JP2020081343A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article in which excreted stool can easily reach an indicator. SOLUTION: The top sheet (22) has a longitudinal direction, a width direction and a thickness direction in a deployed state, and is provided on an absorber (21) and a skin side in a thickness direction from the absorber (21). An absorbent article (1) having a stool indicator (40) provided on the non-skin side in the thickness direction of the absorber (21) and exhibiting a predetermined reaction when in contact with stool. In the thickness direction, one or more sheet members are arranged between the top sheet (22) and the stool indicator (40), and the Krem water absorption of the sheet members is the Krem water absorption of the top sheet (22). Greater than. [Selection diagram] Fig. 2

Description

The present invention relates to absorbent articles.

A disposable diaper is known as an example of an absorbent article. Some such disposable diapers have an indicator function for visualizing the amount of excrement absorbed and informing the user of the replacement time. For example, in Patent Document 1, a urination indicator that changes color by contact with urine is provided between the absorber of the diaper and the back sheet, and the exterior nonwoven fabric is compacted at a portion overlapping with the urine indicator. , A disposable diaper with improved visibility of the indicator is disclosed.

JP, 2012-100886, A

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

The present invention has been made in view of the above conventional problems, and an object thereof is to provide an absorbent article that allows excrement of feces to easily reach an indicator.

The main invention for achieving the above object is to have a longitudinal direction, a width direction, and a thickness direction in a developed state, and an absorber, and a topsheet provided on the skin side of the absorber in the thickness direction. An absorbent article having a stool indicator provided on the non-skin side in the thickness direction with respect to the absorbent body, and exhibiting a predetermined reaction by contact with stool, in the thickness direction, One or more sheet members are arranged between the topsheet and the stool indicator, and the Klemm water absorption of the sheet member is larger than the Klemm water absorption of the topsheet. It is an article.

Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

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

It is a top view in the state where the diaper 1 was expanded and extended. It is sectional drawing in line AA shown in FIG. It is a figure shown about the modification of the stool indicator 40 and the urine indicator 50. 6 is a table showing the results of a verification experiment on the relationship between the degree of Klemm water absorption of each sheet member and the reactivity of the stool indicator 40. It is a partial expanded sectional view which shows another structure of 21 A of low basic weight parts (absorbent core 24).

At least the following matters will be made clear by the present specification and the description of the accompanying drawings.
Having a longitudinal direction, a width direction, and a thickness direction in the expanded state, an absorber, a top sheet provided on the skin side in the thickness direction with respect to the absorber, and the thickness direction with respect to the absorber. An absorbent article having a non-skin side provided with a stool indicator that exhibits a predetermined reaction by contacting stool, and in the thickness direction, between the top sheet and the stool indicator. One or more sheet members are arranged, and the Klemm's water absorption of the sheet member is larger than the Klemm's water absorption of the top sheet.

According to such an absorbent article, when feces are excreted on the skin side of the top sheet, the water contained in the feces is drawn to the non-skin side by the sheet member having a high Klemm's water absorption rate, and the feces indicator from the top sheet. It becomes easy to permeate to the side. Therefore, the stool can be easily reached to the stool indicator.

In the absorbent article, the sheet member is preferably a second sheet provided between the top sheet and the absorber in the thickness direction.

According to such an absorbent article, the water contained in the stool is drawn into 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 flight to reach the indicator.

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

According to such an absorbent article, the water contained in the stool is easily 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 flight to reach the indicator.

In such an absorbent article, it is desirable that the second sheet has a higher Klemm water absorption than the core wrap sheet.

According to such an absorbent article, it is possible to strongly draw only water (feces juice) from the top sheet to the non-skin side from feces in a state where particles and feces juice are mixed. Further, it is possible to suppress the diffusion of fecal juice in the core wrap sheet. Therefore, the water contained in the stool can be made to reach the stool indicator, and the stool can be easily detected.

In such an absorbent article, it is desirable that the center of the second sheet is located rearward of 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 wearer's buttocks side (that is, near the anus), so that the discharged feces are 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 a front side end of the second sheet is located rearward of a 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 during wearing, the second sheet is unlikely to bend, and the second sheet is prevented from peeling from the top sheet. Therefore, drawing of the feces juice from the top sheet to the second sheet is not easily obstructed, and the feces juice can easily reach the feces indicator.

In such an absorbent article, it is desirable that the sheet member and the stool indicator have a overlapping portion in the longitudinal direction and the width direction.

