JP2022067903A - Underpants-type absorbent article - Google Patents

Abstract

To provide an underpants-type absorbent article that ensures liquid permeation and prevents liquid return, and markedly suppresses propagation of germs and occurrence of ammonia odor even when body fluid remains on the top sheet.SOLUTION: An underpants-type absorbent article has a ventral band member 30 of a ventral part 13, a dorsal band member 40 of a dorsal part 15, a crotch band member 50 of a crotch part 14 therebetween, and a waist opening 11 and a leg opening 12 formed by joining together respective both ends of the ventral band member 30 and the dorsal band member 40. An absorbable body 20 has both ends in a longitudinal direction joined to the skin side faces of the ventral band member 30 and the dorsal band member 40. The ventral band member 30, dorsal band member 40 and crotch band member 50 each include an interior nonwoven fabric sheet, an exterior nonwoven fabric sheet and a plurality of elastic stretching members. The top sheet 21 of the absorbable body 20 has a first fiber layer 211 including durable hydrophilic fibers, and a second fiber layer 212 including general hydrophilic fibers and antibacterial fibers. The durable hydrophilic fibers, general hydrophilic fibers, and antibacterial fibers each have a predetermined basis weight in the underpants-type absorbent article.SELECTED DRAWING: Figure 2

Description

The present invention relates to a pants-type absorbent article.

In recent years, there has been an extremely high need for imparting antibacterial and deodorant functions to absorbent articles such as disposable diapers, mild incontinence products and pet sheets. The antibacterial function suppresses the growth of various germs such as ammonia-producing bacteria after urination, for example. From such needs, various absorbent articles having an antibacterial function and / or a deodorant function have been proposed.

Patent Document 1 discloses an absorbent article in which an absorbent body is wrapped with a carrier sheet coated with a deodorant or an antibacterial agent, and the entire body is wrapped with a surface sheet (claims 1 and 7).

Patent Document 2 describes an absorber containing a surface material on the side in contact with the skin, which comprises a synthetic fiber containing a zeolite carrying a silver ion, a copper ion, or a zinc ion, and a fiber having the zeolite and a deodorant. A omelet with a corresponding internal fiber sheet and a highly absorbent polymer inner layer is disclosed (claim 1). As the synthetic fiber containing zeolite, polyethylene terephthalate fiber, polyethylene fiber, polypropylene fiber and the like are used (paragraph 0007). Further, as the fiber constituting the internal fiber sheet, polyester fiber or the like is used (paragraph 0009).

Patent Document 3 describes antibacterial cellulose fibers (trade name: Sergaia (registered trademark), manufactured by Rengo Co., Ltd.) in which zeolite is carried inside the cellulose fibers and Ag, Cu, etc. are carried in the zeolite, and the antibacterial. Textiles, non-woven fabrics and papers containing sex cellulose fibers are disclosed. For example, the paper itself can be provided with a deodorizing function by making paper from the cellulose fibers. Further, it is described that the woven fabric, non-woven fabric or paper containing the cellulose fiber can be used as a material for disposable diapers (paragraph 0018).

Patent Document 4 describes a top sheet, a back sheet, an absorber arranged between them, an area between the absorber and the back sheet, and a space between the top sheet and the back sheet around the absorber. Disclosed is an absorbent article comprising a hydrophilic deodorant sheet arranged in the region of the above, wherein the hydrophilic deodorant sheet contains the antibacterial cellulose fiber described in Patent Document 3 (Claim 1, paragraph). 0026).

JP-A-2004-089322 (Claim 1, Claim 7) Japanese Patent Application Laid-Open No. 05-16671 (Claim 1, paragraph 0007, 0009) Japanese Patent No. 4149066 (Claim 1, paragraph 0018) JP-A-2008-48775 (Claim 1, paragraph 0026)

Recent absorbent articles are required to absorb the excretion of body fluids multiple times, and since there are many opportunities to wear one absorbent article for a long time, it is considered that the environment is such that various germs can easily propagate. .. In particular, people requiring long-term care who excrete a relatively large amount of body fluid often wear pants-type disposable diapers (pants-type absorbent articles). Since it is exposed to the wearer's body temperature, it becomes easy to form an environment in which the growth of various germs and the generation of offensive odors such as ammonia odor are promoted. Although the absorbent articles described in Patent Documents 1 to 4 are provided with a certain antibacterial function, the top sheet that comes into contact with the skin of the wearable person does not contain an antibacterial agent. Therefore, the antibacterial action (such as the action of suppressing bacterial growth) cannot be effectively exerted on the body fluid remaining on the top sheet.

The present invention has been made in view of the above problems, and an object of the present invention is excellent in liquid permeability and liquid returnability, and even if body fluid remains on the top sheet, germs propagate and ammonia odor is generated. Is to provide a pants-type absorbent article in which is significantly suppressed.

In view of the above problems, the present inventors have conducted diligent research. As a result, the present inventors have found that the top sheet has two fiber layers containing antibacterial fibers, the first fiber layer located on the skin side of the top sheet contains durable hydrophilic fibers, and the top sheet is non-skin. The present invention has been found that the second fiber layer located on the side contains antibacterial fibers and general hydrophilic fibers, and the above problems can be solved by arranging the first fiber layer and the second fiber layer in a specific ratio. Has been completed. The present invention relates to the following pants-type absorbent articles.

