{"id":9327,"date":"2026-01-16T17:23:51","date_gmt":"2026-01-16T16:23:51","guid":{"rendered":"https:\/\/www.recyclemachine.net\/?p=9327"},"modified":"2026-01-16T09:23:52","modified_gmt":"2026-01-16T08:23:52","slug":"guide-de-recyclage-des-extrudeuses-a-vis-unique-et-a-double-vis","status":"publish","type":"post","link":"https:\/\/www.energycle.com\/fr\/guide-de-recyclage-des-extrudeuses-a-vis-unique-et-a-double-vis\/","title":{"rendered":"Extrudeuses \u00e0 vis unique ou \u00e0 double vis pour le recyclage\u00a0: comment choisir\u00a0?"},"content":{"rendered":"<p>If you\u2019re building a recycling pelletizing line, you\u2019ll eventually face a key decision: single-screw or twin-screw extrusion. Both are proven technologies, but they solve different problems.<\/p>\n<p>In many recycling projects, single-screw systems are chosen because they can build steady melt pressure for filtration and pelletizing with a simpler mechanical layout. Twin-screw systems are often chosen when mixing and dispersion define pellet quality, or when the process is closer to compounding than recycling.<\/p>\n<p>This guide explains the trade-offs in practical terms so you can choose based on your feedstock and your customer\u2019s acceptance tests.<\/p>\n<h2>Quick Takeaways<\/h2>\n<ul>\n<li>Single-screw extruders are often chosen for stable melt pressure, filtration, and pelletizing.<\/li>\n<li>Twin-screw extruders are often chosen when mixing and dispersion drive product performance.<\/li>\n<li>Start from the output spec (contamination window, additives, MFR\/IV target), then select the extruder type.<\/li>\n<\/ul>\n<h2>How a Single-Screw Recycling Pelletizer Works (High Level)<\/h2>\n<p>In a typical recycling pelletizer, the screw has functional zones: &#8211; a <strong>feed\/conveying zone<\/strong> to accept regrind or densified feedstock &#8211; a <strong>melting\/compression zone<\/strong> where solids transition into melt (heat + shear) &#8211; a <strong>metering zone<\/strong> that stabilizes output and builds pressure for filtration and die flow<\/p>\n<p>Most recycling projects package these functions with: &#8211; stable feeding (especially for film) &#8211; melt filtration (<a href=\"https:\/\/www.energycle.com\/recycling-machine-accessories\/screen-changer\/\">screen changer<\/a>) &#8211; degassing as needed &#8211; pelletizing system matched to the polymer and end market<\/p>\n<p>For typical line configurations and options, see Energycle\u2019s <a href=\"https:\/\/www.energycle.com\/plastic-pelletizers\/\">plastic pelletizer machines<\/a>.<\/p>\n<h2>Single-Screw vs Twin-Screw: The Buyer Comparison Table<\/h2>\n<table>\n  <thead>\n    <tr>\n      <th>Decision factor<\/th>\n      <th>Single-screw tends to fit when\u2026<\/th>\n      <th>Twin-screw tends to fit when\u2026<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>Main job<\/td>\n      <td>Melt + build pressure + filter + pelletize<\/td>\n      <td>Mix\/compound + disperse additives + controlled devolatilization<\/td>\n    <\/tr>\n    <tr>\n      <td>Melt pressure stability<\/td>\n      <td>You need steady pressure for filtration and consistent pellet size<\/td>\n      <td>You can justify more complex screw elements and controls to reach the mixing target<\/td>\n    <\/tr>\n    <tr>\n      <td>Mixing requirement<\/td>\n      <td>You mainly need homogenization (regrind + virgin, small additive package)<\/td>\n      <td>You need stronger dispersive\/distributive mixing for dispersion-sensitive products<\/td>\n    <\/tr>\n    <tr>\n      <td>Feedstock variability<\/td>\n      <td>You can keep moisture and contamination tighter<\/td>\n      <td>You need more processing headroom for variability and mixing demands<\/td>\n    <\/tr>\n    <tr>\n      <td>Maintenance model<\/td>\n      <td>You want simpler mechanical service routines<\/td>\n      <td>You accept higher mechanical complexity for the processing capability<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<h2>Why Single-Screw Is Common in Recycling Lines<\/h2>\n<h3>1) It builds stable pressure for filtration and pelletizing<\/h3>\n<p>Recycling melt often carries fine contamination (paper fibers, fines, aluminum specks, degraded polymer). Filtration and pelletizing need stable melt pressure and predictable flow. If pressure swings, you typically see more screen-change downtime, more restart scrap, and wider pellet size variation.