Question

The ingredient that is NOT used in sizing formulations is

• A. Starch
• B. Polyvinyl acetate
• C. Polyvinyl alcohol
• D. Polycarbonate

Hint:

Sizing formulations primarily use starch, polyvinyl acetate, and polyvinyl alcohol for their properties that enhance the strength and smoothness of yarn during weaving. Polycarbonate is not used for sizing purposes.

Answer 1

The Correct Option is D

Sizing formulations are essential in the textile industry, as they are used to treat yarns and fibres during the weaving process to improve their strength, smoothness, and durability. The primary purpose of sizing is to reduce the breakage of yarn during the weaving process and to ensure smoother and more efficient operation of looms. Sizing agents are typically substances that provide a protective coating to the yarn or fibre, which helps in reducing friction and enhancing the mechanical properties of the fibres.
- Starch is one of the most commonly used ingredients in sizing formulations. It provides a coating that strengthens the yarn and helps in preventing breakage during the weaving process. It also imparts a smooth finish to the yarn.
- Polyvinyl acetate is another important ingredient in sizing formulations. It is a synthetic polymer that provides a good balance of strength and flexibility. Polyvinyl acetate helps improve the yarn's durability and resistance to wear.
- Polyvinyl alcohol is a water-soluble polymer often used in sizing formulations, especially for synthetic fibres. It helps improve the strength and handle of the yarn and prevents fraying and breakage during weaving.
- Polycarbonate, however, is not typically used in sizing formulations. Polycarbonate is a strong, durable plastic, but it is not suitable for the purposes of sizing, as it does not provide the necessary properties of flexibility, adhesion, and moisture resistance that are required in textile sizing formulations. It is more commonly used in applications where high impact strength and optical clarity are required, such as in the manufacturing of eyewear lenses and electronic components.
Thus, the correct answer is:
\[ \boxed{\text{(D) Polycarbonate}}. \]