Widening of the food products assortment is one of most priority tasks under conditions of the modern market environment. The increase of purchasing ability of consumers and intensive development of technologies has favored the development of the competitive environment. New food products can be obtained as a result of using innovative techniques of raw material processing, able to minimize losses of nutritive and biologically active elements. At the same time, it is expedient to use little-spread types of raw materials, especially triticale seed.

The seed mass contains admixtures of the organic and inorganic origin. An important quantity of admixtures shortens the seed storage duration without losses of its quality. At that admixtures favor the decrease of the working resource of seed shelling and seed grinding, and their presence in ready food products is strictly regulated by quality and safety standards.

A geometric characteristic of seed has an important value at corn purification. Seed release from admixtures, different by width, length and thickness is one of least expensive and most effective methods. That is why sieve and sieve-air separators are most spread in the seed processing industry, especially at initial seed processing.

The research object was seed of four-type triticale of varieties ʻAlkidʼ, ʻStrategʼ, ʻTaktikʼ, line ʻLP 195ʼ and ʻKharkiv Khlobodarʼ. Triticale seed was cultivated in control identical conditions at the experimental plot of the Uman National University of gardening (Ukraine) under conditions of the Right-bank forest-steppe of Ukraine. The precursor – occupied fallow. Introduction of fertilizers: nitric – 120 kg/he, phosphoric and potassium – 60 kg/he.

Triticale seed had different sizes and evenness depending on variety. It can be explained by the studied genetic peculiarities of triticale seed. Seed of the line ʻLP 195ʻ had the width by 0,2–0,3 mm more, comparing with other varieties of triticale seed. The more thickness indices (by 0,1–0,2 mm) were inherent to the variety ʻKhlibodar Kharkivskyʼ. The longest was seed of the variety ʻAlkidʼ. That is why the difference of geometric sizes of triticale seed between sorts must be taken into account at the primary cleaning of raw materials and formation of triticale seed lines.

There has been scientifically grounded the expedience of triticale seed division in three fractions: big, middle and small. The big one includes seed, obtained by a sieve of 3,0–20 mm. The middle one consists of seed, obtained by sieve orifices of 3,0–20 mm and 2,2–20 mm. Small seed is from sieve orifices of 2,2–20 mm. It is expedient to eliminate the small fraction for using four-type triticale seed effectively.