JP2017113187A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper capable of reducing skin trouble such as the eczema, sudamina, and rash by quickly transferring absorbed perspiration to a surface not facing a skin.SOLUTION: A disposable diaper 1 according to the present invention includes abdominal-side waist flaps FA and back-side waist flaps FB that are located outward from front/rear ends 23A and 23B in a longitudinal direction X of an absorber 23 and extending in a lateral direction Y. Each back-side waist flap FB includes a hydrophobic skin-side sheet 4 and a hydrophilic non-skin-side sheet 5. The skin-side sheet 4 includes recessed parts 41 recessed in the non-skin-side sheet 5 side, and apertures 44 penetrating through the skin-side sheet 4 in the recessed parts 41. The thickness of the recessed part 41 of the skin-side sheet 4 becomes smaller towards the aperture 44.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a disposable diaper.

  2. Description of the Related Art Conventionally, disposable diapers are known in which a sheet or the like that absorbs sweat is provided on the surface of a disposable diaper that touches the skin to effectively prevent the occurrence of eczema, rash, rash, and the like (for example, Patent Document 1).

  In Patent Document 1, in order to absorb sweat, a hydrophobic first fiber nonwoven fabric is superposed on the skin contact side and a hydrophilic second fiber nonwoven fabric is superposed on the skin non-contact side at a heat fusion part. A disposable diaper in which a fixed composite sheet is provided on an end flap and a side flap is disclosed. Patent Document 1 describes that a large number of apertures that penetrate the first fiber nonwoven fabric of the composite sheet are provided.

  As a technique different from this, the present applicant has previously described that the exterior body constituting the pants-type disposable diaper is formed by juxtaposing the cylindrical portions extending in the vertical direction in the width direction. A pants-type disposable diaper in which a plurality of apertures connected to the inside of the cylindrical portion are intermittently formed in the longitudinal direction on the convex portion of the sheet disposed on the skin contact surface side constituting the skirt (for example, Patent Document 2).

JP 2004-298467 A JP 2011-78477 A

  However, the disposable diaper described in Patent Document 1 is formed in a state in which the fiber form of the constituent fibers is maintained in order to transfer sweat from the heat-sealed portion by capillary action. In the heat-sealed part formed in such a state that the fiber form of the constituent fibers is maintained, the thickness of the peripheral part thereof cannot be sufficiently reduced, the capillary phenomenon is unstable, and the opening part is not formed. Can't pass and absorb enough sweat.

  Further, Patent Document 2 does not describe anything about the thickness of the peripheral portion of the opening formed in the exterior body.

  Therefore, this invention is providing the disposable diaper which can eliminate the fault which the prior art mentioned above has.

  The present invention includes a ventral region and a dorsal region in the vertical direction, and a crotch region positioned therebetween, and has an absorber over the ventral region and the dorsal region, and the absorber A disposable diaper having an abdominal waist flap and a back side waist flap that are located outward from the longitudinal front and rear end portions and extend in the lateral direction, and at least the back side waist flap forms a skin contact surface A hydrophobic skin-side sheet, and a hydrophilic non-skin-side sheet positioned on the non-skin-facing surface side of the skin-side sheet, the skin-side sheet recessed toward the non-skin-side sheet side A plurality of indentations and an opening that penetrates the skin-side sheet in each indentation, and the indentation of the skin-side sheet becomes smaller as the thickness approaches the opening. A disposable diaper is provided.

  According to the present invention, absorbed sweat can be quickly transferred to the non-skin facing surface side, and skin troubles such as eczema, rash and rash can be reduced.

FIG. 1 is a perspective view of a pants-type disposable diaper according to an embodiment of the present invention in a natural state. FIG. 2 is a developed plan view of the state in which the diaper shown in FIG. 1 is developed and stretched as viewed from the skin contact surface side. Fig.3 (a) is the principal part enlarged plan view which looked at a part of exterior body of the diaper shown in FIG. 2 from the skin contact surface side, FIG.3 (b) is a part of the hollow part shown to (a). It is an enlarged plan view. 4 is a cross-sectional view taken along line IV-IV shown in FIG. FIG. 5 is an exploded perspective view of a part of the outer package of the diaper shown in FIG. FIG. 6 is an enlarged cross-sectional view showing a cross section along the horizontal direction (Y direction) of the waist stretchable part in the diaper shown in FIG. 1.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
The disposable diaper of the present invention includes a ventral region A and a dorsal region B in the longitudinal direction X, and a crotch region C positioned between the A and B, and spans the ventral region A and the dorsal region B. And has an abdominal side waist flap FA and a back side waist flap FB which are located outward from the front and rear end portions 23A and 23B in the longitudinal direction X of the absorbent body 23 and extend in the lateral direction Y. Yes. Here, the abdominal region A is a region disposed on the wearer's abdomen when wearing the disposable diaper, and the back region B is a region disposed on the wearer's back when wearing the disposable diaper. . The ventral waist flap FA is a region extending outward in the vertical direction X from the edge of the front end 23A on the ventral region A side in the vertical direction X of the absorber 23, and the absorber. 23 is a region obtained by combining the region extending in the horizontal direction Y from the front end 23A on the ventral region A side in the vertical direction X. Further, the back side waist flap FB is a region extending outward in the vertical direction X from the edge of the rear end portion 23B on the back side region B side in the vertical direction X of the absorber 23 and absorbing in the horizontal direction Y. It means a region that is combined with a region extending in the lateral direction Y from the rear end 23B of the body 23 in the longitudinal direction X on the back region B side.

  1 and 2 show a pants-type disposable diaper 1 (hereinafter also referred to as “diaper 1”) which is an embodiment of the disposable diaper of the present invention. As shown in FIGS. 1 and 2, the diaper 1 includes an absorbent main body 2 and an exterior body 3 that is arranged on the non-skin-facing surface side of the absorbent main body 2 and fixes the absorbent main body 2. 3 includes an abdominal side waist flap FA and a back side waist flap FB which are located outward from the longitudinal front and rear end portions 23A and 23B of the absorbent body 23 constituting the absorbent main body 2 and extend in the lateral direction Y. ing. The diaper 1 includes a pair of side seal portions S, S in which left and right side edges 3a1, 3a1 of the ventral region A of the exterior body 3 and left and right side edges 3b1, 3b1 of the back region B of the exterior body 3 are joined. A disposable diaper in which a waist opening WO and a pair of leg openings LO, LO are formed. Preferably, the outer body 3 of the diaper 1 is, as shown in FIG. 2, a plan view of the expanded and extended state, and a ventral region A disposed on the wearer's ventral side when worn, worn when worn. It is divided into a dorsal region B disposed on the back side of the person and a crotch region C between the ventral region A and the dorsal region B.

  As shown in FIG. 2, the state where the diaper 1 is expanded and extended as described above refers to peeling the side seal portion S so that the diaper 1 is in an expanded state, and the expanded diaper 1 is replaced with an elastic member of each part. Is extended to the design dimension (same as the dimension when flattened in a state where the influence of the elastic member is completely eliminated).

In the present specification, the “skin contact surface” means a surface of the diaper 1 or a constituent member thereof (for example, the exterior body 3) that contacts the wearer's skin when worn. In addition, the “skin facing surface” is a surface of the diaper 1 or a constituent member thereof that is directed toward the wearer's skin when worn, and the “non-skin facing surface” is the wear of the diaper 1 or a constituent member thereof. It is a surface that is sometimes directed to the side opposite the wearer's skin side (clothing side). In the diaper 1, the vertical direction (X direction) is a direction extending from the ventral region A to the dorsal region B in a state where the diaper 1 is expanded and extended on a plane. Moreover, the horizontal direction (Y direction) is a direction orthogonal to the vertical direction (X direction), and is the width direction of the diaper 1 in a state where the diaper 1 is expanded and extended on a plane.
Moreover, the diaper 1 is a left-right symmetric form with respect to the vertical centerline CL1 extended in a vertical direction (X direction) shown in FIG. In addition, CL2 in FIG. 2 is a horizontal center line extending in the horizontal direction (Y direction) that bisects the diaper 1, and is orthogonal to the vertical center line CL1.

  In the diaper 1, the absorptive main body 2 has a vertically long shape in which the longitudinal direction (X direction) is relatively long in a state where the diaper 1 is unfolded and extended as shown in FIG. The absorptive main body 2 includes a liquid-permeable surface sheet 21 that forms a skin-facing surface, a liquid-permeable surface sheet (including water repellency) that forms a non-skin-facing surface, and both of these sheets 21 and 22. And a liquid-retaining absorbent 23 interposed therebetween. Further, on both sides along the longitudinal direction (X direction) of the absorbent main body 2, as shown in FIG. 2, a leak-proof cuff 24 having an elastic member 25 arranged in an elongated state in the longitudinal direction (X direction), 24 is provided. Specifically, the leak-proof cuff 24 is made of a liquid-impermeable or water-repellent and breathable material, and in the vicinity of the free end of each leak-proof cuff 24, a leak-proof cuff forming elastic member. 25 is arranged in a state of extending in the vertical direction (X direction). When the diaper is worn, the free end portion side of the leak-proof cuff 24 rises due to the contraction of the leak-proof cuff forming elastic member 25, and the outflow of body fluid in the lateral direction (Y direction) is prevented.

