Abstract: A method for separating fluid and fibrous lost circulation material from a mixture thereof that also includes drilled cuttings, the method including introducing the mixture onto a screen assembly that is vibrating for passage of the fluid and fibrous lost circulation material through the screen assembly and for separation of the driled cuttings from the fluid, the screen assembly with a plurality of screens one on top of the other and including at least a first screen and a second screen, one of the screens with a screen mesh with non-square openings as viewed from above to facilitate the passage of fibrous lost circulation material through the screen assembly.

Abstract: A screen assembly for a vibratory separator has been invented, which, in certain aspects, has a ridge-valley series of undulating screening material with a plurality of alternating ridges and valleys of screening material, each of said ridges having two spaced-apart ridge ends, a ridge top and a ridge bottom, and each ridge end with a portion of screening material that tapers down from its corresponding ridge's ridge top to a level of screening material at its corresponding ridge's ridge bottom.

Abstract: A screen includes two or three layers of woven metal screen cloth. The coarsest of these layers includes threads which are woven into the cloth with surfaces which are fusible below a temperature at which the other layers of screen cloth are heat effected. These woven threads may include each of the threads in the coarse screen cloth with the coated threads being wire with fusible polypropylene or polyethylene coatings. The coarse screen cloth may include a woven metal screen with woven elements which are either coated with fusible material or are solidly of fusible material woven periodically therethrough in at least one direction. Screens are laminated with one or two fine mesh screens heated on the woven screen cloth with fusible surfaces to locate the fusible material in the finer cloths.

Abstract: A screen assembly has been invented which has a base, at least one layer of screening material on the base, and at least one ramp formed in the at least one layer of screening material.

Abstract: A screen assembly which, in at least certain aspects, has at least one wire mesh screen formed with undulating mesh material having a series of ridges spaced apart by a series of valleys, a corrugated perforated plate with an undulating shape corresponding to the undulating mesh material of the at least one wire mesh screen, the at least one wire mesh screen on the corrugated perforated plate, a series of spaced apart rods all of which are in one plane, the corrugated perforated plate mounted on the rods of the series of spaced apart rods, and each rod having a length and independent of and not connected to the other rods along its length by any member in the same plane as the rods, each rod having two spaced apart ends.

Abstract: A method for separating fluid from a mixture of fluid and fibrous lost circulation material, the method including introducing the mixture onto a screen assembly that is vibrating for passage of the fluid through the screen assembly and for separation of fibrous lost circulation material from the fluid, the screen assembly comprising a plurality of screens one on top of the other and including at least a first screen and a second screen, one of the screens with comprising a screen mesh woven with non-square openings as viewed from above.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

Abstract: A method for separating fluid from a mixture of fluid and fibrous lost circulation material, the method including introducing the mixture onto a screen assembly that is vibrating for passage of the fluid through the screen assembly and for separation of fibrous lost circulation material from the fluid, the screen assembly comprising a plurality of screens one on top of the other and including at least a first screen and a second screen, one of the screens with comprising a screen mesh woven with non-square openings as viewed from above.

Abstract: A vibrating screen assembly of dissimilar materials. A frame is composed of a first material having a coefficient of thermal expansion. At least one screen cloth is composed of a second material. A ratio of the coefficient of thermal expansion first material to the coefficient of thermal expansion of the second material is greater than one.

Abstract: A screen assembly for a vibratory separator has been invented, which, in certain aspects, has at least two ridge-valley series of screening material with a plurality of alternating ridges and valleys of screening material, and at least one ridge-valley series of screening material offset from at least one other ridge-valley series of screening material. A screen assembly for a vibratory separator has been invented, which, in certain aspects, has at least one ridge-valley series of screening material, said ridge-valley series including a plurality of ridges each ridge between valleys of a plurality of valleys, and each ridge having a first end spaced apart from a second end, said first end having a top wider than a top of second end.

