Abstract:
The apparatus is a washer, thickener and classifier for recovering solids from liquids including a truncated conical screen with walls typically sixty degrees from the horizontal and formed of filter media. Stock sprayer assemblies rotate about a longitudinal axis of said conical screen and direct stock, particularly deink paper stock, onto the walls of the conical screen. Wash fluid sprayer assemblies, including high impact shower nozzles, direct wash fluid onto the stock on the walls of the conical screen. The wash fluid cleans the stock, with the unwanted solids and contaminants passing through the conical screen to the discharge pipes. The wash fluid similarly washes the cleaned stock through the exit formed at the truncated portion formed at the apex of the conical screen for subsequent processing.
Abstract:
A drainage device and method which provides for drainage from paper or pulp stock on a fabric (10) in a sheet- or mat-making machine which includes a primary blade (26) and trail blade (28) with a gap (24) therebetween for drainage wherein the size of the gap (24) controls drainage and the primary blade (26) is so configured so as to force a portion of the drained liquid through the fabric to create paper stock activity and disbursement while minimizing turbulence and maintaining laminar flow of the machine direction along with providing reinforcement of CD shear.
Abstract:
An improved strainer device has a screen (24) which receives a solid/mixture from a feed container (16) for separation. To insure that an uneven flow of the mixture over the screen (24) does not occur due to, for example, a non-level mounting, inlet rushing or turbulance, a weir structure (80) is provided which raises the water mixture level above the screen (24) by a predetermined height.
Abstract:
The linear traversing apparatus (10) includes a lead screw (12) formed from a plurality of lead screw segments (14, 16, 18) which are supported at regular intervals, that is, at the intersection of adjacent lead screw segments, along a span by fixed hollow cylindrical splice points (20, 22). The lead screw segments (14, 16, 18) include external threading which engages the internal threading of a C-shaped spanning nut (28). The C-shaped spanning nut (28) has a circumferential portion removed so that the spanning nut (28) can clear the fixed hollow cylindrical splice points (20, 22) and associated support structure (24, 26) as the spanning nut (28) traverses the lead screw (12) in response to the rotation of the lead screw (12) and the inhibition of rotation of the spanning nut (28). The rotation of the spanning nut (28) is inhibited typically by mechanical communication with an instrument or other device which is engaged by a rail or a slot parallel to the longitudinal axis of rotation of the lead screw (12).
Abstract:
The apparatus (10) of the present invention is a papermaking machine with a forming fabric (12) in a looped configuration. The forming fabric (12) carries paper stock (100) through the papermaking process. The forming fabric (12) passes over a liquid-filled cavity (20) which is bounded on its lower surface by a flexible non-permeable membrane (14). A roll (22) with regular protrusions (24) underneath the membrane (14) is rotated to vertically excite the membrane (14), the liquid-filled cavity (20), and, subsequently, the paper stock (100) in order to disperse the paper stock (100) into a random orientation.
Abstract:
A method and apparatus for cleaning dryer fabrics (36) comprising an ultra high pressure water jet (14) or jets (14) at reduced water volume.
Abstract:
The apparatus is a three ported valve assembly with a first port (16) in communication with a vacuum source, a second port (14) in communication with a process vacuum, and a third port (20) in selective communication between atmosphere and the process vacuum. Communication between the first and second ports is regulated by the position of a piston (24). Moreover, when the piston reaches its lowermost position, the third port is opened to provide communication between atmosphere and the process vacuum. The position of the piston is changed by rotation of a rotary air motor (68) which, by way of a rotating beveled pinion gear (58) which meshes with two symmetrically opposed beveled idler gears (53, 54) which are journaled for rotation on a threaded trunion and which further mesh with a stationary beveled pinion gear (44), rotates the threaded trunion to raise or lower a threaded rod (40) which is coupled to the piston.
Abstract:
The apparatus (10) is an oscillator for a showerhead (31) to keep the forming fabric of a papermaking machine clean and open. A hydraulic cylinder (12) is formed with a piston cup assembly (32) dividing the cylinder into first and second fluid chambers (36, 38). The piston cup assembly is coupled to a magnet (30) and a driveshaft (24), the driveshaft being coupled, in turn, to the showerhead to be oscillated. A four-way valve (48) is used to direct fluid from a pressurized external source alternately into the first and second fluid chambers thereby causing reciprocation of the driveshaft. The position of the magnet, and hence the driveshaft and showerhead, is monitored by a transducer (44) which sends position and rate signals to a microprocessor-based controller (46). The microprocessor-based controller sends a signal to the four-way valve to direct which of the first and second fluid chambers receives fluid from the pressurized source in order to achieve the desired parameters of reciprocation. Additionally, the microprocessor-based controller provides an alarm signal should the driveshaft rate drop below a preset value.
Abstract:
A suction pipe assembly (10) for dewatering a web in a papermaking machine includes a rotating pipe supporting suction cover (38) and attached to a frame (12) by a bearing sleeve (52). Support members (54, 56 and 58) extend from the bearing sleeve (52) to the pipe without obstructing the flow of air through the pipe.