JP6396144B2 - 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 obtained by attaching an elongated elastic stretchable member to a sheet in a stretched state, 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 the pants-type disposable diaper, in order to improve the fit to the body, elongated elastic elastic members such as rubber thread are fixed in a stretched state along the circumferential direction at various locations on the exterior body, Forming a stretchable structure, among them, a waist edge elastic elastic member along the width direction at the edge of the waist opening, and a waist lower part along the width direction at the crotch side than the waist edge elastic elastic member A thing provided with an elastic expansion-contraction member has a comparatively high fit with respect to a body, and is used widely.

  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, tape-type disposable diapers are inferior in fit in the waistline direction compared to pants-type disposable diapers, so in order to improve this, slender shapes such as rubber thread along the width direction on the back side and fastening tape These elastic elastic members are fixed in an extended state along the width direction to form an elastic structure in the trunk periphery direction.

  And as what improves these expansion-contraction structures, two sheet materials are intermittently bonded in the expansion / contraction direction and the vertical direction perpendicular thereto, thereby forming a large number of sheet bonding portions, and sheet bonding between the sheet materials A stretchable structure in which a plurality of elongated elastic stretchable members that are stretchable independently of both sheet materials are disposed so as not to pass through the portion (passing through the non-joined portion) (see Patent Documents 1 and 2 below, below) It is also called a directional intermittent joining mode.). According to this prior art, the portion where the sheet joints are aligned in the vertical direction becomes a groove that is continuous in the vertical direction, and the portion between the grooves becomes a large ridge that bulges on both sides of the front and back sides. In addition to improving, it has a superior feeling of warmth due to the wrinkles.

  Moreover, as what improves an external appearance, what covers the outer side of the fixing | fixed part of an elastic expansion-contraction member with a frill is proposed (patent document 4).

JP 2009-297096 A JP 2009-148447 A JP 2004-024304 A JP 2011-030791 A

  However, in the conventional stretchable structure, the number of sheets positioned on the skin side of the elastic stretchable member is almost one, and in such a form, tightening traces due to the elastic stretchable member are likely to occur on the skin, leading to blurring. There is a fear.

  In order to solve this, it is conceivable to increase the thickness of the layer located on the skin side of the elastic stretchable member by increasing the number of sheets located on the skin side of the elastic stretchable member. However, a decrease in air permeability is unavoidable, and since the attachment portion of the elastic elastic member directly touches the skin, the effect of preventing tightening marks is not so high.

  Then, the main subject of this invention is to make compatible prevention of the fall of air permeability and prevention of the clamping trace of an elongate elastic expansion-contraction member.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A sheet-like member made of a single breathable material and projecting to the opposite side of the skin contact side, and a cover part that overlaps the skin side of the heel in a state where the heel is lying down, between the opposing surfaces of each heel And an elongated elastic elastic member provided along the longitudinal direction of the heel,
The bag is formed by folding the breathable material,
The elastic elastic member is arranged so as to pass between the base portion and the tip portion of the heel, and at least both ends thereof are fixed between the opposing surfaces of the heel,
The wrinkles are fixed continuously or intermittently in the extending direction of the wrinkles so that the opposing surfaces of the root portions are not separated from each other,
Due to the contraction of the elastic elastic member, the collar and the cover part are contracted to form a collar, respectively.
An elastic structure of an absorbent article characterized by the above.

(Function and effect)
In the elastic structure of the present invention, not only the heel collapses by tightening due to the contraction of the elastic elastic member, but the skin side wall and cover portion of the lying heel are positioned on the skin side of the elastic elastic member. The thickness of the skin-side wall portion and cover portion of these wrinkles increases due to shrinkage wrinkles. That is, a thick portion having excellent cushioning properties is formed on the skin side of the elastic elastic member. In addition, since the thickness of the wall portion on the skin side of the heel increases on the base portion side and the tip portion side of the elastic expansion / contraction member due to the contraction folds, the tightening force of the elastic expansion / contraction member is distributed to the root portion side and the tip portion side of the heel. Even if the portion having the elastic elastic member is located on the skin side with respect to the root portion side and the tip portion side, concentration of the tightening force can be suppressed. As a result, the tightening traces of the elongated elastic elastic member are hardly attached to the skin. In addition, the thick portion is not a portion where the sheet-like members are in close contact with each other, and a large number of air gaps due to shrinkage wrinkles are formed. Therefore, in the stretchable structure of the present invention, it is possible to achieve both prevention of deterioration of air permeability and prevention of tightening traces of the elongated elastic stretchable member.
In addition, it is preferable to form the sheet-like portion with a single breathable material in this manner because the breathability is unlikely to decrease and the material cost can be reduced.