According to such an absorbent article, the stool (feces 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 in the thickness direction. Penetration to the non-skin side of the and facilitates direct contact with the stool indicator. As a result, the accuracy of stool detection by the stool indicator can be improved.

In the absorbent article, the absorber has a low basis weight portion in the center 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 preferable that the low grammage portion has a portion that is lower than the grammage of the adjacent regions and that the low grammage portion and the stool indicator overlap in the longitudinal direction and the width direction.

According to such an absorbent article, feces (feces juice) permeate the low basis weight portion of the absorbent body, move from the skin side to the non-skin side, and easily reach the feces indicator. Therefore, the detectability of the stool by the stool indicator can be further enhanced.

Such an absorbent article, a second sheet provided on the non-skin side in the thickness direction with respect to the top sheet, and a back sheet provided on the non-skin side in the thickness direction with respect to the absorber, The stool indicator is arranged between the low basis weight portion of the absorber and the back sheet in the thickness direction, and in a region corresponding to the low basis weight portion in the width direction. It is preferable that the top sheet and the second sheet are joined in the thickness direction.

According to such an absorbent article, in the area corresponding to the low basis weight portion, by joining the top sheet and the second sheet, a space does not occur in the thickness direction between the top sheet and the second sheet, and the thickness It is possible to improve the ability of faeces to draw moisture toward the non-skin side.

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

According to such an absorbent article, a space is generated in the thickness direction between the second sheet and the core wrap sheet by joining the second sheet and the core wrap sheet in the region corresponding to the low basis weight portion. In addition, it is possible to improve the ability of faecal water to be drawn into 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 a region corresponding to the low basis weight portion in the width direction.

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

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

According to such an absorbent article, by providing a region where the basis weight is zero in the low basis weight portion, faecal water easily penetrates the region where the basis weight is zero and is more easily drawn into the lower layer. By improving the retractability to the lower layer, the reaction of the stool indicator can be enhanced.

Such an absorbent article, a second sheet provided on the non-skin side in the thickness direction with respect to the top sheet, and a back sheet provided on the non-skin side in the thickness direction with respect to the absorber, The absorbent body has an absorbent core and a core wrap sheet that covers the skin side surface and the non-skin side surface of the absorbent core, and corresponds to a region in which 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, a space is not created between the sheets in the thickness direction, and the ability of faecal water to be drawn toward the non-skin side in the thickness direction can be improved.

In the absorbent article, the core wrap sheet has a skin side portion covering a skin side surface of the absorbent core and a non-skin side portion covering a non-skin side surface, and in the width direction, the basis weight is 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 a region corresponding to a region of zero.

According to such an absorbent article, a space is not formed in the thickness direction between the skin side portion and the non-skin side portion of the core wrap sheet, and the ability to draw the moisture of feces to the thickness direction non-skin side is reduced. Can be improved.

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

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

In such an absorbent article, the stool indicator has an area arranged rearward of a center of the absorbent article in the longitudinal direction and arranged in a front side of a center of the absorbent article in the longitudinal direction. It is desirable that the area is larger than the area.

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

=== Embodiment ===
As an 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 or 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 a developed and expanded state. FIG. 2 is a sectional view taken along the line AA shown in FIG. The stretched state of the diaper 1 is a stretched state in which the wrinkles formed on the diaper 1 become 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 single member.

The diaper 1 of the present embodiment is a so-called open type disposable diaper, and as shown in FIG. 1, has a front part 3, a crotch part 5, and a rear part 7. The front part 3 is a part to be located on the front part (ventral side, front waistline) of the wearer. Moreover, the rear part 7 is a part which will be located in a rear part (back side, a back waistline) of a wearer. The crotch portion 5 is a portion to be located between the front portion 3 and the rear portion 7.

In the following description, each direction is defined as shown in FIG. That is, in the diaper 1 in the stretched state, the direction from the front part 3 to the rear part 7 is the “longitudinal direction”, and the direction orthogonal to the longitudinal direction is the “width direction”. The line BB shown in FIG. 1 is a line showing the center of the diaper 1 in the longitudinal direction. In addition, as shown in FIG. 2, the direction orthogonal to the longitudinal direction and the width direction is the "thickness direction", the side of the wearer's skin is the "skin side", and the opposite side is 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. A 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 that is located in the central portion in the width direction formed by the front portion 3, the crotch portion 5, and the rear portion 7 (see FIG. 1 ). The central band-shaped region 12 is a part that absorbs and holds liquid such as urine excreted by the wearer. The central band-shaped region 12 has a vertically long shape (a shape along the longitudinal direction) that includes the liquid retaining absorbent body 21. The central band-shaped region 12 is mainly composed of an absorbent body 21, a liquid-permeable topsheet 22 that covers the absorbent body 21 from the skin side, and a liquid-impermeable backsheet 23 that covers the absorbent body 21 from the non-skin side. , And an exterior sheet 27 (for example, non-woven fabric) that forms the exterior of the diaper 1 (see FIG. 2 ). The central strip 12 is further provided with a second sheet 35 that is liquid-permeable.

