JP6604883B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as disposable diapers, urine pads, incontinence pads, and more specifically, comprising an absorbent body composed of pulp fibers and a superabsorbent polymer, and a blending ratio of the pulp fibers and superabsorbent polymer. The present invention also relates to an absorbent article in which body fluid is diffused over a wide range by forming a plurality of regions in which the basis weight of the superabsorbent polymer is changed.

  Conventionally, as the absorbent article, an absorbent body is interposed between a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet. It has been known.

  The absorbent article is a vertically long absorbent body that is formed so that the dimension in the front-rear direction is relatively longer than the width direction so as to continuously cover the range from the abdomen to the back through the wearer's crotch. I have. However, the diffusion range of the bodily fluid absorbed by the absorber is often a relatively narrow range around the urination port-corresponding region and its periphery, and even if it is wider than this, the surface is liquidated depending on the posture of the wearer during urination. It flows to a range from the urination opening corresponding area to the crotch area.

  In a conventional absorbent article, a desired absorption-absorbent is prepared by blending pulp fibers having a high absorption rate but poor absorption ability and a superabsorbent polymer having high absorption ability but low absorption rate at a predetermined blending ratio. Developments were made to obtain absorption capacity and absorption rate. However, if the amount of the superabsorbent polymer is increased too much, the absorption rate becomes slow, and the superabsorbent polymer absorbs water and swells, resulting in gel blocking that makes it difficult for adjacent superabsorbent polymers to join and to pass water. When the ratio of pulp fibers is increased too much, the amount of body fluid that can be retained is reduced and leakage tends to occur, and the absorbed body fluid tends to return to the surface, resulting in poor absorbability. For this reason, in the conventional absorbent article, measures were taken to cover the slow absorption speed and low absorption capacity by separately arranging members other than the absorber.

  When the body fluid absorption capacity of the absorbent body reaches the limit, the body fluid that has been absorbed into the absorbent body may leak body fluid, in particular, leak from the narrow width direction (lateral leakage), or once it has been absorbed by the absorbent body Caused the body fluid to ooze out to the surface side, causing discomfort to the wearer.

  In order to solve such a problem, various techniques for improving the diffusibility of body fluid so that the body fluid diffuses over a wide range of the absorber have been proposed. For example, in Patent Document 1 below, a liquid diffusion sheet is disposed between an absorber and a liquid-impermeable sheet, and the absorber includes pulp fibers and a water-absorbing polymer, and the absorption. When the cross section in the thickness direction of the body is divided into five equal parts in the thickness direction, the water absorption rate in which the volume ratio of the water absorbent polymer contained is set to the highest with respect to the volume of the water absorbent polymer contained in the entire absorbent body A polymer high-body laminate and a water-absorbent polymer low-body laminate in which the volume ratio of the water-absorbing polymer contained is lower than that of the water-absorbing polymer high-body laminate, and is at least the first liquid-impermeable sheet side. An absorbent article is disclosed in which the layer is a superabsorbent polymer body laminate.

  Further, in the following Patent Document 2, the absorber includes an absorber disposed between the top sheet and the back sheet, and a diffusion portion disposed between the absorber and the top sheet. The diffusion portion includes a diffusion layer and a diffusion layer. An absorbent article provided with an upper absorbent layer, the upper absorbent layer being provided at a position facing the rear portion of the diffusion layer between the diffusion layer and the top sheet is disclosed. According to such an absorbent article, the body fluid excreted from the wearer can be guided to a wide range of the absorbent body through the diffusion layer, and the upper absorbent layer allows moisture on the absorbent side to be worn by the wearer in the rear part. The effect that it can suppress returning to the side is described.

JP2015-66382A Japanese Patent Laying-Open No. 2015-167724

  In the absorbent article described in Patent Document 1, the content ratio of the water-absorbing polymer on the liquid-impermeable sheet side where the liquid diffusion sheet is disposed is changed by changing the blending ratio of the super-absorbent polymer in the thickness direction of the absorber. By increasing the amount of the liquid permeable sheet more than the liquid permeable sheet side, the liquid absorption amount on the liquid impermeable sheet side is increased compared with the liquid absorption amount on the liquid diffusive sheet side, and the excretory liquid of the liquid diffusion sheet is diffused. However, since it is blended almost uniformly with respect to the planar direction of the absorbent body, the diffusion direction in the skin side layer cannot be controlled, and lateral leakage occurs due to the body fluid diffused in the width direction. There was a fear. In addition, the skin side layer has a lower percentage of superabsorbent polymer, and there are many pulp fibers with weak absorption capacity, so the absorption capacity of the skin side layer of the absorber is likely to reach the limit, and the body fluid on the skin surface It was easy for reversion to occur.

