JP7295611B2 - Absorbent article and its manufacturing method - Google Patents

Description

The present invention relates to absorbent articles such as disposable diapers, incontinence pads, and incontinence pads. More specifically, the absorber contains a super absorbent polymer with a deodorizing function that exhibits a deodorizing function in response to body fluids such as urine. and a manufacturing method thereof.

Conventionally, as the absorbent article, pulp and super absorbent material are placed between a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric and a liquid-permeable top sheet such as a nonwoven fabric or a liquid-permeable plastic sheet. There is known one in which an absorbent body containing a polymer is interposed.

Various types of absorbent articles having a deodorant function have been developed in order to prevent offensive odors from being emitted when bodily fluids such as urine are absorbed.

For example, in Patent Document 1 below, a liquid-permeable layer, a liquid-impermeable layer, an absorbent layer positioned between these layers, and a cyclodextrin-containing layer positioned between the absorbent layer and the liquid-impermeable layer An absorbent article is disclosed comprising: In addition, by contacting the water contained in body fluids such as urine excreted from the wearer, the active ingredient retained in the cyclodextrin is gradually released (sustained release), and the action of the active ingredient is exhibited. It is described that the cyclodextrin may be a cyclodextrin that retains any flavor such as a natural flavor or a synthetic flavor so as to have a function, and a dispersing medium (for example, Polysiloxane oil, mineral oil, etc.) or in the form of a solution dissolved in a solvent.

Japanese Patent No. 5769896

However, in the absorbent article described in Patent Document 1, when the cyclodextrin-perfume complex containing the perfume is dispersed in a dispersion medium or dissolved in a solvent, the inclusion reaction equilibrium In such a state, the single fragrance may be liberated in the dispersion medium or solvent. function was expressed, and the function of the perfume was lowered when it came into contact with body fluids.

In addition, in the absorbent article described in Patent Document 1, cyclodextrin is arranged in a powdery or granular state as the cyclodextrin-containing layer. There is a risk that the deodorant function will be unevenly distributed due to uneven distribution of cyclodextrin during product transportation and use. In addition, when absorbent articles are manufactured at high speed, when they are arranged as powder particles, the powder particles tend to scatter or spill, making handling during production difficult.

Furthermore, in the absorbent article described in Patent Document 1, since the substance having a deodorant function is concentrated as the cyclodextrin-containing layer, the body fluid that does not reach this layer does not exhibit the deodorant function. At the same time, it is thought that the diffusibility of body fluids in the cyclodextrin-containing layer is low, so contact between the cyclodextrin and the body fluids is difficult, and the deodorant function is sometimes not fully satisfied.

Therefore, the main object of the present invention is to ensure that the deodorizing function is exhibited by the contact with the body fluid, and that the deodorizing function does not appear before the contact with the body fluid, and the deodorizing function of the absorbent article. To provide an absorbent article and a method for producing the absorbent article, which can be made almost uniform over the entirety and can be easily handled during production.

In order to solve the above problems, as the present invention according to claim 1, an absorbent article comprising an absorbent body containing pulp and a superabsorbent polymer,
A cyclodextrin complex in which a substance having a deodorant function is included in cyclodextrin is added to the surface of the superabsorbent polymer, and the cyclodextrin complex is added to 100 parts by mass of the superabsorbent polymer. Then, 0.01 to 1 part by mass of the superabsorbent polymer is added, and in addition to the cyclodextrin complex, a substance having a deodorant function is added to the surface of the superabsorbent polymer with respect to 100 parts by mass of the superabsorbent polymer. 0 to 0.1 parts by mass (excluding 0 parts by mass) of unencapsulated cyclodextrin is added,
In a predetermined region corresponding to the urination opening of the absorbent body, the pulp and the superabsorbent polymer having the cyclodextrin complex added to the surface thereof are respectively dispersed in at least a plane direction, and Provided is an absorbent article characterized in that the pulp and the superabsorbent polymer to which the cyclodextrin complex is not added to the surface are respectively dispersed at least in a plane direction in a region other than the region.

In the invention according to claim 1, a cyclodextrin complex in which a substance having a deodorant function such as a perfume is included in cyclodextrin is added to the surface of the superabsorbent polymer. Substances having a deodorant function, such as perfumes, are enclosed in cyclodextrin and therefore do not exhibit their function before contact with body fluids. The deodorizing function is exhibited only when the cyclodextrin complex comes into contact with excreted bodily fluids and the fragrance and the like are gradually released. Therefore, the deodorant function is not exhibited before contact with the body fluid, and the deodorant function is reliably exhibited by the contact with the body fluid.

