{"id":7666,"date":"2025-08-12T09:00:00","date_gmt":"2025-08-12T08:00:00","guid":{"rendered":"https:\/\/uplastech.com\/regrind-recycled-content-extrusion\/"},"modified":"2026-10-28T03:19:27","modified_gmt":"2026-10-28T03:19:27","slug":"regrind-recycled-content-extrusion","status":"publish","type":"post","link":"https:\/\/uplastech.com\/tr\/regrind-recycled-content-extrusion\/","title":{"rendered":"Regrind and Recycled Content in Extrusion: Ratios, Drying and Property Loss"},"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\/regrind-recycled-content-extrusion.jpg\" alt=\"Chart showing tensile strength and impact resistance falling as regrind content increases for PVC, PE and PP\" width=\"1536\" height=\"909\"><figcaption>Property loss with regrind is not linear and it is not the same for every resin. PVC tolerates far more than PP, and impact strength falls long before tensile strength does.<\/figcaption><\/figure>\n<div class=\"toc\"><\/div>\n<h2 id=\"reality\">Regrind is not free material<\/h2>\n<p>Every extrusion line produces scrap \u2014 start-up lumps, off-spec product, trim, purging. Grinding it and feeding it back looks like free money, and on a well-run line it is. On a line that treats regrind as a substitute for virgin resin, it is the beginning of a slow quality decline that nobody can trace.<\/p>\n<p>The reason is that extrusion is a thermal process, and every pass through the extruder adds a heat history. Polymer chains break under heat and shear, and once broken they do not re-form. The result is lower molecular weight, which means lower viscosity, lower impact strength and lower elongation \u2014 while tensile strength and modulus barely move. That is why regrind problems show up as brittleness and surface defects rather than as weak parts.<\/p>\n<div class=\"callout\">\n<p><strong>The number that matters:<\/strong> a single pass through an extruder typically costs 10\u201325% of the material's impact strength, depending on the resin and the processing temperature. Three passes and you are at half. This is why regrind ratio, not regrind presence, is the variable to control.<\/p>\n<\/div>\n<h2 id=\"what-happens\">What actually degrades<\/h2>\n<table>\n<thead>\n<tr>\n<th>M\u00fclkiyet<\/th>\n<th>Effect of regrind<\/th>\n<th>Neden<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Impact strength<\/td>\n<td>Falls fastest, 10\u201325% per pass<\/td>\n<td>Chain scission reduces the entanglement network that absorbs impact<\/td>\n<\/tr>\n<tr>\n<td>Elongation at break<\/td>\n<td>Falls significantly<\/td>\n<td>Same mechanism; shorter chains pull apart sooner<\/td>\n<\/tr>\n<tr>\n<td>Tensile strength<\/td>\n<td>Small change, often 2\u20135%<\/td>\n<td>Strength depends on chain alignment, not only length<\/td>\n<\/tr>\n<tr>\n<td>Modulus \/ stiffness<\/td>\n<td>Essentially unchanged<\/td>\n<td>Governed by the glassy or crystalline phase, not chain length<\/td>\n<\/tr>\n<tr>\n<td>Melt viscosity<\/td>\n<td>Falls<\/td>\n<td>Shorter chains flow more easily; changes die pressure and output<\/td>\n<\/tr>\n<tr>\n<td>Colour<\/td>\n<td>Yellows or darkens<\/td>\n<td>Thermal oxidation; worse with PVC and with high temperatures<\/td>\n<\/tr>\n<tr>\n<td>Surface finish<\/td>\n<td>Degrades, more gels and specks<\/td>\n<td>Crosslinked gel particles and contamination survive grinding<\/td>\n<\/tr>\n<tr>\n<td>Odour<\/td>\n<td>Increases<\/td>\n<td>Volatile decomposition products<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 1 \u2014 What regrind actually changes. The pattern \u2014 impact and elongation down, strength and stiffness unchanged \u2014 is the signature of chain scission.<\/p>\n<p>The gel problem is worth separating. Gels are not degraded polymer; they are crosslinked or highly oxidised particles that do not melt at processing temperature. They come from hot spots in the extruder, from purging, or from contamination. Grinding does not remove them, and they pass through the screen pack if it is too coarse. In film and sheet they appear as visible defects; in profile they appear as surface roughness.