JP7290918B2 - disposable absorbent article - Google Patents

Description

TECHNICAL FIELD The present invention relates to a disposable absorbent article in which a non-stretchable region is provided in at least one of an outer body that constitutes a front body and an outer body that constitutes a back body, in a region that does not overlap with an absorbent body.

BACKGROUND ART Techniques have been developed to improve the fit of absorbent articles such as disposable diapers to wearers from the viewpoints of preventing leakage of urine and improving ease of movement.

For example, Patent Document 1 below discloses an invention in which a stretchable film is used to change the width of a non-stretchable region from the crotch side to the waist side, thereby improving fit. In Patent Document 2 below, by arranging an elastic member in a non-stretched state instead of an elastic member in a stretched state in a portion of the outer body that overlaps the inner body, the inner body expands and contracts in the width direction, and the wearer can wear it. Inventions have been disclosed that prevent deterioration of fitness.

JP 2016-185265 A JP 2013-081752 A

However, as the fit of the disposable absorbent article to the wearer improves, the space between the absorbent article and the wearer's skin surface decreases, resulting in lower breathability. As a result, there is a problem that rough skin tends to occur.

As described above, the improvement of fit and the improvement of air permeability are in a trade-off relationship, and it is difficult to improve both at the same time.

Therefore, the main object of the present invention is to provide a disposable absorbent article with improved breathability. A secondary object of the present invention is to provide a disposable absorbent article with improved breathability and improved fit.

The present invention, which has solved the above problems, is as follows.
(1) An exterior body that constitutes a front body and an exterior body that constitutes a back body are separately or integrally provided, and an interior including an absorbent body is provided from the exterior body that constitutes the front body to the exterior body that constitutes the back body. the body is attached,
Both sides of the exterior body forming the front body and both sides of the exterior body forming the back body are respectively joined to form a waist opening and a pair of left and right leg openings,
At least one of the outer body constituting the front body and the outer body constituting the back body has a non-stretchable region provided in at least a part of the range having the absorber and a range not having the absorber. At least a portion of the elastic region has a stretchable region,
The elastic regions are an inner sheet layer, an outer sheet layer, and a plurality of elongated strips attached along the width direction at intervals in the front-rear direction between the inner sheet layer and the outer sheet layer. an elastic expansion/contraction member and a region that elastically expands and contracts in the width direction with expansion and contraction of the elastic expansion/contraction member,
The non-stretchable region has the inner sheet layer and the outer sheet layer continuous from the stretchable region, and an unnecessary elastic stretchable member remaining between the inner sheet layer and the outer sheet layer, and is elastic in the width direction. It is a non-stretchable area,
In the range without the absorber, the non-stretchable region is provided on the absorber side in the width direction of the outer package, and the stretchable region is provided on both side sides in the width direction of the outer package. ,
A disposable absorbent article, wherein at least a portion of the non-stretchable region in a region not having the absorbent body is provided with a through-hole penetrating through at least one of the inner sheet layer and the outer sheet layer.

(Effect)
In at least one of the outer body constituting the front body and the outer body constituting the back body, a through hole is provided in a range that does not have the absorber (that is, a range that does not overlap with the absorber; hereinafter the same). Therefore, the air permeability can be improved. The through-holes penetrate through at least one of the inner sheet layer and the outer sheet layer. If the through-holes penetrate through both the inner sheet layer and the outer sheet layer, the breathability can be further improved.

In addition, by providing a non-stretchable region that does not contract on the absorber side in the width direction of the exterior body in the range where the exterior body does not have the absorber, the width direction edge of the absorber is separated from the exterior body and easily rises. The fit of the absorbent body to the wearer is improved. Furthermore, since the non-stretchable region does not shrink, it is possible to prevent the widthwise end portions of the absorbent body from shrinking inward in the widthwise direction, compared to the case where the non-stretchable region is not provided. As a result, it is possible to increase the area of the absorber that covers the wearer's skin surface, thereby improving fit.

(2) The disposable absorbent article according to (1), wherein the through-hole is a cut trace of the elastic stretchable member.

(Effect)
As a method of providing the non-stretchable region, a method of pressing a cutter or the like to cut the elastic stretchable member can be mentioned. If through holes are provided in at least one of the inner sheet layer and the outer sheet layer at the same time that the elastic stretchable member is cut by the cutter or the like, the manufacturing process can be simplified and the manufacturing time can be shortened.

(3) The length in the width direction of the non-stretchable region provided in the range not having the absorber of the outer packaging is
The disposable absorbent article according to (1), wherein the lower end portion of the waist region of the outer body is long, and the lower end portion becomes shorter toward at least one of the waist side and the crotch side of the outer body.

(Effect)
In general, the waist-side end of the cleft of the wearer's buttocks (that is, the top of the buttocks; hereinafter the same) is often positioned on the lower end of the waist region of the outer body that constitutes the back body. Since the top portion of the wearer's buttocks is the portion where the perimeter of the buttocks is the longest, it is preferable to maintain the width of the absorber in this portion to be the widest. Therefore, in the present invention, at the lower end of the waist region of at least one of the outer body of the front body and the outer body of the back body, the length of the non-stretchable region in the width direction is increased, and the absorbent body located at the lower end It is configured to further prevent contraction inward in the width direction. Preferably, the length in the width direction of the non-stretchable region provided in the region of the outer covering of the back body that does not have the absorber is changed as described in (3) above.

On the other hand, since the vicinity of the waist-side end of the absorber is far from the urination opening, it is difficult for urine to reach there. At the same time, if the shrinkage of the waist-side end portion is gradual, the upper end portion of the absorbent article tends to roll up, and as a result, the absorbent article tends to slide down. Therefore, the length of the width of the non-stretchable region is shortened from the lower end of the waist region toward the waist.

In addition, since the crotch part side of the absorbent body is pinched by the wearer's legs and contracts, there is little need to intentionally provide a non-stretchable region in the outer body. Also, the circumference of the buttocks is shorter than that of the top of the buttocks. Therefore, the length of the width of the non-stretchable region is made shorter from the lower end portion of the waist region toward the crotch portion.

The length of the non-stretchable region in the width direction gradually shortens from the lower end of the waist region of the outer body, which constitutes the back body, toward at least one of the waist side and the crotch side of the outer body. It includes a form, a form in which the width is gradually shortened, and a form in which the width is partially lengthened, but the width is shortened as a whole. A gradual change in the length of the width of the non-stretchable region has the advantage of being easier to manufacture than an abrupt change.

(4) At the lower end of the waist region of the outer body,
The total length in the width direction of the non-stretchable region in the range not having the absorber of the outer package is 30% to 50% of the total length in the width direction of the range not having the absorber in the outer package (1 ) disposable absorbent article.

(Effect)
If the total length in the width direction of the non-stretchable region is shorter than 30%, the effect of improving the fit of the absorbent body is reduced. On the other hand, if the total length of the non-stretchable region in the width direction is longer than 50%, the absorbent article tends to slide down. Therefore, the total length of the non-stretchable region in the width direction is preferably about 30% to 50% of the total length of the width direction of the area of the outer covering that does not have the absorber.

