Absorbent articles

Abstract

To provide an absorbent article which has high breathability when worn and is less likely to become stuffy due to water vapor. [Solution] The absorbent article 10 has an absorbent core 13, a skin-side sheet located closer to the skin than the absorbent core 13, and a non-skin-side sheet consisting of one or more sheets located closer to the skin than the absorbent core 13. All of the sheet materials constituting the non-skin-side sheet are made of fiber sheets. The absorbent core 13 is provided with slit-shaped openings 14 that run through the absorbent core 13 in the thickness direction. It is preferable that the total opening area of ​​the slit-shaped openings 14 in a plan view of the absorbent core 13 is 5% to 30% of the apparent area of ​​the absorbent core 13.

Description

[Technical field]

[0001] The present invention relates to absorbent articles. [Background technology]

[0002] In absorbent articles such as diapers and napkins, liquid-impermeable films and films with moisture permeability (hereinafter also referred to as "moisture permeable films") are used as barrier materials against body fluids such as urine and blood. In absorbent articles having a moisture permeable film as a back sheet of the absorbent article, sweat generated from the wearer's body and water vapor generated from excreted liquid absorbed in the absorbent are easily released to the outside through the back sheet when the article is worn, so that there is an advantage that stuffiness caused by water vapor is unlikely to occur when the article is worn.

[0003] In recent years, nonwoven fabrics that are poorly permeable to liquids have been proposed as backsheets in place of moisture-permeable films. Backsheets made of nonwoven fabrics have higher moisture permeability than moisture-permeable films, so that stuffiness caused by water vapor is less likely to occur when the absorbent article is worn.

[0004] For example, Patent Document 1 proposes a nonwoven fabric backsheet formed by meltblowing. This nonwoven fabric backsheet has a mass of about 3 g / m 2 ~about 60g / m 2 and has a basis weight of at least about 15 cm 3 / cm 2 / sec. In addition, this nonwoven fabric backsheet is made of fine fibers with an average fiber diameter of about 3 μm to about 10 μm. Patent Document 2 proposes using a meltblown nonwoven fabric as a back sheet, which is composed of a fiber aggregate made of fibers having an average fiber diameter of less than 1.5 μm and which contains a polyolefin such as polypropylene as a main component and a silicone compound. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2003-527892 [Patent Document 2] JP 2017-089070 A Summary of the Invention [Problem to be solved by the invention]

[0006] Using a nonwoven fabric as the back sheet of an absorbent article has the advantage of making it less likely for stuffiness caused by water vapor to occur when the absorbent article is worn, but there is a demand for even greater prevention of stuffiness in order to prevent skin rashes and ensure a comfortable fit. Therefore, an object of the present invention is to provide an absorbent article which prevents the occurrence of stuffiness when worn more effectively than conventional absorbent articles. [Means for solving the problem]

[0007] The present invention relates to a diaper absorbing device having an absorbent core, a skin-side sheet located closer to the skin than the absorbent core, and a non-skin-side sheet consisting of one or more sheets located closer to the skin than the absorbent core, The sheet materials constituting the non-skin side sheet are all made of fiber sheets, The absorbent article further comprises an absorbent core having a slit-shaped opening penetrating the absorbent core in the thickness direction. Effect of the Invention

[0008] According to the present invention, an absorbent article is provided which is highly breathable when worn and is less likely to become stuffy due to water vapor. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a partially cutaway plan view showing one embodiment of an absorbent article according to the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on preferred embodiments with reference to the drawings. Figures 1 and 2 show an embodiment of an absorbent article according to the present invention. 1 and 2 has an elongated shape with a longitudinal direction X corresponding to a direction extending from the wearer's ventral side through the crotch region to the dorsal side, and a transverse direction Y perpendicular to the longitudinal direction X. The absorbent article 10 has a crotch portion disposed in the crotch region of the wearer, and a ventral side portion and a dorsal side portion extending in front of and behind the crotch portion. The crotch portion has an excretory part facing portion disposed facing the excretory part of the wearer when the absorbent article 10 is worn, and the excretory part facing portion is usually located in the longitudinal center of the absorbent article or in the vicinity thereof.

[0011] The absorbent article 10 has an absorbent core 13, a skin-side sheet 11 located closer to the skin than the absorbent core 13, and a non-skin-side sheet 12 located closer to the skin than the absorbent core 13. In this specification, the "skin side" refers to the side that faces the wearer's body when the absorbent article is worn. The "non-skin side" refers to the side that is opposite the skin side across the absorbent core when the absorbent article is worn.

[0012] The skin side sheet 11 is a general term for all sheet materials located closer to the skin than the absorbent core 13. The skin side sheet 11 is composed of a single sheet material or a laminate of multiple sheet materials. In either case, each sheet material is preferably composed of a fibrous sheet, and the skin side sheet 11 is preferably liquid permeable as a whole. As long as the skin side sheet 11 is liquid permeable as a whole, it is permissible for some of the sheet materials constituting the skin side sheet 11 to contain sheet materials other than fibrous sheets, for example, perforated films.

[0013] The non-skin side sheet 12 is a general term for all sheet materials located on the non-skin side of the absorbent core 13. Like the skin side sheet 11, the non-skin side sheet 12 is composed of a single sheet material or a laminate of multiple sheet materials. In either case, each sheet material is preferably composed of a fiber sheet, and the non-skin side sheet 12 is preferably breathable as a whole. In particular, from the viewpoint of effectively suppressing the occurrence of stuffiness when the absorbent article 10 is worn, it is preferable that the sheet materials constituting the non-skin side sheet 12 not include a liquid-impermeable film.

[0014] When the entire absorbent core 13 is covered with a core wrap sheet material (not shown), the sheet material constituting the skin side sheet 11 may be two sheets: a portion of the core wrap sheet material located on the skin side of the absorbent core 13 (hereinafter, this portion will be referred to as the "skin side first sheet material"), and a skin side second sheet material located further on the skin side than the skin side first sheet material and which is in contact with the wearer's body when the absorbent article 10 is worn. In other words, the skin side sheet 11 may be composed of a laminated structure of the skin side first sheet material and the skin side second sheet material. The two sheet materials are simply overlapped with each other, or are partially joined together.

