Production of Acrylic
Some acrylic fibers are dry- or solvent-spun and others are wet-spun. In dry spinning, the polymers are dissolved in a suitable solvent, such as dimethyl
formamide, extruded into warm air, and solidified by evaporation of the solvent. After scpinning, the fibers are stretched hot, 3 to 10 times their original length, crimped, and marketed as cut staple or tow. In wet spinning, the polymer is dissolved in solvent, extruded into a coagulating bath, dried, crimped, and collected as tow for use in the high-bulk process or cut into staple and baled.