  As shown in FIG. 2, the absorbent main body 2 configured as described above has its longitudinal direction (X direction) aligned with the longitudinal direction (X direction) of the diaper 1 in the unfolded and extended state. It is joined to the center part of 3 by the main body fixing adhesive. As described above, the outer package 3 is arranged and bonded and fixed to the non-skin facing surface side of the back sheet 22 constituting the absorbent main body 2 in the thickness direction of the disposable diaper 1. Therefore, in the diaper 1, the absorbent body 23 constituting the absorbent main body 2 is disposed across the ventral region A and the back region B.

  At least the back waist flap FB of the abdominal side waist flap FA and the back side waist flap FB which are located outward from the front and rear end portions 23A and 23B in the longitudinal direction X of the absorbent body 23 and extend in the lateral direction Y It has the hydrophobic skin side sheet | seat 4 which forms a contact surface, and the hydrophilic non-skin side sheet | seat 5 located in the non-skin opposing surface side of the skin side sheet | seat 4. FIG. As shown in FIG. 2, the diaper 1 has a skin side sheet 4 and a non-skin side sheet 5 on the ventral side waist flap FA and the back side waist flap FB, respectively. A hydrophobic outer layer sheet 6 is provided on the opposite surface side.

  Preferably, in the diaper 1, as shown in FIG. 2, the exterior body 3 is positioned outward from the front and rear end portions 23A and 23B in the longitudinal direction X of the absorbent body 23 and extends in the lateral direction Y. It has FA and dorsal waist flap FB. As shown in FIGS. 2 and 4, the exterior body 3 includes an outer layer sheet 6 on the non-skin facing surface side that forms the outer surface of the diaper 1, a skin side sheet 4 on the most skin facing surface side, the outer layer sheet 6 and the skin. An inner layer sheet disposed between the side sheets 4 is provided. In the diaper 1, the inner layer sheet corresponds to the non-skin side sheet 5.

  More preferably, in the diaper 1, as shown in FIG. 2, the sheet material constituting the outer layer sheet 6 in each of the ventral region A and the dorsal region B is a non-skin side sheet along the peripheral edge of the waist opening WO. 5, the folded portion 6R covers the front and rear end portions 23A and 23B in the longitudinal direction (X direction) of the absorbent body 23 constituting the absorbent main body 2. The skin side sheet 4, the non-skin side sheet (inner layer sheet) 5, and the outer layer sheet 6 may be separate sheets, but in the diaper 1, the skin side sheet 4 is the folded portion 6 </ b> R of the outer layer sheet 6. It is formed with. Thus, in the diaper 1, the skin side sheet | seat 4 is distribute | arranged to the skin opposing surface side of each non-skin side sheet | seat 5 of the back side waist flap FB and the abdominal side waist flap FA. In the diaper 1, the outer layer sheet 6 and the non-skin side sheet 5 excluding the folded portion 6R are bound inward toward the longitudinal center line CL1 in the longitudinal direction (X direction) central portion, as shown in FIG. They are formed in the same shape and size. The skin side sheet 4 formed by the folded portion 6R of the outer layer sheet 6 is formed in a rectangular shape that is long in the lateral direction (Y direction).

  As shown in FIG. 4, the skin-side sheet 4 includes a plurality of recesses 41 that are recessed toward the non-skin-side sheet 5, and an opening 44 that penetrates the skin-side sheet 4 in each recess 41. ing. In the diaper 1, the skin side sheet 4 includes a fusion part 42 in which the constituent fibers of the skin side sheet 4 are fused in each depression 41. And the melt | fusion part 42 contains the part which the constituent fiber of the skin side sheet | seat 4 fuse | melted and this constituent fiber is fuse | melted without a gap. Here, the fused part means that the constituent fibers are melted without gaps, and even if it is peeled off from the fused part, it is melted until it no longer returns to the original fiber shape. Means that And the melt | fusion part is the liquid impermeability which does not permeate | transmit a liquid. In the fused part 42 of the diaper 1, the fused part is formed into a film. In the diaper 1, the opening 44 is formed in the fusion | melting part 42, as shown in FIG.3 and FIG.4.

  The opening 44 (the fused portion 42 in which the opening 44 is disposed) is at least in the longitudinal direction of the absorbent body 23 constituting the absorbent main body 2 (at the skin side sheet 4) from the viewpoint of improving sweat absorption. X direction) is preferably arranged on the outer side in the vertical direction X (the side opposite to the horizontal center line CL2 side) than the edge of the rear end portion 23B. In the diaper 1, as shown in FIG. The side sheets 4 are disposed intermittently throughout. Preferably, the fusion part 42 in which the opening 44 is arranged is arranged intermittently so as to form a line along the longitudinal direction (X direction), and includes the plurality of fusion parts 42. A plurality of the fusion part rows 42L are arranged at intervals in the horizontal direction (Y direction). As shown in FIGS. 2 and 3, the fusion portion 42 in which the opening 44 is disposed is disposed at a position that does not overlap with the joint portion 8 to be described later, from the viewpoint of improving sweat diffusibility. In the diaper 1, the fusion part rows 42 </ b> L and the joint part rows 8 </ b> L formed of a plurality of joint parts 8 to be described later are alternately arranged in the lateral direction (Y direction).

  The fused portion 42 in which the opening 44 is arranged can be formed by performing hot embossing only on the skin side sheet 4 and melting until the skin side sheet 4 is opened. As a heat embossing apparatus, an embossing roll and an anvil roll are provided, and what has a convex part of the shape corresponding to the melt | fusion part 42 in the outer peripheral surface of the embossing roll can be used. As a process for forming the fused portion 42, an ultrasonic seal, a laser, or the like can be employed instead of the heat embossing process. When hot melt embossing is performed to form the fused portion 42 in which the opening 44 is disposed, the embossing strength when the fused portion 42 is formed is set to the junction 8 described later. It is preferable to form it with stronger embossing strength.

In the diaper 1, as shown in FIG. 2, in a plan view, a state where the diaper 1 is unfolded and extended is adjacent to the longitudinal direction (X direction) constituting the fusion portion row 42 </ b> L extending in the longitudinal direction (X direction). The distance between the portions 42 and 42 is preferably 1 mm or more, more preferably 3 mm or more, from the viewpoint of improving sweat absorption and preventing sweat from returning from the non-skin side sheet 5 to the skin. , 20 mm or less, more preferably 18 mm or less, specifically more preferably 1 mm or more and 20 mm or less, and even more preferably 3 mm or more and 18 mm or less.
In addition, in a plan view of the unfolded and extended state as shown in FIG. 2, the interval between the fusion part rows 42L and 42L adjacent in the lateral direction (Y direction) is from the viewpoint of improving sweat diffusibility. It is preferably 4 mm or more, more preferably 6 mm or more, and preferably 20 mm or less, more preferably 16 mm or less, specifically, 4 mm or more and 20 mm or less. More preferably, it is 6 mm or more and 16 mm or less.

And as shown in FIG.4 and FIG.5, the thickness of the hollow part 41 becomes small, so that the opening 44 is approached. Here, the smaller the thickness is, the closer to the opening 44, the smaller the thickness is as the opening 44 is approached, and the smaller the thickness is as the opening 44 is approached. It also includes the meaning. As shown in FIGS. 4 and 5, the outer peripheral portion 43 of the opening 44 in the hollow portion 41 constituting the skin side sheet 4 is an inner peripheral wall (periphery of the opening 44) of the fused portion 42 constituting the opening 44. The thickness gradually decreases toward 42e. Here, the outer peripheral portion 43 means a portion including the outer peripheral fused portion 42 from the inner peripheral wall 42 e of the fused portion 42 which is the peripheral edge (contour) of the opening 44. Preferably, the outer peripheral portion 43 is formed in an annular shape with the inner peripheral wall (periphery of the opening 44) 42 e of the fusion portion 42 in each recess portion 41 as a base end. Here, from the viewpoint of transferring the sweat of the wearer to the non-skin-side sheet 5 side, when the depth of the recess 41 in the inner peripheral wall 42e of the fusion part 42 is d3 (see FIG. 4), the fusion is performed. The thickness at a position 0.50 times the depth (d3) outward from the inner peripheral wall 42e of the portion 42 is not less than 20% and not more than 75% of the thickness d2 of the portion excluding the recessed portion 41. The thickness at a position 1.5 times the depth (d3) outward from the inner peripheral wall 42e of the fusion part 42 is preferably 30% or more and 65% or less. The thickness d2 of the part excluding the part 41 is preferably 55% or more and 95% or less, and more preferably 70% or more and 90% or less. Measurement of the depth (d3) of the hollow portion 41 in the inner peripheral wall 42e of the fused portion 42 and the thickness at the above-mentioned separated position are measured in the same manner as the measurement of the thickness d5 of the inner peripheral wall 42e of the fused portion 42 described later. To do.
Moreover, the thickness d2 of the part except the hollow part 41 which comprises the skin side sheet | seat 4 is measured using a thickness measuring device in the state which added the load of 0.05 kPa to the skin side sheet | seat 4. FIG. A laser displacement meter manufactured by OMRON Corporation is used for the thickness measuring instrument. Thickness measurement is carried out by measuring 10 points, and calculating the average value thereof to obtain the thickness of the portion excluding the recessed portion 41.
The fact that the outer peripheral portion 43 of the opening 44 gradually decreases in thickness toward the inner peripheral wall 42e of the fused portion 42 indicates that the depth (d3) is outward from the inner peripheral wall 42e of the fused portion 42. The thickness at a position 0.50 times away from the inner peripheral wall 42e of the fused portion 42 is smaller than the thickness at a position 1.5 times away from the depth (d3).

