JP7292075B2 - absorbent article - Google Patents

Description

TECHNICAL FIELD The present invention mainly relates to absorbent articles such as urine absorption pads, incontinence pads, disposable diapers, sanitary napkins, and panty sheets, and more particularly to absorbent articles provided with an antibacterial agent.

Conventionally, there has been known a technique of suppressing the growth of bacteria contained in body fluids such as urine and menstrual blood, thereby reducing skin troubles and suppressing the generation of bad odors, by providing the absorbent article with an antibacterial agent. . Since the antibacterial agent exerts its antibacterial effect against bacteria and the like contained in the body fluid only when it comes into contact with the body fluid, it is desirable to distribute the antibacterial agent evenly over the entire area where the body fluid is absorbed.

As a means of placing an antibacterial agent in an absorbent article, there is a technique of dispersing and mixing the antibacterial agent in the absorbent body by mixing the pulp fiber with the powdery antibacterial agent when the absorbent body is stacked. In this method, the antibacterial effect was insufficient because the antibacterial effect was not exhibited against body fluids that did not come into contact with the antibacterial agent. As another means, there is a technique of spraying or applying an antibacterial agent dissolved in a liquid to the surface of the absorbent body, but there is a risk that the absorption performance of body fluids may be deteriorated by applying the liquid to the absorbent body. rice field.

On the other hand, in Patent Document 1 below, an absorbent body has a first absorbent layer and a first sheet located on the non-skin-facing side of the first absorbent layer, and the first sheet is provided on the skin. An absorbent article is disclosed which has a plurality of recesses recessed from the facing surface side toward the non-skin facing surface side, and an antibacterial agent is disposed in each of the plurality of recesses.

In addition, in Patent Document 2 below, an antibacterial sheet is arranged on the outermost surface of the topsheet, which is the skin side, or the surface of the topsheet on the absorber side, and the antibacterial sheet is composed of a hydrophilic fiber layer and a hydrophobic a sheet-like substrate containing a hydrophilic fiber layer; and an antibacterial composition layer formed on the hydrophilic fiber layer of the sheet-like substrate and made of an antibacterial composition, and the antibacterial sheet The antibacterial composition layer side is attached to the surface sheet via an adhesive, and the antibacterial composition comprises a thermoplastic water-soluble polymer that is solid at room temperature and dissolves in body fluids, and an antibacterial agent. An absorbent article is disclosed comprising:

JP 2018-99203 A Japanese Patent No. 5096736

In Patent Literature 1, the absorber is provided with a first sheet having recesses, so that the body fluid absorbed by the absorber quickly diffuses in the absorber along the recesses of the first sheet, Although the action and effect of exerting an antibacterial effect by coming into contact with the antibacterial agent arranged in the concave portion of the first sheet are described, the antibacterial agent does not reach the concave portion of the first sheet and is arranged on the skin side of the first sheet. Body fluids absorbed by the first absorbent layer, the surface sheet, the wrapping sheet that wraps the absorbent body, etc. do not come into contact with the antibacterial agent, and the antibacterial effect of the antibacterial agent does not appear, so such a first absorbent layer , the surface sheet, the wrapping sheet, and the like, may emit offensive odors from the body fluids absorbed.

On the other hand, in Patent Document 2, the antibacterial sheet uses a thermoplastic water-soluble polymer that dissolves in body fluids as a carrier for the antibacterial agent in the antibacterial composition attached to the sheet-like substrate. It is described that the thermoplastic water-soluble polymer is dissolved by contact, and as a result, the antibacterial agent in the thermoplastic water-soluble polymer is released and exerts an antibacterial effect. is released and flows out with body fluids, so that almost no antibacterial agent remains on the antibacterial sheet after the body fluids are discharged. For this reason, there is a possibility that body fluids adhering to the skin surface or body fluids absorbed by the topsheet may generate a bad odor. In addition, since the antibacterial composition layer composed of a thermoplastic water-soluble polymer and an antibacterial agent is applied onto the hydrophilic fiber layer of the antibacterial sheet by spray coating or the like, the hydrophilic agent is applied to the surface of the fiber in advance. Although the hydrophilicity is imparted by attaching the hydrophilizing agent, the antibacterial composition layer is further coated on top of the hydrophilizing agent, so the hydrophilic effect of the hydrophilizing agent cannot be sufficiently exhibited, and the absorption There was a risk of performance degradation.

