JP6343495B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

  Conventionally, open-type disposable diapers have been widely used. In an open type disposable diaper, a fastening tape is provided on a side flap, and a target tape that is engaged with the fastening tape is provided on a front portion (also referred to as a ventral region or a front waistline portion). Such open-type disposable diapers are widely used particularly for newborns and infants because of their ease of attachment and detachment.

JP2013-212212A JP 2013-138702 A JP 2013-230256 A JP 2013-158573 A International Publication No. 2013/077360

In an open-type disposable diaper, it is easy to put on and take off, but the fit of the leg recliner when worn may be a problem. For example, when diapers are worn by infants, etc., the fastening openings of the diaper are tightened tightly so that excretion excreted in the diaper does not leak out from the opening of the leg circumference of the diaper. And the wearer's leg may be difficult to create a gap. In such a case, the leg retraction part of a diaper becomes easy to bite into a wearer's skin, and when a wearer moves a leg, a strange feeling may be produced and a touch may be worsened. In addition, in the case of a newborn baby with weak skin, the leg is strongly tightened, resulting in deterioration of blood flow and swelling or discomfort.
This invention is made | formed in view of the above problems, The place made into the objective is to provide the disposable diaper which has a favorable touch in a leg retraction part.

The main invention for achieving the above object is:
A disposable diaper having a longitudinal direction and a width direction intersecting the longitudinal direction,
A central strip region containing an absorber that absorbs liquid;
Side flaps located on both sides in the width direction of the central strip region;
A belt-like leg-hole elastic sheet provided on the side flap and extending and contracting along the longitudinal direction;
Have
The edge portion on the outer side in the width direction of the side flap is a meandering portion in which convex portions that are convex outward in the width direction and concave portions that are concave in the outer side in the width direction are alternately repeated in the longitudinal direction. With
The leg-hole elastic sheet is disposed on the inner side in the width direction than the concave portion of the side flap ,
The side flap includes a front part located on the stomach side of the wearer when wearing the disposable diaper, a rear part located on the back side of the wearer, and a crotch part located between the front part and the rear part. And having
In the crotch part of the side flap, the distance between the two convex portions adjacent in the longitudinal direction is constant,
The largest distance between the two convex portions adjacent in the longitudinal direction at the rear portion of the side flap is the distance between the two convex portions adjacent in the longitudinal direction at the crotch portion of the side flap. It is a disposable diaper characterized by being wider than the distance .

  Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  ADVANTAGE OF THE INVENTION According to this invention, the disposable diaper which has a favorable touch in a leg retraction part can be provided.

It is an expanded top view of diaper 1. 2A to 2C are exploded explanatory views of each part of the diaper 1. FIG. FIG. 2A is an exploded explanatory view of the front portion 3. FIG. 2B is an exploded explanatory view of the crotch portion 5. FIG. 2C is an exploded explanatory view of the rear portion 7. It is explanatory drawing of a positioning attitude | position. It is a figure explaining the form of the diaper 1 at the time of wear. It is a side view showing the mode at the time of wearing of the diaper. 3 is a schematic plan view illustrating the configuration of a side flap 14. FIG. It is the figure expanded and represented about the edge part 14Lg of the side flap 14. FIG.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
A disposable diaper having a longitudinal direction and a width direction intersecting with the longitudinal direction, the central strip region including an absorbent that absorbs liquid, and both sides of the central strip region in the width direction A side flap, and a belt-like leg-hole elastic sheet that is provided on the side flap and expands and contracts along the longitudinal direction, and the edge of the side flap on the outer side in the width direction is on the outer side in the width direction. Protruding convex portions and concave portions recessed outward in the width direction include meandering portions that are alternately repeated in the longitudinal direction, and the leg-hole elastic sheet is more than the concave portions of the side flaps. Disposable diaper characterized by being disposed inside in the width direction According to such a disposable diaper, it is possible to provide a disposable diaper having a good touch at the leg retraction part. it can.

In this disposable diaper, it is preferable that the leg-hole elastic sheet is arranged linearly along the longitudinal direction.
According to such a disposable diaper, since the leg elastic sheet and the end edge of the side flap are in a parallel positional relationship at the crotch, the elastic force of the leg elastic sheet with respect to the end edge of the side flap Can be applied evenly. As a result, problems such as strong tightening in a partial region of the edge portion of the side flap are less likely to occur.

In this disposable diaper, the distance between the convex portion and the concave portion in the width direction is larger than the distance between the concave portion and the outer end portion in the width direction of the leg-hole elastic sheet. Is desirable.
According to such a disposable diaper, the elastic force of the leg elastic sheet is less likely to act directly on the edge of the side flap that forms the leg opening, and the concave and convex portions are maintained in their respective shapes. It is easy to sag, and even when a diaper is worn, the meandering shape of the edge is easily maintained. Thereby, the force which acts on the edge part of a side flap is disperse | distributed, and favorable touch can be implement | achieved, making the stretchability of the grade which does not impair the feeling of fitting in a leg periphery opening part.

Such a disposable diaper, wherein the side flap includes a front part located on the abdomen side of the wearer when wearing the disposable diaper, a rear part located on the back side of the wearer, the front part and the rear part It is desirable that a distance between two convex portions adjacent to each other in the longitudinal direction is constant in the crotch portion of the side flap.
According to such a disposable diaper, a force is easily applied to each of the uneven portions. As a result, problems such as strong tightening in a partial region of the edge portion of the side flap are less likely to occur.

In this disposable diaper, the largest one of the distances between the two convex portions adjacent to each other in the longitudinal direction at the rear portion of the side flap is adjacent to the longitudinal direction at the crotch portion of the side flap. It is desirable that the distance is larger than the distance between the two convex portions.
According to such a disposable diaper, since the curve of the edge part which contacts a wearer's buttocks in the rear region of the side flap becomes smooth, it is possible to realize a good touch by softening the feel in the buttocks. .

