Question

To prevent the growth of microorganisms, \(\underline{\hspace{2cm}}\) is added to the size paste.

• A. Adhesive material
• B. Softener
• C. Antistatic agent
• D. Antiseptic agent

Hint:

Break down the components of a size paste by function: - Adhesive: The "glue" (starch, PVA). - Lubricant/Softener: For flexibility (oils, waxes). - Antiseptic: To prevent spoilage/mildew. - Antistat: To reduce static.

Answer 1

The Correct Option is D

Step 1: Understand the purpose of the additive. The goal is to "prevent the growth of microorganisms" (like bacteria, mildew, or fungi) in the size paste. Size pastes, often containing natural starches, are nutrient-rich environments for these organisms.

Step 2: Evaluate the options based on their function.
- Adhesive material: This is the main component of the size paste (e.g., starch, PVA), which provides strength and abrasion resistance to the yarn. It does not prevent microbial growth; it encourages it.
- Softener: Additives like fats, oils, and waxes are used to make the sized yarn more flexible and less brittle.
- Antistatic agent: This is used to reduce the build-up of static electricity during processing, especially with synthetic fibers.
- Antiseptic agent (or biocide/fungicide): This is a chemical added specifically to kill or inhibit the growth of microorganisms. Conclusion: An antiseptic agent is the correct additive to prevent the growth of microorganisms in the size paste.