{"id":14,"date":"2026-11-06T19:04:04","date_gmt":"2026-11-06T11:04:04","guid":{"rendered":"https:\/\/kerkepm.com\/machines\/two-stage\/"},"modified":"2026-11-11T23:40:56","modified_gmt":"2026-11-11T15:40:56","slug":"two-stage-extruder","status":"publish","type":"page","link":"https:\/\/kerkepm.com\/es\/machines\/two-stage-extruder\/","title":{"rendered":"Two-Stage Extruder KTE\/SE (Twin Screw + Single Screw)"},"content":{"rendered":"<div class=\"k3\">\n<div class=\"wrap\"><div class=\"crumbs\"><a href=\"\/\">Home<\/a><span>\/<\/span><a href=\"\/machines\/\">Machines<\/a><span>\/<\/span>Two-stage KTE\/SE<\/div><\/div><div class=\"wrap\"><div class=\"hero\">\n<p class=\"kicker\">Machine \u00b7 Two-stage KTE\/SE<\/p>\n<h1>Two-Stage Extruder KTE\/SE (Twin Screw + Single Screw)<\/h1>\n<p class=\"dek\">Two machines, two jobs: the twin screw mixes and devolatilizes, the single screw only builds pressure. It is how 88% filler and PVC compound keep their output as viscosity climbs. A reference two-stage extruder page from Kerke.<\/p>\n<div class=\"byline\"><div><b>Updated<\/b> 6 November 2026<\/div><div><b>Scope<\/b> Stable Output at 85\u201390% Filling<\/div>\n<div><b>Delivery<\/b> 30\u201345 working days<\/div><div><b>Voltage<\/b> built for destination<\/div><\/div>\n<\/div><\/div>\n<div class=\"wrap\"><div class=\"appmedia\">\n<div class=\"mslider\" id=\"appslider\">\n<div class=\"ms-frame\"><div class=\"ms-slide on\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-two-stage-s1.webp\" alt=\"two-stage extruder\" loading=\"lazy\"><span class=\"ms-cap\">Two-stage KTE SE \u2014 workshop photo 1, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-two-stage-s2.webp\" alt=\"Two-stage KTE SE \u2014 workshop photo 2, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Two-stage KTE SE \u2014 workshop photo 2, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-two-stage-s3.webp\" alt=\"Two-stage KTE SE \u2014 workshop photo 3, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Two-stage KTE SE \u2014 workshop photo 3, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-two-stage-s4.webp\" alt=\"Two-stage KTE SE \u2014 workshop photo 4, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Two-stage KTE SE \u2014 workshop photo 4, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-two-stage-s5.webp\" alt=\"Two-stage KTE SE \u2014 workshop photo 5, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Two-stage KTE SE \u2014 workshop photo 5, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-two-stage-s6.webp\" alt=\"Two-stage KTE SE \u2014 workshop photo 6, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Two-stage KTE SE \u2014 workshop photo 6, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><div class=\"ms-video\" data-yt=\"gqIAraC9-t4\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-two-stage-s1.webp\" alt=\"Running video \u2014 Two-stage KTE SE, Kerke workshop\" loading=\"lazy\"><button type=\"button\" class=\"ms-play\" aria-label=\"Play video\">&#9654;<\/button><\/div><span class=\"ms-cap\">Running video \u2014 Two-stage KTE SE, Kerke workshop<\/span><\/div><\/div>\n<button type=\"button\" class=\"ms-nav prev\" aria-label=\"Previous slide\">&#8249;<\/button>\n<button type=\"button\" class=\"ms-nav next\" aria-label=\"Next slide\">&#8250;<\/button>\n<div class=\"ms-dots\"><button type=\"button\" data-i=\"0\" class=\"ms-dot on\" aria-label=\"Slide 1\"><\/button><button type=\"button\" data-i=\"1\" class=\"ms-dot\" aria-label=\"Slide 2\"><\/button><button type=\"button\" data-i=\"2\" class=\"ms-dot\" aria-label=\"Slide 3\"><\/button><button type=\"button\" data-i=\"3\" class=\"ms-dot\" aria-label=\"Slide 4\"><\/button><button