Analytical and numerical solutions of Oldroyd 8-constant fluid in double-layer optical fiber coating / Zeeshan Khan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 1 (01/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 1 (01/2019) . - p. 235-248 Titre : Analytical and numerical solutions of Oldroyd 8-constant fluid in double-layer optical fiber coating Type de document : texte imprimé Auteurs : Zeeshan Khan, Auteur ; Haroon Ur Rasheed, Auteur ; Murad Ullah, Auteur ; Taza Gul, Auteur ; Akhtar Jan, Auteur Année de publication : 2019 Article en page(s) : p. 235-248 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse numérique Composites à fibres Fibres optiques Humide sur humide (revêtements) Optimale homotopique asymptotique, Méthode Revêtements multicouches Revêtements organiques Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : Polymer flow during wire coating in a pressure-type casting die has been simulated under non-isothermal conditions. The flow is dependent on the wire velocity, geometry of the die, and the viscosity of the polymer. In the present study, the constitutive equation of an Oldroyd 8-constant fluid is used to characterize the rheology of the polymer melt. The equation describing the flow of polymer melt inside the die is solved (1) analytically by applying optimal homotopy asymptotic method (OHAM) and (2) numerically by the shooting method with Runge–Kutta–Fehlberg algorithm. The convergence of the series solution is established. The effect of physical characteristics of the problem has been discussed in detail through graphs by assigning numerical values for several parameters of interest. At the end, the present study is also compared with published work as a particular case and good agreement is found. Note de contenu : - Basic equations and the problem formulation - OHAM solution - Numerical solution DOI : 10.1007/s11998-018-0113-0 En ligne : https://link.springer.com/article/10.1007/s11998-018-0113-0 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31994 [article]

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Blood samples with origin code / Martin Manka in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 5 (05/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 5 (05/2019) . - p. 6-7 Titre : Blood samples with origin code : Jako medic : Patented wet-in-wet process for freeze-stored blood sample tubes Type de document : texte imprimé Auteurs : Martin Manka, Auteur Année de publication : 2019 Article en page(s) : p. 6-7 Langues : Anglais (eng) Catégories : Echantillons biologiques Humide sur humide (revêtements) Matériel médical Matières plastiques -- Moulage par injection Polymères en médecine Polypropylène Production en série Technologie médicale Tubes Index. décimale : 668.4 Plastiques, vinyles Résumé : Jako meditec specializes in the injection molding of tubes, with closure caps and racks, in which blood samples from blood donors are kept deep-frozen for many years. Each sample can be uniquely traced thanks to a DM code. The two-component tubes are produced using a special, patented wet-in-wet injection molding process. Note de contenu : - Special wet-in-wet process developed - Production cell docked to cleanroom - One-hundred percent traceable - Picture : In the cleanroom, some of the products are subjected to an optical follow-up inspection - Fig. 1 : Jako produces around, 1,5 million tubes a month with the patented wet-in-wet process - Fig. 2 : The handling of the molded parts, including set-down according to the cavity pattern, is performed by a six-axis robot. After deposition, the tubes are fed directly into the cleanroom with compressed air via hoses En ligne : https://drive.google.com/file/d/147N90VfkvLXu9mFxd-h5RYT2Kr58CBXX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32545 [article]

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Changing industry dynamics towards eco high solid coatings and lean process friendly in PAINTINDIA, Vol. LXX, N° 10 (10/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 10 (10/2020) . - p. 66-78 Titre : Changing industry dynamics towards eco high solid coatings and lean process friendly Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 66-78 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés organiques volatils Copolymère acrylique mélamine Haut extrait sec Humide sur humide (revêtements) Polyuréthanes Primaire (revêtement) Revêtements bi-composant Revêtements en phase aqueuse Revêtements organiques Rhéologie Vernis bi-composant Vernis en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : The automotive industry has undergone incredible changes by ways of material and process development. Different driving forces behind the development of better and more efficient process have brought dramatic changes over last 100 years. Number of applied coatings layers has been reduced to 3 layers. The latest development of wet on wet coating technology coating machines automatic cleaning process the time taken for the body painting reduced to 8 hr. Emission of volatile organic compounds (VOC) is main problem for coating industry considering the fact increase in the solid content which increase covering capacity of coating and decrease in solvent content in solvent borne formula is implemented the relative increase of solid by 20% generated completely new technology i.e. High solid technology. Note de contenu : - VOC REDUCTION DATA FROM YEAR 1965 TO 2005 - THREE COAT SYSTE IN AUTOMOTIVE FIELD : Primer - Three technologies have now been established - TECHNOLOGICAL REQUIREMENTS : Film properties - Mechanical properties - Liquid primers - Powder primer - Top coats - Pigments and color - Single-stage top coats (monocoats) - Base coats - Base coat rheology - Low and medium solids base coat - High solids (HS) base coats - Waterborne base coats - Global conversion to waterborne base coat technology - Clear coat - Liquid clear coats - One-component (1K) acrylic melamine clear coat - Two-component (2K) polyurethane clear coat - Waterborne clear coat - Powder clear coat - Following other advantages - PROCESS COMPARISON En ligne : https://drive.google.com/file/d/10BTHrLl6X0Z6gwpZ_Rld_DzeG6vpSalj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34669 [article]

