JP2019025305A - Absorbent article - Google Patents

Abstract

To provide an absorbent article capable of continuously exerting deodorant performance when a user wears it.SOLUTION: An absorbent article 1 of the present invention comprises a skin surface sheet 2, a non-skin surface sheet 3, and an absorber 4 that is arranged between these sheets. The absorber 4 has an absorbent core 40, and a core wrap 41 for coating a non-skin side surface of the absorbent core 40. The absorber 4 comprises a cavity part 81 that has an opening on its non-skin side and that has a bottom 82 on a skin side. The bottom 82 constitutes a consolidation part 8 in which density of the absorbent core 40 is high. The core wrap 41 includes a deodorant.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an absorbent article.

  Absorbent articles such as disposable diapers and sanitary napkins are known in which deodorants and antibacterial agents are blended in order to suppress odors derived from excrement (Patent Documents 1 to 3). The deodorant provides a deodorizing function by capturing the odor-causing substance, and the antibacterial agent suppresses the growth of bacteria that decompose the excrement, thereby preventing the generation of odor and exerting a deodorizing effect. Further, the present applicant has developed a thin paper containing an antibacterial agent and a deodorant for the purpose of dealing with various odor-causing substances (Patent Document 4).

JP 2001-276118 A JP 2001-309942 A JP 2013-376 Japanese Patent Laid-Open No. 2006-169446

  The present invention includes a skin sheet, a non-skin sheet, and an absorbent body disposed between the sheets, along the longitudinal direction corresponding to the wearer's front-rear direction, the front part, the rear part, and the middle thereof. It is an absorptive article provided with an intermediate part including a field which is located in and contacts a wearer's excretion part. In the absorbent article of the present invention, the absorbent body has an absorbent core and a core wrap that covers a non-skin side surface of the absorbent core. In the absorbent article of the present invention, the absorbent body has a hollow portion having an opening on the non-skin side and a bottom portion on the skin side, and the bottom portion constitutes a consolidated portion. In the absorbent article of the present invention, the core wrap includes 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 cross-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 such as Southeast Asia where the climate is hot and humid throughout the year, odorous components are likely to be volatilized, and the fungal activity tends to be active in absorbent articles, leading to the decomposition of compounds in excreta. Odor-causing substances are likely to occur. Furthermore, if 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 terms of deodorizing performance when used in such an environment.

  The present invention relates to an absorbent article capable of continuously exerting deodorant performance when worn.

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

  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 the wearer as shown in FIGS. 1 and 2. A non-skin surface sheet 3 disposed on the clothing side of the wearer, and an absorbent body 4 disposed between these sheets 2 and 3. The napkin 1 has a front part 1A arranged on the front side (abdominal side) of the wearer, a rear part 1C arranged on the rear side (back side), and an intermediate part 1B located between them, and a front part. It has a longitudinal direction X extending from the part 1A to the rear part 1C via the intermediate part 1B and a transverse direction Y perpendicular to the longitudinal direction X.

  Here, the intermediate portion 1 </ b> B is a region that is oppositely disposed in the longitudinal direction X so as to come into contact with a liquid excretion portion (such as a vaginal opening) of the wearer when worn. In addition, "at the time of wearing" here means a state in which a normal proper wearing position (correct wearing position of the absorbent article) is maintained, and the absorbent article is in a state shifted from the 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 1A through the intermediate portion 1B to the rear portion 1C. , Also simply referred to as a leak-proof groove 5). The leak-proof grooves 5 extend in the vertical direction X, and there exist a pair on both sides with respect to a center line (not shown) that bisects 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 have dimensions larger than the absorbent body 4, respectively, and extend outward from the periphery of the absorbent body 4. At the extended portions, the peripheral seal portion 6 is formed by being joined to each other by a known joining means such as an adhesive, a heat seal, or an ultrasonic seal. The skin sheet 2 and the non-skin sheet 3 may be bonded to the absorbent body 4 with an adhesive.

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

  As a material constituting the skin 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 comprised from polyester resin, such as polyolefin resin and polyethylene terephthalate.

