Tesis sobre el tema "Injection molding of plastics"
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Berkery, Daniel J. (Daniel John). "Process monitoring for plastics injection molding". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12746.
Texto completoIncludes bibliographical references (leaves 196-197).
by Daniel John Berkery.
M.S.
Pham, Giang T. "Ejection force modeling for stereolithography injection molding tools". Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/18214.
Texto completoYang, Yi. "Injection molding control : from process to quality /". View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CENG%202004%20YANG.
Texto completoIncludes bibliographical references (leaves 218-244). Also available in electronic version. Access restricted to campus users.
Yao, Ke. "Energy-efficient control in injection molding /". View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CENG%202008%20YAO.
Texto completoGomes, Vincent G. (Vincent Gracias). "The dynamics and control of melt temperature in thermoplastic injection molding /". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65921.
Texto completoRios, Erick E. "Design and manufacturing of plastic micro-cantilevers by injection molding". Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/18888.
Texto completoRiddles, Mornay. "Prediction of shrinkage and warpage in injection moulded components using computational analysis". Thesis, Peninsula Technikon, 2003. http://hdl.handle.net/20.500.11838/1265.
Texto completoInjection moulding is a process by which molten polymer is forced into an empty cavity of the desired shape. At its melting point, polymers undergo a volumetric expansion when heated, and volumetric contraction when cooled. This volumetric contraction is called shrinkage. Once the mould cavity is filled, more pressure is applied and additional polymer is packed into the cavity and held to compensate for the anticipated shrinkage as the polymer solidifies. The cooling takes place via the cooling channels where the polymer is cooled until a specific ejection criterion is met. Heat from the polymer is lost to the surrounding mould, a part of this heat reaches the cooling channel surfaces, which in turn exchange heat with the circulating cooling fluid. Due to the complexity of injection moulded parts and the cooling channel layout, it is difficult to achieve balanced cooling of parts. Asymmetric mould temperature distribution causes contractions of• the polymer as it cools from its melting temperature to room temperature. This results in residual stresses, which causes the part to warp after ejection. Given the understanding of the mathematical model describing the heat transfer process during the cooling stage, the objectives of this study were three fold. Firstly, an alternative numerical model for the heat transfer process was developed. The proposed model was used to investigate the cooling stress build-up during the injection moulding process.
Chen, Xi. "A study on profile setting of injection molding /". View abstract or full-text, 2002. http://library.ust.hk/cgi/db/thesis.pl?CENG%202002%20CHEN.
Texto completoXu, Guojung. "Study of thin-wall injection molding". Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1078788946.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xxi, 238 p.; also includes graphics Includes bibliographical references (p. 231-238). Available online via OhioLINK's ETD Center
Hamilton, Jordan David. "Fabrication and analysis of injection molded plastic microneedle arrays". Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39481.
Texto completoChin, Kwai-sang. "An expert product development system for plastic injection moulding parts /". Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17545857.
Texto completoHeuzey, Marie-Claude. "The occurrence of flow marks during injection molding of linear polyethylene". Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23745.
Texto completoConley, Nancy Ann. "The dynamics of cavity pressure in thermoplastic injection molding /". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65924.
Texto completoWong, Teng. "Slicing of 3D CAD models for mould design /". Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19670424.
Texto completoNguyen, Duoc T. "Injection molding scrap reduction a study in the relationships of plastics processing methods /". Online version, 2004. http://www.uwstout.edu/lib/thesis/2004/2004nguyend.pdf.
Texto completoChang, Keh-Chyou. "Analysis Of Minimum Safe Cycle Time In Injection Molding: Selection Of Frozen Layer Thickness". Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1212609470.
Texto completoHioe, Yunior. "Mold thermal design and quasi steady state cycle time analysis in injection molding". Connect to resource, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1141840509.
Texto completoFinniss, Adam. "A parametric study of microcellular ABS foam production in the injection molding process". Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5998.
Texto completoTitle from document title page. Document formatted into pages; contains xiii, 101 p. : ill. (some col.). Includes two zip files of TIF images. Includes abstract. Includes bibliographical references (p. 93-94).
Srithep, Yottha. "A study on material distribution, mechanical properties, and numerical simulation in co-injection molding". Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1204150909.
Texto completoBuys, Alexander George. "Performance evaluation of aluminium alloy 7075 for use in tool design for the plastic industry". Thesis, Cape Peninsula University of Technology, 2009. http://hdl.handle.net/20.500.11838/1246.
