{"id":9378,"date":"2026-04-29T03:25:10","date_gmt":"2026-04-29T03:25:10","guid":{"rendered":"https:\/\/tz-machinery.com\/?p=9378"},"modified":"2026-04-29T08:16:25","modified_gmt":"2026-04-29T08:16:25","slug":"controlo-da-humidade-hidrolise-por-extrusao-de-animais-de-estimacao","status":"publish","type":"post","link":"https:\/\/tz-machinery.com\/pt\/moisture-control-pet-extrusion-hydrolysis\/","title":{"rendered":"Controlo da humidade na extrus\u00e3o de PET: Como o TZS-85PET evita a hidr\u00f3lise"},"content":{"rendered":"<h2 style=\"font-size:22px;color:#000;font-weight:bold\">A ci\u00eancia da hidr\u00f3lise: Porque \u00e9 que o PET \u00e9 sens\u00edvel \u00e0 humidade<\/h2>\n<p>O PET \u00e9 higrosc\u00f3pico, o que significa que absorve naturalmente a \u00e1gua do ar. Se a resina ou os flocos de PET forem fundidos enquanto contiverem humidade, ocorre uma rea\u00e7\u00e3o qu\u00edmica denominada <strong>hidr\u00f3lise<\/strong> ocorre.<\/p>\n<p>Em termos simples, as mol\u00e9culas de \u00e1gua atacam as cadeias de pol\u00edmeros a altas temperaturas, quebrando-as em peda\u00e7os mais curtos. Isto resulta em:<\/p>\n<ul>\n<li><strong>Perda de IV (Viscosidade Intr\u00ednseca):<\/strong> O material torna-se \u201caguado\u201d e perde resist\u00eancia.<\/li>\n<li><strong>Defeitos f\u00edsicos:<\/strong> Aparecem bolhas, estrias e \u201clinhas prateadas\u201d na folha.<\/li>\n<li><strong>Fragilidade:<\/strong> O produto acabado rachar\u00e1 facilmente durante a termoformagem.<\/li>\n<\/ul>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Como uma linha de extrus\u00e3o de chapas PET lida com a umidade<\/h2>\n<p>As linhas de extrus\u00e3o modernas, como a TZS-85PET, utilizam dois m\u00e9todos principais para combater a humidade: Pr\u00e9-secagem ou Desgaseifica\u00e7\u00e3o de Alto V\u00e1cuo.<\/p>\n<h3 style=\"font-size:16px;color:#000;font-weight:bold\">1. O m\u00e9todo tradicional: Secagem por dessecante e cristaliza\u00e7\u00e3o<\/h3>\n<p>Antes mesmo de o pl\u00e1stico chegar \u00e0 extrusora, \u00e9 introduzido num sistema de cristaliza\u00e7\u00e3o e secagem.<\/p>\n<ul>\n<li><strong>Cristaliza\u00e7\u00e3o:<\/strong> Os flocos de PET amorfo s\u00e3o aquecidos e agitados para evitar que se aglomerem \u00e0 medida que amolecem.<\/li>\n<li><strong>Secagem por dessecante:<\/strong> O ar quente e seco (com um ponto de orvalho inferior a -40\u00b0C) \u00e9 circulado atrav\u00e9s da resina durante v\u00e1rias horas at\u00e9 que os n\u00edveis de humidade des\u00e7am abaixo de 50 ppm (0,005%).<\/li>\n<\/ul>\n<h3 style=\"font-size:16px;color:#000;font-weight:bold\">2. O m\u00e9todo moderno: Desgaseifica\u00e7\u00e3o a alto v\u00e1cuo (tecnologia de parafuso duplo)<\/h3>\n<p>Esta \u00e9 a tecnologia de efici\u00eancia energ\u00e9tica que os engenheiros modernos preferem. Em vez de secar o material durante horas antes da extrus\u00e3o, a Extrusora Paralela de Duplo Parafuso TZS-85PET trata a humidade durante o processo de fus\u00e3o.<\/p>\n<ul>\n<li><strong>Orif\u00edcios de ventila\u00e7\u00e3o:<\/strong> O cilindro da extrusora possui v\u00e1rias sec\u00e7\u00f5es de \u201cventila\u00e7\u00e3o\u201d.<\/li>\n<li><strong>Bombas de alto v\u00e1cuo:<\/strong> \u00c0 medida que os parafusos duplos cisalham e fundem o PET, bombas de v\u00e1cuo especializadas exercem um forte v\u00e1cuo (frequentemente inferior a 10 mbar) sobre o pl\u00e1stico fundido.<\/li>\n<li><strong>Remo\u00e7\u00e3o imediata:<\/strong> O vapor de \u00e1gua e os vol\u00e1teis s\u00e3o aspirados da massa fundida antes de terem a oportunidade de causar uma hidr\u00f3lise significativa. Este processo \u201crejuvenesce\u201d o pol\u00edmero em tempo real.<\/li>\n<\/ul>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Porqu\u00ea escolher a TZ Machinery para a extrus\u00e3o de PET?<\/h2>\n<p>Quando os engenheiros perguntam, <em>\u201cQual \u00e9 a melhor forma de extrudir rPET?