As shown in FIG. 2, the absorbent body 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. It has a liquid-permeable core wrap sheet 25.

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

The side flaps 14 are portions located on both sides of the central strip-shaped region 12 in the width direction. The side flaps 14 are formed over the front portion 3, the crotch portion 5, and the rear portion 7 (see FIG. 1). The length (width) of the side flaps 14 in the crotch portion 5 in the width direction is smaller than the length (width) of the side flaps 14 in the front portion 3 and the rear portion 7 in the width direction. 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 member on the skin side formed over the front portion 3, the crotch portion 5, and the rear portion 7, and is made of, for example, a nonwoven fabric. The skin side sheet 26 is also a member that constitutes the leg side gathers 17 (three-dimensional gathers), and a portion outside the skin side sheet 26 (a portion outside the joint portion 26A indicated by the broken line in FIG. 1) is the side flap 14. Make up.

At least in the crotch region 5 of the central band-shaped region 12, between the absorber 21 and the back sheet 23, a pair of elastic members 28 around the leg (for example, rubber thread) that can expand and contract in the longitudinal direction is provided. The leg elastic members 28 are members that impart elasticity to the central band-shaped region 12 of the crotch portion 5. In the present embodiment, the leg-surrounding elastic member 28 is attached in a state of being elongated in the longitudinal direction. As a result, the leg elastic members 28 exert a contracting force along the longitudinal direction on the crotch portion 5 of the central band-shaped region 12.

The pair of side flaps 14 are provided with leg gather elastic members 15 that expand and contract in 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 openings when the diaper 1 is worn. That is, the leg gather elastic member 15 is a leg elastic member that fits the leg run portion of the diaper 1 to the wearer's leg. Further, the leg gathers 16 are configured by the leg gather elastic members 15 imparting elasticity to the skin side sheet 26 and the back sheet 23 of the crotch portion 5.

The leg side gathers 17 are three-dimensional gathers for preventing the liquid from leaking from the clearance between the legs. The pair of leg side gathers 17 are formed along the longitudinal direction over the front portion 3, the crotch 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 gathers 17 (three-dimensional gathers) are mainly composed of a portion on the inner side in the width direction of the skin side sheet 26 (see FIG. 2 ). The inner edge of the skin-side sheet 26 of the crotch portion 5 has elasticity due to the leg side gather elastic member 18 such as thread rubber. The skin-side sheet 26 is joined along the longitudinal direction at a joining portion 26A between the central strip 12 and the side flap 14. When the diaper 1 is worn, due to the elasticity of the leg-side gather elastic member 18, the region inside the joint portion 26A of the skin-side sheet 26 rises to the wearer's skin side with the joint portion 26A as the base point, and the excrement or the like is discharged laterally. Control leakage.

The fastening tapes 30 are arranged on both sides of the side flap 14 in the width direction in the rear portion 7 of the diaper 1 (see FIG. 1 ). Then, by locking each fastening tape 30 to a target tape 29 (FIG. 1) described later, a waist opening and leg openings 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 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 made of, for example, non-woven fabric. The target tape 29 constitutes a target area for engaging the fastening tape 30. 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 outermost non-woven fabric forming the back sheet 23. Then, the diaper 1 is worn by engaging the fastening tape 30 with the target tape 29.

The diaper 1 of the present embodiment has a stool indicator 40 in the center portion in the width direction of the diaper 1, and further has a pair of urine indicators 50 spaced apart from the stool indicator 40 in the width direction outside. 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. The urine indicator 50 is configured as an indicator including a pH indicator that is adopted in a conventional general diaper. For example, the urine indicator 50 detects that urine is excreted by exhibiting a predetermined reaction (for example, a color reaction) by contacting urine with the pH of urine as a reaction factor (urine indicator reaction factor). .. Details of the flight indicator 40 will be described later.

