JP4709646B2 - Disposable paper diapers - Google Patents

Description

  The present invention relates to an indicator that makes it possible to recognize the presence of excrement such as urine and feces, particularly liquid excretion from the outside by discoloration, a disposable paper diaper having a so-called notification function.

  Conventionally, when there is excretion such as urination or defecation, especially liquid excretion, various indicators that make it possible to recognize the excretion from the outside by touching the excrement etc. Disposable disposable diapers provided are known.

By providing this indicator, it is possible to save the trouble of removing it in order to confirm the presence or absence of excretion. The indicator mainly contains a colorant that reacts with color by detecting the pH of excrement, and is disposed in an absorbent article such as a disposable paper diaper by some means. For example, in Patent Documents 1 and 2 below, a hot melt adhesive containing a colorant is used as a base material bonding agent, so that the hot melt adhesive functions as an indicator.
JP-A-64-31884 JP-A-2-058585

  Certainly, according to the inventions described in Patent Documents 1 and 2, by containing a colorant in the hot melt adhesive, the function of the adhesive and the indicator is combined. In addition to being able to prevent, there is an effect that the work of attaching the indicator can be greatly saved.

  However, when the colorant is exposed to adverse conditions of high temperature and high humidity or stored in a state where it is in contact with air for a long time, the colorant is discolored despite being unused, and the function as an indicator is impaired. was there.

  Then, the main subject of this invention is providing the disposable paper diaper which prevented discoloration of the indicator before use of a disposable paper diaper.

In order to solve the above-mentioned problem, in the disposable paper diaper in which an absorbent body is interposed between the liquid-permeable surface sheet and the liquid-impermeable leak-proof sheet as the present invention according to claim 1,
An indicator showing a color reaction by contact with moisture or body fluid is applied to the inner surface side of the leak-proof sheet, and the absorbent body is surrounded by a core wrap sheet made of a nonwoven fabric ,
The indicator is a hot melt adhesive in which a water-insoluble polymer is added with a water-insoluble component such as a resin and a colorant that exhibits a color reaction upon contact with moisture or body fluid,
A coating layer is provided on a surface of the portion corresponding to the indicator on the absorber side so as to cover the indicator and prevent the indicator and the core wrap sheet from contacting each other. The coating layer is liquid-permeable and repellent. A disposable paper diaper is provided, which is constituted by a non-woven fabric having an aqueous property, or is applied by intermittent application of a structural hot melt adhesive having a non-applied portion .

  The inventors of the present application have made extensive studies on the discoloration mechanism of the indicator, and as a result, the indicator alone or the crepe paper surrounding the absorber or absorber absorbs moisture in the air, and the indicator is in a high humidity state. It was found that discoloration is likely to occur by direct contact with the crepe paper.

  Therefore, in the present invention according to claim 1, the absorbent body is surrounded by a core wrap sheet made of a nonwoven fabric, and the indicator is brought into contact with the core wrap nonwoven fabric. As a result, even if the disposable diaper is exposed to a high temperature and high humidity environment before use, and the absorber absorbs moisture and enters a high humidity state, it does not come into direct contact with the indicator and suppresses discoloration of the indicator. It becomes possible.

In the first aspect of the present invention, in addition to the contact prevention means of the indicator that surrounds the absorbent body with a core wrap sheet made of a nonwoven fabric , the coating that covers the indicator and prevents the contact between the indicator and the core wrap sheet By providing the layer, it is possible to further suppress discoloration of the indicator.

In the present invention according to claim 1, the intermittent coating having the non-applied portion indicates a coating form other than the entire surface coating, for example, various intermittent coatings such as a linear shape, a wavy shape, a dot shape, and a mesh shape. Is possible.

As the present invention according to claim 2, before Kibomo sheet with moisture permeability made of a microporous sheet of 6000~12000g / m ² · 24hr,
The disposable paper diaper according to claim 1, wherein a micropore is closed by applying a coating agent other than the indicator to a portion corresponding to the indicator of the microporous sheet.

As the present invention according to claim 3, wherein the structural hot melt adhesive, at a coating weight of less than 30 g / m ² exceed 5 g / m ^2, and characterized in that it is applied by intermittent application with non-coated portion A disposable paper diaper according to any one of claims 1 and 2 is provided.

