Abstract: This invention relates to an improvement in a press or reversing roller for double sieve band dehydrating machines for dehydrating suspensions, particularly a press roller in which the sieves with an interposed sheet of material partially loop over the roller, the roller being provided in a multiple-piece manner over the sieve path, and wherein one step bearing is provided at the contact point of two adjacent rollers, the improvement comprising stationary covering means secured between end faces of adjacent rollers, said covering means having the same radius as said adjacent rollers at least in the looping area and serving as a glide shoe.

Abstract: Apparatus for the batch filtration of suspensions comprising a plurality of press-chambers and filter belts for transporting the suspension stepwise through the press-chambers, such that after pressing the suspension in the first press-chamber and before entry of the resultant press cake into at least one subsequent press-chamber, the structure of the press cake is changed by shearing forces and the press cake is curved and at least partially torn apart. In the case of municipal sludge the flaked sludge is subjected in a first pressing zone to slow increase of pressure and a pressure of up to about 1 bar and is subjected in at least one following press zone to a pressure increase which is more rapid than in the first press zone, up to a pressure of about 3 bars.

Abstract: A filter apparatus comprising a gravitional extraction section 1 and a high pressure section 3. In the high pressure section 3 there is a rotatable drum 35 around which a pair of filter bands 4,5 on carrier belts 6,7 are advanced with means for applying pressure to the belts to squeeze the bands and belts together to expel water from the sludge 13 through open-topped channels formed in the carrier belts. An intermediate section 2 for applying medium pressure to the sludge may be provided and the bands and belts are continuous. Various special features like cleaning, different pressure loading systems, and driving means and other modifications are described but the principle is to progressively increase the pressure by advancing the sludge between the belt and carrier assembly and to arrange for the water expelled to be diverted through the channels 8,9 in the carrier belts with no frictional drag between the respective bands and belts as they advance at the same speed.

Abstract: Apparatus for conveying and dewatering wet coarse screenings debris comprises a drag chain conveyor having a conveying flight. A pressing unit is mounted above the conveying flight and exerts a downward pressure on the debris. A trough having a perforated bottom is mounted beneath the conveying flight in the vicinity of the pressing unit.

Abstract: A pair of continuous belts, at least one which provided with openings for percolation, are arranged in overlapping relationship and controlled to forward move in the same direction. A loading hopper is provided at the initial portion of the lower belt, and means are arranged opposite to said hopper for varying the angle of convergence of the two belts and accordingly varying, as required, the pressure action exerted by said two belts on the product being treated.

Abstract: A device for dewatering sludge or the like, particularly sludge from water purification plants, having a preliminary pressureless pocket dewatering stage A, one or more horizontal dewatering zones B formed by horizontally extending filter belts located below the preliminary stage A, those zones being located serially one below another, a medium pressure drum filter stage C, and thereafter a high-pressure dewatering unit D.

Abstract: Sludge like sewage sludge is fed at the beginning of a path of travel of two endless belts of filter material. The sludge, carried between the two endless belts, is compressed and dehydrated between a drum which is supported in bearings with its periphery in contact with one of the endless belts and pressure belts which are trained around a plurality of rolls and brought into contact with the other of the endless belts. The pressure belts are composed of a multiplicity of narrow belts. Pressing by individual pressure belts is applied to the endless filter material belts at a suitable number of stages into which the path of the filter material belts is divided. Preferably, pressure is exerted on the sludge by a smaller number of pressure belts at early pressing stage and by a larger number of pressure belts at later pressing stages.

Abstract: An extended nip press for a paper machine for removing water from a fiber web carried by a porous felt through a press zone in which the web is subjected to a pressure action. The press comprises press rolls forming at least two separate press nips and a sealing element positioned between the second rolls forming the press nips. The web, the felt and a band supporting the web and felt is passed through the press nips. A pressure medium chamber is limited by that part of the band which extends between the press nips, by the secondary rolls and the sealing element for subjecting the web to the pressure action. The press nips form rolling seals between the secondary rolls and the band.

Abstract: An apparatus for dewatering aqueous materials such as a suspension, e.g. a slurry, by continuous pressing of the materials under high pressure. The dewatering is carried out in transport of the suspension between two driven webs which exert a pressure against the suspension, the latter by enclosing the webs at least partly about at least one press roll being subjected to an increased pressure by the enclosure to increase the dewatering effect, and at least the outer web relative to the press roll being pervious to the pressed out water content.

