Absorbent article

Abstract

Provided is an absorbent article having an absorbent polymer, the absorbent article continuously exhibiting a deodorization function while suppressing discomfort when worn. An absorbent article (1) is provided with: an absorbent core (31) having an absorbent material containing an absorbent polymer (81); a liquid-permeable top sheet (21) that is positioned closer to the skin than the absorbent core and that comes into contact with the skin of the wearer; and a liquid-impermeable back sheet (25) positioned closer to the non-skin side than the absorbent core. The absorbent article has deodorizing particles (82), the deodorizing particles (82) containing a deodorizing component, the deodorizing particles (82) being separate from the absorbent polymer. The average particle diameter of the deodorizing particles is smaller than the average particle diameter of the absorbent polymer in an absorption state in which the absorbent article absorbs the bodily fluid.

Description

Technical Field

[0001] The present invention relates to an absorbent article having an absorbent polymer. Background Art

[0002] In Patent Document 1, there is disclosed an odor control composition in which an odor control agent is carried on water-absorbent polymer particles. The odor control composition of Patent Document 1 is obtained by injecting a first odor control agent into water-absorbent polymer particles and mixing the injected water-absorbent polymer particles with a second odor control agent, and is used for absorbent articles such as diapers, diaper pads, and feminine hygiene products.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2022-512196 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] However, the following problems exist in the absorbent article having the above-described odor control composition.

[0008] The odor control agent is integrated with the absorbent polymer. Therefore, it is possible that the absorbent performance of the absorbent polymer is impaired by the odor inhibitor.

[0009] In addition, since the odor control agent and the absorbent polymer are integrated, when the absorbent polymer swells, it is sometimes difficult for the odor inhibitor to come into contact with the odor and body fluid due to gel blockage, and it is difficult to exhibit the deodorizing function.

[0010] By integrating the absorbent polymer and the odor inhibitor, the particle size of the absorbent polymer becomes larger, and sometimes discomfort is caused by contact with the particles during wearing.

[0011] The present invention has been made in view of such problems, and an object thereof is to provide an absorbent article having an absorbent polymer, which can continuously exhibit a deodorizing function while suppressing discomfort during wearing.

[0012] Means for Solving the Problems

[0013] An absorbent article of one embodiment has: an absorbent core having an absorbent material containing an absorbent polymer; a liquid-permeable topsheet positioned on the skin side of the absorbent core and in contact with the skin of the wearer; and a liquid-impermeable backsheet positioned on the non-skin side of the absorbent core. The absorbent article has deodorant particles containing a deodorant component, and the deodorant particles are independent of the absorbent polymer. In the absorbent state where the absorbent article has absorbed body fluid, the average particle size of the deodorant particles is smaller than the average particle size of the absorbent polymer. Description of the Drawings

[0014] Figure 1 is a front view of the absorbent article of the first embodiment.

[0015] Figure 2 is a plan view of the unfolded state of the absorbent article of the first embodiment.

[0016] Figure 3 is along Figure 2 the cross-sectional view taken along line A-A shown.

[0017] Figure 4 is a plan view of the unfolded state of the absorbent article of the second embodiment.

[0018] Figure 5 is along Figure 4 the cross-sectional view taken along line B-B shown.

[0019] Description of Reference Numerals

[0020] 10A, 10B, absorbent articles; 21, topsheet; 25, backsheet; 30, absorbent core; 31, first absorbent core; 32, second absorbent core; 33, core wrapper; 33a, first core wrapper; 33b, second core wrapper; 81, absorbent polymer; 82, deodorant particles; R11, skin-side region; R12, non-skin-side region; L, front-back direction; W, width direction; T, thickness direction; T1, skin side; T2, non-skin side. Detailed Description

[0021] (1) Summary of the Embodiment

[0022] From the descriptions in this specification and the drawings, at least the following matters are clarified.

[0023] The technical solution of Method 1 is an absorbent article, which has: an absorbent core having an absorbent material containing an absorbent polymer; a liquid-permeable topsheet located on the skin side of the absorbent core and in contact with the wearer's skin; and a liquid-impermeable backsheet located on the non-skin side of the absorbent core. The absorbent article has deodorant particles containing a deodorant component, and the deodorant particles are independent of the absorbent polymer. In the absorbed state where the absorbent article has absorbed body fluid, the average particle size of the deodorant particles is smaller than the average particle size of the absorbent polymer. According to this method, since the absorbent polymer and the deodorant particles are relatively independent, the situation where the deodorant component covers the surface of the absorbent polymer and damages the absorption performance of the absorbent polymer is less likely to occur, and the absorption performance of the absorbent polymer can be maintained. In addition, since the absorbent polymer and the deodorant particles are relatively independent, even if the absorbent polymer swells, the deodorant particles continue to be arranged separately, and the deodorant function can be continuously exerted. In addition, since the absorbent polymer and the deodorant particles are relatively independent, the situation where the particle size of the absorbent polymer becomes larger due to the addition of the deodorant component can be suppressed, and the discomfort during wearing can be suppressed. At least in the absorbed state where body fluid has been absorbed, the average particle size of the deodorant particles < the average particle size of the absorbent polymer, and the discomfort during wearing caused by the presence of substances with a relatively large particle size due to the addition of the deodorant particles can be suppressed.

