sheet is less likely to bend and the second sheet is prevented from peeling off from the top sheet. Therefore, the drawing of stool juice from the top sheet to the second sheet is less likely to be hindered, and the stool juice easily reaches the stool indicator.

It is desirable that the absorbent article has a portion where the seat member and the stool indicator overlap in the longitudinal direction and the width direction.

According to such an absorbent article, the stool (stool juice) drawn from the skin side surface of the top sheet to the non-skin side in the thickness direction by the sheet member (second sheet and core wrap sheet) is directly drawn in the thickness direction. It penetrates the non-skin side of the skin, making it easier to come into direct contact with the stool indicator. As a result, the accuracy of stool detection by the stool indicator can be improved.

In such an absorbent article, the absorber has a low basis weight portion in the central portion in the width direction, and the basis weight of the low basis weight portion is the low basis weight portion from the outside in the width direction. It is desirable that the low basis weight portion and the stool indicator overlap each other in the longitudinal direction and the width direction, which are lower than the basis weight of the adjacent region.

According to such an absorbent article, stool (stool juice) permeates the low basis weight portion of the absorber and moves from the skin side to the non-skin side, and easily reaches the stool indicator. Therefore, the detectability of stool by the stool indicator can be further improved.

Among such absorbent articles, a second sheet provided on the non-skin side in the thickness direction of the top sheet, and a back sheet provided on the non-skin side in the thickness direction of the absorber. In the thickness direction, the stool indicator is arranged between the low basis weight portion of the absorber and the back sheet, and in the width direction, in a region corresponding to the low basis weight portion. It is desirable that the top sheet and the second sheet are joined in the thickness direction.

According to such an absorbent article, by joining the top sheet and the second sheet in the region corresponding to the low basis weight portion, no space is created in the thickness direction between the top sheet and the second sheet, and the thickness is increased. Direction It is possible to improve the ability of stool to draw in water to the non-skin side.

In such an absorbent article, the absorbent body has an absorbent core and a core wrap sheet covering the skin side surface and the non-skin side surface of the absorbent core, and has the low basis weight portion in the width direction. It is desirable that the second sheet and the core wrap sheet are joined in the thickness direction in the corresponding region.

According to such an absorbent article, by joining the second sheet and the core wrap sheet in the region corresponding to the low basis weight portion, a space is created in the thickness direction between the second sheet and the core wrap sheet. However, it is possible to improve the ability of stool to draw in water to the non-skin side in the thickness direction.

In such an absorbent article, it is desirable that the core wrap sheet and the back sheet are joined in the thickness direction in the region corresponding to the low basis weight portion in the width direction.

According to such an absorbent article, by joining the core wrap sheet and the back sheet in the region corresponding to the low basis weight portion, a space is created in the thickness direction between the core wrap sheet and the back sheet. Instead, the water in the stool that has passed through the absorber can easily reach the stool indicator.

In such an absorbent article, it is desirable that the low basis weight portion has a region where the basis weight is zero at least in the central portion in the width direction.

According to such an absorbent article, by providing the region having zero basis weight in the low basis weight portion, the water content of the stool penetrates through the region having zero basis weight and is easily drawn into the lower layer. By improving the pullability to the lower layer, the response of the stool indicator can be enhanced.

Among such absorbent articles, a second sheet provided on the non-skin side in the thickness direction of the top sheet, and a back sheet provided on the non-skin side in the thickness direction of the absorber. The absorber has an absorbent core and a core wrap sheet covering the skin side surface and the non-skin side surface of the absorbent core, and corresponds to a region where the basis weight is zero in the width direction. In the region, it is desirable that the top sheet, the second sheet, the core wrap sheet, and the back sheet are joined in the thickness direction.

According to such an absorbent article, no space is generated in the thickness direction between the sheets, and it is possible to improve the drawability of stool moisture to the non-skin side in the thickness direction.

In such an absorbent article, the core wrap sheet has a skin side portion covering the skin side surface of the absorbent core and a non-skin side portion covering the non-skin side surface, and the basis weight is increased in the width direction. It is desirable that the skin side portion and the non-skin side portion of the core wrap sheet are joined in the thickness direction in the region corresponding to the region of zero.

According to such an absorbent article, no space is generated in the thickness direction between the skin side portion and the non-skin side portion of the core wrap sheet, and the stool moisture can be drawn into the non-skin side in the thickness direction. Can be improved.

In such an absorbent article, it is desirable that the center of the stool indicator is located posterior to the center of the absorbent article in the longitudinal direction.

According to such an absorbent article, the position of the stool indicator and the wearer's anus (buttocks) are close to each other in the longitudinal direction. Therefore, the excreted stool can easily reach the stool indicator, and the stool detection accuracy can be further improved.

In such an absorbent article, the area of the stool indicator arranged behind the center of the absorbent article in the longitudinal direction is arranged in front of the center of the absorbent article in the longitudinal direction. It is desirable that it is larger than the area that is being used.

According to such an absorbent article, the detectable range by the stool indicator can be widened in the region near the wearer's anus (rear side in the longitudinal direction). Therefore, the accuracy of stool detection can be further improved.

=== Embodiment ===
As the absorbent article according to the present invention, an embodiment will be described by taking a tape-type disposable diaper for infants as an example. However, the present invention is not limited to this, and the present invention can be applied to, for example, pants-type and pad-type disposable diapers, tape-type disposable diapers for adults, and the like.

