JP5832761B2 - Absorbent wearing articles - Google Patents

Description

  The present invention relates to an absorbent wearing article that absorbs excrement, and more particularly to an absorbent wearing article that includes a liquid-absorbing structure having an absorbent core, a disposable diaper, an incontinence pad, and the like.

  Conventionally, an absorbent wearing article including a liquid-absorbing structure having an absorbent core is known. For example, Patent Document 1 discloses a mode in which the thickness dimension of the liquid-absorbent structure locally decreases gradually toward the front edge in at least the front waist region of the front and rear waist regions.

JP 09-84826 A

  In the absorbent wearing article disclosed in Patent Document 1, the thickness dimension of the liquid-absorbent structure is gradually reduced locally toward the front edge in the front waist region. The rigidity of the peripheral edge is relatively lower than in other regions, and the peripheral edge can be in close contact with the wearer's body to prevent leakage of bodily fluids.

  However, by having such a configuration, the vicinity of the front end edge of the liquid-absorbent structure can be brought into close contact with the wearer, but the ears on both sides of the liquid-absorbent structure located in the groin portion of the wearer Can not be in close contact with the body. The ears on both sides of the liquid-absorbent structure are easily separated from the wearer's body due to wrinkles and bends due to the movement of the wearer's groin, leading to more fluid leakage than near the front edge It can also be a cause. In addition, even if the thickness dimension of the ears on both sides of the liquid-absorbent structure is gradually reduced to make its rigidity relatively low, it should closely adhere to the movement of the wearer's groin and follow that movement. I can't.

  The subject of this invention is related with provision of the absorptive wear article which can make the both ears of a liquid-absorbent structure closely_contact | adhere to a wearer's groin part in a front waist area, and can prevent side leakage of a bodily fluid reliably.

  In order to solve the above-mentioned problem, the present invention has a longitudinal direction and a lateral direction orthogonal thereto, a skin facing surface and a non-skin facing surface, a front waist region, a rear waist region, The absorbent article includes a crotch region located between the front and rear waist regions, and a liquid-absorbent structure having at least an absorbent core extending from the crotch region to the front and rear waist regions.

The present invention is characterized in that the liquid-absorbent structure has a central portion extending from the crotch region to the front waist region at least on the front waist region side of the front and rear waist regions, and the central portion. Both lateral ears located outward in the lateral direction, the rigidity of the both ears is lower than the rigidity of the central portion,
A pair of crotch central elastic elements adjacent to the central portion and extending in the vertical direction along the central portion extend from the vicinity of the central portion of the crotch region to the front waist region and are located on the non-skin facing surface side. The crotch central elastic element is in contact with the bottom surface of the liquid-absorbent structure, and the crotch center elastic element intersects the both-side ears of the liquid-absorbent structure in the front waist region, and the absorbent region in the crotch region. A non-intersecting portion that does not intersect with the liquid structure, wherein the mass per unit area of the absorbent core in the both ears is the absorbent core in the central portion Less than the mass per unit area, the both side ears of the liquid-absorbent structure has an inclined shape whose thickness dimension gradually decreases toward the outside in the lateral direction, In the inclined shape is maintained even in a state that has absorbed liquid.

  In one embodiment of the present invention, the longitudinal dimension of the intersecting portion of the crotch central elastic element is about 5 to 20% of the longitudinal dimension of the non-intersecting portion.

  In still another embodiment of the present invention, the liquid-absorbent structure includes a front region located on the front waist region side, a rear region located on the rear waist region side, and the front rear portion. A narrower middle region, the both ears are formed in the front-rear region, and the intersecting portions of the crotch central elastic element intersect the two ears.

  In still another embodiment of the present invention, the liquid-absorbent structure includes a liquid-permeable top sheet positioned on the skin facing surface side and an impermeable liquid positioned on the non-skin facing surface side. A plurality of ridges extending in the longitudinal direction and a plurality of ridges extending alternately in parallel with the ridges on the skin-facing surface of the top sheet. And are formed.

  In still another embodiment of the present invention, the skin-facing surface side of the both-side ears of the liquid-absorbent structure is formed on an inclined surface.

In still another embodiment of the present invention, in the side flaps located on the laterally outward sides of the side edges of the liquid-absorbing structure, in parallel with the crotch central elastic element, and Crotch side elastic elements spaced apart in the transverse direction are provided in a given dimension so as to be contractible.

In still another embodiment of the present invention, there are fastener means for connecting both side edges of the front waist region and both side edges of the rear waist region, and the fastener means is at least the front waist region. A fastening element extending in the lateral direction on the outer surface, the fastening element crossing the front end of the absorbent structure and the crotch central elastic element does not intersect the fastening element.
In still another embodiment of the present invention, a plurality of crotch central elastic elements are arranged, and among the crotch central elastic elements, the elastic elements located inside the lateral direction are on the outside thereof. Elongation stress is lower than the elastic element located.

