{"id":2787,"date":"2026-11-11T19:46:54","date_gmt":"2026-11-11T11:46:54","guid":{"rendered":"https:\/\/kerkepm.com\/machines\/pelletizing-systems\/underwater-pelletizing\/"},"modified":"2026-11-11T23:40:50","modified_gmt":"2026-11-11T15:40:50","slug":"underwater-pelletizing","status":"publish","type":"page","link":"https:\/\/kerkepm.com\/es\/machines\/pelletizing-systems\/underwater-pelletizing\/","title":{"rendered":"Underwater Hot Die-Face Pelletizing"},"content":{"rendered":"<div class=\"k3\">\r\n<div class=\"wrap\"><div class=\"crumbs\"><a href=\"\/\">Home<\/a><span>\/<\/span><a href=\"\/machines\/\">Machines<\/a><span>\/<\/span><a href=\"\/machines\/pelletizing-systems\/\">Pelletizing systems<\/a><span>\/<\/span>Underwater Hot Die-Face Pelletizing<\/div><\/div><div class=\"wrap\"><div class=\"hero\">\r\n<p class=\"kicker\">Pelletizing \u00b7 Underwater Hot Die-Face Pelletizing<\/p>\r\n<h1>Underwater Hot Die-Face Pelletizing: How Kerke Builds It<\/h1>\r\n<p class=\"dek\">Knives cutting inside a pressurized water chamber \u2014 perfectly round, dense pellets for TPE\/TPU, hot melt adhesives, EPP beads and every product where shape is part of the spec.<\/p>\r\n<div class=\"byline\"><div><b>Updated<\/b> 11 November 2026<\/div><div><b>Scope<\/b> TPE\/TPU \u00b7 hot melt \u00b7 EPP beads\r\n<\/div><div><b>Output<\/b> 200\u20132,000 kg\/h<\/div><div><b>Pellet<\/b> Round, dense<\/div><\/div>\r\n<\/div><\/div>\r\n<div class=\"wrap\"><div class=\"appmedia\">\r\n<div class=\"mslider\" id=\"appslider\">\r\n<div class=\"ms-frame\"><div class=\"ms-slide on\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/pel-underwater-s1.webp\" alt=\"Underwater Hot Die-Face Pelletizing \u2014 workshop photo 1, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Underwater Hot Die-Face Pelletizing \u2014 workshop photo 1, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/pel-underwater-s2.webp\" alt=\"Underwater Hot Die-Face Pelletizing \u2014 workshop photo 2, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Underwater Hot Die-Face Pelletizing \u2014 workshop photo 2, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/pel-underwater-s3.webp\" alt=\"Underwater Hot Die-Face Pelletizing \u2014 workshop photo 3, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Underwater Hot Die-Face Pelletizing \u2014 workshop photo 3, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/pel-underwater-s4.webp\" alt=\"Underwater Hot Die-Face Pelletizing \u2014 workshop photo 4, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Underwater Hot Die-Face Pelletizing \u2014 workshop photo 4, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/pel-underwater-s5.webp\" alt=\"Underwater Hot Die-Face Pelletizing \u2014 workshop photo 5, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Underwater Hot Die-Face Pelletizing \u2014 workshop photo 5, Kerke workshop, Nanjing<\/span><\/div><div class=\"ms-slide\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/pel-underwater-s6.webp\" alt=\"Underwater Hot Die-Face Pelletizing \u2014 workshop photo 6, Kerke workshop, Nanjing\" loading=\"lazy\"><span class=\"ms-cap\">Underwater Hot Die-Face Pelletizing \u2014 workshop photo 6, Kerke workshop, Nanjing<\/span><\/div><\/div>\r\n<button type=\"button\" class=\"ms-nav prev\" aria-label=\"Previous slide\">&#8249;<\/button>\r\n<button type=\"button\" class=\"ms-nav next\" aria-label=\"Next slide\">&#8250;<\/button>\r\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><\/div>\r\n<\/div>\r\n<div class=\"appmedia-text\">\r\n<nav class=\"wp-block-rank-math-toc-block k3-toc\" aria-label=\"On this page\"><b>On this page:<\/b><a href=\"#answer\">Quick answer<\/a><a href=\"#how\">How it works<\/a><a href=\"#fit\">Where it wins<\/a><a href=\"#specs\">Reference data<\/a><a href=\"#faq\">FAQ<\/a><\/nav>\r\n<section class=\"qa\" id=\"answer\"><h2 id=\"rm-s1\">Quick answer<\/h2><p>Underwater pelletizing cuts the melt at the die face inside a flooded, pressurized chamber. Pellets are round, dense and dust-free straight out of the water \u2014 the required shape for TPE\/TPU, hot melt adhesives, EPP expandable beads and spun-grade or foam-grade polymers where irregular pellets would feed unevenly.