Therefore, the main object of the present invention is to provide an absorbent article in which the antibacterial effect of the antibacterial agent can be sufficiently exhibited and the absorbent performance is not lowered.

In order to solve the above problems, as the present invention according to claim 1, an absorbent article including an absorbent body,
An antibacterial nonwoven fabric made of fibers with a fiber treatment agent attached to the surface and an antibacterial agent is disposed on the skin side of the absorbent body,
The antibacterial agent comprises a fiber antibacterial agent kneaded into the fiber and an antibacterial agent in the fiber treatment agent mixed with the fiber treatment agent ,
The absorbent article is provided , wherein the antibacterial agent contained in the fibers is a sparingly water-soluble antibacterial agent, and the antibacterial agent contained in the fiber treatment agent is a water-soluble antibacterial agent.

In the invention according to claim 1, the antibacterial nonwoven fabric is disposed on the skin side of the absorbent body, and the antibacterial agent contained in the antibacterial nonwoven fabric is the antibacterial agent in the fiber kneaded into the fiber, and the antibacterial agent in the fiber. It is composed of an antibacterial agent in the fiber treatment agent mixed with the treatment agent. Therefore, when body fluids are discharged and pass through the antibacterial nonwoven fabric, the fiber treatment agent adhering to the surface of the fibers constituting the antibacterial nonwoven fabric and the antibacterial agent in the fiber treatment agent contained therein The agent is released from the fiber and dissolves in body fluids. The body fluid in which the antibacterial agent is dissolved in the fiber treatment agent is absorbed and retained in the absorbent. Since the antibacterial agent in the fiber treatment agent is dissolved in the body fluid absorbed by this absorbent body, the antibacterial effect of this antibacterial agent is exerted and no foul odor is generated. On the other hand, since the antibacterial agent in the fiber is carried by being kneaded inside the fiber, it remains in the state carried in the fiber and exhibits an antibacterial effect at a position close to the wearer's skin surface. . In addition, since the antibacterial agent in the fiber treatment agent is mixed with the fiber treatment agent attached to the surface of the fiber, it does not impede the effect of the fiber treatment agent such as hydrophilicity and flexibility, and the absorption performance is improved. does not get worse.

In addition, in the invention according to claim 1 , the antibacterial agent in the fiber must remain in the fiber without eluting into body fluids, so it is preferable to use an antibacterial agent that is poorly soluble in water. Since the antibacterial agent in the fiber treatment agent needs to be dissolved in the body fluid and mixed and diffused in the body fluid, it is preferable to use a water-soluble antibacterial agent.

As the present invention according to claim 2 , the absorbent according to claim 1 , wherein the water-insoluble antibacterial agent is an inorganic antibacterial agent, and the water-soluble antibacterial agent is an organic antibacterial agent. Goods are provided.

In the second aspect of the invention, specific examples are given as the water-insoluble and water-soluble antibacterial agent.

As a third aspect of the present invention, there is provided an absorbent article according to any one of the first and second aspects, wherein the fiber treatment agent is a hydrophilizing agent.

In the invention according to claim 3 , since a hydrophilizing agent is used as the fiber treatment agent, the hydrophilicity of the fiber can be increased, and the antibacterial agent can be quickly dissolved in body fluids.

As the present invention according to claim 4 , a surface sheet is disposed on the skin side of the absorbent body and contacts the wearer's skin surface,
4. The absorbent article according to any one of claims 1 to 3, wherein at least part of said topsheet is composed of said antibacterial nonwoven fabric.

In the fourth aspect of the present invention, since the surface sheet closest to the skin is made of an antibacterial nonwoven fabric, the antibacterial effect of the antibacterial agent in the fiber treatment agent, which flows out together with the body fluid when the body fluid is discharged, is absorbed by the surface sheet. The sheet material placed on the body side is also spread, and the antibacterial effect is more likely to be exhibited, and since the side of the skin of the top sheet is always in contact with the skin surface, after the body fluid is discharged, the odor caused by the body fluid attached to the skin surface is eliminated. occurrence can be reliably suppressed.

