JP2011255023A5 - - Google Patents

Description

Absorbent articles

  The present invention relates to absorbent articles such as sanitary napkins and panty liners.

  As a sanitary napkin having an excellent function in which menstrual leakage does not occur, Patent Document 1 describes a napkin in which a compression groove is provided in a mesh pattern on the upper surface of an absorption part. Certainly, the sanitary napkin described in Patent Document 1 is provided with a compression groove in a mesh pattern, so that menstrual blood hardly spreads on the surface and menstrual leakage does not easily occur. Since the so-called second sheet is not arranged on the sanitary napkin, it is difficult to instantaneously absorb menstrual blood from the surface of the sanitary napkin.

  For example, Patent Document 2 discloses a relatively thin sanitary napkin in which a liquid-permeable wiping acquisition sheet, which is a spunlace nonwoven fabric sheet made of rayon and polyester fibers, is disposed between a top sheet and an absorbent core. Is described. Further, for example, in Patent Document 3, an absorption composed of a body-capturing distribution layer on the upper sheet side and a liquid storage layer on the rear sheet side between the liquid-permeable upper sheet and the liquid-impermeable rear sheet. An absorbent article having a body core disposed therein is described, wherein the body-capturing distribution layer is described as a web made of hydrophilic cellulose fibers obtained by stiffening wood pulp fibers with an interfiber chemical stiffener. Yes.

  Certainly, the sanitary napkin of Patent Document 2 is provided with a liquid permeable wiping acquisition sheet, which is a so-called second sheet, so that the body fluid can be dispersed in the lateral direction, and from the top sheet of the sanitary napkin instantly. Can absorb menstrual blood. However, since the liquid-permeable wiping acquisition sheet | seat which the sanitary napkin of patent document 2 contains the rayon which is a semi-synthetic fiber, it is easy to produce the liquid residue of a bodily fluid, and an absorbent material from a liquid-permeable wiping acquisition sheet | seat Since it is difficult to transfer body fluid to the core, it takes time to completely transfer the body fluid to the absorbent core.

  In addition, the absorbent article of Patent Document 3 is certainly provided with a body-capturing distribution layer that is a so-called second sheet, so that body fluid can be quickly collected and temporarily retained, and the absorbent article Body fluid can be instantaneously absorbed from the upper sheet. However, since the body-capturing / distributing layer of the absorbent article of Patent Document 3 is a web made of hydrophilic cellulose fibers, it retains the body fluid and, like the sanitary napkin of Patent Document 2, The rest tends to occur, and it takes time to transfer the body fluid from the body-capturing distribution layer to the liquid storage layer.

JP-A-56-109660 Japanese Patent Laid-Open No. 2-11137 JP-A-5-503445

  Accordingly, an object of the present invention is to provide an absorbent article in which bodily fluids are difficult to spread on the surface, the remaining amount of bodily fluids other than the absorber is reduced, and the transition time of bodily fluids to the absorber can be shortened. It is in.

The present invention provides a surface sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, an absorber disposed between these sheets, and the absorber and the surface sheet. An absorbent article having a second sheet disposed therebetween, wherein the top sheet and the second sheet are partially fixed, and the top sheet is divided into a plurality of sections by linear embossing. In the pore size distribution measurement with a pore size of 1 to 600 μm by a mercury porosimeter, the pore volume of the region with a pore size of 100 μm or less is 10% or less of the total pore volume, and the second sheet is The constituent fiber is a synthetic fiber, the thickness is 0.15-0.4 mm, and the liquid retention amount provides the absorbent article which is a sheet | seat of 60 g / m < ² > or less.

  According to the absorbent article of the present invention, it is difficult for the body fluid to spread on the surface, the remaining amount of the body fluid other than the absorber can be reduced, and the transition time of the body fluid to the absorber can be shortened.

FIG. 1 is a plan view of a sanitary napkin according to an embodiment of the absorbent article of the present invention as viewed from the top sheet side. FIG. 2 is a perspective view showing an embodiment of the top sheet of the sanitary napkin shown in FIG. FIG. 3 is an enlarged plan view showing a part on the skin contact surface side of the top sheet shown in FIG. 4 is a cross-sectional view taken along line XX of FIG. FIG. 5 is an enlarged cross-sectional view of a main part in which the main part in FIG.

The present invention will be described below based on preferred embodiments with reference to the drawings.
The absorbent article of one embodiment of the present invention is a sanitary napkin 1 and, as shown in FIGS. 1 and 4, a surface sheet 2 disposed on the skin contact surface side and a non-skin contact surface side. And the second sheet 5 disposed between the absorber 4 and the top sheet 2. The second sheet 5 is disposed between the top sheet 2 and the back sheet 3.
In addition, in this specification, the "skin contact surface side" is the surface side disposed on the skin side of the wearer when worn, among the front and back sides of the constituent members of the sanitary napkin 1, The “non-skin contact surface side” is a surface side arranged on the opposite side to the wearer's skin side when worn. The “Y direction” shown in the figure is a direction along the longitudinal direction of the sanitary napkin 1, and the “X direction” is a direction perpendicular to the Y direction and is a direction along the width direction of the sanitary napkin 1. It is.