type=\"button\" data-i=\"4\" class=\"ms-dot\" aria-label=\"Slide 5\"><\/button><button type=\"button\" data-i=\"5\" class=\"ms-dot\" aria-label=\"Slide 6\"><\/button><button type=\"button\" data-i=\"6\" class=\"ms-dot\" aria-label=\"Slide 7\"><\/button><\/div>\n<\/div>\n<div class=\"appmedia-text\">\n<section class=\"qa\" id=\"answer\"><nav class=\"wp-block-rank-math-toc-block k3-toc\" aria-label=\"On this page\"><b>On this page:<\/b><a href=\"#rm-s1\">Quick answer<\/a><a href=\"#rm-s2\">Parameter table<\/a><a href=\"#rm-s3\">Why not just a bigger twin screw?<\/a><a href=\"#rm-s4\">What this machine is normally bought for<\/a><a href=\"#rm-s5\">FAQ<\/a><\/nav><h2 id=\"rm-s1\">Quick answer<\/h2><p>A two-stage KTE\/SE line pairs a twin screw (compounding, devolatilization) with a single screw (pressure build-up). It is the standard answer for <strong>85\u201390% filler masterbatch, PVC compound and HFFR cable compound<\/strong>, at <strong>300\u20132,000 kg\/h<\/strong>. The split protects the gearbox and flattens output variation.<\/p><\/section>\n<\/div>\n<\/div><\/div>\n<div class=\"wrap\"><div class=\"grid\"><main>\n<div class=\"stats\"><div class=\"stat\"><b>300\u20132,000 kg\/h<\/b><span>output<\/span><\/div><div class=\"stat\"><b>85\u201390%<\/b><span>filler capability<\/span><\/div><div class=\"stat\"><b>4 sizes<\/b><span>KTE\/SE combinations<\/span><\/div><\/div>\n<p class=\"note\">Workshop photos and a running video \u2014 shot on our own lines, not stock images.<\/p>\n\n<h2 class=\"sec\" id=\"specs\" id=\"rm-s2\">Parameter table<\/h2>\n<div class=\"tw\"><table><caption><b>Table 1.<\/b> Two-stage KTE\/SE \u2014 models and reference output.<\/caption>\n<thead><tr><th scope=\"col\">Configuration<\/th><th scope=\"col\">Stage 1 (twin screw)<\/th><th scope=\"col\">Stage 2 (single screw)<\/th><th scope=\"col\">Output (kg\/h)<\/th><th scope=\"col\">Typical product<\/th><\/tr><\/thead><tbody><tr><td class=\"num\"><a href=\"\/machines\/kte-50b-se-120-two-stage-extruder\/\">KTE-50B \/ SE-120<\/a><\/td><td class=\"num\">50.5 mm<\/td><td class=\"num\">120 mm<\/td><td class=\"num\">300\u2013500<\/td><td class=\"num\">Colour \/ filler masterbatch<\/td><\/tr><tr><td class=\"num\"><a href=\"\/machines\/kte-65b-se-150-two-stage-extruder\/\">KTE-65B \/ SE-150<\/a><\/td><td class=\"num\">62.4 mm<\/td><td class=\"num\">150 mm<\/td><td class=\"num\">500\u2013800<\/td><td class=\"num\">Filler masterbatch 85%, PVC<\/td><\/tr><tr><td class=\"num\"><a href=\"\/machines\/kte-75b-se-180-two-stage-extruder\/\">KTE-75B \/ SE-180<\/a><\/td><td class=\"num\">71 mm<\/td><td class=\"num\">180 mm<\/td><td class=\"num\">700\u20131,200<\/td><td class=\"num\">High filler 88\u201390%, HFFR<\/td><\/tr><tr><td class=\"num\"><a href=\"\/machines\/kte-95b-se-200-two-stage-extruder\/\">KTE-95B \/ SE-200<\/a><\/td><td class=\"num\">93 mm<\/td><td class=\"num\">200 mm<\/td><td class=\"num\">1,000\u20132,000<\/td><td class=\"num\">High filler, cable compound<\/td><\/tr><\/tbody><\/table><\/div>\n<p class=\"note\">Reference output measured on the stated material family; subject to a material trial. Motor and torque values are per machine, not per screw shaft.<\/p>\n\n<div id=\"detail\"><h2 class=\"sec\" id=\"rm-s3\">Why not just a bigger twin screw?<\/h2>\n\n<p>Because the limit is torque, not diameter. At 88% CaCO<sub>3<\/sub> the melt is a paste; the twin screw must disperse it, and the single screw only has to push it through the die. Putting both duties on one twin screw means oversizing the gearbox by 40\u201360% and still running at reduced output.<\/p>\n\n<p>Three products where the two-stage wins:<\/p>\n\n<ul>\n\n<li><strong>High filler masterbatch 85\u201390%<\/strong> \u2014 output stays flat as filler content climbs; the single screw absorbs die pressure variation.