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Effects of injection molding holding pressure on the replication of surface microfeatures / T. R. Tofteberg in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 3 (07/2010)
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Titre : Effects of injection molding holding pressure on the replication of surface microfeatures Type de document : texte imprimé Auteurs : T. R. Tofteberg, Auteur ; H. Amédro, Auteur ; F. Grytten, Auteur ; E. Andreassen, Auteur Année de publication : 2010 Article en page(s) : p. 236-241 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection
Moulage par injection -- Défauts
PolycarbonatesTags : Polycarbonate 'Moulage par injection' 'Interférométrie de lumière blanche' (WLI) à haute résolution verticale' (HDVSI) Recuisson 'Pression possession' 'Lignes flux' 'Défauts d'injection' Index. décimale : 668.9 Polymères Résumé : The injection molding of an optical grating was studied using two different polycarbonates. The grating had period 10 μm and peak-to-valley distance ∼1 μm. Parts were molded using different holding pressures and mold temperatures. After production, the parts were annealed at 100°C. The replication was investigated using white light interferometry (WLI) before and after annealing. WLI was performed using high definition vertical-scanning interferometry (HDVSI) to resolve the details of the molded gratings with a noise level below 2 nm. It was observed that increasing the holding pressure could have either a positive or a negative effect on the replication. When the microfeatures were not fully filled, an increased holding pressure improved the definition of the features. However, for both polymers, it was observed that the replication as a function of holding pressure started to drop when the holding pressure was increased above an optimal value. This could be due to an elastic recoil occurring after releasing the holding pressure. The peak-to-valley distance of the grating was reduced after annealing. This effect was larger for parts molded using a low mold temperature. This is probably due to a higher cooling rate giving higher internal stresses, which will relax during annealing. DOI : 10.3139/217.2340 En ligne : https://drive.google.com/file/d/1Jr8pmzkZ8ZrKvyMacqDsvjly-jPSoUt-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9739
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 3 (07/2010) . - p. 236-241[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012302 - Périodique Bibliothèque principale Documentaires Disponible New HCL press for the moulding of composite materials / Javier Acosta in JEC COMPOSITES MAGAZINE, N° 112 (04-05/2017)
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Titre : New HCL press for the moulding of composite materials Type de document : texte imprimé Auteurs : Javier Acosta, Auteur Année de publication : 2017 Article en page(s) : p. 23-24 Langues : Anglais (eng) Catégories : Composites
Matériaux -- Allègement
Matières plastiques -- MoulageTags : 'Presse verticale' 'Hydraulic composite lightweight' Index. décimale : 668.4 Plastiques, vinyles Résumé : The new HCL - Hydraulic Composite Lightweight - concept developed by Fagor Arrasate is an update to the short stroke presses that were built in 1980's, designed to be able to mould different types of composite materials. Thus, it can be used in SMC, GMT, D-LFT, HP-RTM and CRTM moulding processes, as well as many other processes using vertical presses. Note de contenu : - Up to 40% height reduction
- Extremely precise control
- Reduced energy consumption
- FIGURES : 1. Slide locking system - 2. Force and parallelism cilinders integrated in the bolster - 3. Comparison between traditional and short stroke press - 4. HCL presses offer a parallel deformation of the slidePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28422
in JEC COMPOSITES MAGAZINE > N° 112 (04-05/2017) . - p. 23-24[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18856 - Périodique Bibliothèque principale Documentaires Disponible Two-dimensional spin coating with a vertical centrifugal force and the effect of artificial gravity on surface leveling / Soroosh Mahmoodi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 6 (11/2016)
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Titre : Two-dimensional spin coating with a vertical centrifugal force and the effect of artificial gravity on surface leveling Type de document : texte imprimé Auteurs : Soroosh Mahmoodi, Auteur ; Hu Guoqing, Auteur ; Mehrdad Nouri Khajavi, Auteur Année de publication : 2016 Article en page(s) : p. 1123-1137 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Résines photosensibles
Revêtement par centrifugationTags : 'Lissage de surface lisse' 'Force centrifuge verticale' Photorésist 'Couche condensée' Index. décimale : 667.9 Revêtements et enduits Résumé : This study focuses on an innovative method for spin coating called the two-dimensional (2D) spin coating method. Using a centrifugal force applied by a rotary machine perpendicular to the wafer surface body, a vertical centrifuge force (VCF) was generated. The VCF allowed controllable artificial gravity acceleration to be generated and caused the coating to face this elevated gravity acceleration to adjust and normalize the high and low surface tension stresses. Previous surface leveling mathematics were analyzed and modified. The modified calculations indicate that the effect of additional gravity exerted on the liquid’s surface can reduce the amplitude of surface leveling. To experimentally investigate this phenomenon, a 2D spin coater was designed and manufactured. Higher artificial gravity overcame some common coating defects, such as cloudiness, edge beading, inner layer bubbling, and unsmooth surface leveling. Photoresist (AZP4620) was used as the coating material. The surface roughness was analyzed by atomic force microscopy (AFM) and the layer properties were also imaged by scanning electron microscopy (SEM). The AFM results (average and root-mean-square roughness) indicated a decrease in surface leveling amplitude by increasing the VCF. SEM images showed condensed layers without any porosity or rupture. The experimental results agreed with the simulations and calculated values. Note de contenu : - DESCRIPTION OF THE 2D SPIN COATING METHOD : G acceleration and relative centrifugal force mathematics - Coating material (photoresist AZP4620) - Surface leveling mathematics DOI : 10.1007/s11998-016-9823-3 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9823-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27270
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Code-barres Cote Support Localisation Section Disponibilité 18514 - Périodique Bibliothèque principale Documentaires Disponible