JP2009165839A - Disposable pants type paper diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable pants type paper diaper which looks good, is easy to wear, is resistant to slip itself down, and is excellent in fitting feel. <P>SOLUTION: A waist-down-part elastic members 21F, 21B are prepared to have a lateral length of 60% or more relative to a waistline T and a vertical length of 50-150 mm. The contract product width is adjusted to have a difference of 150-200 mm between a maximum stretch width of a waistline T, when the waistline T stretches laterally as far as its limit and the contract product width when the waistline is unstretched while a front body F is overlapped on a rear body B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pants-type disposable paper diaper, in particular, a waist opening and left and right leg openings are formed in a use state, and at least a lower waist portion of a waist part in a length range from the waist opening edge to the leg opening start end. The present invention relates to a pants-type disposable paper diaper having a stretchable part in which a stretchable member is disposed along a circumferential direction and a non-stretchable part in which a stretchable member is not disposed.

  In recent years, pants-type disposable paper diapers have been widely used. In this case, the elastic member is usually made of rubber thread, particularly around the waist, and this thread rubber is unevenly distributed on the waist opening edge side of the waist part (the area in the length range from the waist opening edge to the leg opening start end). Generally, the arrangement interval is 10 mm or more. Usually, the arrangement interval of the waist opening is small, and the arrangement interval of the lower waist (the crotch side portion from the waist opening) is increased in order to prevent excessive compression of the abdomen. However, the disadvantage of this type of product is that it has a bad appearance. In view of this, a pants-type disposable paper diaper has been proposed in which an area having no elastic member is provided around the waist portion to prevent generation of wrinkles having a bad appearance.

  This type of pants-type disposable paper diaper looks very good, however, this type of pants-type disposable paper diaper may be difficult or difficult to use or fall off in some cases. In addition, a desired fit may not be obtained.

  SUMMARY OF THE INVENTION Accordingly, the present invention is to provide a pants-type disposable paper diaper that solves these problems, has a good appearance, is easy to use or wear when used, and has an excellent fit without slipping off.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
Waist opening and left and right leg openings are formed by joining both side edges of the front and back bodies,
The absorbent core extends from the front body to the back body along the center in the width direction, and both side portions in the width direction are formed by the sheet, and are portions having no absorption core,
Of the waistline portion that is defined as the length range from the waist opening edge to the leg opening start end, the waist portion that is the portion on the waist opening edge side has a plurality of longitudinally spaced intervals along the circumferential direction. A waist elastic member is disposed, and the lower waist which is a longitudinal length range including a part of the absorbent core, the lower waist elastic member is disposed at intervals in the longitudinal direction along the circumferential direction,
The lower waist has a non-stretchable portion in the center in the width direction, and a region including both side portions in the width direction excluding the non-stretchable portion is a stretchable portion by the lower waist stretchable member.
The lower waist elastic member of the lower waist is made of rubber thread, and is provided over 60% of the waistline and over a longitudinal length range of 50 to 150 mm.
In the state where the front body and the back body are overlapped, the maximum product width when the waistline portion is stretched to the stretch limit in the product width direction and the contracted product width when the waistline portion is in a non-stretched contracted state A pants-type disposable paper diaper characterized by having a difference of 150 to 200 mm.
(Function and effect)
When the product is viewed, the conspicuous part is the central part (the central part in the circumferential direction). In the present invention, the non-stretchable part is located in the central part of at least one of the front body and the back body. The appearance of the product is excellent. Furthermore, the deformation of the absorber present in the central portion is prevented. Moreover, the waist part extends in the product width direction to the stretch limit in a state where the stretch part is in a region including the left and right side parts excluding the non-stretch part and the front body and the back body are overlapped. When the difference between the maximum product width at the time and the contracted product width when the waistline portion is in a non-stretched contracted state is 150 to 200 mm, it is easy to wear or peel off and has an excellent fit.

<Invention of Claim 2>
The maximum product width when the waistline portion is extended to the extension limit in the product width direction is 300 to 400 mm, and the total length in the circumferential direction of the non-stretchable portion is 15 to 40% of the waistline circumference length. The pants-type disposable paper diaper according to claim 1.
(Function and effect)
When the numerical range is limited, the operational effect of claim 1 is further clarified.

