caa a22 4500 463234340 CHVBK 20180405153252.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10853-006-1164-7 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1164-7 A novel nozzle design for producing hydroentangled nonwoven materials with minimum jet-mark defects [Elektronische Daten] [Nagendra Anantharamaiah, Katharina Römpert, Hooman Vahedi Tafreshi, Behnam Pourdeyhimi] The presence of jet-marks, or jet-streaks, on the surface of hydroentangled nonwoven fabrics, is usually regarded as an undesirable outcome of the hydroentangling process. Jet-streaks degrade aesthetic features and physical properties of the resulting fabrics. Jet-streaks are associated with low tear strength along the machine direction and non-uniform appearance. Reducing or eliminating the occurrence of jet-streaks will lead to increased use of this class of fabrics in many applications. Hydroentangling employs closely-packed single or multiple rows of high-speed waterjets to entangle and consolidate fibers or filaments in a loose (un-bonded) web. In this work, we demonstrated that a waterjet curtain made of two rows of staggered jets where the jets in the 2nd row are smaller in diameter than those in the 1st row can help minimize these jet-marks in a cost-effective manner. The optimal ratio between the diameter of the jets in the 1st and 2nd row depends on the hydroentangling pressure, as well as the web characteristics. In this study, different nozzle diameters ranging from 100μm to 130μm for the 2nd row were examined in combination with a fixed diameter of 130μm for the nozzles in the 1st row. For the type of fiber-web used and the operating pressures considered, a combination of nozzles with 130μm diameter in the 1st row, and nozzles with 110μm diameter in the 2nd row, was found to provide the optimum setting for eliminating/minimizing the jet-marks. Springer Science+Business Media, LLC, 2007 Anantharamaiah Nagendra Nonwovens Cooperative Research Center, North Carolina State University, 27695-8301, Raleigh, NC, USA aut Römpert Katharina Nonwovens Cooperative Research Center, North Carolina State University, 27695-8301, Raleigh, NC, USA aut Vahedi Tafreshi Hooman Nonwovens Cooperative Research Center, North Carolina State University, 27695-8301, Raleigh, NC, USA aut Pourdeyhimi Behnam Nonwovens Cooperative Research Center, North Carolina State University, 27695-8301, Raleigh, NC, USA aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6161-6170 0022-2461 42:15<6161 2007 42 10853 https://doi.org/10.1007/s10853-006-1164-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1164-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Anantharamaiah Nagendra Nonwovens Cooperative Research Center, North Carolina State University, 27695-8301, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Römpert Katharina Nonwovens Cooperative Research Center, North Carolina State University, 27695-8301, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Vahedi Tafreshi Hooman Nonwovens Cooperative Research Center, North Carolina State University, 27695-8301, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Pourdeyhimi Behnam Nonwovens Cooperative Research Center, North Carolina State University, 27695-8301, Raleigh, NC, USA aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6161-6170 0022-2461 42:15<6161 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer