WO2010007872A1

WO2010007872A1 - Disposable diaper

Info

Publication number: WO2010007872A1
Application number: PCT/JP2009/061817
Authority: WO
Inventors: 英聡吉田
Original assignee: 大王製紙株式会社
Priority date: 2008-07-18
Filing date: 2009-06-29
Publication date: 2010-01-21
Also published as: JP4685135B2; JP2010022586A

Abstract

A disposable diaper having improved fitness to the roots of wearer’s thighs which roots extend from the crotch to the inner surfaces of the thighs. Elastic stretchable members (13) for thigh roots are mounted between those portions of a back sheet (1) and an exterior sheet (12) which are on both sides of a center line extending in the diaper’s lateral direction, and the elastic stretchable members (13) extend in the front-back direction from a belly side portion (F) through a crotch section up to a back portion (B) so that at least those portions of the elastic stretchable members (13) which are located in the crotch section extend through side sections on both sides of an absorbing body (3). Slits (3X) are formed in a portion or the entire portion of a portion of each of the side sections of the absorbing body (3) through which portion the elastic stretchable members (13) extend.

Description

Disposable diapers

The present invention relates to a disposable diaper provided with elastic elastic members for fastening around a leg extending along the front-rear direction on both sides of the center line in the width direction of the diaper.

In a disposable diaper, it is a well-known technique to dispose elastic elastic members along the edge of the leg opening in order to prevent leakage of excrement and the like from a portion around the leg.
However, various technical improvements have been made since leakage prevention is often insufficient only by providing elastic elastic members along the edges of the leg openings.
For example, in Patent Document 1 below, a first elastic stretchable member is provided along the edge of the leg opening, and the second elastic stretchable member is disposed at the center side in the width direction of the diaper. There is disclosed a technique for preventing leakage by providing a pocket portion for guiding excrement between these elastic expansion and contraction members so as to be displaced toward the center side in the width direction from the portion.
Further, in Patent Document 2 below, a first elastic expansion / contraction member is provided along the edge of the leg opening, and a second elastic expansion / contraction linearly along the diaper front-rear direction on the center side in the width direction of the product. By providing a member and further providing a groove in a straight line along the front-rear direction of the diaper at the center of the absorbent body in the width direction, the crotch portion is configured to bulge outwardly away from the skin to prevent leakage. Techniques are disclosed.
Japanese Patent Laid-Open No. 11-188059 Japanese Utility Model Publication No. 6-21622

However, just by devising the arrangement of the elastic stretchable members as in the prior art, it has not been possible to sufficiently fit the base of the leg from the crotch to the inner side of the thigh (upper part of the inner point muscle group). Therefore, for example, when changing from a supine position to a sitting position and from a sitting position to a supine position, the shape of the base of the leg changes due to the posture of the wearer and the movement of the muscles and joints of the leg. The shape of the diaper could not follow, and an unnecessary space was formed between the skin and the diaper.
Then, the main subject of this invention is providing the disposable diaper which was excellent in the static and dynamic fit with respect to the root of a leg from the crotch to the thigh inner side surface, and was excellent in the leak prevention effect of the circumference of a leg.

The present invention that has solved the above-described problems and the effects thereof are as follows.
<Invention of Claim 1>
A support part having a crotch part, and a ventral part and a dorsal part extending respectively to the front side and the rear side of the crotch part;
In the portion including the crotch portion of the support portion, an absorbent body arranged to extend with a predetermined width along the diaper width direction center line,
On both sides of the diaper width direction center line in the support portion, the portion extending in the front-rear direction from the abdominal portion through the crotch portion to the back side portion and at least the portion located in the crotch portion of the absorbent body An elongated leg base elastic elastic member is provided so as to pass through the part overlapping both sides,
A slit or a linear compression part is formed in part or all of the passage part of the leg base elastic elastic member on both sides of the absorbent body along the passage direction of the leg base elastic elastic member,
A plurality of the leg-base elastic stretch members are arranged in parallel on both sides of the diaper width direction center line, and at least one of the leg-base elastic stretch members on each side is the slit or line. Arranged so as to pass through the area of the compression section, and at least one other is arranged so as to pass through the portion overlapping the absorber on the outside in the width direction of the area of the slit or linear compression section,
A disposable diaper characterized by that.

(Function and effect)
The main feature of the present invention resides in that a leg-base elastic elastic member having a characteristic arrangement as described above is combined with a slit having a characteristic arrangement corresponding to the currency portion. That is, by the action of the contraction force of the leg-attached elastic member, the passage part of the leg-attached elastic member in the crotch part is pressed against the base of the leg in the crotch. At this time, when a slit or a linear compression part is formed in a part or all of the passage portion of the leg-base elastic elastic member on both sides of the absorbent body along the passage direction of the leg-base elastic elastic member. The absorbent body is securely bent along the slit or the linear compression part, and the corner part fits more appropriately to the base of the leg in the crotch, and the leg base elastic part of the part having the absorbent part in the crotch part A portion on the outer side in the width direction than the passage part of the elastic member fits more appropriately from the base of the leg to the periphery of the leg, and a portion on the inner side in the width direction fits more appropriately from the base of the leg to the crotch. In addition to the static fit, not only the dynamic fit, but also the diaper against the shape change around the base of the leg when changing from the supine position to the sitting position and from the sitting position to the supine position, for example. The shape of this becomes easy to follow. As a result, an unnecessary space is hardly formed between the diaper and the base of the leg, and leakage is less likely to occur.
Further, by providing a plurality of leg-attached elastic base members with the characteristic arrangement as described above, the base elastic base members that pass through the area of the slit or the linear compression part are attached to the bent portion of the absorber. Forms a solid corner and shows the action of pressing the corner firmly against the base of the leg, and the leg base elastic elastic member passing through the outside in the width direction of the slit or linear compression part region is from the bent part Also, the outer side in the width direction is firmly pressed from the base of the leg to the periphery of the leg.

<Invention of Claim 2>
The slit or the linear compression section is at least 160 to 160 mm from the front-rear direction position from the position of 10 mm on the rear side to the position of 15 mm on the front side with respect to the center line in the front-rear direction of the diaper, The disposable diaper of Claim 1 extended to the position of the front-back direction of 215 mm.

(Function and effect)
In a normal disposable diaper for adults, when the slit or the linear compression portion is formed over this range, the above-described effects of the present invention are further enhanced.

<Invention of Claim 3>
A portion overlapping each side of the absorber in each leg base elastic elastic member,
The diaper is located within a range from a position 10 mm on the rear side to a position 15 mm on the front side with respect to the center line in the diaper front-rear direction and a distance from the center line in the diaper width direction within a range of 40 to 30 mm. The rear bending point closest to the center line in the width direction and the front side of the diaper longitudinal center line within a range of 160 to 215 mm, and the distance from the diaper width direction center line is within a range of 80 to 95 mm The front bending point located in the order, and the rear bending point and the front bending point have a bent line shape that bulges to the center in the width direction,
Of the both sides of the absorbent body, along part or all of the part through which the portion between the rear bending point and the front bending point of each leg-base elastic elastic member passes, along the passing direction of the elongated elastic elastic member. The slit or linear compression part is formed,
The disposable diaper according to claim 1.

(Function and effect)
When the legged elastic base member has such a bent line shape, the part of the diaper that has the leg flexion point from the rear side to the front side is located in the thigh from the wearer's crotch. Since the shape is adapted to the base of the leg up to the side, the fit is further improved. In addition, the position of each said bending point assumes the disposable diaper for adults.

<Invention of Claim 4>
Each leg base elastic elastic member is

A first bending point located within the range of 110 to 90 mm on the rear side with respect to the diaper front-rear center line and having a separation distance from the diaper width direction center line of 100 to 110 mm;
The second position is within a range from a position of 10 mm rearward to a position of 15 mm frontward with respect to the center line in the diaper longitudinal direction and a distance from the center line in the diaper width direction within a range of 40 to 30 mm. Inflection point,
A third bending point located within a range of 130 to 165 mm in front of the diaper front-rear direction center line and having a distance from the diaper width direction center line of 65 to 55 mm;
A fourth bending point located within a range of 160 to 215 mm in front of the diaper longitudinal center line and a distance from the diaper width direction center line of 80 to 95 mm; and a diaper longitudinal center A bent line is formed in this order through a fifth bending point located in the range of 175 to 245 mm in front of the line and spaced from the central line in the diaper width direction by 90 to 120 mm. ,
The distance from the central line in the diaper width direction decreases from the portion behind the first bending point to the second bending point, and the second bending point is the closest to the central line in the diaper width direction at the second bending point. From the point to the front side of the fifth bending point has a slope that increases the separation distance from the central line in the diaper width direction,
The first bending point and the fourth bending point have a bent shape that bulges outward in the width direction, and the second bending point, the third and fifth bending points have a bent shape that bulges toward the center in the width direction. And
Among the both sides of the absorbent body, in a part or all of a portion through which a portion between the second bending point and the fourth bending point of each leg base elastic elastic member passes in the passing direction of the elongated elastic elastic member. Along the slits or linear compression parts are formed,
The disposable diaper according to claim 1.

