JP2016021989A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a leakage prevention effect from front and rear end parts of a solid gather.SOLUTION: An absorbent article comprises a body part 201 and solid gathers 60. The body part 201 is a portion having a liquid permeable top sheet 30, a rear side liquid impermeable sheet 11, and an absorber 56 interposed between these sheets. The solid gather 60 comprises: an attachment portion 65 fixed on the rear side from the absorber 56 in the body part 201 and at a portion away from the side edge of the body part 201 to a width direction central side; an extension portion 66 extending sideways from the attachment portion 65 and folded back one or multiple times; a folded fixed portion 67 formed by fixing both longitudinal end parts of the extension part 66, among both longitudinal end parts and a longitudinal intermediate part of the extention portions 66, sideways from the attachment portion 65 in the body part 201 in a state of folding both longitudinal end parts; a free portion 68 formed in a state in which the longitudinal intermediate part is not fixed to the body part 201; and a gather elastic stretchable member 63 fixed in at least the tip part of the free portion 68 along the longitudinal direction in a stretched state.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an absorbent article having a three-dimensional gather.

  Absorbent articles such as pants-type, tape-type, pad-type disposable diapers, sanitary napkins, etc. have a basic structure with an absorbent body interposed between a liquid-permeable top sheet and a liquid-impermeable sheet In order to improve the fit around the legs and prevent so-called side leakage, it is common that the three-dimensional gathers protruding on the body side extend along the front-rear direction on both sides in the width direction of the surface (For example, see Patent Documents 1 to 3).

  And although the thing of various structures is proposed as a three-dimensional gather, now, the extension part extended from the attachment part to the front side of an absorbent article is fixed to the side part of an absorbent article. Of the extension part, the front-rear direction end part and the front-rear direction intermediate part of the extension part, the front-rear direction end part being in a lying state and being fixed to the surface of both side parts of the top sheet, and the front-rear direction intermediate part Generally, a structure has a free part that is not fixed and a gather elastic elastic member that is fixed in an extended state along the front-rear direction to at least the tip of the free part. The three-dimensional gather is generally formed of a water-repellent nonwoven fabric in order to impart water shielding properties, and it has also been proposed that a water shielding film is incorporated.

  However, in the conventional absorbent article, since the lodging portion before and after the three-dimensional gather is fixed to the surface of the top sheet, if excrement flows into this part, it is not obstructed by the three-dimensional gather, and the top sheet However, since it was covered with the water-proof three-dimensional gather, there was a problem that it leaked out without being absorbed through the top sheet.

JP 2006-43326 A JP 2004-65301 A JP 2013-252463 A

  Therefore, the main problem of the present invention is to improve the effect of preventing leakage from the front and rear ends of the three-dimensional gather.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A liquid-permeable top sheet, a back-side liquid-impermeable sheet, and a main body part that is a part having an absorbent body interposed therebetween,
In an absorbent article provided with a three-dimensional gather provided on both sides of the main body,
The three-dimensional gather is
An attachment portion fixed to an attachment portion on the back side of the absorber in the main body portion and spaced from the side edge of the main body portion toward the center in the width direction, and the front side extending from the attachment portion to the side Of the extension part, and both the front and rear direction end parts and the front and rear direction intermediate part of the extension part, the side edges and the attachment in the main body part are folded A folding and fixing portion that is fixed between the body portion, a free portion that is formed such that an intermediate portion in the front-rear direction is not fixed to the main body portion, and at least a front end portion of the free portion in the front-rear direction A gather elastic elastic member fixed in an extended state along,
An absorbent article characterized by the above.

(Function and effect)
In the three-dimensional gather according to the present invention, the folding fixing portions positioned at the front and rear end portions are fixed to the back side of the absorbent body in the main body portion, so that both side surfaces of the main body portion can absorb excrement throughout the entire front and rear. Therefore, it is possible to prevent leakage of excrement caused by the overlaid portions of the front and rear ends of the three-dimensional gather, which is inevitable with the conventional three-dimensional gather. In addition, even if the folding fixed part is fixed to the back side of the absorber in the main body part, the free part is not fixed to the main body part, so it can be raised to the body side via the side of the main body part, The contraction force of the gather elastic elastic member acts to bring the front and rear folding fixing parts closer, and the free part comes into elastic contact with the body in a standing state. Therefore, the same leakage prevention function as that of a conventional three-dimensional gather can be exhibited.

