Match Direction with Orientation of fibers on the web.\[\begin{array}{|l|l|} \hline \textbf{LIST I} & \textbf{LIST II} \\ \textbf{Direction} & \textbf{Orientation of fibers} \\ \hline \hline \text{A. Longitudinal orientation} & \text{I. Not oriented} \\ \hline \text{B. Transverse orientation} & \text{II. Fibres laid in machine} \\ \hline \text{direction and width-wise} \\ \hline \text{directions} \\ \hline \text{C. Cross directional web} & \text{III. Fibres laid in a machine} \\ \hline \text{direction} \\ \hline \text{D. Random oriented web} & \text{IV. Fibres laid in a width-wise} \\ \hline \text{direction} \\ \hline \end{array}\]
Step 1: Define fiber orientation terms for nonwoven webs.
- Longitudinal (Parallel-laid): Fibers primarily align with the machine direction (MD), common in carded webs.
- Transverse (Cross-laid): Fibers are mostly perpendicular to the machine direction (CD), achieved via cross-lapping.
- Cross directional web: Fibers are oriented in multiple directions, typically created by layering webs using a cross-lapper, providing strength in both MD and CD.
- Random oriented web: Fibers lack a preferred orientation, characteristic of airlaid or wetlaid processes.
Step 2: Pair terms from List I with descriptions from List II.
- A. Longitudinal orientation corresponds to III. Fibres laid in a machine direction.
- B. Transverse orientation corresponds to IV. Fibres laid in a width-wise direction.
- C. Cross directional web corresponds to II. Fibres laid in machine direction and width-wise directions, built by layering.
- D. Random oriented web corresponds to I. Not oriented.
Step 3: Compile the correct combination: A-III, B-IV, C-II, D-I. This is option (D).