JP6271186B2 - Absorbent articles - Google Patents

Description

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

  In absorbent articles such as sanitary napkins, the material and structure of each member have been improved to improve its function and wearing feeling. The absorber has also been developed with the aim of such improvement, and in recent years, various types of functional materials have been proposed according to the usage situation and the type of absorbent article.

  In Patent Document 1, a plurality of absorption parts are separated from each other and joined to a base sheet via a fixing part, and the fixing part is included in the area of the absorption part in a plan view, and the plurality of absorption parts Describes a sanitary napkin having an absorbent body arranged in a fluid communication with each other. Further, in Patent Document 2, a plurality of absorbing parts are separated from each other and joined to a base sheet via a fixing part, and the fixing part is included in the area of the absorbing part in plan view, and the absorbing part A sanitary napkin having an absorbent body, in which an absorbent material is disposed between the absorbent parts, and the basis weight of the absorbent material disposed between the absorbent parts is lower than the absorbent part is described. Yes. In any of Patent Documents 1 and 2, the entire body of the absorbent body is flexibly deformed, and the “human body compatibility” that fits the wearer's complex undulating skin surface without gaps is extremely high. In addition, it is said that the absorption retention of liquid or the like at the time of deformation can be improved in an absorbent body that also has a very good “operation followability”.

JP 2010-268919 A JP 2010-273810 A

  In the absorbent articles described in Patent Document 1 and Patent Document 2, a plurality of absorbent parts are separated from each other and fixed to a base sheet as a continuous layer, so that liquid can be interposed between the separated absorbent parts and the absorbent parts. It can lead to quick communication and easy diffusion. On the other hand, separately from contact with the liquid, the body fluid taken into the absorbent body may evaporate to the skin side. In particular, when the amount of liquid retained in the absorbent body becomes saturated due to wearing for a long time or the like, evaporation to the space on the skin side is likely to occur. Depending on the degree of evaporation, the humidity on the skin side may increase and become a burden on the skin.

  In view of the above points, it is an object of the present invention to provide an absorbent article that can make the skin side less stuffy and reduce the burden on the skin.

  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 a liquid absorption layer between the surface layer and the leak-proof layer. The liquid absorption layer includes a continuous layer that includes the skin contact side surface and continues in the planar direction, and a plurality of small absorption portions that are continuously integrated with the liquid absorption layer and protrude toward the non-skin contact surface side. Each of the small absorption parts is separated by a separation part having a basis weight lower than that of the small absorption part, and the separation part does not penetrate the skin contact surface of the liquid absorption layer, and the small absorption part is not in contact with the small absorption part. The present invention provides an absorbent article provided with a squeezed portion that is recessed from the skin contact surface side toward the skin contact surface side.

  The absorbent article of the present invention is provided with a small absorbent part that is divided by a separation part, and by providing a region having a higher density than the surrounding by compression on the non-skin surface side provided in the small absorbent part, more body fluid The fixability of the can be improved, and a higher dry feeling can be provided to the wearer. Furthermore, the moisture in the absorbent article derived from body fluids and the like is released through the groove of the separation portion, and an effect of reducing the feeling of stuffiness is achieved.

It is the partially cutaway perspective view which showed the sanitary napkin as preferable one Embodiment of the absorbent article in this invention from the skin contact surface direction. It is the figure which showed typically the structure of the absorber which concerns on this embodiment, (A) is the perspective view shown from the surface which becomes a skin contact surface side, when arrange | positioning to a napkin, (B) Is a cross-sectional view in the width direction, and (C) is a perspective view (viewed from a non-skin contact surface when disposed on a napkin) as viewed from the bottom surface side. It is the II sectional view taken on the line in FIG. It is explanatory drawing which shows typically the moisture absorption of a water | moisture content and the transpiration | evaporation behavior in the absorber of this invention. It is the top view shown from the non-skin contact surface side of an absorber about the modification of the groove | channel of the absorber in this invention.

