JP2017213425A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper which can be arranged along a bulge of an abdomen of a wearer, and suppress positional deviation and leakage.SOLUTION: An absorbent core arrangement area on which an absorbent core is arranged, comprises a low basis weight part 4) which is formed so that the absorbent core can be bent in a thickness direction. The low basis weight part extends in a product width direction on a front girth area. The disposable diaper comprises: a first stretchable member 11 which is arranged along the low basis weight part, and which is stretchable in the product width direction; and a second stretchable member 12 arranged on outside of a product longitudinal direction relative to the first stretchable member, and is stretchable in the product width direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a disposable diaper.

  Patent Document 1 includes a waist opening, and a pants type having a waist opening and a region that is located on the crotch region side than the waist opening and that contacts the iliac region from the wearer's iliac crest to the anterior iliac spine Disposable diapers are disclosed. In the disposable diaper of Patent Document 1, the pressure when wearing the waist opening is 0.3 to 1.1 kPa, and the pressure when wearing the portion that contacts the iliac region is 1.1 to 2.5 kPa. ing.

  The wearer, in particular, the infant whose abdominal circumference protrudes, has a region that contacts the iliac region not protruding than the abdomen where the waist opening abuts. For example, if the tightening pressure of the waist opening abutting on the abdomen is increased, the waist opening is gradually narrowed because the tightening pressure is high, and the waist opening is shifted down to a portion where the abdomen becomes thinner. There is. The disposable diaper of patent document 1 raises the clamping pressure of the site | part of the diaper corresponding to a wearer's iliac area | region, and does not raise the clamping pressure of a waist opening part, but slips down during wearing of a disposable diaper. To prevent.

JP 2006-61680 A

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

  An infant has an abdominal circumference that protrudes, and the region above (waist side) the iliac region of the infant is swollen more than the iliac region. As for the disposable diaper of patent document 1, the area | region of the waist opening part side rather than the area | region which contact | abuts to an iliac area | region is expanded-contracted in the width direction similarly to an iliac area | region, and is not arrange | positioned along the shape of the bulging belly. Sometimes. Because the region on the waist opening side of the region that contacts the iliac region is not arranged along the wearer's abdomen, the disposable diaper may be pulled down or the disposable diaper may be displaced due to the movement of the wearer There is.

  Then, this invention is made | formed in view of the above-mentioned subject, and it aims at providing the disposable diaper which can be arrange | positioned along a wearer's belly bulge and can suppress position shift and a leak. .

  The disposable diaper according to the present disclosure includes a front waistline region (front waistline region S1), a back waistline region (rear waistline region S2), and a crotch region (inseam region) located between the front waistline region and the rear waistline region. And a product longitudinal direction (product longitudinal direction L) from the front waistline region to the rear waistline region, and a product width direction (product width direction W) orthogonal to the product longitudinal direction, An absorbent core (absorbent core 4) extending across the crotch region and extending into the front waistline region and the rear waistline region, a waistline opening (waistline opening 21) into which a wearer's waist is inserted, and the wear A disposable diaper having a leg opening (leg opening 22) into which a person's leg is inserted, wherein the absorbent core is thick in an absorbent core arrangement region where the absorbent core is arranged Bend (low eye) formed so that it can bend in the direction Part 41) is formed, and the curved part extends in the product width direction in the front waistline region, is disposed along the curved part, and extends and contracts in the product width direction. A first stretchable member 11) and a second stretchable member (second stretchable member 12) that is disposed on the outer side in the product longitudinal direction than the first stretchable member and stretches in the product width direction. This is the gist.

  The disposable diaper which can be arrange | positioned along a wearer's belly bulge and can suppress position shift and a leak can be provided.

It is a perspective view of the disposable diaper concerning this embodiment. It is an expanded top view of the disposable diaper concerning this embodiment. It is sectional drawing of the disposable diaper along the AA line shown in FIG. It is a figure which shows the state which mounted | wore the disposable diaper which concerns on this embodiment. It is a figure which shows the state which mounted | wore the disposable diaper which concerns on this embodiment. It is a figure which shows typically the music part which concerns on a modification.

  Next, an embodiment of the disposable diaper 1 according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Accordingly, 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.

