{"id":7728,"date":"2025-09-03T09:00:00","date_gmt":"2025-09-03T08:00:00","guid":{"rendered":"https:\/\/uplastech.com\/extrusion-line-start-up-shutdown\/"},"modified":"2025-09-03T09:00:00","modified_gmt":"2025-09-03T08:00:00","slug":"extrusion-line-start-up-shutdown","status":"publish","type":"post","link":"https:\/\/uplastech.com\/pl\/extrusion-line-start-up-shutdown\/","title":{"rendered":"Extrusion Line Start-Up and Shutdown: The Sequence That Saves Scrap"},"content":{"rendered":"<style>\n.upl-blog{font-size:17px;line-height:1.78;color:#1f2937}\n.upl-blog p{margin:0 0 18px}\n.upl-blog h2{font-size:26px;line-height:1.3;color:#0b2b33;margin:46px 0 14px;font-weight:700;letter-spacing:-.015em}\n.upl-blog h3{font-size:19.5px;color:#0d3b47;margin:28px 0 10px;font-weight:700}\n.upl-blog ul,.upl-blog ol{margin:0 0 20px;padding-left:22px}\n.upl-blog li{margin:0 0 9px}\n.upl-blog figure{margin:0 0 34px}\n.upl-blog figure img{width:100%;height:auto;display:block;border-radius:10px}\n.upl-blog figcaption{font-size:13px;color:#6b7280;margin-top:10px;line-height:1.5}\n.upl-blog .toc{background:none;border:0;border-radius:0;padding:0;margin:0 0 34px}\n.upl-blog .toc .lwptoc{margin:0}\n.upl-blog .toc h4{margin:0 0 10px;font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#0d5563}\n.upl-blog .toc ol{margin:0;padding-left:18px;font-size:14.5px}\n.upl-blog .toc li{margin-bottom:6px}\n.upl-blog table{width:100%;border-collapse:collapse;font-size:14.5px;margin:0 0 10px}\n.upl-blog th{background:#0d3b47;color:#fff;text-align:left;padding:11px 13px;font-weight:600;font-size:13.5px;border:0}\n.upl-blog td{padding:11px 13px;border:0;border-bottom:1px solid #e8ebed;vertical-align:top}\n.upl-blog tbody tr:nth-child(even){background:#fafbfc}\n.upl-blog .tablecap{font-size:12.5px;color:#6b7280;margin:0 0 30px}\n.upl-blog .myth{background:#fff8ef;border:1px solid #f6ddbd;border-radius:8px;padding:16px 20px;margin:0 0 26px;font-size:15.5px}\n.upl-blog .myth b{color:#a85c10}\n.upl-blog .callout{background:#f2f8f9;border-radius:8px;padding:18px 22px;margin:0 0 26px;font-size:15.5px;border-left:3px solid #14707f}\n.upl-blog .faq h3{border-top:1px solid #eceff1;padding-top:22px;margin-top:0;font-size:18px}\n.upl-blog .faq h3:first-of-type{border-top:0;padding-top:0}\n.upl-blog .cta{background:linear-gradient(135deg,#0b2b33,#0d5563);color:#fff;border-radius:12px;padding:34px;margin:48px 0 30px}\n.upl-blog .cta h2,.upl-blog .cta .cta-h{color:#fff;margin:0 0 10px;font-size:24px;font-weight:700;line-height:1.3}\n.upl-blog .cta p{color:#c9dee3;margin:0 0 20px;font-size:16px}\n.upl-blog .btn{display:inline-block;background:#e07a1f;color:#fff;text-decoration:none;font-weight:700;padding:13px 26px;border-radius:8px;font-size:15.5px}\n.upl-blog .rel{border-top:1px solid #e8ebed;margin-top:40px;padding-top:26px}\n.upl-blog .rel h4{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#6b7280;margin:0 0 14px}\n.upl-blog .rel ul{list-style:none;padding:0;margin:0}\n.upl-blog .rel li{padding:11px 0;border-bottom:1px dashed #e8ebed}\n.upl-blog .rel a{text-decoration:none;font-weight:600;font-size:15.5px}\n@media(max-width:640px){.upl-blog h2{font-size:22px}.upl-blog table{font-size:13px}.upl-blog .cta{padding:24px}}\n\/* \u5355\u7bc7\u9875\u9690\u85cf WhatsApp \u81ea\u52a8\u5c55\u5f00\u7684\u95ee\u5019\u5361\uff0c\u53ea\u4fdd\u7559\u5706\u5f62\u6c14\u6ce1\uff0c\u907f\u514d\u906e\u6321\u4fa7\u680f\u8be2\u76d8\u63d0\u4ea4\u6309\u94ae *\/\nbody.single-post .ht_ctc_chat_greetings_box{display:none !important}\n<\/style>\n<div class=\"upl-blog\">\n<figure>\n<img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/uplastech.com\/wp-content\/uploads\/2026\/10\/extrusion-line-start-up-shutdown.jpg\" alt=\"Barrel soak time to reach thermal equilibrium and start-up scrap rate falling as a line reaches steady state\" width=\"1536\" height=\"909\"><figcaption>Every extrusion line makes its worst product in the first hour and its best after the third. The gap between them is almost entirely procedure.