Accueil
Catégories
> Polypropylène
PolypropylèneVoir aussi
|
Ajouter le résultat dans votre panier Affiner la recherche
Etendre la recherche sur niveau(x) vers le bas
Réintroduire le polypropylène en boucle fermée / Sophie Rabeau in PLASTIQUES & CAOUTCHOUCS MAGAZINE, N° 919 (03/2015)
[article]
Titre : Réintroduire le polypropylène en boucle fermée Type de document : texte imprimé Auteurs : Sophie Rabeau, Auteur ; Laurent Cauret, Auteur ; Thierry Falher, Auteur ; Denis Jouannet, Auteur ; Marc-Antoine Jevardat de Fombelle, Auteur ; Toni Gallone, Auteur ; Gérard Liraut, Auteur Année de publication : 2015 Article en page(s) : p. 60-63 Note générale : Bibliogr. Langues : Français (fre) Catégories : Composites thermoplastiques -- Recyclage
Matières plastiques -- Recyclage
Matières plastiques dans les automobiles
PolypropylèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : Recyclage des véhicules - La législation française sur les véhicules hors d'usage (VHU) va obliger les industriels à élever les taux de valorisation et de recyclage. Le projet Icarre 95 permet d'étudier des solutions pour répondre à ces objectifs. Note de contenu : - Caractérisation et échantillonnage
- Modèles théoriques
- Une méthode globale élaboréePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23318
in PLASTIQUES & CAOUTCHOUCS MAGAZINE > N° 919 (03/2015) . - p. 60-63[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 17004 - Périodique Bibliothèque principale Documentaires Disponible Replication of stochastic and geometric micro structures – Aspects of visual appearance / G. R. Berger in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 3 (07/2011)
[article]
Titre : Replication of stochastic and geometric micro structures – Aspects of visual appearance Type de document : texte imprimé Auteurs : G. R. Berger, Auteur ; Dieter P. Gruber, Auteur ; Walter Friesenbichler, Auteur ; C. Teichert, Auteur ; M. Burgsteiner, Auteur Année de publication : 2011 Article en page(s) : p. 313-322 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection
Polycarbonates
Polymères cristallins
PolypropylèneTags : 'Moulage injection' Polypropylène hautement cristallin 'Polycarbonate 'Miscrostructures stochastiques' 'Microstructures géométriques' 'Aspect visuel' 'Réplication microstructures' Index. décimale : 668.4 Plastiques, vinyles Résumé : The surface quality of injection molded parts depends on the processing conditions, the cavity surface structure, the runner system, the used polymer and the part geometry. Different replication of the cavity surface structure to the molded part influences its surface function and visual appearance. A descriptive model of the replication process has been developed, taking into account the thickness of the frozen layer during injection. The expected dependencies were proven by systematic injection molding tests with geometric surface micro structures, having depths of 45 or 100 μm and widths from 400 to 2 000 μm, that were replicated into highcrystalline polypropylene (HCPP) and polycarbonate (PC). The volumetric structure replication ratio increased with rising mold temperature, melt temperature and cavity pressure. As expected, the mold temperature was dominant for very small micro features. The RMS roughness, determined by confocal microscopy and atomic-force microscopy, was found to be a suitable replication parameter for draw-polished to mirrorfinished stochastic cavity surface structures. An abrupt change in wall thickness decelerated the flow front velocity, thus decreased the replicated polymer surface roughness and increased the surface gloss. Moreover, a several micrometer high “surface step” remained, due to the different thicknessdependent shrinkage. This step always ascended from the thicker to the thinner part area. The replication of a mirrorfinished mold surface into HCPP was dominated by morphological effects. Local micro shrinkage differences led to micro sink marks, which affected the surface gloss much more than the mold surface structure. DOI : 10.3139/217.2451 En ligne : https://drive.google.com/file/d/1-0SMNhW1w25G6Z5ldo0iFFVthFdqYNeh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12420
