JP5650299B2 - Pants-type disposable diaper - Google Patents

Description

  The present invention relates to a pants-type disposable diaper having a three-dimensional gather on both sides.

  In order to prevent so-called side leakage, pants-type disposable diapers have been well-established with band-shaped three-dimensional gathers extending in the front-rear direction on both sides in the width direction, and have an excellent fit and anti-leakage effect At the same time, various three-dimensional gathers have been proposed so that the crotch part has a clean appearance.

  However, the conventional three-dimensional gather reduces the sense of incongruity around the legs and prevents exudation (excretion fluid that exudes from the side of the absorber due to the pressure applied to the absorber penetrates into the three-dimensional gather and exudes to the outside of the three-dimensional gather. To prevent).

  That is, it is desirable to equip the three-dimensional gathers double from the viewpoint of the bleeding prevention performance (see Patent Document 1). However, in this case, the thickness of the three-dimensional gathers increases, so that a sense of discomfort tends to occur around the legs. Therefore, from this point, it is desirable that the solid gather is single. However, when the three-dimensional gather is single, the excretory fluid is likely to ooze out, and in order to prevent this, a waterproof resin film is sandwiched in the three-dimensional gather (see Patent Document 2), and the waterproof provided on the back side of the absorber. A solution such as extending the resin film in the width direction and wrapping the side portion of the absorber (see Patent Document 3) is required.

  However, these solutions are inevitably stiff around the legs due to the hardness specific to the waterproof resin film.

  In particular, in a pants-type disposable diaper, an exterior sheet and an interior body that is an absorption holding part of excrement are main components, and solid gathers are provided on both sides of the interior body, and excrement is placed outside the solid gathers. A structure with no or few receiving parts is common. This structure has a clean leg circumference and less discomfort, and is related to the fact that the pants-type disposable diaper mainly assumes wearers with a lot of leg movement. However, in this general structure, there is nothing to catch the excretion fluid that has exuded from the three-dimensional gather, so that the clean feeling around the legs as in Patent Document 1 is somewhat sacrificed and the double three-dimensional gather prevents leakage. At present, as in Patent Documents 2 and 3, the flexibility is somewhat sacrificed, and the side portions are covered with a waterproof resin film to prevent leakage.

JP 2002-102282 A JP 2011-072428 A JP 2009-082358 A

  The basic function of the three-dimensional gather is a leakage prevention function, and from that point of view, it is preferable to incorporate a waterproof resin film up to the tip of the three-dimensional gather to surely prevent bleeding. However, the three-dimensional gather is required to be firmly fixed in the lying state in the front and back, and joining means by material welding such as heat seal and ultrasonic seal is widely used as a means for that purpose. When the waterproof resin film is sandwiched, the waterproof resin film inside the lodging region is melted and solidified at the time of welding of the lodging region, and there is a problem that the feel of the lodging region becomes hard.

  Therefore, the main problem of the present invention is to achieve both reliable prevention of bleeding and prevention of hardening of the overlaid region.

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

<Invention of Claim 1>
The side seal part is formed by joining the both sides of the exterior sheet forming the front body extending from the crotch part to the ventral side and the both sides of the exterior sheet forming the back body extending from the crotch part to the back side. A waist opening for passing the wearer's torso and a pair of left and right leg openings for passing the legs,
A liquid-permeable top sheet, a back-side liquid-impermeable sheet, and an absorbent body interposed therebetween, and an interior body that covers from the back side through the crotch to the abdomen is attached to the inside of the exterior sheet And
One solid gather is provided on each side of the interior body,
The three-dimensional gather includes an attachment part fixed to the back surface of the side part of the interior body, a main body part extending from the attachment part to the front side of the interior body through the side of the interior body, both front-back ends and of the longitudinal direction intermediate portion has a collapsed region opposite end portions are formed by welded and fixed in the inclined state before and after, and a free region that is formed by the front-rear direction intermediate portion and the non-fixed In addition, a waterproof resin film is interposed between a plurality of laminated nonwoven fabric layers, and an elongated elastic member is fixed in an elongated state along the front-rear direction between the nonwoven fabric layers at least at the tip of the free region. Yes,
The waterproof resin film for preventing bleeding is present in the lodging region,
The melting point of the waterproof resin film is higher than the melting point of the nonwoven fabric in the three-dimensional gather,
A pants-type disposable diaper characterized by that.

