WO2016063913A1

WO2016063913A1 - Disposable nappy

Info

Publication number: WO2016063913A1
Application number: PCT/JP2015/079700
Authority: WO
Inventors: 山中　康弘; 拓也深山; 坂口　智
Original assignee: ユニ・チャーム株式会社
Priority date: 2014-10-21
Filing date: 2015-10-21
Publication date: 2016-04-28
Also published as: JP2016077751A; JP6339478B2

Abstract

Provided is a tape-type disposable nappy with which waist fitting properties can be improved. This disposable nappy (10) is provided with a waist expansion/contraction part (85) provided between a pair of fastening tapes. The waist expansion/contraction part (85) extends from the centre of the disposable nappy in the width direction towards both outsides in the width direction. The waist expansion/contraction part (85) is provided with: first areas (851); second areas (852) which are positioned further inside in the width direction than the first areas, and which have a different elongation percentage to the first areas; and a third area (853) which is positioned further inside in the width direction than the second areas, and which has a different elongation percentage to the second areas.

Description

Disposable diapers

The present invention relates to disposable diapers.

DESCRIPTION OF RELATED ART Conventionally, the tape-type disposable diaper which maintains the fit property of a wearer's waist circumference well is known. The disposable diaper of Patent Document 1 has an elastic stretchable member that stretches in the width direction around the waist on the back side of the wearer. The elastic stretchable member overlaps the absorbent core and extends outward in the width direction than the absorbent core.

Unexamined-Japanese-Patent No. 10-137292

However, the above-mentioned disposable diaper has the following problems.

When wearing a tape-type disposable diaper, place the wearer's back on the back waist area of the disposable diaper, pull the fastening tape in the back waist area to the front waist area, and place the fastening tape in the front waist area. Fasten to the area. In the disposable diaper of Patent Document 1, the elastic stretchable member is disposed across the absorbent core in the width direction, and in the natural state, the entire elastic stretchable member in the rear waist region shrinks in the widthwise direction. Therefore, in the natural state, the length in the width direction of the rear waist region may not be secured. As a result, when the back of the wearer is placed on the back waist area of the disposable diaper, the length in the width direction of the back waist area becomes too short, and the wearer can be put on the absorbent core There is a possibility that the wearing property may be deteriorated due to the disappearance or the difficulty of grasping the fastening tape.

Then, this invention is made in view of the above-mentioned subject, and an object of the present invention is to provide a disposable diaper of a tape type which can improve fit around the waist while suppressing deterioration of the wearing property. .

A disposable diaper (disposable diaper 10) according to the present disclosure includes a front waist area (front waist area 20), a rear waist area (rear waist area 30), the front waist area and the rear waist area. And a crotch area (crotch area 25) positioned between the front waist area to the back waist area (longitudinal direction L), and a width direction perpendicular to the longitudinal direction (longitudinal direction L) A pair of fastening tapes (fastening tapes 90) extending along the width direction in the rear waist region and secured to the front waist region, and straddling the crotch region An absorbent core (absorbent core 40a) extending toward at least one of the front waist area and the rear waist area, and a waist stretch unit (waist around) disposed between the pair of fastening tapes and extending in the width direction A disposable diaper having an elastic portion 85), wherein the waist The stretchable portion extends from the center in the width direction of the disposable diaper toward both lateral sides in the width direction, and the waist stretchable portion has a first region (first region 851) and a width wider than the first region A second area (second area 852) which is located inward of the direction and has a different extension rate from the first area, and a place which is inside in the width direction than the second area and which has a different extension rate from the second area And a third region (third region 853).

It is an expanded plan view of the disposable diaper concerning this embodiment. FIG. 2 is a cross-sectional view of the disposable diaper taken along line F1-F1 shown in FIG. FIG. 2 is a cross-sectional view of the disposable diaper taken along line F2-F2 shown in FIG. It is a figure which shows typically the mounting | wearing aspect to the wearer of the disposable diaper which concerns on this embodiment. Fig. 4 (a) shows a fastening tape fixed to the front waist area and the wearer is in a lying state, and Fig. 4 (b) a fastening tape fixed to the front waist area and worn The person was awake.

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

Therefore, specific dimensions and the like should be determined in consideration of the following description. In addition, parts having different dimensional relationships and proportions may be included between the drawings.