  Moreover, in the absorbent article described in Patent Document 2, the number of members is increased by the amount of the diffusion portion arranged between the absorber and the top sheet, and the structure becomes complicated, so that it is not suitable for mass production. Since the superabsorbent polymer is also blended in the diffusion part, the superabsorbent polymer is likely to drop off in the production line, and there are manufacturing problems such as poor handling in the production process.

  Therefore, a main problem of the present invention is to provide an absorbent article that prevents side leakage by quickly diffusing body fluid in the longitudinal direction of the absorbent body, reduces reversal of body fluid, and is easy to manufacture.

In order to solve the above problems, in the present invention according to claim 1, in an absorbent article comprising an absorbent body composed of pulp fibers and a superabsorbent polymer,
The absorber is adjacent to a urination port corresponding region including a urination port portion and the vicinity thereof, at least a front side and a rear side of the urination port corresponding region, and an outer edge of the absorber and an outer edge of the urination port corresponding region. An intermediate region extending to an intermediate position therebetween, and an outer region adjacent to at least the outside of the intermediate region and extending to the outer edge of the absorber,
The ratio of the superabsorbent polymer to the pulp fiber has a relationship of the urination port corresponding region <the intermediate region <the outer region, and the basis weight of the superabsorbent polymer is the urination port corresponding region <the intermediate region. <The absorbent article characterized by having the relationship of the said outside area | region is provided.

  In the invention of claim 1, the absorber is adjacent to at least the front side and the rear side of the urination port corresponding region including the urination port portion of the wearer and the vicinity thereof, and the absorber. An intermediate region extending to an intermediate position between the outer edge of the urination port-corresponding region and an outer region adjacent to at least the outer side of the intermediate region and extending to the outer edge of the absorber. In the absorbent body, the ratio of the superabsorbent polymer to the pulp fiber has a relationship of urination port corresponding region <intermediate region <outer region, and the basis weight of the superabsorbent polymer is urination port corresponding region <intermediate region. <It has the relationship of an outer side area | region. For this reason, immediately after urination, body fluid is quickly absorbed into the urination port corresponding region disposed in the urination port of the wearer, and the body fluid overflowing from the urination port corresponding region is higher in the pulp fiber than the urination port corresponding region. The ratio of the water-absorbing polymer is relatively high, and the superabsorbent polymer moves to the intermediate region formed with a relatively high basis weight, and diffuses in this region. Since the intermediate region is formed up to an intermediate position between the outer edge of the absorbent body and the outer edge of the urination port corresponding region adjacent to at least the front side and the rear side of the urination port corresponding region, the body fluid is absorbent. The vertical diffusion toward the front side and the rear side of the body is promoted, and side leakage of body fluid can be prevented. Further, the intermediate region is formed with a relatively low ratio of the superabsorbent polymer to the pulp fiber and the basis weight of the superabsorbent polymer as compared with the outer region, and as a result, the pulp fiber Since it is arranged with a high basis weight, the density difference of the pulp fibers prevents the body fluid from moving from the intermediate region to the outer region, and the body fluid easily diffuses in the intermediate region. This pulp fiber density difference is provided throughout the absorbent article so that the pulp fiber gradually decreases in density toward the outer region through the intermediate region from the urination port corresponding region. Due to the density difference of the fibers, the body fluid is more easily diffused in the inner region than the body fluid moves from the region close to the urination port of the wearer to the outside. The body fluid that has diffused in the intermediate region moves to the outer region so as to overflow from the intermediate region. This outer region has the highest ratio of superabsorbent polymer to pulp fiber and the highest basis weight of superabsorbent polymer, so that body fluid is reliably absorbed and retained in this outer region, and leakage to the outside and reversal of body fluid are reduced. it can.

