{"id":19377,"date":"2024-05-07T15:49:17","date_gmt":"2024-05-07T07:49:17","guid":{"rendered":"https:\/\/firstmold.com\/?p=19377"},"modified":"2025-07-18T11:56:53","modified_gmt":"2025-07-18T03:56:53","slug":"flash-in-injection-molding","status":"publish","type":"post","link":"https:\/\/firstmold.com\/pt\/tips\/flash-in-injection-molding\/","title":{"rendered":"Flash em Moldagem por Inje\u00e7\u00e3o An\u00e1lise e Solu\u00e7\u00f5es | Defeitos de Moldagem por Inje\u00e7\u00e3o"},"content":{"rendered":"<p><a href=\"https:\/\/firstmold.com\/pt\/tips\/injection-molding-defects\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Defeitos de moldagem por inje\u00e7\u00e3o<\/strong><\/a> s\u00e3o problemas que qualquer f\u00e1brica de moldagem por inje\u00e7\u00e3o pode encontrar durante o processo de moldagem. O flash \u00e9 um defeito comum da moldagem por inje\u00e7\u00e3o.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/The-appearance-of-common-flash-in-injection-molding-production.webp\" alt=\"O aparecimento de flash comum na produ\u00e7\u00e3o de moldagem por inje\u00e7\u00e3o\" class=\"wp-image-31388\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/The-appearance-of-common-flash-in-injection-molding-production.webp 1200w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/The-appearance-of-common-flash-in-injection-molding-production-300x169.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/The-appearance-of-common-flash-in-injection-molding-production-1024x576.webp 1024w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/The-appearance-of-common-flash-in-injection-molding-production-768x432.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/The-appearance-of-common-flash-in-injection-molding-production-18x10.webp 18w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/The-appearance-of-common-flash-in-injection-molding-production-600x338.webp 600w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p>Para os projectistas de produtos ou de estruturas, a compreens\u00e3o do flash e de outros defeitos de moldagem por inje\u00e7\u00e3o ajuda-os a melhorar os seus m\u00e9todos de conce\u00e7\u00e3o e a aceitar produtos acabados ou pe\u00e7as de f\u00e1bricas de moldagem por inje\u00e7\u00e3o (consulte as normas de aceita\u00e7\u00e3o de moldagem por inje\u00e7\u00e3o).<\/p>\n\n\n\n<p>Para as f\u00e1bricas de moldes e de moldagem por inje\u00e7\u00e3o, analisar o flash e resolver este defeito na perfei\u00e7\u00e3o \u00e9 uma compet\u00eancia fundamental. Todos os profissionais de moldes e de moldagem por inje\u00e7\u00e3o t\u00eam a responsabilidade e a obriga\u00e7\u00e3o de dominar todos os defeitos de moldagem por inje\u00e7\u00e3o.<\/p>\n\n\n\n<p>Segue-se uma tabela de defeitos comuns de moldagem por inje\u00e7\u00e3o e respectivas liga\u00e7\u00f5es, que os amigos interessados podem consultar para uma compreens\u00e3o mais aprofundada:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><th class=\"has-text-align-center\" data-align=\"center\" colspan=\"5\">Compreender os diferentes defeitos de moldagem por inje\u00e7\u00e3o<\/th><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Flash<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/firstmold.com\/pt\/tips\/short-shot-in-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Tiro curto<\/strong><\/a><\/td><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/firstmold.com\/pt\/tips\/sink-marks\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Marca de pia<\/strong><\/a><\/td><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/firstmold.com\/pt\/tips\/warpage-in-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Deforma\u00e7\u00e3o\/Deforma\u00e7\u00e3o<\/strong><\/a><\/td><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/firstmold.com\/pt\/tips\/burn-marks\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Marca de queimadura<\/strong><\/a><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/firstmold.com\/pt\/tips\/splay-marks-silver-streaks-in-injeciton-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Marca de