As the present invention according to claim 5 , a topsheet is provided on the skin side of the absorbent body to contact the wearer's skin surface, and a second sheet is provided between the topsheet and the absorbent body,
There is provided an absorbent article according to any one of claims 1 to 4 , wherein at least part of said second sheet is composed of said antibacterial nonwoven fabric.

In the fifth aspect of the present invention, the second sheet provided between the surface sheet and the absorbent body is made of an antibacterial nonwoven fabric.

As the present invention according to claim 6 , the absorbent body is surrounded by an enveloping sheet,
6. The absorbent article according to any one of claims 1 to 5 , wherein at least a portion of the enveloping sheet disposed on the skin side of the absorbent body is composed of the antibacterial nonwoven fabric.

In the sixth aspect of the present invention, the wrapping sheet surrounding the absorbent body is made of an antibacterial nonwoven fabric.

As the present invention according to claim 7 , the content of the antibacterial agent in the fiber contained per unit volume of the antibacterial nonwoven fabric is greater than the content of the antibacterial agent in the fiber treatment agent. Any one of claims 1 to 6 . An absorbent article as described above is provided.

In the invention according to claim 7 , the content of the antibacterial agent in the fiber contained per unit volume of the antibacterial nonwoven fabric is made larger than the content of the antibacterial agent in the fiber treatment agent, so that body fluids Since the amount of the antibacterial agent remaining in the antibacterial nonwoven fabric after excretion of bodily fluids is greater than the amount of the antibacterial agent eluted from the antibacterial nonwoven cloth accompanying discharge, it is possible to wear it before and after urination. A large amount of the antibacterial agent is placed near the skin surface of the person, and the antibacterial effect near the skin surface can be maintained.

As the present invention according to claim 8 , any one of claims 1 to 7 , wherein the antibacterial nonwoven fabric is provided in a portion corresponding to the body fluid discharge part of the wearer, and the antibacterial nonwoven fabric is not provided in other regions. There is provided an absorbent article as described in .

In the eighth aspect of the present invention, the antibacterial nonwoven fabric is provided only on the part corresponding to the wearer's bodily fluid discharge part, and is not provided on other parts. By providing the antibacterial non-woven fabric only in the necessary parts, the antibacterial effect can be fully exhibited and the cost can be suppressed.

As described in detail above, according to the present invention, it is possible to provide an absorbent article in which the antibacterial effect of the antibacterial agent can be sufficiently exhibited and the absorption performance is not lowered.

1 is a partially broken development view of the urine absorbing pad 1 according to the present invention; FIG. FIG. 2 is a view taken along line II-II of FIG. 1; FIG. 2 is a view taken along line III-III in FIG. 1; 1 is a cross-sectional view of a fiber 10; FIG. FIG. 2A is a sectional view of the urine absorbing pad 1 before urination and (B) after urination. (A) is a cross-sectional view of the fiber before urination and (B) is after urination. 1 is a cross-sectional view of a fabric with an antimicrobial agent, showing conventional morphology; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Example of basic structure of urine absorbing pad]
As shown in FIGS. 1 to 3, the urine absorbing pad 1 according to the present invention comprises a leak-proof sheet 2 made of a polyethylene sheet or the like and a contact surface with the wearer's skin, so that urine and the like can quickly permeate. an absorbent body 4 interposed between the two sheets 2 and 3; an exterior sheet 5 covering the outermost surface (non-skin-contacting surface) of the urine absorbing pad 1; Side non-woven fabrics 6, 6 forming a pair of left and right three-dimensional gathers BS, BS projecting to the skin side in a predetermined section in the front-rear direction including at least the urinary opening of the wearer, with the side edge portion as the standing base end; It is mainly composed of a second sheet 8 disposed between the surface sheet 3 and the absorbent body 4 as necessary, and around the absorbent body 4, the leakage prevention sheet 2 is provided at the upper and lower edges. The outer edges of the surface sheet 3 and the outer sheet 5 are joined by a joining means such as an adhesive such as hot melt, heat sealing, or ultrasonic sealing. The leak-proof sheet 2, the top sheet 3, the exterior sheet 5 and the side non-woven fabric 6 are joined by a joining means such as an adhesive such as hot melt, heat sealing, or ultrasonic sealing.

