3.2 .3 Manufacturing Process: By using different chemicals and manufacturing techniques, two basic types of rayon were developed. They were viscose rayon and cuprammonium rayon. Viscose rayon can have more names like standard viscose, regular viscose and high wet modulus rayon, Wet Spinning Dry Spinning Melt Spinning depending on the changes made to get different qualities. Schweitzer in 1857 dissolved in an alkaline copper solution. In 1890, Despeisse developed a method to make a filament.

(a) 10th (b) 20th (c) 16th (d) 19th 2. Artificial silk is (a) rayon (b) polyester (c) acrylic (d) acetate 3. Nylon is a fabric whose filaments are prepared from (a) melt spinning (b) dry spinning (c) wet spinning (d) blow spinning 4. The main difference between acetate and triacetate is (a) ageing (b) acetone/methyline chloride (c) hydrolysis (d) all of these 5. Polyester is referred as (a) dupont (b) work horse (c) cellulose acetate (d) acrylic Answer in one or two words: 1. Name any two synthetic fibers.