发明名称 |
Methods for producing high-freeness pulp |
摘要 |
Methods of producing mechanical pulps from lignocellulosic material including partial defibration of lignocellulosic material in a chip press followed by liquid impregnation, preheating the lignocellulosic material for 20 seconds or less at a pressure between 7.5 and 12 bar (gauge) prior to mechanically refining the lignocellulosic material in a primary mechanical refiner at a pressure between 7.5 and 12 bar (gauge), thus obtaining a high freeness pulp. |
申请公布号 |
US8753476(B2) |
申请公布日期 |
2014.06.17 |
申请号 |
US201113239756 |
申请日期 |
2011.09.22 |
申请人 |
Andritz Technology and Asset Management GmbH |
发明人 |
Sabourin Marc |
分类号 |
D21B1/12;D21B1/26 |
主分类号 |
D21B1/12 |
代理机构 |
Nixon & Vanderhye PC |
代理人 |
Nixon & Vanderhye PC |
主权项 |
1. A method of producing a mechanical pulp from lignocellulosic material in a pulping system comprising
a pretreatment subsystem comprising a pressure separated feeding device, a high compression device, and an impregnator, and a production subsystem comprising a variable speed pressurized conveyor and a primary mechanical refiner, the method comprising the following steps: providing lignocellulosic material to the pressure separated feeding device and then transferring the lignocellulosic material to the high compression device; wherein the step of destructuring the lignocellulosic material in the high compression device results in a destructured lignocellulosic material in which over 50% of the destructured lignocellulosic material by weight passes through a 16 mm screen perforation; transferring the lignocellulosic material from the high compression device to the impregnator and impregnating the lignocellulosic material; transferring the lignocellulosic material to the variable speed pressurized conveyor, wherein a residence time of the lignocellulosic material in the variable speed pressurized conveyor is 20 seconds, and wherein the variable speed pressurized conveyor operates at a pressure between 7.5 and 12 bar (gauge) and preheats the lignocellulosic material with steam; transferring the lignocellulosic material to the primary mechanical refiner; and mechanically refining the lignocellulosic material in the primary mechanical refiner at a pressure between 7.5 and 12 bar (gauge) to obtain a high freeness pulp.
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地址 |
Graz AT |