JP7488049B2 - Pants-type disposable diapers - Google Patents

Description

The present invention relates to a pants-type disposable diaper that prevents a decrease in adhesive strength of the side seal.

A pants-type disposable diaper comprises an outer body having a front and a rear body, and an inner body including an absorbent body fixed to the inner surface of the outer body. The front and rear bodies of the outer body are joined on both sides to form side seals, thereby forming a waist opening and a pair of left and right leg openings.

When a wearer of a pants-type disposable diaper urinates a large amount, the absorbent body absorbs the urine and increases in weight, causing the crotch area of the diaper to sag downward. This can result in a gap between the wearer's skin and the diaper, which can lead to urine leakage. To prevent the fit of the diaper from decreasing after urination, diapers with curved elastic members around the legs are manufactured and sold. These curved elastic members are used to pull up the crotch area of the diaper, preventing urine leakage.

In the diaper manufacturing process, it is difficult to apply adhesive directly to the curved elastic member itself. For example, the curved elastic member passes through a positioning guide, and the positioning guide moves back and forth in a direction perpendicular to the line direction to form a curved shape. Therefore, if adhesive is applied directly to the curved elastic member, there is a risk that the adhesive will splash onto the line when the positioning guide moves back and forth. For this reason, for example, a method is adopted in which adhesive is applied to the upper surface of the lower sheet of two cloth-like sheets that form the base of the outer body, and then the curved elastic member is placed on the applied adhesive, and the upper sheet is then placed on top of that, and the curved elastic member is sandwiched between the upper and lower sheets, and then pressed from above and below with rolls to hot melt bond them. After the curved elastic member is bonded between the two sheets in this way, the two cloth-like sheets are cut at predetermined intervals in the transverse direction (the direction perpendicular to the sheet flow direction) to create individual diaper prototypes. When the sheet is cut, the curved elastic member is also cut at the same time, but because the diameter of the curved elastic member is generally small, the contact area between the curved elastic member and the sheet is small and the adhesion is not strong, which causes the end of the curved elastic member to be easily pulled inward in the width direction of the diaper. When the curved elastic member is pulled in, it becomes difficult for the contractile force to act on the width direction end of the diaper, which reduces the fit of the diaper at the width direction end.

The following Patent Document 1 is an example of a prior art document related to the present invention. Patent Document 1 discloses an absorbent article in which leg elastic members for forming leg gathers are arranged in a stretched state. The leg elastic members are cut at the crotch area so that elastic stretchability is not exhibited in the area where the absorbent body is present. A specific area of the leg elastic member that does not exhibit elastic stretchability is fixed to a constituent material of the absorbent article by a second fixing means.

JP 2002-035030 A

In order to solve the above problem, a method of applying a different adhesive to the end of the curved elastic member to increase the adhesive strength of the curved elastic member is considered. However, in normal cases, the end of the curved elastic member is located at the side seal portion, so if a different adhesive is applied to the end of the curved elastic member, the amount of adhesive applied to the side seal portion will increase. The adhesion of this side seal portion is often performed by an adhesion method different from that used for the elastic stretch member described above, for example, ultrasonic adhesion. At this time, if a large amount of adhesive is applied between the two sheets when performing ultrasonic adhesion, there is a problem that the ultrasonic waves are difficult to transmit, and the adhesive strength of the side seal portion is likely to decrease. In addition, when ultrasonically bonding the side seal portion, there is a tendency that the seal strength is higher if there are no impurities between the upper and lower sheets. Since the adhesive of the curved elastic member is also included in the above-mentioned impurities, there is a problem that it is better to reduce the amount of adhesive in the side seal portion as much as possible in consideration of increasing the adhesive strength of the side seal portion. In addition, if the amount of adhesive in the side seal portion is large, the adhesive may seep out from the outer surface of the sheet located at the side seal portion and adhere to the conveyor used to transport the sheet in the manufacturing device. Furthermore, because there is a large amount of adhesive in the side seal area, the sheet loses its softness in the side seal area, which can cause discomfort when this area comes into contact with the wearer's skin.

The main objective of the present invention is to provide a pants-type disposable diaper that prevents the ends of the elastically stretchable member from being pulled in and prevents a decrease in the adhesive strength of the side seals.

The aspect for solving this problem is as follows.
<First aspect>
An exterior body that forms a front body and a back body,
Both side portions of the exterior body in the front body and both side portions of the exterior body in the back body are joined to form side seal portions, thereby forming a waist opening and a pair of left and right leg openings,
A curved elastic member is bonded to at least one of the front body and the rear body of the exterior body by an adhesive, the curved elastic member extending from one side seal portion to the other side seal portion,
In the side seal portion,
the amount of the adhesive applied to the region where the curved elastic member is disposed is greater than the amount of the adhesive applied to the region away from the region where the curved elastic member is disposed;
A pants-type disposable diaper characterized by:

(Action and Effect)
The pants-type disposable diaper of the first aspect is characterized in that in the side seal portion, the amount of adhesive applied to the area where the curved elastic member is arranged is greater than the amount of adhesive applied to an area away from the area where the curved elastic member is arranged.

By applying a larger amount of adhesive to the area of the side seal where the curved elastic member is located, the adhesion between the end of the curved elastic member and the outer body becomes stronger than with conventional products. As a result, the end of the curved elastic member is less likely to be pulled inward in the width direction of the diaper than with conventional products.

The pants-type disposable diaper of the first embodiment is also characterized in that the amount of adhesive applied to the side seal portion away from the area where the curved elastic member is arranged is reduced. As mentioned above, if a large amount of adhesive is applied to the side seal portion, the adhesive strength of the side seal portion is reduced. Therefore, in this embodiment, the amount of adhesive applied to the side seal portion away from the area where the curved elastic member is arranged is reduced, thereby preventing the adhesive strength of the side seal portion from decreasing. At the same time, the possibility of adhesive leaking from the outer end of the side seal portion in the width direction can be reduced. Furthermore, the possibility of adhesive leaking onto the outer surface of the side seal portion and hardening, and causing discomfort when the wearer touches the hardened part, can be reduced.

<Second aspect>
In the side seal portion,
The curved elastic members are arranged linearly along the width direction,
In the region where the curved elastic member is disposed, a region where the amount of adhesive applied is large is formed linearly along the width direction.
The pants-type disposable diaper according to the first aspect.

(Action and Effect)
The pants-type disposable diaper of the second aspect is characterized in that the curved elastic members are arranged linearly along the width direction, and in the area where the curved elastic members are arranged, an area where a large amount of adhesive is applied is formed linearly along the width direction.

The shorter the length of the curved elastic member placed in the side seal, the better. In the side seal, more adhesive is applied to the area where the curved elastic member is placed, so the longer the length of the curved elastic member placed in the side seal, the greater the area to which adhesive is applied. This results in a decrease in the adhesive strength of the side seal.

