In the world of textiles, carding is a mechanical process that disentangles, cleans, and intermixes fibers (like wool or cotton) to produce a continuous web or sliver suitable for subsequent processing.
Cut an 8.5" x 11" sheet in half at 5.5" to create two 5.5" x 8.5" pieces. When folded, these become A2 cards. Cutting 12x12 Paper:
: These look like oversized hairbrushes with wire teeth. Traditional artisans use two of them to brush the wool between each other.