Underpants-type absorbent article

Abstract

To provide an underpants-type absorbent article having an excellent leak prevention property of excretory fluid from a crotch opening.SOLUTION: An underpants-type absorbent article comprises: an absorbent body extending along a body length direction at a center in a waist circumferential direction; and a ventral part including, in an area where an exterior body and the ventral body overlap, a ventral joint area in which the exterior body and the absorbent body are joined and fixed together, and ventral non-joint areas in which the exterior body and the absorbent body are not joined. The ventral joint area includes a ventral central narrow joint area, and a ventral upper wide joint area and a ventral wide lower joint area that are placed above and below the body length direction of the ventral central narrow joint area and have wider widths in the waist circumference direction than that of the ventral central narrow joint area. The ventral non-joint areas are disposed outward on left / right sides of the ventral central narrow joint area in the direction around the waist. The absorbent body includes, on both sides thereof, side edge elastic bodies stretchably arranged along the body length direction, and the side edge elastic bodies extend to the ventral non-joint areas.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to pants-type absorbent articles such as diapers.

Background Art

[0002] Absorbent articles such as diapers are available in forms such as tape type and pants type. In the case of pants-type absorbent articles, an absorber is stretched across the ventral side and the dorsal side to form the crotch portion, and the outer bodies on the ventral side and the dorsal side are joined by left and right waist joints at the ends in the width direction to form the torso circumference portion and the leg openings. In order to prevent leakage from the side portion of the crotch portion, a technique of raising the member on the side portion of the absorber to form a leakage-preventing dam is known (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For pants-type absorbent articles as described above, high fit is required from the viewpoint of preventing leakage. However, due to the structure of the human body, when the wearer sits or bends, the lower side of the lower abdomen protrudes more than when standing upright, and a depression can form near the base of the legs. In this case, a gap is created between the pants-type absorbent article from the wearer's lower abdomen to around the feet, and depending on the amount of excretion, it may lead to leakage of excreted liquid from the groin opening. The present invention relates to providing a pants-type absorbent article excellent in preventing leakage of excreted liquid from the groin opening in view of the above points.

Means for Solving the Problems

[0005] The present invention relates to a pant-type absorbent article comprising an absorbent body and an outer casing disposed on the non-skin side of the absorbent body, and further comprising an abdominal portion disposed on the abdominal side of the wearer, a crotch portion disposed on the groin side, and a back portion disposed on the back side, and having a waist circumference direction and a body length direction, The absorbent body extends along the length direction from the center in the waist direction, The ventral portion has a ventral joining region where the outer casing and the absorbent body are joined and fixed in the region where the outer casing and the absorbent body overlap, and a ventral non-joint region where the outer casing and the absorbent body are not joined, the ventral joining region includes a ventral central narrow joining region, and a ventral upper wide joining region and a ventral lower wide joining region, which are located above and below the ventral central narrow joining region in the body length direction and are wider in the waist direction than the ventral central narrow joining region, the ventral non-joint region is located to the left and right outward in the waist direction of the ventral central narrow joining region, The absorbent body has elastic side edge bodies on both sides that are stretchable along the length direction, and these elastic side edge bodies extend to the ventral non-jointed region. We provide absorbent articles in the form of panties. [Effects of the Invention]

[0006] The absorbent pant-type article of the present invention is excellent at preventing leakage of excretory fluid from the crotch area. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic perspective view showing a pant-type diaper as a preferred embodiment of the pant-type absorbent article according to the present invention. [Figure 2] Figure 1 is a schematic, partially cut-out unfolded plan view showing a pant-type diaper as viewed from the skin side, after it has been cut at the waist joint, unfolded, and stretched. [Figure 3] Figure 2 shows a cross-sectional view of a pull-up diaper along line III-III. [Figure 4]This is a schematic cross-sectional view showing the change in the state of a pant-type diaper from the state shown in Figure 3 when the wearer sits down and bends their legs, compared to the state before the wearer sits down. [Figure 5] This perspective view schematically shows the deformation of the bent portion of the absorbent body in the ventral non-jointed region due to the contraction of the lateral edge elastic material. [Figure 6] This is a plan view showing an example of the arrangement of the high-basis-weight and low-basis-weight portions of the absorbent material contained within the absorbent body. [Figure 7] This is a cross-sectional view showing an example of the arrangement of the lateral extension elastic material in the absorbent body. [Modes for carrying out the invention]

[0008] A preferred embodiment of the absorbent pant-type article of the present invention will be described below with reference to the drawings. In this specification, the side that comes into contact with the wearer's skin is referred to as the skin side or inner side, and the opposite side is referred to as the non-skin side or outer side. These terms are also used to indicate the relative positional relationship in the component structure of an absorbent article, even for components that do not have a surface that comes into contact with the wearer's skin. Furthermore, the direction that is located in front of the wearer when worn is referred to as the front or front side, and the direction that is located behind is referred to as the rear or rear side. The direction normal to the surface or back surface of an absorbent article, that is, the direction in which the components are stacked, is referred to as the thickness direction.

[0009] As shown in Figure 1, the pant-type diaper 10 of this embodiment (hereinafter also referred to as diaper 10) comprises an abdominal portion 10F located on the wearer's abdominal side, a crotch portion 10C located on the groin side, and a back portion 10R located on the back side, and has a waist circumference direction X and a body length direction Y. Furthermore, the diaper 10 comprises a waist opening 12 located above the abdominal portion 10F and the back portion 10R in the body length direction Y, and a pair of leg openings 13, 13 located on the left and right sides of the crotch portion 10C.

[0010] The diaper 10 has an absorbent body 1 and an outer casing 2 positioned on the non-skin side of the absorbent body 1 as its constituent components. The outer casing 2 has portions 21 and 22 positioned on the ventral side 10F and the dorsal side 10R. The outer casings 21 and 22 on the ventral side 10F and the dorsal side 10R are joined at their ends in the waist direction X by a pair of waist joints 11, 11. In other words, the portion of the outer casing 1 sandwiched between the left and right pair of waist joints 11, 11 becomes the outer casings 21 and 22 on the ventral side 10F and the dorsal side 10R. Joining at the waist joints 11 can be carried out by various methods used for this type of article. For example, there are joining methods that involve compaction and integration, such as fusion bonding (e.g., heat sealing, ultrasonic sealing, laser melting) and compression bonding (e.g., embossing).

[0011] In the diaper 10 of this embodiment, the outer casing 2 is divided into a ventral outer casing 21 and a dorsal outer casing 22, which form the outer surface of the ventral portion 10F and the dorsal portion 10R, respectively. The outer casing 1 is not limited to this divided form and can take any form that is normally possible for this type of article. For example, the outer casing 1 may extend over the crotch area 10F, the crotch area 10C and the dorsal portion 10R, and have a shape that is narrowed inward in the width direction at the crotch area 10C. Hereinafter, the outer coverings 21 and 22 of the ventral portion 10F and dorsal portion 10R of the diaper 10 will be described as the ventral outer covering 21 and dorsal outer covering 22 of the aforementioned divided form.

[0012] In the diaper 10 of this embodiment, an annular waist portion 10D consisting of an abdominal outer casing 21 and a dorsal outer casing 22 is formed by joining at the waist joint portion 11. The absorbent body 1 extending from the waist portion 10D forms the crotch area 10C. Furthermore, a crotch extension portion 8 extending from the dorsal outer casing 22 is positioned on the crotch area 10C side of the waist joint portion 11. The crotch extension portion 8 covers a part of the non-skin side of the absorbent body 1 in the crotch area 10C and forms a part of the outer surface body on the buttock side of the crotch area 10C.

