Question

Match Direction with Orientation of fibers on the web.\[\begin{array}{|l|l|} \hline \textbf{LIST I} & \textbf{LIST II} \\ \textbf{Direction} & \textbf{Orientation of fibers} \\ \hline \hline \text{A. Longitudinal orientation} & \text{I. Not oriented} \\ \hline \text{B. Transverse orientation} & \text{II. Fibres laid in machine} \\ \hline \text{direction and width-wise} \\ \hline \text{directions} \\ \hline \text{C. Cross directional web} & \text{III. Fibres laid in a machine} \\ \hline \text{direction} \\ \hline \text{D. Random oriented web} & \text{IV. Fibres laid in a width-wise} \\ \hline \text{direction} \\ \hline \end{array}\]

• A. A - IV, B - I, C - III, D - II
• B. A - II, B - III, C - I, D - IV
• C. A - I, B - II, C - IV, D - III
• D. A - III, B - IV, C - II, D - I"

Hint:

Think of the directions on a map: - Longitudinal = North-South (Machine Direction). - Transverse = East-West (Cross Direction). - Cross = Both N-S and E-W layers. - Random = No specific direction.

Answer 1

The Correct Option is D

Step 1: Define the terms for fiber orientation in a nonwoven web.
- Longitudinal orientation (or Parallel-laid): Most fibers are aligned in the direction of the machine's travel (Machine Direction, MD). This is typical for a standard carded web.
- Transverse orientation (or Cross-laid): Most fibers are aligned perpendicular to the machine direction (Cross Direction, CD). This is achieved by cross-lapping.
- Cross directional web: This implies a web with fibers laid in multiple directions, typically achieved by layering webs using a cross-lapper. This gives strength in both MD and CD.
- Random oriented web: Fibers are laid without any preferred orientation. This is typical for airlaid or wetlaid processes.

Step 2: Match the terms in List I with the descriptions in List II.
- A. Longitudinal orientation matches with III. Fibres laid in a machine direction.
- B. Transverse orientation matches with IV. Fibres laid in a width-wise direction.
- C. Cross directional web matches with II. Fibres laid in machine direction and width-wise directions, as it's built up by layering.
- D. Random oriented web matches with I. Not oriented.

Step 3: Assemble the correct combination. The matching is A-III, B-IV, C-II, D-I. This corresponds to option (D).