JP6469038B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

  Conventionally, as a disposable diaper, a disposable diaper having a pants shape in which one waist opening and a pair of leg openings are formed is known. For example, Patent Document 1 includes a ventral waist part (front body), a crotch part, and a dorsal waist part (rear body), and corresponding end portions (side edge portions) of the ventral waist part and the back waist part. ), A disposable diaper including an exterior body in which a pair of joint portions (side edge joint portions) is formed and an absorbent main body disposed inside the exterior body is disclosed. Among the disposable diapers, in FIG. 3A, FIG. 3B, and FIG. 3C, the upper end edge of the abdominal waistline portion has a downward convex shape by the cut portion formed at the center of the upper end portion of the abdominal waistline portion. Has been proposed.

JP 2012-192115 A

  In the disposable diaper having a cut portion at the center of the upper end portion of the abdominal side waist portion, the upper end portion of the abdominal side waist portion is formed discontinuously in the lateral direction by the cut portion. When both the lateral ends of the abdominal waistline and the lateral ends of the dorsal waistline are joined in a state where the waistline is pulled laterally, the lateral portions of the cut portion are located on both sides in the lateral direction. There is a possibility that the upper end portion is joined in a downward direction, that is, in a state where the upper end portion is turned back to the crotch side of the wearer, and a deviation occurs in the joined portion.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to join the lateral ends of the abdominal waistline and the lateral ends of the back waistline. It is providing the disposable diaper which can suppress generation | occurrence | production of the shift | offset | difference in a part.

The main invention for achieving the above object is:
A longitudinal direction and a transverse direction intersecting the longitudinal direction,
An absorbent body that absorbs excreta;
A back waistline portion located on one end side of the absorbent main body,
A ventral waist part located on the other end side of the absorbent main body,
The both lateral ends of the back waistline and the lateral ends of the ventral waist are joined disposable diapers, respectively.
The central portion of the ventral side waistline portion in the lateral direction, the upper end portion of the ventral side waistline portion in the longitudinal direction is provided with a cut portion,
On the upper side of the lower end of the cut part in the longitudinal direction of the ventral side waist part, it has a portion with a larger number of layers than the lower end part in the longitudinal direction of the ventral side waist part ,
The ventral waist part has a sheet member,
In the portion where the number of stacked layers is larger than the lower end portion of the ventral side waist portion, a sheet member different from the sheet member constituting the lower end portion is provided,
The disposable diaper is characterized in that an upper end of a portion where the number of stacked layers is larger than that of the lower end portion of the abdominal waistline portion is located below the uppermost end of the abdominal waistline portion in the longitudinal direction. .
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the shift | offset | difference in the junction part of the both ends of the horizontal direction of a ventral side waist part and the both ends of the horizontal direction of a back side waist part can be suppressed.

It is a schematic perspective view which shows one structural example of the diaper which concerns on 1st Embodiment of this invention. It is the general | schematic top view which looked at the diaper of an expansion | deployment and the expansion | extension state from the wearer's skin side. It is the III-III sectional view taken on the line of FIG. FIG. 4A is an explanatory view for explaining the ventral waist part, FIG. 4A is a plan explanatory view showing the periphery of the abdomen waist part in the expanded and extended state, FIG. 4B is a sectional view taken along the line IVB-IVB in FIG. 4A, and FIG. It is an IVC-IVC line sectional view. It is explanatory drawing explaining the manufacturing process of a diaper. It is explanatory drawing explaining the folding | turning process among the manufacturing processes of a diaper. It is explanatory drawing explaining the diaper which concerns on a comparative example, FIG. 7A is plane explanatory drawing explaining the state by the side of the stomach side waist part at the time of manufacture, FIG. 7B is sectional drawing of the stomach side waist part of a diaper, FIG. It is plane explanatory drawing explaining the state of a part. It is explanatory drawing explaining the ventral side waist part of the diaper which concerns on the modification 1, FIG. 8A is plane explanatory drawing which shows the abdominal side waist part periphery of the expansion | deployment state of the expansion | extension state, FIG. 8B is a VIIIB-VIIIB sectional view taken on the line VIIIB-VIIIB of FIG. 8C is a sectional view taken along line VIIIC-VIIIC in FIG. 8A. It is explanatory drawing explaining the ventral side waist part of the diaper which concerns on the modification 2, FIG. 9A is a plane explanatory view which shows the abdominal side waist part periphery of the expansion | deployment and expansion | extension state, FIG. 9B is IXB-IXB sectional view taken on the line of FIG. 9C is a sectional view taken along line IXC-IXC in FIG. 9A. It is explanatory drawing explaining the ventral side waist part of the diaper which concerns on 2nd Embodiment of this invention, FIG. 10A is plane | planar explanatory drawing which shows the abdominal side waist part periphery of the unfolding and expansion | extension state, FIG. 10B is XB- of FIG. FIG. 10C is a cross-sectional view taken along line XB and FIG. 10C is a cross-sectional view taken along line IVC-IVC in FIG. 10A. It is explanatory drawing explaining a superimposition process among the manufacturing processes of the diaper which concerns on 2nd Embodiment.

  At least the following matters will become apparent from the description of the present specification and the accompanying drawings.

  An absorptive body having a longitudinal direction and a transverse direction intersecting with the longitudinal direction and absorbing excrement; a back waistline portion located on one end side of the absorptive body; and the other absorptive body A disposable diaper comprising: an abdominal waistline portion located on an end side; and both lateral end portions of the dorsal waistline portion and the lateral end portions of the abdominal waistline portion joined respectively. A central portion of the abdominal waistline portion in the lateral direction, a cut portion is provided at an upper end portion of the abdominal waistline portion in the longitudinal direction, and the longitudinal direction of the ventral waistline portion in the longitudinal direction A disposable diaper having a portion having a larger number of layers than the lower end portion in the longitudinal direction of the abdominal waistline portion above the lower end of the cut portion becomes clear.

  According to such a disposable diaper, in the ventral side waist part, on both sides of the cut part in the lateral direction, by having a portion having a larger number of layers than the number of layers in the lower end, the rigidity in that portion is increased, When the abdominal waistline is pulled in the horizontal direction, both the lateral ends of the abdominal waistline and the lateral ends of the backside waistline are joined to each other, so that the upper end is less likely to bend down. In addition, it is possible to suppress the occurrence of deviation at the joint between the lateral end portions of the abdominal waistline portion and the lateral end portions of the back side waistline portion.

  In such a disposable diaper, a portion having a larger number of layers than the lower end portion of the abdominal waistline portion extends from the edge of the cut portion in the lateral direction to both lateral ends of the abdominal waistline portion. It is desirable to be provided.