(1) Overall Schematic Configuration of Disposable Diaper FIG. 1 is a developed plan view of a disposable diaper 10 according to the present embodiment. FIG. 2 is a cross-sectional view of the disposable diaper taken along line F1-F1 shown in FIG. FIG. 3 is a cross-sectional view of the disposable diaper taken along line F2-F2 shown in FIG. The developed view shown in FIG. 1 is a view in which the elastic members of the leg stretch unit 75 and the leg side stretch unit 80 are stretched until the wrinkles such as the top sheet 50 and the side flaps 70 constituting the disposable diaper are not formed. is there.

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

In the disposable diaper 10, a pair of leg openings 35 are formed. The leg opening 35 is provided at the outer edge (outside end in the width direction) of the disposable diaper, and is a portion disposed along the periphery of the wearer's leg when the disposable diaper is worn by the wearer. .

In the present embodiment, the direction from the front waist area 20 to the rear waist area 30 is referred to as the longitudinal direction L, and the direction orthogonal to the longitudinal direction L is referred to as the width direction W.

The disposable diaper 10 has an absorber 40. The absorber 40 has an absorbent core 40 a and a core wrap 40 b. The absorbent core 40 a straddles the crotch region 25 and extends from the crotch region 25 toward at least one of the front waist region 20 and the back waist region 30.

The absorbent core 40a is the same as that of a conventional disposable diaper, and can be appropriately configured using known members and materials such as ground pulp and a high absorption polymer. The absorbent core 40a is wrapped by a sheet-like core wrap 40b. The core wrap 40b is a sheet that covers the absorbent core 40a. The rear end edge of the absorbent core and the rear end edge of the core wrap substantially coincide with each other. More specifically, the distance between the rear end edge of the absorbent core and the rear end edge of the core wrap is 5 mm or less.

In the absorbent core 40a, a low basis weight region 110 in which the basis weight of the absorbent material is lower than that of other portions of the absorbent core 40a is formed. The low basis weight region 110 is located at the center in the width direction of the rear end edge of the absorbent core 40a. The width of the low basis weight region 110 in the width direction W becomes wider toward the rear end edge of the absorbent core 40a. More specifically, the low basis weight region 110 is wedge-shaped in plan view of the disposable diaper 10.

A liquid permeable top sheet 50 is provided on the surface side (skin facing surface side) of the absorber 40. In addition, on the back surface side (non-skin facing surface side) of the absorber 40, a liquid impermeable back sheet 60a is provided. An exterior sheet 60 is provided on the back side of the back sheet 60a.

Side flaps 70 are provided on the outer edge of the absorbent body 40, respectively. The side flaps 70 are disposed across the front waist area 20, the crotch area 25, and the rear waist area 30 and outside the absorber 40 in the width direction. The side flaps 70 are formed of one or two or more plural non-woven fabrics. The side flaps 70 are positioned closer to the skin facing surface than the absorbent core, and extend outward in the width direction than the absorbent core. The inner edge of the side flaps (the inner edge in the width direction) covers the absorbent core, and the outer edge of the side flaps is disposed in the width direction outside the absorbent core.

The side flap 70 is provided with a pair of leg extension parts 75 which are disposed inward in the width direction than the leg openings 35 and can extend and contract in the longitudinal direction L. The leg stretch unit 75 may be configured to be able to extend and contract the leg opening 35 in the longitudinal direction, and may be disposed along the leg opening 35, and a part of the leg stretchable unit 75 relative to the leg opening 35 You may arrange | position in the inclined state.

Further, a pair of leg side stretchable portions 80 extending along the longitudinal direction L is provided on the inner side in the width direction of the pair of leg stretchable portions 75. The leg side stretchable portion 80 is provided at the inner end in the width direction of the side flap 70, and is a standing stretchable gather.

In addition, the disposable diaper 10 includes the crotch stretch unit 200 disposed in a region overlapping the absorber in the crotch region 25. The crotch stretch unit 200 is configured to be able to maintain a flat shape in a part of the crotch region 25 when the disposable diaper is worn, as compared with other parts of the absorbent body 40. The crotch stretch unit 200 is configured to be stretchable in at least the longitudinal direction L or the width direction W.

