JP5888851B2 - Disposable diapers - Google Patents

Description

  The present invention relates to an unfolded or pants-type disposable diaper, and more particularly to a disposable diaper having an indicator that changes color by contact with moisture and visually informing that urination has occurred.

  Disposable diapers are known that have a liquid-permeable top sheet that forms a skin-facing surface, a liquid-impermeable back sheet that forms a non-skin-facing surface, and an absorber disposed between the two sheets. Yes. Moreover, what is comprised as an absorbent core including a hydrophilic fiber such as pulp and / or a water-absorbing polymer and a core wrap sheet covering the absorbent core is known. . Some disposable diapers have an indicator that changes color by contact with moisture, and has a function of visually informing the wearer and / or their guardians that urine has been excreted when worn. As the indicator, a pH indicator or the like whose color changes before and after contact with moisture is used.

  Regarding a disposable diaper provided with an indicator, for example, Patent Document 1 includes an absorber and a back sheet disposed on the non-skin facing surface side of the absorber, and the indicator is provided between the absorber and the back sheet. In the absorbent article arranged, the back sheet is composed of a moisture-permeable sheet on the absorber side and an exterior sheet on the outside, and the moisture-permeable sheet contains colored inorganic powder (for example, yellow calcium carbonate) It is described that the moisture-permeable sheet is colored yellow. [0015] of Patent Document 1 also describes that a mount or the like may be provided between the absorber and the indicator. According to Patent Literature 1, the absorbent article described in Patent Literature 1 has both a yellow color before the color change of the indicator and a moisture permeable sheet or a back sheet in the vicinity of the indicator. When the indicator changes to turquoise due to contact with urine etc., the blue-green line appears in the yellowish back sheet, and the wearer and guardian It is said that the color change can be clearly recognized visually.

JP 2009-254597 A

  In the disposable diaper having a function of visually informing that urination or the like has occurred by the indicator, further improvement in the visibility of the indicator after discoloration is desired. In the absorbent article described in Patent Literature 1, the back sheet (moisture permeable sheet) is colored yellow to improve the visibility of the indicator after discoloration. Generally, this type of absorbent article is used. There is a tendency that white with a clean feeling is preferred for (hygiene products), and the absorbent article described in Patent Document 1 having a yellow component has room for improvement in terms of cleanliness. In particular, when a pH indicator is used as an indicator, it is desired that the pH indicator as an indicator be vividly discolored with good response by a small amount of water (urine). The articles have room for improvement in terms of the responsiveness and discoloration of the indicator.

  Therefore, the subject of this invention is providing the disposable diaper which is easy to visually recognize that there existed excretion, such as urine.

  The present invention includes an absorbent core and a back sheet disposed on the non-skin facing surface side of the absorbent body, and the absorbent core covers the absorbent core and at least the non-skin facing surface of the absorbent core. A disposable diaper configured to include a sheet, wherein an indicator that changes color by contact with moisture is disposed on a portion of the skin facing surface of the back sheet that overlaps the absorbent core in plan view of the disposable diaper. By providing a disposable diaper in which white powder is sprayed corresponding to the indicator on the surface of the core wrap sheet facing the non-skin facing surface of the absorbent core. It has been solved.

  According to the disposable diaper of the present invention, the indicator discolored by contact with moisture contained in urine or other excretion liquid can be easily visually confirmed from the outside, and it is easily visually confirmed that urine or the like has been excreted. Can be recognized.

FIG. 1 is a diagram showing an embodiment of the disposable diaper of the present invention, and is a schematic plan view on the skin facing surface side (surface sheet side) showing a state where the elastic members of each part are expanded and expanded in a planar shape. . 2 is a schematic cross-sectional view showing a cross section taken along the line II (cross section in the width direction) of FIG. FIG. 3 is a schematic plan view of a facing surface (absorbent core facing surface) of the core wrap sheet in the disposable diaper shown in FIG. 1 with the non-skin facing surface of the absorbent core.