<Basic configuration of tape-type disposable diaper 1>
FIG. 1 is a plan view of a tape-type disposable diaper 1 (hereinafter, also referred to as “diaper”) in an unfolded and stretched state. FIG. 2 is a cross-sectional view taken along the line AA shown in FIG. The extended state of the diaper 1 is a state in which the wrinkles generated in the diaper 1 are substantially invisible in the unfolded state of the diaper 1, and each member constituting the diaper 1 (for example, described later). The diaper 1 is in a stretched state until the size of the top sheet (22, etc.) is equal to or close to the size of the member alone.

The diaper 1 of the present embodiment is a so-called open type disposable diaper, and has a front portion 3, an inseam portion 5, and a rear portion 7 as shown in FIG. The front portion 3 is a portion that will be located in the front portion (ventral side, front waist circumference) of the wearer. Further, the rear portion 7 is a portion to be located at the rear portion (dorsal side, rear waist circumference) of the wearer. The inseam 5 is a portion that will be located between the front 3 and the rear 7.

In the following description, each direction is defined as shown in FIG. That is, in the extended diaper 1, the direction from the front portion 3 to the rear portion 7 is defined as the "longitudinal direction", and the direction orthogonal to the longitudinal direction is defined as the "width direction". The line BB shown in FIG. 1 is a line indicating the center of the diaper 1 in the longitudinal direction. Further, as shown in FIG. 2, the direction orthogonal to the longitudinal direction and the width direction is defined as the "thickness direction", the wearer's skin side is defined as the "skin side", and the opposite side is defined as the "non-skin side". ..

The diaper 1 has a central band-shaped region 12, side flaps 14, leg gathers 16, and leg side gathers 17. Fastening tape 30 is attached to each of the pair of side flaps 14 at the rear portion 7.

The central strip-shaped region 12 is a strip-shaped region located in the central portion in the width direction composed of the front portion 3, the inseam portion 5, and the rear portion 7 (see FIG. 1). The central band-shaped region 12 is a portion that absorbs and retains a liquid such as urine excreted by the wearer. The central band-shaped region 12 has a vertically elongated shape (shape along the longitudinal direction) including the liquid-retaining absorber 21. The central band-shaped region 12 mainly includes an absorber 21, a liquid-permeable top sheet 22 that covers the absorber 21 from the skin side, and a liquid-impermeable back sheet 23 that covers the absorber 21 from the non-skin side. And an exterior sheet 27 (for example, a non-woven fabric) forming the exterior of the diaper 1 (see FIG. 2). A second sheet 35, which is liquid permeable, is further provided in the central band-shaped region 12.

As shown in FIG. 2, the absorber 21 of the present embodiment covers the absorbent core 24 that absorbs excrement such as urine and the absorbent core 24 from both the skin side and the non-skin side in the thickness direction, respectively. It has a liquid-permeable core wrap sheet 25.

The absorber 21 (absorbent core 24) is arranged over the front portion 3, the inseam portion 5, and the rear portion 7. The absorbent core 24 of the present embodiment has a substantially hourglass shape in a plan view as an example of a predetermined shape. As the liquid absorbent material constituting the absorbent core 24, for example, a liquid absorbent fiber such as pulp fiber or a liquid absorbent granular material such as a highly absorbent polymer (so-called SAP) can be used. Further, it may contain a liquid-absorbing material other than the liquid-absorbing fiber and the liquid-absorbing granule.

The side flaps 14 are portions located on both sides of the central band-shaped region 12 in the width direction. The side flaps 14 are formed over the front portion 3, the inseam portion 5, and the rear portion 7 (see FIG. 1). The width direction length (width) of the side flap 14 at the inseam 5 is narrower than the width direction length (width) of the side flap 14 at the front portion 3 and the rear portion 7. The side flap 14 is mainly composed of a skin side sheet 26 and a back sheet 23 (see FIG. 2). The skin-side sheet 26 is a skin-side member formed over the front portion 3, the inseam portion 5, and the rear portion 7, and is made of, for example, a non-woven fabric. The skin side sheet 26 is also a member constituting the leg side gather 17 (three-dimensional gather), and the outer part of the skin side sheet 26 (the part outside the joint portion 26A shown by the broken line in FIG. 1) is the side flap 14. To configure.

A pair of elastic members around the legs (for example, rubber threads) that can expand and contract in the longitudinal direction are provided between the absorber 21 and the back sheet 23 at least in the crotch portion 5 of the central band-shaped region 12. The leg circumference elastic member 28 is a member that imparts elasticity to the central band-shaped region 12 of the inseam 5. In the present embodiment, the elastic member 28 around the leg is attached in a state of being extended in the longitudinal direction. As a result, the elastic member 28 around the leg exerts a contractile force along the longitudinal direction with respect to the inseam 5 of the central band-shaped region 12.

Each of the pair of side flaps 14 is provided with leg gather elastic members 15 that expand and contract along the longitudinal direction. The leg gather elastic member 15 is an elastic member that expands and contracts along the longitudinal direction, and is a member that imparts elasticity to the leg circumference opening when the diaper 1 is worn. That is, the leg gather elastic member 15 is a leg circumference elastic member that fits the leg extension portion of the diaper 1 to the wearer's leg. Further, the leg gather 16 is formed by the leg gather elastic member 15 imparting elasticity to the skin side seat 26 and the back sheet 23 of the inseam 5.

