JP5255150B1 - Disposable diapers - Google Patents

Abstract

An object of the present invention is to stabilize wearing on a wearer and to appropriately react an indicator.
In a disposable diaper according to the present invention, a crotch stretchable part 200a is provided apart from a waistline holding part and a leg elastic member 71, and a front waistline region 20 in a product longitudinal direction L of the crotch stretchable part 200a. A non-stretchable region is provided on the side and rear waistline region 30 side, an indicator 600 configured to extend in the product longitudinal direction L across the crotch stretchable portion 200a and visually change when it comes into contact with moisture. This change is visible from the non-skin contact surface side S <b> 1 of the disposable diaper 10.
[Selection] Figure 2

Description

  The present invention relates to a disposable diaper.

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

  Here, in such a disposable diaper, in order to inform the wearer of the replacement time of the disposable diaper, Patent Document 1 describes a crotch region using a hydrophilic agent that visually changes when contacted with moisture as an indicator. The technology provided in is disclosed.

JP 2004-337385 A

  However, when the wearer is a younger infant, the disposable diaper is frequently replaced and often replaced at night, but the disposable diaper described in Patent Document 1 is stably attached to the wearer in consideration of such a situation. Sufficient measures have not been taken in terms of

  In addition, when the wearer is an older infant, since the wearer tries to move around even when the disposable diaper is worn, the disposable diaper must be worn on the wearer in a short time. In the described disposable diaper, it is difficult to make the wearer wear it stably.

  Furthermore, in the disposable diaper described in Patent Document 1, the crotch region of the disposable diaper and the wearer's excretion opening are too far apart when worn.

  Therefore, in the disposable diaper described in Patent Document 1, there is a problem that the indicator may not be able to notify the replacement time of the disposable diaper even when the wearer is excreting.

  For example, in the disposable diaper described in Patent Document 1, since the wearer's excretion position does not match the indicator arrangement region, a case is assumed in which the indicator does not react (discolor) even though the wearer excretes. .

  Specifically, since the mounting position of the disposable diaper has shifted from the right and left to the right, the excretion fluid is absorbed at the end of the absorbent body in the product width direction, but the indicator provided at the center in the product width direction A case where no discoloration occurs is assumed.

  Furthermore, since the crotch area of the disposable diaper and the excretion opening of the wearer are separated, when the wearer excretes in the lying position on the back, the absorbent in the crotch area does not absorb the excretion liquid, and the absorbent in the back waist area Absorbs excreted fluid. As a result, a case where only the indicator located on the wearer's back side changes color is assumed.

  In particular, if the wearer is wearing a romper, the wearer should be positioned on the back side of the wearer to open the romper's crotch area and check the indicator to determine whether the wearer has excreted. In the case where only the indicator to be discolored, the wear assistant thinks that the wearer is not excreting.

  Previously, the disposable diaper changer timing was determined in a complex manner by touching or smelling the disposable diaper according to the rule of thumb of the wearing assistant.

  However, in recent years, with the increase in cases in which wear assistants are unfamiliar with childcare and the shortening of childcare hours for wear assistants, wear assistants are increasingly relying on indicators to determine when to change disposable diapers, There is an increasing need to properly discolor the indicators.

  Also, the wearer's awareness of cleanliness has been increasing year by year, and the wearer's desire to replace disposable diapers if the wearer excretes has increased, and the discoloration bias of the indicator is excessive for disposable diapers. It may be necessary to make an exchange.

  Then, this invention is made | formed in view of such a condition, and it aims at providing the disposable diaper which can make mounting | wearing with a wearer stable and can make an indicator react appropriately.

  A first feature of the present invention is a disposable diaper having a front waistline region, a rear waistline region, a crotch region positioned between the front waistline region and the rear waistline region, and a pair of leg regions An opening is formed, and includes an absorbent body extending across the crotch region and extending toward the front waistline region and the rear waistline region, a product longitudinal direction from the front waistline region toward the rear waistline region, and the product longitudinal direction A disposable diaper having a product width direction orthogonal to the direction, wherein the leg elastic member is formed so as to extend from the front waistline region to the rear waistline region, straddling the crotch region, along the leg opening. A waistline holding portion that extends along the product width direction in the front waistline region and the rear waistline region and is configured to hold the disposable diaper on a wearer's body; A crotch stretchable part that can be stretched and formed at a position that overlaps the region where the absorber is disposed across the center in the product width direction, and the crotch stretchable part includes the waistline holding part and the leg elastic member 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 stretchable portion, and the product longitudinal direction straddles the crotch stretchable portion. An indicator is provided that extends in a direction and visually changes when it comes into contact with moisture, and the change is visible from the non-skin contact surface side of the disposable diaper. .

  According to the features of the present invention, it is possible to provide a disposable diaper that can be stably attached to a wearer and can appropriately react with an indicator.

It is an expanded top view (skin contact surface side S2) of the disposable diaper concerning a 1st embodiment of the present invention. It is a development top view (non-skin contact surface side S1) of the disposable diaper concerning a 1st embodiment of the present invention. It is sectional drawing of the disposable diaper which concerns on this embodiment along the F1-F1 line | wire shown in FIG.1 and FIG.2. It is sectional drawing of the disposable diaper which concerns on this embodiment along the F1-F1 line | wire shown in FIG.1 and FIG.2. It is sectional drawing of the disposable diaper which concerns on this embodiment along the F2-F2 line | wire shown in FIG.

(First embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 5, the disposable diaper 10 which concerns on the 1st Embodiment of this invention is demonstrated.

  In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

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

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

  FIG. 1 is a developed plan view of the disposable diaper 10 according to this embodiment as viewed from the non-skin contact surface side S1, and FIG. 2 is a view of the disposable diaper 10 according to this embodiment as viewed from the skin contact surface S2 side. 3 and 4 are cross-sectional views of the disposable diaper 10 according to the present embodiment taken along line F1-F1 shown in FIG. 1, and FIG. 5 is a cross-sectional view of F2 shown in FIG. It is sectional drawing of the disposable diaper 10 which concerns on this embodiment along line -F2.

  1 and 2 show the elastic members (leg elastic members) of the leg stretchable part 75 and the leg side gathers 80 until the folds such as the top sheet 50 and the side flaps 70 constituting the disposable diaper 10 are not formed. ) 71 is a view of the extended state.

  As shown in FIGS. 1 and 2, the disposable diaper 10 according to this embodiment includes a front waistline region 20, a crotch region 25, and a back waistline region 30.

  Here, the front waistline region 20 is a portion in contact with the wearer's front waistline portion (abdomen portion), and the rear waistline region 30 is a portion in contact with the wearer's back waistline portion (back portion). Is a portion located between the front waistline region 20 and the rear waistline region 30.

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

Here, in the crotch region 25, and crotch portion 200 is formed, a region of the ventral wearer than the crotch portion 200, prior to define a body times Ri region 20, the wearer than the crotch portion 200 the dorsal region, assumed to be defined as Ri zone 30 rear body dose.