[0024] According to a preferred method, for the technical solution of Method 2, the following features can be included in the technical solution of Method 1. In the non-absorbed state where the absorbent article has not absorbed body fluid, the average particle size of the deodorant particles is smaller than the average particle size of the absorbent polymer. According to this method, in the non-absorbed state, the average particle size of the deodorant particles < the average particle size of the absorbent polymer. During the entire period from the start of wearing until the absorbent article is removed after absorbing body fluid, the average particle size of the deodorant particles is smaller than the average particle size of the absorbent polymer, and the discomfort during wearing caused by the presence of substances with a relatively large particle size can be suppressed during wearing.

[0025] According to a preferred method, for the technical solution of Method 3, the following features can be included in the technical solution of Method 1 or Method 2. The deodorant particles are disposed within the absorbent core. According to this method, the deodorant function can be exerted during the process of introducing body fluid into the absorbent core, and the deodorant function can also be exerted on the body fluid absorbed by the absorbent core.

[0026] According to a preferred embodiment, for the technical solution of Mode 4, it may have the following characteristics in the technical solution of any one of Modes 1 to 3. The absorbent core is covered with a core covering body having fibers. The average particle size of the deodorant particles is larger than the inter-fiber distance of the core covering body. According to this mode, the deodorant particles are not easily passed through the core covering body, and the deodorant particles can be retained in the absorbent core to continuously exert the deodorant function. In addition, the situation where the deodorant particles pass through the core covering body can be suppressed, and the deterioration of the wearing feeling caused by the contact between the deodorant particles passing through the core covering body and the skin can be suppressed.

[0027] According to a preferred embodiment, for the technical solution of Mode 5, it may have the following characteristics in the technical solution of any one of Modes 1 to 4. The absorbent core has a skin-side region located at a position closer to the skin side than the center in the thickness direction of the absorbent core and a non-skin-side region located at a position closer to the non-skin side than the center in the thickness direction of the absorbent core. The weight per unit area of the deodorant particles in the skin-side region is higher than the weight per unit area of the deodorant particles in the non-skin-side region. According to this mode, since the weight per unit area of the deodorant particles in the skin-side region is relatively high, when urine is absorbed and odor is emitted to the skin side of the absorbent article, it is easy to contact the deodorant particles, and the deodorant function can be exerted.

[0028] According to a preferred embodiment, for the technical solution of Mode 6, it may have the following characteristics in the technical solution of any one of Modes 1 to 4. The absorbent core has a skin-side region located at a position closer to the skin side than the center in the thickness direction of the absorbent core and a non-skin-side region located at a position closer to the non-skin side than the center in the thickness direction of the absorbent core. The weight per unit area of the deodorant particles in the non-skin-side region is higher than the weight per unit area of the deodorant particles in the skin-side region. According to this mode, the body fluid inhaled into the absorbent core transfers from the skin-side region to the non-skin-side region, and a large amount of body fluid accumulates on the side of the liquid-impermeable backsheet when being discharged. At this time, since the weight per unit area of the deodorant particles in the non-skin-side region is relatively high, the deodorant function can be exerted on the body fluid inhaled into the non-skin side of the absorbent core. In addition, since the weight per unit area of the deodorant particles in the skin-side region is relatively low, it is not easy to contact the skin. Therefore, the discomfort caused by contact with the deodorant particles can be suppressed during wearing.

[0029] According to a preferred embodiment, the technical solution of embodiment 7 may have the following features in the technical solution of any one of embodiments 1 to 6. The absorbent core has a first absorbent core and a second absorbent core located closer to the non-skin side than the first absorbent core. The weight per unit area of ​​the deodorant particles in the first absorbent core is higher than the weight per unit area of ​​the deodorant particles in the second absorbent core. According to this embodiment, since the weight per unit area of ​​the deodorant particles in the first absorbent core located on the skin side is higher, when urine is absorbed and odor is emitted to the skin side of the absorbent article, it is easy to contact the deodorant particles, thereby exerting a deodorizing function.

[0030] According to a preferred embodiment, the technical solution of embodiment 8 may have the following features in the technical solution of any one of embodiments 1 to 7. The absorbent core comprises a first absorbent core and a second absorbent core located closer to the non-skin side than the first absorbent core. The core wrapper comprises a first core wrapper covering at least the non-skin side of the first absorbent core and a second core wrapper covering at least the skin side of the second absorbent core. The deodorant particles are arranged between the first core wrapper and the second core wrapper. According to this embodiment, the deodorant function can be exerted in the process of introducing body fluid from the first absorbent core to the second absorbent core. In addition, since the absorbent polymer is arranged in the absorbent core and the deodorant particles are arranged outside the absorbent core, the SAP and the deodorant particles can be arranged separately to continuously exert their respective functions. In addition, the deodorant particles are arranged at a position closer to the non-skin side than the first absorbent core and are not easy to contact the skin. Therefore, the discomfort caused by contact with the deodorant particles can be suppressed when worn.

