KR20130124957A - Absorbent article - Google Patents

Abstract

A longitudinally elongate 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 disposed between both sheets, wherein the absorbent body is orthogonal to the longitudinal direction. In the area | region which has a width direction and corresponds to an excretion part, the groove-shaped recessed part recessed in the thickness direction from the non-skin-contacting surface side in each direction of the longitudinal direction and the width direction of an absorber, and the skin part of the recessed part The liquid-permeable structure comprised by the recessed part absorption part containing the pulp fiber of the bottom part of a contact surface side is arrange | positioned, The area | region enclosed with the liquid-permeable structure protrudes to the non-skin-contacting surface side, and contains the said pulp fiber, The said recessed part absorption part It has a higher basis weight block-shaped protrusion absorbing part, the recessed part absorbing part of the said liquid-permeable structure is low density, and the said block-shaped protrusion absorbing part is relative High density absorbent articles.

Description

[0001] ABSORBENT ARTICLE [0002]

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

In absorbent articles, such as a sanitary napkin, the material and the structure of each member were improved, and the function and the wearing feeling were improved. Also for the absorber, various improvements have been proposed in accordance with the use situation and the kind of the article.

For example, in the napkin which has a surface sheet, a back sheet, and an absorber, what arrange | positioned so that many compression parts recessed from the back sheet side of an absorber may be arrange | positioned (refer patent document 1). The compression portion and the non-compression portion that are not compressed form a continuous gradient by slowly changing the thickness, and a density gradient is formed from the non-compression portion to the compression portion. Thereby, while the liquid guide | induced to the absorber from a surface sheet is quickly attracted, realizing sufficient absorption holding | maintenance amount of a liquid, it can improve the liquid return prevention property and the leak prevention property. Moreover, the absorbent article which has the absorbent body which divided | segmented the high density part and the low density part which extended in stripe shape in the vertical direction is disclosed (refer patent document 2). By this absorber, the liquid diffusion in the longitudinal direction of the liquid is promoted, the liquid attractability is excellent, and it can flexibly deform even in the pressure from the width direction.

Japanese Laid-Open Patent Publication 2006-55352 Japanese Unexamined Patent Publication No. 2010-136899

The present invention further improves the absorbent performance of the conventional absorbent article, thereby more effectively suppressing liquid residue or liquid return to the surface sheet, preventing it from agglomerating, and responding quickly when there is a large amount of body fluid excretion at once. Another object of the present invention is to provide an absorbent article having excellent flexibility to fit the body of the wearer and follow the movement well.

The present invention is a longitudinally 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 disposed between both sheets, wherein the absorbent body has a longitudinal direction and It has a width direction orthogonal to this,

In the area corresponding to the excretion portion, a groove-shaped recess recessed in the thickness direction from the non-skin contacting surface side in each of the longitudinal direction and the width direction of the absorber, and the bottom of the skin contacting surface side of the recess. A liquid-permeable structure composed of a recess absorbing portion containing pulp fibers of

The area enclosed by the liquid-permeable structure is provided with a block-shaped protruding absorption portion protruding toward the non-skin-contacting surface side and including pulp fibers and having a higher basis weight than the recess absorption portion,

The concave absorbent portion of the liquid-permeable structure has a low density, and the block-shaped protruding absorbent portion solves the above problems with a relatively high-density absorbent article.

The absorbent article of the present invention exhibits the effect of more effectively suppressing liquid retention and liquid return to the surface sheet and preventing it from lumping. In addition, the absorbent article of the present invention is capable of responding quickly when a large amount of body fluid is excreted at once, and also has an effect of being excellent in flexibility of being fitted to the wearer's body and well following the movement.

These and other features and advantages of the present invention will become more apparent from the following description, with reference to the accompanying drawings as appropriate.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partially cutaway perspective view which showed the sanitary napkin as one Embodiment of the absorbent article in this invention from the skin contact surface direction.
FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. 1.
FIG. 3: is a figure which shows typically the absorber which concerns on this embodiment, (A) is a top view which looked at the absorber from the skin contacting surface side, (B) is sectional drawing along the line B-B of (A), ( C) is the top view which looked at the absorber from the non-skin-contacting surface side.
4 is a process explanatory diagram schematically showing a state before and after press roll processing at the time of manufacture with respect to the preferable manufacturing method of the absorber which concerns on this embodiment.
FIG. 5: is sectional drawing which shows typically the process of forming an absorber precursor in the recessed part for integration of the surface of a rotating roll about the preferable manufacturing method of the absorber in this embodiment.
It is a partially cutaway perspective view which showed the sanitary napkin as another embodiment (2nd embodiment) of the absorbent article in this invention from the skin contact surface direction.
FIG. 7 is a II-II cross section shown in FIG. 6. FIG.
FIG. 8 is a partial cross-sectional view showing an enlarged portion of the predetermined cross section of the sanitary napkin shown in FIG. 6.
It is a partially cutaway perspective view which showed the sanitary napkin as another embodiment (third embodiment) of the absorbent article in this invention from the skin contact surface direction.
FIG. 10 is a cross-sectional view taken along the line II-II shown in FIG. 9.
FIG. 11: is a top view which showed typically the absorber of the sanitary napkin shown in FIG. 9 at the non-skin-contacting surface side. FIG.
FIG. 12 is a partial cross-sectional view showing an enlarged portion of a predetermined cross section of the sanitary napkin shown in FIG. 9.
It is a schematic sectional drawing which shows a part of form of the absorber manufactured in the reference example and the comparative example.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail with reference to drawings based on the preferable 1st-3rd embodiment.

[First Embodiment]

1: is a partially cutaway perspective view which showed the sanitary napkin as 1st Embodiment of the absorbent article in this invention from the skin contact surface direction, and FIG. 2 is the II-II cross section shown in FIG. FIG. 3: is a figure which shows typically the absorber which concerns on 1st Embodiment, (A) is a top view which looked at the absorber from the skin contacting surface side, (B) is sectional drawing along the line B-B of (A), ( C) is the top view which looked at the absorber from the non-skin-contacting surface side. In addition, in these figures, in order to avoid the complexity, the core wrap sheet of an absorber is abbreviate | omitted and shown. 3, the leak prevention groove is abbreviate | omitted for understanding of the shape of an absorber.

In the sanitary napkin 10 of this embodiment, the absorber 3 is bonded and formed in the skin contacting surface side of the back sheet 2 by an adhesive agent, etc., and is arrange | positioned. Moreover, the side sheet 4 abuts against the back sheet 2 at the outer side of the said left and right both sides of the said absorber 3 in the skin contact surface side of the back sheet 2, and is joined. In the part where the back sheet and the side sheet abut, the surface sheet 1 is fitted into the back sheet 2 and the side sheet 4, and the surface sheet 1 is absorbed toward the width direction (X direction) inward direction. (3) It is arrange | positioned so that it may be located in the skin contact surface side more. The sheet members thus laminated are joined by heat seals or the like without the absorber 3 outside the absorber 3 to form the outer periphery 6 of the napkin 10. . The outer periphery 6 is joined to such an extent that the liquid once absorbed does not leak without impairing the overall elasticity. The free end 41 of the side sheet 4 is provided with a pocket (not shown) facing the outer periphery 6, and has an effect of preventing side leakage such as liquid. Moreover, the wing part 42 which has the side sheet 4 extends toward the width direction outward of the sanitary napkin 10 in the width direction left and right both sides of the sanitary napkin 10 in this embodiment, This part is rolled up to the non-skin contact surface side of the crotch part in shorts, and the sanitary napkin 10 is fixed to the shorts.

On the skin-contacting surface side of the sanitary napkin 10, a leak-proof groove 5 compressed from the skin-contacting surface side of the surface sheet 1 over the absorbent body 3 is formed (see FIGS. 1 and 2). In the plan view of the leak-proof groove 5, in the longitudinal center portion of the absorber 3, a crimped portion having a length in the longitudinal direction on both the widthwise left and right sides of the excretion-part corresponding area such as acupuncture points It arrange | positions, As each left and right crimping part approaches to the front-back end of the absorber 3, it gradually curves toward the center direction of the absorber 3, and coincides at the front end and the rear end. In short, the leak-proof groove 5 is continuous in an endless annular shape in which two crimp portions arranged on both sides of the sanitary napkin 10 in the longitudinal direction extend in the front-rear direction. Shape (see FIG. 1).

By doing in this way, the side leak of the excretion liquid at the time of attaching and using a napkin can be prevented effectively. In addition, the excretion-part correspondence area | region is the part which accommodates excretion, such as acupuncture points or a lobster directly, and its vicinity, and is the position where the wing part 42 is arrange | positioned in the longitudinal center part in the napkin 10 of this embodiment. In addition, the shape seen from the plane of the leak prevention groove | channel 5 in this embodiment is not limited to the shape mentioned above, It may intersect with each other at the front end and the rear end of an endless annular shape, and it determines suitably according to a use. desirable.

The material, dimensions, etc. of the front sheet 1, the back sheet 2, the side sheet 4, and the absorber 3 are mentioned later. In this embodiment, the surface sheet 1 uses a hydrophilic air-through nonwoven fabric from the viewpoint of quickly absorbing the liquid discharged and delivering it to the absorber and from the viewpoint of good feel. In addition, as the back sheet 2, a moisture-permeable film having air permeability is used as a single layer. As the absorber 3, pulp fibers and the like are coated with a core wrap sheet (not shown) such as paper. Moreover, the adhesive (not shown) for fixing the sanitary napkin 10 to a wear is apply | coated to the non-skin-contacting surface side of the back sheet 2. By the adhesive, the sanitary napkin 10 is adhesively fixed to the wearer of the user. The sanitary napkin 10 of this embodiment faces the surface sheet side toward the skin-contacting surface side of the wearer, and arranges the longitudinal direction from the lower abdomen to the buttocks, and connects the left and right legs in the width direction. Wear it by placing it in the direction of the line.

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-non-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 in the planar view of the absorbent article is referred to as the longitudinal direction, and the direction orthogonal to the longitudinal direction is referred to as the width direction. In addition, the longitudinal direction typically coincides with the front-rear direction of the human body in a mounted state.

The absorbent body 3 of this embodiment coat | covers the mixed red fiber of pulp fiber and a superabsorbent polymer with the core wrap sheet. The absorbent body 3 is a state where the absorbent material is coarse compared to the high density region 38 and the high density region 38 in which the absorber material (constituent fibers and the superabsorbent polymer) is present in a dense state at least in the excreted portion corresponding region. It has a low density area | region 39 which exists. As shown in Fig. 3A, the low-density region 39 is continuous in the plane direction, and the high-density region 38 is surrounded by the low-density region 39 and interspersed with a sea-island arrangement. It is.

In the thickness direction of the low-density region 39, as shown in FIG. 3B, the concave portion 31 which becomes a void by recessing from the non-skin-contacting surface side of the absorber 3 to the skin-contacting surface side and the skin thereof The recessed part absorption part 34 containing the pulp fiber in the bottom part of the contact surface side is arrange | positioned. The recessed part 31 is arrange | positioned in each of the longitudinal direction and the width direction of the non-skin-contacting surface side of an absorber corresponding to the low density area | region 38 as shown to FIG. 3 (B) and (C). The arrangement in the longitudinal direction and the width direction means that a plurality of sets of recesses 31 are arranged at predetermined intervals in a plan view of the absorber 3. Therefore, the rows of recesses extending in the longitudinal direction are arranged at predetermined intervals in the width direction, and the rows of recesses extending in the width direction are arranged at predetermined intervals in the vertical direction.

The rows of the recesses 31 may be continuous or intermittent. The recessed part absorption part 34 is arrange | positioned corresponding to the recessed part 31, as shown to FIG. 3 (A) and (B). The concave portion 31 and the concave portion absorbing portion 34 quickly draw the liquid on the skin surface side of the absorber 3 in the thickness direction, and hold and fix the liquid in the protruding absorbing portion 33 without returning the liquid. It is a fluid structure that effectively urges. This point will be described later. Moreover, in the thickness direction of the high density area | region 38, it is partitioned as the some block-shaped protrusion absorption part 33 which protruded to the back sheet 2 side as a part enclosed by the recessed part 31 (FIG. 3 (B) and (C)). The protruding absorbing portion 33 absorbs and holds the excretion liquid, including pulp fibers and an absorbent polymer.

