JP4145288B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper having a clean appearance when worn and having excellent leakage prevention performance.

  As an absorbent article such as a disposable diaper for preventing the side leakage of excrement such as urine, for example, the absorbent core has a laminated structure, and at least one of them is widely formed and extended from the left and right side edges of other layers. By forming a plurality of cut portions at appropriate intervals in the body fluid-absorbing article (see Patent Document 1) in which the extending portions are flaps having a propensity to stand out and the long side portion of the napkin body Further, there is a sanitary napkin (see Patent Document 2) in which a deformable part that is easily deformed is formed in the middle part of the long side part.

  However, the absorbent articles disclosed in Patent Documents 1 and 2 have a large crotch bump in the worn state and exhibit a muddy appearance. When such an absorbent article is worn, it is difficult to move the foot, and the position of the diaper is likely to shift due to the movement of the wearer, so that leakage is likely to occur. In addition, if the crotch part is loose, it becomes difficult to wear a trousers or other outerwear on the diaper, and even if the outerwear can be worn somehow, the appearance is not good.

  It is known that it is effective to reduce the width of the absorbent body in the crotch part in order to eliminate bumps in the crotch part and improve the fit in the crotch part. However, an absorber with a narrow width of the crotch has a low absorption power because the width of the absorber at the crotch is substantially narrow, and does not absorb excrement such as urine in a portion where the absorber does not exist. Therefore, leakage at the crotch part is likely to occur. In order to prevent leakage at the crotch part, it is conceivable to increase the amount of the absorbing polymer in the crotch part. With such a configuration, the appearance and fit immediately after wearing are good, but urine is absorbed. The appearance of the crotch after the swelling is excessively swollen due to the swelling of a large amount of polymer, and it cannot be said that it is good.

  Thus, various techniques for achieving both fit at the crotch and leakage prevention have been proposed. For example, the absorbent body includes a first absorbent body having a narrow width at the crotch portion and a pair of second absorbents provided at positions away from the first absorbent body on both sides of the narrowed portion. A disposable diaper in which a first absorbent body and a pair of second absorbent bodies are connected by a hydrophilic sheet has been proposed (see Patent Document 3).

Moreover, the diaper which made the absorber located in the width direction both sides of a diaper stand up among the absorbers divided into three by the crotch part is also proposed. For example, the absorbent body includes a first absorbent body whose width is narrowed at the crotch portion, and a pair of second absorbent bodies provided at positions away from the first absorbent body on both sides of the narrowed portion. Furthermore, solid gathers are disposed on both sides in the longitudinal direction opposite to the first absorbent body of the second absorbent body, and the second absorbent body is spaced apart from the outermost layer sheet together with the solid gathers. A disposable diaper that stands on the side of the absorber has been proposed (see Patent Document 4). Further, the first absorbent body which is positioned flat in the central portion along the longitudinal direction of the diaper, and the first absorbent body is disposed on both sides of the first absorbent body so as to be spaced at least partially. There has been proposed a disposable diaper comprising a second absorbent body, an elastic body attached to the upper part of the second absorbent body, and a standing tendency and gathers being imparted to the second absorbent body ( (See Patent Document 5).
Japanese Utility Model Publication No. 6-75445 Japanese Utility Model Publication No. 61-171919 Japanese Patent Publication No. 7-28892 Japanese Patent Laid-Open No. 10-5274 Japanese Patent No. 2884355

  The absorbent article having the absorbent body divided into three at the crotch part as disclosed in Patent Documents 3 to 5 is lower than the absorbent article disclosed in Patent Documents 1 and 2. Although there is an area where the absorber does not exist at the crotch, there is anxiety about leakage prevention performance and liquid return performance, and manufacturing an absorbent body divided into three at the crotch at high speed is excellent. It requires very advanced technology.

  Therefore, the object of the present invention is that the appearance at the time of wearing is clear, and it has excellent fit, leakage prevention and liquid return at the crotch, and provides such fit, leakage prevention and liquid return. It is providing the disposable diaper which comprises the absorptive core suitable for making it easy and stably.

  The present invention relates to a disposable diaper having an absorbent main body having a topsheet and an absorbent core, wherein the absorbent main body is configured such that both side portions of the crotch stand upright on both sides of the absorbent main body. A leak-proof cuff comprising a leak-proof cuff forming sheet joined to the absorbent main body and an elastic member fixed to the leak-proof cuff forming sheet, and the absorbent core has a central absorption And a pair of side absorbers provided on both sides of the center of the central absorbent body, and a front side portion and a rear side portion of each of the pair of side absorbent bodies are respectively constricted and notched. The side absorbent body achieves the object by providing a disposable diaper disposed at least in the crotch part.