[0015] When the skin-side sheet 11 is composed of a laminated structure of a first skin-side sheet material and a second skin-side sheet material, the second skin-side sheet material, which is the sheet material located closest to the skin-facing side of the wearer when the absorbent article 10 is worn, is generally called a top sheet. As the top sheet, a liquid-permeable sheet, such as a nonwoven fabric or a perforated film, can be used. The skin-facing side of the top sheet may have an uneven shape. For example, a plurality of convex portions can be formed in a scattered pattern on the skin-facing side of the top sheet. Alternatively, ridges and grooves extending in one direction can be formed alternately on the skin-facing side of the top sheet. For such a purpose, the top sheet can be formed using two or more sheets of nonwoven fabric.

[0016] On the other hand, when the entire absorbent core 13 is covered with a core wrap sheet material (not shown), the sheet material constituting the non-skin side sheet 12 may be two sheets: a portion of the core wrap sheet material located on the non-skin side of the absorbent core 13 (hereinafter, this portion will be referred to as the "non-skin side first sheet material"), and a non-skin side second sheet material which is located further on the non-skin side than the non-skin side first sheet material and faces outward when the absorbent article 10 is worn. In other words, the non-skin side sheet 12 may be composed of a laminated structure of the non-skin side first sheet material and the non-skin side second sheet material. The two sheet materials are simply overlapped with each other, or are partially joined together.

[0017] When the non-skin side sheet 12 is constructed from a laminated structure of a first non-skin side sheet material and a second non-skin side sheet material, the second non-skin side sheet material, which is the sheet material located furthest from the wearer's skin when the absorbent article 10 is worn, is generally sometimes called a back sheet. Details of the back sheet will be described later.

[0018] The absorbent core 13 is composed of, for example, a pile of hydrophilic fibers such as cellulose including pulp, a mixed pile of the hydrophilic fibers and an absorbent polymer, a pile of absorbent polymers, a laminated structure in which an absorbent polymer is supported between two absorbent sheets, etc. As described above, at least the skin-facing surface of the absorbent core 13 may be covered with a liquid-permeable core wrap sheet material (not shown), or the entire surface including the skin-facing surface and the non-skin-facing surface may be covered with a core wrap sheet material (not shown). As the core wrap sheet material, for example, tissue paper made of hydrophilic fibers, liquid-permeable nonwoven fabric, etc. can be used.

[0019] In addition to the above-mentioned skin-side sheet 11, non-skin-side sheet 12, and absorbent core 13, the absorbent article 10 may be provided with leakage-preventing cuffs (not shown) extending along the longitudinal direction X on both sides of the skin-facing side along the longitudinal direction X, depending on the specific use of the absorbent article 10. The leakage-preventing cuffs generally have a base end and a free end. The leakage-preventing cuffs have a base end on the skin-facing side of the absorbent article 10 and stand up from the skin-facing side. The leakage-preventing cuffs are made of a liquid-resistant or water-repellent material and are breathable. An elastic member made of rubber thread or the like may be provided in a stretched state at or near the free end of the leakage-preventing cuff. When the absorbent article 10 is worn, the elastic member contracts, causing the leakage-preventing cuffs to stand up toward the wearer's body, effectively preventing liquid excreted on the skin-side sheet 11 from leaking outward in the lateral direction Y of the absorbent article 10 along the skin-side sheet 11.

[0020] The absorbent article 10 may further have an adhesive layer on the non-skin facing surface. The adhesive layer is used to fix the absorbent article 10 to underwear or another absorbent article when the absorbent article 10 is worn.

[0021] Examples of absorbent articles having the above-mentioned configuration include, but are not limited to, flat-type disposable diapers, pants-type disposable diapers, sanitary napkins, incontinence pads, and auxiliary pads attached to the inside of disposable diapers.

[0022] 1 and 2, the absorbent core 13 has a pair of side edges 13a, 13a extending in the longitudinal direction X, and a pair of end edges 13b, 13b extending in the transverse direction Y. The side edge 13a is straight, and both side edges 13a, 13a extend parallel to each other. The absorbent core 13 is provided with a slit-shaped opening 14 penetrating the absorbent core 13 in the thickness direction Z. The opening 14 has a shape that is long in one direction. In the embodiment shown in Fig. 1 and Fig. 2, the opening 14 has a long and narrow rectangular shape extending along the horizontal direction Y. A plurality of openings 14 are formed at intervals in the vertical direction X in a region from one end to the other end in the vertical direction. By providing the openings 14 penetrating the absorbent core 13, a synergistic effect with the back sheet described below is achieved, and the absorbent article 10 of this embodiment has high breathability when worn, making it less likely to become stuffy due to water vapor. This will be described in more detail below.

[0023] In order to further suppress the occurrence of stuffiness caused by water vapor when the absorbent article 10 is worn, it is preferable that the sum of the opening areas of the slit-shaped openings 14 in a planar view of the absorbent core 13 is 5% or more of the apparent area of ​​the absorbent core (hereinafter, this value is also referred to as the "opening rate"). Furthermore, from the viewpoint of allowing the absorbent core 13 to absorb and retain a sufficient amount of liquid and ensuring the shape retention of the absorbent core 13, it is preferable that the opening rate of the opening 14 is 30% or less, more preferably 20% or less, and even more preferably 10% or less. Considering all of the above, the opening ratio of the opening 14 is preferably 5% to 30%, more preferably 5% to 20%, and even more preferably 5% to 10%.

[0024] The opening ratio of the openings 14 is as described above, and the area of ​​each opening 14 may be appropriately set according to the specific application of the absorbent article 10. When the absorbent article 10 is, for example, a disposable diaper for babies, the area of ​​each opening 14 is independently set to 1 cm 2 More than 30cm 2 Preferably less than 3cm 2 More than 20cm 2 More preferably, it is 5 cm or less. 2 More than 10cm 2 It is even more preferable that the area of ​​each opening 14 is set in this manner. By setting the area of ​​each opening 14 in this manner, it is possible to allow the absorbent core 13 to absorb and retain a sufficient amount of liquid, while further suppressing the occurrence of stuffiness caused by water vapor when the absorbent article 10 is worn.

[0025] As described above, it is desirable for opening 14 to have a slit-like shape that is long in one direction, i.e., an anisotropic shape. When opening 14 has such an anisotropic shape, the flexibility of absorbent core 13 is improved, and the absorbent article 10 fits well to the wearer's body when worn, which is advantageous in reducing leakage. In order to make this advantage more pronounced, when the length of the slit-like opening 14 in the longitudinal direction is a and the length in the lateral direction perpendicular to the longitudinal direction is b, the value of a / b is preferably 1.5 or more and 15 or less, more preferably 3 or more and 12 or less, and even more preferably 5 or more and 10 or less.

