{"id":18689,"date":"2026-04-26T10:32:01","date_gmt":"2026-04-26T08:32:01","guid":{"rendered":"https:\/\/www.energycle.com\/pet-flake-dryer-guide\/"},"modified":"2026-04-26T10:32:02","modified_gmt":"2026-04-26T08:32:02","slug":"pet-flake-susilni-vodic","status":"publish","type":"post","link":"https:\/\/www.energycle.com\/hr\/pet-flake-susilni-vodic\/","title":{"rendered":"PET Lje\u0161\u0107e Su\u0161ilica: Kompletni vodi\u010d za sustave su\u0161enja PET i kontrolu vla\u017enosti"},"content":{"rendered":"<p>A <strong>PET flake dryer<\/strong> reduces moisture in washed PET bottle flakes from 30\u201340% (post-wash) to the level your downstream process requires \u2014 typically 0.005% (50 ppm) for bottle-to-bottle, 0.03% (300 ppm) for fiber, or 0.05% (500 ppm) for low-grade strapping. Hit the wrong moisture target and you get hydrolytic IV degradation, hazy pellets, or extruder bubbles. This guide covers why PET drying is uniquely demanding, the four-stage drying process, equipment options, line configurations, and a selection framework for sizing your <a href=\"https:\/\/www.energycle.com\/drying-systems\/\">PET drying system<\/a>.<\/p>\n<h2>Why PET Drying Is Different From Other Plastics<\/h2>\n<p>PET behaves very differently from HDPE, PP, or PVC during drying \u2014 three properties make it harder to handle:<\/p>\n<ul>\n<li><strong>Hygroscopicity<\/strong>: PET absorbs 0.4\u20130.5% moisture from ambient air at 50% RH. Even after thermal drying, PET reabsorbs water within hours of exposure. HDPE absorbs less than 0.01% \u2014 a fundamental difference.<\/li>\n<li><strong>Hydrolysis<\/strong>: At extrusion temperatures (270\u2013290\u00b0C) with moisture above 50 ppm, PET undergoes hydrolytic chain scission. Intrinsic viscosity (IV) drops 0.05\u20130.10 dL\/g per pass \u2014 the polymer becomes weaker, hazier, and unsuitable for bottle-grade applications.<\/li>\n<li><strong>Crystallization sensitivity<\/strong>: Amorphous PET softens above 75\u00b0C and sticks together. Drying temperature must be controlled around the glass transition point \u2014 too hot and flakes agglomerate, too cold and drying takes hours.<\/li>\n<\/ul>\n<p>These three properties drive the standard PET flake drying sequence: <strong>mechanical dewatering \u2192 thermal flash drying \u2192 crystallization \u2192 optional desiccant drying for pellets<\/strong>. Skipping any stage either wastes energy or produces off-spec output.<\/p>\n<h2>Moisture Targets by End Application<\/h2>\n<p>The right PET dryer setup depends entirely on your end product. Over-drying wastes energy; under-drying destroys the polymer.<\/p>\n<table>\n<thead>\n<tr>\n<th>End Application<\/th>\n<th>Target Moisture<\/th>\n<th>Required Drying Stages<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Bottle-to-bottle (food-contact rPET)<\/strong><\/td>\n<td>\u226450 ppm (0.005%)<\/td>\n<td>Centrifugal + thermal + crystallizer + desiccant pellet dryer<\/td>\n<\/tr>\n<tr>\n<td><strong>Sheet \/ thermoforming (rPET trays)<\/strong><\/td>\n<td>\u2264100 ppm (0.01%)<\/td>\n<td>Centrifugal + thermal + crystallizer<\/td>\n<\/tr>\n<tr>\n<td><strong>Fiber spinning (polyester staple)<\/strong><\/td>\n<td>\u2264300 ppm (0.03%)<\/td>\n<td>Centrifugal + thermal dryer<\/td>\n<\/tr>\n<tr>\n<td><strong>Strapping band<\/strong><\/td>\n<td>\u2264500 ppm (0.05%)<\/td>\n<td>Centrifugal + short thermal stage<\/td>\n<\/tr>\n<tr>\n<td><strong>Low-grade flake export<\/strong><\/td>\n<td>\u22641% (10,000 ppm)<\/td>\n<td>Centrifugal dewatering only<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote><p><strong>Key Takeaway:<\/strong> 50 ppm vs 300 ppm sounds like a small number, but the equipment and energy difference is roughly 3\u20134\u00d7 capital cost. Specify your end application <em>before<\/em> sizing the dryer line, not after.