JP6315315B2 - Stretch structure of absorbent article, and absorbent article having the stretch structure - Google Patents

Description

  The present invention relates to a stretchable structure of an absorbent article and an absorbent article provided with the stretchable structure.

  For example, a pants-type disposable diaper includes an exterior body having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body, and the front body and the back body of the exterior body are on both sides. Are joined together to form a waist opening and a pair of left and right leg openings.

In pants-type disposable diaper, in order to improve the fitness to the body, in various places in the outer package, the elongated resilient and elastic members of rubber threads or the like along the circumferential direction and fixed under tension, girth up direction In particular, a waist edge elastic elastic member along the width direction at the edge of the waist opening, and a waist along the width direction at the crotch side than the waist edge elastic elastic member The thing provided with the lower elastic expansion-contraction member has comparatively high fit with respect to a body, and is used widely (for example, refer patent documents 1, 2).

On the other hand, the tape-type disposable diaper is a crotch part, an abdominal part extending to the front side of the crotch part, a back side part extending to the rear side of the crotch part, and an absorber provided in a region including the crotch part And a fastening tape that protrudes from both sides of the back portion and a target tape that is located on the outer surface of the abdominal portion and to which the fastening tape is connected. It has a structure which is connected to the target tape by turning from both sides to the outer surface of the abdominal side. Such a tape-type disposable diaper is used not only for infants but also widely used for nursing care (adult use). In general, the tape type disposable diaper, since the poor girth up direction of fit compared to the pants-type disposable diaper, in order to improve this, elongate thread rubber or the like along the width direction on the back side portion and the fastening tape the Jo of resilient and elastic members along the width direction is fixed in a stretched state, it has been made to form a telescopic structure of the body circumferential up direction.

  On the other hand, since the expansion / contraction direction of these expansion / contraction structures is limited only to the expansion / contraction direction of the elastic expansion / contraction member, it is also proposed that a part of the expansion / contraction structure is configured only by an omnidirectional expansion / contraction sheet such as an expansion / contraction nonwoven fabric (for example, see Patent Document 3) ).

  However, such a structure in which stretchable nonwoven fabric or the like is partially joined has problems such as complicated manufacturing when applied to a plurality of locations.

JP 2010-162277 A JP 2005-287663 A JP 2011-224100 A

  Therefore, a main problem of the present invention is to enable expansion and contraction in an arbitrary direction with a simple structure.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A first sheet material, a second sheet material facing one surface of the first sheet material, and a slit provided in the first sheet material along a direction intersecting the expansion / contraction direction or for forming the slit With perforations,
The portion corresponding to the slit or perforation in the second sheet material is at least a stretchable portion that can be stretched in a direction intersecting the slit,
The expansion / contraction part of the second sheet material is configured to expand and contract with the opening and closing of the slit of the first sheet material,
Between the first sheet material and the second sheet material, a plurality of elongated elastic stretch members are juxtaposed at intervals, and at least both ends of the elastic stretch members are the first sheet material and the second sheet material. It is fixed to two sheet materials,
The slit or perforation is formed between the elastic elastic members along the extending direction of the elastic elastic members.
An elastic structure of an absorbent article characterized by the above.

(Function and effect)
In the stretchable structure of the present invention, the first sheet material slit (formed in advance or formed by cutting the perforation) can be opened and closed, so that the stretchable direction of the stretchable portion of the second sheet material When a force is applied, the expansion / contraction portion of the second sheet material is not restricted by the first sheet material, and expands and contracts with the opening and closing of the slit of the first sheet material. At this time, since the slit of the first sheet material is covered by the second sheet material, no hole is formed even when opening and closing. Characteristically, since it can be expanded and contracted only by the double structure of the sheet and the slit, it is possible to expand and contract in any direction with an extremely simple structure in which the stretchable part and slit are provided in any position and in any direction. Even when a plurality of locations can be expanded and contracted, it is sufficient to increase the number of expansion / contraction portions and slits.

  Most of the one-way stretchable structures using the elongated elastic stretchable member have a structure in which the elastic stretchable member is sandwiched between two sheet materials. In contrast, the slit and the second sheet material stretchable according to the present invention. When the expansion / contraction function by a part is added, the expansion / contraction direction of arbitrary places can be made into two or more directions, without adding a sheet material. In this case, it is also possible to make the contraction force different between the expansion / contraction direction of the elastic expansion / contraction member and the expansion / contraction direction of the slit and the expansion / contraction portion of the second sheet material.

<Invention of Claim 2 >
A first sheet material, a second sheet material facing one surface of the first sheet material, and a slit provided in the first sheet material along a direction intersecting the expansion / contraction direction or for forming the slit With perforations,
The portion corresponding to the slit or perforation in the second sheet material is at least a stretchable portion that can be stretched in a direction intersecting the slit,
The expansion / contraction part of the second sheet material is configured to expand and contract with the opening and closing of the slit of the first sheet material,
The portion corresponding to the slit or perforation in the second sheet material is bent back multiple times to form an accordion shape, thereby forming the stretchable portion.
An elastic structure of an absorbent article characterized by the above .