(Function and effect)
By providing such a difference in melting point even if the waterproof resin film does not exist in the entire lying region, or at least does not have a structure that exists in the attachment portion but does not exist directly under the nonwoven fabric layer on the surface, While ensuring the leakage prevention performance using the resin film, the waterproof resin film inside the lodging region is difficult to melt and solidify due to the difference in melting point during welding of the lodging region, and the feeling in the lodging region is hard to be hardened.

  As described above, according to the present invention, it is possible to achieve both advantages such as reliable prevention of bleeding and prevention of hardening of the overlaid region.

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. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. It is a perspective view of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing only the principal part of a pants type disposable diaper. FIG. 4 is a sectional view taken along the line 4-4 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. FIG. 4 is a sectional view taken along the line 4-4 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. FIG. 4 is a sectional view taken along the line 4-4 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 a side view of the example of a baby's body shape.

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 sheet 12 that forms the outer surface (rear surface) of the product and an interior body 200 that is attached to the inner surface of the exterior sheet 12. Symbol Y indicates the total length of the diaper in the deployed state (the length in the vertical direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and symbol X indicates the diaper in the deployed state. The full width of is shown.

  The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that supports the interior body 200 with respect to the wearer's body. The interior body 200 may be fixed to the inner surface of the exterior sheet 12 over its entire width, but as shown in FIG. 4, it is preferable that both side portions are not fixed and can be moved with respect to the exterior sheet 12. is there. The width of the non-fixed portion of the interior body 200 in this case may be determined as appropriate, and extends to the vicinity of the end portion on the center side in the width direction of the elongated elastic stretch members 15 to 19 described later as in the example shown in FIG. In addition, it can also extend further to the width direction center side from the edge part of the width direction center side of the elongate elastic expansion-contraction members 15-19 mentioned later.

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. In addition, “front-rear direction” means a direction connecting the ventral side (front side) and the back side (rear side), “width direction” means a direction (left-right direction) perpendicular to the front-rear direction, and “up-down direction mounting state of the diaper 100 and ", i.e. a direction perpendicular to the cylinder circumferential up direction when the diaper 100 to superimpose the front body side portions and the back body side portions folded into two at the crotch portion of the diaper 100, in other words This means the direction connecting the waist opening WO side and the crotch part side.

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

Outer sheet 12, the side seal portion of the longitudinal extent (front body F of the front and rear and the body peripheral Ri portion T that is determined as a direction range, portions for forming the leg openings LO extending from the waist opening WO to upper ends of the leg openings LO And an intermediate portion L defined as a front / rear direction region having a side seal portion 12A of the back body B. Girth Ri unit T can conceptually be divided into a "waist edge" W to form the edge of the waist opening, "lower waist" and U is a lower part than this. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist edge W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior sheet 12 can be determined as appropriate, and, as shown in FIGS. 1 to 8, the narrowest part may be narrower than the width of the interior body 200 in order to obtain a clean appearance. 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 sheet 12 is formed by bonding two sheet base materials 12 </ b> S and 12 </ b> H with an adhesive such as a hot melt adhesive, and is located on the inner side. Although the base material 12H extends only to the edge of the waist opening WO, the outer sheet base material 12S wraps around the waist side edge of the inner sheet base material 12H and is folded back to the inside. 12r is extended so that it may coat | cover up to the waist side edge part of the interior body 200. FIG.

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

Moreover, it is preferable that the total basis weight of the exterior sheet 12 is about 20 to 60 g / m ² so that the design of the printing sheet 25 to be described later can be satisfactorily viewed from the outer surface of the product through the exterior sheet 12. The total light transmittance specified in 7105 is preferably 40% or more, particularly 50% or more.

Then, the outer sheet 12, in order to increase the girth Rinitaisuru fit, both the sheet substrate 12S, elongated resilient and elastic members 15 to 19 rubber threads are used between 12H is provided at a predetermined extension ratio . As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the sheet bases 12S and 12H of the exterior sheet 12 and fixing the elongated elastic members 15 to 19 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic bonding by various coating methods is used. Can do. If the entire exterior sheet 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, the entire width direction is continuous between the inner surface of the inner sheet base 12H and the outer surface of the folded portion 12r of the outer sheet base 12S at the waist edge W of the rear body B and the front body F. As described above, the plurality of waist edge elastic elastic members 17 are fixed in a state of being spaced apart in the vertical direction and extended along the width direction at a predetermined extension rate. In addition, one or more of the waist edge elastic elastic members 17 disposed in a region adjacent to the waist lower portion U may overlap with the interior body 200 or may be overlapped with the interior body 200 in the width direction. You may each provide in the width direction both sides except a center part. The waist edge elastic elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. Further, the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .

  Further, between the outer side surface of the inner sheet base 12H and the inner side surface of the outer sheet base 12S in the lower waist U of the front body F and the rear body B, except for the widthwise central portion overlapping the interior body 200, A plurality of waist lower elastic elastic members 15, 19 made of an elongated elastic elastic member are continuously provided over the entire width direction on each of the upper side and both sides in the width direction, with a predetermined interval in the vertical direction 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 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 1 to 15 mm, particularly 3 to 8 mm, and about 5 to 30 at an elongation of 200 to 350%, particularly about 240 to 300%.

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

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

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

  In addition, when the elongated elastic elastic members 15 to 19 of each part cross a printing sheet 25 described later, when rubber containing titanium oxide is used as the elongated elastic elastic members 15 to 19, the content of titanium oxide is It is preferable to use a low one (for example, 2% or less) or one containing no titanium oxide.

(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 exterior sheet 12. The post-processing tape 70 is for fixing the diaper 100 in a state of being rounded or folded so that the top sheet 30 is on the inner side and the front body F is on the inner side. As shown in FIG. 5, in the general post-processing tape 70, a base end portion 71 is fixed to the outer surface of the exterior sheet 12 with an adhesive or the like, and a portion on the front end side of 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 top sheet 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 printed sheet 25 that is designed by printing is provided between the inner body 200 and the outer sheet 12 (including the layers of the outer sheet 12). The exterior sheet 12 may be omitted, and 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 interior body 200. 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 resin film, a nonwoven fabric, paper, or the like can be used, but a bulky material having high air permeability is preferable. When using a resin film, it is desirable to have moisture permeability 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.

(Exterior sheet split structure)
In the above example, but before covering continuously the integral outer sheet 12 to the back body B from the body F, the exterior sheet, and the ventral side outer sheet covering the Rino Shu out ventral wearer It is divided into a backside exterior sheet that covers the back side, and the front end of the interior body is connected to the inner surface of the center part in the width direction of the abdominal side exterior sheet by a hot melt adhesive or the like, and the width direction of the backside exterior sheet The rear end portion of the interior body is connected to the inner surface of the central portion by a hot melt adhesive or the like, and the abdomen side exterior sheet and the back side exterior sheet are not continuous on the crotch side, and are separated from each other. be able to. This separation distance can be about 150 to 250 mm. In this case, on the back surface of the back side liquid-impermeable sheet in the interior body, so as to cover the entire back surface of the interior body, or so as to cover the entire portion exposed between the abdominal side exterior sheet and the back side exterior sheet, The crotch outer sheet can also be fixed. As the crotch outer sheet, the same material as that used for the outer sheet described above can be used. The crotch outer sheet also corresponds to the outer sheet 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 top sheet 30 on the body side, a back-side liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. It is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a three-dimensional gather 60 that stands on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(Top sheet)
The top sheet 30 has a property of allowing liquid to pass through, 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. .

  The top sheet 30 may be composed of a single sheet or 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.

(Intermediate sheet)
An intermediate sheet (also referred to as a “second sheet”) 40 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 by 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 materials 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.

(Back side liquid impervious sheet)
The material of the back side liquid-impermeable sheet 11 is not particularly limited. For example, a waterproof resin film made of an olefin resin such as polyethylene or polypropylene, or a laminated nonwoven fabric provided with a waterproof resin film on the surface of the nonwoven fabric. An example is a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to a waterproof resin film. For the back side 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 waterproof resin film having moisture permeability, a microporous waterproof 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. Resin films are 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 waterproof resin film can also be used as the back-side liquid-impermeable sheet 11.

  The back-side liquid-impermeable sheet 11 is preferably extended to both sides of the side surface of the top sheet 30 of the absorbent element 50 so as to enhance 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 back side 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. If it is the shape of the absorbent body 56 itself and the three-dimensional gathers 60, it is improved, which is preferable fit of the leg circumferential Rie.