Splay\/Risco de Prata<\/strong><\/a><\/td><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/firstmold.com\/pt\/tips\/black-spots-and-black-specks\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Mancha escura\/mancha preta<\/strong><\/a><\/td><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/firstmold.com\/pt\/tips\/flow-marks\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Marca de fluxo<\/strong><\/a><\/td><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/firstmold.com\/pt\/tips\/bubbles\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Bolha<\/strong><\/a><\/td><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/firstmold.com\/pt\/tips\/weld-lines\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Linha de soldadura<\/strong><\/a><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/firstmold.com\/pt\/tips\/uneven-color-and-color-difference\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Diferen\u00e7a de cor\/Cor desigual<\/strong><\/a><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong><a href=\"https:\/\/firstmold.com\/pt\/tips\/ejector-pin-marks\/\" target=\"_blank\" rel=\"noreferrer noopener\">Marca do pino ejetor<\/a><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-flash-in-injection-molding\">O que \u00e9 o Flash na Moldagem por Inje\u00e7\u00e3o?<\/h2>\n\n\n\n<p>O flash em pe\u00e7as de pl\u00e1stico, tamb\u00e9m conhecido como rebarbas ou salpicos, refere-se ao material extra produzido durante o processo de moldagem quando o pl\u00e1stico derretido entra na fenda do molde. Este material extra est\u00e1 normalmente localizado na borda ou na superf\u00edcie da pe\u00e7a de pl\u00e1stico e parece afiado, da\u00ed o nome \"flash\" - como mostrado na imagem abaixo:<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"1000\" height=\"489\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/flash-in-injection-molded-plastic-parts.webp\" alt=\"flash em pe\u00e7as de pl\u00e1stico moldadas por inje\u00e7\u00e3o\" class=\"wp-image-19379\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/flash-in-injection-molded-plastic-parts.webp 1000w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/flash-in-injection-molded-plastic-parts-300x147.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/flash-in-injection-molded-plastic-parts-768x376.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/flash-in-injection-molded-plastic-parts-18x9.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption class=\"wp-element-caption\">flash em pe\u00e7as de pl\u00e1stico moldadas por inje\u00e7\u00e3o<\/figcaption><\/figure>\n\n\n\n<p>Os flashes nas pe\u00e7as de pl\u00e1stico ocorrem principalmente na posi\u00e7\u00e3o de separa\u00e7\u00e3o do molde, como a superf\u00edcie de separa\u00e7\u00e3o do molde, o encaixe deslizante do molde ou o encaixe deslizante do molde. <a href=\"https:\/\/firstmold.com\/pt\/guides\/what-is-an-injection-mold-slider\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>deslizador<\/strong><\/a>, o intervalo do <a href=\"https:\/\/firstmold.com\/pt\/guides\/mold-inserts\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>inserir<\/strong><\/a>e o buraco do <a href=\"https:\/\/firstmold.com\/pt\/guides\/ejector-pin\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>pino ejetor<\/strong><\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-the-impact-of-flash-on-plastic-parts\">O impacto do flash nas pe\u00e7as de pl\u00e1stico<\/h3>\n\n\n\n<p>A presen\u00e7a de flash pode afetar a qualidade e o aspeto das pe\u00e7as de pl\u00e1stico, podendo mesmo afetar o seu desempenho e vida \u00fatil. Se estes extravasamentos n\u00e3o forem resolvidos a tempo, continuar\u00e3o a expandir-se, imprimindo no molde e causando subsid\u00eancia localizada, resultando em danos permanentes. O flash no espa\u00e7o de inser\u00e7\u00e3o e no orif\u00edcio do pino ejetor tamb\u00e9m pode fazer com que a pe\u00e7a fique presa no molde, afectando <a href=\"https:\/\/firstmold.com\/pt\/tips\/demolding-process\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>desmoldagem<\/strong><\/a>. Por