  Hereinafter, the disposable diaper of this invention is demonstrated, referring drawings based on the preferable one Embodiment. The diaper 1 of this embodiment is equipped with the back surface sheet 3 distribute | arranged to the non-skin opposing surface side of the absorber 4 and the absorber 4, as shown in FIG.1 and FIG.2, and the absorber 4 is an absorptive core. 40 and a core wrap sheet 41 that covers at least the non-skin facing surface 40b of the absorbent core 40.

  More specifically, the diaper 1 of the present embodiment is a so-called unfolded disposable diaper. As shown in FIGS. 1 and 2, a liquid-permeable surface sheet 2 that forms a skin facing surface, a non-skin facing surface, It has a liquid-impermeable or water-repellent (hereinafter collectively referred to as “liquid-impermeable”) back sheet 3 to be formed, and an absorbent body 4 disposed between the two sheets 2 and 3 and is substantially vertically long. Is formed. Each of the top sheet 2, the back sheet 3, and the absorber 4 has a vertically long shape that is long in one direction X. Each of the top sheet 2 and the back sheet 3 has a size larger than that of the absorber 4, and extends outward from the peripheral edge of the absorber 4. As shown in FIG. 2, the width of the top sheet 2 in the width direction Y is smaller than the width of the back sheet 3 in the width direction Y.

  As shown in FIG. 1, the diaper 1 has, in the longitudinal direction X, a back side portion A disposed on the back side of the wearer at the time of wearing, and a ventral side portion B disposed on the abdomen side of the wearer at the time of wearing, And a crotch part C on which the wearer's crotch is arranged when worn. The crotch part C includes an excretion part facing part that is disposed so as to face the wearer's excretion part when worn, and is located at the central part in the longitudinal direction X of the diaper 1. The diaper 1 has an hourglass shape in which both side edges of the crotch part C are curved in an inward arc shape, and the center part in the longitudinal direction X is inwardly bounded in a plan view as shown in FIG. Yes.

  In the present specification, the skin facing surface is a surface of the disposable diaper or a component thereof (for example, the absorbent body 4) that is directed toward the wearer's skin when the disposable diaper is worn, and the non-skin facing surface is a disposable diaper or It is the surface of the component that is directed to the side opposite to the skin side (clothing side) when the disposable diaper is worn. Moreover, a longitudinal direction is a direction along the long side of a disposable diaper or its component member, and a width direction is a direction orthogonal to this longitudinal direction. In the figure, the direction indicated by the symbol X is the longitudinal direction of the diaper 1 (absorber 4, absorbent core 40), and the direction indicated by the symbol Y is the width direction of the diaper 1 (absorber 4, absorbent core 40). It is.

  The absorbent core 40 constituting the absorbent body 4 has both side edges of the crotch part C curved in an inward arc shape, and the center part in the longitudinal direction X is bound inward in a plan view as shown in FIG. It has an hourglass shape. Moreover, the core wrap sheet | seat 41 which comprises the absorber 4 is one continuous sheet | seat, and covers the whole skin opposing surface 40a of the absorptive core 40, as shown in FIG. Is extended outward from both side edges along the longitudinal direction X in the width direction Y, and the extended portion is wound down below the absorbent core 40 to cover the entire non-skin facing surface 40b of the absorbent core 40. Is covered.

  As shown in FIG. 1 and FIG. 2, side sheets 62 each having a thread-like elastic member 61 fixed in an extended state are arranged on one side edge of each side part along the longitudinal direction X of the diaper 1. A pair of three-dimensional gathers are formed in the crotch part C when worn. Further, between the top sheet 2 and the back sheet 3 in the left and right leg portions disposed around the wearer's legs, a thread-like elastic member 63 is disposed in a stretched state along the longitudinal direction X. A pair of leg gathers is formed in the leg portion at the time by the contraction of the elastic member 63. A belt-like elastic member 64 extends along the width direction Y between the top sheet 2 and the back sheet 3 at the waist portions (end portions in the longitudinal direction X) of the back side portion A and the ventral side portion B. It is arranged in a state and a waist gather is formed. The pair of side sheets 62 and 62, the top sheet 2, the absorber 4, the elastic members 63 and 64, and the back sheet 3 are joined to each other by a known joining means such as a hot-melt adhesive.

