KR20130080424A - Absorbent article - Google Patents

Abstract

The sanitary napkin 1 of this invention is equipped with the surface sheet 2, the back sheet 3, the absorber 4 arrange | positioned between these sheets 2, 3, and the second sheet 5. As shown in FIG. The surface sheet 2 and the second sheet 5 are partially fixed. The surface sheet 2 has a partition area 22 partitioned by a linear emboss 21 and is a sheet that satisfies predetermined requirements in measuring a pore diameter distribution by a mercury porosimeter. . The second sheet 5 is a sheet whose constituent fibers are synthetic fibers and whose thickness and liquid retention amount satisfy predetermined requirements.

Description

[0001] ABSORBENT ARTICLE [0002]

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

As a sanitary napkin having an excellent function in which no menstrual blood leakage occurs, Patent Document 1 describes a sanitary napkin in which a compression groove is formed in a mesh shape on an upper surface of an absorbent portion. Certainly, since the sanitary napkin described in Patent Document 1 is formed in a mesh-like shape with a compressed groove, menstrual blood is difficult to spread from the surface and menstrual blood leakage is less likely to occur, but so-called second sheet is not disposed in the sanitary napkin described in Patent Document 1, It is difficult to absorb menstrual blood instantaneously from the surface of the sanitary napkin.

For example, Patent Document 2 describes a relatively thin sanitary napkin in which a liquid permeable wipe acquisition sheet, which is a spunlace nonwoven sheet made of rayon and polyester fibers, is disposed between the top sheet and the absorbent core. For example, Patent Document 3 describes an absorbent article in which an absorbent core comprising a body capture distribution layer on the upper sheet side and a liquid storage layer on the rear sheet side is disposed between the liquid permeable top sheet and the liquid impermeable back sheet. It is described that the body trapping distribution layer is a web made of hydrophilic cellulose fibers in which wood pulp fibers are reinforced with an interfiber chemical reinforcing agent.

Certainly, the sanitary napkin of Patent Document 2 has a liquid permeable wipe acquisition sheet, which is a so-called second sheet, is arranged so that the body fluid can be dispersed in the transverse direction and instantaneously absorb the menstrual blood from the top sheet of the sanitary napkin. However, since the liquid permeable wipe acquisition sheet of the sanitary napkin of Patent Document 2 contains rayon which is a semi-synthetic fiber, it is easy to cause the fluid to leave fluid, and it is difficult to transfer the body fluid from the liquid permeable wipe acquisition sheet to the absorbent core. Therefore, it takes time to completely transfer the body fluid to the absorbent core.

Further, certainly, the absorbent article of Patent Document 3 is provided with a so-called second sheet body trapping distribution layer, so that it can quickly collect and temporarily retain the body fluid and can instantly absorb the body fluid from the upper sheet of the absorbent article. have. However, since the body capture distribution layer of the absorbent article of Patent Document 3 is a web made of hydrophilic cellulose fibers, the body capture distribution layer retains body fluids, and like the sanitary napkin of Patent Document 2, it is easy to cause the liquid to remain in the body capture distribution layer. It takes time to transfer the body fluid from the to the liquid storage layer.

Japanese Patent Publication No. 56-109660 US4950264A US5217445A

Accordingly, an object of the present invention is to provide an absorbent article which can hardly spread body fluids from the surface, reduce fluid remaining of body fluids other than the absorber, and shorten the transition time of the body fluids to the absorber.

The present invention is an absorbent article having a surface sheet disposed on the skin contacting surface side, a back sheet disposed on the skin non-contacting surface side, an absorber disposed between these sheets, and a second sheet disposed between the absorber and the surface sheet. In the absorbent article, the surface sheet and the second sheet are partially fixed. The surface sheet has a plurality of partition regions partitioned by linear embossing, and in the pore diameter distribution measurement having a pore diameter of 1 to 600 µm by a mercury porosimeter, pores of the region having a pore diameter of 100 µm or less (Iii) A sheet whose capacity is 10% or less of the total pore capacity. The second sheet provides an absorbent article in which the constituent fiber is a synthetic fiber, the thickness is 0.15 to 0.4 mm, and the liquid holding amount is 60 g / m 2 or less.

BRIEF DESCRIPTION OF THE DRAWINGS The top view which looked at the sanitary napkin which is one Embodiment of the absorbent article of this invention from the surface sheet side.
It is a perspective view which shows one Embodiment of the surface sheet which the sanitary napkin shown in FIG. 1 has.
FIG. 3 is an enlarged plan view of a part of the skin contact surface side of the surface sheet shown in FIG. 2. FIG.
4 is a cross-sectional view taken along line XX of FIG. 1.
FIG. 5 is an enlarged sectional view of a main part of an enlarged main part of FIG. 4. FIG.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated with reference to drawings based on the preferable embodiment.

The absorbent article of one embodiment of the present invention is a sanitary napkin 1, and as shown in Figs. 1 and 4, the surface sheet 2 disposed on the skin contacting surface side, the back sheet 3 disposed on the skin non-contacting surface side, The absorber 4 arrange | positioned between the front sheet 2 and the back sheet 3, and the second sheet 5 arrange | positioned between the absorber 4 and the surface sheet 2 are provided.