conseguinte, \u00e9 necess\u00e1rio tomar medidas durante a produ\u00e7\u00e3o de pe\u00e7as de pl\u00e1stico para controlar e reduzir a ocorr\u00eancia de flashes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-acceptance-standards-for-flash-on-plastic-parts\">Normas de Aceita\u00e7\u00e3o para Flash em Pe\u00e7as de Pl\u00e1stico<\/h3>\n\n\n\n<p>Em termos estritos, o flash \u00e9 inevit\u00e1vel, mas a maior parte do transbordo de pl\u00e1stico \u00e9 insignificante. Por conseguinte, \u00e9 necess\u00e1rio estabelecer uma determinada norma como refer\u00eancia aquando da aceita\u00e7\u00e3o de pe\u00e7as de pl\u00e1stico. De um modo geral, para produtos com requisitos elevados, a proje\u00e7\u00e3o n\u00e3o deve exceder <strong>0,05 mm<\/strong>para produtos com requisitos menos exigentes, o flash n\u00e3o deve exceder <strong>0,1 mm<\/strong>. A norma de aceita\u00e7\u00e3o deve ser confirmada com base na utiliza\u00e7\u00e3o efectiva do produto.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"1280\" height=\"720\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Acceptance-Criteria-for-Flash-During-Customer-Inspection-of-Injection-Molded-Products.webp\" alt=\"Crit\u00e9rios de Aceita\u00e7\u00e3o para Flash Durante a Inspe\u00e7\u00e3o pelo Cliente de Produtos Moldados por Inje\u00e7\u00e3o\" class=\"wp-image-31386\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Acceptance-Criteria-for-Flash-During-Customer-Inspection-of-Injection-Molded-Products.webp 1280w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Acceptance-Criteria-for-Flash-During-Customer-Inspection-of-Injection-Molded-Products-300x169.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Acceptance-Criteria-for-Flash-During-Customer-Inspection-of-Injection-Molded-Products-1024x576.webp 1024w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Acceptance-Criteria-for-Flash-During-Customer-Inspection-of-Injection-Molded-Products-768x432.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Acceptance-Criteria-for-Flash-During-Customer-Inspection-of-Injection-Molded-Products-18x10.webp 18w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Acceptance-Criteria-for-Flash-During-Customer-Inspection-of-Injection-Molded-Products-600x338.webp 600w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-causes-and-solutions-for-flash-in-injection-molding\">Causas e solu\u00e7\u00f5es para o flash na moldagem por inje\u00e7\u00e3o<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"720\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Four-Common-Factors-Causing-Flash-in-Injection-Molding.webp\" alt=\"Quatro factores comuns que causam o efeito de flash na moldagem por inje\u00e7\u00e3o\" class=\"wp-image-31387\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Four-Common-Factors-Causing-Flash-in-Injection-Molding.webp 1280w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Four-Common-Factors-Causing-Flash-in-Injection-Molding-300x169.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Four-Common-Factors-Causing-Flash-in-Injection-Molding-1024x576.webp 1024w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Four-Common-Factors-Causing-Flash-in-Injection-Molding-768x432.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Four-Common-Factors-Causing-Flash-in-Injection-Molding-18x10.webp 18w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Four-Common-Factors-Causing-Flash-in-Injection-Molding-600x338.webp 600w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-material-factors\">1. Factores materiais<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-analysis\">An\u00e1lise:<\/h4>\n\n\n\n<p>\u2460 O pl\u00e1stico tem uma fluidez demasiado boa e a viscosidade de fus\u00e3o \u00e9 demasiado baixa, o que o torna propenso a flashes. Por exemplo, o polietileno (PE) e o polipropileno (PP). <\/p>\n\n\n\n<p>\u2461 A mat\u00e9ria-prima pl\u00e1stica tem granularidade irregular, resultando em alimenta\u00e7\u00e3o inst\u00e1vel, levando a enchimento incompleto ou flash. <\/p>\n\n\n\n<p>\u2462 As mat\u00e9rias-primas pl\u00e1sticas com elevada absor\u00e7\u00e3o de \u00e1gua decomp\u00f5em-se a altas temperaturas, reduzindo a viscosidade da fus\u00e3o e causando flash, tais como PA, ABS, PC, PMMA, etc.