{"id":19415,"date":"2024-05-08T17:43:12","date_gmt":"2024-05-08T09:43:12","guid":{"rendered":"https:\/\/firstmold.com\/?p=19415"},"modified":"2026-01-21T14:04:10","modified_gmt":"2026-01-21T06:04:10","slug":"burn-marks","status":"publish","type":"post","link":"https:\/\/firstmold.com\/pt\/tips\/burn-marks\/","title":{"rendered":"Marcas de queimaduras na moldagem por inje\u00e7\u00e3o de pl\u00e1stico"},"content":{"rendered":"

As marcas de queimaduras n\u00e3o s\u00e3o comuns defeito na moldagem por inje\u00e7\u00e3o<\/strong><\/a>. Como resultado, muitos profissionais da ind\u00fastria de moldes e de moldagem por inje\u00e7\u00e3o n\u00e3o est\u00e3o muito familiarizados com ela. Embora as marcas de queimadura n\u00e3o estejam relacionadas com a estrutura do produto, a FirstMold continua a apelar aos projectistas de produtos, projectistas estruturais e projectistas mec\u00e2nicos para que adquiram algum conhecimento sobre o assunto.<\/p>\n\n\n\n

Se estiver interessado noutros defeitos de moldagem por inje\u00e7\u00e3o, n\u00e3o hesite em clicar nas liga\u00e7\u00f5es do quadro abaixo para obter mais informa\u00e7\u00f5es.<\/p>\n\n\n\n

Compreender os diferentes defeitos de moldagem por inje\u00e7\u00e3o<\/th><\/tr>
Flash<\/strong><\/a><\/td>Tiro curto<\/strong><\/a><\/td>Marca de pia<\/strong><\/a><\/td>Deforma\u00e7\u00e3o\/Deforma\u00e7\u00e3o<\/strong><\/a><\/td>Marca de queimadura<\/strong><\/td><\/tr>
Marca de Splay\/Risco de Prata<\/strong><\/a><\/td>Mancha escura\/mancha preta<\/strong><\/a><\/td>Marca de fluxo<\/strong><\/a><\/td>Bolha<\/strong><\/a><\/td>Linha de soldadura<\/strong><\/a><\/td><\/tr>
Diferen\u00e7a de cor\/Cor desigual<\/strong><\/a><\/td>Marca do pino ejetor<\/a><\/strong><\/td><\/td><\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

O que s\u00e3o marcas de queimadura na moldagem por inje\u00e7\u00e3o?<\/h2>\n\n\n\n

As marcas de queimadura referem-se a marcas escuras ou pretas que se formam no final do percurso do fluxo ou em \u00e1reas de g\u00e1s preso durante o processo de moldagem por inje\u00e7\u00e3o devido a uma ventila\u00e7\u00e3o deficiente do molde ou a uma inje\u00e7\u00e3o demasiado r\u00e1pida, em que o ar no interior do molde n\u00e3o tem tempo para sair e aquece subitamente sob alta press\u00e3o (em casos extremos, as temperaturas podem atingir os 3000 graus). O ar comprimido sobreaquecido queima a massa fundida.<\/p>\n\n\n\n

\"Marcas
Marcas de queimadura na nervura da pe\u00e7a de pl\u00e1stico moldada<\/figcaption><\/figure>\n\n\n\n

As marcas de queimadura afectam o produto?<\/h3>\n\n\n\n

As marcas de queimadura em pe\u00e7as moldadas por inje\u00e7\u00e3o podem afetar o aspeto e a qualidade do produto. As \u00e1reas afectadas podem apresentar cores e texturas diferentes, como ficarem pretas, amarelas ou \u00e1speras, o que pode reduzir o apelo est\u00e9tico do produto; como mostra a imagem abaixo, a apar\u00eancia \u00e9 significativamente afetada ap\u00f3s a ocorr\u00eancia de marcas de queimadura;<\/p>\n\n\n\n

As marcas de queimaduras nas pe\u00e7as moldadas por inje\u00e7\u00e3o podem tamb\u00e9m afetar o desempenho e a fiabilidade do produto. As \u00e1reas afectadas podem alterar as propriedades f\u00edsicas e qu\u00edmicas das pe\u00e7as moldadas por inje\u00e7\u00e3o, tais como a redu\u00e7\u00e3o da sua for\u00e7a, resist\u00eancia ao calor ou resist\u00eancia \u00e0 corros\u00e3o, o que pode afetar a capacidade de utiliza\u00e7\u00e3o do produto;<\/p>\n\n\n\n

