MECHANICAL TREATMENT OF NATURAL FIBROUS OR FILAMENTARY MATERIAL TO OBTAIN FIBRES OF FILAMENTS, e.g. FOR SPINNING (crude extraction of asbestos fibres from ores B03B; apparatus for retting D01C)

Description

D01B covers mechanical processing of natural fibrous materials—such as cotton, wool, flax, hemp, and silk—to prepare them for spinning into yarn. The classification encompasses techniques including opening, cleaning, carding, combing, and other preparatory operations that separate, align, and condition fibers while removing impurities and foreign matter. This subclass addresses both the machinery and processes involved in fiber preparation but excludes chemical or bleaching treatments, which are covered elsewhere in the D section.