In the side seal section, the length of the curved elastic member placed in the side seal section is shorter when the curved elastic member is placed in a straight line along the width direction than when it is placed diagonally. Therefore, in this embodiment, the curved elastic member is placed in a straight line along the width direction in the side seal section. At the same time, an area where a large amount of adhesive is applied is formed in a straight line along the width direction in the area where the curved elastic member is placed. In other words, the amount of adhesive applied is small in areas away from the area where a large amount of adhesive is applied.

By configuring in this way, it is possible to minimize the amount of adhesive applied to the side seal portion to adhere the curved elastic member. As a result, it is possible to prevent a decrease in the adhesive strength of the side seal portion. Even if the amount of adhesive applied to adhere the curved elastic member is reduced in this way, the amount of adhesive applied in the area where the curved elastic member is arranged is large, so the effect of preventing the curved elastic member from being pulled in is high.

<Third aspect>
A region where the amount of adhesive applied is large is formed linearly along the width direction from one end to the other end of the pants-type disposable diaper in the width direction.
The pants-type disposable diaper according to the second aspect.

(Action and Effect)
The pants-type disposable diaper of the third aspect is characterized in that an area where the amount of adhesive applied is large is formed linearly along the width direction from one end portion to the other end portion of the pants-type disposable diaper in the width direction.

In the manufacture of pants-type disposable diapers, it is not easy to form an area with a large amount of adhesive applied only in the side seal portion of the diaper, without providing an area with a large amount of adhesive applied in the middle portion of the width direction of the diaper. The adhesive is applied to a sheet (the sheet that constitutes the outer body) that moves at high speed, and the amount of adhesive applied must be controlled intermittently to increase or decrease, and the area with a large amount of adhesive applied must match the area that will become the side seal portion. In the adhesive application process, the flow direction of the sheet (MD direction) is the same as the width direction of the diaper, and the direction that intersects with the flow direction of the sheet (MD direction) is called the CD direction.

In this embodiment, therefore, a region with a large amount of adhesive applied is formed linearly along the width direction from one end of the pants-type disposable diaper in the width direction to the other end. A diaper with this configuration can be manufactured, for example, by continuously applying a large amount of adhesive only to a certain portion in the CD direction. In this way, it becomes easier to manufacture diapers because there is no need to intermittently change the amount of adhesive applied. Furthermore, in an embodiment in which adhesive is applied intermittently, the timing for increasing the amount of adhesive applied may be off, resulting in defective products in which the side seal portion does not have an area with a large amount of adhesive applied. However, by configuring the diaper in this embodiment, it is possible to prevent such defective products from occurring.

<Fourth aspect>
The side seal portion has
The outer body of the front body and the outer body of the back body have bonded and non-bonded portions,
The area of the adhesive portion per unit area of the region in which the curved elastic member is arranged is
the area of the adhesive portion per unit area of the region away from the curved elastic member is larger;
The pants-type disposable diaper according to any one of the first to third aspects.

(Action and Effect)
The pants-type disposable diaper of the fourth aspect is characterized in that the side seal portion has bonded and non-bonded portions between the outer body of the front body and the outer body of the rear body, and the area of the bonded portion per unit area in the region where the curved elastic member is arranged is larger than the area of the bonded portion per unit area in the region away from the curved elastic member.

In the area where the curved elastic member is arranged, the amount of adhesive applied is increased to prevent the curved elastic member from being pulled in. If the amount of adhesive applied is large, there is a problem that the adhesive strength of the side seal part is weakened. In order to avoid such inconvenience, the area of the adhesive part per unit area of the front body exterior body and the rear body exterior body is increased in the area where the curved elastic member is arranged. In this way, by increasing the area of the adhesive part of the front body exterior body and the rear body exterior body, the adhesive strength of the side seal part can be strengthened. For example, ultrasonic bonding can be used to bond the side seal part of the front body exterior body and the rear body exterior body, but in the area where the curved elastic member is arranged, the adhesive pattern can be a bar pattern with strong adhesive strength. This bar pattern refers to, for example, a shape of one adhesive part that is a horizontally long rectangle extending along the width direction, and multiple rectangular adhesive parts are intermittently arranged in a line along the vertical direction of the diaper. Of course, it is not limited to such a bar pattern, and other patterns may be used as long as the area of the adhesive part per unit area is large. For example, when using a dot pattern in which the adhesive portions are shaped like dots, the area of the adhesive portions per unit area can be increased by increasing the number of adhesive portions per unit area or by increasing the size of each adhesive portion.

Conversely, in areas away from the area where the curved elastic members are arranged, the area of the adhesive parts per unit area of the front and back outer bodies is reduced. There is no particular limitation on the method for reducing the area of the adhesive parts. For example, when the dot pattern is used for the adhesive parts, the area of the adhesive parts per unit area can be reduced by reducing the number of adhesive parts (dot parts) per unit area or by reducing the size of each adhesive part (dot part). By reducing the area of the adhesive parts per unit area in areas away from the area where the curved elastic members are arranged, there is an advantage that the side seal part becomes easier to tear after the diaper is used.

Note that the area of the adhesive portion per unit area in the region where the curved elastic member is arranged is large means that the area of the adhesive portion per unit area in the region away from the curved elastic member is larger when comparing the "region where the curved elastic member is arranged" with the "region away from the curved elastic member". Similarly, the area of the adhesive portion per unit area in the region away from the curved elastic member is small means that the area of the adhesive portion per unit area in the region away from the curved elastic member is smaller when comparing the "region where the curved elastic member is arranged" with the "region away from the curved elastic member". In other words, it refers to the relative size when comparing the "region where the curved elastic member is arranged" with the "region away from the curved elastic member".

As described above, the present invention provides a pants-type disposable diaper that prevents the ends of the elastic stretchable member from being pulled in and prevents a decrease in the adhesive strength of the side seal portion.