[0026] When the absorbent core 13 is a mixed laminate of hydrophilic fibers such as pulp and a hydrogel material such as an absorbent polymer, the basis weight of the absorbent core 13 is set to 200 g / m excluding the openings from the viewpoint of further suppressing the occurrence of stuffiness caused by water vapor when the absorbent article 10 is worn and from the viewpoint of allowing the absorbent core 13 to absorb and retain a sufficient amount of liquid. 2 More preferably, it is 300 g / m or more. 2 More preferably, it is 400 g / m or more. 2 More preferably, the above is the case.

[0027] A non-skin side sheet 12 is disposed on the non-skin facing surface side of the absorbent core 13. As described above, at least one of the sheet materials constituting the non-skin side sheet 12 is generally called a back sheet. In this embodiment, the back sheet is made of a fiber sheet, and in particular, of a nonwoven fabric. Due to the synergistic effect of making the back sheet of a nonwoven fabric and providing the above-mentioned openings 14 in the absorbent core 13, the absorbent article 10 of this embodiment has higher breathability when worn, and is less susceptible to stuffiness caused by water vapor. Up until now, the technology of using nonwoven fabric as the back sheet of an absorbent article has been known. By using nonwoven fabric as the back sheet, water vapor permeability is increased compared to the case of using a moisture-permeable film, and the occurrence of stuffiness when the absorbent article is worn is suppressed. When the present inventor further investigated absorbent articles using nonwoven fabric as the back sheet, it was found that by providing openings 14 in the absorbent core 13, the flow of water vapor generated due to the evaporation of liquid held in the absorbent core 13 becomes smoother, and the dissipation of water vapor through the back sheet made of nonwoven fabric is further promoted. The absolute humidity value calculated by the present inventor from clothing science literature is 28.3 g / m 3 from 32.8 g / m 3 Up to 23.7 g / m is classified as "uncomfortable zone". 3 from 28.3 g / m 3 In the absorbent article having a moisture-permeable film as a back sheet, which has been conventionally used in the technical field, the absolute humidity value is 29.5 g / m 3 and the absolute humidity value was 28.9 g / m for an absorbent article having a nonwoven fabric as a backsheet. 3 In contrast, the absolute humidity value of the absorbent article 10 of the present embodiment was 27.1 g / m 3 from 27.8 g / m 3 In other words, the stuffiness when worn has been reduced, making it possible to achieve a more comfortable zone than the "uncomfortable zone." From the above viewpoints, it is preferable that the back sheet does not include a film layer such as a moisture-permeable film, and is preferably composed only of a nonwoven fabric.

[0028] Increasing the breathability of the nonwoven fabric used as the non-skin side sheet 12 including the backsheet can make the absorbent article 10 more comfortable to wear. However, the non-skin side sheet 12 including the backsheet is also required to have the function of preventing leakage of liquid held in the absorbent core 13, and from this viewpoint, it is desirable for the nonwoven fabric to have low liquid permeability. The breathability and liquid blocking properties of the nonwoven fabric depend mainly on the basis weight of the nonwoven fabric and the thickness of the fibers constituting the nonwoven fabric.

[0029] The nonwoven fabric used as the back sheet is preferably composed only of meltblown nonwoven fabric, or a nonwoven fabric containing meltblown nonwoven fabric, such as SM nonwoven fabric (meltblown-spunbond composite nonwoven fabric), SMS nonwoven fabric (spunbond-meltblown-spunbond composite nonwoven fabric), SMMS nonwoven fabric (spunbond-meltblown-meltblown-spunbond composite nonwoven fabric), or the like.

[0030] The meltblown nonwoven fabric has high liquid blocking properties due to the small fiber diameter of its constituent fibers caused by its manufacturing method. The fiber diameter of the constituent fibers of the meltblown nonwoven fabric is preferably 0.1 μm to 10 μm, more preferably 0.3 μm to 7 μm, and even more preferably 0.5 μm to 5 μm.

[0031] The fiber diameter of the constituent fibers of the meltblown nonwoven fabric is measured by the following method. A small sample is taken from the meltblown nonwoven fabric, and the sample is subjected to gold vapor deposition for 2 minutes. Then, using a scanning electron microscope, the fiber diameter of 70 randomly selected fibers is measured directly. The average value of the measured values ​​(two significant figures) is taken as the fiber diameter of the constituent fibers of the meltblown nonwoven fabric. When the back sheet is composed of a nonwoven fabric including a meltblown nonwoven fabric such as an SM nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric, the small sample is taken at a stage during the production of the nonwoven fabric where it can be taken from the meltblown nonwoven fabric. Alternatively, if possible, the surface of the SMS nonwoven fabric or the like may be observed with a scanning electron microscope, and the fiber diameter of the meltblown nonwoven fabric may be measured by directly observing the fibers.

[0032] Whether the nonwoven fabric constituting the backsheet is composed of only meltblown nonwoven fabric or is composed of a nonwoven fabric containing meltblown nonwoven fabric such as SM nonwoven fabric, SMS nonwoven fabric, or SMMS nonwoven fabric, the basis weight of the meltblown nonwoven fabric is set to 1 g / m2 from the viewpoint of achieving a balance between breathability and liquid blocking properties. 2 It is preferable that the content is 5 g / m or more. 2 More preferably, it is 10 g / m or more. 2From the same viewpoint, the basis weight of the meltblown nonwoven fabric is more preferably 50 g / m or more. 2 Preferably, it is 35 g / m or less. 2 More preferably, it is 20 g / m or less. 2 It is even more preferable that: To summarize the above, the basis weight of meltblown nonwoven fabric is 1g / m 2 More than 50g / m 2 It is preferable that the thickness is less than 5 g / m 2 More than 35g / m 2 More preferably, it is 10 g / m or less. 2 More than 20g / m 2 It is even more preferable that:

[0033] The basis weight of the meltblown nonwoven fabric is calculated by dividing the average mass measured on at least five 10 mm square test pieces taken from the nonwoven fabric by the area of ​​the test pieces. When the backsheet is composed of a nonwoven fabric including a meltblown nonwoven fabric such as an SM nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric, the basis weight of the meltblown nonwoven fabric may be measured by separating each layer by a means such as peeling.

