KR20140031914A - Absorbent article - Google Patents

Abstract

[Solution]
An absorbent article having a liquid permeable surface sheet disposed on the skin-contacting surface side, a back sheet disposed on the non-skin-contacting surface side, and an absorber interposed therebetween, wherein the surface sheet is made of a nonwoven fabric, and the absorber is It has an absorbent core and the coating sheet which coat | covers this, The back surface contact surface side of the said surface sheet has several back recessed parts recessed adjacent to the skin contact surface side, and is arrange | positioned adjacently, The said back cover recessed part An absorbent article having a space portion between the uncovered coated sheet and the absorbent core.

Description

[0001] ABSORBENT ARTICLE [0002]

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

In absorbent articles, such as a disposable diaper, the material and the structure of each member were improved, and the function and the wearing feeling were improved. For example, the surface sheet and the absorbent body as members are also developed for such improvement, and in recent years, various proposals have been made to increase the functionality according to the use situation and the type of article. Further, in order to obtain a good wearing feeling, studies have been made to increase the thickness of the external member by maintaining the distance between the skin contact portion of the diaper and the absorbent body. Thereby, liquid return to the article skin contact surface side and humidity rise in a diaper can be suppressed. Specifically, a sublayer is laminated under the surface sheet, the surface sheet is embossed with embossing, or the like, and the sheet is bonded and fixed with other nonwoven fabric sheets by compression or the like. .

Patent Literature 1 discloses an absorbent article in which the absorber itself is in close contact with the surface sheet to form an uneven shape. As a result, the internal transferability of the liquid is increased, and soft feel can be realized. Patent Literature 2 discloses that the absorbent body has a large number of recesses extending from the skin contacting surface side to the inside in the excrement facing area of the sanitary napkin. In this napkin, the surface area of the skin-contacting surface side of the absorber becomes large, and the liquid is captured in the recess and drawn into the inside. Therefore, it is considered that the diffusion of the liquid is suppressed on the skin surface side and the spot absorption is excellent. This is due to the study of the shape of the absorber itself.

Patent Document 3 discloses that a trunk circumference gathered of a composite elastic part is formed in the abdomen and back of the diaper in order to increase the fit, breathability and softness of the diaper's torso. have. In this composite expansion and contraction portion, the plurality of elastic members interposed between the two layers of the body circumference portion become non-fixed at positions other than the widthwise end portions, and elasticity is not impaired. By contraction of the elastic member, the two layers of sheets protrude in opposite directions, respectively, to form a plurality of longitudinal walls. This achieves breathability and softness.

Patent Literature 4 discloses a diaper in which a pair of waist flaps extending outward in the width direction are disposed in a back side region serving as a body circumference, and a body circumferentially stretched region is formed inside the waist flap portion. Thereby, it is considered that the stretched area is extended to compensate for the difference in insistence between the circumference of the trunk and the buttocks and the fit is improved.

Patent Document 5 discloses a surface sheet having an uneven structure composed of two layers. The surface sheet has a plurality of convex portions, a central region in which the concave portions are formed, and side regions on both sides of the central region. The two layers are firmly fixed when the recessed portion of the upper layer sheet in the center region is heated and pressurized by the lower layer sheet and the heat roll. Thereby, the said surface sheet is stably hold | maintained with the high convex part in a center area | region, and has high liquid return prevention property. And it is thought that high antispill property can be acquired by the side area | region which was excellent in the migration of the liquid to an absorber.

Moreover, the patent document 6 discloses the surface sheet which consists of two layers which have an uneven | corrugated shape formed from the pin roll. It is thought that the liquid flow in the skin contacting surface side is reduced by the coating liquid recessed part formed in the skin contacting surface side of the said surface sheet, and it is considered that it is excellent in breathability and cushioning property.

Japanese Unexamined Patent Publication No. 2009-119022 Japanese Unexamined Patent Publication No. 2008-18048 Japanese Unexamined Patent Publication No. 2008-132023 International Publication No. 2009/104581 Japanese Unexamined Patent Publication No. 2009-118920 Japanese Unexamined Patent Publication No. 2009-89965

The absorbent article of the present invention is characterized in that the surface sheet having the back recesses is combined to interact with other members.

The present invention is an absorbent article having a liquid permeable surface sheet disposed on the skin-contacting surface side, a back sheet disposed on the non-skin-contacting surface side, and an absorber interposed between the two sheets, wherein the surface sheet is made of a nonwoven fabric. And the absorbent body has an absorbent core and a covering sheet covering the same, and on the non-skin-contacting surface side of the surface sheet, a plurality of back recesses recessed toward the skin-contacting surface side are provided, and the absorbent article is disposed to be adjacently dispersed. The covering sheet is indented into the back recessed portion, and a space portion exists between the indented covering sheet and the absorbent core. Moreover, the convex integral deformation | transformation part which the said front sheet and said back sheet forms is arrange | positioned, without interposing the absorber in the longitudinal direction outer side of the said absorber. In addition, a sublayer is disposed between the surface sheet and the absorber, and the sublayer and a rear convex portion of the surface sheet adjacent to the rear concave portion abut each other, where the fiber density of the sublayer is different. It is higher.

The above, the other characteristics, and the advantage of this invention will become clear from the following description with reference to attached drawing suitably.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partially cutaway perspective view which shows typically the disposable diaper as one preferable embodiment of the absorbent article in this invention in the skin contact surface direction.
(A) is a sectional drawing of the II-II cross section shown in FIG. 1, (2) is the partial enlarged sectional drawing which partially shows the cross section of a surface sheet, and (3) is a surface sheet and a covering sheet. It is a partially expanded sectional view which shows the arrangement relationship of to.
FIG. 2: B is a photographic drawing substitute photograph which picked up the cross section of the disposable diaper of this embodiment. FIG.
FIG. 3: is explanatory drawing which shows typically the relationship of the surface sheet, a coating sheet, and an absorbent core in a back surface recessed part. FIG.
It is a perspective view which shows typically the surface sheet used for the diaper of embodiment by a partial cross section.
FIG. 5 is a partially enlarged cross-sectional view showing an enlarged portion of a predetermined cross section of FIG. 2-1 (a).
FIG. 6: is explanatory drawing which shows typically the relationship of the back surface recessed part and the back surface convex part in the non-skin-contacting surface side of a surface sheet in plan view.
FIG. 7 is a photograph substituted for drawing a cross section of the surface sheet of the present embodiment. FIG.
FIG. 8: is explanatory drawing which shows the modification of the cross-sectional shape of a back surface recessed part.
It is explanatory drawing which shows the modification of the cross-sectional shape of a surface sheet.
10 is an explanatory diagram showing a modification of the absorbent core.
FIG. 11: is explanatory drawing which shows typically the diffusion state of the liquid in Example 1 and 2 and Comparative Examples 1 and 2. FIG.
FIG. 12: is explanatory drawing which shows typically the diffusion state of the liquid in Example 1 and 2 and Comparative Examples 1 and 2. FIG.
It is a partially cutaway perspective view which shows typically the disposable diaper as another preferable embodiment (2nd embodiment) of the absorbent article in this invention from the skin contact surface direction.
FIG. 14 is a partially enlarged notch perspective view schematically showing the end laminated portion of the disposable diaper of the second embodiment in an enlarged manner. FIG.
15: (A) is sectional drawing of the AA cross section of FIG. 14, (B) is sectional drawing of the BB line cross section of FIG.
FIG. 16 is a partially enlarged cross-sectional view schematically illustrating a partially enlarged cross section of an end laminated portion in FIG. 15. FIG.
FIG. 17: is explanatory drawing which shows typically the top part, the deflection point, and the deflection direction of the interface of the integrally deformed part in FIG.
FIG. 18A is a diagram corresponding to FIGS. 15 and 17, illustrating a modification of the end laminate part of the second embodiment. FIG.
FIG. 18B is a diagram corresponding to FIGS. 15 and 17, illustrating another modified example of the end laminate part of the second embodiment. FIG.
FIG. 18C is an equivalent view to FIGS. 15 and 17, illustrating another modified example of the end laminate part of the second embodiment. FIG.
FIG. 19: is a top view which shows typically the other preferable example of the planar arrangement of the integral deformation part in the edge part laminated part of 2nd Embodiment.
It is explanatory drawing which shows the state of expansion | extension and expansion | stretching of the edge part laminated part of 2nd Embodiment.
FIG. 21 is a partially enlarged cross-sectional view schematically illustrating a cross section of an end laminate part using the surface sheet of FIG. 4. FIG.
FIG. 22 is a partially enlarged cross-sectional view showing a state where a nonwoven fabric sheet is interposed between a front sheet and a back sheet in an end laminate part of the second embodiment. FIG.
It is explanatory drawing which shows typically the cross-sectional shape of the edge part laminated part of the test body of each of Example 21 and Comparative Examples 21-23.
FIG. 24 is a drawing substitute photograph showing a state after dropping and inclination of each of the test bodies of Examples 21 and Comparative Examples 21 to 23. FIG.
It is a partially cutaway perspective view which shows typically the disposable diaper as another preferable embodiment (third embodiment) of the absorbent article in this invention from the skin contact surface direction.
FIG. 26A (1) is a cross sectional view taken along the line II-II shown in FIG. 25, and (2) is a partially enlarged cross sectional view schematically showing the arrangement relationship between the surface sheet and the sublayer.
It is a drawing substitution photograph which picked up the cross section of the disposable diaper of 3rd Embodiment.
It is explanatory drawing which shows typically the relationship of the surface sheet, a sublayer, and an absorber in a back surface convex part.
FIG. 28 is a partially enlarged cross-sectional view showing an enlarged portion of a predetermined cross section of FIG. 26A.
It is explanatory drawing which shows the modification of the cross-sectional shape of a surface sheet.
FIG. 30 is a photograph substituted for drawing photographing the state after the test execution of the surface sheet in Example 31. FIG.
FIG. 31: is a photographic drawing photograph which captured the state after the test implementation of the surface sheet in the comparative example 31. FIG.

The present invention further improves the absorption performance of a conventional absorbent article, and even if there is a repeated excretion liquid or a large amount of excretion liquid, the liquid is quickly drawn and diffused inside the absorber while suppressing the diffusion of the liquid from the surface sheet, thereby efficiently The present invention relates to the provision of an absorbent article to be absorbed and retained. Moreover, this invention relates to provision of the absorbent article which improved the anti-fogging property in the part which does not interpose an absorber. Further, the present invention may occur depending on the state of use, the amount of excretion, etc., in addition to the high liquid drawability and the liquid return prevention property obtained by the increase in thickness by the conventional member lamination. It is related with the provision of the absorbent article which can further reduce the residual liquid on the skin surface side, and can further reduce the burden on the skin of a wearer.

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates in detail with reference to drawings based on the preferable embodiment (1st-3rd embodiment).

In addition, when talking about the back surface recessed part 7 and the back surface convex part 8 in this invention in 1st Embodiment and 2nd Embodiment, it is especially from the arrangement formation position of 1st Embodiment. The thing of the absorber upper surface recessed part 7v and the absorber upper surface convex part 8v may be called, and the thing of 2nd Embodiment is called the end back surface recessed part 7w and the end surface convex part 8w. There is also. On the other hand, the back surface recessed part 7 and the back surface convex part 8 of 3rd Embodiment are the absorber upper back recessed part 7v and the absorber upper back convex part similarly to 1st Embodiment from the arrangement formation position. 8v). In addition, it may call only the back surface recessed part 7 and the back surface convex part 8, without distinguishing.

In addition, when distinguishing 1st Embodiment and 3rd Embodiment about the space part 72 in this invention, the thing of 1st Embodiment is especially called the absorber inside space part 72v from the member structure. In addition, the thing of 3rd Embodiment is also called recessed part space part 72w or the sublayer upper space part 72w. In addition, it may only be called the space part 72. FIG.

[First Embodiment]

1: is a partially cutaway perspective view which shows typically the disposable diaper as one preferable embodiment (1st embodiment) of the absorbent article in this invention from the skin contact surface direction. The diaper shown in this figure is a tape-type disposable diaper, and it is shown by the state which looked at the inner side (skin contact surface side) by slightly bending the diaper of the state expanded to the plane.

First, the outline | summary of the said disposable diaper 10 of 1st Embodiment is demonstrated.

The disposable diaper 10 of 1st Embodiment has the liquid-permeable surface sheet 1 arrange | positioned at the skin contacting surface side, the back sheet 2 arrange | positioned at the non-skin-contacting surface side, and interposed between these. It has an absorber (3). The absorber 3 has an absorbent core 31 and covering sheets 32 and 33. The skin abutting side and the non-skin abutting side of the absorbent core 31 have a flat shape. The skin-contacting surface side is covered with a covering sheet 32, and the non-skin-contacting surface side is covered with a covering sheet 33, and both the covering sheet and the absorbent core 31 are intermittently joined by spray coating or the like with a hot melt adhesive. have. Moreover, the width direction edge part of both the covering sheets is mutually joined at the both sides outer edge of an absorptive core.

The back sheet 2 is in a developed state, and has an approximately hourglass shape in which both edges thereof are constricted inward in the longitudinal direction (Y direction) center portion, thereby forming the appearance of the diaper. The appearance of the diaper 10 is a ventral part F disposed on the wearer's abdomen in the longitudinal direction (Y direction) as its expanded state, a back side part R disposed on the belly side, and a crotch part located therebetween ( C). The crotch part C includes an area (excretion part correspondence area) corresponding to the excretion part of the wearer. The back sheet 2 may consist of one sheet or may consist of a plurality of sheets. On the back sheet 2, the surface sheet 1 and the absorber 3 are arrange | positioned so that the upper surface of the absorber 3 may cover the surface sheet 1, and is formed. The surface sheet 1 and the absorbent body 3 are substantially rectangular shape narrower than the back sheet 2, respectively, and are arrange | positioned so that these longitudinal directions may match the longitudinal direction of the back sheet 2. Moreover, a pair of side sheets 4 and 4 are laminated | stacked toward the width direction (X direction) outward from the longitudinal direction both edges of the surface sheet 1. At the end of the side sheet 4 near the center in the width direction, a heat release cuff 41 in which an elastic member is disposed is formed, and a leg gather 42 in which an elastic member is disposed is formed in the width direction outward. These can effectively prevent lateral glands such as liquids in the hip joints caused by the movement of infants and the like. In the diaper 10 of this embodiment, you may form a functional structural part, a sheet | seat material, etc. further.

In the abdomen part F and the back part R of the diaper 10, the side sheet 4 and the back sheet 2 were laminated | stacked, and the back flap part 17 and the abdominal flap part 18 which extended outward in the width direction ) Is formed. A fastening tape 19 is formed in the back flap portion 17. This tape 19 is affixed on the tape sticking part (not shown) formed in the abdominal flap part 18, and a diaper can be fixed. At this time, the center of the diaper longitudinal direction is gently folded inward, and the absorber 3 is worn so that the absorbent body 3 follows from the buttocks to the lower abdomen of the infant. As a result, excretion is absorbed and retained in the absorbent body 3 accurately.

Although the details of the surface sheet 1, the back sheet 2, the material of the absorbent portion 3 and the like will be described later, in the present embodiment, the surface sheet 1 quickly absorbs the excreted body fluid, It is formed using a hydrophilic air through nonwoven fabric from the viewpoint of delivering and from the viewpoint of good touch. Moreover, as the back sheet 2, it consists of a liquid-impermeable member, for example, is formed using a moisture permeable film etc. which have air permeability and are permeable. The liquid impermeability of the present invention means a property that is difficult to permeate the liquid, and includes waterproofness, water repellency, and liquid impermeability. For the absorbent body 3, the absorbent core 31 is formed of a pulp fiber and a super absorbent polymer, and the cover sheets 32 and 33 are formed using a high hydrophilic material.

In the present invention, unless otherwise specified, the surface on the side in contact with the human body is called the skin side to the skin-contacting surface or the surface, and the surface on the opposite side is referred to as the non-skin-to-skin-contacting surface or the back surface. . In these two surfaces, the side close to the skin side to the extending direction are referred to as the skin surface side, the skin contacting surface side or the surface side, and the side close to the non-skin surface to the extension direction is the non-skinned surface side and the non-skin contacting surface side. Or it is called back side. The front end of the human body will be referred to as the front, the front end of the body, the rear end of the body, and the rear end of the body. The normal direction of the front or back surface of the absorbent article is called the thickness direction and the amount thereof is called the thickness. In addition, the direction from the abdominal part to the crotch part as viewed from the plane of the absorbent article is called a longitudinal direction or a longitudinal direction, and the direction orthogonal to this longitudinal (length) direction is called a width direction. In addition, the longitudinal direction typically coincides with the front-rear direction of the human body in a mounted state.

Next, the cross-sectional shape of the diaper 10 is demonstrated with reference to FIGS. 2-1 and 2-2. (A) is sectional drawing of the II-II line cross section shown in FIG. 1, (b) is the partial enlarged sectional drawing which partially shows the cross section of a surface sheet, (c) is a surface sheet, and It is a partially expanded sectional view which shows typically the arrangement relationship of a coating sheet. 2-2 is a drawing substitute photograph which image | photographed the cross section of the disposable diaper 10 of this embodiment, The whole cross section is shown with the photograph of the center, and the back surface recessed part 7 (the absorber body back surface recessed part) among them is shown. One of (7v)) is enlarged and shown to the right lower side. In the enlarged view of this backside recessed part 7, the space part 72 (the part 72v in an absorber body) located under the part (entrance part 71) in which the covering sheet was inclined was enclosed by the dashed circle. Shown as a part. In addition, the absorbent core 31 is a fiber aggregate which consists of pulp fibers etc., The outer surface has the fine ups and downs of which the outer edge fiber is fluffed. Therefore, in FIG. 2-1 (a), the outline of the outline of the absorbent core 31 was shown by the dashed-dotted line as a rough range of a fiber assembly (it is the same in FIGS. 3 and 5).

As shown to FIG. 2-1 (a), in the cross-sectional shape of the diaper 10, the surface sheet 1 and the coating sheet 32 have the uneven shape with respect to the absorbent core 31. As shown in FIG. By this shape, especially the structure by the back surface recessed part 7 and the member below, the improvement of the attractance of a liquid mentioned later, the improvement of the liquid diffusibility in the inside of an absorber, and the speed of liquid fixation are realized. The cross-sectional shape of this surface sheet 1 and the covering sheet 32 is further demonstrated with reference to FIGS. 2-1 (b) and (c).

As shown to FIG. 2-1 (b), the back surface recessed part recessed from the non-skin-contacting surface side z ₂ to the skin-contacting surface side z ₁ from the non-skin-contacting surface side of the surface sheet 1 ( 7) is formed. This back surface recessed part 7 is arrange | positioned periodically in the planar direction by adjoining substantially equal intervals, and by this arrangement, the non-skin-contacting surface side of the surface sheet 1 becomes an uneven | corrugated shape. In short, between the back of the concave portion is, when projected in the non-skin abutment face side (z ₂₎ from the skin abutment face side (z ₁₎ are the projections (8). Here, "the back surface recessed part is arrange | positioned and adjoined and distributed" means that the below-mentioned part 7a which becomes the bottom of the recessed part of the back surface recessed part 7 and the neighboring 7a are gradually arranged through the bottom part 7c. It forms, and is arrange | positioned so that each back surface recessed part 7 may spread in each direction by planar view. A plurality of root depressions are not arranged in parallel. In addition, in this embodiment, the surface convex part 78 is formed in the skin contacting surface side of the surface sheet 1 corresponding to this back surface recessed part 7, and the surface sheet corresponding to the back surface convex part 8 ( The surface recessed part 88 is formed in the skin contact surface side of 1).

