JP6506936B2 - Absorbent articles - Google Patents

Description

  The present invention is an absorbent article mainly used for sanitary napkins, cushion sheets, incontinence pads, toiletries, etc., and more specifically, a structure which does not impair the adhesion to the skin surface even if the body fluid is repeatedly discharged. An absorbent article provided with the

  Conventionally, as absorbent articles such as panty liners, sanitary napkins and incontinence pads, liquid-impervious back sheets such as polyethylene sheets or polyethylene sheet-laminated non-woven fabrics and liquid-pervious top sheets such as non-woven fabrics or liquid-permeable plastic sheets What intervened the absorber which consists of cotton-like pulp etc. is known.

  Many improvements have been made to this type of absorbent article, and various measures have been taken to improve the adhesion to the skin surface when worn. For example, in Patent Document 1 below, a bulging means provided between the top sheet and the absorber so as to extend along the longitudinal center line of the absorbent article and causing the longitudinal direction of the top sheet to bulge. The bulging means includes a plurality of elastic members extending along both sides of the longitudinal center line of the absorbent article, and a liquid-permeable top surface joined near the longitudinal center line of the top sheet, A pair of rising portions extending downward from both lower portions of the longitudinal center line of the top surface portion and rising on the top sheet side due to the contraction stress of the elastic member, and the rising portions respectively extend outward and an absorber A pair of fixed portions fixed to the inner surface of the absorbent article, and an inner space formed along the longitudinal center line of the absorbent article, which is formed by being surrounded by the absorber, the top surface portion and the pair of upright portions Article is disclosed

  Further, in Patent Document 2 below, a liquid-permeable sheet is provided on the surface of the absorbent body, and the liquid-permeable sheet is used on the surface of the absorbent body having the elastic member and the surface of the absorbent body on both sides. It has a side fixing portion to be fixed and a pair of rising portions connecting the skin contact portion and the side fixing portion, and the skin contact portion is provided with an elastic stretchable portion, and this elastic stretch The skin contact part is separated from the surface of the absorber by the elastic contraction force in the longitudinal direction of the part, and on the absorber, a longitudinally extending cavity surrounded by the skin contact part and the rising part Disclosed is an absorbent article in which a part is formed.

JP 2007-135941 A JP, 2006-271649, A

  However, in the absorbent articles described in Patent Documents 1 and 2, the top sheet and the absorber are obtained by interposing between the top sheet and the absorber the swelling means which stands up on the surface side by the contraction force of the elastic member. There is a structure in which only the top sheet is in close contact with the body, but in the case of an absorbent article that is worn for a long time, such as a night napkin, lift the surface material only to the surface to make it adhere to the body. Even if the surface material can not withstand the movement of the body and is pulled or crushed, the surface material may be distorted or wrinkled, and this may develop into the entire absorbent article, resulting in adhesion with the body. There was a risk of leakage and leakage.

  Moreover, in a general absorbent article which does not have such a swelling means, when the body fluid is discharged a plurality of times repeatedly while being worn for a long time such as a night napkin, the absorber repeatedly It has been pointed out that as a result of absorbing the heat, the absorber becomes loose, the thickness of the absorber decreases, and as a result, a gap between the skin and the skin surface, the body fluid tends to leak.

  Therefore, the main object of the present invention is to prevent the occurrence of surface distortion and wrinkles, and to prevent the leakage of body fluid without reducing the adhesion to the skin surface even when the absorber is slumped due to repeated body fluid absorption. An absorbent article is provided.

In order to solve the above problems, according to the present invention according to claim 1, in an absorbent article in which an absorbent is interposed between a liquid-permeable top sheet and a back sheet,
Between the absorbent body and the liquid-permeable topsheet, a direction orthogonal by Rukoto deflated like bellows by thread resilient and elastic members in the direction of arrangement of the resilient and elastic members, crease fold projects into the skin side And a high-restorable sheet member provided with a large number of folds in which creases and folds protrude to the non-skin side are alternately formed, and the high-restoration sheet member is made of non-woven fabric or mesh sheet A plurality of the thread-like elastic stretchable members between the upper layer sheet material and the lower layer sheet material in a predetermined direction at intervals and in an extended state,
The high-restorable sheet member is characterized in that the folds of the folds are formed along the width direction of the absorbent article by arranging the thread-like elastic stretch members along the longitudinal direction of the absorbent article. An absorbent article is provided.

