JP2009142505A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article capable of excellently absorbing and holding an excretory substance such as feces, suppressing the attachment of the feces to the skin of a wearer by returning after absorbing once the semisolid feces such as soft feces, and also preferably coping with mass production with a simple structure. <P>SOLUTION: The absorbent article 10 includes: a liquid-permeable top sheet 1; and an absorbent body 3 with a water contraction fiber layer 13. Both ends of respective water contraction fibers 14 in the water contraction fiber layer 13 are not fixed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an absorbent article, and more particularly to an absorbent article for absorbing excrement such as loose stool.

  Absorbent articles used for absorbing and holding urine, feces, menstrual blood and the like excreted from the body are required to absorb and hold the above excrement so as not to leak. As an attempt to improve the above-described absorption retention for excrement, for example, in Patent Document 1, an inflatable part sealed with a gas generated by reacting bicarbonate or the like with an acid or the like is inflated, and the expansion is performed. Disclosed is a disposable absorbent article capable of expanding the layer spacing of a two-layer topsheet. However, the conventional absorbent article disclosed here has a complicated structure and is difficult to make, and it is difficult to sufficiently cope with efficient mass production.

JP-T-08-511703

  The present invention has high absorption retention of feces and other excrement, and in particular, once semi-solid excrement such as soft stool is absorbed, it can be prevented from reversing and adhering to the wearer's skin. And it aims at provision of the absorbent article which can respond suitably also to mass production with a simple structure.

  An object of the present invention is to provide a liquid permeable top sheet and an absorbent body having a layer of water-shrinkable fibers, in which both ends of each water-shrinkable fiber in the water-shrinkable fiber layer are not fixed. Solved by sex goods.

  The absorbent article of the present invention has high absorption retention of excrement such as feces, and in particular, once semi-solid excrement such as soft stool is absorbed, it is prevented from reversing and adhering to the wearer's skin. Moreover, it can cope with mass production with a simple structure. Moreover, since the absorbent article of this invention suppressed adhesion of loose stool etc. as mentioned above, there exists an effect that the skin of infants etc. can be kept clean, maintaining a smooth wearing feeling.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view schematically showing a tape-type diaper as an embodiment of the absorbent article of the present invention. In FIG. 1, the fastening tape 5 is peeled off from a fixing part (not shown) from the state when the diaper of Embodiment 1 is worn, and is shown in a state where the inside of the diaper can be seen by developing a little. The diaper 10 of Embodiment 1 has a back sheet 2 disposed on the non-skin contact surface side and a top sheet 1 disposed on the skin contact surface side, and further between the back sheet 2 and the top sheet 1. It has the absorber 3 interposed in. Here, the back sheet 2 has a two-layer structure of an upper layer 2a and a lower layer 2b (see FIG. 2), and has a shape in which both side edges together with the top sheet 1 are confined to the inner side (midline i side) in the longitudinal center portion c. ing. The diaper is gently folded inside the diaper at the center part c and is placed along the crotch, and the abdomen is covered with the front body part f, and the waist part is covered with the back body part r. And it is integrated by sticking the fastening tape 5 to the fixing | fixed part in the front body part f, and it wears stably.

  When the diaper 10 of this embodiment is worn as described above, the front body side edge 6a and the back body side edge 6b form an edge 6 that is continuous. The edge 6 constitutes a waist opening and surrounds the circumference of the wearer's waist, and is the highest place in the diaper when the wearer is standing. An elastic sheet 4 is disposed in the vicinity of the waist opening (in the illustrated case, the top sheet 1 on the rear body side r of the diaper is cut away, and only the elastic sheet 4 on the rear body side is shown. An elastic sheet is also arranged on the front body side f.) When worn, it shows an appropriate contraction force, fits around the waist of the wearer, and maintains a stable wearing position without slipping. Moreover, in the diaper of this embodiment, the upper layer 2a and the lower layer of the back sheet 2 are disposed on both outer sides of the absorbent body 3 along the edge 7 of the leg opening (the edge of the constricted portion formed by the back sheet 2). A long elastic member 8 interposed between 2b is disposed. Thereby, when worn as described above, the base portion of the wearer's leg is moderately tightened while forming a gather at the edge 7 of the leg opening, maintaining a stable wearing state, and excretory fluid, etc. Also effective for side leakage.