<\/p><\/blockquote>\n<h2>The 4-Stage PET Flake Drying Process<\/h2>\n<h3>Stage 1: Mechanical Dewatering (Centrifugal)<\/h3>\n<p>Washed PET flakes leave the friction washer or float-sink tank carrying 30\u201340% surface moisture. A <a href=\"https:\/\/www.energycle.com\/drying-systems\/centrifugal-dewatering-machine-plastic-flakes\/\">centrifugal dewatering machine<\/a> spins the flakes at 1,200\u20131,500 RPM inside a perforated screen, throwing free water out radially. Outlet moisture: 2\u20134% in a single pass.<\/p>\n<p>For PET specifically, a <a href=\"https:\/\/www.energycle.com\/horizontal-vs-vertical-centrifugal-dewatering-machine\/\">horizontal centrifugal dewatering machine<\/a> is preferred above 1 ton\/h \u2014 longer residence time removes label fragments and fines along with water, and the lower rotor speed (800\u20131,200 RPM) prevents PET flake breakage. Below 800 kg\/h, a vertical centrifugal unit is sufficient.<\/p>\n<p>This stage is the cheapest water-removal step. Centrifugal dewatering uses ~30\u201355 kWh per ton; thermal evaporation of the same water mass uses 250+ kWh per ton. Always run flakes through centrifugal dewatering before any thermal drying \u2014 see our <a href=\"https:\/\/www.energycle.com\/comparing-energy-input-mechanical-centrifugal-dryers-vs-air-drying\/\">centrifugal vs air drying energy comparison<\/a> for the calculations.<\/p>\n<h3>Stage 2: Thermal Flash Drying (Hot Air Pipeline)<\/h3>\n<p>After centrifugal dewatering, flakes still carry 2\u20134% surface moisture \u2014 too wet for direct extrusion or further processing. A <a href=\"https:\/\/www.energycle.com\/drying-systems\/pipeline-hot-air-drying-system\/\">pipeline hot air drying system<\/a> conveys the flakes pneumatically through a long heated duct (typically 15\u201330 m), where 130\u2013150\u00b0C air evaporates remaining surface water in 30\u201360 seconds.<\/p>\n<p>Output moisture after this stage: 0.3\u20130.8%. Crucially, the air temperature must stay below 160\u00b0C \u2014 at 165\u00b0C+, amorphous PET begins to soften and flakes bond together, fouling the pipe walls. Modern systems use PID temperature control with \u00b12\u00b0C tolerance.<\/p>\n<h3>Stage 3: Crystallization (Required for Bottle-to-Bottle and Sheet Grades)<\/h3>\n<p>Amorphous PET flakes are sticky and hygroscopic \u2014 they reabsorb moisture quickly and clump in dryers. Crystallization at 130\u2013160\u00b0C for 20\u201340 minutes converts amorphous PET into a crystalline structure that is non-tacky, free-flowing, and dries faster in the next stage.<\/p>\n<p>Crystallizers use either fluidized-bed or paddle-mixer designs. Output moisture is reduced to 0.05\u20130.10%, and (more importantly) the crystallized flakes can be heated to 170\u2013180\u00b0C in the next stage without sticking.<\/p>\n<p>For low-grade applications (strapping, low-spec fiber), the crystallizer can be skipped \u2014 but bottle-to-bottle and sheet grades require it.<\/p>\n<h3>Stage 4: Desiccant Pellet Dryer (Bottle-to-Bottle Only)<\/h3>\n<p>To reach the 50 ppm moisture required for food-contact bottle-grade rPET, a desiccant dryer (also called a dehumidifying dryer) operates after pelletizing. Dew-point air at -40\u00b0C is recirculated through the pellet hopper at 170\u2013180\u00b0C for 4\u20136 hours, pulling residual moisture out via vapor pressure differential.<\/p>\n<p>Without this stage, food-grade PET cannot be produced regardless of upstream drying quality. This is why bottle-to-bottle lines have 4 drying stages, while strapping lines have only 1\u20132.<\/p>\n<h2>Equipment Comparison: Bottle Flake Dryer Options<\/h2>\n<table>\n<thead>\n<tr>\n<th>Equipment Type<\/th>\n<th>Outlet Moisture<\/th>\n<th>Throughput<\/th>\n<th>Energy Use<\/th>\n<th>Capital Cost (USD)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Vertical centrifugal dewatering<\/td>\n<td>3\u20135%<\/td>\n<td>200\u20131,000 kg\/h<\/td>\n<td>30\u201345 kWh\/ton<\/td>\n<td>$8,000\u2013$18,000<\/td>\n<\/tr>\n<tr>\n<td>Horizontal centrifugal dewatering<\/td>\n<td>2\u20134%<\/td>\n<td>800\u20133,500 kg\/h<\/td>\n<td>25\u201340 kWh\/ton<\/td>\n<td>$15,000\u2013$45,000<\/td>\n<\/tr>\n<tr>\n<td>Pipeline hot air