TWI598082B - 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.

Here, Patent Document 1 discloses a disposable disposable diaper for such a use, in order to notify the wearer of the replacement period of the disposable disposable diaper, which is visually changed in contact with moisture. A hydrophilic agent is used as a technique for providing an indicator in the underarm area.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2004-337385

However, in the case of a baby who is a child of a low age, the number of replacement disposable diapers is large and there are many replacements in the middle of the night, but the disposable diapers described in Patent Document 1 are used. In the opinion that the situation is stably installed on the wearer, sufficient measures are not taken.

Further, in the case where the wearer is a baby of high age, since the wearer also operates when the disposable diaper is used after installation, it is necessary to dispose of the wearer in a short period of time. The disposable diaper of the disposable diaper described in Patent Document 1 is not easily attached to the wearer.

Further, in the disposable disposable diaper described in Patent Document 1, when the disposable diaper is installed, the underarm region of the disposable diaper is excessively separated from the wearer's excretion opening.

Therefore, in the disposable disposable diaper described in Patent Document 1, even if the wearer excretes, there is a problem that the indicator cannot be notified of the possibility of replacement of the discarded disposable diaper after use. .

For example, in the disposable diaper described in Patent Document 1, since the wearer's discharge position does not coincide with the arrangement area of the indicator, it is assumed that although the wearer has excreted, the indicator is not reacted (discoloration). The situation.

Specifically, since the installation position of the disposable disposable diaper is shifted from the correct position to the left-right direction, it is assumed that the excretion liquid is absorbed at the end portion of the absorbent body in the width direction of the product, but is provided in the product. The indicator in the center of the width direction does not change color.

Moreover, since the underarm area of the disposable disposable diaper and the discharge opening of the wearer are separated, the wearer is excreted in a posture of sleeping on his back. In other cases, the absorbent body in the underarm area does not absorb the excretory fluid, but the absorbent body in the rear waist region absorbs the excretory fluid. As a result, there is a case where the indicator located only on the back side of the wearer is discolored.

In particular, because the wearer wears a jumpsuit, only the open area of the jumpsuit is opened and the indicator is confirmed to judge whether the wearer is excreted. Therefore, only on the back side of the wearer. In the case of discoloration of the indicator, the wearer will consider that the wearer has not excreted.

In the past, the replacement period of the disposable disposable diaper was judged by the experience of wearing the assistant, touching or sniffing the disposable disposable diaper.

However, in recent years, the situation in which the wearer is not accustomed to child-rearing and the child-care time of the wearer is shortened, causing the wearer to judge the replacement period of the disposable diaper after use, and rely heavily on the condition of the indicator. The increase is necessary to make the indicator properly discolored.

Moreover, the cleaning consciousness of the wearer is increasing year by year. If the wearer excretes, the desire of the wearer who wants to replace the disposable disposable diaper is improved, and the deviation of the discoloration of the indicator is promoted. The excessive replacement of disposable diapers.

Accordingly, the present invention has been made in view of such circumstances, and an object of the invention is to provide a disposable disposable diaper which is stable to the wearer and allows the indicator to properly react.

According to a first aspect of the present invention, a disposable disposable diaper has a front waistline region, a rear waistline region, and a crotch region between the front waistline region and the rear waistline region, and is formed with a pair of feet. The opening portion further includes an absorber extending across the crotch region toward the front waist region and the rear waist region, and further having a product longitudinal direction from the front waist region toward the rear waist region and a length direction of the product The orthogonal product width direction is characterized in that the foot elastic member is formed along the foot opening portion so as to extend from the front waist region to the rear waist region from the crotch region; in the front waist region And the rear waistline region extending along the width direction of the product, configured to hold the disposable disposable diaper in a waistline holding portion of the wearer's body; and the center of the underarm region spanning the width direction of the product The stretchable pants stretchable portion formed at a position overlapping the region where the absorbent body is disposed, the pants elastic portion is disposed apart from the waist holding portion and the leg elastic member, and the product is formed in the pants elastic portion. a non-stretchable area is provided on the side of the front waistline region and the side of the rear waistline region in the longitudinal direction, and An indicator extending across the length of the product and extending in the longitudinal direction of the product to form a visual change when contacted with moisture, the change being recognizable from the non-skin abutting side of the disposable diaper .

10‧‧‧Disposable disposable diapers

20‧‧‧ Front waist area

25‧‧‧胯下区域区

30‧‧‧After waist area

35‧‧‧foot opening

40‧‧‧ absorber

40a‧‧‧Absorbent core

40b‧‧‧ core material cladding

50‧‧‧ top sheet

60a‧‧‧back sheet

60‧‧‧Outer sheets

61‧‧‧Sheet

70‧‧‧Fringe

71‧‧‧Flexible components

75‧‧‧foot expansion

80‧‧‧foot folds

81‧‧‧ joint part

82‧‧‧Free end section

90‧‧‧ buckle

95‧‧‧ Target Department

100‧‧‧Waist expansion joint

110, 120‧‧ ‧ gap

115‧‧‧1st recurve

125‧‧‧2nd Recurve

200‧‧‧ Pants Department

200a‧‧‧ Pants expansion joint

600‧‧‧ indicator

Fig. 1 is a developed plan view (skin contact surface side S2) of the disposable diaper after use in the first embodiment of the present invention.

Fig. 2 is a developed plan view of the disposable diaper after use in the first embodiment of the present invention (non-skin contact surface side S1).

Fig. 3 is a cross-sectional view of the disposable disposable diaper of the embodiment taken along the line F1-F1 shown in Figs. 1 and 2;

Fig. 4 is a cross-sectional view showing the disposable disposable diaper of the embodiment taken along the line F1-F1 shown in Figs. 1 and 2;

Fig. 5 is a cross-sectional view showing the disposable disposable diaper of the embodiment taken along the line F2-F2 shown in Fig. 1.

(First embodiment of the present invention)

The disposable disposable diaper 10 according to the first embodiment of the present invention will be described with reference to Figs. 1 to 5 .

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.

Fig. 1 is a developed plan view of the non-skin contact surface side S1 of the disposable disposable diaper 10 after use in the present embodiment, and Fig. 2 is a skin contact surface of the disposable disposable diaper 10 after use in the present embodiment. Viewed by side S2 FIG. 3 and FIG. 4 are cross-sectional views of the disposable disposable diaper 10 of the present embodiment taken along the line F1-F1 shown in FIG. 1, and FIG. 5 is along the F2- shown in FIG. A cross-sectional view of the discarded disposable diaper 10 of the present embodiment of the F2 line.

The expanded plan view shown in Figs. 1 and 2 is such that the elastic member (foot elastic member) 71 of the leg stretch portion 75 and the leg side gather 80 is extended to the top sheet 50 and the side flap of the disposable disposable diaper 10. A state diagram of a state in which no wrinkles are formed in the sheet 70 or the like.

As shown in FIGS. 1 and 2, the disposable disposable diaper 10 of the present embodiment has a front waistline region 20, a crotch region 25, and a rear waistline region 30.

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

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.

Here, the crotch portion 200 is formed in the crotch region 25, and the region closer to the abdomen side of the wearer than the crotch portion 200 is defined as the front waist region 20, and the crotch portion 200 is closer to the back side of the wearer. The area is defined as the back waist area 30.

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

The disposable disposable diaper 10 of the present embodiment 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.

As shown in FIGS. 3 to 5, the absorbent body 40 is composed of an absorbent core material 40a and a core material wrapping layer 40b.

