JP6649429B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles.

  BACKGROUND ART Absorbent articles such as disposable diapers and sanitary napkins are known to contain a deodorant or an antibacterial agent in order to suppress odors derived from excrement (Patent Documents 1 to 3). The deodorant provides a deodorizing function by capturing the substance causing the odor, and the antibacterial agent exerts a deodorizing effect by preventing the generation of odor by suppressing the growth of bacteria that decompose excrement. In addition, the present applicant has developed thin paper containing an antibacterial agent and a deodorant for the purpose of coping with various odor causing substances (Patent Document 4).

JP 2001-276118 A JP 2001-309942 A JP 2013-376A JP-A-2006-169446

  The present invention includes a skin sheet, a non-skin sheet, and an absorber disposed between these sheets, and along a longitudinal direction corresponding to the front-rear direction of the wearer, a front part, a rear part, and an intermediate part thereof. And an intermediate portion including an area that contacts the excretory part of the wearer. In the absorbent article according to the present invention, the absorber has an absorbent core and a core wrap that covers a non-skin side surface of the absorbent core. In the absorbent article according to the present invention, the absorbent body has a cavity having an opening on the non-skin side and a bottom on the skin side, and the bottom constitutes a compacted part. In the absorbent article of the present invention, the core wrap contains a deodorant.

Drawing 1 is a top view showing typically the skin side of the sanitary napkin which is one embodiment of the absorptive article of the present invention. FIG. 2 is a schematic cross-sectional view taken along the line II of FIG. FIG. 3 is a sectional view corresponding to FIG. 2 of a sanitary napkin which is another embodiment of the absorbent article of the present invention.

Detailed description of the invention

  In countries with a hot and humid climate throughout the year, such as Southeast Asia, the conditions are such that odorous components are easily volatilized, and fungi are easily activated in absorbent articles, and the decomposition of compounds in excreta is progressing. Easily cause odor-causing substances. Further, when the time for using one absorbent article is long, even if the absorbent article has strong deodorizing performance, it may be difficult to maintain the deodorizing performance. Absorbent articles using the techniques of Patent Documents 1 to 4 have room for improvement in deodorant performance when used in such an environment.

  The present invention relates to an absorbent article that can continuously exhibit deodorant performance when worn.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.

  As shown in FIGS. 1 and 2, an absorbent article 1 (hereinafter, also referred to as “sanitary napkin 1” or “napkin 1”), which is a preferred embodiment of the present invention, is disposed on the skin side of a wearer. And a non-skin surface sheet 3 disposed on the wearer's clothes side, and an absorber 4 disposed between the sheets 2 and 3. The napkin 1 has a front part 1A arranged on the front side (abdominal side) and a rear part 1C arranged on the rear side (dorsal side) of the wearer, and an intermediate part 1B located between them. It has a vertical direction X extending from the portion 1A to the rear portion 1C via the intermediate portion 1B, and a horizontal direction Y orthogonal to the vertical direction.

  Here, the intermediate portion 1B is a region that is opposed to the liquid excretion part (eg, vaginal opening) of the wearer when worn, in the vertical direction X. In addition, "at the time of wearing" here means the state where the normal proper wearing position (the correct wearing position of the said absorbent article) is maintained, and the case where the absorbent article is displaced from this wearing position Is not included.

  The napkin 1 has a leak-proof groove (hereinafter referred to as a pressing portion 5) formed by pressing the skin sheet 2 and the absorber 4 integrally from the front portion 1 </ b> A to the rear portion 1 </ b> C via the intermediate portion 1 </ b> B. , Simply referred to as leak-proof groove 5). The leak preventing groove 5 extends in the vertical direction X, and a pair of leak preventing grooves 5 exist on both sides with respect to a center line (not shown) bisecting the napkin 1 in the horizontal direction Y.

  In the napkin 1, as shown in FIGS. 1 and 2, the skin sheet 2 and the non-skin sheet 3 each have dimensions larger than the absorber 4 and extend outward from the periphery of the absorber 4. At these extending portions, the peripheral edge sealing portion 6 is formed by being joined to each other by a known joining means such as an adhesive, a heat seal, and an ultrasonic seal. Each of the skin sheet 2 and the non-skin sheet 3 and the absorber 4 may be joined by an adhesive.

  As the material constituting the skin surface sheet 2 and the non-skin surface sheet 3, those usually used in absorbent articles such as napkins and sanitary napkins can be used without particular limitation.

  As a material constituting the skin surface sheet 2, for example, a hydrophilic nonwoven fabric or a perforated film having liquid permeability can be used, and these nonwoven fabrics and films are generally thermoplastic resins, such as polyethylene and polypropylene. It is composed of a polyolefin resin, a polyester resin such as polyethylene terephthalate, or the like.

  As a material constituting the non-skin surface sheet 3, for example, a liquid-impermeable film or a liquid-impermeable nonwoven fabric can be used, and the liquid-impermeable film may have moisture permeability. .

  The absorber 4 extends from the front part 1A to the rear part 1C, and has a substantially rectangular shape that is long in the vertical direction X in plan view. Further, in the napkin 1, as shown in FIG. 1, an adhesive portion (not shown) for fixing the napkin 1 to clothing such as shorts is provided on the non-skin side surface of the napkin 1. The adhesive part is covered with a release sheet when not worn.

