JP4084938B2 - Body fluid absorbent article - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a body fluid-absorbing wearing article such as a disposable diaper, training pants, a sanitary napkin, and a urine absorbing pad.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in body fluid-absorbing wearing articles such as disposable diapers, body fluid-absorbing cores are flexible and have a substantially uniform thickness. In addition, a core in which a groove that extends intermittently in the length direction is formed in the core and flexibility in a direction orthogonal to the groove is improved is also well known.
[0003]
[Problems to be solved by the invention]
When a disposable diaper, which is an example of a body fluid absorbent wearing article, is worn, the core located in the crotch region is deformed so as to bend or bend in the width direction. At that time, those having a uniform thickness may be irregularly deformed due to the high rigidity provided by the thickness, and the sides of the core may be difficult to adhere to the legs. In addition, the core formed so that the groove extends intermittently still has high rigidity between the grooves, that is, the part where the groove is not formed, so that the side portion of the core is closely attached to the periphery of the leg. It may interfere with the deformation. Thus, depending on the deformation of the core of the conventional diaper, the side part in the crotch region may be difficult to adhere to the circumference of the wearer's leg and body fluid may easily leak from the side part of the diaper.
[0004]
In this invention, it is a subject to improve a wear article so that favorable adhesion with the side part and skin of a bodily fluid absorptive wear article may be obtained, and to improve leak prevention performance in the wear article.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention is directed to a body fluid-absorbing core interposed between a liquid-permeable inner sheet that comes into contact with the skin and a liquid-impermeable outer sheet that faces the inner sheet, A body fluid-absorbing wearing article in which a core has a length direction, a width direction orthogonal to the length direction, and a thickness direction.
[0006]
In the body fluid-absorbing wearing article, the present invention is characterized as follows. The core includes water-absorbing fibers, and both side portions in the width direction are formed thin, and a central portion between the both side portions is formed thicker than the both side portions toward the upper side in the thickness direction. The central portion and the core portions of the both side portions are made of the same material and are continuous with each other. The first core extending in the length direction and the thickness placed on each of the both side portions to reach the top of the central portion. And a second core extending in the length direction. These first and second cores are separate bodies, and each is covered with a liquid-permeable sheet having body fluid diffusibility.
[0007]
The present invention has the following preferred embodiments.
(1) The core includes water-absorbing fibers, and both side portions in the width direction are formed thin, and a central portion between the both side portions is formed thicker than the both side portions toward the upper side in the thickness direction. In addition, the central portion and the core portions of the both side portions are made of the same material and are continuous with each other. The first core extending in the length direction is placed on each of the both side portions and is placed on the top portion of the central portion. A second core extending in the longitudinal direction and having a thickness that can be reached, wherein the first and second cores are separate, each having liquid permeability and body fluid diffusibility . Covered with two coated papers, the body fluid diffusion rate of the second coated paper is lower than that of the first coated paper, the first coated paper quickly absorbs the body fluid on the inner sheet, The body fluid is divided into a length direction, a width direction, and a thickness of the first core. To spread quickly in the direction.
(2) The central portion of the first core is formed such that the density is higher than the density of the water-absorbing fibers in the second core.
(3) The first core is formed such that the rigidity of the both side portions is higher than the rigidity of the central portion of the first core and the rigidity of the second core.
(4) As for the said 1st core, the said both sides are compressed more strongly than the said center part.
(5) The inner sheet forms a large number of pleats extending in the length direction while repeating undulations in the width direction.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Taking a disposable diaper as an example of the body fluid-absorbing wearing article, the details of the present invention will be described with reference to the accompanying drawings.
[0009]
A disposable diaper 1 shown in a partially broken perspective view in FIG. 1 includes a liquid-permeable inner sheet 2 that comes into contact with the wearer's skin, and a liquid-impervious outer sheet 3 that faces the inner sheet 2 and comes into contact with clothing. The body fluid absorbent core 4 is interposed between the two sheets 2 and 3. In the length direction of the diaper 1, a front waistline region 6, a back waistline region 7, and a crotch region 8 located between these regions 6 and 7 are formed. The diaper 1 also has a width direction and a thickness direction perpendicular to the length direction, and the width direction coincides with the wearer's torso direction. The inner and outer surface sheets 2 and 3 extend from the peripheral edge of the core 4 and overlap each other, and are joined to each other to form front and rear end flaps 11 and 12 and a pair of side flaps 13. In each of these flaps 11, 12, and 13, a waist elastic member 14 made of an elastic ribbon and a leg elastic member 16 are joined to at least one inner surface of the inner and outer sheets 2 and 3 in an extended state. A tape fastener 20 extends laterally from the side flap 13 in the rear waistline region 7.
[0010]
The core 4 is located on the outer sheet 3 and has a thick central portion 17 in the width direction and thin side portions 18 and core members of the central portion 17 and both side portions 18 are made of the same material and are continuous with each other. The first core 21 is formed separately from the first core, and the second core 22 is formed on each of the both side portions 18. The first core 21 is covered with a liquid-permeable first coated paper 23, and the second core 22 is covered with a liquid-permeable second coated paper 24.