In addition, since the cyclodextrin complex in which the substance with deodorizing function is clathrated is added to the surface of the superabsorbent polymer, it can surely come into contact with body fluids, and the substance with deodorizing function that has been released The deodorant effect can be reliably exhibited by the superabsorbent polymer, and the deodorant effect of the body fluid absorbed and retained by the superabsorbent polymer can be increased.

The superabsorbent polymer to which the cyclodextrin complex has been added is dispersed almost uniformly in the absorbent body together with the pulp, and moves less during the manufacturing process of the absorbent article and during the transportation of the product, so that the deodorant function is enhanced. Almost uniformity can be achieved over the entire absorbent article.

Furthermore, since the cyclodextrin complex is added to the surface of the superabsorbent polymer, the cyclodextrin complex may scatter or There is almost no spillage, making handling easier during manufacturing and the like.

The cyclodextrin complex is added in an amount of 0.01 to 1 part by mass with respect to 100 parts by mass of the superabsorbent polymer. By setting the amount to be added within this range, the deodorant effect can be reliably obtained, and the state in which the cyclodextrin complex is fixed to the surface of the superabsorbent polymer can be easily maintained. Further, in addition to the cyclodextrin complex, on the surface of the superabsorbent polymer, 100 parts by mass of the superabsorbent polymer is coated with an unclasped cyclodextrin that does not clathrate a substance having a deodorizing function. By adding 0 to 0.1 parts by mass (excluding 0 parts by mass), the non-inclusion cyclodextrin clathrates the odorous components of the excretion fluid upon contact with the excretion fluid, resulting in deodorization. effect will be obtained.

As the present invention according to claim 2, there is provided the absorbent article according to claim 1, wherein the substance having a deodorizing function is substantially not contained in a state where it is not included in the cyclodextrin.

In the invention according to claim 2, since the substance with deodorizing function such as perfume is not substantially contained in the state where it is not included in the cyclodextrin, the substance with deodorizing function such as perfume comes into contact with body fluids. The deodorizing function is ensured at the time of contact with bodily fluids without exhibiting its function before it is applied.

As described in detail above, according to the present invention, the deodorant function does not appear before contact with body fluids, and the deodorant function can be reliably exhibited by contact with body fluids, and the deodorant function is achieved by the absorbent article. can be made substantially uniform over the entire area, and handling during manufacturing is facilitated.

1 is a cross-sectional view of an absorbent article 1 according to the present invention; FIG. 1 is a schematic diagram of an absorbent body manufacturing apparatus 10; FIG. 5 is a cross-sectional view of a superabsorbent polymer 5; FIG.

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

The absorbent article 1 according to the present invention, as shown in FIG. An absorbent body 2 surrounded by a sheet 6 and a liquid-permeable top made of perforated or non-perforated non-woven fabric, perforated plastic sheet, or the like disposed so as to cover the skin side (surface side) of the absorbent body 2. It is mainly composed of a sheet 3 and a liquid-impermeable waterproof sheet 4 made of polyethylene or the like arranged so as to cover the non-skin side (back side) of the absorbent body 2. Specifically, can be exemplified by disposable diapers, incontinence pads, incontinence pads, sanitary napkins and the like. In the periphery of the absorbent body 2, the top sheet 3 extending outside the outer edge of the absorbent body 2 and the waterproof sheet 4 are joined by an adhesive such as hot melt, heat sealing, ultrasonic sealing or the like. , and an outer peripheral flap portion having no absorber 2 is formed on the outer periphery.

It is preferable that the absorbent body 2 is made of fluffed pulp in which powdery superabsorbent polymers 5 are dispersed. 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. When the wrapping sheet 6 surrounding the absorbent body 2 is provided, the wrapping sheet 6 is interposed between the top sheet 3 and the absorbent body 2 as a result. It is used to quickly diffuse bodily fluids and to prevent the regurgitation of these urines.

As shown in FIG. 2, the manufacturing apparatus 10 for the absorbent body 2 includes a defibrating device 12 for defibrating the pulp base paper 11 sent into the device, and a pulverizing device surrounding the defibrating device 12. It comprises a pulverized pulp supply casing 13 for transporting the pulverized pulp on an air flow, and a fiber stacking device 14 arranged at the downstream opening of the pulverized pulp supply casing 13 .