As the present invention according to claim 4, wherein the coating layer is a disposable paper diaper according to claim 1, characterized in that is covered at a ratio of 70% or less with respect to the application surface of the indicator Provided.

The disposable paper diaper according to any one of claims 1 to 4 , wherein at least the indicator contact surface side core wrap sheet is subjected to water repellent treatment as the present invention according to claim 5 .

  As described above, according to the present invention, even if the disposable diaper is exposed to high temperature and high humidity before use or stored in contact with air for a long period of time, it can suppress discoloration of the indicator until use. Will be able to.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a product state appearance view of a disposable paper diaper 1 according to the present invention, and FIG. 2 is a developed view thereof.

  As shown in FIG. 1 and FIG. 2, a disposable paper diaper 1 (hereinafter simply referred to as a paper diaper) is placed between a liquid-permeable surface sheet 11 made of a nonwoven fabric or the like and a leak-proof sheet 12 made of polyethylene or the like. Absorbent body 10 having an absorbent body 13 such as fibrous pulp interposed therebetween, a core wrap sheet 14 made of a nonwoven fabric surrounding the absorbent body 13, and an exterior sheet integrally provided on the outer surface side of the leak-proof sheet 12 20 is a pants-type paper diaper having a structure in which a waist opening and a pair of left and right leg openings are formed by joining the front body F and the back body B of the exterior sheet 20 at both sides in a product state. is there.

  Further, an indicator 15 made of a hot melt adhesive containing a colorant is applied to a predetermined area on the inner surface side of the leak-proof sheet 12 as will be described later. This indicator 15 makes it possible to recognize from the outside that there has been excretion by touching this excrement etc. when it is excreted, such as urination or defecation, in particular liquid excretion, and is discolored. is there.

(Structure of the absorbent main body 10)
First, an example of the structure of the absorbent main body 10 will be described in detail based on FIG. 2 and FIG.

  As described above, the absorbent main body 10 has a structure in which an absorbent body 13 such as cotton-like pulp is interposed between a liquid-permeable surface sheet 11 made of a nonwoven fabric or the like and a leak-proof sheet 12 made of polyethylene or the like. And absorbs and retains body fluids.

  In the illustrated example, the absorbent body 13 is formed with a substantially square shape in plan view, and the width dimension thereof is a dimension width that does not give the wearer a feeling of gore by hitting the crotch portion. The absorber 13 is surrounded by a core wrap sheet 14. As the absorber 13, it is desirable to use an airlaid absorber that can reduce the bulk.

  As the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid-permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable top sheet 11 extends to the back side of the absorbent body 13 around the side edge of the absorbent body 13.

The leak-proof sheet 12 covering the back surface side (non-skin contact surface side) of the absorbent body 13 is made of a liquid-impervious plastic sheet such as polyethylene or polypropylene, but in recent years has moisture permeability from the viewpoint of preventing stuffiness. Those are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility. Specifically, it is desirable to use a liquid-impervious sheet having a moisture permeability measured according to JIS Z0208 of 6000 to 12000 g / m ² · 24 hr, preferably 8000 to 10000 g / m ² · 24 hr.

  On the other hand, the gathered nonwoven fabric 16 that forms the three-dimensional gathered BS is a nonwoven fabric made into a double sheet by folding, and the side edge portion of the absorbent body 13 that is rolled up by the liquid-permeable surface sheet 11 is further rolled up from the upper side. The absorber 13 extends to the back side and is bonded. More specifically, the gathered nonwoven fabric 16 has a three-dimensional gather BS forming portion left in the middle portion in the longitudinal direction of the paper diaper, and a range extending from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. Further, at the front and rear end portions in the longitudinal direction, the section from the intermediate portion in the width direction to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and the portion forming the three-dimensional gather BS is the absorber. While being folded at the upper surface portion of 13, it is bonded by a hot melt adhesive or the like.

  In the gathered nonwoven fabric 16 formed of the double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 17, 17... The thread-like elastic elastic members 17, 17... Are for forming a three-dimensional gather BS by raising a non-woven fabric portion protruding from the absorber side edge portion by elastic elastic force in a product state.

  The leak-proof sheet 12 enters the double sheet-like gathered nonwoven fabric 16 and constitutes a leak-proof wall on the lower end side of the three-dimensional gather BS. As the leak-proof sheet 12, it is desirable to use a transparent or translucent sheet so that the indicator 15 applied on the inner surface side can be visually observed from the outside. In the case of translucency, a plastic film is preferably used which is internally added with pigments and fillers such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc, and barium sulfate. .

