TWI602551B - Disposable diapers - Google Patents

Description

Disposable disposable diaper

This invention relates to disposable diapers.

Conventionally, there is a front waist region, a rear waist region, and a crotch region between the front waist region and the rear waist region, and a pair of foot opening portions are formed, and the front waist region and the rear waist region are provided across the armpit region. Disposable disposable diapers for the extended absorbent body are well known.

Patent Document 1 discloses a disposable diaper for such a disposable diaper, in order to notify the wearer of the replacement diaper of the disposable diaper, a hydrophilic agent which is visually changed by contact with moisture. As a technique for the indicator to be placed in the underarm area. The disposable diaper of Patent Document 1 has a translucent region having a light transmittance of 40% or more, and an indicator is provided on a member which is further inside the sheet of the translucent region.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2005-27884

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

The disposable disposable diaper described above is provided with a sheet having a translucent area on a surface closer to the skin contact side than the indicator. Therefore, the indicator is clearly displayed on the outer side surface of the disposable disposable diaper, and the indicator becomes conspicuous. Further, the underpants do not have an indicator, which is a structure of a disposable disposable diaper. By the conspicuousness of the indicator, it is possible to express the disposable disposable diaper and emphasize the functional surface of the disposable disposable diaper.

In recent years, in the case of the disposable disposable diaper, the functional surface of the disposable diaper is required to be increased, and the user who desires the texture such as underwear such as softness and skin feel is increased. Such a user has a tendency to require a disposable disposable diaper having both the function of a disposable diaper and the flexibility of a pant. Since the indicator of the disposable disposable diaper is overly conspicuous, the user feels that the functional surface of the disposable disposable diaper is excessively emphasized, and the evaluation of the texture of the disposable disposable diaper cannot be improved. .

Accordingly, the present invention has been made in view of the above problems, and an object of the invention is to provide a disposable disposable diaper which can exhibit the function of an indicator and enhance the texture of the disposable disposable diaper. Disposable disposable diapers.

The disposable disposable diaper (disposable disposable diaper 10) of the present invention has a front waistline region, a rear waistline region, and a front The underarm region between the front waistline region and the rear waistline region further has a product longitudinal direction from the front waistline region toward the rear waistline region; and a product width direction orthogonal to the longitudinal direction of the product; An absorbent body extending in at least one of the front waist region and the rear waist region; and a liquid-impermeable back sheet disposed closer to the non-skin contact surface than the absorbent body; The back sheet is closer to the non-skin contact surface side and is made of a non-woven fabric, and is disposed on the side closer to the skin contact surface than the back sheet, and is configured to be visually changed when it comes into contact with moisture. The indicator sheet is characterized in that: the outer sheet is provided with a first region in which the indicator can be recognized from a non-skin contact surface side of the outer sheet; and the visibility of the indicator is higher than the first region In the second region, at least a part of the first region and at least a part of the second region are arranged to overlap with the indicator.

10‧‧‧Disposable disposable diapers

20‧‧‧ Front waist area

25‧‧‧胯下区域区

30‧‧‧After waist area

35‧‧‧foot opening

40‧‧‧absorbing layer

40a‧‧‧Absorbing core material

40b‧‧‧ core material cladding

50‧‧‧ top sheet

60a‧‧‧back sheet

60‧‧‧Outer sheets

61‧‧‧ convex

62‧‧‧ recess

70‧‧‧Fringe

75‧‧‧foot expansion

80‧‧‧foot folds

90‧‧‧ buckle

200‧‧‧ Pants expansion joint

R1‧‧‧1st area

R2‧‧‧2nd area

Fig. 1 is a developed plan view of the disposable disposable diaper of the present embodiment.

Figure 2 is a cross-sectional view of the disposable diaper used along the line F1-F1 shown in Figure 1.

Figure 3 is a cross-sectional view of the disposable diaper used along the line F2-F2 shown in Figure 1.

Figure 4 is a developed rear view of the disposable disposable diaper shown in Figure 1.

Fig. 5 is an enlarged view of a portion A shown in Fig. 4.

Figure 6 is a cross-sectional view taken along the line F3-F3 shown in Figure 5.

Next, an embodiment of the disposable disposable diaper 10 according to the present invention will be described with reference to the drawings. In the following description, the same or similar reference numerals are given to the same or similar parts. However, the figure is a schematic display, please note that the ratio of each size will be different from the real thing.

Therefore, the specific dimensions and the like should be judged by referring to the following description. Further, each of the drawings may include a difference in the relationship between the dimensions and the ratio of the dimensions.

Further, in the present embodiment, the disposable disposable diaper 10 for belt type will be described as an example, but the present invention is also applicable to the disposable disposable diaper 10 for shorts.

(1) The overall schematic structure of disposable disposable diapers

Fig. 1 is a developed plan view of the disposable disposable diaper 10 of the present embodiment. Figure 2 is a cross-sectional view of the disposable diaper used along the line F1-F1 shown in Figure 1. Figure 3 is a cross-sectional view of the disposable diaper used along the line F2-F2 shown in Figure 1. Figure 4 is a developed rear view of the disposable disposable diaper shown in Figure 1. The expanded view shown in Figs. 1 and 4 is such that the elastic member 81 of the leg stretch portion 75 and the leg gathers 80 is stretched to the top sheet 50, the side flaps 70, and the like which are formed after the disposable disposable diaper, and wrinkles are not formed. State diagram of the state.

The disposable 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 that comes into contact with the wearer's front waistline (abdomen portion). Further, the rear waistline region 30 is a portion that comes into contact with the wearer's rear waistline portion (back portion). The underarm region 25 is located between the front waistline region 20 and the rear waistline region 30.

Further, the disposable disposable diaper 10 is formed with a pair of leg openings 35. The leg opening portion 35 is provided at the side end portion of the product disposable diaper in the width direction of the disposable diaper, and is disposed along the wearer's foot in a state where the disposable disposable diaper is worn by the wearer. Part of it.

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

The disposable disposable diaper 10 includes an absorber 40 that extends across the crotch region 25 and extends from the crotch region 25 toward at least one of the front waist region 20 and the rear waist region 30. The absorber 40 is composed of an absorbent core 40a and a core wrap layer 40b.

The absorbent core material 40a can be formed of the same material as that of the conventional disposable disposable diaper, and can be suitably configured using a known member such as pulverized pulp or a high-absorbent polymer. The absorbent core material 40a is wrapped around the clad layer 40b by a sheet-like core material.

The core material wrapping layer 40b is a sheet covering the absorbent material 40a. A part of at least the skin surface side of the core wrapping layer 40b is composed of various fiber nonwoven fabrics or tissue sheets having liquid permeability. For example, a hot air fiber nonwoven fabric having a mass of about 10 to 30 g/m ² , a spunbonded nonwoven fabric, an SMS (spunbond-melt-spray-spun) nonwoven fabric, or a tissue sheet having a mass of about 10 to 30 g/m ² may be used.

