JP5291236B1 - Disposable diapers - Google Patents

Abstract

Disclosed is a disposable diaper that can improve the texture of the entire disposable diaper while exhibiting the function of an indicator.
A disposable diaper 1 includes an absorbent body, a back sheet disposed on the non-skin contact surface side of the absorbent body, an exterior sheet disposed on the non-skin contact surface side of the back sheet, and a back sheet. And an indicator 65 disposed on the skin contact surface side. The exterior sheet is provided with a first region R1 in which the indicator can be visually recognized from the non-skin contact surface side of the exterior sheet, and a second region R2 in which the indicator is more visible than the first region R1. . At least a part of the first area and at least a part of the second area are arranged so as to overlap the indicator.
[Selection] Figure 5

Description

  The present invention relates to a disposable diaper.

  Conventionally, it has a front waistline region, a rear waistline region, and a crotch region located between the front waistline region and the back waistline region, and a pair of leg opening portions are formed and straddles the inseam region. Disposable diapers having an absorbent body extending toward the region and the rear waistline region are known.

  In Patent Document 1, in such a disposable diaper, in order to inform the wearer of the replacement time of the disposable diaper, a technique of providing a hydrophilic agent that visually changes when in contact with moisture as an indicator in the crotch region Is disclosed. The disposable diaper of patent document 1 has the translucent area | region whose light transmittance is 40% or more, and the indicator is provided in the member inside the sheet | seat of the translucent area | region.

JP 2005-27884 A

  However, the disposable diaper described above has the following problems.

  As for the above-mentioned disposable diaper, the sheet | seat which has a translucent area | region is arrange | positioned in the surface on the non-skin contact side rather than an indicator. Therefore, the indicator is clearly displayed on the outer surface of the disposable diaper, and the indicator is conspicuous. In addition, the indicator is unique to disposable diapers, not underwear. When the indicator stands out, it is clearly indicated that it is a disposable diaper and the functional aspects of the disposable diaper are emphasized.

  In recent years, when selecting a disposable diaper, not only the functional aspect of the disposable diaper but also an increasing number of users are demanding softness such as underwear and texture such as touch. Such users tend to be required to have a disposable diaper having a function of a disposable diaper and having flexibility such as underwear. When the indicator of the disposable diaper is too conspicuous, some users may feel that the functional aspect of the disposable diaper is too emphasized, and the evaluation of the texture of the entire disposable diaper may not be improved.

  Then, this invention is made | formed in view of the above-mentioned subject, and it aims at providing the disposable diaper which can improve the texture of the whole disposable diaper, exhibiting the function of an indicator.

  A disposable diaper according to the present disclosure (disposable diaper 10) has a front waistline region, a back waistline region, and a crotch region positioned between the front waistline region and the back waistline region, and from the front waistline region An absorber having a product longitudinal direction toward the rear waistline and a product width direction orthogonal to the product longitudinal direction, straddling the crotch region and extending to at least one of the front waistline region and the rear waistline region A liquid-impermeable back sheet disposed on the non-skin contact surface side with respect to the absorber, an exterior sheet made of a non-woven fabric disposed on the non-skin contact surface side with respect to the back sheet, and the back A disposable diaper provided on the skin contact surface side of the sheet and configured to visually change when contacted with moisture, wherein the exterior sheet has a non-skin contact Tangent side A first region where the indicator can be visually recognized, and a second region where the indicator is more visible than the first region, and at least a part of the first region and the second region The gist is that at least a part of the indicator overlaps the indicator.

  According to the disposable diaper which concerns on this indication, the disposable diaper which can improve the texture of the whole disposable diaper can be provided, exhibiting the function of an indicator.

It is an expanded top view of the disposable diaper concerning this embodiment. It is sectional drawing of the disposable diaper along the F1-F1 line | wire shown in FIG. It is sectional drawing of the disposable diaper along the F2-F2 line | wire shown in FIG. It is an expansion | deployment rear view of the disposable diaper shown in FIG. It is the figure which expanded the A section shown in FIG. FIG. 6 is a sectional view taken along line F3-F3 shown in FIG.

  Next, an embodiment of the disposable diaper 10 according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings may be contained.

  In the present embodiment, the tape-type disposable diaper 10 is described as an example, but the present invention is also applicable to the pants-type disposable diaper 10.

(1) Overall Schematic Configuration of Disposable Diaper FIG. 1 is a developed plan view of a disposable diaper 10 according to this embodiment. FIG. 2 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in FIG. FIG. 3 is a cross-sectional view of the disposable diaper along the line F2-F2 shown in FIG. FIG. 4 is a developed rear view of the disposable diaper shown in FIG. 1. 1 and 4 show a state in which the elastic members 81 of the leg stretchable part 75 and the leg side gathers 80 are extended until the top sheets 50 and the side flaps 70 constituting the disposable diaper are not formed. FIG.

  The disposable diaper 10 has a front waistline region 20, a crotch region 25, and a rear waistline region 30. The front waistline region 20 is a portion in contact with the wearer's front waistline portion (abdomen portion). Further, the rear waistline region 30 is a portion in contact with the rear waistline portion (back portion) of the wearer. The crotch region 25 is located between the front waistline region 20 and the back waistline region 30.

  Further, the disposable diaper 10 is formed with a pair of leg openings 35. The leg opening 35 is provided at a side end portion in the product width direction of the disposable diaper, and is a portion that is disposed around the leg of the wearer while the disposable diaper is worn by the wearer.

  In the present embodiment, a direction from the front waistline region 20 to the rear waistline region 30 is referred to as a product longitudinal direction L, and a direction orthogonal to the product longitudinal direction L is referred to as a product width direction W.

  The disposable diaper 10 includes an absorbent body 40 that straddles the crotch region 25 and extends from the crotch region 25 toward at least one of the front waistline region 20 and the rear waistline region 30. The absorber 40 includes an absorbent core 40a and a core wrap 40b.

  The absorbent core 40a is the same as a conventional disposable diaper, and can be appropriately configured using a known member or material such as pulverized pulp or a superabsorbent polymer. The absorbent core 40a is wrapped with a sheet-like core wrap 40b.

The core wrap 40b is a sheet that covers the absorbent core 40a. At least a part on the skin surface side of the core wrap 40b is constituted by various fiber nonwoven fabrics or tissue sheets having liquid permeability. For example, air-through nonwoven fabric of weight approximately 10 to 30 g / m ^2, spun bond nonwoven fabric, SMS can be used (spunbond - spunbond - meltblown) nonwoven or tissue sheet mass about 10 to 30 g / m ^2,.

  A liquid-permeable top sheet 50 is provided on the surface side (skin contact surface side) of the absorber 40. A liquid-impermeable back sheet 60a is provided on the back side (non-skin contact surface side) of the absorber 40. On the back side (non-skin contact surface side) of the liquid-impermeable back sheet 60a, an exterior sheet 60 made of a nonwoven fabric is provided. Further, an indicator 65 configured to visually change when contacting with moisture is provided on the skin contact surface side from the back sheet. The configurations of the indicator 65 and the exterior sheet 60 will be described in detail later.

