JP7382295B2 - Pants type disposable diaper - Google Patents

Description

The present invention relates to a pants-type disposable diaper with a waist end covered.

Conventionally known types of disposable diapers can be roughly divided into two types: tape type and pants type. In a tape-type disposable diaper, a waist portion that covers the wearer's waist is formed by interconnecting the front body and the back body with a tape installed on the side of the front body or the back body. Along with this, a waist opening and a pair of leg openings are formed.

On the other hand, in a pants-type disposable diaper, the sides of the front body and the back body are bonded to each other in advance using hot melt or the like, and the diaper forms a pant body without being assembled like a tape-type disposable diaper.

In recent years, pants-type disposable diapers have been introduced in order to make it easier for consumers who have traditionally worn underwear but are considering using disposable diapers as they start to experience incontinence symptoms to feel less reluctant to wear disposable diapers. Technology is being developed to make the material and texture similar to underwear.

Some of these pants-type disposable diapers have a stretchable film or stretchable nonwoven fabric arranged around the waist to ensure a texture similar to that of underwear. Conventional pants-type disposable diapers have a plurality of rubber threads arranged around the waist at predetermined intervals in the front-rear direction, so when worn, the rubber threads tend to contract and cause folds, and these folds cause the outer ( Pants, skirts, etc.) have the disadvantage that they tend to bulge out, but as mentioned above, by placing a stretchable film or stretchable nonwoven fabric around the waist, it is possible to suppress the occurrence of such folds, that is, to reduce the occurrence of folds. can do.

By the way, as prior art related to the present invention, there are the following patent documents 1 to 3.
The pants-type absorbent article disclosed in Patent Document 1 includes a folded part that is folded back toward the skin contacting surface along the peripheral edge of the waist opening. This folding section does not join multiple sheets with adhesive, but rather by melting the constituent resin of the sheets and solidifying the melted resin in contact with the adjacent sheets. If the folded sheets are joined with adhesive, there is a risk that the adhesive will ooze out to the skin-contacting side of the diaper and stick to the body when the diaper is worn, causing discomfort. discloses the effect that such discomfort does not occur by not using an adhesive.

The pants-type disposable diaper disclosed in Patent Document 2 has a gathered portion formed by being contracted in the circumferential direction, and a wavy portion that projects outward from the gathered portion, and extends along the circumferential direction. A plurality of frills are provided at intervals in the longitudinal direction around the waist, and the wavy portions of the frills are configured to cover the elastic elastic member below the waist. When the lower waist elastic stretch part and the constriction wrinkles that occur due to this are hidden under the frill, the user does not get the impression that the constriction is too tight, creating a clean appearance with no visible constriction wrinkles. The effect that the frill itself looks good is disclosed.

The elastic structure of the absorbent article disclosed in Patent Document 3 is made of a single sheet of breathable material, and has a plurality of pleats arranged in parallel at intervals so as not to overlap in the laid down state, and each fold in the laid down state. It has a sheet-like member having overlapping inter-fold portions, and an elongated elastic stretchable member provided along the longitudinal direction of the pleats between opposing surfaces of the respective pleats. This stretchable structure uses a single sheet of breathable material to form pleats, and an elastic stretchable member is installed within the folds, resulting in a significant reduction in material costs compared to the conventional structure sandwiched between two sheets of breathable material. It has been disclosed that the effect can be reduced. Patent Document 3 also discloses an absorbent article having such a stretchable structure.

Japanese Patent Application Publication No. 2018-057465 Patent No. 4659109 Japanese Patent Application Publication No. 2015-142714

However, even if a stretchable film or stretchable non-woven fabric is used around the waist as mentioned above, a stronger tightening force is applied to the waist (near the waist opening) than around the waist to prevent the disposable diaper from slipping off. need to be granted. Therefore, instead of a stretchable film or stretchable nonwoven fabric, it is necessary to arrange a rubber thread with strong shrinkage force in this waist portion. Since a plurality of rubber threads having a strong contractile force are arranged in the waist region at intervals in the front-rear direction of the pants, finer tightening wrinkles occur in the waist region than in the waist region. Many underwear have elastic threads placed at the waist, so the wrinkles that occur at the waist of disposable diapers can be considered acceptable, but the presence of wrinkles at the waist may cause consumers to feel tight. It gives the impression of being strong and makes people feel uncomfortable when wearing it, which may reduce the desire to purchase it.

Furthermore, Patent Documents 1 to 3 each have the following problems.
The pants-type absorbent article disclosed in Patent Document 1 has a plurality of sheets folded back toward the skin-contacting surface, so that the plurality of elastic members provided near the waist opening have a large number of elastic members on the skin side. The sheets are stacked one on top of the other. Therefore, when the elastic member contracts, the contraction effect is not sufficiently exerted, and the tightening force at the waist portion becomes weak, which may cause the pants-type absorbent article to slip off.

In the pants-type disposable diaper disclosed in Patent Document 2, the elastic elastic member below the waist is hidden by a frill placed around the waist, but the waist elastic elastic member placed at the waist is not hidden at all. Therefore, it has not been possible to fully dispel the impression that the diapers are too tight when looking at pant-type disposable diapers.

The stretchable structure of the absorbent article disclosed in Patent Document 3 and the absorbent article equipped with the stretchable structure also have pleats around the waist, but the waist elastic stretchable member disposed in the waist region has no folds. Not hidden. Therefore, when consumers look at the absorbent article, they may get the impression that the absorbent article is too tight.

Therefore, the main object of the present invention is to provide a disposable diaper that does not give the impression that the waist portion is tightly tightened.

The present invention that solves the above problems is as follows.
<First aspect of invention>
Both sides of the front body and both sides of the back body are joined to form a side seal, and a waist opening and a pair of left and right leg openings are formed.
A pants-type disposable diaper in which a plurality of circumferential waist elastic elastic members are attached to the waist end forming the edge of the waist opening at intervals in the vertical direction,
A sheet constituting at least one of the front body and the back body has a folded part that is folded back outward at the waist end,
the folded portion overlies the waist elastic elastic member;
A pants-type disposable diaper characterized by:

(effect)
By configuring the folded portion to cover the waist elastic elastic member, the waist elastic elastic member cannot be visually recognized from the outside. As a result, consumers are less likely to be given the impression that the waist portion is tightly tightened, and it is possible to prevent a decrease in purchasing desire caused by associations with discomfort when worn.

<Second aspect of invention>
The pants-type disposable diaper according to the first aspect, wherein the folded portion is not joined to both sides of the front body and both sides of the back body at the side seal portion.

(effect)
In the side seal portion, by not joining the folded portions to both sides of the front body and both sides of the back body, the number of sheets to be side sealed is reduced, making side sealing easier during manufacturing.

Furthermore, as the number of sheets to be side-sealed increases, the sealing needs to be made stronger. As a result, it becomes difficult for the consumer to tear the side seals when tearing them off after using the diaper. By not joining the folded portions to both sides of the front body and both sides of the back body as in this embodiment, the number of sheets to be side-sealed is reduced, making it easier to tear the side seals.