As marcas de queimadura nas pe\u00e7as moldadas por inje\u00e7\u00e3o podem tamb\u00e9m afetar a efici\u00eancia da produ\u00e7\u00e3o e o controlo dos custos; os problemas de marcas de queimadura podem levar \u00e0 demoli\u00e7\u00e3o ou ao retrabalho das pe\u00e7as moldadas por inje\u00e7\u00e3o, aumentando os custos de produ\u00e7\u00e3o.<\/p>\n\n\n\n

Causas das marcas de queimaduras <\/h2>\n\n\n\n

4. Impacto das mat\u00e9rias-primas <\/h3>\n\n\n\n

a) Elevado teor de humidade e de subst\u00e2ncias vol\u00e1teis nas mat\u00e9rias-primas.<\/p>\n\n\n\n

b) \u00cdndice de fus\u00e3o elevado, boa fluidez da massa fundida, o que dificulta a expuls\u00e3o de gases.<\/p>\n\n\n\n

c) Aditivos pl\u00e1sticos, corantes que contenham subst\u00e2ncias vol\u00e1teis e humidade, n\u00e3o resistentes a temperaturas elevadas que provoquem a decomposi\u00e7\u00e3o.<\/p>\n\n\n\n

Medidas de melhoria para marcas de queimaduras<\/h2>\n\n\n\n

1. As marcas de queimaduras ocorrem durante as injec\u00e7\u00f5es vazias <\/h3>\n\n\n\n

a) Verificar se o bico est\u00e1 entupido. <\/p>\n\n\n\n

b) Verificar se h\u00e1 danos no parafuso, no anel de controlo, no tambor, etc. <\/p>\n\n\n\n

c) Verificar se existem anomalias no sistema de aquecimento, nas linhas dos sensores de temperatura, nos termopares, nos an\u00e9is de aquecimento e na regula\u00e7\u00e3o da temperatura de plastifica\u00e7\u00e3o. <\/p>\n\n\n\n

d) Verificar se o p\u00f3 de cor da mat\u00e9ria-prima, o masterbatch, etc., cont\u00eam subst\u00e2ncias facilmente decompon\u00edveis e considerar a substitui\u00e7\u00e3o de materiais diferentes para eliminar o problema. <\/p>\n\n\n\n

e) Verificar se a contrapress\u00e3o \u00e9 demasiado elevada, se a velocidade de rota\u00e7\u00e3o do armazenamento \u00e9 demasiado elevada ou se o tempo de pr\u00e9-plastifica\u00e7\u00e3o \u00e9 demasiado longo, provocando a decomposi\u00e7\u00e3o e a carboniza\u00e7\u00e3o da mat\u00e9ria-prima. <\/p>\n\n\n\n

2. Marcas de queimadura no molde <\/h3>\n\n\n\n

a) Para moldes de canais quentes<\/strong><\/a>, Verifique se existem anomalias na pr\u00f3pria c\u00e2mara quente e no controlo da temperatura.<\/p>\n\n\n\n

b) Nos moldes de canal frio, verificar se o canal e a comporta est\u00e3o danificados, etc. <\/p>\n\n\n\n

3. Marcas de queimadura no produto <\/h3>\n\n\n\n

a) Se ocorrerem marcas de queimadura nas extremidades do produto, considere aumentar a ventila\u00e7\u00e3o e reduzir a velocidade de inje\u00e7\u00e3o. <\/p>\n\n\n\n

b) Se as marcas de queimadura ocorrerem no meio do produto, considere a possibilidade de alterar a inser\u00e7\u00e3o de escape ou de adicionar um pino ejetor de escape e utilize a inje\u00e7\u00e3o segmentada no processo, reduzindo a velocidade de inje\u00e7\u00e3o no local da marca de queimadura.<\/p>\n\n\n\n

c) Se ocorrerem marcas de queimadura na extremidade traseira do produto, recomendamos a limpeza das ranhuras de ventila\u00e7\u00e3o do molde e a redu\u00e7\u00e3o da for\u00e7a de aperto.<\/p>\n\n\n\n

An\u00e1lise de caso de marcas de queimaduras<\/h2>\n\n\n\n
\"Imagem
Imagem de caso de marcas de queimaduras de produtos<\/figcaption><\/figure>\n\n\n\n

Introdu\u00e7\u00e3o ao produto<\/h3>\n\n\n\n

A imagem acima mostra um caso de marcas de queimadura de produto. A imagem da direita \u00e9 um grande plano da imagem da esquerda.<\/p>\n\n\n\n