In this embodiment, the shape of each protrusion absorption part 33 is a substantially rectangular shape which has length in the vertical direction. The arrangement of the protruding absorbing portions 33 is in the longitudinal direction so as to have a predetermined gap s, r (see FIG. 3 (C)) from each other in a natural state when viewed from the plane seen from the non-skin-contacting surface side of the absorber 3. Are arranged in alignment. This arrangement is an arrangement in which the projected images overlap in any direction when the plurality of protrusion absorbing portions 33 are projected in the longitudinal direction and the width direction. The entire absorbent body 3 including the concave absorbing portion 34 and the protruding absorbing portion 33 forms a seamless integral structure.

The protruding absorbing portion 33 disposed in the high density region 39 has a higher density of the absorber material than the concave absorbing portion 34, has a higher capillary force, and has a higher basis weight than the concave absorbing portion 34. Since it is a part, the absorption retention amount of liquid is also high. In short, the protrusion absorbing portion 33 mainly serves to hold and fix the liquid. On the other hand, the recessed absorber 34 disposed in the low density region 38 is a portion having a lower basis weight that is relatively lower in density than the protrusion absorbing portion 33 and is thinner than the protrusion absorbing portion 33. . Therefore, the recess absorption part 34 is lower in the fluid resistance than the protrusion absorption part 33, and can permeate | transmit a liquid quickly in the thickness direction of the absorber 3, without impairing the pressure loss of liquid.

This point is explained with reference to FIG. 3 (B), compared with the high-density region 38 of the absorber 3 in which the protruding absorbing portion 33 is disposed, the recessed portion 31 and the recessed portion absorbing portion 34. The basis weight of the low-density region 39 of the absorber in which is disposed is low, and the density is also low. Concave absorbing portion 34 quickly draws the liquid (Fig. 3 (B) arrow a ₁ ), and a plurality of protruding absorbing portions 33 adjacent to this extract the liquid further by its capillary force (Fig. 3 ( B) The arrow c ₁ ) and the liquid can be held and fixed at a position farther from the skin surface side of the absorber 3.

Moreover, the part 33a by the skin contacting surface side of the recessed absorption part 34 and the protrusion absorption part 33 is continued in a plane direction, and becomes the continuous part 35 in the skin contacting surface side of the absorber 3. (See FIG. 3 (B)). The continuous part 35 is a shape flat with respect to the surface sheet 1. Since the flat continuous part 35 forms the skin contacting surface side of the absorber 3, the contact of the surface sheet 1 and the absorber 3 is favorable, and the liquid which passed the surface sheet 1 is absorbed by the absorber 3 It is easy to lead to.

The continuous portion 35 will be described with reference to FIG. 3 (A). As described above, the continuous portion 35 includes the low density region 39 and the protruding absorbing portion 33 formed of the concave absorbing portion 34. It is partitioned into the high density area | region 38 which consists of the parts 33a of a. In this continuous portion 35, the low density region 39 composed of the low basis weight and low density recessed portion absorbing portion 34 becomes a coating liquid path in which the liquid holding amount is suppressed, and the low density region. As the 39 is continuously extended in the planar direction of the absorber 3, the liquid from the surface sheet 1 can be quickly drawn into the absorber 3 within a wide range (Fig. 3 (A) arrow b). ₁ ).

The liquid that has passed through the recessed absorber 34 is dispersed in the plurality of projected absorbent portions 33 from one side, drawn out, held and fixed (Fig. 3 (B) arrow c ₁ ), and the recessed portion 31 from the other side. Is accepted once (FIG. 3 (B) arrow c ₂ ). The liquid absorbed into the recess 31 is absorbed and retained in the projecting absorber 33. Of course, the liquid can also be directly absorbed and held in the part 33a (part of the continuous part 35) of the protruding absorbing part 33. However, when high viscosity liquids such as acupuncture points or the like are excreted in large quantities or repeatedly excreted at one time, the recessed portion absorbing portion 34 pulls quickly even if it cannot be absorbed and retained in the protruding absorbing portion 33 at one time. Indentation 31 achieves a buffer function to hold the liquid temporarily. In addition, as described above, the concave portion 31 is connected at the non-skin-contacting surface side of the absorber 3 (see FIG. 3 (C)) to plan the liquid at a position farther from the surface sheet 1. moved in the direction (Fig. 3 (C) arrow d _1), it is possible to reliably maintain the absorption at the plurality of protruding absorption part 33 scattered in a wide range (FIG. 3 (C) arrow d _2).

Thus, by the liquid-permeable structure which consists of the recessed part absorption part 34 and the recessed part 31, a liquid is quickly received in the absorber 3 inside from the surface sheet 1 side, and it is reliably at the protrusion absorption part 33. Absorption can be maintained. As a result, liquid retention at the skin-contacting surface side of the absorber 3 is suppressed, and liquid return from the absorber 3 to the surface sheet 1 is unlikely to occur.

In the napkin 10 of the present embodiment, even when there is a pressure in such a thickness direction during mounting, the excretion liquid such as acupuncture points becomes difficult to return to the surface sheet 1 side. This allows the above-described high-density region 38 to be present in the low-density region 39 without quickly leaving a liquid on the surface sheet or the skin-contacting surface side of the absorbent body 3, thereby quickly pulling the liquid in the thickness direction to obtain a plurality of structures. It is one factor that is held and fixed to the protruding absorbing portion 33 of. In addition, the liquid-permeable structure which consists of the recessed part absorption part 34 and the recessed part 31 mentioned above acts to suppress liquid return by urging | attracting and moving a liquid.

Specifically, the recess absorbing portion 34 quickly draws the recess 31 without retaining the liquid, the recess absorbing portion 34 serving as the low density region and the projecting absorbing portion serving as the high density region 38. Due to the continuous density change (structural arrangement capable of highly diffusing a large amount of liquid) made by (33), it is possible to quickly diffuse a liquid that cannot be attracted to a recess due to proper diffusivity in the planar direction, to the recess 31. The liquid once drawn in is positioned relatively farther than the skin-contacting surface side of the absorbent body 3, and the liquid moves quickly from the non-skin-contacting surface side of the absorber 3 to protrude by the liquid-permeable structure having the recessed part 31. It is thought that this is caused by a plurality of actions such as the storage portion of the recessed portion 31 itself is not increased because it is retained by the absorption portion 33. In addition, the pressure applied to the recessed portion 31 is alleviated by the presence of the recessed portion absorbing portion 34, and the movement of the liquid in the liquid-permeable structure having the recessed portion 31 at this pressure is urged. I think.

Moreover, since the absorbent body 3 is a form which supports from the skin contact surface to the non-skin contact surface by the protrusion absorption part 33 of the high-density area | region 38, deformation with respect to the pressure of the thickness direction hardly arises. It is effective in suppressing liquid return and preventing torsion. By quickly drawing the liquid into the concave portion 31 without leaving the liquid on the surface sheet 1 side of the absorber 3 in this way, the return of the liquid to the surface sheet 1 side is effectively suppressed even at the pressure in the thickness direction. A good dry feeling is obtained. Moreover, since the non-skin-surface side of the absorber 3 is the uneven | corrugated shape divided by the longitudinal and horizontal recessed part 31, it has the flexibility of the vertical direction and the width direction in the part, and the sanitary napkin 10 is a skin surface. The "physical fitness" fitted to the ups and downs of the body and the movement of the wearer are favorably followed, and the "movement followability" which prevents the partial gap from occurring to the skin becomes very high.

In the present invention, the arrangement of the protruding absorbing portions 33 can be appropriately selected according to the use and function in addition to those of the present embodiment. Arrangement with approximately half-pitch shift) in a direction. Moreover, the thing of arbitrary shape can be employ | adopted for the shape of the protrusion absorption part 33 suitably according to a use and a function other than this embodiment.

Thus, the recessed part absorption part 34 suppresses the holding amount of liquid, and moves a liquid to the recessed part 31 quickly, and the recessed part 31 has the function of temporary storage of excretion liquid, and has the surface sheet | seat 1 In order not to return liquid to the side, the average density (m ₁ ) of the structural member of the absorber of the recessed part absorption part 34 as the low density area | region 39 is 0.02-0.09 g / cm <^3>. Is preferred, and 0.03 to 0.08 g / cm ³ More preferred. Moreover, in order to maintain and fix a certain liquid, the average density (m <2>) of the structural member of the absorber of the protrusion absorption part 33 as the high density area | region 38 is 0.10-0.25 g / cm <^3>. Is preferred, and 0.10 to 0.20 g / cm ³ More preferred. In addition, although the protrusion absorption part 33 is a part which becomes high density by the compression at the time of manufacture, even if a uniform density is not formed in the thickness direction, for example, it should just be higher than the recess part absorption part 34 as a whole, and a low density area | region As for the ratio (m <_1> / m <2>) of the average density (m <_1> ) of the recessed part absorption part 34 as 39, and the average density (m <_2> ) of the protrusion absorption part 33 as the high density area | region 38, 0.80 or less is preferable. And 0.60 or less are more preferable. By setting it below the upper limit with respect to this ratio (m <_1> / m <2>), the liquid is hold | maintained temporarily in the low-density area | region 39, and the high density area | region 38 is controlled by the capillary force which acts between the high-density area | region 38. FIG. ) An absorption mechanism for sucking and holding the liquid is expressed.

Moreover, for the same reason, the average basis weight w ₁ of the constituent members of the absorber of the low density region 39 (see FIG. 3 (B)) having the recessed portion absorbing portion 34 and the recessed portion 31 is 10 to 160. It is preferable that it is g / m <2>, and it is more preferable that it is 20-150 g / m <2>. Configuration average basis weight (w ₂₎ of the members of the absorbent article of the high density region 38 having a projected absorbing unit 33 (see Fig. 3 (B)) is preferably from 160 ~ 400 g / ㎡ preferably, 200 ~ 350 g / It is more preferable that it is m <2>. The average basis weight ratio of the constituent members of both the absorber (w ₁ / w ₂₎ is preferably from 0.01 to 0.90, and more preferably 0.1 to 0.7. Ratio (%) of the (thickness of the projecting absorber 33), the depth (h ₂₎ the absorber (3) the thickness of the recess (31), (h ₁₎ (see Fig. 2) is preferably from 20 to 98% And it is more preferable that it is 30 to 70%.

In the present invention, the concave portion 31 is a portion which is recessed from the bottom of the absorber 3 toward the skin-contacting surface side and becomes a void. The recess absorption part 34 is a part of the absorber 3 located in the upper part of the recess part 31, and is partitioned by the virtual line t, t extended from the wall surface bottom part 31a, 31a in the thickness direction. Part of the absorbent body 3 (see FIG. 3 (B)). The protruding absorbing portion 33 is adjacent to the region 39 of the concave portion 31 and the concave portion absorbing portion 34 lined in the thickness direction, and the region 38 from the top to the bottom of the absorber surrounded by the region 39. ) (See FIGS. 2 and 3 (B)).

[Measurement Method of Average Density of High Density Region 38 and Low Density Region 39]

The density of the high density area | region 38 and the low density area | region 39 in the said definition is the density which combined the pulp fiber which is a structural member of the absorber 3, and a superabsorbent polymer. The absorber 3 is cut into imaginary lines t, t extending in the thickness direction from the wall bottoms 31a, 31a of the concave portion 31, and the protruding absorbing portion 33 of the high density region 38 and the low density. It is set as the recessed part absorption part 34 of the area | region 39, These are cut out to the size of length 50mm and width 5mm, respectively, and the sample is prepared. Subsequently, the mass of a sample is measured using electronic balance (Electronic balance GR-300 by A & D, Inc., precision: 4 digits after the decimal point). The sample thickness is measured using a static pressure gauge, and the mass of the measured sample is divided by the volume (thickness x length x width) of the sample to calculate the density of the entire material of the site in each region. In addition, the pressure at the time of the measurement of a low-pressure thickness meter is performed at 0.5 g / cm <2>. The average density adjusts ten samples at arbitrary points, and is calculated | required by the average.