  FIG.1 and FIG.2 is a figure which shows the disposable diaper 1 which concerns on this embodiment. As shown in FIG. 1, the disposable diaper 1 is a pants-type disposable diaper.

  The disposable diaper 1 according to the present embodiment corresponds to the front waistline region S1 disposed on the abdomen side of the wearer, the rear waistline region S2 disposed on the back side of the wearer, and the inseam of the wearer. A crotch region S3 located between the region S1 and the rear waistline region S2.

  The disposable diaper has a product longitudinal direction L extending to the wearer's body front side and the body rear side, a product width direction W orthogonal to the product longitudinal direction, and a product thickness direction T. The product thickness direction T is an inner direction (the wearer's skin contact surface side) T1 toward the wearer, and an outer direction (the wearer's non-skin contact surface) toward the opposite side (the side away from the wearer). Side) T2.

  The disposable diaper 1 includes an absorbent main body 1A and an exterior body 1B. The absorbent main body 1A is disposed across the front waistline region S1 and the rear waistline region S2. The absorbent main body 1 </ b> A is less than the liquid-permeable top sheet 2, the liquid-impermeable back sheet 3, the absorber 4 disposed between the top sheet 2 and the back sheet 3, and the back sheet 3. It has the main body exterior sheet 5 located on the skin contact surface side.

  The outer package 1B is arranged in the outer direction T2 with respect to the absorbent main body 1A. The exterior body is disposed in each of the front waistline region S1 and the rear waistline region S2, and is disposed around the waist of the wearer. The exterior body 1B has an exterior sheet 13.

  FIG. 2 is a developed plan view showing a state in which the disposable diaper shown in FIG. 1 is developed. The development plan view shown in Drawing 2 is a figure of the extension state which extended the elastic member etc. to the state where the heel of the member (exterior sheet etc.) which constitutes disposable diaper 1 is not formed. FIG. 3 is a cross-sectional view of the disposable diaper 10 along the line AA shown in FIG.

  From the state shown in FIG. 2, starting from the center in the product longitudinal direction L, the front end of the front waistline region S1 and the rear end of the rear waistline region S2 are overlapped with the skin contact surface of the disposable diaper inside. The pants-type disposable diaper shown in FIG. 1 is formed by folding and joining the outer end in the product width direction W of the front waistline region S1 and the outer end in the product width direction of the rear waistline region S2. FIG. 1 shows a side joint portion 30 in which the outer end portion in the product width direction W of the front waistline region S1 and the outer end portion in the product width direction of the rear waistline region S2 are joined.

  The disposable diaper 1 is formed with a waist opening 21 into which the wearer's waist is inserted and a pair of leg openings 22 into which the wearer's legs are respectively inserted. The waist opening 21 is surrounded by the front end and the rear end of the exterior body 1B.

  The topsheet 2 constituting the absorbent main body 1A is located on the inner side (the wearer side) than the absorbent body 4. As the top sheet 2, a liquid permeable sheet such as a nonwoven fabric or an apertured plastic film is used.

  The back sheet 3 constituting the absorbent main body 1A is disposed on the outer side of the absorbent body 4 and on the inner side of the exterior body 1B. A liquid-impermeable sheet or the like is used for the back sheet 3.

  The absorbent body 4 constituting the absorbent main body 1A is provided between the top sheet 2 and the back sheet 3 and absorbs excrement from the wearer. The absorbent body 4 has an absorbent core 4a made of an absorbent material such as pulverized pulp or superabsorbent polymer particles, and a core wrap 4b that wraps the absorbent core 4a.

  The exterior sheet 13 constituting the exterior body 1B is disposed on the outer side with respect to the absorbent main body located in the front waistline region, and is disposed on the outer side with respect to the absorbent main body located in the rear waistline region. In addition, an exterior sheet | seat contacts a wearer's skin in the area | region where an absorptive main body is not arrange | positioned in the area | region where an absorptive main body is not arrange | positioned in a front waistline area, and a back waistline area.

  The exterior sheet 13 can be constituted by a hydrophobic nonwoven fabric, a moisture-permeable or moisture-impermeable film, or a composite sheet obtained by bonding a hydrophobic nonwoven fabric and a moisture-permeable or moisture-impermeable film.