<\/li>\n\n<li><strong>PVC compound<\/strong> \u2014 the twin screw gels fast, the single screw pressurizes without extra shear, which is exactly what PVC needs to avoid degradation.<\/li>\n\n<li><strong>HFFR \/ LSZH cable compound<\/strong> \u2014 55\u201370% ATH or MDH; low shear in stage 2 protects the filler from decomposing.<\/li>\n\n<\/ul>\n\n<h3>Pelletizing<\/h3>\n\n<p>Water ring for filler masterbatch, air-cooled hot die-face for PVC and HFFR (water causes hydrolysis), strand where pellet shape matters. See the <a href=\"\/machines\/pelletizing-systems\/\">pelletizing comparison<\/a>.<\/p><\/div>\n\n<h2 class=\"sec\" id=\"apps\" id=\"rm-s4\">What this machine is normally bought for<\/h2>\n<div class=\"cards\"><a class=\"card\" href=\"\/applications\/high-filler-masterbatch-line\/\"><h3>High Filler Masterbatch Line<\/h3><p>Above 85% the melt stops behaving like a polymer. Output no longer follows screw speed, and the machine that held 82% \u2026<\/p><span class=\"meta\">80\u201390% Filling, Stable Output<\/span><\/a><a class=\"card\" href=\"\/applications\/black-masterbatch-line\/\"><h3>Black Masterbatch Extruder Line<\/h3><p>Carbon black at 40% costs 20\u201325% of the output of a general colour masterbatch on the same machine \u2014 dispersion eats t\u2026<\/p><span class=\"meta\">Up to 40% Carbon Black<\/span><\/a><a class=\"card\" href=\"\/applications\/pvc-compounding-line\/\"><h3>PVC Compounding Line<\/h3><p>PVC is heat-sensitive and water-sensitive at the same time, which rules out both long residence time and water contact\u2026<\/p><span class=\"meta\">Why Air-Cooling Hot-Face Cutting<\/span><\/a><a class=\"card\" href=\"\/applications\/hffr-cable-compound\/\"><h3>HFFR \/ LSZH Cable Compound Line<\/h3><p>HFFR compound carries 50\u201360% metal hydroxide, which starts decomposing around 180 \u00b0C. The line has to disperse it thor\u2026<\/p><span class=\"meta\">High Mg(OH)<sub>2<\/sub> Filling<\/span><\/a><\/div>\n\n<h2 class=\"sec\" id=\"faq\" id=\"rm-s5\">FAQ<\/h2>\n<details open><summary>When is a two-stage line unavoidable?<\/summary><p>Three cases: filler masterbatch above 85%, PVC compound where shear must stay low after gelling, and HFFR with 50\u201360% metal hydroxide. In all three, mixing and pressure build-up on one shaft costs 30\u201340% of output.<\/p><\/details><details><summary>Can I upgrade a single twin screw later?<\/summary><p>Yes \u2014 the SE discharge stage can be added to an existing KTE installation if floor space allows. It is cheaper than replacing the gearbox, and it keeps the twin screw you already own.<\/p><\/details><details><summary>Which pelletizer goes with a two-stage line?<\/summary><p>Water ring for filler masterbatch, air-cooled hot face for PVC and HFFR, strand where pellet shape matters. The choice is set by the polymer, not by the line type.<\/p><\/details>\n\n<div class=\"method\"><h2 id=\"rm-s6\">Where these numbers come from<\/h2>\n<p>Screw diameters, speeds, motor ratings, torque and reference output come from the Kerke parameter table and the product master data sheet, and are cross-checked against commissioning records. Where a catalogue value and a trial value disagree, the trial value is the one we quote.<\/p>\n<p>Reviewed by the Kerke process team, Nanjing. Page updated 6 November 2026.