Question

In which of the following web laying techniques, high loft structures can be produced?

• A. Polymer laid
• B. Card laid
• C. Water laid
• D. Air laid

Hint:

Air laying produces the loftiest nonwoven webs due to the random, 3D fiber arrangement created by suspending fibers in air.

Answer 1

The Correct Option is D

Step 1: Understanding Web Laying Techniques: Web laying is the process of forming a sheet of fibers (a web) from loose fibers or a polymer solution. This is the first 
Step in nonwoven manufacturing. 
Step 2: Analyzing the Options: Polymer Laid (Spunbond/Meltblown): These processes directly extrude polymer filaments to form a web. They tend to produce relatively dense, flat structures, not high loft. 
Card Laid: Fibers are aligned and formed into a web using a carding machine (similar to yarn spinning). Carded webs can have some loft, but are generally not as lofty as air-laid webs. 
Water Laid (Wet Laid): Fibers are dispersed in water and then deposited onto a forming wire, similar to papermaking. Wet-laid webs are typically dense and uniform, not high loft. 
Air Laid: Fibers are suspended in an air stream and then deposited onto a forming surface. This process creates a random, three-dimensional fiber arrangement with a high degree of bulk and loft. The air pockets between the fibers contribute to the loft.