  Since the disposable diaper of the present invention is particularly characterized by the form of the absorbent core, the crotch part does not bump in the worn state, the appearance of the diaper is clean, the fit property in the crotch part, the leak-proof property and Excellent liquid return and excellent processability during production.

Hereinafter, the present invention will be described based on a preferred embodiment thereof with reference to the drawings.
The disposable diaper 1 of the first embodiment (hereinafter referred to as diaper 1) is a so-called pants-type diaper, and as shown in FIGS. 1 and 2, a liquid-permeable topsheet 2 and a liquid-retaining absorbent core. 4 and an exterior body 10 on the non-skin contact surface side of the absorbent body 5. The diaper 1 is divided into an abdominal side A disposed on the wearer's abdomen, a back side B disposed on the back of the wearer, and a crotch C positioned therebetween. The ventral portion A, the back portion B, and the crotch portion C are in a longitudinal direction (FIG. 2) in a diaper that is expanded and stretched (a state in which the elastic member of each portion is stretched and expanded in a flat shape, as shown in FIG. 2). In the vertical direction) is divided into three regions so as to be divided into approximately three equal parts.

In addition, in this specification, the "non-skin contact surface side" is the side arranged on the opposite side to the wearer's skin side during wearing, among the front and back sides (surfaces) of each member such as the absorbent main body. (Surface). In addition, hereinafter, the term “skin contact surface side” may be used, and this is the side (surface) that is arranged on the skin side of the wearer when wearing, out of the front and back sides (surface) of each member. It is.
The “longitudinal direction” is a direction parallel to the long side of each member. Hereinafter, the phrase “width direction” may be used, which is a direction orthogonal to the longitudinal direction.

The absorptive main body 5 has a vertically long rectangular shape, and a known joint such as a hot-melt adhesive is used so that its longitudinal direction coincides with the longitudinal direction of the diaper and extends from the abdominal side A to the back side B. It is joined to the central portion in the width direction of the exterior body 10 by means. The exterior body 10 is configured such that both side edges of the portion located on the ventral side A and both side edges of the portion located on the back side B are connected to each other by known joining means such as heat sealing, high frequency sealing, and ultrasonic sealing. It joins and a pair of side seal part is formed by this. Moreover, the waist opening part 7 and a pair of leg opening parts 8 and 8 are formed in the diaper 1 by the joining.
The above-mentioned structure of the diaper 1 of 1st Embodiment is the same as that of a conventionally well-known diaper.

  In the diaper 1 of 1st Embodiment, as shown in FIG. 2, the side part (specifically, it mentions later) over the full length of the both-sides edge part of the longitudinal direction of the said absorbent core 4. As shown in FIG. The side absorbent body 42) is provided with an elastic member 9 for starting up, whereby the absorbent main body 5 has both sides 52, 52 (side absorbent bodies 42) in the crotch C as shown in FIG. 42) stands up. Moreover, it is preferable that the both-sides edge part of the longitudinal direction of the said absorptive core 4 is formed in the both-sides part 52 in the crotch part C substantially linearly.

  Leak-proof cuffs 6 and 6 are formed on both sides of the absorbent main body 5. The leak-proof cuff 6 includes a leak-proof cuff forming sheet 60 joined to the absorbent main body 5 and an elastic member 61 fixed to the leak-proof cuff forming sheet in an expanded state.

  Below, the absorptive core 4 in the diaper 1 of 1st Embodiment is explained in full detail. As shown in FIG. 1 to FIG. 3, particularly FIG. 3, the absorbent core 4 has a vertically long rectangular plan view shape along the longitudinal direction of the diaper as a whole. It is covered with a water-permeable covering sheet (not shown) made of a water-permeable nonwoven fabric.

  The absorbent core 4 includes an hourglass-shaped central absorbent body 41 and a pair of side absorbent bodies 42, 42 that are preferably provided symmetrically on both sides of the central absorbent body 41, Constricted notches 43f and 43f 'are provided in front of the front side portions of the pair of side absorbers 42 and 42, respectively, and constricted notched portions 43r and 43r' are provided in the rear of the rear side portions, respectively. It has been. All of the constricted cutout portions have similar shapes, preferably the same shape and substantially the same size.

