After sorting the seed, the seeds are inserted into this machine to separate the longitudinal impurities. Unlike other sieves that remove impurities based on transverse dimensions, the longitudinal separator removes the impurities based on the longitudinal dimensions. The device is equipped with two cylinders for separating particles and long grains, both of which are embedded consecutively. For the purpose of separating the short impurities, initially the seeds are inserted into the first cylinder to separate the broken wheat and weed seeds (black seed).  Then the seeds are inserted into the second cylinder to separate different types of long impurities such as barley, oats, and so on.