[0034] The nonwoven fabric used as the backsheet (hereinafter also referred to as "nonwoven backsheet") broadly includes those manufactured by various methods. There are various known methods for manufacturing nonwoven fabrics, such as the meltblown method, spunbond method, air-through method, airlaid method, spunlace method, needle punch method, electrospinning method, chemical bond method, and thermal bond method, and the nonwoven backsheet includes those manufactured by these methods. However, the nonwoven backsheet is not limited to these, and nonwoven fabrics manufactured by other methods or nonwoven fabrics manufactured by any combination of these methods may be used. It is desirable for the nonwoven backsheet to have high barrier properties against liquids, and it is particularly advantageous for it to be a meltblown nonwoven fabric or a composite nonwoven fabric having a meltblown layer, which is a nonwoven fabric that is likely to exhibit this property. Examples of composite nonwoven fabrics having a meltblown layer include SM nonwoven fabrics and SMS nonwoven fabrics.

[0035] When the nonwoven fabric used as the backsheet has a laminated structure of multiple nonwoven fabrics, the laminated structure preferably includes at least a spunbond layer and a meltblown layer in order to achieve a balance between the breathability and liquid blocking properties of the nonwoven fabric. In other words, the nonwoven fabric is preferably the above-mentioned SM nonwoven fabric or SMS nonwoven fabric. In this case, the ratio of the mass of the spunbond layer to the mass of the nonwoven fabric is preferably 50% by mass or more and 95% by mass or less in order to achieve a high level of balance between the breathability and liquid blocking properties of the nonwoven fabric. From the same viewpoint, the ratio of the mass of the spunbond layer to the mass of the nonwoven fabric is more preferably 50% by mass or more and 90% by mass or less, and even more preferably 50% by mass or more and 85% by mass or less.

[0036] On the other hand, the ratio of the mass of the meltblown layer to the mass of the nonwoven fabric is preferably 5% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 50% by mass or less, and even more preferably 15% by mass or more and 50% by mass or less.

[0037] The nonwoven backsheet preferably contains fibers that contain a thermoplastic resin having fiber-forming ability and a triglyceride. While various thermoplastic resins having fiber-forming ability are known in the art, the present invention uses a polyolefin resin as the thermoplastic resin from the viewpoint of obtaining a nonwoven fabric with high barrier properties against liquids.

[0038] The polyolefin resin may be, for example, a homopolymer or copolymer of a lower olefin such as ethylene or propylene, etc. Specific examples include polyethylene, polypropylene, and ethylene-α-olefin copolymers. Examples of the polyethylene include high density polyethylene, low density polyethylene, and linear low density polyethylene. Examples of polypropylene include isotactic polypropylene and syndiotactic polypropylene. In addition, low stereoregular homopolypropylene can be used as the polypropylene. Low stereoregular homopolypropylene has the following properties, which are an index of stereoregularity: 13 This refers to homopolypropylene with a mesopentad fraction (mmmm [%]) of 90% or less as measured by C-NMR. Examples of the ethylene-α-olefin copolymer include copolymers of ethylene and α-olefins such as propylene, 1-butene, 1-pentene, and 1-hexene. Examples of the copolymer include random copolymers, block copolymers, and graft copolymers. In particular, it is preferable to use a random copolymer of ethylene and propylene (hereinafter also referred to as "random propylene copolymer"). Of these polyolefin resins, polypropylene and polyolefins containing propylene as a copolymerization component are preferably used from the viewpoints of high fiber-forming ability and high liquid barrier properties of the resulting nonwoven fabric. The polyolefin resin is also preferably a blend of homopolypropylene and a random propylene copolymer or a low stereoregular homopolypropylene.

[0039] The fibers constituting the nonwoven backsheet may contain only one type of the above-mentioned polyolefin resins, or may contain two or more types. The fibers constituting the nonwoven backsheet may contain only the above-mentioned polyolefin resin as the constituent resin, or may contain other thermoplastic resins in addition to the polyolefin resin. In the latter case, it is preferable that the constituent resin of the fibers contains 50% by mass or more of the above-mentioned polyolefin resin.

[0040] Triglyceride, another component contained in the fibers constituting the nonwoven backsheet, is used to reduce the surface tension of the fibers constituting the nonwoven fabric and increase the barrier properties of the nonwoven fabric against liquids. The triglyceride may be present in a state of being attached to the surface of the fibers, or may be present by being kneaded into the resin constituting the fibers.

[0041] As the triglyceride, a triglyceride derived from a saturated fatty acid, a triglyceride derived from an unsaturated fatty acid, or a triglyceride derived from a saturated fatty acid and an unsaturated fatty acid can be used. In any case, the number of carbon atoms of the fatty acid can be, for example, from 12 to 24. From the viewpoint of further improving the barrier property of the nonwoven fabric against liquids, the number of carbon atoms of the fatty acid is preferably from 14 to 22, and more preferably from 16 to 20. The triglyceride may be used alone or as a mixture of two or more types of triglycerides. The fibers constituting the nonwoven backsheet may contain only triglycerides as glycerides, or may contain monoglycerides and / or diglycerides in addition to triglycerides as long as the desired effects of the present invention are achieved. However, from the viewpoint of improving the barrier properties of the nonwoven backsheet against liquids, it is preferable to use only triglycerides as glycerides.

[0042] The triglyceride used in the present invention is preferably one in which the number of carbon atoms in the fatty acid residue is adjusted. By using such a triglyceride, the barrier property of the nonwoven backsheet against liquids can be improved. In detail, it is preferable to use the following (a) or (b) as the triglyceride. (a) A triglyceride comprising a mixture of a triglyceride containing at least one group derived from a fatty acid having 16 carbon atoms in one molecule and a triglyceride containing at least one group derived from a fatty acid having 18 carbon atoms in one molecule. (b) A triglyceride containing at least one group derived from a fatty acid having 16 carbon atoms and one group derived from a fatty acid having 18 carbon atoms in one molecule.

