JP2015171501A - absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase rigidity while suppressing flexibility of touch to the skin and following deformability in three-dimensional gathers.SOLUTION: In three-dimensional gathers 60 which have gather sheets 62 of a multi-layer structure and vertically slender gather elastic stretch members 63 fixed between layers of the gather sheets 62 along a back and forth direction, a first layer 62a and a second layer 62b which are positioned on one side and the other side of the gather elastic stretchable members 63 in the gather sheets 62 are joined by adhesive 71 arranged intermittently in the back and forth direction, crossing the gather elastic stretch members 63 and stretching, and joint processing parts 70 are formed. The gather elastic stretchable members 63 are fixed to at least either the first layer 62a or the second layer 62b at a position crossing the joint processing parts 70. Widths in a stretching direction of the respective joint processing parts 70 are 4 mm or narrower, and gaps between adjacent joint processing parts 70 range from 4 to 8 mm.

Description

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

  In absorbent articles such as disposable diapers and sanitary napkins, three-dimensional gathers projecting toward the body side extend in the front-rear direction on both sides in the width direction on the inner surface in order to improve fit to the legs. The thing is common (for example, refer patent document 1). By providing such a three-dimensional gather, excrement remains between the compatible body gathers, and in particular, leakage of excrement from the wearer's leg periphery is prevented.

  The three-dimensional gather has a two-layered gathered sheet by folding a sheet of non-woven fabric or the like, and an elongated gathered elastic elastic member fixed along the front-rear direction between the layers of the gathered sheet. The gather sheet is provided at the root portion fixed to the side of the absorbent article, the protruding portion protruding from the root portion, and the front and rear end portions of the protruding portion, respectively, and in a lying state with respect to the surface of the main body portion And a non-fixed free portion located between the front and rear lodging portions of the projecting portion, and a gather elastic elastic member is provided at least at the tip of the free portion of the gather sheet. It is fixed in a stretched state in the front-rear direction. At the time of use, a free part rises and adheres to the skin by the contracting action of the gather elastic elastic member, and leakage is prevented. In general, there is a line contact type three-dimensional gather in which the tip of the free part is in contact with the body, and a surface contact type three-dimensional gather in which the protruding part is folded back and the tip side is in contact with the body. It is widely used.

  The gather elastic elastic member is fixed to the gather sheet with a hot melt adhesive, and conventionally, a hot melt adhesive is applied to the peripheral surface of the gather elastic elastic member so as not to impair the flexibility of the three-dimensional gather. The hot melt adhesive was applied only at the passing position of the gather elastic elastic member and in the vicinity thereof.

JP 2006-247272 A

  However, if the gathering strength of the three-dimensional gather is reduced, such as using a gather sheet with excellent flexibility in order to make the contact of the three-dimensional gather against the skin flexible, deviations and misalignments are likely to occur during wearing. There is a risk of promoting the occurrence of leakage. However, because the three-dimensional gather is the part that adheres elastically to the skin, simply increasing the rigidity not only makes it difficult for the wearer to follow and deform, but also makes the skin harder. End up.

  Then, the main subject of this invention is to raise rigidity, suppressing the fall of the softness | flexibility and tracking deformability of the touch in a three-dimensional gather.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An absorbent body, a liquid-permeable top sheet and a liquid-impermeable sheet that respectively cover the front side and the back side of the absorbent body, and three-dimensional gathers extending along the front-rear direction on both sides in the width direction,
The three-dimensional gather has a gather sheet having a multi-layer structure, and an elongated gather elastic elastic member fixed along the front-rear direction between layers of the gather sheet.
The gather sheets are provided at the root portion fixed to the side portion of the absorbent article, the protruding portion protruding from the root portion, and the front and rear end portions of the protruding portion, respectively, on the surface of the main body portion in the lying state A fixed lodging part, and a non-fixed free part located between the front and rear lodging parts of the projecting part,
The gather elastic elastic member is fixed in a stretched state in the front-rear direction to at least the tip of the free part in the gather sheet.
In absorbent articles;
In the gather sheet, the first layer and the second layer respectively located on one side and the other side of the gather elastic elastic member intersect with the gather elastic elastic member intermittently arranged in the front-rear direction. Joined by an adhesive or welding process, a joined part is formed,
The gather elastic elastic member is fixed to at least one of the first layer and the second layer at a position intersecting with the joining portion;
As the first elastic layer and the second layer contract as the elastic elastic member contracts, the portions of the first layer and the second layer that are located between the bonded portions swell in opposite directions to form wrinkles. Being
An absorbent article characterized by the above.

(Function and effect)
In the three-dimensional gather according to the present invention, the joint processing portion for joining the first layer and the second layer is continuous and intersects with the gather elastic elastic member, and a ridge that is continuous in the protruding direction of the three-dimensional gather is formed. It plays a role like a bone, and the rigidity of the three-dimensional gather in the protruding direction becomes high, so that twisting and shifting are less likely to occur. For that reason, since the eyelids are intermittent in the front-rear direction, they are easily deformed following the movement of the wearer. Further, although the bonded portion is hard, it is difficult to be exposed to the skin side due to the intercostal space, the crushed wrinkle wall portion, or the fallen wrinkle, and it is also important that the touch is hard.