Abstract: A screen assembly for a vibratory separator has been invented, which, in certain aspects, has at least two ridge-valley series of screening material with a plurality of alternating ridges and valleys of screening material, and at least one flat area of screening material adjacent at least one of the ridge-valley series.

Abstract: An assembly has been invented for a vibratory shaker for screening material flowing thereto, which according to certain aspects of the present invention has a panel with a plurality of spaced-apart holes therethrough, a plurality of strips spaced-apart thereon and defined by the plurality of holes, the strips in a first plane, a plurality of crossmembers each of which has two ends, one end connected to one of the strips and the other end connected to another strip, the crossmembers in a plane different from that of the first plane. In embodiments of a screen assembly according to the present invention, there is screening material on such a panel.

Abstract: A screen for a vibratory separator for screening fluid with material entrained therein introduced on the screen, the screen having, in certain aspects, a plurality of warp wires and a plurality of shute wires, the warp wires interwoven with the shute wires, the plurality of warp wires including a plurality of first warp wires and a plurality of spaced-apart support wires, the support wires having a diameter greater than a diameter of the warp wires. In another aspect, a screen for a vibratory separator for screening fluid with material entrained therein introduced on the screen, the screen having a plurality of warp wires and a plurality of shute wires, the warp wires interwoven with the shute wires, the plurality of shute wires including a plurality of first shute wires and a plurality of spaced-apart support wires, the support wires having a diameter greater than a diameter of the first shute wires.

Abstract: A screen for a vibratory shaker for treating material flowing thereto, the screen in certain aspects having a lower support made of criss-crossed wires which define a plurality of spaced-apart holes through the lower support, the wires having top surfaces with a substantially flat portion, and screening material on the top surfaces of the wires.

Abstract: A screen having a frame, three screen cloth layers and a laminating solidified layer with perforations therethrough. The screening layer of the screen cloth is typically of the finest mesh with increasing coarseness to the support mesh. The solidified layer is positioned by placement on the supporting mesh where it is fused to impregnate through each of the screen layers to form surfaces on either side of the lamination. A heat press is employed to so configure the solidified layer. A nonstick sheet between the screening mesh and the heat press molds texture into the surface of the solidified layer for reduced slippage of material being screened on the assembly. The screen lamination is stretched and bonded to a screen frame.

Abstract: The invention relates to a sieve frame for plan sifters and also to a method of producing it. It is used mainly in plan sifters for milling. The object is to improve the functionality of an insertable sieve frame and to simplify production.

Abstract: A new screen has been invented for use with vibratory screening apparatuses which has, in certain aspects, a base, a first screen on the base, and a scalping screen on the first screen, the first screen assembly including a corrugated screen having alternating crests and valleys, and the second screen assembly secured to the crests of the corrugated screen, and cushion members disposed between the first and second screen assemblies, the corrugated screen of the first screen assembly having first end openings beneath valleys on two sides thereof, and end plugs within the first end openings to sealingly close off the end openings to fluid flow. The present invention has other embodiments disclosed herein from. A screening apparatus or shale shaker and methods of their use have been invented that use such screens.

Abstract: A screening screen having openings in the warp direction which are longer than these openings in the woof direction including warp wires and woof wires of the same maximum size extending at substantially maximum warp and woof crimp angles relative to each other which will not permit the warp wires and the woof wires to slide relative to each other. A method of fabricating a screening screen of the above type including the steps of determining the size of the openings in the woof direction and determining the maximum wire size of the warp and woof wires which will produce a maximum woof crimp angle which will not permit the woof wires to slide relative to the warp wires in the woof direction, and determining the length of the openings in the warp direction which will produce a substantially maximum warp crimp angle which will not permit the warp wires to slide relative to the woof wires in the warp direction.