  As shown in FIG. 1, a pair of fastening tapes 8, 8 are provided on both side edges along the longitudinal direction X of the back side A of the diaper 1. More specifically, the both sides along the longitudinal direction X of each of the back side portion A and the ventral side portion B extend outward in the width direction Y from both side edge portions along the longitudinal direction X of the absorbent body 4. Side flaps 7 and 7 are formed, and a fastening tape 8 is attached to each side flap 7 so as to extend outward in the width direction Y. A fastening part 81 made of a male member of a mechanical surface fastener is attached to the fastening tape 8.

  In addition, a non-skin facing surface of the ventral side B of the diaper 1 is formed with an attachment region 9 made of a female member of a mechanical surface fastener. The to-be-attached region 9 is formed by bonding and fixing a female member of a mechanical surface fastener to the non-skin facing surface of the back sheet 3 by a known joining means (for example, an adhesive or heat seal). The fastening part 81 of the tape 8 can be detachably fastened.

  As shown in FIG. 2, the portion of the skin facing surface 3a (absorber facing surface) of the back sheet 3 that is overlapped with the absorbent core 40 in a plan view of the diaper 1 shown in FIG. An indicator 10 is arranged. The indicator 10 is formed by applying an indicator composition containing a pH indicator or the like to a predetermined portion of the skin facing surface 3a of the back sheet 3 by a known application means.

  It is preferable that the indicator 10 is arranged at least in the excretory part facing part. As shown in FIG. 3, the indicator 10 in the present embodiment extends over the entire length in the longitudinal direction X of the crotch part C including the excretory part-facing portion at the center in the width direction Y of the absorbent core 40 (diaper 1). It is also arranged in the portion near the crotch C of each of the back side portion A and the abdominal side portion B, and is a continuous straight line extending in the longitudinal direction X of the absorbent core 40 (diaper 1) in plan view. Is formed. In the present embodiment, a plurality (three) of linear indicators 10 are arranged at a predetermined interval in the width direction Y. FIG. 3 is a schematic plan view of an opposite surface (absorbent core facing surface) 41a of the core wrap sheet 41 to the non-skin facing surface 40b of the absorbent core 40. Reference numeral 41ab denotes the facing of the absorbent core. A portion of the surface 41a corresponding to the indicator 10 (a portion located above the indicator 10; hereinafter also referred to as an indicator-corresponding portion) is shown, but it also indicates an arrangement position and a plan view shape of the indicator 10. FIG. 3 shows the absorbent core 40 from the viewpoint of easy explanation.

  The dimensions of the indicator 10 are not particularly limited, but in the case of a straight line as shown in FIG. 3, for example, the length in the longitudinal direction X is 50 to 300 mm, and the length in the width direction Y is 0.5 to 10.0 mm. Can do. The interval between the two linear indicators 10 adjacent in the width direction Y is preferably 0.5 to 5.0 mm. The number of linear indicators 10 is preferably 1 to 3.

  As the indicator 10, an indicator 10 containing a color-changing substance that changes color by contact with moisture contained in excretion fluid such as urine is used. Such a discoloring substance includes a pH indicator. As the pH indicator, those usually used in absorbent articles such as disposable diapers can be used without particular limitation, for example, bromophenol blue, methyl orange, arizan S, bromocresol green, methyl red, meryl cresol purple Resazurin and the like can be used. The content of the color changing substance (pH indicator) in the indicator 10 is preferably 0.1 to 5.0% by mass.