(1) The first aspect of the present invention is a ventral band member arranged on the ventral side of the wearer, a dorsal band member arranged on the dorsal part of the wearer, the ventral band member and the back. A crotch band member that is interposed between the side band members and is arranged on the crotch of the wearer to support the absorbent body, and both widthwise ends of the ventral band member and both widthwise ends of the dorsal band member. A pants-type absorbent article comprising a waist opening and a leg opening formed by joining with.
The absorbent body includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the top sheet and the back sheet, and both ends in the longitudinal direction are the antinodes, respectively. It is joined to the skin side surface of the side band member and the skin side surface of the dorsal band member.
The ventral band member, the dorsal band member, and the crotch band member are between an interior nonwoven fabric sheet located on the skin side surface side and an exterior nonwoven fabric sheet located on the non-skin side surface, and between the interior nonwoven fabric sheet and the exterior nonwoven fabric sheet. With multiple elastic elastic members arranged in,
The top sheet comprises a first fiber layer containing durable hydrophilic fibers and a second fiber layer adjacent to the non-skin contact surface of the first fiber layer and containing general hydrophilic fibers and antibacterial fibers. The skin contact surface of the first fiber layer constitutes the skin contact surface of the top sheet, and the non-skin contact surface of the second fiber layer constitutes the non-skin contact surface of the top sheet.
The basis weight of the durable hydrophilic fiber in the first fiber layer is 3 g / m ² or more and 15 g / m ² or less, and the basis weight of the general hydrophilic fiber in the second fiber layer is 7 g / m ² or more and 25 g / m /. It is a pants-type absorbent article characterized in that it is m ² or less and the basis weight of the antibacterial fiber is 1 g / m ² or more and 6 g / m ² or less.
However, the general hydrophilic fiber and the durable hydrophilic fiber are when 100 μL of 0.9% saline solution is dropped every 30 seconds at the same position of the air-through nonwoven fabric having a basis weight of 20 g / m ² containing the fiber. , The dropped saline solution is defined by the hydrophilicity evaluation by observing the number of times of dropping when the dropped saline does not permeate into the air-through non-woven fabric and becomes droplets on the air-through non-woven fabric, and the hydrophilicity evaluation is performed once or more and eight times. The fiber contained in the air-through nonwoven fabric described below is referred to as a general hydrophilic fiber, and the fiber contained in the air-through nonwoven fabric having a hydrophilicity evaluation of 9 times or more is referred to as a durable hydrophilic fiber.
(2) The second aspect of the present invention is the pants-type absorbent article according to (1), wherein the top sheet is an air-through nonwoven fabric.
(3) The third aspect of the present invention is the pants-type absorbent article according to (1) or (2), wherein the top sheet has a basis weight of 18 g / m ² or more and 30 g / m ² or less. It is characterized by being.
(4) A fourth aspect of the present invention is the pants-type absorbent article according to any one of (1) to (3), wherein the absorbent body is between the top sheet and the absorbent body. It further comprises an absorbent covering sheet to be arranged, characterized in that the absorbent covering sheet contains pulp fibers.
(5) A fifth aspect of the present invention is the pants-type absorbent article according to any one of (1) to (4), wherein the durable hydrophilic fiber contained in the first fiber layer is a castor oil derivative. The general hydrophilic fiber contained in the second fiber layer is treated with an anionic surfactant.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a pants-type absorbent article that is excellent in liquid permeability and liquid returnability, and even if body fluid remains on the top sheet, the growth of germs and the generation of ammonia odor are remarkably suppressed. ..

It is a schematic perspective view which shows the appearance of the pants type absorbent article which concerns on 1st Embodiment of this invention. It is a schematic development view of the pants type absorbent article shown in FIG. FIG. 2 is a schematic cross-sectional view in the width direction of the pants _- type absorbent article at the X1 _- X1 cutting line shown in FIG. It is a schematic cross-sectional view in the width direction which shows the deformation example of the absorbent body. It is a schematic cross-sectional view which shows the structure of a top sheet.

In the present specification, wearing the pants-type absorbent article means a state in which the pants-type absorbent article is worn on the body before and after the absorption of body fluid. In the pants-type absorbent article, the longitudinal direction is the direction indicated by Y in the figure extending to the front and back of the body through the crotch portion of the wearer when the pants-type absorbent article is worn on the body, and the width direction is the length. It is the direction indicated by X in the figure orthogonal to the vertical direction, and the thickness direction is the direction indicated by Z in the figure in which the constituent members are laminated. The skin contact surface (hereinafter, also simply referred to as "skin surface" or "skin side surface") is a surface of the front and back surfaces of each member such as an absorber that is arranged on the wearer's skin side when worn. , The non-skin contact surface (hereinafter, also simply referred to as "non-skin surface" or "non-skin side surface") is the front and back surfaces of each member such as an absorber, which is opposite to the wearer's skin side when worn. It is the side to be directed. Body fluid refers to the liquid excreted from the body such as urine, blood, and water in loose stool.

<Pants type absorbent article>
Hereinafter, the pants-type absorbent article 1 of the present embodiment will be described with reference to the drawings. 1 and 2 show a schematic perspective view showing the appearance of the pants-type absorbent article 1 and a schematic development view. FIG. 3 is a cross _- sectional view taken along the line X1 _- X1 of the absorbent body 20 of FIG. 2, and FIG. 4 shows the absorbent body 26 of another embodiment. FIG. 5 shows the top sheet 21. These drawings do not specify the shape, dimensions, size relationship, etc. of each component in the pants-type absorbent article 1.

As shown in FIG. 1, the pants-type absorbent article 1 mainly abuts on the ventral band member 30 arranged so as to mainly abut on the ventral portion 13 of the wearer and the dorsal portion 15 of the wearer. The dorsal band member 40 is arranged so as to be interposed between the ventral band member 30 and the dorsal band member 40 so as to be mainly in contact with the wearer's crotch portion 14 to support the absorbent body 20. It includes a crotch band member 50, a waist opening 11 formed by joining both ends of the ventral band member 30 in the width direction and both ends of the dorsal band member 40 in the width direction, and a pair of leg openings 12. .. Here, the absorbent body 20 has an elongated shape in the front-rear direction that covers the crotch portion 14 of the wearer from the front-back of the body. The waist opening 11 is located above the ventral portion 13 and the dorsal portion 15, and the pair of leg openings 12 are formed on the left and right sides of the crotch portion 14 between the ventral portion 13 and the dorsal portion 15. .. In the present embodiment, the pants-type absorbent article 1 is composed of an integrated exterior body from the ventral band member 30 to the dorsal band member 40 via the crotch band member 50, but the present invention is not limited to this. , The ventral band member 30 and the dorsal band member 40 may be separated from each other, and these may be connected by the absorbent body 20 to be integrated into the pants-type absorbent article 1.

Further, the top sheet 21 in the absorbent body 20 includes a first fiber layer 211 located on the wearer's skin side and a second fiber layer 212 located on the wearer's non-skin side. The first fiber layer 211 mainly contains durable hydrophilic fibers, and the second fiber layer 212 mainly contains antibacterial fibers and general hydrophilic fibers. According to the present embodiment, by arranging the first fiber layer 211 and the second fiber layer 212 having each of the above-mentioned configurations in a predetermined ratio, the body fluid permeability of the absorbent main body 20 is improved and the antibacterial property is improved. Excellent, even if the body fluid remains on the top sheet 21, it is possible to obtain a pants-type absorbent article in which the growth of germs and the generation of ammonia odor are remarkably suppressed.

