JP2016067880A - Underpants type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underpants type disposable diaper, which does not cause eruption and mark of the diaper on a skin of a wearer, and can prevent slip-down.SOLUTION: A vertical direction area T having a side seal part 12A of at least one external body 12 of a front body F and a back body B, is configured to be extended and shrunk elastically in a width direction, and an opening 300 for preventing deviation, is provided on a crista iliaca contacting area which contacts a crista iliaca of a wearer on the vertical direction area T.SELECTED DRAWING: Figure 9

Description

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

  In the pants-type disposable diaper, an elastic elastic material is used around the waist (waist) in order to fit the body shape of the wearer. Examples of the elastic stretchable material include elastic stretchable members such as rubber thread, and non-woven fabrics and films having elastic stretchability.

  However, the wearer of a diaper may have an enlarged stomach, and in particular, a child or the like often moves around without worrying about a diaper slipping or the like while the stomach is inflated. Therefore, even if an elastic elastic material is used around the waist, when the wearer moves around or excretes, the stomach side of the diaper may slide down. If this slip-off is left unattended, the entire diaper slips, which not only looks bad, but also causes leakage.

  In this regard, in order to prevent slipping off, it may be possible to increase the elasticity of the elastic elastic material around the waist, but if the elastic elasticity of the elastic elastic material is increased, the skin of the wearer may be marked or rashed. Cause. In this regard, regarding rashes, proposals have been made to prevent stuffiness by forming vents by notching both sides of an exterior body (exterior sheet) that forms the front body and the back of the body (for example, patent documents) 1, see Patent Document 2). However, if the elasticity of the elastic elastic material around the waist is strengthened in order to prevent slipping off, the air permeability is not improved so much and it is not possible to prevent the marking.

JP 2006-314771 A JP 2012-232102 A

  Then, the main subject of this invention is providing the underpants type disposable diaper which can prevent a slipping-down without producing a mark, a rash, etc. on a wearer's skin.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The side seal part is formed by joining the both sides of the outer body that forms the front body extending from the crotch to the ventral side and the both sides of the outer body that forms the back body extending from the crotch to the back side. A pants-type disposable diaper in which a waist opening for passing a wearer's torso and a pair of left and right leg openings for passing a leg are formed, and an interior body including an absorbent body is provided inside the exterior body Because
The longitudinal region having the side seal portion of at least one of the exterior body forming the front body and the exterior body forming the back body is configured to elastically expand and contract in the width direction,
And, in the iliac crest abutment region that is in the longitudinal region and abuts on the wearer's iliac crest region, a slip stopper opening is provided,
A pants-type disposable diaper characterized by that.

(Function and effect)
A longitudinal region having a side seal portion of at least one of the exterior body forming the front body and the exterior body forming the back body is configured to elastically expand and contract in the width direction, and the longitudinal region If the iliac crest abutment region that abuts the wearer's iliac crest region is provided with a misalignment opening, the wearer's iliac crest region fits into the misalignment opening and the misalignment is prevented. The exterior body on the waist opening side from the opening is caught on the iliac crest region of the wearer. That is, for example, when the pants are put on and the belt is fastened, the portion of the pants that is fastened with the belt is caught on the wearer's iliac crest region and the pants are not slipped off. Therefore, it is possible to prevent the diaper from slipping down without increasing the elastic stretching force in the longitudinal region.

<Invention of Claim 2>
The tensile force at the time of elastic deformation in the width direction of the outer body forming the front body is 3.0 to 16.0 N,
And the vertical direction length of the shift stop opening is 20 to 80 mm,
The pants-type disposable diaper according to claim 1.

(Function and effect)
When the tensile force in the elastic deformation in the width direction of the outer body forming the front body is 3.0 to 16.0 N and the longitudinal length of the anti-displacement opening is 20 to 80 mm, the elastic stretching force Can be surely prevented from falling off the diaper while keeping the range of the wearer's skin without causing marks or rashes.

<Invention of Claim 3>
A cutout is formed in the outer body that forms the front body, and the cutout is the misalignment opening.
The underpants type disposable diaper of Claim 1 or Claim 2.

(Function and effect)
A pants-type disposable diaper in which a cutout is formed in the outer body that forms the front body, and the cutout is used as an opening for preventing slippage can be obtained without changing the manufacturing process of the side seal part while having the above-described effects. it can.

<Invention of Claim 4>
The misalignment opening is an elongated shape having a longitudinal direction and a width direction,
The crotch side is a shape inclined to the abdomen and the waist side to the back,
The pants-type disposable diaper according to claim 3.
(Function and effect)
If the slip stopper opening has an elongated shape having a longitudinal direction and a width direction, the crotch portion side is inclined to the abdomen side, and the waist side is inclined to the back side, the sliding of the diaper can be more reliably prevented.

<Invention of Claim 5>
A notch extending from both sides toward the center in the width direction is formed in the outer body that forms the front body, and the notch serves as the misalignment opening.
The underpants type disposable diaper of Claim 1 or Claim 2.

(Function and effect)
A pants-type disposable diaper in which a cutout extending from both sides toward the center in the width direction is formed in the outer body that forms the front body, and the cutout is a misalignment opening, while having the above-described effects It can be obtained without changing the manufacturing process of the side seal portion.

<Invention of Claim 6>
In the vertical region having the side seal portion of the exterior body, (the width of the exterior body forming the front body) <(the width of the exterior body forming the back body),
And, in the side seal part, at least a part of the vertical direction is a relatively weak joining force than other areas, or a non-joining detachment part,
When the disengagement part at the time of opening is configured to be the misalignment opening,
The underpants type disposable diaper of Claim 1 or Claim 2.

(Function and effect)
In the vertical region having the side seal portion of the exterior body, when (the width of the exterior body forming the front body) <(the width of the exterior body forming the back body), the side seal portion is attached to the front body when mounted. Located on the ventral side. Therefore, in the side seal portion, at least a part of the vertical direction is a weaker joining force than the other regions, or a non-joined detachment portion, and the detachment portion when the attachment is performed. If it is configured to be a misalignment opening when it is opened, the above-described effects can be obtained only by changing the joining method of the side seal part without providing a new manufacturing process such as a cutting process or a notch process. be able to.