  In the present specification, the skin side surface is a surface (a side relatively closer to the wearer's skin) of the napkin 1 and its constituent members (for example, the absorbent body 4) facing the wearer's skin in a worn state, The non-skin side surface is a surface (the side relatively far from the skin of the wearer) of the napkin 1 and its constituent members that faces the side opposite to the skin side of the wearer in the wearing state.

  In the napkin 1, the absorbent body 4 includes an absorbent core containing an absorbent material, and a core wrap that covers the non-skin side surface of the absorbent core. The core wrap is a sheet containing hydrophilic fibers described below, and is also called a core wrap sheet. The core wrap only needs to cover at least the non-skin side surface of the absorbent core, and may further cover the skin side of the absorbent core. When covering the non-skin side and the skin side of the absorbent core with the core wrap, the non-skin side and the skin side of the absorbent core may be covered by wrapping the entire absorbent core with one core wrap, The non-skin surface and the skin surface of the absorbent core may be covered with two core wraps.

  It is preferable that the napkin 1 has a high basis weight region in the intermediate portion 1B, which has a higher basis weight than its peripheral portion. In the napkin 1 shown in FIGS. 1 and 2, the high basis weight region in the intermediate portion 1 </ b> B is a middle and high portion that protrudes toward the wearer's skin side, and has a greater thickness than its surrounding portion. As a result, when the napkin 1 is worn, the high basis weight area of the napkin 1 has a shape that easily fits the liquid excretion part.

  In the napkin 1 according to the present embodiment, as shown in FIG. 2, a high basis weight region in the intermediate portion 1B is formed by laminating an upper absorbent body 4A located on the skin side and a lower absorbent body 4B located on the non-skin side. This is realized by adopting a two-layer absorber structure. The upper absorbent body 4A is configured such that the skin side and the non-skin side of the upper absorbent core 40A are covered with a single core wrap 41A. The lower absorbent body 4B is configured such that the skin side and the non-skin side of the lower absorbent core 40B are covered with a single core wrap 41B.

  In the present embodiment, the non-skin side surface of the upper absorbent body 4A and the skin side surface of the lower absorbent body 4B are arranged so as to be in direct contact with each other, and the upper absorbent body 4A and the lower absorbent body 4B are It is arranged so as to be sandwiched between the face sheet 3. These absorbers 4A and 4B and / or sheets 2 and 3 may be joined to each other by known joining means such as an adhesive.

  In the napkin 1 of the present embodiment, as shown in FIG. 1, a plurality of consolidation portions 8 are intermittently arranged in a vertical direction X and a horizontal direction Y in an intermediate portion 1B. The consolidation part 8 is a part where the constituent material of the napkin 1 is condensed and the density is higher than the surrounding part.

  As shown in FIG. 2, in the napkin 1 having the upper absorbent body 4A and the lower absorbent body 4B in the intermediate portion 1B, the compacted portion 8 exists in the high basis weight region in the intermediate portion 1B, and a part of the high basis weight region is formed. Has formed. Immediately below the consolidation portion 8, a cavity portion 81 and a bottom portion 82 are formed so as to protrude from the core wrap 41B covering the non-skin side surface of the lower absorbent core 40B toward the skin side surface of the upper absorbent core 40A. . Due to the formation of the cavity portion 81 and the bottom portion 82, the upper absorbent core 40A located above the bottom portion 82 is compressed, forming the consolidation portion 8 in which the density of the upper absorbent core 40A is high. In other words, the consolidation portion 8 indicates a region in the thickness direction between the skin side surface of the upper absorbent core 40A and the bottom portion 82 provided in the hollow portion 81.

  The cavity portion 81 has an opening on the non-skin side surface of the lower absorbent body 4B, so that the core wrap 41B on the non-skin side of the lower absorbent body 4B enters the lower absorbent core 40B and reaches the upper absorbent body 4A. Is formed. The cavity 81 is formed so as to enter the upper absorbent core 40A to the inside of the upper absorbent core 40A of the upper absorbent core 4A, and a bottom portion 82 is formed on the skin side of the upper absorbent core 4A. The bottom portion 82 is located so as to compress the absorbent material of the upper absorbent core 40A in the thickness direction toward the skin side of the upper absorbent core 4A, and constitutes the compacted portion 8.

  The wall surface of the hollow portion 81 including the bottom portion 82 is formed by the core wrap 41B in the lower absorbent core 40B, and is formed by both the core wrap 41A and the core wrap 42B in the upper absorbent core 40A. By having the cavity portion 81 and the bottom portion 82, deformation and twisting of the absorber 4 when the napkin 1 is worn is reduced, and in addition to improvement in fit to the body, improvement in deodorant performance described later is expected. it can. The consolidating portion 8, the hollow portion 81, and the bottom portion 82 have a pin embossed from the non-skin side of the lower absorber 4B toward the upper absorber 4A, for example, in a state where the lower absorber 4B and the upper absorber 4A are overlapped. It can be formed by applying.

  It is particularly preferable that the consolidation portion 8 is disposed at least in the intermediate portion 1B, but is not limited thereto. The consolidation portion 8 is preferably present in a region between the pair of leakage prevention grooves 5 on both sides of the intermediate portion 1B, and is more preferably disposed in a central region in the lateral direction Y of the intermediate portion 1B. The presence of the consolidation portion 8 in this region not only improves the fit of the napkin 1 to the body, but also maintains the deodorizing effect described later.