Abstract: A new type of non-tensioned shaker filter for a shaker machine. The shaker filter is comprised of layers of wire cloth that are bonded together without a rigid backing and are corrugated. Left and right side edges are provided on the left and right sides of the filter, respectively, in order to protect the user from injury from sharp edges and to seal the filter to ledge provided on a non-tensioned means for securing the filter to the shaker. Front and back edges of the filter are provided with front and back lips respectively on a bottom side of the filter in order to protect the user from injury from sharp edges and to seal the filter to the non-tensioned means for securing the filter to the shaker.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

Abstract: A substantially planar screen for a solid particle separator is formed from one or more layers of mesh. The one or more layers of mesh are formed into a series of ridges separated by channels within the plane of the screen. The wire mesh is bonded to a rigid or semi-rigid panel having a plurality of relatively large openings as compared to those of the mesh to create a plurality of repairable screen cells. The support panel is formed with or bent into a series of alternating ridges and channels to create the ridges and channels in the wire mesh when it is bonded to the panel. The cross-sectional shape of the ridges are generally triangular to maximize exposure of surface area of the screen to a flow of material to be separated. Flat surfaces on the ridges and in the channels facilitate repair of screen cells with solid plugs.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate having side edge portions with first apertured bands extending between the side edge portions and second unapertured bands alternating with the first bands, the second bands having a wider width than the borders between the apertures in the first band, and an undulating screening screen having ridges and troughs between the ridges extending crosswise to the first and second plate bands and being secured thereto.

Abstract: Described is a screening device (1) with a screen fabric (2) having two groups of threads, the threads of one group running substantially orthagonal to the threads of the other group. A screening device of this kind can be more easily monitored to detect breaks in the screen fabric. For this purpose, electrically or optically conductive threads are provided in the second group at a predetermined lateral distance from one another. The threads of the second group are mechanically supported by the threads of the first group and are insulated relative to one another at least in some portions electrically or optically with respect to the physical quantity. An input arrangement and output arrangement (6, 7) is provided, respectively, at two edges of the screen fabric (2) which extend substantially parallel to the threads of the first group, this input arrangement and output arrangement (6, 7) being connected at least with the conductive threads of the second group in a conducting manner.

Abstract: A screen for a vibratory shaker having a frame with multiple openings. Screen modules or plugs are disposed in each opening. Further disclosed is a mounting apparatus for securing the screen plugs in the openings and a support strip for supporting part of a screen having at least one upturned finger projecting above the top surface of the support body configured for contacting and supporting at least a part of a raised portion of the frame. A plug or module disposed in an opening of a positioning member of a screen assembly for a vibratory separator receives fluid with material therein for separation therefrom. Additionally disclosed is a method for making a plate mesh combination.

Abstract: A screen is disclosed which, in certain aspects, has screening material between opposed frame sides and one or more lower strips beneath the screen. In one aspect a plurality of lower strips are bonded to the screen and extend across the screen from one frame side to the other. In one aspect one or more of the strips has one, two, or more humps or ridges corresponding to one or more corrugations in a corrugated perforated plate and/or corrugated screen assembly which is on the plate or, with no plate present, on the strips. In another aspect instead of the strips a solid corrugated perforated plate is used. In one aspect openings or perforations through the plate are triangular. In one aspect the screen is undulating screening material and lower portions of the screening material are bonded to a plate or to strips. Optionally screen mounting hooks or frame edges or screen edges may be used with such screens. A screening apparatus or shale shaker is disclosed which uses such plates and screens.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

Abstract: A vibratory screen system including a screen assembly having screen cloth on both the top and the bottom of the frame. The screen cloth on the bottom has openings larger than and up to five times the size of the openings on the upper screen cloth. A pattern of dividers divide the screen into compartments. The screens are bonded to the frame and to the pattern of dividers.

Abstract: A screen assembly for a vibratory screening machine including a frame in the nature of a plate having spaced apertures therein, spaced frame members on opposite sides of the apertures, a screen formed in an undulating shape having substantially parallel ridges with downwardly sloping sides, troughs formed between the downwardly sloping sides for conducting material which is being screened, undersides on the troughs, bonds for securing the undersides of the troughs to the spaced frame members which are located on opposite sides of the apertures, and channels at the sides of the plate for securing the frame to a vibratory screening machine.