dryer<\/td>\n<td>0.3\u20130.8%<\/td>\n<td>500\u20133,000 kg\/h<\/td>\n<td>120\u2013180 kWh\/ton<\/td>\n<td>$25,000\u2013$80,000<\/td>\n<\/tr>\n<tr>\n<td>Crystallizer (fluidized bed)<\/td>\n<td>0.05\u20130.10%<\/td>\n<td>500\u20132,000 kg\/h<\/td>\n<td>180\u2013250 kWh\/ton<\/td>\n<td>$60,000\u2013$180,000<\/td>\n<\/tr>\n<tr>\n<td>Desiccant pellet dryer<\/td>\n<td>\u226450 ppm<\/td>\n<td>250\u20132,500 kg\/h<\/td>\n<td>200\u2013400 kWh\/ton<\/td>\n<td>$30,000\u2013$120,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For a complete 1 ton\/h PET bottle-to-bottle line, drying equipment alone runs $130,000\u2013$300,000 \u2014 typically 25\u201335% of the total line cost. For a strapping line, the same throughput drying section runs $25,000\u2013$60,000.<\/p>\n<h2>PET Drying Line Configurations<\/h2>\n<h3>Small PET Line (300\u2013500 kg\/h, Strapping or Fiber)<\/h3>\n<p>Vertical centrifugal dewatering machine (22\u201330 kW) \u2192 optional pipeline hot air dryer (50\u201380 kW heater + 7.5 kW blower). Total drying-section investment: $30,000\u2013$60,000. Suitable for fiber recycling, strapping, and export-grade flake markets. Final moisture: 0.5\u20131%.<\/p>\n<h3>Medium PET Line (1,000\u20131,500 kg\/h, Sheet or Fiber)<\/h3>\n<p>Horizontal centrifugal dewatering machine (45\u201355 kW) \u2192 pipeline hot air dryer (150\u2013200 kW heater) \u2192 optional crystallizer for sheet grade. Total drying section: $80,000\u2013$180,000. The standard configuration for most PET reclaimers serving fiber and sheet markets. Final moisture: 0.05\u20130.3%.<\/p>\n<h3>Large PET Line (2,000\u20133,000 kg\/h, Bottle-to-Bottle Capable)<\/h3>\n<p>Horizontal centrifugal dewatering (75\u201390 kW) \u2192 pipeline hot air dryer (250\u2013300 kW) \u2192 crystallizer (180 kW) \u2192 desiccant dryer at pellet stage (after the <a href=\"https:\/\/www.energycle.com\/plastic-pelletizers\/pet-bottle-flake-single-screw-pelletizer\/\">PET flake pelletizer<\/a>). Total drying-section investment: $200,000\u2013$400,000. The full bottle-to-bottle setup required for food-grade rPET production. Final moisture in pellet: \u226450 ppm.<\/p>\n<p>For complete line economics, see our <a href=\"https:\/\/www.energycle.com\/pet-recycling-machine-price-guide-2026\/\">PET recycling machine price guide<\/a> and <a href=\"https:\/\/www.energycle.com\/500-kg-h-pet-bottle-recycling-washing-line-guide-and-price\/\">500 kg\/h PET washing line guide<\/a>.<\/p>\n<h2>Common PET Drying Problems and Solutions<\/h2>\n<h3>Flakes Sticking in the Hot Air Dryer<\/h3>\n<p>Cause: air temperature above 160\u00b0C is softening amorphous PET. Solution: lower the inlet air temperature to 145\u2013155\u00b0C, verify temperature sensor calibration, and check for hot spots in the heater bank. If sticking persists, install a crystallizer before the high-temperature drying stage.<\/p>\n<h3>Final Moisture Above Target Despite Adequate Drying Time<\/h3>\n<p>Cause: amorphous PET flakes reabsorbing moisture from ambient air during transfer between stages. Solution: minimize residence time in unheated buffers, install moisture barriers (covered conveyors, sealed silos), and store dried flakes only in dehumidified silos with dew-point control.<\/p>\n<h3>IV Drop During Pelletizing<\/h3>\n<p>Cause: residual moisture above 50 ppm during extrusion at 270\u2013290\u00b0C causes hydrolysis. Solution: verify desiccant dryer dew point (must be below -40\u00b0C), check hopper residence time (4\u20136 hours minimum), and install an inline moisture meter at the extruder feed throat. For bottle-to-bottle compliance, see our guide to <a href=\"https:\/\/www.energycle.com\/how-to-achieve-0-8-moisture-and-50ppm-metal-in-recycled-pellets\/\">achieving sub-0.8% moisture and 50 ppm metal in recycled pellets<\/a>.<\/p>\n<h3>Excessive Energy Cost on the Drying Section<\/h3>\n<p>Cause: skipping or undersizing centrifugal dewatering forces the thermal stage to evaporate bulk water \u2014 5\u201310\u00d7 more energy than centrifugal removal. Solution: verify centrifugal outlet moisture (target 2\u20134%), upgrade to a horizontal centrifugal unit if throughput exceeds 1 ton\/h, and consider running two centrifugal units in series before the thermal stage.