<\/p>\n\n\n\n<p><em>Dicas: Clique nas liga\u00e7\u00f5es para obter informa\u00e7\u00f5es sobre \"<a href=\"https:\/\/firstmold.com\/pt\/pe-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Moldagem por inje\u00e7\u00e3o de PE<\/strong><\/a>\u201c, \u201c<a href=\"https:\/\/firstmold.com\/pt\/pp-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Moldagem por inje\u00e7\u00e3o PP<\/strong><\/a>\u201c, \u201c<a href=\"https:\/\/firstmold.com\/pt\/pa-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Moldagem por inje\u00e7\u00e3o PA<\/strong><\/a>\u201c, \u201c<a href=\"https:\/\/firstmold.com\/pt\/abs-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Moldagem por inje\u00e7\u00e3o de ABS<\/strong><\/a>\u201c, \u201c<a href=\"https:\/\/firstmold.com\/pt\/pc-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Moldagem por inje\u00e7\u00e3o de PC<\/strong><\/a>\", e \"<a href=\"https:\/\/firstmold.com\/pt\/pmma-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Moldagem por inje\u00e7\u00e3o de PMMA<\/strong><\/a>\".<\/em><\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-solution\">Solu\u00e7\u00e3o:<\/h4>\n\n\n\n<p>\u2776 Alterar o material ou adicionar aditivos para reduzir a fluidez. <\/p>\n\n\n\n<p>\u2777 Utilizar materiais com granularidade uniforme.<\/p>\n\n\n\n<p>As causas relacionadas com os materiais exigem que os projectistas de produtos ou os profissionais de moldes compreendam as caracter\u00edsticas da maioria dos materiais. A tabela abaixo mostra a fluidez dos pl\u00e1sticos mais utilizados:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Nome do material<\/th><th>Fluidez<\/th><\/tr><\/thead><tbody><tr><td>Polietileno (PE)<\/td><td>Elevado<\/td><\/tr><tr><td>Polipropileno (PP)<\/td><td>Elevado<\/td><\/tr><tr><td>Poliestireno (PS)<\/td><td>Elevado<\/td><\/tr><tr><td>Acrilonitrilo Butadieno Estireno (ABS)<\/td><td>M\u00e9dio<\/td><\/tr><tr><td>Poliamida (PA)<\/td><td>M\u00e9dio<\/td><\/tr><tr><td>Policarbonato (PC<a href=\"https:\/\/firstmold.com\/pt\/guides\/pc-plastic\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>)<\/strong><\/a><\/td><td>M\u00e9dio<\/td><\/tr><tr><td>Polioximetileno (POM)<\/td><td>M\u00e9dio<\/td><\/tr><tr><td>Tereftalato de polietileno (PET)<\/td><td>M\u00e9dio<\/td><\/tr><tr><td>Tereftalato de polibutileno (PBT)<\/td><td>M\u00e9dio<\/td><\/tr><tr><td>Poliuretano (PU)<\/td><td>M\u00e9dio<\/td><\/tr><tr><td>Cloreto de polivinilo (PVC)<\/td><td>Baixa<\/td><\/tr><tr><td>Cloreto de polivinilideno (PVDC)<\/td><td>Baixa<\/td><\/tr><tr><td>Acetato de polivinilo (PVA)<\/td><td>Baixa<\/td><\/tr><tr><td>Polimetacrilato de metilo (PMMA)<\/td><td>Baixa<\/td><\/tr><tr><td>Copol\u00edmero de polipropileno e etileno (PPE)<\/td><td>M\u00e9dio<\/td><\/tr><tr><td>Polisulfona (PSU)<\/td><td>M\u00e9dio<\/td><\/tr><tr><td>Poli\u00e9ter-\u00e9ter-cetona (PEEK)<\/td><td>Baixa<\/td><\/tr><tr><td>Polidimetilsiloxano (PDMS)<\/td><td>Baixa<\/td><\/tr><tr><td>Acetato de Etileno Vinilo (EVA)<\/td><td>M\u00e9dio<\/td><\/tr><tr><td>Elast\u00f3mero termopl\u00e1stico (TPE)<\/td><td>Elevado<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-mold-factors\">2. Factores de molde<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-analysis-0\">An\u00e1lise:<\/h4>\n\n\n\n<p>\u2460 A precis\u00e3o da superf\u00edcie de corte do molde \u00e9 fraca.<\/p>\n\n\n\n<p>A placa m\u00f3vel est\u00e1 deformada e empenada, h\u00e1 mat\u00e9rias estranhas presas na superf\u00edcie de separa\u00e7\u00e3o ou h\u00e1 rebarbas salientes \u00e0 volta da base do molde. O molde antigo tem subsid\u00eancia de fadiga em torno da cavidade devido \u00e0 compress\u00e3o de flash anterior.<\/p>\n\n\n\n<p>\u2461 O <a href=\"https:\/\/firstmold.com\/pt\/tag\/mold-design\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>conce\u00e7\u00e3o do molde<\/strong><\/a> n\u00e3o \u00e9 razo\u00e1vel.