[Measurement Method of Average Basis Weight of High Density Region 38 and Low Density Region 39]

A method for measuring a high-density region 38, the average basis weight (w ₂₎ the average basis weight (w ₁₎ of the low-density region 39 of the can, and pre-measuring the area of each area measuring, above the measurement area, the virtual line The cutter is cut at (t, t) and the mass of the cut portion is measured. The measured mass is divided by the area and the average basis weight of each density area is measured. An average basis weight adjusts ten samples at arbitrary points, and is calculated | required by the average.

[Measurement of the thickness of the protrusion absorbing portion 33 and the recessed portion absorbing portion 34 (and the recessed portion 31)]

First, the concave portion 31 is recessed from the bottom of the absorber 3 toward the skin-contacting surface side to form a portion with voids, and the concave portion absorber 34 is an absorber 3 positioned above the concave portion 31. Can be classified as a part consisting of a material (Fig. 3 (B)). The protruding absorbing portion 33 is a portion from the upper portion to the lower portion formed of the material of the absorber 3 enclosed adjacent to the low density region 39 of the concave portion 31 and the concave portion absorbing portion 34 arranged in the thickness direction. It can be distinguished (FIG. 3 (B)). The boundary between the protruding absorbing portion 33, the concave absorbing portion 34, and the concave portion 31 is an imaginary line t, t extending in the thickness direction from the wall surface bottom portions 31a, 31a of the concave portion 31. ), (FIG. 3B).

The thickness (h ₃ ) of the recessed portion absorbing portion 34 thus divided = h ₁ - h ₂₎ and the measurement of the thickness (h ₁₎ of the projected absorbing unit 33, size 37 ㎜ × 37 ㎜, place an acrylic plate having a thickness of 3 ㎜ on the absorber (3), KEYENCE Corp. non-contact laser displacement meter ( Using the laser head LK-G30 and the displacement meter LK-GD500, the thickness h ₁ of the protrusion absorbing portion 33 is measured, and the thickness h ₃ of the recess absorbing portion 34 is the cross section corresponding to FIG. 2 of the absorber. Was measured by using a microscope VHX1000 manufactured by KEYENCE.

Next, the preferable manufacturing method of the sanitary napkin 10 mentioned above is demonstrated with reference to FIGS. In addition, the shape of the absorber 3, the number, shape, arrangement | positioning, etc. of the recessed part 31 and the protrusion absorbing part 33 are shown typically, and do not necessarily need to be the same as that shown in FIGS.

FIG. 4: is a figure which shows the manufacturing apparatus 60 of the absorber used preferably for manufacture of the absorber 3 of the sanitary napkin 10. As shown in FIG. As shown in FIG. 4, the manufacturing apparatus 60 is directed toward the outer drum surface of the rotating drum 62 in which the some recessed part 9 (sedimentation part) for a predetermined | prescribed interval was formed in the outer peripheral surface, and the rotating drum 62. As shown in FIG. The duct 63 for supplying the fiber material S in the scattered state, the fiber material supply part 64 for supplying the fiber material S to the duct 63, and the accumulation recess 9 so as to overflow. A covering mechanism for covering the upper and lower surfaces of the scuffing roll 65 scraping off the excess fiber material and the upper and lower surfaces of the deposit (absorber precursor) 70 released from the accumulation recess 9 with the core wrap sheet 3b. (Not shown) and the compression device 66 which presses and compresses the absorber continuum obtained by covering the absorber precursor 70 with the core wrap sheet 3b between the pair of press rolls 66a and 66b, and the compression. Absorption after processing by cutting after absorber continuum to the dimension used for individual sanitary napkins And a cutting device (not shown) to (3).

The rotating drum 62 forms a cylinder and is rotationally driven at a constant speed in the direction of arrow A in FIG. On the outer circumferential surface of the rotary drum 62, a plurality of integration recesses 9 are formed. An intake fan (not shown) is connected to the non-rotating portion inside the rotating drum 62 (the rotating shaft side), and the spaces B and E partitioned inside the rotating drum are held at a negative pressure by driving the intake fan. do. The bottom part of each accumulation recessed part 9 is comprised by the mesh plate, and has many pore. While the individual concave recesses 9 pass through the spaces B and E held at negative pressure, the pores of the bottom face of each concave recess 9 function as suction holes.

The duct 63 has a blowout end 63a covering a part of the outer circumferential surface of the rotary drum 62, and a blown end 63b connected to the fiber material supply device 64. It is comprised so that the airflow which flows toward the outer peripheral surface of the rotating drum 62 in the duct 63 by suction from the bottom part of the accumulation recessed part 9 located on space B can be produced. The fiber material supply part 64 is provided with the islander 64e, and introduce | transduces sheet-like raw material S ', such as a pulp sheet, into the islander 64e by the nip roller 64d for raw material supply, It is configured to supply the resolved fiber material S into the duct 63.

The scuffing roll 65 has a brush around it, and the brush scrapes off the fibrous material S overflowed from within the accumulation recess 62. The deposit (absorber precursor) 70 remaining in the accumulation recess 9 without scraping off with the scuffing roll 65 is released from the accumulation recess 9 below the rotary drum 62. . The release from the accumulation recess 9 maintains the space D partitioned in the rotary drum 62 at a positive pressure by an unillustrated pressure means, and blows air from the pores of the bottom face of the accumulation recess 9. In addition, it carries out by sucking from the vaccum conveyor 67 side. The coating mechanism includes a known conveying mechanism for supplying the core wrap sheet 3b on the vaccum conveyor 67, and the core (after absorbing material precursor) 70 is placed on the core wrap sheet. Both sides of the wrap sheet are folded back on the deposit body (absorber precursor) 70, and the rewinding so as to cover the upper and lower surfaces of the deposit body (absorber precursor) 70 with the core wrap sheet 3b. Consists of. In addition, in FIG. 4, the detail of a refolding process is abbreviate | omitted and the state of the rewound core wrap sheet 3b is also shown simply as two lines.

The method of manufacturing the absorber 3 mentioned above using the manufacturing apparatus 60 of the absorber shown in FIG. 4 is demonstrated.

First, while rotating the rotating drum 62 and the scuffing roll 65, the said intake fan and the said pressurization means are operated, space B and E are made into negative pressure, and space D is made into positive pressure. Moreover, the vaccum conveyor 67, the compression device 66, and the said cutting device are operated. By the operation of the intake fan, suction force is generated in the bottom surface of the accumulation recess 9 located on the space B, and air flows toward the outer circumferential surface of the rotary drum 62 in the duct 63. . And if the fiber material supply apparatus 64 is operated and the fiber material S (pulp fiber 41 and the superabsorbent polymer 42) is supplied into the duct 63, the fiber material S will be scattered. It is loaded on the airflow which flows in the duct 63, and is supplied toward the outer peripheral surface of the rotating drum 62. As shown in FIG.

While the individual concave recesses 9 pass through the space B held at a negative pressure, the fiber material S supplied from the duct 63 is sucked into and accumulated in each concave recess 9. . In each accumulation recess 9, a slight excess amount of fiber material is deposited, and the fiber material overflowing from within the accumulation recess 9 is scraped off with the scuffing roll 65. The deposit (absorber precursor) 70 remaining in the accumulation recess 9 without being scraped off with the scuffing roll 65 is released on the core wrap sheet 3b supplied on the vaccum conveyor 67. do.

Formation of this absorber precursor 70 is demonstrated with reference to FIG. In FIG. 5, in order to understand the ups and downs of an absorber shape, the part in which two projection parts 51 are arrange | positioned instead of the whole recessed part 9 is cut out and illustrated.

In the concave portion 9 for accumulation shown in Fig. 5 (a), the projection 51 of Fig. 5 (a) is screened out and the fiber material S which is a mixture of the pulp fibers 41 and the superabsorbent polymer 42. When redistributing and gradually depositing, redistribution exceeds the height of the protrusion part 51 as shown in FIG. 5 (b), and becomes the absorber precursor 70 of FIG. 5 (c). The portion 74 deposited on the protruding portion 51 becomes the concave absorbing portion 34 of the absorber 3, and the portion 71 where the protruding portion 51 was provided is the concave portion 31 of the absorber 3. do. The portion 73 deposited on the accumulation recess of the projection period becomes the protruding absorbing portion 33 'before being compressed. The portion 75 integrally accumulated higher than the protrusions 51 serves as the continuous portion 35 of the absorber 3.

The deposits (absorber precursors) 70 on the core wrap sheet 3b are covered by both sides of the folded core wrap sheet 3b, and then introduced into the compression device 66 to provide a pair of press rolls ( Pressurized between 66a and 66b). As a result, the protruding absorbing portion 33 'is compressed to be formed as the protruding absorbing portion 33 in the high density region. Then, it cuts by the cutting means which is not shown in figure, and becomes the absorber 3 of the dimension used for individual sanitary napkins. In addition to the press roll 66, the pressurization method may be a method of compressing with a flat press. Irrespective of a compression means, 0.5-5 kgf / cm <2> is preferable and, as for the conditions to pressurize, 1-4 kgf / cm <2> is more preferable.

Thus, the absorbent body 3 is integrally formed, and the unevenness | corrugation is formed in addition to the shape and arrangement | positioning of the protrusion part 51 in the integration recessed part. Since the recess absorber 34 is thin in thickness, the basis weight is lower than that of the projected absorber 33, and unlike the recess absorber 34 formed by pressing such as embossing, the recess absorber 34 has a low liquid resistance. It is easy to make a transition to the thickness direction of a liquid quickly. Moreover, since the absorber 3 integrally formed in this way does not have a part hardened by crimping | compression-bonding, such as embossing, a texture improves. When the napkin 10 having this absorbent body 3 is attached, there is no part that firmly touches through the surface sheet 1, and the softness of the absorbent body 3 can be realized. Furthermore, since it has flexibility in the part of the recessed part 31, it fits in a body and a favorable feeling of wearing is obtained.

In this embodiment, although the superabsorbent polymer inside the absorber 3 exists uniformly, in order to suppress liquid return more effectively, the superabsorbent polymer includes the continuous part 35 including the recessed absorber 34. It is preferable to arrange | position a lot more in the protrusion absorption part 33 rather than the continuous part 35 including the recessed part absorption part 34 in the protrusion absorption part 33 in the non-skin-surface side. It is more preferable that a lot is arranged for convenience. Moreover, it is also preferable to arrange | position a superabsorbent polymer in the non-skin-surface side of the recessed part 31 from the same viewpoint.

Moreover, in the absorber 3 of this embodiment, it is preferable that the liquid-permeable structure which has the recessed part 31 is arrange | positioned to the part of the width direction outer side of the leak prevention groove 5, and is arrange | positioned. This arrangement provides flexibility to both sides of the absorbent body 3 that tends to cause side glands, deforms to surround the inside of the wearer's leg, and fits the crotch, thereby following the movement of the wearer's body and creating a gap. Can be prevented.

Although the size and shape of the protruding absorbing portion 33 and the concave portion 31 according to the present embodiment are not particularly limited, the length in the longitudinal direction of the protruding absorbing portion 33 is slightly different depending on the use of the absorbent article to be used. (k ₁₎ (see Fig. 3 (C)) is 5 ~ 40 ㎜ it is preferable, and more preferably 10 ~ 25 ㎜. The width direction length (k ₂₎ is a 3 ~ 40 ㎜ is preferred, and more preferably 5 ~ 15 ㎜. Moreover, 1-5 mm is preferable and, as for the longitudinal length s of the recessed part 31, 1-3 mm is more preferable. 1-5 mm is preferable and, as for the width direction length r, 1-3 mm is more preferable.

[Second Embodiment]

Next, the sanitary napkin as 2nd Embodiment of the absorbent article in this invention is demonstrated with reference to FIGS. It is a partially cutaway perspective view which showed the sanitary napkin as 2nd Embodiment of the absorbent article in this invention from the skin contact surface direction. FIG. 7 is a II-II cross section shown in FIG. 6. FIG. FIG. 8 is a partial cross-sectional view showing an enlarged portion of a predetermined cross section of the sanitary napkin shown in FIG. 6.

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 members may be given the same reference numerals, and description thereof may be omitted.

