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KUNSTSTOFFE INTERNATIONAL . Vol. 109, N° 1-2Mention de date : 01-02/2019Paru le : 18/02/2019 |
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Ajouter le résultat dans votre panierPremium surfaces by the one-shot process / Markus Koppe in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 1-2 (01-02/2019)
[article]
Titre : Premium surfaces by the one-shot process : Combination of technologies for manufacturing electronically functionalized plastic parts Type de document : texte imprimé Auteurs : Markus Koppe, Auteur Année de publication : 2019 Article en page(s) : p. 10-13 Langues : Anglais (eng) Catégories : Chauffage -- Appareils et matériels
Lasers -- Applications industrielles
Matières plastiques -- Moulage par injection
Matières plastiques dans les automobiles
Matières plastiques dans les équipements électriques et électroniques
Polyuréthanes
Surfaces (technologie)
Surfaces fonctionnelles
TexturationProcédé de frisure, conférant des boucles au hasard, ou modifiant d'une autre manière un fil de filament continu afin d'augmenter son pouvoir couvrant, sa résilience, sa résistance à l'abrasion, sa chaleur, son pouvoir d'isolation thermique, son pouvoir d'absorption d'humidité, ou pour lui donner une texture de surface différente. Les procédés de texturation peuvent être regroupés en six catégories.Index. décimale : 668.4 Plastiques, vinyles Résumé : In a joint project, seven companies developed a combination of technologies for manufacturing electronically functionalized high-quality surfaces, e.g., for applications in and on the car. Demo parts were shown in public for the first time at Fakuma 2018. Note de contenu : - Examples of free-formable circuit carriers
- Free-form control panels
- Precise forming of electronic foils
- Film back-injection and PU flooding in large series
- Casting lacquers with self-healing feature
- Fully digital laser texturing
- Fig. 1 : Examples of heating solutions integrated into the part
- Fig. 2 : Reversing-plate concept : first a functional film or a sandwich structure comprising a decorative and functional film is back-injected with thermoplastic, then, in a second process step, flooded with polyurethane (Clearmelt)
- Fig. 3 : System diagram : Schöfer offers the entire process competence from mold making, to the production cell with injection molding machine and integrated PU feeding
- Fig. 4 : Demo part manufactured by the Clearmelt process : high-gloss finely textured element on a surfaceEn ligne : https://drive.google.com/file/d/1308zMlShgS7XSTNRO3sTAr_27sVY6ch-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31808
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Titre : Modular thinking : Development of a production plant for hybrid fiber composite components Type de document : texte imprimé Auteurs : Sascha Kilian, Auteur ; Tobias Joppich, Auteur Année de publication : 2019 Article en page(s) : p. 14-17 Langues : Anglais (eng) Catégories : Automatisation
Composites à fibres
Construction modulaire
Matériaux -- Allègement
Matières plastiques -- Moulage par injectionIndex. décimale : 668.4 Plastiques, vinyles Résumé : "The right material in the right place" is the maxim of the multimaterial design. A lack of economical production methods has so far prevented commercialization at current batch sizes. To overcome this obstacle, a modular control and production plant concept was developed and demonstrated in the MoPaHyb collaborative project. Note de contenu : - Elements of a modular plant architecture
- Adaptability of the production line
- Demonstration on the reference plant
- Figure : MoPaHyb automation cell of the reference plant with feeding module for metallic inserts, heating module, robot, gripper system and hydraulic downstroke process
- Fig. 1 : Seat backrest demonstrator for process route 1 with molded-on reinforceing ribs and metallic inserts
- Fig. 2 : Schematic diagram of process route 1. Automated transfer operations (AT) or manual transfer operations (MT) show when the operator must intervene or when the process is carried out automatically
- Fig. 3 : Modular LFT injection molding module coupled with a hydraulic downstroke press for thermoforming and back-injection of laminated semi-finished productsEn ligne : https://drive.google.com/file/d/1V5FeRnTYNOUtYQh-6thWafSTZcvrQMB0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31809
