EA037912B1 - Disposable diaper - Google Patents

Abstract

A diaper (1) comprises an absorbent main body (10), a posterior-side waist section (20), and a stomach-side waist section (30). Both side end sections (200) of the posterior-side waist section (20) and both side end sections (300) of the stomach-side waist section (30) are joined, respectively. A cut section (40) is provided in an upper end section (34a) in the vertical direction of the stomach-side waist section (30) that is a center section in the side direction. An overlapping section (35) having a greater number of laminated sheets than a number of laminated sheets in a lower end section (34b) of the stomach-side waist section (30) in the vertical direction is provided further in the vertical direction on the upper side than the lower end (402) of the cut section (40) of the stomach-side waist section (30).

Description

The technical field to which the invention relates

The present invention relates to a disposable diaper.

Prior art

Known is a pull-type disposable diaper having one hole for the waist and two holes for the legs. For example, Patent Document 1 discloses a disposable diaper including a front waist section (front body), a crotch section, a back waist section (back body), an outer member formed by appropriately joining both end portions (side edges) of the front waist the section and the rear waist section with each other to provide two joint portions (side edge joint portions), and an absorbent main body disposed inside the outer member. FIG. 3A, 3B, and 3C, there is provided a disposable diaper having a notch formed in the center of the upper end portion of the front waist section such that the upper end edge of the front waist section is formed with a downward convex shape.

The essence of the invention

Technical problem

In a disposable diaper having a cutout in the center of the upper end portion of the front waist section, the upper end portion of the front waist section is discontinuous in the lateral direction due to the cutout. Thus, if at the time of manufacture, both side end portions of the rear waist section and both side end portions of the front waist section are connected appropriately to each other in a state in which the front waist section is pulled laterally, they can be connected in a state in which the upper end portion, which is located on both lateral sides of the cutout, will curl downward, that is, towards the crotch side of the wearer. Thus, misalignment can occur in the connecting part.

In view of the above problems, an object of the invention is to provide a disposable diaper capable of preventing displacement in the connecting portions between both side end portions of the front waist section and both side end portions of the rear waist section.

According to an aspect of the disclosure, there is provided a disposable diaper having a vertical direction and a lateral direction intersecting with the vertical direction, the disposable diaper comprising an absorbent main body for absorbing discharge; a back waist section located on the side of one end of the absorbent main body and a front waist section located on the side of the other end of the absorbent main body, where both side end portions of the rear waist section and both side end portions of the front waist section are respectively connected to each other, the cutout is made in that part of the upper in the vertical direction, the end part of the front waist section, which is central in the lateral direction, while the part in which the number of layers is greater than the number of layers in the lower in the vertical direction, the end part of the front waist section, is provided above in a vertical direction than the lower end of the notch of the front waist section. Other features of the present disclosure will become apparent from the description in the following description and the accompanying drawings.

According to the present disclosure, it is possible to prevent displacement in the connecting portions between both side end portions of the front waist section and both side end portions of the rear waist section.

Brief Description of Drawings

FIG. 1 is a schematic perspective view illustrating an illustrative configuration of a diaper according to a first embodiment of the disclosure.

FIG. 2 is a schematic plan view illustrating the unfolded and extended state of the diaper as viewed from the side facing the wearer's skin.

FIG. 3 is a sectional view taken along line III-III in FIG. 2.

FIG. 4A to 4C are explanatory schematic views illustrating a front waist section.

FIG. 4A is an explanatory plan view illustrating the area around the front waist section in the unfolded and extended state.

FIG. 4B is a sectional view taken along line IVB-IVB in FIG. 4A.

FIG. 4C is a sectional view taken along line IVC-IVC in FIG. 4A.

FIG. 5 is an explanatory schematic diagram illustrating a diaper manufacturing process.

FIG. 6 is an explanatory schematic diagram illustrating a folding process in a diaper manufacturing process.

FIG. 7A to 7C are explanatory schematic views illustrating a diaper in a comparative example, in which FIG. 7A is an explanatory plan view illustrating the state of the front waist section at the time of manufacture, FIG. 7B is a cross-sectional view illustrating the front waist section of the diaper, and FIG. 7C represents

- 1 037912 is an explanatory plan view illustrating the state of the connecting portion.

FIG. 8A to 8C are explanatory schematic views illustrating a front waist section of a diaper according to a first modification, in which FIG. 8A is an explanatory plan view illustrating the area around the front waist section in the unfolded and stretched state, FIG. 8B is a sectional view taken along line VIIIBVIIIB in FIG. 8A, and FIG. 8C is a sectional view taken along line VIIIC-VIIIC in FIG. 8C.

FIG. 9A to 9C are explanatory schematic views illustrating a front waist section of a diaper according to a second modification, in which FIG. 9A is an explanatory plan view illustrating the area around the front waist section in the unfolded and stretched state, FIG. 9B is a sectional view taken along line IXB-IXB in FIG. 9A, and FIG. 9C is a sectional view taken along line IXC-IXC in FIG. 9A.

FIG. 10A to 10C are explanatory schematic views illustrating a front waist section of a diaper according to a second embodiment of the disclosure, in which FIG. 10A is an explanatory plan view illustrating the area around the front waist section in the unfolded and stretched state, FIG. 10B is a cross-sectional view taken along line XB-XB in FIG. 10A, and FIG. 10C is a cross-sectional view taken along line XC-XC in FIG. 10A.

FIG. 11 is an explanatory schematic diagram illustrating an overlapping process in a diaper manufacturing process according to the second embodiment.

Description of embodiments

At least the following features will become readily apparent from the description and accompanying drawings.

The following description discloses a disposable diaper having a vertical direction and a lateral direction intersecting the vertical direction, the disposable diaper comprising an absorbent main body for absorbing discharge; a back waist section located on the side of one end of the absorbent main body and a front waist section located on the side of the other end of the absorbent main body, where both side end portions of the rear waist section and both side end portions of the front waist section are respectively connected to each other, the cutout is made in that part of the upper in the vertical direction, the end part of the front waist section, which is central in the lateral direction, while the part in which the number of layers is greater than the number of layers in the lower in the vertical direction, the end part of the front waist section, is provided above in a vertical direction than the lower end of the notch of the front waist section.

Since, according to the construction of such a disposable diaper, a portion in which the number of layers is greater than the number of layers in the lower end portion is provided on both sides of the cutout in the front waist section, rigidity in this portion is increased. Thus, when both side end portions of the front waist section and both side end portions of the rear waist section are respectively connected to each other in a state in which the front waist section is stretched in the lateral direction, it is less likely that the upper end portion is downwardly twisted. Accordingly, it is possible to prevent displacement in the connecting portions between both side end portions of the front waist section and both side end portions of the rear waist section.