  In the first embodiment, the central absorbent body 41 includes a substantially hourglass-shaped upper absorbent body 411 and a lower absorbent body 412 larger than the upper absorbent body 411. The upper absorbent body 411 is composed of the lower absorbent body. 412 is overlapped on the skin contact surface side over the front part F and the central part M. The pair of side absorbers 42 and 42 are provided integrally with the lower absorber 412. In the state where the upper absorbent body 411 and the lower absorbent body 412 are superposed in this way, the length d of the portion of the lower absorbent body 412 that protrudes from the edge of the upper absorbent body 411 is preferably 0 to 20 mm, More preferably, it is 5-15 mm. By arranging the lower absorbent body 412 and the upper absorbent body 411 in the state of being overlapped in the vicinity of the urination point in this manner, the total amount of the water-absorbing polymer and pulp in the vicinity of the urine point is not increased so much. It is possible to increase the utilization efficiency of the water-absorbing polymer and pulp, and it is possible to realize good leakage prevention performance.

  As shown in FIG. 2, the absorbent core 4 is disposed on the diaper 1 so that the side absorbent bodies 42 and 42 are disposed at least on the crotch portion C. In the first embodiment, the absorbent core 4 includes side absorbers 42 and 42 arranged on the crotch C, and an overlapping portion (the central absorber) of the upper absorber 411 and the lower absorber 412. 41 is arranged so that the front part F) is located on the ventral side A of the diaper. In addition, the front part F, the center part M, and the rear part R are each area | region when it divides into three area | regions so that the full length of the longitudinal direction may be divided into about 3 equally in the absorptive core 4 of the state shown in FIG. is there.

Polymer basis weight of the upper absorber 411 is preferably 80~230g / m ^2, still preferably from 100 to 200 g / m ^2, the pulp basis weight, preferably 80~230g / m ^2, more preferably 100 ˜200 g / m ² . The polymer basis weight and pulp basis weight of the lower absorbent body 412 are also preferably the same as those of the upper absorbent body 411, respectively. When the polymer basis weight and pulp basis weight of each of the absorbent bodies 411 and 412 are less than the above lower limits, there is a possibility that a problem arises in leakage prevention performance, and molding cannot be performed in a stable state in terms of processing performance. On the contrary, if the polymer basis weight and pulp basis weight of each absorber 411, 412 exceeds the above upper limit, respectively, there is a problem in the fit property at the time of wearing, the absorber excessively swells in the crotch after urination, There is a risk of discomfort to the wearer.

In any of the upper absorbent body 411 and the lower absorbent body 412, the weight ratio of the polymer to the pulp is preferably 4: 6 to 6: 4 in consideration of the mixed state of the pulp and the polymer.
In addition, considering the appearance of the crotch after absorption of liquid (preventing the feeling of swelling due to polymer swelling), the total value of the polymer basis weight of the upper absorbent body 411 and the polymer basis weight of the lower absorbent body 412 is 160. It is preferably ˜400 g / m ² .

  The length (full length) L1 of the central absorbent body 41 is preferably 300 to 500 mm, more preferably 350 to 450 mm. Further, the width W1 of the central absorbent body 41 [the width of the portion where the width of the central absorbent body 41 is maximized (maximum width)] is preferably 80 to 170 mm, and more preferably 100 to 150 mm. In 1st Embodiment, the maximum width in each of the front part F of the center absorber 41, the center part M, and the back part R is the same, and the width W1 here exists in these each part.

  The side absorber 42 has a length (full length) L2 of preferably 50 to 250 mm, more preferably 100 to 200 mm. If the length L2 is less than 50 mm, the leakage prevention performance at the crotch may be lowered, and if it exceeds 250 mm, the appearance at the time of wearing, particularly the clean feeling of the crotch, may be impaired.

  The constricted notches 43f, 43f ', 43r, and 43r' all have a substantially right triangle shape. The length L3 of the open side of each constricted notch is preferably 20 to 50 mm, more preferably 25 to 45 mm. If this length L3 is less than 20 mm, it is difficult to stand the side part (side absorbent body 42) of the absorbent main body 5, and the appearance when worn, particularly the clean feeling of the crotch, may be impaired. Then, since the width | variety of a center absorber becomes narrow, there exists a possibility that absorption performance may fall and a crotch leak, abdominal leak, etc. may occur.

