FI885609A - HYBRIDFORMARE FOER EN PAPPERSMASKIN. - Google Patents

Abstract

Hybrid former in a paper machine which includes a lower wire loop 10 in cooperation with the headbox of the paper machine, which forms, beneath the wire loop, a first drainage zone 10a with a single wire, in which zone water is removed from web W, which is formed by means of a drainage device inside of the wire loop through the lower wire 10, and an upper wire unit 50, in which an upper wire loop 20 is situated which is guided by a guiding and web forming roll 21, 22, 23, 24, which, after the first drainage zone together with the trend of the lower wire 10 form a second drainage zone with double wire. The former includes a first forming roll 21 which is arranged inside of the upper wire loop 20 and is provided with concave surfaces 21' in which A forming roll the mentioned second drainage zone with double wire begins. This zone bending upward in a given sector a of this forming roll 21, as well as a forming shoe 14, which is arranged inside of the lower wire loop 10 which guides said second drainage zone following said forming roll 21, said forming shoe having a bent cover 14a that guides the lower wire loop 10, in which the center of bending or center of the cover is on the side of the lower wire loop 10. In the mentioned drainage zone with the double wire between said first forming roll 21 and said forming shoe 14 deflector units 100, 110 are arranged, both inside of the second wire loop 10 and the upper wire loop 20, with which units sufficiently strong, formation-improving pulses are created that act on both sides of the web W being formed. After the bent edge cover 14a of said forming roll 14 a forming roll 15, 22 follows, in which zone with the double wire bends downward in a given sector b, c of forming roll 14, 22 which is bent downward (Figure 1) or upward. <IMAGE>