Patent Publication Number: US-2022211553-A1

Title: Composite stretchable member and wearable article using same

Description:
TECHNICAL FIELD 
     The present invention relates to a composite stretchable member stretchable in a specific direction and a wearing article using the same. 
     BACKGROUND ART 
     Wearing articles such as a disposable diaper having a waistline portion and a crotch portion have been known. In these wearing articles, the waistline portion of the wearing article may be formed of a composite stretchable member, which is stretchable, to improve wearing comfort. 
     As the composite stretchable member, for example, a member described in Patent Literature 1 is known. 
     The member described in Patent Literature 1 includes two sheets and a plurality of elastic members. These two sheets are bonded by a linear heat fusion line extending in a direction intersecting an extending direction of each elastic member. As a result, the sheets, or the sheets and the elastic members, are intermittently bonded to each other. 
     When a wearing article having a waistline portion as described above is manufactured, it is desired to improve design properties of the wearing article by giving various changes in shape to pleats generated when a waistline member contracts. However, a composite stretchable member as described above merely has a monotonous pattern when the composite stretchable member contracts, the monotonous pattern being formed by pleats that are each linearly formed along the heat fusion line, and thus improvement in design properties is difficult. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: International Publication WO 2016/208513 A 
     SUMMARY OF INVENTION 
     It is an object of the present invention to provide a composite stretchable member capable of improving design properties at the time of contraction, and a wearing article using the same. 
     To solve the problem, a composite stretchable member of the present invention is stretchable in a specific direction and includes two sheets facing each other, and a plurality of elastic members extending along the specific direction and being stretchable in the specific direction between the sheets, the sheets being bonded to each other at a plurality of first bonding sections, each of the first bonding sections continuously extending along an intersecting direction intersecting the specific direction to intersect the plurality of elastic members, each of the elastic members being bonded to each of the sheets at an intersection with the corresponding one of the first bonding sections, each of the first bonding sections having a wavy line shape extending in the intersecting direction with convex portions and concave portions that alternately appear continuously, and being disposed in a state where the convex portions and the concave portions are overlapped each other when viewed from the specific direction in at least a part of two adjacent first bonding sections. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a plan view of a composite stretchable member according to an embodiment of the present invention. 
         FIG. 2  is a part of a sectional view taken along line II-II in  FIG. 1 . 
         FIG. 3  is a schematic sectional view illustrating a section of an elastic member. 
         FIG. 4  is a view corresponding to  FIG. 1  and schematically illustrating a bonding section. 
         FIG. 5  is an enlarged view of a part of  FIG. 1 . 
         FIG. 6  is a schematic view illustrating a configuration of a manufacturing apparatus for manufacturing a composite stretchable member according to an embodiment of the present invention. 
         FIG. 7  is a plan view of the guide plate of  FIG. 6 . 
         FIG. 8  is a side view of the guide plate of  FIG. 7 . 
         FIG. 9  is an enlarged view of a guide groove of the guide plate of  FIG. 7 . 
         FIG. 10A  is an enlarged view of the guide plate and a peripheral portion thereof of the manufacturing apparatus of  FIG. 6 , and  FIG. 10B  is an enlarged view of a portion where an elastic member is fed from a guide groove of the guide plate of  FIG. 10A  to an anvil roll. 
         FIG. 11  is a view illustrating an outer peripheral surface of the anvil roll of  FIG. 6 . 
         FIG. 12  is a sectional view taken along line XII-XII in  FIG. 11 . 
         FIG. 13  is a developed view of a disposable diaper using a composite stretchable member. 
         FIG. 14  is an enlarged plan view illustrating a front abdomen portion of the disposable diaper of  FIG. 13 . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiments are merely examples embodying the present invention, and do not limit the technical scope of the present invention. 
     (1) Configuration of Composite Stretchable Member 
       FIG. 1  is a plan view of a composite stretchable member according to an embodiment of the present invention.  FIG. 2  is a part of a sectional view taken along line II-II in  FIG. 1 . 
     A composite stretchable member  1  includes two elongated sheets  2   a,    2   b  facing each other, and a plurality of elongated elastic members  10  stretchable in a longitudinal direction A that is a specific direction. Each of the elastic members  10  is disposed between the sheets  2   a,    2   b  so as to be stretchable in the longitudinal direction A (the left-right direction in  FIG. 1 ) of each of the sheets  2   a,    2   b,  so as to extend and contract in the longitudinal direction A of each of the sheets  2   a,    2   b  along the longitudinal direction A. In the present embodiment, the elastic members  10  are disposed at equal intervals in a width direction B (an intersecting direction orthogonal to the longitudinal direction A of the sheets  2   a,    2   b ) of the sheets  2   a,    2   b,  and extend parallel to the longitudinal direction A of the sheets  2   a,    2   b.    
     In the present embodiment, a sheet-like material such as a nonwoven fabric is used as the sheets  2   a,    2   b.    
     An elastic member  10  is made of a material that is more elastic than the material (nonwoven fabric or the like) of the sheets  2   a,    2   b.  In the present invention, the material of the elastic member  10  is not particularly limited. 
     As an example of the present embodiment is illustrated in  FIG. 3 , the elastic member  10  is a multi-strand provided with a plurality of rubber threads (fibrous elastic bodies)  10   a  collected in a bundle, and includes at least some of the rubber threads  10   a  each having the periphery covered with a covering layer  10   b,  for example. Specifically, the rubber threads  10   a  disposed particularly in an outer peripheral portion among the plurality of rubber threads  10   a  are each covered with the covering layer  10   b.  Every rubber thread  10   a  may be covered with the covering layer  10   b.    
     As the material of the rubber thread  10   a,  for example, polyurethane is used. As the material of the covering layer  10   b,  for example, a lubricant such as silicon oil or magnesium stearate is used. 
       FIG. 1  illustrates a plurality of first bonding sections  4  in a wavy line shape on which the sheets  2   a,    2   b  are bonded to each other, and the sheets  2   a,    2   b  are bonded to the elastic members  10 . 
       FIGS. 4 and 5  each schematically illustrate the bonding sections of  FIG. 1 . As illustrated in  FIGS. 1, 4, and 5 , the first bonding sections  4  are disposed at equal intervals in the longitudinal direction A of the sheets  2   a,    2   b,  and continuously extend parallel to each other in the width direction B of the sheets  2   a,    2   b.    