<\/p>\n<h2>How to Specify a PET Flake Dryer for Your Line<\/h2>\n<h3>Step 1: Lock Your End Application<\/h3>\n<p>Bottle-to-bottle, sheet, fiber, strapping, or export flake \u2014 these require fundamentally different dryer configurations and capital budgets. Decide first; everything else follows.<\/p>\n<h3>Step 2: Calculate Peak Throughput, Not Average<\/h3>\n<p>PET washing lines typically run 6\u20138 hours per shift with 1\u20132 hours of cleanup, batch changes, and CIP. Daily tonnage divided by 24 hours understates the peak throughput by 1.5\u20132\u00d7. Size the dryer for peak feed, not daily average.<\/p>\n<h3>Step 3: Specify Centrifugal Outlet Moisture<\/h3>\n<p>Demand 3\u20134% maximum outlet moisture from the centrifugal stage in writing. This single number determines your thermal stage size \u2014 every additional percentage point of moisture at the centrifugal outlet adds 60\u201380 kWh\/ton of thermal load.<\/p>\n<h3>Step 4: Add Crystallization Only If Required<\/h3>\n<p>Sheet and bottle-to-bottle grades need crystallization. Fiber and strapping grades typically do not. The crystallizer is the most expensive single piece of drying equipment \u2014 only buy it if your end product specification requires it.<\/p>\n<h3>Step 5: Verify Dew-Point Control on Pellet Drying<\/h3>\n<p>If producing bottle-to-bottle pellets, the desiccant dryer must maintain \u2264-40\u00b0C dew point measured at the hopper outlet (not the dryer inlet). Inadequate dew-point control is the most common reason rPET pellets fail food-contact qualification.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<h3>What is a PET flake dryer?<\/h3>\n<p>A PET flake dryer is a system that removes moisture from washed PET bottle flakes \u2014 typically reducing moisture from 30\u201340% (post-wash) down to the target required by the downstream process: 50 ppm for bottle-to-bottle pellets, 300 ppm for fiber, 500 ppm for strapping. Most PET dryer systems combine a centrifugal dewatering machine for bulk water removal with a thermal hot air dryer for final moisture reduction. Bottle-to-bottle grade also requires a crystallizer and desiccant pellet dryer.<\/p>\n<h3>Why does PET need special drying compared to HDPE or PP?<\/h3>\n<p>PET is hygroscopic (absorbs 0.4\u20130.5% moisture from ambient air) and undergoes hydrolytic chain scission at extrusion temperatures if moisture exceeds 50 ppm. HDPE and PP absorb less than 0.01% moisture and do not hydrolyze. As a result, PET requires multiple drying stages with strict moisture control, while HDPE and PP can typically be processed with centrifugal dewatering alone. PET also has a glass transition near 75\u00b0C, so drying temperatures must be controlled to prevent flake agglomeration.<\/p>\n<h3>What moisture level does PET need before extrusion?<\/h3>\n<p>For food-contact bottle-to-bottle rPET pellets, target \u226450 ppm (0.005%) at the extruder feed throat. For sheet grade (thermoforming), \u2264100 ppm. For fiber spinning, \u2264300 ppm. For strapping band, \u2264500 ppm. For non-extrusion uses (export-grade flake), \u22641% is acceptable. Above these thresholds, hydrolytic IV degradation reduces polymer strength, optical clarity, and processability.<\/p>\n<h3>How much does a complete PET drying system cost?<\/h3>\n<p>A small fiber\/strapping PET dryer line (300\u2013500 kg\/h) with centrifugal + thermal stages costs $30,000\u2013$60,000 USD. A medium sheet\/fiber line (1,000\u20131,500 kg\/h) with centrifugal + thermal + optional crystallizer runs $80,000\u2013$180,000. A full bottle-to-bottle line (2,000\u20133,000 kg\/h) with all four stages \u2014 centrifugal + thermal + crystallizer + desiccant pellet dryer \u2014 costs $200,000\u2013$400,000. Drying represents 25\u201335% of total PET recycling line capital cost.