Differential molding system for micro injection molding of thermoplastics / X. Wang in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 2 (05/2013) . - p. 159-167 Titre : Differential molding system for micro injection molding of thermoplastics Type de document : texte imprimé Auteurs : X. Wang ; P. Xie ; P. Zhang ; Y. Ding ; W. Yang Année de publication : 2013 Article en page(s) : p. 159-167 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection -- Appareils et matériel Matières plastiques -- Moulage par micro-injection Thermoplastiques -- Moulage par injection Tags : 'Moulage  différentiel'  'Matière  plastique'  micro-injection' Index. décimale : 668.4 Plastiques, vinyles Résumé : A differential molding system for micro injection molding of thermoplastics was designed and fabricated. As the core part, a planetary gear pump was integrated into the molding module and used for metering, delivering and supercharging. The molding system was installed in the stationary platen beside which a servo motor was connected to the transmission shaft of the pump through a coupling. A traditional injection molding machine which was equipped with this module could be upgraded to a precise micro injection molding machine and realized the function of multiple micro injection molding machines. A process study was first performed to verify the machine performance and to determine the influence of the main process parameters. It has been proved by experiments that the differential molding system could realize the manufacture of fine and precision parts with micro structures in one step with high efficiency at low cost. Note de contenu : - DESIGN OF DIFFERENTIAL MOLDING SYSTEM : Design ideas - Metering, delivering ans supercharging mechanism - Temperature control - Control and injection processes - EXPERIMENTAL : Experimental apparatus - Mold and part - PERFORMANCE TEST : Weight repeatibility of micro parts - Weight repeatability of injection dose - System stability DOI : 10.3139/217.2642 En ligne : https://drive.google.com/file/d/16oQkbjYxmzmlHbWGbG3xzQSLbTn8KbPS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18425 [article]

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Effect of annealing temperature on PP microporous membranes obtaines by a melt-extrusion-stretching method / Z. Y. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 4 (08/2019)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 4 (08/2019) . - p. 467-474 Titre : Effect of annealing temperature on PP microporous membranes obtaines by a melt-extrusion-stretching method Type de document : texte imprimé Auteurs : Z. Y. Liu, Auteur ; X.-T. Wu, Auteur ; J. Yan, Auteur ; W. Yang, Auteur ; M.-B. Yang, Auteur Année de publication : 2019 Article en page(s) : p. 467-474 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux) Extrusion par étirage Matériaux poreux Membranes (technologie) Polypropylène Index. décimale : 668.9 Polymères Résumé : Isotactic polypropylene (iPP) precursor film with highly oriented lamellar structure was produced through a melt extrusion-annealing-uniaxial stretching (MAUS) process. The precursor films were annealed at various temperatures and the structure evolution of precursor films during various annealing temperatures and the pore formation of the annealed film during stretching were investigated. During annealing, recrystallized lamellar structure was formed to obtain “core-shell sandwich” structure. The thickness of newly formed lamellae increased with annealing temperature, which improved the ability of slipping resistance of the original lamellar structure during stretching. As the annealing temperature of precursor film increased, the micropore shape and diameter of the final membranes became more uniform. The porosity of the microporous membranes increased with increasing annealing temperature. Note de contenu : - EXPERIMENTAL : Material and membrane preparation - Characterization - RESULTS AND DISCUSSION : Effect of annealing temperature on the lamellar structure of the precursor films - Effect of annealing temperature on the tensile deformation behavior of the precursor films - Effect of annealing on the performance of the microporous membranes - Discussion DOI : 10.3139/217.3774 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3774/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33065 [article]

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