Screening members, screening assemblies, methods for fabricating screening members and assemblies and methods for screening materials are provided for vibratory screening machines that incorporate the use of injection molded materials. Use of injection molded screen elements provide, inter alia, for: varying screening surface configurations; fast and relatively simple screen assembly fabrication; and a combination of outstanding screen assembly mechanical and electrical properties, including toughness, wear and chemical resistance. Embodiments of the present invention use a thermoplastic injection molded material.

A screen cloth for use in a screening device for screening out oversize objects in a material flowing in a direction is provided, comprising a metal plate having a perimeter and comprising a plurality of openings therethrough and forming a grid having longitudinal ligaments substantially parallel to the direction of the material flow and transverse ligaments substantially perpendicular to the direction of the material flow, the metal plate having an impact surface and a bottom surface; a coating or liner comprising an elastomer, coating or lining at least the impact surface of the metal plate or a portion thereof; and a wear material at least partially embedded into the elastomer coating or liner, or a portion thereof.

An object-sorting apparatus includes a housing that extends from a top end to a bottom end, at least one vibration element, and a plurality of stages arranged in a vertical sequence in the housing between the top end and the bottom end. At least one of the stages includes a sorting base that at least partially defines a floor of the at least one stage. The sorting base is coupled to the at least one vibration element, and is configured to receive thereon a mixture of objects having different sizes, including a target size associated with the at least one stage. The stage also includes apertures defined in and extending through the sorting base and into flow communication with a next lower stage. The apertures are sized to receive therethrough, from the mixture, objects having a size smaller than the target size associated with the at least one stage.

Methods and apparatuses for screening are provided. Embodiments include a screen basket apparatus for screening material, comprising a grid frame having a plurality of openings arranged in a lattice and a plurality of screening cartridge assemblies affixed to the grid frame to cover the respective openings of the grid frame. The screening cartridge assembly includes a case and a screen assembly fitted into the case, and may be affixed to a set of transversal member of the grid frame. The case may be formed of a single injection molded piece integrally formed by injection molding one of a polyurethane or a thermoset polymer. The screening elements together form a generally continuous screening surface across the exterior of the grid frame, which reduces blinding and is resistant to wear and tear.

Screen assemblies for vibratory screening machines are provided herein. A screen assembly comprising: a plate comprising: a center portion with a plurality of apertures, a first end having a first series of finger-receiving apertures, a second end having a second series of finger-receiving apertures, wherein the first and second ends of the plate extend to cover the first and second series of finger-receiving apertures; and a screen covering the plurality of apertures.

Screening media for screening material includes a main body and a plurality of openings extending through the main body between a contact face and back face. The openings are of a shape of a convex and non-regular polygon, and are arranged in an orientation such that a line through the most proximal vertex of the polygon and parallel to a defined material flow direction divides the most proximal interior angle of the polygon. Such a configuration allows the openings to not easily get pegged and to improve screening performance.

Screening members, screening assemblies, methods for fabricating screening members and assemblies and methods for screening materials are provided for vibratory screening machines that incorporate the use of injection molded materials. Use of injection molded screen elements provide, inter alia, for: varying screening surface configurations; fast and relatively simple screen assembly fabrication; and a combination of outstanding screen assembly mechanical and electrical properties, including toughness, wear and chemical resistance. Embodiments of the present invention use a thermoplastic injection molded material.

A sieve frame, including: a sieving component arranged in a horizontal direction; a support component arranged below the sieving component, spaced apart from the sieving component, and disposed parallel to the sieving component, the support component including a plurality of openings; a cleaning component arranged between the sieving component and the support component, supported by the support component, and used to clean the sieving component; and a bottom plate arranged below the support component, the bottom plate including an inclined surface inclining relative to the horizontal direction and a material discharging port arranged on a side edge of the bottom plate, and the inclined surface extending to the material discharging port. A sieving device is further included. The sieve frame and the sieving device exhibit high material discharging speed, and the sieve frame provides a high yield. The device has a reduced size and a reduced footprint.

A shaker screen assembly comprising a support frame and a screen subassembly attached to the support frame is provided. The screen subassembly includes a planar panel and a mesh section attached to the planar panel. The mesh section includes a series of undulations, each undulation including an elongated base portion and an elongated raised portion. Each of the elongated base portions includes a bottom planar portion, a first undulation side, and a second undulation side.

A screen panel for a vibratory machine includes a polymer layer comprising a resilient material and defining a plurality of panel apertures extending through the polymer layer from an upper screening surface to a bottom surface of the polymer layer, each of the plurality of panel apertures defining an aperture perimeter. The screen panel includes a reinforcing structure having a top surface that supports at least a portion of the bottom surface of the polymer layer, wherein the reinforcing structure is positioned under the polymer layer along only a portion of the aperture perimeter of each of the plurality of panel apertures.