Semichemical pulping process definition
Semichemical pulping process means any pulp manufacturing process in which the active chemicals of the liquor used in cooking (digesting) wood chips to their component parts in a pressurized vessel (digester) are primarily a liquor of sodium hydroxide and sodium carbonate. The major difference between all semichemical techniques and those of kraft and acid sulfite processes is that only a portion of the lignin is removed during the cooking (digesting), after which the pulp is further reduced by mechanical disintegration.