(Function and effect)
By adopting such a structure, even if a material that does not expand and contract is used for the second sheet material, expansion and contraction is possible by opening and closing the folding of the bellows-shaped portion. Therefore, for example, when adding an expansion / contraction function by the slit of the present invention and the expansion / contraction part of the second sheet material to the conventional one-way expansion / contraction structure using the elongated elastic expansion / contraction member, the slit is used without changing the material. And formation of a bellows-like part (change of the joint structure of the first sheet material and the second sheet material to each other or other members so that the bellows-like part can be expanded and contracted and the slits can be opened and closed as necessary) ) Is enough.

<Invention of Claim 3 >
A first sheet material, a second sheet material facing one surface of the first sheet material, and a slit provided in the first sheet material along a direction intersecting the expansion / contraction direction or for forming the slit With perforations,
The portion corresponding to the slit or perforation in the second sheet material is at least a stretchable portion that can be stretched in a direction intersecting the slit,
The expansion / contraction part of the second sheet material is configured to expand and contract with the opening and closing of the slit of the first sheet material,
When the second sheet material is an elastic nonwoven fabric, a portion corresponding to the slit or perforation in the second sheet material is the elastic portion.
An elastic structure of an absorbent article characterized by the above .

(Function and effect)
Since the stretchable nonwoven fabric is a material that elastically stretches in all directions, if it is used as the second sheet material, stretchability in all directions can be added at the slit forming portion. Further, when an elastic nonwoven fabric is used as the second sheet material, slit formation (if necessary, the first sheet material and the second sheet material that can expand and contract the bellows-like portion and open and close the slit accordingly) Alternatively, the expansion / contraction function by the slit of the present invention and the expansion / contraction part of the second sheet material can be added only by changing the joining structure with respect to another member.

<Invention of Claim 4 >
An absorptive article provided with the elastic structure of an absorptive article given in any 1 paragraph of Claims 1-3 .

(Function and effect)
The same effects as the above-described claims can be obtained.

<Invention of Claim 5 >
An exterior body that constitutes the front body and the back body, and an interior body including an absorbent body provided inside the exterior body, both sides of the exterior body in the front body and both sides of the exterior body in the back body, Is a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed by forming a side seal part by being joined together,
The slit or perforation, and the elastic elastic member are arranged in the width direction on at least one of the waist opening side from the front-rear direction edge of the interior body in the exterior body and the side from the side edge of the interior body in the exterior body. The stretchable structure of the absorbent article according to claim 1 is provided so that
An absorbent article characterized by the above .

(Function and effect)
Pants in type disposable diaper, spaced in the longitudinal direction elongated resilient and elastic members along the width direction, but the form of tightening the Ri girth by its contraction force has become common, such conventional In general form, it is impossible to expand and contract in the front-rear direction (longitudinal direction), so that the abdomen and buttocks bulge, or the fit to the buttocks, iliac crest / upper anterior iliac spine, and leg circumference There is room for improvement. Therefore, as described above, the stretchable structure of the present invention is provided on the waist opening side of the interior body of the pants-type disposable diaper so that it can be stretched not only in the width direction but also in the front-rear direction (vertical direction). By improving the fit to the swelling of the abdomen and buttocks, or by providing the stretchable structure of the present invention to the side of the interior body side in the exterior body, the buttocks and iliac crest / upper anterior iliac spine, It is also proposed to improve the fit around the legs.

  As described above, according to the present invention, there are advantages such as being able to expand and contract in any direction with a simple structure.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. FIG. 6 is a sectional view taken along line 6-6 in FIG. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper. It is sectional drawing which shows the change of the principal part of a pants type disposable diaper. It is sectional drawing which shows the change of the principal part of a pants type disposable diaper. It is sectional drawing which shows the change of the principal part of a pants type disposable diaper. It is sectional drawing which shows the change of the principal part of a pants type disposable diaper.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 8 show an example 100 of a pants-type disposable diaper. The pants-type disposable diaper 100 includes an exterior body 12 that forms the outer surface (back surface) of the product, and an interior body 200 that is attached to the inner surface of the exterior body 12. Symbol Y indicates the total length of the diaper in the deployed state (the length in the vertical direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and symbol X indicates the diaper in the deployed state. The full width of is shown.