In the invention according to the first aspect , the folds are protruded between the absorber and the liquid-permeable surface sheet in the direction perpendicular to the disposition direction of the elastic stretchable member by the contraction force of the thread-like elastic stretchable member. Since the high restorability sheet member provided with a large number of folds in which the mountain folds and the valley folds in which the folds protrude to the non-skin side alternately and repeatedly formed is interposed, the high restorability described above is contracted in a bellows shape The cushioning property is given between the absorber and the liquid-permeable surface sheet by utilizing the resilience of the sheet member, and the surface material is in close contact with the skin surface. Therefore, since only the liquid-permeable surface sheet is not expanded to the skin side as in the conventional absorbent articles, it is a case involving intense physical movement while wearing for a long time as in a night napkin etc. However, the integrity of the surface material and the absorber is not impaired, and it is difficult for the surface material to be distorted or wrinkled.

  In addition, even if the absorbent body becomes stagnant due to repeated absorption of body fluid, the cushioning property of the high-restoration sheet member can prevent the formation of a gap between the absorbent body and the liquid-permeable surface sheet, and it is liquid-permeable Since the state in which the surface sheet is in close contact with the skin surface is maintained, the body fluid can be absorbed quickly by the absorber, so that the body fluid leakage can be prevented.

  The highly recoverable sheet member is formed by joining a plurality of the thread-like elastic stretchable members between an upper layer sheet material made of a non-woven fabric or a mesh sheet and a lower layer sheet material in a stretched state at intervals in a predetermined direction. It is configured to be contracted in a bellows shape by the contraction force by the thread-like elastic stretchable member.

Then, the high resilient sheet member, by arranging along the threadlike resilient and elastic members in the longitudinal direction of the absorbent article, the fold of the pleat is that is formed along the width direction of the absorbent article Thus, the surface of the absorbent article can easily follow the lines of the body.

  According to a second aspect of the present invention, there is provided the absorbent article according to the first aspect, wherein the highly restorable sheet member is disposed in a range including a region corresponding to a body fluid discharge site.

  In the invention according to the second aspect, the range in which the high-restoration sheet member is disposed is specified, and in order to enhance the adhesion between the surface and the skin surface even when the absorbent body is worn, at least the body fluid is discharged. It is preferable to arrange in the range including the area | region corresponding to a site | part.

  According to the present invention as described above, according to the present invention, the surface material is less likely to be distorted or wrinkled, and adhesion to the skin surface is not reduced even if the absorbent is repelled due to repeated absorption of bodily fluid, and leakage of bodily fluid is It can be prevented.

It is a partially broken development view of the sanitary napkin 1 according to the present invention. It is an II-II arrow line view of FIG. It is an III-III arrow line view of FIG. It is a longitudinal cross-sectional view (IV-IV arrow directional view of FIG. 1) of the sanitary napkin 1. FIG. (A) is an extended state of elastic elastic member 23, (B) is a perspective view of highly restorable sheet member 20 showing a contracted state (natural state). It is a longitudinal cross-sectional view of the sanitary napkin 1 which shows the state which absorbed the bodily fluid repeatedly. It is an expanded view of the sanitary napkin 1 which concerns on the other embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of sanitary napkin 1]
The sanitary napkin 1 comprises a liquid-impervious back sheet 2 made of a polyethylene sheet or the like, a liquid-pervious surface sheet 3 for rapidly transmitting menstrual blood, a cage, etc. An absorbent body 4 made of the cotton-like pulp or synthetic pulp, and a covering sheet 5 made of crepe paper or non-woven fabric surrounding the absorbent body 4 for shape retention and diffusion improvement of the absorbent body 4; The hydrophilic second sheet 6 disposed between the liquid-pervious surface sheet 3 and the absorbent body 4 and the substantially side edge portion of the absorbent body 4 as a standing base end, and at least including the body fluid discharge part H In the predetermined section in the front and back direction, it is mainly composed of a pair of left and right solid gathers BS, which are provided on the surface side so as to protrude on the surface side, and side non-woven fabric 7 forming BS, and around the absorber 4 At the edge, the outer edge of the liquid-impervious backsheet 2 and the liquid-permeable topsheet 3 is joined by an adhesive such as hot melt or a bonding means such as heat seal, and at both edges from the absorber 4 The liquid-impervious backsheet 2 and the side non-woven fabric 7 extending laterally are joined together by an adhesive such as hot melt or an adhesive means such as heat seal, and the impervious backsheet 2 and the side The wing-like flaps W and W which protrude sideward are formed by the lamination sheet part by the nonwoven fabric 7, and the second wing-like flaps W _B and W _B are formed in the part located on the heel side from this. There is.