  The central portion M of the central absorbent body 41 is a portion where the side absorbent bodies 42 and 42 are provided. The distance (the distance between the virtual line a and the virtual line b in FIG. 3)] is preferably 40 to 100 mm, more preferably 50 to 90 mm. The central part M of the central absorbent body 41 is an area arranged in the crotch part C. When the width W2 of the central part M is less than 40 mm, leakage easily occurs particularly in the crotch part. If it exceeds 100 mm, the appearance may be deteriorated and the fit at the crotch may be lowered. The virtual line a is a line connecting the innermost point in the diaper width direction at the constricted notch 43f and the innermost point in the diaper width direction at the constricted notch 43r, and the virtual line b is the constricted line b. This is a line connecting the innermost point in the diaper width direction at the notch part 43f ′ and the innermost point in the diaper width direction at the constricted part 43r ′. “Distance between virtual line a and virtual line b” is a measurement of the distance between the midpoints of the virtual lines.

  Further, between the pair of constricted cutout portions 43f and 43f ′ in front of the front side portions of the pair of side absorbers 42 and 42, and between the pair of constricted cutout portions 43r and 43r ′ in the rear of the rear side portions. The shortest width W3 (the distance between the innermost points in the diaper width direction of each of the pair of constricted notches at the front or the rear) is preferably 40 to 120 mm, and more preferably 50 to 110 mm. In the first embodiment, the shortest width W3 and the width W2 of the central portion M of the central absorbent body 41 have substantially the same dimensions, both of which are the shortest widthwise portions of the central absorbent body 41. Equal to the length of

  Further, the width W4 of the pair of side absorbers 42, 42 (the distance between the imaginary line a or b and the outermost portion in the diaper width direction of the side absorber 42) is the total length of the side absorber 42, respectively. The thickness is preferably 20 to 50 mm, more preferably 25 to 45 mm. If this width W4 is less than 20 mm, the appearance when worn, particularly the cleanness of the crotch, may be impaired, and the function as a side absorber may not be sufficiently exhibited. If it exceeds 50 mm, the side absorbers 42, 42 may be There is a risk that adverse effects such as giving a sense of incongruity when standing up and entering the wearer's bearded part may occur.

  The width (W2 + W4 × 2) of the central portion M (the portion disposed on the crotch portion C) of the absorbent core 4 is larger than the shortest width W3 and at the front portion F or the rear portion R of the absorbent core 4 It is preferable that it is the same as the maximum width or smaller than the maximum width in consideration of the absorption performance at the crotch part and the appearance (clean feeling).

  The diaper 1 of 1st Embodiment is a pants-type disposable diaper using the absorptive core 4 shown in FIG. 3, and each structure other than the absorptive core 4 mentioned above in this diaper 1 is as explained in full detail below. It is.

  In the diaper 1 of 1st Embodiment, as shown in FIG.4 and FIG.5, the said surface sheet 2 is the skin contact surface 4a side whole area of the said absorptive core 4, and the width direction both sides of this absorptive core 4 Covers the entire area of the edges 4b, 4b, covers the vicinity of both sides in the width direction of the absorbent core 4 on the non-skin contact surface 4c side, and leaks cuffs at both end portions 21, 21 of the topsheet 2 The fixing members 67 and 67 are formed by being bonded and fixed to the forming sheet 60 by a bonding means such as a hot-melt adhesive. The shape of the joint fixing portion 67 is not particularly limited, and for example, a straight line that is continuous along the longitudinal direction of the absorbent main body 5, a discontinuous straight line having intermittent portions in some places, or a continuous or discontinuous curve. And the like.

  Moreover, in the diaper 1 of 1st Embodiment, as shown in FIG.4 and FIG.5, the liquid-impermeable back surface sheet 3 is joined to the skin contact surface side of the said exterior body 10, and this back surface sheet 3 is attached. The leakage-proof cuff forming sheet 60 and the absorbent main body 5 are sequentially joined to the skin contact surface side. For joining these members, joining means such as a hot-melt adhesive can be used. The back sheet 3 has a vertically long rectangular shape having substantially the same dimensions as the absorbent main body 5, and the longitudinal direction thereof is the same position as the absorbent main body 5 (the central portion in the width direction of the exterior body 10) in the longitudinal direction of the diaper. It is arranged to match.

  And as shown in FIG.4 and FIG.5, the said absorptive main body 5 is the said absorption body over the whole longitudinal direction of this absorptive main body 5 in the center part of the diaper width direction of the non-skin contact surface side. The core 4 has an uncovered portion 51 that is not covered with the top sheet 2, and the leak-proof cuff forming sheet 60 is not disposed on a portion corresponding to the uncovered portion 51.