<\/p><\/div>\n\n<div class=\"related\"><h2 id=\"rm-s7\">Related<\/h2><div class=\"rel-grid\"><a class=\"rel\" href=\"\/machines\/co-rotating-twin-screw-extruder\/\"><span>Machine<\/span>Co-rotating twin screw KTE<\/a><a class=\"rel\" href=\"\/machines\/single-screw-extruder\/\"><span>Machine<\/span>Single screw SE<\/a><a class=\"rel\" href=\"\/applications\/high-filler-masterbatch-line\/\"><span>Application<\/span>High Filler Masterbatch Line<\/a><a class=\"rel\" href=\"\/applications\/black-masterbatch-line\/\"><span>Application<\/span>Black Masterbatch Extruder Line<\/a><\/div><\/div>\n<div class=\"cta\"><div><b>Need a capacity number for your material?<\/b><p>Send 25\u201350 kg \u2014 we return pellets, a video and a report with the parameters we used, in 3\u20137 days.<\/p><\/div>\n<div class=\"acts\"><a href=\"\/get-a-quote\/\">Get a quote<\/a>\n<a class=\"alt\" href=\"\/get-a-quote\/#trial\">Send material for trial<\/a><\/div><\/div>\n<\/main>\n<aside><h5>On this page<\/h5><ol><li><a href=\"#answer\">Quick answer<\/a><\/li><li><a href=\"#specs\">Parameter table<\/a><\/li><li><a href=\"#detail\">Selection detail<\/a><\/li><li><a href=\"#apps\">Applications<\/a><\/li><li><a href=\"#faq\">FAQ<\/a><\/li><\/ol>\n<div class=\"sidecard\"><b>Model or trial first?<\/b><p>A model number tells you the envelope; a trial tells you the output. We quote the second one.<\/p>\n<a class=\"btn\" href=\"\/get-a-quote\/\">Request a quote<\/a>\n<a class=\"btn ghost\" href=\"\/machines\/\">All machines<\/a><\/div><\/aside><\/div><\/div>\n<script>\n(function(){\n  var root=document.getElementById('appslider'); if(!root) return;\n  var slides=[].slice.call(root.querySelectorAll('.ms-slide'));\n  var dots=[].slice.call(root.querySelectorAll('.ms-dot'));\n  var cur=0, timer=null, locked=false;\n  function show(i){\n    cur=(i+slides.length)%slides.length;\n    slides.forEach(function(s,j){\n      s.classList.toggle('on', j===cur);\n      var v=s.querySelector('.ms-video');\n      if(j!==cur && v){ var f=v.querySelector('iframe');\n        if(f){ f.remove(); var p=v.querySelector('.ms-play'); if(p) p.style.display=''; } }\n    });\n    dots.forEach(function(d,j){ d.classList.toggle('on', j===cur); });\n    var v=slides[cur].querySelector('.ms-video');\n    if(v){ locked=true; stop(); playVideo(v); }\n  }\n  \/* \u81ea\u52a8\u64ad\u653e\uff1a3s \u4e00\u5f20\uff1b\u60ac\u505c\u6682\u505c\uff0c\u79fb\u51fa\u6062\u590d\uff1b\u8f6e\u5230\u89c6\u9891\u81ea\u52a8\u9759\u97f3\u64ad\u653e\u5e76\u505c\u7559\uff08locked\uff09\uff0c\u624b\u52a8\u5207\u6362\u540e\u6062\u590d\u8f6e\u64ad *\/\n  function start(){ if(timer || document.hidden || locked) return; timer=setInterval(function(){ show(cur+1); }, 3000); }\n  function stop(){ if(timer){ clearInterval(timer); timer=null; } }\n  function playVideo(v){\n    if(v.querySelector('iframe')) return;\n    var f=document.createElement('iframe');\n    f.src='https:\/\/www.youtube.com\/embed\/'+v.dataset.yt+'?autoplay=1&mute=1&rel=0';\n    f.setAttribute('allow','autoplay; encrypted-media; picture-in-picture');\n    f.setAttribute('allowfullscreen','');\n    var p=v.querySelector('.ms-play'); if(p) p.style.display='none';\n    v.insertBefore(f, p);\n  }\n  function manual(i){ locked=false; show(i); start(); }\n  document.addEventListener('visibilitychange', function(){ if(document.hidden) stop(); else start(); });\n  root.addEventListener('mouseenter', stop);\n  root.addEventListener('mouseleave', function(){ if(!locked) start(); });\n  root.querySelector('.prev').addEventListener('click', function(){ manual(cur-1); });\n  root.querySelector('.next').addEventListener('click', function(){ manual(cur+1); });\n  dots.forEach(function(d){ d.addEventListener('click', function(){ manual(+d.dataset.i); }); });\n  root.addEventListener('click', function(e){\n    var p=e.target.closest('.ms-play'); if(!p) return;\n    locked=true; stop(); playVideo(p.parentNode);\n  });\n  show(0);\n  start();\n})();\n<\/script>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@graph\": [{\"@type\": \"Product\", \"name\": \"Two-Stage Extruder KTE\/SE (Twin Screw + Single Screw)\", \"brand\": {\"@type\": \"Brand\", \"name\": \"Kerke\"}, \"description\": \"Two machines, two jobs: the twin screw mixes and devolatilizes, the single screw only builds pressure. 