JP5953962B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper that is attached to a wearer's crotch and absorbs and holds a liquid such as urine. More specifically, the present invention relates to a disposable diaper of a type in which an absorbent main body is crosslinked between a front body exterior body and a back body exterior body.

  Conventionally, a disposable diaper including a top sheet, a back sheet, and an absorbent body interposed between these sheets is known. In a general disposable diaper, the absorber is covered with a top sheet made of a liquid permeable material from the surface side in contact with the wearer's skin, and formed from a liquid impermeable material from the opposite back side. It is covered with. For this reason, for example, body fluid excreted by the wearer passes through the top sheet and is absorbed by the absorbent body, and leakage to the outside is prevented by the back sheet.

  Further, as a disposable diaper having the above configuration, an absorbent main body, and a front body exterior body and a rear body exterior body for holding the absorbent body around the waist of the wearer are separately formed. There is known a disposable diaper (so-called cross-linked disposable diaper) (for example, Patent Document 1). In the cross-linked disposable diaper, one end side in the length direction of the absorbent main body is fixed to the front body exterior body, and the other end side in the length direction of the absorbent main body is fixed to the rear body exterior body. For this reason, an absorptive main body becomes a structure bridge | crosslinked between a front body exterior body and a back body exterior body. And a pants-type disposable diaper is formed by joining the front body exterior body and the back body exterior body in the side seal part provided in the both-sides edge part in the state in which the absorptive main body was bridge | crosslinked. The wearer can wear the disposable diaper formed in a pants shape by inserting both legs. In such a cross-linked disposable diaper, the opening around the leg is wide open, so that the wearer can move both legs relatively freely even when the disposable diaper is worn. There is an advantage.

JP 2010-233733 A JP 2011-0050484 A

  By the way, in the bridging type disposable diaper disclosed in Patent Document 1, the front body exterior body and the back body exterior body are provided with a main body portion having side seal portions in the width direction of the diaper, and from the main body portion to the crotch direction. There is an extended part extending toward the end. The main body portion of the front body exterior body and the main body portion of the rear body exterior body are joined at the side seal portion to form an annular shape, and are in close contact with the wearer's abdomen. However, since the extension part of the front body exterior body and the extension part of the rear body exterior body are not connected to other parts, there is a problem that they are difficult to adhere to the skin of the wearer and float. It was. If the extension part of the front body exterior body and the back body exterior body floats from the skin of the wearer, urine leaks from the floated part, the floated part is caught on clothes, etc., and the overall appearance of the diaper There was a problem of getting worse.

  Moreover, in order to eliminate the said problem, it is possible to arrange | position the several elastic elastic member in the expansion | extension state along the width direction of a diaper in the front body exterior body and the back body exterior body, for example. In particular, by providing a plurality of elastic elastic members on the front body exterior body and the extension part, the extension part can be brought into close contact with the wearer's skin. As described above, a technique for arranging a plurality of elastic elastic members around the stomach of the disposable diaper is well known in, for example, Patent Document 2. However, if multiple elastic expansion and contraction members are arranged at regular intervals on the main body part and the extension part of the front body exterior body and the back body exterior body, the adhesion in the main body part is enhanced, but the extension part is elastically stretchable. Wrinkles may occur due to the contraction force of the member. In this way, if wrinkles occur in the extended parts of the front and rear body exterior bodies, a gap is created between the diaper and the wearer's body, leading to urine leakage and poor diaper appearance. There is a problem of becoming.

  Therefore, at present, there is a demand for a technique that can appropriately fit the main body portion and the extended portion of the front body exterior body and the back body exterior body to the wearer's body in the cross-linked disposable diaper.

Therefore, the inventors of the present invention have intensively studied the means for solving the problems of the above-described conventional invention, and as a result, a plurality of pieces arranged along the width direction of the main body portion of the front body exterior body and the back body exterior body. The elastic elastic members are arranged in the main body portion and the extending portion by making the interval between the elastic elastic members narrower than the intervals between the plurality of elastic elastic members arranged in the width direction of the extending portion. It was found that the elastic stretchable member can be properly balanced to improve the fit of the wearer's body. Based on such knowledge, the inventors have conceived that the conventional problems can be solved, and the present invention has been completed.
More specifically, the present invention has the following configuration.

The present invention relates to a cross-linked disposable diaper.
In the cross-linked disposable diaper, the front body side of the absorbent main body 3 is fixed to the front body exterior body 1, the rear body side of the absorbent main body 3 is fixed to the rear body exterior body 2, and the front body side of the absorbent main body 3 The crotch region located between the back body sides is not fixed to either the front body exterior body 1 or the back body exterior body 2.
The front body exterior body 1 and the back body exterior body 2 are joined at opposite end portions in side seal portions 11 and 21 provided at both end portions in the width direction of the disposable diaper.
Here, the front body exterior body 1 has a front main body region 12 in which side seal portions 11 are formed at both ends in the width direction, and extends from the front main body region 12 toward the crotch region and has a width in the crotch direction. And a front extension region 13 having a shape that gradually narrows toward the region.
The rear body exterior body 2 has a rear main body region 22 in which side seal portions 21 are formed at both end portions in the width direction, and extends from the rear main body region 22 toward the crotch region and has a width in the width direction. And a rear extension region 23 having a shape that gradually narrows toward the crotch region.
In the front body region 12, a plurality of first front elastic members 14 provided along the width direction are provided at intervals P1 in the length direction.
In the front extension region 13, a plurality of second front elastic members 15 provided along the width direction are provided at intervals P <b> 2 in the length direction.
In the rear main body region 22, a plurality of first rear elastic members 24 provided along the width direction are provided at intervals P3 in the length direction.
In the rear side extension region 23, a plurality of second rear side elastic members 25 provided along the width direction are provided at intervals P4 in the length direction.
The interval P1 between the plurality of first front elastic members 14 is narrower than the interval P2 between the plurality of second front elastic members 15. For example, the interval P1 is preferably 25% to 90% with respect to the interval P2.
The interval P3 between the plurality of first rear elastic members 24 is narrower than the interval P4 between the plurality of second rear elastic members 25. The interval P3 is preferably 20% to 80% with respect to the interval P4.

  As in the above-described configuration, for example, in the front body exterior body 1, the intervals P <b> 1 between the plurality of first front elastic members 14 arranged in the front main body region 12 are the plurality of second front sides arranged in the front extension region 13. By being narrower than the space | interval P2 between the expansion-contraction members 15, the front side main body area | region 12 of the front body exterior body 1 can be closely stuck around a wearer's abdomen. On the other hand, for example, in the front body exterior body 1, the gap P2 between the second front side elastic members 15 is wider than the gap P1 between the first front side elastic members 14, thereby covering the groin of the wearer with an appropriate fit. be able to. That is, by setting it as the said structure, it prevents that the front side extension area | region 13 of the front body exterior body 1 floats from a wearer's skin, and prevents that an unnecessary wrinkle arises in the front side extension area | region 13. it can. The same applies to the rear body exterior body 2.

  In the disposable diaper of the present invention, the interval P2 between the plurality of second front elastic members 15 is preferably narrower than the interval P4 between the plurality of second rear elastic members 25.

  By making it the said structure, while making the front side extension area | region 13 of the front body exterior body 1 fit a wearer's groin part appropriately, and also the back side extension area | region 23 of the back body exterior body 2 is also a wearer's Fits properly in the buttocks. That is, usually, around the waist of the human body, the buttocks have a bulge rather than the buttocks (a triangular portion at the center of the lower abdomen near the base of the thigh). For this reason, in order to fit the front side extension region 13 of the front body exterior body 1 appropriately to the wearer's groin, the interval P2 between the second front side elastic members 15 is preferably relatively narrow. On the other hand, even if the interval P4 of the second rear elastic member 25 is relatively wide, the rear extension region 23 of the rear body exterior body 2 fits appropriately due to the swelling of the buttocks. In this way, in consideration of the characteristics of the human body, the interval P2 between the plurality of second front elastic members 15 is made smaller than the interval P4 between the plurality of second rear elastic members 25, so that the diaper can be worn. Can be improved.

  In the disposable diaper of the present invention, the rear extension region 23 preferably extends longer in the length direction than the front extension region 13. In this case, the number of second rear elastic members 25 arranged in the rear extension region 23 is preferably larger than the number of second front elastic members 15 arranged in the front extension region 13.