The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior body 12 is a part that supports the interior body 200 with respect to the wearer's body. The dotted pattern in the cross-sectional view shows the joint where each component is joined. The solid stretch of beads such as hot melt adhesive, beads, curtains, summits, spiral coating, etc. Instead of or together with this, it is formed by coating on the outer peripheral surface of an elastic stretchable member such as comb gun or sure wrap coating. In addition, “front-rear direction” means a direction connecting the ventral side (front side) and the back side (rear side), “width direction” means a direction (left-right direction) perpendicular to the front-rear direction, and “up-down direction mounting state of the diaper 100 and ", i.e. a direction which is perpendicular to the cylinder circumferential up direction when the diaper 100 to superimpose the front body side portions and the back body side portions folded into two at the crotch portion of the diaper 100, in other words This means the direction connecting the waist opening WO side and the crotch part side.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable back sheet 11, and an absorbent element 50 interposed therebetween. It is the main body that takes up the absorption 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 that has passed through the top sheet 30 to the absorbent element 50. Shows a three-dimensional gather 60 that stands on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, 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 bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

  When providing the three-dimensional gather 60, both sides of the surface sheet 30 pass between the liquid-impermeable back sheet 11 and the three-dimensional gather 60 to the back side of the absorbent element 50 to prevent penetration of the liquid. It is preferable to adhere to the liquid-impermeable back sheet 11 and the three-dimensional gather 60 with a hot melt adhesive or the like.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber 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. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber 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 an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

  The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

(Impermeable liquid back sheet)
The material of the liquid-impermeable back sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of the nonwoven fabric, or plastic Examples thereof include a laminated sheet in which a nonwoven fabric or the like is laminated on a film and joined. For the liquid-impermeable back sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a superabsorbent resin or hydrophobic resin or water repellent Accordingly, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable back sheet 11.

  The liquid-impermeable back sheet 11 is preferably extended to both sides of the side surface 30 of the absorbent element 50 by wrapping around both sides of the absorbent element 50 in order to improve leakage resistance. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable back sheet 11, especially the absorber 56 side surface.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. The three-dimensional gather 60 of this embodiment is provided so as to stand up from the side part of the interior body 200, the base side part stands up diagonally toward the center in the width direction, and the tip side part from the middle part is outside in the width direction. It stands up diagonally toward.

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. A base end portion (an end portion on the side opposite to the sheet folding portion in the width direction) located on the opposite side to the front end portion of the three-dimensional gather 60 is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200. A portion other than the attachment portion 65 is a protruding portion 66 (a portion on the folded portion side) protruding from the attachment portion 65. The projecting portion 66 includes a base side portion that extends toward the center in the width direction, and a tip side portion that is folded back outward in the width direction from the tip of the base side portion. This form is a surface contact type three-dimensional gather, but a line contact type three-dimensional gather (not shown) that is not folded outward in the width direction can also be employed. And while it is set as the front-and-rear fixing | fixed part 67 fixed to the side part surface of the surface sheet 30 by the hot-melt-adhesive agent or the heat seal in the front-back direction both ends among the protrusion parts 66, between these, The intermediate portion in the front-rear direction is a non-fixed free part, and an elongated elastic member 63 along the front-rear direction is fixed to the free part in an extended state.

Spunbonded nonwoven fabric (SS, SSS, etc.) as the gather sheet 62 and SMS nonwoven fabrics (SMS, SSMMS, etc.), an excellent non-woven fabric flexible and uniformity, concealment of such melt blown nonwoven fabric, such as by silicone over down as needed What gave the water-repellent process can be used suitably, and it is preferable that a fiber basis weight shall be about 10-30 g / m < ² >. As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%. Further, as shown in the drawing, a waterproof film 64 can be interposed between the gather sheets folded in two.

  2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable back sheet 11, and the absorbent element 50 in the interior body 200.

  In the three-dimensional gather 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought close to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.

  The dimensions of the three-dimensional gather 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. Further, in the state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the top sheet 30, the separation distance W3 between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  Note that, unlike the illustrated embodiment, the three-dimensional gathers can be provided in double (two rows) on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The degree of crimp of the crimped fibers can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per 2.54 cm . Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

The absorber 56 may have a rectangular shape, but as shown in FIG. 1, as shown in FIG. 1, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. If has a shape, the absorbent body 56 itself and the three-dimensional gathers 60, is improved, which is preferable fit of the leg circumferential Rie.

  Moreover, although the dimension of an absorber can be determined suitably, it is preferable to extend to the peripheral part of the interior body, or its vicinity in the front-back direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The proportion of particles remaining on the top is preferably 30% by weight or less, and the proportion of particles remaining on the screen by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006) 60% by weight or more is desirable.

  The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption (JIS K7223-1996 “Test method for water absorption of superabsorbent resin”) of 40 g / g or more are preferable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate (JIS K7224-1996 water absorption rate test method for superabsorbent resin) of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

  If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, 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 rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Exterior body)
The exterior body 12 has a part constituting a front body F extending from the crotch part to the abdomen and a part constituting a rear body B extending from the crotch part to the back side, and both sides of the front body F As shown in FIG. 8, a waist opening WO for passing the wearer's torso and a pair of left and right leg openings LO for passing the legs are formed. It is what. Reference numeral 12A denotes a joining portion (hereinafter, this portion is also referred to as a side seal portion). The crotch portion means the center in the front-rear direction from the waist edge of the front body F to the waist edge of the back body B in the unfolded state, and the front part and the back part thereof are the front body F and Each back body B is meant.

