300 bar pressurized nitrogen under control / Reinhard Bauer in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 9 (09/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 9 (09/2018) . - p. 38-40 Titre : 300 bar pressurized nitrogen under control : Automotive supplier uses airmould gas injection technology Type de document : texte imprimé Auteurs : Reinhard Bauer, Auteur Année de publication : 2018 Article en page(s) : p. 38-40 Langues : Anglais (eng) Catégories : Automobiles -- Pièces Automobiles -- Poignées de portières Corps creux Matières plastiques -- Moulage par injection assisté par gaz Matières plastiques dans les automobiles Index. décimale : 668.4 Plastiques, vinyles Résumé : The production plant of the German Witte Automotive group, newly opened in Ostrov, Northern Bohemia, in 2016, specializes in the production of car door handles and locking modules in cooperation with the Nejdek plant 20 km away. Its current annual production amounts to approximately 3.5 million units. About one million of the handles produced are manufactured as hollow parts, using Wittmann Battenfeld Airmould gas injection technology. Note de contenu : - Mechanical sliders inside the injection mold - Central pressurized nitrogen network for all machines - System integration for easy operation - Fig. : The diversity of shapes, colors and functionalities of the external door handles and locking units manufactured at Witte Automotive in Ostrov, Czech Republic, which must also comply with stringent crash safety regulations, is impressive - Fig. 1 : Two handle models with the core material displaced by the nitrogen into the overflow cavity. The finished product, a ready-to-install handle with three layers of high-gloss painting, is shown in the middle - Fig. 2 : Four pressure control units separate the gas flow at the machine into four individual streams - Fig. 3 : Four pressure control units separate the gas flow at the machine into four individual - Fig. 4 : Close-up view of a 4-cavity mold to produce door handles with gas injection technology as a hollow body made of PA6-GF30 En ligne : https://drive.google.com/file/d/1zQa-QQtFo0D2CBg1OFQ7S_qUmta0A9IL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31173 [article]

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Complex hollow parts made in one go / Peter Schwarzmann in KUNSTSTOFFE INTERNATIONAL, Vol. 106, N° 10 (10/2016)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 106, N° 10 (10/2016) . - p. 150-154 Titre : Complex hollow parts made in one go : Twinsheet molding - a thermoforming specialty Type de document : texte imprimé Auteurs : Peter Schwarzmann, Auteur Année de publication : 2016 Article en page(s) : p. 150-154 Langues : Anglais (eng) Catégories : Corps creux Matières plastiques -- Soudage Matières plastiques -- Thermoformage Thermoformage double feuille Index. décimale : 668.4 Plastiques, vinyles Résumé : Practical know-how - The purpose of the twinsheet thermoforming process is to link two molded parts so that they form a hollow body. For this purpose, two semi-finished parts are formed individually and welded together right inside the thermoforming mold, prior to final cooling. Note de contenu : - General properties of twinsheet forming - Example from practical application : air ducts made of PE foam - FIGURES : 1. Twisheet molded parts (from left) : vehicle spoilers, planting bowls and air ducts are some examples - 2. Major twisheet thermoforming elements : Upper/lower mold (1,9), heating unit (2,8), clamping frames (3,7), semi-finished product (4,6), intermediate clamping frame (5), vacuum connectors top/bottom (10) as well as provision for air feed from the atmosphere (11) for vacuum forming ; bottom, right : twinsheet molded part, untrimmed - 3. Proceeding of twinsheet forming on a machine charged by hand : inserting the two sheets, clamping, moolding (after heating), demolding (after cooling), opening the clamping frames/removing the molded part (from top left to bottom right) - 4. Sophisticated 3D geometry of PE foam film : The vehicle air ducts are very lightweight and flexible. They were produced in a twinsheet process on a UAR 155g thermoforming machine - TABLES : 1. One-off molding (individual welding) versus twinsheet process : Differences when producing parts that consist of two halves - 2. Types of weld lines for twinsheet molded parts : Differences in weld line design and edge trimming En ligne : https://drive.google.com/file/d/1be2ZfxTD1Ojqvx8cqs0FV2ejQCuxufyo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28088 [article]

