JP6008383B2 - Pants-type disposable diaper and method for manufacturing the same - Google Patents

Description

  The present invention relates to a pants-type disposable diaper and a method for manufacturing the same that improve shrinkage-fitting fit by a cracked part width direction elastic elastic member and prevent shrinkage in the width direction of the edge of a leg opening in the back body.

  The pants-type disposable diaper includes an exterior sheet having a front body and a back body, and an interior body including an absorbent body fixed to the inner surface of the exterior sheet, and the front body and the back body of the exterior sheet are on both sides. Are joined together to form a waist opening and a pair of left and right leg (leg) openings.

  In the pants-type disposable diaper, in order to improve the fit to the body, various elastic members are fixed to the exterior sheet in an expanded state (see, for example, Patent Documents 1 to 7). The one provided with the waist elastic member, the waist elastic member, and the curved elastic member (represented in Patent Document 6) has a relatively high fit to the body. Here, a plurality of waist elastic members are arranged parallel to the edge of the waist opening along the width direction at intervals in the vertical direction. Further, the waist elastic member is disposed along the width direction with a space in the vertical direction in a region closer to the center in the front-rear direction than the waist elastic member. Furthermore, the curved elastic member extends while curving from both side portions of at least one of the front body and the back body so as to go to the opposite body side toward the center in the width direction.

  However, in the conventional general pants-type disposable diapers, there is a problem that the crotch part is mokomoko unlike ordinary underwear. And according to the study by the present inventors, one of the causes of this problem is that the absorbent body floats from the body in the part from the rupture to the crotch, that is, the fit at the part is insufficient. Met.

  In order to improve the fit of the crack for this problem, various forms such as a curved elastic member at the back of the body that protrudes convexly toward the waist opening at the crotch crossing are proposed. (For example, see Patent Documents 8 and 9) Although the inner surface of the diaper has a shape that fits the crack, it is difficult to maintain the fitted state. There is also a problem that it is necessary to change the direction of the member to a steep angle, and it is difficult to manufacture by a high-speed line.

  Furthermore, as a solution to this problem, as shown in FIG. 13, the exterior sheet 20 in the back body B extends while curving from both sides along the leg opening edge 29 toward the front body F side. The elongated dorsal curved elastic member 26 is fixed in a state of extending in the extending direction, and an elongated elastic member extending across the crack facing portion in the back body B in the width direction is provided. It was considered to form the bent fitting portion 40 that bends so as to enter the wearer's crack by the contraction action of the crack portion width direction elastic member 27 in the width direction. Accordingly, the bent fitting portion 40 for the crack can be formed by the arrangement along the width direction of the cracked portion width direction elastic member 27 without changing the dorsal curved elastic member 26 to a steep angle. Can be manufactured.

JP-A-7-265357 JP-A-7-299094 JP-A-11-36103 JP 2001-258931 A JP 2001-204762 A JP 2006-043415 A Special table 2007-113978 gazette JP 2007-97621 A JP 2008-253289 A JP 2002-209942 A Japanese Patent Laid-Open No. 2005-087622

  However, when the cracked portion width direction elastic member 27 is simply provided up to the edge of the leg opening, as shown in FIG. 13, the edge of the leg opening in the back body B is bent around the leg by the curved elastic members 26 and 28. As a result of shrinking not only in the width direction but also in the width direction, the edge becomes stiff and deteriorates the feeling of wearing, or the edge of the edge turns outward to expose the side part of the interior body and deteriorate the appearance. There was a problem such as letting.

  Then, the main subject of this invention is preventing the width direction shrinkage | contraction of the edge part of the leg opening in a back body, improving the fitting property with respect to a crack by a crack part width direction elastic elastic member.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An exterior sheet that forms a front body and a back body, and an interior body including an absorbent body that is fixed to an inner surface of the exterior sheet, and both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body Are joined to form a side seal portion, thereby forming a waist opening and a pair of left and right leg openings,
The inner body fixing region fixed to the inner body, and the lateral extension of the inner body fixing region on both sides in the width direction of the crack facing part of the outer body sheet of the rear body extends laterally from the side edge of the inner body fixing region. In a pants-type disposable diaper having a protruding part,
It said elongated anal cleft width direction elastic member whole across the intergluteal cleft facing portion extends in the width direction is fixed to the outer sheet,
The crack facing portion can be expanded and contracted in the width direction together with the crack portion width direction elastic member,
Site adjacent to the side of the intergluteal cleft facing portion, the gluteal cleft width direction elastic member is finely cut, together with the contraction force is uncontracted portion that does not act, the overall lateral than the non-contracted parts The non-existing portion of the cracked portion width direction elastic member,
A pants-type disposable diaper characterized by that.

(Function and effect)
In the present invention, in the longitudinal range having the cracked portion width direction elastic member, the cracked portion width direction elastic member is finely cut at a portion adjacent to the side of the crack facing portion, so that it does not substantially shrink. Since the part is formed, the crack facing part between them becomes a three-dimensional bent fitting part that enters the wearer's crack by the contraction action of the crack part width direction elastic member, and on both sides in the width direction In the non-shrinkable part, the inner body is shaped to fit the bottom without shrinking unnecessarily. And since the width direction contraction force by the crack part width direction elastic member does not act on the side, the edge part of a leg opening becomes hard and a feeling of mounting | wearing is not deteriorated, or the said edge part does not droop outside. In addition, since the cracked portion width direction elastic member is provided along the width direction, it can be manufactured not only at a low cost but also stably by a high speed line.

<Invention of Claim 2>
The exterior sheet is formed by bonding an outer layer and an inner layer,
The cracked portion width direction elastic member is sandwiched between the outer layer and the inner layer and fixed to the outer layer and the inner layer by a hot melt adhesive,
The application amount of the hot melt adhesive for fixing the crack part width direction elastic member is larger in the non-existing part of the crack part width direction elastic member than the existing part of the crack part width direction elastic member. Few,
The pants-type disposable diaper according to claim 1.

(Function and effect)
As described above, the amount of the hot melt adhesive for fixing the cracked portion width direction elastic member is set to be larger in the portion where the cracked portion width direction elastic member is not present than in the portion where the cracked portion width direction elastic member is present. Even if it is a structure with few, since a crack part width direction elastic member does not exist, intensity | strength does not fall, but the edge part of a leg opening can be made flexible rather. Furthermore, as can be seen from the manufacturing method described later, after attaching the cracked portion width direction elastic member over the entire width direction, only by finely cutting only the region that becomes the non-stretchable portion in the cracked portion width direction elastic member, The lateral part of the cracked part width direction elastic member is drawn into the part that will be cut later by punching out the leg opening, and the non-existing part of the cracked part width direction elastic member is automatically formed. Will come to be. Note that a small amount of hot melt adhesive applied includes not applying at all.

<Invention of Claim 3>
From the right side seal part of the back body to the front side along the right leg opening edge of the back body, it curves toward the left side and leads to the crack facing part located in the center in the width direction of the back body, Folded back at the crack-facing part, curved further toward the left side and toward the rear side, and led to the left side seal part of the back body along the left leg opening edge of the back body; A side-curved elastic member is fixed to the exterior sheet,
The portion having the dorsal curved elastic member in the exterior sheet can be expanded and contracted in the longitudinal direction of the dorsal curved elastic member together with the dorsal curved elastic member,
The back-side curved elastic member also has a portion finely cut at the non-shrinkable portion,
A plurality of the back-side curved elastic members and the cracked portion width direction elastic members are provided at intervals, and at least one back-side curved elastic member passes through the non-existing portion of the cracked portion width direction elastic member and The pants-type disposable diaper according to claim 1, wherein the pants-type disposable diaper is configured to be continuous up to a contracted portion.