(Function and effect)
By including such a bent line-shaped leg base elastic stretchable member having the first to fourth bending points, it extends from the crotch to the groin and the upper part of the thigh fascia latae muscles around the base of the wearer's leg. Not only the part but also the crotch and the convex part of the adductor muscle group are crossed to the buttocks, so that a more reliable fit is achieved. That is, the part of the diaper that has the second elastic point of the leg base elastic part from the second bending point to the first bending point is pressed from the rear part of the crotch of the wearer to the groin, and the rear part from the first bending point is attached. It is pressed from the person's groin to the upper part of the thigh fascia latae muscle. Further, the portion having the second bending point to the third bending point is pressed over the entire crotch of the wearer, and the portion from the third bending point to the fifth bending point has the portion having the fourth bending point as an apex. It is pressed along the convex part of the rotator muscle group, and the part in front of the fifth bending point is pressed against the wearer's buttocks. In this way, by providing the elastic stretchable member in an arrangement adapted to the complicated shape around the base of the leg, the above-described effects of the present invention are further enhanced. In addition, the position of each said bending point assumes the disposable diaper for adults.

<Invention of Claim 5>
On both sides of the support portion, there are provided leg surrounding portions that protrude outward in the width direction from the portion of the leg base elastic elastic member over at least the front-rear direction range corresponding to the edge of the leg opening. ,
The absorber is provided over at least the front-rear direction range corresponding to the edge of the leg opening, and at least the portion from the second bending point to the third bending point in the leg-base elastic elastic member of both sides thereof and the front-rear direction The corresponding part in the direction extends to the intermediate part in the width direction of the leg surrounding portion,
A leg elastic elastic member extending along the edge of the leg opening is attached to each leg surrounding portion in a state of being extended along the extending direction.
The disposable diaper according to claim 4.

(Function and effect)
When the leg-based elastic elastic member of the present invention is provided for a disposable diaper of a general design, the leg-based elastic elastic member is attached to both sides of the support part over the range in the front-rear direction corresponding to the edge of the leg opening. A leg-surrounding portion that protrudes outward in the width direction from the portion of the body, and at least a portion from the second bending point to the third bending point in the leg elastic base member on both sides of the absorbent body and the front and rear The corresponding part in the direction extends to the middle part in the width direction in the leg surrounding portion. Therefore, only the above-mentioned leg-attached elastic part of the leg portion cannot press the surrounding leg portion around the leg around the leg, and there is a possibility that excrement may leak out from the side of the absorber located in the surrounding part. In order to solve this, it is conceivable to narrow the width of the absorber in the portion including the crotch portion, but it is not preferable because it is difficult to secure the amount of absorption in the crotch portion, which is the most important portion. On the other hand, as in the invention described in this section, not only the leg elastic base member, but also the leg circumference elasticity extending along the edge of the leg opening in the leg circumference surrounding portion that protrudes outward in the width direction. Providing an expansion / contraction member is preferable because the leg surrounding portion is pressed around the leg and leakage from the leg hardly occurs.

<Invention of Claim 6>
A plurality of the leg elastic members are provided at predetermined intervals, and at least some of the leg elastic members are at least a third bent from the second bending point of the leg elastic member. The portion corresponding to the point and the portion corresponding in the front-rear direction are arranged so as to pass between the side edge of the absorber and the edge of the leg opening, and the remaining elastic members around the leg are at least the leg base elastic The disposable diaper according to claim 5, wherein a portion corresponding to the front-rear direction and a portion from the second bending point to the third bending point of the elastic member is disposed so as to pass through a position overlapping the side portion of the absorber. .

(Function and effect)
In this way, by providing a plurality of elastic elastic members around the legs, and by constructing a structure in which both the widthwise inner portion having the absorber and the widthwise outer portion not having the absorber are pressed around the leg, the entire surrounding portion of the leg is surrounded. Fits evenly around the legs, further preventing leakage.

As described above, according to the present invention, there are advantages such as a disposable diaper which is excellent in static and dynamic fit around the base of the leg and excellent in preventing leakage around the leg.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
(Basic structure)
1 to 9 show an example of a tape-type disposable diaper according to the present invention. This disposable diaper is absorbed between an inner surface of a liquid-impervious back sheet 1 and a liquid-permeable top sheet 2. The body 3 is interposed.
As the absorbent body 3, it is possible to use a laminate of pulp fibers, an aggregate of filaments such as cellulose acetate, or a nonwoven fabric, and a mixture obtained by mixing and fixing a superabsorbent polymer as necessary. . The absorber 3 has a single layer structure as well as a two-layer structure in which the upper layer absorber 3A having a smaller dimension than the lower layer absorber 3B is laminated on the surface side of the lower layer absorber 3B as shown in the figure. Can be adopted. Moreover, the absorber 3 can be wrapped with crepe paper (not shown) as needed. Moreover, the shape of the absorber 3 can be determined as appropriate, but in addition to the hourglass shape as illustrated, a shape that extends from the front side to the rear side of the crotch portion, such as a rectangle, is preferable. The absorbent fabric 3 preferably has a basis weight of about 100 to 500 g / m ² and a thickness of about 1 to 15 mm. Further, the basis weight of the highly water-absorbent resin is desirably about 0 to 300 g / m ² . If the content of the superabsorbent resin is too small, sufficient absorbability cannot be provided, and if it is too large, the entanglement between the pulp fibers is lost, and twisting or cracking is likely to occur.

The back sheet 1 extends outward from the periphery of the absorber 3 and blocks movement of excrement absorbed by the absorber 3 to the back side. As the back sheet 1, in addition to a plastic film such as a polyethylene film, a sheet having moisture permeability can be used without impairing water shielding from the viewpoint of preventing stuffiness. This water-impervious and moisture-permeable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. Can be used. The weight per unit area of the backsheet 1 is preferably 13 to 40 g / m ² , and the thickness is preferably 0.01 to 0.1 mm.

In order to make the outer surface of the diaper look and feel like a cloth, the entire back surface of the back sheet 1 is covered with an exterior sheet 12, and the outer peripheral edges of both

sheets

1 and 12 extend to the outer peripheral edge of the diaper. Although various nonwoven fabrics can be used as the exterior sheet 12, a spunbond nonwoven fabric is preferable. The exterior sheet 12 can be omitted.

As the top sheet 2, a perforated or non-porous nonwoven fabric or a perforated plastic sheet is used. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. Moreover, as a processing method of a nonwoven fabric, well-known methods, such as the spunlace method, the spunbond method, the SMS method, the thermal bond method, the melt blown method, the needle punch method, the air through method, the point bond method, can be used. The fiber basis weight of the nonwoven fabric used for the liquid-permeable top sheet 2 is preferably 15 to 30 g / m ² , and the thickness is preferably 0.05 to 1 mm.

The top sheet 2 extends outward from the periphery of the absorber 3, and a portion extending outward from the side edge of the absorber 3 is fixed to the back sheet 1 with a hot melt adhesive or the like. In addition, the dot pattern in a figure represents the adhering part.

As shown in FIGS. 3 and 4, the side barrier sheet is formed on both sides of the inner surface of the article (in the illustrated embodiment, the surface of the back sheet 1 extending from the side edge surface of the top sheet 2 to the side). 4 of the width direction outer side 4 is affixed over the whole front-back direction. As the side barrier sheet 4, various non-woven fabrics (preferably spunbond non-woven fabrics), plastic films similar to those used for the back sheet, or laminated sheets thereof can be used. In this respect, a nonwoven fabric subjected to a water repellent treatment is preferable. The portion 4c on the center side in the width direction of the side barrier sheet 4 is fixed to the inner surface of the article (the surface of the top sheet 2 in the illustrated embodiment) by means such as hot melt adhesive at both ends in the front-rear direction. The middle part is a non-fixed free part, and the elongated elastic elastic member 4G is stretched along the front-rear direction at the tip part (end part on the center side in the width direction in the unfolded state) of the free part. It is fixed with a hot melt adhesive or the like. In the illustrated example, a plurality of the elongated elastic elastic members 4G are provided with a predetermined interval, but one may be used. The elongated elastic elastic member 4G (same for other elongated elastic elastic members) includes natural rubber or synthetic rubber formed into a thread shape, string shape, belt shape, etc., specifically, styrene rubber, olefin rubber, urethane. Commonly used materials such as rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon and polyester can be used. As shown in FIG. 4, this free portion constitutes a side barrier that stands up with respect to the inner surface of the article (the surface of the top sheet 2 in the illustrated embodiment) as a result of the contraction force of the elongated elastic elastic member 4 </ b> G acting. The base end 4b of the standing portion is located at the boundary between the fixed portion 4x on the outer side in the width direction and the inner portion 4c in the side barrier sheet 4. In FIG. 1, the diagonally upward hatched portion indicates the fixing portion of the side barrier sheet 4, and the diagonally upward diagonal hatching portion indicates the fixed portion of the back barrier sheet 30 described later.

