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The effect of extensional viscosity on the core structure of fiber orientation for injection-molded fiber composites / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 4 (2023)
[article]
Titre : The effect of extensional viscosity on the core structure of fiber orientation for injection-molded fiber composites Type de document : texte imprimé Auteurs : Huan-Chang Tseng, Auteur Année de publication : 2023 Article en page(s) : p. 456-471 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de verre
Composites à fibres de verre -- Moulage par injection
Composites à fibres longues
Fibres longues
Fluides newtoniens
IsotropieL'isotropie caractérise l’invariance des propriétés physiques d’un milieu en fonction de la direction. Le contraire de l’isotropie est l’anisotropie.
Polypropylène
Prévision, Théorie de la
Simulation par ordinateurIndex. décimale : 668.4 Plastiques, vinyles Résumé : The famous informed isotropic (IISO) viscosity successfully dominates the broader core structure of fiber orientation distributions for injection-molded long fiber composites, due to the flow-fiber coupling effect of stretching deformation. Recently, the GNF-X (Generalized Newtonian Fluid eXtended) constitutive equation of weighted shear/extensional viscosity has been shown to possess the potential to demonstrate the extension-induced corner vortex in the entry flow of a polymer melt. Using GNF-X, three-dimensional injection-molding flow simulations of a center-gated disk are, therefore, performed for verifying the effect of extensional viscosity on the core structure of fiber orientation, namely, the extension-induced fiber orientation. The equivalent of GNF-X and IISO is demonstrated for predicting fiber orientation distribution, while their primary parameter relationship is particularly found herein. It is significant to visualize dramatic patterns of extensional rate occurring in the center-gated disk simulation. Note de contenu : - THEORETICAL BACKGROUND : GNF shear viscosity - GNF-X weighted viscosity - IISO flow-fiber coupling - iARD-RPR orientation equation
- RESULTS AND DISCUSSION : Extension-induced fiber orientation of core region - The equivalent of GNF-X and IISO - Parameter relationship between GNF-X and IISO
- Table 1 : Viscosiy model parameters for 30 % SGF/PP at 200 °C
- Table 2 : Stretching ratio at different flow types and orientation states
- Table 3 : Viscosiy model parameters for the 40 % LGF/PP compositeDOI : https://doi.org/10.1515/ipp-2023-4368 En ligne : https://drive.google.com/file/d/1vo8JECdjbnVVnlopacxPYfksoEpbhrMz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40108
in INTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 4 (2023) . - p. 456-471[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24319 - Périodique Bibliothèque principale Documentaires Disponible The effect of feeding method and compatibilizer on nanoclay partitioning and microfibrillar morphology development in PP/PBT/organoclay blend nanocomposite fibers / A. Bigdeli in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)
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Titre : The effect of feeding method and compatibilizer on nanoclay partitioning and microfibrillar morphology development in PP/PBT/organoclay blend nanocomposite fibers Type de document : texte imprimé Auteurs : A. Bigdeli ; Hussein Nazockdast Année de publication : 2013 Article en page(s) : p. 174-179 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Argile
Extrusion filage
Fibres
Fibrillation
Nanoparticules
Polybutylène téréphtalate
PolypropylèneIndex. décimale : 668.9 Polymères Résumé : The role of feeding method, as an important parameter in competition with thermodynamic parameters, on determining the nanoclay partitioning and its impact on microfibril formation in PP/PBT blend nanocomposite fibers were investigated. In the direct feeding method in which all components were fed into the extruder simultaneously, the major part of nanoclay with almost unchanged interlayer d-spacing was located in the PP matrix and the rest of the nanoclay partitioned into the PBT dispersed phase. However in the PBT based masterbatch method nanoclay, due to much greater melt intercalation occurred, remained in PBT droplets in the form of tactoids and/or platelets. In the masterbatch feeding method, incorporation of compatibilizer assisted more fraction tactiods and/or platelets to be transferred from PBT to the PP matrix while in the direct method it enhanced the extent of melt intercalation in the PP matrix. It was demonstrated that the nanoclay concentration in PBT droplets plays an important role in the extent of the microfibril formation during the melt spinning process. While at low organoclay loading (1 wt%) fine microfibrils could be formed in the fibers prepared by both methods of feeding, at higher organoclay loading (3,5 wt%) uniform microfibrils could hardly be developed in the fibers, particularly, in the masterbatch feeding method due to high melt elasticity of the PBT droplets and uneven distribution of platelets and/or tactoids in the droplets.
