JP7209421B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles.

One example of an absorbent article is a disposable diaper. In Patent Document 1, a pocket consisting of at least one of a low basis weight portion having a lower basis weight of absorbent material than the surroundings and a non-weight basis portion having no absorbent material is provided in the width direction central portion of the absorbent body, and the absorbent body and the liquid impermeable pocket are provided. A disposable diaper is disclosed in which a non-pocket portion and a non-pocket portion are provided with an excretion indicating portion that changes color upon contact with excreted fluid between the permeable sheet. Further, in Patent Document 2, a hydrophilic composition that changes visually when it comes into contact with water is placed in a predetermined portion between the absorbent core and the backsheet, and the composition corresponds to the portion where the composition is placed. Thus, an absorbent article is disclosed in which an absorbent core is provided with a portion having a smaller absorption capacity than other portions.

JP 2010-75464 A Japanese Unexamined Patent Application Publication No. 2005-21390

However, in the disposable diaper of Patent Literature 1, the excretion display portion is arranged in the non-pocket portion located on the side of the pocket portion composed of the low basis weight portion or the non-weight basis portion of the absorbent, so that urine passes through the absorbent during urination. Although it is possible to reach the excretion display area by permeation, it is difficult to pass through the high basis weight area of the absorbent body during defecation due to the high viscosity of feces, and there is a possibility that the excretion display area may not be reached.

In addition, in the absorbent article of Patent Document 2, since the composition arranged corresponding to the low-absorbent portion having a smaller absorption capacity than the other portions is a hydrophilic composition, even water in the urine It also reacts with water in feces, and it is impossible to distinguish whether urine or feces is excreted from the outer surface of the absorbent article. In addition, when urination is performed first and the composition reacts, it becomes difficult to react to subsequent defecation, and there is a possibility that defecation cannot be detected.

The present invention has been made in view of the conventional problems as described above, and its object is to allow the moisture of the stool to smoothly permeate the absorbent body and reach the stool indicator. An object of the present invention is to provide an absorbent article.

The main invention for achieving the above object is
It has a longitudinal direction, a width direction, and a thickness direction in a plan view in an unfolded state,
a liquid absorbent absorbent;
An absorbent article having a stool indicator that exhibits a predetermined reaction upon contact with stool,
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,
The fecal indicator is provided on the non-skin side in the thickness direction of the absorbent body,
The feces indicator and the low basis weight portion have overlapping portions in the longitudinal direction and the width direction,
The low basis weight portion includes a slit having a basis weight of zero provided in the central portion in the width direction, and a pair of high density regions provided along the longitudinal direction on both outer sides of the slit in the width direction. has
The density of the high density region is higher than the density of the region adjacent to the low basis weight portion from the outside in the width direction.
An absorbent article characterized by:
Other features of the present invention will become apparent from the description of the specification and accompanying drawings.

ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which can permeate|transmit the water|moisture content of feces smoothly through an absorber, and can reach|attain the water|moisture content of feces to a feces indicator can be provided.

Fig. 2 is a plan view of the diaper 1 in an unfolded and stretched state; 2 is a cross-sectional view taken along line AA shown in FIG. 1; FIG. It is a partially enlarged cross-sectional view showing another configuration of the low basis weight portion 21A. FIG. 4 is a diagram showing an example of a pattern of a urine indicator 40 and a feces indicator 50; It is a figure which shows the modification of the diaper 1. FIG.

At least the following matters will become apparent from the descriptions of this specification and the accompanying drawings.
An absorbent article having a longitudinal direction, a width direction, and a thickness direction in a plan view in an unfolded state, and having a liquid-absorbent absorbent body and a feces indicator that exhibits a predetermined reaction upon contact with feces. The absorbent body 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 basis weight of a region adjacent to the low basis weight portion from the outside in the width direction. and the feces indicator is provided on the non-skin side of the absorbent body in the thickness direction, and the feces indicator and the low basis weight portion overlap in the longitudinal direction and the width direction. An absorbent article characterized by having a portion.

According to such an absorbent article, the absorber is provided with a low basis weight portion having a low basis weight, and the stool indicator is arranged on the non-skin side of the low basis weight portion in the thickness direction, thereby reducing the water content of feces. It becomes possible to smoothly permeate the absorber through the basis weight portion. As a result, it is possible to improve the reach of stool water to the stool indicator, and to effectively react the stool indicator.

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

According to such an absorbent article, by providing a region having a zero basis weight in the low basis weight portion, the water content of feces permeates through the region having a zero basis weight and is more easily drawn into the lower layer. The improved drawability to the lower layer can enhance the responsiveness of the fecal indicator.

In this absorbent article, at least a part of the low basis weight portion has a high density region having a density higher than that of a region adjacent to the low basis weight portion from the outside in the width direction. is desirable.

According to such an absorbent article, by providing the high-density region in the low basis weight portion, a coarse and dense structure is formed by the other absorbent portion and the low basis weight portion, which is convenient for the high-density low basis weight portion. becomes easy to draw in moisture. Therefore, even a small amount of stool can effectively cause the stool indicator to react.