<\/p>\n<h2 id=\"ratios\">How much regrind each resin tolerates<\/h2>\n<table>\n<thead>\n<tr>\n<th>Resin<\/th>\n<th>Typical safe ratio<\/th>\n<th>Upper limit<\/th>\n<th>Notlar<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>PVC (rigid)<\/td>\n<td>30 \u2013 50%<\/td>\n<td>70% with care<\/td>\n<td>Very tolerant; but HCl evolution accelerates with heat history<\/td>\n<\/tr>\n<tr>\n<td>PVC (plasticised)<\/td>\n<td>20 \u2013 40%<\/td>\n<td>50%<\/td>\n<td>Plasticiser loss with each pass<\/td>\n<\/tr>\n<tr>\n<td>HDPE<\/td>\n<td>20 \u2013 40%<\/td>\n<td>50%<\/td>\n<td>Tolerant, but colour drift and gel formation<\/td>\n<\/tr>\n<tr>\n<td>LDPE \/ LLDPE<\/td>\n<td>20 \u2013 30%<\/td>\n<td>40%<\/td>\n<td>Film grades less tolerant; gels show badly<\/td>\n<\/tr>\n<tr>\n<td>PP<\/td>\n<td>10 \u2013 25%<\/td>\n<td>30%<\/td>\n<td>Impact copolymer degrades faster than homopolymer<\/td>\n<\/tr>\n<tr>\n<td>PS \/ HIPS<\/td>\n<td>20 \u2013 30%<\/td>\n<td>40%<\/td>\n<td>HIPS rubber phase degrades; impact falls<\/td>\n<\/tr>\n<tr>\n<td>ABS<\/td>\n<td>10 \u2013 20%<\/td>\n<td>25%<\/td>\n<td>Butadiene phase oxidises; colour yellows<\/td>\n<\/tr>\n<tr>\n<td>PC<\/td>\n<td>10 \u2013 20%<\/td>\n<td>25%<\/td>\n<td>Hydrolyses if not dried; yellows badly<\/td>\n<\/tr>\n<tr>\n<td>PA<\/td>\n<td>10 \u2013 20%<\/td>\n<td>25%<\/td>\n<td>Moisture critical; must be re-dried<\/td>\n<\/tr>\n<tr>\n<td>POM<\/td>\n<td>5 \u2013 15%<\/td>\n<td>20%<\/td>\n<td>Very heat sensitive; formaldehyde release<\/td>\n<\/tr>\n<tr>\n<td>PBT \/ PET<\/td>\n<td>5 \u2013 15%<\/td>\n<td>20%<\/td>\n<td>Hydrolysis; intrinsic viscosity falls fast<\/td>\n<\/tr>\n<tr>\n<td>PPS \/ PEEK<\/td>\n<td>0 \u2013 10%<\/td>\n<td>15%<\/td>\n<td>Expensive enough to try, sensitive enough to be careful<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 2 \u2014 Practical regrind ratios by resin. PVC's tolerance is real but it is tolerance of the process, not of the chemistry \u2014 HCl evolution still accumulates.<\/p>\n<p>The PVC case is counterintuitive and worth understanding. Rigid PVC accepts 50% regrind in many profile applications because the compound is heavily stabilised and the processing temperature is low. But the stabiliser is consumed with each pass, and at some point the remaining stabiliser cannot protect the polymer. That point arrives suddenly, as a colour shift and then as degradation, and it is not predicted by the ratio alone \u2014 it is predicted by the accumulated heat history of the specific regrind batch.<\/p>\n<h2 id=\"mixing\">How to feed it back properly<\/h2>\n<p>The mistake most lines make is feeding regrind by volume rather than by weight, and feeding it unmetered. Both cause variation that gets blamed on the resin.<\/p>\n<table>\n<thead>\n<tr>\n<th>Y\u00f6ntem<\/th>\n<th>Ratio accuracy<\/th>\n<th>Tutarl\u0131l\u0131k<\/th>\n<th>\u0130\u00e7in en iyisi<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Hand mixing in the hopper<\/td>\n<td>Poor, \u00b115%<\/td>\n<td>Very poor<\/td>\n<td>Nothing; it is a quality risk<\/td>\n<\/tr>\n<tr>\n<td>Volumetric dosing<\/td>\n<td>\u00b15%<\/td>\n<td>Orta d\u00fczeyde<\/td>\n<td>Low-value product, tolerant process<\/td>\n<\/tr>\n<tr>\n<td>Gravimetric dosing<\/td>\n<td>\u00b10.5%<\/td>\n<td>\u0130yi<\/td>\n<td>Anything where the ratio is specified<\/td>\n<\/tr>\n<tr>\n<td>Gravimetric with regrind density compensation<\/td>\n<td>\u00b10.3%<\/td>\n<td>M\u00fckemmel<\/td>\n<td>Film, sheet, technical profile<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 3 \u2014 Regrind feeding methods. Volumetric dosing fails because regrind bulk density varies with flake size, so the same volume is a different weight every batch.