JP5053832B2 - Disposable diapers - Google Patents

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 recent years, a paper diaper that can be referred to as a two-divided type in which an exterior sheet is divided into an abdomen and a dorsal side has been proposed (see Patent Document 1, for example). . 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.
On the other hand, in the 2-split type, the trim can be completely eliminated, but in that case, there is no portion that covers both sides of the buttock, so that the appearance and the wearing feeling may be deteriorated. Therefore, for the backside exterior sheet, an extension having a widthwise central portion that overlaps the absorbent main body and a buttock cover portion that extends on both sides of the main body occupying the same vertical range as the joint portion. Is provided.
JP 2005-027839 A

However, the conventional device has a problem in that the buttock cover portion in the extending portion swells or swells and looks bad.
Then, the main subject of this invention is to prevent the swelling and the dripping in the lower side extension part of a back side exterior sheet.

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 girth part formed by joining the joint part;
The front end is connected to the inner surface in the width direction central portion of the ventral exterior sheet, the rear end is connected to the inner surface in the width direction central portion of the back exterior sheet, and passes from the back side to the ventral side through the crotch portion. With an absorbent main body covering
In the pants-type paper diaper where the ventral exterior sheet and the back exterior sheet are not continuous on the crotch side and are separated from each other,
The back-side exterior sheet has a back-side main body portion that occupies the same vertical range as the joint portion, and a back-side extension portion that extends below the back-side main body portion,
This back side extension part has the width direction center part which overlaps with the above-mentioned absorptive main part, and the buttock cover part extended to the both sides,
The abdominal exterior sheet consists of only the abdominal body part occupying the same vertical range as the joint part, or the abdominal body part occupying the same vertical range as the joint part, and the lower part of the abdominal body part A ventral extension extending to the side,
Among the upper and lower end portions in the vertical direction of the back side main body portion and the intermediate portion therebetween, the back side waist portion fixed to the upper end portion in a state of being stretched along the width direction at a predetermined stretch rate. A plurality of elastic elastic members are provided at intervals in the vertical direction, and are fixed to at least a portion of the intermediate portion and the lower end portion that does not overlap the absorbent main body in a state of being stretched along the width direction at a predetermined stretch rate. A plurality of first elongated elastic elastic members are provided at intervals in the vertical direction, and are fixed to at least the flange cover portion in a state of being stretched along the width direction at a predetermined stretch rate. A plurality of elongated elastic elastic members are provided at intervals in the vertical direction,
In the belly side exterior sheet, the upper end portion of the ventral side main body portion, the lower end portion, and the intermediate portion therebetween are extended to the upper end portion along the width direction at a predetermined extension rate. A plurality of fixed elastic waist members on the ventral side waist portion are provided at intervals in the vertical direction, and at least a portion that does not overlap the absorbent main body in the middle portion is stretched along the width direction at a predetermined stretch rate. A plurality of third elongated elastic elastic members fixed in a fixed state are provided at intervals in the vertical direction, and at least at a portion that does not overlap the absorbent main body at the lower end portion in the width direction at a predetermined extension rate. A plurality of fourth elongated elastic elastic members fixed in a stretched state are provided at intervals in the vertical direction;
The second elongated resilient and elastic elongation modulus of members rather higher than the expansion rate of the first elongated resilient and elastic members, and the extension ratio of the fourth elongated resilient and elastic members are first elongated resilient and elastic Higher than the elongation of the member,
Pants-type paper diaper characterized by that.

(Function and effect)
In a pants-type disposable diaper that is not a two-part type, a plurality of elongated elastic elastic members are spaced in the width direction at the same stretch rate at intervals in the vertical direction at portions corresponding to the back side main body part and the buttock cover part of the present invention. It is known to fix in a stretched state. In this form, since the entire portion corresponding to the buttock cover portion expands and contracts, it has better fit than forming a gather by arranging elastic elastic members along the legs, and is less likely to swell or sag. The leg can be easily passed. For this reason, although it was thought that the fitting property of the buttock cover portion was improved by adopting the same configuration even in the two-divided type at first, contrary to the expectation, the fitting property of the buttock cover portion is not improved.

  As a result of further research on the cause, the following findings were obtained. That is, when a plurality of elongated elastic elastic members are fixed to the buttock cover part in the two-part split type with a space in the vertical direction and extended along the width direction, both the crotch side and both sides of the buttock cover part are fixed. A diagonally upward force that connects the joints acts. This diagonally upward force is similarly generated regardless of whether it is a two-split type. However, since the two-split type backside exterior sheet does not extend to the crotch, the angle of the force becomes shallower and the strength becomes weaker. As a result, even if it has a similar structure at first glance, it is easy for the roll-up to occur.

  The present invention has been made on the basis of such knowledge, and the second provided in the buttock cover portion is more than the expansion rate of the first elongated elastic elastic member provided in the back main body portion of the backside exterior sheet. It is characterized in that the elongation rate of the elongated elastic elastic member is increased. By configuring in this way, even in the case of the two-part type, the force upward obliquely connecting the crotch side and both joints with respect to the buttock cover portion is more strongly generated at a deeper angle. The fit of the cover part is improved, and it is difficult for the cover part to rise and bulge.