  The exterior body 10 will be described. The exterior body 10 includes two sheets 11 and 12 and elastic members at respective portions fixed between the two sheets as shown in FIGS. It consists of. Between the two sheets 11 and 12, a waist elastic member 71 that forms a waist gather at the peripheral edge of the waist opening 7, and a leg elastic member that forms a leg gather at the peripheral edge of the leg opening 8 81, and a waistline elastic member forming a waistline gather in a state where the waistline part D is divided into a waistline part D which is a region from a position spaced 20 mm downward from the peripheral edge of the waist opening 7 to the upper end of the leg opening 8 91 are bonded and fixed in a stretched state by a bonding means such as a hot-melt adhesive.

  The sheet 11 and the sheet 12 are both made of a breathable nonwoven fabric. Of these two sheets, the sheet 11 positioned on the non-skin contact surface side extends in the longitudinal direction from the front and rear end edges (both end edges in the longitudinal direction) of the sheet 12 positioned on the skin contact surface side. After the absorbent main body 5 is disposed on the sheet 12 of the exterior body 10, these extended portions have front and rear ends (both ends in the longitudinal direction). ) Is folded back and bonded to the absorbent main body 5 side.

  The leak-proof cuff 6 will be described. The leak-proof cuff 6 extends in the longitudinal direction of the diaper on both sides in the longitudinal direction of the absorbent main body 5 as shown in FIGS. 2, 4 and 5. The leakage prevention cuff forming sheet 60 and a plurality of the elastic members 61 are provided. In the diaper 1 of the first embodiment, as the leak-proof cuff forming sheet 60, one strip-shaped water-repellent sheet having a predetermined width is folded in two along a fold line along its longitudinal direction, and the opposing layers are separated. A hot-melt adhesive or a sheet having a two-layer structure joined by partial heat or ultrasonic sealing is used. The plurality of elastic members 61 are fixed in an expanded state between the layers of the two-layer structure sheet.

  The leakproof cuff forming sheet 60 is formed on the abdominal side A and the back side B, and more specifically, the absorbent main body 5 is attached to the skin at both longitudinal ends of the absorbent main body 5. Covering from the contact surface side to the non-skin contact surface side, heat seal, high-frequency seal on the skin contact surface side of the absorbent main body 5 at each of the longitudinal ends of the absorbent main body 5 They are joined by known joining means such as an ultrasonic seal and a hot melt adhesive (see FIG. 4).

  The leak-proof cuff 6 can stand up at least at the crotch part C as shown in FIG. A plurality of the elastic members 61 are fixed to the free end of the leak-proof cuff 6 in a state of being arranged in the width direction of the absorbent main body 5. With such a configuration, the tip end portion of the standing leak-proof cuff 6 comes into surface contact with the wearer's skin, and as a result, the adhesion to the body of the diaper is improved and the leak-proof property is improved, and the diaper is removed. It is possible to gently contact the skin.

As a material which comprises each part of the diaper 1 of 1st Embodiment, what is normally used in the said technical field can be especially used without a restriction | limiting.
For example, as the surface sheet 2, a hydrophilic and liquid-permeable nonwoven fabric or an apertured film can be used. As the back sheet 3, a liquid-impermeable material or a water-repellent material can be used. As the liquid-impermeable material, a resin film, a laminate material of a resin film and a nonwoven fabric, or the like can be used. As the water-repellent material, a water-repellent nonwoven fabric or the like can be used. As the water-repellent nonwoven fabric, a nonwoven fabric described later as a leak-proof cuff forming sheet can be used.

  As the water-absorbent core 4, a fiber aggregate made of pulp fibers or the like, or a fiber aggregate and a water-absorbent polymer (mixed product of water-absorbent polymer and fiber material) can be used. Examples of water-absorbing polymers include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride) copolymer. Examples thereof include a polymer and a saponified product thereof, and polyaspartic acid. Examples of the fibers constituting the absorbent core 4 include hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate, polyolefin fibers such as polyethylene and polypropylene, and condensation fibers such as polyester and polyamide. I can. The water-absorbing polymer and the fiber can be used alone or in combination of two or more.

As the sheet 60 for forming a leak-proof cuff, a composite nonwoven fabric having a multilayer structure composed of spunbond, meltblown, spunbond, etc., a spunbond nonwoven fabric, a heat bond nonwoven fabric, an air-through nonwoven fabric, etc. can be used, and flexibility, water resistance, etc. from the viewpoint of nonwoven fabric is preferably a multilayer structure composed of spunbond and meltblown basis weight about 12 g / m ² is preferred.