<Invention of Claim 7>
In the longitudinal region having the side seal portion of the exterior body, (the tensile force during elastic deformation of the exterior body forming the front body)> (tensile force during elastic deformation of the exterior body forming the back body),
And, in the side seal part, at least a part of the vertical direction is a relatively weak joining force than other areas, or a non-joining detachment part,
When the disengagement part at the time of opening is configured to be the misalignment opening,
The underpants type disposable diaper of Claim 1 or Claim 2.

(Function and effect)
In the longitudinal region having the side seal portion of the exterior body, (the tensile force during elastic deformation of the exterior body that forms the front body)> (tensile force during elastic deformation of the exterior body that forms the back body) At the time of wearing, the side seal part is located on the front body (ventral side). Therefore, in the side seal portion, at least a part of the vertical direction is a weaker joining force than the other regions, or a non-joined detachment portion, and the detachment portion when the attachment is performed. If it is configured to be a misalignment opening when it is opened, the above-described effects can be obtained only by changing the joining method of the side seal part without providing a new manufacturing process such as a cutting process or a notch process. be able to.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes a pants type disposable diaper which can prevent a slipping-down without producing a mark, a rash, etc. on a wearer's skin.

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 explanatory drawing of a cut-out type underpants type disposable diaper. It is explanatory drawing of a notch type underpants type disposable diaper. It is explanatory drawing of the underpants type disposable diaper of a side seal part utilization type. It is form example (1) (2) and arrangement | positioning explanatory drawing (3) of a shift stop opening part. It is rocking | fluctuation explanatory drawing of an elongate elastic expansion-contraction member. It is a figure which shows the shape of the shift stop opening part which concerns on Example 1, and the rocking | fluctuation shape of an elongate elastic expansion-contraction member. It is a figure which shows the shape of the slip prevention opening part which concerns on Example 2, and the rocking | fluctuation shape of an elongate elastic expansion-contraction member. It is a figure which shows the shape of the slip prevention opening part concerning Example 3, and the rocking | fluctuation shape of an elongate elastic expansion-contraction member. It is a figure which shows the shape of the slip prevention opening part concerning Example 4, and the rocking | fluctuation shape of an elongate elastic expansion-contraction member. It is a figure which shows the shape of the shift stop opening part concerning Example 5, and the rocking | fluctuation shape of an elongate elastic expansion-contraction member. It is the photograph of the left side surface of the underpants type disposable diaper which concerns on Example 1, and a front. It is the photograph of the left side surface of the underpants type disposable diaper which concerns on Example 2, and a front. It is the photograph of the left side surface of the underpants type disposable diaper which concerns on Example 3, and a front. It is the photograph of the left side surface of the underpants type disposable diaper which concerns on Example 4, and a front. It is the photograph of the left side surface of the underpants type disposable diaper which concerns on Example 5, and a front.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The pants-type disposable diaper according to the present embodiment is a longitudinal region (T) having a side seal portion of at least one of the outer body constituting the front body and the outer body constituting the rear body, and the intestine of the wearer The iliac crest abutment region that abuts the bone crest region is provided with a later-described misalignment opening (indicated by reference numeral 300 or the like). When the misalignment opening is provided, the wearer's iliac crest region fits into the misalignment opening, and the exterior body (12) on the waist opening (WO) side from the misalignment opening is the intestine of the wearer. It gets caught in the bone crest region. Therefore, it is possible to prevent the diaper from slipping down without increasing the elastic expansion and contraction force in the longitudinal region (T) of the exterior body, and to prevent urine leakage and the like caused by the slipping off. Moreover, since it is not necessary to strengthen the elastic expansion-contraction force in the vertical direction area | region (T) of an exterior body, the function as a vent hole can also be anticipated in a slip prevention opening part.

  The misalignment opening can be provided by forming “cutout” or “notch” in the exterior body, or by forming a part of the side seal portion as a detachment portion during mounting. Therefore, in the following, in order to clarify the advantages, differences, and the like of these forms, elements common to all the forms will be described first, and then elements that are features of various forms will be described.

<Basic explanation>
1 to 8 show an example 100 of a pants-type disposable diaper. In addition, in these figures, in order to make each element easy to recognize, the slip stopper opening is omitted, but the pants-type disposable diaper of this embodiment has a slip stopper opening to be described later.

  The pants-type disposable diaper 100 includes an exterior body 12 that forms the outer surface (back surface) of the product and an interior body 200 that is attached to the inner surface of the exterior body 12. Symbol Y indicates the total length of the diaper in the unfolded state (vertical length from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and symbol X indicates the total width of the diaper in the unfolded state. Is shown.

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

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorption element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function. Reference numeral 40 is also referred to as 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. In order to prevent excrement from leaking on both sides of the interior body 200, reference numeral 60 denotes a three-dimensional gather 60 that is provided on both sides of the interior body 200 and stands on the body side. Show.

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

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

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

(Intermediate sheet)
In order to make the liquid which permeate | transmitted the surface sheet 30 transfer to an absorber rapidly, the intermediate | middle sheet | seat 40 whose liquid permeation | transmission speed is faster than the surface sheet 30 can be provided. 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 (PE) 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 illustrated in FIG. 3 is arranged in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

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

  The liquid-impermeable sheet 11 has a width that fits on the back side of the absorbent element 50 as shown in the drawing, and in order to improve leakage prevention, the liquid-impermeable sheet 11 wraps around both sides of the absorbent element 50 and faces the side surface 30 of the absorbent element 50. It can also extend to both sides of the. The width of the extended portion is suitably 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 sheet 11, especially the absorber 56 side surface.

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

  More specifically, the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. A base end portion (an end portion on the side opposite to the sheet folding portion in the width direction) located on the opposite side to the front end portion of the three-dimensional gather 60 is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200. A portion other than the attachment portion 65 is a protruding portion 66 (a portion on the folded portion side) protruding from the attachment portion 65. The projecting portion 66 includes a base side portion that extends toward the center in the width direction, and a tip side portion that is folded back outward in the width direction from the tip of the base side portion. This form is a surface contact type three-dimensional gather, but a line contact type three-dimensional gather (not shown) that is not folded outward in the width direction can also be employed. And the fixing means by material welding, such as a hot-melt adhesive (alternatively or in combination with this, a heat seal or an ultrasonic seal) is applied to the side surface of the topsheet 30 with both ends in the front-rear direction of the protruding portion 66 lying down. The front-rear direction fixing portion 67 is fixed to the front-rear direction intermediate portion, and the front-rear direction intermediate portion located between them is the non-fixed free portion 68. The free portion 68 is elongated along the front-rear direction. The elastic member 63 is fixed in an extended state.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric 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 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%. Further, as shown in the drawing, a waterproof film 64 can be interposed between the gather sheets folded in two.