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Code-barres Cote Support Localisation Section Disponibilité 20616 - Périodique Bibliothèque principale Documentaires Disponible Hard shell, lightweight core / Philipp Angst in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 1-2 (01-02/2019)
[article]
Titre : Hard shell, lightweight core : Rapid and cost effective sandwich parts with PU resin and PET core foam Type de document : texte imprimé Auteurs : Philipp Angst, Auteur ; Mike Wienand, Auteur Année de publication : 2019 Article en page(s) : p. 18-19 Langues : Anglais (eng) Catégories : Composites à fibres de carbone
Construction sandwich
Moulage par transfert de résine sous vide
Mousses plastiques
Polyéthylène téréphtalate
PolyuréthanesIndex. décimale : 668.4 Plastiques, vinyles Résumé : The combination of fiber-reinforced face layers with a lightweight foam core combines high strength and stiffness with low part weight. However, when processing, it is anything but easy to combine anisotropic FRP materials with lightweight,cost-effective foams. A tailored material system now makes processing by high-pressure resin transfer molding possible at low temperatures and pressures, with short cycle times. Note de contenu : - Good connection between the facing and core layers
- Evaluating the process window
- Figure : Good surface quality, pristine foam core : a cross-section through and HP-RTM part with carbon-fiber reinforcement of Airex T10.110 core and Henkel Loctite Max 2 PU resin
- Fig. 1 : Compressive strength of the foam cores Airex T10.110 and Airex TX.170 dependent on th emold temperature in the HP-RTM process
- Fig. 2 : Schematic curing behavior (DEA measurement) of Loctite Max 2 at 70°C mold temperature. The characteristically low viscosity at the start of the reaction is represented as a dotted line. Due to the freely selectable concentration of accelerator, a very curing of below 3 min can be achieved even at very low mold temperatures in the range from 60 to 70°CEn ligne : https://drive.google.com/file/d/1NdkmRVIq7AgLG-nt9WPWNhTbbXTNwpFJ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31810
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Code-barres Cote Support Localisation Section Disponibilité 20616 - Périodique Bibliothèque principale Documentaires Disponible Better part properties thanks to fewer fiber breakage / Thomas Köpplmayr in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 1-2 (01-02/2019)
[article]
Titre : Better part properties thanks to fewer fiber breakage : Plastification system optimized for processing long glass fiber materials Type de document : texte imprimé Auteurs : Thomas Köpplmayr, Auteur ; Georg Steinbichler, Auteur Année de publication : 2019 Article en page(s) : p. 20-22 Langues : Anglais (eng) Catégories : Composites à fibres de verre
Composites à fibres longues
Matières plastiques -- Moulage par injection
Matières plastiques dans les automobiles
Plastification
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
PolypropylèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : Long glass-fiber-reinforced polypropylene and polyamide are used in automotive lightweight construction especially where high impact toughness, very good crash behavior and low weight are required. However, care must be taken during injection molding, since not every screw is suitable for these materials. To maintain the fiber length reliably and obtain a uniform distribution of the fibers, Engel has developed a new plastification system especially for processing long glass-fiber-reinforced materials. Note de contenu : - A screw for different materials
- Comparison of the different screw concepts
- Loading of the fibers in the melt
- Figure : The greater channel depth in the feed zone prevents feeding problems with the rod-shaped pellets
- Fig. 1 : With the standard screw without LGF mixing head, the average fiber length is greatest, however with a low back pressure of 10 bar, fiber bundles are clearly visible. With the new LFS and 10 bar back pressure, the measured fiber lengths are somewhat higher than with the standard screw and 100 bar. Note: the distribution curve is a distribution of different fiber lengths and not a spot measurement
- Fig. 2 : High flowability (low viscosity) results in lower fiber length reduction (less friction). The standard screw with LGF mixing head and the new LFS yield comparable fiber lengths. All trials were performed at 10 bar holding pressure
- Fig. 3 : The plastification performances are greatest with the newly developed LFS. For the same cycle time, it offers the advantage of a lower rotational speed and therefore also less fiber size reduction. The trials were performed with screws with a diameter of 90 mm in each caseEn ligne : https://drive.google.com/file/d/1yRcDDgZWP6io1n856yicnT9GbimaFirm/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31811