Furthermore, since the frill-shaped disposable diaper described in Patent Document 2 has frills, the number of laminated sheets in the side seal portion frequently changes in the front-rear direction. Therefore, when a consumer tears the side seal after using such a frill-shaped disposable diaper, horizontal tearing is likely to occur at the portion where the number of laminated sheets changes. By not joining the folded portions to both sides of the front body and both sides of the back body as in this embodiment, the number of sheets to be side-sealed is reduced, so the occurrence of such horizontal tears can be suppressed.

<Invention of the third aspect>
The pants-type disposable diaper according to the second aspect, in which the folded portion does not cover the side seal.

(effect)
The same effect as the second aspect is achieved.

In addition, when manufacturing a diaper in which the folded part covers the side seal, for example, before folding the folded part, both sides of the front body and both sides of the back body are joined in advance to form the side seal part. Then, fold back the folded part. However, during manufacturing, the Belcoton Bear carrying the diaper is moving at high speed, so it is not easy to seal only the parts other than the folded part without sealing the folded part (positioning is not easy) .

If the folded portion does not overlap the side seal as in this embodiment, the above-mentioned positioning during manufacturing becomes unnecessary, and manufacturing of the diaper becomes easier.

An example of a method in which the folded portion does not overlap the side seal is a method in which a portion of the folded portion that overlaps with the side seal portion is cut out in advance. In order to prevent the folded part from overlapping the side seal, the width of this notch provided in the folded part must be longer than the width of the side seal part.

<Invention of the fourth aspect>
The folded portion consists of a plurality of sheets,
In the side seal portion, the inner sheet of the folded part is joined to both sides of the front body and both sides of the back body, and the sheet outside of the folded part is joined to both sides of the front body and the back body. The pants-type disposable diaper according to the first aspect, which is not joined to both sides of the back body.

(effect)
In the case where the folded portion includes a plurality of sheets, some of the sheets of the folded portion may be joined to both sides of the front body and both sides of the back body. The mode in which some of the sheets in the folded part are joined together suppresses the worsening of the difficulty in tearing the side seal part, since the side seal part is thinner than the mode in which all the sheets in the folded part are joined. I can do it.

<Invention of the fifth aspect>
The folded portion consists of a plurality of sheets,
The pants-type disposable diaper according to the first aspect, wherein the length of the inner sheet of the folded portion in the front-rear direction is longer than the length of the outer sheet in the front-rear direction.

(effect)
By forming the folded part from multiple sheets and making the length of the inner sheet of the folded part in the longitudinal direction longer than the length of the outer sheet in the longitudinal direction, a frill-like shape is created at the waist end. can be provided. As a result, it is possible to stimulate the desire of female consumers to purchase.

<Invention of the sixth aspect>
The folded portion consists of a plurality of sheets,
The pants-type disposable diaper according to the first or fifth aspect, wherein the color density of the inner sheet of the folded portion is darker than the color density of the outer sheet.

(effect)
By forming the folded part from multiple sheets and making the color density of the inner sheet of the folded part darker than the color density of the outer sheet, a sense of depth is created in the sheets that make up the folded part. This makes it possible to further arouse consumers' desire to purchase.

<Seventh aspect of invention>
The folded portion consists of a plurality of sheets,
The pants-type disposable diaper according to any one of the first, fifth and sixth aspects, wherein the colors of adjacent sheets of the folded portion are the same color or similar colors on a color wheel.

(effect)
If the color of each sheet that makes up the folded part is, for example, an opposite color on the color wheel (specifically, if the color of the outer sheet is yellow and the color of the inner sheet is purple), the color of each sheet The colors in the overlapping areas tend to look dirty. This tendency is particularly high when the sheet constituting the folded portion is thin and highly transparent. By setting the colors of the sheets constituting the folded portion to be the same color or similar colors on the color wheel, when the sheets are overlapped, the colors can appear beautiful, and consumers' desire to purchase can be increased.

<Invention of the eighth aspect>
The pants-type disposable diaper according to the first aspect, in which the leading end of the sheet constituting the folded portion is folded back inward.

(effect)
By further folding back the leading end of the sheet constituting the folded portion, the number of sheets stacked in the folded portion increases. As a result, there is an effect that the waist elastic stretchable member provided at the waist end portion itself and the wrinkles caused by the waist elastic stretchable member become more difficult to see. Furthermore, if the number of laminated sheets in the folded portion provided at the waist end is large, the consumer is likely to feel a soft touch when touching the folded portion, which can provide a comfortable sensation to the consumer.

<Invention of the ninth aspect>
The folded portion consists of a plurality of sheets,
The waist elastic stretch member is not provided between the first sheet located at the outermost side of the folded portion and the second sheet located at the next outer side,
The pants-type disposable diaper according to the first aspect, wherein the waist elastic stretch member is provided between the second sheet of the folded portion and the outermost sheet of the non-folded sheets.

(effect)
When an elastic waist elastic member is provided between the second sheet of the folded portion and the outermost sheet among the unfolded sheets, the contraction of the waist elastic elastic member causes the tip of the sheet forming the folded portion to This makes it easier to create a wavy shape in the area, and the wavy shape creates a soft appearance and cuteness, which increases the appeal of the product. Moreover, by not providing a waist elastic elastic member between the first sheet and the second sheet, wrinkles caused by contraction of the waist elastic member can be covered up by the first sheet, making it easier for consumers to On the other hand, it is difficult to give the impression that the grip is strong.

As described above, according to the present invention, it is possible to provide a disposable diaper that does not give the impression that the waist portion has a strong tightening force.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing the inner surface of the pants-type disposable diaper according to the first embodiment of the present invention in a state where the diaper is unfolded. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing the outer surface of the pants-type disposable diaper according to the first embodiment of the present invention in a state in which the diaper is unfolded. 2 is a sectional view taken along line 4-4 in FIG. 1. FIG. 2 is a sectional view taken along line 5-5 in FIG. 1. FIG. (5A) It is a sectional view taken along the line 6-6 in FIG. 2. (5B) This is another embodiment of the above (5A). (6A) This is another embodiment of the above (5A). (6B) This is another embodiment of the above (5A). (7A) It is a front view of the ventral side before the folded portion is folded back. (7B) It is a front view of the ventral side after the folded portion is folded back from the state of (7A). (7C) It is a sectional view taken along the line XX of the above (7B). (8A) In another embodiment, it is a front view of the ventral side before the folded portion is folded back. (8B) It is a front view of the ventral side after the folded portion is folded back from the state of (8A). (8C) It is a sectional view taken along YY line of (8B). (9A) In another embodiment, it is a front view of the ventral side before the folded portion is folded back. (9B) It is a front view of the ventral side after the folded portion is folded back from the state of (9A). (9C) It is a ZZ line sectional view of the above (9B). FIG. 1 is a ventral front view showing a state in which the pants-type disposable diaper according to the present invention is worn. (11A) This is another embodiment of the above (5A). (11B) This is another embodiment of the above (5A).

