JP2021053366A - Underpants type absorbent article - Google Patents

Abstract

To provide an underpants type absorbent article in which the positions of an opening end of a ventral part and an opening end of a dorsal part in a waist opening are difficult to shift and leakage is unlikely to occur when it is worn.SOLUTION: In an underpants type absorbent article 1A of the present invention, a curved line 4 defining a leg opening LH has a convex shape toward a center line L1 extending in a longitudinal direction X in an unfolded state where it is cut open along a side seal portion S and extended to the maximum. The shortest portion 5 of the distance between the curved lines 4 in a lateral direction Y is located on a dorsal part R side of a center line L2 extending in the lateral direction Y. At least a part of a convex portion 41 of the curved line 4 located on the dorsal part R side has a convex shape toward the center line L2 extending in the lateral direction Y.SELECTED DRAWING: Figure 2

Description

The present invention relates to pants-type absorbent articles such as pants-type disposable diapers.

Various improvements in the configuration of the exterior body have been studied in order to prevent the pants-type disposable diaper from shifting from the proper position and leaking during wearing. For example, Patent Document 1 describes a pants-type disposable diaper in which an elastic member is arranged at a predetermined position on the exterior body and the tensile load of the waist portion of the diaper is within a predetermined range for the purpose of preventing the diaper from being displaced. It is disclosed. Patent Document 2 discloses a pants-type disposable diaper in which a plurality of laterally extending tacks are formed on the dorsal side of the exterior body for the purpose of preventing deterioration of wearability and body retention.

Japanese Unexamined Patent Publication No. 2004-236832 Japanese Unexamined Patent Publication No. 2012-239555

In general, the human body has a large amount of meat on the dorsal side of the thighs, and the buttocks have a business trip shape. In conventional diapers, the length of the dorsal diaper in the exterior body is set to be greater than the length of the ventral diaper in consideration of the shape of the wearer's body and the elongation of the skin due to movement. It is also designed to be long and cover the buttocks. As a result, the leg opening is placed closer to the ventral side. The pants-type disposable diapers described in Patent Documents 1 and 2 also have leg openings arranged closer to the ventral side. In a diaper designed in this way, when worn, the ventral opening at the waist opening shifts downward compared to the dorsal opening, and the ventral and dorsal ends of the diaper are open. The position tends to be different. If the position of the opening end on the ventral side and the position of the opening end on the dorsal side are different, the absorber cannot be placed in an appropriate position, and there is a risk of leakage.

Therefore, the subject of the present invention is that the position of the ventral opening end and the dorsal opening end of the waist opening does not easily shift when the article is worn, and the wearing method is the same as that of the conventional diaper. The present invention relates to providing a pants-type absorbent article that can realize the above and is less likely to cause leakage.

The present invention has a ventral portion arranged on the ventral side of the wearer at the time of wearing, a dorsal portion arranged on the dorsal side of the wearer, and a crotch portion located between them, and the inseam from the ventral side portion. It has a vertical direction extending to the dorsal side through the portion and a horizontal direction orthogonal to the vertical direction, and both sides of the ventral side and both sides of the dorsal side are joined. A pants-type absorbent article in which a pair of side seals, a waist opening and a pair of leg openings are formed.
When the absorbent article is cut open along the side seal portion and extended to the maximum extent, it is in a deployed state.
The contour line defining the leg opening has a convex shape toward the center line extending in the vertical direction of the absorbent article in the unfolded state.
The shortest portion of the lateral distance between the contour lines is located on the dorsal side of the center line extending in the lateral direction of the absorbent article in the unfolded state.
Provided is a pants-type absorbent article in which at least a part of the contour line located on the dorsal side has a convex shape toward a laterally extending center line of the absorbent article in the deployed state. It is a thing.

The present invention also includes an absorbent body having a liquid-retaining absorber and an exterior body arranged on the non-skin facing surface side of the absorbent body.
It has a ventral portion arranged on the ventral side of the wearer at the time of wearing, a dorsal portion arranged on the dorsal side of the wearer, and a crotch portion located between them. It has a longitudinal direction extending to the dorsal side and a lateral direction orthogonal to the longitudinal direction, and both sides of the ventral side and both sides of the dorsal side are joined to form a pair of side seals. A pants-type absorbent article in which a portion, a waist opening and a pair of leg openings are formed.
The entire surface of the exterior body is formed of a member having elasticity in the lateral direction.
When the absorbent article is cut open along the side seal portion and the exterior body is opened in a relaxed state, it is in a deployed state.
The contour line defining the leg opening has a convex shape toward the center line extending in the vertical direction of the absorbent article in the unfolded state.
The shortest lateral portion of the contour lines is located on the dorsal side of the laterally extending center line of the absorbent article in the unfolded state.
Provided is a pants-type absorbent article in which at least a part of the contour line located on the dorsal side has a convex shape toward a laterally extending center line of the absorbent article in the deployed state. It is a thing.

According to the pants-type absorbent article of the present invention, when the article is worn, the positions of the ventral opening end and the dorsal opening end of the waist opening are unlikely to shift, and leakage is unlikely to occur.

FIG. 1 is a perspective view schematically showing an embodiment of the pants-type absorbent article of the present invention. FIG. 2 is a developed plan view schematically showing the skin facing surface side (inner surface side) in the expanded state in which the diaper shown in FIG. 1 is expanded and extended to the maximum. FIG. 3 is a plan view schematically showing a relaxed state of another embodiment of the pants-type absorbent article of the present invention. FIG. 4 is a plan view schematically showing the exterior body in the fully extended state, and FIGS. 4 (a) to 4 (c) are the states in which the exterior body used in Examples 1 to 3 is fully extended. 4 (d) is a plan view of the exterior body used in Comparative Example 1 in a state of being extended to the maximum. FIG. 5 is a side view of a disposable diaper of an embodiment worn on a lower body human body model.

Hereinafter, the present invention will be described based on the preferred embodiment with reference to the drawings. 1 and 2 show a pants-type disposable diaper 1A, which is an embodiment of the present invention. As shown in FIGS. 1 and 2, the diaper 1A is provided between the ventral portion F arranged on the ventral side of the wearer and the dorsal portion R arranged on the dorsal side of the wearer when the diaper 1A is worn. It has a crotch M located at. The ventral portion F and the dorsal portion R are waist circumferences arranged around the wearer's waist when wearing the diaper 1A. The diaper 1A has a vertical direction X corresponding to the front-back direction of the wearer, that is, a direction extending from the ventral side F to the dorsal side R via the crotch portion M, and a lateral direction Y orthogonal to the vertical direction X. .. The diaper 1A includes an absorbent main body 2 and an exterior body 3 arranged on the non-skin facing surface side of the absorbent main body 2.

In the present specification, the "skin facing surface" is a surface facing the wearer's skin side when the diaper is worn, that is, a relative wearer when focusing on the disposable diaper or its constituent members (for example, an absorbent body). The "non-skin facing surface" is the surface of the disposable diaper or its components that faces the opposite side of the skin when the disposable diaper is worn, that is, relatively far from the wearer's skin. On the side.