More specifically, the pulp base paper 11 drawn out from the pulp raw paper 16 arranged at the adjacent position of the absorbent body manufacturing device 10 is supplied to the defibrating device 12 . A large number of pulverizing blades are provided on the roll surface of the defibrating device 12 to finely defibrate the supplied pulp base paper 11 . The pulverized pulp 17 that has been shredded is conveyed downstream along with the air flow in the pulverized pulp supply casing 13 by the suction action of the fiber stacking device 14 .

The pulverized pulp supply casing 13 is provided with a polymer input port 18 on the upper surface side, and the powdery superabsorbent polymer 5 rides on the air flow together with the pulverized pulp 17 and flows into the stack disposed on the downstream side. It is supplied to the peripheral surface of the fiber device 14 . As will be detailed later, a cyclodextrin complex 7 is added to the surface of the superabsorbent polymer 5 . The superabsorbent polymer 5 is dispersed almost uniformly in the pulverized pulp 17 until it is supplied to the fiber stacking device 14 by riding on the air flow.

The absorbent body 2 composed of the pulverized pulp 17 and the superabsorbent polymer 5 stacked in the absorbent body forming recess of the fiber stacking device 14 is conveyed in the circumferential direction and transferred to the conveyor 19 . An enveloping sheet 6 covering the lower surface of the absorbent body 2 is supplied to the conveyor 19 so that the absorbent body 2 is laminated on the enveloping sheet 6 .

The absorbent body 2 uses an absorbent body having a substantially hourglass shape in plan view, and by narrowing the width of the absorbent body at the crotch part, the contact with the crotch part is weakened and the wearer feels stiff. It is also possible not to provide it, or a substantially rectangular shape may be used. The absorbent body 2 is preferably wrapped with a wrapping sheet 6 in order to retain its shape, prevent the superabsorbent polymer 5 from spilling, and improve diffusion of body fluids permeating the top sheet 3 .

As the liquid-permeable top sheet 3 covering the skin side (upper layer side) of the absorbent body 2, a perforated or non-perforated non-woven fabric or a porous plastic sheet, for example, is suitable. Used. The material fibers constituting the nonwoven fabric are not particularly limited. For example, in addition to synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers in which two or more of these are used, Composite fibers and the like can be exemplified, and nonwoven fabrics obtained by appropriate processing methods such as spunlace, spunbond, thermal bond, meltblown, needle punch, air through, and point bond methods can be used. can. Among these processing methods, the spunlace method is excellent in flexibility, the spunbond method is excellent in drapeability, and the thermal bond method, point bond method and air through method are bulky and have high compression recovery (=softness). Excellent at Further, the top sheet 3 may be composed of one sheet, or may be composed of a laminated sheet obtained by pasting two or more sheets together. When a large number of through-holes are formed in the liquid-permeable top sheet 3, urine and the like are rapidly absorbed, and the dry touch 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 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 also be preferably used.

The waterproof sheet 4 covering the non-skin side (lower layer side) of the absorbent body 2 is not particularly limited. Examples include a laminated nonwoven fabric provided with a nonwoven fabric and a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to a plastic film. This water-impermeable/moisture-permeable sheet is a microporous sheet obtained by, for example, forming a sheet by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching the sheet uniaxially or biaxially. Assuming that the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, so it is superior in terms of flexibility. Other methods include nonwoven fabrics using microdenier fibers, enhanced leakproofness by reducing the voids in the fibers by applying heat and pressure, and coating with superabsorbent resins or hydrophobic resins or water repellent agents. Therefore, a liquid-impermeable sheet can also be used without using a plastic film.