  According to the absorbent wearing article according to one or more inventions of the present application, the rigidity of both ears of the liquid-absorbent structure is lower than the rigidity of the central part at least in the front waist region, Since the central crotch elastic element extending in the longitudinal direction intersects, the ears on both sides are curved along the shape of the groin of the wearer, and the excrement leaks out from the ears on both sides. It is not.

The perspective view of the disposable diaper in 1st Embodiment shown as an example of the absorbent wear article of this invention. The expansion | deployment top view of a diaper. III-III sectional view taken on the line of FIG. The top view similar to FIG. 2 which shows only a liquid-absorbing structure and a crotch center elastic element with a continuous line. The figure which shows the wearing condition of a diaper. The top view similar to FIG. 4 in 2nd Embodiment. Sectional drawing similar to FIG. 3 in 3rd Embodiment.

<First Embodiment>
As shown in FIGS. 1 and 2, the diaper 10, which shows an example of the absorbent wearing article of the present invention, has a vertical axis P and a horizontal axis Q orthogonal thereto, a vertical direction Y parallel to the vertical axis P, and a horizontal axis Q. It has a parallel lateral direction X, a skin facing surface and a non-skin facing surface on the opposite side, a front waist region 11, a rear waist region 12, and a crotch region 13 located between the front and rear waist regions 11, 12. A diaper body 14 is provided. In FIG. 3, the thickness direction orthogonal to the vertical direction Y and the horizontal direction X is indicated by Z.

  The diaper main body 14 includes a front end edge 14a and a rear end edge 14b that extend straight in the lateral direction X, side edges 14c and 14d that are inwardly bent in the crotch region 13, and a top sheet 15 that is positioned on the skin facing surface side. And a liquid-impervious backsheet 16 that forms the outer shape of the diaper 10 and is located on the non-skin facing surface side, and a liquid-absorbent structure 17 interposed between the topsheet 15 and the backsheet 16. . An intermediate sheet 18 is disposed between the top sheet 15 and the liquid-absorbing structure 17, and a pair of barrier sheets 19 that are symmetrical with respect to the vertical axis P are provided on both sides of the skin facing surface of the top sheet 15. Is arranged.

The top sheet 15 can be formed from various fiber nonwoven fabrics having liquid permeability, for example, an air-through fiber nonwoven fabric having a mass of about 15 to 45 g / m ² , a porous plastic film, and a laminate sheet thereof.

The backsheet 16 is a known fiber nonwoven fabric having poor liquid permeability or liquid permeability, for example, a spunbond nonwoven fabric, a point bond nonwoven fabric, SMS (spunbond) having a mass in the range of about 10 to 40 g / m ^2. Melt blown / spun band) Can be formed from non-woven fabric, liquid-impervious plastic film, laminates thereof.

The intermediate sheet 18 can be formed from various known fiber nonwoven fabrics that are air permeable and liquid permeable, for example, an air-through nonwoven fabric having a mass of about 15 to 45 g / m ² , and improves cushioning properties against the wearer's skin. In addition, the body fluid is prevented from diffusing and the top sheet 15 and the liquid-absorbent structure 17 are separated to prevent the body fluid from flowing back to the top sheet 15 in a delusion. However, in the diaper 10, the intermediate sheet 18 may be omitted.

The barrier sheet 19 can be formed from a hydrophobic fiber nonwoven fabric, a moisture-permeable and leak-proof plastic film, a laminate thereof or the like. For example, as the nonwoven fabric, an SMS fiber nonwoven fabric or a span having a mass of about 10 to 30 g / m ² can be used. It can be formed from a bond fiber nonwoven fabric or the like.

  The liquid-absorbent structure 17 is wide in the lateral direction X from the front waist region 11 side of the crotch region 13 toward the front waist region 11, which is defined by front and rear end edges 17 a and 17 b and both side edges 17 c and 17 d. A central portion 21 that extends from the rear waist region 12 to the front waist region 11 through the crotch region 13 and both ears located on both sides of the central portion 21 in the lateral direction X in the front waist region 11 Part 22. 3 and 4, a boundary line 24 between the center portion 21 and the both side ear portions 22 is indicated by a one-dot chain line. Note that both ends of the front end edge 17a of the liquid-absorbing structure 17 are curved.

  The liquid-absorbent structure 17 is composed of an absorbent core formed by mixing superabsorbent polymer particles (SAP), fluff pulp, and optionally thermoplastic synthetic fibers (staple fibers) into a predetermined shape, and its shape retention A sheet having liquid diffusibility, for example, formed from a fiber non-woven sheet having liquid permeability, etc., covering the absorbent core for improving the property and liquid diffusibility. On the bottom surface of the liquid-absorbent structure 17, a leak-proof sheet 27 formed from a liquid-impervious plastic film or a liquid-impervious fiber nonwoven fabric is disposed. In addition, as long as there exists an effect of this embodiment of the postscript, the liquid absorptive structure 17 may be formed only from the absorptive core.