[0013] Figure 2 shows the diaper 10 in its unfolded state after being cut at the waist joints 11, 11. Here, the unfolded state refers to the state in which each part is stretched out and the pant-type absorbent item is spread out in a flat shape. In the unfolded state, the waist circumference direction X and the body length direction Y mentioned above are also called the width direction X and the longitudinal direction Y. In the unfolded state of the diaper 10, the ventral outer casing 21 and the dorsal outer casing 22 have a horizontally elongated shape in the waist direction X. The absorbent body 1 has a vertically elongated shape, extending along the body length direction Y from the center of the waist direction X, and is positioned toward the ventral part 10F, the crotch area 10C, and the dorsal part 10R of the diaper 10. The absorbent body 1 has a liquid-permeable surface sheet 14 on the skin side, a leak-proof back sheet 15 on the non-skin side, and a liquid-retaining absorbent body 16 positioned between the surface sheet 14 and the back sheet 15. Furthermore, the absorbent body 1 is provided with a pair of side sheets 17 on both sides in the longitudinal direction Y of the absorbent body 1. The absorbent body 1 is joined and fixed to the skin-facing sides of at least the ventral outer casing 21 and the dorsal outer casing 22. Furthermore, the skin-facing end of the absorbent body 1 in the longitudinal direction Y is covered by the folded-over portions 23 of the ventral outer casing 21 and the dorsal outer casing 22, which are positioned on the non-skin-facing side. These joining and fixing can be achieved by various means commonly used in this type of article. For example, joining and fixing can be done by applying various adhesives, such as hot-melt adhesives (the same applies to the joining and fixing methods described below).

[0014] The ventral outer body 21 that forms the outer surface body of the ventral part 10F has an outer layer sheet 61 and an inner layer sheet 62, and has a laminated structure in which a waist elastic body (hereinafter also simply referred to as an elastic body) 7 is disposed between these sheets. Similarly, the dorsal outer body 22 that forms the outer surface body of the dorsal part 10R has an outer layer sheet 63 and an inner layer sheet 64, and has a laminated structure in which a waist elastic body 7 is disposed between these sheets. The waist elastic body 7 is joined in an extended state along the waist circumferential direction X and is arranged to be stretchable along the waist circumferential direction. A plurality of such waist elastic bodies 7 are arranged at intervals along the body length direction Y. More specifically, the elastic bodies 7 disposed in the ventral outer body 21 and the dorsal outer body 22 extend in the waist circumferential direction X while both ends thereof are joined and fixed to the left and right waist joints 11, 11, and are sandwiched and joined and fixed between the outer layer sheet 61 and the inner layer sheet 62 and between the outer layer sheet 63 and the inner layer sheet 64. In the region 10G where the ventral outer body 21 and the absorbent body 1 overlap and the region 10H where the dorsal outer body 22 and the absorbent body 1 overlap, the elastic body 7 is partially divided in the laminated portion of the ventral outer body 21 and the absorber 16 and in the laminated portion of the dorsal outer body 22 and the absorber 16. The end portions of each divided elastic body 7 are joined at the ventral outer body 21 at a position overlapping the absorbent body 1 and at the dorsal outer body 22 at a position overlapping the absorbent body 1, and are made stretchable between the other end portions joined to the waist joint 11. The joining and fixing position of the elastic body 7 on the inner side (position overlapping the absorbent body 1) in the waist circumferential direction X is not particularly limited, but it is preferably varied according to the ventral upper wide joining region 51, the ventral central narrow joining region 52, and the ventral lower wide joining region 53 described later. For example, the joining and fixing position of the elastic body 7 on the inner side in the waist circumferential direction X is preferably set at a position overlapping each of the ventral upper wide joining region 51 and the ventral lower wide joining region 53, and at the left and right outer positions in the waist circumferential direction X of the ventral central narrow joining region 52. The joining and fixing position of the elastic body 7 in the dorsal outer body 22 is also preferably the same as above.

[0015] The elastic body 7 and the absorber 16 do not necessarily overlap, but it is preferable that they partially overlap. When the end of the absorber 16 is partially contracted by the elastic body 7, the absorber 16 becomes more likely to follow the body curvature. The overlapping width of the elastic body 7 and the absorber 16 is preferably 10% - 50% of the absorber width, more preferably 20% - 40% of the absorber width.

[0016] Next, the ventral exterior body 21 and the absorbent main body 1 in the ventral part 10F will be further described. In a plan view of the ventral exterior body 21, in a region 10G where the ventral exterior body 21 and the absorbent main body 1 overlap, there are a ventral joint region 5 where the ventral exterior body 21 and the absorbent main body 1 are joined and fixed, and a ventral non - joint region 41 where the ventral exterior body 21 and the absorbent main body 1 are not joined and fixed. The ventral joint region 5 is a part where the inner layer sheet 62 of the ventral exterior body 21 and the back sheet 15 of the absorbent main body 1 are joined and fixed in the thickness direction, and the ventral exterior body 21 and the absorbent main body 1 are integrated.

[0017] The ventral joint region 5 includes three types of regions with different lengths in the waist - around direction X. Specifically, the ventral joint region 5 includes a ventral central narrow - width joint region 52, and a ventral upper - wide joint region 51 and a ventral lower - wide joint region 53 that are arranged above and below the ventral central narrow - width joint region 52 in the body - length direction Y and have a wider width in the waist - around direction X than the ventral central narrow - width joint region 52. These joint regions are adjacent to each other and can be distinguished based on the difference in the width in the waist - around direction X.

[0018] The ventral non - joint region 41 is arranged on the left and right outer sides in the waist - around direction X of the ventral central narrow - width joint region 52.

[0019] In the diaper 10, the area 10G where the ventral outer casing 21 and the absorbent body 1 overlap corresponds to the area in the body length direction Y that covers from around the wearer's navel to above the excretion point (groin). Within this area, the ventral upper wide joining area 51 is positioned opposite to the wearer's navel. The ventral central narrow joining area 52 is positioned opposite to the area extending from the lower part of the wearer's lower abdomen (below the level of the ilium) to the part where the inguinal region extends. The ventral lower wide joining area 53 is positioned opposite to the wearer's thighs.

[0020] It is preferable that the length H2 in the height direction Y of the ventral central narrow joint region 52 is longer than the lengths H1 and H3 in the height direction Y of the ventral upper wide joint region 51 and the ventral lower wide joint region 53, respectively. In the above relationship, the ratio (H2 / (H1+H3)) of the length H2 in the body length direction Y of the ventral central narrow joining region 52 to the sum of the lengths H1 and H3 in the body length direction Y of the ventral upper wide joining region 51 and the ventral lower wide joining region 53 is preferably 0.6 or more, more preferably 0.8 or more, and even more preferably 1 or more, from the viewpoint of making it easier for the absorbent body 16 or absorbent main body 1 to stand up toward the skin. Furthermore, the ratio (H2 / (H1+H3)) is preferably 3 or less, more preferably 2.5 or less, and even more preferably 2 or less, from the viewpoint of maintaining adhesion between the absorbent main body 1 and the ventral outer casing 21.

[0021] The ventral upper wide joining region 51 is preferably in the range of 0% to 60% and more preferably in the range of 30% to 50% when the end on the waist opening 12 side in the length direction Y is defined as 0% and the end on the crotch side is defined as 100% in the region 10G where the ventral outer casing 21 and the absorbent main body 1 overlap, respectively. The central wide bonding region 52 is preferably in the range of 30% to 90% and more preferably in the range of 40% to 80% in the region 10G where the ventral outer casing 21 and the absorbent main body 1 overlap, with the end on the waist opening 12 side in the length direction Y being 0% and the end on the crotch side being 100%. The ventral lower wide joining region 53 is preferably in the range of 60% to 100% and more preferably in the range of 75% to 95% in the region 10G where the ventral outer casing 21 and the absorbent main body 1 overlap, with the end on the waist opening 12 side in the length direction Y being 0% and the end on the crotch side being 100%.