(Function and effect)
If the shrinkage in the width direction of the edge of the leg opening is only reduced, the non-contracted portion by cutting the cracked width direction elastic member is provided at the edge of the leg opening while the cracked width direction elastic member is provided over the entire width direction. Even if it is expanded to a part, it does not mean that there is no effect, but rather it is easy to manufacture. However, in the case of adopting a configuration in which the back side curved elastic member is provided and the crotch portion is pulled backward, it is preferable that the back side curved elastic member passes through the edge of the leg opening and continues to the interior body fixing portion or the vicinity thereof. And, while adopting this form, when expanding the non-contracted part by cutting the cracked part width direction elastic member to the edge of the leg opening, it will cut even the dorsal curved elastic member during manufacturing, It will be the result of a fall. On the other hand, as described above, when the dorsal curved elastic member continues to the non-contracted portion through the non-existing portion instead of the non-contracted portion of the cracked portion width direction elastic member, the dorsal curved elastic member more effectively. Therefore, the crotch part is pulled up rearward, and the back-side curved elastic member is not cut during manufacture.

<Invention of Claim 4>
An exterior sheet that forms a front body and a back body, and an interior body including an absorbent body that is fixed to an inner surface of the exterior sheet, and both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body Are joined to form a side seal portion, thereby forming a waist opening and a pair of left and right leg openings,
In the longitudinal range corresponding to the leg opening, the side portions in the width direction of the exterior sheet overlap side portions that overlap the side portions of the interior body, and the lateral sides that extend laterally from the side edges of the interior body. And an edge portion of the leg opening is formed by a side edge of the lateral extension portion,
In the longitudinal range corresponding to the leg opening in the exterior sheet, an elongated widthwise elastic member extending in the width direction across a predetermined portion in the middle in the width direction is stretched at a predetermined elongation rate in the extending direction. It is fixed in the state,
The width direction elastic member is finely cut at a portion adjacent to the side of the predetermined portion to form a non-shrink portion where the contraction force does not act, and the entire side of the width direction elastic member is formed from the non-shrink portion. It is considered as a nonexistent part,
In the manufacturing method of pants-type disposable diapers,
The continuous strip-shaped outer layer and the continuous strip-shaped inner layer are bonded together while being transported along the continuous direction, and the width direction elastic member is sandwiched between the outer layer and the inner layer along the transport direction in the stretched state and the outer side. An exterior sheet assembling step for forming a continuous strip to be the exterior sheet by fixing with a hot melt adhesive to the inner layer and the inner layer;
In the continuous belt-like body to be the exterior sheet, a leg opening excision step of excising a portion to be the leg opening with a predetermined interval in the transfer direction;
In the exterior sheet assembling step, the application amount of the hot melt adhesive for fixing the width direction elastic member in the region that is the non-existing portion of the width direction elastic member and the side region of the portion that is the leg opening, Less than other areas,
After the outer sheet assembling step and before the leg opening excision step, by cutting the width direction elastic member finely in a region that becomes the non-shrinkable portion, The width direction elastic member located in the side region of the region to be the region and the leg opening is contracted and drawn into the portion to be the leg opening,
In the leg opening excision step, excising a portion to be a leg opening that has pulled in the width direction elastic member,
A method for producing a pants-type disposable diaper characterized by the above.

(Function and effect)
According to the present invention, only by changing the amount of adhesive applied and cutting the width direction elastic member, the width direction elastic elastic member provided in the vertical range corresponding to the leg opening does not exist at the edge of the leg opening. Diapers can be manufactured.

<Invention of Claim 5>
5. The pants-type disposable diaper according to claim 4, wherein the predetermined portion is a crack facing portion, and the width-direction elastic member is a crack-width elastic member extending in the width direction across the crack facing portion. Manufacturing method.

(Function and effect)
According to the invention described in this section, the same thing as the pants-type disposable diaper according to claim 1 can be manufactured by only cutting the adhesive application amount changing width and the directional elastic member.

  As described above, according to the present invention, there are advantages such as excellent cracking and fit on both sides in the width direction, and the edge of the leg opening in the back body is difficult to bend.

It is a top view (inner surface side) of the underpants type disposable diaper of a deployment state. It is a top view (outer surface side) of the underpants type disposable diaper of a deployment state. It is a principal part top view of the underpants type disposable diaper of an unfolded state. It is CC sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view which shows an adhesive agent application pattern. It is a top view which shows an elastic member cut pattern. It is a perspective view of the wearing state of a pants type disposable diaper. It is a rear view of the wearing state of a pants type disposable diaper. It is DD sectional drawing of FIG. It is a rear view of the mounting state of a comparative example. It is a principal part enlarged plan view. It is a front view which shows an exterior sheet assembly process schematically. It is a top view which shows the change of an exterior sheet assembly process roughly. It is a top view which shows the change of a non-expandable part formation process roughly. It is a top view which shows the change of a leg opening cutting process roughly. It is a top view which shows roughly the change after an interior body sticking process. It is a top view which shows roughly the change of the non-expandable part formation process in a comparative example. It is a top view which shows roughly the change of the leg opening cutting process in a comparative example.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The term “elongation rate” means a value when the natural length is 100%.
1-11 has shown the underpants type disposable diaper 1 of embodiment. The pants-type disposable diaper 1 (hereinafter also simply referred to as a diaper) includes an exterior sheet 20 that forms a front body F and a back body B, and an interior body 10 that is fixed and integrated with the inner surface of the exterior sheet 20. The interior body 10 is formed by interposing an absorber 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12. In manufacturing, after the back surface of the interior body 10 is fixed to the inner surface (upper surface) of the exterior sheet 20 by a joining means such as a hot melt adhesive G, the interior body 10 and the exterior sheet 20 are the front body F and the back body. Folded at the center in the longitudinal direction (front-rear direction) which is the boundary of B, and both side portions thereof are joined to each other by heat welding or hot melt adhesive, etc., and side seal portions 21 and 22 are formed, thereby forming a waist opening and The pants-type disposable diaper is formed with a pair of left and right leg openings.

(External sheet structure example)
As shown in FIGS. 4 to 6, the exterior sheet 20 is a two-layer structure sheet in which an inner layer 20 </ b> A and an outer layer 20 </ b> B each made of a nonwoven fabric are bonded together by a hot-melt adhesive, and the outer layer 20 </ b> A and the outer layer 20 </ b> A Various elastic members 24 to 28 are sandwiched and fixed in a stretched state between the nonwoven fabrics of the folded portion 20C formed by folding the outer layer 20B to the inner surface side at the waist opening edge between the layers 20B and imparting elasticity. The planar shape forms a pseudo hourglass shape as a whole by the concave leg opening edges 29 formed to form the leg openings on both sides of the middle. As the elastic members 24 to 28, synthetic rubber or natural rubber formed into an elongated shape such as a thread shape, a string shape, or a belt shape can be used.

