METHOD FOR DETECTING DEFECTS IN A NONWOVEN SUBSTRATE
FIG1 is a schematic drawing showing an embodiment of the present invention comprising two rollers
FIG1 shows a system wherein the web 30 is transported between two opposing surfaces, preferably the two opposing surfaces are opposing surfaces of adjacent rotating rolls 11, 12. In this embodiment pressure is applied to the nonwoven substrate by transporting the nonwoven substrate through a nip 13 between the rotating rolls 11, 12. Alternatively the nonwoven substrate may be transported over slide bars, i.e. bars which do not rotate or which rotate at a slower speed relative to the speed of the web.
schematic
14
roller
5
US
30
web
20
tactile sensor
40
mean "about
13
nip
['2. The method according to Claim 1 wherein the detection zone (40) is situated at a nip (13) between a pair of rotating rolls (11, 12) and wherein the nonwoven web (30) is advanced through the nip (13) formed between the pair of rolls (11, 12).', '6. The method according to any of the previous Claims wherein the sensor (20) is a tactile sensor which is configured to measure pressure up to about 3500 kPa,']