[Super absorbent polymer 5]
The superabsorbent polymer 5 includes powder as well as particles. As the superabsorbent polymer 5, the particle size used in this type of absorbent article can be used as it is. 99% by weight or more of the total, particularly preferably 99% by weight or more of the total 150-850 μm. It is preferable that the average particle diameter when not absorbing water is about 250 to 500 μm. In addition, it is desirable that the superabsorbent polymer 5 has an average particle diameter after water absorption of at least three times the average particle diameter at the time of non-water absorption, specifically 500 μm or more. The average particle size of the superabsorbent polymer 5 when not absorbing water 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 material of the superabsorbent polymer 5 can be used without any particular limitation, but a material having a water absorption of 40 g/g or more is suitable. As the superabsorbent polymer 5, there are starch-based, cellulose-based, synthetic polymer-based, etc., starch-acrylic acid (salt) graft copolymer, starch-acrylonitrile copolymer saponified product, cross-linked sodium carboxymethyl cellulose. and acrylic acid (salt) polymers can be used. In addition, for example, crosslinked polyacrylates, self-crosslinked polyacrylates, saponified products of acrylic acid ester-vinyl acetate copolymer crosslinked products, isobutylene/maleic anhydride copolymer crosslinked products, polysulfonate crosslinked products, , polyethylene oxide, polyacrylamide, and other water-swellable polymers that are partially crosslinked. Of these, acrylic acid or acrylate-based agents are preferred because of their excellent water absorption and water absorption rate. As for the shape of the superabsorbent polymer 5, it is preferable that it is in the form of particles that are usually used, but it is also possible to use other shapes.
As the superabsorbent polymer 5, one having a water absorption rate of 70 seconds or less, particularly 40 seconds or less is preferably used. If the water absorption speed is too slow, the liquid supplied into the absorbent body 2 tends to return to the outside of the absorbent body 2, which is a so-called reversion. It is possible to adjust the absorption capacity (water absorption capacity) and the absorption speed by adjusting the crosslink density and the crosslink density gradient in the manufacturing process of the superabsorbent polymer 5 having water absorption performance.
The basis weight of the superabsorbent polymer 5 can be appropriately determined according to the absorption amount required for the use of the absorbent body 2 . Therefore, although it cannot be generalized, it can be 50 to 350 g/m ² . If the basis weight of the polymer is less than 50 g/m ² , it becomes difficult to ensure the water absorption. 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.

As shown in FIG. 3, a cyclodextrin complex 7 is added to the surface of the superabsorbent polymer 5, in which a substance having a deodorant function such as perfume is included in cyclodextrin. That is, the cyclodextrin complex 7 is added to the surface of the superabsorbent polymer 5 at the stage of manufacturing the superabsorbent polymer 5, and is handled in the subsequent process of manufacturing the absorbent body 2 and the process of assembling the absorbent article 1. There is no

As the substance having a deodorizing function such as perfume, either a natural perfume or a synthetic perfume may be used, or a combination thereof may be used. Specific examples of substances having the deodorant function include garnet, benzoin, castoreum, spirit cat, clove oil, galbanum, jasmine absolute, labtanum, yerba mate, melilot, mimosa, musk tonquin, myrrh, oak moss or moss de chène. , frankincense, juniper incense, orris, batouli, rosemary oil, sandalwood oil, vetiver oil, natural fragrances such as violet leaf absolute, higher alcohols, aldehydes, benzaldehyde, benzoic acid, cinnamic acid, cinnamic aldehyde, cinnamic alcohol, These include, but are not limited to, coumarins, esters, indoles, ketones, salicylic acids and related compounds, terpenoids, various synthetic fragrances such as vanillin, or mixtures of two or more thereof. Commercially available substances such as fragrances can be widely used as the substance having the deodorant function. A highly volatile perfume is preferably used as the substance having a deodorant function.

In addition, as the substance having the deodorizing function, a substance that has a deodorizing effect itself or a substance that has a harmonizing effect of generating a new scent that does not cause discomfort in harmony with the unpleasant odor of excrement is used. be able to.

The substance having the deodorant function is added to the surface of the superabsorbent polymer 5 as a cyclodextrin complex 7 encapsulated in cyclodextrin. This provides the following effects.

Since a substance having a deodorizing function such as perfume is enclosed in cyclodextrin, the substance such as perfume does not exhibit its function before contact with body fluids. functional deterioration is less likely to occur. When the absorbent article 1 is used, the cyclodextrin complex 7 comes into contact with excreted bodily fluids, and substances such as perfume are gradually released.

In addition, since the cyclodextrin complex 7 is added to the surface of the superabsorbent polymer 5, the cyclodextrin complex 7 can reliably come into contact with body fluids by the superabsorbent polymer 5 absorbing water. The deodorizing effect of the substance having a deodorizing function released from 7 can be reliably obtained. In addition, even when the amount of excretion is small, the high water-absorbent polymer 5 has a structure in which the excreted liquid is easily absorbed and retained due to the liquid diffusion effect of the pulp that constitutes the absorbent body 2, so that the deodorizing function is achieved. The deodorant effect of the substance possessed can be reliably obtained.