  As shown in FIGS. 1 and 4, the present embodiment includes a rectangular absorbent body 4 that is long in the same direction as the front-rear direction at the time of mounting, and a second seat 5 that is substantially the same shape and size as the absorbent body 4. ing. A second sheet 5 is disposed on the skin contact surface side of the absorbent body 4. As shown in FIGS. 1 and 4, the top sheet 2 covers the entire area on the skin contact surface side of the rectangular second sheet 5, and the longitudinal direction (Y direction) of the absorber 4 and the second sheet 5. It has the part extended outward from both ends and both sides. As shown in FIGS. 1 and 4, the back sheet 3 covers the entire area on the non-skin contact surface side of the absorbent body 4, both ends in the longitudinal direction (Y direction) of the absorbent body 4 and the second sheet 5, and It has a portion extending outward from both sides. As shown in FIG. 1, the top sheet 2 and the back sheet 3 are fused (heat-embossed, super-exposed) at portions extending outward from both ends in the longitudinal direction (Y direction) of the absorber 4 and the second sheet 5. As shown in FIG. 4, the portions that extend outward from both sides in the longitudinal direction (Y direction) of the absorber 4 and the second sheet 5 are fixed with an adhesive. Thus, the absorber 4 and the second sheet 5 are sandwiched between the top sheet 2 and the back sheet 3.

  As shown in FIG. 4, the top sheet 2 of the sanitary napkin 1 has a large number of partitioned regions 22 partitioned by linear embosses 21. Since the topsheet 2 has the partition region 22 in this way, the wearer's bodily fluid absorbed in one partition region 22 diffuses to another partition region 22 adjacent beyond the partition region 22. hard. Here, “linear embossing” means that the embossed shape is not limited to a straight line in a plan view but includes a curved line, and the embossed shape is a continuous line and includes an intermittent line such as a broken line. There is nothing. However, even if it is an intermittent line, if it is an interval of less than 1 mm, it is included because it has substantially the same effect as a continuous line. The partitioned area 22 may have a rectangular or curved shape other than the rhombus lattice pattern. A lattice pattern is particularly preferred.

As shown in FIG. 3 , the surface sheet 2 of the present embodiment has a plurality of first linear embosses 21 a formed in parallel with each other at predetermined intervals as linear embosses 21, and in parallel with each other. A plurality of second linear embosses 21b formed at a predetermined interval, and the first linear emboss 21a and the second linear emboss 21b intersect each other at an angle α. Yes. The groove width W1 of the first linear emboss 21a and the groove width of the second linear emboss 21b are the same, and the interval W2 between the adjacent first linear embosses 21a and the adjacent second linear emboss 21b. The interval between them is the same.

As shown in FIG. 3, the groove width W1 of the first linear emboss 21a is 0.1 to 1.5 mm, particularly 0.3 to 0.00 mm from the viewpoint of securely fixing the constituent fibers in the linear emboss. It is preferably 9 mm. Moreover, it is preferable that the space | interval W2 of the 1st linear embossing 21a is 2-14 mm, especially 2-8 mm from a viewpoint of coexistence of liquid permeation | transmission and liquid suction. Groove width W1 and the distance W2 is measured in a direction Cartesian to the line. The width of the line may change from the intersection, but W1 is measured at the intersection and the midpoint of the intersection. W2 is measured by a line connecting opposite sides of the partition region 22.

Topsheet 2 of the present embodiment, by forming the linear emboss 21 by applying heat embossing from being that skin contact surface side toward the skin side of a wearer when incorporated into the sanitary napkin 1 The portion where the linear emboss 21 is formed is a recess. In the part of the linear embossing 21, constituent fibers to be described later are heat-sealed in the thickness direction.
Since the linear emboss 21 is formed in a lattice pattern by the first linear emboss 21a and the second linear emboss 21b, the surface sheet 2 is partitioned by the linear emboss 21. Regions 22, 22... Are formed. Each partition region 22 is a region surrounded by a linear emboss 21 around each periphery, and has a rhombus shape in plan view. The central portion of each partition region 22 is raised relative to the linear emboss 21 (concave portion) surrounding the partition region 22 to form a convex portion.

  As the surface sheet 2 of the present invention, a sheet having high permeability is used. It has been found that the voids caused by the fiber distribution in the sheet, particularly when the pore region is small, shows good liquid permeability. Specifically, in the pore size distribution measurement of pore sizes 1 to 600 μm with a mercury porosimeter, It is preferable that the pore volume in a region having a pore diameter of 100 μm or less is a sheet having 10% or less of the total pore volume, and that the pore volume is 8% or less of the total pore volume, preferably 6% or less. More preferably, the sheet is Thus, the lower limit of the pore capacity in the region having a pore diameter of 100 μm or less is not particularly limited, and the smaller the better.