In the diaper 1A, both side portions of the ventral side portion F and both side portions of the dorsal side portion R of the exterior body 3 are joined to each other by a joining means such as an adhesive, a heat seal, or an ultrasonic seal. As shown in FIG. 1, the diaper 1A has a pair of side seal portions S and S, a waist opening WH through which the wearer's body is passed, and a pair of leg openings LH through which the wearer's lower limbs are passed. , LH is formed in a diaper type.

As shown in FIG. 2, in the unfolded state in which the diaper 1A is cut open and extended to the maximum along the side seal portion S, the absorbent main body 2 has a substantially rectangular shape long in the vertical direction X. The absorbent body 2 is arranged in the region from the ventral side F to the dorsal side R of the exterior body 3. The "maximum extended unfolded state" of the diaper 1A means that the diaper 1A is separated by the side seal portion S to be in the unfolded state, and the unfolded diaper 1A is expanded to the maximum elastic member of each part to design dimensions (elasticity). It refers to the state in which it is expanded to the same size as when it is expanded in a plane with the influence of the members completely eliminated). The absorbent body 2 is arranged at the center of the exterior body 3 in the lateral direction Y. The absorbent body 2 is joined to the exterior body 3 by a joining means such as an adhesive.

As shown in FIG. 2, the absorbent body 2 includes a liquid-permeable front sheet 21 that forms a skin-facing surface and a liquid-impermeable or liquid-impervious back sheet that forms a non-skin-facing surface (not shown). ), And a liquid-retaining absorber 23 interposed between the sheets 21 and 22, and these are integrated by a known joining means such as an adhesive.

As shown in FIG. 2, the absorbent main body 2 has a pair of leakage-proof cuffs 24, 24 on both sides along the vertical direction X on the skin facing surface. In the vicinity of the free end of each leak-proof cuff 24, one or more thread-shaped elastic members 25 for forming the leak-proof cuff are arranged in an extended state along the vertical direction X. The leak-proof cuff 24 is adapted to stand up at least at the inseam M by contracting the elastic member 25 arranged in the extended state when the diaper 1A is worn. As a result, excrement such as urine is prevented from flowing out laterally Y.

As the front surface sheet 21, the back surface sheet (not shown), the absorber 23, and the elastic member 25, the same ones conventionally used for absorbent articles such as disposable diapers can be used without particular limitation. For example, as the surface sheet 21, a non-woven fabric having a single-layer or multi-layer structure, a perforated film, or the like can be used. As the back sheet (not shown), a moisture-permeable resin film or the like can be used. As the absorber 23, one in which an absorbent core made of an absorbent material composed of particles of the absorbent polymer and a fiber material is coated with tissue paper can be used. As the sheet forming the leak-proof cuff 24, a liquid-resistant or water-repellent and breathable sheet can be used. As the elastic member 25, thread rubber or the like can be used.

The exterior body 3 is a member arranged on the non-skin facing surface side of the absorbent body 2. In the fully extended unfolded diaper 1A shown in FIG. 2, the exterior body 3 extends outward from the peripheral edge of the absorbent body 2. That is, the exterior body 3 defines the outer shape of the diaper 1A in the fully extended state. The exterior body 3 includes an outer layer sheet 31 forming the outer surface of the diaper 1A, an inner layer sheet 32 arranged on the skin-facing surface side of the outer layer sheet 31, and each part fixed in an stretched state between these two sheets. It consists of an elastic member. The outer layer sheet 31 and the inner layer sheet 32 have the same shape and the same size. Between these sheets 31 and 32, a waist elastic member 33 that forms waist gathers on the peripheral edge of the waist opening WH, a leg elastic member 34 that forms leg gathers on the peripheral edge of the leg opening LH, and A waistline elastic member 35 that forms waistline gathers is arranged around the waistline. The elastic members 33, 34, and 35 are respectively joined to at least one of the outer layer sheet 31 and the inner layer sheet 32 by an arbitrary joining means such as a hot melt type adhesive in an elongated state.

The outer layer sheet 31 and the inner layer sheet 32 may be the same type of sheets or different types of sheets. The sheets 31 and 32 are typically not stretchable, but may be stretchable. Examples of the sheet having no elasticity include non-woven fabrics produced by various manufacturing methods. Specific examples thereof include spunbonded non-woven fabric, melt-blown non-woven fabric, air-through non-woven fabric, and needle-punched non-woven fabric. As the elastic members 33 to 35, the same elastic members 25 as those described above can be used.

As shown in FIG. 2, when the diaper 1A is in the fully extended state, the inseam M is larger than the ventral side F and the dorsal side R on the side edge along the vertical direction X in the contour of the diaper 1A. It has a shape that is convexly curved toward the center line L1. The center line L1 is a virtual line that extends along the vertical direction X and bisects the diaper 1A in the horizontal direction Y. The side edge of the diaper 1A has a curved line 4 at the inseam M. The curved line 4 is a contour line that defines the leg opening LH, and has a shape that is convexly curved toward the center line L1. In the diaper 1A, the side edge of the crotch portion M of the exterior body 3 is located outside the lateral direction Y with respect to the side edge of the absorbent body 2 along the vertical direction X. As a result, the curved line 4 of the diaper 1A is formed only by the side edges of the exterior body 3.

When the diaper 1A in the state shown in FIG. 2 is viewed along the lateral direction Y, the diaper 1A has the shortest portion 5 which is the shortest distance among the pair of curved lines 4 and 4. .. In the present embodiment, the shortest portion 5 exists in the exterior body 3. The shortest portion 5 is located on the dorsal side R side of the center line L2. The center line L2 is a virtual line that extends along the horizontal direction Y and bisects the diaper 1A in the vertical direction X. The "distance between the pair of curved lines 4 and 4" is the length between the intersections of the pair of curved lines 4 and 4 and the virtual line extending parallel to the center line L2. According to the diaper 1A of the present embodiment in which the shortest portion 5 is located on the back side R side of the center line L2, when the diaper 1A is worn, both legs of the wearer are based on the position of the shortest portion 5. Since it fits within the leg opening LH, the ventral side F of the diaper 1A is less likely to shift to the center line L2 side when worn. As a result, the absorber 23 can be positioned at an appropriate position on the wearer's body, and leakage is less likely to occur.

The shortest portion 5 is located on the dorsal side R side of the center line L2 only on the side edge of the exterior body 3 in the fully extended state as in the diaper 1A shown in FIG. When the curved line 4 is formed, the convex curved line 4 has only one narrowest point P1 and the shortest portion 5 can be drawn as one line connecting the narrowest points P1. It means that the position of the line is located on the dorsal side R side of the center line L2. (2) The shortest portion 5 cannot be drawn as a single line. For example, the portion of the convex curved line 4 closest to the center line L1 extends parallel to the center line L1, and the shortest portion connecting the portions is the shortest. When the portion 5 has a constant length along the vertical direction X (for example, as in the diaper 1B shown in FIG. 3 described later, the curved line 4 is a part of the side edge of the exterior body 3 and the absorbent main body. When it is formed by a part of the side edge along the vertical direction X in 2), the position of the center of the length along the vertical direction X in the shortest portion 5 is the back side portion R from the center line L2. It means that it is located on the side. (3) Even if the shortest portion 5 can be drawn as one line, for example, the convex curved line 4 has a plurality of narrowest points, and the shortest portion 5 can be drawn as a plurality of lines connecting the narrowest points. Occasionally, it means that the position that bisects the distance between the line on the most ventral side F side and the line on the most dorsal side R side is located on the dorsal side R side of the center line L2.

