JP6042181B2 - Absorbent articles - Google Patents

Description

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

The absorbent body of an absorbent article such as a sanitary napkin or a disposable diaper is generally in a substantially rectangular shape in which an absorbent material is continuously disposed so as to cover the excretion point of the wearer.
On the other hand, in Patent Documents 1 and 2, a plurality of absorbing parts are separated from each other and joined to the base sheet via a fixing part, and the fixing part is included in the area of the absorbing part in plan view. In addition, an absorber is disclosed in which the plurality of absorbing portions are arranged in a state where they can be in fluid communication with each other. With the techniques used in these documents, an absorbent body that is more flexible than a general absorbent body can be provided.

JP 2010-268919 JP 2010-273810 A

  However, the absorbers described in Patent Documents 1 and 2 have room for improvement in efficient liquid diffusion in the absorber and moisture and heat dissipation from the back surface.

  An object of the present invention is to provide an absorbent article that can quickly absorb and diffuse excreted liquid while maintaining the flexibility of the absorbent body, and that easily dissipates moisture and heat.

  The present invention is an absorbent article having a liquid-permeable surface layer on the skin contact surface, a leak-proof layer on the non-skin contact surface side, and an absorbent layer between the surface layer and the leak-proof layer, The layer has a separation portion having a groove on the skin contact surface side, and a small absorption portion having a higher basis weight than the separation portion partitioned by the separation portion, and the small absorption portion includes a non-skin The absorbent article which has the pressing recessed part which goes to the skin contact surface side on the contact side surface is provided.

  The absorbent article of the present invention can quickly absorb the liquid by the groove of the separation portion, and a dense gradient is formed inside the small absorption portion, so that the body fluid quickly migrates and diffuses throughout each small absorption portion. It becomes easy to generate | occur | produce and a bodily fluid can be widely fixed to the whole small absorption part. Moreover, humidity can be dissipated from both the skin contact surface side and the back surface side, and high moisture dissipating properties and heat dissipating properties can be realized.

FIG. 1 is a partially cutaway perspective view showing a sanitary napkin as an embodiment of the absorbent article of the present invention from the skin contact surface direction. 2 is a cross-sectional view taken along the line II of FIG. FIG. 3 is a plan view of one small absorbent portion of the sanitary napkin shown in FIG. 1 viewed from the non-skin contact surface direction. 4 (a) to 4 (c) are plan views for explaining the shape of the pressing recess according to another embodiment (corresponding to FIG. 3). 5 (a) to 5 (b) are plan views for explaining the shape of the pressing recesses of still another embodiment (corresponding to FIG. 3), and FIG. 5 (c) is a view taken along the line II- of FIG. 5 (b). It is II sectional view. FIG. 6 is a cross-sectional view for explaining a pressing recess according to still another embodiment. FIG. 7A is a plan view of an absorbent layer of a sanitary napkin according to another embodiment as viewed from the skin contact surface direction, and FIG. 7B is a view of the absorbent layer from the non-skin contact surface direction. FIG. Fig.8 (a) is the top view seen from the skin contact surface direction for demonstrating the shape of the pressing recessed part of the absorption layer with which the sanitary napkin of Example 6 is equipped, FIG.8 (b) is FIG.8 (a). 3 is a cross-sectional view taken along line III-III. FIG. 9A is a plan view of the absorbent layer provided in the sanitary napkin of Example 9 as viewed from the skin contact surface direction, and FIG. It is the top view seen from the skin contact surface direction.

A preferred embodiment of an absorbent article according to the present invention will be described with reference to the drawings.
FIG. 1 is a partially cutaway perspective view showing a sanitary napkin (hereinafter also referred to as “napkin”) as a preferred embodiment of the absorbent article according to the present invention from the skin contact surface direction.
The napkin 1 of the present embodiment has a vertically long shape as shown in FIG. 1 and is disposed on the surface layer 2 of the liquid-permeable sheet disposed on the skin contact surface side, on the non-skin contact surface side. The liquid-proof leak-proof layer 4 and the absorbent layer 3 that is disposed between the two sheets and absorbs and retains body fluids are provided. The absorbent layer 3 includes a core wrap 5 on the skin contact surface side and the non-skin contact surface side to form an absorbent main body 30. The surface layer 2 and the leak-proof layer 4 extend outward from the front and rear in the longitudinal direction and from the left and right in the width direction of the absorbent layer 3, and are joined and integrated at the overlapping portion. In addition, the leak-proof layer 4 is longer than the surface layer 2 in the laterally outer portion, and the skin contact surface side of the leak-proof layer 4 is covered with a water-repellent side sheet 9. In the present embodiment, the inner side in the width direction of the side sheet 9 overlaps with the surface layer 2, and also overlaps on both the left and right side portions of the absorbent layer 3. With this configuration, the area near the center in the width direction of the napkin 1 is liquid permeable, but water repellency is obtained in the left and right outer areas in the width direction, and the body fluid absorbed in the absorbent layer 3 is diffused in the left and right directions in the width direction. At the same time, the exudation of body fluid can be suppressed.

