Pants-type disposable wearing article

Abstract

A pants-type disposable wearing article wherein each of the side seams has a desired joint strength and the joint should not unintentionally be released particularly in the bottom segment during use of the wearing article. Respective side seams are formed of a plurality of sealing spots arranged in a direction along a longitudinal axis. Each of the seam arrays includes a top segment lying in the vicinity of a peripheral edge of each waist-opening and a bottom segment lying in the vicinity of a crotch region wherein each of the sealing spots has a substantially uniform area and a dimension of the bottom segment in a direction along a transverse axis is larger than a dimension of the top segment in the direction along the transverse axis.

1 . A pants-type disposable wearing article having a longitudinal axis and a transverse axis being orthogonal thereto, comprising:
 a front waist region;   a rear waist region;   a crotch region extending between the front and rear waist regions;   a waist-opening; and   side seams by which the front and rear waist regions are joined together along opposite side edges thereof, wherein:   the side seams are respectively formed of a plurality of sealing spots arranged intermittently in a direction along the longitudinal axis and comprises a top segment located in the vicinity of the waist-opening and a bottom segment located in the vicinity of the crotch region; and   each of the sealing spots has a substantially uniform area and a dimension of the bottom segment in a direction along the transverse axis is larger than a dimension of the top segment in the direction along the transverse axis.   
     
     
         2 . The wearing article according to  claim 1 , wherein a dimension of the side seam array in the direction along the longitudinal axis is gradually reduced from the outside toward the inside as viewed in the direction along the transverse axis in the bottom segment of the side seam array. 
     
     
         3 . The wearing article according to  claim 1  wherein:
 the side seam includes an intermediate segment extending between the top segment and the bottom segment; 
 the opposite side edges of the front and rear waist regions respectively comprise:
 non-elasticized regions formed of a non-elasticized outer sheet; 
 first elasticized regions lying below the non-elasticized regions and formed of the outer sheet and an elasticized inner sheet; and 
 second elasticized regions lying below the first elasticized regions and formed of the inner and outer sheets and stretchable leg elastic elements bonded to the inner and outer sheets; and 
 
 the top segments are formed in the non-elasticized regions, the intermediate segments are formed in the first elasticized regions and the bottom segments are formed in the second elasticized regions. 
 
     
     
         4 . The wearing article according to  claim 1 , wherein an area ratio of the sealing spots in the top segment formed in the non-elasticized region is lower than both of an area ratio of the sealing spots in the intermediate segment formed in the first elasticized region and an area ratio of the sealing spots in the bottom segment formed in the second elasticized region. 
     
     
         5 . The wearing article according to any  claim 1 , wherein the sealing spots are arranged obliquely to the longitudinal axis and shaped so that a width dimension of the sealing spots is gradually enlarged in a direction of top-to-bottom.