JP6310740B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper for infants or adults.

  Conventionally, various disposable diapers are known, and various contrivances have been made to make it difficult for side leakage such as urine to occur. For example, Patent Document 1 discloses an absorbent article in which an absorbent body having an absorbent core is attached to an exterior body, and the adhesive region between the absorbent body and the exterior body has three or more different lengths in the width direction. Is disclosed. In the absorbent article disclosed in Patent Document 1, by setting the width of the adhesive region finely, the absorbent core or the like can be brought into close contact with the body, and side leakage of urine or the like can be prevented.

Japanese Patent Laid-Open No. 2005-087622

  By the way, since a crotch part is pinched | interposed into a wearer's both legs at the time of wear of a disposable diaper, the absorbent core provided in the crotch part becomes easy to be distorted by the movement of a wearer's both legs. And when an absorptive core is distorted, the fitting property to the crotch of a wearer of an absorptive core falls, and leakage of urine etc. becomes easy to occur. Therefore, in a disposable diaper, it is desirable to prevent distortion of the absorbent core as much as possible. This invention is made | formed in view of the said situation, The objective is to provide the disposable diaper which a distortion of an absorptive core does not occur easily.

  The disposable diaper of the present invention capable of solving the above problems includes an exterior member having a front abdomen, a back portion, and a crotch portion located between them, and a top sheet attached to the crotch portion of the exterior member, A disposable diaper having a backsheet and an absorbent main body having an absorbent core disposed therebetween; the absorbent core includes a front side portion, a front intermediate portion, a central portion and a rear side from the front side in the front-rear direction. It has an intermediate part and a rear side part, the front side part and the rear side part are formed wider than the center part, and the front side intermediate part and the rear side intermediate part are each wide from the center part toward the front side part or the rear side part. The back sheet is fixed to the exterior member and the bonding area, and the bonding area includes a front bonding area formed to overlap the front side part and a rear bonding area formed to overlap the rear side part. And formed between these, front from the center A central adhesive region formed overlapping the intermediate portion and / or the rear intermediate portion; the front adhesive region and the rear adhesive region are formed wider than the central adhesive region; the central adhesive region is the central portion Further, it has a feature in that it extends outward in the width direction and is formed so that the outer edge in the width direction crosses the outer edge in the width direction of the front intermediate portion and / or the rear intermediate portion.

  The disposable diaper of the present invention provides the front intermediate portion of the absorbent core and / or the outer side in the width direction of the central adhesive region by providing the adhesive region between the backsheet of the absorbent main body and the exterior member as described above. A non-adhesive region is formed overlapping the rear intermediate portion. Therefore, even if the absorbent main body receives a force due to the movement of both legs of the wearer and is distorted, the distortion is absorbed in the non-adhesive region, and the absorbent core is hardly distorted. As a result, the fit of the absorbent core to the wearer's crotch increases, and leakage of urine and the like is less likely to occur.

  The non-adhesive region formed to overlap the absorbent core outside the width direction of the central adhesive region is the rear non-adhesive region formed on the rear side of the front non-adhesive region formed on the front side of the absorbent core. Is preferably formed longer in the front-rear direction. In the disposable diaper, the rear side is more easily pressed by the wearer's buttocks than the front side, and the absorbent main body is also easily distorted. Therefore, the distortion of the absorbent core can be more effectively suppressed by forming the rear non-bonded region longer in the front-rear direction than the front non-bonded region.

  The central adhesion region may be divided into a plurality. If the central adhesive area is divided into multiple parts, even if the absorbent main body receives force from both legs of the wearer, the absorbent core is less likely to be distorted in the central part, and fits between the wearer's crotch. Can be increased.

  It is preferable that rising flaps are provided on both sides in the width direction of the top sheet, and that the central adhesive region extends outward in the width direction from the base that becomes the starting point of the rising flaps. If the rising flap is provided in this way, the absorbent main body is less likely to be rolled up at the base of the rising flap, and the rising flap is less likely to fall inward in the width direction. As a result, a space between the left and right rising flaps is secured widely between the wearer's crotch, and it is easy to prevent side leakage of urine and the like.

  When the central adhesive region extends outward in the width direction from the base of the rising flap, the rising flap is formed by folding back side sheets provided on both sides in the width direction of the top sheet, and the side sheet is It is preferable to have a fixed portion joined to the top sheet and an upright portion folded back outward in the width direction from the inner end in the width direction of the fixed portion. If the rising flap is formed in this way, the central adhesive region extends outward in the width direction from the base of the rising flap, so that the absorbent main body is less likely to roll up at the base of the rising flap, and the rising portion It is easy to stand up outward in the width direction without falling down inward in the width direction.

  The exterior member is formed in a pants shape having a waist opening and a pair of leg openings. The exterior member extends along the front edge of the leg opening and crosses the central portion of the absorbent core in the width direction. A front leg elastic member that extends along the rear edge of the leg opening and extends across the center of the absorbent core in the width direction is provided. It is preferable that the rear leg elastic member is provided intermittently at a portion overlapping the central adhesive region and continuously provided at other portions. By providing the leg elastic member in this way, the absorbent core is less likely to be distorted. Moreover, since the contraction force by the leg elastic member extends to the vicinity of the absorbent core, the absorbent core is lifted toward the wearer, and the fit between the wearer's crotch of the absorbent core is enhanced.