1 is a plan view (inner surface side) of a pants-type disposable diaper in an unfolded state. 1 is a plan view (outer surface side) of a pants-type disposable diaper in an unfolded state. This is a cross-sectional view taken along the line CC of FIG. 2 is a cross-sectional view taken along line AA of FIG. 1. This is a cross-sectional view taken along line B-B of FIG. FIG. 2 is a perspective view of the pants-type disposable diaper in a worn state. FIG. 4 is a plan view showing an example of an application pattern of adhesive for bonding waist elastic members and hip-area elastic members. FIG. 4 is a plan view showing an application pattern of adhesive for bonding curved elastic members and waist-area elastic members. 13 is a plan view showing a portion where a large amount of adhesive is applied to bond the curved elastic member. FIG. 10A and 10B are enlarged views of part M in Fig. 9. (10A) and (10B) are different embodiments, and the area where the amount of adhesive applied is large is different. 11A is an embodiment different from that of FIG. 10A and FIG. 10B, and the area where the amount of adhesive applied is large is different. (11B) is an explanatory diagram of the adhesive portion between the exterior body of the front body and the exterior body of the back body. (12A) (12B) This is a modified example of 11B, in which the adhesive parts of the outer body of the front body and the outer body of the back body are different. FIG. 13 is a plan view of a pants-type disposable diaper in an unfolded state, showing a modified example of an area where a large amount of adhesive is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described in detail with reference to the accompanying drawings. Note that the term "elongation rate" refers to a value when the natural length is taken as 100%.
1 to 6 show an embodiment of a pants-type disposable diaper 1. This pants-type disposable diaper 1 (hereinafter also simply referred to as a diaper) has an exterior body 20 forming a front body F and a rear body B, and an interior body 10 fixed and integrated to the inner surface of the exterior body 20, and the interior body 10 is formed by interposing an absorbent body 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back side sheet 12. During manufacture, the back surface of the interior body 10 is fixed to the inner surface (upper surface) of the exterior body 20 by a joining means such as a hot melt adhesive G, and then the interior body 10 and the exterior body 20 are folded at the center in the vertical direction, which is the boundary between the front body F and the rear body B, and both sides are joined to each other by ultrasonic bonding or the like (thermal welding or a hot melt adhesive may also be used) to form a side seal portion 21, thereby forming a pants-type disposable diaper having a waist opening and a pair of left and right leg openings.

(Example of exterior structure)
3 to 5, the exterior body 20 is a two-layer nonwoven fabric sheet consisting of an upper nonwoven fabric 20A and a lower nonwoven fabric 20B (i.e., in this embodiment, the lower nonwoven fabric is the outermost nonwoven fabric), and various elastic members are disposed between the upper nonwoven fabric 20A and the lower nonwoven fabric 20B, and between the nonwoven fabrics of the folded-back portion 20C formed by folding back the lower nonwoven fabric 20B to the inner side at the waist opening edge, to impart stretchability. The planar shape is a pseudo-hourglass shape as a whole, due to concave leg lines 29 formed on both middle sides to form leg openings.

In particular, the illustrated exterior body 20 has, as elastic members, a waist elastic member 24 arranged near the waist opening 23 in the expanded form shown in Figs. 1 and 2, and a plurality of waist elastic members 25 arranged in the width direction at intervals in the vertical direction on the front body F and the back body B. In addition to the waist elastic member group 25, the front body F and the back body B each have a plurality of curved elastic members 26, 28 arranged at intervals without crossing each other, which extend in a curved pattern from one side seal portion 21 along one leg opening toward the crotch portion, cross the crotch portion, and reach the other side seal portion 21 along the other leg opening. These elastic members 24 to 28 are fixed in a state in which they are stretched at a predetermined stretch rate along their respective extension directions. Note that the exterior body 20 does not have so-called leg elastic members that continue from the side seal portion 21 of the front body F to the side seal portion 21 of the back body B along the leg line 29.

The waist elastic member 24 is a thin elastic member such as multiple strands of rubber thread arranged at intervals in the vertical direction near the edge of the waist opening within the range of the side seal portion 21 where the front body F and the back body B are joined, and is intended to fit the diaper to the body by applying an elastic force that tightens the waist area of the body. In the illustrated example, rubber thread is used for this waist elastic member 24, but a tape-like elastic member, for example, may also be used. In addition, the waist elastic member 24 in the illustrated form is sandwiched between the nonwoven fabrics of the folded-back portion 20C of the lower nonwoven fabric 20B in the waist area, but it may also be sandwiched between the upper nonwoven fabric 20A and the lower nonwoven fabric 20B.

The waist elastic members 25 are elongated elastic members such as rubber threads arranged at intervals in the vertical direction within the side seal portion 21, generally from the top to the bottom, and are intended to provide a stretching force in the width direction to the waist areas of the front body F and the back body B, respectively, to fit the diaper closely to the body. The boundary between the waist elastic members 24 and the waist elastic members 25 does not necessarily have to be clear. For example, even if the number of elastic members arranged in the width direction at intervals in the vertical direction on the front body F and the back body B cannot be specified, it is sufficient that some of the upper elastic members function as waist elastic members and the remaining elastic members function as waist elastic members.

In the back body B, the back curved elastic member 26 arranged separately from the waist elastic member 25 is an elongated elastic member such as rubber thread. The back curved elastic member 26 may be one piece, but preferably there are multiple pieces. In the illustrated example, there are three rubber thread elastic members, and these back curved elastic members 26 are arranged at intervals without crossing each other. This back curved elastic member group 26 is not arranged as a bundle of two or three elastic stretch members closely spaced apart, but is preferably arranged at intervals of 3 to 20 mm, preferably 6 to 16 mm, and preferably three or more, to form a predetermined stretch zone.

In the front body F of the outer body 20, the ventral curved elastic member 28 arranged separately from the waist elastic member group 25 is an elongated elastic member such as rubber thread. The ventral curved elastic member 28 may be a single piece, but preferably there are multiple pieces, and in the illustrated example there are three thread-like elastic members, and these ventral curved elastic members 28 are arranged at intervals without crossing each other. The ventral curved elastic member group 28 is also not arranged as a bundle of two or three elastic stretch members spaced closely together, but is preferably arranged at intervals of 3 to 20 mm, preferably 6 to 16 mm, and preferably three or more, to form a predetermined stretch zone.

In the illustrated example, the waist elastic member 25 and the curved elastic members 26, 28 arranged on the front body F and the back body B are continuously fixed to the outer body during manufacturing as shown in Figures 7 and 8, and then a part or all of the part overlapping with the inner body is cut into small pieces according to a predetermined cutting pattern CP to form a non-contraction part where the contraction force does not act (i.e., the part overlapping with the cutting pattern CP in Figures 7 and 8), and the part extending while curving to the side from this non-contraction part is a contraction part where the contraction force acts (i.e., the part to the side of the cutting pattern CP in Figures 7 and 8 where the waist elastic member 25 and the curved elastic members 26, 28 are continuously left). For this reason, the waist elastic member 25 and the curved elastic members 26, 28 are continuously provided from one side side seal portion 21 across the inner body 10 to the other (opposite) side side seal portion 21, and then a part or all of the part overlapping with the inner body is cut into small pieces. This makes it possible to further prevent the inner body (especially the absorbent body 13) from shrinking in the width direction. Of course, the waist elastic member 25 and the curved elastic members 26, 28 can also be arranged continuously across the inner body 10.