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

For example, when the biological substance detected by the chemical component contained in the stool indicator 40 is a protein, it is preferable to use a pH indicator as the chemical component. In general, a protein has a structure in which amino acids are polymerized, and since it has acidic and basic functional groups at both ends and side chains of the main chain of the protein, when a certain amount of protein or more is present, The pH indicator can be changed in color (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, when a protein is present, it binds to a 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 stool, the color changes from yellow to blue. In addition, in order to easily cause discoloration of the pH indicator, it is desirable to preliminarily set it to an acidic side of about pH 3. Therefore, the pH indicator may include a citrate buffer or the like.

As described above, by using the predetermined pH indicator, the pH indicator does not become colored due to the pH change of urine or feces 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 tetraphenol blue, and other pH indicators can be used. For example, bromophenol blue, bromocresol green, thymolphthalein, or the like, or another indicator can be used. Furthermore, it is desirable that the pH indicator is safe for the skin and has excellent storage stability in the presence of 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 to urine so as to prevent false detection of 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 more, and when the stool indicator reaction factor is smaller than the predetermined concentration, The reaction is difficult to occur.

In general, urine of a healthy person does not contain a protein, and even a non-healthy person has a protein content of less than 10,000 mg/L in urine. Therefore, in the present embodiment, it is preferable that the stool indicator 50 responds to a protein of 150 mg/L or more, and more preferably a protein of 5,000 mg/L or more by the protein error method using a pH indicator. It is more preferable to respond to 10,000 mg/L or more of protein. For example, when the stool indicator 50 responds to a protein of 150 mg/L or more under the condition of using bromophenol blue as a chemical component, the application amount of the pH indicator per 1 cm 2 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 more, the applied amount of the pH indicator per 1 cm 2 in the stool indicator 50 is preferably 0.5 μg, and the stool indicator 50 has 10,000 mg/L. When responding to L or more proteins, the applied amount of the pH indicator per cm 2 of the stool indicator 50 is preferably 0.25 μg. By setting the applied amount of the pH indicator to be 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 manner, the range in which the stool indicator 40 can react with stool is relatively smaller than the range in which the stool indicator 40 can react with stool. be able to. In other words, the reaction of the stool indicator 40 on stool and the reaction of the stool indicator 40 on urine can be made different. This makes it difficult for the stool indicator 40 to react with urine.

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

The stool indicator 40 is formed by applying an adhesive (for example, a hot melt adhesive HMA) containing the above-mentioned chemical component (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 applied to a strip-shaped (or linear) region along the longitudinal direction from the crotch portion 5 to the rear portion 7 at the center in the width direction by using a coater. The stool indicator 40 is formed by applying (HMA). According to such coater coating, it becomes possible to form the stool indicator 40 having a uniform film thickness and less unevenness, and the stool detection accuracy can be improved. Further, the manufacturing cost can be suppressed. The urine indicator 50 can be formed in the same manner.

Alternatively, the stool indicator 40 may be formed by mixing a chemical component with ink and printing-coating the back sheet 23 or the core wrap sheet 25. Further, the stool indicator 40 is formed by joining and fixing a filter paper or a non-woven fabric impregnated with a chemical component to the back sheet 23 or the core wrap sheet 25 with a 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 having different patterns, instead of the band-shaped pattern 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 pattern patterns, it becomes easy to visually distinguish defecation and urination from the outside of the diaper 1 and cause misidentification by the user. Can be hardened.

Further, the stool indicator 40 may be formed in a pattern and the urine indicator 50 may be formed in a strip pattern. On the contrary, the stool indicator 40 may be formed in a striped pattern and the urine indicator 50 may be formed in a pattern. Even in such a case, the appearance difference between the stool indicator 40 and the urine indicator 50 becomes clear, so that 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 (back side) in the longitudinal direction. In other words, the stool indicator 40 is arranged such that the center of the stool indicator 40 is located rearward of the center of the diaper 1 (the position of line BB in FIG. 1) in the longitudinal direction. With this arrangement, the position of the stool indicator 40 and the wearer's anus (buttock) are close to each other in the longitudinal direction. Therefore, excreted feces can easily reach the feces indicator 40, and the feces detection accuracy can be further improved.

Further, in the stool indicator 40, the area arranged on the rear side (dorsal side) of the center in the longitudinal direction (position of line BB in FIG. 1) is on the front side (ventral side) of the center in the longitudinal direction. It is desirable that the area is larger than the area arranged in. That is, it is desirable that the stool indicator 40 is provided so that the area of the rear side is larger than that of the front side in the longitudinal direction. By doing so, it is possible to widen the range in which the stool can be detected by the stool indicator 40 in the region near the anus of the wearer (that is, the rear side in the longitudinal direction). Therefore, the stool detection accuracy can be further improved.