Moreover, the 4th elongate elastic expansion-contraction member in the ventral | abdominal exterior sheet | seat is located on the extended line of the direction (diagonal upper direction) which goes to both joint parts from the crotch side in a buttock cover part. Thus, as in the present invention , the first elongated elastic elastic member is arranged on the back side so that the expansion rate of the fourth elongated elastic elastic member corresponds to the fourth elongated elastic elastic member on the abdomen side. If it is higher than the expansion ratio, the force that pulls the buttock cover portion obliquely upward acts, so that the heel portion cover portion is more unlikely to swell and swell.

<Invention of Claim 2 >
The magnitude relationship between the stretch rates of the first to fourth elongated elastic elastic members is as follows:
Fourth elongated elastic elastic member ≧ second elongated elastic elastic member> first elongated elastic elastic member ≧ third elongated elastic elastic member,
The pants-type paper diaper according to claim 1, wherein:

(Function and effect)
When configured in this manner, the force of pulling up the buttock cover portion obliquely upward works more effectively, so that the fit of the buttock cover portion is improved and the effect of the present invention is less likely to swell and swell. It will be even more.

<Invention of Claim 3 >
The back waist portion elongated elastic stretch member, the ventral waist portion elongated elastic stretch member, the first elongated elastic stretch member, so that the joint tilt angle in the joint tilt test is 20 degrees or less, Number, thickness, stretch rate, spacing, material type, and vertical direction of each of the second elongated elastic elastic member, the third elongated elastic elastic member, and the fourth elongated elastic elastic member The pants-type paper diaper according to claim 1 or 2 , wherein the arrangement is defined.

(Function and effect)
Moreover, in the conventional diaper, as shown in FIG. 9, a phenomenon occurs in which the joining portion 12A of the back side exterior sheet 12B and the abdomen side exterior sheet 12F is shifted to the back side toward the lower end side during use. It was also found that bulges and wrinkles occurred in the buttock cover.
As a result of further research, this phenomenon occurs in close association with the expansion and contraction characteristics of each part of the diaper, and the main cause is the joining force due to the contraction force of the elongated elastic expansion and contraction member provided on the buttock cover. The contraction force balance between the abdominal side and the dorsal side at the border was lost, and the contraction force toward the dorsal side was strongly acting toward the lower end side of the joint.

  The invention described in this section is made based on such knowledge, and the number, thickness, and thickness of each elongated elastic elastic member so that the joint inclination angle in the joint inclination test is 20 degrees or less. The expansion rate, the interval, the type of material, and the vertical arrangement are defined. By configuring in this way, it is possible to effectively prevent swelling and swelling in the buttock cover portion while maintaining the advantages of the two-split type.

  The joint inclination test measures the inclination angle of the joint as follows. That is, first, as shown in FIG. 10 (a), only the waistline portion 12 from which the absorbent main body is removed from the disposable diaper is prepared as a specimen, and this specimen 12 is the center line in the product width direction of the ventral-side exterior sheet 12F. Further, the center line in the product width direction of the back side exterior sheet 12B is folded and folded so that the inner surfaces overlap each other, and the base line L1 (the edge on the center side in the width direction of the joint 12A) of both joints 12A is overlapped. Like that. Next, the specimen 12 in the folded state is sandwiched by one chuck C1 of the tensile tester over the entire product vertical direction over a range of 10 mm from one fold line to the joint side, and 10 mm from the other fold line to the joint side. The range is sandwiched by the other chuck C2 of the tensile tester over the entire product vertical direction, and a tensile test is performed along the product longitudinal direction indicated by the arrows. The distance between chucks (the length during natural contraction) when the specimen 12 is naturally contracted without being pulled is defined as A, and the distance between chucks when the specimen 12 is stretched without contraction by the elastic elastic member (at the time of maximum extension). When the length is B, the upper and lower ends of the joint base line L1 with respect to the vertical direction of the product when the distance between chucks is (A + B) / 2 as shown in FIG. The inclination angle θ1 of the connecting virtual line L2 is measured using a protractor, and this is defined as the joint inclination angle.

<Invention of Claim 4 >
The magnitude relationship of the shrinkage force in the width direction acting on each part of the exterior sheet is
Lower end portion of the ventral body portion ≧ the back side extension portion> intermediate portion and lower end portion of the back side body portion ≧ intermediate portion of the ventral body portion,
The pants-type paper diaper according to claim 3, wherein

(Function and effect)
When configured in this way, the balance of the contraction force between the abdomen and the dorsal side at the junction is balanced, the junction inclination angle in the junction inclination test is 20 degrees or less, and On the other hand, the diagonally upward force connecting the crotch side and both joints is strongly generated at a deep angle, so the fit of the buttock cover part is further improved, and the swelling and swelling of the buttock cover part are more effectively prevented become able to. In addition, regarding the “intermediate portion and lower end portion of the back side main body portion” in the above-described size relationship, each has a contraction force smaller than that of the back side extension portion and has a contraction force greater than that of the middle portion of the abdominal side main body portion. And

<Invention of Claim 5 >
The pants according to any one of claims 1 to 4 , wherein at least an upper end portion of the back side extension portion has the same width as the back side main body portion and extends below the back side main body portion. Patterned diapers.