  In the disposable diaper of the present invention, the central adhesive region extends outward in the width direction from the central portion of the absorbent core, and the outer edge in the width direction of the central adhesive region is the front intermediate portion of the absorbent core and / or Or since it forms so that the outer edge of the width direction of a back side intermediate part may be crossed, even if an absorptive main body receives force and is distorted by a motion of a wearer's both legs, the distortion will not reach an absorptive core easily. As a result, the fit of the absorbent core to the wearer's crotch increases, and leakage of urine and the like is less likely to occur.

An example of the disposable diaper of this invention is represented, and the perspective view of a disposable underpants type diaper is represented. The top view which looked at the state which unfolded and developed the joint of the front part and back part of the disposable diaper shown in Drawing 1 from the skin side. The top view which looked at the state which unfolded and developed the joining of the front part and back part of the disposable diaper shown in FIG. 1 from the outer surface. The top view of the absorptive main body of the disposable diaper shown in FIG. 3 is represented. The VV sectional drawing of the disposable diaper shown in FIG. 2 and FIG. 3 is represented.

  The disposable diaper of this invention is demonstrated with reference to drawings. The present invention is not limited to the embodiments shown in the drawings.

  1 to 5 show a disposable pants-type diaper as an example of the disposable diaper of the present invention. FIG. 1 shows a perspective view of a disposable pant-type diaper, and FIG. 2 shows a view of a state where the front abdomen and the back part of the disposable diaper shown in FIG. FIG. 3 is a view showing a state in which the front abdomen and the back part of the disposable diaper shown in FIG. 1 are unfolded and viewed from the outside, and FIG. 4 shows the disposable diaper shown in FIG. The top view which took out the absorptive main body of this, and it looked at from the outer side surface was represented, and FIG. 5 represents VV sectional drawing of the disposable diaper shown in FIG.2 and FIG.3. In the drawings, the arrow x represents the width direction, the arrow y represents the front-rear direction, and the direction perpendicular to the plane formed by the arrows x and y represents the thickness direction z.

  The disposable diaper 1 has the exterior member 2 comprised from the front part P, the back part Q, and the crotch part R located between these. In the disposable diaper 1 shown in the drawings, the exterior member 2 has a waist opening 3 and a pair of leg openings 4 and is formed in a pants shape. The waist opening 3 is an opening for passing the wearer's torso, and the leg opening 4 is an opening for passing the wearer's leg.

  In the exterior member 2, the front abdomen P corresponds to a part applied to the wearer's abdomen when wearing the diaper, and the back part Q corresponds to a part applied to the wearer's dorsal side when wearing the diaper. . The crotch portion R is located between the front abdominal portion P and the back portion Q, and corresponds to a portion applied to the wearer's crotch. The crotch portion R is a portion located in the middle of the exterior member 2 divided into three in the front-rear direction, and is not joined to each other on both sides in the width direction x when formed in a pants shape. When the disposable diaper is a pants-type diaper, the exterior member 2 is formed into a pants shape by joining the front abdomen P and the back part Q at the joints 11 at both ends in the width direction x, for example.

  In the disposable diaper, the front-rear direction y means the direction from the front part P to the back part Q, and corresponds to the front-rear direction of the wearer's crotch when the diaper is worn. The width direction x corresponds to the left and right direction of the wearer when wearing a diaper. The skin side surface of the disposable diaper means a surface on the side facing the wearer's skin when the diaper is worn. The outer surface of the disposable diaper means a surface facing away from the wearer when the diaper is worn.

  The exterior member 2 may be composed of only one layer or may be composed of a plurality of layers. Preferably, the exterior member 2 includes an outer sheet 5 and an inner sheet 6 laminated on the skin side surface of the outer sheet 5.

  An absorbent main body 7 is attached to the crotch portion R of the exterior member 2. The absorptive main body 7 includes a top sheet 8, a back sheet 9, and an absorptive core 10 disposed therebetween (see FIG. 5). The top sheet 8 is arranged on the wearer side with respect to the absorbent core 10, and the back sheet 9 is arranged on the outer side (opposite side of the wearer) with respect to the absorbent core 10. As for the absorptive main body 7, the back sheet 9 is attached to the skin side surface of the exterior member 2. FIG. The absorptive main body 7 should just exist in the crotch part R of the exterior member 2, and may further extend to the front part P and / or the back part Q. The absorptive main body 7 may be formed in a substantially rectangular shape as shown in FIGS. 2 to 4 or a substantially hourglass shape, for example.

  The absorbent main body 7 is preferably provided with rising flaps 12 on both sides in the width direction x (see FIGS. 2 and 5). By providing the rising flap 12, it is possible to prevent side leakage of excrement such as urine. The rising flaps 12 are preferably provided on both sides in the width direction x of the top sheet 8 so that urine excreted from the wearer does not form a liquid pool between the rising flaps 12 and the top sheet. 8 is easily absorbed by the absorbent core 10 through the 8.

