lateral stretch stations until a total draw ratio of 16 0 is reached at which point the web exhibited the following properties ______________________________________basis weight 6 2 gm m sup 2filament denier 0 1 1tear strength tensile 98 4 gm cm linear tensile tear length 1587 meters______________________________________ the tensile tear length per basis weight expressed as meters of the product is 1587 as compared with that of 785 of the starting polypropylene fibrous material a commercially available spun bonded web of continuous polyester fiber having the following properties is processed in grooved rollers having a depth of 2 5 mm and a width of 5 0 mm draw ratio is 1 6 ______________________________________basis weight 63 gm m sup 2filament denier 15tear strength tensile 1102 gm cm linear filament elongation 250 ______________________________________ the web is introduced into the rollers 16 at a surface velocity of 3 05 meters per minute and is withdrawn by tension rollers 22 at a velocity of 4 88 meters per minute after passage through two complete stretchings operations both including longitudinal and lateral stations the web exhibited the following properties ______________________________________basis weight 25 gm m sup 2filament denier 6tear strength tensile 787 4 gm cm______________________________________ tensile tear length meter of the product is 3149 6 meters as compared to 1749 2 of the starting polyester material a latex bonded randomly laid non woven web consisting of 1 27 cm polyester staple fibers having the following properties is processed in accordance with the present invention ______________________________________basis weight 32 gm m sup 2filament denier 7tear strength tensile 157 5 gm cm linear ______________________________________ the respective rollers.