  As the thread-like elastic elastic member 17, a material such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, or the like that is usually used can be used. Further, in order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less and the tension is 150 to 350%. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

  In the same manner as the liquid-permeable surface sheet 11, the material fiber constituting the gathered nonwoven fabric 16 is not only synthetic fibers such as polyethylene or polypropylene, but synthetic fibers such as polyester or polyamide, and regenerated fibers such as rayon and cupra. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a non-woven fabric with a low basis weight and excellent air permeability. Furthermore, with respect to the gathered nonwoven fabric 16, in order to prevent permeation of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.

  As shown in FIG. 3, the absorbent main body 10 and the exterior sheet 20 are integrally bonded to the upper surface side of the exterior sheet 20 by an adhesive such as hot melt. Then, the absorbent main body 10 and the outer sheet 20 are folded in the front-rear direction, and both sides thereof are joined to each other by heat welding or hot melt adhesive, thereby assembling the pants-type paper diaper 1 shown in FIG. It is done.

(Structure of exterior sheet 20)
Next, the structure of the exterior sheet 20 will be described in detail with reference to FIGS. 3 and 4. The exterior sheet 20 is a two-layer nonwoven fabric sheet in which the upper nonwoven fabric 20A and the lower nonwoven fabric 20B are bonded with a hot melt adhesive or the like, and various elastic elastic members are hot between the upper nonwoven fabric 20A and the lower nonwoven fabric 20B. It is bonded with a melt adhesive or the like to give stretchability. The planar shape forms a pseudo hourglass shape as a whole by the concave leg circumference cut lines 29 for forming leg openings on both sides of the middle.

  In the exterior sheet 20 according to the present invention, as the elastic elastic member, as shown in the developed shape of FIG. 4, waist elastic elastic members 24, 24... Further, the back body B includes a plurality of waist elastic elastic members 25, 25,... Which are arranged along the horizontal direction at intervals in the vertical direction and for forming shearing around the waist.

  The waist elastic elastic members 24, 24... Are arranged in the vicinity of the waist opening edge in the range of the side joint edge 21 where the front body F and the back body B are joined, with an interval in the vertical direction. A plurality of elastic rubber elastic elastic members for attaching a disposable diaper to the body by applying an elastic force to tighten around the waist of the body. As the waist elastic elastic member 24, thread rubber is used in the illustrated example. However, for example, a tape-like elastic member may be used.

  The waist elastic elastic members 25, 25... Extend from the upper position to the lower position excluding the waist opening edge 23 of the side joint edge 21, or from the side joint edge 21 to the crotch side as shown in the figure. It is a rubber elastic elastic member that is arranged along the horizontal direction at intervals in the vertical direction over the range, and applies a horizontal elastic force to the waist part of the front body F and the back body B, respectively. This is for forming the waistline shearing zones K1, K2. It should be noted that the boundary between the waist elastic elastic members 24, 24... And the waist elastic elastic members 25, 25. For example, even if the number of elastic elastic members arranged in the horizontal direction with an interval in the vertical direction between the front body F and the back body B cannot be specified, some of the upper elastic members 24 on the upper side are provided. As long as the remaining elastic elastic member functions as the waist elastic elastic member 25.

  Particularly in the present invention, in order to prevent the absorbent body 13 from being contracted, the waist elastic members 25 are not continuous in the vicinity of the center where the absorbent main body is joined, and are elastically stretched across the absorbent main body 10. The members 25 are cut to be discontinuous, and the stretchability by the waist elastic members 25 is not provided. For example, as shown in Japanese Patent Application Laid-Open No. 2000-26015 and Japanese Patent Application Laid-Open No. 2002-273808, discontinuity of the elastic elastic member is performed by arranging various elastic elastic members on the exterior sheet 20 and then embossing cutter roll and anvil roll. The outer sheet may be passed between the two and the elastic stretchable member existing within a predetermined range may be finely cut by pressing or heating with the embossing cutter roll.