  In the absorbent core arrangement region RA in which the absorbent core of the disposable diaper is arranged, a bent portion is formed so that the absorbent core can be bent in the product thickness direction T. The curved portion is configured by a low weighted portion 41 in which an absorbent core is not disposed in the absorbent body. The low basis weight portion 41 is a portion where the basis weight of the absorbent material (particularly, fiber material such as pulverized pulp) is lower than the region other than the low basis weight portion in the absorbent core arrangement region RA. The absorptive core is configured to bend easily with a low basis weight as a deformation base point. In FIG. 2, the absorbent core arrangement region RA is indicated by hatching.

  The low basis weight can be confirmed by holding the disposable diaper on the light table in an unfolded / extended state and seeing through the portion. The low weight part is brighter than the surroundings (can transmit light). According to this method, the low weight area can be confirmed by visual observation. In addition, the said method can be used suitably especially in the low fabric weight part with a low fabric weight of a pulp. Or, cut out the target part so that the area can be measured from the disposable diaper and as large as possible, and measure the weight after excluding the core wrap sheet and other than the absorbent material to confirm the low weight area It becomes possible.

  In addition, a curved part should just be the composition used as a modification base point where an absorptive core bends in the thickness direction. Peripheral absorbent core weight per unit area, absorbent core per unit thickness boundary, absorptive core perimeter thickness different thickness, absorptive core perimeter absorbent core density density part, and product width It is comprised including at least one among the expansion-contraction parts which expand-contract in a direction.

  The disposable diaper has a plurality of stretchable members. The stretchable member includes a first stretchable member 11 and a second stretchable member 12. The second stretchable member 12 is disposed along the waist opening 21 and stretches in the product width direction W. The second elastic member 12 is disposed on the outer side in the product longitudinal direction L than the first elastic member 11 and expands and contracts in the product width direction W. It is preferable that the 2nd elastic member 12 is arrange | positioned in the product longitudinal direction L outer side rather than the 1st elastic member, and is arrange | positioned in the product longitudinal direction L outer side rather than an absorptive core. More preferably, it is preferable that the 2nd elastic member 12 is arrange | positioned in the product longitudinal direction L outer side rather than the 1st elastic member, and is arrange | positioned in the product longitudinal direction L outer side rather than an absorptive main body.

  The 1st elastic member 11 is arrange | positioned along the low weight part 41 which is a curved part, and expands-contracts at least in the product width direction. The 1st elastic member 11 is arrange | positioned at the exterior sheet | seat 13 which comprises the exterior body 1B. Specifically, the exterior sheet 13 is folded in the product longitudinal direction starting from the waist opening 21 of the disposable diaper, and the first stretchable member 11 is disposed between the folded exterior sheets. .

  In addition, the 1st elastic member 11 should just be arrange | positioned in the vicinity of the low fabric weight part 41, and the arrangement | positioning is not limited. For example, the 1st elastic member 11 may be arrange | positioned between the absorber 4 and the back surface sheet 3, may be arrange | positioned in the absorber 4, and may be arrange | positioned in the exterior body 1B. Good.

  The length of the first elastic member 11 in the product width direction is not limited to the embodiment. The length of the first elastic member 11 in the product width direction may be longer than the length of the absorbent core in the product width direction, may be shorter than the length of the low weight portion in the product width direction, or absorbs. It may be longer than the length of the product main body in the product width direction, may be the entire region of the front waistline region, and, as shown in FIG. It may be divided at the center.

Preferably, the first elastic member 11 is at least partially disposed so as to overlap the absorbent main body 1 </ b> A in a plan view and reach the side joint 30. When the first elastic member 11 reaches the side joint portion 30 from the absorbent main body 1A, the intended effect of the present invention is exhibited, and further, the first elastic member 11 continues to function even when the wearer's movement is added. It becomes possible.
Further, the shape of the first stretchable member 11 in plan view may be linear or curved. The shape of the first stretchable member 11 in plan view may be such that the center in the product width direction is convex toward the crotch region, or may be a straight shape parallel to the product width direction.

  In addition, the state in which the first elastic member 11 is disposed along the low weight part 41 is not only the state in which the first elastic member 11 and the low weight part 41 are disposed in parallel, but also the low weight part 41. Includes a state in which the low basis weight 41 and the first stretchable member 11 are not parallel to each other.