  In addition to the discoloring substance (pH indicator), the indicator 10 further includes citric acid, succinic acid, gluconic acid, lactic acid, fumaric acid, malic acid, oxalic acid, acetic acid, formic acid, uric acid, sulfuric acid, hydrochloric acid, phosphoric acid, Acidic substances such as nitric acid (developer); surfactants such as anionic, nonionic, cationic, and amphoteric; alkyl sulfate ester salt, polyoxyethylene alkyl sulfate ester salt, alkylbenzene sulfonate, fatty acid salt, polyoxy Ethylene alkyl ether, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, glycerin fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkylamine, alkyl alkanolamide, a Kiruamin salts, quaternary ammonium salts, alkyl betaines, can be contained alkylamino hexa de like.

  As one of the main features of the diaper 1 of this embodiment, as shown in FIG.2 and FIG.3, the opposing surface (henceforth an absorptive core) with the non-skin opposing surface 40b of the absorptive core 40 in the core wrap sheet | seat 41 is shown. The point that the white powder 11 is scattered on the indicator 41 a corresponding to the indicator 10 is mentioned. The white powder 11 is fixed on the absorbent core facing surface 41a by an adhesive (not shown) such as a hot-melt adhesive applied on the absorbent core facing surface 41a. May be unintentionally detached from the absorbent core facing surface 41a and entering the absorbent core 40. The adhesive that fixes the white powder 11 on the absorbent core facing surface 41a is also an adhesive for joining the absorbent core 40 and the core wrap sheet 41, and has a predetermined amount over the entire area of the absorbent core facing surface 41a. It is applied in an application pattern (for example, a stripe shape in which a plurality of linear adhesive application portions extending in the longitudinal direction X are formed at predetermined intervals in the width direction Y).

  As shown in FIG. 3, the white powder 11 has a continuous band shape over the entire length of the portion corresponding to the central portion in the width direction Y of the absorbent core 40 on the absorbent core facing surface 41 a of the core wrap sheet 41. The white powder 11 has a continuous strip-shaped spraying portion 11a, which has all the indicators 10 (three linear indicators 10) arranged on the skin facing surface 3a of the back sheet 3 in plan view. ). That is, the white powder 11 is dispersed so as to cover the entire region of the indicator 10 corresponding portion 41ab on the absorbent core facing surface 41a.

  Thus, the white powder 11 is sprayed on the absorbent core facing surface 41a of the core wrap sheet 41 in correspondence with the indicator 10 arranged on the back sheet 3 (so as to overlap the indicator 10 in plan view). Thus, when a diaper 1 is worn by a third party (such as a guardian of the wearer of the diaper 1) when the diaper 1 is viewed from the outside, the indicator 10 is a portion whose white color is emphasized by the dispersion of the white powder 11. When the indicator 10 is discolored by contact with moisture contained in excretion fluid such as urine, the color of the discolored indicator 10 is contrasted with the white of the white powder 11 as the background. Since it becomes clear well, the discolored indicator 10 can be easily visually confirmed from the outside.

  In contrast, when the white powder 11 is contained in the back sheet 3 (resin film) as described in Patent Document 1 without being sprayed on the core wrap sheet 41 as in the present embodiment. Since the white powder 11 is positioned in front of the indicator 10 when the diaper 1 is viewed from the outside, the contrast effect due to the white powder 11 described above cannot be obtained, and the visibility of the indicator 10 that has changed color is visible. Does not improve. Further, when the white powder 11 is contained in the back sheet 3, it is necessary to make the particle size and other characteristics of the white powder 11 uniform to some extent from the viewpoint of moldability and quality stability of the back sheet 3. When the range of selection of the body 11 is limited to some extent, when spraying on the core wrap sheet 41 as in the present embodiment, it is not particularly necessary to make the particle size of the white powder 11 uniform, and the white powder 11 This is advantageous in terms of manufacturing cost and the like.

  As the white powder 11, an inorganic substance which is white and insoluble or hardly soluble in water (poor in water absorbability) is preferably used. For example, talc, calcium carbonate, gypsum, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, carbonate Examples include barium, magnesium sulfate, barium sulfate, calcium phosphate, aluminum hydroxide, zinc oxide, titanium oxide, carbon black, aluminum powder, iron powder, etc., one of these alone or two or more They can be used in combination. The whiteness of the white powder 11 measured according to JIS-P8123 is preferably 80% or more, more preferably 85 to 95%.