  The pore size distribution of the surface sheet 2 is measured using a mercury porosimeter (Shimadzu Corporation) in accordance with a mercury intrusion method (JIS R 1655). The mercury intrusion method is a method for obtaining information on the physical shape of the topsheet 2 by measuring the size (pores) between the constituent fibers of the topsheet 2 and the volume thereof. The principle of the mercury intrusion method is to apply a pressure to mercury to inject it into the pores of the object to be measured, and to measure the relationship between the pressure applied at that time and the volume of mercury that has been pushed in (intruded). Hereinafter, a method for measuring the pore size distribution of the top sheet 2 using a mercury porosimeter will be described.

[Measurement method of pore size distribution of surface sheet]
First, the surface sheet 2 is taken out from the sanitary napkin 1 (absorbent article). Next, the taken surface sheet 2 is cut into 24 mm × 15 mm. A total of three sheets are cut, and these cut samples are set in a sample cell of a mercury porosimeter (Shimadzu Corporation) so as not to overlap each other, and a pore size distribution with a pore size of 1 to 600 μm is measured. Based on the pore distribution curve (differential / integral curve) of the surface sheet 2 to be obtained, the total pore volume over the pore diameter of 1 to 600 μm is defined as the total pore volume, and the pore volume in the region of the pore diameter of 100 μm or less. The ratio to the total pore volume is determined. Furthermore, based on the pore distribution curve (differential / integral curve) of the surface sheet 2 to be obtained, the ratio of the pore volume in the region having a pore diameter of 1 to 100 μm to the total pore volume is determined.

  As described above, as the surface sheet 2 in which the pore volume in a region having a pore diameter of 100 μm or less is 10% or less of the total pore volume in the pore diameter distribution measurement with a pore diameter of 1 to 600 μm using a mercury porosimeter, Air-through nonwoven fabric composed only of non-heat-stretched fibers of 4 dtex or more, Air-through nonwoven fabric composed of heat-stretched fibers of 3.3 dtex or more, Air composed of non-heat-stretched fibers and heat-stretched fibers of 3.3 dtex or more A through nonwoven fabric is mentioned, and an air through nonwoven fabric composed of non-heat-stretched fibers and heat-stretched fibers of 3.3 dtex or more is preferable from the viewpoint of achieving both absorbency and texture. Since such a nonwoven fabric is further partitioned by linear embossing, even if the liquid tries to diffuse in the nonwoven fabric as a surface sheet, the diffusion is suppressed at the linear embossing, so the liquid to the lower layer is further reduced. Permeability is easily exhibited.

When the surface sheet 2 is air-through nonwoven nonwoven fabric containing heat elongation fibers, the topsheet 2, specifically, in the divided region 22 extends the length of the heat Shin long fibers by heating, divided areas 22 the inner, indicating that the mutual intersections of the heat extension length fibers crossed are joined by heat fusion nonwoven. As described above, the heat-extending fiber is a heat-fusible fiber that is bonded by heat fusion, and the heat fusion is, for example, air-through heat fusion. The heat-fusible fiber as the heat-stretching fiber is preferably a heat-stretchable composite fiber comprising a heat-fusible component and a high-melting component having a higher melting point than the heat-fusible component. More preferably, it is a core-sheath type heat-extensible composite fiber having a melting point component as a core. The heat fusion component and the high melting point component are preferably thermoplastic resins. Examples of the heat fusion component include polyethylene, polypropylene, polybutene-1, polypentene-1, or a random or block copolymer thereof. The high melting point component, e.g., polyethylene terephthalate tallate, polyesters such as polybutylene terephthalate, polyamides such as nylon-6 or nylon-66 and the like. Preferred combinations of the heat fusion component and the high melting point component include polyethylene and polyethylene terephthalate, polyethylene and polypropylene, low melting point polyethylene terephthalate and polyethylene terephthalate, polyethylene and polybutylene terephthalate, etc., but are not limited thereto. Absent. The core-sheath type composite fiber may be a concentric type, an eccentric type, or a fiber having a core component exposed at a part of the entire circumference of the fiber.

  The heat-extensible composite fiber is a fiber whose length is extended by heating, and is a fiber that extends at a temperature of 90 ° C. or higher, preferably 110 ° C. to 130 ° C. The heat-extensible conjugate fiber can be formed at the time of manufacturing the topsheet 2 to form irregularities with large undulations on the topsheet 2. Therefore, after the surface sheet 2 is completed, many of them are in an extended state, and do not mean fibers that are further extended from the state. Moreover, the heat-extensible composite fiber after extension is also included in the heat-extensible composite fiber.

  Examples of the heat-extensible conjugate fiber include a fiber that changes in the crystalline state of the resin by heating, or a fiber that has been crimped and has an apparent length that is released by crimping. Etc. As the heat-extensible composite fiber, the stretch ratio at a temperature 10 ° C. higher than the softening point of the heat-fusible component and 10 ° C. lower than the melting point is 5 to 40%, particularly 10 to 30%. It is preferable from the point that a part and uneven | corrugated shape are formed notably. Preferable examples of the heat-extensible conjugate fiber are described in paragraphs [0024] to [0040] of JP-A-2005-350836.