  2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, and the absorbent element 50 in the interior body 200.

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

  The dimensions of the three-dimensional gather 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 7, the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. Moreover, it is preferable that the separation distance W3 between the folds located on the innermost side in a state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the topsheet 30 is 60 to 190 mm, particularly 70 to 140 mm.

  Note that, unlike the illustrated embodiment, the three-dimensional gathers can be provided in double (two rows) on the left and right sides of the interior body 200.

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

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and can be set to, for example, 30 to 120 g / m ^{2 in} the case of a filament aggregate. . 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 degree of crimp of the crimped fibers can be, for example, 5 to 75, preferably 10 to 50, and more preferably 15 to 50 per inch (2.54 cm). Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  The absorber 56 may have a rectangular shape, but, as illustrated in FIG. 1, an hourglass having a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion, located between them. The shape is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.

  Moreover, although the dimension of an absorber can be determined suitably, it is preferable to extend to the peripheral part of the interior body, or its vicinity in the front-back direction and the width direction. In addition, the code | symbol 56X of FIG.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The proportion of particles remaining on the top is preferably 30% by weight or less, and the proportion of particles remaining on the screen by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006) 60% by weight or more is desirable.

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

  As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption speed is too slow, the liquid supplied into the absorber 56 is likely to cause a so-called reverse return that returns to the outside of the absorber 56.

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

  The exterior body 12 includes a waist portion T defined as a longitudinal range (a longitudinal range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a longitudinal range ( An intermediate portion L defined by a vertical region having the side seal portion 12A of the front body F and a vertical region having the side seal portion 12A of the rear body B. The waistline portion T can be divided into a “waist edge portion” W that conceptually forms an edge portion of the waist opening and a “waist lower portion” U that is a lower portion than this. Usually, when there is a boundary (for example, the thickness or elongation rate of the elastic elastic member changes) in the waistline portion T, the waist opening WO side is closer to the waist edge than the waist opening WO side boundary. When there is no such boundary, the waist opening WO side becomes the waist edge W with respect to the absorbent body 56 or the interior body 200. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist edge W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put. As a result, the exterior body 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior body 12 can be determined as appropriate. In order to obtain a clean appearance as shown in FIGS. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

  As shown in FIGS. 3 to 5, the exterior body 12 is formed by bonding two sheet materials 12 </ b> S and 12 </ b> H with an adhesive such as a hot-melt adhesive, and is an inner sheet material positioned on the inner side. 12H extends only to the edge of the waist opening WO, but the outer sheet material 12S wraps around the edge on the waist side of the inner sheet material 12H and is folded inside thereof, and the folded portion 12r is the inner body 200. It extends so that it may cover even to the waist side edge part.

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

The total weight of the exterior body 12 is preferably 20 to 60 g / m ² , and the total light transmittance defined in JIS K 7105 of the exterior body 12 is 40% or more, particularly 50% or more. Is preferred.

  And in order to improve the fit with respect to the trunk periphery, or to implement “side seal part detachment type: second example” described later, the exterior body 12 is made of thread rubber or the like between the sheet materials 12S and 12H. The elongated elastic elastic members 15 to 19 are provided at a predetermined elongation rate. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the two sheet materials 12S and 12H of the outer package 12 and fixing the elongated elastic elastic members 15 to 19 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic bonding by various application methods may be used. it can. If the entire exterior body 12 is firmly fixed, the texture of the sheet is impaired, which is not preferable. By combining these, it is preferable that the elongated elastic elastic members 15 to 19 are firmly bonded, and other portions are not bonded or bonded weakly.

  In addition, instead of providing the elongated elastic elastic members 15 to 19 between the sheet materials 12S and 12H, or together with this, an elastic elastic material such as an elastic nonwoven fabric or an elastic film is used as the sheet materials 12S and 12H. You can also

As an example, between the inner side surface of the inner sheet material 12H and the outer surface of the folded portion 12r of the outer sheet material 12S at the waist edge W of the rear body B and the front body F, the entire width direction is continuous. The plurality of waist edge elastic elastic members 17 are fixed in a state where they are spaced apart in the vertical direction and stretched along the width direction at a predetermined stretch rate. In addition, one or a plurality of the waist edge elastic elastic members 17 disposed in the region adjacent to the waist lower part U may overlap with the interior body 200 or may overlap with the interior body 200. You may each provide in the width direction both sides except a direction center part. The waist edge elastic elastic member 17 has a thickness of 155 to 1880 dtex, especially 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). 1.0 mm ² ) is preferably fixed at 3 to 22 thread rubbers at intervals of 4 to 12 mm, with an elongation of 150 to 400%, particularly 220 to 320%. Further, the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .

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

The waist downward resilient and elastic members 15 and 19, the thickness 155～1880Dtex, especially 470～1240Dtex (the case of synthetic rubber. Cross-sectional area in the case of natural rubber 0.05 to 1.5 mm ^2, in particular 0.1 1.0 mm ^2. ) Is preferably fixed at 5 to 30 thread rubbers at intervals of 1 to 15 mm, particularly 3 to 8 mm, and stretch rates of 200 to 350%, particularly 240 to 300%, respectively.

  Further, the width between the outer side surface of the inner sheet material 12H and the inner side surface of the outer sheet material 12S in the intermediate portion L of the front body F and the rear body B, except for the widthwise central portion overlapping the interior body 200, is the width. A plurality of intermediate elastic elastic members 16 and 18 made of an elongated elastic elastic member, which are continuous in the entire width direction at each part on both sides in the direction, are spaced apart in the vertical direction and have a predetermined elongation rate. It is fixed in a stretched state along the direction.

