{"id":12188,"date":"2026-04-17T02:50:37","date_gmt":"2026-04-17T02:50:37","guid":{"rendered":"https:\/\/ideal-pro.com\/?p=12188"},"modified":"2026-04-17T03:39:25","modified_gmt":"2026-04-17T03:39:25","slug":"mastering-pc-injection-molding-a-comprehensive-guide-to-polycarbonate-processing","status":"publish","type":"post","link":"https:\/\/ideal-pro.com\/fr\/mastering-pc-injection-molding-a-comprehensive-guide-to-polycarbonate-processing\/","title":{"rendered":"Mastering PC Injection Molding: A Comprehensive Guide to Polycarbonate Processing"},"content":{"rendered":"<h4>Introduction: Understanding Polycarbonate (PC)<\/h4>\n<p><a href=\"https:\/\/ideal-pro.com\/ko\/pc-injection-molding-guide\/\" target=\"_blank\" rel=\"noopener noreferrer\">Polycarbonate (PC)<\/a><sup id=\"fnref-1\"><a href=\"#fn-1\" class=\"footnote-ref\">1<\/a><\/sup> is renowned for its exceptional performance, offering high transparency, excellent impact toughness, creep resistance, and a wide operating temperature range. However, processing this engineering plastic requires precision.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/ideal-pro.com\/wp-content\/uploads\/2026\/04\/2-1-3.jpg\" alt=\"Mastering PC Injection Molding: A Comprehensive Guide to Polycarbonate Processing\"><\/p>\n<p><strong>Key Material Characteristics:<\/strong><\/p>\n<ul>\n<li><strong>Viscosity Sensitivity:<\/strong> PC melt viscosity is highly sensitive to temperature but less sensitive to shear rate.<\/li>\n<li><strong>No Clear Melting Point:<\/strong> It softens over a range.<\/li>\n<li><strong>High Melt Viscosity:<\/strong> Requires higher processing temperatures.<\/li>\n<li><strong>Hydrolysis Risk:<\/strong> The resin is prone to hydrolysis at high temperatures if moisture is present, leading to part degradation.<\/li>\n<\/ul>\n<blockquote>\n<p><strong>Conseil de pro :<\/strong> To improve melt flow, do not rely solely on increasing injection pressure. Instead, raise the injection temperature. However, strict moisture control is non-negotiable.<\/p>\n<\/blockquote>\n<hr>\n<h4>&#128736;&#65039; Critical Pre-Processing: Drying &amp; Mold Design<\/h4>\n<p>Before the injection process begins, specific steps must be taken to ensure quality.<\/p>\n<ol>\n<li><strong><a href=\"https:\/\/ideal-pro.com\/fr\/cinq-points-importants-auxquels-il-faut-preter-attention-lors-du-formage-de-pieces-transparentes-moulees-par-injection\/\" target=\"_blank\" rel=\"noopener noreferrer\">Drying is Mandatory<\/a><sup id=\"fnref-2\"><a href=\"#fn-2\" class=\"footnote-ref\">2<\/a><\/sup>:<\/strong> PC must be dried thoroughly to reduce moisture content to below <strong>0.02%<\/strong>.<\/li>\n<li><strong>Moisture Protection:<\/strong> Keep the resin insulated during processing to prevent re-absorption of moisture from the air.<\/li>\n<li><strong>Conception du moule :<\/strong> Runners and gates should be short and thick to minimize pressure loss.<\/li>\n<li><strong>Stress Reduction:<\/strong> High mold temperatures and post-processing annealing are recommended to eliminate internal stress and prevent cracking.<\/li>\n<\/ol>\n<p><img decoding=\"async\" src=\"https:\/\/ideal-pro.com\/wp-content\/uploads\/2026\/04\/2-2-4.jpg\" alt=\"Polycarbonate resin drying process and moisture testing equipment.\"><\/p>\n<hr>\n<h4>&#9881;&#65039; The 7 Key Parameters of PC Injection Molding<\/h4>\n<p>Here is a detailed breakdown of the processing window for PC.<\/p>\n<p><strong>1. <a href=\"https:\/\/ideal-pro.com\/fr\/injection-molding-shrinkage-how-temperature-speed-affect-quality\/\" target=\"_blank\" rel=\"noopener noreferrer\">Injection Temperature<\/a><sup id=\"fnref-3\"><a href=\"#fn-3\" class=\"footnote-ref\">3<\/a><\/sup><\/strong>\nTemperature selection depends on part geometry, mold structure, and requirements.<\/p>\n<ul>\n<li><strong>Standard Range:<\/strong> 270&deg;C &ndash; 320&deg;C.<\/li>\n<li><strong>Warning:<\/strong> Exceeding <strong>340&deg;C<\/strong> can cause decomposition. Signs include darkened color, silver streaks, dark spots, and bubbles. Mechanical properties will significantly degrade.<\/li>\n<\/ul>\n<p><strong>2. <a href=\"https:\/\/ideal-pro.com\/fr\/how-to-solve-injection-molding-surface-defects-like-dark-spots-gloss-differences-and-orange-peel\/\" target=\"_blank\" rel=\"noopener noreferrer\">Pression d'injection<\/a><sup id=\"fnref-4\"><a href=\"#fn-4\" class=\"footnote-ref\">4<\/a><\/sup><\/strong>\nPressure affects physical properties, internal stress, and shrinkage.<\/p>\n<ul>\n<li><strong>Standard Range:<\/strong> 80 &ndash; 120 MPa.<\/li>\n<li><strong>High Pressure (120 &ndash; 145 MPa):<\/strong> Required for thin-walled, long-flow, or complex parts with small gates to overcome flow resistance.