In this absorbent article, the feces indicator is provided on the non-skin side of the high density region in the thickness direction, and the feces indicator and the high density region are arranged in the longitudinal direction and the width direction. It is desirable to have portions that overlap in direction.

According to such an absorbent article, stool is likely to be drawn into the high-density region due to the sparse and dense structure of the high-density region of the low basis weight portion, and the stool indicator is arranged so as to correspond to the high-density region in the thickness direction. By doing so, it is possible to improve the ability to draw in stool, and to allow the stool indicator to react more effectively.

In such an absorbent article, it is desirable that the center of the low basis weight portion is located on the rear side of the center of the absorbent article in the longitudinal direction.

According to such an absorbent article, by providing the low basis weight portion behind the longitudinal center of the absorbent article, which is the region facing the anus of the wearer, feces can be efficiently drawn in. can be done.

In such an absorbent article, it is desirable that the front end of the low basis weight portion is located on the rear side of the center of the absorbent article in the longitudinal direction.

According to such an absorbent article, by disposing the low basis weight portion only in the rear region of the absorbent article, it is possible to maintain high absorbency in the central portion in the longitudinal direction where both feces and urine tend to flow. .

In this absorbent article, the area of the low basis weight portion arranged on the rear side of the center of the absorbent article in the longitudinal direction is the front side of the center of the absorbent article in the longitudinal direction. and the area of the faeces indicator disposed rearward of the center of the absorbent article in the longitudinal direction is an area forward of the center of the absorbent article in the longitudinal direction. is preferably larger than the area located in the

According to such an absorbent article, since the area of the low basis weight portion is large on the rear side of the center in the longitudinal direction of the absorbent article, which faces the wearer's anus, feces can be drawn in more reliably. can be done. Similarly, more of the fecal indicators are located in the longitudinally rear region of the absorbent article near the defecation position, so that the fecal indicators can effectively respond over a wide range.

In such an absorbent article, it is desirable that the response of the fecal indicator to urine is different than the response of the fecal indicator to feces.

According to such an absorbent article, feces excreted in the absorbent article can be detected with high accuracy.

This absorbent article has a back sheet provided on the non-skin side in the thickness direction relative to the absorbent body, and the fecal indicator is located between the low basis weight portion and the back in the thickness direction. It should be positioned between the sheets and visually change upon contact with feces.

According to such an absorbent article, the presence or absence of defecation can be quickly and easily recognized from the outer surface of the absorbent article by visually changing the feces indicator in response to the wearer's feces.

The absorbent article further comprises a second sheet disposed so as to be in contact with the absorbent body in the thickness direction, wherein the second sheet and the low basis weight portion are arranged in the longitudinal direction and the width direction It is desirable to have overlapping portions.

According to such an absorbent article, by providing the second sheet that improves the ability to draw in water from feces so as to overlap the low basis weight portion, it becomes easier for feces to permeate and permeate the lower layer side in the thickness direction. , to improve the reach of flights to flight indicators.

In such an absorbent article, it is desirable that the longitudinal length of the fecal indicator is longer than the longitudinal length of the low basis weight portion.

According to such an absorbent article, since the length of the stool indicator is longer in the longitudinal direction, it becomes easier to check the stool indicator visually changed after defecation from various angles, and it is possible to notice the defecation early. .

In such an absorbent article, it is desirable that the faeces indicator is located inside both ends of the low basis weight portion in the longitudinal direction and the width direction.

According to such an absorbent article, by arranging the stool indicator so as to be included in the low basis weight portion in both the longitudinal direction and the width direction, moisture from stool can easily reach any part of the stool indicator. Become.

The absorbent article further comprises a top sheet provided closer to the skin in the thickness direction than the absorbent body, and a second sheet provided closer to the non-skin side in the thickness direction than the top sheet. wherein the feces indicator is arranged between the low basis weight portion of the absorbent body and the backsheet in the thickness direction, and in a region corresponding to the low basis weight portion in the width direction, It is desirable that the top sheet and the second sheet are joined together 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, there is no space between the top sheet and the second sheet in the thickness direction, and the thickness is reduced. It is possible to improve the ability to attract water from feces to the non-skin side.

In this 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 in the width direction, the low basis weight portion and the 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, by joining the second sheet and the core wrap sheet in the region corresponding to the low basis weight portion, a space is generated in the thickness direction between the second sheet and the core wrap sheet. Therefore, it is possible to improve the ability to attract water from feces to the non-skin side in the thickness direction.

This absorbent article has a back sheet provided on the non-skin side in the thickness direction relative to the absorbent body, and in the width direction, in the region corresponding to the low basis weight portion, the core The wrap sheet and the back sheet are joined together in the thickness 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 generated in the thickness direction between the core wrap sheet and the back sheet. Instead, it becomes easier for water in stool that has permeated the absorbent to reach the stool indicator.

In this absorbent article, the low basis weight portion of the absorbent body has a region where the basis weight is zero at least in the central portion in the width direction, and the basis weight is zero in the width direction. It is desirable that the top sheet, the second sheet, the core wrap sheet, and the back sheet are joined together in the thickness direction in areas corresponding to the areas.

According to such an absorbent article, there is no space between the sheets in the thickness direction, and the ability to draw water from feces to the non-skin side in the thickness direction can be improved.