  According to such a disposable diaper, on both sides of the cut portion in the lateral direction of the abdominal waistline portion, the number of laminated layers is larger than the number of layers in the lower end portion from the edge of the cut portion to both lateral ends of the abdominal waistline portion. By having a large number of parts, the overall rigidity in the lateral direction increases, so the lateral side of the abdominal waistline and the lateral side of the backside waistline with the abdominal waistline pulled in the lateral direction When joining the both ends of each, the upper end part of the abdominal side waist part becomes difficult to bend down more downward.

  In this disposable diaper, it is desirable that the position of the lower end of the portion where the number of stacked layers is larger than that of the lower end portion of the abdominal side waist portion be lower than the lower end of the cut portion in the longitudinal direction.

  According to such a disposable diaper, in the ventral side waist part, the portion where the number of layers is larger than the number of layers at the lower end is provided below the lower end of the cut portion, so the portion having high rigidity in the vertical direction The upper end of the abdominal waistline when joining the both lateral ends of the abdominal waistline and the lateral ends of the dorsal waistline with the ventral waistline pulled laterally Is more difficult to roll down.

  In such a disposable diaper, it is desirable that the position of the lower end of the portion where the number of stacked layers is larger than that of the lower end portion of the abdominal side waist portion be lower than the upper end of the absorbent main body in the longitudinal direction.

  According to such a disposable diaper, in the ventral side waistline portion, since the portion where the number of stacked layers is larger than the number of stacked layers in the lower end portion is provided up to the position where it overlaps the absorbent main body, the portion with higher rigidity in the vertical direction is more The upper end of the abdominal waistline is increased when joining both the lateral ends of the abdominal waistline and the lateral ends of the backside waistline while the abdomen waistline is pulled laterally. It becomes harder to turn downward.

  In this disposable diaper, the absorbent main body has an absorbent core therein, and the position of the lower end of the portion where the number of stacked layers is larger than the lower end portion of the ventral waistline portion is the absorption in the longitudinal direction. It is desirable to be below the upper end of the sex core.

  According to such a disposable diaper, in the ventral side waist part, since the portion where the number of stacked layers is larger than the number of stacked layers in the lower end portion is provided up to the position overlapping the absorbent core having rigidity, the rigidity in the vertical direction is high. When joining the both lateral ends of the abdominal waistline and the lateral ends of the dorsal waistline in a state where the portion is further increased and the abdominal waistline is pulled laterally, The upper end portion is less likely to bend downward.

  In this disposable diaper, the belly side waistline portion has a sheet member, and the upper end portion in the longitudinal direction of the sheet member is below the portion where the number of stacked sheets is larger than the lower end portion of the belly side waistline portion. It is desirable to have a folded portion folded back.

  According to such a disposable diaper, since the upper end portion of the sheet member of the abdominal side waistline portion is folded downward, the folded portion forms a portion having a larger number of layers than the lower end portion of the abdominal side waistline portion. There is no need to separately provide a sheet member for increasing the number of sheets, and the number of members can be reduced.

  In such a disposable diaper, the abdomen waistline portion has a sheet member, and in the portion where the number of stacked layers is larger than the lower end portion of the abdomen waistline portion, the sheet member constituting the lower end portion is It is desirable that different sheet members are provided.

  According to such a disposable diaper, by stacking another sheet member in addition to the sheet member constituting the lower end portion of the abdominal waistline portion, a portion having a larger number of layers than the lower end portion of the abdominal waistline portion is formed. Therefore, for example, it can manufacture without requiring a complicated process compared with the case where a sheet member is folded and the portion concerned is formed.

  In such a disposable diaper, the upper end of the portion where the number of stacked layers is larger than the lower end portion of the abdominal waistline portion is located below the vertical direction from the uppermost end of the abdominal waistline portion. desirable.

  According to such a disposable diaper, the upper end of the portion where the number of stacked layers is larger than the lower end of the abdominal waistline is located below the uppermost end of the abdominal waistline in the vertical direction. Since the upper end portion of the side waistline portion does not have a portion where the number of laminated layers is larger than that of the lower end portion of the abdominal side waistline portion, the rigidity is lowered near the waistline opening, and the touch is soft and good.

  In this disposable diaper, the ventral waist part is an elastic member that expands and contracts in the lateral direction on both sides of the cut part in the lateral direction and above the lower end of the cut part in the longitudinal direction. It is desirable to have.

  According to such a disposable diaper, the abdomen waist part has an elastic member having rigidity on both sides of the cut part in the lateral direction and above the lower end of the cut part in the longitudinal direction, so that the upper end of the abdomen waist part When joining the both lateral ends of the ventral waistline and the lateral ends of the dorsal waistline in a state in which the rigidity is increased and the ventral waistline is pulled laterally, The upper end of the roll is less likely to roll downward.

  In such a disposable diaper, it is desirable that the elastic member is provided in a portion where the number of stacked layers is larger than that of the lower end portion of the ventral waist portion.

  According to such a disposable diaper, since the elastic member having rigidity is provided in a portion where the number of laminated layers is larger than the lower end portion of the abdominal waistline portion, the rigidity in the portion becomes higher. When joining the lateral ends of the abdominal waistline and the lateral ends of the dorsal waistline while the waistline is pulled laterally, the upper end of the abdominal waistline is more downward. It becomes difficult to drown.

  An absorptive body having a longitudinal direction and a transverse direction intersecting with the longitudinal direction and absorbing excrement; a back waistline portion located on one end side of the absorptive body; and the other absorptive body A disposable diaper manufacturing method comprising a ventral waistline portion located on an end side, the first step of increasing the number of stacked layers above the lower end in the longitudinal direction of the ventral waistline portion; After the first step, a second step of forming a cut portion at a central portion of the ventral waistline portion in the lateral direction and an upper end portion of the ventral waistline portion in the vertical direction, and the second step A third step of joining the lateral end portions of the dorsal waistline portion and the lateral end portions of the ventral waistline portion, respectively, and in the second step, The lowermost end of the cut part is a laminate formed in the first step. Method for manufacturing a disposable diaper to form the cut portion so that the lower side than the upper end of the large number portion becomes apparent.

  According to such a disposable diaper manufacturing method, in a state where the number of layers is increased and the rigidity is increased on the upper side of the lower end portion of the abdominal waistline portion, the cut portion is formed, and the lateral side of the back waistline portion is formed. Since both end portions and both end portions in the lateral direction of the abdominal waistline portion are joined, the upper end portion of the abdominal waistline portion is less likely to turn downward during the joining, and both lateral end portions of the abdominal waistline portion It is possible to suppress the occurrence of misalignment at the joint between the lateral end portions of the back side waistline portion and the back side waistline portion.

=== First Embodiment ===
As an example of the disposable diaper 1 (hereinafter simply referred to as diaper 1) according to the first embodiment of the present invention, a pant-type disposable diaper mainly intended for wearing a newborn will be described.