  For example, the rising flap 12 joins the side sheet 14 extending in the front-rear direction y to both sides of the top sheet 8 in the width direction x, and the rising elastic member 15 is attached to the inner end of the side sheet 14 in the width direction x. It is formed by providing (see FIG. 5). By providing the side seat 14 and the standing elastic member 15 in this manner, the inner side in the width direction x of the side seat 14 rises toward the wearer's skin by the contraction force of the standing elastic member 15, and the rising flap 12 is It becomes easier to form. The rising flap 12 or the side sheet 14 is preferably composed of a liquid-impermeable plastic film, a liquid-impermeable nonwoven fabric, or the like.

  As shown in FIGS. 1 to 3, a plurality of waist elastic members 19 are preferably provided along the edge of the waist opening 3 at the end in the front-rear direction y of the exterior member 2. The waist elastic member 19 forms a waist gather along the circumference of the wearer's waist and prevents excrement such as urine from the back side and the abdomen side from leaking.

  It is preferable that a plurality of trunk elastic members 20 extending in the width direction x are provided on the front abdomen P and the back part Q of the exterior member 2. The torso elastic member 20 is preferably disposed between the waist elastic member 19 and the leg opening 4 at a wider interval than the waist elastic member 19, and the torso elastic member 20 fits around the waist of the wearer. Sexuality is enhanced.

  The exterior member 2 is preferably provided with leg elastic members 18 along the edges of the leg openings 4. In particular, when the disposable diaper of the present invention is a pants-type diaper, the leg elastic member 18 is preferably provided as described above. In the drawing, the leg elastic member 18 includes a front leg elastic member 18F provided along the front edge of the leg opening 4 and a rear leg elasticity provided along the rear edge of the leg opening 4. It is comprised from the member 18B. The front leg elastic member 18F and the rear leg elastic member 18B provide an elastic member over substantially the entire periphery of the edge of the leg opening 4. The leg elastic members 18 form leg gathers around the wearer's legs and prevent excretion such as urine from the crotch. In the drawing, the front leg elastic member 18F and the rear leg elastic member 18B are provided apart from each other, but the front leg elastic member 18F and the rear leg elastic member 18B are in contact with each other or cross each other. May be.

  For the leg elastic member 18, the waist elastic member 19, and the body elastic member 20 provided in the exterior member 2, as shown in the drawing, when the exterior member 2 is composed of the outer sheet 5 and the inner sheet 6, It is preferable to be disposed between the outer sheet 5 and the inner sheet 6.

  As each elastic member provided in the disposable diaper, an elastic stretchable material used for a normal disposable diaper such as a polyurethane thread, a polyurethane film, or natural rubber can be used. Each elastic member is preferably fixed to the diaper in a stretched state, and is preferably fixed with an adhesive such as a hot melt adhesive. For example, polyurethane yarn having a fineness of 40 to 1,240 dtex is stretched and arranged at a magnification of 1.1 to 5.0 times and fixed. As the adhesive, it is preferable to use a rubber-based hot melt adhesive. The magnification is 1.0 in the non-expanded state.

  By the way, since a crotch part is pinched | interposed into a wearer's both legs at the time of wear of a disposable diaper, the absorptive main body provided in the crotch part, especially an absorptive core will become easy to be distorted by the movement of a wearer's both legs. And when an absorptive core is distorted, the fitting property to the crotch of a wearer of an absorptive core falls, and leakage of urine etc. becomes easy to occur. Particularly in a pants-type diaper, the crotch part of the diaper is easily pressed from both legs of the wearer, and the absorbent core is easily distorted. Therefore, in a disposable diaper, it is desirable to prevent distortion of the absorbent core as much as possible.

  Therefore, in the disposable diaper of the present invention, the absorbent core 10 is formed in a substantially hourglass shape, and the adhesive region 16 for fixing the back sheet 9 of the absorbent main body 7 to the exterior member 2 is shown in FIGS. 3 and 4. The front adhesive region 16F, the rear adhesive region 16B, and the central adhesive region 16C between them are divided in the front-rear direction y, and the central adhesive region 16C is formed narrower than the front adhesive region 16F and the rear adhesive region 16B. In addition, it is formed wider than the substantially hourglass-shaped constricted portion of the absorbent core 10, and the outer edge in the width direction x of the central adhesive region 16C is formed so as to cross the substantially hourglass-shaped inclined edge of the absorbent core 10. Yes. By forming the disposable diaper of the present invention in this way, the absorbent core 10 is less likely to be distorted by the movement of both legs of the wearer. Specifically, the absorbent core 10 is formed by forming the central adhesive region 16C narrower than the front adhesive region 16F and the rear adhesive region 16B and wider than the constricted portion of the absorbent core 10. The constricted part that is easily subjected to force from the wearer's legs is less likely to be rolled up. Moreover, since the non-adhesion area | region 17 overlaps with the absorptive core 10 and is formed in the outer side of the width direction x of the center adhesion area | region 16C rather than the constriction part of the absorptive core 10, the wearer Even if the absorbent main body 7 receives a force from both legs and is distorted, the distortion is absorbed by the non-adhesive region 17 and the absorbent core 10 is hardly distorted. As a result, the wearability of the absorbent core 10 to the wearer's crotch increases, and leakage of urine and the like is less likely to occur. Hereinafter, the absorbent core 10 and the adhesion region 16 will be described in detail.