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Titre : Energy-efficient melting : Retrofittable plasticizing units can halve heating energy consumption Type de document : texte imprimé Auteurs : Axel Ifland, Auteur Année de publication : 2019 Article en page(s) : p. 23-26 Langues : Anglais (eng) Catégories : Economies d'énergie
Efficacité énergétique
Enthalpie
Matières plastiques -- Moulage par injection
Plastification
Polymères
Presses à injecterIndex. décimale : 668.4 Plastiques, vinyles Résumé : A new generation of energy-efficient plasticizing units for injection molding machines that can be retrofitted to any make of machine, provides heating-energy savings of up to 55%. This development by start-up inmex enables older machines to be further optimized. The savings stem from an innovative heating system which integrates the heating elements into the barrel. Note de contenu : - Alarming waste-heat losses
- Fast heating, very good heat distribution
- Solution for rapid cooling and energy efficiency analysis
- Program for promoting investment
- Figure : Frontal view of an inmex plasticizing unit. Not visible from the outside : the heating elements integrated into the barrel
- Fig. 1 : Heat output with insulation as a function of throughput, based on th emeasuremen tresults of 30 different applications
- Fig. 2 : Plasticizing unit and plsticizing screw can be retrofitted to any make of machine
- Fig. 3 : Energy-efficient inmex plasticizing unit for an Arburg injection molding machine
- Fig. 4 : Energy dissipated via the feed zone cooling system
- Fig. 5 : Enthalpy of different polymers as a function of throughputEn ligne : https://drive.google.com/file/d/14omIQtrUs6xMfL9vZSEhV0G9Tk_LTClm/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31817
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Titre : Tailor-made for planar components : HRSflow presented demanding hot runner solutions at the Fakuma 2018 Type de document : texte imprimé Année de publication : 2019 Article en page(s) : p. 27-28 Langues : Anglais (eng) Catégories : Canaux chauffants
Matières plastiques -- Moulage par injection
Presses à injecter -- Systèmes de fermetureIndex. décimale : 668.4 Plastiques, vinyles Résumé : The Italian hot-runner manufacturer introduced needle valve closures for a variety of series parts to the trade fair visitors. The scope of the exhibits ranged from thin-walled suitcase shells and collapsible two-material bath boxes to laptop covers with a top-class surface. Note de contenu : - Large, thin-walled, and deformation-resistant suitcase shell
- Collapsible box in 2C-Technology
- Superior appearance of a laptop cover
- Fig. 1 : The collapsible box has its own construction principle : the flexible TPE components connect the wall elements of PP
- Fig. 2 : The needle valve hot runner technology in combination with the alternating temperature control developed by Roctool enables a high surface qualityEn ligne : https://drive.google.com/file/d/1iHZmsy8cAZ9OFdtwM2A5lNo_CiaJ3sjp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31818
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Code-barres Cote Support Localisation Section Disponibilité 20616 - Périodique Bibliothèque principale Documentaires Disponible Multifunctional trade-fair give-away / Michael Thielen in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 1-2 (01-02/2019)
[article]
Titre : Multifunctional trade-fair give-away : Four companies team up for the joint "check card" project Type de document : texte imprimé Auteurs : Michael Thielen, Auteur Année de publication : 2019 Article en page(s) : p. 29-30 Langues : Anglais (eng) Catégories : Carte de contrôle
Matières plastiques -- Moulage par injection
Moules d'injectionIndex. décimale : 668.4 Plastiques, vinyles Résumé : Four project partners showcased their companies at Fakuma last October by means of an ingenious give-away. Two of the companies involved - Horst Keller Werkzeugbau and Hasco - have already enjoyed a dependable working relationship for almost 50 years. They implemented the project, based on an idea by injection molding machine manufacturer, Dr. Boy, in a very short time, together with a third partner from their network. Note de contenu : - Mold design in the fast lane
- Multifunction card with different surface patterns
- Project duration until the sampling : five weeks