  In particular, in the illustrated exterior sheet 20, as shown in FIGS. 1 to 3, in each of the front body F and the back body B, a waist elastic member 24 disposed in the vicinity of the waist opening 23, and waist elasticity Separately from the waist elastic members 25 and the waist elastic members 25, which are arranged on the crotch side with respect to the members 24 and spaced in the longitudinal direction along the width direction, and the waist elastic members 25, the front body F and the rear Extending from both side seal portions 21 and 22 joining the body B to the portion overlapping the both side portions of the interior body 10 while curving toward the opposite body side along the leg opening edge 29 toward the center in the width direction. And a plurality of curved elastic members 26 and 28 arranged at intervals without crossing each other. In the exterior sheet 20, since the curved elastic members 26 and 28 ensure the fit around the legs, the leg elastic members substantially continuous from the front body F to the back body B along the leg opening edge 29. Is not provided, but may be provided together with the curved elastic members 26 and 28.

  The waist elastic member 24 is a plurality of thread rubber-like elastic members disposed in the vertical direction near the waist opening edge in the vertical range having the side seal portions 21 and 22 and spaced in the vertical direction. It is intended to attach the waist opening edge of the diaper to the body by giving stretch force to tighten around the waist part of the body by being fixed to the exterior sheet in the stretched state in the present direction (width direction of the diaper) is there. For the waist elastic member 24, rubber thread is used in the illustrated example. However, for example, a tape-like elastic member may be used. Moreover, although the waist part elastic member 24 of the illustration form is clamped between the nonwoven fabrics of the folding | returning part 20C of the outer side layer 20B in a waist part, you may clamp between 20 A of inner side layers, and the outer side layer 20B.

  The waist elastic member 25 has a longitudinal direction with an interval in the vertical direction over a range from the upper part to the lower part in the longitudinal range corresponding to the side seal portions 21 and 22 and the range on the crotch side. The elastic body is an elongated elastic member such as a rubber thread disposed along the front and back of the front body F and the back body B by being fixed to the exterior sheet in an extended state in the extending direction (width direction of the diaper). It is intended to give the diaper tightly contact with the body by giving each of the surrounding parts a stretching force in the width direction. Note that the boundary between the waist elastic member 24 and the waist elastic member 25 is not necessarily clear. For example, among the elastic members arranged in the width direction with an interval in the vertical direction on the front body F and the back body B, even if the number cannot be specified, several on the upper side function as the waist elastic members. The remaining elastic members only have to function as waist elastic members.

  In the back body B, the dorsal curved elastic member 26 disposed separately from the waist elastic member 25 has an acute angle crossing angle θ (hereinafter also referred to as a vertical crossing angle) with the vertical direction in the middle in the longitudinal direction. A predetermined curve having a minimum point that becomes the minimum and the longitudinal crossing angle θ increases within a range of 0 degrees to 90 degrees from the minimum point toward both sides in the width direction, and the diaper is unfolded It is arranged along a predetermined curve having a crossing portion 70 having a vertical crossing angle θ of 60 ° or less in a region overlapping with both side portions of the interior body 10, and the exterior is stretched in its extending direction. It is fixed to the seat. There may be one dorsal curved elastic member 26, but it is preferable that there are a plurality of dorsal curved elastic members 26. In the illustrated example, there are five elastic rubber-like elastic members, and these dorsal curved elastic members 26 intersect each other. There are no gaps. This dorsal curved elastic member group 26 is not arranged so that a few bundles of elastic elastic members of about two or three are closely packed, but a predetermined interval so as to form a predetermined elastic zone. Multiple or more are arranged with a gap.

  In the front body F, the ventral curved elastic member 28 disposed separately from the waist elastic member group 25 has a minimum point at which the longitudinal crossing angle θ with the vertical direction is minimum in the middle in the longitudinal direction, A predetermined curve in which the longitudinal crossing angle θ increases within a range of 0 to 90 degrees from the minimum point toward both sides in the width direction, and overlaps with both sides of the interior body 10 in a state where the diaper is unfolded It is arranged along a predetermined curve having a crossing portion 70 in which the longitudinal crossing angle θ is 60 ° or less, and is fixed to the exterior sheet in an extended state in the extending direction. There may be one ventral curved elastic member 28, but preferably there are a plurality of ventricular curved elastic members 28. In the illustrated example, there are five thread-like elastic members, and these ventral curved elastic members 28 do not cross each other. , Spaced apart. This abdomen curved elastic member group 28 is not arranged so that a few bundles of elastic stretch members are spaced substantially apart from each other, but a predetermined interval is formed so as to form a predetermined stretch zone. Multiple or more are arranged with a gap.

  The curved elastic members 26 and 28 do not have to be entirely curved as in the illustrated example, and may partially have linear portions. When the curved elastic members 26 and 28 are provided on both the front body F and the back body B, the curved elastic members 26 and 28 are disposed on the back body B side and a part or all of the group of curved elastic members disposed on the front body F side. A form (not shown) in which a part or all of the group of curved elastic members B intersects with the crotch part or in the vicinity of the front side or the rear side thereof can also be adopted, but is arranged on the front body F side as in the illustrated example. The group of curved elastic members 28 and the group of curved elastic members B arranged on the back body B side are not separated from each other in the longitudinal direction at a position slightly deviated from the front-rear intermediate portion, particularly the front body F. The vertical separation distance is preferably about 10 to 20 mm.

  On the other hand, in the illustrated example, the waist elastic member 25 and the curved elastic members 26 and 28 disposed in the front body F and the back body B are not provided in a portion crossing the interior body 10, and the portion is not stretchable. It is an area. Thus, the form which does not have or is not provided with the elastic member includes the form in which the elastic member is present, but also the form in which the elastic member is present but is finely cut to the extent that the contraction force does not act. FIG. 8 shows the latter example, in which the waist elastic member 25 and the curved elastic members 26 and 28 are crossed from the side seal portion 22 on one side across the interior body 10 and the side seal portion 22 on the other (opposite) side. Are continuously provided, and then a part or all of the portion crossing the interior body 10 is cut by a predetermined cutting pattern CP so as to be discontinuous. By making the elastic members 25, 26 and 28 discontinuous at the portion overlapping the interior body 10, shrinkage in the width direction of the interior body 10 (particularly the absorber 13) can be prevented. Of course, the waist elastic member 25 can also be disposed continuously across the interior body 10.

  The above-described exterior sheet 20 can be manufactured by, for example, techniques described in Japanese Patent Application Laid-Open No. 4-28363 and Japanese Patent Application Laid-Open No. 11-332913. Moreover, in order to cut | disconnect the curved elastic members 26 and 28 on the interior body 10, it describes in Unexamined-Japanese-Patent No. 2002-35029, Unexamined-Japanese-Patent No. 2002-178428, and Unexamined-Japanese-Patent No. 2002-273808. A cutting method is preferably employed.

(Positional relationship between waist elastic member and curved elastic member)
The longitudinal range having the waist elastic member 25 and the longitudinal range 31 having the curved elastic members 26 and 28 partially (or all) overlap, and the waist elastic member 25 is in the overlapping range 30. Are included (for example, about 5 to 10), and the mutual distance d1 of at least some of the waist elastic members 25 is preferably larger than the mutual distance d2 of the other waist elastic members 25. . Further, even outside the overlapping range 30, a plurality of waistline elastic members 25 are provided in an intermediate range 32 between the vertical range 31 having the curved elastic members 26 and 28 and the vertical range having the waist elastic member 24 ( For example, about 10 to 16 are preferably provided.

