Method and device for producing substantially endless fine threads
OwnerLuder Gerkinginventor
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Abstract
The invention relates to a method and a device for producing substantially endless fine threads from polymer solutions, especially spinning material for lyocell, wherein the spinning material is spun from at least one spinning hole or a spinning slot. The spun thread or film is drawn by high-speed accelerated gas flows using a Laval nozzle whose narrowest cross-section is located beneath the point where the spinning material exists. The threads are arranged on a strip in the form of a non-woven or are taken up in the form of a yarn and are subsequently separated in spinning baths by means of solvents.
Claims11
A method for producing endless fine threads from a spinning material made of cellulose dissolved in a solvent, in which the dissolved cellulose is spun from at least one spinning orifice and the spun thread is drawn by gas flows which are constantly accelerated to a high speed by means of a Laval nozzle, the gas flow in the region of the fiber formation being substantially laminar, at least one of the temperature of the spinning material, the temperature of the thread exiting from the spinning orifice, the pressure before the Laval nozzle and the pressure after the Laval nozzle is controlled such that the thread reaches a pressure in its interior before solidifying which is greater than the gas pressure surrounding it, in such a manner that the thread splits and fans out into a multiplicity of fine threads, whereby in the drawing region water or steam is injected in order to start coagulation.
Dependencies are inferred from the claim text.