(5) In one of the outer body constituting the front body and the outer body constituting the back body,
The length in the width direction of the non-stretchable region provided in the range not having the absorber of the exterior body is
a lower end portion of the waist region of the outer body is long and gradually becomes shorter from the lower end portion toward the waist side of the outer body;
In the other exterior body that constitutes the front body and the exterior body that constitutes the back body,
The length in the width direction of the non-stretchable region provided in the exterior body is
The disposable absorbent article according to (1), wherein the absorbent body has a long waist-side end and gradually becomes shorter from the waist-side end toward the crotch.

(Effect)
In either one of the outer body constituting the front body and the outer body constituting the back body, if the length in the width direction of the non-stretchable region at the lower end of the waist region is increased, in the circumferential direction of the lower end There is a problem that the tightening force is weakened.

In order to solve this problem, in the outer body constituting the front body and the outer body constituting the back body, the length in the width direction of the non-stretchable region connected to the lower end portion in the circumferential direction is shortened. . As a result, it is possible to prevent a decrease in tightening force.

Further, in either one of the outer body constituting the front body and the outer body constituting the back body, the length in the width direction of the non-stretchable region provided in the range where the outer body does not have the absorber is It gradually becomes shorter toward the waist side end of the absorbent body. Therefore, the tightening force becomes stronger toward the waist side of the diaper.

In a disposable absorbent article, if the tightening force is not changed from the waist side to the crotch side as much as possible, the wearing comfort is improved. In order to obtain such an effect, in the outer body constituting the front body and the outer body constituting the back body, the length in the width direction of the non-stretchable region provided in the outer body is set to the waist side. It was made longer at the ends and gradually shortened from there toward the crotch.

For example, when the width of the non-stretchable region is increased at the lower end of the waist region of the outer body that constitutes the back body, the width of the non-stretchable region at the lower end of the waist region of the outer body that constitutes the front body is shorten the length of In addition, when the length of the width of the non-stretchable region is made to decrease from the lower end of the waist region of the outer body forming the back body toward the waist side, the lower end of the waist region of the outer body forming the front body The length of the width of the non-stretchable area is lengthened from the part toward the waist. Furthermore, when the length of the width of the non-stretchable region is reduced from the lower end of the waist region of the outer body forming the back body toward the crotch side, the lower end of the waist region of the outer body forming the front body The length of the width of the non-stretchable region is shortened from the part to the crotch side.

In the above case, the length in the width direction of the non-stretchable region in the circumferential direction of the absorbent article (the length of the width of the non-stretchable region provided on the front body and the length of the width of the non-stretchable region on the back body) It is preferable that the total value) has approximately the same length (constant length) at any point in the front-rear direction from the waist side to the crotch side of the absorbent article. Here, the term “almost the same length” means that the total value is the same at any different point in the front-rear direction from the waist side to the crotch side of the absorbent article, or there is a slight difference in the total value. Including cases where The difference in the total value is preferably within the range of about 10 mm, more preferably within the range of about 5 mm.

(6) a design sheet having a design applied to at least one of the front exterior body and the rear exterior body;
The disposable absorbent article according to (1), wherein the area provided with the design sheet overlaps the area provided with the through holes.

(Effect)
If a through-hole is provided in a portion of the outer body that does not overlap with the inner body, the wearer's skin is directly exposed to the outside air. There is a problem that it is likely to be felt. Moreover, since the wearer's skin is visible from the outside, there is a problem that the appearance is not good. Furthermore, since the strength of the exterior body is lowered, there is also a problem that it is easily torn when worn.

Therefore, by providing a design sheet as in the present invention, it is possible to reduce the discomfort caused by the influence of the outside air, improve the appearance, and improve the strength of the exterior body. In addition, by covering the through-holes with a design sheet on which a character pattern or the like is applied to the absorbent article, an increase in the number of materials can be suppressed compared to the case where a sheet used only to cover the through-holes is provided. be able to.

(7) the elastic stretchable member is cut into a plurality of pieces in the non-stretchable region;
The cut elastic stretchable member is fixed to at least one sheet layer of the inner sheet layer and the outer sheet layer,
A through hole is provided in the sheet layer to which the cut elastic stretchable member is fixed,
The disposable absorbent article according to (1) above, wherein the contraction of the cut elastic stretchable member causes the sheet layer to contract, thereby widening the through hole.

(Effect)
Contraction of the cut elastic stretchable member expands the width of the through-hole, which has the effect of improving air permeability.

In the non-stretchable region, when the elastic stretchable member is not fixed, the elastic stretchable member is drawn to the outermost widthwise outside of the non-stretchable region regardless of the cut position of the elastic stretchable member. Therefore, in such a case, although there is no effect of widening the through-holes as described above, the stretchability of the non-stretchable region is almost only the stretchability of the nonwoven fabric itself, so the fit on the buttocks can be improved.

As described above, according to the present invention, it is possible to provide a disposable absorbent article with improved breathability. In addition, it is possible to provide a disposable absorbent article with improved breathability and improved fit.

FIG. 4 is an unfolded plan view showing the inner surface of the pants-type disposable diaper. Fig. 2 is an unfolded plan view showing the outer surface of the pants-type disposable diaper; 3 is a cross-sectional view taken along line 3-3 of FIG. 1; FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 1; FIG. (a) 5-5 cross-sectional view of FIG. 1, and (b) 6-6 cross-sectional view of FIG. 1 is a perspective view of a pants-type disposable diaper; FIG. Fig. 2 is an unfolded plan view showing the outer surface of the pants-type disposable diaper; (a) 5-5 cross-sectional view of FIG. 7, and (b) 6-6 cross-sectional view of FIG. It is a top view which shows the formation method of a non-stretchable area|region.

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the absorbent article 1 according to the present invention will be described below with reference to the drawings. The following description and drawings merely show examples of embodiments of the present invention, and the content of the present invention should not be construed as being limited to these embodiments.

<Example of pants-type disposable diaper>
1 to 6 show an example of a pants-type disposable diaper. This pants-type disposable diaper includes a front outer body 12F that constitutes at least the waist circumference of the front body F, a rear outer body 12B that constitutes at least the waist circumference of the back body B, and a front outer body 12F through the crotch. and an interior body 200 provided on the exterior bodies 12F and 12B so as to extend to the rear exterior body 12B, and both sides of the front exterior body 12F and both sides of the rear exterior body 12B are joined together. By forming the side seal portions 12A, the openings formed by the front and rear end portions of the exterior bodies 12F and 12B become waist openings through which the wearer's torso passes, and the exterior bodies 12F and 12B are formed on both sides in the width direction of the interior body 200. Portions surrounded by the lower edge and the side edges of the inner body 200 form leg openings through which the legs pass. The inner body 200 is a part that absorbs and holds excrement such as urine, and the outer bodies 12F and 12B are parts that support the inner body 200 against the wearer's body. Symbol Y indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening of the front body F to the edge of the waist opening of the back body B), and the symbol X indicates the total width of the diaper in the unfolded state. is shown.