In this disposable diaper, it is preferable that a length in the width direction at the rear portion of the side flap is longer than a length in the width direction at the crotch portion of the side flap.
According to such a disposable diaper, since the area which a side flap covers a wearer's buttocks in the area | region of a rear part becomes large at the time of wear, a favorable wearing feeling can be implement | achieved.

In such a disposable diaper, the absorbent body has a pair of dart portions each having a basis weight of a liquid absorbent material smaller than that of other portions on the front side and the rear side in the longitudinal direction of the crotch portion, It is desirable that the rear portion of the flap is a region located on the rear side in the longitudinal direction with respect to the dart portion provided on the rear side in the longitudinal direction of the crotch portion.
According to such a disposable diaper, the width of the side flap is narrower on the front side in the longitudinal direction than the rear dart part, and the width of the side flap is widened on the rear side. Thereby, it becomes easy to suppress that a wearer's buttocks protrudes from a side flap in the rear part side, making it easy for a wearer to move a leg in the front part side of a longitudinal direction.

In this disposable diaper, the front end in the longitudinal direction of the leg elastic sheet and the rear end in the longitudinal direction of the leg elastic sheet are in the same position in the width direction. desirable.
According to such a disposable diaper, since it becomes easy to apply an elastic force evenly to the edge of the side flap, it is suppressed that the tightening force of the leg retraction part is locally increased, and a good touch is achieved. It becomes easy to realize. Further, even when the diaper is worn upside down, it is possible to apply a force evenly to the edge without impairing the function of the diaper.

In this disposable diaper, the side flap includes a liquid-permeable top sheet disposed on the skin side of the wearer, a back sheet disposed on the non-skin side of the wearer, the top sheet, and the back sheet. A liquid-impervious leak-proof sheet disposed between and the position of the outer end in the width direction of the leak-proof sheet is on the inner side in the width direction than the concave portion of the side flap. Is desirable.
According to such a disposable diaper, since the material of the fabric is hard and the leak-proof sheet, which tends to be uncomfortable, is arranged away from the edge of the side flap, the edge area is kept soft, and the diaper is worn. The feel of the leg repetitive part at the time can be made favorable.

In this disposable diaper, it is preferable that the side flap has a notch portion formed of a curved line protruding inward in the width direction at the front end portion and the rear end portion in the longitudinal direction.
According to such a disposable diaper, by providing the notch portion, the corner portion of the side flap is less likely to hit the wearer's abdomen, and the feel around the waist can be improved.

=== Embodiment ===
<Basic configuration of disposable diaper 1>
The disposable diaper 1 of the present embodiment (hereinafter also simply referred to as diaper 1) is a disposable diaper mainly for newborns and infants, and is a low-weight infant having a weight of 3000 g or less, particularly a low birth weight of less than 2500 g. Suitable for weight children. Low-weight infants include not only low birth weight infants (weight less than 2500 g) but also extremely low birth weight infants (weight less than 1500 g) and very low birth weight infants (weight less than 1000 g).

  FIG. 1 is a developed plan view of the diaper 1. 2A to 2C are exploded explanatory views of each part of the diaper 1. FIG. FIG. 2A is an exploded explanatory view of the front portion 3. FIG. 2B is an exploded explanatory view of the crotch portion 5. FIG. 2C is an exploded explanatory view of the rear portion 7.

  The diaper 1 of this embodiment is a so-called open-type disposable diaper, and has a front part 3, a crotch part 5, and a rear part 7, as shown in FIG. The front part 3 is a part which will be located in a wearer's front part (abdominal side, front trunk periphery). Moreover, the rear part 7 is a part which will be located in a wearer's rear part (back side, back trunk periphery). The crotch part 5 is a part that is located between the front part 3 and the rear part 7.

  In the following description, each direction is defined as shown in FIG. That is, the direction from the front part 3 toward the rear part 7 is referred to as “product longitudinal direction L”, and the direction orthogonal to the product longitudinal direction L is referred to as “product width direction W”. CL shown in FIG. 1 is a line indicating the center of the diaper 1 in the product longitudinal direction L. Further, as shown in FIG. 2, the direction perpendicular to the product longitudinal direction L and the product width direction W is defined as “thickness direction”, the wearer's skin side is defined as “skin side”, and the opposite side is defined as “non-skin”. Side ".

  The diaper 1 has a central strip region 12, side flaps 14, leg side gathers 16, and waist gathers 18. A fastening tape 30 is attached to each of the pair of side flaps 14.

  The central belt-like region 12 is a belt-like region located at the center of the product width direction W, which is constituted by the front part 3, the crotch part 5 and the rear part 7 (see FIG. 1). The central belt-like region 12 is a part that absorbs and holds liquid such as urine excreted by the wearer. The center strip region 12 has a vertically long shape (a shape along the product longitudinal direction L) including the liquid-retaining absorbent 21. The center strip region 12 mainly includes an absorbent body 21, a top sheet 22, a leak-proof sheet 23, and a back sheet 24 (see FIGS. 2A to 2C).

  The absorbent body 21 is a member formed by laminating a liquid absorbent material capable of absorbing excrement such as urine, and is disposed over the front part 3, the crotch part 5, and the rear part 7. The area displayed by the shaded portion in FIG. 1 indicates the area occupied by the absorber 21. The absorber 21 has an hourglass shape in which the width at the center in the product longitudinal direction L is narrow. However, the shape of the absorber 21 is not limited to the shape shown in FIG. 1, and may be a simple rectangle. Moreover, the absorber 21 should just be provided in the crotch part 5 at least. The absorber 21 is disposed between the top sheet 22 and the leak-proof sheet 23. As a liquid absorptive material which constitutes absorber 21, liquid absorptive granular materials, such as liquid absorptive fibers, such as pulp fiber, and a superabsorbent polymer, for example, can be used. Moreover, liquid absorptive materials other than a liquid absorptive fiber and a liquid absorptive granular material may be included.

