Flash condensing with steam

摘要

The breakthrough concept is the use of vapor combined with largely dry fibers to form paper and board. It works by introducing high-consistency fibers, fillers and chemicals into highly turbulent steam. The steam carries the fibers into the forming zone, where the combination of condensing and steam expansion creates the paper sheet and enables bonding. High gas velocities make the forming section very short. Very little extra heating is required for drying, as water content after the wire is less than 30%.