Texto completoThe objective of this project was to measure the performance of high-strength aluminium alloys as injection mould material compared against conventionally used tool steel.
錢桂生 y Kwai-sang Chin. "An expert product development system for plastic injection moulding parts". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31234732.
Texto completoKaartinen, Johanna. "A Checklist for Plastic Product Design: Preventing Pitfalls in a Design Process and Premature Failures of Plastic Products". Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-9683.
Texto completoCheng, Chin-Chi 1970. "Real-time ultrasonic diagnostic technology for polymer injection molding processes". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103371.
Texto completoThe chosen IM processes are grouped to large- and small-scale 1M processes. The large-scale ones include conventional IM, co-injection molding (COIM), and fluid (gas/water) assisted injection molding (GAIM/WAIM). A filling incompleteness of 1 volume-% for IM of polycarbonate (PC) part, the core (PC) material movement and layers dimensions for COIM, the fluid motion, thickness and deformation of the hollowed high-density polyethylene (HDPE) part for GAIM/WAIM were diagnosed during processing by ultrasonic sensors and techniques developed.
The small-scale ones include IM for microfluidic device (IMMF) and micromolding (MM). The optimization of holding pressure for producing a flat polymethyl methacrylate (PMMA) part (surface roughness < 5 mum) having micro structures for IMMF, estimation of temperature of polyacetal copolymer (POM) melt in the barrel and filler concentration of nylon 66 (PA66) mixed with polyhedral oligomeric silsesquioxanes (POSS) part in the mold for MM, and evaluation of thickness variation of molded alumina ceramic powder part for MM were demonstrated. The melting stages and quality of low-density polyethylene (LDPE) in the barrel has been successfully monitored using ultrasound. The important phenomena during melting processes, such as partially melting pellets, air bubbles, melting completeness, and effects of melting temperature and rotation speed have been diagnosed by ultrasonic signatures.
These diagnostic results verify that the developed integrated HT ultrasonic sensors and techniques are capable of monitoring various IM processes to fabricate parts and products having complex formation, tiny size and micro structures, and evaluating the part quality in order to provide timely information for process optimization.
Wen, Szu-sheng 1971. "Advances in on-line ultrasonic monitoring of injection molding process". Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29784.
Texto completoA high-performance buffer rod is fabricated and calibrated as a new type of ultrasonic temperature probe to measure temperature during the extrusion process. The temperature obtained using the ultrasonic technique is comparable with calibrated conventional thermocouples. Comparison between ultrasonic sensors and conventional pressure and temperature probes is also discussed in this study.
Zhou, Feng. "In-mold melt-front rate control using capacitive transducer in injection molding /". View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CBME%202008%20ZHOU.
Texto completoSingh, Peter. "Molding behaviour and microstructure of injection molded short glass fiber reinforced polypropylene composites". Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74240.
Texto completoThis work attempts to examine quantitatively various aspects of microstructure and the effect of processing conditions in SFRTP. The matrix phase properties, such as crystallinity, morphology and molecular orientation distribution, as well as the fiber phase microstructure such as concentration, length and orientation distributions have been analyzed quantitatively, and explained. Experimental techniques, including optical and electron microscopy, differential scanning calorimetry, Fourier transform infrared spectroscopy, thermo-gravimetric analysis, etc. have been used. The results indicate complex changes in microstructure from skin to core in the injection molded samples. Both matrix and fiber phase microstructures are affected by the basic thermal and flow processes that occur during the injection molding process. A first order model has been developed to predict fiber orientation distributions, which agree well with the experimental results.
Crawford, Joseph Carlisle-Eric III. "Injection failure of stereolithography molds". Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17687.
Texto completoMcFarland, Andrew W. "Production and analysis of injection molded micro-optics components". Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/16014.
Texto completoFung, Ka Tsai. "A capacitive transducer for process and quality monitoring in injection molding /". View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CENG%202006%20FUNGK.
Texto completoHernández, Aguilar José Ramón. "Computational and experimental evaluation of two models for the simulation of thermoplastics injection molding". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ64224.pdf.
Texto completoRafizadeh, Mehdi. "Physically-based dynamic model for the control of cavity pressure in thermoplastics injection molding". Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34433.