(Structure of indicator 15)
Next, the structure of the indicator 15 will be described in detail. In the present invention, the indicator 15 is an adhesive containing a colorant that exhibits a color reaction upon contact with water such as a body fluid and / or a colorant that exhibits a color reaction by detecting pH in the water. It is comprised by the agent. Examples of colorants that exhibit a color reaction upon contact with moisture such as body fluids include water-soluble, water-decomposable dyes or leuco dyes and phenolic compounds, acid substances, electron-accepting substances that cause coloration of the leuco dyes, etc. It is possible to use a colorant comprising a developer.

  Various known adhesives can be used as the adhesive. Hereinafter, the case where a hot melt adhesive is used will be described in detail as an example.

  By using a hot-melt adhesive containing a colorant as the indicator 15, it is possible to prevent the colorant from diffusing and leaching, and the indicator 15 can be easily implemented in-line compared to the case where a sheet-like indicator is provided. The attachment work process can be greatly saved.

  The component of the indicator 15 is obtained by adding a water-insoluble component made of a resin or the like and a colorant to a water-soluble polymer. For example, a water-soluble polymer comprising a polyethylene glycol molecular weight of 100 to 500, polyvinyl pyrrolidone, a vinyl acetate copolymer, and a water-soluble polyester, a highly polar tackifying resin and a water-insoluble component of a plasticizer, and the acidity of the liquid in contact It comprises a colorant that indicates the degree of alkalinity (pH) by discoloration.

The indicator 15 shown in FIGS. 2 and 3 shows the application region of the hot melt adhesive described above. This area | region is an area | region where the contact with the excretion absorbed by the absorber 13 is performed efficiently. The indicator 15 is formed on the inner surface side of the leak-proof sheet 12 by being applied in a planar shape, a strip shape or a number of streaks. At this time, the application amount of the indicator hot melt adhesive is preferably ²⁰ to 30 g / m ² . When the amount is less than 20 g / m ² , the function as an indicator is impaired, and when it is more than 30 g / m ^2, a feeling of stickiness due to curing of the adhesive occurs.

[Preventing discoloration of indicator 15]
Next, a countermeasure example for the problem that the indicator 15 is discolored before use will be described in detail.

  In the present invention, as described above, the core wrap sheet 14 surrounding the absorber 13 is replaced by a hydrophobic nonwoven fabric instead of one having moisture absorption performance such as conventionally used crepe paper, The indicator 15 is prevented from coming into direct contact with a hygroscopic material such as an absorber or crepe paper.

  Further, in addition to the basic configuration in which the absorbent body 13 is surrounded by the core wrap sheet 14 made of a nonwoven fabric, the following measures are taken for the purpose of preventing contact between the indicator 15 and moisture as much as possible.

(Example 1 of limiting moisture contact to indicator 15)
A first embodiment for restricting moisture contact to the indicator 15 will be described with reference to FIGS. 6 is a cross-sectional view taken along the line VI-VI in FIG. 2, and FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 6, and a hot-melt adhesive for the indicator 15 and a hot-melt adhesive generally used as an adhesive. It is the schematic diagram which showed an example about the application | coating form of 18 (it is called the structural hot-melt-adhesive in order to distinguish with the said hot melt for indicators in this invention).

  In this embodiment, the adhesive 15 is coated with the leak-proof sheet 12 coated with the indicator 15 and the core wrap sheet 14 surrounding the absorber 13 so that the indicator 15 is concealed by the structural hot melt adhesive 18. It is what I did. As a result, a part of the indicator 15 is concealed by the structural hot melt adhesive 18 so that direct contact between the indicator 15 and the core wrap sheet 14 can be prevented, and the indicator due to moisture absorbed in the absorber 13 It becomes possible to suppress 15 discoloration. The structural hot-melt adhesive 18 is preferably applied in the form of curtain fiber as shown in the illustrated example over the entire surface of the core wrap sheet 14, and in another form, spiral, wavy, streaky or dot-like It may be applied in various forms. Further, for example, intermittent coating having various non-applied portions such as a line shape, a wave shape, a dot shape, and a mesh shape is possible.

  In this case, the structural hot melt adhesive 18 is provided with the indicator 15 by the structural hot melt adhesive 18 so that excrement such as urine absorbed by the absorbent body 13 can come into contact with the indicator 15 when the disposable diaper 1 is used. The concealment rate is 70% or less. When the concealment rate exceeds 70%, the contact area between the excrement and the indicator 15 is too small, and the discoloration may not be clearly recognized from the outside.

(Example 2 of limiting moisture contact to indicator 15)
A second embodiment for restricting moisture contact with the indicator 15 will be described with reference to FIG.

