Properties and Production of Fibers

The video tutorial provides an in-depth exploration of regenerated fibers, focusing on their history, types, properties, and applications. It covers various fibers such as viscose rayon, cupramonium rayon, high wet modulus rayon, cellulose acetate, and protein fibers. The manufacturing processes and characteristics of these fibers are discussed, highlighting their significance in the textile industry.

What was the main challenge in creating the first man-made fibers?

• Finding a way to dye the fibers

• Finding a way to dissolve cellulose

• Finding suitable raw materials

• Creating synthetic polymers

Which country first invented viscose rayon?

• United States

• United Kingdom

• Germany

• France

What is the specific gravity of viscose rayon?

• 1.78 grams per cubic centimeter

• 1.30 grams per cubic centimeter

• 1.50 grams per cubic centimeter

• 1.54 grams per cubic centimeter

What is cupramonium rayon also known as?

• Viscose

• Modal

• Cupro

• Lyocell

Which of the following is a property of high wet modulus rayons?

• Low tenacity

• Low resistance to alkalis

• High degree of swelling

• High initial wet modulus

What is the moisture regain of cellulose acetate fibers under standard conditions?

• 13%

• 14%

• 12%

• 6.5%

Which protein fiber is commercially produced from skimmed milk?

• Zine

• Archan

• Casein

• Soybean

What is the most valuable property of alginate fibers?

• High moisture regain

• Elasticity

• Non-flammability

• High strength

What is the specific gravity range of natural rubber fibers?

• 1.30 to 1.50

• 1.50 to 1.78

• 1.78 to 2.00

• 0.96 to 1.06

What is the first step in the manufacturing process of viscose rayon?

• Shredding the alkali cellulose

• Steeping wood pulp in caustic soda

• Aging the white crumbs

• Treating with carbon disulfide