Abstract: A woven wire screen cloth having a plurality of parallel warp filaments intersected by a plurality of parallel shute filaments configured to enhance both conductance and screen life. A greater number of warp filaments are provided than shute filaments per given area. A plurality of rectangular openings are formed from the warp and shute filaments with each rectangular opening having a length and width. The length to width ratio of the rectangular openings is between approximately 2.7 to 2.8. The length of the rectangular openings to the diameter of the shute filaments is a ratio of between approximately 5.5 to 5.7. The screen cloth is calendared to assist in locking the intersections of the warp and shute filaments in place.

Abstract: A screen assembly for a vibratory screening machine including a frame in the nature of a plate having spaced apertures therein, spaced frame members on opposite sides of the apertures, a screen formed in an undulating shape having substantially parallel ridges with downwardly sloping sides, troughs formed between the downwardly sloping sides for conducting material which is being screened, undersides on the troughs, bonds for securing the undersides of the troughs to the spaced frame members which are located on opposite sides of the apertures, and channels at the sides of the plate for securing the frame to a vibratory screening machine.

Abstract: A sifting screen is described comprising a rigid frame, a first woven cloth of hard wearing metal wire, stretched thereacross and secured thereto, and a second woven cloth having a coarser mesh than the first cloth and being woven from an elongate material of greater cross-section than the first, also stretched across the frame, and secured thereto, below the first cloth, to support the latter against sagging. In accordance with the invention, at least the wearing surface of the material from which the lower cloth is woven is selected to be significantly less hard wearing than that from which the upper cloth is woven, so that wear due to rubbing and vibration during use, occurs to a greater extent in the lower cloth than in the upper cloth. In one example the upper cloth is woven from stainless steel wire and the lower from phosphor bronze wire. In another example the lower cloth is of wire having a coating of an epoxy based material, or Teflon (TM), or Molybdenum Disulphide.

Abstract: A screen for use with a vibrating screening machine to filter undesired particles from a liquid uses a filter cloth having a substantially rectangular mesh suitable for separating the undesired particles from the liquid bonded in laminar relationship to a back-up having a substantially coarser mesh. The substantially rectangular mesh is formed by a lengthwise array of parallel individual wires woven with a transverse widthwise array of parallel groups of at least three wires. The individual wires are distorted from rectangular proximate the ends of the rectangles by bows in the individual wires at their area of intersection with each of the parallel groups of wires. This configuration provides improved throughput and life characteristics over known screens. A plastic grid of mesh substantially greater than the back-up mesh may be fused to the bonded lamination of the filter cloth and the back-up.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a bonded subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

Abstract: A screen assembly for a vibratory screening machine including a frame in the nature of a plate having spaced apertures therein, spaced frame members on opposite sides of the apertures, a screen formed in an undulating shape having substantially parallel ridges with downwardly sloping sides, troughs formed between the downwardly sloping sides for conducting material which is being screened, undersides on the troughs, bonds for securing the undersides of the troughs to the spaced frame members which are located on opposite sides of the apertures, and channels at the sides of the plate for securing the frame to a vibratory screening machine.

Abstract: A sifting screen having a rigid frame, a first woven cloth of hard wearing metal wire, stretched thereacross and secured thereto, and a second woven cloth having a coarser mesh than the first cloth and being woven from an elongate material of greater cross-section than the first, also stretched across the frame, and secured thereto, below the first cloth, to support the latter against sagging. In accordance with the invention, at least the wearing surface of the material from which the lower cloth is woven is selected to be significantly less hard wearing than that from which the upper cloth is woven, so that wear due to rubbing and vibration during use, occurs to a greater extent in the lower cloth than in the upper cloth. In one example the upper cloth is woven from stainless steel wire and the lower from phosphor bronze wire. In another example the lower cloth is of wire having a coating of an epoxy based material, or TEFLON.TM., or Molybdenum Disulphide.