  In the present invention, the adhesive for forming the bonded portion is continuous. In the portion where the bonded portion and the gather elastic elastic member intersect, the first layer side and the second layer side of the gather elastic elastic member. In addition to the form in which the adhesive is continuous in the direction intersecting the expansion / contraction direction on both sides, the adhesive is continuous on either side because the gather elastic expansion / contraction member is interposed, but the adhesive is in the direction intersecting the expansion / contraction direction on the other side. Including a discontinuous form.

  Further, in the present invention, the welding process for forming the bonded portion is continuous means that the first layer and the second layer are gathered and elastically stretched as long as the welding mark remains on at least one of the first layer and the second layer. The members are welded to each other and the first layer and the second layer are indirectly welded so that the welding is continued, and the gather elastic stretchable member is formed at a portion where the joining processed portion and the gather elastic stretchable member intersect. It includes a form in which the welding between the first layer and the second layer is not continuous due to the interposition.

  Furthermore, the gather elastic elastic member is fixed to the sheet at a position where it intersects with the bonded portion. The gather elastic elastic member and the sheet are bonded (bonded) at the position where the gather elastic elastic member and the bonded portion intersect. In addition to bonding with an agent, welding is included. The same applies hereinafter.) The gather elastic elastic member and the sheet are not bonded, but the interval between the joining portions in the direction crossing the expansion and contraction direction is gathered. The elastic elastic member is narrower than the natural length of the elastic stretch member, and the gather elastic elastic member is fixed by being sandwiched between the joining processed parts, so that the contraction force of the gather elastic elastic member intersects the joining processed part. The form transmitted to is also included. The latter principle is common to the principles described in, for example, Japanese Patent Application Laid-Open Nos. 2008-154998 and 2009-106667.

<Invention of Claim 2>
The absorptive article according to claim 1 whose width of the expansion-contraction direction of each joined processing part is 4 mm or less, and the interval of adjacent joined processed parts is 4-8 mm.

(Function and effect)
The invention described in this section combines the interval between adjacent bonded portions and the width in the expansion / contraction direction of each bonded portion within a specific range, and achieves both a height sufficient for the wrinkles formed on the surface of the three-dimensional gather and the difficulty of falling down. Is. In the present invention, the width in the expansion / contraction direction of each joint processed portion affects the interval between adjacent ridges. When this width exceeds 4 mm, the space between adjacent ridges becomes too wide, and individual ridges are independent. Not only does it look good, but also when the deformation of the folds collapses or collapses due to the compressive force in the thickness direction, the effect of supporting adjacent folds becomes weaker, resulting in less resistance to deformation or restoration after change. As a result, the feeling of fun is insufficient.

  In addition, when the width in the expansion / contraction direction of the bonded portions is simply 4 mm or less, and the interval between adjacent bonded portions is less than 4 mm and greater than 8 mm, the following occurs. That is, the interval between adjacent joints affects rigidity and follow-up deformability, and when it is 3 mm or less, almost no wrinkles are formed, and the rigidity improvement in the protruding direction of the three-dimensional gathers due to wrinkles is poor (expansion and contraction). There is no point in intermittently providing a joining portion in the direction). Moreover, when the space | interval of a joining process part exceeds 8 mm, a wrinkle will be crushed irregularly by compression at the time of packaging, and there exists a possibility that the improvement of the softness | flexibility of the touch by a wrinkle may be impaired. On the other hand, when the width in the expansion / contraction direction of the bonded portion is 4 mm or less and the interval between the bonded portions is 4 to 8 mm, the balance between rigidity and follow-up deformability is good, and the softness of the touch due to wrinkles is also provided. Sufficiently secured.

<Invention of Claim 3>
The gather elastic elastic member is provided on the distal end side of the free portion with a plurality of intervals.
The absorptive article according to claim 1 or 2 whose interval of adjacent gather elastic elastic members in these gather elastic elastic members is 10 mm or less.

(Function and effect)
If the distance between adjacent elastic elastic members (not the center distance) exceeds 10 mm, the thickness of the heel changes in a direction crossing the expansion / contraction direction, and the shape of the heel tends to be irregular. Therefore, if the ridges have a regular shape, the interval between adjacent elastic stretch members is preferably 10 mm or less.

<Invention of Claim 4>
Wherein each of the first and second layers, thickness 0.1 to 1 mm, a nonwoven fabric having a basis weight of 10 to 20 g / m ^2, the absorbent article according to any one of claims 1 to 3.

(Function and effect)
The present invention is particularly suitable for such first and second layers.

<Invention of Claim 5>
The absorptive article according to any one of claims 1 to 4 whose extension rate of said gather elastic elastic member in the state where said solid gathers were fully extended is 150 to 350%.

(Function and effect)
By adopting such an elongation rate, the above-described effects of the present invention become more remarkable. The elongation rate means a value when the natural length is 100%.

<Invention of Claim 6>
The protruding portion of the gather sheet has a base end portion that extends toward the center in the width direction on the front surface side, and a tip end portion that is folded back outward in the width direction from the tip of the base end portion. The absorbent article according to any one of claims 1 to 5.

