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Packaging Productivity / Martha Belem Mendieta in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 17, N° 3 (03/2010)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 17, N° 3 (03/2010) . - p. 18-20 Titre : Packaging Productivity : Measuring non-pressure-sensitive adhesives’ hot tack to improve productivity in packaging processes Type de document : texte imprimé Auteurs : Martha Belem Mendieta, Auteur ; Alejandro C. Esquivel de la Garza, Auteur Année de publication : 2010 Article en page(s) : p. 18-20 Langues : Américain (ame) Catégories : Adhésifs sensibles à la pression Adhésifs thermofusibles Copolymère styrène butadiène styrène Emballages Rhéologie Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Many characterization techniques are used to measure the bond strength of hot-melt pressure-sensitive adhesives (HMPSAs). These calculations are usually performed by measuring the force required to debond the adhesive holding two substrates together. Measurement procedures vary by substrate, contact time, area and force used to make the bond ; debonding procedure variables include speed and the debonding angle. PSAs are typically soft and tacky at temperatures higher than their glass-transition temperature (Tg) ; conversely, they are firmer at lower-than-ambient temperatures. This allows tack to be measured at standard evaluation conditions (23°C and 50 % relative humidity). Unlike HMPSAs, hot-melt non-pressure-sensitive-adhesives (HMNPSAs) do not develop tack at room temperature. Instead, they become tacky when they are applied at high temperatures; after cooling to room temperature, tack is lost. Therefore, procedures commonly used to measure tack cannot be used to evaluate these materials. In some packaging processes, such as carton box forming and closure using HMAs, optimal process productivity depends on the right application temperature for optimal cohesion. Long and costly trial-and-error tests are usually used to find optimal application temperature for NPSAs for those applications. This article discusses probe-tack measurements and rheological results at high temperatures for HMNPSAs formulated with Dynasol styrene-butadiene-styrene (SBS) copolymers. En ligne : http://www.adhesivesmag.com/Articles/Feature_Article/BNP_GUID_9-5-2006_A_1000000 [...] Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8818 [article]

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Using mass spectrometry to identify polymer additives / Scott Kuzdzal in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 17, N° 3 (03/2010)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 17, N° 3 (03/2010) . - p. 21-23 Titre : Using mass spectrometry to identify polymer additives Type de document : texte imprimé Auteurs : Scott Kuzdzal, Auteur Année de publication : 2010 Article en page(s) : p. 21-23 Note générale : Bibliogr. Langues : Américain (ame) Tags : Adhésifs  Additifs  Analyse  chimique  Liquid  Chromatography  Mass  Spectrometry-Ion  Trap-Time  Of  Flight  (LCMS-IT-TOF) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Hundreds of polymers are used in thousands of plastic applications, including shelter, transportation, and food and beverage packaging. As innovation expands polymer types and uses, formulations become increasingly complex. This is because new applications almost always require additives to produce performance properties (such as toughness, flexibility, conductivity and antistatic qualities) to match polymers to applications. In addition, adding performance modifiers can cause changes in characteristics, including look, feel, color, adhesion, flammability or durability. Thus, formulators must add even more modifiers to compensate for these unwanted changes. Processing characteristics (melt point, flow, density, mold release, etc.) often necessitate additional additives. One polymer line from one manufacturer may contain dozens of different additives or additive blends among the line’s individual products, depending on each polymer’s grade and intended use. Hence, identifying additives in polymer formulations is crucial to product formulation for performance, health, safety and cost of manufacture. It also allows for analysis of competitive products and investigating alternative technologies. This article examines the use of LCMS-IT-TOF mass spectrometry to identify unknown additives in polymer formulations. En ligne : http://www.adhesivesmag.com/Articles/Feature_Article/BNP_GUID_9-5-2006_A_1000000 [...] Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8819 [article]

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Let there be LEDs in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 17, N° 3 (03/2010)

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 17, N° 3 (03/2010) . - p. 24-25 Titre : Let there be LEDs Titre original : Silicones simplify the production of energy-saving, climate-protecting light-emitting diodes Type de document : texte imprimé Année de publication : 2010 Article en page(s) : p. 24-25 Langues : Américain (ame) Catégories : Colles:Adhésifs Diodes électroluminescentes Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Light is a symbol of progress. The incandescent light bulb, once the pioneer of a global lighting revolution, is disappearing from store shelves. In tomorrow’s multimedia society, color displays the size of a house will generate crystal-clear images, and entire sports stadiums will be lit by high-performance lamps. Light can also be used as a tool. For example, laser scalpels have become an indispensable part of medical technology. These new lighting technologies are driven by energy-efficient light-emitting diodes (LEDs). WACKER’s researchers have developed an innovative UV-curing silicone that makes it relatively inexpensive to manufacture the energy-saving light sources of the futur Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8820 [article]

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Adhesives & Sealants Industry - Vol. 17, N° 3 - 03/2010 URL