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[article]
Titre : Stay cool, even when things get hot : Active cooling zone for foam extrusion Type de document : texte imprimé Auteurs : Kai Johann, Auteur ; Christian Bonten, Auteur ; Philipp Thieleke, Auteur ; Timo Räpple, Auteur ; Johannes Hahn, Auteur Année de publication : 2024 Article en page(s) : p. 38-41 Langues : Anglais (eng) Catégories : Matières plastiques -- Refroidissement
Mousses plastiques -- Extrusion
Polypropylène
Polystyrène
Systèmes de refroidissementIndex. décimale : 668.4 Plastiques, vinyles Résumé : Plastic foams are important for resource conservation and material efficiency by reducing the part density. In order to produce a foam with a low density and a uniform bubble structure, the plastic melt, loaded with the blowing agent, must be cooled before entering the mold. Therefore, the IKT at the University of Stuttgart in Germany and Helix GmbH are developing a new, active cooling zone for foam extrusion in a joint research project. Note de contenu : - "Static-dynamic" cooling
- Modular screw design
- Reduction of the melt temperature
- What affects foam density ?
- Fig. 1 : Schematic representation of the newly developed foam extrusion system
- Fig. 2 : Pressure loss occurring along the newly developed cooling zone for four different screw geometries, two different materials and two oil temperatures
- Fig. 3 : Melt temperature of PP after exiting the cooling zone as a function of oil temperature for four different screw geometries at 50 rpm
- Fig. 4 : Melt temperature of PS after exiting the cooling zone as a function of oil temperature for four different screw geometries at 50 rpm
- Fig. 5 : Light microscopy images of PS foamed with 0.1 wt. % N2 (top) and PP foamed with 0.2 wt.% N2 (bottom). The gas-filled voids are depicted in blackEn ligne : https://drive.google.com/file/d/1C1X7hFAzrjCkJ06neqjupS8Rw-OaY29I/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40805
in PLASTICS INSIGHTS > Vol. 114, N° 1 (2024) . - p. 38-41[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24500 - Périodique Bibliothèque principale Documentaires Disponible Surface quenching induced microstructure transformations in extrusion foaming of porous sheets / A. Gandhi in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Surface quenching induced microstructure transformations in extrusion foaming of porous sheets Type de document : texte imprimé Auteurs : A. Gandhi, Auteur ; Naresh Bhatnagar, Auteur Année de publication : 2015 Article en page(s) : p. 397-402 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Matières plastiques -- Refroidissement
Morphologie (matériaux)
Mousses plastiques -- Extrusion
Polymères -- Surfaces
Surfaces (technologie)Index. décimale : 668.4 Plastiques, vinyles Résumé : In this article, a new technology is described to manufacture open cell thermoplastic foamed sheets with the aid of surface-quenching phenomenon during an extrusion process. As the gas laden polymer extrudate exits the slit die, its surface is rapidly quenched which results in freezing of cells on the surface, while the cells at the core continue to grow and leads to development of open-cellular microstructure at the core. Influence of chill roll temperature was found to be extremely significant in developing porous morphological attributes. Subsequently, synergistic effect of physical blowing agent (N2) content and chill roll temperature was examined for their expansion ratio and foam thickness. Fascinatingly, with reduced chill roll temperatures open-cell microstructure and high expansion ratio was obtained although its thickness was observed to decrease. Further, influence of chill roll rotating speed on foam microstructure and expansion ratio was studied. Lower chill roll rotational speed resulted in development of open-cellular microstructure; while at higher speeds, closed cell morphology was obtained. The results coherently demonstrate that by controlling the chill roll temperatures ; open-cellular microstructure can be developed in sheet extrusion foaming process. Note de contenu : - EXPERIMENTAL : Materials - Foaming methodology - Foam characterization
- RESULTS AND DISCUSSIONS : Influence of surface quenching on foam morphology - Synergistic effect of blowing agent content and surface quenching on open cell microstructure development - Influence of chill roll rotational speed on open cell microstructure developmentDOI : 10.3139/217.3057 En ligne : https://drive.google.com/file/d/1ZdtFspE921BkZifuo1NnEHi5DBDGXFFX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24335
in INTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 3 (07/2015) . - p. 397-402[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Thermoforming and cooling / Peter Scharzmann in KUNSTSTOFFE INTERNATIONAL, Vol. 106, N° 4 (04/2016)