<About stool permeability>
In order to detect a stool with the stool indicator 40, it is necessary to bring water (stool juice) contained in the stool into contact with the stool indicator 40. Therefore, it is necessary to allow feces (feces juice) excreted in the top sheet 22 provided on the most skin side of the diaper 1 to reach the feces indicator 40 provided on the back sheet 23. That is, it is necessary to allow the sheet member provided on the skin side in the thickness direction of the stool indicator 40 to pass therethrough so that stool (feces juice) reaches the stool indicator 40.

In the diaper 1, as shown in FIG. 2, at least three sheet members of a top sheet 22, a second sheet 35, and a core wrap sheet 25 are laminated on the skin side of the stool indicator 40 in the thickness direction. .. In the present embodiment, it is easy to make the stool (feces juice) reach the stool indicator 40 by appropriately adjusting the ease of permeation of liquid (feces juice or urine) in each of these sheet members 22, 35, 25. is doing. Specifically, the magnitude of the Klemm water absorption of each laminated sheet member is adjusted. The Klemm water absorption is represented by the height (mm) in which the lower end of the paper is vertically immersed in water and the water rises in 10 minutes by capillary action (see JIS P 8141:2004). The higher the sheet member, the easier it is to draw in liquid. That is, the liquid easily penetrates.

An example of the sheet member that constitutes the top sheet 22 is an air-through nonwoven fabric having a basis weight of 30 g/m 2. Further, as the 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/m 2 can be exemplified. Further, as the sheet member constituting the core wrap sheet 25 laminated on the non-skin side of the second sheet 35, an SMS nonwoven fabric having a basis weight of 10 g/m 2 can be exemplified.

In the present embodiment, the Klemm water absorbency of each sheet member is adjusted so that the Klemm water absorbency of the second sheet 35 and the core wrap sheet 25 is larger than the Klemm water absorbency of the top sheet 22. That is, the Klemm's water absorption of the sheet member provided between the topsheet 22 and the stool indicator 40 is larger than that of the topsheet 22. Therefore, when feces are excreted on the skin side of the top sheet 22, the water (feces juice) contained in the feces is drawn to the non-skin side by the second sheet 35 and the core wrap sheet 25, and the feces indicator 40 from the top sheet 22. It becomes easy to penetrate into. Since ordinary stool has a state in which particles and feces are mixed (emulsion state), it is difficult to pass through the nonwoven fabric such as the top sheet 22. However, as in the present embodiment, by increasing the Klemm's water absorption of the sheet member (25, 35) provided on the non-skin side of the top sheet 22, the water in the stool smoothly permeates the top sheet 22. become able to.

When the Klemm's water absorbency of the top sheet 22 is larger than the Klemm's water absorbency of the second sheet 35 and the core wrap sheet 25, the force of drawing feces (feces juice) to the non-skin side of the top sheet 22 is hard to act. Therefore, the stool (feces juice) does not penetrate the top sheet 22, and the top sheet 22 itself absorbs and diffuses the stool. Therefore, it becomes difficult for stool (stool juice) to reach the stool indicator 40, and the stool detection accuracy decreases.

Further, in the present embodiment, the Klemm's water absorption of the second sheet 35 is larger than that of the core wrap sheet 25. As described above, the second sheet 35 needs to exert a function of strongly drawing the water (feces juice) contained in the feces from the top sheet 22 to the non-skin side. Therefore, it is desirable that the second sheet 35 has the highest Klemm's water absorption. On the other hand, the core wrap sheet 25 need only draw the feces juice that has passed through the top sheet 22 and particles have been removed to the non-skin side, so it is not necessary to draw the feces juice as strongly as the second sheet 35, and the Klemm water absorption There is no need to increase it. On the contrary, when the Klemm's water absorption of the core wrap sheet 25 is excessively large, the feces juice drawn into the core wrap sheet 25 diffuses on the surface of the core wrap sheet, and it becomes difficult to reach the stool indicator 40. Therefore, in the present embodiment, the Klemm's water absorption of the core wrap sheet 25 is made smaller than that of the second sheet 35.