DOI : 10.3139/217.2669 En ligne : https://drive.google.com/file/d/105SKV12MRMcB16iJEgLF1jBbUGylWXMQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18427
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Code-barres Cote Support Localisation Section Disponibilité 15050 - Périodique Bibliothèque principale Documentaires Disponible The effect of ultraviolet ageing on the flame retardancy, thermal stability and mechanical properties of LGFPP/IFR / W.-D. He in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 2 (05/2019)
[article]
Titre : The effect of ultraviolet ageing on the flame retardancy, thermal stability and mechanical properties of LGFPP/IFR Type de document : texte imprimé Auteurs : W.-D. He, Auteur ; Y. Zhou, Auteur ; Y.-F. Wu, Auteur ; J.-B. Guo, Auteur ; X.-L. Chen, Auteur ; X. Zhang, Auteur Année de publication : 2019 Article en page(s) : p. 262-269 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de verre
Composites à fibres de verre -- Effets du rayonnement ultraviolet
Composites à fibres de verre -- Propriétés mécaniques
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Intumescence (chimie)
Matières plastiques -- Détérioration
Polypropylène
Stabilité thermiqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : In this work, long glass fibre reinforced polypropylene/intumescent flame retardants (LGFPP/IFR) composites are exposed to ultraviolet (UV) radiation with wavelength of 340 nm for 0–800 h. The effects of UV ageing on the flame retardancy, thermal stability and mechanical properties of LGFPP/IFR composites are investigated and discussed by limiting oxygen index (LOI), UL–94 test, cone calorimeter test (CCT), thermogravimetric analysis (TGA), scanning electronic microscopy (SEM), mechanical properties and energy dispersive X-ray analysis (EDAX). A slight variation in LOI values and UL-94 levels are observed, and CCT results display a lower heat release rate for all aged samples. The TGA result also shows that aged samples have a higher degradation temperature with the prolongation of the aging time. EDAX showed higher content of the O, P and N elements on the surface of samples after 600 h ageing, which means partly gathering of IFR particles. The tensile, bending and impact strengths decrease after ageing, and the fracture morphology shows that interface debonding occurs. Note de contenu : - EXPERIMENTAL : Materials - Preparation of samples - Measurements characterization
- RESULTS AND DISCUSSION : UL-94 and LOI - Dynamic combustion - Thermal stability - EDAX results - Mechanical properties and fracture morphologyDOI : 10.3139/217.3707 En ligne : https://drive.google.com/file/d/1rlrNh-brKe-1J_BJc7BhLFdHeM-0Qt5n/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32401
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Code-barres Cote Support Localisation Section Disponibilité 20883 - Périodique Bibliothèque principale Documentaires Disponible The effects of processing parameters on the residual wall thickness distribution at the sharp angle corner of water assisted injection molded parts / T. Pudpong in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
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Titre : The effects of processing parameters on the residual wall thickness distribution at the sharp angle corner of water assisted injection molded parts Type de document : texte imprimé Auteurs : T. Pudpong, Auteur ; P. Buahom, Auteur ; I. Satoh, Auteur ; T. Saito, Auteur Année de publication : 2013 Article en page(s) : p. 528-540 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Epaisseur -- Mesure
Matières plastiques -- Moulage par injection
Matières plastiques -- Moulage par injection assistée par eau
Polypropylène
Simulation par ordinateur
TubesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Water-assisted injection molding (WAIM) has been widely used for tubular plastic parts due to its advantages of relatively low cost and fast cycling time. However, the non-uniform distribution of the wall thickness, especially at the sharp corner, is still a basic problem in the WAIM process. This work presents the effects of sharp corner angles on wall thickness distribution in sections near corners for various processing conditions of the WAIM process, including melt temperature, mold temperature, water delay time, water holding time, and holding pressure. Three grades of polypropylene (PP) resins with different melt flow indices were studied using seven mold geometries that varied the angle of the sharp corner section. The wall thickness distribution at the corner sections were characterized in terms of inner and outer residual wall thicknesses, hollow core ratio, and the percentage of difference between the inner and outer wall thicknesses. In addition, computational fluid dynamic simulations with Moldflow Plastics Insight version 4.1 were performed for each sharp corner angle. It was found that the wall thickness distribution of the straight tube was more uniform than those of the curve tubes. Water injection delay time and water pressure were the major parameters that had a significant impact on the hollowed core ratios, while the percent difference between inner and outer wall thicknesses was mainly influenced by melt temperature. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Injection molding machine and mold - Process parameters - Characterization - Simulation
