Patent ID: 7217317
Filing Date: 2007-05-15
Classification: D01D,D01F

Abstract:
1. A method for safely conveying and handling a spinnable cellulose solution comprising cellulose, a solvent for cellulose, and a non-solvent for cellulose at a specified temperature range of from about 70° C. to about 100° C. in a device equipped with a tempering system, wherein the tempering system includes hot water, the method comprising: controlling heat dissipation from the spinnable cellulose solution in at least one sector of the device containing the spinnable cellulose solution when the temperature of the spinnable cellulose solution reaches or exceeds a switching point with a preset temperature value by providing a first and second switching point whereby the second switching point is set at a second preset temperature, which exceeds a first preset temperature of the first switching point, and wherein when the temperature of the spinnable cellulose solution has reached or exceeded the first switching point, the temperature of the hot water in the tempering system is reduced and if the temperature of the spinnable cellulose solution is not brought into the specified range of from about 70° C. to about 100° C. and the temperature of the spinnable cellulose solution has reached or exceeded the second switching point, an emergency cooling system of the tempering system is activated and an amount of up to all of the hot water in the tempering system is replaced with fresh water at a temperature to bring the spinning solution into the specified range of from about 70° C. to about 100° C., to prevent exothermic breakdown of the spinnable cellulose solution.