  The absorbent core 10 has a front side portion 10F, a front intermediate portion 10FM, a central portion 10C, a rear intermediate portion 10BM, and a rear side portion 10B from the front side in the front-rear direction y. That is, the absorbent core 10 has a front side portion 10F, a rear side portion 10B, and a central portion 10C positioned between them in the front-rear direction y, and a front intermediate portion 10FM is formed between the front side portion 10F and the central portion 10C. Thus, a rear intermediate portion 10BM is formed between the rear side portion 10B and the central portion 10C. The absorbent core 10 is formed such that the front side portion 10F and the rear side portion 10B are wider than the central portion 10C, and the front intermediate portion 10FM and the rear intermediate portion 10BM are respectively changed from the central portion 10C to the front side portion 10F or the rear side portion 10B. The width is formed so as to gradually increase. By forming the absorbent core 10 in this way, the absorbent core 10 is formed in a substantially hourglass shape. And the absorptive core 10 becomes difficult to be pressed from a wearer's both legs by 10 C of center parts by forming the absorptive core 10 in a substantially hourglass shape, and when a diaper is worn, the absorptive core 10 becomes difficult to be distorted. .

  In the absorbent core 10, the central portion 10C corresponds to a substantially hourglass-shaped constricted portion, and the outer edges in the width direction x of the front intermediate portion 10FM and the rear intermediate portion 10BM correspond to a substantially hourglass-shaped inclined edge portion. In the absorbent core 10, the front side portion 10F and / or the rear side portion 10B are formed to be the widest in the width direction x, and the central portion 10C is formed to be the narrowest in the width direction x. The front side portion 10F and the rear side portion 10B may have the same or different length in the width direction x, and the front side portion 10F and the rear side portion 10B are formed to have substantially the same width in the drawing. The absorbent core 10 is formed such that the outer edge in the width direction x extends outward in the width direction x from the central portion 10C toward the front side portion 10F in the front intermediate portion 10FM, and the central portion 10C in the rear intermediate portion 10BM. To the rear side portion 10B so as to spread outward in the width direction x. In addition, it is preferable that the front side portion 10F is formed so as not to substantially change the length in the width direction x toward the front intermediate portion 10FM, and the rear side portion 10B is directed toward the rear intermediate portion 10BM. . The central portion 10C is preferably formed so that the length in the width direction x does not substantially change between the front intermediate portion 10FM and the rear intermediate portion 10BM.

  As for the absorptive core 10, it is preferable that center part 10C, front side intermediate part 10FM, and rear side intermediate part 10BM are located only in the crotch R. The central portion 10 </ b> C preferably extends in the front-rear direction y so as to cross the narrowest portion of the crotch portion R of the exterior member 2. The front side portion 10F and the rear side portion 10B are preferably located at least in the crotch portion R, and may extend to the front abdominal portion P and / or the back portion Q. Moreover, it is preferable that the absorptive main body 7 is formed narrower than the exterior member 2 as a whole.

  The back sheet 9 of the absorbent main body 7 is fixed by the exterior member 2 and the adhesive region 16. The adhesive region 16 is formed by applying an adhesive to the outer side surface of the back sheet 9 and the skin side surface of the exterior member 2. As the adhesive, it is convenient in production to use a hot melt adhesive, but it is not limited to this. The adhesive may be applied to the entire surface of the adhesive region 16, or may be applied to the adhesive region 16 in the form of a net, stripe, or dot. In the latter case, the adhesive is preferably applied uniformly in a predetermined pattern in the bonding area 16. When the adhesive is applied in a net shape, the adhesive may be applied by a curtain spray method, a spiral coating method, an omega coating method, or the like.

  The adhesive region 16 is formed between the front adhesive region 16F formed to overlap the front side portion 10F, the rear adhesive region 16B formed to overlap the rear side portion 10B, and the middle portion 10C from the front intermediate portion. The central adhesive region 16C is formed so as to overlap the portion 10FM and / or the rear intermediate portion 10BM, and the front adhesive region 16F and the rear adhesive region 16B are formed wider than the central adhesive region 16C. The adhesive region 16 may be formed by connecting the central adhesive region 16C to the front adhesive region 16F and / or the rear adhesive region 16B, or may be formed separately. Each adhesive region 16 is preferably formed in a substantially rectangular shape, and by forming the adhesive region 16 in this way, corners of the absorbent core 10, particularly the front side portion 10F and the rear side portion 10B of the absorbent core 10 are formed. The absorbent core 10 is unlikely to roll up at the ends in the front-rear direction y and the width direction x.

