JP2012065818A - Underpants type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underpants type disposable diaper which fits well on the thigh roots and nonetheless follows movement of the thighs well and has excellent fitting feeling on the thigh roots.SOLUTION: The underpants type disposable diaper is characterized in that: ends, at leg opening parts LO side, of rear side attaching sites 81s that are attaching sites of a leg root resilient elastic member 81 at both side parts 12A of a back body B are positioned near leg opening parts LO of both side parts 12A of the back body B; ends, at leg opening parts LO sides, of front side attaching sites 80s that are attaching sites of a leg root resilient elastic member 80 at both side parts 12A of a front body F are positioned to a waist opening part WO side than ends, at the leg opening parts LO sides, of a rear side part attaching sites 81s; and an easily deformable area 85 without leg root part resilient elastic member 80 is formed between the leg root part attaching resilient elastic member 80 and the leg opening part LO in the front body F.

Description

  The present invention relates to a pants-type disposable diaper that fits well to the root of the thigh and has good followability to the movement of the thigh and is excellent in wearing feeling.

  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 pants-type disposable diapers, various elastic elastic members are fixed to the exterior sheet in an expanded state in order to improve the fit to the body, and in particular, the width at the edge of the waist opening. In addition to the waist edge elastic elastic member along the direction, and the waist lower elastic elastic member and the intermediate elastic elastic member along the width direction on the crotch side than the waist edge elastic elastic member, the leg opening in the front body and the back body The one having a leg base elastic member that is curved so as to be curved (represented in Patent Document 1) has a relatively high fit to the body.
However, in this conventional example, the leg elastic base members are arranged so as to continue in an annular shape along the edge of the leg opening, so that the legs are bent to the ventral side during walking or sitting. Or when crossed, the contraction force of the leg base elastic elastic member provided at the edge of the leg opening in the front body becomes resistance, obstructing the movement of the thigh, There is a problem that the feeling of pressure increases locally.
On the other hand, if the leg-base elastic elastic members are reduced, omitted, or weakened, there is a risk of impairing the fit to the thigh root.

JP 2000-140021 A

  Therefore, the main problem of the present invention is to provide a pants-type disposable diaper that fits well to the thigh root, has good followability to the thigh movement, and has a good wearing feeling at the thigh root. It is in.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An exterior sheet constituting the front body and the back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, including both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body Are joined to form a waist opening and a pair of left and right leg openings,
In the exterior sheet, leg elastic base elastic members extending along the leg openings so as to go to the opposite body side from the both sides of the front body and the back body respectively extend In a pants-type disposable diaper, fixed in a stretched direction,
The back side attachment part, which is the attachment part of the leg base elastic elastic member on both sides of the back body, is located at the leg opening side end in the vicinity of the leg opening on both sides of the back body,
The front side attachment part, which is the attachment part of the leg base elastic elastic member on both sides of the front body, has a leg opening side end closer to the waist opening side than the leg opening side end of the rear side attachment part. Located
An easily deformable region having no leg-based elastic elastic member is formed between the leg-based elastic elastic member and the leg opening in the front body.
A pants-type disposable diaper characterized by that.

(Function and effect)
In this way, the leg opening side end of the front side attachment portion of the leg base elastic elastic member is positioned closer to the waist opening side than the leg opening side end of the rear side attachment portion, By securing an easily deformable area that does not have leg elastic elastic members with legs between the leg elastic elastic members and leg openings, the legs can be bent to the ventral side when walking or sitting, etc. When assembled, the contraction force of the leg elastic elastic member at the edge of the leg opening in the front body is difficult to resist, obstructing thigh movement, and locally tightening (feeling of pressure) increases It becomes difficult to do. In addition, even if the end of the leg opening side of the front side attachment site is positioned closer to the waist opening side than the end of the leg opening side of the rear side attachment site, the side of the buttock of the body is Since it is located on the waist side from the side of the groin, the elastic base member with the leg base of the front body fits the heel part and the elastic base member with the leg base part of the back body fits the side part of the groin appropriately As a result, the leg elastic elastic member is fitted to a more appropriate part rather than simply being annularly continued along the edge of the leg opening as in the conventional case. be able to.

<Invention of Claim 2>
The pants according to claim 1, wherein the leg opening side end of the front side attachment part is located at the same longitudinal position as the waist opening side end of the rear side part attachment part or closer to the waist opening side. Type disposable diapers.

(Function and effect)
In the present invention, the front side attachment part and the rear side attachment part may partially overlap in the vertical direction, but if the form does not overlap as described in this section, a large easily deformable region is secured. It becomes easy, and it becomes possible to arrange the leg-attached base elastic elastic member at a more appropriate position with respect to both the heel portion and the heel groove.

