JP4162667B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a pants-type or open-type disposable diaper, and more particularly to a disposable diaper that can securely hold an absorbent core by a top sheet.

  FIG. 10 is a cross-sectional view of a portion applied to a crotch portion of a conventional pant-type diaper or open-type diaper.

  As shown in FIG. 10, this type of disposable diaper 100 has a liquid-permeable top sheet 101 directed to the wearer side (liquid receiving side) and a liquid-impermeable outer sheet 102 directed to the outside. The top sheet 101 and the outer sheet 102 are bonded to each other at both side regions 100a and 100a in the lateral direction of the diaper. In the central region 100b in the horizontal direction, an absorbent core 103 mainly composed of a fiber material such as pulp and containing a high-absorbency resin is interposed between the top sheet 101 and the outer sheet 102.

  In the conventional manufacturing process of this type of disposable diaper, the absorbent core 103 is installed on the outer sheet 102 developed in a planar shape, and the top sheet 101 developed in a planar shape is placed thereon. At this time, conventionally, the region to which the top sheet 101 is bonded is bonded to the top sheet 101 and the outer sheet 102 in the both side regions 100a and 100a, and absorbed from the top sheet 101 on the raised upper surface 100c on the liquid receiving side. The adhesion is limited to the surface 103a of the core 103.

  That is, conventionally, the top sheet 101 is bonded only in the vertical direction. As a result, the top sheet 101 is bonded only on a horizontal plane such as the both side regions 100a and the raised upper surface 100c, and the absorbent core 103 is bonded. The top sheet 101 is not bonded to a portion that is not a horizontal plane, such as the side ends 103c.

  In this way, the both side ends 103c of the absorbent core 103 and the top sheet 101 are not bonded, and the absorbent core 103 is thick, so that the gap between the both side ends 103c, 103c of the absorbent core 103 and the top sheet 101 is increased. Spaces 104 and 104 are easily formed.

  As shown in FIG. 10, in the conventional disposable diaper, both side ends 103 c and 103 c of the absorbent core 103 and the top sheet 101 are not bonded, and there is a space between the both side ends 103 c and 103 c and the top sheet 101. Since 104 and 104 are formed, the absorbent core 103 is not sufficiently held by the top sheet 101. In particular, the holding force of the absorbent core 103 in the horizontal direction in FIG. 10 is weak.

  When the wearer moves while the disposable diaper is worn, a torsional force, a lateral displacement force, and a twisting force act on the absorbent core 103. In particular, in a pants-type diaper, the wearer walks and leans with the disposable diaper attached, so that the force applied to the absorbent core 103 increases.

  When the force is continuously applied, the absorbent core 103 is twisted or displaced in the central region 100b of the diaper. As a result, the spaces 104, 104 between the side ends 103c, 103c of the absorbent core 103 and the top sheet 101 are likely to expand. Furthermore, when the absorbent core 103 is turned to either the left or right side, wrinkles are generated on the surface 103a of the absorbent core 103, and the adhesion between the surface 103a of the absorbent core 103 and the top sheet 101 is peeled off at this wrinkled portion. Further, there is a possibility that floating occurs between the surface 103a and the top sheet 101.

  When the above-described expansion of the space 104 or the floating between the surface 103a and the top sheet 101 occurs, the liquid such as urine given to the top sheet 101 is not efficiently absorbed by the absorbent core 103, and the diaper Causes side leakage such as urine.

  The present invention solves the above-described conventional problems, and stabilizes the holding of the absorbent core by the top sheet, particularly in the lateral direction, so that the absorbent core is not easily twisted, offset or twisted in the diaper. Thus, it aims at providing the disposable diaper which made it possible to prevent the fall of an absorption function with an absorption core.