In the disposable diaper described above, it is desirable that the portion in which the number of plies is greater than the number of plies in the lower end portion of the front waist section is formed in the entire area from the edge of the notch to both side end portions of the front waist section in the lateral direction.

According to the construction of such a disposable diaper, a portion in which the number of layers is greater than the number of layers in the lower end portion in the entire region from the edge of the cutout to both side end portions of the front waist section is provided on both sides of the cutout of the front waist section, so the rigidity increases along its entire length in the lateral direction. Accordingly, when both side end portions of the front waist section and both side end portions of the rear waist section are respectively connected to each other in a state in which the front waist section is pulled laterally, the upper end portion of the front waist section is less likely to be twisted downward.

In the disposable diaper described above, it is desirable that the lower end of the portion in which the number of layers is greater than the number of layers in the lower end portion of the front waist section is positioned lower in the vertical direction than the lower end of the opening.

According to the construction of such a disposable diaper, the portion in which the number of layers is greater than the number of layers in the lower end portion is formed to extend lower than the lower end of the cutout in the front waist section, and therefore, the portion having high rigidity increases in the vertical direction.

Accordingly, when both side end portions of the front waist section and both side end portions of the rear waist section are respectively connected to each other in a state where

- 2 037912 the front waist section is laterally tensioned, the upper end of the front waist section is less likely to curl downward.

In the disposable diaper described above, it is desirable that the lower end of the portion in which the number of layers is greater than the number of layers in the lower end portion of the front waist section is positioned lower in the vertical direction than the upper end of the absorbent main body.

According to the construction of such a disposable diaper, a portion in which the number of layers is greater than the number of layers in the lower end portion is provided up to the point where the portion overlaps the absorbent main body in the front waist section, so the portion having high rigidity increases in the vertical direction. ... Accordingly, when both side end portions of the front waist section and both side end portions of the rear waist section are respectively connected to each other in a state in which the front waist section is pulled laterally, the upper end portion of the front waist section is less likely to curl downward.

In the disposable diaper described above, it is desirable that the absorbent main body includes an absorbent core and that the lower end of the portion having more layers than the lower end portion of the front waist section is positioned lower in the vertical direction than the upper end of the absorbent cores.

Since, according to the construction of such a disposable diaper, a portion in which the number of layers is greater than the number of layers in the lower end portion is provided up to the point where the portion overlaps with the absorbent core having rigidity in the front waist section, the portion having high rigidity, increases vertically. Accordingly, when both side end portions of the front waist section and both side end portions of the rear waist section are respectively connected to each other in a state in which the front waist section is pulled laterally, the upper end portion of the front waist section is less likely to curl downward.

In the disposable diaper described above, it is desirable that the front waist section includes a sheet member and that the portion in which the number of layers is greater than the number of layers in the lower end portion of the front waist section includes the folded portion formed by folding down the upper in the vertical direction. , the end of the sheet element.

According to the construction of such a disposable diaper, the folded portion formed by folding down the upper end portion of the front waist section sheet member forms a portion in which the number of layers is greater than the number of layers in the lower end portion of the front waist section, thereby eliminating the need to provide a separate sheet member to increase the number of layers so that the number of materials can be reduced.

In the disposable diaper described above, it is desirable that the front waist section includes a sheet member and that the portion in which the number of layers is greater than the number of layers in the lower end portion of the front waist section is provided with a sheet member other than the sheet member defining the bottom end part.

According to the construction of such a disposable diaper, a portion in which the number of layers is greater than the number of layers in the lower end portion of the front waist section is formed by overlaying a separate sheet member other than the sheet member forming the lower end portion of the front waist section, whereby a disposable a diaper while eliminating the need for a complicated process, such as in contrast to the case in which the portion is formed by folding the sheet member.

In the disposable diaper described above, it is desirable that the upper end of the portion in which the number of layers is greater than the number of layers in the lower end portion of the front waist section is positioned lower in the vertical direction than the uppermost end of the front waist section.

According to the design of such a disposable diaper, the upper end of the portion in which the number of layers is greater than the number of layers in the lower end portion of the front waist section is located lower in the vertical direction than the uppermost end of the front waist section, that is, the upper end of the front waist section does not have a portion in which the number of plies is greater than the number of plies in the lower end portion of the front waist section so that the rigidity is reduced in the vicinity of the waist opening, whereby it is possible to improve the soft texture.

In the disposable diaper described above, it is desirable for the front waist section to include an elastic located on each side of the opening and higher in the vertical direction than the lower end of the opening, the elastic being laterally stretchable and contractable.

According to the construction of such a disposable diaper, the front waist section has a stiff elastic member that is located on each side of the cutout and is higher in the vertical direction than the lower end of the cutout, so that stiffness increases at the upper end of the front waist section. Accordingly, when both side end portions of the front waist section and both side end portions of the rear waist section are respectively connected

3 037912 with each other in a state in which the front waist section is pulled laterally, the upper end portion of the front waist section is less likely to curl downward.

In the disposable diaper described above, it is desirable that the elastic be provided in a portion in which the number of layers is greater than the number of layers in the lower end portion of the front waist section.

According to the construction of such a disposable diaper, a stiff elastic member is provided in a portion in which the number of plies is greater than the number of plies in the lower end portion of the front waist section, so that rigidity is increased in that portion. Accordingly, when both side end portions of the front waist section and both side end portions of the rear waist section are respectively connected to each other in a state in which the front waist section is pulled laterally, the upper end portion of the front waist section is less likely to curl downward.

Disclosed is a method of manufacturing a disposable diaper having a vertical direction and a side direction intersecting the vertical direction, wherein the disposable diaper includes an absorbent main body for absorbing discharge, a back waist section located on the side of one end of the absorbent main body, and a front waist section, located on the side of the other end of the absorbent main body, the method includes a first process of increasing the number of layers on the side located higher than the lower in the vertical direction, the end portion of the front waist section; a second process for forming a notch in that vertically upper portion of an end portion of the front waist section that is laterally central after the first process, and a third process for appropriately joining both side end portions of the rear waist section and both side end portions of the front waist section to each other with the other after the second process, wherein in the second process, the notch is formed such that the lowermost end of the notch is located lower than the upper end of the portion having more layers that is formed in the first process.

According to such a method of manufacturing a disposable diaper, a cutout is formed and both side end portions of the rear waist section and both side end portions of the front waist section are respectively connected to each other in a state in which rigidity is increased by increasing the number of layers on the side higher than the lower end of the front waist section. Accordingly, the upper end portion of the front waist section is less likely to curl downward during such joining, whereby it is possible to prevent displacement in the connecting portions between both side end portions of the front waist section and both side end portions of the rear waist section.

First embodiment

A pull-on disposable diaper generally worn by a newborn infant will be described as the disposable diaper 1 according to the first embodiment of the present disclosure (hereinafter simply referred to as diaper 1) by way of example.

