Patent ID: 8349103

Claim:
A method of producing a high tenacity nonwoven fabric, comprising the steps of: spinning filamentary fibers in at least one layer out of a thermoplastic synthetic resin on a conveyor, melt blowing fine fibers having a crystallinity from 17.8% or more to 34.3% out of a polyester resin, which is prepared by polymerizing an aromatic dicarboxylic acid and a diol, or a polyamide resin in at least one layer, on the filamentary fibers, wherein a portion of the fine fibers is intruded into at least one face side of the filamentary fiber layer with an intrusion index of 0.36 or more to bond, surround or interlace the filamentary fibers, placing filamentary fibers formed out of a thermoplastic synthetic resin in at least one layer, on the fine fiber layer, and integrating the stacked fiber layers by thermocompressive bonding with emboss rolls or flat rolls at thermocompressive bonding temperature from 10 to 80° C. below the melting point of the filamentary fibers at a line pressure from 100 to 1,000 N/cm.