The present invention has a front part applied to the wearer's ventral side, an intermediate part applied to the crotch part, and a rear surface part applied to the back side, and the direction from the front part of the main body toward the rear part is vertical. In a disposable diaper whose direction is perpendicular to the direction,
A top sheet in which at least a portion covering the lateral center of the upper surface of the absorbent core directed to the liquid receiving side is liquid permeable, an outer sheet directed to the outside opposite to the liquid receiving side, and the top sheet And an absorbent core interposed between the outer sheet and the outer sheet,
The top sheet and the outer sheet extend outward from both side ends of the absorbent core, and are joined directly or indirectly outside the both side ends to form a joining region,
In the region containing the longitudinal center of at least the intermediate portion, joint boundaries are transverse center side boundary of the junction region, it has entered the transverse center side than the two side ends of the absorbent core It is characterized by this.

  The top sheet and the outer sheet may be directly bonded to each other or may be bonded with another sheet interposed therebetween. Moreover, the top sheet should just be liquid-permeable at least the part which covers an absorption core.

In the present invention , the top sheet is in close contact with not only the liquid receiving side surface of the absorbent core but also both side ends of the absorbent core, and the top sheet enters both ends of the back side of the absorbent core. Therefore, it can restrain so that an absorption core may be wrapped from the both sides of a horizontal direction with a top sheet, and it becomes difficult to produce the twist of a absorption core, a deviation, and a twist.

  Further, the liquid-permeable top sheet covering the absorbent core is formed by bonding the liquid-permeable sheet and other sheets directly or indirectly on both sides in the lateral direction, and the other sheet and the outer side. The joining boundary with the sheet may enter the center side in the lateral direction from both lateral ends of the absorbent core.

Here, it is preferable that the liquid-permeable sheet is bonded to both lateral ends of the absorbent core in at least the region including the center in the vertical direction in the intermediate portion. Moreover, in the area | region including the center of the vertical direction in the said intermediate part at least, it is preferable that the said other sheet | seat is joined to the both ends of the said horizontal direction of the said absorption core.

  Usually, the liquid-receiving surface of the absorbent core and the top sheet are also bonded to each other. Furthermore, if the back surface side of an absorption core and an outer sheet | seat are adhere | attached, an absorption core can be reliably hold | maintained now on a diaper.

In the present invention , the top sheet or the other sheet may be pressed or molded so as to wrap both ends from the surface of the absorbent core, and then the top sheet and the outer sheet may be joined at both lateral sides.

Furthermore, in the present invention , on the liquid receiving side of the main body, a leak-proof cuff is provided that extends in the vertical direction and is spaced apart in the horizontal direction.
The leak-proof cuff includes a sheet having a fixed end and a free end fixed to the main body along the vertical direction, and a contraction force in the vertical direction attached to the sheet at or near the free end. An elastic member that exhibits
In the region containing the longitudinal center of at least the intermediate portion, the fixed end portions of the leakage preventing cuffs are provided away from the lateral side ends of the absorbent core, the liquid in the absorbent core by the both side ends of the absorbent core It is preferable that it can be absorbed.

Furthermore, on the liquid receiving side of the main body, a leak-proof cuff is provided that extends in the vertical direction and is spaced apart in the horizontal direction.
The leak-proof cuff includes a sheet having a fixed end and a free end fixed to the main body along the vertical direction, and a contraction force in the vertical direction attached to the sheet at or near the free end. An elastic member that exhibits
The sheet forming the leak-proof cuff is used as the other sheet bonded to both sides in the lateral direction of the liquid-permeable sheet, and the bonding boundary between the other sheet and the outer sheet is closer to the center than the absorbent core. Alternatively, the other sheet may be bonded to both lateral ends of the absorbent core.

  Further, in the present invention, the lateral side portions of the front portion and the lateral side portions of the rear portion are joined to each other, and a waist opening is formed at each edge of the front portion and the rear portion, It is effective when leg openings are formed on both sides of the intermediate portion, and the main body has a pant shape.

  In the case of the pants type, the wearer walks or wrinkles with the diaper on, so the top core holds the absorbent core attached to the crotch, so the top sheet is twisted, offset, and twisted. It is effective in that it can be prevented. However, the present invention can also be applied to open diapers.

  In the present invention, since the absorbent core is wrapped with a top sheet or the like, the absorbent core is less likely to be twisted, offset or twisted by the movement of the wearer. In particular, when the both ends of the absorbent core are joined to a top sheet or the like, the absorbent core is securely held. Therefore, peeling or space is less likely to occur between the top sheet and the absorption core, and the liquid absorption function of the absorption core can be sufficiently exhibited.