  In the crotch part 5 of the absorbent body 21, a pair of dart parts 211 f are formed near the front part 3 at both ends in the product width direction W. Similarly, a pair of dart portions 211b is formed near the rear portion 7 of both end portions in the product width direction W. The dart portions 211f and 211b are constricted portions in which the absorber 21 is cut out in a substantially fishing rod shape as shown in FIG. The shape of the dart portions 211f and 211b is not limited to the shape shown in FIG. Moreover, the absorbent body 21 is not cut out in the dart portions 211f and 211b, and the basis weight of the liquid absorbent material may be smaller than the other portions of the absorbent body 21. For example, the basis weight of the liquid absorbent material in the dart portions 211f and 211b may be 1/3 or less of the basis weight of other portions. In any case, the rigidity of the absorber 21 is lower in the dart portions 211f and 211b than in other portions. Thereby, while making it easy to bend the absorber 21 in the area | region of the said dart part, making the diaper 1 round and three-dimensionally easily according to a wearer's body (crotch part), and the fit at the time of wearing the diaper 1 Can be improved.

  In the diaper 1, the position of the crotch 5 is set so that the center of the wearer's crotch coincides with the center of the crotch 5. The center part of the wearer's crotch is the center position of the base of the leg, and is a position shifted in the product longitudinal direction L from the center position CL of the diaper 1 to the front side (see FIG. 1). Since the center part of the crotch part 5 is on the front side of the center position CL of the diaper 1, the wearer can easily move the leg to the front side (abdominal side), and the area of the rear part 7 of the diaper 1 is relatively It is possible to cover the wearer's buttocks firmly.

  The top sheet 22 is a liquid-permeable member disposed on the skin side of the absorbent body 21. The leak-proof sheet 23 is a liquid-impermeable member disposed on the non-skin side of the absorber 21. The back sheet 24 is a member (exterior sheet) that constitutes the exterior of the diaper 1 on the non-skin side, and is composed of, for example, a nonwoven fabric. A back sheet 24 is disposed on the non-skin side of the leak-proof sheet 23 (see FIGS. 2A to 2C).

  In the crotch part 5 of the central strip region 12, an elastic film 25 is disposed between the absorber 21 and the back sheet 24. The stretchable film 25 is a member that imparts stretchability to the central strip region 12 of the crotch part 5. In the present embodiment, the stretchable film 25 is attached in a state of being stretched in the product longitudinal direction L. Thereby, the stretchable film 25 develops a contracting force along the product longitudinal direction L with respect to the crotch part 5 of the central belt-like region 12. When the diaper 1 is worn, the crotch part 5 contracts along the product longitudinal direction L, so that the central strip region 12 is rounded along the wearer's body, coupled with the dart portions 211f and 211b described above. 3D. As a result, the central belt-like region 12 is held in such a shape as to wrap the wearer's crotch portion, so that the excrement is prevented from leaking to the outside of the diaper 1 while improving the fit of the diaper 1. It becomes easy.

  The side flaps 14 are portions located on both sides of the central strip region 12 in the product width direction W. The side flap 14 is formed over the front part 3, the crotch part 5, and the rear part 7 (refer FIG. 1). The length (width) of the side flap 14 in the product width direction W in the crotch part 5 is narrower than the length (width) of the side flap 14 in the product width direction W in the front part 3 and the rear part 7. Further, the length wb in the product width direction W at the rear portion 7 of the side flap 14 is longer than the length wf in the product width direction W at the front portion 3 of the side flap 14 (see FIG. 1). The pair of side flaps 14 are respectively provided with leg gathers 15 (leg extension / contraction portions) that expand and contract along the product longitudinal direction L.

  The side flap 14 is mainly composed of a skin side sheet 26 and a back sheet 24 (see FIGS. 2A to 2C). The skin side sheet 26 is a skin side member formed over the front part 3, the crotch part 5 and the rear part 7, and is made of, for example, a nonwoven fabric. The skin side sheet 26 is also a member constituting the leg side gather 16 (three-dimensional gather), and a portion outside the skin side sheet 26 (a portion outside the joint portion 26A of the thick dotted line in FIG. 1) constitutes the side flap 14. To do.

  An elastic sheet 27 is disposed between the skin side sheet 26 and the back sheet 24 of the side flap 14. The elastic sheet 27 is a band-shaped member that expands and contracts along the product longitudinal direction L, and is a member that imparts stretchability to the leg opening when the diaper 1 is worn. That is, the elastic sheet 27 is a leg-around elastic sheet that fits the leg retraction part of the diaper 1 in accordance with the wearer's leg. Further, the leg gather 15 is configured by the elastic sheet 27 imparting stretchability to the skin side sheet 26 and the back sheet 24 of the crotch part 5. The elastic sheet 27 is made of, for example, a stretchable nonwoven fabric.

  The leg side gathers 16 are three-dimensional gathers for preventing liquid leakage from leg gaps. A pair of leg side gathers 16 is formed along the product longitudinal direction L over the front part 3, the crotch part 5, and the rear part 7 (refer FIG. 1). The leg side gathers 16 are formed so as to cover both edges of the central strip region 12 inside the side flaps 14.