Exterior body 12, longitudinal extent having a side seal portion 12A and the body peripheral Ri portion T defined as (longitudinal extent extending to the upper end of the leg openings LO from the waist opening WO), the portion forming the leg openings LO It has an intermediate portion L defined by a front-rear direction range (between a longitudinal region having the side seal portion 12A of the front body F and a longitudinal region having the side seal portion 12A of the rear body B). Girth Ri unit T can conceptually be divided into a "waist edge" W to form the edge of the waist opening, "lower waist" and U is a lower part than this. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist edge W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put. As a result, the exterior body 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior body 12 can be determined as appropriate. In order to obtain a clean appearance as shown in FIGS. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

  As shown in FIG. 5, the exterior body 12 is formed by continuously or intermittently bonding two sheet materials 12 </ b> S and 12 </ b> H by an adhesive such as a hot melt adhesive or a welding means such as a heat seal or an ultrasonic seal. Can be formed. The intermittent bonding includes intermittent in one direction in the width direction or the front-rear direction, and continuous in the other direction, and intermittent (in the form of dots) in both directions. In the illustrated form, the inner sheet material 12H located on the inner side extends only to the edge of the waist opening WO, but the outer sheet material 12S wraps around the edge on the waist side of the inner sheet material 12H and is folded inside. The folded portion 12r extends so as to cover the upper end of the interior body 200.

The sheet materials 12S and 12H can be used without particular limitation as long as they are in sheet form, but are preferably non-woven fabrics. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >.

Then, the exterior body 12, in order to impart girth up direction of stretch, both sheet materials 12S, elongated resilient and elastic members 15 to 19 rubber threads are used between 12H along the girth up direction predetermined It is fixed at the elongation rate. The elongated elastic elastic members 15 to 19 may be fixed continuously in the longitudinal direction, intermittently, or fixed only at both ends as long as at least both ends are fixed to both sheet materials 12S and 12H. Is also possible. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For fixing the elongated elastic elastic members 15 to 19 sandwiched between the sheet materials 12S and 12H of the outer package 12, hot melt bonding, heat sealing, or ultrasonic bonding by various coating methods can be used.

More specifically, between the inner side surface of the inner sheet material 12H and the outer surface of the folded portion 12r of the outer sheet material 12S at the waist edge W of the rear body B and the front body F, the entire width direction is continuous. In addition, a plurality of waist edge elastic elastic members 17 are fixed in a state where they are extended along the width direction at a predetermined extension rate at intervals in the vertical direction. In addition, one or more of the waist edge elastic elastic members 17 disposed in a region adjacent to the waist lower portion U may overlap with the interior body 200 or may be overlapped with the interior body 200 in the width direction. You may each provide in the width direction both sides except a center part. The waist edge elastic elastic member 17 has a thickness of 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 the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. Further, the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .

  Further, between the outer side surface of the inner sheet material 12H and the inner side surface of the outer sheet material 12S in the lower waist portion U of the front body F and the rear body B, except for the central portion in the width direction overlapping the interior body 200, the upper side thereof. A plurality of waist lower elastic elastic members 15 and 19 made of an elongated elastic elastic member are continuously provided in the respective parts on both sides in the width direction so as to be continuous over the entire width direction. It is fixed in the state extended | stretched along the width direction.

The waist lower elastic 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 , particularly 0.1 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 1 to 15 mm, particularly 3 to 8 mm, and about 5 to 30 at an elongation of 200 to 350%, particularly about 240 to 300%.

  Further, the width between the outer side surface of the inner sheet material 12H and the inner side surface of the outer sheet material 12S in the intermediate portion L of the front body F and the rear body B, except for the widthwise central portion overlapping the interior body 200, is the width. A plurality of intermediate elastic elastic members 16 made of an elongated elastic elastic member, which are continuous in the entire width direction at each part on both sides in the direction, spaced in the vertical direction and at a predetermined elongation rate in the width direction It is fixed in a stretched state.

The intermediate elastic elastic members 16 and 18 have a thickness of 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 It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

  As shown in the figure, when the waist lower elastic elastic member and the intermediate elastic elastic members 15, 19, 16, 18 are respectively provided on both sides in the width direction except for the central portion in the width direction overlapping the interior body 200. The interior body 200 does not shrink more than necessary in the width direction, so that it does not look bad or absorbs. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. At the center in the width direction, the elastic expansion / contraction member is finely cut, and the contraction force does not act (substantially equivalent to not providing the elastic expansion / contraction member), and only the both sides in the width direction are configured as the contraction force acting portions. Are also included. Of course, the arrangement of the elastic lower elastic members 15, 19, 16, and 18 is not limited to the above example, and the lower waist so that the contraction force acts on the entire width of the lower waist U. A part or all of the elastic elastic member and the intermediate elastic elastic members 15, 19, 16, 18 can be provided across the interior body 200 from one side in the width direction to the other side.