(Function and effect)
If comprised in this way, the area (width | variety) of a collar part cover part can be expanded, reducing a trim amount. In this case, a portion having the same width as that of the back side main body portion is likely to bend, but in the present invention, such a wide portion can be effectively prevented.

<Invention of Claim 6 >
The disposable diaper according to any one of claims 1 to 5 , wherein an edge on the outer side in the width direction of the buttock cover portion is linear or curved so as to approach the absorbent main body as it approaches the crotch side. .

(Function and effect)
It is preferable that the edge on the outer side in the width direction of the buttock cover portion has such a shape because it is easy to cover the heel portion and it is difficult for wrinkles to occur. On the other hand, when the shape of the buttocks cover portion is a square, the appearance shape is not good.

<Invention of Claim 7 >
The length of the width direction of the said buttock cover part is 80-160 mm, and the length of the vertical direction of the said buttock cover part is 30-80 mm, The underpants type paper diaper of Claim 6 .

(Function and effect)
The collar cover portion having the dimensions described in this section is particularly suitable for the present invention because it is easy to bend.

  As described above, according to the present invention, there are advantages such as prevention of bulging and twisting at the lower extension portion of the back exterior sheet.

Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings.
<First Embodiment>
1 to 5 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 portions 12A on both side edges in the width direction of the backside exterior sheet 12B are joined by heat sealing, ultrasonic welding, or the like, so that the cylindrical waistline portion 12 is formed. 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 extension weld portion, it is possible to prevent the second elongated elastic elastic member 16 from being pulled in the back side extension 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 front end portion of the absorbent main body 20 is connected to the inner surface of the waist portion 12F in the width direction center portion of the abdominal side exterior sheet 12F, and the rear end of the absorbent body 20 is connected to the inner surface of the width direction center portion of the back side exterior sheet 12B. The ventral side exterior sheet 12F and the back side exterior sheet 12B are not continuous on the crotch side and are separated from each other. This separation distance Y can be about 150 to 250 mm.

  As can be seen from FIGS. 4 and 5, the upper opening of the waistline portion 12 becomes a waist opening WO through which the wearer's torso passes, and the lower edge of the waistline portion 12 and the absorbent body on both sides in the width direction of the absorbent body 20. The portions surrounded by the side edges 20 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 12 is the absorbent main body. It is a part which supports 20 with respect to a wearer.

(Exterior sheet)
As shown in FIG. 3, the abdominal exterior sheet 12F and the back exterior sheet 12B are formed by laminating two sheets S1 and S2 such as non-woven fabric, and between the sheets S1 and S2 in order to improve fit to the waistline. Further, elongated elastic elastic members 15-18, 19T, 19U such as rubber thread are provided at a predetermined extension rate. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >. 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. Further, as the elongated elastic elastic members 15 to 18, 19T, and 19U, synthetic rubber or natural rubber may be used.

  And in this embodiment, the balance of the contraction force in the width direction between the abdominal side and the back side of the exterior sheet 12 with respect to the joint portion is balanced, and the joint tilt angle in the joint tilt test is particularly preferably 20 degrees or less. Is 10 degrees or less, more preferably 5 degrees or less, the number, thickness, stretch rate, spacing, type of material, and arrangement of each elongated elastic stretch member are determined.

  More specifically, the back-side exterior sheet 12B includes a back-side main body portion 13 that occupies the same vertical range as the joint portion 12A, and a back-side extension portion 14 that extends below the back-side main body portion 13. Have. The back side extension part 14 has the width direction center part 14M which overlaps with the absorptive main body 20, and the collar part cover part 14C extended to the both sides.

  The shape of the dorsal extension 14 can be determined as appropriate, but in the illustrated example, the upper end of the dorsal extension 14 has the same width as the dorsal body 13 and extends below the dorsal body 13. The width is narrowed as the lower side approaches the crotch side. A portion having the same width as that of the back-side 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 back side extension part 14 can be determined suitably, the width direction length 14x of the collar part cover part 14C (width direction of the edge 14e of the width direction outer side of the collar part cover part 14C, and the side edge of the absorptive main body 20) Is more preferably 80 to 160 mm, and the length 14y (extension length) of the collar cover portion 14C in the vertical direction 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 back-side main body 13 can be conceptually divided into an upper part (upper end part, that is, a waist part in the illustrated example) W and a lower part U in the vertical direction, and the lower part U is further divided into a lower end part Z. And an intermediate portion M between the upper portion W and the lower end portion Z, the range of which varies depending on the size of the product. Generally, the upper portion W has a vertical length of 15 to 80 mm and a lower portion U. The vertical length can be 50-220 mm, the middle portion M can be 40-90% of the vertical length of the lower portion U, and the lower end portion Z can be the remaining portion. If the boundary is not fixed (the thickness, stretch rate, interval, type of material, and the vertical or width direction of the elongated elastic expansion / contraction member are not clearly defined), the lower end Z is the upper portion W. Shall have the same vertical length, upper side Minute W is in the range from the upper end of the 30mm.

