JP5638305B2 - Pants-type disposable diaper - Google Patents

Description

  The present invention relates to a pants-type disposable diaper.

  The pants-type disposable diaper includes an exterior sheet having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, and the front body and the back body of the exterior sheet are on both sides. By joining, a waist opening and a pair of left and right leg openings are formed. Hereinafter, the fixing portion between the exterior sheet and the interior body is also referred to as an inner / outer fixing portion.

In the pants-type disposable diaper, in order to improve the fit to the body, various elastic elastic members are fixed to the exterior sheet in an expanded state (for example, see Patent Documents 1 to 7). The one having a fitting elastic expansion / contraction member on the crotch side than the waist elastic expansion / contraction member provided at the edge of the waist opening (represented by the description in Patent Document 6) has a relatively good fit to the body. It is expensive.
The attachment range of the fit elastic elastic member is different from the waist elastic member in the vertical range with the interior body, but the part with the interior body has an inner and outer fixed part, and the fit elastic so as to cross this inner and outer fixed part Even if an expansion / contraction member is provided, the expansion / contraction function is limited by the rigidity of the absorber. In addition, the interior body may shrink in the width direction, thereby deteriorating the wearing feeling and appearance, and the absorbent body may be twisted or cracked, resulting in a decrease in absorption performance. For this reason, conventionally, the elastic elastic member is continuously attached along the width direction, and the entire portion overlapping the inner and outer fixing portions is finely cut so that the shrinkage force in the width direction does not act on the interior body. Such a structure is generally employed (see, for example, Patent Document 1).
However, if the range of contraction force action of the fitted elastic elastic member becomes narrow, the amount of expansion and contraction in the width direction has to be reduced, and it becomes difficult to ensure a large unevenness on the body surface, particularly good fit to the buttocks. If only the amount of expansion and contraction is sufficient, even if the range of contraction force action is narrow, it can be ensured by increasing the elongation rate when the elastic expansion / contraction member is fixed, but in that case, tightening becomes tight.

JP 2001-61890 A JP 2010-57567 A JP 2005-87622 A

  Then, the main subject of this invention is expanding the expansion-contraction amount of the width direction, maintaining appropriate clamping | tightening in the site | part which has a fitting elastic expansion-contraction member.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The exterior sheet constituting the front body and the back body, the interior body including the absorbent body provided at the center in the width direction of the inner surface of the exterior sheet from the front body to the back body, and the exterior sheet and the interior body are fixed. With internal and external fixing parts,
By joining both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body, a waist opening and a pair of left and right leg openings are formed,
An elongate fit fixed in a stretched state along the width direction on both the left and right sides of the interior body in the longitudinal range having the interior body in at least one of the front body and the back body, excluding the central portion in the width direction of the interior body In a pants-type disposable diaper where a plurality of elastic elastic members are provided at intervals in the vertical direction,
In the body having the fit elastic elastic member, in the longitudinal range having the fit elastic elastic member, the width of the inner / outer fixing portion is narrower than both the front and rear sides, and the widthwise center from the side edge of the inner / outer fixing portion having a narrow width A large stretchable part is provided on the side and in the width direction outside where the fit elastic stretchable member extends to a range of 30 mm .
In the longitudinal range having the fit elastic stretch member, the fit elastic stretch member is also provided before and after the large stretch portion, and the width direction center side of the fit elastic stretch member located before and after the large stretch portion Is located on the outer side in the width direction than the end on the center side in the width direction of the fit elastic elastic member located in the large elastic part ,
A pants-type disposable diaper characterized by that.

(Function and effect)
In this way, rather than simply adjusting the contraction force action range and elongation rate of the fit elastic elastic member, by locally narrowing the width of the inner and outer fixing parts and widening the attachment range of the fit elastic elastic member only by that part, The amount of expansion and contraction in the width direction can be increased while maintaining appropriate tightening. In addition, the width of the inner and outer fixing portions is not narrowed in the entire longitudinal range having the fit elastic elastic member, but only the inner and outer fixing portions are narrower than the front and rear sides of only a part (large elastic portion). Fixing with the seat is not insufficient.
In addition, when the width of the contraction force acting range is also changed in accordance with the change in the width of the inner and outer fixed portions, the fitting property with respect to the swelling of the heel portion becomes even better.