As shown to FIG. 2-1 (c) and FIG. 2-2, the skin contact surface side of the absorber 3 is located in the back surface recessed part 7 (back surface recessed part 7v on an absorber body) of the surface sheet 1. The entry part 71 in which a part of the covering sheet 32 which covers the surface is raised and squeezed is formed. When the covering sheet 32 and the absorbent core 31 are intermittently bonded with a hot melt adhesive like the diaper 10 of this embodiment, the covering sheet 32 is raised between the adhesive, and the entrance part 71 It is preferable to become). 2-1 (c) and 2-2, between the covering sheet 32 and the absorbent core 31 in the back surface recessed part 7 (back surface recessed part 7v on an absorber body). The space portion 72 (the absorber space portion 72v) is formed. This space portion 72 is formed by the formation of the entry portion 71 due to the elevation of the covering sheet 32. The recessed depth h ₂ of the entry portions 71, 71,... Does not necessarily have to be uniform, and is not only deep as shown in FIG. 2-2, but also the depth of the depression of the back surface recess 7. (h _1)> or may be that a depth (h ₂₎ squeeze into the entry portion 71 (see Fig. 2-1 (C)). In such back surface recessed part 7, the clearance gap is formed also between the surface sheet 1 and the covering sheet 32, and the buffer clearance part 73 which mitigates the influence of the force from the surface sheet 1 side. It is preferable to become.

The back recessed part 7 is a recessed part of the non-skin-contacting side surface of the surface sheet 1, and the side wall part 7b which goes to the bottom part 7c from the government part 7a which the surface sheet 1 along the recessed part makes up ) (See Fig. 2-1 (b)). Such backside recess 7 is not necessarily defined as a complete geometric figure because it is made of a soft nonwoven fabric, but the cross-sectional shape of the backside recess 7 formed by the side wall portion 7b becomes a shape similar to a parabola. The space shape of the back surface recessed part 7 is a shape similar to the cone-shaped cone or the truncated cone to the top part 7a. In addition, the three-dimensional shape of the back surface recessed part 7 is not limited to the thing of this embodiment, Any shape of a recessed part can be employ | adopted, for example, may be a shape like a vertebral body or a main body. . If there is an uneven shape on the skin-contacting surface side of the surface sheet as in the present embodiment, it is shaped like a vertebral body (cone, cone, pyramid, pyramid, temple, etc.) in accordance with the shape of the skin-contacting surface side. desirable.

In the present embodiment, the highest position (Z ₁ ) among the non-skin-contacting side surfaces of the surface sheet 1 forming the inner wall of the three-dimensional space of the rear surface recessed portion 7 is the step 7a. Direction) and the bottom part 7c is the lowest position (Z ₂ in the same space). Direction). Therefore, in the uneven | corrugated shape by which the back surface recessed part 7 and the back surface convex part 8 are alternately repeated, the bottom part 7c of the back surface concave part will correspond with the top part 8a of the back surface convex part 8. In addition, although the above-mentioned top part 7a and bottom part 7c (back part convex part 8a) of the back surface recessed part 7 are shown as the vertex on a curved surface, it is not limited to this, The periphery may be planar. In that case, the government part 7a can set the highest point among the center point or plane of the plane, and the bottom part 7c (the government part 8a of the back side convex part) can be set as the lowest point among the center point or plane of the plane. In this definition, the depth h ₁ of the back surface recessed portion 7 described above refers to the height difference of the non-skin-contacting side surface of the surface sheet 1 and is the distance from the top portion 7a to the bottom portion 7c. (See FIG. 2-1 (b)). Similarly, the depth h ₂ of the entry portion 71 described above is the distance between the bottom portion 7c and the highest position on the skin-contacting surface side of the entry portion 71 (Fig. 2-1 (c). ) Reference).

Next, with reference to FIG. 3, the back recessed part 7 (back absorber 7v on an absorber body) which is a basic structural part of this embodiment is described in detail, and the effect of this is described. FIG. 3: is explanatory drawing which shows typically the relationship of the surface sheet 1, the covering sheet 32, and the absorbent core 31 in the back surface recessed part 7 (7v of absorber upper surface recesses). . In FIG. 3, it shows with two patterns of (a) and (b). In the pattern of (a), the depth h ₂ of the entry part 71 is shallower than the depression depth h ₁ of the back surface recessed part 7 (h ₂ <h ₁ ), and the space part 72 ( A buffer gap portion 73 having a depth h ₃ is formed together with the absorbent body space portion 72v. In the pattern of (b), (h ₁ = h ₂ ), the space portion 72 is formed, but the buffer gap portion 73 is not formed.

Also in any of the patterns of FIGS. 3A and 3B, the back recessed portion 7 (the back surface recessed portion 7v on the absorber) is formed from the non-skin-contacting surface side z ₂ of the surface sheet 1. By being formed toward the skin contacting surface side z ₁ , the internal space of the liquid-retaining absorbent body 3 under the surface sheet is formed at a position close to the skin of the wearer. This shortens the permeation distance of the liquid to the internal space, and is effective for improving the absorbency of the liquid. Moreover, since the entry part 71 is provided in the back recessed part 7, it can be ensured that the high hydrophilic coating sheet becomes a position near skin, and is quick to draw in the excretion liquid to the absorbent core 31. FIG. From the viewpoint of the liquid attraction, it is preferable that the side wall portion 7b and the entry portion 71 in the back recessed portion 7 abut and are bonded to each other without any gap in the interface thereof (hereinafter, the junction portion). (74)). In this way, the entry portion 71 can directly draw the excretion liquid in the surface sheet 1. Although there exists a method of adhering with the hot-melt adhesive etc. as a formation method of this joining part 74, it is preferable to adhesively bond both fibers by spray application etc. without forming a film of an adhesive agent. As a result, the sparse fiber distance of the side wall portion 7b (surface sheet 1) made of the liquid permeable nonwoven fabric is maintained to quickly transmit the liquid, and the entry portion 71 made of a material having high hydrophilicity (coating The sheet 32 becomes a suction force of the liquid and can directly receive the liquid in the inner absorbent core 31. It is preferable that the structure between members in such a back surface recessed part 7 is arrange | positioned at least in the crotch part C of the diaper 10 from a viewpoint of promptly drawing in, without spreading the excretion liquid.

In order to make the drawability of the above liquid effective, the depth h ₂ of the entry portion 71 is equal to the depth of the recessed portion h ₁ of the rear surface recess 7 (the back surface recess 7v on the absorber). It is preferable that it is 50% or more, and it is more preferable that it is 75% or more. By carrying out more than the said minimum, the liquid residual amount of the part 7a of the surface sheet 1 especially can be reduced. In practice, the depth h ₂ of the entry portion 71 into the back recessed portion 7 is not necessarily uniform in each of the back recessed portions 7, or in some cases, the entry portion 71. There may be a case where the back surface recess 7 which is substantially not formed is confused. In this case, if it is more preferred that the total of the concave portion, the entry portion of the depth (71) (h ₂₎ is the number of things which the at least 50% and preferably 50% or more, 70% or more. By carrying out more than the said minimum, the liquid amount which contacts skin after liquid absorption can be reduced.

Further, the in the preferred range, in the (a) pattern that (h ₂ <h _1), while realizing the improvement of the dragging of liquid fertility, preferably it is a buffer gap portion 73 that as to exhibit the inherent function of the Do. Specifically, the influence on the absorber 3 of the force applied from the surface sheet 1 side can be alleviated. In addition, since the government part 7a of the back recessed part 7 (the back recessed part 7v on the absorbent body) which is in the position closest to the skin does not come into contact with the entrance part 71, moisture is generated in the entrance part 71. Even if this is contained, liquid return can be suppressed and the favorable dry feeling of the surface sheet 1 can be implement | achieved. On the other hand, the pattern (b) which becomes (h ₂ = h ₁ ) is preferable in view of the attraction of the liquid since the entrance portion 71 enters from the side wall portion 7b to the government portion 7a. Therefore, the ratio (a) / (b) of (a) pattern and (b) pattern in the whole back recessed part 7 formed in the surface sheet 1 is in the vicinity of the urination part where the attraction of liquid is considered important. (b) It is preferable that the ratio of a pattern is high, and it is preferable that the ratio of the pattern (a) is high in the vicinity of the buttocks which the liquid return suppression is important. The ratio (a) / (b) of (a) pattern and (b) pattern of back surface recessed part 7 formed in the surface sheet in the vicinity of a urination part is 4/6 from a viewpoint which emphasizes drawability of a liquid. The above is preferable and 2/8 or more are more preferable. Moreover, as for said ratio (a) / (b), 0/10 or less is preferable. The ratio (a) / (b) of the pattern (a) of the back surface recessed part 7 formed in the surface sheet 1 in the vicinity of the buttocks to the pattern (b) is 6 / 4 or more are preferable and 8/2 or more are more preferable. Moreover, as for said ratio (a) / (b), 10/0 or less is preferable.

As described above, a space portion 72 (a space portion 72v in the absorber) is formed in the rear recess 7 ((a) and (b) of FIG. 3). The space portion 72 can diffuse the excretion liquid drawn by the entry portion 71 inside the absorbent body 3 to absorb it directly and efficiently from the wide side of the absorbent core. Thereby, the absorption rate of the excretion liquid from the surface sheet 1 improves, and the spread of the liquid in the skin contact surface side of the surface sheet 1 can be suppressed. In addition, even when the amount of excretion liquid is large at one time, the space portion 72 may temporarily hold the liquid from the surface sheet 1 and serve as an adjustment valve for liquid absorption. And since the space part 72 is low in water holding power unlike the absorbent core 31 which consists of pulp fiber etc., the space 72 can guide liquid to the absorbent core 31 quickly. In this way, the space 72 can immediately recover the space while maintaining the temporary liquid as the adjustment valve of the liquid, and therefore, the space portion 72 can be sufficiently coped not only in the case of large amounts of excretion but also in the case of repeated excretion. Moreover, when the skin contact side of the absorbent core 31 is a substantially flat shape, the effect | action of this space part 72 becomes more effective, and it is preferable. Even so, the skin-facing side of the absorbent core 31 need not be smooth, and the fluffing of the pulp fibers (see the drawing in the small circle (ii) of Fig. 2-1 (a)) reaches the space 72. It is preferable to carry out a quick migration of the liquid to the absorbent core.

(Measurement method of depth h ₁ of backside recess 7, depth h ₂ of entry portion 71, and depth h ₃ of buffer gap 73)

The measurement of the depth h ₁ of the back recessed part 7 enlarges the cross section of the surface sheet 1 which passes through the top part 7a and the bottom part 7c, and the tangent t of the adjacent bottom part 7c. (Refer to FIG. 2-1 (c)) by measuring the distance between the government part 7a. The measurement of the depth h ₂ of the entrance part 71 is performed by measuring the distance of the tangent of the top part 71a of the skin contacting surface side convex part of the entrance part 71, and the said bottom part 7c. The difference was set to the depth h ₃ of the buffer gap 73. (h ₃ = h _1- h ₂ ). The measurement was performed by the expansion by the Keyence VH-3000 microscope and the measurement by the two-point measurement method after the calibration setting. You may use an electron microscope.

Thus, the diaper 10 has the high liquid attracting force of the back surface recessed part 7 (back surface recessed part 7v on an absorber), and the entrance part 71, the space part 72 (space part 72v in an absorber body). This structure combines the effective delivery of liquids. In short, the structure of the back recessed part 7, the entrance part 71 of the covering sheet 32, the space part 72, and the absorbent core 31 cooperates, and it acts as a suppressor while suppressing liquid diffusion from the skin side. The liquid can be diffused from the internal absorbent core 31 to reliably absorb, hold and fix the liquid. Thereby, liquid residual and liquid return on the surface sheet 1 side are suppressed, and favorable dry feeling to a wearer's skin can be realized.

Moreover, in the absorbent core 31 which can absorb and hold | maintain a liquid in a wide surface, the reach | attainment area of the liquid toward the back sheet 2 side also becomes large, and it is possible to discharge moisture from the back sheet 2 to the outside efficiently. Become. As a result, the lowering of the diaper temperature due to the heat of vaporization of moisture is realized on the wide side on the back sheet 2 side, and the increase in moisture in the inside of the diaper 10 (the part surrounded by the back sheet 2 and the wearer's skin) It can be effectively suppressed, making water cracking of the diaper 10 more difficult to occur.

In order to realize the above-described effects, the distance r ₁ between the bottom portion 7c and the bottom portion 7c in the back recessed portion 7 shown in Fig. 2-1 (b) and the depth h of the back recessed portion are shown. ₁ ratio (r ₁ / h ₁₎ of a) is more than 1/1 is preferable, and more preferably at least 10/8. Further, the ratio (r ₁ / h ₁₎ is, it is preferably not more than 3/1, more preferably 10/4 or less. In addition, the ratio (w ₁ / h ₁ ) between the pitch w ₁ between the top portions 7a to 7a of the back recessed portion and the depth h _{1 of the back} recessed portion is preferably 1/1 or more, and 10/8 The above is more preferable. Further, the ratio (w ₁ / h ₁₎ is, it is preferably not more than 3/1, more preferably 10/4 or less. By setting it as the said minimum, it can be set as the surface sheet structure which is easy to enter a coating sheet, and by using below the said upper limit, the volume of the space 72 can be ensured large.

In the surface sheet 1, as mentioned above, it is preferable that the back surface convex part 7 and 7 becomes the back surface convex part 8, and the back surface convex part 8 has a part 8a. . In the back surface convex part 8, as shown in FIG. 3, the surface sheet 1 and the absorbent core 31 become the contact in the government part 8a via the covering sheet 32, and the contact area is It can suppress preferably. By suppressing the contact area with the absorbent core 31, the liquid diffusion on the absorbent core 31 is smoothed, the absorption rate is shortened, and the liquid return to the surface sheet 1 side after the liquid absorption is suppressed. Together with the structure in the said back recessed part 7, it is further effective in suppressing the wetting in the surface sheet 1.

Moreover, in the surface sheet 1, the skin contacting surface side repeats the surface convex part 78 and the surface concave part 88 in accordance with the ups and downs of the back surface concave part 7 and the back convex part 8. It is preferable that it is an uneven | corrugated shape. It is preferable that the uneven | corrugated shape which integrated this front and back is arrange | positioned in the plane direction, and the repetition of an unevenness | corrugation is formed in the multi-direction as a whole in the surface sheet 1 (refer FIG. 4). By the shape of this surface sheet 1, not only can the contact area of the absorbent core 31 and the surface sheet 1 be reduced, but also the contact area of the wearer's skin and the surface sheet 1 can also be reduced. . The reduction of the contact area is more effective in suppressing the wetting of the skin, and also improves the air permeability in the uneven portion, so it is more effective in preventing water cracking. In addition, if the surface sheet 1 is uneven | corrugated in both surfaces, the three-dimensional cushioning property which follows a three-dimensional movement well and is supported by a dot in both surfaces will be expressed. If the top surface 78a of the surface convex part 78 is a rounded curved shape, a soft touch will be acquired with this cushioning property.

In addition, in the uneven shape of the surface sheet 1, as shown in FIG. 4, the side wall surface 88b (= 78b) of the downhill inclination toward the surface recessed part 88 from the surface convex part 78 is formed, It is preferable that the surface recesses 88 be in the form of independent triggers or cups. This makes the collection of excretion liquid and the improvement of liquid absorption performance more effective. This point will be described with reference to FIG. 5.

FIG. 5 is a partially enlarged cross-sectional view showing an enlarged portion of the predetermined cross section of FIG. 2-1 (a). In addition, heat (k ₁ represents a cross-section of the concave-convex Heat), the inner uneven heat (k ₂₎ For heat), the convex part was omitted to show the surface convex part while avoiding the complexity for understanding liquid permeation. In the present embodiment, for example, the excretion liquid a ₁ lowers the side wall portion 78b (= 88b) from the top portion 78a of the surface convex portion 78 (arrow b ₁ ) and the surface concave portion ( It is easy to accumulate in the vicinity of the government 88a of the 88, and becomes difficult to move in the planar direction. Thereby, the diffusivity of the excretion liquid on the skin contacting surface side of the surface sheet 1 can be further suppressed, and the excretion liquid can be moved to a position far from skin in the thickness direction. Moreover, the excretion liquid moved to the surface recessed part 88 is the entrance part 71 from the side wall part 88b (= side wall part 7b of the back side recessed part 7) through the inside junction part 74. Is sucked into (b ₂ ) and drawn into the space portion 72. Then, the liquid diffuses from the space portion 72 in the planar direction (arrow b ₃ ), is led to the absorbent core 31 (arrow b ₄ ), and is fixed. Also, arrows b ₂ to b ₄ Until now, the mechanism of action for the back recessed portion, which is the aforementioned basic structural portion. Thus, the uneven | corrugated shape of the surface convex part 78 and the surface 88 can make the function of the back surface recessed part 7 more effective.

On the non-skin-contacting surface side of the surface sheet 1, the individual back surface convex portions 8 are surrounded by a plurality of back surface recesses 7 and arranged independently from each other in the plane direction, and the individual back surface recesses 7 It is preferable that the spaces are connected to each other in the plane direction. The above independent arrangement is not limited to the rear convex portions 8 and 8 being completely separated from each other, and include at least a portion of the convex portions if at least the periphery of the government portion 8a is separated. This preferred arrangement will be described with reference to FIG. 6.

FIG. 6: is explanatory drawing which shows typically the relationship of the back surface recessed part and the back surface convex part in the non-skin-contacting surface side of a surface sheet in plan view, and is simplified based on the arrangement relationship of the top parts 7a and 8a. It is modeled and shown. Specifically, the government part 7a of the back surface recessed part 7 was made into white circles, and the government part 8a of the back surface convex part 8 was shown as a black circle. In FIG. 6, each area between the government 8a-the government 7a-the government 8a, between the government 7a-the government 7a, and between the government 8a-the government 8a, It becomes a side wall part. The side wall part of the area | region between the government parts 8a-8a was shown by the narrow hourglass figure for the understanding of the said preferable arrangement, and was set as code | symbol m. In addition, the said side wall part is a part which forms the back recessed part 7 and the back convex part 8 continuously, and means both the above-mentioned side wall parts 7b and 8b.

As shown in FIG. 6, the side wall part m is arrange | positioned between the top parts 8a-8a of the back surface convex part 8. As shown in FIG. This side wall part m is not a shape which connects the front part 8a of the back surface convex part 8 completely, and like the narrow hourglass shape which FIG. 6 shows, the sheet thickness direction (FIG. 2-1) in the center part from z ₂ in (b) it is preferably made a shape constricted in the direction of z _1). In the concave portion, the convex portions 8, 8 are incomplete, but divided and become independent, respectively, and in the concave portion of the side wall portion m, the concave portion 7 is contiguous with the space. In short, on the non-skin-contacting surface side of the surface sheet 1, not only the tops 8a-7a-8a but also the tops 8a-8a are uneven. As a result, a space for connecting the back recesses 7 and 7 is formed. For example, as shown in FIG. 7, it is preferable that the side wall part m is formed in arch shape. The space of each back surface recessed part 7 along the arch shape of the side wall part m becomes a state which can freely travel to and from each other like the white arrow shown to FIG. 6 or FIG. If the surface sheet 1 is this preferable shape, the entrance part 71 of the coating sheet 32 will be formed along this shape, and each space part 72 below it will also be connected to each other. Thereby, the excretion liquid attracted to the space part 72 can spread | diffuse freely by dividing the support | pillar of the back surface recessed part 7 more like the white arrow shown in FIGS. 6, 7, and wider of the absorbent core 31 Excretion liquid can be efficiently absorbed and held in terms of immobilization.

In the process of absorbing the liquid shown in Figs. 3 and 5 of the diaper 10, the density difference in which the fiber density of the nonwoven fabric of the surface sheet 1 in the rear recess is increased from the government portion 7a to the bottom portion 7c, or It is desirable to have a density gradient. In this way, the liquid can be quickly penetrated from the skin-contacting surface side and the liquid can be drawn in more strongly. This density difference and density gradient, for example, in the predetermined cross section of the back surface recessed part 7 shown to FIG. 2-1 (b) WHEREIN: The surface sheet 1 which extends from the top part 7a to the bottom part 7c is represented by the thirds (a unit, B unit, C portion) of the height (h ₁₎ of the recess (7), and comparing the average of each fiber density (n _1, n _2, n ₃₎ in these Can be. A portion, B portion, the fiber density portion is _{C, (n 1) <(n} 2) <(n 3) are preferred, and a ratio _{(n 1 / n 2 / n} 3) is, at least 2/6/10 This is preferable and 3/5/10 or more is more preferable. Further, the ratio _{(n 1 / n 2 / n} 3) is, is 8/9/10 below are preferred, and more preferably less than 5/7/10. By setting it as the said minimum, the favorable touch can be ensured, and by using below the said upper limit, the liquid residual of the surface sheet 1 can be reduced.