  FIG. 2 is an enlarged cross-sectional view showing a cross section taken along line II-II in which the diaper 10 in FIG. 1 is extended and straightened (in the cross-sectional views of FIGS. It is a dimension for clarity, and the ratio of the dimension of each member in the present invention is not construed as being limited thereby.) As shown in the figure, in the first embodiment, the diaper 10 includes a top sheet 1, a back sheet 2, and an absorbent body 3, and the absorbent body 3 includes an absorbent layer 12 and a layer 13 of water-shrinkable fibers. . More specifically, in this embodiment, the water-shrinkable fiber layer 13 is disposed on the non-skin contact surface side of the top sheet 1 and is interposed between the top sheet 1 and the absorbent layer 12. And the top sheet 1 and the back sheet 2 are joined by the hot melt 9 in the side peripheral edge part s extended to the outer side of the absorber 3, so that the absorber 3 does not move. The joining of the top sheet 1 and the back sheet 2 so that the absorbent body 3 does not move in the diaper 10 in this manner is the same at the front and rear peripheral end portions that extend to the front and rear outer sides of the absorbent body 3. The joining of the top sheet 1 and the back sheet 2 is not limited to hot melt, and may be made by other joining means. Furthermore, the water-shrinkable fiber layer 13 may be sandwiched between the top sheet 1 and the absorbent layer 12 so that the water-shrinkable fibers 14 in the absorbent body 3 do not move and become unevenly distributed. In addition, the absorption layer 12 can be comprised with a pulp fiber, an absorptive polymer, etc., and it is preferable to set it as the structure which wrapped these with tissue paper, a nonwoven fabric, etc.

  The top sheet 1 is preferably a mesh-like sheet having a mesh-like (mesh-like) opening, and the opening diameter (equivalent circle diameter of the opening) passes through the stool or the like while being divided depending on the case. For example, the size is preferably 50 μm or more, and more preferably 500 μm or more. In addition, from the viewpoint of fecal passage, the sheet opening area ratio (percentage of the value obtained by dividing “the total area of the opening portions in the predetermined area” by “the area of the predetermined area”) is 20% or more, It is preferable that it is 50% or more. Further, the opening diameter of the opening portion is preferably set to, for example, 50% or less of the fiber length of the water-shrinkable fibers 14 so that fibers such as the water-shrinkable fibers 14 arranged below the top sheet 1 do not come out. . As the mesh sheet used for the top sheet 1, in addition to the apertured film and apertured nonwoven fabric usually used for this type of article, fibers are knitted, the fibers are directly extruded, or the intersections of the fibers are heated. A reticulated sheet produced by fusing can be used.

  In the first embodiment, the water-shrinkable fiber layer 13 is provided with a large number of water-shrinkable fibers 14, and both ends of each water-shrinkable fiber are not fixed and are in a web state. Here, “both ends of the fiber are not fixed” means that the fiber can be contracted without being restrained by other members when it absorbs moisture and contracts. It means that the contraction is not hindered by being bonded to another member (for example, a sheet-like member). Since both ends of the water-shrinkable fiber 14 are not fixed in this manner, when soft stool enters the water-shrinkable fiber layer 13, the water-shrinkable fiber shrinks without being constrained by moisture contained in the stool. The movement of the fiber that shrinks without being constrained at both ends provides a unique action that cannot be obtained if the end of the fiber is constrained, and the fiber wraps or surrounds the irregular soft stool. It can be captured effectively by embedding it inside. At this time, the water-shrinkable fiber may shrink while winding. As described above, the water-shrinkable fiber layer is preferably in the form of a cotton in which fibers are entangled in a web shape, and such a web state is, for example, stacked by a normal method and entangled by air or water flow. Obtained by the method.