A liquid permeable top sheet 50 is provided on the surface side (skin contact surface side) of the absorber 40. Further, on the back side (non-skin contact surface side) of the absorber 40, a liquid-impermeable back sheet 60a is provided. The liquid-impermeable back sheet 60a is closer to the back side (non-skin contact surface side), and is provided with an outer sheet 60 made of a non-woven fabric. Moreover, the indicator 65 which is configured to change visually when it comes into contact with moisture is provided on the side of the back surface of the back sheet which is closer to the skin contact surface. The structure of the indicator 65 and the exterior sheet 60 will be described in detail later.

The side edge portions of the absorber 40 in the product width direction W are provided with the even side fins 70, respectively. The side panel 70 spans the front waistline region 20, the crotch region 25, and the rear waistline region 30, and is disposed closer to the outer side in the product width direction than the absorbent body 40. The side panel 70 is composed of one sheet or a nonwoven fabric in which a plurality of sheets or more are stacked. Further, each of the pair of side panels 70 is provided with a buckle 90.

The buckle belt 90 is formed as a pair, and extends in the rear waist region 30 along the product width direction W, and the disposable disposable diaper 10 is held by the non-skin abutting surface fixed to the front waistline region 20 On the wearer's body.

The target portion 95 is formed in a pair and is configured as a non-skin contact surface disposed in the front waist region, and is fixedly attached to the pair of buckles 90, respectively.

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

Moreover, the disposable disposable diaper 10 is provided with the crotch expansion-contraction part 200 arrange|positioned in the area|region which overlaps the absorber of the crotch area|region 25. In addition, the structure of the crotch expansion-contraction part 200 is demonstrated in detail later.

The side panel 70 is provided with a pair of leg expansion and contraction portions 75 that are disposed on the inner side in the product width direction of the leg opening portion 35 and that can be extended and contracted in the product longitudinal direction L.

The leg stretchable portion 75 is longer in the longitudinal direction L of the product than the crotch stretchable portion 200, and is provided at a position outside the crotch expansion-contraction portion 200 in the product width direction W.

The leg expansion portion 75 is configured such that the leg opening portion 35 can be expanded and contracted in the longitudinal direction of the product, and can be disposed along the leg opening portion 35 or in a state in which a part of the leg opening portion 35 is inclined.

Further, the leg stretchable portion 75 is formed of a stretchable sheet, a linear rubber or the like. The leg stretchable portion 75 is a portion that can be stretched and contracted in the longitudinal direction of the product, and the portion in which the stretchable sheet is disposed in a state where the contraction force is not exerted is removed.

Further, the inside of the pair of leg expansion and contraction portions 75 (the center position in the product width direction W) is provided with one of the pair of leg side gathers 80 extending in the longitudinal direction L of the product. The foot side wrinkles 80 are provided on the side panels 70 The inner end portion in the product width direction is disposed closer to the inner side of the product width direction than the leg stretch portion 75. The leg side wrinkles 80 are disposed at positions closer to the inner side in the product width direction than the leg stretch portion 75. The foot wrinkle 80 can be configured by a conventional structure, and specifically, can be configured by a sheet material different from the side panel 70.

Further, a waist elastic-contracting portion 85 that can expand and contract in the width direction of the product is provided between one of the fastener belts in the product width direction. The waist elastic portion 85 is contracted in the product width direction between the buckles.

In the present embodiment, the waist elastic-contraction portion 85 is formed of a stretchable sheet. The member constituting the waist elastic-contraction portion 85 is not particularly limited, but a member which is as thin as possible and has low bending rigidity and a small shrinkage ratio is preferably used. By forming the waist elastic-contraction portion 85 with a material having low bending rigidity, the waist elastic-contraction portion 85 is easily bent along the body, and the waist elastic-contraction portion 85 can be fitted along the body without applying a load to the wearer's body. Moreover, by forming the waist stretchable portion 85 with a material having a small neck-reduction ratio, it is possible to suppress shrinkage of the product in the longitudinal direction of the disposable diaper after the disposable diaper is stretched in the product width direction after use. The wearer's waistline can prevent the disposable disposable diaper from sliding down toward the underside of the chin.

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 then applied to the outer sheet 60 by a hot melt adhesive or heat treatment after being extended to 1.2 to 2.5 times the length of the non-stretched state (natural state).

In the present embodiment, the waist elastic-contraction portion 85 is disposed on the exterior. Between the sheet 60 and the back sheet 60a. However, the core stretchable portion 85 may be disposed on the core wrap layer 40b and the back sheet 60a or the outer sheet 60 in a structure in which the core wrapping layer 40b extends to the outer side in the longitudinal direction of the product more than the absorbent core member 40a. between. The position of the waist elasticized portion is not particularly limited. Further, the region in which the absorber is not disposed may be disposed between the side sheet 70 and the back sheet 60a or the exterior sheet 60.

Further, the waist elasticized portion of the present embodiment is configured to expand and contract in the product width direction. However, the waist elasticized portion may be configured to expand and contract in the product width direction and the product longitudinal direction.

The buckle 90 is attached to a region of the side panels 70 corresponding to the rear waist region 30. The buckle 90 is provided with a base sheet 91 coupled to the side panel 70, and a hook sheet 92 provided with a plurality of engagement hooks (not shown) as engagement members, and is fixed to the base sheet 91. The hook sheet 92 is a region in which an engaging member is provided, and the waist holding portion is a region extending from the hook sheet 92 in the product width direction.

The hook sheet 92 is fixed to the base sheet 91, specifically, to the base sheet. The joining of the hook sheet 92 to the base sheet 91 is desirably such that the rigidity of the buckle 90 is not formed to exceed the required rigidity. Specifically, it is preferable that the hook sheet 92 and the base sheet 91 are joined by a hot melt adhesive which is applied intermittently in a dot shape, a line shape or a spiral shape. Further, the hook sheet 92 and the base sheet 91 can be joined by heat sealing or the like.

The base sheet 91 is composed of one sheet or a nonwoven fabric in which a plurality of sheets or more are stacked. As the base 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 (in the case of a plurality of sheets, the total basis weight) is 30 to 120 g/m ² , and preferably 40 to 90 g/m ² .

(2) The shape of the crotch expansion joint

Next, the shape of the crotch stretch unit 200 will be described.

When the disposable diaper 10 is worn by the disposable diaper 10 to the wearer, the portion of the crotch region 25 can maintain a flat shape compared to the other portion of the absorbent body 40.

Here, the crotch stretchable portion 200 can be expanded and contracted in the longitudinal direction L of the product, and can be expanded and contracted in the product width direction W, and can also be expanded and contracted in both the product longitudinal direction L and the product width direction W.

For example, the crotch expansion-contraction portion 200 is separately provided separately from the leg expansion-contraction portion 75, and is configured to overlap the absorbent core member 40a (in the present embodiment, the core-wrapped layer 40b enclosing the absorbent core member 40a) The position between the back sheets 60a shrinks 60% or more of the length (natural state) of the absorbent core material 40a at the position in the product width direction W.

As described above, the portion in which the absorbent core member 40a is disposed is contracted by the crotch expansion-contraction portion 200, so that the absorbent core member 40a contracts, and the flat shape is easily maintained compared to the portion where the absorbent core member 40a is not contracted.

Further, the absorbent core member 40a located in the waist region 20 and the rear waist region 30 before the crotch expansion-contraction portion 200 is closer to the outer side in the longitudinal direction L of the product does not contract by the crotch expansion-contraction portion 200.