The exterior body 3 includes (i) an elastic elastic element (an elastic member in a laterally extended state is arranged and fixed between two sheets in the lateral direction Y, as in the diaper 1A of the present embodiment, or other than this. , At least an elastic sheet having elasticity in the lateral direction) is used only for a part of the diaper, or (ii) the elastic elastic element is ventral as in diaper 1B described later. Examples thereof include those used in the entire area from the portion F to the dorsal portion R.

The above-mentioned (1), (2) and (3) regarding the fact that the shortest portion 5 is located on the dorsal portion R with respect to the center line L2 will be described with reference to the above. As for the above (1), that is, the shortest portion 5 can be drawn as one line, (1a) the outer body 3 is formed by the above (i), and (1b) the outer body 3 is the above (ii). ), And the curved line 4 is formed as described in (1) above in the form formed only by the side edges of the exterior body in the state where the curved line 4 is extended to the maximum. The state in which the elastic sheet is fully extended means a state in which the elastic sheet is extended to the maximum and expanded to the design dimensions.

Assuming that (2), that is, the shortest portion 5 cannot be drawn as a single line and the shortest portion 5 has a constant length along the vertical direction X, the exterior body 3 (2a) is described in (2a). An example is an example in which the portion of the curved line 4 extending parallel to the center line L1 formed by i) is formed only by the side edges of the exterior body in the state of being extended to the maximum. Further, (2b) the exterior body 3 is composed of the above-mentioned (i), and has a rectangular shape that is wider in the horizontal direction Y than the narrowest point of the outer body in the fully extended state and long in the vertical direction X. For example, in a diaper on which an absorbent body is arranged, a form in which a portion of the curved line 4 extending parallel to the center line L1 is formed by a side edge of the absorbent body can be exemplified. Further, the exterior body (2c) is composed of the above-mentioned (i), and is divided into a dorsal exterior body arranged on the back side of the wearer and a ventral exterior body arranged on the ventral side. In a diaper in which an absorbent main body is bridged and fixed between the dorsal exterior body and the ventral outer body, a portion of the curved line 4 extending parallel to the center line L1 is a side edge of the absorbent main body. The form formed by the above can be exemplified. Further, (2d) the exterior body 3 is composed of the above (ii), and the portion of the curved line 4 extending parallel to the center line L1 is only the side edge of the exterior body in the state of being extended to the maximum. The form formed by the above can be exemplified. Further, (2e) the exterior body 3 is composed of the above-mentioned (ii), and has a rectangular shape that is wider in the horizontal direction Y and longer in the vertical direction X than the narrowest point of the outer body in the fully extended state. In a diaper on which a sex body is arranged, a form in which a portion of the curved line 4 extending in parallel with the center line L1 is formed by a side edge of the absorbent body can be exemplified.

As for the above-mentioned (3), that is, the one having a plurality of the shortest portions 5 that can be drawn as one line, the (3a) exterior body 3 is composed of the above-mentioned (i), and is a curved line having a plurality of narrowest points. The form formed on the side edge of the exterior body in which 4 is extended to the maximum, (3b) The exterior body 3 is composed of the above (ii), and the curved line 4 having a plurality of narrowest points is the maximum. An example thereof is a form formed on the side edge of the exterior body in a stretched state.

In the diaper 1A in the state shown in FIG. 2, the portion of the curved line 4 located on the dorsal side R side of the center line L2 is a convex portion having a convex shape toward the center line L2 at least in part. Has 41. According to the diaper 1A of the present embodiment having the convex portion 41 on the dorsal side R side, the buttocks of the wearer can be covered with the convex portion 41 while wearing the diaper. As described above, in the diaper 1A, the shortest portion 5 is located on the dorsal side R side of the center line L2, and the diaper 1A has a convex portion 41 on the dorsal side R side of the curved line 4. As a result, when the diaper 1A of the present embodiment is worn, the positions of the ventral F-side opening end and the dorsal R-side opening end of the waist opening WH are less likely to shift. Due to the suppression of such displacement, when the diaper 1A is worn, the absorbent body 2 is unlikely to be displaced from the proper position on the wearer's body, and the absorbent body 23 is suitable for the wearer's body. Can be placed in any position. This makes it less likely that excrement will leak from the diaper.

The fact that the convex portion 41 has a convex shape toward the center line L2 means that the curved line 4 is formed only by the side edges of the exterior body 3 as in the diaper 1A of the embodiment shown in FIG. When the convex curved line 4 has only one narrowest point P1, the narrowest point P1 and the curved line 4 are terminated on the dorsal side R side at one leg opening LH. It means that the convex portion 41 has a shape protruding toward the center line L2 side from the virtual line L3 connecting the dorsal end portion S1. (2) When the curved line 4 does not have a single narrowest point, for example, the portion of the convex curved line 4 closest to the center line L1 extends parallel to the center line L1. The convex portion 41 protrudes toward the center line L2 from the virtual line connecting the position on the most dorsal side R side of the portion and the dorsal end portion S1 where the curved line 4 terminates on the dorsal side R side. It means that it is a shape. (3) Even if the curved line 4 has the narrowest point, for example, when the convex curved line 4 has a plurality of narrowest points, the dorsal side R side of the plurality of narrowest points This means that the convex portion 41 protrudes toward the center line L2 from the virtual line connecting the narrowest point and the dorsal end portion S1 where the curved line 4 terminates on the dorsal side R side. ..

In the diaper 1A, as shown in FIG. 2, the convex portion 41 on the dorsal side R side has a shape that draws a smooth curve protruding from the virtual line L3 toward the center line L2 side. The convex portion 41 preferably has a shape protruding from the dorsal end portion S1 of the curved line 4 toward the center line L2.
On the other hand, in the diaper 1A, the portion of the curved line 4 located on the ventral side F side of the narrowest point P1 does not have a portion having a convex shape toward the center line L2. Specifically, the portion located on the ventral side F side of the narrowest point P1 starts from the ventral end portion F1 at which the curved line 4 terminates on the ventral side F side, and extends parallel to the center line L2. It has a straight line portion 42 and an oblique portion 43 connecting the inward end point of the straight line portion 42 and the narrowest point P1. The oblique portion 43 extends obliquely with respect to the center line L1 so that the distance from the center line L1 gradually shortens from the ventral side F side toward the dorsal side R side.
When the intersection of the curved line 4 and the portion forming the convex portion 41 and the virtual line L3 is K, the portion of the curved line 4 between the intersection K and the narrowest point P1 is the virtual line L3. It draws a smooth curve protruding from the center line L1 side, and has a concave shape toward the center line L2. The portion of the curved line 4 located on the ventral side F side of the narrowest point P1 may have a portion having a concave shape toward the center line L2.