The structure of the urine absorbing pad 1 will be further detailed below.
The leak-proof sheet 2 is made of a sheet material having at least water impermeability, such as polyethylene, but in recent years, there is a tendency to use a material having moisture permeability from the viewpoint of preventing stuffiness. The water-impervious/moisture-permeable sheet material is produced by melting and kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet uniaxially or biaxially. A sheet is preferably used. As the leak-proof sheet 2, a poly-laminated nonwoven fabric obtained by laminating a plastic film and a nonwoven fabric may be used.

Next, for the surface sheet 3, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is preferably used. The material fibers that make up the nonwoven fabric include synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, as well as recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a method, a spunbond method, a thermal bond method, a meltblown method, a needle punch method, or the like can be used. Among these processing methods, the spunlace method is superior in flexibility and drapeability, and the thermal bond method is superior in that it is bulky and has high compression recovery. When a large number of through holes are formed in the surface sheet 3, body fluids are rapidly absorbed, and the dry touch property is excellent. The fibers of the non-woven fabric may be either long fibers or short fibers, but preferably short fibers are used in order to produce the feel of a terry cloth. Also, in order to facilitate embossing, it is preferable to use olefin fibers such as polyethylene or polypropylene having a relatively low melting point. In addition, composite fibers of core-sheath type fibers, side-by-side type fibers, and split type fibers having a high-melting-point fiber as a core and a low-melting-point fiber as a sheath can also be preferably used.

The absorbent body 4 interposed between the leak-proof sheet 2 and the topsheet 3 is made of, for example, flocculent pulp and superabsorbent polymer. The superabsorbent polymer is mixed in the pulp constituting the absorbent body 4, for example, as granular powder. Examples of the pulp include chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp with a longer fiber length is more functional and functional than hardwood pulp. It is preferably used in terms of price.

Synthetic fibers may also be mixed in the absorber 4 . For the synthetic fibers, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. A mixture may also be used. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, and split type fibers having a high-melting-point fiber as a core and a low-melting-point fiber as a sheath can also be used. In the case of hydrophobic fibers, the synthetic fibers are preferably surface-treated with a hydrophilizing agent so as to have affinity for body fluids.

The superabsorbent polymer includes "powder" in addition to "particles". As the superabsorbent polymer, the particle size used in this type of absorbent article can be used as it is, and the average particle size is 1000 μm or less, preferably the particle size when not absorbed is 106 μm or more, and the total weight is 99%. % or more, particularly preferably 99% by weight or more of the total particles having a diameter of 150 to 850 μm. The average particle size of the unabsorbed particles is preferably about 250 to 500 μm. In addition, it is desirable that the superabsorbent polymer has an average particle diameter after absorption of at least three times the average particle diameter at the time of non-absorption, specifically 500 μm or more. The average particle size of the superabsorbent polymer when not absorbed means the particle size at the integrated value of 50% in the weight-based particle size distribution. The weight-based particle size distribution in this case is measured according to JISZ8815-1994. That is, sieves with openings of 710 μm, 500 μm, 300 μm, 150 μm and 106 μm with an inner diameter of 150 mm and a depth of 45 mm are stacked with the narrower sieve facing down, and the 710 μm sieve with the widest opening on the top is stacked. 50 g of the measurement sample is put in and sieved for 10 minutes with a sieve vibrator, the weight of the measurement sample remaining on each sieve is measured, and the weight of the measurement sample remaining on each sieve is based on the weight of the first measurement sample. It is measured by determining the weight percent.
The basis weight of the superabsorbent polymer can be appropriately determined according to the absorption amount required for the use of the absorbent body 4 . Therefore, although it cannot be generalized, it can be 50 to 350 g/m ² . If the weight per unit area of the polymer is less than 50 g/m ² , it becomes difficult to secure the absorption amount. If it exceeds 350 g/m ² , not only does the effect saturate, but also the excessive amount of the superabsorbent polymer gives a jerky feeling of discomfort.

In the absorbent body 4, the ratio of the super absorbent polymer to the total weight of the pulp and the super absorbent polymer is preferably 5-90% by weight, particularly 30-70% by weight. If the ratio of the superabsorbent polymer is less than 5% by weight, the water absorption capacity may be insufficient. On the other hand, when it is more than 90% by weight, the feeling of grittyness (feeling of particles) of the superabsorbent polymer is felt strongly, and the feeling of use deteriorates.