  As shown in FIG. 3, the mass per unit area of the liquid-absorbing structure 17 is constant, and both side ears 22 in the front waist region 11 of the liquid-absorbing structure 17 are outside from the inside in the lateral direction X. By having an inclined shape so that the thickness dimension gradually decreases as it goes in the direction, the skin facing surface side is formed as a slope, and both ears 22 have lower rigidity than the central part 21. Specifically, when the liquid-absorbing structure 17 absorbs a required amount of artificial urine, the average thickness H1 of the central portion 21 is about 12 to 15 mm, and the lateral direction X of both ears The average thickness dimension H2 at the substantially central portion is about 8 to 11 mm.

<Measuring method of thickness dimension of liquid-absorbing structure 17>
First, the superabsorbent polymer particle mass about 300 g / ^{m 2,} artificial urine entire diaper 10 from the topsheet 15 side including the liquid-absorbent structure 17 formed by mixing fluff pulp mass about 315 g / ^{m 2} ( For example, when 10 liters of ion-exchanged water is used as a base, it is immersed in a container into which 200 g of urea, 80 g of sodium chloride, 80 g of magnesium sulfate, 8 g of calcium chloride, and 1 g of a dye (blue) are injected. After leaving in this state for 5 minutes, the diaper 10 is taken out of the container, placed flat on a table with the skin facing side as the upper side, and left for 5 minutes. taking measurement. In addition, the thickness dimension H1 of the center part 21 calculates | requires the average dimension of the periphery on the basis of the center part vicinity of the vertical direction Y and the horizontal direction X, and the both-sides ear | edge part 22 follows the shape. A plurality of diagonal lines were drawn, and the thickness of the surrounding area was measured with reference to a portion where the diagonal lines intersect.

  In addition, unlike the present embodiment, by setting the mass per unit area of the absorbent core in the side ears 22 to be lower than the mass per unit area of the absorbent core in the center part 21, The thickness dimensions H1 and H2 can be formed substantially equal. In such a case, the thickness dimension H2 of the both-side ears 22 is substantially equal to the thickness dimension H1 of the central part 21, and there is no possibility that the absorbent core will be deformed or cracked due to the difference in thickness dimension.

  Further, by making the mass per unit area of the entire liquid-absorbent structure 17 constant, by forming a compression processing part having a pattern of a required shape, which is formed only from the central part 21 with a plurality of compression recesses. The rigidity of the both side ear portions 22 may be relatively lower than the rigidity of the central portion 21. Thus, as long as the following effects of the present invention are exhibited, it is sufficient that the rigidity of the both side ears 22 is formed lower than that of the central part 21, and this kind of rigidity can be used as long as it causes such a rigidity difference. The well-known structure normally used for the article of this and various well-known processing means can be used.

  Furthermore, a concave groove portion extending in the vertical direction Y may be formed in the boundary line 24 between the both side ear portions 22 and the central portion 21. In that case, the concave groove portion serves as a hinge, and as will be described later, it becomes easier to closely adhere both ears 22 to the wearer's body due to the elongation stress of the crotch central elastic element 28. .

  The both-side ears 22 of the liquid-absorbing structure 17 extend from the liquid-absorbing structure 17 and the leak-proof sheet 27 in a strand-like or string-like crotch center elastic element 28. Specifically, the crotch central elastic element 28 is in contact with the bottom surface of the liquid absorbent structure 17 and extends along and adjacent to the central portion 21 of the liquid absorbent structure 17.

  As shown in FIG. 4, the crotch central elastic element 28 extends from the rear waist region 12 side to the front waist region 11 of the crotch region 13, and both ears on the bottom surface of the liquid absorbent structure 17 on the non-skin facing surface side. And a non-intersecting portion 28B located outside the central portion 21 of the liquid-absorbing structure 17 in the lateral direction X in the crotch region 13. The crotch central elastic element 28 can be formed of, for example, an elastic material (elastic yarn) having a thickness of about 320 to 1240 dtex, preferably 620 to 940 dtex and an expansion ratio of about 1.5 to 2.5 times. The crotch central elastic element 28 is at least near the center of the crotch region 13, that is, the horizontal axis of the crotch region 13, although it depends on the length dimension of the intersecting portion 28A as long as the effects of the present invention described later are exhibited. What is necessary is just to extend to the front waist area 11 from the vicinity of Q.

  Further, in the present embodiment, one crotch center elastic element 28 intersects with the one-side ear portion 22, but a plurality of crotch center elastic elements 28 may be disposed and intersect. In the case where a plurality of crotch center elastic elements 28 are arranged so as to intersect with both ears 22, the elastic material constituting the same is located inward in the lateral direction X of both ears 22. The elastic material preferably has a lower elongation stress than that located outside. That is, when the elongation stress of the elastic material located outward in the lateral direction is relatively high, the both-side ears 22 have an inclined shape that becomes a downward slope toward the outward in the lateral direction. This is because the outer part is strongly in close contact with the body and the inner part is lifted relatively, which may cause leakage of body fluids.

The leak-proof sheet 27 is a moisture-permeable and leak-proof plastic film, a liquid-impervious SMS (spunbond / meltblown / spunbond) fiber nonwoven fabric having a mass of about 10 to 30 g / m ² , a spunbond fiber nonwoven fabric, and a laminate thereof. It can be formed from a sheet.

