JP3725008B2 - Absorbent articles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent article such as a sanitary napkin or an incontinence pad, and more particularly to an absorbent article having high fit and preventing liquid leakage.
[0002]
[Prior art and problems to be solved by the invention]
Japanese Patent Laid-Open No. 1-68503 describes a disposable diaper in which a T-shaped leak-proof wall having a projecting portion projecting inward and outward is provided outward from the side edge of the absorber. Yes. This disposable diaper attempts to prevent leakage of excrement by bringing the upper surface of a T-shaped leak-proof wall into contact with the thigh of the wearer.
[0003]
However, since the tip portion of the inward projecting portion of the T-shaped leak-proof wall is located outward from the side edge of the absorber, the leak-proof wall is not exposed to high mounting pressure. In the case of being crushed, there is no longer any member that absorbs liquid at a position outward from the side edge of the absorber, and liquid leakage in the lateral direction is likely to occur.
[0004]
Therefore, an object of the present invention is to provide an absorbent article having high fit and preventing liquid leakage.
Another object of the present invention is to provide an absorbent article in which liquid leakage is prevented even when the leak-proof wall is crushed by the mounting pressure.
[0005]
[Means for Solving the Problems]
The present invention relates to a liquid-permeable surface layer, a liquid-impermeable back layer, a liquid-retaining absorbent layer interposed between both layers, and a leak-proof wall that stands up from the vicinity of each of the left and right side edges of the absorbent layer In an absorbent article in which a leak-proof groove having a predetermined shape is formed on the surface layer side of the absorbent layer,
The leak-proof wall has a base wall part, and an inwardly extending part and an outwardly extending part that protrude from the upper part of the base wall part to the inside and the outside of the absorbent article, respectively.
An elastic member is disposed along the length direction at the tip of each of the inwardly extending part and the outwardly extending part, and the inwardly extending part is above the absorbent layer and The object is achieved by providing an absorbent article positioned outward from the leakage preventing groove.
[0006]
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 plan view of a sanitary napkin as an embodiment of the absorbent article of the present invention as seen from the top sheet side, and FIG. 2 shows a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a sectional perspective view taken along line II-II in FIG.
[0007]
As shown in FIGS. 1 to 3, the sanitary napkin 1 of the present embodiment has a vertically long shape, a top sheet 2 as a liquid-permeable surface layer, and a back as a liquid-impermeable back layer. The sheet 3 and the absorbent body 4 as a liquid retaining absorbent layer interposed between the top sheet 2 and the back sheet 3 are provided. A pair of leak-proof walls 5 and 5 are arranged on the left and right sides of the napkin 1 along the length direction thereof. The leak-proof wall 5 stands from the vicinity of the left and right side edges of the absorber 4.
[0008]
The napkin 1 includes an excretion part facing part A that is a part facing the excretion part of the wearer when worn, and a front part B and a rear part that are adjacent to the excretion part facing part A and located in front and rear of the napkin 1, respectively. It is divided into part C.
[0009]
The top sheet 2 covers the entire area of the upper surface of the absorbent body 4 and extends from the side edge of the absorbent body 4 and is wound on the back sheet side. The top sheet 2 can be made of the same material as a conventionally known one, and for example, a hydrophilic nonwoven fabric or an apertured film is used. The back sheet 3 is composed of a laminate of a liquid impermeable film sheet (preferably a water vapor permeable and liquid impermeable film sheet) 3a and a liquid absorbent non-woven fabric 3b. The film sheet 3a is disposed so as to face the clothing when the napkin is worn, and the nonwoven fabric 3b is disposed so as to face the wearer. The absorbent body 4 is constituted by a mixture of fluff pulp and superabsorbent polymer particles wrapped in a tissue paper.
[0010]
The back sheet 3 extends outward from the side edge of the absorber 4 and constitutes a side flap 6. The side flaps 6 further extend outward at the position of the excretory part facing part A of the napkin 1 to form a pair of wings 7. Although not shown, an adhesive layer for fixing the napkin 1 to the clothing is formed on the clothing facing surfaces of the back sheet 3 and the wing 7, and the adhesive layer is not shown. Protected by release paper.
[0011]
The top sheet 2 and the back sheet 3 respectively extend from the front and rear ends of the absorber 4, and the extended top sheet 2 and the back sheet 3 are bonded and fixed to each other.