  The sheet for forming a leak-proof cuff preferably has a water pressure of 3 cm or more, more preferably measured according to a water resistance test (low water pressure method) in the waterproof test method for textile products of JIS L1092 (1998). 5 cm or more. When measuring the water pressure resistance, the level device filled with water was raised at a speed of 10 ± 0.5 cm / min, and it was visually observed that water came out from three places on the back side of the test piece. Measure the water level at the time. In addition, it will measure without delay when the installation of the test piece is completed.

  As the form of the elastic member 61 for forming the leak-proof cuff, a thread-like member (thread rubber or the like), a belt-like member having a predetermined width (flat rubber or the like) or the like is preferable, and a thread-like member is particularly preferable. Examples of the material of the elastic member 61 include natural rubber, synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, EVA, stretchable polyolefin, urethane, and the like. Moreover, as a form of the elastic members 9, 71, 81, 91, a thread-like member, a belt-like member having a predetermined width, a thin-film member, or the like can be used. As those materials, those described as the materials of the elastic member 61 can be used.

  According to the diaper 1 of 1st Embodiment, as mentioned above, since the said absorptive core 4 which has a characteristic form is used, a crotch part does not bump in a wearing condition, and the external appearance of a diaper is neat. Excellent fit and leakage prevention at the crotch. That is, with such a configuration, as shown in FIG. 5, a concave pocket is easily formed in the crotch part C by the absorbent main body 5 having front and rear, left and right rising parts, and excrement from the pocket Even when a large amount of urine is excreted in a short time, or when watery stool or loose stool that is difficult to absorb is excreted, excrement is difficult to leak out of the pocket. Even when excrement leaks from the pocket, the leak-proof cuff 6 is present on both sides of the absorbent main body 5, the side portion 52 of the absorbent main body 5 rising, the leak-proof cuff forming sheet 60, Since the pocket P excellent in excrement retention is formed during the period, the excrement can be prevented from leaking beyond the side edge of the outer package 10. Moreover, since the leak-proof cuff 6 is in surface contact with the wearer's skin and the standing side portion 52 of the absorbent main body 5 is less likely to be in direct contact with the wearer's skin, it is difficult to feel discomfort when worn. .

  Moreover, in the diaper 1 of 1st Embodiment, the absorption capacity | capacitance of the said absorptive core 4 is located by positioning the overlapping part of the said upper absorber 411 and the said lower absorber 412 in the belly (front) side of a diaper. Since it is unevenly distributed on the ventral side, it is particularly excellent in preventing leakage from the ventral side. Can be prevented. Furthermore, another advantage of the present embodiment is that the side absorber 42 is coupled to the central absorber 41 (not separated). In the form in which the side absorbent body and the central absorbent body are completely separated at the crotch (forms outside the scope of the present invention), urine excreted in the vicinity of the central absorbent body is not smoothly diffused into the side absorbent body, May cause leakage. Further, in this embodiment, even if no leakage occurs, there is a region between the central absorber and the side absorber that does not have a means for absorbing liquid, so liquid return occurs in that region. This will cause discomfort to the wearer. On the other hand, in the present embodiment, since the central absorbent body and the side absorbent body are coupled at the crotch, the above does not occur. Further, in the form in which the central absorbent body and the side absorbent body are simply joined (forms outside the scope of the present invention), the side absorbent body generally has poor uprightness. Comparing the basis weight of the body and the central absorber, the basis weight of the side absorber is smaller than the basis weight of the central absorber, and there is a difference in basis weight at the boundary line between the side absorber and the central absorber. Good uprightness of the side absorber can also be achieved.

  Moreover, in the diaper 1 of 1st Embodiment, the liquid impervious back surface sheet 3 is joined to the skin contact surface side of the body exterior body 10, and the non-skin contact surface of the side absorbent body 42 Since the side is covered with the liquid-permeable surface sheet 2, the liquid can be absorbed from the non-skin contact surface side of the side absorbent body 42, which is particularly excellent in leakage prevention. In addition, when the back sheet 3 is printed with various patterns or a manufacturer's brand mark or the like, the back sheet 3 is disposed adjacent to the exterior body 10, so that the outside of the printed pattern is There is also a merit that visibility of is increased.