In addition, in this specification, the "skin contact surface side" is the surface side arrange | positioned at the skin side of a wearer at the time of wearing among the front and back surfaces of the structural member of the sanitary napkin 1, and the "skin non-contact surface side" is wearing It is the surface side arrange | positioned on the opposite side to the skin side of a wearer at the time. 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.

As shown to FIG. 1, FIG. 4, in this embodiment, the rectangular absorber 4 long in the same direction as the front-back direction at the time of mounting, and the second sheet 5 of the same size substantially the same shape as the absorber 4 ). The second sheet 5 is disposed on the skin contact surface side of the absorber 4. As shown in FIG. 1, FIG. 4, the surface sheet 2 has covered the whole area | region of the skin contact surface side of the rectangular second sheet 5, and the longitudinal direction Y of the absorber 4 and the second sheet 5 was carried out. Direction) and a portion extending outward from each of both sides. As shown in FIG. 1, FIG. 4, the back sheet 3 has covered the whole area | region of the skin non-contact surface side of the absorber 4, and the both ends of the absorber 4 and the 2nd sheet 5 in the longitudinal direction (Y direction). And portions extending outwardly from each side. As shown in FIG. 1, the front sheet 2 and the back sheet 3 are fused (in the portion extending outwardly from each of both ends in the longitudinal direction (the Y direction) of the absorber 4 and the second sheet 5). Heat embossed, ultrasonic embossed, high frequency embossed), and as shown in Fig. 4, in the portion extending outward from each of the both sides of the longitudinal direction (Y direction) of the absorber 4 and the second sheet 5, It is fixed by an adhesive. In this manner, the absorber 4 and the second sheet 5 are sandwiched between the front sheet 2 and the back sheet 3.

The surface sheet 2 which the sanitary napkin 1 has has the several partition area | region 22 partitioned by the linear emboss 21 as shown in FIG. Since the surface sheet 2 has the partition area 22 in this way, the body fluid of the wearer absorbed in one partition area 22 spreads beyond the partition area 22 to another adjacent partition area 22. It's hard to be. Here, "linear emboss" means that the embossed shape is not limited to a straight line in plan view but includes a curve. The embossed shape is a continuous line and does not include intermittent lines such as broken lines. However, even if it is an intermittent line, if it is an interval less than 1 mm, since it has an effect similar to a continuous line, it shall be included. The shape of the partitioned partition area 22 may be partitioned into a rectangle or a curve, in addition to the rhombus lattice pattern. Plaid is particularly preferred.

As shown in FIG. 3, the surface sheet | seat 2 of this embodiment is linear emboss 21, and is parallel with each other and the 1st linear linear emboss 21a formed in parallel at predetermined intervals, and is parallel with each other. And a plurality of second linear embosses 21b formed at predetermined intervals, and the first linear emboss 21a and the second linear emboss 21b intersect with each other at an angle α. . The groove width W1 of the first linear emboss 21a and the groove width of the second linear emboss 21b are the same, and adjacent to each other with the spacing W2 of the first linear emboss 21a adjacent to each other. The spacing between the second linear embosses 21b is also the same.

As shown in FIG. 3, it is preferable that the groove width W1 of the 1st linear embossing 21a is 0.1-1.5 mm, especially 0.3-0.9 mm from a viewpoint of reliably fixing a constituent fiber in the said linear embossing. . Moreover, it is preferable that the space | interval W2 of 1st linear embossing 21a comrades is 2-14 mm, especially 2-8 mm from a viewpoint of making both liquid permeation and liquid suction raise. The groove width W1 and the interval W2 are measured in the direction orthogonal to the line. The width of the line may vary from the intersection, but W1 is measured at the intersection and the midpoint of the intersection. W2 is measured by the line which connects the stool of the partition area | region 22. As shown to FIG.

When the surface sheet 2 of this embodiment is assembled to the sanitary napkin 1, the linear sheet | seat emboss 21 is formed by performing heat embossing from the skin contact surface side toward the skin side of a wearer, The part which formed the boss 21 becomes a recessed part. In the linear embossing 21 site | part, the component fiber mentioned later is heat-sealed in the thickness direction.

Since the linear emboss 21 is formed in a lattice shape by the first linear emboss 21a and the second linear emboss 21b, the surface sheet 2 has a linear emboss 21. The partitioned areas 22, 22, ... partitioned by are formed. Each partition area | region 22 is an area | region enclosed by the linear embossing 21, respectively, and is a rhombus shape in plan view. The central portion of each partition region 22 is raised relative to the linear embossing 21 (concave portion) surrounding the partition region 22 to become a convex portion.

As the surface sheet 2 of this invention, the sheet which has high permeability is used. It can be seen that good liquid permeability is exhibited when there are few voids brought about by the fiber distribution in the sheet, particularly when the pore area is small. In this case, the pore capacity in the region having a pore diameter of 100 μm or less is preferably a sheet of 10% or less of the total pore capacity, and the pore capacity is preferably a sheet of 8% or less of the total pore capacity, and more preferably 6% or less. Do. Thus, the minimum of the pore capacity of the area | region with a pore diameter of 100 micrometers or less is not restrict | limited in particular, The smaller it is, the more preferable.