  The second elastic member 12 is disposed along the waist opening 21 on the outer side in the product longitudinal direction than the first elastic member 11. The 2nd elastic member 12 is arrange | positioned at the exterior sheet | seat 13 which comprises the exterior body 1B. Specifically, the exterior sheet 13 is folded in the product longitudinal direction starting from the waist opening 21 of the disposable diaper, and the second stretchable member 12 is disposed between the folded exterior sheets. . The 1st elastic member 11 and the 2nd elastic member 12 are spaced apart and arrange | positioned in the product longitudinal direction.

  In addition, the 2nd elastic member 12 should just be arrange | positioned in the product longitudinal direction outer side rather than the 1st elastic member, The arrangement | positioning is not limited. For example, the 2nd elastic member 12 may be arrange | positioned at the surface at the non-skin contact surface side of the exterior sheet 13, and may be arrange | positioned at the absorptive main body.

  The length in the product longitudinal direction of the second elastic member 12 may be longer than the length in the product width direction of the absorbent core as in the embodiment, but is not limited to the embodiment. The length of the second elastic member 12 in the product width direction may be shorter than the length of the absorbent main body in the product width direction, or may be longer than the length of the absorbent main body in the product width direction.

  The elongation ratio of the first region R1 in which the first elastic member is disposed is higher than the expansion ratio of the second region R2 in which the second elastic member is disposed. In FIG. 2, the first region R1 and the second region R2 are shown surrounded by a two-dot chain line. The region having a high expansion / contraction rate is contracted more than the region having a low expansion / contraction rate, and the length thereof is shorter than the state before contraction. By shortening the length of the first region R1 in which the first stretchable member is disposed, the first stretchable member 11 can be disposed in the recess at the boundary between the wearer's middle abdomen and the lower abdomen. On the other hand, since the expansion / contraction rate of the second region on the waist side relative to the first region R1 is relatively low, the disposable diaper can be fitted to the wearer's abdomen without overtightening the wearer's abdomen.

  The expansion / contraction rate means the degree of expansion / contraction in the contraction direction, and is defined as follows.

Expansion rate = (length in the shrinking direction of the measurement region in the maximum stretched state) / (length in the shrinking direction of the measurement region in the natural state)
In addition, in this specification, this expansion / contraction rate shall be measured as follows, for example.

  First, when the disposable diaper is enclosed in a package or the like, the disposable diaper is removed from the package and left in that state for 60 minutes in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH. Then, the length of the measurement region (for example, the first region R1) is measured along the contraction direction. This length is referred to as “the length of the measurement region in the natural state (for example, the first region R1)”.

  Second, the length in the contraction direction of the desired region in such a state (that is, the natural state), and the length in the contraction direction of the measurement 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 measurement region (for example, the first region R1) in the extended state”.

  Using these measurement results, the expansion / contraction rate is measured by calculating with the above formula.

  The first elastic member 11 is made of rubber thread, and the second elastic member 12 is made of an elastic sheet. For example, as the thread rubber, a thread-like / strip-like elastic member made of polyurethane elastic fiber or natural rubber can be used, and one or a plurality of the thread-like / strip-like elastic members may be arranged. In addition, as such an elastic sheet, a thermoplastic elastomer resin such as urethane or styrene is melted to form a film, an elastic nonwoven fabric made of elastic fibers, an elastic film or an elastic nonwoven fabric. A composite sheet obtained by laminating a non-stretchable sheet that has been cut or embrittled, a nonwoven fabric sheet that exhibits stretchability by subjecting the nonwoven fabric to gear stretching, and the like can be used.

  Further, instead of the stretchable sheet, the first stretchable member 11 and the second stretchable member 12 are configured by arranging one or a plurality of thread-like / strip-like elastic members made of polyurethane elastic fiber or natural rubber. May be.

  Next, the configuration of the front waistline region S1 will be described in detail. The front waistline region is configured by the exterior body 1B and a part of the absorbent main body 1A. The exterior sheet 13 constituting the exterior body 1B is disposed over the entire front waistline region.

