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2.5D or 3D ? / Stefan Roth in KUNSTSTOFFE PLAST EUROPE, Vol. 94, N° 7/2004 (07/2004)
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Titre : 2.5D or 3D ? Type de document : texte imprimé Auteurs : Stefan Roth, Auteur ; Hendrik Sura ; Bernd Küster, Auteur Année de publication : 2004 Article en page(s) : p. 65-67 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.4 Plastiques, vinyles Résumé : Practical comparison of simulation techniques - More and more 3D programs for simulating the injection moulding process have become available in recent years. Especially as regards compact geometries, the three-dimensional part meshing demonstrated here promises to deliver more accurate simulation results than conventional 2.5D simulation methods, which reduce part geometry to a shell model for the purposes of simulation. The following article uses the example of a pump component to compare the advantages and disadvantages of both simulation techniques with regard to the reproducibility of the filling pattern and their practical implementation in everyday use. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7834
in KUNSTSTOFFE PLAST EUROPE > Vol. 94, N° 7/2004 (07/2004) . - p. 65-67[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000146 - Périodique Bibliothèque principale Documentaires Disponible Making converters fit for the manufacture of medical devices / Stefan Roth in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 3 (2022)
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Titre : Making converters fit for the manufacture of medical devices : VDI ProValiMed guideline project launched Type de document : texte imprimé Auteurs : Stefan Roth, Auteur ; Thomas Seul, Auteur Année de publication : 2022 Article en page(s) : p. 22-24 Langues : Anglais (eng) Catégories : Bonnes pratiques de fabrication
Dispositifs médicaux
Matériel médical
Polymères en médecine
Procédés de fabricationIndex. décimale : 668.4 Plastiques, vinyles Résumé : In particular, for component manufacturers, also called converters, the validation of processes under the new Medical Device Regulation is a challenge - whereas the product manufacturers of medical devices already have ways of approach worked out for that. The ProValiMed 2023 initiative sets guardrails with the help of a new VDI guideline. The aim is to use the guideline to create a generally agreed consensus in the sense of “good practice”. As a guideline for action, it defines framework conditions for processes of manufacturing plastic components for medical devices. Note de contenu : - AiF project "ValiData" delivers first solutions for injection molding
- Fig. 1 : Validation as an integral part of the medical device development process
- Fig. 2 : Thematic fields of the VDI guideline 2023 "ProValiMed"En ligne : https://drive.google.com/file/d/16wDO903HFqsoS0w3-VpaLuIMC_pVjWwP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37705
in KUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 3 (2022) . - p. 22-24[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23353 - Périodique Bibliothèque principale Documentaires Disponible Solving the mystery of kinking / Kremser, Thomas in KUNSTSTOFFE INTERNATIONAL, Vol. 107, N° 9 (09/2017)
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Titre : Solving the mystery of kinking : Test methods for characterizing the flexural behavior of plastic hoses Type de document : texte imprimé Auteurs : Kremser, Thomas, Auteur ; Gläss, Liesa, Auteur ; Stefan Roth, Auteur ; Schubert, Dirk W., Auteur Année de publication : 2017 Article en page(s) : p. 66-69 Langues : Anglais (eng) Catégories : Essais de résilience
Essais dynamiques
Flexion (mécanique)
Matériel médical
Matières plastiques -- Propriétés mécaniques
Maxwell, Modèle deLe modèle de Maxwell décrit un matériau viscoélastique, c'est-à-dire ayant à la fois des propriétés élastiques et visqueuses. Ce modèle fut proposé par James Clerk Maxwell1 en 1867.
Relaxation des contraintes
TubesIndex. décimale : 668.4 Plastiques, vinyles Résumé : The flexibility of infusion lines is a key product feature for their application. However, adverse pressure may cause kinking that can interfere with treatment safety. New test methods characterize the kinking behavior of hoses, and are able to predict the behavior over several days within hours. Note de contenu : - Kinking radius of infusion lines
- Characterizing the resilience of the hoses
- Mechanical stress relaxation and Maxwell modeling
- Correlation between stress relaxation and kinking behavior
- FIGURES : 1. The kinking radius is determined using a U-shaped piece of hose that is brought together at a constant speed in a holder - 2. The kinking radii of the material types at 23°C and 40°C show that PVC-P hoses exhibit a smaller and therefore better kinking radius than TPEs - 3. Principle for determining the resilience capacity. A kink occurs due to the local collapse of the wall caused by pressure or bending the hose - 4. Typical curve progression for the recovery of the hose using PVC-P as an example with a linling time of 2 day at 23°C - 5. Comparison of the extrapolation to 30 days for the recovery capacity from a forced kink at 23°C and 40°C - 6. Principle of mechanical stress relaxation test using the TSSR method - 7. Schematic approach for developing a regression model
- TABLE : Parameters for the correlation of the Maxwell modelEn ligne : https://drive.google.com/file/d/1qHgLh7r3_6Ywzn3ltnbItoIObrX_Pn8r/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29131
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Code-barres Cote Support Localisation Section Disponibilité 19135 - Périodique Bibliothèque principale Documentaires Disponible The VDI guideline "medical grade plastics" / Thomas Seul in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 4 (04/2018)
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Titre : The VDI guideline "medical grade plastics" : Clarity and mandatory procedures for plastics in medical products Type de document : texte imprimé Auteurs : Thomas Seul, Auteur ; Stefan Roth, Auteur Année de publication : 2018 Article en page(s) : p. 37-39 Langues : Anglais (eng) Catégories : Certification
Formulation (Génie chimique)
Gestion de l'approvisionnement
Matériel médical
Matières plastiques -- Normalisation
Polymères en médecine
Relations clients-fournisseursIndex. décimale : 668.4 Plastiques, vinyles Résumé : Selecting the right material is already a challenging procedure for developers, and is even more difficult for medical products: in addition, critical quality attributes are needed that make it necessary to perform, for example, a biological assessment. Note de contenu : - What ISO10993 means
- Who bears the responsibility for medical products?
- Origin and development of the VDI guideline
- The lowest common denominator for medical grade plastics
- Summary : a guideline as a code of practice
- FIGURES : 1. Formulation consistency is an important requirement for constant properties - 2. Supply security : measures intended to ensure security of supply - 3. Change management responds to changes in the constancy forumlation (composition, components), manufacturing process, security of supply and in the event of conformity declarations). By passing on information to the customer, the supplier ensures that the information flow takes place from manfuacturer to distributor - 4. Content of the necessary quality agreement : In the customer-supplier relationship, the quality agreement plays a central role and is fixed between the two partnersEn ligne : https://drive.google.com/file/d/1sGzbn-YiQWMPKE_J6IfDc1vIGmhk3PyB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30490
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 4 (04/2018) . - p. 37-39[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19801 - Périodique Bibliothèque principale Documentaires Disponible