From the viewpoint of reliably covering the buttocks with the convex portion 41 when the diaper 1A is worn, the area of the portion where the convex portion 41 protrudes from the virtual line L3 is 700 mm when the diaper 1A is for infants. preferably ² or more, further preferably 800 mm ² or more, and preferably 1200 mm ² or less, still more preferably 1100 mm ² or less. When the diaper 1A is for adults, the area is ^{preferably 3000 mm 2} or more, more preferably 3500 mm ² or more, preferably 4500 mm ² or less, and 4000 mm ² or less. Is more preferable.

From the viewpoint of further enhancing the effect of preventing leakage described above, in the diaper 1A, the shortest portion 5 among the distances between the pair of curved lines 4 and 4 and the center line L2 extending in the lateral direction Y The distance D1 is preferably in the following range with respect to the maximum length D2 along the vertical direction X of the diaper 1A.
Regardless of whether the diaper 1A is for infants or adults, the value of (D1 / D2) × 100, which is the ratio of the distance D1 to the maximum length D2, is preferably 1% or more, and is preferably 3%. More preferably, it is more preferably 10% or less, and further preferably 8% or less. Similarly, the value of (D1 / D2) × 100, which is the ratio, is preferably 1% or more and 10% or less, and more preferably 3% or more and 8% or less.
When the diaper 1A is for infants, the distance D1 is preferably 4 mm or more, more preferably 15 mm or more, preferably 60 mm or less, and 50 mm or less from the same viewpoint as described above. Is more preferable. The distance D1 is preferably 4 mm or more and 60 mm or less, and more preferably 15 mm or more and 50 mm or less.
When the diaper 1A is for adults, the distance D1 is preferably 5 mm or more, more preferably 15 mm or more, more preferably 80 mm or less, and 60 mm or less from the same viewpoint as described above. Is more preferable. The distance D1 is preferably 5 mm or more and 80 mm or less, and more preferably 15 mm or more and 60 mm or less.

In the diaper 1A, as shown in FIG. 2, the curved line 4 is located on the ventral side F side of the curved line 4 with respect to the length D3 of the dorsal part 4R located on the dorsal side R side. It is preferable that the length D4 of the ventral part 4F is longer. By doing so, the ventral part 4F fits along the wearer's inguinal region, and the dorsal part 4R fits the shape of the buttocks, and as a result, the displacement of the leg opening LH during wearing is suppressed. This is because the diaper 1A is prevented from being displaced when it is worn. The length D3 of the dorsal portion 4R means the length of the dorsal portion R side portion of the total length along the curved line 4 defining one leg opening LH with respect to the center line L2. The length D4 of the ventral portion 4F means the length of the ventral portion F side of the total length with respect to the center line L2.
Regardless of whether the diaper 1A is for infants or adults, the ratio of the length D4 of the ventral part 4F to the length D3 of the dorsal part 4R (D4 / D3) × 100 is 101. % Or more, more preferably 110% or more, still more preferably 130% or less, still more preferably 120% or less. The value of (D4 / D3) × 100, which is the ratio, is preferably 101% or more and 130% or less, and more preferably 110% or more and 120% or less.

When the intersection of the portion forming the convex portion 41 and the virtual line L3 of the curved line 4 is K, the length of the line segment connecting the narrowest point P1 and the intersection K is t1 and the dorsal end portion. When the length of the line segment connecting S1 and the intersection K is t2 and the maximum distance between the virtual line L3 and the convex portion 41 is t3, t1, t2 and t3 have the following relationship. However, it is preferable from the viewpoint of surely covering the buttocks with the convex portion 41 when the diaper is worn.
Regardless of whether the diaper 1A is for infants or adults, the shorter the t1 is, the more preferable it is, and the t1 is preferably 0. The value of (t1 / t2) × 100, which is the ratio of t1 to t2, is preferably 10% or less, and more preferably 5% or less. The value of (t3 / t2) × 100, which is the ratio of t3 to t2, is preferably 10% or more, more preferably 15% or more, and preferably 30% or less, and 25% or less. Is more preferable.

Next, the pants-type disposable diaper 1B of another embodiment of the pants-type absorbent article of the present invention will be described with reference to FIG. The diaper according to another embodiment will be described with respect to the difference from the diaper according to the above-described embodiment. The points not particularly described are the same as those of the diaper according to the above-described embodiment, and the description of the diaper is appropriately applied.

The exterior body 3 according to the diaper 1B of another embodiment is formed of a member having elasticity in the lateral direction Y over the entire area from the ventral side F to the dorsal side R of the exterior body 3. In the state before joining with the absorbent main body 2, the entire area of the exterior body 3 can be expanded and contracted in the lateral direction Y. "Stretchability" means a property that can be stretched in a predetermined direction and contracts when the stretch is released. As the stretchable sheet that can be used for the stretchable exterior body 3, various known stretchable sheets can be used. For example, it is produced by the method for producing an elastic sheet described in JP-A-2008-179128, an elastic sheet described in JP-A-2007-22066, and an elastic non-woven fabric described in JP-A-2007-2266. Stretchable non-woven fabric, Japanese Patent No. 3054930, and the like can be used.

The diaper 1B shown in FIG. 3 is an unfolded state in which the exterior body 3 is cut open along the side seal portion S and is relaxed. The relaxed state is a natural state in which the diaper 1B is separated by the side seal portion S and unfolded, and the elastic sheet and the elastic member forming the exterior body 3 are not stretched without applying an external force. Means that. In the relaxed state of the diaper 1B, as shown in FIG. 3, the curved line 4 defining the leg opening LH is curved in a convex arc shape toward the center line L1 extending in the vertical direction X. It has a convex shape. In the diaper 1B, a part of the side edge of the crotch portion M of the exterior body 3 is located inward in the lateral direction Y with respect to the side edge of the absorbent body 2 along the vertical direction X. As a result, the curved line 4 is formed by a part of the side edge of the exterior body 3 and a part of the side edge of the absorbent body 2 along the vertical direction X.

In the relaxed diaper 1B shown in FIG. 3, the portion of the convex curved line 4 closest to the center line L1 is formed by the side edge of the absorbent body 2 along the vertical direction X, and the portion is the center. It has a shape that extends parallel to the line L1. The shortest portion 5 connecting the portions has a constant length along the vertical direction X, and the position P2 at the center of the shortest portion 5 in the vertical direction X is located on the dorsal side R side of the center line L2. ing. As a result, the shortest portion 5 of the diaper 1B is located on the dorsal side R side of the center line L2 extending in the lateral direction Y. According to such a diaper 1B, when worn, both legs of the wearer fit within the leg opening LH with reference to the position of the shortest portion 5, so that the ventral portion F of the diaper 1B is centered on the legs. It becomes difficult to shift to the line L2 side.