The intermediate elastic elastic members 16 and 18 have a thickness of 155 to 1880 dtex, particularly 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). 2.0 mm ² ) is preferably fixed at an interval of 5 to 40 mm, particularly 5 to 20 mm, with an elongation of 150 to 300%, particularly 180 to 260%.

  As shown in the figure, the waist lower elastic member and the intermediate elastic members 15, 19, 16, and 18 are provided on both sides in the width direction except for a part or the whole of the portion overlapping the interior body 200, respectively. If this is the case, the interior body 200 will not shrink more than necessary in the width direction, so that it will not look bad or absorb well. 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. The elastic elastic member is finely cut in part or all of the part, 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 serve as the contraction force acting part. A configured form is also included. Of course, the arrangement of the elastic lower elastic member 15 and the elastic elastic members 15, 19, 16, 18 is not limited to the above example, and the elastic force acts on the entire width direction including the portion overlapping the interior body 200. As described above, part or all of the waist lower elastic elastic member and the intermediate elastic elastic members 15, 19, 16, and 18 can be provided across the interior body 200 from one side in the width direction to the other side.

  Moreover, when using the rubber | gum containing a titanium oxide as the elongate elastic expansion-contraction members 15-19, it is preferable to use a thing with a low content of titanium oxide (for example, 2% or less) or a thing containing no titanium oxide. .

(External body split structure)
In the above-described example, the front body F to the back body B are continuously covered by the integrated exterior body 12. However, the exterior body and the back side exterior body covering the stomach side of the wearer's torso and the back And the front end portion of the interior body is connected to the inner surface of the central portion in the width direction of the ventral side exterior body by a hot melt adhesive or the like, and the center in the width direction of the back side exterior body. The rear end part of the interior body is connected to the inner surface of the interior part by a hot melt adhesive or the like, and the abdominal side exterior body and the back side exterior body are not continuous on the crotch side, and a form in which they are separated is also adopted. Can do. This separation distance can be 150 to 250 mm. In this case, on the back surface of the liquid-impermeable sheet in the interior body, the crotch is formed so as to cover the entire back surface of the interior body or to cover the entire portion exposed between the abdominal exterior body and the back exterior body. The exterior body can also be fixed. As the crotch outer casing, the same materials as those used for the outer casing described above can be used. The crotch outer body also corresponds to the outer body of the present invention.

<Cutout type>
Next, an example of the form of the misalignment opening will be described.
The pants type disposable diaper 100 which belongs to a cut-out type | mold was shown to (1)-(3) of FIG. In the present diaper 100, a cutout is formed in the exterior body 12 formed by laminating the inner sheet material 12H and the outer sheet material 12S, and the cutout serves as a misalignment opening 300. The misalignment opening 300 is a longitudinal region having the side seal portion 12A of the exterior body 12 and is located in the iliac crest abutment region that abuts the wearer's iliac crest region. It is provided in the part T. The misalignment opening 300 is an opening into which the iliac crest region, which is referred to as the hip bone portion of the wearer, fits, and is a front body F of the outer body 12 so that a pair of lines is symmetrical with respect to the center line in the width direction. Is provided.

  In this embodiment, the wearer's iliac crest region fits into the misalignment opening 300 formed by cutting out, and the exterior body 12 on the waist opening WO side (usually the waist edge W) from the misalignment opening 300. Is caught in the wearer's iliac crest region. Therefore, it is possible to prevent the diaper from slipping down without increasing the elastic expansion and contraction force at the trunk periphery T of the outer body 12 that forms the front body F and the outer body 12 that forms the rear body B. Further, in this embodiment, the shape of the misalignment opening 300 can be easily changed, and the fit of the wearer to the iliac crest region can be improved by devising the shape of the misalignment opening 300. it can. Furthermore, in this embodiment, unlike the case of the “side seal portion utilization type” described later, the above-described effects can be obtained without changing the manufacturing process of the side seal portion 12A.

  In this embodiment, when an elongated elastic expansion / contraction member is used around the waist, the elongated elastic expansion / contraction member positioned at the front body of the slip stopper opening 300 is swung so as to avoid the slip stopper opening 300. Arrange. By oscillating and arranging the elongated elastic stretch member, the non-existing portion of the elongated elastic stretch member positioned on the front body side of the misalignment opening 300 can be eliminated, and the elastic stretch force is reduced. Can be prevented.

  1-15 mm is preferable and 5-10 mm is more preferable as the closest distance with the slip prevention opening part 300 of the elongate elastic expansion-contraction member to rock | fluctuate. The interval between the swinging elastic elastic members that swing is 1 to 20 mm, preferably 4 to 10 mm.

  The elongated elastic elastic member that swings may overlap the elastic elastic member.

  Here, in this embodiment, the tensile force at the time of elastic deformation of the exterior body 12 forming the front body F can be suppressed to, for example, 3.0 to 16.0 N, preferably 5.0 to 14.0 N. Similarly, the tensile force at the time of elastic deformation in the width direction of the exterior body 12 forming the back body B can be suppressed to, for example, 3.0 to 16.0 N, preferably 5.0 to 14.0 N. In this regard, when the tensile force in the elastic deformation in the width direction of the outer body 12 that forms the front body F or the afterglow B is less than 3.0 N, the iliac crest region is likely to be detached from the misalignment opening 300, and the diaper slips The drop prevention effect may be insufficient. Moreover, there exists a possibility that the fitting feeling of this diaper 100 may become inadequate. On the other hand, if the tensile force in the elastic deformation in the width direction of the outer body 12 that forms the front body F or the rearward appearance B exceeds 16.0 N, the wearer's skin may be marked or rashed. In this regard, for example, Japanese Patent Application Laid-Open No. 11-021702 proposes “provide an opening on which a finger can be hung to lift a diaper”, and Japanese Patent Application Laid-Open No. 2004-267335 discloses “Auxiliary”. A proposal has been made that "pants-type diapers are pulled up by hooking the fingertips of the hand into the opening". However, the displacement preventing opening 300 of the present embodiment is an opening into which the wearer's iliac crest region fits, and it is necessary to pay attention to the tensile force during elastic deformation from the viewpoint of fitting the iliac crest region. Therefore, it can be said that the tensile force at the time of elastic deformation is a study in a direction in which it is difficult for a finger to get stuck on the misalignment opening 300, and the above-mentioned prior application cannot be referred to.