<\/p>\n\n\n\n<p>O desenho da cavidade est\u00e1 desalinhado, causando tens\u00e3o num dos lados do molde durante a inje\u00e7\u00e3o, o que resulta em flash.<\/p>\n\n\n\n<p>\u2462 O molde tem um paralelismo pobre, \u00e9 montado de forma n\u00e3o paralela, a placa n\u00e3o \u00e9 paralela ou os tirantes t\u00eam distribui\u00e7\u00e3o de for\u00e7a desigual e deforma\u00e7\u00e3o desigual, o que causa o fechamento incompleto do molde, resultando em flash. <\/p>\n\n\n\n<p>\u2463 A precis\u00e3o de correspond\u00eancia do n\u00facleo deslizante \u00e9 fraca, e o n\u00facleo fixo e a cavidade est\u00e3o desalinhados, resultando em flash. Em moldes de m\u00faltiplas cavidades, se os corredores e port\u00f5es n\u00e3o forem projetados razoavelmente, for\u00e7as de enchimento desiguais tamb\u00e9m resultar\u00e3o em flash. <\/p>\n\n\n\n<p>\u2464 O n\u00famero de portas \u00e9 demasiado pequeno.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-solution-0\">Solu\u00e7\u00e3o: <\/h4>\n\n\n\n<p>\u2776 Melhorar a precis\u00e3o do processamento e engrossar a placa do molde. <\/p>\n\n\n\n<p>Ajustar a coloca\u00e7\u00e3o de produtos. <\/p>\n\n\n\n<p>\u2778 Melhorar a precis\u00e3o do processamento e aumentar a precis\u00e3o do teste do molde; melhorar a precis\u00e3o da montagem do molde, usando o encaixe de chumbo vermelho ou chumbo azul. <\/p>\n\n\n\n<p>\u2779 Melhorar a precis\u00e3o do processamento e aumentar a precis\u00e3o do teste do molde; melhorar a precis\u00e3o da montagem do molde, usando o encaixe de chumbo vermelho ou chumbo azul. <\/p>\n\n\n\n<p>\u277a Aumentar o n\u00famero de port\u00f5es ou mudar a sua posi\u00e7\u00e3o.<\/p>\n\n\n\n<p>O flash causado por este fator envolve a disposi\u00e7\u00e3o dos canais na conce\u00e7\u00e3o do molde. <\/p>\n\n\n\n<p><em>Para mais informa\u00e7\u00f5es, consultar o artigo \"<a href=\"https:\/\/firstmold.com\/pt\/guides\/mold-runner\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Conce\u00e7\u00e3o do corredor de molde<\/strong><\/a>.\u201d<\/em><\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-reasonable-runner-design-to-solve-flash-problems\">Conce\u00e7\u00e3o razo\u00e1vel do corredor para resolver problemas de flash<\/h4>\n\n\n\n<p>2.1 Procurar o equil\u00edbrio e a simetria<\/p>\n\n\n\n<p>\u2776 Todas as cavidades devem ser enchidas simultaneamente \u00e0 mesma temperatura<\/p>\n\n\n\n<p>a. Utilizar uma disposi\u00e7\u00e3o equilibrada<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"399\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/A-balanced-layout-to-avoid-burrs.webp\" alt=\"Uma disposi\u00e7\u00e3o equilibrada para evitar rebarbas\" class=\"wp-image-19380\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/A-balanced-layout-to-avoid-burrs.webp 1000w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/A-balanced-layout-to-avoid-burrs-300x120.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/A-balanced-layout-to-avoid-burrs-768x306.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/A-balanced-layout-to-avoid-burrs-18x7.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption class=\"wp-element-caption\">Uma disposi\u00e7\u00e3o equilibrada para evitar rebarbas<\/figcaption><\/figure>\n\n\n\n<p>b. A disposi\u00e7\u00e3o n\u00e3o equilibrada pode atingir o equil\u00edbrio ajustando o tamanho da porta<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"521\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Non-balanced-layout-can-achieve-balance-by-adjusting-the-gate-size.webp\" alt=\"A disposi\u00e7\u00e3o n\u00e3o equilibrada pode atingir o equil\u00edbrio ajustando o tamanho da porta\" class=\"wp-image-19381\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Non-balanced-layout-can-achieve-balance-by-adjusting-the-gate-size.webp 1000w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Non-balanced-layout-can-achieve-balance-by-adjusting-the-gate-size-300x156.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Non-balanced-layout-can-achieve-balance-by-adjusting-the-gate-size-768x400.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Non-balanced-layout-can-achieve-balance-by-adjusting-the-gate-size-18x9.