Hereinafter, the structure of the sanitary napkin 1 will be described in more detail,
As the liquid-impervious back sheet 2, a sheet material having at least water shielding such as polyethylene is used, but in recent years, there is a tendency that a material having moisture permeability is used from the viewpoint of preventing bleeding. As this water-impervious and moisture-permeable sheet material, a microporous obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and stretching in a uniaxial or biaxial direction A sheet is preferably used. One or more adhesive layer (not shown) is formed on the non-use side (outer surface) of the liquid-impervious back sheet 2 so as to fix the sanitary napkin 1 to the undergarment when worn on the body It has become. As the liquid-impervious backsheet 2, a polylaminated non-woven fabric in which a plastic film and non-woven fabric are laminated may be used.

  Next, a porous or non-porous non-woven fabric, a porous plastic sheet or the like is suitably used as the liquid-permeable surface sheet 3. The material fibers constituting the non-woven fabric may be synthetic fibers of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc., regenerated fibers such as rayon or cupra, natural fibers such as cotton, etc. A nonwoven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a meltblown method, a needle punch method can be used. Among these processing methods, the spun lace method is excellent in flexibility and drapability, and the thermal bonding method is excellent in bulkiness and high compression recovery. When a large number of through holes are formed in the liquid-permeable surface sheet 3, menstrual blood, cages and the like (hereinafter collectively referred to as body fluid) are rapidly absorbed, and dry touch properties are excellent. It becomes a thing.

  The absorbent 4 interposed between the liquid-impervious backsheet 2 and the liquid-permeable topsheet 3 is made of, for example, cotton-like pulp and a water-absorbent polymer. The water-absorbing polymer is mixed, for example, as granular powder in the pulp constituting the absorbent. Examples of the pulp include cellulose fibers such as chemical pulp and dissolved pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate, and softwood pulp having a longer fiber length than hardwood pulp functions and It is suitably used in terms of price. In addition, synthetic fibers may be mixed in the absorber 4. Examples of the synthetic fibers include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, copolymers of these, and the like. It may be a mixture. In addition, composite fibers such as core-sheath fibers, side-by-side fibers, and split-type fibers, in which fibers having a high melting point are cored and fibers having a low melting point are sheathed, can also be used. In the case of a hydrophobic fiber, it is desirable to use the synthetic fiber surface-treated with a hydrophilizing agent so as to have an affinity for body fluid.

  The absorbent body 4 is disposed in a region including the substrate absorbent body 4A and at least a portion corresponding to the blood outlet H of the wearer, and is raised in the central middle height protruding toward the skin side from the substrate absorbent body 4A. It is preferable to be composed of a portion 4B and a rear middle high portion 4C which is disposed at the rear end of the sanitary napkin 1 according to need and which protrudes to the skin side more than the base absorbent body 4A. The central middle high portion 4B is formed in a size sufficient to cover the outlet H of the wearer and the periphery thereof, and extends to the region corresponding to the buttocks groove at the rear. The central middle high portion 4B may be formed only in the region corresponding to the blood outlet, but it is preferable that the rear is extended to the perineal portion or the groin groove. The rear middle high portion 4C is located rearward of the buttocks groove, and is for catching body fluid that leaks to the rear side along the possible buttocks groove.

  In this sanitary napkin 1, a pair of left and right central compressed grooves 16 are formed along the substantially longitudinal direction of the sanitary napkin 1 from the outer surface side of the liquid-permeable top sheet 3 so as to surround the central middle high portion 4B. preferable. The central squeezing groove 16 may have a portion formed on the left and right along the substantially longitudinal direction of the sanitary napkin 1 at least on both sides of the width direction center line CL, and in the illustrated example, the left and right front ends The portion and the rear end portion are connected to each other, and are formed in a shape elongated in the longitudinal direction of the napkin as a whole and closed in the circumferential direction. The central pressing groove 16 is provided outside the outer edge of the central middle high portion 4B so as to surround the central middle high portion 4B.

