JP2008188050A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the phenomenon that an absorbent on the back side is bent in a chevron shape and swollen to the outer side. <P>SOLUTION: In the pants type disposable diaper, a belly-side covering sheet 12F and a back-side covering sheet 12B are not continued and are separated on the crotch side and the back surface of an absorbent main body 20 is positioned at the separated part. The pants type disposable diaper adopts the structure that an elastic flexible member 25 is fixed in the state of being extended along the cross direction at least in the cross direction range from a part within a rear end part 22 to a part within an intermediate part 23 more on the back surface side than an absorption element 50 in the absorbent main body 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pants-type paper diaper in which an exterior sheet is divided into an abdominal side and a back side.

In general pants-type disposable diapers, both sides of the front body and both sides of the back body are joined to form joints on both sides, forming a torso opening and a pair of left and right leg openings. And an absorbent main body fixed in a range from the abdominal side to the crotch and extending to the back side along the center in the width direction of the inner surface, and the wearer's legs are connected to the torso opening It is to be mounted by inserting it into the leg opening through.
In contrast to the type using such an integrated exterior sheet, in recent years, the exterior sheet is divided into two parts, the abdomen and the back, and the abdomen exterior sheet and the back exterior sheet are separated without being continuous on the crotch side. A paper diaper that can be called a two-divided type has been proposed (see, for example, Patent Document 1). The absorbent main body includes a liquid-permeable top sheet disposed on the front surface, a liquid-impermeable sheet disposed on the back side, and an absorbent element that absorbs and holds the liquid disposed therebetween. The back surface of the liquid-impermeable sheet is coated with a nonwoven fabric as necessary. The back surface of the absorbent main body has a front end connected to the inner surface in the width direction center of the ventral exterior sheet, and a rear end connected to the inner surface in the width direction center of the back side exterior sheet. The intermediate part between the two parts is exposed to the outer surface from the separated portion between the ventral exterior sheet and the back exterior sheet on the crotch side.
The two-divided type has advantages in that there are few trims (excess disposal portions) when punching out the leg openings at the time of manufacture, and that each material of the abdominal exterior sheet and the back exterior sheet can be individually selected.
JP 2005-027839 A

However, as shown in FIG. 10, in the conventional two-part diaper, the back side portion is bent into a “<” shape with the portion indicated by the arrow as the apex, and sometimes bulges outward.
Therefore, a main problem of the present invention is to prevent such a bending phenomenon.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
It consists of an abdominal exterior sheet covering the abdominal side of the wearer's waist and a back exterior sheet covering the back side, and a joint between both side edges of the abdominal exterior sheet and both lateral edges of the back exterior sheet. A cylindrical waistline portion formed by joining the joint portion and forming the abdominal exterior sheet and the back exterior sheet apart from each other without being continuous on the crotch side,
The front end is connected to the inner surface in the width direction center of the ventral exterior sheet, and the rear end is connected to the inner surface in the width direction center of the back exterior sheet, between the front end and the rear end. An underpants-type disposable diaper having an absorbent main body that is exposed to the outer surface from a separated portion of the abdominal exterior sheet and the back exterior sheet on the crotch side and covers the abdomen from the back side through the crotch part In
The absorbent main body has a liquid-permeable top sheet disposed on the front surface, a liquid-impermeable sheet disposed on the back surface side, and an absorbent element that absorbs and holds the liquid disposed therebetween. And
On the back side of the absorbent main body of the absorbent main body, the elastic elastic member is fixed in a stretched state along the front-rear direction over at least the front-rear direction range from the part in the rear end part to the part in the intermediate part. ing,
Pants-type paper diaper characterized by that.

(Function and effect)
As a result of intensive studies on the cause of the bending phenomenon, the present inventor has obtained the following knowledge. That is, in the two-part type disposable diaper, the rigidity changes at the boundary between the portion where the back side exterior sheet is laminated and the portion where the absorbent main body is exposed (the latter is less rigid than the former). The phenomenon of bending in a square shape with the boundary as the apex occurred. It has also been found that such a bending phenomenon is likely to occur particularly when the wearer takes a sitting position.
The present invention has been made on the basis of such knowledge, and in particular, on the back side of the absorbent element in the absorbent main body, at least over the range in the front-rear direction from the portion in the rear end portion to the portion in the intermediate portion, the elasticity The elastic member is fixed in a stretched state along the front-rear direction. By providing an elastic expansion / contraction member in this way, the contraction force of the elastic expansion / contraction member acts over a range that crosses the exterior boundary, and that part fits along the body surface, so the conventional bending phenomenon occurs. It becomes difficult to do.

<Invention of Claim 2>
A crotch outer sheet exposed on the outer surface of the product is laminated on the back side of the liquid impermeable sheet in the absorbent main body, and the elastic expansion and contraction is between the liquid impermeable sheet and the crotch outer sheet. The pants-type paper diaper according to claim 1, wherein the member is provided.

(Function and effect)
The structure described in this section is preferable because the above-described bending phenomenon can be prevented, the elastic elastic member is not exposed, the appearance is improved, and the manufacturing is facilitated.

<Invention of Claim 3>
The underpants type according to claim 1, wherein as the elastic elastic member, an elongated elastic elastic member is provided in parallel in the front-rear direction at each of the widthwise center and the widthwise side portions of the absorbent main body. Paper diapers.

(Function and effect)
It is preferable that the elastic elastic member is disposed as described in this section because the bending phenomenon can be effectively prevented over the entire width direction.

<Invention of Claim 4>
The pants-type disposable diaper according to claim 3, wherein a thread rubber having a thickness of 470 to 1000 dtex is fixed as the elongated elastic elastic member at an interval of 10 to 100 mm in the width direction at a stretch rate of 150 to 220%.

(Function and effect)
When the elongated elastic elastic member is arranged as in the invention described in claim 3, it is particularly excellent in the anti-bending performance if it is provided with the thickness, elongation rate, and interval described in this item.

<Invention of Claim 5>
5. The stretch rate of the elongated elastic stretch member provided in the central portion in the width direction is higher than the stretch rate of the elongated elastic stretch members provided on both sides in the width direction. Pants-shaped paper diapers.

(Function and effect)
It is preferable to be configured as described in this section because it not only has excellent anti-bending performance but also improves the fit to the heel part.

<Invention of Claim 6>
The elastic elastic member extends 5 to 180 mm on the rear end side and 5 to 180 mm on the intermediate side with reference to the boundary between the intermediate portion and the rear end portion in the absorbent main body. The underpants type paper diaper of any one of these.

(Function and effect)
By providing it in the range described in this section, the anti-bending performance is particularly excellent.