(Function and effect)
In this way, the surface contact type three-dimensional gather, in which the protruding part is folded back and the tip side part is in direct contact with the body, is less likely to maintain a favorable contact state when twist or misalignment occurs compared to the line contact type. , The contact with the skin is hard to become strong. Therefore, when the present invention is applied to such a surface contact type three-dimensional gather, the shape maintenance property, which is a disadvantage of the surface contact type, is compensated by the rigidity improvement by the collar of the present invention, and the deterioration of the touch that may become a disadvantage by the rigidity improvement Can be supplemented by the advantages of the surface contact type.

<Invention of Claim 7>
The absorptive article according to any one of claims 1 to 6 in which said joined processing part is continuing along a direction inclined with respect to a direction perpendicular to said gather elastic elastic member.

(Function and effect)
In the three-dimensional gather of the present invention, since a large number of ridges extending in the direction crossing the gather elastic elastic member are formed in the front-rear direction, it is preferable in terms of air permeability, but there is a risk that leakage will occur through the ridges. is there. Therefore, as described in this section, it is one preferable mode that the direction of the bonded portion is inclined to increase the length of the passage between the ribs and improve the leakage prevention property.

<Invention of Claim 8>
The absorption according to any one of claims 1 to 6, wherein the joining processed portion has a wave shape continuous in a direction orthogonal to the gather elastic elastic member while reciprocating in a direction along the gather elastic elastic member. Sex goods.

(Function and effect)
In the three-dimensional gather of the present invention, since a large number of ridges extending in the direction crossing the gather elastic elastic member are formed in the front-rear direction, it is preferable in terms of air permeability, but there is a risk that leakage will occur through the ridges. is there. Therefore, as described in this section, the welded portion is formed in a wave shape, the corridor passage is extended in a wave shape, and not only the passage length is increased but also the collision property to the passage wall is improved, thereby preventing leakage. It is one preferred form to increase the.

<Invention of Claim 9>
The absorptive article according to any one of claims 1 to 8 in which said joined processing part is spaced apart from the tip of said solid gathers to the base end side.

(Function and effect)
The joint processing part may extend to the tip of the three-dimensional gather, but since the joint processing part is a hard part and the tip of the three-dimensional gather is the part that hits the skin most strongly, the base end from the tip of the three-dimensional gather It is also a preferable form to ensure the flexibility of the tip of the three-dimensional gather by being separated to the side.

  As described above, according to the present invention, there are advantages such as an increase in rigidity while suppressing a decrease in softness of touch and follow-up deformability in a three-dimensional gather.

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. (A) a plan view in an unfolded state, (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in an extended state, (d) 7- FIG. (A) a plan view in an unfolded state, (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in an extended state, (d) 7- FIG. (A) a plan view in an unfolded state, (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in an extended state, (d) 7- FIG. It is a top view which shows the principal part of (a) expansion | extension state and (b) contraction state. (A) (b) is a top view of the unfolding state which shows the principal part of a solid gather. It is a top view of the expansion | deployment state which shows the principal part of a solid gather. It is the schematic which shows the (a) unfolding state and (b) natural length state of the test piece I. It is the schematic which shows (a) unfolding state and (b) natural length state of the test piece II.

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

  The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior body 12 is a part that supports the interior body 200 with respect to the wearer's body. The dotted pattern in the cross-sectional view shows the joint where each component is joined. The solid stretch of beads such as hot melt adhesive, beads, curtains, summits, spiral coating, etc. Instead of or together with this, it is formed by coating on the outer peripheral surface of an elastic stretchable member such as comb gun or sure wrap coating. In addition, “front-rear direction” means a direction connecting the ventral side (front side) and the back side (rear side), “width direction” means a direction (left-right direction) perpendicular to the front-rear direction, and “up-down direction Is the wearing state of the diaper 100, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch so that both sides of the front body and the back body of the diaper 100 overlap each other, in other words It means the direction connecting the waist opening WO side and the crotch part 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 top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a three-dimensional gather 60 that stands on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

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

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

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

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

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

(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 is preferably extended to both sides of the side surface of the top sheet 30 of the absorbent element 50 so as to improve leakage resistance. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable sheet 11, especially the absorber 56 side surface.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member extending over the entire front-rear direction along both side edges of the interior body 200, and is provided to block laterally moving urine and soft stools and prevent side leakage. It is. 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 includes a gather sheet 62 having a two-layer structure in which a belt-like sheet material having a length equal to the length in the front-rear direction of the interior body 200 is folded back and folded into two. Further, it has an elongated gather elastic elastic member 63 which is fixed along the front-rear direction between the layers of the gather sheet 62. 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 gather sheet 62 is a root portion 65 fixed to the back surface of the side edge portion of the interior body 200, A portion other than the root portion 65 is a protruding portion 66 (a portion on the folded portion side) that protrudes from the root 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 while the front-and-rear direction both ends of the protrusion part 66 are the lying state, it is set as the lying part 67 fixed to the side surface of the top sheet 30 by a hot melt adhesive or heat sealing. The middle part in the front-rear direction positioned between them is an unfixed free part 68, and at least the free part 68 is fixed with a plurality of gather elastic elastic members 63 extending in the front-rear direction at intervals in the width direction. Has been.

The gather sheet 62 can be folded as shown in the figure to form a multi-layer structure, or a plurality of materials can be bonded together to form a multi-layer structure. As the sheet material of the gather sheet 62, 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 silicon as required. What gave the water-repellent process by etc. can be used suitably. As the nonwoven fabric, a nonwoven fabric having a thickness of 0.1 to 1.0 mm and a basis weight of 10 to 20 g / m ² is preferable. As the gather elastic elastic member 63, thread rubber 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.