  The water-shrinkable fibers 14 are fibers that shrink under conditions where water is present from room temperature to the body temperature of the wearer (about 10 to 40 ° C.). Specific examples include fibers made of PVA (polyvinyl alcohol). The shape of the water-shrinkable fiber 14 is not particularly limited, but the fiber length is preferably about 1 to 50 mm, and more preferably about 1 to 20 mm. By setting it as such length, the capture | acquisition effect | actions of the soft stool etc. which were mentioned above can be exhibited effectively. The shrinkage rate of the water-shrinkable fiber 14 (([length before shrinkage] − [length after shrinkage] / [length before shrinkage]) is not particularly limited, but is in the range of about 10 to 70%. The fiber diameter of the water-shrinkable fiber is preferably 5 to 50 μm, and specific examples of the water-shrinkable fiber 14 include Claron K-II (trade name, polyvinyl alcohol fiber, manufactured by Kuraray Co., Ltd.). Although the amount contained in the layer 13 of the water-shrinkable fiber 14 is not particularly limited, it is preferably contained at 50% or more based on the total mass with other fibers.

  Further, the processing function such as soft stool in the diaper 10 of the present embodiment will be described in detail. In the region for receiving the excrement of the diaper of the first embodiment, there is a top sheet 1 when viewed from the wearer side, and a layer 13 of water-shrinkable fibers is disposed on the non-skin contact surface side. Therefore, when the excreted loose stool passes through the opening portion of the top sheet 1, it moves to the layer 13 of the water-shrinkable fiber.

  Here, loose stool or the like is usually a semi-solid, high-viscosity excrement containing moisture, so that it is difficult to be absorbed inside the absorbent body and easily remains outside. Therefore, when it is pressed by the wearer's movement or the like, it may reverse and reattach to the skin.

  On the other hand, in the diaper 10 of the present embodiment, the loose stool or the like stays in the water-shrinkable fiber layer 13 on the upper side of the absorbent layer 12 so that the water of the stool oozes and the water-shrinkable fibers 14 in the vicinity thereof contract. As described above, the dynamic action due to the contraction of the fiber occurs, and loose stool or the like is captured. The loose stool or the like captured in this manner is unlikely to return, and reattachment to the wearer's skin is effectively suppressed / prevented. Furthermore, excess moisture such as loose stool gradually moves to the lower absorption layer 12, and the loose stool becomes dry. As a result, loose stool or the like is kept in a dry state while wearing a diaper, and is more difficult to reverse, and even when worn for a long time, the wearer's skin is kept smooth and clean.

  In particular, soft stool of infants such as baby food has a low water content and increased viscosity, and it is difficult for the infants to move quickly to the absorbent body, which also causes rough skin of the infants. In such a case, the diaper 10 of the present embodiment particularly exhibits a high effect, protects the skin of an infant from a rash, etc., and can maintain a smooth and clean state. Moreover, since the reattachment to the skin such as loose stool is suppressed, the situation that it is difficult to wipe loose stool stuck to the buttocks is greatly improved, and simple and quick diaper replacement is possible. In the first embodiment, the action of capturing loose stool or the like in the diaper has been described as an example.According to the present invention, even in the case of a panty liner or napkin other than a diaper, the same excellent effect is obtained. For example, it exhibits a high effect on the treatment of descending products and menstrual blood with high viscosity.

  Further, regarding the influence of urine excretion in the diaper 10 of the first embodiment, since urine has low viscosity, the top sheet 1 and the layer 13 of water-shrinkable fibers are quickly transmitted through, and the absorbent layer 12 therebelow. Absorbed and retained. Therefore, even when the water-shrinkable fiber layer 13 receives excretion of urine, the time during which the urine remains in the same region is short and the shrinkage of the water-shrinkable fiber 14 hardly proceeds. For example, even when urine is excreted in an amount normally discharged by an infant, the absorbent layer 12 absorbs and retains urine, while the water-shrinkable fiber 14 does not contract until the stool or the like is excreted, and the water-shrinkable fiber layer 13 Does not lose the function. And when the said loose stool etc. are excreted, the water contraction fiber 14 fully shrink | contracts and exhibits the favorable soft stool processing effect | action mentioned above. In addition, the areas of normal urination and defecation may be different, and a selective processing function for urine and loose stool is realized.