  In the diaper 1, the opening 44 of the skin side sheet 4 has a thickness d5 (see FIG. 4) of the inner peripheral wall 42e of the fused part 42 from the viewpoint of shifting the sweat of the wearer to the non-skin side sheet 5 side. It is preferably 60 μm or less, more preferably 45 μm or less, and the lower limit is 10 μm. The thickness d5 of the inner peripheral wall 42e of the fused part 42 is measured in the thickness direction so that the cut surface of the inner peripheral wall 42e of the fused part 42 is not crushed by using a knife, cutter, razor or the like so as to include the opening 44. Then, the cut section is observed with a microscope, and the thickness of the inner peripheral wall 42e of the fused portion 42 is measured. The thickness is measured at 10 different inner peripheral walls 42e, and the average value thereof is calculated as the thickness of the inner peripheral wall 42e of the fused portion 42.

  Moreover, in the diaper 1, the opening 44 of the skin side sheet | seat 4 is 0.5 mm or more in diameter L1 (refer FIG. 3) from a viewpoint which transfers a wearer's sweat to the non-skin side sheet | seat 5 side. Is preferably 1 mm or more, more preferably 3 mm or less, still more preferably 2.5 mm or less, specifically 0.5 mm or more and 3 mm or less, More preferably, it is 1 mm or more and 2.5 mm or less. Here, the diameter L1 (see FIG. 3) of the opening 44 means the length of the opening 44 at the narrowest position.

  Further, in the diaper 1, the thickness d5 (see FIG. 4) of the inner peripheral wall 42 e of the fused portion 42 of the skin side sheet 4 is determined from the viewpoint of shifting the wearer's sweat to the non-skin side sheet 5 side. The diameter L1 (see FIG. 3) is preferably 1/10 or less, more preferably 1/30 or less, and the lower limit is 1/50.

Further, in the diaper 1, from the viewpoint of shifting the sweat of the wearer to the non-skin side sheet 5 side, the opening 44 of the skin side sheet 4 has an opening area of 0.5 mm ² or more. Preferably, it is 0.75 mm ² or more, more preferably 5 mm ² or less from the viewpoint that sweat does not return from the non-skin side sheet 5 to the skin, and it is 4 mm ² or less. More preferably, specifically, it is preferably 0.5 mm ² or more and 5 mm ² or less, and more preferably 0.75 mm ² or more and 4 mm ² or less.

  Moreover, in the diaper 1, from the viewpoint of efficiently transferring the sweat of the wearer to the non-skin side sheet 5 side, the back side waist flap FB of the diaper 1 is in a state of being expanded and extended as shown in FIG. In a plan view, the ratio of the area of the entire opening 44 to the total area of the skin-side sheet 4 is preferably 1% or more, more preferably 3% or more, and the non-skin-side sheet 5 From the viewpoint of preventing sweat from returning to the skin, it is preferably 15% or less, more preferably 10% or less, specifically more preferably 1% or more and 15% or less, and more preferably 3% or more. More preferably, it is 10% or less.

Moreover, in the diaper 1, from the viewpoint of shifting the wearer's sweat to the non-skin-side sheet 5 side, the opening 44 of the skin-side sheet 4 is a portion in the outer peripheral portion 43 excluding the recessed portion 41 in the skin-side sheet 4. The thickness d2 (see FIG. 4) is preferably 70% or less in the thin region 43T, and the thin region 43T has a thickness d2 (see FIG. 4) of 40% or less. More preferably, it is formed in the aperture-side thin region 43ST. In the diaper 1, not only the opening 44 is formed in the thin region 43T but also the fusion part 42 is formed in the thin region 43T.
Further, the thickness d2 (see FIG. 4) of the skin-side sheet 4 excluding the depression 41 is preferably 600 μm or less from the viewpoint that sweat does not return from the non-skin-side sheet 5 to the skin, and is 350 μm. The lower limit is more preferably 100 μm.

  In the diaper 1, the thin region 43 </ b> T of the outer peripheral portion 43 of the opening 44 in the recessed portion 41 is formed in an annular shape, like the outer peripheral portion 43. The thin region 43T of the recess 41 has a diameter L2 (see FIGS. 3A and 3B) that is the diameter L1 of the opening 44 (from the viewpoint of transferring the sweat of the wearer to the non-skin side sheet 5 side). As shown in FIGS. 3 (a) and 3 (b), it is preferably 1.5 times or more, more preferably 2 times or more, and the upper limit is 3 times. Here, the diameter L2 (see FIGS. 3A and 3B) of the annular thin region 43T means the length at the narrowest position on the outer periphery of the thin region 43T.

The skin-side sheet 4 has a basis weight of 30 g / m ² or less, and preferably 20 g / m ² or less from the viewpoint of shifting the sweat of the wearer to the non-skin-side sheet 5 side. Since the sheet 4 is a gap between the absorbed non-skin side sheet 5 and the skin, the sweat of the wearer who has moved to the non-skin side sheet 5 is less likely to return to the skin, and the sweat is absorbed. Is more preferably 9 g / m ² or more, more preferably 10 g / m ² or more, specifically 9 g / m ² or more and 30 g / m ² or less. Preferably, it is 10 g / m ² or more and 20 g / m ² or less. The basis weight of the skin-side sheet 4 can be measured from the measurable sheet area and its weight. In this case, the measurement is performed at 23 ± 2 ° C. and a relative humidity of 50 ± 5%, and the sample is stored in the same environment for 24 hours or more before the measurement.

  Moreover, in the exterior body 3, although the skin side sheet | seat 4 and the non-skin side sheet | seat 5 may be fixed by the junction part 8 by the heat embossing mentioned later, for example, as shown in FIG. It is bonded via an adhesive 9. The adhesive 9 is coated on the non-skin facing surface of the skin side sheet 4 or the skin facing surface of the non-skin side sheet 5 in, for example, a spiral shape. From the viewpoint of shifting the wearer's sweat to the non-skin-side sheet 5 side, the position where the adhesive 9 is arranged overlaps with the fusion part 42 of the skin-side sheet 4 as shown in FIG. Preferably it is.

  Moreover, in the diaper 1, the exterior body 3 is extended in the horizontal direction (Y direction) between the non-skin side sheet | seat 5 and the outer layer sheet | seat 6, as shown in FIG.2 and FIG. It has a plurality of elastic members 71 arranged intermittently in the (X direction). In the diaper 1, by providing a plurality of elastic members 71, a waist elastic part G1 and a waistline lower elastic part G2 are formed. Moreover, in the diaper 1, between the non-skin side sheet | seat 5 and the outer layer sheet | seat 6, as shown in FIG. 2, it has the some leg elastic member 72 of the expanded state. In the diaper 1, the leg stretchable part G <b> 3 is formed by including a plurality of leg elastic members 72.

  In the diaper 1, the waist stretchable part G <b> 1 is formed in the longitudinal direction (X direction) of the front and rear end parts 23 </ b> A and 23 </ b> B in the longitudinal direction (X direction) of the absorbent body 23 constituting the absorbent main body 2, as shown in FIG. 2. It is formed on an end flap that is located outward in the longitudinal direction X from the edge (on the side opposite to the lateral center line CL2 side). Moreover, in the diaper 1, the waistline lower elastic part G2 is formed in the side flap located between the lower end of the side center line CL2 side of the waist elastic part G1 and the lower end of the side seal part S in the vertical direction (X direction). Has been. The above-described back-side waist flap FB and ventral-side waist flap FA are regions where the end flap (waist stretchable part G1) is combined with a part of the side flap (trunk lower stretchable part G2). Moreover, in the diaper 1, the leg expansion-contraction part G3 is formed in the peripheral part of the leg opening part LO, as shown in FIG.

  As shown in FIGS. 2 and 3, the exterior body 3 has a plurality of joint portions 8 that join the non-skin side sheet 5 and the outer layer sheet 6 in the diaper 1. As described above, in the diaper 1, the joint portion 8 is not formed on the skin side sheet 4. In the diaper 1, the back-side waist flap FB and the abdominal-side waist flap FA are bonded and fixed to the non-skin-side sheet 5 and the outer layer sheet 6 at a plurality of bonding portions 8 by heat fusion arranged in a dotted pattern. Is formed.