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

  The disposable diaper 10 according to the present embodiment includes an absorbent body 40 that straddles the crotch region 25 and extends from the crotch region 25 toward at least one of the front waistline region 20 and the rear waistline region 30.

  As shown in FIGS. 3-5, the absorber 40 is comprised by the absorptive core 40a and the core wrap 40b.

  The absorptive core 40a is the same as that used in conventional disposable diapers, and the absorptive core 40a can be appropriately configured by using known members and materials such as pulverized pulp and superabsorbent polymer. The absorbent core 40a is wrapped with a sheet-like core wrap 40b.

  The core wrap 40b is a sheet that covers the absorbent core 40a. At least a part of the skin contact surface side S2 of the core wrap 40b is made of various fiber nonwoven fabrics or tissue sheets having liquid permeability.

For example, as the member constituting the core wrap 40b, and air-through fibrous nonwoven fabric of weight approximately 10 to 30 g / ^{m 2,} and spunbonded nonwoven fabric, SMS (spunbond - Merutoburon - spunbond) nonwoven fabric and a mass of about 10 to 30 g / m ^Two tissue sheets can be used.

  Moreover, as shown in FIGS. 3-5, the liquid permeable top sheet | seat 50 is provided in the surface side (skin contact surface side S2) of the absorber 40, and the back surface side (non-contained) The skin contact surface side S1) is provided with a liquid-impermeable back sheet 60a.

  As shown in FIGS. 3 to 5, on the back surface side (non-skin contact surface side S <b> 1) of the back sheet 60 a, one sheet 61 that extends across the crotch region 25 and extends to the front waistline region 20 and the rear waistline region 30. (For example, a film) is provided, and an exterior sheet 60 is provided on the back surface side (non-skin contact surface side S1) of the sheet 61.

  Here, a design that is visible from the non-skin contact surface side S <b> 1 of the disposable diaper 10 is provided in a region extending across the crotch region 25 and extending to the front waistline region 20 and the rear waistline region 30. Such a design is provided on the sheet 61.

  Side flaps 70 are respectively provided at both side edges in the product width direction W of the absorber 40. The side flap 70 is comprised by the nonwoven fabric which piled up the 1 sheet or 2 or more sheets.

  Moreover, as shown in FIG.1 and FIG.2, the fastening tape 90 is provided in the pair of side flaps 70, respectively.

  The fastening tape 90 extends in the product width direction W in the rear waistline region 30 and is configured to hold the disposable diaper 10 on the wearer's body by being attached to the non-skin contact surface of the front waistline region 20. Has been.

  The target portion 95 is disposed on the non-skin contact surface of the front waistline region 20, and the pair of fastening tapes 90 are configured to be fixed to the target portion 95.

  In the disposable diaper 10 according to the present embodiment, the fastening tape 90, the front waistline region 20 (target portion 95), and the back waistline region 30 extend in the product width W direction in the front waistline region 20 and the back waistline region 30. The waistline holding part comprised so that the disposable diaper 10 may be hold | maintained at a wearer's body is comprised.

  Here, the waistline holding portion in the rear waistline region 30 is a range extending in the product width direction W from the region where the engaging member of the fastening tape 90 is provided, and the waistline holding portion in the front waistline region 20 is the target portion 95. This is a range extending in the product width direction W from the provided region.

  Moreover, as shown in FIG.1 and FIG.2, the disposable diaper 10 which concerns on this embodiment is provided with the crotch expansion-contraction part 200a which can be expanded-contracted formed in the crotch region 25. As shown in FIG.

  Specifically, the crotch expansion / contraction part 200a is in the crotch part 200, more specifically, in the absorber arrangement region where the absorber 40 is arranged in the crotch region 25 across the center in the product width direction. Is formed. The configuration of the crotch expansion / contraction part 200a will be described in detail later.

  Further, as shown in FIGS. 1 and 2, a pair of legs formed along the leg opening 35 on the surface side (top sheet 50 side) of the absorber 40 and capable of expanding and contracting at least in the product longitudinal direction L. An expansion / contraction part (leg gather) 75 is provided.

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

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

The leg stretchable portion 75 is a portion that is substantially contracted in the product longitudinal direction L by the stretchable sheet or the like, and is a concept that excludes a portion where the stretchable sheet is disposed in a state where the contractile force is not exerted. In addition, the structure of the leg expansion-contraction part 75 is demonstrated in detail later.
<Legside gather 80>
Further, as shown in FIG. 1, a pair of leg side gathers 80 extending along the product longitudinal direction L may be provided inside the pair of leg stretchable portions 75 (near the center in the product width direction W). .

  The leg side gathers 80 are provided at the inner end of the side flap 70 in the product width direction W, and are erecting and expanding gathers that are disposed on the inner side in the product width direction W than the leg stretchable parts 75.

  Leg side gathers 80 can adopt a conventionally well-known configuration. Specifically, the leg side gathers 80 may be configured by a sheet material different from the side flap 70.

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

  As shown in FIGS. 3 and 4, elastic members 71 (see FIGS. 3 and 4) are provided between the side flaps 70 in a stacked state in a state of being stretched in the product longitudinal direction L. A leg side gather 80 is formed by the side flap 70 and the elastic member 71.

  The leg side gather 80 has a joining portion 81 joined to the top sheet 50 or the back sheet 60a, and a free end portion 82 on which the elastic member 71 is disposed.

  Of the free end portion 82, the central portion in the product longitudinal direction L including the crotch region 25 is contracted in the product longitudinal direction L by the elastic member 71 to form a contracted portion 84.

  When the disposable diaper 10 is worn, the leg side gather 80 rises with the joint portion 81 as the base end portion, and the contraction portion 84 of the free end portion 82 contacts the wearer's skin with the apex portion. That is, the joint portion becomes the base end portion of the rising side of the leg side stretchable portion.

  The contraction portion 84 is a portion substantially contracted in the product longitudinal direction L by the elastic member 71 and is a concept excluding a portion where the elastic member 71 is disposed in a state where the contraction force is not exerted.

  Moreover, in FIG.1 and FIG.2, in the leg side gathers 80, the joining part 81 where the side flap 70 and the top sheet | seat 50 (or back seat | sheet 60a etc.) were joined is shown with a diagonal line.

  A plurality of joint portions 81 are provided, the first joint portion 81A is disposed outside the contraction portion 84 in the product longitudinal direction L, and the second joint portion 81B is in the product width direction than the contraction portion 84. It is arranged outside W.

  Therefore, the leg side gathers 80 are configured such that the center portion in the product longitudinal direction L including the crotch region 25 rises toward the wearer.

  Of the joint portions 81 of the leg side gathers 80, the first joint portions 81 </ b> A arranged outside the contraction portion 84 in the product longitudinal direction L are joined to the top sheet 50.

  Among the joint portions 81 of the leg side gathers 80, the second joint portion 81 </ b> B disposed outside the contraction portion 84 in the product width direction W is the crotch stretch portion 200 a and the leg stretch portion 75 in the product width direction W. It is arranged between.