<\/p>\n<p>Bulk density variation is the specific reason volumetric fails. Virgin pellets run at 550\u2013650 kg\/m\u00b3; regrind flake runs at 350\u2013500 kg\/m\u00b3 depending on how fine it was ground and how much dust it contains. A volumetric feeder set for 30% regrind by volume might deliver 20% by weight one hour and 38% the next, purely because the grinder was set differently.<\/p>\n<p>The other requirement is consistent flake size. A grinder with a worn screen produces a mix of fines and large flakes, and the fines melt faster while the large flakes may not melt at all. Both cause surface defects. Screen size should match the application: 6\u20138 mm for profile, 4\u20136 mm for sheet, 3\u20135 mm for film.<\/p>\n<h2 id=\"drying\">Drying: the step that gets skipped<\/h2>\n<p>Regrind is more hygroscopic than virgin resin because it has far more surface area. A flake has roughly ten times the surface-to-volume ratio of a pellet, and moisture adsorbs onto that surface within hours.<\/p>\n<table>\n<thead>\n<tr>\n<th>Resin<\/th>\n<th>Virgin drying<\/th>\n<th>Regrind drying<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>PE, PP, PS<\/td>\n<td>Not required<\/td>\n<td>Not required, but avoid condensation<\/td>\n<\/tr>\n<tr>\n<td>ABS<\/td>\n<td>80 \u00b0C \/ 2\u20133 h<\/td>\n<td>80 \u00b0C \/ 3\u20134 h<\/td>\n<\/tr>\n<tr>\n<td>PC<\/td>\n<td>120 \u00b0C \/ 3\u20134 h<\/td>\n<td>120 \u00b0C \/ 4\u20136 h<\/td>\n<\/tr>\n<tr>\n<td>PA<\/td>\n<td>80\u2013100 \u00b0C \/ 4 h<\/td>\n<td>80\u2013100 \u00b0C \/ 6\u20138 h<\/td>\n<\/tr>\n<tr>\n<td>PBT \/ PET<\/td>\n<td>120 \u00b0C \/ 4 h<\/td>\n<td>120 \u00b0C \/ 6 h<\/td>\n<\/tr>\n<tr>\n<td>POM<\/td>\n<td>80 \u00b0C \/ 2 h<\/td>\n<td>80 \u00b0C \/ 3 h<\/td>\n<\/tr>\n<tr>\n<td>PVC<\/td>\n<td>Not usually dried<\/td>\n<td>Dry at 80 \u00b0C if regrind is wet<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 4 \u2014 Drying schedules for virgin versus regrind. The longer times for regrind are not conservative padding; the moisture is genuinely harder to remove from flake.<\/p>\n<p>Wet regrind in a hygroscopic resin produces the classic hydrolysis failure: a drop in molecular weight that shows as brittleness, silver streaking and sometimes visible bubbles. It is often misdiagnosed as \"bad regrind\" when the regrind was fine and simply wet.<\/p>\n<h2 id=\"tracking\">Tracking heat history<\/h2>\n<p>The ratio is a proxy for heat history, and a poor one. What actually determines whether regrind is safe is how many times the material has been through an extruder.<\/p>\n<p>A closed-loop system where a part is ground and immediately fed back is one pass. A system where scrap from several products is collected, ground together, and fed back weeks later is an unknown number of passes \u2014 and if some of that scrap was itself made with regrind, it could be three or four.<\/p>\n<table>\n<thead>\n<tr>\n<th>Practice<\/th>\n<th>Heat history control<\/th>\n<th>Tavsiye<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Closed-loop, same product, immediate<\/td>\n<td>Known, 1 pass<\/td>\n<td>Best practice; allows highest ratio<\/td>\n<\/tr>\n<tr>\n<td>Closed-loop, same product, batch collected<\/td>\n<td>Known, 1 pass<\/td>\n<td>Good, if labelled and used in order<\/td>\n<\/tr>\n<tr>\n<td>Mixed scrap from multiple products<\/td>\n<td>Unknown<\/td>\n<td>Use at low ratio, or for non-critical product<\/td>\n<\/tr>\n<tr>\n<td>Purchased regrind<\/td>\n<td>Completely unknown<\/td>\n<td>Test before use; assume 2+ passes<\/td>\n<\/tr>\n<tr>\n<td>Regrind of regrind<\/td>\n<td>2+ passes<\/td>\n<td>Avoid; downgrade to a lower-spec product instead<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 5 \u2014 Heat history by sourcing practice. Purchased regrind is the highest-risk category because the history is unknowable and the price rarely reflects it.