<Configuration of diaper 1>
First, the structure of the diaper 1 is demonstrated with reference to FIGS. 1-3.

  FIG. 1 is a schematic perspective view showing a configuration example of the diaper 1. FIG. 2 is a schematic plan view of the developed and extended diaper 1 as viewed from the skin side of the wearer. 3 is a cross-sectional view taken along line III-III in FIG.

  The diaper 1 has a “vertical direction” as shown in FIG. 1 and a “lateral direction” that intersects the vertical direction, and also has a “thickness direction” as shown in FIG. Of the longitudinal direction, the torso side of the wearer is referred to as “upper side”, and the inseam side of the wearer is referred to as “lower side”. Further, in the state where the wearer wears the diaper 1, the side positioned on the wearer's belly side is simply referred to as “belly side”, and the side positioned on the wearer's back side is simply referred to as “back side”. The “thickness direction” is a direction in which the respective members constituting the diaper 1 are stacked, and the side in contact with the wearer's skin when the wearer wears the diaper 1 is defined as “skin side”, and the opposite side. Is “non-skin side”.

  As shown in FIG. 1, the diaper 1 includes a band-shaped absorbent main body 10, a back waistline portion 20 located on the back side of the wearer, and a ventral side waistline portion 30 located on the abdomen side of the wearer. The so-called three-piece type provided.

  As shown in FIG. 2, in the unfolded diaper 1, the back waistline portion 20 is located on one end side 10 a in the longitudinal direction of the absorbent main body 10, and the ventral side is located on the other end side 10 b in the longitudinal direction of the absorbent main body 10. The waist part 30 is located. That is, the absorptive main body 10 is bridged between the back side waistline part 20 and the abdominal side waistline part 30 which are arrange | positioned at intervals.

  In the diaper 1, the absorbent main body 10 is folded in half at the center in the longitudinal direction so that the uppermost end 201 of the back waistline portion 20 and the uppermost end 301 of the abdominal waistline portion 30 are aligned. By joining the both ends 200 in the lateral direction and the both ends 300 in the lateral direction of the abdominal waistline 30, one waistline opening 1HB and two leghole openings 1HL are formed, and the pants-type diaper (See FIG. 1). Thus, the both ends 200 in the lateral direction of the back waistline portion 20 and the both ends 300 in the lateral direction of the abdominal waistline portion 30 are joined together to form a pair of joint portions 100 shown in FIG. .

  The back-side waistline portion 20 and the abdomen-side waistline portion 30 are provided with a plurality of elastic members along the lateral direction, and when the diaper 1 is worn, the plurality of elastic members contract in the lateral direction to cause the wearer's wear. The dorsal waist and abdomen are tightened to improve fit. In the unfolded state shown in FIG. 2, the diaper 1 is in an extended state. Here, the “extended state” means that a plurality of elastic members of the back side waistline part 20 and the abdominal side waistline part 30 are extended in the lateral direction so that the back side waistline part 20 and the abdominal side waistline part 30 are laterally extended. It means a state where it is stretched without wrinkles. More specifically, the lateral dimensions of the back waistline portion 20 are the same as the lateral dimensions of the sheet members forming the backside waistline portion 20 until the length is close to the dimensions of these sheet members. And the lateral dimension of the ventral waist part 30 is the same as the lateral dimension of the sheet member forming the ventral waist part 30 or a length close to the dimensions of these sheet members. The state extended in the horizontal direction until it becomes.

  The absorbent main body 10 is a member that is applied to the wearer's crotch portion and absorbs excrement such as urine. As shown in FIG. 3, the top sheet 11 disposed on the skin side and the non-skin side While having the back sheet 13 arrange | positioned, the absorptive core 12 arrange | positioned between the top sheet 11 and the back sheet 13, and the exterior sheet | seat 14 arrange | positioned on the non-skin side rather than the back sheet 13, As shown in FIG. 2, side sheets 15 are further provided on both sides in the lateral direction.

  The top sheet 11 is a liquid-permeable sheet member such as a nonwoven fabric, and the back sheet 13 is a liquid-impermeable sheet member such as polyethylene or polypropylene. The absorbent core 12 is formed by laminating liquid absorbent materials such as pulp fibers and superabsorbent polymers. In addition, the absorptive core 12 may be coat | covered with what is called a core wrap which is liquid permeable sheet members, such as a nonwoven fabric and a tissue, for example. The exterior sheet 14 is a soft sheet member such as a nonwoven fabric.

  The side sheet 15 is a leak-proof sheet member obtained by processing a non-woven fabric or the like, for example. As shown in FIG. 2, an elastic member 151 that expands and contracts along the longitudinal direction of the absorbent main body 10 is provided at the laterally outer end of the side seat 15. Thereby, the both sides of the horizontal direction of the absorptive main body 10 can comprise so-called leg gathers LG, and can be made to fit a wearer's leg periphery. For the elastic member 151, for example, rubber thread or an elastic sheet can be used. In FIG. 2, the elastic member 151 is indicated by a one-dot chain line.

  On the other hand, the laterally inner end of the side seat 15 is folded toward the laterally outer side, and an elastic member (not shown) that expands and contracts along the longitudinal direction of the absorbent main body 10 is folded on the folded part. Is provided. Thereby, the edge part of the horizontal direction inner side of the side seat | sheet 15 can comprise the so-called solid gather LSG which can stand on the skin side, and can hold up excrement.

  As shown in FIG. 2, the back waistline portion 20 has a rectangular shape having long sides in the lateral direction in plan view, and as shown in FIG. 3, an inner layer sheet 21 disposed on the skin side, and a non-skin side And an outer layer sheet 22 arranged in the horizontal direction and a plurality of elastic members 23 that expand and contract in the lateral direction. Inner layer sheet 21 and outer layer sheet 22 are sheet members, such as a nonwoven fabric, for example.

  The plurality of elastic members 23 are arranged side by side in the longitudinal direction between the inner layer sheet 21 and the outer layer sheet 22 and are fixed to the inner layer sheet 21 and the outer layer sheet 22 in a state of being stretched along the lateral direction. ing. In the present embodiment, a plurality of thread rubbers are used as the plurality of elastic members 23. However, it is not always necessary to use a plurality of thread rubbers. For example, thread-like polyurethane stretchable fibers or sheet-like elastic members may be used. . 1 and 2, the plurality of elastic members 23 are indicated by broken lines.

  As shown in FIG. 2, the elastic member 23 disposed above the absorbent core 12 in the vertical direction is provided continuously from one end to the other end in the horizontal direction. The elastic member 23 arranged at the overlapping position has a discontinuous portion on the absorbent core 12. As described above, the elastic member 23 has a discontinuous portion on the absorbent core 12, so that the absorbent core 12 is prevented from excessively contracting in the lateral direction on the back side, and the absorbent core 12 is separated from the gap. It can be closely attached to the wearer's back and leads to suppression of excrement leakage.

