Patent ID: 6846376

Claim:
A process of making an elastic composite sheet, said process comprising the steps of: feeding an inelastic web and an elastic web placed one upon another together into a nip of first and second rolls opposed to each other, wherein: the first roll has on a peripheral surface thereof a plurality of ridges each projecting outward radially and extending circumferentially of said first roll, said ridges being arranged at predetermined intervals in an axial direction of said first roll, and the second roll has on a peripheral surface thereof a plurality of grooves each being recessed inward radially and extending circumferentially of said second roll, said grooves being arranged at predetermined intervals in an axial direction of said second roll; engaging said ridges with said grooves with spaces left between surfaces of said ridges and said grooves to form on a surface of said inelastic web a plurality of crests extending in one direction and a plurality of flat troughs each being located between one pair of the adjacent crests; and bonding said inelastic web along said troughs to said elastic web; wherein said elastic web is fed directly into said nip without being pre-stretched; and in said engaging step, an inner surface of each of the grooves in the nip is physically spaced from both said webs.