FIG. 4 is a table showing the results of verification experiments on the relationship between the Klemm's water absorbency of each sheet member and the reactivity of the stool indicator 40. In the experiment, first, the Klemm water absorption evaluation test was performed by a method according to JIS P 8141:2004, and the Klemm water absorption was measured for each 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 sampled from each sheet member 22, 35, 25, and placed at a position 10 mm from the short side of each test piece. A marking line is provided parallel to the short side, and a clip or a weight is attached to the area between the short side and the marking line. Then, attach the end opposite to the area where the clip is attached in the long side direction to the hanging tool, put the test piece up to the marked line in the dipping container filled with liquid, and the liquid rises after 1 minute. Measure the height. The liquid used for the measurement is artificial stool, and the Klemm water absorption (stool Klemm water absorption) for stool is measured by this. As an example, artificial stool contains ion-exchanged water: 73%, NaCl: 1%, glycerin: 13.9%, NaCMC: 2%, cellulose 10%, colored powder 0.1%, and the viscosity is 2000 mPa·S. The adjusted one was used. In the present experiment, when the diaper 1 was actually worn, the time taken for the liquid to rise was measured after 1 minute in consideration of the time required for the excreted feces (feces juice) to reach the feces indicator 40. There is. This is because if the time of 1 minute or more elapses, the stool becomes easy to dry, and thereafter the stool (feces juice) may not easily reach the stool indicator 40, and it may be difficult to detect defecation. However, the size of the test piece, the time for soaking the test piece, and the like may be changed in consideration of the usage status of the diaper 1.

The water absorption of fecal creme 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 water absorption of fecal creme was decreased in the order of the second sheet 35, the core wrap sheet 25, and the top sheet 22. Even when the test was performed using water (urine) as the liquid, the Klemm's 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 arranged on the most skin side in the thickness direction, and the stool indicator 40 is arranged on the most non-skin side in the thickness direction. To do. Then, after 5 minutes, 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 under the conditions 1 to 3 in which the order of stacking the sheet members 22, 25, and 35 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 interval between A and B in the photograph of FIG. 4) was the widest, and it became clear that stool could be easily detected. This is because, as described above, the stool is drawn from the top sheet 22 by the second sheet 35, and the stool indicator 40 is penetrated by the core wrap sheet 25 to the extent that the stool is not diffused.

Condition 2 is a case where the second sheet 35 and the core wrap sheet 25 are replaced with each other. That is, this is the case where the top sheet 22 having the smallest Klemm's water absorption is arranged on the most skin side, and the second sheet 35 having the largest Klemm's water absorption is arranged on the most non-skin side. In this case, the reaction range of the stool indicator 40 was narrower than that in Condition 1, and it was revealed that it was more difficult to detect stool than in Condition 1. This is because the Klemm's 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 faucet is not easily drawn from the top sheet 22 to the core wrap sheet 25, and a sufficient amount of the feces juice is drawn. This is because the stool juice did not penetrate to the stool indicator 40.

Condition 3 is a case in which the second sheet 35 having the highest Klemm's water absorption is arranged on the most skin side and the top sheet 22 having the smallest Klemm's water absorption is arranged on the most non-skin side. In this case, it was revealed that the reaction range of the stool indicator 40 was the narrowest and almost no stool could be detected. This is because the creme water absorption by the second sheet 35 was too large on the skin side and stool hardly penetrated to the non-skin side.

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

Moreover, as shown in FIG. 1, the second sheet 35 and the core wrap sheet 25 have a portion that overlaps with the stool indicator 40 in the longitudinal direction and the width direction of the diaper 1. In this case, the feces (feces 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 are directly transmitted to the non-skin side in the thickness direction. Then, it becomes easy to directly contact the stool indicator 40. This makes it easier for the stool indicator 40 to detect a stool.

Further, as shown in FIG. 1, the center of the second seat 35 is located on the rear side (back side) of the center of the diaper 1 (position BB in FIG. 1) in the longitudinal direction. That is, the second seat 35 is arranged closer to the rear side in the longitudinal direction. Therefore, when the diaper 1 is worn, the second seat 35 is easily arranged on the buttocks side (that is, near the anus) of the wearer, and the discharged feces can be quickly drawn to the non-skin side. This makes it easier for 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 (back side) with respect to the center of the diaper 1 (position BB in FIG. 1 ). The diaper 1 is folded in two in the longitudinal direction at the center position in the longitudinal direction (BB in FIG. 1) when worn. That is, the center position of the diaper 1 in the longitudinal direction is the bending position of the diaper 1. If the second sheet 35 overlaps with the center position of the diaper 1 in the longitudinal direction, when the diaper 1 is worn, the second sheet 35 is also folded in the longitudinal direction and peels off at the joint with the top sheet 22. There is. When the top sheet 22 and the second sheet 35 are peeled off, the pulling of the feces juice from the top sheet 22 to the second sheet 35 may be hindered at the portion where the peeling occurs, and the feces juice may not easily reach the feces 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 with each other, the second sheet 35 is unlikely to bend and peels off from the top sheet 22. Therefore, it is possible to reduce the difficulty of the stool juice reaching the stool indicator 40.