In the relaxed diaper 1B shown in FIG. 3, the portion of the convex curved line 4 closest to the center line L1 extends parallel to the center line L1. A part of the curved line 4 is the center line rather than the virtual line L4 connecting the position P3 on the most dorsal side R side in the portion and the dorsal end portion S1 in which the curved line 4 terminates on the dorsal side R side. A convex portion 41 is formed so as to project toward the L2 side. As a result, according to the diaper 1B of the present embodiment, the buttocks of the wearer can be covered with the convex portion 41 while wearing the diaper, and the dorsal portion R of the diaper 1B is on the center line L2 side when wearing the diaper. It becomes difficult to shift to. Like the diaper 1A, the diaper 1B has the shortest portion 5 located on the dorsal side R side of the center line L2, and has a convex portion 41 on the dorsal side R side. As a result, when the diaper 1B of the present embodiment is worn, the positions of the opening end on the ventral side F side and the opening end on the dorsal side R side in the waist opening WH are less likely to shift. Due to the suppression of such displacement, when the diaper 1B is worn, the absorbent body 2 is unlikely to be displaced from the proper position on the wearer's body, and the absorbent body 23 is suitable for the wearer's body. Can be placed in any position. This makes it less likely that excrement will leak from the diaper.

The above-mentioned (1) shortest part 5 can be drawn as one line, (2) the shortest part 5 cannot be drawn as one line, and the shortest part 5 has a constant length along the vertical direction X. The present form and (3) the form in which the curved line 4 is formed so that a plurality of shortest portions 5 that can be drawn as one line can be drawn will be described by taking a relaxed diaper as an example.
Examples of the exterior body 3 include those whose entire area is formed of a member having elasticity in the lateral direction Y. For example, an elastic elastic element (an elastic member in a lateral direction Y extension state is arranged between two sheets). In addition to this, those in which at least an elastic sheet having elasticity in the lateral direction (such as an elastic sheet) is used in the entire diaper.

As the above (1), the exterior body 3 (1c) is composed of the elastic elastic element used in the entire area, and the curved line 4 is formed only by the side edge of the exterior body in the relaxed state. In this form, an example in which a curved line is formed as described in (1) above can be exemplified.

As the above (2), the form of the diaper 1B (2f) in which the exterior body 3 is composed of the elastic elastic element used in the entire area, that is, the inseam M of the exterior body 3 in the relaxed state. A part of the side edge in the absorbent body 2 is located inward in the horizontal direction Y with respect to the side edge along the vertical direction X in the absorbent body 2, and as a result, the curved line 4 becomes a part of the side edge of the exterior body 3. , A form in which a portion formed by a part of the side edge of the absorbent body 2 and extending parallel to the center line L1 on the curved line 4 is formed by the side edge of the absorbent body 2 can be exemplified. Further, (2 g) the exterior body 3 is composed of the elastic elastic element used in the entire area, and the side edge of the relaxed exterior body 3 in the crotch portion M is the vertical direction X in the absorbent body 2. A form in which a portion of the curved line 4 extending parallel to the center line L1 which is located laterally Y outward from the side edge along the line 4 is formed only by the side edge of the exterior body in a relaxed state. It can be illustrated.

As the above (3), the exterior body 3 (3c) is composed of the elastic elastic element used in the entire area, and the curved line 4 having a plurality of narrowest points is the exterior in a relaxed state. Examples include morphology formed on the side edges of the body.

In the diaper 1A of the embodiment shown in FIG. 2 and the diaper 1B of the embodiment shown in FIG. 3, the elastic force of the exterior body 3 may be different for each part. By doing so, when the diapers 1A and 1B are worn, the absorber 23 is more likely to be arranged at an appropriate position on the wearer's body.
In particular, the lateral elongation rate of the exterior body 3 at the position where the shortest portion 5 of the exterior body 3 exists is defined as S1, and the region between the pair of convex contour lines of the exterior body 3 ( When the elongation rate of the exterior body 3 in the region indicated by reference numeral 37 in FIGS. 2 and 3 is S2, the difference between S1 and S2 is absorbed in the wearing state of the diapers 1A and 1B. It is preferable because the body 23 is more easily arranged at an appropriate position on the wearer's body. From the viewpoint of making this advantage more remarkable, S1 is preferably larger than S2, and more preferably the value of S1 / S2 is 1.2 or more, particularly 1.3 or more, particularly 1.4 or more, and 1 It is 0.8 or less, especially 1.7 or less, especially 1.6 or less. Specifically, the value of S1 / S2 is preferably 1.2 or more and 1.8 or less, more preferably 1.3 or more and 1.7 or less, and 1.4 or more and 1.6 or less. Is even more preferable.

The elongation rates S1 and S2 are both measured by the following methods.
First, mark 50 mm in the width direction in the relaxed state. Next, stretch the mark to the point where it can be fully extended by hand, and measure its length (A). The elongation rate is calculated from the following formula.
(Elongation rate) = (A) mm / 50 mm x 100 (%)

The relative magnitude relationship between the elongation rates S1 and S2 is as described above, and the value of the elongation rate S1 itself is preferably 170% or more from the viewpoint of allowing the diapers 1A and 1B to have an underwear-like appearance. More preferably 190% or more, still more preferably 210% or more, still more preferably 300% or less, still more preferably 280% or less, still more preferably 260% or less, and preferably 170% or more and 300% or less, further. It is preferably 190% or more and 280% or less, and more preferably 210% or more and 260% or less.

On the other hand, the value of the elongation rate S2 itself is preferably 120% or more, more preferably 140% or more, still more preferably 160, from the viewpoint of sufficiently holding the buttocks of the wearer with the outer body when the diapers 1A and 1B are worn. % Or more, more preferably 240% or less, still more preferably 220% or less, still more preferably 200% or less, still more preferably 120% or more and 240% or less, still more preferably 140% or more and 220% or less, still more preferably. Is 160% or more and 200% or less.

Although the present invention has been described above based on the preferred embodiment thereof, the present invention is not limited to the diapers 1A and 1B of the embodiment and can be appropriately modified. For example, in the diapers 1A and 1B, in the deployed state, the exterior body 3 was continuous over the ventral side F, the crotch part M, and the dorsal side R, but the exterior body 3 was arranged on the back side of the wearer. It may be divided into a dorsal exterior body and a ventral exterior body arranged on the ventral side. In this case, the absorbent body is bridged and fixed between the dorsal exterior and the ventral exterior.

The diaper 1A shown in FIG. 2 was described in the unfolded state in which the exterior body 3 was maximized, and the diaper 1B shown in FIG. 3 was described in the unfolded state in which the exterior body 3 was relaxed. The curved line 4 that defines the leg opening LH is in the vertical direction X of the diaper in the unfolded state, regardless of whether the unfolded state in which the 3 is fully extended or the unfolded state in which the exterior body 3 is relaxed. It has a convex shape toward the extending center line L1, and the shortest portion 5 of the curved lines 4 and 4 in the lateral direction Y is on the back side R side of the center line L2 extending in the lateral direction Y of the unfolded diaper. It is preferable that at least a part of the curved line 4 located on the back side R side has a convex shape toward the center line L2 extending in the lateral direction Y of the diaper in the deployed state. With such a configuration, when the diaper is worn, the positions of the ventral F-side opening end and the dorsal R-side opening end of the waist opening WH are less likely to shift.

