JP4417985B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

In general, the stool of an infant changes from watery stool to soft stool in about three months after birth, and solidifies at the beginning of the baby food. For this reason, in disposable diapers for babies, various techniques have been proposed in consideration of absorption of watery stool and soft stool (hereinafter also referred to as watery stool) (see, for example, Patent Documents 1 and 2). Among these, it has been found that the technique of perforating permeation holes in the liquid-permeable top sheet forming the body-side surface is effective for absorbing watery stool and the like.
Japanese Patent Laying-Open No. 2005-246811 Japanese Patent No. 2812340 JP 2006-149457 A JP 2006-239290 A

However, when the top sheet has the permeation holes as described above, there is a problem that the permeation holes are crushed due to shrinkage in the width direction particularly in the crotch portion, and the permeation function such as watery feces due to the permeation holes becomes insufficient.
As a solution to this problem, it was considered that the top sheet was welded and fixed to the member on the back surface side thereof as described in Patent Documents 3 and 4, but the crushing of the transmission holes can be prevented. However, there was a problem that the permeation function such as watery stool by the permeation hole was unexpectedly low.
Then, the main subject of this invention is preventing the crushing of a permeation | transmission hole and exhibiting sufficient permeation | transmission function of a solid substance.

  As a result of extensive research on the above problems, the following findings were obtained. That is, when fixing the top sheet by welding, if the fixing portion is densely arranged over the entire permeation hole group, a gap is hardly generated between the top sheet and the member on the back surface side. It was difficult for stool or the like to be taken into the back side of the top sheet. The following present invention has been made based on such knowledge.

<Invention of Claim 1>
An absorbent element is interposed between the liquid-permeable top sheet forming the body-side surface and the liquid-impermeable sheet located on the outer surface side, and the crotch is formed from the upper edge of the ventral side along the center in the width direction. In a disposable diaper having an absorbent main body extending to the upper edge of the street back side,
The top sheet has a width direction central region extending from the front end to the rear end through a portion corresponding to the crack, and is located on the left side and the right side of the width direction central region, respectively, and the top portion and the right side ridge portion of the left heel portion, respectively. A left intermediate region and a right intermediate region extending from the front end to the rear end through a portion corresponding to the top of the left side, and a left side extending from the front end to the rear end along the left side of the left intermediate region and the right side of the right intermediate region, respectively. An area and a right side area, and a left side edge area and a right side edge area extending from the front end to the rear end along the left side of the left side area and the right side of the right side area, respectively.
The entire width direction of at least the portion corresponding to the crack in the front-rear direction of the central region in the width direction, the entire width direction of the portion corresponding to the portion located on the left side of at least the top of the flange in the front-rear direction of the left region. And a plurality of transmission holes are drilled at predetermined intervals in each of the entire width direction of the portion corresponding to the width direction right side of the top of the flange portion in the front-rear direction of the right region, and the left side At least a portion corresponding to the top of the flange in the intermediate region, a portion corresponding to at least the top of the flange in the right intermediate region, and the left side edge region and the right side edge region are not perforated. Without
A first range within ± 10 mm in the width direction with reference to both side edges of the transmission hole group in the central region in the width direction, and within ± 10 mm in the width direction with reference to both side edges in the width direction of the transmission hole group in the left region The top sheet is fixed to a member on the back surface side in each of the second range and the third range within ± 10 mm in the width direction with reference to both side edges in the width direction of the transmission hole group in the right region. A plurality of welded portions are provided at predetermined intervals, and an adhesive for fixing the top sheet to a member on the back surface side thereof is not used, and the first range, the second range, and the third range are not used. Outside the range, the width direction central region, the left region and the right region are not fixed to the member on the back side,
A disposable diaper characterized by that.

(Function and effect)
In disposable diapers, a stronger pressure is applied to the diaper at the part corresponding to the top of the left and right buttocks, so the permeation holes are uniformly formed throughout the top sheet including the part corresponding to the top of the left and right buttocks as in the conventional product. If it provides, the excrement which permeate | transmitted the top sheet will return to the top sheet surface with the pressure added from the top part of a buttocks, and will bring about the situation of adhering to the top part vicinity of a buttocks. Therefore, it is desirable not to form a transmission hole in this part.
More specifically, the portion corresponding to the rupture in the diaper is a portion where there is no contact with the body or the pressure is weak even if it is present, and the portion corresponding to the excretion position of the stool. Therefore, a large number of permeation holes are formed at least in this portion (the portion corresponding to the crack in the central region in the width direction), so that excreted watery stool or the like can be quickly taken into the interior. Further, although a strong pressure is applied to a portion corresponding to the top portion of the buttock (bulging portion) in the diaper, a transmission hole is not formed in this portion (portion corresponding to the top portion of the buttock in the left and right intermediate regions). The adherence of excrement to the vicinity of the top of the buttocks due to the reverse reversal as in the prior art is difficult to occur. In this case, excrement that has not been taken up in the central region in the width direction and moved to both sides of the excrement is not taken up in the left and right middle regions, and more easily moves outward in the width direction around the top of the buttocks. A transmission hole is formed on the outer side of the intermediate region in the width direction (the portion corresponding to the portion located on the left side in the width direction of the top portion of the collar portion in the left region and the portion corresponding to the portion located on the right side in the width direction of the top portion of the collar portion in the right region). By being formed, excrement that moves around the top of the buttocks can be effectively taken into the interior.
Moreover, since the side edge part area | region of the left side of the left side area | region in the top sheet | seat and the right side area | region is a part used for fixation of a top sheet | seat, it is more preferable not to form a permeation | transmission hole also in this part.
The present invention utilizes the arrangement of the transmission hole group having such advantages. In the present invention, a welded portion for fixing is provided in a range within ± 10 mm in the width direction with reference to both side edges in the width direction of each transmission hole group, but the top sheet is not fixed in the transmission hole group outside the range. By not providing a welded part or adhesive, the width of the part having each permeation hole group is fixed by the welded part on both sides thereof, and the crushing of the permeation hole is suppressed, and the part between the welded parts is permeated. Since a gap is formed between the portion having the hole and the member on the back surface side, watery stool or the like is easily taken in through the permeation hole. Here, the reason why the first to third ranges are set to ± 10 mm in the width direction with respect to the respective reference side edges is due to consideration of a shift that inevitably occurs when the welded portion is formed. In this case, a case where the welded portion and the transmission hole overlap in the width direction is included, but it is needless to say that a form in which the welded portion and the transmission hole do not overlap in the width direction is preferable. Needless to say, the transmission hole of the present invention is a hole penetrating the front and back of the top sheet, and is not a hollow hole.