[0031] According to a preferred embodiment, the technical solution of embodiment 9 may have the following features in the technical solution of any one of embodiments 1 to 8. The deodorant particles are arranged between the non-skin side surface of the absorbent core and the backing film. The body fluid absorbed into the absorbent core is transferred from the skin side area to the non-skin side area, and a large amount of body fluid is accumulated on the liquid-impermeable backing film side when being discharged. At this time, since the deodorant particles are arranged between the non-skin side surface of the absorbent core and the backing film, the deodorant function can be exerted on the body fluid absorbed into the non-skin side surface of the absorbent core. In addition, it is easy for the user to grasp the deodorant particles by touch from the outside of the absorbent article through the backing film and perceive the presence of the deodorant particles. Since the deodorant particles are arranged on the backing film side, the presence of the deodorant particles can be perceived by touch while suppressing direct contact between the deodorant particles and the wearer's skin.

[0032] According to a preferred embodiment, for the technical solution of Mode 10, it may have the following characteristics in the technical solution of any one of Modes 1 to 9. The deodorizing particles are composed of porous particles having a plurality of pores. According to this mode, the porous particles are prone to physically adsorb odor components and are more likely to exert the deodorizing function.

[0033] According to a preferred embodiment, for the technical solution of Mode 11, it may have the following characteristics in the technical solution of any one of Modes 1 to 10. The deodorizing particles contain a chelating agent and an antioxidant. According to this mode, the chelating agent chelates with nutrients containing nitrogen (N), sulfur (S), and phosphorus (P) to form a stable compound, preventing the generation of odors caused by the decomposition, oxidation, and volatilization of nutrients. Also, the inclusion of an antioxidant in the deodorizing particles prevents the oxidation of the chelating agent (organic zinc compound) and nutrients.

[0034] According to a preferred embodiment, for the technical solution of Mode 12, it may have the following characteristics in the technical solution of any one of Modes 1 to 11. The deodorizing particles contain a chelating agent and an antibacterial agent. According to this mode, the chelating agent chelates with nutrients containing nitrogen (N), sulfur (S), and phosphorus (P) to form a stable compound, preventing the generation of odors caused by the decomposition, oxidation, and volatilization of nutrients. The inclusion of an antibacterial agent also prevents the reproduction of microorganisms.

[0035] (2) Absorbent article of the embodiment

[0036] Hereinafter, the absorbent article of the embodiment will be described with reference to the drawings. In addition, in the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic diagrams, and the ratios of the respective dimensions are different from the actual situation. Therefore, the specific dimensions and the like should be judged with reference to the following description. In addition, there may also be parts with different dimensional relationships and ratios between the drawings.

[0037] The absorbent article of the present invention is an absorbent article that is worn by a wearer and can absorb the body fluids of the wearer. The wearer can be exemplified by infants, the elderly, etc., but there is no particular limitation. The absorbent article can be a diaper and an incontinence pad for absorbing urine, a sanitary napkin for absorbing menstrual blood, or a panty liner for absorbing leucorrhea. More specifically, the absorbent article can be a short-type diaper, a belt-type diaper, a swim short, a sanitary napkin, an incontinence pad, or a panty liner.

[0038] The absorbent article 10A of the first embodiment is a short-type disposable diaper. Figure 1 It is a schematic front view of the absorbent article 10A of the first embodiment. Figure 2It is a schematic plan view observed from the skin side T1 in the unfolded state of the absorbent article 10A of the first embodiment. Figure 2 The shown schematic plan view shows the extended state in which the absorbent article 10A is extended to a state without wrinkles in a state where a side joint portion 60 described later is unfolded. Figure 3 It is a cross-sectional view along Figure 2 the A-A line shown.

[0039] The absorbent article 10A has a front waist region S1, a rear waist region S2, and a crotch region S3. The front waist region S1 is a region facing the front waist (abdomen) of the wearer. The rear waist region S2 is a region facing the rear waist (back) of the wearer. The crotch region S3 is a region located in the crotch of the wearer and disposed between the front waist region S1 and the rear waist region S2.

[0040] As can be Figure 1 shown, a side joint portion 60 that joins the end portions in the width direction W of the front waist region S1 and the end portions in the width direction W of the rear waist region S2 is provided. As Figure 1 shown, in a state where the side joint portion 60 is formed, a waist opening 62 through which the waist of the wearer passes and surrounds the waist of the wearer and a pair of leg openings 66 through which the legs of the wearer are respectively inserted and surround the leg circumferences of the wearer are formed in the absorbent article 10A. The waist opening 62 may be defined by the front edge of the front waist region S1 and the rear edge of the rear waist region S2. Figure 2 It shows a state in which the side joint portion 60 is released and the absorbent article 10A is unfolded. In the short pants type absorbent article, the boundaries between the front waist region S1 and the crotch region S3 and between the rear waist region S2 and the crotch region S3 may be defined by the inner edge of the side joint portion 60. In addition, the crotch region S3 may also be a region provided with the leg openings 66.

[0041] In addition, the outer portion of the present invention is a portion that occupies a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is the outer edge in the width direction W. The inner portion of the present invention is a portion that occupies a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is the inner edge in the width direction W. In addition, the front end portion and the rear end portion of the present invention are portions that occupy a certain range in the front-rear direction L including the edges in the front-rear direction L, and the front edge and the rear edge are the edges in the front-rear direction L. The outer end portion includes the front end portion and the rear end portion, and the outer edge includes the front edge and the rear edge.