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

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 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)
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, rises from the side portion of the interior body 200, travels on the top sheet 30, and moves in the lateral direction. It is provided to block loose stool and prevent side leakage. The three-dimensional gather 60 of the present embodiment is provided in a single layer on each of the left and right sides 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 middle portion It stands up diagonally toward the outside in the width direction. Thus, if the three-dimensional gather 60 on each side is single, the three-dimensional gather 60 does not feel thick and stiff.

  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. A plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction with a gap in the width direction. The base end portion (the end portion on the opposite side to the sheet folding portion 12r in the width direction) located on the opposite side to the front end portion of the three-dimensional gather 60 is an attachment portion 65 fixed to the back surface of the side portion of the interior body 200, The portion other than the attachment portion 65 is a main body portion 66 (a portion on the folded portion 12r side) that extends from the attachment portion 65 to the front side of the interior body 200 through the side of the interior body 200. The main body portion 66 includes a root side portion that extends toward the center in the width direction and a tip side portion that is folded back outward in the width direction from the tip of the root side portion. This form is a surface contact type three-dimensional gather 60, but a line contact type three-dimensional gather 60 (not shown) that is not folded outward in the width direction can also be employed. And while the front-and-rear direction both ends of the main-body part 66 are set as the fall area | region 67 fixed with respect to the side part surface of the top sheet 30 in the lying state, the front-back direction intermediate part located between these is unfixed. The elongated elastic member 63 extending in the front-rear direction is fixed to the free region 68 in an extended state.

  As means for fixing the lodging region 67, means for joining the materials together by welding the materials, such as heat sealing or ultrasonic sealing, is used. The pattern can be determined as appropriate. For example, as shown in the drawing, a rectangular welded portion 67m extending along an oblique direction is provided in parallel with a predetermined interval in the vertical direction. Can do.

The gather sheet 62 can be used without particular limitation as long as it is a non-woven fabric, but in general, it is flexible and uniform such as a spunbond non-woven fabric (SS, SSS, etc.), an SMS non-woven fabric (SMS, SSMMS, etc.), a melt blown non-woven fabric, etc. A non-woven fabric excellent in concealability can be suitably used if necessary with a water repellent treatment with silicon or the like, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%.

  The number of the elongated elastic stretch members 63 provided in the free region of the three-dimensional gather 60 is preferably 2-6, and more preferably 3-5. 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 back side liquid-impermeable sheet 11, and the absorbent element 50 in the interior body 200.

  In the three-dimensional gather 60 configured in this way, the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought closer, but the body part 66 is fixed so that both ends in the front-rear direction do not stand up. On the other hand, since the space between them is a non-fixed free region, only the free region stands up so as to contact 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 main body portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 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.

<Waterproof resin film for preventing bleeding>
At least the free region 68 in the three-dimensional gather 60 is provided with a waterproof resin film 64 for preventing bleeding between the gather sheets 62. As the waterproof resin film 64 for preventing bleeding, the same material as the back side liquid-impermeable sheet 11 can be suitably used. Although the waterproof resin film 64 for preventing bleeding can extend from the attachment portion 65 to the tip of the three-dimensional gather 60, the tip of the three-dimensional gather 60 is a portion that contacts the skin. The waterproof resin film 64 for use is preferably up to the vicinity of the tip as in the illustrated example.

  The basic function of the three-dimensional gather 60 is a leakage prevention function, and from that point of view, it is preferable to incorporate a waterproof resin film for preventing bleeding to the tip of the three-dimensional gather 60 to reliably prevent bleeding. However, the lodging area 67 of the three-dimensional gather 60 is required to be firmly fixed, and as a means for that purpose, a joining means by material welding such as heat sealing or ultrasonic sealing is widely used. When the waterproof resin film 64 for preventing the sticking is sandwiched, the waterproof resin film 64 for preventing the bleeding inside the lying area 67 is melted and solidified when the lying area 67 is welded, and the feel of the lying area 67 becomes hard. In order to prevent the softening of the touch, the following four types are proposed.

<First form for preventing hardening of the lodging area>
As shown in FIGS. 3, 4, and 6, the first form is that the waterproof resin film 64 for preventing bleeding extends from the attachment portion 65 to the tip portion in the free region 68, and at least the attachment portion in the lying region 67. Although it exists in 65, it does not exist directly under the gathering sheet 62 layer of the surface. Such a structure can be seen from the developed state of the waterproof resin film 64 for preventing bleeding as shown by a two-dotted line in FIG. It can construct | assemble by notching the front-end | tip part (end part of the width direction outer side of an expansion | deployment top state), and making it the convex-shaped shape which faces sideways as a whole.

