A process and an enzyme preparation with steryl esterase activity for controlling pitch during paper manufacture

摘要

The present invention concerns a process and an enzyme preparation for enzymatic control of extractives during paper manufacture. According to the invention pulp suspensions and/or process waters from pulping, bleaching and/or paper manufacture process are treated with an enzyme preparation comprising enzyme activity capable of hydrolyzing the ester linkage in the steryl esters of wood extractives. As a result of the enzyme treatment, the runnability of the paper machine is improved and there are less sticky spots and yellowing in the paper, which result in better paper product quality.