  Each misalignment opening 300 can have a distance 300X from the front end in the front-rear direction of the exterior body 12 of, for example, 10 to 80 mm, preferably 20 to 50 mm, and more preferably 20 to 30 mm. Moreover, each misalignment opening 300 can make distance 300Y from the width direction side edge of the exterior body 12 into 5-80 mm, for example, Preferably it is 15-70 mm, More preferably, it can be 20-50 mm. Furthermore, each misalignment opening 300 can have a longitudinal length 300L of, for example, 20 to 80 mm, preferably 40 to 70 mm, and more preferably 50 to 60 mm. Each misalignment opening 300 can have a width 300W of, for example, 5 to 80 mm, preferably 10 to 60 mm, and more preferably 30 to 50 mm.

  Each misalignment opening 300 can have an appropriate shape so as to fit the iliac crest region, for example, a circular shape, a vertically long elliptical shape, a horizontally long elliptical shape, a rectangular shape, a vertically long rectangular shape, a horizontally long rectangular shape, arbitrary Or the like. Further, as shown in an enlarged view in (2) of FIG. 9, when the elongated elastic elastic members 17 and 19 provided on the exterior body 12 are oscillated and arranged in accordance with these shapes, This improves the fit, and prevents both the slip-off prevention effect and the fit.

  However, the shape, size and position of the misalignment opening 300 or the swinging (swinging shape) and arrangement of the elongated elastic elastic members 17 and 19 provided in the exterior body 12 are as follows. This is preferable.

  First, the shape of the misalignment opening 300 is an elongated shape having a longitudinal direction and a width direction, preferably an elliptical shape as shown in FIG. 12 (1), and the lower end side (groin side) is the front side (ventral side). F) and the upper end side (waist W side) is preferably inclined rearward (back side B). In this regard, the iliac crest region of the wearer generally has a shape in which the lower end side is inclined forward and the upper end side is inclined rearward when viewed from the side. Therefore, by making the shape of the misalignment opening 300 elliptical and inclined as described above, the wearer's iliac crest region can be more easily fitted, and the slip-off preventing effect can be achieved. Will improve.

  Moreover, when the exterior sheet 12 is pulled so as to have a length of 170% with respect to the length in the natural state (100%), the inclination angle α of the misalignment opening 300 is 50 to 85 °. It is preferable to design to 60 ° to 70 °. According to various investigations by the present inventors, the wearer's iliac crest region is normally inclined at an inclination angle of 50 to 85 °, and is intended to follow this inclination.

  Next, when the exterior sheet 12 is pulled so as to have a length of 170% with respect to the length in the natural state (100%), the length R1 in the longitudinal direction is the same as the size of the misalignment opening 300. The design is preferably 40 to 100 mm, and more preferably 50 to 70 mm. Moreover, when the exterior sheet 12 is pulled so as to have a length of 170% with respect to the length in the natural state (100%), the width direction length R2 is designed to be 20 to 70 mm. Preferably, it is more preferably designed to be 30 to 50 mm. If the size of the misalignment opening 300 is in the above range, it is suitable for many wearers in combination with the expansion and contraction of the exterior sheet 12.

  Furthermore, when the shape of the misalignment opening 300 can be designed in more detail, as shown in (2) of FIG. 12, the upper end side is higher than the lower end side (groin side), assuming the above inclination. It is preferable that the width (R2) of the misalignment opening 300 is expanded on the (waist W side). In more detail, it is preferable that the lower end side bulge angle β is designed to have a reverse raindrop shape (reverse egg shape) of 30 to 60 °, and the lower end side bulge angle β is 40 °. It is more preferable to design as follows. This shape is more in line with the shape of the wearer's iliac crest region, and the slip-off prevention effect is further improved.

  Here, the “reverse raindrop shape (reverse egg shape)” is not an elliptical shape in which the top and bottom are line-symmetrical, for example, a shape in which the egg is turned upside down or the raindrop is turned upside down. This is an elliptical shape in which the upper end side swells (expands) compared to the lower end side. In addition, this shape means the shape in the state which the exterior sheet | seat 12 extended completely.

  Further, the bulging angle β on the lower end side is as shown in (2) of FIG. 12 when the exterior sheet 12 is pulled to a length of 170% with respect to the length in the natural state (100%). The angle at the part where two tangent lines Ry that contact each other at the intermediate point Rx in the longitudinal direction of the misalignment opening 300 intersect. Further, the length R1 in the longitudinal direction and the length R2 in the width direction of the reverse raindrop-shaped misalignment opening 300 are the same as those of the above-described oval-shaped misalignment opening 300 ((1) in FIG. 12). Is preferred.

  Here, as shown in (3) of FIG. 12, the formation position of the misalignment opening 300 is preferably such that the length S1 from the upper end edge to the waist W is 20 to 80 mm, and 40 to 60 mm. More preferred. Moreover, it is preferable that length S2 from a back side edge to 12 A of side seal parts is 5-30 mm, and it is more preferable that it is 10-20 mm. According to various studies conducted by the present inventors, the wearer's iliac crest region is usually located 40 mm below the navel and 10 mm ventral from the outermost edge. Therefore, by setting the formation position within the above range, the effect of preventing slipping can be reliably obtained.

  Next, the swinging shape and arrangement of the elongated elastic elastic members 17 and 19 provided in the exterior body 12 around the misalignment opening 300 will be described.

  As shown in FIG. 13 (1), the elongated elastic elastic members 17, 19 are arranged to swing so as to avoid the misalignment opening 300. As described above, by oscillating the elongated elastic elastic members 17 and 19, it is possible to eliminate the non-existing portion of the elongated elastic elastic members 17 and 19, and to prevent a decrease in elastic elastic force. . As shown in (2) of FIG. 13, the swinging arrangement of the elongated elastic elastic members 17 and 19 is such that the arrangement positions of the elongated elastic elastic members 17 and 19 are divided into three areas Za, Zb and Zc. It is preferable that the elongate elastic members 17 and 19 are divided so as to swing along the respective regions Za, Zb, and Zc. According to this embodiment, not only the elastic expansion / contraction force of the exterior sheet 12 is balanced, but also the ease of manufacture is excellent.