     Each first bonding section  4  intersects all the elastic members  10  at positions of respective intersections  4   a  and extends along a line intersecting an extending direction (i.e., the longitudinal direction A) of the elastic members  10 . Specifically, each first bonding section  4  extends between opposite outer portions of the sheets  2   a,    2   b  in the width direction B across a region where the elastic members  10  are disposed. 
     At an intersection  4   a  where each of the elastic members  10  intersect the corresponding on one of the first bonding sections  4 , each of the elastic members  10  and each of the sheets  2   a,    2   b  are bonded to each other. 
     As illustrated in  FIG. 1 , each of the first bonding sections  4  has a wavy line shape extending in the width direction B while being periodically displaced in the longitudinal direction A with a convex portion  4   b  and a concave portion  4   c  that alternately appear continuously. Two adjacent first bonding sections  4  are disposed with convex portions  4   b  or concave portions  4   c  that at least partially overlap each other, and specifically are disposed with the convex portions  4   b  or the concave portions  4   c  that at least partially coincide in shape with each other. This enables a pleat in a wavy line shape to be conned along each of the first bonding sections  5  in a wavy line shape when the composite stretchable member  1  contracts. As a result, the composite stretchable member  1  has a plurality of pleats in a wavy line shape, thereby improving design properties of the composite stretchable member  1 . 
     Specifically, two adjacent first bonding sections  4  illustrated in  FIG. 1  are disposed with both the bonding sections  4  coinciding in phase with each other in the width, direction B in at least one region. For example, wavy lines in two adjacent first bonding sections  4  may be disposed side by side in the same phase over the entire length as illustrated in  FIG. 1 , but may be disposed side by side in the same phase only in some sections and in different phases in other sections. 
     Additionally, a first bonding section  4  in a wavy line shape may have a wavelength that is constant over the entire length as illustrated in  FIG. 1  or the wavelength may change depending on a position in the first bonding section  4  in the width direction B. 
     Furthermore, the first bonding section  4  in a wavy line shape may have an amplitude that is constant over the entire length as illustrated in  FIG. 1 , or the amplitude may change depending on a position in the first bonding section  4  in the width direction B. 
     As described above, when at least one of the phase, the wavelength, and the amplitude is appropriately changed and set in a part or the whole of the plurality of first bonding sections  5  in a wavy line shape, a plurality of pleats in a wavy line shape formed when composite stretchable member  1  contracts can be partially or entirely changed in shape. As a result, the composite stretchable member  1  having a varied pattern can be formed. 
     When viewed from the width direction B, for example, when viewed from the arrow B 1  in  FIG. 1 , the plurality of first bonding sections  4  is disposed at intervals that are set to have a space between two adjacent first bonding sections  4 , being closed by the convex portion  4   b  of at least one of the two first bonding sections  4 . 
     In the first bonding section  4 , the sheets  2   a,    2   b  as well as the sheets  2   a,    2   b  and the elastic member  10  are bonded to each other by welding. In the present embodiment, these are ultrasonically welded. 
     The sheets  2   a,    2   b  are bonded to each other by being partially melted and welded. In contrast, the elastic member  10  and the sheets  2   a,    2   b  are welded to each other when the sheets  2   a ,  2   b  are partially melted and the covering layer  10   b  of the elastic member  10  is melted. 
     Specifically, in the present embodiment, a rubber thread having a melting point of about 200° C. is used as the rubber thread  10   a  contained in the elastic member  10 , and the covering layer  10   b  is made of magnesium stearate (melting point: about 120° C.) having a lower melting point than the rubber thread. When the elastic member  10  and the sheets  2   a,    2   b  are welded to each other, the covering layer  10   b  is melted to weld the covering layer  10   b  to the sheets  2   a,    2   b  without melting of the rubber thread  10   a.    
     (2) Manufacturing Apparatus for a Composite Stretchable Member 
     Next, a manufacturing apparatus for manufacturing the composite stretchable member  1  will be described. 
       FIG. 6  is a schematic view of a manufacturing apparatus  100  according to an embodiment of the present invention. 
     The manufacturing apparatus  100  includes: a bonding device  200  that ultrasonically welds and bonds the elastic member  10  to the sheets  2   a,    2   b,  and the sheets  2   a,    2   b  to each other while the elastic member  10  is sandwiched between the sheets  2   a,    2   b;  a first guide roller  102  that guides the lower sheet  2   b  to the bonding device  200  (specifically, an anvil roll  210  described later); an elastic member guide device (guide device)  110  that supplies the elastic member  10  to the bonding device  200 ; a nip roll (second guide roller)  104  that guides the upper sheet  2   a  to the bonding device  200  and presses the two sheets  2   a,    2   b,  and the elastic member  10 ; and a third guide roller  106  that guides a bonded sheet or the like, i.e., the composite stretchable member  1 . 
     The bonding device  200  includes the anvil roll (conveying roller)  210  and a horn (compressing device)  220 . 
     The anvil roll  210  is a rotating member that rotates about an axis extending in a direction orthogonal to the paper surface of  FIG. 6 . Hereinafter, the direction orthogonal to the paper surface of  FIG. 6  is referred to as a “front-back direction”. The anvil roll  210  is rotatably attached to a rotation shaft, as a rotation center, extending horizontally (in the front-back direction) with respect to a vertical wall portion of an apparatus, such as a panel (not illustrated). The anvil roll  210  rotates to convey the elastic member  10  guided by the elastic member guide device  110  while the elastic member  10  is sandwiched between the sheets  2   a,    2   b  guided by the rollers  102  and  104 , respectively, on the outer peripheral surface of the anvil roll  210 . In the example illustrated in  FIG. 6 , the anvil roll  210  rotates counterclockwise in  FIG. 6 . Hereinafter, the sheets  2   a,    2   b  sandwiching the elastic member  10  is referred to as pre-bonding sheets. 
     As illustrated in  FIG. 11 , the outer peripheral surface of the anvil roll  210  is provided with a protrusion  212  protruding radially outward. The protrusion  212  is provided on the outer peripheral surface of the anvil roll  210  over the entire width in its rotation axis direction C. The protrusion  212  has a wavy line shape corresponding to the first bonding section  4  of the composite stretchable member  1 . 
     That is, a plurality of protrusions  212  in a wavy line shape extends along the rotation axis direction C of the anvil roll  210 , and the protrusions  212  are disposed parallel to each other and at equal intervals in a circumferential direction D. 