In the case where the topsheet 2 is an air-through non-woven fabric containing a heat-stretchable fiber (heat-stretchable conjugate fiber), the ratio of the heat-stretchable conjugate fiber is that of the topsheet 2 from the viewpoint of exhibiting texture, concealment and high permeability. In the constituent fibers, the content is preferably 40 to 100% by mass, more preferably 70 to 100% by mass, and particularly preferably 95 to 100% by mass. Examples of the fiber to be blended in addition to the heat-extensible composite fiber include a fiber (non-composite fiber) made of a thermoplastic resin.
In the case where the topsheet ² is an air-through nonwoven fabric containing heat-extensible fibers (heat-extensible composite fibers), the basis weight is preferably ²⁰ to 50 g / m ² .

When the topsheet 2 is an air-through nonwoven fabric composed only of heat-bonded fibers (non-thermally stretched fibers) of 4.4 dtex or more (preferably 4.4 to 10 dtex), it is a synthetic fiber such as polyethylene, Fibers made of resins such as polyesters such as polypropylene, polyethylene terephthalate and polybutylene terephthalate, and polyamides such as nylon-6 and nylon-66 can be formed alone or in admixture of two or more. Moreover, it is preferable that the basic weight is 20-50 g / m < ² >.

  The constituent sheet of the second sheet 5 of the sanitary napkin 1 is a synthetic fiber. Thus, since the 2nd sheet | seat 5 is comprised with the synthetic fiber, a diffusivity can be restrained low. Further, the synthetic fiber constituting the second sheet 5 is preferably a weakly hydrophilic fiber from the viewpoint of mechanical compatibility while keeping the diffusibility low. As the synthetic fiber constituting the second sheet 5, fibers made of a resin such as polyethylene, polypropylene, polyethylene terephthalate, polyester such as polybutylene terephthalate, polyamide such as nylon-6 or nylon-66, etc., alone or in two types The above can be mixed and formed. In addition, mixing mentioned here includes using 2 or more types of resin from which melting | fusing point differs as a core-sheath-type composite fiber and a side-by-side type composite fiber.

  Since the second sheet 5 is a sheet having high permeability and moderate diffusivity, its thickness is 0.15 to 0.4 mm. From the viewpoint of suppressing the holding capacity of body fluids and exhibiting high permeability. 0.15 to 0.4 mm, and more preferably 0.2 to 0.3 mm. The thickness is measured under a 0.5 kPa load from the viewpoint of considering the wearing state.

Further, since the second sheet 5 is a sheet having high permeability and moderate diffusivity, the liquid holding amount is a sheet having a liquid holding amount of 60 g / m ² or less, but 35 g / m from the viewpoint of exhibiting high permeability. preferably ² or less of the sheet, more preferably a sheet of ^{25g / m 2 ~5g / m 2} . Thus, it is preferable that the lower limit of the liquid holding amount of the second sheet 5 is as low as possible. The liquid holding amount of the second sheet 5 is measured by the following measuring method.

[Measurement method of liquid holding amount]
The second sheet 5 is taken out from the sanitary napkin 1 (absorbent article). Next, the taken out second sheet 5 is cut into a 5 cm × 5 cm square. The initial cut sample is weighed, and the cut sample is placed in a beaker containing 500 mL of distilled water and left for 1 minute. Thereafter, the cut sample is taken out, and the cut sample is left to stand for 10 minutes in a state of being hung on a basket. Thereafter, the cut sample is subjected to centrifugal dehydration (800 rpm) for 10 minutes, and then its mass is measured, and the liquid holding amount is obtained from the following formula.
Liquid retention amount (g / m ² ) = {mass of cut sample after centrifugal dehydration (g) −mass of initial cut sample (g)} / area of initial cut sample (m ² )

As the second sheet 5 satisfying the requirement that the thickness is 0.15 to 0.4 μm and the liquid holding amount is 60 g / m ² or less, the intersecting points of the crossed synthetic fibers are joined by air-through heat fusion. An air-through nonwoven fabric that has been used can be preferably used. In addition to the air-through nonwoven fabric, a point bond nonwoven fabric, a spunbond nonwoven fabric, a spunlace nonwoven fabric, or the like may be used as long as the thickness requirement and the liquid holding amount requirement are satisfied.
When the second sheet 5 is an air-through nonwoven fabric, the basis weight is preferably 15 to 40 g / m ² .

  The top sheet 2 and the second sheet 5 of the sanitary napkin 1 are partially fixed. By this, the float of a surface sheet is suppressed, the adhesiveness of the surface sheet 2 and the second sheet 5 improves, and a liquid becomes easy to transfer. For the same reason, it is preferable that the second sheet 5 and the absorber 4 are also partially fixed as will be described later. Partially fixed means that there are fixed portions consisting of dots and lines, and the fixed portions are distributed over the entire sheet surface and do not need to be evenly distributed. Means no. The area of the fixed part is preferably about 10 to 60% of the total area of the fixed sheet. Specifically, the topsheet 2 and the second sheet 5 are partially fixed by applying an adhesive intermittently or intermittently heat-sealing. When the adhesive is applied intermittently, the adhesive is applied intermittently using a known means such as a slot coat gun, spirally applied using a spiral spray gun, or spray gun. In the state which maintained the permeability | transmittance of the bodily fluid between the surface sheet 2 and the second sheet | seat 5 by apply | coating to a mist intermittently using a dot gun, or apply | coating to a dot shape using a dot gun. 2 and the second sheet 5 are partially bonded. As the adhesive to be applied, for example, a hot melt adhesive is preferably used.

