METHOD FOR PRODUCING LOW-FLAMMABLE TECHNICAL HEMP FIBER AND THE CORRESPONDING FIBRE Russian patent published in 2023 - IPC D01C1/00 

FIELD: processing plant material.

SUBSTANCE: invention is related to processing of technical hemp fibres. The method for producing a low-combustible technical hemp fibre contains a step at which a flame retardant composition is applied to the fibres. At the same time, before that, the technical hemp straws are subjected to scutching and separation of the fibrous part from the fire by means of a scutching machine, the fibrous part is defibrated into a fibrous material (fibre) by means of defibration units, and the remaining lignin is removed by steam treatment. The defibration units are sequentially located defibration units with drums, the first two units are equipped with drums with pins, and the last two units are equipped with a full-metal saw blade wound on a metal shell of the drum, while the rotation speed of the drums increases from the initial to the final one.

EFFECT: invention makes it possible to improve impregnation of technical hemp fibres with a flame retardant composition and to increase their fire resistance.

7 cl, 1 dwg