In the upper part (waist part) W of the back-side main body part 13, a plurality of waist elastic elastic members 17 are spaced in the vertical direction so as to be continuous over the entire width direction, and at a predetermined extension rate in the width direction. It is fixed in a stretched state. Further, one or more of the waist elastic elastic members 17 disposed in the region adjacent to the intermediate portion M in the back main body 13 may overlap the absorber 20. The elastic waist member 17 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, 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 part U (intermediate part M and lower end part Z) of the back side main body part 13 except for the width direction central part that overlaps the absorbent main body 20, the width is provided at each part on the upper side and both sides in the width direction. The plurality of first elongated elastic elastic members 15 are fixed in a state where they are stretched along the width direction at a predetermined stretch rate at intervals in the vertical direction so as to be continuous over the entire direction. The vertical disposition range of the first elongated elastic elastic member 15 may be a part of the back main body 13, but is preferably substantially the whole (the range in which the elastic force acts on the whole).

The first elongated elastic elastic member 15 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. preferably used rubber thread ~1.0mm about ^2). The first elongated elastic elastic member 15 has an extension ratio of 150 to 300%, particularly about 240 to 300% at the intermediate portion M, and about 2 to 20 at intervals of 1 to 15 mm, particularly 3 to 8 mm. In the part Z, it is preferable that the stretch rate is 150 to 300%, particularly about 240 to 300%, and about 3 to 22 are provided at intervals of 1 to 15 mm, particularly 3 to 8 mm.

  Furthermore, in the back side extension part 14, except for the center part of the width direction which overlaps with the absorptive main body 20, it continues to each site | part of the width direction both sides over the whole width direction (at least over the whole collar cover part 14C). In addition, the plurality of second elongated elastic elastic members 16 are fixed in a state where they are extended in the width direction at a predetermined extension rate with a space in the vertical direction. 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 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. About ¹ to 15 mm, particularly 3 to 10 at intervals of 3 to 8 mm, and an elongation ratio of 240 to 400%, particularly 280 to 360%. It is preferable to fix each with a higher expansion ratio than the elastic elastic member. The second elongated elastic elastic member 16 is preferably set to have a higher stretch 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.

  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. On the other hand, since the force arc upward obliquely connecting the crotch side and both joints 12A is generated more strongly at a deeper angle θ, the collar cover 14C is unlikely to swell and bulge and has good fit. It becomes. Note that the comparison of the expansion ratios is a comparison based on the average of the expansion ratios of the elongated elastic expansion / contraction members arranged in plurality. Further, when configuring the abdominal exterior sheet 12F and / or the back exterior sheet 12B, by adjusting the tension of the nonwoven fabric S1, S2 in the width direction, the tension of S2 is greater than S1, The buttock cover portion 14C curls inward, and the fit of the buttock is further improved.

  Moreover, the thickness of the 1st and 2nd elongate elastic expansion-contraction members 15 and 16 is so that the back side extension part 14 may exhibit stronger contractive force than the intermediate part M and the lower end part Z of the back side main-body part 13. It is preferable to appropriately determine the stretch rate, the number, the interval, the kind of material, or the vertical arrangement.

  In addition, that the contraction force of the back side extension part 14 is stronger than the intermediate part M and the lower end part Z of the back side main body part 13 means that it is stronger than both, and is simply the average of the whole lower part U. It does not mean that it is stronger.

  The contraction force is the stress (contraction force per unit vertical width) applied to a certain width (vertical width) of the sheet when the sheet is pulled in the product width direction, and is measured as follows. It is. That is, first, a region to be measured is cut out from the exterior sheet 12 as a specimen, and one end of the specimen in the product width direction is sandwiched between one chuck C1 of the tensile tester and the other end is sandwiched with the other chuck C2. A tensile test is performed along the product width direction. The distance between chucks (the length during natural contraction) when the specimen is naturally contracted without being pulled is defined as A, and the distance between chucks (the maximum length when stretched) when the specimen is pulled until it is not contracted by the elastic elastic member. ) Is B, the stress applied between the chucks when the distance between the chucks is (A + B) / 2 is measured, and this is divided by the vertical width of the specimen to give the contraction force ( N / 10 mm). For example, the contraction force of the dorsal extension 14 is obtained by dividing the stress measured by the above method by the vertical width of the dorsal extension 14 using the dorsal extension 14 as a whole. However, even when the portion having the second elongated elastic elastic member 16 is a part of the dorsal extension portion 14, the contraction force of the dorsal extension portion 14 is obtained as described above.