  FIG. 1 is a perspective view showing a pants-type disposable diaper as an embodiment of the present invention developed from the liquid-permeable sheet side, and FIG. 2 is a perspective view showing the pants-type disposable diaper shown in FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1, FIG. 4 is a cross-sectional view showing a state before the elasticity applying means is elastically contracted, and FIG. 5 is a cross-sectional view showing a disposable diaper showing a second embodiment.

  The disposable diaper 1 of the present invention shown in FIG. 2 is formed in a pants shape in advance, and has a so-called hourglass shape as shown in FIG. In the unfolded state shown in FIG. 1, the diaper 1 includes a front part 2A applied to the wearer's abdomen during use, a rear surface part 2C applied to the buttocks and / or back during use, and both sides 4B of the diaper 1 during use. 4B has an intermediate part 2B applied to the thigh and attached to the crotch part. A direction from the front surface portion 2A through the intermediate portion 2B to the rear surface portion 2C is defined as a Y direction (vertical direction), and a direction orthogonal thereto is defined as an X direction (lateral direction).

  As shown in the cross-sectional view of FIG. 3, the disposable diaper 1 has an absorbent core 12 placed on an outer sheet 11 and covered with a liquid-permeable top sheet 13. The top sheet 13 is covered with a liquid-impervious opening auxiliary sheet 14, and the top sheet 13 is exposed in an opening window 15 opening in the center of the opening auxiliary sheet 14.

  The outer shape of the outer sheet 11, the top sheet 13, and the auxiliary opening sheet 14 are all hourglass shapes having substantially the same dimensions.

  The outer sheet 11 and the top sheet 13 are adhesively bonded to each other in an outer region in the horizontal direction (X direction) and an outer region in the vertical direction (Y direction). For example, a hot-melt adhesive is used for this adhesive bonding. In the cross-sectional view of the intermediate portion 2 </ b> B shown in FIG. 3, the joining region between the outer sheet 11 and the top sheet 13 is indicated by 21 and 21. Further, the joining boundary between the outer sheet 11 and the top sheet 13, that is, the end portion on the center side in the lateral direction of the joining regions 21, 21 is indicated by reference numerals 22, 22.

  As shown in FIG. 3, when the disposable diaper 1 is in a free state, the joint boundaries 22, 22 enter the lateral center side from the lateral ends 12 b, 12 b of the absorbent core 12, and as a result, The liquid receiving side surface 12 a of the absorbent core 12 and both lateral ends 12 b, 12 b of the absorbent core 12 are held so as to be wrapped with the top sheet 13.

  Further, the surface 12a of the absorbent core 12 and the top sheet 13 are bonded to each other with a hot melt adhesive applied in a spiral shape or a wavy shape. Further, the absorbent core 12 and the top sheet 13 are bonded to each other at both side ends 12b and 12b of the absorbent core 12 with a hot-melt adhesive or the like.

  It is preferable that the top sheet 13 is bonded to both ends 12b and 12b of the absorbent core 12 over almost the entire region in the core thickness H direction, but at least the liquid receiving side (half the core thickness H) ( It is preferable that both side ends 12b, 12b of the absorbent core 12 and the top sheet 13 are bonded to each other on the upper side in the drawing.

  Further, the back surface 12c of the absorbent core 12 and the outer sheet 11 may be bonded with a hot melt adhesive or the like.

  As shown in FIG. 3, the structure in which the absorbent core 12 is wrapped with the top sheet 13 is preferably formed over the entire region in the longitudinal direction (Y direction) of the disposable diaper 1, but at least the intermediate portion 2 </ b> B. However, it is necessary that the enveloping structure shown in FIG. That is, when the envelopment structure shown in FIG. 3 is realized in a predetermined length range including the vertical center OO of the intermediate portion 2B applied to the crotch portion, the movement of the crotch portion absorbs the absorbent core 12. When acting on the absorbent core 12, it is possible to maintain the state in which the absorbent core 12 is reliably held from the lateral direction by the top sheet 13.

