Abstract: A filter aid and a method of using the same are disclosed that effectively removes contaminants from water-based metal forming liquids used in aluminum forming, rolling and other metal working processes. The filter aid includes a cellulosic material and a cationic polymer flocculating agent that is mixed with contaminated metal working fluid for a predetermined amount of time. The contaminated metal working fluid is then filtered through the filter aid, thereby removing the substantially all of the contaminants therein and allowing purified metal working fluid to return to the process system without carrying contaminants that will harm the surfaces of the metal being worked and the device that forms them. An acid material may be optionally added to the metal forming liquid, the acid serving to maintain the pressure and flow rate at normal levels by controlling clogging in the filter.

Abstract: A filter aid and a method of using the same are disclosed that effectively removes contaminants from water-based metal forming liquids used in aluminum forming, rolling and other metal working processes. The filter aid includes a cellulosic material and a cationic polymer flocculating agent that is mixed with contaminated metal working fluid for a predetermined amount of time. The contaminated metal working fluid is then filtered through the filter aid, thereby removing the substantially all of the contaminants therein and allowing purified metal working fluid to return to the process system without carrying contaminants that will harm the surfaces of the metal being worked and the device that forms them. An acid material may be optionally added to the metal forming liquid, the acid serving to maintain the pressure and flow rate at normal levels by controlling clogging in the filter.

Abstract: A filter aid and a method of using the same are disclosed that effectively removes contaminants from water-based metal forming liquids used in aluminum forming, rolling and other metal working processes. The filter aid includes a cellulosic material and a cationic polymer flocculating agent that is mixed with contaminated metal working fluid for a predetermined amount of time. The contaminated metal working fluid is then filtered through the filter aid, thereby removing the substantially all of the contaminants therein and allowing purified metal working fluid to return to the process system without carrying contaminants that will harm the surfaces of the metal being worked and the device that forms them. An acid material may be optionally added to the metal forming liquid, the acid serving to maintain the pressure and flow rate at normal levels by controlling clogging in the filter.

Abstract: A filter aid and a method of using the same are disclosed that effectively removes contaminants from water-based metal forming liquids used in aluminum forming, rolling and other metal working processes. The filter aid includes a cellulosic material and a cationic polymer flocculating agent that is mixed with contaminated metal working fluid for a predetermined amount of time. The contaminated metal working fluid is then filtered through the filter aid, thereby removing the substantially all of the contaminants therein and allowing purified metal working fluid to return to the process system without carrying contaminants that will harm the surfaces of the metal being worked and the device that forms them. An acid material may be optionally added to the metal forming liquid, the acid serving to maintain the pressure and flow rate at normal levels by controlling clogging in the filter.

Abstract: A filter aid and a method of using the same are disclosed that effectively removes contaminants from water-based metal forming liquids used in aluminum forming, rolling and other metal working processes. The filter aid includes a cellulosic material and a cationic polymer flocculating agent that is mixed with contaminated metal working fluid for a predetermined amount of time. The contaminated metal working fluid is then filtered through the filter aid, thereby removing the substantially all of the contaminants therein and allowing purified metal working fluid to return to the process system without carrying contaminants that will harm the surfaces of the metal being worked and the device that forms them. An acid material may be optionally added to the metal forming liquid, the acid serving to maintain the pressure and flow rate at normal levels by controlling clogging in the filter.

Abstract: A filter aid and a method of using the same are disclosed that effectively removes contaminants from water-based metal forming liquids used in aluminum forming, rolling and other metal working processes. The filter aid includes a cellulosic material and a cationic polymer flocculating agent that is mixed with contaminated metal working fluid for a predetermined amount of time. The contaminated metal working fluid is then filtered through the filter aid, thereby removing the substantially all of the contaminants therein and allowing purified metal working fluid to return to the process system without carrying contaminants that will harm the surfaces of the metal being worked and the device that forms them. An acid material may be optionally added to the metal forming liquid, the acid serving to maintain the pressure and flow rate at normal levels by controlling clogging in the filter.

Abstract: An apparatus for separating filter cake from an endless filter web, and method for using the same, for use in conjunction with a stacked plate filter system and filter web extractor. The filter cake and filter web separator apparatus includes a downwardly sloping support tray and a wedge-shaped plow blade having a resilient scrapper and suspended above, and generally parallel with, the support tray. As contaminated filter web exits a plate filter and is pulled through the separator apparatus by the filter web extractor, the resilient scrapper dislodges the filter cake from the filter web as the contaminated portion of filter web passes between the plow blade and the support plate and displaces the cake off the filter web where it falls into a suitable collection container. The filter web exits the apparatus from between the plow blade and support tray having substantially all of the filter cake removed from the filter web.

Abstract: An automated computer protocol is disclosed for the dispensing rate of a filter aid slurry into a pressure or vacuum filter in order to efficiently use filter aid and disposable filter septum. The control system accepts three input variables; these variables are total time of filter use, differential pressure across the filter media and the volume (level) in the (slurry or filter aid) bodyfeed tank for augmenting the filter performance. In the disclosed protocol, these variables are processed in turn to vary the rate in which bodyfeed will be introduced into the filter. Specifically, and on an adjustable incremental basis, the pressure differential is monitored across the filter. This differential is compared to that differential which would exist if the filter had reached the end of service life "set point"--which requires septum replacement and cleaning. The total quantity of bodyfeed available and the rate at which bodyfeed is being added to the filter are monitored.