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”) 1 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. A liquid-impervious leak-proof layer 4 and a liquid-absorbing layer 3 that is disposed between the two sheets and absorbs and retains body fluids are provided. The surface layer 2 and the leak-proof layer 4 extend outwardly from the front and rear in the longitudinal direction and from the left and right in the width direction of the liquid absorption layer 3, and are joined and integrated at the overlapping portions. Moreover, the leak-proof layer 4 is longer than the surface layer 2 in the left-right direction outer part, and the skin contact surface side of the leak-proof layer 4 is covered with a water-repellent side sheet 5. In the present embodiment, the inner side in the width direction of the side sheet 5 overlaps the surface layer 2, and also overlaps at both the left and right side portions of the liquid absorbing 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 liquid absorbing layer 3 is diffused in the left and right directions in the width direction. Also, the oozing 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 side and the far side are called the non-skin contact 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 liquid absorbing layer 3 in the present embodiment has a substantially rectangular shape, and as shown in FIG. 1, the longitudinal direction of the liquid absorbing layer 3 coincides with the longitudinal direction (Y direction) of the napkin, and the width direction (X direction) of the napkin 1 is aligned. It is joined and disposed on the skin contact surface side of the leak-proof layer with an adhesive or the like so as to be located closer to the center. Moreover, as shown in FIGS. 2 (A) to 2 (C), in the liquid absorption layer 3, the skin contact surface side and the non-skin contact surface side of the absorption core 31 are covered by the core wrap sheet 32. Structure.

  The liquid absorption layer 3 of the present embodiment includes a continuous layer 6 that includes a skin contact side surface and continues in the plane direction, and a plurality of small absorption portions 8 that are continuously integrated with the liquid absorption layer 3 and protrude toward the non-skin contact surface side. It has. Specifically, the liquid absorption layer 3 includes a continuous layer 6 that includes a skin contact surface and is continuous in a planar direction, and a plurality of portions separated by a separation portion 7 that includes a groove 71 on the non-skin contact surface side. The small absorption parts 8,8 ... are provided and the absorption core 31 comprised is comprised. The separation part 7 includes a groove 71 and a recess absorption part 72 located on the skin contact surface side. For this reason, the skin contact surface side of the liquid absorption layer 3 is a flat continuous layer 6 (FIGS. 2A and 2B), and the non-skin contact surface side is formed by the groove 71 and the small absorption portion 8. It has an uneven shape (see FIGS. 2B and 2C). The continuous layer 6 and the small absorbent portion 8 are of an integral structure in which both are physically continuous, and are different from those in which separate layers are integrated by a joining means.

The groove 71 will be described more specifically. The groove 71 is a recess that is recessed from the non-skin contact surface side of the absorbent core 31 toward the skin contact surface side. That is, this portion is a space portion where the constituent material of the absorbent core 31 is not disposed. The portion of the absorbent core 31 partitioned by the groove 71 that is a space portion has a structure that can also be referred to as a protruding absorption portion 81 that protrudes relatively to the non-skin contact surface side, and a plurality of them are independently aligned and arranged. Yes. Further, when the liquid absorbing layer 3 is viewed in the thickness direction, the upper part of the groove 71 on the skin contact surface side is a recessed portion absorbing portion 72 as a part of the absorbing core 31. The recessed portion absorbing portion 72 is thinner than the small absorbing portion 8 by the space of the groove 71 and is unevenly distributed toward the skin contact surface side. For this reason, the spacing portion 7 has a smaller basis weight than the adjacent small absorbing portion 8. Moreover, the small absorption part 8 is a structure including the protrusion absorption part 81 and the part of the continuous layer 6 continuous with this in the thickness direction. Therefore, the recessed part absorption part 72 and the small absorption part 8 become the continuous layer 6 in the skin contact surface side of the liquid absorption layer 3, and form a flat surface (refer FIG. 2 (A)).

  In the napkin 1, the groove 71 continuously extends in the longitudinal direction (Y direction) of the napkin 1 and the width direction (X direction) perpendicular to the longitudinal direction, and is surrounded by these blocks. The small absorption part 8 is integral with the continuous layer 6, and a plurality of small absorption parts 8, 8... Convex toward the non-skin contact surface side are arranged in a so-called lattice shape. It is configured. The longitudinal direction groove 71a and the width direction groove 71b are disposed so as to reach the front and rear ends and the left and right ends of the region where the absorbent core 31 is present when viewed in plan. In the napkin 1, the groove 71 extends longitudinally through the liquid absorbing layer 3 along the longitudinal direction.

  In the present invention, “continuous” or “continuous” is not limited to the shape in which the grooves are linearly connected as in this embodiment, but includes various forms in which the gaps formed by the grooves are not interrupted. For example, it may be arranged in a zigzag or turtle shell shape, the width may change in the middle of a series of grooves, and a small space such as a regulating valve may be arranged in the middle. Also good.