  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 longitudinal direction X in plan view. Moreover, in the napkin 1, as shown in FIG. 1, the adhesive part (not shown) which fixes this napkin 1 to clothes, such as shorts, is provided in the non-skin side surface of the napkin 1. As shown in FIG. The adhesive part is covered with a release sheet when not worn.

  In this specification, the skin side surface is a surface (side relatively close to the wearer's skin) directed to the skin side of the wearer in the wearing state in the napkin 1 and its constituent members (for example, the absorbent body 4). The non-skin side surface is a surface (side relatively distant from the wearer's skin) that is directed to the side opposite to the skin side of the wearer in the wearing state in the napkin 1 and its constituent members.

  In the napkin 1, the absorbent body 4 includes an absorbent core including an absorbent material and a core wrap that covers the non-skin side surface of the absorbent core. A core wrap is a sheet-like thing containing the hydrophilic fiber mentioned later, 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 surface side of the absorbent core. When covering the non-skin surface side and the skin surface side of the absorbent core with the core wrap, the non-skin surface side and the skin surface side of the absorbent core may be covered so as to wrap the entire absorbent core with a single core wrap, You may cover the non-skin surface and skin surface of an absorptive core with two core wraps.

  It is preferable that the napkin 1 is provided with a high basis weight region having a basis weight higher than that of the peripheral part in the intermediate part 1B. In the napkin 1 shown in FIG.1 and FIG.2, the high basic weight area | region in the intermediate part 1B becomes the middle-high part which protruded toward the wearer's skin side, and thickness is larger than the surrounding part. As a result, when the napkin 1 is worn, the high basis weight region of the napkin 1 has a shape that easily fits the liquid excretion part.

  In the napkin 1 in the present embodiment, as shown in FIG. 2, the high basis weight region in the intermediate portion 1 </ b> B is laminated with the upper layer absorbent body 4 </ b> A located on the skin side and the lower layer absorbent body 4 </ b> B located on the non-skin side. This is realized by using a two-layer absorber structure. The upper layer absorbent body 4A is configured by covering the skin side surface and the non-skin side surface of the upper layer absorbent core 40A with a single core wrap 41A. The lower layer absorbent body 4B is configured such that the skin side surface and the non-skin side surface of the lower layer absorbent core 40B are covered with a single core wrap 41B.

  In this embodiment, it arrange | positions so that the non-skin side surface of the upper layer absorber 4A and the skin side surface of the lower layer absorber 4B may contact directly, and the upper layer absorber 4A and the lower layer absorber 4B are the skin sheet 2 and non-skin. It is arranged so as to be sandwiched between the face sheet 3. The absorbers 4A and 4B and / or the sheets 2 and 3 may be joined to each other by a known joining means such as an adhesive.

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

  As shown in FIG. 2, in the napkin 1 having the upper layer absorbent body 4A and the lower layer absorbent body 4B in the intermediate portion 1B, the consolidated 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. Forming. A cavity portion 81 and a bottom portion 82 are formed immediately below the consolidated portion 8 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. . By forming the cavity 81 and the bottom 82, the upper absorbent core 40A positioned above the bottom 82 is compressed, and the consolidated portion 8 having a high density of the upper absorbent core 40A is formed. That is, the compacted portion 8 refers to a region in the thickness direction between the skin side surface of the upper absorbent core 40 </ b> A and the bottom portion 82 provided in the cavity portion 81.

  The hollow portion 81 has an opening on the non-skin side surface of the lower layer absorbent body 4B so that the core wrap 41B on the non-skin side of the lower layer absorbent body 4B enters the lower layer absorbent core 40B and reaches the upper layer absorbent body 4A. Is formed. The cavity 81 is formed so as to enter the upper absorbent core 40A up to the inside of the upper absorbent core 40A of the upper absorbent body 4A, and a bottom 82 is formed on the skin side of the upper absorbent body 4A. The bottom portion 82 is positioned 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 body 4A, and constitutes the consolidated portion 8.