The pore diameter distribution of the surface sheet 2 is measured using a mercury porosimeter (Shimadzu Corporation) based on a mercury porosimetry (JIS R 1655). The mercury intrusion method is a method for obtaining information on the physical shape of the surface sheet 2 by measuring the size and volume of the constituent fibers of the surface sheet 2 (pore). The principle of the mercury porosimetry is to pressurize mercury and pressurize it into the pores of the object to be measured, and to measure the relationship between the pressure applied at this time and the volume of mercured (infiltrated) mercury. Hereinafter, the measuring method of the pore diameter distribution of the surface sheet 2 which uses a mercury porosimeter is demonstrated.

[Measurement Method of Pore Diameter Distribution of Surface Sheet]

First, the surface sheet 2 is taken out from the sanitary napkin 1 (absorbent article). Next, the surface sheet 2 taken out is cut | disconnected to 24 mm x 5 mm. Three pieces are cut in total, and these cut samples are set so that they do not overlap each other in the sample cell of a mercury porosimeter (Shimadzu Corporation), and the pore diameter distribution of pore diameters 1-600 micrometers is measured. . Based on the pore distribution curve (differential and integration curve) of the surface sheet 2 obtained, the sum of the capacity | capacitances reaching pore diameters 1-600 micrometers is made into all pore capacities, and the said of the pore capacitance of the area | region of 100 micrometers or less of pore diameters Find the ratio of the total pore capacity. Moreover, based on the pore distribution curve (differential and integral curve) of the surface sheet 2 obtained, the ratio with respect to the said total pore capacity of the pore capacity of the area | region of 1-100 micrometers of pore diameters is calculated | required.

In the pore diameter distribution measurement having a pore diameter of 1 to 600 µm by a mercury porosimeter as described above, the surface sheet 2 having a pore capacity of a region having a pore diameter of 100 µm or less is 10% or less of the total pore capacity (2). ) Is an air through nonwoven fabric composed of only non-thermally elongated fibers of at least 4.4 dtex, an air through nonwoven fabric composed of thermally elongated fibers of at least 3.3 dtex, a non-thermally elongated fiber of at least 3.3 dtex and a thermally elongated fiber. An air-through nonwoven fabric is exemplified, and an air-through nonwoven fabric composed of non-heat-expanded fiber and heat-extension fiber of 3.3 dtex or more is preferable from the viewpoint of achieving both absorbency and feel. Since such a nonwoven fabric is further partitioned by linear embossing, even if the liquid tries to diffuse into the nonwoven fabric as the surface sheet, diffusion is suppressed in the linear embossing, whereby liquid permeability to the lower layer is more likely to be exhibited.

In the case where the surface sheet 2 is an air through nonwoven fabric containing thermally elongated fibers, the surface sheet 2 is specifically in the compartment region 22, and the length of the thermally elongated fibers is elongated by heating, and the compartment region is formed. In (22), the non-woven fabric in which the mutual intersection of the said thermally stretched fibers crossed was joined by heat fusion. As described above, the thermally elongated fiber is a thermally fused fiber bonded by thermal fusion, and the thermal fusion is, for example, thermal fusion through an air through method. It is preferable that the heat-sealable fiber as the heat-extending fiber is a heat-scalable composite fiber composed of a heat-sealing component and a high melting point component having a higher melting point than the heat-sealing component. It is more preferable that it is a core sheath type heat-expandable composite fiber made into a core. It is preferable that the heat-sealing component and the high melting point component are thermoplastic resins. As the heat-sealing component, for example, polyethylene, polypropylene, polybutene-1, polypentene-1, random or block copolymers thereof, and the like can be exemplified. As a high melting point component, polyester, such as polyethylene terephthalate and polybutylene terephthalate, polyamide, such as nylon-6 or nylon-66, etc. can be illustrated, for example. Preferable combinations of the heat-sealing component and the high melting point component include polyethylene and polyethylene terephthalate, polyethylene and polypropylene, low melting polyethylene terephthalate and polyethylene terephthalate, polyethylene and polybutylene terephthalate, and the like. It is not limited. In addition to the concentric type, the core-sheath composite fiber may be an eccentric type or a core component exposed to a part of the entire circumference of the fiber.

The thermally extensible composite fiber is a fiber whose length is elongated by heating, and is a fiber whose temperature is elongated at 90 ° C or higher, preferably at 110 ° C to 130 ° C. The heat-expandable composite fiber can be stretched at the time of manufacture of the surface sheet 2, and can form uneven | corrugated large undulations in the surface sheet 2. Therefore, after completion as the surface sheet 2, the majority of them are in an elongated state, which does not mean that the fibers are further elongated from the state. In addition, the thermally extensible composite fibers after stretching are also included in the thermally extensible composite fibers.

Examples of the thermally extensible composite fibers include fibers in which the crystal state of the resin is changed and elongated by heating, or fibers in which crimp is released and the appearance length is elongated as crimped fibers. It can be illustrated. As the thermally stretchable composite fiber, the elongation rate at a temperature of 10 ° C. higher than the softening point of the heat-sealing component and 10 ° C. lower than the melting point is 5 to 40%, particularly 10 to 30%. It is preferable at the point to form. Preferred examples of thermally extensible composite fibers are described in paragraphs [0024] to [0040] of JP 2005-350836 A.

When the surface sheet 2 is an air through nonwoven fabric containing a thermally stretchable fiber (thermally stretchable composite fiber), the ratio of the thermally stretchable composite fiber is the surface sheet 2 in view of exerting a feel, concealment and high permeability. It is preferable that it is 40-100 mass% in the constituent fiber of the thing, It is more preferable that it is 70-100 mass%, It is especially preferable that it is 95-100 mass%. As a fiber mix | blended other than a thermally extensible composite fiber, the fiber (non composite fiber) etc. which consist of thermoplastic resins can be illustrated.