  In the napkin 1, the liquid absorption layer 3 is partitioned by the groove 71, and the small absorption part 8 becomes easy to move. Thereby, it has flexibility with respect to external force. The sanitary napkin with this arrangement fits the body to fit the undulations of the skin, and also follows the movement of the wearer to make it difficult to create a partial gap with the skin. Becomes extremely high.

In the absorbent core 31, the size, shape, and the like of the groove 71 and the small absorbent portion 8 differ depending on the size and purpose of use of the absorbent article, and therefore are not uniquely determined. In the case of a sanitary product or a light incontinence pad, the size of the small absorbent portion 8 is preferably 0.25 cm ² or more, particularly 0.5 cm ² , preferably 25 cm ² or less, particularly preferably 20 cm ² or less. 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 the viewpoint of being able to pressurize by squeezing reliably when it is the lower limit value or more, and being able to provide an appropriate coarse / dense gradient in the small absorption part, and it is necessary for efficiently discharging moisture if it is the upper limit value or less. It is preferable from the viewpoint that it becomes easy to secure the number of grooves. In addition, a magnitude | size here is an area in planar view (area of the non-skin side surface when there is no opening part by the pressing part 10).

  Regarding the size of the groove 71, the width (r) of the longitudinal groove 71a 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 lower limit value or more, it becomes easy to release moisture accumulated between the skin and the napkin to the outside air, and by setting it to the upper limit value or less, it is possible to prevent leakage due to menstrual blood flowing at once. Further, the width (s) of the width direction groove 71b is 0.25 mm or more, particularly 0.5 mm or more, preferably 5 mm or less, particularly 3 mm or less (see FIG. 2). By setting the lower limit value or more, moisture staying between the skin and the napkin can be easily released to the outside air, and by setting the upper limit value or less, it is possible to prevent the occurrence of leakage due to menstrual blood flowing through the groove 71 at once. it can. In addition, although the said preferable width should just be the said range in the width | variety in the edge by the side of the non-skin contact surface of the groove | channel 71, it is still more preferable that it is the said range over the width direction whole region of the groove | channel 71.

  The ratio of the depth of the groove 71 (that is, the distance from the end on the non-skin contact surface side of the groove 71 to the end on the skin contact surface side that is the bottom) with respect to the thickness of the entire absorbent core 31 is 20% or more, In particular, 30% or more is preferable, 80% or less, particularly 70% or less is preferable (see FIG. 2B). By setting it as the said lower limit or more, the moisture stayed between the skin and the napkin can be easily released to the outside air. Can be prevented from breaking by the wearer's action. In addition, leakage due to menstrual blood flowing through the groove at a stretch can be prevented. In addition, in the case of a liquid absorption layer having a part where the thickness is larger than other parts, such as a multilayer type liquid absorption layer, if a groove is provided in the thick part, the thickness of the part The depth of the groove may be in the above range. On the other hand, if 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, the liquid absorbing layer 3 is provided with a squeezed portion 10 from the non-skin contact surface side of the small absorbent portion 8 toward the skin contact surface side. Although the pressing part 10 should just be provided in the small absorption part 8 in the area | region (henceforth an excretion part opposing area | region) which opposes a wearer's excretion part, Preferably at least 1 is provided in each small absorption part 8. Is provided. In the napkin 1 of this embodiment, each small absorption part 8 is provided with a plurality of pressing parts 10. In this embodiment, each pressing part is provided so that it may fit in each block-shaped small absorption part 8. FIG. FIG. 2B schematically shows a region where the density is high and a region where the density is low. In the napkin 1, a high-density region having a higher density than that of the outer side of the compressed portion 10 is provided in the small absorbent portion 8 by the compressed portion 10. That is, in the small absorption part 8, 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 (B), a high-density part exists in the area | region of the skin contact surface side in the thickness direction from the pressing part 10 circumference | surroundings and the pressing part 10. FIG. Due to this density gradient, the body fluid absorbed in the liquid absorbing layer 3 is easily guided to the high density portion. Around the high-density portion, there are voids 11 due to the compressed portion 10. For this reason, a part of body fluid gathered intensively in the high-density part is easily discharged as vapor from the gap 11. In addition, since the groove 71 that partitions the small absorption 8 and the high-density portion are close to each other due to the presence of the squeezed portion 10, a part of the body fluid becomes steam and is led to the groove 71. It has a structure that makes it easy to do. For this reason, the steam in the napkin 1 is less likely to stay in one place, and is more likely to concentrate on the non-skin contact surface side, so that it is difficult for the steam to remain between the wearer and the napkin 1. It becomes difficult to feel a feeling. In addition, since the liquid absorption layer 3 of the present invention is configured such that the small absorption portion 8 and the continuous layer 6 constituting the skin contact side surface are continuously integrated, the body fluid absorbs and diffuses after contacting the absorber. The process is performed smoothly and the above effects are easily obtained.

