Patent ID: 6315806
Filing Date: 2001-11-13
Classification: B01D,D01D,D04H,Y10S

Abstract:
A composite fibrous web made in accordance with the method of:providing a two dimensional array of individually controlled fiber producing cells, said array having closely spaced, generally parallel rows of cells, said cells in the array defining a first plurality of cells and a remainder plurality of cells;producing a single jet spray of fluid containing entrained fibers from each cell in the array;controlling said first plurality of the cells in the array to produce discontinuous fibers containing a relatively high percentage of sub-micron diameter fibers;controlling the remainder plurality of cells in the array to produce sprays of fibers containing a relatively high percentage of fibers which have diameters greater than one micron;positioning the cells in the array so as to cause the fibers in neighboring sprays to collide in flight in a fiber formation region and to promote a fine scale entanglement of the sub-microne diameter fibers with the fibers which are larger than 1 micron in diameter; andcollecting the collided fibrous web on a collection surface.