     The plurality of protrusions  212  in a wavy line shape is disposed at intervals, corresponding to the shape of the plurality of first bonding sections  4  of the composite stretchable member  1  described above. The intervals are set such that when viewed from the rotation axis direction C of the anvil roll  210 , e.g., when viewed from the arrow C 1  in  FIG. 11 , a space between two adjacent protrusions  212  is closed by a convex portion  212   a  (a convex portion protruding in the circumferential direction D) of at least one of the two adjacent protrusions  212 , the convex portion  212   a  corresponding to the convex portion  4   b  of the first bonding section  4 . Thus, causing an output unit  221 , which is described later, of a horn  220  to face the plurality of protrusions  212  in a wavy line shape of the anvil roll  210  enables the sheets  2   a,    2   b  to be reliably sandwiched between the output unit  221  and the protrusions  212  during ultrasonic welding. As a result, when the plurality of first bonding sections  4  of the composite stretchable member  1  of  FIG. 1  is formed by ultrasonic welding, fluctuations in pressure when the two sheets  2   a,    2   b  are sandwiched between the output unit  221  of the horn  220  and the protrusions  212  in a wavy line shape of the anvil roll  210  (see  FIG. 12 ) can be reduced at any position in the composite stretchable member  1  in the width direction B (i.e., the rotation axis direction C of the anvil roll  210 ). 
     As illustrated in  FIGS. 11 and 12 , a plurality of grooves  214  recessed radially inward of the anvil roll  210  is formed in each protrusion  212  in a wavy line shape. The plurality of grooves  214  is disposed at equal intervals in the rotation axis direction C each protrusion  212 . The grooves  214  of each of adjacent protrusions  212  are disposed side by side at equal intervals in the circumferential direction D of the anvil roll  210 . 
     Into each of the grooves  214 , a portion of the lower sheet  2   b  (a sheet disposed close to the anvil roll  210 ) with the elastic member  10  disposed is inserted. Thus, placement of the elastic members  10  for the first bonding section  4  coincides with placement of the grooves  214  for the protrusion  212 . 
     The sheet  2   b  is conveyed by the anvil roll  210  while having a portion where the elastic member  10  is disposed, the portion being inserted into the corresponding one of the grooves  214 . As described above, in the present embodiment, the elastic members  10  are guided into the corresponding grooves  214  by a guide plate  112  provided with guide grooves  114   b  (see  FIG. 7 ) at positions corresponding to the respective grooves  214 , so that the elastic members  10  are each stably disposed at an appropriate position on the sheet  2   b.    
     In the present embodiment, the sheet  2   b  together with the elastic members  10  that are partially inserted into the corresponding grooves  214  are conveyed by the anvil roll  210 . Only the sheet  2   b  with portions inserted into the grooves may be conveyed. 
     The grooves  214  are formed in the protrusion  212  at portions where the respective elastic members  10  are disposed as described above, so that at least a part of each of the elastic members  10  disposed on a pre-bonding sheet is retracted in the corresponding grooves when the pre-bonding sheet is compressed during bonding. Thus, an elastic member  10  is prevented from being cut when being compressed. 
     However, when the groove  214  has an excessive sectional area, the elastic member  10  may be less likely to be appropriately bonded to the sheets  2   a,    2   b.  Thus, in the present embodiment, as illustrated in  FIG. 12 , when the elastic member  10  with a natural length is disposed in the groove  214 , a part of the elastic member  10  protrudes outward from the groove  214 , and the rest of the elastic member  10  is accommodated in the groove  214 . Specifically, the groove  214  is configured to have a section taken along a plane substantially orthogonal to the circumferential direction (conveying direction) of the anvil roll  210 , the section having a shape in which when the elastic member  10  is disposed in the groove  214  with the natural length, a part of the elastic member  10  protrudes outward in the radial direction of the anvil roll  210  front a linear imaginary line L 10  connecting open ends (Q 1 , Q 2 ) of the groove  214 . The groove  214  is also configured to have the sectional shape in which when the elastic member  10  is extended from a natural state (e.g., when being elongated 300%) is disposed in the groove  214 , a part of the elastic member  10  protrudes outward in the radial direction of the anvil roll  210  from the linear imaginary line L 10  connecting the open ends (Q 1 , Q 2 ) of the groove  214 . The groove  214  described above preferably has a sectional shape of a substantially V-shape as illustrated in  FIG. 12 . The groove  214  described above preferably has a sectional area S 1  smaller than a sectional area of the elastic member  10  to be disposed. 
     The horn  220  illustrated in  FIGS. 6 and 10A  is a device that applies ultrasonic vibration to a pre-bonding sheet conveyed by the anvil roll  210  while compressing (pressurizing while sandwiching) the pre-bonding sheet with the outer peripheral surface of the anvil roll  210 . The horn  220  is disposed to face the outer peripheral surface of the anvil roll  210 . In the example of  FIG. 6 , the horn  220  is disposed to face an upper portion of the outer peripheral surface of the anvil roll  210 . The horn  220  is provided at its leading end with an output unit  221  that applies ultrasonic vibration toward the outer peripheral surface of the anvil roll  210 . 
     The horn  220  applies ultrasonic vibration to a pre-bonding sheet with the output unit  221  pressing against the pre-bonding sheet and compressing the pre-bonding sheet together with the anvil roll  210 . This causes the sheets  2   a,    2   b  to be melted and welded to each other. The elastic member  10  is also melted, so that the elastic member  10  and the sheets  2   a,    2   b  are welded to each other. Specifically, the output unit  221  compresses the pre-bonding sheet together with the protrusion  212 , and bonds the sheets  2   a,    2   b  to each other and bonds the elastic member  10  to the sheets  2   a,    2   b  in a portion of the pre-bonding sheet disposed on the protrusion  212 . The leading end of the output unit  221  has a planar shape (See  FIG. 12 ). 
     As described above, in the present embodiment, the covering layer  10   b  is made of magnesium stearate having a lower melting point than the rubber thread  10   a.  Thus, during welding between the elastic member  10  and the sheets  2   a,    2   b,  the covering layer  10   b  is melted to weld the covering layer  10   b  to the sheets  2   a,    2   b  without melting of the rubber thread  10   a.    
     The output unit  221  at the leading end of the horn  220  extends in the front-back direction (the rotation axis direction C of the anvil roll  210 ), and the horn  220  applies ultrasonic vibration to the outer peripheral surface of the anvil roll  210  throughout in the rotation axis direction C of the anvil roll  210 . While a pre-bonding sheet is conveyed by the anvil roll  210 , the horn  220  always applies ultrasonic vibration. Thus, as the pre-bonding sheet is conveyed by the anvil roll  210 , the pre-bonding sheet is continuously bonded. 
