According to one aspect there is provided a screen assembly for a vibrating screening machine. The screen assembly comprises a screen chassis and a screen for screening material such as a solution containing liquid and solids. The screen chassis comprises a first face and a second face opposite to the first face, the screen chassis defining a plurality of openings therethrough from the first face to the second face for allowing passage of a material that has been screened. The screen is attached to the first face of the screen chassis and covering the openings of the screen chassis at the first face. The screen chassis may be made of a light-weight, stiff material. The screen may be made of a durable material such as metal. A method for making a screen assembly is also provided.

Embodiments of the present disclosure include a screen basket apparatus includes a substantially vertical cylindrical frame and a synthetic screening surface secured to the frame. The synthetic screening surface may be configured to separate carbon or resin from a slurry of a carbon-in-leach, carbon-in-pulp, resin-in-leach, or resin-in-pulp material as fluid flows from outside to inside the screen basket apparatus such that carbon or resin is retained on an external surface of the synthetic screening surface. The cylindrical frame may be a grid frame and the synthetic screening surface may include a plurality of replaceable screen assemblies attached to the grid frame. The grid frame may include a plurality of openings and each of the plurality of openings is configured to receive a respective one of the plurality of replaceable screen assemblies. The synthetic screening surface may include injected molded thermoplastics, thermoset polyurethanes, and/or other polymeric materials.

The invention relates to screening panels such as a mineral screening panel, and related screening systems. In one aspect, the invention provides a panel suitable for engaging a supporting frame in abutment with a number of adjacent screening panels including: a screening surface with peripheral sides and screening apertures between the peripheral sides; each peripheral side having a plurality of engaging protrusions extending from the peripheral side in a direction transverse to the screening surface for engaging the supporting frame to secure the screening panel to the supporting frame; wherein the protrusions are shaped and sized to engage complementary formations on the supporting frame in a snap-fit configuration. The invention also relates to a screening system including a plurality of screening panels and a supporting frame.

A sifter insert for use in a sifting device has an insert frame and a screening media affixed thereto. An insert frame air channel is located within the insert frame. The sifter insert is sized to be received in a sifter box frame of an associated sifter box. The sifter box frame has a box frame air channel in fluid communication with the insert box frame channel of the received sifter insert. The passage of air through the box frame air channel and the insert frame air channel may cool the sifter box and the insert frame, and may cool the screening media and the material being sifted thereon. Channel holes in the insert frame may direct air from the insert frame air channel to the screening surface of the screening media.

A continuous sieving apparatus is described. The continuous sieving apparatus includes a sieve surface attached to a wall. A set of openings is formed in the sieve surface so as to define a set of pathways extending through the sieve surface. The set of opening are defined by a length dimension that is greater than a width dimension. An action system is configured to move the sieve surface in one or more directions (e.g., horizontally and vertically). Such movement causes a first pupa having a first cephalothorax width that is less than the width dimension to move through any one of the set of openings, and a second pupa having a second cephalothorax width that is greater than the width dimension to be prevented from moving through the set of openings.

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.

Thermoplastic polyurethane (TPU) compositions, methods for producing TPU compositions, methods of using TPU compositions, and apparatuses produced therefrom are disclosed. Disclosed TPU compositions include a thermoplastic polyurethane polymer, a heat stabilizer, a flow agent, and a filler material. The filler may be a glass fiber. Disclosed TPU compositions have improved thermal stability and improved flow properties suitable for injection molding of articles of manufacture having a large plurality of fine openings or pores. Articles produced from the composition have superior thermal stability, abrasion resistance, and chemical resistance. Example articles include screening members for vibratory screening machines. Further embodiments include compositions without heat stabilizers, flow agents, and filler materials, and compositions in which two TPU materials having different harnesses are combined to generate a material with a pre-determined hardness. Injection molded screen elements having openings from 25 to 150 microns and open screening area from 10% to 35% are disclosed.

A disclosed screen assembly includes a frame and a tensioned molded polyurethane screen attached to the frame. The frame has a perimeter that is a circle, square, rectangle, triangle, pentagon, hexagon, or other multi-sided polygon, and the screen may have similarly shaped apertures. The frame includes a support grid structure bounded by the perimeter and the screen may either be attached only to the perimeter of the frame, or may be attached to the perimeter of the frame and to one or more locations of the support grid structure. The screen may include uniaxial or biaxial reinforcement members that are integrally molded with the screen, and the tensioned screen may include tension along a direction that is parallel to, or perpendicular to, a direction of the reinforcement members. A disclosed method includes applying tension to a molded polyurethane screen and attaching the tensioned molded polyurethane screen to the frame.

The present disclosure discloses a wave-shaped polyurethane high-frequency linear vibrating screen mesh, which solves the problems of unobvious layering and poor screening effect of the existing screen mesh. The wave-shaped polyurethane high-frequency linear vibrating screen mesh comprises a side blind area and a screening area. The screen area is composed of wave-shaped injection molding polyurethane screen pieces. Materials roll forward along the direction of material flow in a wavy manner. Clamping grooves are formed in the blind area, which can be in buckle fit on rail seats of a small beam of a screening machine. The screen gap direction of the screening area is consistent with the direction of the material flow. Through the arrangement of a wave-shaped screen mesh surface, the wave-shaped polyurethane high-frequency linear vibrating screen mesh effectively optimizes the running state of the materials, and promotes effective layering of coarse and fine materials.

A sifter insert for use in a sifting device has an insert frame and a screening media affixed thereto. An insert frame air channel is located within the insert frame. The sifter insert is sized to be received in a sifter box frame of an associated sifter box. The sifter box frame has a box frame air channel in fluid communication with the insert box frame channel of the received sifter insert. The passage of air through the box frame air channel and the insert frame air channel may cool the sifter box and the insert frame, and, may cool the screening media and the material being sifted thereon. Channel holes in the inset frame may direct air from the insert frame air channel to the screening surface of the screening media.