  The second stretchable member 12 is disposed away from the absorbent main body on the outer side in the product longitudinal direction of the absorbent main body 1A. The second region R2 where the second stretchable member 12 is disposed is stretched in the product width direction by the second stretchable member 12. Moreover, 1st area | region R1 in which the 1st elastic member 11 is arrange | positioned is an area | region including the low fabric weight part 41, and shrink | contracts in the product width direction with the 1st elastic member 11. FIG. The first region includes a low-weight portion where the absorbent core is not disposed, and has a lower rigidity than the periphery of the absorbent core placement region. Therefore, the first region is likely to act with high stretching stress due to the first stretchable member 11. The stretch stress in the first region is set to be higher than the stretch stress in the second stretch region.

  Next, a wearing state of the disposable diaper will be described based on FIGS. 4 and 5. FIG. 4 is a perspective view showing a state where the disposable diaper 1 is mounted. FIG. 5 is a cross-sectional view showing a state in which a disposable diaper is mounted. FIG. 5 is a diagram schematically showing the circumference of the wearer's stomach on the basis of the BB cross section shown in FIG. 4. The illustrated alternate long and two short dashes line indicates the wearer's body line. In FIG. 5, the entire exterior body is omitted by a single line.

  In a state where the disposable diaper is attached to the wearer, a front waistline region and a back waistline region are disposed along the waistline of the wearer. Since the 2nd elastic member 12 is arrange | positioned along the waist opening 21 at this time, the waist opening 21 of a disposable diaper closely_contact | adheres to a wearer's waist.

  Since the curved portion extending in the product width direction is formed in the front waistline region, the absorbent core in the front waistline region is bent in the product thickness direction along the product width direction. Moreover, since the 1st elastic member 11 extended in a product width direction along the curved part is arrange | positioned, a curved part closely_contact | adheres to a body. In addition, the stretching force of the first region is higher than the stretching force of the second region located on the outer side in the product longitudinal direction than the low basis weight portion 41. Therefore, the curved portion can be deformed from the base point, and the region located on the outer side in the longitudinal direction from the curved portion can be raised in the direction away from the body.

  Thus, since the absorbent body stands on the non-skin contact surface side with the curved portion as a base point, by bringing the first elastic member 11 and the curved portion into contact with the boundary between the middle abdomen and the lower abdomen of the wearer, The front waist area of the disposable diaper can be arranged along the belly bulge.

  By disposing the disposable diaper along the wearer's belly, the disposable diaper can be disposed along the body even when the wearer moves, and the problem that the disposable diaper is pulled down and the problem that the disposable diaper is displaced can be suppressed. Moreover, when maintaining the state which covered the stomach of the infant, since it does not tighten with excessive expansion-contraction resistance, the pressure to a wearer's built-in can be suppressed and a discomfort can be suppressed.

  Since the stretch ratio of the first region R1 where the first stretch member is disposed is relatively high, the first region R1 is further contracted, and the first stretch property is formed in the recess at the boundary between the wearer's middle abdomen and lower abdomen. The member 11 can be arranged. On the other hand, since the expansion / contraction rate of the second region on the waist side relative to the first region R1 is relatively low, the disposable diaper can be fitted to the wearer's abdomen without overtightening the wearer's abdomen.

  Generally, an infant has an abdomen around the abdomen, the middle part above the infant's lower abdomen (waist side) is swollen more than the lower abdomen, and the boundary between the middle part and the lower part of the abdomen is recessed. Yes. In a state where the disposable diaper is attached to the wearer, the low-weighted portion 41 that is a curved portion is arranged corresponding to the boundary between the wearer's mid-abdomen and lower-abdomen, and the second region R2 is the wearer's mid-abdomen It is arranged corresponding to. The second elastic member can fit the disposable diaper to the wearer's middle abdomen, and the first elastic member can fit the disposable diaper to the boundary between the wearer's lower abdomen and middle abdomen. Can be placed along the bulge.

  Further, the low basis weight 41 has a curved shape protruding from the outer end portion in the product width direction toward the crotch region side toward the center in the product width direction. The bulge of the wearer's belly is larger at the center in the width direction than at the side. Therefore, it is desirable that the region where the center of the disposable diaper in the product width direction abuts is wider than the region where the product width direction outer end of the disposable diaper abuts on the non-skin contact surface side.