  In the present invention, as long as the consolidation portion 8 is arranged at least in the intermediate portion 1B, the number of the consolidation portions 8 to be formed and the arrangement interval are not particularly limited. For example, in the napkin 1 shown in FIG. 1, a plurality of consolidation portions 8 are provided at equal intervals in three rows in the vertical direction X and the horizontal direction Y. From the viewpoint of improving the fit of the napkin 1 to the body and improving the productivity of the napkin 1, the number of the consolidation portions 8 is 2 or more and 20 or less, and 1 to 5 in the vertical direction X, and It is preferable to arrange 1-4 rows in the horizontal direction Y. From the same viewpoint, it is preferable that the arrangement intervals of the consolidating portions 8 are equal.

In the present invention, the shape and area of the compacted portion 8 in plan view are not particularly limited. For example, in the napkin 1 shown in FIG. 1, the shape of the compacted portion 8 in a plan view is a perfect circle, and its dimensions are the same. As long as the effect of the present invention is achieved, the shape of the compacted portion 8 in plan view may be, for example, an elliptical shape, a triangular shape, or a polygonal shape such as a quadrilateral. May be. The area of the compacted portion 8 when viewed in plan is preferably 0.1 mm ² or more, more preferably 0.5 mm ² or more, and preferably 25 mm ² or less, more preferably 15 mm ² or less.

  From the viewpoint of further enhancing the absorbability of the excreted liquid into the absorber 4, the high basis weight region of the napkin 1 preferably has a low basis weight region having a lower basis weight than the high basis weight region around the napkin 1. . Further, it is preferable that the density of the absorbent material included in the absorbent core in the high basis weight region is higher than the density of the absorbent material in the low basis weight region and lower than the density of the absorbent material in the consolidation portion 8. That is, the density of the absorbent material contained in the absorbent core in each region is preferably such that the consolidation portion 8> the high basis weight region> the low density region.

  The material of the absorbent core constituting the absorbent body 4 can be constituted to include a hydrophilic fiber such as pulp and a superabsorbent polymer. Further, the absorbent core may be composed of the hydrophilic fiber alone. When the hydrophilic fibers are contained in the absorbent core, the excreted liquid is easily transferred from the skin side of the absorber 4 to the non-skin side, and the body fluid is easily brought into contact with the core wrap arranged on the non-skin side. As a result, the odor derived from the excreted liquid can be eliminated. The deodorizing effect of the core wrap will be described later in detail.

  In the napkin 1 of the present embodiment, as shown in FIG. 1, side sheets 9 may be arranged on both sides along the longitudinal direction X on the skin facing surface of the skin sheet 2. The side sheet 9 is preferably disposed over the entire length of the skin sheet 2 in the vertical direction X so as to overlap the left and right sides along the vertical direction X of the skin sheet 2 in plan view. As shown in FIGS. 1 and 2, in the napkin 1, the pair of side sheets 9, 9 are respectively joined to the skin sheet 2 at the joining portions 91.

  The core wraps 41A and 41B of the absorber 4 contain hydrophilic fibers and a deodorant. A typical hydrophilic fiber is a cellulosic fiber such as pulp. As the cellulosic fiber, those conventionally used in absorbent articles can be used without any particular limitation.

  The deodorant included in the core wraps 41A and 41B is a deodorant that directly acts on the odor, for example, a substance capable of absorbing, neutralizing, or decomposing the odor to exhibit a deodorizing effect, and a source of the odor. Substances that can exert a deodorizing effect by acting to suppress the generation of odors. Therefore, the former is a deodorant in a narrow sense, and the latter is a deodorant in a broad sense, which is a concept including an antibacterial agent.

  It is preferable to use an organic deodorant as the deodorant used in the present invention. An organic deodorant can be expected to have high deodorizing properties due to good affinity with the odor-causing substance when the odor-causing substance in the excreted liquid is organic. Preferred as such a deodorant are cationic antibacterial agents, and organic cationic antibacterial agents are particularly preferable from the viewpoint of affinity with organic odor-causing substances and bacteria. The cationic antibacterial agent can suppress generation of a strong putrefaction odor as control of malodor generation. The “organic deodorant” indicates a deodorant containing a component mainly composed of an organic compound.

  As the cationic antibacterial agent, those having the above-mentioned antibacterial action can be used without particular limitation. For example, there are those described in paragraphs [0015] to [0018] of the specification of JP-A-8-99841. One of these cationic antibacterial agents may be used alone, or two or more thereof may be used in combination. Cationic antibacterial agents are antibacterial agents based on organic compounds, and have a wider range of antibacterial action because they are more eluted into excretion fluids such as urine than metal ion systems such as silver, zinc, and copper. In particular, quaternary ammonium salts such as didecyldimethylammonium salt, alkylpyridinium salt, benzethonium salt, benzalkonium salt, monoalkyltrimethylammonium salt, dialkyldimethylammonium salt and the like can be mentioned, and at least one selected from the group consisting of these. Preferably, it contains a species. One of these cationic antibacterial agents may be used alone, or two or more thereof may be used in combination.

The content of the deodorant in the napkin 1 of the present invention, the core wrap 41A, 41B are contained in 0.05 g / ^{m 2} basis weight of not less than the, 0.1 g / ^{m 2} or more preferably, 0.2 g / m ^Two or more are more preferable. The upper limit is not particularly limited from the viewpoint of controlling offensive odor production, and can be appropriately set depending on the use of the article to be used. For example, in the use of absorbent articles, the skin may be in direct contact with the wearer's skin or through excretion for a long time. There is a possibility that the influence and the permeability of excreted urine passing through the sheet may be impaired. Therefore, the upper limit is preferably 1.0 g / ^{m 2} or less, more preferably 0.5 g / ^{m 2} or less, 0.3 g / ^{m 2} or less is more preferable.

