JP4588471B2 - Pants-shaped diapers - Google Patents

Description

The present invention relates to a pants-type disposable diaper having elastically stretchable members to the body portion except for the waist edge.

  In recent years, paper diapers, especially pants-type diapers with a pair of leg openings and waist openings formed in advance, are elastically elastic, such as rubber thread, in place to improve their fit to the body. The member is fixed in the stretched state, and the contraction force is applied in advance to give stretchability.

  For example, the present applicant has proposed to provide elastic elastic members along the circumferential direction not only at the waist end but also at the lower body part in order to enhance the fit in the lower abdomen and the heel ( Patent Document 1). It has also been proposed to dispose elastic elastic members along the edges of the leg openings.

However, this conventional disposable diaper still has room for improvement in fit, and there is a problem that mounting displacement occurs or leakage occurs.
JP 2002-172139 A

  Therefore, the main problem of the present invention is to improve the fit around the abdomen, buttocks and legs, and prevent leakage and misalignment.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A pants-type disposable diaper in which the waist edge on the ventral side and both side edges of the lower waist and the side edges of the waist end and lower waist on the back side are joined to form a waist opening and a pair of left and right leg openings In
From the back side width direction one side edge portion of the waist end to the other side edge portion, both the waist resilient and elastic members are secured in a stretched state, dorsal waist bottom and one side in the width direction definitive the crotch of from the edge to the other side edge, the one or more dorsal resilient and elastic members each being secured in a stretched state,
From the ventral side of the waist edges widthwise one side edge portion of the to the other side edge, both from the side edges waist definitive in lower width direction of one of the ventral side waist resilient and elastic members are secured in a stretched state to the other side edge, one or more ventral resilient and elastic members are secured in a stretched state,
The back elastic elastic member having ends at both side edges of the lower waist extends linearly along the width direction,
The back-side resilient and elastic members having ends on both side edges of the crotch portion, so as to approach the longitudinal crotch side as facing the widthwise center in the width direction both side edge portions, and closer to the widthwise center, buttocks Has a diagonally arranged portion extending along the lower leg base portion ,
All the ventral elastic elastic members extend linearly along the width direction,
Pants-type paper diaper characterized by that.

(Function and effect)
The inventors of the present invention have been diligently researching the relationship between the arrangement of the elastic stretchable member and the fit property in the conventional product. In the first place, the cause of inadequate fit is not only due to the arrangement of elastic elastic members, and it seems that the conventional product seems to fit well at first glance. It was.

  However, as a result of detailed studies, the conventional one overlooks the difference in quality between the front shape and the rear shape of the diaper wearing part in the body. That is, in the front of the diaper wearing part in the body, there is a bulge of the lower abdomen at the upper part, there is a substantially flat part on the lower side, and the boundary between both extends along the substantially width direction, On the rear surface of the diaper-attached portion of the body, there is a substantially flat portion at the top, a bulge of the buttocks at the bottom, and a substantially 1/4 spherical curved surface from the top to the bottom of the bulge of the buttocks. Accordingly, if the elastic elastic members on the back side and the ventral side are in a substantially symmetric direction and arrangement as in the conventional product, the fit property on either the back side or the ventral side is insufficient. Therefore, the present inventors have studied various arrangements of the elastic elastic members in consideration of the body shape, but although it is easy to find an arrangement with a high static fit, the one with a high dynamic fit, In other words, it was not predictable from the arrangement that the fit does not deteriorate even with respect to the movement.

The present invention has been made as a result of such research. Characteristically, the ventral elastic elastic member is linearly extended along the width direction from both side edges in the width direction. Of the elastic elastic members on the back side, those having end portions on both side edges of the crotch portion have obliquely arranged portions extending so as to approach the crotch side in the longitudinal direction as approaching the center in the width direction. is there.

  As described above, since the undulation change from the waist to the crotch is substantially uniform in the width direction on the front surface of the diaper wearing portion in the body, the ventral elastic elastic member extends linearly along the width direction. And a high fit is shown in any of the swelling of a lower abdomen, the substantially flat part of the lower side, and the boundary of both. On the other hand, when the abdominal elastic elastic member has the same oblique portion as the back elastic elastic member, the diaper is worn and the subsequent movement is not bad even though the fit is not bad. Cannot be accommodated, resulting in misalignment and reduced fit. In particular, it is considered that the longitudinal component of the contraction force of the elastic elastic member promotes the slippage of the diaper.