<Invention of Claim 2>
2. The absorbent article according to claim 1, wherein the extending portion is even-folded, and at least a distal end portion of the free portion protrudes laterally from a side edge of the main body portion.

(Function and effect)
As described above, the number of foldings of the extending part is set to an even number of times, the tip part is directed to the side, and the tip part protrudes to the side from the side edge of the main body part. Due to the contraction force of the expansion / contraction member, it naturally rises to the body side via the side of the main body.

<Invention of Claim 3>
The absorbent article according to claim 2, wherein the entire front-rear direction of the extending portion protrudes from a side edge of the main body portion and is not fixed to the main body portion.

(Function and effect)
In this way, even the front and rear end portions of the extending portion are protruded from the side edge of the main body portion, and the protruding portion is not fixed to the main body portion, so that only the distal end portion is in the folding fixing portion of the extending portion. Will stand to the side of the main body. That is, it has a rising portion extending over the entire front-rear direction, and the leakage prevention performance at the front and rear ends of the three-dimensional gather is further improved.

<Invention of Claim 4>
Whether the main body has a width in which the top sheet extends around the side of the absorber and extends to the back side of the absorber, and the liquid-impermeable sheet fits on the back side of the absorber. Alternatively, the absorbent article according to any one of claims 1 to 3, wherein the absorbent article extends around a side of the absorbent body and extends to a front side of the absorbent body.

(Function and effect)
Since the three-dimensional gather of the present invention is attached to the back side of the absorbent body of the main body and rises around the side of the absorbent body, the absorbent article having such a structure of the main body (pants-type disposable diaper) It is suitable for interior bodies, pad-type disposable diapers, sanitary napkins, etc.).

<Invention of Claim 5>
A waist opening for passing the wearer's torso and a pair of left and right leg openings for allowing the legs to pass through, where both sides of the outer body that forms the front body and both sides of the exterior body that forms the back body are joined in advance or in use. The absorbent article according to any one of claims 1 to 4, wherein each of the absorbent articles is a disposable diaper in which an interior body that forms the main body is attached to the inside of the exterior body.

(Function and effect)
In a pants-type disposable diaper or the like, such a structure composed of an exterior body and an interior body is widely used, and the three-dimensional gather of the present invention is particularly suitable for being added to the interior body.

  As described above, according to the present invention, advantages such as an improvement in the effect of preventing leakage from the front and rear ends of the three-dimensional gather are brought about.

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. It is a top view in the state where the diaper was developed showing only the principal part of a pants type disposable diaper. 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. FIG. 3 is a cross-sectional view corresponding to a 3-3 cross section of FIG. 1. FIG. 4 is a cross-sectional view corresponding to a 4-4 cross section of FIG. 1. It is the perspective view seen from the direction shown by the dashed-dotted arrow 6 of FIG. It is a photograph of an experimental result.

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

  The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior body 12 is a part that supports the interior body 200 with respect to the wearer's body. In addition, the dot pattern portion in the cross-sectional view shows an adhesive as a joining means for joining the constituent members, and by applying solid, bead, curtain, summit, spiral, etc., such as hot melt adhesive, and the elastic elastic member The fixed portion is formed by coating on the outer peripheral surface of an elastic expansion / contraction member such as a comb gun or a shroud coating instead of or together with this. As the joining means for joining the constituent members, welding means such as heat sealing and ultrasonic sealing can be used.

(Exterior body)
The exterior body 12 has a portion constituting a front body F extending from the center in the front-rear direction to the ventral side and a portion constituting a rear body B extending from the center in the front-rear direction to the back side. The side seal portion 12A is formed by joining both sides of the back body B and both sides of the back body B, and as shown in FIG. 8, the waist opening WO for passing the wearer's torso and the left and right for passing the legs A pair of leg openings LO are formed.