Preferably, at least the skin side and the non-skin side of the absorbent body 4 are covered with an enveloping sheet 9 made of crepe paper or non-woven fabric in order to retain the shape and improve diffusion. When the wrapping sheet 9 is provided to cover the absorbent body 4, the wrapping sheet 9 is interposed between the surface sheet 3 and the absorbent body 4, and the wrapping sheet 9 is made of crepe paper. In this case, the wrapping sheet 9, which has excellent absorbency, quickly diffuses the bodily fluids and prevents the bodily fluids absorbed by the absorber 4 from returning back. In order to wrap the absorbent body 4 with the wrapping sheet 9, as shown in FIGS. Alternatively, the skin side and the non-skin side of the absorbent body 4 may be covered with separate sheets.

It is preferable to form cut lines 4a, 4a around the legs, which are curvilinear and bulge inward in the width direction, on both sides of the absorbent body 4. As shown in FIG. By providing the cut lines 4a, 4a around the legs, the fit around the legs when worn is improved, leakage of body fluids can be prevented, and stiff feeling is reduced to improve the feeling of wearing. Although the position of the cut lines 4a, 4a around the legs in the longitudinal direction is arbitrary, it is preferable to provide them in the central portion in the longitudinal direction, as shown in FIG. Also, the shape of the curve is arbitrary, and in the illustrated example, it is formed in an arc shape.

The outer sheet 5 covers the outer surface (non-skin-contacting surface) of the leak-proof sheet 2 to make the outer surface of the urine absorbing pad 1 look and feel like cloth. The exterior sheet 5 is preferably made of nonwoven fabric. In addition to synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, polyamides, etc., recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used as the material fibers, and the processing method is the spunlace method. , a spun bond method, a thermal bond method, an air through method, a needle punch method, or the like. However, spunbond nonwoven fabric, SMS nonwoven fabric, SMMS nonwoven fabric, or other long-fiber nonwoven fabric is preferable in that both feel and strength can be achieved.

The nonwoven fabric forming the exterior sheet 5 can be used singly or in a plurality of layers. When using a plurality of layers, the nonwoven fabrics are fixed to each other with an adhesive such as hot melt. preferably. When non-woven fabric is used, the fiber basis weight is preferably 10 to 50 g/m ² , particularly 15 to 30 g/m ² .

By forming one or a plurality of temporary fixing layers (not shown) on the non-use side (outer surface) of the outer sheet 5, the urine absorbing pad 1 is fixed to underwear, paper diapers, etc. when worn on the body. You may do so. As the temporary fixing layer, a mechanical bonding type hook material may be used, or an adhesive may be used. The temporary fixing layer is provided as necessary, and does not have to be provided.

In the illustrated example, the outer sheet 5 is slightly wider than the absorber 4, and both side portions extend to the skin side of the top sheet 3 so as to involve the side edges of the leak-proof sheet 2 and the top sheet 3. The side non-woven fabric 6 extending from the surface of both sides of the top sheet 3, specifically urine, permeates the outer surface side of the exterior sheet 5 extending to the skin side on the outer side of the top sheet 3 in the width direction. A side nonwoven fabric 6 made of a nonwoven fabric material subjected to appropriate water-repellent treatment or hydrophilic treatment is provided according to the purpose of preventing water from slipping or improving the feel of the skin. As the side non-woven fabric 6, it is possible to use natural fibers, synthetic fibers, regenerated fibers, or the like, and those formed by an appropriate processing method can be used. For this reason, it is preferable to use a nonwoven fabric with a reduced basis weight and air permeability. Specifically, it is desirable to use a non-woven fabric with a basis weight of 8 to 23 g/m ² , and in order to reliably prevent permeation of body fluids, silicone-based, paraffin-based, alkylchromic chloride-based water repellents, etc. A water-repellent nonwoven fabric coated with is preferably used.

The inner portion of the side non-woven fabric 6 is folded almost double, and inside the double sheet, one or a plurality of thread-like elastic stretchable members 7, three in the illustrated example, are provided in the middle portion in the height direction. 7 are arranged in a state where both ends or appropriate positions in the longitudinal direction are fixed. As shown in FIG. 3, the double sheet portion is folded outward once at the front and rear ends and adhered to the absorbent body 4 side in a laminated state, thereby providing a front and back portion including at least the wearer's urination opening. As shown in FIG. 2, a left and right pair of three-dimensional gathers BS, BS standing on the skin side are formed within a predetermined section in the direction.