Below, 2nd-4th embodiment of this invention is described. In addition, the description of 1st Embodiment mentioned above is applied to the location which abbreviate | omitted description in each following embodiment. Both the second embodiment shown in FIG. 6 and the fourth embodiment shown in FIG. 10 are reference examples.

  FIG. 6 is a view corresponding to FIG. 5 in the second embodiment of the present invention. This 2nd Embodiment is comprised similarly to 1st Embodiment mentioned above except the point from which the arrangement | positioning site | part of the said back surface sheet 3 differs. That is, in 2nd Embodiment, the said absorptive main body 5 has the said liquid-impermeable back sheet 3 which coat | covers the whole region by the side of the non-skin contact surface 4c of the said absorbent core 4, This back sheet 3 Is sandwiched and fixed between the absorbent core 4 and the top sheet 2 covering the vicinity of both sides in the width direction of the absorbent core 4 on the non-skin contact surface 4c side.

7 and 8 are plan views of other embodiments of the absorbent core, respectively.
The absorbent core shown in FIG. 7 is configured in the same manner as in the first embodiment except that the pair of side absorbers 42 and 42 are provided integrally with the upper absorber 411.
The absorbent core 4 ′ shown in FIG. 8 is obtained by integrally providing a pair of side absorbers on the central absorber having a single layer structure, and the central absorber is formed only from the lower absorber 412 described above. Except for the point formed, it is comprised similarly to 1st Embodiment.

  FIG. 9 is a diagram corresponding to FIG. 5 in the third embodiment of the present invention, and FIG. 10 is a diagram corresponding to FIG. 5 in the fourth embodiment of the present invention. The third embodiment is configured in the same manner as the first embodiment described above except that the absorbent core 4 ′ shown in FIG. 8 is used. The fourth embodiment is configured in the same manner as the second embodiment described above except that the absorbent core 4 'is used.

As mentioned above, although 1st-4th embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above, A various change is possible in the range which does not deviate from the meaning of this invention.
For example, in the first embodiment described above, the central absorbent body 41 is formed from the upper absorbent body 411 and the lower absorbent body 412 which are independent members, and the upper absorbent body 411 and the lower absorbent body 412 are formed. However, the central absorbent body according to the present invention may be formed by integrating the upper absorbent body and the lower absorbent body (inseparable). In this case, the shape of the central absorbent body is preferably a shape formed by overlapping the upper absorbent body 411 and the lower absorbent body 412 as described above without being deformed, and each part of the central absorbent body. Is preferably as described above. In addition, about the basic weight of this center absorber, the total value of the basic weight of the upper absorber 411 mentioned above and the basic weight of the lower absorber 412 is preferable.

  In the first embodiment described above, the absorbent core 4 is arranged so that the overlapping portion of the upper absorbent body 411 and the lower absorbent body 412 is located on the ventral side A. In the present invention, conversely, the overlapping portion may be arranged so as to be positioned on the back side portion B.

  Further, in the first embodiment described above, the elastic members 9 for raising the side portions of the absorbent main body 5 are arranged on both sides of the absorbent core 4. A part is not specifically limited, For example, between the absorptive core 4 and the surface sheet 2 located in the skin contact surface side, or the inside of the said covering sheet (not shown) which coat | covers the absorptive core 4 whole etc. Can also be arranged. However, from the viewpoint of causing both side portions 52, 52 of the absorbent main body 5 to stand largely toward the wearer's skin in the crotch part C, the elastic member 9 is provided on both side edges of the absorbent core 4 or its edges. It is preferable to arrange in the vicinity.

  Moreover, although the diaper of 1st Embodiment mentioned above was a pants-type disposable diaper, the disposable diaper of this invention may be what is called a deployment-type disposable diaper provided with the fastening tape for diaper fastening. good.

It is a perspective view of the underpants type diaper as a 1st embodiment of the present invention. FIG. 2 is a plan view illustrating a state in which the diaper illustrated in FIG. 1 is separated and expanded by a side seal portion, and a state in which an elastic member of each portion is expanded and expanded in a planar shape is partially broken. It is a top view of the absorptive core in the diaper shown in FIG. FIG. 3 is a cross-sectional view schematically showing a cross section taken along line II of FIG. 2. It is a cross-sectional view which shows typically the II-II line | wire cross section of FIG. 2 in a diaper use state. FIG. 6 is a view corresponding to FIG. 5 in a second embodiment of the present invention. It is a top view of other embodiments of an absorptive core concerning the present invention. It is a top view of another embodiment of an absorptive core concerning the present invention. FIG. 9 is a view corresponding to FIG. 5 in the diaper of the third embodiment of the present invention using the absorbent core shown in FIG. 8. FIG. 9 is a view corresponding to FIG. 5 in the diaper of the fourth embodiment of the present invention using the absorbent core shown in FIG. 8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4,4 'Absorbent core 41 Central absorber 411 Upper absorber 412 Lower absorber 42 Side absorber 43 Constriction notch part 5 Absorbent main body 6 Leak-proof cuff 60 Leak-proof cuff formation Sheet 61 Elastic member for forming a leak-proof cuff 67 Joint fixing part 9 Elastic member 10 for starting up the side part (side absorber) of the absorbent main body Exterior body A Abdominal side part B Back side part C Crotch part F Front part M Center part R Rear part