<\/p>\n<h3>2) It keeps the mechanical layout simpler<\/h3>\n<p>Single-screw systems are mechanically simpler than most twin-screw compounding lines. That can matter if you want predictable wear-part management and faster service routines\u2014especially in plants that run a lean maintenance team.<\/p>\n<h3>3) It works well when the line stabilizes feedstock upstream<\/h3>\n<p>Many recycling lines stabilize feedstock before the extruder (densification for film, washing\/drying, metal removal) so the screw sees a steadier feed. That can make a single-screw line perform well without paying for compounding-level mixing capability.<\/p>\n<h2>Where Twin-Screw Makes Sense<\/h2>\n<p>Twin-screw extrusion is commonly considered when mixing and dispersion define success, such as: &#8211; compounding with fillers, reinforcements, or larger additive packages &#8211; blending polymers where dispersion quality drives mechanical properties &#8211; processes that need more complex screw element layouts for controlled mixing behavior<\/p>\n<p>Plastics Technology explains why twin-screw mixing behaves differently: intermeshing screws can transfer polymer between screws multiple times for full-channel mixing, which can support more complete mixing without the same output loss and melt-temperature penalty that high-shear mixing sections can create in single-screw designs. (Source: <a href=\"https:\/\/www.ptonline.com\/articles\/single-vs-twin-screw-extruders-why-mixing-is-different\">Plastics Technology \u2014 Twin-screw mixing differences<\/a>)<\/p>\n<h2>How Extruder Choice Affects Filtration and Pelletizing<\/h2>\n<p>Pelletizing is downstream, but extruder choice changes the operating window. Underwater pelletizing systems, for example, depend on coordinated specification of extruders, pumps, filters, water systems, and dryers. Plastics Technology notes that the underwater pelletizer only performs well when those systems are specified together to achieve consistent pellet quality. (Source: <a href=\"https:\/\/www.ptonline.com\/articles\/the-path-to-pellet-perfection\">Plastics Technology \u2014 The Path to Pellet Perfection<\/a>)<\/p>\n<p>For a practical overview of pelletizing methods and what they require from the melt, see Energycle\u2019s <a href=\"https:\/\/www.energycle.com\/pelletizing-methods-in-plastic-pelletizer-a-comprehensive-guide\/\">pelletizing methods guide<\/a>.<\/p>\n<h2>What to Ask Suppliers (So You Don\u2019t Buy Assumptions)<\/h2>\n<p>Use these questions to force \u201capples-to-apples\u201d quotes:<\/p>\n<p>1) What is the target polymer and end market (film, injection, sheet, strapping, fiber)?<br \/>\n2) How variable is the input quality (moisture, paper\/labels, fines, other polymers)?<br \/>\n3) Do you need mixing\/compounding, or mainly melt + filter + pelletize?<br \/>\n4) What QC property defines success (MFR, contamination count, color, odor, IV for PET)?<br \/>\n5) What melt pressure range and fluctuation do you expect at the target throughput?<br \/>\n6) What screen-change interval and restart scrap should we expect at our contamination level?<br \/>\n7) What service model do you assume (in-house maintenance vs supplier service), and what are the rebuild intervals?<\/p>\n<p>If you want Energycle to recommend a line concept and supporting modules, use the <a href=\"https:\/\/www.energycle.com\/contact-us\/\">contact form<\/a>.<\/p>\n<h2>FAQ (Real Procurement Questions)<\/h2>\n<h3>If I\u2019m mainly filtering and pelletizing, is twin-screw overkill?<\/h3>\n<p>Sometimes. If your success metric is stable melt pressure through filtration and consistent pellet size, a well-specified single-screw line can be the more practical choice. Twin-screw systems add value when you need mixing intensity or dispersion quality that changes pellet properties, but that capability comes with cost and mechanical complexity. A better way to decide is to define what \u201cbad pellets\u201d look like for your customer\u2014gels, specks, odor, MFR drift, IV loss for PET\u2014then map each failure mode to a process need (mixing, drying, degassing, filtration). If mixing is not your limiting factor, prioritize feeding stability and filtration strategy instead.<\/p>\n<h3>What\u2019s the clearest sign I actually need twin-screw mixing?