Abstract: Apparatus is provided for the continuous treatment of sludge, which is made possible through the advantageous combination of at least two independent dewatering steps at consecutively higher pressures and increased dwell time. In a preferred embodiment there is provided a three stage process where there is a first dewatering at the pressure provided by gravity action, the sludge being strained through continuous filter pockets; a second moderate pressure stage with a drum filter press; and a third higher pressure stage.

Abstract: The dewatering system includes a first endless filter belt movable along its length through an upper run, then through an arc about a dewatering drum, and then through a lower return run in a sinuous path about a plurality of rollers. A flowable aqueous material or slurry, such as sludge, is deposited on the upper surface of the belt as it moves along its upper run. A subatmospheric pressure is applied to the lower surface of the upper run of the first belt to induce the liquid to drain from the sludge. A second endless filter belt is movable into sandwiched relationship with the first belt about the sludge and moves with the first belt about the dewatering drum and about the plurality of rollers in the sinuous path of the return run.

Abstract: Method and apparatus for separating liquids from soft particulate food solids, especially for cottage cheese. A tensioned belt is partially wrapped around a foraminous drum to compress a layer or bed of food particles advancing on the exterior of the drum wall through a separation zone beneath the belt. The belt run opposite the drum wall is free to flex and yield and to expand and contract the cross-sectional area of the separating zone, depending upon the thickness of the bed of food particles in said zone. Accordingly, delicate such particles will not be damaged or broken up into small particles, as would happen if a thick bed is forced through a zone of fixed cross-sectional area. Moreover, pressure is maintained on the bed when it is thin. A belt tightener is provided which will maintain a desired tension on the belt so that the belt will always exert a predetermined desired pressure on the bed.

Abstract: This invention relates to an improvement in a press for dehydrating material in which the material is passed between two endless sieve belts adapted to move in the same direction and to pass over and around pairs of rollers and/or offset upper and lower rollers, the rollers in various sets forming a pre-dehydration zone and a wedging or compression zone,The improvement comprising a compression zone in the form of a frame-like structure, said structure containing individual compression roller means mounted on bearing blocks of varying heights,And means for displacing and/or exchanging said bearing blocks, whereby a path for said material has an ascending slope with line compression, or is wavelike or S-shaped with surface compression.

Abstract: There is disclosed a device for dewatering sludge such as residuals in sewage discharge processing installations. The device provides that cakes are formed of the sludge. These cakes have initially a high water content and are of non-homogenous, loose consistency. They are guided between filter bands through a preliminary filtering zone in which some of the water contained in the cakes is extracted by straining and pressure action applied thereto. The filter bands with the cakes therebetween are then successively guided over a first dewatering drum and a subsequent second dewatering drum. Pressure is applied to the filter band while being guided about the drums, thereby extracting further water from the cakes. Additionally, the cakes while traveling from the feed-in point toward and through pressure zones are deformed and also turned over thereby compacting the cakes as water is extracted therefrom. Finally, the cakes after being sufficiently dewatered and compressed are discharged.

Abstract: There is disclosed a device for dewatering sludge, sewage and other materials containing water and solid particles. The device comprises at least two rotatable and two superimposed power driven filter bands which are successively guided to and about the perforated cylindrical walls of the drums in pressure engagement therewith so as to drive the drums in opposite direction and causing release of water from sludge fed between the two filter bands. After leaving the last drum the bands are guided by rolls along a meandering path along which the sludge is repeatedly stretched and pressed to cause further release of water from the sludge and to discharge the now dewaterized sludge at the end of the path.

Abstract: Apparatus for compacting loose, spongy or disintegrated solid material in which a pair of conveyor surfaces, one of which is fluid-pervious but solid-impervious, are disposed in convergent spaced relation with one another to form a compacting zone. Fluid is removed from the compacting zone through the fluid-pervious conveyor surface. Material to be compacted is supplied to the divergent end of the compacting zone while the surfaces are moved towards the convergent end of the compacting zone to cause the material to be compacted.

Abstract: A press comprises two cooperating endless belts each trained over a support and tensioning roller. The end supports of the support roller for the lower belt rest on a hydraulically actuated piston which enables this support roller to be displaced towards the other support roller. Two pairs of like bracing members hold the end supports of the support rollers, the bracing members of each pair having one end pivoted to a respective hydraulic cylinder for the pistons and the end supports of the other support roller being detachably fixed to the other bracing member ends. Each pair of bracing members defines a guide for the displacement of the end supports of the support roller for the lower belt. One of the end supports of each support roller is pivotally mounted for pivoting the support rollers in a plane defined by the axes of the support rollers.