<\/p>\n<p>The practical control is a colour code or a label on every regrind bin recording the product, the date and whether the batch contains regrind. That sounds bureaucratic for a small plant and it is exactly what prevents the \"why did last month's batch fail\" investigation.<\/p>\n<h2 id=\"where\">Where regrind is acceptable and where it is not<\/h2>\n<table>\n<thead>\n<tr>\n<th>Uygulama<\/th>\n<th>Regrind acceptable?<\/th>\n<th>Notlar<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Non-visible structural profile<\/td>\n<td>Yes, high ratio<\/td>\n<td>Impact is the only concern; test if loaded<\/td>\n<\/tr>\n<tr>\n<td>Visible profile, painted<\/td>\n<td>Yes, moderate<\/td>\n<td>Surface defects show through paint<\/td>\n<\/tr>\n<tr>\n<td>Visible profile, unpainted<\/td>\n<td>S\u0131n\u0131rl\u0131<\/td>\n<td>Gels and colour drift are visible<\/td>\n<\/tr>\n<tr>\n<td>Pressure pipe<\/td>\n<td>Usually prohibited<\/td>\n<td>Standards often cap or forbid regrind<\/td>\n<\/tr>\n<tr>\n<td>Potable water pipe<\/td>\n<td>Prohibited in most standards<\/td>\n<td>Certification issue, not a technical one<\/td>\n<\/tr>\n<tr>\n<td>Medical \/ food contact<\/td>\n<td>Usually prohibited<\/td>\n<td>Traceability requirement<\/td>\n<\/tr>\n<tr>\n<td>Optical \/ clear products<\/td>\n<td>Hay\u0131r<\/td>\n<td>Gels and haze are immediately visible<\/td>\n<\/tr>\n<tr>\n<td>Film<\/td>\n<td>Limited, low ratio<\/td>\n<td>Gels are the limiting defect<\/td>\n<\/tr>\n<tr>\n<td>Electrical insulation<\/td>\n<td>S\u0131n\u0131rl\u0131<\/td>\n<td>Dielectric strength falls with contamination<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 6 \u2014 Where regrind belongs. The prohibitions in pipe and medical are certification constraints, and no amount of technical justification overrides them.<\/p>\n<p>The certification point is worth stating plainly because it is often missed. Many pipe standards, and virtually all potable water and medical standards, prohibit or strictly limit regrind regardless of whether the material would perform. Using regrind in a certified product is not a quality risk \u2014 it is a compliance failure, and it invalidates the certification of the whole batch.<\/p>\n<div class=\"faq\">\n<h3>How much regrind can I put back into extrusion?<\/h3>\n<p>It depends on the resin and the application. PVC profile tolerates 30\u201350%, HDPE 20\u201340%, PP 10\u201325%, and engineering resins like PC, PA and POM 5\u201320%. The limit is set by impact strength, which falls 10\u201325% per pass, and by surface quality if the product is visible.<\/p>\n<h3>Why does impact strength fall but tensile strength does not?<\/h3>\n<p>Because they depend on different things. Impact strength depends on long polymer chains entangling and absorbing energy, so chain scission during reprocessing hits it directly. Tensile strength depends more on chain alignment and the crystalline or glassy phase, which survive reprocessing largely intact.<\/p>\n<h3>Does regrind need to be dried?<\/h3>\n<p>Yes, and for longer than virgin resin. Regrind flake has roughly ten times the surface area of pellets, so it adsorbs moisture faster and holds it more tenaciously. For PC and PA, wet regrind causes hydrolysis, which shows as brittleness and silver streaks.<\/p>\n<h3>Why do I get gels and specks when I use regrind?<\/h3>\n<p>Because gels are crosslinked or oxidised particles that do not melt, and grinding does not remove them. They pass through a coarse screen pack and appear as surface defects. Use a finer screen, keep the extruder temperature down, and avoid letting material sit hot in the barrel.<\/p>\n<h3>Can I use regrind in pressure pipe?<\/h3>\n<p>Usually not. Most pipe standards prohibit or strictly limit regrind in pressure applications, and potable water standards prohibit it outright. This is a certification constraint \u2014 using regrind invalidates the certification of the batch regardless of whether the pipe would perform.