[0043] In the case of (a), two or more kinds of triglycerides are used. At least one of the kinds of triglycerides contains at least one group derived from a fatty acid having 16 carbon atoms (i.e., a saturated fatty acid or an unsaturated fatty acid) in one molecule (this triglyceride is also called "triglyceride 16"). It is preferable that triglyceride 16 contains at least one group derived from a fatty acid having 16 carbon atoms in one molecule. Triglyceride 16 may contain one group derived from a fatty acid having 16 carbon atoms in one molecule (this triglyceride is also called "triglyceride P"), two groups (this triglyceride is also called "triglyceride PP"), or three groups (this triglyceride is also called "triglyceride PPP"). The type of the remaining fatty acid residues in triglyceride P and triglyceride PP is not particularly limited, and may be, for example, a residue of a saturated fatty acid or an unsaturated fatty acid having 12 to 24 carbon atoms.

[0044] Triglyceride 16 may consist solely of triglyceride P, may consist solely of triglyceride PP, or may consist solely of triglyceride PPP. Triglyceride 16 may be a combination of two or more selected from triglyceride P, triglyceride PP, and triglyceride PPP. For example, triglyceride 16 may be a combination of triglyceride P and triglyceride PP, a combination of triglyceride P and triglyceride PPP, a combination of triglyceride PP and triglyceride PPP, or a combination of triglyceride P, triglyceride PP, and triglyceride PPP.

[0045] In the case of (a), at least one of the multiple triglycerides contains at least one group derived from a fatty acid having 18 carbon atoms (i.e., a saturated fatty acid or an unsaturated fatty acid) in one molecule (this triglyceride is also called "triglyceride 18"). It is preferable that triglyceride 18 contains at least one group derived from a fatty acid having 18 carbon atoms in one molecule. Triglyceride 18 may contain one group derived from a fatty acid having 18 carbon atoms in one molecule (this triglyceride is also called "triglyceride S"), two groups derived from a fatty acid having 18 carbon atoms in one molecule (this triglyceride is also called "triglyceride SS"), or three groups derived from a fatty acid having 18 carbon atoms in one molecule (this triglyceride is also called "triglyceride SSS"). The type of the remaining fatty acid residue in triglyceride S and triglyceride SS is not particularly limited, and may be, for example, a residue of a saturated fatty acid or an unsaturated fatty acid having 12 to 24 carbon atoms.

[0046] Triglyceride 18 may consist solely of S triglycerides, may consist solely of SS triglycerides, or may consist solely of SSS triglycerides. Triglyceride 18 may be a combination of two or more selected from triglyceride S, triglyceride SS, and triglyceride SSS. For example, triglyceride 18 may be a combination of triglyceride S and triglyceride SS, a combination of triglyceride S and triglyceride SSS, a combination of triglyceride SS and triglyceride SSS, or a combination of triglyceride S, triglyceride SS, and triglyceride SSS.

[0047] In the case of (a), the triglyceride may be composed only of triglyceride 16 and triglyceride 18, or may be composed of other triglycerides in addition to triglyceride 16 and triglyceride 18. The other triglycerides include triglycerides having neither a group derived from a fatty acid having 16 carbon atoms nor a group derived from a fatty acid having 18 carbon atoms.

[0048] If the group derived from a fatty acid having 16 carbon atoms is "P", the group derived from a fatty acid having 18 carbon atoms is "S", and the groups derived from the other fatty acids are "X" and "Y", the combination of groups derived from the fatty acids constituting the triglyceride is any one of PPP (i.e., triglyceride PPP), SSS (i.e., triglyceride SSS), PPX (i.e., triglyceride PP), SSX (i.e., triglyceride SS), PXY (i.e., triglyceride P), and SXY (i.e., triglyceride S). The structures of triglycerides represented by PPP, SSS, PPX, SSX, PXY, and SXY are (A) to (L) below.

[0049] [ka]

[0050] [ka]

[0051] [ka]

[0052] [ka]

[0053] [ka]

[0054] From the viewpoint of obtaining a nonwoven fabric with higher barrier properties against liquids, it is preferable to use a triglyceride composed only of triglycerides 16 and 18.

[0055] In the case of (b), at least one kind of triglyceride can be used. This triglyceride contains at least one group derived from a fatty acid having 16 carbon atoms (i.e., saturated fatty acid or unsaturated fatty acid) and at least one group derived from a fatty acid having 18 carbon atoms (i.e., saturated fatty acid or unsaturated fatty acid) in one molecule. In particular, it is preferable for the triglyceride to contain at least one group derived from a saturated fatty acid having 16 carbon atoms and at least one group derived from a saturated fatty acid having 18 carbon atoms in one molecule, in that a nonwoven fabric with higher barrier properties against liquids can be obtained.

[0056] In the case of (b), if the group derived from a fatty acid with 16 carbon atoms is "P", the group derived from a fatty acid with 18 carbon atoms is "S", and the group derived from any other fatty acid is "X", the combination of aliphatic groups constituting the triglyceride is either SSP, SPP, or SPX. The structure of the triglyceride represented by SPX is either (M) or (O) below. The same applies to SSP and SPP.

[0057] [ka]

[0058] In the case of (b), the triglyceride may be composed only of triglycerides containing at least one group derived from a fatty acid having 16 carbon atoms and at least one group derived from a fatty acid having 18 carbon atoms in one molecule. Alternatively, the triglyceride may be composed of a triglyceride containing at least one group derived from a fatty acid having 16 carbon atoms and at least one group derived from a fatty acid having 18 carbon atoms, and other glycerides. Examples of other triglycerides include triglycerides that have neither a group derived from a fatty acid having 16 carbon atoms nor a group derived from a fatty acid having 18 carbon atoms in one molecule. From the viewpoint of obtaining a nonwoven fabric with higher barrier properties against liquids, it is preferable to use only triglycerides that contain at least one group derived from a fatty acid having 16 carbon atoms and at least one group derived from a fatty acid having 18 carbon atoms in one molecule.

[0059] In the present invention, a combination of (a) and (b) can also be used. Specifically, a combination of triglyceride PPP, triglyceride SSS, and SPX can be used. Alternatively, a combination of triglyceride PPP, triglyceride SSS, and SSP, or a combination of triglyceride PPP, triglyceride SSS, and SPP can also be used. Furthermore, a combination of triglyceride PPX, triglyceride SSX, and triglyceride SPX, a combination of triglyceride PPX, triglyceride SSX, and triglyceride SSP, a combination of triglyceride PPX, triglyceride SSX, and triglyceride SPP, a combination of triglyceride PXY, triglyceride SXY, and triglyceride SPX, a combination of triglyceride PXY, triglyceride SXY, and triglyceride SSP, and a combination of triglyceride PXY, triglyceride SXY, and triglyceride SPP can also be used.

