An empirical study of the surface blush in gas-assisted injection molded parts / S. J. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 1 (03/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 1 (03/2002) . - p. 60-66 Titre : An empirical study of the surface blush in gas-assisted injection molded parts Type de document : texte imprimé Auteurs : S. J. Liu, Auteur ; I.-H Lin, Auteur Année de publication : 2002 Article en page(s) : p. 60-66 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Gas-assisted injection molding of thermoplastic materials has become an important process in industry, because of its capability of producing parts that have thick and thin sections with a good structured rigidity. However, there are some unsolved problems that confound the overall success of this technique. Surface blush of the molded parts caused by glossy difference of the materials is one of them. An L’18 experimental matrix design based on the Taguchi method was conducted to investigate the surface blush of gas-assisted injection molded thermoplastics. The material used was black-pigmented polypropylene. Experiments were carried out on a 4.1 oz reciprocating injection-molding machine equipped with a high-pressure nitrogen-gas injection unit. A plate cavity with gas channels of different geometry was used to mold the parts. After molding, the surface quality of the parts was characterized by a glossmeter. For the factors selected in the main experiments, mold temperature and gas pressure were found to be the principal factors affecting the surface quality of gas-assisted injection molded parts. The surface glossy difference increases with the content of the pigment in the materials. In addition, a trapezoidal gas channel of small width was found to mold the parts with the least glossy difference. An aluminium mold helps reducing the surface blush in molded parts. Note de contenu : - Effects of processing parameters - Significance of processing parameters - Effect of pigmentation - Effect of gas channel geometry - Effect of mold material DOI : 10.3139/217.1667 En ligne : https://drive.google.com/file/d/1pYuL96FT0N3Lnjftx6YpYMMFgkeyMijN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15987 [article]

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Factors affecting the stability of gas penetration in gas assist injection molded bifurcation parts / S. J. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 3 (09/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 3 (09/2000) . - p. 297-303 Titre : Factors affecting the stability of gas penetration in gas assist injection molded bifurcation parts Type de document : texte imprimé Auteurs : S. J. Liu, Auteur ; Y. C. Wiu, Auteur Année de publication : 2000 Article en page(s) : p. 297-303 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Gas assist injection molding has become an increasingly important process in industry because of its tremendous flexibility in the design and manufacture of plastic parts. However there are some unsolved problems that confound the overall success of this technique. Unstable gas penetration in molded bifurcation parts caused by inappropriate mold/part designs and processing conditions is one of them. This report was to study the gas penetration behavior in gas assist injection molded bifurcation parts. Experiments were carried out on an 80-ton injection molding machine equipped with a high pressure nitrogen-gas injection unit. A bifurcation cavity with a part thickness of 20 mm was used for all experiments. The resin used was general purpose polystyrene to help visualize the gas penetration behavior in the parts. Various processing variables were studied in terms of their influence on the stability of gas penetration in the parts: gate position, mold layout, melt temperature, mold temperature, short shot size, gas pressure and gas injection delay time. The purpose of this study was to investigate the parameters affecting the stability of gas penetration, so that steps can be taken to optimize the gas penetration behavior. This would provide significant advantages in improving product quality. DOI : 10.3139/217.1600 En ligne : https://drive.google.com/file/d/1txauvRml6ThSk5Bk17OyPxDfviADTj_2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15835 [article]

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