The superabsorbent polymer 5 to which the cyclodextrin complex 7 has been added is distributed substantially uniformly in the absorbent body 2 together with the pulp, and during the manufacturing process of the absorbent article 1, product transportation, or absorption. Since the absorbent article 1 does not easily move during use, the deodorizing function is not unevenly distributed, and the deodorizing function can be substantially uniform over the entire absorbent article 1 .

Furthermore, the cyclodextrin complex 7 is added to the surface of the superabsorbent polymer 5 and adhered to the surface of the superabsorbent polymer 5, so during the manufacturing process of the absorbent article 1 or during product transportation, or During use of the absorbent article 1, the cyclodextrin complex 7 hardly scatters or spills, which facilitates handling during manufacture.

As for defecation, the addition of the cyclodextrin complex 7 to the surface of the superabsorbent polymer 5 increases the surface area that can come into contact with water, so even a small amount of water contained in stool exhibits a deodorizing effect. can do.

The arrangement of the superabsorbent polymer 5 with respect to the absorbent body 2 can be any one of the following three embodiments depending on how the deodorant function is exhibited.

In the first embodiment, the fluff pulp and the super absorbent polymer 5 having the cyclodextrin complex 7 added to the surface thereof are dispersed at least in the planar direction of the absorbent body 2 . In the first embodiment, the deodorant function can be exhibited almost equally immediately after excretion for a plurality of times of excretion. As a specific example, 5.6 g of fluff-like pulp and 10.5 g of super absorbent polymer to which 0.3 parts by mass of cyclodextrin complex 7 is added to the surface with respect to 100 parts by mass of super absorbent polymer, These fluff-like pulp and superabsorbent polymer 5 can be dispersedly arranged in an absorbent body 2 having a substantially hourglass-like planar shape of 0.05 m ² . In the first embodiment, before excretion, the deodorizing effect of substances with a deodorizing function, such as perfumes included in cyclodextrin, is not exerted, and excretion ensures that the excrement diffuses in the absorbent body. The deodorant function is exhibited by contacting the cyclodextrin complex 7 at the beginning. In addition, since the cyclodextrin complex 7 is added to the surface of the superabsorbent polymer 5, the superabsorbent polymer 5 is dispersed throughout the absorbent body 2, so that the cyclodextrin complex 7 is also added to the absorbent body 2. are distributed throughout the Since the state in which the superabsorbent polymer 5 is dispersed throughout the absorbent body 2 does not change due to vibrations during the manufacturing stage of the absorbent article or the transportation stage of the product, the dispersed state of the cyclodextrin complex 7 does not change either. The superabsorbent polymer 5 may be dispersed at least in the planar direction of the absorbent body 2, and may be dispersed in the thickness direction of the absorbent body 2. It is also possible to avoid dispersive arrangement by laminating a layer containing the organic polymer 5 and a layer not containing the organic polymer 5 .