In the case where the surface sheet 2 is an air through nonwoven fabric including thermally elongated fibers (thermally extensible composite fibers), the basis weight is preferably 20 to 50 g / m 2.

When the surface sheet 2 is an air-through nonwoven fabric composed of only heat-bonding fibers (non-heat-extending fibers) of 4.4 dtex or more (preferably 4.4 to 10 dtex), they are synthetic fibers. For example, polyethylene, poly Fibers made of a resin such as polyester such as propylene, polyethylene terephthalate and polybutylene terephthalate, and polyamide such as nylon-6 or nylon-66 can be formed alone or in combination of two or more thereof. Moreover, it is preferable that the basis weight is 20-50 g / m <2>.

In the second sheet 5 of the sanitary napkin 1, its constituent fibers are synthetic fibers. Thus, since the second sheet 5 is made of synthetic fibers, the diffusibility can be suppressed low. In addition, the synthetic fiber constituting the second sheet 5 is preferably a weak hydrophilic fiber from the viewpoint of mechanical suitability while suppressing the diffusibility to be low. As the synthetic fiber constituting the second sheet 5, a fiber made of a resin such as polyester such as polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, or polyamide such as nylon-6 or nylon-66 is used alone. Alternatively, two or more kinds may be mixed and formed. In addition, mixing here includes using 2 or more types of resin from which melting | fusing point differs as a core-sheath type composite fiber or a side-by-side type composite fiber.

Since the second sheet 5 is a sheet having high permeability and moderate diffusibility, the thickness is 0.15 to 0.4 mm. However, the second sheet 5 is 0.15 to 0.4 mm from the viewpoint of suppressing the storage capacity of the body fluid low and exhibiting high permeability. It is preferable and it is more preferable that it is 0.2-0.3 mm. The thickness is measured under a 0.5 kPa load in view of the mounting condition.

In addition, since the second sheet 5 is a sheet having high permeability and moderate diffusibility, the liquid retention amount is 60 g / m 2 or less sheet, but from the viewpoint of exhibiting high permeability, the second sheet 5 is preferably 35 g / m 2 or less. It is more preferable that it is a sheet of 25 g / m <2> -5g / m <2>. In this way, the lower limit of the liquid retention amount of the second sheet 5 is preferable. The liquid retention amount of the second sheet 5 is measured by the following measuring method.

[Measurement method of liquid retention]

From the sanitary napkin 1 (absorbent article), the second sheet 5 is taken out. Next, the taken out second sheet 5 is cut into 5 cm x 5 cm square. The mass of this initial cut sample is weighed, and the cut sample is placed in a beaker containing 500 mL of distilled water and left to stand for 1 minute. Thereafter, the cut sample is taken out, and the cut sample is left to stand for 10 minutes in a suspended state on a pole. Thereafter, the sample is centrifugally dehydrated (800 rpm) for 10 minutes, and then its mass is measured, and the liquid retention amount is obtained from the equation shown below.

Liquid retention amount (g / m 2) = {mass of cleaved sample after centrifugal dehydration (g)-mass of initial cleaved sample (g)} / area of initial cleaved sample (m 2)

As the second sheet 5 which has a thickness of 0.15 to 0.4 µm and satisfies the requirement that the liquid retention amount is 60 g / m 2 or less, an air through nonwoven fabric in which mutual intersections of crossed synthetic fibers are joined by air fusion of an air through method Can be preferably used. In addition to the air through nonwoven fabric, a point bond nonwoven fabric, a spun bond nonwoven fabric, a spunlace nonwoven fabric, or the like may be used as long as the thickness requirement and the liquid retention 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 surface sheet 2 and the second sheet 5 of the sanitary napkin 1 are partially fixed. Thereby, lifting of a surface sheet is suppressed, the adhesiveness of the surface sheet 2 and the second sheet 5 improves, and liquid flows easily. For the same reason, it is preferable that the second sheet 5 and the absorbent body 4 are also partially fixed as described later. Partially fixing means having a fixing part consisting of points and lines, and the fixing part is distributed on the entire sheet surface, and does not need to be uniformly distributed, but means that the entire fixing is not performed between the sheets to be fixed. The area of the fixed portion is preferably about 10 to 60% of the total area of the adhered sheet. Specifically, the surface sheet 2 and the second sheet 5 are partially fixed by applying an adhesive intermittently or by performing an intermittent heat seal. In the case of applying the adhesive intermittently, the adhesive may be applied intermittently using a known means, for example, a slot coat gun, in a spiral form using a spiral spray gun, or intermittently in a mist shape using a spray gun. The surface sheet 2 and the second sheet 5 are partially applied while being coated in a dot shape using a dot gun and maintaining the permeability of the body fluid between the surface sheet 2 and the second sheet 5. Glue them together. As the adhesive to be applied, for example, a hot melt adhesive is preferably used.