  Further, the front compressed groove 16a having a substantially Ω shape in plan view is formed to be spaced apart on the front side of the central compressed groove 16 and is separated on the rear side from the central compressed groove 16 and surrounds the rear middle high portion 4C. Thus, the rear side pressing groove 16b having a substantially reverse Ω shape in plan view is formed. The front squeezing groove 16a and the rear squeezing groove 16b are for reliably capturing the body fluid transmitted to the front side and the rear side of the surface of the sanitary napkin 1, and preventing the body fluid from leaking.

  The hydrophilic second sheet 6 disposed between the liquid-permeable surface sheet 3 and the absorber 4 may be any one having hydrophilicity to body fluid. Specifically, the material itself is made hydrophilic by using regenerated fibers such as rayon and cupra, and natural fibers such as cotton, or the synthesis of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. The fiber which surface-treated the fiber by the hydrophilization agent, and provided hydrophilic property can be used.

On the other hand, the width dimension of the liquid-pervious surface sheet 3 is slightly longer than the width of the absorber 4 in the illustrated example, as shown in the cross sectional views of FIG. 2 and FIG. The purpose of the three-dimensional gather BS is to prevent the penetration of the side non-woven fabric 7 different from the liquid-permeable surface sheet 3, specifically, menstrual blood and cages, etc., or to enhance the touch feeling etc. In accordance with the above, it is configured using a non-woven material that has been subjected to an appropriate water repelling treatment or a hydrophilic treatment. As the side non-woven fabric 7, a natural fiber, a synthetic fiber, a regenerated fiber or the like can be used as a material, and one formed by an appropriate processing method can be used. In order to achieve this, it is preferable to use a non-woven fabric that is breathable with a reduced basis weight. Specifically, it is desirable to use a non-woven fabric manufactured at a basis weight of 13 to 23 g / m ² , and in order to reliably prevent the permeation of body fluid, silicon-based, paraffin-based, alkylchromic chloride-based water repellent, etc. A water repellent treated nonwoven fabric coated with is preferably used.

The side non-woven fabric 7 is, as shown in FIGS. 2 and 3, from the inside position of the absorber 4 to the outer edge of the liquid-impervious back sheet 2 slightly beyond the absorber side edge, A pair of left and right wings are bonded to the side portion of the absorbent body substantially corresponding to the body fluid discharge portion by bonding with an adhesive such as hot melt over the range, and the laminated sheet portion of the side non-woven fabric 7 and the liquid impermeable back sheet 2 The flaps W, W are formed, and the second wing-shaped flaps W _B , W _B are formed at the buttock-side position from this. An adhesive layer (not shown) is provided on the outer surface side of each of the wing-shaped flaps W and W and the second wing-shaped flaps W _B and W _B , and the wing-shaped flaps W and W are folded back when attached to a short. It is turned to the opposite side at the RL position and wound around the crotch portion of the shorts for fastening.

  On the other hand, the inward side portion of the side non-woven fabric 7 is folded back in a substantially double manner, and a filiform elastic stretchable member in which the appropriate position of both ends or the longitudinal direction is fixed inside the double sheet 14 are disposed, and in a state in which a plurality of, in the illustrated example, two thread-like elastic stretchable members 15 and 15 are fixed at both ends or an appropriate position in the longitudinal direction on the upper portion of the thread-like elastic stretchable member 14 It is arranged. In addition, one or a plurality of, in the illustrated example, two thread-like elastic stretchable members 13, 13 are disposed at the rising proximal end from the absorber 4 in a state in which appropriate positions of both ends or the longitudinal direction are fixed. ing. The double sheet portion is bonded to the absorbent body 4 side in a state of being folded and laminated in a Z-shaped cross section at the front and rear end portions as shown in FIG. As the inflection points, solid gathers BS, BS are formed, standing up on the surface side while forming pockets P, P having openings directed inward in a cross-sectional V-shape.