  The leg side gathers 16 are mainly configured from a portion inside the skin side sheet 26 (see FIG. 2). The inner edge of the skin side sheet 26 of the crotch part 5 is stretchable by rubber thread or the like. The skin-side sheet 26 is joined along the product longitudinal direction L at the joint portion 26A between the central strip region 12 and the side flap 14 (thick dotted line in FIG. 1). A region inside the joint portion 26A of the skin side sheet 26 constitutes the leg side gather 16 (three-dimensional gather) with the joint portion 26A as a fulcrum.

  The waist gathers 18 are waistline stretchable parts arranged along the product width direction W in the rear part 7 (see FIG. 1). In the rear portion 7, a waist gather film 28 is disposed between the absorber 21 and the back sheet 24 (see FIG. 2C). The waist gather film 28 is a belt-like stretchable member that stretches along the product width direction W. The waist gathers 18 are configured by the waist gather film 28 imparting stretchability to the back sheet 24 and the like. The length of the waist gather film 28 in the product width direction W is longer than that of the absorber 21. For this reason, the waist gathers 18 are formed so as to protrude from the absorber 21 to the outside in the product width direction W. The West Gather 18 may not be provided.

  The fastening tape 30 is attached to the side flap 14 of the rear part 7 (see FIG. 1). The fastening tape 30 is attached by a part of the fastening tape 30 being sandwiched between the skin side sheet 26 and the back sheet 24 constituting the side flap 14 (see FIG. 2C).

  A target tape 29 is provided on the front portion 3 (see FIG. 1). The target tape 29 is disposed on the non-skin side of the back sheet 24 of the front portion 3 (see FIG. 2A). The target tape 29 is a member that can be engaged with the fastening tape 30 and is formed of, for example, a nonwoven fabric. The target tape 29 constitutes a target area with which the fastening tape 30 is engaged. Instead of disposing the target tape 29 on the non-skin side of the back sheet 24, a target region may be formed on the outermost nonwoven fabric of the back sheet 24.

  The diaper 1 is worn by engaging the fastening tape 30 with the target tape 29. As will be described later, the fastening tape 30 can be engaged with the other fastening tape 30.

  The product length in the product longitudinal direction L of the diaper 1 for low-weight infants according to the present embodiment (dimensions in a state where the product is stretched without breaking in the longitudinal direction) is in the range of 210 to 330 mm. For example, the product length of a diaper 1 for a low birth weight infant with a weight of less than 2500 g is 310 mm, and the product length of a diaper 1 for an extremely low birth weight infant with a weight of less than 1500 g is 270 mm, and the weight is less than 1000 g. The product length of the diaper 1 for low birth weight infants is 230 mm.

  Moreover, the waist dimension of the diaper 1 for low weight infants of this embodiment is the range of 160-295 mm. The waist dimension is a dimension in a state in which the end of one fastening tape 30 is aligned with the end of the hook sheet region C of the other fastening tape 30 on the side flap 14 side and the product is stretched without any wrinkles. is there. That is, it is a dimension in a state where the product is extended in the width direction. For example, the waist dimension of the diaper 1 for a low birth weight infant is 273.5 mm, and the waist dimension of the diaper 1 for an extremely low birth weight infant less than 1500 g is 220 mm.

<About wearing diapers 1>
In an open-type disposable diaper, it is important to improve the fit of the leg opening and the waist opening so that excrement such as urine does not leak to the outside when worn. In particular, when the wearer is a low-weight infant, as shown in FIG. 3, it may be required to maintain a posture in which the back is curved in a C shape and the leg is strongly bent in an M shape. This posture is close to the posture of the fetus in the mother's body (fetal-like bending posture) and is easy to rest and is also called a “positioning posture”. In addition, in FIG. 3, although the positioning posture of the prone state is shown, there may be a sideways direction or a supine position. In such a positioning posture, a gap is likely to occur in the diaper leg retraction part.

  Therefore, it is required to have sufficient fit so that a gap does not occur in the leg retraction part. In this regard, in the diaper 1, the fitting property can be improved by adjusting the fixing position of the fastening tape at the time of wearing. Drawing 4 is a figure explaining the form of diaper 1 at the time of wear. FIG. 5 is a side view showing a state when the diaper 1 is worn.

  When wearing an open-type disposable diaper, a pair of fastening tapes 30 provided at both ends of the rear portion 7 of the side flap 14 (a rear protrusion portion 14b described later) are usually attached to the front portion 3 of the central strip region 12. A method of fixing around the waist of the wearer by engaging each with a target tape 29 provided on the non-skin side is common. On the other hand, in the diaper 1 of this embodiment, as shown in FIG. 4, one fastening tape 30 (the left side fastening tape in FIG. 4) is engaged with the target tape 29, and The other fastening tape 30 (the right side fastening tape in FIG. 4) can be further engaged. As described above, in the diaper 1, the length wb of the rear portion 7 of the side flap 14 in the product width direction W is longer than the length wf of the front portion 3 in the product width direction W (wb> wf). Since it becomes the structure which is easy to turn around to the part 3 side (wearer's stomach side), as FIG. 4 shows, it is easy to overlap and engage the other fastening tape 30 on one fastening tape 30. is there. By engaging the fastening tapes 30 in this manner, the rear band 7 side of the central belt-like region 12 and the side flaps 14 are pulled to the front part 3 as a whole, and the waist opening and the leg opening are formed. Fit is improved. Therefore, the clearance between the leg renditions is less likely to occur. Of course, when the diaper 1 is worn, the fastening tapes 30 may be engaged with the target tape 29 instead of engaging the fastening tapes 30 with each other.

  On the other hand, the improvement in fit at the leg opening of the diaper 1 also means that tightening by the leg opening is larger with respect to the wearer's leg. In the example of FIG. 5, the side flap 14 that forms the leg opening is pulled toward the wearer's abdomen (the front 3 side of the diaper 1), thereby increasing the tightening force at the leg opening. When the wearer moves his / her leg in this state, the end of the side flap 14 tends to bite into the wearer's groin around the region of the crotch 5 (the region represented by the hatched portion in FIG. 5) There is a possibility that the touch of the part may deteriorate. In the case of a low-weight infant whose skin is sensitive, tightening the inguinal region may cause blood flow to deteriorate and cause swelling or discomfort.