  On the other hand, the abdominal exterior sheet 12F is composed of only the abdominal body part basically the same as the back body part 13 of the back exterior sheet 12B (the part occupying the same vertical range as the joint part 12A). It has a rectangular shape extending along the direction, and does not have the back side extension portion 14 like the back side exterior sheet 12B. Therefore, the same reference numerals are used for the upper end portion W and the lower portion U (intermediate portion M and lower end portion Z) in the vertical direction. It is preferable that the vertical lengths of the upper end portion W and the lower portion U (intermediate portion M and lower end portion Z) are equal to the back side exterior sheet 12B, but the balance of contraction force between the ventral side and the back side is adjusted. You can also make them different. In addition, also in the abdominal side exterior sheet 12F, a clear boundary between the middle part M and the lower end part Z constituting the lower part U is not determined (thickness of the elongated elastic elastic member, stretch rate, interval, material type, In the case where the upper and lower direction or width direction arrangement form is not clear), the lower end portion Z has the same vertical length as the upper portion W, and the upper portion W is in a range of 30 mm from the upper end.

  That is, the upper end portion (waist portion) W of the abdominal exterior sheet (abdominal body portion) 12F has a plurality of waist elastic elastic members 18 spaced in the vertical direction so as to be continuous over the entire width direction. And it is being fixed in the state extended | stretched along the width direction by the predetermined expansion | extension rate. The waist elastic stretchable member 18 in the ventral exterior sheet 12F is as close as possible in number, thickness, stretch rate, spacing, and vertical arrangement to the waist elastic stretchable member 17 in the back exterior sheet 12B. Although preferred, it can be varied to some extent to adjust the balance of contraction force between the ventral and dorsal sides. Specifically, the number difference is 5 or less, preferably 3 or less, the thickness difference is 450 dtex or less, preferably 300 dtex or less, the elongation difference is 50% or less, preferably 20% or less, the gap difference Is 5 mm or less, preferably 3 mm or less.

  Further, in the middle part M of the abdominal exterior sheet (abdominal body part) 12F, except for the central part in the width direction that overlaps the absorbent main body 20, it is continuous over the entire width direction on each of the upper side and both sides in the width direction. Thus, the plurality of third elongated elastic elastic members 19T are fixed in a state where they are extended in the width direction at a predetermined extension rate with a space in the vertical direction. Although the vertical disposition range of the third elongated elastic elastic member 19T may be a part of the intermediate portion M, it is preferable that the third elongated elastic elastic member 19T is substantially the whole (a range where the expansion / contraction force acts on the whole).

  As the third elongated elastic elastic member 19T, the number, thickness, expansion rate, interval, and vertical arrangement of the first elongated elastic elastic member 15 arranged in the middle portion M are made as close as possible. Although preferred, it can be varied to some extent to adjust the balance of contraction force between the ventral and dorsal sides. Specifically, the number difference is 5 or less, preferably 3 or less, the thickness difference is 450 dtex or less, preferably 300 dtex or less, the elongation difference is 50% or less, preferably 20% or less, the gap difference Is 5 mm or less, preferably 3 mm or less. In particular, the expansion ratio of the third elongated elastic elastic member 19T is preferably lower than that of the first elongated elastic elastic member 15 disposed in the intermediate portion M. Moreover, it is preferable that the contraction force of the middle part M of the abdominal body part is the same as or weaker than the contraction force of the middle part M and the lower end part Z of the back side body part 13. This contraction force can be adjusted by appropriately determining the thickness, expansion rate, number, interval, type of material, or vertical arrangement of the first and third elongated elastic members 15 and 19T.

  Further, in the lower end Z of the abdominal exterior sheet 12F (abdominal body part), except for the central part in the width direction that overlaps the absorbent main body 20, it is continuous over the entire width direction at each of the upper side and both sides in the width direction. As described above, the plurality of fourth elongated elastic elastic members 19U are fixed in a state of being spaced apart in the vertical direction and stretched along the width direction at a predetermined stretch rate. Although the vertical disposition range of the fourth elongated elastic elastic member 19U may be a part of the lower end portion Z, it is preferable that the fourth elongated elastic elastic member 19U be substantially the whole (a range where the expansion / contraction force acts on the whole).

  As the fourth elongated elastic elastic member 19U, the number is about 2 to 20, and it is preferable that the distance and the vertical arrangement are as close as possible to the second elongated elastic elastic member 16, but the ventral side and It can be made different to some extent to adjust the balance of contraction force between the dorsal sides. Specifically, the number difference is 10 or less, preferably 5 or less, and the interval difference is 10 mm or less, preferably 5 mm or less. Here, in the buttock cover portion 14C, the expansion rate of the fourth elongated elastic elastic member 19U located on the extension line in the direction (obliquely upward) from the crotch side to both joints is defined as the fourth elongated elastic elastic member 19U. If the stretch rate of the first elongated elastic elastic member 15 disposed on the back side is higher than that of the first elongate elastic member 15, a force for pulling up the buttock cover portion 14 </ b> C acts diagonally upward, so that the heel portion cover portion 14 </ b> C rises and swells. Is less likely to occur and is preferable. Furthermore, the magnitude relationship (high / low relationship) of the expansion ratio of the first to fourth elongated elastic elastic members 15, 16, 19T, 19U is as follows: fourth elongated elastic elastic member ≧ second elongated elastic elastic member> When the first elongated elastic elastic member is equal to or greater than the third elongated elastic elastic member, the force of pulling the collar cover portion 14C obliquely upward works more effectively, so that the fit property of the collar cover portion 14C is improved. The effect of the present invention, which is improved and hardly causes swelling and swelling, is further enhanced.