<Invention of Claim 2>
The transmission hole is formed by forming a slit along the front-rear direction at a transmission hole forming position of the top sheet, and then extending the top sheet in a width direction and expanding the slit, and the top sheet includes the slit. The disposable diaper according to claim 1, wherein regions in the vicinity of both side edges in the width direction of each transmission hole group are fixed to a member on the back surface side of the top sheet in an enlarged state.

(Function and effect)
By forming the permeation holes by such a method, a top sheet that is soft and excellent in liquid permeability can be obtained, and regions in the vicinity of both side edges in the width direction of each permeation hole group in a state where the top sheet is expanded. Is fixed to the member on the back surface side of the top sheet, so that it is possible to firmly fix the top sheet while maintaining the opening state of the transmission holes.

<Invention of Claim 3>
The top sheet is a non-woven fabric having a fineness of raw material fibers of 1.0 to 3.0 dtex and a fiber basis weight of 10 to 30 g / m ² .
The arrangement of the transmission holes is an arrangement in which transmission hole rows in which the transmission holes are arranged at a predetermined interval in the front-rear direction are provided at a predetermined interval in the width direction,
The arrangement of the welded portions is an arrangement in which the welded portion rows in which the welded portions are arranged at predetermined intervals in the front-rear direction are provided at predetermined intervals in the width direction,
The opening area of the transmission holes is 0.8 to 180 mm ² , the width direction interval of the transmission hole rows in each of the width direction central region, the left side region, and the right side region is 1 to 5 mm, and the inside of the transmission hole row The interval in the front-rear direction of the through holes is 1 to 10 mm,
The area of the welded portion is 0.7 to 40 mm ² , the interval in the width direction of the welded portion row is ² to 15 mm, and the interval in the front-rear direction of the welded portion in the welded portion row is 5 to 30 mm.
The disposable diaper according to claim 1 or 2.

(Function and effect)
As the top sheet, a non-woven fabric having a degree described in this section is preferable from the viewpoints of touch and strength. In this case, if the opening area of the permeation hole is not larger than the fiber gap, there is no significance in providing the permeation hole, and if the opening area of the permeation hole is larger than the fiber gap, the intake performance of watery feces etc. may be insufficient. There is. Furthermore, even if the opening area is large, the number is small, and if it is arranged sparsely, the capturing performance of watery stool or the like is poor. Therefore, it is preferable that the opening area and the arrangement interval of the transmission holes are within the range described in this section. And with respect to the area and arrangement interval of such permeation holes, if the area and arrangement interval of the welded portion are within the range described in this section, even when the crotch portion of the paper diaper is bent and narrowed in the width direction, Since the opening state of the permeation hole can be stably maintained, watery stool or the like can always be reliably taken into the inside.

<Invention of Claim 4>
Of the first range, the occupation area of the welded portion on the left side in the width direction of the transmission hole group in the central region in the width direction increases as the distance from the transmission hole group in the central region in the width direction increases to the left in the width direction. Among them, the area occupied by the welded portion on the right side in the width direction of the transmission hole group in the central region in the width direction is larger as it moves away from the transmission hole group in the central region in the width direction on the right side in the width direction,
Of the second range, the area occupied by the welded portion on the left side in the width direction of the transmission hole group in the left side region is larger as the distance from the transmission hole group in the left side region to the left side in the width direction increases. The area occupied by the welded portion on the right side in the width direction of the transmission hole group in the region is larger as the distance from the transmission hole group in the left region is increased to the right in the width direction,
Of the second range, the area occupied by the welded portion on the left side in the width direction of the permeation hole group in the right region increases as it moves away from the permeation hole group in the right region toward the left side in the width direction. The area occupied by the welded portion on the right side in the width direction of the permeation hole group of the region is larger as it moves away from the permeation hole group of the right region to the right side in the width direction,
The disposable diaper of any one of Claims 1-3.

(Function and effect)
Thus, even if the top sheet is shifted in the width direction in the welding step, the welded portion is configured to be configured so that the area occupied by the welded portion becomes larger in the width direction from the side edge of the reference transmission hole group. And the permeation holes are difficult to overlap, and even if they overlap, the area is small. Further, in the present invention, since there is some unfixed portion of the topsheet, the fixing strength of the topsheet is inevitably reduced, but the area occupied by the welded portion is increased as it moves away from the side edge of the reference permeation hole group. If comprised so, since the fixing strength by a welding part increases so that it is far from the side edge of a permeation hole group, the fall of the fixing strength resulting from the said non-fixed part can be compensated to some extent.

<Invention of Claim 5>
Of the welded portions provided in the first range, the welded portion provided on the left side in the width direction of the transmission hole group in the central region in the width direction is front and rear as the distance from the transmission hole group in the central region in the width direction increases to the left in the width direction. The weld portion provided on the right side in the width direction of the transmission hole group in the central region in the width direction among the weld portions provided in the first range has a shape having a large direction length. It has a shape in which the length in the front-rear direction increases as it moves away from the transmission hole group to the right in the width direction,
Of the welded portions provided in the second range, the welded portion provided on the left side in the width direction of the transmission hole group in the left region has a length in the front-rear direction as it moves away from the transmission hole group in the left region in the width direction left side. Of the welded portions provided in the second range, the welded portion provided on the right side in the width direction of the transmission hole group in the left region is on the right side in the width direction from the transmission hole group in the left region. It has a shape in which the length in the front-rear direction increases as it moves away,
Of the welded portions provided in the third range, the welded portion provided on the left side in the width direction of the transmission hole group in the right region has a longitudinal length as it moves away from the transmission hole group in the right region in the width direction left side. Of the welded portions provided in the third range, the welded portion provided on the right side in the width direction of the transmission hole group in the right region is located on the right side in the width direction from the transmission hole group in the right region. It has a shape in which the length in the front-rear direction increases as it moves away,
The disposable diaper of any one of Claims 1-3.