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

The core wrapping layer 40b is a sheet covering the absorbent core 40a. At least part of the skin contact surface side S2 of the core material wrapping layer 40b is composed of various fiber nonwoven fabrics or tissue sheets having liquid permeability.

For example, as a member constituting the core wrapping layer 40b, a hot air fiber nonwoven fabric having a mass of about 10 to 30 g/m ² , a spunbonded nonwoven fabric, an SMS (spunbond-meltblown-spunbond) nonwoven fabric, or a mass of about 10~ may be used. 30 g/m ² tissue sheet.

In addition, as shown in FIG. 3 to FIG. 5, the liquid-permeable top sheet 50 is provided on the surface side (skin contact surface side S2) of the absorber 40, and the back surface of the absorber 40 (non-skin contact) The surface side S1) is provided with a liquid-impermeable back sheet 60a.

Further, as shown in FIG. 3 to FIG. 5, the back side of the back sheet 60a (non-skin contact surface side S1) is provided to span the underarm region 25 On the back side (non-skin contact surface side S1) of the sheet 61, a sheet piece 61 (for example, a film) extending toward the front waistline region 20 and the back waistline region 30 is provided with an exterior sheet 60.

Here, in a region extending across the crotch region 25 and extending toward the front waistline region 20 and the rear waistline region 30, a shape that can be recognized from the non-skin contact surface side S1 of the disposable disposable diaper 10 is provided. This shape is provided on the sheet 61.

Side flaps 70 are provided on both side edges of the absorbent body 40 in the product width direction W. The side panel 70 is composed of one sheet or a nonwoven fabric in which a plurality of sheets or more are stacked.

Further, as shown in FIGS. 1 and 2, a pair of side panels 70 are provided with a buckle 90.

The buckle 90 is configured to extend in the product waist width direction W in the rear waistline region 30, and the disposable disposable diaper 10 is held by the wearer's body by the non-skin contact surface attached to the front waistline region 20. on.

The target portion 95 is disposed on the non-skin contact surface of the front waist region 20, and the pair of buckles 90 are configured to be fixedly attached to the target portion 95.

The disposable disposable diaper 10 of the present embodiment is formed to be formed along the front waistline region 20 and the rear waistline region 30 by the buckle 90, the front waistline region 20 (target portion 95), and the rear waistline region 30. The product width direction W is extended and the disposable disposable diaper 10 is held by the waist circumference holding portion of the wearer's body.

Here, the waistline holding portion of the rear waistline region 30 is a fan extending from the region of the engaging member provided with the buckle tape 90 toward the product width direction W. The waistline holding portion of the front waistline region 20 is a range extending from the region where the target portion 95 is provided toward the product width direction W.

Further, as shown in Fig. 1 and Fig. 2, the disposable disposable diaper 10 of the present embodiment includes a crotch expansion-contraction portion 200a which is formed in the crotch region 25 and which is expandable and contractible.

Specifically, the crotch elasticized portion 200a is formed in the crotch portion 200, and more specifically, in the crotch region 25, across the center in the product width direction, and formed in the absorbent body disposing region in which the absorbent body 40 is disposed. In addition, the structure of the crotch expansion-contraction part 200a is demonstrated in detail later.

Further, as shown in FIG. 1 and FIG. 2, the surface side (the top sheet 50 side) of the absorber 40 is provided with a pair of leg expansion portions which are formed along the foot opening portion 35 and which are at least extendable in the longitudinal direction L of the product. (foot wrinkles) 75.

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

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

In addition, the leg stretchable portion 75 is a portion that can be substantially contracted in the longitudinal direction L of the product by a stretchable sheet or the like, and the portion in which the stretchable sheet is disposed in a state where the contraction force is not exerted is removed. Again, about the foot The structure of the expansion and contraction unit 75 will be described in detail later.

<Foot wrinkles 80>

Further, as shown in FIG. 1, the inside of the pair of leg expansion-contraction parts 75 (the position near the center in the product width direction W) may be provided with one of the leg-side gathers 80 extending in the longitudinal direction L of the product.

The leg gathers 80 are provided at the inner end portion of the side panel 70 in the product width direction W, and are disposed closer to the inner side of the product width direction W 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.

The side panel 70 is folded back toward the top sheet 50 side at the inner end portion in the product width direction W, and is laminated in two layers.

As shown in FIGS. 3 and 4, between the side panels 70 in the stacked state, the elastic members 71 (see FIGS. 3 and 4) are provided in a state of being elongated in the longitudinal direction L of the product. The side flaps 70 and the elastic members 71 form the foot side gathers 80.

The leg side wrinkles 80 have a joint portion 81 joined to the top sheet 50 or the back sheet 60a, and a free end portion 82 in which the elastic member 71 is disposed.

In the free end portion 82, the central portion of the product length direction L including the crotch region 25 is contracted toward the longitudinal direction L of the product by the elastic member 71 to constitute the constricted portion 84.

The foot side wrinkle 80 is worn after disposable disposable diaper 10 At this time, the joint portion 81 is used as the base end portion, and the contracted portion 84 of the free end portion 82 is used as the apex portion to come into contact with the wearer's skin. That is, the joint portion is a base end portion where the foot side stretchable portion stands up.

In addition, the constricted portion 84 is a portion that can be substantially contracted in the longitudinal direction L of the product by the elastic member 71, and the portion in which the elastic member 71 is disposed in a state where the contraction force is not exerted is removed.

In addition, in FIG. 1 and FIG. 2, the joint portion 81 to which the side panel 70 and the top sheet 50 (or the back sheet 60a or the like) are joined is indicated by oblique lines on the leg side wrinkles 80.

A plurality of joint portions 81 are provided, and the first joint portion 81A is disposed closer to the outer side in the longitudinal direction L of the product than the contraction portion 84, and the second joint portion 81B is disposed closer to the outer side in the product width direction W than the contraction portion 84. s position.

Therefore, the foot wrinkles 80 are configured such that the central portion of the product length direction L including the crotch region 25 stands up toward the wearer side.

In the joint portion 81 of the leg gathers 80, the first joint portion 81A disposed closer to the outer side in the longitudinal direction L of the product than the contraction portion 84 is joined to the top sheet 50.

In the joint portion 81 of the leg gathers 80, the second joint portion 81B disposed closer to the outer side in the product width direction W than the contraction portion 84 is disposed in the product width direction W, and is disposed in the crotch stretch portion 200a and the leg stretch portion 75. between.

The second joining portion 81B is joined to the back sheet 60a (and one in the longitudinal direction L of the product) over the entire length of the product longitudinal direction L. Partially joined to the outer sheet 60). Further, the back sheet 60a is disposed between the absorber 40 and the exterior sheet 60, and functions as a leakage preventing sheet.

Further, the joint portion 81 of the foot side gathers 80 can adopt various structures. The joint portion 81 may extend from the crotch region 25 toward the front waist region 20 and the rear waist region 30, for example, in the longitudinal direction L of the product, and the portion joined to the top sheet 50 may also be a relatively absorbent core material. The portion 40a is closer to the outer side in the product width direction W, and is joined to the liquid-impermeable back sheet 60a, the outer sheet 60, and the like, and is formed as a base end portion that stands up.

Further, the leg gathers 80 are disposed in the upright wrinkles which are closer to the inner side in the product width direction W than the leg stretchable portion 75, and are not limited to the above configuration, and the conventional foot gathers 80 may be employed.

<Waist expansion joint (waist wrinkle) 100>

Further, the disposable disposable diaper 10 may be provided with a waist elastic-contracting portion 100 formed in the rear waistline region 30 and capable of expanding and contracting in the product width direction W.