<Invention of Claim 7>
A crotch outer sheet that is exposed on the outer surface of the product is laminated on the back side of the liquid-impermeable sheet in the absorbent main body, and the crotch outer sheet includes a front end of the absorbent main body and the ventral outer sheet. From the position between the crotch side edge, to the position between the rear end of the absorbent main body and the crotch side edge of the backside exterior sheet, is provided over the front-rear direction range,
A front exterior non-overlapping portion defined as a front-rear direction range from the front end of the absorbent main body to the front end of the crotch outer sheet overlaps the front end of the crotch outer sheet and the crotch side end of the abdominal outer sheet. A front exterior overlapping portion, a rear exterior non-overlapping portion defined as a front-rear direction range from a rear end of the absorbent main body to a rear end of the crotch outer sheet, a rear end portion of the crotch outer sheet, and the back side It has a rear exterior overlap part that overlaps the crotch side end of the exterior sheet,
The number of sheets provided on the back side of the liquid-impermeable sheet is B1 in the intermediate portion, A1 in the front exterior overlap portion and the rear exterior overlap portion, and the front exterior non-overlap portion. The pants-type disposable diaper according to any one of claims 1 to 6, wherein B1 <C1 ≦ A1 when the number of sheets in the rear exterior non-overlapping portion is C1.

(Function and effect)
In the structure as described in this section, since the thickness of the exterior in the front exterior overlap part and the rear exterior overlap part is the largest, the waist of the exterior of this part becomes strong, and the force of the elastic members on both sides is easily transmitted, The absorbent body is pressed firmly against the body, the fit is improved, and the left and right positional shift of the absorbent main body during wearing is less likely to occur. Moreover, since the thickness of the exterior | packing in the intermediate part becomes the thinnest, the contractive force of an elastic elastic member is easy to be transmitted, an absorber is pressed firmly on a body, and fitting property becomes high. Furthermore, the thickness of the exterior part in the front exterior non-overlapping part and the rear exterior non-overlapping part is thinner than the front exterior overlap part and the rear exterior overlap part and thicker than the intermediate part. This is because a certain amount of waist is required even in the front exterior non-overlapping part and the rear exterior non-overlapping part, but the front exterior overlapping part and the rear exterior so as to follow the roundness of the body shape of the upper abdomen and upper buttock This is because it is better not to make the waist stronger than the overlapping part.
On the other hand, with such a structure, since the waist of the exterior changes at a portion where the number of exterior sheets overlaps, a bending phenomenon is likely to be seen particularly at the back portion. Therefore, the present invention is particularly effective in such a structure.

<Invention of Claim 8>
The sheet weight of the sheet provided on the back side of the liquid-impermeable sheet is defined as B2 in the intermediate portion, A2 in the overlapped portion of the front exterior and the overlapped portion of the rear exterior, and the front exterior. The pants-type disposable diaper according to claim 7, wherein the basis weight of the non-overlapping portion and the rear exterior non-overlapping portion is C2, where B2 <C2 ≦ A2.

(Function and effect)
The same effect as that attained by the 7th aspect can be attained.

  As described above, according to the present invention, there is an advantage that the bending phenomenon in which the back-side absorbent body is bent in a dogleg shape and bulges outward can be prevented.

Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings.
<First Embodiment>
1 to 6 show an example of a pants-type paper diaper according to the present invention. In FIG. 1, “front-rear direction” means a direction connecting the abdomen and the back side, “width direction” means a direction orthogonal to the front-rear direction, and “up-down direction” means a waistline direction. It means a direction orthogonal to each other, in other words, a direction connecting the waist opening WO side and the crotch side.
The pants-type disposable diaper 10 includes a ventral exterior sheet 12F that covers the abdominal side of the wearer's waist, and a back exterior sheet 12B that covers the back side. The joining portion 12A and the joining portion 12A on both side edges in the width direction of the backside exterior sheet 12B are configured to be joined by heat sealing or ultrasonic welding to form a cylindrical waistline portion, The ventral exterior sheet 12F and the back exterior sheet 12B are not continuous on the crotch side and are separated. This separation distance Y can be about 150 to 250 mm.
When the back exterior sheet 12B extends below the joining portion 12A as in the illustrated embodiment, the extension is integrally processed by heat sealing or the like in the vertical range including this portion. A welding part can be provided. By providing the extended weld portion, it is possible to prevent the second elongated elastic elastic member 16 from being pulled in the extended portion 14 described later. In this case, considering the ease of breakage of the side portion, the joining portion 12A is generally composed of a collection of small welded portions, and is generally a joining pattern having a low ratio of the welding area in the joining portion 12A. Since it is not necessary to consider the ease of tearing at the welded portion, the second elongated elastic elastic member 16 is surely welded and fixed by increasing the ratio of the welded area of the welded pattern as compared with the joining portion 12A. Also good. Further, the extended welded portion is welded with a curved line at the edge of the collar cover portion 14C, and the second elongated elastic elastic member 16 of the collar cover portion 14C can be prevented from being pulled.
Further, the back surface of the front end portion 21 of the absorbent main body 20 is connected to the inner surface in the width direction of the abdominal exterior sheet 12F at the waist portion, and the absorbent main body 20 is connected to the inner surface in the width direction center of the back side exterior sheet 12B. The back surface of the rear end portion 22 is connected, and the intermediate portion 23 between the front end portion 21 and the rear end portion 22 forms a separation portion Y between the abdominal exterior sheet 12F and the back exterior sheet 12B on the crotch side. Via the outer surface.
As can be seen from FIGS. 5 and 6, the upper opening of the waistline becomes a waist opening WO through which the wearer's torso passes, and the lower edge of the waistline and the absorbent body 20 on both sides in the width direction of the absorbent body 20. The portions surrounded by the side edges are leg openings LO through which the legs pass. In a state where each joint 12A is peeled off and developed, an hourglass shape is formed as shown in FIG. The absorbent main body 20 extends from the back side through the crotch part to cover the abdominal side, and is a part that receives the excrement and absorbs and holds the liquid, and the waistline part is the absorbent main body 20. Is a portion that supports the wearer.