In the first embodiment, the size of the water-shrinkable fiber layer 13 is not particularly limited. However, it is preferable that the water-shrinkable fiber is disposed in the same width as the absorbent layer 12 so that the water-shrinkable fiber is not biased. The thickness t of the water-shrinkable fiber layer 13 is preferably set to 1 to 10 mm in consideration of a good collecting action such as loose stool. Moreover, it is preferable that the basic weight of the fiber of the layer of a water contraction fiber is 5-400 g / m < ² >.

  The water-shrinkable fiber layer 13 preferably contains deodorant fibers such as activated carbon fibers. Thereby, deodorant fiber exists near odor generating products, such as loose stool, and a high deodorizing effect can be exhibited. Further, the deodorant fiber is preferably coexisting with the water-shrinkable fiber 14 as a fiber whose both ends are not fixed. By doing so, the dynamic action due to the shrinkage of the water-shrinkable fiber 14 described above is not hindered, An effective deodorizing action can be exhibited. Other non-shrinkable fibers may coexist in the water-shrinkable fiber layer 13, and at this time, it is preferable that both ends of the non-shrinkable fibers are not fixed. Furthermore, members other than fibers may coexist in the water-shrinkable fiber layer 13. The mass of deodorant fibers, activated carbon fibers, deodorant-attached fibers, etc., other than the fibers coexisting with the water-shrinkable fibers 14 is not particularly limited, and the deodorizing action is effectively performed in relation to the action of the water-shrinkable fibers 14. It is preferable to use in the range where it is exhibited.

  In the diaper of Embodiment 1, the absorbent layer 12 is not particularly limited as long as it has a function of absorbing the liquid normally used in this type of article. For example, a superabsorbent polymer such as a superabsorbent polymer or the like. What consists of a water absorbing fiber, a pulp, etc. can be used. The back sheet 2 is not particularly limited, and those usually used for this type of article can be used. For example, a thermoplastic film to which a nonwoven fabric is bonded can be used. This film may have moisture permeability or may be moisture impermeable. The upper layer 2a and the lower layer 2b of the back sheet are preferably bonded over the entire surface, and can be bonded by, for example, a spiral hot melt adhesive. Although it does not specifically limit as the elastic member 8, What is normally used for this kind of articles | goods can be used, for example, synthetic rubber, such as styrene-butadiene, butadiene, isoprene, neoprene, natural rubber, EVA, stretchable polyolefin, polyurethane Etc. As the shape of the elastic member, a thread-like or string-like (flat rubber etc.) section having a rectangular, square, circular, or polygonal cross section, or a multifilament type thread-like shape can be used. The elastic sheet 4 is not particularly limited as long as it is normally used for this type of article, and a sheet having the elastic member as described above can be used. The diaper of this embodiment can be manufactured by the method normally employ | adopted for the assembly of this kind of articles | goods, combining each member mentioned above with another member if needed.

  In the first embodiment, another functional member or a functional structure may be provided in order to promote the above-described soft stool processing action, or to maintain this action and provide other functions. For example, a sheet material or the like may be disposed between the top sheet 1 and the water absorbent fiber layer 13 and / or between the water absorbent fiber layer 13 and the absorbent layer 12. Moreover, you may comprise the absorber 3 only with the layer 13 of a water absorption fiber, without using the absorption layer 12. FIG. In that case, in order to increase the amount of liquid absorption, an absorbent polymer may be mixed in the layer 13 of water-absorbing fibers.

  FIG. 3 is a perspective view schematically showing a tape-type diaper 20 as another embodiment (embodiment 2) of the absorbent article of the present invention. FIG. 4 is an enlarged sectional view showing a section taken along line IV-IV in which the diaper 20 in FIG. In the diaper 20 of the second embodiment, the absorber 3 is provided with a storage portion 15. The storage portion 15 is disposed in a part of the region formed by the edge 12a of the absorbent body 3 (here, the region formed by the edge of the absorbent body is defined by the edge of the absorbent body 3 when the absorbent article is viewed in the thickness direction). An enclosed range, for example, a portion formed through a part of the absorbent body 3 is a portion provided outside the skin contact surface or non-skin contact surface of the absorber 3. Specifically, it is formed so as to pierce the absorption layer 12 in the region where the wearer's defecation is present on the rear body side r. In the second embodiment, a large number of water-shrinkable fibers 14 are arranged in the storage portion 15 in a state of being entangled in a web shape with both ends of each water-shrinkable fiber being unfixed to form a water-shrinkable fiber layer 13. Has been. And the top sheet 1 is distribute | arranged so that the skin contact surface of the absorber 3 which has this layer 13 of water shrinkable fiber may be covered. In the diaper 20 of the second embodiment, the top sheet 1 is joined to the back sheet 2 at the peripheral end. Moreover, it is preferable to use a mesh-like sheet having an opening as the top sheet 1, and this mesh-like sheet has an opening that allows water stool to pass through effectively without allowing the water-shrinkable fibers to escape. preferable.