[0042] The absorbent article 10A may have an outer cover 50 and an absorbent body 15. The outer cover 50 covers at least the waist of the wearer at a position on the non-skin side T2 with respect to the absorbent core 30. The outer cover disposed in the front waist region S1 and the outer cover disposed in the rear waist region S2 may be integrated or separated in the front-rear direction L as in the first embodiment.

[0043] The absorbent body 15 may be disposed throughout the front waist region S1, the rear waist region S2, and the crotch region S3. The absorbent body 15 may be configured independently of the outer cover 50 and joined to the outer cover 50 in the front waist region S1 and the rear waist region S2, respectively. The absorbent body 15 may at least have an absorbent core 30, a topsheet 21, and a backsheet 25.

[0044] The absorbent core 30 has an absorbent material for absorbing body fluids. It is sufficient that the absorbent material has at least superabsorbent polymers (SAP), and may also have other absorbent materials such as shredded pulp. The superabsorbent polymers are in a particulate shape. The absorbent core 30 may also have only superabsorbent polymers as the absorbent material and form a so-called SAP sheet together with a core wrapper 33 sandwiching the superabsorbent polymers 81. Alternatively, the absorbent core 30 may be a laminate including the superabsorbent polymers 81 and pulp. The absorbent core 30 may be either one layer or multiple layers. The absorbent core 30 of the first embodiment has a first absorbent core 31 and a second absorbent core 32 located on the non-skin side T2 with respect to the first absorbent core 31. The length of the first absorbent core 31 in the width direction W may be shorter than the length of the second absorbent core 32 in the width direction W.

[0045] The absorbent core 30 may have a skin-side region R11 located at a position closer to the skin side than the center of the absorbent core 30 in the thickness direction T and a non-skin side region R12 located at a position closer to the non-skin side T2 than the center of the absorbent core in the thickness direction. In a single-layer absorbent core 30, the skin-side region R11 and the non-skin side region R12 are provided across the center of the single-layer absorbent core 30 in the thickness direction T. In addition, in a multi-layer absorbent core 30, the skin-side region R11 and the non-skin side region R12 are provided across the center of the thickness direction T in the state where the multi-layer absorbent layers are overlapped. Further, when the thickness of the first absorbent core 31 and the thickness of the second absorbent core 32 are substantially the same (the error in thickness is within 5% of the thickness of either one), it may be that the first absorbent core 31 forms the skin-side region R11 and the second absorbent core 32 forms the non-skin side region.

[0046] The absorbent core 30 may also have a core wrapper 33, which has fibers. As the core wrapper 33, tissue paper and non-woven fabric can be exemplified. In the form having a plurality of absorbent cores, the core wrapper 33 may be arranged to wrap the entire two-layer absorbent core 30, or the core wrapper covering the first absorbent core 31 and the absorbent core having the second absorbent core 32 may be arranged separately. The core wrapper 33 of the first embodiment may have a first core wrapper 33a covering at least the non-skin side T2 surface of the first absorbent core 31 and a second core wrapper 33b covering at least the skin side T1 surface of the second absorbent core 32. The first core wrapper 33a may cover not only the non-skin side T2 surface of the first absorbent core 31 but also other surfaces of the first absorbent core 31. The second core wrapper 33b may cover not only the skin side T1 surface of the second absorbent core 32 but also other surfaces of the second absorbent core 32.

[0047] The topsheet 21 is located on the skin side of the absorbent core 30 and is a liquid-permeable sheet that contacts the wearer's skin. The topsheet 21 can be exemplified by non-woven fabric and can be composed of a single sheet or multiple sheets. The topsheet 21 of the first embodiment has a central sheet 21a covering the center of the absorbent core 30 in the width direction W and side sheets 21b covering the outer portion of the absorbent core 30 or the outer portion of the central sheet 21a. A leak-proof elastic member 35 is fixed to the side sheet 21b to form a leak-proof pleat 36 that stands up toward the wearer's skin side. The leak-proof pleat 36 is arranged on both sides of the absorbent article 10A in the width direction W with respect to the center. The backsheet 25 is located on the non-skin side T2 of the absorbent core 30 and is a liquid-impermeable sheet. The backsheet 25 can be exemplified by a film and can also form the non-skin side T2 surface of the absorbent article 10A. Alternatively, a non-skin side sheet 26 that forms the non-skin side surface of the absorbent article may be arranged on the non-skin side T2 of the backsheet 25. The non-skin side sheet 26 may not have liquid impermeability and can be exemplified by non-woven fabric.

[0048] The absorbent article 10A is configured to continuously exhibit a deodorizing function while suppressing discomfort during wearing caused by the absorbent polymer 81. Next, a structure for continuously exhibiting a deodorizing function while suppressing discomfort during wearing caused by the absorbent polymer 81 will be described in detail. The absorbent article 10A has deodorizing particles 82, which contain deodorizing components and are independent of the absorbent polymer 81. The deodorizing particles 82 only need to have a deodorizing function and may also have other components (antibacterial components, aromatic components, etc.). The deodorizing particles 82 only need to be formed independently of the absorbent polymer 81 and may also be in local contact with the absorbent polymer 81 within the absorbent article 10A.