  The second joining portion 81B is joined to the back sheet 60a (and the exterior sheet 60 in a part in the product longitudinal direction L) with the entire length in the product longitudinal direction L. In addition, the back sheet 60a is arrange | positioned between the absorber 40 and the exterior sheet 60, and functions as a leak-proof sheet.

  The joining portion 81 of the leg side gather 80 can employ various configurations. The joining portion 81 may be, for example, a portion that extends from the crotch portion 25 to the front waistline region 20 and the back waistline region 30 in the product longitudinal direction L and is joined to the top sheet 50, or more than the absorbent core 40a. Outside the product width direction W, it may be a portion bonded to the liquid-impermeable back sheet 60a or the exterior sheet 60, and is configured to be an upright base end.

Moreover, the leg side gather 80 should just be a standing gather arrange | positioned inside the product width direction W rather than the leg expansion-contraction part 75, and is not limited to the above-mentioned structure, Conventionally known leg side gather 80 Of course, the configuration can be adopted.
<West stretchable part (West gather) 100>
Moreover, the disposable diaper 10 may be provided with the waist expansion-contraction part 100 which is formed in the back waist area 30 and can expand-contract in the product width direction W.

  Specifically, the waist stretchable portion 100 is provided between the pair of fastening tapes 91 in the product width direction W, and is configured to contract between the fastening tapes 91 in the product width direction W.

  In this embodiment, the waist elastic part 100 is comprised with the elastic sheet. The member constituting the waist stretchable portion 100 is not particularly limited, but it is preferable to use a member that is as thin as possible, has low bending rigidity, and has a small width ratio.

  Here, by configuring the waist stretchable part 100 with a material having low bending rigidity, the waist stretchable part 100 is easily bent along the wearer's body, and the waist stretchable part is not subjected to a load on the wearer's body. 100 can be fitted along the wearer's body.

  Moreover, by comprising the waist elastic part 100 with the material with small width | variety, when the disposable diaper 10 expand | extends to the product width direction W, the shrinkage | contraction of the product longitudinal direction W of the disposable diaper 10 is suppressed, and a waist circumference of a wearer In (waist), it can suppress that the disposable diaper 10 pulls down to a wearer's crotch side.

In the present embodiment, a stretchable film having a basis weight of 20 to 45 g / m ² is used as the waist stretchable portion 100.

  The waist stretchable part 100 is stretched to 1.25 to 2.5 times the length in the non-stretched state (natural state), and then adhered to the exterior sheet 60 by a hot melt adhesive or heat treatment.

  In the present embodiment, the waist stretchable portion 100 is disposed between the exterior sheet 60 and the backsheet 60a. However, in the configuration in which the core wrap 40b extends outward in the product longitudinal direction L from the absorbent core 40a, the waist stretchable portion 100 is between the core wrap 40b and the back sheet 60a (or the exterior sheet 60). It may be arranged.

  The position of the waist stretchable part 100 is not particularly limited. Moreover, in the area | region where the absorber 40 is not arrange | positioned, the waist elastic part 100 may be arrange | positioned between the side flap 70 and the back seat | sheet 60a (or exterior sheet | seat 60).

In addition, although the waist expansion-contraction part 100 which concerns on this embodiment is comprised so that it may expand-contract in the product width direction W, you may be comprised so that it may expand / contract to both the product width direction W and the product longitudinal direction L. .
<Low rigidity region 210 in the absorber 40>
Here, the absorber 40 has a low rigidity region 210 in the rear waistline region 30 that has a lower basis weight than other portions of the absorber 40 or does not have the absorbent core 40a.

  Further, the low rigidity region 210 is formed so as to extend to the vicinity of the end E9 on the rear waistline region 30 side in the product longitudinal direction L of the absorber 40.

  The width of the low-rigidity region 210 in the product width direction W becomes wider toward the end E9 on the rear waistline region 30 side in the product longitudinal direction L of the absorber 40.

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

  Furthermore, the absorber 40 has the expansion / contraction suppression area | region 220 which is an area | region where the expansion-contraction in the product width direction W was suppressed rather than the other area | region.

  Here, the expansion / contraction suppression region 220 is formed outside the low-rigidity region 210 in the product width direction W, as shown in FIG.

  Further, the boundary between the expansion / contraction suppression region 220 and the low rigidity region 210 is formed by an arc that protrudes toward the center in the product width direction W. Further, the absorber 40 on the outer side in the product width direction W than the low-rigidity region 210 has a trapezoidal shape that protrudes toward the end E9 on the rear waistline region 30 side.

  According to this configuration, the wear assistant can be given an image of the shape of the buttocks of the wearer.

  In particular, when the disposable diaper 10 is a tape-type disposable diaper 10, when the disposable diaper 10 is laid under the wearer's body, the absorbent core 40a has the above-mentioned shape, or Since the waist elastic part 100 of the back waist area 30 is made into the above-mentioned shape, since the position which should put a wearer's buttocks can be reminded with respect to a wear assistant, the disposable diaper 10 is more correctly positioned. It becomes possible to attach to.

  In addition, the waist elastic part 100 and the absorber 40 are comprised so that it may overlap in at least one part in planar view of the disposable diaper 10. FIG.

  Specifically, the waist stretchable part 100 is configured to overlap at least a part of the low-rigidity region 210 in a plan view of the disposable diaper 10.

  In the present embodiment, the waist stretchable portion 100 is disposed so as to overlap a part of the low-rigidity region 210, but may be disposed so as to overlap all of the low-rigidity region 210.

  By forming such a low-rigidity area 210, the expansion / contraction of the waist elastic part 100 is not hindered, and even if the waist elastic part 100 contracts, the low-rigidity area 210 becomes narrower and the product is lower than the low-rigidity area 210. Since the interval between the absorbers 40 on the outer side in the width direction W is narrowed, the absorber 40 is unlikely to rise in an unintended shape.

  In addition, it is preferable that the low rigidity area | region 210 has a width | variety narrower than the width | variety of the waist expansion-contraction part 100, when the leakage prevention of excretion liquid is considered.

  Further, when the absorber 40 is contracted in the product width direction W by the waist stretchable part 100 and the interval between the absorbers 40 outside the product width direction W becomes narrower than the low stiffness region 210, the low stiffness region 210 Since the portion closer to the end E9 on the rear waistline region 30 side is closer to the center in the product width direction W than the portion closer to the inseam region 25, the portion closer to the end E9 on the rear waistline region 30 side and the inseam region A difference in the amount of shrinkage in the product width direction W occurs at a portion closer to 25, and the rear waistline region 30 rises.

  That is, since the disposable diaper 10 is provided with the waist stretchable portion 100 that can be stretched in the product width direction W and the wedge-shaped low-rigidity region 210, the disposable diaper 10 is attached to the non-skin contact surface side S1 when the disposable diaper 10 is worn. A cup shape in which the disposable diaper 10 swells is easily formed.

  In the present embodiment, the low-rigidity area 210 does not include the absorbent core 40a, and the waist stretchable part 100 exists so as to overlap the low-rigidity area 210. The portion near the end E9 on the 30 side is closer to the center of the product width direction W than the end position of the absorbent core 40a, and the rise of the rear waistline region 30 becomes more prominent, making the cup shape more stable Can be formed.

