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Light-curable opportunities / Virginia Read in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 17, N° 7 (07/2010)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 17, N° 7 (07/2010) . - p. 18-20 Titre : Light-curable opportunities : Light-curable materials offer several avenues to increase productivity and reduce waste over traditional systems Type de document : texte imprimé Auteurs : Virginia Read, Auteur Année de publication : 2010 Article en page(s) : p. 18-20 Langues : Américain (ame) Catégories : Adhésion Coût de production Etudes comparatives Revêtements -- Séchage sous rayonnement ultraviolet Rhéologie Thixotropie Viscosité Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Light-curable materials offer numerous opportunities to increase productivity and reduce waste in assembly operations. Instant on-demand cure, automated in-line inspection, solvent-free formulations, and the smaller footprint of the light-cure process are some of the benefits of LCMs that provide significant, positive impacts to the bottom line. Note de contenu : - Chemistry - Viscosity and thixotropy - Adhesion - Ease of processing - Quality enhancement - Process savings opportunities : Assembly labor costs - QA testing costs - Inventory costs - Floor space costs - Muliple benefits - TABLES : 1. Requirements and ideal performance criteria - 2. LCM process improvements - FIGURE : Comparative assembly costs En ligne : http://www.adhesivesmag.com/articles/88954-light-curable-opportunities Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25879 [article]

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Mercury-free polyurethane adhesives / Frank Tran in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 17, N° 7 (07/2010)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 17, N° 7 (07/2010) . - p. 21-24 Titre : Mercury-free polyurethane adhesives : Three new PU hardeners are free of mercury catalysts but offer final bonding characteristics similar to traditional mercury-containing Type de document : texte imprimé Auteurs : Frank Tran, Auteur ; Melanie Wyatt, Auteur ; Hans Kaul, Auteur Année de publication : 2010 Article en page(s) : p. 21-24 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs -- Additifs Catalyseurs métalliques Colles bi-composante:Adhésifs bi-composant Colles:Adhésifs Mercure -- Suppression ou remplacement Polyuréthanes Réticulants Réticulation (polymérisation) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : "Adhesives are social substances", writes Irving Skiest, author of Handbook of Adhesives. "They unite materials, creating a whole that is greater than the sum of parts." Adhesives bond similar or dissimilar substrates, and growth in the adhesives industry has emanated from its advantages over other joining methods. For an adhesive to bond two substrates, it must: a) wet the substrate, b) chemically bond with the substrate, and c) have good cohesive strength. It is sometimes necessary to incorporate additives to wet the surface and bond with the substrate. Keep in mind that adhesion is not a property of a material; it depends on many factors, including substrates (mainly the surface, not bulk), surface preparation, adhesive type (chemistry), specimen geometry (joint design), test method and environment. In the case of bonding zinc-coated steel with aluminum, for example, it is the aluminum and zinc surfaces that have to bond, not the steel. Due to the growing concern over the toxicity of organo-mercury compounds in the environment, there is a universal effort to replace mercury-containing polyurethane (PU) adhesives. Organo-mercury compounds are used as catalysts in PU adhesives. The PU adhesives described in this paper represent 100% solid, two-component (2K) systems. Note de contenu : - FIGURES : 1. Urethane structure - 2. Polyurethane structure - 3. Structures of various polyols (diols) and diisocyanates - 4. Density data of PU adhesive hardeners - 5. Viscosity data of PU adhesive hardeners - 6. Gel time data of PU adhesives - 7. Cure time to Reach LSS of 145 psi - 8. Cure time to Reach LSS of 1160 psi - 9. Cure profile of mercury and non-mercury catalyst in PU systems - TABLES : 1. Mix ratios of mercury and non-mercury PU adhesives - 2. Tg data of mercury and non-mercury PU adhesives En ligne : http://www.adhesivesmag.com/articles/89189-mercury-free-polyurethane-adhesives Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25880 [article]

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The evils of entrapped air / Reimund Veigel in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 17, N° 7 (07/2010)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 17, N° 7 (07/2010) . - p. 29-32 Titre : The evils of entrapped air : Air trapped in convenience cartridge packs can compromise adhesive performance Type de document : texte imprimé Auteurs : Reimund Veigel, Auteur Année de publication : 2010 Article en page(s) : p. 29-32 Langues : Américain (ame) Catégories : Adhésifs -- Application-dosage Adhésifs -- Emballages Cartouches (emballages) Conditionnement -- Défauts Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Anyone who is familiar with repackaging reactive chemicals, particularly those who use these materials in small convenience packs, will know the damaging effects entrapped air can have on the contents. Product separation, outgassing and premature hardening of the product are but a few common problems. In the case of two-component convenience cartridge packs, however, air poses an additional risk in the form of off-ratio dispensing. (Figure 1 shows an X-ray of a filled two-component cartridge that contains entrapped air.) Because air is highly compressible and most fluids are much less so, an air pocket trapped in a cartridge chamber can lead to a "time-lag" between the start of the pumping stroke and the point when material emerges from the cartridge. This is the result of the entrapped air being compressed before the fluid begins to flow. Note de contenu : - FIGURES : 1. X-ray of a filled two-component cartridge with entrapped air - 2. Areas of possible air entrapment - 3. AF piston in opened and closed positions - 4. Cutaway view of u-TAH universal cartridge before and during filling En ligne : http://www.adhesivesmag.com/articles/89537-the-evils-of-entrapped-air Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25881 [article]

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A better mix / Stephen Schmidt in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 17, N° 7 (07/2010)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 17, N° 7 (07/2010) . - p. 33-35 Titre : A better mix : Dual-axis centrifugal mixers can handle small batches of high-viscosity products quickly and efficiently Type de document : texte imprimé Auteurs : Stephen Schmidt, Auteur ; E. W. Kaufmann, Auteur Année de publication : 2010 Article en page(s) : p. 33-35 Langues : Américain (ame) Catégories : Colles:Adhésifs Malaxeurs et mélangeurs Mastics Mélanges (chimie) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The axial flow paradigm has long been one of the most predominant mechanisms of mixing. This flow pattern is generally produced by a single-shaft mixer with axial flow impellers. It is characterized by flow down the center of the batch to the bottom of the tank, which is then deflected outward toward the wall by the container bottom. It then travels up the vessel wall and back across the surface, as shown. The single-shaft mixer has limited use in the preparation of adhesives and sealants, as the axial flow patterns are difficult to reproduce in the high viscosities these products typically exhibit. When viscosity rises, mixing efficiency drops as distance from the mixing blade increases. Increasing the blade speed does little to compensate for loss of flow at the outer reaches of the tank. In addition, vortexes become deeper as speed increases, resulting in air entrainment. To overcome these limitations, multiple shafts were introduced to provide both the shear and flow necessary to produce a uniform product. Multiple-shaft mixers are common in the production of adhesives and sealants. However, these multi-shaft mixers do not produce the same flow patterns. They also require additional clean-up, limit the ability to produce small batches, and do not always mix as efficiently in small sizes as larger production machines. In many cases, the only option available has been to manually assist the mixer or manually mix altogether. Note de contenu : - Dual-axis centrifugal mixers - Surface flow - Internal flow - Real-world mixing - FIGURES : 1. Axial flow in a single-shaft mixer - 2. Interior of a dual-axis centrifugal mixer - 3. Surface flow pattern - 4. Internal flow pattern - 5. Powder, paste and liquid mixing En ligne : http://www.adhesivesmag.com/articles/89050-a-better-mix Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25882 [article]

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Adhesives & Sealants Industry - Vol. 17, N° 7 - 07/2012 URL