  Further, FIG. 4 shows the moisture absorption and transpiration behavior due to the difference in surface area between the napkin of the present invention and the conventional flat absorbent body on the non-skin contact surface side. In the case of a flat absorbent body, the moisture of the absorbed body fluid can be released only through the flat surface in contact with the outside world, whereas the product of the present invention has a large surface area on the non-skin contact surface side and promotes moisture absorption and transpiration. It is effective in preventing transpiration to the skin side. In particular, in the napkin 1, since the pressing part 10 integral with the absorption core 31 and the core wrap 32 is provided, the liquid can easily pass by making the density of the core wrap 32 higher than that of the absorption core 31. However, even if compression is provided only on the absorbent core 31 that does not include the core wrap 32, suppression of stuffiness can be obtained. Moreover, it is good also as the liquid absorption layer 3 which does not contain the core wrap 32 instead of the structure of the liquid absorption layer 3 of the napkin 1 of this embodiment.

  In the napkin 1, the groove 71 is provided with a structure (longitudinal hollow path and width hollow path) in contact with air inside the liquid absorption layer 3. More specifically, the bottom of the groove 71 can be in contact with air at a position close to the surface layer, and even when the amount of liquid at the beginning of excretion is small, water is actively evaporated (hereinafter referred to as internal moisture removal or simply moisture removal). It can also be said.) In addition, since the side wall of the groove 71 is formed in the thickness direction from the position close to the surface layer to the position of the leak-proof layer, it can be in wide contact with air, and when the amount of liquid retained is small, the skin contact surface of the side wall Internal evaporation can be performed from a position close to the side, and internal evaporation can be performed at the side wall as the liquid holding amount increases. Therefore, the longitudinal direction hollow passage and the width direction hollow passage enable internal evaporation of moisture regardless of the amount of excretion.

  In addition, in the napkin 1, as shown in FIG. 2 (B) and FIG. 4, an effective density difference is provided in the liquid absorption layer 3 by the squeezing unit 10 disposed in the small absorption unit 8, and the absorbed body fluid is absorbed. The body can be quickly guided to the non-skin contact surface side of the napkin 1 and the body fluid can be moved away from the side close to the skin, and the moisture release to the skin side is suppressed by the internal moisture release and internal circulation structure. It is possible to effectively reduce the humidity during the period. Regardless of the amount of excretory fluid, it is possible to give a high dry feeling to the wearer and hardly give a moist feeling, and it is possible to effectively reduce rough skin. In addition, if the internal circulation is more efficiently performed by the structure in which the groove 71 extends while intersecting the longitudinal direction and the width direction, it is effective for suppressing the stuffiness. Moreover, the density of the small absorption part 8 is higher than the density of the separation part 7. Thereby, when the body fluid enters from the skin contact surface side of the liquid absorbing layer 3, the body fluid easily moves and diffuses from the separating portion 7 to the small absorbing portion 8 side, so that the body fluid hardly accumulates on the surface and the wearer feels dry. It is easy to give.

  As the planar shape of the non-skin side surface of the squeezed portion 10, various shapes such as a circle, an ellipse, a square, a rectangle, and a triangle can be adopted. In this embodiment, circular pin embossing is adopted. The surface area of the squeezed portion, that is, the opening area on the non-skin contact side surface of the liquid absorbing layer 3 is the flat area of the non-skin side surface of the small absorbing portion 8 (non-opening when the squeezing portion 10 has no opening). 1% or more, particularly 3% or more, more preferably 10% or more, and preferably 70% or less, particularly 60% or less, more preferably 50% or less with respect to the skin side surface area). Specifically, it is preferably 1% or more and 70% or less, particularly 3% or more and 60% or less, and more preferably 10% or more and 50% or less. When it is at least the lower limit value, sufficient liquid conductivity is easily obtained, and suppression of stuffiness due to vapor discharge is 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.