[0012]
A leak-proof groove 8 having a closed shape is formed on the top sheet side of the absorber 4. The leak-proof groove 8 has a shape close to an ellipse having a long axis in the length direction of the napkin 1, and a portion of the napkin 1 located at the excretory part facing part A is curved inward. The leak-proof groove 8 is formed by integrally compacting the absorber 4 and the top sheet 2.
[0013]
The leak-proof walls 5 disposed on the left and right sides of the napkin 1 are formed by processing a single belt-like sheet into a sleeve shape and a T-shape, and include a base wall portion 5a and the base wall portion 5a. An inward projecting portion 5b and an outward projecting portion 5c projecting inward and outward of the napkin 1, respectively.
[0014]
The base wall 5 a has a fixed end and a free end, and the fixed end is fixed on the side flap 6 at a position slightly outward from the side edge of the absorber 4. From the tip, the above-described inwardly projecting portion 5b and outwardly projecting portion 5c project inward and outward of the napkin 1, respectively.
[0015]
The inwardly projecting portion 5b and the outwardly projecting portion 5c project substantially horizontally so that their upper surfaces are located on the same plane. The overhangs of both overhang portions 5 b and 5 c extend over the entire length direction of the napkin 1. Further, the projecting widths of both projecting portions 5b and 5c are substantially the same.
[0016]
Elastic members 9 and 9 are disposed along the length direction of the distal ends of the both overhang portions 5b and 5c. The constituent material of the elastic member 9 is not particularly limited as long as it is usually used for absorbent articles, but polyolefins and polyurethane foams and natural rubber are particularly preferably used. The shape of the elastic member 9 can be a thread shape, a band shape, a film shape, or the like. In this embodiment, a flat, narrow band-like elastic member is used. The elastic member 9 is disposed at least on the excretory part facing part A of the napkin 1. Both elastic members 9 are fixed in an expanded state in a sheet forming the leak-proof wall 5. As this fixing means, a heat seal or a hot melt adhesive is used. The expansion ratios of both elastic members 9 are substantially the same. In the natural state of the napkin 1, the leak-proof wall 5 stands up reliably because the elastic member 9 contracts. According to the leak-proof wall 5 having such a configuration, as is apparent from the wearing state of the napkin 1 of the present embodiment shown in FIG. 4, the upper surfaces of the two overhang portions 5b and 5c are elastic to the wearer's thigh. In addition, since the surface sealing effect of close contact with the surface is exhibited, it is difficult to be affected by misalignment caused by the wearer's movement, and liquid leakage is effectively prevented. By arranging the elastic member 9 in each of the overhanging portions 5b and 5c, even in a situation where the leak-proof wall 5 is likely to be pushed inward due to the movement of the wearer, it is arranged in the outward overhanging portion 5c. A force that inclines the leak-proof wall 5 outwardly due to the tension of the elastic member 9 is effectively prevented, and the leak-proof wall 5 is effectively prevented from being pushed inward, and the thighs of the two protruding portions 5b and 5c High adhesion to the part is maintained. Further, by arranging the elastic member 9 at the tip of each of the overhanging portions 5b and 5c, the overhanging of the overhanging portions 5b and 5c in the horizontal direction is further stabilized, and the above-described face seal effect is further improved. To do.
[0017]
The leak-proof wall 5 stands only at the position of the excretory part facing part A, and at least the inwardly projecting part 5 is fixed to the top sheet 2 at the positions of the front part B and the rear part C. Inhibited (not standing). Thereby, the back sheet side of the napkin 1 is curved in a convex shape at the position of the excretory part facing part A, and the whole napkin becomes a shape along the wearer's body shape. As a result, the upper surfaces of the overhang portions 5b and 5c are more stably brought into close contact with the wearer's thighs, and a face sealing effect is further exhibited. In particular, when the wing 7 is provided outside the position where the leakage prevention wall 5 stands up as in the present embodiment, the leakage prevention wall 5 is caused by the folding of the wing 7 when the napkin 1 is attached. As a result, the leak-proof wall 5 is not easily pushed down inward and the liquid receiving area on the skin-facing surface side of the napkin 1 is widened.