The said second sheet 8 should just have hydrophilicity with respect to a bodily fluid. Specifically, recycled fibers such as rayon and cupra, natural fibers such as cotton, etc. are used to make the material itself hydrophilic, or synthetic materials such as olefins such as polyethylene or polypropylene, polyesters, and polyamides are used. A fiber that has been surface-treated with a hydrophilizing agent to impart hydrophilicity can be used. In addition, composite fibers such as core-sheath type fibers, side-by-side type fibers, split type fibers, etc., in which a fiber having a high melting point is used as a core and a fiber having a low melting point is used as a sheath, can be used. Fibers constituting the nonwoven fabric may be long fibers, short fibers, or a mixture thereof. The second sheet 8 can be made of any known type of non-woven fabric such as air-through, air-laid, spunbond, etc., but it is preferable to use an air-through that does not reduce the breathability and gives the top sheet 3 a soft and cushiony feel.

[Antibacterial nonwoven fabric]
In the urine absorbing pad 1 according to the present invention, as shown in FIG. 4, on the skin side of the absorbent body 4, an antibacterial nonwoven fabric made of fibers 10 with a fiber treatment agent 11 attached to the surface and an antibacterial agent is arranged. It is characteristic that The antibacterial nonwoven fabric constitutes at least part of a member arranged on the skin side of the absorbent body 4, specifically one or more members selected from the group of the surface sheet 3, the second sheet 8 and the envelope sheet 9. are doing. That is, at least a portion of any one of the surface sheet 3, the second sheet 8 and the enveloping sheet 9, or two or more members selected from these, is composed of the antibacterial nonwoven fabric. When the wrapping sheet 9 is composed of the antibacterial nonwoven fabric, if at least a part of the wrapping sheet 9 covering at least the skin side of the absorbent body 4 is the antibacterial nonwoven fabric, the non-skin side of the absorbent body 4 is covered. The enveloping sheet 9 does not have to be the antibacterial nonwoven fabric, and crepe paper or a nonbacterial nonwoven fabric may be used.

The antibacterial nonwoven fabric may constitute the entire surface of the surface sheet 3, the second sheet 8, or the envelope sheet 9, or may constitute only the part corresponding to the wearer's bodily fluid discharge part, and the other part. may not be provided with the antibacterial nonwoven fabric. In the latter case, the part other than the antibacterial nonwoven fabric is preferably formed of a nonbacterial nonwoven fabric in the form in which the antibacterial nonwoven fabric constitutes the surface sheet 3 or the enveloping sheet 9. In the form in which the nonwoven fabric constitutes the second sheet 8, the second sheet 8 may be formed of a nonwoven fabric having no antibacterial properties, or may not be provided with anything in particular.

As shown in FIG. 4, the antibacterial agent contained in the antibacterial non-woven fabric consists of an antibacterial agent 12 in the fiber kneaded into the fiber 10 and an antibacterial agent 13 in the fiber treatment agent mixed in the fiber treatment agent 11 . It consists of

The in-fiber antibacterial agent 12 is contained in the fiber 10 by kneading the fiber 10 during spinning according to a known manufacturing method. Specifically, the fiber antibacterial agent 12 is kneaded in advance with the raw material resin for producing the nonwoven fabric, and the raw material resin is used for spinning, and then the nonwoven fabric is produced. The material of the fibers 10 may be any of synthetic fibers, semi-synthetic fibers, and natural fibers, but acetate fibers and rayon fibers, which can be kneaded during spinning and are highly hydrophilic, are preferable. The amount of the in-fiber antibacterial agent 12 kneaded into the fibers 10 is preferably 0.1 to 20% by weight with respect to the weight of the fibers 10 from the viewpoint of antibacterial durability and cost.

The fiber treatment agent 11 is adhered to the surface of the fiber 10 by coating the surface of the constituent fibers of the nonwoven fabric produced by various methods according to a conventional method. As the coating method, known methods can be employed without limitation, and examples thereof include curtain spray method, slot coating method, spiral spray method, beat method, gravure coating method, and die coater method.