<Invention of Claim 3>
The underpants-type disposable paper diaper according to claim 2, wherein a ratio of a length at a maximum extension to a length of a normal state contracted in the lower waist elastic member is 250 to 350%.
(Function and effect)
When the numerical range is limited, the function and effect in claim 2 are further clarified.

<Invention of Claim 4>
When the waistline portion is stretched in the product width direction with the front body and the back body being overlapped, the stretch force in the product width direction of the waistline portion is contracted by 100 mm with respect to the maximum product width at the stretch limit. The pants-type disposable diaper according to claim 2 or 3, which is in the range of 300 to 600 gf and in the range of 50 to 300 gf in a state of being contracted by 150 mm with respect to the maximum product width at the stretch limit.
(Function and effect)
The product width of the waistline when the stretchable part is in a region including the left and right side parts excluding the non-stretchable part and the waistline is extended in the product width direction with the front body and the back body overlapped The stretching force in the direction is in the range of 300 to 600 gf when contracted 100 mm with respect to the maximum product width at the extension limit, and 50 to 300 gf when contracted 150 mm with respect to the maximum product width at the extension limit. By adopting the range, it is easy to wear or peel off and has an excellent fit.

<Invention of Claim 5>
The pants-type disposable paper diaper according to any one of claims 1 to 4, wherein a mass of the lower waist elastic member is 0.05 to 0.13 g per 100 mm x 100 mm of the stretchable portion in the stretch limit state.

(Function and effect)
By setting the mass of the stretchable member to 0.05 to 0.13 g per 100 mm × 100 mm of the stretchable portion in the stretch limit state, the stretchable member is easier to wear or peel off and has an excellent fit.

<Invention of Claim 6>
The waist lower elastic member at the lower waist has a vertical arrangement interval of 7.0 mm or less and is equal to or shorter than the arrangement interval of the waist elastic member. Pants-type disposable paper diapers.

(Function and effect)
When the vertical arrangement interval is 7.0 mm or less, and the same or shorter than the arrangement interval of the waist elastic members, the wrinkles are not noticeable and are fine even if they are visible, and are generally flat. It has a planar outer surface and is refreshing, that is, the outer surface of the product does not “moco-mom” and is excellent in appearance.

<Invention of Claim 7>
The tensile stress and the cross-sectional outer diameter of the lower waist elastic member are smaller than the tensile stress and the cross-sectional outer diameter of the waist elastic member, and the thickness of the lower hip elastic member is 620 dtex or less. The underpants-type disposable paper diaper according to any one of the above.

(Function and effect)
The effect in Claims 1-5 becomes still clearer if the said numerical range is limited.

  As described above, according to the present invention, wrinkles are not conspicuous, and the appearance of the product is neat, and the advantages of being easy to wear or wear, and excellent fit are provided.

It is a top view from the expansion | deployment state use surface side of 1st Embodiment for the vocabulary description of this invention. It is a top view from the deployment state use surface side of a 1st embodiment. It is the 5-5 line arrow directional view. It is a perspective view of 1st Embodiment product. It is a generation | occurrence | production status schematic diagram of the wrinkle of this invention product. It is explanatory drawing of the arrangement | positioning form of an expansion-contraction member. It is a figure which shows the example of a design of the front and back of a product. It is a top view from the expansion | deployment state use surface side of embodiment provided with another expansion-contraction member. It is a top view from the expansion | deployment state use surface side of embodiment provided with the other expansion-contraction member.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
("Explanation of terms of the present invention" and a first embodiment of a pants-type disposable diaper)
The pants-type disposable diaper according to the first embodiment will be described with reference to FIG. 2 and FIG. 3 while the terms related to the parts and directions of the present invention will be mainly described with reference to FIG.

  As shown in FIGS. 1 and 2, the pants-type disposable diaper according to the first embodiment is fixed to the flexible outer sheet 1 and the inner surface of the outer sheet 1, and has a longitudinal direction centered on the crotch 4 ( The main component is an absorption main body 10 extending in the front-rear direction.

  The outer sheet 1 is formed by laminating and fixing two or three or more breathable / water-repellent nonwoven fabrics. At the final stage of the manufacturing process after the outer sheet 1 and the absorbent main body 10 are superposed, By joining the entire longitudinal direction of both side edges with the back body B by means such as ultrasonic sealing or heat melting (this joint is denoted by reference numeral 30), a waist opening as shown in FIG. WO and a pair of left and right leg openings LO are formed.