     As illustrated its  FIG. 6 , in the present embodiment, the lower sheet  2   b  is guided by the first guide roller  102  to a position separated upstream in the conveying direction (the right side in  FIG. 6 ) from the horn  220  on the outer peripheral surface of the anvil roll  210 . The sheet  2   b  is conveyed toward the horn  220  along the outer peripheral surface of the anvil roll  210  along with rotation of the anvil roll  210 . 
     The upper sheet  2   a  is introduced into a portion of the outer peripheral surface of the anvil roll  210 , being near the horn  220  and upstream of the horn  220  in the conveying direction (the right side in  FIG. 6 ), by the nip roll  104 . 
     The elastic member  10  is introduced onto the outer peripheral surface of the anvil roll  210  at a position between a position where the sheet  2   b  is introduced onto the anvil roll  210  and a position where the sheet  2   a  is introduced onto the anvil roll  210  by the elastic member guide device  110 . As a result, the elastic member  10  is conveyed to a position facing the horn  220  while being sandwiched between the sheets  2   a,    2   b.    
     Although the sheet  2   a  may be introduced onto the anvil roll  210  from the nip roll  104  at any position between a position where the elastic member  10  is introduced and a position facing the horn  220 , the position is preferably on a side close to the position facing the horn  220 , and more preferably near the position facing the horn  220 . In the present embodiment, as illustrated in  FIGS. 6 and 10A , the nip roll  104  is disposed at a position closest upstream in the conveying direction (the right side in  FIGS. 6 and 10A ) of the horn  220  in the conveying direction of the sheets  2   a,    2   b,  i.e., the rotation direction of the anvil roll  210  (counterclockwise direction in  FIG. 10A ). This configuration enables preventing the elastic member  10  introduced onto the outer peripheral surface, of the anvil roll  210  from being covered with the sheet  2   a  at an early stage and from causing positional deviation. 
     The elastic members  10  are introduced onto the outer peripheral surface of the anvil roll  210  while being arranged parallel to each other in the front-back direction, and are placed on the sheet  2 , which is previously introduced onto the outer peripheral surface of the anvil roll  210 , parallel to each other in the width direction B, on the outer peripheral surface of the anvil roll  210 . The elastic members  10  are each introduced onto the anvil roll  210  while being elongated in the circumferential direction D of the anvil roll  210 . In the present embodiment, the elastic members  10  are each introduced onto the anvil roll  210  while being elongated 300% of the natural state when the natural state is set to 100%. 
     As illustrated in  FIGS. 6, 10A, and 10B , the elastic member guide device  110  includes a plurality of guide rollers  111  and a guide plate  112  in a plate-like shape as a guide member. 
     Each of the guide rollers  111  is a rotary member rotatable about its axis extending in the front-back direction, and guides the elastic member  10  toward the anvil roll  210  while the elastic member  10  is elongated (e.g., elongated 300%). 
     As illustrated in  FIGS. 6 to 10A and 10B , the guide plate  112  is a tabular member that guides the elastic members  10  to the corresponding grooves  214  (see  FIGS. 11 and 12 ) formed on the outer peripheral surface of the anvil roll  210  while the elastic members  10  are separated from each other in the front-back direction, i.e., in a direction parallel to the axis of the anvil roll  210 . 
     The guide plate  112  has a leading end  114   a,  which is an edge closest to the outer peripheral surface of the anvil roll  210 , and a proximal end disposed farther away from the anvil roll  210  than the leading end  114   a.  The guide plate  112  is disposed to extend not only in a direction of coming into contact with and separating from the anvil roll  210  but also in the front-back direction. In the present embodiment, to prevent the guide plate  112  from interfering with the sheets  2   a,    2   b,  the guide plate  112  has a thickness t (dimension in a vertical direction illustrated in  FIG. 8 ) that is set to be small, and has a thin plate shape. 
     The leading end  114   a  of the guide plate  112  has a tapered shape. Specifically, as illustrated in  FIG. 8 , the guide plate  112  is provided in its leading end portion (portion close to the anvil roll  210 ) with an inclined surface  114   c  that is inclined toward the leading end  114   a  to approach a bottom surface  114   d  of the guide plate  112 . The inclined surface  114   c  and the bottom surface  114   d  form the leading end  114   a  tapered. In the present embodiment, the inclined surface  114   c  and the bottom surface  114   d  form an angle θ 2  that is set to be a small angle. 
     As illustrated in  FIGS. 10A and 10B , the leading end  114   a  of the guide plate  112  is disposed upstream in the conveying direction (right side in  FIGS. 10A and 10B ) of a contact point P 2  at which the guide plate  112  is in contact with the elastic member  10  on the outer peripheral surface of the anvil roll  210  in the rotation direction (counterclockwise direction in  FIGS. 10A and 10B ) of the anvil roll  210  while facing upstream in the conveying direction. 
     The leading end  114   a  tapered of the guide plate  112  is provided with a plurality of guide grooves  114   b.  Specifically, the guide grooves  114   b  are formed at respective positions away from each other at equal intervals in the front-back direction (direction parallel to the axis of the anvil roll  210 ) at the leading end  114   a  of the guide plate  112 , and individually hold the respective elastic members  10  to guide the elastic members  10  into the respective grooves  214  of the anvil roll  210 . As illustrated in  FIG. 9  that illustrates a part of the guide grooves  114   b  in  FIG. 7  in an enlarged manner, each of the guide grooves  114   b  is recessed from the leading end  114   a  of the inclined surface  114   c  toward the proximal end, and has a V-shape having an opening angle of about 90 degrees. These guide grooves  114   b  reliably position and hold the respective elastic members  10  to guide the elastic members  10  onto the outer peripheral surface of the anvil roll  210  while separating the elastic members  10  from each other in the front-back direction. The guide grooves  114   b  face the respective grooves  214  formed in the anvil roll  210  and are provided at the same intervals as the grooves  214  to guide the elastic members  10  into the respective grooves  214 . 