[Highly Recoverable Sheet Member 20]
In the sanitary napkin 1, the high restorability sheet member 20 which is contracted in a bellows shape by the elastic stretchable member 23 is interposed between the absorbent body 4 and the liquid-permeable surface sheet 3. In the bellows-like shape, a mountain fold in which the folds protrude to the skin side and a valley fold in which the folds protrude to the non-skin side are alternately formed in a direction substantially orthogonal to the disposition direction of the elastic stretchable member 23. In other words, it is in a wave-like state in which a large number of wrinkles protruding to the skin side and the non-skin side are provided in a cross-sectional view with respect to the disposition direction of the elastic stretchable member 23. A state in which a large number of folds are formed by contracting in a bellows shape may be formed at least on both side edges with respect to the disposition direction of the elastic stretchable member 23, and mountain folds formed on the both side edges and It is not necessary for the valley folds to be formed continuously in the width direction of the high resilience sheet member 20 (the direction orthogonal to the disposition direction of the elastic stretchable member 23). That is, a fold (a mountain fold or a valley fold) extending in a direction substantially orthogonal to the disposition direction of the elastic stretchable member 23 from the side edge of one side is absorbed or branched into adjacent folds along the way And may be formed discontinuously in the width direction.

  The high recovery sheet member 20 is, as shown in FIG. 5, an upper layer sheet material 21 made of a nonwoven fabric or a plastic mesh sheet having a large number of holes, and a nonwoven fabric or a plastic mesh having a large number of holes. Between the lower layer sheet member 22 made of a sheet, the elastic stretchable member 23 in the stretched state is joined by a hot melt adhesive or the like for the entire length in the longitudinal direction or an appropriate position. The highly recoverable sheet member 20 is interposed between the absorbent body 4 and the liquid-permeable surface sheet 3 in a state of being contracted in a bellows-like manner by the contraction force of the elastic stretchable member 23. The material and basis weight of the upper layer sheet material 21 and the lower layer sheet material 22 may be the same or different.

  As the elastic stretchable member 23, it is preferable to use a thread-like elastic stretchable member, and as shown in FIG. 5, a plurality of the sheet members 21 and 22 are spaced in a predetermined direction, seven in the illustrated example It is preferable to set. Instead of the thread-like elastic stretchable member, a tape-like elastic stretchable member or a stretchable sheet material may be bonded in an extended state.

  The expansion ratio of the elastic stretchable member 23 may be 0.5 to 5 times, preferably 1 to 3.5 times when the natural state not to be expanded is 0 times. However, the appropriate elongation rate also differs depending on the fabric weight and the material of the upper layer sheet material 21 and the lower layer sheet material 22. It is preferable that the expansion ratio of the elastic stretchable member 23 be the same for all the elastic stretchable members 23 so that a substantially uniform contraction force acts on the entire surface of the upper layer sheet 21 and the lower layer sheet 22.

  The distance between the plurality of elastic stretchable members 23 may be 3 mm to 7 mm, preferably about 5 mm. It is preferable that this interval be the same between all the elastic stretchable members 23 and 23 so that substantially uniform contraction force acts on the entire surface of the upper layer sheet material 21 and the lower layer sheet material 22.

  In order to manufacture the high-restoration sheet member 20, as shown in FIG. 5A, the circumferential surface of a plurality of elastic stretchable members 23, 23... Drawn out with a predetermined tension at predetermined intervals. After applying an adhesive such as a hot melt adhesive, the upper layer sheet material 21 and the lower layer sheet material 22 are joined to the upper and lower surfaces of the elastic stretchable members 23, 23, respectively. Thereafter, by releasing the tension of the elastic stretchable member 23, as shown in FIG. 5 (B), it is possible to obtain a high-restoration sheet member 20 which is contracted in a bellows shape.

  The high resilience sheet member 20 is disposed in a range including a region corresponding to the drainage port H, as shown in FIG. In the example of illustration, it is arrange | positioned from the range including the area | region corresponding to the blood-extraction part H to the area | region corresponding to a perineal part. The high resilience sheet member 20 is preferably disposed in the area surrounded by the central pressing groove 16 formed on both sides of the area corresponding to the blood outlet H as shown in FIG. .