[0018]
The inward projecting portion 5b is located above the absorber 4 at least in the excretory portion facing portion A of the napkin 1. Thereby, in the side part of the absorbent body 4, blood that has flowed laterally from the wearer's excretory part through the skin is formed by the inwardly projecting part 5 b and the base wall part 5 a (see FIG. 4) and is quickly absorbed by the absorbent body 4 located below the inwardly projecting portion 5b, further enhancing the effect of preventing side leakage. That is, a further leak-proof effect is manifested by a synergistic effect with the absorption effect of the liquid by the absorber 4.
[0019]
The inward projecting portion 5 b is located outward from the leakage prevention groove 8 at least in the excretion portion facing portion A of the napkin 1. As a result, as shown in FIG. 4, when the napkin 1 is attached, the leak-proof groove 8 along the length direction of the napkin 1 becomes the flexible axis X and is located outward from the leak-proof groove 8. The absorbent body 4 is bent to the back sheet side, the adhesiveness of the absorbent body 4 itself to the thigh is improved, and the surface sealing effect by the upper surfaces of the both overhang portions 5b and 5c is further improved. Furthermore, even when the leak-proof wall 5 is crushed under high mounting pressure, the liquid is guided along the leak-proof groove 8 in the length direction of the napkin, so that it is difficult for the liquid to reach the leak-proof wall 5. Even if it reaches, the absorber 4 is present in that portion, so that it is difficult for the liquid to get over the leak-proof wall 5 and to leak in the lateral direction. In general, if even a small amount of liquid adheres to the leak-proof wall 5, it is easy to give the wearer an impression that the entire napkin is very dirty, and there is a disadvantage that the napkin tends to be replaced with a small amount of absorption. In the napkin 1, since the liquid hardly reaches the leak-proof wall 5 due to the liquid induction effect by the leak-proof groove 8, such inconvenience hardly occurs.
[0020]
As described above, the side flap 6 is formed by extending the back sheet 3. And as above-mentioned, the back sheet 3 is comprised from the liquid-impermeable film sheet 3a and the liquid-absorbing nonwoven fabric 3b, and since this nonwoven fabric 3b is located in the skin opposing surface side, it is a side flap. The skin facing surface side of 6 is liquid absorbable. A liquid having a relatively low surface tension, for example, a liquid having a surface tension of 30 dyn / cm or less, may leak through the sheet depending on the type of the sheet constituting the leak-proof wall 5. By making the skin 6 facing surface side of the flap 6 liquid absorbable, the leaked liquid is absorbed by the side flap 6, and liquid leakage is reliably prevented. That is, the liquid absorbency means that at least a liquid having a surface tension of 30 dyn / cm or less can be absorbed.
[0021]
As the nonwoven fabric 3b located on the skin facing surface side of the side flap 6, fibers made of rayon, cotton, polyethylene, polypropylene, polyester, polyethylene-polypropylene, polyethylene-polyester composite fibers, or these conventionally used for absorbent articles Nonwoven fabric obtained from a mixture of these fibers. Examples of the nonwoven fabric include a suction nonwoven fabric, a spunbond nonwoven fabric, a melt blown nonwoven fabric, a water needling nonwoven fabric, and a composite nonwoven fabric thereof. A suction heat bond nonwoven fabric is preferably used from the viewpoints of touch, cushion feeling, and sufficient space for absorbing liquid.
[0022]
The hydrophilicity or water repellency of the surface of the nonwoven fabric 3b is not particularly limited as long as at least a liquid having a surface tension of 30 dyn / cm or less can be absorbed. However, if the hydrophilicity is too high, the liquid may be excessively diffused through the nonwoven fabric 3b. Therefore, the surface of the nonwoven fabric 3b is preferably weakly hydrophilic to hydrophobic. In particular, when the nonwoven fabric 3b has a hydrophilic surface, it is preferable to use a nonwoven fabric 3b having a Klem water absorption height of 30 mm or less after one minute in measurement of the Klem water absorption (JIS P8141). On the other hand, when the nonwoven fabric 3b has a hydrophobic surface that does not absorb water with a surface tension of 72 dyn / cm, it is preferably used as long as it can absorb a liquid with a surface tension of 30 dyn / cm.
[0023]
The height H (see FIG. 2) of the leak-proof wall 5 is 5 to 50 mm, particularly 10 to 40 mm, so that the leak-proof wall 5 does not feel strange and the leak-proof property of the leak-proof wall 5 is increased. To preferred. The distance W (see FIG. 2) between the distal end of the inwardly projecting portion 5b and the distal end of the outwardly projecting portion 5c is 6 to 40 mm, particularly 10 to 30 mm. It is preferable from the viewpoint of improvement of the surface sealing effect by the property and the both overhang portions 5b and 5c.
