JP6186136B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a disposable diaper, a urine absorption pad, an incontinence pad, and the like, and more particularly, to an absorbent article capable of informing the appropriate diaper replacement time by emitting a scent.

  Conventionally, disposable diapers with a so-called notification function have been known, which can recognize the presence or absence of excretion from the outside by providing an indicator that causes a visual change such as discoloration by contact with the excrement when it is excreted. It has been. However, in the notification function by such discoloration etc., if you wear clothes on the diaper, you need to take off clothes one by one or look into the clothes and check the indicator, which is troublesome. When neglecting such confirmation work or overlooking the discoloration of the indicator, the amount of urination exceeds the absorption capacity of the diaper, which often causes leakage.

  For this reason, what is provided with the notification function which produces the olfactory change which emits a fragrance by contact with excrement, not the notification function by discoloration etc. is proposed. For example, in Patent Document 1 below, hydrolase acts for the first time by urination, defecation, etc. to an absorbent article, the perfume precursor substance is hydrolyzed to give off a scent, and the generation of this scent causes urination and defecation. It has been disclosed that it is possible to confirm whether or not this has occurred. Further, in Patent Document 2 below, a water-soluble coating material is used in the liquid-absorbent core or between the liquid-permeable core and the liquid-impervious back sheet or between the liquid-absorbent core and the liquid-permeable surface sheet. Disposable diapers that contain a volatile material inclusion body containing a volatile material, dissolve a water-soluble coating material with moisture of excrement, and leak volatile organisms are disclosed. The volatile organism inclusion body is accommodated in at least a region where excrement adheres, for example, a portion corresponding to the crotch. Further, Patent Document 3 below discloses an absorbent article applied to a liquid absorbent material by uniformly spreading, mixing, or distributing water activated encapsulated fragrance on the liquid absorbent material. In the following Patent Document 4, it has a first fragrance part and a second fragrance part that emit fragrance by contacting with excrement, and the first fragrance part and the second fragrance part are given different fragrances. The first fragrance portion is disposed in a urine receiving portion that is in contact with the urination portion of the wearer, and the second fragrance portion is disposed at a longitudinal end portion of the absorbent body, avoiding the urine receiving portion. An absorbent article is disclosed.

JP-A-8-126661 Japanese Patent Laid-Open No. 10-85255 Japanese National Patent Publication No. 8-508423 JP 2011-103923 A

  However, in the absorbent articles described in Patent Documents 1 to 3, since the fragrance that generates a scent by contact with excreta is uniformly distributed in the absorbent body or disposed in the center of the crotch, the first time The scent is emitted from the time when urination occurs, and it can be recognized that urination was caused by the scent, but it did not inform the appropriate diaper change timing of whether or not to change diapers. In other words, although the amount of urination is small at the first time and there is enough room for the absorption capacity of the absorbent body, there is a scent, so it is not time to replace the diaper and it is not time to replace it. It took a lot of time, and there was a waste of unavoidably changing to a new diaper.

  On the other hand, in the absorbent article described in Patent Document 4, the first fragrance portion and the second fragrance portion are composed of a water-soluble resin layer containing a volatile substance having a fragrance-emitting property and a water-soluble resin layer. It is difficult to set the shape of the perfume range freely, because it is composed of a fragrance spreading layer having a water-soluble resin layer substantially free of volatile substances provided on one side. A process for arranging the sheet material composed of the fragrance-diffusing layer is required separately, and there is a manufacturing effort that requires measures such as positioning and dropping prevention.

  Accordingly, a main problem of the present invention is to provide an absorbent article that can notify the appropriate diaper replacement time by the scent, can freely set the shape of the fragrance range, and has a simplified manufacturing process.

As the present invention according to claim 1 to solve the above problems, have at least the absorber, water-soluble fragrances microencapsulated or powdered emit fragrance by contact with body fluids, the outer peripheral portion of the absorbent body An absorbent article that is applied to at least a portion, and is not applied to a portion corresponding to the body fluid discharge portion of the absorbent body and its periphery ,
The application range of the water-soluble fragrance is such that a plurality of strip-shaped ranges along the width direction are arranged at both ends in the front-rear direction of the absorber with a space in the front-rear direction from the absorber center side, and the absorber The absorbent article is characterized in that the band-shaped area located on the center side of the tape is formed so that the length in the width direction and / or the length in the front-rear direction is gradually reduced .

  In the first aspect of the present invention, a microencapsulated or powdered water-soluble fragrance that emits a scent by contact with a body fluid is applied to at least a part of the outer peripheral portion of the absorber, and corresponds to the body fluid discharge portion of the absorber. Since it is not applied to the part and its periphery, it does not emit a scent when there is excretion that is absorbed and held only in the absorber central part at the first time, or when there is excretion after the second time or Even if it is the first excretion, it is a large amount, and the excrement absorbed and held by the absorber reaches the outer periphery of the absorber and emits a scent when approaching the absorption capacity of the absorber. This scent makes it possible to recognize the appropriate diaper changing time.

  In addition, the water-soluble fragrance is applied to a predetermined part of the absorbent body in a microencapsulated or powdered form, and does not have a sheet material containing the fragrance as in the prior art. Can be set freely, and since there is no worry of positioning or dropping, the manufacturing process can be simplified.

Further, the application range of the water-soluble fragrance is such that a plurality of strip-shaped ranges along the width direction are disposed at both ends in the front-rear direction of the absorbent body and spaced from the center of the absorbent body in the front-rear direction. As the band-shaped range located on the center side of the body is formed so that the length in the width direction and / or the length in the front-rear direction becomes smaller , the excrement diffusion range gradually approaches the peripheral side. The scent is strengthened step by step or continuously, so that it is possible to more reliably recognize that it is time to change diapers.

