JP6192003B2 - Elastic structure of absorbent articles - Google Patents

Description

  The present invention relates to a stretchable structure of an absorbent article formed by fixing an elongated elastic stretchable member between stretched sheet materials in an expanded state.

  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 1-4).

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 in the width direction and fixed in an extended state, it is practiced to form a telescopic structure of the body circumferential up direction.

  In a disposable diaper, when using an elongated elastic elastic member to ensure fit, it is desirable to arrange the elastic elastic member in a straight line from the viewpoint of ease of manufacture, but that alone is curved like the leg circumference. There is a risk that the fit to a difficult part will be insufficient. In order to improve such a fitting property in the oblique direction, conventionally, elastic elastic members have been attached in a curved shape along the oblique direction, particularly around the legs (see, for example, Patent Documents 5 to 7). .

  However, when attaching such an elastic stretchable member in the oblique direction, it is necessary to fix the elastic stretchable member continuously in the continuous direction. There is also a problem in terms of manufacturability, such as the need to swing and attach, and the manufacturing equipment becomes complicated accordingly.

JP 2008-295930 A JP 2009-297096 A JP 2009-148447 A JP 2010-22588 A JP 2009-148447 A JP 2009-207698 A JP 2010-29893 A

  Therefore, a main object of the present invention is to provide a stretchable structure which is excellent in flexibility and easy to manufacture while the elastic stretchable member is along the oblique direction in the product state and the mounted state.

  The present invention that has solved the above problems is as follows.

  <Invention of Claim 1>

The first sheet material, the second sheet material facing one surface of the first sheet material, and the first sheet material and the second sheet material are provided along the expansion / contraction direction and spaced apart from each other. Provided with a plurality of elongated elastic stretch members,
The first sheet material and the second sheet material are arranged in an expanded state intermittently in the extending direction of the elastic elastic member, and an oblique direction in which the acute angle crossing angle with respect to the extending direction of the elastic elastic member is greater than 45 degrees Are joined by a continuous adhesive or welding process to form a sheet joint,
The sheet joint portion is a portion that continues in a curved shape across the plurality of elastic elastic members from one side to the other side,
The elastic elastic member is fixed to at least one of the first sheet material and the second sheet material at a position intersecting with the sheet joint portion,
The first sheet material and the second sheet material contract as the elastic elastic member contracts, so that the portions located between the sheet joint portions in the first sheet material and the second sheet material swell in opposite directions. Rutotomoni have folds are formed respectively, resilient and elastic members contraction state ing an oblique direction a and curved,
An elastic structure of an absorbent article characterized by the above.

(Function and effect)
Combining such a fixing pattern of the sheet joining portion and the fixing position of the elastic expansion / contraction member results in the direction of the elastic expansion / contraction member in the contracted state being oblique with respect to the extending direction of the elastic expansion / contraction member in the expanded state. . This is because when the first sheet material and the second sheet material contract as the elastic expansion / contraction member contracts from the expanded state, the direction in which the adjacent sheet joints are naturally gathered is relative to the contraction direction of the elastic expansion / contraction member. The first sheet material and the second sheet material are deformed so that the displacement in these directions can be balanced (the rectangular shape as will be described later) due to misalignment (intersecting so that the acute angle crossing angle is greater than 45 degrees). If it is a region, the side on one side of the expansion / contraction direction will be like a parallelogram shifted in parallel to the side on the other side), and as a result, the direction of the elastic expansion / contraction member in the contracted state will be an oblique direction. is there. In this stretchable structure, the direction of the elastic stretchable member does not become oblique when fully stretched, but the absorbent article is not intended to be used or distributed in the stretched state, and is in the product state (natural length state) and wearing state. Then, the direction of the elastic expansion / contraction member becomes an oblique direction, and fit along the oblique direction can be obtained. In addition, such a structure is possible only by changing the pattern of the sheet joining portion, and the pattern is also intermittent, so that the flexibility of the first sheet material and the second sheet material is reduced little.

  In the above-mentioned Patent Document 1 and the like, when the sheet joining portions are arranged in a staggered manner, the sheet joining portions are arranged in an oblique direction. In this case, the first sheet material and the elastic stretching member intersect with the sheet joining portions. Since it is not fixed to at least one of the second sheet materials, the deformation as in the present invention does not occur, and only a cloud-like or corrugated ridge that is continuous in the longitudinal direction is formed.

  The term “oblique direction” means that a direction perpendicular to the reference direction is not included.

  Further, in the present invention, the welding process for forming the sheet joint portion is continuous. The first sheet material and the second sheet material are used as long as the welding marks are continuous in at least one of the first sheet material and the second sheet material. And the elastic expansion / contraction member are welded to each other, and the first sheet material and the second sheet material are indirectly welded, so that the welding is continued, and the elastic portion is elastic at a portion where the sheet joining portion and the elastic expansion / contraction member intersect. It includes a form in which welding between the first sheet material and the second sheet material is not continuous because the elastic member is interposed.

