METHOD FOR MEASUREMENT OF SPECKLES IN SPINNING UNDILUTED SOLUTION

PROBLEM TO BE SOLVED: To detect very small local speckles, especially viscous speckles, in a spinning undiluted solution by the method wherein the spinning undiluted solution which is filtered by a filter whose pore size is smaller than that of a spinning pore diameter is discharged from a capillary whose pore diameter is nearly identical to the spinning hole diameter, a pressure change is detected and the scattering of a laser beam is detected. SOLUTION: A spinning undiluted solution is filtered by a filter 4 whose pore size is smaller than a spinning pore diameter and which uses, e.g. a nonwoven fabric, and dust particles other than very small gellike substances which cause viscous speckles in the spinning undiluted solution are removed. Its filtrate is pressurized by using a gear pump 5 which is driven by, e.g. a servomotor 10, it is sent to a capillary 12, and a pressure change which is generated according to the viscous speckles in the filtrate is measured by a pressure sensor 11. The pore diameter of the capillary is required to be equal to the spinning pore diameter, and it is preferably 50 to 2000 μm. In addition, the very small gellike substances have a size of about 100 μm, and they can be grasped quantitatively in such a way that a filtrate by a filter which is equal to the filter 4 is irradiated with a laser beam and that its scattering is analyzed.