     The leading end  114   a  of the guide plate  112  and the guide grooves  114   b  formed at the leading end  114   a  face in an opposite direction (i.e., a clockwise direction) to the rotation direction of the anvil roll  210  (the counterclockwise direction in  FIGS. 6 and 10A ). Thus, the elastic members  10  engaged into the respective guide grooves  114   b  are pulled by the anvil roll  210  rotating in the counterclockwise direction, and are bent at bottoms P 1  of the respective guide groove  114   b . Each of the elastic members  10  then extends in a tangential direction of the contact P 2  on the outer peripheral surface of the anvil roll  210 , and is inserted into the corresponding one of the grooves  214  (see  FIGS. 11 and 12 ) at the contact P 2  on the outer peripheral surface of the anvil roll  210 . 
     As illustrated in  FIGS. 10A and 10B , as a length L 1  (specifically, a distance L 1  from the bottom P 1  of a guide groove  114   b  to the contact point P 2  at which an elastic member  10  is in contact with the anvil roll  210 ) of the elastic member  10  positioned between the guide groove  114   b  and a groove  214  of the anvil roll  210  decreases in the guide plate  112 , a defect in which the elastic member  10 , such as a rubber thread, is detached from the groove  214  of the anvil roll  210  is reduced. 
     As illustrated in  FIG. 10B , the guide plate  112  is disposed with a gap δ 1  between the bottom P 1  of the guide groove  114   b  and the outer peripheral surface of the protrusion  212  of the anvil roll  210 , the gap δ 1  being as small as possible. This enables the length L 1  of the elastic member  10  to be further shortened, so that the defect in which the elastic member  10  is detached from the groove.  214  of the anvil roll  210  is further reduced. 
     As illustrated in  FIG. 10B , the guide plate  112  is disposed with the bottom surface  114   d  facing the anvil roll  210  that forms an acute angle θ 1  (90 degrees or less) with respect to a tangent line of the anvil roll  210  at the contact point P 2  where the anvil roll  210  and the elastic member  10  are in contact with each other. This enables further shortening a length L 1  of the elastic member  10 , and further reducing the defect in which the elastic member  10  is detached from the groove  214  of the anvil roll  210 . 
     As illustrated in  FIGS. 6 and 10A , the plurality of guide rollers  111  are disposed upstream in the conveying direction of the guide plate  112  in the conveying direction of the elastic member  10  to guide the elastic member  10  into the guide groove  114   b.  Each of the guide rollers  111  is provided in its outer peripheral surface with grooves (not illustrated) away from each other in an extending direction of a rotation shaft of the guide roller  111  to guide the elastic members  10  into the respective guide grooves  114   b.    
     As illustrated in  FIG. 10A , a guide roller  111 A positioned most downstream of the plurality of guide rollers  111  is disposed to be able to ensure some distance L 2  in which the elastic member  10  is separated from the guide roll from the guide roller  111  and inserted into the guide groove  114   b  to prevent influence due to rotation unevenness and rattling of the guide roller  111 A (e.g., slack of the elastic member  10  and the like). This configuration enables eliminating influence on the elastic member  10  due to rotation unevenness and rattling of the guide roller  111 , such as a slack of the elastic member  10 . 
     As illustrated in  FIGS. 6 and 10A , the nip roll  104  is disposed upstream in the conveying direction of the horn  220 . The nip roll  104  can sandwich two sheets and the elastic member  10  in cooperation with the anvil roll  210  in a region where the elastic member  10  is inserted into the groove  214  of the anvil roll  210 , i.e., a section from a first position a contact point between the anvil roll  210  and the elastic member  10 ) P 2  (see  FIG. 10B ) where the elastic member  10  is inserted into the groove  214  in the outer peripheral surface of the anvil roll  210  to the output unit  221  (see  FIG. 10A ) of the horn  220 . 
     (3) Wearing Article and Method for Manufacturing the Same 
       FIGS. 13 and 14  are each a schematic view illustrating a disposable diaper (wearing article)  30  using the composite stretchable member  1  as a usage example of the composite stretchable member  1  configured as described above. 
       FIGS. 13 and 14  each illustrate a disposable diaper  30  that has an underpants-type form, and that mainly includes a waistline portion  31  formed of the composite stretchable member  1  having elasticity, a crotch portion  34 , and an absorbent body  37  capable of absorbing liquid such as moisture. 
     The composite stretchable member  1  of the present embodiment is disposed in the waistline portion  31  with the longitudinal direction A of the composite stretchable member  1  aligning with a waistline direction X of the waistline portion  31 . In other words, the composite stretchable member  1  is applied to a front abdomen portion  32  and a rear back portion  33  such that the extending direction of the composite stretchable member  1  (longitudinal direction A of the composite stretchable member  1 ) aligns with the waistline direction X (left-right direction in  FIG. 13 ) at the time of wearing. That is, the waistline portion  31  includes the front abdomen portion  32  and the rear back portion  33 , and is formed in an annular shape by joining the front abdomen portion  32  to the rear back portion  33  with a pair of joining regions  39 . 
       FIG. 13  illustrates an unfolded state in which the disposable diaper  30  includes the front abdomen portion  32  constituting a front body of the waistline portion  31 , the rear back portion  33  constituting a back body of the waistline portion  31 , the crotch portion  34  constituting a crotch portion, and the absorbent body  37 . The crotch portion  34  joins the front abdomen portion  32  to the rear back portion  33 . The absorbent body  37  is disposed across the front abdomen portion  32 , the crotch portion  34 , and the rear back portion  33 . Specifically, the absorbent body  37  is fixed to the front abdomen portion  32  and the rear back portion  33  while partially overlapping the front abdomen portion  32  and the rear back portion  33  formed of the composite stretchable member  1  to form overlapped portions S. 
     A folded portion  38  folded at a folding line  36  is continuously provided at an upper end of the front abdomen portion  32  and at a lower end of the rear back portion  33 . The crotch portion  34  is provided with leg holes  35  that are each a substantially semicircular hole into which a leg can be inserted. 
     The front abdomen portion  32  includes stretchable regions  32   a  on both left and right sides, having elasticity that allow stretching in the waistline direction X, and a weakened region  32   b  in a central portion in which elasticity is weakened, the stretchable regions  32   a  on both the left and right sides and the weakened region  32   b  in the central portion being continuously formed. As with the front abdomen portion  32 , the rear back portion  33  also includes stretchable regions  33   a  on both left and right sides, having elasticity that allow stretching in the waistline direction X, and a weakened region  33   b  in a central portion in which elasticity is weakened, the stretchable regions  33   a  on both the left and right sides and the weakened region  33   b  in the central portion being continuously formed. The weakened region  32   b  at the front and the weakened region  33   b  at the rear may be formed at least in the overlapped portions S of the absorbent body  37  and the front abdomen portion  32 , and of the absorbent body  37  and the rear back portion  33 , respectively, and may be formed in a range wider than each of the overlapped portions S as illustrated in  FIGS. 13 and 14 . The weakened regions  32   b  and  33   b  formed wider than the overlapped portions S enable an attachment error of the absorbent body  37  to be absorbed. 