[0022] The width W2 in the waist circumference direction X of the ventral central narrow joining region 52 is smaller than the widths W1 and W3 of the ventral upper wide joining region 51 and the ventral lower wide joining region 53. As a result, in the ventral non-jointed region 41 outside the waist circumference direction X of the ventral central narrow joining region 52, the absorbent body 1 can become a bent portion 1K that faces the skin surface along the body length direction Y (Figure 4). For example, when the wearer (e.g., an infant) sits down and bends their legs, as the lower abdomen and legs move closer together, the ventral upper wide joining region 51 and the ventral lower wide joining region 53 are drawn together at the position of the ventral non-joint region 41, and the distance between them decreases (for example, arrow F1 shown in Figure 4). As a result, the absorbent body 1 that is not joined to the ventral outer casing 21 bends convexly toward the skin surface, forming the aforementioned bent portion 1K (for example, changing from the state in Figure 3 to the state in Figure 4). In response to this bending, the ventral upper wide joining region 51 and the ventral lower wide joining region 53 suppress deformation at the position on either side of the bent portion 1K and firmly contact the wearer's skin surface, allowing the aforementioned bending to occur stably. As a result, the absorbent body 1 in the ventral non-joint region 41 can penetrate from the lower abdomen of the wearer (below the level of the ilium) to the groin area, near the base of the legs.

[0023] From the viewpoint of the above, the width W2 of the ventral central narrow bonding region 52 is preferably 90% or less of the width W1 of the ventral upper wide bonding region 51 and the width W3 of the ventral lower wide bonding region 53, more preferably 60% or less, and even more preferably 50% or less. Furthermore, from the viewpoint of improving the adhesion between the ventral outer casing 21 and the absorbable body 1, the width W2 is preferably 10% or more of the width W1 and the width W3, more preferably 15% or more, and even more preferably 20% or more.

[0024] The widths W1 and W3 of the ventral upper wide joining region 51 and the ventral lower wide joining region 53 in the waist direction X may be the same or different. From the viewpoint of making the absorbent material 16 or absorbent body 1 easier to bend and making the side portion of the absorbent material easier to stand up, it is preferable that they be the same. The widths W1 and W3 of the ventral upper wide joining region 51 and the ventral lower wide joining region 53 in the waist circumference direction X may be the same as the width of the absorbent body 1 in the waist circumference direction X, or they may be shorter. From the viewpoint of making it easier to widen the waist circumference, it is preferable to make them shorter than the width of the absorbent body.

[0025] The ventral central narrow joint region 52 is preferably located in the central part of the waist circumference X direction of the ventral outer casing 21. The width W2 of the ventral central narrow joint region 52 in the waist direction X is preferably 30% or less, more preferably 25% or less, and even more preferably 20% or less, of the width W4 of the ventral outer casing 21 in the waist direction X, from the viewpoint of suppressing the bending of the absorbent body 1 around the lower abdomen where the wearer's body is less likely to bend. Furthermore, the width W2 is preferably 10% or more, and more preferably 15% or more, from the viewpoint of improving the adhesion between the ventral outer casing 21 and the absorbent body 1. With this configuration, the area on the outer side in the width direction of the ventral central narrow joint region 52 can sufficiently correspond to and bend to the length of the curvature that occurs in the lower abdomen when the wearer sits down, etc., and the linear depression that occurs from the hip joint toward the center of the front of the body (mainly a depression along the groin).

[0026] The range of each of the above bonding regions can be measured as follows. First, the absorbent pants to be measured are cut at the waist joint 11 and unfolded, and stretched sufficiently without tearing. Printing toner is applied to the non-skin side of the absorbent pants and adhered to the adhesive applied to the absorbent pants. After removing the unadhered toner, the outline of the joint raised by the toner is read with a scanner, and the dimensions in the waist circumference direction X and body length direction Y are calculated using area calculation software. For example, Image-pro 10 (product name) from Media Cybernetics can be used as area calculation software.

[0027] Furthermore, in the diaper 10, the absorbent body 1 has side edge elastic bodies 18 on both sides in the body length direction Y. The side edge elastic bodies 18 are joined in an extended state along the body length direction Y and are arranged to be expandable and contractible along the body length direction Y. These side edge elastic bodies 18 extend to the ventral non-joined region 41. More specifically, both ends of the side edge elastic bodies 18 are joined and fixed to other components of the absorbent body 1 at joining and fixing parts 181 in the ventral part 10F and the dorsal part 10R. Between these ends, the side edge elastic bodies 18 are made expandable and contractible. The contraction force along the body length direction Y caused by these side edge elastic bodies 18 lifts both left and right sides 1A, 1A of the absorbent body 1 in the body length direction Y, causing them to curve inward in the waist circumference direction X. As a result, both sides 1A, 1A of the absorbent body 1 stand up toward the wearer's skin and wrap around the wearer's skin.

[0028] As described above, the elastic side edge members 18 that perform this function extend to the ventral non-jointed region 41 with the ventral outer casing 21 in the ventral portion 10F. As a result, the contractile force of the absorbent body 1 along the length direction Y extends to the portion of the absorbent body 1 in the ventral non-jointed region 41 that is not joined to the ventral outer casing 21. Therefore, when the diaper 10 is worn, both sides 1A, 1A of the absorbent body 1 can rise up from the joint fixing portion 181 in the ventral non-jointed region 41. Furthermore, the rising of both sides 1A at the joint fixing portion 181 is more likely to occur in conjunction with the rising of both sides 1A, 1A that mainly occurs in the crotch area 10C. The effect of the elastic material 18 on the side edge is enhanced by the upward movement of the absorbent body 1 towards the skin surface, starting from the bent portion 1K in the ventral non-jointed region 41. As a result, both sides 1A, 1A of the absorbent body 1, where the elastic material 18 is located, extending from the crotch area 10C to the ventral area 10F, come into contact with the wearer's skin surface like an outer wall against the bent portion 1K (for example, arrow F2 shown in Figure 5). In this way, the absorbent body 1 wraps around the wearer's lower abdomen, groin, and even the crotch. Furthermore, the effect of the elastic material 18 on the side edge can improve the fit of the aforementioned bent portion 1K near the wearer's groin. The synergistic effect of the elastic material 18 on the side edge and the ventral non-jointed region 41 enhances the ability of the diaper 10 to prevent leakage from the crotch.

[0029] The lateral edge elastic body 18 may extend to a portion of the total length H2 in the height direction Y of the ventral non-jointed region 41, or it may extend over the entire length H2, as long as it extends over the ventral non-jointed region 41. From the viewpoint of making the above effect more reliable, it is preferable that the lateral edge elastic body 18 extends over the entire length H2 in the height direction Y of the ventral non-jointed region 41. Furthermore, it is preferable that the ventral non-jointed region 41 includes a portion of the lateral edge elastic body 18 that is not fixed to the joint fixing portion 181.