As the present invention according to claim 2, there is provided the absorbent material according to claim 1, wherein the water-soluble fragrance is also applied to both side portions in the width direction of the absorber.

Invention described in claim 2, wherein, by also applied to both sides in the width direction of the absorbent body the water-soluble perfume emits fragrance captures excrement diffused, which was to inform the timing changing diapers is there.

As the present invention according to claim 3 , there is provided the absorbent article according to any one of claims 1 and 2 , wherein a water-soluble fragrance that emits a different scent is applied to each of the belt-shaped ranges .

In the invention according to claim 3 , by applying water-soluble fragrances that emit different scents to the respective strip-shaped ranges, the scents are gradually scented as the diffusion range of excrement gradually expands from the central side to the peripheral side. The diaper exchange time can be identified by the type of scent.

As the present invention according to claim 4 , the water-soluble fragrance is mixed with the one applied to the band- shaped range on the absorber center side and the one applied to the band-shaped range on the periphery side of the absorber, The absorptive article according to claim 3 constituted so that it may change into other fragrances.

In the invention of claim 4 above, when applying water-soluble fragrances that emit different scents to each band-shaped range, the water-soluble fragrance applied to the band-shaped range on the center side of the absorber, and the absorber peripheral side (immediately) When mixed with the water-soluble fragrance applied to the outer band, the water-soluble fragrance that changes to another fragrance different from the single fragrance of the water-soluble fragrance on the central side and the water-soluble fragrance on the outer side is mixed. By using it, it is possible to prevent a situation in which when both scents are emitted, they cannot be notified of the diaper replacement time because they are erased from each other.

As the present invention according to claim 5 , embossed recesses are provided at both ends in the front-rear direction or both sides in the width direction of the absorber along a direction substantially perpendicular to the direction from the center side to the peripheral side of the absorber. An absorbent article according to any one of claims 1 to 4 is provided.

In the invention according to claim 5 , the both ends of the absorber in the front-rear direction or both sides in the width direction are substantially perpendicular to the direction from the center side to the peripheral side of the absorber, that is, the excrement diffusion range. The embossed recess is provided along the direction along the outer edge of the. The range of excrement diffusion is not certain depending on the wearer's posture and the fiber orientation direction of the absorbent body, but by providing this embossed recess, mismatching of the absorbent body in the longitudinal and lateral directions is controlled. This makes it possible to adjust the relationship between the absorbent capacity of the absorber and the generation time of the scent.

As the present invention according to claim 6 , in the absorbent article, the absorbent body surrounded by the encapsulating sheet is interposed between the liquid-permeable top sheet and the back sheet, and the absorbent body and the encapsulating sheet A bottom sheet is interposed between and
The absorbent article according to any one of claims 1 to 5 , wherein the water-soluble fragrance is applied between the bottom sheet and the encapsulating sheet and / or between the encapsulating sheet and the back sheet. .

The invention according to claim 6 defines a preferable portion of the cross-sectional position where the water-soluble fragrance is applied. Specifically, it is set between the bottom sheet and the encapsulating sheet and / or between the encapsulating sheet and the back sheet in consideration of the burden on the wearer's skin and the diffusibility of the scent.

  As described above in detail, according to the present invention, it is possible to notify the appropriate diaper replacement time by the scent, and the shape of the fragrance range can be freely set, and the manufacturing process can be simplified.

It is a partial fracture development view of disposable diaper 1 concerning the present invention. It is the II-II arrow directional view. It is a top view of the absorber 13 which shows the application range 30 of a water-soluble fragrance | flavor. It is a top view of the absorber 13 which shows the application range 30 of the water-soluble fragrance | flavor which concerns on another form. It is a top view of the absorber 13 which shows the application range 30 of the water-soluble fragrance | flavor which concerns on another form. It is a top view of the absorber 13 which shows the application range 30 of the water-soluble fragrance | flavor which concerns on another form. It is a top view of the absorber 13 which shows the application range 30 of the water-soluble fragrance | flavor which concerns on another form. It is a top view of the absorber 13 which provided the embossing recessed part 32. FIG. (A) is the top view of the absorber 13 which shows the spreading | diffusion area | region when the embossing recessed part 32 is not provided, and (B) is the embossing recessed part 32 provided. It is a manufacturing-process figure of the absorber 13 which shows an example of the arrangement | positioning procedure of a water-soluble fragrance | flavor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[Basic configuration of disposable diaper 1]
As shown in FIG. 1, the disposable diaper 1 according to the present invention includes a liquid-permeable top sheet 11 made of a nonwoven fabric, a back sheet 12 made of polyethylene, and the liquid-permeable top sheet 11 and the back sheet 12. An absorbent body 13 made of cotton-like pulp or the like interposed between them, an encapsulating sheet 14 surrounding the absorbent body 13, and a hydrophilic intervening between the encapsulating sheet 14 and the liquid-permeable top sheet 11. An absorbent main body 10 having a three-dimensional gather BS, BS formed on both sides of the surface, and an exterior sheet 20 integrally provided on the outer surface side of the back sheet 12. The front body F and the back body B of the exterior sheet 20 are joined at both side parts 21 and 22 in the product state, so that a waist opening and a pair of left and right leg openings There is a pants-type diaper of the formed structure.

  As described above, the absorbent main body 10 includes a fiber aggregate such as cotton-like pulp and a superabsorbent polymer between the liquid-permeable top sheet 11 made of nonwoven fabric and the like and the back sheet 12 made of polyethylene or the like. This is a structure in which an absorbent body 13 made of a superabsorbent or the like is interposed, and absorbs and retains body fluids.