Therefore, by the buckle 90, the disposable diaper is maintained in a flat shape while being held by the wearer's waist and waist. The crotch elasticized portion 200 of the crotch region 25 of 10 is not excessively adhered to the body, and as a result, the crotch elasticized portion 200 can be appropriately disposed along the body.

Further, in the case where the crotch expansion-contraction portion 200 can be expanded and contracted along the longitudinal direction L of the product, the front waistline region 20 and the rear waistline region 30 are easily erected by the contraction of the crotch expansion-contraction portion 200, and can be worn when worn. The lower part of the user's crotch forms a flat underarm area along the body.

As a result, since the front waistline region 20 and the rear waistline region 30 stand up from the crotch expansion-contraction portion 200, the fit of the disposable disposable diaper 10 to the wearer can be improved.

That is, by the contraction of the crotch stretchable portion 200, the disposable disposable diaper 10 can be stably worn, and the underarm region 25 of the disposable disposable diaper 10 can be placed in the crotch portion of the wearer.

Further, as described above, since the crotch stretchable portion 200 is configured to be expandable and contractible, one portion of the crotch region 25 of the disposable disposable diaper 10 is shrunk and the ready-to-wear side of the disposable disposable diaper 10 is used. The surface of the skin contact surface side is formed with irregular wrinkles. As a result, it is possible to visually recognize the wearing aid and visually feel the tummy portion in the disposable diaper 10 after the embodiment.

Further, the crotch stretch unit 200 may be formed of a stretchable sheet. By forming the underarm stretchable portion 200 with the stretchable sheet, the absorbent core member 40a in the region in which the stretchable sheet is disposed is contracted in the same manner, and it is easier to maintain a flat shape. Further, the stretchable sheet may be configured, for example, in the same stretchable sheet as the leg stretch portion 75.

For example, as the stretchable sheet, a film-like stretchable film obtained by melting a thermoplastic elastomer such as urethane or styrene, or a stretchable nonwoven fabric composed of stretchable fibers, or A composite sheet or the like which is formed by a non-stretchable sheet in which a pasting portion such as a stretchable film or a stretchable nonwoven fabric is cut or weakened.

Moreover, in place of the stretchable sheet, the elastically stretchable elastic members made of a polyurethane or a natural rubber or the like are arranged in parallel to each other to form the crotch stretchable portion 200.

In this case, the rigidity of the absorbent core material 40a and the rigidity of the other members of the disposable disposable diaper 10 can be appropriately selected, and the thickness of the elastic member to be used, the pitch of the arrangement, and the like can be appropriately selected, but it is desirable. When the main body of the disposable disposable diaper 10 is in a natural state (non-stretched state), the entire edge portion of the absorbent core member 40a in the product width direction W is in a contracted state.

Moreover, in order to shrink the absorbent core material 40a by the crotch stretchable portion 200, the interval between the elastic members is set to 7 mm or less, and more preferably 5 mm or less. Moreover, in order to shrink the absorptive core material 40a similarly, it is desirable to make the difference of the space|interval of the adjacent elastic member into 2 mm or less.

Specifically, the expansion ratio of the crotch stretch unit 200 is preferably 1.1 times or more and 1.5 times or less. For example, in the present embodiment, the expansion ratio of the crotch expansion-contraction portion 200 is set to 1.25 times.

The expansion ratio means the degree of expansion and contraction of the crotch expansion-contraction portion 200 in the contraction direction (in the longitudinal direction L of the product in the present embodiment), as follows The way is prescribed.

The expansion ratio = (the length of the contraction direction of the crotch expansion-contraction portion 200 in the maximum extension state) / (the length of the contraction direction of the crotch expansion-contraction portion 200 in the natural state)

Further, in the present description, the expansion ratio is measured, for example, in the following manner.

First, in the case where the disposable disposable diaper 10 is packaged in a package or the like, the disposable disposable diaper 10 is taken out from the sealed package, in this state at 20 ° C ± 2 ° C, relative humidity 60% ± 5%. The environment of the RH was allowed to stand for 60 minutes, and the length of the crotch stretch unit 200 was measured along the contraction direction. This length is taken as [the length of the crotch stretch unit 200 in the natural state].

Secondly, the length of the contraction direction of the desired region in the state (that is, the natural state) and the contraction direction of the desired region when the state is extended from the natural state until the wrinkles generated by the elastic member are not visually recognized are measured. The length. This length is taken as [the length of the crotch stretch unit 200 in the extended state].

Using these measurement results, the elongation was measured by the above formula.

In addition, the measurement of [length] of this specification is performed by the following measuring methods.

In the case where the disposable disposable diaper 10 is packaged in a package or the like, it is taken out in a self-sealing package and placed in an environment of 20 ° C ± 2 ° C and a relative humidity of 60% ± 5% RH for 12 hours.

Then, using a spring measuring instrument (belt: coated with polyvinyl chloride having glass fibers) manufactured by Affinity Co., Ltd., the length of the state of disposable disposable diaper 10 is measured along the measurement target portion, that is, The length of the pant stretch unit 200 in the natural state of the disposable diaper 10 is used. In addition, the length of the stretched state is measured by extending the disposable disposable diaper 10 to the length of the crotch stretchable portion 200 when the state of wrinkles due to the elastic member cannot be visually confirmed from a natural state.

Here, the above-described measurement was performed on each of the ten samples, and the average value was taken as the length. Based on the measured length as described above, the area can be calculated.

By setting the expansion ratio of the crotch stretchable portion 200 to 1.1 times or more and 1.5 times or less, it is possible to ideally follow the stretch of the wearer's skin.

For example, when the wearer makes a forward flexion posture in which the front side of the body is contracted, the skin on the buttock side of the wearer has a portion extending about 30% of the state of the extended body.

In other words, when the elongation of the crotch expansion-contraction portion 200 is 1.1 or less, the expansion and contraction of the crotch expansion-contraction portion 200 in the natural state is insufficient, and the disposable cuff-extension portion 200 is not used. The shrinkage of the absorbent body arrangement region of the crotch region 25 of the disposable diaper 10 is small, and the crotch region 25 of the disposable disposable diaper 10 is not in the lower part of the wearer's crotch, and the flat shape is not obtained along the body. Sufficiently, the disposable disposable diaper 10 is easily deflected from the wearer's body.

In addition, when the expansion ratio of the crotch expansion-contraction portion 200 is made When the size is 1.5 times larger, the contraction size of the crotch expansion-contraction portion 200 is excessively large, so that the area where the crotch expansion-contraction portion 200 exists is likely to be in close contact with the body along the body, resulting in abandonment after use. The disposable diaper 10 is easily offset toward the underside of the wearer.

Further, the amount of contraction of the crotch stretchable portion 200 in the longitudinal direction L of the product may be 2 to 8% of the length of the product longitudinal direction L of the discarded disposable diaper 10 after use.

Further, the contraction amount is such that the length of the sample becomes small and the surface of the sample becomes a near-smooth state "b (mm)" and the length of the natural state of the sample in the contraction direction "a (mm)" The difference can be calculated by (ba).