The above-mentioned outer body 20 can be manufactured by the techniques described in, for example, Japanese Patent Application Publication Nos. 4-28363 and 11-332913. In addition, to cut the curved elastic members 26, 28 on the inner body 10 and make them discontinuous, the cutting methods described in Japanese Patent Application Publication Nos. 2002-35029, 2002-178428, and 2002-273808 are preferably used.

Unlike the illustrated example, the curved elastic members may be provided only on either the front body F or the back body B. Also, when the curved elastic members 26, 28 are provided on both the front body F and the back body B, a configuration (not shown) in which some or all of the group of curved elastic members arranged on the front body F side crosses with some or all of the group of curved elastic members arranged on the back body B side can be adopted. However, as in the illustrated example, a configuration in which the group of curved elastic members 28 arranged on the front body F side and the group of curved elastic members arranged on the back body B side are vertically separated from each other at a vertically intermediate portion, particularly a position slightly biased toward the front body F, without crossing each other is preferable.

Furthermore, the curved elastic members 26, 28 do not have to be entirely curved, but may have some linear portions.

The stretch percentage of the elastic members 24-28 when fixed can be determined as appropriate, but in the case of a typical baby diaper, the waist elastic member 24 can be approximately 230-320%, the hip elastic member 25 can be approximately 230-320%, and the curved elastic members 26, 28 can be approximately 160-300%.

(Fixing of elastic member with hot melt adhesive)
The waist elastic member 24, hip elastic member 25 and curved elastic members 26, 28 are sandwiched between a pair of sheet layers 20A, 20B constituting the exterior body 20, and are adhered and fixed to these sheet layers 20A, 20B with a hot melt adhesive, and the amount of hot melt adhesive applied greatly affects the flexibility of the exterior body 20. Therefore, as shown in Fig. 7, it is preferable that the adhesive portion B1 for fixing the waist elastic member 24 and hip elastic member 25 is only at and near the position of the waist elastic member 24 and the position of the hip elastic member 25.

Figure 7 shows the hot melt adhesive application area B1 in the manufacturing process, where the hot melt adhesive B1 for fixing the waist elastic member 24 and the hip elastic member 25 to the two sheet layers 20A, 20B is applied substantially only to the locations of the elastic members 24, 25 and their vicinity. Such application of adhesive can be achieved by sandwiching the elastic members 24, 25, which have adhesive applied to their outer peripheral surfaces, between the two sheet layers 20A, 20B, and application of adhesive to the outer peripheral surfaces of such elastic members 24, 25 can be performed, for example, with a Nordson Surwrap nozzle.

Fig. 8 shows the hot melt adhesive application area B2 in the manufacturing process, and the curved elastic members 26, 28 are shown before cutting the portions that cross the inner body 10 as indicated by the two-dot chain lines. In Fig. 8, the waist elastic member 24 and the hip-area elastic member 25 are omitted for the sake of clarity. As shown in Fig. 8, the hot melt adhesive is applied to almost the entire surface of the disposable diaper (at the position of the application area B2). This is used to bond the upper nonwoven fabric 20A and the lower nonwoven fabric 20B, and also to the hip-area elastic member 25 and
It is used to adhere the curved elastic members 26, 28. In the initial process of manufacturing the diaper, the upper nonwoven fabric 20A and the lower nonwoven fabric 20B are cloth-like sheets, and since there is nonwoven fabric on the inside of the leg-around line 29 (the portion FH into which the wearer's legs are inserted), the adhesive is also applied to this portion FH, but this portion is cut off in a later process. The adhesive shown in Fig. 8 is generally applied to either the upper nonwoven fabric 20A or the lower nonwoven fabric 20B.

In the above, as shown in Figs. 7 and 8, it has been described that the diaper is manufactured by applying adhesive to both application areas B1 and B2. As shown in Fig. 10 (10A), the present invention is characterized in that, in applying adhesive to bond the curved elastic members 28, 26 (the ventral curved elastic member 28 in the front body F and the rear curved elastic member 26 in the rear body B), the amount of adhesive applied to the area B3 where the curved elastic members 28, 26 are arranged is greater than the amount of adhesive applied to the area B4 away from the area where the curved elastic members 28, 26 are arranged. In the following description, the area B3 where the curved elastic members 28, 26 are arranged is referred to as the arrangement area B3, and the area B4 away from the area B3 where the curved elastic members 28, 26 are arranged is referred to as the separation area B4. In the following description, the ventral curved elastic member 28 of the curved elastic members 28, 26 is described as an example, but the same applies to the rear curved elastic member 26.

In the embodiment of Figures 10 to 12, the widthwise length of the arrangement region B3 is indicated by N1, which is approximately the same as the overall width of the side seal portion 21 in the widthwise direction. On the other hand, the vertical length of the arrangement region B3 is indicated by P1. It is preferable that the lower end of the arrangement region B3 is located 0.5 to 10 mm below (to the crotch side) the upper end portion of the ventral curved elastic member 28U located closest to the crotch (in Figure 10A, this corresponds to the outer portion of the ventral curved elastic member 28; the same applies below) (i.e., U1 is 0.5 to 10 mm). The length of U1 is more preferably 0.5 to 8 mm, and even more preferably 0.5 to 5 mm. In addition, it is preferable that the length P1 is set to a position 0.5 to 10 mm above (ventrally) the upper end portion of the ventral curved elastic member 28T located most ventrally (corresponding to the outer portion of the ventral curved elastic member 28 in FIG. 10A; the same applies below) (i.e., T1 is 0.5 to 10 mm). The length of T1 is more preferably 0.5 to 8 mm, and even more preferably 0.5 to 5 mm.

On the other hand, the separation region B4 refers to a region that is separated from the dorsal curved elastic member 26 by a certain distance. Specifically, it is preferable to set the region B4 to a region that is 10 mm or more above (ventral side) from the upper end portion of the ventral curved elastic member 28T located at the most ventral side, more preferably to set the region B4 to a region that is 15 mm away, and even more preferably to set the region B4 to a region that is 20 mm or more away. Similarly, it is preferable to set the region B4 to a region that is 10 mm or more below (crotch side) from the upper end portion of the ventral curved elastic member 28U located at the most crotch side, more preferably to set the region B4 to a region that is 15 mm or more away, and even more preferably to set the region B4 to a region that is 20 mm or more away. In the embodiment of Figures 10 to 12, the lower end (crotch side end) of the separation region B4 is located at a position that is about 20 mm above (ventral side) from the upper end portion of the ventral curved elastic member 28T located at the most ventral side. That is, the distance P3 from the upper end of the ventral curved elastic member 28T located at the most ventral side to the lower end of the separation area B4 is about 20 mm. In the embodiment of Figures 10 to 12, the distance P2 from the upper end (ventral end) of the arrangement area B to the lower end (crotch end) of the separation area B4 is about 15 mm.