  In the second embodiment, at least the core wrap sheet 14b on the side in contact with the indicator 15 among the core wrap sheet 14 made of a nonwoven fabric is a water repellent treated nonwoven fabric.

  Specifically, the example shown in FIG. 8 (A) is an example using core wrap sheets 14a ′ and 14b ′ in which the nonwoven fabric is subjected to water repellency treatment on the upper surface side and the lower surface side of the absorbent body 13, and FIG. The example shown in B) is an example using a core wrap sheet 14b ′ in which the upper surface side of the absorbent body 13 is a normal nonwoven fabric and the nonwoven fabric is subjected to water repellency treatment on the lower surface side.

  The water repellent treatment can be performed, for example, by coating the fiber with a silicon-based, paraffin metal-based, alkylchromic water-based water repellent or the like.

(Third example of moisture contact restriction on indicator 15)
A third embodiment for restricting moisture contact with the indicator 15 will be described with reference to FIG.

  In the third embodiment, as shown in FIG. 9A, an opening 13a is formed in a portion corresponding to the indicator 15 of the absorbent body 13 in order to prevent contact between the indicator 15 and the absorbent body 13 having moisture retention. It is intended to be provided. As a result, even when the absorbent body 13 is exposed to a high temperature and high humidity environment before use of the paper diaper and absorbs the humidity in the air, the indicator 15 does not come into contact with the diaper and the discoloration of the indicator 15 can be prevented. It becomes like this. As shown in FIG. 9B, a concave groove 13b may be formed in the absorber 13 corresponding to the indicator 15 to prevent contact with the indicator 15.

(Example 4 of limiting moisture contact to indicator 15)
The 4th example which restrict | limits the moisture contact to the indicator 15 is demonstrated based on FIG.

  In the fourth embodiment, as shown in FIG. 10, in order to prevent the contact between the indicator 15 and the absorbent 13 having moisture retention, the indicator 15 is concealed between the indicator 15 and the core wrap sheet 14. Only a portion corresponding to the indicator 15 is provided with a concealment sheet 19 made of a nonwoven fabric or the like for reducing contact with outside air and suppressing discoloration of the indicator 15. The concealment sheet 19 is preferably a liquid-permeable and water-repellent sheet for preventing discoloration of the indicator 15 before use and for prompt discoloration due to contact with excrement during use.

  Further, the concealment sheet 19 may be provided with openings such as a plurality of pores and slits so as to contact the indicator 15 with excrement. At this time, it is preferable that the opening provided in the concealment sheet 19 is covered at a ratio of 70% or less with respect to the application surface of the indicator 15. When the concealment rate exceeds 70%, the contact area between the excrement and the indicator 15 is too small, and the discoloration may not be clearly recognized from the outside.

With respect to Embodiment 1 in which the moisture contact with the indicator 15 is limited, a comparative experiment of the moisture resistance and the indicator function with respect to the coating amount and the coating pattern of the structural hot-melt adhesive 18 was performed. In the moisture resistance experiment, assuming that the disposable diaper is stored in a high temperature and high humidity state, after exposing it to a high temperature and high humidity state at a temperature of 40 ° C. and a humidity of 90% for 1 hour, the discoloration state of the indicator 15 is compared. In the indicator function experiment, assuming the use of a disposable diaper, the discoloration state of the indicator 15 when 30 cc of liquid flowed down was compared. As a result, as shown in Table 1, color change function of the moisture resistance and indicators when the structural hot melt adhesive 18 and curtain coating at a coverage of less than 30 g / m ² exceed 5 g / m ² is It became clear that it was sufficiently secured. In Table 1, ○ for moisture resistance indicates no discoloration, Δ indicates a slight discoloration, ○ for an indicator function indicates discoloration, Δ indicates that discoloration hardly occurs, and × indicates no discoloration.

[Other examples]
(1) In the above embodiment, the present invention has been described by taking a pants-type disposable paper diaper as an example, but the present invention can be similarly applied to a tape-type disposable diaper. Moreover, in the said form example, although it was set as the paper diaper structure of the type which assembles the absorptive main body 10 and the exterior sheet | seat 20 at the last process, this invention is between a liquid-permeable surface sheet and a liquid-impermeable leak-proof sheet. The present invention can be applied to general paper diapers in which an absorber is interposed.