  In this specification, the surface in contact with the skin of the wearer is referred to as the skin contact surface, the surface opposite to this is referred to as the non-skin contact surface, and the surface relatively close to the skin contact surface is referred to as the skin contact surface. The contact surface side or upper side and the far side are referred to as the non-skin contact surface side or lower side. Further, both end directions in the longitudinal direction are also referred to as the front-rear direction, and both end directions in the width direction are also referred to as the left-right direction.

  The absorbent layer 3 in the napkin 1 has a vertically long shape, and as shown in FIG. 1, the longitudinal direction of the absorbent layer 3 coincides with the longitudinal direction (Y direction) of the napkin, and is closer to the center in the width direction (X direction) of the napkin 1. It is joined and arrange | positioned with the adhesive agent etc. at the skin contact surface side of a leak-proof layer so that it may be located in.

  As shown in FIG. 1, the absorbent layer 3 of the napkin 1 has a plurality of spacing portions 6 each having a groove 61 on the skin contact surface side and a basis weight higher than the spacing portions 6 divided by the spacing portions 6. Small absorption parts 32, 32,. . . And have. On the other hand, the groove 61 does not reach the non-skin contact surface side, and a continuous layer 31 is formed. Examples of the continuous layer 31 and the small absorbing portion 32 include a structure in which separate structures are joined by hot melt, heat sealing, or the like, and a structure in which both are physically continuous. The absorption layer 3 of the present embodiment is an integral structure formed by one volume fiber.

  The groove 61 will be described more specifically with reference to FIGS. 1 and 2. The groove 61 is a concave portion that is recessed from the skin contact surface side toward the non-skin contact surface side. That is, the groove 61 is a space portion where the constituent material of the absorption layer 3 is not disposed. In the present invention, the “absorbing layer” refers to a layer provided with a material necessary for absorbing and holding bodily fluids, and does not include a core wrap material for retaining the shape. The small absorption part 32 defined by the separation part 6 including the groove 61 that is a space part has a protruding absorption part structure that protrudes relatively to the skin contact surface side, and a plurality of them are independently aligned. . 2, when the absorption layer 3 is viewed in the thickness direction, the bottom of the groove 61 on the non-skin contact surface side is a recess absorption portion 33 as a part of the absorption layer 3, and the groove 61 and the recess The absorbing part 33 constitutes the separating part 6. The recessed portion absorbing portion 33 is thinner than the small absorbing portion 32 by the space of the groove 61, is unevenly distributed toward the non-skin contact surface side, and has a lower basis weight than the small absorbing portion 32. Therefore, the spacing portion 6 has a lower basis weight than the small absorption portion 32. The recess absorbing portion 33 and the small absorbing portion 32 are integrated by the continuous layer 31 on the non-skin contact surface side of the absorbing layer 3.

  In the napkin 1, as shown in FIG. 1, the groove 61 extends continuously in the longitudinal direction (Y direction) of the napkin 1 and the width direction (X direction) perpendicular thereto, and is surrounded by these four sides. A plurality of small absorbent portions 32, 32, which are integral with the continuous layer 31 and project toward the skin contact surface side. . . However, the absorption layer 3 is arranged in a so-called lattice shape. That is, the groove 61 extending in the longitudinal direction and the groove 61 extending in the width direction are disposed so as to reach the front and rear ends and the left and right ends of the region where the absorption layer 3 is present in plan view.

  In the present invention, “continuous” or “continuous” is not limited to the shape in which the grooves 61 are linearly connected as in the present embodiment, but includes various forms in which the gap formed by the grooves is not interrupted. . For example, the groove 61 may be arranged in a zigzag shape with the small absorbent portion 32, and the groove portion 61 is arranged radially outward from the center of the product so that the small absorbent portion 32 has a turtle shell shape or a fan shape. It may be a form to do. Moreover, the form which a width | variety changes in the middle of 61 series of a groove | channel may be sufficient, and the form by which small space like an adjustment valve is arrange | positioned in the middle may be sufficient.

  In the napkin 1, as shown in FIG. 1, the absorption layer 3 is partitioned by the groove 61, and the small absorption part 32 becomes easy to move. Thereby, it has the flexibility with respect to an external force. The napkin with this arrangement is extremely "physical compatible" that fits the undulations of the skin surface, and "motion followability" that can follow the wearer's movement well and hardly cause partial gaps with the skin. Get higher.

In the absorbent layer 3, the size and shape of the groove 61 and the small absorbent portion 32 are not uniquely determined because they differ depending on the size and purpose of use of the absorbent article. When the absorbent article is a napkin or a light incontinence pad, the size of the small absorbent portion 32 is preferably 0.25 cm ² or more, particularly 0.5 cm ² , preferably 25 cm ² or less, particularly 20 cm ² or less. Is preferred. Specifically, preferably 0.25 cm ² or more 25 cm ² or less, more preferably 0.5 cm ² or more 20 cm ² or less. It is preferable from a viewpoint that it can pressurize by pressing reliably and being able to provide a suitable coarse-dense gradient in the small absorption part 32 as it is more than a lower limit, and for discharging moisture efficiently as it is below an upper limit. It is preferable from the viewpoint that it becomes easy to secure the necessary number of grooves.