  Referring to FIG. 2 again, the diaper main body 14 includes front and rear end flaps 30 and 31 extending in the lateral direction X on the outer side in the vertical direction Y of the front and rear end edges 17a and 17b of the liquid-absorbing structure 17. A pair of side flaps 32 extending in the vertical direction Y are provided outside the lateral edges X of both side edges 17 c and 17 d of the liquid-absorbing structure 17. The front and rear end flaps 30 and 31 extend from the front and rear end edges 17a and 17b of the liquid-absorbent structure 17 outward in the longitudinal direction Y, the barrier sheet 19, the top sheet 15, the leak-proof sheet 27, and the back sheet. 16 are formed to overlap each other. Further, the side flap 32 extends outward in the lateral direction X of the side edges 17c and 17d of the liquid-absorbent structure 17, and includes a top sheet 15, a barrier sheet 19, a leak-proof sheet 27, and a back sheet 16. Are overlapped with each other.

  A fixing portion 35a of a pair of tape fastener tabs 35 is interposed between both side edges of the barrier sheet 19 and the back sheet 16 of the rear side flap 33 where the rear end flap 31 and the side flap 32 intersect. It is fixed to them via hot melt adhesive (not shown) applied to the inner surfaces of both sheets 16 and 19. A first fastening element having a hook group of mechanical fasteners on a free portion 35b of the tape fastener tab 35 extending outward in the lateral direction X from the side edge of the rear side flap 33 (side edge of the rear waist region 12). 36 is provided. When the diaper 10 is worn, the first fastening element 36 is releasably fastened to the second fastening element 37 having a loop group of mechanical fasteners extending in the lateral direction X on the outer surface of the front waist region 11. An opening 38 and a pair of leg openings 39 are defined (see FIG. 1). The second fastening element 37 has a band-like shape having a larger width dimension than the first fastening element 35, and crosses the front end portion of the liquid-absorbing structure 17.

  Between the top sheet 15 forming a part of the rear end flap 31 and the leak-proof sheet 27, there is an elastic waistband 41 formed of a band-shaped elastic rebound member having cushioning properties such as urethane foam having open cells. It is arranged. Further, a plurality of strand-like or string-like crotch side elastic elements 42 are disposed between the back sheet 16 and the barrier sheet 19 forming a part of the side flap 32 so as to be contractible in the longitudinal direction Y. The two sheets 16 and 19 are joined to each other via a hot melt adhesive (not shown) applied to the inner surfaces.

  The barrier sheet 19 includes a proximal edge portion 44 that forms a part of the side flap 32, a skin facing surface of the top sheet 15 in the front and rear waist regions 11 and 12, and an outer side in the lateral direction X from the top sheet 15 of the back sheet 16 The front and rear fixed end portions 45 and 46 are fixed to the skin-facing surface of the portion extending in the direction of the skin with a hot melt adhesive (not shown), and the front and rear fixed end portions 45 and 46 extend in the vertical direction Y. And a distal edge 47 formed by folding the inner edge of the burr sheet 19 inward. The distal edge 47 is provided with a strand-like or string-like cuff elastic element 48 extending in the longitudinal direction Y so as to be contractible in the longitudinal direction Y. The distal edge 47 is separated from the skin-facing surface of the top sheet 15 by the contraction action of the cuff elastic element 48 when the diaper 10 is worn, and a pair of leak-proof cuffs for preventing side leakage of excrement are formed. The

  FIG. 5 is a side view showing a wearing state of the diaper 10. 4 and 5, only the liquid-absorbing structure 17 and the crotch central elastic element 28 among the constituent members of the diaper main body 14 are indicated by solid lines, and the other constituent members are indicated by virtual lines.

  As shown in FIG. 4, in the front waist region 11, the intersecting portion 28 </ b> A of the crotch central elastic element 28 extends on the non-skin facing surface of the both-side ears 22 of the liquid-absorbing structure 17. The extension stress by the crotch central elastic element 28 is directly acting on the both side ears 22 of the structure 17. Moreover, in the both-sides ear | edge part 22 of the liquid absorptive structure 17, since the thickness dimension is reducing gradually from the inner side of the horizontal direction X to outer side as shown in FIG. Is lower in rigidity than the central portion 21, and due to these configurations, the diaper 10 of the present invention has the following effects.

  As shown in FIG. 5, the both-side ears 22 of the liquid-absorbent structure 17 are portions facing the wearer's groin. During wearing, the part is a part that is wrinkled or bent by the movement of the wearer's groin, and is easily separated from the wearer's body, and there is a probability that fluid leaks from the part. high. In the embodiment of the present invention, the both-side ears 22 of the liquid-absorbing structure 17 have an inclined shape in which the thickness dimension gradually decreases from the inner side to the outer side in the lateral direction X and has a relatively low rigidity. It is easy to present a curved shape along the shape of the wearer's body, and since the intersecting portion 28A of the crotch central elastic element 28 extends to the both side ear portions 22, The ears 22 on both sides can be brought into close contact with the wearer's body, and side leakage of body fluid can be reliably prevented.