  As described above, the area of the rear extension region 23 is made larger than the area of the front extension region 13, and a relatively large number of second rear elastic members 25 are arranged in the rear extension region 23. ， Can cover the wearer's buttocks without any gaps. On the other hand, the area of the front extension region 13 is made relatively small, and a relatively small number of second front elastic members 15 are arranged in the front extension region 13 so that the wearer's groin can be fitted with an appropriate area. Can cover well.

  In the disposable diaper of the present invention, the absorbent main body 3 includes an absorbent body 31 having a length that overlaps the front body exterior body 1 and the back body exterior body 2, and a liquid permeable coating that covers the absorbent body 31 from the skin contact surface side. It is preferable to provide a conductive top sheet 32 and a liquid-impermeable back sheet 33 that covers the absorbent body 31 from the non-skin contact surface side. In this case, among the plurality of first front elastic members 14 and the plurality of second front elastic members 15, the one that overlaps with the absorber 31 has a non-stretchable region that does not exhibit elasticity in the overlapping region. Is preferred. Similarly, among the plurality of first rear elastic members 24 and the plurality of second rear elastic members 25, those that overlap with the absorber 31 are non-stretchable regions that do not exhibit elasticity in the overlapping regions. It is preferable to have.

  In the case where the absorbent main body 3 has the absorber 31 for absorbing and holding the liquid, if the elastic stretchable member is disposed in a region overlapping with the absorber 31, the absorber 31 may be bent due to the influence of the stretch force. is there. Therefore, by forming a non-stretchable region in each elastic stretchable member at the portion overlapping with the absorbent body 31, bending of the absorbent body 31 can be eliminated.

  In the present invention, the interval between a plurality of elastic elastic members disposed along the width direction of the main body portion of the front body exterior body and the back body exterior body is disposed along the width direction of the extension portion. Further, since the distance between the plurality of elastic elastic members is narrower, the main body portion fits appropriately around the wearer's abdomen. On the other hand, by making the interval between the plurality of elastic elastic members provided in the extending part of the front body exterior body and the back body exterior body wider than the interval between the plurality of elastic elastic members provided in the main body part, While preventing the extension part from floating from the wearer's skin, it is possible to prevent the wrinkles from being generated in the extension region.

FIG. 1 is a perspective view showing an example of a disposable diaper according to the present invention. FIG. 2 is a development view showing an example of a disposable diaper according to the present invention. 3 is a cross-sectional view taken along line XX in FIG. FIG. 4 is a plan view showing the front body exterior body and the back body exterior body extracted. 4A shows the front body exterior body, and FIG. 4B shows the rear body exterior body. FIG. 5 is a developed view showing an example of a disposable diaper according to the present invention, and the joining portion of the absorbent main body to the front body exterior body and the back body exterior body is shown by hatching. 6 is a cross-sectional view of the disposable diaper shown in FIG. 6A shows a cross-sectional shape taken along line X1-X1 in FIG. 5, FIG. 6B shows a cross-sectional shape taken along line X2-X2 in FIG. 5, and FIG. The cross-sectional shape in the X3-X3 line is shown.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, but includes those appropriately modified by those skilled in the art from the following embodiments.
Here, in the present specification, “A to B” means “A or more and B or less”.
In the present specification, the “length direction” of a disposable diaper or an absorbent main body basically means the direction connecting the front body side and the back body side (vertical direction in FIG. 2), and “width” The term “direction” basically means a direction (left-right direction in FIG. 2) orthogonal to the length direction.

(1. Overall configuration of disposable diapers)
FIG. 1 is a schematic view showing an example of a disposable diaper 100, and shows a state where the disposable diaper 100 is viewed from the front body exterior body 1 side. FIG. 2 is a development view of the disposable diaper 100 shown in FIG. 1 and shows the disposable diaper 100 as viewed from the top sheet 32 side of the absorbent main body 3. In FIG. 2, various sheet materials constituting the disposable diaper are transparently drawn in order to show the positional relationship of the elastic stretchable members arranged in various places. Moreover, FIG. 3 has shown sectional drawing of the disposable diaper 100 in the XX line shown by FIG.

  As shown in FIGS. 1 and 2, the disposable diaper 100 includes a front body exterior body 1, a rear body exterior body 2, and an absorbent main body 3. The front body exterior body 1 contacts the abdomen of the wearer when worn, and the rear body exterior body 2 contacts the back of the wearer when worn. The front body exterior body 1 and the back body exterior body 2 are separated from each other. The front body exterior body 1 and the back body exterior body 2 may be individually formed, or may be integrally formed and separated later. The absorbent main body 3 has one end side in the length direction fixed to the front body exterior body 1 and the other end side fixed to the rear body exterior body 2. For this reason, in this invention, the absorptive main body 3 is in the state bridge | crosslinked between the front body exterior body 1 and the back body exterior body 2. FIG. As a means for fixing the absorbent main body 3 to the front body exterior body 1 and the back body exterior body 2, a known method can be used, for example, fixing using a hot melt adhesive or other fluid adhesive. It may be fixed to the method, or may be fixed by heat welding such as heat sealing or ultrasonic welding.

  Further, as shown in FIG. 1, the front body exterior body 1 and the rear body exterior body 2 are joined to each other at side seal portions 11 and 21 located on both side edges in the width direction, so that the front body exterior body 1 and The back body exterior body 2 is connected in an annular shape. For this reason, as shown in FIG. 1, a waist circumference opening 5 located around the wearer's waist when worn and a leg circumference opening 6 located around the wearer's leg when worn. In this way, a crosslinked disposable diaper 100 is formed. The wearer puts both legs into the waist opening 5 so that the abdomen is in contact with the front body exterior body 1 and the back is in contact with the back body exterior body 2, and the respective legs are placed around the legs. By taking out from the opening part 6, the bridge | crosslinking type disposable diaper 100 can be mounted | worn.

(2. Components of disposable diapers)
Hereinafter, the structure of the specific each part of the disposable diaper 100 of this invention is demonstrated concretely.

(2-1. Front body exterior body and back body exterior body)
The front body exterior body 1 and the back body exterior body 2 are in contact with the wearer's abdomen and back, and absorbable between the front body exterior body 1 and the back body exterior body 2 when the disposable diaper 100 is worn. It is a member for suspending the main body 3.

  The front body exterior body 1 and the back body exterior body 2 have a pair of side seal parts 11 and 21 at the left and right side edges in the width direction of the diaper. The front body exterior body 1 and the back body exterior body 2 are joined at a pair of side seal portions 11 and 21 with the right and left side edges in the width direction of the diaper being overlapped with each other. The pair of side seal portions 11 and 21 extend in the length direction of the diaper and are linearly formed. In the side seal portions 11, 21, the front body exterior body 1 and the back body exterior body 2 are joined by a known joining means such as hot emboss welding or ultrasonic emboss welding.

In the front body exterior body 1, a region extending from the location where the pair of left and right side seal portions 11 exists to the diaper width direction is a front main body region 12. In other words, the front-side main body region 12 is a rectangular region having side seal portions 11 at both left and right end portions in the diaper width direction and having the same length in the length direction as the side seal portions 11. In the front body exterior body 1, a region extending from the front main body region 12 toward the crotch region 3 a is a front extension region 13. The front extension region 13 is narrower in the diaper width direction than the front main body region 12, and the width of the front extension region 13 is gradually narrowed toward the crotch region 3a.
Similarly, in the back body exterior body 2, a region extending from the location where the pair of left and right side seal portions 21 exists to the diaper width direction is a rear main body region 22. That is, the rear main body region 22 is a rectangular region having side seal portions 21 at both left and right end portions in the diaper width direction and having the same length in the length direction as the side seal portions 21. In the rear body exterior body 2, a region extending from the rear main body region 22 toward the crotch region 3 a is a rear extension region 23. The rear extension region 23 is narrower in the diaper width direction than the rear main body region 22, and the width of the rear extension region 23 is gradually narrower toward the crotch region 3 a.