(Post-processing tape)
A post-processing tape 70 (fixing means) can be provided at the center in the width direction on the outer surface of the rear body B of the outer package 12. The post-processing tape 70 is for fixing the diaper 100 in a state where the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside. As shown in FIG. 5, a general post-processing tape 70 has a base end portion 71 fixed to the outer surface of the exterior body 12 with an adhesive or the like, and a portion on the front end side with respect to the base end portion 71 is tri-folded. (Folded in a Z-shaped cross section) or folded in half, and the portion between the folded portions is fixed (temporarily fixed) by the temporary fixing adhesive 72 so as to be peelable. Moreover, while having the knob | pick part 73 colored in opaque colors, such as white, in the front-end | tip part, the part except this knob | pick part 73 is transparent or semi-transparent, Through the transparent or semi-transparent part in this post-processing tape 70, A design to be described later is visible from the outer surface side of the post-processing tape 70. Although a specific structure can be appropriately configured, in the illustrated embodiment, the whole is formed by connecting a plurality of transparent or semi-transparent substrates in the longitudinal direction, and a colored tape 74 is bonded to the knob 73. Is adopted.

  At the time of disposal, the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-processing tape 70 is peeled off and spread, and the diaper 100 is rolled or folded. The diaper 100 is fixed with an adhesive so as to be wound from the rear body B of the diaper 100 to the outer surface on the opposite side over the waist opening WO. The post-processing tape 70 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.

  Fixing means such as the post-processing tape 70 may be provided on the front body F or on both the back body B and the front body F.

(External body split structure)
In the above example, but before covering continuously the integral outer body 12 until the back body B from the body F, the outer body, and the ventral side outer covering the Rino Shu out ventral wearer It is divided into a back side exterior body that covers the back side, and the front end of the interior body is connected to the inner surface of the center part in the width direction of the abdominal side exterior body by a hot melt adhesive or the like, and the width direction of the back side exterior body The rear end portion of the interior body is connected to the inner surface of the central portion by a hot melt adhesive or the like, and the abdominal exterior body and the back exterior body are not continuous on the crotch side and are separated from each other. be able to. This separation distance can be about 150 to 250 mm. In this case, on the back surface of the liquid-impermeable back sheet in the interior body, so as to cover the entire back surface of the interior body, or so as to cover the entire portion exposed between the abdominal exterior body and the back exterior body, The crotch outer body can also be fixed. As the crotch outer casing, the same materials as those used for the outer casing described above can be used. The crotch outer body also corresponds to the outer body of the present invention.

(About features)
Characteristically, a slit 12x is formed along the width direction between the elastic elastic members 15 to 19 of the outer sheet material 12S in the exterior body 12, and a portion corresponding to the slit 12x in the inner sheet material 12H is The stretchable portion 12t can be stretched and contracted at least in the direction intersecting the slit 12x, and the stretchable portion 12t of the inner sheet material 12H is configured to expand and contract while opening and closing the slit 12x of the outer sheet material 12S. Accordingly, when a force is applied in the expansion / contraction direction of the expansion / contraction part 12t of the inner sheet material 12H, the expansion / contraction part 12t of the inner sheet material 12H is not regulated by the outer sheet material 12S, as shown in FIGS. The material 12S expands and contracts with the opening and closing of the slit 12x. At this time, since the slit 12x of the outer sheet material 12S is covered by the inner sheet material 12H, no hole is formed even when opening and closing. In order to facilitate understanding of the stretchable portion 12t, the stretchable portion 12t is indicated by a thick line in FIGS. 9 to 12, but this does not mean that the stretchable portion 12t is thicker than the surroundings.

  And in such a structure, since it can be expanded and contracted only by the double structure of the sheet materials 12S and 12H and the slit 12x, an extremely simple structure in which the expandable portion 12t and the slit 12x are provided in an arbitrary direction in an arbitrary direction. Thus, expansion and contraction in an arbitrary direction is possible, and it is sufficient to increase the number of the expansion / contraction portions 12t and the slits 12x even when a plurality of portions can be expanded and contracted as in the illustrated example. Moreover, since it is the structure which pinches | interposes the elastic expansion-contraction members 15-19 between two sheet | seat materials 12S and 12H like the exterior body 12 of the underpants type disposable diaper of the example of illustration, the slit 12x of this invention with respect to this. And when adding the expansion-contraction function by the expansion-contraction part 12t of the inner side sheet material 12H, it is not necessary to add a sheet material, and the expansion / contraction direction of arbitrary locations can be made into two or more directions. In addition, in this case, the contraction force can be made different between the expansion / contraction direction by the elastic expansion / contraction members 15 to 19 and the expansion / contraction direction by the expansion / contraction part 12t of the slit 12x and the inner sheet material 12H.

