Analysis of residual stresses in blow molded polyethylene terephthalate bottles using creep model / W.-F. Hao in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 5 (11/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 5 (11/2015) . - p. 534-541 Titre : Analysis of residual stresses in blow molded polyethylene terephthalate bottles using creep model Type de document : texte imprimé Auteurs : W.-F. Hao, Auteur ; X.-W. Chen, Auteur ; Y.-N. Yuan, Auteur ; Y.-J. Ma, Auteur Année de publication : 2015 Article en page(s) : p. 534-541 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse numérique Bouteilles en matières plastiques Contraintes (mécanique) Contraintes résiduelles Eléments finis, Méthode des Fluage Matières plastiques -- Moulage par soufflage Polyéthylène téréphtalate Index. décimale : 668.4 Plastiques, vinyles Résumé : In this paper, the residual stress in polyethylene terephthalate (PET) bottles, which was processed using blow-molding, was analyzed theoretically and numerically. First, the process of blow-molding was analyzed theoretically, which had considered both blowing process and curing of the polymer. The creep model was used to describe the relation between the deformation and the pressure in the blowing process, and thermo-chemical model was used to describe the curing process of the PET bottle. Then, a simulation was carried out using ABAQUS based on the creep model and thermo-chemical curing model. The deformation, residual stresses, heat flux vector and strain of the PET bottle during the blow-molding process were obtained. Finally, the effect of loading path on the residual stress was analyzed numerically, which shows that the longer the pressure was applied, the larger the residual stress. Note de contenu : - THEORETICAL ANALYSES : Blow molting process -PET curing process - FEM MODEL : Thermal modeling - Process conditions - RESULTS AND DISCUSSION : Deformation - Residual stress distribution - Temperature history - Strain distribution DOI : 10.3139/217.3036 En ligne : https://drive.google.com/file/d/1s0CTpHzfA8HwN2d1aFADtKHGk6rBjbhm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24814 [article]

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Bi-axially oriented blown film technology / Olga. S. Carneiro in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 3 (07/2012) . - p. 348-357 Titre : Bi-axially oriented blown film technology : searching for suitable polymers and processing conditions Type de document : texte imprimé Auteurs : Olga. S. Carneiro, Auteur ; Jose A. Covas, Auteur ; C. Domingues, Auteur Année de publication : 2012 Article en page(s) : p. 348-357 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Films plastiques Matières plastiques -- Extrusion Matières plastiques -- Moulage par soufflage Polyéthylène basse densité Polyéthylène basse densité linéaire Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : A set of commercial polyethylenes (three LDPE and three LLDPE) was rheological characterized and processed in a laboratory double bubble extrusion line with the purpose of investigating: i) whether their relative processability could be predicted in the laboratory and ii) the effect of operating and machine variables on processability. Oscillatory shear and extensional measurements were able to differentiate the various materials, who also behaved quite differently upon processing. Those with a stronger shear thinning behaviour, higher elasticity and higher melt strength were the most suited to the process. Bubble stability and thickness uniformity were assumed as the main requirements for processability. The former was estimated by monitoring the time required to stabilize the bubble and examining any variation/oscillation in size/shape. Bubble stability depends on the interaction between various parameters, the most relevant being those related with the film cooling stage, namely the axial position of the air rings, the air flow rate and air velocity. The study was preceded by an assessment of the performance of the re-heating oven and die/calibration/centring, as these parameters could also narrow the practical operating window. DOI : 10.3139/217.2538 En ligne : https://drive.google.com/file/d/1vmDHZ82pkVX1zGGfuPziStB4r2smFuX0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15581 [article]

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Bottle from wood / Veronika Schadek in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 7 (07/2013)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 103, N° 7 (07/2013) . - p. 48-49 Titre : Bottle from wood Type de document : texte imprimé Auteurs : Veronika Schadek, Auteur Année de publication : 2013 Article en page(s) : p. 48-49 Langues : Anglais (eng) Catégories : Bois Bouteilles en matières plastiques Composites à fibres végétales Matières plastiques -- Moulage par soufflage Polyéthylène Index. décimale : 668.4 Plastiques, vinyles Résumé : Packaging - A manufacturer of blow molded articles from Thuringia, Germany, has succeeded in mass producing bottles from a natural fiber compound. These bottles, which look as though they have been turned from wood and smell like wood, offer a promising alternative to conventional packaging and new application opportunities. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19167 [article]