[0049] According to this structure, since the absorbent polymer 81 and the deodorant particles 82 are relatively independent, the situation where the deodorant components cover the surface of the absorbent polymer 81 and the like and the deodorant components damage the absorption performance of the absorbent polymer 81 is less likely, and the absorption performance of the absorbent polymer 81 can be maintained. In addition, since the absorbent polymer 81 and the deodorant particles 82 are relatively independent, even if the absorbent polymer 81 swells, the deodorant particles 82 continue to be disposed separately, and the deodorizing function can be continuously exerted. In addition, since the absorbent polymer 81 and the deodorant particles are relatively independent, the situation where the particle diameter of the absorbent polymer 81 increases due to the addition of the deodorant components can be suppressed, and the discomfort during wearing can be suppressed.

[0050] In the absorbed state where the absorbent article 10A has absorbed body fluid, the average particle diameter of the deodorant particles 82 is smaller than the average particle diameter of the absorbent polymer 81. In the absorbed state, the average particle diameter of the deodorant particles < the average particle diameter of the absorbent polymer, and the discomfort during wearing caused by the presence of substances with a larger particle diameter due to the addition of the deodorant particles can be suppressed. The particle diameter in the absorbed state where body fluid has been absorbed can be measured by the following method. First, the deodorant particles and the absorbent polymer are taken out from the absorbent article. 1 L of 0.9 wt% physiological saline at 25 ± 1°C is prepared for each. The particles to be measured (absorbent polymer, deodorant particles) are placed in each physiological saline at a ratio of 1 g per 1 L of physiological saline. After 1 hour of placement, the particles are taken out onto a sieve or net with a coarseness that prevents the particles from leaking, and left for 15 minutes to remove the moisture. The diameter of each particle is measured with an electron microscope, and the average value of 30 randomly selected particles is taken as the average particle diameter.

[0051] In the non-absorbed state where the absorbent article has not absorbed body fluid, the average particle diameter of the deodorant particles 82 may also be smaller than the average particle diameter of the absorbent polymer 81. According to this structure, during the entire period from the start of wearing until the absorbent article is removed after absorbing body fluid, the average particle diameter of the deodorant particles is smaller than the average particle diameter of the absorbent polymer, and the discomfort during wearing caused by the presence of substances with a larger particle diameter due to the addition of the deodorant particles can be suppressed. The non-absorbed state is the state before the absorbent article is used. For example, the superabsorbent polymer and the deodorant particles are taken out in the state where the package has been opened and the absorbent article has been taken out, and their particle diameters are measured. The conditions such as temperature and humidity are the same as those in the absorbed state. Regarding the particle diameter in the non-absorbed state, the deodorant particles and the absorbent polymer are taken out from the absorbent article, the particle diameter of each particle is measured with an electron microscope, and the average value of 30 randomly selected particles is taken as the average particle diameter.

[0052] The deodorant particles 82 can be disposed within the absorbent core 30. The deodorant particles 82 can either be mixed into an absorbent material such as the absorbent polymer 81 to form a laminate together with the absorbent material, or be disposed within the absorbent sheet together with the absorbent polymer 81. According to this mode, the deodorant function can be exerted during the process of introducing body fluid into the absorbent core 30, and the deodorant function can also be exerted on the body fluid absorbed by the absorbent core 30. In the first embodiment, the absorbent polymer 81 and the deodorant particles 82 are disposed within the first absorbent core 31. In this configuration, the deodorant particles 82 can either be disposed within the second absorbent core 32 or not disposed within the second absorbent core 32.

[0053] The average particle diameter of the deodorant particles 82 can be larger than the inter-fiber distance of the core covering 33. More specifically, it is sufficient that the average particle diameter of the deodorant particles 82 in the absorbed state is larger than the inter-fiber distance of the core covering 33. Preferably, it is sufficient that the average particle diameter of the deodorant particles 82 in the non-absorbed state is larger than the inter-fiber distance of the core covering. According to this mode, the deodorant particles 82 are not easily passed through the core covering 33, and the deodorant particles 82 can be retained within the absorbent core 30 to continuously exert the deodorant function. In addition, the situation where the deodorant particles 82 pass through the core covering 33 can be suppressed, and the deterioration of the wearing feeling caused by the contact of the deodorant particles that have passed through the core covering 33 with the skin can be suppressed.

[0054] In addition, the inter-fiber distance of the core covering 33 can be measured by the following method.

[0055] An article obtained by cutting (sectioning in the thickness direction) a part corresponding to the sample of the measurement object into a quadrilateral shape is used as a specimen, and a magnified image with consistent focus from the surface of the specimen to a depth of 100 μm (for example, an image magnified 500 times) is obtained using the 3D image connection function of a microscope (VHX-2000 manufactured by KEYENCE, lens VH-Z20W aperture wide open). The outside of the fibers with consistent focus is extracted based on this magnified image. The surface formed here is taken as the fiber space. The diameter of the largest inscribed circle of this fiber space is taken as the fiber space distance, and the average value at 100 fiber spaces is taken as the average inter-fiber distance (Dp).

