JP5536413B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as disposable diapers, sanitary napkins, incontinence pads, and incontinence liners.

  As an element for improving the comfort in wearing disposable diapers, increasing the moisture permeability of the material constituting the diaper can be mentioned. For example, a film material having moisture permeability is used for the back sheet on the non-skin surface side of the absorbent body, or the exterior material on the non-skin surface side is made of a non-woven fabric that does not impair the moisture permeability of the back sheet. Some ideas have been made. On the other hand, the fitting property of the diaper with respect to a body is mentioned as another element which improves the comfort at the time of wear. By improving this fit, we would like to improve the leak-proof property of excrement, and ideally to make it feel like wearing normal underwear without any discomfort. From this point of view, especially in adult diapers, the amount of fluid excreted by the wearer is large, and the internal absorbent body tends to be large and thick. Is not easy.

Patent Documents 1 and 2 disclose a material in which an elastic member is bonded and fixed between an absorbent core and a back sheet of a diaper in order to improve the fit of a crotch part.
Patent Document 3 is composed of pants and a liquid-absorbing pad located on the inner surface of the pants, and a stretchable elastic member extending in the vertical direction is attached to the outer surface of the back sheet forming the pad in an extended state. Disposable diapers are disclosed in which the pad is lifted upward from the inner surface of the pants by contraction. Thereby, even if a pad can be stuck to a wearer's skin and pants slip | deviate down, it is supposed that the contact | adherence state of a pad can be maintained independently from this.

JP 59-66501 A JP-A-63-288201 JP 2003-62009 A

The techniques disclosed in Patent Documents 1 and 2 are based on the premise that the absorbent core and the back sheet are bonded to each other with an adhesive, so that moisture permeability at this portion is lost. Further, since the absorbent body and the elastic member are directly bonded, it is conceivable that the absorbed body fluid moves and contacts the bonded surface, thereby causing the elastic member to peel off. Moreover, in the technique of patent document 3, since a motion of a pants part and a pad part is parted, when wearing pants etc. on a diaper typically like an adult diaper, an internal pad is on the contrary. It may hit the skin too much, causing the absorbent pad to be hard to tear or squeeze between the pants and the wearer at the crotch.
An object of the present invention is to provide an absorbent article that has high moisture permeability, is not easily stuffy, and has high fit along the body. In particular, it is an object of the present invention to provide an absorbent article that can achieve high moisture permeability and fit at the same time even if the absorbent article has a thick absorbent body with low flexibility.

The present invention comprises a top sheet disposed on the skin contact surface side and a back sheet disposed on the non-skin contact surface side, comprising an abdominal side portion, a back side portion, and a crotch portion positioned between the two portions. And a width perpendicular to the longitudinal direction from the abdominal side to the back side through the crotch portion, comprising an absorbent body interposed between the two sheets and disposed from the abdominal side to the back side. An absorbent article having a direction,
The back sheet has an outer sheet provided with a moisture permeable sheet on the absorber side and two or more nonwoven layers covering the non-skin contact surface side, and a plurality of elastic layers are provided between the two nonwoven layers. The members are arranged extending in the longitudinal direction of the absorbent article, and both the nonwoven fabric layers are joined via the elastic member. On the other hand, the outer sheet and the moisture-permeable sheet are disposed at a position where the elastic member is present. A joining portion extending in the longitudinal direction of the absorbent article to be joined is arranged, and there is a moisture permeable region extending in the longitudinal direction showing moisture permeability connected to the outside of the absorbent article from the absorbent body via the moisture permeable sheet and the exterior sheet. An absorbent article is provided. Moreover, this invention consists of a stomach part located between a stomach side part, a back side part, and these both parts, and the moisture permeable sheet distribute | arranged to the skin surface side, and two or more layers which coat | cover the non-skin surface side A wearing cover having a longitudinal direction viewed from the abdominal side part to the back side part through the crotch part and a width direction perpendicular to the longitudinal direction. A plurality of elastic members are arranged extending in the longitudinal direction of the absorbent article, and both the nonwoven fabric layers are joined via the elastic members, while the elastic sheet is located at the position where the elastic members are located. A linear joint extending in the longitudinal direction of the absorbent article for joining the moisture permeable sheet is arranged, and the longitudinal direction showing moisture permeability connected from the absorbent body to the outside of the absorbent article through the moisture permeable sheet and the exterior sheet Providing a wearing cover with a moisture-permeable area extending in the direction A.

  The absorptive article of the present invention has the outstanding operation effect of having high moisture permeability, being hard to be stuffy, and having high fit along the body. In particular, even an absorbent article provided with a thick absorbent body with low flexibility can achieve both high moisture permeability and good fit.