In this 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 in the width direction 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 the zero region.

According to such an absorbent article, there is no space in the thickness direction between the skin side portion and the non-skin side portion of the core wrap sheet, and the ability to attract water from feces to the non-skin side in the thickness direction is reduced. can be improved.

In this absorbent article, the low basis weight portion of the absorbent body has a region with a basis weight of zero at least in the central portion in the width direction, and the feces indicator and the region with a basis weight of zero. A pair of having overlapping portions in the longitudinal direction and the width direction and exhibiting a reaction different from the predetermined reaction by contacting urine on the non-skin side in the thickness direction of the absorbent body A urine indicator is provided, and a non-low basis weight portion, which is a portion other than the low basis weight portion in the absorber, and the pair of urine indicators desirably have overlapping portions in the longitudinal direction and the width direction. .

According to such an absorbent article, by providing the feces indicator in the region where the basis weight of the low basis weight portion is zero, the moisture of the feces easily permeates the absorbent body, and the urine indicator is positioned between the low basis weight portion and the low basis weight portion. are placed in correspondence with different non-low basis weight portions to prevent faecal contamination of the urine indicator. In addition, it is possible to prevent the response of the urine indicator from being lowered by the oil film of the stool, and the response of the urine indicator to urine is not inhibited.

===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 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 a "diaper") in an unfolded and stretched state. FIG. 2 is a cross-sectional view taken along line AA shown in FIG. The state in which the diaper 1 is stretched refers to a state in which the diaper 1 is stretched to such an extent that the wrinkles generated in the diaper 1 are substantially invisible when the diaper 1 is unfolded. The diaper 1 is in a stretched state until the dimensions of the top sheet 22, etc.) match or are close to the dimensions of the individual members.

The diaper 1 of this embodiment is a so-called open-type disposable diaper, and has a front portion 3, a crotch portion 5, and a rear portion 7, as shown in FIG. The front part 3 is a part to be positioned in the front part (abdominal side, front waistline) of the wearer. Moreover, the rear part 7 is a part which will be located in a wearer's rear part (dorsal side, back waist circumference). The crotch portion 5 is a portion that will be positioned 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 a plan view of the unfolded state, 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 the 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 strip region 12 , side flaps 14 , leg gathers 16 and leg side gathers 17 . Fastening tapes 30 are attached to the pair of side flaps 14 at the rear portion 7, respectively.

The central band-shaped region 12 is a band-shaped region located at the center in the width direction and 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 portion that absorbs and retains liquid such as urine excreted by the wearer. The central belt-like region 12 has a vertically long shape (shape along the longitudinal direction) including the liquid-retaining absorbent body 21 . The central strip region 12 mainly includes an absorbent body 21, a liquid-permeable top sheet 22 covering the absorbent body 21 from the skin side, and a liquid-impermeable back sheet 23 covering the absorbent body 21 from the non-skin side. , and an exterior sheet 27 (for example, nonwoven fabric) forming the exterior of the diaper 1 (see FIG. 2). A liquid-permeable second sheet 35 is further provided in the central belt-like region 12, but the second sheet 35 may not necessarily be provided.

As shown in FIG. 2, the absorbent body 21 of the present embodiment covers an absorbent core 24 that absorbs excrement such as urine, and covers the absorbent core 24 from both the skin side and the non-skin side in the thickness direction. and a liquid-permeable core wrap sheet 25 . Examples of materials suitable for the core wrap sheet 25 include tissue paper and non-woven fabric.
The absorbent body 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 a predetermined shape. Moreover, the absorbent core 24 should just be provided in the crotch part 5 at least. As the liquid absorbent material constituting the absorbent core 24, for example, liquid absorbent fibers such as pulp fibers and liquid absorbent granules such as super absorbent polymer (so-called SAP) can be used. Moreover, liquid absorbent materials other than liquid absorbent fibers and liquid absorbent granules may be included.

A pair of leg-surrounding elastic members 28 (for example, rubber threads) that are stretchable 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 belt-like region 12 . The leg-surrounding elastic member 28 is a member that imparts stretchability to the central belt-like region 12 of the crotch portion 5 . In this embodiment, the leg elastic members 28 are attached while being stretched in the longitudinal direction. As a result, the leg elastic member 28 develops contractile force along the longitudinal direction with respect to the crotch portion 5 of the central belt-like region 12 .

The side flaps 14 are portions located on both sides of the central belt-like 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) in the width direction of the side flaps 14 in the crotch portion 5 is narrower than the length (width) in the width direction of the side flaps 14 in the front portion 3 and the rear portion 7 . The side flaps 14 are 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 crotch portion 5, and the rear portion 7, and is made of, for example, nonwoven fabric. The skin-side sheet 26 is also a member that constitutes the leg side gathers 17 (three-dimensional gathers). configure.