  Side flaps 70 are respectively provided on the side edges of the absorbent body 40 in the product width direction W. The side flap 70 straddles the front waistline region 20, the crotch region 25, and the rear waistline region 30, and is disposed outside the absorbent body 40 in the product width direction. The side flap 70 is comprised by the nonwoven fabric which piled up the 1 sheet or 2 or more sheets. The pair of side flaps 70 are each provided with a fastening tape 90.

  The fastening tape 90 is a pair, and extends in the product width direction W in the rear waistline region 30 and is fastened to the non-skin contact surface of the front waistline region 20 so that the disposable diaper 10 is attached to the wearer. Hold on the body.

  The target portions 95 are a pair and are arranged on the non-skin contact surface in the front waistline region, and are configured such that the pair of fastening tapes 90 are fixed to each other.

  In the present embodiment, the front waistline region 20, the rear waistline region 30, and the fastening tape 90 constitute a waistline holding portion. The waistline holding portion of the rear waistline region 30 is a range extending in the width direction from the region where the engaging member of the fastening tape 90 is provided. The waistline holding portion of the front waistline region 20 is a range extending in the width direction from the region where the target portion 95 is provided.

  Further, the disposable diaper 10 includes a crotch expansion / contraction part 200 disposed in a region overlapping the absorber in the crotch region 25. The configuration of the crotch expansion / contraction unit 200 will be described in detail later.

  The side flap 70 is provided with a pair of leg stretchable parts 75 that are disposed on the inner side in the product width direction than the leg opening 35 and can be stretched in the product longitudinal direction L.

  The leg stretchable part 75 is longer than the crotch stretchable part 200 in the product longitudinal direction L, and is provided outside the crotch stretchable part 200 in the product width direction W.

  The leg expansion / contraction part 75 should just be comprised so that the leg opening part 35 can be expanded-contracted in a product longitudinal direction, may be arrange | positioned along the leg opening part 35, and one part is with respect to the leg opening part 35. And may be arranged in an inclined state.

  The leg stretchable part 75 is made of a stretchable sheet, thread rubber, or the like. The leg stretchable portion 75 is a portion that substantially contracts in the product longitudinal direction, and is a concept that excludes a portion where the stretchable sheet is disposed in a state where the contraction force is not exerted.

  A pair of leg side gathers 80 extending along the product longitudinal direction L are provided inside the pair of leg stretchable portions 75 (near the center in the product width direction W). The leg side gathers 80 are provided at the inner end of the side flap 70 in the product width direction, and are erecting and expanding gathers disposed on the inner side in the product width direction than the leg stretchable parts 75. The leg side gathers 80 are arranged on the inner side in the product width direction than the leg stretchable parts 75. The leg side gathers 80 can adopt a conventionally well-known configuration. Specifically, the leg side gathers 80 may be formed of a sheet material different from the side flaps 70.

  Further, between the pair of fastening tapes in the product width direction, a waist stretchable portion 85 that can be stretched in the product width direction is provided. The waist elastic part 85 contracts between the fastening tapes in the product width direction.

  In the present embodiment, the waist elastic part 85 is constituted by an elastic sheet. The members constituting the waist elastic part 85 are not particularly limited, but it is preferable to use a member that is as thin as possible, has low bending rigidity, and has a small width ratio. By configuring the waist stretchable portion 85 with a material having low bending rigidity, the waist stretchable portion 85 can easily bend along the body, and the waist stretchable portion 85 can be moved along the body without applying a load to the wearer's body. Can be fitted. In addition, by configuring the waist stretchable portion 85 with a material having a small width, the shrinkage of the disposable diaper in the product longitudinal direction when the disposable diaper extends in the product width direction is suppressed, and the disposable diaper is placed around the waist of the wearer. Can be prevented from being pulled down to the crotch side.

In the present embodiment, a stretchable film having a basis weight of 20 to 45 g / m ² is used as the waist stretchable portion 85.

  The waist stretchable portion 85 is stretched by 1.2 to 2.5 times the length in the non-stretched state (natural state), and then adhered to the exterior sheet 60 by a hot melt adhesive or heat treatment.

  In the present embodiment, the waist elastic part 85 is disposed between the exterior sheet 60 and the back sheet 60a. However, in the configuration in which the core wrap 40b extends outward in the product longitudinal direction from the absorbent core 40a, the waist stretchable portion 85 is disposed between the core wrap 40b and the back sheet 60a or the exterior sheet 60. It may be. The position of the waist elastic part is not particularly limited. Further, in a region where the absorbent body is not disposed, it may be disposed between the side flap 70 and the back sheet 60a or the exterior sheet 60.

  In addition, although the waist stretchable part according to the present embodiment is configured to stretch in the product width direction, the waist stretchable part may be configured to stretch in the product width direction and the product longitudinal direction. .

  The fastening tape 90 is attached to the region of the side flap 70 corresponding to the rear waistline region 30. The fastening tape 90 is provided with a base sheet 91 connected to the side flap 70, an engagement hook (not shown) as a plurality of engagement members, and a hook sheet 92 fixed to the base sheet 91; Is provided. The hook sheet 92 is an area where an engagement member is provided, and the above-described waistline holding portion is an area extending from the hook sheet 92 in the product width direction.

  The hook sheet 92 is fixed to the base sheet 91, specifically, joined. The hook sheet 92 and the base sheet 91 are preferably joined so that the rigidity of the fastening tape 90 does not become higher than necessary. Specifically, it is preferable that the hook sheet 92 and the base sheet 91 are joined by a hot melt adhesive applied intermittently such as a dot shape, a line shape, or a spiral shape. The hook sheet 92 and the base sheet 91 may be joined by heat sealing or the like.

The base sheet 91 is composed of one or two or more non-woven fabrics stacked. As the base material sheet 91, a nonwoven fabric produced by a production method such as spunbond (SB) or spunbond-meltblown-spunbond (SMS) can be used. The basis weight of the nonwoven fabric constituting the base sheet 91 (total basis weight in the case of a plurality of sheets) is 30 to 120 g / m ² , preferably 40 to 90 g / m ² .

(2) Configuration of Crotch Stretchable Part Next, the shape of the crotch stretchable part 200 will be described.

  The crotch stretchable part 200 is configured to maintain a flat shape in a part of the crotch region 25 when the disposable diaper 10 is attached to the wearer, rather than the other parts of the absorber 40.

  Here, the crotch stretchable portion 200 may be stretchable in the product longitudinal direction L, may be stretchable in the product width direction W, and is stretchable in both the product longitudinal direction L and the product width direction W. It may be possible.

  For example, the crotch stretchable part 200 is provided separately from the leg stretchable part 75 and overlaps the absorbent core 40a (in this embodiment, the core wrap 40b that wraps the absorbent core 40a and the backsheet 60a In the middle position), 60% or more of the length (natural state) of the absorbent core 40a in the product width direction W at the position is contracted.

  In this way, by shrinking the portion where the absorbent core 40a is disposed by the crotch stretchable portion 200, the absorbent core 40a shrinks, and it is easy to maintain a flat shape compared to the portion where the absorbent core 40a does not shrink. Become.

  On the other hand, the absorbent core 40 a located in the front waistline region 20 and the rear waistline region 30 located outside the product longitudinal direction L from the crotch stretchable portion 200 is not contracted by the crotch stretchable portion 200.