The first notch 115 and the second notch 125 are formed in the absorbent core 40a in the crotch region. The first notch 115 and the second notch 125 are slits formed in the absorber 40. The slit is a portion where no absorbent material is present. The first notch 115 and the second notch 125 respectively have a notch shape extending inward in the width direction from the outer edge of the absorbent core 40a. The disposable diaper may not have the crotch stretch unit 200, the first notch 115, and the second notch 125.

The fastening tape 90 is a pair, extends along the width direction W in the rear waist region 30, and is fixed to the non-skin facing surface of the front waist region 20, thereby allowing the disposable diaper 10 to be worn by the wearer. Hold on to the body. The fastening tape 90 is attached to the area of the side flap 70 corresponding to the back waist area 30. The fastening tape 90 includes a base sheet 91 connected to the side flaps 70, and a hook sheet 92 provided with engaging hooks (not shown) as a plurality of engaging members and fixed to the base sheet 91. Equipped with The hook sheet 92 is an area in which the engagement member is provided.

The target portion 95 is provided on the non-skin facing surface of the exterior sheet 60 in the front waist region. The target portion 95 is configured such that the fastening hook of the fastening tape is hooked, and functions as a loop of the hook and loop locking system. For example, an air through non-woven fabric can be used as the target portion. The disposable diaper may be configured such that the fastening tape 90 is fastened to the exterior sheet 60 in the front waist area without having the target portion.

In addition, an elastic waist portion 85 that can expand and contract in the width direction is provided between the pair of fastening tapes 90 in the width direction. The waist elastics 85 contract in the width direction between the fastening tapes 90.

In the present embodiment, the waist elastic section 85 is made of an elastic sheet. The waist elastic portion 85 is a portion that expands and contracts substantially in the width direction, and is a concept excluding the portion where the elastic sheet is disposed in a state where the expansion force is not exerted. Therefore, the outer edge of the waist elastic section described later is not the outer edge of the stretchable sheet, but the outer edge of the stretchable portion. In the present embodiment, an elastic film with a basis weight of 20 to 45 g / m ² is used as the waist elastic section 85. However, the waist elastic unit 85 may be configured with another configuration such as a plurality of thread rubbers. The waist elastic section 85 is stretched to a predetermined magnification with respect to the length in the non-stretched state (natural state), and then adhered to the exterior sheet 60 by a hot melt adhesive or heat treatment or the like.

The waist elastic section 85 extends from the center in the width direction of the disposable diaper toward both sides in the width direction, and is constituted by a continuous sheet extending in the width direction. The rear end edge of the waist elastic portion 85 is located forward of the rear end edge of the disposable diaper. The rear end edge of the waist elastic portion 85 may coincide with the rear end edge of the disposable diaper. Further, the front end edge of the waist elastic portion 85 is located forward of the rear end edge of the absorbent core 40 a and forward of the rear end edge of the core wrap 40 b and rearward of the rear end edge of the leg elastic portion 75. . Therefore, at least a part of the waist elastic section 85 overlaps the absorbent core 40a in plan view of the disposable diaper. The waist elastic portion 85 straddles the rear end edge of the absorbent core and the rear end edge of the core wrap, and extends rearward of the rear end edge of the absorbent core and the rear end edge of the core wrap.

The outer edge 85WO of the waist elastic portion 85 is positioned inward in the width direction than the inner edge (inward end in the width direction) of the fastening tape. The waist elastic portion 85 and the fastening tape 90 are separated in the width direction.

The waist elastic portion 85 includes a first area 851, a second area 852 located inward of the first area 851 in the width direction, and a third area located inward of the second area 852 in the width direction. Have. In the present embodiment, the first region 851 extends inward in the width direction from both outer edges 85WO of the waist elastic portion. In addition, the second region 852 extends inward in the width direction from the inner edge 851 WI of the first region 851. In addition, the third region 853 extends inward in the width direction from the inner edge 852WI of the second region 852.

That is, the first area 851, the second area 852, and the third area 853 of the present embodiment are continuous in the width direction. Therefore, non-stretchable regions that do not stretch in the width direction are not provided between the first region 851 and the second region 852 and between the second region 852 and the third region 853. Also, the inner edge 851WI of the first region 851 coincides with the outer edge 852WO of the second region 852 and the inner edge 852WI of the second region 852 coincides with the outer edge 853WO of the third region 853.