Hereinafter, each component will be described in more detail in the order of the ventral band member 30, the dorsal band member 40, the crotch band member 50, and the absorbent main body 20.

<Ventral band member, dorsal band member and crotch band member>
The ventral band member 30 and the dorsal band member 40 are formed by stacking a plurality of non-woven fabrics from the non-skin surface side on the front end portion (ventral end portion) and the rear end portion (dorsal end portion) of the absorber body 20. It is a thing. Further, the crotch band member 50 is interposed between the ventral band member 30 and the dorsal band member 40, and is similarly formed by stacking a plurality of non-woven fabrics from the non-skin surface side.

In the present embodiment, the ventral band member 30, the dorsal band member 40, and the crotch band member 50 are located on the non-skin side of the wearer and the exterior non-woven fabric sheets 301, 401, 501, respectively, on the skin side of the wearer. The interior nonwoven fabric sheets 302, 402, and 502 are provided, and a plurality of elastic stretchable members (not shown) arranged at predetermined positions between them.
The exterior nonwoven fabric sheets 301, 401, 501 and the interior nonwoven fabric sheets 302, 402, 502 are folded in half along the center line of the absorber body 20 so that the absorber body 20 is inside, and the ventral side portion 13 and the dorsal side portion are formed. Both side edges of 15 are connected with overlapping portions. As a result, the exterior nonwoven fabric sheets 301, 401, and 501 form the elastic waist opening 11 and the pair of leg openings 12, and the pants-type absorbent article 1 is configured into a detachable pants shape as a whole. .. When the pants-type absorbent article 1 is worn, the ventral portion 13 covers the lumbar region on the ventral side of the wearer, and the dorsal portion 15 covers the lumbar region on the back side of the wearer.

Interior non-woven fabric sheets 302, 402, and 502 are laminated inside the exterior non-woven fabric sheets 301, 401, and 501 to increase the strength of the ventral band member 30 and the dorsal band member 40. As the exterior nonwoven fabric sheets 301, 401, 501 and the interior nonwoven fabric sheets 302, 402, 502, a nonwoven fabric containing fibers made of a thermoplastic resin such as polypropylene, polyester, or polyethylene can be used. Specific examples of the non-woven fabric include thermal bonded non-woven fabric, air-through non-woven fabric, spun-bonded non-woven fabric and the like. Among these, air-through non-woven fabric, spunbonded non-woven fabric and the like are preferable. The basis weight of the non-woven fabric is, for example, in the range of 18 g / m ² or more and 40 g / m ² or less.

The longitudinal dimension of the interior nonwoven fabric sheet 302 of the ventral band member 30 is, for example, in the range of 40 mm or more and 80 mm or less, and the longitudinal dimension of the interior nonwoven fabric sheet 402 of the dorsal band member 40 is, for example, in the range of 50 mm or more and 100 mm or less. be. The interior nonwoven fabric sheet 302 of the ventral band member 30 and the absorber body 20 overlap in the longitudinal dimension, for example, in the range of 20 mm or more and 30 mm or less, and the interior nonwoven fabric sheet 402 of the dorsal band member 40 and the absorber body 20 have the longitudinal dimension. For example, they overlap in a range of 20 mm or more and 40 mm or less. By setting the dimensions of the interior non-woven fabric sheets 302, 402, and 502 within the above range, the breathability of the pants-type absorbent article 1 and the feel of the non-woven fabric sheet are good, including the area of the back side portion 15. It becomes a thing.

<Elastic elastic member>
The pants-type absorbent article 1 includes exterior non-woven fabric sheets 301, 401, in predetermined areas such as the peripheral edge of the waist opening 11, the peripheral edge of the leg opening 12, the ventral side portion 13, the dorsal side portion 15, and the crotch portion 14. A plurality of elastic elastic members (not shown) are arranged between the 501 and the interior nonwoven fabric sheets 302, 402, 502, and are joined to the exterior nonwoven fabric sheets 301, 401, 501 and the interior nonwoven fabric sheets 302, 402, 502. .. The elastic stretchable member is joined to the bottom of the uneven embossed pattern of the interior nonwoven fabric sheets 302, 402, and 502 in a stretched state, for example. According to this configuration, while the pants-type absorbent article 1 is worn, folds are formed on the interior nonwoven fabric sheets 302, 402, and 502 along the embossed pattern of the unevenness, and the wearer and the pants-type absorbent article 1 are formed. Since the gap is maintained between the interior nonwoven fabric sheets 302, 402, and 502 of No. 1, the air permeability of the pants-type absorbent article 1 is well maintained. It is preferable that the interior nonwoven fabric sheets 302, 402, 502 and the elastic elastic member are adhered to each other via, for example, a hot melt adhesive interposed only in the elastic elastic member. As the elastic member constituting the elastic elastic member, any elastic member commonly used in this field can be used, and examples thereof include thread-like, string-like, and flat-shaped elastic members such as natural rubber, synthetic rubber, and polyurethane. The thickness is, for example, in the range of 620 dtex or less.

<Absorbable body of the first embodiment>
As shown in FIG. 3, the absorbent main body 20 has a top sheet 21, an absorber 22, and a back sheet 23 laminated from the skin side to the non-skin side as basic units. The absorbent body 20 of the present embodiment has a pair of three-dimensional gathers 24 extending in the longitudinal direction near both ends of the skin side surface of the top sheet 21 in the width direction, if necessary. Various known modifications can be applied to the absorbent body 20. Hereinafter, the configuration of each member will be described in more detail in the order of the top sheet 21, the absorber 22, the back sheet 23, and the three-dimensional gather 24.