More specifically, as shown in the developed view of FIG. 2, the front body exterior body 1 is composed of a pair of both sides on which a long side 1a that is a side that becomes a waist circumference end and a pair of side seal portions 11 are formed. The shape includes a side 1b, a short side 1c that is formed substantially parallel to the long side 1a and to which the absorbent main body 3 is fixed, and a pair of oblique sides 1d that connect the pair of both sides 1b and the short side 1c. Yes. In this case, when one end of the pair of both sides 1b is connected by the long side 1a and the other end of the pair of both sides 1b is connected by an imaginary line, a substantially rectangular region defined is a front body. It becomes the front main body region 12 of the exterior body 1. On the other hand, when one end of the pair of hypotenuses 1d is connected by the short side 1c and the other end of the pair of hypotenuses 1d is connected by an imaginary line, the substantially trapezoidal region defined is the front body exterior body 1 It becomes the front extension region 13.
Similarly, the back body exterior body 2 is formed substantially in parallel with the long side 2a that is the side that becomes the waist end, the pair of both sides 2b on which the pair of side seal portions 21 are formed, and the long side 2a. It has a shape having a short side 2c that is a side to which the absorbent main body 3 is fixed, and a pair of oblique sides 2d that connect the pair of both sides 2b and the short side 2c. In this case, when one end of the pair of both sides 2b is connected by the long side 2a and the other end of the pair of both sides 2b is connected by an imaginary line, the substantially rectangular region defined is the rear body It becomes the rear main body region 22 of the exterior body 2. On the other hand, when one end of the pair of hypotenuses 2d is connected by the short side 2c and the other end of the pair of hypotenuses 2d is connected by an imaginary line, the substantially trapezoidal region defined is the rear body exterior body 2 It becomes the rear extension region 23.

  Further, as shown in FIG. 2, the rear extension region 23 of the rear body exterior body 2 extends longer in the direction of the crotch region 3 a than the front extension region 13 of the front body exterior body 1. For example, the length in the length direction of the rear extension region 23 is preferably 120% to 250%, or 150% to 200%, where the length of the front extension region 13 is 100%. . For this reason, the area of the rear extension region 23 of the back body exterior body 2 is larger than the area of the front extension region 13 of the front body exterior body 1. By setting it as such a shape, the wearer's buttocks can be appropriately covered by the rear side extension region 23 of the back body exterior body 2. On the other hand, with respect to the front body exterior body 1, the inclination of the pair of hypotenuses 1d is gentler than the inclination of the pair of hypotenuses 2d in the rear body exterior body 2, so the front body exterior body 1 and the rear body exterior body 2 are joined. Even if it is a case, the leg periphery opening part 6 will open the front body exterior body 1 side comparatively widely, and it will become easy for a wearer to move both leg parts.

  Moreover, it is preferable that the areas of the front main body region 12 and the rear main body region 22 are substantially equal (within ± 5%). Further, the area of the front extension region 13 is preferably 10% to 30% or 15% to 25% with respect to the area of the front main body region 12. The area of the rear extension region 23 is preferably 20% to 80% or 40% to 60% with respect to the area of the rear main body region 22. When the area of each part area | region of the front body exterior body 1 and the back body exterior body 2 satisfy | fills said relationship, a wearer's groin part and heel part are made into the front side extension area | region 13 and the back side extension area | region 23. Can be covered properly.

(2-1-1. Inner sheet and outer sheet)
The front body exterior body 1 and the back body exterior body 2 are configured by, for example, overlapping inner sheets 16 and 26 and outer sheets 17 and 27. The inner sheets 16 and 26 are disposed on the surface (skin contact surface) side that contacts the wearer's skin, and the outer sheets 17 and 27 are disposed on the surface (skin non-contact surface) side that does not contact the wearer's skin. Is done. The inner sheets 16 and 26 and the outer sheets 17 and 27 may be separately formed sheet materials. For example, one sheet material is folded at a position corresponding to the edge of the waist opening of the disposable diaper. May be formed integrally. Further, another sheet member may be interposed between the inner sheets 16 and 26 and the outer sheets 17 and 27. The inner sheets 16 and 26 and the outer sheets 17 and 27 are formed by, for example, a flexible fiber nonwoven fabric, a plastic sheet, or a laminate sheet thereof. The inner sheets 16 and 26 and the outer sheets 17 and 27 are bonded by, for example, a hot melt adhesive. Furthermore, between the inner sheets 16 and 26 and the outer sheets 17 and 27, a plurality of elastic elastic members arranged along the width direction of the disposable diaper are fixed in an extended state at intervals in the length direction. ing.

(2-1-2. Elastic elastic member)
The elastic elastic members disposed in the front body exterior body 1 and the back body exterior body 2 are members for forming a gather around the waist and the abdomen of the front body exterior body 1 and the back body exterior body 2. The gather is formed by causing wrinkles in the inner sheet and the outer sheet when a plurality of elastic elastic members sandwiched between the inner sheet and the outer sheet contract. By forming the gathers, the flexibility and adhesion of the front body exterior body 1 and the back body exterior body 2 can be increased.

FIG. 4 is a drawing obtained by extracting the front body exterior body 1 and the back body exterior body 2 from the configuration of the disposable diaper shown in the development view of FIG. 4A shows the front body exterior body 1, and FIG. 4B shows the rear body exterior body 2. FIG.
As shown in FIG. 4A, the front body region 12 of the front body exterior body 1 is provided with a plurality of first front elastic members 14. A plurality of second front elastic members 15 are provided in the front extension region 13 of the front body exterior body 1. Also, as shown in FIG. 4B, a plurality of first rear elastic members 24 are provided in the rear main body region 22 of the rear body exterior body 2. A plurality of second rear elastic members 25 are provided in the rear extension region 23 of the rear body exterior body 2. The first front side elastic member 14, the second front side elastic member 15, the first rear side elastic member 24, and the second rear side elastic member 25 extend over the entire width direction of the front body exterior body 1 and the rear body exterior body 2. It is arranged in an extended state and is provided at intervals in the length direction of the diaper. As shown in FIG. 4, it is preferable that the plurality of first front elastic members 14 and the second front elastic members 15 are arranged substantially in parallel, and the plurality of first rear elastic members. It is preferable that the member 24 and the second rear side elastic member 25 are also disposed substantially in parallel.

  First, in the front main body region 12 of the front body exterior body 1, a plurality of first front elastic members 14 are provided at intervals P1 in the length direction. When the intervals between the plurality of first front elastic members 14 provided in the front main body region 12 are not constant, the interval P1 means the narrowest interval among the intervals between the first front elastic members 14. It is preferable that the space | interval P1 of the 1st front side expansion-contraction member 14 is 1 mm-15 mm, or 3 mm-10 mm.

  Moreover, when the space | interval of several 1st front side expansion-contraction members 14 is not constant, it is preferable that the widest space | interval P1 'among the space | intervals of 1st front side expansion-contraction member 14 is 3 times or less of the narrowest space | interval P1. (P1 ′ ≦ 3P1). And it is preferable to arrange | position the 1st front side expansion-contraction member 14 in the front side main body area | region 12 of the front body exterior body 1 so that the clearance gap more than P1 'may not be formed in a length direction. By satisfying these conditions, as shown in FIG. 4A, the first front expansion / contraction member 14 is disposed over the entire front main body region 12. For example, it is preferable that the number of the 1st front side expansion-contraction members 14 arrange | positioned at the front side main body area | region 12 is 15-30 pieces, or 20-25 pieces.

  Further, one or a plurality of the first front side elastic members 14 may overlap with the absorbent body 31 of the absorbent main body 3, and a non-expandable region 14 a is formed at the center in the width direction overlapping the absorbent body 31. It may be. In the example shown in FIG. 4A, the first front expansion / contraction member 14 is intermittently cut in the non-expandable region 14a and is disposed only on the left and right sides in the width direction of the non-expandable region 14a. In addition, the 1st front side expansion-contraction member 14 may be made not to express a stretching property in the non-stretchable region 14a.

As shown in FIG. 4A, a plurality of second front elastic members 15 are provided in the lengthwise direction at intervals P <b> 2 in the front extension region 13 of the front body exterior body 1. When the intervals between the plurality of second front elastic members 15 provided in the front extension region 13 are not constant, the interval P2 means the narrowest interval among the intervals of the second front elastic members 15. However, it is preferable that the intervals between the plurality of second front elastic members 15 provided in the front extension region 13 are constant. By making the interval between the second front side elastic members 15 constant, the contractibility of the front extension region 13 becomes uniform, and it is possible to prevent unnecessary wrinkles and twists from occurring in the front extension region 13.
If the intervals between the plurality of second front elastic members 15 are not constant, the widest interval P2 ′ among the intervals between the second front elastic members 15 is preferably not more than three times the narrowest interval P2. (P2 ′ ≦ 3P2).