(Measuring method of density)

Density (n ₁ , n ₂ , n ₃ ) of the top portion 7a, the side wall portion 7b, and the bottom portion 7c of the surface sheet 1 in the above-described backside recessed portion 7 is determined in the following method. It can be measured by.

Based on the depth h ₁ in the back recessed part 7, each part which divided the part of the surface sheet 1 from the front part 7a to the bottom part 7b into A part, B part, and C part, The enlarged observation of the cut surface which passes the top part 7a and the bottom part 7b of a surface sheet using the following scanning electron microscope (adjustment by the magnification which can measure 30-60 fiber cross sections; 150 times or more and 500 times or less) ), The number of cross sections of the fiber cut by the cut surface per fixed area was counted. Next, it converted into the cross-sectional number of the fiber of a 1 mm <2> side, and made this fiber density (piece / mm <2>). The measurement was performed at three points and averaged to make the fiber density of the sample.

Scanning electron microscope; JCM-5100 (brand name) manufactured by Nippon Electronics Co., Ltd.

(Modified example of cross-sectional shape of back surface recessed part and surface sheet)

In the diaper 10, the cross-sectional shape of the back surface recessed part 7 is not limited to the form mentioned above (refer FIG. 2-1 (b)), and can be made into arbitrary shapes as long as it has the above-mentioned liquid absorbency. . For example, as shown in Fig. 8, the government 7a has a spire shape, the government 7a has a plurality of (b), the government 7a is flat (c), the government ( (D) etc. which 7a) are bulging with respect to the width | variety between side wall parts 7b and 7b are mentioned. Similarly, the cross-sectional shape of the surface sheet 1 is not limited to the concave-convex shape of the present embodiment, and any arrangement can be made so long as it enables the arrangement relationship between the back recessed portion, the covering sheet 32 and the absorbent core 31 below it. It can be made in the shape of. For example, as shown in FIG. 9, the shape (a) with which the skin contacting surface side is flat, the back recessed parts 7, and 7 are spaced apart, and the shape (b) with which the top part of the back convex part is flat is mentioned. In the case of the shape like FIG.9 (b), the bottom part 7c of the back surface recessed part 7 is a certain plane of the front part 8a of the back surface convex part 8, and the side wall part 7b of the back surface recessed part 7b. ) Is the intersection of phases of.

(Modification of Absorbent Core)

In the diaper 10, the shape of the absorbent core is not limited to the flat surface of the skin-contacting side of the present embodiment, but may be arbitrarily adopted in which the liquid contained therein can be widely diffused, quickly absorbed, held and immobilized. can do. For example, as shown in FIG. 10, the protrusion absorbing portion 93 corresponds to the groove-shaped recess 91, the block-shaped protrusion absorbing portion 93 divided into the recessed portion, and the recessed portion 91. The absorbent core 90 (FIG. 10 (a)), 90a (FIG. 10 (b)) which consists of the recessed part absorption part 94 which connects the one surface side of the same) is mentioned. When this absorbent core is used, the liquid drawn into the space portion 72 diffuses along the recessed portion 91 or the recessed portion absorbing portion 94 below and is dispersed in each protruding absorbing portion 93 so as to be retained and absorbed. To be fixed. Since the liquid is reliably fixed in a wide range by such a path, liquid return to the surface sheet side hardly occurs. In addition, in these absorbent cores 90 and 90a, when the recess absorption part 94 is made into lower basis weight than the protrusion absorption part 93, the fluid resistance in the recess absorption part 94 is reduced. As a result, liquid diffusion is easy, and liquid retention is reduced, so that the liquid is easily transferred to the protrusion absorbing portion 93. In addition, from the same viewpoint, it is preferable that the recess portion absorbing portion 94 having a low basis weight is lower than the protrusion absorbing portion 93 having a high basis weight. The absorbent cores 90 and 90a may have any of the surfaces of the recess 91 and the surface of the recess absorbent 94 having a low basis weight as the skin-contacting surface side, and may be arbitrarily selected depending on the purpose of the absorbent article. You can do with the arrangement.

In the case where the absorbent core 90 or 90a is employed, the recessed portion 91 or the recessed portion absorbing portion 94 of the rear surface recessed portion 7 in the crotch portion C including at least the excreted portion corresponding region. It is preferable that the arrangement overlap with the space portion 72 (the space portion 72 in the absorber). As a result, the liquid in the space portion 72 tends to be transferred to the recess 91 or the recess absorbing portion 94, and quickly diffuses and is easily fixed.

(Forming method of backside recessed part 7 and entrance part 71)

The absorbent article which has the back recessed part 7 and the entrance part 71 as shown in FIG. 2-2 can be obtained in the normal manufacturing process in this kind of article. For example, in the lamination step of the absorber and the surface sheet in the assembling process of the diaper, the surface sheet 1 is brought into contact with the pressing roll between the pressing roll on which the uneven portion is formed and the anvil roll disposed opposite to the pressing roll. It can be formed by introducing the laminate and partially pressing and heating. At that time, it is preferable to adher the hot melt adhesive intermittently by slot spray coating, spiral coating or the like so that the nonwoven fabric of the front sheet 1 and the covering sheet are brought into close contact with each other to form a back recess. Moreover, it is preferable to adhere | attach more coarsely between a coating sheet and an absorbent core by spiral coating etc. The adhesive coating density q ₁ between the surface sheet and the covering sheet is preferably higher than the coating density q ₂ of the hot melt adhesive between the coating sheet and the absorbent core, and the ratio (q ₁ / q ₂ ) 2/1 or more are preferable and 3/1 or more are more preferable. Further, the ratio (q ₁ / q ₂₎ is, it is preferably not more than 10/1, more preferably 5/1 or less. Moreover, when forming a back surface recessed part with the said press roll, it uses the shaping | molding sheet which has the uneven | corrugated shape as shown in FIG. 4, and the uneven | corrugated shape previously shown in FIG. It is preferable to use the one having elasticity because the adhesion between the surface sheet 1 and the entry portion 71 in the rear concave portion becomes higher, and the entry portion 71 that is deeply indented can be formed.

The manufacture of the said shaping sheet can be performed as follows. The fibrous web before fusion is supplied from the carding machine to the web shaping device so as to have a predetermined thickness, and the fibrous web is fixed on the breathable pedestal with a plurality of protrusions. Subsequently, hot air is blown onto the fiber web on the pedestal at a temperature at which each fiber can be appropriately fused to shape the fiber web along the protrusion on the pedestal, and each fiber is fused. It is preferable that the temperature of the hot air at this time is high temperature with respect to melting | fusing point of the thermoplastic fiber which comprises a fiber web, It is preferable that the temperature difference is 0 degreeC or more, and it is more preferable that it is 5 degreeC or more. Moreover, it is preferable that it is 70 degrees C or less, and, as for the said temperature difference, it is more preferable that it is 50 degrees C or less. Examples of the thermoplastic fibers include polyolefins such as polypropylene and polyethylene, polyesters, polyamides such as nylon 6 and nylon 66, polyacrylonitrile, and the like, or two or more of these kinds of cores (core / sheath) ), Side by side composite fibers, and the like. As a thermoplastic fiber, when using the composite fiber containing a low melting point component and a high melting point component, it is preferable that the temperature of the hot air sprayed on a fiber web is more than melting | fusing point of a low melting-point component, and below melting | fusing point of a high melting-point component. It is preferable that the temperature of the hot air sprayed on a fiber web is more than melting | fusing point +0 degreeC of a low melting point component, It is more preferable that it is melting | fusing point +5 degreeC or more of a low melting point component, It is preferable that it is melting | fusing point -10 degrees C or less of a high melting point component, High melting point It is more preferable that it is melting | fusing point -20 degrees C or less of a component. It is preferable that content of a thermoplastic fiber is 30 mass% or more, and, as for a fiber web and a nonwoven fabric, it is more preferable that it is 40 mass% or more. Moreover, it is preferable that the said thermoplastic fiber content is 100 mass% or less, and it is more preferable that it is 80 mass% or less. The fibrous web and the nonwoven fabric may include fibers (such as natural fibers such as cotton and pulp, rayon and acetate fibers, etc.) that do not inherently have heat sealability.

It is preferable to make the wind speed of the hot air at the time of shaping a fiber web into 20 m / sec or more from a viewpoint of shaping | molding and a texture, and it is more preferable to set it as 30 m / sec or more. The wind speed is preferably 130 m / sec or less, more preferably 100 m / sec or less. If the wind speed is more than this lower limit, a three-dimensional feeling will become enough, and the effect of the cushion property and the collection | cleaning of excretion are fully exhibited, and it is preferable. If the wind speed is less than or equal to this upper limit, the sheet is not opened and the compression resistance is maintained satisfactorily, so that the effects of cushioning and excretion collection can be sufficiently exhibited, which is preferable.

When continuous production is considered, the said base may be the conveyor type or the drum type which can be conveyed, and the aspect which winds up the conveyed type | mold nonwoven fabric with a roll is mentioned. Moreover, you may face MD direction and CD direction to the nonwoven fabric of this embodiment.

As a forming material of the surface sheet 1, the back sheet 2, the absorber 3, and the side sheet 4, what is normally used for an absorbent article can be used.

As the surface sheet 1, a hydrophilic nonwoven fabric is preferable, for example, It is a nonwoven fabric called air through nonwoven fabric, a point bond nonwoven fabric, a span bond nonwoven fabric, a span lace nonwoven fabric, a three-dimensional nonwoven fabric, The fiber is a natural fiber, such as cotton. (B) Fibers subjected to hydrophilization treatment with short fibers of polypropylene, composite fibers of polypropylene and polyethylene, and composite fibers of polyethylene terephthalate and polyethylene are preferable, and those having a basis weight of 15 to 50 g / m 2 or less are preferable. Can be used. Moreover, a hydrophilic perforated film and a hydrophilic nonwoven fabric may partially overlap the crotch part of the surface sheet 1 on the non-skin-surface side of the surface sheet 1.

The back sheet 2 is not particularly limited as long as it is waterproof and has moisture permeability. For example, a fine inorganic filler composed of a hydrophobic thermoplastic resin, calcium carbonate, or the like or an organic polymer having no compatibility is used. The porous film obtained by melt-kneading and forming a film, and extending | stretching the film uniaxially or biaxially is mentioned. Polyolefin is mentioned as said thermoplastic resin. Examples of the polyolefin include high to low density polyethylene, linear low density polyethylene, polypropylene, polybutene, and the like, and these may be used alone or in combination.

As the absorber 3, what is normally used for an absorbent article can be used. Specifically, as the absorbent core, for example, a fiber aggregate or a combination of this and a superabsorbent polymer can be used. As the fibers constituting the fiber aggregate, hydrophilic natural fibers such as pulp fibers, synthetic fibers (preferably hydrophilized) and the like can be used. Although basis weight is not specifically limited, 150 g / m <2> or more and 500 g / m <2> or less are preferable.

Moreover, as a coating sheet which coat | covers an absorbent core, hydrophilization treatment is carried out to nonwoven fabric which consists of hydrophilic fibers, such as thin paper (thin paper), such as hydrophilic tissue paper, crepe paper, cotton, and rayon, and a synthetic resin fiber, for example. The nonwoven fabric which is implemented can be used, for example, an air through nonwoven fabric, a point bonded nonwoven fabric, a span lace nonwoven fabric, a span bonded nonwoven fabric, a spanbond melt-spun bond (SMS) nonwoven fabric, or the like.

As the side sheet 4, for example, a water-repellent nonwoven fabric is preferable, and specifically, a spunbond nonwoven fabric, a spanbond-meltblown (SM) nonwoven fabric, a spanbond-meltblown-spunbond (SMS) nonwoven fabric, and the like Used. As the elastic member for the three-dimensional gathers of the side sheet 4 and the elastic member for the leg gathers, the usual elastic member used for this kind of article can be used, For example, as a material, styrene-butadiene, butadiene, isoprene, neoprene Synthetic rubber, natural rubber, EVA, stretchable polyolefin, polyurethane, etc. are mentioned, As a form, a cross-section is a thing of thread shape (like a flat rubber | gum), such as a rectangle, a square, a circular shape, and a polygonal shape, or A thread-like thing of the multifilament type can be used.

The absorbent article of the present invention has a space portion between the back surface recessed portion, the coated sheet encased therein, the coated sheet, and the absorbent core, thereby suppressing liquid diffusion on the surface sheet side and increasing the attraction force into the liquid. The attracted liquid can be diffused in the absorbent core to quickly fix the liquid inside. Therefore, the absorbent article of the present invention further improves the absorbent performance of the conventional absorbent article, and even if there is a repeated excretion liquid or a large amount of excretion liquid, the liquid is quickly drawn in while absorbing the liquid from the surface sheet side to absorb the inside of the absorbent article. It is urged to diffuse in and can be efficiently absorbed and maintained, thereby exhibiting an excellent effect of suppressing the wetting of the skin, leading to a good feeling of wearing.

In the absorbent article of the present invention, the absorbent core is not limited to the above embodiment as long as the absorbent core has a function of absorbing, holding and immobilizing the liquid therein, and may be, for example, a sheet-like thin film. In the absorbent article of the present invention, the covering sheet is not limited to those of the above embodiments as long as it has a function of covering at least the skin-contacting surface side of the absorbent core to guide the liquid to the absorbent core, for example, liquid diffusion. The member which has a performance may be sufficient, and not only a single layer but multiple layers may be sufficient as it.

The absorbent article of the present invention is not limited to the development type disposable diaper of the above embodiment, and includes, for example, a pants type disposable diaper or a pants type disposable diaper which includes a relationship between a surface sheet, a covering sheet, and an absorbent core. If a part is broken, the diaper available as a tape may be used, or a urine pad, a sanitary napkin, a panty liner, or a light incontinence pad may be used. In addition, the absorbent article of the present invention is not only limited to acupuncture points, but also effective for urine, crayfish, and stool. Moreover, the absorbent article of this invention may also include another member suitably according to a use and a function to the thing of this embodiment.

Next, the disposable diaper 20 as 2nd Embodiment of the absorbent article in this invention is demonstrated with reference to FIGS. The diaper 20 of 2nd Embodiment is further comprised in the structure of the diaper 10 of 1st Embodiment provided with the surface sheet which has the above-mentioned back recessed part, and also the longitudinal direction outward (end lamination part () of the absorber 3). It is characterized by having the integral deformation part 51 of the front sheet 1 and the back sheet 2 in 5)).

Hereinafter, the part which overlaps with the said 1st Embodiment is abbreviate | omitted, and 2nd Embodiment of this invention is described. In addition, the said 1st Embodiment and this 2nd Embodiment do not have independent and exclusive relationship, For example, the 2nd Embodiment can be positioned as contained in the subordinate concept of the said 1st Embodiment. Moreover, the invention which concerns on 1st Embodiment, and the invention which concerns on 2nd Embodiment are in the technical relationship which is related and forms the single concept of invention based on the same or corresponding special technical feature. The same code | symbol may be attached | subjected to the same member, and description may be abbreviate | omitted (However, a dimension and a detailed positional relationship are based on drawing corresponding to each embodiment.).

It is a partially cutaway perspective view which shows typically the disposable diaper as one preferable embodiment (third embodiment) of the absorbent article in this invention from the skin contact surface direction. The diaper shown in this figure is a tape-type disposable diaper, and it is shown by the state which looked at the inner side (skin contact surface side) by slightly bending the diaper of the state expanded to the plane.

First, the outline | summary of the disposable diaper 20 of 2nd Embodiment is demonstrated.

The disposable diaper 20 of 2nd Embodiment is basically the same structural member (surface sheet 1, back sheet 2, absorber 3, and side sheet 4) similar to the diaper 10 of 1st Embodiment. And the like). However, in FIG. 13, in order to avoid the complexity, the whole of the absorber 3 is shown as one member, without showing the division | segmentation of the absorbent core and the covering sheet which comprise the absorber 3.

The disposable diaper 20 of 2nd Embodiment differs from the disposable diaper 10 of 1st Embodiment by the point that the integral deformation part 51 is arrange | positioned in the longitudinal direction outward of the absorber 3. This point is demonstrated below.

The length of the longitudinal direction (Y direction) coincides with the front sheet 1 and the back sheet 2, and is longer than the absorber 3. The front sheet 1 and the back sheet 2 are laminated and bonded together without interposing the absorber 3 outside the longitudinal end portions 3a and 3a of the absorber 3 (this part is It is called an end laminated part 5.). This bonding method can employ | adopt the method used for this kind of article, For example, it can join intermittently by spray coating a hot melt adhesive agent. In the case of this spray coating, coating amount and coating density can be adjusted, rigidity can be suppressed, and both sheets can be firmly fixed and integrated. The end laminated part 5 is located in the abdomen F and the back side R of the diaper 20, and is arrange | positioned around the torso of a wearer at the time of attachment of the diaper 20. At the time of mounting of the diaper 20, the end laminated part 5 arrange | positions from the longitudinal end part 3a side of the absorber 3 to the longitudinal direction end part 20a, 20a of a diaper according to the wearer's extension direction. Becomes The detail of this edge part laminated part 5 is mentioned later.

Next, the edge part laminated part 5 in the diaper 20 is demonstrated with reference to FIG. As shown in FIG. 14, the edge laminated part 5 of the diaper 20 deform | transforms into convex shape integrally in the thickness direction in the state in which the opposing surface of the surface sheet 1 and the back sheet 2 was bonded together. It has a plurality of integrated deformation parts 51. When the surface sheet 1 and the back sheet 2 are deformed in the same thickness direction in each integral deformation part 51, the magnitude | size of the deformation of the integral deformation parts 51, 51 ... You do not have to. In the diaper 20, the integral deformation part 51 consists of the integral skin side deformation part 52 which protruded on the skin contacting surface side, and the integral non-skin side deformation part 53 which protruded on the non-skin contacting surface side. . In each of the integrally deformed portions 51, the sheet is partially turned to the skin side to the non-skin side with respect to the horizontal surface on the non-skin side of the absorber 3. "Integral" in the integral deformation part 51 means that the surface sheet 1 and the back sheet 2 form one convex-shaped part completed as a laminated body, and is limited when it adheres without a clearance. The fine gap may be so small as to prevent the diffusion of the liquid at the interface between the two sheets. In addition, "integral" means that from the other point of view, even if various pressures or the like are applied to the end stacking portion 5, the two sheets in the integrally deformed portion 51 deform substantially the same, and the weight is removed. Both sheets are in close contact with each other to form convex portions so that the shape of the integrally deformed portion 51 can be substantially recovered. In addition, as long as said integration is obtained, another member may be interposed between both sheets.

As shown in FIG. 14, the plurality of integrally deformed portions 51 are arranged in a dispersed direction in the planar direction of the end laminated portion 5. The "distributed arrangement" of the integrally deformable portion 51 is such that the integrally deformable portions 51 are spaced apart from each other and diffused in each direction in a plan view. In 2nd Embodiment, the said two types of integral deformation parts form a plurality of rows alternately in a longitudinal direction (Y direction) and a width direction (X direction), and the arrangement | positioning of the said two types of integral deformation parts of adjacent columns is carried out. This half-pitch zigzag arrangement is arranged. In this way, the some integral deformation part 51 is arrange | positioned widely in the surface direction of the edge part laminated part 5.

The arrangement of the integrally deformed portion 51 will be described with reference to FIG. 15 by focusing on the longitudinal cross-sectional shape of the end laminated portion 5. FIG. 15 shows a part of the longitudinal section from the end 3a of the absorber 3 to the end 20a of the diaper 20 (see FIG. 13), and (A) is a line A-A in FIG. 14. It is a partial enlarged sectional view of a cross section, (B) is a partial enlarged sectional view of the B-B line cross section of FIG.