Further, the pants-type absorbent article of the present invention may be a pants-type disposable diaper for infants or adults, a pants-type sanitary napkin, or the like. The following additional notes will be further disclosed with respect to the above-described embodiments of the present invention.

<1>
It has a ventral portion arranged on the ventral side of the wearer at the time of wearing, a dorsal portion arranged on the dorsal side of the wearer, and a crotch portion located between them. It has a longitudinal direction extending to the dorsal side and a lateral direction orthogonal to the longitudinal direction, and both sides of the ventral side and both sides of the dorsal side are joined to form a pair of side seals. A pants-type absorbent article in which a portion, a waist opening and a pair of leg openings are formed.
When the absorbent article is cut open along the side seal portion and extended to the maximum extent, it is in a deployed state.
The contour line defining the leg opening has a convex shape toward the center line extending in the vertical direction of the absorbent article in the unfolded state.
The shortest portion of the lateral distance between the contour lines is located on the dorsal side of the center line extending in the lateral direction of the absorbent article in the unfolded state.
A pants-type absorbent article in which at least a part of the contour line located on the dorsal side has a convex shape toward a center line extending laterally of the absorbent article in the deployed state.
<2>
The pants-type absorbent article includes an absorbent body having a liquid-retaining absorbent body and an exterior body arranged on the non-skin facing surface side of the absorbent body.
The contour line is composed of only the exterior body, and the contour line is composed of only the exterior body.
When the absorbent article is cut open along the side seal portion and extended to the maximum extent, it is in a deployed state.
The pants-type absorbent article according to <1>, wherein the narrowest point between the contour lines is one place, and the shortest portion can be drawn as one line connecting the narrowest points.
<3>
The pants-type absorbent article includes an absorbent body having a liquid-retaining absorbent body and an exterior body arranged on the non-skin facing surface side of the absorbent body.
The contour line is composed of only the exterior body, and the contour line is composed of only the exterior body.
When the absorbent article is cut open along the side seal portion and extended to the maximum extent, it is in a deployed state.
When there are a plurality of narrowest points between the contour lines and the shortest portion can be drawn as a plurality of lines connecting the narrowest points, the line on the ventral side of the plurality of lines is the most. The pants-type absorbent article according to <1>, wherein the position that bisects the distance from the line on the dorsal side is located on the dorsal side of the center line extending in the lateral direction. ..
<4>
The pants-type absorbent article includes an absorbent body having a liquid-retaining absorbent body and an exterior body arranged on the non-skin facing surface side of the absorbent body.
When the absorbent article is cut open along the side seal portion and extended to the maximum extent, it is in a deployed state.
When the portion of the contour line closest to the center line extending in the vertical direction extends parallel to the center line and the shortest portion connecting the portions has a constant length in the vertical direction, the shortest portion is formed. The pants-type absorbent article according to <1>, wherein the position of the center of the length of the portion in the vertical direction is located on the dorsal side of the center line extending in the lateral direction.
<5>
The contour line is formed by a part of the side edge of the exterior body and a part of the side edge of the absorbent body.
The pants-type absorbent article according to <4>, wherein the portion having the shortest portion having a constant length in the vertical direction is formed on the side edge of the absorbent body.
<6>
The pants-type absorbent article includes an absorbent body having a liquid-retaining absorbent body and an exterior body arranged on the non-skin facing surface side of the absorbent body.
When the absorbent article is cut open along the side seal portion and extended to the maximum extent, it is in a deployed state.
The contour line has a convex portion having a convex shape toward a center line extending in the lateral direction on the exterior body.
The convex portion according to any one of <1> to <5>, which protrudes from the lower end on the center line side extending in the lateral direction at the side edge of the dorsal side of the exterior body along the longitudinal direction. Pants type absorbent goods.
<7>
Assuming a virtual line connecting the lower end of the side edge of the dorsal portion of the exterior body and the position corresponding to the shortest portion, the virtual line and the convex portion of the contour line The pants-type absorbent article according to <6>, wherein the portion connecting the intersection and the position corresponding to the shortest portion has a concave shape toward the center line extending in the lateral direction.
<8>
The area of the portion where the convex portion protrudes from the virtual line ^{is preferably 700 mm 2} or more and 1200 mm ² or less, preferably 800 mm ² or more, when the pants-type absorbent article is for infants. The pants-type absorbent article according to <7>, which is more preferably 1100 mm ^{2 or less.}
<9>
The area of the portion where the convex portion protrudes from the virtual line ^{is preferably 3000 mm 2} or more and 4500 mm ² or less, preferably 3500 mm ² or more, when the pants-type absorbent article is for an adult. The pants-type absorbent article according to <7>, which is more preferably 4000 mm ^{2 or less.}
<10>
The ratio of the length t1 of the line segment connecting the shortest portion and the intersection to the length t2 of the line segment connecting the lower end and the intersection at the side edge of the dorsal portion of the exterior body. The pants-type absorbent article according to <7>, wherein the value of (t1 / t2) × 100 is preferably 10% or less, more preferably 5% or less.

<11>
The distance between the shortest portion and the center line extending in the lateral direction of the absorbent article in the unfolded state is 1% or more and 10% or less with respect to the maximum vertical length of the absorbent article in the unfolded state. , The pants-type absorbent article according to any one of <1> to <10>.
<12>
The distance between the shortest portion and the center line extending in the lateral direction is preferably 4 mm or more and 60 mm or less, and 15 mm or more and 50 mm or less when the pants-type absorbent article is for infants. The pants-type absorbent article according to <11>, which is more preferable.
<13>
The distance between the shortest portion and the center line extending in the lateral direction is preferably 5 mm or more and 80 mm or less, and 15 mm or more and 60 mm or less when the pants-type absorbent article is for adults. The pants-type absorbent article according to <11>, which is more preferable.
<14>
A portion of the contour line located on the ventral side of the length D3 of the portion located on the dorsal side, with reference to the center line extending laterally of the absorbent article in the deployed state. The pants-type absorbent article according to any one of <1> to <13>, wherein the length D4 is longer.
<15>
The value of (D4 / D3) × 100, which is the ratio of the length D4 of the part located on the ventral side to the length D3 of the part located on the dorsal side, is 101% or more and 130% or less. The pants-type absorbent article according to <14>, wherein the content is preferably 110% or more and 120% or less.
<16>
An absorbent body having a liquid-retaining absorber and an exterior body arranged on the non-skin facing surface side of the absorbent body and defining the outer shape of the absorbent article are provided.
The exterior body is formed of a member having elasticity in the lateral direction.
The lateral elongation rate of the exterior body at the position where the shortest portion of the exterior body exists is defined as S1.
When the elongation rate of the exterior body in the region between the pair of convex contour lines of the exterior body is S2,
The pants-type absorbent article according to any one of <1> to <15>, wherein S1 is larger than S2.