<\/p><\/section>\r\n<\/div>\r\n<\/div><\/div>\r\n<div class=\"wrap\"><div class=\"grid\"><main>\r\n<div class=\"stats\"><div class=\"stat\"><b>200\u20132,000 kg\/h<\/b><span>capacity range<\/span><\/div><div class=\"stat\"><b>\u22481.0<\/b><span>pellet roundness<\/span><\/div><div class=\"stat\"><b>8 bar<\/b><span>typical chamber pressure<\/span><\/div><div class=\"stat\"><b>\u00b12 \u00b0C<\/b><span>chamber water band<\/span><\/div><\/div>\r\n<p class=\"note\">Workshop photos \u2014 shot on our own lines in Nanjing, not stock images.<\/p>\r\n\r\n<h2 class=\"sec\" id=\"how\">How the underwater hot die-face pelletizing line works<\/h2>\r\n<ol>\r\n<li>Melt enters a circular die plate inside the water-filled cutting chamber.<\/li><li>Rotating hub knives cut pellets flush at the die face under water pressure.<\/li><li>Chamber water flow carries pellets up the discharge pipe to a dewatering screen.<\/li><li>Centrifugal drying brings surface moisture below 0.2%.<\/li><li>Start-up is automated: chamber pre-heating and a scrap diversion sequence prevent die freeze-off.<\/li>\r\n<\/ol>\r\n\r\n<h2 class=\"sec\" id=\"fit\">Where this method wins<\/h2>\r\n<p>Underwater wins where pellet geometry is functional: EPP beads must be round to roll evenly in moulds; hot melt adhesives must flow; TPE\/TPU blocks when strand-cut because the material is tacky; and spinning or foaming grades need dust-free round pellets. The costs are a more complex start-up and higher maintenance skill \u2014 we automate both.<\/p>\r\n\r\n<h2 class=\"sec\" id=\"specs\">Reference data<\/h2>\r\n<div class=\"tw\"><table><caption><b>Table 1.<\/b> Underwater Hot Die-Face Pelletizing \u2014 reference selection data.<\/caption>\r\n<thead><tr><th scope=\"col\">Item<\/th><th scope=\"col\">Value<\/th><\/tr><\/thead><tbody><tr><td class=\"num\">Best for<\/td><td class=\"num\">TPE\/TPU, hot melt adhesive, EPP beads, round-pellet polymers<\/td><\/tr><tr><td class=\"num\">Output range<\/td><td class=\"num\">200\u20132,000 kg\/h<\/td><\/tr><tr><td class=\"num\">Pellet shape<\/td><td class=\"num\">Round, dense, dust-free<\/td><\/tr><tr><td class=\"num\">Watch out<\/td><td class=\"num\">Water temperature and flow, die freeze-off at start-up<\/td><\/tr><\/tbody><\/table><\/div>\r\n<p class=\"note\">Reference output measured on the stated material family; subject to a material trial. Die hole count sets the capacity ceiling \u2014 check the die, not the label.<\/p>\r\n\r\n<h2 class=\"sec\" id=\"notes\">Selection notes from our floor<\/h2>\r\n<p>Water temperature inside the chamber is material-specific \u2014 TPU wants warm water so pellets do not freeze into tails, EPP wants cold water for bead stability. Our standard control loop holds chamber water within \u00b12 \u00b0C and sequences the start-up so the die never sees stagnant water.<\/p>\r\n\r\n<h2 class=\"sec\" id=\"faq\">FAQ<\/h2>\r\n<details open><summary>Why must TPE be underwater?<\/summary><p>TPE and TPU stay tacky after the die. On strands they glue to guides and to each other; cut underwater, the surface sets instantly and pellets leave as individual beads.<\/p><\/details><details><summary>What happens on an unplanned stop?<\/summary><p>Without the start-up sequence, melt in the die holes freezes and blocks them. Our lines divert scrap and keep water circulating during stops, so a restart takes minutes, not hours.<\/p><\/details><details><summary>Can one underwater line serve EPP and TPU?<\/summary><p>Yes with a changeover kit: die plate, knife speed and water temperature are the change items. Plan half a day including purging.<\/p><\/details>\r\n\r\n<div class=\"method\"><h2 id=\"rm-s7\">Where these numbers come from<\/h2>\r\n<p>Output ranges, pellet shapes and watch-outs come from Kerke commissioning records and the pelletizing systems parameter table. Where a catalogue value and a trial value disagree, the trial value is the one we quote.<\/p>\r\n<p>Reviewed by the Kerke process team, Nanjing. Page updated 11 November 2026.