Sieves and screens are mechanical separation devices designed to classify, grade, scalp, or filter solid particles and liquids based on particle size. They are critical across pharmaceuticals, food processing, chemicals, mining, and construction to ensure product quality, uniform particle size distribution, and equipment protection.
Key Technical Specifications & Features
-
Screen Media Materials:
-
Stainless Steel Wire Mesh (304/316/316L): Offers high tensile strength, heat resistance, and corrosion protection; essential for food-grade and pharmaceutical applications.
-
Synthetic Mesh (Nylon/Polyester): Highly flexible and resistant to fatigue; widely used in fine sifting and wet filtration.
-
Polyurethane & Rubber: High wear resistance and dampening capabilities; used primarily in heavy mining and aggregate processing to handle abrasive materials.
-
Perforated Metal Sheets: Round, square, or slotted holes drilled/punched for heavy-duty pre-scalping and coarse separation.
-
-
Sieve Geometries & Weave Types:
-
Plain Weave & Twill Weave: Standard square apertures for accurate sizing.
-
Dutch / Cable Weave: Tight, dense weave structures ideal for liquid-solid separation and fine filtration.
-
Wedge Wire (Slot Screens): V-shaped profile wires providing non-clogging surface openings for high-viscosity slurries and dewatering.
-
Manufactured from high-purity, food-grade, and medical-grade silicone elastomers, these seals are built to withstand cyclic movement, extreme temperature variations, and aggressive chemical exposure without losing structural memory or elasticity.
Primary Types of Sieves & Screens
-
-
By Operating Mechanism:
-
Vibratory Separators (Circular/Linear): Utilize eccentric motors to create multi-plane motion, causing particles to spread evenly over screen surfaces for high-throughput grading and scalping.
-
Gyratory Sifters / Reciprocating Screens: Move in a gentle horizontal plane to prevent particle degradation; optimal for delicate food powders, grains, and dry chemicals.
-
Trommel Screens (Rotary Drums): Cylindrical rotating screens used for continuous high-capacity separation of bulk materials, compost, and aggregates.
-
Air Jet Sieves: Use vacuum-assisted air streams to disperse fine, cohesive powders ($< 100 \ \mu\text{m}$) that easily blind standard mechanical sieves.
-
Laboratory Test Sieves: Standardized, high-precision circular frames (ASTM E11 / ISO 3310 compliant) used for quality control and Particle Size Distribution (PSD) analysis.
-
-
By Motion & Application:
-
Scalping Screens: Remove oversized foreign contaminants or clumps from a bulk stream rapidly.
-
Classification / Grading Screens: Separate a single product stream into multiple specific size fractions simultaneously using multi-deck configurations.
-
Dewatering Screens: Separate liquids from slurry mixtures to reclaim dry solids.
-
-
-
Key Industry Applications
Pharmaceuticals & Fine Chemicals: Powder classification, active pharmaceutical ingredient (API) particle sizing, and quality control test sieving.
Food & Beverage Processing: Flour sifting, sugar grading, spice de-dusting, and liquid juice clarification.