It is a partially notched perspective view which shows typically the shape just before wearing the disposable diaper as one Embodiment in this invention (Before engaging the fastening tape of one side). FIG. 2 is a partially cutaway development plan view seen from the skin contact surface side of the disposable diaper shown in FIG. 1. FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2. It is the cross-sectional schematic diagram which showed the cross section in the position of a median line in the state which wore the disposable diaper of this invention.

Hereinafter, preferred embodiments of the present invention will be shown and described in detail with reference to the drawings.
FIG. 1 is a partially cutaway perspective view schematically showing the shape immediately before wearing a disposable diaper for adults as an embodiment of the absorbent article according to the present invention (before fastening a fastening tape on one side). FIG. 2 is a partially cutaway development plan view seen from the skin contact surface side of the disposable diaper shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  The disposable diaper 10 in the present embodiment includes a ventral side portion F, a back side portion R, and a crotch portion C positioned between the two portions, and is a liquid-permeable top sheet 1 disposed on the skin contact surface side. And a leak-proof back sheet 2 disposed on the non-skin contact surface side, and an absorber 3 interposed between the two sheets. The disposable diaper 10 in this embodiment comprises a waist opening Wo and a pair of leg openings Lo in the shape when worn. When the diaper main body is divided into an in-plane region, the diaper is composed of a region where the absorber 3 is disposed and a flap portion extending outward. A pair of left and right front side flaps Sf and rear side flaps Sr are formed at both ends in the longitudinal direction of the diaper in the width direction orthogonal to the diaper. It has a fastening tape 4. At the time of wearing, the back side portion R is arranged on the back side of the wearer, and I and the abdomen side portion F are attached to the wearer's lower abdomen so that the crotch portion C is along the crotch. Next, for fixing, the rear side flap Sr is placed on the ventral side from the back, and the rear side flap Sr is overlaid on the front side flap Sf. The fastening tape 4 is pressed against a landing tape (not shown) and engaged with a mechanical fastener or the like (not shown) provided on the fastening tape 4. In the present embodiment, the absorbent body 3 in the longitudinal direction is slightly shortened so that the ventral side does not reach the diaper edge, and a front flap is formed. The “longitudinal direction” in the disposable diaper 10 of the present embodiment is the X direction in FIG. 2, and when worn, the direction is worn from the lower abdomen to the buttocks, and the “width direction” is Y in FIG. It is a direction and it is worn with its direction facing the line connecting the left and right legs. In FIG. 2, circles indicated by alternate long and short dash lines indicate a urination point 72 ′ and a defecation point 73 ′, which are the urination point 72 (external urethral opening) and the defecation point 73 (anus) in the wearer's body ( These regions are substantially the same as those shown in FIG.

  Although details regarding the materials of the top sheet 1, the moisture-permeable back sheet 2 and the absorber 3 will be described later, in the present embodiment, the top sheet 1 quickly absorbs excreted body fluid and transmits it to the absorber. A hydrophilic air-through nonwoven fabric is used from the viewpoint of softness. Moreover, as the absorbent body 3, an absorbent core (not shown) composed of pulp fiber, absorbent polymer or the like is used, and the moisture permeability of the non-skin contact surface side of the absorbent core and the moisture permeable sheet is possible. In order not to be damaged as much as possible, the bonded portion and the non-bonded portion are joined together. As the bonding method, a method of applying an adhesive so that a plurality of lines are parallel (bead coating), a method of coating in a dot shape, a method of coating in a spiral shape (spiral coating), a porous shape And the like (porous coating method). It is preferable that 10 to 80%, preferably 30 to 60% of the area of the moisture permeable sheet in the region where the absorbent core and the moisture permeable sheet overlap is an adhesive part. By doing in this way, the favorable moisture permeability between the absorber 3 and the moisture-permeable sheet 21 is ensured. In the present embodiment, “moisture permeability” means that vaporized water (water vapor) does not pass through liquid water, and may include the concept of “ventilation” through which air passes. The absorbent core may have a configuration in which an absorbent material (absorbing polymer, pulp, or the like) is wrapped with a covering sheet such as a pulp sheet or a non-work cloth sheet. In this case, the cover sheet of the absorbent core and the moisture permeable sheet are joined as described above.