A pair of side flaps 14 are provided with leg gather elastic members 15 that extend 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 openings when the diaper 1 is worn. That is, the leg gather elastic member 15 is a leg circumference elastic member that fits the leg-turned portion of the diaper 1 to the wearer's leg. Further, the leg gathers 16 are configured by the leg gathers elastic member 15 imparting elasticity to the skin-side sheet 26 of the crotch portion 5 and the back sheet 23 .
The leg side gathers 17 are three-dimensional gathers for preventing liquid leakage from the gap of the leg turning. A pair of leg side gathers 17 are formed along the longitudinal direction over the front portion 3, crotch portion 5 and 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 belt-like 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 joints 26A between the central band-shaped region 12 and the side flaps 14 . When the diaper 1 is worn, the stretchability 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 with the joint portion 26A as a base point, thereby preventing excrement from lying on the side of the wearer's skin. Control leakage.

The fastening tapes 30 are arranged on both sides in the width direction of the side flaps 14 in the rear portion 7 of the diaper 1 (see FIG. 1). By engaging each fastening tape 30 with a target tape 29 (FIG. 1), which will be described later, openings around the waist and legs of the diaper 1 are formed, and the position of the diaper 1 with respect to the wearer's body (trunk). 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 part 3 . The target tape 29 is a member that can be engaged with the fastening tape 30, and is made of nonwoven fabric, for example. 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 area may be formed directly on the outermost non-woven fabric forming the back sheet 23. FIG. By engaging the fastening tape 30 with the target tape 29, the diaper 1 is put on.

The diaper 1 of the present embodiment has a feces indicator 40 in the widthwise central portion of the diaper 1, and further has a pair of urine indicators 50 spaced apart from the feces indicator 40 to the outside in the width direction. (see Figure 1). The feces indicator 40 and the urine indicator 50 are arranged on the non-skin side of the absorbent body 21 in the thickness direction. The urine indicator 50 is configured as an indicator containing a pH indicator that is used in conventional general diapers. For example, the urine indicator 50 detects urine excretion by exhibiting a predetermined reaction (for example, a color reaction) upon contact with urine using the pH of urine as a reaction factor (urine indicator reaction factor). . Details of the flight indicator 40 will be described later.

<Principle of Flight Indicator 40>
The stool indicator 40 is a stool indicator for an absorbent article such as the diaper 1, and exhibits a predetermined reaction (for example, color reaction) upon contact with a predetermined reaction factor (stool indicator reaction factor) contained in stool. It detects that the stool has been discharged. In this embodiment, the stool indicator 40 contains a chemical component that detects biosubstances in stool, and the response of this chemical component to stool differs from that to urine, so that only stool excretion 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, proteins have a structure in which amino acids are polymerized, and have acidic and basic functional groups at both ends and side chains of the main chain of the protein. A pH indicator can be discolored (protein error method). In this embodiment, the pH indicator responds to stool by detecting undigested protein derived from food in stool, protein secreted from intestinal bacteria, and the like. Specific examples of pH indicators that can be used include tetraphenol blue, bromophenol blue, bromocresol green, thymolphthalein, and the like. Furthermore, it is desirable that the pH indicator be safe to the skin and have excellent storability against moisture and sunlight.

In addition, it is desirable that the chemical component contained in the stool indicator 40 responds to stool and not to urine so as not to erroneously detect whether the excrement is stool or urine. . Therefore, the fecal indicator 40 in the present embodiment exhibits a reaction such as a color reaction in response to a fecal indicator reaction factor (protein or the like) having a predetermined concentration or higher. making it difficult to react.

In general, the urine of a healthy person does not contain protein, and the protein in the urine of an unhealthy person is less than 10,000 mg/L. Therefore, in the present embodiment, the fecal indicator 50 preferably responds to proteins of 150 mg/L or more, and more preferably responds to proteins of 5,000 mg/L or more by the protein error method using a pH indicator. More preferably, it responds to 10,000 mg/L or more of protein. For example, under the condition that bromophenol blue is used as the chemical component, when the fecal indicator 50 responds to 150 mg/L or more of protein, the applied amount of the pH indicator per 1 cm2 of the fecal indicator 50 can be 16.3 μg. Preferably, when the fecal indicator 50 responds to 5,000 mg/L or more of protein, the applied amount of the pH indicator per cm2 of the fecal indicator 50 is preferably 0.5 μg, and the fecal indicator 50 is 10,000 mg/cm2. When responding to L or more protein, the applied amount of pH indicator per cm ² of fecal 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 feces indicator 40 for the wearer of the absorbent article is enhanced.

In this embodiment, by adjusting the application amount of the pH indicator in this way, the range in which the feces indicator 40 can react to urine is relatively small compared to the range in which it can react to feces. 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 it difficult for the stool indicator 40 to react to urine.

Moreover, the stool indicator 40 is not limited to the above-described protein as a reaction factor. For example, it may react with substances derived from stool, such as intestinal bacteria contained in stool, ionic strength of stool that correlates with the specific gravity of stool, and bilirubin, a bile pigment. These components are generally not contained in urine, or the amounts and specific gravities contained in urine are very small compared to stool. Therefore, similarly to the case of using protein as a reaction factor, the stool indicator 40 is less likely to react to urine and more likely to react to stool. Therefore, feces excreted in the diaper 1 can be detected with high accuracy.