On the other hand, on the rear surface of the diaper-attached portion of the body, the undulation change below the top of the buttocks is not considered to be substantially uniform in the width direction, but rather can be regarded as a substantially ¼ spherical surface. In this case, if the dorsal elastic elastic member having ends on both side edges of the crotch has an obliquely disposed portion, the contraction force in the oblique direction acts so as to wrap along the curved surface of the buttocks. Moreover, the leg periphery has an arc shape in the lower leg base portion of the buttock, and the contraction force in the oblique direction of the present invention acts along this leg periphery. Therefore, high fit is also exhibited on the back side. On the other hand, when the dorsal elastic elastic member having ends on both side edges of the crotch is along the width direction like the abdominal elastic elastic member, it fits in a straight state with a diaper worn. Although it is not bad, it cannot cope with the subsequent movement, and a slippage such as a buttock protrudes and the fit property is lowered. In particular, it is considered that the circumferential component of the contraction force of the elastic elastic member moves around the leg toward the center in the width direction, and the buttock protrudes.

  And it should be noted here that when considering dynamic fit, the contraction force of the abdominal elastic elastic member and the contraction force of the back elastic elastic member influence each other through the side edge of the diaper. That is, when one of the fitting properties is low, the other arrangement is broken and the fitting property as a whole is lowered. Now, for example, in the case where a back elastic elastic member having an oblique portion similar to that of the present invention is provided, the case where the fit of the ventral portion is low is considered. In this case, the part having the abdominal elastic elastic member floats from the skin and is easy to move, and as a result of the movement of the both side edges of the diaper, the inclination of the oblique part of the back elastic elastic member changes, and the back side In addition, the fit is reduced. On the other hand, in the present invention, as described above, both the ventral and dorsal side fitting properties are high, and thus the leakage preventing effect exceeding the level that can be predicted from the conventional product is exhibited.

<Invention of Claim 2>
With dorsal resilient and elastic members are provided vertically at an interval three or more having an end portion to the side edges of the crotch portion, the maximum longitudinal spacing of the back side elastic extensible members adjacent in the oblique placement portion The underpants type disposable diaper according to claim 1, which is wider as it is closer to the crotch side.

(Function and effect)
By setting it as such an arrangement | positioning form, the back | dorsal elastic elastic member which has an edge part in the both-sides edge part of a crotch part exhibits the contraction force along the curved surface of a hip part more, and higher fitting property is brought about.

<Invention of Claim 3>
In the diagonally arranged portion of the back elastic elastic member, the vertical distance between the position farthest from the crotch and the position closest to the crotch is 1/50 to 1/2 times the vertical length of the back side part. The underpants type paper diaper according to claim 1 which is made.

(Function and effect)
It is particularly preferable that the diagonally arranged portion of the back-side elastic stretchable member is provided over such a longitudinal range so as to exhibit the effects of the present invention.

<Invention of Claim 4>
The back side elastic stretchable member is
Whether it is provided in a pattern consisting of a part extending linearly from the side edge and an intermediate part in the width direction forming a circular arc shape that swells to the crotch side,
The whole is provided in an arc-curved pattern in which the inclination decreases as it approaches the center in the width direction, or extends along the width direction for a predetermined length from the side edge toward the center, and the width direction The underpants type disposable diaper according to any one of claims 1 to 3, wherein the middle part is provided in a pattern extending in a diagonally straight line so as to approach the longitudinal crotch side as it approaches the center in the width direction .

(Function and effect)
The diagonally arranged portion of the back elastic elastic member may be linear, but if it has a curved shape whose inclination decreases as it approaches the center in the width direction, it has a high fit to the curved surface of the buttocks. This is preferable because it is provided.