  As shown in FIG. 2, the ventral waist part 30 has a rectangular shape having long sides in the lateral direction in plan view, and as shown in FIG. 3, the inner layer sheet 31 disposed on the skin side and the non-skin side And the plurality of elastic members 33 extending and contracting in the lateral direction. The inner layer sheet 31 and the outer layer sheet 32 are sheet members, such as a nonwoven fabric, for example. In the present embodiment, the ventral waist part 30 has a folded portion 320 in which the upper end portion in the longitudinal direction of the outer layer sheet 32 is folded downward. As shown in FIG. 3, the folded portion 320 is provided on the skin side of the inner layer sheet 31 in the thickness direction and on the non-skin side of the absorbent main body 10. The folding unit 320 will be described in detail later.

  As shown in FIGS. 1 and 2, the ventral waist part 30 has a cut portion 40 that is cut out in a circular arc shape downward from the uppermost end 301 at the central portion in the horizontal direction and the upper end portion 34 a in the vertical direction. have. Therefore, the “upper end portion 34 a” indicates a portion between the lowermost end 402 of the cut portion 40 and the uppermost end 301 of the ventral side waistline portion 30 in the longitudinal direction of the ventral side waistline portion 30. In the present embodiment, the cut portion 40 has an arc shape that protrudes downward. However, the cut portion 40 does not necessarily have an arc shape, and may be, for example, a rectangular shape. In this case, the cut portion 40 is formed by a straight line. Therefore, design becomes easy. Further, for example, it may be a linear slit having a predetermined length in the vertical direction. In this case, the manufacturing is facilitated and a cut-off portion is not generated during the manufacturing. In FIG. 3, portions of the inner layer sheet 31 and the outer layer sheet 32 (including the folded portion 320) cut out by the cut portion 40 are indicated by broken lines.

  Thus, the ventral waist part 30 has the cut part 40, so that a clip for preventing bleeding or the like attached to the wet navel of the newborn baby who is a wearer or the navel of the newborn is provided. The situation of hitting 30 can be avoided. Moreover, the person (mother etc.) who wears the diaper 1 cares about the contact of the diaper 1 to the navel etc., and does not raise the diaper 1 sufficiently, and as a result, it suppresses generation | occurrence | production of excrement leaking. be able to. In the present embodiment, as shown in FIGS. 1 and 2, the back waistline portion 20 does not have a cut portion, but the cut portion may be provided in the backside waistline portion 20 in particular.

  The plurality of elastic members 33 are arranged side by side in the longitudinal direction between the inner layer sheet 31 and the outer layer sheet 32, and are fixed to the inner layer sheet 31 and the outer layer sheet 32 in a state of being stretched along the lateral direction. ing. In the present embodiment, a plurality of thread rubbers are used as the plurality of elastic members 33. However, it is not always necessary to use a plurality of thread rubbers as in the case of the plurality of elastic members 23. For example, a thread-like polyurethane stretchable fiber or a sheet-like shape is used. An elastic member or the like may be used. 1 and 2, the plurality of elastic members 33 are indicated by broken lines.

  As shown in FIG. 2, the elastic member 33 disposed above the absorbent core 12 in the vertical direction and below the lower end 402 of the cut portion 40 extends from one end to the other end in the horizontal direction. The elastic member 33 that is provided continuously and disposed at a position overlapping 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, the absorbent core 12 is prevented from excessively contracting in the lateral direction even on the abdominal side, and the absorbent core 12 is worn without a gap. It can be closely attached to the stomach, leading to suppression of excrement leakage.

  Further, the elastic member 33 is located on both ends of the cut portion 40 in the lateral direction and on both sides of the cut portion 40 in the lateral direction. It is provided continuously over the part 300.

<About the folded portion 320>
Next, the folding | returning part 320 of the abdominal side waist part 30 is demonstrated more concretely with reference to FIG.

  4A to 4C are explanatory views for explaining the abdominal waistline portion 30, FIG. 4A is a plan explanatory view showing the periphery of the abdominal waistline portion 30 in the expanded and extended state, and FIG. 4B is an IVB-IVB line in FIG. 4A. 4C is a sectional view taken along the line IVC-IVC in FIG. 4A. In FIG. 4B, portions of the inner layer sheet 31 and the outer layer sheet 32 (including the folded portion 320) cut by the cut portion 40 are indicated by broken lines.

  As shown in FIG. 4B and FIG. 4C, the ventral waist part 30 has a portion 35 in which the number of stacked layers is larger than that of the lower end part 34 b due to the provision of the folded-back part 320. In the following description, “a portion 35 having a larger number of stacked layers than the lower end portion 34b” is referred to as an “overlapping portion 35”. Specifically, the number of stacked layers is 2 at the lower end 34b of the ventral waist part 30, whereas the number of stacked layers is 3 at the overlapping portion 35, and the number of stacked layers is larger than that of the lower end 34b. It has become. The number of stacked portions 35 is increased by the amount of the folded portion 320, that is, the amount by which the upper end portion of the outer layer sheet 32 is folded downward. Thereby, the rigidity in the overlapping portion 35 is higher than the rigidity in the lower end portion 34 b of the ventral waist part 30.

  Here, “rigidity” refers to the ease of deformation when the ventral waist part 30 receives an external force, and the rigidity value for comparing the height of rigidity is, for example, according to Gurley stiffness A value obtained by dividing the measured value by the length of the sample piece can be exemplified. The Gurley bending resistance can be measured in accordance with JIS-L1096 using a No. 311 Gurley type flexibility tester manufactured by Yasuda Seiki Seisakusho.

  Thus, by forming the overlapping portion 35 by the folded portion 320, it is not necessary to separately provide a sheet member for increasing the number of stacked layers in the overlapping portion 35, and the number of members for configuring the ventral waist part 30 can be reduced. Although the number can be reduced, the overlapping portion 35 does not necessarily have the folded portion 320. The case where the overlapping portion 35 is formed by providing another sheet member will be described later in the second embodiment.

  In the present embodiment, as shown in FIGS. 4A and 4B, the vertical position of the lower end 352 of the overlapping portion 35 is below the upper end 101 of the absorbent main body 10 and the upper end 121 of the absorbent core 12. Is above. Therefore, the position in the vertical direction of the lower end 352 of the overlapping portion 35 is at least lower than the lower end 402 of the cut portion 40.

  In the present embodiment, as shown in FIG. 4C, the upper end 311 of the inner layer sheet 31 is located below the uppermost end 301 of the ventral waist part 30 in the longitudinal direction. For this reason, in the vertical direction, in the portion from the upper end 311 of the inner layer sheet 31 to the uppermost end 301 of the ventral side waist part 30, the number of stacked sheets is two as in the lower end part 34b, and the number of stacked sheets is three. The overlapping portion 35 is a portion from the lower end 322 of the folded portion 320 to the upper end 311 of the inner layer sheet 31 in the vertical direction.

