Katarzyna Landsberg-Polubok (asker) Jan 12, 2006:

(...) These fibers, called slit (or split) film or tapes, are made from a continuous sheet of polymer that is cut into fibers by knives or lanced by air jets. The resulting ribbonlike fibers are referred to as slit film monofilament fibers. Obviously, these fibers can be twisted together to make a slit film multifilament.