The sanitary napkin 20 of 2nd Embodiment differs only in the surface sheet among the structural members of the sanitary napkin 10 of the said 1st Embodiment. The surface sheet in 2nd Embodiment is shown as 21. The surface sheet 21 has many parts which protruded regularly on the skin contacting surface side and the non-skin-contacting surface side, and the protrusion part is arrange | positioned in the same position on the skin-contacting surface side and the non-skin-contacting surface side (FIG. 6). To 8). The detail of the surface sheet 21 is as follows.

As shown in FIG. 7, the surface sheet 21 of this embodiment is formed by laminating | stacking two fiber layers, the upper layer 11 and the lower layer 12, from the skin contact surface side.

The upper layer 11 and the lower layer 12 are joined by the crimping | compression-bonding by the embossing in the many emboss part 15. As shown in FIG. The upper layer 11 and the lower layer 12 are embossed at the same position in plan view, and are recessed in the embossed portion 15 to form a number of valleys. And the non-emboss part between valley parts, ie, the area | region enclosed by the emboss part 15, forms the protrusion part 14. As shown in FIG. The protrusion part 14a of the upper layer 11 protrudes on the skin contacting surface side, and the protrusion part 14b of the lower layer 12 protrudes on the non-skin-contacting surface side. The protrusions 14a and 14b are regularly arranged in the same position of the upper layer 11 and the lower layer 12 in the same plane as the embossed portion 15 described above, whereby the upper layer ( In the 11) and the lower layer 12, many uneven parts are formed over the whole area | region. And as the whole surface sheet 21, many uneven parts are formed over the whole area | region.

The embossed part 15 which becomes the valley part of the upper layer 11 and the lower layer 12 is a part which the fiber of the surface sheet 21 was condensed, and has a higher fiber density than the protrusion part 14 of the surface sheet 21, Maternal power is high. As a result, the excretion liquid can be effectively and quickly transmitted from the surface sheet 21 to the absorber 3. Specifically, the means described in paragraphs [0007] to [0045] of the specification of JP 2004-166849A can be used.

In this embodiment, each embossing part 15 is substantially cross shape which crossed two long axes (refer FIG. 6). Two adjacent embossed portions 15 and 15 at the shortest distance are disposed so as to exist on a substantially extending line in the major axis direction. As a result, a density gradient of the constituent fibers is formed in the surface sheet 21 between the embossed portion 15 and the protrusions 14 in the multi-direction, and the diffusion of the liquid of the surface sheet 21 and the liquid in the thickness direction. Permeability is improved. The shape and arrangement of the embossed portion 15 may be randomly dotted with round or square embosses in addition to those of the present embodiment, and have a density gradient of the constituent fibers and rapid diffusion of the liquid in the thickness direction. The shape or arrangement to be realized can be arbitrarily employed.

Here, the characteristic of the dynamic action of the partitioned absorber 3 and the surface sheet 21 which were mentioned above in the sanitary napkin 20 is demonstrated in detail based on FIG. FIG. 8 is an enlarged partial sectional view of a part of a predetermined cross section of the sanitary napkin shown in FIG. 6. In addition, the back sheet 2 and the side sheet 4 are not shown, but the shape of the surface sheet 21 is schematically shown, and the shape shown by all means in the practice of this invention is avoided. It does not have to be the same shape.

As described above, the surface sheet 21 has high mobility of the liquid in the thickness direction of the liquid excreted by the capillary force using the gradient of density, so that the liquid excreted from the body can be quickly transferred to the absorber 3. Can be. Moreover, since the projection part 14a of the upper layer 11 and the projection part 14b of the lower layer 12 are formed in the same position in the thickness direction (refer FIG. 8), it is easy to move so that a liquid may gather at one point in plan view. Even if the amount of liquid is small, it is preferable because it is led to the absorber 3 and is effectively transmitted to the absorber 3 side. In particular, when the fiber density is different in the upper layer 11 and the lower layer 12, and the fiber density of the lower layer is high, the liquid tends to stay on the lower layer side of the surface sheet, but the liquid is concentrated in the structure so that the surface sheet It is effective in improving the dry feeling by shielding property and low liquid returnability. As described above, the absorber 3 has a plurality of recesses 31 on the non-skin-contacting surface side, and the recesses absorbing portion 34 is disposed on the skin-contacting surface side. The recess absorber 34 has a lower liquid resistance than other absorber portions, and the liquid a ₁ disposed using this portion as a chamber is quickly absorbed toward the thickness direction of the absorber 3. And the liquid on to the implementation in the thickness direction of the absorbent body 3 has a portion thereof is a transition solution (a ₂₎ toward the projected absorbing unit (33, 33) near the other Accepted portion is received in the recess 31 Becomes the stock solution (a ₃ ). Thus, the liquid is transmitted from the topsheet 21 is pulled into the recess in the absorbing part (34), a ₂ By dispersing at A ₃ , the holding amount at the surface side of the absorber is reduced, and the resistance to flow is further lowered. Thereby, the liquid return to the surface sheet 21 can also be suppressed effectively.

Thus, the sanitary napkin 20 in this embodiment has the performance of the surface sheet 21 which has the high permeability of the liquid in the thickness direction, and the high thickness direction of the absorber 3 with the recessed part 31. FIG. By the permeability of the liquid to be able to be exhibited sufficiently, thereby suppressing the return of the liquid to the skin of the moisture received, thereby exhibiting the effect of imparting a desirable dry feeling to the user.

As described above, in the napkin 20, the surface sheet 21 can be moved while concentrating the liquid, so that the residual amount of liquid in the surface sheet 21 can be reduced (improved dryness), and the absorber 3 ), The return of liquid can be suppressed because there are few parts directly in contact with each other. Moreover, in such a surface sheet 21, if the low-density area | region 39 and the high-density area | region 38 of the absorber 3 are formed in the skin contact surface side, the recessed part of the low-density area | region 39 among the above-mentioned effects. The feeling of dryness in the surface sheet 21 can be improved more by expression of the suitable diffusivity resulting from the continuous density change which the absorption part 34 and the protrusion absorption part 33 of the high density area | region 38 make. In addition, since the above-mentioned continuous density change in the absorber 3 is formed only around the high density region 38, excessive diffusivity is not expressed and leakage can be suppressed.

The material of the surface sheet 21 and its preferable manufacturing method are described below.

The surface sheet 21 is made of, for example, an upper layer 11 made of a non-heat shrinkable fiber material or a fiber having a higher heat shrink temperature than a lower layer fiber, and a lower layer made of a heat shrinkable fiber material before shrinkage having a higher heat shrink temperature than an upper layer fiber ( 12).

The upper layer 11 and the lower layer 12 are partially or entirely fused in a predetermined pattern by embossing such as heat, and then heat is applied to thermally shrink the lower layer 12 in the horizontal direction. Then, since the upper layer 11 and the lower layer 12 are embossed, when the lower layer 12 shrinks, the upper layer 11 is integrated with the lower layer 12 by embossing, so that the upper layer 11 is pulled down. . However, since the top layer 11 does not undergo heat shrinkage or is smaller in heat shrinkage than the bottom layer 12, deformation occurs, and this deformation appears as a convex bump in the top layer 11. Along with this, the lower layer 12 is also convexly raised in the lower layer 12 in that strain is transmitted to the lower layer 12 from the upper layer 11. In detail, thermal fusion by thermal embossing, for example, the upper layer 11, the embossed surface (such as the circumferential surface of the embossing roll) formed of a plurality of embossed pins having a predetermined shape arranged in a predetermined pattern To the upper layer 11 and the lower layer 12 side in the laminate of the lower layer 12, and to melt the constituent fibers of the upper layer 11 and the lower layer 12 in the portion heat-pressed to each pin. Is carried out. The protrusion part 14 formed by the upper layer 11 and the lower layer 12 may have the part extended so that the emboss part may be covered.

The thermal contraction of the lower layer 12 comprises, for example, the lower layer 12 made of heat-shrinkable fiber or the heat-shrinkable fiber contained in the lower layer 12, and the upper layer 11 and the lower layer 12 are heat-sealed. At the same time or after heat-sealing both, the intermediate layer 12 is subjected to heat treatment. Thus, by heat-shrinking the lower layer 12 in the horizontal direction, the ridge formability of the convex portions formed in the upper layer 11 and the lower layer 12 is increased, and a bulkier and more comfortable surface sheet 21 can be obtained. . Thus, when laminating | stacking two fiber layers and configuring the surface sheet 21, an interface is formed between the two fiber layers from a viewpoint of making liquid permeability good in the thickness direction of the surface sheet 21 favorable. It is preferable not to.

As the upper layer 11 and the lower layer 12, the web formed by the card method and a bulky nonwoven fabric are used preferably, for example. The web formed by the card method refers to a fiber aggregate in a state before being nonwoven. In short, fibers in a state where fibers are very loosely entangled in a state in which a post-treatment applied to a card web used for producing a nonwoven fabric, for example, heat fusion treatment by an air through method or a calender method, is not performed. Refers to an aggregate. In the case where the web formed by the card method is used as the upper layer 11 and the lower layer 12, the upper layer 11 and the lower layer 12 are bonded to each other at the same time or after the upper layer 11 and the lower layer 12 are bonded. The fibers are heat-sealed. Moreover, as a bulky nonwoven fabric, the constituent fibers of the upper layer 11, which may be an air through nonwoven fabric, an airlaid nonwoven fabric, a resin bond nonwoven fabric, or the like, have substantially no heat shrinkability, or a constituent fiber of the lower layer 12. It is preferable not to heat-shrink below the heat shrinkage temperature of. The basis weight of the upper layer 11 is preferably from 10 to 50 g / m 2, more preferably from 15 to 40 g / m 2, from the viewpoint of forming a sufficient density gradient and from the viewpoint of improving the texture of the surface sheet 21. to be.

As the lower layer 12, the web formed by the card method and the nonwoven fabric which has heat shrinkability can be used. As a constituent fiber of the lower layer 12, what consists of a thermoplastic polymer material and has heat shrinkability is used preferably. Examples of such fibers include latent crimpable fibers. It is preferable that the content rate of the latent crimped fiber in the lower layer 12 is 40-100 weight%. The latent crimped fiber is a fiber having the property of being spirally crimped and contracted by heating at a predetermined temperature before being heated in the same manner as a fiber for a conventional nonwoven fabric.

The latent crimped fiber is composed of, for example, an eccentric core-sheath type or a side-by-side type of composite fiber composed of two kinds of thermoplastic polymer materials having different shrinkage rates. As an example, the thing of Unexamined-Japanese-Patent No. 9-293,25 and patent 2727331 is mentioned. The intermediate layer 12 contains such latent crimped fibers, for example, and simultaneously or after heat fusion of the upper layer 11 and the lower layer 12, expresses the crimps of the fibers by heating to shrink them. You can. The basis weight of the intermediate layer 12 is preferably 10 to 50 g / m 2, more preferably 15 to 40 g / m 2.

Preferably the surface sheet 21 comprised from these upper layer 11 and the lower layer 12 is 20-100 g / m <2>, More preferably, it is 35-80 g / m <2>. Since many uneven | corrugated parts are formed in the surface sheet 21, the sheet | seat 1 is large and bulky.

The surface sheet 21 is not limited to the above-mentioned form, It can change suitably, as long as it does not deviate from the meaning of this invention. For example, the surface sheet 21 may be comprised by the fiber sheet of a three-layered structure. In this case, it is preferable to comprise the intermediate | middle layer 13 by the fiber which has heat shrinkability, and to comprise the upper layer 11 and the lower layer 12 by the fiber which does not have heat shrinkability. Moreover, it is preferable that the basis weight of the upper layer 11 is larger than the basis weight of the lower layer 12 from a viewpoint of improving the permeability of liquid.

[Third embodiment]

Next, another embodiment (third embodiment) of the sanitary napkin of the second embodiment as the absorbent article of the present invention will be described. The sanitary napkin of 3rd Embodiment uses the absorber 3 with the surface sheet 21 of 2nd Embodiment, and protrudes and absorbs more than the area | region B of the recessed part absorption part 34 and the recessed part 31. The area A of 38 has a high basis weight.

In addition, said 1st and 2nd embodiment and this 3rd embodiment do not have independent and exclusive relationship, 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.)