(Function and effect)
Thus, by making the shape of the welded portion into a shape in which the length in the front-rear direction increases as the distance from the side edge of the reference permeation hole group increases in the width direction, the same effect as that of the invention according to claim 3 is achieved. It is made.

<Invention of Claim 6>
A plurality of intermediate region welded portions that fix the top sheet to members on the back surface side of the left intermediate region and the right intermediate region outside the first range, the second range, and the third range, respectively. Are provided at predetermined intervals,
The area of the intermediate region welded portion is larger than the welded portions provided in the first range, the second range, and the third range,
The disposable diaper of any one of Claims 1-3.

(Function and effect)
Thus, while making the area of a middle region welding part larger than the welding part provided in the 1st range, the 2nd range, and the 3rd range, it can improve the fixed strength of a top sheet. Since the portion to which pressure is applied by the top portion of the buttock is welded in a larger area, the reversion at the portion is further reduced.

  As described above, according to the present invention, the permeation holes are prevented from being crushed, and there are advantages such as a disposable diaper having an excellent solid material permeation function.

As disposable diapers for infants of watery stools and soft stools, so-called tape diapers are widely used, so in the following, examples of tape diapers will be drawn and explained. Needless to say, the present invention is applicable to other forms of disposable diapers such as pants-type disposable diapers. The present invention is naturally applicable to adult disposable diapers.
1 and 2 show an example of a tape-type disposable diaper according to the present invention. FIG. 2 is a view taken along line B-B in FIG. This tape-type disposable diaper extends from the upper edge F1 of the ventral side F through the crotch part C to the upper edge B1 of the dorsal side B along the center in the width direction. , On both sides of the upper edge F1 side portion of the ventral side F, a pair of abdominal side flap portions FF, FF extending to the outside in the width direction from the crotch portion C, and both sides of the upper edge B1 side portion of the back side B Are provided with a pair of dorsal side flap portions BF, BF extending to the outside in the width direction from the crotch portion C. Moreover, the fastening piece 130 as a locking member is provided in the back side flap part BF and BF, respectively.
More specifically, the entire outer surface of the absorbent main body 10 and the side flap portions BF and FF on the back side and the abdomen side is formed by the exterior sheet 12. In particular, in the absorbent main body 10, a liquid-impermeable sheet 11 is fixed to the inner surface side of the exterior sheet 12 with an adhesive such as a hot-melt adhesive, and an absorbent element is further disposed on the inner surface side of the liquid-impermeable sheet 11. 50, the intermediate sheet 40, and the top sheet 30 are laminated in this order. In the illustrated example, the top sheet 30 and the liquid-impermeable sheet 11 are rectangles extending from the ventral upper edge F1 to the back upper edge B1, and have slightly larger dimensions in the front-rear direction and the width direction than the absorbent element 50. The liquid-impermeable sheet 11 is formed to be slightly wider than the top sheet 30. The peripheral edge that protrudes from the side edge of the absorbent element 50 in the top sheet 30 and the peripheral edge that protrudes from the side edge of the absorbent element 50 in the liquid-impermeable sheet 11 are fixed by a hot melt adhesive or the like. The top sheet 30 is fixed to the intermediate sheet 40 or the absorbing element 50.
Further, barrier cuffs 60, 60 projecting (standing) toward the wearer's skin are provided on both sides of the absorbent main body 10, and barrier sheets 64, 64 forming the barrier cuffs 60, 60 are provided. In addition, the inner side of each of the side flap portions BF and FF on the back side and the ventral side is extended over the entire widthwise outer side of the absorbent main body portion 10.

Hereinafter, the material and the characteristic part of each part are demonstrated in order.
(Exterior sheet)
The exterior sheet 12 is a part that supports the absorbent element 50 and is attached to the wearer. The exterior sheet 12 has an hourglass shape in which the center part in the front-rear direction on both sides is constricted, and this is a part into which the wearer's leg is placed.
The exterior sheet 12 is preferably a non-woven fabric, but is not limited thereto. The type of the nonwoven fabric is not particularly limited, and as the material fiber, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, and natural fibers such as cotton are used. As a processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, laminated nonwoven fabrics such as SMS nonwoven fabrics and SMMS nonwoven fabrics are preferred in that both the touch and strength can be achieved. In addition to using a single nonwoven fabric, a plurality of nonwoven fabrics can be used. In the latter case, the nonwoven fabrics 12 are preferably bonded to each other with a hot melt adhesive or the like.

(Top sheet)
The top sheet 30 is sufficient as long as it has liquid permeability, but a nonwoven fabric is preferably used from the viewpoint of touch and the like. The nonwoven fabric used for the top sheet 30 is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. In particular, an air-through nonwoven fabric, a spunbonded nonwoven fabric, a pointbonded nonwoven fabric, or an SMS nonwoven fabric having a fineness of raw material fibers of 1.0 to 3.0 dtex and a fiber basis weight of 10 to 30 g / m ² are suitable.
The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