  In addition, the elastic elastic member is fixed to the sheet at a position where it intersects with the sheet joint portion. The elastic elastic member and the sheet are bonded at the position where the elastic elastic member and the sheet joint portion intersect (adhesion with an adhesive). In addition, the elastic expansion / contraction member and the sheet are not bonded to each other, but the interval between the sheet joints in the direction intersecting the expansion / contraction direction is a natural part of the elastic expansion / contraction member. Also included is a mode in which the elastic contraction force of the elastic expansion / contraction member is transmitted to the sheet at a position where it intersects with the sheet bonding portion as a result of being fixed by being sandwiched between the sheet bonding portions and being narrower than the long-time thickness. It is. The latter form is, for example, the form described in Japanese Patent Application Laid-Open Nos. 2008-154998 and 2009-106667, and the Patent Documents 1 to 3 are disclosed in that the design position of the side portion of the elastic member passes through the sheet joint portion. Different from those described.

In addition, when the sheet joint portion has a curved shape, the elastic elastic member in the contracted state is oblique and curved with respect to the extending direction of the elastic elastic member in the expanded state. This is particularly preferable for a portion where curved fitting properties such as the above are required.

<Invention of Claim 2 >
The first sheet material and the second sheet material have a plurality of regions corresponding to the parts of the wearer's body, the continuous direction of the sheet joint portion in any one region is an oblique direction, and the other The stretchable structure of an absorbent article according to claim 1, wherein the continuous direction of the sheet joint portion in any one of the regions is different from this.

(Function and effect)
Since the fit shape of the absorbent article differs depending on the part of the wearer's body, as described above, it is desirable that the continuous direction of the sheet joint portion is a direction different from other regions depending on the region.

<Invention of Claim 3 >
The first sheet material, the second sheet material facing one surface of the first sheet material, and the first sheet material and the second sheet material are provided along the expansion / contraction direction and spaced apart from each other. Provided with a plurality of elongated elastic stretch members,
The first sheet material and the second sheet material are arranged in an expanded state intermittently in the extending direction of the elastic elastic member, and an oblique direction in which the acute angle crossing angle with respect to the extending direction of the elastic elastic member is greater than 45 degrees Are joined by a continuous adhesive or welding process to form a sheet joint,
The elastic elastic member is fixed to at least one of the first sheet material and the second sheet material at a position intersecting with the sheet joint portion,
The first sheet material and the second sheet material contract as the elastic elastic member contracts, so that the portions located between the sheet joint portions in the first sheet material and the second sheet material swell in opposite directions. Absorbent articles with stretchable structures, each having a ridge,
The absorbent article includes an exterior body constituting a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body, in both sides of the exterior body in the front body and in the back body by the side seal portion and both side portions of the outer body is joined, respectively, are formed, together with the girth Ri portion is formed in an annular shape, the waist opening and pair of leg openings formed, pants-type Disposable diapers,
The stretchable structure is provided in a region including at least both sides in the width direction of the interior body in the exterior body so that the elastic stretchable member is in the width direction,
The sheet joint portions are respectively provided on the left and right sides of the interior body in the front body so as to be obliquely left upward and obliquely upward when viewed from the outside of the absorbent article, respectively, and on the left side of the interior body in the back body And on the right side, respectively provided obliquely downward left and obliquely downward right as seen from the outside of the absorbent article,
An absorbent article characterized by the above .

(Function and effect)
The stretchable structure having the sheet joint portion that is continuous in the oblique direction is suitable for the region located at least on both sides in the width direction of the interior body in the exterior body of the pants-type disposable diaper as described above. As described above, the fit to the legs and the buttock is improved in the front body, and the fit that wraps the bulge of the buttock is obtained in the back body. Moreover, although it was unexpected at the beginning, the edge of the waist opening of the front body is displaced relative to the crotch side relative to the edge of the waist opening of the back body. That is, due to the deforming action of the present invention, the side seal portion is shifted downward with respect to the waist opening in the rear body, and the intermediate portion having the inner body is further shifted downward with respect to the side seal portion in the front body. Structure. Such a structure is very preferable because the front body fits without pressing the swollen stomach of the baby and the back body can cover the buttocks firmly to the waist.

  As described above, according to the present invention, there are advantages such that the elastic elastic member is in the oblique direction in the product state and the mounted state, but is excellent in flexibility and easy to manufacture.

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 line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. (A) a plan view in an unfolded state, and (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in an extended state, and (d) a 7-7 cross-sectional view showing a stretchable structure. It is. 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. (A) a plan view in an unfolded state, and (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in an extended state, and (d) a 7-7 cross-sectional view showing a stretchable structure. It is. (A) a plan view in an unfolded state, and (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in an extended state, and (d) a 7-7 cross-sectional view showing a stretchable structure. It is. It is a top view in the state where the diaper was developed showing the outer surface 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. It is a top view in the state where the diaper was developed showing the outer surface 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. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. (A) When the crossing angle is 90 degrees, (b) When the acute side crossing angle is 30 degrees, (c) When the acute side crossing angle is 45 degrees, (d) The acute side crossing angle is 65 degrees, and (e) The acute side crossing angle is 75 degrees. It is the photograph which shows the expansion | deployment state and shrinkage | contraction state (natural length state) in each sample in the case of degree. It is the photograph of the sample front (ventral side) of a natural length state. It is the principal part enlarged photograph of the sample front (ventral side) of a natural length state. It is the photograph of the sample front (back side) of a natural length state. It is the principal part enlarged photograph of the sample front (back side) of a natural length state.