The fourth elongated elastic elastic member 19U has a thickness of about 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. 0.1 to 1.0 mm ² ), and the elongation is preferably 240 to 400%, particularly about 280 to 360%.

  In particular, the contraction force of the lower end portion Z of the abdominal body portion 12F is preferably stronger than the contraction force of the intermediate portion M and the lower end portion Z of the back side body portion 13, and is the same as the contraction force of the dorsal extension portion 14. More preferably, it is strong or strong. Furthermore, the contraction force of each part of the exterior sheet 12 is such that the lower end portion of the ventral body portion ≧ the back extension portion> the middle portion of the back body portion and the lower end portion ≧ the middle portion of the ventral body portion. Is preferred. The shrinkage force of each part of the exterior sheet 12 is the thickness, stretch rate, number, interval, type of material, or the first, second, third and fourth elongated elastic elastic members 15, 16, 19T, 19U. It can be adjusted by appropriately determining the vertical arrangement.

  In a pants-type disposable diaper in which the balance of contraction force between the ventral side and the dorsal side is appropriately adjusted, as shown in FIG. While being suppressed, the contraction force by each elongated elastic stretch member of the ventral exterior sheet 12F and the contraction force by each elongated elastic stretch member of the back exterior sheet 12B are balanced at the junction 12A as a boundary. The inclination angle θ1 is 20 degrees or less, that is, in use, a phenomenon (see FIG. 9) in which the joint portion 12A is shifted to the back side toward the lower end side is less likely to occur. As a result, it is possible to effectively prevent bulging and swelling of the buttock cover portion 14C.

  On the other hand, as shown in the drawing, the first, second, third, and fourth elongated elastic elastic members 15, 16, 19T, and 19U are disposed on both sides in the width direction except for the center portion in the width direction that overlaps the absorbent main body 20. In addition to the form in which the elastic elastic members are present only on both sides in the width direction, the elastic elastic members are present across the absorbent main body 20 from one side to the other side in the width direction. In addition, the elastic stretchable member is cut at the central portion in the width direction overlapping the absorbent main body 20, and a configuration in which the stretchable force does not act (substantially equivalent to not providing the elastic stretchable member) is also included. . In the present invention, the first, second, third, and fourth elongated elastic elastic members 15, 16, 19T, and 19U are made absorbent so that the elastic force acts on the entire width of the exterior sheet 12. It can also be provided across the main body 20 from one side in the width direction to the other side.

  Since the second elongate elastic elastic member 16 is not welded to the sheet by the side edge joining portion 12A like the first elongate elastic elastic member 15, the first elongate elastic elastic member 16 is not particularly limited as in the present application. In the case where the expansion ratio is higher than that of the elastic elastic member 15, it is desirable to take measures to prevent the second elongated elastic elastic member 16 from being pulled in. As described above, it is one of preferable means to provide an extended weld portion extending from the joint portion 12A. Moreover, you may improve the adhesive strength of the 2nd elongate elastic elastic member 16 and sheet | seat S1, S2 by another method. For example, the adhesive strength can be improved by directly applying an adhesive to the second elongated elastic elastic member 16, but when the amount of the adhesive used is increased, the texture of the expansion / contraction part may be lowered. It is desirable to use the following fixing method by welding. In the above-described 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 so that the elastic force does not act on the second elongated elongated member. 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. What is necessary is just to weld-fix 16 and nonwoven fabric S1, S2. These pull-in prevention measures may be combined with each other.

(Fastening method of elastic elastic member by welding)
FIG. 6 shows a state in which a tension is applied to the second elongated elastic stretch member 16 and the abdominal exterior sheet 12F and / or the back exterior in the vicinity of both ends in the width direction of the second elongated elastic stretch member 16. This shows a method in which the second elongated elastic member 16 is fixed by frictional force with the sheets S1 and S2 by welding the sheets S1 and S2 constituting the sheet 12B at a predetermined interval. 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 2nd elongate elastic elastic member 16 can be firmly fixed, without using an adhesive agent. In addition, since the second elongated elastic elastic member 16 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, since the influence of heat and pressure on the second elongated elastic member 16 and the peripheral portions of the sheets S1 and S2 is less than that of ultrasonic welding, it is more preferable to use ultrasonic welding. .

  FIG. 7 shows a state in which a tensile force is applied to the second elongated elastic elastic member 16 and both ends in the width direction of the second elongated elastic elastic member 16 and the sheets S1 and S2 are at a predetermined interval. Are attached to the sheets S1 and S2 by the frictional force with the sheets S1 and S2 and the adhesive force at the end of the second elongated elastic member 16 in the width direction. Shows how to be fixed. A symbol M in the figure indicates a welded portion, and a symbol N indicates a non-welded portion. By adopting such a structure, in addition to the frictional force with the sheets S 1 and S 2, the second elongated elastic elastic member 16 is made more adhesive by the adhesive force at the end in the width direction of the second elongated elastic elastic member 16. It is firmly fixed. In addition, since adhesion is only the end portion in the width direction of the second elongated elastic expansion / contraction member 16, there is no possibility of deterioration or cutting of the second elongated elastic expansion / contraction member 16.