Examples of the hot melt adhesive include styrene and olefin. Styrene-based hot melt adhesives include styrene-butadiene-styrene copolymer (SBS), styrene-isoprene-styrene copolymer (SIS), and styrene-ethylene-butylene-styrene copolymer, which is a hydrogenated product of SBS. (SEBS) and blended hot melt adhesives in which two or more of these are blended can be used. Among these, from the viewpoint of easily balancing the tack force and the cohesive force, a blended hot melt adhesive of SIS and SBS or a blended hot melt adhesive of SIS and SEBS is particularly preferably used in the present invention. The application amount of the hot melt adhesive is preferably ³ to 10 g / m ² .

  When intermittently heat-sealing, for example, using a hot embossing roll having a plurality of convex portions and a flat roll, a laminated sheet of the top sheet 2 and the second sheet 5 is formed with a hot embossing roll and a flat roll. The top sheet 2 and the second sheet 5 are partially fused by being conveyed and embossed. The interval between the plurality of fusion points formed by fusing is 5 to 5 from the viewpoint of maintaining appropriate permeability between the top sheet 2 and the second sheet 5 and maintaining appropriate body fluid permeability. It is preferably 15 mm.

The absorbent article of the present embodiment is a sanitary napkin 1 and the product itself is required to be thin. Therefore, the absorbent body 4 is formed from a multi-tubular absorbent sheet 40. Specifically, the absorbent sheet 40 is an absorbent sheet having a multi-surface shape and a superabsorbent polymer. As the absorbent sheet 40, for example, an absorbent sheet manufactured by a method described in JP-A-8-246395, pulverized pulp supplied in an air stream and a water-absorbing polymer are deposited, and then an adhesive (for example, vinyl acetate) is deposited. system adhesives, superabsorbent polymer absorbent sheet obtained by spraying, spunbond or melt blown down nonwoven production after applying the hot-melt adhesive or the like between the dry sheet, paper or non-woven fabric solidified with PVA, etc.) An absorbent sheet obtained by blending a superabsorbent polymer during the process can be used. These absorbent sheets can be cut into a predetermined shape and used as an absorbent sheet. Also, a plurality of absorbent sheets are bonded together to form a multilayer sheet, or a single absorbent sheet is folded and the layers are bonded to form a multilayer sheet, and the multilayer sheet thus obtained is used as the absorbent sheet. You can also. In the sanitary napkin 1 of the present embodiment, an absorption core that is usually used for absorbent articles such as sanitary napkins and that is made of absorbent polymer particles and a fiber material is covered with tissue paper. The body can also be used.

  The absorbent sheet 40 of the sanitary napkin 1 of the present embodiment uses a known thin and highly absorbent sheet described in JP-A-8-246395 from the viewpoint of increasing absorbability and reducing thickness. I can do it. Preferably, when the obtained absorbent sheet is wet or dried, it is wetted again, and the wet absorbent sheet is pressed onto the roll surface of a heated cylindrical so-called Yankee dryer, and dried. Then, a crepe treatment is performed to peel off the dried absorbent sheet from the Yankee dryer through a blade. By performing the crepe treatment in this way, a large number of wrinkles that can be visually observed are formed on the surface of the absorbent sheet, and the surface of the absorbent sheet 40 becomes multi-fed. The distance between the ridges is preferably 0.2 mm to 2 mm. By laminating the surface (skin contact surface 40 a) of the wrinkled absorbent sheet 40 and the second sheet 5, the body fluid that has quickly passed through the top sheet 2 is diffused in the second sheet 5, while the liquid is applied to the absorbent sheet 40. Transition. It is thought that diffusion of body fluid in the second sheet 5 may be promoted more than the case where the absorbent sheet 40 and the second sheet 5 have a slight space due to wrinkles, as compared with the case where they are in close contact with each other. As a result, it is considered that the body fluid diffused in the second sheet 5 can be absorbed by a relatively large area of the absorbent sheet 40. In addition, although the absorption sheet 40 of this embodiment is formed by performing the creping process, it may be dried by a method other than the creping process.

  The sanitary napkin 1 of the present embodiment is a sectional area of the top sheet 2 in a cross-sectional view of the sanitary napkin 1 from the viewpoint of facilitating the absorption of the body fluid that has passed through the top sheet 2 and the second sheet 5. The average spacing in the width direction of 22 is preferably 20 to 180 times, more preferably 25 to 160 times the inter-fiber distance of the constituent fibers on the skin contact surface 40a of the absorbent sheet 40.