(Girth)
As shown in FIG. 4, the abdominal exterior sheet 12F and the back exterior sheet 12B are formed by laminating two sheets S1, S2 such as non-woven fabrics, and between the sheets S1, S2 in order to improve fit to the waistline. Further, elongated elastic elastic members 15 and 16 such as rubber thread are provided at a predetermined expansion rate. As the nonwoven fabric, various nonwoven fabrics such as a spunbond nonwoven fabric, a melt blown nonwoven fabric, a point bond nonwoven fabric, an air-through nonwoven fabric, an air point nonwoven fabric, a spunlace nonwoven fabric, and an SMS nonwoven fabric made of fibers of PP, PP / PE, PP / PET, etc. are used. be able to.
More specifically, the back-side exterior sheet 12B has a main body portion 13 that occupies the same vertical range as the joint portion 12A, and an extending portion 14 that extends below the main body portion 13. The extending portion 14 includes a width direction central portion 14M that overlaps the absorbent main body 20, and a buttock cover portion 14C that extends to both sides thereof.
Although the shape of the extension part 14 can be determined as appropriate, in the illustrated example, the upper end part of the extension part 14 has the same width as the main body part 13 and extends below the main body part 13. The width is narrowed toward the crotch side. A portion having the same width as the main body 13 can be omitted. If comprised in this way, the edge 14e of the width direction outer side of the buttock cover part 14C will come in the shape of a straight line or a curve which approaches the absorptive main body 20 side as it approaches the crotch side, and covers the buttock part. Easy shape. Although the dimension of the extension part 14 can be determined suitably, the width direction length 14x of the collar part cover part 14C (the maximum in the width direction between the edge 14e in the width direction outside of the collar part cover part 14C and the side edge of the absorbent main body 20) It is more preferable that the separation distance is 80 to 160 mm, and the length 14y (extension length) in the vertical direction of the collar cover portion 14C is 30 to 80 mm. Further, when the area of a quadrangle determined by the widest part in the width direction of the extension part 14 and the widest part in the vertical direction is S, the area of the extension part 14 is 20 to 80% with respect to S, particularly 40 to 60. It is preferable for it to be about% because the outer appearance and wearing feeling of the buttocks are excellent.
The main body 13 can be conceptually divided into an upper part (waist part) W and a lower part U in the vertical direction, and the range varies depending on the size of the product. Can be 15-80 mm, and the length of the lower portion U in the vertical direction can be 35-220 mm.
In the upper part (waist part) W of the main body part 13, a plurality of waist elastic elastic members 17 are vertically spaced along the width direction at a predetermined extension rate so as to be continuous over the entire width direction. It is fixed in a stretched state. Moreover, about the 1 or several arrange | positioned by the area | region adjacent to the lower part U of the main-body part 13 among the waist elastic elastic members 17, you may overlap with the absorber 20, or an absorptive main body 20 may be provided on both sides in the width direction except for the central portion in the width direction which overlaps with 20. The elastic waist member 17 has a thickness of 300 to 2000 dtex, particularly about 400 to 1900 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.1 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, an extension ratio 200 to 400%, preferably fixed in particular about 220-320%. Moreover, the waist part elastic expansion / contraction member 17 does not need to have the same thickness and expansion ratio, and the thickness and expansion ratio of the elastic expansion / contraction member may be different between the upper part and the lower part of the waist part, for example. The waist elastic elastic member 17 can be freely determined regardless of the size of the first and second elongated elastic elastic members 15 and 16.
Further, in the lower portion U of the main body portion 13, a plurality of first portions are provided so as to be continuous over the entire width direction on each of the upper side and both sides in the width direction except for the central portion in the width direction overlapping the absorbent main body 20. One elongated elastic expansion / contraction member 15 is fixed in a state where it is extended along the width direction at a predetermined extension rate with an interval in the vertical direction. The vertical disposition range of the first elongated elastic elastic member 15 may be a part of the main body 13, but it is preferable that the first elongated elastic elastic member 15 is substantially the whole (a range in which the elastic force acts on the whole).
The first elongated elastic elastic member 15 has a thickness of 300 to 1200 dtex, particularly about 400 to 1000 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.1 to 1.0 mm ² , particularly 0.1. the rubber thread ~0.8mm about ^2), 5 to 30 present approximately at intervals of 3 to 8 mm, at an extension rate of 150 to 300%, preferably fixed in particular about 240-300%.
Moreover, in the extension part 14, except for the width direction center part which overlaps with the absorptive main body 20, it is continuous to each site | part of the width direction both sides over the whole width direction (at least over the whole collar cover part 14C), A plurality of second elongated elastic elastic members 16 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. The vertically elongated arrangement range of the second elongated elastic expansion / contraction member 16 may be a part of the extended portion 14, but is preferably substantially the whole (the range in which the expansion / contraction force acts on the whole).
The second elongated elastic elastic member 16 has a thickness of 300 to 1200 dtex, particularly about 400 to 1000 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.1 to 1.0 mm ² , particularly 0.1. ˜0.8 mm ² ) of the rubber thread in the range of about 3 to 10 at intervals of 3 to 8 mm and an elongation ratio of 240 to 400%, particularly 280 to 360%, than the first elongated elastic elastic member. Each is preferably fixed at a high elongation rate. In addition, it is preferable that the second elongated elastic elastic member 16 is set to have a higher expansion rate than that of the intermediate portion, which is disposed at both ends in the vertical direction. Further, the thickness of the second elongated elastic elastic member 16 is preferably the same as that of the first elongated elastic elastic member 15, but may be thicker or thinner. it can. The waist elastic elastic member 17 and the elongated elastic elastic members 15 and 16 may be made of synthetic rubber or natural rubber.
In this way, when the expansion rate of the second elongated elastic elastic member 16 is higher than the expansion rate of the first elongated elastic elastic member 15, as shown by a white arrow in FIG. Since the diagonally upward force connecting the crotch side and both joints 12A with respect to the portion 14C is more strongly generated at a deeper angle θ, the heel portion cover 14C is unlikely to swell and swell, and the fit is improved. It becomes good. When configuring the abdominal exterior sheet 12F and / or the back exterior sheet 12B, adjusting the tension of the nonwoven fabrics S1 and S2 in the width direction so that the tension of S2 is greater than S1, so that the buttock cover The portion 14C is curled inward, and the fit of the heel portion is further improved.
On the other hand, the abdominal exterior sheet 12F is basically the same as the main body 13 of the back exterior sheet 12B, has a rectangular shape extending along the waistline direction, and extends like the back exterior sheet 12B. The part 14 is not provided. Therefore, the same reference numerals are used and description thereof is omitted. The ventral side exterior sheet 12F can also be configured by a main body part and an extension part similar to the back side exterior sheet 12B.
On the other hand, as shown in the figure, the first and second elongated elastic elastic members 15 and 16 are provided on both sides in the width direction except for the central portion in the width direction, which overlaps the absorbent main body 20, respectively. In addition to the configuration in which elastic elastic members exist only on both sides in the width direction, the elastic elastic members exist from one side of the width direction to the other side across the absorbent main body 20, but the width direction center overlapping the absorbent main body 20 Also included is a configuration in which the elastic stretchable member is cut at the portion so that the stretchable force does not act (substantially equal to not providing the elastic stretchable member). Moreover, in this invention, the 1st and 2nd elongate elastic expansion-contraction members 15 and 16 are crossed across the absorptive main body 20 so that a stretching force may act on the whole width direction of the main-body part 13 and the extension part 14. FIG. It can also be provided from one side in the width direction to the other side.
Since the second elongated elastic elastic member 16 is not welded to the sheets S1 and S2 by the joint portion 12A on the side edge unlike the first elongated elastic elastic member 15, the first elongated elastic member 16 is particularly suitable. In the case where the expansion rate is higher than that of the elastic member 15, it is desirable to take measures to prevent the second elongated elastic elastic member 16 from being pulled in. For this reason, for example, the adhesive strength can be improved by directly applying an adhesive to the second elongated elastic expansion / contraction member 16, but if the amount of the adhesive used increases, the texture of the expansion / contraction part may decrease. For this reason, as described above, it is one of preferable means to provide an extended weld portion extending from the joint portion 12A.
Further, in the configuration in which the second elongated elastic elastic member 16 is cut at the central portion in the width direction overlapping the absorbent main body 20 as described above so that the elastic force does not act, the second elongated It is preferable that the same pull-in prevention treatment is also applied to the end portion in the center in the width direction of the elastic elastic member 16. For example, in the case where the end portions are welded, the second elongated elastic elastic member is formed by a substantially linear welding line arranged so as to vertically cut the second elongated elastic elastic members 16 arranged in the width direction. 16 and the sheets S1 and S2 may be fixed by welding.
In addition, the bonding strength between the second elongated elastic member 16 and the sheets S1 and S2 may be improved by using a fixing method by sheet welding described later alone or in combination with the above method.