     The composite stretchable member  1  is formed by sandwiching the elastic members  10  between front and back surfaces of the corresponding sheets  2   a,    2   b  paired and ultrasonically welding the elastic members  10  and the sheets  2   a,    2   b  to each other in the entire range (i.e., a range of the entire stretchable regions  32   a,    33   a  and weakened regions  32   b,    33   b ) of the front abdomen portion  32  and the rear back portion  33  in  FIG. 13 . That is, as illustrated in  FIG. 14 , while the elastic members  10  being extended in the waistline direction X (longitudinal direction A) are sandwiched between the sheets  2   a,    2   b  paired, the elastic members  10  and the sheets  2   a,    2   b  paired are ultrasonically welded to each other at the first bonding sections  4  in a wavy line shape, being separated from each other in the waistline direction X (longitudinal direction A). 
     The composite stretchable member  1  in  FIGS. 13 and 14  includes portions other than the front abdomen portion  32  and the rear back portion  33 , such as the crotch portion  34  and the folded portion  38  that are formed of the sheet  2   a  of the sheets  2   a,    2   b  paired (a sheet body constituting an outer side of the disposable diaper  30  in the form of a disposable diaper). 
     Like the weakened region  32   b  of the front abdomen portion  32  illustrated in  FIG. 14 , each of the elastic members  10  in the present embodiment is cut to form the weakened region  32   b  in which the elasticity of the elastic members  10  is weakened in a range including the overlapped portion S where the absorbent body  37  overlapped with the composite stretchable member  1 . Although each elastic member  10  may be cut at one place at least, each elastic member  10  is cut at a plurality of places at equal intervals in the longitudinal direction A, for example. 
     The weakened region  32   b  includes a first bonding section  4  in a wavy line shape that is formed of a dotted-line bonding section  40  including a plurality of points without intersecting the elastic member  10 , being scattered in the wavy line shape. The dotted-line bonding section  40  bonds the two sheets  2   a,    2   b  to each other by ultrasonic welding or the like, but does not bond the sheets  2   a,    2   b  to the elastic member  10 . Thus, the first bonding section  4  formed of the dotted-line bonding section  40  is disposed without forming the intersection  4   a  with the elastic member  10 , and the elastic member  10  is disconnected by cutting, in a range of the weakened region  32   b  including the overlapped portion S overlapping the absorbent body  37  in the composite stretchable member  1 . 
     The disposable diaper  30  illustrated in  FIGS. 13 and 14  includes the front abdomen portion  32  and the rear back portion  33  that are each provided at its opposite ends in the waistline direction X with the respective joining regions  39  to join the opposite ends of the front abdomen portion  32  to the opposite ends of the rear back portion  33 . Each joining region  39  extends linearly in the width direction B. 
     The joining region  39  includes at least partially a non-formation region where the intersection  4   a  (see  FIG. 1 ) of the first bonding section  4  and the elastic member  10  is not formed. Thus, the joining region  39  in the disposable diaper  30  has no elasticity. The joining regions  39  of the front abdomen portion  32  and those of the rear back portion  33  are bonded to each other by ultrasonic welding or the like. Then, the elastic member  10  may be bonded to the sheets  2   a,    2   b , but may not necessarily be bonded to the sheets  2   a,    2   b.    
       FIG. 14  illustrates a region outside each joining region  39  in the waistline direction (width direction) X. Although in the region, the sheets  2   a,    2   b  are bonded to each other with a dotted-line bonding section  41  formed of a plurality of points dotted in a wavy line shape, the sheets  2   a,    2   b  are not bonded to the elastic member  10 . 
     As illustrated in  FIG. 14 , the disposable diaper  30  of the present embodiment includes at least one second bonding section  42  that linearly extends in the width direction B of the composite stretchable member  1 , i.e., a width direction Y of the waistline portion  31 , and that is formed between the joining region  39  and the first bonding section  4  closest to the joining region  39 .  FIG. 14  illustrates an example in which a plurality of (two) second bonding sections  42  are formed side by side in the waistline direction X. 
     In the present embodiment, the weakened region  32   b  including the overlapped portion S has an edge extending linearly in the width direction Y. Between the weakened region  32   b  including the overlapped portion S and the first bonding section  4  closest to the weakened region  32   b  (overlapped portion S), at least one third bonding section  43  linearly extending in the width direction B is formed. 
     The disposable diaper  30  configured as described above is manufactured as follows. 
     First, a continuous body, in which the crotch portion  34  is integrated with a pair of composite stretchable members  1  for forming the front abdomen portion  32  and the rear back portion  33  of the waistline portion  31 , is prepared. 
     When the composite stretchable member  1  illustrated in  FIGS. 13 and 14  is manufactured, not only the plurality of first bonding sections  4  in a wavy line shape, but also dotted-line bonding sections  40  in the weakened regions  32   b,    33   b,  dotted-line bonding sections  41 , the second bonding sections  42  in a linear shape, and third bonding sections  43  near the weakened regions  32   b,    33   b,  are required to be continuously formed in the composite stretchable member  1  for performing ultrasonic welding. Thus, the outer peripheral surface of the anvil roll  210  is provided with not only the protrusion  212  (see  FIG. 11 ) corresponding to the first bonding section  4  in a wavy line shape, but also protrusions having shapes corresponding to the dotted-line bonding sections  40 ,  41 , the second bonding section  42 , and the third bonding section  43 . Then, the ultrasonic welding is performed using the anvil roll  210  having the plurality of types of protrusion described above. 
     After the ultrasonic welding, the composite stretchable member  1  is subjected to a weakening process in which the elastic members  10  in the weakened regions  32   b,    33   b  are cut so as not to expand and contract in the weakened regions. 
     After the leg hole  35  is formed in the crotch portion  34 , the crotch portion  34  is folded in half at an intermediate position of the crotch portion (an intermediate position in the width direction Y orthogonal to the waistline direction X) to allow the crotch portion  34  to be positioned inside. 