However, in another embodiment, the first area 851, the second area 852, and the third area 853 may not be continuous in the width direction. That is, non-stretchable regions that do not stretch in the width direction may be provided between the first region 851 and the second region 852 and between the second region 852 and the third region 853.

The first region 851, the second region 852, and the third region 853 are configured such that the extension ratio in the width direction is different from that of the adjacent region. The extension ratio of the first region 851 is different from the extension ratio of the second region 852. Further, the extension ratio of the second region 852 is different from the extension ratio of the third region 853. Thus, the waist elastic portion 85 has four boundaries at which the expansion rate changes. Specifically, the extension ratio in the width direction of the second region 852 is lower than the extension ratio in the width direction of the first region 851. Further, the expansion ratio in the width direction of the third region 853 is higher than the expansion ratio in the width direction of the second region 852. Further, the relationship between the extension ratio in the width direction of the first region 851 and the extension ratio in the width direction of the third region 853 may be the same, or may be higher. Preferably, the extension ratio in the width direction of the third region 853 is higher than the extension ratio in the width direction of the first region 851. In another embodiment, the extension ratio in the width direction of the second region 852 may be higher than the extension ratio in the width direction of the first region 851, and may be higher than the extension ratio in the width direction of the third region 853. .

The outer edge 851WO of the first region 851 is located outside in the width direction than the outer edge of the absorbent core 40a. The inner edge 851 WI of the first region 851 is located inward in the width direction than the outer edge of the absorbent core. Thus, the first region is disposed across the outer edge of the absorbent core. Note that at least a part of the first region may be located outside in the width direction of the absorbent core, and the inner edge of the first region may be located outside in the width direction than the outer edge of the absorbent core, The inner edge of the first region may coincide with the outer edge of the absorbent core.

The second area 852 is located between the first area 851 and the third area 853. In addition, at least a part of the first region 851, the second region 852, and the third region 853 having the lowest extension ratio is disposed inward in the width direction than the outer edge of the absorbent core 40a. preferable. Specifically, of the first area 851, the second area 852, and the third area 853, the second area 852 having the lowest expansion rate is disposed inward in the width direction than the outer edge of the absorbent core 40a. Is preferred. The third region 853 is disposed across the center of the disposable diaper in the width direction. The third region 853 preferably overlaps at least a part of the low basis weight region in plan view.

The waist elastic section 85 of the present embodiment may be symmetrical or asymmetrical with respect to a center line extending through the widthwise center of the disposable diaper and extending in the longitudinal direction. For example, both the left and right first regions 851 may straddle the outer edge of the absorbent core 40a, or one first region 851 may straddle the outer edge of the absorbent core 40a. . Also, both of the left and right second regions 852 may be disposed inward in the width direction than the outer edge of the absorbent core 40a, and one second region 852 is wider than the outer edge of the absorbent core 40a. It may be arranged inside the direction. Further, in the disposable diaper of the present embodiment, a region having an elongation rate lower than that of the first region 851 may be provided on the outer side in the width direction than the first region 851.

The waist elastic portion 85 is positioned closer to the non-skin facing surface than the absorbent core 40a. In the present embodiment, the waist elastic section 85 is disposed between the exterior sheet 60 and the back sheet 60a. However, in the configuration in which the core wrap 40b extends outward in the longitudinal direction than the absorbent core 40a, the waist elastic section 85 is disposed between the core wrap 40b and the back sheet 60a or the exterior sheet 60. May be The position of the waist elastic portion is not particularly limited. Moreover, in the area | region where an absorber is not arrange | positioned, you may arrange | position between the side flap 70, and the back sheet 60a or the exterior sheet 60. FIG.

Although the waist stretch unit according to the present embodiment is configured to stretch in the width direction, the waist stretch unit may be configured to stretch in the width direction and the longitudinal direction.

In addition, the waist elastic portion and the absorbent core are joined via an adhesive. The adhesive for bonding the waist elastic portion 85 and the absorbent core 40a is disposed in a plurality of rows continuously in the longitudinal direction, and the rows are disposed so as to overlap in the width direction. Specifically, the adhesive has a configuration in which a plurality of spiral shapes continuous in the longitudinal direction are arranged, and the rows overlap in the width direction, or are oscillated in the width direction, and a plurality of wave shapes continuous in the longitudinal direction are arranged And the row may overlap in the width direction.