  In this manner, while allowing a certain overlap range 30 between the longitudinal range having the waist elastic member 25 and the longitudinal range having the curved elastic members 26 and 28, the mutual spacing of the waist elastic members 25 is within that range. By providing the wide portion, it is possible to suppress the denseness of the elastic member without impairing the fit. As a result, the pleats are not concentrated on the exterior sheet 20 in the overlapping range 30, an unnecessary increase in thickness, the elastic member itself and hardening due to its adhesion are suppressed, and a flexible and comfortable wearing feeling can be obtained. Become.

  In a normal case, the mutual distance d1 between the waist elastic members 25 is preferably about 10 to 50 mm, and the mutual distance d2 between the other waist elastic members 25 is preferably about 5 to 20 mm. Moreover, it is preferable that the longitudinal length of the overlapping range 30 is about 15 to 30% of the total length of the diaper in the unfolded state, and the ratio of the wide spacing portions 35 of the waist elastic members 25 in the overlapping range 30 Is preferably about 60 to 100% in the ratio of the length in the vertical direction (that is, the sum of the distances d1 / the vertical length of the overlapping range 30). If the overlapping range 30 is too narrow, the significance of widening the interval between the waist elastic members 25 is reduced. If it is too wide, the wide portion 35 of the waist elastic members 25 is increased, resulting in a decrease in fit. Further, if the proportion of the portion 35 having a wide interval between the waist elastic members 25 occupying the overlap range 30 is too small, improvement in flexibility can be expected, but remarkable improvement becomes difficult.

  Specifically, in the case of the illustrated example, the ratio of the wide portion 35 of the waist elastic member 25 occupying the overlapping range 30 with the wide interval d1 is about 40% for the front body F and 100% for the back body B. As described above, the configuration relating to the improvement in flexibility can be made different between the front body F and the back body B, and can be applied only to either the front body F or the back body B in the exterior sheet 20. (same as below).

(Fixing of elastic member)
On the other hand, the waist elastic member 24, the waist elastic member 25, the crack width elastic member 27, and the curved elastic members 26 and 28 are sandwiched between a pair of sheet layers 20A and 20B constituting the exterior sheet 20. The sheet layers 20 </ b> A and 20 </ b> B are bonded and fixed by a hot melt adhesive, and the adhesive application amount greatly affects the flexibility of the exterior sheet 20. Therefore, as shown in FIG. 7, the application portions G1 to G3 of the adhesive include the arrangement portion of the waist elastic member 24 and the vicinity thereof, the arrangement portion of the waist elastic member 25 and the vicinity thereof, and elasticity in the width direction of the crack portion. Areas where the member 27 is arranged and its vicinity, areas where the curved elastic members 26 and 28 are arranged, and their vertical and horizontal distances a (normally within ± 25 mm, more preferably within ± 10 mm, particularly preferably within ± 5 mm) It is preferable that no adhesive be applied between the two sheet layers other than these adhesives. In this way, by reducing the adhesive application portions G1 to G3 as much as possible, hardening by the adhesive can be suppressed in each stage. In addition, when this is combined with the increase in the local spacing of the waist elastic member 25 described above, a greater flexibility improvement effect than expected can be obtained.

  FIG. 7 shows application sites G1 to G3 of the hot melt adhesive in the manufacturing process, and the curved elastic members 26 and 28 show a state before cutting of a portion crossing the interior body 10 as indicated by a two-dot chain line. ing. An adhesive G1 for fixing the waist elastic member 24 and the waist elastic member 25 to the two sheet layers 20A and 20B, and an adhesive G2 for fixing the cracked part width direction elastic member 27 to the two sheet layers 20A and 20B are as follows. It is applied substantially only to the arrangement site of each elastic member 24, 25 and its vicinity. Such application of the adhesive can be realized by sandwiching the elastic members 24 and 25 having the adhesive applied to the outer peripheral surface between the two sheet layers 20A and 20B, and the outer peripheral surfaces of such elastic members 24 and 25. The adhesive can be applied to the nozzle using a Nordson Surelap nozzle or the like.

  On the other hand, the adhesive G3 for fixing the curved elastic members 26, 28 to the two sheet layers 20A, 20B has a rectangular adhesive application portion B2 arranged side by side along the bending direction of the curved elastic members 26, 28. As a result, the adhesive is applied only to the arrangement portions of the curved elastic members 26 and 28 and the regions within the predetermined distances a in the vertical and horizontal directions throughout the longitudinal direction of the curved elastic members 26 and 28. In the application process, in the normal form in which the lateral direction (diaper width direction) of the sheet layers 20A and 20B is along the line MD direction (flow direction) in the application process, the adhesive layer crosses the line CD direction (MD direction). In the direction), a plurality of slot coating nozzles are arranged in parallel, and the adhesive can be applied independently and intermittently from each nozzle. Further, unlike the illustrated example, a hot melt adhesive for fixing the curved elastic members 26 and 28 over the entire width direction in the longitudinal range having the curved elastic member can also be applied.

(Bent fit part)
As shown in detail in FIG. 13, the exterior sheet 20 includes an interior body fixing region 83 in which portions on both sides in the width direction of the crack facing portion of the exterior body 20 of the back body B are secured to the interior body 10, and the interior body A laterally extending portion 42 that extends laterally from the side edge of the body fixing region 83, and the dorsal curved elastic member 26 is located on the front side along the right leg opening edge 29 of the back body B It curves to the left side while facing to reach the crack facing part located in the center in the width direction of the back body B, folded back at the crack facing part, and further toward the left side toward the left side It is curved and fixed so as to reach the left side seal portions 21 and 22 of the back body B along the left leg opening edge 29 of the back body B.

  In addition, the elongated cracked portion width direction elastic member 27 extending in the width direction across the crack facing portion is fixed to the exterior sheet 20 in a state of being stretched at a predetermined elongation rate in the extending direction. Yes. Although the elongation rate at the time of fixation of the crack part width direction elastic member 27 can be determined suitably, it is preferable to set it as 180 to 300% in normal cases.

  The back-side curved elastic member 26 and the cracked portion width direction elastic member 27 are finely cut at a portion adjacent to the side of the crack-opposing portion to form a non-shrinkable portion 43 where no contractile force acts. The entire side from the non-shrinkable portion 43 is the non-existing portion 44 of the crack width elastic member 27.

  In the pants-type disposable diaper 1 configured in this way, in the longitudinal range having the cracked portion width direction elastic member 27, the dorsal curved elastic member 26 and the crack at a portion adjacent to the side of the crack facing portion. Since the width-direction elastic member 27 is finely cut to form a non-shrinkable portion 43 that does not substantially shrink, the crack opposing portion between them is a cracked portion as shown in FIGS. 10 and 11. The three-dimensional shape (the inner surface of the diaper is raised in a ridge shape) that fits into the wearer's crack by the contraction action of the width direction elastic member 27 becomes a bent fit portion 40, and the interior body 10 is formed at the non-contracted portions 43 on both sides in the width direction. It becomes a shape that fits the bottom without shrinking unnecessarily. And on the side, as can be seen from the comparison with FIGS. 10 and 13, since the contraction force in the width direction by the crack width-direction elastic member 27 does not act, the edge of the leg opening becomes hard and the wearing feeling is deteriorated. And the edges will not droop outward. Moreover, since the cracked portion width direction elastic member 27 is provided along the width direction, it can be manufactured not only at low cost but also stably by a high speed line.

