Question

Which one of the following is a regenerated protein fibre?

• A. Viscose
• B. Casein
• C. Cuprammonium rayon
• D. Cellulose acetate

Hint:

Remember the key difference: regenerated fibers use natural polymers, but require significant chemical processing to form fibers. Casein (milk protein) and azlon (soybean, peanut, or corn protein) are the main examples of regenerated protein fibers.

Answer 1

The Correct Option is B

Step 1: Understanding Fiber Classifications: Fibers can be classified as natural or manufactured. Manufactured fibers are further divided into regenerated and synthetic. Regenerated fibers are made from naturally occurring polymers that are not inherently fiber-forming and require chemical processing. Protein fibers are a subcategory of natural fibers, but regenerated protein fibers are manufactured.
Step 2: Identifying the Options: Viscose: Viscose is a regenerated cellulose fiber, made from wood pulp. Casein: Casein fiber is a regenerated protein fiber, made from milk protein. Cuprammonium rayon: Cuprammonium rayon is a regenerated cellulose fiber. Cellulose acetate: Cellulose acetate is a modified cellulose fiber (a derivative of cellulose, but not strictly regenerated).
Step 3: The Correct Answer: Only casein is made from a protein source. The others are derived from cellulose.