     Then, the joining regions  39  at the opposite ends of the front abdomen portion  32  in the waistline direction X and the joining regions  39  at the opposite ends of the rear back portion  33  therein are bonded to each other by the ultrasonic welding to form side seals, thereby forming a shape of the disposable diaper  30 . After that, when the disposable diaper  30  is separated from an adjacent continuous body of a pair of composite stretchable members  1 , the disposable diaper  30  is completed. 
     Features of the Present Embodiment 
     (1) 
     The composite stretchable member  1  of the present embodiment includes the two sheets  2   a ,  2   b  facing each other, and the plurality of elastic members  10  extending along the longitudinal direction A so as to be stretchable in the longitudinal direction A between the sheets  2   a,    2   b.  The sheets  2   a,    2   b  are bonded to each other at the plurality of first bonding sections  4 . Each first bonding section  4  continuously extends along the width direction B intersecting the longitudinal direction A and intersects the plurality of elastic members  10 . Each elastic member  10  is bonded to each of the sheets  2   a,    2   b  at the intersection  4   a  with the corresponding one of the first bonding sections  4 . Each first bonding section  4  has a wavy line shape extending in the width direction B with the convex portions  4   b  and the concave portions  4   c  that alternately appear continuously. Two of the first bonding sections  4 , being adjacent to each other, are at least partially (entirely in the first bonding section  4  in the present embodiment) disposed with the convex portions  4   b  overlapping each other or the concave portions  4   c  overlapping each other when viewed from the longitudinal direction A. 
     This configuration causes pleats in a wavy line shape to be formed along the respective first bonding sections  4  in a wavy line shape when the composite stretchable member  1  contracts, and thus enables a unique texture to be expressed by the composite stretchable member  1 . As a result, the disposable diaper  30  of the present embodiment can be manufactured as a wearing article having high design properties using the composite stretchable member  1 . 
     (2) 
     The composite stretchable member  1  of the present embodiment includes two adjacent first bonding sections  4  that are disposed with both the bonding sections  4  coinciding in phase with each other in the width direction B in at least one region. This configuration enables forming a plurality of pleats in a wavy line shape coinciding in phase when the composite stretchable member  1  contracts, and thus enables manufacturing the disposable diaper  30  (wearing article) having higher design properties. 
     (3) 
     The composite stretchable member  1  of the present embodiment includes the plurality of first bonding sections  4  disposed at intervals that are set to have a space between two adjacent first bonding sections  4 , being closed by the convex portion  4   b  of at least one of the two first bonding sections  4  when viewed from the width direction B. This configuration causes the convex portion  4   b  of any one of the two first bonding sections  4  to exist between the two adjacent first bonding sections  4  when viewed from the width direction B, so that fluctuations in pressure when the two sheets  2   a,    2   b  are sandwiched between the protrusions  212  of the anvil roll  210  and the output unit  221  of the horn  220  to form the plurality of first bonding sections  4  can be reduced at any position in the width direction B, and thus the first bonding sections  4  without unevenness (specifically, unevenness in height and adhesion strength of the first bonding sections  4 ) can be formed. This configuration also enables reducing vibrations of the anvil roll  210 , the horn  220 , and the like, which are means for applying pressure to the two sheets  2   a,    2   b  to form the first bonding sections  4 . 
     The disposable diaper  30 , which is a wearing article of the present embodiment, includes the waistline portion  31  to be disposed around a waistline of a wearer. At least a part of the waistline portion  31  is formed of the composite stretchable member  1  of the present embodiment. As a result, pleats in a wavy line shape are formed along each first bonding section  4  as described above, and a unique texture is expressed by the composite stretchable member  1 . This enables manufacturing the disposable diaper  30  having high design properties. 
     The disposable diaper  30 , which is a wearing article of the present embodiment, includes the waistline portion  31  having the front abdomen portion  32  disposed on the front of the abdomen of a wearer and the rear back portion  33  disposed on the buttocks of the wearer. The waistline portion  31  is formed in an annular shape by joining the front abdomen portion  32  to the rear back portion  33  with the pair of joining regions  39 . The front abdomen portion  32  and the rear back portion  33  are formed of the composite stretchable member  1 . The composite stretchable member  1  is disposed with the longitudinal direction A aligning with the waistline direction X of the waistline portion  31 . The joining regions  39  each include at least partially a non-formation region where the intersection  4   a  of the first bonding section  4  and the elastic member  10  is not formed. 
     This configuration causes each joining region  39  joining the front abdomen portion  32  to the rear back portion  33  to include at least partially the non-formation region where the intersection  4   a  of the first bonding section  4  and the elastic member  10  is not formed, so that the elastic member  10  is not bonded to the sheets  2   a,    2   b.  Thus, each joining region  39  does not expand and contract with the elastic member  10 , so that flexibility of the sheets  2   a,    2   b  can be maintained. 
     The disposable diaper  30 , which is a wearing article of the present embodiment, includes the joining regions  39  extending linearly in the width direction B, and at least one second bonding section  42  that linearly extends in the width direction B and that is formed between each of the joining regions  39  and the first bonding section  4  closest to the corresponding one of the joining regions  39 . This configuration enables the second bonding section  42  extending linearly to bond an end portion of the elastic member  10  to the sheets  2   a,    2   b  with a good appearance at a position closer to the joining region  39  than the first bonding section  4 . As a result, the design properties in the disposable diaper  30  (wearing article), particularly, in a portion near the joining region  39 , is further improved. 
     (7) 
     The disposable diaper  30 , which is a wearing article of the present embodiment, includes a plurality of second bonding sections  42  formed side by side. This configuration enables the plurality of second bonding sections  42  to reliably hold the end portion of the elastic member  10 . 
     (8) 
     The disposable diaper  30 , which is a wearing article of the present embodiment, includes the absorbent body  37  that absorbs liquid. The absorbent body  37  is overlapped with and fixed to the composite stretchable member  1  constituting the waistline portion  31 . In a region other than the overlapped portion S where the absorbent body  37  is overlapped with the composite stretchable member  1 , the intersection  4   a  of the first handing section  4  and the elastic member  10  are formed, and the elastic member  10  is disconnected in the overlapped portion S. 
     This configuration causes no intersection  4   a  of the first bonding section  4  and the elastic member  10  to be formed in the overlapped portion S where the absorbent body  37  is overlapped with the composite stretchable member  1  constituting the waistline portion  31 , and causes the elastic member  10  to be disconnected. Thus, the overlapped portion S does not partially contract, so that the absorbent body  37  can be stably held in the waistline portion  31 , thereby enabling occurrence of wrinkles in the absorbent body  37  to be reduced. 