  The wall surface of the cavity 81 including the bottom portion 82 is formed by the core wrap 41B in the lower layer absorbent core 40B, and is formed by both the core wrap 41A and the core wrap 42B in the upper layer absorbent core 40A. By having the cavity part 81 and the bottom part 82, the deformation | transformation and twist of the absorber 4 at the time of wearing of the napkin 1 decrease, and in addition to the fitting property to a body improving, the improvement of the deodorizing performance mentioned later is anticipated. it can. The consolidated portion 8, the cavity portion 81, and the bottom portion 82 are pin-embossed from the non-skin side of the lower absorbent body 4B toward the upper absorbent body 4A side, for example, in a state where the lower absorbent body 4B and the upper absorbent body 4A are overlapped. It can be formed by applying.

  The consolidated part 8 is particularly preferably provided at least in the intermediate part 1B, but is not limited thereto. The consolidated portion 8 is preferably present in a region sandwiched between the pair of leakage prevention grooves 5 on both sides in the intermediate portion 1B, and more preferably disposed in the central region in the lateral direction Y of the intermediate portion 1B. The presence of the compacted portion 8 not only improves the fit of the napkin 1 to the body, but can also maintain the deodorizing effect described below.

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

In the present invention, the shape and area when the consolidated portion 8 is viewed in plan are not particularly limited. For example, in the napkin 1 shown in FIG. 1, the shape of the consolidated portion 8 in plan view is a perfect circle, and the dimensions thereof are the same. As long as the effect of the present invention is exhibited, the planar shape of the consolidated portion 8 may be, for example, an elliptical shape, a polygonal shape such as a triangle, or a quadrangle, and the planar shape of the consolidated portions 8 is different. May be. Moreover, the area when the consolidated part 8 is 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 excretory fluid into the absorbent body 4, the high basis weight region in the napkin 1 preferably has a low basis weight region having a lower basis weight than the high basis weight region. . Moreover, it is preferable that the density of the absorbent material contained 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 compacted portion 8. That is, it is preferable that the density of the absorbent material included in the absorbent core in each region is the compacted portion 8> the high basis weight region> the low density region.

  As a material of the absorptive core which comprises the absorber 4, it can comprise including hydrophilic fibers, such as a pulp, and a super absorbent polymer. Moreover, the absorptive core may be comprised only with the hydrophilic fiber. When the hydrophilic fiber is included in the absorbent core, the excretory fluid easily moves from the skin side surface of the absorbent body 4 to the non-skin side surface, and the body fluid easily comes into contact with the core wrap disposed on the non-skin side. As a result, the odor derived from the excreta can be eliminated. The deodorizing effect of the core wrap will be described in detail later.

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

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

  The deodorant contained in the core wraps 41A and 41B itself acts directly on the odor, for example, a substance capable of exhibiting a deodorizing effect by adsorbing, neutralizing or decomposing the odor, and a source of odor. Examples thereof include substances that can exert a deodorizing effect by acting to suppress the generation of odor. Therefore, the former is a deodorant in a narrow sense, and the latter is a deodorant in a broad sense that is a concept including an antibacterial agent.

  As the deodorant used in the present invention, an organic deodorant is preferably used. The organic deodorant can be expected to have high deodorizing properties because of its good affinity with the odor-causing substance when the odor-causing substance in the excretory liquid is organic. Preferred as such a deodorant is a cationic antibacterial agent, and an organic cationic antibacterial agent is particularly preferred from the viewpoint of affinity with organic odor-causing substances and bacteria. Cationic antibacterial agents can suppress the generation of strong rot odor as a control of malodor production. The “organic deodorant” refers to 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. Examples thereof include those described in paragraphs [0015] to [0018] of the specification of JP-A-8-99841. These cationic antibacterial agents may be used alone or in combination of two or more. Cationic antibacterial agents are organic compound-based antibacterial agents, and are more leached into excretory fluids such as urine and have a wider antibacterial action 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, and at least one selected from the group consisting of these are included. Preferably it contains seeds. These cationic antibacterial agents may be used individually by 1 type, and may be used in combination of 2 or more type.

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 malodor production, and can be set as appropriate depending on the application of the article used. For example, in the use of absorbent articles, since it may be in contact with the wearer's skin directly or through excretion fluid for a long time, if the contained basis weight is excessive, the skin irritation is strong. There is a possibility that the influence and the permeability of excreted urine passing through the sheet may be hindered. 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, the content 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 dryer or a cold spray 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, ionization method: ESI). Alternatively, the content of the cationic antibacterial agent can also be measured based on a calibration curve created by a calibration curve method.