  In this Embodiment 2, since the accommodating part 15 is provided and the water shrinkable fiber 14 is accommodated here, it can distinguish from the function of another area | region, and can collect loose stool etc. effectively. That is, in the second embodiment, the action of the water-shrinkable fiber layer 13 for collecting loose stool or the like is the same as that of the first embodiment described above. It is not directly received. More specifically, since urination is performed in the diaper from the center c of the wearer to the front body side f, the absorber 3 absorbs and holds urine at this portion. On the other hand, since defecation is performed in the region on the rear body side r where the storage unit 15 is provided, the water-shrinkable fiber 14 does not contract even when urination is on the front body side f. And only after excretion of loose stool, etc., it reacts with this and contracts to exert its collecting function. As described above, in the second embodiment, the absorbent body 3 is divided into roles in a region, and particularly, when a large amount of urination is present or when worn for a long time such as at bedtime, a processing function such as loose stool is effectively performed. Demonstrate.

  In the first embodiment, the layer 13 of water-shrinkable fibers is housed and disposed in the housing portion 15, but this housing mode is not particularly limited, and the water-shrinkable fibers are not biased in the absorbent body. It is preferable to arrange the water-shrinkable fibers without any gaps throughout. The preferred range of the thickness t of the water-shrinkable fiber layer 13 is the same as in the first embodiment. In the present invention, the shape of the layer of the water-shrinkable fiber is not particularly limited, and may be a flat shape such as those of Embodiments 1 and 2, or other shapes that do not spread much in the surface direction of the absorbent article. May be.

  The absorbent article of the present invention is not particularly limited as long as it absorbs and holds liquid excreted or leached from the wearer's body, and may be an article used in contact with or close to the wearer's skin. Specifically, it is preferably used as a disposable diaper, sanitary napkin, panty liner, incontinence pad or the like.

FIG. 1 is a perspective view schematically showing a tape-type diaper as an embodiment of the absorbent article of the present invention. FIG. 2 is an enlarged cross-sectional view showing a cross section taken along line II-II in which the diaper in FIG. FIG. 3 is a perspective view schematically showing a tape-type diaper as another embodiment of the absorbent article of the present invention. FIG. 4 is an enlarged cross-sectional view showing a cross section taken along line IV-IV in which the diaper in FIG. 3 is elongated and linearized.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Top sheet 2 Back sheet 3 Absorber 5 Fastening tape 6 Edge 7 which forms waist opening Edge 8 which forms leg opening 8 Elastic member 9 Hot melt adhesive layers 10 and 20 Absorbent article (tape type diaper) 12 Absorption Layer 13 Water shrinkable fiber layer 14 Water shrinkable fiber 15 Storage

Claims (5)

  An absorbent article comprising a liquid-permeable top sheet and an absorbent body having a layer of water-shrinkable fibers, wherein both ends of each water-shrinkable fiber in the water-shrinkable fiber layer are not fixed.   The absorbent article according to claim 1, wherein the top sheet is a mesh sheet.   The absorptive article according to claim 1 or 2 in which said water contraction fiber layer has deodorant fiber.   The absorbent article according to any one of claims 1 to 3, wherein the water-shrinkable fiber layer is disposed on the skin contact surface side of the absorber.   The absorptive article according to any one of claims 1 to 4 in which said water contraction fiber layer is arranged in a part in the field which the edge of said absorber makes.

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