Disposable diaper backsheet comprising composite having an elastic layer, inelastic layer and bonding pattern of obliquely intersecting lines

A disposable diaper having a front waist region, a rear waist region and a crotch region therebetween, said diaper further comprising a liquid-permeable top sheet, a liquid-impermeable back sheet and a liquid-absorbent core disposed therebetween, said diaper having a longitudinal direction from said front waist region to said rear waist region, and a transverse direction that is substantially normal to said longitudinal direction;

• wherein:
• said back sheet, in at least said front waist region, comprises an elastic inner layer extending throughout an entire front panel and an inelastic outer layer overlapped with said elastic inner layer;
• said elastic inner layer and said inelastic outer layer are joined to each other at a plurality of intermittently arranged spots, wherein said spots are arranged to form imaginary lines that are obliquely disposed with respect to said transverse direction;
• said imaginary lines intersect with each other to form a series of closed figures and each side of said closed figures includes plural said spots;
• said inner and outer layers have been joined to each other at said spots when said elastic inner layer was in a transversely stretched condition so that, when said stretched inner layer is relaxed and thereby contracted transversely of said diaper, said outer layer forms a plurality of substantially longitudinal pleats;
• said inner and outer layers are not directly joined to each other within a perimeter of any of said closed figures;
• said front panel extends from the front waist region down to a region that is coelevational with an upper end of leg openings formed in the diaper;
• said diaper further comprises at least one circumferentially extending elastic member extending along a waist opening defined by longitudinally opposite edges of said front and rear waist regions, respectively, when the diaper is being worn by a wearer;
• and
• all of said spots are longitudinally spaced from said circumferentially extending elastic member.