  In the napkin 1, as described above, a plurality of pressing parts 10 (two pressing parts 10 in FIG. 2C) are provided in each small absorbing part 8, but one is provided for each small absorbing part 8. You may provide the pressing part 10 one by one. Moreover, in any case, although the pressing part 10 may be provided in the whole liquid absorption layer 3, what is necessary is just to provide in the excretion opposing part of the liquid absorption layer 3, or an excretion opposing part, and its vicinity. By doing so, the rigidity at the excretion facing portion of the liquid absorbing layer 3 is increased, the difference in rigidity from the groove becomes remarkable, the fit to the wearer's skin is increased, and a suitable wearing feeling is easily obtained. It is also effective in suppressing liquid leakage.

In the napkin 1, the skin side surface end portion of the compressed portion 10, that is, the bottom portion of the compressed portion 10 is located on the non-skin contact surface side with respect to the non-skin contact surface of the continuous layer 6. In other words, the bottom, which is the skin contact surface side end of the compressed portion 10, is positioned closer to the non-skin contact surface than the bottom, which is the skin contact surface side end of the groove 71. Therefore, as shown in FIG. 2B, in the small absorbent portion 8, the absorbent material is present from the bottom of the groove 71 to the non-skin contact surface side at any position. For this reason, the liquid absorption performance of the absorption core 31 can be effectively used in the thickness direction, and the flexibility of the liquid absorption layer 3 can be ensured. Therefore, when the body fluid absorbed from above the groove 71 is guided to the peripheral portion of the squeezed portion 10 having a relatively high density, the volume of the peripheral portion having the high density is large, so that the body fluid is efficiently retained. be able to. Further, at that time, when the liquid absorbing layer 3 is deformed with the groove 71 as a flexible shaft by the wearer's movement, the small absorbent portion 8 is flexible, so even if an excessive force is applied to the small absorbent portion 8, the absorbent core It can suppress that 31 is broken and the absorbed liquid is squeezed out.
The thickness direction length (depth) of the pressing part 10 is preferably 20% or more, more preferably 30% or more of the total thickness of the liquid absorption layer 3, and 80% or less, and further 75% or less. preferable. Within this numerical range, it is preferable from the viewpoint of flexibility of the absorbent core 31 and easy provision of a density gradient in which the liquid can easily migrate between the low density portion and the high density portion in the small absorbent portion 8.
Moreover, in the absorbent core 31, the position of the bottom part of the pressing part 10 is located in the non-skin contact surface side by the distance of 10% or more of the total thickness of the absorbent core 31 rather than the position of the bottom part of the groove | channel 71. It is preferable from a viewpoint of coexistence of the rapid spreading | diffusion of the bodily fluid to the surrounding area | region of the pressing part 8 with a high density, and subsequent liquid retention performance.

  In this invention, the width | variety, depth, etc. of the groove | channel 71 are not limited to the thing of this embodiment, It can change arbitrarily as a groove | channel which has an effect | action similar to the above. For example, a form as shown in FIG. 5 is also preferable. FIG. 5 is a plan view showing a modified example of the groove of the liquid absorbing layer 3 according to the present invention from the non-skin contact surface side of the absorbent body. As shown in FIG. 5, the groove width may be increased from the center of the liquid absorbing layer toward the longitudinal direction in the longitudinal direction. Thereby, it is possible to make the external discharge of the moist air more effective and further promote the reduction of the humidity, which is preferable.

  Furthermore, in this invention, the structure of the liquid 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 liquid absorption layer 3 may have a so-called medium-high structure in which the excretion part facing region is thicker than other regions.

  The constituent material of the absorbent core 31 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, single fibers made of synthetic resins such as polyvinyl alcohol resin, and these resins. A composite fiber containing two or more kinds, or a semi-synthetic fiber such as acetate or 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. Moreover, as a material of the core wrap sheet 32, a pulp sheet, a nonwoven fabric sheet, or the like can be used.

