{"id":19529,"date":"2024-05-11T08:43:06","date_gmt":"2024-05-11T00:43:06","guid":{"rendered":"https:\/\/firstmold.com\/?p=19529"},"modified":"2026-01-21T13:57:44","modified_gmt":"2026-01-21T05:57:44","slug":"bubbles","status":"publish","type":"post","link":"https:\/\/firstmold.com\/pt\/tips\/bubbles\/","title":{"rendered":"Bolhas Causas e Solu\u00e7\u00f5es | Defeitos de Moldagem por Inje\u00e7\u00e3o"},"content":{"rendered":"

Em moldagem por inje\u00e7\u00e3o<\/strong><\/a>As bolhas n\u00e3o s\u00e3o um fen\u00f3meno comum defeito de moldagem por inje\u00e7\u00e3o<\/strong><\/a> em geral, em pequenas oficinas. As bolhas ocorrem principalmente em produtos transparentes n\u00e3o grandes; os produtos transparentes pequenos n\u00e3o s\u00e3o propensos a bolhas, enquanto os produtos n\u00e3o transparentes normalmente n\u00e3o t\u00eam requisitos espec\u00edficos. Hoje, vamos centrar-nos nas bolhas na moldagem por inje\u00e7\u00e3o, continuando a nossa explora\u00e7\u00e3o dos defeitos de moldagem.<\/p>\n\n\n\n

Se quiser saber mais sobre outros defeitos de moldagem por inje\u00e7\u00e3o, clique na liga\u00e7\u00e3o 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><\/a><\/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><\/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 bolhas em produtos moldados por inje\u00e7\u00e3o?<\/h2>\n\n\n\n

As bolhas formam-se quando os gases na cavidade do molde ficam presos durante o fluxo do pl\u00e1stico fundido. Se estes gases n\u00e3o forem adequadamente ventilados, permanecem presos, formando bolhas ou resultando em espa\u00e7os vazios onde a cavidade n\u00e3o \u00e9 totalmente preenchida. Isto afecta o efeito de moldagem subsequente e a qualidade do produto.<\/p>\n\n\n\n

Para os t\u00e9cnicos, a resolu\u00e7\u00e3o de bolhas nos produtos exige muitas vezes mais do que a simples redu\u00e7\u00e3o da velocidade e da temperatura de fus\u00e3o. O ajuste de produtos transparentes \u00e9 um dos defeitos mais dif\u00edceis na moldagem por inje\u00e7\u00e3o.<\/p>\n\n\n\n

M\u00e9todos para distinguir entre bolhas e vazios de v\u00e1cuo:<\/h3>\n\n\n\n

As bolhas e os vazios de v\u00e1cuo s\u00e3o diferentes. Os vazios de v\u00e1cuo formam-se devido a um arrefecimento e contra\u00e7\u00e3o irregulares ap\u00f3s a conclus\u00e3o do processo de moldagem, muitas vezes devido a uma espessura de parede irregular. No interior, n\u00e3o existe efetivamente ar, apenas marcas de afundamento. As bolhas ocorrem normalmente nas linhas de soldadura ou no final do processo de enchimento devido ao excesso de gases no molde que n\u00e3o s\u00e3o ventilados durante o enchimento, particularmente em produtos maiores, resultando em bolhas grandes que produzem um som de estalo quando o produto \u00e9 partido.<\/p>\n\n\n\n

Em resumo, a maioria das bolhas est\u00e1 presente quando o molde abre. Se n\u00e3o existirem bolhas imediatamente ap\u00f3s a desmoldagem, mas aparecerem bolhas depois de o produto arrefecer durante algum tempo, trata-se de vazios de v\u00e1cuo (marcas de afundamento). Os vazios de v\u00e1cuo ocorrem frequentemente em sec\u00e7\u00f5es mais espessas, aparecendo normalmente de forma isolada. As bolhas aparecem nas extremidades dos produtos ou nas \u00e1reas de jun\u00e7\u00e3o, muitas vezes em m\u00faltiplos. Por conseguinte, compreender claramente o tipo de bolhas pode ajudar significativamente durante o processo de ajuste da m\u00e1quina.<\/p>\n\n\n\n