  The center adhesive region 16 </ b> C extends outward in the width direction x from the center portion 10 </ b> C of the absorbent core 10. That is, the center adhesive region 16C is provided so as to overlap the center portion 10C, and is provided so as to extend outward in the width direction x from the center portion 10C. By providing the central adhesive region 16C in this manner, even if the central portion 10C of the absorbent core 10 receives a force from both legs of the wearer, the central portion 10C is hardly rolled up. The center adhesive region 16 </ b> C is provided such that the outer edge in the width direction x is positioned inward from the outer edge in the width direction x of the absorbent main body 7. The center adhesive region 16C preferably extends, for example, 1 mm or more (more preferably 2 mm or more, more preferably 3 mm or more) outward in the width direction x from the center portion 10C, and 50 mm or less (more It is preferably 40 mm or less, more preferably 35 mm or less). Since the central adhesive region 16C is formed to be narrower than the front adhesive region 16F and the rear adhesive region 16B, the outer side of the central adhesive region 16C in the width direction x is not bonded to the exterior member 2. It will be. Therefore, the distortion of the exterior member 2 is not easily transmitted to the absorbent main body 7, which leads to prevention of distortion of the absorbent core 10.

  The center adhesive region 16C is formed such that the outer edge in the width direction x crosses the outer edge in the width direction x of the front intermediate portion 10FM and / or the rear intermediate portion 10BM. That is, since the center adhesive region 16C formed wider than the center portion 10C extends from the center portion 10C to the front intermediate portion 10FM and / or the rear intermediate portion 10BM, the outer edge in the width direction x has the front intermediate portion 10FM. And / or it will be formed so that the outer edge of the width direction x of the back side intermediate part 10BM may be crossed.

  A non-adhesive region 17 is formed outside the central adhesive region 16C in the width direction x so as to overlap at least the front intermediate portion 10FM and / or the rear intermediate portion 10BM of the absorbent core 10. In the non-adhesion region 17, the back sheet 9 and the exterior member 2 are not adhered, and a gap is formed between the back sheet 9 and the exterior member 2. By forming the non-adhesive region 17 in this manner, even if the absorbent main body 7 is distorted by receiving a force from both legs of the wearer, the distortion is absorbed by the non-adhesive region 17 and the absorbent core 10 is distorted. It becomes difficult. As a result, the wearability of the absorbent core 10 to the wearer's crotch increases, and leakage of urine and the like is less likely to occur.

  The non-adhesion region 17 includes a front non-adhesion region 17F formed on the front side of the absorbent core 10 and / or a rear non-adhesion region 17B formed on the rear side of the absorbent core 10. The front non-bonding region 17F may be formed so as to overlap at least the front intermediate portion 10FM, and may further extend so as to overlap the front side portion 10F. The front non-adhesion region 17F is formed on the rear side of the front adhesion region 16F, and is defined as a portion overlapping the absorbent core 10. The rear non-bonding region 17B may be formed so as to overlap with at least the rear intermediate portion 10BM, and further extend so as to overlap with the rear side portion 10B. The rear non-adhesion region 17B is defined as a portion that is formed in front of the rear adhesion region 16B and overlaps the absorbent core 10.

  It is preferable that the non-bonding region 17 is formed so that the rear non-bonding region 17B is longer in the front-rear direction y than the front non-bonding region 17F. In the disposable diaper, the rear side is more easily pressed by the wearer's buttocks than the front side, and the absorbent main body 7 is also easily distorted. Therefore, the distortion of the absorbent core 10 can be more effectively suppressed by forming the rear non-bonded region 17B longer in the front-rear direction y than the front non-bonded region 17F. Further, the diagonal absorption of the absorbent core 10 is less likely to occur. In this case, the length of the front non-bonding region 17F in the front-rear direction y may be, for example, 50% or less of the length of the rear non-bonding region 17B in the front-rear direction y. The aspect in which the rear non-adhesive region 17B is formed longer in the front-rear direction y than the front non-adhesive region 17F includes an aspect in which the front non-adhesive region 17F is not formed.

  The magnitude | size of the non-bonding area | region 17 is not specifically limited. For example, the length in the width direction x of the non-adhesive region 17 is preferably more than 15 mm, more preferably 18 mm or more, further preferably 20 mm or more, more preferably 100 mm or less, more preferably 80 mm or less, and further preferably 60 mm or less. The length in the front-rear direction y of the non-adhesion region 17 is preferably, for example, 10 mm or more, more preferably 15 mm or more, further preferably 20 mm or more, more preferably 125 mm or less, more preferably 100 mm or less, and further preferably 80 mm or less. If the non-adhesive region 17 is formed in this way, the distortion of the absorbent main body 7 is effectively absorbed by the non-adhesive region 17, and the absorbent core 10 is hardly distorted. The front non-adhesion region 17F may not be provided.