<\/p><\/div>\r\n\r\n<div class=\"related\"><h2 id=\"rm-s8\">Related<\/h2><div class=\"rel-grid\"><a class=\"rel\" href=\"\/machines\/pelletizing-systems\/\"><span>Machine<\/span>Pelletizing systems \u2014 7 methods<\/a><a class=\"rel\" href=\"\/applications\/tpe-tpu-tpr-pelletizing\/\"><span>Application<\/span>TPE \/ TPU \/ TPR Pelletizing<\/a><a class=\"rel\" href=\"\/applications\/hot-melt-adhesive-compounding\/\"><span>Application<\/span>Hot Melt Adhesive Compounding<\/a><a class=\"rel\" href=\"\/machines\/pelletizing-systems\/\"><span>Machine<\/span>Pelletizing systems \u2014 7 methods compared<\/a><\/div><\/div>\r\n<div class=\"cta\"><div><b>Not sure which pelletizing method fits 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>\r\n<div class=\"acts\"><a href=\"\/get-a-quote\/\">Get a quote<\/a>\r\n<a class=\"alt\" href=\"\/get-a-quote\/#trial\">Send material for trial<\/a><\/div><\/div>\r\n<\/main>\r\n<aside><h5>On this page<\/h5><ol><li><a href=\"#answer\">Quick answer<\/a><\/li><li><a href=\"#how\">How it works<\/a><\/li><li><a href=\"#fit\">Where it wins<\/a><\/li><li><a href=\"#specs\">Reference data<\/a><\/li><li><a href=\"#faq\">FAQ<\/a><\/li><\/ol>\r\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>\r\n<a class=\"btn\" href=\"\/get-a-quote\/\">Request a quote<\/a>\r\n<a class=\"btn ghost\" href=\"\/machines\/pelletizing-systems\/\">All 7 pelletizing methods<\/a><\/div><\/aside><\/div><\/div>\r\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>\r\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@graph\": [{\"@type\": \"Product\", \"name\": \"Underwater Hot Die-Face Pelletizing \u2014 Kerke\", \"brand\": {\"@type\": \"Brand\", \"name\": \"Kerke\"}, \"description\": \"Knives cutting inside a pressurized water chamber \u2014 perfectly round, dense pellets for TPE\/TPU, hot melt adhesives, EPP beads and every product where shape is part of the spec.\", \"category\": \"Pelletizing systems\", \"additionalProperty\": [{\"@type\": \"PropertyValue\", \"name\": \"Output\", \"value\": \"200\u20132,000 kg\/h\"}, {\"@type\": \"PropertyValue\", \"name\": \"Pellet shape\", \"value\": \"Round, dense\"}]}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Why must TPE be underwater?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"TPE and TPU stay tacky after the die. 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Plan half a day including purging.\"}}]}, {\"@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\", \"item\": \"https:\/\/www.kerkepm.com\/machines\/pelletizing-systems\/\"}, {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Underwater Hot Die-Face Pelletizing\"}]}]}<\/script>\r\n<div class=\"wrap\"><section class=\"k3-more\" id=\"rm-more\"><h2>Underwater Hot Die-Face Pelletizing \u2014 the short version<\/h2><p>Underwater cutting delivers spherical, dust-free pellets for TPE, TPU, hot-melt adhesives and EPP beads \u2014 the premium choice when pellet appearance and flowability matter, at the cost of a more demanding start-up procedure.<\/p><p class=\"k3-rel\"><b>Related on this site:<\/b> <a href=\"\/machines\/pelletizing-systems\/\">Pelletizing systems (all 7 methods)<\/a> \u00b7 <a href=\"\/knowledge\/pelletizing-methods-compared\/\">Pelletizing methods compared<\/a> \u00b7 <a href=\"\/get-a-quote\/\">free extrusion line quotation<\/a><\/p><\/section><\/div>\r\n<\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Home\/Machines\/Pelletizing systems\/Underwater Hot Die-Face Pelletizing Pelletizing \u00b7 Underwater Hot Die-Face Pelletizing Underwater Hot Die-Face Pelletizing: How Kerke Builds It Knives cutting inside a pressurized water chamber \u2014 perfectly round, dense pellets for TPE\/TPU, hot melt adhesives, EPP beads and every product where shape is part of the spec. Updated 11 November 2026Scope TPE\/TPU \u00b7 hot [&#8230;]\n","protected":false},"author":0,"featured_media":0,"parent":19,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"application":[],"app_group":[],"class_list":["post-2787","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/pages\/2787","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=2787"}],"version-history":[{"count":0,"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/pages\/2787\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/pages\/19"}],"wp:attachment":[{"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/media?parent=2787"}],"wp:term":[{"taxonomy":"application","embeddable":true,"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/application?post=2787"},{"taxonomy":"app_group","embeddable":true,"href":"https:\/\/kerkepm.com\/es\/wp-json\/wp\/v2\/app_group?post=2787"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}