As the fiber treatment agent 11, known treatment agents used for the purpose of improving the properties of fibers, such as hydrophilizing agents that increase hydrophilicity to body fluids and softening agents that improve touch feeling with the skin, are used without limitation. However, especially in the urine absorbing pad 1 according to the present invention, it is preferable to use a hydrophilizing agent in order to facilitate dissolving the fiber treatment agent 11 in body fluids.

As the hydrophilizing agent, in consideration of safety to the human body, safety in the manufacturing process, etc., higher alcohols, higher fatty acids, nonionic surfactants added with ethylene oxide such as alkylphenol, and alkyl phosphate ester salts are used. Anionic active agents such as (octyl and dodecyl), alkyl sulfates, etc. are preferably used alone or in mixtures. About 1 to 2.0% by weight, preferably about 0.2 to 1.0% by weight.

In order to mix the antibacterial agent 13 in the fiber treatment agent with the fiber treatment agent 11, the solid or semi-solid fiber treatment agent 11 is heated at room temperature to increase its fluidity, and then the antibacterial agent 13 in the fiber treatment agent is added. to mix. After that, the mixed liquid is coated on the sheet material by a predetermined method.

Examples of the antibacterial agent include inorganic antibacterial agents such as gold, silver, copper, platinum, iron and zinc, and organic antibacterial agents such as benzalkonium chloride, benzethonium chloride and cetylpyridinium chloride. The inorganic antibacterial agent has the property of being less water-soluble than the organic antibacterial agent.

In particular, as the in-fiber antibacterial agent 12 to be kneaded into the fibers 10, it is preferable to use an antibacterial agent that is sparingly soluble in water so that it is difficult to be eluted by urination and easily stays in the fibers 10. Further, as the antibacterial agent 13 in the fiber treatment agent mixed with the fiber treatment agent 11, it is preferable to use a water-soluble antibacterial agent so that it is easily eluted by urination and is easily mixed and diffused in the urine. preferable. The water-poorly soluble antibacterial agent mentioned above is an antibacterial agent having low water solubility, and specifically, it is preferable to use the inorganic antibacterial agent. The water-soluble antibacterial agent mentioned above is a highly water-soluble antibacterial agent, and specifically, it is preferable to use the organic antibacterial agent.

5 and 6 are schematic cross-sectional views of the urine absorbing pad 1 and fibers, respectively, showing the state before and after urination. In the embodiment shown in FIG. 5, the surface sheet 3 is made of antibacterial nonwoven fabric. When urine passes through the antibacterial nonwoven fabric (surface sheet 3) due to urination, the fiber treatment agent 11 adhering to the surface of the fibers 10 constituting the antibacterial nonwoven fabric and the antibacterial agent 13 in the fiber treatment agent contained therein. detaches from the fibers 10 and dissolves in the urine. Urine in which the antibacterial agent 13 in the fiber treatment agent is dissolved penetrates the second sheet 8 and the enveloping sheet 9 and is absorbed and retained in the absorbent body 4 . Since the antibacterial agent 13 in the fiber treatment agent is dissolved in the urine that permeates the second sheet 8, the enveloping sheet 9 and the absorbent body 4, the antibacterial effect of the antibacterial agent is exerted and no odor is generated. On the other hand, since the in-fiber antibacterial agent 12 is carried by being kneaded inside the fibers 10, it remains carried in the fibers 10, and the body fluids absorbed by the topsheet 3 and the wearer's skin are removed. The antibacterial effect is exerted on body fluids that are close to the wearer's skin, such as body fluids that adhere to the surface. In this way, the antibacterial agent 13 in the fiber treatment agent and the antibacterial agent 12 in the fiber exert their antibacterial effects in different forms, thereby reliably suppressing the generation of foul odors due to urination, and the antibacterial effect of the antibacterial agents is sufficient. be able to perform.

On the other hand, in a conventional absorbent article provided with an antibacterial agent, as shown in FIG. Since the antibacterial agent and fiber treatment agent run off when urinating, the antibacterial agent does not remain on the topsheet, and the body fluids absorbed by the topsheet and the body fluids adhering to the wearer's skin give off a bad odor. could have occurred.