The inventors have confirmed that when the amount of shrinkage in the product longitudinal direction L of the crotch stretchable portion 200 is 2 to 8% of the length of the product longitudinal direction L of the discarded disposable diaper 10, it is discarded after use. During the wearing of the disposable diaper 10 to the wearer, the crotch stretch unit 200 can be easily and desirably along the wearer's body.

Here, when the contraction amount of the crotch stretchable portion 200 in the longitudinal direction L of the product is made larger than 8%, the crotch stretchable portion 200 is excessively shrunk, resulting in the length of the product longitudinal direction L of the disposable disposable diaper 10 after use. Insufficient, it becomes difficult to wear the disposable disposable diaper 10 to the wearer's body, or the disposable disposable diaper 10 and the wearer's body become excessively adhered in the underarm region 25 and are easily biased. shift.

Further, when the shrinkage amount in the longitudinal direction L of the crotch stretchable portion 200 is 2% or less, it is less likely to be disposable after use. The diaper 10 is close to the effect produced by the crotch stretch unit 200 of the wearer's body.

Further, the center O2 of the crotch expansion-contraction portion 200 in the longitudinal direction L of the product is disposed closer to the front waistline region 20 than the center O1 of the disposable diaper 10 after being used in the longitudinal direction L of the product. Further, the crotch stretch unit 200 is disposed so as to straddle the center O1 of the disposable diaper 10 after the product length direction L is used.

Further, the crotch stretch unit 200 is formed at a position O1 of the disposable diaper 10 after the product length direction L is included.

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

Specifically, the ratio of the length (natural state) of the product in the longitudinal direction L of the back waistline region 30 to the length (natural state) of the product longitudinal direction L of the front waistline region 20 is preferably 1.1 or more and 1.6 or less, and is 1.2 or more and 1.5 or less. The following is better.

When the ratio exceeds 1.6, the balance between the abdomen side and the back side of the disposable disposable diaper 10 collapses, and the front waistline region 20 is excessively adhered or rear waistline in the case where the crotch expansion-contraction portion 200 is along the crotch region 25. Area 30 is over-covered.

Specifically, the wearer's body is generally in a state in which the buttocks are more prominent than the lower abdomen. Therefore, when the crotch expansion-contraction portion 200 is fitted to the wearer's crotch portion, the ratio is made to be the aforementioned range. For the shape of the complex wearer's body, a disposable disposable diaper 10 can be used. For a more appropriate shape.

That is, it is possible to prevent the disposable disposable diaper 10 from partially protruding due to the occurrence of the insufficient size portion, or the formation of an unnecessary gap between the disposable disposable diaper 10 and the body due to the occurrence of the excessively large portion. The situation arises.

In addition, it is preferable to use a posture in which the body is rounded toward the abdomen, and it is preferable to use a posture in which the body is rounded toward the abdomen. By setting the above ratio within the above range, it is possible to form a state suitable for the body of the infant who is easy to make such a posture.

As an example, the product length of the disposable disposable diaper 10 is 400 mm (the length of the natural state in the product longitudinal direction L), and the front waistline region 20 is set to 130 mm (the length of the natural state in the product longitudinal direction L), and the crotch expansion-contraction portion is used. It is set to 80 mm (the length of the natural state of the product longitudinal direction L), and the back waistline area 30 is set to 100 mm (the length of the natural state of the product longitudinal direction L).

In this case, the ratio of the length of the front waistline region 20 to the back waistline region 30 (natural state) is about 1.46. By making such a ratio, not only the crotch stretchable portion 200 but also the disposable disposable diaper 10 can be further along the wearer's body in the longitudinal direction L of the product.

That is, according to this configuration, it is possible to more reliably achieve the position in the front-rear direction by determining the crotch expansion-contraction portion 200, so that the disposable disposable diaper 10 correctly conforms to the wearer's body and disposable paper The purpose of the present invention is to shape the diaper 10.

The state in which the crotch expansion-contraction portion 200 is contracted is different from the state in which the absorbent body arrangement region on the front waistline region 20 side and the rear waistline region 30 side is closer to the crotch expansion-contraction portion 200, and therefore is different. When the disposable disposable diaper 10 is worn by the wearer, it is easy to wear the crotch stretchable portion 200 in conformity with the wearer's crotch portion.

Further, according to this arrangement, in a state where the portion where the absorbent core member 40a of the crotch stretchable portion 200 is shrunk, since the rigidity or thickness of the portion is different from the rigidity or thickness of the portion of the other absorbent core member 40a, It is easy for the wearer to recognize the portion of the crotch region 25 of the disposable disposable diaper 10 that matches the lower portion of the wearer's crotch.

Further, after the disposable disposable diaper 10 is worn, the crotch stretchable portion 200 maintains a flat shape in the lower portion of the wearer's crotch, and the disposable disposable diaper 10 itself has a three-dimensional shape. After use, the underarm region 25 of the disposable diaper 10 is placed along the lower portion of the wearer's crotch, so that the underarm region 25 of the disposable disposable diaper 10 can be worn in conformity with the wearer's crotch portion. .

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

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

Further, instead of forming the notch portion 110 and the notch portion 120, the basis weight of the absorbent core member 40a may be made to be more absorbent. The portion of the core material 40a is low.

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

Furthermore, even if the notch portion 110 and the notch portion 120 are formed, the absorbent core material 40a located in the front waistline region 20 and the back waistline region 30 and the absorbent core material 40a located in the crotch region 25 are not completely It is preferred to separate and continuously, and it is particularly preferable to continue in the width direction W of the product.

The notch portion 110 and the notch portion 120 are configured such that the length (natural state) of the product longitudinal direction L becomes longer as it goes to the outer side in the product width direction W.

With such a shape, the outer side in the product width direction W of the absorbent core member 40a is more easily contracted, and therefore, it is easier to form a flat [bottom] in the disposable disposable diaper 10 after use.

Further, the absorbent core member 40a located closer to the front waistline region 20 than the notch portion 110 and the absorbent core member 40a located closer to the back waistline region 30 than the notch portion 120 are easily bent to stand from the flat [bottom] And along the arc curve of the wearer's body (abdomen and buttocks), the shape of the disposable disposable diaper 10 can be used to be closer to the shape of the wearer's body.

As shown in FIG. 1, the edge portion of the front waistline region 20 side of the notch portion 110 and the edge portion of the notch portion 120 closer to the rear waistline region 30 side may have an arc shape.

Specifically, the front waist region 20 side of the notch portion 110 The edge portion has a shape in which the center of the arc is located closer to the back waistline region 30 than the edge portion, and the edge portion of the back waist region 30 side of the notch portion 120 is located at the center of the arc which is closer to the front waistline than the edge portion. The shape of the area 20 side.

With such a shape, the deformation of the disposable disposable diaper 10 along the arc curve of the wearer's body becomes easier and more conspicuous.

The edge portion on the side of the waist region 20 before the product longitudinal direction L of the notch portion 110 constitutes the first inversion portion 115, and the edge portion on the side of the waist region 30 after the product longitudinal direction L of the notch portion 120 constitutes the second inflection point 125.

Further, the first inflection point 115 and the second inflection point 125 are configured to extend in the product width direction W, and become a bending base point of the disposable disposable diaper 10.