  If the shrinkage in the width direction of the edge portion of the leg opening is only reduced, the cracked portion width direction elastic member 27 is provided over the entire width direction, while the non-shrinkable portion 43 is formed by cutting the cracked portion width direction elastic member 27. Just extending to the edge of the leg opening is not ineffective, but rather easy to manufacture. However, in order to pull up the crotch portion backward by the dorsal curved elastic member 26, it is preferable that the dorsal curved elastic member 26 continues through the edge of the leg opening to the inner body 10 fixing portion or the vicinity thereof. While adopting the form, if the non-shrinkable portion 43 by cutting the cracked portion width direction elastic member 27 is expanded to the edge of the leg opening, the dorsal curved elastic member 26 is also cut during manufacturing. This will result in a fall. On the other hand, when the dorsal curved elastic member 26 continues to the non-contracted portion 43 through the non-existing portion instead of the non-contracted portion 43 of the crack width-direction elastic member 27 as in the illustrated example, it is more effective. The crotch portion is pulled rearward by the dorsal curved elastic member 26, and the dorsal curved elastic member 26 is not cut during manufacture.

  Moreover, the application amount of the hot-melt adhesive for fixing the curved elastic members 26 and 28 and the cracked portion width direction elastic member 27 is determined by the existence portion 41 of the cracked portion width direction elastic member 27 and the cracked portion width direction elasticity. The non-existing portion 44 of the member 27 may be the same, but the non-existing portion 44 of the cracked portion width direction elastic member 27 is less than the existing portion 41 of the cracked portion width direction elastic member 27. The absence of the cracked portion width direction elastic member 27 does not reduce the strength, but rather allows the edge of the leg opening to be flexible. Further, as can be seen from the manufacturing method described later, after attaching the cracked portion width direction elastic member 27 over the entire width direction, only the region that becomes the non-stretchable portion of the cracked portion width direction elastic member 27 is cut finely. Thus, a portion of the cracked portion width direction elastic member 27 that is further to the side than the non-contracted portion 43 is drawn into a portion that is later excised by punching out the leg opening, and the cracked portion width direction elastic member 27 automatically. A non-existing portion 44 is formed. Note that a small amount of hot melt adhesive applied includes not applying at all. In addition, when the hot-melt adhesive for fixing the curved elastic members 26 and 28 and the hot-melt adhesive for fixing the cracked portion width direction elastic member 27 overlap, It means the total application amount, and when it does not overlap, it means the application amount of only the hot melt adhesive for fixing the crack width direction elastic member 27.

  Although the width of each part can be determined as appropriate, in the normal case, the width of the crack-opposing part is about 0.15 to 0.40 times the width 10X of the interior body 10, and the laterally extending portion 42 is of the interior body 10. The width 10X may be about 0.05 to 0.35 (one side only), and the non-shrinkable portion 43 may be about 0.25 to 0.40 times (one side only) the width 10X of the interior body 10.

  The contraction force acting portion (the central region in the width direction left without cutting the dorsal curved elastic member 26 and the cracked portion width direction elastic member 27) of the crack facing portion is a rectangular shape extending in the front-rear direction or toward the front side. The width may increase in shape (for example, an isosceles triangle shape whose base is located on the front side, or a trumpet shape whose isosceles side is a curve), but from the front end to the middle in the longitudinal direction If it has a shape in which the width increases toward the side, and further on the rear side, the width decreases toward the rear side, a bent fitting portion 40 that fits particularly well against a crack is formed. Therefore, it is preferable.

  Although the size of the contraction force acting portion of the crack facing portion can be determined as appropriate, the width is narrower than the interior body 10, for example, preferably about 0.15 to 0.40 times the width 10X of the interior body 10. The length in the front-rear direction is preferably about 1/5 to 1/2 of the length in the front-rear direction of the interior body 10. Moreover, it is preferable that the front end is located in the front-back direction center or its vicinity. The non-cut portion NC in the above-described cutting pattern has the same shape as the contraction force acting portion and has the same or slightly larger dimensions. The length and width of the groove 13D or slit provided in the absorber 13 described later may be shorter, longer, or the same as the contraction force acting part, but the width is less than the contraction force acting part. It is preferable to do this.

  (Interior body fixing area)

  As shown in FIGS. 3 and 5, the interior body 10 can be applied to the appropriate regions 81 to 84 on the back surface thereof and applied to the inner surface of the exterior sheet 20. Thus, from the viewpoint of improving the followability of the interior body 10 to the movement of the legs, the width of the fixing region 81 in the crotch portion is preferably narrowed, for example, about 30 to 45% of the width 10X of the interior body 10, It is preferable that the fixing regions 82 and 83 on both the front and rear sides of the crotch portion are widened to fix the interior body 10 firmly, and in particular, extend to the vicinity of both side edges.

  The fixed regions 81 to 84 having such a shape are applied with a plurality of rows of hot melt adhesives G arranged in the width direction, continuously in the front-rear direction for the intermediate portion, and intermittently for the both sides (applied in the crotch portion). Without), each can be formed by coating.

  However, when the width of the fixed region 81 in the crotch portion is narrowed, if the narrow region is excessively extended rearward, there are the following problems. That is, in order to pull up the crotch portion backward by the dorsal curved elastic member 26, a plurality of dorsal curved elastic members 26 and cracked portion width direction elastic members 27 are provided at intervals, and at least one dorsal curved portion is provided. It is preferable that the elastic member 26 is disposed so as to bulge to the front side of the cracked portion width direction elastic member 27 located on the most front side. However, in that case, a region 84 on the outer side in the width direction of the back-side curved elastic member 26 located on the foremost side of the exterior sheet 20 and on the front side of the cracked portion width-direction elastic member 27 located on the most front side is formed in the interior body 10. If it is not fixed, the edge of the leg opening in the region 84 is likely to bend outward. Therefore, in the present embodiment, the region 81 having a narrow adhesive width in the crotch portion is not excessively extended to the rear side, and the fixed region 83 having a wide rear portion is provided on the back side of the exterior sheet 20 so as to be curved. It extends to the region 84 on the outer side in the width direction of the member 26 and on the front side of the cracked portion width direction elastic member 27 located at the foremost side so as to fix the region 84 to the interior body 10 and prevent the dripping. It is configured.

(Balance of tensile stress during longitudinal elastic deformation)
Further, in order to improve the fit of the crack facing portion, the longitudinal contraction force in which the tensile stress in the longitudinal direction in the front body F is larger than the tensile stress in the longitudinal direction in the longitudinal direction in the back body B. A balance is preferred. In the illustrated example, in the front body F and the back body B, curved elastic members 26 and 28 are provided as pulling elastic members that exert a contraction force of a longitudinal component so as to lift the crotch portion toward the waist, and the front-rear contraction force is provided. Due to the balance, the tensile stress at the time of elastic deformation in the front body F is larger than the tensile stress at the time of elastic deformation in the rear body B. The tensile stress at the time of elastic deformation is the tensile test of the waist opening edge part of the body part to be measured and the crotch side end part of the opposite body part not to be measured, after peeling off both side seal parts 21 and 22 of the diaper and making them unfolded. It can be measured by holding each with a machine chuck and performing a tensile test. The difference in tensile stress at the time of elastic deformation can be determined appropriately, but the tensile stress at the time of elastic deformation in the longitudinal direction when the front body F is 80% elongated (when the elastic limit elongation (strain) is 100%) is It is preferably about 1.1 to 1.2 times that of the body B. As can be seen from this, the magnitude of the tensile stress at the time of elastic deformation is the same at the same elongation (when the elastic limit elongation is 100%, the elongation is preferably in the range of 65 to 95%). Means.

