KR20080018797A - Absorbent articles - Google Patents

Abstract

An absorbent article is provided to make it difficult that the body fluid absorbed in an absorbent layer leaks from the main edge portion of rear flaps. An absorbent article(1) comprises an absorbent body(2) and a couple of rear flaps(3). The absorbent body includes a body absorbing body and a body leakage preventing layer. The rear flaps are formed outwardly on both sides portions of the rear of the absorbent body in a transversal direction. The rear flap includes a flap absorbent layer(31) and a flap leakage preventing layer. The surface of the flap leakage preventing layer on the side of the flap absorbent layer has concave and convex structure. The flap absorbent layer includes a flat surface sheet and a flap absorbent body.

Description

Absorbent article {ABSORBENT ARTICLES}

The present invention relates to absorbent articles such as sanitary napkins, panty liners, incontinence pads, and the like.

An absorbent article such as a sanitary napkin includes an absorbent body having an absorbent layer and a leakage preventing layer, and a pair of rear flaps extending outward in the width direction on each side of the absorbent body. The rear flap is used by being attached to underwear such as panties without being folded in a state produced by the absorbent body, and is different from the wing portion that is folded and used on the outer surface side of the crotch of the underwear.

In addition, in the sanitary napkin having a rear flap, an absorbent layer (hereinafter referred to as a "flap absorbing layer") is formed on the rear flap, and the body fluid overflowed from the absorbent body can be absorbed in the rear flap, thereby providing the entire sanitary napkin. Techniques for improving leakage resistance are known (see, for example, Japanese Patent Application Laid-Open No. 2000-189459).

However, in the sanitary napkin of Japanese Patent Laid-Open No. 2000-189459, the size of the space between the flap absorbing layer and the flap leakage preventing layer (the leakage preventing layer forming the lower surface of the rear flap) is very small. Therefore, in the rear flap, after the body fluid absorbed by the flap absorbing layer moves in the thickness direction, it is easy to excessively diffuse the space between the flap absorbing layer and the flap leak preventing layer by the capillary force. The body fluid once absorbed by the absorbent layer is likely to leak from the periphery of the rear flap. This phenomenon occurs particularly remarkably when the liquid diffusion property of the flap absorption layer is low.

Accordingly, an object of the present invention is to provide an absorbent article having a back flap provided with an absorbing layer, wherein the body fluid absorbed by the absorbing layer is less likely to leak from the periphery of the back flap.

The present invention is an absorbent article having a substantially longitudinal absorbent body having a body absorbent layer and a body leakage preventing layer, and a pair of rear flaps extending outward in the width direction at each of both sides of at least the rear part of the absorbent body, The rear flap is provided with a flap absorbing layer and a flap leak preventing layer, and the flap leak preventing layer achieves the above object by providing an absorbent article having a concave-convex structure on the side of the flap absorbing layer side.

According to the present invention, in an absorbent article having a rear flap provided with an absorbing layer, the body fluid absorbed by the absorbing layer is less likely to leak out from the periphery of the rear flap.

EMBODIMENT OF THE INVENTION Hereinafter, the absorbent article of this invention is demonstrated, referring drawings based on the preferable embodiment (1st embodiment).

The absorbent article according to the first embodiment is a sanitary napkin 1, and as shown in Figs. 1 to 3, the absorbent body in the substantially longitudinal direction is provided with the main body absorbing layers 21 and 23 and the main body leakage preventing layer 22. (2) and a pair of rear flaps 3 and 3 extending outward in the width direction at each of at least both side portions of the rear portion B in the absorbent body 2 and the front in the absorbent body 2. Each of the two sides of the portion A has a pair of wings 4 and 4 extending outward in the width direction.

In the absorbent body 2, the "front part A" means the part located in the front side of a wearer at the time of use, and specifically, it is located in front of the longitudinal center part of the absorbent body 2 in the front. Part. In addition, the "rear part B" means the part located in the back side of a wearer at the time of use, and is specifically, the part located behind the longitudinal center part of the absorptive main body 2. "At least the rear part B" means including the form in which a part of the rear flap 3 is directing from the rear part A. As shown in FIG.

In addition, unless otherwise indicated, a "length direction" is a direction along the longitudinal direction of an absorbent article (absorbent main body 2), and a "width direction" means the width direction of an absorbent article (absorbent main body 2). Direction. In addition, "upper surface" and "lower surface" mean the upper surface and lower surface in an unfolded state, respectively.

As shown in FIG. 2, the absorbent body 2 includes the main body absorbing layers 21 and 23 and the main body leakage preventing layer 22. The body absorbing layers 21 and 23 are composed of a liquid permeable body surface sheet 21 and a liquid retaining body absorbent body 23. The main body absorbent body 23 has a substantially rectangular shape in plan view. The main body absorber 23 is formed of a laminate of an upper body absorber 23a and a lower body absorber 23b. The main body surface sheet 21 covers the entire upper surface of the main body absorbent body 23.

The body leakage preventing layer 22 is made of a liquid-impermeable or water-repellent body backsheet. The main body backsheet 22 covers the entire lower surface of the main body absorbent body 23.

On the upper surface of the absorbent body 2, as shown in FIG. 1, a crimping hole D is formed which is concave toward the main body absorber 23 from the main body surface sheet 21. As shown in FIG. The crimping hole D is formed by, for example, heat embossing, and integrates the body surface sheet 21 and the body absorber 23 into one body.

Thus, the absorbent body 2 consists of a laminated body laminated | stacked in order of the main body surface sheet 21, the main body absorber 23, and the main body back surface sheet 22. As shown in FIG.

As shown in Fig. 1, the rear flap 3 is not folded in a state produced by the absorbent body 2, and is used by being attached to underwear such as panties. However, the rear flap 3 may be folded to the upper surface side or the lower surface side of the absorbent body 2 in order to make the sanitary napkin compact and the like.

The length of the sanitary napkin 1 having the rear flap 3 is 26 cm or more, preferably 30 cm or more. The (one side) width (width along the width direction of the physiological napkin) of the rear flap 3 is 1 cm or more, Preferably it is 3 cm or more. It is preferable that the width of the back flap 3 is shorter than the width | variety of the absorbent main body 2 from a viewpoint of the convenience of handling at the time of taking out a sanitary napkin in an opening form, and the convenience of mounting a sanitary napkin. The rear flap 3 in this embodiment is arrange | positioned at the rear part B, and has a form which becomes wide from the front part A toward the rear part B. As shown in FIG.

As shown in FIG. 2, the rear flap 3 is provided with the flap absorption layers 31 and 33 and the flap sampling barrier layer 32. As shown in FIG. The flap absorbing layers 31 and 33 are composed of a liquid permeable flap surface sheet 31 and a liquid retaining flap absorber 33. The flap absorber 33 has a form in which the rear flap 3 is made smaller in plan view. The flap surface sheet 31 covers the entire upper surface of the flap absorber 33.

The flap leak prevention layer 32 consists of a liquid impermeable or water repellent flap back sheet. The flap back sheet 32 covers the entire lower surface of the flap absorber 33.

Thus, the back flap 3 consists of a laminated body laminated | stacked in order of the flap surface sheet 31, the flap absorber 33, and the flap back sheet 32. As shown in FIG.

The wing part 4 is used by being folded on the outer surface side of the crotch part of the undergarment, and has the same configuration as the rear flap 3 except for the different position, planar shape, and the like. As shown in FIG. 1, the wing | blade part 4 in this embodiment has a substantially trapezoid shape in which the bottom surface (side longer than an upper surface) is located in the side part side of the absorbent body 2.

Specifically, as shown in FIG. 3, the wing section 4 is a liquid permeable wing surface sheet 41, a liquid-conserving wing absorber 43, and a liquid impermeable or water-repellent wing back sheet 42. It consists of a laminated body laminated | stacked. The wing | blade absorber 43 is planar, and has the form which made the wing part 4 smaller. The wing surface sheet 41 covers the entire upper surface of the wing absorber 43. The blade back sheet 42 covers the entire lower surface of the wing absorber 43.

