Research On The Properties Of Cellulose Diacetate Filaments Based On Different Flying Quatities

Cellulose diacetate was the second category of regenerated cellulose fiber which was behind of viscose acetal fiber. Cellulose diacetate has been used in cigarette filter industry due to numerous advantages such as odorless, excellent moisture absorption, non-toxic and perfect filtering function. According to the actual condition of factory production and the application of cellulose diacetate filaments, there are many short fibers and fiber crumbs exfoliated from the fiber body, which can be called flying. Flying can increase the burden of filaments opening and filter stick formation. The solution pores and cling fibers existed on the surface of the cellulose diacetate filaments will apparently affect the strength and quality of filaments. Flying is one of the most important indicators to evaluate the quality of the cellulose diacetate filaments.A systematic analysis of shape and dimension, fibrillation, surface property, internal structure and component, mechanical property, and thermal property was made to compare the effect of different flying quantity on cellulose diacetate filament. The cause of flying formation and influence factors were concluded in the following four areas, according to this systematic analysis.1. Shape, dimension and fibrillation of cellulose diacetate filamentCellulose diacetate would create more flying when suffered extra external force because of the uneven fiber fineness. Unevenness of textile strands was affected by fiber crimpness and fineness. With the flying quantity increasing, the unevenness of filaments decreased. Besides that, delustering agents were widely distributed in filament. Granulated gel formed by delustering agent would be the weak area of cellulose diacetate. Flying would be formed when cellulose diacetate was damaged. Moreover, fibrillation was not the reason of flying according to that fibril have not been founded in the long-time frictional process in wet condition2. Surface properties of cellulose diacetate filamentRoughness of cellulose diacetate was influenced by forces of conveying rolls and pressure plates, the temperature of heat treatment, and the distribution of delustering agent and spinning oil in friction area. Flying would increased with the raised fiber friction belt.92oC was the best tube temperature which can reduce the flying quality through the appropriate speed of solvent evaporation and kinematic viscosity of spinning oil.The surface of cellulose diacetate was covered by spinning oil completely, which could reduce the damage of fiber. The change of surface elements and roughness would increase surface property and flying quality.The internal stracture and component of cellulose diacetate3. Internal structure and component of cellulose diacetate filamentFlying quantity would increase when wave number of Hydroxyl groups reduced Enthalpy of Fusion would be affected by crystallinity degree and catalog of crystal face. The abnormal peak of No.6C element in NMR was also the cause of flying explosion.4. Mechanical and thermal properties of cellulose diacetate filamentFiber debris would produce in lower initial modulus cellulose diacetate. Chopped fiber would turn up in lower viscoelastic cellulose diacetate. Flying increased with the raised crimpness in the same raw material condition. At the same time, it is verified that flying was affected by external extrusion and heat setting processes.Fiber macromolecuies would move more easily with the lower melting enthalpy. Fiber debris and chopped fiber would produce easily in the production process of cellulose diacetate. With the increasing content of delustering agent, the more granulated gel would appeared in celllulose deacetate. Flying quatity would growth in the easily vulnerable cellulose diacetate fiber.