[0056] The weight per unit area of the deodorant particles 82 in the first absorbent core 31 can be higher than that of the deodorant particles 82 in the second absorbent core 32. More specifically, deodorant particles 82 can be provided in both the first absorbent core 31 and the second absorbent core 32, and the weight per unit area of the deodorant particles 82 in the first absorbent core 31 and the second absorbent core 32 can be different. Alternatively, as in the first embodiment, deodorant particles 82 can be provided in the first absorbent core 31 and not provided in the second absorbent core 32. According to this mode, since the weight per unit area of the deodorant particles 82 in the first absorbent core 31 on the skin side T1 is higher, it is easy to contact the deodorant particles 82 when urine is absorbed or when odor is emitted to the skin side T1 of the absorbent article 10A, and the deodorizing function can be exerted. As a structure that can obtain the same effect as this structure, the weight per unit area of the deodorant particles 82 in the skin-side region R11 can be higher than that of the deodorant particles 82 in the non-skin-side region R12. According to this structure, too, since the weight per unit area of the deodorant particles 82 in the skin-side region R11 is higher, it is easy to contact the deodorant particles 82 when urine is absorbed or when odor is emitted to the skin side T1 of the absorbent article 10A, and the deodorizing function can be exerted.

[0057] In a modified example, the weight per unit area of the deodorant particles 82 in the second absorbent core 32 can be higher than that of the deodorant particles 82 in the first absorbent core 31. Body fluid transfers from the first absorbent core 31 to the second absorbent core 32, and a large amount of body fluid accumulates on the side of the liquid-impermeable backsheet 25 when discharged. At this time, since the weight per unit area of the deodorant particles 82 in the second absorbent core 32 is higher, the deodorizing function can be exerted on the body fluid inhaled into the non-skin side T2. In addition, since the weight per unit area of the deodorant particles 82 in the first absorbent core 31 is low, it is not easy to contact the skin. Therefore, discomfort caused by contact with the deodorant particles 82 can be suppressed during wearing. As a structure that can obtain the same effect as this modified example, the weight per unit area of the deodorant particles 82 in the non-skin-side region R12 can be higher than that of the deodorant particles 82 in the skin-side region R11. According to this structure, too, since the weight per unit area of the deodorant particles 82 in the non-skin-side region R12 is higher, the deodorizing function can be exerted on the body fluid inhaled into the non-skin side T2 of the absorbent core 30. In addition, since the weight per unit area of the deodorant particles 82 in the skin-side region R11 is low, it is not easy to contact the skin. Therefore, discomfort caused by contact with the deodorant particles 82 can be suppressed during wearing.

[0058] The deodorant particles 82 can be disposed between the first core wrapper 33a and the second core wrapper 33b. According to this mode, the deodorant function can be exerted during the process of introducing body fluid from the first absorbent core 31 to the second absorbent core 32. In addition, since the absorbent polymer 81 is disposed within the absorbent core 30 and the deodorant particles 82 are disposed outside the absorbent core 30, the absorbent polymer 81 and the deodorant particles 82 can be separately disposed to continuously exert their respective functions. In addition, the deodorant particles 82 are disposed at a position closer to the non-skin side T2 than the first absorbent core 31 and are not easily in contact with the skin. Therefore, discomfort caused by contact with the deodorant particles can be suppressed during wearing.

[0059] In the plan view of the absorbent article 10A, the deodorant particles 82 can be disposed over the entire region of the absorbent core 30 or a part of the region of the absorbent core 30. For example, the deodorant region R82 in which the deodorant particles 82 are disposed can be disposed across the center in the width direction W of the absorbent core 30. In addition, as Figure 3 shown, the deodorant region R82 can be 80% or less, or 50% or less, of the entire region in the width direction W of the absorbent core 30. The deodorant region R82 of the first embodiment is provided in a part of the region in the width direction W of the first absorbent core 31.

[0060] The weight per unit area of the absorbent polymer 81 in the first absorbent core 31 can be higher than the weight per unit area of the absorbent polymer 81 in the second absorbent core 32. Similarly, the weight per unit area of the absorbent polymer 81 in the skin-side region R11 can be higher than the weight per unit area of the absorbent polymer 81 in the non-skin side region R12. According to this structure, the situation where the odor is emitted toward the skin side T1 can be suppressed by the barrier of the absorbent polymer 81 in the first absorbent core 31 (or the skin-side region R11), and the deodorant function can be exerted on the odor in the absorbent core 30.

[0061] In addition, in the modified example, the weight per unit area of the absorbent polymer 81 in the first absorbent core 31 can be lower than that of the absorbent polymer 81 in the second absorbent core 32. Similarly, the weight per unit area of the absorbent polymer 81 in the skin-side region R11 can be lower than that of the absorbent polymer 81 in the non-skin-side region R12. According to this structure, a large amount of body fluid can be retained by the absorbent polymer 81 in the second absorbent core 32 (or the non-skin-side region R12), and the deodorizing function can be exerted during the volatilization of the odor of the body fluid. In addition, it is possible to suppress the blockage caused by the absorbent polymer in the first absorbent core 31 (or the skin-side region R11), and the body fluid can be continuously inhaled into the absorbent core 30 even when the body fluid is repeatedly discharged. In addition, since the absorbent polymer 81 is less in the first absorbent core 31 (skin-side region R11), the absorbent polymer 81 is less likely to come into contact with the skin, and the discomfort caused by contact with the absorbent polymer 81 can be suppressed during wearing.

