JP4130152B2 - Absorbent articles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent article that can effectively prevent the occurrence of eczema, rash, rash, and the like.
[0002]
[Prior art and problems to be solved by the invention]
It is known that a rash is likely to occur around the waist of a wearer wearing a disposable diaper. There are various theories about the cause of ash, but no clear mechanism is known at this time. However, it is thought that sweat is also a factor. In particular, since sweat generated from the back flows down to the waist, it becomes easier for the sweat to collect around the back waist. As a result, it has been known that heat is likely to occur around the back waist.
[0003]
Disposable diapers have been proposed for the purpose of preventing the occurrence of ashmo. For example, a disposable diaper has been proposed in which a flap located on the outer side from the side edge of the absorbent body is formed of a liquid-permeable sheet for the purpose of preventing stuffiness (see Patent Document 1). In addition, disposable diapers have been proposed in which the outermost back sheet of the diaper is composed of a sheet having hydrophilicity and breathability for the purpose of making it hygroscopic without being steamed, causing rashes, and making it uncomfortable. (See Patent Document 2).
[0004]
Furthermore, a disposable diaper has been proposed in which a breathable sweat-absorbing sheet is bonded to the inner surface of a diaper waist flap (see Patent Document 3). This disposable diaper has a sheet that absorbs sweat on the inner surface of the waist flap that is likely to cause eczema, rash, rash, etc., thereby absorbing sweat generated from around the waist of the wearer, It is intended to prevent the occurrence of. According to this diaper, sweat generated from the waist of the wearer is absorbed by the sweat absorbing sheet. However, since the sweat-absorbing sheet that has been wet by absorbing sweat is in contact with the skin of the wearer, the skin of the wearer is exposed to a wet state. Therefore, it is not possible to sufficiently prevent the occurrence of ash and the like. In addition, when the sweat generated from the wearer's back flows down to the waist, the waist flap becomes more wet because the sheet actively absorbs it.
[0005]
[Patent Document 1]
Japanese Patent No. 3009482 [Patent Document 2]
Japanese Patent No. 2894770 [Patent Document 3]
Japanese Patent Laid-Open No. 2000-189454 [0006]
Accordingly, an object of the present invention is to provide an absorbent article that can effectively prevent the occurrence of eczema, rash, rash and the like.
[0007]
[Means for Solving the Problems]
The present invention is an absorbent article having left and right side portions and front and rear end portions, and having an end flap extending from an end edge on the front and rear end portion side of an absorbent body, the skin facing surface of the end flap substantially In particular, the above object is achieved by providing an absorbent article that is water-repellent in the entire region and substantially hydrophilic in the entire region of the non-skin facing surface.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 shows a perspective view of a pants-type disposable diaper as an embodiment of the absorbent article of the present invention. FIG. 2 shows a partially broken exploded perspective view of a plan view in which the diaper shown in FIG. 1 is separated and developed by a side seal portion. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a cross-sectional view of the back end flap along the longitudinal direction of the diaper.
[0009]
As shown in FIG. 1, the diaper 1 is a pants type. As shown in FIGS. 2 and 3, the diaper 1 has an absorption having a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid-retaining absorbent 4 interposed between both sheets 2 and 3. Comprising an absorbent main body 10 and an exterior body 5 that is located on the outer side (non-skin contact surface side) of the absorbent main body 10 and is bonded and fixed to the abdomen of the wearer when worn. Both side edges of the abdominal side portion A arranged on the back side and both side edges of the back side portion B arranged on the back side are joined to each other by known joining means such as heat seal, high frequency seal, ultrasonic seal, etc. The part is formed. Thereby, as shown in FIG. 1, the diaper 1 is formed with a waist opening 7 and a pair of leg openings 8,8. A crotch part C is formed between the ventral part A and the back part B.
[0010]
As shown in FIG. 2, the absorbent main body 10 has a vertically long rectangular shape, and its longitudinal direction coincides with the longitudinal direction of the diaper 1 so as to extend from the ventral side A to the back side B of the diaper 1. It is joined to the width direction center part of the exterior body 5 by this joining means. The absorbent body 4 in the absorbent main body 10 has an hourglass shape in which the central portion in the longitudinal direction is constricted, and is sandwiched and fixed between the top sheet 2 and the back sheet 3.
[0011]
As shown in FIGS. 2 and 3, in the absorbent main body 10, a pair of first three-dimensional guards 6A, 6A and second three-dimensional guards 6B, 6B extending in the longitudinal direction are formed on the left and right sides. As shown in FIG. 4, the first three-dimensional guard 6 </ b> A has a free end 61 </ b> A on the inner side in the width direction of the absorbent main body 10 and a fixed end (rising base end) 62 on the outer side. An elastic member 63A is disposed in the vicinity of the free end 61A so as to be extendable and retractable along the free end 61A. On the other hand, the second three-dimensional guard 6 </ b> B has a fixed end 64 with the exterior material 5, and has a free end 61 </ b> B on the outer side in the width direction than the fixed end 64. In the vicinity of the free end 61B, an elastic member 63B is disposed so as to be stretchable along the free end 61B.
[0012]
The exterior body 5 is composed of two sheet materials. Specifically, as shown in FIG. 2, the exterior body 5 is composed of a laminate of an outer layer sheet 51 and an inner layer sheet 52. In FIG. 2, the outer layer sheet 51 is distinguished from the inner layer sheet 52 by adding a dot pattern to help understanding. The outer layer sheet 51 forms the outermost surface of the diaper 1. The inner layer sheet 52 is disposed adjacent to the outer layer sheet 51 on the inner surface side of the diaper 1. Both the outer layer sheet 51 and the inner layer sheet 52 are made of a water-repellent nonwoven fabric. The outer layer sheet 51 and the inner layer sheet 52 have the same contour at the side edges, but the shapes in the longitudinal direction are different. Specifically, as shown in FIG. 2, the outer layer sheet 51 has extending portions 51 </ b> A and 51 </ b> B extending in the front-rear direction from the front and rear end edges of the inner layer sheet 52. Each of the extending portions 51A and 51B is folded back toward the absorbent main body 10 so as to cover the front and rear ends of the absorbent main body 10 after the absorbent main body 10 is arranged and fixed on the inner layer sheet of the exterior body 5. (See FIG. 4). The end edges of the extended portions 51 </ b> A and 51 </ b> B that are folded back extend beyond the front and rear end edges of the absorber 4 and reach the absorber. Accordingly, end flaps E1 and E2 extending in the front-rear direction from the front and rear end edges of the absorber 4 are formed in the diaper 1 (see FIGS. 1 and 4). As is clear from FIG. 4, the end flaps E1 and E2 are composed of an inner layer sheet 52 and an outer layer sheet 51 that is folded back to be double. And the liquid-permeable top sheet 2 does not exist in the end flaps E1 and E2.
[0013]
As shown in FIGS. 1, 2, and 4, a plurality of elastic members 71 extending in the width direction of the diaper 1 are arranged in a stretched state at predetermined intervals on the end flaps E <b> 1 and E <b> 2. As a result, an annular waist gather that is substantially continuous over the entire circumference of the waist opening 7 is formed. In addition, a plurality of elastic members 81 are disposed in the leg openings 8 and 8 along the edge of the openings in an extended state. Aside from these elastic members, as shown in FIGS. 1 and 2, a plurality of pieces extending in the width direction of the diaper 1 are provided in the waist circumference D located between the waist opening 7 and the leg openings 8, 8. The elastic members 91 are arranged at a predetermined interval. The elastic member 91 is disposed and fixed in a stretched state so that elastic stretchability is expressed at least at a portion outward in the width direction from both side edges of the absorber 4, and at least at a portion where the absorber 4 exists. It is not disposed at the central portion in the width direction in a state where elastic stretchability is exhibited. Each of the elastic members 71, 81, 91 is sandwiched and fixed between the outer layer sheet 51 and the inner layer sheet 52 constituting the exterior body 5.
