Patent ID: 9145640
Filing Date: 2015-09-29
Classification: D21B,D21C

Abstract:
1. A method for preparing thermomechanical pulp (TMP), the method comprising the steps of: (i) exposing compressed wood chips to an enzymatic solution for a period of time from about 30 minutes to about 2 hours at a temperature between 20 and 80° C. and within a pH between 2 and 10, the solution comprising an endoglucanase (EG), a cellobiohydrolase (CBH), and a mannanase (MAN) wherein the ratio of enzymatic activity of EG:CBH is at least 10 and of MAN:CBH is at least 1.5, and permitting the wood chips to decompress; and (ii) refining the product of step (i) to produce the thermomechanical pulp, wherein the pulp has a freeness below about 200 ml CSF after 2 to 3 refining steps, wherein the enzymatic activity of the CBH is in a range from 0.5 to 200 FPU per gm of wood chips, based on dry weight measured according to standard T 258 om-06.