In the present embodiment, the waist elastic portion 85 and the absorbent core 40a are not directly joined but indirectly joined via the back sheet 60a and the core wrap 40b. The adhesive for bonding the waist elastic portion 85 and the back sheet 60a, the adhesive for bonding the back sheet 60a and the core wrap 40b, and the adhesive for bonding the core wrap 40b and the absorbent core 40a are continuous in the longitudinal direction. It is preferable to arrange in a plurality of rows, and to arrange each row so as to overlap in the width direction.

The term "elongation rate" as used herein means the degree of elongation, and shall be performed by the following measurement method.

When the disposable diaper 10 is enclosed in a package or the like, the disposable diaper 10 is removed from the package. Subsequently, the arrangement | positioning area | region of the elastic sheet which comprises a waist elastic part is cut out, and the sample of a measuring object is prepared. The sample is left in an atmosphere of 20 ° C. ± 2 ° C. and relative humidity 60% ± 5% RH for 24 hours to make this state the natural state of the elastic sheet. In the natural state, between the end (front end) on the absorbent core side of the stretchable sheet and the end (rear end) on the waist opening side of the stretchable sheet, ie, at the middle position in the longitudinal direction, Intermittent points (marks) along the width direction. The said point attaches a point (mark) to the sample width direction end of an elastic sheet at intervals of 5 mm from the said reference on the basis of the center of the elastic sheet in the width direction. Measure the distance between adjacent points. Let this distance be the length of the natural state. (Because it is marked at 5 mm intervals, it will be 5 mm). Next, the distance between the above marks is measured when it is stretched from the natural state to a state where the wrinkles by the elastic member can not be visually confirmed. The elongation rate is calculated by the equation of elongation rate of each part (double) = (distance between marks in stretched state) / (distance between marks in natural state).

(2) Manufacturing method of disposable diaper Next, an example of the manufacturing method of the absorptive article concerning this embodiment is explained. In addition, the existing method can be used about the method which is not demonstrated in this embodiment. Moreover, the manufacturing method demonstrated below is an example, and can also be manufactured by another manufacturing method. The method of manufacturing the absorbent article includes at least a component forming step, a component placing step, a leg surrounding forming step, and a cutting step.

In the component forming step, components constituting the absorbent article are formed. Specifically, for example, the absorbent material is laminated to form the absorbent body 40, or the fastening tape 90 is formed.

In the component placement step, on the web constituting the back sheet, an elastic sheet constituting the waist elastic section 85, another web such as the web constituting the top sheet, a leak-proof sheet, an absorber, leg elastic The component which comprises disposable diapers 10, such as part 75 grade, is laid.

In addition, as a method of changing the extension rate of the waist elastic part 85, the following method is mentioned, for example. Before attaching the waist stretch unit 85 to the back sheet 60a or the like, the waist stretch unit 85 is stretched by a gear in the width direction. When extending by the gear, the gear extension of the region (e.g., the second region) where the extension rate is low is weakened. Intensify the gear extension of the region (e.g., the first region and the third region) where the elongation rate is to be increased. The strength of the gear drawing can be adjusted by changing the depth of the convex part of the gear, the pitch of the convex part of the gear, and the number of times of the gear drawing. The elongation of the strongly drawn regions is relatively high, and the elongation of the weakly drawn regions is relatively low.

The leg forming process cuts the top sheet 50, the exterior sheet 60, and the back sheet 60a. This forms a leg opening 35 which is arranged around the leg of the wearer.

In the cutting step, the continuous body on which the top sheet 50, the back sheet 60a, the absorber 40, and the like are arranged is cut along the width direction W into one product. Thereby, disposable diaper 10 is manufactured.

(3) Operation and Effect The waist elastic section 85 of the disposable diaper has a first area 851, a second area 852 and a third area 853 which have different elongation rates. The first area 851, the second area 852, and the third area 853 which have different elongation rates provide a strong fit area and a weak fit area, and the areas fit together so that they fit around the waist of the wearer. And fit can be enhanced.