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
1 to 11 show a pants-type disposable diaper according to the present invention. This pant-type disposable diaper (hereinafter also simply referred to as a diaper) includes an exterior body 19 that spans a front body F and a back body B, and an interior body that is fixed to the inner surface of the exterior body 19 and extends from the front body F to the back body B. 10. The interior body 10 includes an absorbent body 17 interposed between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. During manufacturing, after the back surface of the interior body 10 is joined to the inner surface (top surface) of the exterior body 19 using a joining means such as hot melt adhesive, the interior body 10 and the exterior body 19 are attached to the front body F and the back body B. The waist opening WO and the left and right sides are folded at the center in the front-rear direction (vertical direction), which is the boundary between the waist opening WO and the left and right sides. This is a pants-type disposable diaper in which a pair of leg openings LO are formed. Note that the boundary position between the front body F and the back body B of the inner body 10 is the same as or almost the same as the boundary position between the front body F and the rear body B of the outer body 19, and the center of the disposable diaper in the front-rear direction LD is This is the boundary position.

Note that the "anteroposterior direction LD" means the direction connecting the ventral side FS (front side) and the dorsal side BS (back side). The "width direction WD" is a direction (left-right direction) orthogonal to the front-rear direction LD, and means a direction connecting the left side LS and the right side RS. "Thickness direction TD (longitudinal direction)" is the thickness direction of the diaper, and means the direction connecting the inner IS and the outer OS.

(Interior body 10)
As shown in FIGS. 3 and 4, the interior body 10 has a structure in which an absorbing element 49 is interposed between the top sheet 11 and the back sheet 12, and absorbs the excreted liquid that has passed through the top sheet 11. It is absorbed and retained by the absorber 17 of the absorbent element 49. Although the planar shape of the interior body 10 is not particularly limited, it is generally approximately rectangular as shown in the drawings.

(Top sheet 11)
As the top sheet 11 that covers the front side (also referred to as "skin contact side" or "inner side") of the absorbent element 49, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is suitably used. The material fibers constituting the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, as well as recycled fibers such as rayon and cupro, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is superior in terms of flexibility and drapability, and the thermal bond method is superior in that it is bulky and soft. When a large number of through holes are formed in the top sheet 11, there is an advantage that urine and the like are quickly absorbed. In the illustrated embodiment, the top sheet 11 wraps around the side edges of the absorbent core 17 in the width direction WD and extends to the back side of the absorbent core 17 .
(Absorption element 49)
The absorbent element 49 includes an absorbent core 17 and a packaging sheet 14 that wraps the entire absorbent core 17 . The packaging sheet 14 can also be omitted.

(Absorber 17)
The absorbent body 17 can be formed from an aggregate of fibers. These fiber aggregates include those obtained by stacking short fibers such as cotton pulp and synthetic fibers, as well as filament aggregates obtained by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate as necessary. can also be used. The fiber weight can be, for example, about 100 to 300 g/m ² when stacking cotton-like pulp or short fibers, and about 30 to 120 g/m ² in the case of filament aggregates. I can do it. The fineness of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament assembly, the filaments may be non-crimped fibers, but are preferably crimped fibers. The degree of crimps of the crimped fibers can be, for example, about 5 to 75 crimps, preferably 10 to 50 crimps, and more preferably 15 to 50 crimps per inch. Further, crimped fibers that are uniformly crimped are often used. Preferably, superabsorbent polymer particles are dispersed and held in the absorbent body 17.

The absorbent body 17 may have a rectangular shape, but as shown in FIG. It is preferable that the absorber 17 has an hourglass shape because it improves the fit of the absorber 17 around the leg.

(Super absorbent polymer particles)
The absorbent body 17 can contain superabsorbent polymer particles in part or in whole. The term "superabsorbent polymer particles" includes "powder" in addition to "particles." As for the particle size of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and it is preferably 1000 μm or less, particularly 150 to 400 μm. Although any material can be used for the superabsorbent polymer particles without particular limitation, those with a water absorption of 40 g/g or more are preferred. Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles, including starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and cross-linked sodium carboxymethyl cellulose. Materials such as acrylic acid (salt) and acrylic acid (salt) polymers can be used. The shape of the superabsorbent polymer particles is preferably a commonly used powder or granule, but other shapes can also be used.

(Packaging sheet 14)
When the packaging sheet 14 is used, tissue paper, especially crepe paper, nonwoven fabric, polylaminated nonwoven fabric, a perforated sheet, etc. can be used as the material. However, it is desirable that the sheet be a sheet that does not allow the superabsorbent polymer particles to escape. When using a nonwoven fabric instead of crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and its material may be polypropylene, polyethylene/polypropylene composite, or the like. The basis weight is preferably 5 to 40 g/m ² , particularly 10 to 30 g/m ² .

The packaging form of the packaging sheet 14 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of superabsorbent polymer particles from the front and rear edges, etc. It is preferable to wrap the absorbent body into a shape, have its front and rear edges protrude from the front and rear of the absorbent body 17, crush the protruding portions in the front and back directions, and join them using a joining means such as a hot melt adhesive.

(Back sheet 12)
The back sheet 12 that covers the back side (also referred to as the "non-skin contact side" or "outer side") of the absorbent element 49 is a liquid-impermeable plastic sheet such as polyethylene or polypropylene, but in recent years, it has been used to prevent stuffiness. From this point of view, those having moisture permeability are preferably used. This water-blocking/breathable sheet can be obtained by melt-kneading inorganic fine particles such as calcium carbonate in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in uniaxial or biaxial directions. A microporous sheet can be suitably used. In the illustrated embodiment, the back sheet 12 is folded back together with the top sheet 11 on both sides of the absorber 17 in the width direction WD, but the structure is not limited to this, and other known structures may also be adopted. .

(3D gather BG)
Three-dimensional gathers BG that fit mainly around the legs are formed on both sides of the interior body 10. As shown in FIG. 4, the three-dimensional gathers BG includes a fixed part fixed to the side of the back surface of the interior body 10, and from this fixed part to the side of the front surface of the interior body through the side of the interior body 10. An extending main body part, a folded part formed by fixing the front and rear ends of the main body part to the sides of the surface of the interior body in a folded state, and a free part formed by not fixing the folded parts. is formed by a gathered sheet 22 which is folded back to form a double sheet, and between the double sheets, an elongated gathered elastic member 16 is disposed at the tip of the free portion or the like. With this structure, the free portion of the three-dimensional gathers BG that protrudes from the side edge of the absorbent body due to contraction of the gather elastic member 16 stands up as shown by the two-dot chain line in FIG. 4 in the product state. As the gather sheet 22, a water-repellent nonwoven fabric is preferably used. On the back side of the absorbent element 49, an inner sheet 22I of the gathered sheet 22 (double sheet) is separated into a left side portion and a right side portion in the width direction WD, and an outer sheet 22O of the gathered sheet 22 has a width It has a structure in which the left and right sides are connected in the direction WD. As shown in FIG. 3, the outer sheet 22O of the gather sheet 22 located on the back side of the absorbent element 49 extends to both ends of the diaper in the front-rear direction LD, and is folded back outward at the waist end to form a folded part 90. Form. On the other hand, the portions of the gather sheet 22 other than the outer sheet 22O (the inner sheet 22I, the portion adjacent to the side of the absorbent element 49, the portion located inside the absorbent element 49 and which collapses the three-dimensional gathers BG, etc.) are absorbent elements. It is slightly longer in the front-rear direction LD than the top sheet 49, and the position in the front-rear direction LD is almost the same as the top sheet 11.