  FIG. 3 is an enlarged cross-sectional view taken along the line III-III in FIG. 2. FIG. 3B is a further enlarged view of the region T in FIG. The moisture-permeable back sheet 2 includes a moisture-permeable sheet 21 on the skin contact surface side and an exterior sheet 22 that covers the non-skin contact surface side and is made of a nonwoven fabric layer having moisture permeability. The exterior sheet 22 in the present embodiment includes a nonwoven skin-side exterior sheet 22a and a nonwoven non-skin-surface exterior sheet 22b, and is formed by joining these two layers of nonwoven sheets. A plurality of central elastic members 51 are arranged extending in the longitudinal direction of the disposable diaper 10 between the skin-side exterior sheet 22a and the non-skin-side exterior sheet 22b, and both sheets are joined only at that position, It becomes the exterior sheet 22. In the present embodiment, the moisture permeable sheet 21 and the exterior sheet 22 are joined at the positions of the plurality of central elastic members 51. By having the central elastic member 51 on the non-skin contact surface side of the moisture-permeable sheet 21 that is liquid-impermeable, body fluid after excretion does not directly contact the adhesive that joins the central elastic member. The arrangement is such that there is no peeling of the adhesive due to. In addition, the top sheet 1, the absorber 3, and the back sheet 2 in this embodiment are substantially hourglass shapes in plan view (see FIG. 2), and the top sheet 1, the moisture permeable sheet 21, and the exterior sheet 22 have the same shape. is there. In addition, the adhesive which joins said exterior sheet | seat, an elastic member, and an exterior sheet | seat and a moisture-permeable sheet can use the normal thing used for adhesion | attachment of this kind of member, for example, rubber-type hot melt, olefin type Hot melts, such as hot melt, are mentioned.

  As shown in FIG. 2, in the disposable diaper 10, side sheets 8 extending in the longitudinal direction along both side portions in the width direction of the absorbent body 3 are formed on the upper surface (skin contact surface side) of the top sheet 1. . The side sheet 8 is made of a non-woven fabric provided with a thread-like or thin string-like side sheet elastic member 52 that forms a pair of erecting leak-proof cuffs arranged on the free end side thereof. Each side sheet 8 has a top sheet 1 and an entire length in the diaper longitudinal direction (Y direction) from the position of the side edge 3s of the absorbent body 3 (see FIG. 3) to the side edge of the diaper in the region of the crotch side flap Sc. It is bonded and fixed together with the back sheet 2. The inner part of the side edge 3s of the absorber that forms the above-mentioned standing leak-proof cuff is not fixed to the top sheet 1, and the free end 8a side of the leak-proof cuff is a leg in the wearing state of the diaper. The elastic member 53 is configured to stand up three-dimensionally along the diaper longitudinal direction by the gathering action of the elastic member 53 (see the one-dot chain line in FIG. 3). The standing leak-proof cuff 81 serving as a three-dimensional gather is firmly in contact with the skin, effectively blocking the excretion from moving to the outside and effectively preventing side leakage.

In the moisture permeable gather area W of the disposable diaper 10 in the present embodiment, a plurality of central elastic members 51 are arranged. In the present embodiment, the moisture permeable gather region W is a region surrounded by W _{1 in the} longitudinal direction of the diaper and W ₂ in the width direction, and will be described in detail later. In the present embodiment, the skin surface side exterior sheet 22a and the non-skin surface side exterior sheet 22b are joined along the position of the central elastic member 51 disposed in this region (first adhesion regions 61, 62). Sheet 22 is obtained. Further, the exterior sheet 22 and the moisture permeable sheet 21 are joined along the position of the central elastic member 51 (second adhesion region 63). As described above, in order to join members used in disposable diapers and the like, when the entire surface is joined by a method such as an adhesive or thermocompression bonding, a part where the adhesive is applied or a part joined by pressure bonding in the joint part The moisture permeability is impaired. On the other hand, according to the disposable diaper 10 in this embodiment, the said exterior sheet 22 and the moisture-permeable sheet 21 are joined only in the position of the center elastic member 51, and also the skin surface side exterior sheet 22a and the non-skin surface side Also in the exterior sheet 22 b, the part to be joined is joined at the position of the central elastic member 51. Thus, the portion where moisture permeability is lost is a narrow region along the central elastic member 51 of the first adhesive regions 61 and 62 and the second adhesive region 63. The linear moisture-permeable region 64 extending in the longitudinal direction of the diaper between adjacent elastic members has good moisture permeability, and from the body surface side to the clothing side in the moisture-permeable gather region W that tends to be wet. It is possible for the moisture to be transferred, and even an adult diaper is not excessively stuffy.

  Here, the action peculiar to the disposable diaper 10 of the present embodiment will be described in more detail with reference to FIG. FIG. 4 is a schematic cross-sectional view showing a cross section at the position of the midline of the body while wearing the disposable diaper of the present invention. The median line is a line that divides symmetrically when the body is viewed from the front in the walking direction. The cross-sectional shape of the body shows the modeled outer shape part and the coccyx 75 to explain the position of the body. Moreover, about the shape at the time of mounting | wearing of the disposable diaper 10, it does not necessarily need to become the same shape as what was illustrated in implementation of this invention. In the figure, the left side is the front side of the body, and the right side is the rear side of the body.