Specifically, the waist elastic-contraction portion 100 is configured to be disposed between the pair of fastening tapes 90 in the product width direction W, and the fastening tapes 90 are contracted in the product width direction W.

In the present embodiment, the waist elastic-contraction portion 100 is constituted by a stretchable sheet. The member constituting the waist elastic-contraction portion 100 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.

Here, by forming the waist elastic-contraction portion 100 with a material having low bending rigidity, the waist elastic-contraction portion 100 is easily bent along the wearer's body, and the waist elastic-contraction portion can be applied without applying a load to the wearer's body. 100 fits along the wearer's body.

Further, by forming the waist elastic-contracting portion 100 with a material having a small neck-reduction ratio, it is possible to suppress the product longitudinal direction L of the disposable diaper 10 after the disposable diaper 10 is stretched in the product width direction W after use. The contraction, in the wearer's waist (west), can prevent the disposable disposable diaper 10 from sliding down toward the underarm side of the wearer.

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 100.

The waist elastic-contraction part 100 is 1.25-2.5 times of the length extended to the non-extension state (natural state), and is followed by the hot-melt adhesive, heat processing, etc., and the exterior sheet 60.

In the present embodiment, the waist elastic-contraction portion 100 is disposed between the exterior sheet 60 and the back sheet 60a. However, the core stretchable portion 100 may be disposed on the core wrap layer 40b and the back sheet 60a (or the outer cover) in a structure in which the core wrapping layer 40b extends to the outer side in the longitudinal direction L of the absorbent core 40a. Between the sheets 60).

The position of the waist stretch unit 100 is not particularly limited. Further, in a region where the absorber 40 is not disposed, the waist stretch unit 100 can be disposed between the side panel 70 and the back sheet 60a (or the exterior sheet 60).

Further, the waist elastic-contraction portion 100 of the present embodiment is configured to expand and contract in the product width direction W, but may be configured to face the product width. Both the direction W and the longitudinal direction L of the product expand and contract.

<Low rigidity region 210 of the absorber 40>

Here, the absorbent body 40 is in the rear waistline region 30, and has a low-rigidity region 210 having a lower basis weight than the other portions of the absorbent body 40 or the absence of the absorbent core material 40a.

Further, the low-rigidity region 210 is formed to extend to the vicinity of the end portion E9 on the side of the waistline region 30 after the longitudinal direction L of the absorbent body 40.

The width of the low rigidity region 210 in the product width direction W is widened toward the end portion E9 on the waist region 30 side after the product longitudinal direction L of the absorber 40.

More specifically, the shape of the low-rigidity region 210 is wedge-shaped in a plan view of the disposable disposable diaper 10.

Further, the absorber 40 has a stretch suppressing region 220 in which the product width direction W is stretched and contracted compared to the region where the other regions are suppressed.

Here, the expansion/contraction suppression region 220 may be formed on the outer side in the product width direction W of the low rigidity region 210 as shown in FIG. 1 .

Further, the boundary between the expansion-contraction suppression region 220 and the low-rigidity region 210 is formed by an arc having a convex shape toward the center of the product width direction W. Moreover, the absorber 40 which is closer to the outer side in the product width direction W than the low-rigidity region 210 is formed into a convex trapezoidal shape toward the end portion E9 on the side of the rear waistline region 30.

According to this structure, it is possible to wear it to the wearer. An image of the shape of the wearer's buttocks.

In particular, in the case where the disposable disposable diaper 10 is a disposable disposable diaper 10, when the disposable disposable diaper 10 is placed under the wearer's body, the absorbent is used. The core material 40a has the above-described shape or the waist elastic-contraction portion 100 of the rear waistline region 30 in the above-described shape, so that the wearing assistant can think of the position where the wearer's buttocks are to be placed, and the disposable disposable diaper 10 can be used. Install it more properly in the right place.

Further, the waist elastic-contracting portion 100 and the absorbent body 40 are configured to overlap at least partially in the plane viewing angle of the disposable disposable diaper 10 after use.

Specifically, the waist elastic-contraction portion 100 is configured to overlap at least a portion of the low-rigidity region 210 in a plan view angle of the disposable disposable diaper 10 after use.

Further, in the present embodiment, the waist elastic-contraction portion 100 is disposed so as to overlap a part of the low-rigidity region 210, but may be disposed so as to overlap the entire low-rigidity region 210.

By forming such a low-rigidity region 210, the expansion and contraction of the waist elastic-contraction portion 100 is not inhibited, and even if the waist elastic-contraction portion 100 contracts, the low-rigidity region 210 is narrow, and the outer side of the product width direction W is absorbed compared to the low-rigidity region 210. Since the spaces of the bodies 40 are narrowed, the absorber 40 is not easily swelled in an inadvertent shape.

Further, when the leakage of the excretion liquid is prevented from being considered, the low rigidity region 210 has a width narrower than the width of the waist elastic portion 100.

Moreover, since the absorber 40 is used by the waist expansion and contraction portion 100 When the width W of the product is contracted in the width direction of the product, and the interval between the absorbent bodies 40 in which the lower rigid region 210 is closer to the outer side in the width direction W of the product is narrowed, the portion near the end portion E9 on the side of the rear waist region 30 is narrower in the low rigidity region 210. The portion near the crotch region 25 is more closely approached to the center in the product width direction W. Therefore, the portion near the end portion E9 on the side of the back waist region 30 and the portion near the crotch region 25 cause shrinkage in the width direction W of the product. The difference in amount causes the rear waist region 30 to stand up.

That is, the disposable disposable diaper 10 is provided with the waist elastic-contracting portion 100 and the wedge-shaped low-rigidity region 210 which can be expanded and contracted in the product width direction W, so that when the disposable diaper 10 is disposed after use It is easy to form a cup shape in which the disposable disposable diaper 10 protrudes toward the non-skin contact surface side S1.

Further, in the present embodiment, since the low-rigidity region 210 does not have the absorbent core member 40a and overlaps the low-rigidity region 210, the waist elastic-contraction portion 100 is present. Therefore, in the low-rigidity region 210, the rear waistline region 30 The portion of the side closer to the end portion E9 is closer to the center in the product width direction W than the end portion of the absorbent core member 40a, so that the erection of the rear waistline region 30 becomes more conspicuous, so that the cup shape can be formed more stably.

In the present embodiment, since the waist elastic-contraction portion 100 is present over the side edge of the absorbent core member 40a in the product width direction W, the disposable disposable diaper 10 can be formed into a cup shape and the length direction of the product. The absorbent core member 40a at the position on the side of the waist region 30 near the end portion E9 on the side of L can be made to actively follow the wearer's body.

Moreover, the waist expansion and contraction portion 100 and the low rigidity region 210 A small portion is present in a region extending from the pair of fastening tapes 90 toward the product width direction W.

Therefore, in a state where the disposable disposable diaper 10 is laid down under the disposable diaper, even if the disposable disposable diaper 10 is attached to the wearer after use, the absorbent core 40a is passed over. The waist elasticized portion 100 existing in the side edge of the product width direction W is also not placed under the wearer's body.

Therefore, by pulling the pair of fastening tapes 90 to extend the side edges of the waist elastic-contracting part 100, it is possible to more reliably and reliably bring the cup-shaped position close to the waist-side side along the wearer's body.

In the present embodiment, the absorbent core member 40a which is closer to the outer side in the product width direction W than the low-rigidity region 210 is formed in a convex shape toward the rear waistline region 30 side. Therefore, as described above, it is easy to form a cup shape in which the disposable disposable diaper 10 protrudes toward the non-skin contact surface side S1, and the surface area of the absorbent core material 40a can be maintained, thereby preventing absorption. The end of the core material 40a produces leakage of excretion liquid.