  Actually, in the crotch central elastic element 28, the intersecting portion 28 </ b> A that overlaps the liquid absorbing structure 17 is a portion in which the extension force is suppressed by its rigidity. The non-intersecting portion 28B not intersecting the sex structure 17 is extended in a curved shape in the crotch region 13, so that the extension stress is applied to the intersecting portion 28A, so that both ears 22 are attached to the wearer's body. It can be adhered. In addition, although the area | region which does not overlap with the cross | intersection part 28A of the crotch center elastic element 28 is formed in the both-sides ear | edge part 22 of the liquid absorptive structure 17, when the one part closely_contact | adheres to a body, Separation of the entire portion 22 from the wearer's body can be suppressed, and side leakage of body fluid can be prevented.

  Moreover, although embodiment of this invention is applicable also to wearing articles, such as a pants-type disposable diaper, besides what is called an open-type disposable diaper, in the case of an open-type disposable diaper, it shows in FIG. As described above, the second mechanical fastener having a band shape is formed on the outer surface of the region other than the portion overlapping the intersecting portion 28A of the crotch central elastic element 28 in the both side ear portions 22, that is, the outer surface (front end portion) located above the region. Element 37 is located. Therefore, since the upper end portion is pressed against and closely contacts the wearer's body side by fastening the second fastening element 37 and the first fastening element 36 of the tape fastener tab 35, the region is the wearer's body. The entire ears 22 on both sides can be fitted to the wearer's body without being separated from the body.

  Further, as shown in FIG. 4, the crotch side elastic element 42 extends in the longitudinal direction Y in parallel with the crotch central elastic element 28, and a part of the extending action is the both side ears 22 of the liquid absorbent structure 17. It is also considered that it contributes to the formation of the curved shape. Therefore, it can be said that the crotch center elastic element 28, the second fastening element 37, and the crotch side elastic element 42 cooperate to bring the entire side ears 22 into close contact with the wearer's body.

  In order to achieve such an effect, the elongation stress of each crotch central elastic element 28 is 93% when the expansion force acts in the expansion / contraction region (when the maximum elongation of the crotch central elastic element 28 is 100%), It is preferably about 0.2 to 0.8N. In the case of 0.2 N or less, the both-side ears 22 of the liquid-absorbing structure 17 cannot be bent along the wearer's body. This is because the liquid absorption performance of the ear portion 22 is hindered, and the body fluid is not sufficiently absorbed, which may cause a side leak.

<Measurement Method of Elongation Stress of Crotch Center Elastic Element 28>
The elongation stress of the crotch central elastic element 28 is measured using a tensile tester (manufactured by Shimadzu Corporation, Autograph AGS-1 kW) under the conditions of an initial separation dimension of 250 mm between the upper and lower chucks and a tensile speed of 100 mm / min. Specifically, first, a predetermined width (specifically, each having a width of about 5 mm on the outer sides of both sides of the crotch central elastic element 28 in the lateral direction X. The crotch central elastic element 28 has a plurality of elasticities. The same applies to the case where the crotch central elastic element 28 is provided. (However, the liquid-absorbing structure is removed) and is fixed between the chucks in a contracted state. The elongation stress in the stretchable region in a state of being stretched to 93% is calculated.

  In the embodiment of the present invention, when a normal M size (vertical length dimension 420 to 480 mm) of the infant disposable diaper 10 is targeted, the length dimension L1 of the liquid absorbent structure 17 in the vertical direction Y is shown. (Separation dimension in the longitudinal direction Y between the front edge 17a and the rear edge 17b) is about 320 to 360 mm, and the length dimension W1 in the lateral direction X between the side edges 17c and 17d in the central portion 21 is about 80 to 100 mm. The separation dimension W2 in the lateral direction X between the side edges 17c and 17d of the ear portion 22 is about 90 to 120 mm. Further, the length dimension L2 in the longitudinal direction Y of the both-side ears 22 of the liquid-absorbent structure 17 is about 100 to 160 mm, and the length dimension W3 in the lateral direction X of the one-side ears 21 in the front waist region 11 is about 15-40 mm.

  The length dimension L3 in the longitudinal direction Y of the crotch central elastic element 28 is about 210 to 230 mm, and the length dimension L4 in the longitudinal direction Y of the intersecting portion 28A of the crotch central elastic element 28 is about 30 to 50 mm. The length dimension L5 in the longitudinal direction Y of the non-intersecting portion 28B is about 160 to 200 mm. Further, the separation dimension W4 in the lateral direction X between the side edges 17c, 17d of the central portion 21 and the non-intersecting portion 28B of the crotch central elastic member 28 is about 3 to 20 mm.