At both ends in the front-rear direction of the disposable diaper 100, the back sheet 1, the exterior sheet 12, the liquid-permeable top sheet 2, and the side barrier sheet 4 are extended from the front and rear ends of the absorbent body 3 to the front and rear sides, respectively. An end flap portion EF that does not exist is formed. On the other hand, on the left and right sides of the disposable diaper 100, the back sheet 1, the exterior sheet 12, the liquid-permeable top sheet 2 and the side barrier sheet 4 are respectively extended from the side edges of the absorbent body 3 to the side. The side flap part which 3 does not exist is formed. Of the side flap portions, the portions located in the waist side portion of the abdominal side portion F and the waist side portion of the back side portion B are extended laterally from the intermediate portion therebetween, and these portions are The waist side side flap portion SF that becomes the waist portion of the diaper is formed, the intermediate portion is the leg surrounding portion LH, and both side edges thereof are the leg opening edges Le.

Fastening tapes 5 that protrude from the side edges are attached to both waist side side flap portions SF of the back side portion B, and a front target tape 6 extends along the width direction on the waist portion surface of the abdominal side portion F. When the diaper 100 is applied to the body, the fastening tapes 5 on both sides are turned from each side of the waist to the abdominal outer surface and fastened to the front target tape 6 when attached to the body. The front target tape 6 can be omitted, and in that case, the fastening tape 5 is fastened directly to the outer surface of the diaper (in the illustrated embodiment, the exterior sheet 12).

The fastening tape 5 includes a fixing portion 5f fixed between sheets in the waist side flap portion SF of the back side portion B by means such as a hot melt adhesive, and a width direction from between the sheets on the side edge of the side flap portion SF. The protruding portion 5e has an outer protruding portion 5e, and the protruding portion 5e has a distal end portion 5p and a main body portion 5b closer to the proximal end than the distal end portion 5p. On the inner surface side (liquid permeable surface sheet 2 side) of the front end portion 5p of the fastening tape 5, as a connecting portion for connection with the target tape 6, a hook tape having a number of hook-shaped protrusions on the surface (mechanical fastener ( (Surface fastener) male material) 9, 9 is attached, and the front target tape 6 has a surface on which a hook-like projection is removably hooked (mechanical fastener (surface fastener) female material) 6 is attached. It has been. The material of the outer surface of the diaper itself is used in place of the front target tape 6, or an adhesive layer is used in place of the hook tape 9, and a resin tape having a smooth adhesive surface is used as the front target tape 6. be able to.

In particular, the fastening tape 5 of the illustrated form is fixed over the entire width direction (that is, over the fixing portion 5f, the main body portion 5b, and the tip portion 5p) and the entire width direction of the tip portion 5p of the basic sheet 51. In addition to the reinforcing sheet 52, a portion corresponding to the fixing portion 5 f of the basic sheet 51 is reinforced by folding back and bonding the sheets. The hook tape 9 that is a connecting portion is attached to the intermediate portion in the width direction of the reinforcing sheet 52. By reinforcing the fixing portion 5f and the tip portion 5p in this way, it is possible to ensure the strength and rigidity of the fixing portion 5f and the tip portion 5p, and to ensure flexibility and stretchability in the main body portion 5b. Further, on the inner surface side of the basic sheet 51, a presser sheet 53 is laminated from between the reinforcing sheet 52 and the basic sheet 51 at the front end portion 5p to between the opposed surfaces of the folded portion of the fixed portion 5f. Between the basic sheet 51, the elastic elastic member 20 is bonded and fixed with a hot melt adhesive or the like. As the elastic elastic member 20, a sheet-like member can be used in addition to the above-described elongated member.

Each of the sheets 51 to 53 can be formed by bonding a plurality of materials in addition to a single material. The material of each of the sheets 51 to 53 is not particularly limited, but a nonwoven fabric is preferable. Any known nonwoven fabric can be used without any particular limitation. As fibers constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. Moreover, as a manufacturing method of a nonwoven fabric, well-known methods, such as the spunlace method, the spunbond method, the SMS method, the thermal bond method, the melt blown method, the needle punch method, the air through method, the point bond method, can be used. In particular, a spunbond nonwoven fabric and an SMS nonwoven fabric using olefin fibers are preferable. The basis weight of the nonwoven fabric to be used can be determined as appropriate, but the total basis weight of the nonwoven fabric in the main body portion 5b is 20 to 75 g / m ² , particularly 26 to 46 g / m ² , and the nonwoven fabric in the fixing portion 5f and the tip portion 5p. The total basis weight is preferably 35 to 130 g / m ² , particularly 46 to 116 g / m ² . Each basis weight of the nonwoven fabric used for the basic sheet 51 and the presser sheet 53 is preferably about 15 to 25 g / m ² , and each basis weight of the nonwoven fabric used for the reinforcing sheet 52 is about 50 to 80 g / m ^2. Is preferred. Within this range, ensuring the strength and rigidity of the fixing portion 5f and the tip portion 5p of the fastening tape 5 and ensuring the flexibility and stretchability of the main body portion 5b can be achieved in a balanced and effective manner. it can.

The arrangement of the elongated elastic elastic member 20 is not particularly limited as long as the elastic force in the width direction can be applied to the fastening tape 5, but in the example shown in FIG. It traverses and continues to the tip 5p. It is also possible to extend from the fixing portion 5f to the main body portion 5b. More specifically, the elastic elastic member 20 passes through the main body portion 5b from a position separated from the end of the fixing portion 5f opposite to the main body portion 5b side by a predetermined distance from the end portion 5p. It extends to a position closer to the main body 5b than the tape 9. Therefore, the elastic expansion / contraction member 20 does not extend from the end portion of the fixing portion 5f opposite to the main body portion 5b side and from the hook tape 9 to the tip end side portion. Of the elastic elastic member 20, the portion 21 located in the fixing portion 5f is bonded and fixed in its entirety in an unstretched state, and substantially the entire portion excluding both ends of the portion 22 located in the main body portion 5b extends in the width direction. In this state, the adhesive is fixed. Further, the portion 23 of the elastic expansion / contraction member 20 located at the tip 5p is also bonded and fixed in its entirety in a non-expanded state.

By adopting such a structure, since the fixing portion 5f does not contract, adhesion to the sheet (the gather sheet 4 and the back sheet 1) sandwiching the fixing portion 5f is ensured, the adhesive strength is not reduced, and elastic expansion and contraction is achieved. Transmission of force between the member 20 and the fixed portion 5f becomes direct, and the shape followability of the diaper due to the expansion / contraction action of the elastic expansion / contraction member 20 is not impaired. Further, the elastically expanding / contracting portion can be provided up to the vicinity of the fixed portion 5f, and the expansion / contraction length can be easily secured. Furthermore, by not having the elastic elastic member 20 at the end of the fixing portion 5f opposite to the main body portion 5b, the end becomes flat and adheres well to the sheet sandwiching the fixing portion 5f. Excellent adhesion strength. Similarly to the fixing portion 5f, the portion 23 of the elastic expansion / contraction member 20 located at the distal end portion 5f is also bonded and fixed in a non-expanded state, and the distal end portion 5p does not contract, so that the reinforcing sheet 52 and the basic sheet 51 are It adheres well and the adhesive strength of the reinforcing sheet 52 does not decrease. Moreover, since the front-end | tip part of the elastic expansion-contraction member 20 overlaps with the reinforcement sheet | seat 52, the transmission of the force between the hook tape 9 and the elastic expansion-contraction member 20 becomes smooth, and the shape followability of the diaper by the expansion-contraction action of the elastic expansion-contraction member 20 is also good. It becomes hard to be damaged.