  In this embodiment, since the waist elastic part 100 exists beyond the side edge in the product width direction W of the absorbent core 40a, the back waistline region 30 in the product longitudinal direction L while forming the disposable diaper 10 in a cup shape. About the absorptive core 40a of the position near the edge part E9 side, it can be made to follow a wearer's body positively.

  Furthermore, at least a part of the waist stretchable portion 100 and the low-rigidity region 210 exists in a region extending in the product width direction W from the pair of fastening tapes 90.

  Therefore, even when the disposable diaper 10 is attached to the wearer while the disposable diaper 10 is laid down and laid on the wearer, the waist stretchable part exists beyond the side edge in the product width direction W of the absorbent core 40a. 100 is not laid under the wearer's body.

  Therefore, by pulling the pair of fastening tapes 90, the side edges of the waist stretchable part 100 are extended, and it becomes easy to make the position of the cup shape closer to the waist side more reliably along the wearer's body.

  In the present embodiment, the absorbent core 40a on the outer side in the product width direction W than the low-rigidity region 210 has a convex shape toward the rear waistline region 30 side. Therefore, as described above, in addition to facilitating the formation of a cup shape in which the disposable diaper 10 swells on the non-skin contact surface side S1, the surface area of the absorbent core 40a is maintained, so that the absorbent core 40a Leakage of excreted liquid from the end can be prevented.

  In the present embodiment, the low-rigidity region 210 has a wedge shape in the plan view of the disposable diaper 10, and the boundary between the absorbent core 40 a and the low-rigidity region 210 is an arc that protrudes toward the crotch region 25. Is formed by. In addition, the radius of this circular arc is 50 mm-200 mm.

  For this reason, the length (width) in the product width direction W of the low rigidity region 210 (in a natural state) increases nonlinearly as it goes to the end E9 on the rear waistline region 30 side in the product longitudinal direction L. Since the rise of the waist region 30 becomes more prominent, the cup shape can be formed more stably.

  Furthermore, since the boundary between the absorbent core 40 a and the low rigidity region 210 is formed by an arc that protrudes toward the crotch region 25, the rear waistline region 30 is rounded by the contraction of the low rigidity region 210. It becomes a cup shape and becomes a shape which is easy to follow a wearer's rounded buttocks.

Moreover, the low rigidity area | region 210 is formed, The convex shape which goes to the back circumference area 30 side is formed in the edge part E9 by the side of the back trunk circumference area 30 of the absorber 40 on either side. Since the shape of the absorber 40 is reminiscent of putting the wearer's buttocks on, the wear assistant has an effect that the disposable diaper 10 can be more easily aligned with the correct position for the wearer.
<Bending rigidity of absorber 40>
The bending stiffness in the present embodiment is based on a stiffness value based on the Taber method (JISP8125), and is measured by the following method.

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

  The sample has a dimension of 70 mm (length in the product width direction W) × 38 mm (length in the product longitudinal direction L) with respect to the portion to be measured for bending rigidity. When an elastic member is included in the sample, the elastic member is removed. Note that a Taber stiffness tester manufactured by Yasuda Seiki Seisakusho Co., Ltd. is used as a tester for measuring the rigidity value. Moreover, the number of samples is 10, and it measures about each sample and makes the average value the rigidity value.

The measurement procedure is as follows (a) to (e).
(A) The thickness (A) of the collected sample is measured.
(B) Next, the sample is sandwiched to such an extent that it touches the center of the chuck (lower side) of the testing machine.
(C) The sum of the left and right gaps between the support roller and the sample is adjusted to (A) × 0.80 (mm).
(D) The auxiliary weight is appropriately selected so that the indicated load scale falls within the range of 15 to 85% of the maximum scale.
(E) Rotate the sample in both the left and right directions, stop at the point where the 15 ° support score coincides with the center score of the pendulum, and read the scale on the testing machine. The numerical value on the left side of the scale is (B), and the numerical value on the right side of the scale is (C).

  The rigidity value is obtained by the following equation.

Formula: Rigidity value (mN · m) = (((B) + (C)) / 2) × (auxiliary weight coefficient) × 9.8 1 × 10 ⁻²
If the width of the test piece cannot be 38 mm, it is converted into a bending moment of 38 mm width.

The higher the rigidity value measured in this way, the higher the bending rigidity, and the lower the rigidity value, the lower the bending rigidity.
<Fastening tape and target configuration>
The fastening tape 90 is attached to the region of the side flap 70 corresponding to the rear waistline region 30.

  Specifically, as shown in FIG. 1, the fastening tape 90 is provided with a base sheet 91 connected to the side flaps 70 and engagement hooks (not shown) as a plurality of engagement members. And a hook sheet 92 fixed to the material sheet 91.

  The hook sheet 92 is an area where an engaging member is provided, and the above-described waistline holding portion is an area extending from the hook sheet 92 in the product width direction W.

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

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

The base sheet 91 is composed of one or two or more non-woven fabrics stacked. As the base material sheet 91, a non-woven fabric manufactured by a manufacturing method such as SB (spunbond) or SMS (spunbond-meltblown-spunbond) 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 , preferably 40 to 90 g / m ² .

  The target portion 95 is provided on the non-skin contact surface of the exterior sheet 60 in the front waistline region 20. The target portion 95 is configured so that the engagement hook of the fastening tape is hooked, and functions as a loop of a hook and loop locking system. As the target portion 95, for example, an air-through nonwoven fabric can be used.

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

  Furthermore, as the target portion 95, a non-woven fabric which is a bulky non-woven fabric and which is partly embossed to prevent the non-woven fabric surface from fluffing may be used.

Further, the exterior sheet 60 of the disposable diaper 10 is formed of a non-woven fabric, and a pattern indicating the attachment position of the fastening tape 90 is printed on the back sheet 60a or the non-skin contact surface of the exterior sheet 60, or the sheet of such a pattern is backed. It can be set as the target part 95 also by arrange | positioning on the non-skin contact surface side S1 of the sheet | seat 60a or the exterior sheet | seat 60. FIG.
<Leg elastic part 75>
The leg stretchable part 75 is arranged along the leg opening 35 provided outside the absorbent body 40 in the product width direction W, and is configured to be stretchable in the product longitudinal direction L.

  The leg expansion / contraction part 75 has the width direction inner end area | region 75I in which the position in the product width direction W is located in the innermost side in the crotch area 25.

  The leg opening 35 and the leg stretchable part 75 extend toward the outside in the product width direction W from the crotch area 25 toward the outside in the product longitudinal direction L, particularly in the rear waistline area 30.

  In addition, the width direction inner end region 75I of the leg stretchable part 75 may be arranged continuously in the product longitudinal direction L or may not be continuous in the product longitudinal direction L.

  In the present embodiment, the region in which the position of the leg opening 35 in the product width direction W is located on the innermost side in the crotch region coincides with the width direction inner end region 75I of the leg stretchable portion 75, but does not necessarily match. It does not have to be.