  In the crotch central elastic element 28, the length L4 in the longitudinal direction Y of the intersecting portion 28A is about 25% or less, preferably 20%, of the length L5 in the longitudinal direction Y of the non-intersecting portion 28B. % Or less, about 5% or more, preferably about 8% or more. When the length dimension L4 of the intersecting portion 28A is 25% or more of the length dimension L5 of the non-intersecting portion 28, the wearer wears the both ears 22 of the liquid-absorbing structure 17 by the elongation stress of the non-intersecting portion 28B. This is because it cannot be curved along the shape of the body, and the ears 22 on both sides are separated from the wearer's body, and there is a risk of causing side leakage of excreta. If it is 5% or less, the extension stress acting on the intersecting portion 28A is concentrated locally, compressing the liquid-absorbing structure more than necessary, and causing cracks in a part of the liquid-absorbing structure. There is a possibility that the liquid absorption performance of the conductive structure may be lowered.

Further, the length dimension L4 in the longitudinal direction Y of the intersecting portion 28A of the crotch central elastic element 28
Is preferably about 15 to 36% of the length L2 in the longitudinal direction Y of the ears 22 on both sides. In the case of 15% or less, since the part where the elongation stress of the crotch central elastic element 28 acts on the entire ears 22 is too local, the entire ears 22 may be curved along the wearer's body. It is not possible. On the other hand, when it is 36% or more, the intersecting portion 28A intersects the entire side ears 22 and when the tip of the intersecting portion 28A is located further above the both ears 22, the non-intersecting portion 28B. This is because the crossing portion 28A may be wound around the entire side ear portions 22 and may be lowered downward. Further, when the crotch center elastic element 28 is positioned forward (upward) from both ears 22 and extends to a position intersecting with the second fastening element 37 arranged on the outer surface, the second fastening element 37 On the other hand, since the force which pulls it down acts and there exists a possibility that the whole diaper 10 may slide down, it is unpreferable.

  As shown in FIG. 4, the lower edge 49 of both ears 22 has an arc shape that is concave inward, and by having such a shape, both ears 22 are in close contact with the wearer's buttocks. When this is done, it is possible to exhibit a more curved shape along the shape. Specifically, it is preferable that the angle α of the lower side edge 49 with respect to the boundary line 24 is a curved shape with about 45 to 60 °. When the angle α is 45 ° or less, the lower end portions of the both side ear portions 22 are pointed and cannot be curved along the wearer's body, and when the angle α is 60 ° or more. Has a relatively wide lower end of the ears 22 on both sides, and the extension stress due to the intersecting portion 28A of the central crotch elastic element 28 does not sufficiently act, and there is a possibility that a part thereof is separated from the wearer's body. This is because in any case, there is a risk of leakage of bodily fluids.

  Referring to FIG. 3 again, in this embodiment, the both-side ears 22 of the liquid-absorbent structure 17 have a flat non-skin facing surface and the skin facing surface faces outward in the lateral direction X. However, the skin facing surface and the non-skin facing surface may both be inclined toward the center of the diaper as going outward in the lateral direction X. Thus, when both ears 22 become thinner as going outward in the lateral direction X, the outer edge thereof is more closely attached to the wearer's skin, and can be prevented from being separated from the wearer's body. it can. Moreover, as long as the thickness dimension H2 is small compared with the center part 21, the both-sides ear part 22 does not have an inclined shape in which the thickness dimension H2 gradually decreases. A step may be formed in the vicinity of the boundary line 24.

<Method for Forming Absorbent Core of Liquid Absorbent Structure 17>
The following method can be considered if the formation method of the absorptive core of the liquid absorptive structure 17 in the manufacturing process of the diaper 10 is described.

  First, a manufacture having a duct filled with absorbent / discrete materials such as pulp fiber and superabsorbent polymer, and a plate having a plurality of recesses for accumulation in the machine direction located below the duct. In the apparatus, an absorptive / discrete material is accumulated from a duct in a recess for accumulation to form an aggregate (absorbent core). The plate has a mesh shape having a plurality of apertures at the lower portion thereof, and absorbs and disperses the absorbent and discrete materials through the apertures in the recesses for accumulation.

  A first concave portion corresponding to the central portion 21 of the absorbent core extending in the machine direction in the integrated concave portion of the plate, and about 15 mm in the cross direction perpendicular to the machine direction from the first concave portion (the width of both ears 22) 2nd concave part corresponding to the both-sides ear | edge part 22 extended (equivalent to the dimension W3) is formed. Since the absorbent / discrete material supplied from the duct concentrates in the central portion of the accumulation concave portion, the accumulation amount accumulated in the second concave portion tends to be smaller than that of the first concave portion. Thus, the mass per unit area of the both side ears 22 can be made smaller than that of the central part 22. Further, in order to surely reduce the mass per unit area of both ears 22 as compared with the central part 21, the depth of the second concave part (thickness dimension of the integrated concave part) or / and the bottom part You may make the opening area, mesh degree, etc. of the formed opening small compared with a 1st concave part. Further, as in the present embodiment, in order to make the both-side ears 22 have an inclined shape, the depth, opening area, and mesh degree of the second concave portion are set to the first concave portion side (inward side). ) From the outside toward the outside, and preferably continuously and gradually become smaller.