[0030] Preferably, the absorbent material 16 is included in both sides 1A, 1A of the absorbent body 1, which rises up due to the action of the elastic material 18 at the side edge. From the above viewpoint, it is preferable that the absorbent body 16 comprises a high-basis-weight section 161 with a different basis weight and a low-basis-weight section 162 with a lower basis weight, as shown in Figure 6, and that the low-basis-weight section 162 and the side-edge elastic body 18 are positioned adjacent to each other in the direction of the waist. This makes it easier for the absorbent body 1 to bend around the low-basis-weight section 162 and stand up towards the skin side. Note that in Figure 6, other components are partially omitted in order to understand the arrangement relationship of the high-basis-weight section 161, the low-basis-weight section 162 and the side-edge elastic body 18. In order to ensure that the low basis weight section 162 is adjacent to the side edge elastic body 18, it is preferable that the high basis weight section 161 and the low basis weight section 162, which have different basis weights, be arranged as follows. Specifically, as shown in Figure 6, it is preferable that the high basis weight section 161 extends along the body length direction Y at the center of the width X in the waist direction of the absorber 16, and that the low basis weight sections 162 extend along the body length direction Y on both sides thereof. Furthermore, the widths of the high-basis-weight section 161 and the low-basis-weight section 162 in the waist circumference direction X may or may not be uniform along the length direction Y. From the viewpoint of improving both the leak-proof properties due to the rising of both sides 1A, 1A of the absorbent body 1 toward the skin side and the absorption of excretory fluids by the absorbent material 16, it is preferable that the widths of the waist circumference direction X are not uniform, as shown in Figure 6. That is, it is preferable to improve the absorbency of the high-basis-weight section 161 so that the width in the waist circumference direction X at the abdominal side 10F is wider than the width at the crotch area 10C. Correspondingly, the width of the low-basis-weight section 162 in the waist circumference direction X is narrower at the abdominal side 10F than at the crotch area 10C.

[0031] From the viewpoint of enhancing the leak-proof properties due to the rising edges of both sides 1A, 1A of the absorbent body 1, the ratio (W62 / W61) of the width W62 in the waist circumference direction X of each of the left and right pairs of low basis weight portions 162 in the ventral non-joint region 41 to the width W61 of the high basis weight portion 161 in the waist circumference direction X is preferably 5% or more, more preferably 10% or more, and even more preferably 20% or more. Furthermore, from the viewpoint of enhancing the absorbency of the absorbent material 16, the ratio (W62 / W61) in the ventral non-joint region 41 is preferably 50% or less, more preferably 40% or less, and even more preferably 30% or less.

[0032] The high-basis-weight portion 161 and the low-basis-weight portion 162 in the absorber 16 may be formed by varying the thickness of a single layer, or by varying the number of layers. In the examples shown in Figures 2 and 6, there is a laminated structure of an upper absorbent portion 16A and a lower absorbent portion 16B, where the upper and lower two-layer laminated portion is the high-basis-weight portion 161, and the single-layer portion consisting only of the lower absorbent portion 16B is the low-basis-weight portion 162, which has a lower basis weight than the high-basis-weight portion 161.

[0033] From the viewpoint of improving leak prevention, the basis weight of the absorbent material in the high basis weight section 161 is preferably 1.1 times or more, more preferably 1.5 times or more, and even more preferably 2.0 times or more. Furthermore, from the viewpoint of improving the flexibility of the absorbent body 16 or the absorbent main body 1, the basis weight of the absorbent material in the high basis weight section 161 is preferably 5.0 times or less, more preferably 4.0 times or less, and even more preferably 3.5 times or less, the basis weight of the absorbent material in the low basis weight section 162.

[0034] Furthermore, from the viewpoint of including the absorbent material 16 in both sides 1A, 1A of the absorbent body 1 that rise up, it is preferable that, as shown in Figure 6, the absorbent material 16 has a pair of upright base portions 19, 19 arranged along the length direction Y, which occur when both sides 1A, 1A of the absorbent body 1 rise up due to the contraction of the side edge elastic body 18. It is preferable that the upright base portions 19 extend to the ventral non-jointed region 41. These upright base portions 19 function as so-called fold lines when both sides 1A, 1A of the absorbent body 1 rise up toward the skin side. The upright base portion 19, like the lateral edge elastic body 18, may extend to a portion of the total length H2 in the height direction Y of the ventral non-jointed region 41, or it may extend over the entire total length H2. From the viewpoint of making the above effect more reliable, it is preferable that the lateral edge elastic body 18 extends over the entire total length H2 in the height direction Y of the ventral non-jointed region 41.

[0035] The upright base portion 19 can have various structures that allow it to stand upright within the absorbent body 1. In particular, the upright base portion 19 preferably includes a slit portion formed in the absorbent body 16. Furthermore, the upright base portion 19 preferably includes the boundary portion between the high basis weight region 161 and the low basis weight region 162 of the absorbent body 16. In these areas, the absorbent body 16 is easily bent, allowing both sides 1A, 1A of the absorbent body 1 to stand up smoothly. In Figure 6, the upright base portion 19 is shown as including a boundary portion extending in the height direction Y between the high basis weight region 161 and the low basis weight region 162. Here, the slit portion refers to a groove portion formed in the absorbent body 16, and means a region where the basis weight of the absorbent material forming the absorbent body 16 is close to zero. That is, the basis weight in the slit is smaller than the basis weight in the low basis weight region.

[0036] Preferably, the distance W5 between the left and right pair of upright base portions 19, 19 in the waist circumference direction X in the ventral non-jointed region 41 is greater than the width W2 in the waist circumference direction X of the ventral central narrow jointed region 52. This allows for a larger rise width of both sides 1A, 1A of the absorbent body 1 and a wider width of the bent portion 1K in the ventral non-jointed region 41, thereby improving the leak-proof properties of the diaper 10. If the upright base portions 19 have width in the waist circumference direction, the distance W5 is the distance between the inner side edges of the upright base portions 19 in the waist circumference direction X. If the upright base portions 19 are not straight along the body length direction Y, W5 is the width between the upright base portions 19 and the ventral central narrow jointed region 52 at the position where the distance between the left and right upright base portions 19 is narrowest, and this W5 satisfies the above relationship.

[0037] From the viewpoint of improving the fit of the crotch area 10C, the distance W5 between the standing base portions 19, 19 is preferably 1.1 times or more, more preferably 1.2 times or more, and even more preferably 1.3 times or more, the width W2 in the waist circumference direction X of the ventral central narrow joint area. Furthermore, from the viewpoint of improving the leak-proofness of the absorbent side portion, the distance W5 is preferably 2 times or less of W2, more preferably 1.8 times or less, and even more preferably 1.6 times or less.

[0038] The side edge elastic body 18 can take on various configurations as it acts to lift both sides 1A, 1A of the absorbent body 1 in the length direction Y. For example, the side edge elastic body 18 may be an elastic body that forms leg gathers so that the absorbent body 1 fits around the wearer's legs, or it may be an elastic body that forms three-dimensional gathers that come into contact with the wearer's skin further inward. Alternatively, the side edge elastic body 18 may be an elastic body that directly lifts the absorbent material 1 inside the absorbent body 1.

[0039] In the examples shown in Figures 2 and 6, the side edge elastic body 18 represents an elastic body that forms the leg gather. The side edge elastic body 18 is sandwiched between the aforementioned side sheet 17 and back sheet 15, and is positioned in an extended state along the longitudinal direction Y. Joining and fixing parts 181 for connection with other components of the absorbent body 1 are provided at both ends of the side edge elastic body 18 in the length direction Y, and these ends serve as the base points for expansion and contraction.

[0040] If the side edge elastic body 18 is an elastic body that forms a three-dimensional gather, the side edge elastic body 18 is sandwiched between the folded portion on the inner side in the waist circumference direction X of the side sheet 17 and joined and fixed in the same manner as in the case of leg gathers.