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, and symbol X indicates the total width of the diaper.

The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior body 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive. The “front-rear direction” means the direction connecting the ventral side (front side) and the back side (rear side), “width direction” means the direction (left-right direction) orthogonal to the front-rear direction, and “up-down direction mounting state of the diaper 100 and ", i.e. a direction perpendicular to the cylinder circumferential up direction when the diaper 100 to superimpose the front body side portions and the back body weight side was folded in two at the crotch portion of the diaper 100, In other words, it means the direction connecting the waist opening WO side and the crotch 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 sheet 11, and an absorption element 50 interposed therebetween. Yes, 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 the three-dimensional gather 60 is provided, both sides of the top sheet 30 pass between the liquid-impermeable sheet 11 and the three-dimensional gather 60 to the back side of the absorbent element 50 to prevent the liquid from penetrating. It is preferable to adhere to the impermeable 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.

(Liquid impervious sheet)
The material of the liquid-impermeable 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 provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified. For the liquid-impermeable 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 Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

  The liquid-impermeable sheet 11 is preferably extended around both sides of the absorbent element 50 to both sides of the side surface 30 of the absorbent element 50 in order to improve leakage prevention. 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 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 the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion rises obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  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. An end portion of the three-dimensional gather 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the topsheet 30 through the side portion of the interior body 200 and are hot-melted to the side surface of the topsheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 along the front-rear direction is fixed to the free part in an extended state.

The gather sheet 62 is made of a spunbonded nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 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 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) 66w is It is preferably 15 to 60 mm, particularly 20 to 40 mm. Further, the distance 60d between the folds located on the innermost side in a state where the three-dimensional gather 60 is 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.

  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 crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. 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.

Although the absorbent body 56 may be rectangular, as shown in FIG. 6, as shown in FIG. 6, 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 particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. 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 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.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

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 side part and the back side part thereof are the front body F and the back body part. B means each.

Exterior body 12, the side seal portion of the longitudinal extent (front body F of the front and rear and the body peripheral Ri portion T that is determined as a direction range, portions for forming the leg openings LO extending from the waist opening WO to upper ends of the leg openings LO And an intermediate portion L defined as a front / rear direction region having a side seal portion 12A of the back 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 FIGS. 3 to 6, the exterior body 12 is formed by joining two sheet materials 12 </ b> S and 12 </ b> H, and the second sheet material 12 </ b> H located on the inner side is formed of the waist opening WO. Although extending only to the edge, the first sheet material 12S located on the outer side wraps around the edge on the waist side of the second sheet material 12H and is folded back to the inner side. It extends so that it may cover even to the waist side edge part.

  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.

Then, the exterior body 12, in order to increase the girth Rinitaisuru fit, both sheet materials 12S, elongated resilient and elastic members 15 to 17 rubber threads are used between 12H is provided at a predetermined extension ratio. As the elongated elastic elastic members 15 to 17, synthetic rubber or natural rubber may be used.

More specifically, the entire width direction is continuous between the inner surface of the second sheet material 12H and the outer surface of the folded portion 12r of the first sheet material 12S at the waist edge W of the back body B and the front body F. As described above, the plurality of waist edge elastic elastic members 17 are fixed in a state of being spaced apart in the vertical direction and extended along the width direction at a predetermined extension rate. 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 second sheet material 12H and the inner side surface of the first sheet material 12S in the lower waist portion U of the front body F and the back body B, except for the central portion in the width direction overlapping the interior body 200, A plurality of lower waist elastic elastic members 15 made of an elongated elastic elastic member are continuously provided over the entire width direction on each of the upper side and both sides in the width direction, with a predetermined elongation rate at intervals in the vertical direction. It is fixed in the state extended | stretched along the width direction.

The waist lower elastic elastic member 15 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 1. It is preferable to fix the thread rubber of about 0 mm ^{2 at} a spacing of 1 to 15 mm, particularly 3 to 8 mm, and an elongation rate of 200 to 350%, particularly about 240 to 300%.

  In addition, between the outer side surface of the second sheet material 12H and the inner side surface of the first sheet material 12S in the intermediate portion L of the front body F and the back body B, except for the center portion in the width direction overlapping the interior body 200, A plurality of intermediate elastic expansion / contraction members 16 made of an elongated elastic expansion / contraction member are provided in each part on both sides in the width direction so as to be continuous over the entire width direction. It is fixed in a stretched state along the direction.