<Specific Configuration of Flight Indicator 40>
The feces indicator 40 is formed by applying an adhesive (eg, hot-melt adhesive HMA) containing the chemical component (eg, pH indicator) as described above to the skin side of the back sheet 23 of the diaper 1 . In this embodiment, as shown in FIG. 1, a coater is used to apply a hot-melt adhesive to a band-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. A stool indicator 40 is formed by coating (HMA). According to such coater coating, it is possible to form the stool indicator 40 with a uniform film thickness and little unevenness, and it is possible to improve the detection accuracy of stool. Moreover, the manufacturing cost can be suppressed. Note that the urine indicator 50 can also be formed in the same manner.

The faecal indicator 40 may also be formed by mixing the chemical component with an ink and printing and coating the backsheet 23 or core wrap sheet 12 . Further, the faeces indicator 40 is formed by joining and fixing a filter paper or non-woven fabric impregnated with a chemical component to the back sheet 23 or the core wrap sheet 12 with a hot melt adhesive (HMA) or ultrasonic welding. Also good.

<Regarding the low basis weight portion 21A>
As described above, in this embodiment, the stool indicator 40 is arranged on the non-skin side of the absorbent body 21 to detect stool. It is difficult to penetrate the body in the thickness direction. Therefore, when the feces indicator 40 is provided on the non-skin side of the absorbent body 21 , there is a possibility that feces may be difficult to reach the feces indicator 40 .

On the other hand, in the present embodiment, the absorbent body 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, 21B adjacent to the low basis weight portion 21A from the outside in the width direction. Here, the basis weight is mass per unit area. The basis weight of the low basis weight portion 21A of the present embodiment is preferably about 0 to 200 g/m ² , more preferably about 100 g/m ² . The basis weight of each adjacent region 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 feces to pass through the low basis weight portion 21A.

Here, the feces indicator 40 described above is provided on the non-skin side in the thickness direction of the absorbent body 21, as shown in FIG. Further, as shown in FIG. 1, the fecal indicator 40 and the low basis weight portion 21A have overlapping portions in the longitudinal direction and the width direction. By arranging the stool indicator 40 on the non-skin side of the low basis weight portion 21A in the thickness direction as in the present embodiment (see FIG. 2), the water content of the stool passes through the low basis weight portion 21A and reaches the absorber 21. can pass through smoothly. As a result, it is possible to improve the reach of stool water to the stool indicator 40 and to effectively react the stool indicator 40 .

In addition, at least a part of the low basis weight portion 21A has a high density region 21A' having a higher density than the regions 21B adjacent to the low basis weight portion 21A from the outside in the width direction. Preferred (see Figure 3). The method of measuring the density is to calculate the total basis weight (g/m ² ) of the pulp fibers and SAP contained in the absorber 21 and measure the thickness (mm) of the absorber 21 at that portion. Then, the density is calculated from the numerical values of the basis weight and the thickness. The density of the low basis weight portion 21A' of this embodiment is preferably 200 to 900 kg/m ³ , more preferably about 333 kg/m ³ . The density of the regions 21B, 21B is preferably about 185 kg/m ³ . By providing the high-density region 21A' in the low basis weight portion 21A, the other portions of the absorbent body 21 (regions 21B, 21B) and the low basis weight portion 21A form a coarse and dense structure, and the low basis weight portion 21A has a high density. It becomes easy to draw the moisture of the stool into the 21A side. Therefore, even a small amount of stool can effectively cause the stool indicator 40 to react.

Further, the fecal indicator 40 is arranged so as to have a portion on the non-skin side of the high density region 21A' in the thickness direction and overlap the high density region 21A' in the longitudinal direction and the width direction. ing. As described above, feces are likely to be drawn into the high-density region 21A' due to the sparse and dense structure of the high-density region 21A' and the regions 21B, 21B of the low basis weight portion 21A. By arranging them so as to correspond to the density region 21A', the ability to attract stool to the stool indicator 40 is improved, and the stool indicator 40 can respond more effectively.

Next, a case where the low basis weight portion 21A has a portion with zero basis weight will be described. FIG. 3 is a partially enlarged sectional view showing another configuration of the low basis weight portion 21A (absorbent core 24). As shown in FIG. 3 , the low basis weight portion 21A may have a region 21C (hereinafter also referred to as “slit 21C”) having a basis weight of zero at least in the central portion in the width direction. In this case, a pair of high-density regions 21A' are provided in the low basis weight portion 21A outside the slits 21C in the width direction and along the longitudinal direction. By providing the high-density region 21A' in the low basis weight portion 21A, not only is the sparse-dense structure formed, but also, as shown in FIG. Since it has a steeper gradient, it is easier to draw in water from feces toward the central portion in the width direction. Furthermore, by providing a region 21C (slit 21C) having a basis weight of zero in the center of the width direction of the low basis weight portion 21A, the moisture of feces is drawn into the lower layer in the thickness direction by passing through the region 21C. will be The improved drawability to the lower layer results in improved responsiveness of the fecal indicator 40 . Although the high-density area 21A' in FIG. 3 has a gradient such that the basis weight decreases toward the center in the width direction, it is not limited to this. Each high-density region 21A′ may have a predetermined uniform basis weight, or may partially have a basis weight lower than the basis weight of the regions 21B, 21B adjacent from the outside in the width direction. Amounts may vary.

