Vibrating Screen Mesh Deck

Function

Accurate size separation of hot aggregate is the prerequisite for producing asphalt mixes to gradation specification. If deck wire apertures enlarge through wear or breakage, oversize aggregate passes to the fine fraction and coarsens the mix gradation, affecting voidage, stability and surface texture in the finished pavement. Broken wires create open holes that cause severe cross-contamination. Regular wash-down inspection and prompt replacement of worn or broken decks ensures that hot-storage bins are consistently supplied with correctly graded material, preventing costly mix rejections and pavement performance failures.

Construction & quality

Screening wire: drawn high-carbon spring steel (C 0.70–0.90 %) for standard duty, or 304/316 stainless steel for corrosive or chemically sensitive environments, wire diameter 2.5–5.0 mm depending on aperture size. Mesh is woven (crimped wire, plain square or rectangular aperture) for fine-to-medium screening or resistance-welded grid for heavy-duty coarse aggregate decks. Aperture tolerance ±5 % of nominal per ISO 4783. Panel edges are finished with PVC or rubber edge strips to protect the screen frame seal and prevent aggregate lodging at the panel perimeter. Panels are supplied to exact frame dimensions with pre-tensioned hooks or bolted tensioner bars as per the screen box design.

When to replace

• Wire diameter reduced by more than 30 % of original gauge, measured by calibrated caliper — remaining section is structurally marginal.
• Any broken or displaced wire creating an irregular aperture gap — a single break triggers full-deck replacement.
• Gradation test results showing persistent cross-contamination between adjacent aggregate fractions in hot-storage bins.
• Increased vibration or abnormal screen-box noise indicating partial mesh delamination from the frame seal.
• Aggregate of the specified reject size found in the wrong hot-storage bin on sampling.