Of course, the above embodiment is just an example, and may be changed to other embodiments. For example, the inner sheet 22I and outer sheet 22O of the gathered sheet 22 described above may be reversed. That is, the inner sheet 22I of the gathered sheet 22 has a structure in which the left and right sides in the width direction WD are connected, and only the inner sheet 22I extends to both ends in the front-rear direction LD, and is folded back outward at the waist end to form the folded part 90. It may be formed. Further, there is also a form in which both the inner sheet 22I and the outer sheet 22O of the gather sheet 22 are folded back outward at the waist end to form the folded part 90, and a form in which both the inner sheet 22I and the outer sheet 22O of the gather sheet 22 are not folded back. You can also do it. However, in either form, the part of the gather sheet 22 adjacent to the side of the absorbent element 49 or the part located inside the absorbent element 49 where the three-dimensional gathers BG is collapsed is made so that the folded part 90 is not formed. It is preferable to do so.

As the gather elastic member 16, commonly used materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, and polyester can be used. Further, in order to make it difficult to see from the outside, it is preferable that the thickness be 925 dtex or less, the tension be 150 to 350%, and the interval be 7.0 mm or less. As the gather elastic member 16, in addition to the string shape as shown in the figure, a tape shape having a certain width can also be used.

Similar to the top sheet 11, the material fibers constituting the aforementioned gather sheet 22 include synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupro, and natural fibers such as cotton. Nonwoven fabrics obtained by appropriate processing methods such as spunbond method, thermal bonding method, melt blown method, needle punching method, etc. can be used. It is better to use a non-woven fabric with excellent air permeability. Furthermore, the gather sheet 22 is made of silicone-based, paraffin metal-based, and alkylchromic chloride-based water repellents in order to prevent the permeation of urine, etc., prevent rashes, and improve the feel (dry feeling) on the skin. It is desirable to use a water-repellent nonwoven fabric coated with.

(Example of structure of exterior body)
As shown in FIGS. 3 and 4, the exterior body 19 has a two-layer structure consisting of an elastic sheet 23 and a back sheet 20, each of which is made of an elastic nonwoven fabric or the like. In the thickness direction TD, between the gather sheet 22 (outer gather sheet 22O in FIG. 3) and the back sheet 20, and in the front-rear direction LD, between the folding point 92 of the waist end W of the gather sheet 22 and the elastic sheet 23. A book elastic member 24 is provided, and the elastic member 24 expands and contracts, thereby imparting elasticity to the waist end W. Further, as shown in FIG. 1, the planar shape as a whole has a substantially hourglass shape due to concave leg circumferential lines 29 formed on both sides of the middle to form leg openings.

As shown in FIGS. 1 to 4, the exterior body 19 in the illustrated form includes a plurality of waists arranged along the width direction WD at intervals in the front-rear direction LD and arranged at the waist end W, as shown in FIGS. 1 to 4. It includes an elastic member 24 and an elastic sheet 23 disposed entirely between the waist end W of the front body F and the waist end W of the rear body B.
(Waist elastic member 24)

The waist elastic member 24 is a plurality of rubber threads or the like arranged at intervals in the vertical direction near the edge of the waist opening within the range of the side seal part 21 where the front body F and the back body B are joined. This is a long and narrow elastic member that applies elastic force to tighten the diaper around the body's torso to attach the diaper to the body. The waist elastic member 24 uses thread rubber in the illustrated example, but may also be made of a tape-like elastic member, for example.

(Stretchable sheet 23)
The elastic sheet 23 applies elastic force in the width direction WD to the waist circumference portions of the front body F and the back body B, respectively, and brings the diaper into close contact with the body. Note that the boundary between the waist elastic member 24 and the elastic sheet 23 does not necessarily have to be clear. For example, an overlapping portion may be provided between the waist elastic member 24 and the elastic sheet 23.

The stretchable sheet 23 is not particularly limited, but may be an elastic film such as a thermoplastic resin sheet having elasticity itself, or a stretchable nonwoven fabric. By using a stretchable nonwoven fabric, wrinkles are less likely to occur on the surface of the diaper. As a result, the appearance can be approximated to that of underwear, and it is also possible to prevent the appearance of wrinkles from the diaper on outerwear such as pants. Moreover, as the elastic sheet 23, in addition to a non-porous sheet, a sheet with many holes or slits formed therein for ventilation can be used. In particular, the tensile strength in the width direction WD (stretching direction ED, MD direction) is 8 to 25 N/35 mm, the tensile strength in the front-rear direction LD (direction XD, CD perpendicular to the stretching direction) is 5 to 20 N/35 mm, and the tensile strength in the width direction is 5 to 20 N/35 mm. It is preferable that the elastic sheet has a tensile elongation in the WD of 450 to 1050% and a tensile elongation in the longitudinal direction LD of 450 to 1400%. The thickness of the elastic sheet 23 is not particularly limited, but is preferably about 20 to 40 μm. Further, as the elastic sheet 23, a nonwoven fabric sheet having a two-layer structure or a multi-layer structure can also be used. In this nonwoven fabric sheet, an elongated elastic elastic member is sandwiched between arbitrary sheets constituting the nonwoven fabric sheet, and the entire nonwoven fabric sheet can be expanded and contracted by the elastic action of this elongated elastic elastic member. . In addition, when using the stretchable sheet 23 sandwiching an elongated elastic stretchable member, it is preferable to arrange folded parts 90 and the like on the outside of the stretchable sheet 23 so that wrinkles etc. do not appear on the outside when contracted.

In addition, after the elastic sheets 23 arranged in the front body F and the back body B are continuously fixed to the back sheet 20 during manufacturing, the portions overlapping with the absorbent body 17 are made non-contractable portions where no contractile force acts, A portion other than this non-contractable portion can be a contracted portion on which a contracting force acts. Thereby, unnecessary contraction of the absorber 17 can be prevented.

(Abdominal leakage prevention sheet 50 and back leakage prevention sheet 60)
As shown in FIG. 3, etc., an abdominal leak prevention sheet 50 is provided to cover the front and rear ends of the interior body 10 attached to the inner surface of the exterior body 19 and to prevent leakage from the front and rear edges of the interior body 10. , a back leak prevention sheet 60 may be provided. To explain the illustrated embodiment in more detail, the abdominal leakage prevention sheet 50 extends from a position overlapping the front end of the interior body 10 toward the abdomen, is folded back outward at the waist edge, and has its tip end on the back sheet 20. It is designed to cover the outer surface of the ventral side. Similarly, the back leak prevention sheet 60 extends to the back side from a position overlapping the rear end of the interior body 10, is folded back outward at the waist edge, and its tip portion touches the outer surface of the back side of the back sheet 20. It is designed to cover. Although the belly leak prevention sheet 50 and the back leak prevention sheet 60 in FIGS. 1 to 4 extend over the entire width direction WD of the exterior body 19, they do not necessarily need to extend over the entire width direction WD.