  As shown in FIG. 4A, the interval P2 between the second front elastic members 15 is secured wider than the interval P1 between the first front elastic members 14 (P2> P1). For example, the interval P2 is preferably 110% to 400%, 150% to 350%, or 200% to 300% with respect to the interval P1. In particular, when the intervals between the plurality of first front elastic members 14 are not constant, the interval P2 between the second front elastic members 15 is wider than the widest interval P1 ′ among the intervals between the first front elastic members 14. It is preferable that (P2> P1 ′). In other words, the interval P1 is narrower than the interval P2. For example, the interval P2 between the second front elastic members 15 is 2 mm to 80 mm, 10 mm to 60 mm, or 30 mm to 40 mm. Thus, the front extension region 13 is moderate with respect to the wearer's groin by ensuring the interval P2 between the second front elastic members 15 wider than the interval P1 between the first front elastic members 14. It comes in close contact with a fit.

  Moreover, it is preferable that the 2nd front side expansion-contraction member 15 is arrange | positioned so that the clearance beyond P2 (or P2 ') may not be formed in the front side extension area | region 13 of the front body exterior body 1 in a length direction. For example, the number of the second front elastic members 15 arranged in the front extension region 13 is 2 to 10 or 4 to 6.

  The second front side elastic member 15 may overlap the absorbent body 31 of the absorbent main body 3, or a non-expandable region 15 a may be formed at the center in the width direction overlapping the absorbent body 31. In the example shown in FIG. 4A, the second front elastic members 15 are intermittently cut in the non-expandable region 15a and are disposed only on the left and right sides in the width direction of the non-expandable region 15a.

Then, the elastic elastic member arrange | positioned at the back body exterior body 2 is demonstrated. As shown in FIG. 4 (b), the first rear elastic member 24 disposed in the rear body region 22 of the rear body exterior body 2 is
Basically, it is preferable that the conditions are the same as those of the first front elastic member 14 disposed in the front main body region 12 of the front body exterior body 1 described above. That is, in the rear main body region 22 of the back body exterior body 2, a plurality of first rear elastic members 24 are provided at intervals P3 in the length direction. When the intervals between the plurality of first rear elastic members 24 provided in the rear main body region 22 are not constant, the interval P3 is the narrowest interval among the intervals between the first rear elastic members 24. means. It is preferable that the space | interval P3 of the 1st back side expansion-contraction member 24 is 1 mm-15 mm, or 3 mm-10 mm, and it is preferable that it is especially equal to the space | interval P1 of the above-mentioned 1st front side expansion-contraction member 14. FIG.

  When the intervals between the plurality of first rear elastic members 24 are not constant, the widest interval P3 ′ among the intervals between the first rear elastic members 24 is not more than three times the narrowest interval P3. Is preferable (P3 ′ ≦ 3P3). And it is preferable to arrange | position the 1st back side expansion-contraction member 24 in the back side main body area | region 22 of the back body exterior body 2 so that the clearance gap more than P3 'may not be formed in the length direction. For example, the number of first rear elastic members 24 arranged in the rear main body region 22 is preferably 15 to 30, or 20 to 25, and particularly the first front elastic member 14 described above. The number is preferably equal to the number.

  One or a plurality of the first rear-side elastic members 24 may overlap with the absorbent body 31 of the absorbent main body 3, and a non-expandable area 24 a is formed at the center in the width direction overlapping the absorbent body 31. May be. In the example shown in FIG. 4B, the first rear elastic member 24 is intermittently cut in the non-expandable region 24a and is disposed only on the left and right sides in the width direction of the non-expandable region 24a.

As shown in FIG. 4B, a plurality of second rear elastic members 25 are provided in the rear extension region 23 of the rear body exterior body 2 at intervals P4 in the length direction. . In addition, when the space | interval of several 2nd rear side expansion-contraction members 25 provided in the rear side extension area | region 23 is not constant, the space | interval P4 is the narrowest space | interval among the space | intervals of the 2nd rear side expansion-contraction member 25. means. However, it is preferable that the intervals between the plurality of second rear elastic members 25 provided in the rear extension region 23 are constant. By making the interval between the second rear side elastic members 25 constant, the contraction property of the rear side extension region 23 becomes uniform, and unnecessary wrinkles and twists can be prevented from occurring in the rear side extension region 23. The fit to the wearer's buttocks is improved.
If the intervals between the plurality of second rear elastic members 25 are not constant, the widest interval P4 ′ among the intervals between the second rear elastic members 25 is not more than three times the narrowest interval P4. Is preferable (P4 ′ ≦ 3P4).

  As shown in FIG. 4B, the interval P4 between the second rear elastic members 25 is secured wider than the interval P3 between the first rear elastic members 24 (P4> P3). For example, the interval P4 is preferably 120% to 450%, 150% to 400%, or 250% to 350% with respect to the interval P3. In particular, when the intervals between the plurality of first rear elastic members 24 are not constant, the interval P4 between the second rear elastic members 25 is the widest interval P3 ′ among the intervals between the first rear elastic members 24. It is preferable that the width is wider (P4> P3 ′). In other words, the interval P3 is narrower than the interval P4. For example, the interval P4 between the second rear side elastic members 25 is 4 mm to 100 mm, 15 mm to 80 mm, or 40 mm to 60 mm. Thus, by ensuring the space | interval P4 of 2nd back side elastic members 25 between the space | interval P3 of the 1st back side elastic member 24, the back side extension area | region 23 is with respect to a wearer's buttocks. It comes in close contact with a moderate fit.

  Further, in the rear extension region 23 of the rear body exterior body 2, the second rear elastic member 25 may be arranged so that a gap of P4 (or P4 ′) or more is not formed in the length direction. preferable. For example, the number of the second rear side elastic members 25 arranged in the rear side extension region 23 is 3 to 15, or 5 to 10. The number of second rear side elastic members 25 provided on the rear body exterior body 2 is larger than the number of second front side elastic members 15 provided on the front body exterior body 1.

  The second rear side elastic member 25 may overlap the absorbent body 31 of the absorbent main body 3, or a non-expandable region 25 a may be formed at the center in the width direction overlapping the absorbent body 31. In the example shown in FIG. 4B, the second rear side elastic members 25 are intermittently cut in the non-expandable region 25a and are disposed only on the left and right sides in the width direction of the non-expandable region 25a.

  Furthermore, in the embodiment shown in FIGS. 4A and 4B, the interval P2 between the second front side elastic members 15 arranged in the front extension region 13 of the front body exterior body 1 and the back body When the distance P4 between the second rear side elastic members 25 arranged in the rear extension region 23 of the exterior body 2 is compared, the distance P2 is narrower than the distance P4 (P2 <P4). For example, the value of the interval P2 is preferably 30% to 80%, or 50% to 60% with respect to the value of the interval P4. That is, the front side extension region 13 of the front body exterior body 1 covers the wearer's groin, and the rear side extension region 23 of the back body exterior body 2 covers all or part of the wearer's buttock. However, usually around the waist of the human body, the buttocks have a larger bulge than the buttocks. For this reason, when the interval P2 between the second front side elastic members 15 and the interval P4 between the second rear side elastic members 25 are matched, for example, the front extension region 13 fits the wearer's groin appropriately. The rear extension region 23 unnecessarily tightens the wearer's buttocks, and conversely, the rear extension region 23 fits the wearer's buttocks appropriately, but the front extension region 13 is worn. The problem of floating from the person's groin part arises. Therefore, in the embodiment of the present invention, as shown in FIG. 4A and FIG. 4B, the interval P2 between the second front elastic members 15 is set to be greater than the interval P4 between the second rear elastic members 25. Is also narrow. In other words, since the distance P2 between the second front elastic members 15 is relatively narrow, the adhesiveness of the front extension region 13 is improved, and an appropriate fit is provided even for a groin portion having a small bulge. On the other hand, since the distance P4 between the second rear side elastic members 25 is relatively wide, the compression force of the rear side extension region 23 is reduced, and it fits without giving a feeling of pressure even to a heel portion having a large bulge. Thereby, the wearing feeling of the whole diaper is improved.

  A known elastic expansion / contraction member can be used for each expansion / contraction member 14, 15, 24, 25 described above. For example, it is preferable to apply a thread-like elastic rubber to each of the elastic members 14, 15, 24, 25. As such a rubber member, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, or polyester can be used. In addition, for each elastic member, a known member having elasticity such as a thermoplastic elastomer, a plastic sheet, or a rubber sheet can be used. Moreover, the elongation rate at the time of fixing each expansion-contraction member 14, 15, 24, 25 to the front body exterior body 1 and the back body exterior body 2 is, for example, 120% to 400%, 180% to 350%, or 240%. It may be ˜290%. In the present invention, the adhesion between the front body exterior body 1 and the back body exterior body 2 can be adjusted by the interval at which the elastic members 14, 15, 24, 25 are arranged. For this reason, for example, it is possible to make the expansion ratio and the thickness of each of the elastic members 14, 15, 24, and 25 uniform.