The absorbent body 13 is preferably a basis weight of about 50~600g / ^{m 2,} about 200 to 400 g / ^{m 2} is more preferable. Examples of the superabsorbent polymer include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process, the superabsorbent polymer having the water absorption capability can adjust the water absorption (absorption capacity) and the water absorption speed by adjusting the crosslink density and the crosslink density gradient. The content ratio of the superabsorbent polymer in the absorbent body 13 is suitably about 30 to 70%, but is not limited thereto. Also, in the illustrated example, a shape formed with a substantially square shape in plan view is used, and the width dimension is a dimension width that does not give the wearer a feeling of gore by hitting the crotch portion. Although the fiber orientation direction of the absorbent body 13 is not particularly limited, it is generally formed in a longitudinally long direction in the front-rear direction. Therefore, in order to prevent side leakage, the diffusion in the absorbent body width direction is suppressed, and the absorbent body 13 diffuses in the front-rear direction of the absorbent body. In order to facilitate, it is preferable that the direction along the front-rear direction is mainly the fiber orientation direction.

The absorber 13 is surrounded by the encapsulating sheet 14. As the encapsulating sheet 14, a paper material such as tissue or a liquid-permeable sheet such as a nonwoven fabric can be used. However, the fiber aggregate, the high-absorbent material, or the water-soluble fragrance contained in the absorber 13 does not escape. What has the fiber density of can be used. In addition, when the water-soluble fragrance is surrounded by the encapsulating sheet 14, a thin and low basis weight is suitable for facilitating the scent to be diffused to the outside. The thickness is preferably about 0.05 to 0.5 mm, more preferably about 0.05 to 0.2 mm. The basis weight is preferably about 5 to 25 g / ^{m 2,} about 5 to 15 g / ^{m 2} is more preferable. When using a non-woven fabric, a non-woven fabric processed by a spunbond method or an SMS method, particularly a non-woven fabric processed by an SMS method, is preferred because of its excellent balance between thinness and strength. In addition, as long as the surface of the absorber 13 at least the surface side (skin contact surface side) of the encapsulating sheet 14 is not water-repellent, the hydrophilicity of the sheet is not particularly limited. Moreover, if it is comprised so that the said fiber assembly contained in the absorber 13, the high absorbent material, or a water-soluble fragrance | flavor may not come out, the front side surface or back side surface or both of the encapsulating sheet 14 may be omitted. Is possible. In particular, since the leak-proof sheet 12 is usually disposed on the back side of the absorber 13, the back side surface of the encapsulating sheet 14 may be omitted if there is no problem in the manufacturing process.

As the liquid-permeable top sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, 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 spun bond method, an SMS method, a thermal bond method, an air through method, a point bond method, a melt blown method, or a needle punch method can be used. In particular, the nonwoven fabric processed by the spunbond method or the SMS method is suitable in that it has a good balance between thinness and strength, and the nonwoven fabric processed by the air-through method is quick to absorb and excellent in dry touch even at a low basis weight. Therefore, it is preferable. These may be a sheet made of two or more layers in a sheet composed of a single layer (the same type or plural types) but, as the basis weight of the total, preferably from 10 to 40 g / ^{m 2,} more preferably 10~22g / ^{m 2} 10 to 15 g / m ² is particularly preferable. The thickness is preferably 1 mm or less, more preferably 0.5 mm or less, and particularly preferably 0.3 mm or less. When a large number of through holes are formed in the liquid permeable top sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable top sheet 11 extends to the back side of the absorbent body 13 around the side edge of the absorbent body 13.

As the back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impervious plastic sheet such as polyethylene or polypropylene is used, but in recent years, it has moisture permeability from the viewpoint of preventing stuffiness. Are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility. Specifically, the moisture permeability measured according to JIS Z0208 is 3000 to 12000 g / m ² · 24 hr, preferably 6000 to 12000 g / m ² · 24 hr, more preferably 8000 to 12000 g / m ² · 24 hr. It is desirable to use a liquid sheet.

  On the other hand, the gathered nonwoven fabric 16 forming the three-dimensional gathered BS is a nonwoven fabric made into a double sheet by folding, and the side edge of the absorbent body 13 that is wound by the liquid-permeable top sheet 11 is further wound from above. The absorber 13 extends to the back side and is bonded. More specifically, the gathered nonwoven fabric 16 has a three-dimensional gather BS forming portion left in the middle portion in the longitudinal direction of the paper diaper, and a range extending from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. Further, at the front and rear end portions in the longitudinal direction, the section from the intermediate portion in the width direction to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and the portion forming the three-dimensional gather BS is the absorber. While being folded at the upper surface portion of 13, it is bonded by a hot melt adhesive or the like.

  In the gathered nonwoven fabric 16 formed of the double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 17, 17... The thread-like elastic elastic members 17, 17... Are for forming a three-dimensional gather BS by raising a non-woven fabric portion protruding from the absorber side edge portion by elastic elastic force in a product state.

In the same manner as the liquid-permeable top sheet 11, the material fiber constituting the gathered nonwoven fabric 16 is not limited to synthetic fibers such as polyethylene or polypropylene, such as olefins, polyesters, and polyamides, but also regenerated fibers such as rayon and cupra, A natural fiber such as cotton can be used, and a nonwoven fabric obtained by an appropriate processing method such as a spunbond method, an SMS method, a thermal bond method, an air-through method, a point bond method, a melt blown method, or a needle punch method can be used. However, in order to prevent stuffiness, it is particularly preferable to use a non-woven fabric with a low basis weight and excellent air permeability. Specifically, the non-woven fabric processing method is suitable by the spunbond method or the SMS method in terms of excellent balance between thinness and strength, and the basis weight is preferably 8 to 30 g / m ² , and 10 to 22 g. / M ² is more preferable, and 10 to 15 g / m ² is particularly preferable. The thickness is preferably 0.5 mm or less, more preferably 0.3 mm or less, and particularly preferably 0.2 mm or less. Furthermore, with respect to the gathered nonwoven fabric 16, in order to prevent permeation of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.