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

In Formula (1), R ¹ and R ² represent the same or different methyl group, ethyl group, or a linear or branched alkyl group or alkenyl group 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 formula (1), as a preferable combination of R ¹ and R ² , 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, Examples include a combination 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 alkyl group preferably has 10 to 18 carbon atoms.

Wherein (1), X ^- a monovalent anion represented by is preferably, for example, halide ions or anions active group. The “anionic active group” refers to an ion having an anionic surface active ability.

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

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

A preferable combination of R ³ and R ^{4 includes} a combination 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 adding the benzalkonium salt having an anion active group represented by the formula (2) to the core wraps 41A and 41B, in addition to improving the deodorizing performance, the texture of the paper (bulkyness and flexibility) can be improved. It can be suitably used as a thin paper used for the core wraps 41A and 41B.

  Among the benzalkonium salts, it is more preferable to use benzalkonium cetyl phosphate, particularly in terms of antibacterial properties, safety and high immediate effect. Benzalkonium cetyl phosphate has a good balance between antibacterial properties and low skin irritation (low water solubility) among organic cationic antibacterial agents. As an agent, it is suitably used for sheets for absorbent articles 1 such as core wraps 41A and 41B.

  Examples of other deodorizers 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 particle surface and capable of collecting, adsorbing and / or incorporating a volatilizing odor component into the pores. The porous particles may be used alone as a deodorant or may be used in combination with the above cationic antibacterial agent.

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

  Among these, it is preferable from a viewpoint of improving deodorant performance to contain at least 1 sort (s) chosen from the group which consists of activated carbon, an aluminosilicate compound, and a vinylpyridine copolymer. These porous particles may be used alone or in combination of two or more. 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 a time. Examples of the porous vinylpyridine copolymer include porous styrene-divinylbenzene-vinylpyridine polymer and porous divinylbenzene-vinylpyridine polymer. The silver-supported cancrinite is a cancrinite-like mineral described in paragraphs [0029] to [0045] of JP-A-2005-336363. The term “organic porous particles” refers to particles having a porosity mainly composed of organic compounds, and the term “inorganic porous particles” refers to particles having a porosity mainly composed of inorganic compounds. 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. More preferably, it is 200 m ² / g or more. Further, the upper limit of the BET specific surface area is not particularly limited, but it is practical to set it to 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 is larger in the above range. The BET specific surface area can be measured by a multi-point method using liquid nitrogen using a specific surface area / pore distribution measuring device “ASAP2020” manufactured by Shimadzu Corporation, and the value can be derived within a range in which the parameter C is positive. . Moreover, the mercury intrusion method can be used for the measurement of the pore distribution.

  From the same point of view, 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 50 nm or less. Is more preferable, and it is still more preferable that it is 30 nm or less. The pore diameter 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 a spherical shape, a rod shape having a predetermined aspect ratio, a needle shape, and an indefinite shape such as a pulverized shape. The shape of the fine particles can be determined by observing using a scanning electron microscope “JCM-5100” manufactured by JEOL Ltd.

As specific examples of the porous particles, when using the above-mentioned activated carbon, aluminosilicate compound, and vinylpyridine copolymer, the BET specific surface areas are about 1750 m ² / g, about 250 m ² / g, and 350 m ² /, respectively. g having an average pore diameter of about 4.5 nm, about 20 nm, and about 10 nm can be used.

  The odor component derived from excretory fluids such as urine and menstrual blood to be deodorized is 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, the use of porous particles having an average pore diameter of 2 nm or more as a deodorant can effectively adsorb a plurality of odor components. it can.

  In particular, when porous particles satisfying any one of the above-mentioned suitable numerical ranges of the BET specific surface area or the average pore diameter are used, the content of the porous particles can be reduced while maintaining high deodorizing performance. Therefore, it is preferable. Furthermore, when using porous particles that satisfy a suitable numerical range of both the BET specific surface area and the average pore diameter, the deodorization performance can be further improved and the content of the porous particles can be further reduced. preferable. This combined with the reduction of the content of porous particles by the combination with the cationic antibacterial agent described above, continuous and effective antibacterial action and deodorizing action, improvement of the texture of the core wrap, The feeling of wearing when incorporated in the absorbent article 1 can be improved.

