Patent ID: 7581294

Claim:
A method for producing a solidified nonwoven web by crosslaying a card web produced with a uniform transverse profile by a card web forming device and then by solidifying the crosslaid nonwoven web thus formed, wherein the basis weight of the solidified nonwoven web is measured continuously and the measurement values are used to influence the laying of the card web, the method comprising the steps of: determining laws which govern the changes, caused by the solidifying method, in the basis weight distribution of the crosslaid nonwoven web under consideration of a plurality of production parameters; storing the laws in a control unit; measuring the basis weight of the solidified nonwoven web only in the middle and in the area of at least one of its edges by means of sensors located at these points; comparing the measurement values with the nominal values of the basis weight of the solidified nonwoven web preestablished by the laws; and changing one or more production parameters on the basis of the comparison under consideration of the stored laws.