Diaper configuration 1

First, referring to FIG. 1-3, the configuration of the diaper 1 will be described.

FIG. 1 is a schematic perspective view illustrating an exemplary configuration of a diaper 1. FIG. 2 is a schematic plan view illustrating the unfolded and stretched state of the diaper 1 as viewed from the side facing the wearer's skin. FIG. 3 is a sectional view taken along line III-III in FIG. 2.

The diaper 1 has a vertical direction, a lateral direction intersecting with a vertical direction, as illustrated in FIG. 1 and the thickness direction illustrated in FIG. 3. The vertical side of the wearer's waist will be referred to as the top side, and the wearer's crotch side will be referred to as the bottom side. In addition, assuming that the wearer is wearing the diaper 1, the side on the front side of the wearer will simply be called the front side, and the side on the back side of the wearer will simply be called the back side. The thickness direction refers to the direction in which the elements of the diaper 1 are layered on top of each other. Assuming that the wearer wears the diaper 1, the side that comes into contact with the wearer's skin will be called the skin side, the opposite side will be called the non-skin side.

It is assumed that the diaper 1 is a so-called three-piece type diaper having a ribbon-like absorbent main body 10, a back waist section 20 to be placed on the rear side of the wearer, and a front waist section 30 to be placed on the front side of the wearer.

As illustrated in FIG. 2, in the unfolded diaper 1, the rear waist section 20 is positioned on the side 10a of one longitudinally defined end of the absorbent main body 10, the front waist section 30 is positioned on the side 10b of the other longitudinally defined end of the absorbent main body 10. That there is an absorbent main body 10 extends between the spaced apart rear waist section 20 and the front waist section 30.

- 4 037912

The absorbent main body 10 of the diaper 1 is folded in half about its center in the longitudinal direction so that the uppermost end 201 of the back waist section 20 and the uppermost end 301 of the front waist section 30 are aligned with each other. Then, the two side end portions 200 of the back waist section 20 and the two side end portions 300 of the front waist section 30 are joined together to form a pull-on diaper having one waist hole 1HB and two leg holes 1HL (see FIG. 1) ... Thus, the two connecting portions 100 are formed by correspondingly joining both side end portions 200 of the rear waist section 20 and both side end portions 300 of the front waist section 30 to each other, as illustrated in FIG. one.

A plurality of elastic members disposed along the lateral direction are provided in the back waist section 20 and the front waist section 30. Since the plurality of elastic members are pulled laterally when the diaper 1 is worn, the diaper 1 is adhered to the back waist and the front waist of the wearer to improve fit. It should be noted that the diaper 1 has a stretched unfolded state of FIG. 2. Here, the stretched state refers to a state in which the back waist section 20 and the front waist section 30 are stretched without wrinkles / folds by stretching the plurality of elastic members of the rear waist section 20 and the front waist section 30 in the lateral direction. More specifically, in the stretched state, the rear waist section 20 is stretched to such a state that the lateral dimension of the rear waist section 20 becomes equal to or close to the laterally determined size of the sheet member of the rear waist section 20 itself, the front waist section 30 is stretched until the lateral dimension of the front waist section 30 becomes equal to or close to the laterally determined dimension of the sheet metal member of the front waist section 30 itself.

The absorbent body 10 is a member that is positioned against the perineum of the wearer to absorb secretions such as urine. As illustrated in FIG. 3, the absorbent main body 10 includes a topsheet 11 on the skin side, a backsheet 13 on the non-skin side, an absorbent core 12 disposed between the topsheet 11 and the backsheet 13, and an outer sheet 14 provided closer to the non-skin side to the skin with respect to the backsheet 13. As illustrated in FIG. 2, the absorbent main body 10 further has side sheets 15 located on both sides.

The topsheet 11 is a liquid-permeable sheet member such as a nonwoven fabric, and the backsheet 13 is a liquid-impermeable sheet member such as polyethylene or polypropylene. The absorbent core 12 is formed by overlapping liquid-absorbent materials such as cellulose fibers or superabsorbent polymer. It should be noted that the absorbent core 12 may be covered with a so-called core wrap in the form of a liquid-permeable sheet member such as a nonwoven fabric or tissue paper. Outer sheet 14 is a soft sheet member such as a nonwoven fabric.

The side sheets 15 are liquid impermeable sheet members obtained by applying a treatment to, for example, nonwovens or the like. As illustrated in FIG. 2, elastic members 151 extending / contracting in the longitudinal direction of the absorbent body 10 are provided at those ends of the side sheets 15 that are laterally outer. As a result, both side portions of the absorbent main body 10 serve as so-called leg assemblies LG to be placed on the legs of the wearer. For example, an elastic thread or elastic sheet can be used as the elastic member 151. Note that in FIG. 2, elastic members 151 are shown in dash-and-dot lines with one stroke.

Meanwhile, the ends of the side sheets 15, inner in the lateral direction, are folded outwardly in the lateral direction, so that folded portions with elastic members (not shown) are provided that can be stretched / retracted along the longitudinal direction of the absorbent body 10. As a result, the ends of the side sheets 15 , laterally inner, serve as so-called LSG barrier cuffs capable of being lifted upward on the side facing the skin to prevent leakage of secretions.

As illustrated in FIG. 2, the back waist section 20 has a rectangular shape with a long side extending laterally as seen in plan view. As illustrated in FIG. 3, the back waist section 20 has a sheet 21 forming an inner layer provided on the skin side, a sheet 22 forming an outer layer not provided on the skin side, and a plurality of elastic members 23 configured to be stretchable and retracted in the lateral direction. The sheet 21 forming the inner layer and the sheet 22 forming the outer layer are sheet members such as nonwoven fabrics.

The plurality of elastic members 23 are disposed adjacent to each other and at a distance from each other in the vertical direction between the sheet 21 forming the inner layer and the sheet 22, forming

- 5,037912 binding the outer layer, and attached to the sheet 21 forming the inner layer and the sheet 22 forming the outer layer, being stretched in the lateral direction. According to an embodiment of the present disclosure, a plurality of elastic threads are used as a plurality of elastic members 23. However, the elastic members are not limited to a plurality of elastic threads, for example, filamentary polyurethane elastic fibers, sheet-like elastic members or the like can also be used. It should be noted that a plurality of elastic threads 23 are shown in dashed lines in FIG. 1 and 2.

As illustrated in FIG. 2, elastic members 23 located higher in the vertical direction than the absorbent core 12 are continuous from one end to the other in the lateral direction. Elastic members 23 overlapping with the absorbent core 12 have discontinuous portions on the absorbent core 12. Thus, since the elastic members 23 have discontinuous portions on the absorbent core 12, it is possible to prevent the absorbent core 12 from being pulled too tightly laterally from the rear and allow fit of the absorbent core 12 on the back of the wearer without a gap. This prevents leakage of secretions.

