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Developing a UV-curable bore sealant / Mike Moore in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 19, N° 7 (07/2012)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 19, N° 7 (07/2012) . - p. 21-23 Titre : Developing a UV-curable bore sealant : A UV-curable sealant that combines lean with green is well-suited for the automotive industry Type de document : texte imprimé Auteurs : Mike Moore, Auteur Année de publication : 2012 Article en page(s) : p. 21-23 Langues : Américain (ame) Catégories : Automobiles -- Matériaux Diodes électroluminescentes Joints d'échantéité -- Séchage sous rayonnement ultraviolet Réticulation (polymérisation) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Over the past 20 years, ultraviolet (UV)-curable adhesives and sealants have made continual strides in demanding, high-speed, high-volume applications. UV-curable materials offer reduced cycle times, smaller manufacturing footprints and less energy consumption. They are also safer to use in the workplace. BACKGROUND Rotating shaft seals are used in engine, transmission and axle-sealing applications. Each seal consists of an elastomer element bonded to a metal ring or case. In some designs, the outer diameter of the metal case is exposed. When the seal is installed into the bore of the engine or transmission block, the rough surface of the bore presents a potential fluid path that could ultimately lead to a leak of the service fluid. To eliminate this leak path, a secondary sealant is applied to the outer diameter of the metal case (see Figure 1). Traditionally, this sealant has been a nitrile rubber dissolved in a flammable solvent. After application of the sealant, the seals are either passed through an oven to speed the evaporation of the solvent or are kept in a vented hood until dry, creating a high level of work in process (WIP), a demand on floor space, and, when ovens are used, added capital and operating costs. Thus, when design engineers sought a more viable process, the answer was a UV-curable sealant. But what does it take to introduce a new material into a high-volume application? The development of UV-curable sealants and adhesives requires a systematic approach that considers the interactions among the material, its application and the UV light source. En ligne : http://www.adhesivesmag.com/articles/91150-developing-a-uv-curable-bore-sealant Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18954 [article]

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Conventional and LSE bonding solutions for TPO materials / Walt Polifka in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 19, N° 7 (07/2012)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 19, N° 7 (07/2012) . - p. 24-27 Titre : Conventional and LSE bonding solutions for TPO materials : TPO materials present unique bonding challenges for PSA manufacturers due to their low-surface-energy characteristics Type de document : texte imprimé Auteurs : Walt Polifka, Auteur Année de publication : 2012 Article en page(s) : p. 24-27 Langues : Américain (ame) Catégories : Adhésifs sensibles à la pression Elastomères thermoplastiques Energie de surface Polymères Polyoléfines Une 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). Surfaces (Physique) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Thermoplastic olefin (TPO) materials belong to the larger group of thermoplastic elastomers (TPEs). As such, they come in many formulations and can be molded into parts with different surface finishes. TPOs are copolymers of ethylene, butadiene and polypropylene, which are sometimes extended with oils and are not crosslinked. The bonding challenges for a pressure-sensitive adhesive (PSA) to these materials fall into several categories due to the TPO material’s unique nature: surface energy considerations, internal contaminants to the bonding process and surface texture issues. TPOs are considered low-surface-energy materials; this means that, generally speaking, pressure-sensitive materials have a lower affinity for this surface than stainless steel or glass. Adhesive chemistries must be specifically formulated to ensure appropriate bonding. TPOs that are extended with oils may present bonding issues for PSAs if, over time, the oils migrate to the surface and interfere with the adhesive bond. Resistance to this phenomenon is usually achieved through adhesive formulation, via heavy caliper or thickness of adhesive, or a combination of the two. The TPO part itself can be molded with a textured surface for design or aesthetic purposes. This type of surface can also be problematic for PSAs since it depends on surface contact or "wetting" to achieve the appropriate bond. Textured surfaces can require greater pressure, longer dwell times and a higher caliper adhesive construction than smooth surfaces. Note de contenu : - Performance demands - Applications and challenges - Table 1 : Surface energy by substrate (dynes/cm) - Existing adhesive systems - LSE acrylic technologies - Selection and evaluation En ligne : http://www.adhesivesmag.com/articles/91151-conventional-and-lse-bonding-solution [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18955 [article]