  By adopting such a structure, the waterproof resin film 64 for preventing bleeding is extended from the mounting portion 65 to the tip portion in the free region 68 which is the main portion, so that it does not bleed even when pressure is applied. The leak prevention performance can be ensured. Still, since the waterproof resin film 64 for preventing bleeding does not exist directly under the gather sheet 62 layer on the surface in the lodging region 67, the waterproof resin film for preventing bleeding in the inside of the lodging region 67 when the lodging region 67 is welded. 64 is difficult to melt and solidify, and the feel of the lodging region 67 is difficult to harden.

  In addition, since the waterproof resin film 64 for preventing bleeding is present at least at the attachment portion 65 in the lying region 67, the waterproof resin film 64 for preventing bleeding is continuous over the entire front and rear direction of the three-dimensional gather 60. Therefore, by simply changing the shape of the waterproof resin film 64 for preventing bleeding, the continuous strip-shaped waterproof resin film 64 for preventing bleeding can be obtained while transferring the continuous strip-shaped gather sheet 62 along its continuous direction. There is also an advantage that the existing manufacturing method of supplying and pasting along the continuous direction can be adopted as it is.

  The waterproof resin film 64 for preventing bleeding in the lodging region 67 may be only the attachment portion 65 as long as it is constructed in at least the attachment portion 65, but the root side portion toward the center in the width direction of the main body portion. (In other words, it is provided on the entire surface other than just under the gather sheet 62 layer on the surface), since the bleeding prevention performance in the lying region 67 is hardly impaired.

<Second form for preventing hardening of the lodging area>
However, unlike the first embodiment, as shown in FIGS. 9 and 10, the waterproof resin film 64 for preventing bleeding is extended from the mounting portion 65 to the tip portion in the free region 68, and in the lying region 67 as a whole. Forms that do not exist can also be employed.

<Third form for preventing the stiffening of the lodging area>
In the third embodiment, by selecting both materials such that the melting point of the waterproof resin film 64 for preventing bleeding is higher than the melting point of the gather sheet 62 in the three-dimensional gather 60, the waterproof resin film 64 for preventing bleeding is used. The waterproof resin film 64 for preventing oozing inside the lodging region 67 is made difficult to melt and solidify due to a difference in melting point when the lodging region 67 is welded. As a combination of such materials, the gather sheet 62 is a material having a melting point of about 80 to 130 degrees, for example, a nonwoven fabric composed of low melting point components, or a mixture of these low melting point components and other components such as high density polyethylene. Non-woven fabric made of a resin mixture, etc., and a waterproof resin film 64 made of a material having a melting point of about 140 to 180 degrees as the waterproof resin film 64 for preventing bleeding, such as an olefin-based resin such as polyethylene or polypropylene, or a waterproof resin on the surface of the non-woven fabric A combination of a laminated nonwoven fabric provided with a film and a laminated sheet in which a nonwoven fabric is laminated and bonded to a waterproof resin film can be employed.

  In the third embodiment, as shown in FIG. 11 and FIG. 12, the waterproof resin film 64 for preventing bleeding is provided to the tip of the three-dimensional gather 60 over the entire fall region 67 and the free region 68. However, when the lodging region 67 is welded, the waterproof resin film 64 for preventing oozing inside the lodging region 67 is difficult to melt and solidify due to the difference in melting point, and the feeling of the lodging region 67 is hard to be hardened. Of course, the third embodiment is different from the first embodiment and the second embodiment in that the waterproof resin film 64 for preventing bleeding does not exist in the entire lying region 67 or at least in the mounting portion 65. However, it can be employed in a structure that does not exist directly below the gather sheet 62 layer on the surface, and can also be combined with fourth and fifth embodiments described later.