<Invention of Claim 3>
In each of the exterior sheet in the front body and the exterior sheet in the back body, a plurality of elongated waist edge elastic elastic members extending along the width direction are spaced apart in the longitudinal direction at the edge of the waist opening. Each of which is fixed in a state of being stretched at a predetermined elongation rate along the width direction, and is elongated in the region in the front-rear direction center portion side than the waist edge elastic elastic member along the width direction. The waist lower elastic elastic members are fixed in a state where a plurality of waist elastic elastic members are stretched at a predetermined elongation rate along the width direction at intervals in the longitudinal direction,
The pants-type disposable diaper according to claim 2, wherein at least a part of the waist lower elastic elastic member of the front body has a portion attached in the easily deformable region.

(Function and effect)
By setting it as such a structure, it becomes difficult to open an easily deformable area | region using the waist lower elastic elastic member of the front body. Also, the waist lower elastic elastic member of the front body is different from the leg elastic elastic member with the leg, and the contraction force is mainly along the width direction, so that the contraction force inhibits the movement of the thigh, Almost no tightening (compression) is locally increased.

<Invention of Claim 4>
The exterior sheet is formed by laminating a plurality of non-woven fabrics with an adhesive in at least the waist edge elastic elastic member, the waist lower elastic elastic member, and the legged elastic elastic member. An edge elastic elastic member, a waist lower elastic elastic member, and a leg base elastic elastic member are sandwiched and fixed,
The basis weight of each nonwoven fabric constituting the exterior sheet is 10 to 40 g / m ² ,
The waist edge elastic elastic members in the front body and the back body have a thickness of 155 to 1880 dtex, a number of 3 to 22, a distance of 4 to 12 mmmm, and an elongation rate of 150 to 400% when fixed,
The waist lower part elastic elastic members in the front body and the back body have a thickness of 155 to 1880 dtex, a number of 5 to 30, a spacing of 1 to 15 mm, and an elongation rate of 200 to 350% when fixed,
The leg base elastic elastic member has a thickness of 100 to 2000 dtex, a number of 1 to 20, a distance of 1 to 30 mm, and an elongation rate of 100 to 300% when fixed.
The pants-type disposable diaper according to claim 3.

(Function and effect)
<Invention of Claim 5>
In the back body, the waist lower elastic elastic members are provided on both the left and right sides of the central portion in the width direction to form a contraction force action region, and the waist lower elastic extension members are between the contraction force action regions. A non-shrinking force non-acting region is formed, and both side edges of the shrinking force non-working region are located on the crotch side of the portion that curves along the side edge on the outer side in the width direction of both hips. The underpants type disposable diaper of Claim 3 or 4 which has a part which goes to the width direction outer side as it goes to the crotch side.

(Function and effect)
In this way, by ensuring that the shape of the region where the contractile force does not act on the back body is large enough to match the swelling of the buttocks surface, the legs can be bent to the ventral side or the cross seated when walking or sitting Even if the buttock swells relatively, the contraction force in the width direction of the back body is difficult to become resistance, the movement of the thigh is hindered, and the tightening (feeling of pressure) on the buttock locally increases. It becomes difficult to occur.

  As described above, according to the present invention, there are advantages such as good fit to the thigh root, good followability to thigh movement, and excellent wearing feeling at the thigh root. Brought about.

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

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 (back surface) of the product, and an interior body 200 that is attached to the inner surface of the exterior sheet. 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 dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive. The “front-rear direction” means the direction connecting the ventral side (front side) and the back side (rear side), “width direction” means the direction (left-right direction) orthogonal to the front-rear direction, and “up-down direction "In the state of wearing the diaper 100, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch 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 made into the state which carried out. The intermediate sheet 40 can be omitted.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{10~80g / m 2, 20~60g / 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 the extended portion is suitably about 5 to 20 mm on the left and right.

  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 spunbond nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water-repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 200 to 1240 dtex, more preferably 315 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 200 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 spraying density (amount) and women can increase the center spraying 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 15 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. 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 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, the basis weight 10 to 40 g / m ² approximately, particularly preferably in the 15-25 g / m ² approximately.

Moreover, it is preferable that the total basis weight of the exterior sheet 12 is about ²⁰ to 80 g / m ² so that the design of the print sheet 25 to be described later can be satisfactorily visually recognized through the exterior sheet 12. The total light transmittance specified in 7105 is preferably 40% or more, particularly 50% or more.