In the present embodiment, the low-rigidity region 210 is wedge-shaped in the plane of view of the disposable disposable diaper 10, and the boundary between the absorbent core member 40a and the low-rigidity region 210 is formed by convex toward the underarm region 25. The arc is formed. Furthermore, the radius of the arc is 50 mm to 200 mm.

Therefore, the length (width) of the product width direction W of the low-rigidity region 210 (in the natural state) becomes nonlinearly larger as the end portion E9 on the waist region 30 side toward the product longitudinal direction L, and the rear waist region 30 is erected. It is more remarkable, and therefore, the cup shape can be formed more stably.

Further, since the boundary between the absorptive core material 40a and the low-rigidity region 210 is formed by a circular arc which is convex toward the crotch region 25, the rear waistline region 30 becomes rounded by the contraction of the low-rigidity region 210. The cup shape of the arc becomes a shape of the buttocks having an arc along the wearer.

Further, by forming the low-rigidity region 210, the end portion E9 on the rear waistline region 30 side of the absorber 40 is formed in a convex shape toward the left waistline region 30 side on the right and left sides. The shape of the absorbent body 40 is such that the wearer's buttocks can be seated, so that the wearable disposable diaper 10 can be easily fitted to the correct position for the wearer. .

<Bending rigidity of the absorber 40>

The bending rigidity of the present embodiment is measured by the following method in accordance with the rigidity value based on the taper method (JIS P8125).

First, in a state in which the disposable disposable diaper 10 is unfolded, a sample (for example, the absorbent body 40) of a portion to be measured which is rigid in rigidity is taken.

The sample was measured to have a size of 70 mm (length in the product width direction W) × 38 mm (length in the product longitudinal direction L) of the measurement target portion of the bending rigidity. In the case where the sample contains an elastic member, the elastic member is removed in advance. Further, the measurement tester for the rigidity value used was a cone stiffness tester manufactured by Yasuda Seiki Seisakusho Co., Ltd. Further, the number of samples was 10, and each sample was measured, and the average value thereof was defined as a rigidity value.

The order of measurement is as described in the following (a) to (e).

(a) Determine the thickness (A) of the sample taken.

(b) Next, the sample was held in contact with the center of the chuck (lower side) of the testing machine.

(c) The total of the left and right gaps of the support roller and the sample was adjusted to (A) × 0.80 (mm).

(d) Appropriately select the auxiliary weight so that the indicated load scale enters the range of 15 to 85% of the maximum scale.

(e) Rotate the sample in the left and right directions, stop at the point where the 15 degree support scale line coincides with the center scale of the pendulum, and read the scale of the test machine. Set the value on the left side of the scale to (B) and the value on the right side of the scale to (C).

The rigidity value is obtained by the following formula.

Formula: Rigid value (mN.m) = (((B) + (C)) / 2) × (subsidy weight coefficient) × 9.81 × 10 ^-2

In addition, when the width of the test piece was not 38 mm, the conversion of the bending torque of 38 mm in width was performed.

The higher the rigidity value measured as described above, the higher the bending rigidity, and the lower the rigidity value, the lower the bending rigidity.

<Structure of the buckle and the target part>

The buckle 90 is attached to a region of the side panels 70 corresponding to the rear waist region 30.

Specifically, as shown in FIG. 1 , 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 engaging hooks (not shown) as engaging members are 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 W.

The hook sheet 92 is fixed (specifically joined) to the substrate sheet 91.

The joining of the hook sheet 92 and the base sheet 91 is preferably such that the rigidity of the buckle 90 is not necessary. Specifically, the hook sheet 92 and the base sheet 91 are preferably joined by a hot melt adhesive which is applied intermittently in a dot shape, a linear 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 .

The target portion 95 is provided on the non-skin contact surface of the exterior sheet 60 of the front waistline region 20. The target portion 95 is configured to be engageable by the engagement hook of the buckle, and functions as a loop of the hook and loop locking system. As the target portion 95, for example, a hot air non-woven fabric can be used.

For the target portion 95, for example, a fiber nonwoven fabric made of a polyolefin-based thermoplastic synthetic resin fiber or a polyolefin-based thermoplastic synthetic resin film can be used. Further, the ring attached to the target portion 95 can be formed of a polyolefin-based thermoplastic synthetic resin.

Further, as the target portion 95, a non-woven fabric having a high bulkiness, which is a non-woven fabric which is embossed by a part thereof to prevent the surface of the nonwoven fabric from fluffing, may be used.

Moreover, the outer sheet 60 of the disposable disposable diaper 10 can be formed by non-woven fabric, and the pattern of the attachment portion of the display buckle 90 can be printed on the non-skin contact surface of the back sheet 60a or the outer sheet 60, or The patterned sheet is placed on the non-skin contact surface side S1 of the back sheet 60a or the exterior sheet 60, whereby the target portion 95 is formed.

<Foot expansion portion 75>

The leg stretch portion 75 is disposed along the foot opening portion 35 provided outside the absorber 40 in the product width direction W, and is configured to be expandable and contractible in the product longitudinal direction L.

The leg stretch portion 75 has a width direction inner end region 75I located at the innermost side in the product width direction W in the crotch region 25 .

In particular, the foot opening portion 35 and the leg elastic portion 75 extend outward in the product width direction W from the crotch region 25 toward the outer side in the longitudinal direction L of the product.

Further, the inner end region 75I in the width direction of the leg stretchable portion 75 may be continuously disposed in the longitudinal direction L of the product, or may not be continuous in the longitudinal direction L of the product.

In the present embodiment, the position of the foot opening portion 35 in the product width direction W in the innermost region of the crotch region coincides with the width direction inner end region 75I of the leg stretch portion 75, but does not necessarily coincide.

In the present embodiment, the leg stretch portion 75 is formed of a stretchable sheet. For example, as the stretchable sheet, a stretchable film in which a thermoplastic elastomer such as urethane or styrene is melted into a film shape, a stretchable nonwoven fabric composed of stretchable fibers, or a stretchable stretch can be used. The flexible film or the stretchable non-woven fabric is adhered to a composite sheet of a non-stretchable sheet which is partially cut or fragile.

Further, instead of the stretchable sheet, the leg stretchable portion 75 is configured by arranging one or a plurality of linear elastic members having a linear or belt shape composed of polyurethane elastic fibers and natural rubber.

Or for example, the foot stretch portion 75 may be constituted by a predetermined number of elastic members (for example, three elastic members).

The leg expansion and contraction portion 75 is disposed between the side panel 70 and the exterior sheet 60. Alternatively, in a region including the back sheet 60a disposed between the absorber 40 and the exterior sheet 60, the leg stretch portion 75 is disposed between the back sheet 60a and the side sheet 70.

Specifically, the width of the stretchable sheet member (the width of the disposable diaper 10 in the product width direction W in the natural state) is preferably at least 5 mm or more and 45 mm or less in the underarm region 25, and is preferably 12.5 mm or more and 35 mm or less. For better.

In addition, the measurement was carried out by using a spring measuring instrument (belt portion: coated with polyvinyl chloride having glass fibers) manufactured by Shinwa Rules Co., Ltd., along the measurement target portion (10 samples).