  In addition, the present absorbent article solves the above problems by adjusting the blending ratio of the pulp fibers and the superabsorbent polymer constituting each region of the absorbent body, so compared with the case where another member is provided. Manufacturing can be simplified.

  As the present invention according to claim 2, the intermediate region is defined in a plurality of regions from the region adjacent to the urination port corresponding region toward the outer edge side of the absorber, the ratio of the superabsorbent polymer to the pulp fiber The absorbent article according to claim 1, wherein the basis weight of the superabsorbent polymer is formed so as to gradually increase from an area adjacent to the urination opening corresponding area toward an outer edge side of the absorbent body. .

  In the invention according to claim 2, when the intermediate region is defined in a plurality of regions from the region adjacent to the urination port corresponding region toward the outer edge side of the absorber, the superabsorbent polymer for the pulp fiber The ratio and the basis weight of the superabsorbent polymer are formed so as to gradually increase from the region adjacent to the urination port corresponding region toward the outer edge side of the absorber. Thereby, the absorption retention of the body fluid which diffuses toward the outer edge side of the absorber from the region adjacent to the urination port corresponding region in the intermediate region can be further improved.

  As the present invention according to claim 3, there is provided an absorbent article according to any one of claims 1 and 2, wherein the urination opening corresponding region does not contain the superabsorbent polymer.

  In the third aspect of the invention, since the superabsorbent region does not contain a superabsorbent polymer, the first urination causes the pulp fibers constituting the urinator port corresponding region to fall and the surface to drop. On the other hand, in the middle region and the outer region, the highly water-absorbing polymer absorbs water and swells, and therefore becomes bulky. As a result, during urination for the second time and thereafter, after body fluid is temporarily stored in the gap portion between the surface of the urination port corresponding area that has fallen due to the first water absorption and the skin surface, Be absorbed into the area. As described above, since a temporary body fluid storage space is formed, it is possible to prevent side leakage and reversal even by multiple urinations.

  As described above in detail, according to the present invention, body fluid can be quickly diffused in the longitudinal direction of the absorbent body, thereby preventing side leakage, reducing backflow of body fluid, and facilitating manufacture.

It is a partially broken developed view of the absorbent article 1 according to the present invention. It is the II-II arrow directional view of FIG. It is a top view of absorber 2 concerning the 1st form example. It is a top view of the absorber 2 which concerns on a 2nd form example. It is a top view of the absorber 2 which concerns on a 3rd form example.

[Basic composition of absorbent article]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this document, “longitudinal direction” means a direction connecting the front side and the rear side of the absorbent article 1, and “width direction” means a direction orthogonal to the longitudinal direction (left and right direction when the absorbent article 1 is unfolded). means.

  As shown in FIGS. 1 and 2, the absorbent article 1 is composed of pulp fibers and a highly water-absorbing polymer, and has a certain degree of rigidity, for example, an approximately hourglass shape. A liquid-permeable material comprising an absorbent body 2 surrounded by an encapsulating sheet and a perforated or non-porous nonwoven fabric or a perforated plastic sheet disposed so as to cover the skin side (surface side) of the absorbent body 2 It is mainly comprised from the water-resistant waterproof sheet | seat 4 which consists of polyethylene etc. arrange | positioned so that the non-skin side of the said absorber 2 may be covered. In addition, the top sheet 3 and the waterproof sheet 4 that extend outward from the outer edge of the absorbent body 2 around the absorbent body 2 are joined by an adhesive such as hot melt, heat seal, ultrasonic seal, or the like. The outer periphery flap part in which the absorber 2 does not exist is formed on the outer periphery.

  The absorbent body 2 is preferably made of fluffed pulp and a superabsorbent polymer. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. When providing an encapsulating sheet that surrounds the absorbent body 2, the encapsulating sheet is consequently interposed between the top sheet 3 and the absorbent body 2, and by using an encapsulating sheet having excellent absorbency, The body fluid is diffused quickly and the urine is prevented from returning.

  The superabsorbent polymer is mixed in the pulp constituting the absorber 2 as, for example, granular powder. Examples of the superabsorbent polymer include a cross-linked polyacrylate, a self-crosslinked polyacrylate, a saponified acrylate-vinyl acetate copolymer cross-linked product, a cross-linked isobutylene / maleic anhydride copolymer, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process, the superabsorbent polymer having the water-absorbing performance can be adjusted in absorption capacity (water-absorbing power) and absorption rate by adjusting the crosslinking density and the crosslinking density gradient.