<Top sheet>
As shown in FIG. 5, the top sheet 21 includes a first fiber layer 211 located on the skin side of the wearer and a second fiber layer 212 located on the non-skin side of the wearer. Therefore, the skin side surface of the first fiber layer 211 becomes the skin side surface of the top sheet 21, and the non-skin surface of the second fiber layer 212 becomes the non-skin side surface of the top sheet 21. The first fiber layer 211 contains durable hydrophilic fibers, and the second fiber layer 212 contains antibacterial fibers and general hydrophilic fibers. The first fiber layer 211 may be made of a durable hydrophilic fiber, and may contain other fibers together with the durable hydrophilic fiber as long as the effect of the water resistant hydrophilic fiber is not impaired. The second fiber layer 212 may be composed of general hydrophilic fibers and antibacterial fibers, and may contain other fibers as long as the effects of these fibers are not impaired. Examples of the above-mentioned other fibers in the first fiber layer 211 and the second fiber layer 212 include synthetic fibers made of synthetic resin such as polypropylene and polyethylene, regenerated fibers such as rayon, and natural fibers such as cotton and cellulose fibers. One kind or two or more kinds are mentioned.

As the first fiber layer 211 and the second fiber layer 212, for example, a base material in the form of a sheet, a film or the like can be used. Specific examples of the base material include, from the viewpoint of liquid permeability, for example, non-woven fabrics such as air-through non-woven fabrics, thermal bonded non-woven fabrics and spunbonded non-woven fabrics, composite non-woven fabrics such as thermal-bonded non-woven fabrics / spunbonded non-woven fabric laminates, urethane foams and the like. Examples thereof include a foamed film and a composite sheet which is a laminate of two or more of these. Among these, a non-woven fabric is preferable, and an air-through non-woven fabric is more preferable from the viewpoint of liquid permeability.

The surfaces of the first fiber layer 211 and the second fiber layer 212 may be embossed or perforated according to a known method in order to improve the liquid permeability. In addition, the first fiber layer 211 and the second fiber layer 212 are one or more of lotions, antioxidants, anti-inflammatory components, pH adjusters, moisturizers, etc. from the viewpoint of reducing irritation to the skin. May be contained. An organic acid such as citric acid, glutamic acid, or malic acid may be applied to the top sheet 21 as a weakly acidic chemical solution to the extent that the water absorption performance is not impaired.

The durable hydrophilic fiber contained in the first fiber layer 211 and the general hydrophilic fiber contained in the second fiber layer 212 are defined based on the results of the following hydrophilicity test.
(Hydrophilicity test)
An air-through nonwoven fabric having a basis weight of 20 g / m ² is prepared using hydrophilic fibers, and 100 μL of 0.9% saline solution is dropped every 30 seconds at the same position on the obtained air-through nonwoven fabric. Then, the dropped saline solution does not permeate into the air-through nonwoven fabric, and the number of drops formed into droplets on the air-through nonwoven fabric is measured. The hydrophilic fiber contained in the air-through nonwoven fabric having a dropping frequency of 1 to 8 times is referred to as a general hydrophilic fiber, and the hydrophilic fiber contained in the air-through nonwoven fabric having a dropping frequency of 9 times or more is referred to as a durable hydrophilic fiber.

Durable hydrophilic fibers and general hydrophilic fibers are obtained by treating natural fibers and synthetic fibers with a predetermined hydrophilic treatment agent to impart predetermined hydrophilicity, respectively. Here, the treatment with the hydrophilization treatment agent is, for example, a method of adding the hydrophilization treatment agent to the synthetic resin and spinning the synthetic resin, the hydrophilization treatment agent being water, an organic solvent, or a mixture of water and an organic solvent. A method of immersing a natural fiber or a synthetic resin in a hydrophilization treatment solution obtained by dissolving or dispersing in an appropriate solvent such as a solvent for a predetermined time and drying the natural fiber or the synthetic resin. Examples thereof include a method of applying a hydrophilization treatment solution obtained by dissolving or dispersing in an appropriate solvent such as water, an organic solvent, or a mixed solvent of water and an organic solvent. The natural fiber is not particularly limited, and examples thereof include cotton fiber and cellulose fiber. The synthetic fiber is not particularly limited, and examples thereof include polyester fiber, polyester fiber such as polyethylene terephthalate (PET) fiber, polyethylene fiber, and polyolefin fiber such as polypropylene fiber. Further, a fiber spun from a hydrophilic resin described later may be used.

Examples of the hydrophilizing agent used for general hydrophilic fibers include anionic surfactants such as sodium lauryl sulfonic acid salt and potassium lauryl phosphate ester. Among these, lauryl phosphate potassium salt is preferable from the viewpoint of hydrophilicity. Examples of the treatment agent used for the durable hydrophilic fiber include castor oil derivative. Specific examples of the castor oil derivative include polyoxyalkylene chain adducts of natural fats and oils such as castor oil and hardened castor oil, fatty acid esters thereof, polyoxyethylene stearyl ether, water-soluble modified silicon and the like. Among these, polyoxyethylene hydrogenated castor oil is preferable from the viewpoint of productivity.

The antibacterial fiber contained in the second fiber layer 212 is not particularly limited as long as it is a fiber having antibacterial properties and suitable for the material of the absorbent article 1, but is a metal ion exhibiting antibacterial properties inside and / or on the surface. The fiber carrying the above is preferable. A metal compound containing a metal ion may be supported on an inorganic porous body and used. Examples of the supporting method include physical adsorption, chemical adsorption, ion exchange, thin film deposition, surface thin film formation, and mechanical support. The metal ion exhibiting antibacterial activity is not particularly limited, and examples thereof include ions such as silver, copper, and zinc. Among these, silver ions that exert an antibacterial effect even in a very small amount are preferable. Examples of the inorganic porous body include zeolite, hydrotalcite, hydroxyapatite, clay minerals, alumina, silica, bentonite and the like. Further, an antibacterial organic compound (antibacterial agent) may be used. The antibacterial agent is not particularly limited, and examples thereof include hinokitiol, cetylpyridinium chloride, chlorhexidine gluconate, isopropylmethylphenol, benzalkonium chloride, chlorhexidine hydrochloride, benzethonium chloride, and triclosan. The antibacterial metal ion and the antibacterial agent can be used individually by 1 type or in combination of 2 or more types, respectively. Hereinafter, antibacterial metal ions and antibacterial agents may be collectively referred to as antibacterial components.