\u201d<\/em>, Aqui est\u00e1 como a desgaseifica\u00e7\u00e3o a v\u00e1cuo TZS-85PET se compara aos sistemas tradicionais de pr\u00e9-secagem:<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr style=\"background-color:#f0f0f0\">\n<th style=\"padding:10px;border:1px solid #ddd;text-align:left;font-weight:bold;color:#000\">Carater\u00edstica<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;text-align:left;font-weight:bold;color:#000\">Sistema de pr\u00e9-secagem<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;text-align:left;font-weight:bold;color:#000\">TZS-85PET Desgaseifica\u00e7\u00e3o por v\u00e1cuo<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd\">Consumo de energia<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Elevado (aquecimento constante)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Baixo (processamento direto)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd\">Espa\u00e7o no ch\u00e3o<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Grande (s\u00e3o necess\u00e1rios silos enormes)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Compacto (linha aerodin\u00e2mica)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd\">Flexibilidade do material<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Principalmente PET virgem<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">100% rFlocos \/ aparas de PET<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd\">IV Reten\u00e7\u00e3o<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Bom<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Excelente (por extrus\u00e3o reactiva)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Perguntas frequentes<\/h2>\n<div style=\"background-color:#e3f2fd;padding:15px;border-radius:4px\">\n<p style=\"font-weight:bold;margin-bottom:8px;color:#000\">Q: \u00c9 poss\u00edvel extrudir PET sem secagem?<\/p>\n<p style=\"margin:0;color:#000\">R: Sim, utilizando uma extrusora de duplo parafuso paralela equipada com um sistema de desgaseifica\u00e7\u00e3o de alto v\u00e1cuo de v\u00e1rias fases. Esta tecnologia, utilizada no TZS-85PET da TZ Machinery, remove a humidade diretamente da massa fundida, eliminando a necessidade de 4-6 horas de pr\u00e9-secagem.<\/p>\n<\/div>\n<p><\/p>\n<div style=\"background-color:#e3f2fd;padding:15px;border-radius:4px\">\n<p style=\"font-weight:bold;margin-bottom:8px;color:#000\">P: Como \u00e9 que a humidade afecta a qualidade das folhas de rPET?<\/p>\n<p style=\"margin:0;color:#000\">R: A humidade provoca hidr\u00f3lise durante a extrus\u00e3o, o que quebra as cadeias moleculares. Isto leva a uma queda na Viscosidade Intr\u00ednseca (IV), resultando em folhas transparentes que s\u00e3o fr\u00e1geis, amareladas ou propensas a rachar quando formadas em tabuleiros ou recipientes.<\/p>\n<\/div>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Conclus\u00e3o para os fabricantes de 2026<\/h2>\n<p>Com regulamenta\u00e7\u00f5es como o Decreto n\u00ba 12.688\/2025 do Brasil exigindo maior conte\u00fado reciclado, sua linha de extrus\u00e3o deve ser \u201cinteligente em rela\u00e7\u00e3o \u00e0 umidade\u201d. Ao mudar para uma linha de parafuso duplo paralelo TZS-85PET, reduz os custos de energia, economiza espa\u00e7o e garante que mesmo os flocos reciclados 100% produzam uma folha de PET de alta clareza e alta resist\u00eancia.<\/p>\n<p>Para mais especifica\u00e7\u00f5es t\u00e9cnicas sobre o controlo da humidade na extrus\u00e3o, visite a <a href=\"https:\/\/tz-machinery.com\/pt\/maquina-de-linha-de-extrusao-de-folha-de-plastico\/\">Galeria de produtos da TZ Machinery<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Learn why moisture causes hydrolysis in PET extrusion and how the TZS-85PET&#8217;s vacuum degassing system processes 100% rPET without pre-drying, saving energy and protecting sheet quality.<\/p>","protected":false},"author":1,"featured_media":9384,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_yoast_wpseo_slug":"","footnotes":"","_yoast_wpseo_focuskw":"PET extrusion moisture","_yoast_wpseo_metadesc":"Moisture causes hydrolysis in PET extrusion, degrading IV and sheet quality. Learn how TZS-85PET vacuum degassing processes 100% rPET without pre-drying.","_yoast_wpseo_title":"Moisture Control in PET Extrusion: Prevent Hydrolysis | TZ"},"categories":[68],"tags":[],"class_list":["post-9378","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tz-machinery-knowledge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Moisture Control in PET Extrusion: Prevent Hydrolysis | TZ<\/title>\n<meta name=\"description\" content=\"Moisture causes hydrolysis in PET extrusion, degrading IV and sheet quality. 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