(Absorbent body)
The absorptive main body 20 can take any shape, but is rectangular in the illustrated form. As shown in FIG. 3, the absorbent main body 20 includes, in order from the use surface side, a top sheet 30 made of, for example, a nonwoven fabric that allows liquid to pass through, and an absorbent element 50. In a normal case, a liquid-impermeable sheet 70 made of a plastic sheet or the like is provided on the back side of the absorbent element 50. A crotch outer sheet 12 </ b> M is provided on the back side of the liquid-impermeable sheet 70. In addition, an intermediate sheet (second sheet) 40 can be 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. Furthermore, in order to prevent excrement from leaking on both sides of the absorption part 20, barrier cuffs 60, 60 standing on both sides of the absorption part 20 can be provided. In addition, although not shown in figure, each structural member of the absorptive main body 20 can be mutually fixed by solid, beads, spiral application, etc., such as a hot-melt-adhesive.
The absorptive main body 20 can also be detachably connected to the ventral exterior sheet 12F and / or the back exterior sheet 12B using a mechanical fastener or an adhesive material.

(Top sheet)
The top sheet 30 has a property of transmitting liquid. Therefore, the material of the top sheet 30 is sufficient if it exhibits this liquid permeability, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet. 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 you want flexibility and drapeability, the spunbond method, spunlace method, bulkiness, if you want softness, air-through method, point bond method, thermal bond method is a preferred processing method Become.
The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

(Intermediate sheet)
In order to make the liquid which permeate | transmitted the top sheet 30 transfer to an absorber rapidly, the intermediate | middle sheet | seat 40 normally called a "second sheet | seat" whose liquid permeation | transmission speed is faster than the top sheet 30 can be provided. 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, pulp nonwoven fabric, a mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric and a spunbond nonwoven fabric are preferable.
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. A typical material of the intermediate sheet 40 is a nonwoven fabric having excellent liquid permeability.

(Liquid impervious sheet)
The liquid-impermeable sheet 70 simply means a sheet disposed on the back surface side of the absorber 56, and in the present embodiment, is a sheet in which the absorber 56 is interposed between the top sheet 30. Therefore, the material of the liquid impermeable sheet is not particularly limited. Specifically, for example, an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, a nonwoven fabric that substantially ensures liquid impermeability by interposing a waterproof film (in this case, A liquid-impermeable sheet is comprised with a waterproof film and a nonwoven fabric.) Etc. can be illustrated. Of course, in addition to this, materials having liquid impermeability and moisture permeability, which have been used and used in recent years from the viewpoint of preventing stuffiness, can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given. In addition, non-woven fabric using micro-denier fiber, strengthening leak-proofing by reducing the voids of the fiber by applying heat or pressure, and applying water-absorbing resin or hydrophobic resin or water repellent. A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 70.
The liquid impervious sheet 70 can prevent side leakage of the liquid by extending it to the use surface in a so-called forehead winding form (not shown). However, in the embodiment, the barrier cuff is about the side leakage. This is prevented by interposing the second liquid-impermeable sheet 72 between the double barrier sheets 64 forming the layer 60. According to this embodiment, since the second liquid-impermeable sheet 72 extends until the barrier cuff 60 stands up, the liquid diffused laterally along the top sheet 30 and the side of the soft stool between the barrier cuffs 60, 60 are arranged. There is also an advantage that leakage can be prevented.
Moreover, you may give the design by printing or coloring to the inner surface or outer surface of a liquid-impermeable sheet. Further, a printed or colored design sheet, which is a separate member from the crotch outer sheet, may be attached to the outside of the liquid-impermeable sheet. Moreover, you may provide the indicator which displays urination by a visual change inside a liquid-impermeable sheet | seat.

(Barrier cuffs)
Barrier cuffs 60, 60 provided on both sides of the product are provided to prevent urine and soft stool that travel laterally along the top sheet 30 and prevent side leakage. It is.
The illustrated barrier cuff 60 is formed by duplicating a barrier sheet 64 such as a water-repellent nonwoven fabric, and covers the folded portion from the back surface side of the absorbent element 50 to the lower side of the top sheet 30 and protrudes to the front surface side. It is formed to do. In order to prevent urine from moving laterally on the top sheet 30, a second liquid-impermeable sheet 72 is interposed between the double barrier sheets 64 forming the barrier cuff 60. Although not shown, the side part of the liquid-impermeable sheet 70 may be inserted between the double barrier sheets 64 and extended to the middle of the barrier cuff 60 protruding to the surface side.
The shape of the barrier cuff 60 itself can be designed as appropriate. However, in the example shown in the drawing, an elastic elastic member, for example, a rubber thread 62 is fixed to the tip and middle of the protruding portion of the barrier cuff 60 under stretch, The barrier cuff 60 stands up due to the contraction force in use. As shown in FIG. 3, the middle side rubber thread 62 is positioned on the center side of the front end rubber thread 62, 62 and fixed to the front and rear end parts of the top sheet 30. Is standing obliquely toward the center side, and the tip end portion is inclined obliquely outward from the intermediate portion.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a covering sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The covering sheet 58 can be omitted. Further, in the illustrated embodiment, the holding sheet 80 is provided between the absorber 56 and the back surface side portion (lower part) of the covering sheet 58, but the holding sheet 80 may be omitted.