[0041] If the side edge elastic body 18 is an elastic body that directly raises the absorbent body 1 inside the absorbent body 1, then, for example, a configuration like the one shown in Figure 7 can be used. The cross-sectional view shown in Figure 7 is a cross-sectional view of the absorbent body 1 along the waist circumference direction X near the center of the body length direction Y. As shown in Figure 7, the absorbent body 1 has a surface sheet 14 on the skin-facing side of the absorbent body 16 and a back sheet 15 on the non-skin-facing side of the absorbent body, as described above. The surface sheet 14 extends in the waist direction X from the skin-facing side of the absorbent body 16 to the side edge and then to the non-skin-facing side. A fixing portion 151 is located at the non-skin-facing side of the upright base portion 19 of the absorbent body 16, to which the surface sheet 14 and the back sheet 15 are joined. This provides a bag-like portion 14A of the surface sheet 14 that covers the absorbent body 16 from the side edge to the upright base portion 19. In addition, a side edge elastic body 18 is positioned on the side edge of the absorbent body 16 and enclosed within the bag-like portion 14A of the surface sheet 14. With this configuration, the absorbent body 16 can be directly raised, further enhancing the aforementioned leak-proof properties of the diaper 10. In this case, the upright base portion 19 may be a slit extending in the height direction Y in the absorber 16, or it may be the boundary between the high basis weight region 161 and the low basis weight region 162. In the example shown in Figure 7, the upright base portion 19 is a slit formed in the absorber that extends in the height direction Y, and in this cross-section, the absorber 16 is divided into a central absorbent portion 16M and lateral absorbent portions 16N, 16N located on its left and right sides.

[0042] In the configuration shown in Figure 7, it is preferable that the width W2 of the ventral central narrow joining region 52 in the waist direction X is the same as or narrower than the distance W6 between the fixing parts 151, 151 in the waist direction X. In this way, the rising of both sides 1A, 1A of the absorbent body 1 is not obstructed by the ventral central narrow joining region 52, and the aforementioned leak-proof performance of the diaper 10 is more reliably enhanced. Here, if the fixing part 151 has a width in the waist direction X, the distance between the inner edges of the fixing part 151 in the waist direction X is defined as W6. The width W2 of the ventral central narrow joining region 52 in the waist direction X is preferably 60% or more, more preferably 70% or more, and even more preferably 75% or more of the distance W6 between the fixing parts 151, from the viewpoint of improving adhesion between the ventral outer casing 21 and the absorbent body 1. Furthermore, the width W2 of the ventral central narrow joining region 52 in the waist direction X is preferably 100% or less, more preferably 90% or less, and even more preferably 85% or less of the distance W6 between the fixing parts 151, from the viewpoint of improving the rise of the absorbent body 16 or the absorbent body 1.

[0043] Furthermore, it is preferable that the absorbent body 1 has a high basis weight area 161 of the absorbent material 16 in the position overlapping with the ventral central narrow joining area 52. By having the ventral central narrow joining area 52 overlap with the high basis weight area 161, the ventral central narrow joining area 52 becomes less prone to bending, improving the fit to the body. At the same time, in the ventral non-jointed area 41 adjacent thereto, the upward movement of both sides 1A, 1A of the absorbent body 1, the curvature in the waist direction X, and the bending of the bent portion 1K of the absorbent body 1 along the body length direction Y can be made more clearly defined.

[0044] Preferably, the average basis weight of the absorbent material 16 positioned in a location overlapping with the ventral non-jointed region 41 is lower than the average basis weight of the absorbent material 16 positioned in a location overlapping with the ventral central narrow jointed region 52. Typically, it is preferable that the absorbent material 16 positioned in a location overlapping with the ventral central narrow jointed region 52 is composed of a high basis weight portion 161, and the absorbent material 16 positioned in a location overlapping with the ventral non-jointed region 41 includes a low basis weight portion 162. By doing so, the ventral non-jointed region 41 becomes more likely to rise and curve inward, further enhancing the aforementioned leak-proof properties of the diaper 10. From the viewpoint of improving leak prevention, the average basis weight of the absorbent material 16 positioned in a location overlapping with the ventral non-jointed region 41 is preferably 10% or more, more preferably 20% or more, and even more preferably 30% or more, of the average basis weight of the absorbent material 16 positioned in a location overlapping with the ventral central narrow jointed region 52. Furthermore, from the viewpoint of improving the ease of bending of the absorbent material 16 or the absorbent body 1, the average basis weight of the absorbent material 16 positioned in a location overlapping with the ventral central narrow jointed region 52 is preferably 95% or less, more preferably 90% or less, and even more preferably 85% or less.

[0045] (Method for measuring average basis weight) The absorbent material at the location overlapping the ventral central narrow bonding region 52 and the ventral non-bonding region 41 is cut out to a size of 3 cm x 3 cm. The mass of each piece is measured, and the average basis weight is calculated by dividing the mass by the area. The average basis weight value for each piece is calculated as the average of 5 measurements.

[0046] Next, the dorsal outer casing 22 and the absorbent body 1 in the dorsal portion 10R of the diaper 10 will be described.

[0047] The dorsal outer casing 22, like the ventral outer casing 21, has a dorsal bonding region 3 in the region 10H where the dorsal outer casing 22 and the absorbent body 1 overlap, and a dorsal non-bonding region 42 where the dorsal outer casing 22 and the absorbent body 1 are not bonded or fixed. The dorsal bonding region 3 is the part in the thickness direction where the inner layer sheet 64 of the dorsal outer casing 22 and the back surface sheet 15 of the absorbent body 1 are bonded and fixed, so that the dorsal outer casing 22 and the absorbent body 1 are integrated.

[0048] In the dorsal bonding region 3, the bonding area between the dorsal outer casing 22 and the absorbent body 1 is preferably configured to include three regions with different lengths in the waist circumference direction X, as shown in Figure 2. Specifically, the dorsal bonding region 3 includes a dorsal central narrow bonding region 32, and a dorsal ventral upper wide bonding region 31 and a dorsal lower wide bonding region 33, which are located above and below the dorsal central narrow bonding region 32 in the body length direction Y, and have a wider width in the waist circumference direction X than the dorsal central narrow bonding region 32. These bonding regions are adjacent to each other and can be distinguished based on the difference in width in the waist circumference direction X. In the example shown in Figure 2, the dorsal central narrow bonding region 32 has a stepped or T-shaped planar shape with two stages of width in the waist circumference direction X. This allows the dorsal portion 10R to fit the body shape from the buttocks to the waist and from the waist to the abdomen.

[0049] The dorsal non-jointed region 42 is located to the left and right outward in the waist direction X of the dorsal central narrow jointed region 32.

[0050] In the diaper 10, the overlapping region 10H between the dorsal outer casing 22 and the absorbent body 1 corresponds to the area covering the skin surface in the body length direction Y from the height of the lumbar vertebrae to the area above the height of the coccyx on the wearer's back. Within this region, the dorsal upper wide joint region 31 is positioned opposite the lumbar vertebrae on the wearer's back. The dorsal central narrow joint region 32 is positioned opposite the area from the lower end of the lumbar vertebrae to the upper part of the buttocks (at the height of the sacrum). The dorsal lower wide joint region 33 is positioned opposite the area above the height of the wearer's coccyx. This allows the absorbent material 16 to bend when, for example, the wearer is being held or sitting down, causing the absorbent material 16 to be pushed up. The absorbent material 16 can then bend to act as a leak barrier against feces. Additionally, the bending of the absorbent material 16 or absorbent body 1 causes the sides of the absorbent material to stand up, preventing feces from leaking from the crotch area.