  Preferably, in the diaper 1, as shown in FIG. 2, the non-skin-side sheet 5 and the outer layer sheet 6 are formed in a region extending from the waist stretchable part G1 to the waistline stretchable part G2 of each of the ventral region A and the dorsal region B. Are jointly arranged so as to form a line along the longitudinal direction (X direction), and a joint line 8L composed of the plurality of joints 8 is formed in the lateral direction (Y A plurality of rows are arranged at intervals in the direction).

  The joint portion 8 is formed by superimposing the non-skin side sheet 5 and the outer layer sheet 6 and melting and solidifying the overlapped portion by applying heat embossing. As a heat embossing apparatus, an embossing roll and an anvil roll are provided, and what has the convex part of the shape corresponding to the junction part 8 can be used for the outer peripheral surface of the embossing roll. As a process for forming the joint portion 8, an ultrasonic seal, a laser, or the like can be employed instead of the heat embossing process.

In the diaper 1, the interval between the joints 8 and 8 adjacent to each other in the longitudinal direction (X direction) constituting the joint row 8L extending in the longitudinal direction (X direction) is 1 mm or more from the viewpoint of improving sweat diffusibility. Preferably, it is 3 mm or more, more preferably 20 mm or less, more preferably 18 mm or less, specifically more preferably 1 mm or more and 20 mm or less. More preferably, it is 18 mm or less.
In addition, the distance between the joint rows 8L and 8L adjacent in the lateral direction (Y direction) is preferably 4 mm or more, more preferably 6 mm or more, from the viewpoint of improving the evaporation of absorbed sweat. And it is preferable that it is 20 mm or less, it is more preferable that it is 16 mm or less, specifically, it is more preferable that it is 4 mm or more and 20 mm or less, and it is more preferable that it is 6 mm or more and 16 mm or less.

  The diaper 1 is arranged between the non-skin side sheet 5 and the outer layer sheet 6 fixed at the joint 8 in a state of extending in the horizontal direction (Y direction) and intermittently arranged in the vertical direction (X direction). The plurality of elastic members 71 are provided. Preferably, in the diaper 1, as shown in FIG. 2, a plurality of elastic members 71 are respectively provided in regions extending from the waist stretchable part G <b> 1 to the waistline lower stretchable part G <b> 2 of the ventral region A and the backside region B, respectively. The plurality of joint rows 8L are arranged in a stretched state in the lateral direction (Y direction) through the gaps between the joints 8. In the diaper 1, from the viewpoint that sweat does not return from the non-skin side sheet 5 to the skin, as shown in FIGS. 2 and 3, the elastic members 71, 71 adjacent in the longitudinal direction (X direction) are fused. It is preferable that the part 42 is arranged, and it is preferable that the opening 44 of the skin side sheet 4 is arranged.

  Further, in the diaper 1, as shown in FIG. 2, the non-skin side sheet is provided on both side edges 3 a 1, 3 a 1 of the ventral region A of the exterior body 3 and both side edges 3 b 1, 3 b 1 of the back region B of the exterior body 3. 5 and the outer layer sheet 6 have a pair of outer fixing regions 3T1 and 3T1 joined via an elastic member fixing adhesive, and both side portions along the longitudinal direction (X direction) of the absorbent main body 2 In the vicinity, a non-skin side sheet 5 and an outer layer sheet 6 have a pair of main body side fixing regions 3T2 and 3T2 joined via an elastic member fixing adhesive.

In the waist stretchable part G1 of the diaper 1, a plurality of elastic members 71 are arranged between the pair of outer fixing regions 3T1, 3T1, and these elastic members 71 are respectively a pair of outer fixing regions 3T1, 3T1. In FIG. 2, the sheet is fixed between the non-skin side sheet 5 and the outer layer sheet 6, but is not fixed to either the non-skin side sheet 5 or the outer layer sheet 6 between the pair of outer fixing regions 3T1 and 3T1. .
Moreover, in the waist part lower expansion-contraction part G2 of the diaper 1, the several elastic member 71 is distribute | arranged between the outer side fixed area | region 3T1 and the main body side fixing area | region 3T2, and these elastic members 71 are outer side fixed. In each of the region 3T1 and the main body side fixing region 3T2, it is fixed between the non-skin side sheet 5 and the outer layer sheet 6, while between the outer side fixing region 3T1 and the main body side fixing region 3T2, It is not fixed to any of the side sheet 5 and the outer layer sheet 6. In the waistline lower stretchable part G2 of the diaper 1, the elastic member 71 is not arranged between the pair of main body side fixing regions 3T2 and 3T2, or the elastic member 71 is finely divided so as not to exhibit elastic stretchability. It is arranged in a state that has been subjected to processing such as.

  In addition, in the leg expansion-contraction part G3 of the diaper 1, the some elastic member 72 distribute | arranged to the peripheral part of the leg opening part LO in the expanded state is fixed to the elastic member fixed to the peripheral part of the leg opening part LO. It is being fixed between the non-skin side sheet | seat 5 and the outer-layer sheet | seat 6 via the adhesive agent.

  As shown in FIGS. 1 and 6, the diaper 1 is disposed between the non-skin-side sheet 5 and the outer layer sheet 6 in a stretched state in the lateral direction (Y direction) and intermittently in the longitudinal direction (X direction). Due to the contraction of the plurality of elastic members 71 arranged, the skin side sheet 4 has a gathered portion G that is deformed so as to swell inward of the diaper 1. Preferably, in the outer package 3 of the diaper 1, the waist stretchable part G1 and the waistline lower stretchable part G2 are arranged in a stretched state in the lateral direction (Y direction) between the non-skin side sheet 5 and the outer layer sheet 6 and Due to the contraction of the plurality of elastic members 71 arranged intermittently in the direction (X direction), the outer sheet 6 between the joint rows 8L, 8L adjacent in the lateral direction (Y direction) swells outward. The gathered portion G is formed by deforming and deforming so that the skin-side sheet 4 and the non-skin-side sheet 5 fixed via the adhesive 9 swell inward. And between adjacent joining part row | line | columns 8L and 8L, while the wrinkle 3F which consists of the outer layer sheet 6 or the skin side sheet | seat 4 and the non-skin side sheet | seat 5 arises, the outer layer sheet | seat 6, the skin side sheet | seat 4 and the non-skin side Between the sheet | seat 5, the hollow part 3H enclosed by the eaves 3F and the eaves 3F is formed.

  From the viewpoint of transferring the sweat of the wearer to the non-skin side sheet 5 side, the gathered portion G formed by contracting the elastic member 71 is viewed in cross section as shown in FIG. It is preferable that 60% or more of the entire fused portion 42 is disposed from the half of the depth d4 of the recessed portion recessed to the convex portion side (skin facing surface side), and 75% or more is disposed. The upper limit is preferably 100%.

The formation material of each part of the diaper 1 mentioned above is demonstrated.
The skin-side sheet 4 is a sheet made of a hydrophobic non-woven fabric composed of hydrophobic fibers, and the non-skin-side sheet 5 is a sheet made of a hydrophilic non-woven fabric composed of hydrophilic fibers. .
In the diaper 1, since the skin side sheet 4 constituting the exterior body 3 is formed by the folded portion 6R of the outer layer sheet 6, the entire outer layer sheet 6 including the folded portion 6R (skin side sheet 4) is a hydrophobic fiber. The non-skin side sheet | seat 5 separate from the outer layer sheet | seat 6 is comprised with the hydrophilic sheet | seat.

  Examples of the hydrophobic fiber constituting the hydrophobic sheet used for the outer layer sheet 6 (including the skin-side sheet 4) include synthetic fibers, and specifically, those normally used as constituent fibers of various nonwoven fabrics. For example, polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers; fibers using a thermoplastic resin such as polyethylene terephthalate (PET) and polyamide alone; core-sheath type, side-by-side type, etc. The composite fiber of the structure is mentioned.

  Examples of the hydrophilic fiber constituting the hydrophilic sheet used for the non-skin side sheet 5 include those obtained by hydrophilizing synthetic fibers, specifically, those obtained by treating hydrophobic synthetic fibers with a hydrophilizing agent, fibers And kneading a hydrophilizing agent. In addition, a composite nonwoven fabric in which fibers having inherent hydrophilicity, for example, natural or semi-natural fibers are mixed with synthetic fibers can also be used. The synthetic fiber is not particularly limited, but is a polyolefin fiber such as polyethylene (PE) fiber or polypropylene (PP) fiber; a fiber made of a thermoplastic resin such as polyethylene terephthalate (PET) or polyamide; a core-sheath type And a composite fiber having a side-by-side structure. The hydrophilizing agent used for hydrophilizing the synthetic fiber is not particularly limited as long as it is a general hydrophilizing agent used for hygiene products. Specific examples of the hydrophilic fiber include natural cellulose fibers such as non-wood pulp such as wood pulp, cotton pulp, and straw pulp; and regenerated cellulose fibers such as rayon and cupra. The hydrophilic sheet includes a hydrophilic cloth in addition to the hydrophilic nonwoven fabric. Examples of the hydrophilic nonwoven fabric include air-through nonwoven fabric, spunbond nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, and melt blown nonwoven fabric.