Here, the regions Za, Zb, and Zc are more preferable as follows.
First, the region Za is located 10 to 40 mm above (the waist W side) from the upper end edge of the misalignment opening 300 on the back side B, and has a rocking angle γa of 45 to 85 ° and the peripheral edge of the misalignment opening 300. Along the lower side (groin part side), and reaches the abdominal side F.

  Next, the region Zb is located on the back side B below the region Za (the crotch portion side), and the swing angle γb is 30 to 60 °, and the upper side (waist W ) To the ventral side F.

  Finally, the region Zc is located on the back side B below the region Zb (in the crotch portion), preferably below the center point of the misalignment opening 300, and the swing angle γc is 15 to 45 °. Thus, it swings downward (in the crotch portion) along the periphery of the misalignment opening 300 and reaches the ventral side F.

  In addition, the description regarding the above rocking | swiveling does not mean that the starting point at the time of arrange | positioning the elongate elastic expansion-contraction members 17 and 19 is the back side B. FIG. The arrangement starting point may be the ventral side F or the simultaneous arrangement on the dorsal side B and F as long as the swing shape is as described above.

<Notch type>
The pants type disposable diaper 100 which belongs to a notch type | mold was shown to (1)-(3) of FIG. In the present diaper 100, a cutout is formed in the outer package 12 formed by laminating the inner sheet material 12H and the outer sheet material 12S, and the cutout serves as a misalignment opening 400. The misalignment opening 400 is provided in the iliac crest abutment region (the trunk periphery T in the illustrated example), as in the above-described cutout mold, but the outer body 12 has both sides, that is, from the side seal portion 12A. It extends toward the center in the width direction. This misalignment opening 400 is also an opening into which the wearer's iliac crest region fits, and is provided so that the pair is symmetrical with respect to the front body F of the exterior body 12 across the center line in the width direction. . However, as shown in FIG. 10 (3), the misalignment opening 400 extends from one side seal 12A to the other side seal 12A, that is, a pair of left and right misalignment openings 400. May be a continuous form.

  Also in this embodiment, the diaper can be prevented from slipping down without increasing the elastic expansion and contraction force in the trunk periphery T of the outer body 12 that forms the front body F and the outer body 12 that forms the rear body B. In this respect, the iliac crest region may be slightly displaced in the width direction depending on the wearer. However, according to the present embodiment, the effect of the displacement is not affected by this embodiment, and in this respect, the slip prevention effect is superior to the cutout die. Also in this embodiment, the above-described effects can be obtained without changing the manufacturing process of the side seal portion 12A. Furthermore, in this embodiment, the function as the vent of the misalignment opening 400 can be greatly expected by appropriately devising the extension length of the misalignment opening 400.

  In this embodiment, the tensile force at the time of elastic deformation in the width direction of the exterior body 12 forming the front body F is, for example, 3.0 to 16.0 N, preferably 5.0 to 14.0 N, as in the case of the cutout mold. Can be suppressed. Similarly, the tensile force at the time of elastic deformation in the width direction of the exterior body 12 forming the back body B can be suppressed to, for example, 3.0 to 16.0 N, preferably 5.0 to 14.0 N. In this regard, if the tensile force at the time of elastic deformation in the width direction of the outer body 12 that forms the front body F or the afterglow B is less than 3.0 N, the iliac crest region is easily detached from the misalignment opening 400, and the diaper slips The drop prevention effect may be insufficient. Moreover, there exists a possibility that the fitting feeling of this diaper 100 may become inadequate. On the other hand, if the tensile force in the elastic deformation in the width direction of the outer body 12 that forms the front body F or the rearward appearance B exceeds 16.0 N, the wearer's skin may be marked or rashed.

  Each misalignment opening 400 can have a distance 400X from the front end in the front-rear direction of the exterior body 12 of, for example, 10 to 80 mm, preferably 20 to 50 mm, and more preferably 20 to 30 mm. In addition, each misalignment opening 400 can have a length 400L in the front-rear direction of, for example, 20 to 80 mm, preferably 40 to 70 mm, and more preferably 50 to 60 mm, as in the case of the cutout mold. Furthermore, each misalignment opening 400 can have a length 400W in the width direction of, for example, 5 to 120 mm, preferably 10 to 80 mm, and more preferably 30 to 60 mm.

  In addition, although the misalignment opening 400 in the illustrated example has a belt shape, for example, the length 400L in the front-rear direction may be appropriately changed.

<Using side seal part: First example>
Next, an example in which a misalignment opening is provided using the side seal portion 12A will be described.
The pants type disposable diaper 100 of the side seal part utilization (peeling) type | mold (1st example) was shown to (1) of FIG. In the diaper 100, in the side seal portion 12A, at least a partial region in the vertical direction has a bonding force relatively weaker than other regions or a non-bonded disengagement portion 12Ax. Further, in the vertical region having the side seal portion 12A of the exterior body 12, in the present embodiment, the waist portion T, (width Xf of the exterior body 12 forming the front body F) <(the exterior body 12 forming the back body B) Width Xb). In this embodiment, as shown in FIG. 11 (3), the mounting separation portion 12 </ b> Ax is opened during mounting, and this opening becomes the misalignment opening 500. Further, since (width Xf of the outer body 12 forming the front body F) <(width Xb of the outer body 12 forming the rear body B), the misalignment opening 500 is located on the stomach side of the wearer. Therefore, it is possible to obtain the same operational effects as those of the above-described cutout mold and cutout mold only by changing the joining method of the side seal portions without providing a new manufacturing process such as a cutout process or a cutout process.

  Each mounting separation portion 12Ax can set the distance 500X from the front end in the front-rear direction of the side seal portion 12A to, for example, 10 to 80 mm, preferably 20 to 50 mm, and more preferably 20 to 30. In addition, each mounting separation portion 12Ax can have a longitudinal length 500L of, for example, 20 to 80 mm, preferably 40 to 70 mm, and more preferably 50 to 60 mm.