(Absorber)
As the absorbent body 56, in addition to the fiber piled with short fibers such as cotton-like pulp, those made of aggregates of filaments 52, 52.
The aggregate of filaments 52, 52... Can be obtained by opening a tow (fiber bundle). Examples of tow fibers include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactamamide, polyvinyl acetate, etc.). In particular, cellulose esters and cellulose are preferable.
As cellulose, cellulose derived from plants such as cotton, linter, and wood pulp, bacterial cellulose, and the like can be used. Regenerated cellulose such as rayon may be used, and the regenerated cellulose may be a spun fiber.
Examples of cellulose esters that can be suitably used include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; mixed acid esters such as cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, and cellulose nitrate acetate. And cellulose ester derivatives such as polycaprolactone-grafted cellulose ester can be used. These cellulose esters can be used alone or in admixture of two or more. The viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800. The average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).
The average degree of polymerization of the cellulose ester can be, for example, 10 to 1000, preferably 50 to 900, more preferably about 200 to 800, and the average degree of substitution of the cellulose ester is, for example, about 1 to 3, preferably 1 to 1. 2.15, more preferably about 1.1 to 2.0. The average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.
As the cellulose ester, an organic acid ester (for example, an ester with an organic acid having about 2 to 4 carbon atoms), particularly cellulose acetate is suitable. The degree of acetylation of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability. A particularly preferred cellulose ester is cellulose diacetate.
The tow constituent fiber may contain various additives such as a heat stabilizer, a colorant, an oil agent, a yield improver, a whiteness improver, and the like.
The fineness of the tow constituting fiber is, for example, 1 to 16 denier, preferably 1 to 10 denier, and more preferably 1 to 6 denier. The tow constituent fiber 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. When crimped fibers are used, a bulky and light absorbent body can be produced, and a tow with high unity can be easily produced by entanglement between the fibers. The cross-sectional shape of the tow constituting fiber is not particularly limited, and may be any one of, for example, a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. Also good. The tow constituting fibers are used in the form of tows (fiber bundles) formed by bundling, for example, about 1,000 to 1,000,000, preferably about 2,000 to 1,000,000 single fibers. can do. The fiber bundle is preferably formed by bundling about 1,000 to 1,000,000 continuous fibers.
Cellulose diacetate tow bales that can be suitably used in the present invention are commercially available from Celanese and Daicel Chemical Industries. Cellulose diacetate tow bale has a density of about 0.5 g / cm ³ and a total weight of 400-600 kg. From this bale, the tow is peeled off and spread into a wide band so as to have a desired size and bulk. The opening width of the tow is arbitrary, and can be, for example, a width of 50 to 2000 mm, preferably about 50 to 300 mm, which is the width of the product absorber. Moreover, the density of an absorber can be adjusted by adjusting the degree of tow opening.
Preferably, as shown in FIG. 3, superabsorbent polymer particles 54, 54. It is desirable that at least in the liquid receiving region, the superabsorbent polymer particles (SAP particles) are dispersed substantially throughout the thickness direction with respect to the aggregate of the filaments 52, 52. The state of being substantially dispersed throughout the thickness direction is conceptually shown as an enlarged view of the main part of FIG.
If there is no SAP particle in the upper part, the lower part, and the middle part of the absorber 56, or if there is very little, it cannot be said that the "absorbed throughout the thickness direction". Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper, lower, and / or middle portions of the aggregate of filaments, in addition to the form“ uniformly ”distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. Further, a form in which some SAP particles do not enter the aggregate of the filaments 52, 52... Remain on the surface, and some SAP particles pass through the aggregate of the filament filaments 52, 52. The form on the sheet 58 and the form on the holding sheet 80 are not excluded.

(Superabsorbent polymer particles)
The superabsorbent polymer particles 54 include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles 54 can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. Examples of the superabsorbent polymer particles 54 include starch-based, cellulose-based and synthetic polymer-based polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose. A cross-linked product or an acrylic acid (salt) polymer can be used. The shape of the superabsorbent polymer particles 54 is preferably a granular material that is usually used, but other shapes can also be used.
As the superabsorbent polymer particles 54, those having a water absorption speed 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.
Moreover, as the superabsorbent polymer particles 54, 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 54 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 . By setting the basis weight of the polymer to 50 g / m ² or less, it is possible to prevent the lightening effect from being hardly exhibited by adopting the synthetic continuous fiber due to the weight of the polymer. If it exceeds 350 g / m ² , not only will the effect be saturated, but an excessively high superabsorbent polymer particle 54 will give a sense of incongruity.
If necessary, the superabsorbent polymer particles 54 can adjust the spray density or spray 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.
If necessary, as the superabsorbent polymer particles 54, a plurality of particles having different particle size distributions are prepared, sequentially supplied in the thickness direction, those having a small particle size distribution on the lower side in the absorber 56, and particles having a large particle size distribution on the upper side. Things can be distributed.
The ratio between the superabsorbent polymer particles 54 and the continuous fibers determines the absorption characteristics. As a weight ratio in a planar area of 5 cm × 5 cm in a region directly receiving the liquid in the absorbent body 56, it is desirable that the superabsorbent polymer particle / continuous fiber weight is 1 to 14, particularly 2 to 9.

(Enveloping sheet)
When the covering 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 SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .
As shown in FIG. 3, the covering sheet 58 covers not only the form of the aggregate of continuous fibers 52, 52... And the entire layer of superabsorbent polymer particles 54, 54. It may be encapsulated. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials becomes a component of the covering sheet). If necessary, the aggregate of continuous fibers 52, 52... And the layer of superabsorbent polymer particles 54, 54... May be sandwiched between two upper and lower sheets or disposed only on the lower surface. This is not a desirable form because it is difficult to prevent the movement of particles.

(Holding sheet)
In the case where the holding sheet 80 is provided, the superabsorbent polymer particles 54 can be interposed between the holding sheet 80 and the absorbent body 56 by spraying or the like. The superabsorbent polymer particles 54 may pass through the aggregate of continuous fibers 52 at the time of supply to the aggregate of continuous fibers 52 or in a subsequent process, or in a distribution process until use by a consumer. The unevenness of the superabsorbent polymer particles that have passed through the aggregate of continuous fibers gives a sense of incongruity when touched by the hand when the consumer uses it. Therefore, it is also a preferable form that a holding sheet 80 having a holding performance of the superabsorbent polymer 54 is interposed between the absorbent body 56 and the covering sheet 58. The holding sheet 80 reinforces the stiffness that is not sufficient only by the covering sheet 58 such as tissue paper (crepe paper), and reduces or prevents a sense of incongruity when touched by the hand when the consumer uses it.
The material of the holding sheet 80 is not particularly limited as long as it has a holding performance of the superabsorbent polymer 54. Specifically, for example, non-woven fabric, crimped pulp, low-absorbency cotton fiber (for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with a water repellent or a hydrophobizing agent, etc.). ), Polyethylene fiber, polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber and the like.
If the holding sheet 80 and the nonwoven fabric, its holding sheet 80, the compression energy 0.01~10.00gfcm / cm ² based on KES test, preferably, at 0.01~1.00gfcm / cm ^2, and compressed The non-woven fabric has a resilience of 10 to 100%, preferably 70 to 100%.
The reason for providing the holding sheet 80 is to hold, for example, the superabsorbent polymer 54 that has fallen down (dropped out) from the absorbent body 56 as described above. Therefore, since the superabsorbent polymer particles 54 that have come out come into contact with the user via the covering sheet 58 and the holding sheet 80, there is no possibility of being transmitted to the user as a sense of incongruity. In particular, when the nonwoven fabric has the above-described compression energy and compression resilience, its function is sufficiently exhibited.
Further, since the superabsorbent polymer 54 that has slipped out is held by the holding sheet 80 and does not move on the covering sheet 58, there is no possibility of uneven distribution of absorption capacity. In particular, in order to prevent the superabsorbent polymer particles 54 from moving on the holding sheet 80, an adhesive hot melt adhesive or the like can be applied on the holding sheet 80 in advance. Alternatively, the upper surface of the holding sheet 80 (surface toward the use surface side) may be a rough surface to prevent the superabsorbent polymer particles 54 from moving on the holding sheet 80. Examples of the roughening or fluffing means for this purpose include a non-net surface that is not a net surface during the production of the nonwoven fabric, a marble process, a needle punch process, and a brushing process.
As shown in FIG. 3, the holding sheet 80 may be provided only below the absorber 56, or although not shown, the holding sheet 80 may be wound up and extended to the upper surface of the absorber 56 through the side surface of the absorber 56. It is also possible to use a plurality of holding sheets 80 in a stacked manner.
The above example is an example in which the holding sheet 58 is provided between the absorber 56 and the back side portion of the covering sheet 58, but the holding sheet may be on the back side from the covering sheet (the form is shown in the figure). In short, if a holding sheet is provided on the back side with respect to the absorbent body 56, it is possible to reduce or not cause a crisp discomfort when touching from the back side of the product.