[0051] It is preferable that the length H6 in the height direction Y of the narrow central joint region 32 on the back is longer than the lengths H5 and H7 in the height direction Y of the upper wide joint region 31 and the lower wide joint region 33 on the back, respectively. In the above relationship, the ratio (H6 / (H5+H7)) of the length H6 in the body height direction Y of the narrow central joint region 32 on the back to the sum of the lengths H5 and H7 in the body height direction Y of the upper wide joint region 31 and the lower wide joint region 33 on the back is preferably 0.6 or more, more preferably 0.8 or more, and even more preferably 1 or more, from the viewpoint of making the absorbent body 16 or absorbent main body 1, which is sometimes bent when being held, more likely to become leak-proof. Furthermore, the ratio (H6 / (H5+H7)) is preferably 4 or less, more preferably 3.5 or less, and even more preferably 3 or less, from the viewpoint of improving the adhesion between the absorbent main body 1 and the back outer casing 22.

[0052] The wide upper dorsal joint region 31 is preferably in the range of 0% to 50% and more preferably in the range of 20% to 40% or more, when the end on the waist opening 12 side in the length direction Y is defined as 0% and the end on the crotch side is defined as 100% in the region 10H where the dorsal outer casing 22 and the absorbent main body 1 overlap, respectively. The wide central joint area 32 on the back side is preferably in the range of 20% to 90% and more preferably in the range of 30% to 85% in the area 10H where the back outer casing 22 and the absorbent main body 1 overlap, with the end on the waist opening 12 side in the length direction Y being 0% and the end on the crotch side being 100%. The wide lower dorsal joint region 33 is preferably in the range of 70% to 100%, and more preferably in the range of 80% to 95%, when the end on the waist opening 12 side in the length direction Y is set to 0% and the end on the crotch side is set to 100% in the region 10H where the dorsal outer casing 22 and the absorbent main body 1 overlap, respectively.

[0053] The width W8 in the waist circumference direction X of the narrow central dorsal joint region 32 is smaller than the widths W7 and W9 of the upper wide dorsal joint region 31 and the lower wide dorsal joint region 33. As a result, similar to the ventral portion 10F, in the dorsal non-jointed region 42 outside the waist circumference direction X of the narrow central dorsal joint region 32, the absorbent body 1 becomes a curved portion that faces the skin along the length direction Y. In addition, similar to the ventral portion 10F, the elastic material of the lateral edge extends to the dorsal non-jointed region 42. As a result, in the dorsal non-jointed region 42, the same effect as in the ventral non-jointed region 41 occurs, and the bending portion that deforms along the body length direction Y curves inward in the waist circumference direction X. In this way, in the dorsal portion 10R as well, the absorbent body 1 wraps around the lower end of the wearer's lumbar spine, the upper part of the buttocks (at the height of the sacrum), and even the groin, thereby improving the prevention of leakage from the crotch of the diaper 10.

[0054] From the viewpoint of the above, the width W8 of the narrow central joint region 32 on the dorsal side is preferably 90% or less of the width W7 of the upper wide joint region 31 on the dorsal side and 85% or less of the width W9 of the lower wide joint region 33 on the dorsal side, more preferably 80% or less. Furthermore, from the viewpoint of improving the adhesion between the absorbent body 1 and the dorsal outer casing 22, the width W8 is preferably 10% or more of the width W7 and W9, more preferably 15% or more, and even more preferably 20% or more. In the example shown in Figure 2, in the dorsal central narrow joint region 32, which has a stepped planar shape, the width of the narrower region is W8A, and the width of the wider region is W8B. It is preferable that both widths W8A and W8B are within the range of width W8, and it is preferable that width W8B is the same as width W2 of the ventral central narrow joint region 52.

[0055] The widths W7 and W9 in the waist circumference direction X of the wide upper dorsal joint region 31 and the wide lower dorsal joint region 33 may be the same or different. From the viewpoint of increasing the flexibility of the absorbent material 16 or absorbent body 1 and improving the ease with which the side of the absorbent material rises, it is preferable that they be the same. The widths W7 and W9 of the wide upper dorsal joint region 31 and the wide lower dorsal joint region 33 in the waist circumference direction X may be the same as the width of the absorbent body 1 in the waist circumference direction X, or they may be shorter. From the viewpoint of making it easier to widen the waist circumference, it is preferable to make them shorter than the absorbent body 1.

[0056] The dorsal central narrow joint region 32 is preferably located in the center of the dorsal outer casing 22 in the direction X around the waist. The width W8 of the narrow central joint region 32 on the back side in the waist direction X is preferably 50% or less, more preferably 40% or less, and even more preferably 30% or less, of the width W10 of the back outer body 22 in the waist direction X, from the viewpoint of making it easier for the absorbent body 1 to fold when the wearer's body bends. Furthermore, the width W8 is preferably 10% or more, and more preferably 15% or more, from the viewpoint of improving the fit of the back portion 10R. With this configuration, the area on the outer side of the narrow central joint region 32 on the back side in the width direction can sufficiently respond and bend due to the force that pushes up the absorbent body 16 when the wearer sits down, etc. In this respect as well, it is preferable that both width W8A and width 8B are within the range of width W8 described above, and it is preferable that width W8B is the same as width W2 of the ventral central narrow joint region 52.

[0057] The side edge elastic body 18 is arranged across the ventral non-jointed region 41 and the dorsal non-jointed region 42, and it is preferable that the length H9 of the side edge elastic body 18 arranged in the dorsal non-jointed region 42 is longer than the length H8 of the side edge elastic body 18 arranged in the ventral non-jointed region 41. This makes it easier to more reliably create the upright position of both sides 1A, 1A of the absorbent body 1 by the side edge elastic body 18 in the dorsal side where the force transmitted when the wearer sits is less likely to occur. Here, the length H9 of the side edge elastic body 18 arranged in the dorsal non-jointed region 42 means the length in the body length direction Y of the side edge elastic body 18 that is positioned to overlap the dorsal non-jointed region 42 in the unfolded state. If the dorsal non-jointed region 42 includes the joining and fixing portion 181 of the side edge elastic body 18, it includes both the length of the side edge elastic body 18 that is joined at the joining and fixing portion 181 and the length of the side edge elastic body 18 that is not joined. Similarly, the length H8 of the lateral edge elastic body 18 located in the ventral non-jointed region 41 refers to the length Y in the height direction of the lateral edge elastic body 18 located in a position overlapping the dorsal non-jointed region 42 in the unfolded state. If the dorsal non-jointed region 42 includes the joining and fixing portion 181 of the lateral edge elastic body 18, then the length includes both the length of the lateral edge elastic body 18 that is joined at the joining and fixing portion 181 and the length of the lateral edge elastic body 18 that is not joined. In the example shown in Figure 2, both the dorsal non-jointed region 42 and the ventral non-jointed region 41 include both the lateral edge elastic body 18 that is joined at the joining and fixing portion 181 and the lateral edge elastic body 18 that is not joined. From the viewpoint of making it easier to bend the dorsal absorber with the force of the lateral edge elastic body 18, the length H9 of the lateral edge elastic body 18 located in the dorsal non-jointed region 42 is preferably 1.5 times or more, more preferably 1.3 times or more, and even more preferably 4 times or more, the length H8 of the lateral edge elastic body 18 located in the ventral non-jointed region 41. Furthermore, from the viewpoint of suppressing the shrinkage of the dorsal portion 10R around the waist due to the lateral edge elastic body 18 and maintaining a good fit around the waist, the length H8 is preferably 10 times or less, more preferably 8 times or less, and even more preferably 7 times or less, the length H7.