Here, the width of the stretchable sheet member is less than 5 mm. In the case where the surface is substantially along the circumference of the wearer, the portion cannot be concentrated, and the effect of reducing the load on the wearer's skin based on the elastic member cannot be produced, and when the stretchable sheet member is When the width is more than 45 mm, the length of the product width direction W of the disposable disposable diaper 10 is excessively wide, and the area along the foot opening portion 35 becomes too wide, making the stretchable sheet easy. Wind up or flip toward the wearer's body side.

The expansion ratio of the leg expansion and contraction portion 75 is preferably 1.5 to 2.2 times. For example, in the present embodiment, the expansion ratio of the leg stretchable portion 75 can be set to 1.8 to 2.0 times.

In addition, the expansion ratio means the degree of expansion and contraction of the leg expansion-contraction part 75 in the expansion-contraction direction (the longitudinal direction L of the product in this embodiment), and is defined as follows.

The expansion ratio = (the length of the expansion and contraction direction of the leg extension portion 75 in the maximum extension state) / (the length of the expansion and contraction direction of the natural expansion portion 75)

In the present specification, the expansion ratio is measured, for example, in the following manner.

First, in the case where the disposable disposable diaper 10 is sealed in a package or the like after use, the disposable disposable diaper 10 is taken out from the package.

Next, the arrangement area of the leg expansion and contraction portion 75 is cut out. At this time, the exterior sheet 60 joined to the leg expansion and contraction portion 75 is also cut out together. Only the elongation of the sample of the leg stretch portion 75 after the cut was measured, and the elongation of the leg stretch portion 75 was measured.

For each sample, at 20 ° C ± 2 ° C, relative humidity 60% ± 5% RH After leaving for 60 minutes, the length of the leg stretch portion 75 was measured along the direction of expansion and contraction. This length is taken as [the length of the leg stretch portion 75 in the natural state].

Secondly, the length of the stretched direction of the desired region in the state (that is, the natural state) and the length of the stretched direction of the desired region when the wrinkle state of the elastic member is not visually recognized can be measured. This length is taken as [the length of the leg stretch portion 75 in the extended state].

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

Moreover, the interval between the inner ends of the right and left pair of leg extending portions 75 in the product width direction W is widened toward the front waistline region 20 from the crotch region 25, and becomes wider toward the rear waistline region 30 from the crotch region 25.

In the case where the disposable disposable diaper 10 is attached to the wearer's body, the foot stretchable portion 75 can be further configured by arranging the foot stretchable portion 75 so that the lower portion of the crotch portion is narrowed toward the front and rear waist circumferences. Along the wearer's body curvature, the foot telescopic portion 75 is ideally stretched to fit around the wearer's foot circumference.

Further, the interval between the end portions of the front waistline region 20 of the left and right pair of leg stretchable portions 75 (D1 in the drawing) is the interval between the ends of the rear waistline region 30 of the pair of right and left leg stretchable portions 75 (D2 in the drawing) narrow.

In addition, the distance between the disposable diaper 10 is increased from the natural state to the product length direction L and the product width direction W, and the wrinkle is maintained. The distance between the inner ends of the product width direction W of 75.

The extension of the skin surface of the wearer's body is particularly large at the buttocks, and is particularly prominent at the outer side in the width direction. Further, the leg expansion and contraction portion 75 is in close contact with the wearer's body. Therefore, by creating D2>D1, even if the wearer's motion is applied to the disposable disposable diaper 10, the wearer's buttocks-side mid-foot stretchable portion 75 can be extended while being in close contact with each other. Even if the amount of change in the extension is large, the leg stretch portion 75 does not protrude. Therefore, the offset of the disposable disposable diaper 10 based on the use of the foot stretch portion 75 can be suppressed.

Further, the interval between the wearer's feet is the narrowest at the lower part of the crotch, and becomes larger as it goes from the lower part of the crotch to the abdomen side or the back side. Since the foot opening portion 35 and the leg expansion portion 75 are formed to extend outward from the crotch region 25 in the product longitudinal direction L and outward in the product width direction W, the foot opening portion 35 can be disposed along the wearer's foot circumference. Since the foot expansion portion 75 can suppress local stress concentration, it can be intimately attached to the wearer with a low elongation, and the burden on the skin can be reduced.

The leg stretchable portion 75 is configured such that the disposable disposable diaper 10 is bent and contracted along the wearer's foot circumference. The end portion of the leg stretch portion 75 in the product longitudinal direction L is disposed so as to be enlarged in the product width direction W, and is disposed in the vicinity of the waistline holding portion. Therefore, the end portion of the leg stretch portion 75 in the longitudinal direction L of the product acts together with the waist holding portion to contract in the product width direction W.

<Pants stretch unit 200a>

Next, the shape of the crotch expansion-contraction portion 200a will be described.

The crotch stretchable portion 200a is configured to maintain a flat shape in a portion of the crotch region 25 when the disposable disposable diaper 10 is attached to the wearer after use, compared to other portions of the absorbent body 40.

Here, the crotch elasticized portion 200a 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 200a 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 stretchable portion 200a, so that the absorbent core member 40a is contracted, and the flat shape is easily maintained compared to the portion where the absorbent core member 40a is not contracted.

Further, the waistline region 20 and the absorbent core member 40a located in the back waistline region 30 before the crotch stretchable portion 200a is closer to the outer side in the longitudinal direction L of the product are not shrunk by the crotch expansion-contraction portion 200a.

Therefore, the crotch elastic-contraction portion 200a of the crotch region 25 of the disposable disposable diaper 10 is maintained in a flat shape by the buckle 90 while being held by the waist and waist of the wearer without excessively adhering. As a result of the body, the crotch expansion-contraction portion 200a can be appropriately disposed along the body.

Further, in the case where the crotch expansion-contraction portion 200a is expandable and contractible along the longitudinal direction L of the product, the front waistline region 20 and the rear waistline region 30 are formed by the crotch The contraction portion of the elasticized portion 200a is easily erected, and when worn, a flat underarm region can be formed along the body in the lower portion of the wearer's crotch.

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

That is, by the contraction of the crotch expansion-contraction portion 200a, the disposable disposable diaper 10 can be stably installed, 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 expansion-contraction portion 200a is configured to be expandable and contractible, one portion of the crotch region 25 of the disposable disposable diaper 10 is contracted to the ready-to-wear side of the disposable disposable diaper 10 (non- The surface of the skin contact surface side S1) is formed with irregularities and wrinkles.

As a result, it is possible to visually recognize the wearer and the tactile sensation, and it is possible to recognize that the crotch portion 200 is clearly present in the disposable diaper 10 after use in the present embodiment.

Further, the crotch expansion-contraction portion 200a may be constituted by a stretchable sheet.

By forming the crotch stretchable portion 200a 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 stretchable film in which a thermoplastic elastomer such as urethane or styrene is melted into a film shape can be used, and stretchable non-woven fabric composed of stretchable fibers can be used. A cloth or a composite sheet of a non-stretchable sheet which is partially cut or fragile is attached to a stretchable film or a stretchable nonwoven fabric.

In addition, in place of the stretchable sheet, the elastically stretchable elastic members composed of a polyurethane elastic fiber, natural rubber, or the like are arranged side by side in parallel to each other to form the crotch elasticized portion 200a.

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 When the main body of the disposable diaper 10 is in a natural state (non-stretched state), it is preferable that the entire edge portion of the absorbent core member 40a in the product width direction W is contracted.

Moreover, in order to shrink the absorbent core material 40a by the crotch expansion-contraction part 200a, it is preferable to make the interval of the elastic members 7 mm or less, and it is more preferable to make it 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 expansion-contraction portion 200a is preferably 1.2 times or more and 1.8 times or less. For example, in the present embodiment, the expansion ratio of the crotch expansion-contraction portion 200a is set to 1.4 times.