In the present embodiment, the plurality of central elastic members 51 interposed between the skin surface side exterior sheet 22 a and the non-skin surface side exterior sheet 22 b are disposed extending in the longitudinal direction of the disposable diaper 10. On the other hand, in the width direction, a plurality of elastic members are arranged across both sides of the diaper midline Wc. The central elastic member 51 disposed and joined in the stretched state has an action of contracting with respect to the longitudinal direction of the disposable diaper 10 when worn. Thereby, it can wear | wear with the state curved along the skin surface of the human body 70, and draws the whole diaper toward the skin surface side of the human body 70, and implement | achieves favorable fitting property. What is important here is that the central elastic member 51 of the present embodiment is disposed on the outer peripheral side of the disposable diaper 10 so as to be inserted into the exterior sheet 22 and pressed together with a member on the absorber 3 side. It is that you are. As a result, as shown in FIG. 4, wave-shaped raised portions 82 and 82 continuous in the longitudinal direction of the diaper are formed while the diaper is brought into close contact with the human body 70 as a whole. At the same time, a plurality of gap portions 81 extending in the width direction of the irregular shape are formed between the raised portions 82 and 82.
In the present embodiment, the skin surface of the human body 70 and the moisture permeable gathering region W of the disposable diaper 10 are likely to come into contact with the skin surface only at the raised portion 82, and are easily separated from the skin surface of the human body 70 at the gap portion 81. As described above, a plurality of gaps are formed between the skin surface of the human body 70 and the disposable diaper 10, and the portion in contact with the skin surface is not a surface but an intermittent linear shape. In the present embodiment, the gaps 81, 81 interact with the above-described good moisture permeability toward the back sheet, that is, the skin surface of the human body 70 functions as a moisture path in the width direction of the disposable diaper 10. The moisture on the side is dispersed in the width direction, and is further released to the outside of the diaper (moisture transfer v (see FIG. 3)), effectively reducing the moisture on the skin side.

  In the diaper 10 of the present embodiment (see FIG. 4), as shown in the figure, the crotch C including the stool point 73 from the urination point 72 (the figure shows a woman as an example), and further through this, the tailbone Good fit is obtained at the portion where the region 74 tends to float. In addition, a plurality of small gaps 82 are appropriately formed to provide a moderate moisture permeability and to wear comfortably.

  Furthermore, it has the effect which prevents the bodily fluid after excretion from spreading | diffusion in a diaper longitudinal direction by the raised part 82 and the clearance gap part 81 which were continuously formed unevenly by the gather formation effect in this embodiment in the diaper longitudinal direction. The excreted body fluid moves downward by gravity from the vicinity of the excretion portion. In the diaper of this embodiment, the uneven shape is continuously formed in a direction orthogonal to the liquid transfer direction, and the absorber contact surface area in the body fluid transfer direction can be increased. Therefore, the absorber 3 can be effectively used, and the unpleasant area is expanded due to the diffusion of the body fluid. Moreover, moderate cushioning property is provided by the raised portion 82 and the gap portion 81 formed in the above-described unevenness, and a good wearing feeling is exhibited at the time of sitting or the like.

  In the present embodiment, the moisture permeable gathering region W is substantially the same region as the region where the central elastic member 51 is disposed. The moisture permeable gathering region W is a region where the central elastic member 51 is disposed in order to give the above-mentioned fit and moisture permeability to the diaper. However, in the present invention, at least the central elastic member in the crotch part C (the region in the longitudinal direction connecting the urination point 72 and the defecation point 73) sandwiched between at least the longitudinal central backside baseline Wr and the longitudinal central abdominal baseline Wf. 51 should just be arranged. The preferable range will be described later. In the width direction, in the present embodiment, the moisture-permeable gather region W is the same as the maximum width position 3w of the absorber 3. However, in the present invention, at least in the central region Wi-Wi (the central region of 1/4 to 3/4 of the region obtained by dividing the maximum width (3w-3w) of the absorber 3 into four in the width direction). The central elastic member 51 should just be distribute | arranged in the area | region pinched | interposed.

It is preferable that the position in the longitudinal direction of the moisture permeable gather region W is set to a position that is biased toward the ventral side F in the longitudinal direction of the disposable diaper 10. This is because when the disposable diaper 10 is worn, the central elastic member 51 is arranged at the longitudinal end of the dorsal side R so that it does not shrink and the rise is not made too shallow. This is to achieve good fit. It is also preferable in terms of improving the fit that the tension of the central elastic member 51 is set low in the outer regions l ₁ and r ₁ in the width direction and increased in the central regions l ₂ and r ₂ . Thereby, it becomes easy to move the foot by suppressing the tension around the foot, and the absorber 3 can be fitted to the body especially along the rupture at the central portion in the width direction. The outer regions l ₁ and r ₁ and the central regions l ₂ and r ₂ will be described later.