<Invention of Claim 2>
The elastic expansion and contraction member is arranged so as to pass through a position between the root portion and the tip portion of the heel and spaced from the root portion and the tip portion,
The ridges are non-joined between facing surfaces except at least the fixed part of the elastic elastic member on the tip side from the root part.
The elastic structure of the absorbent article according to claim 1.

(Function and effect)
By adopting such a structure, the shrinkage wrinkles of the wrinkles are formed larger, so that the above-described effects of the present invention are further enhanced.

<Invention of Claim 3>
In the sheet-like member, a large number of the ridges are arranged in parallel with each other, and the elastic elastic member is provided between the opposing surfaces of the ridges, and the cover portion includes at least a gap portion of the ridges. The elastic structure of the absorbent article according to claim 1.

(Function and effect)
When a large number of scissors are provided, since the contraction force of the elastic elastic members provided in the scissors on both sides of the scissors spacing acts, a firm scissors are formed by the scissors spacing. The effect of the present invention is further improved.

<Invention of Claim 4>
The absorption according to claim 3, wherein the large number of wrinkles are provided along the width direction in at least one of the front and rear regions of the absorbent article, and the wrinkles are lying in the same direction for each region having at least wrinkles. Stretchable structure for functional articles.

(Function and effect)
When a large number of scissors are arranged in parallel, if the slinging direction of the scissors is the same direction, not only the appearance becomes uniform, but also the manufacture becomes easy.

<Invention of Claim 5>
The stretchable structure of an absorbent article according to claim 3 or 4, wherein the protruding height of the ridges is longer than an interval between the ridges.

(Function and effect)
When a large number of ridges are provided, if the protrusion height of the ridges is made longer than the interval between the ridges, adjacent ridges overlap each other and the cover portion becomes thicker. It will be one more thing.

<Invention of Claim 6 >
The opposing surface of the heel is joined by a joint portion arranged intermittently in the stretching direction and continuing in a direction intersecting with the stretching direction, and at the portion of the joint portion, the heel is fixed in a lying state and The elastic structure of an absorbent article according to any one of claims 1 to 5 , wherein the elastic elastic member is fixed between opposing surfaces of the bag.

(Function and effect)
When such a joining form is adopted, contraction ridges extending along the expansion / contraction direction are intermittently formed in the expansion / contraction direction, and the air permeability and appearance are excellent.

<Invention of Claim 7 >
An absorptive article provided with the elastic structure of an absorptive article given in any 1 paragraph of Claims 1-6 .

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

<Invention of Claim 8 >
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 A pants-type disposable in which both sides of the exterior body are joined to each other to form a side seal portion, so that the waistline portion is formed in an annular shape, and a waist opening and a pair of left and right leg openings are formed. A diaper,
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 longitudinal direction of the heel is the width direction.
The absorbent article according to claim 7 .

(Function and effect)
The stretchable structure of the present invention is thus 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, according to the present invention, there are advantages such as being able to achieve both prevention of deterioration in air permeability and prevention of tightening traces of the elongated elastic elastic member.

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 the expansion | deployment state of a solid gather. It is a perspective view of a pants type disposable diaper. It is a perspective view which shows an expansion-contraction structure. It is a sample photograph. It is the schematic which shows the tightening reduction principle. It is sectional drawing of another form corresponding to 6-6 cross section of FIG. It is the schematic of a manufacturing principle. (A) Perspective view showing a telescopic structure, (b) A longitudinal sectional view of a part other than a joint part, and (c) a longitudinal sectional view of a part of the joint part. It is a perspective view which shows an expansion-contraction structure.

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 "In the state of wearing the diaper 100, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch part so that the both sides of the front body and the back body side of the diaper 100 overlap each other, 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 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 in a state of being. 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 extending in the front-rear direction is fixed to the free part in an extended state.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric excellent in uniformity and concealment, and water-repellent with silicone 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%. 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 fibers can be, for example, about 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.

  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. The shape is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.

  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.

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.