The leg side gathers 17 are three-dimensional gathers for preventing liquid leakage from the gaps between the legs. The pair of leg side gathers 17 are formed along the longitudinal direction over the front portion 3, the inseam portion 5, and the rear portion 7 (see FIG. 1). The leg side gathers 17 are formed inside the side flaps 14 so as to cover both edges of the central band-shaped region 12.

The leg side gather 17 (three-dimensional gather) is mainly composed of a portion inside the skin side sheet 26 in the width direction (see FIG. 2). The inner edge of the skin side sheet 26 of the inseam 5 has elasticity due to the leg side gather elastic member 18 such as rubber thread. The skin side sheet 26 is joined along the longitudinal direction at the joint portion 26A between the central band-shaped region 12 and the side flap 14. When the diaper 1 is worn, the elasticity of the leg side gather elastic member 18 causes the area inside the joint portion 26A of the skin side sheet 26 to rise toward the wearer's skin side with the joint portion 26A as a base point, and beside excrement and the like. Suppress leaks.

Fastening tapes 30 are arranged on both sides of the side flaps 14 in the width direction at the rear portion 7 of the diaper 1 (see FIG. 1). Then, by locking each fastening tape 30 to the target tape 29 (FIG. 1) described later, the waist circumference opening and the leg circumference opening of the diaper 1 are formed, and the position of the diaper 1 with respect to the wearer's body (body). Can be fixed.

A target tape 29 is provided on the front portion 3 of the central strip-shaped region 12 (see FIG. 1). The target tape 29 is arranged on the non-skin side of the back sheet 23 of the front portion 3. The target tape 29 is a member that can be engaged with the fastening tape 30, and is formed of, for example, a non-woven fabric. The target tape 29 constitutes a target region in which the fastening tape 30 is engaged. Instead of arranging the target tape 29 on the non-skin side of the back sheet 23, the target region may be directly formed on the non-woven fabric of the outermost layer constituting the back sheet 23. Then, by engaging the fastening tape 30 with the target tape 29, the diaper 1 is worn.

The diaper 1 of the present embodiment has a stool indicator 40 at the center of the diaper 1 in the width direction, and further has a pair of urine indicators 50 separated outward from the stool indicator 40 in the width direction. ing. The stool indicator 40 and the urine indicator 50 are arranged on the non-skin side of the absorber 21 in the thickness direction, respectively. The urine indicator 50 is configured as an indicator containing a pH indicator used in conventional general diapers. For example, the urine indicator 50 detects that urine has been excreted by exhibiting a predetermined reaction (for example, a color reaction) by contacting with urine, using the pH of urine as a reaction factor (urine indicator reaction factor). .. Details of the stool indicator 40 will be described later.

<Principle of stool indicator 40>
The stool indicator 40 is a stool indicator for an absorbent article such as a diaper 1, and causes a predetermined reaction (for example, a color reaction) by contacting with a predetermined reaction factor (stool indicator reaction factor) contained in the stool. By presenting, it is detected that the stool has been discharged. In the present embodiment, the stool indicator 40 contains a chemical component that detects a biological substance in the stool, and the response of this chemical component to stool and the response to urine are different, so that only stool excretion is detected. It is possible.

For example, when a biological substance detected by a chemical component contained in the stool indicator 40 is used as a protein, it is preferable to use a pH indicator as the chemical component. Generally, a protein has a structure in which amino acids are polymerized, and has acidic and basic functional groups at both ends and side chains of the main chain of the protein. Therefore, when a certain amount of protein is present, The pH indicator can be discolored (protein error method). In the present embodiment, the pH indicator responds to stool by detecting undigested protein derived from food in stool, protein secreted from intestinal bacteria, and the like.

As a specific pH indicator, for example, tetraphenol blue can be used. In this case, in the presence of the protein, it binds to the free amino group in the protein to form a salt-like blue compound, and exhibits a blue color corresponding to a pH higher than the true pH. Therefore, when the stool indicator 40 containing tetraphenol blue comes into contact with the stool, the color changes from yellow to blue. In order to facilitate discoloration of the pH indicator, it is desirable to set the pH to an acidic side of about 3 in advance. Therefore, the pH indicator may contain a citric acid buffer or the like.

As described above, by using the predetermined pH indicator, the pH indicator does not color due to the pH change of the urine or the stool itself, and the pH indicator can be colored in response to the protein. The pH indicator used in the protein error method is not limited to the above-mentioned tetraphenol blue, and other pH indicators can also be used. For example, bromophenol blue, bromocresol green, thymolphthalein and the like, or other indicators can be used. Further, it is desirable that the pH indicator is safe for the skin and has excellent storage stability in moisture and sunlight.

Further, in the stool indicator 40, it is desirable that the chemical components contained in the stool indicator 40 respond to stool and not urine so as not to erroneously detect whether the excrement is stool or urine. .. Therefore, the stool indicator 40 in the present embodiment shows a reaction such as a color reaction in response to a stool indicator reaction factor (protein or the like) having a predetermined concentration or higher, and when the stool indicator reaction factor is smaller than the predetermined concentration, It makes it difficult for a reaction to occur.