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A virtual adhesive lab / David Horwat in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 19, N° 7 (07/2012)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 19, N° 7 (07/2012) . - p. 28-30 Titre : A virtual adhesive lab : Scientists can use computer-aided design programs to prepare waterborne adhesive formulations Type de document : texte imprimé Auteurs : David Horwat, Auteur Année de publication : 2012 Article en page(s) : p. 28-30 Langues : Américain (ame) Catégories : Adhésifs en phase aqueuse Conception assistée par ordinateur Formulation (Génie chimique) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Millions of tons of waterborne adhesive formulations are sold each year for the industrial production of myriad manufacturer and consumer products. Applications include paper packaging and converting, construction products, automotive assembly, woodworking, paper and non-woven production, and carpet or textile bonding. The formulator’s art is the creative balancing of economics vs. multiple levels of performance requirements. In this Darwinian marketplace, everything is a trade off, and “survivor” products are fueled by an optimum balance of economics and performance (vs. less ideal, perhaps older, formulations). A major factor to consider in the bonding process is the machining or processability of an adhesive system. The unique characteristics of time, temperature and pressure that are specific to each machine’s process can demand a formulation be designed for each combination of machine and substrate. Research and development efficiency requires that a point of diminishing returns be reached and a formulation be released in order to move on to another high-priority project. Each experiment in this development process may require a lab step to prepare the formulation and pass judgment on the merits of the mixture. Few tools currently exist to help with these experiments, and experience often drives the choices. Note de contenu : - Developing formulations - Adhesive system rheology - Predicting formulation features - Other possible predictions En ligne : http://www.adhesivesmag.com/articles/91153-a-virtual-adhesive-lab Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18956 [article]

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Finding the right spray adhesive / Ray Foster in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 19, N° 7 (07/2012)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 19, N° 7 (07/2012) . - p. 31-32 Titre : Finding the right spray adhesive : Composite parts require the right adhesive to achieve optimum performance Type de document : texte imprimé Auteurs : Ray Foster, Auteur Année de publication : 2012 Article en page(s) : p. 31-32 Langues : Américain (ame) Catégories : Colles:Adhésifs Composites -- Collage solvants Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Westech Aerosol Corp. takes great pride in its “boutique” approach to making aerosol adhesive products for specific applications. For years, the company has supplied a wide range of general-purpose adhesives for basic construction applications. In 2005, however, the company’s founder, David Carnahan, Ph.D., discovered that general-purpose adhesives could pose a significant risk when used to manufacture component precision parts for cars and trucks, aerospace and aircraft, boats, wind turbines, and many other demanding applications. He discovered a missing ingredient that turned a general-purpose adhesive into something that crosslinked with the fibers and resins used in making the composite parts. The new adhesive is specifically designed for the vacuum infusion process, which is being used in an ever-increasing number of applications that demand high-quality composite parts and structures. It is critical to understand that general-purpose adhesives are neither designed nor appropriate for use in the vacuum infusion process. Also significant is that contaminants found in general-purpose adhesives can act as a “release agent” between layers of composites, keeping them from bonding properly. En ligne : http://www.adhesivesmag.com/articles/91152-finding-the-right-spray-adhesive Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18957 [article]

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Improving composite door production in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 19, N° 7 (07/2012)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 19, N° 7 (07/2012) . - p. 33-34 Titre : Improving composite door production : Structural adhesives are allowing higher performance composite doors to be produced more cost effectively. Type de document : texte imprimé Année de publication : 2012 Article en page(s) : p. 33-34 Langues : Américain (ame) Catégories : Adhésifs structuraux Assemblages collés Construction -- Matériaux Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The right type of structural adhesive can produce a lower weight assembled part with superior mechanical performance characteristics such as improved flexural strength, better creep properties and higher impact resistance. These are compelling enough reasons for a manufacturing company to economically justify making design changes and rethinking production methods. The added commercial benefits of major productivity gains and overall lower production costs have convinced a number of companies to invest time and engineering resources to trial Crystic® Crestabond® and discover the performance improvements and significant cost savings they could achieve. En ligne : http://www.adhesivesmag.com/articles/91154-case-study-improving-composite-door-p [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18958 [article]

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Adhesives & Sealants Industry - Vol. 19, N° 7 - 07/2012 URL