When the elongated elastic elastic member 20 is used, it is preferable that a plurality of the elastic elastic members 20 are arranged in parallel in the vertical direction of the fastening tape 5 with a predetermined interval. Specifically, the number of elastic elastic members 20 is suitably about 8 to 100, particularly about 25 to 50, and the interval is preferably about 2 to 25 mm, particularly about 3 to 7 mm. . Further, the thickness of the elongated elastic elastic member 20 is preferably about 300 to 3000 dtex, particularly about 400 to 1300 dtex, more preferably about 900 to 1300 dtex, and the expansion rate at the time of attachment is about 150 to 500%, In particular, it is preferably about 200 to 400%, more preferably about 300 to 400%. As shown in FIG. 7 and FIG. 8, an elongated elastic expansion / contraction so as to form a wave shape extending in the vertical direction of the fastening tape 5 while reciprocating between the fixing portion 5 f and the tip portion 5 p across the main body portion 5 b. The member 20 can also be arranged. As a specific wave arrangement, a triangular wave arrangement as shown in FIG. 7 can be adopted, and a wave arrangement including a straight portion 20s and a folded portion 20r along the width direction can be adopted as shown in FIG. it can. In the latter case, the linear portion is preferably provided so as to extend over the fixed portion 5f and the tip portion 5p, and the folded portion 20r preferably has a curved shape such as an arc shape.

11 and 12 schematically show an example of the attachment line of the elastic elastic member 20 when the fastening tape 5 shown in FIGS. 1, 3 and 6 is manufactured. The expansion process part 101, the 1st adhesion process part 102, the shrinkage | contraction process part 103, and the 2nd adhesion process part 104 are provided in this order. In the section from the elastic stretching member 101 to the second bonding step 104, it rotates around the vertical axis arranged at predetermined intervals in the MD direction (line flow direction) on both sides of the CD direction (line crossing direction). A pulley 110 group that rotates, and an endless transport belt 111 that is wound around the pulley 110 group are provided. The distance between the belts 111 increases toward the downstream side in the extension step unit 101, and a predetermined width is maintained on the downstream side. Each conveyor belt 111 is driven so that the outer side in the CD direction faces the downstream side of the line. At the upstream end of the conveyor belt 111, a rubber thread roll 120 wound with a winding diameter that is somewhat larger than between the belts 111 is provided so as to have a center along the MD direction. From these rubber thread rolls 120, the rubber thread 20 as an elongated elastic elastic member is sent out in a spiral shape and is wound around the conveyor belts 111 in a spiral shape. At this time, the rubber thread 20 is hooked on an unevenness (not shown) provided on the surface of the conveyor belt 111 and is moved downstream while maintaining a constant spiral pitch as the conveyor belt 111 moves. Along with this movement, in the stretching step unit 101, the spiral rubber thread 20 is stretched in the CD direction (width direction in the diaper) by increasing the distance between the two conveying belts 111.

On the other hand, an adhesive 130 is applied in advance to a portion where the thread rubber 20 is fixed in the stretched state, and a band-shaped basic sheet in which the adhesive 130 is not applied to both ends in the CD direction where the thread rubber 20 is fixed in the non-stretched state. 51 is supplied from above the line, and is attached to the rubber thread 20 flowing downstream while maintaining the helical extension state. At this time, only the middle portion in the CD direction of the thread rubber 20 is brought into contact with the application portion of the adhesive 130, so that it is bonded and fixed to the basic sheet 51. Not. Further, the rubber thread 20 is arranged at a predetermined interval in the MD direction at the adhesive fixing portion. The application pattern of the adhesive 130 can be determined as appropriate. However, if linear application portions along the MD direction are provided at intervals in the CD direction, there is an advantage that a beautiful vertical gutter is formed as described later. This is preferable because it is provided.

In the next shrinking process section 103, the rubber thread 20 having the CD-direction intermediate part bonded and fixed to the basic sheet 51 is cut while the non-bonded parts at both ends in the CD direction abut against the cutter 140 in the moving process. Is released from. As a result, the thread rubber 20 spirally wound around the two conveyor belts 111 is divided into a plurality of thread rubbers 20 arranged at intervals in the MD direction, and both ends of each divided portion. The non-adhesive portion 20n of the portion contracts to the non-stretched state. Thereafter, the second bonding step is immediately performed. That is, in the second bonding process section 104, a belt-like presser sheet 53 in which the adhesive 131 is applied to the portion where the thread rubber 20 is fixed in the stretched state and the portion where the thread rubber 20 is fixed in the non-stretched state is supplied from below the line. Affixed to the adhesive fixing surface of the rubber thread 20 at 51. As a result, the rubber thread 20 is sandwiched between the basic sheet 51 and the presser sheet 53 including the non-stretched portion 20n, and is adhered and fixed to both the

sheets

51 and 52.

The laminated body 150 manufactured in this manner is folded and fixed to the basic sheet 51 on the side to be the fixing portion 5f, and the reinforcing sheet 52 and the hook tape 9 are attached to the front end portion 5p in this order with an adhesive, and then the sewing machine 150 It is attached to a diaper manufactured separately through eye formation and cutting into a predetermined shape.

When the elongated elastic stretchable member 20 is arranged as shown in the drawing, the elongated elastic stretchable member 20 straddles at least the fixing portion 5f and the main body portion 5b, and straddles the main body portion 5b and the distal end portion 5p. In addition, since it extends along the direction crossing the vertical direction, the elongated elastic elastic member 20 is not only a reinforcing member that connects the boundaries between the fixed portion 5f and the tip portion 5p and the main body portion 5b, but also at each boundary. Since the applied force is dispersed, tearing and tearing are prevented. Moreover, if only the elongated elastic stretchable member 20 is provided, the flexibility is not impaired, and the air permeability is not impaired because the shape is elongated.

The dimensions and the like of the elongated elastic elastic member 20 may be determined as appropriate. For example, with respect to the dimensions of the fastening tape 5, the height (vertical length) h is 60 to 240 mm, and the width of the fixing portion 5f is 20 to 20 mm. When the width of the main body 5b is 40 to 250 mm and the width of the tip 5p is 30 to 105 mm, the thickness of the elastic elastic member 20 is 300 to 2,500 dtex, and the vertical interval s is 2 to 30 mm. It is preferable to provide the elastic elastic member 20 over the entire vertical direction of the fastening tape.

In addition, when the elongated elastic elastic member 20 is sandwiched between the basic sheet 51 and the presser sheet 53 and these are integrally fixed with a hot melt adhesive, the application pattern of the adhesive can be appropriately determined, and the width direction Although only both end portions (for example, only the tip portion 5p and the fixing portion 5f) may be used, it is preferable that they are intermittent in the width direction, and in particular, the width direction portions of the bonded portion 54 and the non-bonded portion 55 are arranged in the vertical direction. Is preferred. In the figure, this adhesive portion is indicated by a dot pattern (shaded). Specifically, in the case of the illustrated form, the basic sheet 51 and the presser sheet 53 are bonded by a vertically striped bonding portion 54 that is formed at a predetermined interval in the width direction and that continues from the upper end to the lower end of the fastening tape. In addition, the elastic stretchable member 20 is bonded and fixed to both the basic sheet 51 and the presser sheet 53 by the vertically striped bonded portions 54, and the basic sheet 51 and the presser sheet 53 are bonded and fixed between the bonded portions 54. Absent. In addition, the width 54w of each bonded portion 54 is 5 mm or less, and the interval (width of the non-bonded portion 55) 55w between the bonded portions 54 is larger than the width 54w of the bonded portion 54.

More specifically, the width 54w of the bonded portion 54 is about 0.05 to 10 mm, particularly about 0.1 to 5 mm, and the width 55w of the non-bonded portion 55 is about 2 to 15 mm, particularly about 2 to 10 mm. It is preferable that the stretch ratio when the elastic elastic member 20 is fixed is about 150 to 500%, particularly about 200 to 400%. Further, the width of the portion of the fastening tape 5 where the elastic elastic member 20 is fixed in the stretched state (in the illustrated embodiment, the portion 22 of the main body portion 5b) is preferably 50 to 300 mm, particularly preferably 100 to 200 mm.