Claims (11)

In a disposable diaper comprising an absorbent main body having a topsheet and an absorbent core,
The absorbent main body is configured such that both sides of the crotch stand upright,
On both sides of the absorbent main body, a leak-proof cuff comprising a leak-proof cuff forming sheet joined to the absorbent main body and an elastic member fixed to the leak-proof cuff forming sheet is formed,
Provided with an exterior body on the non-skin contact surface side of the absorbent main body, a liquid-impermeable back sheet is bonded to the skin contact surface side of the exterior body, and on the skin contact surface side of the back sheet The leak-proof cuff forming sheet and the absorbent main body are sequentially joined,
The absorbent core includes a central absorbent body and a pair of side absorbent bodies provided on both sides of the central absorbent body, and the front and rear side portions of the front side parts of the pair of side absorbent bodies. Each side is provided with a constricted notch, and the side absorbent body is disposed at least in the crotch part ,
In use, a concave pocket is formed in the crotch part by the absorbent main body having rising parts in the front, rear, left and right, and between the side part of the absorbent main body and the leak-proof cuff forming sheet. In addition, disposable diapers in which pockets with excellent excrement retention are formed.   The central absorbent body is composed of an upper absorbent body and a lower absorbent body, and the upper absorbent body is overlapped on the skin contact surface side over the front part or the rear part and the central part of the lower absorbent body. The disposable diaper according to claim 1, wherein the pair of side absorbent bodies are provided integrally with the lower absorbent body.   The central absorbent body is composed of an upper absorbent body and a lower absorbent body, and the upper absorbent body is overlapped on the skin contact surface side over the front part or the rear part and the central part of the lower absorbent body. The disposable diaper according to claim 1, wherein the pair of side absorbent bodies are provided integrally with the upper absorbent body.   The disposable diaper according to claim 2 or 3, wherein the absorbent core is disposed such that an overlapping portion of the upper absorbent body and the lower absorbent body is located on a ventral side portion of the diaper.   The central absorbent body has a length of 300 to 500 mm and a width of 80 to 170 mm, the side absorbent body has a length of 50 to 250 mm, and each of the constricted cutout portions has a substantially right triangle shape. The disposable diaper according to any one of claims 1 to 4, wherein an open side of each cutout portion has a length of 30 to 120 mm.   The central portion of the central absorbent body is a portion where the side absorbent body is provided, the width thereof is 40 to 100 mm, and the width of the pair of side absorbent bodies is 20 to 50 mm over the entire length, The disposable diaper according to claim 5, wherein the shortest width between the pair of constricted cutout portions at the front of the front side portion and the rear of the rear side portion of each of the pair of side absorbers is 40 to 120 mm.   The disposable diaper in any one of Claims 1-6 by which the elastic member for the side part raising of the said absorptive main body is distribute | arranged over the whole both-sides edge part of the said absorptive core.   The surface sheet covers the entire area of the absorbent core on the skin contact surface side and the entire area of both edges in the width direction of the absorbent core, and both widthwise sides of the absorbent core on the non-skin contact surface side. The disposable diaper in any one of Claims 1-7 which coat | covers the part vicinity and is joined and fixed to the said sheet | seat for leak-proof cuff formation in the both-sides edge part of this surface sheet. Before SL absorbent body in the central portion of the diaper width direction of the non-skin contact surface side, it has a non-coated portion to which the absorbent core is not covered with the topsheet,
The disposable diaper according to claim 8, wherein the leak-proof cuff forming sheet is not disposed on a portion corresponding to the non-covered portion. The disposable diaper according to any one of claims 1 to 9, wherein any of the constricted notches has a similar shape . The disposable diaper according to any one of claims 1 to 9, wherein all the constricted notches have the same shape and substantially the same size.