  Since the low basis weight portion 41 protrudes toward the crotch region side from the outer end portion in the product width direction toward the product width direction center, the deformation base point of the absorbent core in the product width direction center is located on the crotch side, The area raised on the non-skin contact surface side becomes wider. Therefore, it is possible to form a cup shape that covers the abdomen by three-dimensionally raising the region on the outer side in the product longitudinal direction from the low basis weight 41.

  The shape of the low weight portion 41 in plan view may be a curved shape or a linear shape extending in the product width direction.

  Furthermore, the 1st elastic member 11 and / or the 2nd elastic member 12 are the curve shape which protruded in the crotch region side toward the product width direction center from the product width direction outer side edge part. The bulge of the wearer's belly is larger at the center in the width direction than at the side. Therefore, it is desirable that the region where the center of the disposable diaper in the product width direction abuts is wider than the region where the product width direction outer end of the disposable diaper abuts on the non-skin contact surface side.

  Since the first stretchable member 11 and / or the second stretchable member 12 protrudes from the outer end of the product width direction toward the crotch region toward the center in the product width direction, the deformation base point of the absorbent core at the product width direction center Is located on the crotch side, and a region that rises toward the non-skin contact surface side in the center in the product width direction is widened. Therefore, it is possible to form a cup shape that covers the abdomen by three-dimensionally raising the region on the outer side in the product longitudinal direction from the first elastic member 11 and / or the second elastic member 12.

  In the extended state of the disposable diaper, the distance L1 between the front end portion of the disposable diaper and the curved portion in the imaginary line that passes through the center of the disposable diaper in the product width direction and extends in the product longitudinal direction is 40 mm or more and 80 mm or less. Is desirable.

  The wearing assistant (mother) tends to pull up the front end of the disposable diaper, using the position where the wearer's navel is covered or hidden as a guide. For this reason, it has been found that the arrangement of the bent portion between the middle abdomen and the lower abdomen of the wearer is facilitated by the arrangement in the size range. For example, if the distance L1 between the front end portion of the disposable diaper and the curved portion is less than 40 mm, the area of the disposable diaper arranged on the outer side in the product longitudinal direction is narrower than the boundary between the middle abdomen and the lower abdomen. The mid-abdomen may not be properly covered. On the other hand, if the distance L1 between the front end portion of the disposable diaper and the curved portion is longer than 80 mm, the position of the front end portion of the disposable diaper increases, and when the wearer bends the body, from the front end portion of the disposable diaper The area up to the curved part hits the middle abdomen and may hinder movement.

  Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

  FIG. 6 is a diagram illustrating a curved portion according to a modification. The curved portion 42 shown in FIG. 6A is a portion where the length of the absorbent core in the product width direction changes in the product longitudinal direction. The length on the product longitudinal direction outer side than the curved part 42 is longer than the length on the product longitudinal direction inner side than the curved part. The parts of the absorbent core having different lengths in the product width direction are different in rigidity of the absorbent core, and are configured to be easily deformed from the part as a base point.

  A curved portion 43 shown in FIG. 6B is a notch formed in the absorbent core. The portion where the notch of the absorbent core is formed has a lower rigidity than the portion around the notch of the absorbent core, and is configured to be easily deformed from the portion as a base point.

  The curved part 44 shown in FIG.6 (c) is a pressing part which pressed the absorptive core in the thickness direction. The part in which the pressing part is formed has higher rigidity than the part around the pressing part of the absorbent core, and is configured to be easily deformed from the part as a base point.

  Note that the curved portion is not limited to this configuration, and in the absorbent core, the basis weight part having a different basis weight from the surrounding absorbent core, the thickness boundary part having a thickness different from the surrounding absorbent core in the absorbent core, and the absorbent core What is necessary is just to be comprised by either the density boundary part from which a surrounding absorptive core differs in density, the expansion-contraction part which expands-contracts in the product width direction, and the part which performed the folding process on the disposable diaper. In addition, a folding process is a process which bends a disposable diaper itself in a curved part in the manufacturing process of a disposable diaper. By performing the folding process, a crease can be formed in the absorbent core in a state of being enclosed in a package or in a state of being taken out. The fold line functions as a curved portion.