  The front adhesive region 16F and the rear adhesive region 16B may be formed wider than the central adhesive region 16C and not more than the same width as the absorbent main body 7. The front adhesive region 16F and the rear adhesive region 16B are preferably formed so as to overlap with the front side portion 10F and the rear side portion 10B of the absorbent core 10 in as wide an area as possible, whereby the front side portion 10F of the absorbent core 10 is formed. And the rear side portion 10B is not easily rolled up. The front adhesive region 16F is preferably positioned such that the outer edge in the width direction x is located outward from the outer edge in the width direction x of the front side portion 10F of the absorbent core 10 or inwardly within 15 mm. It is preferable that the outer edge of the width direction x is located outside the outer edge of the rear side portion 10B of the absorbent core 10 in the width direction x, or located within 15 mm in the rear side adhesion region 16B.

  The length in the front-rear direction y of the front adhesive region 16F is preferably 20% or more of the length in the front-rear direction y of the front side portion 10F of the absorbent core 10, and more preferably 50% or more. The length in the front-rear direction y of the rear adhesive region 16B is preferably 20% or more, more preferably 50% or more of the length in the front-rear direction y of the rear side part 10B of the absorbent core 10. By forming the front side adhesive region 16F and the rear side adhesive region 16B in this manner, the front side portion 10F and the rear side portion 10B of the absorbent core 10 are not easily rolled up.

  The front adhesive region 16F may be formed to overlap from the front side portion 10F to the front intermediate portion 10FM, and the rear adhesive region 16B may be formed to overlap from the rear side portion 10B to the rear intermediate portion 10BM. From the viewpoint of forming the non-adhesive region 17 as wide as possible, the front adhesive region 16F may overlap with only the front side portion 10F, and the rear adhesive region 16B may overlap with only the rear side portion 10B. Moreover, from the point which forms the non-adhesion area | region 17 widely, the center adhesion | attachment area | region 16C may overlap with the front side part 10F and / or the rear side part 10B. When the rear non-bonding region 17B is formed longer in the front-rear direction y than the front non-bonding region 17F, the front bonding region 16F is provided so as to overlap only the front side portion 10F, and the rear bonding region 16B is provided as the rear side portion 10B. May be provided so as to overlap from the rear intermediate portion 10BM.

  Each adhesion region 16 may be divided into a plurality. In particular, if the central adhesive region 16C is divided and provided, the absorbent core 10 is less likely to be distorted at the central portion 10C even if the absorbent main body 7 receives a force from both legs of the wearer. The central adhesive region 16C is preferably provided by being divided into two in the width direction x or by being divided into two in the front-rear direction y. By providing the central adhesive region 16C in this way, the absorbent main body 7 is centrally provided. While firmly fixed at the portion 10C, the absorbent core 10 is less likely to be distorted at the central portion 10C. In addition, when the adhesion area | region 16 is divided | segmented and provided, each divided | segmented adhesion area | region 16 is provided mutually spaced apart.

  When the leg elastic member 18 is provided in the exterior member 2, it is preferable that the leg elastic member 18 is provided intermittently at a portion overlapping the central adhesive region 16C (see FIG. 3). In this case, a front leg elastic member 18F extending along the front edge of the leg opening 4 on the exterior member 2 and extending across the central part 10C of the absorbent core 10 in the width direction x, and the leg opening 4 A rear leg elastic member 18B extending along the rear edge and extending across the central portion 10C of the absorbent core 10 in the width direction x is provided, and the front leg elastic member 18F and the rear leg elastic member are provided. It is preferable that 18B is intermittently provided in a portion overlapping with the central adhesive region 16C. In other parts, it is preferable that the front leg elastic member 18F and the rear leg elastic member 18B are provided continuously. By providing the leg elastic member 18 in this way, the absorbent core 10 is hardly distorted. Moreover, since the contractive force by the leg elastic member 18 extends to the vicinity of the absorbent core 10, the absorbent core 10 is lifted toward the wearer, and the fit of the absorbent core 10 between the wearer's crotch is increased. .

  In the case where the leg elastic member 18 is intermittently provided at a portion overlapping with the central adhesive region 16C, for example, after fixing the leg elastic member 18 to the exterior member 2, the leg elastic member 18 may be cut with a cutter or the like. At this time, it is preferable that the leg elastic member 18 is cut at a plurality of positions (preferably five or more) at a portion overlapping with the central adhesive region 16C. By doing in this way, the leg elastic member 18 can be provided intermittently easily on manufacture. In the portion where the leg elastic member 18 is intermittently provided, it is preferable that the contraction force of the leg elastic member 18 is substantially lost. The portion where the leg elastic member 18 is intermittently provided preferably has a length of 75% or more of the length of the portion where the leg elastic member 18 crosses the central portion 10C of the absorbent core 10.

  When the rising flap 12 is provided on the top sheet 8 side of the absorbent main body 7, as shown in FIGS. 4 and 5, the central adhesive region 16 </ b> C is located in the width direction x with respect to the base 13 that is the starting point of the rising flap 12. It is preferable to extend outward. In FIG. 4, a location where the base 13 of the rising flap 12 is located is indicated by a one-dot chain line. By providing the rising flap 12 in this way, the rising flap 12 is unlikely to fall inward in the width direction x when the rising flap 12 rises. That is, since the central adhesive region 16C extends outward in the width direction x from the base 13 of the rising flap 12, the absorbent main body 7 is unlikely to roll up at the base 13 of the rising flap 12, and the rising flap 12 It becomes difficult to fall inward in the width direction x. As a result, a wide space between the left and right rising flaps 12 is secured between the wearer's crotches, and it is easy to prevent side leakage of urine and the like.