(Top sheet transmission hole)
The top sheet 30 has the following respective areas on the basis of the correspondence between the crack on the back side and the top of the buttocks. That is, the top sheet 30 is located on the left side and the right side of the width direction central region 31 passing through the part corresponding to the crack and extending from the front end F1 to the rear end B1, and on the left side and the right side, respectively. The left and right intermediate regions 32 and 32 extending from the front end F1 to the rear end B1 through the portions corresponding to the top and the top of the right collar, along the left side of the left intermediate region 32 and the right side of the right intermediate region 32 And left and right regions 33, 33 extending from the front end F1 to the rear end B1, respectively. Further, in the illustrated embodiment, side edge regions 34 and 34 including portions for joining and fixing the top sheet 30 to the liquid-impermeable sheet 11 are provided on the left side of the left side region and on the right side of the right side region. The right region 33 is a region located on the absorbent element 50.
Specifically, in the baby diaper, the width of the central region 31 in the width direction is about 20 to 40 mm, the width of the left intermediate region and the right intermediate region 32 is about 15 to 25 mm, and the width of the left region and the right region 33 is 10 to 10 mm. It is appropriate to set it to about 20 mm.
And characteristically, as shown also in FIG. 3, the solid content such as watery stool is permeated to the back side in each of the width direction central region 31, the left side and the right side region 33 in the top sheet 30. A large number of permeation holes H are perforated at a predetermined interval, and the permeation holes H are not perforated in the left and right intermediate regions 32 and 32 as a whole. Accordingly, the width direction central region 31, the left side and the right side are arranged so that the width direction arrangement of the perforated range and the non-perforated range of the transmission holes H is applied to at least the crack, the top portion of the heel portion, and the portion corresponding to the outer side in the width direction. The range of the area 33 is determined. In addition, if the crack, the top of the buttock, and the portion corresponding to the outer side in the width direction are included, only a part of each region 31 to 33 in the front-rear direction has such a width direction arrangement of the piercing range and the non-piercing range. For example, it is also possible to adopt such a pattern only on the back side B.
Further, when the width of the left and right regions 33, 33 is narrower than the width of the central region 31 in the width direction, when the wearer lies down sideways, the buttock is returned from the transmission hole H of the left or right region 33 that contacts the buttock. This is preferable because the amount of excrement adhering to the water is small.
The opening shape of the transmission hole H can be an appropriate shape such as a circle, an ellipse, an oval, a leaflet shape, a polygon, etc., but the length HL in the front-rear direction is 4 to 15 mm, particularly 6 to 8 mm. It is preferable that the width direction length HW is an elongated shape (elliptical shape, oval shape, leaf shape) shorter than the length HL in the front-rear direction.
Although the opening area of the transmission hole H may be appropriately determined, it is preferable to be 0.8～180Mm ^2, particularly preferably in a 5～80Mm ^2, and most preferable to be 10 to 30 mm ^2. If the opening area is too small, the solid content taking-in performance is lowered, and if it is too large, it is easy to return through the permeation hole H.
The number of transmission holes H can be determined as appropriate. As shown in the figure, the arrangement of the transmission holes H is such that the transmission hole arrays in which the transmission holes H are arranged at predetermined intervals in the front-rear direction are provided at predetermined intervals in the width direction. In the case of the above-described arrangement and the opening area of the transmission holes H described above, the width-direction interval DW between the rows of the transmission holes H is 1 to 5 mm, and the interval DL in the front-rear direction of the transmission holes H in the row is 1 to 1. It is preferable to determine the number and arrangement in each of the regions 31 to 33 so as to be 10 mm. If the interval between the permeation holes H is too wide, the solid content is easily captured without being captured, and if it is too narrow, the number of the permeation holes becomes too large and reversal is likely to occur through the permeation holes H. The arrangement of the through holes H can be a staggered arrangement (illustrated example) or a lattice (matrix) arrangement, and other regular or irregular arrangements can be adopted.
The transmission hole H may be the same shape, the same size, and the same arrangement interval as those formed in the width direction central region 31 and those formed in the left and right regions 33 and 33, but different from each other. You can also. As one preferred form, as shown in FIG. 4, the width direction length HW1 of the opening of the transmission hole H formed in the width direction central region 31 is 4 to 10 mm, and is formed in the left and right regions 33 and 33. It is proposed that the width direction length HW2 of the opening of the transmission hole H is shorter than that of the central region 31 in the width direction and is 2 to 7 mm. Thus, if the width direction length HW1 of the opening of the transmission hole H formed in the left and right regions 33, 33 is shorter than that in the center region in the width direction, the transmission that contacts the buttocks when the wearer lies down sideways. Since the total area of the holes is small, there is an advantage that the amount of excrement returning from the permeation holes and adhering to the buttocks is small.
Moreover, as another preferable form, as shown in FIG. 5, the opening area of the transmission hole H formed in the width direction center region 31 is 5 to 40 mm ² and formed in the left and right regions 33 and 33. One having an opening area of the transmission hole H larger than that of the central region 31 in the width direction and 10 to 50 mm ² is proposed. Thereby, the stool having a high solid content ratio that has reached the left and right regions 33 and 33 can be captured effectively. The fixing by the welding part of the top sheet 30 will be described later.

(Intermediate sheet)
An intermediate sheet (also referred to as a second sheet) 40 can be provided between the top sheet 30 and the absorbent element 50 in order to move excrement that has passed through the top sheet 30 to the absorbent body and prevent reversal. This intermediate sheet 40 not only improves the absorption performance by the absorber by quickly transferring the excrement to the absorber, but also prevents the excretion of the absorbed excrement from returning from the absorber, making the top sheet 30 surface feel better To do. The intermediate sheet 40 can be omitted.
As the intermediate sheet 40, the same material as that of the top sheet 30 can be used, but an air-through nonwoven fabric that is particularly bulky and excellent in liquid permeability is preferable. The intermediate sheet 40 is preferably bonded to the top sheet 30. When heat embossing or ultrasonic welding is used for the bonding, the material of the intermediate sheet 40 preferably has the same melting point as the top sheet 30. Further, considering the permeation of the solid content in the stool, the fineness of the fiber used for the intermediate sheet 40 is preferably 5.0 to 7.0 dtex, but the liquid residue in the top sheet 30 increases. On the other hand, when the fineness of the fiber used for the intermediate sheet 40 is 1.0 to 2.0 dtex, the liquid residue of the top sheet 30 hardly occurs, but the solid content of the stool is difficult to permeate. Therefore, it is preferable that the fiber of the nonwoven fabric used for the intermediate sheet 40 has a fineness of about 2.0 to 5.0 dtex.
It is preferable that the intermediate sheet 40 has a shape including the entire formation range of the permeation holes H so that the feces that have passed through the permeation holes H can be reliably captured. The intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbent element 50, but may be provided over the entire width. The length in the longitudinal direction of the intermediate sheet 40 may be the same as the entire length of the diaper, may be the same as the length of the absorbent element 50, or may be within a short length range centered on the region that receives the liquid.