(Back sheet 20)
The back sheet 11 is preferably liquid-impermeable, and the material for this purpose is not particularly limited, but examples include a plastic film made of olefin resin such as polyethylene and polypropylene, and a non-woven fabric with plastic on the surface. Examples include a laminated nonwoven fabric provided with a film, and a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to a plastic film. For the back sheet 11, it is preferable to use a liquid-impermeable and moisture-permeable material, which has been used favorably in recent years from the viewpoint of preventing stuffiness. Moisture-permeable plastic films include microporous plastic films obtained by kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching it uniaxially or biaxially. is widely used. Other methods include non-woven fabrics using micro-denier fibers, strengthening leak-proofing by reducing fiber pores by applying heat and pressure, and coating with super absorbent resins, hydrophobic resins, and water repellents. Therefore, a liquid-impermeable sheet without using a plastic film can also be used as the back sheet 11.

The backsheet 11 shown in FIG. 3 extends to the waist side end W (ventral waist side end W and dorsal waist side end W) of the exterior body 19 in the front-rear direction LD, and then is folded back to the outside. It is configured to cover the ventral outer surface and the dorsal outer surface of the back sheet 11. Of course, it is not limited to this type of form.

(intermediate sheet)
Although not shown, in order to quickly transfer the liquid that has permeated through the top sheet 11 to the absorbent body, an intermediate sheet (" A second seat (also called a second seat) may be provided. This intermediate sheet not only quickly transfers the liquid to the absorber and improves the absorption performance of the absorber, but also prevents the absorbed liquid from returning from the absorber and keeps the top sheet 11 dry at all times. It can be a state. Of course, this intermediate sheet may not be provided.

Examples of the intermediate sheet include the same material as the top sheet 11, spunlace, spunbond, SMS, pulp nonwoven fabric, pulp and rayon mixed sheet, point bond, or crepe paper. In particular, air-through nonwoven fabrics are preferred because they are bulky. It is preferable to use a composite fiber with a core-sheath structure for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) with high rigidity is preferable. The basis weight is preferably 20 to 80 g/m ² , more preferably 25 to 60 g/m ² . The thickness of the raw material fibers of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers whose core is not in the center, hollow fibers, or eccentric and hollow fibers as the mixed fibers for all or part of the raw material fibers.

The intermediate sheet may be shorter than the width of the absorbent core 17 and placed in the center, or may be provided over the entire width of the absorbent core 17. The length in the longitudinal direction of the intermediate sheet may be the same as the length of the absorber 17, or may be within a short length range centered on the liquid receiving area.

(Folding part 90)
In the diaper shown in FIGS. 1 to 4, three sheets, the abdominal leak prevention sheet 50, the gather sheet 22 (more specifically, the outer sheet 22O of the gather sheet 22), and the back sheet 20, which constitute the front body F, are on the ventral side. The waist end W of the back seat 20 is folded back to the outside at the waist end W, and covers the outer surface of the ventral side FS of the back sheet 20. Similarly, three sheets, the back leak prevention sheet 60, the gathered sheet 22 (more specifically, the outer sheet 22O of the gathered sheets 22), and the back sheet 20 that make up the back body B, are attached to the waist of the waist end W on the back side. It is folded back outward at the end and covers the outer surface of the back side BS of the back sheet 20.

The unfolded portions of these sheets 50 (60), 22, and 20 are referred to as non-folded portions 91, the folded portions are referred to as folded portions 90, and the folded portions between the non-folded portions 91 and the folded portions 90. This is called the turning point 92.

Further, in the folded portion 90, the sheet located at the outermost side OS in the thickness direction TD is referred to as a first sheet S1, and from there inward, they are referred to as a second sheet S2 and a third sheet S3. In the embodiment of FIG. 3, the first sheet S1 of the front body F is the abdominal leak prevention sheet 50, the second sheet S2 is the gathered sheet 22 (more specifically, the outer sheet 22O), and the third sheet S3 is the back sheet 20. It is. Further, the first sheet S1 of the back body B is the back leak prevention sheet 60, the second sheet S2 is the gathered sheet 22 (more specifically, the outer sheet 22O), and the third sheet S3 is the back sheet 20.

As shown in FIG. 3 and the like, the folded portion 90 covers the outside of the waist elastic member 24 disposed at the waist end W. With this configuration, the waist elastic stretch member 24 is hidden by the folded portion 90 and cannot be visually recognized from the outside. As a result, in the product state, it is difficult to give consumers the impression that the tightening force at the waist end W is strong, and it is possible to prevent a decrease in purchasing desire caused by associations of discomfort when worn.

(Number of folded sheets)
As described above, in the embodiment shown in FIG. 3, three sheets are folded back in each of the front body F and the back body B, but the number of folded sheets is not particularly limited and can be changed as appropriate. For example, as shown in FIG. 11 (11A), a total of two sheets, the abdominal leak prevention sheet 50 and the gathered sheet 22 (specifically, the outer sheet 22O of the gathered sheets 22) constituting the front body F, are folded back. Alternatively, as shown in FIG. 11 (11B), only the abdominal leak prevention sheet 50 forming the front body F may be folded back. Further, the inner sheet, back sheet 12, intermediate sheet, etc. of the gather sheet 22 may also be folded back, so that the number of folded sheets is four or more. The same applies to the back body B, and the number of folded pieces is not limited to three, but may be one, two, or four or more.

(Folding of front and back body)
Further, in the embodiment shown in FIG. 3, the folded portions 90 are provided on both the front body F and the back body B, but the folded portions 90 may be formed only on either one of the front body F or the back body B. good. That is, the folded part 90 may be formed on at least one of the front body part F and the back body part B, and the folded part 90 may hide the waist elastic elastic member 24. In addition, when forming the folded part 90 on at least one of the front body part F and the back body part B, it is preferable to provide the folded part 90 in the front body part F. This is because consumers and caregivers spend more time looking at the front body F of the diaper than at the back body B.

(sheet length)
As shown in (5A) of FIG. 5, the length of the sheet forming the folded portion 90 in the front-rear direction LD is not particularly limited. For example, the distance A1 from the folding point 92 of the first sheet S1 (abdominal leak prevention sheet 50) to the tip of the first sheet S1 of the folding part 90 is preferably 20 to 50 mm, and preferably about 25 to 30 mm. More preferred. The distance A2 from the folding point 92 of the second sheet S2 (outer sheet 22O of the gathered sheet 22) to the tip of the second sheet S2 at the folding part 90 is preferably about 25 to 55 mm, and preferably about 40 to 45 mm. is more preferable. The distance A3 from the folding point 92 of the third sheet S3 (back sheet 20) to the tip of the third sheet S3 of the folding portion 90 is preferably about 50 to 60 mm, more preferably about 55 to 60 mm. Regarding each of the distances A1, A2, and A3, it is preferable that distance A2 be longer than distance A1, and distance A3 be longer than distance A2. By setting the relative lengths of the distances A1, A2, and A3 as described above, when the diaper 1 is viewed from the front, the groin side edge of the first sheet S1 is located closer to the crotch side in the front-back direction. The second sheet S2 can be visually recognized, and the third sheet S3 can be seen on the crotch side in the front-rear direction WD from the crotch side edge of the second sheet S2, giving an impression as if there is a frill. I can do it. Note that the distance B1 from the tip of the first sheet S1 to the tip of the second sheet S2 and the distance B2 from the tip of the second sheet S2 to the tip of the third sheet S3 are preferably about 5 to 20 mm, respectively. It is more preferable to set it to about 10 to 15 mm.