[0014]
As the material constituting each of the above members, those usually used in the technical field can be used without particular limitation. For example, as the top sheet 2, a hydrophilic and liquid-permeable nonwoven fabric or an apertured film can be used. As the back sheet 3, a liquid-impermeable film or the like can be used. This film preferably has moisture permeability. As the absorbent body 4, a mixed fiber of fluff pulp and superabsorbent polymer particles can be used. As each elastic member, a natural or synthetic elastomer material can be used. As the sheet constituting the three-dimensional guard, the outer layer sheet 51 and the inner layer sheet 52, a water-repellent nonwoven fabric is used as described above.
[0015]
Thus, in the present embodiment, as shown in FIG. 4, the substantially entire area of the skin facing surface Ea of the end flap E2 of the back side B is water-repellent and substantially the entire area of the skin non-facing surface Eb. Is hydrophilic. The skin facing surface Ea and the skin non-facing surface Eb are divided with the folded portion of the outer layer sheet 51 as a boundary. The skin facing surface Ea has a water repellency of preferably 1 g / cm ² or more, and more preferably 3 g / cm ² or more, and more preferably 3 g / cm ² or more. Expressed as 0 g / cm ² . The water pressure resistance is measured as follows.
[0016]
<Measurement method of water pressure resistance>
A sample sheet is sandwiched between two 35 mmφ cylindrical tubes connected vertically, and physiological saline is poured into the upper cylindrical tube at a rate of 8 g / min. The time is measured when the saline begins to break through the sample sheet and flow into the lower cylindrical tube. The amount of liquid is calculated from the flow rate of physiological saline and the time required to break through the sample sheet. A value obtained by dividing the calculated liquid amount by the cross-sectional area of the cylindrical rod is defined as a water pressure resistance.
[0017]
As shown in FIG. 4, the skin facing surface Ea and the skin non-facing surface Eb of the end flap E2 are both composed of an outer layer sheet 51 that is water repellent. And in order to make the skin opposing surface Ea water-repellent, the extension part 51B of the outer layer sheet 51 that is water-repellent may be used as it is. On the other hand, in order to make the skin non-facing surface Eb hydrophilic, it is easy to apply a hydrophilic agent such as a surfactant to the skin non-facing surface Eb after the diaper 1 is manufactured or during manufacturing. In addition, there is a method in which a hydrophilic sheet is separately attached to the outer layer sheet 51 constituting the skin non-facing surface Eb of the end flap E2. Also in this case, it is affixed on the outer layer sheet 51 after or during manufacture of the diaper. The hydrophilic sheet to be pasted may extend beyond the skin non-facing surface Eb and further beyond the waist opening (tip) to reach the region of the skin facing surface Ea. In this case, if a soft sheet material such as spunlace is used for the hydrophilic sheet, a merit that the end portion of the end flap E2 becomes soft can be given.
[0018]
In the end flap E2, the outermost outer layer sheet 51 and the inner layer sheet 52 facing the outermost sheet 51 are joined and fixed to each other by a curtain sprayed hot melt adhesive. Further, the inner layer sheet 52 and the extending portion 51B of the outer layer sheet 51 opposed to the inner layer sheet 52 are also bonded and fixed to each other by the same means. At this time, in the end flap E2, the sheets constituting the end flap E2 are continuously joined in the diaper width direction of the end flap E2 including the boundary portion between the end flap E2 and the edge of the absorber 4. Thereby, the end flap E2 acts as a liquid leakage prevention seal portion against the liquid absorbed by the absorbent body 4 from flowing out toward the front and rear ends of the diaper.
[0019]
Since the diaper 1 of the present embodiment has the above-described configuration, the following advantageous effects (1) to (3) are exhibited in the diaper 1.