(Barrier cuffs)
In order to prevent urine and soft stool that move laterally on the top sheet 30 and prevent side leakage, barrier cuffs 60, 60 that protrude (stand up) on the use surface side are provided on both sides of the product. preferable.
The barrier cuff 60 includes a barrier sheet 64 that is substantially continuous in the width direction, and an elongated elastic elastic member 62 that is fixed to the barrier sheet 64 in a stretched state along the front-rear direction. As the barrier sheet 64, a water-repellent nonwoven fabric can be used, and as the elastic elastic member 62, thread rubber or the like can be used. As shown in FIGS. 1 and 2, a plurality of elastic elastic members can be provided in addition to a plurality of elastic expansion members.
The inner surface of the barrier sheet 64 has a fixing start end in the width direction on the side portion of the top sheet 30, and a portion on the outer side in the width direction from the fixing start end is on the side portion of the liquid-impermeable sheet 11 and on the outer side in the width direction. It fixes to the side part of the exterior sheet | seat 12 located with the hot-melt-adhesive agent etc. An elastic elastic member 66 such as a rubber thread is provided along the front-rear direction between the sheets of the portion where the barrier sheet 64 and the exterior sheet 12 face each other in the vicinity of the fixing start end of the fixing portion.
Around the legs, the inner side in the width direction from the sticking start end of the barrier cuff 60 is fixed on the top sheet 30 at both ends in the product front-rear direction, but the portion between them is an unfixed free portion, and this free portion is It comes to stand by the contraction force of the rubber thread 62. When the diaper is worn, the diaper is worn on the body in the shape of a boat, and the contraction force of the rubber thread 62 acts on the diaper, so that the barrier cuff 60 stands up and comes into close contact with the legs around the contraction force of the rubber thread 62. As a result, so-called side leakage from around the legs is prevented.

(Absorption element)
The absorption element 50 is a part that absorbs and holds liquid such as urine and loose stool. The absorbent element 50 includes an absorbent body 56 and a covering sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The covering sheet 58 can be omitted. Further, in the illustrated embodiment, the holding sheet 80 is provided between the absorber 56 and the back surface side portion (lower part) of the covering sheet 58, but the holding sheet 80 may be omitted. The absorbent element 50 can be adhered to the inner surface of the liquid-impermeable sheet 11 via an adhesive such as a hot melt adhesive on the back surface.

(Absorber)
The absorber 56 can be formed by an aggregate of the fibers 52 and 52. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used.

(Superabsorbent polymer particles)
As shown in FIG. 2, the absorbent body 56 preferably includes superabsorbent polymer particles 54, 54..., In particular, at least in the liquid receiving region, the superabsorbent polymer particles with respect to the aggregate of fibers 52, 52. It is desirable that (SAP particles) be dispersed substantially throughout the thickness direction.
If there is no SAP particle in the upper part, the lower part, and the middle part of the absorber 56, or if there is very little, it cannot be said that the "absorbed throughout the thickness direction". Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper part, the lower part, and / or the middle part of the aggregate of fibers in addition to the form“ uniformly ”distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. In addition, a form in which some SAP particles do not penetrate into the aggregates of the fibers 52, 52... Remain on the surface, and some SAP particles pass through the aggregates of the fibers 52, 52. The form on the sheet 58 and the form on the holding sheet 80 are not excluded.
The superabsorbent polymer particles 54 include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles 54 can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. Examples of the superabsorbent polymer particles 54 include starch-based, cellulose-based and synthetic polymer-based polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, sodium carboxymethylcellulose, and the like. A cross-linked product or an acrylic acid (salt) polymer can be used. The shape of the superabsorbent polymer particles 54 is preferably a granular material that is usually used, but other shapes can also be used.
As the superabsorbent polymer particles 54, those having a water absorption speed of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.
The basis weight of the superabsorbent polymer particles 54 can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. If it exceeds 350 g / m ² , not only will the effect be saturated, but an excessively high superabsorbent polymer particle 54 will give a sense of incongruity.

(Enveloping sheet)
When the covering sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .
As shown in FIG. 2, the covering sheet 58 wraps only the back and side surfaces of the continuous fiber 52, 52... And the superabsorbent polymer particles 54, 54. It may be covered. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials becomes a component of the covering sheet). If necessary, the aggregate of continuous fibers 52, 52... And the layer of superabsorbent polymer particles 54, 54... May be sandwiched between two upper and lower sheets or disposed only on the lower surface. This is not a desirable form because it is difficult to prevent the movement of particles.

(Holding sheet)
When a filament aggregate is used for the fiber 52, it is preferable to provide a holding sheet 80. In the case where the holding sheet 80 is provided, the superabsorbent polymer particles 54 can be interposed between the holding sheet 80 and the absorbent body 56 by spraying or the like. The superabsorbent polymer particles 54 may pass through the filament aggregate at the time of supply to the filament aggregate or in the subsequent process or until the consumer uses it. The unevenness of the superabsorbent polymer particles that have passed through the filament aggregate gives a crisp and uncomfortable feeling when touched by a hand when used by a consumer.
The holding sheet 80 reinforces the stiffness that is not sufficient only by the covering sheet 58 such as tissue paper (crepe paper), and also reduces or prevents a sense of incongruity when touched by the hand when the consumer uses it. Fulfill.
The material of the holding sheet 80 is not particularly limited as long as it has a holding performance of the superabsorbent polymer 54. Specifically, for example, non-woven fabric, crimped pulp, low-absorbency cotton fiber (for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with a water repellent or a hydrophobizing agent, etc.). ), Polyethylene fiber, polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber and the like.
The holding sheet 80 preferably has a thickness larger than the particle diameter of the superabsorbent polymer particles. The basis weight of the holding sheet 80 is 10 to 60 g / m ^2, it is preferred in particular 20 to 40 g / m ^2.
In particular, the holding sheet 80, the compression energy 0.01~10.00gfcm / cm ² based on KES test, preferably at 0.01~1.00gfcm / cm ^2, and the compression resilience from 10 to 100%, preferably Is preferably 70 to 100% non-woven fabric.
Further, since the superabsorbent polymer 54 that has slipped out is held by the holding sheet 60 and does not move on the covering sheet 58, uneven distribution of the absorption capacity is less likely to occur. In particular, in order to prevent the superabsorbent polymer particles 54 from moving on the holding sheet 80, an adhesive hot melt adhesive or the like can be applied on the holding sheet 80 in advance. Alternatively, the upper surface of the holding sheet 80 (surface toward the use surface side) may be a rough surface to prevent the superabsorbent polymer particles 54 from moving on the holding sheet 80. Examples of the roughening or fluffing means for this purpose include a non-net surface that is not a net surface during the production of the nonwoven fabric, a marble process, a needle punch process, and a brushing process.
As shown in FIG. 2, the holding sheet 80 may be provided only below the absorber 56, or may be wound up and extended to the upper surface of the absorber 56 through the side surface of the absorber 56, although not shown. It is also possible to use a plurality of holding sheets 80 in a stacked manner.
The above example is an example in which the holding sheet 58 is provided between the absorber 56 and the back side portion of the covering sheet 58, but the holding sheet may be on the back side from the covering sheet 58 (its form is In short, if a holding sheet is provided on the back surface side with respect to the absorber 56, the point is that the sensation of discomfort when touched from the back surface of the product is reduced or not caused.