In FIG. 15 (A), as part of the end laminate 5, five integral skin-side deformation portions 52 and four integral non-skin-side deformation portions 53 alternately form a column A in the longitudinal direction. It is shown. In Fig. 15, the integral skin-side deformation part 52 is Z _1. And the convex portion toward the byeonhyang, any non-skin side transformation unit 53 Z ₂ It is a convex-shaped part turned to the side. The integral skin-side deformation part 52 and the integral non-skin-side deformation part 53 are respectively arrange | positioned at intervals through the other integral deformation part. In FIG. 15B, a cross section of the column B adjacent to the column A is shown as part of the end stacking portion 5. In this row B, four integral skin-side deformation portions 52 and three integral non-skin-side deformation portions 53 are alternately arranged. The arrangement | positioning of the deformation | transformation part in the row B is made to shift | deviate half pitch from the arrangement | sequence of the deformation | transformation part in the column A, and the integral deformation | transformation part changed in the same direction is arrange | positioned so that it may not overlap in the width direction.

By the arrangement of the heat A and B, the whole laminated end portion 5 in the longitudinal cross section, relative to the horizontal plane of the non-skin side of the absorbent body (3), in the thickness direction Z ₁ Direction and Z ₂ The shape meandered so as to wave in the direction. By this integrated deformation, the space between the opposing surfaces of the front sheet 1 and the back sheet 2 constituting the end laminated portion 5 becomes small. In addition, the interface where the space is reduced meanders in the same manner. Therefore, even when the liquid leaks from the absorbent body 3 or when the moisture in the sweat or diaper of the skin is received from the surface sheet 1, the liquid moves as shown by the broken arrow J shown in FIG. It is difficult to do. In short, the minimization of the space due to integration and the meandering structure of the interface act as a resistance of the bleeding and wetting of the liquid at the interface. Moreover, as long as it meandered, the longitudinal direction length of the said interface becomes longer than the length of the edge part laminated part 5, and becomes a set of said resistance force. Thereby, liquid diffusion and liquid leakage can be suppressed effectively. In addition, by arranging a plurality of rows A and B in a half pitch shifted arrangement alternately in the width direction, liquid diffusion can be effectively suppressed by the same effect as described above also in the width direction.

In particular, when the wearer wearing the diaper changes the posture of the body such as lying down or sleeping, the absorber 3 and the end laminated portion 5 are substantially parallel to the bottom surface, or There exists a case where the edge part laminated part 5 inclines downward. In this case, the liquid may enter the space between the opposing surfaces of both sheets of the end laminate 5 due to the action of gravity or the pressure on the absorber 3 due to the body pressure.

When the back sheet 2 is flat as in the prior art, the resistance to liquid migration is low, and the liquid tends to wet and spread due to the surface tension of the liquid impermeable back sheet 2 and the capillary force at the interface. In addition, if there is space, the liquid is likely to flow.

Moreover, the prior art which improves the fit of a trunk, etc. as shown to the said patent documents 3 and 4 etc. could become a factor of a cost increase with the increase of the number of members, complexity of a manufacturing process, etc. On the other hand, if the circumference | surroundings of a waist consist of a surface sheet with an uneven | corrugated surface, and a flat back sheet, constant elasticity can be provided without a complicated process and addition of the number of members. However, there is a space where the liquid accumulates or flows between the front sheet and the back sheet. This part does not have an absorber, and thus does not have a liquid absorption retention function. Therefore, for example, in the case of an infant wearing a diaper or a caregiver, the liquid does not leak out depending on the posture of the wearer's body such as moving the body while lying down.

However, in the diaper 20 of 2nd Embodiment, also in the posture of the wearer's body mentioned above, as shown in FIG. 15, the meandering of the thickness direction in the interface of the edge part laminated part 5 with respect to a liquid is carried out. While exhibiting a resistance action, it exhibits an attraction effect in the thickness direction (Z ₁ ? Z ₂ ) due to gravity to the liquid, and functions as a barrier against the migration or wet spread of the liquid (see FIG. 16). This can minimize liquid diffusion and liquid leakage effectively. From this point of view, it is preferable that the opposing surfaces of both sheets in the integrally non-skin-side deformable portion 53, in particular in the front part 53a, be firmly bonded to exclude the space.

In the present invention, the meandering shape is a shape having a plurality of parts deformed in different directions with respect to the horizontal plane even though the entire end laminate part 5 has a constant horizontal plane. Moreover, from another viewpoint, it can also be said that it is a shape in which two or more deflection points to the thickness direction of the edge part laminated part 5 generate | occur | produced with respect to the non-skin-side horizontal surface of the absorber 3. The changing point is a starting point at which the opposing surfaces of the front sheet 1 and the back sheet 2 change directions with respect to the horizontal direction. This point will be described with reference to FIG. 17. FIG. 17 shows the top of each unitary deformation part 51 in FIG. 15 (the top 52a on the skin-facing surface side, the top 53a on the non-skin-facing surface side), the deflection point 54, and the direction of change ( G) is represented conceptually and schematically. First, horizontal lines FA and FB are the lines which extended the base of the absorber 3, and are also the line located in the thickness center of the edge part laminated body 5. As shown in FIG. Arrows at the left ends of the horizontal lines FA and FB indicate the direction from the absorbent body 3 to the end portion 20a (see FIG. 13) of the diaper 20. The deflection point 54 is a point at which the integral deformation portion 51 intersects the horizontal planes FA and FB and is indicated by a black spot. The direction of change (G) is a direction in which the interface between the two sheets of the end laminate 5 changes directions with respect to the direction of arrows on the horizontal lines FA and FB at the point of change 54, and is indicated by an arrow. In addition, each part in the integral deformation part 51 (the part 52a of the skin contacting surface side, and the part 53a of the non-skin contacting surface side) is shown with the black spot. The parts and the deflection points of each of the integrally deformed portions 51 are represented on the basis of the boundary between the two opposing surfaces from the viewpoint of the resistance action against the liquid migration between the two sheets, and the portion having the gap between the opposing surfaces is For convenience, the skin contacting surface side of the back sheet 2 is shown as a reference. In addition, from the same viewpoint, the direction of change is indicated by an arrow on the basis of the longitudinal direction from the absorber 3 toward the diaper end 20a.

FIG. 17A illustrates the column A of FIG. 15. In column A there are ten shift points 54. The direction of change G in each direction of change 54 is Z _1. Direction of change (G1) and Z ₂ The direction of change G2 facing the direction is alternately arranged. Moreover, FIG. 17 (B) has shown about the column B of FIG. Column B has eight deflection points 54. The direction of change G in each direction of change 54 is Z _1. Direction of change (G1) and Z ₂ The direction of change G2 facing the direction is alternately arranged. Thereby, although the interface of both sheets coincides with the arrow direction of the horizontal line FA as a whole, it can be said that it is a shape which has two or more starting points which amplitude alternately up and down with respect to the horizontal line.

As shown in FIG. 17, the direction of change in the plurality of points of change is Z _1. Direction and Z ₂ By alternately changing in the direction, the longitudinal cross section in the end laminated part 5 forms a meandering shape, and the above-mentioned effect can be exhibited effectively. In other words, if the plurality of deflection points 54 having different deflection directions are arranged in a row, the number of the integrally deformed portions 51 can be arbitrarily set, and the dispersion arrangement is regular as shown in FIGS. 14 and 15. It is not limited to this, Another regular arrangement may be sufficient and an irregular arrangement may be sufficient. As another regular arrangement, for example, as shown in Fig. 18-1, the horizontal portion 55 may be sandwiched between adjacent integrally deformable portions 51, and as shown in Fig. 18-2, the horizontal portion 55 and The combination of the integral skin-side deformation part 52 may be sufficient, and the combination of the horizontal part 55 and the integral non-skin-side deformation part 53 may be sufficient like FIG. 18-3. In any case, the direction of change is Z ₁ while crossing the horizontal part 55 at the plurality of points of change. Direction and Z ₂ The direction becomes the plural arrangement, and the cross section of the end laminated part 5 becomes meandering with respect to the horizontal line.

In addition, as the distributing arrangement in the planar direction of the integrally deformable portion 51, as shown in FIG. 14, the arrangement is not limited to a regular arrangement, and may be another regular arrangement or an irregular arrangement. As another regular arrangement, for example, a combination in which a plurality of integrally deformable portions 51 that are displaced in the same thickness direction in a radial manner may be arranged in a plurality of plane directions. Specifically, as shown in FIG. 19, a plurality of combinations of the central integral non-skin-side deformation portion 53 and the six integral skin-side deformation portions 52 surrounding the periphery may be arranged in a plurality of plane directions. do. In this case, the uneven | corrugated shape by which not only the longitudinal direction of the edge part laminated part 5 but also the cross section of all directions becomes meandering with respect to a horizontal line is formed.

In addition, in the end laminated part 5, as shown by the arrangement | positioning of the width direction shown in FIG. 14, or the combination of (A) and (B) of FIG. 15, the integral skin side deformation | transformation part 52 and the integral non-skin side deformation | transformation part are shown. 53 is alternately arranged also in the width direction. As a result, when a tensile force is applied to the end laminated portion 5, as shown in FIG. 20, the integral deformation portion 51 in which the surface sheet 1 and the back sheet 2 are integrally elongated to return horizontally ( 20 (b)), it is contracted to return to the shape of the original integrally deformed portion 51 by weight (see FIG. 20 (a)). In other words, the integral deformation portion 51 becomes the stretching force of the entire end laminated portion 5. As a result, even if the diaper 20 is firmly tightened and secured so that no looseness occurs around the torso when the diaper 20 is attached, the elasticity of the end laminated portion 5 does not press the torso around the wearer's torso. It can be secured. Therefore, a good feeling of attachment is obtained. Thus, the diaper 20 can satisfy | achieve and satisfy | achieve the fitting property by elasticity | strength and the high heat release in a trunk circumference simultaneously.

In forming the end laminated part 5 in the disposable diaper 20 of 2nd Embodiment, the surface sheet 1 is an end laminated part as a nonwoven fabric (refer FIG. 4) used for 1st Embodiment. It is preferable that the recessed part 7 arrange | positioned and formed up to the area | region of (5). In this case, also in the edge part laminated part, it becomes the back surface convex part 8 around the back surface recessed part 7, and the back surface recessed part 7 and the back surface convex part 8 alternately and are substantially equally spaced in a plane direction. It is arranged adjacent to each other periodically.

In addition, as mentioned above, in 2nd Embodiment, the back surface recessed part and back surface convex part in the edge part laminated part 5 are the edge part back surface recessed part 7w and the end surface convex part 8w from the arrangement formation position. It calls out, and demonstrates distinctly from the absorber upper surface recessed part 7v and the absorber upper surface convex part 8w of 1st Embodiment. Or the "back surface recessed part 7w in the end laminated part 5" and the "back surface convex part 8w in the end laminated part 5" may be called, and it does not distinguish in particular and is simply " It may be called "rear surface recessed part 7w" and "rear surface convex part 8w."

In this case, the ridge part which part of the back sheet 2 which consists of liquid-impermeable film (water-impermeable moisture-permeable film) etc. with respect to the edge part back surface recessed part 7w of the surface sheet 1 protruded and squeezed in ( 21) (see FIG. 21). The recess 7w and the ridge 21 are in close contact with each other at the end, and are integrated to form the integral skin-side deformation part 52. At the same time, by forming the ridge portion 21, the back surface is formed along the shape of the surface sheet 1 that descends from the side wall portion 7b of the end back surface recess 7w to the top portion 8a of the end back convex portion 8w. The sheet 2 is deformed, so that the integral non-skin side deformed portion 53 is formed. In other words, the back sheet 2 is shaped into a concave-convex shape so as to match the concave-convex shape on the skin-contacting surface side of the surface sheet 1. Thus, the end back concave portion 7w and the end back convex portion 8w of the surface sheet 1 substantially together with the ridge 21 of the back sheet 2 in the case of a shape of a cone, in particular a cone or a truncated cone. The integral skin-side deformation portion 52 and the integral non-skin-side deformation portion 53 become a shape close to the same vertebral shape. Such a shape is preferable because the diffusion of the liquid is suppressed not only in the longitudinal direction (X direction) and the width direction (Y direction) but also in the multi-direction, and the elasticity in the multi-direction becomes easy to be expressed. It is preferable that the plunged depth of the raised portion 21 reaches the top portion 7a of the recessed surface 7w at the end face so that a space is not formed as much as possible from the viewpoint of the above-described action of the integrally deformed portion 51, but not necessarily. Not limited to this, the depth h ₄ of the raised part 21 may be shallower than the recessed depth h ₁ of the recess 7w. If there are some such gaps, it is preferable because the softness of the nonwoven fabric used as a surface sheet can soften the contact of a surface sheet and skin.

Although the shape and dimensions of the surface sheet 1 and the back sheet 2 according to the second embodiment are not particularly limited, in order to effectively exhibit the desirable usability described above, it is somewhat different depending on the size and use of the absorbent article to be used. , if the end depth (h ₁₎ of the recess (7w) is more than 0.4 mm is preferable, and more preferably more than 1 mm. Further, if the end depth (h ₁₎ of the recess (7), and preferably not more than 4 mm, more preferably less than 3 mm. Also the depth (h ₄₎ of the ridge portions 21 of the backsheet (2), is 0.2 mm or more is preferred, more preferably at least 0.5 mm. The depth (h ₄₎ of the raised portions 21, and preferably not more than 3.5 mm, more preferably less than 2 mm. It is preferable that it is 30% or more with respect to the depth h ₁ of the recessed part 7w when the depth h ₄ of the ridge 21 is an edge part, and it is more preferable that it is 50% or more. By carrying out more than the said minimum, the liquid residual amount of the part 7a of the surface sheet 1 especially can be reduced. End If the depth (h ₄₎ is above 50% the number of things that it is preferable that at least 50%, more preferably in 70% or more, 90 of the total number of the recesses (7w), ridge portions 21 It is most preferable that it is% or more. In addition, an end if it is more preferred that of the total number of the recesses (7w), the number of things that the depth (h ₄₎ of the raised portion 21 on which the 100% or more, and preferably 5% or more, 10% or more. By carrying out more than the said minimum, the liquid amount which contacts skin after liquid absorption can be reduced.

In addition to the realization of the working end portion is a concave portion (7w) state (7a) of - the ratio of depth (h ₁₎ of (7a) pitch (w ₂₎ and the end portion is a concave portion (7w) between (w ₂ / h ₁ ) is preferably 1/1 or more, more preferably 10/8 or more. Further, the ratio (w ₂ / h ₁₎ is, it is preferably not more than 3/1, more preferably 10/4 or less. By setting it as the said minimum, it can be set as the surface sheet structure which is easy to enter a coating sheet, and by using below the said upper limit, the volume of the space part Q can be ensured large.

(Measurement Method of Depth (h ₁ ) of Concave Part 7w and Depth (h ₄ ) of Raised Part 21)

The measurement of the depth h ₁ of the concave portion 7w at the end portion enlarges the cross section of the surface sheet 1 passing through the top portion 7a and the bottom portion 7c, and the tangent t of the neighboring bottom portion 7c. ) (See Fig. 21) to measure the distance between the government 7a. The measurement of the depth h ₄ of the ridge 21 is performed by measuring the distance of the tangent t between the skin-contacting surface side convex portion 21a of the ridge 21 and the bottom 7c. The depth h ₅ of the buffer gap 73 of the difference was set to (h ₅ ). = h ₁ -h ₄ ). The measurement was performed by the expansion by the Keyence VH-3000 microscope and the measurement by the two-point measurement method after the calibration setting. You may use an electron microscope.

(Variation of Cross-sectional Shape of End Back Recess 7w and Surface Sheet)

The cross-sectional shape of the edge part back surface recessed part 7w and the surface sheet 2 is not limited to the above-mentioned form, As long as it exhibits the above-mentioned action, it can be set as arbitrary shapes. For example, the form etc. which were demonstrated with reference to FIGS. 8 and 9 in 1st Embodiment can be employ | adopted.

(Formation method of the integral deformation part 51)

The absorbent article in which the integral deformation part 51 (integral skin side deformation part 52 and the integral non-skin side deformation part 53) as shown in FIG. 14 and FIG. 15 is formed in the end laminated part 5 is It can obtain in the normal manufacturing process in a kind of article. For example, in the step of laminating the surface sheet 1 and the back sheet 2 via the absorber 3, the laminated portion of the surface sheet 1 and the back sheet 2 without the absorber interposed therebetween is uneven. It can be formed by introducing the surface sheet 1 so as to be in contact with the pressure roll, and pressurizing and heating between the additionally formed pressure roll and the anvil roll disposed opposite the pressure roll. In that case, it is preferable to intermittently bond a hot melt adhesive by slot spray coating, spiral coating, etc. so that the surface sheet 1 and the back sheet 2 may contact and the integral deformation part 51 may be formed. Moreover, in this formation process, when using the nonwoven fabric sheet (refer FIG. 4) previously shape | molded in uneven | corrugated shape as shown in 1st Embodiment mentioned above, the integral skin side deformation part 52 and integral ratio which were closely integrated. It is preferable because the skin-side deformation part 53 can be formed satisfactorily.

Production of the molded nonwoven fabric sheet can be carried out by the method described in the first embodiment.

In the second embodiment, it is preferable that the opposing surfaces of the front sheet 1 and the back sheet 2 of the end laminated portion 5 are in close contact with each other, but do not impair the function of the integrally deformed portion 51. In the range, different members may be interposed between the sheets. The interface of both sheets in this case means between the opposing surfaces of both sheets including the other member interposed therebetween.

As another member, the elastic member for reinforcing the elasticity of the trunk | drum peripheral part containing the edge part laminated part 5 of the diaper 20 is mentioned, for example (not shown). Elasticity reinforcement of a trunk circumference part aims at the improvement of the fitting property with respect to the wearer of a diaper, and is obtained by forming a plurality of elastic members in the width direction between the front sheet 1 and the back sheet 2. . In the diaper 20 before wearing, the back flaps 17 and 17 (refer FIG. 13) on both sides of the back side part R are tensioned and fixed to the abdomen. At that time, the elasticity of the end portion laminated portion 5 and the elasticity of the elastic member are easily extended to conform to the wearer's body shape, and a good fit feeling can be obtained by proper shrinkage at the time of fixing. In addition, even after movement of the body, it is easy to follow the change of the wearer's parity flexibly, and good fit can be maintained. At the time of contraction of the elastic member, wrinkles and wrinkles are likely to occur in the sheet 2 on the front sheet 1 and the rear surface of the end laminated portion 5. Also in this case, in the end laminated part 5 of 2nd Embodiment, the some sheet | seat 2 is integrally contacted and integrated in the surface sheet 1 and the back surface, and the some integral deformation part 51 changed in the thickness direction is planar. Since it is disperse-distributed in the shape, it is hard to become wrinkles and wrinkles of a longitudinal direction. The wrinkles or wrinkles are likely to be divided and dispersed by the integral deformation portion 51. This is preferable because of good elasticity reinforcement, liquid diffusion and suppression of liquid leakage.

As an example of said other intervening member, the nonwoven fabric sheet 9 of the magnitude | size which fits in the range of the end laminated part 5 is interposed between the front sheet 1 and the back sheet 2, and is mentioned. This nonwoven fabric sheet 9 can give thickness to the abdominal part F and back side part R which form the trunk | circumferential part of the diaper 20, and can provide a soft touch. Moreover, as shown in FIG. 22, the nonwoven fabric sheet 9 is shape | molded and integrated along the unevenness | corrugation which the integral deformation | transformation part 51 (the integral skin side deformation | transformation part 52 and the integral non-skin-side deformation | transformation part 53) make. . Thereby, the nonwoven fabric sheet 9 is preferable because it fills a small gap and also becomes the resistance of the flow of the liquid, which can more effectively suppress the liquid diffusion and the liquid leakage.

As a forming material of the surface sheet 1, the back sheet 2, the absorber 3, and the side sheet 4, what is normally used for an absorbent article can be used. Specifically, the raw material etc. which were illustrated in 1st Embodiment are mentioned. In addition, the absorber 3 is not limited to the above-mentioned as long as it has a function of absorbing, holding and immobilizing a liquid therein, and may be, for example, a sheet-like thin film.

The absorbent article of the present invention exhibits an excellent effect of improving the anti-loosening property in the portion not interposed between the absorbers.