The pants-type disposable diaper of the present embodiment includes a waist region T defined as a front-back direction range having side seal portions 12A (a front-back direction range from the waist opening WO to the upper ends of the leg openings LO) and a portion forming the leg openings LO. It has an intermediate region L defined as a front-back direction range (between a front-back direction region having the side seal portions 12A of the front body F and a front-back direction region having the side seal portions 12A of the back body B). The waist region T can be divided into a “waist portion” W conceptually forming the edge of the waist opening and a “lower waist portion” U below this. Usually, when there is a boundary where the width direction elastic stress changes in the waist region T (for example, the thickness or elongation rate of the elastic elastic member changes), the waist opening WO side is the waist part from the boundary closest to the waist opening WO side. W, and if there is no such boundary, the waist portion W is closer to the waist opening WO than the absorber 56 or the inner body 200 . The lengths in the front-rear direction differ depending on the size of the product and can be determined as appropriate. For example, the waist portion W can be 15 to 40 mm, and the lower waist portion U can be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are constricted in a U-shape or curvilinear shape along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is inserted. As a result, the unfolded pants-type disposable diaper has a substantially hourglass shape as a whole.

(inner body)
The inner body 200 can take any shape, but in the illustrated form it is rectangular. As shown in FIGS. 3 to 5, the inner body 200 includes a top sheet 30 arranged on the body side, a liquid-impermeable sheet 11 arranged on the back side of the top sheet 30, and a liquid-impermeable sheet 11 arranged therebetween. It has an intervening absorbent element 50 and is the main body part responsible for the absorbent function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid permeating the top sheet 30 to the absorbent element 50, and reference numeral 60 denotes an intermediate sheet. 2 shows riser gathers 60 standing on the body side provided on both sides of the inner body 200 in order to prevent excrement from leaking to both sides of the inner body 200. FIG.

(top sheet)
The top sheet 30 is liquid-permeable, and examples thereof include perforated or non-perforated nonwoven fabrics and porous plastic sheets. In addition, among these, the nonwoven fabric is not particularly limited as to what the raw material fibers are. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, and polyamides, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of these. etc. can be exemplified. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of processing methods include known methods such as spunlace, spunbond, thermal bond, meltblown, needle punch, air through, and point bond methods. For example, if flexibility and drapeability are desired, the spunbond method and spunlace method are preferable, and if bulkiness and softness are desired, the air through method, point bond method, and thermal bond method are preferable processing methods. .

Further, the top sheet 30 may be composed of one sheet, or may be composed of a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may consist of one sheet or two or more sheets in the planar direction.

Both sides of the top sheet 30 may be folded back at the side edges of the absorbent element 50 , or may protrude laterally from the side edges of the absorbent element 50 without being folded.

The top sheet 30 is desirably fixed to a member adjacent to the back side by means of material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive.

(intermediate sheet)
An intermediate sheet (also called a “second sheet”) 40 having a faster liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated the top sheet 30 to the absorbent body 56 . The intermediate sheet 40 is intended to quickly transfer the liquid to the absorbent body 56 to enhance the absorption performance of the absorbent body 56 and prevent the "return" phenomenon of the absorbed liquid from the absorbent body 56 . The intermediate sheet 40 can also be omitted.

Examples of the intermediate sheet 40 include materials similar to those of the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, pointbond nonwoven fabric, and crepe paper. In particular, an air-through nonwoven fabric is preferred because it is bulky. Composite fibers having a core-sheath structure are preferably used for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. The basis weight is preferably 17-80 g/m ² , more preferably 25-60 g/m ² . The thickness of the raw fibers of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the non-woven fabric bulky, it is also preferable to use eccentric fibers, hollow fibers, or eccentric and hollow fibers whose core is not in the center as mixed fibers of all or part of the raw material fibers.

The intermediate sheet 40 in the illustrated example is shorter than the width of the absorbent body 56 and arranged in the center, but it may be provided over the entire width of the absorbent body 56 . The length of the intermediate sheet 40 in the front-rear direction may be the same as the full length of the diaper, the length of the absorbent element 50, or within a short length range centered on the liquid-receiving area.

The intermediate sheet 40 is desirably fixed to a member adjacent to the front side or the back side by means of material welding such as heat sealing or ultrasonic sealing, or by hot melt adhesive.

(liquid-impermeable sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited, but examples thereof include plastic films made of olefin resins such as polyethylene and polypropylene, laminated nonwoven fabrics in which a plastic film is provided on the surface of nonwoven fabrics, and plastic films. A laminated sheet in which a nonwoven fabric or the like is layered and joined to the sheet can be exemplified. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impermeable and moisture-permeable material that is preferably used 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 the sheet in a uniaxial or biaxial direction. is widely used. Other methods include non-woven fabrics using microdenier fibers, leak-proof enhancement by reducing fiber voids by applying heat and pressure, and coating with superabsorbent or hydrophobic resins or water repellents. Therefore, a liquid-impermeable sheet without using a plastic film can be used as the liquid-impermeable sheet 11, but it is preferable to use a resin film.

The liquid-impermeable sheet 11 has a width that can be accommodated on the back side of the absorbent element 50 as shown in the figure. It can also extend to both sides. It is appropriate that the width of this extended portion is about 5 to 20 mm on each side.

(Getting up gathers)
The rising gathers 60 are for preventing side leakage, extend along both sides of the inner body 200 over the entire front-rear direction LD, and stand up from the sides of the inner body 200 to the front side.

The rising gathers 60 shown in FIGS. 1, 3 and 4 have a root side portion 60B that rises obliquely toward the center in the width direction, and a tip side portion 60A that rises obliquely outward in the width direction from the intermediate portion. However, the present invention is not limited to this, and appropriate modifications such as a configuration in which the entire body stands on the center side in the width direction are possible.

More specifically, the illustrated rising gathers 60 are formed by folding a band-shaped gathered nonwoven fabric 62 having a length equal to the length of the inner body 200 in the front-rear direction in the width direction WD at the leading end to fold it in two. While overlapping, a plurality of elongated gather elastic members 63 are fixed in a stretched state along the longitudinal direction at intervals in the width direction WD between the folded portions and the sheets in the vicinity thereof. A base end portion of the rising gathers 60 located on the opposite side to the tip portion (the end portion on the side opposite to the sheet folded portion in the width direction WD) is fixed to the side portion of the inner body 200 on the back side of the liquid-impermeable sheet 11. The base portion 65 is formed as a flattened base portion 65, and the portion other than the base portion 65 is a body portion 66 extending from the base portion 65 (portion on the folded portion side). Further, the body portion 66 has a root side portion 60B extending toward the center in the width direction, and a distal end portion 60A that is folded back at the tip of the root side portion 60B and extends outward in the width direction. This form is a surface-contact type rising gather 60, but a line-contact type rising gather 60 that is not folded outward in the width direction can also be employed. Both ends of the main body portion 66 in the front-rear direction are laid down portions 67 fixed to the side surfaces of the top sheet 30 in the laid-down state, while an intermediate portion in the front-rear direction positioned therebetween is not fixed. A gathered elastic member 63 extending in the front-rear direction LD is fixed to at least the tip of the free portion 68 in a stretched state.