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Cool roofs and hollow microspheres / Jan Nordin in EUROPEAN COATINGS JOURNAL (ECJ), N° 5 (05/2019)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 5 (05/2019) . - p. 20-24 Titre : Cool roofs and hollow microspheres : Spherical micron-sized fillers help improve the elastic properties of coatings Type de document : texte imprimé Auteurs : Jan Nordin, Auteur ; Olof Sandin, Auteur ; Benjamin J. Naden, Auteur Année de publication : 2019 Article en page(s) : p. 20-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption Allongement à la rupture Charges (matériaux) Corps creux Elasticité Formulation (Génie chimique) Huiles et graisses Liants Microsphères Réflectance Réflectivité thermique Revêtements -- Propriétés mécaniques Thermoplastiques Une matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire. Toiture -- Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Low-density hollow microspheres as fil-ers in elastomeric waterproof/cool roof coatings can enhance a number of key properties. Compared with their minerai counterparts, Iow-density fillers help re-duce the weight of the coating and pro-vide a relatively strong boost to solar reflectance, reducing both the exterior surface temperature and the need for air-conditioning. Some coatings produc¬ers claim that hollow microspheres, and especially resilient hollow thermoplas¬tic microspheres, also help maintain the elastomeric properties of the binder in filled coatings. Note de contenu : - Unexpected cooling - Effect of fillers on mechanical properties - Experimental - Greater elongation at break - Oil absorption - Filler-binder considerations - Resilience makes the difference - Enhance tear strength - Adhesion results inconclusive - Fig. 1 : Elongation at break of the 5 coatings with various filler ; 100 % CaCO3 ; 50 %/50% CaCO3 and thermoplastic microspheres ; 100 % thermoplastic microspheres ; 50 %/50 % CaCO3 and glass microspheres ; 100 % glass microspheres - Table 1 : Formulations - Table 2 : Formulations continued - Table 3 : Filler volumes in the various formulations - Table 4 : Elasticity (ASTM D2370) (standard deviation in brackets) - Table 5 : Oil absorption by the fillers En ligne : https://drive.google.com/file/d/1hmVdQyOP_3zGm4HKZCw5UeWDXdCZs5uO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32522 [article]

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Drying and collapse of hollow latex / C. M. Cardinal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 4 (12/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 4 (12/2009) . - p. 457-469 Titre : Drying and collapse of hollow latex Type de document : texte imprimé Auteurs : C. M. Cardinal, Auteur ; L. E. Scriven, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2009 Article en page(s) : p. 457-469 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corps creux Latex Microscopie électronique à balayage Polymères opaques Revêtement -- Séchage:Peinture -- Séchage Index. décimale : 667.9 Revêtements et enduits Résumé : Hollow latex particles are used as white pigments for paints and paper coatings. In the coating dispersion, each hollow particle is filled with water. As the coating dries, water vacates the latex, leaving an air-filled void sized to scatter light (~0.5 µm) within each particle. Examinations of dried coatings reveal that hollow particles can collapse, decreasing their light scattering efficiency. Cryogenic scanning electron microscopy (cryoSEM) was used to characterize the microstructure of coatings containing hollow latex during drying. Images suggest latex voids empty after air invades into the coating interstitial space and collapse occurs late in the drying process. The effects of temperature (10–60°C), humidity (20–80%), and binder concentration (0–30 wt%) on particle collapse were also studied through SEM of dried coating surfaces. High drying temperature, high humidity, and low binder concentrations promoted collapse. For hollow latex particles with porous shell walls, temperature and humidity had little effect, whereas binder increased collapse. From these results, a theoretical model is proposed. During drying, diffusion of water from the particle creates a vacuum inside the latex. The vacuum is either relieved by nucleation of a gas bubble from the dissolved air in the water-filled particle or it causes the particle to collapse by buckling. DOI : 10.1007/s11998-009-9167-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9167-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7721 [article]