  Moreover, although not shown in figure, the waterproof property may be improved by sandwiching a liquid-impermeable sheet similar to the back sheet 12 inside the gathered nonwoven fabric 16 formed of the double sheet nonwoven fabric.

  In addition, on the lower surface side (absorber side) of the liquid-permeable top sheet 11, in order to increase the absorption speed of body fluid and prevent the body fluid from returning, the liquid-permeable top sheet 11 is interposed between the liquid-permeable top sheet 11 and the encapsulating sheet 14. It is preferable to arrange a second sheet 18 made of a hydrophilic nonwoven fabric. The second sheet 18 may not be provided, but when disposed, the second sheet 18 is disposed between the liquid-permeable top sheet 11 and the encapsulating sheet 14. The second sheet 18 is preferably disposed so as to cover almost the entire area of the absorbent body 13 so as to improve the permeability of body fluids and prevent reversal.

  Furthermore, a bottom sheet 19 can be provided on the back side of the absorber 13. The bottom sheet 19 is provided in order to compensate for rigidity that is insufficient with the absorber 13 alone or to improve the touch of the outer surface of the product. Although it does not specifically limit as a raw material of the bottom sheet 19, A nonwoven fabric, crimped pulp, a low-absorbency cotton fiber (For example, a non-degreasing cotton fiber, a defatted cotton fiber, a rayon fiber is used as a water repellent or a hydrophobizing agent. Etc.), polyethylene fiber, polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber and the like. The bottom sheet 19 may be provided only under the absorber 13 or may be wound up and extended to the upper surface of the absorber 13 through the side surface of the absorber 13. It is also possible to use a plurality of bottom sheets 19 that are stacked.

  Next, the structure of the exterior sheet 20 will be described in detail. The exterior sheet 20 is a two-layer nonwoven fabric sheet in which the upper nonwoven fabric 20A and the lower nonwoven fabric 20B are bonded by a hot melt adhesive or the like, and various elastic elastic members are hot between the upper nonwoven fabric 20A and the lower nonwoven fabric 20B. It is bonded with a melt adhesive or the like to give stretchability. The planar shape forms a pseudo hourglass shape as a whole by the concave leg circumference cut lines 29 for forming leg openings on both sides of the middle.

The material fibers constituting the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B are not only the permeable topsheet 11 and the gathered nonwoven fabric 16, but also synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and polyamide, and rayon. Natural fibers such as spunbond, SMS, meltblown, thermal bond, air through, point bond, needle punch, etc. However, in order to make it easy to disperse the scent to the outside and to prevent stuffiness, it is preferable to use a nonwoven fabric excellent in air permeability by suppressing the basis weight. Specifically, the non-woven fabric processing method is suitable by the spunbond method or the SMS method in terms of excellent balance between thinness and strength, and the basis weight is preferably 8 to 30 g / m ² , and 10 to 22 g. / M ² is more preferable, and 10 to 15 g / m ² is particularly preferable. The thickness is preferably 0.5 mm or less, more preferably 0.3 mm or less, and particularly preferably 0.2 mm or less. Furthermore, it is preferable to use a nonwoven fabric that has been subjected to the same water repellent treatment as the gathered nonwoven fabric 16.

  In the exterior sheet 20, as the elastic elastic member, the waist elastic elastic members 24, 24... Disposed around the waist opening 23 and the front body F and the back body B are horizontally spaced with a vertical interval. A plurality of waist elastic elastic members 25, 25,... Are arranged along the direction to form shirring around the waist.

  The waist elastic elastic members 24, 24... Are arranged in the vicinity of the waist opening edge in the range of the side joint edge 21 where the front body F and the back body B are joined, with an interval in the vertical direction. A plurality of elastic rubber elastic elastic members for attaching a disposable diaper to the body by applying an elastic force to tighten around the waist of the body. As the waist elastic elastic member 24, thread rubber is used in the illustrated example. However, for example, a tape-like elastic member may be used.

  The waist elastic elastic members 25, 25... Extend from the upper position to the lower position excluding the waist opening edge 23 of the side joint edge 21, or from the side joint edge 21 to the crotch side as shown in the figure. It is a rubber elastic elastic member that is arranged along the horizontal direction at intervals in the vertical direction over the range, and applies a horizontal elastic force to the waist part of the front body F and the back body B, respectively. This is for forming the waistline shearing zones K1, K2. It should be noted that the boundary between the waist elastic elastic members 24, 24... And the waist elastic elastic members 25, 25. For example, even if the number of elastic elastic members arranged in the horizontal direction with an interval in the vertical direction between the front body F and the back body B cannot be specified, some of the upper elastic members 24 on the upper side are provided. As long as the remaining elastic elastic member functions as the waist elastic elastic member 25. In order to prevent the absorbent body 13 from contracting, the waist elastic members 25 are not continuous near the center where the absorbent main body is joined, and the elastic elastic members 25 crossing the absorbent main body 10 are cut. Further, the structure may be discontinuous and may not have elasticity provided by the waist elastic members 25.