  In the case of non-bonding for each mounting separation portion 12Ax, it is not necessary to perform welding, bonding, or the like. On the other hand, when the bonding force is relatively weak, for example, the gaps are arranged at intervals in the front-rear direction. A plurality of rows of dotted welded portions are arranged in the width direction, and the side seal portion 12A is formed with a dot pattern having non-welded portions over the entire width direction on both longitudinal sides of each welded portion, A method may be considered in which the disengagement portion 12Ax at the time of attachment is a loosely welded region and the other region 12Ay is a densely welded region. The details of this method can be referred to, for example, JP2013-146419A. In addition, a method is conceivable in which the mounting separation part 12Ax is used as a weak welding area and the other area 12Ay is used as a strong welding area on the premise that the dot pattern is used. That is, the welding force is increased or decreased while maintaining the same welding pattern.

<Using side seal part: second example>
FIG. 11 (2) shows a pants-type disposable diaper 100 of the side seal portion utilization (peeling) type (second example). In the diaper 100 as well, in the side seal portion 12A, at least a partial region in the vertical direction has a bonding force relatively weaker than other regions or a non-bonded disengagement portion 12Ax. On the other hand, unlike the first example, in the waistline T, the width of the outer body 12 forming the front body F and the width of the outer body 12 forming the rear body B are the same, The tensile force Pb at the time of elastic deformation of the outer body 12 to be made >> (the tensile force Pb at the time of elastic deformation of the outer body 12 that forms the back body B).

  Also in this embodiment, as shown in FIG. 11 (3), the mounting separation portion 12Ax is opened during mounting, and this opening becomes the misalignment opening 600. Moreover, since it is made into (the tensile force Pf at the time of the elastic deformation of the exterior body 12 which comprises the back body B) of the width direction> (the tensile force Pb at the time of the elastic deformation of the exterior body 12 which forms the back body B), 600 is located on the ventral side of the wearer. Therefore, it is possible to obtain the same operational effects as those of the above-described cutout mold and cutout mold only by changing the joining method of the side seal portions without providing a new manufacturing process such as a cutout process or a cutout process.

  The distance 500X from the front-rear direction front edge of the side seal portion 12A and the length 500L in the front-rear direction of each mounting separation portion 12Ax can be the same as in the first example. In addition, the method of non-bonding each mounting separation portion 12Ax and the method of making the bonding force relatively weak are the same as in the first example.

  The tensile force Pf at the time of elastic deformation is, for example, 5.5 to 16.0 N, preferably 6.0 to 13.5 N. On the other hand, the tensile force Pb at the time of elastic deformation is Pb <Pf and can be set to, for example, 3.0 to 14.0 N, preferably 3.5 to 11.5 N.

  The elastic deformation tensile force Pf and elastic deformation tensile force Pb are, for example, the elongation rate and thickness (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area) of the elongated elastic elastic members 15 to 19 described above. ), And can be adjusted by changing the number of arrangement, the arrangement interval, and the like.

<Glossary>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
The “front / rear (vertical) direction” means a direction connecting the ventral side (front side) and the back side (rear side), and the “width direction” means a direction (left / right direction) orthogonal to the front / rear direction.
“Elongation rate” means a value when the natural length is 100%.
-"Gel strength" is measured as follows.
49.0 g of artificial urine (urea: 20 wt%, salt: 8 wt%, calcium chloride dihydrate: 0.3 wt%, magnesium oxide heptahydrate: 0.8 wt%, pure water: 70.01 wt%), Add 1.0 g of superabsorbent polymer and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).
・ "Weight" is measured as follows.
After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
- "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 10 gf / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.
-The amount of water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resin".
・ The water absorption rate is the “time to end point” when JIS K7224-1996 “Test method for water absorption rate of superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. .
-“Tensile force during elastic deformation” means the tensile force (N) at an elongation of 200% when the natural length is 100%. The side seal of the disposable diaper is broken, and the front body or back body. This is a value obtained by grasping both ends in the width direction with a tensile tester and performing a tensile test at a tensile speed of 300 mm / min.

Next, examples of the present invention will be described.
First, with respect to the cut-out type pants-type diaper described above, a plurality of types in which the shape of the anti-displacement opening 300 and the swinging shape of the elongated elastic elastic members 17 and 19 were variously changed were prepared. Next, these pants-type diapers were put on a dummy doll, and the fit of each pant-type diaper to the dummy doll was visually evaluated.

  The elongated elastic elastic members 17 and 19 were fixed to the exterior sheet so as to have a length of 270% with respect to the length in the natural state (100%). The arrangement interval was 5 mm. Further, a fineness of 470 dt was used.

  The shape of the misalignment opening 300 and the swinging shape of the elongated elastic members 17 and 19 are shown in FIGS. As shown in FIG. 14, in Example 1, the shape of the misalignment opening 300 is a reverse raindrop shape (reverse egg shape). The elongated elastic elastic members 17 and 19 are not disposed in the region Za. The elongated elastic elastic members 17 and 19 in the region Zb have the aforementioned swing angle γb of 30 ° and are positioned above the center point of the misalignment opening 300 on both the back side B and the ventral side F. Arranged. The elongated elastic elastic members 17 and 19 in the region Zc have the aforementioned swing angle γc of 15 °, and are positioned below the center point of the misalignment opening 300 on both the back side B and the ventral side F. Arranged.

  As shown in FIG. 15, in Example 2, the shape of the misalignment opening 300 is a circular shape. The elongated elastic elastic members 17 and 19 in the region Za have the aforementioned swing angle γa of 45 °, and on the ventral side F so that the back side B is positioned above the center point of the misalignment opening 300. It arrange | positions so that it may be located below the center point of the slip prevention opening part 300. FIG. The elongated elastic elastic members 17 and 19 in the region Zb have the aforementioned swing angle γb of 30 ° and are positioned above the center point of the misalignment opening 300 on both the back side B and the ventral side F. Arranged. The elongated elastic elastic members 17 and 19 in the region Zc have the aforementioned swing angle γc of 15 °, and are positioned below the center point of the misalignment opening 300 on both the back side B and the ventral side F. Arranged.