  As the surface layer 2, various nonwoven fabrics (for example, air-through nonwoven fabric, spunbond nonwoven fabric, etc.) are used alone, or a composite sheet in which a plurality 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 protrusions 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 in the surface layer, and the liquid on the surface layer 1 can be quickly transmitted to the liquid absorbing layer 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. As a preferred form, as shown in FIG. 3, the core-sheath type is provided on the skin contact surface side in order to make the liquid draw-in property higher, to make it difficult for the liquid residue to occur on the surface layer portion and to prevent the liquid from returning. Including a heat-fusible conjugate fiber, the heat-fusible conjugate fiber comprising a thermally stretchable fiber elongated by heat treatment, including a fiber layer containing a crimpable fiber on the non-skin contact surface side, A surface layer in which these are joined by a large number of joints seems to be preferable. Specifically, the surface layer 2 has a first layer on the skin contact surface side, a second layer adjacent to the first layer on the non-skin contact surface side, and the first layer and the second layer are Joined by a large number of joints, and a large number of convex portions are formed on the skin contact surface side of the first layer, surrounded by the multiple joints and projecting to the skin contact surface side of the first layer In the convex portion, the second layer is raised toward the skin contact surface side of the first layer and enters the first layer, and the non-skin contact surface of the second layer is formed in the convex portion. A layer having a flat side surface can be used.

The leak-proof layer 4 can be a moisture-permeable film alone, a film in which a nonwoven fabric is bonded, or a water-repellent nonwoven fabric (such as SMS or SMMS). 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 stretching and extruding a thermoplastic resin and an inorganic filler that is incompatible with the thermoplastic resin and extruding the film to a predetermined size, 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 according to the present invention and does not exude moisture, the moisture permeability ranges from 0.7 to 3.0 g / 100 (cm ² hr). It is preferable that it exists in the range of 1.0-2.5 g / 100 (cm < ² > hr). From the viewpoint of sufficiently enhancing the smoothness, it is most preferably in the range of 1.5 to 2.5 g / 100 (cm ² 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%.

  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 liquid absorption layer, the leak-proof layer, and the side sheet, members may be appropriately incorporated in accordance with the use and function. The material of the surface layer, liquid absorption layer and leak-proof layer of the sanitary napkin of the above embodiment, the conditions in the production method, the dimensions of the product, etc. are not particularly limited, and various types used in normal sanitary napkins etc. Materials can be used.

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 a liquid absorption layer between the surface layer and the leak-proof layer, The liquid absorption layer includes a continuous layer that includes a skin contact side surface and is continuous in the planar direction, and a plurality of small absorption portions that are continuously integrated with the liquid absorption layer and protrude toward the non-skin contact surface side, Each of the small absorbent parts is separated by a spaced part having a basis weight lower than that of the small absorbent part. The separated part does not penetrate the skin contact surface of the liquid absorbent layer, and the small absorbent part has no skin. An absorptive article provided with a squeezing part that is recessed from the contact surface side toward the skin contact surface side.

<2> The absorbent article according to <1>, wherein the small absorbent portion has a density higher than that of the separated portion.
<3> The absorbent article has a vertically long shape in a direction corresponding to the front-rear direction of the wearer, the separation portion includes a groove and a concave portion absorption portion, and the groove extends along the longitudinal direction of the article. The absorbent article according to <1> or <2>, further including a longitudinal groove that longitudinally cuts the liquid absorbing layer across the front and rear ends.
<4> The absorbent article according to <3>, wherein the longitudinal groove has a width of 0.2 mm to 5 mm.
<5> 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. The absorbent article according to <3> or <4>.

<6> The absorbent article according to <5>, wherein the widthwise groove has a width of 0.25 mm to 5 mm.
<7> Any one of <1> to <6>, wherein the skin contact surface side end portion of the pressing portion is positioned closer to the non-skin contact surface side than the skin contact surface side end portion of the groove. The absorbent article as described.
<8> The absorbent article according to any one of <1> to <7>, wherein a depth of the compressed portion is 20% to 80% of a thickness of the liquid absorption layer.
<9> The absorbent article according to any one of <1> to <8>, wherein the leak-proof layer is a moisture-permeable film.
<10> The absorbent according to any one of <1> to <9>, wherein the liquid absorption layer includes an absorption core, and the depth of the groove is 20 to 80% of the thickness of the absorption core. Goods.
<11> The absorbent article according to any one of <1> to <10>, wherein a plurality of the compressed parts are arranged in each of the small absorbent parts.