The intermediate elastic elastic member 16 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 1. It is preferable to fix the thread rubber of about 0 mm ² ) at intervals of 5 to 40 mm, particularly 5 to 20 mm, and stretch ratios of 150 to 300%, particularly 180 to 260%, respectively.

  As shown in the figure, when the waist lower elastic elastic members and the intermediate elastic elastic members 15 and 16 are provided on both sides in the width direction except for the central portion in the width direction overlapping the inner body 200, the inner body 200 is provided. Will not shrink more than necessary in the width direction, and it will not look bad or absorb. 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 waist lower elastic members 15 and 16 is not limited to the above example, and the waist lower elastic members and the waist lower elastic members so that the elastic force acts over the entire width of the waist lower U. Part or all of the intermediate elastic elastic members 15 and 16 can be provided from one side in the width direction to the other side across the interior body 200.

(External body split structure)
In the above-described example, the front body F to the back body B are continuously covered by the integrated exterior body 12, but the abdominal part exterior body and the back part exterior body are continuously located on the crotch side. In this case, the outer surface of the interior body covers a portion exposed between the exterior body of the abdominal side portion and the exterior body of the back side portion. A crotch outer body can also be attached. As the crotch outer casing, the same materials as those used for the outer casing described above can be used.

(About stretchable structure)
In this pants-type disposable diaper, a specific stretch structure is adopted in a region from the lower waist portion U to the middle portion L. That is, as shown in FIG. 6A, the first sheet material 12 </ b> S and the second sheet material 12 </ b> H are intermittently arranged in the extending direction of the elastic elastic members 15 and 16 in the expanded state. The sheet joining portion 70 is joined by an adhesive 71 (hot melt adhesive or the like) that is continuous with a predetermined width in an oblique direction in which the acute angle crossing angle with respect to the extending direction of the elastic elastic members 15 and 16 is greater than 45 degrees. Is formed.

Although the raw material of the 1st sheet material 12S and the 2nd sheet material 12H is not specifically limited, It is desirable that it is especially a nonwoven fabric with thickness of 0.1-1.0 mm and a fabric weight of 10-20 g / m < ² >. In addition, the 1st sheet material 12S and the 2nd sheet material 12H are each comprised from the nonwoven fabric of one sheet, and either or both may be a laminated body of the nonwoven fabric of several sheets.

  The elastic elastic members 15 and 16 are fixed to at least one of the first sheet material 12 </ b> S and the second sheet material 12 </ b> H by an adhesive 71 at a position intersecting with the sheet bonding portion 70. In order to fix the elastic elastic members 15 and 16, an adhesive different from that for forming the sheet joint portion can be applied to the elastic elastic members or sheet materials 12S and 12H. However, in the illustrated embodiment, the sheet joint portion 70 is formed. Since the adhesive 71 is continuous in the direction intersecting the expansion / contraction direction, the elastic expansion / contraction members 15 and 16 are used as at least one of the first sheet material 12S and the second sheet material 12H using the adhesive 71. It is fixed. At the time of manufacture, the adhesive 71 is applied to one or both of the first sheet material 12S and the second sheet material 12H, and when the both sheet materials 12S and 12H are joined, the elastic elastic members 15 and 16 are attached to the both sheet materials 12S. , 12H.

  In the form shown in FIG. 6, the adhesive 71 is continuously applied to the surface of the first sheet material 12S on the second sheet material 12H side intermittently in the expansion / contraction direction and with a predetermined width in the direction intersecting the expansion / contraction direction. The elastic elastic members 15 and 16 are extended between the first sheet material 12S and the second sheet material 12H without applying the adhesive 71 on the surface of the second sheet material 12H on the first sheet material 12S side. The first sheet material 12S and the second sheet material 12H, and the first sheet material 12S and the elastic elastic members 15 and 16 are joined by an adhesive 71, respectively. In this case, among the portions where the sheet joining portion 70 and the elastic elastic members 15 and 16 intersect, the adhesive 71 is continuous in the direction intersecting with the elastic direction on the first sheet material 12S side of the elastic elastic members 15 and 16. As a result, the elastic stretch members 15 and 16 are fixed to the first sheet material 12S, and the adhesive 71 is discontinuous in the direction intersecting the stretch direction on the second sheet material 12H side of the elastic stretch members 15 and 16. In the figure, this discontinuous portion is indicated by reference numeral 72. Since the adhesive 71 is intermittently present in the second sheet material 12H, the decrease in flexibility of the second sheet material 12H, and thus the decrease in flexibility of the first sheet material 12S and the second sheet material 12H as a whole is suppressed. it can. Further, although the elastic elastic members 15 and 16 are crossed with the sheet joining portion 70, the adhesive 71 is continuous only on the first sheet material 12S side. Since the sheet material 12S and the second sheet material 12H are integrated, the contraction force of the elastic elastic members 15, 16 acts substantially the same as that of the first sheet material 12S and the second sheet material 12H, and the first sheet material Equal wrinkles can be formed on both 12S and the second sheet material 12H.

