Modified Polysulphide (Aq) Pulping Of Softwood
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A review of the polysulphide (PS) liquor generation methods has
been made. By preparing some PS liquors which simulate future
possibilities, pilot scale PS-(AQ) pulping studies were
conducted. The studies were carried out in a recently acquired
pilot plant which can simulate both conventional cooking
techniques as well as the latest pulping developments. Two types
of pulps were made, type 1 were liner board grade pulps and
type 2 were bleachable grade pulps. Type 1 pulps were made by
using up to 20% green PS-liquor in conventional PS-AQ
pulping. Type 2 pulps were made by adding all PS in the
impregnation stage of ITC simulated cooks and applying either
NaOH (Soda liquor) or kraft liquor (WL) as the major alkali
source.