  Specifically, the cross-sectional view of the sanitary napkin 1 shown in FIG. 4 shows a cross-sectional view taken along line X1-X1 shown in FIG. 1, and the cross-sectional view of the sanitary napkin 1 shown in FIG. A cross-sectional view is shown. Here, the X1-X1 line is a straight line extending in the X direction passing through the center of the sanitary napkin 1. The average distance in the width direction of the partition region 22 of the surface sheet 2 is determined by observing the cross section of the surface sheet 2 using a scanning electron microscope (SEM), and the first linear emboss 21a forming the partition region 22 Between the second linear emboss 21b, more specifically, between the X-direction center point in the groove of the first linear emboss 21a and the X-direction center point in the groove of the second linear emboss 21b. It is obtained by measuring. The number of measurement points is 10, and the average value is defined as the average interval in the width direction (X direction) of the partition region 22. Moreover, the interfiber distance between the constituent fibers on the skin contact surface 40a of the absorbent sheet 40 is measured by observing the skin contact surface 40a using a scanning electron microscope (SEM). The number of measurement locations is 10, and the average value is the inter-fiber distance of the constituent fibers on the skin contact surface 40a.

  As shown in FIGS. 1 and 2, the sanitary napkin 1 of the present embodiment has a leak-proof groove 6 formed by integrally compressing the top sheet 2, the second sheet 5 and the absorbent body 4. Are provided on both surfaces 1b and 1b in the longitudinal direction (Y direction) of the sanitary napkin 1. In the present embodiment, as shown in FIG. 1, the both sides of the topsheet 2 in the excretory part region A in contact with the body fluid excretion part of the wearer are convex outward in the X direction in plan view. A pair of leak-proof grooves 6A, 6A that are curved are formed, and each of the front region B extending in front of the excretory region A and the rear region C extending in the rear of the excretory region A is viewed in plan view. A pair of leak-proof grooves 6B, 6B and a pair of leak-proof grooves 6C, 6C that are convexly curved outward in the X direction are formed. As shown in FIG. 1, the leak-proof groove 6 of the present embodiment is formed by connecting the leak-proof groove 6 </ b> A, the leak-proof groove 6 </ b> B, and the leak-proof groove 6 </ b> C to form an annular circumferential groove.

  As described above, the sanitary napkin 1 has the top sheet 2 and the second sheet 5 partially fixed, and in the present embodiment, as shown in FIG. These are partially fixed by the leak-proof groove 6. That is, the second sheet 5 and the absorber 4 are not fixed except for the leak-proof groove 6. Specifically, the top sheet 2 and the second sheet 5 are partially fixed by intermittently applying an adhesive or intermittently heat-sealing. The surface sheet 2 and the second sheet 5 are intermittently fixed at the position of the linear emboss 21 (concave portion) forming the region 22. Moreover, since the crepe process is performed on the skin contact surface 40a of the absorber 4 as mentioned above, the uneven | corrugated shape is formed in multiple hooks. Therefore, the second sheet 5 and the absorbent body 4 are formed in an uneven shape on the skin contact surface 40a of the absorbent sheet 40 formed by creping as shown in FIG. A space is formed between the second sheet 5 and the second sheet 5.

A material for forming the sanitary napkin 1 of the present embodiment will be described.
As the top sheet 2 and the back sheet 3, any sheet can be used without particular limitation as long as it is normally used for absorbent articles such as sanitary napkins and panty liners. For example, the top sheet 2 can be a hydrophilic and liquid permeable nonwoven fabric, an apertured film, or a laminate thereof, and the back sheet 3 can be a liquid impermeable or water repellent resin film, A laminate of a resin film and a non-woven fabric can be used.

  Examples of the processing method for forming the leak-proof groove 6 include embossing, heat embossing, ultrasonic embossing, and a combination of these.

The effect at the time of using the sanitary napkin 1 which is embodiment of this invention mentioned above is demonstrated.
The sanitary napkin 1 of the present embodiment has a large number of partitioned regions 22 partitioned by linear embosses 21 as shown in FIGS. 1 and 4, and is difficult to diffuse, and the pore size distribution measurement using a mercury porosimeter In the above, the top sheet 2 having high permeability satisfying the predetermined requirements, and the second sheet 5 having high permeability that is composed of the synthetic fiber and has low diffusibility, and the thickness and liquid holding amount satisfy the predetermined requirements. And. As described above, the sanitary napkin 1 of the present embodiment is formed by partially adhering the top sheet 2 and the second sheet 5 having low diffusibility and high permeability. The body fluid excreted from the wearer at the time of use is difficult to spread on the surface of the surface sheet 2, and the remaining body fluid is reduced by the surface sheet 2 and the second sheet 5 other than the absorber 4, and also the body fluid absorber 4 The transition time can be shortened.

  Moreover, the sanitary napkin 1 of this embodiment is provided with the absorption sheet 40 to which the creping process was performed, as shown in FIG. 5, and the second sheet 5 and the absorption sheet 40 are located at portions other than the leak-proof groove 6. Since it is not fixed, a space is formed between the uneven shape of the skin contact surface 40 a of the absorbent sheet 40 and the second sheet 5. Accordingly, the body fluid that has passed through the top sheet 2 and the second sheet 5 is likely to diffuse between the second sheet 5 and the absorbent sheet 40, so that a large amount of body fluid excreted from the surface of the top sheet 2 can be instantaneously transferred. The body fluid that has been transferred and diffused can be absorbed while effectively utilizing the absorption area of the absorbent sheet 40.