<12> The absorbent article according to any one of the said plane area of the small absorption portion is 0.25 cm ² or more 25 cm ² or less <1> to <11>.
<13> The pressing part according to any one of <1> to <12>, wherein the pressing part 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 part. Absorbent article.
<14> The surface layer has a first layer on the skin contact surface side, a second layer adjacent thereto on the non-skin contact surface side, and the first layer and the second layer are Joined by a large number of joints, and a large number of convex portions are formed on the skin contact surface side of the first layer, surrounded by the multiple joints and projecting to the skin contact surface side of the first layer In the convex portion, the second layer rises toward the skin contact surface side of the first layer and enters the first layer. In the convex portion, the second layer The absorbent article according to any one of <1> to <13>, wherein the surface on the non-skin contact surface side is flat.
<15> The liquid absorption layer is formed by covering the skin contact surface side and the non-skin contact surface side of the absorption core with a core wrap, and the pressing portion includes the core wrap on the non-skin contact surface side. The absorbent article according to any one of <1> to <14>.
<16> The absorbent article according to any one of <1> to <15>, wherein the liquid-absorbing layer has a middle-high structure in which the excretory part facing region is thicker than other regions.

The absorbent article as described in any one of said <1>-<14> in which the <17> above-mentioned pressing part is provided in the excretion part opposing part which opposes a wearer's excretion part.
The absorbent article as described in any one of said <1>-<15> in which the <18> said pressing part is provided in all the small absorption parts.
<19> The absorbent article according to any one of <1> to <18>, wherein the planar shape of the non-skin side surface of the compressed portion is a circle, an ellipse, a square, or a triangle.
<20> The absorbent article according to any one of <1> to <19>, wherein the absorbent article is a sanitary product or an incontinence pad.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

[Example 1]
A sanitary napkin having the structure shown in FIG. 1 was produced according to a conventional method, and this was used as a sample of Example 1. As the surface layer and the side sheet, a polyethylene air-through nonwoven fabric having a basis weight of 25 g / m ² was used, and the surface layer was hydrophilized to be liquid permeable. A non-breathable polyethylene film having a basis weight of 30 g / m ² was used as a leak-proof layer.
The liquid absorption layer is produced according to the example of JP 2012-125270 A, and is pressed with a diameter of 3 mm and a depth of 0.7 mm from the non-skin contact surface side of the small absorption part (block part) toward the skin contact surface. Part (pin embossing) was provided. Regarding the dimensions of the liquid absorption layer, the length of the liquid absorption layer was 275 mm, the width of the liquid absorption layer was 80 mm, and the thickness of the liquid absorption layer was 2 mm. The groove width of the liquid absorption layer was 2 mm, and the depth was 1 mm.
Moreover, the density of the small absorption part of the liquid absorption layer was 0.10 g / cm ³ . The density of the recessed portion absorbing portion of the liquid absorbing layer was 0.05 g / cm ³ . The basis weight of the pulp in the small absorption part of the liquid absorption layer is 160 g / m ² , the basis weight of the water absorbing polymer is 50 g / m ² , and the basis weight of the pulp in the recessed part absorption part of the liquid absorption layer is 80 g / m ² . The basis weight of the polymer was 25 g / m ² .

[Example 2]
A sanitary napkin was produced in the same manner as in Example 1 except that the uneven sheet described in Example 1 of JP2012-5701 was used as the surface material.

[Comparative Example 1]
As a liquid absorption layer, the liquid absorption layer which does not provide a pressing part in a small absorption part was produced with the same dimension as Example 1.
The basis weight of the pulp of the liquid absorbing layer was 160 g / m ² , and the basis weight of the water absorbing polymer was 50 g / m ² .

[Comparative Example 2]
As the absorber, an absorber without a groove was produced with the same dimensions as in Example 1. A sanitary napkin was produced in the same manner as in Example 1 using this laminate and the absorbent. This was used as a sample for comparison.
The basis weight of the absorbent pulp was 160 g / m ² , and the basis weight of the water-absorbing polymer was 50 g / m ² .