<\/p>\n<h3>Can I use a HDPE dryer for PET flakes?<\/h3>\n<p>For bulk water removal (centrifugal stage), yes \u2014 the same machine works on HDPE, PP, and PET rigid flakes. For thermal drying, no. PET requires temperature control below 160\u00b0C in the thermal stage and crystallization for bottle\/sheet grades. HDPE thermal dryers typically run at 80\u2013120\u00b0C with no crystallizer, which is insufficient for PET applications above strapping grade. Use a PET-specific thermal dryer or a multi-purpose system with PET-rated temperature control.<\/p>\n<h3>What is the difference between a PET dryer and a PET crystallizer?<\/h3>\n<p>A PET dryer removes moisture (the goal is low water content). A PET crystallizer converts amorphous PET into crystalline structure (the goal is non-tacky flakes that can withstand high temperatures without sticking). Crystallization happens incidentally during dryers above 130\u00b0C, but a dedicated crystallizer with controlled residence time (20\u201340 minutes at 130\u2013160\u00b0C) is required for bottle-to-bottle and sheet grades. The crystallized PET is then dried to 50 ppm in a separate desiccant dryer.<\/p>\n<h2>Conclusion<\/h2>\n<p>The right PET flake dryer is determined by your end application \u2014 bottle-to-bottle, sheet, fiber, strapping, or export. Specify the application first, then size each of the four drying stages (centrifugal dewatering, thermal flash drying, crystallization, desiccant pellet drying) based on the moisture target. Skip stages your application does not require, but never skip mechanical dewatering \u2014 it is the cheapest water-removal step and dramatically reduces thermal energy demand downstream.<\/p>\n<p>Energycle manufactures complete <a href=\"https:\/\/www.energycle.com\/drying-systems\/\">PET drying systems<\/a> from compact 300 kg\/h fiber-grade lines to 3,000 kg\/h bottle-to-bottle production. <a href=\"https:\/\/www.energycle.com\/contact-us\/\">Contact our engineering team<\/a> with your throughput, end application, and current moisture targets \u2014 we will recommend the stages, equipment sizing, and integration with your <a href=\"https:\/\/www.energycle.com\/pet-bottle-washing-line-guide\/\">PET bottle washing line<\/a> and <a href=\"https:\/\/www.energycle.com\/plastic-pelletizers\/pet-bottle-flake-single-screw-pelletizer\/\">PET pelletizer<\/a>.<\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Article\",\n  \"headline\": \"PET Flake Dryer: Complete Guide to PET Drying Systems & Moisture Control\",\n  \"description\": \"Complete guide to PET flake dryers and PET drying systems for bottle recycling. Compare centrifugal dewatering, hot air dryers, and crystallizers. Moisture targets, energy specs, line configurations, and selection framework for bottle-to-bottle, fiber, sheet, and strapping applications.\",\n  \"url\": \"https:\/\/www.energycle.com\/pet-flake-dryer-guide\/\",\n  \"datePublished\": \"2026-04-26\",\n  \"dateModified\": \"2026-04-26\",\n  \"image\": \"https:\/\/www.energycle.com\/wp-content\/uploads\/pet-flake-dryer-guide.webp\",\n  \"author\": {\n    \"@type\": \"Organization\",\n    \"name\": \"Energycle\",\n    \"url\": \"https:\/\/www.energycle.com\/\"\n  },\n  \"publisher\": {\n    \"@type\": \"Organization\",\n    \"name\": \"Energycle\",\n    \"url\": \"https:\/\/www.energycle.com\/\",\n    \"logo\": {\n      \"@type\": \"ImageObject\",\n      \"url\": \"https:\/\/www.energycle.com\/wp-content\/uploads\/energycle-logo.png\"\n    }\n  }\n}\n<\/script><\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is a PET flake dryer?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A PET flake dryer is a system that removes moisture from washed PET bottle flakes \u2014 typically reducing moisture from 30-40% (post-wash) to the target required by the downstream process: 50 ppm for bottle-to-bottle pellets, 300 ppm for fiber, 500 ppm for strapping. Most PET dryer systems combine a centrifugal dewatering machine for bulk water removal with a thermal hot air dryer. Bottle-to-bottle grade also requires a crystallizer and desiccant pellet dryer.