As illustrated in FIG. 2, the front waist section 30 has a rectangular shape with a long side extending laterally as seen in a plan view. As illustrated in FIG. 3, the front waist section 30 has a sheet 31 forming an inner layer provided on the skin side, a sheet 32 forming an outer layer not provided on the skin side, and a plurality of elastic members 33 configured to stretch / contract in the lateral direction. The sheet 31 constituting the inner layer and the sheet 32 constituting the outer layer are sheet members such as nonwoven fabrics. According to an embodiment of the present disclosure, the front waist section 30 has a folded portion 320 formed by folding down the vertically upper end portion of the sheet 32 forming the outer layer. As illustrated in FIG. 3, the folded portion 320 is provided on the skin-facing side of the sheet 31 constituting the inner layer and on the non-skin-facing side of the absorbent body 10 in the thickness direction. This folded portion 320 will be described in detail below.

As illustrated in FIG. 1 and 2, the front waist section 30 has a notch 40 formed by cutting out that portion of the upper in the vertical direction, the end portion 34a, which is laterally central, downwardly from the uppermost end 301 with an arcuate shape. Thus, the upper end portion 34a refers to a region extending from the lowermost end 402 of the cutout 40 to the uppermost end 301 of the front waist section 30 in the vertical direction of the front waist section 30. It should be noted that although the cutout 40 has an arcuate shape protruding downward in an embodiment of the present disclosure, it may have other shapes such as a rectangular shape without being limited to an arcuate shape. Since the cutout 40 is formed by straight lines in this case, the design work can be simplified. For example, the cutout 40 may be a straight cut having a predetermined length in the vertical direction. In this case, it is possible to facilitate manufacture and prevent the formation of a cut portion to be discarded during manufacture. FIG. 3, the portions of the sheet 31 forming the inner layer and the sheet 32 forming the outer layer (including the folded portion 320) cut out during the formation of the cutout 40 are shown in dashed lines.

In this way, since the front waist section 30 has a cutout 40, it is possible to avoid a situation in which the wetted navel of a newborn infant as a wearer or a clip that a newborn infant wears on his navel to prevent bleeding touches the front waist section 30. In addition, it can also be avoided such a situation in which the one who puts the diaper 1 on the infant (mother or the like) worries about the diaper 1 coming into contact with the navel, etc. and pulls the diaper 1 upward insufficiently, leading to leakage of secretions. According to the embodiment of the present disclosure illustrated in FIG. 1 and 2, the rear waist section 20 does not have a cutout. However, a cutout can also be made in the rear waist section 20.

The plurality of elastic members 33 are disposed adjacent to each other and spaced apart in the vertical direction between the inner layer sheet 31 and the outer layer sheet 32, and are attached to the inner layer sheet 31 and the outer sheet 32. the layer being laterally stretched. In accordance with an embodiment of the present disclosure, a plurality of elastic threads are used as a plurality of elastic members 33. However, similar to a plurality of elastic members 23, other materials can also be used for a plurality of elastic members 33 instead of a plurality of elastic threads. For example, filamentary polyurethane elastic fibers, sheet-like elastic members or the like can also be used. It should be noted that the plurality of elastic threads 33 are shown in dashed lines in FIG. 1 and 2.

As illustrated in FIG. 2, an elastic member 33 located vertically higher than the absorbent core 12 and lower than the lower end 402 of the cutout 40 extends continuously from one end to the other in the lateral direction. Elastic element 33, located

- 6 037912 so that it overlaps the absorbent core 12, has a discontinuous portion on the absorbent core 12. Since the elastic member 33 has a discontinuous portion on the absorbent core 12, it is possible to prevent the absorbent core 12 from being pulled laterally from the front side and insert the absorbent core 12 in firm contact with the front of the media with no gap. This leads to the prevention of leakage of secretions.

In portions located on both sides of the cutout 40 and higher in the vertical direction than the lower end 402 of the cutout 40, the elastic member 33 is continuous from the edge 401 of the cutout 40 to both side end portions 300 of the front waist section 30.

Folded part 320

Next, referring to FIG. 4A-4C, the folded portion 320 of the front waist section 30 will be described in detail.

FIG. 4A to 4C are explanatory schematic views for describing the front waist section 30. FIG. 4A is an explanatory plan view illustrating the area around the front waist section 30 in the unfolded and stretched state. FIG. 4B is a sectional view taken along line IVB-IVB in FIG. 4A. FIG. 4C is a sectional view taken along line IVC-IVC in FIG. 4A. It should be noted that in FIG. 4B, portions of the sheet 31 forming the inner layer and the sheet 32 forming the outer layer (including the folded portion 320) cut out during the formation of the cutout 40 are shown in dashed lines.

As illustrated in FIG. 4B and 4C, since the front waist section 30 is formed with a folded portion 320, the front waist section 30 has a portion 35 in which the number of plies is greater than the number of plies in the lower end portion 34b. In the following description, a portion 35 in which the number of layers is greater than the number of layers in the lower end portion 34b will be referred to as an overlap portion 35. Specifically, the number of layers in the overlap portion 35 is three, while the number of layers in the lower end portion 34b of the front waist section 30 is two, so that the number of layers in the overlap portion 35 is greater than the number of layers in the lower end portion 34b. In this overlapping portion 35, the number of layers increases due to the folded portion 320. That is, the number of layers increases since the upper end portion of the sheet 32 forming the outer layer is folded downward. As a result, the stiffness of the overlap portion 35 exceeds that of the lower end portion 34b of the front waist section 30.

Here, stiffness refers to the ability to deform in response to an external force applied to the front waist section 30. As a stiffness value for comparing stiffness degrees, for example, a value obtained by dividing a value measured based on bending resistance by Gurley, for sample length. Gurley flexural strength can be determined based on JIS-L1096 (JIS - Japanese Industrial Standard) by using the No. 311 Gurley Stiffness Tester manufactured by YASUDA SEIKI SEISAKUSHO, LTD.

Thus, since the overlap portion 35 is formed by the folded portion 320, there is no need to provide a separate sheet member to increase the number of layers in the overlap portion 35. Thus, it is possible to reduce the number of members constituting the front waist section 30. However, the overlapped portion 35 is not necessarily formed by the folded portion 320. A case in which the overlapped portion 35 is formed by forming other types of sheet metal members will be described below in connection with the second embodiment. implementation.

In an embodiment of the present disclosure, as illustrated in FIG. 4A and 4B, the lower end 352 of the overlap portion 35 is vertically lower than the upper end 101 of the absorbent body 10 and higher than the upper end 121 of the absorbent core 12. Thus, the lower end 352 of the overlap portion 35 is located along at least lower in the vertical direction than the lower end 402 of the cutout 40.

