Efficient cleaning method of spinneret special for dry-spraying and wet-spinning of polyacrylonitrile-based carbon fiber

Abstract

The invention discloses an efficient cleaning method of a spinneret plate special for polyacrylonitrile-based carbon fiber dry-jet wet spinning. The method comprises the steps that 1, spinning nozzlesare disassembled on site, and the spinneret plate to be cleaned is taken down; 2, the spinneret plate is placed in cleaning liquid and subjected to physical oscillation cleaning; 3, the spinneret plate after physical oscillation cleaning is washed for 5 minutes or above till no impurity exists on the surface of the spinneret plate; 4, the washed spinneret plate is placed into an ultrasonic cleaning device to be subjected to ultrasonic cleaning; 5, pure compression air is used for blowing and sweeping the spinneret plate after ultrasonic cleaning till no drops exist in spinning holes; 6, the spinneret plate after blowing and sweeping is put in a drying oven to be dried and then cooled; 7, whether or not whole cleaning of the cooled spinneret plate is qualified is detected, if yes, cleaningis ended, and if not, the steps of 2 to 7 are repeated till cleaning is qualified. The efficient cleaning method of the spinneret plate special for polyacrylonitrile-based carbon fiber dry-jet wet spinning makes the cleaning cleanliness of the spinneret plate special for polyacrylonitrile-based carbon fiber dry-jet wet spinning higher, the time shorter and the efficiency higher.

Description

technical field [0001] The application belongs to the technical field of spinneret cleaning in the chemical fiber manufacturing industry, and in particular relates to a high-efficiency cleaning method for a spinneret special for dry-jet wet spinning of polyacrylonitrile-based carbon fibers. Background technique [0002] The thickness of the spinneret for polyacrylonitrile-based carbon fiber dry-jet wet spinning is about 8-10mm, which is much thicker than wet spinning; the aperture is small, generally 0.10-0.15mm; Viscosity, high solid content spinning solution; in order to reduce the outlet expansion effect, the design value of the length-to-diameter ratio of the spinneret is relatively large (2~4); at the same time, the polyacrylonitrile-based carbon fiber dry-jet wet spinning production process is clean for the spinneret The accuracy requirements are very high (there is no plugged hole in the visual inspection, and the qualified rate of the instrument inspection is above 9...

AI Technical Summary

Problems solved by technology

[0004] The flash point of dimethyl sulfoxide is 95°C. It has certain volatility and will decompose at high temperature. Therefore, when using dimethyl sulfoxide as a solvent to clean the spinneret, the temperature is generally below 90°C. Under the circumstances, adopting the existing cleaning method of soaking or soaking with a certain amount of rotation, not only the cleaning time is long, but also the pass rate is very low, which seriously restricts the production of raw silk; and if the production of raw silk is to be guaranteed, a large number of spinnerets must be Procurement, spinneret cleaning equipment must also be increased, which will increase a lot of extra costs, so an efficient method for cleaning the spinneret is very necessary

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