Patent ID: 8551608

Claim:
A composite sheet comprising an elastic nonwoven fabric in an elongated state bonded to a non-elastic sheet, wherein at least one surface of the composite sheet has a contact area ratio of at least 65% at a time of 135% elongation and at a time of 170% elongation, and the composite sheet has an airflow resistance value of no greater than 0.20 KPa·s/m at a time of 150% elongation, and wherein the contact area ratio is an area percentage of a water-based paint transferred to a filter paper after being applied onto one surface of the composite sheet in the elongated state, with the filter paper superimposing the water-based paint being retained thereon for 10 seconds under 250 g of weight, and wherein the elastic nonwoven fabric has a plurality of strip-shaped low-density regions and a plurality of strip-shaped high-density regions formed therein and are alternately and continuously formed on both sides thereof, with the strip-shaped high-density regions on one surface and the strip-shaped high-density regions on the other surface being alternately formed.