In addition, in the present embodiment, the slit 21C and the fecal indicator 40 have overlapping portions in the longitudinal direction and the width direction. As a result, water in feces can pass through a region (slit 21C) having a zero basis weight in the low basis weight portion 21A, and smoothly passes through the absorber 21. As shown in FIG. Further, as shown in FIG. 3, a pair of urine indicators 50 are provided on the non-skin side in the thickness direction of the absorbent body 21 (absorbent core 24), spaced outward in the width direction from the feces indicator 40. ing. A non-low basis weight portion (21B), which is a portion other than the low basis weight portion 21A in the absorbent body 21, and the pair of urine indicators 50 have overlapping portions in the longitudinal direction and the width direction. By arranging each urine indicator 50 corresponding to a non-low basis weight portion different from the low basis weight portion 21A, each urine indicator 50 can be prevented from being contaminated with feces. In addition, it is possible to suppress the deterioration of the response of the urine indicator 50 due to the oil film of the stool, so that the response of the urine indicator 50 to urine is not hindered.

In addition, in the present embodiment, the center of the low basis weight portion 21A in the longitudinal direction is located on the rear side of the line BB in FIG. 1 indicating the longitudinal center of the diaper 1. preferably. The rear region in the longitudinal direction of the diaper 1 is a region facing the wearer's anus, and by providing the low basis weight portion 21A in this region, it is possible to efficiently draw feces.

Further, the front end in the longitudinal direction of the low basis weight portion 21A may be positioned on the rear side of the longitudinal center of the diaper 1 (line BB in FIG. 1). As a result, the low basis weight portion 21A is arranged only on the rear side in the longitudinal direction of the diaper 1, and maintains high absorbency at the center in the longitudinal direction where both feces and urine tend to flow during defecation and urination. be able to.

Furthermore, in the longitudinal direction, the area of the low basis weight portion 21A that is arranged on the rear side of the line BB in FIG. 1, which is the center of the diaper 1, is arranged on the front side of the line BB. It is preferably larger than the area. That is, in the longitudinal direction of the diaper 1, it is preferable that more low basis weight portions 21A are present on the rear side. As a result, in the rear region of the diaper 1 corresponding to the position of the wearer's anus, more stool and moisture in the stool can permeate the low basis weight portion 21A, thereby improving fecal retraction.

Similarly, the area of the fecal indicator 40 in the longitudinal direction is located behind the line BB in FIG. 1, which is the center of the diaper 1. is preferably greater than By arranging more fecal indicators 40 in the rear region of the diaper 1 near the defecation position, the fecal indicators 40 can effectively respond over a wide range.

<About the second seat 35>
In this embodiment, the second sheet 35 is arranged on the non-skin side of the top sheet 22 in the thickness direction and in contact with the core wrap sheet 25 of the absorbent body 21 (see FIG. 2). Further, the second sheet 35 and the low basis weight portion 21A have overlapping portions in the longitudinal direction and the width direction (see FIG. 1). An example of the second sheet 35 is a mixed cotton fiber sheet of rayon and pulp. The basis weight (g/m2) of the sheet is preferably about 35 g/m2, and has a three-layer structure in which the first layer is 100% rayon, the second layer is 100% pulp fiber, and the third layer is 100% rayon. there is The second sheet 35 is preferably made of a hydrophilic material. Due to the effect of the hydrophilic material, the second sheet 35 has a high affinity for the water in feces, making it easier to absorb feces. In the second sheet 35 of the present embodiment, by arranging the pulp fibers between the rayon instead of the rayon alone, the pulp fibers fill the gaps between the rayon fibers and connect the fibers, thereby increasing the density. It makes it easier to draw moisture inside.

In this way, since the second sheet 35 has a high ability to draw up water from the stool, only the water in the stool on the top sheet 22 in which particles and water are mixed is permeated from the top sheet 22 to the second sheet 35. be able to. Since feces that have permeated the second sheet 35 have a large amount of moisture due to the removal of particles, the sparse and dense structure of the high-density region 21A' of the low basis weight portion 21A allows feces to flow from the second sheet 35 to the high density low basis weight portion 21A. Easy to permeate and permeate. As a result, the arrival of flights to the flight indicator 40 is improved.

<Examples of stool indicator 40 and urine indicator 50>
The stool indicator 40 and the urine indicator 50 of the present embodiment may be formed of different pattern patterns instead of the belt-like pattern shown in FIG. FIG. 4 is a diagram showing an example of patterns of the urine indicator 40 and the feces indicator 50. As shown in FIG. The feces indicator 40 is located between the low basis weight portion 21A and the back sheet 23 provided on the non-skin side in the thickness direction of the absorbent body 21 in the thickness direction (see FIG. 2). Visually changes upon contact. For example, the stool indicator 40 and the urine indicator 50 may be configured with patterns as shown in FIG. In FIG. 4 , the face mark is the urine indicator 50 and the star mark is the feces indicator 40 . Each stool indicator 40 and urine indicator 50 has the same or different predetermined color, and is configured to exhibit a different color from the initial predetermined color after urination or defecation. By visually changing the feces indicator 40 and the urine indicator 50 in response to the feces of the wearer, the presence or absence of defecation and urination can be quickly and easily recognized from the outer surface of the diaper 1, and feces or urine leakage. can be reduced. As for feces, it is possible to suppress skin troubles caused by feces adhering to the skin for a long time. Furthermore, since defecation or urination can be distinguished from the outer surface of the diaper, it is possible for the person who changes the diaper to prepare for the change during defecation before performing the work.

