Pulping process
The results of studies on soda–AQ pulping of extracted and un-extracted (control) samples conducted during this investigation are given in Table 4. The cook at 11% active alkali provided pulps that had a high Kappa number, and contained too much uncooked material that was difficult to disintegrate into fibers, so it was not possible to make sheets from them. Hence, the amount of active alkali was chosen at 12%. Analysis of pulps prepared using 12% active alkali showed that either lignin precipitation had occurred, and/or lignin within the fiber walls had not been sufficiently removed, as indicated by the high Kappa number. To obtain low Kappa number, the charge of active alkali used had to be increased. With increasing the active alkali charge from 12 to 18%, the Kappa number decreased while the screened yield increased. An increase in the active alkali above 18% generally led to limited improvements in the screened pulp yield and Kappa number.
Pulping processThe results of studies on soda–AQ pulping of extracted and un-extracted (control) samples conducted during this investigation are given in Table 4. The cook at 11% active alkali provided pulps that had a high Kappa number, and contained too much uncooked material that was difficult to disintegrate into fibers, so it was not possible to make sheets from them. Hence, the amount of active alkali was chosen at 12%. Analysis of pulps prepared using 12% active alkali showed that either lignin precipitation had occurred, and/or lignin within the fiber walls had not been sufficiently removed, as indicated by the high Kappa number. To obtain low Kappa number, the charge of active alkali used had to be increased. With increasing the active alkali charge from 12 to 18%, the Kappa number decreased while the screened yield increased. An increase in the active alkali above 18% generally led to limited improvements in the screened pulp yield and Kappa number.
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