  In this embodiment, the leg expansion / contraction part 75 is comprised with the elastic sheet. For example, the stretchable sheet may be a stretchable film formed by melting a thermoplastic elastomer resin such as urethane or styrene, a stretchable nonwoven fabric made of stretchable fibers, a stretchable film or a stretchable nonwoven fabric. A composite sheet or the like obtained by laminating a non-stretchable sheet that has been cut or weakened can be used.

  Moreover, you may comprise the leg expansion-contraction part 75 by arrange | positioning the thread-like / strip-like elastic member which consists of a polyurethane elastic fiber or natural rubber instead of this elastic sheet.

  Or the leg expansion-contraction part 75 may be comprised by the predetermined number of elastic members (for example, three elastic members), for example.

  The leg stretchable part 75 is disposed between the side flap 70 and the exterior sheet 60. Alternatively, in the region where the back sheet 60 a disposed between the absorber 40 and the exterior sheet 60 is provided, the leg stretchable part 75 is disposed between the back sheet 60 a and the side flap 70.

Specifically, the width of the stretchable sheet member (the width in the product width direction W in the natural state of the disposable diaper 10) is preferably 5 mm or more and 45 mm or less at least in the crotch region 25, and is 12.5 mm or more and 35 mm or less. In addition, it is preferable that it is below. In addition, this measurement was performed so that it might be along a measurement object site | part using the spring measure (tape part: glass fiber containing vinyl chloride coating | cover) by Shinwa Measurement Co., Ltd. (10 samples).

  Here, when the width of the stretchable sheet member is less than 5 mm, the force of partially tightening is not concentrated on the surface substantially along the circumference of the wearer's leg, and the elastic element is applied to the wearer's skin. If the effect of lowering the load does not appear and the width of the stretchable sheet member exceeds 45 mm, it is along the leg opening 35 compared to the length in the product width direction W of the entire disposable diaper 10 (in a natural state). The area becomes too wide, and the elastic sheet is easily wound around the wearer's body or turned over.

  The expansion / contraction rate of the leg expansion / contraction part 75 is preferably 1.5 to 2.2 times. For example, in this embodiment, the expansion / contraction rate of the leg expansion / contraction part 75 is set to 1.8 to 2.0 times.

  The expansion / contraction rate means the degree of expansion / contraction of the leg expansion / contraction part 75 in the expansion / contraction direction (product longitudinal direction L in the present embodiment), and is defined as follows.

Stretch rate = (length in the stretch direction of the leg stretch portion 75 in the maximum stretched state) / (length in the stretch direction of the leg stretch portion 75 in the natural state)
In addition, in this specification, this expansion / contraction rate shall be measured as follows, for example.

  1stly, when the disposable diaper 10 is enclosed with the package etc., the disposable diaper 10 is taken out from a package.

  Next, the arrangement area of the leg stretchable part 75 is cut out. At this time, it cuts out also including the exterior sheet 60 joined to the leg expansion-contraction part 75. FIG. The elongation rate of the sample of the leg stretchable part 75 after being cut out is measured, and the stretch rate of the leg stretchable part 75 is measured.

  Each sample is left for 60 minutes in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH, and the length of the leg stretchable part 75 is measured along the stretch direction. This length is defined as “the length of the leg expansion / contraction part 75 in the natural state”.

  Second, the length in the stretch direction of the desired region in such a state (ie, the natural state), and the length in the stretch direction of the desired region when stretched from the natural state to a state where wrinkles by the elastic member cannot be visually confirmed. Measure the thickness. This length is defined as “the length of the leg stretchable part 75 in the extended state”.

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

  Further, the interval between the inner ends of the pair of left and right leg stretchable portions 75 in the product width direction W becomes wider as it goes from the crotch region 25 to the front waistline region 20, and as it goes from the crotch region 25 to the rear waistline region 30. And become wider.

  When the disposable diaper 10 is mounted on the wearer's body, the leg stretchable portion 75 is arranged in a shape that narrows toward the front and rear waists in the crotch portion, so that the leg stretchable portion 75 is more line-shaped of the wearer's body. Accordingly, the leg stretchable portion 75 is suitably extended around the leg of the wearer.

  Further, the distance (D1 in the figure) at the end of the front waistline area 20 of the pair of left and right leg stretchable parts 75 is the distance (D2 in the figure) at the end of the rear waistline area 30 of the pair of left and right leg stretchable parts 75. Narrower than.

  In addition, these intervals are the inside of the pair of left and right leg stretchable parts 75 in the product width direction W after the disposable diaper 10 is expanded and held in the product longitudinal direction L and the product width direction W from the natural state to the state without wrinkles. The distance between the ends is measured.

  The elongation of the skin surface of the wearer's body is particularly large in the buttocks, and is prominent at positions closer to the outside in the width direction. Moreover, the leg expansion-contraction part 75 is closely_contact | adhered to a wearer's body. Therefore, by setting D2> D1, even when the wearer's movement is applied to the disposable diaper 10, the leg stretchable part 75 on the buttocks side of the wearer can be stretched while closely attached, and the amount of change in elongation is large. However, the leg expansion / contraction part 75 does not stretch. Therefore, the displacement of the disposable diaper 10 by the leg expansion-contraction part 75 can be suppressed.

  The interval between the wearer's legs is such that the crotch is the narrowest and widens from the crotch toward the abdomen or back. Since the leg opening 35 and the leg stretchable part 75 have shapes extending from the crotch region 25 toward the outside in the product longitudinal direction L and the outside in the product width direction W, the leg opening is provided along the wearer's leg. 35 and the leg elastic part 75 can be arrange | positioned, and since local stress concentration can be suppressed, it can contact | adhere to a wearer with a comparatively low elongation rate, and it becomes possible to reduce the burden on skin.

The leg expansion / contraction part 75 is comprised so that the disposable diaper 10 may bend | curve and contract along a wearer's leg periphery. The end of the leg stretchable part 75 in the product longitudinal direction L is arranged so as to spread in the product width direction W, and is arranged in the vicinity of the waistline holding part. Therefore, the end of the leg stretchable portion 75 in the product longitudinal direction L acts to shrink in the product width direction W together with the waistline holding portion.
<Crotch stretchable part 200a>
Next, the shape of the crotch expansion / contraction part 200a will be described.

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

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

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

  Thus, by contracting the portion where the absorbent core 40a is disposed by the crotch stretchable portion 200a, the absorbent core 40a contracts, and it is easy to maintain a flat shape as compared with the portion where the absorbent core 40a does not contract. Become.

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

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

  In addition, when the crotch stretchable portion 200a is stretchable along the product longitudinal direction L, the front waistline region 20 and the back waistline region 30 are easily raised by the shrinkage of the crotch stretchable portion 200a. A flat crotch region can be formed along the body at the part.

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

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

  In addition, as described above, the crotch stretchable portion 200a is configured to be stretchable, so that a part of the crotch region 25 of the disposable diaper 10 contracts and the clothing side (non-skin contact) of the disposable diaper 10 Irregular wrinkles are formed on the surface of the contact side S1).