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Polyamine curing agents meeting the industry need for enhanced productivity / Michael Cook in COATINGS TECH, Vol. 16, N° 3 (03/2019)  

[article]  inCOATINGS TECH > Vol. 16, N° 3 (03/2019) . - p. 42-54 Titre : Polyamine curing agents meeting the industry need for enhanced productivity Type de document : texte imprimé Auteurs : Michael Cook, Auteur ; Sudhir Ananthachar, Auteur ; Zheng Shiying, Auteur Année de publication : 2019 Article en page(s) : p. 42-54 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Analyse thermique Anticorrosifs Anticorrosion Composés polycycliques Décollement cathodique (revêtement) Epoxydes Essais de brouillard salin Essais de résilience Formulation (Génie chimique) Humide sur humide (revêtements) Marines (peinture) Polyamines Polycarbamide Primaire (revêtement) Réticulants Revêtements -- Séchage sous rayonnement infrarouge proche Revêtements antisalissures:Peinture antisalissures Revêtements bi-composant Transition vitreuse Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : In the challenging world of industrial, protective, and marine coatings, two-component (2K) epoxy systems are established as the benchmark technologies due to the combined offerings of excellent corrosion protection and compliance with regional volatile organic compound standards. Today, productivity has emerged as a major driver, and innovation focuses on developing epoxy coatings that have greater application versatility while providing enhanced performance properties, such as dry speed, rapid recoat, and through-cure. For marine and protective coatings, the need is for faster cure and blush-resistant coatings when applied under adverse, low temperatures conditions. In the OEM sector, the wet-on-wet application process means there is a requirement for epoxy systems to provide rapid overcoatability with polyurethane and/or polycarbamide topcoats within minutes after initial application of the primer. In this sector, the drivers are to increase overall productivity with faster application of multiple layers coupled with lower bake temperatures which can provide energy savings. This article will focus on the performance attributes of a novel polycyclic-aliphatic amine and its use in the development of new epoxy curing agents designed to provide benefit in the above markets. The supporting data includes the functional properties thermal analysis, glass transition (Tg ), and infrared (IR)-cure profile, confirming the rapid through-cure and crosslinking capabilities in epoxy systems. In addition, a review of model coating formulations and their key performance attributes, including the rapid recoat times, improved intercoat adhesion, and excellent corrosion protection properties will be discussed. Note de contenu : - Key features and benefits of the poly[HCA]amine building block - Fast property development of poly[HCA]amine - Fundamental study of fast cure mechanism of poly[HCA]amine - New polycyclic polyamide curing agents - Novel polyamide curing agents for wet-on-wet applications - Rapid recoat study using polycarbamides - Anti-corrosive primer formulation - Accelerated corrosion resistance - Cathodic disbondment - Table 1 : Properties of poly[HCA]amine - Table 2 : Summary of clear coating properties - Table 3 : Typical handling properties of rapid dry polycyclic amine polyamides - Table 4 : Tg and Mc from DMA analysis of polyamide systems - Table 5 : Base handling and performance properties of polyamide systems - Table 6 : Time to cure properties of traditional and rapid cure polyamides - Table 7 : Wet and dry adhesion properties of epoxy primers with epoxy topcoats - Table 8 : Wet/dry adhesion properties of epoxy primers with poycarbamide topcoats En ligne : https://drive.google.com/file/d/1QhY8BfKMwkQKGlF9GDpNy-kJlzV0LDr_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32046 [article]

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Theoretical prediction on double-layer coating in wet-on-wet optical fiber coating process / kyoungjin Kim in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 1 (01/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 1 (01/2011) . - p. 35-44 Titre : Theoretical prediction on double-layer coating in wet-on-wet optical fiber coating process Type de document : texte imprimé Auteurs : kyoungjin Kim, Auteur ; Ho Sang Kwak, Auteur ; Sang Hee Park, Auteur ; Yeong Seop Lee, Auteur Année de publication : 2011 Article en page(s) : p. 35-44 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ecoulement laminaire Ecoulement visqueux Fibres optiques Humide sur humide (revêtements) Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : A theoretical investigation is conducted on the wet-on-wet (WOW) process for double-layer resin coating of optical glass fiber. The coating process in the secondary coating die is modeled as a simple two-layer Couette flow of two immiscible fluids in an annulus with an assigned pressure gradient. The assumption of fully developed flow permits an exact solution to the Navier–Stokes equations. The solution discloses the relevant parameters in design and operation of a WOW coating applicator of optical fiber. For a given diameter of glass fiber and primary coating thickness, the secondary coating thickness is a function of the applied pressure gradient, the diameter of coating die, the viscosity ratio, and the fiber drawing speed. The influences of each of these control parameters on double-layer coating are scrutinized. A practical concept of thermal control of the coating process utilizing temperature-dependent viscosity of coating resins is explored. DOI : 10.1007/s11998-010-9272-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9272-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10920 [article]

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