<About the structure of the 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 absorbent body 21 to detect stool. However, stool usually has high viscosity and low fluidity. It is difficult for the absorber 21 to penetrate in the thickness direction. Therefore, when the stool indicator 40 is provided on the non-skin side of the absorbent body 21, it may be difficult for stool to reach the stool indicator 40.

On the other hand, in the present embodiment, the absorber 21 has the low basis weight portion 21A in the center portion in the width direction (see FIG. 2). In the low grammage portion 21A, the grammage is lower than the grammage of the regions 21B and 21B adjacent to the low grammage portion 21A from the outer side in the width direction. Here, the basis weight is a 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 grammage of each of the adjacent regions 21B is preferably about 370 g/m ² . If the basic weight of the low basic weight portion 21A exceeds 200 g/m ² , the basic weight is too high, and it becomes difficult for feces to pass through the low basic 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 the low basis weight portion 21A in the longitudinal direction and the width direction. With such a configuration, the feces (feces juice) excreted in the diaper 1 permeate the low basis weight portion 21A of the absorbent body 21 and move from the skin side to the non-skin side to easily reach the feces indicator 40. .. Therefore, the stool detectability of the stool indicator 40 can be further enhanced.

The basic weight of the low basic 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 center portion in the width direction. By providing a region 21C (slit 21C) in which the basis weight is zero in the center portion in the width direction of the low basis weight portion 21A, the moisture of feces can be drawn into the lower layer in the thickness direction by passing through the region 21C. Becomes As a result of improving the pulling property 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 absorbent body 21 and the backsheet 23 in the thickness direction. Then, in the area corresponding to the low basis weight portion 21A in the width direction, the top sheet 22 and 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 a joining method, a method of applying 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, or a curtain spray method and fixing it, or an ultrasonic welding (sonic seal) method is used. Can be mentioned.

Further, as shown in FIG. 5, when the low basis weight portion 21A has the 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 that covers the skin side surface of the absorbent core 24 and the non-skin side portion 25b that covers the non-skin side surface are 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, in the region corresponding to the low basis weight portion 21A or the slit 21C and the width direction, by joining each of the sheets adjacent to each other in the thickness direction, there is no space in the thickness direction between the sheets, It is possible to improve the ability of faecal water to be drawn into the non-skin side in the thickness direction.

Further, regarding the bonding strength in the low grammage portion 21A between the respective 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. Usually, large particles and water are mixed in the stool, but the density of the adhesive such as hot-melt adhesive in the top sheet 22 in which the particles and water are mixed is the most impenetrable for stool penetration. By lowering, it is difficult to prevent stool from penetrating the top sheet 22. On the other hand, since the moisture of the feces filtered from the top sheet 22 has penetrated into the second sheet 35, the density of an adhesive such as a hot melt adhesive for joining the second sheet 35 and the core wrap sheet 25 is increased. However, it does not hinder the penetration.

=== Other Embodiments ===
Although the embodiments of the present invention have been described above, the above embodiments are for the purpose of facilitating the understanding of the present invention and are not for limiting and interpreting the present invention. Further, it is needless to say that the present invention can be modified or improved without departing from the spirit of the present invention and that the present invention includes equivalents thereof.

In the above-described embodiment, the second sheet 35 is arranged between the top sheet 22 and the core wrap sheet 25 in the thickness direction, but the diffusion sheet that diffuses the liquid between the absorbent body 21 and the stool indicator 40. You may arrange as. By doing so, the moisture 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 ground contact area between the second seat 35 and the feces can be increased, and the permeability of the feces to the second seat 35 can be improved.

Further, in the above-described embodiment, the low basis weight portion 21A has 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 square shape, a rectangular shape elongated in the width direction, a heart-shaped pattern shape, or the like may be used.

Moreover, in the above-described embodiment, the number of the low basis weight portions 21A is one at the center portion in the width direction of the diaper 1, but a plurality of the low basis weight portions 21A may be provided. In this case, it is possible to further improve the detection of defecation by arranging a plurality of stool indicators 40 so as to have an overlapping portion in each of the low basis weight portions 21A in the longitudinal direction and the width direction.