  The exterior body 12 includes a waist portion T defined as a longitudinal range (a longitudinal range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a longitudinal range ( An intermediate portion L defined by a vertical region having the side seal portion 12A of the front body F and a vertical region having the side seal portion 12A of the rear body B. The waistline portion T can be divided into a “waist edge portion” W that conceptually forms an edge portion of the waist opening and a “waist lower portion” U that is a lower portion than this. Usually, when there is a boundary (for example, the thickness or elongation rate of the elastic elastic member changes) in the waistline portion T, the waist opening WO side is closer to the waist edge than the waist opening WO side boundary. When there is no such boundary, the waist opening WO side becomes the waist edge W with respect to the absorbent body 56 or the interior body 200. 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 5, the exterior body 12 is formed by bonding two sheet materials 12 </ b> S and 12 </ b> H with an adhesive such as a hot-melt adhesive, and is an inner sheet material positioned on the inner side. 12H extends only to the edge of the waist opening WO, but the outer sheet material 12S wraps around the edge on the waist side of the inner sheet material 12H and is folded inside thereof, and the folded portion 12r is the inner body 200. 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. When using a non-woven fabric, the basis weight is preferably about 10 to 30 g / m ² (about 20 to 60 g / m ² as the entire outer package).

  And in the exterior body 12, in order to improve the fitting property with respect to the trunk periphery, elongated elastic elastic members 15 to 19 such as thread rubber are provided at a predetermined elongation rate between the sheet materials 12S and 12H. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the two sheet materials 12S and 12H of the outer package 12 and fixing the elongated elastic elastic members 15 to 19 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic bonding by various application methods may be used. it can. If the entire exterior body 12 is firmly fixed, the texture of the sheet is impaired, which is not preferable. By combining these, it is preferable that the elongated elastic elastic members 15 to 19 are firmly bonded, and other portions are not bonded or bonded weakly.

More specifically, between the inner side surface of the inner sheet material 12H and the outer surface of the folded portion 12r of the outer sheet material 12S at the waist edge W of the rear body B and the front body F, the entire width direction is continuous. In addition, the plurality of waist edge elastic elastic members 17 are fixed in a state of being stretched along the width direction at a predetermined elongation rate with a space in the front-rear direction. In addition, one or a plurality of the waist edge elastic elastic members 17 disposed in the region adjacent to the waist lower part U may overlap with the interior body 200 or may overlap with the interior body 200. You may each provide in the width direction both sides except a direction center part. The waist edge elastic elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. Further, the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .

  Further, between the outer side surface of the inner sheet material 12H and the inner side surface of the outer sheet material 12S in the lower waist portion U of the front body F and the rear body B, except for the central portion in the width direction overlapping the interior body 200, A plurality of waist lower elastic elastic members 15 and 19 made of an elongated elastic elastic member, which are continuous in the entire width direction at each of the upper and both sides in the width direction, are spaced apart in the front-rear direction, and have a predetermined length. It is fixed in an expanded state along the width direction at an expansion rate.

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. the rubber thread ~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%.

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

The intermediate elastic elastic members 16 and 18 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

  In addition, as shown in the drawing, the waist lower elastic member 15 and the intermediate elastic members 15, 19, 16, 18 are provided on both sides in the width direction except for the center portion in the width direction overlapping the interior body 200. Then, the interior body 200 does not shrink more than necessary in the width direction, and it does not look bad and absorbability does not deteriorate. 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 member 15 and the intermediate elastic members 15, 19, 16, 18 is not limited to the above example, so that the elastic force acts on the entire width direction of the waist lower U. A part or all of the waist lower elastic member 15 and the intermediate elastic members 15, 19, 16, 18 may be provided across the interior body 200 from one side to the other side in the width direction.

(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 through 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)
Between the liquid-impermeable sheet 11 and the exterior body 12 (including the layers of the exterior body 12), a printed sheet 25 that is designed by printing can be provided. The print 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 a sheet material of the printing sheet 25, a plastic film, a nonwoven 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.