[0011]
FIG. 2 shows a section taken along the line II-II in FIG. 1, and the line II-II lies in the crotch region 8 and bisects the length of the diaper 1. The first core 21 and the second core 22 are water absorbent fibers such as pulverized pulp, a mixture of water absorbent fibers and thermoplastic synthetic fibers, a mixture of water absorbent fibers and superabsorbent polymer particles, water absorbent fibers and heat. It is formed by covering a mixture of plastic synthetic fibers and superabsorbent polymer particles with the first or second coated paper 23, 24 having body fluid diffusibility and liquid permeability such as tissue paper. An example of pulp 26 covered with tissue paper is shown.
[0012]
In the first core 21, each of the central portion 17 and both side portions 18 has widths p and q and thicknesses a and b. The width p occupies 20 to 80% of the width w of the core 4 in the crotch region 8, and the width q occupies 40 to 10% of the width w. Both side portions 18 have a thickness b in the range of 20 to 80% of the thickness a of the central portion 17, and are preferably formed by compressing the aggregate of pulverized pulp 26 more strongly than the central portion 17. Yes. Such a first core 21 has a basis weight in the range of 200 to 800 g / m ² , a density d ₁ of the central portion 17 is in the range of 0.04 to 0.08 g / cm ³ , density _{d 2} is in the range of 0.08~0.2g / cm ^3, the difference is preferably greater than 0.01 between the two densities _{d 1} and _{d 2.} Both side portions 18 formed in this way have higher rigidity than the central portion 17.
[0013]
In the second core 22, the width r is substantially the same as the width q of the side portions 18 of the first core 21, and the thickness c is substantially equal to the difference between the thicknesses a and b of the first core 21. Are the same. The top portion 28 of the second core 22 does not exceed the top portion 27 of the first core 21, and the top portion of the core 4 formed by these top portions 27 and 28 is substantially flat. The second core 22 has a side edge portion 42 located immediately above the side edge portion 41 of the first core 21. The cross-sectional shape of the core 4 in which the second core 22 is formed in this way is a rectangle. The second core 22 has a basis weight in the range of 200 to 600 g / m ² , a density d ₃ in the range of 0.04 to 0.08 g / cm ³ , and a preferred density d ₃ is higher than the density d _1. It will not grow.
[0014]
The body fluid diffusible and liquid permeable first coated paper 23 covering the first core 21 quickly absorbs the body fluid on the inner surface sheet 2 and absorbs the body fluid in the length direction and the width direction of the first core. And can diffuse quickly in the thickness direction. In the present invention, the fact that the first coated paper 23 is body fluid diffusible means that the diffusion rate in the coated paper 23 is higher than the diffusion rate of the water-absorbing fibers in any part of the first core 21. The second coated paper 24 that covers the second core 22 has a body fluid diffusion rate that is the same as or lower than that of the first coated paper 23. The second coated paper 24 having a low body fluid diffusion rate in the width direction of the diaper 1 has an effect of suppressing the body fluid from flowing from the center to the side of the diaper 1 and preventing side leakage of the body fluid.
[0015]
FIG. 3 is a drawing of the diaper 1 similar to FIG. 2, but the diaper 1 at this time is in a worn state, and the crotch region 8 (see FIG. 1) is applied to the crotch of the diaper wearer indicated by the phantom line. It has been broken. The entire width of the diaper 1 is curved with the inner side convex, and the second core 22 located on the side of the diaper 1 is in close contact with the wearer's leg. The core 4 has a substantially uniform thickness a in the crotch region 8, but the side portion is formed by a first core 21 and a second core 22 that is separate from the first core. Since the two side portions 18 of the one core 21 are thin and the separate second core 22 placed on the both side portions 18 does not restrain the movement of the both side portions 18, The entire width of the core 4 is easily curved as shown in the figure, so that the second core 22 and the side flap 13 are in close contact with each other around the legs. The diaper 1 in such a wearing state exhibits excellent prevention performance against side leakage of body fluid in the crotch region 8. The first core 21 and the second core 22 are striped in the length direction on the first coated paper 23 or the second coated paper 24 to the extent that they do not hinder the mutual movement when the diaper 1 is worn. Only a small part in the width direction can be joined by the applied hot melt adhesive.
[0016]
In the diaper 1 is Such formed by the density d ₂ of the side portions 18 of the first core 21 higher than the density d ₁ of the center portion 17, also the density d ₁ of the central portion 17 and the second core By making the density d ₃ higher than 22, body fluid diffuses from the central portion 17 toward the side portion 18 in the first core 21. Further, body fluid diffuses from the second core 22 toward the first core 21 between the first core 21 and the second core 22. When the body fluid tends to collect below the first core 21 in this way, it is less likely that the body fluid flows in the width direction on the inner sheet 2 and leaks from the side portion of the diaper 1. Further, in the first core 21, the side portion 18 having high rigidity bends in the vicinity of the boundary with the central portion 17 having low rigidity, so that the second core 22 can be well adhered to the leg periphery from the side. .
