Development of a rapid surface temperature heating system and its application to micro-injection

Detalhes bibliográficos
Autor(a) principal: Sora, Ricardo Jorge Paredes
Data de Publicação: 2014
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/35577
Resumo: Dissertação de mestrado integrado em Polymer Engineering
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spelling Development of a rapid surface temperature heating system and its application to micro-injectionDesenvolvimento de um sistema de aquecimento rápido para temperaturas de superfície e sua aplicação em micro-injeçãoHeat transferMicro-injection moldingMold surface temperatureMorphologyRapid heatingRapid coolingThermoplastic materials678.027.74620.168Engenharia e Tecnologia::Engenharia dos MateriaisDissertação de mestrado integrado em Polymer EngineeringDuring filling stage, the constant mold temperature control strategy by circling coolant through cooling channels used in conventional injection molding causes an abrupt polymer solidification close to the mold surface and consequently resulting in a frozen layer. As the viscosity increases, the mobility of the polymer to fill the cavity is largely decreased influencing the frozen orientation. This phenomenon affects greatly the dimensional stability of the part and its optical properties, especially micro-injected parts in which high aspect ratios are precluded because of premature solidification. Recently, several studies have been proposed in literature in an effort to obtain a fast and uniform heating and cooling through the mold surface during filling stage. Inspired in those studies, a new system for rapid surface heating was designed, built and applied to a cavity for microinjection molding. To prove his feasibility as well as attempting to improve results, preliminary tests were conducted comparing theoretical and practical studies. Furthermore, the system consists in a well-balanced electrical resistive thin component and an insulation layer and can increase the mold surface temperature of several tenths of celsius degrees in less than one second. Injection molding tests were then carried out comparing this and a conventional system using both amorphous and semi-crystalline materials as well as different surface temperature for two cavities with a thickness of 250 μm. Moreover, in order to check the effect of those surface heating test, specimens were characterized according to their optical (polarized light and bright-field microscopy), mechanical (tensile tests) and thermal properties (differential scanning calorimetry).Pontes, A. J.Santis, Felice dePantani, RobertoUniversidade do MinhoSora, Ricardo Jorge Paredes20142014-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/1822/35577enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:22:21Zoai:repositorium.sdum.uminho.pt:1822/35577Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:15:49.273068Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Development of a rapid surface temperature heating system and its application to micro-injection
Desenvolvimento de um sistema de aquecimento rápido para temperaturas de superfície e sua aplicação em micro-injeção
title Development of a rapid surface temperature heating system and its application to micro-injection
spellingShingle Development of a rapid surface temperature heating system and its application to micro-injection
Sora, Ricardo Jorge Paredes
Heat transfer
Micro-injection molding
Mold surface temperature
Morphology
Rapid heating
Rapid cooling
Thermoplastic materials
678.027.74
620.168
Engenharia e Tecnologia::Engenharia dos Materiais
title_short Development of a rapid surface temperature heating system and its application to micro-injection
title_full Development of a rapid surface temperature heating system and its application to micro-injection
title_fullStr Development of a rapid surface temperature heating system and its application to micro-injection
title_full_unstemmed Development of a rapid surface temperature heating system and its application to micro-injection
title_sort Development of a rapid surface temperature heating system and its application to micro-injection
author Sora, Ricardo Jorge Paredes
author_facet Sora, Ricardo Jorge Paredes
author_role author
dc.contributor.none.fl_str_mv Pontes, A. J.
Santis, Felice de
Pantani, Roberto
Universidade do Minho
dc.contributor.author.fl_str_mv Sora, Ricardo Jorge Paredes
dc.subject.por.fl_str_mv Heat transfer
Micro-injection molding
Mold surface temperature
Morphology
Rapid heating
Rapid cooling
Thermoplastic materials
678.027.74
620.168
Engenharia e Tecnologia::Engenharia dos Materiais
topic Heat transfer
Micro-injection molding
Mold surface temperature
Morphology
Rapid heating
Rapid cooling
Thermoplastic materials
678.027.74
620.168
Engenharia e Tecnologia::Engenharia dos Materiais
description Dissertação de mestrado integrado em Polymer Engineering
publishDate 2014
dc.date.none.fl_str_mv 2014
2014-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/1822/35577
url http://hdl.handle.net/1822/35577
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
_version_ 1799132605449240576

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