  That is, the vertical position of the lower end 352 of the overlapping portion 35 is the same as the vertical position of the lower end 322 of the folded portion 320, and the vertical position of the upper end 351 of the overlapping portion 35 is the vertical position of the upper end 311 of the inner layer sheet 31. It is the same as the position in the direction. Therefore, the upper end 351 of the overlapping portion 35 is located below the uppermost end 301 of the ventral waist part 30 in the vertical direction.

  Thus, since the upper edge part (the part above the upper end 311 of the inner layer sheet 31 in the vertical direction) of the ventral waist part 30 does not have the overlapping part 35, the waist part opening 1HB (see FIG. 1). In the vicinity, the rigidity of the ventral waist part 30 becomes softer than the rigidity of the overlapping portion 35, and the touch can be improved when the diaper 1 is worn.

  In the present embodiment, as shown in FIG. 4A, the overlapping portion 35 is located above the lower end 402 of the cut portion 40 in the vertical direction, and is one side in the lateral direction from the edge 401 of the cut portion 40 to the ventral waist portion 30. The end portion 300a and the other end portion 300b (both end portions 300) are provided. Therefore, the two elastic members 33 arranged on both sides of the cut portion 40 in the lateral direction of the ventral waist part 30 and above the lower end 402 of the cut portion 40 in the vertical direction are provided in the overlapping portion 35. ing.

  Below the lower end 402 of the cut portion 40 in the vertical direction, the overlapping portion 35 is provided continuously from one end portion 300a in the lateral direction of the ventral waistline portion 30 to the other end portion 300b. . Therefore, the plurality of elastic members 33 arranged below the lower end 402 of the cut portion 40 in the vertical direction are provided in the overlapping portion 35. In FIG. 4A, a range where the overlapping portion 35 is provided is indicated by a bold line. Thus, in this embodiment, the overlapping portion 35 is provided from the one end portion 300a to the other end portion 300b in the lateral direction of the abdominal waistline portion 30 except for the region of the cut portion 40. The rigidity in is increasing.

  The lower end portion 34 b of the ventral waist part 30 has two stacked sheets, and the rigidity thereof is lower than the rigidity in the overlapping portion 35. Since the lower end portion 34b is close to the wearer's leg, the rigidity at the lower end portion 34b is lower than the rigidity at the overlapping portion 35, so that the wearer's leg is softened and the discomfort at the time of wearing is reduced. Can do.

<Manufacturing method of diaper 1>
Next, the manufacturing method of the diaper 1 is demonstrated with reference to FIG.5 and FIG.6.

  FIG. 5 is an explanatory diagram for explaining a manufacturing process of the diaper 1. FIG. 6 is an explanatory diagram for explaining the folding step S <b> 2 in the manufacturing process of the diaper 1.

  As shown in FIG. 5, the manufacturing method of the diaper 1 according to the present embodiment includes a waistline portion forming step S1, a folding step S2, an absorbent main body transfer step S3, a cut portion forming step S4, and a folding step S5. And a joining step S6 and a cutting step S7.

  In the waistline forming step S <b> 1, the inner layer sheet member P <b> 1 that becomes the inner layer sheet 21 of the back side waistline part 20 and the inner layer sheet 31 of the stomach side waistline part 30, and the outer layer sheet 22 and the stomach side waistline part 30 of the back side waistline part 20. While arranging a plurality of elastic members 23 and 33 along the conveying direction between the outer layer sheet member P2 to be the outer layer sheet 32, these members (the inner layer sheet member P1, the outer layer sheet member P2, and the plurality of elastic members). The members 23 and 33) are conveyed. At this time, the plurality of elastic members 23 and 33 are conveyed in a state of being extended in the conveyance direction.

  Each of the inner layer sheet member P1 and the outer layer sheet member P2 is a cut-out portion for dividing the sheet member into a central portion in the width direction (direction perpendicular to the conveying direction) of the respective sheet members into a back waistline portion 20 side and a ventral waistline portion 30 side. C1 and C2 are formed. The cutout portions C1 and C2 are formed so that the cutout portion C1 of the inner layer sheet member P1 and the cutout portion C2 of the exterior sheet member P2 overlap each other when the inner layer sheet member P1 and the outer layer sheet member P2 are overlapped. Yes. Thus, in the waist part formation process S1, the part corresponding to the back side waist part 20 and the abdominal side waist part 30 of the diaper 1 is formed.

  5 and 6, the conveyance direction of each member is indicated by an arrow MD, and the direction orthogonal to the conveyance direction (orthogonal direction) is indicated by a double arrow CD. In the following description, the transport direction is “MD direction” and the orthogonal direction is “CD direction”.

  In the folding step S2, as shown in FIG. 6, by passing the overlapped inner layer sheet member P1 and outer layer sheet member P2 through the sandwiched portion N, the outer end in the CD direction on the side that becomes the ventral waist part 30 is Wrapped inward. Thereby, as shown in an enlarged view in FIG. 5, a portion corresponding to the folded portion 320 is formed, and a portion corresponding to the overlapping portion 35 is formed. Accordingly, as shown in an enlarged view in FIG. 5, in the waistline forming step S <b> 1, the length in the CD direction on the side serving as the ventral waistline 30 is longer than the length in the CD direction on the side serving as the back waistline 20. It is preset so that

  In the absorbent main body transfer step S3, as shown in FIG. 5, the absorbent main body 10 provided with the absorbent core 12 therein is disposed on the back waistline portion which is arranged with a gap in the CD direction by the cutout portions C1 and C2. Transfer is performed so as to span between the side that becomes 20 and the side that becomes the ventral waist part 30. At this time, transfer is performed so that the longitudinal direction of the absorbent main body 10 is along the CD direction.

  In the cut portion forming step S4, the inner layer sheet member P1 and the outer layer sheet member P2 are cut out in an arc shape from the outer edge in the CD direction toward the inner side on the side that becomes the ventral waist part 30. Thereby, the cut part 40 (refer FIG.1 and FIG.2) is formed. At this time, the cut portion 40 is formed so that the lowermost end 402 of the cut portion 40 is located below the upper end 351 (see FIGS. 4A and 4C) of the overlapping portion 35 formed in the folding step S2. In the manufacturing process of the diaper 1, the cut portion 40 is formed after the overlapping portion 35 having rigidity is formed in the folding step S2.

  In the folding step S <b> 5, the side that becomes the ventral waist part 30 is brought into contact with the side that becomes the back waist part 20 in accordance with the folding position along the MD direction provided in the center part in the longitudinal direction of the absorbent main body 10. Fold like so. Thereby, the absorptive main body 10 is folded in half.