The absorbent article of the present invention is not limited to the deployment type disposable diaper of the above embodiment, and the front sheet and the back sheet can be widely applied to a laminated structure in the outer side of the absorber. Here, the surface sheet and the back sheet can be defined as the liquid-permeable sheet on the skin-contacting surface side and the sheet on the non-skin-contacting surface side, which are directly and indirectly laminated and integrated at the end of the article where the absorber is not disposed. As long as this definition corresponds, the form of a front sheet and a back sheet is not limited to the thing of the said embodiment, The thing of various structures can be employ | adopted. The absorbent article of the present invention may be, for example, a pants-type disposable diaper or a diaper that can be used as a tape type if a part is broken as a pants-type disposable diaper, or a urine pad, a sanitary napkin, a panty liner, or a light incontinence pad. do. In addition, the absorbent article of the present invention is not only limited to menstrual blood, but also effective for urine, crayfish, and stool.

Another embodiment of the absorbent article according to the present invention will be described with a light incontinence pad. The hard incontinence pad is provided with a liquid permeable surface sheet disposed on the skin surface side at the time of wearing, a back sheet disposed on the non-skin-contacting surface side, and an absorber interposed between both sheets, and is vertically long (not shown). ). The incontinence pad is used by attaching a non-skin-contacting surface made of a back sheet to a cloth made of cloth or the like. At that time, the longitudinal direction of the incontinence pad is disposed from the lower abdomen of the wearer to the buttocks. At the end portion in the longitudinal direction of the incontinence pad, an end stack is formed in which the front sheet and the back sheet are directly and indirectly laminated and bonded without interposing the absorbent body. This edge part laminated part is small compared with the area | region where an absorber is interposed between the said sheets. For this reason, in the case of the conventional incontinence pad, when affixing on underwear, a space is easy to generate | occur | produce between skin and it cannot be said that a liquid flows and does not leak.

However, in this invention, in the said end laminated part, similarly to the embodiment of the disposable diaper 20 mentioned above, the front sheet and the back sheet are completed as a laminated body, and the integral deformation part which deform | converted in convex shape in the thickness direction of the sheet | seat is formed. Doing. In addition, a plurality of the integral deformation parts are alternately arranged in the width direction. Thereby, the integral deformation part becomes the elastic force of the whole end laminated part, and it adheres to skin, and it can implement | achieve and satisfy | fill simultaneously the fitting property by high antispill property and elastic force.

Next, the disposable diaper 30 as 3rd Embodiment of the absorbent article of this invention is demonstrated with reference to FIGS. 25-28. The diaper 30 of 3rd Embodiment uses the surface sheet 1 which arrange | positioned the back recessed part 7 and the back convex part 8 similarly to the diaper 10 of 1st Embodiment. In the third embodiment, from the standpoint of improving the absorption performance of the liquid, the back concave portion 7 is combined with the back convex portion 8 and the sublayer 6 surrounded by the back concave portion 7. It is characterized by having a configuration of.

In addition, it is not independent and exclusive relationship with the said 1st and 2nd embodiment, and this 3rd embodiment, For example, 3rd embodiment is included in the subordinate concept of the said 1st and 2nd embodiment. Can be positioned. Moreover, the invention which concerns on 1st and 2nd embodiment, and the invention which concerns on 3rd embodiment are in the technical relationship which is related and forms the single concept of invention based on the same or corresponding special technical feature. The same members may be denoted by the same reference numerals and the description thereof may be omitted. (However, the dimensions and the detailed positional relationship are in accordance with the drawings corresponding to the respective embodiments.)

It is a partially cutaway perspective view which shows typically the disposable diaper as one preferable embodiment (3rd embodiment) of the absorbent article in this invention from the skin contact surface direction. The diaper shown in this figure is a tape-type disposable diaper, and it is shown by the state which looked at the inner side (skin contact surface side) by slightly bending the diaper of the state expanded to the plane.

First, the outline | summary of the said disposable diaper 30 of 3rd Embodiment is demonstrated.

The disposable diaper 30 of 3rd Embodiment is basically the same member structure (surface sheet 1, back sheet 2, absorber 3, and side sheet 4) similar to the diaper 10 of 1st Embodiment. And the like). However, in FIG. 25, in order to avoid the trouble, the absorber 3 which comprises the absorbent body 3 and the covering sheet is not shown, but the whole absorbent body 3 is shown as one member.

In the diaper 30 of 3rd Embodiment, the point which the liquid permeable sublayer 6 is arrange | positioned between the surface sheet 1 and the absorber 3 differs from the diaper 10 of 1st Embodiment. The sublayer 6 has a substantially rectangular shape that is narrower than the back sheet 2, and the longitudinal direction thereof coincides with the longitudinal direction of the back sheet 2 so as to cover the skin-facing surface side of the absorber 3. It is arranged.

The sublayer 6 is a member that improves the absorption performance by quickly drawing liquid from the surface sheet 6, diffusion of the liquid in the planar direction, and efficient delivery of the liquid to the absorber 3. In addition, the sublayer 6 can increase the member thickness by forming a predetermined distance between the skin-contacting surface side of the diaper 30 and the absorber 3. Thereby, liquid return to the surface sheet 1 side is suppressed, and it is effective in suppressing the humidity of the diaper 30 inside.

The material of the said front sheet 1, the back sheet 2, and the water absorption part 3 can employ | adopt the same thing as 1st Embodiment. As the sublayer 6, although details, such as a material, are mentioned later, it consists of a sheet mainly consisting of a liquid permeable fiber material. In addition, the sublayer 6 preferably has a lower fiber density than the surface sheet from the viewpoint of liquid permeability and diffusion ���.

Next, with reference to FIG. 26A and 26B, the cross-sectional shape of the diaper 30 is demonstrated, and the structure of the surface sheet 1 and the sublayer 6 is demonstrated. FIG. 26A (1) is a cross sectional view taken along the line II-II shown in FIG. 25, and (2) is a partially enlarged cross sectional view schematically showing the arrangement relationship between the surface sheet and the sublayer 6. FIG. FIG. 26B is a photograph substituted for drawing a cross section of the disposable diaper 30. In addition, in the drawing substitute photograph of FIG. 26B, the part which the back surface convex part 8 of the surface sheet 1 abuts on the sublayer 6 was shown as the part enclosed with the dashed circle.

As shown in FIG. 26A (1) and FIG. 26B, the cross-sectional shape of the diaper 30 has the convex part 8 (the absorber back surface convex part 8v) when the surface sheet 1 is with respect to the absorber 3 And a concave-convex shape in which the back concave portion 7 (the back surface concave portion 7v on the absorber) is alternately repeated. And in the back surface convex part 8 (back surface convex part 8v on an absorber), the surface sheet 1 and the sublayer 6 abut.

According to the present invention, the structure of the abutment portion (hereinafter, the abutment portion is denoted by reference numeral 63) of the surface sheet 1 and the sublayer 6 enables the liquid attraction of the sublayer and the liquid diffusion. The further reduction of the remaining of the liquid is realized while maintaining the properties and the liquid return preventing property and described later. The structure of this surface sheet 1 and the sublayer 6 is further demonstrated with reference to FIG. 26A (2).

As shown in Fig. 26a (2), the top sheet (1) projections (8) is a non-skin surface projecting side, the non-skin abutment face side (Z ₂₎ from the skin abutment face side (Z ₁₎ is formed of It is. Many of these back surface convex parts 8 are arrange | positioned periodically adjacent at substantially equal intervals in a surface direction. And, between the back of each convex portion 8, it is from the non-skin abutment face side (Z ₂₎ in the recessed surface side (Z ₁₎ abutting the skin is fit with a recess (7). This arrangement is an arrangement in which the individual rear convex portions 8 gradually spread in each direction in a plan view. Thereby, the non-skin-contacting surface side of the surface sheet 1 becomes an uneven | corrugated shape. Moreover, in 3rd Embodiment, the surface recessed part 88 is formed in the skin contacting surface side of the surface sheet 1 corresponding to this back surface convex part 8, and the surface sheet corresponding to the back surface recessed part 7 The surface convex part 78 is formed in the skin contact surface side of (1).

As mentioned above, the back surface convex part 8 is a part which protruded to the absorber 3 side in the non-skin-contacting surface side of the surface sheet 1. And the back surface convex part 8 is in contact with the sublayer 6 at the contact part 63 (refer FIG. 27). The contact portion 63 fills the gap between the absorber 3 and the surface sheet 1, and the suction force from the absorber 3 is transmitted to the surface sheet 1 via the sublayer 6. Easy to lose In addition, the fiber density of the sublayer 6 in the contact part 63 is higher than the fiber density of the other sublayers (Hereinafter, the part of the sublayer 6 with a high fiber density is closed part ( The part 61 of the sublayer 6 with a low fiber density is called a rough part 62. Thereby, the capillary force of the close part 61 of the sublayer 6 attracts a liquid rather than the rough part 62 of the sublayer 6, and with the suction force of the absorber 3, the surface sheet 1, especially a back surface The liquid which is easy to remain in the convex part 8 can also be attracted actively. Sublayer 6 then efficiently guides the liquid to absorber 3. As a result, the suppression of liquid residual of the surface sheet 1 is further improved, and the humidity suppression between the skin and the surface sheet 1 is further improved.

In 3rd Embodiment, the back surface convex part 8 becomes the rounded part 8a, and the contact area with the sublayer 6 in the contact part 63 is suppressed preferably. Thereby, liquid return can be suppressed and liquid residual reduction in the contact part 63 can be implement | achieved. Moreover, it is effective for suppressing the wetting in the surface sheet 1, without inhibiting the liquid absorption performance in the back surface recessed part 7 mentioned later by suppressing a contact area. If this effect is exhibited, the back surface convex part 8 of the surface sheet 1 is not limited to the front part 8a of 3rd Embodiment, and may be planar shape.

In the present invention, the constituent fibers of the back surface convex portion 8 and the convex portion 61 of the sublayer 6, which are in contact with the abutting portion 63, are not filmed, respectively, but are interposed between the fibers from the viewpoint of reducing the liquid residue. Is maintained. This is different from the film formation of the fiber by the conventional heat seal etc., and migration of a liquid is not inhibited. And the capillary force of the close part 61 of the sublayer 6 can be utilized, and the liquid in the surface sheet 1 can be guide | induced strongly to the absorber 3. Moreover, since it is not made into a film, the contact part 63 is not hardened and a touch improves. And the bulk and cushioning by the surface sheet 1 and the sublayer 6 are not impaired, and a favorable wearing feeling is obtained. Moreover, since the contact part 63 does not have rigidity by film-forming, even if there is pressurization of the thickness direction from the surface sheet 1 side, the force is not transmitted downward at the contact part 63 as it is, and it is soft. Lose. Therefore, liquid return by pressurization becomes less likely to occur, which is preferable.

Moreover, it is preferable that the contact part 63 of the back surface convex part 8 and the sublayer 6 mixes the part joined by the hot melt adhesive etc., and the part which is not joined by the adhesive agent etc. are mixed. Thereby, the balance of liquid residual reduction and stabilization of the contact part 63 can be balanced. Moreover, it is preferable to minimize the part joined with an adhesive agent, and it is preferable to reduce the joining part in an excretion part correspondence area also about the range. By doing in this way, a flexible wearing feeling can be obtained, preventing the flow of the liquid mentioned later to the smooth absorber to be impeded by an adhesive agent. Moreover, the part which the back part convex part 8 and the contact | adherence part 61 in the sublayer 6 do not need to be the whole area | region of the surface sheet | seat 1, but the crotch part containing at least the excretion part correspondence area | region ( It is preferable to carry out in C). In addition, the excretory part corresponding area | region is the part which accommodates excretion, such as urine or a stool directly, and its vicinity.

In view of this, the ratio (g ₁ / g ₂₎ of the can ₍₁ g) and the non-earthed be agreed abutment portion (g ₂₎ the bonded portion abutting with an adhesive and the like, and preferably at least 1/1, 1/2 The above is more preferable. Further, the ratio (g ₁ / g ₂₎ is not more than 1/8 is preferable, and more preferably 1/4 or less. Bonding of the surface sheet 1 and the sublayer 6 becomes stable by using more than the said minimum, and water absorption inhibition by an adhesive agent can be prevented by carrying out below the said upper limit. Moreover, also in the contact part 63 adhere | attached with the hot-melt adhesive agent, it is preferable not to form a film | membrane of an adhesive agent, but to point-bond both fibers by spray coating etc. Thereby, even if the fiber of the back part convex part 8 and the close part 61 of the sublayer 6 joins, the clearance gap between both fibers is easy to be maintained.

In addition, from the standpoint of stabilization of the contact portion 63, as shown in FIG. 27, the contact portion 61 of the sublayer 6 forms a recess recessed toward the non-skin-contacting surface side, and the rear surface is convex in the recess portion. It is preferable that the part 8 enters and touches. If it is in this state, even if it does not adhere | attach the mill part 61 and the back convex part 8 firmly, a contact state will not fall easily and it will be easy to stabilize. Moreover, even if the area area of the mill portion 61 is not widened, the surface where the rear surface convex portion 8 is in contact with the mill portion 61 at the portion where the recess is enclosed is moderately wide, so that the transfer efficiency to the absorbent body 3 is improved. On the other hand, in the back surface recessed part 7 mentioned later, the rough part 62 of the sublayer 6 is bulky, and the recessed space part 72w of the said back surface recessed part 7 (sublayer upper space part 72w) It is preferable that the liquid in the recessed space portion 72w is easily guided if it is slightly entrapped in the)). It is preferable that it is 30% or more with respect to the thickness of the rough part 62, and, as for the thickness of the recessed part of this contact part 61, it is more preferable that it is 50% or more. Moreover, it is preferable that it is 90% or less with respect to the thickness of the rough part 62, and, as for the thickness of the recessed part of the said contact part 61, it is more preferable that it is 70% or less. By setting it to the above lower limit, it is possible to suppress the return of liquid in the contact portion and to increase the water vapor into the diaper, and to make the contact state of the surface sheet 1 and the sublayer 6 stably be maintained by setting it below the upper limit. do.

On the other hand, the back surface recessed part 7 is a recessed part of the non-skin-contacting side surface of the surface sheet 1, and the side wall part which goes to the bottom part 7c from the government part 7a which the surface sheet 1 along the recessed part makes up It is formed by (7b) (refer FIG. 26A (2)). The rough part 62 of the sublayer 6 is arrange | positioned at the position of the back surface recessed part 7. Between the back recessed part 7 and the rough part 62 of the sublayer 6, it becomes the recessed space part 72w. The recessed space portion 72w is substantially a void portion even if the fiber material of the surface sheet 1 or the sublayer 6 is slightly rubbed. By being a space | gap, the fluid flow resistance of the liquid permeate | transmitted from the surface sheet 1 is low. And since the recessed space portion 72w is in a position relatively close to the skin side by being in the rear recessed portion 7, it is easy to quickly receive the liquid from the top portion 7a or the side wall portion 7b, and thus the surface sheet ( 1) It is easy to permeate the liquid received by vigorously. Moreover, such recessed space portion 72w is also preferable as a buffer site for mitigating the influence of the force from the surface sheet 1 side.

In addition, since the fiber 62 is not as high as the close part 61 of the rough part 62 of the sublayer 6, the attracting property and liquid diffusivity of the sublayer 6 intrinsic function can be exhibited. And the rough part 62 can guide | lead the liquid accommodated in the recessed space part 72w to the absorber 3 quickly in a large area. From this viewpoint, it is preferable that the fiber density of the sublayer 6 is lower than the fiber density of the vicinity of the back recessed part 7 of the surface sheet 1. Moreover, by the structure of the surface sheet 1, the recess space part 72w, and the rough part 62 of the sublayer 6, the distance between a wearer's skin and an absorber can be enlarged, and thickness can be ensured. Thereby, liquid return to the skin side can be suppressed preferably.

As mentioned above, in the back surface recessed part 7, the absorption speed of the excretion liquid from the surface sheet 1 improves by the combination of the recessed space part 72w and the rough part 62 of the sublayer 6, Further, the diffusion of the liquid on the skin-contacting surface side of the surface sheet 1 can be suppressed. In addition, even when the amount of excretion liquid is large at one time, the recess space portion 72w temporarily holds the liquid from the surface sheet 1 and may serve as an adjustment valve for liquid absorption. Since the recessed space portion 72w has a low water holding power unlike the absorbent body 3 made of pulp fibers or the like, the recessed space portion 72w can quickly lead the liquid to the absorber 3 together with the liquid diffusion action of the sublayer 6. Can be. Thus, the combination of the recessed space portion 72w and the jaw portion 62 of the sublayer 6 can immediately recover the space while maintaining the temporary liquid as the adjustment valve of the liquid, so that not only a large amount of excretion, Even in the case of repeated excretion, it can fully respond. Moreover, if the skin contact side of the absorber 3 is a substantially flat shape, this effect becomes more effective and it is preferable.

As for the shape of the back surface recessed part 7, the cross-sectional shape of the back surface recessed part 7 which the side wall part 7b makes is substantially parabolic in shape from the viewpoint of the absorption speed mentioned above, and the space shape of the back surface recessed part 7 It is preferable to have a shape close to a cone (such as a cone, a cone, a cone, a cone, a temple cone, etc.) such as a cone or a cone with roundness in (7a). The gentle inclination of the vertebral shape can quickly draw more liquid into the recess space portion 72w while permeating the liquid in the thickness direction without inhibiting the pressure during liquid excretion.

Further, if in government (7a) is if the recess 7 the highest position of the abutment non-skin fit the side of the top sheet (1) forming the inner wall of the three-dimensional space (Z ₁ direction) of the recess (7) Site, the bottom (7c) is the lowest position in the same space (Z ₂ Direction). The bottom portion 7c of the back recessed portion corresponds to the top 8a of the backside raised portion 8. In addition, although the above-mentioned top part 7a and bottom part 7c (back part convex part 8a) of the back surface recessed part 7 are shown as the vertex on a curved surface, it is not limited to this, The periphery may be planar. In that case, the government part 7a can set the highest point among the center point or plane of the plane, and the bottom part 7c can be set as the lowest point among the center point or plane of the plane. In this definition, the depth h ₁ of the back surface recessed part 7 is the height difference of the non-skin-contacting side surface of the surface sheet 1, and is the distance from the government part 7a to the bottom part 7c (FIG. 26A). (2)).

Although the depth h ₁ of the back recessed part 7 differs according to the magnitude | size and a use of an absorbent article, and is not determined arbitrarily, 0.5 mm or more is preferable and 1 mm or more is more preferable. Further, if the depth (h ₁₎ of the recess (7), and preferably not more than 4 mm, more preferably less than 3 mm. The depth h ₁ of the rear recess 7 enlarges the cross section of the surface sheet 1 passing through the top 7a and the bottom 7c, and the tangent t ₁ of the neighboring bottom 7c ( 26a (2)) and the distance from the top 7a. For measurement, the measurement is performed by the expansion by the Keyence VH-3000 microscope and by the two-point measurement method after calibration setting. You may use an electron microscope.

As mentioned above, the area | region of the back surface recessed part 7 (the combination of recessed part space part 72w and the rough part 62), and the area | region of the back surface convex part 8 (rear surface convex part 8 and the contact part 61) Contact portion 63) cooperates with each other to increase the liquid absorption performance and quickly lead the liquid to the absorber 3 to suppress the return of the liquid and at the same time improve the liquid residual suppression. Thereby, contact of the liquid with the wearer's skin is further suppressed, and the humidity reduction effect between the skin and the skin surface side of the diaper 30 is further improved. It is preferable that such a structure between members is arranged at least in the crotch portion C of the diaper 30. A good dry feeling to the wearer's skin can be realized.

In addition, the absorber 3 absorbs and retains the liquid diffused by the sublayer 6 and the concave portion space portion 72w in a large surface, and the area of arrival of the liquid toward the back sheet 2 side also increases. And it becomes possible to discharge moisture from the back sheet 2 to the outside efficiently. As a result, the lowering of the diaper temperature due to the heat of vaporization of moisture is realized on the wide side on the back sheet 2 side, and the increase in moisture in the inside of the diaper 30 (the part surrounded by the back sheet 2 and the wearer's skin) is achieved. It can be suppressed effectively, and it becomes hard to produce the water crack of the diaper 30 more.