  In addition, in the exterior sheet 20, the longitudinal direction (front-rear direction) intermediate portion of the crotch portion where the elastic elastic member is not disposed is not a two-layer structure as described above, but a one-layer structure that does not include the upper layer nonwoven fabric 20A or the lower layer nonwoven fabric 20B. Alternatively, it is preferable that the intermediate sheet in the longitudinal direction of the crotch does not have the exterior sheet 20 and the exterior sheet 20 is separated into a front body exterior sheet and a back body exterior sheet. As described above, it is preferable that the crotch part does not have an exterior sheet or has an area where the number of the exterior sheets overlap is small because the fragrance is easily diffused to the outside in this area. In addition, when it does not have the exterior sheet 20 in the longitudinal direction intermediate part of a crotch part, you may arrange | position the crotch exterior sheet | seat which consists of a nonwoven fabric etc. in the back surface side of an absorptive main body. The crotch lower exterior sheet may be made of the same nonwoven fabric as the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B, but is suitably composed of one (one layer) nonwoven fabric.

  The absorbent main body 10 and the exterior sheet 20 are integrated on the upper surface side of the exterior sheet 20 by bonding the absorbent main body 10 with an adhesive such as hot melt. And the absorptive main body 10 and the exterior sheet | seat 20 are folded up in the front-back direction, and the both sides are mutually joined by heat welding or a hot-melt-adhesive, etc., and it assembles into the underpants type disposable diaper 1.

[Water-soluble fragrance]
The water-soluble fragrance is configured so as to emit a scent only upon contact with a body fluid and hardly emit a scent before contact. Specifically, the fragrance component itself reacts with moisture to emit a scent, The fragrance component can be constituted by inclusion in a clathrate compound (clathrate), a fragrance component as a core material (encapsulation material) and a water-soluble component as a membrane material, or a microcapsule. The water-soluble fragrance is microencapsulated or powdered and supported on a predetermined member by a predetermined method.

  As said fragrance | flavor component, any of a natural fragrance | flavor and a synthetic | combination fragrance | flavor may be used, and you may use combining these. Specific examples of perfume ingredients include: Ryuzen Incense, Benzo Incense, Sea Spice Incense, Spirited Cat Incense, Clove Oil, Galvanam, Jasmine Absolute, Labanam, Mate Tea, Merilot, Mimosa, Musk Tonkin, Myrrh, Oak Moss or Moss de Chine, Milk Incense, Bikushi Incense , Oris, Bachuri, Rosemary Oil, Sandalwood Oil, Vetiver Oil, Violet Leaf Absolute, and other natural fragrances, higher alcohol, aldehyde, benzaldehyde, benzoic acid, cinnamic acid, cinnamic aldehyde, cinnamon alcohol, coumarin, ester, indole , Ketones, salicylic acid and related compounds, terpenoids, vanillin and other various synthetic fragrances, or a mixture of two or more thereof, but are not particularly limited thereto. Commercially available products can be widely used as the fragrance component. The fragrance component is preferably a highly volatile fragrance.

  Moreover, the said fragrance | flavor component can use the harmony fragrance | flavor which generate | occur | produces the fragrance | flavor which has a deodorizing effect in the fragrance | flavor itself, and which does not feel uncomfortable newly in harmony with the unpleasant odor of excrement.

  Examples of the fragrance component itself that reacts with moisture to emit a fragrance include water-soluble fragrances (essences) used in beverages obtained by dissolving and extracting a fragrance base with alcohol and water.

  As the inclusion compound, cyclodextrin, dextrin, indigestible dextrin, and the like can be used. In particular, when cyclodextrin is used, it not only emits a scent but also adsorbs odor components of excrement. It is preferable because it is effective. The cyclodextrin may be any one of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, or a mixture of two or more.

  A microencapsulated fragrance component has the property of causing a fragrance when the fragrance component of the core material flows out when it comes into contact with moisture in excreta such as urine and feces. The mechanism by which the fragrance component flows out is not particularly limited. For example, if the liquid material in the excrement is sucked, the membrane material will be broken, if the liquid content in the excrement is sucked, the pores formed in the membrane material will swell, and the liquid content in the excrement will be sucked And the form in which the membrane material dissolves. Moreover, it can change to the form by absorption of such a liquid component, and can also illustrate the form which the same phenomenon produces by the heat receiving by contact with excrement, pH change, etc.

  The film material may be water-soluble, and for example, gelatin, agar, natural gelling agent, glycerin and the like can be used. The structure of the capsule is not particularly limited, and for example, a simple mononuclear structure can be exemplified. Furthermore, the shape of the microcapsule is not particularly limited. However, it is preferable that the shape has no protrusion so as not to give the wearer a sense of foreign matter. The size of the microcapsule is not particularly limited. From the viewpoint of preventing the wearer from feeling foreign matter, the design can be made as appropriate. From the viewpoint of preventing foreign matter, it is usually 0.1 to 1000 μm, preferably 1 to 50 μm.

  The water-soluble fragrance | flavor which consists of the above-mentioned structure is apply | coated to the predetermined | prescribed area | region where the planar position on the disposable diaper 1 is at least one part of the outer peripheral part of the absorber 13, and the part corresponding to the bodily fluid discharge part of the absorber 13 And it is not applied to the periphery.

  The portion where the water-soluble fragrance is not applied is a portion including at least a portion corresponding to the body fluid discharge portion of the wearer, and preferably the urine absorbed in the absorber 13 by the first average amount of urination. The part including the diffused range.

  The range in which urine is diffused by urination includes the material of the liquid-permeable top sheet 11 and the absorbent body 13, the amount and blending ratio of the high absorbent material, the front-rear direction and the width of the absorbent body 13, as will be described in detail in the following examples. For example, the blending ratio of the cotton-like pulp and the superabsorbent polymer is a weight ratio of 1: 2, which varies depending on the arrangement position in the direction, and the amount of excretion per unit time and the posture of the wearer during excretion. In the case of a disposable diaper having a width of 140 mm and a length of 385 mm for a 14 kg child, the center of the average urination position of a girl using this size diaper is 30 mm wide from the front end of the absorber 13 In the case of the absorber 13 diffusing in a range of a radius of about 80 mm at the maximum from the urination position when the urination of about 35 cc, which is the first average urination volume, is located at the center in the direction, and before and after the absorber 13 Vs. direction , It is possible to set the range of 30mm~170mm from the front end and the region not soluble perfume is applied.