  The exterior body 12 includes a waist portion T defined as a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO, and a front-rear direction range of a portion forming the leg opening LO (a side seal portion 12A of the front body F). And an intermediate portion L defined as a front / rear direction region having the side seal portion 12A of the back body B. The waistline T can be divided into a “waist edge” W that conceptually forms the edge of the waist opening, and a “waist lower part” U that 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.

  The exterior body 12 shown in FIG. 3 to FIG. 6 is formed by attaching an elongated elastic elastic member 90 to a sheet material 12S, and is folded inward at the edge of the waist opening, and the folded portion 12r. Is extended so as to cover the upper end of the inner body 200.

  The sheet material 12S can be used without particular limitation as long as it is a breathable material, but is preferably a non-woven fabric. 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.

  In the exterior body 12, in order to improve the fit with respect to the circumference of the trunk, an elongated (thread-like, belt-like) elastic elastic member 90 (elastic elastic members 15 to 19) is attached to the sheet material 12 </ b> S. As the elastic elastic member 90, synthetic rubber or natural rubber may be used.

More specifically, a plurality of waist edge elastic elastic members 17 are vertically arranged between the folded portions 12r of the sheet material 12S at the waist edge W of the rear body B and the front body F so as to be continuous over the entire width direction. It is fixed at least at both ends in a state of being stretched along the width direction at a predetermined elongation rate with a gap in the 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 It is preferable to fix about 3 to 22 elastic stretch members of about 1.0 mm ² at intervals of 4 to 12 mm, and stretch rates of 150 to 400%, particularly about 220 to 320%, respectively. 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. .

  In addition, the waist lower portion U of the front body F and the back body B, except for the central portion in the width direction that overlaps with the interior body 200, is continuous with the entire width direction at each of the upper side and both sides in the width direction. A plurality of lower elastic elastic members 15 and 19 are fixed at least at both ends in a state where they are extended along the width direction at a predetermined extension rate with a space in the vertical 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 the resilient and elastic members of 1.0mm about ^2), 1 to 15 mm, particularly 5 to 30 present approximately at intervals of 3 to 8 mm, respectively elongation 200-350%, preferably fixed in particular about 240-300%.

  In addition, the middle part L of the front body F and the back body B has an elongated elastic shape so as to be continuous over the entire width direction at each part on both sides in the width direction except for the center part in the width direction overlapping the interior body 200. A plurality of intermediate elastic elastic members 16 and 18 made of an elastic member are fixed at least at both ends in a state where they are extended along the width direction at a predetermined extension rate with an interval in the vertical direction.

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 the resilient and elastic members of 1.0mm about ^2), 5 to 40 mm, in particular 2 to 10 present approximately at intervals of 5 to 20 mm, respectively elongation 150-300%, preferably fixed in particular 180 to 260%.

  As shown in the figure, when the waist lower elastic elastic members 15 and 19 and the intermediate elastic elastic members 16 and 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, and it does not look bad or absorbs. In this form, in addition to the form in which the elastic elastic members 15, 16, 18, and 19 exist only on both sides in the width direction, the elastic elastic members 15, 16, and 18 traverse the interior body 200 from one side in the width direction to the other side. , 19 exist, but the elastic elastic members 15, 16, 18, 19 are finely cut at the central portion in the width direction overlapping with the interior body 200, and the contraction force does not act (substantially, the elastic elastic member 15). , 16, 18 and 19) is also included in which only both sides in the width direction are configured as contraction force acting portions. The elastic elastic members 15, 16, 18, and 19 shown in FIG. 5 are those after being finely cut. Of course, the arrangement of the waist lower elastic members 15 and 19 and the middle elastic members 16 and 18 is not limited to the above example, and the waist lower elasticity so that the elastic force acts on the entire width of the waist lower U. Part or all of the elastic members 15 and 19 and the intermediate elastic elastic members 16 and 18 may be provided across the interior body 200 from one side in the width direction to the other side.

(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.

(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.

(Print sheet)
A print sheet 25 that is designed by printing is provided between the liquid-impermeable sheet 11 and the exterior body 12. The exterior body 12 may be omitted and the printing sheet 25 may be exposed on the outer surface. The printed sheet 25 in the illustrated example has a smaller area than the body on which the printed sheet 25 is disposed, and is provided separately for the front body F and the back body B, but passes through the crotch from the front body F. It can also be provided so as to continue to the back body B integrally.