(Fastening piece)
The fastening piece 130 has a base portion of a fastening base material 130C made of plastic, polylaminated nonwoven fabric, paper, or the like joined to a diaper, and a hook element 130A of a mechanical fastener is provided as a locking portion for the ventral side at the tip side portion. ing. The hook element 130A is bonded to the fastening substrate 130C by an adhesive so as not to be peeled off. The hook element 130A has a large number of engaging protrusions on the outer surface side thereof. The shape of the engaging protrusion is (A) Le-shaped, (B) J-shaped, (C) Mushroom-shaped, (D) T-shaped, (E) Double J-shaped (J-shaped And the like may be any shape. Instead of the hook element 130 </ b> A, an adhesive layer can be provided as a locking portion of the fastening piece 130.
When the diaper is worn, the fastening piece is locked at a proper position on the outer surface of the abdominal side F with the back side flap portion BF overlapped on the outside of the abdominal side flap portion FF. The position and size of the fastening portion of the fastening piece 130 can be arbitrarily determined. In a normal case, the locking portion is a rectangular range having a height of 20 to 80 mm and a width of 150 to 300 mm, and a distance in the height direction between the upper end edge and the ventral upper edge F1 is 0 to 60 mm, particularly 20 to 50 mm. And it is preferable to set it as the center of the width direction of a product.
It is preferable to provide a target tape 74 at the locking position of the fastening piece 130 on the ventral side F in order to facilitate locking. As the target tape 74, when the hook portion is the hook element 130A, a tape having a large number of loop yarns on which the engaging projections of the hook element are entangled can be used. A film having a smooth surface that is rich in properties can be used.
Further, when the fastening portion of the fastening piece 130 on the ventral side F is made of a nonwoven fabric, for example, when the exterior sheet 12 of the illustrated form is made of a nonwoven fabric, and the fastening portion of the fastening piece 130 is the hook element 130A, The target tape 74 can be omitted, and the hook element 130A can be entangled with the nonwoven fabric of the exterior sheet 12 and locked.

(Fixing the top sheet)
As shown in detail in FIG. 3, in order to fix the top sheet 30, the width based on both side edges in the width direction of each transmission hole group (in the illustrated form, the width direction central region 31, the left side region and the right side regions 33, 33). In the first to third ranges 35 to 37 within ± 10 mm in the direction, the top sheet 30 is a member on the back side thereof (in the illustrated embodiment, the intermediate sheet 40, the absorbent element 50, and the liquid-impermeable sheet 11. The same applies hereinafter. .) Is provided at a predetermined interval, and an adhesive such as a hot-melt adhesive that fixes the top sheet 30 to a member on the back surface side thereof is not used. That is, in the first to third ranges, the top sheet 30 is fixed only by welding the materials. Further, the top sheet 30 is outside the first to third ranges 35 to 37, and the portion having each transmission hole group (the width direction central region 31, the left region and the right region 33, 33 in the illustrated embodiment) is the back surface. It is not fixed to the side member.
Therefore, the portion of the top sheet 30 having each permeation hole group is fixed in width by the welded portions M and M on both sides thereof, and the crushing of the permeation holes H is suppressed, and at the portion between the welded portions M and M, Since a gap is formed between the portion having the permeation hole H and the member on the back side (mainly the intermediate sheet 40 in the case of the illustration), watery feces etc. are easily taken in through the permeation hole H. Here, the reason why the first to third ranges 35 to 37 are set within ± 10 mm in the width direction with respect to the respective reference side edges is due to consideration of a deviation inevitably generated when the welded portion M is formed. The more preferable range is within ± 5 mm, and the further preferable range is within ± 2.5 mm. In particular, the welded portion M and the permeation hole H are close to each other in the width direction but do not overlap (in other words, each range 35 to 37). The welded portion M is located outside the reference side edge in the width direction).
In order to improve the fixing strength of the top sheet 30 in portions other than the portions having the respective through hole groups and the welded portions M, for example, the width direction intermediate portion 38 of the left intermediate region 32 and the width direction intermediate portion 38 of the right intermediate region 32. Further, the intermediate region welded portion M2 can be provided or can be fixed by using an adhesive such as a hot melt adhesive in place of the intermediate region welded portion M2.
The welded part M and the intermediate region welded part M2 can be formed by an appropriate method such as ultrasonic welding, heat sealing, heat embossing, or the like as long as joining by material welding is possible. At the time of manufacture, the top sheet 30 and the back side member thereof can be superposed on each other by performing a joining process such as ultrasonic welding.
The planar shape of the welded portion M can be an appropriate shape such as a circle, an ellipse, an oval shape, a cocoon leaf shape, a polygonal shape, and the length ML in the front-rear direction is usually 1 to 10 mm. It is preferably an elongated shape (oval shape, oval shape, leaf shape) having a width direction length MW shorter than the front-rear direction length ML.
The area of the welded part M can be determined as appropriate, but is preferably 0.7 to 40 mm ² , particularly preferably ¹ to 15 mm ² . If the welding area is too small, it is difficult to secure the fixing strength of the top sheet 30, and if too large, the welding part M and the permeation hole H are likely to overlap in the case of the welding part M in the first to third ranges 35 to 37. Become.
The number of welded portions M can be determined as appropriate. As shown in the figure, the welded portions M are arranged in such a manner that the welded portion rows are arranged at predetermined intervals in the width direction. In the case of the above-described arrangement and the above-described welding area, the interval DY in the front-rear direction of the welding part M in the welding part row in each range 31 to 33 is preferably 5 to 30 mm, and preferably 5 to 15 mm. Is more preferable. In the case where a plurality of rows of welded portions M and M2 are provided in each of the ranges 31 to 33, the width direction distance DX between the rows is preferably 2 to 15 mm, and more preferably 4 to 10 mm. If the interval between the welded portions M is too wide, the permeation holes are liable to be crushed, and if it is too narrow, the texture becomes hard. In addition, the arrangement pattern of the welding part M in each range 35-37 is set as the row-like arrangement | positioning by which the welding part M was provided in a line at equal intervals along the front-back direction like the example of illustration, and a space | interval is set | placed in the width direction. In the case where a plurality of rows are provided, a staggered arrangement (illustrated example), a lattice (matrix) arrangement, or other regular or irregular arrangement may be employed.
The welded portion M and the intermediate region welded portion M2 can have different shapes, dimensions, and arrangement intervals depending on the position in the width direction. As one preferable form, as shown in FIG. 4, among the welded portions M provided in the first to third ranges 35 to 37, on the left side in the width direction of the transmission hole group serving as a reference for each range 35 to 37. As the welded portion M provided moves away from the permeation hole group to the left in the width direction, and the welded portion M provided on the right side in the width direction increases in length in the front-rear direction, respectively. A form having a shape is proposed.
In this embodiment, the area occupied by the welded portion M increases as it moves away from the side edge of the reference permeation hole group in the width direction. Therefore, even if the top sheet 30 is displaced in the width direction in the welding step, the welded portion M and the permeated portion are transmitted. The hole H hardly overlaps, and even if it overlaps, the area is small. In addition, since the area occupied by the welded portion M increases as the distance from the side edge of the reference transmission hole group increases, the fixing strength by the welded portion M increases as the distance from the side edge of the transmission hole group increases. It is possible to compensate for the decrease in the fixing strength caused by the above.
Further, the intermediate region welded portion M2 can be provided in the same manner as the welded portion M provided in the first to third ranges including the shape, area, arrangement interval, arrangement pattern, and the like, and is the same as the welded portion M. The shape, area, arrangement interval, arrangement pattern, and the like may be used, but they may be different. As one preferable form, as shown in FIG. 5, the area of the intermediate region welded portion M2 can be made larger than the welded portion M provided in the first range to the third range 35-37. Further, as shown in FIG. 5, the intermediate region welded portion M2 of the left intermediate region 32, the welded portion M provided in the first to third ranges 35 to 37 adjacent to both sides thereof, and the right intermediate region 32. The intermediate region welded portion M2 and the welded portions M provided in the first to third ranges 35 to 37 adjacent to both sides of the intermediate region welded portion M2 have a larger area as they are closer to the center in the width direction of each intermediate region 32. Yes.
Thus, by making the area of the intermediate region welded portion M2 larger than the welded portion M provided in the first to third ranges 35 to 37, the fixing strength of the topsheet 30 can be improved, The drawing speed of the liquid is further increased, and further, the left intermediate region and the right intermediate region 32, 32 to which pressure is applied by the top of the buttock are welded in a larger area, so that the reversal in that portion is further reduced.