<Invention of Claim 5>
Absorber along the longitudinal direction with provided in the width direction intermediate portion, in a portion overlapping the absorber dorsal resilient and elastic members and the front resilient and elastic members are cut, and the back side elastic stretchable member and the front elastic The width of the cut portion of the expansion / contraction member is configured to be narrower as it approaches the longitudinal crotch side , or the back side elastic expansion / contraction member and the ventral side elastic expansion / contraction member are not provided, and the back side elastic expansion / contraction member and the ventral side The underpants type disposable diaper according to any one of claims 1 to 4, wherein a width of a portion where no elastic elastic member is provided is configured to become narrower as it approaches the longitudinal crotch side .

(Function and effect)
In this case, since the contraction force does not act on the portion overlapping with the absorber, the appearance is clear, and the absorption capability inhibition due to the contraction / deformation of the absorber can be prevented.
Further, on the crotch side, the absorber is sandwiched between both feet. For this reason, the absorbent body is contracted in the width direction toward the crotch side, and the absorption capacity is easily inhibited. Therefore, by configuring as described in this section, the elastic force is increased toward the crotch side, and the absorbent body can be pulled and expanded more widely, thereby preventing the absorption ability from being hindered on the crotch side.

<Invention of Claim 6>
Longitudinal length of the waist end portion is 15 to 40 mm, longitudinal length of the waist bottom is 65～120Mm, and the longitudinal length of said crotch section is 100 to 400 mm, according to claim 2 Pants-shaped paper diapers as described.

<Invention of Claim 7>
As the dorsal elastic elastic member and ventral elastic elastic member, 10 to 30 thread rubbers having a thickness of 100 to 1000 dtex are provided on the dorsal side and the ventral side with a space of 5.0 mm or less between each other . The underpants type paper diaper of any one of Claims 1-6.

(Function and effect)
It is particularly preferable that the diagonally arranged portion of the back-side elastic stretchable member is provided over such a longitudinal range so as to exhibit the effects of the present invention.

  As described above, according to the present invention, it is possible to improve the fit around the hips and the legs, and to provide advantages such as effectively preventing leakage and mounting displacement.

Hereinafter, the embodiment of the present invention will be described in detail with reference to an example of a pants-type disposable diaper.
(First embodiment)
The pants-type disposable diaper according to the first embodiment will be described with reference to FIG. 2 to FIG. 5 while explaining the terms relating to the site and direction of the present invention mainly with reference to FIG. 1 to 5, the pants-type disposable diaper according to the first embodiment is fixed to the outer sheet 1 forming the outer shape of the diaper and the inner surface of the outer sheet 1 and is longitudinally centered on the crotch 4 ( The main component is an absorption main body 10 extending in the front-rear direction.

  The outer shape sheet 1 is formed by laminating and fixing two or three or more breathable / water-repellent nonwoven fabrics. In the final stage of the manufacturing process after the outer shape sheet 1 and the absorbent main body 10 are superposed, 5) By joining F and dorsal side (rear body) B in the whole longitudinal direction of both sides of the waist part by means such as ultrasonic sealing or heat melting (this joining part is denoted by reference numeral 30), FIG. As shown, a waist opening WO is formed at the upper end, and a pair of leg openings LO are formed at the left and right lower portions.

Here, the “longitudinal direction” in the present invention means a direction connecting the ventral side and the dorsal side, “circumferential direction” means a direction orthogonal to the vertical direction, and the width direction means the left-right direction of the product. Means. “Waist end” W means the entire region of a predetermined longitudinal length range from the edge of the waist opening WO. The portion between the waist end W and the crotch side is a “main body portion” T, and this main body portion T is defined as the entire region in the length range from the lower edge of the waist end W to the upper end of the leg opening LO. and waist bottom "U, defined as the entire area of a length range which forms the leg openings LO" Ru him crotch portion "L and half. As can be seen from this point, both side edges in the width direction of the main body portion include edges of the leg openings LO. These longitudinal lengths may be appropriately determined depending on the size and type of the product, but the waist end W is 15 to 40 mm, the lower waist U is 65 to 120 mm, and the crotch L is 100 to 400 mm.