The size and position of the moisture permeable gathering region W are not particularly limited, but the moisture permeable gathering region W is a diaper when the above-described good moisture permeability is effectively exhibited as the adult disposable diaper 10 and a suitable fit is taken into consideration. The length w ₁ in the longitudinal direction is preferably 300 to 800 mm, more preferably 500 to 700 mm. The length _{w 2} is 100~400mm preferably in the width direction of the moisture-permeable gather region W, more preferably 150 to 350 mm. Further, the length in the longitudinal direction of the ventral side F is preferably 50 to 350 mm, and more preferably 150 to 300 mm. The length of the crotch part C in the longitudinal direction is preferably 50 to 350 mm, and more preferably 150 to 300 mm. The length in the longitudinal direction of the back side portion R is preferably 50 to 350 mm, and more preferably 150 to 300 mm. Further, the ratio in the longitudinal direction (abdominal side F: crotch C: back side R) is preferably 1: 1: 1, and 1: 1.5: 0. More preferably, it is 5. The length r ₁ from the longitudinal back side edge where the moisture permeable gathering region W is not disposed is preferably 100 to 350 mm, and more preferably 150 to 300 mm.

Although the separation distance, tension, thickness, and the like of the central elastic member 51 disposed in the moisture permeable gathering region W in the present embodiment are not particularly limited, the maximum of the central elastic member 51 is considered in consideration of the preferable fit described above. The thickness f ₁ (see FIG. 3) is preferably 0.2 to 10 mm, and more preferably 0.5 to 3 mm. The separation distance f ₂ in the width direction of the central elastic member 51 may be changed in each of the regions l ₁ , l ₂ , r ₁ , r _{2 obtained} by dividing the moisture permeable gather region W into four in the width direction. The separation distance f ₂ in the width direction of the central elastic member 51 in the outer regions l ₁ and r ₁ is preferably 20 mm, and more preferably 30 mm. Preferably the distance _{f 2} is 15mm in the width direction of the central elastic member 51 in the central region _{l 2, r} 2, more preferably from 10 mm. The region _l 1 was divided into four moisture-permeable gather region W at the width _direction, l _2, r 1, in _{r 2,} a width direction central area _(l 2, _{r 2} and the combined area) the width outward The fit property can be adjusted by making the elastic stretch characteristic different from the region (region combining l ₁ and r ₁ ). For example, assuming that the maximum elongation rate of the width direction outer regions r ₁ and l ₁ of the moisture permeable gather region is ₁ , the maximum elongation rate of the moisture permeable gather region width direction central region r ₂ and l ₂ is 1.2 or more. It is preferably 0 or less. This is particularly effective when the moisture-permeable gather region W is provided wide in the width direction in the crotch portion C, for example, when it is provided over a region of 70% or more of the entire width.
Here, the maximum elongation rate is an elongation rate when stretched to a length that cannot be further stretched (length immediately before material breakage), and the maximum elongation rate is obtained by the following formula (1).
Maximum elongation rate (%) = {(length after stretching−length before stretching) / length before stretching)} × 100% (1)
The measurement was performed as follows. For each of the central region in the width direction and the outer region in the width direction, the entire region where the central elastic member 51 is arranged in the longitudinal direction is cut out, and a sample in which only the central elastic member 51 and the back sheet 5 are joined is prepared as a sample. To do. Marks at intervals of 100 mm in the longitudinal direction in the natural state (contracted state) of the sample are used as the length before extension. Next, this sample is stretched in the longitudinal direction, and the interval between the marks is measured to obtain the length after stretching. The measurement result is inserted into the above formula (1) to calculate the maximum elongation rate.
As a method for varying the elongation rate, it includes varying the distance f ₂ in the width direction of the central elastic member 51 between the widthwise central area and the width outward region. In this case, the distance f ₂ in the width direction of the central elastic member 51 in the outer regions l ₁ and r ₁ is preferably 20 mm, and more preferably 30 mm. Preferably the distance _{f 2} is 15mm in the width direction of the central elastic member 51 in the central region _{l 2, r} 2, more preferably from 10 mm. Further, the arrangement of the elastic members may be adjusted according to the elongation rate of each elastic member.