Thus, the wing part 4 consists of a laminated body laminated | stacked in order of the wing surface sheet 41, the wing absorber 43, and the wing surface sheet 42. As shown in FIG.

Although each said member which comprises the absorbent main body 2, the back flap 3, and the wing part 4 may be comprised separately, you may comprise a some member integrally.

In the present embodiment, as shown in Figs. 2 and 3, the main body surface sheet 21, the pair of flap surface sheets 31 and 31, and the pair of wing surface sheets 41 and 41 are one integral surface sheet. It is formed by (11). In addition, the main body backsheet 22, the pair of flap backsheets 32 and 32, and the pair of wing backsheets 42 and 42 are formed of one unitary backsheet 12.

Further, the lower body absorber 23b, the pair of flap absorbers 33 and 33, and the pair of wing absorbers 43 and 43 are formed of one unit absorber 13 and are integrated (direct integration).

In addition, the integral absorber 13 may be formed by partially overlapping the lower body absorber 23b, the flap absorber 33, and the wing absorber 43, respectively, with each other (indirect integration).

In other respects, the flap absorber 33 and the wing absorber 43 extend over the absorbent body 2 and are integrated directly or indirectly with a part of the main body absorber 23 (lower layer body absorber 23b). .

The reason why the flap absorber 33 extends over the absorbent body 2 and is integrated with a part of the main body absorber 23 is as follows. In the flap absorber 33, the body fluid is often absorbed indirectly or directly through the body absorber 23 in the region near the absorbent body 2 in the flap absorber 33. Even in such a case, the body fluid absorbed by the presence of the main body absorber 23 integrated with the flap absorber 33 in the region near the absorbent body 2 in the flap absorber 33 is absorbed at the absorption point (absorption center). It is difficult to leak from the periphery of the rear flap because it can diffuse gradually into a concentric circle.

In addition, when the flap absorber 33 and the main body absorber 23 are not integrated and are independent (separated), the flap absorber 33 is less likely to be affected by the diffusion of the liquid by the absorbent body 2. .

In addition, the upper body absorber 23a and the integral absorber 13 are separate.

The integrated surface sheet 11 covers the entire upper surface of the upper body absorber 23a and the aggregates 23a and 13 of the integrated absorber 13. The peripheral edge of the integrated surface sheet 11 is directed at the peripheral edges of the aggregates 23a and 13.

In addition, the integral backsheet 12 covers the entire lower surface of the integral absorber 13. The periphery of the integrated backsheet 12 is directed at the periphery of the integrated absorbent body 13.

The peripheral edge of the sheet 12 is integrally bonded to the peripheral edge of the integrated surface sheet 11 produced at the peripheral edges of the aggregates 23a and 13 by heat sealing, a hot-melt adhesive, or the like. have. In other respects, the flap surface sheet 31 and the flap back sheet 32 are joined at the outer periphery of the flap absorber 33. Similarly, the wing surface sheet 41 and the wing surface sheet 42 are joined at the outer periphery of the wing absorber 43.

In the flap back sheet (flap leak prevention layer) 32, as shown in FIG. 4, the concave-shaped structure which dug toward the flap back sheet 32 from the flap absorption layer (flap surface sheet 31, flap absorber 33) is Formed.

In this concave structure, in this embodiment, as shown to FIG. 4 and FIG. 5, the flap back surface sheet 32 has the dot-shaped flap concave part 5 which dug toward the outer surface from the inner surface in the lattice arrangement. It is formed by providing. In addition, the surface other than the flap recessed part 5 in the inner surface of the sheet 32 is called "base surface 32a."

The planar area of the dot-shaped flap concave portion 5 is preferably 0.1 to 10 mm 2, and more preferably 0.5 to 5 mm 2. The density (number per unit area) of the point-shaped flap recess 5 is preferably 4 to 20 pieces / cm 2, and more preferably 5 to 15 pieces / cm 2. Although the planar shape of the point-shaped flap concave part 5 is circular in this embodiment, it may be elliptical, rectangular, or indefinite form which does not have a specific form, for example.

If the flap recessed part 5 of a point shape is provided in the whole surface in the sheet | seat 32, if it is a flap, it may be provided partially.

As in the present embodiment, when the concave structure is formed by providing the flap concave portion 5 on the flap back sheet (flap leak prevention layer) 32, the depth of the flap concave portion 5 is a concave structure. Depth. The depth of the concave structure of the sheet 32 is preferably 0.05 to 5 mm. In detail, when the planar shape of the flap concave portion 5 is a regular shape such as a circle, an ellipse, a rectangle, or the like, the depth of the concave structure of the sheet 32 is that the concave structure is a liquid holding structure. From the viewpoint of being easy to function and facilitating the effect of suppressing the diffusion of the liquid by the surface tension of the retained liquid, the thickness is preferably 0.1 to 5 mm, more preferably 0.2 to 2 mm.

In addition, when the planar shape of the flap concave part 5 is an irregular shape, especially a fibrous pattern (that is, a linear concave part), the concave-shaped structure of the flap back sheet 32 will hold | maintain a liquid. Rather than functioning as a structure, the main effect of the diffusion suppression effect of the liquid is mainly 0.01 to 0.5 mm, more preferably 0.02 to 0.2 mm.

Due to the concave-shaped structure of the flap back sheet (flap leak prevention layer) 32, the flap absorber 33 and the flap back sheet 32 are discontinuously contacted in the plane direction. In the present embodiment, the flap absorber 33 and the flap back sheet 32 are in discontinuous contact with the base surface 32a of the flap back sheet 32.

As a result, the liquid absorbed by the flap absorber 33 mainly moves due to gravity and the structure of the flap absorber 33, and moves to the boundary area between the flap backsheet 32 and the flap absorber 33, It is easy to cause diffusion there. However, due to the concave structure of the sheet 32, the above-described flap suppression effect of the liquid is achieved.

In the rear flap 3, both the flap surface sheet 31 and the flap back sheet (flap leak prevention layer) 32 are joined to the flap absorber 33. As shown in FIG. For this bonding, for example, a hot melt adhesive is used. The coating shape of the adhesive is not particularly limited, and is, for example, a planar shape (so-called all over), a spiral shape, a stripe shape extending in the longitudinal direction or the width direction, an Ω shape, and a point shape.

In the present embodiment, the flap back sheet 32 and the flap absorber 33 can be discontinuously bonded by an adhesive (not shown) coated on the base surface 32a of the flap back sheet 32.

In the state where the flap back sheet 32 and the flap absorber 33 are laminated, embossing may be performed from the outer surface of the flap back sheet 32 toward the inner surface, and the two may be integrated by pressing or fusion. . In this integrated process, the part in which the embossing in the sheet | seat 32 which was not flap was performed is relatively in relation to the part in which the embossing was performed, As a result, the flap concave part 5 is formed. do. A part of the embossed portion constitutes the base surface 32a.

Also in the back surface sheet 22 of the main body of the absorptive main body 2, the main body recessed part (not shown) is provided similarly to the flap back surface sheet of the rear flap 3, and the concave-shaped structure is formed. Due to the concave structure of the main body back sheet 22, the main body absorber 23 and the main body back sheet 22 are discontinuously contacted in the planar direction.

The same structure may be used for the concave structure of the back surface sheet 22 of the absorbent body 2, and the concave structure of the back surface sheet 32 of the back flap 3, and the other structure may be employ | adopted. However, considering that it is preferable to use the above-described liquid diffusion inhibiting effect by the liquid holding function of the concave structure of the sheet 32, the following structure is preferably adopted. If the concave structure of the sheet 32 is irregular, when the flap sheet 32 is irregular, the irregular concave structure and the concave structure are irregular. Is used in combination so that the volume of the concave structure of the flap back sheet 32 is formed to be about 10 to 30% larger than the volume of the concave structure of the back cover body 22 of the absorbent body 2. desirable. In addition, when the concave structure of the flap back sheet 32 is shaped, the volume of the concave structure of the flap back sheet 32 is determined by appropriately setting the area, density, thickness, etc. of the concave structure. If it is the main body of 2), it is preferable to form about 10 to 30% larger than the volume of the concave-shaped structure of the sheet | seat 22.

