70 u00b0 sr the energy demand amounts to 1 850 kwh t which signifies a saving of 25 in comparison to a standard ctmp the yield is 96 the fiber has the following technical qualities at 70 u00b0 sr ______________________________________breaking length 4 070 mtear propagation strength brecht imset 1 23 j mspecific volume 2 22 cm sup 3 glight scattering coefficient per scan c27 69 46 7 m sup 2 kg______________________________________ a wood pulp defibered in the refiner without pretreatment to a fineness of 15 u00b0 sr is treated for 10 minutes at 100 u00b0 c with the methanol water sulfur dioxide liquor described in example 1 and then additionally ground in a jokro mill under standard conditions to achieve a fineness of 70 u00b0 sr 6 750 revolutions were needed the untreated reference pulp required 15 750 revolutions to achieve a fineness of 63 u00b0 sr spruce wood chips are treated at 600 u00b0 c for 60 minutes with a methanol water mixture of 30 70 vol containing 50 g l of sulfur dioxide after the treatment the methanol and the unconsumed sulfur dioxide are recovered and the chips are defibered in a refiner 1 390 kwh t are required for the achievement of a fineness of 77.