Next, in the second embodiment, in a predetermined region corresponding to the urination opening of the absorbent body 2, the fluff-like pulp and the superabsorbent polymer 5 having the cyclodextrin complex 7 added to the surface thereof are dispersed at least in the planar direction. Along with being arranged, in the other region of the absorbent body 2, the fluffy pulp and the superabsorbent polymer 5 to which the cyclodextrin complex 7 is not added are respectively dispersed at least in the planar direction. In the second embodiment, the deodorant function is reliably exhibited at the time of the first excretion, and when the absorbed excrement spreads outside the predetermined area over time, or after the second excretion. When it spreads outside the predetermined area due to excretion, the deodorizing function is not exhibited, and it is made possible to know that there was excretion. The predetermined area preferably has a planar dimension of 30 to 70 mm, preferably about 50 mm, in the longitudinal direction and the width direction of the absorbent article, and the planar shape thereof is a square, a circle, an ellipse, or the like. It's good. Further, the weight of the superabsorbent polymer 5 to which the cyclodextrin complex 7 is added to the surface arranged in the predetermined region is 1 to 10 of the weight of the superabsorbent polymer 5 arranged in the entire absorbent body 2. %, preferably 3 to 7%. As a specific example, the absorbent body 2 as a whole is made of 5.6 g of fluff pulp and 10.5 g of super absorbent polymer and is formed in a substantially hourglass-shaped planar shape of 0.05 m ² corresponding to the urination opening. Of the 10.5 g of the superabsorbent polymer 5, 0.3 parts by mass of the cyclodextrin complex 7 per 100 parts by mass of the superabsorbent polymer is added to the surface of the predetermined region consisting of a 50 mm square. 0.5 g of the superabsorbent polymer may be dispersedly arranged, and 10 g of the superabsorbent polymer to which the remaining cyclodextrin complex 7 is not added to the surface may be dispersedly arranged in other regions. In the second embodiment, since a substance having a deodorant function such as a perfume is enclosed in cyclodextrin, the deodorant effect is not exhibited before excretion, and the excrement is 50 mm square at the time of the first excretion. The deodorizing effect is exhibited by diffusing in a predetermined area. In addition, since the cyclodextrin complex 7 is added to the surface of the superabsorbent polymer 5, it is dispersed in the predetermined region of the absorbent 2 due to vibrations during the manufacturing stage of the absorbent article and the transportation stage of the product. does not change, the dispersed arrangement state of the cyclodextrin complex 7 does not change, and it becomes possible to reliably respond to the first excretion. The superabsorbent polymer 5 may be dispersed at least in the planar direction of the absorbent body 2, and may be dispersed in the thickness direction of the absorbent body 2. It is also possible to prevent the dispersed arrangement by laminating a layer containing the organic polymer 5 and a layer not containing the organic polymer 5 . However, in the predetermined region, this region corresponds to the urination opening, and the rate at which urine diffuses in the thickness direction due to the pressure during urination is large. It is desirable that the elastic polymer 5 is dispersed in both the planar direction and the thickness direction of the absorbent body 2 .

In the third embodiment, the fluff pulp and the superabsorbent polymer 5 to which the cyclodextrin complex 7 is not added are dispersed at least in the planar direction in a predetermined region corresponding to the urination opening of the absorbent body 2. In addition, in the other region of the absorbent body 2, the fluff pulp and the superabsorbent polymer 5 to which the cyclodextrin complex 7 is added are dispersed at least in the planar direction. In the third embodiment, the deodorant effect is not exerted immediately after excretion so that it can be recognized that there was excretion, and the deodorant effect is exerted after a certain period of time has elapsed. The predetermined area can be formed in the same manner as in the second embodiment. Further, the weight of the superabsorbent polymer 5 to which the cyclodextrin complex 7 is not added to the surface, which is arranged in the predetermined region, is 1 to 10% of the weight of the superabsorbent polymer 5 arranged in the entire absorbent body 2. , preferably 3 to 7%. As a specific example, the absorbent body 2 as a whole is made of 5.6 g of fluff pulp and 10.5 g of super absorbent polymer and is formed in a substantially hourglass-shaped planar shape of 0.05 m ² corresponding to the urination opening. Among the 10.5 g of the super absorbent polymer 5, 0.5 g of the super absorbent polymer to which the cyclodextrin complex 7 is not added to the surface is dispersed in the predetermined area consisting of a 50 mm square, and the other 10 g of the superabsorbent polymer to the surface of which 0.3 parts by mass of the cyclodextrin complex 7 is added to the remaining 100 parts by mass of the superabsorbent polymer can be dispersed in the area. In the third embodiment, since a substance having a deodorant function such as a perfume is enclosed in cyclodextrin, the deodorant effect is not exerted before excretion, and immediately after excretion, the excrement becomes a cyclodextrin complex. Since the body 7 contacts only the superabsorbent polymer 5 that is not added to the surface, the deodorizing effect is not exhibited. Then, after a certain period of time has passed since excretion, the absorbed excrement diffuses outside the predetermined region and comes into contact with the superabsorbent polymer 5 to which the cyclodextrin complex 7 is added to the surface, thereby exhibiting a deodorizing effect. be done. In addition, since the cyclodextrin complex 7 is added to the surface of the superabsorbent polymer 5, it is dispersed in the predetermined region of the absorbent 2 due to vibrations during the manufacturing stage of the absorbent article and the transportation stage of the product. does not change, the dispersed arrangement state of the cyclodextrin complex 7 does not change, the deodorant function is not exerted immediately after the first excretion, and the deodorant function can be reliably exerted after a certain period of time.