In general, the urine of a healthy person does not contain protein, and even in an unhealthy person, the protein in the urine is less than 10,000 mg / L. Therefore, in the present embodiment, the stool indicator 50 preferably responds to a protein of 150 mg / L or more, and more preferably responds to a protein of 5,000 mg / L or more by the protein error method using a pH indicator. It is preferable, and it is more preferable to respond to a protein of 10,000 mg / L or more. For example, when bromophenol blue is used as a chemical component and the stool indicator 50 responds to a protein of 150 mg / L or more, the applied amount of the pH indicator per 1 cm2 in the stool indicator 50 may be 16.3 μg. Preferably, when the stool indicator 50 responds to a protein of 5,000 mg / L or higher, the application amount of the pH indicator per cm2 of the stool indicator 50 is preferably 0.5 μg, and the stool indicator 50 is 10,000 mg / L. When responding to a protein of L or more, the applied amount of the pH indicator per 1 cm2 on the stool indicator 50 is preferably 0.25 μg. By setting the applied amount of the pH indicator to 17.0 μg or less, the safety of the stool indicator 40 for the wearer of the absorbent article is enhanced.

In the present embodiment, by adjusting the application amount of the pH indicator in this way, the range in which the stool indicator 40 can react to urine is relatively small as compared with the range in which the stool indicator 40 can react to stool. be able to. In other words, the response of the stool indicator 40 to stool and the response of the stool indicator 40 to urine can be different. This makes the stool indicator 40 less responsive to urine.

Further, the stool indicator 40 does not limit the above-mentioned protein as a reaction factor. For example, it may react with a substance derived from stool, such as intestinal bacteria contained in stool, ionic strength of stool that correlates with the specific gravity of stool, and bilirubin, which is a bile pigment. These components are generally not contained in urine, or are contained in urine in a very small amount or specific gravity as compared with stool. Therefore, as in the case where protein is used as a reaction factor, the stool indicator 40 is less likely to react to urine and more likely to react to stool. Therefore, the excreted stool in the diaper 1 can be detected accurately.

The stool indicator 40 is formed by applying an adhesive (for example, hot melt adhesive HMA) containing the above-mentioned chemical components (for example, a pH indicator) to the skin side surface of the back sheet 23 of the diaper 1. In the present embodiment, as shown in FIG. 1, a hot melt adhesive is used in a strip-shaped (or linear) region along the longitudinal direction from the inseam 5 to the rear 7 in the center in the width direction using a coater. The stool indicator 40 is formed by applying (HMA). According to such coater coating, it is possible to form the stool indicator 40 having a uniform film thickness and less unevenness, and it is possible to improve the stool detection accuracy. Moreover, the manufacturing cost can be suppressed. The urine indicator 50 can also be formed in the same manner.

Further, the stool indicator 40 may be formed by mixing the chemical composition with the ink and printing and coating the back sheet 23 and the core wrap sheet 25. Further, the stool indicator 40 is formed by joining and fixing the filter paper or the non-woven fabric impregnated with the chemical component to the back sheet 23 or the core wrap sheet 25 by hot melt adhesive (HMA) or ultrasonic welding. Is also good.

Further, the stool indicator 40 and the urine indicator 50 may be formed by patterns of different patterns instead of the band-shaped pattern as shown in FIG. FIG. 3 is a diagram showing a modified example of the stool indicator 40 and the urine indicator 50. In FIG. 3, the stool indicator 40 is formed by the symbol pattern represented by the star mark, and the urine indicator 50 is formed by the symbol pattern represented by the face mark. As shown in FIG. 3, since the stool indicator 40 and the urine indicator 50 have different design patterns, it becomes easy to visually distinguish between defecation and urination from the outside of the diaper 1, causing misunderstanding by the user. It can be made difficult.

Further, the stool indicator 40 may be formed by a pattern of a pattern, and the urine indicator 50 may be formed by a band pattern. On the contrary, the stool indicator 40 may be formed by a band pattern, and the urine indicator 50 may be formed by a pattern pattern. Even in such a case, since the visual difference between the stool indicator 40 and the urine indicator 50 becomes clear, the user can easily distinguish between defecation and urination.

Further, in the present embodiment, the stool indicator 40 is arranged closer to the rear side (dorsal side) in the longitudinal direction. In other words, the stool indicator 40 is arranged so that the center of the stool indicator 40 is located behind the center of the diaper 1 (the position of the line BB in FIG. 1) in the longitudinal direction. With this arrangement, the position of the stool indicator 40 and the wearer's anus (buttocks) are close to each other in the longitudinal direction. Therefore, the excreted stool can easily reach the stool indicator 40, and the stool detection accuracy can be further improved.

Further, in the stool indicator 40, the area arranged on the posterior side (dorsal side) of the center in the longitudinal direction (position of lines BB in FIG. 1) is on the anterior side (ventral side) of the center in the longitudinal direction. It is desirable that it is larger than the area arranged in. That is, it is desirable that the stool indicator 40 is provided so that the area on the rear side is larger than that on the front side in the longitudinal direction. In this way, the range in which the stool can be detected by the stool indicator 40 can be widened in the region near the wearer's anus (that is, the posterior side in the longitudinal direction). Therefore, the accuracy of stool detection can be further improved.

<About stool permeability>
In order to detect stool by the stool indicator 40, it is necessary to bring the water (stool juice) contained in the stool into contact with the stool indicator 40. Therefore, it is necessary for the stool (stool juice) excreted on the top sheet 22 provided on the skinmost side of the diaper 1 to reach the stool indicator 40 provided on the back sheet 23. That is, it is necessary to allow the stool (stool juice) to reach the stool indicator 40 by allowing the sheet member provided on the skin side in the thickness direction of the stool indicator 40 to permeate.