- Fig. 1 : The "check card" is a plastic article incorporating a number of different functions
- Fig. 2 : With the NX Reuse Library, nu-merous Hasco standard components can be called up as CAD models and incorporated in the design at the click of a mouse
- Fig. 3 : The injection mold for the check card was ready for use within five weeksEn ligne : https://drive.google.com/file/d/1EOV5asbRWAJtXpXONt5mIPYn7KcY2fGG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31819
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Code-barres Cote Support Localisation Section Disponibilité 20616 - Périodique Bibliothèque principale Documentaires Disponible Bioplastics with halogen-free flame retardants / Robert Breuer in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 1-2 (01-02/2019)
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Titre : Bioplastics with halogen-free flame retardants : Foamed boards and foamed injection molded parts made from cellulose acetate with a halogen-free flame retardant system and environmentally friendly blowing agents Type de document : texte imprimé Auteurs : Robert Breuer, Auteur ; Yuxiao Zhang, Auteur ; Christian Hopmann, Auteur Année de publication : 2019 Article en page(s) : p. 31-36 Langues : Anglais (eng) Catégories : Acétate de cellulose L'acétate de cellulose est une matière plastique inventée en 1865. C'est l'ester acétate de la cellulose.
Agents de gonflement
Bioplastiques
Essais (technologie)
Essais de comportement au feu
Ignifugeants -- Suppression ou remplacement
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Isolation thermique
Mousses plastiques
Mousses plastiques -- Extrusion
Mousses plastiques -- Moulage par injection
Polymères expansés
PolystyrèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : Foamed polystyrene boards (XPS) have been used for generations in thermal insulation applications, e.g. for buildings. Due to its comparable mechanical and thermal properties, bio-based cellulose acetate (CA) represents a promising, sustainable alternative which is also an interesting material for technical components due to its heat resistance. However, producing such parts by foam extrusion or foam injection molding with halogen-free flame retardant systems and environmentally friendly blowing agents is a challenge. Note de contenu : - Materials used
- Equipmentfor foam extrusion trials
- Equipment for foam injection molding trials
- Foam extrusion of CA compounds with flame retardant system
- Foam injection molding trials
- Resulting density of the extruded foam boards
- Fire behavior of the extruded foam boards
- Injection pressures and foam structures of the injection-molded test specimens
- Fire behavior of the injection molded test specimens
- Figure : Samples of foamed cellulose acetate with halogen-free flame retardant system after the flammability test
- Fig. 1 : Material composition of the tested CA compounds and the polystyrene reference
- Fig. 2 : The foam board extrusion line used within the project of the IKV
- Fig. 3 : ProFoam system for introducing the blowing agent into the cellulose acetate
- Fig. 4 : Foam board densities of the CA compounds investigated in foam extrusion
- Fig. 5 : Exemplary foam samples after the flammability test : if the measuring mark is not reached, the test is passed. The sample on the right did not pass the test
- Fig. 6 : Measured process pressures in foam injection molding
- Fig. 7 : Foam structure of th einjection-molded components : the microscopic images show different homogeneity in cell size and cell distribution depending on the blowing agent and compound formulationEn ligne : https://drive.google.com/file/d/1gCSZicOJ1-1a-WJW4Udxs5dc4oVSXLor/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31820
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Code-barres Cote Support Localisation Section Disponibilité 20616 - Périodique Bibliothèque principale Documentaires Disponible Systems like a symphony / Karlhorst klotz in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 1-2 (01-02/2019)
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Titre : Systems like a symphony : Direct recycling of PET flakes into food-grade film Type de document : texte imprimé Auteurs : Karlhorst klotz, Auteur Année de publication : 2019 Article en page(s) : p. 37-39 Langues : Anglais (eng) Catégories : Emballages en matières plastiques
Films plastiques
Matières plastiques -- Recyclage