  When a cationic antibacterial agent is used as a deodorant, its basis weight can be measured by the following method. When a commercially available product or the like is used for analysis, each member is peeled off using a drier, a cold spray or the like to obtain target core wraps 41A and 41B. Thereafter, the basis weight of the cationic antibacterial agent in the core wrap can be measured with a liquid chromatograph / mass spectrometer (6140 LC / MS, manufactured by Agilent Technologies, Inc., ionization method: ESI). Alternatively, the content of the cationic antibacterial agent can be measured based on a calibration curve prepared by a calibration curve method.

  It is preferable to use a benzalkonium salt represented by the following formula (1) among cationic antibacterial agents from the viewpoint of achieving both antibacterial properties and safety (low irritation to the skin).

In the formula (1), R ¹ and R ² represent the same or different methyl groups, ethyl groups, or linear or branched alkyl or alkenyl groups having 8 to 20 carbon atoms. X ^- represents a monovalent anion.

One of the benzalkonium salts represented by the formula (1) can be used alone or in combination of two or more. In the formula (1), preferred combinations of R ¹ and R ² include, for example, a combination in which R ¹ is a methyl group and R ² is a linear or branched alkyl group having 8 to 20 carbon atoms, Combinations in which ¹ and R ² are the same group, and the group is a linear or branched alkyl group having 8 to 20 carbon atoms. In these combinations, the number of carbon atoms of the alkyl group is more preferably 10 or more and 18 or less.

In the formula (1), the monovalent anion represented by X ⁻ is preferably, for example, a halide ion or an anion active group. "Anionic active group" refers to an ion having anionic surfactant activity.

  Examples of the anionic active group include an anionic active group having 6 or more carbon atoms, particularly 10 or more carbon atoms, and a linear or branched alkyl or alkenyl group having 20 or less carbon atoms, particularly 18 or less carbon atoms. Preferably, it is used. It is preferable to use, for example, an alkyl phosphate ester salt, an alkyl carboxylate salt, an alkyl sulfonate salt, or an alkyl sulfate ester salt as such an anion active group from the viewpoint of enhancing antibacterial performance. In particular, the use of an alkyl phosphoric acid represented by the following formula (2) is preferable because the antibacterial performance is further enhanced.

In the formula (2), one of R ³ and R ⁴ represents a linear or branched alkyl or alkenyl group having 6 to 20 carbon atoms, and the other represents a hydrogen atom, a methyl group or an ethyl group.

Preferred combinations of R ³ and R ⁴ include those in which R ³ is a hydrogen atom and R ⁴ is a linear or branched alkyl group having 8 to 20 carbon atoms. More preferably, the alkyl group has 10 to 18 carbon atoms. By including the benzalkonium salt having an anion active group represented by the formula (2) in the core wraps 41A and 41B, the texture (bulkiness and flexibility) of the paper can be improved in addition to the improvement of the deodorizing performance. It can be suitably used as thin paper used for the core wraps 41A and 41B.

  Among the above-mentioned benzalkonium salts, it is particularly preferable to use benzalkonium cetyl phosphate from the viewpoint of high antibacterial properties, safety and immediate effect. Benzalkonium cetyl phosphate is an organic cationic antibacterial agent that has a good balance between antibacterial properties and low skin irritation (low water solubility) and is relatively safe. It is suitably used as an agent for sheets for absorbent articles 1 such as core wraps 41A and 41B.

  Other deodorants used in the present invention include porous particles. The porous particle in the present invention refers to a particle having a large number of pores at least on the surface of the particle and capable of collecting, adsorbing, and / or including a volatile odor component in the pores. The porous particles may be used alone as a deodorant, or may be used in combination with the above-mentioned cationic antibacterial agent.

  Examples of the material of the porous particles include an organic compound, an inorganic compound, a polymer thereof, and a combination thereof. Specific examples thereof include synthesis of acrylic polymers such as porous methacrylic acid polymers, porous acrylic acid polymers, aromatic polymers such as porous divinylbenzene polymers, porous pyridine copolymers, and copolymers thereof. Porous polymers; natural porous polymers such as chitin and chitosan; zinc oxide, activated carbon, silica, silicon dioxide (silica gel), calcium silicate, aluminosilicate compounds, high silica zeolite (hydrophobic zeolite), sepiolite, cancrinite , Zeolite, and inorganic porous materials such as hydrated zirconium oxide; vinyl such as silver-supported zeolite, silver-supported cancrinite, and silver-supported porous styrene-divinylbenzene-vinylpyridine polymer and silver-supported porous divinylbenzene-vinylpyridine polymer Pyridine Coalescence, include a metal-supported porous such, it preferably contains at least one selected from the group consisting of.

  Among them, it is preferable to contain at least one selected from the group consisting of activated carbon, an aluminosilicate compound and a vinylpyridine copolymer from the viewpoint of improving the deodorizing performance. One of these porous particles may be used alone, or two or more thereof may be used in combination. In particular, the use of a combination of organic porous particles and inorganic porous particles is more effective in that various odor components can be collected at once. Examples of the above-mentioned porous vinylpyridine copolymer include a porous styrene-divinylbenzene-vinylpyridine polymer and a porous divinylbenzene-vinylpyridine polymer. The silver-carrying cancrinite is a cancrinite-like mineral described in paragraphs [0029] to [0045] of JP-A-2005-336363. Note that “organic porous particles” refers to particles having porosity mainly composed of an organic compound, and “inorganic porous particles” refer to particles having porosity mainly composed of an inorganic compound. It means that.