  In addition, it is also possible to apply the adhesive 71 in the same pattern to the first sheet material 12S and the second sheet material 12H. In this case, as shown in FIG. 9, among the portions where the sheet joining portion 70 and the elastic elastic members 15 and 16 intersect, the elastic sheet members 15 and 16 on the first sheet material 12S side and the second sheet material 12H side. In both cases, the adhesive 71 is continuous with a predetermined width in a direction intersecting with the expansion / contraction direction, so that there is an advantage that the elastic expansion / contraction members 15 and 16 can be more firmly fixed. Although not shown, it is also possible to apply an adhesive to the second sheet material, and to fix the first sheet material by inserting an elastic elastic member without applying the adhesive. However, in these forms, since the adhesive 71 is continuous in the second sheet material 12H, not only the flexibility of the second sheet material 12H itself to be brought into contact with the skin is lowered, but also the reduced portion of the flexibility is an elastic elastic member. Since it presses against skin by 15 and 16, it is not so preferable. Therefore, it is desirable that the adhesive 71 is not continuous on the side having a surface that comes into contact with the wearer's skin like the second sheet material 12H as shown in FIG.

  Moreover, as shown in FIG. 10, the sheet | seat junction part 70 can also be formed by a welding process. The welded portion is indicated by reference numeral 75. As the welding process, a known processing method such as heat sealing or ultrasonic welding can be employed. Here, the welding process for forming the sheet joining portion 70 is continuous. As long as the welding traces of at least one of the first sheet material 12S and the second sheet material 12H are continuous, the first sheet material 12S and the second sheet material are formed. The sheet material 12H and the elastic elastic members 15 and 16 are welded to each other, and the first sheet material 12S and the second sheet material 12H are indirectly welded. It includes a form in which the welding between the first sheet material 12S and the second sheet material 12H is not continuous because the elastic elastic members 15 and 16 are interposed at the portion 72 where the elastic members 15 and 16 intersect. For example, in a state where the elastic elastic members 15 and 16 are sandwiched between the first sheet material 12S and the second sheet material 12H, welding is performed in a continuous pattern across the elastic elastic members 15 and 16 by heat sealing or ultrasonic welding. When the first sheet material 12S and the second sheet material 12H are melted without melting the elastic elastic members 15 and 16, the first sheet material 12S and the second sheet material 12H and the elastic elastic members 15 and 16 are not welded. Therefore, it becomes the latter form.

  The elastic elastic members 15 and 16 are fixed to at least one of the first sheet material 12 </ b> S and the second sheet material 12 </ b> H at a position intersecting with the sheet bonding portion 70. In this fixed form, the elastic elastic members 15 and 16 and the sheet are bonded to each other at the position where the elastic elastic members 15 and 16 and the sheet joint portion 70 intersect (only bonding by the adhesive 71 such as the hot-melt adhesive 71). In addition to the welded form, the elastic elastic members 15 and 16 are not bonded to the sheet, but the distance between the sheet joints 70 in the direction intersecting the expansion and contraction direction is the elastic elastic member 15. , 16 is narrower than the natural length, and is fixed by the elastic elastic members 15, 16 being sandwiched between the sheet bonding portions 70, so that the contraction force of the elastic elastic members 15, 16 is A form (see Japanese Patent Application Laid-Open No. 2008-154998 and Japanese Patent Application Laid-Open No. 2009-106667) transmitted to the sheet at the intersecting position is also included. More specifically, in the latter form, as shown in FIG. 9 (a), the elastic sheet members 15 and 16 extended to a higher expansion rate than the fixed expansion rate are provided with the first sheet material 12S and the second sheet material. In a state of being sandwiched between 12H, the sheet joining portion 70 is welded in a continuous pattern across the elastic elastic members 15 and 16 by heat sealing or ultrasonic welding, and the first without stretching the elastic elastic members 15 and 16. Without melting the sheet material 12S and the second sheet material 12H and welding the first sheet material 12S and the second sheet material 12H and the elastic elastic members 15, 16, as shown in FIG. The elastic elastic members 15 and 16 can be manufactured by releasing the tension, contracting the elastic elastic members 15 and 16 to expand the diameter, and sandwiching the elastic elastic members 15 and 16 between the sheet joining portions 70. Thereby, in the stretchable structure to be manufactured, at least one of the first sheet material 12 </ b> S and the second sheet material 12 </ b> H is continuously welded, but at the portion where the sheet joining portion 70 and the elastic stretchable members 15, 16 intersect. Since the elastic elastic members 15 and 16 are interposed, the welding between the first sheet material 12S and the second sheet material 12H is not continuous, and the elastic elastic members 15 and 16 are fixed by being sandwiched between the sheet joint portions 70. It will be in the form.

  However, if the sheet bonding part 70 is formed by welding, hard streaks continue and a decrease in flexibility is inevitable, but if the sheet bonding part 70 is formed by the adhesive 71, a decrease in flexibility due to material welding occurs. Without being more flexible.