Abstract: A substantially planar screen for a solid particle separator is formed from one or more layers of mesh. The one or more layers of mesh are formed into a series of ridges separated by channels within the plane of the screen. The wire mesh is bonded to a rigid or semi-rigid panel having a plurality of relatively large openings as compared to those of the mesh to create a plurality of repairable screen cells. The support panel is formed with or bent into a series of alternating ridges and channels to create the ridges and channels in the wire mesh when it is bonded to the panel. The cross-sectional shape of the ridges are generally triangular to maximize exposure of surface area of the screen to a flow of material to be separated. Flat surfaces on the ridges and in the channels facilitate repair of screen cells with solid plugs.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a bonded subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a bonded subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

Abstract: A screen assembly for a vibratory screening machine including a frame in the nature of a plate having spaced apertures therein, spaced frame members on opposite sides of the apertures, a screen formed in an undulating shape having substantially parallel ridges with downwardly sloping sides, troughs formed between the downwardly sloping sides for conducting material which is being screened, undersides on the troughs, bonds for securing the undersides of the troughs to the spaced frame members which are located on opposite sides of the apertures, and channels at the sides of the plate for securing the frame to a vibratory screening machine.

Abstract: A partition diaphragm which divides a grinding chamber of a ball mill into several chambers is formed into a compound structure comprising a primary screen plate and a secondary screen plate, with the slit clearance of the secondary screen plate being smaller than that of the prior art while avoiding the occurrence of blinding. The secondary screen plate of the partition diaphragm is comprised of a wire sieve provided with fine slits having a trapezoidal shape in section. The wire seive is loosely disposed between adjacent members so as to be freely movable to a certain extent. Since there is no sticking of material by movement of the wire sieve in spite of the slit clearance in the wire sieve, fine particles in the partition diaphragm can move smoothly and the two grinding chambers are well-balanced, resulting in an improved grinding efficiency.

Abstract: A screen assembly for a vibratory screening machine including a frame, and a screen cloth on the frame having wires with a diameter D of between about 1.6.times.10.sup.3 micrometers and 17.8 micrometers with a peak to valley roughness R in micrometers which is between about R=0.333D and R=0.05D. A screen cloth for mounting on the frame having a range of dimensions as set forth above. A method of making a screen for a vibratory screening machine including the steps of providing a screen cloth having a wire of a diameter D of between about 1.6.times.10.sup.3 micrometers and 17.8 micrometers and roughing the surface of the wires to a peak to valley roughness which is between about R=0.333D and R=0.05D.

Abstract: A high speed stock thickener has a foraminous endless wire. The stock thickener is of the type in which an open mesh endless wire is trained over a pair of rolls and paper stock to be thickened is applied between the wire and the rolls and is carried on an inside surface of the wire for dewatering, particularly at the regions where the stock is carried between the wire and a roll. The improved wire is formed with a width greater than that of the rolls with a marginal edge of the wire extending beyond the face of the rolls. A guide belt is attached at each of the marginal edges of the wire and runs with a side wall in engagement with the end of the adjacent roll. The guide belts are attached to the wire by an adhesive bond between the backs of the belts and the adjacent wire surfaces, and by a continous thread which is sewn through each belt from the bottom of the belt and through the back thereof and into the wire.

Abstract: A new and unique pattern and use of flexible ribs on a solids filtering screen, such as those used in drilling wells for hydrocarbons and other substances, in conjunction with a coordinated system for hanging such screens and directing the flow of trapped solids over the surface of such screens, is disclosed. The invention counteracts the tendency of trapped solids to migrate to and congregate in the lowest areas of a suspended screen, and therefore the invention reduces the incidence of screen tearing and increases the flow rate through the screen.

