{"id":19,"date":"2026-11-06T19:04:04","date_gmt":"2026-11-06T11:04:04","guid":{"rendered":"https:\/\/kerkepm.com\/machines\/pelletizing\/"},"modified":"2026-11-11T23:40:55","modified_gmt":"2026-11-11T15:40:55","slug":"pelletizing-systems","status":"publish","type":"page","link":"https:\/\/kerkepm.com\/es\/machines\/pelletizing-systems\/","title":{"rendered":"Pelletizing Systems: 7 Methods Compared"},"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>Pelletizing systems<\/div><\/div><div class=\"wrap\"><div class=\"hero\">\n<p class=\"kicker\">Machine \u00b7 Pelletizing systems<\/p>\n<h1>Pelletizing Systems: 7 Methods Compared<\/h1>\n<p class=\"dek\">Seven pelletizing methods, and the wrong one costs more than the extruder difference: PVC needs air, PET needs water on the strand, high filler needs a die face, TPE needs underwater. A reference pelletizing systems page from Kerke.<\/p>\n<div class=\"byline\"><div><b>Updated<\/b> 6 November 2026<\/div><div><b>Scope<\/b> Water Ring \u00b7 Strand \u00b7 Underwater \u00b7 Air-Cooled<\/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-pelletizing-s1.webp\" alt=\"Pelletizing systems \u2014 workshop photo 1, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Pelletizing systems \u2014 workshop photo 1, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-pelletizing-s2.webp\" alt=\"Pelletizing systems \u2014 workshop photo 2, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Pelletizing systems \u2014 workshop photo 2, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-pelletizing-s3.webp\" alt=\"Pelletizing systems \u2014 workshop photo 3, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Pelletizing systems \u2014 workshop photo 3, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-pelletizing-s4.webp\" alt=\"Pelletizing systems \u2014 workshop photo 4, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Pelletizing systems \u2014 workshop photo 4, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-pelletizing-s5.webp\" alt=\"Pelletizing systems \u2014 workshop photo 5, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Pelletizing systems \u2014 workshop photo 5, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-pelletizing-s6.webp\" alt=\"Pelletizing systems \u2014 workshop photo 6, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Pelletizing systems \u2014 workshop photo 6, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><div class=\"ms-video\" data-yt=\"vRuTDyxcdH0\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/machine-pelletizing-s1.webp\" alt=\"Running video \u2014 Pelletizing systems, Kerke workshop\" loading=\"lazy\"><button type=\"button\" class=\"ms-play\" aria-label=\"Play video\">&#9654;<\/button><\/div><span class=\"ms-cap\">Running video \u2014 Pelletizing systems, 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\">The three rules we use<\/a><a href=\"#rm-s4\">Capacity is set by the die, not the cutter<\/a><a href=\"#rm-s5\">What this machine is normally bought for<\/a><\/nav><h2 id=\"rm-s1\">Quick answer<\/h2><p>Seven pelletizing methods cover every product we sell: <strong>water-cooled strand, air-cooled strand, water-ring strand, water ring hot die-face, air-cooled hot die-face, underwater hot die-face and spray drying<\/strong>. The choice follows the material \u2014 PVC and HFFR must be air-cooled, TPE and hot melt must be underwater, filler masterbatch is normally water ring.<\/p><\/section>\n<\/div>\n<\/div><\/div>\n<div class=\"wrap\"><div class=\"grid\"><main>\n<div class=\"stats\"><div class=\"stat\"><b>7 methods<\/b><span>compared in one page<\/span><\/div><div class=\"stat\"><b>0.5\u20138 mm<\/b><span>pellet size<\/span><\/div><div class=\"stat\"><b>up to 4,000 kg\/h<\/b><span>capacity<\/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> Pelletizing systems \u2014 models and reference output.