  The width 70w in the expansion / contraction direction of each sheet bonding portion 70 and the interval 70d between the adjacent sheet bonding portions 70 can be determined as appropriate, but the width 70w in the expansion / contraction direction of each sheet bonding portion 70 is 4 mm or less (particularly 2 mm or less). It is also preferable that the interval 70d between the adjacent sheet joining portions 70 is 4 to 8 mm (particularly 5 to 7 mm).

  The distances 15d and 16d between the adjacent elastic elastic members 15 and 16 can be determined as appropriate. However, if the distance exceeds 10 mm, the thickness of the flange 80 changes in a direction crossing the expansion / contraction direction, although not as long as the longitudinal intermittent joining form. For this reason, the distances 15d and 16d between the elastic elastic members 15 and 16 adjacent to each other are preferably 10 mm or less, particularly 3 to 8 mm.

  The thickness and elongation rate of the elastic elastic members 15 and 16 (elongation rate when the elastic structure is fully deployed) may be appropriately selected according to the mounting position of the elastic elastic members 15 and 16, and the preferred range is as follows. As described above. In general, it is desirable that the elastic elastic members 15 and 16 have a thickness of about 200 to 1000 dtex and an elongation rate of about 200 to 300%.

  In the expansion / contraction structure described above, as the elastic expansion / contraction members 15 and 16 contract, as shown in FIG. 6B, a portion located between the sheet joining portions 70 in the first sheet material 12S and the second sheet material 12H. Respectively contract and swell in opposite directions to form a ridge 80. FIG. 6 (b) shows a natural length state, but the elastic elastic members 15 and 16 are stretched to some extent from this state when worn, and as shown in FIG. The height 80h of the ridge 80 is lowered. This stretchable structure has a highly continuous ridge 80 and is excellent in air permeability and appearance.

  Then, the elastic elastic members 15 and 16 are fixed to at least one of the first sheet material 12S and the second sheet material 12H at a position where they intersect with the sheet bonding portion 70, and in a deployed state, the continuous direction of the sheet bonding portion 70 When the acute angle crossing angle θ with the extending direction of the elastic elastic members 15 and 16 is greater than 45 degrees, the extended elastic elastic members 15 and 1619 in the unfolded state as shown in FIGS. The direction of the elastic elastic members 15 and 16 in a contracted state with respect to the direction is an oblique direction. This is because when the first sheet material 12S and the second sheet material 12H are contracted in accordance with the contraction of the elastic elastic members 15 and 16 from the expanded state, the direction in which the adjacent sheet joining portions 70 are naturally brought together 80 is elastic. The first sheet member 12S and the second sheet member 12S and the second sheet member 12S are balanced so as to be balanced with respect to the contraction direction of the expansion members 15 and 16 (crossing so that the acute angle crossing angle θ is larger than 45 degrees). The sheet material 12H is deformed (in the case of a rectangular region as shown in the figure, the side on the one side in the expansion / contraction direction is a parallelogram in which the side on the other side is displaced in parallel to the other side), and as a result, the elasticity in the contracted state The direction of the elastic members 15 and 16 is an oblique direction. In this stretchable structure, the elastic stretchable members 15 and 16 do not have an oblique direction in the fully deployed state, but the absorbent article is not used or distributed in the deployed state, and is in a product state (natural length state). In the mounted state, the directions of the elastic elastic members 15 and 16 are oblique directions, and a fit property along the oblique directions can be obtained. In addition, such a structure is possible only by changing the pattern of the sheet joining portion 70, and the pattern is also intermittent, so that the flexibility of the first sheet material 12S and the second sheet material 12H is reduced little. . On the other hand, when the acute angle side crossing angle θ is 45 degrees or less, as shown in FIGS. 16 (a) and 16 (b), the result is that the elastic elastic members 15 and 16 are close to being continuously fixed in the continuous direction. In addition, the flange 80 that is continuous in the continuous direction of the sheet joining portion 70 is not formed, and the direction of the elastic elastic members 15 and 16 in the contracted state hardly changes with respect to the extending direction of the elastic elastic members 15 and 16 in the expanded state.

  In the unfolded state, the acute angle side crossing angle θ between the continuous direction of the sheet joint portion 70 and the extending direction of the elastic elastic members 15 and 16 is not particularly limited as long as it is 45 degrees or more (below 90 degrees because it is an acute angle). Preferably it is 50 to 85 degrees, more preferably 55 to 80 degrees, and particularly preferably 60 to 75 degrees.

  The pattern of the sheet joint portion 70 can be determined as appropriate. However, when the pattern is applied to a region including at least both sides in the width direction of the interior body 200 in the exterior body 12 of the pants-type disposable diaper as illustrated, the sheet joint portion 70 is used. The left and right sides of the interior body 200 in the front body F are respectively provided obliquely upward left and right upward as viewed from the outside of the diaper, and the left and right sides of the interior body 200 in the back body B are viewed from the outside of the diaper. If the front body F is provided in the left diagonal downward direction and the right diagonal downward direction, the front body F has improved fit to the leg and the buttock, and the rear body B has a fit that wraps the bulge of the buttock.