  A plurality of elastic elastic members arranged in the front body exterior body 1 and the back body exterior body 2 are conceptually arranged around the waist end of the diaper and do not overlap with the absorber 31; It can also be classified into Tammy stretchable members TE that are arranged around the belly of the diaper and provided at a position overlapping the absorber 31. Since the waist elastic member WE does not overlap with the absorber 31, no non-expandable region is formed as shown in FIG. On the other hand, since the tammy stretchable member TE overlaps with the absorbent body 31 in the diaper width direction, a non-stretchable region is formed in the overlapping portion. The plurality of waist elastic members WE and the plurality of tammy elastic members TE may have different thicknesses. For example, the waist elastic member WE can be formed of a thread-like elastic rubber that is thicker than the tammy elastic member TE. For example, the thickness of the waist elastic member WE may be 300 dtex to 1000 dtex, and the thickness of the tammy elastic member TE may be 150 dtex to 500 dtex.

(2-2. Absorbent body)
The absorbent main body 3 is held in a state of being bridged between the front body exterior body 1 and the back body exterior body 2, and is located in the crotch of the wearer when the disposable diaper 100 is worn, and the urine excreted by the wearer. It is a member for absorbing and holding the liquid. As shown in FIG. 2, the absorbent main body 3 has a pair of short sides at both ends joined to the front body exterior body 1 and the back body exterior body 2, and a side connecting both ends of the pair of short sides. It is formed in a substantially rectangular shape with a pair of long sides.
As shown in FIGS. 2 and 3, the absorbent main body 3 includes an absorbent body 31, a top sheet 32, a back sheet 33, a pair of three-dimensional gathers 34, a cover sheet 35, and a plurality of three-dimensional gather elastic members. 4 is the basic configuration. The three-dimensional gather elastic member 4 is divided into an outer gather elastic member 41 and an inner gather elastic member 42.

(2-2-1. Absorber)
The absorber 31 is a member for absorbing liquid such as urine and holding the absorbed liquid. The absorber 31 is disposed between a liquid-permeable top sheet 32 and a liquid-impermeable back sheet 33. The absorber 31 has a function of absorbing the liquid that has passed through the top sheet 32 and is made of an absorbent material. As the absorbent material constituting the absorber 31, a known material can be adopted. As an absorptive material, for example, one kind of fluff pulp, a superabsorbent polymer, or a hydrophilic sheet may be used alone, or two or more kinds may be used in combination. The absorbent material is usually formed and used in a single-layer or multi-layer mat shape. The absorber 31 is preferably enclosed in a region between the top sheet 32 and the back sheet 33. That is, as shown in FIG. 3, the top sheet 32 and the back sheet 33 are preferably joined together so as to surround the absorber 31.

  The shape of the absorber 31 can be appropriately designed according to the shape, size, and application of the disposable diaper. For example, the shape of the absorber 31 is preferably an hourglass shape as shown in FIG. The hourglass shape means that, on the front body exterior body 1 side and the rear body exterior body 2 side, both side edges of the absorbent body 31 have extended portions extending outward in the width direction. In the hourglass type, the extended portions are formed at the four corners of the absorber 31, so that a constricted portion that is curved or refracted toward the inside of the absorber 31 is formed at the center in the longitudinal direction of the absorber 31. . Moreover, the absorber 31 is good also as a rectangular shape, an ellipse shape, or a gourd shape currently used for the general disposable diaper.

(2-2-2. Top sheet)
The top sheet 32 is a member that is in direct contact with the skin of the wearer's crotch and allows liquid such as urine to pass through the absorber 31. For this reason, the top sheet 32 is made of a liquid-permeable material having high flexibility. Further, the top sheet 32 is disposed so as to cover the surface of the absorber 31. The example of the impermeable material which comprises the top sheet 32 is a woven fabric, a nonwoven fabric, or a porous film. Further, for example, a fiber made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon, which has been subjected to a hydrophilization treatment and further made into a nonwoven fabric may be used.

(2-2-3. Backsheet)
The back sheet 33 is a member for preventing the liquid that has passed through the top sheet 32 and absorbed by the absorber 31 from leaking. For this reason, the back sheet 33 is made of a liquid-impermeable material. The back sheet 33 is disposed so as to cover the bottom surface of the absorber 31 in order to prevent liquid leakage from the bottom surface of the absorber 31. An example of the impermeable material constituting the back sheet 33 is a liquid impermeable film made of polyethylene resin. In particular, it is preferable to use a microporous polyethylene film in which a plurality of fine pores of 0.1 to 4 μm are formed. As shown in FIG. 3, the absorber 31 is placed on the back sheet 33, the top surface of the placed absorber 31 is covered with the top sheet 32, and the top sheet 32 covering the absorber 31 is formed. , And bonded to the back sheet 33 along both side edges of the absorber 31. For example, the top sheet 32 and the back sheet 33 may be bonded by a bonding method using a hot melt adhesive or other fluid adhesive, or may be bonded by heat welding such as heat sealing or ultrasonic welding. It may be.

(2-2-4. Solid gather)
The pair of three-dimensional gathers 34 are members that stand along both side edges of the absorbent main body 3 and prevent side leakage of urine excreted by the wearer. A pair of three-dimensional gathers 34 may be formed along both side edges of the absorbent main body 3, or two or more pairs may be formed. The three-dimensional gather 34 forms a three-dimensional gather 34 that becomes a leakage barrier for urine in an upright state (a state in which the elastic elastic member is contracted), so that urine that has not permeated the top sheet 32 or the absorbent 31 It is possible to prevent urine that has not been absorbed from leaking from the opening around the leg of the disposable diaper.

  The three-dimensional gather 34 is formed by side sheets 34 a arranged along both side edges of the absorber 31. As shown in FIGS. 2 and 3, the side sheet 34 a is fixed on the top sheet 32 along the length direction of the disposable diaper. Further, the side sheet 34 a is fixed to the top surface of the top sheet 32 and the bottom surface of the back sheet 33 so as to sandwich both side edges of the top sheet 32 and the back sheet 33.

  In the three-dimensional gather 34, a plurality of three-dimensional gather expansion / contraction members 4 are disposed along the length direction of the disposable diaper, and stand up by utilizing the contraction force of the plurality of three-dimensional gather expansion / contraction members 4. That is, the three-dimensional gather elastic member 4 is fixed to the side seat 34a in an extended state. For this reason, when the three-dimensional gather expansion / contraction member 4 contracts, the side sheets 34a constituting the three-dimensional gather 34 also contract, and the three-dimensional gather 34 rises. The position where the three-dimensional gather expansion / contraction member 4 is arranged can be changed as appropriate according to the shape of the three-dimensional gather and the shape and size of the disposable diaper.

  In addition, as shown in FIG. 2, the plurality of three-dimensional gather expansion / contraction members 4 are not disposed over the entire length direction of the absorbent main body 3, but are in the crotch region in the length direction of the absorbent main body 3. It is arrange | positioned centering on 3a. That is, the side sheet 34 a has a region where the three-dimensional gather expansion / contraction member 4 is not disposed in the region at both ends in the length direction of the absorbent main body 3. The crotch region 3 a of the absorbent main body 3 means a region where the absorbent main body 3 is not fixed to either the front body exterior body 1 or the rear body exterior body 2. However, at least the plurality of three-dimensional gather elastic members 4 are formed to have a length that overlaps the front body exterior body 1 and the back body exterior body 2 with the crotch region 3a of the absorbent main body 3 as the center. That is, in the length direction of the absorbent main body 3, the length in which the plurality of three-dimensional gather elastic members 4 are arranged is longer than the length of the crotch region 3 a of the absorbent main body 3. For example, the length of the plurality of three-dimensional gather elastic members 4 is 110% to 200%, 120% to 180%, or 130% to 170% with respect to the length of the crotch region 3a of the absorbent main body 3. The