In the present invention, the area ratio between the moisture permeable region 63 and the adhesion regions 61 and 62 formed in the moisture permeable gather region W is not particularly limited, but the following relationship is preferable. In the diaper plan view (see FIG. 2), a region where the absorber and the moisture permeable gather region W overlap is defined as an absorber permeable region Wk. At this time, in the region Wk, the first adhesion regions 61 (62), 61 (62),... Where the skin surface side exterior sheet 22a and the non-skin surface side exterior sheet 22b are joined via the elastic member. . . And the second adhesive regions 63, 63. Where the moisture permeable sheet 21 and the exterior sheet 22 are joined. . . And the areas d ₁ , d ₂ , d ₃ ,. . . . and d _n. The sum is Σd _n. At this time, when the first adhesive regions 61 and 62 and the second adhesive region 63 are overlapped in a plan view, an area of a wide region in the width direction in the plan view is selected and the sum is obtained. On the other hand, in the absorbent body moisture permeable region Wk, moisture permeable regions 64, 64. . . Are defined as e ₁ , e ₂ , e ₃ ,. . . . When e _n, the sum becomes Sigma] e _n. In view of the good moisture permeability as described above, the sum of the moisture permeable region 64 of the absorbent body moisture-permeable regions Wk the (Sigma] e _n), the width direction of the sum of the first adhesive regions 61, 62 and the second adhesive region 63 ([Sigma] d _n ) It is preferable to make it wider (Σe _n > Σd _n ). Further, the ratio (Σe _n / Σd _n ) of both is preferably more than 1 and 150 or less, and more preferably 3 to 60. Furthermore the ratio of the sum Sigma] e _n of the moisture permeation area for the absorbent body moisture-permeable regions Wk (Σe _n / Wk) is preferably from 1 to 10.

The method of interposing and joining the central elastic member 51 in the present embodiment between the skin surface side exterior sheet 22a and the non-skin surface side exterior sheet 22b is not particularly limited, but an adhesive such as hot melt is previously applied to the central elastic member 51. It may be applied and disposed on the skin-side exterior sheet 22a or the non-skin-side exterior sheet 22b, and the central elastic member 51 is disposed in advance on the skin-side exterior sheet 22a and the non-skin-side exterior sheet 22b. The adhesive may be applied linearly or in the form of dots and the central elastic member 51 may be disposed, and then bonded. At this time, the central elastic method in member 51 keep the adhesive is applied is, the width f ₁ of the resilient member the width of the first adhesive regions 61 and 62 are matched as shown in FIG. 3 (b), the moisture-permeable region preferable in terms of ensuring a wide 64 width _{f 2} of.

  In consideration of convenience when using the disposable diaper of the present embodiment, it is also preferable that the central elastic member 51 has a marking function. For example, the central line in the width direction of the diaper can be shown by incorporating the central elastic member 51a having a different color into the central portion (midline) Wc that bisects the diaper in the width direction. In particular, in the case of a disposable diaper for adults, it is often worn by a bedridden assistant or the like, and it is necessary for the assistant to check the center line of the diaper. By confirming the correct state of wearing the diaper, it is possible to prevent inconvenience such as leakage and to effectively utilize the above-described good effects in the present invention. It is also preferable to provide the moisture permeable sheet 21 with a deodorizing function. As for this, the disposable diaper 10 in this embodiment has the moisture permeability to a favorable diaper thickness direction, and has implement | achieved high comfort for a wearer. On the other hand, the high moisture permeability causes anxiety such as urine odor to the outside, but the odor is suppressed by giving the moisture permeable sheet 21 a deodorizing function, and the anxiety is eliminated.

  The absorbent article of the present invention is not limited to the above embodiment, and the present invention can be applied to diaper covers, sanitary napkins, incontinence pads, incontinence liners, and the like. Furthermore, it is effective not only for urine but also for menstrual blood, vaginal discharge, loose stool, and the like. The arrangement pattern of the central elastic member 51 is not limited to a straight line shape, but is not limited to the above-described embodiment such as a curved line shape or a zigzag shape. In addition to the top sheet 1, the absorbent body 3, and the back sheet 2, it is also preferable to appropriately incorporate a material that does not inhibit moisture permeability. Moreover, the material of the top sheet 1, the absorber 3, and the back sheet 2 of the disposable diaper of the said embodiment, the conditions in a manufacturing method, and the dimensional introduction of a product are not specifically limited.