  Regarding the size of the groove 61, the width (r) of the groove 61 extending in the longitudinal direction is preferably 0.2 mm or more, particularly 0.5 mm or more, and preferably 5 mm or less, particularly 3 mm or less. By setting it to the above lower limit or more, the groove portion becomes a water channel and menstrual blood can flow here and efficiently diffuse into the absorbent body, and moisture accumulated between the skin and the napkin can be easily released to the outside air. By setting it to the upper limit or less, in addition to preventing the occurrence of leakage due to the menstrual blood flowing through the groove at a stretch, it is possible to prevent obstruction of liquid transmission between the small absorption parts 32. Further, the width (s) of the groove 61 extending in the width direction is preferably 0.25 mm or more, particularly 0.5 mm or more, and preferably 5 mm or less, particularly 3 mm or less. By setting it to the above lower limit or higher, moisture staying between the skin and the napkin can be easily released to the outside air, and by setting the upper limit or lower, leakage due to menstrual blood flowing through the groove 6b can be prevented.

  Further, the ratio of the depth of the groove 61 to the thickness of the entire absorption layer 3 is preferably 20% or more, particularly preferably 30% or more, and preferably 80% or less, particularly preferably 70% or less. By setting the above lower limit or higher, moisture staying between the skin and the napkin can be easily released to the outside air, and by setting the upper limit or lower, adjacent protruding absorbent parts are joined together by the concave absorbent part, and the absorbent layer is operated by the wearer. Can be prevented from breaking. It is possible to prevent leakage due to menstrual blood flowing through the groove. Specifically, 20% to 80%, particularly 30% to 70% is preferable. In addition, in the case of an absorption layer having a portion where the thickness is larger than other portions, such as a multilayer type absorption layer, if a groove is provided in the thick portion, the groove of the portion relative to the thickness of the portion As long as the depth is in the above range and a groove is provided in a portion having a small thickness, the depth of the groove with respect to the thickness of the portion may be in the above range.

  In the napkin 1 of the present invention, as shown in FIG. 2, the small absorbent portion 32 of the absorbent layer 3 is provided with a compressed recess 8 on the non-skin contact surface side toward the skin contact surface side. In the napkin 1 of this embodiment, it is set as the pressing recessed part 8 compressed with the core wrap 5 distribute | arranged to the non-skin contact surface side of the absorption layer 3. FIG. At least one pressing recess 8 is provided in each small absorbent portion 32. In this embodiment, each pressing recessed part 8 is provided so that it may fit in the inside of each block-shaped small absorption part 32. As shown in FIG. Due to the pressing recess 8, a high density region having a higher density than the outer region is provided in the peripheral portion of the pressing recess 8 in the small absorption portion 32. That is, in the small absorption part 32, there are a high density part having a relatively high density and a low density part having a low density. In the form of FIG. 2, there are high density portions in the skin contact surface side region in the thickness direction from the periphery of the pressing recess 8 and from the pressing recess 8. Due to this density gradient, the body fluid absorbed in the absorption layer 3 is easily guided to the high density portion. Around the high-density portion, there is a gap 81 due to the pressing recess 8. For this reason, a part of the body fluid gathered intensively in the high-density part is easily discharged from the gap to the outside of the non-skin contact surface side of the absorber. In addition, since the groove 61 and the high-density portion that define the small absorption portion are close to each other due to the presence of the compressed recess 8, a part of the body fluid becomes vapor and is led to the groove portion 61. It has a structure that makes it easy to be placed. For this reason, the steam in the napkin 1 is less likely to remain in one place, and moreover, the steam is less likely to remain between the wearer and the napkin 1 because the structure tends to concentrate on the non-skin contact surface side. It becomes difficult to feel a feeling.

  Thus, the napkin 1 of this embodiment can guide the absorbed bodily fluid quickly to the non-skin contact surface side of the napkin 1 to keep the bodily fluid away from the side close to the skin, as well as internal moisture retention and internal circulation structure of moisture. Thus, moisture release to the skin side can be suppressed, and humidity reduction between the skin and the skin can be effectively realized. Regardless of the amount of excretory fluid, a high dry feeling can be given to the wearer, and rough skin can be effectively reduced. In addition, if the internal circulation is more efficiently performed by the structure in which the groove 61 extends while intersecting the longitudinal direction and the width direction, it is effective for suppressing the stuffiness. Moreover, when the density of the small absorption part 8 is higher than the density of the separation part 6, when body fluid enters from the skin contact surface side of the absorption layer 3, the separation part 6 moves to the small absorption part side, Since it becomes easy to spread | diffuse, a bodily fluid does not accumulate easily on the surface, and it is easy to give a wearer a dry feeling.