  In the code | symbol of FIG. 1, "vertical direction" means the direction which connects an abdominal side and a back side, and "circumferential direction" means the direction orthogonal to the said vertical direction. “Waist opening edge” means the edge of the waist opening WO, and “Leg opening edge” means the edge of the leg opening LO. “Leg opening start end” means a position where the leg opening edge of the leg opening LO intersects the joint 30 and the start point of the leg opening edge. "Torso circumference part" T means the whole area | region of the length range from a waist opening edge to a leg opening start end. The waistline portion T can be conceptually divided into a “waist portion” W and a “lower waist” U. These longitudinal lengths vary depending on the size of the product, but the waist portion W is 15 to 40 mm and the lower waist portion U is 65 to 120 mm.

  Further, “product width” in the present invention means a distance between both side edges at the time of product. In the case where the product width of the waistline portion is different between the waist portion W and the lower waist U, the width in the lower waist U is particularly set. The product width direction is a direction along the product width. In FIG. 4, the product width is indicated by PW and the product width direction is indicated by pw. Therefore, the maximum product width is the product width when the waistline portion T is pulled in the product width PW direction and the stretchable portion is extended to the extension limit when the front body and the back body are stacked. is there. In addition, the contraction width is a product width when the stretchable part is in a contracted state where the front body and the back body are overlapped and the stretchable part is not expanded.

  On the other hand, the sum of the circumferential lengths of the non-stretchable parts referred to in the present invention means the sum of the respective circumferential lengths when the non-stretchable parts are present in the front body and the back body, respectively. In the case where the non-stretchable part exists only in one place, it is the length in the circumferential direction.

  “Crotch” L means the entire region of the length range that forms the leg opening LO. Further, the “center portion” means an intermediate region excluding the side portion including the center line of the product. The “side portions” mean both side portions of the waistline portion T.

  As shown in FIG. 3, the absorbent main body 10 is mainly composed of a rectangular liquid-permeable top sheet 11 made of a nonwoven fabric or the like that directly touches the wearer's skin and cotton-like pulp, and has a certain degree of rigidity (semi-rigid). ) Absorber AB composed of a rectangular absorbent core 13 and a rectangular crepe paper 14 wrapped around the upper and lower surfaces thereof, and a rectangle composed of a polyethylene plastic film etc. reaching the vicinity of both side edges on the back surface of the absorber AB. The liquid-permeable top sheet 11 wraps around the side edges of the absorber AB and reaches the back surface, and is superimposed on the liquid-impermeable back sheet 12. These elements are integrated by bonding with a hot-melt adhesive (indicated by * in the figure is the bonding portion). If necessary, a liquid-permeable second sheet 11S can be interposed between the liquid-permeable top sheet 11 and the crepe paper 14 as illustrated. The absorbent main body 10 is integrated by adhering the entire back surface to the outer sheet 1 with a hot melt adhesive.

  Standing cuffs C and C around the legs projecting to the use surface side are formed on both sides of the absorbent main body 10, respectively. The standing cuffs C include a standing sheet 40 that is substantially continuous in the width direction, an elastic member, for example, It is composed of one elastic rubber member 50, 50 ... as shown in the figure.

  In more detail, the standing cuff C is formed by doubling the standing sheet 40 and wrapping each of the elastic members 50, 50... With a hot melt adhesive or the like. The standing sheet 40 forming each standing cuff C, C is preferably not liquid-permeable but liquid-permeable or hydrophobic. Moreover, you may make it become a property which repels a liquid by a silicon process etc. with respect to liquid-permeable sheets, such as a nonwoven fabric. Furthermore, it is desirable to have air permeability or vapor permeability.

  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. As a result, the fixed start end of the double upright sheet 40 forms the upright end of the upright cuff C.

  The tip side from the standing end is a free part that is not fixed to the product body.

  On the other hand, at the front and rear end portions in the longitudinal direction, the free portion is fixed to the article, specifically to the outer surface of the liquid-permeable top sheet 11, with the tip thereof toward the center side of the article by hot melt adhesive or the like. Yes.