[0060] In either case of (a) or (b) above, it is preferable that the triglyceride used in the present invention does not contain a group derived from an unsaturated fatty acid, from the viewpoint of increasing the barrier property of the nonwoven backsheet against liquids. "Does not contain a group derived from an unsaturated fatty acid" includes both a case where no group derived from an unsaturated fatty acid is contained at all, and a case where a small amount of unsaturated fatty acid is inevitably contained. An example of a case where a small amount of unsaturated fatty acid is contained unavoidably is a case where the proportion of groups derived from unsaturated fatty acid is 2% by mass or less, based on the total amount of groups derived from fatty acids contained in all triglycerides contained in the fiber.

[0061] In the present invention, it is preferable to adjust the proportion of groups derived from fatty acids having 16 carbon atoms and the proportion of groups derived from fatty acids having 18 carbon atoms for all triglycerides contained in the constituent fibers of the nonwoven backsheet, from the viewpoint of further improving the barrier properties of the nonwoven backsheet against liquids.

[0062] With regard to the proportion of groups derived from fatty acids having 16 carbon atoms, for all triglycerides contained in the constituent fibers of the nonwoven backsheet, it is preferable that the proportion be 1 mass% or more, based on the total amount of groups derived from fatty acids, from the viewpoint of further improving the barrier properties of the nonwoven fabric against liquids, and from the viewpoint of even further improving the barrier properties, it is more preferably 10 mass% or more, even more preferably 15 mass% or more, even more preferably 20 mass% or more, and particularly preferably 25 mass% or more. Furthermore, from the viewpoint of further improving the barrier properties of the nonwoven fabric against liquids, the ratio is preferably less than 55% by mass, and from the viewpoint of further improving the barrier properties, the ratio is more preferably 50% by mass or less, and even more preferably 45% by mass or less. The ratio is preferably 1% by mass or more and less than 55% by mass, more preferably 10% by mass or more and less than 55% by mass, even more preferably 15% by mass or more and less than 55% by mass, even more preferably 20% by mass or more and less than 50% by mass, and particularly preferably 25% by mass or more and less than 45% by mass.

[0063] The proportion of groups derived from fatty acids having 18 carbon atoms is preferably 5% by mass or more, based on the total amount of groups derived from fatty acids, for all triglycerides contained in the constituent fibers of the nonwoven fabric, from the viewpoint of further improving the barrier properties of the nonwoven fabric against liquids, and is more preferably 35% by mass or more, even more preferably 45% by mass or more, still more preferably 50% by mass or more, and particularly preferably 55% by mass or more, from the viewpoint of further improving the barrier properties. Furthermore, from the viewpoint of further improving the barrier properties of the nonwoven fabric against liquids, the above ratio is preferably less than 90% by mass, and from the viewpoint of further improving the barrier properties, the ratio is preferably 70% by mass or less, and more preferably 65% ​​by mass or less. The ratio is preferably 5% by mass or more and less than 90% by mass, more preferably 35% by mass or more and less than 90% by mass, even more preferably 45% by mass or more and less than 90% by mass, even more preferably 50% by mass or more and 70% by mass or less, and even more preferably 55% by mass or more and 65% by mass or less.

[0064] With regard to the ratio of groups derived from fatty acids having 16 carbon atoms to groups derived from fatty acids having 18 carbon atoms, the mass ratio (C18 / C16) of the groups derived from fatty acids having 18 carbon atoms to the groups derived from fatty acids having 16 carbon atoms contained in all triglycerides contained in the fiber is preferably 1.0 to 15.0 in order to further improve the barrier properties of the nonwoven fabric against liquids. From the viewpoint of making this advantage more prominent, the mass ratio (C18 / C16) of the groups derived from fatty acids having 18 carbon atoms to the groups derived from fatty acids having 16 carbon atoms is more preferably 1.2 to 10.0, even more preferably 1.3 to 5.0, and even more preferably 1.3 to 2.7.

[0065] The respective proportions of groups derived from fatty acids having 16 carbon atoms and groups derived from fatty acids having 18 carbon atoms, based on the total amount of groups derived from fatty acids contained in all triglycerides contained in the fiber, are measured by the following method. The triglycerides present on the surface of the fibers constituting the nonwoven fabric are extracted using a good solvent for triglycerides, such as toluene. The ester bonds in the extracted triglycerides are hydrolyzed with alkali, and the methyl-esterified fatty acids are quantitatively analyzed by gas chromatography.

[0066] The presence of alkyl chains with different carbon numbers in one molecule of triglyceride can be determined by TOF-MS (time of flight mass spectrometry). In detail, the molecular weight distribution of triglyceride is measured by TOF-MS, and it is determined from the molecular weight of one molecule whether or not the molecule contains alkyl groups with different carbon numbers. The presence of alkyl chains with different carbon numbers in one molecule of a compound with the same molecular weight can be determined by using a tandem mass spectrometer (MS / MS) as a mass spectrometer. A specific ion is selected in the first mass separation section, and the fragment ions generated by colliding with an inert gas are separated and detected in the second mass separation section to determine the presence of alkyl chains with different carbon numbers in one molecule.

[0067] In the nonwoven backsheet used in the present invention, the triglyceride satisfying the above-mentioned (a) and / or the triglyceride satisfying (b) is preferably contained in an amount of 1% by mass or more relative to the fibers containing triglycerides, from the viewpoint of further improving the barrier property of the nonwoven backsheet against liquids, and from the viewpoint of still further improving the barrier property, the amount is preferably 2% by mass or more, and even more preferably 3% by mass or more. The ratio of the triglyceride to the fibers containing the triglyceride is preferably 30% by mass or less from the viewpoints of improving spinnability and improving the texture of the nonwoven back sheet, more preferably 20% by mass or less, and even more preferably 15% by mass or less. The proportion of the triglyceride in the triglyceride-containing fiber is preferably 1% by mass or more and less than 30% by mass, more preferably 2% by mass or more and 20% by mass or less, and even more preferably 3% by mass or more and 15% by mass or less.

[0068] One example of a method for incorporating triglyceride into the fibers constituting the nonwoven backsheet is to melt-knead the thermoplastic resin constituting the fibers with triglyceride to knead the triglyceride into the thermoplastic resin, although the method is not limited to this and other methods may be used to incorporate triglyceride into the fibers.