Further, as shown in FIG. 3, each of the three-dimensional gathers 34 is preferably formed by two pairs of gather parts, an outer gather part 341 and an inner gather part 342. Moreover, the outer gathering part 341 and the inner gathering part 342 may be composed of a single sheet material (side seat 34a). That is, as shown in FIG. 3, the side sheet 34 a partially fixed to the back surface (skin non-contact surface) of the back sheet 33 along the length direction of the absorber 31 is replaced with the top sheet 32 and the back sheet. The outer folded portion 341a is formed by folding back toward the inner side of the absorbent main body 3 on the outer side in the width direction from the joining position of 33. And the some outside gather expansion-contraction member 41 is arrange | positioned along the length direction of a disposable diaper in the outer side folding | returning part 341a of the side seat | sheet 34a. As a result, the side seat 34a rises at the outer folded portion 341a using the contraction force of the outer gather expansion / contraction member 41 to form the outer gather portion 341.
In addition, a part of the side sheet 34a folded at the outer folded part 341a is fixed on the surface (skin contact surface) of the top sheet 32 so as to sandwich the top sheet 32 and the back sheet 33. Further, the side sheet 34 a extends inward in the width direction from the fixed line with the top sheet 32, and the extending part faces inward in the width direction or outward in the width direction of the absorber 31. Are folded back to form an inner folded portion 342a. A plurality of inner gather expansion / contraction members 42 are arranged along the length direction of the disposable diaper on the inner folded portion 342a of the side seat 34a.
Thereby, the outer gather part 341 and the inner gather part 342 are formed in the three-dimensional gather 34.

  As the side sheet 34a constituting the three-dimensional gather 34, it is preferable to use a material having water repellency. As an example of the water-repellent material, it is preferable to use a nonwoven fabric such as spunbond or card emboss from the viewpoint of high water repellency and good air permeability. In particular, it is preferable to use a clogged nonwoven fabric such as SMS (spunbond / meltblown / spunbond) or SMMS (spunbond / meltblown / meltblown / spunbond) because of its high water pressure resistance.

(2-2-5. Cover sheet)
The cover sheet 35 is a member for reinforcing the back sheet 33 and improving its feel. As shown in FIG. 3, the cover sheet 35 is bonded to the side of the back sheet 33 that faces the clothing. The cover sheet 35 may be superposed and bonded to a part of the side sheet 34a. As the material constituting the cover sheet 35, a woven fabric or a non-woven fabric is used. In particular, it is preferable to use a nonwoven fabric or a wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene, or polyester as a material constituting the cover sheet 35.

(3. About the joining aspect of the absorptive main body with respect to a front body exterior body and a back body exterior body)
Then, with reference to FIG.5 and FIG.6, the joining aspect of the absorptive main body 3 with respect to the front body exterior body 1 and the back body exterior body 2 is demonstrated.
FIG. 5 is basically the same as the plan view shown in FIG. 2 except that the part where the absorbent main body 3 is joined to the front body exterior body 1 and the back body exterior body 2 is indicated by hatching. Yes.
Moreover, FIG. 6 has shown sectional drawing of the disposable diaper shown in FIG. 6A is a cross-sectional view taken along line X1-X1 shown in FIG. 5, FIG. 6B is a cross-sectional view taken along line X2-X2, and FIG. 6C is a cross-sectional view taken along line X3-X3. It is sectional drawing in a line. FIG. 6 basically shows a cross-sectional view of the joint portion between the absorbent main body 3 and the front body exterior body 1, but these cross-sectional views show the corresponding absorbent body 3 and rear body exterior body 2. This is the same as the cross-sectional view of the joint portion. For this reason, sectional drawing of the junction part of the absorptive main body 3 and the back body exterior body 2 is abbreviate | omitted.

  In the embodiment shown in FIG. 5, the region in which the absorbent main body 3 overlaps the front body exterior body 1 and the back body exterior body 2 has both end regions 51, stretchable regions 52, and the length direction of the absorbent body 3. , And are divided into intermediate areas 53.

(3-1. Both end regions)
Both end regions 51 are regions formed at both end portions in the length direction of the absorbent main body 3. That is, the both end regions 51 are formed at the end of the region where the absorbent main body 3 and the front body exterior body 1 are joined, and at the end of the region where the absorbent main body 3 and the rear body exterior body 2 are joined. The both end regions 51 are formed to extend from the edge in the length direction of the absorbent main body 3 to a predetermined length in a direction in which the crotch region 3a of the absorbent main body 3 exists. For example, the both end regions 51 are formed toward the crotch region 3a of the absorbent main body 3 in the range of about 5 mm to 50 mm, 10 mm to 45 mm, or 15 mm to 40 mm from the edge in the length direction of the absorbent main body 3. It is preferable. Further, for example, both end regions 51 are 5% to 30% in each of a region where the absorbent main body 3 is joined to the front body exterior body 1 and a region where the absorbent main body 3 is joined to the rear body exterior body 2. Or 10% to 20% of the area.

  As FIG. 5 shows, the absorptive main body 3 has the some solid gather expansion-contraction member 4 in the right-and-left both sides of the width direction. The plurality of three-dimensional gather elastic members 4 are arranged around the crotch region 3 a of the absorbent main body 3 and have a length that does not reach both end regions 51 of the absorbent main body 3. For this reason, the three-dimensional gather expansion / contraction member 4 does not intervene in the both-ends area | region 51 of an absorptive main body.

  And as FIG. 5 shows, the absorptive main body 3 is joined to the front body exterior body 1 and the back body exterior body 2 over the whole width direction area of the diaper in the both end area | region 51. As shown in FIG. A specific joining state in the both end regions 51 is shown in FIG. FIG. 6A shows a cross-sectional view of both end regions 51 of the absorbent main body 3. As shown in FIG. 6 (a), the absorbent main body 3 has a first joint 61 formed over the entire region in the width direction, and the front body exterior body is formed in the first joint 61. 1 is joined. Thus, it is preferable that the absorptive main body 3 is joined to the front body exterior body 1 and the back body exterior body 2 in the both end regions 51 without any separation.

  Further, as shown in FIG. 5, it is particularly preferable that both end regions 51 are formed so as to overlap both end portions in the length direction of the absorbent body 31 of the absorbent main body 3. That is, the both end regions 51 are preferably formed to extend from the longitudinal edge of the absorbent main body 3 toward the crotch region of the absorbent main body 3 to a position where the end of the absorbent body 31 exists. . Thus, by positioning the absorbent body 31 of the absorbent main body 3 in the both end regions 51, for example, when the wearer wears a diaper, the absorbent body 31 of the absorbent main body 3 is displaced or twisted. Can be prevented.

(3-2. Stretching area)
Subsequently, a stretchable region 52 exists in a region where the absorbent main body 3 overlaps the front body exterior body 1 and the back body exterior body 2. The stretchable region 52 is formed in the width direction of the absorbent main body 3 from a location where a plurality of three-dimensional gather stretchable members 4 arranged on the left and right sides of the absorbent main body 3 overlap the front body exterior body 1 and the rear body exterior body 2. It is the area | region formed over. The stretchable region 52 is formed at a position closest to the crotch region 3 a among the regions formed in the absorbent main body 3. That is, the stretchable region 52 is a region where the absorbent main body 3 is joined to the end portions of the front body exterior body 1 and the back body exterior body 2 on the crotch region 3a side.

  For example, the stretchable region 52 is within the range of about 10 mm to 100 mm, 20 mm to 90 mm, or 30 mm to 80 mm from the edge on the crotch region 3 a side of the front body exterior body 1 and the back body exterior body 2. It is preferable to form in the length direction. For example, the stretchable region 52 is 20% to 60% in each of a region where the absorbent main body 3 is joined to the front body exterior body 1 and a region where the absorbent main body 3 is joined to the rear body exterior body 2. Or an area of 30% to 50%. In particular, the stretchable region 52 is preferably located in a region including the front extension region 13 of the front body exterior body 1 and the rear extension region 23 of the rear body exterior body 2. The stretchable region 52 has different occupation area ratios in a region where the absorbent main body 3 is joined to the front body exterior body 1 and a region where the absorbent main body 3 is joined to the front body exterior body 1. May be.

  The stretchable region 52 is further divided into an outer region 52a positioned on the left and right outer sides in the width direction of the absorbent main body 3, and an inner region 52b positioned on the inner side of the outer region 52a. The pair of left and right outer regions 52a are at least outer elastic elastic members 4a positioned at the outermost side in the width direction of the absorbent main body 3 among the plurality of three-dimensional gather elastic members 4 arranged on the left and right sides of the absorbent main body 3. Is an area where However, one or a plurality of three-dimensional gather elastic members 4 may be arranged in the outer region 52a in addition to the outer elastic elastic members 4a. For example, in the example shown in FIG. 4, in addition to the outer elastic elastic member 4a, one solid gather elastic member 4 is arranged in the outer region 52a.