  As shown in FIG. 3, in the crotch region 13, the separation dimension W <b> 5 in the lateral direction X between the inner edges 44 a (base ends of the barrier cuff) of the proximal edge 44 of the barrier sheet 19 is about 120 to 140 mm, The base end portion 44 a of the barrier cuff is located outward in the lateral direction X of the intersecting portion 28 </ b> A of the crotch central elastic element 28. When the base end portion 44 a of the barrier cuff is positioned inward in the lateral direction X of the crotch central elastic element 28, both ears 22 of the liquid absorbent structure 17 are worn by the wearer by the contraction action of the crotch central elastic element 28. The base end 44a of the barrier cuff is wound when bending toward the body side (upper drawing) and is worn before the distal edge 47 of the barrier sheet 19 is separated from the top sheet 15 by the extension stress of the cuff elastic element 48. Since it will be in the state contact | abutted to a person's body, the barrier cuff for preventing the side leakage of excrement cannot fully be formed.

  On the other hand, in the present embodiment, since the base end portion 44a of the barrier cuff is positioned outward in the lateral direction X of the crotch central elastic element 28, both side ears 22 of the liquid-absorbing structure 17 are connected to the crotch central elastic element. Even if it is curved toward the wearer's body due to the elongation stress of 28, the proximal end portion 44a of the barrier cuff is not caught, and the barrier cuff is raised by the contraction action of the cuff elastic element 48, so that the leakage of the excrement can be sufficiently prevented. It can fulfill its function as a proposal.

Second Embodiment
FIG. 6 is a plan view similar to FIG. 4 of the disposable diaper according to the second embodiment of the present invention. However, since the basic configuration of the disposable diaper 10 is the same as that of the first embodiment, only the differences will be described below.

  As shown in FIG. 6, the liquid-absorbent structure 17 of the present embodiment includes a front region 50 located in the front waist region 11, a rear region 51 located in the rear waist region 12, and the front and rear regions 50 and 51. A relatively narrow intermediate zone 52 located and extending in the longitudinal direction Y. The front and rear regions 50 and 51 are wider than the intermediate region 52, and both side ears 22 extending outward from the central portion 21 in the lateral direction X are formed.

  Moreover, although not shown in figure, the both-sides ear | edge part 22 of the front back area 50 and 51 has an inclined shape from which the thickness dimension reduces gradually as it goes to the outward from the inner side of the horizontal direction X, and the one part The crotch center elastic element 28 that extends from the crotch region 13 to the front and rear waist regions 11 and 12 intersects. That is, the crotch central elastic element 28 does not intersect the liquid absorbing structure 17 in the crotch region 13 and the intersecting portion 28A that intersects the both ears 22 of the front and rear regions 50 and 51 of the liquid absorbing structure 17. And a non-intersection portion 28B. Thus, the both-sides ear | edge part 22 which comprises the same structure as 1st Embodiment is formed in the front back area 50 and 51, Therefore The liquid-absorbent structure 17 is not only in the front waist area 11 but in the back waist area 12. The side ears 22 can be curved along the shape of the wearer's body, and side leakage of excrement can be effectively prevented in the front and rear waist regions 11 and 12.

<Third Embodiment>
FIG. 7 is a cross-sectional view similar to FIG. 3 of the disposable diaper 10 according to the third embodiment of the present invention. Since the basic structure of the disposable diaper 10 of this embodiment is substantially the same as that of the first embodiment, only the differences will be described below.

  As shown in FIG. 7, the disposable diaper 10 of the present embodiment includes a plurality of ridges 55 in which the top sheet 15 extends in the vertical direction on the skin facing surface, and the ridges 56 positioned between the ridges 55. It is formed from the fiber nonwoven fabric sheet which has. The fibers forming the top sheet 15 are randomly oriented in all directions (including a three-dimensional direction), and the uneven shape is a gas from a nozzle disposed on the continuous fiber web forming the top sheet 15. Can be formed by spraying, water jet treatment, steam jet treatment, press working or gear working. Therefore, it can be said that the ridge 55 is a high density region compared to the ridge 56.

  As described above, the high density regions (projections) 55 and the low density regions (concaves) 56 extending in the longitudinal direction Y on the top sheet 15 are alternately formed in the longitudinal direction Y. The top sheet 15 is easily bent in the vertical direction Y. That is, when the both-side ears 22 of the liquid-absorbing structure 17 are bent by the elongation stress of the crotch central elastic element 28, the top sheet 15 easily follows and the both-side ears 22 are more easily attached to the wearer's body. The shape can be fitted to.

The mass of the top sheet of this embodiment is 20 g / m ² or more, preferably 25 g / m ² or more, and its thickness dimension is about 0.5 mm or more, preferably 0.8 mm or more. If the mass of the top sheet is 20 g / m ² or less and the thickness dimension is 0.5 mm or less, even if it has the ridges 55 and 56, the liquid absorbing structure It does not contribute to the formation of the curved shape of the ears 22 on both sides of the body 17, and even if it contributes, the effect is extremely weak.