(Top sheet punching method)
The top sheet 30 having the permeation holes H is formed by punching the perforation hole forming portion into a predetermined shape, perforating while being melted by a heat roller provided with a plurality of protrusions (special table 2002-512909), negative pressure A method of perforating while forming a three-dimensional taper by suction stretching heat treatment with an open conveyor (Patent No. 2812340), or forming a slit along a predetermined direction (front-rear direction, width direction, etc.) at a transmission hole forming position It can be manufactured by a method (Japanese Patent Laid-Open No. 11-253490) in which the sheet is later stretched in a direction perpendicular to the slit and fixed to the member on the back side (intermediate sheet 40 or absorbent element 50) with the slit expanded. . Each of these methods has advantages, but has the following disadvantages. That is, the punching method generates waste material, the melt drilling method hardens the periphery of the opening, and the method of forming a three-dimensional taper is a method in which the opening is easily crushed when pressure in the thickness direction is applied, and the film is stretched after the slit. Then, when the diaper is bent, the extension of the opening is relaxed and it becomes easy to close. In the present invention, after forming a slit along the front-rear direction at the transmission hole forming position, the sheet is stretched in the width direction, and the method of adhering to the member on the back surface side in the expanded state is combined as follows. It is most preferable, and this makes it possible to exhibit excellent performance while eliminating the above disadvantages.
After forming a slit along the front-rear direction at the transmission hole formation position, the sheet is stretched in the width direction, and the slit is expanded to form an opening. And the fiber spacing is widened, so that it is soft and excellent in liquid permeability. However, as described above, in order to secure a wide space for holding stool on the back side of the top sheet 30, if the top sheet 30 and the back side member are not fixed at almost the entire width, the opening of the diaper is bent and the opening is stretched. It relaxes and becomes easier to close. On the contrary, if it adheres to almost the entire surface of the sheet, a space for holding feces cannot be formed on the back side of the top sheet 30. Therefore, it is preferable to take a form of fixing at a constant interval in the width direction. In the present invention, since the left and right intermediate areas are provided as non-perforated areas instead of providing the perforated areas almost at the full width of the sheet, it is possible not only to prevent adherence of excrement to the buttocks due to reversing, By fixing the top sheet 30 and the member on the back side using the intermediate region (and both sides of the top sheet 30), the top sheet 30 can be firmly fixed while maintaining the opening state of the transmission holes H. It becomes possible. In this case, it is preferable to fix the area in the vicinity of both side edges in the width direction of each transmission hole group of the top sheet 30 because the open state of the transmission holes H can be stably maintained. It is preferable to use welding by the welding part M.

  The present invention is applied to a disposable diaper.

It is an expanded state top view of a tape type disposable diaper. It is the BB sectional view taken on the line of FIG. It is a principal part enlarged plan view of FIG. It is a principal part enlarged plan view which shows another example of a welding part. It is a principal part enlarged plan view which shows another example of a welding part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Absorbent main-body part, 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 30 ... Top sheet, 31 ... Width direction center area, 32 ... Left middle area, Right middle area, 33 ... Left area, Right area, 34 ... side edge region, 35 ... first range, 36 ... second range, 37 ... third range, 40 ... intermediate sheet, 50 ... absorbent element, 52 ... fiber, 54 ... superabsorbent polymer particles, 56 ... Absorber, 58 ... Cover sheet, 60 ... Barrier cuff, 64 ... Barrier sheet, 80 ... Holding sheet, H ... Permeation hole, M, M2 ... Welded part.