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 preferable. The upper limit is preferably 5 g / m ² or less, more preferably 3 g / m ² or less, and even more preferably 1.0 g / m ² or less, from the viewpoint of suppressing the reduction in the texture of the core wraps 41A and 41B.

  In the case of using activated carbon, an aluminosilicate compound, and a vinylpyridine copolymer, which are specific examples of the porous particles described above, a further deodorizing function can be added by performing a surface treatment. For example, activated carbon can be provided with a deodorizing function by chemisorption to sulfur-based gas by activation of zinc chloride (ZnCl). Further, the aluminosilicate compound can have an antibacterial action by supporting zinc, and the vinylpyridine copolymer can have an antibacterial action by supporting silver.

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

  The pH buffer used in the present invention only needs to contain at least a component that neutralizes either one of the acidic or alkaline odor components, and does not need to neutralize all of the acidic and alkaline odor components at the same time. . For example, when citric acid is used alone as a weak acid, it is possible to neutralize and deodorize odors such as amines and ammonia which are alkaline odor components. 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 occurs secondaryly due to the formation of citrate. In addition, even when sodium citrate, which is a salt of a weak acid, is used alone as a pH buffering agent, or when a mixture of citric acid and citrate is used, the same 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, it is caused by neutralization with acidic odor components. PH buffer action occurs. Thus, in any case described above, the deodorizing effect due to neutralization of the odor component can be effectively obtained.

  In particular, in the napkin 1 of the present embodiment, a pH buffering agent containing citric acid and tris (hydroxymethyl) aminomethane is preferable. In this way, the combination of weak acid and weak base components, including not only odors derived from acidic and alkaline odor components, but also neutral odors that could not be suppressed only by pH buffering deodorants. The odor production can be strongly suppressed. As a result, the absorbent article 1 using the core wrap containing these pH buffering agents is hardly noticed around the wearer, even when the absorbent article 1 is worn for a long time. A high degree of deodorizing effect can be realized.

The basis weight of the pH buffering agent is 0.05 g / m from the viewpoint of neutralizing and deodorizing the odor derived from the acidic or alkaline odor component continuously generated from the excrement liquid of the absorbent article for a long time and effectively. ² or more is preferable, 0.1 g / m ² or more is more preferable, and 0.15 g / m ² or more is more preferable. 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 production 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 preferable.

  The basis weight of the pH buffering agent can be measured using a known ion chromatography analysis method or the like. For example, for analysis of anions such as organic acid and phosphoric acid, alkanolamine, etc., qualitative analysis is performed by Dionex ICS-2100 (manufactured by Thermo Fisher Scientific Co., Ltd., conductivity detector, gradient elution method) as an analyzer. And the content basis weight can be measured.

  The core wrap covers the skin side and the non-skin side of the absorbent core from the viewpoint of reducing the residual amount of odor components on the skin side of the napkin 1 and obtaining a deodorizing effect continuously, and the non-skin side of the absorbent core The core wrap covering the skin preferably contains a cationic antibacterial agent, and the core wrap covering the skin side surface preferably 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 layer absorbent core 40B contains a cationic antibacterial agent, and the core wrap 41A covering the skin side surface of the upper layer absorbent core 40A is water-soluble. The effect of the present invention can be obtained if a pH buffer and porous particles are included. The core wrap 41B covering the skin side surface of the lower layer absorbent core 40B and the core wrap 41A covering the non-skin side surface of the upper layer absorbent core 40A are not particularly limited in the presence or absence of a deodorant, but covers the skin side surface of the lower layer 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 covering the non-skin side surface of the upper absorbent core 40A further includes a cationic antibacterial agent.

  From the viewpoint of broadly and strongly suppressing the generation of odors originating from a variety of odor components and the generation of odor-causing bacteria, the core wraps 41A and 41B of the absorbent body 4 include the above-described cationic antibacterial agents, porous It is preferred to use one that contains all of the particles and pH buffer. Among these, 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 deodorant into the core wrap is not particularly limited. When an organic deodorant and / or a pH buffering agent is included as a deodorant, the core wrap is prepared by, for example, applying a deodorant dissolved and mixed in water or an organic solvent to the core wrap, spraying or dipping, and drying. Can be contained. Moreover, when using porous particle | grains as a deodorizing agent, it can be made to contain in a core wrap by making a porous particle adhere to the hydrophilic fiber which is a constituent fiber of a core wrap.