(Crotch exterior sheet)
A crotch outer sheet 12 </ b> M exposed to the outer surface of the product is provided on the back side of the absorbent main body 20. As the material of the crotch outer sheet 12M, the same material as the abdominal exterior sheet 12F and the back exterior sheet 12B can be used, but a material containing a higher strength material or a deodorant, etc. A material different from the exterior sheet 12F and the back-side exterior sheet 12B may be used. Specifically, various nonwoven fabrics such as a spunbond nonwoven fabric, a melt blown nonwoven fabric, a point bond nonwoven fabric, an air-through nonwoven fabric, an air point nonwoven fabric, a spunlace nonwoven fabric, and an SMS nonwoven fabric composed of fibers such as PP, PP / PE, and PP / PET, Or what added the deodorizer etc. to this can be used.
A particularly preferred combination is that the outer sheet S1 in the ventral exterior sheet 12F and the back exterior sheet 12B is an SMS nonwoven fabric, the inner sheet S2 is a PP / PE spunbond nonwoven fabric, and the crotch exterior sheet 12M is PP / PE. A combination of spunbond nonwoven fabrics.
A high body pressure is applied to the crotch outer sheet 12M when sitting. Therefore, a material having a high friction fastness (non-fluffing) property is preferable, and in particular, a material that can be evaluated as “◎” or “◯” in the following friction fastness test is preferably used.
(Friction fastness test)
The fastness to friction is measured by the following method in accordance with JIS L 0849. That is, a sheet piece for measuring the friction fastness of 250 mm × 25 mm is prepared, and the friction fastness on the outer surface side (the outer surface side of the absorbent main body) of the measurement sheet piece is measured. For example, COLOR FASTNESS RUBING TESTER (manufactured by Tester Sangyo Co., Ltd., Model: AB-301) can be used for measuring the friction fastness. The measurement is performed using a friction tester type II and applying 50 vibrations. The measurement sheet piece obtained as a result of the test was visually compared with the limit sample, and {◎: No kinking and fluffing ○: No kinking and fuzzing △: With kinking and fuzzing ×: Nonwoven fabric breaks 4 Evaluate in stages.
In the illustrated example, the crotch outer sheet 12M is sandwiched between the absorbent main body 20 and the abdominal and dorsal exterior sheets 12F and 12B where the abdominal and dorsal exterior sheets 12F and 12B and the absorbent main body 20 overlap. However, it can also be affixed to the outside of the ventral and back exterior sheets 12F and 12B. The crotch outer sheet 12M is affixed to the back surface of the absorbent main body 20 and the inner or outer surfaces of the abdominal and back-side outer sheets 12F and 12B with a hot melt adhesive or the like.
Of the back surface of the absorbent main body 20 (in this case, the liquid-impermeable sheet 70), the range in which the crotch outer sheet 12M is provided can be determined as appropriate. In the illustrated example, the front-rear direction range on the back surface of the absorbent main body 20 includes an exterior non-overlapping portion 20F from the front end to a predetermined position on the front end side from the crotch side edge of the abdominal exterior sheet 12F, and the exterior non-overlapping portion 20F. The exterior overlap portion X from the crotch side edge to the crotch side edge of the abdominal exterior sheet 12F, the intermediate portion 23, and the rear end to a predetermined position on the rear end side from the crotch side edge of the abdominal exterior sheet 12F. The exterior non-overlapping portion 20B and the exterior overlapping portion Z from the crotch side edge of the exterior non-overlapping portion 20B to the crotch side edge of the back side exterior sheet 12B are divided, and the crotch exterior sheet 12M is separated from the front exterior It is provided only in the range 20M from the overlapping portion X through the intermediate portion 23 to the rear exterior overlapping portion Z.
The length in the front-rear direction of each part can be determined as appropriate. In particular, the longitudinal length of the exterior overlapping portion X where the front end of the crotch outer sheet 12M and the crotch side end of the abdominal exterior sheet 12F overlap, and the rear end of the crotch outer sheet 12M and the back exterior sheet 12B. The exterior overlapping portion Z where the crotch side end overlaps can be, for example, 0 to 100 mm, more preferably 10 to 80 mm, and particularly preferably 20 to 60 mm. When these overlap margins become excessively large, it is difficult to prevent a decrease in air permeability of the waistline portion. If these overlap margins are excessively small, a desired stiffness cannot be obtained.
In particular, regarding the number of sheets provided on the back side of the liquid-impermeable sheet, the number of sheets in the intermediate portion 23 is B1, the number of sheets in the front exterior overlap portion X and the rear exterior overlap portion Z is A1, and the front exterior When the number of sheets in the overlapping portion 20F and the rear exterior non-overlapping portion 20B is C1, it is preferable that B1 <C1 ≦ A1. As long as this relationship is satisfied, the number of each sheet is not limited, but B1 is preferably 0 or more, particularly preferably 1. A1 is preferably 2 or more in difference from B1, and A1 has an upper limit of 5 sheets. Is preferable. One particularly preferred combination is one for B1, two for C1, and three for A1. The number of overlaps on the front and rear sides can be the same or different. In addition, members that do not affect the rigidity of each part, for example, a post-processing tape having a small area, are not included in these numbers.
In addition, the rice tsubo of the sheet provided on the back side of the liquid-impermeable sheet is B2 in the middle portion 23, and A2 in the front exterior overlap portion X and the rear exterior overlap portion Z. It is preferable that B2 <C2 ≦ A2 when the basis weight of the exterior non-overlapping portion 20F and the rear exterior non-overlapping portion 20B is C2. Each rice basis weight is not limited as long as this relationship is satisfied, but B2 is preferably 0 to 25 g / m ² , C2 is preferably 10 to 50 g / m ² , and A2 is preferably 15 to 75 g / m ² .
On the other hand, in the example shown in FIGS. 1 to 6, the crotch outer sheet 12M is formed to have the same width as the absorbent main body 20, in other words, both side edges (both ends in the width direction) of the crotch outer sheet 12M are absorbent. It is fitted to both side edges (both ends in the width direction) of the main body 20. If comprised in this way, the predetermined front-back direction range 20M in the back surface of the absorbent main body 20 is covered with the crotch outer sheet 12M over the entire width direction, and the crotch outer sheet 12M does not protrude from the absorbent main body 20. For this reason, the appearance in the crotch part is clean. However, the width of the crotch outer sheet 12M of the present invention is not limited to this, and the entire crotch outer sheet 12M in the front-rear direction (or a part thereof) is formed wider than the absorbent main body 20. be able to. Although how much the width | variety of the crotch part exterior sheet | seat 12M is expanded with respect to the absorptive main body 20 can be determined suitably, it can be about 10-60 mm (5-30 mm in one side), for example. If comprised in this way, since the crotch outer sheet | seat 12M will protrude on the both sides of the width direction of the absorptive main body 20, an elastic expansion-contraction member is arrange | positioned in the part of this both sides, and the fitting property to a leg periphery is improved. The deodorizing performance around the legs can be improved by adding a deodorant to the crotch outer sheet 12M.
On the contrary, the entire front-rear direction (or a part thereof) of the crotch outer sheet 12 </ b> M can be formed narrower than the absorbent main body 20. Although how much the width | variety of the crotch part exterior sheet | seat 12M is narrowed with respect to the absorptive main body 20 can be determined suitably, it can narrow about 10-60 mm, for example. In this case, the material cost can be kept low, and the air permeability in the crotch portion is improved.
When the width of the crotch outer sheet 12M is made narrower than the absorbent main body 20, the back surface of the absorbent main body 20 is exposed on both sides in the width direction of the crotch outer sheet 12M depending on the structure. Barrier sheets 64 constituting the cuffs 60 are attached to the both sides of the back surface of the absorbent main body 20 in the width direction by a hot melt adhesive or the like, and both ends in the width direction of the crotch outer sheet 12M are absorbed. Since each end of the barrier sheet 64 extending to both sides in the width direction of the back surface of the absorbent main body 20 is overlapped with an overlap margin W in a predetermined width direction, the absorbent main body 20 is formed on both sides in the width direction of the crotch outer sheet 12M. The back side of is never exposed.
On the other hand, the crotch outer sheet 12M may be configured so as to cover the entire covering range with one sheet, but the plurality of crotch outer sheets 12M are adjacent to or spaced from at least one of the front and rear direction and the width direction. Can be installed side by side. The plurality of crotch outer sheet 12M may be adjacent to each other. However, if the crotch outer sheet 12M is provided at a predetermined interval, the back surface of the absorbent main body 20 is spread over a wider range while suppressing the amount of material used and improving air permeability. Can be covered. Although this space | interval can be determined suitably, it can be about 5-30 mm normally.

