Abstract:
An apparatus and method is disclosed for removing fluid from a fibrous web (W). The apparatus (10) includes a press member (12) and a blanket (14) which cooperates with the press member (12) for defining therebetween an elongate pressing section (16) such that the web (W) is pressed between the press member (12) and the blanket (14) during passage through the pressing section (16). An elongate shoe (18) urges the blanket (14) towards the press member (12) such that when the web (W) passes through the pressing section (16), fluid is removed from the web (W). A heater (22) is disposed adjacent to the press member (12) for transferring heat to the web (W) such that when the web (W) passes through the press section (16), the web (W) is subjected for an extended period to increased pressure and temperature so that water vapor generated within the pressing section (16) during passage through the pressing section (16) forces the fluid in the liquid phase away from the web. The press member (12) defines a pressing surface (24) which is porous so that delamination of the web is inhibited.
Abstract:
A paper pulp processing mechanism and method for screening large flows of wood chips including a screening bed for receiving a delivery of a quantity of wood chips at a screening receiving station (14), the flow of chips dividing to flow laterally in one direction over a first lateral bed section (15) extending laterally and upwardly and to also flow over a second lateral bed section extending laterally and upwardly with each section extending away from the receiving station to a delivery end and each path defined by a plurality of laterally extending rotatable shafts (28) having disks thereon interdigitally related.
Abstract:
A single tier drying section for drying a web. The drying section includes a dryer (16) and a felt (72) guided about the dryer such that the web is disposed between the dryer and the felt for drying a first side (18) of the web. A further dryer (22) is disposed downstream relative to the dryer and a further felt (110) is guided about the further dryer such that the web is disposed between the further dryer and the further felt for drying a second side (24) of the web. A dryer transfer mechanism is used for transferring the web from the dryer to the further dryer.
Abstract:
A forming apparatus (10) for forming a web from stock. The apparatus (10) includes a frame (14) and a first and second plurality of guide rolls (16-26 and 30-34) rotatably connected to the frame (14). A first and second forming wire (28, 36) extend respectively around the first and second plurality of guide rolls. With the first and second wires (28, 36) cooperating together to define therebetween, a forming section (38) having a first and second (40, 42) end. A headbox (12) is disposed adjacent to the first end (40) of the forming section (38). A suction shoe (44) is disposed adjacent to the first end (40) of the forming section for effecting an initial dewatering of the web. The suction shoe (44) has a curved surface (46) which abuts against the first wire (28) for removing a first portion of the water through the first wire (28) and a second portion of the water through the second wire (36). A vacuum slot (52) collects the second portion of water and a roll (17) is disposed between the vacuum slot (52) and the second end (42) of the forming section (38) for removing a third portion of the water from the formed web thereby resulting in a gradual increase in dewatering from the first to the second end of the forming section (38) thereby minimizing removal of fines from the stock and inhibiting two-sidedness of the resultant web.
Abstract:
A vacuum device (15, 15') and method for avoiding sheet flutter in an on-running tangent pocket (14, 14') defined between the perimeter of a dryer roll (9, 9'), and a free transitional span (13, 13') of a dryer felt (7, 7') travelling toward the dryer roll and carrying a wet paper sheet web (8, 8') on the face of the felt outside of the tangent pocket. The device comprises an elongate hollow manifold (17, 17') arranged to extend longitudinally within the pocket (14, 14') parallel to the felt (7, 7') and web (8, 8'). The air in the pocket (14, 14') is vacuumed into a chamber (16, 16') within the manifold (17, 17') through an arrangement of ports (21, 21', 22, 22') communicating with the vacuum chamber. A suction member (20, 20') draws the air from the vacuum chamber (16, 16') and communicates with a vacuum source (34).
Abstract:
A paper stock refiner provides low intensity treatment of pulp fiber to increase the strength characteristics of the pulp while reducing the specific energy required through increasing the number of refining surfaces. The number of refining surfaces is accomplished by providing a plurality of rotatable (30) and non-rotatable (36) refiner disks which are axially movable within a refiner, the rotatable disks being mounted on a torque transmitting section (28) of a shaft (26) and the non-rotatable disks being mounted against rotation on a plurality of supporting elements (44). In order to control the number of refiner bar crossings, the housing (12) may be opened and a desired number of refiner disks, both rotating and non-rotating, may be loaded into the refining chamber (16) on the shaft and the support elements, respectively.
Abstract:
A control valve (22) for controlling both the flow of steam (S) from a steam header (18) and air (A) into a steam box (12) of a web drying machine. The control valve (22) includes a valve body (26) defining a longitudinal passageway (28). The passageway (28) has a first and a second end (30, 32) with the first end (30) of the passageway (28) being connected to, and in fluid communication with, the steam header (18). The second end (32) is connected to and in fluid communication with an air header (19). A first and a second valve seat (34, 36) are disposed adjacent to the first and the second ends (30, 32) of the passageway (28) for controlling respectively the flow of steam (S) and air (A) into the steam box (12). An elongate valve stem (38) having a first and a second valve closure (44, 46) is movable axially within and along the passageway (28), the first and second closures (44, 46) being disposed adjacent to a first and second end (40, 42) of the valve stem (38). A stepping motor (48) is drivingly connected to the valve stem (38) for selectively moving the valve stem (38) axially relative to the passageway (28) such that when the valve stem (38) is moved, the change in flow of steam (S) into the steam box (12) is inversely proportional to the change in flow of air (A) through the second valve seat (36).