<\/h3>\n<p>You need to add or disperse a meaningful package of additives or fillers and the pellet quality depends on dispersion. Plastics Technology notes that intensive mixing with high shear is required to fully disperse additives or other polymers, and explains that twin-screw designs can transfer polymer between screws multiple times for full-channel mixing. If your customer tests show that poor dispersion causes failures (strength loss, inconsistent MFR, visible defects), a twin-screw process becomes easier to justify. If your issues are mainly contamination and pressure instability, focus on feeding, drying, and filtration first. (Source: <a href=\"https:\/\/www.ptonline.com\/articles\/single-vs-twin-screw-extruders-why-mixing-is-different\">Plastics Technology \u2014 Twin-screw mixing differences<\/a>)<\/p>\n<h3>Can single-screw still handle odor and volatile removal in recycling?<\/h3>\n<p>Yes, but you need to specify the degassing concept correctly. If your feedstock carries moisture or volatiles (inks, residual organics), venting and vacuum system selection matter. Confirm how the design prevents melt carryover into the vacuum line and how maintenance is handled when deposits form. For PET, a vacuum supplier\u2019s extruder degassing overview describes that PET degassing can extract vapors such as water, solvents, monomers\/oligomers, plus entrained particles into the vacuum system, which explains why traps and maintenance planning matter in real plants. (Source: <a href=\"https:\/\/www.leybold.com\/en\/products\/systems-and-solutions\/customized-vacuum-systems\/extruder-degassing\">Leybold extruder degassing overview<\/a>)<\/p>\n<h3>How should I compare single-screw and twin-screw quotes without getting lost in specs?<\/h3>\n<p>Force both suppliers to quote the same outcome: saleable pellets per hour at a defined feedstock condition. Provide moisture and contamination ranges, target pellet spec, and the acceptance tests your buyers use. Then ask each supplier to list the modules that make that outcome possible: feeding\/conditioning, degassing, filtration type and screen area, and pelletizing method. A quote that does not include a filtration plan (expected screen-change interval, pressure trend expectations, restart scrap) is not comparable. Treat screw L\/D ratios and motor kW as secondary. Outcome definition is what prevents surprises after commissioning.<\/p>\n<h3>If I plan to use underwater pelletizing, what should I demand in the proposal?<\/h3>\n<p>Demand a coordinated system proposal, not an \u201cunderwater pelletizer price.\u201d Plastics Technology notes that underwater pelletizing success depends on properly specified extruders, pumps, filters, water systems, and dryers working together. Ask for the water system and dryer specs, expected pellet fines level, and how pellet size is controlled as cutters and dies wear. Also require melt pressure and temperature trend targets at your throughput. If the supplier can\u2019t show how filtration and melt pressure stability support the pelletizer, you\u2019ll likely fight pellet quality issues and fines after startup. (Source: <a href=\"https:\/\/www.ptonline.com\/articles\/the-path-to-pellet-perfection\">Plastics Technology \u2014 The Path to Pellet Perfection<\/a>)<\/p>\n<h2>References<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.iso.org\/standard\/15270.html\">ISO \u2014 Plastics recycling guideline (ISO 15270 overview)<\/a><\/li>\n<li><a href=\"https:\/\/store.astm.org\/d1238-23.html\">ASTM \u2014 Melt flow rate test method (ASTM D1238 overview)<\/a><\/li>\n<li><a href=\"https:\/\/www.ptonline.com\/articles\/single-vs-twin-screw-extruders-why-mixing-is-different\">Plastics Technology \u2014 Why mixing differs in twin-screw vs single-screw<\/a><\/li>\n<li><a href=\"https:\/\/www.ptonline.com\/articles\/the-path-to-pellet-perfection\">Plastics Technology \u2014 Underwater pelletizing system specification considerations<\/a><\/li>\n<li><a href=\"https:\/\/www.leybold.com\/en\/products\/systems-and-solutions\/customized-vacuum-systems\/extruder-degassing\">Leybold \u2014 Extruder degassing overview<\/a><\/li>\n<li><a href=\"https:\/\/www.energycle.com\/plastic-pelletizers\/\">Energycle \u2014 Plastic pelletizer machines<\/a><\/li>\n<li><a