  Although the size and shape of the printing sheet 25 are not particularly limited, it is preferable to sufficiently increase the area in order to make the function sufficient. For example, the width of the printing sheet 25 is 50 to 120 of the width of the absorber 56. The length of the printing sheet 25 is preferably about 15 to 30% of the total length Y of the article on at least one side of the stomach side and the back side. Further, the shape of the print sheet 25 is preferably a rectangle as shown in the figure in that trim loss does not occur. However, the print sheet 25 has a geometric shape such as a circle, an ellipse, a triangle, a hexagon, or a shape along the periphery of the design. You may cut it.

As the sheet base material of the printing sheet 25, a plastic film, non-woven fabric, paper, or the like can be used, but a bulky material having high air permeability is preferable. When using a plastic film, it is desirable to have moisture permeability in order to prevent stuffiness. Nonwoven fabrics and paper are preferable because they have moisture permeability, and when performing design printing, it is preferable to use nonwoven fabrics that are smooth and easy to print, and papers that are high in strength and difficult to bleed ink. Particularly preferred are basis weight 15 to 35 g / m ² approximately, crepe paper having a thickness of about 0.1 to 0.3 mm (thin paper) and a basis weight 10 to 25 g / m ² approximately, a thickness of about 0.1 to 0.3 mm Non-woven fabrics (especially spunbond nonwoven fabrics and SMS nonwoven fabrics having a spunbond portion having a fineness of about 1.0 to 3.0 dtex). When crepe paper is used, the crepe rate is preferably about 5 to 20%, particularly about 5 to 15%. If the crepe rate is 20% or more, the amount of ink fixed increases, but blurring occurs and is not suitable for design printing. If the crepe rate is 5% or less, the amount of fixing is small because the ink hardly penetrates.

(About stretchable structure)
In the present pants-type disposable diaper, the stretchable structure of the present invention is adopted in the region from the lower waist portion U to the middle portion L. That is, as shown in FIGS. 6 and 9, the portion includes a sheet having a ridge 80 that protrudes on the side opposite to the skin contact side, and a cover portion 85 that overlaps the skin side of the ridge 80 in a state where the ridge 80 is lying down. The elongated elastic elastic member 90 (the elastic elastic members 15, 16, 18, and 19 described above) provided along the longitudinal direction of the flange 80 between the opposing surfaces 80a and 80b of the flange 80, respectively. have. A large number of ridges 80 are arranged in parallel in the vertical direction, and elastic elastic members 90 are provided between the opposing surfaces 80a and 80b of each ridge 80, and the cover portion 85 is formed at least from the interval portion of the ridge 80. Has been. The elastic elastic member 90 is disposed so as to pass between the root portion 81 and the tip portion 82 of the flange 80, and at least both ends thereof are fixed between the opposing surfaces 80a and 80b of the flange 80. Further, the flange 80 is fixed continuously or intermittently in the extending direction of the flange 80 so that the opposing surfaces 80a and 80b of the root portion 81 are not separated (the mouth is not opened). And, by the contraction of the elastic expansion / contraction member 90, the collar 80 and the cover portion 85 are contracted, and the collar is formed.

  FIG. 10 is a photograph of the main part of the prototype (the same structure as the embodiment) attached to the dummy doll, showing the state of the heel in the attached state and the passing position of the elastic elastic member 90. FIG. 11A schematically shows a cross-section of the mounting state, and FIG. 11B shows a mounting state of a conventional product in which the elastic elastic member 90 is simply sandwiched between two sheet-like members 12S. The line shown by the symbol SK in the figure assumes the wearer's skin surface. As can be seen from these examples, in the stretchable structure of the present invention, the heel 80 is laid down by tightening due to the contraction of the elastic stretchable member 90, and the skin side wall of the fallen fold 80 is placed on the skin side of the elastic stretchable member 90. Not only the portion 80W and the cover portion 85 are positioned, but also the wall side 80W and the cover portion 85 on the skin side of these ridges 80 are each increased in thickness by contraction folds. In particular, since the contraction force of the elastic elastic members 90 provided in the flanges 80 on both sides acts also on the interval portions of the flanges 80 forming the cover portion 85, a firm flange is also formed on the interval portions of the flanges 80. It is formed. And compared with the conventional product of FIG.11 (b), the thick part FP excellent in cushioning properties is formed in the skin side of the elastic elastic member 90. FIG. Further, since the wall portion 80W on the skin side of the heel 80 increases in thickness on the base portion 81 side and the distal end portion 82 side of the elastic expansion / contraction member 90 due to contraction folds, the tightening force of the elastic expansion / contraction member 90 causes the root portion 81 of the heel 80 to tighten. Even if the site | part which has the elastic expansion-contraction member 90 disperse | distributed to the side and the front-end | tip part 82 side is located in the skin side rather than the base part 81 side and the front-end | tip part 82 side, concentration of clamping force can be suppressed. As a result, the tightening trace of the elongated elastic elastic member 90 is difficult to adhere to the skin. In addition, the thick portion FP is not a portion where the sheet-like members 12S are in close contact with each other, and a large number of ventilation gaps due to the shrinkage wrinkles are formed. Therefore, in the stretchable structure of the present invention, it is possible to achieve both prevention of deterioration in air permeability and prevention of tightening traces of the elongated elastic stretchable member 90.

