Laminated non-woven fabric and process for producing the same

A process for producing a laminated multi-layer non-woven fabric comprising the steps of;

• spinning a low melting point resin and a high melting point resin having a melting point difference of 10.degree. C. or more to form composite long fibers in such a manner that said low melting point resin forms at least a part of fiber surface, forming a web or forming a non-woven fabric by heating the web after the spinning at the heat-melt adhering temperature of said web or higher to form a non-woven fabric in which fibers are heat-melt adhered, by a composite, spun bond method;
• forming low melting point ultrafine fibers and high melting point ultrafine fibers both of said fibers having an average fiber diameter of 10 .mu.m or less and having a melting point difference between both of said fibers of 10.degree. C. or more,
• into a web of ultrafine mixed fibers having no self-heat-melt adhesion or having a self-heat-melt adhesion at the time of the spinning,
• into a non-woven fabric having self-heat-melt adhesion at the time of the spinning, or
• into a non-woven fabric of melt-blown ultrafine mixed fibers in which fibers are heat-melt adhered by heating the web after the spinning at the heat-melt adhering temperature of the web or higher, and
• each comprising 10 to 90% by weight of low melting point ultrafine fibers and 90 to 10% by weight of high melting point ultrafine fibers, by a melt-blow mixed fiber method;
• laminating the layer of said composite, spun bonded web or heat-melt adhered non-woven fabric with the layer of said web of melt-blown ultrafine mixed fibers or heat-melt adhered non-woven fabric of melt-blow ultrafine mixed fibers, and heating them at the temperature at which both of said layers are heat-melt adhered or higher.