In the riser gathers 60 configured as described above, the contractile force of the gather elastic members 63 acts to bring the front and rear ends closer together, but the front and rear ends of the body portion 66 are fixed so as not to stand up. On the other hand, since there is a non-fixed free portion 68 between them, only the free portion 68 stands up so as to abut on the body side as indicated by the arrow in FIG. In particular, when the base portion 65 is located on the back side of the inner body 200, the free portion 68 in and near the crotch portion stands up so as to open outward in the width direction, so that the rising gathers 60 come into contact with the leg circumference. and the fit improves.

Like the rising gathers 60 in the illustrated example, the main body portion 66 is bent to include a root side portion 60B extending toward the center in the width direction and a distal end portion 60A extending outward in the width direction by folding back at the tip of the root side portion 60B. In the form, the tip side portion 60A and the root side portion 60B are joined in the lying down state at the lying portion 67, and the root side portion 60B is joined to the top sheet 30 in the lying down state. At least one of hot-melt adhesives by various application methods and material welding means such as heat sealing and ultrasonic sealing can be used to join the facing surfaces in the lodging portion 67 .

As the gathered nonwoven fabric 62, nonwoven fabric such as spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), meltblown nonwoven fabric, etc., which is soft and excellent in uniformity and concealability, is water-repellent with silicone or the like as necessary. A treated material can be preferably used, and the fiber basis weight is preferably about 10 to 30 g/m ² . A thread rubber or the like can be used as the gather elastic member 63 . When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate when fixed is preferably 150 to 350%, more preferably 200 to 300%. The term "elongation rate" means a value when the natural length is taken as 100%. As shown in the figure, a waterproof film 64 can be interposed between the gathered nonwoven fabrics 62 folded in two. In this case, the gathered nonwoven fabrics 62 can be partially omitted where the waterproof film 64 exists. However, in order to make the appearance and feel of the product like cloth, it is necessary that at least the outer surface of the riser gathers 60 from the base end to the tip be formed of the gathered nonwoven fabric 62, as shown in the illustrated example. be.

The number of gather elastic members 63 is preferably 2-6, more preferably 3-5. An appropriate arrangement interval is 3 to 10 mm. With this configuration, the area in which the gather elastic member 63 is arranged can easily come into contact with the skin. The gather elastic member 63 may be arranged not only on the tip side but also on the root side.

The dimensions of the rising gathers 60 in the illustrated example can be determined as appropriate. ) W2 is preferably 15 to 60 mm, especially 20 to 40 mm. In addition, the separation distance W1 between the innermost creases in the state where the rising gathers 60 are folded flat so as to be parallel to the surface of the top sheet 30 is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

(absorbing element)
The absorbent element 50 has an absorbent body 56 and a wrapping sheet 58 that wraps the entire absorbent body 56 . The packaging sheet 58 can also be omitted.

(Absorber)
Absorbent body 56 can be formed from an aggregate of fibers. The filament assembly may be a filament assembly obtained by laminating short fibers such as cotton pulp or synthetic fibers, or by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate as necessary. can also be used. The fiber basis weight can be, for example, about 100 to 300 g/m ² when piling up cotton pulp or short fibers, and for example, about 30 to 120 g/m ² for filament aggregates. can be done. The fineness of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, more preferably 1 to 5 dtex. In the case of a filament assembly, the filaments may be non-crimped fibers, but crimped fibers are preferred. The degree of crimping of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, more preferably 15 to 50 per 2.54 cm. Further, uniformly crimped crimped fibers can be used. It is preferable to disperse and hold superabsorbent polymer particles in the absorbent body 56 .

The absorbent body 56 may be rectangular, but as shown in FIGS. 1 and 2, it has a front end, a rear end, and a constricted portion positioned between them and narrower than the front and rear ends. It is preferable that the absorbent core 56 itself and the riser gathers 60 fit around the legs better.

The size of the absorbent body 56 can be determined as appropriate as long as it spans the front, rear, left, and right of the urination opening position, but it preferably extends to the peripheral edge of the inner body or its vicinity in the front, rear, and width directions. The reference numeral 56X indicates the width of the absorber 56. As shown in FIG.

(superabsorbent polymer particles)
Absorbent body 56 may contain superabsorbent polymer particles in part or in its entirety. Superabsorbent polymer particles include "powder" in addition to "particles". As the superabsorbent polymer particles 54, those used in this type of disposable diaper can be used as they are. The ratio of particles remaining on the top is preferably 30% by weight or less, and the ratio of particles remaining on the sieve after sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006) A content of 60% by weight or more is desirable.

Materials for the superabsorbent polymer particles may be used without any particular limitation, but those having a water absorption of 40 g/g or more are suitable. Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles. and acrylic acid (salt) polymers can be used. As for the shape of the superabsorbent polymer particles, the powder particles that are commonly used are suitable, but other shapes can also be used.

As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too slow, the liquid supplied into the absorbent body 56 tends to return to the outside of the absorbent body 56, which is called reversion.

As the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the absorbent body 56 is bulky, it is possible to effectively suppress the feeling of stickiness after liquid absorption.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorbent body 56 . Therefore, although it cannot be generalized, it can be 50 to 350 g/m ² . If the weight per unit area of the polymer is less than 50 g/m ² , it becomes difficult to secure the absorption amount. Above 350 g/m ² , the effect saturates.

If necessary, the superabsorbent polymer particles can be adjusted in the planar direction of the absorbent body 56 in the distribution density or distribution amount. For example, the liquid excretion site can be sprayed with a larger amount than other sites. In consideration of gender differences, it is possible to increase the spraying density (amount) in the front for men and to increase the spraying density (amount) in the center for women. Moreover, it is also possible to provide a portion where the polymer does not exist locally (for example, spot-like) in the planar direction of the absorbent body 56 .

(packaging sheet)
When the packaging sheet 58 is used, tissue paper, especially crepe paper, non-woven fabric, poly-laminated non-woven fabric, a perforated sheet, or the like can be used as the material. However, it is desirable that the sheet is such that the superabsorbent polymer particles do not escape. When non-woven fabric is used instead of crepe paper, hydrophilic SMS non-woven fabric (SMS, SSMMS, etc.) is particularly suitable, and its material can 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 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and back edges, etc. It is preferable that the absorbent body 56 is wound in a shape, the front and rear edges thereof protrude from the front and rear of the absorbent body 56, and the overlapping portions of the wound portion and the front and rear protruding portions are joined by joining means such as hot-melt adhesive or material welding.

(Exterior body)
The exterior bodies 12F and 12B are composed of a front exterior body 12F that constitutes the front body F and a rear exterior body 12B that constitutes the back body B. The front exterior body 12F and the rear exterior body 12B are discontinuous on the crotch side and spaced apart in the front-to-rear direction. This separation distance 12d can be about 150 to 250 mm. A portion of the exposed portion of the rear surface of the interior body 200 in the spaced portion (for example, the portion exposed between the front exterior body 12F and the rear exterior body 12B extends over the entire front-rear direction, but does not extend to the front and rear ends of the interior body 200). Also, it is desirable to attach the crotch cover sheet 12M made of non-woven fabric or the like so as to cover the width direction both side edges of the inner body 200) or to cover the whole, but it is possible to omit it. Moreover, as shown in FIGS. 7 and 8, the outer body 12 may be formed integrally from the front body F to the back body B through the crotch. That is, the outer bodies 12F and 12B, which individually configure the front body F and the back body B, correspond to the former form, and the outer body 12, which integrally configures the front body F and the back body B, corresponds to the latter form. .