  Therefore, at least in the intermediate portion 2B, the absorbent core 12 is less likely to be twisted, offset, and twisted. As a result, voids due to adhesion peeling or the like are less likely to occur between the side end 12b of the absorbent core 12 and the top sheet 13 and between the surface 12a of the absorbent core 12 and the top sheet 13, and the absorption function by the absorbent core 12 is improved. Can fully demonstrate. Further, since the side end 12b of the absorbent core 12 and the top sheet 13 are in close contact with each other, a sufficient liquid absorbing function can be exhibited at the side end 12b.

The top sheet 13 is formed of a hydrophilic fiber or a hydrophilic fiber that has been subjected to hydrophilic treatment, such as a point bond, an air-through, a spunbond, or a spunlace nonwoven fabric. The basis weight is 10 to 40 g / m ² . The opening auxiliary sheet 14 is a non-woven fabric such as a point bond formed from hydrophobic fibers, or the non-woven point bond non-woven fabric treated with water.

  In the embodiment of the present invention, both the top sheet 13 and the auxiliary opening sheet 14 are formed of a nonwoven fabric that does not elastically shrink in the lateral direction (X direction).

The outer sheet 11 is elastically shrinkable in the lateral direction (X direction), and is a stretchable nonwoven fabric having an elastic shrinkage function such as point bond, spunbond, and spunlace containing 80% or more of crimped fibers. . Alternatively, the outer sheet 11 is a liquid-impermeable stretch film having an elastic contraction function and formed of a thermoplastic resin such as olefin, styrene, or urethane. In any case, the basis weight (basis weight) of the outer sheet 11 is 10 to 40 g / m ² .

  When an elastic nonwoven fabric is used as the outer sheet 11, it is preferable to reduce the liquid permeation function by performing a water proofing treatment or the like. Alternatively, a waterproof resin film may be interposed between the outer sheet formed of a stretchable nonwoven fabric and the absorbent core 12. In this case, the resin film may be either stretchable or non-stretchable.

  When a liquid-impervious stretchable film having an elastic contraction function is used as the outer sheet 11, the outer sheet 11 may be used as the outermost layer sheet of the diaper, or a non-woven fabric is laminated on the outer side of the stretchable film. A nonwoven fabric may be used as the outermost layer sheet. In this case, the nonwoven fabric may be either stretchable or non-stretchable.

  That is, if an elastic sheet that exhibits an elastic contraction function is used as the outer sheet 11, the other sheet laminated thereon may be stretchable or non-stretchable.

  The absorbent core 12 is formed of an absorbent material, for example, pulverized pulp or a mixture of pulverized pulp and a superabsorbent polymer, and the pulverized pulp or a mixture of pulverized pulp and a superabsorbent polymer is wrapped with an absorbent sheet such as tissue. It is a thing.

  In the embodiment of the present invention, using the difference in elastic shrinkage strain between the outer sheet 11 and the top sheet 13 in the X direction, as shown in FIG. 3, the surface 12a and both side edges 12b, 12b of the absorbent core 12 are used. Is wrapped with a top sheet 13. Therefore, it is preferable that the outer sheet 11 exhibits an elastic contraction function and the top sheet 13 does not exhibit an elastic contraction function as described above.

  However, the top sheet 13 may have elasticity and exhibit an elastic contraction function in the lateral direction. In this case, in the free state of the disposable diaper 1, the lateral strain amount of the top sheet 13 needs to be smaller than the strain amount due to the elastic contraction of the outer sheet 11 in the lateral direction. The difference between the amount of shrinkage in the lateral direction of the outer sheet 11 and the amount of shrinkage in the lateral direction of the topsheet 13 in the free state is 10% or more, including the case where the topsheet 13 does not cause elastic shrinkage in the lateral direction. And preferably 30% or less. If the difference in strain is less than the above range, the absorbent core 12 cannot be sufficiently wrapped with the top sheet 13. If the difference in strain exceeds the above range, the lateral compressive force acting on the absorbent core 12 becomes too large, and wrinkles may occur in the absorbent core 12.