When wearing a tape type disposable diaper (when fastening the fastening tape), place the wearer's back on the back waist area of the disposable diaper, and use the fastening tape 90 of the back waist area 30 as the front waist area It pulls to 20 and fastens the fastening tape 90 to the front waist area 20. In FIG. 4, the mounting aspect to the wearer of a disposable diaper is shown typically. Fig. 4 (a) shows a state in which the fastening tape is fastened to the front waist area with the wearer's back placed on the back waist area of the disposable diaper, and the wearer sleeps. In (b), the fastening tape 90 is fastened to the front waist area and the wearer is awake.

When trying to improve the fit, it is conceivable to increase the stretch rate of the waist elastic part as a whole. However, if the extension ratio of the waist elastic portion is increased overall, the width of the back waist region in the natural state may be too short. As a result, the width of the disposable diaper can not be secured at the time of wearing, which makes it difficult for the wearing assistant to grasp the fastening tape 90, which may deteriorate the wearing property. However, by alternately providing the regions having different extension rates, the fit can be enhanced without uniformly increasing the extension rate of the entire waist elastic part.

The first area 851, the second area 852 and the third area 853 are continuous in the width direction. By the respective regions being continuous in the width direction, the respective regions expand and contract in conjunction with each other. Therefore, the fit can be secured in the region where the elongation rate is relatively high, and the width of the rear waist region can be secured in the region where the elongation rate is relatively low. The fit around the waist can be enhanced while suppressing the deterioration of the fittability.

Of the first area 851, the second area 852 and the third area 853, at least a part of the second area 852 having the lowest expansion rate is located inward in the width direction than the outer edge of the absorbent core 40a. For example, when the third region 853 is disposed in the entire width direction of the absorbent core 40a, the width of the absorbent core 40a may be too short in the natural state due to the contraction of the third region 853. As a result, the width of the disposable diaper can not be secured at the time of fastening of the fastening tape, and it becomes difficult for the wearing assistant to grasp the fastening tape 90, and there is a possibility that the wearability may be deteriorated. However, the second region 852 and the third region 853 are all over the width direction of the absorbent core 40a by locating the second region 852 having the lowest expansion rate inside the width direction of the outer edge of the absorbent core 40a. Be placed. Therefore, the width of the absorbent core 40a does not become too short in the natural state, and deterioration of the mounting property can be suppressed.

As shown to Fig.4 (a), a body pressure of a wearer applies to the back waist area 30 of a disposable diaper at the time of fastening of a fastening tape. Generally, the wearer's body is placed so as to cover the full width of the absorbent core 40a when worn. Therefore, when pulling the fastening tape 90, the part located in the width direction outer side rather than a wearer's body, ie, the area | region of the width direction outer side rather than the absorption core 40a, is pulled. For example, if the part pulling the fastening tape 90 is difficult to stretch, the mounting assistant may not know how long the fastening tape 90 may be stretched and may not be able to fasten at the correct position. However, since the first area 851 having a relatively high expansion rate is disposed on the outer side in the width direction than the absorbent core 40a, the wearing assistant stretches the first area 851 and fixes the fastening tape 90. . Since the wearing assistant easily extends the first region 851, the wearing assistant can easily grasp the range in which the first region 851 can be extended. Therefore, the mounting assistant can grasp the range in which the fastening tape 90 is stretched and fasten the fastening tape at the correct position.

In addition, when fastening the fastening tape 90, the first region 851 is disposed at a position to hit the hip bone beside the wearer. On the other hand, when fastening the fastening tape 90, the second region 852 and the third region 853 are in a state in which the physical pressure of the wearer is applied and it is difficult to expand and contract. However, after the disposable diaper is worn on the wearer, for example, when the wearer is woken up, the body pressure applied to the rear waist region 30 of the disposable diaper is reduced. When the body pressure of the wearer applied to the back waist region 30 is reduced, as shown in FIG. 4B, the first area 851, the second area 852 and the third area 853 interlock to set the first area 851 as a base point. The second region 852 and the third region 853 expand and contract as

Specifically, the first area 851 is already stretched when the fastening tape is attached, as compared to the second area 852 and the third area 853. The extension ratio of the second region 852 is lower than the extension ratio of the first region 851 and lower than the extension ratio of the third region 853. In this state, when the second area 852 and the third area 853 respectively expand and contract, the second area 852 having a relatively low expansion rate relative to the first area 851 is pulled toward the first area 851 and the expansion rate is relatively increased. The third region 853 having a high height pulls the second region 852 inward in the width direction, and the second region 852 extends. At this time, since the first area 851 is located closer to the fastening tape, it extends when the fastening tape 90 is attached to the target portion 95. At that time, the third region 853 which is difficult to extend in the width direction than the second region 852 makes the second region 852 located between the first region 851 and the third region 853 uniform in the width direction. As a result, the second region 852 can be evenly fitted to the body without weakening the baby's body.

