US 11,992,991 B2
Nozzle for making meltblown filaments
Hans-Georg Geus, Niederkassel (DE); Raphael Hermes, Niederkassel (DE); Markus Jansen, Monheim am Rhein (DE); Norbert Terlau, Bergisch Gladbach (DE); and Markus Wuescht, Rheinbach (DE)
Assigned to REIFENHAEUSER GMBH & CO. KG MASCHINENFABRIK, Troisdorf (DE)
Filed by Hans-Georg Geus, Niederkassel (DE); Raphael Hermes, Niederkassel (DE); Markus Jansen, Monheim am Rhein (DE); Norbert Terlau, Bergisch Gladbach (DE); and Markus Wuescht, Rheinbach (DE)
Filed on Jul. 18, 2022, as Appl. No. 17/867,340.
Prior Publication US 2023/0021972 A1, Jan. 26, 2023
Int. Cl. B29C 48/345 (2019.01); B29C 48/05 (2019.01); D01D 4/02 (2006.01); D01D 5/098 (2006.01); D04H 1/56 (2006.01); B29L 31/00 (2006.01)
CPC B29C 48/345 (2019.02) [B29C 48/05 (2019.02); D01D 4/025 (2013.01); D01D 5/0985 (2013.01); D04H 1/565 (2013.01); B29L 2031/726 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An apparatus for making filaments, the apparatus comprising:
a nozzle having
a face extending in a longitudinal direction and transversely thereto in a transverse direction and
an array of melt openings and compressed-air openings on the face in a plurality of longitudinally extending rows and a plurality of transversely extending rows, between 12% and 45% of the melt and compressed-air openings being melt openings and the balance being compressed-air openings; and
means for supplying a polymer melt to the melt openings to extrude the polymer melt downstream from the melt openings as polymer filaments and for supplying compressed air to the compressed-air openings to form air jets issuing downstream from the compressed-air openings between the polymer filaments.
 
15. An apparatus for making filaments, the apparatus comprising:
a nozzle having a face extending in a longitudinal direction and transversely thereto in a transverse direction, the nozzle having melt openings and compressed-air openings on the face in a plurality of longitudinally extending rows and a plurality of transversely extending rows, all of the openings of alternate longitudinal rows being compressed-air openings and at least some of the openings of the longitudinal rows between the longitudinal rows wholly of compressed-air openings being melt openings, the melt openings in each of the longitudinal rows between the longitudinal rows wholly of compressed-air openings being separated longitudinally from one another by compressed-air openings; and
means for supplying a polymer melt to the nozzle openings to extrude the polymer melt downstream from the melt openings as polymer filaments and for supplying compressed air to the compressed-air openings to form air jets issuing downstream from the compressed-air openings between the polymer filaments.