  As shown in FIG. 3, the absorbent main body 10 of the present embodiment mainly includes a rectangular liquid-permeable top sheet 11 that directly touches the wearer's skin and an absorbent core 13, and the entire upper and lower surfaces are creped as necessary. It has an absorber AB wrapped by paper 14 and a liquid-impermeable back sheet 12 reaching the vicinity of both side edges on the back surface of the absorber AB. The liquid-permeable top sheet 11 wraps around both side edges of the absorber AB and reaches the back surface, and is overlaid on the liquid-impermeable back sheet 12. These elements are bonded and integrated by a hot melt adhesive. Yes. In the figure, an asterisk indicates an adhesion part. For the purpose of absorption control such as improving the diffusivity of the body fluid in the planar direction, a second sheet 11S may be interposed between the liquid-permeable top sheet 11 and the crepe paper 14 as shown in the drawing as necessary. it can. The absorbent main body 10 can be integrated by adhering almost the entire back surface to the outer sheet 1 with a hot melt adhesive or the like.

  On both sides of the absorbent main body 10, leg-raising cuffs C, C projecting toward the use surface are formed. In the standing cuff C, a standing elastic sheet 40 that is substantially continuous in the width direction is stretched with one elastic elastic member, for example, one elastic elastic member 50, 50... It is fixed and is configured to stand by the contraction force of the elastic elastic member.

  More specifically, the standing cuff C is formed by doubling the standing sheet 40, and is formed by wrapping the elastic stretch members 50, 50... It is. The inner surfaces of the double upright sheets 40 go around the back surfaces of the absorber AB and the liquid-impermeable back sheet 12 and are fixed by a hot melt adhesive or the like. Therefore, the fixed start end of the double upright sheet 40 forms the upright end of the upright cuff C, and the front end side of the upright end forms a free portion that is not fixed to the product body. However, the front and rear end portions in the longitudinal direction of the free portion are fixed to the article in a folded state, specifically, to the outer surface of the liquid-permeable top sheet 11. This fixing can be performed by a hot melt adhesive or the like. Further, at least one of the elastic elastic members 50, 50... Is in the free part, but the elastic elastic member 50 is particularly preferably at the tip of the free part, and as shown in the figure. In addition, it is preferable to have elastic elastic members 50 on the root side, and it is more desirable to have a plurality of elastic members at the tip as shown. In the standing cuffs C, C thus configured, the contraction force of the elastic elastic members 50, 50... Acts, so that the front and rear end portions of the product remain as they are and the elastic elastic members 50, 50. It comes to stand by force.

  Members such as the top sheet 11, the second sheet 11 </ b> S, the back sheet 12, and the standing sheet 40 can be formed of a nonwoven fabric. As the nonwoven fabric, either natural fiber or synthetic fiber may be used. Examples of natural fibers include cotton, cellulose (wood pulp), wool, silk and the like. In addition, examples of synthetic fibers include polypropylene (PP), polyethylene (PE), nylon, polyester (PET), acrylic, and the like, and PE / PP mixed nonwoven fabric, PE / PET mixed nonwoven fabric, and combinations of the above materials as appropriate. Bicomponent fibers (mixed fibers) can also be used. In addition, as a method for producing a nonwoven fabric from these fibrous materials, a known method can be used as appropriate. For example, any method such as chemical bond, thermal bond, and spun lace may be used. Etc., any method such as a spun bond method, a melt blow method, or a combination of these and the above-described adhesion method may be used.

  When the back sheet 12 or the upright sheet 40 is formed of a nonwoven fabric, it is desirable to manufacture the back sheet 12 or the standing sheet 40 with a material having high hydrophobicity or water repellency, and the nonwoven fabric can be processed to increase hydrophobicity or water repellency. In the sheet formed double like the standing sheet 40 of this embodiment, it can also be made liquid-impermeable by inserting a liquid-impermeable film sheet between them. It is also preferable that the back sheet 12 and the upright sheet 40 have air permeability or vapor permeability. Moreover, the back sheet 12 and the upright sheet 40 do not need to be formed of a nonwoven fabric, and in this case, can be formed of a plastic film such as a polyethylene film.