[0069] The nonwoven backsheet may be composed of only the fibers containing the polyolefin resin and the triglyceride described above, or may be composed of the fibers and other fibers. In the latter case, the nonwoven backsheet may be composed of a blend of the fibers and other fibers, or may be composed of a laminate of a layer containing only the fibers and a layer containing only the other fibers. For example, the nonwoven backsheet may be composed of a laminate of a meltblown layer containing only the fibers and a spunbond layer disposed on each side of the meltblown layer and containing only the other fibers. When the nonwoven backsheet is composed of the fibers and other fibers, the proportion of the fibers in the nonwoven backsheet is preferably 3% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more, from the viewpoint of enhancing the barrier property of the nonwoven fabric against liquids, regardless of the form of the nonwoven backsheet.

[0070] Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, when a core wrap sheet material for covering the absorbent core 13 is arranged on the surface of the absorbent core 13, an opening having the same shape and dimensions as the opening 14 provided in the absorbent core 13 may be provided in the core wrap sheet material at a position corresponding to the opening 14 provided in the absorbent core 13.

[0071] In addition, the shape and arrangement of the openings 14 provided in the absorbent core 13 are not limited to those shown in Figures 1 and 2. For example, they may have any shape, such as an isotropic shape, a circle, a star, or a heart, and they do not have to be arranged at equal intervals, but may be concentrated in the urination area. EXAMPLES

[0072] The present invention will be described in more detail below with reference to examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, "%" means "% by mass".

[0073] Example 1 (1) Masterbatch manufacturing The propylene homopolymer (HP461Y, manufactured by Lyondelbasel, hereinafter referred to as "homo PP") and triglyceride were weighed out so that the mass ratio was 90 / 10, and then charged into a twin-screw extruder (manufactured by Toyo Seiki Seisakusho) and kneaded to prepare a master batch. As the triglyceride, extremely hardened palm oil (manufactured by Ueda Oil Mills, Ltd.) was used. This triglyceride was a mixture of multiple triglycerides, each of which had a group derived from saturated fatty acids with different carbon numbers. In this triglyceride, the proportion of groups derived from C14 saturated fatty acids was 1%, the proportion of groups derived from C16 saturated fatty acids was 42%, and the proportion of groups derived from C18 saturated fatty acids was 57%. (2) Manufacturing of meltblown nonwoven fabrics A meltblown nonwoven fabric was produced using the masterbatch thus obtained as a raw material. The basis weight of the meltblown nonwoven fabric thus obtained was 15 g / m 2 The fiber diameter of the constituent fibers was 0.7 μm. The basis weight of the nonwoven fabric was determined by dividing the average mass measured for ten 16 cm × 16 cm measurement pieces randomly taken from the nonwoven fabric by 0.0256. (3) Manufacturing of nonwoven backsheets Each side of this meltblown nonwoven fabric has a basis weight of 9 g / m 2 The spunbond nonwoven fabrics are laminated and integrated to form a three-layer structure with a basis weight of 33 g / m 2 The SMS nonwoven fabric was obtained. The spunbond nonwoven fabric was composed of PP fibers with a fiber diameter of 20 μm. This SMS nonwoven fabric was used as the back sheet. (4) Manufacture of absorbent articles The absorbent core shown below was manufactured using a mixed stack consisting of flap pulp and particles of absorbent polymer made of cross-linked acrylate. The dimensions of the absorbent core were 10 cm long and 10 cm wide, which are suitable dimensions for measuring the humidity inside the product. The basis weight of the absorbent core was 350 g / m2 of pulp. 2 Polymer 140g / m 2 Total of 490g / m 2 A rectangular opening measuring 1 cm in length and 8 cm in width was formed in the center of this absorbent core. The opening rate was 8%. An absorbent core was placed on top of a back sheet (non-skin side sheet) made of the SMS nonwoven fabric obtained in (3) above, and a top sheet (skin side sheet) made of an air-through nonwoven fabric was placed on top of that. The top sheet extending from the periphery of the absorbent core was joined to the back sheet, thereby obtaining a model absorbent article with dimensions suitable for measuring humidity inside the article.

[0074] Example 2 An absorbent article was obtained in the same manner as in Example 1, except that no triglyceride was blended into the constituent fibers of the meltblown nonwoven fabric in the SMS nonwoven fabric constituting the backsheet in Example 1.

[0075] Example 3 In Example 1, triglyceride was not blended into the constituent fibers of the meltblown nonwoven fabric in the SMS nonwoven fabric constituting the back sheet. Two rectangular openings were formed in the center of the absorbent core. The spacing between the openings was 5 cm. Except for these, an absorbent article was obtained in the same manner as in Example 1. The opening ratio was 16%.

[0076] Example 4 In Example 1, triglyceride was not blended into the constituent fibers of the meltblown nonwoven fabric in the SMS nonwoven fabric constituting the back sheet. Three rectangular openings were formed in the center of the absorbent core. The spacing between the openings was 2 cm. Except for these, an absorbent article was obtained in the same manner as in Example 1. The opening ratio was 24%.

[0077] Comparative Example 1 In Example 1, a porous moisture-permeable film made of polyethylene resin was used as the back sheet, and no openings were provided in the absorbent core. Except for these, an absorbent article was obtained in the same manner as in Example 1.

[0078] Comparative Example 2 In Example 1, a porous moisture-permeable film made of polyethylene resin was used as the back sheet. Also, three openings were formed in the center of the absorbent core. Except for this, an absorbent article was obtained in the same manner as in Example 1.

[0079] Comparative Example 3 In Example 1, triglyceride was not blended into the constituent fibers of the meltblown nonwoven fabric in the SMS nonwoven fabric constituting the backsheet. Also, no openings were provided in the absorbent core. Except for these, an absorbent article was obtained in the same manner as in Example 1.

[0080] 〔evaluation〕 The absorbent articles obtained in the Examples and Comparative Examples were measured for the humidity inside the article and the amount of liquid returning by the following methods. Furthermore, the seepage prevention property was evaluated. The results are shown in Table 1.