<\/figcaption><\/figure>\n<div class=\"toc\"><\/div>\n<h2 id=\"cost\">Why start-up is where the scrap is made<\/h2>\n<p>Ask a plant where its scrap comes from and the answer is usually \"defects\". Look at the numbers and most of it comes from two places: the first hour of a run and the last twenty minutes before a changeover.<\/p>\n<p>The reason is thermal. An extruder is a several-hundred-kilogram mass of steel that has to reach and hold a temperature profile within a few degrees, and the barrel does not reach equilibrium when the controller display says it has. The display reads a thermocouple in a well a few millimetres from the heater; the screw and the melt channel behind it are still catching up.<\/p>\n<div class=\"callout\">\n<p><strong>The soak is not optional.<\/strong> A 60 mm extruder needs 45\u201390 minutes at temperature before the first pellet goes in. Starting early produces product that measures correctly and fails on the next process, because it was extruded at the wrong melt viscosity.<\/p>\n<\/div>\n<h2 id=\"heating\">Heating: the soak time nobody allows<\/h2>\n<p>Heat soak time scales with the square of the barrel diameter, because it is a conduction problem through steel. A small machine settles quickly; a large one does not.<\/p>\n<table>\n<thead>\n<tr>\n<th>Screw diameter<\/th>\n<th>Heat-up to setpoint<\/th>\n<th>Minimum soak after setpoint<\/th>\n<th>Total before feeding<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>25 \u2013 35 mm<\/td>\n<td>20 \u2013 30 min<\/td>\n<td>15 \u2013 20 min<\/td>\n<td>40 \u2013 50 min<\/td>\n<\/tr>\n<tr>\n<td>45 mm<\/td>\n<td>30 \u2013 40 min<\/td>\n<td>25 \u2013 30 min<\/td>\n<td>60 \u2013 70 min<\/td>\n<\/tr>\n<tr>\n<td>60 mm<\/td>\n<td>45 \u2013 60 min<\/td>\n<td>30 \u2013 45 min<\/td>\n<td>80 \u2013 105 min<\/td>\n<\/tr>\n<tr>\n<td>75 mm<\/td>\n<td>60 \u2013 80 min<\/td>\n<td>45 \u2013 60 min<\/td>\n<td>105 \u2013 140 min<\/td>\n<\/tr>\n<tr>\n<td>90 mm<\/td>\n<td>80 \u2013 110 min<\/td>\n<td>60 \u2013 90 min<\/td>\n<td>140 \u2013 200 min<\/td>\n<\/tr>\n<tr>\n<td>120 mm<\/td>\n<td>120 \u2013 150 min<\/td>\n<td>90 \u2013 120 min<\/td>\n<td>210 \u2013 270 min<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 1 \u2014 Heat-up and soak times by screw diameter. The soak column is the one that gets cut when the shift starts late.<\/p>\n<p>Two practices shorten the effective soak. First, set the barrel zones to temperature in the order they will be needed \u2014 feed zone first, then compression, then metering and die \u2014 so the whole barrel is not fighting for heat at once. Second, switch on the die and adaptor heaters earlier than the barrel, because the die is the largest mass and the slowest to stabilise.<\/p>\n<p>What goes wrong without a soak is subtle. The melt in contact with the screw flights is hotter than the melt in the channel centre, because the steel is still absorbing heat. The result is a viscosity profile that varies across the flow, which shows up as die lines, inconsistent gloss and dimensions that drift for the first hour. None of it looks like a temperature problem at the time.<\/p>\n<h2 id=\"alignment\">Alignment before the first pellet<\/h2>\n<p>While the machine is cold and empty is the only convenient time to check alignment. Once it is running and hot, everything has moved and the measurement is meaningless.<\/p>\n<table>\n<thead>\n<tr>\n<th>Check<\/th>\n<th>Tolerance<\/th>\n<th>What it prevents<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Die to barrel centreline<\/td>\n<td>0.1 mm<\/td>\n<td>Wall thickness variation, die lines<\/td>\n<\/tr>\n<tr>\n<td>Sizing sleeve to die centre<\/td>\n<td>0.1 mm<\/td>\n<td>Ovality, uneven vacuum pull<\/td>\n<\/tr>\n<tr>\n<td>Tank to die height and centre<\/td>\n<td>0.5 mm<\/td>\n<td>Bend, sag before the water<\/td>\n<\/tr>\n<tr>\n<td>Haul-off to tank centre<\/td>\n<td>1 mm<\/td>\n<td>Twist, uneven belt pressure<\/td>\n<\/tr>\n<tr>\n<td>Cutter square to the line<\/td>\n<td>0.2 mm over 100 mm<\/td>\n<td>Angled cuts, length error<\/td>\n<\/tr>\n<tr>\n<td>Screw to barrel clearance<\/td>\n<td>Per manufacturer<\/td>\n<td>Wear, output loss, surging<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 2 \u2014 Alignment checks. All of them are cheap on a cold machine and expensive to discover from the product.