  In the example shown in FIG. 3, the water-soluble fragrance is applied to the application ranges 30 and 30 formed at both ends in the front-rear direction of the absorber 13, but only the both sides in the width direction of the absorber 13. They may be disposed respectively, or may be separately or continuously applied to both ends in the front-rear direction and both sides in the width direction. The application range 30 in FIG. 3 shows a planar range in which the water-soluble fragrance is applied.

Thus, by applying the water-soluble fragrance to the outer peripheral portion of the absorbent body 13 and not applying it to the portion corresponding to the body fluid discharge portion and its periphery, the portion corresponding to the body fluid discharge portion of the absorber 13 and the first time When urination or defecation that is absorbed and retained only in the surrounding area is not emitted, but when there is excretion after the second time or when there is a large amount of excretion even at the first time Then, since excrement such as urine and fecal liquid absorbed and held in the absorber 13 reaches the outer peripheral portion of the absorber 13 and approaches the absorption capacity of the absorber 13, a scent is emitted. Appropriate diaper changing time can be recognized. That is, as shown in FIG. 3, each time the number of urinations increases, the range of urine absorbed and retained by the absorber 13 (urination ranges H ₁ , H ₂ ...) Expands to the outer periphery, but the outer edge is water-soluble. When reaching the application range 30 of the natural fragrance, in the example shown in the figure, the scent is emitted for the first time at the time of urination.

  The application range 30 of the water-soluble fragrance is not particularly limited as long as it is a part other than the part corresponding to the body fluid discharge part of the absorbent body 13 and the periphery thereof, but if only the part close to the outer edge part of the absorbent body 13 is used, Since there is a possibility that leakage occurs due to an overcapacity at the same time as the generation occurs, a range of urine that spreads to the absorber 13 with each urination is obtained in advance, and urination is performed for the second and subsequent times, preferably about the second to fifth times. It is preferable to apply in such a range that the scent is emitted for the first time. For example, in the same way as described above, in a disposable diaper for a child having a width of 140 mm and a length of 385 mm and a weight guideline of 9 to 14 kg, the absorbent 13 is moved from the center in the front-rear direction to the front. The first urination of about 35cc (average urination volume for children using diapers of this size) at the urination position in the center of the width direction of 30mm (average urination position for girls using diapers of this size) In this case, the water-soluble perfume application range 30 is outside the position 60 mm from the front and rear end, preferably 50 mm from the front and rear end. It is preferable to form it outside the position, more preferably outside the position 30 mm from the end in the front-rear direction. As a result, the scent comes out only when the second and subsequent excretion occurs.

  When the width of the absorber is 150 mm or less, such as a disposable diaper for children, urine may diffuse in the entire width direction of the absorber in the first urination, so that the longitudinal direction of the absorber 13 as described above. It is desirable to provide an application range 30 of the water-soluble fragrance at the end, but when the width of the absorber exceeds 150 mm, such as a disposable diaper for adults, the water-soluble fragrance is applied to both ends in the width direction of the absorber 13. It is preferable to provide a coating range 30. Thereby, when an adult is using at night and there is a small amount of urine leakage before being absorbed by the absorber, such as when turning over, a scent is not generated, but the absorption by the absorber 13 is constant. If there is more urination than the amount, a scent is generated.

  The member (cross-sectional position) for applying the water-soluble fragrance is not particularly limited as long as it is a position that comes into contact with excrement, and can be mixed in the absorbent body 13, or the liquid-permeable top sheet 11 and the second part. Between the sheet 18, between the second sheet 18 and the encapsulating sheet 14, between the upper encapsulating sheet 14 and the absorber 13, between the bottom sheet 19 and the encapsulating sheet 14 on the lower layer side, and / or It is also possible to apply between the lower sheet 14 and the back sheet 12. In consideration of the burden on the skin of the wearer and the diffusibility of the scent, it is applied between the bottom sheet 19 and the lower-layer side encapsulation sheet 14 and / or between the lower-layer side encapsulation sheet 14 and the back sheet 12. It is preferable to do this.

  Applying the water-soluble fragrance to each member includes not only applying by ordinary brush, but also carrying it by a known spraying or spraying method such as spraying or roll transfer, etc., on the application surface of a hot melt adhesive or the like. On the other hand, it is also supported to disperse the microencapsulated or powdered water-soluble fragrance. That is, it means that the water-soluble fragrance is not carried on a separate member such as a sheet material, but is carried directly on the constituent member of the disposable paper diaper 1.

The planar shape of the application range 30 of the water-soluble fragrance may be a substantially rectangular shape as shown in FIG. 3, but the shape is set so that the peripheral side is wider than the center side of the absorbent body 13. It is preferable to do. Specifically, as shown in FIG. 4, three belt-like ranges 30 a, 30 b, and 30 c along the width direction are spaced from each other in the front-rear direction from the absorber center side at both ends in the front-rear direction of the absorber 13. The band-shaped range positioned on the center side of the absorber 13 is formed so that the length in the width direction and / or the length in the front-rear direction are gradually reduced in the band-shaped range located on the center side of the absorber 13 (on the side of 30a). . Thereby, as the urination range gradually expands from the central portion of the absorbent body 13 to the outside (H ₁ → H ₄ ), the arrangement range of the water-soluble fragrance to which this urine range is applied gradually expands. Therefore, a stronger scent is emitted step by step, and the scent becomes easier to notice as the liquid absorption capacity of the absorber 13 decreases.