In the present invention, the fiber density (m ₆₁ ) of the closed portion 61 of the sublayer 6 is preferably 15 pieces / mm 2 or more, and more preferably 20 pieces / mm 2 or more from the viewpoint of realizing the above-described effect. Do. Moreover, it is preferable that the said fiber density (m ₆₁ ) is 120 piece / mm <2> or less, and it is more preferable that it is 80 piece / mm <2> or less. In addition, the fiber density ₍₆₂ m) of the demodulator (62) of the sub-layer (6) is more preferably not less than preferred, and 15 / ㎟ or more, 10 / ㎟. Moreover, it is preferable that the said fiber density (m ₆₂ ) is 100 piece / mm <2> or less, and it is more preferable that it is 60 piece / mm <2> or less. Then, the ratio (m ₆₁ / m ₆₂₎ of milbu 61, the fiber density ₍₆₁ m) and the demodulator 62, the fiber density ₍₆₂ m) of a is 6/5 or more is preferable, or more than 7/5 desirable. Moreover, 3/1 or less is preferable and, as for the said ratio (m ₆₁ / m ₆₂ ), 2/1 or less is more preferable.

Moreover, from the same viewpoint, the ratio (n ₆₃ / n ₆ ) of the area n ₆₃ of the area | region seen from the plane of the contact part 61 in the area n ₆ of the skin contacting surface side of the sublayer ₆ is n , 1/20 or more is preferable and 1/10 or more is more preferable. Moreover, 2/5 or less are preferable and, as for the said ratio (n ₆₃ / n ₆ ), 1/5 or less is more preferable. The area n ₆₃ of the area seen from this plane is the area area when the sublayer 6 is viewed in plan from the skin-contacting surface side without considering the recessed wall surface or the like in the thickness direction.

(Differential method of the close part 61 and the grandfather 62)

The tight part 61 and the rough part 62 of a sublayer are difficult to discriminate clearly the boundary of a density normally. Therefore, it can be distinguished from the rough part 62 by making into the part which becomes the recessed part, or making into the part which contact | connects the back surface convex part 8 in the back part 61.

More specifically, the cross section of the sublayer 6 passing through the neighboring contact portion 61 of the sublayer is enlarged, and the curve of the skin side surface of the sublayer 6 is a curve recessed on the non-skin contact surface side. It is to be a part inserted into a curved and rounded area. The cross section of the skin-side surface of the sublayer has a concave-convex shape in which a curve recessed on the non-skin-contacting surface side and a curve protruding on the skin-contacting surface side are continuously repeated. The direction of curvature changes through the area | region which becomes substantially straight in the boundary of this recessed part and protrusion part. The recessed portion surrounded by the boundary where the straight line is curved and starts to round is referred to as the depression.

(Measurement Method of Density of Sublayer 6)

Magnification observation (adjusted by the magnification which can measure 30-60 fiber cross sections; 150 times or more and 500 times or less) using the following scanning electron microscope, and counts the number of the cross sections of the fiber cut | disconnected by the said cut surface per fixed area. It was. Next, it converted into the number of cross sections of fiber per 1 mm <2>, and made this fiber density (piece / mm <2>). The measurement was performed at three points and averaged to make the fiber density of the sample.

Scanning electron microscope; JCM-5100 (brand name) manufactured by Nippon Electronics Co., Ltd.

In addition, the skin contacting surface side of the surface sheet 1 is the surface convex part 78 according to the ups and downs of the back surface recessed part 7 and the back surface convex part 8 as demonstrated with reference to FIG. 4 in 1st Embodiment. ) And the concave-convex shape in which the surface recesses 88 are repeated. It is preferable that the uneven | corrugated shape which integrated this front and back is arrange | positioned in the plane direction, and the repetition of an unevenness | corrugation is formed in the multi-direction as the whole surface sheet 1 (refer FIG. 4). By the shape of this surface sheet 1, not only the contact area with the sublayer 6 can be reduced, but also the contact area of the wearer's skin and the surface sheet 1 can also be reduced. The reduction of the contact area is more effective in suppressing the wetting of the skin, and also improves the air permeability in the uneven portion, so it is more effective in preventing water cracking. In addition, if the surface sheet 1 is uneven | corrugated in both surfaces, the three-dimensional cushioning property which follows a three-dimensional movement well and is supported by a dot in both surfaces will be expressed. If the top surface 78a of the surface convex part 78 is a rounded curved shape, a soft touch will be acquired with this cushioning property.

In addition, in the uneven shape of the surface sheet 1, as shown in FIG. 4, the side wall surface 88b (= 78b) of the downhill inclination toward the surface recessed part 88 from the surface convex part 78 is formed, It is preferable that the surface recesses 88 be in the form of independent triggers or cups. This makes the collection of excretion liquid and the improvement of liquid absorption performance more effective. For example, the excretion liquid is lowered from the side wall portion 78b (= 88b) than the top portion 78a of the surface convex portion 78 (arrow b ₁ ) and is set near the top portion 88a of the surface recess portion 88. It is easy to move, and it becomes difficult to move in a plane direction. Thereby, the diffusivity of the excretion liquid on the skin contacting surface side of the surface sheet 1 can be further suppressed, and the excretion liquid can be moved to a position far from skin in the thickness direction.

In this case, as shown in FIG. 28, the excretion liquid moved to the surface recessed part 88 is a recessed space part (from the side wall part 88b (side wall part 7b of = recessed part 7)). 72w)) (arrow b ₂ ). Then, the liquid diffuses from the recess space portion 72w in the planar direction (arrow b ₃ ), is led to the absorbent core 31 (arrow b ₄ ), and is fixed. And the liquid which accumulated a lot in the surface recessed part 88 does not fully permeate | transmit in the part, and liquid retention tends to generate | occur | produce.

However, since the non-skinned surface side is in contact with the contact portion 63 of the sublayer 6 as the rear surface convex portion 8, the attracting force and absorber of the stronger sublayer 6 The suction force of (3) together can effectively eliminate the liquid residue (arrow b ₅ ). Thus, the uneven | corrugated shape of the surface convex part 78 and the surface recessed part 88 can make the effect | action by the back surface convex part 8, the back recessed part 7, and the sublayer 6 more effective.

As described with reference to FIG. 6 in 1st Embodiment, the non-skin-contacting surface side of the surface sheet 1 is individual back surface convex part 8 surrounded by the some back surface recessed part 7, and mutually mutually in the plane direction. It is preferable that it becomes independent arrangement | positioning, and the space of the individual back surface recesses 7 is mutually connected in a plane direction. As a result, the excretion liquid drawn into the recess space portion 72w can more freely diffuse the props of the rear surface recess 7 as shown by the white arrows shown in FIGS. In a wider aspect, the excretion liquid can be efficiently absorbed and held and immobilized.

In the absorption process of the liquid shown to FIG. 27 or FIG. 28 of the diaper 30, the density difference which the fiber density of the nonwoven fabric of the surface sheet 1 in a back recessed part becomes from the top part 7a to the bottom part 7c, or It is desirable to have a density gradient. In this way, the liquid can be quickly penetrated from the skin-contacting surface side and the liquid can be drawn in more strongly. This density difference and density gradient concave, for example, when the surface sheet 1 which extends from the top part 7a to the bottom part 7c in the predetermined cross section of the back surface recessed part 7 shown to FIG. 26A (2). unit can be represented by comparing the average of the thirds (a unit, B unit, C unit) to, and each fiber density (n _1, n _2, n ₃₎ in their height (h ₁₎ of (7) . A portion, B portion, the fiber density portion is _{C, (n 1) <(n} 2) <(n 3) are preferred, and a ratio _{(n 1 / n 2 / n} 3) is, at least 2/6/10 This is preferable and 3/5/10 or more is more preferable. Further, the ratio _{(n 1 / n 2 / n} 3) is, is 8/9/10 below are preferred, and more preferably less than 5/7/10. By setting it as the said minimum, the favorable touch can be ensured, and by using below the said upper limit, the liquid residual of the surface sheet 1 can be reduced.

(Measuring method of density of surface sheet 1 in back surface recessed part 7)

Density (n ₁ , n ₂ , n ₃ ) of the top portion 7a, the side wall portion 7b, and the bottom portion 7c of the surface sheet 1 in the above-described backside recessed portion 7 is determined in the following method. It can be measured by.

Based on the depth h ₁ in the back recessed part 7, each part which divided the part of the surface sheet 1 from the front part 7a to the bottom part 7b into A part, B part, and C part, The enlarged observation of the cut surface which passes the top part 7a and the bottom part 7b of a surface sheet using the following scanning electron microscope (adjustment by the magnification which can measure 30-60 fiber cross sections; 150 times or more and 500 times or less) The number of cross sections of the fiber cut by the cut surface per fixed area was counted. Next, it converted into the number of cross sections of fiber per 1 mm <2>, and made this fiber density (piece / mm <2>). The measurement was performed at three points and averaged to make the fiber density of the sample.

Scanning electron microscope; JCM-5100 (brand name) manufactured by Nippon Electronics Co., Ltd.

(Variation of Cross-sectional Shape of Surface Sheet)

In the diaper 30, the cross-sectional shape of the surface sheet 1 is not limited to the concave-convex shape of the third embodiment, and the back convex portion 8 and the back concave portion 7 and sublayers 6 below it. The arrangement can be any shape as long as it enables the arrangement relationship of For example, as shown in FIG. 29, the shape (a) with which the skin contacting surface side is flat, the shape (b) with which the top part of the back surface convex part 8 is flat, etc. are mentioned. In the case of the shape like FIG. 29 (b), the bottom part 7c of the back surface recessed part 7 is a plane with the step 8a of the back surface convex part 8, and the side wall part 7b of the back surface recessed part 7b. ) Is the intersection of the surfaces of.

In the modification of these surface sheets 1, the back surface convex part 8 is thicker than the back surface recessed part 7. Therefore, liquid residue tends to occur inside the rear convex portion. However, also in this case, since the rear convex part 8 is in contact with the contact part 61 of the sublayer 6, the attracting force of the stronger sublayer 6 and the suction force of the absorber 3 together, The liquid residue can be effectively eliminated. Moreover, also in this modification, it is preferable that there exists a density difference or density gradient from which the fiber density of the nonwoven fabric of the surface sheet 1 in a back recessed part becomes high from the top part 7a to the bottom part 7c. In this way, the liquid quickly penetrates into the recess space portion 72w from the thin portion of the surface sheet 1, and the sublayer 6 can guide the liquid strongly inside the absorber.

(Modified example of absorber)

Further, in the diaper 30, the shape of the absorbent core constituting the absorbent body is not limited to the flat shape of the skin-contacting side surface of the third embodiment, and the liquid contained therein can be widely diffused, quickly absorbed, held and immobilized. What can be used can be arbitrarily employed. For example, as described with reference to FIG. 10 in the first embodiment, it corresponds to the groove-shaped recess 91, the block-shaped protrusion absorbing portion 93 divided into the recess, and the recess 91. The absorbent core 90 (FIG. 10 (a)), 90a (FIG. 10 (b)) which consists of the recessed absorption part 94 which connects the one surface side of the protrusion absorption part 93, etc. is mentioned. have.

In the case where the absorbent core 90 or 90a is employed, the recessed portion 91 or the recessed portion absorbing portion 94 of the rear surface recessed portion 7 in the crotch portion C including at least the excreted portion corresponding region. It is preferable that the arrangement overlaps with the recess space portion 72w. As a result, the liquid in the recess space portion 72w tends to be easily transferred to the recess 91 or the recess absorber 94, and quickly diffuses and is easily fixed.

(Formation method of back surface recessed part 7, back surface convex part 8, and contact part 63)

The absorbent article which has the back recessed part 7, the back convex part 8, and the contact part 63 as shown in FIG. 26B can be obtained in the normal manufacturing process in this kind of article. For example, in the lamination step of the absorber and the surface sheet in the assembling process of the diaper, the surface sheet 1 is brought into contact with the pressing roll between the pressing roll on which the uneven portion is formed and the anvil roll disposed opposite to the pressing roll. It can be formed by introducing and partially pressing the laminate. However, since this pressurization and heating aim at the formation of the shaping | molding part of the surface sheet 1 and the contact part 63, it is not as strong as film-forming like crimping between sheets. 0.2 MPa or more is preferable and, as for pressurization conditions in this case, 0.3 MPa or more is more preferable. Moreover, 0.8 MPa or less is preferable and, as for the said pressurization, 0.6 MPa or less is more preferable. Moreover, when superheating is performed with pressurization, the heating temperature is more than normal temperature, and 40 degreeC or more is more preferable. Moreover, 100 degrees C or less is preferable, and, as for the said heating temperature, 80 degrees C or less is more preferable.

Moreover, when forming a back surface recessed part with the said press roll, when using the shaping | molding sheet which has the uneven | corrugated shape as shown in FIG. 4 or the uneven | corrugated shape as shown in FIG. 29 previously, the sublayer in the back surface convex part 8 ( 6) Formation of the contact portion 63 with the contact becomes more reliable, and at that time, a high density in which the portion of the sublayer 6 in the contact portion 63 is recessed into a concave shape can be formed. desirable.

Manufacture of the said shaping sheet can be implemented by the method demonstrated in 1st Embodiment.

As a formation material of the surface sheet 1, the sublayer 6, the back sheet 2, the absorber 3, and the side sheet 4, what is normally used for an absorbent article can be used. Specifically, the raw material etc. which were illustrated in 1st Embodiment are mentioned.

Moreover, as the sublayer 6, it is preferable to use a nonwoven fabric or a bulky pulp sheet, considering the point which can exhibit the function of the diffusion and permeation | transmission of the above-mentioned liquid, for example. Specific examples of the nonwoven fabric include air through nonwoven fabric, span lace nonwoven fabric, span bond nonwoven fabric, and meltblown nonwoven fabric. When these nonwoven fabrics are comprised of hydrophobic fibers, it is preferable to hydrophilize them using a hydrophilizing agent. 20 g / m <2> or more is preferable and, as for the basis weight of the sublayer 5, 30 g / m <2> or more is more preferable. Moreover, 100 g / m <2> or less is preferable and, as for the said basis weight, 80 g / m <2> or less is more preferable.

The absorbent article of the present invention further improves the absorbent performance of a conventional absorbent article, and further reduces the residual liquid on the surface of the skin, which may occur depending on the state of use, the amount of excretion, etc., along with the return of the liquid and the suppression of humidity inside the article. It has an excellent effect of reducing the burden on the skin.

In the absorbent article of the present invention, the absorbent body is not limited to the above-described embodiment as long as it has a function of absorbing and retaining the liquid therein and fixing the liquid. The absorbent article may be, for example, a sheet-like thin film. In the absorbent article of the present invention, the sublayer is not limited to the above-described embodiment as long as it has a function of covering at least the skin-facing surface side of the absorber and leading the liquid to the absorber, and is not limited to a single layer, but a plurality of layers. It may be.

The absorbent article of the present invention is not limited to the deployment type disposable diaper of the above embodiment, but includes one having the above-described relationship between the surface sheet, the sublayer, and the absorber. For example, when a part is broken as a pants type disposable diaper or a pants type disposable diaper, it may be a diaper which can be used as a tape type, and may be a urine pad, a sanitary napkin, a panty liner, or a light incontinence pad. In addition, the absorbent article of the present invention is not only limited to acupuncture points, but is also effective for urine, crayfish, and stool. Moreover, the absorbent article of this invention may also include another member suitably according to a use and a function in the thing of 3rd Embodiment.

Regarding the embodiment described above, the present invention further discloses the following absorbent articles.

An absorbent article having a liquid permeable surface sheet disposed on the <1> skin-contacting surface side, a back sheet disposed on the non-skin-contacting surface side, and absorbers interposed between the sheets,

The surface sheet is made of a nonwoven fabric, the absorbent body has an absorbent core and a covering sheet covering the same,

On the non-skin-contacting surface side of the surface sheet, a plurality of backside recesses recessed to the skin-contacting surface side are arranged and dispersed adjacently, and the covering sheet is indented into the backside recessed portion, and the covering sheet and the absorbent core that have entered the recessed surface. An absorbent article having a space portion therebetween.

The non-skin-contacting surface side of the <2> above-mentioned surface sheet is an absorbent article as described in said <1> by which the uneven | corrugated shape is formed by the periodic arrangement of the said back surface recessed part.

The absorbent article as described in said <1> or <2> whose skin contact surface side of a <3> said surface sheet is an uneven | corrugated shape.

The absorbent article as described in any one of said <1> to <3> whose surface contact surface side of a <4> said absorbent core is flat shape.

The absorbent as described in any one of said <1>-<4> whose depth of the entry part which a part of the said coating sheet | seats enters into the <5> said back recessed part is shallower than the depth of the recessed part of the said back recessed part 7. article.

The absorbent article in any one of said <1> to <5> whose indentation depth of the said coating sheet in the said back recessed part of <6> said surface sheet is 50% or more of the depth of the recessed part of the said back recessed part. .

<7> It is preferable that the number of things which the depth which the said coating sheet in the said back recessed part of the said front surface sheet has become 50% or more of the depth of the recessed part of the said back recessed part among all the <7> said back recessed parts is 50% or more. The absorbent article according to any one of <1> to <6>, further preferably 70% or more.

The absorbent article according to any one of <1> to <7>, in the <8> above-mentioned back recessed part, in which a clearance part exists between the said surface sheet and the non-tipped part of the said coating sheet.

The absorbent article as described in any one of said <1> to <8> in which the <9> said back recessed part has the part to which the said coating sheet and the said surface sheet are bonded.

<10> The said back recessed part is a recessed part of the non-skin-contacting side surface of the said surface sheet, and is any one of said <1> to <9> which is formed by the side wall part which goes to the bottom from the part which the surface sheet which along this recessed part forms. The absorbent article according to claim 1.

<11> The said back recessed part becomes a shape similar to the parabola in the cross-sectional shape of the back recessed part 7 which the said side wall part forms, and the space shape of the back recessed part is a shape similar to the cone or cone which has roundness in the said government part. The absorbent article as described in said <10>.

The absorbent article as described in said <10> or <11> in which the junction part which abuts and joins the side wall part in a <12> said back recessed part, and is joined.

The absorbent article as described in said <12> in which the <13> above-mentioned bonding part carries out the adhesive bonding of the fiber of the said coating sheet and the said surface sheet by spray-coating an adhesive agent.

On the non-skin-contacting surface side of the <14> above-mentioned surface sheet, a plurality of back surface concave portions and a plurality of back surface convex portions are disposed, and each of the back convex portions is surrounded by a plurality of the back concave portions and arranged independently from each other. The absorbent article in any one of said <1>-<13> in which the back recessed part is connected with each other in the space.

The <15> said back recessed part has a top part, a side wall part, and a bottom part which consist of a surface sheet, and there exists a density difference or density gradient of the nonwoven fabric fiber of the surface sheet which rises toward the bottom part from the said <1>-<14>. The absorbent article according to any one of claims.

The <16> above-mentioned absorbent core has a dense structure of fiber density, The absorbent article in any one of said <1> to <15> which has the coarse part of the density of this absorbent core, and the overlapping part of the said space part. .

The absorbent article as described in any one of said <1> to <16> to which the <17> said coating sheet and the said absorbent core are intermittently joined by a hot melt adhesive.

The absorbent article in any one of <1>-<17> in which a fiber density becomes large from the skin surface side to a non-skin surface side in the cross section of a <18> said back surface recessed part.

<19> The said absorbent article has the end laminated part by which the said front sheet and the said back sheet were laminated | stacked directly or indirectly and bonded together without the absorber outside the longitudinal end of the said absorber,

The end stacking portion has a plurality of integral deformation portions in which opposing surfaces of the front sheet and the back sheet are integrally deformed in a convex shape in a thickness direction, and the plurality of deformation portions are distributed in a plane direction of the end stacking portion. The absorbent article as described in any one of <1>-<18>.

Opposite surfaces of the front sheet and the back sheet in the <20> end laminate part are in the <19> having a meandering shape in the thickness direction by deformation formed by the integral deformation part as viewed in a longitudinal section. The absorbent article described.