The determination of whether the fiber constituting the sheet is hydrophilic or hydrophobic is made based on the contact angle of the constituent fiber measured by the following [Measurement Method of Contact Angle of Fiber]. Specifically, if the contact angle is 90 ° or more, it is determined that the hydrophilicity is low, and if the contact angle is less than 90 °, it is determined that the hydrophilicity is high.
[Measurement method of fiber contact angle]
For the measurement of the contact angle, for example, a contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Specifically, after ion-exchanged water is dropped (about 20 picoliters) on the surface of the fiber constituting the outer peripheral portion 43, the contact angle is measured immediately using the contact angle meter. The measurement is performed at five or more locations of the fibers constituting the vicinity of the inner peripheral wall 42e of the fused portion 42, or the fibers constituting the vicinity of the outer edge of the recessed portion 41, and the average value thereof is taken as the contact angle. The measurement environment temperature is 20 ° C.

  As the top sheet 21, the back sheet 22, the absorber 23, the leak-proof cuff 24, etc. constituting the absorbent main body 2, various kinds of materials conventionally used for absorbent articles such as disposable diapers are used without particular limitation. Can do. For example, as the surface sheet 21, a single layer or multilayer nonwoven fabric, a perforated film, or the like can be used. As the back sheet 22, a moisture-permeable resin film or the like can be used. As the absorbent body 23, an absorbent core made of absorbent polymer particles and a fiber material and covered with tissue paper can be used. Moreover, as the leak-proof cuff 24, a water-repellent single layer or multilayer nonwoven fabric or the like can be used.

  Examples of the elastic member (the elastic member 25 for forming a leakproof cuff, the elastic member 71, the leg elastic member 72, etc.) include synthetic rubber such as styrene-butadiene, butadiene, isoprene, neoprene, natural rubber, EVA, stretchable polyolefin, A polyurethane etc. can be mentioned. As the form of the elastic member, a thread-like (thread rubber etc.) having a cross section of a rectangle, a square, a circle, an ellipse, a polygon or the like, or a string-like (flat rubber etc.) can be preferably used.

  Adhesive 9, elastic member fixing elastic member (elastic member 25 for forming leakproof cuff, elastic member 71, leg elastic member 72, etc.), and main body for fixing exterior body 3 and absorbent main body 2 and the like As the fixing adhesive, various hot melt adhesives conventionally used for absorbent articles such as disposable diapers can be used without particular limitation.

The effect at the time of using the diaper 1 of one Embodiment of this invention mentioned above is demonstrated.
In the diaper 1, as shown in FIGS. 2 to 5, at least the back waist flap FB has a hydrophobic skin side sheet 4 and a hydrophilic non-skin side sheet 5, and the hydrophobic skin side sheet 4. However, the hollow part 41 hollowed toward the non-skin side sheet | seat 5 side and the opening 44 are provided in each hollow part 41. As shown in FIG. And the thickness of the hollow part 41 of the skin side sheet | seat 4 is so small that it approaches the opening 44. FIG. That is, the distance between the constituent fibers is gradually narrowed toward the opening 44. Therefore, during wearing of the diaper 1, the wearer's sweat is likely to be drawn from the portion excluding the recessed portion 41 to the recessed portion 41, and the thickness of the recessed portion 41 is so small that it approaches the opening 44. From 44, sweat easily moves to the hydrophilic non-skin-side sheet 5 quickly. The sweat of the wearer in the hydrophilic non-skin side sheet 5 thus transferred is difficult to return to the hydrophobic skin side sheet 4 and the skin again. Thus, since the sweat of the wearer who has moved to the non-skin facing sheet 5 on the non-skin facing surface side is difficult to touch the skin, skin troubles such as eczema, rash and rash can be reduced.

Moreover, in the diaper 1, as shown in FIG.2 and FIG.4, the fusion | melting part 42 which the constituent fibers of the skin side sheet | seat 4 fuse | melted in the hollow part 41 is provided. Moreover, the fusion | melting part 42 contains the part which the constituent fiber of the skin side sheet | seat 4 fuse | melted and this constituent fiber is fuse | melted without a gap. In the diaper 1, an opening 44 is formed in such a fusion part 42. Here, the fiber density of the fusion part 42 is higher than the fiber density of the outer peripheral part 43 of the opening 44 in the hollow part 41, and the fiber density of the outer peripheral part 43 is higher than the fiber density of the part excluding the hollow part 41. Has been. The part that is fused without a gap is liquid-impermeable that does not allow liquid to pass through. However, since the affinity with water is relatively strong, the wearer wears the diaper 1 while wearing it. Is more likely to be drawn to the depression 41 from the portion excluding the depression 41, and the sweat from the outer peripheral portion 43 having a high fiber density passes through the opening 44 of the fused portion 42 and is a hydrophilic non-skin side sheet. 5 is easier to move to. Thus, since the user's sweat is more easily transferred to the non-skin-side sheet 5 on the non-skin facing surface side, skin troubles such as eczema, rash and rash can be further reduced. Moreover, in the diaper 1, since the part melt | fused without the said gap is formed into a film, the said effect can be show | played further. Moreover, if the basic weight of the skin side sheet | seat 4 is 30 g / m < ² > or less, the said effect can be show | played further.

  Moreover, in the diaper 1, as shown in FIG. 2, it has the hydrophobic outer layer sheet 6 on the non-skin facing surface side of the non-skin side sheet 5, and in the region extending from the waist stretchable part G1 to the waistline lower stretchable part G2, The plurality of elastic members 71 are arranged in an extended state in the lateral direction (Y direction) through the gaps between the joint portions 8 of the plurality of joint row 8L. And as shown in FIG. 6, when the elastic member 71 arranged in the stretched state contracts, the skin-side sheet 4 and the non-skin-side sheet 5 and the outer layer are disposed between the adjacent joining portion rows 8L and 8L. A fold 3F formed of the sheet 6 is generated, and a hollow portion 3H surrounded by the fold 3F and the fold 3F is formed between the skin side sheet 4 and the non-skin side sheet 5 and the outer layer sheet 6. It becomes like this. Therefore, the evaporability of the sweat of the wearer who has moved to the non-skin-side sheet 5 is improved, and skin troubles such as eczema, rash and rash can be further reduced.

From the viewpoint of further exerting an effect that the sweat of the wearer is easily transferred to the non-skin side sheet 5, the distance between the fibers of the constituent fibers constituting the skin side sheet 4 in the dent portion 41 is the opening side. It is preferably smaller than the outer side of 44. More specifically, the inter-fiber distance of the fibers constituting the aperture-side thin region 43ST in the outer peripheral portion 43 is 4/5 or less of the inter-fiber distance of the fibers constituting the vicinity of the outer edge of the recessed portion 41 in the outer peripheral portion 43. Preferably, it is 2/5 or less.
The inter-fiber distance of the fibers constituting the aperture-side thin region 43ST in the outer peripheral portion 43 and the inter-fiber distance of the fibers constituting the vicinity of the outer edge of the recess 41 are measured by the following method. The interfiber distance measured by the following method means that the affinity with water increases as the value decreases.

[Measurement method of interfiber distance]
In each of the parts to be measured, the basis weight, thickness, and fiber denier are measured, and the inter-fiber distance is calculated by the equation [Equation 1]. When measuring different parts of the same sheet,
There is no change in sheet basis weight and fiber denier, only thickness changes. The thickness is measured as follows. The thickness of the sheet is measured by using a knife, cutter, razor, etc. so as to include the measuring section, cutting in the thickness direction so that the cut surface is not crushed, and observing the cut section with a microscope, and measuring the thickness of the measuring section To do. In thickness measurement, 10 different points are measured, and the average value thereof is calculated as the thickness of the measurement part.

Furthermore, from the viewpoint of further achieving the above-described effects, the contact angle between the skin-side sheet 4 and the ion-exchanged water in the recessed portion 41 is smaller on the opening 44 side than on the outer side of the opening 44. preferable. In other words, it is preferable that the affinity of the skin-side sheet 4 in the recessed portion 41 with water is greater on the opening 44 side than on the outer side of the opening 44. Specifically, the skin-side sheet constituting the opening 44 side (opening-side thin region 43ST) in the outer peripheral portion 43 preferably has a contact angle with ion-exchanged water of 120 ° or less, and 110 ° or less. More preferably it is. Although there is no restriction | limiting in particular in the minimum of the contact angle of this skin side sheet | seat to comprise, Since a skin side sheet | seat is hydrophobic, a minimum is 90 degrees.
Further, the skin-side sheet constituting the outer side of the opening 44 (near the outer edge of the recessed portion 41 in the outer peripheral portion 43) preferably has a contact angle with ion exchange water of 120 ° or more, and 130 ° or more. More preferably. If the upper limit of the contact angle of the skin-side sheet is 180 °, a sufficiently satisfactory effect can be obtained.
Further, the contact angle between the skin-side sheet on the opening 44 side (open-side thin region 43ST) and ion-exchanged water, the outer side of the opening 44 (near the outer edge of the recessed portion 41 in the outer peripheral portion 43), and ion exchange. It is preferable that the contact angle difference with water is large. More specifically, the contact angle difference is preferably 10 ° or more, and more preferably 20 ° or more.
The contact angle between the skin-side sheet constituting the aperture-side thin region 43ST in the outer peripheral portion 43 or the skin-side sheet constituting the vicinity of the outer edge of the recessed portion 41 in the outer peripheral portion 43 and ion-exchanged water is measured by the following method. To do. The contact angle measured by the following method means that the lower the value, the higher the affinity with water.