The widthwise length and vertical length of the separation region B4 are not particularly limited, but in the embodiment shown in Figs. 10 to 12, the widthwise length of the separation region B4 is approximately the same as the overall width of the side seal portion 21, and the vertical length of the separation region B4 is also the same as the overall width of the side seal portion 21. In other words, the shape of the separation region B4 is a square with a vertical length and a widthwise length that are approximately the same.

As described above, by increasing the amount of adhesive applied to the region B3 of the side seal portion 21 where the ventral curved elastic member 28 is arranged, the adhesion between the end of the ventral curved elastic member 28 and the nonwoven fabric (upper layer nonwoven fabric 20A and lower layer nonwoven fabric 20B) becomes stronger than in conventional products. As a result, it is possible to prevent the end of the ventral curved elastic member 28 from being pulled inward in the width direction of the diaper.

As mentioned above, if too much adhesive is applied to the side seal portion 21 to bond the ventral curved elastic member 28, the adhesive strength of the side seal portion 21 decreases. Therefore, in the present invention, the amount of adhesive applied to the area B4 of the side seal portion 21, which is away from the area where the ventral curved elastic member 28 is arranged, is reduced to prevent the adhesive strength of the side seal portion 21 from decreasing. At the same time, it is possible to reduce the possibility that the adhesive will leak from the widthwise outer end of the side seal portion 21, and to reduce the possibility that the adhesive will leak onto the outer surface of the side seal portion 21 and harden, causing discomfort to the wearer when he or she touches the hardened part.

Other Embodiments
In the embodiment of FIG. 10 (10A), the area where the amount of adhesive is large is the entire area of the arrangement area B3. However, the present invention is not limited to such an embodiment, and the area where the amount of adhesive is large may be a part of the arrangement area B3. For example, as shown in FIG. 10 (10B) and FIG. 11 (11A), the area where the amount of adhesive is large may be formed only on the periphery of the abdominal curved elastic member 28. By making the area where the amount of adhesive is large a part of the arrangement area B3, it is possible to further suppress the decrease in the adhesive strength of the side seal portion 21 compared to the embodiment of FIG. 10 (10A).

In the embodiment of FIG. 10 (10B), the regions B3sT, B3sM, and B3sU with a large amount of adhesive are formed in the ranges spaced apart from each other by a certain distance on the ventral side and the crotch side in the vertical direction, based on the positions of the ventral curved elastic members 28T, 28M, and 28U. For example, it is preferable to form the regions B3sT, B3sM, and B3sU with a large amount of adhesive in the ranges spaced apart by 10 mm on the ventral side and 10 mm on the crotch side, based on the positions of the ventral curved elastic members 28T, 28M, and 28U. In this case, the vertical lengths S1, S2, and S3 of the regions B3sT, B3sM, and B3sU with a large amount of adhesive are each 20 mm. It is more preferable that the range is 5 mm on the ventral side and 5 mm on the crotch side, and even more preferable that the range is 0.5 mm on the ventral side and 0.5 mm on the crotch side. If the vertical distance from the ventral curved elastic member 28 (the distance between the ventral side and the crotch side) is shorter than 0.5 mm, there is a problem that the ventral curved elastic member 28 is easily pulled in. On the other hand, if the vertical distance from the ventral curved elastic member 28 (the distance between the ventral side and the crotch side) is longer than 10 mm, there is a problem that the adhesive strength of the side seal portion 21 is easily reduced.

In the above description, the distance from the ventral curved elastic member 28 is the same on the ventral side and the crotch side, but it may be different. For example, the area B3sT, B3sM, and B3sU where the amount of adhesive applied is large may be a position 10 mm away from the ventral curved elastic member 28 and a position 5 mm away from the crotch side based on the ventral curved elastic member 28. When the distance from the ventral curved elastic member 28 to the ventral side and the distance from the ventral curved elastic member 28 to the crotch side are different, it is preferable to make the distance on the crotch side longer than the distance on the ventral side. When the ventral curved elastic member 28 is retracted, the end of the ventral curved elastic member 28 is retracted toward the crotch side, so by increasing the distance on the crotch side of the areas B3sT, B3sM, and B3sU where the amount of adhesive applied is large, the effect of suppressing the retraction of the ventral curved elastic member 28 is enhanced. Specifically, it is preferable that the distance to the ventral side is 7 mm and the distance to the crotch side is 8 mm, and it is even more preferable that the distance to the ventral side is 5 mm and the distance to the crotch side is 6 mm.

In the above description, the vertical lengths S1, S2, and S3 of the regions B3sT, B3sM, and B3sU, which have a large amount of adhesive applied, are the same distance, but they may be different distances. If the vertical lengths S1, S2, and S3 are different distances, it is preferable to make them longer for the regions located closer to the ventral side. That is, it is preferable to make the vertical length S1 of the region B3sT longer than the vertical length S2 of the region B3sM, and it is preferable to make the vertical length S2 of the region B3sM longer than the vertical length S3 of the region B3sU. Since the pulling force of the end of the ventral curved elastic member 28 toward the crotch side is stronger for the ventral curved elastic member 28 located closer to the ventral side, applying a larger amount of adhesive to the regions located closer to the ventral side makes it easier to suppress the pulling of the ventral curved elastic member 28. Specifically, it is preferable to make the length S1 10 mm to 16 mm, the length S2 8 mm to 16 mm, and the length S3 5 mm to 16 mm.

In the side seal portion 21, in the embodiment of FIG. 10 (10B), the ventral curved elastic member 28 is arranged in a straight line along the width direction, but in the embodiment of FIG. 11 (11A), the ventral curved elastic member 28 is arranged to extend diagonally upward from the inside to the outside in the width direction. Of these two embodiments, the embodiment of FIG. 10 (10B) is preferable to the embodiment of FIG. 11 (11A). When the ventral curved elastic member 28 is arranged diagonally in the side seal portion 21 as shown in FIG. 11 (11A), the length of the ventral curved elastic member 28 present in the side seal portion 21 becomes longer than the embodiment of FIG. 10 (10B). As a result, the vertical length of the areas B3sT, B3sM, and B3sU where the amount of adhesive applied is large must be increased, which results in a decrease in the adhesive strength of the side seal portion 21. Specifically, the vertical length S1 of region B3sT is shorter in FIG. 10 (10B) than in FIG. 11 (11A), the vertical length S2 of region B3sM is also shorter in FIG. 10 (10B) than in FIG. 11 (11A), and the vertical length S3 of region B3sU is also shorter in FIG. 10 (10B) than in FIG. 11 (11A).