On the non-skin-contacting surface side of the <21> above-mentioned surface sheet, a plurality of back recesses recessed in the skin-contacting surface side are formed and distributed adjacently, and the said back sheet in the said back recessed part in the said edge part laminated part The absorbent article as described in said <19> or <20> which folds in and forms the said integral deformation part.

The absorbent article as described in said <21> whose said back recessed part in a <22> said edge part laminated part is a recessed part of a substantially cylindrical shape.

The <23> above-mentioned surface sheet is an absorbent article in any one of said <19> to <22> which consists of a nonwoven fabric which has a concavo-convex shape on both surfaces.

The absorbent article as described in any one of said <19> to <23> in which the elastic member is arrange | positioned in the width direction between the said front sheet and the said back sheet in a <24> said edge part laminated part.

The absorbent article according to any one of <19> to <24>, in which the sheet made of a nonwoven fabric is interposed between the front sheet and the back sheet in the <25> end stacking portion.

Any of the above <19> to <25>, wherein the depth of the ridge where the portion of the back sheet is squeezed into the rear dent is shallower than the depth of the depression of the back dent in the <26> end edge part. The absorbent article according to claim 1.

The absorbent article as described in said <26> whose depth which the said back recessed part in the <27> said edge part laminated part penetrated is 0.4 mm or more and 4 mm or less.

The <28> non-skin-contacting surface side of the said surface sheet is concave-convex by the back convex part, and a liquid permeable sublayer is arrange | positioned between the surface sheet and the said absorber, and the sublayer and the said surface sheet The convex part is in contact with the back part,

The absorbent article in any one of said <1> to <27> in which the fiber density of the said sublayer in the said contact part is higher than the other part of this sublayer.

The peripheral part of the said back convex part in the non-skin-contacting surface side of the <29> said surface sheet forms the back-side recessed part recessed from the non-skin-contacting surface side to the skin-contacting surface side, and the back recess and the sublayer The recessed part space part is formed in between, and the absorbent article as described in said <28> whose fiber density of the said sublayer in the position of the recessed part space part is lower than the fiber density of the said sublayer which contact | connects the said back convex part. .

The absorbent article as described in said <28> or <29> which is a fiber structure in which the clearance gap between the fiber of both members is maintained in the contact part of the said back convex part of the <30> said surface sheet and the said sublayer.

The absorbent article as described in any one of said <28> to <30> in which the back surface convex part of the <31> above-mentioned surface sheet and the contact part of the said sublayer are mixed and what is non-adhesive.

<32> In the contact portion between the back convex portion of the surface sheet and the sublayer, the sublayer forms a concave recessed toward the non-skin contact surface, and the convex back surface of the surface sheet in the concave portion of the sublayer. The absorbent article as described in any one of said <28>-<31> which an addition non-tipped and contact | connects.

The ratio of the area area of the contact part with the back surface convex part with respect to the sheet area of the <33> said sublayer is 1/20 or more and 2/5 or less, The water absorbency in any one of said <28>-<32>. article.

The fiber density of the sublayer in the contact part with the back convex part of the <34> said surface sheet is 15 pieces / mm <2> or more and 120 pieces / mm <2> or any one of said <28>-<33>. Absorbent articles.

The <35> above-mentioned sublayer is an absorptive article in any one of said <28>-<34> which consists of an air through nonwoven fabric.

In <36> said sublayer, the thickness of the contact part with a high fiber density of the said contact part is 30% or more and 90% or less in said <28>-<35> with respect to the thickness of the rough part whose fiber density is lower than this. The absorbent article according to any one of claims.

The absorbent article as described in any one of <28>-<36> which has a density difference or density gradient from which the fiber density of the nonwoven fabric of the said surface sheet in a <37> said back surface recessed part rises from the top to the bottom.

The <38> above-mentioned surface sheet is an absorbent article in any one of said <1> to <37> which consists of a hydrophilic nonwoven fabric.

The <39> said back sheet is an absorptive article in any one of said <1> to <38> which consists of a porous film which is waterproof, moisture permeable, and breathable.

The absorbent article as described in any one of said <1> to <39> in which a <40> said absorbent core is comprised from pulp fiber and a superabsorbent polymer.

The <41> above-mentioned covering sheet is an absorbent article in any one of said <1> to <40> which consists of a hydrophilic thin paper.

The absorbent article as described in any one of said <1> to <41> whose <42> absorbent article is a deployment type disposable diaper.

The absorbent article as described in any one of said <1> to <41> whose <43> absorbent article is a pants type disposable diaper.

The absorbent article as described in any one of said <1> to <41> which is a diaper which can be used as a tape type when a <44> absorbent article breaks a part as a pants type disposable diaper.

Example

EMBODIMENT OF THE INVENTION Below, although this invention is demonstrated in detail based on an Example, this invention is limited and interpreted by this.

About 1st Embodiment, the following Examples 1 and 2 and Comparative Examples 1 and 2 are shown.

[Example 1]

In the web shaping device, a web of a sheath-type composite fiber whose core is polyethylene terephthalate and a sheath is polyethylene is fixed, and hot air is blown onto the fiber web on the pedestal to shape the fiber web along the projection on the pedestal, by welding the respective fibers table of front and rear surfaces both shown in irregularities Figure 4, (if the pitch (w ₁₎ between the recess government (7a-7a) is a 5 mm depression depth of (h ₁₎ 2 mm) shape-mounted sheet Was formed and used as a surface sheet. A non-liquid backing sheet and an absorbent core (pulp basis weight 200 g / m 2, superabsorbent polymer basis weight 286 g / m 2) were laminated in the order of an absorber coated with a hydrophilic resin and a surface sheet, and each was bonded with a hot melt. The back seat | sheet, absorber shape, and structure were made the same as a commercially available diaper "Mary's Sarasara air through M size" (brand name) by Kao Corporation of a control. At this time, the adhesive coating density (q ₁ ) between the surface sheet and the coating sheet was 15 g / m 2, and the coating density (q ₂ ) of the hot melt adhesive between the coating sheet and the absorbent core was 5 g / m 2. This laminated sample was sealed with the diaper product pack pressure equivalent, and stored at room temperature for 1 month, and the entrance part of the coating sheet was formed.

The depth h ₁ of the rear surface recess was 1.5 mm on average. In addition, the indented depth (h ₂ ) of the entry part was 1.3 mm on average. The ratio of the back recessed portion in which (h ₂ ) / (h ₁ ) became 50% or more was 95%. In _{addition, (h 2) / (h} 1) is a ratio of what is entering the recess of the squeeze, fully (100%) that is at least 50%, 60%.

[Example 2]

The laminated sample of Example 1 was sealed with the diaper product pack pressure equivalent, and the sample stored in room temperature for 3 days was used as the sample of Example 2.

(1) The depth h _{1 of the back} recessed portion was 2.0 mm on average.

(2) In addition, the indented depth h _{2 of the} entry part was 0.8 mm on average.

(3) The ratio of the back recessed portion in which (h ₂ ) / (h ₁ ) became 50% or more was 30%.

_{(4) (h 2) /} (h 1) is a ratio of what is entering the recess of the squeeze, fully (100%) that is at least 50% is of 5%.

[Comparative Example 1]

A commercial disposable diaper (trade name "Mary's Sara Sara Air Through M size") manufactured by Kao Corporation and a handmade product containing only the sublayer in the amount of the company were used as samples of Comparative Example 1.

[Comparative Example 2]

A flat, air-through nonwoven fabric made of a sheath type composite fiber whose core is polyethylene terephthalate and cis is polyethylene is used as a surface sheet, and a non-liquid backing sheet and an absorbent core (pulp basis weight 200 g / m 2, similarly to Examples 1 and 2). The superabsorbent polymer basis weight 286 g / m 2) was laminated in the order of an absorber coated with a hydrophilic resin and a surface sheet, and each was bonded with a hot melt. Only the pedestal of the apparatus for shaping the above-described fiber web is taken out, and the pedestal protrusion is placed on the sample surface sheet so as to be in contact with the surface sheet side and pressed to stand for one month, thereby forming the uneven shape of the surface sheet and the absorber body. It was set as the sample of the comparative example 2.

[Performance evaluation]

About the sample (disposable diaper) of an Example and a comparative example, the liquid-diffusion area in each layer of a surface sheet, a coating sheet, and an absorbent core was measured. As a measurement test, it implemented by two types of tests of following (1) and (2). The liquid diffusion in the absorbent core is a diffusion region of red artificial urine obtained by passing through a projection apparatus under a sample and irradiating light.

(Test 1)

First, for each of the samples of Examples 1 and 2 and Comparative Examples 1 and 2, the absorber width direction center portion at the point of 155 mm in the dorsal end portion in the longitudinal direction from the ventral absorbent end portion of the sample developed in the plane was taken as the liquid injection point. , 40 g of artificial urine was injected at a rate of 5 g / sec using a pump. The composition of artificial urine was 1.94 wt% of urea, 0.795 wt% of sodium chloride, 0.11 wt% of magnesium sulfate, 0.062 wt% of calcium chloride, 0.197 wt% of potassium sulfate, 0.010 wt% of red No. 2 (dye), 96.88 wt% of water and polyoxy It is ethylene lauryl ether (about 0.07%), and surface tension is adjusted to 53 +/- 1 dyne / cm (23 degreeC). After standing for 10 minutes, the surface sheet was peeled off and photographed, and the diffusion area of artificial urine was simulated on the OHP sheet. The absorber upper covering sheet after peeling the surface sheet was similarly photographed, and the diffusion area of artificial urine was simulated on the OHP sheet. The diffused area | region of the artificial urine obtained by placing a sample on the projection stand and irradiating light from the back sheet side was simulated on the OHP sheet. The image of the OHP sheet was input to a scanner, and the diffusion area was calculated using image analysis software Image-Pro Plus (manufactured by Nippon Loafers).

(Test 2)

For each of the samples of Example 1 and Comparative Example 1, the absorber width direction center portion at the point of 155 mm from the ventral absorber end of the sample developed in the plane to the dorsal end in the longitudinal direction was used as the liquid injection point, and 40 g of artificial urine was injected at a rate of 5 g / sec. After standing for 10 minutes, photographs were taken from the top, and 40 g of artificial urine was injected at a rate of 5 g / sec from the same injection point. After standing still for 10 minutes, the diffusion area was analyzed in the same manner as in Test 1. In test 2, the analysis of the diffusion area after 40 g injection is impossible. In the test 2, the artificial urine diffusion | diffusion state on the surface sheet by the 1st artificial urine injection was the same as the copper sample of the test 1 by the photographic image photographed before the 2nd artificial urine injection.

The above evaluation results are shown in Tables 1 and 2 below. 11 and 12 show the diffusion range of the liquid of the sample used in the liquid diffusion test. Table 1 and FIG. 11 show the measurement result of said (test 1), and Table 2 and FIG. 12 show the measurement result of said (test 2). The values of the 40 g infusion in Table 2 and FIG. 12 are listed for comparison of the respective values of Example 1 and Comparative Example 1 conducted in Test 1. 11 and 12, the diffusion range of the liquid of the surface sheet is shown as a portion in which black circles are added to the photographed surrogate photograph, and the liquid diffusion range of the covering sheet and the absorbent core is shown as a portion enclosed by black lines. The change of the liquid diffusion area between each layer in each sample shown in FIGS. 11 and 12 and the difference of the area between Examples 1 and 2 and Comparative Examples 1 and 2 correspond to the measurement results in Tables 1 and 2. .

As is clear from the results shown in Table 1 and FIG. 11, the disposable diapers of Examples 1 and 2 suppressed the diffusion of the liquid in the surface sheet as compared with Comparative Example 1, and on the other hand, the coated sheet and the absorbent core and In the internal structure under the same surface sheet, liquid diffusion is sufficiently performed without comparable with the comparative example. As is clear from the results shown in Table 2 and FIG. 12, the disposable diaper of Example 1 has a liquid diffusion area in the surface sheet in two liquid injections in Test 2 and only one liquid injection in Test 1. Was substantially suppressed to the same extent. In addition, despite the suppression of liquid diffusion of the surface sheet, the disposable diaper of Example 1 was sufficiently diffused in the absorber according to the accumulated amount of the liquid. On the other hand, in the comparative example, the liquid-diffusion area of the surface sheet after 2 liquid injections in the test 2 was set to about twice the area of the injection | pouring of the liquid only 1 time in the test 1. As shown in FIG.

From the above, the disposable diaper of the embodiment can quickly absorb the liquid, diffuse it into the absorber and efficiently absorb and hold it, while suppressing the diffusion of the liquid from the surface sheet regardless of the refreshment of the liquid amount such as repeated excretion. As a result, it has been found to exhibit an excellent effect of suppressing the wetting of the skin, leading to a good fit.

About 2nd Embodiment, the following Example 21 and Comparative Examples 21-23 are shown.

[Example 21]

In the web shaping device, a web of a sheath-type composite fiber whose core is polyethylene terephthalate and a sheath is polyethylene is fixed, and hot air is blown onto the fiber web on the pedestal to shape the fiber web along the projection on the pedestal, By fusing each fiber, both front and back surfaces are concave-convex (the pitch w ₁ between the top portions 7a-7a of the concave portion 7w at the end portion and the depth h ₁ 1.3mm at the concave portion 7w at the end portion). The shaping | molding shaping sheet of the shape shown in FIG. 4 was formed, and it was set as the surface sheet.

The surface sheet of the diaper "Mary's Sarasara air through M size" (brand name) by a Kao Corporation was changed and bonded by the surface sheet obtained at the said process. In addition, the part of the vicinity of the edge part where the absorber of the back side and the abdomen of the said diaper is not arrange | positioned was made into the laminated structure of the said front sheet, a back sheet, and an outer layer nonwoven fabric. Next, the part near the end part in which the absorber of the said back side and the abdomen of the said diaper is not arrange | positioned is pushed through between a press roll and anvil roll, and has an integral skin side deformation | transformation part and an integral non-skin side deformation | transformation part, FIG. The edge laminated part shown in FIG. 15 was formed and it was set as the test body 1A of Example 21. FIG.

In the end stacking portion, if the end portion of the topsheet depth of the recess (7w) (h ₁₎ was the average 1.0 mm. In addition, the depth h ₄ of the raised portion of the raised sheet was 0.8 mm on average. _{(h 4) / (h 1} ) This was back end that is at least 50% proportion of the recess (7w) is 90%. In _{addition, (h 4) / (h} 1) This was back end that is at least 50% of the proportion of which squeeze into the recess (7w), complete (100%) is 50%.

Next, about the back side part of the said diaper test body 1A, it cut | disconnected in the longitudinal direction 40 mm and the width direction 70 mm from the diaper end side, and made this the test body 1B of Example 21. Moreover, about the back side part of the said diaper test body 1A, it cut into 45 mm of longitudinal directions and 130 mm of width directions from the diaper end side separately from the test body 1B, and made this the test body 1C of Example 21. The cross-sectional shapes of the test bodies 1B and 1C are concave-convex structures as modeled and shown in Fig. 23A.

[Comparative Example 21]

In the test body 1A of Example 21, the test body of the diaper which obtained the back surface sheet flat without providing the integral skin side deformation | transformation part and the integral non-skin side deformation | transformation part by pressurization was obtained. In the end stacking portion, if the end portion of the topsheet depth of the recess (7w) (h ₁₎ was the average 1.0 mm. In addition, the depth h ₄ of the raised portion of the raised sheet was 0 mm on average. This was taken as the test body 11A of the comparative example 21. Moreover, about the back side part of the test body 11A, it cut | disconnected in the longitudinal direction 40 mm and the width direction 70 mm from the diaper end side, and made this the test body 11B of the comparative example 21. Moreover, about the back side part of the test body 11A, it cut into 45 mm of longitudinal directions and 130 mm of width directions from the diaper end side separately from the test body 11B, and made this the test body 11C of the comparative example 21. The cross-sectional shapes of the test bodies 11B and 11C are concave-convex structures as modeled and shown in Fig. 23B.

[Comparative Example 22]

It is partially changed to a commercially available disposable diaper manufactured by Cao Corporation (trade name "Mary's Sarasara Air Through M size"), and the elastic body and the barrier nonwoven fabric which are arrange | positioned outside the longitudinal direction back end of the absorber with a commercial item are not arrange | positioned, The handmade product which directly bonded the front sheet and the back sheet was set as test body 12A of Comparative Example 22. In the end stacking portion, the depth (h ₁₎ of the second floor surface recess (7w) if the end portion of the upper layer of the sheet was the average 0.4 mm. In addition, the depth h ₄ of the raised portion of the raised sheet was 0 mm. Moreover, about the back side part of the test body 12A, it cut | disconnected in the longitudinal direction 40 mm and the width direction 70 mm from the diaper end side, and made this the test body 12B of the comparative example 22. Moreover, about the back side part of the test body 12A, it cut | disconnected to the longitudinal direction 45 mm and the width direction 130 mm from the diaper end side separately from the test body 12B, and made this the test body 12C of the comparative example 22. The cross-sectional shapes of the test bodies 12B and 12C are concave-convex structures as modeled and shown in Fig. 23C. In addition, the surface sheet of this test body is a two-layer structure of the upper layer with an unevenness | corrugation, and a flat lower layer, and was shown as upper layer 11 and lower layer 12 in the model figure in FIG.

[Comparative Example 23]

In the test body 11A of the comparative example 21, the test body of the diaper which changed the surface sheet into the flat without unevenness was obtained. This was set as the test body 13A of the comparative example 23. In this edge part laminated part, since the back surface of the surface sheet did not have a recessed part, the depth h _{1 of the} recessed part, and the depth h ₄ which penetrated into the raised part of the back sheet were 0 mm. Moreover, about the back side part of the test body 13A, it cut | disconnected in the longitudinal direction 40 mm and the width direction 70 mm from the diaper end side, and made this the test body 13B of the comparative example 23. Moreover, about the back side part of the test body 13A, it cut | disconnected to the longitudinal direction 45 mm and the width direction 130 mm from the diaper end side separately from the test body 13B, and made this the test body 13C of the comparative example 23. The cross-sectional shapes of the test bodies 13B and 13C are the structures as modeled and shown in Fig. 23 (d).

[evaluation]

About each disposable diaper test body manufactured above, liquid flow property and elasticity were evaluated with the following method. The results are shown in Table 3.

[Method of Liquid Flow Test]

An acrylic plate was used to create an inclined surface at any angle. With the acryl plate being in a horizontal state, the test bodies 1B and 11B to 13B were placed and fixed thereon so that the surface sheet became upper. Next, from the part corresponding to the longitudinal direction edge part (end part 20a of the diaper 20 of FIG. 13) of the diaper in the back side part before cutting with respect to the test body 1B and 11B-13B in a horizontal state with an acryl plate. 500 μl of red artificial urine was added dropwise at a rate of 100 μl / s to the 30 mm away portion. Then, it left still for 1 minute, the diffusion distance at this time was measured, and the outline of liquid diffusion was simulated on the transparent OHP sheet. The diffusion distance represents the moving distance of the liquid from the dropping point to the end (slope side).

Next, the acrylic plate was allowed to stand for 3 minutes while tilting at 30 ° so that a substantial portion of the back side end (end 20a of diaper 20 in FIG. 13) was downward. The diffusion distance at this point was measured again, and the contour of liquid diffusion was simulated on a transparent OHP sheet. The diffusion area input the image of the OHP sheet into the scanner, and calculated it using image analysis software Image-Pro Plus (made by Nippon Loafers). The difference between the diffusion distance and the diffusion area after the dropping and the slope, respectively, was the flow distance and the flow area, respectively.

The said measurement was performed 6 times each, and the average value was shown in following Table 3 as an evaluation result of a liquid flow test. Moreover, the state of the diffusion of the liquid after dripping of each test body and after inclination was shown in the substitute photograph of FIG. Fig. 24 is a photograph of each test body from the surface sheet side. The range of the diffusion of the liquid is a region shown as a color of low brightness such as black to gray with respect to the white sheet surface sheet.