  As the white powder 11, from the viewpoint of improving the responsiveness of the indicator 10 and the sharpness of the discolored indicator 10, a powder that changes the pH of water in contact with the white powder 11 can be used. When the white powder 11 is accompanied by such a pH change, the pH of the water is located below the white powder 11 when water contained in urine or the like comes into contact with the white powder 11. The indicator 10 (pH indicator) enters a pH range in which the color changes. Thus, the moisture whose pH has changed due to the contact with the white powder 11 moves downward in the diaper 1 and comes into contact with the indicator 10, so that the indicator 10 is quickly and clearly discolored. Combined with the contrast effect by the powder 11, it becomes easier to visually recognize that urine or the like was excreted.

  Examples of the white powder 11 that accompanies the pH change include powders such as talc, calcium carbonate, and barium sulfate. One of these can be used alone, or two or more thereof can be used in combination. Any of these powder particles (white powder) shifts neutral (pH 7) moisture to the alkaline side (more than pH 7) by contact with the powder particles.

  Examples of the combination of the indicator 10 and the white powder 11 that are preferably used in the present invention include a combination using the indicator 10A having the following composition as the indicator 10 and using talc as the white powder 11. The indicator 10A is yellow before it comes into contact with moisture, and turns blue when it comes into contact with moisture. The composition of the indicator 10A is such that the main component (component occupying 50% by mass or more of the total mass of the indicator) is a polymerized tall oil rosin, and other components other than the main component are dipropylene glycol dibenzoate, polyethylene glycol glycol compound, Antioxidants, bromocresol green and resazurin.

Spraying amount of the white powder 11 is increased visibility of the indicator 10 after discoloration, in view of vividness and the like of the color, preferably 10 to 300 g / m ^2, more preferably at 50 to 100 g / m ^2.

In the present embodiment, the amount of white powder 11 applied is uniform over the entire area 11a of the continuous strip-shaped white powder 11 shown in FIG. In the present invention, the amount of the white powder 11 applied may be partially different in the indicator corresponding portion 41ab of the core wrap sheet 41, although it is uniform throughout the indicator corresponding portion 41ab of the surface 41a). . For example, in the continuous linear indicator-corresponding portion 41ab extending in the longitudinal direction X of the absorbent core 40 (or the spreading part 11a of the continuous strip-shaped white powder 11), the white color from the one end side in the longitudinal direction X toward the other end side. The spreading amount of the powder 11 may be gradually decreased or increased, or portions having a relatively large amount and relatively small portions may be alternately arranged in the longitudinal direction X. The portion where the amount of the white powder 11 applied is relatively small in the indicator corresponding portion 41ab includes the case where the amount applied is 0 g / m ² . That is, in the present invention, the white powder 11 does not have to be intentionally dispersed in a part of the indicator corresponding portion 41ab of the core wrap sheet 41.

  If the formation material of each part in the diaper 1 is demonstrated, as the surface sheet 2 and the back surface sheet 3, various things conventionally used in the said technical field can be used. As the surface sheet 2, various liquid-permeable sheet materials such as a nonwoven fabric and an apertured film can be used. As the back sheet 3, a liquid-impermeable and moisture-permeable sheet can be used. For example, a resin film having moisture permeability, a water-repellent nonwoven fabric, etc. provided with fine holes penetrating the sheet in the thickness direction. Nonwoven fabrics, laminates of these with other sheets, and the like can be used. Moreover, as the side sheet | seat 62, the thing similar to the back surface sheet 3 can be used.

As the absorbent core 40, for example, a fiber assembly made of hydrophilic fibers such as wood pulp or synthetic fiber, or a fiber assembly in which a particulate water-absorbing polymer is held can be used. The basis weight of the absorbent core 40 is preferably 350 to 500 g / m ² . Moreover, as the core wrap sheet | seat 41 which coat | covers the absorptive core 40, paper, such as tissue paper, various nonwoven fabrics, an apertured film, etc. can be used, for example. The thickness of the core wrap sheet 41 under no load is preferably 0.1 to 0.3 mm, and the basis weight is preferably 10 to 20 g / m ² .