Abstract: A process and apparatus for continuous removal of liquids from sludges. The apparatus includes an endless driven lower pervious belt and an endless driven upper impervious belt. The impervious belt is supported by an upper frame positioned above a fixed lower frame member by spring-loaded, adjustable hydraulic cylinders. The two belts are driven at different speeds to provide continuous shear on sludge pressed between the belts. Each belt is supported on a plurality of horizontally spaced rollers with the rollers for the upper belt and the rollers for the lower belt being longitudinally offset from each other. The horizontal roller spacing from the point of contact of the upper belt to the sludge as it is fed in between the belts is of a diminishing progression which may be arithmetic, geometric, or a combination thereof from the point of contact of the upper belt on the sludge to the discharge end.

Abstract: Fruit press comprising an endless conveyor belt for transporting the fruit or other material to be dewatered or dejuiced, the belt being driven in a horizontal direction, one or more hydraulic platens for compressing the fruit or other liquid-containing compressable material for dejuicing, dewatering, or deoiling the same, as the case may be, movable, permeable sides associated with each platen to contain the sides of the cake being pressed by the platen and vertically movable gates upstream and downstream of each platen to contain the cake being pressed.

Abstract: There is disclosed a method of dewatering sludge such as residuals in sewage discharge processing installations. The method provides that cakes are formed of the sludge. These cakes have initially a high water content and are of inhomogenous, loose consistency. They are guided between filter bands through a preliminary filtering zone in which some of the water contained in the cakes is extracted by straining and pressure action applied thereto. The filter bands with the cakes therebetween are then successively guided over a first dewatering drum and a subsequent second dewatering drum. Pressure is applied to the filter band while being guided about the drums, thereby extracting further water from the cakes. Additionally, the cakes while traveling from the feed-in point toward and through pressure zones are deformed and also turned over thereby compacting the cakes as water is extracted therefrom. Finally, the cakes after being sufficiently dewatered and compressed are discharged.

Abstract: A dual press having hydraulic units which are controlled to regulate the pressure exerted on material being treated. A control system includes sensing means along the path of materials passing to the press and sensing means along the path of materials passing from the press. Thus, sensing means control the hydraulic units and regulate the pressure so as to maintain a predetermined maximum pressure when a continuous supply of material is passing through the press. The pressure is reduced or removed completely when the supply of material is decreased or interrupted.

Abstract: A filter belt with multiple strip or wafer elements assembled side-by-side to extend as a row extending the length of the belt.

Abstract: A dewatering machine comprising an integral and cooperative combination of a vacuum filter of the rotary drum type and an expression device of the type wherein a diaphragm is pressed against a drainage deck. An intermittently-indexed first endless filter medium belt carries filter cake to the expression device after the cake is formed on the vacuum filter. A second endless filter belt is trained to run beneath the diaphragm of the expression device parallel to the drainage deck and above the first filter belt so that the filter cake is sandwiched between the two filter belts. The belt indexing action is coordinated with pressurization of the expression device so that the filter drum is indexed only when the diaphragm is relaxed and the pressurization is effected only at such times as the drum is not being indexed. The second filter belt prevents the pressed material from adhering to the diaphragm of the expression device.

Abstract: A filter consisting of two endless belts of filter material having runs pressed together, of means pressing a run of one belt against the adjacent run of the other, and of a feed device for introducing the slurry between the runs.

Abstract: Hay and similar crop materials can be efficiently compacted and formed into pellets or cubes through a closely coordinated sequence of operations in which the hay picked up from the field is deposited into a feed bin, then advanced by gravity feed uniformly onto a cross feed conveyor which advances the hay through a compaction stage in which the hay is precompressed to bale density, and thereafter it is continuously advanced between a pair of counter-rotating press wheels which further compress and form the hay into dense pellets or cubes.

Abstract: The press is made up to operate continuously to squeeze agricultural products such as grapes. The press is formed of a pair of driven endless belts which are disposed to define a converging passageway. The belts are also mounted in spring means to adjust to a build-up in pressure in the passageway and to permit an increase in the passageway at the exit end to accommodate an increased flow.

Abstract: This invention relates to an improvement in a roller arrangement for removing water from fibrous material in which the material is fed between a pair of endless sieve bands which rotate in contact with each of upper and lower rollers. The improvement comprises upper and lower rollers each having a smaller diameter in the operating direction of the sieve bands than the preceding roller, and the vertical axial distances of the rollers also decrease in the operating direction. The invention also includes an improvement in which an additional roller is mounted above at least one upper roller contacted by both of the sieve bands, and the additional roller having a smaller diameter than the upper roller, whereby the sieve bands pass around the rollers in a Z-shaped path.