  In the illustrated example, the absorbent body 2 is formed in a substantially hourglass shape in the illustrated example, and by narrowing the width of the absorbent body at the crotch, the contact with the crotch portion is weakened, and the wearer feels irritated. However, it is also possible to use one that is shaped as a substantially rectangular shape. The absorbent body 2 is preferably encapsulated by an encapsulating sheet in order to maintain the shape and improve the diffusibility of body fluid that has passed through the top sheet 3.

  As the liquid-permeable top sheet 3 that covers the skin side (upper layer side) of the absorbent body 2, the liquid-permeable top sheet 3 has a property of transmitting liquid, and for example, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferable. Used. The material fiber which comprises a nonwoven fabric is not specifically limited. For example, in addition to synthetic fibers such as polyethylene or polypropylene such as olefin, polyester, and polyamide, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers in which two or more of these are used, Examples include composite fibers, and the use of nonwoven fabrics obtained by appropriate processing methods such as the spunlace method, the spunbond method, the thermal bond method, the melt blown method, the needle punch method, the air-through method, and the point bond method. it can. Among these processing methods, the spunlace method is excellent in flexibility and the spunbond method is excellent in drapeability, and the thermal bond method, the pointbond method and the air-through method are bulky and have high compressibility (= softness). Is excellent. The top sheet 3 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. When a large number of through holes are formed in the liquid permeable top sheet 3, urine and the like are quickly absorbed, and the dry touch property is excellent. The non-woven fiber may be either a long fiber or a short fiber, but preferably a short fiber is used in order to give a towel texture. In order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can be suitably used.

  Although the waterproof sheet 4 which covers the non-skin side (lower layer side) of the said absorber 2 is not specifically limited, For example, the plastic film which consists of olefin resin etc., such as polyethylene or a polypropylene, or a plastic film on the surface of a nonwoven fabric A laminated nonwoven fabric provided with a laminated sheet, a laminated sheet obtained by laminating a nonwoven fabric on a plastic film and the like can be exemplified, but in recent years, a material having moisture permeability is preferably used from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility. In addition, non-woven fabric using microdenier fiber, enhancement of leakproofness by reducing the voids of the fiber by applying heat or pressure, application of superabsorbent resin or hydrophobic resin or water repellent Accordingly, a sheet that is liquid-impermeable without using a plastic film can also be used. The outer edge of the waterproof sheet 4 substantially coincides with the outer edge of the absorbent article 1.

[Absorber 2]
Hereinafter, the absorber 2 will be described in more detail.

  As shown in FIG. 1, the absorbent body 2 is adjacent to the urination port corresponding region 10 including the urination port portion of the wearer and the vicinity thereof, at least the front side and the rear side of the urination port corresponding region 10, and An intermediate region 11 extending to an intermediate position between the outer edge of the absorber 2 and the outer edge of the urination port corresponding region 10, and an outer region 12 adjacent to at least the outer side of the intermediate region 11 and extending to the outer edge of the absorber 2. And have.

  In the absorbent body 2, the ratio of the superabsorbent polymer to the pulp fiber has the relationship of the urination port corresponding region 10 <intermediate region 11 <the outer region 12, and the basis weight of the superabsorbent polymer corresponds to the urination port. It is formed so as to have a relationship of region 10 <intermediate region 11 <outer region 12.

  For this reason, immediately after urination, body fluid is quickly absorbed into the urination port corresponding region 10 corresponding to the urination port of the wearer, and the body fluid overflowing from the urination port corresponding region 10 is pulp fiber from the urination port corresponding region 10. The ratio of the superabsorbent polymer to the water is relatively high, and the superabsorbent polymer is transferred to the intermediate region 11 where the basis weight of the superabsorbent polymer is relatively high, and diffuses in the intermediate region 11. Since the intermediate region 11 is formed up to an intermediate position between the outer edge of the absorbent body 2 adjacent to at least the front side and the rear side of the urination port corresponding region 10 and the outer edge of the urination port corresponding region 10, the body fluid is absorbed. Longitudinal diffusion toward the front side and the rear side of the property article 1 is promoted, so that side leakage of body fluid can be prevented. Further, the intermediate region 11 is formed with a relatively low ratio of the superabsorbent polymer to the pulp fiber and a relatively low basis weight of the superabsorbent polymer as compared with the outer region 12, and as a result, the pulp Since the fibers are arranged with a high basis weight, the difference in density of the pulp fibers prevents body fluid from moving from the intermediate region to the outer region, and facilitates diffusion of the body fluid in the intermediate region.

