An improvement on design of sheet extrusion dies / G.-J. Yang in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 4 (12/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 4 (12/2005) . - p. 336-344 Titre : An improvement on design of sheet extrusion dies Type de document : texte imprimé Auteurs : G.-J. Yang, Auteur ; J.-B. Chen, Auteur ; C.-Y. Shen, Auteur ; X.-C. Huang, Auteur Année de publication : 2005 Article en page(s) : p. 336-344 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : On the basis of the method of representative values and the flow pattern, that is, the position of the isobars parallels to the die orifice (PIPDO), the design of dies for the sheet and annular parisons is improved in the present paper. Since this pattern includes the effects of the sloped manifold and the die design for the circular manifold are independent of flow rate and the polymer viscosity, the distribution system of a die gives better uniformity of flow. In the previous study [1] a defect is found, that is, the calculated position of the path of the island area lags behind actual position. This defect is eliminated, and the modified equation is obtained. Another flow pattern, the pressure loss on all flow path is equal (PLFPE), is introduced. The equivalency of the above two flow patterns is proved theoretically. Although the flow uniformity isn’t perfect in the simplified analytical design of dies proposed in the previous paper, this simplified design is still of advantages. Therefore, its design criterion is put forward in this paper. En ligne : https://drive.google.com/file/d/1wOkJbL1zLR1BMMGVryTzbVLkfWgwRJM2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2958 [article]

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Influence of process parameters on the morphologies of micro-injection molded polyformaldehyde parts / L.-X. Wang in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 3 (07/2019)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 3 (07/2019) . - p. 367-375 Titre : Influence of process parameters on the morphologies of micro-injection molded polyformaldehyde parts Type de document : texte imprimé Auteurs : L.-X. Wang, Auteur ; D.-F. Wang, Auteur ; Lixia Jiang, Auteur ; N. Bian, Auteur ; Q. Li, Auteur ; C.-Y. Shen, Auteur Année de publication : 2019 Article en page(s) : p. 367-375 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par micro-injection Morphologie (matériaux) Polyoxyméthylène Index. décimale : 668.4 Plastiques, vinyles Résumé : The morphologies of micro-injection molded parts are influenced by the process parameters. In this paper, the influence of injection speed, mold temperature and melt temperature on the morphologies of micro-injection molded polyformaldehyde (POM) parts with different thicknesses were investigated by a single factor experimental method; the morphological structure of the parts was characterized by polarized light microscopy. The scale effect on the crystallization behavior and internal morphology of micro-injection POM parts was analyzed. The results indicated that the scale effect had a great influence on the hierarchical morphology in the thickness direction of the parts. The micro-parts with a thickness of 1.0 mm showed a skin-core structure including the skin layer, fine grain layer, oblate spherulite, and spherulite core layer, and the micro-parts with a thickness of 0.2 mm showed a skin-core structure with the skin layer, fine grain layer, and the spherulite core layer, and a larger thickness ratio of the spherulite core layer. As injection speed, mold temperature and melt temperature increase, the fine grain layer gradually disappears and the size of core spherulite tends to become larger, the thicknesses of the skin layer of all the micro-parts decrease and that of the 0.2 mm micro-parts decreases significantly. Note de contenu : - EXPERIMENTAL PART : Materials - Micro-parts and mold design - Sample preparation and characterization methods - RESULTS AND DISCUSSION : Effect of injection speed on morphological structure of POM micro-injection molded parts - Effect of melt temperature on morphological structure of POM micro-injection parts - Effect of mold temperature on morphological structure of POM micro-injection molded parts DOI : https://doi.org/10.3139/217.3776 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3776/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32898 [article]

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