FIELD: paper-and-pulp industry.
SUBSTANCE: pulp for manufacturing lyocell fiber comprises processed alkali cellulose paste containing hemicellulose in amount at least 7% and cellulose having median degree of polymerization between about 200 and about 1100, copper number about 2.0,w herein more than 4% of pulp fibers have length-weighted average fiber length below 2.0 mm. Lyocell fiber comprises above-defined hemicellulose. Process for preparing composition to be converted into Lyocell fiber comprises boiling in boiler to produce alkali pulp wherein feed contains sawdust in amount between 0 and 100% and contacting alkali pulp containing cellulose and at least about 7% of hemicellulose, under alkaline conditions, with oxidant in amounts high enough to lower average cellulose polymerization degree from about 200 to about 1100 without decrease in content of hemicellulose in pulp to below about 50% or significant increase of copper number to above about 100%.
EFFECT: enabled preparation of rapidly dissolving compositions.
80 cl, 6 dwg, 2 tbl, 3 ex