  And in order to improve the fitting property with respect to the body surface, the outer sheet 12 is provided with elongated elastic elastic members 15-19, 80, 81 such as rubber thread at a predetermined elongation rate between the two sheet base materials 12S, 12H. It has been. As the elongated elastic elastic members 15 to 19, 80, 81, synthetic rubber or natural rubber may be used. For bonding the two sheet base materials 12S and 12H of the outer sheet 12 and fixing the elongated elastic members 15 to 19, 80 and 81 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic waves by various coating methods is used. Adhesion can be used. 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, 80, 81 are firmly bonded, and other portions are not bonded or are 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 elastic waist member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, equivalent in the case of natural rubber. Specifically, the cross-sectional area is 0.05 to 1.5 mm ^2. , Especially about 0.1 to 1.0 mm ² ) is fixed at intervals of 4 to 12 mm at about 3 to 22 stretches of 150 to 400%, particularly about 220 to 320%, respectively. Is preferred. 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 elongated elastic elastic members 15 and 19 are vertically spaced along the width direction at a predetermined elongation rate so as to be continuous over the entire width direction at each of the upper and both sides in the width direction. It is fixed in the stretched state.

The elongated elastic elastic members 15 and 19 at the waist lower portion U have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, equivalent in the case of natural rubber. About 0.5 to 1.5 mm ² , particularly about 0.1 to 1.0 mm ² ), and about 5 to 30 thread rubbers with an interval of 1 to 15 mm, particularly 3 to 8 mm, and an elongation ratio of 200 to 350%, respectively. In particular, it is preferable to fix at 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 elongated elastic elastic members 16 and 18 are extended along the width direction at a predetermined extension rate at intervals in the vertical direction 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 slender elastic elastic members 16 and 18 of the intermediate portion L have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber, equivalent in the case of natural rubber. About 0.5 to 1.5 mm ² , especially about 0.1 to 1.0 mm ² ), about 2 to 10 thread rubbers at intervals of 5 to 40 mm, particularly 5 to 20 mm, and elongation rates of 150 to 300%, respectively. In particular, it is preferably fixed at 180 to 260%.

  Furthermore, between the outer side surface of the inner sheet base 12H and the inner side surface of the outer sheet base 12S in each of the front body F and the rear body B, the head is directed toward the opposite body while facing the center in the width direction. The leg-attached base elastic elastic members 80 and 81 extending along the leg opening LO are fixed in a state of being extended in the extending direction. In the illustrated embodiment, the crotch side ends of the leg elastic base members 80 and 81 extend to a position where the direction changes from the direction along the leg opening LO to the width direction and overlaps the side edge of the interior body 200. However, there is no need to change the direction. There may be a single leg elastic base member 80, 81, but it is preferable that there are a plurality of leg elastic base members 80, 81. In the example shown in the figure, there are three elongated elastic members, and the leg bases at each leg opening LO. The elastic elastic members 80 and 81 are arranged at intervals without crossing each other. As described above, the leg-base elastic elastic members 80 and 81 are not substantially arranged as a bundle of about a few elastic elastic members with a close interval, but form a predetermined elastic zone. As described above, it is preferable to arrange a plurality of them at predetermined intervals. More specifically, the leg elastic base members 80 and 81 have a thickness of 100 to 2000 dtex, more preferably 300 to 1000 dtex, a number of 1 to 20, more preferably 3 to 10, and a distance of 1 to 30 mm. More preferably, it is 5 to 15 mm, and the elongation ratio at the time of fixing is 100 to 300%, more preferably 150 to 250%.

  The rear side attachment part 81s, which is the attachment part of the leg base elastic member 81 in the side seal part 12A of the back body B, is an end on the leg opening LO side (in the case of one leg base elastic elastic member 81). The attachment position (hereinafter, the same applies to the front side attachment part 80s) is located in the vicinity of the leg opening LO of the side seal part 12A of the rear body B. The end of the rear side attachment portion 81s on the side of the waist opening WO is not particularly limited as long as it is within the range of the waistline T, but is preferably located at the lower waist U, and in particular, the longitudinal direction of the lower waist U. It is preferable that it is located on the leg opening LO side from the center.

  On the other hand, as shown in detail in FIGS. 8 and 9, the front side attachment portion 80 s, which is the attachment portion of the leg elastic base member 80 in the side seal portion 12 </ b> A of the front body F, is an end on the leg opening LO side. Is located on the waist opening WO side from the leg opening LO side end of the rear side attachment site 81s, and between the leg elastic base member 80 and the leg opening LO in the front body F, An easily deformable region 85 that does not have the root elastic member 80 is formed. The end on the waist opening WO side of the front side attachment part 80s is not particularly limited as long as it is within the range of the waist lower part U and the waist edge part W, but the part on the waist edge W side and the waist edge part of the waist lower part U It is preferably located at W.