<\/p>\n<h3>How many times can plastic be recycled?<\/h3>\n<p>For most thermoplastics, two to three passes before impact strength becomes unacceptable. PVC and HDPE tolerate more; POM, PBT and PP tolerate less. The limit is cumulative heat history, not the number of times it was ground.<\/p>\n<h3>Does regrind change the colour?<\/h3>\n<p>Yes, usually towards yellow or grey. Thermal oxidation darkens the polymer, and each pass adds to it. In light-coloured products the shift becomes visible at 20\u201330% regrind, which is often the real limit rather than any mechanical property.<\/p>\n<h3>What grind size should I use?<\/h3>\n<p>6\u20138 mm screen for profile, 4\u20136 mm for sheet, 3\u20135 mm for film. The requirement is consistency more than size: a mix of fines and large flakes melts unevenly and causes surface defects. Replace worn screens, because a worn screen produces exactly that mix.<\/p>\n<\/div>\n<div class=\"cta\">\n<p class=\"cta-h\">Trying to raise regrind content without losing quality?<\/p>\n<p>Tell us the resin, the product, the current regrind ratio and the property you are seeing fall. We will tell you where the practical ceiling is and what it takes to get there \u2014 drying, dosing, screening or formulation.<\/p>\n<p><a class=\"btn\" href=\"https:\/\/uplastech.com\/tr\/plasti%cc%87k-ekstruzyon-cozumleri%cc%87\/\">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\/tr\/plasti%cc%87k-ekstruzyon-hatalari\/\">Plastic Extrusion Defects: 12 Problems, Causes and Fixes<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/tr\/extrusion-quality-control\/\">Extrusion Quality Control: Inspection, SPC and Acceptance<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/tr\/extruder-screw-design\/\">Extruder Screw Design: Zones, Compression Ratio and Wear<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/tr\/colour-changeover-in-extrusion\/\">Colour Changeover in Extrusion: Purge Compounds, Sequence and Downtime<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>What actually happens to tensile strength, impact and surface finish as regrind ratio climbs, and the practical ceiling for PVC, PE, PP and engineering resins.<\/p>","protected":false},"author":1,"featured_media":7654,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Regrind and Recycled Content in Extrusion: Ratios, Drying an","_seopress_titles_desc":"What actually happens to tensile strength, impact and surface finish as regrind ratio climbs, and the practical ceiling for PVC, PE, PP and engineering res","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"17","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"regrind extrusion","footnotes":""},"categories":[17],"tags":[],"class_list":["post-7666","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-plastic-extrusion-process"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/uplastech.com\/tr\/wp-json\/wp\/v2\/posts\/7666","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/uplastech.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/uplastech.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/uplastech.com\/tr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/uplastech.com\/tr\/wp-json\/wp\/v2\/comments?post=7666"}],"version-history":[{"count":1,"href":"https:\/\/uplastech.com\/tr\/wp-json\/wp\/v2\/posts\/7666\/revisions"}],"predecessor-version":[{"id":7717,"href":"https:\/\/uplastech.com\/tr\/wp-json\/wp\/v2\/posts\/7666\/revisions\/7717"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/uplastech.com\/tr\/wp-json\/wp\/v2\/media\/7654"}],"wp:attachment":[{"href":"https:\/\/uplastech.com\/tr\/wp-json\/wp\/v2\/media?parent=7666"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/uplastech.com\/tr\/wp-json\/wp\/v2\/categories?post=7666"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/uplastech.com\/tr\/wp-json\/wp\/v2\/tags?post=7666"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}