Twin-wire former of a machine for producing a fibrous web

摘要

Twin wire former for a paper machine, comprising two endless screens (4, 5) forming a twin wire zone with a wedge-shaped nip (9), comprises a first screen (4) on which pulp slurry deposited from a headbox (13) passes over a predewatering section (10) comprising just one dewatering device (12) for initial sheet formation and a second screen (5) that runs onto the first screen only after initial sheet formation.