  When the pulling elastic members 26 and 28 are provided on the front body F and the back body B in this way, and the tensile stress at the time of elastic deformation in the longitudinal direction in the front body F is larger than that of the back body B, FIGS. As shown in FIG. 2, in the mounted state, the crotch part of the diaper is lifted while moving forward, by the contraction force of the pulling elastic member 28 of the front body F against the contraction force of the pulling elastic member 26 of the back body B. As a result, the front end portion of the bent fitting portion 40 is pulled forward, and as a result, the bent fitting portion 40 fits into the crack while maintaining its bent state. Therefore, while fitting well from a rupture to a crotch, the fit follows the movement of a body and is maintained elastically, and a crotch part becomes difficult to mokomoko at the time of mounting | wearing. On the other hand, in a conventional general pants-type disposable diaper, as shown in FIG. 12, as a result of the ruptured opposing part bulging and being largely separated from the skin, the crotch part is mokomoko, remarkably different from ordinary underwear Different discomfort occurs.

  In the illustrated example, the pulling elastic member is composed of only the curved elastic members 26 and 28. The curved elastic members 26 and 28 have a function of improving the fit to the buttock in the front body F and improving the fit to the bulge of the buttock in the rear body B. Of course, instead of or together with the curved elastic members 26 and 28, an elastic member such as an elongated shape or a sheet shape may be fixed in an elongated state along the longitudinal direction at the intermediate portion in the width direction, and may be used as a lifting elastic member (not shown). ). When the curved elastic members 26 and 28 are used in combination with other types of pulling elastic members, unlike the illustrated example, the curved elastic members 26 and 28 are provided only on one of the front body F and the back body B, and the other It is also possible to simply provide another pulling elastic member.

  In particular, when the curved elastic members 26 and 28 as shown in the illustrated example are provided, the longitudinal interval of the curved elastic members 26 in the back body B is the curve in the front body F at a portion outside the side edge of the interior body 10 in the width direction. When the elastic member 28 is arranged wider than the vertical interval, the curved elastic member 28 of the front body F exhibits a fitting property that enters the buttocks, and the curved elastic member 26 of the back body B bulges the buttocks. This is preferable because not only a fit property that can be wrapped is exhibited, but also when the bent fit portion 40 fits into a crack while maintaining its bent state, it is difficult to cause a situation of biting into the crack. .

  The aforementioned front-rear contraction force balance makes at least one of factors such as the thickness, elongation rate, number, etc. of the elastic members 26, 28 of the pulling elastic members 26, 28 different in the front-rear direction. Can be realized. When adjusting the thickness and the like of the pulling elastic members 26 and 28, the number of the pulling elastic members 26 and 28 is preferably determined according to the size and arrangement of the diaper. It is preferable that at least one of the thickness and the elongation rate is such that the front body F is thicker or higher than the back body B so that a balance of contraction force is obtained.

Specifically, in the illustrated example, it is preferable to define the specifications of each part within the following range. Although the unit of thickness of the elastic member is unified to dtex, it is not limited to synthetic rubber, and natural rubber can be used. The unit dtex when natural rubber is used is the synthesis of the dtex. This means the thickness of natural rubber having an SS curve equivalent to that of rubber (eg, 0.5 mm to 3.0 mm when natural rubber is used for the waist elastic member 24).
・ Exterior sheet 20
Material: Nonwoven fabric Basis weight: 15-45 g / m ² , especially 17-21 g / m ²
-Waist elastic member 24 of front body F and back body B
Thickness: 310 to 1,240 dtex, especially 940 to 1,240 dtex

Number: 5-10, especially 8-10 (each body)
Spacing: 0-5mm, especially 3-5mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
-Elastic member 25 around the waist of the front body F
Thickness: 310-1,240 dtex, especially 310-620 dtex
Number: 6 to 26, especially 8 to 20 Interval: 5 to 40 mm, especially 15 to 35 mm
Elongation rate when fixed: 180-350%, especially 250-300%
-Elastic member 25 of the waist part of the back body B
Thickness: 310-1,240 dtex, especially 310-620 dtex
Number: 6-24, especially 9-20 Interval: 5-40 mm, especially 15-35 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
-Rupture width direction elastic member 27
Thickness: 310-1,240 dtex, especially 470-620 dtex
Number: 5 to 20, especially 9 to 10 Spacing: 5 to 20 mm, especially 10 to 16 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 330%
-Curved elastic member 28 of front body F
Thickness: 310-1,240 dtex, especially 620-940 dtex
Number: 3-10, especially 5-10 Interval: 10-35 mm, especially 16-32 mm
Elongation rate at the time of fixation: 230 to 380%, particularly 250 to 300%, and higher elongation rate than the curved elastic member 26 of the back body B. The curved elastic member 26 of the back body B
Thickness: 310-1,240 dtex, especially 620-940 dtex
Number: 3-10, especially 5-10 Interval: 10-35 mm, especially 16-32 mm
Elongation rate when fixed: 200 to 350%, especially 250 to 300%
(Structural example of interior body)
As shown in FIGS. 4 to 6, the interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 made of a nonwoven fabric or the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like. The excretory fluid that has permeated through the top sheet 11 is absorbed and retained.

  As the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid permeable top sheet 11 is wound around the side edge of the absorber 13 and extends to the back side of the absorber 13.

  As the liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used. This water-impervious / breathable 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. is there.

  Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. In the example shown in the figure, a shape formed with a substantially rectangular planar shape is used, and the width dimension is a dimension width that does not give the wearer a feeling of goreness by hitting the crotch part. The absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer. The shape of the absorber 13 may be a rectangular shape as shown in the figure, or may be an hourglass shape (constricted shape) in which the width of the crotch portion is narrower than the back side and the abdominal side.

  In addition, the above-mentioned bending fitting part 40 can also assist the formation by providing a groove 13D or a slit along the longitudinal direction in the crack-opposing part of the absorbent body 13, and in that case, bending at an appropriate position as a fold. The fitting part 40 is formed and the shape thereof is easily maintained.

  It is preferable that solid gather BSs that fit around the legs are formed on both sides of the interior body 10. This three-dimensional gathered BS is formed by the gathered nonwoven fabric 15. As the gathered nonwoven fabric, as shown in FIGS. 5 and 6, a nonwoven fabric made into a double sheet by folding is preferably used. The side edge portion of the wound absorbent body 13 is further wound from the upper side thereof and extends to the back surface side of the absorbent body 13 to be bonded. More specifically, the gathered nonwoven fabric 15 has a three-dimensional gather BS forming portion left in the middle portion in the longitudinal direction of the diaper 1, and a range from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. Further, at the longitudinal front and rear end portions, the section from the width direction intermediate portion to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and a portion forming the three-dimensional gather BS is attached to the absorber 13 It is bonded with a hot melt adhesive or the like while being folded at the upper surface.

  Inside the gathered nonwoven fabric 15 formed of a double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 16 are disposed on the standing tip side portion. As shown by a two-dot chain line in FIG. 5, the thread-like elastic stretchable member 16 is for forming a three-dimensional gather BS by raising a non-woven fabric portion protruding from the absorber side edge portion by elastic stretch force.