  The diaper 1 of the present embodiment is used in the same manner as a known unfolded disposable diaper. In the diaper 1 of the present embodiment, since the white powder 11 is dispersed on the indicator corresponding portion 4ab on the absorbent core facing surface 41a of the core wrap sheet 41, when the diaper 1 is viewed from the outside when the diaper 1 is worn. Since the color of the indicator 10 that is discolored by the water contained in the excreted liquid in urine or the like becomes clear with good contrast with the white of the white powder 11, the discoloration of the indicator 10 can be easily visually confirmed, and the diaper It is possible to accurately provide a judgment material for the replacement time of one. In particular, when the white powder 11 having a change in the pH of water in contact with the white powder 11 is used, the indicator 10 will change its color more clearly with good responsiveness. Together, the visibility of the indicator 10 is further improved.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention. For example, in the said embodiment, the core wrap sheet | seat 41 is one continuous sheet | seat, this sheet | seat is bend | folded along the absorptive core 40, and the both ends of the longitudinal direction X of the absorptive core 40 are remove | absorbed. The entire surface of the core 40 was covered, but instead of this, two core wrap sheets 41 were used, on the one hand covering the skin facing surface 40a of the absorbent core 40 and on the other hand non-skin facing surface 40b. May be coated. The disposable diaper of the present invention may be a pants-type disposable diaper that is formed in a pants shape in advance, in addition to the unfolded disposable diaper having the fastening tape as in the above embodiment.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

[Example 1]
An unfolded disposable diaper having the same basic configuration as the diaper 1 shown in FIGS. 1 and 2 was produced and used as a sample of Example 1. As the top sheet, a liquid-perforated non-woven fabric having a basis weight of 36 g / m ² composed of a synthetic fiber having a core-sheath structure including polyethylene terephthalate and polyethylene as a core-sheath component is used. A liquid-impermeable and moisture-permeable polyethylene resin film (containing calcium carbonate) of / m ² was used. The absorbent core, as those obtained by holding the particulate water-absorbing polymer in the fiber aggregate, fluff pulp 200 g / m ² and the water-absorbing polymer 186 g / m ² total basis consisting homogeneous mixture of a weight 386 g / m ² An absorbent core was used. As the core wrap sheet, a hydrophilic mount having a thickness of 0.2 mm (basis weight 16 g / m ² ) was used. The absorbent body is coated with a hot melt adhesive on a predetermined portion of one side of the core wrap sheet, and after the white powder is sprayed on the adhesive coating surface in a predetermined spray pattern, an absorbent core is further superimposed, The core wrap sheet was produced by appropriately bending. The total length in the longitudinal direction of the absorber was 360 mm, the total length in the width direction (maximum length) was 110 mm, and the thickness under no load was 5.0 mm. The indicator and the white powder are respectively arranged as shown in FIG. 3, and the amount of white powder sprayed is uniform throughout the continuous strip-shaped spraying part 11a shown in FIG. 3 (uniform throughout the indicator corresponding part 41ab). It was. As the indicator, the indicator 10A mainly composed of polymerized tall oil rosin was used, and talc was used as the white powder.

[Examples 2 to 4]
An unfolded disposable diaper was produced in the same manner as in Example 1 except that the amount of white powder applied was changed as appropriate, and used as samples of Examples 1 to 4.

[Comparative Example 1]
An unfolded disposable diaper was produced in the same manner as in Example 1 except that the white powder was not sprayed, and used as a sample of Comparative Example 1.

[Evaluation]
About each sample (disposable diaper) of an Example and a comparative example, the visibility of the indicator was evaluated in accordance with the following method. The results are shown in Table 1 below.

