{"id":10078,"date":"2026-10-30T02:57:43","date_gmt":"2026-10-30T02:57:43","guid":{"rendered":"https:\/\/tz-machinery.com\/?p=10078"},"modified":"2026-10-30T03:03:46","modified_gmt":"2026-10-30T03:03:46","slug":"pet-co-rotating-twin-screw-extrusion-technology","status":"publish","type":"post","link":"https:\/\/tz-machinery.com\/de\/pet-co-rotating-twin-screw-extrusion-technology\/","title":{"rendered":"PET-Extrusionstechnologie mit gleichlaufenden Doppelschnecken: Elemente, Prozessschritte und Abbaukontrolle"},"content":{"rendered":"<p>PET is one of the most moisture- and heat-sensitive packaging polymers on the market, so the extruder you choose directly determines intrinsic viscosity (IV), colour and final sheet toughness. A PET co-rotating twin-screw extruder gives processors a modular, controllable way to convey, melt, mix, degas and discharge PET \u2014 but only when the screw configuration matches the material. This guide explains how the technology works, what each screw element does, where degradation risk comes from and how TZ-machinery applies an 85 mm parallel co-rotating twin-screw system in industrial PET sheet extrusion lines.<\/p>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">What Is a PET Co-Rotating Twin-Screw Extruder?<\/h2>\n<p>A twin-screw extruder uses two parallel screws inside one barrel. In a <strong>co-rotating<\/strong> design, both screws rotate in the same direction, and their flights <strong>intermesh<\/strong> closely to convey and work the melt. The screws are built from modular elements, so the process section can be arranged to suit the required application \u2014 devolatilization, compounding, or direct PET sheet extrusion.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/tz-machinery.com\/wp-content\/uploads\/2026\/10\/co-rotating-intermeshing-twin-screw-schematic.png\" alt=\"Co-rotating intermeshing twin-screw pair schematic for PET extrusion\" width=\"1600\" height=\"900\" \/><\/p>\n<p>Three characteristics define the design:<\/p>\n<ul>\n<li><strong>Co-rotating:<\/strong> both screws turn in the same direction, self-wiping the flight flanks.<\/li>\n<li><strong>Intermeshing:<\/strong> screw flights engage closely to convey and work the melt.<\/li>\n<li><strong>Modular design:<\/strong> screw elements can be rearranged to suit the required process.<\/li>\n<\/ul>\n<p>For a production-scale example, see the <a href=\"https:\/\/tz-machinery.com\/de\/maschine-fur-die-extrusion-von-kunststoffplatten-2\/extrusionsmaschine-fur-haustierplatten-mit-doppelschnecke\/\">Doppelschnecken-PET-Folien-Extrusionsmaschine<\/a> built around this 85 mm parallel co-rotating platform.<\/p>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">How PET Is Processed Inside the Extruder: Six Stages<\/h2>\n<p>Inside the barrel, PET passes through six functional stages:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/tz-machinery.com\/wp-content\/uploads\/2026\/10\/pet-twin-screw-six-processing-stages.png\" alt=\"Six processing stages inside a PET twin-screw extruder\" width=\"1600\" height=\"780\" \/><\/p>\n<ol>\n<li><strong>F\u00fctterung<\/strong> \u2014 PET flakes or pellets enter the barrel.<\/li>\n<li><strong>Conveying<\/strong> \u2014 material moves forward along the screws.<\/li>\n<li><strong>Melting<\/strong> \u2014 heat and mechanical energy soften the polymer.<\/li>\n<li><strong>Mixing<\/strong> \u2014 melt and additives become homogeneous.<\/li>\n<li><strong>Degassing<\/strong> \u2014 vacuum removes moisture and volatile components.<\/li>\n<li><strong>Discharge<\/strong> \u2014 the melt goes to filtration and the die.<\/li>\n<\/ol>\n<p>The actual sequence and performance depend on screw configuration, feedstock condition, temperature profile, vacuum system and throughput.<\/p>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">The Four Screw Element Types and What They Do<\/h2>\n<p>A PET twin-screw process section is assembled from four basic element families:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/tz-machinery.com\/wp-content\/uploads\/2026\/10\/twin-screw-element-types.png\" alt=\"Twin-screw element types: conveying, kneading, mixing and reverse elements\" width=\"1600\" height=\"940\" \/><\/p>\n<h3 style=\"font-size:16px;color:#000;font-weight:bold\">1. Conveying Elements \u2014 Forward Transport and Controlled Filling<\/h3>\n<p>Conveying elements move PET material forward along the barrel. They establish material transport, filling level and residence-time conditions. Pitch, element length, screw speed and feed rate all affect conveying capacity. Note that conveying elements provide transport rather than intensive mixing.<\/p>\n<h3 style=\"font-size:16px;color:#000;font-weight:bold\">2. Kneading Blocks \u2014 Dispersive and Distributive Mixing<\/h3>\n<p>Kneading blocks split, recombine and deform the material as it passes through staggered discs. Disc width, stagger angle, block length, screw speed and throughput define the mixing action. <strong>PET caution:<\/strong> excessive mechanical energy can increase melt temperature and degradation risk \u2014 stronger mixing is not always better for PET.