In this way, when the folded part 90 is composed of a plurality of sheets, by making the length of the inner sheet of the folded part 90 in the front-rear direction LD longer than the length of the outer sheet in the front-rear direction LD, the waist part When the sheets constituting 90 are overlapped, the waist end W can have an appearance that looks as if it has a frill. As a result, it is possible to arouse the desire to purchase, especially among female consumers. Furthermore, by setting the distances A1 to A3, B1, and B2 to the values described above, the appearance can be made beautiful.

(Sheet density)
When the folded part 90 is composed of a plurality of sheets, among the plurality of sheets constituting the folded part 90, the color density of the sheet located on the inner side IS in the thickness direction TD is determined by the color density of the sheet located on the outer side OS. It is preferable to make it darker than the concentration. For example, in the embodiment of FIG. 3, the density of the third sheet S3 (back sheet 20) is made darker than the density of the second sheet S2 (gathered sheet 22), and the density of the second sheet S2 (gathered sheet 22) is made darker than that of the second sheet S2 (gathered sheet 22). It is preferable to make the concentration higher than that of one sheet S1 (abdominal leakage prevention sheet 50 and back leakage prevention sheet 60). With this configuration, when the diaper is viewed from the front, it is possible to create a sense of depth in the sheets S1, S2, and S3 that make up the folded portion 90, thereby further arousing the consumer's desire to purchase. I can do it.

(hue wheel)
When the folded portion 90 is composed of a plurality of sheets, it is preferable that the colors of adjacent sheets among the plurality of sheets constituting the folded portion 90 be the same color or similar color on the color wheel. For example, in the embodiment of FIG. 3, the color of the third sheet S3 (back sheet 20) is green, the color of the second sheet S2 (gathered sheet 22) is yellow-green (a color similar to green), and the color of the first sheet S1 It is preferable that the color of (the abdominal leak prevention sheet 50 and the back leak prevention sheet 60) be yellow (a color similar to yellow-green). Alternatively, the sheets S1, S2, and S3 may all be green (same color). Although there are various types of color wheels, it is most preferable to use the Munsell color wheel, but other color wheels such as the Ostwald color wheel or the PCCS color wheel may also be used. Specifically, the above-mentioned "approximate colors on the color wheel" are, for example, five basic hues: R (red), Y (yellow), G (green), B (blue), and P (purple), which are equally spaced clockwise. YR (yellow red) between R (red) and Y (yellow), GY (yellow green) between Y (yellow) and G (green), G (green) and B (blue ), PB (blue-purple) between B (blue) and P (purple), and RP (red-purple) between P (purple) and R (red). , refers to the colors that belong to the two main hues located on both sides of the main hue in the Munsell color wheel, which consists of a total of 10 main hues.

If the colors of the sheets S1, S2, and S3 constituting the folded portion 90 are, for example, opposite colors on the color wheel, the color of the overlapping portion of the sheets S1, S2, and S3 tends to look muddy and dirty. In particular, when the sheets S1, S2, and S3 forming the folded portion 90 are highly transparent (for example, the sheets are thin or have many voids in them), such The defect is noticeable. Therefore, as described above, by setting the colors of the sheets S1, S2, and S3 that make up the folded portion 90 to be the same color or similar color on the color wheel, when the sheets S1, S2, and S3 are overlapped, the colors are beautiful. This can increase the consumer's desire to purchase.

(Folding of the tip)
As shown in FIG. 5 (5B), the leading ends of the sheets S1, S2, and S3 forming the folded portion 90 may be further folded inward. That is, as shown in FIG. 5 (5A), when the leading ends of the sheets S1, S2, and S3 constituting the folded part 90 are not folded back, the number of stacked sheets in the thickness direction TD of the folded part 90 is three; As shown in FIG. 5 (5B), by folding the leading ends of the sheets S1, S2, and S3 constituting the folded part 90 inside each sheet S1, S2, and S3, the number of stacked sheets in the thickness direction TD of the folded part 90 is The number of sheets becomes six, and the number of laminated sheets can be increased.

In this way, by folding back the leading ends of the sheets S1, S2, and S3 constituting the folded portion 90 inside each sheet S1, S2, and S3, the waist elastic elastic member 24 itself provided at the waist end W, There is an advantage that the wrinkles caused by the waist elastic stretchable member 24 on the sheets 20, 22, and 50 of the non-folded portion 91 are less easily recognized. In addition, if the number of laminated sheets S1, S2, and S3 of the folded part 90 provided at the waist end W is large, when the consumer touches the folded part 90 when wearing the product, the consumer is likely to feel a soft touch, and the consumption It can give people a pleasant feeling.

Note that when folding the leading ends of the sheets S1, S2, and S3 constituting the folding section 90 to the inside of each sheet S1, S2, and S3, the sheets S1, S2, and S3 are stacked and then bundled and folded back. It is preferable not to have any. In this way, when the sheets S1, S2, and S3 are bundled and folded in a stacked state, in the thickness direction, from the outer OS to the inner IS, the first sheet main body part S1A, the second sheet main body part S2A, The third sheet main body portion S3A, the third sheet leading end portion S3B, the second sheet leading end portion S2B, and the first sheet leading end portion S1B overlap in this order. In such a case, the waist elastic elastic member 24 itself and the wrinkles caused by the waist elastic elastic member 24 on the sheets 20, 22, and 50 of the non-folded portion 91 are less likely to be visually recognized, but the consumption When a consumer touches the folded portion 90 while wearing the product, it is difficult to feel a soft touch, making it difficult to provide a comfortable sensation to the consumer. Therefore, when folding back the leading ends of the sheets S1, S2, and S3 constituting the folding section 90 to the inside of each sheet S1, S2, and S3, it is preferable to fold each of the sheets S1, S2, and S3 one by one. . In this way, when each of the sheets S1, S2, and S3 is folded back one by one, as shown in FIG. The first sheet leading end portion S1B, second sheet main body portion S2A, second sheet leading end portion S2B, third sheet main body portion S3A, and third sheet leading end portion S3B overlap in this order. Note that the symbol "R2" in FIG. 5 (5B) indicates the point at which each of the sheets S1, S2, and S3 is folded back toward the inner IS (second folding point), and the symbol "R1" indicates the abdominal leak prevention sheet 50, Back leak prevention sheet 60. It shows the point where the gathered sheet 22 and the back sheet 20 are folded back toward the outer OS (first folding point). This first turning point R1 has the same meaning as the point indicated by the reference numeral 92 in FIG. That's what it means.