(2) In the above-described embodiment, the liquid-impervious leak-proof sheet 12 is formed of a microporous sheet from the viewpoint of preventing stuffiness, and has moisture permeability (breathability) throughout. By applying an adhesive or other coating agent only to the portion corresponding to 15, the pores of the microporous sheet can be blocked, and moisture permeability (breathability) can be reduced or eliminated.

(3) In the above embodiment, in order to reduce the contact area with the outside air and suppress the discoloration of the indicator 15, the adhesion between the leak-proof sheet 12 coated with the indicator 15 and the core wrap sheet 14 surrounding the absorber 13. In this case, the hot melt adhesive is used as the structural hot melt adhesive 18 which is a coating agent for setting the concealment ratio of the indicator 15 to 70%, but other adhesive may be used. .

(4) In the above embodiment, the indicator 15 that detects and changes the color of body fluid is constituted by a hot-melt adhesive containing a colorant. However, the colorant is contained in another adhesive. Alternatively, the indicator 15 may be formed by directly applying a colorant.

It is a product state appearance view of disposable paper diaper 1 concerning the present invention. It is the development view. It is an exploded view of the disposable paper diaper. FIG. 3 is a development view of the exterior sheet 20. It is a front view which shows a product state. It is the VI-VI line arrow directional view of FIG. 2 which shows the form example 1 of the water | moisture-content restriction | limiting which concerns on a 1st form example. FIG. 7 is a schematic view showing an application form example of the indicator 15 and the structural hot-melt adhesive 18 as viewed in the direction of arrows VII-VII in FIG. 6. It is the VI-VI line arrow directional view of FIG. 2 which shows the form example of the moisture contact restriction | limiting which concerns on a 2nd form example. It is the VI-VI line arrow directional view of FIG. 2 which shows the form example of the moisture contact restriction | limiting which concerns on a 3rd form example. It is the VI-VI line arrow directional view of FIG. 2 which shows the form example of the moisture contact restriction | limiting which concerns on another form example.

  DESCRIPTION OF SYMBOLS 1 ... Disposable paper diaper, 10 ... Absorbent main body, 11 ... Liquid-permeable surface sheet, 12 ... Leak-proof sheet, 13 ... Absorber, 14 ... Core wrap sheet, 15 ... Indicator, 16 ... Gathered nonwoven fabric, 17 ... Yarn elastic expansion and contraction 20 ... exterior sheet, 20A ... upper layer nonwoven fabric, 20B ... lower layer nonwoven fabric, 21, 22 ... side joint edge, 23 ... around waist opening, 24 ... waist elastic elastic member, 25 ... waist elastic elastic member, 29 ... leg leg cut line, F ... front body, B ... back body

Claims (5)

In disposable paper diapers in which an absorbent is interposed between a liquid-permeable surface sheet and a liquid-impervious leak-proof sheet,
An indicator showing a color reaction by contact with moisture or body fluid is applied to the inner surface side of the leak-proof sheet, and the absorbent body is surrounded by a core wrap sheet made of a nonwoven fabric ,
The indicator is a hot melt adhesive in which a water-insoluble polymer is added with a water-insoluble component such as a resin and a colorant that exhibits a color reaction upon contact with moisture or body fluid,
A coating layer is provided on a surface of the portion corresponding to the indicator on the absorber side so as to cover the indicator and prevent the indicator and the core wrap sheet from contacting each other. The coating layer is liquid-permeable and repellent. A disposable paper diaper constituted by a non-woven fabric having water or by being applied with a structural hot melt adhesive by intermittent application having a non-application part . The leak-proof sheet is composed of a microporous sheet having a moisture permeability of 6000 to 12000 g / m ² · 24 hr,
The disposable paper diaper according to claim 1, wherein a micropore is closed by applying a coating agent other than the indicator to a portion corresponding to the indicator of the microporous sheet. Hot melt adhesives for the structure of the coating amount of less than 30 g / m ² exceed 5 g / m ^2, to claim 1, characterized in that it is applied by intermittent application with non-coated portion The disposable disposable diaper described. The disposable diaper according to any one of claims 1 to 3 , wherein the coating layer is covered at a rate of 70% or less with respect to the application surface of the indicator. The disposable paper diaper according to any one of claims 1 to 4, wherein at least the indicator contact surface side core wrap sheet is subjected to water repellent treatment.

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