(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. However, the exterior body and the back side exterior body covering the stomach side of the wearer's torso and the back And the front end portion of the interior body is connected to the inner surface of the central portion in the width direction of the ventral side exterior body by a hot melt adhesive or the like, and the center in the width direction of the back side exterior body. The rear end part of the interior body is connected to the inner surface of the interior part by a hot melt adhesive or the like, and the abdominal side exterior body and the back side exterior body are not continuous on the crotch side, and a form in which they are separated is also adopted. Can do. This separation distance can be about 150 to 250 mm. In this case, on the back surface of the liquid-impermeable sheet in the interior body, the crotch is formed so as to cover the entire back surface of the interior body or to cover the entire portion exposed between the abdominal exterior body and the back exterior body. The exterior body can also be fixed. As the crotch outer casing, the same materials as those used for the outer casing described above can be used. The crotch outer body also corresponds to the outer body of the present invention.

(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. Is a three-dimensional gather 60 that stands on the body side and is provided on both sides of the interior body 200 over the entire front and rear direction (or part of it) to prevent excrement from leaking to both sides of the interior body 200. ing. In this embodiment, a portion other than the three-dimensional gather 60 of the interior body 200 is the main body portion 201.

(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, it is preferable that both side portions of the topsheet 30 extend around the side of the absorbent element 50 to the back side thereof. Moreover, in this case, in order to prevent the penetration of the liquid, it is desirable that both side portions of the top sheet 30 be positioned on the front side of at least one of the liquid impermeable sheet 11 and the three-dimensional gather 60.

(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 has a width that fits on the back side of the absorbent element 50 as shown in the drawing, and in order to improve leakage prevention, the liquid-impermeable sheet 11 wraps around both sides of the absorbent element 50 and faces the side surface 30 of the absorbent element 50. It can also extend to both sides of the. 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.

(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. 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 superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The ratio of particles remaining on the sieve is preferably 30% by weight or less, and the ratio of particles remaining on the sieve by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006). Is preferably 60% by weight or more.

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

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

  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.

(Three-dimensional gather)
As shown in FIGS. 1, 3, 4, and 6, the three-dimensional gather 60 is a belt-like assembly that extends along both side portions of the interior body 200, and travels on the top sheet 30 in the lateral direction. It is provided in order to block excrement such as urine and feces that move to the side and prevent side leakage.

  Characteristically, the three-dimensional gather 60 of the present embodiment has a mounting portion 65 fixed to a mounting portion on the back side of the absorber 56 in the main body 201 and spaced from the side edge of the main body 201 to the center in the width direction. Of the extending portion 66 extending laterally from the mounting portion 65 and folded back once or a plurality of times on the front side, and the front-rear direction end portion and the front-rear direction intermediate portion of the extending portion 66 The folding fixing portion 67 formed by being fixed between the side edge of the main body portion 201 and the mounting portion of the mounting portion 65 in a state where both ends are folded, and the intermediate portion in the front-rear direction are not fixed to the main body portion 201. And a gather elastic elastic member 63 fixed in an extended state along the front-rear direction at least at the tip of the free portion 68.

  In this three-dimensional gather 60, the folding fixing portions 67 positioned at the front and rear end portions are fixed to the back side of the absorbent body 56 in the main body portion 201. Therefore, as shown in FIG. 4 and FIG. The surface can absorb excrement throughout the front and rear. Therefore, it is possible to prevent leakage of excrement caused by the overlying portions of the front and rear ends of the three-dimensional gather 60, which is inevitable with the conventional three-dimensional gather 60. Further, as shown by a two-dot chain line in FIG. 3 and as shown in FIG. 11, even if the folding fixing portion 67 is fixed to the back side of the absorbent body 56 in the main body portion 201, the free portion 68 remains in the main body. Since it is not fixed to the part 201, it can be raised to the body side via the side of the main body part 201. At this time, the contraction force of the gather elastic elastic member 63 acts to bring the front and rear folding fixing portions 67 closer, and the free portion 68 comes into elastic contact with the body in a standing state. Therefore, the same leakage prevention function as that of a conventional three-dimensional gather can be exhibited.