O material do produto \u00e9 PBT, um tipo de produto de liga\u00e7\u00e3o com paredes espessas e uma superf\u00edcie de aspeto secund\u00e1rio. Devido aos requisitos de alta qualidade do cliente, n\u00e3o s\u00e3o aceit\u00e1veis defeitos vis\u00edveis na superf\u00edcie do produto.<\/p>\n\n\n\n

As condi\u00e7\u00f5es de moldagem s\u00e3o as seguintes.<\/p>\n\n\n\n

a. Temperatura de moldagem do molde: 60\uff5e80\u2103.<\/p>\n\n\n\n

b. Temperatura do material: 240\uff5e260\u2103.<\/p>\n\n\n\n

c. Velocidade de inje\u00e7\u00e3o em tr\u00eas fases: primeira fase a 180 mm\/s, segunda fase a 135 mm\/s, terceira fase a 40 mm\/s.<\/p>\n\n\n\n

d. Tempo de inje\u00e7\u00e3o: 1,5\uff5e3s.<\/p>\n\n\n\n

e. Press\u00e3o de inje\u00e7\u00e3o: 1300\uff5e1500kgf\/cm\u00b2.<\/p>\n\n\n\n

Problemas com o produto<\/h3>\n\n\n\n

A imagem do produto mostra ligeiras marcas de queimadura no interior do c\u00edrculo vermelho, o que o cliente n\u00e3o aceita.<\/p>\n\n\n\n

Raz\u00f5es e estrat\u00e9gias<\/h3>\n\n\n\n

(1) An\u00e1lise da causa<\/strong><\/p>\n\n\n\n

Durante a primeira ensaio de moldes<\/strong><\/a>Ap\u00f3s uma an\u00e1lise do modelo de fluxo, verificou-se que a localiza\u00e7\u00e3o das marcas de queimadura na linha de fus\u00e3o final do produto se devia principalmente ao facto de os gases n\u00e3o conseguirem sair da posi\u00e7\u00e3o marcada na cavidade do molde, provocando marcas de queimadura de g\u00e1s retido.<\/p>\n\n\n\n

(2) Estrat\u00e9gias de solu\u00e7\u00e3o<\/strong><\/p>\n\n\n\n

Uma vez que as estruturas do produto e do molde j\u00e1 foram confirmadas pelo cliente e n\u00e3o podem ser alteradas, o problema s\u00f3 pode ser resolvido atrav\u00e9s do ajuste da ventila\u00e7\u00e3o do molde e dos processos de moldagem por inje\u00e7\u00e3o.<\/p>\n\n\n\n

Expanda as ranhuras de ventila\u00e7\u00e3o no percurso do fluxo do molde, na superf\u00edcie de separa\u00e7\u00e3o do molde e nos pinos ejectores tanto quanto poss\u00edvel, reduzindo a quantidade de ventila\u00e7\u00e3o final para aliviar a gravidade das marcas de queimadura.<\/p>\n\n\n\n

Ajustar o processo de moldagem por inje\u00e7\u00e3o para inje\u00e7\u00e3o em v\u00e1rias fases. Devido \u00e0 espessura do produto, utilizar uma velocidade baixa ou mesmo velocidades mais baixas durante as duas \u00faltimas fases de inje\u00e7\u00e3o para reduzir a gravidade das marcas de queimadura.<\/p>\n\n\n\n

Palavras finais<\/h2>\n\n\n\n

Eu sou Lee Young da FirstMold, trabalhando diligentemente todos os dias. Com base em livros, manuais e experi\u00eancia pr\u00e1tica em oficinas, resumi muitos conjuntos de experi\u00eancias de trabalho para facilitar a refer\u00eancia e a aprendizagem. Para aqueles que est\u00e3o a aprender sobre moldagem por inje\u00e7\u00e3o, moldes, design estrutural de produtos e design de moldes, \u00e9 importante ler, praticar e tentar mais, e n\u00e3o ter medo do fracasso. Espero que a minha experi\u00eancia vos possa ajudar.<\/p>","protected":false},"excerpt":{"rendered":"

Compreender as marcas de queimadura na moldagem por inje\u00e7\u00e3o, identificar as suas causas, encontrar solu\u00e7\u00f5es e domin\u00e1-las atrav\u00e9s de um simples estudo de caso.<\/p>","protected":false},"author":5,"featured_media":19419,"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-19415","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tips","tag-injection-molding","tag-injection-molding-defects"],"acf":[],"yoast_head":"\nBurn Marks In Injection Molding<\/title>\n<meta name=\"description\" content=\"Understand burn marks in injection molding, identify their causes, find solutions, and master them through a simple case study.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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