  On the other hand, in order to tighten the diaper around the waist of the body, waist elastic elastic members 20F and 20B are stretched at the waist ends W of the abdominal side F and the back side B with a space parallel to the edge of the waist opening WO. It is fixed with. This fixing can be performed using a hot melt adhesive or the like. The elastic waist members 20F and 20B are preferably provided between the nonwoven fabrics 1A and 1B of the outer sheet 1 as schematically shown in FIG. 4, but are necessary when the outer sheet 1 is a single sheet. Accordingly, the outer sheet 1 can be fixed to the inner surface or the outer surface. The interval and the number of the waist elastic expansion / contraction members 20F and 20B can be appropriately determined. For example, the interval is about 4 to 8 mm, more preferably 4 to 7 mm, and the number is preferably about 4 to 10 mm. Further, as the elastic waist members 20F and 20B, those having a tensile stress in the range of 10 to 100 gf and particularly in the range of 10 to 50 gf at the time of 150% elongation are preferably used. When thread rubber is used for the elastic waist members 20F and 20B, the thickness is preferably 100 to 1000 dtex.

  In addition, a large number of back-side elastic elastic members 21 and 22 are fixed in an extended state to the main body portion T excluding the back-side waist end portion W, and a large number of main-body portions T excluding the abdominal side waist end portion W are also provided. The elastic side elastic member 23 is fixed in an extended state. This fixing can be performed using a hot melt adhesive or the like. Further, the ventral and dorsal elastic elastic members 21 to 23 are preferably provided between the non-woven fabrics 1A and 1B of the outer sheet 1 like the waist elastic elastic members 20F and 20B, but the outer sheet 1 is a single sheet. In some cases, the outer sheet 1 can be fixed to the inner surface or the outer surface as necessary.

  The interval and the number of the dorsal and ventral elastic elastic members 21 to 23 can be determined as appropriate. For example, the interval is 20 mm or less, more preferably 5.0 mm or less, and the number is about 10 to 30 in parallel. Is preferred. It is desirable that the mutual interval between the back-side and ventral-side elastic elastic members 21 to 23 is the same as or shorter than the interval between the waist elastic elastic members 20F, 20B. Further, it is desirable that the dorsal and ventral elastic elastic members 21 to 23 exist over a longitudinal range of 60% or more, desirably 70% or more, more preferably 90% or more of the main body portion T.

  Moreover, as the back side and ventral side elastic elastic members 21 to 23, the extension stress or the cross-sectional outer diameter is smaller than or substantially the same as those of the waist elastic elastic members 20F and 20B. Specifically, it is desirable that the stretching stress of the dorsal and ventral elastic elastic members 21 to 23 is in the range of 4 to 17 gf, particularly in the range of 5 to 10 gf at 150% elongation. When thread rubber is used as the dorsal and ventral elastic elastic members 21 to 23, those having a thickness of 100 to 1000 dtex or less, particularly 300 to 700 dtex are preferable.

  And in 1st Embodiment, although the back | dorsal elastic elastic member 21 which has an edge part in the waist part U extends linearly along the width direction over the width direction both sides edge, The back-side elastic elastic member 22 having an end portion extends between both side edges in the width direction, and obliquely extends from both side edges toward the center in the width direction and approaches the crotch 4 side as approaching the center in the width direction. It is extended. On the other hand, all of the abdominal elastic elastic member 23 extends linearly along the width direction across the widthwise side edges of the abdominal body portion T.

  In the paper diaper thus configured, as described above, high fit is exhibited around the abdomen, the buttocks and the legs, and leakage and misalignment are effectively prevented.

  In the disposable diaper according to the first embodiment, the diagonally arranged portion of the back elastic elastic member 22 has a portion 22s extending linearly from the side edge and an intermediate portion in the width direction that forms an arcuate curve that swells to the crotch side. 22c, the contraction force is difficult to concentrate at the center in the width direction, and it is difficult to swell. However, the present invention is not limited to this arrangement.

In the disposable diaper according to the first embodiment, the maximum longitudinal interval y1 of the adjacent back-side elastic elastic members 22 in the diagonally arranged portion is increased as it is closer to the crotch 4 side. Power is demonstrated, and higher fit is brought about. However, in the present invention, the maximum vertical interval y1 can be arbitrarily determined, and can be configured to be equal intervals, or can be narrowed as the crotch side is approached.