  Therefore, the crotch stretchable part 200 maintained in a flat shape in the crotch region 25 of the disposable diaper 10 in a state of being held around the waist and waist of the wearer by the fastening tape 90 without excessively adhering to the body, As a result, the crotch stretchable part 200 is appropriately disposed along the body.

  In addition, when the crotch stretchable part 200 is stretchable along the product longitudinal direction L, the front waistline area 20 and the back waistline area 30 are likely to rise due to the shrinkage of the crotch stretchable part 200. A flat crotch region can be formed along the body at the part.

  As a result, since the front waistline region 20 and the back waistline region 30 rise from the crotch stretchable part 200, the fit of the disposable diaper 10 to the wearer is improved.

  That is, the disposable diaper 10 can be stably mounted so that the crotch region 25 of the disposable diaper 10 is disposed in the crotch part of the wearer by the contraction of the crotch stretchable part 200.

  Further, as described above, the crotch stretchable part 200 is configured to be stretchable, so that a part of the crotch region 25 of the disposable diaper 10 is contracted and the clothing side of the disposable diaper 10 (non-skin contact) Irregular wrinkles are formed on the surface on the contact surface side. As a result, it is possible to remind the wear assistant that the crotch portion is clearly present in the disposable diaper 10 according to the present embodiment visually and tactilely.

  Note that the crotch stretchable portion 200 may be configured by a stretchable sheet. By configuring the crotch stretchable portion 200 with the stretchable sheet, the absorbent core 40a in the region where the stretchable sheet is disposed is uniformly shrunk, and it becomes easier to maintain a flat shape. The stretchable sheet can be constituted by a stretchable sheet similar to the leg stretchable part 75, for example.

  For example, the stretchable sheet may be a stretchable film formed by melting a thermoplastic elastomer resin such as urethane or styrene, a stretchable nonwoven fabric made of stretchable fibers, a stretchable film or a stretchable nonwoven fabric. A composite sheet or the like obtained by laminating a non-stretchable sheet that has been cut or weakened can be used.

  Further, instead of the stretchable sheet, the crotch stretchable portion 200 may be configured by arranging elastic members in the form of threads or bands made of polyurethane elastic fiber or natural rubber in parallel with each other.

  In such a case, considering the rigidity of the absorbent core 40a and the rigidity of other members constituting the disposable diaper 10, the thickness of the elastic member to be used and the pitch to be arranged can be appropriately selected. It is preferable that the entire side edge portion in the product width direction W of the absorbent core 40a is contracted when the stretched state is set.

  Further, in order to uniformly shrink the absorbent core 40a by the crotch expansion / contraction part 200, the interval between the elastic members is preferably 7 mm or less, and more preferably 5 mm or less. Moreover, in order to shrink the absorptive core 40a uniformly, it is desirable to make the difference of the space | interval of an adjacent elastic member into 2 mm or less.

  Specifically, the expansion / contraction rate of the crotch expansion / contraction part 200 is preferably 1.1 times or more and 1.5 times or less. For example, in this embodiment, the expansion / contraction rate of the crotch expansion / contraction part 200 is set to 1.25 times.

  The expansion / contraction rate means the degree of expansion / contraction of the crotch expansion / contraction part 200 in the contraction direction (the product longitudinal direction L in the present embodiment), and is defined as follows.

Expansion rate = (length in the shrinking direction of the crotch stretchable part 200 in the maximum stretched state) / (length in the shrinking direction of the crotch stretchable part 200 in the natural state)
In addition, in this specification, this expansion / contraction rate shall be measured as follows, for example.

  First, when the disposable diaper 10 is sealed in a package or the like, the disposable diaper 10 is taken out of the package, and in that state, the atmosphere is 20 ° C. ± 2 ° C. and the relative humidity is 60% ± 5% RH. Leave for a minute and measure the length of the crotch expansion / contraction part 200 along the contraction direction. This length is defined as “the length of the crotch expansion / contraction portion 200 in the natural state”.

  Second, the length in the contraction direction of the desired region in such a state (that is, the natural state), and the length in the contraction direction of the desired region when stretched from the natural state to a state where wrinkles by the elastic member cannot be visually confirmed. Measure the thickness. This length is defined as “the length of the crotch expansion / contraction portion 200 in the extended state”.

  Using these measurement results, the elongation percentage is measured by calculating with the above formula.

  Thus, by setting the expansion / contraction rate of the crotch expansion / contraction part 200 to 1.1 times or more and 1.5 times or less, it is possible to suitably follow the expansion and contraction of the wearer's skin.

  For example, when the wearer takes a forward bending posture such that the front side of the body contracts, there is a portion that extends about 30% in the skin on the buttocks side of the wearer relative to the stretched state.

  That is, when the expansion ratio of the crotch expansion / contraction part 200 is 1.1 times or less, the crotch expansion / contraction part 200 is not sufficiently contracted in the natural state, and compared to the case where the crotch expansion / contraction part 200 is not provided, the disposable diaper 10 The shrinkage of the absorbent body arrangement region in the crotch region 25 is small, and it becomes insufficient for the crotch region 25 of the disposable diaper 10 to take a flat shape along the body in the crotch part of the wearer, so that the disposable diaper 10 becomes easy to shift from the wearer's body.

  On the other hand, if the expansion / contraction ratio of the crotch expansion / contraction part 200 is larger than 1.5 times, the contraction dimension in the contraction direction of the crotch expansion / contraction part 200 becomes too large. The disposable diaper 10 is likely to be in close contact with the wearer, and easily displaces below the wearer.

  Moreover, the shrinkage | contraction amount in the product longitudinal direction L of the crotch expansion-contraction part 200 may be comprised so that it may become 2 to 8% of the length in the product longitudinal direction L of the disposable diaper 10. FIG.

  Note that the amount of shrinkage is the length “b (mm)” in a stretched state so that the wrinkles are sufficiently small and the surface of the sample is nearly smooth, and the natural state in the direction along the shrinkage direction of the sample. It is the difference from the length “a (mm)” and can be calculated by (b−a).

  The present inventor assumes that the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is 2 to 8% of the length of the disposable diaper 10 in the product longitudinal direction L, and the process of attaching the disposable diaper 10 to the wearer. In the above, it was confirmed that the crotch stretchable part 200 is preferably easily along the wearer's body.

  Here, when the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is larger than 8%, the crotch stretchable part 200 is contracted too much, and the disposable diaper 10 is not sufficiently short in the product longitudinal direction L. It becomes difficult to attach the diaper 10 to the wearer's body, or the disposable diaper 10 and the wearer's body are in close contact with each other in the crotch region 25 and are likely to be displaced.

  On the other hand, if the amount of shrinkage of the crotch stretchable part 200 in the product longitudinal direction L is 2% or less, the effect itself of the crotch stretchable part 200 that brings the disposable diaper 10 closer to the wearer's body becomes difficult to manifest.

  Further, the center O2 of the crotch stretchable part 200 in the product longitudinal direction L is arranged on the front waistline region 20 side with respect to the center O1 of the disposable diaper 10 in the product longitudinal direction L. Moreover, the crotch expansion / contraction part 200 is arrange | positioned so that the center O1 of the disposable diaper 10 in the product longitudinal direction L may be straddled.

  The crotch expansion / contraction part 200 is formed at a position including the center O1 of the disposable diaper 10 in the product longitudinal direction L.