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

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

In the present specification, 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 expansion-contraction portion 200a was measured along the expansion and contraction direction. This length is taken as [the length of the crotch expansion-contraction portion 200a in the natural state].

Secondly, the length of the stretched direction of the desired region in the state (that is, the natural state) and the length of the stretched direction of the desired region when the wrinkles generated by the elastic member are not visually recognized are measured. This length is taken as [the length of the crotch expansion-contraction portion 200a in the extended state].

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

By setting the expansion ratio of the crotch expansion-contraction part 200a to 1.2 times or more and 1.8 times or less, it is desirable to follow the expansion and contraction 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 expansion ratio of the crotch expansion-contraction portion 200a is 1.2 or less, the shrinkage of the crotch elastic-contraction portion 200a in the natural state is insufficient, and the disposable cuff-extension portion 200a is not used. The shrinkage of the absorbent body arrangement region of the underarm region 25 of the disposable diaper 10 is small, and The underarm region 25 of the disposable disposable diaper 10 is insufficient in obtaining a flat shape along the body in the crotch region of the wearer's crotch, so that the disposable disposable diaper 10 is easily removed from the wearer's body. Offset.

In addition, when the expansion ratio of the crotch expansion-contraction portion 200a is made larger than 1.8 times, the contraction size of the crotch expansion-contraction portion 200a in the contraction direction becomes excessively large, so that the region where the crotch elastic-contraction portion 200a exists tends to become more along the body. In a more intimate state, the disposable disposable diaper 10 becomes easily deflected toward the underside of the wearer.

Further, the amount of contraction of the crotch stretchable portion 200a 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 amount of shrinkage is such that the length of the wrinkle 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 direction of expansion and contraction "a (mm) The difference between the two 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 200a 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 installation of the disposable diaper 10 to the wearer, the crotch expansion-contraction portion 200a can be easily and desirably along the wearer's body.

Here, when the contraction amount of the crotch stretched portion 200a in the product longitudinal direction L is made larger than 8%, the crotch stretchable portion 200a 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 install the disposable disposable diaper 10 to the wearer The body, or disposable disposable diaper 10, and the wearer's body become excessively adhered in the underarm region 25 and are easily offset.

In addition, when the contraction amount of the crotch stretchable portion 200a in the longitudinal direction L of the product is 2% or less, the effect of the disposable diaper 10 on the wearer's body stretchable portion 200a itself close to the wearer's body is less likely to occur. .

Further, the center O2 of the crotch expansion-contraction portion 200a 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 expansion-contraction portion 200a is disposed so as to straddle the center O1 of the disposable disposable diaper 10 after the product length direction L is used.

Further, the crotch expansion-contraction portion 200a is formed at a position including the center O1 of the disposable diaper 10 after the longitudinal direction L of the product is used.

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 elastic portion 200a 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 protruded than the lower abdomen. Therefore, when the crotch expansion-contraction portion 200a is fitted to the wearer's crotch portion, the ratio is made to be the aforementioned range. For a complex wearer's body shape, the disposable disposable diaper 10 can be more suitably shaped.

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 longitudinal direction L of the product), 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 portion 200 is provided. It is set to 80 mm (the length of the natural state in the product longitudinal direction L), and the rear waistline region 30 is set to 190 mm (the length of the natural state in 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 200a but also the entire product longitudinal direction L of the disposable disposable diaper 10 can be further along the wearer's body.

In other words, according to this configuration, it is possible to more surely determine the position in the front-rear direction of the crotch expansion-contraction portion 200a so that the disposable disposable diaper 10 correctly conforms to the wearer's body and is more reliably realized. The shape of the disposable diaper 10 can be linked to the object of the present invention.

When the crotch expansion-contraction portion 200a is contracted, the state 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 200a, and therefore, the state is different. When the disposable disposable diaper 10 is worn by the wearer, it is easy to attach the crotch elasticized portion 200a to the lower portion of the wearer's crotch.

Further, according to this arrangement, in a state where the portion of the absorbent core member 40a in which the crotch elastic portion 200a is provided is contracted, 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 installed, the crotch stretchable portion 200a 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 fitted in conformity with the lower portion of the wearer's crotch. Assume.

Further, as shown in Fig. 1, the length W5 (natural state) in the product width direction W of the center position O2 of the crotch expansion-contraction portion 200a in the longitudinal direction L of the product may be configured as the end of the crotch expansion-contraction portion 200a in the longitudinal direction L of the product. The length W of the product width direction W6 (natural State) is shorter.

According to this configuration, since the shape viewed from the outer appearance of the crotch expansion-contraction portion 200a is formed in the middle narrow shape like the lower portion of the panties of the female, the disposable diaper 10 is worn by the wearer. When the wearer wears, the pants expansion-contraction part 200a is installed in the lower part of the wearer, and it can visually confirm that the installation position is correct.

Further, when worn, the wearer is reminded that the disposable disposable diaper 10 has the crotch portion 200 after use, and the impression closer to the underpants can be imparted.

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 portion 110 and the notch portion 120 correspond to a low rigidity portion in which the basis weight of the absorbent core member 40a is lower than that 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 lower than the other portions of the absorbent core member 40a.

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 200a.

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 better to separate and continue, especially in the width direction W of the product. Continued as good.

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, so that 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 into a flat "bottom" Standing up and along the arc curve of the wearer's body (abdomen and buttocks), the shape of the disposable disposable diaper 10 can be used 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 edge portion of the front waistline region 20 side of the notch portion 110 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 The center of the arc is located closer to the side of the front waistline region 20 than the edge.

With such a shape, the deformation of the disposable disposable diaper 1 along the circular 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 length of the product of the notch portion 120 The edge portion on the side of the waist region 30 after the degree direction L constitutes the second inversion portion 125.

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

Here, the notch portion 110 and the notch portion 120 are formed to make the first inversion portion 115 and the second inversion portion 125 better.

As a result, the crotch expansion-contraction portion 200a is configured not to operate with the waistline holding portion (that is, the front waistline region 20, the rear waistline region 30, and the buckle 90 which constitute the waistline holding portion).

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 200a 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 expansion-contraction portion 200a is made 10% or less.

In the disposable disposable diaper 10 of the present embodiment, the crotch elasticized portion 200a can be placed 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 200a is disposed apart from the waistline holding portion and the elastic member 71.

In the disposable diaper 10 of the present embodiment, a non-stretchable region is provided on the side of the waist region 20 and the side of the rear waist region 30 before the longitudinal direction L of the crotch expansion-contraction portion 200a.

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 stretchable portion 200a 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 specific length.

For example, the specific length is the length of the absorbent core 40a in the product width direction W in the region where the length in the product width direction of the front waist region 20, the back waist region 30, and the like is long.

The length of the absorbent core member 40a in the product width direction W is shorter than the specific length, and the length of the front waistline region 20 and the back waistline region 30 in the product width direction W is longer than the specific length, and the product length direction L The absorption capacity of the average unit length (for example, every 10 mm) is different, and the absorption capacity of the region having a shorter length than the specific length is small.

Therefore, the region in which the crotch expansion-contraction portion 200a is provided cooperates with the crotch expansion-contraction portion 200a along the wearer's body such that in this region, even if the amount of excretion is small, the indicator 600 is easily discolored to approach the wearer's excretory opening. Therefore, in the case where the amount of absorption is small, the region first becomes a region of discoloration.