[0062] The deodorant particles of the first embodiment are disposed in the first absorbent core 31 and between the first core wrapper 33a and the second core wrapper 33b. However, the arrangement of the absorbent article of the first embodiment is not limited to this form. For example, the deodorant particles 82 may be disposed only in the first absorbent core 31, may be disposed only between the first core wrapper 33a and the second core wrapper 33b, or may be arranged in other ways such as the second embodiment, the third embodiment, the fourth embodiment, and the modified example.

[0063] Next, the absorbent article 10B of the second embodiment will be described. In addition, in the following description, the same reference numerals are used for the same structures as those of the first embodiment, and the description thereof is omitted. Figure 4 It is a plan view of the absorbent article 10B of the second embodiment as viewed from the skin side T1. Figure 5 It is along Figure 4 The cross-sectional view taken along the line B-B shown. The absorbent article 10B of the second embodiment is a light incontinence pad. The light incontinence pad can be provided with a fixing portion 29 on the non-skin side T2 surface of the bottom sheet 25 and fixed to the inner surface of a wearing article such as underwear or a diaper for use.

[0064] The absorbent core 30 of the absorbent article 10B has a first absorbent core 31 and a second absorbent core 32. The length in the width direction W of the first absorbent core 31 and the length in the width direction W of the second absorbent core 32 can be the same. The first absorbent core 31 and the second absorbent core 32 may have only an absorbent polymer as an absorbent material to form a so-called SAP sheet. The absorbent article 10B may be provided with a second sheet 27 having liquid permeability between the top sheet 21 and the absorbent core 30.

[0065] The deodorant particles 82 of the absorbent article 10B are arranged in the SAP sheet. The SAP sheet is composed of an absorbent polymer 81 and a plurality of core wraps 33 sandwiching the absorbent polymer 81. The deodorant particles 82 are sandwiched by the plurality of core wraps 33 together with the absorbent polymer. According to this structure, the deodorant function can be exerted even in the process of introducing body fluid into the absorbent core, and the deodorant function can also be exerted for body fluid absorbed by the absorbent core.

[0066] Next, the modified examples are described. In modified example 1, the deodorant particles 82 can be arranged between the absorbent core 30 and the second sheet 27 or between the second sheet 27 and the top sheet 21. According to this structure, the deodorant particles come into contact with the body fluid during the process of introducing the body fluid from the top sheet side to the absorbent core side, and the deodorant effect can be exerted. In particular, when the body fluid is a small amount and the body fluid is not introduced into the absorbent core, the deodorant particles come into contact with the body fluid and the deodorant effect can be exerted. In addition, since the absorbent polymer 81 is arranged in the absorbent core 30 and the deodorant particles 82 are arranged outside the absorbent core 30, the absorbent polymer 81 and the deodorant particles 82 can be arranged separately to continuously exert their respective functions.

[0067] In variation 2, deodorant particles 82 can be arranged between the absorbent core 30 and the backing film 25. The body fluid absorbed into the absorbent core is transferred from the skin side area to the non-skin side area, and a large amount of body fluid is accumulated on the liquid-impermeable backing film side when being discharged. At this time, since deodorant particles are arranged between the non-skin side surface of the absorbent core and the backing film, the deodorant function can be exerted on the body fluid absorbed into the non-skin side surface of the absorbent core. In addition, the user can easily grasp the deodorant particles through the backing film from the outside of the absorbent article and perceive the presence of the deodorant particles. Since the deodorant particles are arranged on the backing film side, the presence of the deodorant particles can be perceived by touch while suppressing the direct contact between the deodorant particles and the wearer's skin. In addition, since the absorbent polymer 81 is arranged in the absorbent core 30 and the deodorant particles 82 are arranged outside the absorbent core 30, the absorbent polymer 81 and the deodorant particles 82 can be arranged separately to continuously exert their respective functions. In addition, the deodorant particles 82 are arranged at a position closer to the non-skin side T2 than the absorbent core 30, and are not easy to contact the skin. Therefore, it is possible to suppress the discomfort caused by contact with the deodorant particles when wearing.

[0068] In modification 3, the deodorant particles 82 may be arranged in the leakage-proof gathers. Specifically, the deodorant particles 82 may be arranged in the area where the side sheets are stacked together with the leakage-proof elastic member 35. According to this structure, since the deodorant particles are arranged in the leakage-proof gathers standing on both sides of the width direction relative to the center of the width direction of the absorbent article, the deodorant function can be exerted in the process of odor flowing from the absorbent article to the side.