[0024]
The distance D (see FIG. 2) between the tip of the inwardly projecting portion 5b and the side edge of the absorbent body 4 is 3 to 30 mm, particularly 5 to 20 mm. The pocket portion 10 formed by the wall portion 5a is preferable in terms of the effect of receiving menstrual blood and improving the absorption capacity for absorbing the menstrual blood. Furthermore, the distance E (see FIG. 2) between the tip of the inwardly projecting portion 5b and the outer edge of the leakage preventing groove 8 is 1 to 30 mm, particularly 5 to 25 mm. The leak-proof wall 5 is pushed inward depending on the posture of the wearer, or the high leak-proof effect can be maintained even under a situation where the leak-proof wall 5 is crushed on the absorber 4 by the high mounting pressure due to sitting. preferable.
[0025]
The sheet constituting the leak-proof wall 5 is preferably a sheet having a good touch because the leak-proof wall directly contacts the skin. Moreover, it is preferable that it is a hydrophobic thing from a viewpoint which prevents the liquid of the low surface tension mentioned above permeate | transmitting. As a sheet satisfying these requirements, it is preferable to use an air-through nonwoven fabric, a spunbond nonwoven fabric, or a spunbond / melt blown composite nonwoven fabric made of hydrophobic fibers or hydrophobized.
[0026]
When the leak-proof wall 5 is comprised from a nonwoven fabric, as for this nonwoven fabric, the bulk softness measured about the length direction of the leak-proof wall 5 is 0.03-0.3N, especially 0.05-0.2N. It is preferable. On the other hand, the bulk softness measured in the width direction (height direction) of the leak-proof wall 5 is preferably 0.05 to 0.5N, and particularly preferably 0.07 to 0.3N. Furthermore, it is preferable that the bulk softness value in the width direction is equal to or greater than the bulk softness value in the length direction. By setting the bulk softness values in the length direction and the width direction of the nonwoven fabric within the above ranges, and the magnitude relationship between the two bulk softness values as described above, the elastic member disposed in the both overhang portions 5b and 5c 9 easily contracts in the length direction. Moreover, the surface sealing effect by both overhang | projection parts 5b and 5c of the leak-proof wall 5 and the standing property of the leak-proof wall 5 are stably maintained irrespective of a wearer's operation | movement. In order to make the bulk softness value in the width direction higher than the bulk softness value in the length direction, for example, a method of applying wave-like embossing or the like in the width direction of the nonwoven fabric is preferable.
[0027]
The bulk softness is measured by the following method. That is, using Tensilon (manufactured by Toyo Baldwin, model: RTM-25), a nonwoven fabric sample is cut into 120 mm × 10 mm to form a cylinder with a height of 10 mm, and its upper and lower ends are fastened with staples. make. The maximum load when the cylindrical sample is compressed in the height direction at a compression speed of 10 mm / min is measured, and the value is defined as a bulk softness value. The bulk softness value in the length direction refers to the value when the length direction of the nonwoven fabric is the compression direction, and the bulk softness value in the width direction is the value when the width direction of the nonwoven fabric is the compression direction. Say.
[0028]
The shapes of the inwardly projecting portion 5b and the outwardly projecting portion 5c in the leak-proof wall 5 are not limited to those described above. For example, both the protruding portions 5b and 5c do not need to protrude from the tip of the base wall portion 5a, and as shown in FIG. 5 (a), the tip of the upper portion of the base wall portion 5c. Alternatively, the inwardly projecting portion 5b may be projected from a slightly lower position, and the outwardly projecting portion 5c may be projected from the tip. In this case, the elastic member 9 may be arranged along the length direction of the leak-proof wall 5 also at the tip of the base wall portion 5c. Moreover, as shown in FIG.5 (b), in the leak-proof wall 5 shown in FIGS. 1-3, the front-end | tip part of the outward projecting part 5c may be hung down, and the elastic member 9 may be arranged in the hung part. Further, as shown in FIG. 5 (c), in the leak-proof wall 5 shown in FIGS. 1 to 3, the tip portions of the inwardly projecting portion 5b and the outwardly projecting portion 5c are suspended, and each suspended portion is elastic. The member 9 may be arranged. Further, the leak-proof wall 5 may be formed as shown in FIG. In FIG. 5D, reference numeral 11 denotes a hot melt adhesive.