  Further, the longitudinal range of the diagonally arranged portion of the back elastic elastic member 22 of the present invention can be determined as appropriate, but in the normal case, the longitudinal direction between the position furthest from the crotch 4 and the position closest to the crotch 4 It is particularly preferable that the distance y2 is 1/50 to 1/2 times the longitudinal length of the back portion B in order to achieve the effects of the present invention.

(Second Embodiment)
In the second embodiment, as shown in FIG. 6, in order to provide the back side elastic stretchable member 22 having the diagonally arranged portion, the back side elastic stretch in a circular arc shape whose inclination decreases as it approaches the center in the width direction. The second embodiment is the same as the first embodiment except that the member 22 is arranged. The diagonally arranged portion of the back elastic elastic member 22 may be linear as in the first embodiment, but by forming a curved shape as in the second embodiment, The shrinkage force along the curved surface is exhibited, resulting in higher fit. In particular, as shown in the figure, a part of the back elastic elastic member 22 crosses the buttocks, but the other part of the back elastic elastic member 22 on the crotch 4 side has a curved shape that wraps around the bulge of the buttocks. It is preferable because it is remarkably excellent in fit.

(Third embodiment)
In the third embodiment, as shown in FIG. 7, the back elastic stretchable member 22 having the diagonally arranged portion has a predetermined length from the side edge portion toward the center, for example, 1/10 or less of the product width. The portion 22s extends along the width direction, and the width direction intermediate portion 22c extends obliquely linearly so as to approach the longitudinal crotch side as it approaches the center in the width direction. As can be seen from this, the back side elastic elastic member 22 having the obliquely arranged portion of the present invention may have a portion along the width direction.

  In the third embodiment, as shown in FIG. 7, the intermediate portion 22c in the width direction in the obliquely arranged portion is composed of only a straight portion, and has an arrangement shape that swells acutely toward the crotch 4 side. The back side elastic elastic member 22 which has the diagonal arrangement | positioning part of this invention can also be arrange | positioned in such a shape. The rest is the same as in the first embodiment, and a description thereof will be omitted.

(Fourth embodiment)
As shown in FIG. 8, the fourth embodiment is a form in which dorsal and ventral elastic elastic members 21 to 23 are not provided in a portion overlapping the absorber AB. Although not shown in the figure, the configuration in which the back elastic elastic members 21 and 22 and the abdominal elastic elastic member 23 are cut at a portion overlapping the absorber AB is also proposed as an effect similar to this. As for this cutting method, as disclosed in Japanese Patent Application Laid-Open No. 2002-178428, a plurality of points may be cut at a predetermined interval in the width direction, or only one point may be cut.

  Thus, when the elastic elastic members 21 to 23 are discontinuous at the portion overlapping the absorber AB, the contraction force acting on the absorber AB is weakened or eliminated, and the absorber AB contracts. Absorption inhibition is unlikely to occur.

  Alternatively, the width x (the cut portion is the same) of the portion where the dorsal and ventral elastic elastic members 21 to 23 are not provided can be determined as appropriate, but as illustrated, the width x becomes narrower as it approaches the crotch side. If it is comprised, elastic force will become strong toward the crotch side, and shrinkage | contraction of an absorber will be prevented. Therefore, it becomes possible to prevent the absorption capacity inhibition on the crotch side.

  Further, unlike the illustrated embodiment, only one of the back and ventral elastic elastic members 21 to 23 makes the elastic elastic members 21 to 23 discontinuous, or part of the dorsal or ventral elastic elastic members 21 to 23. Appropriate changes can be made, such as discontinuous only, or a combination of these to discontinue only some of the elastic elastic members on either the back side or the ventral side.

(About elastic elastic members)
As said elastic expansion-contraction member, what consists of elastic materials, such as urethane other than materials, such as natural rubber and a synthetic rubber, can be used. Further, as the shape of the elastic stretchable member, in addition to a thread or string shape, a narrow band shape, a wider film or sheet shape can also be used. A non-porous film or a perforated film can be selected as the film, and a mesh-like sheet can be selected as the sheet.

(Other)
The structure shown in each said embodiment can be combined with the other embodiment in part or all within the scope of the present invention.