Abstract: A filter aid material and a method for using same in a filtration system for reclaiming and maintaining coolant oil used in aluminum rolling or working processes are disclosed. The filter aid is a fibrous material which is permeated with an acid material and may be provided in either particulate form as a body feed or as a compressed filter pad. As contamined oil flows through the filter aid, the acid acts chemically to remove aluminum fines and oxides as well as the aluminum portion of contaminating soap in the coolant oil. Use of the filter aid with acid greatly reduces the amount of conventional filter aid previously used and produces a relatively small amount of residual filter aid which can be disposed of by incineration.

Abstract: A filter aid material and a method for using same in a filtration system for reclaiming and maintaining coolant oil used in aluminum rolling or working processes are disclosed. The filter aid is a fibrous material which is permeated with an acid material and may be provided in either particulate form as a body feed or as a compressed filter pad. As contaminated oil flows through the filter aid, the acid acts chemically to remove aluminum fines and oxides as well as the aluminum portion of contaminating soap in the coolant oil. Use of the filter aid with acid greatly reduces the amount of conventional filter aid previously used and produces a relatively small amount of residual filter aid which can be disposed of by incineration.

Abstract: A filter includes a lower filter plate mounted to a frame, an upper filter plate movably mounted above the lower filter plate and filter paper between the two plates. A number of shafts are mounted to the frame below the lower filter plate and extend past opposite sides of the filter. Elongate crank arms and eccentrically positioned tie rod connection pins are secured to the ends of the shafts. The upper ends of the tie rods are mounted to opposite sides of the upper filter plate. The tie rods' lower ends are pivotally mounted to the tie rod connections for eccentric movement about the axes of the shafts. A pneumatic ram is used to rotate one of the shafts through an actuator arm keyed to the shaft. The outer ends of the crank arms on each side are coupled together by connecting bars so the crank arms move in unison. A locking arm is mounted to one of the shafts and is positioned to engage locking recesses in upper and lower locking dogs when the upper filter plate is fully opened and fully closed.

Abstract: A system for filtering liquids, such as coolant liquid from process machinery. The system includes an improved liquid storage tank having a partition dividing the tank into a clean tank for receiving clean liquid from a filter for return to the process machinery, and a dirty tank for receiving process or dirty liquid from process machinery. The storage tank further includes a second partition forming a blowdown chamber and a recirculation chamber below the blowdown chamber, the two chambers being coupled together by a valve which can be opened and closed depending upon the cycle of operation of the system. The recirculation chamber is coupled by a filter pump to the inlet of the filter. The filter has a return line to the clean tank and a blowdown line to the blowdown chamber. The blowdown chamber has a conical bottom and the recirculation chamber has a sidewall provided with tangential inlet ports communicating with the dirty tank.

Abstract: An improved filter plate of the type used with a vertical stack of other such plates to form an industrial filter of the type known as a horizontal plate filter. The improved filter plate has a generally upright side wall, and a divider plate or transverse planar plate portion secured to the side wall below the upper margin thereof. An open top trough is formed in the divider plate to receive the filtrate passing through a filter medium above the filter plate when the latter forms a part of a horizontal plate filter. A hole in the side wall permits the filtrate to be removed from the trough. The filter plate further includes a fluid inlet conduit and an air vent/blowdown conduit extending through the side wall into the space below the divider plate. The trough and removable conduits eliminate the need for fixed baffles for use as the fluid inlet, outlet, and blowdown means as found in a conventional filter plate.

Abstract: Disclosed is an improved liquid filter in which contaminated liquid is pumped into an inlet chamber, through a filter element, into an outlet chamber and out of the filter through an outlet pipe. The inlet and outlet chambers have compartments which hold compressed air. When the filter element becomes clogged with contaminants, inlet and outlet valves are closed, sealing off the filter. A vent valve is then opened to quickly exhaust the compressed air in the inlet air compartment. This allows the compressed air in the outlet air compartment to energetically force liquid back through the filter element thereby dislodging the deposited contaminants. The compartments and a liquid column between them are sized so that a discharge of liquid from the inlet compartment during the venting thereof is prevented.

Abstract: A filter apparatus wherein filter media is submerged in liquid being filtered and suction is employed under the media to increase the flow through it. The filter media in elongated strip form is supported for movement in one direction on an inclined endless pervious conveyor comprised of rigid plate members fixed to a pair of drive chains. A receiving tank for dirty liquid is above the conveyor and media with a lower tank for clean liquid below the conveyor with the sides and ends of the lower tank being constantly sealed in order to maintain reduced pressure therein to enhance flow through the media. Filtered liquid at a somewhat higher pressure is supplied at the sides of the conveyor and at end walls of the receiving tank to prevent any migration of dirty liquid into the lower tank at the periphery of the lower tank.

Abstract: Disclosed is an improved filter of the type comprised of a series of stacked plate assemblies forming filter chambers adjacent to sheets of filter media between plate assemblies. The plate assemblies are constructed so that liquid can be rapidly removed from the filter chambers to prevent spillage when it becomes necessary to separate the plate assemblies and replace the filter media. Each plate assembly has an internal baffle system along one side having inlets for liquid to be filtered. The baffle system for each plate assembly deflects liquid coming into the chamber so as to prevent it from disturbing the filter cake, and it also allows substantially all of the liquid to be blown out of the chamber during a reverse flow "blow-down" procedure prior to separation of the plate assemblies.

Abstract: A method and a kit for testing the biocide concentration of a liquid containing a biocide of the type which breaks down in acidic aqueous solution to liberate formaldehyde. A strong aqueous acid is added to the liquid, and a modified Schiff's reagent is also added. Time is given for color to develop, and then the color intensity of the solution is read. In instances where oil-water emulsions or latices are involved, the emulsion is broken before adding the Schiff's reagent.