  The liquid-impermeable back side sheet 12 enters the inside of the double sheet-like gathered nonwoven fabric 15 and constitutes a leak-proof wall on the lower end side of the three-dimensional gathered BS as shown in FIG. . As the liquid-impermeable back side sheet 12, it is desirable to use an opaque sheet so that brown such as defecation and urine does not appear. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.

  As the thread-like elastic elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, and the like that are usually used can be used. Moreover, in order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the elongation is 150 to 350%, and the interval is 7.0 mm or less. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

  In the same manner as the liquid-permeable surface sheet 11, the material fibers constituting the gathered nonwoven fabric 15 are olefin-based, polyester-based, amide-based synthetic fibers such as polyethylene or polypropylene, regenerated fibers such as rayon and cupra, and cotton. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, for the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.

(Front / rear presser sheet)
As shown in FIGS. 1 and 4, in order to cover the front and rear end portions of the interior body 10 attached on the inner surface of the exterior sheet 20 and to prevent leakage from the front and rear edges of the interior body 10, 50, 60 are provided. The illustrated embodiment will be described in more detail. The front presser sheet 50 extends over the entire width direction from the inner surface of the folded portion 20C of the waist side end portion to the position overlapping the front end portion of the interior body 10 in the inner surface of the front body F. The rear presser sheet 60 extends across the entire width direction from the inner surface of the folded portion 20C at the end on the waist side to the position overlapping the rear end of the interior body 10 in the inner surface of the back body B. If a slight non-adhesive portion is provided in the crotch side edges of the front and rear presser sheets 50, 60 over the entire width direction (or only the central portion), not only the adhesive does not stick out, but also this portion is removed from the surface sheet. It can be lifted slightly to function as a leak-proof wall.

  When the front and rear presser sheets 50 and 60 are attached as shown in the figure, there is an advantage that the degree of freedom of material selection is increased, but there are also disadvantages such as an increase in materials and manufacturing processes. Therefore, the folded portion 20C formed by folding the exterior sheet 20 on the inner surface of the diaper 1 can be extended to a portion overlapping the absorbent pad 200 to form a portion equivalent to the presser sheets 50 and 60 described above.

(Pants-type disposable diaper manufacturing method)
The pants-type disposable diaper 1 whose entire side from the non-shrinkable portion 43 is the non-existing portion 44 of the cracked portion width direction elastic member 27 is an exterior sheet assembling step, an elastic member cutting step, a leg opening cutting step, In a known manufacturing method including an interior body attaching process, a side seal, and an individualizing process, it can be manufactured by changing the amount of adhesive applied and using a specific elastic member cutting pattern as follows.

  That is, FIG. 14 shows the exterior sheet assembling process and the elastic member cutting process, and FIG. 15 shows the state change in the exterior sheet assembling process. In the exterior sheet assembling process, the continuous belt-shaped inner layer 20A is supplied on the upper side, and the continuous belt-shaped outer layer 20B is supplied on the lower side, and each elastic member (waist) is applied to the inner layer 20A and the outer layer 20B. The outer elastic member 24, the waist elastic member 25, the curved elastic members 26 and 28, and the cracked portion width direction elastic member 27), and the outer sheet 20 is continuously assembled by being pressure-bonded at the nip roller portion 50. . The waist elastic member 24, the waist elastic member 25, and the crack width elastic member 27 are linearly introduced along the transfer direction (MD direction), and a peripheral surface coating device 51 such as a comb gun or a sheathing nozzle. Thus, hot melt adhesives G1 and G2 are applied to the peripheral surface of the elastic member, and then supplied to the nip roller unit 50, and sandwiched and fixed between the inner layer 20A and the outer layer 20B. On the other hand, the curved elastic members 26 and 28 are introduced into the nip roller unit 50 while being swung in a transverse direction (CD direction) perpendicular to the transfer direction by a known traverse device 52. The traverse device 52 has guide passages for the curved elastic members 26 and 28 at the distal end portion, and swings the continuous web (sheets 20A and 20B) in the transverse direction at a predetermined speed. 28 is arranged in a predetermined curved shape. The hot-melt adhesive G3 for fixing the curved elastic member is spaced in the vertical direction in advance along at least one of the inner layer 20A and the outer layer 20B, in the illustrated example, the outer layer 20B. The curved elastic members 26 and 28 are fixed by a hot melt adhesive applied to the outer layer 20B in the nip roller portion 50.

  15 to 20 showing the state of each process, only the curved elastic members 26 and 28 and the cracked portion width direction elastic member 27 are shown, and the other elastic members are not shown.

  Characteristically, in the exterior sheet 20 assembling process, as shown in FIG. 15B, the application of the hot melt adhesive G2 to the cracked portion width direction elastic member 27 is changed at a predetermined interval and continuously supplied in the transfer direction. Of the cracked portion width direction elastic member 27 to be formed, the region A1 that becomes the non-existing portion 44 (edge portion of the leg opening) of the width direction elastic member described above and the portion LP that becomes the leg opening (later in the leg opening cutting step) The hot melt adhesive G2 is not applied to the portions arranged in the side region A2 (regions on both sides in the transfer direction) of the portion to be cut (is intermittently applied) or less than other portions (臀The crack width-direction elastic member 27 is released by the contraction force). Other than this, that is, in the region A3 that becomes the existence portion 41 of the cracked portion width direction elastic member 27 and the intermediate region A4 that is located between the side regions A2 of the portion LP that becomes the leg opening, the cracked portion width direction elastic member 27. Is applied to the inner layer 20A and the outer layer 20B in a coating amount so that the hot melt adhesive G2 is applied.

  Thereafter, as shown in FIG. 16, the continuous belt-like body 20 ′ to which the elastic members 24 to 28 are fixed has a region that becomes the above-described non-shrinkable portion 43 (a portion adjacent to the side of the crack facing portion). The elastic members 25 to 28 are finely cut by the predetermined cutting pattern CP included, and the contraction force is killed. More specifically, the continuous band-shaped body 20 ′ to which the elastic members 24 to 28 are fixed includes an embossing roll 54 in which convex portions for cutting are arranged on the peripheral surface in a predetermined cutting pattern CP, and the embossing roll 54. The elastic members 25 to 28 are cut by at least one of pressurization and heating between the convex portion of the embossing roll 54 and the opposing roll 55.

At this time, the crack width-direction elastic member 27 is not fixed by the hot-melt adhesives G2 and G3 in the region A1 serving as the non-existing portion 44 and the side region A2 of the portion LP serving as the leg opening. Or in the intermediate region A4 located between the side regions A2 of the portion LP that becomes the leg opening is firmly fixed by the hot melt adhesives G2 and G3, so that it is not fixed by cutting (or When the tension on the insufficiently fixed side is released, it moves relative to the inner layer 20A and the outer layer 20B due to the contraction, and is pulled toward the portion LP that becomes the leg opening. As a result, the non-existing portion 44 of the cracked portion width direction elastic member 27 is formed in the portion that becomes the edge of the leg opening. For such drawing-in, the width (length in the transfer direction) of the region serving as the non-existing portion 44 of the crack width-direction elastic member 27 is X ₁ , and the side region of the portion LP serving as the leg opening is used. When the width is X ₂ , and the elongation rate when fixing the cracked portion width direction elastic member 27 is T,
X ₁ ≧ 100 · X ₂ / (T-100)
It is desirable to configure so as to satisfy this relationship.