  Further, the basic configuration is that at least one of the elastic members 50, 50... Is in the free part, but in particular, the elastic member 50 is preferably at the tip of the free part, and is further shown in FIG. As shown, it is preferable to have the elastic member 50 also on the base side. It is further desirable to have a plurality of tip portions as shown in the figure.

  FIG. 2 shows a state in which the paper diaper is expanded in the longitudinal direction. At the time of wearing, the paper diaper is attached to the body in a boat shape, and the contraction force of each of the elastic members 50, 50. The standing cuff C is erected by the contraction force of each of the elastic members 50, 50. At this time, the side portion of the absorbent main body 10 is deformed and lifted, and the absorber AB is lifted while being slightly deformed to form a deep pocket space.

  The space surrounded by the left and right standing cuffs C, C forms a urine or soft stool confinement space. When urinating into this space, the urine is absorbed into the absorbent body AB through the liquid-permeable top sheet 11, and the standing cuff C becomes a barrier for the solid matter of loose stool, and the overpass is prevented. The

  On the other hand, at the longitudinal ends of the front body F and the back body B, between the nonwoven fabrics of the outer sheet 1 in the waist W, the gap is parallel to the edge of the waist opening WO in order to enhance the fit around the waist. The waist elastic members 20F and 20B made of thin thread rubber are placed and fixed under extension so that they extend. Although the space | interval and the number of waist elastic members 20F and 20B in the waist part W can be determined suitably, for example, about 4-8 mm is preferable as an interval, and about 4-10 is preferable as the number.

  And under such a configuration, according to the present invention, the lower abdomen of the front body F and the buttocks of the back body B in the lower waist U, which is the region between the waist part W and the crotch L of the front body F and the back body B, Lower waist elastic members 21F and 21B are provided along the circumferential direction. The lower waist elastic members 21F and 21B are the left and right sides of the product excluding almost the entire absorbent core 13 in the part from the joint part 30 on one side to the joint part 30 on the other side in the front body F and the back body B, respectively. It is provided on the side. At this time, considering the form of a general pants-type disposable paper diaper, it is desirable that the vertical width of the stretchable portion provided with the lower waist stretchable members 21F and 21B is 50 to 150 mm. In addition, it is desirable that the non-stretchable portions where the lower waist elastic members 21F and 21B are not provided have a total circumferential length of 15 to 40% of the waist circumference.

  Further, according to the present invention, the maximum product width and the waistline T when the front body F and the backbody B are overlapped with each other and the waistline T is extended to the extension limit in the product width direction are in an unstretched contracted state. The difference between the width of the contracted product at a certain time is 100 to 250 mm, particularly preferably 150 to 200 mm, or the waistline portion in the product width direction in a state where the front body and the back body are overlapped. The stretching force in the product width direction of the waistline when stretched is in the range of 300 to 600 gf in a state of contracting 100 mm with respect to the maximum product width at the stretch limit, and with respect to the maximum product width at the stretch limit. It is made to become the range of 50-300gf in the state contracted 150mm. This can be achieved, for example, by the following configuration.

  In the case of a general pants-type disposable paper diaper, the maximum product width is desirably 300 to 400 mm. Moreover, it is desirable that the mass of the waist elastic member in the stretchable part is 0.05 to 0.13 g per 100 mm × 100 mm of the stretchable part in the stretch limit state.

  On the other hand, the mutual interval between the lower waist elastic members 21F and 21B is the same as or shorter than the interval between the waist elastic members 20F and 20B. In addition, the thread rubber used as the lower waist elastic members 21F and 21B has an elongation stress and a cross-sectional outer diameter smaller than or substantially the same as the thin rubber thread used as the waist elastic member 20 described above. Preferably, the maximum stretched length is 250-350%, especially 250-300% of the contracted normal length.

  In the illustrated example, as the lower waist elastic members 21F and 21B, thin rubber threads, specifically, elastic members having a thickness of 620 dtex or less are used. In both the front body F and the back body B, the vertical spacing is provided. Is set to 7.0 mm or less, and 15 to 40 pieces are arranged and fixed between the nonwoven fabrics of the outer sheet 1 in parallel. In this way, as schematically shown in FIG. 5, the generated wrinkles are narrow in the circumferential direction, the length is short in the vertical direction (direction perpendicular to the circumferential direction), and the wrinkles are substantially continuous in the vertical direction. It generates in the form to do. And the concave or convex of each ridge is very small. Moreover, there is almost no constriction at the thread rubber g portion, and it is difficult to determine the presence of the thread rubber g when the color of the sheet constituting the outer surface and the color of the thread rubber g are the same color.

