D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
92/43, 92/57.3
D21C 7/00 (2006.01) D21B 1/12 (2006.01)
Patent
CA 1114214
Abstract of the disclosure 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 dis- charging 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 heating the chips is conducted in complete counter-current fashion with regard to the chip flow, that is through the feed means, lock feeder, steaming chamber, lock feeder and magazine under normal pressure into free atmosphere, and that the grinding of the chips is carried out at a substantially higher temperature than the heating of the chips.
343494
Marks & Clerk
Yhtyneet Paperitehtaat Oy Jylhavaara
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