As shown in Fig. 1 and Fig. 2, in the disposable diaper 10 after use in the present embodiment, in a natural state, the crotch stretchable portion 200 can be bilaterally symmetrical across the center line O of the product width direction W, and can also be a product. The center line O in the width direction W is the boundary, and the difference in width between the left and right sides of the crotch stretch unit 200 is made 10% or less.

According to the disposable disposable diaper 10 of the present embodiment, the crotch stretchable portion 200 can be worn in the lower portion of the wearer's crotch across the center of the wearer's body.

Moreover, in the disposable diaper 10 after use in the present embodiment, the crotch stretchable portion 200 is disposed apart from the waistline holding portion and the elastic member 71.

Moreover, after the use of the embodiment, the disposable diaper 10 is A non-stretchable region is provided on the waist region 20 side and the rear waist region 30 side before the product longitudinal direction L of the crotch expansion-contraction portion 200.

Further, in the disposable diaper 10 after use in the present embodiment, as shown in Figs. 1 and 2, the length of the absorbent core member 40a in the product width direction W is changed from the front waistline region 20 to the crotch region 25. Short, from the back waist region 30 to the underarm region 25 becomes shorter.

Here, the crotch stretch unit 200 is provided in a region in which the length of the absorbent core member 40a in the product width direction W is shorter than a predetermined length.

In the region where the length of the absorbent core member 40a in the product width direction W is shorter than the predetermined length, since the absorbent body 40 has a small absorption capacity, the absorbent liquid of the wearer cannot be absorbed by the absorbent body 40 in the region, and it is easy to be The product in the longitudinal direction L of the region is absorbed by the absorber 40 on the side of the waist region 20 and the side of the rear waist region 30.

As a result, the discoloration of the indicator 65 is easily transmitted from the region toward the front waistline region 20 side and the rear waistline region 30 side.

Generally, in the region where the crotch expansion-contraction portion 200 is provided, since the wrinkles due to the crotch expansion-contraction portion 200 are generated, the wearing assistant sees the discoloration of the indicator 65 in the region and the non-elastic region. different.

When considering the above points, according to the above configuration, the wear assistant can use the discoloration of the indicator 65 in the area as the disposable disposable diaper 10, and in the longitudinal direction L of the product in the area. The discoloration of the indicator 65 of the non-stretchable region on the side of the front waistline region 20 and the side of the rear waistline region 30 serves as a reference for the disposable disposable diaper 10 after replacement.

As a result, it is possible to suppress the disposable paper urine after excessive replacement. The cloth 10 can also be notified of the replacement time point of the disposable disposable diaper 10 after use.

(3) Structure of the indicator

The disposable diaper 10 after use in the present embodiment is provided with an indicator 65. The indicator 65 extends across the crotch stretch unit 200 toward the product length direction L and is formed by a color change agent that produces a visual change when in contact with moisture.

According to this configuration, when the crotch stretchable portion 200 is worn along the wearer's body (the crotch portion) when worn, the indicator 65 can be stably held at a position close to the wearer's excretory opening.

As a result, it is possible to prevent the indicator 65 from shifting to a state of discoloration, and to cause a situation in which the indicator 65 on the back side of the wearer is discolored or the like.

Further, since the wearer's excretory opening and the crotch expansion-contraction portion 200 are close to each other when worn, the discoloration of the first indicator 65 can be stabilized and can be generated in the crotch region 25 of the disposable disposable diaper 10.

As shown in FIG. 4, the indicator 65 may be configured to extend substantially in parallel with respect to an imaginary line extending in the longitudinal direction of the product through a center line in the product width direction W by a plurality of strips.

Moreover, when the crotch stretchable portion 200 is formed of a liquid-impermeable stretchable sheet, the indicator 65 is disposed on the skin contact surface side of the stretchable sheet. Further, when the crotch stretchable portion 200 is formed of a liquid permeable stretchable sheet, the indicator 65 is disposed in the crotch stretch unit 200. Skin abuts the side of the face.

Further, the change (discoloration) of the indicator 65 can be recognized from the non-skin contact surface side of the disposable 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 this configuration, the change (discoloration) of the indicator 65 can be recognized from the non-skin contact surface side of the disposable disposable diaper 10.

The width of the crotch stretchable portion 200 in the product width direction W is 1/2 or more of the width of the absorbent core member 40a in the product width direction W in the region where the crotch stretchable portion of the absorbent core member 40a exists.

Therefore, the crotch elastic expansion portion 200 shrinks the fixed width of the portion where the absorbent core member 40a is disposed, whereby the absorbent core member 40a contracts, and the absorbent core member 40a is lifted up to be close to the wearer's body.

By achieving lifting of the absorbent core member 40a in the crotch region, it is possible to reduce the occurrence of a gap between the disposable disposable diaper 10 and the wearer. When the width of the crotch stretchable portion 200 in the product width direction W is 60% or more of the width of the absorbent body 40 (absorbent core member 40a) in the product width direction W, it is more preferably 80% or more, and it can be further reduced. A gap between the disposable disposable diaper 10 and the wearer is created.

Further, when the width of the crotch stretchable portion 200 is too narrow compared to the width of the absorbent core member 40a, the effect of lifting the absorbent core member 40a is not easily obtained. Further, when the width of the crotch elastic-contraction portion 200 is too large, the portion where the absorbent core member 40a is not disposed is more contracted than the portion where the absorbent core member 40a is disposed, compared to the width of the absorbent core member 40a. State, wear disposable disposable diaper 10. Therefore, the members constituting the portion where the absorbent core member 40a is not disposed are overlapped with each other, and the crotch stretchable portion 200 is hardened to impair the wearing feeling of the disposable disposable diaper 10.

For example, when the size (elongation state) of the portion where the width of the region where the crotch elastic portion of the absorbent core member 40 is the smallest is 120 mm, the width of the crotch elastic portion 200 is preferably 60 to 110 mm. More preferably, the width of the crotch stretch unit 200 is 90 to 110 mm.

The portion where the width of the absorbent core member 40a is the narrowest in the product width direction W is set to the front side of the center line of the product in the longitudinal direction of 10 to 60 mm. It is preferable that the portion where the width of the absorptive core material 40a is the narrowest in the product width direction W is provided on the front side of the center line of the longitudinal direction of the product of 20 to 40 mm. The crotch stretchable portion 200 is preferably formed across a portion where the width of the absorbent core member 40a is the narrowest in the product width direction W.

The position where the right and left thighs of the wearer are closest to each other is closer to the front side than the center of the wearer's body in the front-rear direction. Therefore, by the contraction force of the crotch stretchable portion 200, the position where the width of the absorbent core member 40a is the narrowest in the product width direction W can be actively placed at the position where the right and left thigh portions of the wearer are closest to each other. In other words, even if the wearer of the mother or the like does not perform the alignment of the absorbent core member 40a, the alignment of the absorbent core member 40a can be naturally performed.

Further, the indicator 65 is configured to extend from the region where the absorbent core member 40a overlaps the crotch stretchable portion 200 in the longitudinal direction L of the product over the crotch stretchable portion 200.

According to this structure, the crotch expansion and contraction portion 200 will absorb The core material 40a and the indicator 65 are lifted up to be disposable diapers 10 which can be stably worn along the wearer's body along the wearer's body.