In diaper 1, at least three sheet members, a top sheet 22, a second sheet 35, and a core wrap sheet 25, are laminated on the skin side in the thickness direction of the stool indicator 40 as shown in FIG. .. In the present embodiment, the stool (stool juice) can easily reach the stool indicator 40 by appropriately adjusting the permeability of the liquid (stool juice or urine) in each of the sheet members 22, 35, 25. doing. Specifically, the magnitude of the Krem water absorption of each of the laminated sheet members is adjusted. Krem water absorption is expressed by the height (mm) of water rising in 10 minutes by capillarity when the lower end of the paper is vertically immersed in water (see JIS P 8141: 2004). The higher the seat member, the easier it is to draw in liquid. That is, it is easy for the liquid to permeate.

As the sheet member constituting the top sheet 22, an air-through non-woven fabric having a basis weight of 30 g / m2 can be exemplified. Further, as a sheet member constituting the second sheet 35 laminated on the non-skin side of the top sheet 22, a mixed fiber of rayon and pulp having a basis weight of 35 g / m2 can be exemplified. Further, as a sheet member constituting the core wrap sheet 25 laminated on the non-skin side of the second sheet 35, an SMS non-woven fabric having a basis weight of 10 g / m2 can be exemplified.

In the present embodiment, the creme water absorption of each sheet member is adjusted so that the creme water absorption of the second sheet 35 and the core wrap sheet 25 is larger than the creme water absorption of the top sheet 22. That is, the Krem water absorption of the sheet member provided between the top sheet 22 and the stool indicator 40 is larger than the Krem water absorption of the top sheet 22. Therefore, when stool is excreted on the skin side of the top sheet 22, the water (stool juice) contained in the stool is drawn to the non-skin side by the second sheet 35 and the core wrap sheet 25, and the stool indicator 40 is drawn from the top sheet 22. It becomes easy to see through. Since ordinary stool is in a state in which particles and stool juice are mixed (emulsion state), it is difficult for the non-woven fabric such as the top sheet 22 to permeate. However, as in the present embodiment, by increasing the Krem water absorption of the sheet members (25, 35) provided on the non-skin side of the top sheet 22, the moisture in the stool smoothly permeates the top sheet 22. become able to.

When the Krem water absorption of the top sheet 22 is larger than the Krem water absorption of the second sheet 35 and the core wrap sheet 25, it is difficult for the force to draw stool (stool juice) to act on the non-skin side of the top sheet 22. Therefore, the stool (stool juice) does not permeate the top sheet 22, and the top sheet 22 itself absorbs and diffuses the stool. Therefore, it becomes difficult for the stool (stool juice) to reach the stool indicator 40, and the stool detection accuracy is lowered.

Further, in the present embodiment, the Krem water absorption of the second sheet 35 is larger than the Krem water absorption of the core wrap sheet 25. As described above, the second sheet 35 needs to exert a function of strongly drawing the water (stool juice) contained in the stool from the top sheet 22 to the non-skin side. Therefore, it is desirable that the Krem water absorption of the second sheet 35 is as large as possible. On the other hand, since the core wrap sheet 25 only needs to draw the stool juice from which the particles have been removed through the top sheet 22 to the non-skin side, it is not necessary to draw the stool juice as strongly as the second sheet 35, and the Krem water absorption degree. Does not need to be large. On the contrary, if the Krem water absorption of the core wrap sheet 25 is excessively large, the stool juice drawn into the core wrap sheet 25 diffuses to the surface of the core wrap sheet, making it difficult to reach the stool indicator 40. Therefore, in the present embodiment, the Krem water absorption of the core wrap sheet 25 is made smaller than the Krem water absorption of the second sheet 35.

FIG. 4 is a table showing the results of a verification experiment on the relationship between the magnitude of the Krem water absorption of each sheet member and the reactivity of the stool indicator 40. In the experiment, first, the Krem water absorption evaluation test was carried out by a method according to JIS P 8141: 2004, and the Krem water absorption was measured for each sheet member of the top sheet 22, the second sheet 35, and the core wrap sheet 25. Specifically, a plurality of test pieces (for example, 10 pieces) having a width of 15 ± 1 mm and a length of 150 mm or more are collected from the sheet members 22, 35, 25, and placed at a position 10 mm from the short side of each test piece. A marked line is provided parallel to the short side, and a clip or weight is attached to the area between the short side and the marked line. Then, the end opposite to the area where the clip or the like is attached in the long side direction is attached to the hanging tool, the test piece is placed in the immersion container filled with the liquid up to the marked line, and the liquid rises after 1 minute. Measure the height. The liquid used for the measurement is artificial stool, which measures the Krem water absorption degree (stool Krem water absorption degree) for the stool. As an example, artificial stool contains ion-exchanged water: 73%, NaCl: 1%, glycerin: 13.9%, NaCMC: 2%, cellulose 10%, and colored powder 0.1%, and has a viscosity of 2000 mPa · S. I used the adjusted one. In this experiment, when the diaper 1 was actually worn, the time required for the excreted stool (stool juice) to reach the stool indicator 40 was taken into consideration, and the measurement time for the liquid rise was set to 1 minute later. There is. This is because if a time of 1 minute or more elapses, the stool becomes easy to dry, and after that, it becomes difficult for the stool (stool juice) to reach the stool indicator 40, and it may be difficult to detect defecation. However, the size of the test piece, the time for immersing the test piece, and the like may be changed in consideration of the usage situation of the diaper 1.