  In the joining step S6, the back waistline portion 20 is formed by, for example, thermal welding or ultrasonic welding in a state where the side to be the back waistline portion 20 and the side to be the abdominal waistline portion 30 are respectively pulled in the direction along the MD direction. A portion corresponding to both end portions 200 in the horizontal direction and a portion corresponding to both end portions 300 in the horizontal direction of the ventral side waist portion 30 are joined. Thereby, the part equivalent to a pair of junction part 100 (refer FIG. 1) is formed.

  In the cutting step S7, the state in which the portions corresponding to the pair of bonding portions 100 in the bonding step S6 are formed is cut along a cutting line along the CD direction. Thereby, the diaper 1 of the folded state is manufactured.

  In the present embodiment, the manufacturing process proceeds in the order of the waistline forming step S1, the folding step S2, the absorbent main body transfer step S3, the cut portion forming step S4, the folding step S5, the joining step S6, and the cutting step S7. However, the order of this step is not necessarily required, and for example, the absorbent main body transfer step S3 may be after the cut portion forming step S4. In that case, the length in the longitudinal direction of the absorbent main body 10 needs to be set to a length that does not overlap the region where the cut portion 40 is formed.

  In the manufacturing process of the diaper 1, at least the step of forming the cut portion 40 (cut portion forming step S <b> 4) is after the folding step S <b> 2 and the joining step S <b> 6 is after the step of forming the cut portion 40. . That is, as a process of increasing the number of stacked layers at the upper end 34a of the ventral waist part 30, a process of forming a portion corresponding to the folded part 320 is a first process, and a process of forming the cut part 40 is a second process. Assuming that the third step is a step of joining a portion corresponding to both lateral end portions 200 of the side waistline portion 20 and a portion corresponding to both lateral end portions 300 of the ventral side waistline portion 30, the first step and the second step And the 3rd process should just be performed in this order at least.

<About the difference from the diaper 1A according to the comparative example>
Next, the difference between the configuration of the diaper 1 according to the present embodiment and the configuration of the diaper 1A according to the comparative example will be described with reference to FIGS.

  7A to 7C are explanatory views for explaining a diaper 1A according to a comparative example, in which FIG. 7A is a plan explanatory view for explaining the state of the ventral waist part 30A side during manufacturing, and FIG. 7B is a ventral waist part of the diaper 1A. Sectional view of the portion 30A, FIG. 7C is an explanatory plan view for explaining the state of the joint portion 100A. 7A and 7C, the plurality of elastic members 33 are not shown for convenience.

  As shown in FIG. 7B, the ventral waistline portion 30A of the diaper 1A according to the comparative example does not have a folded portion, unlike the ventral waistline portion 30 of the diaper 1 according to the present embodiment. That is, the outer layer sheet 32 is not folded back at the upper end. Therefore, as shown in FIG. 7B, the number of layers in the ventral waist part 30A is two from the lowest end 302 to the top end 301 in the vertical direction, and the rigidity in the ventral waist part 30A is the ventral side. Over the entire region of the waistline portion 30A, the rigidity of the overlapping portion 35 of the ventral waistline portion 30 of the diaper 1 according to the present embodiment is low.

  In this case, in the joining step S6 (see FIG. 5), as shown in FIG. 7A, the lateral direction of the back waistline portion 20 with the abdominal waistline portion 30A side pulled in the lateral direction (direction along the MD direction). When the portion corresponding to the two end portions 200 and the portion corresponding to the both end portions 300 in the lateral direction of the ventral waist portion 30 are joined, the upper end portion 34a formed discontinuously by the cut portion 40 is downward (absorbed). May be joined in a state of being turned back to the sex main body 10 side), and as shown in FIG. 7C, the pair of joint portions 100A may be displaced. In FIG. 7C, as an example, a case where a shift occurs only in one joint 100A of the pair of joints 100A is shown.

  However, in the diaper 1 according to the present embodiment, as described above, the abdomen waistline portion 30 includes the overlapping portion 35 in which the number of stacked layers is three above the lower end 402 of the cut portion 40 in the vertical direction. (See FIGS. 4B and 4C), the rigidity in the overlapping portion 35 is higher than the rigidity in the upper end 34a of the ventral waist part 30A according to the comparative example, and the ventral waist part 30 in the joining step S6. In the state where the side to be turned is pulled in the lateral direction (direction along the MD direction), that is, in the state where the plurality of elastic members 33 are extended, the portion corresponding to both lateral ends 200 of the back side waistline portion 20 and the ventral side Even when the joining operation is performed with the portions corresponding to the both end portions 300 in the lateral direction of the waistline portion 30, the upper end portion 34 a is unlikely to be turned downward, and the pair of joint portions 100. It is possible to suppress the occurrence of a definitive shift.

  In the manufacturing method of the diaper 1, the cut portion is formed in a state where the number of layers in the upper end portion 34a of the ventral waist part 30 is increased in the folding step S2 (by forming a portion corresponding to the folded portion 320) to increase rigidity. Since the cut part 40 is formed in the process S4 and then the process proceeds to the joining process S6, the part corresponding to the upper end part 34a of the ventral waist part 30 is difficult to turn in the joining process S6. It is possible to suppress the occurrence.

  In the present embodiment, as described above, the position of the lower end 352 of the overlapping portion 35 is below the lower end 402 of the cut portion 40 in the vertical direction, and further below the upper end 101 of the absorbent main body 10. For this reason (see FIGS. 4A to 4C), the overlapping portion 35 is provided in a wider region in the vertical direction, and the portion having high rigidity is increased. Therefore, even when the both end portions 200 in the lateral direction of the back side waistline portion 20 and the both end portions 300 in the lateral direction of the abdominal side waistline portion 30 are joined in a state where the abdominal waistline portion 30 is pulled in the lateral direction, 34a is more difficult to roll in the downward direction.

  In the present embodiment, as described above, at least above the lower end 402 of the cut portion 40 in the vertical direction, the overlapping portion 35 extends from the edge 401 of the cut portion 40 to both lateral ends 300 of the ventral waist portion 30. (See FIG. 4A), the rigidity is high in the entire region in the lateral direction on both sides of the cut portion 40 in the lateral direction. Note that the overlapping portion 35 does not necessarily have to be provided from the edge 401 to the both end portions 300 in the lateral direction of the ventral waist part 30, but is provided in a part of the region on both sides of the cut portion 40 in the lateral direction. May be.