Further, the color difference of the L*a*b* color system L* of the overlapping area of the exterior sheet 60 overlapping the indicator and the area surrounding the overlapping area of the exterior sheet 60 is compared with the state before the indicator is discolored. The state after the indicator is discolored becomes higher.

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

Specifically, the color of the surrounding area of the overlapping area of the exterior sheet 60 is the color of the exterior sheet 60 itself, and is generally white. The white L value is 100. In the disposable diaper having such an exterior sheet 60, the overlapping area before discoloration can be made yellow (L value: 95), and the overlapping area after discoloration can be set to blue (L value: 70). According to such a configuration, the indicator before discoloration can be made inconspicuous, and the indicator after discoloration can be made conspicuous.

In addition, the measurement of the light transmittance is based on the specification of JIS-K7105, and a color difference meter (Nippon Denshoku Industries Co., Ltd., a photometric color difference meter Z-300A) is used. Specifically, a sample having a width of 5 mm and a length of 5 mm was held by a turbidimeter, and a TT value was obtained, and the obtained TT value was obtained as a total light transmittance (%).

(4) Structure of the outer sheet

Next, the exterior sheet 60 will be described in detail with reference to FIGS. 5 and 6. Fig. 5 is an enlarged schematic rear view showing a portion A shown in Fig. 4, and Fig. 6 is a sectional view taken along line F3-F3 shown in Fig. 5.

In the exterior sheet, a concave-convex shape (wrinkle) is formed by embossing. More specifically, the outer sheet 60 is formed with a convex portion 61 and a concave portion 62. The concave portion 62 is a portion that is pressed in the thickness direction by embossing, and is a portion where the thickness of the outer sheet is thinner than the convex portion 61. The convex portion 61 is a portion which is thinner than the concave portion 62, and is not embossed by the pressing portion or a portion having a lower pressing degree than the concave portion 62.

The exterior sheet 60 is composed of a nonwoven fabric having a basis weight of 10 to 40 g/m ² . This embodiment is composed of a spunbonded nonwoven fabric having a basis weight of 25 g/m ² . When the basis weight of the nonwoven fabric is larger than 40 g/m ² , it becomes difficult to suppress the outer sheet fluffing ball, and it is difficult to ensure the flexibility of the outer sheet 60, and the hair ball is easily generated. Further, when the basis weight of the non-woven fabric is less than 10 g/m ² , unevenness is likely to be formed when the embossing is performed.

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

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

In this manner, since the first region R1 and the second region R2 having different visibility of the indicator are formed on the outer sheet 60, the indicator is not comprehensive when the wearer or the like discriminates the disposable diaper from the outside. It will be identified in the same way, but will be partially identified. For example, when the entire indicator looks the same, the functional surface of the disposable disposable diaper is emphasized, and there is a case where the design is lowered or the recognized person does not easily feel the texture of the touch.

However, by providing the second region R2 having high visibility of the pointer and the first portion having low visibility of the pointer, for example, the indicator can be displayed in a stripe shape or the indicator can be displayed in a segmented manner. Therefore, it is possible to suppress a decrease in texture due to excessive conspicuity of the indicator.

Further, the first region R1 and the second region R2 may be configured such that at least the visibility of the indicator is different, and the color change pattern generated by the indicator may not be easily grasped. For example, even if the first region R1 is configured to be difficult to grasp the color change pattern generated by the indicator, the wear assistant can grasp the color change pattern of the pointer via the second region R2, and can grasp the replacement period.

Further, the color of the first region R1 and the second region R2 can be distinguished from each other, so that the visibility of the first region R1 is different from the visibility of the second region R2. Specifically, for example, by The density of the fibers to be attached to the sheet, the bulkiness, and the like are different, so that the colors of the first region R1 and the second region R2 can be distinguished depending on the color of the fibers constituting the exterior sheet. Further, by the density, the bulkiness, and the like of the fibers constituting the exterior sheet, the colors seen through the exterior sheet are different, and the colors of the first region R1 and the second region R2 can be distinguished.

Further, the configuration in which at least a part of the first region R1 overlaps with the indicator and the configuration in which at least a part of the second region R2 overlaps with the indicator includes not only the first region R1 and the second region R2 but also the first region R1 and the second region R2. The structure in which the exterior sheet 60 directly overlaps the indicator also includes the concept of a structure in which the back sheet 60a is superposed as in the present embodiment. In other words, the positional relationship is overlapped in the plane view angles shown in FIGS. 2 and 4.

Further, 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 recognized from the non-skin contact surface side of the disposable disposable diaper 10. The outer sheet 60 of the present embodiment has a light transmittance of 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 concave portion 62 is formed by crimping the fibers by embossing to form a film. Therefore, the light transmittance becomes higher than before the embossing process. Further, the convex portion 61 is a portion where embossing is not performed, and the light transmittance is lower than that of the concave portion 62.

Thus, by forming the concave portion 62 and the convex portion 61 by embossing, it is possible to easily form a concave portion which is close to the thickness direction of the indicator in the thickness direction. 62. and a convex portion 61 which is far from the indicator in the thickness direction.

Moreover, by forming the concave portion 62 and the convex portion 61 formed by embossing on the outer surface of the outer surface of the disposable disposable diaper, the outer surface of the disposable disposable diaper can be raised. Skin feels.

Further, the difference in size between the convex portion 61 of the outer sheet and the concave portion 62 in the thickness direction is desirably 0.55 mm or more. When the difference in size between the convex portion 61 of the outer sheet and the concave portion 62 in the thickness direction is 0.55 mm or more, the visibility of the indicator generated by the convex portion and the concave portion is likely to be different, and the function of the indicator can be exhibited. Effectively enhance the texture of the disposable disposable diaper.

Further, the difference in size between the convex portion 61 and the concave portion 62 in the thickness direction can be measured, for example, by the following method. In the case where the outer sheet is joined to the disposable disposable diaper, the outer sheet is peeled off by a cold spray (for example, MIKASA MG-3003). Then, the blade HA-10 is replaced with a dicing blade manufactured by KOKUYO Co., Ltd., and the region including the concave portion and the convex portion of the measurement portion of the exterior sheet is cut out. Using a microscope (Keynes VHX-100), the cross section in the longitudinal direction of the product was observed, and the thicknesses of the convex portion and the concave portion were measured, respectively, and the difference in thickness between the convex portion and the concave portion was calculated. The number of samples is 5, and the average value of the difference is the difference in size between the convex portion 61 and the thickness direction of the concave portion 62.

The crotch expansion-contraction part 200 which is an expansion-contraction part which expands and expands toward at least one of the longitudinal direction of the product and the product width direction is provided in the back surface sheet 60a to the skin contact surface side. Pantomer expansion unit 200 to A small portion is configured to overlap with the indicator.

The crotch stretch unit 200 expands and contracts in the longitudinal direction of the product, and the indicator, the back sheet 60a, and the exterior sheet 60 also expand and contract in the longitudinal direction of the product. At this time, since the concave portion 62 of the outer sheet 60 is dense due to the fibers, it is less likely to shrink, and the convex portion 61 of the outer sheet 60 is easily shrunk due to the fiber. Therefore, the difference in the dimension of the thickness direction of the convex portion 61 and the thickness direction of the concave portion 62 becomes more remarkable in the exterior sheet 60 which overlaps the crotch expansion-contraction portion. The difference in size between the convex portion 61 of the outer sheet 60 and the thickness direction of the concave portion 62 is made larger, and the difference between the visibility of the first region R1 and the visibility of the second region R2 is also remarkable.