9 is a partially cutaway perspective view showing the sanitary napkin according to the third embodiment in a skin-contacting surface direction. 10 is a cross-sectional view taken along the line II-II shown in FIG. 9. FIG. 11: is a top view which showed typically the absorber of the sanitary napkin shown in FIG. 9 at the non-skin-contacting surface side, and the member other than an absorber was not shown avoiding complicated drawing. In addition, in these figures, in order to avoid the complexity, the core wrap sheet of an absorber is abbreviate | omitted and shown. FIG. 12 is a partial cross-sectional view showing an enlarged portion of a predetermined cross section of the sanitary napkin shown in FIG. 9.

In the sanitary napkin 30 of this embodiment, the absorber 3 is bonded and formed in the skin contacting surface side of the back sheet 2 by an adhesive agent etc., and is arrange | positioned. Moreover, in the outer side of the longitudinal direction left and right of the said absorber 3 in the skin contact surface side of the back sheet 2, the side sheet 4 abuts and joins the back sheet 2, and is attached. In the part where the back sheet and the side sheet contact, the surface sheet 21 is fitted into the back sheet 2 and the side sheet 4, and the surface sheet 21 is absorbed toward the width direction (X direction) inward direction. (3) It is arrange | positioned so that it may be located in the skin contact surface side more. The sheet members thus laminated are joined by heat seals or the like without the absorber 3 outside the absorber 3 to form the outer periphery 6 of the napkin 30. This outer periphery 6 is joined to such an extent that the liquid absorbed once does not leak without impairing the overall elasticity. The free end 41 of the side sheet 4 is provided with a pocket (not shown) that faces the outer periphery 6, and has an effect of preventing side leakage such as a liquid. Moreover, the wing part 42 which has the side sheet 4 extends toward the width direction outward of the sanitary napkin 30 in the width direction left and right both sides of the sanitary napkin 30 in this embodiment, This part is rolled up to the non-skin contact surface side of the crotch part in shorts, and the sanitary napkin 30 is fixed to the shorts.

On the skin-contacting surface side of the sanitary napkin 30, a leak-proof groove 5 compressed from the skin-contacting surface side of the surface sheet 21 over the absorber 3 is formed. As for the shape seen from the plane of the leak prevention groove | channel 5, the crimping part which has a length in the vertical direction is arrange | positioned in the width direction left and right sides of the excretion part correspondence area | regions, such as acupuncture points, in the longitudinal center part of the absorber 3, As each of the left and right compressed portions approaches the front and rear ends of the absorbent body 3, the front and rear ends coincide with each other. In short, the leak-proof grooves 5 are planarly arranged at both sides in the longitudinal direction of the sanitary napkin 30 so that two compressed portions arranged on the skin contacting surface side extend in the front-rear direction to continuously form an endless loop. Shape (see FIG. 9). By doing in this way, the side leak of the excretion liquid at the time of attaching and using a napkin can be prevented effectively. In addition, the excretory part opposing area | region is the part directly receiving excretion, such as acupuncture points or a lobster, and its vicinity. In addition, the shape seen from the plane of the leak prevention groove | channel 5 in this embodiment is not limited to the shape mentioned above, It may mutually intersect at the front end and the rear end of an endless annular form, It is preferable to determine suitably according to a use. Do.

The material, dimensions, etc. of the front sheet 21, the back sheet 2, the side sheet 4, and the absorber 3 are mentioned later. In the present embodiment, the surface sheet 21 has protrusions made of fibers on the skin-contacting surface side and the non-skin-contacting surface side from the viewpoint of quickly absorbing the liquid discharged and delivering it to the absorber and from the viewpoint of good feel. A liquid permeable nonwoven fabric is used. In addition, as the back sheet 2, a moisture-permeable film having air permeability is used as a single layer. The absorber 3 is formed by coating pulp fibers and the like with an absorbent polymer with a core wrap sheet (not shown) such as paper. Moreover, the adhesive (not shown) for fixing the sanitary napkin 30 to a wear is apply | coated to the non-skin-contacting surface side of the back sheet 2. By the adhesive, the sanitary napkin 30 is adhesively fixed to the wearer of the user. The sanitary napkin 30 of this embodiment faces the surface sheet side toward the skin-contacting surface side of a wearer, arranges the longitudinal direction from a lower abdomen to a buttocks, and connects the left and right legs in the width direction. Wear it by placing it in the direction of the line.

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-non-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 in the planar view of the absorbent article is referred to as the longitudinal direction, and the direction orthogonal to the longitudinal direction is referred to as the width direction. In addition, the longitudinal direction typically coincides with the front-rear direction of the human body in a mounted state.

As shown in FIG. 10, the surface sheet 21 of this embodiment is formed by laminating | stacking two fiber layers, the upper layer 11 and the lower layer 12, from the skin contact surface side.

The upper layer 11 and the lower layer 12 are joined by the crimping | compression-bonding by the embossing in the many emboss part 15. As shown in FIG. The upper layer 11 and the lower layer 12 are embossed at the same position in plan view, and are recessed in the embossed portion 15 to form a number of valleys. And the non-emboss part between valley parts, ie, the area | region enclosed by the emboss part 15, forms the protrusion part 14. As shown in FIG. The protrusion part 14a of the upper layer 11 protrudes to the skin contacting surface side, and the protrusion part 14b of the lower layer 12 protrudes to the non-skin-contacting surface side. The protrusions 14a and 14b are regularly arranged in the same position of the upper layer 11 and the lower layer 12 in the same plane as the embossed portion 15 described above, whereby the upper layer ( In the 11) and the lower layer 12, many uneven parts are formed over the whole area | region. And as the whole surface sheet 21, many uneven parts are formed over the whole area | region.

The embossed part 15 which becomes the valley part of the upper layer 11 and the lower layer 12 is a part which the fiber of the surface sheet 21 was condensed, and has a higher fiber density than the protrusion part 14 of the surface sheet 21, Maternal power is high. As a result, the excretion liquid can be effectively and quickly transmitted from the surface sheet 21 to the absorber 3. Specifically, the means described in paragraphs [0007] to [0045] of the specification of JP 2004-166849A can be used.

In this embodiment, each embossing part 15 is substantially cross shape which crossed two long axes. Two adjacent embossed portions 15 and 15 at the shortest distance are disposed so as to exist on a substantially extending line in the major axis direction. As a result, a density gradient of the constituent fibers is formed in the surface sheet 21 between the embossed portion 15 and the protrusions 14 in the multi-direction, and the diffusion of the liquid of the surface sheet 21 and the liquid in the thickness direction. Permeability is improved. The shape and arrangement of the embossed portion 15 may be randomly dotted with round or square embosses in addition to those of the present embodiment, and have a density gradient of the constituent fibers and rapid diffusion of the liquid in the thickness direction. The shape or arrangement to be realized can be arbitrarily employed.

The absorbent body 3 of this embodiment coat | covers the mixed red fiber of pulp fiber and a water absorbing polymer with the core wrap sheet. In the absorber 3, a plurality of recesses 31 recessed in the thickness direction from the non-skin-contacting surface side to the skin-contacting surface side are formed at least in the excretion-part correspondence region. This recessed part 31 is arrange | positioned in each of the longitudinal direction and the width direction of the absorber 3. The arrangement in the longitudinal direction and the width direction means that a plurality of sets of recesses 31 are arranged at predetermined intervals in a plan view of the absorber 3, and the rows of recesses extending in the longitudinal direction are aligned at predetermined intervals in the width direction. The rows of recesses arranged in the width direction are aligned at predetermined intervals in the vertical direction. The rows of the recesses 31 may be continuous or intermittent. In the bottom part of the skin contacting surface side of this recessed part 31, the recessed part absorption part 34 containing a pulp fiber is arrange | positioned. The concave portion 31 arranged in a plurality of longitudinal and horizontal portions and the concave portion absorbing portion 34 corresponding thereto are connected to each other in the thickness direction to form the liquid-permeable structure of the absorber 3. The portion of the absorber 3 sandwiched between the recesses 31 is partitioned into a plurality of block-like protrusion absorbing portions 33 protruding toward the back sheet 2 side. The protruding absorbing portion 33 absorbs and holds the excretion liquid, including pulp fibers and an absorbent polymer. In this embodiment, the shape of each protrusion absorption part 33 is a substantially rectangular shape which has length in the longitudinal direction. Arrangement of the protrusion absorbing part 33 is arrange | positioned in the horizontal and horizontal direction so that it may have predetermined clearance gap s, r (refer FIG. 11) from each other in a natural state seen from the plane seen from the non-skin-contacting surface side of the absorber 3. As shown in FIG. It is. This arrangement is an arrangement in which the projected images overlap in any direction when the plurality of protrusion absorbing portions 33 are projected in the longitudinal direction and the width direction. By the liquid-permeable structure which has the recessed part 31 mentioned above, liquid, such as acupuncture points, is moved to each protrusion absorption part 33 in the non-skin-contacting surface of the absorber 3 which is a position farther from the surface sheet 21. It can keep absorption quickly.

As described above, on the skin surface side of the concave portion 31, a concave portion absorbing portion 34 that is thinner than the protruding absorbing portion 33 is disposed as part of the absorber 3. The portion (upper part) 33a on the skin-contacting surface side of the concave absorbing portion 34 and the protruding absorbing portion 33 extends in the planar direction and the continuous portion 35 on the skin-contacting surface side of the absorber 3. Becomes The continuous part 35 is flat shape with respect to the surface sheet 21. The entire absorbent body 3 including the concave absorbing portion 34 and the protruding absorbing portion 33 has a seamless integral structure. In particular, except for the crimped portion of the leak-proof groove 5 in the excretion corresponding region, the density is substantially substantially uniform throughout. This substantially uniform density means that there is no extremely high density part such as compression by embossing at the time of shaping the absorbent body 3, and it is caused by a minute change in the density of manufacturing or by individual packaging. It is also a meaning to allow a case where there is some density change by the bias of the member at the time of product shipment, such as folding. Moreover, compared with the area | region A (FIG. 10) of the absorber 3 in which the protrusion absorption part 33 is arrange | positioned, the area | region B (FIG. 10) of the absorber in which the recessed part 31 and the recessed part absorption part 34 are arrange | positioned Basis weight is small.

In the absorbent body 3 of the present embodiment, the skin contacting surface side of the absorbent body 3 having the continuous portion 35 has a flat shape, and thus the contact between the surface sheet 21 and the absorbent body 3 is good, and thus the surface sheet The liquid having passed through (21) is likely to be guided to the absorber (3) in a wide range. As the block-shaped protrusion absorbing portion 33 and the recess portion absorbing portion 34 will be described later, the recess portion absorbing portion 34 and the upper portion 33a of the block-shaped protrusion absorbing portion 33 are planar on the skin-contacting surface side. In the boundary region between the recess absorber 34 and the block absorber 33, there is no extreme difference in density seen in conventional compression grooves and the like, and it is approximately uniform density, and the same material as pulp fibers. It is composed of the surface of the skin-contacting surface and is planar in plan view, and the boundary is not visible to the naked eye.

In the liquid passage structure described above, the concave portion absorbing portion 34 does not increase the density and the basis weight decreases because the thickness is thin, so that the liquid-resistance resistance of the liquid is low. Thereby, the recessed part absorption part 34 turns into the coating liquid which suppressed the liquid holding amount, and can draw the liquid from the surface sheet 21 quickly into the absorber 3 inside. The liquid which has passed through the recessed absorber 34 is easily shifted to the upper portion 33a of the projected absorbent portion 33 in the continuous portion 35 in which the boundary area is substantially uniform and the density is uniform. It is quickly accepted by the section 33, and is moved and maintained in the thickness direction. On the other hand, the liquid in the recessed part absorption part 34 is also taken in to the recessed part 31 which is a space part once. The liquid received in the recess 31 is absorbed and held near the lower portion of the protruding absorbing portion 33. Of course, the liquid can also be directly absorbed and held in the part 33a (part of the continuous part 35) of the protruding absorbing part 33. However, when high viscosity liquids such as acupuncture points or the like are excreted in large quantities or repeatedly excreted at one time, the recessed portion absorbing portion 34 pulls quickly even if it cannot be absorbed and retained in the protruding absorbing portion 33 at once. Indentation 31 achieves a buffer function to hold the liquid temporarily. In addition, as described above, the concave portions 31 are connected to each other on the non-skin-contacting surface side of the absorbent body 3, thereby moving the liquid at a position farther from the surface sheet 21 so that each protruding absorbing portion 33 is provided. It can be surely absorbed and maintained at. Thus, by the liquid-permeable structure which consists of the recessed part absorption part 34 and the recessed part 31, a liquid is quickly taken in in the absorber 3 from the surface sheet 21 side, and it is reliably at the protrusion absorption part 33. Absorption can be maintained. As a result, liquid retention at the skin-contacting surface side of the absorber 3 is suppressed, and liquid return to the surface sheet 21 from the absorber 3 is unlikely to occur.