As a hot melt adhesive agent, a styrene type, an olefin type, etc. can be illustrated. As the styrene-based hot melt adhesive, styrene-butadiene-styrene copolymer (SBS), styrene-isoprene-styrene copolymer (SIS), styrene-ethylene-butylene-styrene copolymer (SEBS) which is a hydrogenated product of SBS, and these Blend type hot melt adhesives blended with two or more kinds can be used. Among these, especially from the viewpoint of being easy to balance tack force and cohesion force, a blend type hot melt adhesive of SIS and SBS, or a blend type hot melt adhesive of SIS and SEBS is preferably used in the present invention. It is preferable that the application amount of a hot melt adhesive agent is 3-10 g / m <2>.

When performing heat sealing intermittently, the laminated sheet of the surface sheet 2 and the second sheet 5 is flattened with the thermal emboss roll, for example using the thermal emboss roll and the flat roll which have a some convex part. The surface sheet 2 and the second sheet 5 are partially fused by conveying between the rolls and embossing. It is preferable that the space | interval of the some fusion | melting point formed by welding is 5-15 mm from a viewpoint of providing moderate adhesiveness between the surface sheet 2 and the second sheet 5, and maintaining permeability of a body fluid.

The absorbent article of the present embodiment is a sanitary napkin 1, and since the thinness of the product itself is required, the absorbent body 4 is formed of a multi-pleated absorbent sheet 40. Specifically, the absorbent sheet 40 is an absorbent sheet whose surface is pleated in shape and has a super absorbent polymer. As the absorbent sheet 40, for example, an absorbent sheet prepared by the method described in Japanese Patent Application Laid-Open No. Hei 8-246395, a ground pulp and an absorbent polymer supplied in an air stream are deposited, and then an adhesive (for example, vinyl acetate). Superabsorbent polymer during the manufacturing process of absorbent sheet, spunbond or meltblown nonwoven fabric obtained by applying hot melt adhesive between the dry sheet fixed to the adhesive of the system, PVA, etc., paper or nonwoven fabric, and then spraying the superabsorbent polymer. The absorption sheet obtained by mix | blending these, etc. can be used. Such an absorbent sheet can be cut into a predetermined shape and used as an absorbent sheet. In addition, a plurality of absorbent sheets may be bonded together to form a multilayer sheet, or a single absorbent sheet may be folded and folded, and the layers may be bonded to each other to form a multilayer sheet. The multilayer sheet thus obtained may be used as an absorbent sheet. In addition, as the sanitary napkin 1 of the present embodiment, an absorbent body in which an absorbent core composed of particles of a water absorbent polymer and a fiber material used for absorbent articles such as sanitary napkins and the like is coated with tissue paper can also be used.

The absorbent sheet 40 of the sanitary napkin 1 of this embodiment can use the well-known thin and absorbent absorbent sheet of Unexamined-Japanese-Patent No. 8-246395 from a viewpoint of making water absorption high and thinning. have. Preferably, the obtained absorbent sheet is wetted again if it is wet or dried, and the wet absorbent sheet is firmly attached to the roll surface of the heated cylindrical so-called Yankee dryer by pressing, drying, and then through the blade, It is formed by creping to remove the dried absorbent sheet from the Yankee dryer. By creping in this manner, a large number of wrinkles that can be seen with the naked eye are formed on the surface of the absorbent sheet, and the surface of the absorbent sheet 40 is wrinkled. As for the space | interval of a wrinkle, 0.2mm-2mm are preferable. By laminating the surface of the corrugated absorbent sheet 40 (skin contact surface 40a) and the second sheet 5, the body fluid which has quickly passed through the surface sheet 2 is diffused in the second sheet 5, thereby absorbing The liquid is transferred to the sheet 40. It is thought that some spaces due to wrinkles are formed between the absorbent sheet 40 and the second sheet 5, so that the body fluid diffusion in the second sheet 5 is promoted more than in the case of being in close contact with each other. As a result, it is thought that the body fluid diffused in the second sheet 5 can be absorbed in a relatively large area of the absorbent sheet 40. In addition, although the absorption sheet 40 of this embodiment is formed by carrying out creping process, you may dry by methods other than creping process.

The sanitary napkin 1 of the present embodiment is the cross-sectional view of the sanitary napkin 1 from the viewpoint of facilitating absorption of the body fluid having passed through the surface sheet 2 and the second sheet 5 into the absorber 4, and thus the surface sheet 2. It is preferable that the average space | interval in the width direction of the partition area | region 22 of () is 20-180 times of the interfiber distance of the constituent fiber in the skin contact surface 40a of the absorbent sheet 40, and is 25-160 times More preferred.

In detail, the cross-sectional view of the sanitary napkin 1 shown in FIG. 4 has shown sectional drawing in the X1-X1 line | wire shown in FIG. 1, and the cross-sectional view of the sanitary napkin 1 shown in FIG. 5 has shown the principal part enlarged sectional view. Here, the line X1-X1 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 area 22 of the surface sheet 2 observes the cross section of the surface sheet 2 using a scanning electron microscope (SEM), and forms the partition area 22. Center point in the X direction and the second linear emboss between the first linear emboss 21a and the second linear emboss 21b, more specifically, the groove of the first linear emboss 21a. It can obtain | require by measuring between the center points of the X direction in the groove | channel of 21b. The measurement site is set to 10 sites, and the average value is defined as the average interval in the width direction (X direction) of the partition area 22. In addition, the interfiber distance of the constituent fibers in 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 measurement site is set to 10 sites, and the average value is used as the distance between fibers of the constituent fibers in the skin contact surface 40a.