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

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

  In the three-dimensional gather 60 configured in this way, the contraction force of the gather elastic elastic member 63 acts so as to bring the both ends in the front-rear direction close to each other. Thus, since they are non-fixed free portions, only the free portions stand so as to abut on the body side as shown in FIG. In particular, when the root portion 65 is positioned on the back 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. In addition, the distance W3 between the folds located on the innermost side in a state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the top sheet 30 is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  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, 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. When the shape is formed, it is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.

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

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The ratio of particles remaining on the sieve is preferably 30% by weight or less, and the ratio of particles remaining on the sieve by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006). Is preferably 60% by weight or more.

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

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

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

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

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

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

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

(Exterior body)
The exterior body 12 has a part constituting a front body F extending from the crotch part to the abdomen and a part constituting a 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 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 front-rear direction of a portion forming the leg opening LO An intermediate portion L determined by a range (between a longitudinal region having the side seal portion 12A of the front body F and a longitudinal region having the side seal portion 12A of the rear 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 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. Although 12H extends only to the edge of the waist opening WO, the outer sheet material 12S wraps around the edge on the waist side of the inner sheet material 12H and is folded inside, and the folded portion 12r is an interior body. It extends so as to cover up to 200 on the waist end.

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, it is preferable that the basic weight shall be about 10-30 g / m < ² >.

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

  And in the exterior body 12, in order to improve the fitting property with respect to the waist, elongated elastic elastic members 15 to 19 such as thread rubber are provided between the sheet materials 12S and 12H 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.

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

  Further, between the outer side surface of the inner sheet 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, the upper side thereof. A plurality of waist lower elastic elastic members 15 and 19 made of an elongated elastic elastic member are continuously provided in the respective parts on both sides in the width direction so as to be continuous over the entire width direction. It is fixed in the state extended | stretched along the width direction.

The waist lower elastic elastic members 15 and 19 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 1 to 15 mm, particularly 3 to 8 mm, and about 5 to 30 at an elongation of 200 to 350%, particularly about 240 to 300%.

  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 at intervals 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 about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

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

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

(Post-processing tape)
A post-treatment tape 90 (fixing means) can be provided at the center in the width direction on the outer surface of the rear body B of the outer package 12. The post-processing tape 90 is for fixing the diaper 100 in a state of being rounded or folded so that the top sheet 30 is on the inside and the front body F is on the inside. As shown in FIG. 5, a general post-processing tape 90 has a base end portion 91 fixed to the outer surface of the exterior body 12 with an adhesive or the like, and a portion on the front end side of the base end portion 91 is folded in three. (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 92 so as to be peelable. Moreover, while having the knob | pick part 93 colored in opaque colors, such as white, in the front-end | tip part, the part except this knob | pick part 93 is transparent or semi-transparent, Through the transparent or semi-transparent part in this post-processing tape 90, A design to be described later is visible from the outer surface side of the post-processing tape 90. Although the specific structure can be appropriately configured, in the illustrated embodiment, the whole is formed by connecting a plurality of transparent or translucent substrates in the longitudinal direction, and a colored tape 94 is bonded to the knob 93. Is adopted.

  At the time of disposal, the diaper 100 is rolled or folded so that the top sheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-processing tape 90 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 90 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 90 may be provided on the front body F or on both the back body B and the front body F.

(Print sheet)
A printing sheet 25 that is designed by printing is provided between the liquid-impermeable sheet 11 and the outer package 12 (including the layers of the outer package 12). The exterior body 12 may be omitted and the printing sheet 25 may be exposed on the outer surface. The printed sheet 25 in the illustrated example has a smaller area than the body on which the printed sheet 25 is disposed, and is provided separately for the front body F and the back body B, but passes through the crotch from the front body F. It can also be provided so as to continue to the back body B integrally.

  Although the size and shape of the printing sheet 25 are not particularly limited, it is preferable to sufficiently increase the area in order to make the function sufficient. For example, the width of the printing sheet 25 is 50 to 120 of the width of the absorber 56. The length of the printing sheet 25 is preferably about 15 to 30% of the total length Y of the article on at least one side of the stomach side and the back side. Further, the shape of the print sheet 25 is preferably a rectangle as shown in the figure in that trim loss does not occur. However, the print sheet 25 has a geometric shape such as a circle, an ellipse, a triangle, a hexagon, or a shape along the periphery of the design. You may cut it.

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

(External body split structure)
In the above-described example, the front body F to the back body B are continuously covered by the integrated exterior body 12, but the exterior body covers the abdominal 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 central portion in the width direction of the abdominal exterior body by a hot melt adhesive or the like, and the central portion in the width direction of the back side exterior body. 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 body and the back exterior body 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 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.

(About features)
For example, as shown in FIG. 9, the three-dimensional gather 60 is bonded continuously across the gather elastic elastic member 63 in which the first layer 62 a and the second layer 62 b of the gather sheet 62 are intermittently arranged in the front-rear direction. By joining with the agent 71 (hot melt adhesive 71 etc.), the joining process part 70 is formed.