Position where the slit 12x and the stretch unit 12t can be appropriately determined but, elongated resilient and elastic members 15 to 19 are provided at intervals in the longitudinal direction along the width direction, tightening the Ri girth by its contraction force forms In the pants-type disposable diaper, the elastic structure of the elastic members 15 to 19 cannot be used to expand and contract in the front-rear direction (longitudinal direction). There is room for improvement in improving the fit to the anterior iliac spine and around the leg. Therefore, as shown in the figure, the stretchable structure of the present invention is provided on the waist opening WO side from the front-rear direction edge of the interior body 200 of the pants-type disposable diaper. It is one preferable embodiment that the waist opening side of the interior body 200 can be expanded in the vertical direction so as to cover the bulge. In addition to this (or instead of this), the stretchable structure of the present invention is provided on the side of the exterior body 12 from the side edge of the interior body 200, and the longitudinal stretch as shown by a two-dot chain line in FIG. It is possible to improve the fit to the buttocks, the iliac crest, the superior anterior iliac spine, the leg circumference, and the like. In the former case, the slit 12x is preferably wider than the entire width of the interior body 200, but can be narrower than the entire width of the interior body 200. In the latter case, the slit 12x is preferably continuous from the front body F to the back body B through the side seal portion 12A. However, from the viewpoint of ease of manufacture, the side seal portion 12A is not provided with the slit 12x. It is also a preferred form. The slit 12x can have an appropriate shape such as a curved shape or a staircase shape in addition to a linear shape along the width direction.

  In order to enable expansion / contraction of the expansion / contraction part 12t in the inner sheet material 12H and opening / closing of the slit 12x associated therewith, the outer sheet material 12S and the inner sheet material 12H are mutually or other depending on the structure of the portion to which the elasticity is applied. The joining to the member can be changed. For example, in the form shown in FIG. 9, when the slit 12x and the stretchable part 12t are provided on the waist opening WO side from the front-rear direction edge of the interior body 200 in the exterior body 12, the interior body is provided inside the stretchable part 12t of the inner sheet material 12H. 200 is positioned, the outer sheet material 12S is bonded to the outside of the inner sheet material 12H, and the folded portion 12r of the outer sheet material 12S is joined to the end of the interior body 200. 12t is a member located on the inner and outer sides of the inner body 200 and the outer sheet material 12S, and the inner sheet material 12H is located on the waist opening side of the stretchable portion 12t. Are not joined to the inner body 200 and the folded portion 12r of the outer sheet material 12S, but the inner sheet material 12H and the outer sheet material. 2S between are joined throughout the hot-melt adhesive (point pattern portion in the drawing). At the time of use, if a force is exerted so that the expansion / contraction part 12t is extended by a user's operation or a force applied at the time of wearing, the slit 12x opens along with the extension of the expansion / contraction part 12t as shown in FIG. After the straddling adhesive is divided, the non-joining region with respect to the inside of the inner sheet member rises, and the waist opening WO side rises from the slit 12x in the outer sheet member, thereby extending in the longitudinal direction as a whole. If a force that causes the expansion / contraction part 12t to contract due to a user's operation or the like (or if the expansion / contraction part 12t elastically expands and contracts as shown in FIG. 11 described later), the contraction force of the expansion / contraction part 12t ), And the opposite change contracts in the vertical direction as a whole.

  Further, as shown in FIG. 10, the side of the interior body 200 is located on the inner side of the stretchable portion 12t of the inner sheet material 12H, and the slit 12x and the stretchable portion 12t are provided, as shown in FIG. The outer sheet material 12S is bonded to the outer side of the inner sheet material 12H, the folded portion 12r of the outer sheet material 12S is also joined to the inner surface of the inner sheet material 12H, and a member is placed inside the expandable portion 12t of the inner sheet material 12H. Since it is not attached, the expansion / contraction part 12t of the inner sheet material 12H is not joined to the outer sheet material 12S, which is a member located outside thereof, and the entire area between the inner sheet material 12H and the outer sheet material 12S is a hot melt adhesive. Are joined together. In addition, although the site | part of the waist opening part side rather than the expansion-contraction part 12t in the inner side sheet material 12H is not joined to the folding | turning part 12r of the outer side sheet material 12S which is a member located in the inner side, even if this site | part is joined, good. At the time of use, if a force is exerted so that the expansion / contraction part 12t is extended by a user's operation or a force applied at the time of wearing, the slit 12x opens as the expansion / contraction part 12t extends as shown in FIG. After the adhesive straddling is divided, the waist opening WO side rises more than the slit 12x in the outer sheet member joined to the waist opening WO side rather than the stretchable part 12t of the inner sheet member, As a whole, it extends in the vertical direction. If a force that causes the expansion / contraction part 12t to contract by the user's operation, etc. (or if the expansion / contraction part 12t elastically expands and contracts as shown in FIG. 12 described later), the contraction force of the expansion / contraction part 12t ), And the opposite change contracts in the vertical direction as a whole. 9 and 10, the inner sheet material 12H and the outer sheet material 12S are joined together by a hot melt adhesive, but only the slit 12x portion is shown in FIGS. 5 and 6. Alternatively, it is also preferable that the inner sheet material 12H and the outer sheet material 12S are not joined not only to the portion of the slit 12x but also to at least one of the waist opening WO side and the crotch side.