  Therefore, in the diaper 1 of the present embodiment, the side flaps 14 are configured so as to realize a good touch at the leg revolving part while improving the fit at the time of wearing. Hereinafter, a detailed configuration of the side flap 14 will be described.

<About the structure of the side flap 14>
FIG. 6 is a schematic plan view illustrating the configuration of the side flap 14 of the present embodiment. As described above, the side flap 14 of the present embodiment is a vertically long portion along the product longitudinal direction L, and is configured by the skin side sheet 26 and the back sheet 24. The region of the front portion 3 of the side flap 14 has a front protruding portion 14 f that protrudes outward in the product width direction W. Further, on the front side in the product longitudinal direction L of the front projecting portion 14f, a cutout portion 14fR that is cut out in a curved shape so as to protrude inward in the product width direction W is formed. Similarly, the area | region of the rear part 7 of the side flap 14 has the rear part protrusion part 14b protruded toward the outer side of the product width direction W. As shown in FIG. A fastening tape 30 is provided on the rear projecting portion 14b (see FIG. 1), and the rear projecting portion 14b is fixed to the front projecting portion 14f by the fastening tape 30 so as to overlap the front projecting portion 14f. Further, on the rear side of the product longitudinal direction L of the rear projecting portion 14b, a notched portion 14bR that is notched in a curved shape so as to protrude inward in the product width direction W is formed.

  An outer end region in the product width direction W between the front projecting portion 14f and the rear projecting portion 14b of the side flap 14 is an end edge portion 14Lg that forms a leg-hole opening of the diaper 1. The edge portion 14Lg of the present embodiment is formed from the front portion 3 to the rear portion 7 with the crotch portion 5 as the center, and has a plurality of convex portions that are convex outward in the product width direction W and concave outward in the product width direction W. The plurality of concave portions thus formed has a meandering shape that is alternately repeated in the product longitudinal direction L. In FIG. 6, a plurality of convex portions 145a and concave portions 145b are formed on the crotch portion 5 of the end edge portion 14Lg. Similarly, a plurality of convex portions 143a and concave portions 143b are formed on the front portion 3 of the end edge portion 14Lg, and a plurality of convex portions 147a and concave portions 147b are formed on the rear portion 7 of the end edge portion 14Lg.

  FIG. 7 is an enlarged view of the end edge portion 14Lg of the side flap 14. The end edge portion 14Lg has five convex portions 145a and five concave portions 145b in the region of the crotch portion 5. The convex portion 145a and the concave portion 145b each have a so-called R shape that draws a gentle curve with a predetermined curvature. For example, R = 6 mm to 10 mm. In the present embodiment, the five convex portions 145a are formed with the same curvature, and the five concave portions 145b are also formed with the same curvature. That is, the unevenness formed in the region of the crotch part 5 has the same shape. Moreover, the convex part 145a and the recessed part 145b are arrange | positioned so that it may become a linear positional relationship along the product longitudinal direction L, respectively. That is, in the region of the crotch portion 5 of the end edge portion 14Lg, the vertex positions of the five concave portions 145b are the same position in the product width direction W, and the same straight line along the product longitudinal direction L as shown in FIG. Located on the top. Similarly, the vertex positions of the five convex portions 145a are also the same position in the product width direction W, and are located on the same straight line along the product longitudinal direction L. As described above, the end edge portion 14Lg forms a meandering shape along the product longitudinal direction L in the crotch portion 5. In FIG. 7, the apex portion of the convex portion 145 a and the apex portion of the concave portion 145 b are formed so as to maintain a distance We from the product width direction W. The length of We is about 2 mm, for example. Further, the distance (interval) La5 between the two convex portions 145a adjacent to each other in the product longitudinal direction L is equal. That is, the meandering pitch of the end edge portion 14Lg in the crotch portion 5 is La5.

  In addition, the shape of the convex part 145a and the recessed part 145b, the number of arrangement | positioning, etc. are not restricted to the example shown by FIG.6 and FIG.7, It can change suitably according to the difference in the wearing object and size of the diaper 1. FIG. Moreover, the size of the two convex portions 145a adjacent to each other in the product longitudinal direction L or the size of the two concave portions 145b adjacent to each other in the product longitudinal direction L may be different.

  In FIG. 6, two convex portions 143a and two concave portions 143b are formed in the region of the front portion 3 of the end edge portion 14Lg. The convex portion 143a and the concave portion 143b have substantially the same configuration as the convex portion 145a and the concave portion 145b, respectively. However, in the region of the front part 3, the meandering shape by the convex part 143a and the concave part 143b may not be formed along the product longitudinal direction L. That is, the meandering shape of the end edge portion 14Lg with respect to the product longitudinal direction L may be inclined or bent. In the area | region of the front part 3, it represents with the distance (interval) La3 between the two convex parts 143a adjacent about the product longitudinal direction L (refer FIG. 7).

  Three convex portions 147a and three concave portions 147b are formed in the region of the rear portion 7 of the end edge portion 14Lg. In this region, the end edge portion 14Lg extends outward in the product width direction W as it goes to the rear side of the product longitudinal direction L, and has a meandering shape oblique to the product longitudinal direction L. That is, the width of the side flap 14 is made wider on the rear side in the product longitudinal direction L than the dart part 211b on the rear side formed in the absorber 21. This is because when the diaper 1 is worn, the area where the side flap 14 covers the wearer's buttocks in the region of the rear portion 7 is widened. In the diaper 1, the position of the crotch part 5 is set in accordance with the middle position of the wearer's crotch, and the dart part 211 b is provided at a position near the rear part of the crotch part 5. Therefore, the width of the side flaps 14 is narrower on the front side in the product longitudinal direction L than the dart part 211b, and the width of the side flaps 14 is increased on the rear side. ), It is possible to prevent the wearer's buttocks from protruding from the side flaps 14 on the rear side (region of the rear portion 7) while making it easier for the wearer to move the leg.