  The second elongated elastic elastic member 16 is fixed by a frictional force with the sheets S1 and S2. The second elongated elastic elastic member 16 is applied with a tensile force applied to the second elongated elastic elastic member 16. The inner layer and the outer layer are intermittently welded in the vicinity of both end portions in the width direction of the elastic elastic member 16, and the second elongated elastic elastic member 16 is fixed to the sheets S1 and S2, thereby eliminating the load thereafter. (No tension), the cross-sectional outer diameter of the second elongated elastic stretch member 16 is increased, and the width direction of the second elongated elastic stretch member 16 is sandwiched from both sides by the welded portions with the sheets S1 and S2. A pressing force is applied to the. As a result, the second elongated elastic elastic member 16 is fixed only by the frictional force with the sheets S1 and S2, without fixing the second elongated elastic elastic member 16 with an adhesive.

(Absorbent body)
The absorptive main body 20 can take any shape, but is rectangular in the illustrated form. As shown in FIG. 2, 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. On the back side of the liquid-impermeable sheet 70, so as to cover the entire back surface of the absorbent main body 20, or so as to cover the entire portion exposed between the abdominal exterior sheet 12F and the back exterior sheet 12B, The crotch outer sheet 12M can also be fixed. As the crotch outer sheet 12M, the same material as the ventral outer sheet 12F and the back outer sheet 12B can be used, but a different material can also be used. 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 absorbent main body 20 can also be detachably attached to the exterior sheet 20 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 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.

(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 a doubled water-repellent non-woven sheet, and is formed so as to protrude from the back side of the absorbent body 56 to the lower side of the top sheet 30 and to protrude to the front side. Yes. In order to prevent urine moving in the lateral direction along the top sheet 30, a second liquid-impermeable sheet 72 is interposed between the double nonwoven fabric sheets forming the barrier cuff 60. Although not shown, the side part of the liquid-impermeable sheet 70 may be inserted between the double nonwoven fabric sheets, and may extend 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. 2, the base side of the barrier cuff 60 is positioned so that the middle thread rubber 62 is positioned on the center side of the front end rubber threads 62 and 62 and fixed to the front and rear end portions of the top sheet 30. It rises diagonally toward the center side, and the tip part stands up diagonally outward from the intermediate part.

(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 the cellulose ester 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. 2, 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 ones, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, 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 instead 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. 2, the covering sheet 58 wraps only the back and side surfaces of the continuous fiber 52, 52... And the superabsorbent polymer particles 54, 54. It may be covered. 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. 2, the holding sheet 80 may be provided only below the absorber 56, or may be wound up and extended to the upper surface of the absorber 56 through the side surface of the absorber 56, although not shown. 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 outer sheet 12F and the back outer 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, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a pointbonded nonwoven fabric, an air-through nonwoven fabric, an air point nonwoven fabric, a spunlace nonwoven fabric, an SMS nonwoven fabric, or the like, each made of fibers such as PP, PP / PE, PP / PET, or the like, or What added the deodorizer etc. to this can be used.

  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 {4: no kinking and fluffing ○: no kinking and fuzzing △: kinking and fuzzing x: non-woven fabric was broken} 4 Evaluate in stages.

  The crotch outer sheet 12M may be a sheet provided with design elements by printing or coloring. When used in combination with the above-described design sheet, it is preferable to dispose the designs so that they do not overlap.

  It is preferable to use a stretchable nonwoven fabric as the crotch outer sheet 12M, and to extend and paste in the longitudinal direction of the absorbent main body 20 because the fit of the crotch part is improved.

When the absorbent body 56 is an ultra-thin absorbent body having a fiber basis weight of 100 g / m ² or less and a high-absorbent polymer basis weight of 100 g / m ² or more, the absorbent body 56 is not stiff so as not to reduce the ease of breaking. It is necessary to strengthen the stiffness in the crotch region. On the other hand, firmness is not necessary in the abdomen and back. Therefore, in such a form, it is preferable to use a sheet having high rigidity (roughness) as the crotch outer sheet 12M. Specifically, a sheet having a bending resistance measured by the Clark method (JISL1096 C method) and a sum of the MD direction and the CD direction of the sheet of 100 mm or more, preferably 150 mm or more may be used.

  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 overlap the absorbent main body 20. 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.

(Other)
The abdominal exterior sheet 12F of the above embodiment is composed of only the portion occupying the same vertical range as the joint 12A, but the ventral main body occupying the same vertical range as the joint 12A and the ventral main body It can also be set as the structure which consists of an abdominal-side extension part extended below the part. Thereby, the leg periphery shape of the abdominal exterior sheet | seat 12F can be made into the shape fitted along a buttock. There is no need to dispose an elongated elastic expansion / contraction member in the ventral extension portion like the back extension portion, but in the case of disposition, the elongated elastic expansion / contraction member disposed in the middle portion M of the abdominal body portion. What is necessary is just to make it the same thickness as the member 19T, an expansion rate, a space | interval, and an up-down direction arrangement | positioning. In this case, the area of the ventral extension part is preferably 10 to 80% of the area of the dorsal extension part, and more preferably 20 to 50%. If the ventral extension is excessively large, the fit is rather impaired, which is not preferable.