  Further, the length (natural state) of the rear waistline region 30 in the product longitudinal direction L is configured to be longer than the length (natural state) of the front waistline region 20 in the product longitudinal direction L.

  Specifically, the ratio of the length of the rear waistline region 30 in the product longitudinal direction L (natural state) to the length of the front waistline region 20 in the product longitudinal direction L (natural state) is 1.1 or more and 1.6. It is preferable to be configured as follows, and more preferable to be configured to be 1.2 or more and 1.5 or less.

  If this ratio exceeds 1.6, the balance between the ventral side and the back side of the disposable diaper 10 is lost, and when the crotch stretchable part 200 is placed along the crotch region 25, the front waistline region 20 is excessively adhered. The rear waistline region 30 is covered more than necessary.

  Specifically, since the wearer's body is generally in a state in which the buttock protrudes more than the lower abdomen, after combining the crotch stretchable part 200 and the crotch part of the wearer, By setting the ratio within the above-described range, the disposable diaper 10 has a more suitable shape with respect to the complicated shape of the wearer's body.

  That is, it is possible to prevent partial stretching of the disposable diaper 10 due to the occurrence of a portion with insufficient dimensions and unnecessary gaps between the disposable diaper 10 and the body due to occurrence of portions with excessive dimensions.

  In particular, in the case of an infant used before starting walking or when walking is started, it is preferable that the body takes a posture that is curled toward the abdomen. In such a posture, the skin on the buttocks side is stretched. By setting the above-mentioned ratio to the above-mentioned range, it becomes a state suitable for an infant's body that easily takes such a posture.

  As an example, for the product length 400 mm of the disposable diaper 10 (the length of the natural state in the product longitudinal direction L), the front waistline region 20 is set to 130 mm (the length of the natural state in the product longitudinal direction L), The crotch expansion / contraction part is set to 80 mm (length in the natural state in the product longitudinal direction L), and the rear waistline region 30 is set to 100 mm (length in the natural state in the product longitudinal direction L).

  In this case, the ratio of the length (natural state) between the front waistline region 20 and the back waistline region 30 is about 1.46. By setting it as such a ratio, not only the crotch expansion-contraction part 200 but the product longitudinal direction L whole of the disposable diaper 10 can be made to follow a wearer's body further.

  That is, according to such a configuration, the position of the crotch expansion / contraction part 200 in the front-rear direction is determined, so that the disposable diaper 10 can be correctly fitted to the wearer's body and the design of the disposable diaper 10 can be interlocked. Aim can be realized more reliably.

  Since the crotch stretchable part 200 is in a contracted state, the crotch stretchable part 200 is disposable to the wearer because the crotch stretchable part 200 is different from the non-contracted state in the absorber placement region on the front waistline region 20 side and the back waistline region 30 side. When the diaper 10 is worn, it becomes easy to attach the crotch stretchable part 200 to the wearer's crotch.

  Further, according to such an arrangement, in a state where the part of the absorbent core 40a provided with the crotch stretchable part 200 is contracted, the rigidity or thickness of the part is equal to the rigidity or thickness of the part of the other absorbent core 40a. Since it becomes different, it becomes easy for a wear assistant to recognize the site | part matched with a wearer's crotch part in the crotch region 25 of the disposable diaper 10. FIG.

  Furthermore, after the disposable diaper 10 is mounted, the crotch stretchable part 200 maintains a flat shape at the wearer's crotch, and the disposable diaper 10 itself becomes a three-dimensional shape, so that the inseam area of the disposable diaper 10 Since 25 can be placed along the crotch of the wearer, it is more certain that the crotch region 25 of the disposable diaper 10 and the crotch of the wearer are matched and worn.

  As shown in FIG. 1, a notch 110 and a notch 120 are formed in the crotch region 25 of the absorber 40. The notch 110 and the notch 120 are regions where the absorbent core 40a constituting the absorber 40 is not present.

  In the present embodiment, the notch 110 and the notch 120 correspond to a low-rigidity part in which the basis weight of the absorbent core 40a is lower than that of the other absorbent cores 40a.

  Instead of forming the notch portion 110 and the notch portion 120, the basis weight of the absorbent core 40a may be lower than that of the other absorbent core 40a.

  As shown in FIG. 1, the notch 110 and the notch 120 are formed along the edge of the crotch stretchable part 200 in the product longitudinal direction L.

  Even when the notch 110 and the notch 120 are formed, the absorbent core 40a located in the front waistline region 20 and the rear waistline region 30 and the absorbent core 40a located in the crotch region 25 It is preferably continuous without being completely separated, and particularly preferably continuous in the product width direction W.

  The cutout portion 110 and the cutout portion 120 are configured such that the length (natural state) in the product longitudinal direction L becomes longer as going outward in the product width direction W.

  With such a shape, the outer side of the absorbent core 40a in the product width direction W is more easily contracted, so that a flat “bottom” can be formed in the disposable diaper 10.

  Also, the absorbent core 40a located on the front waistline region 20 side from the notch 110 and the absorbent core 40a located on the back waistline region 30 side from the notch 120 rise from the flat `` bottom part '' and Since it becomes easy to curve along the roundness of the body (abdomen and buttocks), the shape of the disposable diaper 10 itself can be closer to the shape of the wearer's body.

  As shown in FIG. 1, the edge of the notch 110 on the front waistline region 20 side and the edge of the notch 120 on the back waistline region 30 side may be arcuate.

  Specifically, the front waistline 20 side edge of the notch 110 is shaped so that the center of the arc is located on the back waistline 30 side of the edge, and the rear waistline of the notch 120 The edge on the 30th side has a shape such that the center of the arc is located closer to the front waistline region 20 than the edge.

  With such a shape, deformation along the roundness of the wearer's body of the disposable diaper 1 is easier and more likely to occur.

  The edge of the notch portion 110 on the front waistline region 20 side in the product longitudinal direction L constitutes a first inflection portion 115, and the edge of the notch portion 120 on the rear waistline region 30 side of the product longitudinal direction L is the second The inflection part 125 is configured.

  In addition, the 1st inflection part 115 and the 2nd inflection part 125 are extended along the product width direction W, and are comprised so that it may become a bending origin of the disposable diaper 10. FIG.

  As shown in FIG.1 and FIG.2, in the disposable diaper 10 which concerns on this embodiment, the crotch expansion-contraction part 200 may be left-right symmetric across the center line O of the product width direction W in a natural state, The difference between the left and right widths of the crotch stretchable part 200 may be within 10% with the center line O in the product width direction W as a boundary.

  According to the disposable diaper 10 according to the present embodiment, the crotch stretchable part 200 can be put on the wearer's crotch part across the center of the wearer's body.

  In the disposable diaper 10 according to the present embodiment, the crotch expansion / contraction part 200 is provided apart from the above-described waistline holding part and the elastic member 71.

  Furthermore, in the disposable diaper 10 according to this embodiment, non-stretchable regions are provided on the front waistline region 20 side and the back waistline region 30 side of the crotch stretchable part 200 in the product longitudinal direction L.

  Moreover, in the disposable diaper 10 which concerns on this embodiment, as shown in FIG.1 and FIG.2, the length of the product width direction W of the absorptive core 40a becomes short toward the crotch area 25 from the front waistline area 20, The rear waistline region 30 is configured to become shorter toward the crotch region 25.