  The number of turns of the extended portion 66 is not particularly limited, and may be an odd number of times such as 1 as shown in FIGS. 9 and 10, but in this case, the tip of the extended portion 66 is located at the center in the width direction. When the folding fixing portion 67 is fixed to the back side of the absorber 56, the free portion 68 is difficult to go around the side of the main body 201. On the other hand, as shown in the figure, the free portion 68 can be more easily turned around when the extension portion 66 is folded evenly and the tip portion is directed to the side. 3 and 4, since the number of times of folding is two, as shown in FIGS. 3 and 11, the base portion of the free portion 68 of the three-dimensional gather 60 is in the width direction. It stands up diagonally toward the center side, and the portion on the tip side from the middle portion stands up diagonally outward in the width direction and comes into contact with the periphery of the leg in a planar shape. On the other hand, as shown in FIG. 9 and FIG. 10, when the number of times of folding is one, a three-dimensional gather that contacts in a linear manner is obtained.

  Furthermore, not only the number of times of folding is set to an even number as shown in the figure, but when the distal end portion 66t of the extended portion 66 protrudes from the side edge of the main body portion 201 at least with respect to the free portion 68, the free portion 68 becomes The gather elastic elastic member 63 is preferable because it naturally rises to the body side via the side of the main body 201 due to the contraction force of the gather elastic elastic member 63. In this case, as shown in FIG. 11, if the entire front-rear direction of the extending portion 66 protrudes from the side edge of the main body portion 201 and is not fixed to the main body portion 201, as shown in FIG. The folding fixing portion 67 also rises to the side of the main body 201, although only the tip 66t. That is, it has a rising portion extending over the entire front-rear direction, and the leakage prevention property at the front-rear ends of the three-dimensional gather 60 is further improved. Needless to say, the entire extending portion 66 can be configured to be hidden behind the main body 201.

  The attachment part 65 and the folding fixing part 67 of the three-dimensional gather 60 can be fixed to the main body part by a hot melt adhesive or heat sealing.

  As long as the attachment portion 65 of the three-dimensional gather 60 is attached to the back side of the absorbent body 56 in the main body portion 201, the back surface of the main body portion 201 as in the illustrated embodiment (in the illustrated embodiment, the wrapping of the top sheet 30 from the liquid-impermeable sheet 11 is performed. It can also be fixed by being sandwiched between appropriate members such as between the liquid-impermeable sheet 11 and the absorbent element 50.

  The separation distance 65d from the side edge of the main body 201 to the mounting portion 65 can be determined as appropriate. For example, about 10 to 45 mm when considering from infants to adults, and about 10 to 25 mm when considering only infants. It can be.

  The three-dimensional gather 60 may have a single layer structure, but a band-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 is folded in the width direction (or a plurality of sheets may be bonded together). It is preferable that the gather elastic elastic member 63 is fixed in an extended state along the longitudinal direction between the layers.

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 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 gather elastic elastic member 63, rubber such as thread, string, belt, and net can be used. In the case of using a slender elastic stretch member such as a yarn thread or string, 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 250 to 300%.

  When an elongated elastic elastic member is used as the gather elastic elastic member 63, it is preferable to provide a plurality of the elastic elastic members with an interval in the width direction, and the number is preferably about 2 to 10, for example, about 5 to 9. In this case, the arrangement interval 60d of the gather elastic elastic members 63 can be determined as appropriate, but 3 to 15 mm is appropriate in order to make it easy to hit the skin. The three-dimensional gather 60 may be provided with a gather elastic elastic member 63 not only at the tip side but also at the base side.

  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 extending portion 66 in the unfolded state) W6. Is preferably 15 to 60 mm, more preferably 20 to 40 mm. In addition, the distance W3 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.

  As illustrated, a waterproof film 64 similar to the liquid-impermeable sheet 11 may be interposed between the layers of the three-dimensional gather 60. In this case, since the waterproof film 64 is not provided in the front-rear direction range of the folding fixing portion 67, the folding fixing portion 67 can be prevented from being hardened.