<\/p>\n<h3 style=\"font-size:16px;color:#000;font-weight:bold\">3. Mixing Elements \u2014 Distribution and Formulation Uniformity<\/h3>\n<p>Mixing elements spread additives, colour masterbatch and different material components more evenly (distributive mixing) and break down agglomerates when sufficient stress is applied (dispersive mixing). Choose mixing intensity to achieve uniformity without unnecessary shear or heat.<\/p>\n<h3 style=\"font-size:16px;color:#000;font-weight:bold\">4. Reverse Conveying Elements \u2014 Controlled Restriction<\/h3>\n<p>Reverse elements oppose forward conveying locally and create a pressure-building section. Correctly positioned, they can increase melt filling, mixing and degassing effectiveness. The risk: they may increase residence time, shear and melt temperature, so they must be used carefully. Reverse elements are process-control elements \u2014 not simply &#8220;stronger mixing&#8221; elements.<\/p>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Vacuum Degassing: What It Can and Cannot Do<\/h2>\n<p>The vacuum port removes moisture and volatile components from the melt under suitable vacuum conditions. Effective degassing requires adequate melt surface renewal, sufficient vent area, proper vacuum capacity and stable operation.<\/p>\n<p><strong>Important limit:<\/strong> vacuum degassing does not guarantee that wet PET can be processed without drying. PET is moisture-sensitive at melt-processing temperatures, so feedstock moisture control remains critical. Vented single-screw lines such as the <a href=\"https:\/\/tz-machinery.com\/de\/maschine-fur-die-extrusion-von-kunststoffplatten-2\/swt-120d-pet-folien-extrusionsanlage\/\">SWT-120D vented single screw PET sheet extrusion line<\/a> follow the same principle \u2014 the vent system assists moisture and volatile removal, it does not replace correct drying.<\/p>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">How Screw Configuration Can Cause PET Degradation<\/h2>\n<p>Three mechanisms degrade PET during melt processing:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/tz-machinery.com\/wp-content\/uploads\/2026\/10\/pet-degradation-mechanisms.png\" alt=\"Three PET degradation mechanisms: hydrolytic, thermal and thermo-mechanical\" width=\"1600\" height=\"860\" \/><\/p>\n<ul>\n<li><strong>Hydrolytic degradation<\/strong> \u2014 moisture reacts with molten PET and breaks polymer chains, reducing intrinsic viscosity (IV) and molecular weight.<\/li>\n<li><strong>Thermal degradation<\/strong> \u2014 excessive melt temperature or long exposure at high temperature causes chain scission, discoloration and quality loss.<\/li>\n<li><strong>Thermo-mechanical degradation<\/strong> \u2014 excessive shear and mechanical energy raise melt temperature and contribute to polymer damage.<\/li>\n<\/ul>\n<p>Typical warning signs include IV or viscosity loss, yellowing, unstable melt pressure, and reduced toughness or forming performance. The screw elements do not automatically degrade PET \u2014 risk comes from the combined effects of moisture, temperature, shear, residence time and material condition.<\/p>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Balancing Mixing Performance and PET Protection<\/h2>\n<p>Screw design is a balancing act. Too little mixing produces poor additive dispersion, uneven material composition and incomplete homogenization. Too much mechanical energy produces higher melt temperature, longer residence time in restrictive zones and greater degradation risk.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/tz-machinery.com\/wp-content\/uploads\/2026\/10\/mixing-balance-pet-protection.png\" alt=\"Balancing mixing performance and PET protection in twin-screw extrusion\" width=\"1600\" height=\"760\" \/><\/p>\n<p>The optimized screw design matches conveying, kneading, mixing, reverse elements and degassing zones to the PET feedstock and target output \u2014 sufficient processing, not maximum shear.<\/p>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Six Practical Measures to Reduce PET Degradation<\/h2>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #999;padding:8px;color:#000\">#<\/th>\n<th style=\"border:1px solid #999;padding:8px;color:#000\">Measure<\/th>\n<th style=\"border:1px solid #999;padding:8px;color:#000\">What to Do<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">01<\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\"><strong>Dry and control feedstock<\/strong><\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">Keep PET moisture within the raw-material and process specification.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">02<\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\"><strong>Optimize melt temperature<\/strong><\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">Avoid unnecessary high temperatures and long hot residence times.