Further, in order to further enhance the effect of suppressing the diffusion of the liquid due to discontinuous contact, a separation region without providing a concave structure may be formed between the absorbent body 2 and the rear flap 3. The separation region is preferably provided in a band shape extending in the longitudinal direction.

In the absorbent body 2, the main body backsheet 22 is bonded to the main body absorbent body 23. For this bonding, for example, a hot melt adhesive is used. The coating shape of the adhesive is not particularly limited, and is, for example, a planar shape (so-called all over), a spiral shape, a stripe shape extending in the longitudinal direction or the width direction,?, And a point shape. In the present embodiment, the main body backsheet 22 and the main body absorber 23 are coated on the base surface of the main body backsheet 22 (surfaces other than the main body recessed portion in the inner surface of the main body backsheet 22). It is joined discontinuously by an adhesive agent.

Also in the wing bottom sheet 42 of the wing part 4, the wing recess part (not shown) is provided similarly to the flap back seat sheet 32 in the rear flap 3, and a concave-shaped structure is formed, have.

The above description of the concave-shaped structure of the flap back sheet 32 in the rear flap 3 is the main body back sheet 22 of the absorbent body 2 and the wing back sheet 42 of the wing 4. This applies appropriately to the concave-shaped structure.

On the lower surface of the absorbent body 2, the rear flap 3, and the wing 4, that is, at a predetermined position of the lower surface of the integrated back surface sheet 12, as the shifting fixing material, the body adhesion part, the flap adhesion part, and the wing, respectively. An adhesion part (all not shown) is provided.

The upper body absorber 23a can be used without particular limitation as the absorber in the absorbent article. Upper body absorber (23a) is bulky, it is preferable that the high liquid retention capacity.

It is preferable that the lower body absorber 23b, the flap absorber 33, and the wing absorber 43, that is, the integral absorber 13 is formed in a sheet shape, and in particular, formed of a sheet-like material having low liquid diffusion property. It is preferable that it is done. Specific examples of the sheet-like material include dry pulp sheets (trade name "JS-50HB" Havix Co., Ltd. product, etc.), which are pulp-filled and fixed with a binder, and embossed in a wet absorbent paper. The processed embossed absorbent paper, etc. are mentioned, Among these, an embossed absorbent paper is especially preferable at the point of cost.

The flap absorber 33 and the wing absorber 43 are supplementary to absorb the body fluid overflowed from the main body absorber 23, and preferably have a low diffusivity during liquid absorption. Specifically, after dropping 1 g of physiological saline above about 1 cm of the absorber, the absorption area after 1 minute is preferably 80 cm 2 or less, and more preferably 50 cm 2 or less. By setting the absorption area to 80 cm 2 or less, diffusion of the liquid can be delayed, and body fluid can be prevented from excessively spreading and leaking the flap absorber 33 and the wing absorber 43.

The embossed absorbent paper is embossed to form a thickness on the absorbent paper and to prevent the liquid from diffusing in one direction. Although the embossing pattern is not specifically limited, The pattern which is embossed by the point shape at the density of 1-30 pieces / cm <2> is preferable.

The flap absorber 33 (integral absorber 13) preferably has a lower density on the non-skin contact side (particularly when the density is lower than that of the main body absorber 23), and is 0.05 to 0.2. It is more preferable that it is as low as g / cm 3. In addition, a "skin contact surface side" is a side arrange | positioned at the skin side of a wearer at the time of wearing, and a "skin non-contact surface side" is the opposite side to a skin contact surface side.

These densities are measured as follows using an electron microscope. First, the thickness of the flap absorber 33 is measured without removing the rear flap 3. Thereafter, the flap absorber 33 is separated from the other constituent members of the rear flap 3, the mass and the area are measured, and the density is calculated from the mass, the area and the thickness. At this time, if the area of the separated flap absorber 33 is less than 200 cm 2, the density of the sample is set to 200 cm 2 or more by removing the flap absorber 33 of another sample and replenishing the sample. Measure it. It is preferable to measure a density using a some sample. In addition, the thickness of the flap absorber 33 is measured including fluff.

As a method of making the density of the skin non-contacting surface side lower than the density of the skin-contacting surface side, for example, heat embossing is performed from the skin non-contacting surface side of the flap absorber 33 toward the skin-contacting surface side, and then subjected to hot air. The method of restoring the volume of the flap absorber 33 can be mentioned.

In the flap absorber 33, when the density of the skin non-contacting surface side is lower than the density of the skin-contacting surface side, the effect of suppressing the diffusion of the liquid in the rear flap 3 is increased and the leakage preventing effect can be improved. Preferred at

The density of the flap absorber 33 is preferably 0.01 g / dl, more preferably 0.03 g / dl.

The density of the flap absorber 33 is preferably higher than the density of the main body absorber (the lower body absorber 23b in this embodiment) extending therefrom, and more preferably about 0.05 to 0.2 g / cm 3. .

As a method of making the density of the flap absorber 33 higher than the density of the main body absorber integrated therewith, for example, a method of applying heat and pressure between the rolls only to the rear flap, or the flap surface sheet 31 ) And the flap absorber 33 are bonded by thermal embossing or the like.

If the density of the flap absorber 33 is higher than the density of the main body absorber integrated with this, the body fluid absorbed by the flap absorber 33 is difficult to flow back into the main body absorber integrated with this.

The buckling strength of the flap absorber 33 is preferably 20 to 500 g, more preferably 50 to 300 g from the viewpoint of torsional prevention and improvement of the feeling of wearing. By setting the buckling strength to 20 g or more, the rear flap 3 becomes difficult to twist. On the other hand, by setting the buckling strength to 500 g or less, the whole of the rear flap 3 can be prevented from becoming too hard, and it can be prevented from feeling uncomfortable at the time of mounting.

The buckling strength is measured as follows.

[Measuring Method of Buckling Strength]

The measurement is performed under these temperature and humidity conditions using an absorber left at least 1 day at 20 ° C. and 65% RH.

In detail, an absorber is cut out to 150 mm long x 30 mm wide, and this is used as a sample. The longitudinal ends of the sample are overlapped with each other so that the width of the overlapping portion is 5 mm to form an annular shape. Thereafter, the top and bottom portions of each of 1 cm are fixed by a stapler so that the length direction of the needle becomes a direction perpendicular to the compression direction, and a ring-shaped sample is obtained. The obtained ring-shaped sample is placed on a sample stage of a tensilon tester (trade name "RTC-1210A", manufactured by Orientec Co., Ltd.) with the longitudinal direction of the sample as the lower surface. After installation, the sample is compressed at a measurement rate of 10 mm / min in the compression test mode and the maximum strength when buckling is obtained. The five samples created separately are measured similarly, the average is calculated, and the buckling strength is obtained.

In order to obtain the desired rigidity and diffusivity, the thickness of the flap absorber 33 is preferably 0.2 to 5 mm, more preferably 0.2 to 3 mm, and preferably 0.3 to 2 mm under a 2.5 g / m 2 load. It is more preferable.

The above description regarding the various physical properties of the flap absorber 33 is also appropriately applied to the various physical properties of the wing absorber 43.

The sanitary napkin 1 of this embodiment is attached to underwear, such as panties, without folding back in the state which produced the back flap 3 from the absorbent body 2, and attaches the wing part 4 to the crochet part of the underwear. It is used by folding back to the side.