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 3 (07/2011) . - p. 313-322[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 013159 - Périodique Bibliothèque principale Documentaires Disponible Residence time distribution in a high shear twin screw extruder / E. Fel in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 1 (03/2014)
[article]
Titre : Residence time distribution in a high shear twin screw extruder Type de document : texte imprimé Auteurs : E. Fel, Auteur ; Valérie Massardier, Auteur ; F. Melis, Auteur ; Bruno Vergnes, Auteur Année de publication : 2014 Article en page(s) : p. 71-80 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cisaillement (mécanique)
Distribution de temps de séjour
Extrudeuse bi-vis
Polypropylène
Simulation par ordinateurIndex. décimale : 668.4 Plastiques, vinyles Résumé : The residence time distributions (RTD) of a high shear twin screw extruder were measured by an on–line UV fluorescence device. First, by increasing throughput (Q) and screw speed (N), a decrease of the complex viscosity of the studied polypropylene (PP) was observed, revealing chain scissions. It was associated to high viscous dissipation taking place during extrusion, and more particularly under high shear conditions. Then the impact of these experimental conditions on the RTD was carried out. As expected, an increase of usual throughputs and screw speeds decrease mostly the RTD characteristic data. In this study industrial rate have been studied: throughput varied from 1.5 up to 22 kg h?1 and screw speed varied from 200 min?1 up to 1 200 min?1. However, by increasing the screw speed over usual values (from 500 up to 1 200 min?1), the variation of some experimental RTD characteristics were unexpected. Indeed, the slope of the shape of the experimental RTD function E(t) changed significantly. This phenomenon will be called lag or delay time. This result was only observed at low throughputs and high screw rotation speeds. To finish, a modeling software of twin screw extrusion process was used to compare experimental and calculated results. For usual processing conditions (up to 700 min?1), the simulation predicts nicely the experimental RTDs. However, at high screw speed (N > 800 min?1) and moderate throughput (Q = 4 kg h?1), the simulation fails to predict the RDT delay time. Hence, some side effects apparently occurred during high shear extrusion at low throughputs. Note de contenu : - THEORETICAL ASPECTS : Residence time distribution (RTD)
- MATERIALS AND METHODS : Material - Twin screw extruder - UV tracer and UV-fluorescence device - Bulk temperature
- RESULTS AND DISCUSSION : Experimental results - Simulation from Ludovic softwareDOI : 10.3139/217.2805 En ligne : https://drive.google.com/file/d/1o_Iuqwuk5vId94nbqcSHDVbikBJ84ssh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20577
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 1 (03/2014) . - p. 71-80[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16006 - Périodique Bibliothèque principale Documentaires Disponible Resource efficient lightweight design for mass production / Alexander Roch in KUNSTSTOFFE INTERNATIONAL, Vol. 101, N° 9 (09/2011)
[article]
Titre : Resource efficient lightweight design for mass production Type de document : texte imprimé Auteurs : Alexander Roch, Auteur ; Timo Huber, Auteur ; Manfred Reif, Auteur ; Benjamin Hangs, Auteur Année de publication : 2011 Article en page(s) : p. 14-17 Langues : Anglais (eng) Catégories : Analyse mécanique dynamique
Composites à fibres de verre -- Moulage par injection
Composites à fibres longues
Matériaux -- Imprégnation
Polypropylène
Thermoplastiques -- Moulage par injectionIndex. décimale : 668.4 Plastiques, vinyles Résumé : Multi-Material Design - While demands placed on lightweight constructions are growing, it is frequently not sufficient to merely replace materials. Holistic approaches and the targeted combination of different materials with their specific benefits are the key to efficient lightweight design.