  The above-described effect is particularly suitably achieved when the rising flap 12 is formed so as to rise from the base portion 13 by being folded outward in the width direction x. In this case, the rising flap 12 is formed by folding back the side sheets 14 provided on both sides of the top sheet 8 in the width direction x, and the side sheet 14 is fixed to the fixing portion 14A joined to the top sheet 8. The upright portion 14B is folded back from the inner end in the width direction x of the portion 14A to the outer side in the width direction x. If the rising flap 12 is formed in this way, the center adhesive region 16C extends outward in the width direction x from the base portion 13 of the rising flap 12, so that the absorbent main body 7 is fixed to the base portion 13 of the rising flap 12. Therefore, the upright portion 14B does not fall inward in the width direction x and can easily rise up in the width direction x.

  In the above case, it is preferable that the rising flap 12 is specifically formed as follows. That is, the side seat 14 has, as the upright portion 14B, a first upright portion that is folded back from the inner end in the width direction x of the fixed portion 14A outward in the width direction x, and the rising flap 12 is the first upright portion. It is preferable that it is formed from. In this case, the side seat 14 is folded into a substantially V shape that opens outward in the width direction x. Further, the side seat 14 includes, as standing parts 14B, a first standing part that is folded outward from the inner end in the width direction x of the fixed part 14A and outward in the width direction x, and an inner part in the width direction x from the first standing part. It is also preferable to have a second upright portion that is folded back and the rising flap 12 is formed of a first upright portion and a second upright portion. In this case, the side seat 14 is folded in a substantially Z shape. In the drawing, the rising flap 12 formed as in the former is shown.

  Although the case where the disposable diaper of the present invention is applied to a pants-type diaper has been described above, the disposable diaper of the present invention is provided with a pair of fastening members on the left and right side ends of the back portion, and the fastening member It may be an open type (tape type) disposable diaper formed into a pants shape when worn.

  The material of each member which comprises the disposable diaper of this invention is demonstrated. A top sheet is a sheet | seat located in a wearer side in the case of diaper wear, and it is preferable that it is liquid-permeable. As the top sheet, for example, a nonwoven fabric formed from hydrophilic fibers such as cellulose, rayon, and cotton, and a hydrophobic property such as polyolefin (eg, polypropylene, polyethylene), polyester (eg, PET), polyamide (eg, nylon), etc. A non-woven fabric formed from fibers, in which the surface of hydrophobic fibers is hydrophilized with a surfactant, can be used. Further, as the top sheet, a woven fabric, a knitted fabric, a plastic film in which holes are formed, or the like may be used.

  The back sheet is a sheet located on the side opposite to the wearer when the diaper is worn, that is, on the outside, and is preferably liquid-impermeable. As the back sheet, a non-woven fabric formed from hydrophobic fibers such as polyolefin (for example, polypropylene, polyethylene), polyester (for example, PET), polyamide (for example, nylon), a plastic film, or the like can be used. Moreover, you may use the laminated body of a nonwoven fabric and a plastic film. In the present invention, the liquid impermeability includes the meaning of water repellency.

  A material that can be used for the back sheet may be used for the rising flap and the side sheet.

  The exterior member may be liquid permeable or liquid impermeable, and a sheet material that can be used for a top sheet or a back sheet can be used. The exterior member is preferably formed by laminating an outer sheet on an inner sheet, and more preferably formed by laminating a liquid-impermeable outer sheet on a hydrophilic inner sheet. In this case, a sheet material usable for the top sheet can be used as the inner sheet, and a sheet material usable for the back sheet can be used as the outer sheet.

  When using a nonwoven fabric as each sheet material demonstrated above, it is preferable to use a spunbond nonwoven fabric, an air through nonwoven fabric, a point bond nonwoven fabric, a melt blown nonwoven fabric, an airlaid nonwoven fabric, an SMS nonwoven fabric, etc. as a nonwoven fabric.

  The absorbent core is not particularly limited as long as it includes an absorbent material that can absorb excrement such as urine. As an absorptive core, the molded object which shape | molded the absorptive material in the predetermined shape can be used, for example. The absorbent core may be covered with a sheet member such as a paper sheet (for example, tissue paper or thin paper) or a liquid-permeable nonwoven fabric. Examples of the absorbent material contained in the absorbent core include hydrophilic fibers such as cellulose fibers (for example, pulverized pulp fibers), polyacrylic acid-based materials, polyaspartic acid-based materials, cellulose-based materials, starch-acrylonitrile-based materials, and the like. Water-absorbing resin etc. are mentioned. Further, the absorbent material may include a heat-fusible fiber such as a polyolefin fiber such as polyethylene or polypropylene, a polyester fiber such as PET, or a polyamide fiber such as nylon. These heat-fusible fibers may be subjected to a hydrophilic treatment with a surfactant or the like in order to increase the affinity with body fluid such as urine.

