Indosaw Hand Testing Sieves Wooden Square

Set of wood and steel sieves for accurately separating wheat samples by size and shape.

• Set includes five specific sieves with both round (RH) and oblong (OH) holes, carefully calibrated for wheat
• Sieves are made with seasoned wood nesting frames, which are resistant to warping and shrinking
• Perforated steel sheets are electroplated, making them resistant to rust and corrosion
• Set includes a top pan for holding the sample, a bottom pan for collecting fines, and tie rods to secure the entire stack
• Complete system allows for a full, multi-stage separation process in a single operation, from coarse to fine impurities
• While calibrated for wheat, the combination of round and oblong holes makes this set suitable for separating other similar-sized seeds and grains

This set of sieves, designated as the 7390 model, is a specialized tool designed for the intricate process of seed sample separation, specifically for wheat. It operates on the principle of mechanical separation, where seeds are sorted by size and shape using a series of nested sieves with precisely sized perforations. The use of a combination of round and oblong holes allows for a comprehensive and precise separation. A sample is placed in the top pan, and the stack is typically placed on a mechanical shaker. As the sieves vibrate, the particles fall through the holes. Oversized impurities are retained by the top sieves, healthy wheat grains are retained on a specific sieve, and smaller impurities like sand, dust, and broken grains fall through to the bottom pan. The final result is a clean sample of wheat, sorted by size and shape, which is essential for quality grading and analysis.

Construction and Design: The sieves are constructed from seasoned wood nesting frames, a deliberate choice of material for several reasons. Seasoned wood is dimensionally stable, meaning it's less prone to warping or shrinking due to changes in humidity, which is crucial for maintaining the precise fit of the nesting frames. This snug fit prevents seeds from leaking between the sieves and ensures that the sorting process is accurate. The use of wood also provides a sturdy yet lightweight structure, making the sieves easy to handle. The sieve meshes themselves are made from electroplated steel perforated sheets. This material combines the strength of steel with a protective layer provided by electroplating. The electroplating process makes the steel corrosion-resistant and smooth, which prevents seeds from sticking to the surface and ensures a consistent flow. The perforations are meticulously cut to specific dimensions, which is the core of their function. The set includes five sieves, along with a bottom pan, a top pan, and tie rods. The nesting design allows the sieves to be stacked one on top of the other, with the largest perforations at the top and the smallest at the bottom. The top pan holds the sample, and the bottom pan collects any material that passes through all the sieves. The tie rods secure the entire stack together, ensuring that the sieves remain tightly nested during the separation process.

Application and Functionality: The sieves are specifically calibrated for wheat, with each sieve having a unique perforation size designed to separate different components of a wheat sample. The designation of the sizes (for example, 6.0 RH, 5.5 RH, 1.85 OH, 2.0 OH, 2.25 OH) refers to the shape and size of the holes. RH likely stands for Round Hole, while OH refers to Oblong Hole (also known as slotted) Round Hole (RH) Sieves: These are used for separating seeds based on their diameter. The larger round holes, such as the 6.0 RH and 5.5 RH, are used to remove oversized impurities like stones, large weed seeds, or oversized wheat kernels Oblong Hole (OH) Sieves: These sieves, with sizes like 1.85 OH, 2.0 OH, and 2.25 OH, are used for separating based on the length or width of the seed. This is particularly effective for removing thin, elongated impurities or broken grains that might have the same diameter as a healthy seed but are shorter