METHOD AND APPARATUS FOR FIBRILLATION OF CELLULOSE CONTAINING MATERIALS

摘要

In a method for manufacturing fibril cellulose, cellulose based fibre raw material is processed mechanically in a refining gap for separating fibrils. The fibres to be refined are subjected to the action of a surface roughness Ra provided by grits elevated from a refining surface delimiting the refining gap, said surface roughness being lower than 3 μm, advantageously lower than 2 μm. The refining surface is formed by spraying grits and binder onto a substrate.