  By wearing the absorbent article 1 having the above configuration, it is possible to effectively suppress the odor caused by the excretory liquid and to obtain a deodorizing effect continuously. The following mechanisms can be considered as a mechanism for obtaining a sustained deodorizing effect.

  Compared with the parts of the absorbent cores 40A and 40B other than the compacted part 8, the compacted part 8 shown in FIGS. The excretory fluid absorbed by the compacted portion 8 is likely to smoothly move to the bottom 82 side that is the non-skin surface side of the absorber 4 according to gravity. Since the bottom part 82 including the core wrap on the non-skin side exists below the compacted part 8, the excretion fluid is easily transferred to the non-skin side through the core wrap. As a result of the excretion fluid coming into contact with the deodorant present in the core wrap on the non-skin side surface, the deodorization effect of the excretion fluid can be expressed from the early stage of wearing the absorbent article 1. Moreover, since the deodorization is performed at a position far from the skin surface of the napkin 1, the deodorizing effect is enhanced. Further, since the excretory fluid is distributed into the portion that moves to the core wrap on the non-skin side via the compacted portion 8 and the portion that diffuses the absorbent core in the surface direction and the thickness direction, a large amount of the excretory fluid is not absorbed at a time. It becomes difficult to reach the core wrap on the skin side. For this reason, the deodorizing effect is easy to maintain over a long period of 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 excretory liquid directly contacts the core wrap 41 on the skin side and exhibits a deodorizing effect. In addition, since the core wrap 41 on the non-skin surface side and the excretory liquid easily come into contact with each other at the bottom portion 82, the excretory liquid easily comes 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 odor-causing bacteria can be suppressed, and generation of odor-causing substances is generated. Is preferable. In particular, since the antibacterial agent is included in the core wrap 41 on the non-skin side, it becomes easy to come into contact with the core wrap 41 on the non-skin side existing in the bottom 82, and the generation of odor-causing substances can be suppressed. Furthermore, even when the excretory fluid is held or accumulated on the non-skin side of the absorbent body 4 through the compaction part 8 for a long time, generation of odor-causing substances can be suppressed in the non-skin-side core wrap 41 other than the bottom part 82. Therefore, it is preferable.

  Further, when the cationic antibacterial agent is contained in the core wrap 41 on the non-skin surface side, and the water-soluble pH buffer and porous particles are contained in the core wrap 41 on the skin surface side, excretion on the skin side surface. The porous particles in contact with the liquid adsorb the odorous component, and the pH buffer agent dissolves in the excretory liquid and neutralizes the odorous component, and reaches the core wrap 41 on the non-skin surface side through the compacted portion 8. As a result, the residual amount of odorous components particularly on the skin side can be reduced, and a deodorizing effect can be obtained continuously.

  As shown in the embodiment shown in FIG. 2, when two absorbent bodies in which the absorbent core is covered with the core wrap are laminated, the excretory fluid that has moved to the non-skin side via the compacted portion 8 and the bottom portion 82. However, since it is easy to diffuse in the surface direction between each layer, excretory fluid and a deodorant can contact in a wider area. As a result, the deodorizing performance can be maintained for a long time.

  In addition, the excretion fluid permeates from the core wrap 41B located at the bottom portion 82 of the compacted portion 8 and easily shifts to the lower layer absorbent body 4B existing on the non-skin side surface. As a result, a deodorizing effect can be expected over both the core wrap 41A covering the skin side surface of the absorbent body 4 and the core wrap 41B covering the non-skin side surface, and the deodorization is easily performed at a position far from the skin. In addition, since the excretion fluid easily moves to the non-skin side surface of the absorbent body 4 through the compacted portion 8, excessive retention of the excretion fluid on the skin side surface of the absorbent body 4 is suppressed, and the excretion fluid is absorbed by the upper layer absorbent body 4A and the lower layer. Since it is appropriately distributed with the body 4B, the deodorizing effect of the core wrap 41A on the skin side is maintained, and even if the absorbent article 1 is worn for a long time, the deodorizing effect is easily obtained.