  Note that the amount of strain is the length of the flat portion of the sheet when the outer sheet 11 and the top sheet 13 are bonded at the bonding regions 21 and 21, and the outer sheet 11 is elastically contracted as shown in FIG. (L1-L0) / L0 × 100 (%) where L1 is the length after elastic contraction of the flat portion of the sheet.

  Further, leakage-proof cuffs 16 are provided on the inner side of both side portions 4B, 4B in the lateral direction (X direction) of the disposable diaper 1. The leak-proof cuffs 16, 16 are formed of a hydrophobic sheet, and as shown in FIG. 3, the base end portion is sandwiched between the top sheet 13 and the auxiliary opening sheet 14, and the base The end portions are adhesively bonded to the top sheet 13 and the opening auxiliary sheet 14, respectively.

  In FIG. 3, the fixed ends of the leak-proof cuffs 16 and 16 are denoted by reference numerals 17 and 17. As shown in FIG. 1, the base end portions of the leak-proof cuffs 16 and 16 are in the range of a predetermined length including the center OO in the vertical direction (Y direction) of the intermediate portion 2B. 12 are located away from both lateral ends 12b, 12b. The free ends 18 and 18 of the leak-proof cuffs 16 and 16 are provided with elastic members 19 and 19 that exhibit elastic contraction force in the longitudinal direction (Y direction).

  As shown in FIG. 3, in this disposable diaper 1, since the top sheet 13 is always in close contact with the surface 12a of the absorbent core 12 and both side ends 12b, 12b, body fluids such as urine given to the top sheet 13 are The body fluid that permeates the top sheet 13 and is easily absorbed by the absorbent core 12 from the surface 12a, and the body fluid that has flowed to both sides in the lateral direction also permeates the top sheet 13 and is easily absorbed by the absorbent core 12 from both side edges 12b and 12b. That is, the surface area of the absorbent core 12 that absorbs the body fluid is very wide. In addition, since the fixed ends 17 and 17 of the leak-proof cuffs 16 and 16 are separated from the both side ends 12b and 12b of the absorbent core 12 at least in the intermediate portion 2B, the body fluid that has flowed to both lateral sides of the diaper is prevented from leaking cuff. 16 and the side end portion 12b of the absorbent core 12, and is absorbed by the side end portion 12b without being blocked by the leak-proof cuff 16.

Next, the manufacturing process of the disposable diaper 1 will be described.
As shown in FIG. 4, the absorbent core 12 is installed at the center in the lateral direction of the outer sheet 11 in a state where the outer sheet 11 is elastically stretched in the lateral direction (X direction) within a range of 10 to 30%. To do. At this time, the back surface 12c of the absorbent core 12 may be bonded to the outer sheet 11, or may not be bonded.

  Next, the top sheet 13 is placed on the outer sheet 11 and the absorbent core 12 without extending in the free state, that is, in the X direction. At this time, a hot melt adhesive is applied to the entire area (the entire length in the lateral direction) of the back surface (the surface facing the absorbent core 12) of the top sheet 13. Further, the base end portions of the leak-proof cuffs 16 and 16 are installed on the top sheet 13 via a hot melt adhesive, and the opening auxiliary sheet 14 is further installed thereon via the hot melt adhesive. .

  At this time, the sheets are preferably pressed from above and below in the joining regions 21 and 21. Further, light pressure may be applied from above the top sheet 13 on the surface 12 a of the absorbent core 12.

  When the extension force in the X direction of the outer sheet 11 is removed after the adhesive application and lamination process, the outer sheet 11 is elastically contracted in the F direction toward the center in the lateral direction. At this time, the joining boundaries 22 and 22 between the outer sheet 11 and the top sheet 13 approach toward the center in the lateral direction (X direction). As a result, the joining boundaries 22 and 22 absorb as shown in FIG. The core 12 enters the center side from both side ends 12b, 12b. Further, the top sheet 13 is pressed against the both side edges 12b and 12b of the absorbent core 12 by the contraction force of the outer sheet 11, and the both side edges 12b and 12b and the top sheet 13 are adhered by the adhesive applied to the back surface of the top sheet 13. Are bonded to each other.