[Measurement method of sheet contact angle]
Measurement was performed using a microscope VHX-1000 manufactured by Keyence Corporation with a medium magnification zoom lens tilted at 90 °. As the measurement sample, a sheet cut into a size of 150 mm in the MD direction and 70 mm in the CD direction was used. The measurement environment was 20 ° C./50% RH, and the measurement sample was set on the measurement stage so that it could be observed from the CD direction of the sheet with the measurement surface facing upward. Next, 3 μL of ion-exchanged water is attached to the portion of the measurement sample set on the measurement stage to be measured (in the vicinity of the outer edge of the opening portion thin region 43ST in the outer peripheral portion 43 and the recessed portion 41 in the outer peripheral portion 43). take in. The contact angles at 10 points were measured for each of the observation results with clear focus at both ends or one end of the water droplets on the sheet, and the average value thereof was defined as “contact angle”.

The basis weight of the non-skin side sheet 5 is 10 g / m ² from the viewpoint of further reducing the amount of sweat that absorbs a large amount of sweat and touches the skin and prevents the sweat from returning from the non-skin side sheet to the skin. Preferably, it is 20 g / m ² or more, more preferably 50 g / m ² or less, further preferably 30 g / m ² or less, specifically 10 g. it is preferably / m ² or more 50 g / m ² or less, further preferably 20 g / m ² or more 30 g / m ² or less.
From the same viewpoint, the thickness of the non-skin-side sheet 5 is preferably 100 μm or more, more preferably 150 μm or more, and 0.80 mm or less in the portion excluding the recessed portion 41. Is preferably 0.50 mm or less, specifically, preferably 0.10 mm or more and 0.80 mm or less, and more preferably 0.15 mm or more and 0.50 mm or less. The thickness of the non-skin side sheet 5 is measured using a thickness measuring instrument in a state where a load of 0.05 kPa is applied to the non-skin side sheet 5. A laser displacement meter manufactured by OMRON Corporation is used for the thickness measuring instrument. Thickness is measured at 10 points, and the average value is calculated as the thickness.

  From the viewpoint of further exerting an effect that the sweat of the wearer easily shifts to the non-skin-side sheet 5, the non-skin-side sheet 5 preferably has a blending ratio of hydrophilic fibers to the entire constituent fibers of 80% by mass or more. 90% by mass or more, and the lower limit is preferably 70% by mass.

Further, from the viewpoint of further exerting an effect that the sweat of the wearer is easily transferred to the non-skin side sheet 5, the non-skin side sheet 5 has a 30-mm width Klem water absorption height measured according to JIS P 8141, for 60 seconds. It is preferably 20 mm or more, and more preferably 25 mm or more in 60 seconds. Although there is no restriction | limiting in particular in the upper limit of the Klem water absorption height of the non-skin side sheet | seat 5, if it is 30 mm in 60 seconds, the effect which is fully satisfied is acquired.
The clem water absorption height of the non-skin side sheet 5 is measured by the following method.

[Measurement method of Klem water absorption height]
When removing the non-skin side sheet 5 from the exterior body of the pants-type disposable diaper, when the skin side sheet 4, the non-skin side sheet 5 and the outer layer sheet 6 are fixed by heat fusion or an adhesive, The fixed portion is removed by melting with hot air from a solvent or a dryer, and the non-skin side sheet 5 is taken out. Using the taken-out non-skin side sheet 5 as a sample, the Krem water absorption height is measured according to the test method of JIS P 8141. Specifically, the non-skin side sheet 5 taken out is cut into a width (length in the longitudinal direction (X direction) of the diaper 1) of 30 mm and a length (length in the lateral direction (Y direction) of the diaper 1) of 150 mm. To do. In cutting, a cutting method that may crush the sample, such as a press cutter, is not preferable because it has a high possibility of affecting the result. Therefore, when cutting, the cut surface of the sample is cut so as not to be crushed by using a knife, a cutter, a razor or the like. Next, the cut sample is set in a jig specified in JIS P 8141, and the water absorption height after 60 seconds is measured using water as a test solution. In order to easily distinguish the sucked height, the test liquid may be appropriately colored with a dye such as Blue No. 1 or methylene blue. The above measurement is performed 5 times and the average value is defined as the water absorption height of the non-skin side sheet 5. The measurement environment temperature is 22 ° C.

Further, from the viewpoint of further exhibiting the effect that the sweat of the wearer is easily transferred to the non-skin side sheet 5, the non-skin side sheet 5 preferably has a saturated water absorption of 75 gsm or more, and 100 gsm or more. More preferably it is. Although there is no restriction | limiting in particular in the upper limit of the saturated water absorption amount of the non-skin side sheet | seat 5, If it is 300 gsm, the effect which should fully be satisfied is acquired.
The saturated water absorption amount of the non-skin side sheet 5 is measured by the following method.

[Measurement method of saturated water absorption]
A non-skin side sheet is cut into a width of 50 mm and a length of 50 mm to produce a measurement sample. The measurement sample is immersed in ion-exchanged water adjusted to 25 ° C. After 5 minutes from the start of immersion, the sample is taken out from the ion-exchanged water, suspended in a vertical state for 30 seconds and drained. The mass of the sample after water absorption is measured, and the target saturated absorption amount is calculated according to the following formula. Saturated absorption (g / g) = (mass of sample after water absorption (g) −mass of sample before water absorption (g)) / (measurement sample area 0.05 m × 0.05 m) The above measurement is performed 5 times, and the average value is defined as the saturated absorption amount of the non-skin side sheet.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, in the diaper 1 described above, the skin side sheet 4 constituting the exterior body 3 is formed by the folded portion 6R of one outer layer sheet 6 as shown in FIG. The body may be a hydrophobic sheet (nonwoven fabric). When arrange | positioning such a separate skin side sheet | seat 4, what is necessary is just to arrange | position the separate skin side sheet | seat 4 only to the back side waist flap FB at least among the abdominal side waist flap FA and the back side waist flap FB. .

  Moreover, in the diaper 1, as shown in FIG. 4, the hydrophilic non-skin side sheet | seat 5 with which at least the back | dorsal side waist flap FB is provided is one sheet, However, Multiple sheets may be sufficient. Thus, when there are a plurality of hydrophilic non-skin-side sheets 5, it is preferable that the hydrophilicity becomes stronger as the distance from the skin of the wearer increases. That is, as compared with the non-skin side sheet adjacent to the skin side sheet 4, as the distance from the skin side sheet 4 increases, the blending ratio of the hydrophilic fibers relative to the entire constituent fibers described above, the basis weight of the non-skin side sheet described above, It is preferable that at least one of the Klem water absorption height and the saturated water absorption amount described above is larger than the value of the non-skin side sheet adjacent to the skin side sheet 4. Moreover, compared with the non-skin side sheet | seat 4 adjacent to the skin side sheet | seat 4, the distance between the fibers of the non-skin side sheet | seat and the fiber which comprises a non-skin side sheet | seat are ion-exchanged as it leaves | separates from the skin side sheet | seat 4. It is preferable that at least any one of the contact angles with water is smaller than the value of the non-skin side sheet adjacent to the skin side sheet 4. The contact angle between the fibers constituting the non-skin side sheet and ion-exchanged water is measured by the method described above. Moreover, the interfiber distance of the fiber which comprises a non-skin side sheet | seat is measured with the following method.

[Measurement method of interfiber distance]
It can obtain | require by following formula (1).

  Moreover, in the exterior body 3 of the diaper 1, as shown in FIG. 2, the outer layer sheet 6 and the non-skin side sheet 5 are joined and fixed by a plurality of joint portions 8 by heat fusion, and the skin side sheet 4 and the non-skin side The sheet 5 is fixed via the adhesive 9, but the adhesive 9 may not be disposed. Moreover, in the exterior body 3 of the diaper 1, as shown in FIG. 2, the elastic member 71 is disposed between the outer layer sheet 6 and the non-skin side sheet 5, but even if the elastic member 71 is not disposed. Good.

