Procedure and means for preparing thermogroundwood

Abstract From the Canadian patent

Procedure for preparing thermogroundwood from wood chips wherein, the chip flow is conducted from a storage magazine under normal pressure through a lock feeder into a pressurized steaming chamber where the chips stay for a few minutes and are heated to optimum temperature 100 to 125 Centigrade, and from the steaming chamber through a lock feeder to a feed means which supplies the chips into a hot grinder of enclosed design. In the procedure the steam discharging from the throat of the grinder against the chip flow is utilised towards heating the chips in the steaming chamber and, the steam separated from the groundwood is to the purpose of its utilization conducted. The steam utilized for …