<17>
An absorbent body having a liquid-retaining absorber and an exterior body arranged on the non-skin facing surface side of the absorbent body are provided.
It has a ventral portion arranged on the ventral side of the wearer at the time of wearing, a dorsal portion arranged on the dorsal side of the wearer, and a crotch portion located between them. It has a longitudinal direction extending to the dorsal side and a lateral direction orthogonal to the longitudinal direction, and both sides of the ventral side and both sides of the dorsal side are joined to form a pair of side seals. A pants-type absorbent article in which a portion, a waist opening and a pair of leg openings are formed.
The entire surface of the exterior body is formed of a member having elasticity in the lateral direction.
When the absorbent article is cut open along the side seal portion and the exterior body is opened in a relaxed state, it is in a deployed state.
The contour line defining the leg opening has a convex shape toward the center line extending in the vertical direction of the absorbent article in the unfolded state.
The shortest lateral portion of the contour lines is located on the dorsal side of the laterally extending center line of the absorbent article in the unfolded state.
A pants-type absorbent article in which at least a part of the contour line located on the dorsal side has a convex shape toward a center line extending laterally of the absorbent article in the deployed state.
<18>
The pants-type absorbent article includes an absorbent body having a liquid-retaining absorbent body and an exterior body arranged on the non-skin facing surface side of the absorbent body.
The contour line is composed of only the exterior body, and the contour line is composed of only the exterior body.
When the absorbent article is cut open along the side seal portion and the exterior body is opened in a relaxed state, it is in a deployed state.
The pants-type absorbent article according to <17>, wherein the narrowest point between the contour lines is one place, and the shortest portion can be drawn as one line connecting the narrowest points.
<19>
The pants-type absorbent article includes an absorbent body having a liquid-retaining absorbent body and an exterior body arranged on the non-skin facing surface side of the absorbent body.
The contour line is composed of only the exterior body, and the contour line is composed of only the exterior body.
When the absorbent article is cut open along the side seal portion and the exterior body is opened in a relaxed state, it is in a deployed state.
When there are a plurality of narrowest points between the contour lines and the shortest portion can be drawn as a plurality of lines connecting the narrowest points, the line on the ventral side of the plurality of lines is the most. The pants-type absorbent article according to <17>, wherein the position that bisects the distance from the line on the dorsal side is located on the dorsal side of the center line extending in the lateral direction. ..
<20>
The pants-type absorbent article includes an absorbent body having a liquid-retaining absorbent body and an exterior body arranged on the non-skin facing surface side of the absorbent body.
When the absorbent article is cut open along the side seal portion and the exterior body is opened in a relaxed state, it is in a deployed state.
When the portion of the contour line closest to the center line extending in the vertical direction extends parallel to the center line and the shortest portion connecting the portions has a constant length in the vertical direction, the shortest portion is formed. The pants-type absorbent article according to <17>, wherein the position of the center of the length of the portion in the vertical direction is located on the dorsal side of the center line extending in the lateral direction.
<21>
The contour line is formed by a part of the side edge of the exterior body and a part of the side edge of the absorbent body.
The pants-type absorbent article according to <20>, wherein the portion having the shortest portion having a constant length in the vertical direction is formed on the side edge of the absorbent body.

<22>
The pants-type absorbent article includes an absorbent body having a liquid-retaining absorbent body and an exterior body arranged on the non-skin facing surface side of the absorbent body.
When the absorbent article is cut open along the side seal portion and the exterior body is opened in a relaxed state, it is in a deployed state.
The contour line has a convex portion having a convex shape toward a center line extending in the lateral direction on the exterior body.
The convex portion according to any one of <17> to <21>, which protrudes from the lower end on the center line side extending in the lateral direction at the side edge of the dorsal side of the exterior body along the longitudinal direction. Pants type absorbent goods.
<23>
Assuming a virtual line connecting the lower end of the side edge of the dorsal portion of the exterior body and the position corresponding to the shortest portion, the virtual line and the convex portion of the contour line The pants-type absorbent article according to <22>, wherein the portion connecting the intersection and the position corresponding to the shortest portion has a concave shape toward the center line extending in the lateral direction.
<24>
The exterior body defines the outer shape of the absorbent article.
The lateral elongation rate of the exterior body at the position where the shortest portion of the exterior body exists is defined as S1.
When the elongation rate of the exterior body in the region between the pair of convex contour lines of the exterior body is S2,
The pants-type absorbent article according to <17>, wherein S1 is larger than S2.
<25>
The pants-type absorbent article includes an absorbent body having a liquid-retaining absorbent body and an exterior body arranged on the non-skin facing surface side of the absorbent body.
The exterior body is divided into a dorsal exterior body arranged on the back side of the wearer and a ventral exterior body arranged on the ventral side, and the dorsal exterior body and the ventral exterior body are arranged. The pants-type absorbent article according to <1> or <17>, wherein the absorbent body is bridged and fixed between the two.
<26>
The pants-type absorbent article includes an absorbent body having a liquid-retaining absorbent body and an exterior body arranged on the non-skin facing surface side of the absorbent body.
The side edge of the exterior body along the longitudinal direction has a shape in which the crotch portion is convexly curved toward a center line extending in the longitudinal direction from the ventral side portion and the dorsal side portion, and the absorbency is described. The pants-type absorbent article according to <1> or <17>, wherein the main body is arranged and fixed to the central portion of the exterior body.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the scope of the present invention is not limited to such examples.
[Example 1]
The elastic sheet described in JP-A-2008-179128 was used as the exterior body. The extension direction of the elastic filament 13 in the elastic sheet 10 described in the same publication was made to coincide with the lateral direction of the disposable diaper, the elastic sheet was expanded to the design size, and cut into the shape shown in FIG. 4 (a). Instead of the outer body of "Relief (registered trademark) super-thin type underwear M to L size", which is a disposable diaper manufactured by Kao Corporation, the above-mentioned outer body was used to obtain a precursor of a pants-type disposable diaper. This precursor is for adults. The shortest portion of this precursor is on the dorsal side. The distance D1 between the shortest part and the center line extending in the horizontal direction Y, the ratio of the distance D1 to the maximum length D2 in the vertical direction X, and the maximum length D2, and the back side of the curved line 4 with the center line L2 as a reference. The relationship between the length D3 of the part 4R located on the part R side and the length D4 of the part 4F located on the ventral side F side was measured, and the results are shown in Table 1.
The elongation rate of the exterior body 3 at the shortest portion 5 in FIGS. 2 and 3 was 240%, and the elongation rate of the exterior body 3 in the region indicated by reference numeral 37 was 170%.

[Examples 2 and 3]
The elastic sheet was cut into the shapes shown in FIGS. 4 (b) and 4 (c), respectively. The ratio of the distance D1 between the shortest portion and the center line extending in the horizontal direction Y, the maximum length D2 in the vertical direction X, and the distance D1 to the maximum length D2 is the same as in the first embodiment except that the values shown in Table 1 are set. Precursors for disposable diapers were made. Further, the relationship between the lengths D3 and the length D4 was measured, and the results are shown in Table 1.
In Example 2, the elongation rate of the exterior body 3 at the shortest portion 5 in FIGS. 2 and 3 was 240%, and the elongation rate of the exterior body 3 in the region indicated by reference numeral 37 was 170%.
In Example 3, the elongation rate of the exterior body 3 at the shortest portion 5 in FIGS. 2 and 3 was 240%, and the elongation rate of the exterior body 3 in the region indicated by reference numeral 37 was 170%.