The antibacterial fiber is, for example, a method of immersing and drying the fiber in an antibacterial solution containing one or more of the antibacterial components or a dispersion liquid to fix the antibacterial component on the fiber surface, and applying the antibacterial solution to the fiber surface. It can be produced by a method of applying and drying to fix an antibacterial component on the fiber surface, a method of adding one or more of the antibacterial components to a synthetic resin in a molten state, and then spinning the synthetic resin. Here, examples of the fiber include cellulose fiber and synthetic fiber. Specific examples of the cellulose fiber include, for example, natural cellulose fiber such as pulp fiber, cotton fiber, linen fiber, and kenaf fiber, ethyl cellulose-containing fiber, hydroxyethyl cellulose-containing fiber, hydroxypropyl cellulose-containing fiber, methyl cellulose-containing fiber, and ethyl hydroxyethyl cellulose-containing fiber. Examples thereof include fibers, chemically modified cellulose-containing fibers such as carboxymethyl cellulose-containing fibers, and regenerated cellulose fibers. Examples of synthetic fibers include synthetic fibers spun from hydrophilic resins such as polyacrylamide, polyvinyl alcohol, crosslinked polyvinyl alcohol, chitin, chitosan, ethylene vinyl acetate copolymer, and polyvinyl formal, polyester fibers, and polyethylene terephthalate (PET) fibers. Examples thereof include polyester fibers such as, polyethylene fibers, synthetic fibers such as polyolefin fibers such as polypropylene fibers, and the like. Further, as the solvent of the antibacterial liquid, water, an organic solvent, a mixed solvent of water and an organic solvent, or the like can be appropriately selected and used.

The basis weight of the durable hydrophilic fiber in the first fiber layer 211 is, for example, 3 g / m ² or more and 15 g / m ² or less, preferably 5 g / m ² or more and 10 g / m ² or less, and the absorption rate and liquid during urination. From the viewpoint of return, it is more preferably 7 g / m ² or more and 9 g / m ² or less. If the basis weight of the durable hydrophilic fiber is less than 3 g / m ² , the absorption rate may be slowed down, and if it is larger than 15 g / m ² , the amount of body fluid returned may increase.

The basis weight of the general hydrophilic fiber in the second fiber layer 212 is not particularly limited, but is, for example, 7 g / m ² or more and 25 g / m ² or less, preferably 12 g / m ² or more and 21 g / m ² or less, and liquid return. From the viewpoint, it is more preferably 14 g / m ² or more and 18 g / m ² or less. If the basis weight of the general hydrophilic fiber is smaller than 7 g / m ² , the amount of liquid return may increase, and if it is larger than 25 g / m ² , the antibacterial property of the top sheet 21 may decrease. The basis weight of the antibacterial fiber in the second fiber layer 212 is, for example, 1 g / m ² or more and 6 g / m ² or less, preferably 2 g / m ² or more and 4 g / m ² or less. If the basis weight of the antibacterial fiber is less than 1 g / m ² , the antibacterial property may decrease, and if it is larger than 6 g / m ² , the metal ions eluted by the body fluid may affect the skin.

The basis weight of the top sheet 21 as a whole is, for example, 15 g / m ² or more and 40 g / m ² or less, preferably 19 g / m ² or more and 35 g / m ² or less, and more preferably 18 g / m ² or more and 30 g / m ² . It is as follows. If the basis weight of the top sheet 21 is less than 15 g / m ² , the liquid return may increase, and if it is larger than 40 g / m ² , the hardness tends to increase when touching the skin. The shape of the top sheet 21 is not particularly limited, as long as it covers the entire or part of the skin side surface of the absorber 22, which is required to guide the body fluid to the absorber 22 so as not to leak. good.

<Absorber>
The length (maximum length) of the absorber 22 is, for example, a range of 100 mm or more and 800 mm or less, a range of 150 mm or more and 500 mm or less, or a range of 270 mm or more and 500 mm or less. The dimension (maximum width) in the width direction of the absorber 22 is, for example, a range of 50 mm or more and 500 mm or less, a range of 60 mm or more and 400 mm or less, or a range of 70 mm or more and 105 mm or less. When the plan view shape of the absorber 22 is an hourglass shape, the longitudinal dimension is in the range of 180 mm or more and 480 mm or less, and the widthwise dimension of the ventral and dorsal portions that abut on the wearer's abdomen and back, respectively. Both are in the range of 60 mm or more and 160 mm or less, and the widthwise dimension of the crotch portion in contact with the crotch portion of the wearer is in the range of 50 mm or more and 140 mm or less. The entire surface or a part of the absorber 22 may be embossed. Examples of the plan view shape of the absorber 22 include an hourglass shape, an I-shape, a rectangle, a quadrangle with rounded corners, an oval, and the like.

In the present embodiment, the absorber 22 is interposed between the absorber covering sheet 50 and the back sheet 23, and absorbs and retains, for example, the body fluid that has permeated through the top sheet 21. The absorber 22 contains, for example, an absorbent fiber and a highly absorbent polymer (hereinafter, also referred to as “SAP”) as an absorbent base material.

(Absorbable fiber)
The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, disposable diapers, and urine absorbing pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, and hydrophilic fiber are used. Examples include rayon. Among these, fluff pulp is preferable from the viewpoint of absorbability. Examples of the fluff pulp include wood pulp (for example, coniferous bleached kraft pulp (N-BKP) such as Southern pine and Douglas fur), synthetic fiber, resin fiber, cotton-like defibrated product such as non-wood pulp, and the like. When fluff pulp is used as the absorbent fiber in the absorber 22, the basis weight of the absorbent fiber is, for example, in the range of 100 g / m ² or more and 800 g / m ² or less or 325 g / m ² or more and 615 g / m ² or less. be. As a result, more body fluid can be absorbed without impairing the touch.

(Highly absorbent polymer)
The highly absorbent polymer is not particularly limited as long as it can absorb body fluids and prevent backflow, and is composed of polyacrylic acid salt, polyaspartic acid salt, (starch-acrylic acid) graft copolymer, and (acrylic acid). Examples thereof include an acid-vinyl alcohol) copolymer, a (isobutylene-maleic anhydride) copolymer and a saponified product thereof. Among these, polyacrylic acid salt is preferable, polyacrylic acid alkali metal salt is more preferable, and sodium polyacrylate is further preferable, from the viewpoint of the amount of absorption per weight. The highly absorbent polymer can be used alone or in combination of two or more.