[0069] In the above description, multiple configurations of the deodorant particles 82 are described. The configuration of the deodorant particles is not limited to the described embodiments or modified examples. For example, in the absorbent article of the first embodiment, the deodorant particles 82 can be disposed only within the first absorbent core 31, only between the first core wrapper 33a and the second core wrapper 33b, or can be configured in other ways such as the second embodiment, the third embodiment, the fourth embodiment, modified examples, etc. That is, the configuration of the deodorant particles 82 can be appropriately selected from the above configurations and can be appropriately combined.

[0070] As a common structure in the above embodiments and modified examples, the deodorant particles 82 of the present invention can be composed of porous particles having a plurality of pores. The porous particles are prone to physically adsorb odor components and are more likely to exhibit a deodorizing function. As the porous particles, for example, silica gel, activated alumina, zeolite, calcium silicate, bentonite, acid clay, calcium carbonate can be used, and preferably, silica gel can be used.

[0071] The deodorant particles 82 can use, for example, inorganic components such as metal oxides, inorganic acids, chlorine compounds, peroxides, metal chelates, surfactants, nitrogen compounds, organic acids, ester compounds, cyclodextrin, aldehydes, organosilicons, and natural-derived components such as polyphenol compounds and vitamins.

[0072] The deodorant particles 82 can contain a chelating agent and an antioxidant. The chelating agent chelates with nutrients containing nitrogen (N), sulfur (S), and phosphorus (P) to form stable compounds, preventing the generation of odors caused by the decomposition, oxidation, and volatilization of nutrients. And, the antioxidant is included in the deodorant particles 82 to prevent the oxidation of the chelating agent and nutrients. Additionally, as the chelating agent, an organic zinc compound can be preferably used, and as the antioxidant, flavonoids and vitamin C can be preferably used.

[0073] Furthermore, the deodorant particles 82 can contain a chelating agent and an antibacterial agent. It is possible to prevent the reproduction of microorganisms using the antibacterial agent while preventing the generation of odors caused by the decomposition, oxidation, and volatilization of nutrients using the chelating agent. Additionally, as the antibacterial agent, flavonoids and quaternary ammonium salts can be preferably used.

[0074] As described above, the present invention has been described in detail using the above embodiments and modified examples, but it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented in a modified and changed manner without departing from the gist and scope of the present invention determined by the claims. Therefore, the description in this specification is for illustrative purposes and does not have any restrictive meaning for the present invention.

Claims

1. An absorbent article having: An absorbent core having an absorbent material containing an absorbent polymer; A liquid-permeable topsheet positioned on the skin side of the absorbent core and in contact with the skin of the wearer; and A liquid-impermeable backsheet positioned on the non-skin side of the absorbent core, wherein the absorbent article has deodorant particles containing a deodorant component, the deodorant particles being independent of the absorbent polymer, and in an absorbed state where the absorbent article has absorbed body fluid, an average particle diameter of the deodorant particles is smaller than an average particle diameter of the absorbent polymer.

2. The absorbent article according to claim 1, wherein in a non-absorbed state where the absorbent article has not absorbed body fluid, an average particle diameter of the deodorant particles is smaller than an average particle diameter of the absorbent polymer.

3. The absorbent article according to claim 1 or 2, wherein the deodorant particles are disposed within the absorbent core.

4. The absorbent article according to claim 3, wherein the absorbent core is covered with a core wrapper having fibers, and an average particle diameter of the deodorant particles is larger than an inter-fiber distance of the core wrapper.

5. The absorbent article according to claim 3, wherein the absorbent core has a skin-side region positioned on the skin side of the center in the thickness direction of the absorbent core and a non-skin-side region positioned on the non-skin side of the center in the thickness direction of the absorbent core, and a weight per unit area of the deodorant particles in the skin-side region is higher than a weight per unit area of the deodorant particles in the non-skin-side region.

6. The absorbent article according to claim 3, wherein the absorbent core has a skin-side region positioned on the skin side of the center in the thickness direction of the absorbent core and a non-skin-side region positioned on the non-skin side of the center in the thickness direction of the absorbent core, and a weight per unit area of the deodorant particles in the non-skin-side region is higher than a weight per unit area of the deodorant particles in the skin-side region.

7. The absorbent article according to claim 3, wherein the absorbent core has a first absorbent core and a second absorbent core positioned on the non-skin side of the first absorbent core, and a weight per unit area of the deodorant particles in the first absorbent core is higher than a weight per unit area of the deodorant particles in the second absorbent core.

8. The absorbent article according to claim 4, wherein the absorbent core has a first absorbent core and a second absorbent core positioned on the non-skin side of the first absorbent core, the core wrapper has a first core wrapper covering at least the non-skin-side surface of the first absorbent core and a second core wrapper covering at least the skin-side surface of the second absorbent core, and the deodorant particles are disposed between the first core wrapper and the second core wrapper.

9. The absorbent article according to claim 1 or 2, wherein the deodorant particles are disposed between the non-skin-side surface of the absorbent core and the backsheet.

10. The absorbent article according to claim 1 or 2, wherein the deodorant particles are composed of porous particles having a plurality of pores.

11. The absorbent article according to claim 1 or 2, wherein, the deodorant particles comprise a chelating agent and an antioxidant.

12. The absorbent article according to claim 1 or 2, wherein, the deodorant particles comprise a chelating agent and an antibacterial agent.

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