Abstract: A meltblowing apparatus includes a die having a triangular nosepiece with a plurality of orifices at the apex of the nosepiece; a pair of air chambers positioned on both sides of the die; converging air passages formed on each side of the nosepiece; a plurality of holes interconnecting each air chamber with its associated air passage; and an air flow deflector in each flow passage.

Abstract: A die tip of a meltblowing die is mounted on the die body to provide a residual compressive force in the die tip nosepiece thereby resisting internal extrusion pressures.

Abstract: A meltblowing collector screen includes a vacuum pump and internal partitions for achieving substantially uniform air flow through the length of the screen thereby producing a web of uniform thickness.

Abstract: A metal block melt blowing die has paired longitudinal grooves within its bottom surface adjacent a triangular cross section die tip nose. A series of vertical circular bores within the body opening to the grooves support cartridge heaters sized to the bores permitting rod penetration into the bores from either end for removing wedged cartridge heaters. The grooves carry upper and lower air deflector blocks which are spaced from each other to form a tortuous air passage therebetween for insuring turbulence to the attenuating air streams passing therethrough and between laterally and vertically adjustable air plates for varying the air gap between the ends of the air plates at the bottoms of the grooves and the die tip nose and the velocity of the air streams converging at the die tip extrusion holes. A rectangular frame carries unitary diametrically opposed mounting blocks within the rectangular frame with cylindrical air manifolds on respective sides thereof. The die mounts at its ends to the blocks.