In detail, the sanitary napkin 1 of this embodiment arrange | positions the absorbent body 2 to the inner surface of the crotch part of a panty, arrange | positions the rear flap 3 to the inner surface of a panty, and has the wing part 4 To the outer surface side of the crotch portion, and the absorbent body 2, the rear flap 3 and the wing portion 4 are fixed to the inner or outer surface of the panties by the body adhesive portion, the flap adhesive portion and the wing adhesive portion, respectively. By doing so, it can attach while preventing a position shift.

In the sanitary napkin 1 of the present embodiment, the liquid oozed from the rear portion B of the absorbent body 2 and the liquid flowing without being absorbed can be effectively absorbed by the rear flap 3. Therefore, it is excellent in the liquid leakage prevention property from the rear part B.

In the back flap 3, for example, if the flap recess 5 is not provided in the flap back sheet 32, and the concave structure is not formed, the flap absorber 33 and the flap back sheet 32 Only an extremely small space is formed at the interface with). Therefore, a large capillary force acts on the space of the interface, and the body fluid absorbed by the flap absorber 33 is excessively diffused and easily leaks from the periphery of the rear flap 3.

On the other hand, in the rear flap 3 in this embodiment, since the flap recess 5 is provided in the sheet | seat 32 when the flap is back, and the concave-shaped structure is formed, the flap absorber 33 and the flap A space of sufficient size is formed at the interface with the back sheet 32. Specifically, a space mainly composed of the flap recesses 5 is formed. Therefore, even if the body fluid absorbed by the flap absorber 33 moves to the interface between the flap absorber 33 and the flap back sheet 32, the presence of a space of sufficient size makes it difficult to generate a capillary force, The concave structure (flap recess 5) becomes a resistance, and excessive diffusion is suppressed. As a result, the body fluid absorbed by the flap absorber 33 is less likely to leak from the periphery of the rear flap 3. The effect of suppressing the diffusion of the liquid by the concave structure is based on the function as the holding structure of the liquid of the concave structure and the surface tension of the retained liquid, as described above.

Similarly, since the liquid drawn out from the front portion A of the absorbent body 2 and the liquid flowing without being absorbed can be effectively absorbed by the wing portion 4, the liquid leakage prevention property from the front portion A is prevented. outstanding.

In the first embodiment, the concave-shaped structure of the flap back sheet (flap leak prevention layer) 32 is, for example, as shown in FIG. 6, on the inner surface of the flap back sheet 32. The flap concave part 5 of i) can be formed by arranging and arranging in parallel at predetermined intervals. The recessed flap recess 5 preferably extends along the longitudinal direction of the sanitary napkin 1.

In addition, the main body absorbent body 23 can be made into the one-layer structure only the lower main body absorber 23b, without removing the upper body absorber 23a.

Next, another embodiment of the absorbent article of the present invention will be described. About another embodiment, a different point from 1st embodiment mentioned above is mainly demonstrated, the same point is attached | subjected with the same code | symbol, and description is abbreviate | omitted. The description about 1st Embodiment applies suitably unless otherwise demonstrated.

In the sanitary napkin of the second embodiment, as shown in Fig. 7, the lower body absorbent body 23b does not cover the entire width direction of the absorbent body 2, as compared with the first embodiment, and the absorbent body 2 The main difference is that they are separated and installed only in the vicinity of the two sides.

According to the sanitary napkin 1 of 2nd Embodiment comprised in this way, the same effect as the 1st Embodiment is achieved, and it is difficult to backflow liquid to the main body absorber 23, and the fit of the back part B is The effect of higher) property is also achieved.

In the sanitary napkin 1 of 3rd Embodiment, as shown in FIG. 8, compared with 2nd Embodiment, the flap absorber 33 does not extend over the absorbent body 2, The main body absorber 23 The main difference is that it is not integrated with. The main body absorber 23 may have a single layer structure or a plurality of structures.

According to the sanitary napkin 1 of 3rd Embodiment comprised in this way, the effect similar to 2nd Embodiment is achieved, and the fitting property of the back flap 3, the flap absorber 33, and the main body absorber 23 are not shown. Effects of reducing the water repellency and the absorption capacity of the main body absorbent body 23 due to the step reduction are also achieved.

EMBODIMENT OF THE INVENTION Hereinafter, the absorbent article of this invention is demonstrated, referring drawings for based on the 4th Embodiment.

The absorbent article of the fourth embodiment is a sanitary napkin 1 similarly to the first embodiment, and as shown in FIGS. 1 to 3, the main body surface sheet 21, the main body backsheet 22, and the space between them. A pair of substantially longitudinally absorptive main bodies 2 having a main body absorbent body 23 interposed therebetween, and a pair extending in the width direction outward from each of at least two side portions of at least the rear part B in the absorptive main body 2. It has a rear flap (3, 3) and a pair of wing parts (4, 4) extending in the width direction outward from each of both side portions of the front portion (A) in the absorbent body (2).

As shown in FIG. 2, the absorbent body 2 includes a liquid-permeable main body surface sheet 21, a liquid impermeable or water-repellent main body backsheet 22, and a liquid-retaining main body absorbent body 23. The main body absorbent body 23 has a substantially rectangular shape in plan view. The main body absorber 23 is formed of a laminate of an upper body absorber 23a and a lower body absorber 23b. The main body surface sheet 21 covers the entire upper surface of the main body absorbent body 23. The main body backsheet 22 covers the entire lower surface of the main body absorbent body 23.

On the upper surface of the absorbent body 2, as shown in FIG. 1, the crimp groove | channel D recessed from the main body surface sheet 21 toward the main body absorber 23 is provided. The crimp groove D is formed by, for example, heat embossing, and integrates the main body surface sheet 21 and the main body absorber 23 into one body.

Thus, the absorbent body 2 consists of a laminated body laminated | stacked in order of the main body surface sheet 21, the main body absorber 23, and the main body back surface sheet 22. As shown in FIG.

As shown in FIG. 2, the back flap 3 consists of a liquid permeable flap surface sheet 31, a liquid impermeable or water repellent flap sheet 32, and a liquid-retaining flap absorber 33. As shown in FIG. The flap absorber 33 has a shape in which the rear flap 3 is reduced by one step in plan view. The flap surface sheet 31 covers the entire upper surface of the flap absorber 33. The flap back sheet 32 covers the entire lower surface of the flap absorber 33.

Thus, the back flap 3 consists of a laminated body laminated | stacked in order of the flap surface sheet 31, the flap absorber 33, and the flap back sheet 32. As shown in FIG.

9 and 10, the flap absorber 33 and the flap back sheet 32 are joined by a bonding material 6 (hereinafter also referred to as a "flap bonding material") arranged intermittently in the plane direction. In the present embodiment, the flap bonding material 6 is provided in a lattice arrangement on the inner surface 32f of the flap back sheet 32, and the flap absorber 33 and the flap are formed by the flap bonding material 6. The back sheet 32 is joined discontinuously.

Here, as shown in 9, when the flap bonding material 6 and the flap back sheet 32 are integrally seen, the upper surface of the flap bonding material 6 is a base surface, and the inner surface 32f of the flap back sheet 32 is concave. The concave structure serving as the bottom of the negative portion is formed.

The planar viewing area of the point-shaped flap bonding material 6 is preferably 0.1 to 10 mm 2, and more preferably 0.5 to 5 mm 2. The density (number per unit area) of the point-shaped flap bonding material 6 is preferably 4 to 20 pieces / cm 2, and more preferably 5 to 15 pieces / cm 2. Although the planar view shape of the point-shaped flap joint material 6 is circular in this embodiment, it may be elliptical and square, for example.

Although the point-shaped flap bonding material 6 is preferably provided entirely on the inner surface 32f of the sheet 32 when the flap bonding material 6 is a flap, it may be partially provided.

In the back flap 3, the depth of the said concave-shaped structure, ie, the thickness of the flap bonding material 6, becomes like this. Preferably it is 0.1-5 mm, More preferably, it is 0.2-2 mm.