<\/p>\n<p>The die-to-barrel check is the one that gets skipped, because the die was on the machine last week and \"nothing changed\". Something always changes \u2014 a die cleaned and reassembled, a different adaptor, a new screen pack housing. Ten minutes with a dial indicator saves an hour of chasing wall variation.<\/p>\n<h2 id=\"startup\">Bringing the line up<\/h2>\n<p>The start-up sequence matters because each step establishes a condition the next one depends on. Rushing to full line speed before the die is thermally stable produces scrap that has to be pulled back through the whole downstream anyway.<\/p>\n<table>\n<thead>\n<tr>\n<th>Krok<\/th>\n<th>Dzia\u0142anie<\/th>\n<th>Target<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>Heat all zones including die and adaptor, in order<\/td>\n<td>Setpoint on every zone<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>Soak at setpoint, no screw rotation<\/td>\n<td>Per Table 1<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>Check alignment and die bolts hot<\/td>\n<td>Per Table 2<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>Start screw at low speed, feed resin slowly<\/td>\n<td>20 \u2013 30% of production rpm<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>Purge until the melt is clean and uniform<\/td>\n<td>No unmelt, no colour streaks<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>Establish the profile through the die by hand<\/td>\n<td>Full section, no tearing<\/td>\n<\/tr>\n<tr>\n<td>7<\/td>\n<td>Thread through sizing, tank, haul-off at low speed<\/td>\n<td>Stable, no break<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>Ramp line speed in 20% steps, checking dimensions<\/td>\n<td>Within tolerance at each step<\/td>\n<\/tr>\n<tr>\n<td>9<\/td>\n<td>Confirm steady state, then start the clock on saleable product<\/td>\n<td>Per Table 4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 3 \u2014 The nine-step start-up. Step 8 is where most of the scrap is generated, because the line is ramped faster than the cooling can follow.<\/p>\n<p>The single most useful habit is to ramp in steps and check dimensions at each one. A line brought up from 2 m\/min to 12 m\/min in one move will produce 200 m of out-of-tolerance product before anyone notices, because the cooling length that worked at 2 m\/min is too short at 12. Ramping in 20% steps with a measurement at each costs ten minutes and saves the 200 m.<\/p>\n<h2 id=\"steady\">Reaching steady state<\/h2>\n<p>Steady state is not when the product looks right. It is when the variables that affect the product have stopped moving. Five indicators tell you.<\/p>\n<table>\n<thead>\n<tr>\n<th>Indicator<\/th>\n<th>Steady when<\/th>\n<th>Why it matters<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Head pressure<\/td>\n<td>Varies less than \u00b12% over 10 minutes<\/td>\n<td>Direct read on melt consistency<\/td>\n<\/tr>\n<tr>\n<td>Temperatura topnienia<\/td>\n<td>Within \u00b12 \u00b0C of target, stable<\/td>\n<td>Viscosity and cooling rate<\/td>\n<\/tr>\n<tr>\n<td>Motor load<\/td>\n<td>Stable at constant screw speed<\/td>\n<td>Screw and barrel condition<\/td>\n<\/tr>\n<tr>\n<td>Wymiary<\/td>\n<td>Within tolerance for 20 consecutive measurements<\/td>\n<td>The actual product requirement<\/td>\n<\/tr>\n<tr>\n<td>Cooling water out temperature<\/td>\n<td>Stable, not climbing<\/td>\n<td>The tank has reached its heat load<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 4 \u2014 Steady state indicators. Head pressure is the earliest and most sensitive; dimensions are the last to settle.<\/p>\n<p>In practice a profile line reaches dimensional steady state 30\u201360 minutes after the last speed change. On heavy sections it takes longer, because the thermal mass of the product itself is part of the system \u2014 a 10 mm rod needs its whole length in the tank to be at equilibrium before the cutter sees consistent material.<\/p>\n<h2 id=\"shutdown\">Shutdown: purge, park or hold<\/h2>\n<p>How a line is shut down determines how it starts up next time, and the difference is measured in hours.