[0058] It is preferable that the average basis weight of the absorbent material 16 positioned in a location overlapping with the dorsal non-jointed area 42 is smaller than the average basis weight of the absorbent material 16 positioned in a location overlapping with the ventral non-jointed area 41. This makes it easier to ensure that the upright position of both sides 1A, 1A of the absorbent body 1 is more reliably achieved in the dorsal area, where force from the wearer sitting or other movements is less likely to be transmitted. From the viewpoint of improving liquid absorption in the dorsal portion 10R, the average basis weight of the absorbent material 16 positioned in a location overlapping with the dorsal non-jointed region 42 is preferably 10% or more, more preferably 15% or more, and even more preferably 25% or more, of the average basis weight of the absorbent material 16 positioned in a location overlapping with the ventral non-jointed region 41. Furthermore, from the viewpoint of improving the flexibility of the absorbent material 16 or absorbent body 1 in the dorsal portion 10R, the average basis weight of the absorbent material 16 positioned in the dorsal non-jointed region 42 is preferably 90% or less, more preferably 70% or less, and even more preferably 50% or less, of the average basis weight of the absorbent material 16 positioned in the ventral non-jointed region 41.

[0059] It is preferable that the length H6 in the body length direction Y of the narrow adhesive area 32 in the central dorsal side is longer than the length H2 in the body length direction Y of the narrow bonding area 52 in the central ventral side. By increasing the bend of the non-bonded portion 42 on the skin side, the upright position of both sides 1A, 1A of the absorbent body 1 on the dorsal side 10R can be made more reliable, thereby preventing leakage of excrement, including feces. From the viewpoint of improving the flexibility of the absorbent body 16 or absorbent main body 1 in the dorsal portion 10R, the length H6 in the Y direction of the dorsal central narrow bonding region 32 is preferably 1.1 times or more, more preferably 1.5 times or more, and even more preferably 2 times or more, than the length H2 in the Y direction of the ventral central narrow bonding region 52. Furthermore, from the viewpoint of improving the adhesion between the absorbent main body 1 and the dorsal outer casing 22, the length H6 in the Y direction of the dorsal central narrow bonding region 32 is preferably 5 times or less, more preferably 4 times or less, and even more preferably 3 times or less, than the length H2 in the Y direction of the ventral central narrow bonding region 52.

[0060] Each component of the diaper 10 can be formed using various materials used in this type of article. For example, the materials for the outer layer sheets 61 and 63 and the inner layer sheets 62 and 64 that constitute the outer casing 2 include nonwoven fabrics, woven fabrics, knitted fabrics, and resin films produced by various manufacturing methods, such as air-through nonwoven fabrics, heat-rolled nonwoven fabrics, spunlace nonwoven fabrics, spunbond nonwoven fabrics, and melt-blown nonwoven fabrics, respectively. Sheet materials formed by laminating and integrating these materials can also be used. Various materials can be used for this purpose. For example, synthetic fibers made of polyethylene, polypropylene, polyester, and other thermoplastic resins can be used. Furthermore, it is preferable to use nonwoven fabric for the inner layer sheets 62 and 64 from the viewpoint of improving breathability and texture, and it is preferable to use water-repellent nonwoven fabric from the viewpoint of preventing leakage of excrement. The absorbent 16 can be any material used in this type of article without any particular limitations. For example, an absorbent core made of an aggregate of hydrophilic fibers such as pulp is covered with a core wrap sheet. The absorbent core may contain a superabsorbent polymer in addition to the hydrophilic fibers. The material of the core wrap sheet can be paper or pulp sheet manufactured using hydrophilic fibers as raw materials, or a hydrophilic nonwoven fabric. Furthermore, the absorbent 16 may be in the form of a sheet. Examples of such sheet-like materials include paper or pulp sheets manufactured using hydrophilic fibers as raw materials. Other examples include absorbent sheets in which an absorbent core made of an aggregate of superabsorbent polymer material is sandwiched and fixed between two base sheets (absorbent paper or nonwoven fabric) (for example, the absorbent sheet described in Japanese Patent Application Publication No. Hei 8-246395 and the polymer sheet described in Japanese Patent Application Publication No. 2004-275225).

[0061] As for the materials of the various elastic bodies mentioned above, ordinary elastic materials used in absorbent articles such as diapers and sanitary napkins can be used. For example, the materials can include synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. In terms of form, thread-like or string-like materials (such as flat rubber) with a rectangular, square, circular, or polygonal cross-section can be used, or multifilament-type thread-like materials can be used.

[0062] Furthermore, the materials constituting the absorbent body 1 can be any material commonly used in this type of diaper without any particular restrictions.

[0063] The pant-type absorbent article of the present invention is not limited to the embodiment of the diaper 10 described above, but is a concept that includes various items having a pant-type structure. Furthermore, the absorbent pant-type article of the present invention may be for infants or adults, and may take a form other than a diaper. For example, other forms may include sanitary shorts, panty-type sanitary napkins, disposable shorts, etc.

[0064] With regard to the embodiments described above, the present invention further discloses the following pant-type absorbent articles. <1> A pant-type absorbent article having an absorbent body and an outer casing disposed on the non-skin side of the absorbent body, comprising an abdominal portion disposed on the abdominal side of the wearer, a crotch portion disposed on the groin side, and a back portion disposed on the back side, having a waist circumference direction and a body length direction, The absorbent body extends along the length direction from the center in the waist direction, The ventral portion has a ventral joining region where the outer casing and the absorbent body are joined and fixed in the region where the outer casing and the absorbent body overlap, and a ventral non-joint region where the outer casing and the absorbent body are not joined, the ventral joining region includes a ventral central narrow joining region, and a ventral upper wide joining region and a ventral lower wide joining region, which are located above and below the ventral central narrow joining region in the body length direction and are wider in the waist direction than the ventral central narrow joining region, the ventral non-joint region is located to the left and right outward in the waist direction of the ventral central narrow joining region, The absorbent body has elastic side edge bodies on both sides that are stretchable along the length direction, and these elastic side edge bodies extend to the ventral non-jointed region. Absorbent pants. <2> The absorbent body has an absorbent material, and the absorbent material comprises a high-basis-weight section and a low-basis-weight section with different basis weights, and the low-basis-weight section and the side edge elastic body are arranged adjacent to each other in the direction of the waist. <1> Absorbent pant-type articles as described above. <3> The absorbent body has a pair of upright bases arranged along the length direction, which cause both sides of the absorbent body to stand up due to the expansion and contraction of the elastic side edge material. <2> Absorbent pant-type articles as described above. <4> The upright base extends to the ventral non-joint region, <3> Absorbent pant-type articles as described above. <5> The upright base portion includes a slit portion formed in the absorbent body, <3> or <4> Absorbent pant-type articles as described above. <6> The upright base portion includes the boundary portion between the high basis weight region and the low basis weight region of the absorber, <3> or <4> Absorbent pant-type articles as described above. <7> The distance around the waist between the standing base portions in the ventral non-jointed region is greater than the width around the waist of the ventral central narrow jointed region, <3> ~ <6> A pant-type absorbent article described in any one of the following. <8> The absorbent body at a position overlapping with the ventral central narrow bonding region is provided with the high basis weight region of the absorbent body. <2> ~ <7> A pant-type absorbent article described in any one of the following. <9> The average basis weight of the absorbent positioned in a location overlapping with the ventral non-jointed region is lower than the average basis weight of the absorbent positioned in a location overlapping with the ventral central narrow jointed region. <2> ~ <8> A pant-type absorbent article as described in any one of the items. <10> The absorbent body has a surface sheet on the skin-facing side of the absorbent body and a back sheet on the non-skin-facing side of the absorbent body, the surface sheet extends in the direction around the waist from the skin-facing side of the absorbent body to the side edge and then to the non-skin-facing side, there is a fixing portion at the non-skin-facing side of the upright base where the surface sheet and the back sheet are joined, a bag-like portion of the surface sheet is provided that covers the absorbent body from the side edge to the upright base, and the side edge elastic body is provided on the side edge of the absorbent body and enclosed within the bag-like portion of the surface sheet, <3> ~ <9> A pant-type absorbent article described in any one of the following. <11> The width of the ventral central narrow joint region in the direction of the waist is the same as or narrower than the distance between the fixing parts in the direction of the waist. <10> Absorbent pant-type articles as described above. <12> The back portion has a back joining region where the outer casing and the absorbent body overlap, and a back non-joint region where the outer casing and the absorbent body are joined and fixed, and the back joining region includes a back central narrow joining region, and a back upper wide joining region and a back lower wide joining region, which are located above and below the back central narrow joining region in the body length direction and are wider in the waist direction than the back central narrow joining region, and the back non-joint region is located to the left and right outward in the waist direction of the back central narrow joining region, <1> ~ <11> A pant-type absorbent article described in any one of the following. <13> The lateral edge elastic body is arranged across the ventral non-joint region and the dorsal non-joint region, and the length of the lateral edge elastic body arranged in the dorsal non-joint region is longer than the length of the lateral edge elastic body arranged in the ventral non-joint region. <12> Absorbent pant-type articles as described above. <14> The average basis weight of the absorbent positioned in a location overlapping with the dorsal non-jointed region is smaller than the average basis weight of the absorbent positioned in a location overlapping with the ventral non-jointed region. <12> or <13> Absorbent pant-type articles as described above. <15> The length in the body length direction of the dorsal central narrow bonding region is longer than the length in the body length direction of the ventral central narrow bonding region, <12> ~ <14> A pant-type absorbent article described in any one of the following. [Explanation of Symbols]