  The passing position of the elastic expansion / contraction member 90 in the ridge 80 may be between the root portion 81 and the tip portion 82 of the ridge 80, but preferably to some extent with respect to the root portion 81 and the tip portion 82 as shown in the drawing. It is preferable to set the position at a distance, particularly a position where the distance 81d from the base end of the flange 80 is about 1 to 10 mm and the distance 82d from the tip of the flange 80 is about 1 to 10 mm. Further, it is preferable that the flange 80 is not joined between the opposing surfaces 80a and 80b on the tip side of the root portion 81 except at least the fixing portion of the elastic elastic member 90. By adopting at least one of these structures, the shrinkage wrinkles of the wrinkles 80 are formed larger, so that the above-described effects of the present invention are further enhanced. Although the number of the elastic elastic members 90 in one ridge 80 is desirably one, a plurality of elastic members 90 can be provided at intervals. However, even when a plurality of elastic elastic members 90 are provided, the passing position in the flange 80 is within the above-described range.

  The elastic expansion / contraction member 90 only needs to be fixed to the sheet-like member 12S at least at both end portions (in the illustrated embodiment, the end portion on the side seal portion 12A side and the end portion on the center side in the width direction). As shown in FIG. 9, it may be intermittently fixed in the longitudinal direction or may be continuously fixed in the longitudinal direction as shown in FIG. This fixing means is indicated by reference numeral 83 in the figure. As a means for fixing the elastic elastic member 90, a hot melt adhesive can be suitably used. In this case, the hot melt adhesive is applied to the outer peripheral surface of the elastic elastic member 90 to face the opposing surface 80 a of the heel 80. , 80b, the opposing surfaces 80a, 80b can be non-joined except for the fixing portion of the elastic elastic member 90 on the tip side of the base portion 81 of the flange 80. Utilizing the weldability of at least one of the elastic stretch member 90 and the sheet-like member 12S, the elastic stretch member 90 is integrally welded from the outside of the flange 80 in a state where the elastic stretch member 90 is sandwiched between the opposing surfaces 80a and 80b of the flange 80. Thereby, the elastic elastic member 90 can also be fixed to the sheet-like member 12S. Alternatively, the opposing surfaces 80a and 80b of the flange 80 can be welded on both sides of the elastic elastic member 90 and fixed by the frictional force of the elastic elastic member 90 (see Japanese Patent Application Laid-Open No. 2008-154998). Further, the end of the elastic elastic member 90 on the side seal portion 12A side can be fixed using the fixing force of the side seal portion 12A.

The fixing means for the elastic elastic member 90 can be made different depending on the portion of the elastic elastic member 90. For example, since it is necessary to firmly fix both ends of the elastic elastic member 90, fixing by hot melt adhesive, fixing by welding (including fixing by the side seal portion 12A), or a combination of both. Can be used. On the other hand, if the intermediate portion between these is not fixed , it is preferable because the flexibility is high. However, since the position of the elastic expansion / contraction member 90 is not stable if it is simply not fixed, the opposing surfaces 80a and 80b of the flange 80 on both sides of the elastic expansion / contraction member 90 are formed on the elastic expansion / contraction member 90 as shown in FIG. It is possible to form a joint portion 80c by joining intermittently (or continuously) in the longitudinal direction by hot melt adhesive or welding, and to form a guide for regulating the passage position of the elastic elastic member 90 by this joint portion 80c. desirable.