  The body fluid that has diffused through the intermediate region 11 moves to the outer region 12 so as to overflow from the intermediate region 11. In the outer region 12, the ratio of the superabsorbent polymer to the pulp fiber is the highest, and the basis weight of the superabsorbent polymer is the highest, so that the body fluid is reliably absorbed and retained in the outer region 12. Reversal can be reduced.

  Moreover, since this absorbent article 1 solves the said subject by adjusting the mixture ratio of the pulp fiber which comprises each area | region of the absorber 2, and a super absorbent polymer, when arrange | positioning another member, etc. Compared to the above, the manufacturing can be simplified.

  As described above, the ratio of the superabsorbent polymer to the pulp fibers gradually decreases from the urination opening corresponding region 10 to the outer region 12 through the intermediate region 11, and the basis weight of the superabsorbent polymer gradually decreases. As a result, the outer area has a relatively low basis weight of the pulp fiber, so that the body fluid is transferred from the area close to the urination port of the wearer to the outer area due to the density difference of the pulp fiber. The body fluid is more easily diffused in the inner region than the transition. For this reason, longitudinal diffusion of body fluid is promoted.

  The urination port corresponding region 10 is a region including a portion where the wearer's urination port portion abuts and the vicinity thereof when the absorbent article 1 is worn, and the width direction center closer to the front side than the longitudinal center portion of the absorbent body 2. Located in the department. The planar shape of the urination opening corresponding region 10 is preferably a vertically long shape in the longitudinal direction of the absorbent article 1, and specifically, the length in the longitudinal direction of the absorbent article 1 is 20 to 90 mm, particularly 40 to 40 mm. A substantially rectangular shape having a width of 60 mm and a width of 10 to 35 mm, particularly 15 to 25 mm is preferable.

  It is preferable that the urination outlet corresponding region 10 does not contain a superabsorbent polymer and is composed only of pulp fibers. Since the urination mouth corresponding area 10 does not contain the superabsorbent polymer, the pulp fiber constituting the urination mouth corresponding area 10 is deformed so that the surface falls due to the first urination, while the intermediate area 11 and the outer side In the region 12, the highly water-absorbing polymer absorbs water and swells, so that it becomes bulky. Thereby, at the time of urination for the second time and thereafter, after body fluid is temporarily stored in the gap portion between the surface of the urination opening corresponding area 10 and the skin surface that has fallen due to the first water absorption, the urination opening corresponding area 10 and the intermediate region 11 are absorbed. As described above, since a temporary body fluid storage space is formed, it is possible to prevent side leakage and reversal even by multiple urinations.

  In the urination port corresponding region 10, the ratio (weight ratio) of the superabsorbent polymer to the pulp fiber is 0 to 0.05, preferably 0 to 0.01. When the ratio of the superabsorbent polymer to the pulp fibers is larger than 0.05, the ratio of the pulp fibers becomes too small and the body fluid is difficult to absorb quickly, and a liquid flow that is transmitted along the surface of the absorbent article 1 is likely to occur. Gel blocking of the superabsorbent polymer is likely to occur, making it difficult to absorb water after the second time.

The basis weight of the superabsorbent polymer is 0 to 50 g / m ² , preferably 0 to 10 g / m ² , and more preferably, the superabsorbent polymer is not blended as described above.

The basis weight of the pulp fiber is 300 to 1700 g / m ² , preferably 800 to 1200 g / m ² . The total basis weight of the pulp fiber and the superabsorbent polymer is 300 to 1700 g / m ² , preferably 800 to 1200 g / m ² .