<Indicator visibility>
A disposable diaper to be measured is expanded in a flat shape as shown in FIG. 1 and fixed on a horizontal surface with the skin facing surface (surface sheet) facing upward, and a cylindrical injection portion on the surface sheet of the indicator arrangement portion An acrylic plate with a mark is put on it, a weight is placed on the acrylic plate, and a load of 5 g / cm ² is applied to the indicator arrangement portion. The injection part provided on the acrylic plate has a cylindrical shape with an inner diameter of 10 mm, and the central axis of the cylindrical injection part coincides with the central axis in the longitudinal direction and the width direction of the acrylic plate, and the cylindrical injection part A through-hole having an inner diameter of 10 mm is formed so as to communicate between the inside and the surface sheet facing surface of the acrylic plate. Next, the acrylic plate is arranged so that the central axis of the cylindrical injection portion coincides with the central portion (center portion of the indicator) in the plan view of the absorber, and 10 g of tap water (pH 7.0) is added to the cylindrical injection portion. Inject from diapers to absorb. When all the tap water is absorbed in the diaper, remove the acrylic plate and the weight immediately, and after 30 minutes from the injection of tap water, use a color difference meter (Nippon Denshoku Industries Co., Ltd., NF333) The b value of the non-skin facing surface is measured. The color of the non-skin facing surface of the indicator arrangement portion before the tap water is injected is yellow, and its b value is 13.5. As the b value becomes smaller, the hue of the part to be measured (indicator arrangement part) becomes more bluish and the blue becomes clearer.

  Further, as an indicator visibility evaluation, in addition to the measurement of the b value by the color difference meter, a visual determination of the hue of the non-skin facing surface of the indicator placement portion was performed. Specifically, the color (blue) of the non-skin facing surface of the indicator placement portion of another sample is based on the shade of the non-skin facing surface of the indicator placement portion of Comparative Example 1 in which the white powder was not sprayed. The sensory evaluation was visually performed to determine whether the image was clearer than the reference. As a result, in all the examples, the color tone of the non-skin facing surface of the indicator arrangement portion was clearer than in Comparative Example 1.

  As is apparent from the results shown in Table 1, the disposable diaper of each example using a white powder (talc) together with an indicator is more water than the disposable diaper of Comparative Example 1 not using a white powder. The b value after 30 minutes from the injection was small, and the blue color of the non-skin facing surface of the indicator placement portion was clearer. From this result, the “technology for spraying white powder corresponding to the indicator on the surface of the core wrap sheet that faces the non-skin facing surface of the absorbent core” proposed in the present invention had urination. It can be seen that this is effective in making it easier to visually recognize the image.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 3a Skin facing surface 4 of back sheet Absorber 10 Indicator 11 White powder 11a White powder spraying part 40 Absorbent core 40b Absorbent core non-skin facing surface 41 Core wrap sheet 41a Absorbent core opposing surface 41ab of core wrap sheet

Claims (4)

An absorbent body and a back sheet disposed on the non-skin facing surface side of the absorbent body are provided, and the absorbent body includes an absorbent core and a core wrap sheet that covers at least the non-skin facing surface of the absorbent core. A disposable diaper composed of
On the skin facing surface of the back sheet, an indicator that is discolored by contact with moisture is disposed in a portion overlapping the absorbent core in a plan view of the disposable diaper,
The disposable diaper in which the spreading | diffusion part of white powder is formed in the opposing surface with the non-skin opposing surface of the said absorptive core in the said core wrap sheet | seat corresponding to the said indicator.   The disposable diaper according to claim 1, wherein the white powder changes the pH of water in contact with the white powder.   The disposable diaper according to claim 1 or 2, wherein the amount of the white powder sprayed is partially different at a portion corresponding to the indicator of the core wrap sheet. The indicator is formed in a continuous linear shape extending in the longitudinal direction of the absorbent core in a plan view, and the white powder spreading portion is arranged in the longitudinal direction so as to overlap the indicator in a plan view. The disposable diaper as described in any one of Claims 1-3 currently formed in the continuous strip shape extended.

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