  The collar 80 is fixed so that the opposing surfaces 80a and 80b of the root portion 81 are not separated. This fixing means is indicated by reference numeral 84 in the figure. As shown in FIG. 9 (a), this fixing has an advantage that the reduction in flexibility is small if it is intermittent in the extending direction of the flange 80, and is continuous as shown in FIG. 9 (b). If it exists, there exists an advantage that there is little possibility that the welding part inside the heel 80 and the elastic elastic member 90 may contact skin. In addition to joining the opposing surfaces 80a and 80b to each other, this fixing may also be performed by joining another sheet-like member 12S straddling the collar 80 to the surface opposite to the protruding side of the collar 80 as shown in FIG. it can. In the illustrated embodiment, a hot melt adhesive (dotted pattern portion in the figure) is assumed as a joining means, but the adhesive strength and durability are inferior to those of welding, and when the adhesive peels off, the hot melt adhesive is used. Since there exists a possibility of contacting with skin, the welding process is more preferable. The fixing width (length in the protruding direction of the ridge) 81w of the root portion 81 may be determined as appropriate, but when it is about 1 to 5 mm, the fixing can be surely performed and the contraction ridge of the ridge 80 is formed larger. Thus, the above-described effects of the present invention are further enhanced.

  The protruding height 80h of the ridge 80 (the height when the ridge is folded flat, which is equal to the width of the cover portion 85) can be determined as appropriate, but in the normal case, it is preferably about 2 to 20 mm. Moreover, although the space | interval 80d between the ridges 80 when many ridges 80 are arranged in parallel can also be determined suitably, it is desirable to set it as about 2-30 mm in normal cases. When the protruding height 80h of the flange 80 is the same as or shorter than the interval 80d between the flanges 80, the cover 85 has a configuration consisting only of the portion between the flanges 80, whereas the protruding height 80h of the flange 80 is 80mm. If it is longer than the interval 80d, the adjacent ridges 80 overlap each other, and the cover portion 85 becomes thicker, so that the effect of the present invention is further enhanced.

  In the case where a large number of ridges 80 are provided in the width direction in at least one of the front and rear regions of the diaper as in the present embodiment, the ridges 80 fall in the same direction for each region having at least the ridges 80. It is preferable not only because the appearance is uniform, but also because the manufacturing is easy. As shown in the figure, the lying direction of the heel 80 in the front area and the lying direction of the heel 80 in the rear area are set opposite to each other. It is also possible to have the same orientation (front or back). However, when garments such as trousers, spats, leggings, and tights are mounted on the pants-type disposable diaper, the base portion 81 of the heel 80 is on the waist side as shown in the figure because of the low resistance when taking off the garments. It is preferable that the tip portion 82 is laid down so as to be on the crotch side. In addition, since the collar 80 of the present embodiment extends to the side seal portion 12A, the collar 80 is also fixed in a lying state when the side seal portion 12A is fixed.

  As one preferred embodiment, the opposing surfaces 80a and 80b of the ridge 80 are joined by joint portions 70 that are intermittently arranged in the expansion / contraction direction and are continuous in the direction crossing the expansion / contraction direction, as shown in FIG. When the flange 80 is fixed in a lying state and the elastic elastic member 90 is fixed between the opposing surfaces 80a and 80b of the flange 80, the contraction flange extending along the expansion / contraction direction is expanded / contracted. It is preferable because it is formed intermittently and has excellent breathability and appearance. As a means 71 for joining the opposing surfaces 80a and 80b of the heel 80, fixing the heel 80 in a lying state, and fixing the elastic elastic member 90, in addition to a hot melt adhesive (form shown in FIG. 14), A welding process such as heat sealing or ultrasonic sealing can be used. The joining between the facing surfaces 80a and 80b of the heel 80, the fixing of the heel 80 in the lying down state, and the fixing of the elastic elastic member 90 can be performed simultaneously by one means, or separately by one or a plurality of means. Can also be processed. Further, the joining between the facing surfaces 80a and 80b of the flange 80 can also serve as fixing of the facing surfaces 80a and 80b of the root portion 81 described above.

  The shape of the joint portion 70 of the facing surfaces 80a and 80b of the ridge 80 can be determined as appropriate, but the illustrated form that is linearly continuous with a predetermined width in the direction intersecting (orthogonal in the illustrated form) with the expansion and contraction direction is one preferable. It is a form. The width 70w in the expansion / contraction direction of each joint 70 can be determined as appropriate, but is preferably about 1 to 4 mm (particularly 1 to 2 mm). Further, the interval 70d between adjacent joints 70 can be determined as appropriate, but is preferably about 4 to 8 mm (particularly 5 to 7 mm). By setting it within this range, it is possible to achieve both a sufficient soft feeling and prevention of irregular crushing of the ridge 80 due to compression during packaging.