  The intermediate region 11 is provided adjacent to the front side and the rear side of the urination port corresponding region 10. When the intermediate region 11 is provided only on the front side and the rear side of the urination port corresponding region 10, an outer region 12 is provided adjacent to both sides of the urination port corresponding region 10 (FIGS. 3 and 4). When the intermediate region 11 is provided so as to surround the urination port corresponding region 10, the intermediate region 11 is provided adjacent to both sides of the urination port corresponding region 10 (FIG. 5).

  The intermediate region 11 is adjacent to at least the front side and the rear side of the urination port corresponding region 10 and extends to an intermediate position between the outer edge of the absorber 2 and the outer edge of the urination port corresponding region 10. It is an area that does not reach. The intermediate region 11 extends to the front side and the rear side of the urination port corresponding region 10 to a position where the separation length from the front end and the rear end of the absorber 2 is substantially equal. Accordingly, when the urination port corresponding region 10 is provided at a position closer to the front side, the intermediate region 11 has a length extending to the rear side of the urination port corresponding region 10 than a length extending to the front side of the urination port corresponding region 10. The length is longer.

  The intermediate region 11 is preferably formed in a range of 50 to 90%, preferably 60 to 80% with respect to the entire length of the absorber 2. As a result, the body fluid absorbed in the intermediate region 11 can be diffused over a wide range before and after the absorber 2. Specifically, the longitudinal dimension of the intermediate region 11 is preferably about 100 to 500 mm, particularly about 200 to 300 mm. The longitudinal dimension of the intermediate region 11 is the distance between the front end and the rear end of the intermediate region 11 in the longitudinal direction of the absorbent article 1, and as shown in FIG. In the same manner, when the urination port corresponding region 10 is provided separately before and after the urination port corresponding region 10, the length in the longitudinal direction of the absorbent article 1 between the frontmost end portion and the rearmost end portion of the intermediate region 11 is similarly determined. It is what I took. The width dimension is preferably the same width as the urination opening corresponding area 10 or 10 to 80 mm, particularly about 15 to 60 mm wider than the urination opening corresponding area 10.

  The intermediate region 11 is formed separately on the front and rear sides of the urination port corresponding region 10 so as to extend only to the front side and the rear side of the urination port corresponding region 10, and does not exist on both sides of the urination port corresponding region 10. Alternatively, it may be formed so as to surround the outer periphery of the urination port corresponding region 10 (see a first embodiment (FIG. 3) and a second embodiment (FIG. 4) described later). Refer to FIG.

The ratio (weight ratio) of the superabsorbent polymer to the pulp fibers in the intermediate region 11 is 0.2 to 1.0, preferably 0.2 to 0.7. The basis weight of the superabsorbent polymer is 25 to 100 g / m ² , preferably 70 to 90 g / m ² . Further, the total basis weight of the pulp fiber and the superabsorbent polymer is 120 to 600 g / m ² , preferably 200 to 400 g / m ² .

  The outer region 12 is a region disposed on the outer peripheral portion of the remaining absorbent body 2 excluding the urination port corresponding region 10 and the intermediate region 11. The outer region 12 exists so as to surround the urination port corresponding region 10 and the intermediate region 11.

The ratio (weight ratio) of the superabsorbent polymer to the pulp fibers in the outer region 12 is 1.0 to 2.0, preferably 1.0 to 1.5. The basis weight of the superabsorbent polymer is 100 to 300 g / m ² , preferably 170 to 230 g / m ² . Furthermore, the total basis weight of the pulp fiber and the superabsorbent polymer is 200 to 400 g / m ² , preferably 200 to 360 g / m ² .

  In any region, the pulp fiber and the superabsorbent polymer are provided almost uniformly in the thickness direction of the absorbent body 2. The absorber 2 is formed with a substantially uniform thickness over the entire surface before use.

  Hereinafter, more specific embodiments of the absorber 2 will be described.

[First embodiment]
As shown in FIG. 3, the absorbent body 2 according to the first embodiment includes a urination port corresponding region 10 including a urination port portion of the wearer and the vicinity thereof, and a front side and a rear side of the urination port corresponding region 10. An intermediate region 11 that is adjacent and extends to an intermediate position in the longitudinal direction of the absorbent body 2 and an outer region 12 that is adjacent to the outside of the intermediate region 11 and the urination port corresponding region 10 and extends to the outer edge of the absorbent body 2. is doing.