In an embodiment of the present disclosure, as illustrated in FIG. 4C, the upper end 311 of the sheet 31 constituting the inner layer is located lower in the vertical direction than the uppermost end 301 of the front waist section 30. For this reason, similarly to the lower end portion 34b, the number of layers is two in the portion extending from the upper end 311 of the sheet 31 forming the inner layer to the uppermost end 301 of the front waist section 30 in the vertical direction. The overlapping portion 35 in which the number of layers is three corresponds to the portion from the lower end 322 of the folded portion 320 to the upper end 311 of the sheet 31 constituting the inner layer in the vertical direction.

That is, the position of the lower end 352 of the overlap portion 35 in the vertical direction is the same as the position of the lower end 322 of the folded portion 320, and the position of the upper end 351 of the overlap portion 35 in the vertical direction is the same as the position of the upper end 311 of the sheet 31 forming the inner layer. Thus, the upper end 351 of the overlap portion 35 is located lower in the vertical direction than the uppermost end 301 of the front waist section 30.

Thus, since the overlap portion 35 is not formed in the upper end portion of the front waist section 30 (in the portion located higher in the vertical direction than the upper end 311 of the inner layer sheet 31), the rigidity of the front waist section 30 in the vicinity of the opening

- 7 037912

The 1HB for the waist (see FIG. 1) is lower (the area near the hole 1HB is softer) than the stiffness of the overlapped portion 35. Thus, it is possible to improve the texture when wearing the diaper 1.

In an embodiment of the present disclosure, as illustrated in FIG. 4A, an overlap portion 35 extends from an edge 401 of the cutout 40 to one 300a of the end portions and the other end portion 300b (both end portions 300) of the front waist section 30 at a portion vertically higher than the lower end 402 of the cutout 40. Thus Thus, two elastic members 33 located on both sides of the cutout 40 of the front waist section 30 and higher in the vertical direction than the lower end 402 of the cutout 40 are provided in the overlap portion 35.

On the side vertically lower than the lower end 402 of the cutout 40, the overlap portion 35 extends continuously laterally from this one end portion 300a to the other end portion 300b of the front waist section 30. Thus, a plurality of elastic members 33 disposed lower in the vertical direction than the lower end 402 of the cutout 40 are provided in the overlapping portion 35. FIG. 4A, the limits of the overlapped portion 35 are shown in bold lines. Thus, according to an embodiment of the present disclosure, the overlap portion 35 extends from one side end portion 300a to the other side end portion 300b of the front waist section 30, excluding the notch 40. Thus, lateral rigidity is increased.

It should be noted that in the lower end portion 34b of the front waist section 30, the number of layers is two, so that its rigidity is lower than that of the overlapping portion 35. Since the lower end portion 34b is close to the wearer's feet, the lower end portion 34b is softer in the region of the wearer’s legs. Thus, it is possible to reduce the wearing discomfort by setting the rigidity of the lower end portion 34b to be lower than that of the overlap portion 35.

Diaper Making Method 1

Next, referring to FIG. 5 and 6, a method for manufacturing a diaper 1 will be described.

FIG. 5 is an explanatory schematic diagram illustrating the manufacturing process of the diaper 1. FIG. 6 is an explanatory schematic diagram illustrating the folding process S2 in the manufacturing process of the diaper 1.

As illustrated in FIG. 5, a method for manufacturing a diaper 1 according to an embodiment of the present disclosure includes a waist section forming process S1, a folding process S2, an absorbent body moving process S3, a notch forming process S4, a layering process S5, a joining process S6, and a cutting process S7.

In the process S1 of forming the waist section at the time of positioning the plurality of elastic members 23 and 33 extending along the conveying direction between the sheet member P1 forming the inner layer and including the sheet 21 of the rear waist section 20 forming the inner layer and the sheet 31 of the front waist section 30 constituting the inner layer and the sheet member P2 constituting the outer layer and including the sheet 22 of the rear waist section 20 constituting the outer layer and the sheet 32 of the front waist section 30 constituting the outer layer, these elements (sheet member P1 constituting the inner the layer, the sheet metal member P2 forming the outer layer, and the plurality of elastic members 23 and 33) are transported. In this case, the plurality of elastic members 23 and 33 move in the conveyance direction in the stretched state.

The cuts C1 and C2 for separating the sheet member P1 forming the inner layer and the sheet member P2 forming the outer layer into the side of the rear waist section 20 and the side of the front waist section 30, respectively, are formed in portions central to the width direction (perpendicular to the conveying direction) sheet elements. The cutouts C1 and C2 are formed so that the cutout C1 of the sheet member P1 constituting the inner layer and the cutout C2 of the sheet metal member P2 constituting the outer layer are aligned with each other when the sheet metal member P1 constituting the inner layer and the sheet metal member P2 constituting the inner layer outer layer, superimposed on each other. Thus, in the waist section forming process S1, portions corresponding to the rear waist section 20 and the front waist section 30 of the diaper 1 are formed.

FIG. 5 and 6, the conveying directions of the elements are indicated by arrows MD, the direction perpendicular to the conveying direction (perpendicular direction) is indicated by the bidirectional arrows CD. In the description below, the conveying direction will be referred to as the MD direction and the perpendicular direction will be referred to as the CD direction.

In the folding process S2 illustrated in FIG. 6, when the sheet member P1 forming the inner layer and the sheet member P2 forming the outer layer, which are superimposed on each other, through the clamping portion N, the end portion outer in the CD direction and corresponding to the front waist section 30 is folded inward. As a result, as illustrated in the enlarged view in FIG. 5, a portion corresponding to the folded portion 320 and a portion corresponding to the overlapped portion 35 are formed. Thus, as illustrated in the enlarged view of FIG. 5, in the process S1 of forming the waist section, the length in the CD direction corresponding to the

8 037912 of its waist section 30 is predetermined to be greater than the length in the CD direction corresponding to the rear waist section 20.

In the moving process S3 of the absorbent main body, a moving operation is performed so that the absorbent main body 10 internally formed with the absorbent core 12 passes between the side corresponding to the rear waist section 20 and the side corresponding to the front waist section 30 spaced apart in the CD direction through the cutouts C1 and C2 as illustrated in FIG. 5. In this case, the moving operation is performed so that the longitudinal direction of the absorbent body 10 is aligned with the direction CD.

In the process S4 for forming the notch in the sheet member P1 forming the inner layer and the sheet member P2 forming the outer layer, an arcuate notch is formed in an inward direction from the edge outward in the CD direction on the side corresponding to the front waist section 30. B as a result, a cutout 40 is formed (see Figs. 1 and 2). In this case, the cutout 40 is formed such that the lowermost end 402 of the cutout 40 is located lower than the upper end 351 of the overlap portion 35 formed by the folding process S2 (see FIGS. 4A and 4C). Thus, in the manufacturing process of the diaper 1, the cutout 40 is formed after the formation of the overlap portion 35 having rigidity in the folding process S2.