<Effect confirmation test>
A pants-type disposable diaper (Example) similar to the embodiment shown in FIGS. 1 to 8 and 11 and a pants-type disposable diaper (Comparative Example) described in Patent Document 3 are prepared and attached to an infant dummy doll. Artificial urine is injected at a rate of 750 ml / min from a urination port (5 mm in diameter) assuming a boy of an infant dummy while lying face down on the top, 210 ml in total at a rate of 750 ml / min, and then absorbed. Checked the situation. The examples and comparative examples differ only in the structure related to the three-dimensional gathers, and the other parts are the same up to the material and the structure. In particular, the absorbent bodies of Examples and Comparative Examples are made by mixing high-absorbent polymer particles with cotton-like pulp, the weight of the cotton-like pulp being 110 g / m ^2, and the weight of the super-absorbent polymer particles being 205 g. / M ² .

  As a result, in the comparative example, as shown by a circle in FIG. 12 (a), the urine (gray portion) leaked over the front end portion (falling portion) of the three-dimensional gather. Then, as shown in FIG. 12 (b), artificial urine (gray portion) was effectively blocked even at the front end of the three-dimensional gather, and no leakage occurred.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
“Front-rear direction (vertical direction)” means a direction connecting the ventral side (front side) and back side (rear side), and “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%.
-"Gel strength" is measured as follows. 49.0 g of artificial urine (urea: 20 wt%, salt: 8 wt%, calcium chloride dihydrate: 0.3 wt%, magnesium oxide heptahydrate: 0.8 wt%, pure water: 70.01 wt%), Add 1.0 g of superabsorbent polymer and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
- "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 10 gf / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.

  If this invention is provided with a three-dimensional gather, it can utilize for absorbent articles, such as disposable diapers, such as a pants type, a tape type, a pad type, and a sanitary napkin.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impermeable sheet | seat, 12 ... Exterior body, 12A ... Side seal part, 12r ... Folded part, 25 ... Print sheet, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 DESCRIPTION OF SYMBOLS ... Absorber, 58 ... Packaging sheet, 60 ... Solid gather, 62 ... Gather sheet, 63 ... Gather elastic elastic member, 65 ... Attachment part, 66 ... Extension part, 67 ... Folding fixing part, 68 ... Free part, 201 ... Body part.

Claims (5)

A liquid-permeable top sheet, a back-side liquid-impermeable sheet, and a main body part that is a part having an absorbent body interposed therebetween,
In an absorbent article provided with a three-dimensional gather provided on both sides of the main body,
The three-dimensional gather is
An attachment portion fixed to an attachment portion on the back side of the absorber in the main body portion and spaced from the side edge of the main body portion toward the center in the width direction, and the front side extending from the attachment portion to the side Of the extension part, and both the front and rear direction end parts and the front and rear direction intermediate part of the extension part, the side edges and the attachment in the main body part are folded A folding and fixing portion that is fixed between the body portion, a free portion that is formed such that an intermediate portion in the front-rear direction is not fixed to the main body portion, and at least a front end portion of the free portion in the front-rear direction A gather elastic elastic member fixed in an extended state along,
An absorbent article characterized by the above.   2. The absorbent article according to claim 1, wherein the extending portion is even-folded, and at least a distal end portion of the free portion protrudes laterally from a side edge of the main body portion.   The absorbent article according to claim 2, wherein the entire front-rear direction of the extending portion protrudes from a side edge of the main body portion and is not fixed to the main body portion.   Whether the main body has a width in which the top sheet extends around the side of the absorber and extends to the back side of the absorber, and the liquid-impermeable sheet fits on the back side of the absorber. Alternatively, the absorbent article according to any one of claims 1 to 3, wherein the absorbent article extends around a side of the absorbent body and extends to a front side of the absorbent body.   A waist opening for passing the wearer's torso and a pair of left and right leg openings for allowing the legs to pass through, where both sides of the outer body that forms the front body and both sides of the exterior body that forms the back body are joined in advance or in use. The absorbent article according to any one of claims 1 to 4, wherein each of the absorbent articles is a disposable diaper in which an interior body that forms the main body is attached to the inside of the exterior body.