Abstract: A metblowing die designed to efficiently receive a preassembled die tip assembly is described. The die assembly includes a die body (19) mounted on a meltblowing machine and a replaceable die tip assembly (20). The die tip assembly (20) includes a mounting block (25), to which are mounted a die tip (26) and air knives (27, 28) on opposite sides or the die tip (26). The positions of the air knives (27, 28) are adjustable to set air gap and set back parameters important in proper operation. The die tip assembly (20) is moved into and out of the die body (19) after air knife adjustment permitting adjustment to be made with the die tip assembly (20) off the machine, allowing rapid replacement. The replacement die tip assembly (20) is preheated, permitting replacement while the die body (19) is still hot.

Abstract: A meltblowing die designed to efficiently receive a preassembled die tip assembly is described. The die assembly includes a die body mounted on a meltblowing machine and a replaceable die tip assembly. The die tip assembly includes a mounting block, to which are mounted a die tip and air knives on opposite sides of the die tip. The positions of the air knives are adjustable to set air gap and set back parameters important in proper operation. The die tip assembly is moved into and out of the die body after air knife adjustment, permitting the adjustment to be made with the die tip assembly off the machine, and allowing rapid replacement. The replacement die tip assembly is preheated, permitting replacement while the die body is still hot.

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.

Abstract: A process for producing a non-woven web of thermoplastic polymer fibers comprises extruding a thermoplastic polymer through a series of die openings while passing a stream of hot gas from both sides of the die openings to impinge and attenuate the molten extruded resin fibers, wherein the gas is passed through a plurality of flow distribution holes and through a flow detector to intermix gas jets discharging from the holes.