Moreover, as shown in FIG. 1, the longitudinal length of the fecal indicator 40 is preferably longer than the longitudinal length of the low basis weight portion 21A. By increasing the length of the feces indicator 40, it becomes easier to confirm visually changed feces indicator from various angles after defecation, and defecation can be noticed early.

However, the length of the feces indicator 40 in the longitudinal direction does not necessarily need to be set longer than the length of the low basis weight portion 21A in the longitudinal direction. A stool indicator 40 may be provided to be located on the inside. By arranging the feces indicator 40 so as to be included in the low basis weight portion 21A in both the longitudinal direction and the width direction, it becomes easier for the moisture of the feces to reach any part of the feces indicator.

In this 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. In the region 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. It is

Further, as shown in FIG. 3, when the low basis weight portion 21A has a slit 21C at least in the center 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 of the absorbent core 24 correspond to the slit 21C in the width direction. Bonding in the thickness direction is preferred.

The joining method of each sheet is 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, or an ultrasonic welding (sonic seal). law, etc.

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

Moreover, it is preferable that the bonding strength between the second sheet 35 and the core wrap sheet 25 be higher than the bonding strength between the top sheet 22 and the second sheet 35 at the low basis weight portions 21 between the sheets. Large particles and water are usually mixed in feces. In the top sheet 22 in which the particles and water are mixed, the density of an adhesive such as a hot-melt adhesive is By lowering the height of the top sheet 22, it becomes difficult for the feces to permeate the top sheet 22.例文帳に追加On the other hand, since the second sheet 35 is permeated with water from feces filtered from the top sheet 22, the density of the adhesive such as a hot-melt adhesive that joins the second sheet 35 and the core wrap sheet 25 is increased. However, it does not impede penetration.

FIG. 5 is a diagram showing a modification of the diaper 1. FIG. In the crotch portion 5 of the absorber 21 in FIG. 5, a pair of notch portions 60, 60 are formed near the rear portion 7 at both ends in the width direction. notches 60, 60 are formed. The cutouts 60 may not be two pairs, but may be one pair. The pair of notch portions 60 are formed in a chevron shape toward the inner side in the width direction at both end portions in the width direction of the absorbent body 21 . Note that the shape of the notch portion 60 is not limited to the shape shown in FIG. Further, in this modified example, the absorber 21 (absorbent core 24) is notched at each notch portion 60, but the weight per unit area of the liquid absorbent material can be made smaller than that of other portions of the absorber 21. may be formed by

In the diaper 1 shown in FIG. 5, the portion of the absorbent body 21 (absorbent core 24) sandwiched in the width direction between the pair of notch portions 60, 60 near the rear portion 7, and the stool indicator 40 are arranged in the longitudinal direction and the stool indicator 40. It has an overlapping portion in the width direction. The pair of notches 60 can prevent the absorbent core 24 from being twisted and the gap between the diaper 1 and the wearer to be suppressed, thereby suppressing leakage of excrement. Furthermore, since the portion of the absorbent core 24 that is sandwiched between the pair of cutouts 60 can securely retain feces, by arranging the feces indicator 40 at a position that corresponds to the sandwiched portion, the feces indicator 40 is easily accessible. It also improves the arrival of flights.

===Other Embodiments===
Although the embodiments of the present invention have been described above, the above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and interpret the present invention. Further, the present invention can be modified and improved without departing from its spirit, and it goes without saying 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. can be placed as By doing so, the water content of the feces permeating through the low basis weight portion 21A can be diffused in the lower layer of the absorbent body 21, and the feces indicator 40 can react in a wider range. Thereby, the visibility from the diaper 1 outer surface can be improved.

Also, the top sheet 22 may have openings. By providing the opening, the contact area between the second sheet 35 and feces can be increased, and the permeability of feces 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 elongated in the longitudinal direction in plan view shown in FIG. 1, but the shape is not limited to this. For example, a pattern shape such as a square, a rectangular shape elongated in the width direction, or a heart shape may be used.

In addition, in the regions 21B and 21B adjacent to the low basis weight portion 21A from the outside in the width direction shown in FIGS. 2 and 3, the basis weight is not limited to be constant. You may form so that a grammage may be gradually reduced toward .

Further, the basis weight of the low basis weight portion 21A in the above-described embodiment is lower than the basis weight of the regions 21B, 21B adjacent to the low basis weight portion 21A from the outside in the width direction. For example, the low basis weight portion 21A having a lower basis weight than the basis weights of both ends in the width direction of the absorbent body may be used.

Further, in the above-described embodiment, the number of low basis weight portions 21A is one at 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, by arranging a plurality of feces 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, defecation detection can be further improved.