Abstract: A rubber wear layer is molded to a metal sheet, which is relatively thin, in comparison with a side rail for tensioning a vibrating screen, then attached to the side rail, as above a flange which provides a connection with the screen. The rubber layer and sheet may be wider than the width desired for the rail, in which event the wear layer and sheet are trimmed to the desired width, as by shearing. The rubber layer may also have a width less than the sheet, so as to leave a lip along one edge. The aforesaid attachment is made by pins propelled by an explosive charge through the bonded layer, the sheet and the plate at spaced positions. A head of each pin abuts the sheet and the portion which extends past the plate is removed, as by grinding. The sheet may be additionally attached to the rail by spot welds at spaced psitions on the lip, which prevents the heat of welding from adversely affecting the rubber. The lip is placed on the plate opposite the flange which connects with the screen.

Abstract: The separation of a first solid component from a mixture thereof with a liquid and a second solid component which is of smaller average particle size than the first solid component, the first and second solid components being in suspension in the liquid and with the percentage by mass of the second solid component being substantially greater than that of the first solid component, by means of a travelling endless cloth. The cloth passes through an operative separating region in a horizontal manner. The mixture is fed onto substantially the entire operative separating region from a feed box that has a floor with apertures therein; the floor being located above the cloth. The liquid and second solid component pass through the cloth, to be collected by a trough. The first solid component remains on the cloth and is subsequently removed and collected.

Abstract: A screen (10) for separating particles according to size, being made up of a plurality of first straight wires (14) extending in one direction, and a plurality of alternating crimped second wires (12) extending in the same direction. A plurality of third straight wires (16) extend in the other direction, and are interwoven with each of the first and second wires. The first wires are 11/2 to 21/2 times the diameter of the second and third wires, which are of the same diameter.

Abstract: Disclosed herein is a device to aid in the preparation of foodstuffs that combines the functions of a breader, a marinator and a preparation unit in a single apparatus. This device is comprised of a tiltable mixing head supported by a mobile service cart disposed with a variety of catch basins depending upon the function being performed by the device.

Abstract: Apparatus for making plastic screen panels, and especially abrasion-resistant mining screens, includes a large rotary screen drum member on which an extruded, profiled cross-section screen surface-forming wire is helically wound at a pitch which will produce the desired screen slot width. Immediately adjacent the drum member is a rod-positioning mechanism from which a plurality of screen panel support rods are sequentially fed from a stack and welded to the wires on the drum surface in a direction parallel to the drum axis and transverse to the surface wires. The welding is done with a double-edged heater bar which is temporarily placed in contact with the rod and drum before the rod is forced against the drum. The screen drum is indexed after each support rod is attached to it by an angular amount sufficient to provide the desired spacing on the finished panel.

Abstract: Assembly apparatus for a wear resistant plastic mining screen, preferably one made out of wires formed by extruding urethane around a rigid steel core, includes a feed roll having spaced grooves for receiving elongated profile wires which define the working surface of the screen. A support rod positioning member is mounted at a welding station to frictionally receive a screen support rod on its top side and then be flipped over to position the support rod above the profile wires which pass transversely under it. A welding bar having heated fin portions on its upper and lower sides is then passed between and in contact with the support rod and the profile wires to slightly melt them. The welding bar is then quickly removed and the support rod is quickly moved downwardly against the profile wires and held until the integral joints formed at each intersection are solidified. Additional support rods are welded to the profile wires at spaced intervals until the desired screen length has been reached.

Abstract: A method and apparatus for classifying solids and transporting a solids-laden fluid containing large particle size solids which will tend to plug a tubular transport means and small particle size solids which will pass through the transport means without plugging, including passing the solids-laden fluid through a screening means and removing therefrom large particle size solids having a maximum dimension greater the internal diameter of the fluid transport means while passing through the screening means the solids-laden fluid containing small particle size solids having a maximum dimension smaller than the internal diameter of the fluid transport means and thereafter passing the solids-laden fluid containing the small particle size solids through the fluid transport means.