The constituent fibers of the flap absorber 33 protrude from the flap back sheet 32 between the flap bonding materials 6 intermittently arranged.

As described above, the flap absorber 33 and the flap back sheet 32 may be formed by the flap bonding material 6 as a method of forming the protruding structure by forming the sheet 32 if the constituent fibers of the flap absorber 33 are flaps. After discontinuously bonding, the method of performing hot air processing with respect to the flap absorber 33 is mentioned.

In this way, if the constituent fibers of the flap absorber 33 are projected toward the sheet 32 when the flap is interposed between the flap bonding materials 6 intermittently arranged, the rear flap 3 has a liquid of a magnetite. The holding space is shaped, and since the holding space becomes less dense than its surroundings, diffusion of liquid is unlikely to occur.

In the rear flap 3, the flap surface sheet 31 is joined to the flap absorber 33. As shown in FIG. For this bonding, for example, a hot melt adhesive is used. The coating shape of the adhesive is not particularly limited, and is, for example, a planar shape (so-called spreading all over), a spiral shape, a stripe shape extending in the longitudinal direction or the width direction,?, And a point shape.

Also in the absorbent body 2, like the rear flap 3, the main body absorbent body 23 and the main body backsheet 22 are joined by a main body bonding material (not shown) intermittently arranged in the plane direction so that a concave-shaped structure is formed. It is preferable that it is formed.

For example, on the inner surface of the sheet 22, a dot-shaped main body bonding material is provided in a lattice arrangement, and a concave structure is formed. The planar viewing area of the viscous body-bonded material is preferably 0.1 to 10 mm 2, more preferably 0.5 to 5 mm 2. The density (number per unit area) of the pointed flop bonding material 6 is preferably 4-20 pieces / cm 2, and more preferably 5-15 pieces / cm 2. The planar view shape of the point-shaped main body bonding material is, for example, circular, elliptical, and square.

The thickness of the body bonding material is preferably 0.1 to 5 mm, more preferably 0.2 to 2 mm.

The same structure may be used for the concave structure of the back surface sheet 22 of the absorbent body 2, and the concave structure of the back surface sheet 32 of the back flap 3, and the other structure may be employ | adopted. However, considering that it is preferable to use the effect of suppressing the diffusion of the liquid by the liquid retention function of the concave-shaped structure of the sheet 32, the following structure is preferably adopted. In the case where the flap backsheet 32 is of irregular shape, the state in which the regular concave structure is formed by processing by the regular structure alone, or the irregular concave structure and the regular concave structure are used in combination. It is preferable to form the volume of the concave structure of the sheet 32 when the flap is in the closed state by about 10 to 30% larger than the volume of the concave structure of the body 22 of the absorbent body 2. In addition, when the concave structure of the flap back sheet 32 is shaped, the volume of the concave structure of the flap back sheet 32 is determined by appropriately setting the area, density, and thickness of the concave structure. If it is a main body, it is preferable to form about 10 to 30% larger than the volume of the concave-shaped structure of the sheet | seat 22.

Also in the wing part 4, like the rear flap 3, the wing absorber 43 and the blade back seat 42 are joined by the wing bonding material (not shown) intermittently arrange | positioned in a plane direction, and is concave-shaped. It is preferable that a structure is formed.

The above description about the flap bonding material 6 in the rear flap 3 is suitably applied to the said body bonding material in the absorptive main body 2, and the said wing bonding material in the blade | wing part 4.

The main body adhesive part, the flap adhesive part, and the wing adhesive part (all of them) are shifting fixing materials at predetermined positions of the lower surface of the absorber body 2, the rear flap 3, and the wing part 4, that is, the lower surface of the back surface sheet 12, respectively. Not shown) is installed.

In the sanitary napkin 1 of the present embodiment, since the liquid drawn out from the rear portion B of the absorbent body 2 can absorb the liquid flowing without being absorbed by the rear flap 3 effectively, Excellent for preventing liquid leakage at the rear part (B).

If the flap bonding material 6 is not provided in the rear flap 3, only a very small space is formed in the interface between the flap absorber 33 and the flap sheet 32. As shown in FIG. Therefore, a large capillary force acts on the space of the interface, and the body fluid absorbed by the flap absorber 33 is excessively diffused and easily leaks from the peripheral edge of the rear flap 3.

On the other hand, in the rear flap 3 in this embodiment, the flap absorber 33 and the flap back seat sheet 32 are joined by the flap bonding material 6 arrange | positioned intermittently in the plane direction. Therefore, the interface between the flap absorber 33 and the flap back sheet 32 is spaced apart by the thickness of the flap bonding material 6, and the interface has a space of sufficient size. Therefore, even when the body fluid absorbed by the flap absorber 33 moves to the interface between the flap absorber 33 and the flap back sheet 32, the presence of a space of sufficient size makes it difficult to produce a capillary force and concave-shaped structure. (Flap bonding material 6) becomes resistance, and excessive diffusion is suppressed. As a result, the body fluid absorbed by the flap absorber 33 is less likely to leak from the periphery of the rear flap 3.

Similarly, since the liquid portion oozed from the front portion A of the absorbent body 2 and the liquid flowing without being absorbed can be effectively absorbed by the wing portion 4, the liquid leakage prevention property at the front portion A is prevented. outstanding.

In the fourth embodiment, for example, as shown in Fig. 11 (a), a plurality of strip-shaped flap bonding materials 6 are arranged in parallel on the inner surface 32f of the flap back sheet 32 at predetermined intervals. Can be installed. It is preferable that the strip | belt-shaped flap bonding material 6 extends along the longitudinal direction of the sanitary napkin 1.

As shown in Fig. 11 (b), the plurality of spiral flap joining materials 6 can be arranged in equilibrium at predetermined intervals on the inner surface 33f of the flap back sheet 32. It is preferable that the spiral flap bonding material 6 be continuous along the longitudinal direction of the sanitary napkin 1.

In addition, the main body absorbent body 23 can be made into the one-layer structure only of the lower main body absorber 23b, without removing the upper body absorber 23a.

EMBODIMENT OF THE INVENTION Hereinafter, the absorbent article of this invention is demonstrated, referring drawings for based on the 5th Embodiment.

The absorbent article of the fifth embodiment is a sanitary napkin 101, and as shown in Figs. 12 to 14, the substantially vertical absorbent component 102 including the main body absorbing layers 121 and 123 and the main body leaving layer 122 is provided. ) And a pair of rear flaps 103 and 103 extending outward in the width direction from at least both sides of the rear portion B of the absorbent body 102 and the front portion A of the absorbent body 102. It has a pair of wing parts 104 and 104 which extend outward in a width direction from each side.

The rear flap 103 includes a flap surface sheet 131, a flap back sheet 132, and a flap absorber 133 interposed therebetween. As shown in FIG. 15, the flap back sheet 132 includes an upper layer sheet 132a having a plurality of raised portions 132c protruding toward the flap absorber 133 and a lower layer sheet 132b having air permeability. It has a two-layer structure.

As shown in FIGS. 13 and 14, the absorbent body 102 includes the main body absorbing layers 121 and 123 and the main body leaving layer 122. The body absorbing layers 121 and 123 include a liquid permeable body surface sheet 121 and a liquid retaining body absorbent body 123. The body leakage preventing layer 122 is made of a liquid-impermeable or water-repellent body backsheet. The main body surface sheet 121 covers the entire upper surface of the main body absorbent body 123. The main body backsheet 122 covers the entire lower surface of the main body absorbent body 123.

Thus, the absorber main body 102 consists of the laminated body laminated | stacked in order of the main body surface sheet 121, the main body absorber 123, and the main body back sheet 122. As shown in FIG.

