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Transient response of slot coating flows of shear-thinning fluids to periodic disturbances / Semi Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)
[article]
Titre : Transient response of slot coating flows of shear-thinning fluids to periodic disturbances Type de document : texte imprimé Auteurs : Semi Lee, Auteur ; Jaewook Nam, Auteur Année de publication : 2017 Article en page(s) : p. 981-990 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cisaillement (mécanique)
Enduction par filière
Fluide de CarreauLe fluide de carreau est un type de fluide newtonien généralisé où la viscosité, dépend du taux de cisaillement.
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : Slot coating is a popular coating method, in which the film thickness is precisely controlled by adjusting the flow rate and production speed. When the coating flow undergoes small-scale disturbances generated by rotating elements such as motors, pumps, or uneven rolls, the downstream meniscus fluctuates, which causes film thickness variation in the flow direction. Although most coating liquids including polymeric and particulate solutions exhibit a shear-thinning rheological property, their effect on transient coating flow behaviors is not deeply understood. Here, the effect of shear-thinning property on film thickness variation under different disturbances is investigated using a computer-aided analysis of transient slot coating flow. In this study, the Carreau model is used to describe the shear-thinning property, and four different disturbances are considered. Note de contenu : - Governing equations and boundary conditions
- Material properties and operating conditions
- Results and discussion : Disturbance strongly sensitive to the shear-thinning property : the coating gap - Disturbance weakly sensitive to the shear-thinning property
- Final remarks
- Appendix : Development of the parabolic velocity profile for carreau fluids - Dependence of film thickness variation on the upstream bead size under vacuum disturbanceDOI : 10.1007/s11998-017-9952-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9952-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29127
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 5 (09/2017) . - p. 981-990[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19230 - Périodique Bibliothèque principale Documentaires Disponible Transient swell of a high density polyethylene using adjustable gap slit die / V. K. Konaganti in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 5 (11/2017)
[article]
Titre : Transient swell of a high density polyethylene using adjustable gap slit die Type de document : texte imprimé Auteurs : V. K. Konaganti, Auteur ; E. Behzadfar, Auteur ; R. Kwak, Auteur ; E. Mitsoulis, Auteur ; Savvas G. Hatzikiriakos, Auteur Année de publication : 2017 Article en page(s) : p. 574-581 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cisaillement (mécanique)
Gonflement (physique)
Matières plastiques -- Moulage par soufflage
Polyéthylène haute densité
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : A novel slit die with an adjustable gap is designed to perform transient swell measurements while changing the die gap dynamically. A generalized control model is developed to predict time-dependent swell using characteristic relaxation time and corresponding steady state swell as model parameters. Further, a series of slit dies are designed and used to measure steady state thickness swell of a high-molecular-weight blow-molding grade high density polyethylene resin under various operating and geometrical conditions. A generalized expression for steady state thickness swell is obtained by applying multi-variable nonlinear regression on thus obtained steady state thickness swell data, and is used in the empirical control model to predict transient extrudate swell. Note de contenu : - EXPERIMENTAL : Oscillatory shear measurements - Extrudate swell measurements
- RESULTS AND DISCUSSION : Rheological characterization - Steady-state extrudate swell measurement - Validation using adjustable die gap swell measurementsDOI : 10.3139/217.3430 En ligne : https://drive.google.com/file/d/1g1MQ3F_W1jjiOmWf4TjTBsURKLJZY1VX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29424
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 5 (11/2017) . - p. 574-581[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19371 - Périodique Bibliothèque principale Documentaires Disponible Under high dynamic load / Eduard Kraus in ADHESION - ADHESIVES + SEALANTS, Vol. 13, N° 2/2016 (2016)
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Titre : Under high dynamic load Type de document : texte imprimé Auteurs : Eduard Kraus, Auteur ; Ulrich Hack, Auteur ; Benjamin Baudrit, Auteur ; Peter Heidemeyer, Auteur ; Martin Bastian, Auteur ; Thomas Wolheim, Auteur ; Roland Caps, Auteur ; Werner Wiegmann, Auteur ; Marc Fricke, Auteur Année de publication : 2016 Article en page(s) : p. 34-39 Langues : Multilingue (mul) Catégories : Assemblages collés
Cisaillement (mécanique)
Colles:Adhésifs
Energie de surface
Essais de résilience
Essais dynamiques
Isolation thermique
Panneaux préfabriqués
Stratifiés
TrousIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : Vacuum insulation panels - short VIP - are predestined for mobile use in applications with confined space. Can their long term insulating quality be guaranteed over the lifetime period of e.g. refrigerated trucks? To answer this question, a development team examined the technical solutions for the protection of vacuum insulation panels by adhesive bonding among other. The protective effects of various techniques were compared in puncture tests. Note de contenu : - Sensitive outer cover
- Material used
- Testing methods
- Experimental
- Surface energy or foils
- Tensile shear strength of overlap bondings
- Mechanical protection of VIP panelsEn ligne : https://drive.google.com/file/d/1qWyiPZIGT8pI-Gp3Hb4Uv41LS5iNYUDa/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26512
in ADHESION - ADHESIVES + SEALANTS > Vol. 13, N° 2/2016 (2016) . - p. 34-39[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18146 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Under the microscope : Examining how tackifier resins impact HMPSA performance Type de document : texte imprimé Auteurs : James A. Schlademan, Auteur Année de publication : 1999 Article en page(s) : p. 35-39 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs sensibles à la pression
Adhésifs thermofusibles
Adhésion
Cisaillement (mécanique)
Composés aliphatiques
Composés aromatiques
Copolymères séquencés
Essais accélérés (technologie)
ViscositéIndex. décimale : 668.3 Adhésifs et produits semblables Résumé : An analysis of some of the shear adhesion data was attempted in an earlier study but could not completed due to some problems with the static shear test and its inability to measure high-sehar values. At that time, however, a strong correlation was noted between some of the log of the shear values obtained and the log of Mn.