  Further, an inner region 52b is formed in a region between the pair of left and right outer regions 52a in the stretchable region 52. In the stretchable region 52, the proportion of the area occupied by the inner region 52b is preferably larger than the proportion of the area occupied by the pair of outer regions 52a. For example, the ratio of the area occupied by the inner region 52b is preferably 70 to 95%, 85% to 90%, or 80% to 85%.

  And as FIG. 5 shows, the absorptive main body 3 is spaced apart in the left-right paired outer area | region 52a with respect to the front body exterior body 1 and the back body exterior body 2 in the expansion-contraction area | region 52, and the inner area | region 52b between them. Then, it is fully bonded. A specific joining state in the stretchable region 52 is shown in FIG. FIG. 6B shows a cross-sectional view of the stretchable region 52 of the absorbent main body 3. As shown in FIG. 6 (b), the absorbent main body 3 has a second joint 62 formed over the entire inner region 52b. It is joined to the body 1. On the other hand, the absorptive main body 3 does not have a joining part in a pair of outer side area | region 52a located in the width direction outer side of the inner side area | region 52b, and is spaced apart from the front body exterior body 1. FIG. That is, the pair of outer regions 52 a includes at least the outer elastic member 4 a positioned at the outermost side in the width direction of the absorbent main body 3, and the outer elastic member 4 a is fixed to the front body exterior body 1. Not to be. As described above, the absorbent main body 3 is separated from the front body exterior body 1 and the back body exterior body 2 in the stretchable region 52 by the pair of outer regions 52a and joined by the inner region 52b positioned therebetween. Preferably it is.

  Further, as shown in FIG. 5, the width of the inner region 52 b in the stretchable region 52 is preferably larger than the width of the absorbent body 31 of the absorbent main body 3. That is, the inner region 52 b in the stretchable region 52 is preferably formed so as to spread outward in the width direction from the absorbent body 31 of the absorbent main body 3. Thus, by forming the inner region 52b in the stretchable region 52 wider than the absorbent body 31 of the absorbent main body 3, for example, when the wearer wears a diaper, the absorbent main body 3 absorbs It is possible to prevent the positional shift or twist in the body 31.

  Further, as shown in FIG. 6B, in the form in which the outer gathering portion 341 and the inner gathering portion 342 are formed on the absorbent main body 3, the inner gathering region 52b in the stretchable region 52 has at least the outer gathering portion. It is preferable that one or more of the plurality of outer gather elastic members 41 that form 341 are positioned. That is, among the plurality of outer gather elastic members 41, the outer gather elastic member 41 (outer elastic elastic member 4a) located on the outermost side in the width direction of the absorbent main body 3 is located in the outer region 52a of the elastic region 52, On the other hand, the outer gather elastic member 41 located on the innermost side is preferably located in the inner region 52 b of the elastic region 52. Thereby, the outer gather elastic member 41 (outer elastic elastic member 4a) located on the outermost side is not joined to the front body exterior body 1 and the back body exterior body 2, but is separated. On the other hand, the outer gather elastic member 41 located on the innermost side is joined to the front body exterior body 1 and the rear body exterior body 2. As described above, the plurality of outer gather expansion / contraction members 41 are separated from the front body exterior body 1 and the back body exterior body 2 and are joined to the front body exterior body 1 and the back body exterior body 2. The absorptive main body 3 can be stably joined to the front body exterior body 1 and the back body exterior body 2 without impairing the function of the outer gather expansion / contraction member 41.

(3-3. Intermediate region)
Furthermore, it is preferable that an intermediate region 53 exists in a region where the absorbent main body 3 overlaps the front body exterior body 1 and the back body exterior body 2. The intermediate region 53 is a region located between the both end regions 51 and the stretchable region 52 in the length direction of the absorbent main body 3. In the middle region 53, like the both end regions 51, a plurality of three-dimensional gather expansion / contraction members 4 arranged on both sides of the absorbent main body 3 may not be located, or the three-dimensional gathers positioned in the expansion / contraction region 52 may be provided. A part of the elastic member 4 may extend. The intermediate region 53 connects the both end regions 51 and the expansion / contraction region 52 and is not an essential element.

  For example, the intermediate region 53 is 10% to 75% in each of the region where the absorbent main body 3 is joined to the front body exterior body 1 and the region where the absorbent main body 3 is joined to the rear body exterior body 2, or It is preferable to occupy an area of 30% to 60%. The area ratio of the intermediate region 53 can be appropriately changed according to the area ratios of the both end regions 51 and the stretchable region 52. Further, even if the intermediate area 53 has different occupation area ratios in the area where the absorbent main body 3 is joined to the front body exterior body 1 and the area where the absorbent main body 3 is joined to the rear body exterior body 2. Good.

  The intermediate region 53 is further divided into a joining region 53a located at the center in the width direction of the absorbent main body 3 and a non-joining region 53b located outside the joining region 53a in the width direction. In the width direction of the absorbent main body 3, the width of the joining region 53 a of the intermediate region 53 is narrower than the width of both end regions 51 and wider than the width of the inner region 52 b of the stretchable region 52. For example, the width of the joining region 53 a of the intermediate region 53 is preferably 70% to 95%, 75% to 90%, or 80% to 85% with respect to the width of the both end regions 51. Further, for example, the width of the joining region 53a of the intermediate region 53 is 105% to 150%, 110% to 130%, or 115% to 120% with respect to the width of the inner region 52b of the stretchable region 52. preferable. In the example shown in FIG. 4, the width of the junction region 53a of the intermediate region 53 is constant. However, the width of the joining region 53a of the intermediate region 53 may be gradually reduced from the both end regions 51 toward the stretchable region 52, or may be gradually reduced steplessly. .

  In the intermediate region 53, the proportion of the area occupied by the bonding region 53a is preferably larger than the proportion occupied by the pair of non-bonding regions 53b. For example, the proportion of the non-bonded region 53b is preferably 70 to 95%, 85% to 90%, or 80% to 85%. Note that the width of the non-bonded region 53b of the intermediate region 53 may be appropriately changed according to the width of the bonded region 53a.

  And as FIG. 5 shows, the absorptive main body 3 is joined to the front area | region exterior body 1 and the back body exterior body 2 in the intermediate | middle area | region 53 in the joining area | region 53a, and is located in the outside The non-bonding region 53b to be separated is separated. A specific joining state is shown in FIG. FIG. 6C shows a cross-sectional view of an intermediate region of the absorbent main body 3. As shown in FIG. 6 (c), the absorbent main body 3 has a third joint 63 formed over the entire joint region 53a. It is joined to the body 1. On the other hand, the absorptive main body 3 does not have a joining part in a pair of non-joining area | regions 53b located in the width direction outer side of the joining area | region 53a, and is spaced apart from the front body exterior body 1. FIG.

  As shown in FIG. 5, the width of the joining region 53 a in the intermediate region 53 is preferably larger than the width of the absorbent body 31 of the absorbent main body 3. That is, it is preferable that the joining region 53 a in the intermediate region 53 is formed so as to spread outward in the width direction from the absorbent body 31 of the absorbent main body 3. Thus, by forming the joining region 53a wider than the absorbent body 31 of the absorbent main body 3, for example, in a state where the wearer wears a diaper, the joint area 53a is positioned on the absorbent body 31 of the absorbent main body 3. It is possible to prevent misalignment and twisting.

In the present invention, a difference occurs between the joining width of the both end regions 51 and the joining width of the inner region 52b in the stretchable region 52. Therefore, if the difference in the joining width is large, for example, the wearer wears a diaper. When a load is applied to the absorbent main body 3 such as when it moves, the joining of the both end regions 51 of the absorbent main body 3 is easily peeled off. Therefore, by providing the intermediate region 53 between the both end regions 51 and the stretchable region 52 and reducing the difference in the joint width in each region, it becomes possible to improve the joint strength of the entire absorbent main body 3 and fix it. The state can be stabilized.
In addition, by providing an intermediate region 53 between the end region 51 and the stretchable region 52 to reduce the difference in the bonding width in each region, unnecessary wrinkles do not enter the exterior body, and the appearance and the feeling of touch are good. Become.