Causas de bolhas em produtos e solu\u00e7\u00f5es pl\u00e1sticas:<\/h2>\n\n\n\n

Incorpora\u00e7\u00e3o excessiva de ar durante o processo de plastifica\u00e7\u00e3o por parafuso.<\/h3>\n\n\n\n

An\u00e1lise de causas: <\/p>\n\n\n\n

Quando a taxa de alimenta\u00e7\u00e3o \u00e9 demasiado r\u00e1pida ou a contrapress\u00e3o \u00e9 demasiado baixa durante o processo de plastifica\u00e7\u00e3o por parafuso, o material entra prematuramente na sec\u00e7\u00e3o de plastifica\u00e7\u00e3o do cilindro, retendo ar em excesso. Durante a fase de dosagem, o ar mistura-se com a massa fundida e n\u00e3o pode ser expelido atrav\u00e9s das aberturas da porta e do bico. Durante o enchimento por inje\u00e7\u00e3o, tanto o g\u00e1s como a massa fundida s\u00e3o injectados na cavidade do molde, formando bolhas.<\/p>\n\n\n\n

Solu\u00e7\u00f5es: <\/p>\n\n\n\n

1. Reduzir a velocidade de rota\u00e7\u00e3o do parafuso. <\/p>\n\n\n\n

2. Aumentar a contrapress\u00e3o de acordo com as normas de processamento.<\/p>\n\n\n\n

Humidade excessiva na fus\u00e3o.<\/h3>\n\n\n\n

An\u00e1lise de causas:<\/em><\/strong><\/p>\n\n\n\n

1. Os materiais armazenados de forma incorrecta ou altamente higrosc\u00f3picos podem conter demasiada humidade. Se n\u00e3o forem suficientemente secos antes da moldagem, ocorre hidr\u00f3lise a alta temperatura no cilindro, aprisionando gases na massa fundida. <\/p>\n\n\n\n

2. Fraca estabilidade t\u00e9rmica do pl\u00e1stico, utiliza\u00e7\u00e3o de materiais reciclados de estrutura solta ou incorpora\u00e7\u00e3o de ar no interior das part\u00edculas do material. <\/p>\n\n\n\n

3. Utiliza\u00e7\u00e3o de materiais reciclados que excedam o r\u00e1cio normalizado do processo, geralmente n\u00e3o superior a 20% do r\u00e1cio da mat\u00e9ria-prima.<\/p>\n\n\n\n

Solu\u00e7\u00f5es:<\/em><\/strong><\/p>\n\n\n\n

1. Verificar se o sistema de secagem em tambor est\u00e1 a funcionar corretamente e secar bem os materiais de acordo com as normas de processamento. <\/p>\n\n\n\n

2. Reduzir adequadamente a temperatura do barril. <\/p>\n\n\n\n

3. Reduzir a velocidade de inje\u00e7\u00e3o<\/strong><\/a>.<\/p>\n\n\n\n

4. Aumentar a contrapress\u00e3o.<\/p>\n\n\n\n

Degrada\u00e7\u00e3o t\u00e9rmica do material<\/h3>\n\n\n\n

An\u00e1lise de causas:<\/em><\/strong><\/p>\n\n\n\n

1. Ajustes excessivamente elevados da temperatura do tambor (dispositivos de aquecimento n\u00e3o controlados) que levam \u00e0 degrada\u00e7\u00e3o t\u00e9rmica do material. <\/p>\n\n\n\n

2. A fus\u00e3o permanece demasiado tempo no tambor, resultando em degrada\u00e7\u00e3o t\u00e9rmica. <\/p>\n\n\n\n

3. Calor de cisalhamento excessivo devido a velocidades de inje\u00e7\u00e3o demasiado r\u00e1pidas durante o enchimento da inje\u00e7\u00e3o, ocorrendo normalmente perto da porta.<\/p>\n\n\n\n