  17 to 20 are photographs of the sample in the form shown in FIG. 2, and the elastic elastic members 15 and 16 are not inclined as much as the state shown in FIG. 16, but these are the front body F and the back body B. The diagonal direction of the sheet joint 70 is opposite, the front body F and the back body B are connected by the side seal portion 12A, the deformation of the front body F and the deformation of the back body B cancel each other, and the interior This is because the rigidity of the portion having the body 200 is high, and the amount of contraction by the waist edge elastic elastic member 17 is larger than the amount of contraction by the elastic elastic members 15 and 16. However, when taking account of such influences, the exterior body 12 is deformed so that the elastic elastic members 15 and 16 are oriented in an oblique direction in accordance with the direction of the sheet joining portion 70, and it is initially expected. Although it was not, it is understood that the edge WOF of the waist opening WO of the front body F is shifted to the crotch side relative to the edge WOB of the waist opening WO of the back body B. That is, due to the deforming action of the present invention, the side seal portion 12A is shifted downward with respect to the waist opening WO in the rear body B, and the interior body 200 is further provided with respect to the side seal portion 12A in the front body F. The middle part was shifted downward. Such a structure is very preferable because the front body F fits without squeezing the infant's swollen stomach and the back body B can cover the buttocks firmly to the waist.

  Although it is preferable that the sheet joining portion 70 has a straight shape, as shown in FIG. 11, when the sheet joining portion 70 has a curved shape (in the illustrated example, an arc shape), the elastic elastic member 15 in an unfolded state, Since the elastic elastic members 15 and 16 in a contracted state with respect to the extending direction of the 16 are inclined and curved, a curved fitting property such as a leg circumference, a buttock, and a bulge of a buttock as in the illustrated example is provided. It is particularly preferred for the required site.

  Further, since the fit shape of the absorbent article varies depending on the body part of the wearer, the absorbent article is divided into a plurality of regions according to the body part of the wearer, and the continuous sheet joint portion in any one region It is also one preferred form that the direction is an oblique direction and the continuous direction of the sheet joining portion in any one other region is a different direction. For example, in the case of the above-mentioned pants-type disposable diaper, as shown in FIG. 12, in addition to dividing into a plurality of regions in the front-rear direction, dividing into a plurality of regions in the width direction as shown in FIG. You can make the direction different. More specifically, in the form shown in FIG. 12, the back body B is divided into two regions, a region of the waist edge portion W and a region from the waist lower portion U to the intermediate portion L, and the sheet joint portion 70 of each region is divided. The front body F is divided into three regions: a waist edge W region, an upper region of the waist lower portion U, and a region from the lower region of the waist lower portion to the middle portion L. Thus, the continuous direction of the sheet bonding portion 70 in each region is set to an oblique direction different from each other in order to improve the fit property. In the form shown in FIG. 13, the back body B is divided into a buttock central region and its side regions, and the continuous direction of the sheet joining portion 70 in the buttock central region is defined as the front-rear direction (vertical direction). The continuous direction of the sheet joint portion 70 is an oblique direction, and the front body F is divided into a region along the leg periphery and a buttock region (triangular region) inside the seat, and the sheet in the region along the leg periphery The continuous direction of the joint part 70 is defined as an oblique direction, and the continuous direction of the sheet joint part 70 in the buttock region is defined as the front-rear direction (longitudinal direction), thereby improving fit.

  In addition, when a desired fit cannot be obtained only by the pattern of the sheet joining portion 70, the technique described in JP 2012-29806 A is applied as necessary, and at least one side of the elastic stretchable member group is applied. It is also one preferable form that the positions of the end portions are appropriately arranged, for example, in an oblique direction as shown in FIG. 14 or in a curved shape as shown in FIG. In particular, when the end of the center in the width direction is formed by cutting an elastic elastic member, such as an elastic elastic member of a pants-type disposable diaper, the structure shown in the figure is manufactured by changing the cutting pattern. can do.

  On the other hand, since the sheet joining portion 70 is intermittent in the expansion / contraction direction in the above-described expansion / contraction structure, a decrease in the fixing force of the elastic expansion / contraction members 15 and 16 cannot be avoided, and the elastic expansion / contraction members 15 and 16 may come off. . In particular, it is desirable that the width 70w in the expansion / contraction direction of each sheet bonding portion 70 is narrow. In this case, the position where the elastic expansion / contraction members 15 and 16 and the sheet bonding portion 70 cross each other is small, and the elastic expansion / contraction member at this small position 15 and 16 need to be fixed, and it is important to secure the fixing force of the elastic members 15 and 16.

  Therefore, the elastic elastic members 15 and 16 are partially fixed to at least one of the first sheet material 12S and the second sheet material 12H even at a position other than the position where the sheet bonding portion 70 intersects, and the elastic elastic members 15 and 16 are fixed. It is also a preferred form. Specifically, as shown in FIG. 2, reinforcing hot-melt adhesive 71R is provided in a region where both ends of the elastic elastic members 15 and 16 are located in at least one of the first sheet material 12S and the second sheet material 12H. It is possible to reinforce the fixing of the elastic members 15 and 16 to the first sheet material 12S and the second sheet material 12H.