  In the napkin 1, the compressed recess 8 has a circular opening as shown in FIG. 3 in a plan view on the non-skin contact surface side, and the non-skin contact in the thickness direction as shown in FIG. It is a shape that narrows from the surface side toward the skin contact surface side, that is, the area gradually decreases. That is, the pressing recess 8 shown in FIG. 3 has a shape in which the width continuously decreases from the non-skin contact surface side to the non-skin contact surface side. More specifically, a mortar shape as shown in FIG. 2 is preferable. By adopting such a shape, a density gradient is imparted toward the center even in the high density region, so that the liquid is easily guided from the low density part to the high density part in the small absorption part 32.

  As the shape of the opening of the compressed recess 8, instead of a circle, in a plan view from the non-skin contact surface side, an ellipse, a triangle, a square, a rhombus, so as to extend in at least one direction of the small absorbent portion 32, Various shapes such as a rectangle, a star shape, and a cross shape can be employed. Among these, the elliptical shape (FIG. 4 (a)) and the cross shape (FIG. 4 (b), FIG. 4 (c)) can increase the void surface area of the squeezing recess and easily secure the volume of the small absorbent part. In addition, since the density gradient in the small absorption part can be formed in a wider range, it is easy to realize both the suppression of stuffiness and the absorption performance. More specifically, the cross-shaped pressing recess 8 shown in FIGS. 4B and 4C is the longitudinal direction (Y direction) of the absorbent layer 3 in a plan view from the non-skin contact surface side. And it extends in the width direction (X direction) orthogonal to this. Furthermore, the cross-shaped pressing recessed part 8 shown in FIG.4 (c) has reached the edge part (outer periphery) of the small absorption part 32 by planar view from the non-skin contact surface side.

  Moreover, the several pressing recessed part 8 may be included per one small absorption part 32. FIG. For example, the form which arrange | positions so that an opening may arrange | position a circular pressing recessed part like FIG. 5 (a), and an annular opening-shaped pressing recessed part like FIG.5 (b), FIG.5 (c) on a concentric circle. The arrangement | positioning form, ie, the pressing recessed part 8, is a planar view by the side of a non-skin contact surface, and is a concentric ring shape. As a result, the distance between the high-density portion and the groove portion 61 formed in the outermost annular opening shape pressing concave portion can be reduced, and in addition to being advantageous for liquid movement, the inner side of the annular opening is also absorbed. Since there is a density gradient between the low basis weight part and the high basis weight part having the property, the overall absorption capacity and liquid diffusibility are enhanced as compared with a ring having no opening shape. Moreover, in this form, when comparing the high density region of the outermost annular opening shape pressing recess with another high density region due to the pressing recess existing inside the annular opening, the inner side has a higher density. It is preferable from the viewpoint of imparting a density gradient.

  When the pressing recess 8 is viewed in plan, the area of the opening of the pressing recess 8 is 1% or more, particularly 3% or more, and more preferably 10% or more with respect to the planar area of the non-skin contact surface side of the small absorbent portion 32. It is preferably 70% or less, particularly 60% or less, and more preferably 50% or less. Specifically, it is preferably 1% to 70%, particularly 3% to 60%, and more preferably 10% to 50%. When it is at least the lower limit, sufficient liquid conductivity can be easily obtained, and suppression of stuffiness due to vapor emission can be easily obtained. Further, when the amount is not more than the upper limit value, it is difficult to give an uncomfortable feeling to the wearer while the absorbent body maintains an appropriate softness while securing a sufficient liquid holding amount.

  The cross-sectional shape of the pressing recess 8 can employ various shapes in place of the mortar-like shape. For example, a mode (see FIG. 6) in which the length in the longitudinal direction or the length in the width direction decreases stepwise from the non-skin contact surface side in the figure. That is, the pressing recess 8 shown in FIG. 6 is discontinuously decreasing in width at least in one direction from the non-skin contact surface side to the skin contact surface side. By doing in this way, opening area as a vapor | steam discharge | release part is expanded, maintaining the absorption capacity | capacitance of the absorption layer 3, and since the skin surface side area of the small absorption part 3 is large, it is to the pressure received from a wearer. Resistance and migration of the liquid from the surface layer 2 to the absorption layer 3 can be maintained.

  The length in the thickness direction of the compressed recess 8 is preferably 50% or less, particularly 40% or less, of the entire thickness of the absorbent layer 3, from the viewpoint of securing a holding space for bodily fluids. Moreover, regarding the thickness direction, as shown in FIG. 2, the upper end of the pressing recess 8 is above the position of the lower end of the groove 61 when the pressing recess 8 is in the small absorbent portion 32. This makes it easy to quickly take the diffused body fluid transmitted through the groove 61 into the small absorption part, and further promote the transpiration of moisture from the non-skin contact surface side, thereby facilitating the reduction of stuffiness. It is preferable from the viewpoint. On the other hand, when the pressing recess 8 is present in the region of the recess absorbing portion 33, the upper end of the pressing recess 8 is preferably located below the lower end of the groove 6.

