Titre : |
New approach to the meltblown-paradox |
Type de document : |
texte imprimé |
Auteurs : |
Christopher Bruns, Auteur ; Axel Nickel, Auteur |
Année de publication : |
2021 |
Article en page(s) : |
p. 181-183 |
Langues : |
Anglais (eng) |
Catégories : |
Analyse spectrale Procédé de fusion-soufflage (nontissés) Procédés de fabrication par voie fondue (nontissés)
|
Index. décimale : |
677 Textiles |
Résumé : |
The meltblown process was developed 70 years ago by petrochemical company ExxonMobil Chemical Co., Houston, TX/USA. Nevertheless, there is still no common understanding among experts as to how the very fine filament diameters in the range of a few micrometers (pm) are produced. The existing air velocities in the subsonic range are in any case not sufficient to explain the filament velocities of up to several km/s that are necessary to achieve such fine filaments. This paper will present a new approach that Fiber-To-Go is pursuing. It is already known that there must be a "post-stretching". However, the cause of this phenomenon has not yet been clarified. The authors assume a high-frequency oscillation of the filaments caused by the merging of the 2 air streams at the nozzle tip during the "Doon-process". |
Note de contenu : |
- Determination of the flow velocities of the primary air
- Formation of a Kà rmaà n vortex street
- High-speed video recording and sound pressure measurement
- Fig. 1 : Meltblown process and enlargement process on the basis of the filament forces act-ing in the primary air stream, using the Exxon process
- Fig. 2 : Velocity distribution of the primary air and the corresponding measurement and simulation curves of the velocities below the nozzle
- Fig. 3 : Oscillation pattern of the filaments in the ride view (x-y) and the front view (x-z)
- Fig. 4 : Spectral analysis of the measurement results from the 10 microphone measurement using the example of 3 different operating points |
En ligne : |
https://drive.google.com/file/d/1Qk-rNBrAXkzMfQjhlT7zkot3Dtq_XmfF/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36961 |
in CHEMICAL FIBERS INTERNATIONAL > Vol. 71, N° 4 (12/2021) . - p. 181-183