Polyéthylène téréphtalateIndex. décimale : 668.4 Plastiques, vinyles Résumé : Even though economical use of material is a perennial theme, the needs of plastics processors change with the requirements of the times. Recycling of post-consumer packaging is a great challenge at present. An Italian manufacturer has developed a two-stage system that can produce films suitable for food contact without intermediate pelletizing. We took a look around the company headquarters. Note de contenu : - Viewing the innovative systems in operation
- From bottle flake to rigid food-grade film in one system
- Cost effective alternative: recyclate layer encapsulated in a sandwich
- View of the roots
- Figure : Changing requirements: besides the achiev-able bubble diameter, flexibility is increasing-ly playing a growing role, allowing different materials to be combined thanks to multilayer technology
- Fig. 1 : Material flow : Andrea Carraro explains the processing of bottle flake into food-compatible PET in the purification line
- Fig. 2 : Bottle flakes : depending on how high the requirements on the end product are, different grades of PET recyclate can be used separately or in combination
- Fig. 3 : Key components : the dies that are crucial for the extrusion process quality are produced by Bandera in-houseEn ligne : https://drive.google.com/file/d/1U16rVwAloDSVkdp2cOLReDup8jyK2Qyc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31824
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Code-barres Cote Support Localisation Section Disponibilité 20616 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : 3D-printed minimalists : Improved extrusion head designs thanks to additive manufacturing Type de document : texte imprimé Auteurs : Heinz Gross, Auteur ; Sebastian Gross, Auteur ; J. M. Nóbrega ; Joao P. O. Vidal Année de publication : 2019 Article en page(s) : p. 40-43 Langues : Anglais (eng) Catégories : Fusion sélective par laser La fusion sélective par laser (selective laser melting en anglais) est une technique de fabrication additive capable de produire des pièces métalliques à l'aide de lasers de haute puissance, faisant fusionner progressivement et localement, c'est-à -dire de façon sélective, une poudre métallique dans une atmosphère contrôlée.
Impression tridimensionnelle
Malaxeurs et mélangeurs
Matières plastiques -- Extrusion
Simulation par ordinateur
Têtes d'extrusionIndex. décimale : 668.4 Plastiques, vinyles Résumé : The development of additive manufacturing processes, such as selective laser melting (SLM), has significantly extended the options for manufacturing extrusion heads. Extrusion head designs can now be realized with very slender geometries, which not only have integrated mixer functions, thereby improving the melt homogeneity, but can also be used to attach the mandrel to the head. This allows compact heads to be manufactured with a very high potential for saving operating costs. Note de contenu : - An innovative head design avoids weld marks and reduces the number of invidual parts
- Design challenges
- Head for a small-diameter tube
- Blow molding for a parison
- Head for thin tubes
- Figure : Size comparison: the mixer spider-type head mounted on the extruder, which is manufactured by an additive process, without the heating tapes, weighs 480 g ; the conventional head lying below it in the catch basin weighs 32 kg
- Fig. 1 : A spider-type head manufactured conventionally, with radial adjusting screws for centering the die
- Fig. 2 : Section through the innovative pipe head in perspective view
- Fig. 3 : Air channel that follows the profile of the wall of the honeycomb system
- Fig. 4 : Tube head with tilt die and axial setting screws during the testing at Siro-Plast GmbH
- Fig. 5 : Mixer-spider-type head with counterrotating
spiral mixer spider legs : 3D view and mounted on the trial extruder
- Fig. 6 : Simulation results of a color exchange trial after 5 s ; figures top left : with supporting air channel ; figures bottom left : channel section rotated through 90 degrees without the disruption of the melt stream by the supporting air channel. Blue : original color; red: color purged out of the channel with the blue melt
- Fig. 7 : Color exchange trials : the improved mixer spider-leg system results in uniform colors over the entire cross-section of the samples, which were removed at different times during color exchange trials
- Fig. 8 : Cutaway view of a one-piece mixer-spider-type head with an innovative Integrated supporting air-channel system and a sensitively adjustable tilt dieEn ligne : https://drive.google.com/file/d/1CtB4_4kYnN_-sTEmwiaIHeKZ_aZVpB5s/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31825