1 Tape-type disposable diaper (absorbent article)
3 Front part 5 Crotch part 7 Rear part 12 Central strip region 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 21A' High density region 21B Region (non low basis weight part)
21C slit (area with zero basis weight)
22 Top sheet 23 Back sheet 24 Absorbent core 25 Core wrap sheet 25a Skin side part 25b Non-skin side part 26 Skin side sheet 26A Joint part 27 Exterior sheet 28 Leg circumference elastic member 29 Target tape 30 Fastening tape 35 Second sheet 40 Flight indicator 50 urine indicator 60 notch

Claims (16)

It has a longitudinal direction, a width direction, and a thickness direction in a plan view in an unfolded state,
a liquid absorbent absorbent;
An absorbent article having a stool indicator that exhibits a predetermined reaction upon contact with stool,
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,
The fecal indicator is provided on the non-skin side in the thickness direction of the absorbent body,
The feces indicator and the low basis weight portion have overlapping portions in the longitudinal direction and the width direction,
The low basis weight portion includes a slit having a basis weight of zero provided in the central portion in the width direction, and a pair of high density regions provided along the longitudinal direction on both outer sides of the slit in the width direction. has
The density of the high density region is higher than the density of the region adjacent to the low basis weight portion from the outside in the width direction.
An absorbent article characterized by: The absorbent article according to claim 1 ,
The fecal indicator is provided on the non-skin side of the high-density region in the thickness direction,
The absorbent article, wherein the feces indicator and the high density region have overlapping portions in the longitudinal direction and the width direction. The absorbent article according to claim 1 or claim 2 ,
The absorbent article, wherein the center of the low basis weight portion is located on the rear side of the center of the absorbent article in the longitudinal direction. The absorbent article according to claim 3 ,
The absorbent article, wherein the front end of the low basis weight portion is located on the rear side of the center of the absorbent article in the longitudinal direction. The absorbent article according to any one of claims 1 to 4 ,
In the low basis weight portion, an area arranged on the rear side of the center of the absorbent article in the longitudinal direction is larger than an area arranged on the front side of the center of the absorbent article in the longitudinal direction. big,
The fecal indicator has an area arranged on the rear side of the center in the longitudinal direction of the absorbent article, which is larger than an area arranged on the front side of the center in the longitudinal direction of the absorbent article. An absorbent article characterized by: The absorbent article according to any one of claims 1 to 5 ,
An absorbent article, wherein the fecal indicator reacts to urine differently than the fecal indicator reacts to feces. The absorbent article according to any one of claims 1 to 6 ,
Having a back sheet provided on the non-skin side in the thickness direction from the absorbent body,
The absorbent article, wherein the faeces indicator is positioned between the low basis weight portion and the backsheet in the thickness direction, and changes visually upon contact with faeces. The absorbent article according to any one of claims 1 to 7 ,
Further comprising a second sheet arranged to be in contact with the absorbent body in the thickness direction,
The absorbent article, wherein the second sheet and the low basis weight portion have overlapping portions in the longitudinal direction and the width direction. The absorbent article according to any one of claims 1 to 8 ,
The absorbent article, wherein the longitudinal length of the faeces indicator is longer than the longitudinal length of the low basis weight portion. The absorbent article according to any one of claims 1 to 9 ,
The absorbent article, wherein the faeces indicator is located inside both end portions of the low basis weight portion in the longitudinal direction and the width direction. The absorbent article according to any one of claims 1 to 10 ,
a top sheet provided closer to the skin in the thickness direction than the absorbent body;
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 of the absorbent body in the thickness direction,
the feces indicator is disposed between the low basis weight portion of the absorbent body and the backsheet in the thickness direction;
The absorbent article, wherein the top sheet and the second sheet are joined together in the thickness direction in a region corresponding to the low basis weight portion in the width direction. The absorbent article according to claim 11 ,
The absorbent body has an absorbent core and a core wrap sheet covering the skin side and non-skin side of the absorbent core,
The absorbent article, wherein the second sheet and the core wrap sheet are joined together in the thickness direction in a region corresponding to the low basis weight portion in the width direction. The absorbent article according to claim 12 ,
Having a back sheet provided on the non-skin side in the thickness direction from the absorbent body,
The absorbent article, wherein the core wrap sheet and the back sheet are joined together in the thickness direction in a region corresponding to the low basis weight portion in the width direction. The absorbent article according to claim 12 or 13 ,
In the width direction , the top sheet, the second sheet, the core wrap sheet, and the back sheet are joined together in the thickness direction in a region corresponding to the region where the basis weight is zero. An absorbent article characterized by: An absorbent article according to claim 14 ,
The core wrap sheet has a skin side portion covering the skin side of the absorbent core and a non-skin side portion covering the non-skin side,
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 15 ,
The feces indicator and the area having a basis weight of zero have overlapping portions in the longitudinal direction and the width direction,
a pair of urine indicators that exhibit a reaction different from the predetermined reaction upon contact with urine on the non-skin side in the thickness direction of the absorbent body;
The absorbent article, wherein the non-low basis weight portion, which is a portion other than the low basis weight portion in the absorbent body, and the pair of urine indicators have overlapping portions in the longitudinal direction and the width direction. .

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