The outer bodies 12F and 12B have a waist portion corresponding to the waist region T in the front-rear direction. In this embodiment, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a buttock cover portion 14 extending from the waist region T toward the intermediate region L side. are doing. Although not shown, the front exterior body 12F may also be provided with an inguinal cover portion extending from the waist region T toward the intermediate region L side, or may be provided with an inguinal cover portion but not with a buttock cover portion. It is not necessary to provide a portion corresponding to the intermediate region L on both sides of the rear exterior body 12B. Further, in the illustrated embodiment, the lower edge of the buttock cover portion 14 is formed in a straight line along the width direction, like the lower edge of the front exterior body 12F, but is located on the side of the waist opening toward the outer side in the width direction. It can also be a curve that becomes

The exterior bodies 12F and 12B are formed by joining the outer sheet layer 12S and the inner sheet layer 12H by joining means such as hot-melt adhesive or welding. The sheet material forming the outer sheet layer 12S and the sheet material forming the inner sheet layer 12H may be a single common sheet material as in the embodiment shown in FIG. It can also be a sheet material. That is, in the former case, the inner sheet layer 12H and the outer sheet layer 12S are respectively formed by the inner portion and the outer portion of the single sheet material folded back at the edge of the waist opening WO (which may be the edge on the crotch side). be done. The former mode has the advantage that the inner sheet layer 12H and the outer sheet layer 12S are less likely to be misaligned when they are bonded together, and the latter mode has the advantage that the number of sheet materials is small.

The sheet materials used for the outer sheet layer 12S and the inner sheet layer 12H are not particularly limited, but nonwoven fabrics are preferable. A nonwoven fabric made of mixed fibers, composite fibers, etc., in which more than one kind is used, can be used. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of processing methods include known methods such as spunlace, spunbond, thermal bond, meltblown, needle punch, air through, and point bond methods. When a non-woven fabric is used, it is preferable that its basis weight is about 10 to 30 g/m ² .

Further, it is preferable that the total basis weight of the exterior bodies 12F and 12B is about 20 to 60 g/m ² .

(stretchable area/non-stretchable area)
In addition, in order to improve the fit around the wearer's waist, the outer bodies 12F and 12B are provided with elongated elastic elastic members 15 to 19 such as rubber threads between the outer sheet layer 12S and the inner sheet layer 12H. An expansion/contraction region is formed that elastically expands and contracts in the width direction as the elastic expansion/contraction member expands and contracts. In this stretchable region, the outer sheet layer 12S and the inner sheet layer 12H shrink with the contraction of the elastic stretchable member in the natural length state, forming wrinkles or folds. The outer sheet layer 12S and the inner sheet layer 12H can be stretched up to a predetermined elongation rate at which they are completely stretched without wrinkles. Synthetic rubber or natural rubber may be used for the elongated elastic members 15-19. For bonding the outer sheet layer 12S and the inner sheet layer 12H in the exterior bodies 12F and 12B, and fixing the elongated elastic members 15 to 19 sandwiched therebetween, hot-melt adhesives and heat sealing by various coating methods are used. At least one of fixing means by material welding such as ultrasonic sealing can be used. Firmly fixing the entire surfaces of the exterior bodies 12F and 12B will impair the flexibility, so it is preferable to either not adhere or weakly adhere the elongated elastic members 15 to 19 other than the adhered portions. In the illustrated embodiment, the hot-melt adhesive is applied only to the outer peripheral surfaces of the elongated elastic stretchable members 15 to 19 by means of an application means such as a comb gun or Surewrap nozzle, and sandwiched between the sheet layers 12S and 12H to obtain the elongated shape. Fixing the elongated elastic members 15 to 19 to both the sheet layers 12S and 12H and fixing between the sheet layers 12S and 12H can be performed only by the hot melt adhesive applied to the outer peripheral surfaces of the elastic members 15 to 19. It has a structure to carry out. The elastic stretchable members 15 to 19 can be fixed to the outer sheet layer 12S and the inner sheet layer 12H only at both ends of the stretchable region in the stretching direction.

More specifically, between the outer sheet layer 12S and the inner sheet layer 12H in the waist portion W of the exterior bodies 12F and 12B, a plurality of waist portion elastic stretchable members 17 are vertically spaced so as to be continuous over the entire width direction. are installed with a gap between them. In addition, one or more of the waist elastic stretchable members 17 disposed in the region adjacent to the lower waist portion U may overlap the inner body 200 or overlap the inner body 200 in the width direction. They may be provided on both sides in the width direction, except for the central portion. The waist elastic member 17 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1 mm 2 . .0 ^mm2 ) are preferably provided at intervals of 4 to 12 mm, and the elongation rate of the waist portion W in the width direction is 150 to 400%, particularly about 220 to 320%. It is preferable to have In addition, the waist portion W does not need to use the waist portion elastic members 17 of the same thickness in the front and rear direction or to have the same elongation rate. The thickness and elongation rate may be different.

Between the outer sheet layer 12S and the inner sheet layer 12H in the lower waist portion U of the outer bodies 12F and 12B, a plurality of lower waist elastic members 15 and 19 made of elongated elastic members are vertically spaced apart. are installed with a gap between them.

The lower waist elastic members 15 and 19 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , especially 0.1 It is preferable to provide about 5 to 30 thread rubbers with an interval of 1 to 15 mm, particularly 3 to 8 mm ^. , particularly preferably about 240 to 300%.

Between the outer sheet layer 12S and the inner sheet layer 12H of the buttock cover portion 14 of the rear exterior body 12B, a plurality of cover portion elastic stretchable members 16 each made of an elongated elastic stretchable member are vertically spaced apart. installed.

The thickness of the cover portion elastic expansion/contraction member 16 is 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1.5 mm 2 . It is preferable to provide about ² to 10 rubber threads of 5 to 40 mm, particularly 5 to 20 mm, at intervals of 5 to 40 mm, particularly 5 to 20 mm. % is preferred.

In the case of providing an inguinal cover portion on the front side exterior body 12F, similarly, an elastic expansion/contraction member for the cover portion can be provided.

When the elastic stretchable members 15, 16, 19 are provided in the front-back direction range having the absorber 56, as in the illustrated embodiment of the lower waist portion U and the buttocks cover portion 14, the width of the absorber 56 is reduced in part or all. In order to prevent shrinkage in the direction, part or all of the portion overlapping the absorbent body 56 in the width direction is made the non-stretchable region 26 (26A). On the other hand, at least a portion of the portion that does not overlap the absorbent body 56 in the width direction is provided with a contraction region 27 .