<Invention of Claim 2>
The large stretchable part is provided at least in the longitudinal range corresponding to the top of the buttocks in the back body, and the width of the inside / outside fixed part on both the front and back sides of the large stretchable part in the back body is the inside / outside fixed part of the large stretchable part. The underpants type disposable diaper of Claim 1 wider than the width | variety.

(Function and effect)
In this way, by providing the large stretchable part in the collar part, the amount of expansion and contraction in the width direction of the collar part can be increased while maintaining appropriate tightening, and the fit of the collar part can be significantly improved.

<Invention of Claim 3 >
In the longitudinal range having the fit elastic stretch member, the fit elastic stretch member is provided on both the front and rear sides of the large stretch portion, and the fit elastic stretch member located on the large stretch portion is the large stretch portion. The underpants type disposable diaper of Claim 1 or 2 currently fixed in the state extended | stretched in the width direction with the extension rate lower than the fitting elastic elastic member located in both front and back sides.

(Function and effect)
As described above, when the expansion rate of the fit elastic expansion / contraction member of the large expansion / contraction part is lower than the expansion rate of the fit elastic expansion / contraction member of the non-large expansion / contraction part, the protrusions such as the buttocks contact the large expansion / contraction part at the time of wearing. However, it is preferable because a difference in tightening force between the large stretchable part and the non-large stretchable part is small.

  As described above, according to the present invention, there is an advantage that the amount of expansion and contraction in the width direction can be increased while maintaining appropriate tightening in the portion having the fit elastic expansion and contraction member.

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

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 8 show an example 100 of a pants-type disposable diaper. The pants-type disposable diaper 100 is composed of 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. The inner / outer fixing portion for fixing is denoted by reference numeral 300 in FIG. The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that is worn by the wearer. In addition, the dotted pattern in the cross-sectional view and FIG. 6 shows a joint part for joining the respective constituent members. These joint parts include the inner and outer fixing parts 300, solids such as hot melt adhesive, beads, curtains, summits, or the like. It can be formed by spiral coating or the like. The “front-rear direction” means the direction connecting the ventral side (front side) and the back side (rear side), “width direction” means the direction (left-right direction) orthogonal to the front-rear direction, and “up-down direction "In the state of wearing the diaper 100, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch portion so that both sides of the front body and the back body side of the diaper 100 are overlapped, in other words, For example, it means a direction connecting the waist opening WO side and the crotch side.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable back sheet 11, and an absorbent element 50 interposed therebetween. It is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows barrier cuffs 60 that stand on the body side and are provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

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

  Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

  When the barrier cuff 60 is provided, both sides of the top sheet 30 pass between the liquid-impervious back sheet 11 and the barrier cuff 60 to the back side of the absorbent element 50 to prevent the penetration of the liquid. It is preferable to adhere to the liquid-impermeable back sheet 11 and the barrier cuff 60 with a hot melt adhesive or the like.

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

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

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

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

The liquid-impermeable back sheet 11 is preferably extended to both sides of the side surface 30 of the absorbent element 50 by wrapping around both sides of the absorbent element 50 in order to improve leakage resistance. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.
Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable back sheet 11, especially the absorber 56 side surface.

(Barrier cuffs)
The barrier cuff 60 is a belt-like member that extends over the entire front and rear direction along both side portions of the interior body 200, blocks urine and soft stool that move laterally along the top sheet 30, and prevents side leakage. It is provided for this purpose. The barrier cuff 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion stands up obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the barrier cuff 60 is formed by folding a belt-like barrier sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 and folding it in the width direction. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end of the barrier cuff 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the topsheet 30 through the side portion of the interior body 200 and are hot-melted to the side surface of the topsheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic elastic member 63 along the front-rear direction is fixed to the free part in an extended state.