(Adhesion mode of side seal portion 21)
As described above, the side seal portion 21 is bonded by ultrasonic bonding or the like (or by heat welding or a hot melt adhesive). In this case, the entire area of the side seal portion 21 may be bonded, but since the side seal portion 21 is often torn after the diaper is used, and taking into consideration the ease of tearing, it is preferable to bond only a part of the side seal portion 21. More specifically, it is preferable to provide a plurality of bonded portions E at intervals along the vertical direction.

In this case, it is preferable to change the adhesion area of the adhesion portion E of the side seal portion 21 depending on the vertical position of the diaper. More specifically, it is preferable to make the area of the adhesion portion E per unit area in the region B3 where the curved elastic members 28, 26 are arranged larger than the area of the adhesion portion E per unit area in the region B4 away from the curved elastic members 28, 26. In the following explanation, the ventral side where the ventral curved elastic member 28 is located will be described as an example with reference to Figures 11 (11B) and 12 (12A) (12B), but the same applies to the dorsal side where the dorsal curved elastic member 26 is located.

In the embodiment of FIG. 11 (11B), a plurality of adhesive portions E are provided to bond the outer body 20 of the front body F and the outer body 20 of the back body B. Each adhesive portion E is a horizontally long rectangular shape extending in the width direction, and is provided intermittently in the vertical direction from the abdominal side toward the crotch side. In addition, a non-adhesive portion Z is provided between adjacent adhesive portions E, E.

In the embodiment of FIG. 11 (11B), in the region B3 of the side seal portion 21 where the ventral curved elastic member 28 is arranged, the distance between the vertically adjacent adhesive portions E, E is shortened to increase the area of the adhesive portion E per unit area. Conversely, in the region B4 away from the region B3 where the ventral curved elastic member 28 is arranged, the distance between the vertically adjacent adhesive portions E, E is lengthened to reduce the area of the adhesive portion E per unit area. Here, the "long" and "short" distance between the vertically adjacent adhesive portions E, E means "long" and "short" in comparison between the region B3 and the region B4. Similarly, the "large" and "small" area of the adhesive portion E per unit area means "large" and "small" in comparison between the region B3 and the region B4. In FIG. 11 (11B), the adhesive portion E provided in the region B3 is indicated by the symbol E1, and the adhesive portion E provided in the region B4 is indicated by the symbol E2.

More specifically, in region B3, the separation distance between adjacent adhesive portions E1, E1 in the vertical direction (meaning the distance between the crotch side edge of adhesive portion E1a and the ventral side edge of adhesive portion E1b, assuming that adhesive portion E1a is on the ventral side and adhesive portion E1b is on the crotch side, and that adhesive portions E1a, E1b are adjacent to each other; the same applies below) is preferably 0.5 mm to 3.0 mm, more preferably 0.8 mm to 2.7 mm, and even more preferably 1.0 mm to 2.0 mm. If the separation distance is shorter than 0.5 mm, the side seal portion 21 may be difficult to tear. On the other hand, if the separation distance is longer than 3.0 mm, the adhesion between the exterior body 20 on the ventral side F and the exterior body 20 on the dorsal side B in region B3 may be insufficient. In region B3, the area of the adhesive portion E1 per unit area (a square with a vertical length of 10 mm and a width length of 10 mm; the same applies below) is preferably 15 mm ² to 50 mm ² , more preferably 16 mm ² to 35 mm ² , and even more preferably 20 mm ² to 35 mm ^2. If the area of the adhesive portion E1 per unit area in region B3 is smaller than 15 mm ² , there is a risk that the adhesion between the exterior body 20 on the ventral side F and the exterior body 20 on the dorsal side B will be insufficient. On the other hand, if the area of the adhesive portion E1 per unit area in region B3 is larger than 50 mm ² , there is a risk that the side seal portion 21 will be difficult to tear.

Furthermore, in region B4, the separation distance between adjacent adhesive portions E2, E2 in the vertical direction (meaning the distance between the crotch side edge of adhesive portion E2a and the ventral side edge of adhesive portion E2b when adhesive portion E2a is on the ventral side and adhesive portion E2b is on the crotch side and said adhesive portions E2a, E2b are adjacent to each other; the same applies below) is preferably 2 mm to 6 mm, more preferably 2.5 mm to 5 mm, and even more preferably 3 mm to 4 mm. If the separation distance is shorter than 2 mm, the side seal portion 21 may be difficult to tear. On the other hand, if the separation distance is longer than 6 mm, the adhesion between the exterior body 20 on the ventral side F and the exterior body 20 on the dorsal side B in region B4 may be insufficient. In region B4, the area of the adhesive portion E2 per unit area (a square with a vertical length of 10 mm and a width length of 10 mm; the same applies below) is preferably 10 ^mm2 to ²⁰ mm2, more preferably 13 ^mm2 to ¹⁷ mm2, and even more preferably 14 ^mm2 to ¹⁶ mm2. If the area of the adhesive portion E2 per unit area in region B4 is smaller than 10 ^mm2 , there is a risk that the adhesion between the exterior body 20 on the ventral side F and the exterior body 20 on the dorsal side B will be insufficient. On the other hand, if the area of the adhesive portion E2 per unit area in region B4 is larger than 20 ^mm2 , there is a risk that the side seal portion 21 will be difficult to tear.

Figure 12 (12A) is an embodiment different from Figure 11 (11B). In Figure 12 (12A), the area per unit of the adhesive portion E1 located in region B3 is made larger, and the area per unit of the adhesive portion E2 located in region B4 is made smaller. In this way, by changing the area per unit of the adhesive portion E between region B3 and region B4, the area per unit of the adhesive portion E in region B3 where the curved elastic members 28, 26 are arranged may be made larger than the area per unit of the adhesive portion E in region B4 away from the curved elastic members 28, 26. In Figure 12 (12A), the separation distance between adjacent adhesive portions E, E (meaning the distance between the crotch side edge of the adhesive portion Ea and the ventral side edge of the adhesive portion Eb when the adhesive portion Ea is on the ventral side and the adhesive portion Eb is on the crotch side, and the adhesive portions Ea, Eb are adjacent to each other. The same applies below) is all the same. In the embodiment shown in FIG. 12 (12A), the shape of the adhesive portion E1 in region B3 and the adhesive portion E2 in region B4 are circular. The diameter of this adhesive portion E1 is preferably 0.3 mm to 0.8 mm, more preferably 0.4 mm to 0.7 mm, and even more preferably 0.5 mm to 0.6 mm.

Also, FIG. 12 (12B) is an embodiment different from FIG. 11 (11B) and FIG. 12 (12A). In FIG. 12 (12B), the areas of the adhesive portions E (E1, E2) are all the same, but there is one row in region B4 and two rows in region B3. In this way, by providing more adhesive portions E in region B3 and fewer adhesive portions E in region B4, the area of adhesive portions E per unit area in region B3 where the curved elastic members 28, 26 are arranged may be made larger than the area of adhesive portions E per unit area in region B4 away from the curved elastic members 28, 26.