Moreover, with the liquid-permeable structure which consists of the recessed part absorption part 34 and the recessed part 31, even if there exists a pressure of such a thickness direction at the time of the attachment of the napkin 30, the excretion liquids, such as acupuncture points, to the surface sheet 21 side It becomes difficult to return the liquid. This is because the recess portion absorbing portion 34 quickly attracts the recess portion 31 without retaining the liquid, and the liquid once drawn into the recess portion 31 is relatively smaller than the skin-contacting surface side of the absorber 3. The liquid flow structure having the distant position and the concave portion 31 quickly moves the liquid on the non-skin-contacting surface side of the absorber 3 so as to be absorbed and retained in the protruding absorbing portion 33. It is considered that this is caused by a plurality of actions such as not increasing the storage amount. In addition, the pressure applied to the recessed portion 31 is alleviated by the presence of the recessed portion absorbing portion 34, and the movement of the liquid in the liquid-permeable structure having the recessed portion 31 at this pressure is urged. I think. By quickly drawing the liquid into the concave portion 31 without leaving the liquid on the surface sheet 21 side of the absorber 3 in this manner, the return of the liquid to the surface sheet 21 side is effectively suppressed even at the pressure in the thickness direction. A good dry feeling is obtained. Moreover, since the non-skin-surface side of the absorber 3 is uneven | corrugated shape divided by the longitudinal and horizontal recessed part 31, it has flexibility in the part, and the sanitary napkin 30 fits the relief of the skin surface " Body conformity "and" movement followability "which follow the wearer's movement favorably and are prevented from creating a partial gap with respect to skin very much.

In the present invention, the arrangement of the protruding absorbing portions 33 can be appropriately selected according to the use and function in addition to those of the present embodiment. Arrangement with approximately half-pitch shift) in a direction. Moreover, the thing of arbitrary shape can be employ | adopted for the shape of the protrusion absorption part 33 suitably according to a use and a function other than this embodiment. Moreover, you may provide an embossing from the surface sheet side of the said absorber of this invention, and may form a general leak prevention groove | channel.

As the manufacturing method of the absorber 3, for example, a plurality of protrusions 51 formed on the circumferential surface of a red drum or the like are scattered in the air by dispersing an absorber material composed of pulp fibers or pulp fibers and a superabsorbent polymer. It can manufacture using the red threader, the mixed red threader, etc. which are made to suck | stack and accumulate and accumulate in the integrated part of the mold 50 (refer FIG. 5) which has it (not shown).

For example, as shown in FIG. 5, when the protrusion part 51 of FIG. 5 (a) is screened out, and the mixture of the pulp fiber 61 and the absorbent polymer 62 is integrated, and gradually deposited, FIG. 5 (b) As shown in FIG. 5C, the absorber precursor 70 is accumulated over the height of the protrusion 51. The portion 74 deposited on the protruding portion 51 becomes the recessed portion absorbing portion 34 of the absorber 3, and the portion 71 having the protrusion powder 51 is the recessed portion 31 of the absorber 3. Becomes The portion 73 deposited on the concave portion of the projection period becomes the protruding absorbing portion 33 of the absorber 3. The portion 75 integrally accumulated higher than the protrusions 51 serves as the continuous portion 35 of the absorber 3. The mixed red fiber of the pulp fiber and the absorbent polymer thus formed is covered with a core wrap sheet (not shown) made of paper such as tissue paper, various nonwoven fabrics, and the like to obtain the absorbent body 3.

The concave absorber 34 and the protruding absorber 33 of the absorber 3 integrally formed in this way are formed without applying compression or the like, so that the fiber density does not increase, and the absorber 3 has a substantially uniform density. Has Moreover, since the recess absorption part 34 is thin in thickness, a basis weight is lower than the protrusion absorption part 33. FIG. Unlike the formation by pressing of embossing or the like, the recess absorbing portion 34 has a low liquid resistance and easily transitions to the thickness direction of the liquid. Moreover, since the absorber 3 integrally formed in this way does not have a part hardened by crimping | compression-bonding, such as embossing, a texture improves. When the napkin 30 having the absorbent body 3 is attached, there is no part that firmly touches the surface sheet 21 so that the softness of the absorbent body 3 can be realized, and at the portion of the recess 31, Since it has sex, it fits in a body and a favorable feeling of wearing is obtained.

Thus, the recessed part absorbing part 34 suppresses the holding amount of liquid, and moves the liquid to the recessed part 31 quickly, and the recessed part 31 has the function of temporary storage of excretion liquid, and the surface sheet 21 side in order not to return the liquid station, a ratio (%) of the depth (h ₂₎ (the thickness of the projected absorbing unit 31) of the absorber (3) the thickness of the (h ₁₎ of the recess portion 31 (Fig. 10 Reference) is preferably 40 to 98%, particularly 30% to 70%, more preferably 40% to 60%. By using more than the said lower limit, liquid retention to a surface sheet and liquid return can be suppressed more effectively, and by using below an upper limit, the liquid accepted from the surface sheet can be moved to the protrusion absorption part 33 without spreading too much. For the same reason, the constituent material having a basis weight (w ₁₎ of the recess absorbing portion 34 and the concave domain B having a 31 (see Fig. 10), 30 ~ 160 g / ㎡ is desirable, and 50 to 150 It is more preferable that it is g / m <2>. A basis weight of the region having a protruding absorption part 33 (see Fig. 10) (w ₂₎ is 180 ~ 400 g / ㎡ which it is desirable and is more preferably, 200 ~ 300 g / ㎡. In addition, the basis weight ratio (w ₁ / w ₂ ) of both is preferably 0.1 to 0.8, more preferably 0.3 to 0.6.

In the present invention, the concave portion 31 is a portion which is recessed from the bottom of the absorber 3 toward the skin-contacting surface side and becomes a void. The recess absorption part 34 is a part of the absorber 3 located in the upper part of the recess part 31, and is partitioned by the virtual line s and s extended in the thickness direction from the wall bottom part 31a, 31a. Part of the absorbent body 3 (see FIG. 12). The protruding absorbing portion 33 is a portion of the region A from the top to the bottom of the absorber surrounded by the region B, adjacent to the region B of the recess 31 and the recess absorbing portion 34 lined in the thickness direction (FIG. 10 and FIG. 12).

The thickness of the recess absorbent panel 34 is defined in this way (h ₃₎ the measurement of the thickness (h ₁₎ of the projected absorbing unit 33, size 37 ㎜ × 37 ㎜, absorbent core of an acrylic plate having a thickness of 3 ㎜ (10) laying on, and measuring the thickness (h ₁₎ of KEYENCE Co., Ltd. non-contact laser displacement meter projected absorbing unit 33 to use the (laser head LK-G30, displacement gauge LK-GD500) includes an upper (33a) The thickness (h ₃ ) of the recessed portion absorbing portion 34 was measured by using a microscope VHX-1000 manufactured by KEYENCE Corporation of the cross section corresponding to FIG. 10 of the absorber.

Further method of measuring the basis weight (w ₂₎ of basis weight (w ₁₎ and protruding absorption part 33 of the recess absorbing portion 34, FEATHER manufactured against pressing the razor (fader razor S pyeonnal), the concave portion recess Calculate the basis weight by cutting the absorber 34 and dividing it by the area of the cut part by measuring the weight, and dividing the projected absorber 33 including the upper part 33a by weight and dividing by the area of the cut part. did.

In the present embodiment, the absorbent polymer inside the absorbent body 3 exists uniformly, but in order to more effectively suppress the return of the liquid, the absorbent polymer is more than the continuous portion 35 including the recessed absorber 34. It is preferable to arrange a lot in the part of the downward protrusion absorption part 33 conveniently, and the non-skin part in the protrusion absorption part 33 is not arrange | positioned at the continuous part 35 containing the recessed part absorption part 34. It is more preferable to arrange a lot on the surface side. Moreover, it is also preferable to arrange | position the water absorbing polymer in the non-skin-surface side of the recessed part 31.

Moreover, in the absorber 3 of this embodiment, it is preferable that the liquid-permeable structure which has the recessed part 31 is arrange | positioned to the part of the width direction outer side of the leak prevention groove 5, and is arrange | positioned. This arrangement reduces the product bending stiffness in the width direction of the product, makes it easier to deform to fit the curve of the wearer's body from the groin to the buttocks, and is easy to cause side leakage. Flexibility is also given to the sides, and the crotch of the wearer can be fitted, thereby following the movement of the wearer's body and preventing the formation of a gap.

Here, the characteristic of the dynamic action of the partitioned absorber 3 and the surface sheet 21 which were mentioned above in the sanitary napkin 30 of this embodiment is demonstrated in detail based on FIG. FIG. 12 is a partial cross-sectional view showing an enlarged portion of a predetermined cross section of the sanitary napkin shown in FIG. 9. FIG. In addition, the back sheet 2 and the side sheet 4 are not shown in order to avoid the trouble of drawing, The shape of the surface sheet 21 is schematically represented, and the shape shown necessarily in the implementation of this invention is shown. It does not have to be the same shape.

As described above, the surface sheet 21 of the present embodiment has high mobility of the liquid in the thickness direction of the liquid excreted by the capillary force using the gradient of density, so that the liquid excreted from the body is quickly absorbed (3). ) Moreover, since the projection part 14a of the upper layer 11 and the projection part 14b of the lower layer 12 are formed in the same position in the thickness direction (refer FIG. 12), it is easy to move so that a liquid may gather at one point in plan view. Even if the amount of liquid is small, it is preferable because it is led to the absorber 3 and is effectively transmitted to the absorber 3 side. In particular, when the fiber density is different in the upper layer 11 and the lower layer 12, and the fiber density of the lower layer is high, the liquid tends to stay on the lower layer side of the surface sheet, but the liquid concentrates, thereby providing a structure of the surface sheet. It is effective in improving the dry feeling by shielding property and low liquid returnability. As described above, the absorber 3 has a plurality of recesses 31 on the non-skin-contacting surface side, and the recesses absorbing portion 34 is disposed on the skin-contacting surface side. The recess absorber 34 has a lower liquid permeation resistance than the other absorber portions, and the liquid a ₁ disposed using this portion as the chamber is quickly absorbed toward the thickness direction of the absorber 3. And the liquid on to the implementation in the thickness direction of the absorbent body 3 has a portion thereof is a transition solution (a ₂₎ toward the projected absorbing unit (33, 33) near the other Accepted portion is received in the recess 31 Becomes the stock solution (a ₃ ). In this way, the liquid transmitted from the surface sheet 21 is drawn in the recess absorbing portion 34, and a ₂ By dispersing at A ₃ , the holding amount at the surface side of the absorber is reduced, and the resistance to flow is further lowered. Thereby, the liquid return to the surface sheet 21 can also be suppressed effectively.

Thus, the sanitary napkin 30 in this embodiment has the performance of the surface sheet 21 which has the high permeability of the liquid in the thickness direction, and the high thickness direction of the absorber 3 with the recessed part 31. FIG. By the permeability of the liquid to be able to be exhibited sufficiently, thereby suppressing the return of the liquid to the skin of the moisture received, thereby exhibiting the effect of imparting a desirable dry feeling to the user.