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p>\u2777 Balan\u00e7o do port\u00e3o<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"241\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Gate-balance-to-avoid-burrs-in-injection-molding.webp\" alt=\"Equil\u00edbrio do port\u00e3o para evitar rebarbas na moldagem por inje\u00e7\u00e3o\" class=\"wp-image-19382\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Gate-balance-to-avoid-burrs-in-injection-molding.webp 1000w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Gate-balance-to-avoid-burrs-in-injection-molding-300x72.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Gate-balance-to-avoid-burrs-in-injection-molding-768x185.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Gate-balance-to-avoid-burrs-in-injection-molding-18x4.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption class=\"wp-element-caption\">Equil\u00edbrio do port\u00e3o para evitar rebarbas na moldagem por inje\u00e7\u00e3o<\/figcaption><\/figure>\n\n\n\n<p>\u2778 Disposi\u00e7\u00e3o sim\u00e9trica de produtos grandes e pequenos<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"412\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Symmetrical-arrangement-to-avoid-burrs.webp\" alt=\"Disposi\u00e7\u00e3o sim\u00e9trica para evitar rebarbas\" class=\"wp-image-19383\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Symmetrical-arrangement-to-avoid-burrs.webp 1000w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Symmetrical-arrangement-to-avoid-burrs-300x124.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Symmetrical-arrangement-to-avoid-burrs-768x316.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Symmetrical-arrangement-to-avoid-burrs-18x7.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption class=\"wp-element-caption\">Disposi\u00e7\u00e3o sim\u00e9trica para evitar rebarbas<\/figcaption><\/figure>\n\n\n\n<p>\u2779 Equil\u00edbrio da for\u00e7a do molde, ou seja, o centro da press\u00e3o de inje\u00e7\u00e3o coincide com o centro do corredor principal, para evitar o flash.<\/p>\n\n\n\n<p>2.2 Manter o corredor t\u00e3o curto quanto poss\u00edvel para reduzir a taxa de desperd\u00edcio, o ciclo de moldagem e a perda de calor. A disposi\u00e7\u00e3o do tipo H \u00e9 melhor do que a disposi\u00e7\u00e3o em anel ou sim\u00e9trica.<\/p>\n\n\n\n<p>2.3 Para produtos de alta precis\u00e3o, o n\u00famero de cavidades deve ser o mais reduzido poss\u00edvel. A adi\u00e7\u00e3o de uma cavidade reduz a precis\u00e3o do produto em 4%. O n\u00famero de cavidades para moldes de precis\u00e3o geralmente n\u00e3o excede 4.<\/p>\n\n\n\n<p>2.4 A mesma cor, o mesmo material.<\/p>\n\n\n\n<p>2.5 Estrutura compacta, economizando materiais de a\u00e7o<\/p>\n\n\n\n<p>2.6 Grande perto, pequeno longe<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"466\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Big-near-small-far-layout.webp\" alt=\"Grande perto, pequeno longe\" class=\"wp-image-19384\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Big-near-small-far-layout.webp 1000w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Big-near-small-far-layout-300x140.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Big-near-small-far-layout-768x358.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Big-near-small-far-layout-18x8.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p>2.7 Altura semelhante<\/p>\n\n\n\n<p>2.8 Grande perto, pequeno longe, encaixe nos espa\u00e7os<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"525\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Large-near-small-far-fitting-in-gaps.webp\" alt=\"Grande perto, pequeno longe, encaixar nos espa\u00e7os\" class=\"wp-image-19385\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Large-near-small-far-fitting-in-gaps.webp 1000w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Large-near-small-far-fitting-in-gaps-300x158.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Large-near-small-far-fitting-in-gaps-768x403.