  If the density of the high basis weight region of the absorbent body 4 is higher than the low basis weight region having a lower basis weight than the high basis weight region located around the high basis weight region, the excretion fluid is preferentially discharged from the high basis weight region. It becomes easy to be absorbed. Since the portion other than the compacted portion 8 in the high basis weight region has a structure having a density lower than that of the consolidated portion 8, the absorption of excretory fluid from the consolidated portion 8 is particularly fast, and the core wrap 41 existing in the bottom portion 82. It becomes easier to suppress the generation of odor on the skin side by contact with the excretory fluid.

  Next, other embodiment (2nd Embodiment) of the absorbent article 1 of this invention is 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 appropriately applied to points that are not particularly described. 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 absorbent body 4. The absorbent body 4 is composed of an absorbent core 40 and a core wrap 41 that wraps the absorbent core 40, and is sandwiched between the skin sheet 2 on which the unevenness is arranged on the skin surface 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 a peripheral seal portion 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 the skin sheet 2 and the non-skin surface as in the first embodiment. The sheet 3 may be directly joined to form the peripheral seal portion.

  In the napkin 1 shown in FIG. 3, the cavity 4 is formed in the absorbent body 4 so as to protrude from the non-skin side surface of the core wrap 41 toward the skin side surface, and corresponds to the upper part of the bottom 82 formed by the cavity portion 81. It has the consolidated part 8 into which the absorbent material of the absorbent core 40 was compressed. Moreover, the absorber 4 has the hollow part 83 recessed toward the non-skin side surface from the skin side surface of the absorber 4 in the position which overlaps with the compaction part 8 in the thickness direction. That is, the consolidated portion 8 is formed between the bottom portion 82 formed by the cavity portion 81 and the recess portion 83.

  The compaction part 8, the cavity part 81, and the bottom part 82 can be formed by embossing the absorber 4 from the non-skin side to the skin side, as in the first embodiment. In this case, the recessed part 83 can be formed in the position corresponding to the compaction part 8 by adjusting suitably the conditions which give pin embossing, the basic weight of an absorptive core, etc. FIG.

  In the second embodiment, as shown in FIG. 3, the compacted portion 8 and the recessed portion 83 are provided at only one place in the center in the width direction Y, but a plurality are formed at predetermined intervals in the longitudinal direction X. May be.

  As described above, when the dent portion 83 is provided on the skin surface side of the absorbent body 4, the excretion liquid is guided to the dent portion 83 according to gravity, and can be more easily absorbed by the compacted portion 8. Moreover, when pressure (force applied to the thickness direction of the surface sheet 2) is applied to the skin sheet 2 due to a state in which the wearer is seated when the napkin 1 is worn, the recessed portion 83 is less likely to be compressed than other portions. Moreover, the effect that the state in which the excretion fluid can easily enter the compacted portion 8 can be maintained. Due to the induction of the excretion liquid into the compacted part 8 by the depression 83, the contact efficiency between the excretion liquid and the core wrap 41 and the deodorant contained in the core wrap 41 can be further increased. The deodorizing effect by the deodorant which can be demonstrated can be exhibited suitably.

  As shown in FIG. 3, the napkin 1 in the second embodiment is pressed from the skin sheet 2 side of the absorbent body 4 to the non-skin sheet 3 side on both sides of the compacted portion 8 in the lateral direction Y in the intermediate portion 1B. A pair of pressing portions 5 and 5 may be provided. When the pressing part 5 is provided, the excretion liquid is easily guided to the non-skin side surface of the absorber 4 by the compaction part 8, and the non-skin side surface of the absorber 4 is also caused by the depression of the pressing part 5. It becomes easy to be guided to. In the pressing part 5, since the bottom part 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 side of the absorbent body 4, similarly to the compacted part 8.

  In particular, the pressing portion 5 in the second embodiment is formed as a leak-proof groove 5 that extends in the longitudinal direction X across the front portion 1A, the intermediate portion 1B, and the rear portion 1C, as in the embodiment shown in FIG. If so, the excretory liquid guided to the non-skin side of the absorbent body 4 at the intermediate portion 1B is deodorized while diffusing in the vertical direction X along the leak-proof groove 5, so that the contact between the core wrap 41 and the excretory liquid It is possible to more effectively suppress the generation of odor due to the above.