Claims (6)

An absorbent element is interposed between the liquid-permeable top sheet forming the body-side surface and the liquid-impermeable sheet located on the outer surface side, and the crotch is formed from the upper edge of the ventral side along the center in the width direction. In a disposable diaper having an absorbent main body extending to the upper edge of the street back side,
The top sheet has a width direction central region extending from the front end to the rear end through a portion corresponding to the crack, and is located on the left side and the right side of the width direction central region, respectively, and the top portion and the right side ridge portion of the left heel portion, respectively. A left intermediate region and a right intermediate region extending from the front end to the rear end through a portion corresponding to the top of the left side, and a left side extending from the front end to the rear end along the left side of the left intermediate region and the right side of the right intermediate region, respectively. An area and a right side area, and a left side edge area and a right side edge area extending from the front end to the rear end along the left side of the left side area and the right side of the right side area, respectively.
The entire width direction of at least the portion corresponding to the crack in the front-rear direction of the central region in the width direction, the entire width direction of the portion corresponding to the portion located on the left side of at least the top of the flange in the front-rear direction of the left region. And a plurality of transmission holes are drilled at predetermined intervals in each of the entire width direction of the portion corresponding to the width direction right side of the top of the flange portion in the front-rear direction of the right region, and the left side At least a portion corresponding to the top of the flange in the intermediate region, a portion corresponding to at least the top of the flange in the right intermediate region, and the left side edge region and the right side edge region are not perforated. Without
A first range within ± 10 mm in the width direction with reference to both side edges of the transmission hole group in the central region in the width direction, and within ± 10 mm in the width direction with reference to both side edges in the width direction of the transmission hole group in the left region The top sheet is fixed to a member on the back surface side in each of the second range and the third range within ± 10 mm in the width direction with reference to both side edges in the width direction of the transmission hole group in the right region. A plurality of welded portions are provided at predetermined intervals, and an adhesive for fixing the top sheet to a member on the back surface side thereof is not used, and the first range, the second range, and the third range are not used. Outside the range, the width direction central region, the left region and the right region are not fixed to the member on the back side,
A disposable diaper characterized by that.   The transmission hole is formed by forming a slit along the front-rear direction in the transmission hole forming position of the top sheet, and then extending the top sheet in the width direction and expanding the slit, and the top sheet includes the slit. The disposable diaper according to claim 1, wherein regions in the vicinity of both side edges in the width direction of each transmission hole group are fixed to a member on the back surface side of the top sheet in an enlarged state. The top sheet is a non-woven fabric having a fineness of raw material fibers of 1.0 to 3.0 dtex and a fiber basis weight of 10 to 30 g / m ² .
The arrangement of the transmission holes is an arrangement in which transmission hole rows in which the transmission holes are arranged at a predetermined interval in the front-rear direction are provided at a predetermined interval in the width direction,
The arrangement of the welded portions is an arrangement in which the welded portion rows in which the welded portions are arranged at predetermined intervals in the front-rear direction are provided at predetermined intervals in the width direction,
The opening area of the transmission holes is 0.8 to 180 mm ² , the width direction interval of the transmission hole rows in each of the width direction central region, the left side region, and the right side region is 1 to 5 mm, and the inside of the transmission hole row The interval in the front-rear direction of the through holes is 1 to 10 mm,
The area of the welded portion is 0.7 to 40 mm ² , the interval in the width direction of the welded portion row is ² to 15 mm, and the interval in the front-rear direction of the welded portion in the welded portion row is 5 to 30 mm.
The disposable diaper according to claim 1 or 2. Of the first range, the occupation area of the welded portion on the left side in the width direction of the transmission hole group in the central region in the width direction increases as the distance from the transmission hole group in the central region in the width direction increases to the left in the width direction. Among them, the area occupied by the welded portion on the right side in the width direction of the transmission hole group in the central region in the width direction is larger as it moves away from the transmission hole group in the central region in the width direction on the right side in the width direction,
Of the second range, the area occupied by the welded portion on the left side in the width direction of the transmission hole group in the left side region is larger as the distance from the transmission hole group in the left side region to the left side in the width direction increases. The area occupied by the welded portion on the right side in the width direction of the transmission hole group in the region is larger as the distance from the transmission hole group in the left region is increased to the right in the width direction,
Of the second range, the area occupied by the welded portion on the left side in the width direction of the permeation hole group in the right region increases as it moves away from the permeation hole group in the right region toward the left side in the width direction. The area occupied by the welded portion on the right side in the width direction of the permeation hole group of the region is larger as it moves away from the permeation hole group of the right region to the right side in the width direction,
The disposable diaper of any one of Claims 1-3. Of the welded portions provided in the first range, the welded portion provided on the left side in the width direction of the transmission hole group in the central region in the width direction is front and rear as the distance from the transmission hole group in the central region in the width direction increases to the left in the width direction. The weld portion provided on the right side in the width direction of the transmission hole group in the central region in the width direction among the weld portions provided in the first range has a shape having a large direction length. It has a shape in which the length in the front-rear direction increases as it moves away from the transmission hole group to the right in the width direction,
Of the welded portions provided in the second range, the welded portion provided on the left side in the width direction of the transmission hole group in the left region has a length in the front-rear direction as it moves away from the transmission hole group in the left region in the width direction left side. Of the welded portions provided in the second range, the welded portion provided on the right side in the width direction of the transmission hole group in the left region is on the right side in the width direction from the transmission hole group in the left region. It has a shape in which the length in the front-rear direction increases as it moves away,
Of the welded portions provided in the third range, the welded portion provided on the left side in the width direction of the transmission hole group in the right region has a longitudinal length as it moves away from the transmission hole group in the right region in the width direction left side. Of the welded portions provided in the third range, the welded portion provided on the right side in the width direction of the transmission hole group in the right region is located on the right side in the width direction from the transmission hole group in the right region. It has a shape in which the length in the front-rear direction increases as it moves away,
The disposable diaper of any one of Claims 1-3. A plurality of intermediate region welded portions that fix the top sheet to members on the back surface side of the left intermediate region and the right intermediate region outside the first range, the second range, and the third range, respectively. Are provided at predetermined intervals,
The area of the intermediate region welded portion is larger than the welded portions provided in the first range, the second range, and the third range,
The disposable diaper of any one of Claims 1-3.

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