In the embodiment of FIG. 2, a non-stretchable region 26 (26B) is provided on the side of the absorbent body 56 in the width direction of the rear exterior body 12B in the portion B1 of the rear exterior body 12B that does not overlap with the absorbent body 56. , and stretchable regions 28 are provided on both sides in the width direction of the rear exterior body 12B (on the side of the side seal 12A). By providing the non-stretchable region 26 (26B) in the portion B1 of the rear exterior body 12B that does not overlap with the absorbent body 56, the widthwise edge of the absorbent body 56 separates from the rear exterior body 12B and becomes easier to rise. , the fit of the absorbent body 56 to the wearer is improved. In addition, since the non-stretchable region 26 (26B) does not shrink, compared to the case where the non-stretchable region 26 (26B) is not provided, the widthwise end portions of the absorbent body 56 can be prevented from shrinking inward in the width direction. . As a result, when the diaper is worn, the area of the absorbent body 56 covering the skin surface of the wearer's buttocks can be increased, and the fit can be improved.

The length in the width direction of the non-stretchable region 26 (26B) provided in the portion B1 of the rear exterior body 12B that does not overlap with the absorber 56 becomes longer at the lower end portion 45 of the waist region T of the rear exterior body 12B. , and gradually becomes shorter from the lower end portion 45 toward the waist side of the rear exterior body 12B. Further, the length is gradually shortened from the lower end portion 45 toward the crotch side of the rear exterior body 12B.

The top of the wearer's buttocks often overlaps the lower end 45 of the waist region T of the back exterior body 12B. Since the top portion of the wearer's buttocks is the portion where the perimeter of the buttocks is the longest, it is preferable to maintain the width of the absorbent body 56 at this portion to be the widest. Therefore, in the present embodiment, the length in the width direction of the non-stretchable region 26 (26B) is increased at the lower end portion 45 of the waist region T of the rear exterior body 12B, and the width direction of the absorber 56 on the lower end portion 45 is increased. It is configured to prevent inward contraction.

On the other hand, toward the waist portion W of the absorber 56, the farther from the urination opening, the more difficult it is for the urine to reach. In addition, if the shrinkage of the waist portion W is gradual, the upper end portion of the disposable diaper tends to roll up and slip off. Therefore, the length of the width of the non-stretchable region 26 (26B) is gradually shortened from the lower end 45 toward the waist.

In addition, since the crotch part side of the absorbent body 56 is sandwiched between the legs of the wearer and contracts, it is necessary to intentionally provide the non-stretchable region 26 (26B) in the part of the rear exterior body 12B that does not overlap with the absorbent body 56. less sexual. Also, the circumference of the buttocks is shorter than that of the top of the buttocks. Therefore, the length of the width of the non-stretchable region 26 (26B) is made shorter from the lower end portion 45 of the waist region T toward the crotch portion.

In addition, when the width of the non-stretchable region 26 (26B) is gradually changed as in the present invention, there is an advantage that manufacturing is easier than when the width is changed abruptly.

In the lower end portion 45 of the waist region T of the rear exterior body 12B, the total length in the width direction of the non-stretchable region 26 (26B) in the portion B1 of the rear exterior body 12B that does not have the absorber 56 is equal to The length is 30% to 50% of the total length in the width direction of the portion B1 that does not have the absorbent body 56 . In addition, since the rear exterior body 12B has the non-stretchable regions 26 (26B) on the left and right sides of the absorbent body 56, respectively, the total length of the non-stretchable regions 26 (26B) in the width direction is the non-stretchable region 26 ( 26B) is the length obtained by doubling the length A1B in the width direction. In addition, since the rear exterior body 12B has portions B1 that do not have the absorbent body 56 on the left and right sides of the absorbent body 56, respectively, the total length in the width direction of the portion B1 that does not have the absorbent body 56 is equal to the length of the absorbent body It is the length obtained by doubling the length in the width direction of the portion B1 that does not have 56 . Specifically, the total length in the width direction of the portion B1 of the rear exterior body 12B that does not have the absorbent body 56 is set to 200 mm to 280 mm, and the non-stretchable region 26 ( 26B) is preferably 60 mm to 140 mm in width.

If the total length in the width direction of the non-stretchable region 26 (26B) is shorter than 30%, the effect of improving the fit of the absorbent body 56 is reduced. On the other hand, if the total length in the width direction of the non-stretchable region 26 (26B) is longer than 50%, the disposable diaper tends to slide down. Therefore, the total length in the width direction of the non-stretchable region 26 (26B) is preferably about 30% to 50% of the total length in the width direction of the area B of the rear exterior body 12B that does not have the absorber 56. .

In addition, in the embodiment of FIG. 2, the length in the width direction of the non-stretchable region 26 provided in the front exterior body 12F is longer at the waist side end of the absorber 56 and extends from the waist side end toward the crotch side. gradually getting shorter. As described above, since the non-stretchable region 26 (26B) is provided in the portion B1 of the rear exterior body 12B that does not overlap with the absorber 56, the tightening force of the lower end portion 45 of the waist region T of the rear exterior body 12B is relatively low. will decrease to In order to prevent this decrease, the tightening force of the lower end portion 45 of the waist region T of the front exterior body 12F is improved.

Further, as described above, the length in the width direction of the non-stretchable region 26 (26B) provided in the portion B1 of the rear exterior body 12B that does not overlap with the absorber 56 becomes shorter toward the waist side end. Therefore, compared to the lower end portion 45 of the waist region T, the tightening force at the waist side end portion becomes higher, and the balance of the tightening force is deteriorated in the disposable diaper as a whole. Therefore, the tightening force of the lower end portion 45 of the waist region T of the front outer body 12F is reduced to make the tightening force balance of the diaper as a whole as uniform as possible.

Only the structure of the rear exterior body 12B may be used without using the structure of the front exterior body 12F described above. In this case, in the front exterior body 12F, the non-stretchable region 26 (26A) may be provided only in the portion overlapping the absorber 56, or the non-stretchable region 26 may not be provided at all.

Further, in the above description, a structure in which the rear exterior body 12B and the front exterior body 12F are reversed may be employed.

Although it is preferable that the waist portion W is the stretchable region A2 over the entire width direction, a non-stretchable region may be provided in the middle of the widthwise direction similarly to the lower waist portion U.

The non-stretchable regions 26 (26A, 26B) can be formed by cutting the elongated elastic stretchable members 15, 16, 17, 19. As shown in FIG. The cut elongated elastic members 15 , 16 , 17 , 19 contract and unnecessary elastic members 18 are formed at the ends of the elongated elastic members 15 , 16 , 17 , 19 . That is, the non-stretchable regions 26 (26A, 26B) remained between the inner sheet layer 12H and the outer sheet layer 12S, which are continuous from the stretchable region 28, and the inner sheet layer 12H and the outer sheet layer 12S. It can be said that this area has the unnecessary elastic stretchable member 18 and does not elastically stretch in the width direction of the absorbent article.

(through hole)
In the embodiment of FIG. 2, a plurality of through holes 46 are provided in the non-stretchable region 26 (26B) provided in the portion B1 of the rear exterior body 12B that does not overlap with the absorber 56. As shown in FIG. By providing the through holes 46 in the non-stretchable region 26 (26B), breathability can be improved. In particular, after urinating, the absorbent body 56 and the vicinity of the absorbent body 56 tend to get stuffy. Therefore, by providing the through-holes 46 in the non-stretchable region 26B located near the absorber 56, it is possible to improve air permeability and suppress stuffiness. The through-holes 46 may be provided in the non-stretchable region 26 (26B) provided in the portion B1 of the front exterior body 12F that does not overlap the absorber 56. As shown in FIG.