The barrier sheet 62 is made of a spunbonded nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric having excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. Further, as shown in the drawing, a waterproof film can be interposed between the barrier sheets folded in two.

  The number of the elongated elastic stretch members 63 provided in the free part of the barrier cuff 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 barrier cuff 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable back sheet 11, the absorbent element 50 in the interior body 200.

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

The dimensions of the barrier cuff 60 can be appropriately determined. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the barrier cuff 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, when the barrier cuff 60 is flatly folded so that the barrier cuff 60 is parallel to the surface of the top sheet 30, the distance W3 between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.
Unlike the illustrated embodiment, double (two rows) of barrier cuffs can be provided on the left and right sides of the interior body 200.

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

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

Although the absorbent body 56 may be rectangular, as shown in FIG. 6, as shown in FIG. 6, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. The shape is preferable because the fit of the absorbent body 56 and the barrier cuff 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.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

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

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

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

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

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Exterior 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.

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

  The exterior sheet 12 is provided with elongate elastic members 15 to 19 such as thread rubber at a predetermined elongation rate between the sheet bases 12S and 12H in order to improve the fit to the waistline. 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 width 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 end (upper end) W of the rear body B and the front body F is a width. The plurality of elongated waist elastic elastic members 17 are fixed in a state where they are extended in the width direction at a predetermined extension rate and spaced apart in the vertical direction so as to be continuous over the entire direction. In addition, one or a plurality of the waist elastic elastic members 17 disposed in the 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 center in the width direction. You may provide each in the width direction both sides except a part. The elastic waist member 17 has 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 1. the rubber thread 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%. Moreover, the waist part elastic expansion-contraction member 17 does not need to make all the same thickness and expansion | extension rate, For example, you may make it the thickness and expansion | extension rate of an elastic expansion-contraction member differ in the upper part and lower part 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 elongate waist lower elastic elastic members 15 and 19 are longitudinally spaced apart from each other on the upper side and both sides in the width direction in the width direction and at a predetermined elongation rate in the width direction. It is being fixed in the state extended along.

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 elongate intermediate elastic elastic members 16 are longitudinally spaced at a predetermined elongation rate so as to be continuous over the entire width direction at each part on both sides in the width direction. It is fixed in the state.

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

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

(Large elastic part)
Characteristically, as shown in FIG. 6, the region of the inner / outer fixing portion 300 that fixes the outer sheet 12 and the inner body 200 is arranged in the longitudinal range corresponding to the top of the buttocks in the back body B, and The waist lower elastic elastic member to the vicinity of the side edge of the inner / outer fixing part 301 having a narrower width than the inner / outer fixing parts 302 and 303 on both front and rear sides EF and EB. 15 and an intermediate elastic member 16 (in the present embodiment, these correspond to fit elastic elastic members) are extended, and a large elastic part EX is provided.

  The range in which the large stretchable part EX is provided can be appropriately determined according to the dimensions of the diaper. In the normal case, the front end (the edge of the waist opening WO of the front body F) is 0% of the total length Y of the diaper, and the rear When the end (the edge of the waist opening WO of the back body B) is defined as 100%, it is preferably in the range of 4 to 30%.

  The width X2 of the inner / outer fixing portion 301 in the large extension / extraction portion EX is not particularly limited as long as it is narrower than the width X3 of the inner / outer fixing portions 302, 303 on both the front and rear sides EF, EB of the large extension / contraction portion EX. In a normal case, it is preferable that the width X4 is about 7 to 70% of the width X4 of the interior body 200. The widths X3 of the inner and outer fixing portions 302 and 303 on both the front and rear sides EF and EB are 70 of the width X4 of the interior body 200, respectively. It is preferable to be about -95%. Incidentally, the width X4 of the interior body 200 can be determined as appropriate, but is preferably about 20 to 50% of the total width X of the diaper. In addition, it is preferable that the longitudinal length of the inner and outer fixing portions 302 and 303 on both the front and rear sides EF and EB of the large stretchable portion EX is about 2 to 20% of the total length Y of the diaper. In addition, the dimension of each part of a diaper means the length in the expansion | deployment state which does not shrink | contract by an elastic member fundamentally.

