Spinning chamber

Ambient conditions include factors such as humidity and temperature, air velocity in the spinning chamber, and atmospheric pressure. Humidity primarily controls the formation of pores on the surface of the fibers. Above a certain threshold level of humidity, pores begin to appear and, as the level increases, so do the number and size of the pores. 

In the commercial manufacture of Teviron, where the above characteristics are taken into consideration, the slurry is dissolved continuously under heating in a closed vessel and, after filtration, it is rapidly cooled down to the temperature of the boiling point of the mixed solvent and extruded from the spinneret while it still has a low viscosity. The spinning chamber is a cylindrical chimney, heated outside by a steam jacket. 

Condense-spinning For more advantage in drying efficiency, solvent recovery, and energy efficiency, the condense-spinning process is employed as a drying method [152]. This method is safe because the gas concentration in the spinning chamber is intentionally fixed at a level... 

The heat-transfer effect in the spinning chamber and, consequently, the productivity is improved. 

Mixed solvent of acetone-carbon disulfide In manufacturing Rhovyl, PVC is dissolved into a mixed solvent of acetone-carbon disulfide and spun. The manufacturing system of Rhovyl and its spinning chamber are described in its patent [146] and explained in a paper by Cord [153]. 

In the spinning of Rhovyl, the spinning chamber and the solvent recovery process form a closed system, and each spinning position is independent. Because a large quantity of carbon disulfide is used, special attention must be paid to prevent accidents such as explosion. 

Spinning. Since PAN decomposes before melting, it is necessary to make a solution with a solvent such as dimethyl formamide in order to be able to spin the material into a fiber. The spinning operation is either dry spinning, where the solvent evaporates in a spinning chamber (Fig. 8.3 a) or wet spinning, where the fiber is piaced in a coagulating bath solution... 

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