  In this way, the leg opening LO side end of the front side attachment site 80s is positioned closer to the waist opening WO than the end of the rear side attachment site 81s on the leg opening LO side, and the leg in the front body F By securing an easily deformable region 85 that does not have the leg base elastic member 80 between the root elastic member 80 and the leg opening LO, the leg can be bent to the ventral side during walking, sitting, etc. When the crossed legs are assembled, the contraction force of the leg elastic elastic member 80 at the edge of the leg opening LO in the front body F is difficult to resist, the movement of the thigh is hindered, and the heel is tightened (compressed feeling) ) Is difficult to increase locally. Further, even if the end of the front side attachment site 80s on the leg opening LO side is positioned closer to the waist opening WO than the end of the rear side attachment site 81s on the leg opening LO side in this way, Since the side part of the part is located on the waist side of the side part of the heel groove, the leg base elastic elastic member 80 of the front body F is on the heel part and the leg base elastic elastic member 81 of the back body B is heel part Each of the grooves fits properly and the fit to the thigh root is not impaired, and the leg base elastic elastic members 80 and 81 are simply annularly continued along the edge of the leg opening LO as in the prior art. Rather, it can be fitted to a more appropriate site.

  The front side attachment part 80s and the rear side part attachment part 81s may partially overlap in the vertical direction. However, as shown in the illustrated example, the end of the side part attachment part on the leg opening LO side is the rear side. It is preferable that it is located at the same vertical position as the end of the waist opening WO side of the part attachment site 81s or more on the side of the waist opening WO, and particularly the end of the front side attachment site 80s on the leg opening LO side. Is located on the waist opening WO side from the longitudinal center of the waistline T, and the end of the rear side attachment part 81s on the waist opening WO side is a leg opening than the longitudinal center of the waistline T It is preferably located on the LO side. By adopting such an arrangement, the easily deformable region 85 can be easily secured, and the legged elastic base members 80 and 81 can be arranged at a more appropriate position with respect to both the heel part and the groin groove. become.

  In addition, as shown in the figure, easy deformation of the waist lower elastic elastic member 19 and the middle elastic elastic member 18 of the front body F (only the waist lower elastic elastic member 19 when the intermediate elastic elastic member 18 is not provided). Those located in the same longitudinal range as the region 85 have the waist lower elastic elastic member 18 and the middle elastic elastic member 18 of the front body F when all or a portion on the outer side in the width direction is attached in the easily deformable region 85. This is preferable because the easily deformable region 85 is difficult to open. In this case, the waist lower elastic elastic member 19 and the middle elastic elastic member 18 of the front body F are different from the leg-based elastic elastic member 80 in the leg part, and the contracting force is mainly along the width direction. It hardly occurs that the movement of the thigh is obstructed or the tightening (feeling of pressure) on the buttocks is locally increased.

  On the other hand, as shown in the drawing, the waist lower elastic elastic members 15 and 19, the intermediate elastic elastic members 16 and 18, and the legged elastic elastic members 80 and 81 have their widths except for the central portion in the width direction where they overlap the interior body 200. If it is respectively provided on both sides in the direction, the interior body 200 will not shrink more than necessary in the width direction, and it will not look bad or absorb well. In this configuration, the waist lower elastic elastic members 15 and 19, the intermediate elastic elastic members 16 and 18, and the legged elastic elastic members 80 and 81 exist only on both sides in the width direction, as well as across the interior body 200. The waist lower elastic elastic members 15, 19, the intermediate elastic elastic members 16, 18 and the legged elastic elastic members 80, 81 exist from one side to the other side in the width direction, but overlap with the interior body 200. At the center, the waist lower elastic elastic members 15 and 19, the intermediate elastic elastic members 16 and 18, and the leg elastic elastic members 80 and 81 are finely cut and no contraction force acts (substantially elastic elastic members). In other words, a configuration in which only both sides in the width direction are configured as contraction force acting portions is also included. Of course, the arrangement of the waist lower elastic members 15 and 19, the middle elastic members 16 and 18, and the legged elastic members 80 and 81 is not limited to the above example, and the entire inner body 200 contracts in the width direction. A part or all of the waist lower elastic elastic members 15, 19, the intermediate elastic elastic members 16, 18, and the leg base elastic elastic members 80, 81 cross the interior body 200 in the width direction so that force acts. It can also be provided continuously from one side to the other side.