From the viewpoint of more effectively expressing the deodorizing performance, the porous particles used in the present invention preferably have a BET specific surface area of 50 m ² / g or more, more preferably 100 m ² / g or more. , 200 m ² / g or more. Although the upper limit of the BET specific surface area is not particularly limited, it is practical to be 2000 m ² / g or less. In addition, since the deodorizing performance becomes higher as the value of the BET specific surface area of the porous particles is larger, it is preferable that the value of the BET specific surface area be larger within the above range. The BET specific surface area is measured by a multipoint method using liquid nitrogen using a specific surface area / pore distribution measuring device “ASAP2020” manufactured by Shimadzu Corporation, and a value can be derived in a range where the parameter C is positive. . Further, the pore distribution can be measured by a mercury intrusion method.

  From the same viewpoint, the porous particles used in the present invention may have at least an average pore diameter of 0.1 nm or more, preferably 2 nm or more, and more preferably 50 nm or less. More preferably, it is even more preferably 30 nm or less. The pore size of the porous particles can be measured using a specific surface area / pore distribution measuring device “ASAP2020” manufactured by Shimadzu Corporation.

  The shape of the porous particles is not particularly limited as long as the deodorizing effect is exhibited, and may be any of spherical, rod-like or needle-like having a predetermined aspect ratio, irregular shape such as pulverized shape, and the like. The shape of the fine particles can be determined by observing with a scanning electron microscope “JCM-5100” manufactured by JEOL Ltd.

Specific examples of the porous particles, the activated carbon described above, when using the aluminosilicate compound and vinyl pyridine copolymer, respectively its BET specific surface area, 1750m ² / g approximately, 250 meters ² / g approximately, 350 meters ² / g and an average pore diameter of about 4.5 nm, about 20 nm, and about 10 nm, respectively.

  The odor components derived from excreted liquid such as urine and menstrual blood to be deodorized are a mixture of a plurality of components such as ammonia, amines, fatty acids, hydrogen sulfide and mercaptans. Generally, since the molecular size of these odor components is 1 nm or more, it is possible to effectively adsorb a plurality of odor components by using porous particles having an average pore diameter of 2 nm or more as a deodorant. it can.

  In particular, when the porous particles satisfying one of the preferable numerical ranges of the BET specific surface area and the average pore diameter described above are used, the content of the porous particles can be reduced while maintaining high deodorizing performance. It is preferred. Further, by using porous particles that satisfy the preferred numerical ranges of both the BET specific surface area and the average pore diameter, the deodorizing performance is further improved, and the content of the porous particles can be further reduced. preferable. This, coupled with the reduction of the content of the porous particles by the combination with the cationic antibacterial agent described above, sustained and effective antibacterial action and deodorant action, and improved texture of the core wrap, It is possible to improve the feeling of wearing when incorporated in the absorbent article 1.

The basis weight of the porous particles contained in the core wrap, from the viewpoint of obtaining suitably a deodorizing effect, 0.05 g / ^{m 2} or more preferably, 0.1 g / ^{m 2} or more preferably, 0.5 g / ^{m 2} or more Is more preferred. The upper limit is preferably 5 g / m ² or less, more preferably 3 g / m ² or less, and still more preferably 1.0 g / m ² or less, from the viewpoint of suppressing a reduction in the texture of the core wraps 41A and 41B.

  When activated carbon, an aluminosilicate compound and a vinylpyridine copolymer, which are specific examples of the porous particles described above, are used, a further deodorizing function can be added by performing a surface treatment. For example, activated carbon can have a deodorizing function by chemical adsorption to a sulfur-based gas by activating zinc chloride (ZnCl). The aluminosilicate compound can have an antibacterial effect by supporting zinc and the vinylpyridine copolymer can support silver by supporting silver.

  The core wrap of the napkin 1 may further include a water-soluble pH buffer as a deodorant. A pH buffer is an agent that neutralizes acidic or alkaline odor components generated in a liquid phase such as excretion fluid and reduces a change in pH. That is, it is a neutralizing deodorant due to the equilibrium action. Examples of such an agent include, but are not particularly limited to, a weak acid or a conjugate base thereof, or a mixture or salt thereof, a weak base or a co-liquid acid thereof, a mixture thereof, or a salt thereof. Specific examples of the water-soluble pH buffer include citric acid and the like as the weak acid, and metal salts such as Na, K and Ca as the salts thereof. Examples of the weak base include a polyhydroxyamine compound such as tris (hydroxymethyl) aminomethane.

  The pH buffer used in the present invention only needs to contain at least a component that neutralizes either the acidic or alkaline odor component, and it is not necessary to simultaneously neutralize all the acidic and alkaline odor components. . For example, when citric acid is used alone as a weak acid, it is possible to neutralize and deodorize the odor of alkaline odor components such as amines and ammonia. At the same time, a salt of citric acid is generated due to neutralization of citric acid and an alkaline odor component, and a pH buffering action is secondarily generated due to generation of citrate. In addition, even when sodium citrate, which is a salt of a weak acid, is used alone as a pH buffer, or when a mixture of citric acid and citrate is used, a similar pH buffering action occurs. In addition, when tris (hydroxymethyl) aminomethane is used alone as a weak base, or when a mixture of tris (hydroxymethyl) aminomethane and its salt is used, neutralization with acidic odor components is caused. PH buffer action occurs. As described above, in any of the above cases, the deodorizing effect due to the neutralization of the odorous component can be effectively obtained.