  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 2-2 sectional drawing of FIG. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. It is a front view of a product state. It is a rear view of a product state. 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 a photograph which shows the mounting state of embodiment. It is a photograph which shows the mounting state of a comparative example. It is the schematic which shows the test procedure of a junction inclination test.

  DESCRIPTION OF SYMBOLS 10 ... Absorbent main body, 12 ... Exterior sheet, 12F ... Abdominal side exterior sheet, 12B ... Back side exterior sheet, 13 ... Back side body part, 14 ... Back side extension part, 15 ... 1st elongate elastic elastic member , 16 ... Second elongated elastic elastic member.

Claims (7)

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 girth part formed by joining the joint part;
The front end is connected to the inner surface in the width direction central portion of the ventral exterior sheet, the rear end is connected to the inner surface in the width direction central portion of the back exterior sheet, and passes from the back side to the ventral side through the crotch portion. With an absorbent main body covering
In the pants-type paper diaper where the ventral exterior sheet and the back exterior sheet are not continuous on the crotch side and are separated from each other,
The back-side exterior sheet has a back-side main body portion that occupies the same vertical range as the joint portion, and a back-side extension portion that extends below the back-side main body portion,
This back side extension part has the width direction center part which overlaps with the above-mentioned absorptive main part, and the buttock cover part extended to the both sides,
The abdominal exterior sheet consists of only the abdominal body part occupying the same vertical range as the joint part, or the abdominal body part occupying the same vertical range as the joint part, and the lower part of the abdominal body part A ventral extension extending to the side,
Among the upper and lower end portions in the vertical direction of the back side main body portion and the intermediate portion therebetween, the back side waist portion fixed to the upper end portion in a state of being stretched along the width direction at a predetermined stretch rate. A plurality of elastic elastic members are provided at intervals in the vertical direction, and are fixed to at least a portion of the intermediate portion and the lower end portion that does not overlap the absorbent main body in a state of being stretched along the width direction at a predetermined stretch rate. A plurality of first elongated elastic elastic members are provided at intervals in the vertical direction, and are fixed to at least the flange cover portion in a state of being stretched along the width direction at a predetermined stretch rate. A plurality of elongated elastic elastic members are provided at intervals in the vertical direction,
In the belly side exterior sheet, the upper end portion of the ventral side main body portion, the lower end portion, and the intermediate portion therebetween are extended to the upper end portion along the width direction at a predetermined extension rate. A plurality of fixed elastic waist members on the ventral side waist portion are provided at intervals in the vertical direction, and at least a portion that does not overlap the absorbent main body in the middle portion is stretched along the width direction at a predetermined stretch rate. A plurality of third elongated elastic elastic members fixed in a fixed state are provided at intervals in the vertical direction, and at least at a portion that does not overlap the absorbent main body at the lower end portion in the width direction at a predetermined extension rate. A plurality of fourth elongated elastic elastic members fixed in a stretched state are provided at intervals in the vertical direction;
The second elongated resilient and elastic elongation modulus of members rather higher than the expansion rate of the first elongated resilient and elastic members, and the extension ratio of the fourth elongated resilient and elastic members are first elongated resilient and elastic Higher than the elongation of the member,
Pants-type paper diaper characterized by that. The magnitude relationship between the stretch rates of the first to fourth elongated elastic elastic members is as follows:
Fourth elongated elastic elastic member ≧ second elongated elastic elastic member> first elongated elastic elastic member ≧ third elongated elastic elastic member,
The pants-type paper diaper according to claim 1, wherein: The back waist portion elongated elastic stretch member, the ventral waist portion elongated elastic stretch member, the first elongated elastic stretch member, so that the joint tilt angle in the joint tilt test is 20 degrees or less, Number, thickness, stretch rate, spacing, material type, and vertical direction of each of the second elongated elastic elastic member, the third elongated elastic elastic member, and the fourth elongated elastic elastic member The pants-type paper diaper according to claim 1 or 2 , wherein the arrangement is defined. The magnitude relationship of the shrinkage force in the width direction acting on each part of the exterior sheet is
Lower end portion of the ventral body portion ≧ the back side extension portion> intermediate portion and lower end portion of the back side body portion ≧ intermediate portion of the ventral body portion,
The pants-type paper diaper according to claim 3, wherein The pants according to any one of claims 1 to 4 , wherein at least an upper end portion of the back side extension portion has the same width as the back side main body portion and extends below the back side main body portion. Patterned diapers. The disposable diaper according to any one of claims 1 to 5 , wherein an edge on the outer side in the width direction of the buttock cover portion is linear or curved so as to approach the absorbent main body as it approaches the crotch side. . The length of the width direction of the said buttock cover part is 80-160 mm, and the length of the vertical direction of the said buttock cover part is 30-80 mm, The underpants type paper diaper of Claim 6 .

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