Further, in the region where the crotch expansion-contraction portion 200a is provided, wrinkles due to the crotch expansion-contraction portion 200a are generated, so that the first discolored area (the crotch elastic-contraction portion 200a) and the front waistline region 20 and the rear waistline region where the front and rear are present are present. 30, the indicator 600 looks different.

Generally, in the area where the crotch expansion and contraction portion 200a is provided, Since the wrinkles due to the crotch expansion-contraction portion 200a are generated, the wearing assistant differs in the discoloration of the indicator 600 in the region from the non-stretching region.

When considering the above points, according to the above configuration, the wear assistant can use the discoloration of the indicator 600 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 600 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 disposable diaper 10 from being over-replaced, and to notify the replacement time point of the disposable disposable diaper 10 after appropriate use.

In the natural state of the disposable disposable diaper 10, the skin contact surface side and the non-skin contact surface side of the absorbent core member 40a are formed in a concave-convex shape by the contraction of the crotch elastic-contracting portion 200a. Pleat).

Here, compared with the uneven shape (wrinkle) formed on the non-skin contact surface side, the uneven shape (wrinkle) formed on the skin contact side is configured such that the height of the uneven shape is high and the pitch of the uneven shape is large. .

In the skin contact surface side of the absorbent core material 40a, in order to prevent the liquid flow of the excrement, it is necessary to have a high height and a large pitch, and the non-skin contact surface side of the absorbent core material 40a is required. In order to make the identification of the indicator 600 changeable and recognizable, it is preferable to control the height of the concave-convex shape to be low and the pitch to be small.

Therefore, it is necessary to arrange the stretch sheet at the side closer to the non-skin contact surface than the absorbent core 40a, so that it is more resistant than the stretchable sheet. The thickness of the product structure near the skin contact surface side is smaller than the thickness of the product structure closer to the non-skin contact surface side than the stretchable sheet.

<indicator>

As shown in Fig. 2, the disposable diaper 10 after use in the present embodiment is provided with an indicator 600.

Here, the indicator 600 extends across the crotch stretch portion 200a 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, the indicator 600 can be stably placed at a position close to the wearer's drain opening by attaching the crotch expansion-contraction portion 200a along the wearer's body (the crotch portion).

As a result, it is possible to prevent the indicator 600 from shifting to a state of discoloration, and to cause a situation in which the indicator 600 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 200a are close to each other during installation, the discoloration of the first indicator 600 can be stabilized and can be generated in the crotch region 25 of the disposable disposable diaper 10.

As shown in FIG. 2, the indicator 600 may be configured to extend substantially in parallel with the center line O of the product width direction W in a plurality of strips.

In the case where the crotch stretchable portion 200a is formed of a liquid-impermeable stretchable sheet, as shown in FIG. 2, the indicator 600 is disposed on the skin contact surface side S2 of the stretchable sheet.

In the case where the crotch elasticized portion 200a is formed of a liquid permeable stretchable sheet, as shown in FIG. 3, the indicator 600 is disposed on the non-skin contact surface side S1 of the crotch elasticized portion 200a.

Further, the change (discoloration) of the indicator 600 can be recognized from the non-skin contact surface side S1 of the disposable disposable diaper 10.

For example, when the indicator 600 is disposed on the skin contact surface side S2 of the stretchable sheet, the light transmittance of the stretchable sheet is preferably 60% or more and 87% or less.

For example, the method of measuring the light transmittance is performed in accordance with the specifications of JIS-K7105. Here, as the color difference meter, a photometric color difference meter Z-300A of Nippon Denshoku Industries Co., Ltd. can be used.

Specifically, the sheet to be measured taken out from the disposable disposable diaper 10 was sampled to have a width of 5 mm and a length of 5 mm, and the TT value was obtained after holding the turbidity meter. Further, the TT value was recorded as the total light transmittance (%).

Further, the measurement can be carried out in 10 samples, and the average value thereof is taken as the light transmittance (%).

According to this configuration, it is easy for the wearer to recognize the change (discoloration) of the indicator 600 from the non-skin contact surface side S1 of the disposable disposable diaper 10.

Further, the length (width) of the product width direction W of the shortest absorbent core member 40a in the region where the absorbent core member 40a overlaps the crotch elastic portion 200a, and the length (width) of the product width direction W of the crotch stretchable portion 200a. It is 60% or more and 120% or less.

Further, the indicator 600 is configured to extend from the region where the absorbent core member 40a overlaps the crotch elastic portion 200a in the product longitudinal direction L beyond the crotch elastic portion 200a.

According to this configuration, the absorbent core member 40a and the indicator 600 are lifted up along the wearer's body by the crotch expansion-contraction portion 200a, and can be stably installed after being worn along the wearer's body. Disposable disposable diaper 10.

Moreover, at the time of wearing, the absorbent core material 40a is partially shrunk by the shrinkage of the stretchable sheet constituting the crotch elasticized portion 200a, and the non-skin contact surface side (outer side) of the discarded disposable diaper 10 is used. When the portion is viewed, an impression (shape) close to a flat surface can be made, and the indicator 600a disposed in the crotch expansion-contraction portion 200a can be more easily recognized.

In addition, when the length (width) of the product width direction W of the crotch stretchable portion 200a is narrower than the length of the absorbent core member 40a in the product width direction W, it becomes difficult to maintain the crotch stretchable portion 200a flat. Further, the absorbent core member 40a can be lifted up along the wearer's body.

Moreover, when the length (width) of the product width direction W of the crotch stretchable portion 200a is longer than the length of the absorbent core member 40a in the product width direction W, the region where the absorbent core member 40a is not disposed shrinks. The rigidity of the outer side in the product width direction W of the crotch expansion-contraction part 200a becomes high.

Therefore, the crotch expansion-contraction portion 200a is easily hooked to the wearer's large The leg is worn out.

Further, since the crotch expansion-contraction portion 200a is attached in a state where the absorbent core member 40a is not present in a state where it is more contracted, the members are likely to overlap each other, and the crotch stretchable portion 200a is hardened, which impairs wearing comfort.

<Method of Manufacturing disposable disposable diaper 10>

Next, an example of a method of manufacturing the disposable disposable diaper 10 of the present embodiment will be described. Further, in the manufacturing method not described in the embodiment, an existing method may be used. Moreover, the manufacturing method described below is only an example, and the disposable disposable diaper 10 of this embodiment can also be manufactured by another manufacturing method. The manufacturing method of the disposable disposable diaper 10 includes at least a component forming process, a component mounting process, a foot forming process, a crotch stretching process, and a cutting process.

A constituent part forming process is formed to form a component for constituting the disposable disposable diaper 10. Specifically, for example, the absorbent body 40 is formed by laminating an absorbent material.

In the component mounting process, the stretchable sheet constituting the leg stretch portion 75, the mesh material constituting the mesh material of the top sheet 50, the leakage preventing sheet, and the absorber 40 are placed on the mesh material constituting the back sheet 60a. The components of the disposable disposable diaper 10 are constructed.

In the process of forming the foot circumference, the top sheet 50, the outer sheet 60, and the back sheet 60a are cut along the outer end portion of the leg stretch portion 75 in the MD direction. Thereby, the foot opening portion 35 disposed on the wearer's foot circumference is formed.

In the pants stretching process, the sheet forming the crotch stretch unit 200a is conveyed in a non-stretched state (but the tension required for carrying the conveyance is applied), and the two rollers are used to extend (pre-stretch) the speed difference of the rollers to extend .

Then, the sheet is placed in a stretched state on the indexing drum, and then cut into individual lengths of the product by a transfer roller, and the pitch is changed along with the rotation of the transfer roller, and is transferred to the continuous web.

