The screening surface of the mill trommels is formed from the modules forming the screening screen 1 and the conveying screw 2 at the same time. The screw is made in the form of a series of conical "fingers" capable of passing a liquid phase of the pulp through itself and transporting a solid phase along the screening surface. Due to this, the liquid phase of the pulp, penetrating through the fingers, spreads uniformly over the surface of the screen, thereby reducing the specific load on the screen, its wear and allowing to reduce the screw's height by 2-3 times in comparison with the continuous one. During operation, the vibrations of the fingers are transferred to the screening screen, increasing the efficiency of classification and self-cleaning of the screen.

Screw design together with the screen ensures uniform wear of the screen and screw and allows for simultaneous replacement. The dimensions of the cell, the live section and the dimensions of the screw are met in accordance with technological requirements.

__The design of the module fastening lock to the body of the butara, such as "swallowtail", allows you to quickly mount (dismount) the module._