  In addition, the elastic member 33 having rigidity is provided on both sides of the cut portion 40 in the horizontal direction and above the lower end 402 of the cut portion 40 in the vertical direction, and overlaps the overlapping portion 35. (Refer FIG. 4A) and the rigidity in the upper end part 34a of the abdominal side waist part 30 is increasing more. Therefore, even when the both end portions 200 in the lateral direction of the back side waistline portion 20 and the both end portions 300 in the lateral direction of the abdominal side waistline portion 30 are joined in a state where the abdominal waistline portion 30 is pulled in the lateral direction, 34a becomes more difficult to bend downward. The elastic member 33 is not necessarily provided so as to overlap the overlapping portion 35.

=== Modification 1 ===
Next, the structure of the diaper 1B which concerns on the modification 1 is demonstrated with reference to FIG.

  8A to 8C are explanatory diagrams for explaining the ventral waist part 30B of the diaper 1B according to the first modification, and FIG. 8A is a plan explanatory view showing the periphery of the ventral waist part 30B in the expanded and extended state, FIG. Is a sectional view taken along line VIIIB-VIIIB in FIG. 8A, and FIG. 8C is a sectional view taken along line VIIIC-VIIIC in FIG. 8A. 8A to 8C, the same components as those described for the diaper 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The same applies to Modification 2 (FIGS. 9A to 9C) and the second embodiment (FIGS. 10A to 10C and 11).

  In the diaper 1B according to this modification, the vertical length of the overlapping portion 35B is shorter than the vertical length of the overlapping portion 35 of the diaper 1 according to the first embodiment. That is, the folding amount of the upper end portion of the outer layer sheet 32 of the ventral waist part 30B is smaller than that of the diaper 1 according to the first embodiment, and the longitudinal length of the folding portion 320B is the diaper according to the first embodiment. It is shorter than the length in the vertical direction of one folded portion 320.

  Specifically, as illustrated in FIG. 8A, the vertical position of the lower end 352 of the overlapping portion 35 </ b> B is above the lower end 402 of the cut portion 40. Therefore, as shown in FIG. 8B, the overlapping portion 35B is not provided below the lower end 402 of the cut portion 40 in the vertical direction, and the cut portion 40 in the horizontal direction is not provided as shown in FIGS. 8A and 8C. They are only provided in the lateral direction on both sides. In FIG. 8A, the range of the overlapping portion 35B is indicated by a bold line.

  Even in this case, the upper side of the lower end 402 of the cut portion 40 in the longitudinal direction of the ventral side waist portion 30B has an overlapping portion 35B that is higher in rigidity than the lower end portion 34b. In a state where the waistline portion 30B is pulled in the lateral direction (direction along the MD direction), that is, in a state where the plurality of elastic members 33 are extended, the lateral end portions 200 of the back side waistline portion 20 and the ventral side waistline portion 30B Even when the joining operation is performed with the both end portions 300 in the horizontal direction, the upper end portion 34a is unlikely to be turned downward, and the occurrence of displacement in the pair of joining portions 100 can be suppressed.

  Therefore, like the diaper 1 according to the first embodiment, the overlapping portion does not necessarily have the lower end 352 positioned below the lower end 402 of the cut portion 40 in the vertical direction, and at least the cut portion 40 in the vertical direction. What is necessary is just to have the overlapping part 35 above the lower end 402 of this.

=== Variation 2 ===
Next, the structure of the diaper 1C which concerns on the modification 2 is demonstrated with reference to FIG.

  9A to 9C are explanatory views for explaining the ventral waist part 30C of the diaper 1C according to the modified example 2. FIG. 9A is a plan explanatory view showing the periphery of the ventral waist part 30C in the expanded and extended state, and FIG. 9B. FIG. 9A 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.

  In the diaper 1C according to this modification, the length in the vertical direction of the overlapping portion 35C is longer than the length in the vertical direction of the overlapping portion 35 of the diaper 1 according to the first embodiment. Specifically, the folding amount of the upper end portion of the outer layer sheet 32 of the ventral waist part 30C is larger than that of the diaper 1 according to the first embodiment, and the longitudinal length of the folding portion 320C is the first embodiment. It is longer than the length of the folded part 320 of the diaper 1 according to the vertical direction.

  Therefore, as shown in FIG. 9A, the position in the vertical direction of the lower end 352 of the overlapping portion 35C is lower than the upper end 121 of the absorbent core 12 of the absorbent main body 10 in the vertical direction, as shown in FIG. 9B. The overlapping portion 35C is provided so as to overlap the absorbent core 12 in the thickness direction. However, as shown in FIG. 9A, the overlapping portion 35C is not provided at the lower end portion 34b of the ventral waist part 30C, and the number of stacked layers is two at the lower end portion 34b in this modified example.

  In this case, since the overlapping portion 35C is provided up to the position where it overlaps the absorbent core 12 having a thickness, the portion having high rigidity in the vertical direction is further increased, and the ventral waist portion 30C is laterally (along the MD direction). Direction), that is, in a state where the plurality of elastic members 33 are extended, the joining operation between the lateral end portions 200 of the back waistline portion 20 and the lateral end portions 300 of the ventral waistline portion 30C is performed. Even in such a case, the upper end portion 34a is less likely to bend downward, and the occurrence of displacement at the pair of joint portions 100 can be further suppressed.

=== Second Embodiment ===
Next, a diaper 1D according to a second embodiment of the present invention will be described with reference to FIGS.

  10A to 10C are explanatory views illustrating the abdominal waistline portion 30D of the diaper 1D according to the second embodiment, and FIG. 10A is an explanatory plan view showing the periphery of the ventral waistline portion 30D in the expanded and extended state, FIG. Is a cross-sectional view taken along line XB-XB in FIG. 10A, and FIG. 10C is a cross-sectional view taken along line IVC-IVC in FIG. 10A. FIG. 11 is an explanatory diagram for explaining the overlapping step S20 in the manufacturing process of the diaper 1D according to the second embodiment.

  Unlike the configuration of the overlapping portion 35 of the diaper 1 according to the first embodiment, the diaper 1D according to the present embodiment does not have a folded portion, and as shown in FIG. Another sheet 36 is provided as a sheet member different from the sheet members (the inner layer sheet 31 and the outer layer sheet 32) constituting the lower end part 34b of the part 30D.

  In the manufacturing process of the diaper 1D according to the present embodiment, the overlapping portion 35D is formed by performing the overlapping process S20 instead of the folding process S2 in the manufacturing process of the diaper 1 according to the first embodiment. Specifically, after passing through the waistline portion forming step S1 (see FIG. 5), as shown in FIG. 11, in the overlapping step S20, a sheet member (separate sheet 36) different from the inner layer sheet member P1 and the outer layer sheet member P2. Is overlapped with the end on the outer side in the CD direction on the side to be the ventral waist part 30D. Thereby, the overlapping portion 35D having a larger number of stacked layers than the lower end portion 34b is formed.