The magnitude | size and shape of the protrusion absorption part 33 and the recessed part 31 which concern on this embodiment are not specifically limited. Although somewhat different also depending on the use of the absorbent article to be used, the longitudinal length k ₁ (see FIG. 11) of the protruding absorbing portion 33 is curved toward the skin-contacting surface by gradually absorbing the concave portion toward the skin. From the viewpoint of urging deformation along the shape of the wearer's body, 10 to 30 mm is preferable, and 15 to 25 mm is more preferable. The width direction length k ₂ is preferably 5 to 20 mm, and more preferably 7 to 15 mm from the viewpoint of relieving the compressive force from the width direction applied to the absorber while the recess is worn. Moreover, 1-5 mm is preferable and, as for the longitudinal direction length s of the recessed part 31, 1-3 mm is more preferable. 1-5 mm is preferable and, as for the width direction length r, 1-3 mm is more preferable.

The material of the surface sheet 21 and its preferable manufacturing method are described below.

The surface sheet 21 is made of, for example, an upper layer 11 made of a non-heat shrinkable fiber material or a fiber having a higher heat shrink temperature than a lower layer fiber, and a lower layer made of a heat shrinkable fiber material before shrinkage having a higher heat shrink temperature than an upper layer fiber ( 12).

The upper layer 11 and the lower layer 12 are partially or entirely fused in a predetermined pattern by embossing such as heat, and then heat is applied to thermally shrink the lower layer 12 in the horizontal direction. Then, since the upper layer 11 and the lower layer 12 are embossed, when the lower layer 12 shrinks, the upper layer 11 is integrated with the lower layer 12 by embossing, so that the upper layer 11 and the lower layer 12 are reduced. . However, the upper layer 11 is deformed because heat shrinkage does not occur or the heat shrinkage is smaller than that of the lower layer 12, and this strain appears as a convex bump in the upper layer 11. At the same time, the lower layer 12 is convexly raised in the lower layer 12 from the point of strain transfer of the upper layer 11 to the lower layer 12 side. In detail, heat fusion by thermal embossing, for example, the upper layer 11, the embossed surface (such as the circumferential surface of the embossing roll) formed with a plurality of embossed pins having a predetermined shape arranged in a predetermined pattern, The upper layer 11 and the lower layer 12 side in the laminate of the lower layer 12 are pressed into contact, and the constituent fibers of the upper layer 11 and the lower layer 12 are melted at the site pressed by each fin. do. The protrusion part 14 formed by the upper layer 11 and the lower layer 12 may have the part extended so that the emboss part may be covered.

The thermal contraction of the lower layer 12 comprises, for example, the lower layer 12 made of heat-shrinkable fibers, or the heat-shrinkable fiber contained in the lower layer 12, and the upper layer 11 and the lower layer 12 are heat-sealed. At the same time or after heat-sealing both, the intermediate layer 12 is subjected to heat treatment. Thus, by heat-shrinking the lower layer 12 in the horizontal direction, the ridge formability of the convex portions formed in the upper layer 11 and the lower layer 12 becomes high, and the bulky and comfortable surface sheet 21 can be obtained. . Thus, when laminating | stacking two fiber layers and configuring the surface sheet 21, an interface is formed between the two fiber layers from a viewpoint of making liquid permeability good in the thickness direction of the surface sheet 21 favorable. It is preferable not to.

As the upper layer 11 and the lower layer 12, the web formed by the card method and a bulky nonwoven fabric are used preferably, for example. The web formed by the card method refers to a fiber aggregate in a state before being nonwoven. In short, fibers in a state where fibers are very loosely entangled in a state in which a post-treatment applied to a card web used for producing a nonwoven fabric, for example, heat fusion treatment by an air through method or a calender method, is not performed. Refers to an aggregate. In the case where the web formed by the card method is used as the upper layer 11 and the lower layer 12, the upper layer 11 and the lower layer 12 are bonded to each other at the same time or after the upper layer 11 and the lower layer 12 are bonded. The fibers are heat-sealed. Moreover, as a bulky nonwoven fabric, the constituent fibers of the upper layer 11, which may be an air through nonwoven fabric, an airlaid nonwoven fabric, a resin bond nonwoven fabric, or the like, have substantially no heat shrinkability, or a constituent fiber of the lower layer 12. It is preferable not to heat-shrink below the heat shrinkage temperature of. The basis weight of the upper layer 11 is preferably from 10 to 50 g / m 2, more preferably from 15 to 40 g / m 2, from the viewpoint of forming a sufficient density gradient and from the viewpoint of improving the texture of the surface sheet 21. .

As the lower layer 12, the web formed by the card method and the nonwoven fabric which has heat shrinkability can be used. As a constituent fiber of the lower layer 12, what consists of a thermoplastic polymer material and has heat shrinkability is used preferably. Examples of such fibers include latent crimpable fibers. It is preferable that the content rate of the latent crimped fiber in the lower layer 12 is 40-100 weight%. The latent crimped fiber is a fiber having the property of being spirally crimped and contracted by heating at a predetermined temperature before being heated in the same manner as a fiber for a conventional nonwoven fabric.

The latent crimped fiber is composed of, for example, an eccentric core-sheath type or a side-by-side type of composite fiber composed of two kinds of thermoplastic polymer materials having different shrinkage rates. As an example, the thing of Unexamined-Japanese-Patent No. 9-293,25 and patent 2727331 is mentioned. The intermediate layer 12 contains such latent crimped fibers, for example, and simultaneously or after heat fusion of the upper layer 11 and the lower layer 12, expresses the crimps of the fibers by heating to shrink them. You can. The basis weight of the intermediate layer 12 is preferably 10 to 50 g / m 2, more preferably 15 to 40 g / m 2.

The basis sheet 21 composed of these upper layers 11 and lower layers 12 is preferably 20 to 100 g / m 2, more preferably 35 to 80 g / m 2. Since many uneven | corrugated parts are formed in the surface sheet 21, the sheet | seat 1 is large and bulky.

The surface sheet 21 is not limited to the above-mentioned form, It can change suitably, as long as it does not deviate from the meaning of this invention. For example, the surface sheet 21 may be comprised by the fiber sheet of a three-layered structure. In this case, it is preferable to comprise the intermediate | middle layer 13 by the fiber which has heat shrinkability, and to comprise the upper layer 11 and the lower layer 12 by the fiber which does not have heat shrinkability. Moreover, it is preferable that the basis weight of the upper layer 11 is larger than the basis weight of the lower layer 12 from a viewpoint of improving the permeability of liquid.

The formation material of the member which comprises the sanitary napkins 10, 20, and 30 of this embodiment is demonstrated below.

As a forming material of the surface sheet 1, the back sheet 2, the absorber 3, and the side sheet 4, what is employ | adopted for this kind of article can be used without a restriction | limiting in particular. For example, as the surface sheet 1, a composite sheet in which various nonwoven fabrics (for example, an air through nonwoven fabric, a spanbonded nonwoven fabric, etc.) are superimposed, or a laminated sheet formed of a laminate of a nonwoven fabric and a film, etc., is formed. This is used. Moreover, it may consist of three layers of an upper layer, a middle layer, and a lower layer as a surface sheet, and the upper layer and the lower layer may be joined to the flat middle layer as a shape with the ups and downs of the condensed part by the protrusion part and the embossing.

The side sheet 4 is preferably a water-repellent nonwoven fabric, and is water-repellent from a nonwoven fabric, a spanbond nonwoven fabric, a meltblown nonwoven fabric, a spanlace nonwoven fabric, a heatroll nonwoven fabric, a needle punch nonwoven fabric or the like produced by the card method, or a water repellent treatment. Various nonwovens can be used. Particularly preferably, for example, a spanbond nonwoven fabric, a spanbond-meltblown (SM) nonwoven fabric, a spanbond-meltblone-spunbond (SMS) nonwoven fabric, and the like are used.

Although there is no restriction | limiting in particular as a constituent material of the absorber 3, A fiber material, a porous body, their combination, etc. can be used. Examples of the fibrous material include steps made of natural fibers such as wood pulp, cotton, and hemp, polypropylene resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, and synthetic resins such as polyvinyl alcohol resin. Fibers, composite fibers containing two or more of these resins, and semisynthetic fibers such as acetate and rayon can be used. When using the fiber which consists of synthetic fibers, the fiber may be a heat shrink fiber whose shape changes with heat. For example, although fineness becomes large by heat but fiber length becomes short, fineness hardly changes with heat, but the length which the fiber of an external appearance occupies may be shortened as shape changes to coil shape. As the porous body, a sponge, a nonwoven fabric, an aggregate of a super absorbent polymer (the aggregate of a superabsorbent polymer and a fiber) and the like can be used.

As the back sheet 2, a moisture-permeable film alone, a non-moisture-permeable film alone, or a combination of a film and a nonwoven fabric, and a water-repellent nonwoven fabric (such as SMS or SMMS) can be used. It is most preferable to use a moisture-permeable film or a non-moisture-permeable film alone as a leak prevention material in matching with a misalignment prevention adhesive. As the moisture-permeable film material, a film obtained by stretching a thermoplastic resin and an inorganic filler which is not compatible with this and melt-kneaded and extruded to a predetermined dimension to penetrate fine pores, or inherently high water compatibility, Likewise, a nonporous film capable of discharging water vapor may be mentioned. In order to fully express the performance of the humidity discharge according to the present invention and to implement a leak-proof layer without spreading moisture, the water vapor transmission rate is preferably in the range of 0.7 to 3.0 g / 100 cm 2 hr, and 1.0 to 2.5. It is more preferable to exist in the range of. It is most preferable to exist in 1.5-2.5 from a viewpoint of fully raising a refreshing feeling. Moreover, in order to be able to use it without troubles, such as a tear of a film, a film basis weight is 18-70 g / m <2>, More preferably, it is 25-60 g / m <2>. Moreover, the preferable inorganic filler compounding quantity is 30-65 mass% as mass% of a filler with respect to the mass of the whole film, More preferably, it is 40-60 mass%.

As described above, the absorbent article of the present invention is absorbed through the concave absorbent portion of the absorbent portion and the skin-contacting surface side portion of the protruding absorbent portion by having the absorbent member having the above structure, and is quickly drawn while being diffused in the planar direction to form a block shape. The liquid is absorbed and held (fixed) in the protruding absorbing portion. In the liquid-permeable structure disposed in the longitudinal and horizontal direction of the absorber, the recess absorber is located on the skin contacting surface side of the recess (recession), whereby the recess absorber is urged to shift rather than the retention of the liquid, so that the liquid is quickly absorbed. Easy to be absorbed in In the said recessed part, the liquid which passes through a recessed part absorption part can be temporarily hold | maintained, and liquid retention on the surface sheet side is suppressed. The liquid retained in the recess is absorbed and retained at the non-skin-contacting surface side of the protruding absorbing portion, so that liquid return hardly occurs. In this way, the liquid can be reliably absorbed and held in each of the protruding absorbing portions on the plurality of blocks that are dispersed and arranged through the liquid passage structure. In addition, as in the second embodiment, the protrusion on the back side of the surface sheet facilitates the liquid transfer to the absorber, and also prevents the wet bag from which the liquid once transferred to the absorber returns to the skin side. That is, the combination of the surface sheet which has a regular protrusion, and the absorber which has a liquid-permeable structure which consists of a recessed part and a recessed part absorption part is excellent in liquid permeability in the thickness direction, and it becomes possible to maintain a reliable absorption of a liquid.

In this invention, the structure of the high density area | region 38 and the low density area | region 39 of the absorber, and the liquid-permeable structure which consists of the recessed part 31 and the recessed part absorption part 34 are carried out to the whole longitudinal direction like this embodiment. It is not limited to arrange | positioning, You may arrange | position to only the excretion part correspondence area | region. The absorbent article of the present invention is not limited to the above embodiment, and the present invention can be adapted to this kind of sanitary napkin, for example, incontinence pad, incontinence liner, and the like. Moreover, it is not only limited to acupuncture points, but it is also effective also in urine, a crayfish, a stool. Moreover, in addition to the surface sheet 1 and 21, the absorber 3, the back sheet 2, and the side sheet 4, you may contain a member suitably according to a use and a function. In addition, the conditions in the material, the manufacturing method of the surface sheets 1 and 21 of the sanitary napkin of the said embodiment, the absorbent body 3, and the back sheet 2, and the dimension proposal of a product are not specifically limited, Various materials used in normal sanitary napkins and the like can be used.

Example

EMBODIMENT OF THE INVENTION Although this invention is demonstrated in more detail based on an Example below, this invention is not limited and interpreted by this.

