D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/2, 92/57.3
D21C 1/00 (2006.01) D21C 9/18 (2006.01)
Patent
CA 1209837
PROCESS FOR INEXPENSIVELY PRODUCING CELLULOSE PULP ABSTRACT OF THE DISCLOSURE A process is provided for inexpensively producing high yield mechanical cellulose pulp having good paper properties, which comprises preheating particulate lignocellulosic material; defibrating the preheated material under a superatmospheric steam pressure within the range from about 2 to about 4.5 bar above atmospheric pressure under conditions such that steam is generated during the defibration; continuing the defibration until a cellulose pulp is obtained having a freeness within the range from about 300 to about 700 ml CSF; flash drying the defibrated cellulose pulp while maintaining a superatmospheric steam pressure within the said range during the drying; withdrawing steam generated during the defibration and passing it in indirect heat exchange with steam utilized in the flash drying, so as to utilize in the drying at least 30% of the heat content thereof; and then removing and baling the flash-dried cellulose pulp.
427387
Ahrel Bo A.
Franzen Torsten A.h.
Henriksson Sven-Erik D.
Svensson Claes G.s.
Macrae & Co.
Modo-Chemetics Ab
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