  It is preferable that an absorptive material contains a hydrophilic fiber from the point which improves the absorption speed | rates, such as urine. Moreover, it is preferable that an absorptive material contains a water absorbing resin from the point which raises absorption capacity. Therefore, it is preferable that an absorptive core contains a hydrophilic fiber (especially pulp fiber) and a water absorbing resin. In this case, it is preferable to use, for example, a mixture of hydrophilic fibers mixed or dispersed in an aggregate of hydrophilic fibers.

  The absorbent core may be a sheet-like absorber. Examples of the sheet-like absorber include those formed so as to have a water-absorbing resin between nonwoven fabrics and have no pulp fibers. Since the sheet-like absorbent body thus formed has a water-absorbing resin between the nonwoven fabrics, a high absorption capacity can be realized. Moreover, since a sheet-like absorber does not have pulp fibers between nonwoven fabrics, it can be formed thin without being bulky.

  As a sheet-like absorber, a water-absorbing fiber may be used as an absorbent material. Also in this case, the sheet-like absorbent body is not bulky and is formed thin. Examples of the water-absorbing fiber include a fiber containing a protonated or salt-formed carboxyl group. For example, as disclosed in JP-B-52-42916, water-absorbing fibers can be obtained by hydrolyzing acrylic fibers and converting nitrile groups contained in the acrylic fibers into carboxyl groups. At this time, it is preferable that the carboxyl group contained in the water-absorbing fiber forms an alkali metal salt or an ammonia salt. Moreover, a water absorbing fiber can be manufactured by immersing a hydrophilic fiber in acrylic acid and precipitating acrylic acid on the fiber surface.

1: Disposable diaper 2: Exterior member 3: Waist opening 4: Leg opening 7: Absorbent body 8: Top sheet 9: Back sheet 10: Absorbent core, 10F; Front side part, 10FM: Front side middle part, 10C: Central part, 10BM: Rear middle part, 10B: Rear side part 12: Standing flap 13: Base part 16: Adhesion area, 16F; Front adhesion area, 16C: Central adhesion area, 16B: Rear adhesion area 17: Non-adhesion area , 17F: front non-adhesion region, 17B: rear non-adhesion region 18: leg elastic member, 18F: front leg elastic member, 18B: rear leg elastic member P: front abdomen Q: back R: crotch

Claims (5)

An exterior member having a front part, a back part, and a crotch part located between these parts;
A disposable diaper that is attached to the crotch portion of the exterior member, and has a top sheet, a back sheet, and an absorbent main body having an absorbent core disposed therebetween,
The absorbent core has, from the front side in the front-rear direction, a front side part, a front side intermediate part, a central part, a rear side intermediate part, and a rear side part, and the central part is the narrowest part of the crotch part of the exterior member The front side portion and the rear side portion are formed wider than the central portion, and the front intermediate portion and the rear intermediate portion are respectively directed from the central portion toward the front side portion or the rear side portion. Formed so that the width gradually increases,
The back sheet is fixed to the exterior member and an adhesive region, and the adhesive region includes a front adhesive region formed to overlap the front side portion, a rear adhesive region formed to overlap the rear side portion, and these A central adhesive region formed between the central portion and the front intermediate portion and / or the rear intermediate portion,
The front adhesive region and the rear adhesive region are formed wider than the central adhesive region,
The central adhesive region extends outward in the width direction from the central portion, and is formed so that an outer edge in the width direction crosses an outer edge in the width direction of the front intermediate portion and / or the rear intermediate portion. ,
Outside the central adhesive region in the width direction, a non-adhesive region is formed overlapping the absorbent core,
The non-adhesion region is characterized in that a rear non-adhesion region formed on the rear side is formed longer in the front-rear direction than a front non-adhesion region formed on the front side of the absorbent core. Disposable diapers. The disposable diaper according to claim 1, wherein the central adhesive region is divided into a plurality. Standing flaps are provided on both sides in the width direction of the top sheet,
The disposable diaper according to claim 1 or 2 , wherein the central adhesive region extends outward in the width direction from a base portion that is a starting point of the rising flap. The rising flap is formed by folding back side sheets provided on both sides in the width direction of the top sheet,
The disposable diaper according to claim 3 , wherein the side sheet has a fixed portion joined to the top sheet, and an upright portion folded back outward in the width direction from an inner end in the width direction of the fixed portion. The exterior member is formed in a pants shape having a waist opening and a pair of leg openings,
The exterior member includes a front leg elastic member that extends along a front edge of the leg opening and extends across the center of the absorbent core in a width direction, and a rear edge of the leg opening. A rear leg elastic member extending along the center of the absorbent core and extending across the width direction,
The front leg elastic member and the rear leg elastic member, the central intermittently provided in a portion overlapping with the adhesive area, claim 1-4 which is continuously provided in the other part The disposable diaper according to one item.