The main body absorber 123 is formed of a laminate of an upper body absorber 123a and a lower body absorber 123b. The upper body absorber 123a is shorter in length and width than the lower body absorber 123b in plan view. The upper body absorber 123a is not joined to the lower body absorber 123b. The upper main body absorber 123a is located near the center in the longitudinal direction and the width direction in the lower main body absorber 123b, and is further located near the center in the longitudinal direction and the width direction in the absorber main body 102. In other words, the upper main body absorber 123a forms a middle area that is narrower than the lower main body absorber 123b at a portion of the absorber body 102 that contacts the excretion unit.

In this way, since the used area is formed in the vicinity of the excretory portion, and a groove is formed around the excretion portion, in the sanitary napkin of the present embodiment, the curve in the front and rear direction of the lower part of the crotch of the wearer when the sanitary napkin 101 is attached. It becomes easy to fit in a shape, and the leakage prevention effect by the back flap 103 improves.

As shown in FIG. 12, a central groove D1 formed by integrally consolidating the main body surface sheet 121 and the lower body absorber 123b is provided around the upper body absorber 123a. The central groove D1 has a step structure consisting of a portion deeply dug by high compression and a portion dug deeply by low compression. Since the central groove D1 is provided so as to surround the upper body absorber 123a, the respective effects of the shape collapse prevention, torsion prevention and liquid diffusion prevention of the upper body absorber 123a are exhibited.

In addition, the center groove (D1) is preferably provided over the entire outer circumference of the upper body absorber (123a), but is installed so as to partially surround the upper body absorber (123a), for example, only in the width direction both sides You may be.

In the front portion (A) and the rear portion (B) of the absorbent body (102), the front surface (D2) and the rear groove (D3) formed by integrally consolidating the main body surface sheet (121) and the lower body absorber (123b). ) Is installed. The front grooves D2 and the rear grooves D3 have a substantially semi-circular arc shape, and are continuously provided with the central grooves D1 on the front side and the rear side, respectively, than the whole and the rear portions of the central grooves D1.

As shown in FIG. 13, the back flap 103 is provided with the flap absorption layers 131 and 131, and the flap leak prevention layer 132. As shown in FIG. The flap absorbing layers 131 and 133 are formed of a liquid permeable flap surface sheet 131 and a liquid-retaining flap absorber 133. The flap absorber 133 has a shape in which the rear flap 103 is further reduced in plan view. The flap surface sheet 131 covers the entire upper surface of the flap absorber 133.

The flap leak prevention layer 132 consists of a flap back sheet. The flap surface sheet 132 covers the entire lower surface of the flap absorber 133.

Thus, the back flap 103 consists of a laminated body laminated | stacked in order of the flap surface sheet 131, the flap absorber 133, and the flap back sheet 132. As shown in FIG.

Further, the lower body absorber 123b, the pair of flap absorbers 133 and 133, and the pair of wing absorbers 143 and 143 are formed of one integral absorber 113 and integrated (direct integration). The upper body absorber 123a and the integral absorber 113 are separate.

In addition, the integral absorber 113 can be formed by partially joining the lower body absorber 123b, the flap absorber 133, and the wing absorber 143, respectively, (indirect integration).

The integral surface sheet 111 covers the entire upper surface of the aggregates 123 and 113 of the main body absorber 123 and the integral absorber 113. The peripheral part of the integrated surface sheet 111 is directed from the peripheral parts of the aggregates 123 and 113.

In addition, the integral backing sheet 112 covers the whole lower surface of the integral absorber 113. The periphery of the integrated backsheet 112 is directed from the periphery of the integrated absorbent body 113. And it directs from the periphery of aggregate 123,113. If the peripheral part of the integral surface sheet 111 and the integral part of the sheet 112 are joined together by a heat seal, a hot melt adhesive, or the like. In another view, the flap surface sheet 131 and the flap back sheet 132 are joined at the outer periphery of the flap absorber 133. Similarly, the wing surface sheet 141 and the wing surface sheet 142 are joined at the outer periphery of the wing absorber 143.

In the boundary between the absorbent body 102 and the rear flap 103, as shown in Figs. 12 and 13, a pair of compressed sheet wires 105 and 105 for compression-bonding the integral surface sheet 111 and the integral absorber 113 are shown. It is provided to extend in the longitudinal direction. By providing the compressed solid line 105 in this manner, the compressed solid line 105 has a liquid induction effect of guiding a liquid to a part of the integrated absorbent body 113 (lower body absorber 123b) in the widthwise inner side thereof. It has a liquid diffusion prevention effect in the width direction outward of the compressed solid line 105, ie, the rear flap 103. Moreover, the plasticity is improved in the rear part B in which the compressed solid line 105 is provided, and a rear part is provided. In (B), the liquid leakage prevention effect is acquired.

Further, in the width direction outward of the compressed solid line 105, a part of the integral surface sheet 111 (flap surface sheet 131) and a part of the integral absorber 113 (flap absorber 133) are joined by an adhesive or the like. If not, the fit of the rear flap 103 is increased and at the same time, the effect of preventing liquid diffusion is improved.

In the rear flap 103, the flap leak prevention layer 132 is joined to the flap absorber 133. For this bonding, for example, a hot melt adhesive is used. The coating shape of the adhesive is not particularly limited, and is, for example, a planar shape (so-called spreading all over), a spiral shape, a spiral shape extending in the longitudinal direction or the width direction,?, And a point shape.

In the absorbent body 102, the sheet 122 is bonded to the main body absorbent body 123. For this bonding, for example, a hot melt adhesive is used. The coating shape of the adhesive is not particularly limited, and is, for example, a planar shape (so-called spreading all over), a spiral shape, a spiral shape extending in the longitudinal direction or the width direction,?, And a point shape. In this embodiment, the main body backsheet 122 and the main body absorber 123 are discontinuously bonded by the adhesive agent coated on the main body backsheet 122.

On the lower surface of the absorbent body 102, the rear flap 103 and the wing 104, i.e., at a predetermined position of the lower surface of the lower surface of the seat 112, the main body adhesive part, the flap adhesive part, and the wing adhesive part (all Not shown) is installed.

The back flap 103 of the present embodiment will be described in more detail. As shown in FIG. 15, the flap back sheet (flap leak prevention layer) 132 has a two-layer structure of the upper layer sheet 132a and the lower layer sheet 132b. Have.

The upper sheet 132a has a plurality of ridges 132c protruding toward the flap absorber 133. According to such an upper layer sheet 132a, as shown in FIG. 15, the area | region 132d in which the ridge part 132c in the upper layer sheet 132a is not provided by the ridge part 132c, and the flap absorber 133 are shown. ) Is separated. And the lower surface (skin non-contact surface) of the upper layer sheet 132a is coat | covered with the lower layer sheet 132b. As a result, a suitable space is formed between the flap absorber 133 and the lower layer sheet 132b.

In this embodiment, the piercing part 132c is provided with the opening part 132e in the upper end. That is, the raised portion 132c protruding toward the flap absorber 133 in the upper sheet 132a is a protruding opening. In the opening 132e, the upper layer sheet 132a and the flap absorber 133 are in contact with each other. The protrusion opening preferably has a shape (shape with a constant height) in which the entire upper end portion can contact the flap absorber 133. By having such formation, the space formed between the flap absorber 133 and the lower layer sheet 132b can be stably retained.

The thickness of the entire upper layer sheet 132a having the ridges 132c is preferably 0.1 to 1.0 mm, more preferably 0.3 to 0.7 mm, under a weight of 0.5 gf / cm 2. The thickness is measured by KES-G5 (manufactured by Kato Tech Co., Ltd.).

The plane direction distance between the adjacent ridges 132c becomes like this. Preferably it is 0.2-2 mm, More preferably, it is 0.5-1.5 mm.

There is no restriction | limiting in particular in the opening shape of the opening part 132e, For example, circular, elliptical, etc. are mentioned. The opening area of the opening part 132e stably forms a space between the flap absorber 133 and the lower layer sheet 132b, and between the flap absorber 133 and the upper layer sheet 132a and the lower layer sheet 132b. It is preferable that it is 0.01-0.5 mm <2>, and it is still more preferable that it is 0.05-0.3 mm <2> from a viewpoint that a large amount of liquid does not leak out.

