abstract |
Apparatus for continuously making a tube of melt blown microfibers. The tubes are useful as filter elements. Melt blown microfibers deposited longitudinally upon a circumferential surface of a mandrel are axially withdrawn from one end of the mandrel tube. Weight is controlled by the rate at which a tube is drawn from a mandrel, the rate at which microfibers are deposited on the mandrel, the rate at which the mandrel revolves, and the like. |