The fecal creme water absorption of each sheet member was 7 mm for the top sheet 22, 45 mm for the second sheet 35, and 11 mm for the core wrap sheet 25. That is, it was confirmed that the stool Krem water absorption decreased in the order of the second sheet 35, the core wrap sheet 25, and the top sheet 22. When the test was conducted using water (urine) as the liquid, the Krem water absorption of each sheet member showed the same tendency.

Subsequently, these sheet members 22, 25, 35 are laminated in the thickness direction, 5 g of artificial stool is placed on the most skin side in the thickness direction, and the stool indicator 40 is placed on the most non-skin side in the thickness direction. To do. Then, after 5 minutes had passed, the size of the region where the stool indicator 40 showed a color reaction (the length of the indicator in the longitudinal direction) was measured. Then, the reactivity of the stool indicator 40 was verified in the cases of conditions 1 to 3 in which the order in which the sheet members 22, 25, and 35 were laminated was changed.

Condition 1 is a case where the top sheet 22, the second sheet 35, and the core wrap sheet 25 are laminated in this order from the skin side in the thickness direction as in the present embodiment. In this case, the range of the color reaction of the stool indicator 40 (the distance between A and B in the photograph of FIG. 4) was the widest, and it became clear that stool was easy to detect. This is because, as described above, the second sheet 35 draws in the stool from the top sheet 22, and the core wrap sheet 25 allows the stool to penetrate to the stool indicator 40 to the extent that the stool is not diffused.

Condition 2 is a case where the arrangement of the second sheet 35 and the core wrap sheet 25 is exchanged. That is, the top sheet 22 having the lowest Krem water absorption is placed on the skin side most, and the second sheet 35 having the highest Krem water absorption is placed on the non-skin side. In this case, the reaction range of the stool indicator 40 was narrower than that of condition 1, and it became clear that it was difficult to detect stool as compared with condition 1. This is because the Krem water absorption of the core wrap sheet 25 laminated on the non-skin side of the top sheet 22 is not sufficiently large, so that the stool juice is weakly drawn from the top sheet 22 to the core wrap sheet 25, and a sufficient amount is used. This is because the stool juice did not penetrate to the stool indicator 40.

Condition 3 is a case where the second sheet 35 having the highest Krem water absorption is placed on the skin side most, and the top sheet 22 having the lowest Krem water absorption is placed on the non-skin side. In this case, the reaction range of the stool indicator 40 was the narrowest, and it became clear that stool could hardly be detected. This is because the degree of Krem water absorption by the second sheet 35 on the skin side was too large, and the stool hardly penetrated into the non-skin side.

From these experimental results, by adjusting the Krem water absorption of each of the sheet members 22, 35, and 25 as in the present embodiment, the excreted stool can easily reach the stool indicator 40, and the stool can be accurately delivered. It became clear that it could be detected.

Further, as shown in FIG. 1, the second sheet 35 and the core wrap sheet 25 have a portion overlapping with the stool indicator 40 in the longitudinal direction and the width direction of the diaper 1. In this case, the stool (stool juice) drawn from the skin side surface of the top sheet 22 to the non-skin side in the thickness direction by the second sheet 35 and the core wrap sheet 25 permeates the non-skin side in the thickness direction as it is. It becomes easier to come into direct contact with the stool indicator 40. This makes it easier for the stool indicator 40 to detect stool.

Further, as shown in FIG. 1, in the longitudinal direction, the center of the second seat 35 is located on the rear side (dorsal side) of the center of the diaper 1 (the position of BB in FIG. 1). That is, the second sheet 35 is arranged closer to the rear side in the longitudinal direction. Therefore, when the diaper 1 is worn, the second sheet 35 is likely to be arranged on the buttocks side (that is, near the anus) of the wearer, and the discharged stool can be quickly drawn to the non-skin side. This makes it easier for the stool (stool juice) to reach the stool indicator 40.

Further, in the longitudinal direction, the front end of the second seat 35 is located on the rear side (dorsal side) of the center of the diaper 1 (position of BB in FIG. 1). The diaper 1 is folded in half in the longitudinal direction at the center position in the longitudinal direction (BB in FIG. 1) when worn. That is, the center position in the longitudinal direction of the diaper 1 is the bending position of the diaper 1. If the second sheet 35 overlaps the center position of the diaper 1 in the longitudinal direction, the second sheet 35 is also bent in the longitudinal direction when the diaper 1 is worn, and the joint with the top sheet 22 is peeled off. There is. When the top sheet 22 and the second sheet 35 are peeled off, the drawing of stool juice from the top sheet 22 to the second sheet 35 is hindered at the portion where the peeling occurs, and the stool juice may be difficult to reach the stool indicator 40. is there. On the other hand, in the present embodiment, since the center of the diaper 1 and the second sheet 35 do not overlap, the second sheet 35 is less likely to bend and peeling from the top sheet 22 is less likely to occur. Therefore, it is possible to reduce the difficulty of the stool juice reaching the stool indicator 40.

<About the structure of absorber 21>
As described above, in the diaper 1 of the present embodiment, the stool indicator 40 is arranged on the non-skin side of the absorber 21 to detect the stool, but the stool is usually highly viscous and has low fluidity. , It is difficult for the absorber 21 to permeate in the thickness direction. Therefore, when the stool indicator 40 is provided on the non-skin side of the absorber 21, stool may be difficult to reach the stool indicator 40.