  As shown in FIG. 7, the three convex portions 147a and the concave portions 147b provided in the region of the rear portion 7 have different shapes (curvature and size). And the largest space | interval is represented by La7 among the distance (space | interval) between two adjacent convex parts 147a.

  An elastic sheet 27 is disposed inside the product width direction W of the end edge portion 14Lg of the side flap 14. The elastic sheet 27 is a belt-like stretchable member having a predetermined length (width) in the product width direction W and extending along the product longitudinal direction L, and is formed of a stretchable nonwoven fabric or the like as described above. ing. As shown in FIGS. 6 and 7, in this embodiment, the elastic sheet 27 is disposed at a position inside the product width direction W with respect to the recessed portion 145 b formed in the region of the crotch portion 5 of the end edge portion 14 </ b> Lg. ing. And the elasticity along the product longitudinal direction L is expressed with respect to the edge part 14Lg of the side flap 14 by joining to the skin side sheet | seat 26 grade | etc., In the state extended | stretched along the product longitudinal direction L. FIG. Therefore, when the diaper 1 is worn, the stretching force acts in the direction in which the leg opening is contracted.

  The elastic sheet 27 is linearly arranged along the product longitudinal direction L. That is, the elastic sheet 27 is disposed substantially in parallel with the end edge portion 14Lg of the side flap 14 in the region of the crotch portion 5. In FIG. 7, the distance between the position of the recess 145 b of the end edge portion 14 </ b> Lg and the position of the outer end portion of the elastic sheet 27 in the product width direction W is represented by a distance of Ws. The length of Ws is, for example, about 1 mm. Although details will be described later, in the diaper 1, by disposing the elastic member away from the end edge portion 14Lg, the feel of the leg recliner when the diaper 1 is worn can be further improved.

  In addition, the elastic sheet 27 is arranged linearly along the product longitudinal direction L, which means that the front end and the rear end of the elastic sheet 27 are arranged at substantially the same position in the product width direction W. That's what it means. With such an arrangement, when the diaper 1 is worn, the elastic sheet 27 extends from the position facing the wearer's belly side and back side toward the wearer's crotch. Then, the elastic sheet 27 contracts substantially uniformly along the leg opening of the diaper 1, so that the contraction force can easily be applied to the leg opening. Thereby, it is suppressed that the tightening of the leg retraction part of the diaper 1 becomes strong locally, and it becomes easy to implement | achieve favorable touch.

  The elastic sheet 27 is joined to the skin side sheet 26 on the skin side in the thickness direction, and joined to the back sheet 24 and the leak-proof sheet 23 on the non-skin side in the thickness direction. The leak-proof sheet 23 is a member that suppresses the urine excreted in the diaper 1 from being transmitted to the non-skin side, but the leak-proof sheet 23 is joined to the elastic sheet 27, so that It becomes difficult to produce a gap in Thereby, it becomes easy to suppress excrement, such as urine, from leaking from the leg retraction part when the diaper 1 is worn.

<About the feel of the leg roll of diaper 1>
Then, the influence which the structure of the side flap 14 has on the touch in the leg roll part of the diaper 1 is demonstrated.

  In the diaper 1, the fastening tape 30 can be engaged with each other as shown in FIG. 4 to improve the fit at the time of wearing, while the tightening force at the leg retraction portion is increased accordingly. did. In conventional diapers, a linear elastic member such as rubber thread is generally used as an elastic member that imparts stretchability to the leg retraction part. The pressure acting on the garment increases, which causes a sense of discomfort and discomfort when worn. On the other hand, in the diaper 1, since the belt-shaped elastic sheet 27 having a predetermined width is used as the elastic member of the leg retraction part, the tightening force acting on the wearer's leg is easily diffused. That is, the pressure can be reduced by widening the area where the tightening force acts on the wearer's leg, and biting into the leg retraction part can be suppressed to make it difficult for the wearer to feel uncomfortable.

  Furthermore, by forming the elastic sheet 27 in a band shape, it is possible to make it difficult to generate a gap between the leg opening and the wearer's leg when the diaper 1 is worn. For example, when the wearer is a low-weight child and takes the positioning posture described with reference to FIG. 3, the shape of the leg opening of the diaper 1 is complicatedly deformed. For this reason, if the elastic member provided in the leg opening is a linear member such as rubber thread, it may not be able to fit in a complicated deformation, and a gap may be easily generated in the leg revolving part. On the other hand, in the diaper 1, the contact area between the leg opening and the wearer's leg is widened by using a belt-like elastic member such as the elastic sheet 27, so that the leg opening is deformed in a complicated manner. Even if it is a case, it is easy to follow the said deformation | transformation and it becomes difficult to produce a clearance gap in a leg revolving part.

  Moreover, in the diaper 1, the discomfort at the time of diaper wear can be reduced by making the edge part 14Lg meander shape centering on the crotch part 5 of the side flap 14. FIG. In the conventional diaper, the edge part which forms a leg periphery opening part is cut in many cases so that it may draw a straight line or a gentle curve with a small curvature. Since the edge is a portion that becomes an “edge” in direct contact with the wearer's skin at the leg opening of the diaper 1, when an edge close to such a straight line is pressed against the skin, The shape is likely to remain as a mark as it is, causing discomfort and discomfort to the wearer. On the other hand, since the end edge portion 14Lg of the diaper 1 has a meandering shape having irregularities in the product width direction W, the length of the edge portion is longer than that in the case of a straight shape. Thereby, the force which acts on the edge part 14Lg is disperse | distributed, and a trace becomes difficult to remain on a wearer's skin.