  In the sanitary napkin 1 of the present embodiment, the liquid diffusion area of the absorbent body 4 is 1.6 times the liquid diffusion area of the topsheet 2 in the measurement of liquid diffusibility in the state of an absorbent article (sanitary napkin 1). It is preferable that it is above, and it is preferable that it is twice or more. The liquid diffusion area, which is an index of liquid diffusibility, is measured by the following measurement method.

[Measurement method of liquid diffusivity]
The measurement is performed under the temperature and humidity conditions using an absorbent article (sanitary napkin 1) that has been left for one day or longer in an environment of 20 ° C. and 65% RH.
Place sanitary napkin 1 horizontally, place an acrylic plate injector (having a hole with a diameter of 10 mm) on it, apply a load of 5 g / cm ² , and equine blood (manufactured by Nippon Biotest Co., Ltd.) After 3 g of the solution was further dropped, the diffusion area on the surface sheet 2 immediately after 3 g of horse blood (manufactured by Nippon Biotest Co., Ltd.) was dropped from the same position after 3 minutes was measured. Next, the top sheet 2 and the second sheet 5 are quickly removed from the sanitary napkin 1, and the diffusion area of the absorbent body 4 is measured. For these measurements, the diffusion state immediately after dropping is recorded by various cameras (preferably one whose imaging data is digitized), the diffusion contour is marked, and the image analysis device (manufactured by NEXUS: Their diffusion areas are determined using NEW QUEBE Ver. 4.20).

  The absorbent article of the present invention is not limited to the sanitary napkin of the above-described embodiment, and can be appropriately changed.

  For example, the sanitary napkin 1 according to this embodiment includes the leak-proof groove 6 as shown in FIGS. 1 and 4, but may not be provided. When the leak-proof groove 6 is not provided, the second sheet 5 and the absorbent body 4 are partially bonded by an adhesive or heat fusion in the same manner as the method of partially fixing the top sheet 2 and the second sheet 5. It is preferable that it is fixed to.

  The absorbent article of the present invention may be a panty liner, an incontinence pad, a disposable diaper or the like in addition to the sanitary napkin of the above-described embodiment.

Hereinafter, although the absorbent article of this invention is further demonstrated using an Example, this invention is not restrict | limited at all by this Example.
[Example 1]
A sanitary napkin shown in FIG. 1 was prepared and used as a sample of Example 1. The material used was a commercially available sanitary napkin (Laurie Super Slim Guard manufactured by Kao Corporation). However, the surface sheet of the sanitary napkin and the second sheet between the surface sheet and the absorber are not used, and instead, the surface sheet and the second sheet prepared as follows are used. The sanitary napkin of Example 1 was obtained.

(Preparation of surface sheet)
A core-sheath type composite fiber (core is polypropylene and sheath is polyethylene) having a fiber diameter of 4.0 dtex elongation ratio of 6% and a non-extendable core-sheath type composite fiber (core is polyethylene terephthalate, sheath is 3.3 dtex) Polyethylene) is passed through a card machine at a ratio of 50 wt% to form a web, and the web is introduced into a heat embossing device, and linear emboss 21 (first linear emboss 21a and second linear A plurality of embosses 21b) were formed. Next, the web was introduced into a hot air spraying apparatus, and hot air treatment was performed by air-through processing to obtain a surface sheet having partitioned regions 22 partitioned by linear embosses 21. The formation pattern of the linear embossing 21 of the obtained surface sheet is the pattern shown in FIG. 3, and the width W1 of each of the first and second linear embossing 21a and 21b is 0.5 mm, The distance between the embosses 21a and the distance W2 between the second linear embosses 21b were 6 mm, and the angle α between the first linear emboss 21a and the second linear emboss 21b was 56 °. When the pore size distribution of the produced surface sheet was measured based on the above-mentioned [Method for measuring the pore size distribution of the surface sheet], the pore volume in the region having a pore diameter of 100 μm or less was 8% of the total pore volume. Incidentally, the basis weight of the resulting surface sheet was 25 g / m ^2.

(Production of second sheet)
A synthetic fiber made of a polyethylene / polyethylene terephthalate composite resin having a fiber diameter of 2.2 dtex is passed through a card machine to form a web, the web is introduced into a hot air blowing device, hot air treatment is performed by air-through processing, and then roll embossing is performed. A second sheet was obtained. The obtained second sheet had a thickness of 0.2 mm and a liquid holding amount of 26 g / m ² . The basis weight of the obtained second sheet was 25 g / m ² .

A SEBS-based hot melt adhesive was applied between the prepared topsheet and the prepared second sheet, and the prepared topsheet and the prepared second sheet were partially fixed. The amount of hot melt adhesive applied was 5 g / m ² .

[Example 2]
The topsheet used in Example 1 described above was changed to a topsheet produced as follows, and the absorbent sheet was a wet state using a commercially available napkin (Laurier Super Slim Guard manufactured by Kao Corporation). A sanitary napkin of Example 2 was obtained in the same manner as in Example 1 described above, except that a crepe was used and a wrinkle at 1 mm intervals could be visually confirmed.