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/Large-near-small-far-fitting-in-gaps-18x9.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p>2.9 Para o mesmo produto, grande perto, pequeno longe<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"413\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/For-the-same-product-big-near-small-far.webp\" alt=\"Para o mesmo produto, grande perto, pequeno longe\" class=\"wp-image-19386\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/For-the-same-product-big-near-small-far.webp 1000w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/For-the-same-product-big-near-small-far-300x124.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/For-the-same-product-big-near-small-far-768x317.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/05\/For-the-same-product-big-near-small-far-18x7.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption class=\"wp-element-caption\">Para o mesmo produto, grande perto, pequeno longe<\/figcaption><\/figure>\n\n\n\n<p>2.10 Boa processabilidade<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-injection-process-factors\">3. Factores do processo de inje\u00e7\u00e3o<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-analysis-1\">An\u00e1lise:<\/h4>\n\n\n\n<p>\u2460 Press\u00e3o de inje\u00e7\u00e3o demasiado elevada ou velocidade de inje\u00e7\u00e3o demasiado r\u00e1pida. Devido \u00e0 alta press\u00e3o e alta velocidade, a for\u00e7a de abertura no molde aumenta, levando ao transbordamento.<\/p>\n\n\n\n<p>\u2461 A sobrealimenta\u00e7\u00e3o leva ao flash. <\/p>\n\n\n\n<p>\u2462 A temperatura do tambor, do bocal \u00e9 demasiado elevada ou <a href=\"https:\/\/firstmold.com\/pt\/guides\/mold-temperature\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>temperatura do molde<\/strong><\/a> \u00e9 demasiado elevado, o que pode reduzir a viscosidade do pl\u00e1stico, aumentar a fluidez e causar flashes quando flui suavemente para o molde.<\/p>\n\n\n\n<p>\u2463 O tempo de espera \u00e9 demasiado longo.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-solution-1\">Solu\u00e7\u00e3o: <\/h4>\n\n\n\n<p>\u2776 Reduzir a press\u00e3o e a velocidade de inje\u00e7\u00e3o. <\/p>\n\n\n\n<p>\u2777 Reduzir a quantidade de material, pesar o peso antecipadamente ou diminuir gradualmente durante <a href=\"https:\/\/firstmold.com\/pt\/guides\/what-is-mold-trial\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>ensaio de moldes<\/strong><\/a>.<\/p>\n\n\n\n<p>\u2778 Reduzir a temperatura do cilindro, do bocal e do molde. <\/p>\n\n\n\n<p>\u2779 Reduzir o tempo de espera.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-injection-machine-factors\">4. Factores da m\u00e1quina de inje\u00e7\u00e3o<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-analysis-2\">An\u00e1lise:<\/h4>\n\n\n\n<p>\u2460 A for\u00e7a de aperto da m\u00e1quina \u00e9 insuficiente.<\/p>\n\n\n\n<p>\u2461 O ajuste do dispositivo de fixa\u00e7\u00e3o \u00e9 ruim, o mecanismo de altern\u00e2ncia n\u00e3o est\u00e1 endireitado, resultando em fixa\u00e7\u00e3o esquerda, direita ou superior, inferior n\u00e3o uniforme, paralelismo do molde ruim causando um lado firmemente preso e o outro n\u00e3o, resultando em flash durante a inje\u00e7\u00e3o.<\/p>\n\n\n\n<p>\u2462 O anel de verifica\u00e7\u00e3o est\u00e1 muito desgastado, a mola do bocal da mola falhou, o barril ou parafuso est\u00e1 excessivamente desgastado, falha do sistema de arrefecimento na porta de alimenta\u00e7\u00e3o, causando \"ponte\", alimenta\u00e7\u00e3o insuficiente de material. Al\u00e9m disso, uma almofada de amortecimento subdimensionada tamb\u00e9m pode contribuir para este problema.