  Moreover, in the disposable diaper 1 mentioned above, as shown in FIG. 2, the exterior body 3 is a pants-type disposable diaper having a continuous shape such as an hourglass shape extending over the ventral region A, the crotch region C, and the dorsal region B. The exterior body 3 may be a split-type pants-type disposable diaper that is divided as a separate member into a ventral-side exterior body, a back-side exterior body, and a crotch exterior body.

  Moreover, in the disposable diaper 1 mentioned above, as shown in FIG. 1, although it is a pants-type disposable diaper which has the exterior body 3, it may be a deployment-type disposable diaper. In the case of a deployable disposable diaper having a liquid permeable top sheet, a liquid permeable back sheet, and an absorbent body between these sheets, the top sheet corresponds to the non-skin-side sheet 5. Then, skin contact is made with at least the back waist flap FB of the abdominal side waist flap FA and the back side waist flap FB which are located outward from the front and rear end portions in the longitudinal direction X of the absorbent body and extend in the lateral direction Y. What is necessary is just to arrange | position the separate hydrophobic skin side sheet | seat 4 which forms a surface.

  The following disposable diaper is further disclosed regarding the embodiment mentioned above.

<1>
A ventral region and a dorsal region in the vertical direction, and a crotch region positioned between them, and has an absorber over the ventral region and the dorsal region, and the longitudinal direction of the absorber A disposable diaper having an abdominal waist flap and a dorsal waist flap that are located outward from the front and rear ends and extend in the lateral direction, wherein at least the dorsal waist flap is a hydrophobic surface forming a skin contact surface A skin-side sheet and a hydrophilic non-skin-side sheet positioned on the non-skin-facing surface side of the skin-side sheet, wherein the skin-side sheet is a plurality of depressions recessed toward the non-skin-side sheet. A disposable diaper comprising a portion and an opening penetrating the skin-side sheet in each of the recess portions, and the thickness of the recess portion of the skin-side sheet decreases as the opening approaches.
<2>
The said opening of the said skin side sheet | seat is a disposable diaper as described in said <1> whose diameter is 0.5 mm or more and 3 mm or less.
<3>
The thickness of the peripheral part of the said hole of the said skin side sheet | seat is a disposable diaper as described in said <1> or <2> which is 1/10 or less of the diameter of this hole.
<4>
The said opening of the said skin side sheet | seat is formed in the thin area | region of this dent part which is the thickness of 70% or less of the thickness of the part except the said dent part in the said skin side sheet | seat. > The disposable diaper of any one of>.

<5>
The disposable diaper according to <4>, wherein the thin region of the hollow portion has an annular shape, and a diameter thereof is 1.5 times or more a diameter of the opening.
<6>
The skin-side sheet includes a fusion part in which the constituent fibers of the skin-side sheet are fused in each of the recesses, and the constituent parts of the skin-side sheet are melted by melting the constituent fibers of the skin-side sheet. The disposable diaper according to any one of <1> to <5>, wherein the open hole is formed in the fusion part.
<7>
The affinity with the water of the skin side sheet in the dent portion is greater in any one of the above <1> to <6> in that the opening side is larger than the outer side of the opening. Disposable diapers.
<8>
The disposable diaper is arranged on the non-skin facing surface side of the non-skin side sheet in a state of extending in a lateral direction between the non-skin side sheet and the outer layer sheet and a hydrophobic outer layer sheet and the non-skin side sheet. A plurality of elastic members intermittently disposed in the longitudinal direction of the disposable diaper, and the opening of the skin side sheet is disposed between the elastic members adjacent in the longitudinal direction. The disposable diaper according to any one of> to <7>.
<9>
The skin-side sheet includes a fusion part in which the constituent fibers of the skin-side sheet are fused in each recess, and the skin-side sheet and the non-skin-side sheet are bonded via an adhesive. The disposable diaper according to any one of <1> to <8>, wherein a position where the adhesive is disposed overlaps with the fused portion of the skin side sheet.

<10>
The said skin side sheet | seat is provided with the fusion | melting part which the constituent fibers of this skin side sheet | seat fused in each said hollow part, and this fusion | melting part is the said <1> in which the melt | fusion part is filmed. The disposable diaper according to any one of to <9>.
<11>
The disposable diaper has a hydrophobic outer layer sheet on the non-skin facing surface side of the non-skin side sheet, and the skin side sheet is formed by a folded portion of the outer layer sheet. > The disposable diaper of any one of>.
<12>
The skin-side sheet includes a fusion part in which the constituent fibers of the skin-side sheet are fused in each of the depressions, and the opening (a fusion part in which the opening is arranged) is formed in the skin. The disposable diaper according to any one of <1> to <11>, wherein the disposable diaper is disposed intermittently throughout the entire side sheet.
<13>
The skin-side sheet includes a fusion part in which the constituent fibers of the skin-side sheet are fused in each of the depressions, and the fusion part has the opening and forms a line along the vertical direction. Any one of the above items <1> to <12>, in which the plurality of fused portions are arranged intermittently so that a plurality of rows of the fused portions are arranged at intervals in the horizontal direction. Disposable diapers described in 1.
<14>
The interval between the longitudinally adjacent fusion parts constituting the fusion part row extending in the longitudinal direction is preferably 1 mm or more, more preferably 3 mm or more, and 20 mm or less. The disposable diaper according to <13>, wherein the disposable diaper is preferably 18 mm or less.

<15>
The interval between the fusion part rows adjacent in the lateral direction is preferably 4 mm or more, more preferably 6 mm or more, and preferably 20 mm or less, more preferably 16 mm or less. The disposable diaper according to <13> or <14>.
<16>
The skin side sheet has a fusion part in which the constituent fibers of the skin side sheet are fused in each of the depressions, and when the depth of the depression 41 in the inner peripheral wall of the fusion part is d3, The thickness of the fusion part at a position 0.50 times the depth d3 outward from the inner peripheral wall is 20% or more and 75% or less of the thickness d2 of the part excluding the depression part. The disposable diaper according to any one of <1> to <15>, preferably 30% to 65%.
<17>
The skin side sheet includes a fusion part in which the constituent fibers of the skin side sheet are fused in each of the depressions, and the depth (d3) of 1.5 is formed outward from the inner peripheral wall of the fusion part. The thickness at a position twice as long is preferably 55% or more and 95% or less, and more preferably 70% or more and 90% or less of the thickness d2 of the portion excluding the depression 41. The disposable diaper according to any one of <16>.
<18>
The skin-side sheet includes a fusion part in which the constituent fibers of the skin-side sheet are fused in each recess, and the fusion part of the skin-side sheet has a thickness d5 of an inner peripheral wall of the fusion part. Is preferably 60 μm or less, more preferably 45 μm or less, and the lower limit is 10 μm. The disposable diaper according to any one of <1> to <17>.
<19>
The opening of the skin side sheet has a diameter L1 of preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 3 mm or less, and 2.5 mm or less. More preferably, specifically, it is preferably 0.5 mm or more and 3 mm or less, more preferably 1 mm or more and 2.5 mm or less, and the disposable according to any one of the above <1> to <18> Diapers.

<20>
The skin-side sheet includes a fusion part in which the constituent fibers of the skin-side sheet are fused in each recess, and the thickness d5 of the inner peripheral wall of the fusion part is 1 of the diameter L1 of the opening. The disposable diaper according to any one of the above items <1> to <19>, which is preferably / 10 or less, more preferably 1/30 or less, and the lower limit is 1/50.
<21>
The opening of the skin-side sheet has an opening area of one opening of preferably 0.5 mm ² or more, more preferably 0.75 mm ² or more, and 5 mm ² or less. The disposable diaper according to any one of <1> to <20>, preferably 4 mm ² or less.
<22>
The ratio of the total aperture area to the total area of the skin-side sheet is preferably 1% or more, more preferably 3% or more, preferably 15% or less, and preferably 10% or less. The disposable diaper according to any one of <1> to <21>, which is more preferably present.
<23>
The opening of the skin side sheet is formed in a thin region having a thickness of 70% or less of a thickness d2 of a portion of the skin side sheet excluding the recess in the outer peripheral portion of the recess. Preferably, it is further preferably formed in the aperture-side thin region having a thickness of 40% or less of the thickness d2 in the thin region, according to any one of the above items <1> to <22>. Disposable diapers.
<24>
Any one of <1> to <23>, in which the thickness d2 of the skin-side sheet excluding the dent is preferably 600 μm or less, more preferably 350 μm or less, and the lower limit is 100 μm. Disposable diapers described in 1.