In the layering process S5, the side corresponding to the front waist section 30 is folded / folded to bring it into contact with the side corresponding to the rear waist section 20 to reach a position along the MD direction in which they will overlap while the absorbent the main body 10 is bent at a portion central to its longitudinal direction. As a result, the absorbent body 10 will be folded in half.

In the joining process S6, portions corresponding to both side end portions 200 of the rear waist section 20 and portions corresponding to both side end portions 300 of the front waist section 30 are respectively bonded to each other, for example, by heat sealing or ultrasonic welding, in a state in which the side corresponding to the rear waist section 20 and the side corresponding to the front waist section 30 are pulled along the MD direction. As a result, portions are formed corresponding to the two connecting portions 100 (see FIG. 1).

In the process S7, portions corresponding to the two connecting portions 100 formed in the connecting process S6 are cut along the cutting line in the CD direction. The result is a diaper 1 having a multilayer state.

According to an embodiment of the present disclosure, the manufacturing process takes place in the following order: the waist section forming process S1, the folding process S2, the absorbent body moving process S3, the notch forming process S4, the layering process S5, the joining process S6, and the cutting process S7. However, it is not limited to this sequence of processes, for example, the process S3 for moving the absorbent body may follow the process S4 for forming the cutout. In this case, the length of the absorbent body 10 in the longitudinal direction will necessarily be set such that it does not overlap the cut-out area 40.

The manufacturing process of the diaper 1 may not be limited as long as at least the opening forming process 40 (the opening forming process S4) follows the folding process S2 and the joining process S6 follows the opening forming process 40. That is, as the process of increasing the number of layers in the upper end portion 34a of the front waist section 30, the first process relates to the process of forming the portion that corresponds to the folded portion 320, the second process relates to the process of forming the cutout 40, the third process relates to the process of joining, respectively, the portion corresponding to both side end portions 200 of the rear waist section section 20, and a portion corresponding to both side end portions 300 of the front waist section 30. In this case, at least the first to third processes can be performed in this sequence.

Difference from diaper 1A according to comparative example

Next, referring to FIG. 4A-4C and 7A-7C, differences between a diaper 1 according to an embodiment of the present disclosure and a diaper 1A according to a comparative example will be described.

FIG. 7A to 7C are explanatory schematic views illustrating the diaper 1A of the comparative example. FIG. 7A is an explanatory plan view illustrating the state of the side of the front waist section 30A at the time of manufacture. FIG. 7B is a cross-sectional view illustrating the front waist section 30A of the diaper 1A. FIG. 7C is an explanatory plan view illustrating the state of the connecting portion 100A. It should be noted that in FIG. 7A-7C, for simplicity, a plurality of elastic members 33 are not illustrated.

As illustrated in FIG. 7B, the front waist section 30A of the comparative diaper 1A does not have a folded portion unlike the front waist section 30 of the diaper 1 of the embodiment of the present disclosure. That is, the upper end portion of the sheet 32 forming the outer layer is not folded downward. Thus, as illustrated in FIG. 7B, the number of layers in the front waist section 30A is set to two in the entire region from the end 302, the lowest vertically

9 037912 in the direction of the uppermost end 301, the rigidity of the front waist section 30A is lower than the rigidity of the overlap portion 35 in the front waist section 30 of the diaper 1 according to an embodiment of the present disclosure over the entire area of the front waist section 30A.

If, in this case, in the connecting process S6 (see FIG. 5), the part corresponding to both side end portions 200 of the rear waist section 20 and the portion corresponding to both side end portions 300 of the front waist section 30 are connected to each other in a state of in which the side corresponding to the front waist section 30A is stretched in the lateral direction (in the direction along the MD direction) as illustrated in FIG. 7A, the upper end portion 34a formed discontinuous due to the cutout 40 is attached in a state in which it is curled downwardly (to the absorbent body 10). As illustrated in FIG. 7C, misalignment may occur in the two connecting portions 100A. It should be noted that FIG. 7C illustrates a case in which displacement occurs in only one of the two connecting portions 100A by way of example.

However, since in the diaper 1 according to the embodiment of the present disclosure, the front waist section 30 has an overlap portion 35 having three layers on the side higher in the vertical direction than the lower end 402 of the cutout 40, as described above (see FIG. 4B and 4C), the rigidity of the overlap portion 35 becomes higher than that of the upper end portion 34a of the front waist section 30A according to the comparative example. Accordingly, in the connecting process S6, even when the portion corresponding to both side end portions 200 of the rear waist section 20 and the portion corresponding to both side end portions 300 of the front waist section 30 are connected to each other in a state in which the side corresponding to the front waist section of the section 30 is stretched in the lateral direction (in the direction along the MD direction), that is, the plurality of elastic members 33 are stretched, the upper end portion 34a is less likely to curl downward, whereby it is possible to prevent displacement in the two connecting portions 100.

In the method for manufacturing a diaper 1, a cutout 40 is formed in a cutout forming process S4 in a state in which the number of layers of the upper end portion 34a of the front waist section 30 is increased in a folding process S2 (to form a portion that corresponds to a folded portion 320) to increase rigidity, and then the manufacturing process proceeds to the joining process S6. Thus, the portion corresponding to the upper end portion 34a of the front waist section 30 is less likely to twist in the joining process S6, whereby it is possible to prevent displacement in the two joining portions 100.

Since, according to an embodiment of the present disclosure, the lower end 352 of the overlap portion 35 is located lower in the vertical direction than the lower end 402 of the cutout 40, furthermore, lower in the vertical direction than the upper end 101 of the absorbent body 10, as described above (see FIG. 4A-4C), the overlapping portion 35 is formed in an area wider in the vertical direction. Thus, the portion having high rigidity is increased. For this reason, even when an operation of correspondingly joining both side end portions 200 of the rear waist section 20 and both side end portions 300 of the front waist section 30 to each other is performed in a state in which the front waist section 30 is pulled laterally, end portion 34a downward.

According to an embodiment of the present disclosure, an overlap portion 35 is formed in the entire region from the edge 401 of the cutout 40 to both side end portions 300 of the front waist section 30, at least on a side higher in the vertical direction than the lower end 402 of the cutout 40 ( see Fig. 4A) as described above, and therefore stiffness increases in the entire area in the lateral direction on both lateral sides of the cutout 40. It should be noted that the overlap portion 35 is not necessarily formed in the entire area from the edge 401 to both lateral end portions 300 the front waist section 30. Instead, an overlap portion 35 may be provided in a portion of the regions located on both sides of the cutout 40.