Next, a preferred embodiment of a wearing cover such as a diaper cover which is another embodiment of the present invention will be described. The basic structure can refer to the adult diaper, and the relationship between the moisture-permeable sheet and the exterior sheet and the absorbent body is the same as that of the diaper. More specifically, the wearing cover of the present embodiment includes an abdominal side portion, a back side portion, and a crotch portion positioned between the two portions, and a moisture permeable sheet disposed on the skin surface side and its non-skin surface side A plurality of layers of elastic members are arranged extending in the longitudinal direction of the absorbent article between the nonwoven fabric layers, and both the nonwoven fabric layers are On the other hand, a joint portion extending in the longitudinal direction of the absorbent article for joining the exterior sheet and the moisture permeable sheet is arranged between the position where the elastic member is located and / or between the elastic member and the moisture permeable sheet. There is a moisture permeable region extending in the longitudinal direction showing moisture permeability connected from the absorber to the outside of the absorbent article via the sheet and the exterior sheet. This wearing cover can be mounted by placing an absorbent pad having an absorber inside on the inside. At this time, the region in which the plurality of elastic members are disposed covers the entire area in the width direction of the absorbent body of the absorbent pad, and the elastic member is disposed in the elastic member disposed region and the superposed region Wk of the absorbent body. total area of the moisture permeable sheet and the and the outer sheet are not joined moisture-permeable region without (Sigma] e _n) is, the area between the package sheets are bonded via the elastic member and the moisture permeation It is preferable that the total area (Σd _n ) of the region where the sheet and the exterior sheet are joined is wider. Such a relationship between the moisture permeable sheet, the exterior sheet, and the elastic member constituting the wearing cover, and the absorbent body of the absorbent pad is common to the diaper of the above-described embodiment. For example, FIG. 2 can be referred to.

  For the central elastic member 51, the side sheet elastic member 52, and the leg elastic member 53, ordinary elastic materials used for absorbent articles can be used. Examples of the material include styrene-butadiene, butadiene, isoprene, neoprene, and the like. Synthetic rubber, natural rubber, EVA, stretchable polyolefin, polyurethane, etc., and the form is a thread-like or string-like shape (flat rubber, etc.) having a rectangular, square, circular, or polygonal cross section, or A multifilament type filament or the like can be used.

  The top sheet 1 is preferably a hydrophilic thermal bond nonwoven fabric from the viewpoint of promptly absorbing the excreted body fluid and transmitting it to the absorbent body and from the viewpoint of good touch, and particularly preferably an air-through nonwoven fabric. The top sheet 1 is preferably a thermoplastic resin fiber that has been subjected to a hydrophilic treatment, and the fiber is a fiber that has undergone a three-dimensional crimp such as a secondary crimp or a tertiary crimp. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, and various hydrophilizing agents are applied at a stage before cutting into a predetermined length to form staples. Hydrophilic agents include various alkyl sulfonates represented by α-olefin sulfonates, acrylates, acrylate / acrylamide copolymers, ester amides, ester amide salts, polyethylene glycol and derivatives thereof, water-soluble Hydrophilic treatment with a hydrophilizing agent known to those skilled in the art, such as a reactive polyester resin, various silicone derivatives, various sugar derivatives, and mixtures thereof, can be used.

The moisture-permeable sheet 21 can be a moisture-permeable film alone, a laminate of a film and a nonwoven fabric, or a water-repellent nonwoven fabric (such as SMS or SMMS). From the viewpoint of cost and the like, it is most preferable to use a moisture permeable film alone as a leakproof material. As a film material in this case, a film obtained by melt-kneading a thermoplastic resin and an inorganic filler that is not compatible with the thermoplastic resin is stretched to a predetermined size to form fine pores (pore diameter: 0.1 μm to 5.0 μm). An open film, or a non-porous film having a high water compatibility and capable of discharging water vapor like an osmotic membrane can be used. In order to realize a leak-proof layer that sufficiently exhibits the performance of moisture discharge related to the present invention and does not ooze out moisture, the moisture permeability should be in the range of 0.7 to 3.0 g / 100 cm ² hr. Is preferable, and it is still more preferable that it exists in the range of 1.0-2.5. From the standpoint of sufficiently improving the smoothness, it is most preferably from 1.5 to 2.5. Moreover, in order to be able to use without trouble, such as a tear of a film, a film basic weight is 18-70 g / m < ² >, More preferably, it is 25-60 g / m < ² >. Moreover, a preferable inorganic filler compounding quantity is 30-65 mass% as a mass% of the filler with respect to the mass of the whole film, More preferably, it is 40-60 mass%.

  As the exterior sheet 22, one produced by each method of spun lace, needle punch, melt blown, thermal bond, spun pond, chemical bond, and air through can be used. As the constituent fibers of the nonwoven fabric, polyolefin-based, polyester-based, polyamide-based fibers, core-sheath type composite fibers or parallel type composite fibers made of polyethylene / polypropylene or polyester can be laminated and used.