Note that, as shown in FIG. 5 (5B), even when the leading ends of the sheets S1, S2, and S3 constituting the folded portion 90 are folded back to the inside IS of each sheet S1, S2, and S3, the first The second folding point R2 of the second sheet S2 is located closer to the center in the longitudinal direction than the second folding point R2 of the second sheet S1, and the second folding point R2 of the third sheet S2 is positioned closer to the center in the longitudinal direction than the second folding point R2 of the second sheet S2. It is preferable that R2 be located on the center side in the front-rear direction. With this configuration, when the diaper is viewed from the front, not only the first sheet S1 but also the second sheet S2 and third sheet S3 can be seen, giving the impression that there are frills. This can increase purchasing motivation, especially among female consumers.

(Modified example of the position of the waist elastic elastic member 24)
The waist elastic elastic member 24 may be provided at the folded portion 90. However, when providing the waist elastic elastic member 24 in the folded part 90, it is not provided between the first sheet S1 located at the outermost side of the folded part 90 and the second sheet S2 located next to the outer side, and the waist elastic elastic member 24 is It is preferable to provide it between S2 and the outermost sheet (for example, the back sheet 20 in the embodiment shown in FIG. 3) of the sheets constituting the non-folded portion 91.

Specifically, as shown in (6A) of FIG. 6, the waist elastic stretch member 24 is provided between the non-folded part 91 and the folded part 90 of the backsheet 20, or as shown in (6B) of FIG. , a part of the waist elastic elastic member 24 is provided between the non-folded part 91 and the folded part 90 of the backsheet 20, and a part of the waist elastic elastic member 24 is provided between the second sheet S2 and the third sheet S3 of the folded part 90. A portion may be provided. In addition, although not shown, all the waist elastic elastic members 24 may be provided between the second sheet S2 and the third sheet S3 of the folded portion 90.

When the waist elastic stretchable member 24 is provided between the second sheet S2 of the folded portion 90 and the outermost sheet of the sheets constituting the non-folded portion 91, the waist elastic stretchable member 24 contracts and folds back. This makes it easier to create a wavy shape at the tip of the sheet that makes up the product, and the wavy shape creates a soft appearance and cuteness, thereby increasing the product's appeal. Moreover, by configuring the waist elastic elastic member 24 not to be provided between the first sheet S1 and the second sheet S2, wrinkles caused by contraction of the waist elastic elastic member 24 can be covered up by the first sheet. , it is difficult to give consumers the impression that the system is too restrictive. For example, FIG. 10 is a perspective view of the diaper according to the present invention when worn, and the cross-sectional structure of the ventral side of this diaper is as shown in FIG. 6 (6B). A part of the waist elastic elastic member 24 is provided between the non-folded part 91 and the folded part 90 of the backsheet 20, and a part of the waist elastic elastic member 24 is provided between the second sheet S2 and the third sheet S3 of the folded part 90. By providing the waist elastic stretch member 24, a wavy shape is generated at the leading ends of the second sheet S2 and the third sheet S3, creating a soft appearance and cuteness. On the other hand, since the waist elastic elastic member 24 is not provided between the first sheet S1 and the second sheet S2, no wavy shape is generated at the leading end of the first sheet S1, but the waist elastic elastic member 24 and It hides the wrinkles around it (makes them invisible from the outside). In addition, in FIG. 10, parts that cannot be visually recognized from the outside are shown by dotted lines, and the waist elastic elastic member 24 is also shown by dotted lines because it cannot be seen from the outside.

(A mode in which the folded portion 90 is not side sealed)
In the side seal portion 21, it is preferable that the folded portions 90 are not joined to both sides of the front body F and both sides of the back body B.

With this configuration, the number of sheets to be side-sealed in the side-sealing portion 21 is reduced, making side-sealing easier during manufacturing. Furthermore, as the number of sheets to be side-sealed increases, the sealing needs to be made stronger. The stronger the seal, the more difficult it will be for the consumer to tear the side seal when tearing it off after using the diaper. By not joining the folded parts 90 to both sides of the front body F and both sides of the back body B as in this embodiment, the number of sheets to be side-sealed is reduced, making it easier to tear the side seals.

Furthermore, since the diaper shown in FIG. 10 has frills, it is a product in which the number of laminated sheets of the side seal portion 21 changes frequently in the front-rear direction LD. Therefore, when a consumer tears the side seal after using such a frill-shaped disposable diaper, horizontal tearing is likely to occur at the portion where the number of laminated sheets changes. As in this embodiment, by not joining the folded parts 90 to both sides of the front body F and both sides of the back body B, the number of sheets to be side-sealed is reduced, so the occurrence of such horizontal tearing can be suppressed. .

Specifically, as shown in FIG. 7 (7A), the side seal portions 21 are formed by side sealing both sides in the width direction WD of the non-folded portion 91 of the diaper. At this time, both sides of the diaper folded portion 90 in the width direction WD are not side sealed. Thereafter, as shown in FIGS. 7A and 7B, the folded portion 90 is folded back toward the outside OS in the thickness direction TD, and the folded portion 90 is placed over the side seal portion 21. By adopting such a configuration, the various effects described above can be obtained. Furthermore, when a consumer looks at the side seal part 21, the consumer tends to feel that the side seal part 21 looks hard. It can soften the impression. FIG. 7 (7C) shows a cross-sectional view taken along line XX in FIG. 7 (7B).

(A mode in which the folded part 90 does not cover the side seal part 21)
The folded portion 90 may not cover the side seal portion 21. Since this aspect also does not side-seal the folded portion 90, it is possible to obtain the same effect as the above-mentioned “aspect in which the folded portion 90 is not side-sealed”.

In addition, when manufacturing a diaper as shown in FIGS. 7A and 7B described above, before folding back the folded portion 90, both sides of the front body F and both sides of the back body B are joined in advance to form a side seal. The portion 21 is formed, and then the folded portion 90 is folded back. However, during manufacturing, the Belcoton bear carrying the diaper is moving at high speed, so sealing only the non-folded portion 91 without sealing the folded portion 90 does not make positioning easy.

If the folded portion 90 does not overlap the side seal portion 21, the above-mentioned positioning during manufacturing becomes unnecessary, and manufacturing of the diaper becomes easier.

As a mode in which the folded part 90 does not overlap the side seal part 21, for example, as shown in FIG. A method of providing a notch 95) can be mentioned. In order to prevent the folded portion 90 from overlapping the side seal portion 21, the width F3 of the notch portion 95 needs to be longer than the width F4 of the side seal portion. Specifically, the width F3 of the notch 95 is preferably about 10 to 30 mm, more preferably about 15 to 20 mm. Further, the width F4 of the side seal portion is preferably about 5 to 20 mm, more preferably about 10 to 15 mm. The width F3 of the cutout portion 95 is preferably about 10 to 20 mm longer than the width F4 of the side seal portion, and more preferably about 10 to 15 mm longer. If the difference between the width F3 of the notch portion 95 and the width F4 of the side seal portion is longer than 20 mm, there is a problem that the area of the notch portion 95 becomes large and the amount of dust increases when manufacturing the diaper. . Furthermore, the length of the folded portion 90 in the width direction WD becomes shorter, making it difficult to hide the waist elastic elastic member 24 by the folded portion 90. On the other hand, if the difference between the width F3 of the notch part 95 and the width F4 of the side seal part is less than 10 mm, the location of the notch will only change slightly because the Belcoton bear carrying the diaper is moving at high speed during manufacturing. Therefore, there is a possibility that the folded portion 90 and the side seal portion 21 overlap.