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

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the first embodiment, the compaction portion 8 is formed only in the high basis weight region, but in addition to or instead of this, the compact portion is formed in the low basis weight region located around the high basis weight region. 8 may be formed.

  In the second embodiment, the compacted portion 8 is formed only at one central portion with respect to the width direction. Alternatively, a plurality of the consolidated portions 8 may be formed at intervals in the width direction.

  Moreover, although the skin sheet of the napkin 1 in 2nd Embodiment had the unevenness | corrugation in the surface, it may replace with this and may use the skin sheet which has a flat surface. Moreover, you may apply the skin sheet which has an unevenness | corrugation on the surface to the napkin 1 of 1st Embodiment.

  Each of the above embodiments relates to a napkin as the absorbent article 1. However, the present 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 absorbent article which can exhibit deodorant performance continuously can be provided.

Claims (17)

A skin sheet, a non-skin sheet, and an absorbent body arranged between these sheets, are located in the front part, the rear part, and the middle along the longitudinal direction corresponding to the front and rear direction of the wearer, An absorbent article comprising an intermediate part including a region that contacts the excretion part of the wearer,
The absorbent body has an absorbent core and a core wrap that covers the non-skin side of the absorbent core;
The absorbent body has an opening on the non-skin side thereof, and includes a cavity portion having a bottom portion on the skin side, and the bottom portion constitutes a consolidated portion where the density of the absorbent core is high,
The said core wrap is an absorbent article containing the deodorizer.   The absorptive article according to claim 1 in which said core wrap covering the skin side of said absorptive core is arranged.   The absorptive article according to claim 1 or 2 in which said compaction part exists in said middle part of said absorber.   The absorbent article according to claim 3, wherein the intermediate portion includes a plurality of the consolidated portions.   The absorbent article according to any one of claims 1 to 4, wherein the deodorant includes an organic deodorant.   The absorbent article according to claim 5, wherein the organic deodorant is a cationic antibacterial agent.   The absorbent article according to claim 6, wherein the core wrap further includes porous particles as the deodorant.   The absorbent article according to claim 6 or 7, wherein the core wrap further contains a water-soluble pH buffer as the deodorant.   The core wrap covers the skin side and non-skin side of the absorbent core, the core wrap covering the non-skin side of the absorbent core contains the cationic antimicrobial agent, and the core wrap covering the skin side is the water-soluble pH. The absorbent article of Claim 8 containing a buffer and the said porous particle.   The said absorber is equipped with the high basic weight area | region where the basic weight is higher than the peripheral part in the said intermediate part, and has the said compaction part in this high basic weight area | region. The absorbent article according to item 1.   The absorptive article according to claim 10 in which said high basic weight field is a middle-high part which protruded toward the skin side rather than said peripheral part.   The high basis weight region is higher in density than a low basis weight region having a lower basis weight than the high basis weight region located around the high basis weight region, and is lower in density than the consolidated portion. Or the absorbent article of 11.   The high basis weight region has a structure in which an upper layer absorber positioned on the skin sheet side and a lower layer absorber positioned on the non-skin sheet side are laminated, and the skin side surface of the upper layer absorber and The absorbent article according to any one of claims 9 to 12, wherein a non-skin side surface, and a skin side surface and a non-skin side surface of the lower layer absorbent body are covered with the core wrap.   The absorptive article according to claim 13 in which said compaction part extends from said non-skin side core wrap of said lower layer absorber to said upper layer absorber.   The press part pressed from the said skin surface sheet side of the said absorber to the said non-skin surface sheet side is provided in the both sides of the said consolidated part regarding the horizontal direction which cross | intersects the said vertical direction in the said intermediate part. The absorbent article of any one of -14.   The absorbent article according to claim 15, wherein the pressing portion extends in the longitudinal direction across the front portion, the intermediate portion, and the rear portion.   The absorbent article of any one of Claims 1-16 which has a hollow part which becomes depressed toward the non-skin side surface from the skin side surface of the said absorber in the position which overlaps with the said consolidation part in the thickness direction.

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