  2 is provided so as to be compressed and integrated with the core wrap 5 disposed on the non-skin contact surface side in the absorbent layer 3, but the compressed recess 8 is provided only in the absorbent layer 3. May be. When the core wrap 5 is squeezed into the absorbent layer 3 and integrated as shown in the compressed recess 8 shown in FIG. 2, it is effective to use a sheet having a basis weight as low as possible as the core wrap 5. It is preferable from the point which advances to. Examples of such core wrap 5 include nonwoven fabrics and pulp sheets having a basis weight of 200 g / m 2 or less. A pulp sheet (absorbent paper) having body fluid absorbability is preferred.

  Furthermore, in this invention, the structure of the absorption layer 3 is not limited to 1 layer of this embodiment, As long as there exists the said effect | action, you may make it into 2 or more layers.

  The constituent material of the absorbent layer 3 is not particularly limited, and a fiber material, a porous body, a combination thereof, or the like can be used. Examples of fiber materials include natural fibers such as wood pulp, cotton, and hemp, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, and single fibers made of synthetic resins such as polyvinyl alcohol resin, and these resins. Bisynthetic fibers containing two or more of them, and semisynthetic fibers such as acetate and rayon can be used. When using a fiber made of a synthetic fiber, the fiber may be a heat-shrinkable fiber whose shape changes due to heat. For example, heat may increase the fineness but shorten the fiber length, or the fineness may hardly change, but the shape may change to a coil shape and the length occupied by the apparent fiber may be shortened. . As the porous body, sponge, non-woven fabric, aggregate of superabsorbent polymer (aggregate of superabsorbent polymer and fiber) and the like can be used. As a preferable absorbent layer, a mixed laminate of pulp fibers and a superabsorbent polymer, which is coated with an absorbent paper as the core wrap 5, is particularly preferable.

  As the surface layer 2, various nonwoven fabrics (for example, air-through nonwoven fabric, spunbond nonwoven fabric, etc.) alone or a plurality of laminated structures, or a composite sheet in which a large number of apertures are formed by laminating a nonwoven fabric and a film. Etc. are used. Further, the surface layer may be composed of an upper layer and a lower layer having the projections described above, or may be composed of a undulating upper layer and a flat lower layer. In this case, it is preferable because a density gradient of fibers can be formed on the surface sheet, and the liquid on the surface sheet 1 can be quickly transmitted to the absorber side. As an upper layer and lower layer member, a fiber assembly in which fibers such as a web formed by a card method or a bulky nonwoven fabric are entangled very loosely can be used, and a web formed by a card method as a lower layer member Or a nonwoven fabric having heat shrinkability can be used.

The leak-proof layer 4 can be a moisture permeable film alone, a laminate of a film and a nonwoven fabric, or a water-repellent nonwoven fabric (SMS, SMMS, etc.). It is most preferable to use a moisture permeable film alone as a leak-proof material from the viewpoint of cost and matching with an anti-displacement adhesive. As the film material in this case, a film obtained by melt-kneading a thermoplastic resin and an inorganic filler that is not compatible with the thermoplastic resin and extruding the film to a predetermined size to make fine holes, or essentially moisture The non-porous film which is highly compatible and can discharge water vapor, such as a permeable membrane. In order to realize a leak-proof layer that fully expresses the performance of moisture discharge related to the present invention and does not ooze out moisture, the moisture permeability should be in the range of 0.7 to 3.0 g / m 2 · 24 hr. Is preferable, and it is further more preferable that it exists in the range of 1.0-2.5 g / m <2> * 24hr. From the viewpoint of sufficiently improving the smoothness, it is most preferably 1.5 to 2.5 g / m 2 · 24 hr. Moreover, in order to be able to use without troubles, such as a tear of a film, a film basic weight is 18-70 g / m < ² >, More preferably, it is 25-60 g / m < ² >. Moreover, a preferable inorganic filler compounding quantity is 30-65 mass% as a mass% of the filler with respect to the mass of the whole film, More preferably, it is 40-60 mass%.

In addition, the moisture permeability of the sheet material was measured according to the moisture permeability test method of JIS Z0208 moisture-proof packaging material at a temperature condition of 35 ° C. Specifically, a moisture absorbent (calcium chloride) is first placed in a moisture permeable cup, a test piece cut to a diameter of 70 mm is placed on the mouth of the moisture permeable cup, the packing and ring are fixed with a wing nut, The joint between the wet cup and the sample was sealed with a vinyl adhesive tape to obtain a test specimen. This specimen was left in a constant temperature and humidity apparatus at 35 ± 2 ° C. and 90 ± 5% RH for a predetermined time. 1 hour after the removed specimens to measure the mass again placed in the constant temperature and humidity in the apparatus after the measurement, and measuring the mass taken out after 4 hours, by the following equation, the moisture permeability, the sheet (1 m ² per) It calculated | required as mass (g) of the water vapor | steam which passed.
Moisture permeability (g / m2 · 24h) = (240 × m) / (ts · s)
s: Moisture permeable area (cm2)
t: total time of last two weighing intervals tested (h)
m: the sum of the last two weighing intervals and the increased mass (mg)

  The absorbent article of the present invention is not limited to the sanitary napkin of the above embodiment, and can be applied to disposable diapers, urine pads, incontinence pads, incontinence liners, and the like. It is also effective for not only menstrual blood but also urine, vaginal discharge, loose stool, and the like. In addition to the surface layer, the absorption layer, the leak-proof layer, and the side sheet, a member may be appropriately incorporated in accordance with the application and function. In addition, the material of the surface layer of the sanitary napkin of the said embodiment, an absorption layer, and a leak-proof layer, the conditions in a manufacturing method, the dimension of a product, etc. are not specifically limited, Various materials currently used in the normal sanitary napkin etc. Can be used.

