Patent ID: 8673113
Filing Date: 2014-03-18
Classification: D21B,D21C

Abstract:
1. A process for producing thermomechanical and chemi-thermomechanical pulp comprising: (a) processing a pretreated wood material using a primary high consistency (HC) refining step to produce a first pulp; (b) dividing the first pulp into a primary stream and a secondary stream, each of the primary stream and the secondary stream consisting of the first pulp; (c) processing the secondary stream using a secondary HC refining step to produce a partially refined pulp; (d) treating the primary stream with alkaline-peroxide liquor to produce a treated pulp; (e) combining the partially refined pulp and the treated pulp in a common location prior to removing the latency of the partially refined pulp and the treated pulp; and (f) processing the partially refined pulp and the treated pulp by one or more than one second refining step to produce a second pulp.