The cyclodextrin complex 7 is preferably added in an amount of 0.01 to 1 part by mass, preferably 0.1 to 1 part by mass, per 100 parts by mass of the superabsorbent polymer 5. If it is less than 0.01 part by mass, the deodorizing effect is small, and if it is more than 1 part by mass, it is difficult to maintain the state in which the cyclodextrin complex 7 is fixed to the surface of the superabsorbent polymer 5, and the surface of the superabsorbent polymer 5 Easy to peel off from.

As shown in the following sensory evaluation test, less than 0.01 parts by weight, for example, 0.005 parts by weight of the cyclodextrin complex is added to the surface with respect to 100 parts by weight of the superabsorbent polymer. Absorbent articles containing a polymer do not give a sufficient deodorizing effect after urination, although the wearer hardly perceives the scent before urination and does not mistakenly think that the absorbent article has urinated. On the other hand, an absorbent article comprising a superabsorbent polymer in which more than 1 part by weight, for example 2 parts by weight of a cyclodextrin complex is added to the surface with respect to 100 parts by weight of the superabsorbent polymer, While wearing it, I feel the scent even before urinating and misunderstand that I urinated. The cyclodextrin complex is slowly released depending on the humidity in the air, and when the amount of sustained release exceeds a certain level, the wearer and the people around the wearer sensuously feel the deodorant and fragrance. The range in which the deodorizing effect is sufficiently exhibited after use and the deodorizing effect and fragrance before urination are not perceived is 0.01 to 1 part by mass with respect to 100 parts by mass of the superabsorbent polymer.

(Sensory evaluation test)
Test method: For an absorbent article having a superabsorbent polymer in which a predetermined amount of a cyclodextrin complex is added to the surface of 100 parts by mass of the polymer, the scent before urination is sensory evaluated in 7 stages (1: weak scent → 7: strong scent), and the degree of deodorization after use (after excretion) is sensory evaluated in 7 stages (1: weak deodorization → 7: strong deodorization).

Test results:
(1) In an absorbent article comprising a superabsorbent polymer in which 0.005 parts by mass of a cyclodextrin complex is added to the polymer surface with respect to 100 parts by mass of the superabsorbent polymer,
Fragrance evaluation before use: 1
Deodorizing evaluation after excretion: 2
(2) In an absorbent article comprising a superabsorbent polymer in which 0.3 parts by mass of a cyclodextrin complex is added to the polymer surface with respect to 100 parts by mass of the superabsorbent polymer,
Fragrance evaluation before use: 2
Deodorizing evaluation after excretion: 6
(3) In an absorbent article comprising a superabsorbent polymer in which 2 parts by mass of a cyclodextrin complex is added to the polymer surface with respect to 100 parts by mass of the superabsorbent polymer,
Fragrance evaluation before use: 6
Deodorizing evaluation after excretion: 7
In addition to the cyclodextrin complex 7, on the surface of the superabsorbent polymer 5, 100 parts by mass of the superabsorbent polymer 5 is coated with an unencapsulated cyclodextrin that does not include a substance having a deodorizing function. may be added from 0 to 0.1 parts by mass. By adding a predetermined amount of non-encapsulated cyclodextrin to the surface of the superabsorbent polymer 5, the non-encapsulated cyclodextrin clathrates the odorous components of the excreted fluid upon contact with the excreted fluid, resulting in a deodorizing effect. will be available.

The substance having a deodorant function is added to the superabsorbent polymer 5 as a cyclodextrin complex 7 in which all of them are included in the cyclodextrin, and is substantially not contained in a state where it is not included in the cyclodextrin. It is preferable to The fact that the substance with deodorizing function is not substantially contained in a state where it is not clathrated in cyclodextrin means that the substance with deodorizing function is not added alone to the surface of superabsorbent polymer 5, and cyclodextrin When adding the complex 7 to the surface of the superabsorbent polymer 5, by dissolving the cyclodextrin complex 7 in a solvent, a part of the cyclodextrin complex releases a substance having a deodorant function, and the solvent It does not exclude those in which a substance having a deodorant function exists alone.

Next, among the methods for producing the superabsorbent polymer 5, a method of adding the cyclodextrin complex 7 to the surface of the superabsorbent polymer 5 will be described in detail.

A solution is prepared by dispersing the cyclodextrin complex 7 in which the substance having the deodorizing function is included in the cyclodextrin in a solvent, and when the superabsorbent polymer 5 is surface-crosslinked, the solution is superabsorbent. Sprinkle on the surface of polymer 5.