  As a result, the wrinkle is inconspicuous and is a fine wrinkle even if it is visible, and it has a flat outer surface as a whole. It becomes a paper diaper. And by making it press against the skin as a surface, there is no generation of rubber marks because there is no local excessive pressure on the skin, and the friction between the inner surface of the product and the skin reaches the whole, The close contact provides good fit and prevents product slippage.

  On the other hand, in the first embodiment, the crotch elastic member 23 is also provided in the left and right parts excluding the central part in the crotch part L. As for the crotch elastic member 23, similarly to the lower waist elastic members 21F and 21B, an elastic member having a thickness of 620 dtex or less can be disposed and fixed between the nonwoven fabrics with a vertical interval of 7.0 mm or less.

  The pants-type disposable paper diaper configured in this way has a maximum product width and waistline when the waistline T extends to the stretch limit in the product width direction with the front body F and the backbody B overlapped. The difference between the contracted product width when T is in a non-stretched contracted state is 100 to 250 mm, and the waistline T is stretched in the product width direction with the front body F and the back body B overlapped. The expansion / contraction force in the product width direction of the waist part T is in the range of 300 to 600 gf in a state where the product is contracted by 100 mm with respect to the maximum product width at the extension limit, and contracts by 150 mm against the maximum product width at the extension limit Since the product is in the range of 50 to 300 gf in the state of being applied, it is easy to flake or wear and is excellent in fit.

(Other embodiments)
The present invention has at least a waist part U having a stretchable part in which a stretchable member is disposed along the circumferential direction and a non-stretchable part in which a stretchable member is not disposed. The arrangement of the members is not particularly limited. In addition, the non-stretchable portion only needs to be in the central portion of at least one of the front body F and the back body B. Therefore, the arrangement form of the stretchable members can be made different between the front body F and the back body B. . Here, embodiments of the present invention other than the embodiment shown in Example 1 are shown in FIGS.

  In the form of (A), the arrangement of the waist elastic members 20F and 20B is the same as that of the first embodiment, and the crotch elastic member 23 is not provided. In the form of (B), the arrangement of the crotch elastic member 23 is the same as that of the first embodiment, and the waist elastic members 20F and 20B are arranged in the central part of both the front body F and the back body B. It is a form that is not done. The form of (C) is a form in which the waist elastic members 20F and 20B are not arranged in the central part in the front body F and the back body B, and the crotch elastic member 23 is not arranged. In the form of (D), the arrangement of each elastic member in the front body F is the same as in (B), but in the back body B, the lower waist elastic member 21B is also arranged in the center part. Yes. Thus, it is added that the arrangement form of the elastic members is appropriate. Further, in the present invention, the ends of the lower waist elastic members 21F and 21B or the end of the crotch elastic member 23 overlap the side edge of the absorbent core 13 and do not reach the side edge of the absorbent core 13. Including both cases.

  In the above example, the rectangular absorbent main body 10 is joined to the substantially hourglass-shaped outer sheet 1, but a liquid-permeable top sheet 11 having the same shape as the outer sheet 1 is provided, and the absorbent body AB is interposed between them. May be provided. Furthermore, the external sheet 1 and the absorbent main body 10 may be integrated with no boundary.

  In the above example, the sheet constituting the outer surface of the product is obtained by laminating and fixing two or more breathable / water-repellent nonwoven fabrics, but it may be a single nonwoven fabric, in which case the nonwoven fabric is used. An elastic member can be joined to the side. Furthermore, a plastic sheet can be interposed between the laminated nonwoven fabrics, or can be bonded to the use surface side of the backside nonwoven fabric.

  The lower waist elastic member 21F or the lower waist elastic member 21B may be arranged in a lattice network. One example of this is the form shown in (E).