Figure 13 shows yet another embodiment. In Figure 13, the region B3 where the amount of adhesive applied is high is formed not only on the side seal portion 21 but also on the widthwise inner side of the side seal portion 21. Specifically, the region B3 where the amount of adhesive applied is high is formed linearly along the width direction from one end of the diaper to the other end in the width direction.

Diapers with this configuration can be manufactured, for example, by continuously applying a large amount of adhesive to only a certain portion in the CD direction. This eliminates the need to intermittently change the amount of adhesive applied, making diapers easier to manufacture. Furthermore, in the case of applying adhesive intermittently, it is possible to prevent the occurrence of defective products in which the timing at which the amount of adhesive is increased is shifted and an area with a large amount of adhesive is not formed in the side seal portion 21. As shown in FIG. 13, the widthwise ends of area B3 where the amount of adhesive is increased overlap with the ends of the curved elastic members 28 and 26.

In the above explanation, a form in which a new adhesive different from the adhesive in Figures 7 and 8 is applied to form area B3 with a larger amount of adhesive applied has been shown, but the present invention is not limited to such a form. For example, as shown in Figure 8, area B3 with a larger amount of adhesive applied may be formed by applying a larger amount of adhesive to the portion corresponding to adjacent area N1 in the adhesive applied area B2 than to other portions.

The amount of adhesive applied to region B3, where a larger amount of adhesive is applied, is approximately 11 to 25 g/ ^m2 , and the amount of adhesive applied to region B4, where a smaller amount of adhesive is applied, is approximately 1 to 5 g/ ^m2 . The amount of adhesive applied to region B3, where a larger amount of adhesive is applied, is approximately 2 to 25 times the amount of adhesive applied to region B4, where a smaller amount of adhesive is applied.

In addition, in FIG. 9, the area B3 with a large amount of adhesive is provided on both the ventral curved elastic member 28 of the front body F and the dorsal curved elastic member 26 of the back body B, but it may be provided on only one of them.

In addition, in the embodiment shown in Figures 10 to 12, the ends of the three ventral curved elastic members 28 are arranged substantially parallel to each other and spaced apart at a predetermined distance in the vertical direction, but they may not be arranged substantially parallel to each other.

In addition, when forming the portion B3 with a large amount of adhesive, if a reinforcing adhesive (a reinforcing adhesive for preventing the ends of the curved elastic members 26, 28 from being pulled in) other than the solid adhesive shown in FIG. 8 is applied, the reinforcing adhesive may be applied to the sheet (e.g., upper nonwoven fabric 20A) opposite the sheet (e.g., lower nonwoven fabric 20B) to which the solid adhesive is applied. The solid adhesive is the basic adhesive for bonding the upper nonwoven fabric 20A and the lower nonwoven fabric 20B and for bonding the curved elastic members 26, 28 arranged therebetween, and the reinforcing adhesive is an adhesive for preventing the ends of the curved elastic members 26, 28 from being pulled out. The solid adhesive and the reinforcing adhesive may be different types, or may be the same type. The solid adhesive and the reinforcing adhesive are not particularly limited, but may be, for example, a hot melt adhesive. In addition, the hot melt adhesive is not particularly limited, but can be of the following types: EVA-based, adhesive rubber-based (elastomer-based), olefin-based, polyester/polyamide-based, etc.

(Example of interior structure)
As shown in Figures 4 to 6, the inner body 10 has a structure in which an absorbent 13 is interposed between a liquid-permeable top sheet 11 made of nonwoven fabric or the like and a liquid-impermeable back sheet 12 made of polyethylene or the like, and absorbs and retains excretory liquid that has permeated the top sheet 11.

As the liquid-permeable top sheet 11 covering the front side (skin contact side) of the absorbent 13, a nonwoven fabric with or without holes or a porous plastic sheet is preferably used. The material fibers constituting the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, polyamides, regenerated fibers such as rayon or cupra, and natural fibers such as cotton, and nonwoven fabrics obtained by appropriate processing methods such as spunlace, spunbond, thermal bond, meltblown, and needle punch can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of bulk and softness. When a large number of through holes are formed in the liquid-permeable top sheet 11, urine and the like are quickly absorbed, and the sheet has excellent dry touch properties. The liquid-permeable top sheet 11 wraps around the side edges of the absorbent 13 and extends to the back side of the absorbent 13.

The liquid-impermeable back sheet 12 that covers the back side (non-skin contact side) of the absorbent body 13 is made of a liquid-impermeable plastic sheet such as polyethylene or polypropylene, but in recent years, moisture-permeable sheets are preferably used to prevent stuffiness. This water-proof and moisture-permeable sheet is a microporous sheet obtained by melt-kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching it in a uniaxial or biaxial direction.

The absorbent 13 may be a known material, such as a pulp fiber stack, a filament aggregate such as cellulose acetate, or a nonwoven fabric, with a high absorbent polymer mixed or bonded as necessary. In the illustrated example, a roughly rectangular planar shape is used, and its width is set so that it does not give the wearer a stiff feeling when it hits the crotch area. This absorbent 13 may be wrapped in a wrapping sheet 14, such as crepe paper, that has liquid permeability and liquid retention, as necessary, to maintain the shape and polymer. The shape of the absorbent 13 may be rectangular as shown in the figure, or it may be an hourglass shape (constricted shape) with the crotch area narrower than the back and ventral sides.

The inner body 10 is preferably provided on both sides with three-dimensional gathers BS that fit around the legs. The three-dimensional gathers BS are formed by a gathered nonwoven fabric 15. As shown in Figs. 4 and 5, a nonwoven fabric that is folded over to form a double sheet is preferably used as the gathered nonwoven fabric. The side edge of the absorbent body 13 that is wrapped around the liquid-permeable top sheet 11 is further wrapped around from above and bonded to the back side of the absorbent body 13. More specifically, the gathered nonwoven fabric 15 is bonded with a hot melt adhesive or the like in the longitudinal middle part of the diaper 1 from the width middle part to the back side of the absorbent body 13, leaving the part where the three-dimensional gathers BS are formed, and in the longitudinal front and rear ends, the section from the width middle part to one side edge is bonded to the back side of the absorbent body 13, and the part that forms the three-dimensional gathers BS is bonded with a hot melt adhesive or the like while being folded over the top surface of the absorbent body 13.

Inside the gathered nonwoven fabric 15 formed from a double-sheet nonwoven fabric, multiple thread-like elastic stretch members 16 are arranged at the rising tip side portion. The thread-like elastic stretch members 16 are used to form three-dimensional gathers BS by raising the nonwoven fabric portion protruding from the absorbent side edge by elastic stretching force as shown by the two-dot chain line in Figure 4 in the product state.