Thus, by adopting a vertically striped pattern composed of sufficiently thin and sufficiently spaced adhesive lines as the adhesive application pattern, as shown in FIGS. 13 and 14, the main body 5b of the fastening tape 5 is provided. Then, since the low-rigidity non-adhesive portions 55 that are continuous in the vertical direction are intermittently formed in the width direction, the non-adhesive portions 55 can be flexibly bent and the adhesive portions 54 that are continuous in the vertical direction can be bent. Since the width is thin, hardening by an adhesive is suppressed. As a result, the fastening tape 5 employing such an adhesive pattern can be flexibly fitted to the protruding portion of the body surface around the waist. Moreover, if the adhesive pattern is vertical stripes, the elastic elastic member 20 and the basic sheet 51 and the presser sheet 53 are bonded and fixed at a number of locations in the width direction, so that the fixing strength is excellent, and even if the expansion and contraction length is secured long, A regular and beautiful vertical fold is formed, so that the touch and appearance are improved and the expansion and contraction is also smooth.

As the elastic stretchable member 20 in the fastening tape 5, it is preferable to arrange a plurality of elongated elastic stretchable members in parallel in the vertical direction with a predetermined interval as described above from the viewpoint of air permeability and flexibility. However, since the elongated elastic elastic member 20 has a small contact area, the tightening tends to be locally tight. Therefore, in order to solve this, it is preferable to make the thickness 54t of the adhesive layer in the bonding portion 54 larger than the thickness of the elastic elastic member 20. As a result, even when the elongated elastic elastic member 20 is used, the tightening force is more widely dispersed by the multiple adhesive portions 54 extending in the direction intersecting the tightening direction, and local tightening is alleviated. It becomes like this. Specifically, when the thickness of the elastic elastic member 20 is about 900 to 1300 dtex (0.3 to 10 mm), the applied thickness 54t of the adhesive is 0.01 to 10 mm, particularly 0.1 to 1 mm. preferable.

The total amount of adhesive used for fixing the elongated elastic elastic member 20 and fixing between other nonwoven fabrics is preferably 5 to 40 g / m ² in the

main body portion

5b and 10 to 10 in the tip portion 5p. 60 g / m ² is preferable, and 5 to 60 g / m ² is preferable in the fixing portion 5f. Moreover, when employ | adopting such an adhesion | attachment form, it is preferable that it is a continuous adhesion | attachment in the fixing | fixed part 5f and the front-end | tip part 5p, and intermittent adhesion in the main-body part 5b.

Further, the fastening tape 5 of the illustrated embodiment is provided with perforations 10 extending in the width direction from the outer edge in the width direction to the inside of the main body portion 5b in the intermediate portion in the vertical direction, and each is fixed by separating the perforation 10. It can be separated into an upper stage part and a lower stage part provided with a part, a main body part, a tip part and a connecting part. The separation line by the perforation 10 is arranged so as not to cross the elongated elastic elastic member 20 and sufficiently separated, or in the case of crossing, the elongated elastic elastic member 20 is cut at the same time when the cut portion of the perforation 10 is formed. It is desirable to keep it. Instead of the perforation 10, it may be separated by cutting or the like in advance. Such a fastening tape 5 can be detachably connected to the front target tape 6 on the abdominal side portion in a state where the upper step portion and the lower step portion are crossed, and at this time, from the tip portion side portion b1 However, if the tensile stress at the time of elastic deformation is weaker in the portion b2 on the fixed portion side, the directions of the root portions of the upper step portion and the lower step portion are easily changed, and the adjustment of the crossing angle between the upper step portion and the lower step portion is facilitated. Of course, the present invention is not limited to such an upper and lower two-stage divided type, and can be applied to other known fastening tapes such as a type that is not divided into two stages.

On the other hand, in the illustrated disposable diaper, the rear end of the top sheet 2 (the end flap portion EF in the illustrated example) has a back barrier that stands on the inner surface of the diaper (the surface of the top sheet 2 in the illustrated example). A sheet 30 is provided. More specifically, as shown in FIG. 5, the back side barrier sheet 30 has a waist side end portion bonded to the surface of the top sheet 2 over the entire width direction by a bonding means such as a hot melt adhesive, and the crotch side. Both ends of the portion are sandwiched between the top sheet 2 and both barrier sheets 4 and joined to both sheets by a joining means such as a hot-melt adhesive (in FIG. 1, these joining portions are directed diagonally downward to the right) The portion between these two end portions is a non-fixed free portion, and the front end portion of this free portion is folded inward (to the top sheet 2 side) so that the opposing surfaces of the folded portions face each other. Is fixed by a solid means such as a hot melt adhesive, and the elongated elastic elastic member 31 is stretched along the width direction between the sheets of the folded portion by a solid means such as a hot melt adhesive. It is constant. In the illustrated example, a plurality of the elongated elastic expansion / contraction members 31 are provided with a predetermined interval, but one may be used. This free portion constitutes a back barrier that stands up against the inner surface of the diaper (the surface of the top sheet 2 in the illustrated embodiment) as a result of the contraction force of the elongated elastic elastic member 31 acting. The base end of the standing portion is located at the boundary between the fixed portion of the waist side end portion of the back side barrier sheet 30 and the inner free portion.

Furthermore, the waist side part (end flap part EF which is a waist side edge part in the example of illustration) in the back side part B is comprised as the back side expansion-contraction part 40 in which the width direction intermediate part elastically expands-contracts in the width direction. . Although the back side expansion / contraction part 40 of the example of illustration is provided only in the center part of the width direction, it can be provided over the whole width direction, and can be provided only in the width direction both sides, and it is line symmetrical with respect to the width direction center line WC. Is preferably provided. More specifically, the waist side end portion of the back side barrier sheet 30 is folded inward (top sheet 2 side), the opposing surfaces of the folded portions are fixed by a solid means such as hot melt adhesive, and the folded back. The elongated elastic elastic member 41 is fixed between the sheets of the portion by a solid means such as a hot-melt adhesive in a state of being stretched along the width direction. The number of the elongated elastic elastic members 41 may be one, but it is preferable to provide a plurality of elongated elastic members 41 at predetermined intervals as shown in the illustrated example. The number of elastic elastic members 41 is about 1 to 10, particularly about 2 to 5, and is 3 in the illustrated example. Further, the interval is preferably about 2 to 15 mm, particularly about 3 to 7 mm. Further, the thickness of the elongated elastic elastic member 41 is preferably about 500 to 1500 dtex, especially about 900 to 1300 dtex (about 0.1 to 3 mm, especially about 0.5 to 3 mm in the case of natural rubber), and is attached. The elongation at time is preferably about 140 to 200%, particularly about 140 to 180%. In the illustrated example, the elastic elastic member 41 of the back side elastic part 40 is attached using the waist side end part of the back side barrier sheet 30, but this elastic elastic member 41 is attached between the top sheet 2 and the back sheet 1. Alternatively, it can be fixed by being sandwiched between the back sheet 1 and the exterior sheet 12. By having such a back side elastic part 40, the waist side edge part in the diaper back side back part B is pressed elastically against a wearer's back, and a crevice is formed between a diaper and a wearer's back. It becomes difficult to occur.

The tensile stress at the time of elastic deformation in the width direction of the back side stretchable portion 40 is configured to be weaker (for example, 5% or more weaker) than the tensile stress at the time of elastic deformation of the main body portion 5b of the fastening tape 5. Is preferred. More specifically, it is preferable that the tensile stress at the time of elastic deformation in the back side stretchable portion 40 is 10 kg / m or less, and the tensile stress at the time of elastic deformation in the main body portion 5b of the fastening tape 5 is 5 to 25 kg / m. Is preferred. Such a difference in tensile stress at the time of elastic deformation can be set by appropriately selecting the thickness and number of elastic

elastic members

20 and 41 attached to each part. As a result, even when the back-side stretchable part 40 is pressed by the body and becomes insufficiently stretched when worn, the fastening tape 5 is stretched tightly including the stretch of the back-side stretchable part 40. Thus, when the back side portion 40 is released after being worn, the back side stretchable portion 40 is stretched by the strong contraction force of the fastening tape 5, and the back side stretchable portion 40 is elastically fitted to the wearer's back. It becomes like this. That is, since the back-side stretchable part 40 can be worn in a stretched state so as to obtain sufficient fit, a gap is hardly generated between the back-side portion B of the diaper and the wearer's skin. The tensile stress at the time of elastic deformation refers to a width direction tensile test by cutting a target portion in the width direction (in the case of the back-side stretchable portion 40, a portion where the elastic stretchable member 41 is fixed) from other portions. It means the tensile stress when contracted by 15% with respect to the extension length at the maximum extension in the width direction.

Moreover, when extending the back side expansion-contraction part 40 with the shrinkage | contraction force of the fastening tape 5 as mentioned above, the maximum expansion-contraction length of the width direction in the expansion / contraction part of the fastening tape 5 is set to the width direction in the back side expansion / contraction part 40. It is preferable that the length is 2 to 15 times, especially 5 to 7 times the maximum stretchable length, and the stretchable length of the fastening tape 5 is secured sufficiently longer than the back side stretchable portion 40. Note that the maximum stretchable length can be set by appropriately selecting the stretch rate of the elastic

stretchable members

20 and 41 attached to each part.