<Fourth form for preventing hardening of the lodging area>
As shown in FIG. 13 and FIG. 14, the fourth form is that the lodging region 67 is fixed by the hot melt adhesive 67 h, and the welded portion 67 m for fixing the lodging region 67 is arranged in the width direction in the lodging region 67. It is provided in a linear pattern extending in the vertical direction only at the intermediate portion. As described above, when the lodging region 67 is fixed, the whole is fixed with the hot melt adhesive 67h, and based on this, the linear pattern welded portion 67m is provided only in the intermediate portion in the width direction to supplement the fixing strength. The overlying region 67 is fixed by the hot melt adhesive 67h, and the waterproof resin film 64 for preventing bleeding does not solidify, and is a linear shape extending in the vertical direction even if the welded portion 67m supplements the fixing strength. At the same time, since the waterproof resin film 64 for preventing bleeding at the welded portion 67m is melted and hardened, the hard portion is hard to hit the skin.

  The pattern of the welded portion 67m may be a continuous line pattern, but a dotted line intermittent pattern is preferable as in the illustrated example. The overall shape may be a straight line extending in the vertical direction as in the illustrated example, or may be a wavy line or an arc.

  Further, the application site of the hot melt adhesive 67h may be appropriately determined. As shown in the illustrated example, the entire lying region 67 may overlap the welded portion 67m, or a part of the lying region 67 in the width direction, for example, welding. It can be made into parts other than part 67m.

<Fifth form to prevent hardening of the lodging area>
As shown in FIG. 15, the fifth form is based on a normal form in which the three-dimensional gather 60 is extended to the waist side from the top facing region 69 facing the top 101 of the abdominal bulge. The lying region 67 is positioned on the crotch side with respect to the top facing region 69, and the lodging region 67 by welding is not provided on the top facing region 69 and on the waist side. As shown in FIG. 16, the portion of the lying area 67 of the three-dimensional gather 60 that hits the wearer's abdomen is a top facing area 69 that faces the top 101 of the abdominal bulge. By providing 67, even if the waterproof resin film 64 for preventing bleeding at the welded portion 67m is melted and solidified, the hard portion is difficult to hit the skin.

  In this case, in order not to provide the lodging region 67 by welding in the top facing region 69, the top facing region 69 is made the same as the free region 68 without providing the lodging region 67, and the top facing region 69 is collapsed. Fixing with a hot melt adhesive in a state to form a flexible region is also included.

  The lying area 67 at the rear end of the three-dimensional gather 60 on the back side is not located at the bulge 102 of the buttocks as shown in FIG. Even if the waterproof resin film 64 for preventing bleeding is melted and solidified in the welded portion 67m of the rear end lying region 67, the hard portion is hardened. Is difficult to hit the skin.

<Others>
As can be seen from the descriptions of the above-described embodiments, the first to fifth embodiments can be used in combination.

  The present invention can be used for a pants-type disposable diaper as in the above example.

  DESCRIPTION OF SYMBOLS 11 ... Back side liquid impervious sheet, 12 ... Exterior sheet, 12r ... Folded part, 25 ... Print sheet, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 DESCRIPTION OF SYMBOLS ... Packaging sheet, 60 ... Solid gather, 62 ... Gather sheet, 68 ... Free area, 67 ... Lodging area, 64 ... Waterproof resin film for preventing bleeding, 65 ... Mounting part, 67m ... Welding part, 69 ... Top facing area.

Claims (1)

The side seal part is formed by joining the both sides of the exterior sheet forming the front body extending from the crotch part to the ventral side and the both sides of the exterior sheet forming the back body extending from the crotch part to the back side. A waist opening for passing the wearer's torso and a pair of left and right leg openings for passing the legs,
A liquid-permeable top sheet, a back-side liquid-impermeable sheet, and an absorbent body interposed therebetween, and an interior body that covers from the back side through the crotch to the abdomen is attached to the inside of the exterior sheet And
One solid gather is provided on each side of the interior body,
The three-dimensional gather includes an attachment part fixed to the back surface of the side part of the interior body, a main body part extending from the attachment part to the front side of the interior body through the side of the interior body, both front-back ends and of the longitudinal direction intermediate portion has a collapsed region opposite end portions are formed by welded and fixed in the inclined state before and after, and a free region that is formed by the front-rear direction intermediate portion and the non-fixed And a waterproof resin film for preventing bleeding is interposed between the laminated nonwoven fabric layers, and an elongated elastic member is fixed in an elongated state along the front-rear direction between the nonwoven fabric layers at least at the tip of the free region. And
The waterproof resin film for preventing bleeding is present in the lodging region,
The melting point of the waterproof resin film for preventing bleeding is higher than the melting point of the nonwoven fabric in the three-dimensional gather,
A pants-type disposable diaper characterized by that.

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