  Here, the crotch stretchable portion 200 is provided in a region where the length of the absorbent core 40a in the product width direction W is shorter than a predetermined length.

  In the region where the length of the absorbent core 40a in the product width direction W is shorter than the predetermined length, the absorbent 40 has a small absorption capacity, so that the excrement fluid of the wearer is absorbed by the absorber 40 in this region. Therefore, it is likely to be absorbed by the absorber 40 on the front waistline region 20 side and the back waistline region 30 side in the product longitudinal direction L of such a region.

As a result, the discoloration of the indicator 65 easily propagates from the region to the front waistline region 20 side and the rear waistline region 30 side.
Generally, in the area where the crotch expansion / contraction part 200 is provided, wrinkles due to the crotch expansion / contraction part 200 occur, so that the wear assistant has different discoloration of the indicator 65 between the area and the non-extension / contraction area. Looks.

  Considering the above points, according to the above-described configuration, the wear assistant does not replace the disposable diaper 10 in the discoloration of the indicator 65 in the region, and the front waistline region 20 side in the product longitudinal direction L of the region and Discoloration of the indicator 65 in the non-stretchable region on the rear waistline region 30 side can also be used as a guide for replacing the disposable diaper 10.

  As a result, it is possible to notify an appropriate replacement timing of the disposable diaper 10 while suppressing excessive replacement of the disposable diaper 10.

(3) Configuration of Indicator The disposable diaper 10 according to the present embodiment is provided with an indicator 65. The indicator 65 extends in the product longitudinal direction L across the crotch stretchable part 200, and is made of a color change agent that visually changes when it comes into contact with moisture.

  According to such a configuration, when the crotch expansion / contraction part 200 is attached along the wearer's body (crotch), the indicator 65 can stably exist at a position close to the wearer's excretion opening. become.

  As a result, it is possible to avoid a situation in which the indicator 65 is biased and discolored or a situation in which the indicator 65 is discolored only on the wearer's back side.

  Furthermore, since the wearer's excretion opening and the crotch expansion / contraction part 200 are close when worn, the first indicator 65 can be stably discolored in the crotch region 25 of the disposable diaper 10.

  As shown in FIG. 4, a plurality of such indicators 65 may be configured to extend in parallel with a virtual line extending in the product longitudinal direction through the center line in the product width direction W.

  Further, when the crotch stretchable part 200 is formed of a liquid-impermeable stretchable sheet, the indicator 65 is disposed on the skin contact surface side of the stretchable sheet. On the other hand, when the crotch stretchable portion 200 is formed of a liquid-permeable stretchable sheet, the indicator 65 is disposed on the non-skin contact surface side of the crotch stretchable portion 200.

  Note that the change (discoloration) of the indicator 65 described above is visible from the non-skin contact surface side of the disposable diaper 10. For example, when the indicator 65 is disposed on the skin contact surface side of the stretchable sheet, the light transmittance of the stretchable sheet is preferably 60% or more and 87% or less. According to such a configuration, the change (discoloration) of the indicator 65 can be visually recognized from the non-skin contact surface side of the disposable diaper 10.

  The width of the crotch stretch part 200 in the product width direction W is ½ or more of the width of the absorbent core 40a in the product width direction W in the region where the crotch stretch part of the absorbent core 40a exists.

  Accordingly, the crotch expansion / contraction part 200 contracts a certain width or more of the portion where the absorbent core 40a is disposed, so that the absorbent core 40a contracts and the absorbent core 40a is lifted so as to approach the wearer's body.

  The gap between the disposable diaper 10 and the wearer can be reduced by realizing such a raised crotch region of the absorbent core 40a. When the width of the crotch stretchable part 200 in the product width direction W is 60% or more of the width of the absorbent body 40 (absorbent core 40a) in the product width direction W, more preferably 80% or more, disposable diapers The gap between 10 and the wearer can be further reduced.

  Furthermore, if the width of the crotch stretchable part 200 is too narrow compared to the width of the absorbent core 40a, it is difficult to obtain the effect of lifting the absorbent core 40a described above. On the other hand, when the width of the crotch stretchable part 200 is too wide compared to the width of the absorbent core 40a, the portion where the absorbent core 40a is not disposed is contracted more than the portion where the absorbent core 40a is disposed. The disposable diaper 10 is attached. As a result, the members constituting the portion where the absorbent core 40a is not disposed overlap each other, the crotch stretchable portion 200 becomes hard, and the comfort of the disposable diaper 10 is impaired.

  For example, in the region where the crotch expansion / contraction part of the absorbent core 40a is present, the width of the crotch expansion / contraction part 200 is preferably 60 to 110 mm when the dimension of the narrowest part (in the extended state) is 120 mm. . More preferably, the width of the crotch expansion / contraction part 200 is 90 to 110 mm.

  The part where the width of the absorbent core 40a is the narrowest in the product width direction W is preferably provided on the front side of the product longitudinal direction by 10 to 60 mm. Preferably, the part where the width of the absorbent core 40a is the narrowest in the product width direction W is provided on the front side of the product longitudinal direction by 20 to 40 mm. It is preferable that the crotch stretchable part 200 is formed so as to straddle a portion where the width of the absorbent core 40a is the narrowest in the product width direction W.

  The position where the left and right thighs of the wearer are closest to each other is in front of the center of the wearer's body in the front-rear direction. Therefore, the portion where the width of the absorbent core 40a is the narrowest in the product width direction W can be positively arranged at the position where the left and right thighs of the wearer are closest to each other by the contraction force of the crotch stretchable portion 200. . In other words, even if a wear assistant such as a mother does not align the absorbent core 40a, the absorbent core 40a is naturally aligned.

  The indicator 65 is configured to extend beyond the crotch stretchable part 200 in the product longitudinal direction L from the region where the absorbent core 40a and the crotch stretchable part 200 overlap.

  According to such a configuration, the absorbent core 40a and the indicator 65 are lifted along the wearer's body by the crotch stretchable part 200, and the disposable diaper 10 can be stably attached in a state along the wearer's body. .

  In addition, the color difference of L * a * b * color system L * between the overlapping area that overlaps the indicator of the exterior sheet 60 and the area around the overlapping area of the exterior sheet 60 is greater than that before the indicator changes color. The state after the color change is configured to be higher.

  According to such a configuration, the indicator after the color change can be made more conspicuous, and the replacement time can be easily notified by the indicator. Further, for example, by making the indicator in a state before the color change inconspicuous, the visibility of the indicator can be lowered in a state before the body fluid is discharged. The display of the functional surface of the disposable diaper can be suppressed and the texture like underwear can be expressed.

  Specifically, the color of the area around the overlapping area of the exterior sheet 60 is the color of the exterior sheet 60 itself, and generally white. The white L value is 100. In the disposable diaper having such an exterior sheet 60, the overlapping region before the color change can be yellow (L value: 95), and the overlapping region after the color change can be blue (L value: 70). According to such a structure, it can comprise so that the indicator after discoloration may be made conspicuous, while configuring so that the indicator before discoloration may not be conspicuous.

  The light transmittance was measured in accordance with the standard of JIS-K7105, and a color difference meter (Nippon Denshoku Industries Co., Ltd. Kyoko photometric color difference meter Z-300A) was used. Specifically, a sample having a width of 5 mm and a length of 5 mm is sandwiched between turbidimeters to obtain a TT value, and the obtained TT value can be obtained as a total light transmittance (%).