  In the present embodiment, the elastic sheet 27 that exerts a stretching force on the leg opening is disposed away from the end edge portion 14Lg of the side flap 14, thereby expanding and contracting with respect to the edge portion of the end edge portion 14 </ b> Lg. The force is not easily affected. For example, the elastic sheet 27 is sandwiched between the skin side sheet 26 and the back sheet 24, and the overlap of the three sheets is collectively cut into a meandering shape so that the uneven portion of the edge portion 14Lg is formed. However, when the expansion / contraction force is applied, the end edge portion 14Lg may not be able to maintain the meandering shape. Specifically, when the diaper is worn, a contraction force in the product longitudinal direction L acts on the edge portion of the end edge portion 14Lg, so that the uneven portion rises in the thickness direction, or the convex portion contracts and becomes uneven. The difference may become small and the meandering shape may not be maintained. If the meandering shape cannot be maintained, it becomes difficult to disperse the force acting on the end edge portion 14Lg, and therefore, the wearer's skin is likely to have an edge mark. In contrast, in the diaper 1, as described with reference to FIG. 7, a gap of Ws is provided at least between the concave portion 145 b of the end edge portion 14 </ b> Lg and the elastic sheet 27. That is, the stretch force of the elastic sheet 27 is less likely to directly act on the end edge portion 14Lg. Thereby, a recessed part and a convex part become easy to maintain each shape, and it becomes easy to maintain a meandering shape also at the time of wearing of the diaper 1. FIG. In the diaper 1, the distance We in the product width direction W between the convex portion 145a and the concave portion 145b is larger than Ws (We> Ws). That is, a certain amount of space is secured between the convex portion 145a of the end edge portion 14Lg and the elastic sheet 27. By providing the interval, at least the convex portion 145a is less affected by the stretching force of the elastic sheet 27 than the concave portion 145b, and the concave-convex shape is more easily maintained. Thereby, when the diaper 1 is worn, it is possible to maintain the meandering shape while allowing the end edge portion 14Lg to have an elasticity that does not impair the fit of the leg opening, which is favorable. Can achieve a soft touch.

  Then, in the region of the crotch portion 5 of the end edge portion 14Lg, the expansion and contraction force by the elastic sheet 27 acts evenly by equalizing the pitch of the concavo-convex portions (represented by the interval La5 in the product longitudinal direction L in FIG. 7). Like to do. As a result, it is possible to suppress a local increase in tension at some of the convex portions 145a or 145b, and to cause problems such as tightening in some areas of the leg recliner when the diaper 1 is worn. It is difficult. Moreover, in the diaper 1, since the elastic sheet 27 is linearly arranged along the product longitudinal direction L and has a positional relationship parallel to the end edge portion 14Lg, a force is evenly applied to the end edge portion 14Lg. It has a structure that works easily.

  On the other hand, in the region of the rear portion 7 of the end edge portion 14Lg, the pitch La7 of the concavo-convex portions is made wider than La5. As described above, in the rear portion 7, the side flaps 14 extend outward in the product width direction W so as to increase the area covering the wearer's buttocks, and the elastic force by the elastic sheet 27 acts on the end edge portion 14Lg. It is hard to do. Therefore, compared with the area of the crotch part 5, even when the uneven pitch La7 is increased in the area of the rear part 7, the touch at the time of wearing is hardly deteriorated. Conversely, by increasing the uneven pitch La7, the curve of the edge portion that comes into contact with the wearer's buttocks becomes smooth, so that the touch at the buttocks can be made soft.

  Further, in the diaper 1, the outer end portion in the product width direction W of the leak-proof sheet 23 is located on the inner side in the product width direction W than the end edge portion 14 </ b> Lg of the side flap 14. In other words, a predetermined interval is provided between the end edge portion 14Lg of the side flap 14 and the outer end portion of the leak-proof sheet 23 in the product width direction W. In the case of FIG. 6, the position of the outer end portion of the leak-proof sheet 23 in the product width direction W is located near the middle portion of the elastic sheet 27 in the product width direction W. Since the leak-proof sheet 23 is a liquid-impervious sheet having a waterproof property, the material of the fabric is harder and softer than the skin-side sheet 26 or the back sheet 24 made of a nonwoven fabric or the like. When such a leak-proof sheet 23 is disposed in the region of the end edge portion 14Lg of the side flap 14, the leg retraction portion of the diaper 1 becomes hard and may cause a wearer to feel uncomfortable. However, in the present embodiment, since the leak-proof sheet 23 is arranged away from the end edge portion 14Lg, the region of the end edge portion 14Lg is kept soft by the nonwoven fabric or the like constituting the skin side sheet 26 or the back sheet 24, and the diaper The feel of the leg revolving part when 1 is worn can be made favorable.

  Further, the notch portion 14fR provided on the front protrusion 14f and the notch portion 14bR provided on the rear protrusion 14b with the side flaps 14 may deteriorate the feel of the wearer's trunk (abdomen). Can be suppressed. When the low-weight infant who is a person who wears the diaper 1 takes a positioning posture as shown in FIG. 3, both end portions of the side flap 14 in the product longitudinal direction L are just in contact with the abdomen. At this time, if the shape of the end portion is sharp, the corner portion of the side flap 14 hits the wearer's abdomen, resulting in poor touch. Therefore, in the diaper 1, by providing the notches 14fR and 14bR at the end portions, the corner portions of the side flaps 14 do not hit the abdomen, and the touch is improved. In addition, since the notches 14fR and 14bR are protruded inward, the fabric is prevented from popping out at the end when the diaper 1 is worn. Thereby, the touch around the waist can be made better.