  Particularly, the napkin 1 of the present embodiment preferably contains citric acid and tris (hydroxymethyl) aminomethane as the pH buffer. As described above, the combination of the weak acid and the weak base component includes not only the odor derived from the acidic and alkaline odor components but also the neutral odor that could not be suppressed only by the deodorant having the pH buffer property. In addition, the production of odor can be strongly suppressed. As a result, in the absorbent article 1 using the core wrap containing these pH buffers, even when worn for a long time, the odor derived from the excreted liquid is hardly noticeable around the wearer. A high degree of deodorizing effect can be realized.

The basis weight of the pH buffering agent is 0.05 g / m 2 from the viewpoint of effectively neutralizing and eliminating odors derived from acidic or alkaline odor components continuously generated from the excreted liquid of the absorbent article for a long time. ^It is preferably at least ^2, more preferably at least 0.1 g / m ^{2, even} more preferably at least 0.15 g / m ² . The upper limit is not particularly limited, but is preferably 2.0 g / m ² or less, more preferably 1.0 g / m ² or less, and still more preferably 0.5 g / m ² or less, from the viewpoint of manufacturing cost. Specifically, preferably 0.05 g / ^{m 2} or more 2.0 g / ^{m 2} or less, 0.1 g / ^m, more preferably ² or more 1.0 g / ^{m 2} or less, 0.15 g / ^{m 2} or more 0.5g / M ² or less is more preferred.

  The basis weight of the pH buffer can be measured using a known ion chromatography analysis method or the like. For example, for the analysis of anions such as organic acids and phosphoric acids, alkanolamines and the like, qualitative analysis is carried out by Dionex ICS-2100 (manufactured by Thermo Fisher Scientific Co., Ltd., electric conductivity detector, gradient elution method). And the basis weight can be measured.

  From the viewpoint of reducing the residual amount of odor components on the skin side of the napkin 1 and continuously obtaining a deodorizing effect, the core wrap covers the skin side and the non-skin side of the absorbent core, and the non-skin side of the absorbent core. Preferably, the core wrap covering the skin contains a cationic antimicrobial agent, and the core wrap covering the skin side contains a water-soluble pH buffer and porous particles. In the napkin 1 shown in FIGS. 1 and 2, at least the core wrap 41B covering the non-skin side surface of the lower absorbent core 40B contains a cationic antibacterial agent, and the core wrap 41A covering the skin side surface of the upper absorbent core 40A is water-soluble. The effects of the present invention can be obtained if a pH buffer and porous particles are included. The core wrap 41B covering the skin side of the lower absorbent core 40B and the core wrap 41A covering the non-skin side of the upper absorbent core 40A are not particularly limited with the presence of the deodorant, but cover the skin side of the lower absorbent core 40B. It is preferable from the viewpoint of the deodorizing effect that the core wrap 41B further includes a water-soluble pH buffer and porous particles, and the core wrap 41A that covers the non-skin side surface of the upper absorbent core 40A further includes a cationic antibacterial agent.

  The core wraps 41A and 41B of the absorber 4 include the above-described cationic antibacterial agent and porous material from the viewpoint of broadly and strongly suppressing the generation of odors derived from various odor components and the generation of bacteria causing the odor. It is preferable to use one containing all of the particles and the pH buffer. In particular, among them, it is more preferable to use a combination of an organic cationic antibacterial agent, organic porous particles, inorganic porous particles and a pH buffer.

  The method for incorporating the above-mentioned deodorant into the core wrap is not particularly limited. When an organic deodorant and / or a pH buffering agent is contained as a deodorant, for example, a core wrap is applied by spraying or spraying or dipping the core wrap with a deodorant dissolved and mixed in water or an organic solvent and then dried. Can be contained. When porous particles are used as the deodorant, the porous particles can be contained in the core wrap by attaching the porous particles to hydrophilic fibers which are constituent fibers of the core wrap.

  By wearing the absorbent article 1 having the above configuration, the odor caused by the excreted liquid can be effectively suppressed, and the deodorizing effect can be obtained continuously. The following mechanism can be considered as a mechanism for obtaining a sustained deodorizing effect.

  The consolidation part 8 shown in FIGS. 1 and 2 is easier to absorb more excreted liquid than the absorbent cores 40A and 40B other than the consolidation part 8. The excreted liquid absorbed by the consolidation part 8 easily moves to the bottom 82 side, which is the non-skin surface side of the absorber 4, according to gravity. Since the bottom portion 82 including the non-skin side core wrap exists below the consolidation portion 8, the excreted liquid is easily transferred to the non-skin side through the core wrap. As a result that the excretion liquid comes into contact with the deodorant existing in the core wrap on the non-skin side surface, the deodorizing effect of the excretion liquid can be exhibited from an early stage of wearing the absorbent article 1. Further, since the deodorizing is performed at a position far from the skin surface of the napkin 1, the deodorizing effect is enhanced. Further, since the excreted liquid is divided into a part that transfers to the core wrap on the non-skin side surface via the consolidating part 8 and a part that diffuses the absorbent core in the surface direction and the thickness direction, a large amount of excreted liquid is simultaneously dispersed. It is difficult to reach the core wrap on the skin side. Therefore, the deodorizing effect can be easily maintained for a long time.

