Method for the manufacture of solvent-spun cellulose fibre involving transport of cellulose solution through pipes

A method for the manufacture of solvent-spun cellulose fibre including the steps of:

• (a) forming a solution of cellulose in an aqueous N-methylmorpholine N-oxide solvent;
• (b) passing said solution through at least one pipe, the temperature in degrees Centigrade of said solution at the interior wall of each said pipe being controlled at
• 1000/(Y+1.15.times..sqroot.D),
• where D represents the internal diameter of said pipe in inches and Y represents a value equal to or greater than 5.4;
• and
• (c) extruding said solution through a die to form filaments which are coagulated, washed in water to remove said solvent and dried, thereby forming said solvent-spun cellulose fibre.

A method for the manufacture of solvent-spun cellulose fibre including the steps of:

• (a) forming a solution of cellulose in an aqueous N-methylmorpholine N-oxide solvent;
• (b) passing said solution through at least one pipe, the temperature in degrees Centigrade of said solution in the centre of each said pipe being controlled at
• 1000/(X+0.98.times..sqroot.D),
• and the temperature in degrees Centigrade of said solution at the interior wall of each said pipe being controlled at
• 1000/(X+1.15.times..sqroot.D),
• where D represents the internal diameter of said pipe in inches, X represents a value equal to or greater than 5.0, and Y represents a value equal to or greater than 5.4;
• and
• (c) extruding said solution through a die to form filaments which are coagulated, washed in water to remove said solvent and dried, thereby forming said solvent-spun cellulose fibre.