  The stretchable portion 12t of the inner sheet material 12H is not particularly limited as long as it can be stretched in the direction intersecting the slit 12x (preferably the direction orthogonal), and is shown in FIGS. 5, 6, 9, and 10. As shown in FIG. 11, the portion corresponding to the slit 12 x in the inner sheet material 12 </ b> H may be folded back multiple times to form a bellows-like stretchable portion 12 t, or as shown in FIGS. 11 and 12, the inner sheet material By making 12H into a stretchable nonwoven fabric, a portion corresponding to the slit 12x in the inner sheet material 12H may be configured to be a stretchable portion 12t. In the former case, even if a material that does not expand and contract is used for the inner sheet material 12H, expansion and contraction is possible by opening and closing the folding of the bellows-shaped portion. Therefore, for example, when the expansion / contraction function by the slit 12x of the present invention and the expansion / contraction part 12t of the inner sheet material 12H is added to the conventional one-way expansion / contraction structure using the elongated elastic expansion / contraction members 15 to 19, the material is changed. The outer sheet material 12S and the inner sheet material 12H can be joined to each other or other members so that the slit 12x and the bellows-like portion can be formed without stretching, and the bellows-like portion can be expanded and contracted and the slit 12x can be opened and closed accordingly. Only structural changes are sufficient. On the other hand, in the latter case, since the stretchable nonwoven fabric is a material that elastically stretches in all directions, if this is used as the inner sheet material 12H, stretchability in all directions can be added at the slit 12x formation location. . In addition, when an elastic nonwoven fabric is used as the inner sheet material 12H, the outer sheet material 12S and the inner sheet material 12H are mutually or otherwise capable of forming slits 12x, expanding and contracting the elastic nonwoven fabric portion, and opening and closing the slits 12x associated therewith. The expansion / contraction function by the slit 12x of the present invention and the expansion / contraction part 12t of the inner sheet material 12H can be added only by changing the joining structure to the member. In the form shown in FIGS. 11 and 12, in order to form the stretchable portion 12t, the inner sheet material 12H and the outer sheet material 12S are not joined by the hot melt adhesive throughout, and only the portion of the slit 12x or The inner sheet material 12H and the outer sheet material 12S are not joined not only to the portion of the slit 12x but also to at least one of the waist opening WO side and the crotch side.

Here, the stretchable nonwoven fabric means a material that elastically stretches and contracts by itself, in particular, has an elongation of at least 50% and recovers to the original length after stress release, that is, has a low distortion characteristic. preferable. More specifically, the elongation rate under a load of 10 N / 50 mm is 50% or more, and the residual strain rate after 50% elongation is 25% or less, preferably 10% or less. Further, it is preferable that the return stress (return power) at an elongation rate of 40% is 1.0 N / 50 mm or more, particularly 2.5 N / 50 mm or more. The elongation rate under load and the return stress during elongation are measured by a tensile test. In the tensile test, a tensile tester (AUTOGRAPH AGS-G100N manufactured by SHIMADZU) is used at room temperature, the width of the test piece is 50 mm (length 200 mm), and the distance between chucks (gripping tools) is 150 mm (no looseness). State) and the tensile speed is 500 mm / min. The elongation rate under a load of 10 N / 50 mm is to pull the sample until the stress starts from 0 N and reaches 10 N or more (for example, 11 N), and records the relationship between the distance between the chucks and the stress. It calculates | requires by following Formula (1) from the distance L1 between chuck | zippers. When the sheet breaks before the stress reaches 10 N, the distance between chucks at the time of breakage is calculated as L1.
Elongation rate under load (%) = {(L1-150) / 150} × 100 (1)
The return stress when the elongation rate is 40% is the distance between the chucks, starting from 150 mm between the chucks and pulling the sample until it reaches 225 mm and immediately returning (without stopping) to 150 mm (at the same speed). The stress is recorded when the distance between chucks returns from 225 mm (50% stretched state) to 210 mm (40% stretched state).
Further, the residual strain rate after 50% elongation is obtained by the following equation (2) from the inter-chuck distance L2 when the stress becomes 0 (or less than 0.005N) during the return stress measurement.
Residual strain rate (%) = {(L2-150) / 150}... 100 (2)

(Other)
In the illustrated embodiment, the outer sheet material 12S corresponds to the first sheet material of the present invention, and the inner sheet material 12H corresponds to the second sheet material of the present invention, but the inside and outside are reversed, that is, the inner sheet material 12H is slit. It is also possible to provide 12x as the first sheet material of the present invention, and to provide the second sheet material by providing the outer sheet material 12S with the stretchable portion 12t.