<\/p>\n<table>\n<thead>\n<tr>\n<th>Option<\/th>\n<th>When to use<\/th>\n<th>Koszt<\/th>\n<th>Restart time<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Hold at temperature<\/td>\n<td>Break under 2 hours, stable resin<\/td>\n<td>Energy only<\/td>\n<td>15 \u2013 30 min<\/td>\n<\/tr>\n<tr>\n<td>Hold with screw at low rpm<\/td>\n<td>Break of 2 \u2013 8 hours<\/td>\n<td>Energy plus some material<\/td>\n<td>30 \u2013 45 min<\/td>\n<\/tr>\n<tr>\n<td>Purge with cleaning compound<\/td>\n<td>Overnight, or heat-sensitive resin<\/td>\n<td>Compound plus labour<\/td>\n<td>60 \u2013 90 min<\/td>\n<\/tr>\n<tr>\n<td>Purge and cool down<\/td>\n<td>Weekend, or long idle<\/td>\n<td>Full heat cycle<\/td>\n<td>2 \u2013 4 hours<\/td>\n<\/tr>\n<tr>\n<td>Strip the die<\/td>\n<td>Colour change or resin change<\/td>\n<td>Labour, gaskets<\/td>\n<td>3 \u2013 5 hours<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 5 \u2014 Shutdown options. Holding at temperature is cheapest for short breaks and the most expensive mistake for a weekend.<\/p>\n<p>PVC is the material that punishes the wrong choice hardest. Rigid PVC at 190 \u00b0C degrades within about 20\u201330 minutes of standing still, and the degradation is autocatalytic \u2014 once it starts it accelerates. A PVC line left at temperature over lunch without screw rotation will need the die stripped. Hold with the screw turning slowly, or purge.<\/p>\n<p>Polyolefins are forgiving by comparison and can be held at temperature overnight. But even PP will oxidise over a long hold, and the first material out will be discoloured and low in molecular weight. Purge a barrel volume before starting production.<\/p>\n<h2 id=\"restart\">Restart after a weekend<\/h2>\n<p>A cold restart is a different procedure from a warm one, and treating it as the same is the reason Monday morning produces so much scrap.<\/p>\n<p>Bring the machine up slowly. Heating a cold barrel at full power creates a large temperature gradient between the heater band and the inner wall, and on a worn barrel that gradient can crack the liner. Most controllers have a slow-start or soft-start mode; use it. Then follow the full soak from Table 1 \u2014 a machine that has been cold for two days needs the full time, not a discounted version of it.<\/p>\n<p>Check the die bolts and the adaptor flange before feeding. Thermal cycling loosens them, and a leaking adaptor flange discovered at production temperature means shutting down again. Torque them cold, then re-check hot.<\/p>\n<h2 id=\"checklist\">The checklist<\/h2>\n<p>A start-up checklist is worth more than any single process improvement, because it converts knowledge held by two experienced operators into a procedure anyone can follow. Keep it to one page and make it specific to the machine, not generic.<\/p>\n<table>\n<thead>\n<tr>\n<th>Section<\/th>\n<th>Items<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Before heating<\/td>\n<td>Resin dried and correct, screens clean, die bolts torqued, alignment checked<\/td>\n<\/tr>\n<tr>\n<td>Ogrzewanie<\/td>\n<td>Zones in order, die first, soak logged with a start and end time<\/td>\n<\/tr>\n<tr>\n<td>First material<\/td>\n<td>Screw at low rpm, purge volume recorded, melt inspected<\/td>\n<\/tr>\n<tr>\n<td>Threading<\/td>\n<td>Profile by hand, vacuum on, haul-off at minimum<\/td>\n<\/tr>\n<tr>\n<td>Ramp<\/td>\n<td>20% steps, dimension check at each<\/td>\n<\/tr>\n<tr>\n<td>Steady state<\/td>\n<td>Five indicators logged, then production clock starts<\/td>\n<\/tr>\n<tr>\n<td>Shutdown<\/td>\n<td>Option chosen per Table 5, purge volume recorded<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 6 \u2014 A one-page start-up and shutdown checklist. Logging the soak start and end time alone removes most of the first-hour variation.<\/p>\n<p>The logging matters as much as the checklist. A plant that records soak time, purge volume and the time to steady state for every run can see which machines and which operators are losing an hour, and can fix it. Without the record, every shift believes it is doing the same thing.