(4) Structure of exterior sheet | seat Then, the exterior sheet | seat 60 is demonstrated in detail based on FIG.5 and FIG.6. 5 is a schematic rear view enlarging the portion A shown in FIG. 4, and FIG. 6 is a cross-sectional view taken along line F3-F3 shown in FIG.

  The exterior sheet is formed with a concavo-convex shape (皺) by embossing. More specifically, the exterior sheet 60 is formed with a convex portion 61 and a concave portion 62. The concave portion 62 is a portion compressed in the thickness direction by embossing, and is a portion where the thickness of the exterior sheet is thinner than the convex portion 61. The convex portion 61 is a portion that is thinner than the concave portion 62 and is a portion that is not squeezed by embossing or a portion that is less compressed than the concave portion 62.

The exterior sheet 60 is made of a nonwoven fabric having a basis weight of 10 to 40 g / m ² . This embodiment, spunbond nonwoven fabric having a basis weight of 25 g / m ^2. If the basis weight of the nonwoven fabric is larger than 40 g / m ² , it is difficult to ensure the flexibility of the exterior sheet 60 while suppressing the fluff of the exterior sheet, and fluff is likely to occur. On the other hand, if the basis weight of the nonwoven fabric is less than 10 g / m ² , it may be difficult to form irregularities when embossing is performed.

  In the exterior sheet 60 of the present embodiment, the convex portions 61 and the concave portions 62 are formed by embossing a sheet material having a substantially uniform basis weight of fibers constituting the nonwoven fabric. Therefore, the fiber density of the convex portion 61 is lower than the fiber density of the concave portion 62.

  The region where the convex portion 61 of the exterior sheet 60 is formed constitutes a first region R1 where the indicator can be visually recognized from the non-skin contact surface side of the exterior sheet 60, and the region where the concave portion 62 of the exterior sheet 60 is formed is The second region R2 having higher indicator visibility than the first region R1 is formed. That is, the exterior sheet 60 is formed with two regions with different visibility of the indicator. At least a part of the first region R1 and at least a part of the second region R2 are arranged so as to overlap the indicator.

  Thus, since 1st area | region R1 and 2nd area | region R2 from which the visibility of an indicator differs are formed in the exterior sheet | seat 60, when a wear assistant etc. visually recognize a disposable diaper from the outside, the indicator whole surface is the same aspect. It is not visually recognized by and is partially visible. For example, if the entire indicator looks the same, the functional aspect of the disposable diaper is emphasized, and the design may be deteriorated, or the viewer may not feel the texture such as the touch.

  However, by providing the second region R2 with high visibility of the indicator and the first portion with low visibility of the indicator, for example, the indicator can be shown in a striped pattern or in stages. Therefore, it is possible to suppress deterioration in texture due to the indicator being too conspicuous.

  The first region R1 and the second region R2 may be configured so that at least the visibility of the indicator is different, and the first region R1 may be configured such that the color change mode by the indicator is difficult to grasp. For example, even if the first region R1 is configured so that it is difficult to grasp the color change mode by the indicator, the wear assistant can grasp the color change mode of the indicator through the second region R2 and replace it. You can grasp the time.

  Moreover, the visibility of 1st area | region R1 and the visibility of 2nd area | region R2 may differ by exhibiting the color which can distinguish 1st area | region R1 and 2nd area | region R2. Specifically, for example, when the density and bulk of the fibers constituting the exterior sheet are different, the colors of the fibers constituting the exterior sheet are different, and the first region R1 and the second region R2 are distinguished from each other. Further, the density and bulk of the fibers constituting the exterior sheet are different, so that the color seen through the exterior sheet is different, and the first region R1 and the second region R2 can be distinguished.

  The configuration in which at least a part of the first region R1 and the indicator are arranged and the configuration in which at least a part of the second region R2 and the indicator are arranged are referred to as the first region R1 and the first region. This is a concept that includes not only a configuration in which the exterior sheet 60 provided with the two regions R2 and the indicator directly overlap but also a configuration in which the exterior sheet 60 overlaps via the backsheet 60a as in the present embodiment. In other words, the positional relationship overlaps in the plan view shown in FIGS.

  The light transmittance of the exterior sheet 60 is preferably 60% or more and 90% or less. According to this configuration, the change (discoloration) of the indicator 65 can be visually recognized from the non-skin contact surface side of the disposable diaper 10. The light transmittance of the exterior sheet 60 of the present embodiment is 77%.

  The first region R1 of the exterior sheet 60 is a convex portion 61 formed by embossing, and the second region R2 of the exterior sheet 60 is a concave portion 62 formed by embossing. The recess 62 is formed into a film by press-bonding fibers by embossing. For this reason, the light transmittance is higher than before embossing. On the other hand, the convex portion 61 is a portion that is not embossed, is bulky, and has a lower light transmittance than the concave portion 62.

  Thus, by forming the concave portion 62 and the convex portion 61 by embossing, the concave portion 62 whose distance in the thickness direction is close to the indicator and the convex portion 61 whose distance in the thickness direction is far from the indicator can be easily formed.

  In addition, by forming the concave portion 62 and the convex portion 61 by embossing on the exterior sheet 60 that constitutes the outer surface of the disposable diaper, the touch of the outer surface of the disposable diaper can be improved.

  The dimensional difference in the thickness direction between the convex portion 61 and the concave portion 62 of the exterior sheet is desirably 0.55 mm or more. When the dimensional difference in the thickness direction of the convex portion 61 and the concave portion 62 of the exterior sheet is 0.55 mm or more, the visibility of the indicator due to the convex portion and the concave portion is likely to be different, and the entire disposable diaper is performing while exhibiting the function of the indicator. The texture can be improved effectively.

  In addition, the dimensional difference in the thickness direction of the convex part 61 and the recessed part 62 can be measured with the following method, for example. When the exterior sheet is joined to the disposable diaper, the exterior sheet is peeled off by cold spray (for example, MIKASA MG-3003). Subsequently, the area | region containing the recessed part and convex part used as the measurement site | part of an exterior sheet | seat is cut out using the cutter knife spare blade HA-100 made from KOKUYO, for example. Using a microscope (Keyence VHX-100), observe the cross section in the longitudinal direction of the product, measure the thickness of the convex portion and the concave portion, respectively, and calculate the difference in thickness between the convex portion and the concave portion. The number of samples is 5, and the average of the difference is defined as the dimensional difference in the thickness direction of the convex portion 61 and the concave portion 62.

  On the skin contact surface side of the back sheet 60a, a crotch expansion / contraction part 200 is provided as an expansion / contraction part that expands and contracts in at least one of the product longitudinal direction and the product width direction. At least a part of the crotch stretchable part 200 is arranged so as to overlap the indicator.

