Wet spinning vacuum freeze-drying method and drying equipment

Abstract

The invention provides a wet spinning vacuum freeze-drying method and drying equipment. The method includes the steps that (1), fibers of wet spinning are directly put in a vacuum drying bin to be freeze-dried, the fibers are completely frozen, and a next step is carried out; (2), plate layers start to be heated, meanwhile, vacuumizing is carried out, the vacuum degree in the vacuum drying bin iswithin the range of 10 pa-800 pa, meanwhile, the temperatures of plates are controlled to be 30-120 DEG C and reach 0 DEG C or above, and the fibers are dried. A feed port and a discharge port of thevacuum drying bin are formed in the two ends respectively, a guide rail in the bin is arranged on the top in a bin body, the two ends of the guide rail in the bin are connected with a guide rail outside the bin through pneumatic connecting devices respectively to form an annular guide rail, and a lifting yarn arranging table is arranged below the portion, close to feed port of the vacuum freeze-drying bin, of the guide rail outside the bin. In the wet spinning process, industrialized fiber dewatering and drying can be carried out without pre-freezing or any organic solvent, and continuous drying production of long fibers can be achieved.

Description

Technical field [0001] The invention belongs to the technical field of spinning, and relates to a fiber drying equipment and a drying method in a wet spinning process, in particular to a wet spinning vacuum freeze-drying method and drying equipment. Background technique [0002] At present, in the production process of wet spinning, the wet fiber after washing or purification is generally immersed in an organic solvent, such as alcohol, acetone, etc. After a certain period of time, the residual liquid in the fiber is centrifuged or squeezed for dehydration. , Dry by natural drying or drying. The purpose is to replace the moisture in the nascent fiber and arrange the internal structure of the fiber in an orderly manner to increase the strength of the fiber. However, the production method of organic solvent dehydration requires a large amount of organic solvents to be used in the production process, and the production cost is high, and explosion-proof equipment is required for pro...

AI Technical Summary

Problems solved by technology

However, using the production method of organic solvent dehydration, a large amount of organic solvents are used in the production process, the production cost is high, explosion-proof equipment is required for production, and the production plant is also required to be a Class A workshop

[0003] When the fiber is soaked in an organic solvent, generally a certain length of fiber is soaked in the solvent in batches, and the method of manually putting in and taking out the dehydration is adopted. The process of sub-soaking solution, dehydration, oiling, dehydration, drying or drying has problems such as long soaking time, complicated production operation, large number of workers and the use of a large number of organic solvents to increase the danger in the production process.

[0004] Conventional fiber drying methods usually use hot air drying, vacuum drying and microwave drying, etc., but the fibers after these drying methods are prone to parallel filaments, low fiber strength and elongation, and hard hand feeling, especially alginic acid. fiber and chitosan fiber this phenomenon is more obvious

[0005] Chinese invention patent (ZL2015104720101) discloses a vacuum freeze-drying method of chitin fiber or chitosan fiber. The patent method describes that the wet chitosan fiber is placed in the refrigerator for pre-freezing, and then placed in a vacuum The drying equipment is dried by controlling the vacuum degree. This method requires that the wet chitosan fiber should be pre-frozen in the refrigerator and then placed in the vacuum drying chamber. The fiber should be transferred between the two sets of equipment. The operation method is complicated and not suitable for Industrial mass production

In addition, the frozen solid fiber only draws out the sublimated water vapor through continuous vacuuming in the vacuum equipment, and does not give heat to the frozen solid material. The sublimation process is slow and the drying time is long.

And, also do not propose improvement and design to existing vacuum freeze-drying equipment in the above-mentioned patent

[0006] The existing vacuum freeze-drying equipment is mainly used for drying processing of food or medicine, and is not suitable for the continuous drying production of long fiber bundles; in addition, the feeding and discharging of the vacuum freeze-drying equipment are at the same warehouse door, and the drying process before drying Both fiber and dried fiber are in the same workshop

Usually, the workshop where the fiber is located before drying has high humidity, and the cleanliness cannot meet the processing conditions of the dried fiber.

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