  On the other hand, as described above, in the case where the expansion / contraction is killed by finely cutting the elastic expansion / contraction member 90 in a part or all of the region overlapping the interior body 200 in the pants-type disposable diaper, as shown in FIG. If the elastic stretchable member 90 is cut together with the breathable material 120 from the outside of the heel 80, a cut 88 is formed in the heel 80, and since this cut 88 is formed in the heel 80, it is easy to open, and the appearance and the touch may be deteriorated. is there. Therefore, as shown in FIG. 15B, it is desirable that the elastic stretchable member 90 in the collar 80 is finely cut, but the breathable material 120 forming the collar 80 is not cut. Such cutting of the elastic stretchable member 90 can be performed by applying pressure / heating processing such as heat sealing or ultrasonic sealing to the elastic stretchable member 90 together with the breathable material 120 from the outside of the ridge 80. In this case, although the welding trace 89 of the breathable material 120 remains at the cutting position of the elastic elastic member 90 on the outer surface of the ridge 80, the cut and holes are not opened, and the internal elastic elastic member 90 is cut. It should be noted that the opposing surfaces 80a and 80b of the flange 80 may or may not be joined by this pressurization / heating process.

(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. Moreover, the above-mentioned expansion-contraction structure is applicable also to other expansion-contraction parts, such as the trunk | drum circumference part of the back side part of a tape type disposable diaper described in the term of the prior art, and a three-dimensional gather.

In the stretchable structure of the present invention, a plurality of sheet-like members 12S can be used as in the example shown in FIG . The sheet-like member 12S having the ridge 80 is made of a single breathable material, and the ridge 80 is formed by folding the breathable material. The ridge 80 has the opposite surfaces 80a and 80b of the root portion 81 having the ridge 80. It is preferable to continuously or intermittently join in the extending direction because air permeability is unlikely to decrease and material costs can be reduced.

The manufacturing method of the stretchable structure in the case where the sheet-like member is constituted by a single breathable material in this way is not particularly limited. For example, a single breathable material is folded and fixed by a sailor and the elastic stretchable member is sandwiched therebetween. Although the method (used when manufacturing the three-dimensional gather 60) may be applied, for example, the method shown in FIG. 13 may be employed. That is, in this stretchable structure forming method, as shown in FIG. 13 (a), while a sheet of breathable material 120 is conveyed in a flat state by a flat conveying surface 100 of the production line, The base part adhesive 121 for bonding the opposing surfaces 80a and 80b of the base part 81 of the ridge 80 is applied. At this time, when a large number of ridges 80 are formed as in the above-described embodiment, the root adhesive 121 is applied by that number. Preferably, the intermediate adhesive 122 is applied to the fixing position of the elastic elastic member 90. The application position of the intermediate adhesive 122 is not only the position that is one of the opposing surfaces 80a and 80b of the ridge 80 as shown in the figure, but can also be applied to the positions that are both surfaces. it can. Further, the application of the intermediate part adhesive 122 can be performed before or after the application of the root part adhesive 121 simultaneously.
Next, as shown in FIGS. 13B and 13C, V-shaped grooves 101 extending in the transport direction (direction perpendicular to the plane in the drawing) are spaced apart in the CD direction (lateral direction perpendicular to the transport direction). While being conveyed by the formed conveyance surface 100, suction is performed as indicated by an arrow from the inner surface of the V-shaped groove 101. The state of FIG. 13C shows the downstream side of the state of FIG. 13B, and as can be seen from this relationship, the center interval of the V-shaped groove 101 is continuous toward the downstream side in the transport direction. And the inclination angle of both side surfaces is continuously increased. Therefore, the air-permeable material 120 on the conveying surface 100 is deformed so as to follow the V-shaped groove by suction, and the portion located in the V-shaped groove 101 is increased with the inclination angle of both side surfaces of the V-shaped groove 101. It will be folded.
In order to smoothly fold the breathable material 120 in the V-shaped groove 101, as shown in FIGS. 13B and 13C, it is more preferable that at least one of the V-shaped grooves 101 (the illustrated example is only one). The presser plate 102 is disposed on the shoulder portion of both of them. Further, as indicated by an arrow in FIG. 13C, air may be blown from the holding plate 102 toward the side surface of at least one of the V-shaped grooves 101 (the illustrated example is only one, but both may be used). it can.
Next, as shown in FIG. 13 (d), an elastic elastic member 90 is introduced along the conveying direction between the opposed inner surfaces of the V-shaped breathable material 120 folded to a certain extent. Hold in position. In the case where the intermediate adhesive 122 is not applied, or in order to secure a stronger adhesive force, the hot melt adhesive 91 is previously applied to the outer peripheral surface of the elastic expansion / contraction member 90 by a sure wrap nozzle, a comb gun or the like as shown in the figure. It may be applied.
Thereafter, as shown in FIG. 13E, the inclination angle of both side surfaces of the V-shaped groove 101 of the conveying surface 100 is further increased, so that the portion located in the V-shaped groove 101 is completely folded. In addition, when there is an adhesive applied to the outer peripheral surface of the intermediate part adhesive 122 or the elastic expansion / contraction member 90 by the root part 81 adhesive, the opposite side surface of the breathable material 120 is also bonded by this adhesive. The elastic elastic member 90 is fixed to the breathable material 120. Thus, a large number of eaves 80 can be formed continuously and simultaneously.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
The “front / rear (vertical) direction” means a direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means a direction (left / right direction) orthogonal to the front / rear direction.
“Elongation rate” means a value when the natural length is 100%.
・ "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, 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 amount of water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resin".
・ The water absorption rate is the “time to end point” when JIS K7224-1996 “Water absorption rate test method for superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .

  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, 12S ... Sheet-like member, 12r ... Folded part, 25 ... Print sheet, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Solid gather, 62 ... Gather sheet, 70 ... Post-treatment tape, 80 ... Saddle, 200 ... Interior body, 80a, 80b ... Opposing surface, 85 ... Cover part, 90 ... Elasticity Expandable member, 81 ... root part, 82 ... tip part, 100 ... conveying surface, 101 ... V-shaped groove, 102 ... presser plate, 120 ... breathable material, 121 ... root part adhesive, 122 ... intermediate part adhesive.

Claims (8)

A sheet-like member made of a single breathable material and projecting to the opposite side of the skin contact side, and a cover part that overlaps the skin side of the heel in a state where the heel is lying down, between the opposing surfaces of each heel And an elongated elastic elastic member provided along the longitudinal direction of the heel,
The bag is formed by folding the breathable material,
The elastic elastic member is arranged so as to pass between the base portion and the tip portion of the heel, and at least both ends thereof are fixed between the opposing surfaces of the heel,
The wrinkles are fixed continuously or intermittently in the extending direction of the wrinkles so that the opposing surfaces of the root portions are not separated from each other,
Due to the contraction of the elastic elastic member, the collar and the cover part are contracted to form a collar, respectively.
An elastic structure of an absorbent article characterized by the above. The elastic expansion and contraction member is arranged so as to pass through a position between the root portion and the tip portion of the heel and spaced from the root portion and the tip portion,
The ridges are non-joined between facing surfaces except at least the fixed part of the elastic elastic member on the tip side from the root part.
The elastic structure of the absorbent article according to claim 1.   In the sheet-like member, a large number of the ridges are arranged in parallel with each other, and the elastic elastic member is provided between the opposing surfaces of the ridges, and the cover portion includes at least a gap portion of the ridges. The elastic structure of the absorbent article according to claim 1.   The absorption according to claim 3, wherein the large number of wrinkles are provided along the width direction in at least one of the front and rear regions of the absorbent article, and the wrinkles are lying in the same direction for each region having at least wrinkles. Stretchable structure for functional articles.   The stretchable structure of an absorbent article according to claim 3 or 4, wherein the protruding height of the ridges is longer than an interval between the ridges. The opposing surface of the heel is joined by a joint portion arranged intermittently in the stretching direction and continuing in a direction intersecting with the stretching direction, and at the portion of the joint portion, the heel is fixed in a lying state and The elastic structure of an absorbent article according to any one of claims 1 to 5 , wherein the elastic elastic member is fixed between opposing surfaces of the bag. An absorptive article provided with the elastic structure of an absorptive article given in any 1 paragraph of Claims 1-6 . 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 A pants-type disposable in which both sides of the exterior body are joined to each other to form a side seal portion, so that the waistline portion is formed in an annular shape, and a waist opening and a pair of left and right leg openings are formed. A diaper,
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 longitudinal direction of the heel is the width direction.
The absorbent article according to claim 7 .