Example 1

In the accumulating portion having longitudinally and equally arranged protrusions formed on the circumferential surface of the red thread drum of the red thread, the mixture of pulp fibers and the superabsorbent polymer is sucked and deposited, and the absorber total pulp basis weight is 200 g / m 2, the absorber total high Red fibers of pulp fibers and superabsorbent polymers having an absorbent polymer basis weight of 52 g / m 2 were obtained (FIG. 5 (c)) (total pulp basis weight and total superabsorbent polymer basis weight are basis weights including the entire uneven portion). This red thread was coated with a core wrap sheet, passed between a pair of press rolls, and the absorber obtained by compressing at a pressure of 3.0 kgf / cm 2 was used as Sample 1 of Example 1. In this sample 1, the average density (m ₂ ) of the protrusion absorbing portion 33 as the high density region 38 is 0.12 g / cm 3, and the average density of the recessed portion absorbing portion 34 as the low density region 39 ( m ₁ ) was 0.08 g / cm 3. The average basis weight w ₂ of the high density region 38 was 240 g / m 2, and the average basis weight w ₁ of the low density region 39 was 100 g / m 2. The thickness of the recess absorbent panel (34) ₍₃ h) is 1.2 ㎜, and was is 2.0 ㎜ thickness (h ₁₎ of the projected absorbing unit (33). The longitudinal length k ₁ of the protrusion absorbing portion 33 is 20 mm and the widthwise length k ₂ is 10 mm, and the longitudinal length s of the recess 31 is 2.0 mm and the widthwise length ( r) was 1.0 mm.

The absorber was removed from the commercial sanitary napkin from Kao Corporation (trade name "Lorie F. Daytime-for ordinary blade"), and the sample 1 of the absorber described above was disposed at the position of the removed absorber, and the other was restored. And a sanitary napkin for evaluation were obtained. The surface sheet of the commercial sanitary napkin consists of a nonwoven fabric of the following structure.

Nonwoven fabric: The laminated nonwoven fabric of the two-layered structure which has an upper and lower fiber layer, and an upper layer consist of 100% of the sheath type | mold composite fiber which makes a polyethylene terephthalate the core and polyethylene as a sheath, and the lower layer is a latent spiral crimping fiber ( NBF-L (V) fiber manufactured by Yamato Spinning Co., Ltd. and polyethylene as the core and polypropylene as the sheath, and a core-sheath type composite fiber which expresses spiral crimp by heating. The weight ratio (upper layer / lower layer) of the upper and lower layers is 50/50. The upper and lower layers are joined by a dot-shaped embossed portion arranged in a scattered shape, and the latent crimped fibers in the lower layer are in a state in which shrinkage is expressed by heating.

Comparative Example 1

The commercially available sanitary napkin of Kao Corporation was used as the sanitary napkin of the comparative example. In the absorbent body (sample 2) of this commercial sanitary napkin, a circular embossed part having a diameter of 2 mm was formed in a zigzag shape over the whole area. The pitch between the center points of the embossed portions is 7 mm. The basis weight (apparent weight) was 250 g / m 2.

In addition, as Reference Examples and Comparative Examples 2 to 4, samples 3 to 6 of absorbers having a cross section as shown in Figs. 13A to 13D were evaluated as being applied to the commercially available sanitary napkin.

[Reference Example]

In an integrated part having projections arranged on the circumferential surface of the red fiber drum of the red fiber drum in the longitudinal and horizontal intervals, the mixture of pulp fibers and the absorbent polymer is suction-deposited, and the basis weight of the protruding absorber 240 g / m 2 and the concave absorber 115 g / m 2 of pulp fibers and red fiber of the absorbent polymer were obtained (FIG. 13 (a)). The absorber obtained by coating this red fiber with a core wrap sheet was used as the sample (sample 3) of Example 1. What consisted of a pulp fiber and a super absorbent polymer was used, and the protrusion part used what is 20 mm (length direction) x 10 mm (width direction).

Comparative Example 2

The depth h ₂ of the recess in the absorbent body of the present embodiment is 30% of the absorber thickness (protrusion absorber thickness), the basis weight of the protruding absorbent portion is 240 g / m 2, and the basis weight of the recessed absorber is 160 g. Except having set it as / m <2>, an absorber was obtained like Example 1 including the dimension and it was set as the sample (sample 4) of the comparative example 1 (refer FIG. 13 (b)).

[Comparative Example 3]

An absorbent body was obtained in the same manner as in Example 1 except that the absorbent body was not formed with a recess, except that the total basis weight of the absorbent body was 200 g / m 2, including the dimensions, to give a sample (sample 5) of Comparative Example 2 (FIG. 13 (c)).

[Comparative Example 4]

It pressed by the pin embossing from the non-skin-contacting surface side of the absorber of the comparative example 2, and the high pressure bonding part 35 was formed in the skin-contacting surface side. Except for the above, the absorber was obtained in the same manner as in Example 1 including the dimensions, to obtain a sample of Comparative Example 3 (sample 6) (see FIG. 13 (d)).

[Performance evaluation]

<1> About the said Example, Comparative Examples 1-4, and a reference example, 3 g of blood were injected into the sanitary napkin three times at 3 minute intervals from the surface sheet side, and it evaluated in 25 degreeC environment. About the supernatant fluid return evaluation, horse blood injection amount was carried out at the time of cumulative 6 g absorption, and the diffusion area of the liquid was performed by the area after 9 g absorption of horse blood. In addition, horse blood was used as the blood to be injected into the napkin. More specifically, horse defiber blood manufactured by Nippon BioTest Laboratory Co., Ltd. was used. The viscosity of this mortal fiber blood was less than 15 mPa * S in the measurement (measurement temperature 25 degreeC, rotor L adapter) by the (B type) viscometer TVB-10M by Toki Sangyo Co., Ltd. product. The same used horse blood was used for both the Example and the comparative example.

<2> Measurement method of surface layer liquid return amount

3 g of horse blood is injected using a liquid injection plate having a opening diameter of 10 mm. After 1 minute from the liquid injection, the weighed tissue was placed on the napkin surface, a 125 g metal plate was further placed thereon, and pressed for 5 seconds (pressure 4.5 g / cm 2) to measure the amount of liquid absorbed in the tissue. do. In addition, the liquid amount adhered to the napkin contact surface of the injection plate was also measured, and the total value of both was taken as the surface layer liquid return amount at the time of 3 g injection of blood. After 3 minutes from the first injection, 3 g of hemostasis was injected again, and the same operation was repeated 1 minute after the injection, and the amount of supernatant return at the time of 6 g of cumulative hemorrhage was used. Again, 3 g of bleeding blood was injected, and the same operation was repeated 1 minute after the injection, to obtain the amount of the supernatant return when 9 g of cumulative bleeding was injected.

<3> Measurement method of liquid diffusion area

The liquid diffusion area in the surface layer (surface sheet side) of the absorber of the napkin (after 6g injection of blood) provided in surface layer return evaluation was measured using the image analysis apparatus, and it was set as the liquid diffusion area.

The evaluation results are shown in Table 1 below.

〔How to measure〕

The sanitary napkin is placed horizontally, and the base plate is laminated with an acryl plate with a cylinder with an inlet of 1 cm in diameter, and 3 g of defiber hemorrhage (manufactured by Nippon Biotest Co., Ltd.) is injected from the inlet, and 1 minute after infusion. It stayed that way. Next, the acrylic plate with a cylinder was removed, and 16 sheets of absorbent paper (commercially available tissue paper) having a basis weight of 13 g / m 2 were stacked on the surface of the surface sheet at a length of 6 cm x 9.5 cm. Moreover, the weight was put on it so that it might become 4.0 * 10 <^2> Pa, and it pressed for 5 second. After pressurizing, the absorbent paper was taken out, the weight of the paper before and after pressurization was measured, the weight of the defiber bleeding blood absorbed by the paper was measured, and it was set as surface liquid residual amount.

The evaluation results are shown in Table 1 below.

As is clear from the results shown in Table 1, it is clear that the absorber of the example has a reduced liquid diffusion area, less liquid return, and hard to wet back the skin.

〔flexibility〕

The sanitary napkin of Example 1 and a comparative example was fixed to the shorts, and it attached to the female human model. When the pressure sensor ("pressure sensor element" manufactured by Pressure Profile System Co., Ltd.) was inserted into the inguinal part of the human body model, and the leg of the female human body model was bent inward, a 25 mm x 25 mm The maximum value of the pressure detected in the pressure detection range was calculated | required.

As a result, the maximum pressure applied to the model inguinal part of the sanitary napkin of Example 1 was 0.7 kPa, and the maximum pressure applied to the model inguinal part of the sanitary napkin of a comparative example was 1.4 kPa.

From this result, compared to the sanitary napkin of the comparative example, the sanitary napkin of Example 1 has a low pressure on the inguinal part of the wearer when the leg attaching operation is performed at the time of wearing, and the wearer feels by wearing the sanitary napkin. There was little sense of incongruity, and it turned out to provide a more comfortable wearing feeling.

[Twist prevention property]

The sanitary napkin of Example 1 and a comparative example was fixed to the shorts, and it attached to the dynamic model of a human body. As a result of observing the cross section along the width direction of the sanitary napkin after giving the dynamic model a walking motion for 30 minutes, the absorbent body of the sanitary napkin of the comparative example had the cross section bent in an M shape, The absorber was bent in a substantially trapezoidal shape in the state where the center part of the width direction was kept relatively flat, and there was almost no recess in the center of the width direction like a comparative example.

From these results, it turned out that the sanitary napkin of Example 1 is high in torsion prevention property and excellent also in the fitting property with respect to the wearer's skin compared with the sanitary napkin of a comparative example.

While the present invention has been described in conjunction with the embodiments thereof, we do not intend to limit our invention in any detail of the description unless specifically indicated to the contrary, and are broadly interpreted without departing from the spirit and scope of the invention as set forth in the appended claims. I think it should be.

This application claims priority based on Japanese Patent Application No. 2010-282455 for which it applied for patent in Japan on December 17, 2010, and Japanese Patent Application 2010-282456 for which it applied in Japan on December 17, 2010, They hereby take their content as part of the description herein.

1: surface sheet
2: back sheet
3: absorber
31: recess
33: protruding absorption part
34: recessed absorber
4: side sheet
5: leak prevention groove
10: sanitary napkin

Claims (7)

A longitudinally long 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 disposed between both sheets,
The absorbent body has a longitudinal direction and a width direction orthogonal to this, and in a region corresponding to the excretion portion, in the respective directions of the longitudinal direction and the width direction of the absorbent body, the recessed groove shape is formed in the thickness direction from the non-skin-contacting surface side. And the liquid-permeable structure comprised of the recessed part absorption part containing the recessed part of the recessed part, and the pulp fiber of the bottom part on the skin-contacting surface side of the recessed part, and it protrudes to the non-skin-contacting surface side in the area | region enclosed by the fluidizing structure, It is provided with a block-like protrusion absorption part which has a higher basis weight than the said recess part absorption part including pulp fiber,
The recessed absorbent portion of the liquid passage structure is low density, and the protruding absorbent portion on the block is relatively high density. The method of claim 1,
The average density of the constituent members of the recessed absorber is 0.02 to 0.09 g / cm 3, and the average density of the constituent members of the projected absorbent portion is 0.10 to 0.25 g / cm 3. 3. The method according to claim 1 or 2,
The depth in the thickness direction of the said groove-shaped recessed part of the said absorber is 40%-98% of the thickness of the said block-shaped protruding absorbent part. The method according to any one of claims 1 to 3,
The said surface sheet has many parts which protrude regularly at the skin contacting surface side and the non-skin-contacting surface side, The protrusion part is arrange | positioned at the same position on the skin-contacting surface side and the non-skin-contacting surface side. The method according to any one of claims 1 to 4,
The absorbent article contains an absorbent polymer, and the absorbent polymer is conveniently disposed on the non-skin-contacting surface side of the protruding absorbent portion. The method of claim 5, wherein
An absorbent article having a superabsorbent polymer disposed in the recessed absorbent portion. 6. The method according to any one of claims 1 to 5,
An absorbent article, wherein the absorbent article is a sanitary napkin.

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