(Preparation of the surface sheet used for the sanitary napkin of Example 2)
A synthetic fiber made of a polyethylene / polyethylene terephthalate composite resin having a fiber diameter of 4.4 dtex was passed through a card machine to form a web, and the web was introduced into a hot air spraying apparatus, and hot air treatment was performed by air-through processing to obtain a surface sheet. . The pattern of the linear emboss 21 formed on the obtained surface sheet was the same as the pattern of the surface sheet used for the sanitary napkin of Example 1. When the pore size distribution of the produced surface sheet was measured based on the above-mentioned [Method for measuring the pore size distribution of the surface sheet], the pore volume in the region having a pore diameter of 100 μm or less was 5% of the total pore volume. Incidentally, the basis weight of the resulting surface sheet was 25 g / m ^2.

[Comparative Example 1]
A sanitary napkin of Comparative Example 1 was obtained in the same manner as in Example 1 except that the surface sheet used in Example 1 was changed to the surface sheet produced as follows.

(Preparation of the surface sheet used for the sanitary napkin of the comparative example 1)
Synthetic fibers made of a polyethylene / polyethylene terephthalate composite resin having a fiber diameter of 2.2 dtex were passed through a card machine to form a web, and the web was introduced into a hot air spraying device and subjected to hot air treatment by air-through processing to obtain a surface sheet. . In the obtained surface sheet, the linear emboss 21 was not formed, but a plurality of three-dimensional apertures were formed instead. The area ratio of the three-dimensional openings was 6%, and the formation pitch of the three-dimensional openings was 2 mm. When the pore size distribution of the produced surface sheet was measured based on the above-mentioned [Method for measuring the pore size distribution of the surface sheet], the pore volume in the region having a pore diameter of 100 μm or less was 35% of the total pore volume. Incidentally, the basis weight of the resulting surface sheet was 25 g / m ^2.

[Comparative Example 2]
The surface sheet used in Example 1 described above is changed from a surface sheet having a basis weight of 25 g / m ² to a surface sheet having a basis weight of 30 g / m ² , and the second sheet used in Example 1 is not used. In the same manner, a sanitary napkin of Comparative Example 2 was obtained. When the pore size distribution of the produced surface sheet was measured based on the above-mentioned [Method for measuring the pore size distribution of the surface sheet], the pore volume in the region having a pore diameter of 100 μm or less was 8% of the total pore volume.

[Evaluation]
The following evaluation was performed using each sanitary napkin, and the results are shown in Table 1.
The diffusion area of the topsheet and the absorber was measured based on the above-mentioned [Method for measuring liquid diffusibility].

[Liquid remaining amount of surface sheet]
The measurement is performed under the temperature and humidity conditions using an absorbent article (sanitary napkin 1) that has been left for one day or longer in an environment of 20 ° C. and 65% RH.
Place the sanitary napkin 1 horizontally, place an acrylic plate injector (with a hole of 10 mm in diameter) on it, apply a load of 5 g / cm ² , and defibrillate horse blood (Nippon Biotest Co., Ltd.) 3 g), 3 minutes later, immediately after 3 g of defibrinated horse blood (manufactured by Nippon Biotest Co., Ltd.) was dropped from the same position, the topsheet was taken out from the sanitary napkin, and the topsheet before and after injection Was measured, and the weight of defibrinated horse blood remaining in the sheet was measured to determine the amount of liquid remaining on the top sheet.

[Body fluid absorption time]
The measurement is performed under the temperature and humidity conditions using an absorbent article (sanitary napkin 1) that has been left for one day or longer in an environment of 20 ° C. and 65% RH.
Place sanitary napkin 1 horizontally, place an acrylic plate injector (having a hole of 10 mm in diameter) on it, apply a load of 5 g / cm ² , and equine blood (manufactured by Nippon Biotest Co., Ltd.) 3 g of 3 hours after dropping 3 g of horse blood (manufactured by Nippon Biotest Co., Ltd.) from the same position 3 minutes later, the time taken for the horse blood to completely transfer from the surface sheet to the absorber visually Was measured as the body fluid absorption time of the sanitary napkin.

  From the results shown in Table 1, in the samples of Example 1 and Example 2, the diffusion area of the surface sheet is narrower than the diffusion area of the absorber compared to the samples of Comparative Example 1 and Comparative Example 2, and the liquid residue of the surface sheet The amount was found to be small. In addition, it was found that the samples of Example 1 and Example 2 also had a shorter body fluid absorption time than the samples of Comparative Example 1 and Comparative Example 2.

DESCRIPTION OF SYMBOLS 1 Sanitary napkin 1b Side part 2 of sanitary napkin 2 Surface sheet 21 Linear embossing 21a 1st linear embossing, 21b 2nd linear embossing 22 Partition area | region 3 Back surface sheet 4 Absorber 40 Absorbing sheet 40a Absorbing sheet Skin contact surface 5 Second sheet 6 Leak-proof groove

Claims (1)

The surface sheet includes a heat-stretching fiber as a constituent fiber,
In the partition area, the heat extension fiber extends the length of the heat Shin long fibers by heating, claims mutual intersections of the heat extension length fibers crossed are joined by heat fusion 1 Or the absorbent article of 2.