On the other hand, on both sides of the widthwise center line WC of the disposable diaper, a plurality of leg-base elastic elastic members 13 and a plurality of legs extending in the front-rear direction over at least the front-rear range A1 corresponding to the edge Le of the leg opening. The elastic elastic members 14 are attached so as to be symmetrical with respect to the center line WC in the diaper width direction in a state of being stretched along the extending direction. These elastic

elastic members

13 and 14 are fixed between the exterior sheet 12 and the back sheet 1 using a hot melt adhesive in the illustrated embodiment, but any other supporting part that supports the absorber 3 may be used. It can also be provided in the part. Here, the support part is a part that supports the absorbent body 3 so as not to be detached from the diaper, and is formed by a composite material other than the absorbent body 3. Specifically, in the case of the present embodiment, the back sheet 1 and the exterior sheet 12 that are members positioned on the back surface side of the absorber 3, the top sheet 2 that covers the surface side of the absorber 3, and the surface side of the absorber 3 The side barrier sheet 4 that covers both sides constitutes the support part of the absorbent body 3, and the middle part in the front-rear direction among the side edges in the width direction forms the edge Le of the leg opening through which the wearer's leg passes. ing. Therefore, the leg elastic base member 13 and the leg elastic member 14 are arranged between the back sheet 1 and the side barrier sheet 4, between the back sheet 1 and the top sheet 2, or depending on the mounting position. It can also be provided on the back surface of the top sheet 2. Moreover, at least one or a part of at least one of the leg-attached root elastic elastic member 13 and the leg-around elastic elastic member 14 can be attached between different sheets. These leg-attached elastic elastic members 13 and leg elastic elastic members 14 are elongated elastic elastic members extending in the front-rear direction, and an inner sheet and an outer sheet sandwiching and fixing them are a back sheet 1 and an outer sheet in the illustrated embodiment. 12.

Each leg base elastic elastic member 13 is for adapting a flat diaper member to a complicated shape around the leg root of the wearer, and from the crotch part to the back side B, the center line in the diaper front-rear direction A first bending point c1 located within the range of 110 to 90 mm rearward with respect to the LC and having a distance of 100 to 110 mm from the diaper width direction center line WC, and a diaper longitudinal center line A second bending point c2 that is in a range from a position of 10 mm on the rear side to a position of 15 mm on the front side with respect to the LC and that is separated from the center line WC in the diaper width direction by 40 to 30 mm. , In this order, and has a slope in which the distance from the central line WC in the diaper width direction decreases from the portion behind the first bending point c1 to the second bending point c2. 2 At the bending point c2 The first bending point c1 has a bent shape that bulges outward in the width direction, and the second bending point c2 has a bent shape that bulges toward the center in the width direction. It is what.

Further, each leg-attached elastic elastic member 13 is within a range of 130 to 165 mm forward from the diaper front-rear direction center line LC from the crotch part to the abdomen, and from the diaper width direction center line WC. The third bending point c3 located within the range of 65 to 55 mm in the separation distance, within the range of 160 to 215 mm on the front side with respect to the diaper front-rear direction center line LC, and the separation distance from the diaper width direction center line WC Is located within the range of 175 to 245 mm in front of the fourth bending point c4 within the range of 80 to 95 mm and the diaper front-rear direction center line LC, and is spaced from the diaper width direction center line WC. A diaper width direction center line WC extends from the second bending point c2 to the front side of the fifth bending point c5 through a fifth bending point c5 located in the range of 90 to 120 mm in this order. The fourth bending point c4 has a bending shape that bulges outward in the width direction, and the third and fifth bending points c5 bulge toward the center in the width direction. It has a bent shape. The leg base elastic member 13 may adopt another arrangement pattern from the crotch portion to the ventral side.

The number of the leg base elastic members 13 on the left and right sides can be determined as appropriate, but about 1 to 5, particularly about 2 to 4, is appropriate, and is 3 in the illustrated example. In the case where the number of the leg-base elastic members 13 on the left and right sides is plural, the interval is, for example, about 1 to 20 mm, preferably about 2 to 15 mm, and particularly preferably about 8 to 12 mm. Moreover, as each leg base elastic member 13, the styrene rubber, the olefin rubber, the urethane rubber, the ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, Commonly used materials such as silicon and polyester can be used, and the thickness is about 300 to 3000 dtex, especially about 500 to 1500 dtex, and in the case of natural rubber, about 0.1 to 3 mm, especially about 0.5 to 3 mm. preferable. Further, it is preferable that the elongation ratio at the time of fixing each leg base elastic elastic member 13 is about 600 to 1400%, particularly about 150 to 250%.

As shown in FIG. 9, when such a bent line-shaped leg base elastic stretchable member 13 is provided, the diaper has a complicated three-dimensional shape around the root of the leg, that is, the wearer's It fits securely not only from the crotch to the groin and the upper part of the thigh fasciae laevis muscle, but also from the crotch to the buttocks across the convex part of the adductor muscle group. More specifically, the part of the diaper having the second bent point c2 to the first bent point c1 of the leg base elastic elastic member 13 is pressed from the rear part of the crotch of the wearer to the groin, and the first bent point c1. The more rear part is pressed from the wearer's groin to the upper part of the thigh fascia latae muscle. Further, the portion having the second bending point c2 to the third bending point c3 is pressed over the entire crotch of the wearer, and the portion from the third bending point c3 to the fifth bending point c5 has the fourth bending point c4. The portion is pressed along the convex portion of the adductor muscle group with the apex as the apex, and the portion in front of the fifth bending point c5 is pressed against the wearer's buttocks. In this way, by providing the elastic elastic member 13 in an arrangement adapted to the complicated shape around the base of the leg, not only static fit but also dynamic fit is improved, for example from the supine position The shape of the diaper can easily follow the shape change around the base of the leg when changing from the sitting position to the supine position. As a result, an unnecessary space is hardly formed between the diaper and the base of the leg, and leakage is less likely to occur. For comparison, a photograph of a conventional disposable diaper wearing state is shown in FIG. This conventional disposable diaper does not have an elastic elastic member that overlaps with the absorber 3 like the above-mentioned leg-base elastic elastic member 13, and in the front-rear direction at the same position as the leg-around elastic elastic member 14 described later. 3 elongated elastic elastic members arranged in a straight line along the back, mounted on a dummy doll in a supine position, and repeated posture changes 10 times after returning from lying on the back to sitting on the back. Indicates a state (turning or a gap is present).

Here, the position of each bending point is assumed to be a disposable diaper for adults. Specifically, the overall length is about 700 to 1000 mm, the length corresponding to the edge Le of the leg opening is about 300 to 550 mm, and within the range of 110 to 90 mm on the rear side with respect to the diaper longitudinal center line LC. The width in the range from about 10 mm on the rear side to the position on the front side of 15 mm with respect to the center line LC in the diaper longitudinal direction is about 40 to 100 mm in the range from the center line LC in the diaper longitudinal direction to the center line LC in the diaper longitudinal direction. The width in the range of 130 to 165 mm on the front side is about 90 to 150 mm, and the width in the range of 160 to 215 mm on the front side is about 140 to 210 mm with respect to the center line LC of the diaper, and the center line LC in the front and rear direction of the diaper Especially suitable for disposable diapers whose width in the range of 175 to 245 mm on the front side is about 160 to 260 mm It is intended. Further, in the sample of the diaper shown in FIG. 9, the positions of the respective bending points with respect to the diaper longitudinal center line LC are as follows: first bending point c1: rear side 90 mm, second bending point c2: front side 10 mm, third bending point c3: Front side 130 mm, fourth bending point c4: front side 170 mm, fifth bending point c5: front side 235 mm.

On the other hand, when the above-mentioned leg-base elastic stretchable member 13 is provided for a disposable diaper of a general design, the leg-base portion extends over at least the front-rear direction range A1 corresponding to the edge Le of the leg opening on both sides of the diaper. A leg surrounding portion LH that protrudes outward in the width direction from the portion of the elastic elastic member 13 is formed, and at least from the second bending point c2 of the leg-base elastic elastic member 13 of the both sides of the absorbent body 3. A portion corresponding to the portion up to the third bending point c3 in the front-rear direction extends to the intermediate portion in the width direction of the leg-surrounding surrounding portion LH. Therefore, the leg-surrounding elastic member 13 alone does not allow the outer leg surrounding portion LH to be pressed around the leg, and therefore excrement may leak from the absorber side located in the surrounding portion LH. There is. In order to solve this, it is conceivable to narrow the width of the absorbent body 3 in the portion including the crotch portion, but it is not preferable because it is difficult to secure the amount of absorption in the crotch portion, which is the most important portion.