Note de contenu : - Local continuous fiber reinforcement - Tailored injection molding
- Thermoplastic tape laying using an instrument panel cross-member as an example
- Battery protective casing in a multi-material designPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15018
in KUNSTSTOFFE INTERNATIONAL > Vol. 101, N° 9 (09/2011) . - p. 14-17[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 13328 - Périodique Bibliothèque principale Documentaires Disponible
[article]
Titre : Reverse rotation : Manufacturing and installing multi-component parts on a two-part cube mold Type de document : texte imprimé Auteurs : Martin Ortgies, Auteur Année de publication : 2019 Article en page(s) : p. 20-24 Langues : Anglais (eng) Catégories : Automatisation
Canaux chauffants
Matières plastiques -- Moulage par injection multicomposant
Matières plastiques -- Rotomoulage
Polyoxyméthylène
Polypropylène
Productivité
Surveillance électronique
Temps de cycle (production) -- RéductionIndex. décimale : 668.4 Plastiques, vinyles Résumé : The new Reverse Cube developed by Foboha manufactures various components or multi-component parts from varying materials in one step and assembles individual parts into finished products independently from the cycle time using an integrated handling robot. The automated process improves quality, accelerates cycle times by up to 40 % compared to separate injection molding and assembly processes, and thus enables substantial productivity gains at lower costs. Note de contenu : - A new process for multi-component parts
- A valve hot runner system for narrow process windows
- Higher production volume and lower unit costs
- Bespoke injection molding and robot technology
- Automated monitoring and control of the manufacturing process
- Monitoring the condition of injection molds
- Figure : Two thermally separated cube molds rotate in opposite directions at a 90°C angle. Injection and cooling of component 1 (roller made of PP) and component 2 (female connection made of POM) staggered by 180°C
- Fig. 1 : A reverse cube allows both plastic parts - a roller and female connection - to be manufacturated and assembled in a single work operation
- Fig. 2 : The 6-axis robot removes the rollers from the lower cube half at the same time as the injection cycle (shown in a dry run here) and inserts them into the female connections in the top cube half cavities
- Fig. 3 : The injection-molded components are ready for removal after each semi-rotation of the two thermally separted cube molds
- Fig. 4 : The software and hardware for the allrounder Cube 2900 injection molding machine and the quality assurance evaluation system were adapted to match the new mold technologyEn ligne : https://drive.google.com/file/d/1zO7f9DueaBGbqCuuuNBtCg0myExfHHGh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33652
in KUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 11 (11/2019) . - p. 20-24[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21285 - Périodique Bibliothèque principale Documentaires Disponible Rheo-chemistry in reactive processing of polyolefin / W. Yu in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)
PermalinkA rheological investigation of the crystallization kinetics of syndiotactic polypropylene of varying degree of tacticity / R. Pasquino in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 3 (07/2018)
PermalinkRheological properties of neat and calcium carbonate particles filled polypropylene blends under axial vibration force field / Y. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 1 (03/2011)
PermalinkRhéologie des polymères solides. Application à la simulation numérique de la déformation plastique / B. Monasse in LES CAHIERS DE RHEOLOGIE, Vol. XIV, N° 1 (09/1995)
PermalinkPermalinkRhéologie des suspensions. Rhéologie à toutes les échelles / Groupe Français de Rhéologie / Groupe Français de Rhéologie (2002)
PermalinkRheology of polypropylene/liquid crystalline polymer blends : effect of compatibilizer and silica / Reza Foudazi in APPLIED RHEOLOGY, Vol. 20, N° 1 (2010)
PermalinkA rounded approach to sustainability / Tom Hogarth in INTERNATIONAL LEATHER MAKER (ILM), N° 50 (11-12/2021)
PermalinkScaling-up a reactive extrusion operation : A one-dimensional simulation analysis / Ederley Ortiz-Rodriguez in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 3 (07/2010)
PermalinkPermalinkSelf-cleaning screen changers in practical application / Erica Canaia in KUNSTSTOFFE INTERNATIONAL, Vol. 104, N° 4 (04/2014)
PermalinkSelf-reinforced thermoplastic composites / Hans-Peter Heim in KUNSTSTOFFE INTERNATIONAL, Vol. 104, N° 2 (02/2014)
PermalinkSensibilité à la vitesse des composites particulaires à base de polypropylène / Nadia Bahlouli in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 25, N° 2 (04-05-06/2015)
PermalinkSimha-Somcynsky equation of state modeling of the PVT behavior of PP/clay-nanocomposite/CO2 mixtures / M. M. Hasan in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 4 (08/2014)
PermalinkSimplifier des pièces exigeantes / Patrick Debard in PLASTIQUES & CAOUTCHOUCS MAGAZINE, N° 899 (12/2012)
Permalink