FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT

**Definition:** This place covers:

The preparation of fibrous raw materials, e.g. wood, rags, waste paper or pulp bales and their mechanical treatment to obtain mechanical pulp, in particular for paper-making and the production of fibreboard, comprises pretreating raw materials before pulp preparation, pulp preparation by dividing raw materials into small particles, e.g. by dry or wet methods of mechanical defibrating (cutting, grinding, kneading in mills or pulpers), conserving the obtained finely-divided cellulosic material (wood chips).

**Limiting references (this place does not cover):** - Splitting wood; Manufacture of veneer, wooden sticks, wood shavings, wood fibres or wood powder -> B27L - Obtaining fibres from plant material (mechanical separation) -> D01B1/00 - Hackling or heckling machines -> D01B5/00 - 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