Twin-wire former in a machine for the production of a fibrous web, and a method for producing a fibrous material web

摘要

A twin wire former (1) in a machine for producing a fibrous web, in particular a paper - or cardboard web, from at least one fibrous suspension with a double screen section (2) with two circulating, endless seven (support screen (3), upper wire (4)), wherein the support screen (3) at the beginning of the double screen section (2) over a circumferential area of a forming roll (6) is guided and the upper sieve (3) at the output of the double screen section (2) over a circumferential region a further roller (19) is guided, is characterized in that the forming roll (6) and / or the wire suction roll (19) and at least one of the forming roll (6) in the direction of travel of the downstream roller on its outer surfaces have a secondary structure.