  When the deodorant is contained not only in the core wrap 41 on the non-skin side but also in the core wrap 41 on the skin side, the excreted liquid directly contacts the core wrap 41 on the skin side to exhibit the deodorizing effect. In addition, since the core wrap 41 on the non-skin side and the excreted liquid are easily brought into contact with the bottom portion 82, the excreted liquid is easily brought into contact with the deodorant, and the deodorizing effect is further enhanced.

  In addition, by including a cationic antibacterial agent as a deodorant, even when the absorbent article 1 of the present invention is worn for a long time, generation and growth of bacteria causing odor can be suppressed, and generation of odor-causing substances can be suppressed. Is preferred because it can suppress In particular, since the antibacterial agent is contained in the non-skin side core wrap 41, the non-skin side core wrap 41 existing in the bottom portion 82 is easily brought into contact with the non-skin side core wrap 41, and the generation of odor-causing substances can be suppressed. Furthermore, even when the excreted liquid is retained or accumulated for a long time on the non-skin side of the absorber 4 via the consolidation part 8, the generation of the odor causing substance can be suppressed in the non-skin side core wrap 41 other than the bottom part 82. It is preferred.

  Furthermore, when the cationic antibacterial agent is contained in the core wrap 41 on the non-skin side and the water-soluble pH buffer and porous particles are contained in the core wrap 41 on the skin side, excretion occurs on the skin side. The porous particles in contact with the liquid adsorb the odor components, and reach the core wrap 41 on the non-skin side via the consolidation portion 8 while dissolving the pH buffer in the excreted liquid to neutralize the odor components. As a result, the residual amount of the odor component particularly on the skin side can be reduced, and the deodorizing effect can be continuously obtained.

  As in the embodiment shown in FIG. 2, when two absorbent cores each having an absorbent core covered with a core wrap are stacked, the excreted liquid that has migrated to the non-skin side via the consolidation part 8 and the bottom part 82. However, the exudate and the deodorant can be brought into contact with each other in a wider area since they are easily diffused in the plane direction between the respective layers. As a result, the deodorizing performance can be maintained for a long time.

  Also, the excreted liquid easily penetrates from the core wrap 41B located at the bottom 82 of the consolidation portion 8 and easily migrates to the lower absorbent body 4B existing on the non-skin side surface. As a result, the deodorizing effect can be expected over both the core wrap 41A that covers the skin side surface of the absorber 4 and the core wrap 41B that covers the non-skin side surface, and the deodorization can be easily performed at a position far from the skin. In addition, since the excreted liquid easily moves to the non-skin side surface of the absorber 4 through the consolidating portion 8, the excreted liquid is prevented from excessively remaining on the skin side surface of the absorber 4, and the excreted liquid is absorbed by the upper absorbent body 4A and the lower absorbent body. Since it is appropriately distributed with the body 4B, the deodorizing effect of the skin-side core wrap 41A is maintained, and even when the absorbent article 1 is worn for a long time, the deodorizing effect is easily obtained.

  When the high basis weight area of the absorber 4 has a higher density than the low basis weight area having a lower basis weight than the high basis weight area located around the high basis weight area, the excreted liquid is preferentially discharged from the high basis weight area. It becomes easier to be absorbed. Since the portion other than the consolidation portion 8 in the high basis weight region has a structure having a lower density than the consolidation portion 8, the absorption of the excreted liquid from the consolidation portion 8 is particularly fast, and the core wrap 41 existing on the bottom portion 82 is provided. It is easier to suppress the generation of odor on the skin side due to the contact between the skin and the excretion fluid.

  Next, another embodiment (second embodiment) of the absorbent article 1 of the present invention will be described with reference to FIG. The second embodiment will be described with a focus on differences from the first embodiment, and the description of the first embodiment will be applied to points not particularly described as appropriate. 3, the same members as those in FIGS. 1 and 2 are denoted by the same reference numerals.

  In the embodiment shown in FIG. 3, unlike the first embodiment shown in FIGS. 1 and 2, the napkin 1 has a single absorber 4. The absorbent body 4 is composed of an absorbent core 40 and a core wrap 41 wrapping the absorbent core 40, and is sandwiched between the skin sheet 2 having unevenness on the skin side and the non-skin sheet 3. ing. The skin sheet 2 is joined to the non-skin sheet 3 via the side sheet 9, and the peripheral sheet is formed by joining the side sheet 9 and the non-skin sheet 3. In the embodiment shown in FIG. 3, the skin sheet 2 and the non-skin sheet 3 are joined via the side sheet 9, but as in the first embodiment, the skin sheet 2 and the non-skin surface are joined. The sheet 3 may be directly joined to form a peripheral seal portion.

  In the napkin 1 shown in FIG. 3, the absorbent body 4 has a cavity 81 projecting from the non-skin side surface of the core wrap 41 toward the skin side surface, and corresponds to a portion above the bottom portion 82 formed by the cavity portion 81. At the position, there is a consolidation portion 8 in which the absorbent material of the absorbent core 40 is compressed. Absorber 4 also has a dent portion 83 that is depressed from the skin side surface to the non-skin side surface of absorber 4 at a position overlapping with consolidation portion 8 in the thickness direction. That is, the consolidation part 8 is formed between the bottom part 82 formed by the cavity part 81 and the depression part 83.