(1) When sweat generated from the wearer's back flows to the waist while wearing the diaper 1, the sweat is preferentially given to the skin non-facing surface Eb side of the end flap E2 which is hydrophilic. Absorbed. Since the skin non-facing surface Eb is located outside the diaper and is exposed to the outside air, it is excellent in the transpiration of absorbed sweat. In other words, sweat is difficult to be absorbed on the skin facing surface Ea side, which is water repellent. As a result, the waist circumference of the wearer facing the skin facing surface Ea is kept in a dry state with low humidity, and it is difficult to cause rashes and the like. In the diaper described in Patent Document 3 described above, a hydrophilic sweat-absorbing sheet is disposed on the skin facing surface, and a top sheet is disposed adjacent to the hydrophilic sweat-absorbing sheet. Sweat is absorbed preferentially, and the sweat absorbed by the sweat absorbent sheet is easily held by the sweat absorbent sheet and the top sheet, which makes it difficult for sweat to evaporate and the waistline is in a high humidity state. .
[0020]
(2) The liquid absorbed in the absorbent body 4 oozes out of the absorbent body 4 due to the body pressure of the wearer and tries to move to the end flap E2. However, in the present embodiment, the end flap E2 is joined to the extended portion 51B of the outer layer sheet 51 and the inner layer sheet 52, which are both water-repellent, over the entire length in the diaper width direction, at least at the boundary with the end edge of the absorber 4. Thus, since the liquid leakage prevention seal portion for urine or the like that flows out toward the front and rear ends of the diaper is formed, the liquid transfer to the end flap E2 is prevented. That is, the end flap E2 is prevented from becoming wet. In the diaper described in Patent Document 3 described above, the liquid absorbed by the absorbent body oozes directly to the end flap and wets the end flap, so that the transpiration of the sweat absorbed by the sweat absorbent sheet is only inhibited. On the contrary, it wets the waist of the wearer, and promotes the occurrence of rashes and the like. Moreover, the anti-moisture effect which is the original purpose of a diaper is also insufficient.
[0021]
(3) Since the water repellent extending part 51B which is one of the sheet materials constituting the end flap E2 extends beyond the edge of the absorbent body 4 and reaches the absorbent body, the body pressure of the wearer This prevents the liquid that has oozed out of the absorbent body 4 from passing through the top sheet 2 and transferring to the end flap E2. That is, the end flap E2 is prevented from becoming wet as in the case (2). In the diaper described in Patent Document 3 described above, the liquid absorbed by the absorbent body passes through the top sheet and oozes out to the end flap and wets the end flap, thereby inhibiting the evaporation of sweat absorbed by the sweat absorbing sheet. Not only is it done, it also wets the waist of the wearer and promotes the occurrence of rashes.
[0022]
As the water-repellent outer layer sheet 51, various nonwoven fabrics made of various thermoplastic resin fibers can be used. For example, an air-through nonwoven fabric made of a core-sheath type composite fiber, a spunbond nonwoven fabric, a heat embossed nonwoven fabric, a composite nonwoven fabric of spunbond and meltblown, and the like can be mentioned. As a surfactant used for making the non-skin facing surface Eb of the end flap E2 hydrophilic, a general surfactant, an anionic type, a cationic type, an amphoteric type and a nonionic type, are used. Agents. Specifically, fatty acid, fatty acid metal salt, polyoxyalkyl sulfate metal salt, alkyl sulfate metal salt, polyoxyethylene alkyl phosphate metal salt, alkyl phosphate metal salt, fatty acid diethanolamide, fatty acid sorbitan ester, alkyl glucoside , Polyglycerin fatty acid ester, alkyl succinic acid metal salt, alkyl polyoxyethylene ether, alkyl dimethyl glycine, dimethyl alkyl amine oxide and the like.