The through hole 46 is a hole penetrating through at least one of the inner sheet layer 12H and the outer sheet layer 12S. From the viewpoint of improving breathability, it is preferable that the holes pass through both the inner sheet layer 12H and the outer sheet layer 12S. Further, when the through holes 46 are provided in either the inner sheet layer 12H or the outer sheet layer 12S, they are preferably provided in the inner sheet layer 12H. This is because providing the through-holes 46 in the inner sheet layer 12H reduces the contact area between the wearer's skin surface and the inner sheet layer 12H, thereby making it easier to perceive improved breathability.

In at least one of the rear exterior body 12B and the front exterior body 12F, a plurality of through-holes 46 may be provided over the entire surface of the non-stretchable region 26 (26B), or may be provided in a part of the non-stretchable region 26 (26B). One or more locations may be provided. Moreover, in at least one of the rear exterior body 12B and the front exterior body 12F, the through holes 46 may be provided in the entirety or part of the portion overlapping the absorbent body 56 .

As a method for providing the non-stretchable regions 26, a method of pressing a cutter or the like against the elongated elastic elastic members 15, 16, 17, 19 to cut the elongated elastic elastic members 15, 16, 17, 19 is exemplified. can do. At this time, it is preferable to cut the elongated elastic members 15, 16, 17, 19 with a cutter or the like and at the same time provide through holes 46 in at least one of the inner sheet layer 12H and the outer sheet layer 12S. This is because the manufacturing process can be simplified and the manufacturing time can be shortened. In this case, the through-holes 46 correspond to traces (cut traces) obtained by cutting the elongated elastic members 15, 16, 17, and 19.

(design sheet)
At least one of the front exterior body 12F and the rear exterior body 12B is provided with a design sheet 25 having a design such as a character. The design sheet 25 is provided with a pattern that can be visually recognized from the outside for the purpose of improving the appearance. It is possible to promote communication and intellectual training between parents and children when changing diapers. In the present invention, it is preferable that the area in which the design sheet 25 is provided overlaps the area in which the through holes 46 are provided.

In at least one of the front exterior body 12F and the rear exterior body 12B, if the through holes 46 are provided in a portion that does not overlap the absorber 56, the wearer's skin is directly exposed to the outside air. There is a problem that it is likely to be affected by the outside air, such as feeling cold in winter, and there is a high possibility of feeling uncomfortable. Moreover, since the wearer's skin is visible from the outside, there is a problem that the appearance is not good. Furthermore, since the strength of the exterior body is lowered, there is also a problem that it is easily torn when worn.

Therefore, by providing the design sheet 25 so as to cover the portion where the through hole 46 is provided, it is possible to reduce the discomfort due to the influence of the outside air, improve the appearance, and improve the strength of the exterior body.

In the embodiment of FIG. 4, the design sheet 25 is provided between the inner sheet layer 12H and the outer sheet layer 12S. can be

(Production method)
As a method for manufacturing the non-stretchable region 26 and the through-holes 46 of the absorbent article according to the present invention, the following method can be exemplified.

For example, after applying an adhesive (such as a hot-melt adhesive) continuously or intermittently on either one of the inner sheet layer 12H and the outer sheet layer 12S, the elastic members 15, 16, 17, 19 is placed and sandwiched between the other sheet layer of the inner sheet layer 12H and the outer sheet layer 12S. Then, a cutting member (such as a cutter) is pressed from the outside to cut the elastic members 15, 16, 17, 19 and at least one of the inner sheet layer 12H and the outer sheet layer 12S.

As another method, one of the inner sheet layer 12H and the outer sheet layer 12S is provided with through holes 46 in advance, and an adhesive (such as a hot-melt adhesive) is continuously or intermittently applied to the sheet layer. After that, the elastic members 15, 16, 17 and 19 are placed. Then, the inner sheet layer 12H and the outer sheet layer 12S are sandwiched between the other sheet layers (the through holes 46 may or may not be provided in advance). Thereafter, a cutting member (such as a cutter) is pressed from the outside to cut the elastic members 15, 16, 17, 19 and at least one of the inner sheet layer 12H and the outer sheet layer 12S.

<Others>
- Although the above example is an example of application to pants-type disposable diapers, it can be applied to absorbent articles in general, such as tape-type disposable diapers, pad-type disposable diapers, and sanitary napkins.

4, 5, and 8 show only the locations of the hot-melt adhesive H on the exterior bodies 12F and 12B, but the locations to which the hot-melt adhesive H is applied are not limited to these locations. For example, although not shown, it can be applied to various arbitrary locations such as between the inner body 200 and the outer bodies 12F and 12B, the inside of the absorbent element 50, and the riser gathers 60.

- Fig. 9 shows an example of a method for cutting the elastic members 15, 16, 17 and 19. (a) is an example of cutting the elastic stretchable members 15 and 16 at the center of the non-stretchable region 26 in the width direction using a cutting blade that is long in the front-rear direction, and (b) is the same cutting blade as (a). is used to cut the elastic members 15 and 16 on the left side of the non-stretchable region 26 in the width direction. In (a) and (b), the elastic stretchable members 15 and 16 are adhered to the interior sheet layer 12H (or the exterior sheet layer 12S) in the stretchable region 28, and adhered to the interior sheet layer 12H (or the exterior sheet layer 12S) in the non-stretchable region 26. Alternatively, it is not adhered to the exterior sheet layer 12S). Therefore, when the elastic stretchable members 15 and 16 are cut, the elastic stretchable members 15 and 16 are retracted to the outermost widthwise outside of the non-stretchable region 26 . Then, the stretchability of the non-stretchable region 26 is stretched only by the stretchability of the non-woven fabric itself of the interior sheet layer 12H (or the exterior sheet layer 12S), so that the fit on the buttocks can be improved.

FIG. 9(c) is an example in which the elastic members 15 and 16 are cut by pressing a myriad of point-like cutting blades against the entire non-stretchable region 26. As shown in FIG. In this case, the elastic stretchable members 15 and 16 are adhered to the interior sheet layer 12H (or the exterior sheet layer 12S) at both the stretchable regions 28 and the non-stretchable regions 26 . Therefore, a plurality of cut pieces 18 (unnecessary elastic members 18 ) of the elastic members 15 and 16 are present in the non-stretchable region 26 . As the cut piece 18 shrinks, the through hole 46 widens and becomes larger. Therefore, there is an advantage that air permeability is improved. Further, in the embodiment of FIG. 9(c), since the through-holes 46 are provided evenly over the entire surface of the non-stretchable region 26, there is an advantage that air permeability is better than that of FIGS. 9(a) and 9(b).

