Abstract:
A sealing arrangement for a shutter for a feeding chamber of a continuously operating pressure grinder. The feeding chamber is provided with an inlet opening for feeding wood batches at atmospheric pressure into said feeding chamber and with an outlet opening for feeding said wood batches into the grinding chamber at overpressure. Each opening of said feeding chamber is provided with a shutter movable between an opened position and a closed position for preventing of escape of said overpressure through said feeding chamber. The feeding chamber is provided with a fixed guide supporting the shutter during its movement between opened and closed positions. Said guide comprises two parallel support surfaces between which the shutter is slidably mounted. The distance between said support surfaces is greater than the thickness of the shutter adjacent said support surfaces so that the shutter is displaceable towards and away from said support surfaces in a direction perpendicular to said support surfaces. A sealing element is provided in one of said support surfaces in such a way that, when the shutter is displaced away from said one support surface towards the other support surface, the shutter is released from contact with said sealing element. In this way the shutter is due to the pressure difference between opposite sides of the shutter pressed against said one support surface and against said sealing element but is released from contact with said support surface and said sealing element when the pressures are equilized on opposite sides of the shutter and can be moved to open and closed positions without said contact.
Abstract:
REACTIONS IN THE RANGE OF ABOUT 25* TO 40*C.; REMOVING CARBONATED SOLUTION FROM THE TOWER. 1. A METHOD FOR THE CARBONATION OF SULPHIDE-CONTAINING GREEN LIQUOR SOLUTIONS OBTAINED FROM THE RECOVERY SYSTEMS OF PULP MILLS USING SODIUM BASE DIGESTION COMPRISING PASSING GREEN LIQUOR SOLUTION THROUGH AN ABSORPTION TOWER COUNTER-CURRENTLY TO A FLOW OF CARBONATION GAS CONTAINING AT LEAST TWICE THE AMOUNT OF CARBON DIOXIDE THAT THE GREEN LIQUOR IS CAPABLE OF ABSORBING FEEDING SAID CARBONATION GAS INTO A LOWER PORTION OF SAID TOWER PACKED WITH CONTACT SURFACE INCREASING PACKING, CONTACTING SAID CARBONATION GAS WITH SAID GREEN LIQUOR IN SAID LOWER PORTION, SAID AMOUNT OF GAS BEING SUFFICIENT TO CONVERT THE SULPHITE CONTENT OF SAID SOLUTION TO BISULPHIDE, CARBONATE AND BICARBONATE WHILE LIBERATING A MINOR PORTION ONLY OF SAID SULPHIDE CONTENT AS HYDROGEN SULPHIDE ALLOWING UNABSORBED CARBON DIOXIDE AND SAID LIBERATED HYDROGEN SULPHIDE TO PASS UPWARD INTO AN UNPACKED UPPER PORTION OF SAID TOWER, SPRAYING FURTHER FRESH GREEN LIQUOR SOLUTION FROM ABOVE SO THAT FINE DROPLETS OF GREEN LIQUOR SOLUTION CONTACT THE GASES RISING IN THE UNPACKED UPPER TOWER PORTION, SELECTIVELY REABSORBING SUBSTANTIALLY ALL OF SAID HYDROGEN SULPHIDE IN SAID FRESH GREEN LIQUOR SOLUTION AS BISULPHIDE; MAINTAINING A TEMPERATURE FAVOURABLE TO THE
Abstract:
In a paper machine a paper web is conducted by a continuous felt or the like into the press nip between two rolls. One roll is a suction roll and the other roll is a pressure roll having a single pressure opening located opposite to the suction opening of the suction roll such that it does not encompass the nip between the two rolls. From the pressure opening of the pressure roll a gas, preferably heated, is conducted into the space between the rolls most appropriately before the press nip. A blocking member such as a beam with a triangular cross section may be positioned on the incoming side of the rolls to form a confined space between it and the rolls to prevent escape of the warmed, pressurized gas.
Abstract:
This disclosure relates to a light mortar for fin-stabilized projectiles comprising a mortar barrel defined by upper and lower tubes, means for pivotally mounting the upper and lower tubes relative to each other about an axis transverse to the axis of the mortar barrel, linkage means disposed between the upper and lower tubes for imparting a relative force therebetween to pivotally move the upper and lower tubes relative to each other about the pivotal mounting means between a coaxially aligned firing position and a position of misalignment of the tube axes, a pair of support columns between the upper and lower tubes with the pivotal mounting means being in spanning relationship between the support columns, the linkage means also being disposed between the support columns and including a toggle system having bell crank means for imparting the relative force to pivotally move the upper tube relative to the lower tube, and a half-shell supported by the support columns adjacent an upper end of the lower tube with means for locking a lower end of the upper tube to the latter-mentioned half-shell.