Process för producering av torkade och sorterade cellulosamassafibrer

摘要

Production of dry cellulose fibres consists of introducing wet pulp and air into a jet drier (20) to form separate cellulose fibres, and includes a predrying stage in which additive is introduced to reduce fibre knotting. The anti-knotting agent is selected from a group comprising a surfactant and mineral particles, and it is mixed mechanically with the pulp to produce a pulp in a foam state before it is fed into the drier. Production of dry cellulose fibres consists of introducing wet pulp and air into a jet drier (20) to form separate cellulose fibres, and includes a predrying stage in which additive is introduced to reduce fibre knotting. The anti-knotting agent is selected from a group comprising a surfactant and mineral particles, and it is mixed mechanically with the pulp to produce a pulp in a foam state before it is fed into the drier. Alternatively, the wet pulp can be treated with a substance selected from the group comprising a reticulation agent and a water-repellent material. The aim of the treatment is to reduce the number of knots to below 5 per cent and preferably below 1.6 per cent. After drying, the fibres have a moisture content of less than 2 - 10 per cent by weight.