1 and 2, the sanitary napkin 1 of the present embodiment has a grooved groove 6 formed by integrally compressing the surface sheet 2, the second sheet 5, and the absorber 4, The surface of the surface sheet 2 is provided along both side portions 1b and 1b in the longitudinal direction (Y direction) of the sanitary napkin 1. In this embodiment, as shown in FIG. 1, on both sides of the surface sheet 2 in the excretion area A which contacts the body fluid excretion part of a wearer, it is convex shape to the outer side of an X direction by planar view. A pair of heat-dissipating grooves 6A and 6A are formed to be curved, and the front region B extending forward of the excretory region A and the rear region C extending rearward of the excretory region A are formed. ), A pair of heat-resistant grooves 6B, 6B and a pair of heat-resistant grooves 6C, 6C are formed to be curved in a convex shape outwardly in the X direction in plan view. As shown in FIG. 1, the heat release groove 6 of the present embodiment is connected to each of the heat release groove 6A, the heat release groove 6B, and the heat release groove 6C to form an annular electric pole groove. .

As described above, the sanitary napkin 1 is partially fixed to the surface sheet 2 and the second sheet 5, and in the present embodiment, as shown in FIG. 4, the second sheet 5 and the absorbent body 4. Is partially fixed by the heat release groove 6. That is, the second sheet 5 and the absorber 4 are not fixed except for the heat release groove 6. In detail, the surface sheet 2 and the second sheet 5 are partially fixed by applying an adhesive intermittently or by performing an intermittent heat seal, in particular, the partition area 22 of the surface sheet 2. The surface sheet 2 and the second sheet 5 are intermittently fixed to each other at the position of the linear emboss 21 (concave portion) that forms the shape. In addition, since the crepe treatment is performed on the skin contact surface 40a of the absorber 4 as described above, an uneven shape is formed in the shape of a wrinkle. Accordingly, the second sheet 5 and the absorbent body 4 have irregularities in the skin contact surface 40a of the absorbent sheet 40 formed by creping, as shown in FIG. A space is formed between the shape and the second sheet 5.

The formation material of the sanitary napkin 1 of this embodiment is demonstrated.

The front sheet 2 and the back sheet 3 can be used without particular limitation as long as they are usually used for absorbent articles such as sanitary napkins and panty liners. For example, as the front sheet 2, a hydrophilic and liquid permeable nonwoven fabric, a perforated film, a laminate thereof, and the like can be used. As the back sheet 3, a liquid impermeable or water repellent resin film, The laminated body of a resin film and a nonwoven fabric etc. can be used.

The processing method for forming the heat release groove 6 may be embossed, heat embossed, ultrasonic embossed, or a combination thereof.

The effect of using the sanitary napkin 1 which is embodiment of this invention mentioned above is demonstrated.

Since the sanitary napkin 1 of this embodiment has many partition regions 22 partitioned by the linear emboss 21, as shown to FIG. 1, FIG. 4, it is hard to spread | diffused and a mercury porosimetry ( a pore diameter distribution measurement using a porosimeter, comprising: a surface sheet 2 having a high permeability that satisfies predetermined requirements; Since it is comprised from synthetic fiber, it is provided with the second sheet | seat 5 of the high permeability which is low diffusivity and whose thickness and liquid retention amount satisfy | fill predetermined requirements. As described above, the sanitary napkin 1 of the present embodiment is formed by partially fixing the surface sheet 2 and the second sheet 5 having low diffusivity and high permeability, so that the sanitary napkin 1 is used at the time of use. The body fluid excreted from the wearer is hard to spread on the surface of the surface sheet 2, and the body fluid absorbent is reduced in the surface sheet 2 and the second sheet 5 other than the absorber 4, and the body body absorber We can shorten transition time to (4).

In addition, the sanitary napkin 1 of this embodiment is equipped with the absorbent sheet 40 to which crepe process was given, as shown in FIG. 5, and the second sheet 5 and the absorbent sheet 40 are other than the heat sink 6 Since it does not adhere in the part of, the space is formed between the uneven | corrugated shape of the skin contact surface 40a of the absorbent sheet 40, and the second sheet 5. As shown in FIG. Therefore, since the body fluid that has passed through the surface sheet 2 and the second sheet 5 is likely to be diffused between the second sheet 5 and the absorbent sheet 40, a large amount of the body fluid discharged from the surface sheet 2 is removed from the surface of the surface sheet 2. It can be instantaneously transferred, and the body fluid diffused and diffused can be absorbed while effectively utilizing the absorption area of the absorbent sheet 40.

As for the sanitary napkin 1 of this embodiment, in the measurement of the liquid diffusivity in the state of an absorbent article (physiological napkin 1), the liquid diffusion area of the absorber 4 is 1.6 times or more of the liquid diffusion area of the surface sheet 2. It is preferable and it is preferable that it is 2 times or more. The liquid diffusion area which is an index of liquid diffusivity is measured by the following measuring method. In addition, there is no restriction | limiting in particular in an upper limit, The higher it is, the more preferable, but if it is about 1.8 times, a satisfactory effect will be acquired.

[Measurement Method of Liquid Diffusion]

The measurement is carried out under these temperature and humidity conditions using an absorbent article (physiological zone 1) that has been left for 1 day or more under 20 ° C and 65% RH environment.