  On the other hand, as shown in FIG. 7, a design such as a character can be applied to the back side of the liquid-impermeable back sheet 12 by, for example, printing in the center of the product (substantially the entire area of the absorbent core). This design portion has an absorption core 13 having a certain degree of rigidity, and the outer shape sheet 1 does not deform or cause wrinkles according to the present invention, so that the design can be clearly seen without breaking. It becomes. In this way, anyone can discriminate between front and back at a glance, making changing diapers fun and making the wearer happy. It is also possible to interpose a designed design sheet between the external sheets 1. In addition, design printing can be performed on the outer sheet 1.

(About elastic members)
As the elastic member, in addition to materials such as natural rubber and synthetic rubber, elastic elastic materials such as urethane can be used. A thin elastic band or a sheet having a large area can also be used. Examples of these include a band such as urethane, a film or a sheet. 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. An example of the arrangement of the non-porous film 60 is shown in FIG. Moreover, the example of arrangement | positioning of the mesh-shaped film 61 was shown in FIG. Also in these embodiments, the difference between the configuration according to the present invention, that is, the product width in the normal state in which the stretchable portion is contracted and the product width in the maximum stretched state in which the stretchable portion is extended to the maximum in the circumferential direction is 100. The elastic force of the waist part of the product is in the range of 300 to 600 gf when it is reduced to 100 mm from the maximum extended state where the elastic part is extended to the maximum in the circumferential direction. It is important that the expansion / contraction force of the waist portion of the product is in the range of 50 to 300 gf.

  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 member, 21F, 21B ... Lower waist elastic member , 23 ... Crotch elastic member, T ... waist circumference, U ... lower waist, L ... crotch, W ... waist, WO ... waist opening, LO ... leg opening.

Claims (7)

Waist opening and left and right leg openings are formed by joining both side edges of the front and back bodies,
The absorbent core extends from the front body to the back body along the center in the width direction, and both side portions in the width direction are formed by the sheet, and are portions having no absorption core,
Of the waistline portion that is defined as the length range from the waist opening edge to the leg opening start end, the waist portion that is the portion on the waist opening edge side has a plurality of longitudinally spaced intervals along the circumferential direction. A waist elastic member is disposed, and the lower waist which is a longitudinal length range including a part of the absorbent core, the lower waist elastic member is disposed at intervals in the longitudinal direction along the circumferential direction,
The lower waist has a non-stretchable portion in the center in the width direction, and a region including both side portions in the width direction excluding the non-stretchable portion is a stretchable portion by the lower waist stretchable member.
The lower waist elastic member of the lower waist is made of rubber thread, and is provided over 60% of the waistline and over a longitudinal length range of 50 to 150 mm.
In the state where the front body and the back body are overlapped, the maximum product width when the waistline portion is stretched to the stretch limit in the product width direction and the contracted product width when the waistline portion is in a non-stretched contracted state A pants-type disposable paper diaper characterized by having a difference of 150 to 200 mm. The maximum product width when the waistline portion is extended to the extension limit in the product width direction is 300 to 400 mm, and the total length in the circumferential direction of the non-stretchable portion is 15 to 40% of the waistline circumference length. The pants-type disposable paper diaper according to claim 1. The underpants-type disposable paper diaper according to claim 2, wherein a ratio of a length at a maximum extension to a length of a normal state contracted in the lower waist elastic member is 250 to 350%. When the waistline portion is stretched in the product width direction with the front body and the back body being overlapped, the stretch force in the product width direction of the waistline portion is contracted by 100 mm with respect to the maximum product width at the stretch limit. The pants-type disposable diaper according to claim 2 or 3, which is in the range of 300 to 600 gf and in the range of 50 to 300 gf in a state of being contracted by 150 mm with respect to the maximum product width at the stretch limit. The pants-type disposable paper diaper according to any one of claims 1 to 4, wherein a mass of the lower waist elastic member is 0.05 to 0.13 g per 100 mm x 100 mm of the stretchable portion in the stretch limit state. The waist lower elastic member at the lower waist has a vertical arrangement interval of 7.0 mm or less and is equal to or shorter than the arrangement interval of the waist elastic member. Pants-type disposable paper diapers. The tensile stress and the cross-sectional outer diameter of the lower waist elastic member are smaller than the tensile stress and the cross-sectional outer diameter of the waist elastic member, and the thickness of the lower hip elastic member is 620 dtex or less. The underpants-type disposable paper diaper according to any one of the above.

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