Although the conventionally well-known material, such as a nonwoven fabric and a film material, can be used as the upper sheet 132a, It is preferable to form from the film material from the point which can form the raised part 132c stably.

As the lower layer sheet 132b, a sheet having air permeability is used. As such a sheet | seat, the film of a thermoplastic resin which has air permeability, SMS (spunbond-melt blown-spunbond) nonwoven fabric, etc. are mentioned.

The upper layer sheet 132a having the opening portion 132e at the upper end of the ridge portion 132c is, for example, a male frame having an protrusion corresponding to the shape of the opening portion 132e, having a predetermined arrangement pattern, and an elastic backup plate. It can manufacture by pressing a flat film under heating under heating.

In addition, the upper layer sheet 132a can be produced by sucking a thermoplastic film under heating on a roll or a conveyor provided with a suction net having a hole shape of an arrangement pattern corresponding to the shape of the opening 132e.

The above description regarding the various physical properties of the flap back sheet 132 is also appropriately applied to various physical properties of the flap back sheet 142.

Next, the flap surface sheet 131 in this embodiment is demonstrated. 15 and 16, the flap surface sheet 131 has a plurality of projecting openings 131a which project toward the flap absorber 133. As shown in FIG. Between the adjacent protruding openings 131a, they are curved in a convex shape toward the upper surface side so as to have a top portion 131b, and a flap convex portion 106 is formed. In addition, as shown in FIG. 16, the flap convex part 106 is provided with many micro apertures 131g with a smaller opening area than protrusion protrusion 131a. In addition, in FIG. 15 and FIG. 17, illustration of the micro hole 131g is abbreviate | omitted.

As shown in Fig. 17, the plurality of top portions 131b are alternately arranged so that the valley portions 131e and the interosseous portions 131f do not have a flat portion in a substantially straight line. That is, a plurality of minute openings 131g are formed in the valley portion 131e, and a plurality of protrusion openings 131a are formed in the valley section 131f.

The wavy structure formed by the valley part 131e and the interosseous part 131f is inclined and extended 0 to 30 degrees toward the longitudinal direction of the absorbent body 102. According to this flap surface sheet 131, as shown in FIG. 16, the flap convex part 106 and the flap absorber 133 in the flap surface sheet 131 are separated by the protrusion opening 131a, On the lower surface (skin non-contacting surface) of the flap surface sheet 131, a space in which liquid can be temporarily held between adjacent protruding openings 131a (hereinafter referred to as a "stock space") ( 134 is formed.

The protruding space 131a may have a shape (shape with a constant height) in which the entire lower end portion thereof can contact the flap absorber 133. In order to easily guide the liquid into the stock space 134, the protrusion opening 131a has a portion 131c contacting the flap absorber 133 and an open portion toward the stock space 134 as shown in FIG. It is preferable to have 131d). Since the projection opening 131a has a portion 131c in contact with the flap absorber 133, the liquid easily enters the stock space 134, and has an open portion 131d toward the stock space 134 to move the liquid. You can increase the dry feeling.

Of the total number of the protruding openings 131a, the protruding openings 131a which do not contact the flap absorber 133 at all are preferably present at least 50%, more preferably at least 70%, particularly preferably at least 90%. If it is, it has the same effect regardless of the presence or absence of the open portion (131d). In this embodiment, the open portion 131d may be provided.

The thickness of the entire flap surface sheet 131 having the protruding openings 131a is preferably 0.2 to 1.0 mm, more preferably 0.3 to 0.7 mm, under a weight of 0.5 gf / cm 2.

The plane distance between the adjacent protruding openings 131a is preferably 0.5 to 5 mm. It is preferable that the area of the area | region enclosed by the three adjacent protrusion opening 131a is 0.1-10 mm <2> in the point which is easy to hold | maintain a liquid in the stock space 134.

There is no restriction | limiting in particular in the opening formation of the protrusion opening 131a, For example, although the opening of an oval, a triangle, and a square is mentioned, circular or elliptical is the point which can improve the soft feeling of the flap surface sheet 131. desirable.

It is preferable that it is 0.1-10 mm <2>, and, as for the opening area of the protrusion opening 131a from the point of stability of the protrusion opening 131a and the improvement of permeability of a liquid, it is more preferable that it is 0.2-5 mm <2>. In addition, the porosity of the flap surface sheet 131 is preferably 3 to 30%, more preferably 5 to 15% in terms of improving liquid permeability. The opening ratio is determined by subtracting the opening area of the protruding opening 131a from the upper surface (outer surface) side to the lower surface (inner surface) side of the flap surface sheet 131 as the area of the flap surface sheet 131. .

The opening area of the micropores 131g is preferably 0.01 to 0.1 mm 2, more preferably 0.02 to 0.07 mm 2 in terms of improving the soft feeling of the flap surface sheet 131. The density (number per unit area) of the micropores 131g is preferably 20 to 200 pieces / cm 2, and more preferably 50 to 100 pieces / cm 2.

The distance between adjacent valley portions 131e (that is, the distance of the top portion 131b) is preferably 0.2 to 5 mm, more preferably 0.5 to 3 mm. Similarly, the distance between adjacent bone spaces 131f is also preferably 0.2 to 5 mm, more preferably 0.5 to 3 mm.

As the flap surface sheet 131, a conventionally known material such as a nonwoven fabric or a film material can be used. The flap surface sheet 131 is preferably formed of a film material because the stock space 134 tends to exist stably.

The flap surface sheet 131 having the protruding openings 131a and the small openings 131g can be produced, for example, by the method described in Japanese Patent Application Laid-Open No. 62-57975.

Next, the flap absorber 133 will be described. In the present embodiment, the flap absorber 133 is preferably formed in a relatively thin sheet shape in consideration of suitability to the curved shape of the wearer's body, followability to the wearer's body movement, and the like. In order to lower the irritation to the skin (to increase the dry feeling), it is desirable to have high liquid retention. Specific examples of the material of the flap absorber 133 include a dry pulp sheet (trade name "JS-50HB" Havix Co., Ltd. product, etc.) fixed with a pulp and fixed with a binder, and an embossed absorbent paper embossed with a wet absorbent paper. Can be. In this embodiment, the flap absorber 133 is comprised by the dry pulp sheet.

As the main body surface sheet 121, the wing surface sheet 141, and the main body back sheet 122, various materials conventionally used for this kind of absorbent article can be used without particular limitation. For example, as a surface sheet, the nonwoven fabric by various manufacturing methods, the thing which formed the perforation to the resin film, these laminated bodies, etc. can be used. As the back sheet, a film of a thermoplastic resin with or without moisture permeability, a water repellent nonwoven fabric, a laminate thereof, and the like can be used.

The upper body absorber 123a can be used without particular limitation, which has conventionally been used as an absorber in an absorbent article. Upper body absorber (123a) is preferably bulky, high liquid retention capacity.

In the sanitary napkin 101 of the present embodiment, the liquid that leaks out of the rear portion B of the absorbent body 102 and the liquid flowing without being absorbed can be effectively absorbed by the rear flap 103. Excellent in preventing liquid leakage at part (B).

Similarly, since the liquid from the front portion A of the absorbent body 102 or the liquid flowing without being absorbed can be effectively absorbed by the wing portion 104, the liquid leakage at the front portion A is excellent. .

In the rear flap 103 in the sanitary napkin 101 of this embodiment, the upper layer sheet 132a which has many ridges 132c between the flap absorber 133 and the lower layer sheet 132b is provided. Since it exists, the space of sufficient magnitude | size is formed in the interface of the flap absorber 133 and the lower layer sheet 132b. Therefore, even if the body fluid absorbed by the flap absorber 133 moves to the interface between the flap absorber 133 and the lower layer sheet 132b, the capillary force is hardly generated due to the presence of sufficient space, and the plurality of ridges 132c resist. Thus, excessive diffusion is suppressed. As a result, the body fluid absorbed by the flap absorber 133 is less likely to leak from the periphery of the rear flap 103.