  Further, in the sanitary napkin 1 of the above embodiment, as shown in FIG. 1, the groove 61 extends in the longitudinal direction (Y direction) and the width direction (X direction) of the napkin, and includes the groove 61. The separation portion 6 also extends in the longitudinal direction (Y direction) and the width direction (X direction) of the napkin, but, for example, in a plan view of the absorption layer 3 like the absorption layer 3 shown in FIG. The gap portion 6 (groove 61) may be arranged so as to extend radially from the center of the absorption layer 3 in the circumferential direction. When the gap 6 (groove 61) is arranged so as to extend radially, the pressing recess 8 may be arranged so as to intersect with the plurality of separation parts 6 (groove 61) as shown in FIG. . By arranging the separating portion 6 (groove 61) and the pressing recess 8 of the absorbent layer 3 in this way, it becomes easy to promote moisture transpiration from the non-skin contact surface side over a wide range of the absorbent layer 3. There is an effect that further reduction can be promoted.

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1> An absorbent article having a liquid-permeable surface layer on the skin contact surface, a leak-proof layer on the non-skin contact surface side, and an absorbent layer between the surface layer and the leak-proof layer, Has a gap portion on the skin contact surface side and a small absorbent portion having a higher basis weight than the gap portion partitioned thereby, and the small absorbent portion has a skin on the non-skin contact side surface. An absorptive article which has a pressing crevice which goes to the contact side.

<2> The absorption layer is formed such that the skin contact surface side and the non-skin contact surface side are covered with a core wrap, and the pressing recess includes the core wrap on the non-skin contact surface side. The absorbent article as described in>.
<3> The absorbent article according to <1> or <2>, wherein the pressing recess extends in at least one direction of the absorbent layer in a plan view from the non-skin contact surface side.
<4> The absorbent layer has a vertically long shape, and the compressed recess extends in the longitudinal direction of the absorbent layer and the width direction perpendicular thereto in plan view from the non-skin contact surface side. The absorbent article as described.

<5> The groove includes a longitudinal groove disposed along the longitudinal direction of the absorbent layer, and the width of the longitudinal groove is 0.2 mm or more and 5 mm or less, and any one of the above items <1> to <4> Absorbent articles described in 1.
<6> The groove includes a width direction groove extending across the absorbent layer along a width direction that is a direction orthogonal to the length direction, and the width direction groove intersects the length direction groove. Said <5
The absorbent article as described in>.
<7> The absorbent article according to <6>, wherein the widthwise groove has a width of 0.25 mm to 5 mm.
<8> Any one of the above <1> to <7>, wherein the compressed recess reaches the end of the small absorbent portion in a plan view from the non-skin contact surface side. Absorbent article as described in 1.
The <9> said pressing recessed part is described in any one of said <1>-<8> which goes to the skin contact surface side from the non-skin contact surface side, and the width | variety of at least one direction reduces discontinuously. Absorbent article.
<10> The absorbent article according to <1> to <9>, wherein the pressing recess has a shape in which the width continuously decreases from the non-skin contact surface side to the non-skin contact surface side.

<11> The absorbent article according to any one of <1> to <10>, wherein a plurality of the compressed concave portions are included in one small absorbent portion.
<12> The absorbent article according to <11>, wherein the pressing recess is a concentric ring shape in a plan view from the non-skin contact surface side.
<13> In plan view, the gap portion extends radially from the center of the absorption layer toward the periphery,
The absorbent article according to <1>, wherein the compressed recess intersects the plurality of gaps.
<14> The absorbent article according to any one of <1> to <13>, wherein the leak-proof layer is a moisture-permeable film.
<15> The pressing portion according to any one of <1> to <14>, wherein the pressing portion is provided with an opening area of 1% or more and 70% or less per flat area of the non-skin side surface of the small absorbent portion. Absorbent article.
<16> The absorbent article according to any one of <1> to <15>, wherein the absorbent article is a sanitary napkin or an incontinence pad.

  The present invention will be described below in more detail based on examples, but the present invention should not be construed as being limited thereby.

[Example 1]
Remove the film that constitutes the absorber (the structure including the absorbent layer and the core wrap in the present invention) and the leak-proof layer from the commercially available sanitary napkin (trade name “Lorrieev for many days to ordinary days”) of Kao Corporation A sanitary napkin for evaluation was obtained by disposing an after-mentioned absorbent layer test body and a leak-proof moisture-permeable film at each position of the removed absorber and leak-proof layer and restoring the others.

Leak-proof moisture-permeable film Moisture permeability is 2.0 g / m 2 · 24 h, film basis weight is 40 g / m 2, and the inorganic filler content is 50% by weight of moisture-permeable film as filler mass% with respect to the total film mass. .