  When the crotch expansion / contraction part 200 expands and contracts in the product longitudinal direction, the indicator, the back sheet 60a, and the exterior sheet 60 also contract in the product longitudinal direction. At this time, the concave portion 62 of the exterior sheet 60 is difficult to contract because the fibers are dense, and the convex portion 61 of the exterior sheet 60 is likely to contract because the fibers are sparse. Therefore, in the exterior sheet 60 that overlaps the crotch stretchable part, the difference between the dimension in the thickness direction of the convex part 61 and the dimension in the thickness direction of the concave part 62 becomes more prominent. As the difference in the dimension in the thickness direction between the convex portion 61 and the concave portion 62 of the exterior sheet 60 increases, the difference in the visibility of the first region R1 and the visibility of the second region R2 becomes significant.

  Further, since the convex portion 61 is deformed so as to be lifted from the back sheet 60a side (indicator side) when contracted by the crotch expansion / contraction portion, the convex portion 61 becomes thick and the fibers constituting the convex portion 61 are irregularly reflected. Therefore, the visibility of the indicator in the first region R1 further decreases.

  The back sheet 60a and the exterior sheet 60 are joined to each other via an adhesive applied intermittently to the back sheet 60a or the exterior sheet 60. In the present embodiment, an adhesive is applied by curtain coating over the entire surface where the back sheet 60a and the exterior sheet 60 are in contact, and the back sheet 60a and the exterior sheet 60 are joined via this adhesive. Yes.

  For example, when the exterior sheet 60 and the back sheet 60a are joined via an adhesive applied to the entire surface by direct coating, the exterior sheet 60 and the back sheet 60a are integrally deformed, The sheet 60 and the back sheet 60a are not easily deformed flexibly. Therefore, even when the crotch expansion / contraction part or the like contracts, the exterior sheet 60 may hardly contract due to the contraction of the crotch expansion / contraction part. In addition, the texture may be lost and it may not look like underwear. In view of such a problem, the adhesion area ratio between the exterior sheet 60 and the back sheet 60a is preferably 20% or less.

  Since the backsheet 60a or the exterior sheet 60 is bonded to each other via an adhesive applied intermittently, the exterior sheet 60 and a portion where the backsheet 60a is joined and a portion where the backsheet 60a is not joined are provided. Therefore, while suppressing the positional shift by the portion where the exterior sheet 60 and the back sheet 60a are joined, the portion where the exterior sheet 60 and the back sheet 60a are not joined is flexibly deformed by contraction of the crotch expansion and contraction portion, and the exterior sheet The visibility of the 60 convex portions 61 and the concave portions 62 can be made different.

  When the adhesion area ratio between the exterior sheet 60 and the back sheet 60a is 3% or less, the adhesion points are too few, and the float between the exterior sheet 60 and the back sheet 60a may occur excessively when contracted. Even in the first region having relatively high visibility, floating may occur due to the inability to have a plurality of joint points, and visibility may be reduced. Therefore, the difference in visibility may be a contraction pattern due to adhesion points instead of the arrangement pattern of the convex portions 61 and the concave portions 62. Therefore, the adhesion area ratio is desirably higher than 3%.

  The dimension of the first region R1 in the product longitudinal direction, which is the contraction direction of the expansion / contraction part, is 3.0 mm or more and 15.0 mm or less, and the dimension of the first region R1 in the product width direction that is orthogonal to the contraction direction is 2.0 mm or more and 13.6 mm or less. The ratio of the size of the first region R1 in the product longitudinal direction to the size of the first region R1 in the product width direction is 1.1 to 1.5.

  When the dimension of the first region R1 is less than 2.0 mm, it is difficult to understand the difference in visibility between the concave portion and the convex portion, which is not preferable. Moreover, when the dimension of 1st area | region R1 is larger than 15.0 mm, since the indicator itself may become difficult to see, and it may become easy to generate | occur | produce fluffing and the cloth-like feeling like underwear may be impaired, it is not preferable. .

  Since the length of the first region R1 in the shrinking direction of the crotch stretchable portion is longer than the length of the first region R1 in the orthogonal direction, when the exterior sheet 60 is shrunk due to the shrinkage of the crotch stretchable portion 200, The dimension of 1 area | region R1 and the dimension of 1st area | region R1 in an orthogonal direction can be closely approached.

  For example, if the ratio of the size of the first region R1 in the contraction direction to the size of the first region R1 in the orthogonal direction is higher than 1.5 times, the first region R1 in the contraction direction even when the exterior sheet 60 is contracted. Therefore, the dimension of the convex portion 61 becomes a sharp shape in plan view. Therefore, a wear assistant or the like may feel the exterior sheet 60 hard or obtain a strong image. In order to suppress such an image degradation of the texture, it is preferable that the dimension of the first region R1 in the orthogonal direction in the contracted state is close to the dimension of the first region R1 in the contracted direction. By making the size of the first region R1 in the orthogonal direction in the contracted state close to the size of the first region R1 in the contracted direction, the convex portion 61 becomes close to a square or a circle, and a sharp image can be suppressed.

  The dimension of the first region R1 in the product longitudinal direction in the extended state of the present embodiment is 7 mm, and the dimension of the first region R1 in the product width direction is 6 mm. Further, the shrinkage rate of the exterior sheet 60 by the crotch stretchable part is 1.1 times or more and 1.5 times or less. For example, when the shrinkage rate of the exterior sheet 60 is less than 1.1 times, the exterior sheet 60 is not sufficiently contracted, and the convex portion 61 cannot be sufficiently lifted to the non-skin contact surface side. On the other hand, if the shrinkage rate of the exterior sheet 60 is higher than 1.5 times, the second region R2 in which the concave portion 62 is formed also shrinks, and the indicator may not be visible through the second region R2. .

  Further, it is desirable that the shrinkage direction of the exterior sheet 60 is along the orientation direction of the fibers of the nonwoven fabric constituting the exterior sheet 60. Since the outer sheet 60 contracts in the fiber orientation direction of the nonwoven fabric, the fiber contracts instead of narrowing the distance between the fibers, so that each fiber is deformed to shrink in a three-dimensionally lifting direction perpendicular to the orientation. In addition, the bulk of the first region R1 can be formed higher. On the other hand, when shrinking in a direction perpendicular to the fiber orientation direction, the distance between the fibers is deformed so that the fibers are two-dimensionally deformed so that the bulk of the first region R1 is effectively increased. Can not.

  In addition, the ratio of the dimension of the 1st area | region R1 in the product longitudinal direction with respect to the dimension of 1st area | region R1 in the product width direction can set 1.1-1.5 based on the expansion / contraction rate of a crotch expansion-contraction part.

(5) Comparative evaluation Table 1 shows a comparative evaluation result of the exterior sheet. As shown in Table 1, tests were performed on the exterior sheets according to Examples 1 to 3 and Comparative Examples 1 to 3.

  As shown in Table 1, comparative evaluation was performed about the exterior sheet which concerns on Examples 1-3 and Comparative Examples 1-3. In the comparative evaluation test, a commercially available disposable diaper “Mooney Tape Type S Size” manufactured by Unicharm Corporation was used, and the exterior sheet according to Examples 1 to 3 and the exterior sheet according to Comparative Examples 1 to 3 were used as disposable diapers. A sample for an evaluation test was prepared by changing the sample. In addition, the exterior sheet which concerns on Example 1, Example 2, and Comparative Examples 1-3 consists of a spun bond nonwoven fabric, and the exterior sheet which concerns on Example 3 consists of a through-air nonwoven fabric.

  In the evaluation test, disposable diapers made by Unicharm Co., Ltd. “Mooney tape type S size” were targeted to 20 mothers who are usually using it. did.