Moreover, the upper layer sheet 132a has many opening parts 132e, the flap absorber 133 is contacted in the opening part 132e, and the lower layer sheet 132b is comprised from the sheet which has air permeability, This is excellent in breathability in the flap leakage preventing layer 132.

Furthermore, the flap surface sheet 131 has a plurality of protrusion openings 131a which project toward the flap absorber 133, and the protrusion openings 131a in the flap surface sheet 131 are formed by the protrusion openings 131a. The region 131b not provided and the flap absorber 133 are separated from each other. Therefore, the flap surface sheet 131 is formed with a stock space 134 serving as a temporary holding space of the liquid, thereby improving the liquid retention of the flap absorbing layers 131 and 133.

In addition, the flap surface sheet 131 has a small opening 131g having a smaller opening area than the protrusion opening 131a, and can further enhance the soft feeling of the flap surface sheet 131. .

The absorbent article of the present invention is not limited to the above-described embodiment, and can be appropriately changed as long as the gist of the present invention is not deviated.

For example, the main body absorbing layer is not limited to the laminated body of the main body surface sheet and the main body absorbing body, and can be composed of an integral member having both functions. Similarly, the flap absorbing layer is not limited to the laminate of the flap surface sheet and the flap absorber, and can be composed of an integral member having both possibilities.

The wing portion may not be provided with a wing absorber. In addition, the wing itself may not be provided.

The flap surface sheet and the wing surface sheet can be composed of a liquid impermeable or water repellent sheet.

The absorbent article of the present invention is not limited to a sanitary napkin, and can be applied to, for example, a pantiliner (mucus sheet) and an incontinence pad. The underwear in which the absorbent article of the present invention is mounted is not limited to the panties.

The ridge portion 132c provided in the upper sheet 132a has the opening portion 132e in the fifth embodiment, but is not limited thereto and may not have the opening portion 132e.

In the fifth embodiment, the flap surface sheet 131 is provided with a large number of protrusion openings 131a and small openings 131g, but these may not be provided at all.

Although the upper body absorbent body 123a was provided near the center of the longitudinal direction and the width direction of the absorbent body 102 in 5th Embodiment, it is not limited to this, To the rear of the longitudinal direction of the absorbent body 102. It may be extended. Furthermore, the flap absorber 133 and the lower body absorber 123b are formed separately, and the upper body absorber 123a which extends the inner portion in the width direction of the flap absorber 133 to the rear in the longitudinal direction of the absorbent body 102 and It can arrange | position between the lower main body absorber 123b. When the flap absorber 133 is arranged in this way, the used area formed by the upper body absorber 123a is stably maintained, and it is easy to fit in the gap between the hips located behind the crotch lower part of the wearer.

In the fifth embodiment, the main body absorber 123 is composed of a laminate of the upper main body absorber 123a and the lower main body absorber 123b, but is not limited thereto, and may have a single layer structure.

Each structure in each embodiment mentioned above can be combined suitably.

1 is a perspective view showing a sanitary napkin as a first embodiment of an absorbent article of the present invention.

FIG. 2 is a II-II cross-sectional view shown in FIG. 1. FIG.

3 is a III-III cross-sectional view shown in FIG. 1.

4 is a schematic partial enlarged view of FIG. 2.

Fig. 5 is a plan view showing the inner surface of the flap leakage preventing layer (flap back sheet).

It is a top view (FIG. 5 correspondence drawing) which shows the form for each recessed structure of a flap leak prevention layer.

It is sectional drawing (FIG. 2 correspondence drawing) showing the sanitary napkin as 2nd Embodiment of the absorbent article of this invention.

It is sectional drawing (FIG. 2 correspondence drawing) showing the sanitary napkin as 3rd Embodiment of the absorbent article of this invention.

It is sectional drawing which shows the rear flap in the sanitary napkin as 4th Embodiment of the absorbent article of this invention.

It is a top view which shows the arrangement form of a flap bonding material.

11A and 11B are plan views (FIG. 10 correspondence diagrams) showing an arrangement form for each flap bonding material, respectively.

It is a perspective view which shows the sanitary napkin as 5th Embodiment of the absorbent article of this invention.

FIG. 13 is a II-II cross-sectional view shown in FIG. 12. FIG.

FIG. 14 is a III-III cross-sectional view shown in FIG. 12. FIG.

Fig. 15 is a sectional view of the rear flap of the fifth embodiment.

FIG. 16 is a partially enlarged view of FIG. 15.

It is a perspective view which shows the flap surface sheet in 5th Embodiment.

Claims (14)

An absorbent article having a substantially longitudinal absorbent body having a main body absorbent layer and a main body leakage preventing layer, and a pair of rear flaps extending outward in the width direction on each of both sides of at least the rear part of the absorbent body, The rear flap is provided with a flap absorbing layer and a flap leak prevention layer, The flap leakage preventing layer is an absorbent article, characterized in that the surface of the flap absorption layer side has an uneven structure. The absorbent article as set forth in claim 1, wherein a concave-shaped structure is formed in the flap leakage preventing layer from the flap absorption layer toward the flap leakage prevention layer, so that the uneven structure of the flap leakage prevention layer is formed. . The absorbent article as set forth in claim 2, wherein the flap absorbing layer and the flap leak preventing layer are in discontinuous contact with each other in the planar direction by the concave structure of the flap leak preventing layer. The absorbent article according to claim 2 or 3, wherein the concave structure of the flap leakage preventing layer has a depth of 0.05 to 5 mm. The flap absorbing layer according to claim 2 or 3, wherein the flap absorbing layer comprises a flap surface sheet and a flap absorber. The flap absorber is formed in a sheet shape, and the density at the skin non-contacting surface side is lower than the density at the skin-contacting surface side. The flap absorbing layer according to claim 2 or 3, wherein the flap absorbing layer comprises a flap surface sheet and a flap absorber. An absorbent article as set forth in said back flap, wherein said flap surface sheet and said flap leak prevention layer are both bonded to said flap absorber. According to claim 1, wherein the body leakage prevention layer is made of a main body back sheet, the main body absorbing layer is composed of a main body surface sheet and a main body absorber interposed between the main body surface sheet and the main body back sheet, The flap leakage prevention layer is made of a flap back sheet, the flap absorbing layer is made of a flap surface sheet, and a flap absorber interposed between the flap surface sheet and the flap back sheet. The flap absorbent body and the flap back sheet are bonded to each other intermittently by a bonding material in a planar direction, whereby the uneven structure of the flap leakage preventing layer is formed. The absorbent article as set forth in claim 7, wherein the flap absorber is formed in a sheet shape, extends over the absorbent body, and is integrated with the main body absorber. The absorbent article according to claim 7 or 8, wherein the constituent fibers of the flap absorber protrude toward the sheet between the flap backsheets between the bonding materials intermittently arranged. The absorbent article as set forth in claim 8, wherein the density of the flap absorber is higher than the density of the main body absorber integrated therewith. According to claim 1, wherein the flap leakage prevention layer is made of a flap back sheet, the flap absorbing layer is made of a flap absorber interposed between the flap surface sheet and the flap surface sheet and the flap back sheet, The uneven structure of the flap leakage preventing layer is formed by the two-layer structure of the upper layer sheet having a plurality of ridges protruding toward the flap absorber and the lower layer sheet having breathability. Absorbent articles. The absorbent article as set forth in claim 11, wherein said raised portion of said upper sheet has an opening. The absorbent article as set forth in claim 12, wherein said upper layer sheet is in contact with said flap absorber in said opening portion. The flap surface sheet according to any one of claims 11 to 13, wherein the flap surface sheet is made of a film material, and a plurality of projecting openings protruding toward the flap absorber, and the opening area than the projecting openings. An absorbent article characterized by having many small micro pores.

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