As shown in FIG. 6, the waist lower elastic elastic member 15 and the intermediate elastic elastic member 16 are extended to the center in the width direction to the same position as the large elastic part EX on both the front and rear sides EF and EB of the large elastic part EX. Then , in both the front and rear sides EF and EB of the large stretchable portion EX, the width of the portion where the waist lower elastic stretchable member 15 and the intermediate elastic stretchable member 16 overlap with the inner and outer fixed portions 302 and 303 is widened, so There is a risk of shrinkage if necessary. Therefore, the waist lower elastic elastic member 15 and the intermediate elastic elastic member 16 are also extended to the vicinity of the side edges of the inner and outer fixing parts 302 and 303 on both the front and rear sides EF and EB of the large elastic part EX. This form is shown in FIG. 9, where a part of the middle elastic elastic member 16 is on the front side of the large elastic part EX, and a part of the waist lower elastic elastic member 15 is on the rear side of the large elastic part EX. The waist lower elastic elastic member 15 and the middle elastic elastic member 16 located at the front and rear of the large elastic part EX are located at the center in the width direction of the waist elastic elastic member at the lower elastic part EX. The member 15 and the intermediate elastic elastic member 16 are positioned on the outer side in the width direction than the ends on the center side in the width direction. As described above, when the width of the contraction force acting range is also changed in accordance with the change in the width of the inner and outer fixing portions 301, 302, and 303, the fitting property with respect to the swelling of the heel portion is further enhanced. In particular, as shown in the drawing, the widthwise central ends of the waist lower elastic elastic member 15 and the intermediate elastic elastic member 16 are arranged along the buttock on each of the left and right sides (each outward in the width direction toward the waist side and the crotch side). If it arrange | positions so that the curve 400 may be made | formed, the fit property to a collar part will become still more preferable.

  In addition, when the edge of the width direction center side of these waist lower elastic elastic members 15 and the intermediate | middle elastic elastic members 16 is made into the vicinity of the side edge of the inner / outer fixing parts 301, 302, 303, the distance is the inner / outer fixing parts 301, The width is set to 30 mm from the side edges of 302 and 303 to the center in the width direction and the outside in the width direction.

  On the other hand, when the expansion ratio at the time of attachment of the waist lower elastic elastic member 15 and the intermediate elastic elastic member 16 is made the same in the large elastic part EX and its front and rear sides EF and EB, Therefore, the large expansion / contraction part EX is extended more than the front and rear sides EF and EB, and the tightening force of the collar part may become excessively strong. Therefore, in order to solve this problem, the waist lower elastic elastic member 15 and the intermediate elastic elastic member 16 located in the large elastic part EX are replaced with the waist lower elastic elastic member 15 located on both the front and rear sides EF and EB of the large elastic part EX. And it is also preferable to fix in the state extended | stretched in the width direction with the extension rate lower than the intermediate part elastic elastic member 16. FIG. As a result, even if the large stretchable part EX is extended from both the front and rear sides EF and EB, the tightening force difference between the stretchable part and the non-large stretchable parts EF and EB is small, and the tightening force of the buttocks is excessively strong. It becomes difficult to become.

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

(Print sheet)
Between the liquid-impermeable back sheet 11 and the exterior sheet 12 (including the interlayer of the exterior sheet 12), a print sheet 25 that is designed by printing is provided. 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 absorber 56. The length of the printing sheet 25 is preferably about 15 to 30% of the total length Y of the article on at least one side of the stomach side and the back side. Further, the shape of the print sheet 25 is preferably a rectangle as shown in the figure in that trim loss does not occur. However, the print sheet 25 has a geometric shape such as a circle, an ellipse, a triangle, a hexagon, or a shape along the periphery of the design. You may cut it.