[0065] 1. Absorbent body 1A Side of the absorbent body in the length direction 1K bent part 14 Surface sheet 15 Back sheet 16 Absorbent 16A Upper absorption layer 16B Lower absorption layer 161 High basis weight part 162 Low basis weight part 17 Side Seats 18. Side edge elastic body 181 Joint fixing part 19 Orthobase 2. Exterior 21 Ventral outer casing 22 Dorsal exterior body 3. The region on the dorsal side where the outer casing and the absorbent body are joined and fixed together (dorsal joining region) 31 Wide dorsal upper bonding region 32 Dorsal central narrow junction area 33 Dorsal lower wide bonding region 41 Ventral nonunion area 42 Dorsal nonunion area 5. Region on the ventral side where the outer casing and the absorbable body are joined and fixed together (ventral joining region) 51. Broad ventral superior junction region 52 Ventral central narrow junction area 53. Ventral inferior broad junction region 61, 63 Outer layer sheet 62, 64 Inner layer sheets 7. Waist elastic material 8 Crotch side extension 10 diapers 10F The abdominal side of the diaper 10C Diaper crotch area 10R Diaper back side 11 Waist joint 12 Waist opening 13 Leg opening Y Diaper length direction (or the long direction of the absorbent body) X Diaper waist circumference in the width direction (or width direction of the absorbent body)

Claims

1. A pants-type absorbent article having an absorbent main body and an exterior body arranged on a non-skin-facing side of the absorbent main body, and including a ventral side portion arranged on a wearer's ventral side, a crotch portion arranged on a crotch side, and a posterior side portion arranged on a posterior side, and having a waist circumference direction and a body length direction, The absorbent body extends along the body length direction at the center in the waist circumference direction, the abdominal portion has, in an area where the exterior body and the absorbent body overlap, an abdominal side bonding area where the exterior body and the absorbent body are bonded and fixed, and an abdominal side non-bonding area where the exterior body and the absorbent body are not bonded, the abdominal side bonding area includes an abdominal side central narrow bonding area, and an abdominal side upper wide bonding area and an abdominal side lower wide bonding area which are arranged above and below the abdominal side central narrow bonding area in the body length direction and have a width wider in the waist circumference direction than the abdominal side central narrow bonding area, the abdominal side non-bonding areas are arranged on the left and right outside of the abdominal side central narrow bonding area in the waist circumference direction, The absorbent body has side edge elastics arranged on both sides thereof so as to be stretchable along the body length direction, and the side edge elastics extend to the abdominal side non-jointed region. Pants-type absorbent article.

2. The pants-type absorbent article according to claim 1, wherein the absorbent body has an absorbent body having a high basis weight section and a low basis weight section with different basis weights, and the low basis weight section and the side edge elastic body are arranged in adjacent positions in the waist circumference direction.

3. The pants-type absorbent article according to claim 2, wherein the absorbent body has a pair of standing base portions arranged along the length direction when both side portions of the absorbent main body stand up due to contraction of the side edge elastic body.

4. The pant-type absorbent article according to claim 3 , wherein the standing base portion extends to the abdominal non-jointed region.

5. The pants-type absorbent article according to claim 3 or 4, wherein the standing base portion includes a slit portion formed in the absorbent body.

6. The pants-type absorbent article according to claim 3 or 4, wherein the standing base portion includes a boundary portion between the high basis weight portion and the low basis weight portion of the absorbent body.

7. The pants-type absorbent article according to claim 3 or 4, wherein a distance between the standing base portions in the abdominal side non-bonded region in the waist circumference direction is greater than a width of the abdominal side central narrow bonded region in the waist circumference direction.

8. The pants-type absorbent article according to any one of claims 2 to 4, wherein the high basis weight portion of the absorbent body is arranged in the absorbent main body at a position overlapping with the abdominal central narrow bonding region.

9. The pants-type absorbent article according to any one of claims 2 to 4, wherein the average basis weight of the absorbent body arranged in a position overlapping with the abdominal non-bonded region is lower than the average basis weight of the absorbent body arranged in a position overlapping with the abdominal central narrow bonded region.

10. 5. The pants-type absorbent article according to claim 3 or 4, wherein the absorbent main body has a top sheet on the skin-facing side of the absorbent body and a back sheet on the non-skin-facing side of the absorbent body, the top sheet extends in the waist circumference direction from the skin-facing side of the absorbent body to the side edge and the non-skin-facing side, a fixed portion where the top sheet and the back sheet are joined is located at the non-skin-facing side of the standing base, a bag-shaped portion of the top sheet is arranged to encase the absorbent body from the side edge to the standing base, and the side edge elastic is arranged at the side edge of the absorbent body and is contained in the bag-shaped portion of the top sheet.

11. The pants-type absorbent article according to claim 10, wherein a width of the abdominal central narrow joining region in the waist circumference direction is equal to or narrower than a distance between the fixed parts in the waist circumference direction.

12. The pants-type absorbent article according to any one of claims 1 to 4, wherein the rear portion has a rear bonded region where the rear body and the absorbent body are bonded and fixed at an overlapping portion between the rear body and the absorbent body, and a rear non-bonded region where the rear body and the absorbent body are not bonded, the rear bonded region including a rear central narrow bonded region and a rear upper wide bonded region and a rear lower wide bonded region which are arranged above and below the rear central narrow bonded region in the body length direction and have a width wider in the waist circumference direction than the rear central narrow bonded region, and the rear non-bonded regions are arranged to the left and right outside the rear central narrow bonded region in the waist circumference direction.

13. The pants-type absorbent article according to claim 12, wherein the side edge elastics are arranged across the abdominal non-bonded region and the back side non-bonded region, and the length of the side edge elastics arranged in the back side non-bonded region is longer than the length of the side edge elastics arranged in the abdominal non-bonded region.

14. The pants-type absorbent article according to claim 12, wherein the average basis weight of the absorbent body arranged in a position overlapping the back-side non-bonded region is smaller than the average basis weight of the absorbent body arranged in a position overlapping the ventral-side non-bonded portion.

15. The pants-type absorbent article according to claim 12, wherein the length of the rear-side central narrow bonding region in the body length direction is longer than the length of the ventral-side central narrow bonding region in the body length direction.

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