In addition, the total width F1 (excluding the leg part) of the front body F (excluding the leg part) and the back body B (excluding the leg part) of the diaper is preferably about 400 to 900 mm, and 500 to 800 mm. It is more preferable to set it as a degree. The total width F2 of the folded portion 90 is preferably about 380 to 880 mm, more preferably about 485 to 785 mm.

Furthermore, although it is preferable that the cutout portions 95 be provided at both ends of the folded portion 90 in the width direction WD, the cutout portions 95 may be provided only at one end portion. Note that it is possible to consider a form in which the cutout portion 95 is provided at a portion other than both ends of the folded portion 90 in the width direction WD (for example, the center portion of the folded portion 90 in the width direction WD); Even if the cutout portion 95 is provided in the portion, it is meaningless because it does not contribute to the effect of preventing the folded portion 90 from overlapping the side seal portion 21. On the contrary, by providing the cutout portion 95 in a portion other than both ends in the width direction WD of the folded portion 90, the waist elastic elastic member 24 and the waist elastic elastic member 24 can be The resulting wrinkles become more visible from the outside. Therefore, it is preferable that the cutout portions 95 be provided only at both ends of the folded portion 90 in the width direction WD, and not provided in an intermediate portion (portion between both ends) of the folded portion 90 in the width direction WD.

(Joining of some sheets of folded part 90)
As shown in FIG. 7 (7C), when there are multiple sheets forming the folded part 90, the best form is not to join all of the sheets to the side seal part 21, but this form is limited. It's not a thing. Note that the joined portion in FIG. 7 (7C) is a portion indicated by the symbol "HM".

For example, in the side seal part 21, the sheet inside the folded part 90 is joined to both sides of the front body F and both sides of the back body B, and the sheet outside the folded part 90 is joined to both sides of the front body F and both sides of the back body B. It may also be configured such that it is not joined to both sides of the back body B.

For example, as shown in FIG. 9, among the three sheets S1, S2, and S3 that make up the folded part 90, both sides of the third sheet S3 located at the innermost IS are used as both sides of the front body F and the back body. The both sides of the first sheet S1 and the second sheet S2, which are joined to both sides of the front body F and are located on the outer side OS than the third sheet S3, are not joined to the both sides of the front body F and the both sides of the back body B. It's okay.

In this way, the mode in which some of the sheets of the folded part 90 are joined is inferior to the mode shown in FIG. 7, but compared to the mode in which all the sheets of the folded part 90 are joined, Since the side seal portion 21 is thin, the difficulty in tearing the side seal portion 21 is suppressed.

INDUSTRIAL APPLICATION This invention can be utilized for the pants type disposable diaper like the above-mentioned example.

DESCRIPTION OF SYMBOLS 1... Pants type disposable diaper, 10... Inner body, 11... Top sheet, 12... Back sheet, 14... Packaging sheet, 16... Gathered elastic member, 17... Absorbent body, 19... Exterior body, 20... Back sheet, 21... Side seal portion, 22... Gathered sheet, 22I... Inner sheet (of the gathered sheet), 22O... Outer sheet (of the gathered sheet), 23... Elastic sheet, 24... Waist elastic elastic member, 29... Leg circumference line, 50... Belly Leak prevention sheet, 60... Back leak prevention sheet, 90... Folded part, 91... Non-folded part, 92... Folded point, 95... Notch part, A1... Length in the front-back direction of the first sheet, A2... Second sheet A3... Length in the longitudinal direction of the third sheet, B1... Length in the longitudinal direction from the tip of the first sheet to the tip of the second sheet, B2... Length in the longitudinal direction from the tip of the second sheet to the tip of the third sheet. Length in the front-back direction to the tip of the sheet, F1...Full width of the front body (excluding the leg part) of the diaper, or full width of the back body B (excluding the leg part), F2...Full width of the folded part, F3... Width of notch, F4...width of side seal part, R1...first folding point, R2...second folding point, S1...first sheet, S2...second sheet, S3...third sheet, S1A...first Seat main body part, S2A...Second seat main body part, S3A ...Third seat main body part, S1B...First seat tip part, S2B...Second seat tip part, S3B...Third seat tip part, LD...Anteroposterior direction, FS...Front side, BS...Back side, WD...Width direction, LS...Left side, RS...Right side, TD...Thickness direction, IS...Inside, OS...Outside, HM...(hot melt) joint part, WO...Waist opening, LO...Leg opening, F...Front body, B...Back body, W...Waist end, U...Girth, BG...3D gathers

Claims (6)

Both sides of the front body and both sides of the back body are joined to form a side seal, and a waist opening and a pair of left and right leg openings are formed.
A pants-type disposable diaper in which a plurality of circumferential waist elastic elastic members are attached to the waist end forming the edge of the waist opening at intervals in the vertical direction,
A sheet constituting at least one of the front body and the back body has a folded part that is folded back outward at the waist end,
the folded portion overlies the waist elastic elastic member;
In the side seal portion, the folded portion is not joined to both sides of the front body and both sides of the back body.
A pants-type disposable diaper characterized by: The pants-type disposable diaper according to claim 1 , wherein the folded portion does not cover the side seal. Both sides of the front body and both sides of the back body are joined to form a side seal, and a waist opening and a pair of left and right leg openings are formed.
A pants-type disposable diaper in which a plurality of circumferential waist elastic elastic members are attached to the waist end forming the edge of the waist opening at intervals in the vertical direction,
A sheet constituting at least one of the front body and the back body has a folded part that is folded back outward at the waist end,
the folded portion overlies the waist elastic elastic member;
The folded portion consists of a plurality of sheets,
In the side seal portion, the inner sheet of the folded part is joined to both sides of the front body and both sides of the back body, and the sheet outside of the folded part is joined to both sides of the front body and the back body. A pants-type disposable diaper characterized by not being joined to both sides of the back body. Both sides of the front body and both sides of the back body are joined to form a side seal, and a waist opening and a pair of left and right leg openings are formed.
A pants-type disposable diaper in which a plurality of circumferential waist elastic elastic members are attached to the waist end forming the edge of the waist opening at intervals in the vertical direction,
A sheet constituting at least one of the front body and the back body has a folded part that is folded back outward at the waist end,
the folded portion overlies the waist elastic elastic member;
The folded portion consists of a plurality of sheets,
The length of the inner sheet of the folded portion in the longitudinal direction is longer than the length of the outer sheet in the longitudinal direction;
A pants-type disposable diaper characterized by: The folded portion consists of a plurality of sheets,
5. The pant-type disposable diaper according to claim 4 , wherein the color density of the inner sheet of the folded portion is darker than the color density of the outer sheet. The folded portion consists of a plurality of sheets,
The pant-type disposable diaper according to claim 4 or 5 , wherein the colors of the adjacent sheets of the folded portion are the same color or similar colors on a color wheel.

Images