Nonwoven fabric and filter medium made thereof and process for producing it

摘要

A nonwoven fabric comprises fibers at least some of which are of thermoplastics material. At least 50% by number of all the fibers of the nonwoven fabric constitute fiber bundles formed by bonding a plurality of single fibers which are of the thermoplastics material. The fiber bundles are arranged substantially in the same direction as one another. The nonwoven fabric may be employed in a filtering device and a particularly useful filter medium comprises a laminate of the nonwoven fabric with an air permeable fibrous sheet.