Absorbent body specimen A piled fiber of a pulp fiber and a superabsorbent polymer having a basis weight of 240 g / m 2 of the small absorbent portion 32 (unpressed state) and a basis weight of 112 g / m 2 of the recessed portion absorbent portion 33 was obtained. This fiber stack was covered with an absorbent paper as a core wrap 5, passed between a pair of press rolls and compressed with a pressure of 3.0 kgf / cm 2, and the obtained absorbent body was used as a prototype of an absorbent body test body. The density of the small absorption part 32 was 0.12 g / cm <3>, and the density of the recessed part absorption part 33 was 0.08 g / cm <3>. The basis weight of the region 38 was 240 g / m2, and the basis weight of the region 39 was 112 g / m2. Moreover, the thickness of the recessed part absorption part 33 was 1.4 mm, and the thickness of the small absorption part 32 was 2.0 mm. The size of the small absorbing portion was a horizontal width T = 8 mm and a vertical width S = 12 mm.
In the prototype of this absorbent body test body, one pressing recess 8 was applied to each small absorbent part from the top of the absorbent paper on the non-skin contact surface side in the center of the small absorbent part. The pressing recess was a perfect circle shown in FIG. 3, the opening size was 1.5 mm in diameter, the thickness of the small absorbing portion in the pressing recess was 0.4 mm, and the density was 0.60 g / cm ³ .

[Example 2]
For the absorbent body specimen of Example 1, the shape of the pressing recess is shown in FIG. 4 (a) with a major axis extending in the longitudinal direction in a plan view on the non-skin contact surface side and a minor axis of 1.5 mm in the width direction. A sanitary napkin was prepared in the same manner except that the ellipse was changed.

Example 3
A sanitary napkin was prepared using an absorbent specimen obtained by changing only the following points of the absorbent specimen of Example 1. As shown in FIG.4 (b), the shape of a pressing recessed part is made into the cross pattern extended to both the longitudinal direction and the width direction of an absorptive main body by the non-skin contact surface side planar view, One by one. In addition, the compression recessed part made the extension length of the longitudinal direction and the width direction 6 mm, and the width 1.5 mm.

Example 4
A sanitary napkin was prepared using an absorbent specimen obtained by changing only the following points of the absorbent specimen of Example 1. As shown in FIG. 4 (c), the compressed recess shape has a longitudinal extension length of 12 mm and a width extension length of 8 mm in the non-skin contact surface side plan view. Reached the end of the part.

Example 5
A sanitary napkin using an absorbent test body obtained by changing only the following points from the absorbent test body of Example 1 was prepared. The shape at the opening of the pressing recess is 3 mm in diameter, and the cylindrical shape of the same diameter is maintained from there to the depth of 0.6 mm on the skin contact surface side, and then the depth of 0.4 mm is 1.5 mm in diameter. As shown in FIG. 6, it was set as the pressing recessed part shape which makes a step shape in a cross sectional view as shown in FIG. The staircase shape means that the emboss is deepened discontinuously toward the center on a certain virtual axis. In the present embodiment, when the pressing recess is viewed in plan from the non-skin contact surface side, cylindrical portions having different radii are arranged concentrically.

Example 6
With respect to the absorbent specimen of Example 1, as shown in FIGS. 8A and 8B, a sanitary napkin was obtained in the same manner except that the concave shape was changed to a mortar shape in cross-sectional view. The mortar shape means that the emboss depth in the emboss is continuously deeper toward the center in a certain virtual axis. In this embodiment, the shape of the opening of the compressed recess is a perfect circle, the portion of the same depth in the emboss is concentric with the opening in plan view, and the shape of the embossed recess is conical. is there. The diameter at the opening was 3 mm, and the diameter gradually decreased from that. The diameter at the deepest position was 1.5 mm, and the thickness of the small absorber was 0.4 mm.

Example 7
As for the absorbent body test body of Example 1, the number of pressing recesses is the same as that for sanitary use except that only four points are provided for one small absorbent section as shown in FIG. 5 (a). Created a napkin. In addition, all the pressing recessed parts were given to the center area | region of the small absorption part. The size of the pressing recess was 1 mm in diameter, and the thickness of the small absorbing portion in the pressing recess was 0.4 mm. Two in the longitudinal direction and two in the width direction were arranged in parallel. The distance from the center of the pressing recess in the longitudinal direction to the center of the other pressing recess was 4 mm, and the distance from the center of the pressing recess in the width direction to the center of the other pressing recess was 2 mm.

Example 8
For the absorbent body specimen of Example 1, the shape of the pressing recess is changed to two concentric rings in a non-skin contact surface side plan view, as shown in FIGS. 5 (b) and 5 (c). A napkin for organizing was prepared in the same manner as described above. An annular shape having a line width of 1 mm and an outer edge diameter of 3 mm (that is, an inner edge diameter of 1 mm) and an annular shape having a line width of 1 mm and an outer edge diameter of 7 mm (that is, an inner edge diameter of 5 mm) are arranged in a concentric circle. The center was the center of the small absorption part.

