Basic dyeable polyester : a new approach using a VUV excimer lamp / D. Gupta in COLORATION TECHNOLOGY, Vol. 123, N° 4 (2007)  

[article]  inCOLORATION TECHNOLOGY > Vol. 123, N° 4 (2007) . - p. 248-251 Titre : Basic dyeable polyester : a new approach using a VUV excimer lamp Type de document : texte imprimé Auteurs : D. Gupta, Auteur ; Periyasamy Siddhan, Auteur ; Abhishek Banerjee, Auteur Année de publication : 2007 Article en page(s) : p. 248-251 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Surface treatment of polyester fabric was carried out using a vacuum ultraviolet (VUV) excimer lamp. The hydrophilicity of the polyester fabric was significantly improved by surface modification, as indicated by the decrease in wetting time and wicking time. This approach can be used to create added value for polyester fabric, which otherwise suffers from low hydrophilicity. Further changes on irradiation were characterised by atomic force microscopy and the crystallinity and tensile strength of the samples were also tested. Basic dyeability of the microdenier polyester fabric was seen to improve greatly on exposure to the excimer lamp, followed by grafting with acrylic acid. The effects were observed to increase with an increase in irradiation time. The best effect was obtained for irradiation time of 10 min. These enhanced properties were accompanied by an insignificant loss in crystallinity and tensile strength of treated fabrics. DOI : 10.1111/j.1478-4408.2007.00091.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2007.00091.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3526 [article]

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A low force valve for dynamic control of molten plastics in a mold / David O. Kazmer in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 2 (05/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 2 (05/2006) . - p. 175-182 Titre : A low force valve for dynamic control of molten plastics in a mold Type de document : texte imprimé Auteurs : David O. Kazmer, Auteur ; D. Gupta, Auteur Année de publication : 2006 Article en page(s) : p. 175-182 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Polymer processing has been limited by the lack of direct flow and pressure control of the polymer melt at multiple points in space and time. Improved axial and radial valve designs are discussed that require negligible actuation force to control the flow of the pressurized melt. The forces resulting from pressure loads and shear stresses are first analyzed for an axial valve pin. Subsequently, a radial valve design is implemented and experimentally characterized using neat polycarbonate. A sigmoidal response surface is fit to the experimental data and found to very well model the observed pressure drop as a function of flow rate and valve pin position. The juncture loss at the valve port is then characterized by estimating and removing the pressure drops in the circular flow segments of the valve. Analysis indicated that the juncture loss is inversely proportional to the exposed area, or vesica piscis, formed between the circular flow channel in the valve body and the flow port on the moving valve pin. While applicable to many different polymer processing operations, the validated models are used to show the dynamic valve pin position as a function of the desired flow rate and desired cavity pressure in the hot runner of an injection mold. Finally, the impact of the designs on lower power, more compact mechanical and control system designs are discussed. DOI : 10.3139/217.0094 En ligne : https://drive.google.com/file/d/16sBfyFJyvo3ouylznVsjh8dXkdQx0m9V/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2912 [article]

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