[article]
Titre : Thermoforming and cooling : Sheet machines with central cooling air supply achieve higher productivity Type de document : texte imprimé Auteurs : Peter Scharzmann, Auteur Année de publication : 2016 Article en page(s) : p. 40-42 Langues : Anglais (eng) Catégories : Matières plastiques -- Refroidissement
Matières plastiques -- Thermoformage
Systèmes de refroidissementIndex. décimale : 668.4 Plastiques, vinyles Résumé : On sheet forming machines that can process materials up to a good 10 mm thickness, cooling of the moldings after forming plays a major role. A controlled, central cooling air supply allows significant improvements in the course of the process, productivity and product quality to be achieved. Note de contenu : Central cooling air supply creates constant conditions
- Influence on cooling time and mold temperature
- Centrai air cooling and high table speed - an ideal combination
- Reduced molding deformation
- Better demoldability
- Reduced molding shrinkage, lower energy consumption
- Improved effectivenessEn ligne : https://drive.google.com/file/d/19ibGQmHAWmZFDevPgUvgPVmELcRObf9S/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25986
in KUNSTSTOFFE INTERNATIONAL > Vol. 106, N° 4 (04/2016) . - p. 40-42[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17921 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : A tight spot : Linde and Lüdenscheid Plastics Institue developed a technology to spot-cool injection molds Type de document : texte imprimé Auteurs : Andreas Praller, Auteur Année de publication : 2017 Article en page(s) : p. 23-25 Langues : Anglais (eng) Catégories : Dioxyde de carbone
Matières plastiques -- Moulage par injection
Matières plastiques -- Refroidissement
Systèmes de refroidissement
Température -- Contrôle
Temps de cycle (production) -- RéductionIndex. décimale : 668.4 Plastiques, vinyles Résumé : In injection molding, uniform temperature distribution across the surface of the mold wall has a significant impact on cycle times and product quality. However, production is often slowed by hot spots in areas that are difficult, or impossible, to reach with conventional water cooling. Spot cooling with liquid carbon dioxide can supplement water cooling to resolve these issues. As the following three case studies show, the results can be very impressive. Note de contenu : - Kunstsoff christel: one technology, seven cores
- Hörl Kunstsofftechnik: on track with spot cooling
- Adolf Föhl : working under pressure for the best solution
- FIGURES : 1. Supplementing water cooling with spot cooling can significantly increase the efficiency of injection molding - 2. The Plastinum Spot Cooling package includes control equipment, distributors and capillary tubes and can be used with new molds and also retroffited to existing injection molds - 3. Hörl specializes in the highly automated production of small and micro injection-molded parts. Thanks to the spot cooling solution from Linde, the company has increased the quality of its parts and reduced cycle timesEn ligne : https://drive.google.com/file/d/1sTW-LbiXdnCta4IV131IDd9cUgsqvE2k/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29535
in KUNSTSTOFFE INTERNATIONAL > Vol. 107, N° 11 (11/2017) . - p. 23-25[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19404 - Périodique Bibliothèque principale Documentaires Disponible Twice as fast with nitrogen cooling / Sultan Süzer Ilbay in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 8 (08/2013)
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Titre : Twice as fast with nitrogen cooling Type de document : texte imprimé Auteurs : Sultan Süzer Ilbay, Auteur ; Akin Kandemir, Auteur Année de publication : 2013 Article en page(s) : p. 67-69 Langues : Anglais (eng) Catégories : Azote
Démoulage
Matières plastiques -- Refroidissement
Moules d'injection
Systèmes de refroidissementIndex. décimale : 668.4 Plastiques, vinyles Résumé : Mold tempering - An efficient cooling needs to be provided to the mold in order to be able to demold parts with narrow domes rapidly and default free - meaning without hotspots - in narrow spaces. Nitrogen filled copper pins are suitable as an alternative to conventional water cooling. They do not only promise shorter cycle times. Note de contenu : - Core tempering with nitrogen cooled copper pins
- Implementation in manufacturing moldsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22945
in KUNSTSTOFFE INTERNATIONAL > Vol. 103, N° 8 (08/2013) . - p. 67-69[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15395 - Périodique Bibliothèque principale Documentaires Disponible