  As shown in FIG. 5, the three belt-like areas 30a, 30b, and 30c are provided in a curved shape that protrudes outward in accordance with the outline of the urination area that expands in an approximately elliptical or circular shape from the center. You can also.

  On the other hand, as shown in FIG. 6, the planar shape of the application range 30 may be a triangular shape having both ends in the front-rear direction of the absorber 13 as the base and the center as the apex. Thereby, as the urination range gradually expands from the central portion of the absorber 13 to the outside, a stronger scent is emitted continuously. It is preferable that the apex of the triangle is positioned so as to cover the second urination range. In the illustrated example, a continuous triangular shape is used, but a discontinuous triangular shape divided into a plurality of regions spaced in the front-rear direction of the diaper may be used.

  Further, the application range 30 of the water-soluble fragrance may be a combination of discrete figures such as a circle, an ellipse, and a polygon as shown in FIG. In the illustrated example, three circular partition portions arranged at intervals in the diaper width direction are provided at both ends in the diaper front-rear direction, and are provided in three stages with intervals in the diaper front-rear direction. Are formed so that the diameters of the respective partition portions located at the steps closer to the center of the center gradually become smaller.

  The application range 30 of the water-soluble fragrance is partitioned into a plurality of partition portions from the center side to the peripheral side of the absorbent body 13, and water-soluble fragrances that emit different scents are disposed in each partition portion. Good. For example, as shown in FIGS. 4 and 5, when the band-like areas 30 a, 30 b, 30 c are discretely arranged at intervals in the front-rear direction of the diaper, each band-like area 30 a, 30 b, 30 c has a different scent A water-soluble fragrance that emits water can be disposed. 3 and 6, when the application range 30 is continuously provided in the diaper front-rear direction, although not shown, the application range 30 is partitioned into a plurality of diaper front-rear directions, and each partition is different. A water-soluble fragrance that emits a scent can be applied. In this case, it is preferable to partition so that about 2 to 5 sections are formed in the diaper front-rear direction. Thereby, it becomes possible to make it a standard of the diaper exchange time according to the kind of scent.

  Thus, the proof test was done about the effect at the time of dividing the application range 30 of the water-soluble fragrance into a plurality of diaper front and rear directions and applying the water-soluble fragrance that emits a different scent to each compartment. In the experiment, when the front end of the absorber is 0 and the rear end is 100, the first water-soluble fragrance A is applied in the range of 70 to 85, and the second water-soluble fragrance B is in the range of 85 to 100. Prepare the coated absorbent body 13 and have 5 subjects sniff about the disposable diaper in which a part of the water-soluble fragrance A has absorbed water and the disposable diaper in which both the water-soluble fragrances A and B have absorbed water, They asked if there was a difference in scent between the two. As a result, all five subjects answered that there was a difference in fragrance, and no one answered that the fragrance was the same.

  Here, when different types of water-soluble fragrance are applied to each partition, the water-soluble fragrance is applied to the partition on the center side of the absorber and the partition on the periphery side of the absorber (the outer side immediately It is preferable to use a fragrance that changes to another scent different from the scent of the fragrance itself applied to these compartments by mixing with those applied to the compartments). Specifically, as shown in FIG. 4, there is a scent emitted by urine coming into contact with the band-shaped area 30a and a fragrance produced by urine coming into contact with the band-shaped area 30b applied immediately outside the band-shaped area 30a. By mixing, a fragrance having a modulating action that emits a scent different from the fragrance applied to the band-like regions 30a and 30b is used. As a result, the problem that the scent of the next strip-shaped range 30b is erased by the scent of the strip-shaped range 30a and cannot be noticed can be solved, the scent can be reliably identified, and the diaper replacement time can be known appropriately. As a fragrance with such a modulation action, for example, a scent of a fruity flower and a fragrance of fresh berries and citrus are combined to feel a fruity floral scent. You can use things that change the way you feel the scent.

  By the way, although the diffusion range of the excrement absorbed by the absorbent body 13 is shown in an elliptical shape or a circular shape in the illustrated example, it is not certain depending on the wearer's posture, the fiber orientation direction of the absorbent body 13 or the like. . In order to adjust the mismatch of the diffusion range in the front-rear direction and the width direction in the absorber 13, as shown in FIG. 8, the absorber is disposed at both ends in the front-rear direction or both sides in the width direction as shown in FIG. The embossed recess 32 can be provided in a direction substantially orthogonal to the direction from the center side of 13 to the peripheral side. In the example shown in FIG. 8, three belt-shaped ranges 30a, 30b, and 30c having curved shapes that are substantially along the absorber width direction and convex toward the edge side (outside) in the absorber front-rear direction are provided at both ends in the front-rear direction. In the absorbent body 13 arranged with a space in the front-rear direction of the absorbent body 13, the belt-shaped areas 30 a, 30 b, and 30 c are along the side edge on the absorbent body center side, with a slight space from the side edge. A linear embossed recess 32 is provided. Accordingly, when the embossed recess 32 is not provided, as shown in FIG. 9 (A), assuming that the scent is generated by the second urination, the both sides of the absorbent body 13 are still in the width direction. Despite the remaining capacity to absorb, there is a risk that the water-soluble fragrance and urine over a wide area will come into contact with each other over a wide area and a strong scent will be generated and the diaper replacement time will be recognized early despite the remaining capacity remaining On the other hand, when the embossed recesses 32 are provided at both ends in the front-rear direction of the absorbent body 13, the urine absorbed by the absorbent body 13 in the embossed recessed section 32 as shown in FIG. Diffuses outward so as to wrap around the edge of the embossed recess 32, so that the diffusion of the absorber 13 in the front-rear direction is suppressed, and the absorber 13 is easily shifted to the diffusion in the width direction. Diffusion in the front-rear direction Diffuse and the integrity of the width direction, so that compatibility with suitable diaper changing timing and intensity of smell is secured.