The liquid-impermeable backside sheet 12 penetrates into the double-sheet-like gathered nonwoven fabric 15 and, as shown in FIG. 4, forms a leak-proof wall at the lower end of the three-dimensional gathers BS. It is preferable to use an opaque liquid-impermeable backside sheet 12 so that the brown color of feces and urine does not come out. For opacification, a film made by adding pigments and fillers such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc, and barium sulfate to plastic is preferably used.

The thread-like elastic stretch member 16 can be made of commonly used materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester. To make it difficult to see from the outside, it is recommended that the thickness be 925 dtex or less, the tension be 150-350%, and the spacing be 7.0 mm or less. Note that instead of the thread-like elastic stretch member, a tape-like elastic stretch member having a certain width may be used.

The material fibers constituting the gathered nonwoven fabric 15, like those of the liquid-permeable top sheet 11, can be synthetic fibers such as olefins, polyesters, and amides, such as polyethylene or polypropylene, regenerated fibers such as rayon or cupra, and natural fibers such as cotton. Nonwoven fabrics obtained by appropriate processing methods such as spunbonding, thermal bonding, meltblown, and needle punching can be used, but it is particularly preferable to use nonwoven fabrics with excellent breathability and reduced basis weight to prevent stuffiness. Furthermore, for the gathered nonwoven fabric 15, it is preferable to use water-repellent nonwoven fabrics coated with silicone, paraffin metal, or alkylchromic cloid water repellents to prevent urine and other substances from passing through, prevent rashes, and improve the feel (dryness) on the skin.

(Front and rear presser sheet)
As shown in Fig. 1 and Fig. 4, front and rear holding sheets 50, 60 are provided to cover the front and rear ends of the inner body 10 attached to the inner surface of the outer body 20 and to prevent leakage from the front and rear edges of the inner body 10. To explain the illustrated embodiment in more detail, the front holding sheet 50 extends over the entire width direction from the inner surface of the folded-back portion 20C at the waist end of the inner surface of the front body F to a position overlapping the front end of the inner body 10, and the rear holding sheet 60 extends over the entire width direction from the inner surface of the folded-back portion 20C at the waist end of the inner surface of the back body B to a position overlapping the rear end of the inner body 10. If some non-adhesive portions are provided over the entire width direction (or only in the center) at the crotch side edges of the front and rear holding sheets 50, 60, not only will the adhesive not protrude, but this portion can be slightly raised from the top sheet to function as a leak-proof wall.

As shown in the figure, attaching the front and rear presser sheets 50, 60 as separate bodies has the advantage of allowing greater freedom in material selection, but also has the disadvantage of increasing the number of materials and manufacturing steps. For this reason, the folded-back portion 20C formed by folding the outer body 20 back onto the inside of the diaper 1 can be extended to the portion that overlaps with the inner body 10 to form a portion equivalent to the presser sheets 50, 60 described above.

The present invention can be used in pants-type disposable diapers such as those in the above example.

B... rear body, F... front body, 1... pants-type disposable diaper, 10... inner body, 11... liquid-permeable top sheet, 12... liquid-impermeable back sheet, 13... absorbent, 14... wrapping sheet, 15... gathered nonwoven fabric, 16... thread-like elastic stretch member, 20... outer body, 20C... folded-back portion, 21... side seal portion, 24... waist elastic member, 25... waist elastic member, 26, 28... curved elastic member, 26... back curved elastic member, 28... ventral curved elastic member, 29... leg line, B3... area where curved elastic members (26, 28) are arranged, B4... area away from area (B3) where curved elastic members (26, 28) are arranged, E... adhesive portion

Claims (4)

An exterior body that forms a front body and a back body,
Both side portions of the exterior body in the front body and both side portions of the exterior body in the back body are joined to form side seal portions, thereby forming a waist opening and a pair of left and right leg openings,
A curved elastic member is bonded to at least one of the front body and the rear body of the exterior body by an adhesive, the curved elastic member extending from one side seal portion to the other side seal portion,
The side seal portion is a portion where the adhesive portions between the exterior body of the front body and the exterior body of the back body are intermittently provided along the vertical direction, and the portions other than the adhesive portions are non-adhesive portions,
The adhesive portion is formed by ultrasonically bonding or thermally welding the exterior body of the front body and the exterior body of the back body,
the side seal portion has a placement region having a lower end spaced 0.5 to 10 mm below the upper end portion of the curved elastic member located at the lowest position and an upper end spaced 0.5 to 10 mm above the upper end portion of the curved elastic member located at the closest position to the waist opening, and a separation region spaced 10 mm or more above the upper end of the placement region,
the amount of the adhesive applied to the placement region is greater than the amount of the adhesive applied to the separation region;
an area of the adhesive portion per unit area of the arrangement region is larger than an area of the adhesive portion per unit area of the separation region;
A pants-type disposable diaper characterized by: In the side seal portion,
The curved elastic members are arranged linearly along the width direction,
In the arrangement region, a region where the amount of adhesive applied is large is formed linearly along the width direction.
2. The pants-type disposable diaper according to claim 1. the amount of the adhesive applied to the placement area is 2 to 25 times the amount of the adhesive applied to the separation area;
the area of the adhesive portion per square having a length of 10 mm in the vertical direction and a length of 10 mm in the width direction of the arrangement region is 20 mm ² to 50 mm ² ;
The area of the adhesive portion per square having a longitudinal length of 10 mm and a width length of 10 mm in the spaced apart region is 10 mm ² to 17 mm ² .
3. The pants-type disposable diaper according to claim 2. The shape, area and number of rows of the adhesive portions located in the arrangement region are equal to the shape, area and number of rows of the adhesive portions located in the separation region, and the interval between adjacent adhesive portions in the vertical direction in the arrangement region is shorter than the interval between adjacent adhesive portions in the vertical direction in the separation region;
the shape, number of rows of the adhesive parts, and interval between adjacent adhesive parts in the vertical direction located in the arrangement region are equal to the shape, number of rows of the adhesive parts, and interval between adjacent adhesive parts in the vertical direction located in the separation region, respectively, and the area of the individual adhesive parts in the arrangement region is greater than the area of the individual adhesive parts in the separation region, or the shape, area, and interval between adjacent adhesive parts in the vertical direction located in the arrangement region are equal to the shape, area, and interval between adjacent adhesive parts in the vertical direction located in the separation region, respectively, and the number of rows of the adhesive parts in the arrangement region is greater than the number of rows of the adhesive parts in the separation region;
an area of the adhesive portion per unit area of the arrangement region is larger than an area of the adhesive portion per unit area of the separation region;
The pants-type disposable diaper according to any one of claims 1 to 3.

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