In response to the question, the sensory evaluation (tactile sensation) of a sample in which the ratio of the number of persons in the following (1) exceeds 70% was evaluated as “good”. Moreover, the sensory evaluation (tactile sensation) of a sample in which the ratio of the number of persons, which is (1) below, was 70% or less was evaluated as x because the sensory evaluation (tactile sensation) was not sufficiently good.
(1) There is a difference in the appearance of the entire indicator (2) There is no difference in the appearance of the entire indicator (the same)
According to the results of such an evaluation test, the dimensional difference in the thickness direction between the concave portion and the convex portion is preferably 0.55 mm or more.

(6) Other Embodiments The shape (embossing pattern) of the concave portion 62 in the plan view of the present embodiment is a rhombus shape, but at least both the concave portion 62 and the convex portion 61 are arranged so as to overlap the indicator. The configuration is not limited to this.

  For example, in the disposable diaper in which the indicator is disposed along the product longitudinal direction, a plurality of the recesses 62 may be formed extending in the product width direction and spaced apart in the product longitudinal direction. In the disposable diaper in which the indicator is arranged along the product width direction, a plurality of the recesses 62 may be formed extending in the product longitudinal direction and spaced apart in the product width direction.

  In addition, three indicators of the present embodiment are provided along the product longitudinal direction, and the dimensions in the width direction and the product longitudinal direction of each indicator are the same. However, in a plurality of indicators provided at intervals in the product longitudinal direction or the product width direction, the area of the central indicator located at the center of the product longitudinal direction or the center of the product width is outside of the center indicator in the product longitudinal direction or in the product width direction. It may be larger than the area of the side indicator located outside.

  When the area is constant in a plurality of indicators, a wearer may feel a single mechanical image by the indicator. However, by configuring the plurality of indicators to have different areas, it is possible to give a three-dimensional effect depending on the shape of the indicator, and it is possible to impart more fabric feeling and flexibility. In particular, by increasing the width of the central indicator located in the center of the product width direction and decreasing the width of the side indicator, it is disposable so that the center of the body is located on the near side and spreads in the depth direction toward the outside in the width direction. The shape of the diaper can be emphasized, and the stereoscopic effect is further improved.

  Furthermore, the central indicator located in the center in the product longitudinal direction or the product width direction is more likely to come into contact with body fluids and change color than the side indicator. Therefore, when the area of the central indicator is larger than the area of the side indicator, it is possible to make the indicator that easily changes color stand out.

  In addition, the structure with a large area can illustrate the structure with a long width | variety which is a direction orthogonal to the direction where an indicator extends, and the structure where the length of the direction where an indicator extends is long.

  Moreover, the exterior sheet 60 should just be provided with 1st area | region R1 and 2nd area | region R2 from which the visibility of an indicator differs, As an actual structure of 1st area | region R1 and 2nd area | region R2, embossing is carried out. It is not limited to the convex part 61 and the concave part 62 formed by.

  For example, the thickness of the exterior sheet 60 in the first region R1 may be thicker than the thickness of the exterior sheet 60 in the second region R2, or the fiber density of the nonwoven fabric constituting the exterior sheet 60 in the first region R1 May be configured to be higher than the fiber density of the nonwoven fabric constituting the exterior sheet 60 in the second region R2, and the fiber basis weight of the nonwoven fabric constituting the exterior sheet 60 in the first region R1 is in the second region R2. It may be configured higher than the fiber density of the nonwoven fabric constituting the exterior sheet 60, or these configurations may be combined.

  For example, by forming the fiber basis weight of the nonwoven fabric constituting the exterior sheet 60 in the first region R1 higher than the fiber density of the nonwoven fabric constituting the exterior sheet 60 in the second region R2, the bulky convex portions and the bulk are increased. An exterior sheet having a low recess can be obtained. According to this exterior sheet, since the fiber amount of the concave portion is smaller than the fiber amount of the convex portion, a difference in visibility easily occurs between the convex portion and the concave portion.

  In the embodiment described above, it has been described that the disposable diaper 10 can be suitably used for infants, but the scope of the present invention is not limited to disposable diapers for infants, for example, for pediatrics and adults. Of course, it can also be applied to disposable diapers.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

10 ... disposable diapers
20 ... Front waist area
25 ... Inseam
30 ... rear waist area
35… Leg opening
40 ... absorber
40a ... Absorption core
40b ... Core wrap
50… Top sheet
60a… Back sheet
60… Exterior sheet
61 ... Convex
62 ... recess
70 ... side flap
75 ... Leg stretchable part
80… Legside gather
90 ... Fastening tape
200 ... Crotch expansion / contraction part
R1 ... 1st area
R2 ... 2nd area

Claims (8)

A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
A product longitudinal direction from the front waistline region to the rear waistline region, and a product width direction orthogonal to the product longitudinal direction,
An absorbent body straddling the crotch region and extending to at least one of the front waistline region and the rear waistline region;
A liquid-impermeable backsheet disposed on the non-skin contact surface side of the absorbent body;
An exterior sheet made of a nonwoven fabric disposed on the non-skin contact surface side from the back sheet;
A disposable diaper comprising: an indicator arranged on the skin contact surface side from the back sheet and configured to visually change when it comes into contact with moisture,
The exterior sheet is provided with a first area where the indicator can be visually recognized from the non-skin contact surface side of the exterior sheet, and a second area where the visibility of the indicator is higher than the first area. And
A disposable diaper, wherein at least a part of the first region and at least a part of the second region are arranged to overlap the indicator. The skin contact surface side from the back sheet is provided with an expansion / contraction part that expands and contracts in at least one of the product longitudinal direction and the product width direction,
The disposable diaper according to claim 1, wherein at least a part of the stretchable part is disposed so as to overlap the indicator.   The disposable diaper according to claim 2, wherein the back sheet and the exterior sheet are joined to each other via an adhesive applied intermittently to the back sheet or the exterior sheet. The dimension of each first region in the contraction direction of the stretchable part is 3.0 mm or more and 15.0 mm or less,
The dimension of each first region in the orthogonal direction orthogonal to the shrinkage direction is 2.0 to 13.6 mm.
The disposable diaper according to claim 2 or 3, wherein a ratio of a dimension of each first region in the contraction direction to a dimension of each first region in the orthogonal direction is 1.1 to 1.5. On the exterior sheet, a convex portion and a concave portion are formed by embossing,
The disposable diaper according to any one of claims 1 to 4, wherein the first region is a region provided with the convex portion, and the second region is a region provided with the concave portion. The dimensional difference in the thickness direction of the concave portion and the convex portion is more than 0.55 mm, the disposable diaper according to claim 5. A plurality of the indicators are provided at intervals in the product longitudinal direction or the product width direction,
The area of the central indicator located in the product longitudinal direction center or the product width direction center is larger than the area of the side indicator located on the product longitudinal direction outer side or the product width direction outer side than the central indicator. The disposable diaper in any one of Claim 6 from.   The color difference of L * a * b * color system L * between the overlapping area overlapping the indicator of the exterior sheet and the area surrounding the overlapping area of the exterior sheet is more than the state before the indicator changes color. The disposable diaper according to any one of claims 1 to 7, wherein a state after the indicator is discolored is higher.

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