Patent ID: 7909807

Claim:
A method of manufacturing pants-type disposable wearing articles, comprising: feeding an elastically stretchable cover sheet web in a machine direction while stretching said cover sheet web at a first stretching ratio in said machine direction; during said feeding, attaching leg surrounding elastic members in two zigzag patterns to said cover sheet web while longitudinally stretching said elastic members at a second stretching ratio; after said feeding, cutting said cover sheet web to form leg holes in regions surrounded by said zigzag patterns and to separate cover sheets of individual articles from each other; and after said cutting, bonding an absorbent panel to each of the separated cover sheet and bonding transversely opposite edges of said cover sheet with one another to from one of the pants-type disposable wearing articles; wherein said first and second stretching ratios are chosen taking into account elasticity of all materials of said cover sheet web and leg surrounding elastic members, so that when the cover sheet and the leg surrounding elastic members in each of the pants-type disposable wearing article are relaxed, said leg surrounding elastic members and said cover sheet have substantially the same dimension in a leg surrounding direction and said cover sheet is free of wrinkles along the leg holes thereof, said method further comprising during said feeding, attaching waist surrounding elastic members along longitudinal sides of said cover sheet web while longitudinally stretching said waist surrounding members at a third stretching ratio; wherein said first and third stretching ratios are chosen taking into account elasticity of all materials of said cover sheet web and waist surrounding elastic members, so that when the cover sheet and the waist surrounding elastic members in each of the pants-type disposable wearing article are relaxed, said waist surrounding elastic members and said cover sheet have substantially the same dimension in a waist surrounding direction and said cover sheet is free of wrinkles along a waist hole thereof.