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Complex 3D parts / Elena Dilba in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 8 (08/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 8 (08/2019) . - p. 44-46 Titre : Complex 3D parts : Plastic pipes and tubes from the multifunctional blow molding machine Type de document : texte imprimé Auteurs : Elena Dilba, Auteur ; Catrin Jansen-Steffe, Auteur Année de publication : 2019 Article en page(s) : p. 44-46 Langues : Anglais (eng) Catégories : Matières plastiques -- Appareils et matériel Matières plastiques -- Moulage par soufflage Matières plastiques -- Soufflage Index. décimale : 668.4 Plastiques, vinyles Résumé : As customers become more choosy and the times more uncertain, flexibility is trumps in production. In blow molding, such freedom is created by a 3D suction blow molding machine which can also be used for conventional (2D) blow molding. An ideal place to develop such a machine is an organization that is also experienced in training plastics technologists, especially when, thanks to contract research, it keeps a finger on the pulse of the times. Note de contenu : - A variety of deployment scenarios - Focus on 3D parts production - Summary : Win-win situation - Figure : The ASPI 200 is deployed in the technical center of the Dr. Reinold Hagen Foundation En ligne : https://drive.google.com/file/d/1gaBXlteS_p3O34GAfPiBONXIxglqaUQ_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33308 [article]

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Determining the optimum heating concept for BMC / Vanessa Frekers in KUNSTSTOFFE INTERNATIONAL, Vol. 107, N° 12 (12/2017)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 107, N° 12 (12/2017) . - p. 30-33 Titre : Determining the optimum heating concept for BMC : Simple answers to complex questions in mold design Type de document : texte imprimé Auteurs : Vanessa Frekers, Auteur ; Diogo Alves de Sa, Auteur Année de publication : 2017 Article en page(s) : p. 30-33 Langues : Anglais (eng) Catégories : Chauffage -- Appareils et matériels Matières plastiques -- Moulage par soufflage Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : To be able to cost efficiently design complex molds, e.g. for BMC components, it is essential to take into account the mold cooling. Thus, the mold costs increase in a linear relationship with the number of heating cartridges provided. It is therefore desirable to aim for as few cartridges as possible, but at the same time, this can have a disavantageous effect on the homogeneity of the temperature distribution and the robustness of the process. Until now, these conflicting goals were largely resolved based on experience. But it can also be done systematically. Note de contenu : - Specifying the degrees of freedom and boundary conditions - Reaching the goal with a structured procedure - Step1 : optimum number and position of the heating cartridges - Step2 : Position of the control points - Step3 : Robust process and necessary heating output - FIGURES : 1. Fixed and moving half of a two-cavity mold for headlamp reflectors of BMC - 2. The possible positions for heating cartridges in brown and green for uniform distribution in the mold - in the first step their influence on the evaluation area is determined - 3. The influence ofheating cartridges on the evaluation area falls with increasing distance from the cavity center (positions of the first calculation in green, and the second calculation in orange) - 4. Four heating cartridges are the ideal number within the cavity ; more cartridges do not result in a further temperature increase - 5. With a virtual DoE, all possible positions for heating cartridges are determined with and outside the cavity - 6. Temperature reached in the jacket area around the cavity, depending on the number and spacing of the heating cartridges - 7. With the aid of a thermal simulation of the mold, the possible positions for the three control points are determined - 8. Four heating cartridges each in three control circuits with the associated control points (TC01, TC02 and TC03) - this what the final layout looks like En ligne : https://drive.google.com/file/d/1_A25Yw-yjFKPeSgAyb428DkmsXkJFSmP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29678 [article]

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Effect of blend ratio of h-LLDPE and LDPE on tear properties of blown films / K. Mezghani in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)  

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Efficiency is in fashion / Anna Funk in KUNSTSTOFFE INTERNATIONAL, Vol. 100, N° 12 (12/2010)

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Efficient suction blow molding / Markus Holbach in KUNSTSTOFFE INTERNATIONAL, Vol. 107, N° 3 (03/2017)  

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Feeding blow molding production / Thomas Schwachulla in KUNSTSTOFFE INTERNATIONAL, Vol. 105, N° 4 (04/2015)  

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Flexible blow molded parts of silicone rubber / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 3 (03/2018)  

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From glass-blowing to blow molding / Michael Thielen in KUNSTSTOFFE INTERNATIONAL, Vol. 101, N° 5 (05/2011)  

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High-pressure preform foam blow molding / L. H. Mark in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 5 (11/2017)  

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Identification de paramètres de comportement de membranes en polymères durant le procédé de soufflage in MATERIAUX & TECHNIQUES, Vol. 94, N° 5 (2006)  

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Quality control included / Sarah Schäfer in KUNSTSTOFFE INTERNATIONAL, Vol. 106, N° 12 (12/2016)  

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Simulation-based approach for probing rheology-processing-structure relationships in foam blow molding / A. Kumar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 5 (11/2019)  

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Stretch-blow molding of PET copolymers - influence of molecular architecture / E. Déloye in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)  

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System options for wafer-thin protection / Thorsten Leopold in KUNSTSTOFFE INTERNATIONAL, Vol. 102, N° 7 (07/2012)

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Tilting technique improves centering and other features / Heinz Gross in KUNSTSTOFFE INTERNATIONAL, Vol. 102, N° 3 (03/2012)

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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)  

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