{"id":3499,"date":"2026-09-02T10:55:33","date_gmt":"2026-09-02T10:55:33","guid":{"rendered":"https:\/\/sivite-machinery.com\/?p=3499"},"modified":"2026-09-02T11:24:45","modified_gmt":"2026-09-02T11:24:45","slug":"rendement-dune-extrudeuse-a-vis-unique-par-rapport-a-une-extrudeuse-a-double-vis-pour-la-fabrication-de-feuilles-de-pet","status":"publish","type":"post","link":"https:\/\/sivite-machinery.com\/fr\/single-screw-vs-twin-screw-pet-sheet-extruder-output\/","title":{"rendered":"Rendement des extrudeuses de feuilles de PET \u00e0 vis unique par rapport \u00e0 celles \u00e0 double vis"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3499\" class=\"elementor elementor-3499\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-07e4c7e e-flex e-con-boxed e-con e-parent\" data-id=\"07e4c7e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c1de964 elementor-widget elementor-widget-text-editor\" data-id=\"c1de964\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>If you&#8217;re only processing virgin resin, the output gap between single-screw and twin-screw extruders isn&#8217;t actually as large as people assume. But the moment recycled PET enters the mix, the output curves for the two diverge quickly \u2014 which is exactly why many factories re-evaluate whether they need a PET Single-Screw Sheet Extruder or a PET Twin-Screw Sheet Extruder when scaling up or switching to recycled material. This article breaks the question down: where the output difference actually comes from, when a single screw is enough, and when a twin screw becomes necessary.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9d87a13 elementor-widget elementor-widget-heading\" data-id=\"9d87a13\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Where the Output Difference Comes From: Structural Principles<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b3f4752 elementor-widget elementor-widget-text-editor\" data-id=\"b3f4752\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>To understand the output gap, you first need to understand the fundamental difference in how each screw type conveys and plasticizes the melt.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0b64e8b elementor-widget elementor-widget-heading\" data-id=\"0b64e8b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">How Single-Screw Extruders Work<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7b64780 elementor-widget elementor-widget-text-editor\" data-id=\"7b64780\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Single-screw extruders rely on friction between the screw and the barrel wall to convey material forward, with plasticization achieved through a combination of shear heat generated by screw rotation and external barrel heating. This design is fairly sensitive to feedstock uniformity \u2014 the closer the particle size, density, and melting point are across the batch, the more stable the conveying efficiency. The advantage of single-screw is its simple structure, lower cost, and lower maintenance \u2014 and it performs consistently well when processing uniform feedstock like virgin PET or APET pellets.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2fd1484 elementor-widget elementor-widget-heading\" data-id=\"2fd1484\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">How Twin-Screw Extruders Work<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e8ea4ab elementor-widget elementor-widget-text-editor\" data-id=\"e8ea4ab\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Twin-screw extruders (co-rotating, intermeshing design as the common example) use two interlocking screws to force material forward. Plasticization doesn&#8217;t rely mainly on barrel-wall friction, but on forced shear and mixing between the two screws. This &#8220;forced conveying&#8221; characteristic gives twin-screw extruders much higher tolerance for variation in feedstock shape, density, and moisture \u2014 whether it&#8217;s uniform virgin pellets or irregularly shaped, density-inconsistent recycled bottle flake, the conveying speed stays relatively stable.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b751c7d elementor-widget elementor-widget-heading\" data-id=\"b751c7d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How Raw Material Type Affects Output: Virgin vs. Recycled<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fecf3ae elementor-widget elementor-widget-text-editor\" data-id=\"fecf3ae\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The real variable behind the output gap isn&#8217;t the screw itself \u2014 it&#8217;s how much the feedstock &#8220;disrupts&#8221; the screw&#8217;s conveying efficiency.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-da7e5d5 elementor-widget elementor-widget-heading\" data-id=\"da7e5d5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Virgin Material Scenario: Single-Screw Is Usually Sufficient<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-575e92a elementor-widget elementor-widget-text-editor\" data-id=\"575e92a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>If the feedstock is 100% virgin PET or APET pellets with uniform particle size, consistent density, and controlled moisture, a single-screw extruder can typically maintain output at 90% or more of its rated capacity. In this scenario, single-screw actually offers better value than twin-screw, thanks to lower equipment investment and maintenance costs.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fc2c642 elementor-widget elementor-widget-heading\" data-id=\"fc2c642\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">As Recycled Content Increases: Single-Screw Output Drops Noticeably<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c9763d8 elementor-widget elementor-widget-text-editor\" data-id=\"c9763d8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>\u00b7 Uneven bulk density:<\/strong> Recycled bottle flake typically has a bulk density of only 40%-60% that of virgin pellets. Since single-screw channel volume is fixed, lower density means less actual material weight conveyed per unit time.<br \/><strong>\u00b7 Inconsistent melting behavior:<\/strong> Recycled material often mixes PET from different batches and IV values. The plasticizing zone of a single screw can&#8217;t dynamically adjust to this mixed state in real time, which can cause localized under-melting and slow down overall extrusion speed.<br \/><strong>\u00b7 Higher moisture and volatiles:<\/strong> Recycled material generally carries more moisture. Without mid-barrel degassing, single-screw extruders let moisture form bubbles in the melt, forcing operators to reduce screw speed to control the defect \u2014 which directly sacrifices output.