     (9) 
     The disposable diaper  30 , which is a wearing article of the present embodiment, includes the overlapped portion S (in the present embodiment, the weakened region  32   b  including the overlapped portion S) having an edge extending linearly in the width direction Y, and at least one third bonding section  43  that extends linearly in the width direction B and that is formed between the overlapped portion S and the first bonding section  4  closest to the overlapped portion S. 
     This configuration enables the third bonding section  43  extending linearly to bond the end portion of the elastic member  10  to the sheets  2   a,    2   b  with a good appearance at a position closer to the overlapped portion S than the first bonding section  4 , and thus the design properties in the disposable diaper  30  (wearing article), particularly, in a portion near the overlapped portion  5 , is further improved. Although at least one third bonding section  43  needs to be provided, a plurality of third bonding sections  43  may be provided. 
     Other Embodiments 
     Although in the above embodiment, the disposable diaper of an underpants-type has been described as an example of the wearing article, the present invention is not limited thereto, and thus can be applied to any wearing articles of various forms including the composite stretchable member and the absorbent body  37 . Thus, the wearing article of the present invention can be applied to not only disposable diapers of an underpants-type but also disposable diapers of various forms such as a tape type and a pad type, and also can be applied to sanitary napkins and the like. 
     Summary of Embodiment 
     The above embodiment is summarized as follows. 
     The composite stretchable member according to the present invention is stretchable in a specific direction and includes two sheets facing each other, and a plurality of elastic members extending along the specific direction and being stretchable in the specific direction between the sheets, the sheets being bonded to each other at a plurality of first bonding sections, each of the first bonding sections continuously extending along an intersecting direction intersecting the specific direction to intersect the plurality of elastic members, each of the elastic members being bonded to each of the sheets at an intersection with the corresponding one of the first bonding sections, each of the first bonding sections having a wavy line shape extending in the intersecting direction with convex portions and concave portions that alternately appear continuously, and being disposed in a state where the convex portions and the concave portions are overlapped each other when viewed from the specific direction in at least a part of two adjacent first bonding sections. 
     This configuration causes pleats in a wavy line shape to be formed along the respective first bonding sections in a wavy line shape when the composite stretchable member contracts, and thus enables a unique texture to be expressed by the composite stretchable member. As a result, a wearing article having high design properties can be manufactured using the composite stretchable member. 
     The composite stretchable member above preferably includes the two adjacent first bonding sections that are disposed with both the bonding sections coinciding in phase with each other in the intersecting direction in at least one region. 
     This configuration enables forming a plurality of pleats in a wavy line shape coinciding in phase when the composite stretchable member contracts, and thus enables manufacturing a wearing article having higher design properties. 
     The composite stretchable member above preferably includes the plurality of first bonding sections disposed at intervals that are set to have a space between the two adjacent first bonding sections, being closed by the convex portion of at least one of the two first bonding sections when viewed from the intersecting direction. 
     This configuration causes the convex portion of any one of the two first bonding sections to exist between the two adjacent first bonding sections when viewed from the intersecting direction, so that fluctuations in pressure under which the two sheets are sandwiched to form the plurality of first bonding sections can be reduced at any position in the intersecting direction, and thus the first bonding sections without unevenness can be formed. This configuration also enables reducing vibrations of means for applying pressure to the two sheets to form the first bonding sections. 
     A wearing article of the present invention includes a waistline portion disposed around a waistline of a wearer, wherein at least a part of the waistline portion is formed of the composite stretchable member. This configuration enables manufacturing a wearing article having high design properties. 
     The wearing article described above is preferably configured as follows: the waistline portion has a front abdomen portion disposed on the front of the abdomen of a wearer and a rear back portion disposed on the buttocks of the wearer; the waistline portion is formed in an annular shape by joining the front abdomen portion to the rear back portion with a pair of joining regions; the front abdomen portion and the rear back portion are formed of the composite stretchable member; the composite stretchable member is disposed with the specific direction aligning with a waistline direction of the waistline portion; and the regions each include at least partially a non-formation region where an intersection of the first bonding section and the elastic member is not formed. 
     This configuration causes each joining region joining the front abdomen portion to the rear back portion to include at least partially the non-formation region where the intersection of the first bonding section and the elastic member is not formed, so that the elastic member is not bonded to the sheets. Thus, each joining region does not expand and contract with the elastic member, so that flexibility of the sheets can be maintained. 
     The wearing article described above preferably includes the joining regions extending linearly in the intersecting direction, and at least one second bonding section that linearly extends in the intersecting direction and that is formed between each of the joining regions and the first bonding section closest to the corresponding one of the joining regions. 
     This configuration enables the second bonding section extending linearly to bond an end portion of the elastic member to the sheets with a good appearance at a position closer to the joining region than the first bonding section, and thus the design properties in the wearing article is further improved. 
     The wearing article above preferably includes a plurality of second bonding sections formed side by side. 
     This configuration enables the plurality of second bonding sections to reliably hold the end portion of the elastic member. 
     The wearing article described above preferably further includes an absorbent body that absorbs liquid, wherein the absorbent body is overlapped with and fixed to the composite elastic member constituting the waistline portion, in a region other than an overlapped portion in the composite stretchable member where the absorbent body is overlapped with the composite stretchable member, an intersection of the first bonding section and the elastic member are formed, and the elastic member is disconnected in the overlapped portion. 
     This configuration causes no intersection of the first bonding section and the elastic member to be formed in the overlapped portion where the absorbent body is overlapped with the composite stretchable member constituting the waistline portion, and causes the elastic member to be disconnected. Thus, the overlapped portion does not partially contract, so that the absorbent body can be stably held in the waistline portion, thereby enabling occurrence of wrinkles in the absorbent body to be reduced. 
     The wearing article described above preferably includes the overlapped portion having an edge extending linearly in the intersecting direction, and at least one third bonding section that extends linearly in the intersecting direction and that is formed between the overlapped portion and the first bonding section closest to the overlapped portion. 
     This configuration enables the third bonding section extending linearly to bond an end portion of the elastic member to the sheets with a good appearance at a position closer to the overlapped portion than the first bonding section, and thus the design properties in the wearing article is further improved. 
     As described above, the composite stretchable member of the present embodiment and the wearing article using the same enable improvement in design properties of the composite stretchable member and the wearing article using the same by forming a plurality of pleats in a wavy line shape when the composite stretchable member contracts.