  Further, although not shown, by forming the high density portions and the low density portions alternately arranged in the longitudinal direction Y in the concave stripes, that is, the correlation of the rigidity values in the concave and convex stripes 55 and 56, By making 55> high density portion of the groove 56> low density portion of the groove 56, the top sheet 15 may be more easily curved along the shape of the wearer's body. Moreover, in this embodiment, although the uneven | corrugated strips 55 and 56 are extended in parallel with respect to the vertical axis | shaft P, it bends of the both-sides ear | edge part 22 of the liquid absorptive structure 17 by forming so that it may incline to it. It is also possible to adjust the direction to be performed.

  In addition to the materials described in this specification, various known materials that are usually used in this type of field can be used for each component of the diaper 10 without limitation. Further, the embodiment is not limited to the embodiment described in the above specification and the drawings. For example, the embodiment is described in each claim (excluding claim 1) described in the claims. The embodiment includes a combination of technical matters.

10 Absorbent wearing articles (disposable diapers)
11 Front waist region 12 Rear waist region 13 Crotch region 15 Top sheet 16 Back sheet 17 Liquid-absorbing structure 21 Central part 22 Both side ears 28 Crotch center elastic element 28A Intersection part 28B Crotch center elastic element Non-inseam center elastic element Intersection 32 Side flap 37 Second fastening element (fastening element)
42 Inseam side elastic element 50 Front area 51 Rear area 52 Middle area 55 Convex line 56 Concave line H2 Thickness dimension X on both sides of the liquid-absorbent structure X Horizontal direction Y Vertical direction Z Thickness direction

Claims (8)

It has a longitudinal direction and a lateral direction perpendicular thereto, a skin facing surface and a non-skin facing surface, and a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, and the crotch region as a center In an absorbent wearing article comprising a liquid-absorbent structure having at least an absorbent core extending in the front and rear waist region,
The liquid-absorbing structure is positioned at least on the front waist region side of the front and rear waist regions, a central portion extending from the crotch region to the front waist region, and outward in the lateral direction from the central portion. Both side ears, the rigidity of the both side ears is lower than the rigidity of the central part,
A pair of crotch central elastic elements adjacent to the central portion and extending in the vertical direction along the central portion extend from the vicinity of the central portion of the crotch region to the front waist region and are located on the non-skin facing surface side. Abutting the bottom surface of the liquid-absorbent structure,
The crotch central elastic element includes an intersecting portion that intersects the both side ears of the liquid-absorbing structure in the front waist region, and a non-intersecting portion that does not intersect the liquid-absorbing structure in the crotch region. Have
In the liquid absorbent structure, the mass per unit area of the absorbent core in the both side ears is lower than the mass per unit area of the absorbent core in the central portion,
The both side ears of the liquid-absorbent structure have an inclined shape in which the thickness dimension gradually decreases as it goes outward in the lateral direction, and the inclined shape is also in a state of absorbing body fluid. The absorbent wearing article, which is maintained .   The absorbent wearing article according to claim 1, wherein a length dimension in the longitudinal direction of the intersecting portion of the crotch central elastic element is about 5 to 20% of a length dimension in the longitudinal direction of the non-intersecting portion. The liquid-absorbent structure has a front region located on the front waist region side, a rear region located on the rear waist region side, and an intermediate region narrower than the front rear portion, and the front and rear The absorptive wearing article according to claim 1 or 2 , wherein the both side ears are formed in a region, and the intersecting portions of the crotch central elastic element intersect with the both side ears. The liquid-absorbent structure is interposed between a liquid-permeable top sheet located on the skin facing surface side and a liquid-impermeable back sheet located on the non-skin facing surface side, the skin-facing surface of the topsheet, and plural rows ridges extending in the longitudinal direction, any one of claims 1 to 3 and plural rows of concave stripes extending in parallel to the ridge and alternately are formed Absorbent wearing articles described in 1. The absorptive wearing article according to any one of claims 1 to 4 , wherein the both-side ears of the liquid-absorbent structure are formed such that the skin facing surface side is an inclined surface. In the side flaps located on the laterally outward sides of the both side edges of the liquid-absorbent structure, there are crotch side elastic elements parallel to the crotch central elastic element and spaced apart from each other in a given dimension in the lateral direction. The absorptive wear article according to any one of claims 1 to 5 arranged so that contraction is possible. Fastener means for connecting both side edges of the front waist region and both side edges of the rear waist region, the fastener means having fastening elements extending in the lateral direction at least on the outer surface of the front waist region; The absorbent wearing article according to any one of claims 1 to 6 , wherein the fastening element crosses a front end portion of the liquid-absorbing structure, and the crotch central elastic element does not intersect the fastening element. A plurality of the crotch center elastic elements are arranged, and an elastic element located on the inside in the lateral direction of the crotch center elastic elements has a lower elongation stress than an elastic element located on the outside thereof. The absorbent wearing article according to any one of 7 above.

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