4. A contrapress\u00e3o excessiva provoca calor por fric\u00e7\u00e3o durante a rota\u00e7\u00e3o do parafuso, levando \u00e0 degrada\u00e7\u00e3o t\u00e9rmica.<\/p>\n\n\n\n

Solu\u00e7\u00f5es:<\/em><\/strong><\/p>\n\n\n\n

1. Reduzir adequadamente a temperatura do tambor. <\/p>\n\n\n\n

2. Minimizar as paragens n\u00e3o planeadas e encurtar o tempo do ciclo de moldagem. Geralmente, a massa fundida n\u00e3o deve permanecer no cilindro por mais de cinco minutos. O cilindro deve ser esvaziado antes de retomar a inje\u00e7\u00e3o.<\/p>\n\n\n\n

3. Reajustar os par\u00e2metros do processo, reduzindo a velocidade e a press\u00e3o de inje\u00e7\u00e3o. <\/p>\n\n\n\n

4. Reduzir a contrapress\u00e3o.<\/p>\n\n\n\n

M\u00e1 ventila\u00e7\u00e3o do bolor<\/h3>\n\n\n\n

An\u00e1lise de causas:<\/em><\/strong><\/p>\n\n\n\n

1. Ventila\u00e7\u00e3o incompleta do molde, falta das ranhuras de ventila\u00e7\u00e3o necess\u00e1rias no linha de separa\u00e7\u00e3o<\/strong><\/a>ou canais de ventila\u00e7\u00e3o bloqueados e deformados. As sec\u00e7\u00f5es profundas do produto n\u00e3o t\u00eam a necess\u00e1ria inser\u00e7\u00f5es de molde<\/strong><\/a> e os pinos de ventila\u00e7\u00e3o, fazendo com que a massa fundida se acumule e n\u00e3o seja ventilada durante o enchimento.<\/p>\n\n\n\n

2. Forma\u00e7\u00e3o de bolhas no final do enchimento, nomeadamente nos cantos (por exemplo, nos cursores). <\/p>\n\n\n\n

3. Tipo de ventila\u00e7\u00e3o de g\u00e1s corredores quentes<\/strong><\/a>, A temperatura excessiva do canal quente provoca a decomposi\u00e7\u00e3o t\u00e9rmica e a forma\u00e7\u00e3o de bolhas.<\/p>\n\n\n\n

4. Mau acabamento da superf\u00edcie do molde, criando uma elevada fric\u00e7\u00e3o durante o enchimento da massa fundida, levando \u00e0 decomposi\u00e7\u00e3o t\u00e9rmica do material. <\/p>\n\n\n\n

5. Localiza\u00e7\u00e3o inadequada do port\u00e3o ou tamanho do port\u00e3o demasiado pequeno, causando bolhas de g\u00e1s presas localmente devido a uma ventila\u00e7\u00e3o deficiente do molde.<\/p>\n\n\n\n

Solu\u00e7\u00f5es:<\/em><\/strong><\/p>\n\n\n\n

1. Com base na localiza\u00e7\u00e3o das bolhas, adicione ou aumente as ranhuras de ventila\u00e7\u00e3o para melhorar a ventila\u00e7\u00e3o do molde. <\/p>\n\n\n\n

2. Melhorar a estrutura do molde, evitar \u00e2ngulos agudos e adotar m\u00e9todos de inje\u00e7\u00e3o em v\u00e1rias fases para controlar a press\u00e3o e a velocidade de inje\u00e7\u00e3o em sec\u00e7\u00f5es, reduzindo a press\u00e3o e a velocidade em \u00e1reas propensas a bolhas. <\/p>\n\n\n\n

3. Reduzir a temperatura das bobinas de aquecimento do canal quente, aumentar a contrapress\u00e3o para reduzir a quantidade de g\u00e1s aspirado para o tambor e aumentar o volume de enchimento.<\/p>\n\n\n\n