[0081] [Humidity inside the product] The heating plate of KESF7 (precision and rapid thermal property measuring device) manufactured by Kato Tech was heated to 33°C. Laurier Slim Guard Night Use (registered trademark, manufactured by Kao Corporation) injected with 10 g of physiological saline was placed on the heating plate with the top sheet facing upward, and was allowed to acclimate for about 1 hour so that the amount of water evaporation from Laurier Slim Guard became approximately constant. After acclimatization, a moisture-permeable film separated from Merrys (registered trademark, manufactured by Kao Corporation), Hygroclone (wireless data logger manufactured by KN Laboratories), absorbent articles of Examples and Comparative Examples injected with 65 g of artificial urine (top sheet facing downward), and Relief Anshin Tape Type (registered trademark, manufactured by Kao Corporation, top sheet facing downward) were layered in this order. The temperature and humidity data after 20 minutes, captured by Hygroclone with weights fixed around the periphery to prevent gaps, were recorded as absolute humidity (g / m 3The value converted to the humidity inside the article when wet was taken as the humidity inside the article when dry. The measurement of the humidity inside the material when dry was carried out under the condition that no artificial urine was poured into the absorbent articles of the Examples and Comparative Examples.

[0082] [Amount of liquid returned] Sixteen sheets of filter paper 5C (diameter 160 mm) were prepared and their total mass was measured. 50 g of artificial urine was poured into the center of the absorbent article placed horizontally with the top sheet facing upward using a funnel. The pouring rate was 5 g / s. After pouring, the product was left for 2 minutes, and then a 10 cm x 10 cm acrylic plate was placed on the top sheet, and a 4.5 kg weight was placed on it and pressure was applied for 3 minutes. Then, the weight and acrylic plate were removed, and the liquid adhering to the acrylic plate was wiped off. 30 seconds after the removal, the 16 pieces of filter paper were placed on the top sheet, and the acrylic plate and weight were placed on it and pressure was applied for 2 minutes. Then, the filter paper, acrylic plate, and weight were removed, and the mass of the filter paper was measured again. The difference in the mass of the filter paper was calculated, and this value was taken as the amount of liquid return. The same procedure as above was repeated, but the amount of artificial urine injected was changed to 150 g, and the amount of return was measured.

[0083] [Anti-bleeding properties] The SMS nonwoven fabrics and moisture-permeable films used in the manufacture of the absorbent articles of the Examples and Comparative Examples were evaluated for their ability to prevent liquid seepage by the following method. An SMS nonwoven fabric or moisture-permeable film cut to 8 cm x 8 cm was placed on a filter paper (No. 2, diameter 70 mm, manufactured by Advantec Toyo Co., Ltd.). A dry pulp sheet (Lead Healthy Cooking Paper Double (product name), basis weight 40 g / m, manufactured by Lion Corporation) was placed on the SMS nonwoven fabric or moisture-permeable film. 2 ) cut to a size of 8cm x 8cm was placed on the board. Three types of wetting tension test liquid (surface tension at 25℃: 35mN / m, 55mN / m, and 72mN / m) were poured into the center of the dry pulp sheet using a dropper. After the pouring, an acrylic plate with a diameter of 60mm was placed on top of the sheet, and a 2kg weight was placed on top of the plate to apply pressure for 1 hour. After one hour, the weight was removed and the degree of seepage of the liquid into the filter paper was visually observed to determine whether or not there was any seepage. This evaluation was performed three times for each level, and the degree of seepage was evaluated according to the following criteria. A: None of the three sheets have leaked. B: Bleeding was observed on only one sheet. C: Bleeding was observed on only two sheets. D: Seepage was observed on all three sheets.

[0084] [Table 1]

[0085] As is clear from the results shown in Table 1, the absorbent articles obtained in each Example maintained the same amount of liquid return as the absorbent articles obtained in each Comparative Example, while the humidity inside the article when wet was lower than that of the absorbent articles obtained in each Comparative Example. In particular, as is clear from the comparison between Examples 1 and 2, when the constituent fibers of the meltblown nonwoven fabric used as the back sheet contain triglyceride, the ability to prevent bleeding of liquids with low surface tension is improved. [Explanation of symbols]

[0086] 10 Absorbent articles 11 Skin side sheet 12 Non-skin side sheet 13 Absorbent core 14 Openings

Claims

1. The absorbent article has an absorbent core, a skin-side sheet located closer to the skin than the absorbent core, and a non-skin-side sheet consisting of one or more sheets located closer to the skin than the absorbent core, The sheet materials constituting the non-skin side sheet are all made of fiber sheets, An absorbent article, wherein the absorbent core has a slit-shaped opening penetrating the absorbent core in a thickness direction.

2. The absorbent article according to claim 1 , wherein a total opening area of ​​the slit-shaped openings in a plan view of the absorbent core is 5% to 30% of an apparent area of ​​the absorbent core.

3. the sheet material constituting the non-skin side sheet has a nonwoven fabric, The absorbent article according to claim 1 or 2, wherein the nonwoven fabric comprises fibers containing a thermoplastic resin having fiber-forming ability and a triglyceride.

4. The triglyceride is (a) a mixture of a triglyceride containing at least a group derived from a fatty acid having 16 carbon atoms in one molecule and a triglyceride containing at least a group derived from a fatty acid having 18 carbon atoms in one molecule, or The absorbent article according to claim 3, comprising: (b) a triglyceride containing at least a group derived from a fatty acid having 16 carbon atoms and a group derived from a fatty acid having 18 carbon atoms in one molecule.

5. The absorbent article according to claim 4, wherein the proportion of groups derived from fatty acids having 16 carbon atoms is 1% by mass or more and less than 55% by mass, and the proportion of groups derived from fatty acids having 18 carbon atoms is 5% by mass or more and less than 75% by mass, based on the total amount of groups derived from fatty acids contained in all of the triglycerides contained in the fibers.

6. the sheet material constituting the non-skin side sheet has a laminated structure of a plurality of nonwoven fabrics, The laminate structure includes at least a spunbond layer and a meltblown layer, The ratio of the mass of the spunbond layer to the mass of the nonwoven fabric is 50% by mass or more and 95% by mass or less, The absorbent article according to claim 1 , wherein the ratio of the mass of the meltblown layer to the mass of the nonwoven fabric is 5% by mass or more and 50% by mass or less.

7. The sheet material constituting the non-skin side sheet has a nonwoven fabric including a meltblown layer, The absorbent article according to any one of claims 1 to 5, wherein the fiber diameter of the constituent fibers of the meltblown nonwoven fabric is 0.1 µm or more and 10 µm or less.

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