The highly absorbent polymer is used, for example, in the form of particles, fibers, etc., but is preferably used in the form of particles from the viewpoint of ease of handling and the like. At this time, by avoiding the use of a highly absorbent polymer of fine powder having poor fluidity as a powder and using a highly absorbent polymer having a medium particle size, the basic performance regarding absorption is enhanced and the absorber 22 is used. It is possible to reduce the rugged tactile sensation generated by the hardening of the material. The medium particle size of the highly absorbent polymer is, for example, in the range of 50 μm or more and 600 μm or less, or 100 μm or more and 500 μm or less.

The basis weight of SAP in the absorber 22 is, for example, 240 g / m ² or more and 450 g / m ² or less, or 245 g / m ² or more and 445 g / m ² or less. By setting the basis weight of SAP within the above-mentioned numerical range, gel blocking in the absorber 22 can be prevented and a large amount of body fluid can be absorbed by the absorber 22. Further, in the absorber 22, the weight of the highly absorbent polymer / the weight of the entire absorber 22 × 100 (%), which is the ratio of the weight of the highly absorbent polymer to the weight of the entire absorber 22, is, for example, 40 weight. % Or more, or 40% by weight or more and 70% by weight or less.

In the absorber 22, the morphology of the absorbent fiber and SAP may be formed by mixing SAP particles in the absorbent fiber, or may be a SAP sheet in which SAP particles are fixed between the absorbent fibers.

<Back sheet>
The back sheet 23 may be formed by using a base material having a liquid impermeable property so that the body fluid held by the absorber 22 does not wet the clothes, and the base material may be, for example, a resin film or a resin film. Examples thereof include a composite sheet which is a laminated body of a non-woven fabric and a non-woven fabric. The non-woven fabric used for the composite sheet is not particularly limited in the manufacturing method. Examples thereof include composite non-woven fabrics such as bodies and composite materials thereof. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene.

The basis weight of the back sheet 23 is, for example, in the range of 15 g / m ² or more and 60 g / m ² or less in terms of strength and workability. Further, in order to prevent stuffiness when worn, it is preferable that the back sheet 23 is provided with breathability. In order to provide the back sheet 23 with breathability, for example, a filler may be blended in the resin film of the base material, or the back sheet 23 may be embossed. Calcium carbonate can be mentioned as the filler, and a known method can be used without limitation as the blending method.

<Three-dimensional gather>
The three-dimensional gather 24 is, for example, a top sheet 21 along the longitudinal direction of the absorbent article 1 near both ends in the width direction of the absorbent article 1 in order to prevent lateral leakage of the body fluid excreted by the wearer of the absorbent article 1. It is fixed to the side of the skin. The three-dimensional gather 24 includes an elastic stretchable member 24a and a water-repellent and / or waterproof sheet member 24b.

The elastic elastic member 24a is arranged along the longitudinal direction near the free end (the other end) of the seat member 24b, imparts erectability to the free end, and wears the free end of the seat member 24b and a region in the vicinity thereof. Make it deformable according to the body shape of. In the present embodiment, one end (fixed end) in the width direction of the sheet member 24b is fixed near both ends in the width direction of the skin side surface of the back sheet 23, and the middle portion in the width direction is fixed near both ends in the width direction of the skin side surface of the top sheet 21. The other end in the width direction is an upright free end. The fixing position of the fixed end (one end in the width direction) of the sheet member 24b is not limited to this embodiment, and for example, the non-skin side surface of the back sheet 23, the top sheet 21 and the back sheet 23 in which the absorber 22 is housed inside. Examples thereof include the vicinity of both ends in the width direction of the skin side surface or the non-skin side surface of the skin side surface or the non-skin side surface of all or part of each edge of the top sheet, and the vicinity of both ends in the width direction of the skin side surface of the top sheet 21.

The sheet member 24b is a sheet having water repellency and / or waterproofness, and is made of, for example, a non-woven fabric. As the non-woven fabric for the first sheet member, a water-repellent and / or waterproof (liquid impermeable) non-woven fabric formed of hydrophobic fibers can be used without particular limitation, and for example, a spunbond non-woven fabric, a melt blow non-woven fabric, and a spunbond. Examples thereof include a composite non-woven fabric (SMS non-woven fabric) which is a non-woven fabric / melt blow non-woven fabric / spunbond non-woven fabric laminate. The basis weight of the sheet member 24b is, for example, in the range of 13 g / m ² or more and 20 g / m ² or less. As the elastic elastic member 24a, for example, a thread-shaped, string-shaped, or strip-shaped member made of natural rubber, synthetic rubber, polyurethane, or the like can be appropriately used.

<Absorbable body of the second embodiment>
As shown in FIG. 4, the absorbent main body 26 has a top sheet 21, an absorber 22 wrapped with an absorbent covering sheet 25, and a back sheet 23 laminated from the skin side to the non-skin side as basic units. If necessary, the top sheet 21 has a pair of three-dimensional gathers 24 extending in the longitudinal direction near both ends of the skin side surface in the width direction. The absorbent main body 26 has the same structure as the absorbent main body 20 except that the absorbent body 22 is wrapped with the absorbent body covering sheet 25, and the absorbent main body 20 is a predetermined modification of the absorbent main body 20. This is a modified example of. In the absorbent main body 26, the same reference numerals are given to the components common to the absorbent main body 20, and the description thereof will be omitted.

In the absorber covering sheet 25 of the present embodiment, the absorber 22 is placed or adhered to the central portion of the skin side surface in the width direction, and the vicinity of both ends in the width direction is bent so as to be above the skin side surface of the absorber 22. It is a sheet member that wraps the entire absorber 22 by overlapping, so-called C-folding. The absorber covering sheet 25 can be used, for example, to prevent SAP from falling off from the absorber 22, improve the strength of the absorber 22 by maintaining the shape of the absorber 22, increase the amount of body fluid absorbed, and make the body fluid uniform on the skin side surface of the absorber 22. It has functions such as supply. The base material of the absorbent covering sheet 25 may be any one having hydrophilicity, and a tissue containing pulp fibers, absorbent paper, or the like is particularly preferable, but a hydrophilic non-woven fabric such as an air-laid nonwoven fabric may also be used. The absorber covering sheet 25 may be arranged on the skin surface side and / or the non-skin surface side of the absorber 22 in addition to the arrangement by C-folding.