[0029]
The present invention is not limited to the embodiment. For example, in the said embodiment, although the fixing | fixed part of the base wall part 5a in the leak-proof wall 5 was located in a little outward rather than the side edge of the absorber 4, it replaces with this and a fixing | fixed part of the absorber 4 is used. It may be positioned at the side edge or slightly inward from the side edge.
[0030]
Moreover, the leak-proof groove 8 does not need to be a closed shape, and is formed, for example, continuously or discontinuously along the length direction of the napkin 1 at a position inward from the side edge of the absorber 4. May be.
[0031]
In addition, the overhanging width of each of the inwardly projecting portion 5b and the outwardly projecting portion 5c may be the same or different depending on the specific application of the napkin 1 or the like.
[0032]
In the above embodiment, the elastic member 9 is disposed at the tip of each of the overhang portions 5b, 5c. Or you may arrange | position an elastic member over the whole. In addition, the position where the elastic member is disposed, the expansion ratio, and / or the number of the elastic member may be different between the inwardly projecting portion 5b and the outwardly projecting portion 5c.
[0033]
Moreover, although the napkin 1 of the said embodiment was a thing with a wing, it is not necessary to provide a wing according to a use.
[0034]
Further, instead of the liquid-absorbing non-woven fabric 3b constituting the side flap 6, a film (perforated film) that is provided with holes and capable of absorbing liquid may be used.
[0035]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the absorptive article with high fitting property and the liquid leak was prevented.
Further, according to the present invention, there is provided an absorbent article in which liquid leakage is prevented even when the leak-proof wall is crushed by the mounting pressure.
[Brief description of the drawings]
FIG. 1 is a plan view of a sanitary napkin as an embodiment of the absorbent article of the present invention as viewed from the top sheet side.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a cross-sectional perspective view taken along line II-II in FIG.
4 is a schematic view showing a state in which the napkin shown in FIG. 1 is mounted. FIG.
FIG. 5 is a schematic view showing another form of the leak-proof wall.
[Explanation of symbols]
1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 5 Leak-proof wall 6 Side flap 7 Wing 8 Leak-proof groove 9 Elastic member 10 Pocket part

Claims (6)

A liquid-permeable surface layer, a liquid-impermeable back layer, a liquid-retaining absorbent layer interposed between the two layers, and a leak-proof wall standing from the vicinity of the left and right side edges of the absorbent layer. In the absorbent article in which a leak-proof groove having a predetermined shape is formed on the surface layer side of the absorbent layer,
The leak-proof wall has a base wall part, and an inwardly extending part and an outwardly extending part that protrude from the upper part of the base wall part to the inside and the outside of the absorbent article, respectively.
An elastic member is disposed along the length direction at the tip of each of the inwardly extending part and the outwardly extending part, and the inwardly extending part is above the absorbent layer and An absorptive article positioned outside the leak-proof groove.   The absorbent article according to claim 1, further comprising a side flap extending outward from the leak-proof wall, wherein the skin facing surface side of the side flap is liquid-absorbable.   The absorptive article according to claim 2 provided with the wing part extended outside from said flap located in the outside of the position where said leak-proof wall stood up.   The height of the leak-proof wall is 5 to 50 mm, the distance between the tip of the inwardly projecting portion and the side edge of the outwardly projecting portion is 6 to 40 mm, the tip of the inwardly projecting portion and the above The distance between the side edge of the absorbent layer is 3 to 30 mm, and the distance between the tip of the inward projecting portion and the outer edge of the leak-proof groove is 1 to 30 mm. The absorbent article as described.   The leak-proof wall is composed of a nonwoven fabric, and the bulk softness of the nonwoven fabric is 0.03 to 0.3 N in the length direction of the leak-proof wall and 0.05 to 0.5 N in the width direction, The absorbent article according to any one of claims 1 to 4, wherein the bulk softness value in the width direction is equal to or greater than the bulk softness value in the length direction.   The absorptive article according to any one of claims 1 to 5 in which said leak-proof wall stands up in the part which counters a wearer's excretion part at the time of wear.

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