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0fea3e9 elementor-widget elementor-widget-text-editor\" data-id=\"0fea3e9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Based on measured data from our customers, when recycled content reaches 50%, single-screw output typically drops 25%-35% compared to processing 100% virgin material. When recycled content reaches 100%, the output decline is generally above 40% \u2014 and in cases with higher contamination levels, it can exceed 50%.<br \/>Twin-screw extruders, thanks to their forced-conveying design and typically integrated multi-stage vacuum degassing, keep the output decline under roughly 15% even when running 100% recycled material \u2014 which is why factories processing recycled sheet almost universally lean toward twin-screw configurations.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f80a546 elementor-widget elementor-widget-heading\" data-id=\"f80a546\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Single-Screw vs. Twin-Screw Output Comparison Reference<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a42184f elementor-widget elementor-widget-text-editor\" data-id=\"a42184f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Note that the figures above reflect general industry performance with standard cleaned, crushed bottle flake. Actual numbers will vary based on contamination level, IV value fluctuation, and the equipment&#8217;s degassing configuration \u2014 always confirm with a trial run using your actual raw material.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8e6bd5c elementor-widget elementor-widget-image\" data-id=\"8e6bd5c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Comparison-of-Single-Screw-and-Twin-Screw-PET-Sheet-Extrusion-Lines-1024x576.jpg\" class=\"attachment-large size-large wp-image-3503\" alt=\"Comparison-of-Single-Screw-and-Twin-Screw-PET-Sheet-Extrusion-Lines\" srcset=\"https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Comparison-of-Single-Screw-and-Twin-Screw-PET-Sheet-Extrusion-Lines-1024x576.jpg 1024w, https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Comparison-of-Single-Screw-and-Twin-Screw-PET-Sheet-Extrusion-Lines-300x169.jpg 300w, https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Comparison-of-Single-Screw-and-Twin-Screw-PET-Sheet-Extrusion-Lines-768x432.jpg 768w, https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Comparison-of-Single-Screw-and-Twin-Screw-PET-Sheet-Extrusion-Lines-18x10.jpg 18w, https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Comparison-of-Single-Screw-and-Twin-Screw-PET-Sheet-Extrusion-Lines-600x338.jpg 600w, https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/09\/Comparison-of-Single-Screw-and-Twin-Screw-PET-Sheet-Extrusion-Lines.jpg 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-232c71e elementor-widget elementor-widget-heading\" data-id=\"232c71e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Case Study: From an Output Bottleneck to Doubled Production<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8c111b5 elementor-widget elementor-widget-text-editor\" data-id=\"8c111b5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A customer producing food-grade thermoformed trays had previously used a single-screw line to process a blend of 70% recycled and 30% virgin material, but actual output only reached about 55% of the equipment&#8217;s rated capacity, causing ongoing delivery delays. After evaluation, we recommended switching to a twin-screw PET sheet extrusion line configured with two-stage vacuum degassing and an automatic screen-changing filtration system.<br \/>After the switch, using the same material blend, actual output reached about 88% of rated capacity \u2014 nearly doubling production \u2014 while sheet haze and thickness stability also improved noticeably. This case illustrates that if a factory runs high-recycled-content material long-term, the output sacrificed by simply lowering screw speed to accommodate the material actually costs far more than the price difference of a twin-screw machine.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0ce5432 elementor-widget elementor-widget-heading\" data-id=\"0ce5432\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How to Choose: Single-Screw or Twin-Screw<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ffb7bb5 elementor-widget elementor-widget-text-editor\" data-id=\"ffb7bb5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>If output alone is the priority, the answer is clear: twin-screw is the safer choice, especially because it isn&#8217;t picky about feedstock \u2014 whether running virgin or recycled material, it maintains relatively stable, high output. That said, the choice should still be based on your actual production mix:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-276af09 elementor-widget elementor-widget-text-editor\" data-id=\"276af09\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>1. If your feedstock is consistently 100% virgin material year-round, a single-screw extruder remains the more cost-effective choice thanks to lower equipment cost and simpler maintenance<br \/>2. If your recycled content regularly exceeds 30%-40%, or you plan to increase it over time, a twin-screw extruder provides much more stable output \u2014 and the cost difference typically pays for itself faster than expected<br \/>3. If you need one line to flexibly switch between virgin and recycled material, twin-screw offers significantly more tolerance for feedstock variation, reducing downtime spent readjusting after material changes<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3eef65a elementor-widget elementor-widget-shortcode\" data-id=\"3eef65a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\"><p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which has higher output: a single-screw or twin-screw PET sheet extruder?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"When processing 100% virgin PET, single-screw and twin-screw extruders have similar output, both typically reaching over 90% of rated capacity. But as recycled content increases, twin-screw extruders maintain much higher output \u2014 losing under 15% even with 100% recycled material, compared to a 40%+ drop commonly seen with single-screw extruders.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why does recycled PET reduce output more on a single-screw extruder?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Recycled PET flake has lower and less consistent bulk density than virgin pellets, varies in IV value and melting behavior, and carries more moisture. 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