  As a result, it is possible to remind the wear assistant that the crotch portion 200 is clearly present in the disposable diaper 10 according to the present embodiment visually and tactilely.

  Note that the crotch stretchable portion 200a may be configured by a stretchable sheet.

  By configuring the crotch stretchable portion 200a with the stretchable sheet, the absorbent core 40a in the region where the stretchable sheet is disposed is uniformly shrunk, and the flat shape can be easily maintained. In addition, an elastic sheet can be comprised with the elastic sheet similar to the leg expansion-contraction part 75, for example.

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

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

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

  Moreover, in order to shrink the absorptive core 40a uniformly by the crotch expansion-contraction part 200a, it is preferable that the space | interval of elastic members shall be 7 mm or less, and it is more preferable to set it as 5 mm or less. Moreover, in order to shrink the absorptive core 40a uniformly, it is desirable to make the difference of the space | interval of an adjacent elastic member into 2 mm or less.

  Specifically, the expansion / contraction rate of the crotch expansion / contraction part 200a is preferably 1.2 times or more and 1.8 times or less. For example, in this embodiment, the expansion / contraction rate of the crotch expansion / contraction part 200a is set to 1.4 times.

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

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

  1stly, when the disposable diaper 10 is enclosed with the package etc., the disposable diaper 10 is taken out from a package, and it is 60 in the atmosphere of 20 degreeC +/- 2 degreeC and relative humidity 60% +/- 5% RH in the state. Let stand for a minute, and measure the length of the crotch expansion / contraction part 200a along the expansion / contraction direction. This length is defined as “the length of the crotch expansion / contraction portion 200a in the natural state”.

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

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

  Thus, by setting the expansion / contraction rate of the crotch expansion / contraction part 200a to 1.2 times or more and 1.8 times or less, it is possible to suitably follow the expansion and contraction of the wearer's skin.

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

  That is, when the expansion ratio of the crotch expansion / contraction part 200a is 1.2 times or less, the crotch expansion / contraction part 200a is not sufficiently contracted in the natural state, and the disposable diaper 10 is compared with the case where the crotch expansion / contraction part 200a is not provided. In the crotch region 25 of the absorbent body, the shrinkage of the absorbent body arrangement region is small, and the crotch region 25 of the disposable diaper 10 becomes insufficient to take a flat shape along the body at the wearer's crotch region, so that the disposable diaper 10 becomes easy to shift from the wearer's body.

  On the other hand, if the expansion ratio of the crotch expansion / contraction part 200a is larger than 1.8 times, the contraction dimension in the contraction direction of the crotch expansion / contraction part 200a becomes too large, so that the region where the crotch expansion / contraction part 200a exists is more than along the body. The disposable diaper 10 is likely to be in a close contact state, and easily displaced downward from the wearer.

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

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

  When this inventor makes 2-8% of the length in the product longitudinal direction L of the disposable diaper 10 the shrinkage | contraction amount in the product longitudinal direction L of the crotch expansion-contraction part 200a, the process of mounting | wearing the wearer with the disposable diaper 10 with respect to a wearer. The crotch stretchable part 200a can be confirmed to be easily along the wearer's body.

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

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

  Further, the center O2 of the crotch stretchable part 200a in the product longitudinal direction L is disposed closer to the front waistline region 20 than the center O1 of the disposable diaper 10 in the product longitudinal direction L. Moreover, the crotch expansion-contraction part 200a is arrange | positioned so that the center O1 of the disposable diaper 10 in the product longitudinal direction L may be straddled.

  Moreover, the crotch expansion-contraction part 200a is formed in the position containing the center O1 of the disposable diaper 10 in the product longitudinal direction L.

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

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

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

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

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

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

  As an example, for the product length 400 mm of the disposable diaper 10 (the length of the natural state in the product longitudinal direction L), the front waistline region 20 is set to 130 mm (the length of the natural state in the product longitudinal direction L), The crotch part 200 is set to 80 mm (length in the natural state in the product longitudinal direction L), and the rear waistline region 30 is set to 190 mm (length in the natural state in the product longitudinal direction L).

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

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

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

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

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

  Furthermore, as shown in FIG. 1, the length W5 (natural state) in the product width direction W at the center position O2 of the crotch expansion / contraction part 200a in the product longitudinal direction L is at the end of the crotch expansion / contraction part 200a in the product longitudinal direction L. You may comprise so that it may become shorter than the length W6 (natural state) of the product width direction W. FIG.

  According to such a configuration, since the shape of the crotch stretchable part 200a viewed from the outside is a constricted shape, such as a crotch part of a female underwear, the wear assistant wears the disposable diaper 10 on the wearer. At the time of wearing, the crotch stretchable part 200a is mounted so as to be disposed at the crotch part of the wearer, and it can be visually confirmed that the mounting position is correct.

  Furthermore, even when worn, it is possible to remind the wearing assistant that the disposable diaper 10 has the crotch portion 200 and to give an image closer to underwear.

  As shown in FIG. 1, a notch 110 and a notch 120 are formed in the crotch region 25 of the absorber 40. The notch part 110 and the notch part 120 are areas where the absorbent core 40 a constituting the absorber 40 does not exist.

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

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

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

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

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

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

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

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

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

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

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

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

  Here, the notch part 110 and the notch part 120 are formed in order to make the first inflection part 115 and the second inflection part 125 better.

  As a result, the crotch expansion / contraction part 200a is configured not to be interlocked with the movement of the waistline holding part (that is, the front waistline area 20, the back waistline area 30 and the fastening tape 90 constituting the waistline holding part).

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

  According to the disposable diaper 10 which concerns on this embodiment, the crotch expansion-contraction part 200a can be made into the state with which a wearer's crotch part is mounted | worn straddling the center of a wearer's body.

  Moreover, in the disposable diaper 10 which concerns on this embodiment, the crotch expansion-contraction part 200a is spaced apart from the above-mentioned waistline holding part and the elastic member 71, and is provided.

  Furthermore, in the disposable diaper 10 which concerns on this embodiment, the non-stretching area | region is provided in the front waistline area 20 side and the back waistline area 30 side of the product longitudinal direction L of the crotch expansion-contraction part 200a.

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

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

  For example, the predetermined length is a length in the product width direction W of the absorbent core 40a in a region where the length in the product width direction of the front waistline region 20 and the rear waistline region 30 is long.

The region where the length in the product width direction W of the absorbent core 40a is shorter than the predetermined length, and the region where the length in the product width direction W of the front waistline region 20 and the rear waistline region 30 is longer than the predetermined length . The absorption capacity per unit length (for example, per 10 mm) in the product length direction L is different, and the absorption capacity is smaller in a region shorter than the predetermined length.

  Therefore, the area where the crotch stretchable part 200a is provided is along the wearer's body with the crotch stretchable part 200a. In this area, the indicator 600 is easily discolored even with a small amount of excretion. Since it is close to the mouth, when the amount of absorption is small, such a region first becomes a region that changes color.

