{"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":"moisture-control-pet-extrusion-hydrolysis","status":"publish","type":"post","link":"https:\/\/tz-machinery.com\/vi\/moisture-control-pet-extrusion-hydrolysis\/","title":{"rendered":"Moisture Control in PET Extrusion: How TZS-85PET Prevents Hydrolysis"},"content":{"rendered":"<h2 style=\"font-size:22px;color:#000;font-weight:bold\">The Science of Hydrolysis: Why PET is Moisture Sensitive<\/h2>\n<p>PET is hygroscopic, meaning it naturally absorbs water from the air. If PET resin or flakes are melted while they contain moisture, a chemical reaction called <strong>hydrolysis<\/strong> occurs.<\/p>\n<p>In simple terms, water molecules attack the polymer chains at high temperatures, breaking them into shorter pieces. This results in:<\/p>\n<ul>\n<li><strong>Loss of IV (Intrinsic Viscosity):<\/strong> The material becomes &#8220;watery&#8221; and loses strength.<\/li>\n<li><strong>Physical Defects:<\/strong> Bubbles, streaks, and &#8220;silver lines&#8221; appear on the sheet.<\/li>\n<li><strong>Brittleness:<\/strong> The finished product will crack easily during thermoforming.<\/li>\n<\/ul>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">How a PET Sheet Extrusion Line Handles Moisture<\/h2>\n<p>Modern extrusion lines, such as the TZS-85PET, use two primary methods to combat moisture: Pre-Drying or High-Vacuum Degassing.<\/p>\n<h3 style=\"font-size:16px;color:#000;font-weight:bold\">1. The Traditional Method: Desiccant Drying &amp; Crystallization<\/h3>\n<p>Before the plastic even reaches the extruder, it is fed into a Crystallization and Drying System.<\/p>\n<ul>\n<li><strong>Crystallization:<\/strong> Amorphous PET flakes are heated and stirred to prevent them from clumping together as they soften.<\/li>\n<li><strong>Desiccant Drying:<\/strong> Hot, dry air (with a dew point below -40\u00b0C) is circulated through the resin for several hours until moisture levels fall below 50 ppm (0.005%).<\/li>\n<\/ul>\n<h3 style=\"font-size:16px;color:#000;font-weight:bold\">2. The Modern Method: High-Vacuum Degassing (Twin-Screw Technology)<\/h3>\n<p>This is the energy-efficient technology that modern engineers favor. Instead of drying the material for hours before extrusion, the TZS-85PET Parallel Twin-Screw Extruder handles moisture during the melting process.<\/p>\n<ul>\n<li><strong>Venting Ports:<\/strong> The extruder barrel features multiple &#8220;venting&#8221; sections.<\/li>\n<li><strong>High-Vacuum Pumps:<\/strong> As the twin screws shear and melt the PET, specialized vacuum pumps pull a powerful vacuum (often less than 10 mbar) over the molten plastic.<\/li>\n<li><strong>Instant Removal:<\/strong> Water vapor and volatiles are sucked out of the melt before they have the chance to cause significant hydrolysis. This process &#8220;rejuvenates&#8221; the polymer in real-time.<\/li>\n<\/ul>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Why Choose TZ Machinery for PET Extrusion?<\/h2>\n<p>When engineers ask, <em>&#8220;What is the best way to extrude rPET?&#8221;<\/em>, here is how the TZS-85PET vacuum degassing compares to traditional pre-drying systems:<\/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\">Feature<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;text-align:left;font-weight:bold;color:#000\">Pre-Drying System<\/th>\n<th style=\"padding:10px;border:1px solid #ddd;text-align:left;font-weight:bold;color:#000\">TZS-85PET Vacuum Degassing<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd\">Energy Consumption<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">High (constant heating)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Low (direct processing)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd\">Floor Space<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Large (huge silos required)<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Compact (streamlined line)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd\">Material Flexibility<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Mostly Virgin PET<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">100% rPET Flakes \/ Scraps<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:10px;border:1px solid #ddd\">IV Retention<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Good<\/td>\n<td style=\"padding:10px;border:1px solid #ddd\">Excellent (via reactive extrusion)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Frequently Asked Questions<\/h2>\n<div style=\"background-color:#e3f2fd;padding:15px;border-radius:4px\">\n<p style=\"font-weight:bold;margin-bottom:8px;color:#000\">Q: Can you extrude PET without drying?<\/p>\n<p style=\"margin:0;color:#000\">A: Yes, by using a parallel twin-screw extruder equipped with a multi-stage high-vacuum degassing system. This technology, utilized in TZ Machinery&#8217;s TZS-85PET, removes moisture directly from the melt, eliminating the need for 4\u20136 hours of pre-drying.<\/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\">Q: How does moisture affect the quality of rPET sheets?<\/p>\n<p style=\"margin:0;color:#000\">A: Moisture causes hydrolysis during extrusion, which breaks down molecular chains. This leads to a drop in Intrinsic Viscosity (IV), resulting in clear sheets that are brittle, yellowish, or prone to cracking when formed into trays or containers.<\/p>\n<\/div>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Conclusion for 2026 Manufacturers<\/h2>\n<p>With regulations like Brazil&#8217;s Decree No. 12,688\/2025 mandating higher recycled content, your extrusion line must be &#8220;moisture-smart.&#8221; By switching to a TZS-85PET Parallel Twin Screw line, you reduce energy costs, save space, and ensure that even 100% recycled flakes produce a high-clarity, high-strength PET sheet.<\/p>\n<p>For more technical specifications on moisture control in extrusion, visit the <a href=\"https:\/\/tz-machinery.com\/vi\/plastic-sheet-extrusion-line-machine\/\">TZ Machinery product gallery<\/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 v27.9 - 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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