<Description of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

・"The lower end of the waist region" refers to a range having a certain distance in the front-rear direction. Specifically, the lower end aa' (a line segment continuous in the circumferential direction) of the waist region T is used as a reference line, and the line segment cc at a point moved from the reference line aa' to the waist side by 20 mm. ' and a line segment bb' at a point shifted 20 mm from the reference line aa' to the crotch side. In other words, the “lower end of the waist region” has a crotch side edge of the line segment bb′ and a waist side edge of the line segment cc′, and the line segments bb′ and c− It refers to a circumferentially continuous region sandwiched between c′. In FIGS. 2 and 7, the “lower end of the waistline region” refers to the gray region labeled 45 .
More specifically, in a form in which the exterior body of the front body and the exterior body of the back body are separate bodies, the length of the front body exterior body in the front-rear direction is the same as the length of the back body exterior body in the front-rear direction. , the lower end aa' of the waist region T refers to the crotch-side edge of the outer covering.
In addition, as illustrated in FIG. 2, in a form in which the front body and the back body are separated from each other, the length of the outer body of the front body in the front-rear direction and the length of the outer body of the back body in the front-rear direction , the lower end aa' of the waist region T refers to the crotch-side edge of the outer body having the shorter length in the front-rear direction. For example, in the form of FIG. 2, since the buttocks cover portion 14 is provided on the back body, the outer body of the back body is longer in the front-rear direction than the outer body of the front body. Therefore, when the outer body of the front body and the outer body of the back body are overlapped with the waist side edges aligned and fixed with the side seals, the part of the buttock cover part 14 does not overlap with the outer body of the front body. In addition, it becomes a form that protrudes to the crotch side. Therefore, in such a case, the crotch side edge of the outer body of the front body is the lower end aa' of the waist region T, and the lower end aa' of the waist region T of the back body is the outer body of the front body. It refers to the line segment at the point where it overlaps with the crotch side edge.
Further, as representatively illustrated in FIG. 7, in the form in which the front and rear exterior bodies are integrated, the lower end aa' of the waist area T corresponds to the start point 46 of the notch that constitutes the suspension. A continuous line segment in the circumferential direction.

- "Front-back (longitudinal) direction" means a direction connecting the ventral side (front side) and the dorsal side (rear side), and "width direction" means a direction (horizontal direction) perpendicular to the front-back direction.

- "Elongation rate" means a value when the natural length is taken as 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.

- "Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and deionized water: 97.09 wt%) 1.0 g of superabsorbent polymer is added to 49.0 g and stirred with a stirrer. The resulting gel is left in a thermo-hygrostat at 40° C. and 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I. techno Engineering).

- "Matsuke" is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (test location: temperature 23±1° C., relative humidity 50±2%) to a constant weight. Pre-drying refers to making a sample or test piece constant weight in an environment at a temperature of 100°C. Fibers with an official moisture content of 0.0% do not need to be pre-dried. Using a template for sampling (100 mm x 100 mm), a sample with dimensions of 100 mm x 100 mm is cut out per square meter from the constant weight test piece. The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as basis weight.

・The “thickness” is automatically measured using an automatic thickness gauge (KES-G5 handy compression measurement program) under the conditions of a load of 0.098 N/cm ² and a pressurized area of 2 cm ² .

・The amount of water absorption is measured according to JIS K7223-1996 "Testing method for water absorption of super absorbent polymer".

・The water absorption rate is the "time to the end point" when JIS K7224-1996 "Test method for water absorption rate of superabsorbent polymer" is performed using 2g of superabsorbent polymer and 50g of physiological saline. .

・If there is no description about environmental conditions for testing and measurement, the test and measurement shall be performed in a laboratory or equipment under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%). do.

・Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

INDUSTRIAL APPLICABILITY The present invention can be used for disposable absorbent articles such as the above examples.

A1... Width direction length of the non-stretchable region, A1A... Width direction length of the non-stretchable region 26A, A1B... Width direction length of the non-stretchable region 26B, A2... Width direction length of the stretchable region, L ... Intermediate area LO... Leg opening T... Waist area U... Lower waist part W... Waist part WO... Waist opening 11... Liquid impermeable sheet 12... Exterior body 12A... Side seal part , 12F front exterior body 12B rear exterior body 12H inner sheet layer 12S outer sheet layer 12r waist side folded portion 14 buttock cover portion 18 unnecessary elastic stretchable member 20 crotch side Folded portion 22 Cutting trace 25 Design sheet 25f Folded portion 26
Non-stretchable area 26A... Non-stretchable area of the portion of the outer packaging that overlaps the absorbent body 26B... Non-stretchable area of the portion of the outer packaging that does not overlap the absorbent body 27... Pattern printed portion 28... Stretchable area REFERENCE SIGNS LIST 30 Top sheet 40 Intermediate sheet 45 Lower end of waist region T 46 Through hole 50 Absorbing element 56 Absorbent body 58 Wrapping sheet 60 Raising gather 62 Gathering sheet 200 … Interior body, H … Hot-melt adhesive

Claims (1)

An outer body constituting a front body and an outer body constituting a back body are provided individually or integrally, and an inner body including an absorbent body is attached from the outer body constituting the front body to the outer body constituting the back body. be
When the outer body constituting the front body and the outer body constituting the back body are separately provided, the length of the outer body constituting the front body in the front-rear direction and the outer body constituting the back body have different lengths in the front-rear direction,
Both sides of the exterior body forming the front body and both sides of the exterior body forming the back body are respectively joined to form a waist opening and a pair of left and right leg openings,
At least one of the outer body constituting the front body and the outer body constituting the back body has a non-stretchable region provided in at least a part of the range having the absorber and a range not having the absorber. At least a portion of the elastic region has a stretchable region,
The elastic regions are an inner sheet layer, an outer sheet layer, and a plurality of elongated strips attached along the width direction at intervals in the front-rear direction between the inner sheet layer and the outer sheet layer. an elastic expansion/contraction member and a region that elastically expands and contracts in the width direction with expansion and contraction of the elastic expansion/contraction member,
The non-stretchable region has the inner sheet layer and the outer sheet layer continuous from the stretchable region, and an unnecessary elastic stretchable member remaining between the inner sheet layer and the outer sheet layer, and is elastic in the width direction. It is a non-stretchable area,
In the range without the absorber, the non-stretchable region is provided on the absorber side in the width direction of the outer package, and the stretchable region is provided on both side sides in the width direction of the outer package. ,
At least a part of the non-stretchable region in the range not having the absorber is provided with a through-hole penetrating through at least one of the inner sheet layer and the outer sheet layer,
In either one of the exterior body constituting the front body and the exterior body constituting the back body,
The length in the width direction of the non-stretchable region provided in the range not having the absorber of the exterior body is
the lower end of the waist region of the outer body is long, and the lower end of the outer body becomes shorter toward the waist side and the crotch side of the outer body ,
When the outer body constituting the front body and the outer body constituting the back body are separately provided, the lower end of the lower end portion of the waist region of the outer body is the one having the shorter length in the front-rear direction. a crotch-side edge of the exterior body,
When the outer body constituting the front body and the outer body constituting the back body are integrally provided, the lower end of the lower end of the waist region of the outer body is the start of the notch that constitutes the suspension. A point is a continuous line segment in the circumferential direction,
In the other exterior body that constitutes the front body and the exterior body that constitutes the back body,
The length in the width direction of the non-stretchable region provided in the range not having the absorber of the exterior body is
A disposable absorbent article, characterized in that the absorbent body has a long waist-side end and is gradually shortened from the waist-side end toward the crotch .

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