<\/p>\n<div class=\"faq\">\n<h3>How long should an extruder soak before starting?<\/h3>\n<p>45\u201390 minutes at temperature after the display reaches setpoint for a 60 mm machine, longer for larger barrels. Heat soak scales with the square of the screw diameter. Small machines settle in 40 minutes, 120 mm machines need over three hours.<\/p>\n<h3>Why is my product out of tolerance for the first hour?<\/h3>\n<p>The barrel and die have not reached thermal equilibrium, so the melt viscosity is drifting. The controller reads a thermocouple near the heater, not the melt channel. Allow the full soak and ramp line speed in steps.<\/p>\n<h3>Can I leave the machine at temperature overnight?<\/h3>\n<p>For polyolefins, usually yes, with the screw turning slowly. For PVC, no \u2014 rigid PVC degrades within 20\u201330 minutes of standing still and the degradation accelerates. Purge or strip the die.<\/p>\n<h3>What is the best shutdown for a weekend?<\/h3>\n<p>Purge with a cleaning compound and cool down, or strip the die if the resin is heat sensitive. Holding at temperature for two days costs energy, oxidises the resin and risks degradation in dead spots.<\/p>\n<h3>Why does head pressure take so long to stabilise?<\/h3>\n<p>Because it depends on melt temperature, which depends on the whole barrel reaching equilibrium, not just the zone the thermocouple sits in. Head pressure is the most sensitive indicator of thermal stability and the earliest to show a problem.<\/p>\n<h3>Do I need to purge between colours?<\/h3>\n<p>Yes, and the volume depends on the direction. Dark to light needs two to three barrel volumes plus a die clean. Light to dark needs much less. See the colour changeover procedure for the sequence.<\/p>\n<h3>How much material does a start-up waste?<\/h3>\n<p>On a profile line, typically 20\u201360 kg of resin plus 50\u2013200 m of product, depending on the section and the discipline of the procedure. A logged checklist usually halves it within a month.<\/p>\n<h3>Should the die be heated before the barrel?<\/h3>\n<p>Yes. The die and adaptor are the largest thermal mass and the slowest to stabilise. Heating them first means they are ready when the barrel is, instead of adding another hour to the start-up.<\/p>\n<\/div>\n<div class=\"cta\">\n<p class=\"cta-h\">Losing product at every start-up?<\/p>\n<p>Tell us the machine, the resin and your current start-up procedure. We will tell you where the scrap is coming from \u2014 soak time, ramp profile or die stability \u2014 and what a realistic first-hour target looks like.<\/p>\n<p><a class=\"btn\" href=\"https:\/\/uplastech.com\/pl\/rozwiazania-w-zakresie-wytlaczania-tworzyw-sztucznych\/\">Talk to an extrusion engineer<\/a>\n<\/div>\n<div class=\"rel\">\n<h4>Continue reading<\/h4>\n<ul>\n<li><a href=\"https:\/\/uplastech.com\/pl\/extrusion-output-calculation\/\">Extrusion Output Calculation: Throughput, Screw Speed and Line Speed<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/pl\/extruder-screw-design\/\">Extruder Screw Design: Zones, Compression Ratio and Wear<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/pl\/colour-changeover-in-extrusion\/\">Colour Changeover in Extrusion: Purge Compounds, Sequence and Downtime<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/pl\/melt-pump-screen-changer-pressure-stability\/\">Melt Pump and Screen Changer: Why Pressure Stability Beats Throughput<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/pl\/wady-wytlaczania-tworzyw-sztucznych\/\">Plastic Extrusion Defects: 12 Problems, Causes and Fixes<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Most start-up scrap is made in the first hour, and most of it is avoidable. Heat soak, purge, string-up, steady state, and why shutdown matters just as much.<\/p>","protected":false},"author":1,"featured_media":7720,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Extrusion Line Start-Up and Shutdown: The Sequence That Save","_seopress_titles_desc":"Most start-up scrap is made in the first hour, and most of it is avoidable. 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