[0017]
FIG. 4 is a drawing similar to FIG. 2 showing an example of the embodiment. In this diaper 1, the inner sheet 2 that comes into contact with the wearer's skin repeats undulations in the width direction of the diaper 1, and the undulations extend in the length direction of the diaper 1 to form a large number of pleats 31. Such an inner surface sheet 2 is joined to a flat liquid-permeable second inner surface sheet 32 in the valley portion 33 of the pleat 31. In the side flap 13 of the diaper 1, instead of the inner surface sheet 2, the second inner surface sheet 32 overlaps the outer surface sheet 3 and is joined to each other to form the side flap 13. A large number of pleats 31 extending in the length direction of the diaper 1 fill a space between the core 4 and the wearer's skin, and the top surface 36 of the mountain portion 34 comes into contact with the skin so that bodily fluids are disposed below the core 4. The body fluid is prevented from flowing in the width direction of the diaper 1 and the side leakage of the body fluid is prevented. In this diaper 1, as shown in FIG. 3, the entire width of the core 4 is uniformly curved, so that a large number of pleats 31 spread greatly in the width direction. Although not shown, a known leak-proof cuff that extends in the length direction of the diaper 1 and has a propensity to stand up above the inner surface can be provided on the inner surface of the side flaps 13 of the diaper 1.
[0018]
In the present invention in which the absorbent core 4 is formed in this way, in addition to the disposable diaper as shown in the illustrated example, it is a body fluid-absorbing wearing article such as training pants, a sanitary napkin, and a urine absorbing pad, more preferably a disposable body fluid. It can be implemented with an absorbent wearing article. Superabsorbent polymer particles can be mixed in the first core 21 and the second core 22 forming the core 4 up to 60% by weight.
[0019]
【The invention's effect】
In the bodily fluid absorbent wearing article according to the present invention, the water absorbent core includes water absorbent fibers, both side portions in the width direction are formed thin, and a central portion between the both side portions is directed upward in the thickness direction. The central portion and the core portions of the both side portions are made of the same material and are continuous with each other, and the both side portions of the core are separated from the first core and the first core. The second core is formed with the second core, the thickness of the first core is reduced at both side portions thereof, and the second core placed on the first core does not restrain the free movement of the core . Therefore, in the crotch region of the diaper in the worn state, the entire width is curved uniformly, and the side portion of the core and the circumference of the wearer's leg are in close contact with each other, so that side leakage of body fluid can be effectively prevented.
The first and second cores are covered with first and second coated papers having liquid permeability and body fluid diffusibility, respectively, and the body fluid diffusion speed of the second coated paper is higher than that of the first coated paper. Lowered . Therefore, the first coated paper can quickly absorb the body fluid on the inner sheet, and can quickly diffuse the body fluid in the length direction, the width direction, and the thickness direction of the first core. it can.
[Brief description of the drawings]
FIG. 1 is a partially broken perspective view of a disposable diaper.
FIG. 2 is a view showing a cross section taken along line II-II in FIG. 1;
FIG. 3 is a diagram showing a state where the diaper of FIG. 2 is curved.
FIG. 4 is a view similar to FIG. 2 showing an example of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Inner surface sheet 3 Outer surface sheet 4 Core 17 Center part 18 Side part 21 1st core 22 2nd core 23 Liquid permeable sheet 24 Liquid permeable sheet 26 Water absorbing fiber 31 Fold

Claims (6)

A body fluid-absorbing core is interposed between a liquid-permeable inner sheet that contacts the skin and a liquid-impermeable outer sheet that faces the inner sheet, and the core has a length direction and a width direction orthogonal to the length direction. In a body fluid absorbent wearing article having a thickness direction,
The core includes water-absorbing fibers, and both side portions in the width direction are formed thin, and a central portion between the both side portions is formed thicker than the both side portions toward the upper side in the thickness direction. The central portion and the core portions of the both side portions are made of the same material and are continuous with each other. The first core extending in the length direction and the thickness placed on each of the both side portions to reach the top of the central portion. A first core and a second coated paper each having a liquid permeability and a body fluid diffusibility, wherein the first and second cores are separated from each other. The body fluid diffusion rate of the second coated paper is lower than that of the first coated paper, and the first coated paper quickly absorbs the body fluid on the inner surface sheet and absorbs the body fluid. The length direction, width direction, and thickness direction of the first core The body fluid absorbent wearing article, characterized by quickly diffused.   The body fluid-absorbing wearing article according to claim 1, wherein the first core is formed such that a density of the water-absorbing fibers in the both side portions is higher than a density of the water-absorbing fibers in the central portion.   The bodily fluid-absorbent wearing article according to claim 1 or 2, wherein the central portion of the first core is formed so that the density is higher than the density of the water-absorbing fibers in the second core.   The bodily fluid according to any one of claims 1 to 3, wherein the first core is formed such that the rigidity of the both side portions is higher than the rigidity of the central portion of the first core and the rigidity of the second core. Absorbent wearing article.   The body fluid-absorbing wearing article according to any one of claims 1 to 4, wherein the first core has the both side portions compressed more strongly than the central portion.   The body fluid-absorbing wearing article according to any one of claims 1 to 5, wherein the inner sheet forms a large number of pleats extending in the length direction while repeating undulations in the width direction.

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