THE EFFECT OF LIGNIN CONTENT OF WOOD FIBERS ON PULP SCREENING/SEPARATION

Abstract

An experimental investigation of the effect of lignin content of wood fibers on pulp screening is conducted. A non-uniform lignin distribution may exist in wood pulp due to variations in wood chip characteristics, and/or cooking conditions in a digester. Pulp screening was conducted in a modified Williams Freeness tester at different fiber lignin contents and pulp consistencies. The study indicated a large drop in pulp accepts fraction, thus a substantial fiber loss, with an increase in lignin content. The fiber loss was more significant at higher consistencies of pulp. This study suggests that the fiber lignin content should be considered an important process variable affecting the efficiency of pulp screening processes.

KEYWORDS:

• Lignin content
• Wood fibers
• Pulp Screening
• Separations

Additional information

Notes on contributors

S.V. JAGANNADH

Author to whom correspondence should be sent.