Fibrous raw materials or their mechanical treatment (pretreatment of the finely-divided materials before digesting D21C1/00; methods of beating or refining pulp D21D1/00; purification of the pulp suspension by mechanical means D21D5/00)

Child Classifications

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• D21B 1/02 Pretreatment of the raw materials by chemical or physical means (removal of bark B27L)
• D21B 1/04 by dividing raw materials into small particles, e.g. fibres (breaking-up or cutting wood or the like by dry methods B27L; mechanical separation of fibres from plant material D01B1/00; hackling or heckling machines D01B5/00)
• D21B 1/38 Conserving the finely-divided cellulosic material