if the average micro length of the fibril is set somewhat below the micro length required to bridge across the cell then the cell 39 s openings will be caused to remain unobstructed due to the absence of fibril bridging referring still to fig1 the layer 40 of fibrils 30 is formed on and adheres to a conveyor belt 50 at first end 55 of the conveyor belt 50 in a preferred embodiment the conveyor belt 50 may comprise a porous medium so a vacuum 52 may cause suction therethrough the conveyor belt 50 may be made of woven cloth woven metallic wires woven polymeric strands nickel deposited screens etch screens and the like the layer 40 of fibrils 30 is held on the surface of the conveyor belt 50 by suction of the vacuum 52 and is transported along the vacuum conveyor belt 50 to a second end 58 of the conveyor belt 50 where an extrusion slot die 60 of a first extruder 62 releases lower temperature polymer melt 70 the lower temperature polymer melt 70 preferably is a polymer web the polymer web is comprised of a polymer including but not limited to polyethylene polypropylene eva ema and copolymers thereof polyethylene is a preferred component of the.