In addition, since elastic members 33 having stiffness are provided on both sides of the cutout 40 in a region located in the vertical direction higher than the lower end 402 of the cutout 40 and overlap with the overlapping portion 35 (see FIG. 4A), the stiffness rises in the upper end portion 34a of the front waist section 30. Thus, the likelihood of the upper end portion 34a being twisted downward is further reduced even when both side end portions 200 of the rear waist section 20 and both side end portions 300 of the front waist section 30 are connected in a state of in which the front waist section 30 is pulled laterally. It should be noted that the elastic members 33 do not necessarily overlap the overlap portion 35.

First modification

Next, referring to FIG. 8A to 8C, the configuration of the diaper 1B according to the first modification will be described.

FIG. 8A to 8C are explanatory schematic views illustrating the front waist section 30B of the diaper 1B according to the first modification. FIG. 8A is an explanatory plan view illustrating the area around the front waist section 30B in the unfolded

- 10 037912 and stretched condition. FIG. 8B is a cross-sectional view taken along line VUIB-VUIB in FIG. 8A. FIG. 8C is a sectional view taken along line VIIIC-VIIIC in FIG. 8C. FIG. 8A to 8C, elements the same as those in the diaper 1 of the first embodiment are given the same reference numerals and descriptions thereof are omitted. The same holds true for the second modification (FIGS. 9A-9C) and the second embodiment (FIGS. 10A-10C and FIG. 11).

In the diaper 1B of this modification, the vertical length of the overlap portion 35B is smaller than the vertical length of the overlap 35 in the diaper 1 of the first embodiment. That is, the amount of the folded portion of the upper end portion of the outer layer sheet 32 in the front waist section 30B is less than that of the folded portion in the diaper 1 according to the first embodiment, and the vertically determined length of the folded portion 320B is less than the vertically determined length of the folded parts 320 of the diaper 1 according to the first embodiment.

Specifically, as illustrated in FIG. 8A, the lower end 352 of the overlap portion 35B is vertically higher than the lower end 402 of the cutout 40. Thus, the overlap portion 35B is not vertically lower than the lower end 402 of the cutout 40, as illustrated in FIG. 8B, but the overlap portion 35B is formed laterally on each side of the cutout 40 as illustrated in FIG. 8A and 8C. It should be noted that in FIG. 8A, the limits that correspond to the overlapped portion 35B are shown in bold lines.

Even in this case, the overlapped portion 35 having a stiffness that exceeds that of the lower end portion 34b is made higher in the vertical direction than the lower end 402 of the cutout 40 of the front waist section 30B. Thus, even when both side end portions 200 of the rear waist section 20 and both side end portions 300 of the front waist section 30B are respectively connected to each other in a state in which the front waist section 30B is pulled in the lateral direction (in the direction along the MD direction), that is, in a state in which a plurality of elastic members 33 are stretched, the upper end portion 34a is less curled downward, whereby it is possible to prevent displacement in the two joint portions 100.

Thus, unlike the diaper 1 of the first embodiment, the lower end 352 of the overlap portion is not necessarily located lower in the vertical direction than the lower end 402 of the cutout 40. Instead, at least the overlap portion 35 may be provided vertically higher than lower end 402 of cut 40.

Second modification

Next, referring to FIG. 9A to 9C, the configuration of the diaper 1C according to the second modification will be described.

FIG. 9A to 9C are explanatory schematic views illustrating the front waist section 30C of the diaper 1C according to the second modification. FIG. 9A is an explanatory plan view illustrating the area around the front waist section 30C in the unfolded and stretched state. FIG. 9B is a sectional view taken along line IXB-IXB in FIG. 9A. FIG. 9C is a sectional view taken along line IXC-IXC in FIG. 9A.

In the diaper 1C according to this modification, the vertically determined length of the overlapped portion 35C is greater than the vertically determined length of the overlapping portion 35 in the diaper 1 according to the first embodiment. In particular, the amount of the folded portion of the upper end portion of the outer layer sheet 32 in the front waist section 30C is larger than the amount of the folded portion in the diaper 1 according to the first embodiment, the vertically determined length of the folded portion 320C is greater than the vertically determined length of the folded parts 320 of the diaper 1 according to the first embodiment.

Accordingly, as illustrated in FIG. 9A, the lower end 352 of the overlap portion 35C is positioned lower in the vertical direction than the upper end 121 of the absorbent core 12 of the absorbent body 10, and the overlap portion 35C overlaps with the absorbent core 12 in the thickness direction, as illustrated in FIG. 9B. However, as illustrated in FIG. 9A, the overlap portion 35C is not formed in the lower end portion 34b of the front waist section 30C, two layers are formed in the lower end portion 34b according to this modification.

Since, in this case, the overlapping portion 35C extends to a point where the overlapping portion 35C overlaps with the absorbent core 12 having a certain thickness, the high rigidity portion further increases in the vertical direction. Thus, even when both side end portions 200 of the rear waist section 20 and both side end portions 300 of the front waist section 30C are respectively connected to each other in a state in which the front waist section 30C is pulled in the lateral direction (in the direction along the MD direction), that is, in a state in which the plurality of elastic members 33 are stretched, the upper end portion 34a curls less downwardly, whereby it is possible to further prevent displacement in the two joint portions 100.

- 11 037912

Second embodiment

Next, referring to FIG. 10A-10C and 11, a diaper 1D according to a second embodiment of the disclosure will be described.

FIG. 10A to 10C are explanatory schematic views illustrating the front waist section 30D of the diaper 1D according to the second embodiment. FIG. 10A is an explanatory plan view illustrating the area around the front waist section 30D in the unfolded and stretched state. FIG. 10B is a cross-sectional view taken along line XB-XB in FIG. 10A. FIG. 10C is a cross-sectional view taken along line XCXC in FIG. 10A. FIG. 11 is an explanatory diagram illustrating an overlap process S20 in a manufacturing process of the diaper 1D according to the second embodiment.

Unlike the configuration of the overlapped portion 35 in the diaper 1 according to the first embodiment, the diaper 1D according to the second embodiment does not have a folded portion, the overlapping portion 35D is formed by a separate sheet 36 as a sheet member different from the sheet member of the lower end portion 34b of the front waistband. section 30D (inner layer sheet 31 and outer layer sheet 32) as illustrated in FIG. 10C.

In the manufacturing process of the diaper 1D according to the embodiment of the present disclosure, the overlapped portion 35D is formed by the overlapping process S20 instead of the folding process S2 in the manufacturing process of the diaper 1 of the first embodiment. Specifically, after the waist section forming process S1 (see Fig. 5), a sheet member (separate sheet 36) other than the sheet member P1 forming the inner layer and the sheet member P2 forming the outer layer are applied so that the end portion, outer in the CD direction was on the side corresponding to the front waist section 30D in the overlapping process S20 as illustrated in FIG. 11. As a result, the overlapped portion 35D is formed with a number of plies that is greater than the plies of the lower end portion 34b.