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

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 3 (03/2018) . - p. 53-57 Titre : Flexible blow molded parts of silicone rubber : Production of elastomeric blow molded parts using temperature-controlled die technology Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Sarah Schäfer, Auteur Année de publication : 2018 Article en page(s) : p. 53-57 Langues : Anglais (eng) Catégories : Corps creux Elastomères silicones vulcanisables à chaud Matières plastiques -- Moulage par soufflage Index. décimale : 668.4 Plastiques, vinyles Résumé : Silicone rubber cannot yet be processed by extrusion blow molding. A new approach ensures a low level of pre-crosslinking of the material, providing it with sufficient elasticity for it to be inflated to form elastic hollow bodies. This development offers economic and technical alternatives to the hollow bodies that were previously manufactured by complex conventional processes. Note de contenu : - Production of pre-crosslinked tubes - Pre-crosslinking improves blow moldability - Forming of hollow bodies with silicone rubber - Fig. 1. Structure of the die head for the blow molding of silicone rubber - Fig. 2. Parison swelling : wall thickness and diameter of the pre-crosslinked parison over the parison length as a function of pre-crosslinking degree - Fig. 3. Free inflation at 25°C parison temperature : diameter when the 13 cm long parison bursts and maximum stretching ratio depending on pre-crosslinking degree - Fig. 4. Free inflation at 25°C parison temperature : development of the outer contour of the parison : a) at 1 wt.% pre-crosslinking degree, b) at 4 wt.% pre-crosslinking degree - Fig. 5. Free inflation of the parison at different temperatures : development of the diameter as a function of time during inflation - Fig. 6. Development of the outer contour of the parison with e pre-crosslinking degree of 4 wt,% on Inflation directly after extrusion (110°C parison temperature) - Fig. 7. General development of the outer contour of the parison at 110°C during inflation in a glass bottle En ligne : https://drive.google.com/file/d/1PRrBwoUtkewMbIe_JzEuAaXgN3Wu2tay/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30265 [article]

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Fluid-powered projectile-assisted injection molding : principles and developments / T.-Q. Kuang in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 1 (03/2020)  

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Forming of thermoplastic matrix composites with gas pressure - the influence of blank holder and sheet temperature on the forming pressure and drawing ratio / Dietmar Drummer in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 2 (05/2017)  

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Hollow HP-RTM carbon fiber parts / Jansen, Tobias in JEC COMPOSITES MAGAZINE, N° 115 (08-09/2017)  

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Increasing stability with hollow structure / Eva Heiml in PLASTICS INSIGHTS, Vol. 114, N° 2-2024 (2024)  

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Manufacture hollow bodies with inlays in a single step / Peter Pokorny in KUNSTSTOFFE INTERNATIONAL, Vol. 104, N° 5 (05/2014)  

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De nouveaux procédés bien plus économiques / Jean Guilhem in PLASTIQUES & CAOUTCHOUCS MAGAZINE, N° 860 (09/2008)

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Research and application of wireless temperature measurement device in high temperature enclosed environment / Qin Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

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A surfactant-free microfluidic process for fabrication of multi-hollow polyimide aerogel particles / Y. M. Yao in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 5 (11/2020)  

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Temperature-sensitive joints for water-soluble braiding mandrels / Tobias Forssbohm in JEC COMPOSITES MAGAZINE, N° 110 (01-02/2017)  

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Theoretical study and experimental analysis of the scattering efficiency of hollow polymer particles in the dependent light scattering regime / J.-C. Auger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

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Twin-O-Sheet / Dietmar Drummer in JEC COMPOSITES MAGAZINE, N° 89 (05/2014)

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