<Second seat>
Examples of modifications common to the absorbent body 20 and the absorbent body 26 include a second sheet (not shown). The second sheet is arranged, for example, between the top sheet 21 and the absorbent body 22 or the absorbent body covering sheet 25, for example, improving the liquid diffusivity of the absorbent main body 20 and the absorbent main body 26, and absorbing the body fluid. Suppresses liquid return from body 22. As the second sheet, a liquid-diffusible base material having a permeation rate of body fluid faster than that of the top sheet 22 and quickly diffusing body fluid into the absorber 22 can be used without particular limitation. Examples of the base material include hydrophilic non-woven fabrics, and among them, air-through non-woven fabrics are preferable.

The thickness of the second sheet is, for example, 0.1 mm or more, and the basis weight is, for example, 10 g / m ² or more and 60 g / m ² or less, or 15 g / m ² or more and 40 g / m ² or less. If the thickness is less than 0.1 mm, or the basis weight is less than 10 g / m ² or larger than 60 g / m ² , the body fluid tends not to sufficiently diffuse over the entire skin side surface of the absorber 22. The shape of the second sheet is not particularly limited, but is preferably a shape that can completely cover the surface of the absorber 22 so that the body fluid diffuses uniformly into the absorber 22.

The ratio of the basis weight of the top sheet 21 to the second sheet (percentage, basis weight of the second sheet / basis weight of the top sheet 21) is, for example, in the range of 50% or more and 130% or less, or 50% or more and 100% or less. be. By setting the basis weight ratio to 50% or more and 130% or less, the liquid diffusivity and liquid permeability when the body fluid permeates from the top sheet 21 to the second sheet are improved, and the liquid returns from the second sheet to the top sheet 21. It is further suppressed.

<Manufacturing method of absorbent body>
The absorbent body 20 can be manufactured by a known manufacturing method. For example, the top sheet 21, the absorber 22, and the back sheet 23 are overlapped in the thickness direction, and the absorbent body 22 is placed between the top sheet 21 and the back sheet 23. And the process of fixing the edge of the top sheet 21 and the edge of the back sheet 23 using hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc. over a part or the whole circumference. A manufacturing method including a step of installing a three-dimensional gather 24 at a predetermined position of the back sheet 23 and the top sheet 21 can be mentioned. The absorbent body 26 can be manufactured in the same manner as the absorbent body 20 except that the absorbent body 22 is wrapped with the absorbent body covering sheet 25. The absorbent main bodies 20 and 26 are appropriately provided with leg gathers, waist gathers, side flaps and the like, if necessary.

<Manufacturing method of pants-type absorbent articles>
The method for producing the pants-type absorbent article 1 is not particularly limited, and a conventionally known method can be adopted. For example, at the peripheral edges of the leg openings 12 of the front side portion 13, the rear side portion 15, and the crotch portion 14, the above-mentioned elastic expansion and contraction are performed between the exterior nonwoven fabric sheets 301, 401, 501 and the interior nonwoven fabric sheets 302, 402, 502. The step of arranging and joining the members, the step of arranging the absorbent main body 20 (or the absorbent main body 26) on the body side of the exterior body, both sides of the front side portion 13 in the width direction and both sides of the rear side portion 14 in the width direction. The pants-type absorbent article 1 can be obtained by going through each step in the order of joining the edges.

Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above-described embodiments and examples. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. It is also clear from the description of the claims that the form with such changes or improvements may be included in the technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples. The present invention is not limited to the examples shown below.

(Preparation of general hydrophilic fiber and water resistant hydrophilic fiber)
An aqueous solution (hydrophilicizing treatment liquid A) having a concentration of 2.0% by weight of lauryl phosphate potassium salt was prepared. After immersing the polyethylene fiber in this hydrophilization treatment liquid A at room temperature for 60 minutes, it is dried with hot air at 120 ° C. to prepare a general hydrophilic fiber having 4 drops in the above-mentioned hydrophilicity test (see below). bottom. Further, an aqueous solution (hydrophilicizing treatment liquid B) having a concentration of 1.0% by weight of polyoxyethylene stearyl ether was prepared. After immersing the polyethylene fiber in this hydrophilization treatment liquid B at room temperature for 60 minutes, it was dried with hot air at 120 ° C. to prepare a durable hydrophilic fiber having 9 drops in the above-mentioned hydrophilicity test.

(Preparation of antibacterial fiber)
With polyethylene fibers immersed in a 4.0 wt% sodium metasilicate aqueous solution, a certain amount of sodium aluminate 3.0 wt% aqueous solution and silver ion-supporting zeolite were added, and the mixture was immersed at 90 ° C. for 3 hours to support silver ion-supported zeolite. A polyethylene fiber was produced. The silver ion loading ratio of the obtained polyethylene fiber was 0.002% by weight.

(Making a top sheet)
The general hydrophilic fibers (fineness 2.6 dtex, fiber length 50 mm), durable hydrophilic fibers (fineness 2.0 dtex, fiber length 51 mm), and antibacterial fibers (fineness 2.2 dtex, fiber length 51 mm) obtained above are used. A two-layer type air-through non-woven fabric was prepared so that durable hydrophilic fibers were arranged in the first fiber layer and general hydrophilic fibers and antibacterial fibers were arranged in the second fiber layer, and used as a top sheet. The composition is shown in Table 1.

(Creation of pants-type absorbent articles)
The absorber was formed by mixing 9.0 g of fluff pulp, which is the base material, with 9.0 g of SAP, and the two-layer type air-through non-woven fabric obtained above as the top sheet (basis weight 20 g / m ² ). ), Breathable polyethylene sheet as a liquid-impermeable back sheet (basis weight 32 g / m ² ), spunbond non-woven fabric / melt blown non-woven fabric / spunbond non-woven fabric laminate as a three-dimensional gather (basis weight 15 g / m ² ) , Tissue (basis weight 15 g / m ² ) as a carrier sheet covering the skin side and non-skin side of the absorber, spunbond non-woven fabric (basis weight 17 g / m ² ) as an exterior non-woven fabric sheet and an interior non-woven fabric sheet, and a string as an elastic stretchable member. The dimensions of the absorbent body are 350 mm in the longitudinal direction and 180 mm in width, and the dimensions of the pants-type absorbent article are 400 mm in the longitudinal direction and 200 mm in width. And the pants-type absorbent articles of Comparative Examples 1 to 3 were produced.