  The gather elastic elastic member 63 is fixed to at least one of the first layer 62 a and the second layer 62 b by an adhesive 71 at a position intersecting the joining processed portion 70. In order to fix the gather elastic elastic member 63, an adhesive different from that for forming the bonded portion can be applied to the elastic elastic members or layers 62a and 62b. However, in the illustrated embodiment, the bonding portion 70 is formed. Since the adhesive 71 is continuous in the direction intersecting the gather elastic elastic member 63, the adhesive elastic elastic member 63 is fixed to at least one of the first layer 62a and the second layer 62b using the adhesive 71. ing. In manufacturing, the adhesive 71 is applied to one or both of the first layer 62a and the second layer 62b, and the gather elastic elastic member 63 is sandwiched between the layers 62a and 62b when the layers 62a and 62b are joined. Just put it in.

  In the form shown in FIG. 9, the adhesive 71 is applied to the surface of the first layer 62a on the second layer 62b side intermittently in the front-rear direction and continuously with a predetermined width in the direction intersecting the front-rear direction. The gather elastic elastic member 63 is sandwiched between the first layer 62a and the second layer 62b without applying the adhesive 71 on the surface of the second layer 62b on the first layer 62a side, and the first layer 62a and the second layer 62b, and the first layer 62a and the gather elastic elastic member 63 are joined by the adhesive 71, respectively. In this case, among the portions where the joining processed portion 70 and the gather elastic elastic member 63 intersect, the gathering elasticity is obtained by the adhesive 71 being continuous in the direction intersecting with the elastic direction on the first layer 62a side of the gather elastic elastic member 63. The elastic member 63 is fixed to the first layer 62a, and the adhesive 71 is discontinuous in the direction intersecting the elastic direction on the second layer 62b side of the gather elastic elastic member 63. In the figure, this discontinuous portion is indicated by reference numeral 72. Since the adhesive 71 is intermittently present in the second layer 62b, it is possible to suppress a decrease in flexibility of the second layer 62b, and hence a decrease in flexibility of the first layer 62a and the second layer 62b as a whole. Moreover, since the adhesive 71 continues even if the gather elastic elastic member 63 intersects the joining processed portion 70 only on the first layer 62a side, the ridge 80 is continuous in the protruding direction of the three-dimensional gather 60.

  Note that the adhesive 71 can be applied to the first layer 62a and the second layer 62b in the same pattern. In this case, as shown in FIG. 10, the adhesive on both the first layer 62 a side and the second layer 62 b side of the gather elastic elastic member 63 in the portion where the joining processed portion 70 and the gather elastic elastic member 63 intersect. Since 71 continues with a predetermined width in a direction intersecting with the expansion / contraction direction, the gather elastic expansion / contraction member 63 can be more firmly fixed, and there is an advantage that the rigidity is improved more uniformly. Although not shown, it is also possible to apply an adhesive to the second layer 63b and fix the first layer 63a by sandwiching an elastic member without applying the adhesive.

  Moreover, as shown in FIG. 11, the joining process part 70 can also be formed by a welding process. The welded portion is indicated by reference numeral 75. As the welding process, a known processing method such as heat sealing or ultrasonic welding can be employed. Here, the welding process for forming the bonded portion 70 is continuous, as long as the welding mark is continuous in at least one of the first layer 62a and the second layer 62b, the first layer 62a and the second layer 62b The gather elastic elastic member 63 is welded to each other and the first layer 62a and the second layer 62b are indirectly welded to form a continuous welding, as well as the joined portion 70 and the gather elastic elastic member 63 intersect. Since the gather elastic elastic member 63 is interposed in the portion 72 to be welded, the welded portion between the first layer 62a and the second layer 62b is not continuous. A ridge 80 is formed. For example, in a state where the gather elastic elastic member 63 is sandwiched between the first layer 62a and the second layer 62b, welding is performed in a continuous pattern across the gather elastic elastic member 63 by heat sealing or ultrasonic welding, and the gather elastic elastic member is stretched. If the first layer 62a and the second layer 62b are melted without melting the member 63, the first layer 62a and the second layer 62b and the gather elastic elastic member 63 are not welded, so that the latter form is obtained.

  The gather elastic elastic member 63 is fixed to at least one of the first layer 62a and the second layer 62b at a position intersecting with the joining processed portion 70. In this fixed form, the gather elastic elastic member 63 and the sheet are bonded to each other at the position where the gather elastic elastic member 63 and the joint processing portion 70 intersect (not only adhesion by the adhesive 71 such as the hot melt adhesive 71). The gather elastic elastic member 63 and the sheet are not bonded to each other, but the interval between the joining portions 70 in the direction intersecting with the expansion and contraction direction is a natural part of the gather elastic elastic member 63. As a result of being narrower than the long-time thickness and being fixed by sandwiching the gather elastic elastic member 63 between the joining portions 70, the contraction force of the gather elastic member 63 intersects the joining portion 70 on the sheet. The transmitted form (see Japanese Patent Application Laid-Open Nos. 2008-154998 and 2009-106667) is also included. More specifically, in the latter form, as shown in FIG. 12A, the gather elastic elastic member 63 extended to a higher expansion rate than the fixed expansion rate is provided between the first layer 62a and the second layer 62b. In the sandwiched state, the bonded portion 70 is welded in a continuous pattern across the gather elastic elastic member 63 by heat sealing or ultrasonic welding, and the first elastic layer 62a and the second layer 62a are melted without melting the gather elastic elastic member 63. The layer 62b is melted, the first layer 62a and the second layer 62b, and the gather elastic elastic member 63 are not welded, and thereafter the tension of the gather elastic elastic member 63 is released as shown in FIG. The gather elastic elastic member 63 can be contracted to increase the diameter, and the gather elastic elastic member 63 can be sandwiched between the joining portions 70. As a result, the manufactured stretchable structure has a gather elastic expansion / contraction at a portion where the joining processed portion 70 and the gather elastic expansion / contraction member 63 intersect, although the welding process trace is continuous in at least one of the first layer 62a and the second layer 62b. Since the member 63 is interposed, the welding between the first layer 62 a and the second layer 62 b is not continuous, and the gather elastic elastic member 63 is fixed by being sandwiched between the joining processed portions 70.