In the illustrated embodiment, the slit 12x is provided. However, a perforation for forming the slit 12x is provided, and the user cuts the perforation as necessary to form the slit 12x so that it can be expanded and contracted. Is also possible. As is well known, a perforation is a line in which cut portions (cut portions) and tie portions (portions connected without being cut) are alternately arranged to form a dotted line. In addition to those, a plurality of parallel rows may be provided. When the shape of the slit formed by the perforations is curved or stepped, all known perforations such as making the perforation cut direction along the slit direction or arranging the cut parts in a stepped manner Can be adopted. Although the length of the cut part and the tie part in the perforation can be determined as appropriate, it is desirable that the breaking strength is in the range of 9.8 to 29 N / 25 mm.

  The illustrated form is based on the premise of having an elongated elastic elastic member 15 to 19 between the outer sheet material 12S and the inner sheet material 12H, and the elasticity by the slit 12x and the elastic part 12t is added in the direction intersecting this. However, it is also possible to construct a stretchable structure by the slit 12x and the stretchable portion 12t of the present invention in a portion that does not have the elastic stretchable members 15-19.

  The extension / contraction direction of the extension / contraction part 12t can be not only the orthogonal direction but also an oblique direction as long as it is a direction that intersects at least the slit 12x.

  Unlike the illustrated embodiment, slits 12x and the like are provided in a direction intersecting with the elastic elastic members 15 to 19 (for example, a direction orthogonal thereto), and the elastic expansion members 15 to 19 are extended and contracted by the slit 12x and the elastic part 12t of the present invention. Sex can also be added.

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

  ・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.

-"Thickness" is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 0.098 N / cm ² and pressure area: 2 cm ² .

  The present invention is suitable for an exterior body of a pants-type disposable diaper as in the above example, but can be applied not only to a tape-type or pad-type disposable diaper but also to absorbent articles in general such as a sanitary napkin. Also, it can be applied to other than the exterior body.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious back sheet, 12 ... Exterior body, 12r ... Folded part, 12t ... Stretch part, 12x ... Slit, 15-19 ... Elastic stretch member, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet , 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Solid gather, 62 ... Gather sheet, 12S ... Outer sheet material, 12H ... Inner sheet material, F ... Front body, B ... Rear body, LO ... Leg opening, WO ... waist opening, 12A ... side seal part.

Claims (5)

A first sheet material, a second sheet material facing one surface of the first sheet material, and a slit provided in the first sheet material along a direction intersecting the expansion / contraction direction or for forming the slit With perforations,
The portion corresponding to the slit or perforation in the second sheet material is at least a stretchable portion that can be stretched in a direction intersecting the slit,
The expansion / contraction part of the second sheet material is configured to expand and contract with the opening and closing of the slit of the first sheet material,
Between the first sheet material and the second sheet material, a plurality of elongated elastic stretch members are juxtaposed at intervals, and at least both ends of the elastic stretch members are the first sheet material and the second sheet material. It is fixed to two sheet materials,
The slit or perforation is formed between the elastic elastic members along the extending direction of the elastic elastic members.
An elastic structure of an absorbent article characterized by the above. A first sheet material, a second sheet material facing one surface of the first sheet material, and a slit provided in the first sheet material along a direction intersecting the expansion / contraction direction or for forming the slit With perforations,
The portion corresponding to the slit or perforation in the second sheet material is at least a stretchable portion that can be stretched in a direction intersecting the slit,
The expansion / contraction part of the second sheet material is configured to expand and contract with the opening and closing of the slit of the first sheet material,
The portion corresponding to the slit or perforation in the second sheet material is bent back multiple times to form an accordion shape, thereby forming the stretchable portion.
An elastic structure of an absorbent article characterized by the above . A first sheet material, a second sheet material facing one surface of the first sheet material, and a slit provided in the first sheet material along a direction intersecting the expansion / contraction direction or for forming the slit With perforations,
The portion corresponding to the slit or perforation in the second sheet material is at least a stretchable portion that can be stretched in a direction intersecting the slit,
The expansion / contraction part of the second sheet material is configured to expand and contract with the opening and closing of the slit of the first sheet material,
When the second sheet material is an elastic nonwoven fabric, a portion corresponding to the slit or perforation in the second sheet material is the elastic portion.
An elastic structure of an absorbent article characterized by the above . An absorptive article provided with the elastic structure of an absorptive article given in any 1 paragraph of Claims 1-3 . An exterior body that constitutes the front body and the back body, and an interior body including an absorbent body provided inside the exterior body, both sides of the exterior body in the front body and both sides of the exterior body in the back body, Is a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed by forming a side seal part by being joined together,
The slit or perforation, and the elastic elastic member are arranged in the width direction on at least one of the waist opening side from the front-rear direction edge of the interior body in the exterior body and the side from the side edge of the interior body in the exterior body. The stretchable structure of the absorbent article according to claim 1 is provided so that
An absorbent article characterized by the above .

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