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why does PET need special drying compared to HDPE or PP?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"PET is hygroscopic (absorbs 0.4-0.5% moisture from ambient air) and undergoes hydrolytic chain scission at extrusion temperatures if moisture exceeds 50 ppm. HDPE and PP absorb less than 0.01% moisture and do not hydrolyze. PET requires multiple drying stages with strict moisture control. PET also has a glass transition near 75\u00b0C, requiring drying temperature control to prevent flake agglomeration.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What moisture level does PET need before extrusion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For food-contact bottle-to-bottle rPET pellets: \u226450 ppm. For sheet grade (thermoforming): \u2264100 ppm. For fiber spinning: \u2264300 ppm. For strapping band: \u2264500 ppm. For non-extrusion uses (export-grade flake): \u22641%. Above these thresholds, hydrolytic IV degradation reduces polymer strength and optical clarity.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How much does a complete PET drying system cost?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Small fiber\/strapping line (300-500 kg\/h, centrifugal + thermal): $30,000-$60,000 USD. Medium sheet\/fiber line (1,000-1,500 kg\/h, centrifugal + thermal + optional crystallizer): $80,000-$180,000. Full bottle-to-bottle line (2,000-3,000 kg\/h, all four stages): $200,000-$400,000. Drying represents 25-35% of total PET recycling line capital cost.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use a HDPE dryer for PET flakes?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For bulk water removal (centrifugal stage), yes \u2014 the same machine works on HDPE, PP, and PET rigid flakes. For thermal drying, no. PET requires temperature control below 160\u00b0C and crystallization for bottle\/sheet grades. HDPE thermal dryers typically run at 80-120\u00b0C with no crystallizer, insufficient for PET applications above strapping grade.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a PET dryer and a PET crystallizer?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A PET dryer removes moisture. A PET crystallizer converts amorphous PET into crystalline structure (non-tacky flakes that can withstand high temperatures without sticking). A dedicated crystallizer with controlled residence time (20-40 minutes at 130-160\u00b0C) is required for bottle-to-bottle and sheet grades. The crystallized PET is then dried to 50 ppm in a separate desiccant dryer.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Savr\u0161eni vodi\u010d za su\u0161ilice za PET prstenove i su\u0161inske sustave za recikliranje butelaka. Usporedite centrifugalno odvajanje vode, su\u0161ilice toplim zrakom i kristalizator. Ciljevi vla\u017enosti, specifikacije energije, konfiguracije linija i izborni okvir za aplikacije butelka u butelku, vlakna, plo\u010dice i veznice.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3062,147],"tags":[],"class_list":["post-18689","post","type-post","status-publish","format-standard","hentry","category-buying-guides","category-drying-systems"],"tsf_seo":{"title":"PET Lje\u0161\u0107e Su\u0161ilica: Kompletni vodi\u010d za su\u0161enje PET-a i vla\u017enost","description":"PET prilika za su\u0161ilicu za prstenastu snje\u017enicu: centrifugalno odvajanje vode, termi\u010dko su\u0161enje, kristalizacija. Ciljevi vla\u017enosti za butelja-u-butelju, plo\u010du, vlakno, veznice. Tro\u0161kovi i specifikacije.","robots":"index, follow","canonical":"https:\/\/www.energycle.com\/hr\/pet-flake-susilni-vodic\/","og_title":"PET Flake Dryer: Complete Guide to PET Drying & Moisture","og_description":"PET flake dryer guide: centrifugal dewatering, thermal drying, crystallization. Moisture targets for bottle-to-bottle, sheet, fiber, strapping. 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