By fitting the disposable diaper in this manner, the waist bone of the wearer is strongly fitted by the first region 851. Also, the dorsal side of the wearer's side lower than the hip bone has less hip bone, and the wearer's body is relatively soft. The portion with less hip bone is weakly fitted by the second region 852. The fit of the wearer's body is relatively strong, and the fit of the wearer's body is soft, so that the fit of the wearer's body is fit to enhance the fit around the waist. it can. In other words, the mother (helper) originally desires "I do not want to tighten the baby with a diaper", and on the other hand, to create a gap between the body and not leak the excrement, improve the fit (tighten strongly To achieve each other's contradiction to one another by the constitution of the present invention.

The absorbent core 40a is relatively stiffer than the other members (top sheet 50) that make up the disposable diaper, so it is difficult to be disposed along the body. However, since at least a part of the waist stretch unit 85 overlaps the absorbent core 40 a and the waist stretch unit 85 is disposed on the non-skin facing surface side of the absorbent core 40 a, the waist stretch unit 85 absorbs the contraction The core 40a can be fitted to the body.

The third region 853 is disposed across the center of the disposable diaper 10 in the width direction. The spine is placed at the center of the wearer's back, and is concaved to the ventral side relative to the left and right regions. The recess (the diamond of Michael) is a recess of the sacrum portion, and the third region 853 is disposed at the recess. In FIG. 4 (a), the recessed part CR is shown. After wearing the disposable diaper, the third region 853 contracts while pulling the second region 852 when the body pressure decreases. The contracted portion can be placed at the recessed area of the wearer. Therefore, it can suppress that a crevice arises between the center of a wearer's back, and a disposable diaper, and can fit disposable diaper 10 over the waist circumference. In addition, since the thickness difference of the absorbent core 40a is generated before and after the rear end edge of the absorbent core 40a, a gap is likely to occur between the body and the disposable diaper. However, since the rear end edge of the waist elastic section 85 extends to the waist side beyond the rear end edge of the absorbent core 40a, and the extension ratio of the third region 853 is relatively high, Can be prevented more reliably.

The inner edge of the first region 851 is located inward in the width direction than the outer edge of the absorbent core 40a. When pulling and mounting the fastening tape, the mounting assistant stretches the first area and fastens the fastening tape. Also, when stretching the first area and fastening the fastening tape, the absorbent core is placed under the wearer's body and is under pressure. Because the inner edge of the first region is disposed inward in the width direction than the outer edge of the absorbent core, the inner edge of the absorbent core moves under the wearer's body when pulling on the fastening tape It is a difficult condition. Therefore, when the inner edge of the first region 851 is positioned inward in the width direction than the outer edge of the absorbent core 40a, when the fastening tape is pulled, the inner edge of the first region 851 becomes a base point and the first region It becomes easy to stretch 81.

The extension ratio of the third region 853 in the width direction may be higher than the extension ratio of the first region 851 in the width direction. Since the extension ratio of the third region 853 is higher than the extension ratio of the first region 851, after fastening the fastening tape, the body pressure applied to the rear waist region is reduced, the third region The second region 852 is pulled to the 853 side. Thus, it is possible to collect a portion contracted by the third region in the recess of the wearer's back.

The third region 853 overlaps at least a part of the low basis weight region in plan view. The lower area is shrunk in the width direction by the third area, and the rear end edge of the absorbent core is deformed toward the center in the width direction. The back of the absorbent core can be cup-shaped. The cup-shaped absorbent core can cover the buttocks of the wearer and can further enhance the waist fit.

Moreover, the waist elastic section 85 is not disposed at the rear end edge of the disposable diaper, and the side flaps of the rear end edge of the disposable diaper have notches which are recessed inward in the width direction and inward in the longitudinal direction. It is done. More specifically, the rear end edge of the side flap is recessed longitudinally inward in a range extending inward in the width direction from the outer edge of the side flap. In other words, the outer edge of the side flap is recessed inwardly in the width direction in a range extending longitudinally inward from the rear end edge of the side flap. Thus, by comprising the back end edge of a disposable diaper, it is possible to suppress turning at the back end edge of the disposable diaper, and it is possible to more reliably cover the waist area of the wearer.