  When the bonded portion 70 is formed by welding, the bonded portion 70 is likely to be harder than the bonding by the hot melt adhesive, but the rigidity improvement effect is high. What is necessary is just to select suitably whether a hot-melt-adhesive is employ | adopted.

  The width 70w in the expansion / contraction direction of each joint processing portion 70 and the interval 70d between the adjacent joint processing portions 70 can be appropriately determined, but the width 70w in the expansion / contraction direction of each joint processing portion 70 is preferably 4 mm or less, More preferably, it is 2 mm or less, and particularly preferably 1.5 mm or less. Further, the width 70w in the expansion / contraction direction of the sheet joining portion 70 is preferably 1 mm or more from the viewpoint of ease of manufacture, but is preferably 0.5 mm or more from the viewpoint of flexibility. Moreover, it is preferable that the space | interval 70d of the adjacent joining process parts 70 is 4-8 mm, and it is especially preferable that it is 5-7 mm.

  Although the interval between the adjacent gather elastic elastic members 63 can be determined as appropriate, the interval 63d between the adjacent elastic elastic members 63 is 10 mm or less, particularly 3 to 8 mm, at the portion that can come into contact with the skin on the tip side of the three-dimensional gather. Then, it is preferable because the shape of the ridge is less likely to be irregular.

  The joining processed portion 70 may be continuous up to the tip of the gather sheet 62. However, the joining processed portion 70 is a hard portion and the tip of the three-dimensional gather 60 is the portion that hits the skin most strongly, and is shown in FIG. Thus, it is also a preferable form that the solid gather 60 is slightly spaced from the distal end to the proximal end side. In this case, it is desirable that the separation distance between the front end of the three-dimensional gather 60 and the joining processed portion 70 is about 0.5 to 4 mm. As can be seen from this, the joining processed portion 70 is provided not only in the protruding direction of the gather sheet 62 but also in a part such as the entire protruding portion 66, the entire free portion 68, or only the front end side of the free portion 68. The other parts can be joined in the same manner as in the prior art.

  If the joining processed portion 70 is intermittent in the expansion / contraction direction, a decrease in the fixing force of the gather elastic elastic member 63 is unavoidable, and the gather elastic elastic member 63 may come off and contraction force may not work. In particular, it is desirable that the width 70w in the expansion / contraction direction of each joint processing portion 70 is narrow. In this case, the position where the gather elastic elastic member 63 and the joint processing portion 70 intersect is small, and the gather elastic elastic member is at this small position. It is necessary to fix 63, and securing of the fixing force of the gather elastic elastic member 63 is important. Therefore, the gather elastic elastic member 63 may be partially fixed to at least one of the first layer 62a and the second layer 62b even at a position other than the position where it intersects with the bonded portion 70, and the gather elastic elastic member 63 may be reinforced. One preferred form. For example, an adhesive such as a reinforcing hot melt adhesive is applied to a region where both ends of the gather elastic elastic member 63 are located in at least one of the first layer 62a and the second layer 62b, and the first The fixing of the gather elastic elastic member 63 to the layer 62a and the second layer 62b can be reinforced.

  In the three-dimensional gather 60 described above, as the gather elastic elastic member 63 contracts, as shown in FIG. 9 (b), the portions located between the joining processed portions 70 in the first layer 62a and the second layer 62b are respectively It shrinks and bulges in opposite directions to form a ridge 80. FIG. 9B shows a natural length state, but when attached, the gather elastic elastic member 63 is extended to a certain extent, and as shown in FIG. The height 80h of 80 becomes low. As a result, in this three-dimensional gather 60, the joining processing part 70 which joins the 1st layer 62a and the 2nd layer 62b cross | intersects the gather elastic elastic member 63, and the heel 80 continues in the protrusion direction of the three-dimensional gather 60. Therefore, the collar 80 plays a role like a bone, the rigidity of the three-dimensional gather 60 in the projecting direction is increased, and the warp and the shift are less likely to occur. For that reason, since the heel 80 is intermittent in the front-rear direction, it becomes easy to deform following the movement of the wearer. Furthermore, although the joining processing part 70 becomes a hard thing, since it becomes difficult to expose on the skin side by the wall part of the ridge 80, the wall part of the crushed ridge 80, and the fallen ridge 80, the point that a touch is hard to become hard is also important. .