The following evaluation tests were carried out on the pants-type absorbent articles of Examples 1 to 4 and Comparative Examples 1 to 3. The results are shown in Table 1.
(Absorption rate)
A measuring jig having an inner diameter of 19 mm and a weight of 755.6 g is placed in the center of a cylinder having a bottom area of 16.8 cm ² in the longitudinal direction and the width direction of the absorbent body. 20 ml of each saline solution is dropped from the hole at the top, and the time (seconds) is measured from the time when the saline solution comes into contact with the absorbent body, with the end point where the liquid is completely sucked into the circumference of the center circle of the jig. bottom.
(Liquid return property)
Absorbable With the top sheet of the main body facing up, 120 ml of saline solution was poured toward the center of the absorber, left for 10 minutes, and then weighed in advance at the absorption site of the saline solution. (ADVANTEC No. 2 filter paper, diameter 55 mm) is placed, a weight of 35 kgf / cm ² is placed on it, and after 30 seconds, the weight of the filter paper is measured, and the weight difference of the filter paper is defined as the liquid return amount (g). , The liquid returnability was evaluated. The smaller the amount of liquid return, the better the liquid return property.
(Antibacterial)
For antibacterial properties, an antibacterial test was conducted according to the JIS L 1902 method using a top sheet, and those with an antibacterial activity value of 3 or more using the results of a standard cloth (cotton cloth) of Staphylococcus aureus were ○ 2 or more. Those less than 3 were marked with Δ, and those less than 2 were marked with x.

From the results in Table 1, it can be seen that the absorbent main bodies of Examples 1 to 4 are excellent in absorption rate, liquid return, and antibacterial property. On the other hand, in Comparative Example 1 containing 3 g / m ² of antibacterial fiber, antibacterial property could be confirmed, but water absorption rate and liquid return property were poor. Further, in Comparative Example 2 in which only the antibacterial fiber was used as the second fiber layer, the antibacterial property was poor and the absorption rate was slow. Furthermore, Comparative Example 3 did not show antibacterial properties.
Therefore, according to the present invention, the pants type using an absorbent main body having excellent liquid permeability, excellent liquid returnability, and excellent antibacterial properties even when the body fluid remains on the top sheet. Absorbent articles can be provided.

1 Pat type absorbent article 11 Waist opening 12 Leg opening 13 Ventral part 14 Crotch part 15 Dorsal part 20, 26 Absorber body 21 Top sheet 211 First fiber layer 212 Second fiber layer 22 Absorber 23 Back sheet 24 Solid gather 24a Elastic elastic member 24b Sheet member 25 Absorber covering sheet 30 Ventral band member 301 Exterior non-woven fabric sheet (ventral band member)
302 Interior non-woven fabric sheet (ventral band member)
40 Back side band member 401 Exterior non-woven fabric sheet (back side band member)
402 Interior non-woven fabric sheet (backside band member)
50 Crotch band member 501 Exterior non-woven fabric sheet (Crotch band member)
502 Interior non-woven fabric sheet (crotch band member)

Claims (5)

The wearer is interposed between the ventral band member arranged on the ventral side of the wearer, the dorsal band member arranged on the dorsal part of the wearer, and the ventral band member and the dorsal band member. Waist opening formed by joining the crotch band member arranged in the crotch part of the body and supporting the absorbent body, and the widthwise both ends of the ventral band member and the widthwise both ends of the dorsal band member. And a pants-type absorbent article comprising a leg opening.
The absorbent body includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the top sheet and the back sheet, and both ends in the longitudinal direction are the antinodes, respectively. It is joined to the skin side surface of the side band member and the skin side surface of the dorsal band member.
The ventral band member, the dorsal band member, and the crotch band member are between an interior nonwoven fabric sheet located on the skin side surface side and an exterior nonwoven fabric sheet located on the non-skin side surface, and between the interior nonwoven fabric sheet and the exterior nonwoven fabric sheet. With multiple elastic elastic members arranged in,
The top sheet comprises a first fiber layer containing durable hydrophilic fibers and a second fiber layer adjacent to the non-skin contact surface of the first fiber layer and containing general hydrophilic fibers and antibacterial fibers. The skin contact surface of the first fiber layer constitutes the skin contact surface of the top sheet, and the non-skin contact surface of the second fiber layer constitutes the non-skin contact surface of the top sheet.
The basis weight of the durable hydrophilic fiber in the first fiber layer is 3 g / m ² or more and 15 g / m ² or less, and the basis weight of the general hydrophilic fiber in the second fiber layer is 7 g / m ² or more and 25 g / m /. A pants-type absorbent article characterized in that the basis weight of the antibacterial fiber is ^{1 g / m 2 or more and 6 g / m 2 or less} .
However, the general hydrophilic fiber and the durable hydrophilic fiber are when 100 μL of 0.9% saline solution is dropped every 30 seconds at the same position of the air-through nonwoven fabric having a basis weight of 20 g / m ² containing the fiber. , The dropped saline solution is defined by the hydrophilicity evaluation by observing the number of times of dropping when the dropped saline does not permeate into the air-through non-woven fabric and becomes droplets on the air-through non-woven fabric, and the hydrophilicity evaluation is performed once or more and eight times. The fiber contained in the air-through nonwoven fabric described below is referred to as a general hydrophilic fiber, and the fiber contained in the air-through nonwoven fabric having a hydrophilicity evaluation of 9 times or more is referred to as a durable hydrophilic fiber. The pants-type absorbent article according to claim 1, wherein the top sheet is an air-through nonwoven fabric. The pants-type absorbent article according to claim 1 or 2, wherein the top sheet has a basis weight of 18 g / m ² or more and 30 g / m ² or less. Claims 1 to 3 are characterized in that the absorbent body further comprises an absorbent coated sheet disposed between the top sheet and the absorbent, and the absorbent coated sheet contains pulp fibers. The pants-type absorbent article according to any one of the above. The durable hydrophilic fiber contained in the first fiber layer is treated with a castor oil derivative, and the general hydrophilic fiber contained in the second fiber layer is treated with an anionic surfactant. The pants-type absorbent article according to any one of claims 1 to 4.

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