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Code-barres Cote Support Localisation Section Disponibilité 20616 - Périodique Bibliothèque principale Documentaires Disponible Freshly configured, better joined / Frank Brunnecker in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 1-2 (01-02/2019)
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Titre : Freshly configured, better joined : Next generation optics promises 30 percent cycle time savings and higher yield Type de document : texte imprimé Auteurs : Frank Brunnecker, Auteur Année de publication : 2019 Article en page(s) : p. 47-49 Langues : Anglais (eng) Catégories : Essais (technologie)
Polybutylène téréphtalate
Soudage laser
Soudures
Temps de cycle (production) -- RéductionIndex. décimale : 668.4 Plastiques, vinyles Résumé : High savings in welding time while maintaining or improving the quality of the welded joint - this was the driving force behind the development of a new optical setup at Evosys Laser GmbH. In the meantime, experience with a well-known German automotive supplier of two real components with increased safety requirements, for which extensive documentation had to be provided, has been gained. Note de contenu : - Near-series tests on real assemblies
- Shorter cycle times with the same strength and more stable process
- Higher strengths with the same welding time
- Figure : A look into the production shows several radial welding machines shortly before delivery. The NGO technology is now abailable for all Evosys systems
- Fig. 1 : Damaged PBT assembly: since the transmission of the material is relatively low, there is a risk of superficial burns if sufficient laser power is used for laser welding
- Fig. 2 : Standard optics and NGO in comparison: welding time was significantly reduced for both components. The mean values of the measurements on five units are shown in each case
- Fig. 3 : Burst pressure comparison: the differences lie in the order of magnitude of the measuring tolerances
- Fig. 4 : Unchanged seam quality despite shorter welding time : standard optics compared to NGO. In the center of the image of the fractography of assembly I the fractured seam appears in the focus of the microscope. The images on the left show the view of the transparent joining partner, the images on the right the view of the absorbing joining partner
- Fig. 5 : Burst pressure comparison : mean values from five type I assemblies with the same welding timeEn ligne : https://drive.google.com/file/d/1XrhIxueCWtxRfXggyhOHHO23Ex2XQm6-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31827
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Titre : Plastic forms metal : One-step hybrid foaming process for the production of hybrid structures for vehicle bodies and chassis Type de document : texte imprimé Auteurs : Xiangfan Fang, Auteur ; Daniel Heidrich, Auteur ; Tobias Kloska, Auteur ; Björn Sonnenstädt, Auteur ; Norbert Stötzner, Auteur ; Andreas Sprick, Auteur ; Rüdiger Heinritz, Auteur ; Maximilian Gruhn, Auteur Année de publication : 2019 Article en page(s) : p. 50-53 Langues : Anglais (eng) Catégories : Assemblages multimatériaux
Automobiles -- Pièces
Essais dynamiques
Flexion trois points
Matières plastiques -- Moulage par compression
Matières plastiques dans les automobiles
Polyamide 6Index. décimale : 668.4 Plastiques, vinyles Résumé : In large-scale automotive production, all-metal components are still mainly used instead of high-performance plastic/metal hybrids for reasons of cost. With a newly developed production process combining metal sheet forming and compression molding, hybrid components can now be manufactured more quickly and economically. Note de contenu : - Efficient production of hybrid components
- Tool technology and sealing concept
- Design of hybrid components
- Production of the longitudinal and transverse control arms
- Figure : The longitudinal control arm or a rear suspension system made from a hybrid comprising long fiber-reinforced PA6 and steel sheet is formed an dbonded in one step. The two materials combine lightweight design with fail-safe crash behavior
- Fig. 1 : The subsequent process oprations shown schematically in a sectio nthrough a hybrid compression mold
- Fig. 2 : To prevent escape of thermoplastic melt in hybrid compression molding, various sealing concepts were developed for the mold. Sealing profiles with open ends, such as for side or cross members, posed a particular challenge