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

(Exterior sheet split structure)
In the above-described example, the front body F to the back body B are continuously covered with the integral exterior sheet 12, but the exterior sheet covers the stomach side of the wearer's waist and the back side The front end portion of the interior body is connected to the inner surface of the center portion in the width direction of the abdominal side exterior sheet with a hot melt adhesive or the like, and the center portion in the width direction of the back side exterior sheet. The rear end of the interior body is connected to the inner surface by a hot melt adhesive or the like, and the form in which the abdominal exterior sheet and the back exterior sheet are not continuous on the crotch side and are separated from each other may be adopted. it can. This separation distance can be about 150 to 250 mm. In this case, on the back surface of the liquid-impermeable back sheet in the interior body, so as to cover the entire back surface of the interior body, or so as to cover the entire portion exposed between the abdominal exterior sheet and the back 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.

(Other)
In the above example, the large expansion / contraction part EX is provided in the longitudinal range corresponding to the top of the buttocks in the back body B, but in addition to or instead of this, it is provided in other parts such as the lower abdomen of the front body F. It is also possible. In the above example, even in the front body F that does not have the large stretchable part EX, the waist lower elastic stretchable member 19 and the intermediate elastic stretchable member 18 are on both sides in the widthwise direction except for the widthwise central portion where the interior body 200 overlaps. In the body that does not have the large expansion / contraction part EX, the waist lower elastic expansion / contraction member and the intermediate elastic expansion / contraction member cross the interior body 200 from the one side in the width direction to the other. It can also be provided up to the side so that the stretching force acts over the entire width direction.

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

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious back 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 ... Packaging sheet, 60 ... Side barrier cuff, 62 ... Barrier sheet, 300 ... Internal / external fixing part, EX ... Large stretch part, F ... Front body, B ... Back body.

Claims (3)

The exterior sheet constituting the front body and the back body, the interior body including the absorbent body provided at the center in the width direction of the inner surface of the exterior sheet from the front body to the back body, and the exterior sheet and the interior body are fixed. With internal and external fixing parts,
By joining both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body, a waist opening and a pair of left and right leg openings are formed,
An elongate fit fixed in a stretched state along the width direction on both the left and right sides of the interior body in the longitudinal range having the interior body in at least one of the front body and the back body, excluding the central portion in the width direction of the interior body In a pants-type disposable diaper where a plurality of elastic elastic members are provided at intervals in the vertical direction,
In the body having the fit elastic elastic member, in the longitudinal range having the fit elastic elastic member, the width of the inner / outer fixing portion is narrower than both the front and rear sides, and the widthwise center from the side edge of the inner / outer fixing portion having a narrow width A large stretchable part is provided on the side and in the width direction outside where the fit elastic stretchable member extends to a range of 30 mm .
In the longitudinal range having the fit elastic stretch member, the fit elastic stretch member is also provided before and after the large stretch portion, and the width direction center side of the fit elastic stretch member located before and after the large stretch portion Is located on the outer side in the width direction than the end on the center side in the width direction of the fit elastic elastic member located in the large elastic part ,
A pants-type disposable diaper characterized by that.   The large stretchable part is provided at least in the longitudinal range corresponding to the top of the buttocks in the back body, and the width of the inside / outside fixed part on both the front and back sides of the large stretchable part in the back body is the inside / outside fixed part of the large stretchable part. The underpants type disposable diaper of Claim 1 wider than the width | variety. In the longitudinal range having the fit elastic stretch member, the fit elastic stretch member is provided on both the front and rear sides of the large stretch portion, and the fit elastic stretch member located on the large stretch portion is the large stretch portion. The underpants type disposable diaper of Claim 1 or 2 currently fixed in the state extended | stretched in the width direction with the extension rate lower than the fitting elastic elastic member located in both front and back sides.

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