Example 9
A sanitary napkin was obtained in the same manner except that the gap and embossed shape as shown in FIG. 9 were used in place of the absorbent specimen of Example 1. Specific dimensions are as shown in FIG.

[Comparative Example 1]
A sanitary napkin was prepared in the same manner as in Example 1 except that the absorbent test body described in the example of Patent Document 1 was used as the absorber.

[Comparative Example 2]
A sanitary napkin was prepared in the same manner as in Example 1 except that the absorbent test body described in Example 1 of Patent Document 2 was used as the absorbent.

[Performance evaluation]
<Absorptive test method>
The napkins prepared in Examples 1 to 9 and Comparative Examples 1 and 2 were placed horizontally, and a cylindrical acrylic plate with an inlet having a diameter of 1 cm was placed on the bottom, and defibrinated horse blood (Nippon Biotest ( 5 g) was injected, and the state was maintained for 1 minute after the injection. Next, the acrylic plate with a cylinder was removed, and 16 sheets of absorbent paper (commercial tissue paper) having a length of 6 cm × width of 9.5 cm and a basis weight of 13 g / m 2 were placed on the surface of the top sheet. Further, a weight was placed thereon so that the pressure was 4.0 × 10 2 Pa, and pressurization was performed for 5 seconds. After pressurization, the absorbent paper was taken out, the weight of the paper before and after pressurization was measured, and the weight of defibrinated horse blood absorbed by the absorbent paper was measured to obtain the remaining amount of surface liquid.
The surface liquid remaining amount of 100 mg or more was designated as C, 75 mg or more and less than 100 mg as B, 50 mg or more and less than 75 mg as A, and less than 50 mg as A +.

<Diffusion test method>
The diffusion area on the skin contact surface side of the absorbent layer after the absorption test method was completed was measured. For the measurement, the diffusion state immediately after the end of the above-mentioned test is recorded by various cameras (preferably one in which the photographing data is digitized), the contour of the diffusion is marked, and the image analysis device ( Their diffusion areas were determined using NEXT US: NEW CUBE Ver. 4.20). Less than 25cm ² C, 25cm ² or more 30cm less than ² B, less than 30~25cm ² A, 35cm ² or more was A +.

<Test method for moisture release>
The napkin after the end of the test method for absorbency is placed in an environment where the surface material side is in contact with the acrylic plate in an environment of 30 ° C. and 65% RH, and the weight change of the product is measured when left for 8 hours. The ratio of the amount to Comparative Example 1 was taken, and 1 or more and less than 1.05 was C, 1.05 or more and less than 1.10 was B, 1.10 or more and less than 1.20 was A, and 1.20 or more was A +. .

  As is clear from the results shown in Table 1, the sanitary napkins of Examples 1 to 9 were compared with the sanitary napkins of Comparative Examples 1 and 2 in any aspect of absorbability, diffusibility, and moisture release, I found it excellent.

1 Sanitary napkin (absorbent article)
2 Surface layer 3 Absorbent layer 30 Absorbent body 31 Continuous layer 32 Small absorbent part 33 Concave absorbent part 4 Leak-proof layer 5 Core wrap sheet 6 Separating part 61 Groove 8 Squeezed concave part 81 Cavity 9 Side sheet

Claims (9)

An absorbent article having a liquid-permeable surface layer on the skin contact surface, a leak-proof layer on the non-skin contact surface side, and an absorbent layer between the surface layer and the leak-proof layer,
The absorbent layer has a separation part having a groove on the skin contact surface side, and a small absorption part having a higher basis weight than the separation part partitioned by the separation part,
The groove does not reach the non-skin contact surface of the absorbent layer,
The absorbent article which has the pressing recessed part which goes to the skin contact surface side in the said non-skin contact side surface in the said small absorption part.   2. The absorbent article according to claim 1, wherein the pressing recess extends in at least one direction of the small absorbent portion in a plan view from the non-skin contact surface side.   The absorption according to claim 2, wherein the absorbent layer has a vertically long shape, and the compressed recess extends in a longitudinal direction of the absorbent layer and a width direction orthogonal thereto in a plan view from the non-skin contact surface side. Sex goods.   The absorptive article according to any one of claims 1 to 3 in which said pressing crevice has reached the end of said small absorption part by plane view from the non-skin contact surface side.   The absorptive article according to any one of claims 1 to 4, wherein the compressed recess is directed from the non-skin contact surface side to the skin contact surface side, and the width in at least one direction decreases discontinuously.   The absorbent article according to any one of claims 1 to 4, wherein the pressing recess has a shape in which a width continuously decreases from the non-skin contact surface side toward the non-skin contact surface side.   The absorbent article according to any one of claims 1 to 6, wherein a plurality of the compressed recesses are included in one small absorbent part.   The absorptive article according to claim 7 in which said pressing crevice is a concentric ring shape by plane view on the non-skin contact side. 2. The absorbent article according to claim 1, wherein in the plan view, the spacing portion extends radially from the center of the absorbent layer in the circumferential direction, and the compressed recess intersects the plurality of spacing portions.

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