  The high-restorable sheet member 20 is, in a state of being contracted in a bellows-like manner, each surface by a hot melt adhesive applied by spiral coating or the like to both or one of the outer surface of the upper layer sheet material 21 and the outer surface of the lower layer sheet material 22. It is preferable to fix the

  The high resilience sheet member 20 is formed in a substantially rectangular shape in a plan view in a state of being contracted in a bellows shape by the elastic stretchable member 23 as shown in FIG.

  The planar dimension of the high-restoration sheet member 20 is such that the dimension A in the width direction of the napkin is 20 mm to 20 mm in the state of being contracted in the bellows shape by the contraction force by the elastic stretchable member 23 (state shown in FIG. 5 (B)). 50 mm, preferably 35 mm to 45 mm. In addition, the dimension B in the longitudinal direction of the napkin is preferably 50 mm to 420 mm, and it is preferable to provide at least a length of 70 mm to 150 mm in a region corresponding to the drainage port H.

  The apparent thickness of the highly recoverable sheet member 20 in the bellows-like contraction due to the contraction of the elastic stretchable member 23 varies depending on the material and basis weight of the upper layer sheet material 21 and the lower layer sheet material 22, It may be 2 mm to 10 mm, preferably 4 mm to 8 mm.

  The high resilience sheet member 20 is, as shown in FIG. 2 and FIG. 4, an envelope 4 covering the skin side of the absorber 4 when the absorber 4 is surrounded by the envelope sheet 5. And the liquid-permeable top sheet 3. When the second sheet 6 is interposed between the liquid-permeable top sheet 3 and the absorber 4 as in this example, it is preferable to dispose the second sheet 6 between the absorber 4 and the second sheet 6. , And may be disposed between the second sheet 6 and the liquid-permeable top sheet 3.

  In the sanitary napkin 1 having the above configuration, the high restorability sheet member 20 deformed in a bellows shape by the contraction force by the elastic stretchable member 23 is interposed between the absorbent body 4 and the liquid permeable surface sheet 3. The cushioning property is given between the absorber 4 and the liquid-permeable surface sheet 3 by utilizing the restoring force of the high-restoration sheet member 20 contracted in a bellows-like manner, and the surface material is applied to the skin surface. I am trying to make it adhere. Therefore, as in the conventional absorbent articles, only the liquid-permeable top sheet is not expanded to the skin side. Even if it is, the integrity of the liquid-permeable surface sheet 3 and the absorber 4 is not impaired, and the liquid-permeable surface sheet 3 is less likely to be warped or wrinkled.

  Further, as shown in FIG. 6, even if the skin side of the absorbent body 4 in the vicinity of the drainage port H or the like is depressed due to the absorber 4 repeatedly absorbing the body fluid, the high restorability can be obtained. The cushioning property of the sheet member 20 can prevent the generation of a gap between the absorber 4 and the liquid-permeable surface sheet 3, and the liquid-permeable surface sheet 3 is kept in close contact with the skin surface. Since the body fluid travels along the liquid-permeable top sheet 3 and the high restorability sheet member 20 and is quickly absorbed by the absorber 4, leakage of the body fluid can be prevented.

  In order to exert the cushioning property of the high recoverability sheet member 20 more effectively, the high recoverability sheet member 20 is in the thickness direction by the tension acting on the liquid permeable surface sheet 3 when the central compressed groove 16 is provided. It is preferable to be in a slightly compressed state. As a result, even when the absorbent body 4 repeatedly absorbs body fluid, even if healing occurs, the highly recoverable sheet member 20 is restored from the compressed state in the thickness direction, so the highly recoverable sheet member 20 is an absorbent body. By filling the hollow portion due to the looseness of 4, the depression of the liquid-permeable surface sheet 3 is suppressed, and the adhesion with the skin surface is enhanced. The compression rate (the reduction rate of the apparent thickness) of the high recoverability sheet member 20 by applying the central compressed groove 16 is preferably 3% to 50%, and more preferably 5% to 20%.