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">03<\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\"><strong>Select screw elements carefully<\/strong><\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">Use only the mixing intensity needed for the target formulation.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">04<\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\"><strong>Avoid excessive restriction<\/strong><\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">Position reverse elements carefully and monitor pressure and temperature.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">05<\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\"><strong>Stabilize throughput<\/strong><\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">Avoid prolonged idling with PET melt inside the barrel.<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">06<\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\"><strong>Monitor melt quality<\/strong><\/td>\n<td style=\"border:1px solid #999;padding:8px;color:#000\">Track IV where applicable, colour, pressure, output and sheet performance.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Exact limits must be established from material supplier data, machine design and production trials.<\/p>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Application: 85 mm Twin-Screw + 75 mm Single-Screw ABA Line<\/h2>\n<p>The technology reaches full value in a hybrid ABA sheet line, where the twin-screw and single-screw systems work together:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/tz-machinery.com\/wp-content\/uploads\/2026\/10\/aba-pet-three-layer-line-layout.png\" alt=\"85 mm twin-screw plus 75 mm single-screw ABA PET three-layer line layout\" width=\"1600\" height=\"800\" \/><\/p>\n<ul>\n<li><strong>85 mm co-rotating twin-screw<\/strong> \u2014 B-layer processing: suitable recycled PET materials, mixing and vacuum degassing.<\/li>\n<li><strong>75 mm single-screw<\/strong> \u2014 A-layer processing: selected PET material for the outer surfaces (see the <a href=\"https:\/\/tz-machinery.com\/de\/maschine-fur-die-extrusion-von-kunststoffplatten-2\/extrusionsanlage-fur-pet-folien-mit-einer-schraube\/\">Produktionsanlage zur Extrusion von PET-Platten mit Einzelschnecke<\/a>).<\/li>\n<li><strong>ABA feedblock + T-die<\/strong> \u2014 combines the melt streams and forms the three-layer PET sheet.<\/li>\n<\/ul>\n<p>The result is an A\/B\/A structure: outer layers of selected virgin-quality PET around a core of recycled or alternative formulation. The full configuration is available in the <a href=\"https:\/\/tz-machinery.com\/de\/maschine-fur-die-extrusion-von-kunststoffplatten-2\/aba-pet-dreischicht-coextrusionsanlagen\/\">ABA PET-Dreischicht-Coextrusionsanlage<\/a>, which pairs both extrusion systems with a dedicated feedblock. Actual screw arrangement, layer allocation and processing window depend on the final machine design and the customer&#8217;s materials.<\/p>\n<h2 style=\"font-size:22px;color:#000;font-weight:bold\">Die wichtigsten Erkenntnisse<\/h2>\n<p>Design the screw. Control the process. Protect PET quality. Effective conveying, balanced mixing, controlled degassing and a correctly limited use of restrictive elements together deliver lower degradation risk \u2014 and that is what separates a stable PET sheet operation from a constant IV-loss troubleshooting exercise. Every screw configuration should be verified against the specific feedstock, target output and sheet quality requirements before committing to a production window.<\/p>","protected":false},"excerpt":{"rendered":"<p>TZ-machinery erl\u00e4utert die Funktionsweise eines gleichlaufenden PET-Doppelschneckenextruders \u2013 Schneckenelemente, sechs Verarbeitungsstufen, Vakuumentgasung und die Kontrolle des PET-Abbaus bei der Plattenextrusion.<\/p>","protected":false},"author":1,"featured_media":10079,"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":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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twin-screw extruder works: screw elements, process stages, vacuum degassing, degradation control and ABA line design by TZ-machinery.","_yoast_wpseo_title":"PET Co-Rotating Twin-Screw Extruder: Elements & Degradation"},"categories":[68],"tags":[],"class_list":["post-10078","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 v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PET Co-Rotating Twin-Screw Extruder: Elements &amp; Degradation<\/title>\n<meta name=\"description\" content=\"How a PET co-rotating twin-screw extruder works: screw elements, process stages, vacuum degassing, degradation control and ABA line design by TZ-machinery.\" \/>\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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