=== Others ===
The above-described embodiments are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved without departing from the gist thereof, and it goes without saying that the present invention includes equivalents thereof.

  When the diaper 1 described in the above-described embodiment is worn, the diaper 1 is usually fixed to the wearer's waist with the front 3 on the abdomen and the rear 7 on the back. In contrast, the diaper 1 may be worn with the front portion 3 on the back side and the rear portion 7 on the ventral side. That is, the diaper 1 can be worn with the front and back reversed.

  If the wearer is a low-weight child, “minimum handling” may be required to avoid touching the body as much as possible and avoiding stress. In this minimum handling, for example, not only excrement does not leak from a disposable diaper, but also a stable posture is required to be moved as much as possible when changing the diaper. Therefore, when the low-weight infant who is a wearer is in a prone positioning posture as shown in FIG. 3, it is necessary to wear the diaper 1 without moving the body as much as possible. In this case, it is good to make the diaper 1 wear without changing a posture by making the front and back of the diaper 1 reverse and engaging and fixing the fastening tape 30 on the dorsal side of the low-weight child.

  In the diaper 1, the elastic sheet 27 that imparts stretchability to the leg opening is disposed straight along the product longitudinal direction L, and the positions of the front 3 side end and the rear 7 side end of the elastic sheet 27 are the product. It is the same position in the width direction W. Therefore, even when the diaper 1 is worn with the front and back reversed, the elastic force of the elastic sheet 27 acts equally on the leg opening, so that the feel of the leg retraction part of the diaper 1 is deteriorated. Absent. That is, even when the diaper 1 is worn with the front and back reversed, the functions described in the above-described embodiment are not easily impaired. Therefore, in the diaper 1, it is possible to achieve both the minimum handling and the good touch when worn (particularly the touch at the leg recliner).

1 disposable diapers (diapers),
3 front, 5 crotch, 7 rear,
12 Central strip area,
14 side flaps,
14b rear protrusion, 14bR notch,
14f front protrusion, 14fR notch,
14Lg edge,
143a / 145a / 147a convex portion,
143b / 145b / 147b recess,
15 Leg gathers,
16 Legside gathers, 18 West gathers,
21 absorber, 211f dart part, 211b dart part,
22 Top sheet, 23 Leak-proof sheet,
24 back sheet (exterior sheet), 25 stretchable film,
26 skin side sheet, 26A joint,
27 elastic sheet,
28 West Gather film, 29 Target tape,
30 Fastening tape

Claims (8)

A disposable diaper having a longitudinal direction and a width direction intersecting the longitudinal direction,
A central strip region containing an absorber that absorbs liquid;
Side flaps located on both sides in the width direction of the central strip region;
A belt-like leg-hole elastic sheet provided on the side flap and extending and contracting along the longitudinal direction;
Have
The edge portion on the outer side in the width direction of the side flap is a meandering portion in which convex portions that are convex outward in the width direction and concave portions that are concave in the outer side in the width direction are alternately repeated in the longitudinal direction. With
The leg-hole elastic sheet is disposed on the inner side in the width direction than the concave portion of the side flap ,
The side flap includes a front part located on the stomach side of the wearer when wearing the disposable diaper, a rear part located on the back side of the wearer, and a crotch part located between the front part and the rear part. And having
In the crotch part of the side flap, the distance between the two convex portions adjacent in the longitudinal direction is constant,
The largest distance between the two convex portions adjacent in the longitudinal direction at the rear portion of the side flap is the distance between the two convex portions adjacent in the longitudinal direction at the crotch portion of the side flap. Disposable diapers characterized by being wider than the distance . The disposable diaper according to claim 1,
The disposable diaper characterized in that the leg-holes elastic sheet is arranged linearly along the longitudinal direction. The disposable diaper according to claim 1 or 2,
The disposable diaper characterized in that a distance between the convex portion and the concave portion in the width direction is larger than a distance between the concave portion and an outer end portion in the width direction of the leg-hole elastic sheet. The disposable diaper according to any one of claims 1 to 3 ,
The disposable diaper characterized in that a length in the width direction at the rear portion of the side flap is longer than a length in the width direction at the crotch portion of the side flap. The disposable diaper according to any one of claims 1 to 4 ,
The absorbent body has a pair of dart parts with a basis weight of the liquid absorbent material smaller than that of the other part on the front side and the rear side in the longitudinal direction of the crotch part,
The disposable diaper characterized in that the rear part of the side flap is a region located on the rear side in the longitudinal direction with respect to the dart part provided on the rear side in the longitudinal direction of the crotch part. It is a disposable diaper in any one of Claims 1-5 ,
The disposable diaper characterized in that the front end portion in the longitudinal direction of the leg-hole elastic sheet and the rear end portion in the longitudinal direction of the leg-hole elastic sheet are at the same position in the width direction. The disposable diaper according to any one of claims 1 to 6 ,
The side flap is disposed between the liquid-permeable top sheet disposed on the skin side of the wearer, the back sheet disposed on the non-skin side of the wearer, and the top sheet and the back sheet. A liquid-impermeable leak-proof sheet,
The position of the width direction outer side edge part of the said leak-proof sheet | seat is the inside of the said width direction rather than the said recessed part of the said side flap, The disposable diaper characterized by the above-mentioned. The disposable diaper according to any one of claims 1 to 7 ,
The said side flap has the notch part which consists of the curve which becomes convex inside the said width direction in the front side edge part and rear side edge part of the said longitudinal direction, The disposable diaper characterized by the above-mentioned.

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