  Next, the lateral side portion 4A of the front surface portion 2A and the lateral side portion 4C of the rear surface portion 2C are joined together, and the respective edge portions of the front surface portion 2A and the rear surface portion 2C, that is, the waist end portion 3A, A waist opening is formed at 3C. Further, leg openings are formed in both side portions 4B of the intermediate portion 2B, and a pants-type disposable diaper as shown in FIG. 2 is formed.

  In the embodiment shown in FIGS. 1 and 2, elastic members (elastic bands) 31 are attached to the waist ends 3A and 3C in the lateral direction, and the elastic members 31 are elastically contracted as shown in FIG. A waist gather is formed in the waist opening by the force. Leg-side elastic members (elastic bands) 32 are attached to the both side portions 4B. As shown in FIG. 2, leg gathers (leg-side cuffs) are formed around the leg openings by the elastic contraction force of the elastic members 32. ) Is formed. Furthermore, the leak-proof cuffs 16 and 16 stand up toward the wearer inside the leg opening.

  Next, FIG. 5 shows a disposable diaper according to a second embodiment of the present invention, and is a cross-sectional view showing a state in which the disposable diaper is extended in the lateral direction, as shown in FIG.

  In the embodiment shown in FIG. 5, the outer sheet 11 is formed of a nonwoven fabric or a waterproof resin film that does not have an elastic contraction function or has a small elastic contraction rate. However, an elastic member 35 that exhibits elastic contraction force in the X direction is interposed between the top sheet 13 and the outer sheet 11. The elastic member 35 is an elastic band extending in the horizontal direction, and a plurality of the elastic members 35 are arranged in the vertical direction within a predetermined length range in the vertical direction (Y direction) including the center OO of the intermediate portion 2B shown in FIG. Is provided. The elastic member 35 is bonded to the outer sheet 11 over its entire length in a state of being stretched by 10 to 30% in the lateral direction.

  In FIG. 5, since the elastic member 35 is joined to the outer sheet 11 in a state where the elastic member 35 is extended in the X direction by about 10 to 30%, when the elastic member 35 is free, The joint boundaries 22 and 22 move toward the center side in the lateral direction with respect to both end portions 12b and 12b of the absorbent core 12, and the absorbent core 12 is wrapped with the top sheet 13 as in FIG. .

  In the above-described embodiment, the top sheet 13 formed of one liquid-permeable nonwoven fabric or the like is provided on the upper surface of the outer sheet 11 and the absorbent core 12. The top sheet 13 is formed of the absorbent core 12. The portion covering the upper surface 12a may be liquid permeable, and the portions covering both lateral sides (both side ends 12b, 12b) may be hydrophobic and non-liquid permeable.

  In other embodiment of this invention of FIG. 6, the top sheet 13 is comprised from the liquid-permeable sheet 13a which covers an absorption core, and the other sheet | seat 13b joined to the both sides of the horizontal direction (X direction). Yes. The other sheet 13b may be liquid-permeable or non-liquid-permeable. In this case, when the outer sheet 11 is elastically contracted as shown in FIG. 3, the joining boundaries 22, 22 between the other sheet 13 b and the outer sheet 11 are closer to the center than the both side ends 12 b, 12 b of the absorbent core 12. Get in. The other sheet 13b is adhesively bonded to both side ends 12b and 12b of the absorbent core 12. Alternatively, as shown in FIG. 7, the liquid-permeable sheet 13 a may be adhesively bonded to both side ends 12 b and 12 b of the absorbent core 12. The other sheet 13b may be the opening auxiliary sheet 14.

  In another embodiment of the present invention shown in FIG. 8, the sheet 20, 20 forming the leak-proof cuff 16, 16 functions as the other sheet and covers the absorbent core 12. Sheet) is bonded to both sides of 13a. In this case, the joining boundaries 22 and 22 between the sheet 20 forming the leak-proof cuffs 16 and 16 and the outer sheet 11 enter the center side from both side ends 12b and 12b of the absorbent core 12. In this case, the sheet forming the leak-proof cuff is bonded to both side ends 12b, 12b of the absorbent core 12. Alternatively, as shown in FIG. 9, a structure in which a liquid-permeable sheet (top sheet) 13 a is adhesively bonded to both side ends 12 b and 12 b of the absorbent core 12 may be used.