Further, in the above-described embodiment, it has been described that the stool (feces juice) is easily drawn into the stool indicator 40 by adjusting the Klemm water absorption of the top sheet 22, the second sheet 35, and the core wrap sheet 25. Such a configuration is also effective for an absorbent article that does not have the stool indicator 40. For example, as in the above-described embodiment, the creme water absorption of the top sheet 22 is made small and the creme water absorption of the second sheet 35 is made large, so that 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 drawn into the non-skin side without being diffused and easily absorbed by the absorber 21. As a result, moisture such as urine is absorbed by the absorber 21 while suppressing rewetting of the top sheet 22, 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 part 5 Crotch part 7 Rear part 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 portion 21B Region (non-low basis weight portion)
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 Elastic Member 29 Target Tape 30 Fastening Tape 35 Second Sheet 40 Stool Indicator 50 Urine Indicator

Claims (16)

Has a longitudinal direction, a width direction, and a thickness direction in a deployed state,
An absorber,
A top sheet provided on the skin side in the thickness direction of the absorber,
A stool indicator provided on the non-skin side in the thickness direction with respect to the absorber, and exhibiting a predetermined reaction by contact with stool,
An absorbent article having:
In the thickness direction, one or more sheet members are arranged between the top sheet and the stool indicator,
The Klemm's water absorption of the sheet member is larger than the Klemm's water absorption of the top sheet. The absorbent article according to claim 1, wherein
An absorbent article, wherein the sheet member is a second sheet provided between the top sheet and the absorber in the thickness direction. The absorbent article according to claim 2, wherein
The absorbent body has a liquid-absorbent absorbent core,
The absorbent article, wherein the sheet member is at least one of a core wrap sheet that covers the absorbent core from the skin side and the non-skin side in the thickness direction, and the second sheet. The absorbent article according to claim 3, wherein
The creme water absorption of the second sheet is larger than the creme water absorption of the core wrap sheet. The absorbent article according to any one of claims 2 to 4,
The absorbent article is characterized in that the center of the second sheet is located rearward of the center of the absorbent article in the longitudinal direction. The absorbent article according to claim 5, wherein
The absorbent article is characterized in that, in the longitudinal direction, a front side end of the second sheet is located rearward of a center of the absorbent article. The absorbent article according to any one of claims 1 to 6, wherein:
An absorbent article, wherein the sheet member and the stool indicator have a portion overlapping with each other in the longitudinal direction and the width direction. The absorbent article according to any one of claims 1 to 7, wherein
The absorber has a low basis weight portion in the center portion in the width direction,
The basis weight of the low basis weight portion is lower than the basis weight of a region adjacent to the low basis weight portion from the outside in the width direction,
An absorbent article having a portion where the low basis weight portion and the stool indicator overlap in the longitudinal direction and the width direction. The absorbent article according to claim 8, wherein
A second sheet provided on the non-skin side in the thickness direction with respect to the top sheet, and a back sheet provided on the non-skin side in the thickness direction with respect to the absorber,
Equipped with
The stool indicator is arranged between the low basis weight portion of the absorber and the back sheet in the thickness direction,
An absorbent article in which the top sheet and the second sheet are joined in the thickness direction in a region corresponding to the low basis weight portion in the width direction. The absorbent article according to claim 9, wherein
The absorbent body has an absorbent core and a core wrap sheet that covers the skin side surface and the non-skin side surface of the absorbent core,
The absorbent article, wherein the second sheet and the core wrap sheet are joined in the thickness direction in a region corresponding to the low basis weight portion in the width direction. The absorbent article according to claim 10, wherein:
An absorbent article, wherein the core wrap sheet and the back sheet are joined in the thickness direction in a region corresponding to the low basis weight portion in the width direction. The absorbent article according to any one of claims 8 to 11,
The absorbent article, wherein the low basis weight portion has a region where the basis weight is zero at least in the center portion in the width direction. The absorbent article according to claim 12,
A second sheet provided on the non-skin side in the thickness direction with respect to the top sheet, and a back sheet provided on the non-skin side in the thickness direction with respect to the absorber,
Equipped with
The absorbent body has an absorbent core and a core wrap sheet that covers the skin side surface and the non-skin side surface of the absorbent core,
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 a region where the basis weight is zero. An absorbent article characterized by the above. The absorbent article according to claim 13,
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 a region where the basis weight is zero. And absorbent articles. The absorbent article according to any one of claims 1 to 14, wherein:
The absorbent article is characterized in that the center of the stool indicator is located rearward of the center of the absorbent article in the longitudinal direction. The absorbent article according to any one of claims 1 to 15,
The stool indicator has an area arranged rearward of the center of the absorbent article in the longitudinal direction, and is larger than an area arranged frontward of the center of the absorbent article in the longitudinal direction, An absorbent article characterized by the above.