New approach to the meltblown-paradox / Christopher Bruns in CHEMICAL FIBERS INTERNATIONAL, Vol. 71, N° 4 (12/2021)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > Vol. 71, N° 4 (12/2021) . - p. 181-183 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 Kàrmaàn 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 [article]

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New approach to the meltblown-paradox / Christopher Bruns in CHEMICAL FIBERS INTERNATIONAL, (10/2022)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > (10/2022) . - p. 62-64 Titre : New approach to the meltblown-paradox Type de document : texte imprimé Auteurs : Christopher Bruns, Auteur ; Axel Nickel, Auteur Année de publication : 2022 Article en page(s) : p. 62-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Procédé de fusion-soufflage (nontissés) Index. décimale : 677.6 Tissus obtenus par des procédés spéciaux, quelle que soit leur composition : jacquard, feutres tissés et non tissés, tapisseries, tissus ajourés 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 "Exxon-process". Note de contenu : - Determination of the flow velocities of the primary air - Formation of a Karman vortex street - High-speed video recording and sound pressure measurement - Fig. 1 : Meltblown process and enalrgement process on the basis of the filament forces acting 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 side view (x-y) and the front view (x-z) En ligne : https://drive.google.com/file/d/1F1zI1Aaz0MdGO9C1TtVT5md6zKKs9kAu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38412 [article]

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