  The intermediate region 11 is disposed separately before and after the urination port corresponding region 10 and is not formed on both sides of the urination port corresponding region 10. The intermediate region 11 is formed to be substantially equal in width to the urination opening corresponding region 10. Thus, the intermediate region 11 is adjacent to the front and rear of the urination port corresponding region 10, and the outer region 12 is adjacent to both sides of the urination port corresponding region 10.

  At this time, it is preferable that the basis weight of the pulp fiber is formed in the relationship of the urination port corresponding region 10> the intermediate region 11> the outer region 12. Thereby, the body fluid absorbed in the urination opening corresponding region 10 moves so as to overflow into the adjacent intermediate region 11 and the outer region 12, but the ratio of the superabsorbent polymer to the pulp fiber is higher in the intermediate region 11. Since it is smaller than the region 12, it becomes easier to pass water and more easily diffuse in the longitudinal direction of the absorbent article 1 along the intermediate region 11 than to move from the intermediate region 11 to the outer region 12.

[Second embodiment]
As shown in FIG. 4, the absorbent body 2 according to the second embodiment includes a urination port corresponding region 10 including a urination port portion of the wearer and the vicinity thereof, and a front side and a rear side of the urination port corresponding region 10. An intermediate region 11 that is adjacent and extends to an intermediate position in the longitudinal direction of the absorbent body 2 and an outer region 12 that is adjacent to the outside of the intermediate region 11 and the urination port corresponding region 10 and extends to the outer edge of the absorbent body 2. is doing. The intermediate region 11 is formed so as to gradually widen from the urination opening corresponding region 10 toward the front side and the rear side. The intermediate region 11 is formed to gradually widen forward and backward, so that when the body fluid transferred from the urination port corresponding region 10 diffuses forward and backward, the diffusion range expands in the width direction and proceeds in the longitudinal direction. Therefore, it becomes easy to longitudinally diffuse body fluid. The expansion ratio of the intermediate region 11 is preferably about 1.2 to 2.0 times the ratio of the width of the boundary with the urination port corresponding region 10 and the width of the front and rear ends.

  For the same reason as in the first embodiment, it is preferable that the basis weight of the pulp fiber is formed in the relationship of the urination opening corresponding area 10> the intermediate area 11> the outer area 12.

[Third embodiment]
As shown in FIG. 5, the absorbent body 2 according to the third embodiment is adjacent to the urination port corresponding region 10 including the urination port portion of the wearer and the vicinity thereof, and the periphery of the urination port corresponding region 10. The intermediate region 11 extends to an intermediate position in the longitudinal direction and the width direction of the absorber 2, and the outer region 12 is adjacent to the outside of the intermediate region 11 and extends to the outer edge of the absorber 2. The intermediate region 11 has a closed pattern surrounding the urination opening corresponding region 10. Thereby, the inner side of the intermediate region 11 is adjacent to the urination port corresponding region 10 over the entire circumference, and the outer side of the intermediate region 11 is adjacent to the outer region 12 over the entire periphery. That is, the intermediate region 11 is always interposed between the urination opening corresponding region 10 and the outer region 12.

  The intermediate region 11 may be composed of a single region, or as shown in FIG. 5, the intermediate region 11 may be divided into a plurality of regions from the region adjacent to the urination opening corresponding region 10 toward the outer edge side of the absorber. You may make it be made. In the example shown in FIG. 5, two regions are defined which are an inner intermediate region 11 a adjacent to the outside of the urination opening corresponding region 10 and an outer intermediate region 11 b adjacent to the outer side. Thus, the intermediate region 11 defined in a plurality of regions has a ratio of the superabsorbent polymer to the pulp fiber and the basis weight of the superabsorbent polymer from the region adjacent to the urination port corresponding region 10 to the outer edge side of the absorber. It can form so that it may become large gradually toward it. Thereby, the absorption retention of the body fluid which diffuses toward the outer edge side of an absorber from the area | region adjacent to the urination opening corresponding | compatible area | region 10 in the intermediate | middle area | region 11 can further be improved now.