<\/caption>\n<thead><tr><th scope=\"col\">Method<\/th><th scope=\"col\">Best for<\/th><th scope=\"col\">Output range<\/th><th scope=\"col\">Watch out<\/th><\/tr><\/thead><tbody><tr><td class=\"num\"><a href=\"\/machines\/pelletizing-systems\/water-strand-pelletizing\/\">Water-cooled strand<\/a><\/td><td class=\"num\">Filler\/colour masterbatch, engineering plastics<\/td><td class=\"num\">100\u20132,000 kg\/h<\/td><td class=\"num\">Floor space, strand breakage at high filler<\/td><\/tr><tr><td class=\"num\"><a href=\"\/machines\/pelletizing-systems\/air-strand-pelletizing\/\">Air-cooled strand<\/a><\/td><td class=\"num\">PLA, starch blends, moisture-sensitive polymers<\/td><td class=\"num\">100\u2013800 kg\/h<\/td><td class=\"num\">Slow cooling, longer line<\/td><\/tr><tr><td class=\"num\"><a href=\"\/machines\/pelletizing-systems\/water-ring-strand-pelletizing\/\">Water ring strand<\/a><\/td><td class=\"num\">PET, PA, high-temperature polymers<\/td><td class=\"num\">300\u20132,000 kg\/h<\/td><td class=\"num\">Water temperature control<\/td><\/tr><tr><td class=\"num\"><a href=\"\/machines\/pelletizing-systems\/water-ring-hot-face-pelletizing\/\">Water ring hot die-face<\/a><\/td><td class=\"num\">Filler\/black masterbatch, PE\/PP<\/td><td class=\"num\">200\u20132,000 kg\/h<\/td><td class=\"num\">Die hole blockage at high filler<\/td><\/tr><tr><td class=\"num\"><a href=\"\/machines\/pelletizing-systems\/air-hot-face-pelletizing\/\">Air-cooled hot die-face<\/a><\/td><td class=\"num\">PVC, HFFR\/LSZH, XLPE, WPC<\/td><td class=\"num\">100\u20131,500 kg\/h<\/td><td class=\"num\">Air flow uniformity, dust<\/td><\/tr><tr><td class=\"num\"><a href=\"\/machines\/pelletizing-systems\/underwater-pelletizing\/\">Underwater hot die-face<\/a><\/td><td class=\"num\">TPE\/TPU, hot melt, EPP, compounds needing round pellets<\/td><td class=\"num\">200\u20132,000 kg\/h<\/td><td class=\"num\">Water temperature and flow; die freeze-off on start-up<\/td><\/tr><tr><td class=\"num\"><a href=\"\/machines\/pelletizing-systems\/spray-drying-pelletizing\/\">Spray drying<\/a><\/td><td class=\"num\">PET with high water carry-over, sticky products<\/td><td class=\"num\">300\u20131,500 kg\/h<\/td><td class=\"num\">Energy cost<\/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\">The three rules we use<\/h2>\n\n<ol>\n\n<li><strong>If water causes hydrolysis, cool with air.<\/strong> PVC, HFFR, XLPE and WPC all fall here. Water cooling gives black specks or voids.<\/li>\n\n<li><strong>If the pellet must be round and free-flowing, go underwater.<\/strong> TPE, TPU, hot melt and EPP block in a bag when strand-cut.<\/li>\n\n<li><strong>If the melt is highly filled, prefer hot die-face.<\/strong> Strands break at 85% CaCO<sub>3<\/sub>; cutting at the die avoids the problem entirely.<\/li>\n\n<\/ol>\n\n<h2 class=\"sec\" id=\"rm-s4\">Capacity is set by the die, not the cutter<\/h2>\n\n<p>Die hole count and diameter determine output per revolution. A pelletizer rated \"2,000 kg\/h\" with a 40-hole die cannot deliver that on a 3 mm pellet \u2014 check the die, not the label.<\/p><\/div>\n\n<h2 class=\"sec\" id=\"apps\" id=\"rm-s5\">What this machine is normally bought for<\/h2>\n<div class=\"cards\"><a class=\"card\" href=\"\/applications\/filler-masterbatch-line\/\"><h3>Filler Masterbatch Extruder Line<\/h3><p>Filler masterbatch is sold by the tonne, so the line is judged on two numbers only: how much powder it can swallow, an\u2026<\/p><span class=\"meta\">85\u201390% CaCO<sub>3<\/sub> at 350\u2013550 kg\/h<\/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\/tpe-tpu-tpr-pelletizing\/\"><h3>TPE \/ TPU \/ TPR Elastomer Line<\/h3><p>Elastomer compounding is dominated by oil: SEBS takes 100\u2013300 phr, and injecting it all at once makes the screw slip i\u2026<\/p><span class=\"meta\">Hardness 30\u201390A<\/span><\/a><a class=\"card\" href=\"\/applications\/pet-pelletizing\/\"><h3>PET Bottle Flake Recycling & Pelletizing Line<\/h3><p>PET is judged on one number after pelletizing: intrinsic viscosity. Water and heat destroy it, so drying, low-shear sc\u2026<\/p><span class=\"meta\">Keep the IV<\/span><\/a><\/div>\n\n<h2 class=\"sec\" id=\"faq\" id=\"rm-s6\">FAQ<\/h2>\n<details open><summary>Which pelletizing method should I choose?