(About elastic expansion and contraction member for buttocks fit)
Characteristically, the elastic elastic member 25 extends along the front-rear direction over the front-rear direction range from the part in the rear end part 22 to the part in the intermediate part 23 on the back side of the absorbent element 50 in the absorbent main body. It is fixed in the stretched state. By providing the elastic expansion / contraction member 25 in this way, the contraction force of the elastic expansion / contraction member 25 acts over a range over the exterior boundary BL, and the portion fits along the body surface. The phenomenon is less likely to occur.
In the illustrated embodiment, an elongated elastic expansion / contraction member such as a rubber thread is employed as the elastic expansion / contraction member 25, but a wide elastic expansion / contraction member such as a belt or a net may be used. The dimensions, stretch ratio, arrangement, and the like of the elastic elastic member 25 can be determined as appropriate so that the bending prevention effect of the present invention is exhibited.
The front-rear direction range 25L (in other words, the front-rear direction range receiving the elastic force of the elastic elastic member 25) where the elastic elastic member 25 is provided can be determined as appropriate. It is preferable that the distance from the position of 5 to 180 mm, preferably 10 to 90 mm on the rear end 22 side to the position of 5 to 180 mm, preferably 10 to 90 mm on the intermediate part 23 side, with respect to BL. If the range 25L in the front-rear direction is too narrow, the effect of preventing bending will be poor, and if it is excessively widened, the effect of preventing bending will remain unchanged, but this is not preferable because it deteriorates the appearance and increases costs.
In a normal case, the elastic elastic member 25 is preferably provided in the front-rear direction range 25L from the position of 5 mm to the position of 180 mm on the back side with reference to the center CL in the front-rear direction of the product. It is preferable not to provide a member. Further, as shown in the example, when the elastic elastic member 25 is sandwiched between the crotch outer sheet 12M, the back side end of the elastic elastic member 25 is separated from the back side end of the crotch outer sheet 12M to the crotch side. The separation distance 25Y is preferably 5 mm or more.
The elastic elastic member 25 may be provided anywhere in the thickness direction as long as it is disposed on the back side of the absorbent element 50. However, in the illustrated example, between the liquid-impermeable sheet 70 and the crotch outer sheet 12M. Only provided. Although not shown, the crotch outer sheet 12M is affixed to the outside of the abdominal and dorsal outer sheets 12F and 12B, and the elastic elastic member 25 is attached to the liquid impervious sheet 70 and the crotch outer sheet 12M at the intermediate part 23. The rear end portion 22 may be configured to be sandwiched between the back side exterior sheet and the crotch portion exterior sheet 12M.
When an elongated elastic elastic member 25 is used as the elastic elastic member 25, the position in the width direction may be determined as appropriate, but only in the width direction center and both sides in the width direction of the absorbent main body 20 as shown in the illustrated example. It is preferable to provide them in parallel along the front-rear direction. Further, when three elongated elastic elastic members 25 are provided in this way, each elastic elastic member 25 is a rubber thread having a thickness of 470 to 1000 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.1 to 0.1). the 1.0mm approximately ^2), in extension ratio of 150 to 220%, 10 to 100 mm in the width direction, preferably in particular to fixed distance D 30 to 70 mm. If the action of the contraction force of the elastic elastic member 25 is insufficient, the bending tends to occur. If the contraction force is too strong, the bending may occur on the contrary. The distance 25D between the elastic elastic member 25 located on both sides in the width direction and both side edges in the width direction of the absorbent main body 20 is preferably 0 to 60 mm, particularly preferably 10 to 40 mm.
Further, when three elongated elastic elastic members 25 are provided in this way, the elongation rate of the elongated elastic elastic members 25 provided at the center in the width direction is set to the elongated elastic elastic members provided at both sides in the width direction. It is particularly preferable that the elongation ratio is higher than 25.
As shown in FIG. 7, the elastic elastic member 25 can also be provided in parallel along the front-rear direction only on both sides in the width direction of the absorbent main body 20. In this case, as each elastic elastic member 25, a thread rubber having a thickness of 470 to 1000 dtex (in the case of synthetic rubber; in the case of natural rubber, a cross-sectional area of about 0.1 to 1.0 mm ² ) is 150 to 220%. It is preferable to fix at an interval D of 20 to 180 mm, particularly 60 to 140 mm in the width direction. In addition, the separation distance 25D between the elastic elastic member 25 located on both sides in the width direction and both side edges in the width direction of the absorbent main body 20 is preferably 0 to 60 mm, particularly preferably 10 to 40 mm.