On the other hand, in the present embodiment, the absorber 21 has a low basis weight portion 21A in the central portion in the width direction (see FIG. 2). In the low basis weight portion 21A, the basis weight is lower than the basis weight of the regions 21B and 21B adjacent to the low basis weight portion 21A from the outside in the width direction. Here, the basis weight is the mass per unit area. The basis weight of the low basis weight portion 21A of the present embodiment, it is more preferable is preferably about 0 to 200 g / m ^2, is about 100 g / m ^2. The basis weight of each of the adjacent regions 21B is preferably about ^{370 g / m 2.} If the basis weight ^{of the low basis weight portion 21A exceeds 200 g / m 2} , the basis weight is too high and it becomes difficult for the stool to pass through the low basis weight portion 21A.

Then, as shown in FIG. 1, the stool indicator 40 of the present embodiment is arranged so as to have a portion overlapping with the low basis weight portion 21A in the longitudinal direction and the width direction. With such a configuration, the stool (stool juice) excreted in the diaper 1 passes through the low basis weight portion 21A of the absorber 21 and moves from the skin side to the non-skin side, and easily reaches the stool indicator 40. .. Therefore, the detectability of stool by the stool indicator 40 can be further enhanced.

The basis weight of the low basis weight portion 21A may be zero. FIG. 5 is a partially enlarged cross-sectional view showing another configuration of the low basis weight portion 21A (absorbent core 24). As shown in FIG. 5, the low basis weight portion 21A may have a region 21C (hereinafter, also referred to as “slit 21C”) in which the basis weight is zero, at least in the central portion in the width direction. By providing the region 21C (slit 21C) having zero basis weight in the central portion of the low basis weight portion 21A in the width direction, the moisture of the stool is drawn into the lower layer in the thickness direction by passing through the region 21C. It becomes. By improving the pullability to the lower layer, the reactivity of the stool indicator 40 can be improved as a result.

In the present embodiment, the stool indicator 40 is arranged between the low basis weight portion 21A of the absorber 21 and the back sheet 23 in the thickness direction. Then, in the region corresponding to the low basis weight portion 21A in the width direction, the top sheet 22, the second sheet 35, the second sheet 35 and the core wrap sheet 25, and the core wrap sheet 25 and the back sheet 23 are joined in the thickness direction, respectively. Has been done. As for the joining method, a method of applying and fixing a hot melt adhesive or the like by a known coating method such as a coater spray method, a spiral spray method, an omega spray method, a curtain spray method, an ultrasonic welding (sonic seal) method, etc. Can be mentioned.

Further, as shown in FIG. 5, when the low basis weight portion 21A has a slit 21C at least in the central portion in the width direction, the top sheet 22, the second sheet 35, the core wrap sheet 25, and the back sheet 23 May be joined in the thickness direction. At that time, in the core wrap sheet 25, the skin side portion 25a covering the skin side surface of the absorbent core 24 and the non-skin side portion 25b covering the non-skin side surface are formed in a region corresponding to the slit 21C in the width direction. It is preferable that they are joined in the thickness direction.

In this way, by joining the above-mentioned sheets adjacent to each other in the thickness direction in the region corresponding to the low basis weight portion 21A or the slit 21C in the width direction, no space is generated in the thickness direction between the sheets. It is possible to improve the ability of stool to draw in water to the non-skin side in the thickness direction.

Further, as for the bonding strength in the low basis weight portion 21A between the sheets, it is preferable that the bonding strength between the second sheet 35 and the core wrap sheet 25 is higher than the bonding strength between the top sheet 22 and the second sheet 35. Normally, large particles and water are mixed in the stool, but in the top sheet 22 where the stool is the most difficult to permeate in the state where the particles and water are mixed, the density of the adhesive such as hot melt adhesive By lowering the temperature, it is difficult to prevent the stool from passing through the top sheet 22. On the other hand, since the moisture of the stool filtered from the top sheet 22 permeates the second sheet 35, the density of the adhesive such as the hot melt adhesive that joins the second sheet 35 and the core wrap sheet 25 is increased. Even so, it does not inhibit penetration.

=== Other embodiments ===
Although the embodiments of the present invention have been described above, the above-described embodiments are for facilitating the understanding of the present invention, and are not for limiting the interpretation of the present invention. Further, the present invention can be changed or improved without departing from the spirit thereof, and it goes without saying that the present invention includes an equivalent thereof.

In the above embodiment, the second sheet 35 is arranged between the top sheet 22 and the core wrap sheet 25 in the thickness direction, but a diffusion sheet that diffuses the liquid between the absorber 21 and the stool indicator 40. It may be arranged as. By doing so, the water content of the stool that has passed through the low basis weight portion 21A can be diffused in the lower layer of the absorber 21, and the stool indicator 40 can react in a wider range. Thereby, the visibility from the outer surface of the diaper 1 can be improved.

Further, the top sheet 22 may have an opening. By having the opening, the contact area between the second sheet 35 and the stool can be increased, and the permeability of the stool to the second sheet 35 can be improved.

Further, in the above-described embodiment, the shape of the low basis weight portion 21A is a rectangular shape that is long in the longitudinal direction in the plan view shown in FIG. 1, but the shape is not limited to this. For example, a pattern shape such as a square, a rectangle long in the width direction, or a heart shape may be used.