  Further, in the region where the crotch stretchable portion 200a is provided, wrinkles due to the crotch stretchable portion 200a are generated. Therefore, first, the discolored region (crotch stretchable portion 200a), the front waistline region 20 and the back waistline region existing before and after the region. 30 and the indicator 600 looks different.

  Generally, in a region where the crotch stretchable portion 200a is provided, wrinkles due to the crotch stretchable portion 200a are generated, so that the wear assistant has different discoloration states of the indicator 600 between the region and the non-stretchable region. Looks.

  Considering the above points, according to the above-described configuration, the wear assistant does not replace the disposable diaper 10 in the discoloration of the indicator 600 in the region, and the front waistline region 20 side in the product longitudinal direction L of the region and Discoloration of the indicator 600 in the non-stretchable region on the rear waistline region 30 side can also be used as a guide for replacing the disposable diaper 10.

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

  In the natural state of the disposable diaper 10, it is configured such that a concavo-convex shape (皺) exists on the skin contact surface side and the non-skin contact surface side of the absorbent core 40a by contraction of the crotch expansion / contraction part 200a.

Here, skin irregularities formed on the contact surface (wrinkles) is non-skin as compared to irregularities (wrinkles) formed on the contact surface side, the pitch of the high and uneven height of irregularities Is configured to be large.

  On the skin contact surface side of the absorbent core 40a, in order to prevent the liquid flow of excrement, it is necessary that the height of the concavo-convex shape is high and the pitch is large, whereas the non-skin contact of the absorbent core 40a On the contact surface side, it is preferable to control the height of the concavo-convex shape to be low and the pitch to be small in order to make it visible while changing the visibility of the indicator 600.

For this purpose, the stretchable sheet is disposed on the non-skin contact surface side of the absorbent core 40a, and the thickness of the product configuration on the skin contact surface side of the stretchable sheet is less than that of the stretchable sheet. It is necessary to be configured such that the thickness on the contact surface side becomes smaller.
<Indicator>
As shown in FIG. 2, the disposable diaper 10 according to the present embodiment is provided with an indicator 600.

  Here, the indicator 600 extends in the product longitudinal direction L across the crotch stretchable part 200, and is made of a color change agent that visually changes when it comes into contact with moisture.

  According to such a configuration, when the crotch expansion / contraction part 200a is along the wearer's body (crotch part) at the time of wearing, the indicator 600 can stably exist at a position close to the wearer's excretion opening. become.

  As a result, it is possible to avoid a situation in which the indicator 600 is biased and discolored or a situation in which the indicator 600 is discolored only on the wearer's back side.

  Furthermore, since a wearer's excretion opening | mouth and the crotch expansion-contraction part 200a are near at the time of mounting | wearing, discoloration of the first indicator 600 can be stably generated in the crotch region 25 of the disposable diaper 10.

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

  When the crotch stretchable part 200a is formed of a liquid-impermeable stretchable sheet, the indicator 600 is disposed on the skin contact surface side S2 of the stretchable sheet as shown in FIG.

  On the other hand, when the crotch stretchable part 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 stretchable part 200a. .

  In addition, the change (discoloration) of the above-mentioned indicator 600 is visible from the non-skin contact surface side S1 of the 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 light transmittance measurement method is performed in accordance with the standard of JIS-K7105. Here, as a color difference meter, Nippon Denshoku Industries Co., Ltd. cross photometric color difference meter Z-300A may be used.

  Specifically, a sheet to be measured taken out from the disposable diaper 10 is a sample having a width of 5 mm and a length of 5 mm, and is sandwiched between turbidimeters to obtain a TT value. The TT value is recorded as the total light transmittance (%).

  In addition, about 10 samples about this measurement, it is good also considering the average value as light transmittance (%).

  According to such a configuration, the wearer can easily recognize the change (discoloration) of the indicator 600 from the non-skin contact surface side S1 of the disposable diaper 10.

  The length (width) of the crotch stretchable part 200a in the product width direction W with respect to the length (width) of the shortest absorbent core 40a in the region where the absorbent core 40a and the crotch stretchable part 200a overlap. However, it is comprised so that it may become 60% or more and 120% or less.

  The indicator 600 is configured to extend beyond the crotch stretchable part 200a in the product longitudinal direction L from the region where the absorbent core 40a and the crotch stretchable part 200a overlap.

  According to such a configuration, the absorbent core 40a and the indicator 600 are lifted along the wearer's body by the crotch stretchable part 200a, and the disposable diaper 10 can be stably mounted in a state along the wearer's body. .

  Moreover, at the time of wear, the absorptive core 40a was partially shrunk by the shrinkage | contraction of the elastic sheet which comprises the crotch expansion-contraction part 200a, and the said site | part was seen from the non-skin contact surface side (outside) of the disposable diaper 10 In this case, the appearance (shape) of the aspect close to flat can be obtained, and the indicator 600a disposed in the crotch expansion / contraction part 200a can be more visually recognized.

  On the other hand, if the length (width) of the crotch stretchable part 200a in the product width direction W is too narrow compared to the length of the absorbent core 40a in the product width direction W, the crotch stretchable part 200a is absorbed while maintaining the flatness. The effect of lifting the sex core 40a along the wearer's body is less likely to appear.

  Moreover, if the length (width) of the product width direction W of the crotch stretchable part 200a is too long compared with the length of the product width direction W of the absorbent core 40a, the region where the absorbent core 40a is not contracted is contracted. Thus, the rigidity of the outside of the product width direction W of the crotch expansion / contraction part 200a is increased.

  For this reason, the crotch expansion / contraction part 200a is easily caught on the thigh of the wearer, and the feeling of wearing is impaired.

In addition, since the crotch stretchable portion 200a is mounted in a more contracted state in the region where the absorbent core 40a does not exist, the crotch stretchable portion 200a becomes harder and more comfortable to wear because the members tend to overlap. Will be damaged.
<Method for manufacturing disposable diaper 10>
Next, an example of the manufacturing method of the disposable diaper 10 which concerns on this embodiment is demonstrated. In addition, about the manufacturing method which is not demonstrated in this embodiment, the existing method can be used. Moreover, the manufacturing method demonstrated below is an example and can also manufacture the disposable diaper 10 which concerns on this embodiment with another manufacturing method. The manufacturing method of this disposable diaper 10 includes at least a component part forming step, a component part placing step, a leg circumference forming step, a crotch expansion / contraction forming step, and a cutting step.

  In the component forming process, the components constituting the disposable diaper 10 are formed. Specifically, for example, the absorbent body 40 is formed by stacking absorbent materials.

  In the component mounting step, other webs such as a stretchable sheet constituting the leg stretchable part 75, a web constituting the topsheet 50, a leakproof sheet, and an absorber on the web constituting the backsheet 60a The components constituting the disposable diaper 10 such as 40 are placed.

  In the leg periphery forming step, the top sheet 50, the exterior sheet 60, and the back sheet 60a are cut along the outer end of the leg stretchable part 75 in the MD direction. Thereby, the leg periphery opening part 35 arrange | positioned around a wearer's leg is formed.