[Comparative Example 1]
The elastic sheets were cut into the shapes shown in FIG. 4 (d). A disposable diaper precursor was prepared in the same manner as in Example 1. The shortest part of this precursor was on the ventral side. Measure the distance D1 between the shortest part and the center line extending in the horizontal direction Y, the maximum length D2 in the vertical direction X, the ratio of the distance D1 to the maximum length D2, and the relationship between the length D3 and the length D4. The results are shown in Table 1.

[Evaluation]
For each of the precursors of Examples 1, 2 and 3 and Comparative Example 1, both sides were joined to obtain a pants-type disposable diaper. This diaper was worn on the lower body human body model 10 as shown in FIG. When the lower body human body model 10 is to wear each diaper, first wear the diaper in the correct position, and at the opening end of the waist opening, the ventral position P4 located in the lateral center of the ventral side and the side seal portion. Mark a total of three places, including the two places. Wearing a diaper in the correct position means that the height of the ventral position P4 and the height of the dorsal position located in the lateral center of the dorsal side are aligned at the opening end of the waist opening when the diaper is worn. It is in a state of being. Next, the diaper is lowered from the worn diaper until the lower limbs of the lower body model 10 are passed through the pair of leg openings of the diaper. Prepare two strings of 150 cm or more with a clip (double clip manufactured by KOKUYO Co., Ltd.) attached to one end. Then, a string is attached to each of the ends of the pair of side seals of the diaper on the waist opening side via clips. By fixing the other ends of the two strings to the chuck of a tensile tester [Tencilon universal material tester manufactured by Orientec Co., Ltd.], pulling the strings at a pulling speed of 1000 mm / min, and pulling the diaper vertically. , Put the diaper on the lower body model 10 at once and put it on again. When re-wearing, the diaper is pulled up vertically by a tensile tester so that the force applied to the ventral and dorsal parts of the diaper is not biased. The diaper is pulled up until the position of the end portion of the side seal portion of the diaper on the waist opening side reaches the two positions of the side seal portion marked first. If the waist opening is broken or curled while being worn at once, the waist opening should be repaired and re-weared after being worn. With the above procedure, the lower body human body model 10 is made to wear a diaper. Looking straight at the model 10 wearing the diaper, the ventral position P4 in the correct wearing state first marked and the opening end located in the lateral center of the ventral side of the waist opening after re-wearing. The distance D5 from the position P5 was measured, and the result is shown in Table 1 as the amount of waist misalignment. The closer the waist position shift amount is to 0, the higher the evaluation.

As is clear from the results shown in Table 1, the diapers obtained in Examples 1 to 3 have a ventral end and dorsal at the waist opening when worn, as compared with the diapers obtained in Comparative Example 1. The position of the side part is not easily displaced from the open end, and the effect of preventing leakage of the diaper can be expected.

1A, 1B Pants-type disposable diapers (pants-type absorbent articles)
F Ventral part M Inseam R Back side 2 Absorbent body 21 Surface sheet 23 Absorbent 24 Leakage-proof cuff 25 Elastic member for forming leak-proof cuff 3 Exterior body 31 Outer layer sheet 32 Inner layer sheet 33, 34, 35 Elastic member 4 Curved line (contour line)
41 Convex part 5 Shortest part L1 Center line extending in the vertical direction L2 Center line extending in the horizontal direction X Vertical direction Y Horizontal direction

Claims (6)

It has a ventral portion arranged on the ventral side of the wearer at the time of wearing, a dorsal portion arranged on the dorsal side of the wearer, and a crotch portion located between them. It has a longitudinal direction extending to the dorsal side and a lateral direction orthogonal to the longitudinal direction, and both sides of the ventral side and both sides of the dorsal side are joined to form a pair of side seals. A pants-type absorbent article in which a portion, a waist opening and a pair of leg openings are formed.
When the absorbent article is cut open along the side seal portion and extended to the maximum extent, it is in a deployed state.
The contour line defining the leg opening has a convex shape toward the center line extending in the vertical direction of the absorbent article in the unfolded state.
The shortest portion of the lateral distance between the contour lines is located on the dorsal side of the center line extending in the lateral direction of the absorbent article in the unfolded state.
A pants-type absorbent article in which at least a part of the contour line located on the dorsal side has a convex shape toward a center line extending laterally of the absorbent article in the deployed state. The distance between the shortest portion and the center line extending in the lateral direction of the absorbent article in the unfolded state is 1% or more and 10% or less with respect to the maximum vertical length of the absorbent article in the unfolded state. , The pants-type absorbent article according to claim 1. The length of the portion of the contour line located on the ventral side of the contour line with respect to the laterally extending center line of the absorbent article in the unfolded state, rather than the length of the portion located on the dorsal side. The pants-type absorbent article according to claim 1 or 2, which has a longer length. An absorbent body having a liquid-retaining absorber and an exterior body arranged on the non-skin facing surface side of the absorbent body and defining the outer shape of the absorbent article are provided.
The exterior body is formed of a member having elasticity in the lateral direction.
The lateral elongation rate of the exterior body at the position where the shortest portion of the exterior body exists is defined as S1.
When the elongation rate of the exterior body in the region between the pair of convex contour lines of the exterior body is S2,
The pants-type absorbent article according to any one of claims 1 to 3, wherein S1 is larger than S2. An absorbent body having a liquid-retaining absorber and an exterior body arranged on the non-skin facing surface side of the absorbent body are provided.
It has a ventral portion arranged on the ventral side of the wearer at the time of wearing, a dorsal portion arranged on the dorsal side of the wearer, and a crotch portion located between them. It has a longitudinal direction extending to the dorsal side and a lateral direction orthogonal to the longitudinal direction, and both sides of the ventral side and both sides of the dorsal side are joined to form a pair of side seals. A pants-type absorbent article in which a portion, a waist opening and a pair of leg openings are formed.
The entire surface of the exterior body is formed of a member having elasticity in the lateral direction.
When the absorbent article is cut open along the side seal portion and the exterior body is opened in a relaxed state, it is in a deployed state.
The contour line defining the leg opening has a convex shape toward the center line extending in the vertical direction of the absorbent article in the unfolded state.
The shortest lateral portion of the contour lines is located on the dorsal side of the laterally extending center line of the absorbent article in the unfolded state.
A pants-type absorbent article in which at least a part of the contour line located on the dorsal side has a convex shape toward a center line extending laterally of the absorbent article in the deployed state. The exterior body defines the outer shape of the absorbent article.
The lateral elongation rate of the exterior body at the position where the shortest portion of the exterior body exists is defined as S1.
When the elongation rate of the exterior body in the region between the pair of convex contour lines of the exterior body is S2,
The pants-type absorbent article according to claim 5, wherein S1 is larger than S2.

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