In addition, when the convex portion 61 is formed to float from the side of the back sheet 60a (indicator side), the convex portion 61 is thickened, and the fibers constituting the convex portion 61 are diffused and reflected. Therefore, the visibility of the indicator of the first region R1 is further lowered.

The back sheet 60a and the exterior sheet 60 are joined to each other via an adhesive that is intermittently applied to the back sheet 60a or the exterior sheet 60. In the present embodiment, the back surface sheet 60a and the exterior sheet 60 are bonded to each other by the curtain coating by the curtain coating, and the back sheet 60a is bonded to the exterior sheet 60 via the adhesive.

For example, when the exterior sheet 60 and the back sheet 60a are bonded to each other by direct application to the entire adhesive, since the exterior sheet 60 and the back sheet 60a are integrated and deformed, the exterior sheet 60 and the back sheet are bonded. The sheet 60a becomes less susceptible to soft deformation. Therefore, even in the case where the crotch expansion and contraction portion is contracted, there is a contraction of the crotch portion. Shrinking, the outer sheet 60 becomes less likely to shrink. In addition, there is a case where the touch is lowered and the pants are not formed. In view of such a problem, the area ratio of the outer sheet 60 to the back sheet 60a is preferably 20% or less.

Since the adhesives applied to the back sheet 60a or the exterior sheet 60 intermittently are joined to each other, a portion where the exterior sheet 60 and the back sheet 60a are joined and a portion that is not joined are provided. Therefore, by joining the portions of the exterior sheet 60 and the back sheet 60a, the positional deviation can be suppressed, and the contraction of the crotch stretchable portion can be used to softly deform the portion where the exterior sheet 60 and the back sheet 60a are not joined. The visibility of the convex portion 61 of the outer sheet 60 and the concave portion 62 can be further different.

In addition, when the area of the outer sheet 60 and the back sheet 60a is 3% or less, the number of subsequent dots is too small, and when the shrinkage occurs, the outer sheet 60 and the back sheet 60a are excessively floated. Even in the first region having high visibility, there is a case where floating is caused by not having a plurality of joints, and the visibility is lowered. Therefore, the difference in the visibility may be a pattern in which the non-convex portion 61 and the concave portion 62 are arranged, but may be a case in which the constricted pattern generated by the subsequent dots is formed. Therefore, it is expected that the subsequent area ratio is higher than 3%.

The dimension of the first region R1 in the longitudinal direction of the product in the contraction direction of the constricted portion 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 in the orthogonal direction orthogonal to the contraction direction is 2.0 mm or more. 13.6mm or less. The ratio of the size of the first region R1 in the longitudinal direction of the product to the size of the first region R1 in the product width direction is 1.1~1.5.

When the size of the first region R1 is less than 2.0 mm, it is difficult to know the difference in visibility between the concave portion and the convex portion, which is not preferable. Further, when the size of the first region R1 is larger than 15.0 mm, the indicator itself may not be easily seen, and it is more likely that the hair is raised and the texture of the underwear is damaged.

Since the length of the first region R1 in the contraction direction of the crotch expansion-contraction portion is longer than the length of the first region R1 in the orthogonal direction, when the outer sheet 60 is contracted by the contraction of the crotch expansion-contraction portion 200, the contraction can be caused. The size of the first region R1 in the direction is close to the size of the first region R1 in the orthogonal direction.

Further, for example, when 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 1.5 times higher, even in the state where the outer sheet 60 is contracted, the first region R1 in the contraction direction is The size also becomes too long, and the shape of the planar viewing angle of the convex portion 61 becomes a sharp shape. Therefore, there is an impression that the wearer feels that the outer sheet 60 is hard or strong. In order to suppress the impression of such a texture, it is preferable to make the size of the first region R1 in the orthogonal direction of the contracted state close to the size of the first region R1 in the contraction direction. By making the size of the first region R1 in the orthogonal direction of the contracted state close to the size of the first region R1 in the contraction direction, the convex portion 61 is approximately square, circular, or the like, and the sharp impression can be suppressed.

In the extended state of the embodiment, the dimension of the first region R1 in the longitudinal direction of the product is 7 mm, and the first region R1 in the product width direction is The size is 6mm. Further, the shrinkage ratio of the outer sheet 60 according to the crotch expansion-contraction portion is 1.1 times or more and 1.5 times or less. For example, when the shrinkage ratio of the exterior sheet 60 is less than 1.1 times, the shrinkage of the exterior sheet 60 is insufficient, and the convex portion 61 cannot be sufficiently floated toward the non-skin contact surface side. When the shrinkage ratio of the outer sheet 60 is higher than 1.5 times, the second region R2 in which the concave portion 62 is formed is also shrunk, and the indicator may not be recognized by the second region R2.

Further, it is desirable that the shrinkage direction of the exterior sheet 60 is the orientation direction of the fibers along the nonwoven fabric constituting the exterior sheet 60. Since the outer sheet 60 is shrunk in the direction in which the fibers of the nonwoven fabric are oriented, the fibers are not narrowed, but the fibers are also shrunk. Therefore, the fibers are shrunk in a form that is lifted in a direction of three dimensions orthogonal to the orientation. The deformation can make the bulkiness of the first region R1 higher. Further, when contracting in a direction orthogonal to the direction in which the fibers are oriented, the distance between the fibers is narrowed, and the fibers are deformed in two dimensions so that the fibers abut each other. Therefore, the bulkiness of the first region R1 cannot be effectively effective. The ground formation is higher.

Further, the ratio of the size of the first region R1 in the longitudinal direction of the product to the size of the first region R1 in the product width direction is 1.1 to 1.5, which can be set in accordance with the expansion ratio of the crotch expansion-contraction portion.

(5) Comparative evaluation

Table 1 shows the results of comparative evaluation of the exterior sheets. As shown in Table 1, experiments were carried out on the sheets of Examples 1 to 3 and Comparative Examples 1 to 3.

As shown in Table 1, the sheets of Examples 1 to 3 and Comparative Examples 1 to 3 were comparatively evaluated. In the comparative evaluation experiment, a disposable disposable diaper [Moony belt type S size] manufactured by Utsunomiya (Japan Unicharm) Co., Ltd., which is sold in the market, was used, and Examples 1 to 3 were used. The outer sheet and the outer sheets of Comparative Examples 1 to 3 were attached and replaced with disposable disposable diapers, and samples for evaluation were prepared. Further, the exterior sheets of Example 1, Example 2, and Comparative Examples 1 to 3 were composed of a spunbonded nonwoven fabric, and the exterior sheet of Example 3 was composed of a hot air nonwoven fabric.

In the evaluation experiment, the 20 mothers of the disposable diapers [Moony belt type S size] made by Utopia (Japan Unicharm) Co., Ltd. are used for the purpose of the evaluation. The view is whether the indicators are all the same].