As described above, although the contents of the present invention have been disclosed through the embodiments of the present invention, it should not be understood that the descriptions and the drawings that form a part of this disclosure limit the present invention. Various alternative embodiments, examples and operation techniques will be apparent to those skilled in the art from this disclosure. Accordingly, the technical scope of the present invention is defined only by the invention-specifying matters according to the claims that are appropriate from the above description.

The entire content of Japanese Patent Application No. 2014-214866, filed on October 21, 2014, as the basis for claiming priority of the present application is incorporated herein by reference.

ADVANTAGE OF THE INVENTION According to this invention, the tape-type disposable diaper which can improve the fit around a waist can be provided, suppressing a deterioration of mounting property.

DESCRIPTION OF SYMBOLS 10 ... Disposable diaper 20 ... Front waist area 25 ... Crotch area 30 ... Back waist area 35 ... Leg opening 40 ... Absorbent body 40a ... Absorbent core 40b ... Coating sheet 50 ... Top sheet 60 ... Exterior sheet 60a ... Back sheet 70 ... side flap 75 ... leg elastic section 80 ... leg side elastic section 85 ... waist elastic section 851 ... first area 852 ... second area 853 ... third area 90 ... fastening tape 110 ... low basis area 115 ... first cut Notch 125 ... 2nd notch 200 ... Crotch expansion and contraction part L ... Longitudinal direction W ... Width direction

Claims

A front waist region, a back waist region, and a crotch region located between the front waist region and the back waist region;
A longitudinal direction from the front waist region to the back waist region, and a width direction orthogonal to the longitudinal direction;
A pair of fastening tapes that extend along the width direction in the rear waist region and are attached to the front waist region;
An absorbent core extending across the crotch region toward at least one of the front waist region and the back waist region;
It is a disposable diaper which is disposed between the pair of fastening tapes and has a waist elastic section which expands and contracts in the width direction,
The waist elastic section extends from the center in the width direction of the disposable diaper toward both sides in the width direction.
The waist elastic section is located inward in the width direction from the first area and the first area, and has a second area different in extension ratio from the first area, and inward in the width direction from the second area. And a third region located at the second region and different in extension rate from the second region.
The first area extends inward in the width direction from both outer edges of the waist elastic section.
The second region extends inward in the width direction from the inner edge of the first region,
The disposable diaper according to claim 1, wherein the third area extends inward in the width direction from an inner edge of the second area.
The at least one portion of the first region, the second region, and the third region, which has the lowest extension ratio, is positioned inward in the width direction of the outer edge of the absorbent core. Disposable diapers described in.
The disposable diaper according to any one of claims 1 to 3, wherein the elongation of the second region is lower than the elongation of the first region and lower than the elongation of the third region.
At least a portion of the waist elastic section overlaps the absorbent core in plan view of the disposable diaper,
The disposable diaper according to any one of claims 1 to 4, wherein the waist elastic section is positioned closer to the non-skin facing surface than the absorbent core.
The outer edge of the first region is located outside in the width direction than the outer edge of the absorbent core,
The disposable diaper according to any one of claims 1 to 5, wherein the inner edge of the first area is located inward in the width direction than the outer edge of the absorbent core.
The third region is disposed across the center of the disposable diaper in the width direction,
The disposable diaper according to any one of claims 1 to 6, wherein the extension ratio in the width direction of the third region is higher than the extension ratio in the width direction of the first region.
At the center in the width direction of the rear end edge of the absorbent core, a low-weighted area in which the absorbent material has a lower fabric weight than the other parts of the absorbent core is formed;
The disposable diaper according to any one of claims 1 to 7, wherein the third region overlaps at least a part of the low basis weight region in a plan view.
It has a side flap located on the skin-facing surface side of the absorbent core and extending outward in the width direction of the absorbent core,
The disposable according to any one of claims 1 to 8, wherein the rear end edge of the side flap is recessed in the longitudinal direction in a range extending inward in the width direction from the outer edge of the side flap. Diapers.