The diffusion area and the diffusion distance are red diffusion areas of artificial urine obtained by transmitting a projection apparatus under a sample and irradiating light. In addition, the diffusion distance is the length from the dropping center point to the tip where the artificial urine flows to the dorsal end 20a. The composition of the artificial urine used was 1.94 mass% of urea, 0.795 mass% of sodium chloride, 0.11 mass% of magnesium sulfate, 0.062 mass% of calcium chloride, 0.197 mass% of potassium sulfate, 0.010 mass% of red No. 2 (dye), water 96.88 mass%, and poly Oxyethylene lauryl ether EO addition mole number is 41 (about 0.07%), and surface tension is adjusted to 53 +/- 1 dyne / cm (23 degreeC).

[Method of elasticity test]

For the specimens 1C and 11C to 13C, the end portion in the direction corresponding to the diaper width direction (X direction) before cutting was fixed to the chucks at both ends of the autograph (manufactured by Shimadzu Corporation: trade name AG-X 1KN), and 70 mm between chucks were added. I made it possible. Tensile to a stress of 6 N at a rate of 300 mm / min, the operation of returning to the origin was repeated five cycles. The amount of elongation corresponding to each of the stresses of 1, 2, 3, and 4 N during the deceleration (when the load is stretched) and the return (at the time of decompression) in the first cycle is measured, and The difference was recorded as "the variance difference of the sense and return of the 1st cycle". In addition, the amount of extension of the persimmons in the 1st cycle and the 5th cycle corresponding to each stress was measured, and the difference between the two cycles was recorded as the "displacement amount difference of the persimmons in the 1st cycle and the 5th cycle". The small "variation in difference between the perception and return of the first cycle" indicates that the diaphragm of the end laminated portion of the diaper at the time of elongation and contraction is small, and the recoverability is good. Therefore, when the diaper is first stretched and worn around the torso, there is little looseness, indicating that good fit is obtained. The small difference in the displacement amount of persimmon between the first cycle and the fifth cycle indicates that the elastic responsiveness is good even in repetitive stretching. Therefore, even if a change occurs at the same level due to movement of the wearer after the diaper is attached, it indicates that good fit is obtained.

The evaluation result of "the variable difference of the perception and return of 1st cycle" is shown in following Table 4, and the "displacement amount difference of persimmon of the 1st cycle and 5th cycle" was shown in Table 5.

As is apparent from the results of the diffusion distances in Table 3, the test specimens of Example 21 and Comparative Example 21 had a diffusion distance greater than that of Comparative Examples 22 and 23 after dropping (in a state without an external force left horizontally). It was noticeably short and it turned out that liquid is hard to move. In the thing of the comparative example 22, the liquid spread | diffused largely immediately after dripping and reached | attained to the edge part, and leak was generated. The thing of the comparative example 23 also showed that the liquid spread | diffused to the edge part immediately after dripping, and the liquid reached | attained to the edge part, and the leak occurred. Moreover, when the external force after inclination was applied, the test body of Example 21 had small expansion of the liquid diffusion from the dropping state (the state without the external force left horizontally), and the liquid did not reach the edge part, and liquid leakage did not occur. On the other hand, even after dripping, even in the comparative example 21 with comparatively small diffusion, even if it remained in the diffusion to the vicinity of the edge part of the comparative example 23, it reached the edge part and the liquid leaked.

In addition, as is apparent from the results of the diffusion areas in Table 3, the test body of Example 21 had a large resistance to flow, so that it was difficult to diffuse easily, and it was found that the holding force of the liquid was large. On the other hand, in Comparative Example 21, it was found that the diffusion force was easily expanded due to deformation or inclination at the time of applying an external force because the holding force of the liquid in the horizontal state was large but the resistance to flow was small. In addition, in Comparative Examples 22 and 23, since the back sheet was flat, the resistance to liquid diffusion was small and diffused widely after immediately dropping.

This result is also clearly shown in the black or gray low brightness pattern which shows the liquid diffusion in the surrogate photograph of FIG. In the test body 1B of Example 21, the pattern was small and did not reach the end side either in dropping or inclining. On the other hand, in the comparative example 21, although the pattern was small after dripping, the liquid spread | diffused to the end side after the inclination, and in the comparative example 22, the said pattern had reached | attained to the end side already after dripping. In Comparative Example 23, the pattern reached to the vicinity of the end portion. In particular, in Comparative Examples 22 and 23, the pattern was spread widely after dropping.

In addition, as is apparent from the results of Tables 4 and 5, the test specimen of Example 21 had both small "variation differences between the perception and return of the 1st cycle" and "displacement difference between the persimmons of the 1st and 5th cycles". It was comparable to the test body of Comparative Example 21 using the web shaping sheet. From this, it turned out that the test body of Example 21 has a small deformation | transformation of a sheet | seat by elongation, and good elastic responsiveness, without impairing the elastic performance of a web shaping sheet. Therefore, in the diaper having the end laminated part of the structure of the test body, even if there is a change in the abdomen circumference due to a change in the posture of the wearer's body or a meal from the fit state at the time of wearing, the trunk circumferential portion of the diaper is easily followed I found it difficult.

About 3rd Embodiment, the following Example 31 and Comparative Examples 31-33 are shown.

[Example 31]

In the web shaping device, a web of a sheath-type composite fiber whose core is polyethylene terephthalate and a sheath is polyethylene is fixed, and hot air is blown onto the fiber web on the pedestal to shape the fiber web along the projection on the pedestal, By fusing each fiber, the front and back surfaces have a concave-convex shape (a pitch (w ₁ ) of 5 mm between the tops (8a) and (8a) of the rear recesses and a depth (h ₁ ) 2 mm of the rear recesses) of the shape shown in FIG. 4. An excipient sheet was formed and used as a surface sheet. A hydrophilic air through nonwoven fabric having a basis weight of 40 g / m 2 was used as the sublayer. The non-liquid backing sheet and the absorbent core (pulp basis weight 200 g / m 2, superabsorbent polymer basis weight 286 g / m 2) were laminated in the order of an absorber, a sublayer, and a surface sheet coated with a hydrophilic resin, and each was bonded with a hot melt. A hot melt spiral pattern was used for the adhesion between the sublayer and the surface sheet, and the contact portions of the convex portions on the back surface of the sublayer and the surface sheet were adhered and non-adhesive. The laminated sample was sealed with a pack pressure equivalent to that of the diaper "Mary's Sarasara Air Through M Size" (trade name) manufactured by Kao Corporation, and stored at room temperature for one month to form a sublayer uneven structure and a dense structure of fibers.

The ratio (m ₆₁ / m ₆₂ ) of the fiber density (m ₆₁ ) of the milled portion of the sublayer to the fiber density (m ₆₂ ) of the crude portion was 1.65.

[Comparative Example 31]

What was not sealed-storage immediately after manufacture of the laminated sample of Example 31 was made into the sample of the comparative example 31. The sublayer of the sample did not have a concave-convex structure and a dense structure of fibers as in Example 31, and remained flat.

[Comparative example 32]

In the structure of the laminated sample of Example 31, the absorber and the surface sheet were laminated | stacked directly without laminating | stacking a sublayer between an absorber and a surface sheet, and it was set as the sample of the comparative example 32 (without a sublayer) not sealingly preserved. .

[Comparative Example 33]

A commercially available disposable diaper (trade name "Mary's Sarasara Air Through M size") manufactured by Kao Corporation was used as a sample of Comparative Example 33. The sample is a diaper using a two-layered surface sheet having uneven skin side and uneven skin side flattened by heat seal and having a sublayer.

[Performance evaluation]

About the sample (disposable diaper) of an Example and a comparative example, the liquid return amount and absorption time in divided injection under pressure, and the liquid residual amount to a surface sheet were measured. As a measurement test, it implemented by two types of tests of following (1) and (2).

(Test 1)

First, about each sample of Example 31 and Comparative Examples 31-33, the absorber width direction center part of the point which becomes 155 mm from the abdominal absorber end part of the sample which developed in the plane to the back end part in the longitudinal direction was made into the liquid injection point. The acrylic plate on which the cylindrical injection portion was formed was placed on the sample so that the liquid injection point of the sample was in the center of the injection portion, and a weight was further placed on the acrylic plate and a load of 2.0 kPa (20 gf / cm 2) was applied. The injection portion formed in the acrylic plate forms a cylindrical (53 mm high) 36 mm inner diameter, and the central axis of the cylindrical injection portion coincides with the central axis in the width 1/3 direction and a part in the longitudinal direction on the acrylic plate. Then, a through hole having an inner diameter of 36 mm is formed to communicate between the inside of the cylindrical injection portion and the surface sheet opposing surface of the acrylic plate.

40 g of artificial urine was injected while maintaining the liquid height of 10 mm from the injection portion. The time from the start of injection until the artificial urine disappeared from the surface sheet was taken as the absorption time. The composition of artificial urine was 1.94 mass% of urea, 0.795 mass% of sodium chloride, 0.11 mass% of magnesium sulfate, 0.062 mass% of calcium chloride, 0.197 mass% of potassium sulfate, 0.010 mass% of red No. 2 (dye), water 96.88 mass%, and polyoxy Ethylene lauryl ether EO addition mole number 41 (about 0.07%), and surface tension is adjusted to 53 +/- 1 dyne / cm (23 degreeC).

After the injection of artificial urine four times at 10 minute intervals and allowed to stand for 10 minutes, the weight and the acrylic plate were removed, and 16 sheets of filter paper (ADVANTEC 5C 10 mm x 10 mm) were stacked on the sample and further placed thereon. The weight was placed and a load of 3.4 kPa (35 gf / cm 2) was applied. After leaving for 2 minutes in that state, the mass of artificial urine absorbed by the filter paper was measured, and the amount was defined as the liquid return amount.

(Test 2)

About each sample of Example 31 and Comparative Examples 31-33, the absorber width direction center part of the point which becomes 155 mm from the abdominal absorber end part of the sample which developed in the plane to the back end part in the longitudinal direction was made into the liquid injection point. The surface sheet of the surrounding (10 mm x 20 mm) surface was cut beforehand about the injection point, and 80 g of artificial urine was injected at the speed of 5 g / sec using the pump. After standing still for 10 minutes, the surface sheet was peeled off slowly and the mass was measured. The artificial urine absorbed by the surface sheet was sucked with Kim towel or the like, the surface sheet was left to dry overnight, and the mass after the drying was subtracted from the mass was used as the liquid residual amount.

The above evaluation results are shown in Table 6 below. Moreover, the sample used by the said liquid residual test is shown to FIG. 30 and 31. FIG. 30 shows the state after the test execution of the surface sheet of the test body of Example 31, and FIG. 31 shows the state after the test execution of the surface sheet of the test body of Comparative Example 31. FIG. In any of FIG. 30 and FIG. 31, (a) shows the skin-contacting surface side of a surface sheet, (b) shows the non-skin-contacting surface side, and (c) substitutes the figure which partially expanded (b). It is a photograph. Also in any drawing substitute photograph, a black part shows liquid residual.

As is clear from the results shown in Table 6, in the diaper of the two-layer surface sheet shaped by heat seal (Comparative Example 33), the space is maintained without concavity and convexity on the surface side of the surface sheet in the sublayer even under pressure. Although the absorption rate was fast, there were few disposable diapers of Example 31 and Comparative Examples 31 and 32 for the amount of liquid and the amount of liquid return maintained as the remaining liquid in the surface material. This is because, in the disposable diapers of Example 31 and Comparative Examples 31 and 32, since the surface sheet is a single layer in an uneven shape, the thickness is reduced especially under pressure, and the rear surface convex portion of the surface sheet is more inclined to the lower absorber or sublayer. By being in

In addition, when comparing the disposable diapers of Example 31 and Comparative Example 31 with the sublayer and Comparative Example 32 without the sublayer, the sublayer has achieved a great role in suppressing the liquid return amount, especially in the pressure-divided injection. It was found that the amount of liquid return was greatly reduced by the presence of the layer. In addition, the presence of sublayers increased the volume, temporarily retaining the liquid and spreading in the planar direction, indicating that the absorption time was faster than that of Comparative Example 32 without the sublayer.

In addition, compared with the comparative example 31, the disposable diaper of Example 31 reduced the liquid return amount more, and the absorption time was shortened so that it was comparable with the comparative example 33, and the original function of the sublayer was improved. Moreover, compared with the comparative example 31, liquid residual was suppressed. This can also be seen from the fact that the black color of the liquid remaining in FIG. 30 (Example 31) is clearly thinner than that in FIG. 31 (Comparative Example 31). As a result of the liquid residual suppression of this Example 31, the problem of "the absorption of the absorber becomes difficult because the surface sheet moves away from the absorber when there is a sublayer, and the liquid residual amount of the surface sheet tends to increase" (Comparative Example 31). It overcomes and shows that liquid residual was restrained low to the level equivalent to the comparative example 32 without a sublayer. In short, it can be seen that the disposable diaper using the uneven sublayer of Example 31 is excellent in that both the advantages with the sublayer and the advantages without the sublayer are achieved.

While the present invention has been described in conjunction with the embodiments thereof, it is to be understood that the invention is not to be limited to any details of the description thereof except as otherwise specified, and that the invention is not limited to the details and spirit of the invention as set forth in the appended claims. I think it should be interpreted.

The present application is a patent application 2011-151210 filed in Japan on July 7, 2011, a patent application 2011-258874 filed in Japan on November 28, 2011, and a patent in Japan on February 8, 2012. It claims the priority based on the applied patent application 2012-025123, all of which take in the content as a part of description of this specification with reference to here.

1: surface sheet
2: back sheet
21: ridge (part where the back sheet 2 has been recessed into the back recess 7w at the end of the surface sheet 1)
3: absorber
31: absorbent core
32, 33: covering sheet
4: side sheet
5: end lamination
51: integral deformation
52: integral skin side deformation
53: integral non-skin side deformation part
6: sublayer
61: wheat
62: grandfather
7: back side recessed part
7v: back surface on absorber
7w: End back recessed part (back recessed part of surface sheet 1 in end laminated part 5)
71: entrance part (part in which the covering sheet 32 has fallen into the back recessed part 7 of the surface sheet 1)
72: space part
72v: space part in absorber
72w: recessed space portion (space portion on the sublayer)
73: buffer gap
74: junction
8: back side convex part
8v: back recess on absorber
8w: End back convex part (back convex part of surface sheet 1 in end laminated part 5)
78 surface convex
88: surface convex portion
10, 20, 30: disposable diapers

Claims (26)

An absorbent article having a liquid permeable surface sheet disposed on the skin-contacting surface side, a back sheet disposed on the non-skin-contacting surface side, and absorbers interposed therebetween,
The surface sheet is made of a nonwoven fabric, the absorbent body has an absorbent core and a covering sheet covering the same,
On the non-skin-contacting surface side of the surface sheet, a plurality of backside recesses recessed to the skin-contacting surface side are arranged and dispersed adjacently, and the covering sheet is indented into the backside recessed portion, and the covering sheet and the absorbent core that have entered the recessed surface. An absorbent article having a space portion therebetween. The method of claim 1,
The non-skin-contacting surface side of the said surface sheet becomes an uneven | corrugated shape by periodic arrangement of the said back surface recessed part. 3. The method according to claim 1 or 2,
An absorbent article having a concave-convex shape on the skin-facing surface side of the surface sheet. 4. The method according to any one of claims 1 to 3,
An absorbent article as described above, wherein the skin contacting surface side of the absorbent core has a flat shape. 5. The method according to any one of claims 1 to 4,
The absorbent article of the said back sheet in the said back recessed part of the said surface sheet | seat is 50% or more of the depth of the recessed part of the said back recessed part. 6. The method according to any one of claims 1 to 5,
The said back recessed part WHEREIN: The absorbent article which has a clearance gap between the said surface sheet and the non-tipped part of the said coating sheet. 6. The method according to any one of claims 1 to 5,
The said back recessed part has the part which the said coating sheet and the said surface sheet have joined together. The method according to any one of claims 1 to 7,
On the non-skin-contacting surface side of the surface sheet, a plurality of back concave portions and a plurality of back convex portions are disposed, and each of the back convex portions is surrounded by a plurality of the back concave portions and arranged independently from each other. An absorbent article whose spaces are connected to each other. The method according to any one of claims 1 to 8,
The back recessed portion has an upper portion, a side wall portion, and a bottom portion formed of a surface sheet, and has an density difference or a density gradient of the nonwoven fabric of the surface sheet rising from the upper portion to the bottom portion. 10. The method according to any one of claims 1 to 9,
The absorbent core has a dense structure of fiber density, and the absorbent article has a coarse portion of the density of the absorbent core and an overlapping portion of the space portion. 11. The method according to any one of claims 1 to 10,
The absorbent article in which the covering sheet and the absorbent core are intermittently bonded with a hot melt adhesive. 12. The method according to any one of claims 1 to 11,
The absorbent article in which the fiber density becomes large from the skin surface side to the non-skin surface side in the cross section of the said back surface recessed part. 13. The method according to any one of claims 1 to 12,
The absorbent article has an end laminate in which the front sheet and the back sheet are directly and indirectly laminated and bonded together without interposing the absorbent body outside the longitudinal end of the absorbent body,
The end laminated portion has a plurality of integral deformation portions in which opposing surfaces of the front sheet and the back sheet are integrally deformed in a convex shape in a thickness direction, and the plurality of deformable portions are absorbed in a planar direction of the end laminated portion. article. 14. The method of claim 13,
The opposing surface of the said front sheet and the said back sheet in the said edge part laminated part has a meandering shape in the thickness direction by the deformation | transformation which the said integral deformation part forms, as seen from the cross section of a longitudinal direction. The method according to claim 13 or 14,
On the non-skin-contacting surface side of the surface sheet, a plurality of back recesses recessed to the skin-contacting surface side are formed to be dispersed and arranged adjacently, and the back sheet is squeezed into the back recesses in the end laminate. An absorbent article forming an integral deformation part. The method of claim 15,
The absorbent article as described above, wherein the back recessed portion in the end laminated portion is a recess in a substantially conical shape. 17. The method according to any one of claims 13 to 16,
The surface sheet is an absorbent article made of a nonwoven fabric having a concave-convex shape on both surfaces. 18. The method according to any one of claims 13 to 17,
The said end laminated part WHEREIN: The absorbent article in which the elastic member is arrange | positioned in the width direction between the said front sheet and the said back sheet. 19. The method according to any one of claims 13 to 18,
The absorbent article according to the end lamination section, wherein a sheet made of a nonwoven fabric is interposed between the front sheet and the back sheet. 20. The method according to any one of claims 1 to 19,
On the non-skin-contacting surface side of the surface sheet, the convex portions of the back surface are interspersed with each other to form a concave-convex shape. A liquid permeable sublayer is disposed between the surface sheet and the absorber, and the sublayer and the back convex portion of the surface sheet are provided. We are in contact with abutment part,
An absorbent article having a fiber density of the sublayer in the contact portion higher than that of other portions of the sublayer. 21. The method of claim 20,
The peripheral part of the said back surface convex part in the non-skin-contacting surface side of the said surface sheet forms a back surface recessed part recessed from the non-skin-contacting surface side to the skin-contacting surface side, and is recessed between the back surface recessed part and the said sublayer. An absorbent article having a subspace portion formed therein, wherein the fiber density of the sublayer at the position of the recess space portion is lower than the fiber density of the sublayer in contact with the backside convex portion. 22. The method according to claim 20 or 21,
An absorbent article having a fiber structure in which the gap between the fibers of both members is maintained at the contact portion between the rear convex portion of the surface sheet and the sublayer. 23. The method according to any one of claims 20 to 22,
The absorbent article in which the back surface convex part of the said surface sheet and the contact part of the said sublayer are mixed and what is non-adhesive are mixed. 24. The method according to any one of claims 20 to 23,
In the contact portion of the back surface convex portion of the surface sheet with the sublayer, the sublayer forms a recess recessed toward the non-skin contact surface, and the back convex portion of the surface sheet is recessed into the recess of the sublayer. Absorbent article in contact. 25. The method according to any one of claims 20 to 24,
The ratio of the area area of the contact part with the back surface convex part with respect to the sheet area of the said sublayer is 1/20 or more and 2/5 or less. 26. The method according to any one of claims 20 to 25,
The absorbent article of the sublayer in the contact part with the back convex part of the said surface sheet is 15 piece / mm <2> or more and 120 piece / mm <2> or less.

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