<\/summary><p>Follow the polymer first: water-cooled strand below 50% filler and for PET; water ring at 70\u201385% filler; air-cooled hot face for PVC, HFFR and WPC; underwater for TPE\/TPU and EPP beads.<\/p><\/details><details><summary>What is the difference between water ring and underwater?<\/summary><p>Water ring cuts at the die face with water sprayed at an angle, so pellets are cooled in a ring of water and leave with 8\u201312% moisture. Underwater cuts in a full water chamber at higher pressure and gives rounder, denser pellets \u2014 necessary for elastomers and bead products.<\/p><\/details><details><summary>Can I change method later?<\/summary><p>The pelletizer is a module. If the die and the discharge are designed for it, a strand line can become a water-ring line in two days.<\/p><\/details>\n\n<div class=\"method\"><h2 id=\"rm-s7\">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-s8\">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\/spare-parts\/\"><span>Machine<\/span>Auxiliary & spare parts<\/a><a class=\"rel\" href=\"\/applications\/filler-masterbatch-line\/\"><span>Application<\/span>Filler Masterbatch Extruder Line<\/a><a class=\"rel\" href=\"\/applications\/pvc-compounding-line\/\"><span>Application<\/span>PVC Compounding 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\": \"Pelletizing Systems: 7 Methods Compared\", \"brand\": {\"@type\": \"Brand\", \"name\": \"Kerke\"}, \"description\": \"Seven pelletizing methods, and the wrong one costs more than the extruder difference: PVC needs air, PET needs water on the strand, high filler needs a die face, TPE needs underwater.\", \"category\": \"Pelletizing systems\", \"additionalProperty\": [{\"@type\": \"PropertyValue\", \"name\": \"Scope\", \"value\": \"Water Ring \u00b7 Strand \u00b7 Underwater \u00b7 Air-Cooled\"}]}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Which pelletizing method should I choose?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Follow the polymer first: water-cooled strand below 50% filler and for PET; water ring at 70\u201385% filler; air-cooled hot face for PVC, HFFR and WPC; underwater for TPE\/TPU and EPP beads.\"}}, {\"@type\": \"Question\", \"name\": \"What is the difference between water ring and underwater?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Water ring cuts at the die face with water sprayed at an angle, so pellets are cooled in a ring of water and leave with 8\u201312% moisture. 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If the die and the discharge are designed for it, a strand line can become a water-ring line in two days.\"}}]}, {\"@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\": \"Pelletizing systems\"}]}]}<\/script>\n<div class=\"wrap\"><section class=\"k3-more\" id=\"rm-more\"><h2>Pelletizing systems \u2014 the short version<\/h2><p>Note on pelletizing systems: 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 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\/Pelletizing systems Machine \u00b7 Pelletizing systems Pelletizing Systems: 7 Methods Compared Seven pelletizing methods, and the wrong one costs more than the extruder difference: PVC needs air, PET needs water on the strand, high filler needs a die face, TPE needs underwater. A reference pelletizing systems page from Kerke. 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