href=\"https:\/\/www.energycle.com\/pelletizing-methods-in-plastic-pelletizer-a-comprehensive-guide\/\">Energycle \u2014 Pelletizing methods guide<\/a><\/li>\n<li><a href=\"https:\/\/www.energycle.com\/contact-us\/\">Energycle \u2014 Contact<\/a><\/li>\n<\/ul>\n\n\n<h2 class=\"wp-block-heading\">Related Resources<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.energycle.com\/pelletizing-extrusion\/plastic-pelletizers\/\">Plastic pelletizers<\/a><\/li>\n<li><a href=\"https:\/\/www.energycle.com\/single-screw-plastic-pelletizing-machine\/\">Single-screw pelletizer<\/a><\/li>\n<li><a href=\"https:\/\/www.energycle.com\/twin-screw-plastic-extruder\/\">Twin-screw extruder<\/a><\/li>\n<\/ul>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Should I choose a single-screw or twin-screw extruder for recycling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Single-screw extruders are simpler, cheaper, and ideal for clean, single-resin materials like pre-washed PET or HDPE flakes. Twin-screw extruders offer better mixing, degassing, and handle contaminated or mixed materials but cost 40-60% more. For most standard plastic recycling applications, single-screw provides the best value.\"\n      }\n    }\n  ]\n}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Si vous construisez une ligne de granulation de recyclage, vous devrez finalement prendre une d\u00e9cision cl\u00e9 : extrusion \u00e0 vis unique ou \u00e0 vis double. Les deux sont des technologies \u00e9prouv\u00e9es, mais elles r\u00e9solvent des probl\u00e8mes diff\u00e9rents. Dans de nombreux projets de recyclage, les syst\u00e8mes \u00e0 vis unique sont souvent choisis car ils peuvent construire une pression de fusion constante pour la filtration et la granulation avec un agencement m\u00e9canique plus simple. Les syst\u00e8mes \u00e0 vis double sont souvent choisis \u2026 <a href=\"https:\/\/www.energycle.com\/fr\/guide-de-recyclage-des-extrudeuses-a-vis-unique-et-a-double-vis\/\" class=\"more-link\">Continuer \u00e0 lire <span class=\"screen-reader-text\">Extrudeuses \u00e0 vis unique ou \u00e0 double vis pour le recyclage\u00a0: comment choisir\u00a0?<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3062],"tags":[],"class_list":["post-9327","post","type-post","status-publish","format-standard","hentry","category-buying-guides"],"tsf_seo":{"title":"Explication des machines de granulation de plastique \u00e0 vis unique - Machines de recyclage de plastique","description":"D\u00e9couvrez nos machines de granulation de plastique monovis de pointe, con\u00e7ues pour un recyclage efficace du plastique. Dot\u00e9es de la technologie Heat Wave Stabilization\u2122, d&#039;un syst\u00e8me de changement de tamis hydraulique et d&#039;options personnalisables pour la granulation par fusion ou par filaments, ces machines produisent des granul\u00e9s de haute qualit\u00e9 avec une automatisation accrue.","robots":"index, follow","canonical":"https:\/\/www.energycle.com\/fr\/guide-de-recyclage-des-extrudeuses-a-vis-unique-et-a-double-vis\/","og_title":"Single-Screw Plastic Pelletizing Machines Explained - Plastic Recycling Machines","og_description":"Discover our advanced single-screw plastic pelletizing machines designed for efficient plastic recycling. Featuring Heat Wave Stabilization\u2122, hydraulic screen change, and customizable options for melt or strand pelletizing, these machines deliver high-quality pellets with improved automation.","og_image":""},"_links":{"self":[{"href":"https:\/\/www.energycle.com\/fr\/wp-json\/wp\/v2\/posts\/9327","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.energycle.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.energycle.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.energycle.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.energycle.com\/fr\/wp-json\/wp\/v2\/comments?post=9327"}],"version-history":[{"count":0,"href":"https:\/\/www.energycle.com\/fr\/wp-json\/wp\/v2\/posts\/9327\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.energycle.com\/fr\/wp-json\/wp\/v2\/media?parent=9327"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.energycle.com\/fr\/wp-json\/wp\/v2\/categories?post=9327"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.energycle.com\/fr\/wp-json\/wp\/v2\/tags?post=9327"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}