<25>
The thin region of the outer peripheral portion of the opening in the hollow portion is the disposable diaper according to any one of <1> to <24>, which is formed in an annular shape, similarly to the outer peripheral portion.
<26>
The thin region of the indented portion has a diameter L2 which is preferably 1.5 times or more, more preferably 2 times or more, and an upper limit of 3 times the diameter L1 of the opening. The disposable diaper according to any one of 1> to <25>.
<27>
The skin-side sheet has a basis weight of 30 g / m ² or less, preferably 20 g / m ² or less, preferably 9 g / m ² or more, and more preferably 10 g / m ² or more. The disposable diaper described in any one of <1> to <26> above.
<28>
The back waist flap and the abdomen waist flap are formed by bonding and fixing the non-skin side sheet 5 and the outer layer sheet 6 at a plurality of joints 8 arranged in the form of dots. The disposable diaper according to any one of> to <27>.
<29>
The non-skin-side sheet has a hydrophobic outer layer sheet on the non-skin-facing surface side of the non-skin-side sheet, and the non-skin-side sheet is provided in a region extending from a waist stretchable portion to a waistline lower stretchable portion of each of the ventral region and the dorsal region. And the outer layer sheet are intermittently arranged in a row along the vertical direction, and a plurality of rows of joint portions formed of the plurality of joint portions are arranged at intervals in the horizontal direction. The disposable diaper according to any one of the above items <1> to <28>.

<30>
The interval between the joint portions adjacent in the longitudinal direction constituting the joint row extending in the vertical direction is preferably 1 mm or more, more preferably 3 mm or more, and preferably 20 mm or less. The disposable diaper according to <29>, more preferably 18 mm or less.
<31>
The interval between the joint rows adjacent in the lateral direction is preferably 4 mm or more, more preferably 6 mm or more, and preferably 20 mm or less, more preferably 16 mm or less. The disposable diaper as described in <29> or <30>.
<32>
The disposable diaper is arranged on the non-skin facing surface side of the non-skin side sheet in a state of extending in a lateral direction between the non-skin side sheet and the outer layer sheet and a hydrophobic outer layer sheet and the non-skin side sheet. A plurality of elastic members intermittently disposed in the longitudinal direction of the disposable diaper, and the skin-side sheet has a fusion portion in each of the recessed portions, and is between the elastic members adjacent in the longitudinal direction. The disposable diaper according to any one of <1> to <31>, wherein the fusion part is preferably disposed, and the opening of the skin side sheet is preferably disposed.
<33>
The disposable diaper is arranged on the non-skin facing surface side of the non-skin side sheet in a state of extending in a lateral direction between the non-skin side sheet and the outer layer sheet and a hydrophobic outer layer sheet and the non-skin side sheet. A plurality of elastic members arranged intermittently in the longitudinal direction of the disposable diaper, the skin side sheet has a fusion part in each of the recesses,
When the gathered portion formed by contraction of the elastic member is viewed in cross section, from the half position of the depth d4 of the concave portion recessed on the non-skin side of the skin side sheet, to the convex portion side (skin facing surface side), It is preferable that 60% or more of the entire fused portion is disposed, preferably 75% or more is disposed, and the upper limit is preferably 100%. <1> to <32> The disposable diaper according to any one of the above.
<34>
Any of the above <1> to <33>, wherein the interfiber distance of the constituent fibers constituting the skin side sheet in the recess is preferably smaller on the opening side than on the outer side of the opening. The disposable diaper according to claim 1.

<35>
The fibers constituting the aperture-side thin region having a thickness of 40% or less of the thickness d2 in the thin region having a thickness of 70% or less of the thickness d2 of the portion excluding the recess in the outer peripheral portion of the aperture. The inter-fiber distance is preferably 4/5 or less, more preferably 2/5 or less of the inter-fiber distance of the fibers constituting the vicinity of the outer edge of the recess in the outer peripheral portion <1>. The disposable diaper according to any one of ~ <34>.
<36>
The skin constituting the aperture-side thin region having a thickness of 40% or less of the thickness d2 in the thin region having a thickness of 70% or less of the thickness d2 of the portion excluding the recess in the outer peripheral portion of the aperture. The disposable diaper according to any one of <1> to <35>, wherein the side sheet has a contact angle with ion-exchanged water of preferably 120 ° or less, and more preferably 110 ° or less.
<37>
The skin-side sheet constituting the vicinity of the outer edge of the recess in the outer peripheral portion of the opening preferably has a contact angle with ion-exchanged water of 120 ° or more, and more preferably 130 ° or more. The disposable diaper according to any one of 1> to <36>.
<38>
The skin-side sheet has a fusion part in which the constituent fibers of the skin-side sheet are fused in each of the depressions, the contact angle between the vicinity of the fusion part and ion-exchanged water, and the outer periphery of the opening It is preferable that the contact angle difference between the vicinity of the outer edge of the depression and the ion exchange water in the portion is large, the contact angle difference is preferably 10 ° or more, and more preferably 20 ° or more. The disposable diaper according to any one of 1> to <37>.
<39>
The basis weight of the non-skin side sheet is preferably 10 g / m ² or more, more preferably 20 g / m ² or more, and preferably 50 g / m ² or less, 30 g / m ^2. The disposable diaper according to any one of the above items <1> to <38>, more preferably m ² or less.

<40>
The thickness of the non-skin side sheet is preferably 100 μm or more, more preferably 150 μm or more, and preferably 0.80 mm or less, in a portion excluding the depression. The disposable diaper according to any one of the above items <1> to <39>, which is more preferably as follows.
<41>
The non-skin-side sheet preferably has a hydrophilic fiber content of 80% by mass or more, more preferably 90% by mass or more, and a lower limit of 70% by mass with respect to the entire constituent fibers. The disposable diaper according to any one of <1> to <40>, which is preferable.
<42>
The non-skin-side sheet preferably has a 30 mm-wide clem water absorption height measured in accordance with JIS P 8141 of 20 mm or more in 60 seconds, and more preferably 25 mm or more in 60 seconds. The disposable diaper according to any one of> to <41>.
<43>
The non-skin-side sheet is a disposable diaper according to any one of <1> to <42>, wherein the saturated water absorption amount of ion-exchanged water is preferably 75 gsm or more, and more preferably 100 gsm or more.

1 Pants-type disposable diaper (absorbent article)
DESCRIPTION OF SYMBOLS 2 Absorbent main body 21 Top sheet 22 Back sheet 23 Absorber 24 Leak-proof cuff 25 Leak-proof cuff forming elastic member 3 Exterior body 4 Skin-side sheet 41 Depressed part 42 Fusion part 42L Fusion part row 43 Outer peripheral part of opening 43T Thin area of outer peripheral part 43ST Open side thin area 44 of outer peripheral part 44 Open hole 5 Non-skin side sheet 6 Outer layer sheet 71 Elastic member 72 Leg elastic member 8 Joint part 8L Joint part row 9 Adhesive A Abdominal side area, B back Side area, C Inseam area

Claims (9)

A ventral region and a dorsal region in the vertical direction, and a crotch region positioned between them, and has an absorber over the ventral region and the dorsal region, and the longitudinal direction of the absorber A disposable diaper having a ventral side waist flap and a back side waist flap that are located outward from the front and rear ends and extend in the lateral direction,
At least the back-side waist flap has a hydrophobic skin-side sheet that forms a skin contact surface, and a hydrophilic non-skin-side sheet positioned on the non-skin-facing surface side of the skin-side sheet,
The skin-side sheet includes a plurality of recesses that are recessed toward the non-skin-side sheet, and an opening that penetrates the skin-side sheet in each recess.
The said dent part of the said skin side sheet | seat is a disposable diaper whose thickness is so small that it approaches the said opening.   The disposable diaper according to claim 1, wherein the opening of the skin-side sheet has a diameter of 0.5 mm or more and 3 mm or less.   The disposable diaper according to claim 1 or 2, wherein a thickness of a peripheral edge portion of the opening of the skin side sheet is 1/10 or less of a diameter of the opening.   The said opening of the said skin side sheet | seat is formed in the thin area | region of this hollow part which is the thickness of 70% or less of the thickness of the part except the said hollow part in the said skin side sheet | seat. The disposable diaper of Claim 1.   5. The disposable diaper according to claim 4, wherein the thin region of the recess has an annular shape, and the diameter thereof is 1.5 times or more the diameter of the opening. The skin-side sheet includes a fusion part in which the constituent fibers of the skin-side sheet are fused in the dent part,
The fusion part includes a part where the constituent fibers of the skin side sheet are melted and the constituent fibers are fused without gaps,
The disposable diaper according to any one of claims 1 to 5, wherein the opening is formed in the fusion part.   The disposable diaper according to any one of claims 1 to 6, wherein the affinity of the skin-side sheet for water in the depression is greater on the opening side than on the outer side of the opening. . The disposable diaper is arranged on the non-skin facing surface side of the non-skin side sheet in a state of extending in a lateral direction between the non-skin side sheet and the outer layer sheet and a hydrophobic outer layer sheet and the non-skin side sheet. A plurality of elastic members arranged intermittently in the longitudinal direction of the disposable diaper,
The disposable diaper according to any one of claims 1 to 7, wherein the opening of the skin side sheet is disposed between the elastic members adjacent in the vertical direction. The skin-side sheet includes a fusion part in which the constituent fibers of the skin-side sheet are fused in the dent part,
The skin side sheet and the non-skin side sheet are bonded via an adhesive,
The disposable diaper according to any one of claims 1 to 8, wherein a position where the adhesive is arranged overlaps with the fused portion of the skin side sheet.