(Method of fixing elastic elastic member by welding sheets)
The above-described various elongated elastic members (15, 16, 25, etc.) are fixed to an adjacent sheet with an adhesive such as a hot-melt adhesive, and are fixed without impairing air permeability by the following method. Can do.
FIG. 8 shows that the elongated elastic elastic member EL is formed by welding sheets ST and ST for sandwiching the elongated elastic elastic member EL at a predetermined interval in a state where a tensile force is applied to the elongated elastic elastic member EL. Shows a method of fixing by the frictional force between the sheets ST and ST. A symbol M in the figure indicates a welded portion, and a symbol N indicates a non-welded portion. By setting it as such a structure, the elongate elastic expansion-contraction member EL can be firmly fixed, without using an adhesive agent. In addition, since the elongated elastic elastic member EL is not bonded, it is possible to form an expansion / contraction part in which air permeability and softness are ensured. The welding can be ultrasonic welding or heat welding. However, it is more preferable to use ultrasonic welding because the influence of heat and pressure on the elongated elastic elastic member EL and the sheet ST, ST peripheral portion is less than that of the heat welding.
FIG. 9 shows a state where both ends of the elongated elastic elastic member EL in the width direction and the sheets ST and ST are welded at a predetermined interval in a state where a tensile force is applied to the elongated elastic elastic member EL. 3 shows a method in which the elongated elastic expansion / contraction member EL is fixed to the sheets ST and ST by the frictional force with the sheets ST and ST and the adhesive force at the end in the width direction of the elongated elastic expansion / contraction member EL. A symbol M in the figure indicates a welded portion, and a symbol N indicates a non-welded portion. By adopting such a structure, the elongated elastic expansion / contraction member EL is more firmly fixed by the adhesive force at the end in the width direction of the elongated elastic expansion / contraction member EL in addition to the frictional force with the sheets ST and ST. In addition, since adhesion is only the end portion in the width direction of the elongated elastic expansion / contraction member EL, there is no possibility of deterioration or cutting of the elongated elastic expansion / contraction member EL.
The structure in which the elongated elastic elastic member EL is fixed by the frictional force with the sheets ST and ST is a state where both ends of the elongated elastic elastic member EL in the width direction are in a state where a tensile force is applied to the elongated elastic elastic member EL. When the inner layer and the outer layer are intermittently welded in the vicinity of the portion and the elongated elastic expansion / contraction member EL is fixed to the sheets ST and ST, and then the load is removed (no tension), the elongated elastic expansion / contraction member EL The outer diameter of the cross section becomes larger, and a pressing force is applied to sandwich the width direction of the elongated elastic elastic member EL from both sides by the welded portions with the sheets ST and ST. As a result, the elongated elastic elastic member EL is fixed only by the frictional force with the sheets ST and ST without fixing the elongated elastic elastic member EL with an adhesive.

  The present invention can be applied to a pants-type paper diaper that is formed in a pants shape in advance.

It is a top view in the unfolded state which shows the inner surface of embodiment. It is a top view in the unfolded state which shows the outer surface of embodiment. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a sectional view taken along line 4-4 of FIG. It is a front view of a product state. It is a rear view of a product state. It is a rear view which shows the product normal state of other embodiment. It is the schematic which shows the fixing method of the elastic elastic member by welding. It is the schematic which shows the fixing method of the elastic elastic member by welding. It is the photograph which photoed the wearing state of the conventional diaper from the side.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Absorbent main body, 12 ... Exterior sheet, 12F ... Abdominal side exterior sheet, 12B ... Back side exterior sheet, 12M ... Crotch part exterior sheet, 13 ... Body part, 14 ... Extension part, 15 ... 1st elongate shape Elastic elastic member, 16 ... second elongated elastic elastic member, 25 ... elongated elastic elastic member.

Claims (8)

It consists of an abdominal exterior sheet covering the abdominal side of the wearer's waist and a back exterior sheet covering the back side, and a joint between both side edges of the abdominal exterior sheet and both lateral edges of the back exterior sheet. A cylindrical waistline portion formed by joining the joint portion and forming the abdominal exterior sheet and the back exterior sheet apart from each other without being continuous on the crotch side,
The front end is connected to the inner surface in the width direction center of the ventral exterior sheet, and the rear end is connected to the inner surface in the width direction center of the back exterior sheet, between the front end and the rear end. An underpants-type disposable diaper having an absorbent main body that is exposed to the outer surface from a separated portion of the abdominal exterior sheet and the back exterior sheet on the crotch side and covers the abdomen from the back side through the crotch part In
The absorbent main body has a liquid-permeable top sheet disposed on the front surface, a liquid-impermeable sheet disposed on the back surface side, and an absorbent element that absorbs and holds the liquid disposed therebetween. And
On the back side of the absorbent main body of the absorbent main body, the elastic elastic member is fixed in a stretched state along the front-rear direction over at least the front-rear direction range from the part in the rear end part to the part in the intermediate part. ing,
Pants-type paper diaper characterized by that.   A crotch outer sheet exposed on the outer surface of the product is laminated on the back side of the liquid impermeable sheet in the absorbent main body, and the elastic expansion and contraction between the liquid impermeable sheet and the crotch outer sheet. The pants-type paper diaper according to claim 1, wherein the member is provided.   The underpants type according to claim 1, wherein as the elastic elastic member, an elongated elastic elastic member is provided in parallel in the front-rear direction at each of the widthwise center and the widthwise side portions of the absorbent main body. Paper diapers.   The pants-type disposable diaper according to claim 3, wherein a thread rubber having a thickness of 470 to 1000 dtex is fixed as the elongated elastic elastic member at an interval of 10 to 100 mm in the width direction at an elongation of 150 to 220%.   5. The stretch rate of the elongated elastic stretch member provided at the central portion in the width direction is higher than the stretch rate of the elongated elastic stretch member provided at both sides in the width direction. Pants-shaped paper diapers.   The elastic elastic member extends 5 to 180 mm on the rear end side and 5 to 180 mm on the intermediate side with reference to the boundary between the intermediate portion and the rear end portion in the absorbent main body. The underpants type paper diaper of any one of these. A crotch outer sheet that is exposed on the outer surface of the product is laminated on the back side of the liquid-impermeable sheet in the absorbent main body, and the crotch outer sheet includes a front end of the absorbent main body and the ventral outer sheet. From the position between the crotch side edge, to the position between the rear end of the absorbent main body and the crotch side edge of the backside exterior sheet, is provided over the front-rear direction range,
A front exterior non-overlapping portion defined as a front-rear direction range from the front end of the absorbent main body to the front end of the crotch outer sheet overlaps the front end of the crotch outer sheet and the crotch side end of the abdominal outer sheet. A front exterior overlapping portion, a rear exterior non-overlapping portion defined as a front-rear direction range from a rear end of the absorbent main body to a rear end of the crotch outer sheet, a rear end portion of the crotch outer sheet, and the back side It has a rear exterior overlap part that overlaps the crotch side end of the exterior sheet,
The number of sheets provided on the back side of the liquid-impermeable sheet is B1 in the intermediate portion, A1 in the front exterior overlap portion and the rear exterior overlap portion, and the front exterior non-overlap portion. The pants-type disposable diaper according to any one of claims 1 to 6, wherein B1 <C1 ≦ A1 when the number of sheets in the rear exterior non-overlapping portion is C1.   The sheet of paper provided on the back side of the liquid-impermeable sheet has a sheet weight of B2 in the middle part, a sheet weight of the front exterior overlap part and the rear exterior overlap part as A2, and the front exterior. The pants-type disposable diaper according to claim 7, wherein the basis weight of the non-overlapping portion and the rear exterior non-overlapping portion is C2, where B2 <C2 ≦ A2.

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