[Performance evaluation]
<Surface liquid remaining amount>
A method for measuring the surface liquid return amount will be described below. The surface layer liquid return amount indicates how much the liquid absorbed in the liquid absorption layer returns to the surface layer side by pressurization. The smaller the amount, the higher the liquid retention of the liquid absorption layer, and it is easier to obtain a dry feeling and low stuffiness when worn.
First, a sanitary napkin was placed horizontally. On this sanitary napkin, a cylindrical acrylic plate with an inlet having a diameter of 1 cm is overlapped on the bottom, and the viscosity from the inlet to the excretory part facing region of the sample (position 40 mm from the front end in the longitudinal direction of the sample) is 8. 3 g of defibrinated horse blood adjusted to 0 ± 0.1 cP was injected. After injection, the state was held for 1 minute. Next, the acrylic plate with a cylinder is removed, and an absorbent paper (commercially available tissue paper) having a weight of 6 g × 9.5 cm and a basis weight of 13 g / m ² is previously measured on the surface of the top sheet. It was. Further, a weight was placed thereon so that the pressure was 4.5 × 10 ² Pa, and pressure was applied for 5 seconds. After pressurization, the absorbent paper was taken out, the change in mass of the absorbent paper before and after pressurization was measured, and the mass of defibrinated horse blood absorbed by the absorbent paper was taken as the remaining surface layer liquid.
Next, the above acrylic plate was overlaid again on the sample after the test, and 3 g of defibrinated horse blood was again injected through the injection port 3 minutes after the first injection. The position of horse blood injection into the sanitary napkin was the same as the position where the first 3 g was injected. Then, after maintaining the state for 1 minute after the injection, the acrylic plate was removed, and the remaining amount of the surface layer liquid was measured in the same manner as the previous time. Further, 3 minutes after the second injection, 3 g of defibrinated horse blood was added to the sample after the measurement in the same manner as described above, and the remaining amount of the surface liquid was measured in the same manner as the previous time. Was measured. Moreover, at the time of each liquid injection | pouring, time (liquid absorption time) after inject | pouring a liquid until it absorbs all the liquids was measured.

  As is apparent from the results shown in Table 1, it was found that the sanitary napkin of Example 1 had a small amount of remaining surface layer liquid and was excellent in liquid drawability. In Example 2 in which the surface sheet was specified, the remaining amount of the surface layer liquid was further reduced. As described above, the sanitary napkin of each example has excellent liquid retention and can effectively reduce the humidity on the skin side of the wearer, so that the wearer has an excellent dry feeling regardless of the amount of liquid. It is possible to provide a more comfortable wearing feeling.

1 Sanitary napkin (absorbent article)
2 Surface layer 3 Liquid absorption layer 31 Absorption core 32 Core wrap sheet 4 Leak-proof layer 5 Side sheet 6 Continuous layer 7 Separation part 71 Groove 71a Longitudinal groove 71b Width direction groove 72 Recessed part absorbent part 8 Small absorbent part 81 Protruding absorbent part 10 Press part 11 gap

Claims (4)

A liquid-permeable surface layer on the skin contact surface, a leak-proof layer on the non-skin contact surface side, and an absorbent article having a liquid absorption layer between the surface layer and the leak-proof layer,
The liquid absorption layer includes a continuous layer that includes the skin contact side surface and continues in the plane direction, and a plurality of small absorption portions that continuously and integrally protrude with the non-skin contact surface side.
Each of the small absorption parts is separated by a separation part having a lower basis weight than the small absorption part,
The small absorption part has a higher density than the separation part,
The spacing portion does not penetrate the skin contact surface of the liquid absorbing layer,
The small absorbing portion is provided with a squeezed portion that is recessed from the non-skin contact surface side toward the skin contact surface side ,
The skin contact surface side edge part of the said pressing part is an absorptive article located in the non-skin contact surface side rather than the non-skin contact surface of the said continuous layer . The absorbent article has a vertically long shape, and the separation portion includes a groove and a recessed portion absorbing portion, and includes a longitudinal groove extending longitudinally through the absorbent layer along the longitudinal direction of the article as the groove. The absorbent article according to claim 1 . The groove includes a width direction groove extending across the absorption layer along a width direction that is a direction orthogonal to the length direction, and the width direction groove intersects the length direction groove. Item 3. An absorbent article according to item 1 or 2 . The surface layer has a first layer on the skin contact surface side, a second layer adjacent to the first layer on the non-skin contact surface side, and the first layer and the second layer are joined together in a large number. A large number of convex portions are formed on the skin contact surface side of the first layer, surrounded by a large number of the joint portions and projecting to the skin contact surface side of the first layer. In the convex portion, the second layer protrudes toward the skin contact surface side of the first layer and enters the first layer. In the convex portion, the non-skin contact of the second layer The absorbent article according to any one of claims 1 to 3 , wherein the surface on the contact surface side is flat.

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