  In particular, the width in the expansion / contraction direction of each joining processed portion 70 affects the interval between adjacent ridges 80. When this width exceeds 4 mm, the space between adjacent ridges 80 becomes too wide, and individual ridges 80 Is not only an independent appearance, but also when the deformation of the ridge 80 is crushed and spread by the compressive force in the thickness direction, the action of supporting adjacent ridges 80 becomes weak, resulting in resistance to deformation or after change Restoration will also be weak, and as a result, there will be a lack of comfort. In addition, when the width in the expansion / contraction direction of the joining processed part 70 is simply set to 4 mm or less, and the interval between adjacent joining processed parts 70 is less than 4 mm and more than 8 mm, the following occurs. That is, the interval between the adjacent bonded portions 70 affects the rigidity and follow-up deformability, and when the thickness is 3 mm or less, the ridge 80 is hardly formed, and the rigidity improvement in the protruding direction of the three-dimensional gather 60 by the ridge 80 is poor. (It is no longer necessary to intermittently provide the bonded portion 70 in the expansion and contraction direction). Moreover, when the space | interval of the joining process part 70 exceeds 8 mm, the wrinkle 80 will be crushed irregularly by compression at the time of packaging, and there exists a possibility that the improvement of the softness | flexibility of the touch by the wrinkle 80 may be impaired. On the other hand, when the width in the expansion / contraction direction of the bonded portion 70 is 1 to 4 mm and the interval between the bonded portions 70 is 4 to 8 mm, the balance between rigidity and follow-up deformability is good, and the touch by the heel 80 The sufficient flexibility is also ensured.

  Further, like the three-dimensional gather 60 in the illustrated embodiment, the protruding portion 66 of the gather sheet 62 has a base end side portion extending toward the center in the width direction on the surface side, and a width direction from the tip of the base end side portion. In the case of a surface contact type having a front end portion folded back to the outside, it is difficult to maintain a favorable contact state when the deflection or deviation occurs, compared to the line contact type, but the contact with the skin is difficult to increase. Therefore, when the above-described expansion and contraction structure is applied to such a surface contact type three-dimensional gather 60, the shape maintaining property, which is a disadvantage of the surface contact type, is compensated by the rigidity improvement by the heel 80, and the touch that may become a disadvantage due to the rigidity improvement. Deterioration can be compensated by the advantages of the surface contact type, which is preferable.

  In the form shown in FIGS. 9 to 11, the joining processed portion 70 is linearly continued along the direction orthogonal to the gather elastic elastic member 63, and the flange 80 extending in the direction intersecting the gather elastic elastic member 63 is front and rear. Since many are formed in the direction, it is preferable in terms of air permeability, but there is a possibility that leakage occurs between the ridges 80. Therefore, as shown in FIG. 13 (a), it is one preferable embodiment to increase the passage length between the flanges 80 by increasing the direction of the bonded portion 70 and to improve the leakage prevention property. In this case, in addition to making the joining processed portion 70 linear, it may be curved.

  Further, as shown in FIG. 13 (b), the joining processed portion 70 is formed in a wave shape to extend the passage between the flanges 80 in a wave shape, thereby improving not only the passage length but also the collision with the passage wall. Thus, it is also a preferable form to improve the leakage prevention property. The wave-like joining processed portion 70 may have a triangular wave shape (zigzag shape) as shown in the illustrated example, or other periodic or non-periodic wave shapes such as a sine wave shape.

<Effect confirmation test>
Various elastic sheets were prepared, and the bending resistance was measured according to the bending resistance A method (45-degree cantilever method) of JIS L1096: 2010 “Fabric and knitted fabric testing method”. The softness and hardness of the touch were subjected to sensory evaluation in five levels (very soft, soft, neither, hard, very hard), and the average value was taken as the evaluation value.

  Each stretchable sheet is provided with two nonwoven fabrics as the first layer 62a and the second layer 62b, and the surface of one nonwoven fabric is spaced in the MD direction (line flow direction) during the production of the nonwoven fabric. A hot melt adhesive is applied so as to extend linearly in the CD direction (direction orthogonal to the MD direction) at the time of manufacturing, and an elongated elastic elastic member 63 as a gather elastic elastic member 63 is formed on the one nonwoven fabric. In the state of being stretched along the MD direction of the one nonwoven fabric, the one nonwoven fabric is arranged in parallel with a space of 63 mm (center spacing) of 5 mm in the CD direction, and the other nonwoven fabric is aligned with one nonwoven fabric from above. The hot-melt adhesive as an adhesive 71 applied to the opposite surface of one nonwoven fabric was bonded to the nonwoven fabric, and the elastic stretch member was fixed to the nonwoven fabric.Therefore, the structure of the stretchable sheet is the same type as that shown in FIG.

As the nonwoven fabric, a polypropylene fiber spunbond nonwoven fabric having a fiber diameter of 15 μm, a weight per unit area of 13 g / m ² , and a pressure of 0.5 gf / cm ² and a thickness of 0.16 mm was used. Further, as the elastic elastic member, synthetic thread rubber having a thickness of 620 dtex was used, and the elongation rate at the time of fixation was 240%. The amount of hot melt adhesive applied (weight per unit area of the applied portion) was 20 g / m ² .