  As shown in FIG. 16, in Example 3, the shape of the misalignment opening 300 is an inclined elliptical shape. The elongated elastic elastic members 17 and 19 in the region Za have the aforementioned swing angle γa of 45 °, and on the ventral side F so that the back side B is positioned above the center point of the misalignment opening 300. It arrange | positions so that it may be located below the center point of the slip prevention opening part 300. FIG. The elongated elastic elastic members 17 and 19 in the region Zb have the aforementioned swing angle γb of 30 ° and are positioned above the center point of the misalignment opening 300 on both the back side B and the ventral side F. Arranged. The elongated elastic elastic members 17 and 19 in the region Zc have the aforementioned swing angle γc of 15 °, and are positioned below the center point of the misalignment opening 300 on both the back side B and the ventral side F. Arranged.

  As shown in FIG. 17, in Example 4, the shape of the misalignment opening 300 is a reverse raindrop shape (reverse egg shape). The elongated elastic elastic members 17 and 19 in the region Za have the aforementioned swing angle γa of 45 °, and on the ventral side F so that the back side B is positioned above the center point of the misalignment opening 300. It arrange | positions so that it may be located below the center point of the slip prevention opening part 300. FIG. The elongated elastic elastic members 17 and 19 in the region Zb have the aforementioned swing angle γb of 30 ° and are positioned above the center point of the misalignment opening 300 on both the back side B and the ventral side F. Arranged. The elongated elastic elastic members 17 and 19 in the region Zc have the aforementioned swing angle γc of 15 °, and are positioned below the center point of the misalignment opening 300 on both the back side B and the ventral side F. Arranged.

  As shown in FIG. 18, in Example 5, the shape of the misalignment opening 300 is a reverse raindrop shape (reverse egg shape). The elongated elastic elastic members 17 and 19 in the region Za have the aforementioned swing angle γa of 30 °, and are positioned above the center point of the misalignment opening 300 on both the back side B and the ventral side F. Arranged. The elongated elastic elastic members 17 and 19 in the region Zb have the aforementioned swing angle γb of 30 ° and are positioned above the center point of the misalignment opening 300 on both the back side B and the ventral side F. Arranged. The elongated elastic elastic members 17 and 19 in the region Zc have the aforementioned swing angle γc of 15 °, and are positioned below the center point of the misalignment opening 300 on both the back side B and the ventral side F. Arranged.

  The pants-type diaper of each example was photographed from the left side and the front with the dummy doll being worn, and posted as FIGS.

(Evaluation)
Example 4 in which the shapes of the iliac bone and the stopper opening 300 were similar was the best fit. On the other hand, in Example 2 and Example 3 in which the shapes of the iliac bone and the anti-displacement opening 300 are different, the fit performance is slightly lowered. From this, it was found that the fitting properties are improved when the shapes of the iliac bone and the misalignment opening 300 are similar.

  Of course, even when the shapes of both are the same, if the elongated elastic elastic members 17 and 19 are not arranged on the ventral side F as in the first embodiment, the peripheral portion of the misalignment opening 300 is slightly lifted. I found out that Moreover, even if the elongate elastic elastic members 17 and 19 are disposed on the ventral side F of the anti-displacement opening 300 as in the fifth embodiment, the fit property is reduced if there is a wide area where the elastic elastic members 17 and 19 are not disposed. I also understood that.

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

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior body, 12A ... Side seal part, 12r ... Folded part, 12H ... Inner sheet material, 12S ... Outer sheet material, 15-19 ... Elongated elastic expansion-contraction member, 30 ... Top sheet 40 ... Intermediate sheet (second sheet), 50 ... absorbing element, 56 ... absorber, 58 ... packaging sheet, 60 ... solid gather, 62 ... gather sheet, 63 ... elongated elastic elastic member, 65 ... mounting portion, 66 ... Protruding portion, 67: Front and rear fixed portion, 68 ... Free portion, 100 ... Pants-type disposable diaper, 200 ... Interior body, 300, 400, 500, 600 ... Misalignment opening, B ... Rear view, F ... Front body, LO ... leg opening, T ... waist circumference, U ... waist lower part, W ... waist edge, WO ... waist opening, Za, Zb, Zc ... region.

Claims (7)

The side seal part is formed by joining the both sides of the outer body that forms the front body extending from the crotch to the ventral side and the both sides of the outer body that forms the back body extending from the crotch to the back side. A pants-type disposable diaper in which a waist opening for passing a wearer's torso and a pair of left and right leg openings for passing a leg are formed, and an interior body including an absorbent body is provided inside the exterior body Because
The longitudinal region having the side seal portion of at least one of the exterior body forming the front body and the exterior body forming the back body is configured to elastically expand and contract in the width direction,
And, in the iliac crest abutment region that is in the longitudinal region and abuts on the wearer's iliac crest region, a slip stopper opening is provided,
A pants-type disposable diaper characterized by that. The tensile force at the time of elastic deformation in the width direction of the outer body forming the front body is 3.0 to 16.0 N,
And the vertical direction length of the shift stop opening is 20 to 80 mm,
The pants-type disposable diaper according to claim 1. A cutout is formed in the outer body that forms the front body, and the cutout is the misalignment opening.
The underpants type disposable diaper of Claim 1 or Claim 2. The misalignment opening is an elongated shape having a longitudinal direction and a width direction,
The crotch side is a shape inclined to the abdomen and the waist side to the back,
The pants-type disposable diaper according to claim 3. A notch extending from both sides toward the center in the width direction is formed in the outer body that forms the front body, and the notch serves as the misalignment opening.
The underpants type disposable diaper of Claim 1 or Claim 2. In the vertical region having the side seal portion of the exterior body, (the width of the exterior body forming the front body) <(the width of the exterior body forming the back body),
And, in the side seal part, at least a part of the vertical direction is a relatively weak joining force than other areas, or a non-joining detachment part,
When the disengagement part at the time of opening is configured to be the misalignment opening,
The underpants type disposable diaper of Claim 1 or Claim 2. In the longitudinal region having the side seal portion of the exterior body, the width direction (tensile force during elastic deformation of the exterior body forming the front body)> (tensile force during elastic deformation of the exterior body forming the back body). And
And, in the side seal part, at least a part of the vertical direction is a relatively weak joining force than other areas, or a non-joining detachment part,
When the disengagement part at the time of opening is configured to be the misalignment opening,
The underpants type disposable diaper of Claim 1 or Claim 2.