The dispersion solution of the cyclodextrin complex 7 preferably contains water. In other words, it is preferable that the cyclodextrin complex aqueous solution uses water as a solvent in which the cyclodextrin complex 7 is dispersed.

When the cyclodextrin complex 7 comes into contact with water, it gradually releases a substance having a deodorizing function. As a result, it becomes dispersed in the solvent.

At this time, the concentration of the cyclodextrin complex 7 in the solution is preferably 1 to 15% by mass, particularly 5 to 15% by mass with respect to 100% by mass of the solvent. This makes it possible to add the substance having a deodorizing function to the surface of the superabsorbent polymer 5 without releasing it from the cyclodextrin complex 7 .

In order to spray the aqueous solution of the cyclodextrin complex 7 on the superabsorbent polymer 5, a known method can be appropriately employed, for example, a method of spraying the aqueous solution from a spray nozzle, or a method of dropping the aqueous solution little by little. It can be a method, etc.

A surface cross-linking agent is preferably added to the aqueous solution of the cyclodextrin complex 7 . That is, it is preferable to use an aqueous solution in which the cyclodextrin complex 7 and the surface cross-linking agent are dissolved in the solvent (water). As a result, the surface cross-linking of the superabsorbent polymer 5 and the addition of the cyclodextrin complex 7 are performed simultaneously, and the cyclodextrin complex 7 can firmly adhere to the surface of the superabsorbent polymer 5, and the manufacturing process can be simplified. , and compared to separately spraying an aqueous solution to which a surface cross-linking agent is added and an aqueous solution to which a cyclodextrin complex is added, the amount of water to be sprayed on the superabsorbent polymer 5 can be reduced as a whole, and the drying process described later becomes easier. The amount of the cyclodextrin complex 7 to be added at this time is preferably within the range of the concentration of the cyclodextrin complex 7 to the solvent according to the amount of water used in the aqueous solution of the surface cross-linking agent.

It is also possible to separately prepare an aqueous solution of the cyclodextrin complex 7 and an aqueous solution of the surface cross-linking agent, and spray the respective aqueous solutions on the surface of the superabsorbent polymer 5 in separate steps. In this case, it is preferable to apply an aqueous solution of the cyclodextrin complex 7 after spraying an aqueous solution of the surface cross-linking agent and performing a drying treatment. As a result, the cyclodextrin complex 7 can be adhered to the surface of the superabsorbent polymer 5 in a state in which the superabsorbent polymer 5 is prevented from swelling due to water absorption.

After the aqueous solution spraying step described above, the superabsorbent polymer 5 is heated to dry the water. As a result, water in the aqueous solution is removed, and as shown in FIG. 3, the cyclodextrin complex 7 adheres to the surface of the superabsorbent polymer 5 in a fine powder state. As a drying means, a known method such as a method using hot air can be appropriately used.

DESCRIPTION OF SYMBOLS 1... Absorbent article, 2... Absorbent body, 3... Top sheet, 4... Waterproof sheet, 5... Super absorbent polymer, 6... Enveloping sheet, 7... Cyclodextrin complex, 10... Production apparatus, 11... Pulp base paper , 12... defibration device, 13... pulverized pulp supply casing, 14... stacking device, 16... raw pulp fabric, 17... pulverized pulp, 18... polymer inlet

Claims (2)

In an absorbent article comprising an absorbent body containing pulp and a superabsorbent polymer,
A cyclodextrin complex in which a substance having a deodorant function is included in cyclodextrin is added to the surface of the superabsorbent polymer, and the cyclodextrin complex is added to 100 parts by mass of the superabsorbent polymer. Then, 0.01 to 1 part by mass of the superabsorbent polymer is added, and in addition to the cyclodextrin complex, a substance having a deodorant function is added to the surface of the superabsorbent polymer with respect to 100 parts by mass of the superabsorbent polymer. 0 to 0.1 parts by mass (excluding 0 parts by mass) of unencapsulated cyclodextrin is added,
In a predetermined region corresponding to the urination opening of the absorbent body, the pulp and the superabsorbent polymer having the cyclodextrin complex added to the surface thereof are respectively dispersed in at least a plane direction, and The absorbent article, wherein the pulp and the superabsorbent polymer to the surface of which the cyclodextrin complex is not added are respectively dispersed in a region other than the above, at least in a planar direction. 2. The absorbent article according to claim 1 , wherein said substance having a deodorant function is substantially not included in said cyclodextrin in a state where it is not clathrated.

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