[0023]
The sheet constituting the skin facing surface Ea may contain an oily skin care agent. The oily skin care agent is transferred to the skin of the wearer immediately after the diaper 1 is worn, and protects the skin from physical damage such as rubbing between the wearer's skin and the diaper 1. And since a wearer's skin itself is provided with water repellency, it encourages that the sweat which flowed down from the back transfers to the skin non-facing surface Eb of a diaper outer side. Specific examples of oily skin care agents include liquid paraffin, silicone oil, animal and vegetable oils (olive oil, jojoba oil, safflower oil, squalane and squalene, etc.), monoglyceride, diglyceride and the like.
[0024]
The present invention is not limited to the embodiment. For example, in the above-described embodiment, the skin facing surface Ea and the skin non-facing surface Eb of the end flap E2 are made of the same sheet material, that is, the outer layer sheet 51. Further, a hydrophilic sheet material different from the sheet material may be used for the non-skin facing surface Eb. Further, as described above, a separate hydrophilic sheet material may be attached to the skin non-facing surface Eb side of the outer layer sheet 51 of the present embodiment. This hydrophilic sheet material is composed of, for example, non-woven fabric composed of hydrophilic fibers (for example, rayon, cotton, pulp), etc., as well as fibers obtained by variously treating fibers originally composed of a hydrophobic thermoplastic resin. Nonwoven fabric sheets and the like, and nonwoven fabric sheets obtained by various hydrophilic treatments of nonwoven fabrics made of hydrophobic fibers.
[0025]
In the above embodiment, the skin facing surface Ea and the non-skin facing surface Eb of the back end flap E2 are made water-repellent and hydrophilic, respectively, but instead of or together with this, the ventral end flap E1 The skin facing surface and the non-skin facing surface may be made water repellent and hydrophilic, respectively.
[0026]
In the above embodiment, the entire skin facing surface Ea of the end flap E2 is water-repellent and the entire skin non-facing surface Eb is hydrophilic. A portion, for example, a region near the edge of the end flap E2 on the skin facing surface Ea may be made hydrophilic.
[0027]
Furthermore, in the said embodiment, although demonstrated taking the example of the pants-type disposable diaper as one embodiment of the absorbent article of this invention, this invention is an absorbent article other than this, for example, a deployment-type disposable diaper and a shorts type The same can be applied to sanitary napkins and the like.
[0028]
【The invention's effect】
According to the absorbent article of the present invention, it is possible to effectively prevent the occurrence of eczema, rash, rash and the like. In particular, it is possible to prevent the occurrence of a rash etc. that can easily occur around the waist of the wearer.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a pants-type disposable diaper as an embodiment of the absorbent article of the present invention.
2 is a partially broken exploded perspective view of a plan view of the diaper shown in FIG. 1 separated from a side seal portion and unfolded and viewed from the top sheet side.
3 is a cross-sectional view taken along line III-III in FIG.
4 is a cross-sectional view of the diaper shown in FIG. 1 along the longitudinal direction of the back end flap of the diaper. FIG.
[Explanation of symbols]
1 Pants-type disposable diaper (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 5 Exterior body 51 Outer sheet 52 Inner sheet 10 Absorbent body E1, E2 End flap Ea Skin facing surface Eb Skin non-facing surface

Claims (4)

An absorbent article having a left-right part and front and rear end parts, and having an end flap extending from an edge on the front and rear end part side of the absorbent body, wherein the substantially entire area of the skin facing surface of the end flap substantially the entire hydrophilic der skin non-facing surface with a water repellent is,
The end flap has a liquid leakage prevention seal portion formed by joining sheets constituting the end flap across the width direction of the absorbent article at least at the boundary with the edge of the absorbent body. and that the absorbent article. Wherein the end flaps are intake Osamusei article of claim 1, wherein the liquid-permeable top sheet does not exist. The absorbent article of claim 1 or 2, wherein at least one water-repellent sheet constituting said end flap has reached its extended out the absorber on beyond an edge of the absorbent body. The absorbent article of claim 1 Symbol mounting said end flap is an end flap of the back side.

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