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Mechanical dispensing system offers precision and economy in ADHESIVES AGE, Vol. 41, N° 10 (10/1998)  

[article]  inADHESIVES AGE > Vol. 41, N° 10 (10/1998) . - p. 20-22 Titre : Mechanical dispensing system offers precision and economy Type de document : texte imprimé Année de publication : 1998 Article en page(s) : p. 20-22 Langues : Américain (ame) Catégories : Colles:Adhésifs Commande pneumatique Composants électriques et électroniques -- Collage Matériaux -- Application-dosage Index. décimale : 668.3 Adhésifs et produits semblables Résumé : When it comes to dispensing adhesives for electronics assembly, hand-held and tabletop units have traditionally relied on pneumatics to "push" the material out of the syringue. There are problems with this type of dispensing; technicians have been required to live with its shortcomings and essentially work within the capabilities of the equipment. Production delays due to the need to calculate and recalculate settings, material waste, inconsistent performance and rejected parts have become expected and inherent factors in the process. This article, suupplied by Fishman Corp., Hopkinton, MA., describes a mechanical dispensing system the company has developed that eliminates the vagaries of air pressure dispensing. The system combines the precision of linear drive technology with the intelligence of microprocessor control and the cost-effectiveness and flexibility of plastic syringues. As a result, exact amounts of adhesive can be dispensed without variations in applied pressure , the effects of moisture , changing viscosity and degradation in repeatability as the amount of material is reduced within the syringue during dispensing. Before discussing the specific features and advantages of the new design, a point of reference will be established by reviewing how pneumatic systems operate. Note de contenu : - Trading performance for economy with air - Combining performance and economy with mechanical dispensing En ligne : https://drive.google.com/file/d/1AxkZq7K6gIVZO7QNyuq3K2AoMt0HKvKb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20320 [article]

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High speed application of UV cured pressure sensitive adhesives / Donald E. Albrecht in ADHESIVES AGE, Vol. 41, N° 10 (10/1998)  

[article]  inADHESIVES AGE > Vol. 41, N° 10 (10/1998) . - p. 31-33 Titre : High speed application of UV cured pressure sensitive adhesives Type de document : texte imprimé Auteurs : Donald E. Albrecht, Auteur Année de publication : 1998 Article en page(s) : p. 31-33 Langues : Américain (ame) Catégories : Adhésifs -- Séchage sous rayonnement ultraviolet Adhésifs sensibles à la pression Films plastiques Formulation (Génie chimique) Polyesters Réticulation (polymérisation) 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). Traitement corona Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The recent upsurge of user interest in UV curable adhesives, coupled with an increase in development activity at the adhesive and polymer supplier level, has generated an effort to evaluate this technology in a realworld environment. The Shell Chemical Co. , Houston, has an ongoing development effort involving 100% solid, cationic, UV curable adhesives. In conjunction with their laboratory work, pilot coating studies were undertaken. When comparing UV curing HMPSA technology with conventional HMPSA technology, certain questions often arise concerning the processing ease and type of equipment necessary for the successful use of these new polymer systems. In addition, one must address the topics of manufacturing difficulty, speeds achievable, sensitivity to UV dosage, process robustness and reproductibility. Note de contenu : - Equipment - Sustrates - Coating parameters - Test methods - Coating trials En ligne : https://drive.google.com/file/d/1tl0wv0jJ9zK3T4Ga4T13YJmGE4Gc2vXK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20322 [article]

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Emerging acrylic emulsion and UV cure processes for PSA labels / James J. Duis in ADHESIVES AGE, Vol. 41, N° 10 (10/1998)  

[article]  inADHESIVES AGE > Vol. 41, N° 10 (10/1998) . - p. 34-38 Titre : Emerging acrylic emulsion and UV cure processes for PSA labels Type de document : texte imprimé Auteurs : James J. Duis, Auteur Année de publication : 1998 Article en page(s) : p. 34-38 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs -- Séchage sous rayonnement ultraviolet Adhésifs en phase aqueuse Adhésifs sensibles à la pression Adhésifs thermofusibles Etiquettes Matières premières Polyacryliques Polymères en émulsion Index. décimale : 668.3 Adhésifs et produits semblables Résumé : As the new century unfolds, the technology of pressure sensitive acrylic emulsions is expected to change to higher solids, lower viscosity and very low volatile organic compound (VOC) systems. Furthermore 100% solids crosslinkable hot melt acrylic technology is predicted to grow significantly at the expense of the remaining solvent acrylic and rubber-based systems. These trends and the technology of these new systems are reviewed. Note de contenu : - The waterborne age - New emulsion technology - Production process - 100% solids radiation cure technology - UV cure polymerization - New UV cure acrylic hot melt technology - Improvements still to come En ligne : https://drive.google.com/file/d/1y5jchQWYEfRzKKTNcGYsrrVoTn1XPPQq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20329 [article]