  Moreover, when the said intermediate | middle area | region 11 is demarcated into several area | regions, the intermediate | middle area | region 11 is so that the fabric weight of a pulp fiber may become small gradually toward the outer area | region from the inner area | region near a wearer's urination opening part. Can be formed. That is, the fabric weight of the pulp fiber can be made smaller in the outer intermediate region 11b than in the inner intermediate region 11a. This makes it easier for the body fluid to diffuse in the inner intermediate region 11a due to the capillary action of the pulp fibers than when the body fluid moves from the inner intermediate region 11a to the outer intermediate region 11b due to the density difference of the pulp fibers, and more reliably the body fluid Longitudinal diffusion is promoted. Also in this case, it is preferable to form so that the basis weight of the pulp fibers gradually decreases from the urination opening corresponding region 10 through the intermediate region 11 to the outer region 12.

A water absorption experiment was performed using the absorbent body 2 (Example) according to the first embodiment and a conventional absorbent body (Comparative Example) in which pulp fibers and a superabsorbent polymer were uniformly blended throughout. . In the water absorption experiment, each absorbent body was encapsulated with crepe paper having a basis weight of 16.5 g / m ² , and a cylindrical injection tube having a diameter of 25 mm and a height of 100 mm was placed at a position corresponding to the urination port of each absorbent body. The upright tube is placed upright so that the center of the circle at one end is in a position corresponding to the urination port of the absorber, and the blue one is placed on the 50 cc artificial urine maintained at about 37 ° C. from the other end. When 0.001 g of color was added and colored three times every 30 minutes, the diffusion distance and area of the artificial urine after 30 minutes were measured. The diffusion distance was measured by measuring the maximum length in the longitudinal direction of the absorber in which the artificial urine was diffused. The diffusion area was obtained by taking the surface of the absorber as image data into a computer, binarizing it, and calculating it as a black / white ratio, and determining the ratio (%) to the area (0.043 m ² ) of the absorber. Table 1 shows the blending amount of the pulp fiber and the superabsorbent polymer and the area of each region.

  The composition of the artificial urine is 2 wt% urea, 0.8 wt% sodium chloride, 0.03 wt% calcium chloride dihydrate, 0.08 wt% magnesium sulfate heptahydrate, and 97.09 wt% ion-exchanged water. Used.

＊１ 比較例の領域１は、実施例の排尿口対応領域１０に対応する領域である。
＊２ 比較例の領域２は、実施例の中間領域１１に対応する領域である。
＊３ 比較例の領域３は、実施例の外側領域１２に対応する領域である。

* 1 The region 1 of the comparative example is a region corresponding to the urination opening corresponding region 10 of the example.
* 2 The region 2 of the comparative example is a region corresponding to the intermediate region 11 of the example.
* 3 Region 3 of the comparative example is a region corresponding to the outer region 12 of the example.

  DESCRIPTION OF SYMBOLS 1 ... Absorbent article, 2 ... Absorber, 3 ... Top sheet, 4 ... Waterproof sheet, 10 ... Area for urination, 11 ... Middle area, 12 ... Outer area

Claims (3)

In an absorbent article comprising an absorbent body composed of pulp fibers and a superabsorbent polymer,
The absorber is adjacent to a urination port corresponding region including a urination port portion and the vicinity thereof, at least a front side and a rear side of the urination port corresponding region, and an outer edge of the absorber and an outer edge of the urination port corresponding region. An intermediate region extending to an intermediate position therebetween, and an outer region adjacent to at least the outside of the intermediate region and extending to the outer edge of the absorber,
The ratio of the superabsorbent polymer to the pulp fiber has a relationship of the urination port corresponding region <the intermediate region <the outer region, and the basis weight of the superabsorbent polymer is the urination port corresponding region <the intermediate region. <Absorptive article characterized by having a relationship of the outer region.   The intermediate region is defined in a plurality of regions from the region adjacent to the urination port corresponding region to the outer edge side of the absorbent body, and the ratio of the superabsorbent polymer to the pulp fiber and the basis weight of the superabsorbent polymer are determined. The absorbent article according to claim 1, wherein the absorbent article is formed so as to gradually increase from an area adjacent to the urination opening corresponding area toward an outer edge side of the absorbent body.   The absorptive article according to claim 1 or 2 in which said superabsorbent polymer is not contained in said urination mouth corresponding field.

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