Texto completoA lumped physically-based model was developed in order to study the behavior of the system. The model is derived from conservation laws and incorporates a physical understanding of the process. The whole system was divided into subsystems including the hydraulic system, ram-screw, barrel, and polymer delivery system. It was found necessary to account for polymer melt elasticity as well as non-Newtonian behavior of the polymer melt flow. Consideration of the growing solid skin in the polymer delivery system was found to be necessary.
The dynamics of the cavity pressure during the filling phase were investigated and found to be non-linear and time-varying in relation to the hydraulic servo-valve opening which is the manipulated variable. The dynamic behavior of the cavity pressure is approximated by piece-wise linearization of the non-linear governing equations to derive a transfer function using the physically-based model which is of fifth order. Adaptive PI, PID, and IMC controllers were designed and tested for the control of the cavity pressure. Various tuning techniques, along with changes in set-point, were used to determine conservative settings for the PI and PID controllers.
A similar approach was used to study the dynamics of the cavity pressure during the packing phase. A sixth order transfer function, with piece-wise linearization, was derived to approximate the non-linear and time-varying behavior of the cavity pressure during packing. The adaptive PI, PID, and IMC controllers were successfully applied into the packing phase. The transition of the filling-to-packing was selected to be detected by the derivative of the cavity pressure and adaptive controllers were successfully used for this phase.
Two commonly used injection molding grade thermoplastics, polyethylene and polystyrene, were used in experimental part of this work for model validation and controller testing.
Handlos, Agnita A. "The processing of microcomposites based on polypropylene and two thermotropic liquid crystalline polymers in injection molding, sheet extrusion, and extrusion blow molding". Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-164735/.
Texto completoWong, Ho Yin. "A capacitive transducer for solidification rate monitoring of polymer in injection molding /". View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CENG%202007%20WONG.
Texto completoKim, Nam Hyung. "INJECTION-COMPRESSION AND CO-INJECTION MOLDINGS OF AMORPHOUS POLYMERS: VISCOELASTIC SIMULATION AND EXPERIMENT". Akron, OH : University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1230065091.
Texto completo"May, 2009." Title from electronic dissertation title page (viewed 11/27/2009) Advisor, Avraam I. Isayev; Committee members, James L. White, Erol Sancaktar, Kevin Kreider, Minel J. Braun; Department Chair, Sadhan C. Jana; Dean of the College, Stephen Cheng; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
McFarland, Andrew W. "Production and Analysis of Polymeric Microcantilever Parts". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4895.
Texto completoNalla, Ajit R. "Closed-loop flow control approaches for VARTM". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 2.86 Mb., 89 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1430781.
Texto completoShek, Ka To. "Hot embossing-injection molding and puncture characterization of polymer hypodermic needle /". View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?MECH%202007%20SHEK.
Texto completoJangha, Sundiata. "The development of an ejection mechanism design synthesis system for rapid injection molding tools". Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/16389.
Texto completoPalmer, Anne Elizabeth. "The effect of feature geometry on the life of stereolithography molds". Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/18385.
Texto completo黃挺 y Teng Wong. "Slicing of 3D CAD models for mould design". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B29875122.
Texto completoCao, Bin. "On-line ultrasonic monitoring of injection molding and die casting processes". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ44084.pdf.
Texto completoFarhoudi, Yalda. "Measurement and computation of thermal stresses in injection molding of amorphous and crystalline polymers". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0018/NQ44426.pdf.
Texto completoLičko, Ľubomír. "Zařízení pro vstřikování plastů". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241717.
Texto completoBast, Felix. "Feasibility study and optimization of the design of an injection molded plastic bike frame". Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/20948.
Texto completoJoubert, Francois. "Rapid Tooling and the LOMOLD Process". Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1078.
Texto completoDawson, Evan Kent. "The effect of rapid tooling on final product properties". Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/11877.
Texto completoBrhel, Michal. "Technologie výroby tělesa konektoru z recyklátu". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241178.
Texto completoSanchez, Urbina Israel. "Optimizing flow of plastic PBT with 45% glass and mineral fiber reinforcement in an injection over mold process using Taguchi, CPk and mold flow simulation software approaches". To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.
Texto completoHung, Wai-chi. "The flow of polymer melts in the mould in injection moulding /". [Hong Kong : University of Hong Kong], 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13206187.
Texto completoYu, Liyong. "Experimental and numerical analysis of injection molding with microfeatures". Columbus, Ohio : Ohio State Uniersity, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1080318678.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xvi, 202 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Kurt W. Koelling, Dept. of Chemical Engineering. Includes bibliographical references (p. 196-202).