  In addition, since the elastic expansion members 15 and 16 of the exterior body 12 of the pants-type disposable diaper are firmly fixed at the side seal portion 12A at the end portions in the width direction, the end regions on the side seal portion 12A side are It is also a preferable form that the fixing strengthening means is omitted.

(Other)
The above example is an example of application to the part from the waist lower part U to the middle part L of the pants-type disposable diaper, but it may be applied including the waist edge W, and the elastic elastic member 16 of the middle part L May be omitted. Furthermore, stretching the structure described above, girth Ri portion and the dorsal portion of the tape type disposable diaper as described in the prior art section, the standing gathers and the like, can also be applied to other telescopic portion.

  In particular, in the above embodiment, the second sheet material has a surface in contact with the wearer's skin, but the first sheet material has a surface in contact with the wearer's skin (for example, in the above embodiment). The inside and outside of the first sheet material and the second sheet material may be reversed, and both the sheet materials 12S, 12H may have a surface that contacts the wearer's skin. However, since the adhesive 71 is continuous in the first sheet material 12S, not only the flexibility of the first sheet material 12S itself to be brought into contact with the skin but also the reduced portion of the flexibility is caused by the elastic elastic members 15 and 16 to the skin. This is not preferable in that respect. Therefore, it is desirable that the second sheet material 12H in which the adhesive 71 is not continuous is a member that contacts the skin of the wearer as in the above embodiment.

  The present invention is suitable for 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 all absorbent articles such as sanitary napkins.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior body, 12A ... Side seal part, 12H ... Second sheet material, 12S ... First sheet material, 12r ... Folded part, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... absorbing element, 56 ... absorber, 58 ... packaging sheet, 60 ... solid gather, 62 ... gather sheet, 70 ... sheet joint, 71 ... adhesive, 80 ... ８０, .theta. F ... Front body, B ... Back body.

Claims (3)

The first sheet material, the second sheet material facing one surface of the first sheet material, and the first sheet material and the second sheet material are provided along the expansion / contraction direction and spaced apart from each other. Provided with a plurality of elongated elastic stretch members,
The first sheet material and the second sheet material are arranged in an expanded state intermittently in the extending direction of the elastic elastic member, and an oblique direction in which the acute angle crossing angle with respect to the extending direction of the elastic elastic member is greater than 45 degrees Are joined by a continuous adhesive or welding process to form a sheet joint,
The sheet joint portion is a portion that continues in a curved shape across the plurality of elastic elastic members from one side to the other side,
The elastic elastic member is fixed to at least one of the first sheet material and the second sheet material at a position intersecting with the sheet joint portion,
The first sheet material and the second sheet material contract as the elastic elastic member contracts, so that the portions located between the sheet joint portions in the first sheet material and the second sheet material swell in opposite directions. Rutotomoni have folds are formed respectively, resilient and elastic members contraction state ing an oblique direction a and curved,
An elastic structure of an absorbent article characterized by the above.   The first sheet material and the second sheet material have a plurality of regions corresponding to the parts of the wearer's body, the continuous direction of the sheet joint portion in any one region is an oblique direction, and the other The stretchable structure of an absorbent article according to claim 1, wherein the continuous direction of the sheet joint portion in any one of the regions is different from this. The first sheet material, the second sheet material facing one surface of the first sheet material, and the first sheet material and the second sheet material are provided along the expansion / contraction direction and spaced apart from each other. Provided with a plurality of elongated elastic stretch members,
The first sheet material and the second sheet material are arranged in an expanded state intermittently in the extending direction of the elastic elastic member, and an oblique direction in which the acute angle crossing angle with respect to the extending direction of the elastic elastic member is greater than 45 degrees Are joined by a continuous adhesive or welding process to form a sheet joint,
The elastic elastic member is fixed to at least one of the first sheet material and the second sheet material at a position intersecting with the sheet joint portion,
The first sheet material and the second sheet material contract as the elastic elastic member contracts, so that the portions located between the sheet joint portions in the first sheet material and the second sheet material swell in opposite directions. Absorbent articles with stretchable structures, each having a ridge,
The absorbent article includes an exterior body constituting a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body, in both sides of the exterior body in the front body and in the back body by the side seal portion and both side portions of the outer body is joined, respectively, are formed, together with the girth Ri portion is formed in an annular shape, the waist opening and pair of leg openings formed, pants-type Disposable diapers,
The stretchable structure is provided in a region including at least both sides in the width direction of the interior body in the exterior body so that the elastic stretchable member is in the width direction,
The sheet joint portions are respectively provided on the left and right sides of the interior body in the front body so as to be obliquely left upward and obliquely upward when viewed from the outside of the absorbent article, respectively, and on the left side of the interior body in the back body And on the right side, respectively provided obliquely downward left and obliquely downward right as seen from the outside of the absorbent article,
An absorbent article characterized by the above .