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-solution-2\">Solu\u00e7\u00e3o: <\/h4>\n\n\n\n<p>\u2776 Substituir por uma m\u00e1quina de inje\u00e7\u00e3o de maior tonelagem. <\/p>\n\n\n\n<p>\u2777 Verifique o aperto, repare ou substitua atempadamente, se necess\u00e1rio. <\/p>\n\n\n\n<p>\u2778 Substitua as pe\u00e7as de inje\u00e7\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Um caso t\u00edpico de flash<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-case-analysis-router-housing-flash\">An\u00e1lise de caso - Router Housing Flash<\/h3>\n\n\n\n<p>A imagem abaixo mostra um produto de habita\u00e7\u00e3o produzido por uma empresa que utiliza material de PC. Como observado, o flash \u00e9 pequeno e est\u00e1 dentro dos limites aceit\u00e1veis. No entanto, o cliente, por determinadas raz\u00f5es, solicitou a mudan\u00e7a para material PBT. Ap\u00f3s a mudan\u00e7a de material, o flash apareceu, e foi um desafio resolver o problema atrav\u00e9s do processo. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-reason-analysis-and-improvement-measures\">An\u00e1lise da raz\u00e3o e medidas de melhoria<\/h3>\n\n\n\n<p>O flash neste caso deve-se principalmente ao flash do produto resultante da substitui\u00e7\u00e3o do material sob o controlo do processo de moldagem original.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-mold-related-causes\">Causas relacionadas com o bolor:<\/h4>\n\n\n\n<p>A estrutura do produto neste caso \u00e9 simples, utilizando um \u00fanico ponto de inje\u00e7\u00e3o de porta lateral. O material anteriormente utilizado foi o PC, e as defini\u00e7\u00f5es do processo de moldagem e a abertura do molde estavam de acordo com os requisitos do material PC. O valor do extravasamento (largura da abertura) para o material PC \u00e9 de 0,06 mm, enquanto que para o material PBT \u00e9 mais pequeno, 0,02 mm. Comparando os dados, \u00e9 evidente que, se o molde for concebido para 0,06 mm, o PBT produzir\u00e1 rebarbas em \u00e1reas onde o PC n\u00e3o produzia anteriormente.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-measures-to-solve-the-above-problem\">Medidas para resolver o problema acima:<\/h4>\n\n\n\n<p>Durante a abertura do molde, respeitar o valor correto do excesso de fluxo, caso contr\u00e1rio, o molde ter\u00e1 de ser modificado.<\/p>\n\n\n\n<p><strong>Nota:<\/strong> Neste caso, apesar de os materiais PBT e PC diferirem em termos de fluidez e temperatura de inje\u00e7\u00e3o, a diferen\u00e7a no valor de extravasamento \u00e9 um facto. Por conseguinte, quando substituir materiais e conceber moldes, tenha em conta estes impactos, uma vez que os ajustes do processo podem ser dif\u00edceis.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-in-conclusion\">Em conclus\u00e3o<\/h2>\n\n\n\n<p>O flash \u00e9 um dos defeitos mais comuns da moldagem por inje\u00e7\u00e3o. Uma f\u00e1brica de moldagem por inje\u00e7\u00e3o que consegue evitar ou resolver perfeitamente os problemas de flash \u00e9 uma empresa com boa qualidade de processo. Al\u00e9m disso, muitas pe\u00e7as de pl\u00e1stico podem deparar-se com v\u00e1rios problemas em simult\u00e2neo. Por conseguinte, a familiaridade com o design estrutural, o design do molde, o teste de amostras, a an\u00e1lise e resolu\u00e7\u00e3o de problemas, bem como a garantia do aspeto e das caracter\u00edsticas do material, s\u00e3o compet\u00eancias essenciais para todos os profissionais da ind\u00fastria de moldagem por inje\u00e7\u00e3o.<\/p>\n\n\n\n<p>Se tiver alguma d\u00favida sobre o flash, n\u00e3o hesite em contactar-nos atrav\u00e9s de <a>firstmold88@gmail.com<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Compreender o defeito instant\u00e2neo na moldagem por inje\u00e7\u00e3o, come\u00e7ar pela conce\u00e7\u00e3o do produto e controlar cada passo da conce\u00e7\u00e3o do molde e da produ\u00e7\u00e3o de moldes.<\/p>","protected":false},"author":5,"featured_media":31388,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[48],"tags":[51,63],"class_list":["post-19377","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tips","tag-injection-molding","tag-injection-molding-defects"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Flash In Injection Molding<\/title>\n<meta name=\"description\" content=\"Understand the flash defect in injection molding, start from product design, and control each step of mold design and molding production.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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