2 INDUSTRY NEWS
Pulp Paper & Logistics
Will orange become the new white? The advantages of polysulfide cooking
With the success of its poly- sulfide
cooking installation at
one of the world’s most recog- nized pulp mills, ANDRITZ has added a new color to its palette. Polysulfide cooking liquor has a dis- tinctive orange color. The process increases yield for the pulp produc- er – and improves pulp properties
for papermakers. Polysulfide liquors are created by oxidizing the sodium sulfide in white liquor in a proven MOXY process. When added at the impregnation stage of
the cooking
process, the orange liquor oxidizes the end groups of
the hemicellulos-
es and slows down alkaline peeling reactions – resulting in higher yield.
More importantly, polysulfide cook- ing improves several pulp properties: beatability, tensile strength, stiffness, and internal bond strength. Contact us today at
fiberline@andritz.com to discuss whether polysulfide cooking is right for your mill.
www.andritz.com July/August 2014
We accept the challenge!
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