Therefore, in the illustrated form, the absorbent body 3 is provided over at least the front-rear direction range A1 corresponding to the edge Le of the leg opening, and at least the second bending point c2 to the third bending point c2 in the leg-base elastic member 13 of the both sides. The part corresponding to the part up to the bending point c3 in the front-rear direction extends to the intermediate part in the width direction of the leg surrounding part LH, and extends to each leg surrounding part LH along the edge Le of the leg opening. The leg elastic elastic member 14 is attached in a state of being stretched along its extending direction. In this way, when the leg elastic member 14 extending along the edge Le of the leg opening is provided not only on the leg elastic base member 13 but also on the leg surrounding portion LH that protrudes outward in the width direction. The leg surrounding portion LH is pressed around the leg, and leakage from the leg is less likely to occur.

The number of elastic elastic members 14 around each leg on the left and right sides can be determined as appropriate, but about 3 to 10, more preferably about 3 to 8, and particularly about 4 to 6, are appropriate. It is a book. When the number of the leg elastic members 14 on the left and right sides is plural, the interval is about 1 to 20 mm, preferably about 2 to 15 mm, particularly preferably about 6 to 10 mm. In addition, as the elastic elastic members 14 around each leg, styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, which are formed in a thread shape, a string shape, a belt shape, or the like. Normally used materials such as polyester can be used, and the thickness is preferably about 500 to 1500 dtex, and in the case of natural rubber, about 0.1 to 3 mm, particularly about 0.5 to 3 mm. Further, it is preferable that the elongation ratio when the elastic elastic members 14 around the legs are fixed is about 150 to 250%.

Further, as shown in the figure, when the number of the leg elastic elastic members 14 on the left and right sides is plural, at least some of the leg elastic elastic members 14 are at least in the leg-base elastic elastic members 13. The portion from the second bending point c2 to the third bending point c3 and the portion corresponding in the front-rear direction are arranged so as to pass between the side edge of the absorber 3 and the edge Le of the leg opening, The elastic elastic member 14 passes through a position where at least a portion corresponding to the second bending point c2 to the third bending point c3 in the leg-base elastic elastic member 13 in the front-rear direction overlaps with the side portion of the absorber 3. It is preferable to arrange them as follows. In this way, the leg elastic member 14 is provided in a proper position, and both the widthwise inner part having the absorber 3 and the widthwise outer part not having the absorber are pressed around the leg, thereby surrounding the leg. The entire portion LH fits evenly around the legs, further improving the leakage prevention effect.

On the other hand, in order to further improve the fit with respect to the circumference of the above-mentioned leg root, as shown in FIG. A slit 3X is formed along the direction of passage of the leg-attached elastic base member 13. In the illustrated example, the slit 3 </ b> X is formed by a linear cutout portion whose front end reaches the periphery of the absorber 3 and opens, but can also be formed as a hollow that does not reach the periphery of the absorber 3. Moreover, when the absorber 3 has a laminated structure of a plurality of layers as in the illustrated example, it is preferable to form slits 3X in all the

layers

3A and 3B as illustrated, but some layers (single or plural may be used). ). Moreover, it may replace with the slit 3X and may form the linear compression part by embossing.

The dimensions of the slit 3X can be determined as appropriate. The width of the slit 3X is preferably about 10 to 25 mm from the viewpoint of ease of manufacture. In the illustrated example, the slit 3X is formed on substantially the entire portion where the portion between the second bending point (rear-side bending point) c2 and the fourth bending point (front-side bending point) c4 of each leg base elastic member 13 passes. It is formed in a bent line shape along the passing direction. Also in other types of disposable diapers in which the arrangement of the leg-attached elastic base members 13 is different, the same longitudinal direction as the portion between the second bending point (rear bending point) c2 and the fourth bending point (front bending point) c4. It is preferable to provide a slit 3X in the range.

By providing such a slit 3X, as shown in FIG. 9, due to the action of the contracting force of the leg-attached elastic elastic member 13, the leg-attached elastic elastic member 13 of the part having the absorbent body 3 in the crotch part is provided. When the passing part is pressed against the base of the leg from the crotch to the inner side of the thigh, the absorbent body 3 is securely bent along the slit 3X, and the corners fit more appropriately to the base of the leg. Of the portion having the absorbent body 3, the portion on the outer side in the width direction with respect to the passage portion of the leg base elastic elastic member 13 fits more appropriately from the base of the leg to the periphery of the leg, and the inner portion in the width direction is the base of the leg Fit more appropriately from the crotch to the crotch.

Also, characteristically, a plurality of leg-base elastic stretch members 13 are provided on both sides of the diaper width direction center line WC, and at least one of the plurality of leg-base elastic stretch members 13 on each side. Is disposed so as to pass through the region of the slit 3X, and at least one other is disposed so as to pass through a portion overlapping the absorber 3 on the outer side in the width direction of the region of the slit 3X. Thereby, the leg base elastic elastic member 13 that passes through the region of the slit 3X forms a firm corner at the bent portion of the absorbent body 3 and firmly presses the corner against the leg base. The leg base elastic elastic member 13 passing through the outside in the width direction of the slit 3X can firmly press the portion outside in the width direction from the bent portion from the base of the leg to the periphery of the leg.

On the other hand, the intervals between the plurality of leg base elastic stretch members 13 are narrowed toward the front side, and the plurality of leg elastic stretch members 14 are narrowed toward the front and rear sides. In addition, the front and rear sides of these elastic

elastic members

13 and 14 are provided over the waist side side flap portion SF (waist side from the edge Le of the leg opening), and the fixing portion 5f of the fastening tape 5 on the back side. It extends toward the position overlapping with the front target tape 6 on the ventral side.

Moreover, in the part which overlaps the front-and-rear both-ends part in the leg base part and the leg periphery elastic expansion-

contraction members

13 and 14, the adjacent sheet (back sheet 1 and exterior sheet 12) which clamps the leg base part and leg periphery

elastic expansion members

13 and 14 is held. The non-fixed area is not fixed, and the leg base and the leg

elastic members

13 and 14 are not fixed to the adjacent sheets (back sheet 1 and exterior sheet 12) in this area. This is because the elastic

elastic members

13 and 14 are cut at the same time by cutting at the front and rear edges performed at the time of manufacturing, and the leg bases and the front and rear ends of the leg elastic

elastic members

13 and 14 are contracted and drawn between adjacent sheets. This is to prevent it from protruding from the front and rear edges. As a result, as shown by a dotted line in FIG. 13, a cylindrical passage 12 r formed of a non-fixed region is formed between the exterior sheet 12 and the backsheet 1. The passage 12r is open at the front and rear edges of the product. The

seats

1 and 12 are fixed to each other at portions overlapping the leg base and other portions (intermediate portions in the front-rear direction) of the leg

elastic base members

13 and 14, and the leg base and leg elastic elastic members are fixed in the fixing region. 13 and 14 are bonded and fixed to both

sheets

12 and 1 in an extended state.

The position of the cylindrical passage 12r extends from the waist side end edge to the lower edge of the front target tape 6 on the abdominal side, and the leg base and leg elastic elastic members 13 from the lower end opening of the passage 12r. 14 have been introduced. As a result, by extending the width of the target tape 6 to the vicinity of both ends of the abdominal waist side flap SF, or extending to the crotch side, the leg-attached root portion and the leg elastic

elastic members

13 and 14 are formed. Even if it is arranged to intersect with the target tape 6, the contraction force of the leg base and leg

elastic members

13, 14 does not act on the target tape 6, and the leg base and leg

elastic members

13, 14. The target tape 6 does not wrinkle due to the shrinkage force. Therefore, a sufficient coupling force can be obtained over the entire target tape 6.

In the ventral portion F, the leg base and the leg

elastic members

13 and 14 are crotch side edges of the passage 12r while maintaining a certain distance (for example, about 2 to 10 mm, particularly about 3 to 10 mm). It is preferable to provide so that it may reach. In this manner, when the leg bases on the left and right sides and the leg elastic

elastic members

13 and 14 are arranged so that the distance decreases from the crotch part toward the front side, a plurality of elastic

elastic members

13 and 14 are provided. Has a certain distance in the width direction at a position intersecting the crotch side edge of the passage 12r, it is difficult for the contracting force to concentrate on the boundary between the passage 12r which is a non-adhering region and the fixing region on the crotch side. In addition, the deterioration of fit and appearance can be prevented.