  In particular, the waist lower elastic elastic member 19 and the middle elastic elastic member 18 of the front body F are provided on both the left and right sides of the central portion in the width direction of the rear body B (if the intermediate elastic elastic member 18 is not provided, the waist lower elastic elastic member 18 is provided. 19) is provided to form the contraction force action region, and the contraction force non-action region 88 is formed without providing the waist lower elastic elastic member at the center in the width direction, as shown in FIG. A shape having both side edges of the action area 88 along the side edges on the outer side in the width direction of both flanges, and a part 88L that is located on the crotch side and goes outward in the width direction toward the crotch side It is preferable to do this. In this way, by ensuring a large shape of the non-contraction force acting region 88 in the back body B in accordance with the swelling of the buttocks surface, the leg is bent to the ventral side or a cross-leg is formed when walking or sitting. Thus, even if the buttock swells relatively, the contraction force in the width direction of the back body B is unlikely to become resistance, the movement of the thigh is hindered, or the tightening (feeling of pressure) on the buttock locally increases. Such a situation is less likely to occur.

(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. 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.

  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 DESCRIPTION OF SYMBOLS ... Packaging sheet, 60 ... Side barrier cuff, 62 ... Barrier sheet, 80, 81 ... Leg elastic base elastic part, 80s ... Front side attachment part, 81s ... Rear side attachment part, 85 ... Easy deformation area.

Claims (5)

An exterior sheet constituting the front body and the back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, including both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body Are joined to form a waist opening and a pair of left and right leg openings,
In the exterior sheet, leg elastic base elastic members extending along the leg openings so as to go to the opposite body side from the both sides of the front body and the back body respectively extend In a pants-type disposable diaper, fixed in a stretched direction,
The back side attachment part, which is the attachment part of the leg base elastic elastic member on both sides of the back body, is located at the leg opening side end in the vicinity of the leg opening on both sides of the back body,
The front side attachment part, which is the attachment part of the leg base elastic elastic member on both sides of the front body, has a leg opening side end closer to the waist opening side than the leg opening side end of the rear side attachment part. Located
An easily deformable region having no leg-based elastic elastic member is formed between the leg-based elastic elastic member and the leg opening in the front body.
A pants-type disposable diaper characterized by that.   The pants according to claim 1, wherein the leg opening side end of the front side attachment part is located at the same longitudinal position as the waist opening side end of the rear side part attachment part or closer to the waist opening side. Type disposable diapers. In each of the exterior sheet in the front body and the exterior sheet in the back body, a plurality of elongated waist edge elastic elastic members extending along the width direction are spaced apart in the longitudinal direction at the edge of the waist opening. Each of which is fixed in a state of being stretched at a predetermined elongation rate along the width direction, and is elongated in the region in the front-rear direction center portion side than the waist edge elastic elastic member along the width direction. The waist lower elastic elastic members are fixed in a state where a plurality of waist elastic elastic members are stretched at a predetermined elongation rate along the width direction at intervals in the longitudinal direction,
The pants-type disposable diaper according to claim 2, wherein at least a part of the waist lower elastic elastic member of the front body has a portion attached in the easily deformable region. The exterior sheet is formed by laminating a plurality of non-woven fabrics with an adhesive in at least the waist edge elastic elastic member, the waist lower elastic elastic member, and the legged elastic elastic member. An edge elastic elastic member, a waist lower elastic elastic member, and a leg base elastic elastic member are sandwiched and fixed,
The basis weight of each nonwoven fabric constituting the exterior sheet is 10 to 40 g / m ² ,
The waist edge elastic elastic members in the front body and the back body have a thickness of 155 to 1880 dtex, a number of 3 to 22, a distance of 4 to 12 mmmm, and an elongation rate of 150 to 400% when fixed,
The waist lower part elastic elastic members in the front body and the back body have a thickness of 155 to 1880 dtex, a number of 5 to 30, a spacing of 1 to 15 mm, and an elongation rate of 200 to 350% when fixed,
The leg base elastic elastic member has a thickness of 100 to 2000 dtex, a number of 1 to 20, a distance of 1 to 30 mm, and an elongation rate of 100 to 300% when fixed.
The pants-type disposable diaper according to claim 3.   In the back body, the waist lower elastic elastic members are provided on both the left and right sides of the central portion in the width direction to form a contraction force action region, and the waist lower elastic extension members are between the contraction force action regions. A non-shrinking force non-acting region is formed, and both side edges of the shrinking force non-working region are located on the crotch side of the portion that curves along the side edge on the outer side in the width direction of both hips. The underpants type disposable diaper of Claim 3 or 4 which has a part which goes to the width direction outer side as it goes to the crotch side.

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