  The consolidation part 8, the cavity part 81, and the bottom part 82 can be formed by performing pin embossing on the absorber 4 from the non-skin side to the skin side, as in the first embodiment. In this case, the depression 83 can be formed at a position corresponding to the consolidation portion 8 by appropriately adjusting the conditions for performing pin embossing, the basis weight of the absorbent core, and the like.

  In the second embodiment, as shown in FIG. 3, the consolidation portion 8 and the recessed portion 83 are provided only at one position in the center in the width direction Y. It may be.

  In this manner, when the absorbent body 4 has the recessed portion 83 on the skin surface side, the excreted liquid is guided to the recessed portion 83 according to gravity and can be made to be in a state where it is more easily absorbed by the compaction portion 8. Further, when pressure (force applied in the thickness direction of the topsheet 2) is applied to the skin sheet 2 due to a state in which the wearer is sitting when the napkin 1 is worn, the depression 83 is less likely to be compressed than other parts. In addition, there is an effect that the state in which the excreted liquid easily enters the consolidating portion 8 can be maintained. Due to the guidance of the excreted liquid to the consolidation part 8 by the recess 83, the contact efficiency between the excreted liquid and the core wrap 41 and the deodorant contained in the core wrap 41 can be further increased, and as a result, the excreted liquid contained in the core wrap 41 can be contained. The deodorant effect obtained by the deodorant can be suitably exerted.

  As shown in FIG. 3, the napkin 1 in the second embodiment is pressed from the skin sheet 2 side of the absorber 4 to the non-skin sheet 3 on both sides of the consolidation section 8 in the lateral direction Y in the intermediate section 1 </ b> B. May be provided. When the pressing portion 5 is provided, the excreted liquid is easily guided to the non-skin side surface of the absorbent body 4 by the consolidation portion 8, and the excreted liquid is also urged by the depression of the pressing portion 5. It is easy to be led to. In the pressing portion 5, since the bottom portion and the non-skin side surface of the core wrap 41 are close to each other, a high deodorizing effect can be expected on the non-skin surface side of the absorber 4, similarly to the compaction portion 8.

  In particular, the pressing portion 5 in the second embodiment is formed as a leakage preventing groove 5 extending in the vertical direction X over the front portion 1A, the intermediate portion 1B, and the rear portion 1C, similarly to the embodiment shown in FIG. If so, the excreted liquid guided to the non-skin side of the absorber 4 in the intermediate portion 1B is deodorized while diffusing in the vertical direction X along the leak-proof groove 5, so that the core wrap 41 and the excreted liquid are in contact with each other. This makes it possible to more effectively suppress the generation of odors.

  Even when the napkin 1 of the second embodiment having the above configuration is worn, the odor caused by the excreted liquid can be effectively suppressed, and the deodorizing effect can be continuously obtained.

  Although the present invention has been described based on the preferred embodiments, the present invention is not limited to the above embodiments. For example, in the first embodiment, the formation position of the consolidation portion 8 is only the high basis weight region. However, in addition to or instead of this, the consolidation portion 8 is formed in the low basis weight region located around the high basis weight region. 8 may be formed.

  Further, in the second embodiment, the consolidation portion 8 is formed only at one position in the center in the width direction. Alternatively, a plurality of consolidation portions 8 may be formed at intervals in the width direction.

  Although the skin sheet of the napkin 1 in the second embodiment has irregularities on its surface, a skin sheet having a flat surface may be used instead. Further, a skin sheet having irregularities on the surface may be applied to the napkin 1 of the first embodiment.

  Each of the above embodiments relates to a napkin as the absorbent article 1. However, the invention is also applicable to other absorbent articles, such as disposable diapers, incontinence pads, panty liners, and the like.

  ADVANTAGE OF THE INVENTION According to this invention, the absorptive article which can exhibit a deodorizing performance continuously can be provided.

Claims (5)

A skin surface sheet, a non-skin surface sheet, and an absorbent body arranged between these sheets, along a longitudinal direction corresponding to the wearer's front-rear direction, a front part, a rear part, and a middle part thereof, An absorbent article including an intermediate portion including an area that abuts the excretion part of a wearer,
The absorber has an absorbent core and a core wrap that covers a non-skin side surface of the absorbent core,
On both sides in the horizontal direction perpendicular to the longitudinal direction of the absorbent article, leak-proof grooves formed by pressing the skin sheet and the absorber integrally, from the front portion through the intermediate portion. And is formed over the rear part,
And in the intermediate portion, said absorbent core, its has an opening in the non-skin side, comprising a cavity having a bottom which constitutes the compaction unit to the skin side, and the compaction unit, the pair of the vibration in a plan view There are multiple between the leak grooves,
An absorbent article, wherein the core wrap covering the non-skin side includes a deodorant and penetrates into an absorbent core in the consolidation portion . The absorbent article according to claim 1, wherein the core wrap that covers a skin side of the absorbent core is disposed. The core wrap covers the skin side and the non-skin side of the absorbent core, the core wrap covering the non-skin side of the absorbent core includes a cationic antibacterial agent, and the core wrap covering the skin side is a water-soluble pH buffer.及beauty including multi porous particles, the absorbent article according to claim 2. The absorber according to any one of claims 1 to 3, wherein the intermediate portion includes a high basis weight region having a basis weight higher than a peripheral portion in the intermediate portion, and includes the consolidation portion in the high basis weight region. 2. The absorbent article according to claim 1. The density of the high basis weight area is higher than that of a low basis weight area having a lower basis weight than the high basis weight area located around the high basis weight area, and the density is lower than that of the consolidation portion. 3. The absorbent article according to claim 1.

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