  In this way, another sheet 36 different from the inner layer sheet 31 and the outer layer sheet 32 constituting the lower end part 34b of the ventral waist part 30D is laminated at least above the lower end 402 of the cut part 40 in the vertical direction and overlapped. By forming 35D, for example, the diaper 1D can be manufactured without requiring a complicated process as compared with the case of forming the overlapping portion 35 by folding the upper end portion of the outer layer sheet 32 like the diaper 1 according to the first embodiment. can do.

  In the present embodiment, as shown in FIG. 10B, the separate sheet 36 is provided on the skin side of the inner layer sheet 31 and on the non-skin side of the absorbent main body 10 in the thickness direction, but is not limited thereto. For example, you may provide in the skin side of the absorptive main body 10 so that a part of other end side 10b of the absorptive main body 10 may be covered. In this case, the level | step difference between the absorptive main body 10 and the abdominal side waist part 30D can be eased, and the uncomfortable feeling at the time of wear can also be suppressed.

=== Others ===
The above-described embodiments are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

  In the above embodiment, a so-called three-piece type diaper divided into three parts has been described as an example. However, the present invention is not limited thereto, and for example, the back waistline portion, the ventral waistline portion, and the absorbent main body are integrally formed. It may be a diaper that is formed and joined to both lateral ends of the back waistline and lateral sides of the abdomen waistline.

  Moreover, in said embodiment, although the wear object of the diaper was demonstrated as a newborn baby, not only this but adults, such as infants and elderly people older than a newborn, may be made into a wear object.

  Further, in the above embodiment, the position of the upper end 351 of the overlapping portion 35 in the vertical direction is lower than the uppermost end 301 of the waistline portions 30, 30B, 30C, 30D. The upper end 351 of the overlapping portion 35 may be positioned at the uppermost end 301 in the vertical direction.

  In the above embodiment, in the ventral side waist part 30, the number of stacked layers at the lower end 34b is 2 and the number of stacked layers in the overlapping portion 35 is 3. However, the number of stacked layers is not particularly limited.

  Further, in the above embodiment, the overlapping portion 35 is formed in the abdominal waistline portion 30, but is not limited to the abdominal waistline portion 30, and the overlapping portion 35 is also formed in the backside waistline portion 20. It may be.

1,1B, 1C, 1D ... Diapers (disposable diapers)
DESCRIPTION OF SYMBOLS 10 ... Absorbent main body 12 ... Absorbent core 20 ... Back side waistline part 30 ... Abdominal side waistline part 31 ... Inner layer sheet (sheet member)
32 ... Outer layer sheet (sheet member)
33 ... Elastic member 34a ... Upper end 34b ... Lower end 35 ... Overlapping part (part where the number of stacked layers is larger than the lower end part)
36 ... Separate sheet 40 ... Cut portion 101 ... Upper end 121 of absorbent main body ... Upper end 200, 300 of absorbent core ... Both end portions 300a ... One end portion 300b ... Other end portion 301 ... Uppermost end 320 of the ventral waist part , 320B, 320C... Folded portion 351... Upper end 401 of overlapping portion ... edge 402 of cut portion ... lower end S2 of cut portion ... folding step (first step)
S4 ... Cut part forming step (second step)
S6 ... Joining step (third step)

Claims (8)

A longitudinal direction and a transverse direction intersecting the longitudinal direction,
An absorbent body that absorbs excreta;
A back waistline portion located on one end side of the absorbent main body,
A ventral waist part located on the other end side of the absorbent main body,
The both lateral ends of the back waistline and the lateral ends of the ventral waist are joined disposable diapers, respectively.
The central portion of the ventral side waistline portion in the lateral direction, the upper end portion of the ventral side waistline portion in the longitudinal direction is provided with a cut portion,
On the upper side of the lower end of the cut part in the longitudinal direction of the ventral side waist part, it has a portion with a larger number of layers than the lower end part in the longitudinal direction of the ventral side waist part ,
The ventral waist part has a sheet member,
In the portion where the number of stacked layers is larger than the lower end portion of the ventral side waist portion, a sheet member different from the sheet member constituting the lower end portion is provided,
An upper end of a portion where the number of stacked layers is larger than that of the lower end portion of the abdominal waistline portion is located on the lower side in the vertical direction with respect to the uppermost end of the abdominal waistline portion. Disposable diapers. The disposable diaper according to claim 1,
The portion where the number of stacked layers is larger than the lower end portion of the ventral waist part is provided from the edge of the cut part in the lateral direction to both lateral ends of the ventral waist part. Disposable diapers. The disposable diaper according to claim 1 or 2,
The disposable diaper characterized in that a position of a lower end of a portion where the number of stacked layers is larger than that of the lower end portion of the belly side waistline portion is lower than a lower end of the cut portion in the longitudinal direction. The disposable diaper according to claim 3,
The disposable diaper characterized in that a position of a lower end of a portion where the number of stacked layers is larger than that of the lower end portion of the belly side waist portion is lower than an upper end of the absorbent main body in the longitudinal direction. The disposable diaper according to claim 4,
The absorbent body has an absorbent core inside,
The disposable diaper characterized in that a position of a lower end of a portion where the number of stacked layers is larger than that of the lower end portion of the belly side waist portion is lower than an upper end of the absorbent core in the longitudinal direction. It is a disposable diaper in any one of Claims 1-5 ,
The ventral waist part includes elastic members that extend in the lateral direction on both sides of the cut part in the lateral direction and above the lower end of the cut part in the longitudinal direction. Disposable diapers. The disposable diaper according to claim 6 ,
The disposable diaper characterized in that the elastic member is provided in a portion where the number of stacked layers is larger than that of the lower end portion of the ventral waist part. A longitudinal direction and a transverse direction intersecting the longitudinal direction,
An absorbent body that absorbs excreta;
A back waistline portion located on one end side of the absorbent main body,
A ventral waist part located on the other end of the absorbent body;
A disposable diaper manufacturing method comprising:
A first step of increasing the number of stacked layers above the lower end in the longitudinal direction of the ventral waist part;
After the first step, a second step of forming a cut portion at a central portion of the ventral waistline portion in the lateral direction and an upper end portion of the ventral waistline portion in the longitudinal direction;
After the second step, the third step of joining both the lateral ends of the dorsal waistline and the lateral ends of the ventral waistline, respectively,
In the second step, it is a method for manufacturing a disposable diaper in which the cut portion is formed so that the lowermost end of the cut portion is below the upper end of the portion having a large number of stacked layers formed in the first step . ,
The ventral waist part has a sheet member,
A sheet member different from the sheet member constituting the lower end portion is provided in a portion where the number of stacked layers is larger than the lower end portion of the ventral waist part,
The disposable diaper characterized in that an upper end of a portion where the number of stacked layers is larger than that of the lower end portion of the abdominal waist part is located below the uppermost end of the abdominal waist part in the longitudinal direction. Manufacturing method.

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