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New tackifier dispersions at the cutting edge of PSAs / Nick Hemmings in ADHESIVES AGE, Vol. 41, N° 10 (10/1998)  

[article]  inADHESIVES AGE > Vol. 41, N° 10 (10/1998) . - p. 40-44 Titre : New tackifier dispersions at the cutting edge of PSAs Type de document : texte imprimé Auteurs : Nick Hemmings, Auteur Année de publication : 1998 Article en page(s) : p. 40-44 Langues : Américain (ame) Catégories : Adhésifs en phase aqueuse Adhésifs sensibles à la pression Adhésion Antimousse Dispersions et suspensions Essais (technologie) Matières premières Pelage Polyéthylène basse densité Tack à la boucle (test) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Tackifiers are readily accepted as a vital component in the formulation of optimum performance adhesives. Eka Chemicals has recently developed a new series of Snowtack[TM] tackifier dispersions for water-based pressure sensitive adhesives (PSAs) that have improved cohesive strength. The water-based segment has shown the strongest growth in the last 15 years compared to hot melt and solvent PSAs. This was initially due to lower costs, reduced flammability and environmental considerations. Continued growth has been due, in part, to the development of polymer and tackifier dispersions that meet today's technology requirements for coating, converting and performance. The key stages in the production of a water-based PSA label are as follows : - Compounding - the blending of the tackifier, polymer and other additives, such as defoamers and wetting agents; - The resultant adhesive is pumped to the coater, where the coating head could be one of many configurations but is predominantly slot die or reverse gravure; - The adhesive is applied to the carrier and passed through drying ovens at speeds of up to 500 m/min; - The dried adhesive is laminated and wound as master rolls; and - These rolls are subsequently slit into smaller rolls prior to die cutting of the label shape and design printing. Note de contenu : - Polymer - Adhesive and adhesion - Tackifier resin - Surfactant and stabilizer - Tackifiers and cohesion - New tackifier dispersions - Adhesive performance - Test procedures - Shear - Peel - Loop - Dispersion quality - Stability of tackifier dispersions En ligne : https://drive.google.com/file/d/10Umk0-kSkvLt4SVvIwIvS0Fbve6rJGJB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20330 [article]

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Finger jointing green southern yellow pine with a soy-based adhesive / Philip H. Steele in ADHESIVES AGE, Vol. 41, N° 10 (10/1998)  

[article]  inADHESIVES AGE > Vol. 41, N° 10 (10/1998) . - p. 49-56 Titre : Finger jointing green southern yellow pine with a soy-based adhesive Type de document : texte imprimé Auteurs : Philip H. Steele, Auteur ; Roland E. Kreibich, Auteur ; Petrus J. Steynberg, Auteur ; Richard W. Hemingway, Auteur Année de publication : 1998 Article en page(s) : p. 49-56 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Collage Chimie écologique Soja et constituants Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Soybean-based glues were first utilized in 1923 when a patent was granted for a soy meal-based glue. Shortly after World War II, the abundant availability of oil allowed development of soybean-derived glues that were more waterproof and insect proof. In 1994, Dr. Roland Kreibich began the development of environmentally friendly soybean glues as wood adhesives. He realized his goal of developing a waterproof exterior adhesive for wood finger joints as a substitute for petroleum-based adhesives. The adhesive he developed is applied as a honeymoon system with the soy-based hydrolyzate applied to one side of a finger joint and a phenol-resorcinol-formaldehyde (PRF) adhesive applied to the other. When these fingers are brought together, the resultant mixture in the joint forms a gel within 5-10 sec. This gelation allows finger-jointed lumber to be handled immediately. The honeymoon adhesive system was first tested in the western United States on Douglas fir lumber with excellent results. The Western Wood Products Association has certified the honeymoon system for "vertical use only" at Willamina Lumber Co. in Willamina, Ore. There was some reason to suspect that finger jointing of southern yellow pine (SYP) with the honeymoon system using soy-based adhesive (SBA) might prove more difficult than for western species. The Wood Handbook (1) classes western species in the "bond easily" or "bond well" category, whereas SYP is ranked in the "bond satisfactorily" category. On the other hand, the specific gravity and the green moisture content of SYP (Table I) are nearly identical to those of Douglas fir, a western species that has shown good results with green finger jointing in both laboratory and mill trials. Laboratory and mill trial results soon indicated that results of the honeymoon system with SYP were just as favorable as with western species. Note de contenu : - Laboratory tests - Mill trials - Future applications En ligne : https://drive.google.com/file/d/1eHzWiILrF-oTfFkBFbsbk1xMUF6EHZp3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20331 [article]

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