In addition, in conventional absorbent articles provided with an antibacterial agent, as described above, the surface of the fiber to which the fiber treatment agent is attached is coated so that the antibacterial agent is overcoated on the fiber treatment agent. There is a risk that the overcoated antibacterial agent will inhibit the effect of the fiber treatment agent and deteriorate the absorption performance. On the other hand, in the urine absorbing pad 1 according to the present invention, since the antibacterial agent 13 in the fiber treatment agent is mixed with the fiber treatment agent 11 attached to the surface of the fiber 10, the fiber treatment agent 11 It does not inhibit the effect of and does not deteriorate the absorption performance.

From the viewpoint of reliably exhibiting such an effect, the amount of the antibacterial agent remaining in the antibacterial nonwoven fabric after urination is larger than the amount of the antibacterial agent eluted from the antibacterial nonwoven fabric (top sheet 3) with urination. It is preferable to configure so that there are many. As a result, even after urination, a large amount of the antibacterial agent is placed near the wearer's skin surface, so that the antibacterial effect can be maintained at a position close to the skin surface, making it more hygienic. This configuration can be achieved by appropriately adjusting the content of the antibacterial agent 12 in the fiber and the content of the antibacterial agent 13 in the fiber treatment agent. Specifically, it is preferable that the content of the antibacterial agent 12 in the fibers contained per unit volume of the antibacterial nonwoven fabric is larger than the content of the antibacterial agent 13 in the fiber treatment agent. As a result, even if the antibacterial agent 13 in the fiber treatment agent is eluted from the antibacterial nonwoven fabric in a predetermined portion due to urination, the amount of the antibacterial agent 12 in the fiber treatment agent 12 in the fiber 10 is greater than the amount of the eluted antibacterial agent 13 in the fiber treatment agent. will remain in

DESCRIPTION OF SYMBOLS 1... Urinary absorption pad, 2... Leakproof sheet, 3... Surface sheet, 4... Absorbent, 5... Exterior sheet, 6... Side nonwoven fabric, 7... Thread-like elastic elastic member, 8... Second sheet, 9... Enveloping sheet, 10... Fiber, 11... Fiber treatment agent, 12... Antibacterial agent in fiber, 13... Antibacterial agent in fiber treatment agent

Claims (8)

In an absorbent article containing an absorbent body,
An antibacterial nonwoven fabric made of fibers with a fiber treatment agent attached to the surface and an antibacterial agent is disposed on the skin side of the absorbent body,
The antibacterial agent comprises a fiber antibacterial agent kneaded into the fiber and an antibacterial agent in the fiber treatment agent mixed with the fiber treatment agent ,
1. An absorbent article according to claim 1, wherein the antibacterial agent contained in the fiber comprises a sparingly water-soluble antibacterial agent, and the antibacterial agent contained in the fiber treatment agent comprises a water-soluble antibacterial agent. 2. The absorbent article according to claim 1 , wherein said sparingly water-soluble antibacterial agent comprises an inorganic antibacterial agent, and said water-soluble antibacterial agent comprises an organic antibacterial agent. 3. The absorbent article according to claim 1, wherein said fiber treatment agent is a hydrophilizing agent. A surface sheet is disposed on the skin side of the absorbent body so as to contact the skin surface of the wearer,
4. The absorbent article according to any one of claims 1 to 3, wherein at least part of said surface sheet is composed of said antibacterial nonwoven fabric. A top sheet is disposed on the skin side of the absorbent body to contact the wearer's skin surface, and a second sheet is disposed between the top sheet and the absorbent body,
5. The absorbent article according to any one of claims 1 to 4 , wherein at least part of said second sheet is composed of said antibacterial nonwoven fabric. The absorbent body is surrounded by an enveloping sheet,
6. The absorbent article according to any one of claims 1 to 5 , wherein at least a portion of said enveloping sheet disposed on the skin side of said absorbent body is composed of said antibacterial nonwoven fabric. 7. The absorbent article according to any one of claims 1 to 6 , wherein the content of the antibacterial agent in the fibers contained per unit volume of the antibacterial nonwoven fabric is greater than the content of the antibacterial agent in the fiber treatment agent. The absorbent article according to any one of claims 1 to 7 , wherein the antibacterial nonwoven fabric is provided on a portion corresponding to the wearer's bodily fluid discharge portion, and the antibacterial nonwoven fabric is not provided on other portions.

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