| abstract |
A composite sheet structure comprising (A) a nonwoven web composed of (a) continuous filaments of a synthetic resin and (B) a net-like web having intersecting points and being composed of (b) continuous net strands of a mixture consisting of at least two thermoplastic synthetic resins having different melting points, said web (A) and said web (B) being bonded to each other by heating; characterized in that (i) said web (A) has a basis weight of about 2 to about 30 g/m2, (ii) said web (B) has a basis weight of about 1 to 10 g/m2, an average net strand diameter of about 1 to about 100 microns, and an average mesh length of up to about 5 mm, and said net strands (b) are composed of at least two resins having melting points differing from each other by at least about 20 DEG C., of which a resin having the lowest melting point has a melting point at least about 20 DEG C. lower than that of said filaments (a) and is present in an amount of about 5 to about 95% by weight based on the weight of said resin mixture, (iii) the amount of said web (A) is about 30 to about 90% by weight based on the total weight of said webs (A) and (B), (iv) said composite sheet structure has a basis weight of about 10 to about 200 g/m2, and (v) said filaments (a) are partly embraced by said net strands (b) throughout the composite sheet structure. |