  When the diffusion in the width direction of the absorber 13 is strong, the embossed recess 32 is applied with water-soluble fragrance provided at both ends in the front-rear direction even if the diffusion in the width direction of the absorber 13 and the front-rear direction is substantially equal. When there is a possibility of causing side leakage from both ends in the width direction of the absorbent body 13 before the diffusion region reaches the range 30, or when the application range 30 of the water-soluble fragrance is provided on both width direction sides of the absorbent body 13 For example, the absorber 13 can be provided on both sides in the width direction substantially along the front-rear direction of the absorber 13.

  As shown in the example of the drawing, the embossed recess 32 can be provided over a plurality of intervals with a gap on the peripheral side of the center of the absorbent body 13, or only one can be provided. In the case of providing a plurality, it is preferably about 2 to 5. Further, in the illustrated example, the embossed recess 32 is the same portion as the water-soluble fragrance application range 30 with respect to the absorber 13, that is, both ends in the front-rear direction of the absorber 13 provided with the water-soluble fragrance application range 30 in the illustrated example. However, depending on the state of excrement diffusion, the water-soluble fragrance application range 30 may not be formed, that is, in the illustrated example, on both sides in the width direction of the absorbent body 13. In addition, in the example of illustration, although the embossing recessed part 32 is formed of the continuous embossing line, it is good also as dotted line shape and chain line shape. In addition, substantially the same effect can be obtained by replacing the embossed recess 32 with a slit that penetrates the absorber 13 with a predetermined width in the thickness direction.

  The range in which one urination diffuses the absorber was measured under various conditions. In the experiment, three types of disposable diapers of different sizes and materials were prepared (see Tables 1 to 4 below), and artificial urine was discharged from a girl's urine outlet at a speed of 750 cc / min by attaching it to a dummy doll. After a minute, it was desorbed and the diffusion distance from the urination port position was measured. The position of the urination port was 25 mm in the diaper A, 30 mm in the diaper B, and 35 mm in the diaper C from the center in the front-rear direction of the absorber. The artificial urine (10,000 g) is prepared by mixing urea: 200 g, sodium chloride: 80 g, calcium chloride dihydrate: 3 g, magnesium sulfide heptahydrate: 8 g, and ion-exchanged water: 9,709 g. In addition, it is colored by adding an edible blue dye.

  The results of the experiment are shown in Table 4. Since the standard of the spreading | diffusion range with respect to one urination is known from Table 4, the application range 30 of a water-soluble fragrance | flavor can be provided outside this.

[Other examples]
(1) In the above embodiment, in addition to applying the water-soluble fragrance to each member, the spraying, spraying method and fixing method using an adhesive were exemplified, but as shown in FIG. 10, the water-soluble fragrance was supported in advance. The scent sheet 31 may be disposed between the members. In that case, in the manufacturing process, as shown in FIG. 10, the fragrance sheet 31 disposed across the cutting line L _D of the continuous absorbent member, together with the cutting of the absorber 13, so that the scent sheet 31 is cut Is preferable. This eliminates waste of materials and simplifies the manufacturing process.

(2) Although the disposable diaper has been described as an example in the above embodiment, the present invention can be widely used for absorbent articles such as a urine collection pad and an incontinence pad.

  DESCRIPTION OF SYMBOLS 1 ... Disposable diaper, 10 ... Absorbent main body, 11 ... Liquid-permeable top sheet, 12 ... Back sheet, 13 ... Absorber, 14 ... Encapsulated sheet, 18 ... Second sheet, 19 ... Bottom sheet, 20 ... Exterior sheet, 30 ... Application range, 31 ... Scent sheet, 32 ... Embossed recess

Claims (6)

Have at least the absorber, water-soluble fragrances microencapsulated or powdered emit fragrance by contact with body fluids, is applied to at least a portion of the outer peripheral portion of the absorbent body, corresponding to the body fluid discharge portions of the absorbent body Absorbent article that is not applied to the part to be and its periphery ,
The application range of the water-soluble fragrance is such that a plurality of strip-shaped ranges along the width direction are arranged at both ends in the front-rear direction of the absorber with a space in the front-rear direction from the absorber center side, and the absorber An absorbent article, characterized in that the band-shaped range located on the center side of is formed such that the length in the width direction and / or the length in the front-rear direction is gradually reduced . The absorbent article according to claim 1, wherein the water-soluble fragrance is also applied to both side portions of the absorbent body in the width direction. The absorbent article according to claim 1 , wherein water-soluble fragrances that emit different scents are applied to the respective band-shaped ranges . The water-soluble fragrance is configured to change to another scent by mixing the one applied to the band- shaped area on the center side of the absorber and the one applied to the band-shaped area on the periphery side of the absorber. The absorbent article according to claim 3 . Wherein on both sides of the longitudinal direction of both end portions or the width direction of the absorbent body, either the absorber center side substantially perpendicular claim embossed depressions along the direction are provided to 1 and the direction toward the peripheral side from 4 to Absorbent article according to crab. In the absorbent article, the absorbent body surrounded by the encapsulating sheet is interposed between the liquid-permeable top sheet and the back sheet, and the bottom sheet is interposed between the absorbent body and the encapsulating sheet. Configured
The absorbent article according to any one of claims 1 to 5 , wherein the water-soluble fragrance is applied between the bottom sheet and the encapsulating sheet and / or between the encapsulating sheet and the back sheet.

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