  For example, the disposable diaper may be a so-called tape-type disposable diaper that is not previously formed into a pants shape. The tape-type disposable diaper is provided with a fastening tape in a rear waistline region, and a target portion to which the fastening tape is fixed in a front waistline region. The disposable diaper is held along the wearer's waist by the engagement between the fastening tape and the target portion.

  The portion extending in the product width direction from the region where the fastening tape engaging member is provided serves as a waistline holding portion that is held around the waist of the wearer by the engagement between the fastening tape and the target portion. This waistline holding part should just be provided in the waist opening part side rather than the curved part, More preferably, it is provided adjacent to the curved part. According to such a configuration, the vicinity of the curved portion can be fitted around the wearer's waist, and the region on the outer side in the product longitudinal direction from the curved portion can be arranged along the bulge of the wearer's belly.

  Moreover, although the 1st elastic member 11 may overlap with the curved part in the product thickness direction, it may be arrange | positioned and shifted | deviated from the curved part to the product longitudinal direction outer side or the product longitudinal direction inner side. Moreover, as a preferable modification, it is desirable that the first stretchable member is disposed adjacent to the curved portion on the outer side in the product longitudinal direction than the curved portion. By disposing the first stretchable member on the outer side in the product longitudinal direction from the curved portion and adjacent to the curved portion, the first stretchable member can lift the region on the product longitudinal direction outside the curved portion.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

1: Disposable diaper 1A: Absorbent main body 1B: Exterior body 2: Top sheet 3: Back sheet 4: Absorbent body 4a: Absorbent core 4b: Core wrap 5: Main body exterior sheet 11: First stretchable member 12: Second stretch Sex member 13: exterior sheet 21: waist opening 22: leg opening 30: side joint 41: low weight (curved part)
42: curved portion 43: curved portion 44: curved portion R1: first region R2: second region RA: absorbent core placement region S1: front waistline region S2: rear waistline region S3: crotch region L: product longitudinal direction T: Product thickness direction W: Product width direction

Claims (8)

A front waistline region, a back waistline region, and a crotch region located between the front waistline region and the back waistline region;
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,
An absorbent core extending across the crotch region and extending to the front waistline region and the rear waistline region;
A waist opening into which the wearer's waist is inserted;
A disposable diaper comprising: a leg-hole opening into which the wearer's leg is inserted;
In the absorbent core arrangement region where the absorbent core is arranged, a bent portion is formed so that the absorbent core can be bent in the thickness direction,
The curved portion extends in the product width direction in the front waistline region,
A first stretchable member disposed along the curved portion and stretchable in the product width direction;
A disposable diaper comprising: a second stretchable member that is disposed outside the first stretchable member in the product longitudinal direction and stretches in the product width direction.   The disposable diaper according to claim 1, wherein a stretch rate of the first region in which the first stretchable member is disposed is higher than a stretch rate of the second region in which the second stretchable member is disposed. The curved portion is arranged corresponding to a boundary between the wearer's mid-abdomen and lower abdomen,
The disposable diaper according to claim 2, wherein the second region is disposed corresponding to a middle part of the wearer.   The curved part is a notch formed in the absorbent core, a compressed part obtained by pressing the absorbent core in a thickness direction, a basis weight part having a basis weight different from that of the surrounding absorbent core in the absorbent core, the absorption At least among the thickness boundary part having a thickness different from that of the surrounding absorbent core in the absorbent core, the density boundary part having a density different from that of the surrounding absorbent core in the absorbent core, and the stretchable part extending and contracting in the product width direction. The disposable diaper in any one of Claims 1-3 currently formed including either.   The disposable diaper according to any one of claims 1 to 4, wherein the first stretchable member is disposed adjacent to the curved portion on the outer side in the product longitudinal direction than the curved portion.   The disposable diaper according to any one of claims 1 to 5, wherein the curved portion projects toward the crotch region from the outer end in the width direction toward the center in the width direction.   The disposable diaper according to any one of claims 1 to 6, wherein the first stretchable member protrudes toward the crotch region from the outer end in the width direction toward the center in the width direction.   In the extended state of the disposable diaper, the distance between the front end portion of the disposable diaper and the curved portion in the imaginary line that passes through the product width direction center of the disposable diaper and extends in the product longitudinal direction is 40 mm or more and 80 mm or less. The disposable diaper according to any one of claims 1 to 7, wherein