- RESULTS AND DISCUSSION : Relationship between shear rate and inner residual wall thickness - Effect of MFI on residual wall thickness distribution - Effect of melt temperatures on residual wall thickness distribution - Effect of mold temperature on residual wall thickness distribution - The effect of water delay time on residual wall thickness distribution - The effect of water pressure on residual wall thickness distribution - The effect of water holding time on residual wall thickness distribution - Stifness - Inner surface roughness - Switchover mark - Microscopic observationDOI : 10.3139/217.2792 En ligne : https://drive.google.com/file/d/1fjKjyjWOGlo3-G8uXFzpKHhITn1nsyA2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19899
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Code-barres Cote Support Localisation Section Disponibilité 15682 - Périodique Bibliothèque principale Documentaires Disponible The effects of some engraving and film substrate parameters on the solid density and the dot gain in gravure printing / E. N. Gencoglu in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B1 (03/2005)
[article]
Titre : The effects of some engraving and film substrate parameters on the solid density and the dot gain in gravure printing Type de document : texte imprimé Auteurs : E. N. Gencoglu, Auteur Année de publication : 2005 Article en page(s) : p. 19-23 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact
Encre
Héliogravure
Masse volumique
Polyesters
Polypropylène
Rugosité
Structure biaxiale
Tension superficielleIndex. décimale : 667.9 Revêtements et enduits Résumé : The effects of some engraving and film substrate parameters on the solid density and dot gain in gravure printing were studied by using polyester, BOPP plain film and BOPP co-extruded film substrates. Bi-axially oriented polypropylene (BOPP) is a product utilised in numerous industries such as food packaging, printing, laminating and labeling. It was concluded that the solid density of print is affected by the roughness values of the film substrates. Increasing the roughness value increases the print density. The number of cells per cm2 and the depth of the cells also affect the solid density. Deeper and fewer cells per cm2 give a lower solid density value than shallower cells and more cells per cm2.
Engraving parameters have a major effect on the dot gain. The channel between cells has a positive effect on the dot gain. The cell depth and the number of cells per cm2 also affect the dot gain.
The highest dot gain value was measured from the 35% coverage area of all of the scales printed on all the substrates. Also, the highest dot gain values were measured for the prints on polyester the smoothest substrate.Note de contenu : - EXPERIMENTAL METHODS : Printing substrates - Surface tention and water contact angle - Surface roughness
- RESULTS AND DISCUSSION : Solid density - Effect of engraving parameters - Dot gain
- Table 1 : Engraving properties of printed scales
- Table 2 : Properties of printing substratesDOI : 10.1007/BF02699703 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699703.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5432
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Code-barres Cote Support Localisation Section Disponibilité 000389 - Périodique Bibliothèque principale Documentaires Disponible PermalinkThe future of polypropylene lies in the circular economy / Klaus Bernreitner in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 8 (2022)
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PermalinkThe influence of extrusion conditions on mechanical and thermal properties of virgin and recycled PP, HIPS, ABS and their ternary blends / Erik Stenvall in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 5 (11/2013)
PermalinkThe influence of mechanical recycling on properties in injection molding of fiber-reinforced polypropylene / Tim Evens in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 4 (08/2019)
PermalinkThe influence of melt and process parameters on the quality and occurrence of part defects in water-assisted injection molded tubes / Sofie Sannen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 5 (11/2011)
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PermalinkThe role of nanoclay partitioning and fibril formation on dyeability of blend nanocomposite fibres / Ahmad Bigdeli in COLORATION TECHNOLOGY, Vol. 129, N° 4 (08/2013)
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PermalinkThermal and flame-resistance behavior of polypropylene fabrics / Vivek Mane in CHEMICAL FIBERS INTERNATIONAL, Vol. 65, N° 3 (10/2015)
PermalinkThermal conductivity of polypropylene composites with combined boron nitride fillers / W. Cheewawuttipong in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 2 (05/2014)
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PermalinkThree-dimensional coating of containers / Susanna Stock in KUNSTSTOFFE INTERNATIONAL, Vol. 100, N° 7 (07/2010)
PermalinkThree-dimensional fiber skeleton / Björn Beck in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 9 (09/2019)
PermalinkTôles ondulées pour toitures et panneaux plats utilisant une nouvelle fibre de polypropylène / P. Houang in TEXTILES A USAGES TECHNIQUES (TUT), N° 61 (09-10-11/2006)
PermalinkTPE : la tendance est aux matériaux sur mesure / Gerhard Berger in CAOUTCHOUCS & PLASTIQUES, N° 793 (03/2001)
PermalinkTraitement du polypropylène par thermodiffusion avant collage / J. P. Becue in CAOUTCHOUCS & PLASTIQUES, N° 707 (08-09/1991)
PermalinkTriangle rule for operating windows and scale-up criteria for volume resistivity of PP/carbon nanotubes composites / W. Polrut in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 4 (09/2011)
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