The perspective view shown in the state where the pants type diaper was developed as one embodiment of the present invention. Perspective view showing a pants-type diaper Sectional view taken along line III-III in FIG. Sectional drawing which shows the state which extended | stretched FIG. 3 to the horizontal direction Sectional drawing which shows 2nd Embodiment and corresponds to FIG. Sectional drawing which shows other embodiment and corresponds to FIG. Sectional drawing which shows other embodiment and corresponds to FIG. Sectional drawing which shows other embodiment and corresponds to FIG. Sectional drawing which shows other embodiment and corresponds to FIG. Cross section of a conventional disposable diaper

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2A Front part 2B Middle part 2C Rear surface part 3A Front waist part 3C Rear waist part 4B Side part 11 Outer sheet 12 Absorption core 12a Absorption core surface 12b Absorption core side edge 12c Absorption core back face 13 Top sheet 13a Through Liquid sheet 13b Other sheet 14 Auxiliary opening sheet 15 Open windows 16, 16 Leak-proof cuff 21 Joining region 22 Joining boundary 35 Elastic member

Claims (7)

A front part applied to the wearer's ventral side, an intermediate part applied to the crotch part, and a rear surface part applied to the back side, the direction from the front part of the main body toward the rear part is the vertical direction, In disposable diapers where the orthogonal direction is the lateral direction,
A top sheet in which at least a portion covering the lateral center of the upper surface of the absorbent core directed to the liquid receiving side is liquid permeable, an outer sheet directed to the outside opposite to the liquid receiving side, and the top sheet And an absorbent core interposed between the outer sheet and the outer sheet,
The top sheet and the outer sheet extend outward from both side ends of the absorbent core, and are joined directly or indirectly outside the both side ends to form a joining region,
In the region containing the longitudinal center of at least the intermediate portion, joint boundaries are transverse center side boundary of the junction region, it has entered the transverse center side than the two side ends of the absorbent core A disposable diaper characterized by that. The top sheet is formed by directly or indirectly joining a liquid-permeable sheet and other sheets on both sides in the lateral direction, and the other sheet extends outward from the both side edges of the absorbent core. The disposable diaper according to claim 1, wherein the disposable region is formed by being joined directly or indirectly to the outer sheet . In the region containing the longitudinal center of at least the intermediate portion, the liquid-permeable sheet, wherein both side ends disposable diaper according to claim 2, wherein is joined to the absorbent core. The disposable diaper according to claim 2, wherein the other sheet is joined to the both side ends of the absorbent core at least in a region including the center in the longitudinal direction at the intermediate portion. On the liquid receiving side of the main body, there is provided a leak-proof cuff which extends in the vertical direction and is spaced apart in the horizontal direction,
The leak-proof cuff includes a sheet having a fixed end and a free end fixed to the main body along the vertical direction, and a contraction force in the vertical direction attached to the sheet at or near the free end. An elastic member that exhibits
In the region containing the longitudinal center of at least the intermediate portion, the fixed end portions of the leakage preventing cuffs are provided away from the lateral side ends of the absorbent core, the liquid in the absorbent core by the both side ends of the absorbent core The disposable diaper in any one of Claim 1 thru | or 4 which can be absorbed. On the liquid receiving side of the main body, there is provided a leak-proof cuff which extends in the vertical direction and is spaced apart in the horizontal direction,
The leak-proof cuff includes a sheet having a fixed end and a free end fixed to the main body along the vertical direction, and a contraction force in the vertical direction attached to the sheet at or near the free end. An elastic member that exhibits
Said sheet, said liquid-lateral disposable diaper according to claim 2, characterized in that used as said another sheet joined to both sides of the sheet forming the leakage preventing cuffs. The lateral sides of the front portion and the lateral sides of the rear portion are joined to each other, and waist openings are formed at the respective edges of the front portion and the rear portion, and both sides of the intermediate portion. The disposable diaper according to any one of claims 1 to 6 , wherein a leg opening is formed in the portion, and the main body forms a pants-type.