The sanitary napkin 1 is placed horizontally, and an acrylic plate injector (having a hole of 10 mm in diameter) is placed thereon, and a load of 5 g / cm 2 is applied thereto to give 3 g of horse blood (manufactured by Nippon Biotest Co., Ltd.). After dripping, the diffusion area in the surface sheet 2 immediately after dripping 3 g of horse blood (made by Nippon Biotest Co., Ltd.) from the same position is measured again after 3 minutes. Next, the surface sheet 2 and the second sheet 5 are quickly removed from the sanitary napkin 1, and the diffusion area of the absorber 4 is measured. In such a measurement, the diffusion state immediately after dripping is recorded by various cameras (preferably, the photographing data is electronicized), the contour of the diffusion is marked, and the image analysis device (manufactured by NEXUS: NEW QUBE Ver. 4.20) to find their diffusion area.

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

For example, in the sanitary napkin 1 of this embodiment, although the fleece groove 6 is provided as shown to FIG. 1, FIG. 4, you may not need it. When not provided with the grooved groove 6, the second sheet 5 and the absorbent body 4 are partly formed by an adhesive or heat fusion in the same manner as the method of partially fixing the surface sheet 2 and the second sheet 5. It is preferable that it is fixed by.

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

(Example)

Hereinafter, although the absorbent article of this invention is demonstrated in detail using an Example, this invention is not restrict | limited by this Example.

[Example 1]

The sanitary napkin shown in FIG. 1 was produced and used as the sample of Example 1. As a material used, a commercial sanitary napkin (Lorie Super Slim Guard manufactured by Kao Kabushiki Kaisha) was used. However, the sanitary napkin of Example 1 was obtained using the surface sheet of this sanitary napkin and the second sheet between the said surface sheet and an absorber instead, using the surface sheet and the second sheet produced as follows instead. .

(Production of surface sheet)

Core-sheath type thermally extensible composite fiber (core is polypropylene, cisga polyethylene) with a fiber diameter of 4.0 dtex 6% elongation, and non-extension core-sheath type composite fiber (core is polyethylene tere) of 3.3 dtex Phthalate and cis polyethylene are passed through the carding machine at a rate of 50wt% to form a web, and the web is introduced into a heat embossing device to form a linear emboss 21 (first linear embossing) on the web. A plurality of (21a) and the second linear embossing 21b) were formed. Subsequently, the web was introduced into a hot air jetting device, a hot air treatment by air through processing was performed, and a surface sheet having a partition region 22 partitioned by a linear emboss 21 was obtained. The formation pattern of the linear embossing 21 of the obtained surface sheet is the pattern shown in FIG. 3, and width W1 of each of the 1st and 2nd linear embossing 21a, 21b is 0.5 mm, and the 1st linear embossing (21a) The space | interval between each other and the space | interval W2 between 2nd linear emboss 21b are 6 mm, and the angle (alpha) which the 1st linear emboss 21a and the 2nd linear emboss 21b make is 56 °. When the pore diameter distribution of the produced surface sheet was measured based on [the measuring method of the pore diameter distribution of a surface sheet] mentioned above, the pore capacity of the area | region with a pore diameter of 100 micrometers or less was 8% of the total pore capacity. In addition, the basis weight of the obtained surface sheet was 25 g / m <2>.

(Production of the second sheet)

A synthetic fiber made of a composite resin of polyethylene / polyethylene terephthalate having a fiber diameter of 2.2 dtex is passed through a carding machine to form a web, the web is introduced into a hot air spray device, and hot air treatment is performed by air through processing. Roll embossing to obtain a second sheet. The thickness of the obtained second sheet was 0.2 mm and the liquid retention amount was 26 g / m 2. In addition, the basis weight of the obtained second sheet was 25 g / m <2>.

Between the fabricated surface sheet and the fabricated second sheet, a SEBS-based hot melt adhesive was applied, and the fabricated surface sheet and fabricated second sheet were partially fixed. The coating amount of the hot melt adhesive was 5 g / m 2.

EXAMPLE 2

The surface sheet used in Example 1 mentioned above was changed into the surface sheet produced as follows, and the absorbent sheet was used for the commercially available sanitary napkin (Lorie Super Slim Guard by Kao Corporation). The sanitary napkin of Example 2 was obtained in the same manner as in Example 1 except that creping was carried out in a wet state, and the wrinkles at 1 mm intervals were visually observed.

(Production of the surface sheet used for the sanitary napkin of Example 2)

A synthetic fiber made of a composite resin of polyethylene / polyethylene terephthalate having a fiber diameter of 4.4 dtex is passed through a carding machine to form a web, the web is introduced into a hot air spray device, and subjected to a hot air treatment by air through processing to obtain a surface sheet. Got. The pattern of the linear embossing 21 formed in 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 diameter distribution of the produced surface sheet was measured based on [the measuring method of the pore diameter distribution of a surface sheet] mentioned above, the pore capacity of the area | region with a pore diameter of 100 micrometers or less was 5% of the total pore capacity. In addition, the basis weight of the obtained surface sheet was 25 g / m <2>.

[Comparative Example 1]

The 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.