Condi\u00e7\u00f5es inadequadas de moldagem por inje\u00e7\u00e3o.<\/h3>\n\n\n\n

An\u00e1lise de causas:<\/em><\/strong><\/p>\n\n\n\n

1. A velocidade de moldagem por inje\u00e7\u00e3o \u00e9 demasiado r\u00e1pida, impedindo a ventila\u00e7\u00e3o atempada dos gases no molde e prendendo-os no pl\u00e1stico fundido, resultando em bolhas de g\u00e1s presas.<\/p>\n\n\n\n

2. Temperatura excessiva do cilindro, aumentando a fluidez do material para al\u00e9m das suas propriedades reais de fluidez. <\/p>\n\n\n\n

3. Excessiva contrapress\u00e3o, que aumenta a temperatura da massa fundida, melhorando assim a sua fluidez. <\/p>\n\n\n\n

4. Press\u00e3o de aperto excessiva, bloqueando o molde com demasiada for\u00e7a, causando acumula\u00e7\u00e3o de g\u00e1s e incapacidade de ventila\u00e7\u00e3o.<\/p>\n\n\n\n

Solu\u00e7\u00f5es:<\/em><\/strong><\/p>\n\n\n\n

1. Aumentar a profundidade de ventila\u00e7\u00e3o e adotar a inje\u00e7\u00e3o em v\u00e1rias fases, reduzindo a press\u00e3o e a velocidade de inje\u00e7\u00e3o nas zonas de forma\u00e7\u00e3o de bolhas. <\/p>\n\n\n\n

2. Definir a temperatura de acordo com as normas de processamento do material e, se necess\u00e1rio, detetar a temperatura real de fus\u00e3o, para reduzir o potencial de decomposi\u00e7\u00e3o t\u00e9rmica da fus\u00e3o. <\/p>\n\n\n\n

3. Uma contrapress\u00e3o excessiva pode causar a degrada\u00e7\u00e3o t\u00e9rmica da massa fundida e a forma\u00e7\u00e3o de bolhas, enquanto uma contrapress\u00e3o demasiado baixa pode tamb\u00e9m levar \u00e0 forma\u00e7\u00e3o de bolhas devido \u00e0 incorpora\u00e7\u00e3o de ar. Definir o valor da contrapress\u00e3o de acordo com as normas de processamento do material. <\/p>\n\n\n\n

4. A redu\u00e7\u00e3o da press\u00e3o de aperto pode resolver significativamente os problemas de aprisionamento de g\u00e1s no molde, mas tamb\u00e9m pode levar a outros defeitos de processamento, como queimaduras e flash.<\/p>\n\n\n\n

Conclus\u00e3o<\/h2>\n\n\n\n

As bolhas s\u00e3o um defeito \u00fanico nos produtos moldados por inje\u00e7\u00e3o transparentes. Uma vez que muitos materiais pl\u00e1sticos podem existir numa forma transparente, os problemas de bolhas tamb\u00e9m s\u00e3o comuns em f\u00e1bricas de moldagem por inje\u00e7\u00e3o<\/strong><\/a>. Se tiver algum caso relacionado com bolhas de moldagem por inje\u00e7\u00e3o para partilhar, contacte-me atrav\u00e9s do meu e-mail: firstmold88@gmail.com<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Explore as causas das bolhas nas pe\u00e7as moldadas por inje\u00e7\u00e3o de pl\u00e1stico transparente e as solu\u00e7\u00f5es para obter produtos transparentes de alta qualidade.<\/p>","protected":false},"author":5,"featured_media":19532,"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-19529","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tips","tag-injection-molding","tag-injection-molding-defects"],"acf":[],"yoast_head":"\nBubbles In Injection Molded Parts | Causes And Solutions<\/title>\n<meta name=\"description\" content=\"Explore the causes of bubbles in transparent plastic injection molded oparts and solutions to obtain high-quality clear products.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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