It is an expanded state top view from the use surface side of a 1st embodiment. It is a deployment state top view from the outer surface side of a 1st embodiment. It is the III-III arrow line view. It is sectional drawing of an external sheet structure. It is a perspective view of 1st Embodiment product. It is an expanded state top view from the outer surface side of a 2nd embodiment. It is an expanded state top view from the outer surface side of a 3rd embodiment. It is an expanded state top view from the outer surface side of a 4th embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Outer sheet, 4 ... Inseam, 10 ... Absorption main body, 12 ... Back sheet, 13 ... Absorption core, AB ... Absorber, C ... Barrier cuff, 20F, 20B ... Waist elastic expansion-contraction member, 21, 22 ... Back side elasticity Telescopic member, 23 ... ventral elastic elastic member, T ... main body part, U ... lower waist, L ... crotch, W ... waist end, WO ... waist opening, LO ... leg opening.

Claims (7)

A pants-type disposable diaper in which the waist edge on the abdomen and both side edges of the lower waist and the waist edge on the back side and both edges of the lower waist are joined to form a waist opening and a pair of left and right leg openings In
From the back side width direction one side edge portion of the waist end to the other side edge portion, both the waist resilient and elastic members are secured in a stretched state, dorsal waist bottom and one side in the width direction definitive the crotch of from the edge to the other side edge, the one or more dorsal resilient and elastic members each being secured in a stretched state,
From the ventral side of the waist edges widthwise one side edge portion of the to the other side edge, both from the side edges waist definitive in lower width direction of one of the ventral side waist resilient and elastic members are secured in a stretched state to the other side edge, one or more ventral resilient and elastic members are secured in a stretched state,
The back elastic elastic member having ends at both side edges of the lower waist extends linearly along the width direction,
The back-side resilient and elastic members having ends on both side edges of the crotch portion, so as to approach the longitudinal crotch side as facing the widthwise center in the width direction both side edge portions, and closer to the widthwise center, buttocks Has a diagonally arranged portion extending along the lower leg base portion ,
All the ventral elastic elastic members extend linearly along the width direction,
Pants-type paper diaper characterized by that. With dorsal resilient and elastic members are provided vertically at an interval three or more having an end portion to the side edges of the crotch portion, the maximum longitudinal spacing of the back side elastic extensible members adjacent in the oblique placement portion The underpants type disposable diaper according to claim 1, which is wider as it is closer to the crotch side. In the diagonally arranged portion of the back elastic elastic member, the vertical distance between the position farthest from the crotch and the position closest to the crotch is 1/50 to 1/2 times the vertical length of the back side part. The underpants type paper diaper according to claim 1 which is made. The back side elastic stretchable member is
Whether it is provided in a pattern consisting of a part extending linearly from the side edge and an intermediate part in the width direction forming a circular arc shape that swells to the crotch side,
The whole is provided in an arc-curved pattern in which the inclination decreases as it approaches the center in the width direction, or extends along the width direction for a predetermined length from the side edge toward the center, and the width direction The underpants type disposable diaper according to any one of claims 1 to 3, wherein the middle part is provided in a pattern extending in a diagonally straight line so as to approach the longitudinal crotch side as it approaches the center in the width direction . Absorber along the longitudinal direction with provided in the width direction intermediate portion, in a portion overlapping the absorber dorsal resilient and elastic members and the front resilient and elastic members are cut, and the back side elastic stretchable member and the front elastic The width of the cut portion of the expansion / contraction member is configured to be narrower as it approaches the longitudinal crotch side , or the back side elastic expansion / contraction member and the ventral side elastic expansion / contraction member are not provided, and the back side elastic expansion / contraction member and the ventral side The underpants type disposable diaper according to any one of claims 1 to 4, wherein a width of a portion where no elastic elastic member is provided is configured to become narrower as it approaches the longitudinal crotch side . Longitudinal length of the waist end portion is 15 to 40 mm, longitudinal length of the waist bottom is 65～120Mm, and the longitudinal length of said crotch section is 100 to 400 mm, according to claim 2 Pants-shaped paper diapers as described. As the dorsal elastic elastic member and ventral elastic elastic member, 10 to 30 thread rubbers having a thickness of 100 to 1000 dtex are provided on the dorsal side and the ventral side with a space of 5.0 mm or less between each other . The underpants type paper diaper of any one of Claims 1-6.

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