The main problem with the static shear test is that adhesives based on S-I-S block copolymers have such high room temperature shear values, that only highly plasticized formulations can be evaluated in a convenient period of time.
Work by Adriane Moser at Virginia Tech under the direction of Prof. John Dillard has made some progress towards the development of a dynamic test that would still correlate with the static test. Unfortunately, this work is not yet complete and only the 15 percent oil compositions, A and C, could be evaluated here.
Shear adhesion values were evaluated in the same manner as the viscosity results. A Correlation between log shear and log Mn,was still noted but, it was no longer particularly strong. Also, no significant correlation was observed between log shear and any of the variables relating to compatibility or aromatic content. A good model for the characterisation of shear adhesion will have to await further development.En ligne : https://drive.google.com/file/d/1YpBf0ij3Wg8WHhTIRFbXfYVatpHPDgif/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20045
in ADHESIVES AGE > Vol. 42, N° 10 (10/1999) . - p. 35-39[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001448 - Périodique Bibliothèque principale Documentaires Disponible Unlimited shear as a source of information in polymer melt processing / Hermann Janeschitz-Kriegl in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 3 (07/2014)
[article]
Titre : Unlimited shear as a source of information in polymer melt processing Type de document : texte imprimé Auteurs : Hermann Janeschitz-Kriegl, Auteur ; E. Ratajski, Auteur ; G. Eder, Auteur Année de publication : 2014 Article en page(s) : p. 402-411 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cisaillement (mécanique)
Cristallisation
Etat fondu (matériaux)
Polypropylène
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : It is shown that at unprecedented (high) temperatures an extremely slow long lasting shear treatment, which requires almost an hour for its unwinding, can produce a highly oriented structure in the melt of a crystallizing polypropylene. It seems that a convection process, which is characteristic for shear flow, furthers intimate contacts between parts of passing by macromolecular coils. In this respect an inspection of the broad spectrum of crystallization speeds of quiescent melts of a variety of polymers is instructive. The conception, which is defended in the present paper, is that thread-like nuclei are the result of the straightening of assemblages of already loosely connected macromolecules. At the high temperature applied the melt must immediately be quenched after the cessation of the flow in order to preserve the obtained thread-like nuclei. Apparently, only the number of successful encounters is relevant and not the frequency of their occurrence. For a lower frequency more time is required. It is evident that even mild touches can cause permanent adhesions, if the mutual local conformations just fit. One is reminded of the click of a slot. A new apparatus for unlimited shearing is described. This apparatus uses polymer samples, which are ring-shaped, being cut from molded plates of reasonable thickness. These rings possess an unusually large radius of 18 cm, in order to keep the curvature of the flow lines low. Rectilinear unlimited shearing is approached in this way. DOI : 10.3139/217.2859 En ligne : https://drive.google.com/file/d/1FR2U0wHV4XOI3TcKCwUiGrl5XeTVFrkc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21738
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 3 (07/2014) . - p. 402-411[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16404 - Périodique Bibliothèque principale Documentaires Disponible Urethane-modified VAE emulsion improves heat resistance / Wayne R. Furlan in ADHESIVES AGE, Vol. 37, N° 1 (02/1994)
PermalinkVieillissement, rajeunissement et thixotropie dans les fluides complexes Evolution de la viscosité au repos et sous cisaillements constants / Daniel Quemada in RHEOLOGIE, Vol. 6 (10/2004)
PermalinkViscosité d'un fluide / DEPEGEC (I.U.T. - Le Montet; Villers les Nancy cedex) / Villers les Nancy cedex : DEPEGEC (n.d.)
PermalinkPermalinkWetting behavior of the shear thinning power law fluids / Sima Didari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
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