In the cutting process, a continuous body in which the top sheet 50, the back sheet 60a, the absorber 40, and the like are disposed is cut into the size of one product in the MD direction. Thereby, the disposable disposable diaper 10 is manufactured.

According to the disposable disposable diaper 10 of the present embodiment, since the absorbent core member 40a which is contracted by the crotch expansion-contraction portion 200a is maintained flat along the wearer's body, it is less likely to be left and right when installed. Offset, back and forth offset, etc.

Moreover, according to the disposable disposable diaper 10 of the present embodiment, the area in which the crotch expansion-contraction portion 200a is disposed to be flat is not easily bent during installation, so that the indicator 600 can be easily held while being worn. The position that is always easy to see with the helper.

Further, according to the disposable disposable diaper 10 of the present embodiment, since the absorbent core member 40a is shrunk in the region where the crotch elastic portion 200a is disposed, it has a high basis weight and absorbs in comparison with other regions. Since the surface of the body 40 forms gentle unevenness, it is less likely to cause the surface of the excretion liquid to flow and can be stably absorbed.

And, if the disposable diaper is used according to the embodiment 10, in the case where the absorption capacity of the absorber 40 in the region where the crotch expansion-contraction portion 200a is disposed is exceeded, since the indicator 600 of the non-elastic region is discolored, the wearer can grasp the amount of absorption of the excretion liquid. The disposable disposable diaper 10 can be prevented from being replaced, and the disposable disposable diaper 10 can be replaced at an appropriate time.

As described above, the present invention has been described in detail using the above embodiments, but it is to be understood that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented with various modifications and changes without departing from the spirit and scope of the invention. Therefore, the description of the specification is intended to be illustrative, and not to limit the invention.

Further, all the contents of the Japanese Patent Application No. 2012-247936 (filed on Nov. 9, 2012) are hereby incorporated by reference.

[Industry use possibility]

A disposable disposable diaper that stabilizes the wearing action of the wearer and enables the indicator to properly react can be provided.

10‧‧‧Disposable disposable diapers

20‧‧‧ Front waist area

25‧‧‧胯下区域区

30‧‧‧After waist area

35‧‧‧foot opening

40‧‧‧ absorber

70‧‧‧Fringe

71‧‧‧Flexible components

75‧‧‧foot expansion

75I‧‧‧Inside area

80‧‧‧foot folds

81‧‧‧ joint part

81A‧‧‧1st joint

81B‧‧‧2nd joint

82‧‧‧Free end section

84‧‧‧Contraction

90‧‧‧ buckle

91‧‧‧Substrate sheet

92‧‧‧ hook sheet

95‧‧‧ Target Department

100‧‧‧Waist expansion joint

110, 120‧‧ ‧ gap

115‧‧‧1st recurve

125‧‧‧2nd Recurve

200‧‧‧ Pants Department

200a‧‧‧ Pants expansion joint

210‧‧‧Low rigid area

220‧‧‧Stable suppression zone

Claims (7)

The disposable disposable diaper has a front waist region, a rear waist region, and a crotch region between the front waist region and the rear waist region, and is formed with a pair of foot opening portions and is provided to span the armpit region. The absorbent body extending toward 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 product width direction A disposable diaper having a leg elastic member extending from the front waist region to the rear waist region along the crotch region along the foot opening portion, and configured to be in the front waist region and the aforementioned In the rear waist region, extending along the width direction of the product and retaining the disposable disposable diaper on the waist circumference holding portion of the wearer's body; and the retractable crotch expansion and contraction portion in the aforementioned underarm region The center of the product in the width direction is formed at a position overlapping the region where the absorbent body is disposed, and the crotch expansion-contraction portion and the waist circumference are The holding portion and the leg elastic member are provided separately, and a non-stretchable region is provided on the front waistline region side and the rear waistline region side in the product longitudinal direction of the crotch expansion-contraction portion, and the disposable disposable diaper is further provided There is an indicator that is configured to extend toward the length direction of the article across the crotch expansion and contraction portion, and to cause a visual change when it comes into contact with moisture. The change can be recognized from the non-skin contact surface side of the disposable disposable diaper, and the shrinkage amount of the crotch stretchable portion in the longitudinal direction of the product is the length direction of the disposable disposable diaper. 2% or more and 8% or less of the length. The disposable disposable diaper has a front waist region, a rear waist region, and a crotch region between the front waist region and the rear waist region, and is formed with a pair of foot opening portions and is provided to span the armpit region. The absorbent body extending toward 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 product width direction A disposable diaper having a leg elastic member extending from the front waist region to the rear waist region along the crotch region along the foot opening portion, and configured to be in the front waist region and the aforementioned In the rear waist region, extending along the width direction of the product and holding the disposable disposable diaper on the waist circumference holding portion of the wearer's body; the retractable crotch expansion and contraction portion spanning the aforementioned armpit region The center of the product in the width direction is formed at a position overlapping the region where the absorbent body is disposed; in the rear waist region, toward the aforementioned product Extending in the direction of the tape; and disposed in the front waist region non-skin contact surface, is fixedly mounted In the target portion of the buckle, the waist-retaining portion of the back waist region is a range extending from the region where the engaging member is provided in the buckle width toward the product width direction, and the waist-surrounding portion of the front waist region is provided a region in which the region of the target portion extends in the width direction of the product, the crotch expansion-contraction portion being provided separately from the waist-retaining portion and the leg elastic member, and on the front waist region side of the crotch-retracting portion in the longitudinal direction of the product And a non-stretchable region on the side of the rear waistline region, wherein the disposable disposable diaper further includes an indicator configured to extend across the length of the article and extend over the length of the product. A visual change occurs during contact, and the change can be recognized from the non-skin contact surface side of the disposable disposable diaper, and the center of the crotch stretchable portion in the longitudinal direction of the product is more disposable than the aforementioned use. The disposable diaper is disposed at a position closer to the front waistline region side at the center in the longitudinal direction of the product. A disposable diaper according to claim 1 or 2, wherein the absorbent system has an absorbent core material, and the length of the absorbent core member in the width direction of the product is formed from the front waist region toward The crotch region is shortened, and the crotch region is shortened from the rear waist region to the crotch region, and the crotch elastic portion is provided in a region in which the length of the absorbent core in the product width direction is shorter than a specific length. A disposable diaper according to claim 1 or 2, wherein the absorbent system has an absorbent core material, and the stretch ratio of the crotch stretchable portion is 1.2 times or more and 1.8 times or less. In the natural state of the disposable diaper, the skin contact surface side and the non-skin contact surface side of the absorbent core material are formed by the shrinkage of the crotch elastic expansion portion, and the irregular shape is formed. The uneven shape on the side of the skin surface abutting surface is formed so that the uneven shape formed on the abutting side of the skin surface is high in height and large in pitch. A disposable diaper according to claim 1 or 2, wherein a ratio of a length of the product in the longitudinal direction of the back waist region to a length of the front waist region in the longitudinal direction of the product is 1.1 or more, 1.6 the following. A disposable diaper according to claim 1 or 2, wherein the absorbent system has an absorbent core material, and the length of the product in the width direction of the pants elastic portion and the width of the aforementioned absorbent core material The ratio of the length of the direction is 60% or more and 120% or less. A disposable diaper for use in the first or second aspect of the invention, wherein the crotch expansion-contraction portion is constituted by a stretchable sheet member, and is provided closer to the non-skin contact surface side than the indicator; The stretch sheet has a light transmittance of 60% or more and 87% or less.