Further, in the above-described embodiment, the number of the low basis weight portions 21A is one in the central portion in the width direction of the diaper 1, but a plurality of low basis weight portions 21A may be provided. In this case, the detection of defecation can be further improved by arranging a plurality of stool indicators 40 so as to have overlapping portions in the longitudinal direction and the width direction with respect to each low basis weight portion 21A.

Further, in the above-described embodiment, it has been described that the stool (stool juice) can be easily drawn into the stool indicator 40 by adjusting the Krem water absorption of the top sheet 22, the second sheet 35, and the core wrap sheet 25. Such a configuration is also effective for absorbent articles that do not include the stool indicator 40. For example, as in the above-described embodiment, by reducing the Krem water absorption of the top sheet 22 and increasing the Krem water absorption of the second sheet 35, the urine excreted in the top sheet 22 is transferred to the surface of the top sheet 22. The second sheet 35 and the core wrap sheet 25 can be pulled into the non-skin side without being diffused, and can be easily absorbed by the absorber 21. As a result, while suppressing the rewetting of the top sheet 22, water such as urine is absorbed by the absorber 21, and it is possible to suppress skin irritation and stuffiness of the wearer when wearing the absorbent article.

1 Tape-type disposable diapers (absorbent articles)
3 Front 5 Inseam 7 Rear 12 Central band area 14 Side flap 15 Leg gather elastic member 16 Leg gather 17 Leg side gather 18 Leg side gather Elastic member 21 Absorber 21A Low basis weight part 21B area (non-low basis weight part)
21C slit (area where the basis weight is zero)
22 Top sheet 23 Back sheet 24 Absorbent core 25 Core wrap sheet 26 Skin side sheet 26A Joint 27 Exterior sheet 28 Leg circumference elastic member 29 Target tape 30 Fastening tape 35 Second sheet 40 Stool indicator 50 Urine indicator

Claims (13)

It has a longitudinal direction, a width direction, and a thickness direction in the unfolded state.
Absorbents with a liquid-absorbing absorbent core and
A top sheet provided on the skin side in the thickness direction of the absorber and
A stool indicator provided on the non-skin side in the thickness direction of the absorber and exhibiting a predetermined reaction when in contact with stool.
It is an absorbent article having
In the thickness direction, a second sheet is arranged between the top sheet and the stool indicator.
It has a core wrap sheet that covers the absorbent core from the skin side and the non-skin side in the thickness direction.
The second sheet is located on the skin side in the thickness direction of the core wrap sheet on the skin side.
The Krem water absorption of the second sheet is larger than the Krem water absorption of the top sheet.
An absorbent article characterized in that the Krem water absorption of the second sheet is larger than the Krem water absorption of the core wrap sheet. The absorbent article according to claim 1.
An absorbent article characterized in that, in the longitudinal direction, the center of the second sheet is located posterior to the center of the absorbent article. The absorbent article according to claim 2.
An absorbent article characterized in that, in the longitudinal direction, the front end of the second sheet is located posterior to the center of the absorbent article. The absorbent article according to any one of claims 1 to 3.
An absorbent article comprising a portion where the second sheet or the core wrap sheet and the stool indicator overlap in the longitudinal direction and the width direction. The absorbent article according to any one of claims 1 to 4.
The absorber has a low basis weight portion in the central portion in the width direction.
The basis weight of the low basis weight portion is lower than the basis weight of the region adjacent to the low basis weight portion from the outside in the width direction.
An absorbent article characterized in that the low basis weight portion and the stool indicator have overlapping portions in the longitudinal direction and the width direction. The absorbent article according to claim 5.
A back sheet provided on the non-skin side in the thickness direction of the absorber is provided.
The stool indicator is arranged between the low basis weight portion of the absorber and the backsheet in the thickness direction.
An absorbent article characterized in that, in the width direction, the top sheet and the second sheet are joined in the thickness direction in a region corresponding to the low basis weight portion. The absorbent article according to claim 6.
An absorbent article characterized in that, in the width direction, the second sheet and the core wrap sheet are joined in the thickness direction in a region corresponding to the low basis weight portion. The absorbent article according to claim 7.
An absorbent article characterized in that, in the width direction, the core wrap sheet and the back sheet are joined in the thickness direction in a region corresponding to the low basis weight portion. The absorbent article according to any one of claims 5 to 8.
The absorbent article, characterized in that the low basis weight portion has a region where the basis weight is zero at least in the central portion in the width direction. The absorbent article according to claim 9.
A back sheet provided on the non-skin side in the thickness direction of the absorber is provided.
In the width direction, the top sheet, the second sheet, the core wrap sheet, and the back sheet are joined in the thickness direction in a region corresponding to the region where the basis weight is zero. , An absorbent article characterized by that. The absorbent article according to claim 10.
The core wrap sheet has a skin side portion that covers the skin side surface of the absorbent core and a non-skin side portion that covers the non-skin side surface.
In the width direction, the skin side portion and the non-skin side portion of the core wrap sheet are joined in the thickness direction in a region corresponding to the region where the basis weight is zero. Absorbent article. The absorbent article according to any one of claims 1 to 11.
An absorbent article characterized in that, in the longitudinal direction, the center of the stool indicator is located posterior to the center of the absorbent article. The absorbent article according to any one of claims 1 to 12.
The stool indicator has an area located posterior to the longitudinal center of the absorbent article than an area located anterior to the longitudinal center of the absorbent article. An absorbent article characterized by that.