  In the crotch expansion / contraction forming step, the sheet constituting the crotch expansion / contraction part 200a is conveyed in a non-stretched state (however, tension necessary for conveyance) is applied, and the speed of the stretching (pre-stretching) roll using two rolls. Stretch by difference.

  Thereafter, the sheet is placed in an extended state on the transfer drum, cut to the length of each product on the transfer drum, re-pitched as the transfer drum rotates, and transferred onto a continuous web.

  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 into the size of one product along the MD direction. Thereby, the disposable diaper 10 is manufactured.

  According to the disposable diaper 10 which concerns on this embodiment, since the absorptive core 40a contracted by the crotch expansion-contraction part 200a is maintained flat along a wearer's body, the right-and-left shift | offset | difference and the back-and-forth shift at the time of mounting | wearing generate | occur | produce Hard to do.

  Moreover, according to the disposable diaper 10 which concerns on this embodiment, the area | region maintained by the flat where the crotch expansion-contraction part 200a is arrange | positioned becomes difficult to bend | fold during mounting | wearing, and the indicator 600 is in the position which is always easy to see from a wear assistant. It becomes easy to be held.

  Moreover, according to the disposable diaper 10 which concerns on this embodiment, in the area | region where the crotch expansion-contraction part 200a is arrange | positioned, since the absorptive core 40a is shrink | contracted, it becomes high-weight compared with another area | region, and an absorber Since the surface of 40 has gentle irregularities, the surface flow of the excretory liquid hardly occurs and is stably absorbed.

  Furthermore, according to the disposable diaper 10 which concerns on this embodiment, when the absorption capacity of the absorber 40 in the area | region where the crotch expansion-contraction part 200a is exceeded, the indicator 600 in the above-mentioned non-expandable area | region will discolor, Therefore Since the assistant can grasp the amount of excretion fluid absorbed, the assistant can avoid excessive replacement of the disposable diaper 10 and replace the disposable diaper 10 at an appropriate timing.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

DESCRIPTION OF SYMBOLS 10 ... Disposable diaper 20 ... Front waistline area 25 ... Inseam area 30 ... Rear waistline area 35 ... Leg opening 40 ... Absorber 40a ... Absorbent core 40b ... Core wrap 50 ... Top sheet 60a ... Back sheet 60 ... Exterior sheet 61 ... Sheet 70 ... Side flap 71 ... Elastic member 75 ... Leg stretchable part 80 ... Leg side gather 81 ... Joint part 82 ... Free end part 90 ... Fastening tape 95 ... Target part 100 ... West stretchable part 110, 120 ... Notch part 115 ... No. 1 inflection part 125 ... 2nd inflection part 200 ... crotch part 200a ... crotch expansion / contraction part 600 ... indicator

Claims (7)

A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
A pair of leg openings are formed,
An absorbent body extending across the crotch region and extending toward the front waistline region and the rear waistline region,
A disposable diaper having a product longitudinal direction from the front waistline region to the rear waistline region, and a product width direction orthogonal to the product longitudinal direction,
A leg elastic member formed so as to extend from the front waistline region to the rear waistline region across the crotch region along the leg opening.
In the front waistline region and the rear waistline region, a waistline holding portion that extends along the product width direction and is configured to hold the disposable diaper on a wearer's body;
A crotch stretchable part that can be stretched and formed at a position overlapping the area where the absorber is disposed across the center in the product width direction in the crotch region,
The crotch stretchable part is provided apart from the waistline holding part and the leg elastic member,
A non-stretchable region is provided on the front waistline region side and the back waistline region side in the product longitudinal direction of the crotch stretchable portion,
An indicator configured to extend in the longitudinal direction of the product across the crotch stretchable part and visually change when in contact with moisture,
The change is visible from the non-skin contact surface side of the disposable diaper ,
The disposable diaper characterized in that the amount of shrinkage of the crotch stretchable part in the product longitudinal direction is 2% or more and 8% or less of the length of the disposable diaper in the product longitudinal direction. A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
A pair of leg openings are formed,
An absorbent body extending across the crotch region and extending toward the front waistline region and the rear waistline region,
A disposable diaper having a product longitudinal direction from the front waistline region to the rear waistline region, and a product width direction orthogonal to the product longitudinal direction,
A leg elastic member formed so as to extend from the front waistline region to the rear waistline region across the crotch region along the leg opening.
In the front waistline region and the rear waistline region, a waistline holding portion that extends along the product width direction and is configured to hold the disposable diaper on a wearer's body;
Stretchable crotch stretch part formed at a position overlapping the region where the absorber is disposed across the center in the product width direction in the crotch region ,
Fastening tape extending in the product width direction in the rear waistline region,
A target portion that is disposed on the non-skin contact surface of the front waistline region and to which the fastening tape is fastened;
With
The waistline holding portion in the rear waistline region is a range extending in the product width direction from a region where the fastening tape engaging member is provided,
The waistline holding portion in the front waistline region is a range extending in the product width direction from a region where the target portion is provided,
The crotch stretchable part is provided apart from the waistline holding part and the leg elastic member,
A non-stretchable region is provided on the front waistline region side and the back waistline region side in the product longitudinal direction of the crotch stretchable portion,
An indicator configured to extend in the longitudinal direction of the product across the crotch stretchable part and visually change when in contact with moisture,
The change is Ri viewable der from non-skin contact surface side of the disposable diaper,
The disposable diaper characterized in that the center of the crotch stretchable part in the product longitudinal direction is arranged closer to the front waistline region than the center of the disposable diaper in the product longitudinal direction. The absorber has an absorbent core,
The length of the absorbent core in the product width direction is configured to be shortened from the front waistline region toward the crotch region, and to be shortened from the rear waistline region toward the crotch region,
The disposable diaper according to claim 1 or 2 , wherein the crotch stretchable portion is provided in a region where the length of the absorbent core in the product width direction is shorter than a predetermined length. The absorber has an absorbent core,
The shrinkage ratio of the crotch stretchable part is 1.2 times or more and 1.8 times or less,
In the natural state of the disposable diaper, on the skin contact surface side and the non-skin contact surface side of the absorbent core, the crotch expansion and contraction part is configured to have a concavo-convex shape,
Uneven shape formed on the skin contact surface side, and wherein the non-skin compared to the uneven shape formed on the contact surface side, and is configured so that the height is high and the pitch is increased The disposable diaper according to any one of claims 1 to 3 . The ratio between the length in the product longitudinal direction of the length in the product longitudinal direction and the front waist region of the rear waist region is more of claims 1 to 4, characterized in that 1.1 to 1.6 The disposable diaper as described in any one item . The absorber has an absorbent core,
The ratio between the length in the product width direction of the length and the absorbent core in the product width direction of the crotch stretch unit, according to claim 1 or any one of the 5, characterized in that 60% to 120% or less The disposable diaper described in the item . The crotch stretchable part is constituted by an stretchable sheet,
The stretchable sheet is provided on the non-skin contact surface side of the indicator,
The disposable diaper according to any one of claims 1 to 6, wherein the stretchable sheet has a light transmittance of 60% or more and 87% or less.

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