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The choice is set by the polymer, not by the line type.\"}}]}, {\"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/www.kerkepm.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Machines\", \"item\": \"https:\/\/www.kerkepm.com\/machines\/\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Two-stage KTE\/SE\"}]}]}<\/script>\n<div class=\"wrap\"><section class=\"k3-more\" id=\"rm-more\"><h2>Two-stage extruder \u2014 the short version<\/h2><p>Note on two-stage extruder: what separates one machine from another is torque class, L\/D and the wear package matched to your material, not the build standard. Shortlist from the tables, then confirm the choice on a trial with your own powder.<\/p><p>Planning an upgrade this quarter? Send the material and the target output \u2014 the configuration comes back within one working day.<\/p><p>Every quotation lists the wear package as a separate line, so its cost is visible from day one.<\/p><p>Questions are answered the same day, in English or Chinese.<\/p><p>Note on two-stage extruder: the data on this page was last verified on our own test line in Nanjing.<\/p><p>Not sure which two-stage extruder configuration fits? Describe the material and the pellet shape required \u2014 we answer with a recommendation, not a brochure.<\/p><p>A two-stage extruder from Kerke ships with CE documentation, a test-run record and a recommended spare set.<\/p><p class=\"k3-rel\"><b>Related on this site:<\/b> <a href=\"\/applications\/\">Extrusion lines by application<\/a> \u00b7 <a href=\"\/knowledge\/\">Extruder selection guide<\/a> \u00b7 <a href=\"\/get-a-quote\/\">free extrusion line quotation<\/a> \u00b7 <a href=\"https:\/\/en.wikipedia.org\/wiki\/Twin-screw_extruder\" target=\"_blank\" rel=\"noopener\">Wikipedia: Twin-screw extruder<\/a><\/p><\/section><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Home\/Machines\/Two-stage KTE\/SE Machine \u00b7 Two-stage KTE\/SE Two-Stage Extruder KTE\/SE (Twin Screw + Single Screw) Two machines, two jobs: the twin screw mixes and devolatilizes, the single screw only builds pressure. It is how 88% filler and PVC compound keep their output as viscosity climbs. A reference two-stage extruder page from Kerke. Updated 6 November 2026Scope [&#8230;]\n","protected":false},"author":0,"featured_media":1727,"parent":11,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"page-blank.php","meta":{"footnotes":""},"application":[],"app_group":[],"class_list":["post-14","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/pages\/14","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/types\/page"}],"replies":[{"embeddable":true,"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/comments?post=14"}],"version-history":[{"count":0,"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/pages\/14\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/pages\/11"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/media\/1727"}],"wp:attachment":[{"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/media?parent=14"}],"wp:term":[{"taxonomy":"application","embeddable":true,"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/application?post=14"},{"taxonomy":"app_group","embeddable":true,"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/app_group?post=14"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}