precipitating bath, and process using the same

摘要

A precipitating bath (4) for holding a coagulation liquid for the precipitation of shaped bodies formed from a spinning solution has a bottom and at least one precipitating bath discharge nozzle (10) mounted in the bottom, the at least one discharge nozzle having an intake port and opposite it a discharge port for the passage therethrough of the shaped bodies formed from the spinning solution, the bath also having at least one inlet for the coagulation liquid (4) and at least one outlet for the coagulation liquid. The precipitating bath (4) is characterised in that it has a cover sheet (6) with at least one hole for holding the at least one precipitating bath discharge nozzle (10), the cover sheet (6) being positioned above the at least one inlet for the coagulation liquid and beneath at least one outlet for the coagulation liquid, and in that the at least one precipitating bath discharge nozzle (10) in the at least one hole in the cover sheet is arranged such that one or more orifices are formed in the cover sheet (6) in a ring around the at least one precipitating bath discharge nozzle (10). A process for the preparation of cellulosic shaped bodies is provided in which process an extruded solution of cellulose in a tertiary amine N-oxide and, optionally, water is introduced into a coagulation liquid, for example in such a precipitating bath, for coagulation, wherein during the precipitation the coagulation liquid flows in countercurrent to the direction of movement of the shaped solution, at least in the region of the inlet of the shaped solution into the coagulation liquid.