Thus, the overlapped portion 35D is formed by placing a separate sheet 36 other than the inner layer sheet 31 and the outer layer sheet 32, which form the lower end portion 34b of the front waist section 30D, at least on the side located vertically higher than the lower end 402 of the cutout 40. Accordingly, it is possible to make the ID diaper without the need for a complicated process, for example, in contrast to the case where the overlap portion 35 is formed by folding the upper end portion of the sheet 32 forming the outer layer, as in the diaper 1 according to the first embodiment.

According to an embodiment of the present disclosure, a separate sheet 36 is provided on the skin-facing side of the inner-layer sheet 31 in the thickness direction and on the non-skin side of the absorbent body 10, as illustrated in FIG. 10B. Not intended to be limited thereto, a separate sheet 36 can be provided, for example, on the skin-facing side of the absorbent main body 10 so that it covers a part of the other end side 10b of the absorbent main body 10. In this case, it is also possible to prevent the discomfort that can be caused by wearing, by reducing the thickness between the absorbent body 10 and the front waist section 30D.

More examples

The above embodiments have been described to provide an easy understanding of the present disclosure and should not be construed in a limiting sense. Various changes and modifications may be possible without departing from the spirit and scope of the disclosure of the invention, of course, covering its equivalents.

Although a so-called three-piece diaper including three separate components has been described in the above embodiments by way of example, the invention is not limited thereto. The disclosure of the invention can also be applied to a diaper formed such that the back waist section, the front waist section and the absorbent main body are integrally integrated, both side end portions of the back waist section and both side end portions of the front waist section are respectively connected to each other, unless limited thereto.

Although the description has been made on the assumption that the diaper is intended to be worn by a newborn infant in the above embodiments, the invention is not limited thereto. A child who is older than a newborn infant, or an adult such as an elderly person, may also wear a diaper.

Although the description has been made on the assumption that the upper end 351 of the overlap portion 35 is located lower in the vertical direction than the uppermost end 301 of the waist section 30, 30B, 30C, or 30D in the above embodiments, the invention is not limited thereto. The upper end 351 of the overlap portion 35 may also be disposed vertically at the uppermost end 301.

Although the number of layers in the lower end portion 34b of the front waist section 30 is set

12 037912 to be two and the number of layers in the overlapping portion 35 is set to three in the above embodiments, the invention is not limited thereto. The number of layers is not particularly limited.

Although the overlap portion 35 is formed in the front waist section 30 in the above embodiments, it is not limited to the front waist section 30. The overlapped portion 35 may also be formed in the rear waist section 20.

List of reference numbers 1B, 1C, 1D — diaper (disposable diaper);

- absorbent main body;

- absorbent core;

- back waist section;

- front waist section;

- sheet forming the inner layer (sheet element);

- sheet forming the outer layer (sheet element);

- elastic element;

a - upper end part 34b lower end part;

- a part with overlapping (a part in which the number of layers is greater than the number of layers in the lower end part);

- a separate sheet;

- cutout;

101 — upper end of the absorbent body;

121 - the upper end of the absorbent core;

200, 300 - both ends;

300a - one end part;

300b is the other end;

301 — The uppermost end of the front waist section;

320, 320V, 320C - bent part;

351 — Upper end of part with overlapping;

401 — cutout edge;

402 — lower end of the cutout;

S2 - folding process (first process);

S4 - the process of forming the notch (second process);

S6 - connection process (third process) /

Claims (8)

CLAIM 1. A disposable diaper (1) having a vertical direction and a lateral direction intersecting with the vertical direction, the disposable diaper comprising an absorbent main body (10) for absorbing secretions; a rear waist section (20) located on the side (10a) of one end of the absorbent main body; and a front waist section (30) located on the side (10b) of the other end of the absorbent main body, where both side end portions (200) of the rear waist section and both side end portions (300) of the front waist section are respectively connected to each other, in of the laterally central part of the vertically upper end part (34a) of the front waist section, a cutout (40) is made, and a portion (35) is provided in which the number of plies is greater than the number of plies in the vertically lower end portion (34b) of the front waist section , and the upper end (351) of which is located higher in the vertical direction than the lower end (402) of the cutout (40) of the front waist section, wherein the front waist section (30) includes a sheet member, said portion (35) in which the number of layers is greater than the number of layers in the lower end portion of the front waist section, made with a sheet member (36) separate from the sheet metal member forming the lower end portion (34b), wherein the upper end (351) of said portion (35), in which the number of plies is greater than the number of plies in the lower end portion (34b) of the front waist section, is positioned lower in the vertical direction than the uppermost end (301) of the front waist section. 2. A disposable diaper according to claim 1, wherein said portion (35), in which the number of layers is greater than the number of layers in the lower end portion (34b) of the front waist section, is provided over the entire area from the edge of said cutout to both side ends of the front waist section. sections in the lateral direction. 3. A disposable diaper according to claim 1 or 2, wherein the lower end (352) of said portion (35), in which the number of layers is greater than the number of layers in the lower - 13 037912 of the end part (34b) of the front waist section is located lower in the vertical direction than the lower end (402) of the said cutout. 4. A disposable diaper according to claim 3, wherein the lower end (352) of said portion (35), in which the number of layers is greater than the number of layers in the lower end portion (34b) of the front waist section, is located lower in the vertical direction than the upper end ( 101) Absorbent main body. 5. A disposable diaper according to claim 4, wherein the absorbent main body (10) includes an absorbent core (12), and a lower end (352) of said portion (35), wherein the number of layers is greater than the number of layers in the lower end part ( 34b) of the front waist section is located lower in the vertical direction than the upper end (121) of the absorbent core. 6. A disposable diaper according to any one of claims 1-5, wherein the front waist section (30) includes an elastic member (33) located on each side of the cutout (40) and higher in the vertical direction than the lower end of the cutout, while the elastic element is made with the possibility of stretching and contracting in the lateral direction. 7. A disposable diaper according to claim 6, wherein an elastic member (33) is provided in said portion (35), wherein the number of layers is greater than the number of layers in the lower end portion of the front waist section. 8. A method of manufacturing a disposable diaper according to any one of claims 1 to 7, the method comprising a first process of increasing the number of layers on the side located higher than the vertically lower end portion of the front waist section (30); a second process of forming a notch (40) in the lateral center portion of the vertically upper end portion of the front waist section after the first process; and a third process of correspondingly joining both side end portions (200) of the rear waist section (20) and both side end portions (300) of the front waist section (30) with each other after the second process, wherein in the second process the cutout (40) is formed as so that the lowermost end (402) of the cutout is located lower than the upper end (351) of the more layer portion (35) that is formed in the first process.