  By the way, as shown in FIG. 1, the high-restorable sheet member 20 is formed in a bellows-like shape in which asperities are repeated in the longitudinal direction of the napkin by arranging the elastic stretchable member 23 along the longitudinal direction of the napkin. Alternatively, as shown in FIG. 7, by arranging the elastic stretchable member 23 along the napkin width direction, the elastic stretch member 23 may be formed in a bellows shape in which the unevenness is repeated in the napkin width direction. When the elastic stretchable member 23 is disposed along the former longitudinal direction of the napkin, the accordion-like folds are formed along the widthwise direction of the napkin, which facilitates along the roundness of the body in the longitudinal direction. When the elastic stretchable member 23 is disposed along the latter napkin width direction, the bellows-like folds are formed along the napkin longitudinal direction, so the effect of suppressing the body fluid diffusion in the napkin width direction is enhanced. However, the resilience of the highly recoverable sheet member 20 does not change between the case where the elastic stretch member 23 is disposed in the longitudinal direction of the napkin and the case where the elastic stretch member 23 is disposed in the width direction of the napkin. There is no change in

  A polymer layer or a pulp layer may be separately provided between the upper layer sheet material 21 and the elastic stretchable member 23 or between the lower layer sheet material 22 and the elastic stretchable member 23. Thereby, the absorption performance in the high resilience sheet member 20 can also be improved.

In order to confirm the effect of the sanitary napkin 1, the following test was performed.

  In Table 1, “double” after “thread rubber” in the column of the middle layer is an extension ratio when the natural state in which the elastic stretchable member (thread rubber) is not stretched is 0 times.

  In the fifth test method, when 3 cc of artificial menstrual blood (viscosity 8) at 37 ° C is absorbed at the same position at intervals of 3 minutes, artificial menstrual blood on the surface is completely absorbed from the start of the fifth drop. Measure the time (seconds) until it is visually confirmed that it has been done with a stopwatch.

The test method for the amount of reversion is to absorb 3 cc of artificial menstrual blood (viscosity 8) at 37 ° C at the same position at intervals of 3 minutes, and after 1 minute, put 4 sheets of filter paper at the dropping position and load 5 g / cm ² (bottom size When 100 mm × 40 mm, height 40 mm, weight 200 g) is placed for 5 minutes, the weight of the artificial menstrual blood absorbed by the filter paper is measured.

  The test method of apparent thickness of a sheet member measures thickness of each sheet member using Ozaki Mfg. Co., Ltd. make, peacock, constant-pressure thickness measuring device digital type FFD-7.

The test method of the density of the sheet member is obtained from [weight (g) of sheet member / (thickness (cm) × area (cm ² ))]. In Tables 1 and 2, those with the symbol "-" are those that were not measured.

The method for testing the surface setting rate is the product thickness (mm) after the above-mentioned absorption speed test for the fifth time and the test for the reversion amount, and the product thickness before the test (mm), and calculated from the following formula Value. It should be noted that the smaller the numerical value of the surface setting rate, the smaller the surface setting due to the absorption of the body fluid by the absorber.
Product thickness (mm) / product thickness before test (mm) x 100 (%) after the above-mentioned absorption speed test of the 5th test and reverse amount test
The test method for the amount of dummy absorption is as follows: (1) Wear a sanitary napkin on a dummy doll, inject 5 cc of artificial menstrual blood in the supine posture, and then stand still for 5 minutes on the supine → right sideways for 5 minutes. (2) Return the dummy doll to the supine posture, inject 5 cc of artificial menstrual blood again, and then stand still for 5 minutes on the supine → left sideways for 5 minutes. Repeat the above procedures (1) and (2) until leakage occurs, and measure the amount of absorption. In Tables 1 and 2, those with the symbol "-" are those that were not measured.

The components of the artificial menstrual blood are: 12.30% by weight of glycerin, 85.18% by weight of ion exchanged water, 0.45% by weight of CMC (sodium carboxymethylcellulose), 0.97% by weight of NaCl (sodium chloride), Na ₂ CO 3 ₃ (sodium carbonate) 1.04% by weight, blue powder 0.06% by weight.

  As compared with Comparative Example 1 and Examples 1 to 7, the sanitary napkin 1 provided with the high-restoration sheet member 20 has an absorption speed increased by 1.56 seconds to 5.44 seconds and the surface is fixed. The rate can be improved by 1% to 17%. In addition, Comparative Example 2 in which the tension of the thread rubber is arranged at 0 times (a natural state in which the rubber is not stretched) has an absorption speed 2.06 seconds to 2.79 seconds slower than in Examples 1 to 3, and nothing is arranged. The surface settling rate can not be improved as compared with Comparative Example 1 in which no surface contact was made. Thereby, it has been confirmed that the absorption speed and the surface sagging rate can be improved by arranging the high restorability sheet member 20 formed in a bellows shape by the contraction force by the elastic stretchable member 23.