  As the stretchable sheet, Example 1 in which the width (stretching direction) of the bonded portion 70 by hot melt adhesive was 2 mm, and the interval 70d between the adjacent bonded portions 70 was 6 mm, the width 70w of the bonded portion was 5 mm, adjacent. Three types were produced: Comparative Example 1 in which the interval 70d between the matching bonded portions was 1 mm, and Comparative Example 2 in which the width 70w of the bonded portion 70 was 5 mm and the interval 70d between the adjacent bonded portions 70 was 10 mm. In the measurement of the bending resistance, each stretchable sheet has a natural length state as shown in FIG. 15 in which the nonwoven fabric has a 20 mm MD direction, 150 mm CD direction test piece I, and a natural length state as shown in FIG. Two types of test pieces II having a dimension of 150 mm in the MD direction and 20 mm in the CD direction of the nonwoven fabric were cut out and the bending resistance was measured in a natural length state.

  The test and evaluation results are shown in Table 1. From the comparison between Example 1 and Comparative Examples 1 and 2, when the width 70w in the expansion / contraction direction of each joint processing portion 70 and the interval 70d between adjacent joint processing portions 70 are within the scope of the present invention, the touch is flexible. It has been found that the rigidity is high while the deterioration in follow-up deformability is small.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

  -"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 “crepe rate” of crepe paper means the elongation rate when wet, measured as follows. That is, a sample having a dimension of 100 mm in the MD direction × 25 mm in the CD direction (MD direction, CD direction is a direction during paper manufacture) is cut out from the test piece. After wetting the sample with a brush wet with water, pull it in the MD direction to the extent that it does not break and stretch the heel. After removing excess moisture from the sample, the length in the MD direction is measured. The crepe rate (elongation rate) is calculated by the following formula.
Crepe rate = {(length after stretching) −100} / 100 × 100

  The present invention can be used for absorbent articles in general, such as pants-type disposable diapers as in the above examples, tape-type and pad-type disposable diapers, sanitary napkins, etc. Is.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious sheet, 12 ... Exterior body, 12A ... Side seal part, 12H ... Second sheet material, 12S ... First sheet material, 12r ... Folded part, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... absorber, 58 ... packaging sheet, 60 ... solid gather, 62 ... gather sheet, 62a ... first layer, 62b ... second layer, 63 ... gather elastic elastic member, 65 ... root portion, 66 ... projection A part, 67 ... Lodging part, 68 ... Free part, 70 ... Joining process part, 71 ... Adhesive, 80 ... Saddle, 200 ... Interior body.

Claims (9)

An absorbent body, a liquid-permeable top sheet and a liquid-impermeable sheet that respectively cover the front side and the back side of the absorbent body, and three-dimensional gathers extending along the front-rear direction on both sides in the width direction,
The three-dimensional gather has a gather sheet having a multi-layer structure, and an elongated gather elastic elastic member fixed along the front-rear direction between layers of the gather sheet.
The gather sheets are provided at the root portion fixed to the side portion of the absorbent article, the protruding portion protruding from the root portion, and the front and rear end portions of the protruding portion, respectively, on the surface of the main body portion in the lying state A fixed lodging part, and a non-fixed free part located between the front and rear lodging parts of the projecting part,
The gather elastic elastic member is fixed in a stretched state in the front-rear direction to at least the tip of the free part in the gather sheet.
In absorbent articles;
In the gather sheet, the first layer and the second layer respectively located on one side and the other side of the gather elastic elastic member intersect with the gather elastic elastic member intermittently arranged in the front-rear direction. Joined by an adhesive or welding process, a joined part is formed,
The gather elastic elastic member is fixed to at least one of the first layer and the second layer at a position intersecting with the joining portion;
As the first elastic layer and the second layer contract as the elastic elastic member contracts, the portions of the first layer and the second layer that are located between the bonded portions swell in opposite directions to form wrinkles. Being
An absorbent article characterized by the above.   The absorptive article according to claim 1 whose width of the expansion-contraction direction of each joined processing part is 4 mm or less, and the interval of adjacent joined processed parts is 4-8 mm. The gather elastic elastic member is provided on the distal end side of the free portion with a plurality of intervals.
The absorptive article according to claim 1 or 2 whose interval of adjacent gather elastic elastic members in these gather elastic elastic members is 10 mm or less. Wherein each of the first and second layers, thickness 0.1 to 1 mm, a nonwoven fabric having a basis weight of 10 to 20 g / m ^2, the absorbent article according to any one of claims 1 to 3.   The absorptive article according to any one of claims 1 to 4 whose extension rate of said gather elastic elastic member in the state where said solid gathers were fully extended is 150 to 350%.   The protruding portion of the gather sheet has a base end portion that extends toward the center in the width direction on the front surface side, and a tip end portion that is folded back outward in the width direction from the tip of the base end portion. The absorbent article according to any one of claims 1 to 5.   The absorptive article according to any one of claims 1 to 6 in which said joined processing part is continuing along a direction inclined with respect to a direction perpendicular to said gather elastic elastic member.   The absorption according to any one of claims 1 to 7, wherein the joining processed portion has a wave shape continuous in a direction orthogonal to the gather elastic elastic member while reciprocating in a direction along the gather elastic elastic member. Sex goods.   The absorptive article according to any one of claims 1 to 8 in which said joined processing part is spaced apart from the tip of said solid gathers to the base end side.