(Production of the surface sheet used for the sanitary napkin of the comparative example 1)

A synthetic sheet made of a composite resin of polyethylene / polyethylene terephthalate having a fiber diameter of 2.2 dtex is passed through a carding machine to form a web, the web is introduced into a hot air spray device, and subjected to a hot air treatment by air through processing to obtain a surface sheet. Got. The linear sheet | seat emboss 21 was not formed in the obtained surface sheet, Instead, the some three-dimensional opening was formed. The opening area ratio of the three-dimensional opening was 6%, and the formation pitch of the three-dimensional opening was 2 mm. When the pore diameter distribution of the produced surface sheet was measured based on [the measuring method of the pore diameter distribution of a surface sheet] mentioned above, the pore capacity of the area | region with a pore diameter of 100 micrometers or less was 35% of the total pore capacity. In addition, the basis weight of the obtained surface sheet was 25 g / m <2>.

[Comparative Example 2]

The surface sheet used in Example 1 mentioned above was changed to the surface sheet of basis weight 30g / m <2> from the basis weight 25g / m <2>, and was not carried out similarly to Example 1 mentioned above except not using the second sheet used in Example 1. To obtain a sanitary napkin of Comparative Example 2. When the pore diameter distribution of the produced surface sheet was measured based on [the measuring method of the pore diameter distribution of a surface sheet] mentioned above, the pore capacity of the area | region with a pore diameter of 100 micrometers or less was 8% of the total pore capacity.

〔evaluation〕

The following evaluation was performed using each sanitary napkin, and the result was shown in Table 1.

The diffusion area of a surface sheet and an absorber was measured based on the above-mentioned [measurement method of liquid diffusivity].

[The amount of liquid remaining of surface sheet]

The measurement is carried out under these temperature and humidity conditions using an absorbent article (physiological zone 1) that has been left for 1 day or more under 20 ° C and 65% RH environment.

The sanitary napkin 1 is arranged horizontally, an acrylic plate injector (having a hole of 10 mm in diameter) is placed thereon, and a load of 5 g / cm 2 is applied to defiber bleeding (manufactured by Nippon BioTest Co., Ltd.). After 3 g of dropping, after 3 g of de-fiber hemorrhage (manufactured by Nippon Biotest Co., Ltd.) was added dropwise from the same position three minutes later, the surface sheet was taken out of the sanitary napkin, and the weight of the surface sheet before and after the injection was measured. The weight of the defiber bleeding remaining in the sheet was measured to set the remaining amount of the liquid on the surface sheet.

[Absorption time of body fluids]

The measurement is carried out under these temperature and humidity conditions using an absorbent article (physiological zone 1) that has been left for 1 day or more under 20 ° C and 65% RH environment.

The sanitary napkin 1 is placed horizontally, and an acrylic plate injector (having a hole of 10 mm in diameter) is placed thereon, and a load of 5 g / cm 2 is applied thereto to give 3 g of horse blood (manufactured by Nippon Biotest Co., Ltd.). After dropping, 3 g of horse blood (manufactured by Nippon Biotest Co., Ltd.) was added dropwise from the same position three minutes later, and visually, the time until the transfer of blood from the surface sheet to the absorber completely was measured and the sanitary napkin It was set as the absorption time of the body fluid.

unit Example 1 Example 2 Comparative Example 1 Comparative Example 2 Diffusion Area of Surface Sheet ㎠ 15 14 21 18 Diffusion area of absorber ㎠ 30 30 30 30 Diffusion area of absorber /
Diffusion Area of Surface Sheet ship 2 2.12 1.42 1.55 Amount of liquid mg
250 220 320 370 Absorption time second 45 40 80 52

From the results shown in Table 1, the samples of Examples 1 and 2 had a smaller diffusion area of the surface sheet and less liquid remaining of the surface sheet than the samples of Comparative Examples 1 and 2, respectively. Able to know. In addition, it can be seen that the samples of Examples 1 and 2 also have shorter absorption times of body fluids, compared to the samples of Comparative Examples 1 and 2.

According to the absorbent article of the present invention, it is difficult for the body fluid to spread from the surface, and it is possible to reduce the fluid remaining of the body fluids other than the absorber and to shorten the transition time of the body fluid to the absorber.

Claims (4)

An absorbent article comprising a surface sheet disposed on the skin contacting surface side, a back sheet disposed on the skin non-contacting surface side, an absorber disposed between these sheets, and a second sheet disposed between the absorber and the surface sheet,
The surface sheet and the second sheet are partially fixed,
The surface sheet has a plurality of partition regions partitioned by linear embossing, and in the measurement of the pore diameter distribution having a pore diameter of 1 to 600 µm by a mercury porosimeter, an area having a pore diameter of 100 µm or less Pore capacity of the sheet is 10% or less of the total pore capacity,
The said second sheet is an absorbent article whose constituent fiber is a synthetic fiber, whose thickness is 0.15-0.4 mm, and whose liquid retention amount is 60 g / m <2> or less. The method of claim 1,
The absorbent article is a multi-pleated absorbent sheet, wherein the absorbent sheet and the second sheet are partially fixed to each other. The method according to claim 1 or 2,
The surface sheet has a constituent fiber comprises a heat elongation fiber,
In the said partition area | region, the absorbent article of the said thermally stretchable fiber is extended | stretched in the length of the thermally stretched fiber, and the mutual intersection of the mutually extended thermally stretched fibers is joined by heat fusion. 4. The method according to any one of claims 1 to 3,
The absorbent article according to the present invention, wherein the liquid diffusion area of the absorber is 1.6 times or more the liquid diffusion area of the surface sheet in the absorbent article state.

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