However, in this case, if the target tape 6 is provided over a wide range also on the crotch side, the non-adhesion area becomes excessive, and there is a possibility of causing problems such as strength reduction. This is especially true when the passage 12r, which is a non-fixed area, is provided by a rectangular adhesive pattern. Accordingly, as shown in the drawing, the distance between the leg base and the leg elastic

elastic members

13 and 14 is reduced (that is, the side edge of the passage 12r follows the curve of the adjacent elastic elastic member), It is preferable to reduce the width from the crotch side edge of the target tape 6 toward the waist side edge in the abdominal side portion. Since it is difficult to continuously change the width of the non-fixed region in a normal diaper production line, it is preferable to form the non-fixed region in a stepped manner as shown in the figure. In particular, when the leg base portion and the leg

elastic members

13 and 14 have a pattern as shown in the drawing, the side edge on the outer side in the width direction of the passage 12r is linearly formed along the front-rear direction. It is preferable that only the side edge on the center side in the direction be bent stepwise.

In the above example, the leg bases and the portions in the passage 12r (non-adhesion region) of the leg

elastic members

13 and 14 are not fixed to both the adjacent sheets (back sheet 1 and exterior sheet 12). However, it may be fixed to the back sheet 1 as the inner sheet.

On the other hand, unlike the illustrated embodiment, the position of the passage 12r on the back side is preferably provided in a portion that does not overlap with the fixing portion 5f of the fastening tape 5 because the fixing strength of the fixing portion 5f of the fastening tape 5 is increased.

The present invention is suitable for tape-type disposable diapers as in the above example, but can be used for all disposable diapers including pants.

It is a top view which shows the inner surface side of the expansion | deployment state of a tape-type disposable diaper. It is a top view which shows the outer surface side of the expansion | deployment state of a tape-type disposable diaper. FIG. 3 is a sectional view taken along line iii-iii in FIG. FIG. 4 is a sectional view taken along line iv-iv in FIG. 1. FIG. 5 is a vv cross-sectional view of FIG. 1. It is an enlarged view of a fastening tape part. It is an enlarged view of the other fastening tape part. It is an enlarged view of the other fastening tape part. It is a photograph which shows the state which made the dummy doll wear the prototype of the disposable diaper of embodiment. It is a top view which shows the positional relationship of an absorber, a leg base elastic | stretch elastic member, and a leg periphery elastic | stretch elastic member. It is a top view which shows roughly the example of the attachment line of the elastic elastic member at the time of manufacturing a fastening tape. FIG. 12 is a cross-sectional view taken along the line vi-vi in FIG. 11. It is a photograph of the upper end part of the non-stretched fastening tape part in the prototype of the disposable diaper of the embodiment. It is a photograph of the upper end part of the fastening tape part of the extension state in the prototype of the disposable diaper of an embodiment. It is a photograph which shows the state which put the conventional disposable diaper on the dummy doll.

DESCRIPTION OF SYMBOLS 1 ... Liquid impervious back sheet, 2 ... Liquid permeable top sheet, 3 ... Absorber, 3X ... Slit, 4 ... Side part barrier sheet, 5 ... Fastening tape, 6 ... Target tape, 7 ... Elongated elastic expansion / contraction Members 9 ... hook tape, 10 ... perforation, 12 ... exterior sheet, 13 ... leg elastic elastic member with leg, 14 ... elastic elastic member around leg, 20 ... elongated elastic elastic member, 30 ... back barrier sheet, 40 ... Dorsal elastic part.

Claims

A support part having a crotch part, and a ventral part and a dorsal part extending respectively to the front side and the rear side of the crotch part;
In the portion including the crotch portion of the support portion, an absorbent body arranged to extend with a predetermined width along the diaper width direction center line,
On both sides of the diaper width direction center line in the support portion, the portion extending in the front-rear direction from the abdominal portion through the crotch portion to the back side portion and at least the portion located in the crotch portion of the absorbent body An elongated leg base elastic elastic member is provided so as to pass through the part overlapping both sides,
A slit or a linear compression part is formed in part or all of the passage part of the leg base elastic elastic member on both sides of the absorbent body along the passage direction of the leg base elastic elastic member,
A plurality of the leg-base elastic stretch members are arranged in parallel on both sides of the diaper width direction center line, and at least one of the leg-base elastic stretch members on each side is the slit or line. Arranged so as to pass through the area of the compression section, and at least one other is arranged so as to pass through the portion overlapping the absorber on the outside in the width direction of the area of the slit or linear compression section,
A disposable diaper characterized by that.
The slit or the linear compression section is at least 160 to 160 mm from the front-rear direction position from the position of 10 mm on the rear side to the position of 15 mm on the front side with respect to the center line in the front-rear direction of the diaper, The disposable diaper of Claim 1 extended to the position of the front-back direction of 215 mm.
A portion overlapping each side of the absorber in each leg base elastic elastic member,
The diaper is located within a range from a position 10 mm on the rear side to a position 15 mm on the front side with respect to the center line in the diaper front-rear direction and a distance from the center line in the diaper width direction within a range of 40 to 30 mm. The rear bending point closest to the center line in the width direction and the front side of the diaper longitudinal center line within a range of 160 to 215 mm, and the distance from the diaper width direction center line is within a range of 80 to 95 mm The front bending point located in the order, and the rear bending point and the front bending point have a bent line shape that bulges to the center in the width direction,
Of the both sides of the absorbent body, along part or all of the part through which the portion between the rear bending point and the front bending point of each leg-base elastic elastic member passes, along the passing direction of the elongated elastic elastic member. The slit or linear compression part is formed,
The disposable diaper according to claim 1.
Each leg base elastic elastic member is
A first bending point located within the range of 110 to 90 mm on the rear side with respect to the diaper front-rear center line and having a separation distance from the diaper width direction center line of 100 to 110 mm;
The second position is within a range from a position of 10 mm rearward to a position of 15 mm frontward with respect to the center line in the diaper longitudinal direction and a distance from the center line in the diaper width direction within a range of 40 to 30 mm. Inflection point,
A third bending point located within a range of 130 to 165 mm in front of the diaper front-rear direction center line and having a distance from the diaper width direction center line of 65 to 55 mm;
A fourth bending point located within a range of 160 to 215 mm in front of the diaper longitudinal center line and a distance from the diaper width direction center line of 80 to 95 mm; and a diaper longitudinal center A bent line is formed in this order through a fifth bending point located in the range of 175 to 245 mm in front of the line and spaced from the central line in the diaper width direction by 90 to 120 mm. ,
The distance from the central line in the diaper width direction decreases from the portion behind the first bending point to the second bending point, and the second bending point is the closest to the central line in the diaper width direction at the second bending point. From the point to the front side of the fifth bending point has a slope that increases the separation distance from the central line in the diaper width direction,
The first bending point and the fourth bending point have a bent shape that bulges outward in the width direction, and the second bending point, the third and fifth bending points have a bent shape that bulges toward the center in the width direction. And
Among the both sides of the absorbent body, in a part or all of a portion through which a portion between the second bending point and the fourth bending point of each leg base elastic elastic member passes in the passing direction of the elongated elastic elastic member. Along the slits or linear compression parts are formed,
The disposable diaper according to claim 1.
On both sides of the support portion, there are provided leg surrounding portions that protrude outward in the width direction from the portion of the leg base elastic elastic member over at least the front-rear direction range corresponding to the edge of the leg opening. ,
The absorber is provided over at least the front-rear direction range corresponding to the edge of the leg opening, and at least the portion from the second bending point to the third bending point in the leg-base elastic elastic member of both sides thereof and the front-rear direction The corresponding part in the direction extends to the intermediate part in the width direction of the leg surrounding portion,
A leg elastic elastic member extending along the edge of the leg opening is attached to each leg surrounding portion in a state of being extended along the extending direction.
The disposable diaper according to claim 4.
A plurality of the leg elastic members are provided at predetermined intervals, and at least some of the leg elastic members are at least a third bent from the second bending point of the leg elastic member. The portion corresponding to the point and the portion corresponding in the front-rear direction are arranged so as to pass between the side edge of the absorber and the edge of the leg opening, and the remaining elastic members around the leg are at least the leg base elastic The disposable diaper according to claim 5, wherein a portion corresponding to the front-rear direction and a portion from the second bending point to the third bending point of the elastic member is disposed so as to pass through a position overlapping the side portion of the absorber. .