As in the above configuration, first, the absorbent main body 3 is joined to the front body exterior body 1 and the back body exterior body 2 entirely in both end regions 51 located at both ends in the length direction. Thus, the joining state of an absorptive main body can be stabilized by fixing the both ends of the absorptive main body 3 to the front body exterior body 1 and the back body exterior body 2 firmly. Therefore, for example, in a state where the wearer wears a diaper, it is possible to prevent positional deviation or twisting from occurring in the absorbent main body 3.
Furthermore, the absorbent main body 3 is separated from the front body exterior body 1 and the back body exterior body 2 in the outer regions 52a located at the left and right sides of the absorbent body 3 where at least the outer elastic elastic member 4a is disposed. For this reason, at least the outer elastic elastic member 4a contracts without being affected by the fixation of the absorbent main body 3 and the front body exterior body or the fixation of the absorbent main body 3 and the rear body exterior body 2. Therefore, the absorptive main body 3 can stand up in the direction where the outer elastic elastic member 4a is in contact with the wearer's skin by using the contraction force of the outer elastic elastic member 4a. Therefore, according to the said structure, the adhesiveness main body 3 and a wearer's skin adhesiveness can be improved, and effects, such as prevention of urine leakage and improvement of a wear feeling, can be exhibited appropriately.
As described above, according to the present invention, the function of the elastic elastic member can be sufficiently exerted while preventing the displacement and twisting of the absorbent main body 3, so that the feeling of use and wearing of the entire disposable diaper is improved. improves.

Further, by providing the intermediate region 53 between the both end regions 51 and the stretchable region 52 as in the above configuration, the fixed state of the absorbent main body 3 with respect to the front body exterior body 1 and the back body exterior body 2 is further stabilized. be able to. That is, in the present invention, a difference occurs between the joining width of the both end regions 51 and the joining width of the inner region 52b in the stretchable region 52. However, when the difference in the joining width is large, for example, when the load is applied to the absorbent main body 3 such as when the wearer exercises while wearing a diaper, the joint of the both end regions 51 of the absorbent main body 3 is performed. Becomes easy to peel. In this respect, since the intermediate region 53 is provided between the both end regions 51 and the stretchable region 52 and the difference in the bonding width in each region is reduced, the bonding strength of the entire absorbent main body 3 can be improved. , Stabilization of the fixed state can be achieved.
Further, if the difference between the joining width of the both end regions 51 and the joining width of the inner region 52b in the stretchable region 52 is large, wrinkles are formed in the exterior body at the location where the difference occurs, and the appearance and the feeling of touch are deteriorated. In this regard, in the present invention, by providing an intermediate region 53 between the both end regions 51 and the stretchable region 52 to reduce the difference in bonding width in each region, the absorbent main body 3 becomes smooth and worn. An improvement in feeling can be achieved.

  As mentioned above, in this specification, in order to express the content of this invention, embodiment of invention was described, referring drawings. However, the present invention is not limited to the above-described embodiments, but includes modifications and improvements obvious to those skilled in the art based on the matters described in the present specification.

  The disposable diaper according to the present invention can be applied to diapers for infants and the elderly. Therefore, the present invention can be suitably used in industries related to childcare and nursing care.

DESCRIPTION OF SYMBOLS 1 Front body exterior body 2 Back body exterior body 3 Absorbent main body 3a Crotch region 4 Three-dimensional gather expansion-contraction member 4a Outer elastic expansion-contraction member 5 Abdominal circumference opening part 6 Leg circumference opening part 11 Side seal part (front body exterior body)
12 front side main body region 13 front side extended region 14 first front side elastic member 15 second front side elastic member 21 side seal part (rear body exterior body)
22 Rear side body region 23 Rear side extension region 24 First rear side elastic member 25 Second rear side elastic member 16, 26 Inner sheet 17, 27 Outer sheet 31 Absorber 32 Top sheet 33 Back sheet 34 Three-dimensional gather 34a Side sheet 341 Outside gathering part 341a Outside folding part 342 Inside gathering part 342a Inside folding part 35 Cover sheet 41 Outside gather expansion / contraction member 42 Inside gathering expansion / contraction member 51 Both ends area 52 Expansion / contraction area 52a Outer area 52b Inner area 53 Intermediate area 53a Joining area 53b Non-joining Region 61 First joint 62 Second joint 63 Third joint 100 Disposable diaper

Claims (5)

It has a front body exterior body (1), a rear body exterior body (2), and an absorbent main body (3).
The front body side of the absorbent main body (3) is fixed to the front body exterior body (1),
The back body side of the absorbent main body (3) is fixed to the back body exterior body (2),
In the length direction of the disposable diaper, the crotch region located between the front body side and the back body side of the absorbent main body (3) is the front body exterior body (1) and the back body exterior body (2 ) Disposable diapers that are not fixed to any of
The front body exterior body (1) and the back body exterior body (2) are joined at opposite end portions in side seal portions (11, 21) provided at both end portions in the width direction of the disposable diaper. ,
The front body exterior body (1)
A front body region (12) in which the side seal portion (11) is formed at both end portions in the width direction;
A front extension region (13) extending from the front main body region (12) toward the crotch region and having a shape in which the width in the width direction gradually narrows toward the crotch region. ,
The rear body exterior body (2)
A rear body region (22) in which the side seal portion (21) is formed at both end portions in the width direction;
A rear extension region (23) extending from the rear body region (22) in the direction of the crotch region, and having a shape in which the width in the width direction gradually decreases toward the crotch region, Have
In the front body region (12), a plurality of first front elastic members (14) provided along the width direction are provided at intervals (P1) in the length direction,
In the front extension region (13), a plurality of second front elastic members (15) provided along the width direction are provided at intervals (P2) in the length direction,
In the rear main body region (22), a plurality of first rear elastic members (24) provided along the width direction are provided at intervals (P3) in the length direction. ,
In the rear extension region (23), a plurality of second rear elastic members (25) provided along the width direction are provided at intervals (P4) in the length direction. And
The interval (P1) between the plurality of first front elastic members (14) is smaller than the interval (P2) between the plurality of second front elastic members (15),
An interval (P3) between the plurality of first rear elastic members (24) is narrower than an interval (P4) between the plurality of second rear elastic members (25).
The absorbent main body (3) has a plurality of outer gather expansion / contraction members (41) arranged on both left and right sides in the width direction,
The absorbent main body (3)
In a stretchable region (52) extending in the width direction from a place where the plurality of outer gather stretchable members (41) overlap the front body exterior body (1) and the back body exterior body (2),
Among the plurality of outer gather elastic members (41) , at least the outer region (52a) in which the outer elastic elastic member (4a) located at the outermost side in the width direction of the absorbent main body (3) is disposed The outer body (1) and the rear body outer body (2),
The inner region (52b) on the inner side in the width direction than the outer region (52a) is joined to the front body exterior body (1) and the rear body exterior body (2) ,
Of the plurality of outer gather elastic members (41), at least the outer gather elastic member (41) located at the innermost side in the width direction of the absorbent main body (3) is located in the inner region (52b). Disposable diapers. The plurality of outer gather expansion / contraction members (41) are at least at both end regions (51) located at both ends in the length direction of the absorbent main body (3) along the length direction of the absorbent main body (3). Is arranged in a length that does not reach,
The absorbent main body (3) is joined to the front body exterior body (1) and the rear body exterior body (2) across the entire width direction in both end regions (51) in the length direction. The disposable diaper according to claim 1. The interval (P2) between the plurality of second front elastic members (15) is narrower than the interval (P4) between the plurality of second rear elastic members (25). Disposable diapers. The rear extension region (23) extends longer in the length direction than the front extension region (13),
The number of the second rear elastic members (25) arranged in the rear extension region (23) is the number of the second front elastic members (15) arranged in the front extension region (13). The disposable diaper according to claim 3. The absorbent main body (3)
An absorbent body (31) having a length overlapping with the front body exterior body (1) and the back body exterior body (2);
A liquid-permeable top sheet (32) for covering the absorbent body (31) from the skin contact surface side;
A liquid-impermeable back sheet (33) for covering the absorbent body (31) from the skin non-contact surface side,
Of the plurality of first front elastic members (14) and the plurality of second front elastic members (15), those that overlap the absorber (31) do not exhibit elasticity in the overlapping region. Has a non-stretchable region,
Among the plurality of first rear elastic members (24) and the plurality of second rear elastic members (25), those that overlap with the absorber (31) have elasticity in the overlapping region. The disposable diaper according to any one of claims 1 to 4, further comprising a non-stretchable region that does not develop.

Images