A method for manufacturing a fabric with low porosity and spreading

The invention relates to a method for manufacturing a fabric with low porosity, wherein the weaving of the fabric (1) of the fiber strands (2, 3) and the immediately subsequent spreading of the fabric (1) in-line take place in a device. In the used therefor spreading the to spreading fabric (1) between a bearing surface (6) of an anvil (5) and a contact surface (8) at least one sonotrode (7) with two-sided contact of the two aforesaid surfaces (6, 8) guided and means by the sonotrode (7) in the web (1, 1 ') introduced vibrations, the multifilament of the fabric (1, 1') transversely spread to the grain direction, thus increasing the size of the pores (4) of the fabric (1, 1 ') is reduced.