In response to this problem, the sensory evaluation (feel) was good for the sample in which the ratio of the number of persons in the following (1) exceeded 70%, and the evaluation was ○. For this problem, the ratio of the number of people in the following (1) is 70% or less. The sample, the sensory evaluation (feel) was not sufficiently good, and the evaluation was ×.

(1) There is a difference in opinion about the entire indicator.

(2) There is no difference (same) in the view of the entire indicator.

According to the result of such an evaluation experiment, it is preferable that the dimensional difference in the thickness direction of the concave portion and the convex portion is 0.55 mm or more.

(6) Other embodiments

In addition, the shape (embossing pattern) of the concave portion 62 of the planar viewing angle of the present embodiment has a rhombic shape. However, at least the concave portion 62 and the convex portion 61 may be disposed to overlap the indicator, and the configuration is not limited thereto.

For example, the disposable diaper after the indicator is disposed along the longitudinal direction of the product may be formed such that the concave portion 62 extends in the product width direction and is formed at intervals in the longitudinal direction of the product. Further, in the disposable diaper after the indicator is disposed along the width direction of the product, the concave portion 62 may be formed to extend in the longitudinal direction of the product and may be formed in plural in the product width direction.

Further, the indicator of the present embodiment is provided in three along the longitudinal direction of the product, and the dimensions in the width direction of each indicator and the dimensions in the longitudinal direction of the product are the same. However, the indicator provided in a plurality of manners at intervals in the longitudinal direction of the product or in the width direction of the product, the area of the central indicator located in the center of the longitudinal direction of the product or in the center of the width direction of the product may be located closer to the center indicator. The area of the side indicator closer to the outer side in the longitudinal direction of the product or the position in the width direction of the product is large.

When in a plurality of indicators, the area is constant, because of wearing The difference between the assistants and the impression that the indicator feels a single and mechanical impression. However, since the area of the plurality of indicators is different, it is possible to give a three-dimensional feeling by the shape of the indicator, and it is possible to impart a more clothy feeling, flexibility, and the like. In particular, by increasing the width of the center indicator located at the center in the width direction of the product and reducing the width of the side indicator, the shape of the disposable disposable diaper can be emphasized, so that the center of the body is located on the front side and outward in the width direction. Expanding in the deep direction can further enhance the three-dimensional feeling.

Further, the center indicator located at the center in the longitudinal direction of the product or at the center in the width direction of the product is more likely to be in contact with the body fluid than the side indicator and is easily discolored. Therefore, by making the area of the center indicator larger than the area of the side indicator, it is possible to make the indicator that is easily discolored visible.

Further, the structure having a large area is, for example, a structure having a long width in a direction orthogonal to the direction in which the indicator extends, and a structure having a long length in the direction in which the indicator extends.

Further, the exterior sheet 60 may be provided with the first region R1 and the second region R2 having different indicators, and the specific configuration of the first region R1 and the second region R2 is not limited to the embossing processing. The convex portion 61 and the concave portion 62 are formed.

For example, the thickness of the outer sheet 60 in the first region R1 may be configured to be thicker than the thickness of the outer sheet 60 in the second region R2, or may be configured as the outer sheet 60 in the first region R1. The fiber density of the nonwoven fabric is 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 may be smaller than that in the second region R2. Makeup exterior The non-woven fabric of the sheet 60 has a high fiber basis weight and may be a combination of these structures.

For example, by reconstituting the fiber base of the nonwoven fabric constituting the exterior sheet 60 in the first region R1 to be higher than the fiber basis weight of the nonwoven fabric constituting the exterior sheet 60 in the second region R2, it is possible to obtain a high bulkiness. The convex portion and the concave portion having a low bulkiness are attached to the sheet. According to the additional sheet, since the amount of fibers in the concave portion is smaller than the amount of fibers in the convex portion, the difference in visibility between the convex portion and the concave portion is likely to occur.

In the above embodiment, the disposable disposable diaper 10 is desirably described as a technical content for the infant, but the scope of application of the present invention is not limited to the disposable disposable diaper for the infant. It can also be applied to disposable diapers such as children, adults, and the like.

As such, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is determined by the specific matters of the invention from the above description only by the scope of the invention.

Further, all the contents of the Japanese Patent Application No. 2012-259160 (filed on Nov. 27, 2012) are hereby incorporated by reference.

[Industry use possibility]

It is possible to provide a disposable disposable diaper which can function as an indicator and can improve the texture of the disposable disposable diaper.

60‧‧‧Outer sheets

60a‧‧‧back sheet

65‧‧‧ indicator

1‧‧‧1st area

R2‧‧‧2nd area

Claims (8)

A disposable disposable diaper having a front waist region, a rear waist region, and a crotch region between the front waist region and the back waist region, and having a length of the article from the front waist region toward the rear waist region The direction and the product width direction orthogonal to the longitudinal direction of the product, and an absorber that extends across at least one of the front waist region and the back waist region across the crotch region; a liquid-impermeable back sheet which is closer to the non-skin contact surface side; is disposed closer to the non-skin contact surface side than the back sheet, and is formed by a non-woven fabric; and is disposed on the back sheet An indicator that changes visually when it comes into contact with moisture, and is characterized in that the outer sheet is provided to be identifiable from the non-skin contact surface side of the outer sheet a first region of the indicator; a second region having a higher visibility than the first region; at least a portion of the first region and the second region At least a portion of the indicator system is arranged to overlap. A disposable diaper for use in the first aspect of the invention, wherein the disposable diaper is disposed closer to the skin contact surface than the back sheet, and is provided with at least one of a longitudinal direction of the product and a width direction of the product. The expansion and contraction portion, at least a part of the expansion and contraction portion is overlapped with the indicator Set. A disposable diaper for use in the second aspect of the invention, wherein the back sheet and the outer sheet are joined to each other via an adhesive which is intermittently applied to the back sheet or the outer sheet. A disposable diaper according to the second or third aspect of the invention, wherein the size of the first region in the contraction direction of the elasticized portion is 3.0 mm or more and 15.0 mm or less, and is orthogonal to the contraction direction. The dimension of the first region in the intersecting direction is 2.0 to 13.6 mm, and the ratio of the dimension of the first region in the contraction direction to the dimension of the first region in the orthogonal direction is 1.1 to 1.5. A disposable disposable diaper according to any one of claims 1 to 3, wherein the outer sheet is formed with a convex portion and a concave portion by embossing, and the first region is provided with the aforementioned In the region of the convex portion, the second region is a region in which the concave portion is provided. A disposable disposable diaper according to claim 5, wherein a difference in size between the convex portion and the concave portion in the thickness direction is 0.55 mm or more. A disposable disposable diaper according to any one of claims 1 to 3, wherein the indicator is provided at a plurality of intervals in the longitudinal direction of the product or in the width direction of the product, and is located in the article. The area of the center indicator in the center of the length direction or the center of the width direction of the aforementioned article is closer to the center indicator The side indicator of the outer side in the longitudinal direction of the product or the outer side in the width direction of the product is larger. A disposable disposable diaper according to any one of claims 1 to 3, wherein the overlapping area of the outer sheet overlapping the indicator and the area around the overlapping area of the outer sheet The color difference of L* of the L*a*b* color system is configured to be higher than the state before the indicator is discolored, and the state of the indicator after discoloration is high.