초록 ▼

Process and apparatus are provided for continuously conveying particulate compressible fibrous material from a first zone at a first gas pressure to a second zone at a second gas pressure with a pressure differential therebetween of at least 0.5 bar while retaining the prevailing gas pressure in eac

Process and apparatus are provided for continuously conveying particulate compressible fibrous material from a first zone at a first gas pressure to a second zone at a second gas pressure with a pressure differential therebetween of at least 0.5 bar while retaining the prevailing gas pressure in each zone, which comprises: (1) continuously compressing the particulate material in the first zone into a gas-containing but gas-impermeable mass extending across the interface between the two zones; (2) continuously passing the mass of material out from the first zone into the second zone while maintaining the gas pressure within the mass constant at the gas pressure of the first zone; and (3) continuously breaking up the mass entering the second zone into particulate material.

대표청구항 ▼

A process for continuously conveying particulate compressible fibrous cellulose pulp material having a solids content between 30 and 90% and a density within the range from about 10 to about 150 kg/m3 from a first zone at a first gas pressure to a second zone at a second gas pressure with a pressure

A process for continuously conveying particulate compressible fibrous cellulose pulp material having a solids content between 30 and 90% and a density within the range from about 10 to about 150 kg/m3 from a first zone at a first gas pressure to a second zone at a second gas pressure with a pressure differential therebetween of at least 0.5 bar while retaining the prevailing gas pressure in each zone, which comprises: (1) continuously compressing the particulate material in the first zone into a gas-containing but gas-impermeable resilient mass of low density extending across the interface between the two zones; (2) continuously passing the mass of material out from the first zone into the second zone at a flow rate within the range from about 0.5 to about 8 kg of pulp per second while maintaining the gas pressure in the mass constant at the gas pressure of the first zone; and (3) continuously breaking up the mass entering the second zone into particulate material; substantially without impairing the quality of the pulp fibers. An apparatus for continuously conveying particulate compressible fibrous cellulose pulp material having a solids content between 0 and 90% and a density within the range from about 10 to about 150 kg/m3 from a first zone at a first gas pressure to a second zone at a second gas pressure with a pressure differential therebetween of at least 0.5 bar while retaining the prevailing gas pressure in each zone, and substantially without impairing the quality of the pulp fibers, which comprises: (1) screw conveyor means for continuously compressing the particulate material in the first zone into a gas-containing but gas-impermeable resilient mass of low density extending across the interface between the two zones; and for continuously passing the mass of cellulose pulp material out from the first zone into the second zone while maintaining the gas pressure in the mass constant at the gas pressure of the first zone constant; the screw conveyor comprising a conveyor housing extending across an interface between the two zones; a conveyor passage through the housing having an inlet in the first zone and an outlet in the second zone; the passage having a portion of larger diameter adjacent the inlet and a portion of lower diameter adjacent the outlet, and a tapered portion connecting the inlet and outlet portions; a helical screw arranged for rotation in the passage and having an outer periphery extending through the passage portions spaced at a distance of from 2 to 5 mm from the housing wall with a correspondingly larger diameter in the inlet portion than the outlet portion for conveying cellulose pulp material along the passage from the inlet towards the outlet; (2) means for continuously breaking up the mass entering the second zone into particulate material; comprising a rotatable restraining device movable between positions across and closing off the outlet and spaced from the outlet sufficiently to allow material conveyed by the screw to be discharged through the outlet; and having a substantially planar surface facing and contacting and arranged to seal against the mass of cellulose pulp material at the discharge opening and apply pressure to the mass sufficient to cause the mass to seal against both the walls of the conveyor passage and the planar surface of the restraining device while it is being discharged from the outlet; and (3) disintegrating means operatively connected with the restraining device for rotation therewith for breaking up the mass of cellulose pulp material; whereby gas entrained in the mass is maintained therewithin substantially without loss and at substantially the same pressure as the gas pressure in the first zone until it is released in break-up of the mass of cellulose pulp material by the disintegrating means.