  On the other hand, as shown in FIG. 19 (a), the application of the hot melt adhesive G2 to the cracked portion width direction elastic member 27 is constant, and the entire cracked portion width direction elastic member 27 is covered with the inner layer 20A and When firmly fixed to the outer layer 20B, as shown in the state after the elastic member cutting step shown in FIG. 19B and the state after the leg opening cutting shown in FIG. However, the crack width direction elastic member 27 exists at the edge of the leg opening.

  Thereafter, according to a known manufacturing method, as shown in FIG. 17, a leg that cuts a portion LP that becomes a leg opening with a predetermined interval in the transfer direction with respect to the continuous belt-like body 20 ′ that becomes the exterior sheet 20. As shown in FIG. 18 (a), the inner body is pasted on the continuous belt-like body 20 ′ to be the outer sheet 20 with a predetermined interval in the transfer direction, as shown in FIG. As shown in the process and FIG. 18 (b), the continuous belt-like body to which the interior body 10 is attached is folded in two in the transverse direction orthogonal to the transfer direction, and the side seal portion 21 is spaced at a predetermined interval in the transfer direction. , 22 and the side-sealing / cutting process of cutting into individual diapers, the pants-type disposable diaper 1 can be manufactured. In addition, the cut end of the cracked portion width direction elastic member 27 drawn into the portion LP serving as the leg opening is discarded while being taken into the cut piece 20C cut in the leg opening cutting step.

  On the other hand, in the above manufacturing method example, only the cracked portion width direction elastic member 27 is drawn into the leg opening side, but the elongated shape extends in the width direction in the longitudinal range corresponding to the leg opening in the exterior sheet 20. If it is the elastic member in the width direction, even if it is provided at a site other than the cracked portion, it can be similarly drawn into the leg opening so as not to exist at the edge of the leg opening.

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

  DESCRIPTION OF SYMBOLS 1 ... Pants type disposable diaper, 10 ... Interior body, 11 ... Liquid-permeable surface sheet, 12 ... Liquid-impermeable back side sheet, 13 ... Absorber, 14 ... Packaging sheet, 15 ... Gathered nonwoven fabric, 16 ... Yarn-like elastic stretch 20 ... exterior sheet, 21, 22 ... side seal part, 24 ... waist elastic member, 25 ... waist elastic member, 26 ... dorsal curved elastic member, 27 ... cracked portion width direction elastic member, 28 ... belly Side curved elastic member, 26, 28 ... curved elastic member, 29 ... leg opening edge, 20C ... exterior sheet folded part, 81-84 ... interior body fixing region, 40 ... bent fitting part, 41 ... existing part, 42 ... side Extension part, 43 ... Non-shrink part, 44 ... Non-existing part, F ... Front body, B ... Rear body, 20A ... Inner layer, 20B ... Outer layer, LP ... Leg opening part.

Claims (5)

An exterior sheet that forms a front body and a back body, and an interior body including an absorbent body that is fixed to an inner surface of the exterior sheet, and both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body Are joined to form a side seal portion, thereby forming a waist opening and a pair of left and right leg openings,
The inner body fixing region fixed to the inner body, and the lateral extension of the inner body fixing region on both sides in the width direction of the crack facing part of the outer body sheet of the rear body extends laterally from the side edge of the inner body fixing region. In a pants-type disposable diaper having a protruding part,
It said elongated anal cleft width direction elastic member whole across the intergluteal cleft facing portion extends in the width direction is fixed to the outer sheet,
The crack facing portion can be expanded and contracted in the width direction together with the crack portion width direction elastic member,
Site adjacent to the side of the intergluteal cleft facing portion, the gluteal cleft width direction elastic member is finely cut, together with the contraction force is uncontracted portion that does not act, the overall lateral than the non-contracted parts The non-existing portion of the cracked portion width direction elastic member,
A pants-type disposable diaper characterized by that. The exterior sheet is formed by bonding an outer layer and an inner layer,
The cracked portion width direction elastic member is sandwiched between the outer layer and the inner layer and fixed to the outer layer and the inner layer by a hot melt adhesive,
The application amount of the hot melt adhesive for fixing the crack part width direction elastic member is larger in the non-existing part of the crack part width direction elastic member than the existing part of the crack part width direction elastic member. Few,
The pants-type disposable diaper according to claim 1. From the right side seal part of the back body to the front side along the right leg opening edge of the back body, it curves toward the left side and leads to the crack facing part located in the center in the width direction of the back body, Folded back at the crack-facing part, curved further toward the left side and toward the rear side, and led to the left side seal part of the back body along the left leg opening edge of the back body; A side-curved elastic member is fixed to the exterior sheet,
The portion having the dorsal curved elastic member in the exterior sheet can be expanded and contracted in the longitudinal direction of the dorsal curved elastic member together with the dorsal curved elastic member,
The back-side curved elastic member also has a portion finely cut at the non-shrinkable portion,
A plurality of the back-side curved elastic members and the cracked portion width direction elastic members are provided at intervals, and at least one back-side curved elastic member passes through the non-existing portion of the cracked portion width direction elastic member and The pants-type disposable diaper according to claim 1, wherein the pants-type disposable diaper is configured to be continuous up to a contracted portion. An exterior sheet that forms a front body and a back body, and an interior body including an absorbent body that is fixed to an inner surface of the exterior sheet, and both sides of the exterior sheet in the front body and both sides of the exterior sheet in the back body Are joined to form a side seal portion, thereby forming a waist opening and a pair of left and right leg openings,
In the longitudinal range corresponding to the leg opening, the side portions in the width direction of the exterior sheet overlap side portions that overlap the side portions of the interior body, and the lateral sides that extend laterally from the side edges of the interior body. And an edge portion of the leg opening is formed by a side edge of the lateral extension portion,
In the longitudinal range corresponding to the leg opening in the exterior sheet, an elongated widthwise elastic member extending in the width direction across a predetermined portion in the middle in the width direction is stretched at a predetermined elongation rate in the extending direction. It is fixed in the state,
The width direction elastic member is finely cut at a portion adjacent to the side of the predetermined portion to form a non-shrink portion where the contraction force does not act, and the entire side of the width direction elastic member is formed from the non-shrink portion. It is considered as a nonexistent part,
In the manufacturing method of pants-type disposable diapers,
The continuous strip-shaped outer layer and the continuous strip-shaped inner layer are bonded together while being transported along the continuous direction, and the width direction elastic member is sandwiched between the outer layer and the inner layer along the transport direction in the stretched state and the outer side. An exterior sheet assembling step for forming a continuous strip to be the exterior sheet by fixing with a hot melt adhesive to the inner layer and the inner layer;
In the continuous belt-like body to be the exterior sheet, a leg opening excision step of excising a portion to be the leg opening with a predetermined interval in the transfer direction;
In the exterior sheet assembling step, the application amount of the hot melt adhesive for fixing the width direction elastic member in the region that is the non-existing portion of the width direction elastic member and the side region of the portion that is the leg opening, Less than other areas,
After the outer sheet assembling step and before the leg opening excision step, by cutting the width direction elastic member finely in a region that becomes the non-shrinkable portion, The width direction elastic member located in the side region of the region to be the region and the leg opening is contracted and drawn into the portion to be the leg opening,
In the leg opening excision step, excising a portion to be a leg opening that has pulled in the width direction elastic member,
A method for producing a pants-type disposable diaper characterized by the above.   5. The pants-type disposable diaper according to claim 4, wherein the predetermined portion is a crack facing portion, and the width-direction elastic member is a crack-width elastic member extending in the width direction across the crack facing portion. Manufacturing method.