  The absorber 3 is a mixture of fluff pulp and superabsorbent polymer particles, or a mixture of fluff pulp, superabsorbent polymer particles and thermoplastic synthetic resin fibers, and is compressed to a required thickness. The core 20 is preferably covered entirely with a liquid-permeable sheet such as tissue paper or a hydrophilic fiber nonwoven fabric in order to prevent the shape of the core 20 from dropping and the polymer particles from falling off. As the polymer particles, starch-based, cellulose-based or synthetic polymer-based particles can be used.

DESCRIPTION OF SYMBOLS 1 Top sheet 2 Back sheet 21 Moisture permeable sheet 22 Exterior sheet 3 Absorber 4 Fastening tape 8 Side sheet 10 Disposable diaper 51 Central elastic member 52 Side sheet elastic member 53 Leg elastic members 61, 62, 63 Adhesion area 64 Moisture permeability area 70 Human body 81 Crevice part 82 Raised part

Claims (6)

A top sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and both of the stomach side portion, the back side portion, and the crotch portion positioned between the both portions Absorption having a longitudinal direction seen from the abdominal side part to the back side part through the crotch part and a width direction orthogonal to this, comprising an absorbent body interposed between the sheets and arranged from the abdominal side part to the back side part A sex product,
The back sheet has an outer sheet provided with a moisture permeable sheet on the absorber side and two or more nonwoven layers covering the non-skin contact surface side, and a plurality of elastic layers are provided between the two nonwoven layers. The members are arranged extending in the longitudinal direction of the absorbent article, and both the nonwoven fabric layers are joined via the elastic member. On the other hand, the outer sheet and the moisture-permeable sheet are disposed at a position where the elastic member is present. The joining parts extending in the longitudinal direction of the absorbent article to be joined are arranged, and in the region where the moisture permeable sheet and the exterior sheet are not joined without the elastic member, the moisture permeable sheet and the exterior sheet are interposed via the moisture permeable sheet and the exterior sheet. An absorbent article having a moisture permeable region extending in a longitudinal direction and exhibiting moisture permeability leading from the absorbent body to the outside of the absorbent article.   The moisture permeable gather region in which the plurality of elastic members are arranged is divided into four in the width direction, and in the two width direction center regions existing in the center and in the two width direction outer regions existing on the left and right outer sides, the elasticity The absorbent article according to claim 1, wherein the maximum elongation rate of the member is set higher on the inner side than on the outer side in the width direction of the absorbent article.   The absorbent article according to any one of claims 1 and 2, wherein the plurality of elastic members are disposed at least in the center in the width direction of the crotch part of the absorbent article. The region in which the plurality of elastic members are disposed extends over the entire region in which the absorbent body is disposed in the width direction of the absorbent article, and the elastic member is disposed in the elastic member disposed region and the polymerization region Wk of the absorbent body. total area of the moisture-permeable region without the moisture permeable sheet and said outer sheet are not joined (Sigma] e _n) is, the area between the package sheets are bonded via the elastic member and the moisture permeation The absorbent article according to any one of claims 1 to 3, wherein the absorbent article is made wider than a total sum (Σd _n ) of a region where the sheet and the exterior sheet are joined. The exterior which consists of a moisture permeable sheet arranged on the skin surface side and two or more non-woven fabric layers covering the non-skin surface side, comprising an abdominal side portion, a back side portion, and a crotch portion located between the two portions A wearing cover having a sheet and having a longitudinal direction viewed from the abdominal side part to the back side part through the crotch part and a width direction perpendicular thereto,
Between the two nonwoven fabric layers, a plurality of elastic members are arranged extending in the longitudinal direction of the absorbent article, and both the nonwoven fabric layers are joined via the elastic members, while the elastic members are In a certain position, a joining portion extending in the longitudinal direction of the absorbent article that joins the exterior sheet and the moisture-permeable sheet is arranged, and in a region where the moisture-permeable sheet and the exterior sheet are not joined without the elastic member. A wearing cover having a moisture permeable region extending in a longitudinal direction showing moisture permeability connected to the outside of the absorbent article from the absorbent body via the moisture permeable sheet and the exterior sheet. When the absorbent pad having the absorbent body is disposed inside and attached to the inner side of the wearing cover, the region in which the plurality of elastic members are disposed is the entire region in the width direction of the absorbent body of the absorbent pad. in over, in the polymerization region Wk of the elastic member providing areas and the absorber, the total area of the moisture-permeable region where the elastic member and the moisture permeable sheet without said outer sheet is not bonded (Sigma] e _n) is The area between the exterior sheets is joined via the elastic member, and the sum of the areas where the moisture-permeable sheet and the exterior sheet are joined (Σd _n ). The described wearing cover.

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