- Fig. 3 : Comparison and results of different component variants based on cross-member geometry in the three-point bending test. Weighing 10 % less than conventional steel strike plate structures (black), the steel/LFT (orange) structure can withstand twice the load
- Fig. 4 : Thanks to the component-optimized design of the suspension link, a thinner metal sheet could be used in combination with the plastic, so achieving an overall weight saving of around 20% compared with the steel reference component
- Fig. 5 : View of the D-LFT machine that precedes hybrid forming and view into the hybrid mold at Weber Fibertech. One-step production of the steel/LFT longitudinal control arm follows in a hydraulic upper ram press
- Fig. 6 : The finished hybrid control arm components before (transverse control arm) and after (longitudinal control arm) the trimming operationEn ligne : https://drive.google.com/file/d/1nIlWXQvIbcnKwQwf02yIe0azsh6MYAXA/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31831
in KUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 1-2 (01-02/2019) . - p. 50-53[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20616 - Périodique Bibliothèque principale Documentaires Disponible Continuing production despite PA66 shortage / Tony Harrison in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 1-2 (01-02/2019)
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Titre : Continuing production despite PA66 shortage : Tips and alternatives in view of short material supply Type de document : texte imprimé Auteurs : Tony Harrison, Auteur Année de publication : 2019 Article en page(s) : p. 54-56 Langues : Anglais (eng) Catégories : Polyamide 6
Polyamide 66
Polymères -- Suppression ou remplacement
PolyoléfinesUne polyoléfine, parfois appelée polyalcène, désigne un polymère aliphatique saturé, synthétique, issu de la polymérisation d'une oléfine (aussi appelée un alcène) telle l'éthylène et ses dérivés.
La formule générale est -(CH2-CRR')n-, où R et R' peuvent être l'atome d'hydrogène (H) ou les radicaux alkyle apolaires CH3, CH2-CH3, CH2-CH(CH3)2. Il existe aussi des mousses isolantes souples faites à partir de polyoléfine (pour l'isolation thermique de tuyaux plastiques par exemple).
PRESENTATION : Les polyoléfines forment la plus importante famille de matières plastiques, avec quatre représentants (PP, HDPE, LDPE, LLDPE) parmi les plastiques de grande consommation. La consommation mondiale de ces quatre polymères est évaluée à plus de 60 millions de tonnes en 20001.
Seul un petit nombre de polyoléfines a atteint le niveau industriel :
les polyoléfines thermoplastiques semi-cristallines : polyéthylène (PE), polypropylène (PP), polyméthylpentène (PMP), polybutène-1 (PB-1) ;
les polyoléfines élastomères : polyisobutylène (PIB), éthylène-propylène (EPR ou EPM) et éthylène-propylène-diène monomère (EPDM).
PROPRIETES : En raison de leur nature paraffinique, les polyoléfines sont hydrophobes et possèdent en général une grande inertie chimique (aux solvants, acides, bases, etc.). Ces matériaux ont donc une qualité alimentaire. Le collage est très difficile (la surface est particulièrement inerte, des traitements de surface spéciaux sont nécessaires).
Cependant, ils sont sensibles à l'action des UV, et résistent très peu à l'inflammation car leur indice limite d'oxygène est faible (exemple : ILO ~ 17 pour le polyéthylène).
Leur densité est très faible [0,83 (cas du PMP) < d < 0,95] : ils flottent dans l'eau.
Ils sont opaques, sauf le PMP (transparent).
Produits et matériaux recyclésIndex. décimale : 668.4 Plastiques, vinyles Résumé : Material producers are declaring one force majeure after another, compounders are encountering supply shortages, and now even the last warehouse is scraping the bottom of the barrel. Polyamide 66 is in short supply and many processors, especially of engineering components, are finding themselves in a predicament. It is time to look around for alternatives. Note de contenu : - Recycled materials and polyolefines
- If in doubt, use high-performance plastics
- Table 1 : Differences between the material and processing properties of polyamide 6 and polyamide 66 (with appropriate heat aging stabilization)
- Table 2 : Possible replacement polymer for PA66, depending on requirements. Depending on the polymer and reinforcement combination, properties can differ from those of PA66. Particular attention must be paid to moisture absorption, shrinkage, and thermal stability
En ligne : https://drive.google.com/file/d/1u0cb6znc8XxCLy7iXkEV0-56geMYz9jn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31832
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