  When Examples 1 to 3 are compared, when the tension (elongation ratio) of the thread rubber (elastic stretch member 23) is increased, bellows-like wrinkles are finely formed, and the unit area of the upper layer sheet material 21 and the lower layer sheet material 22 As the surface area is increased, the absorption rate is increased and the surface is less likely to stagnate. However, when the tension of the thread rubber becomes 3.5 times (Example 2) or 4.5 times (Example 3), the bellows-like wrinkles of the high-restorable sheet member 20 become finer, and Blood builds up and the amount of reversion increases. Therefore, although depending on the material and basis weight of the upper layer sheet material 21 and the lower layer sheet material 22, the tension of the thread rubber is preferably 1 to 3.5 times in the case of air through (25 gsm).

  Next, comparison is made with materials of the upper layer sheet material 21 and the lower layer sheet material 22. Although the upper layer sheet material 21 and the lower layer sheet material 22 are changed from air through (25 gsm) to SMMS (10 gsm) in Example 2 and Example 6, the thickness of the upper layer sheet material 21 and the lower layer sheet material 22 is thin Then, the gap between the bellows-like folds of the high-restoration sheet member 20 becomes small and dense, so that the absorption speed in the sixth example is 3.44 seconds slower, and the SMMS itself absorbs and retains the artificial menstrual blood As a result, in Example 6, the amount of reversion was increased by 0.025 g.

  On the other hand, in Example 5 in which the upper layer sheet material 21 is an air through nonwoven fabric and the lower layer sheet material 22 is an SMMS, the suction force that draws in the artificial menstrual blood absorbed by air through the SMMS having a small gap between fibers acts. Compared with 2, the absorption speed was almost equal, and the result that the amount of reversion was improved by 0.147 g was obtained. Therefore, it is preferable to use an air through non-woven fabric as the upper layer sheet material 21 and to use SMMS as the lower layer sheet material 22.

  In Comparative Example 3, an absorbent made of pulp and polymer formed to have a thickness substantially equal to the apparent thickness of Example 1 is disposed instead of the high restorability sheet member 20. The rate is high, and repeated absorption of the body fluid creates a gap between the surface material and the skin surface, resulting in fluid leakage.

  Further, in Comparative Example 4, instead of the high resilience sheet member 20, a high basis weight air through non-woven fabric is disposed. In this case, the absorption speed is about 1.8 as compared with Examples 1 to 3. It is slow by seconds to 2.5 seconds, and the surface setting rate also deteriorates by 5 to 11%.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid impermeable back sheet, 3 ... Liquid permeable surface sheet, 4 ... Absorber, 5 ... Encapsulation sheet, 6 ... Second sheet, 7 ... Side nonwoven fabric, 20 .. High restoration sheet Member 21 upper layer sheet material 22 lower layer sheet material 23 elastic elastic member 24 hydrophilic non-woven fabric 25 absorbent member

Claims (2)

In an absorbent article in which an absorbent is interposed between a liquid-permeable top sheet and a back sheet,
Between the absorbent body and the liquid-permeable topsheet, a direction orthogonal by Rukoto deflated like bellows by thread resilient and elastic members in the direction of arrangement of the resilient and elastic members, crease fold projects into the skin side And a high-restorable sheet member provided with a large number of folds in which creases and folds protrude to the non-skin side are alternately formed, and the high-restoration sheet member is made of non-woven fabric or mesh sheet A plurality of the thread-like elastic stretchable members between the upper layer sheet material and the lower layer sheet material in a predetermined direction at intervals and in an extended state,
The high-restorable sheet member is characterized in that the folds of the folds are formed along the width direction of the absorbent article by arranging the thread-like elastic stretch members along the longitudinal direction of the absorbent article. And absorbent articles.   The absorbent article according to claim 1, wherein the highly recoverable sheet member is disposed in a range including a region corresponding to a body fluid discharge site.

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