<\/li>\n<\/ul>\n<p><strong>3. Holding Pressure &amp; Time<\/strong>\nCrucial for preventing vacuum voids and sink marks.<\/p>\n<ul>\n<li><strong>Strategy:<\/strong> Low holding pressure with high melt temperature is often the best approach to reduce internal stress.<\/li>\n<li><strong>Timing:<\/strong> Thin parts need short holding times; thick parts require longer times. This is often determined by the gate freeze-off time.<\/li>\n<\/ul>\n<p><strong>4. Injection Speed<\/strong>\nWhile speed has less impact on PC properties, flow control is key.<\/p>\n<ul>\n<li><strong>Recommendation:<\/strong> Use medium to slow speeds.<\/li>\n<li><strong>Technique:<\/strong> Multi-stage injection (Slow-Fast-Slow) is preferred to ensure smooth filling without trapping air.<\/li>\n<\/ul>\n<p><strong>5. <a href=\"https:\/\/ideal-pro.com\/fr\/injection-molding-shrinkage-how-temperature-speed-affect-quality\/\" target=\"_blank\" rel=\"noopener noreferrer\">Temp\u00e9rature du moule<\/a><sup id=\"fnref-5\"><a href=\"#fn-5\" class=\"footnote-ref\">5<\/a><\/sup><\/strong><\/p>\n<ul>\n<li><strong>Standard:<\/strong> 80&deg;C &ndash; 100&deg;C.<\/li>\n<li><strong>Complex\/Thin Parts:<\/strong> Can be increased to 100&deg;C &ndash; 120&deg;C (ensure this is below the mold steel's tempering temperature).<\/li>\n<\/ul>\n<p><strong>6. <a href=\"https:\/\/ideal-pro.com\/fr\/troubleshooting-black-spots-discoloration-in-injection-molding\/\" target=\"_blank\" rel=\"noopener noreferrer\">Screw Speed &amp; Back Pressure<\/a><sup id=\"fnref-6\"><a href=\"#fn-6\" class=\"footnote-ref\">6<\/a><\/sup><\/strong>\nDue to high viscosity, excessive speed can damage the machine or the material.<\/p>\n<ul>\n<li><strong>Screw Speed:<\/strong> 30 &ndash; 60 r\/min.<\/li>\n<li><strong>Back Pressure:<\/strong> 10% &ndash; 15% of injection pressure.<\/li>\n<\/ul>\n<p><strong>7. Material Usage<\/strong><\/p>\n<ul>\n<li><strong>Release Agents:<\/strong> Use strictly controlled amounts.<\/li>\n<li><strong>Recycled Material:<\/strong> Limit re-grind usage to max 20% and no more than 3 cycles.<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/ideal-pro.com\/wp-content\/uploads\/2026\/04\/2-3-2.jpg\" alt=\"PC injection molding processing window chart.\"><\/p>\n<hr>\n<h4>Quick Reference: PC Processing Parameters<\/h4>\n<p>For easy reference, here is a summary of the optimal settings.<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left;\">Param\u00e8tres<\/th>\n<th style=\"text-align: left;\">Recommended Setting<\/th>\n<th style=\"text-align: left;\">Notes<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left;\"><strong>Drying Temp\/Time<\/strong><\/td>\n<td style=\"text-align: left;\">120&deg;C \/ 4+ Hours<\/td>\n<td style=\"text-align: left;\">Moisture &lt; 0.02%<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Temp\u00e9rature de fusion<\/strong><\/td>\n<td style=\"text-align: left;\">270&deg;C - 320&deg;C<\/td>\n<td style=\"text-align: left;\">Do not exceed 340&deg;C<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Pression d'injection<\/strong><\/td>\n<td style=\"text-align: left;\">80 - 145 MPa<\/td>\n<td style=\"text-align: left;\">Higher for thin walls<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Temp\u00e9rature du moule<\/strong><\/td>\n<td style=\"text-align: left;\">80&deg;C - 120&deg;C<\/td>\n<td style=\"text-align: left;\">Higher temp reduces stress<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Screw Speed<\/strong><\/td>\n<td style=\"text-align: left;\">30 - 60 r\/min<\/td>\n<td style=\"text-align: left;\">Prevents shear heating<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left;\"><strong>Back Pressure<\/strong><\/td>\n<td style=\"text-align: left;\">10% - 15%<\/td>\n<td style=\"text-align: left;\">Ensures melt density<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr>\n<h4>Screw Selection &amp; Machine Requirements<\/h4>\n<p>Choosing the right hardware is as important as setting the parameters.<\/p>\n<p><strong>Machine Requirements:<\/strong><\/p>\n<ul>\n<li><strong>Shot Size:<\/strong> The maximum part weight (including runners) should not exceed 70-80% of the machine's nominal injection capacity.<\/li>\n<\/ul>\n<p><strong>Screw Specifications:<\/strong><\/p>\n<ul>\n<li><strong>Type:<\/strong> Single-flight, constant pitch, gradual compression screw with a non-return valve (check ring).<\/li>\n<li><strong>L\/D Ratio (Length\/Diameter):<\/strong> 15:1 to 20:1.<\/li>\n<li><strong>Compression Ratio:<\/strong> 2:1 to 3:1.<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/ideal-pro.com\/wp-content\/uploads\/2026\/04\/2-4-1.jpg\" alt=\"Technical diagram of an injection molding screw for polycarbonate.\"><\/p>\n<hr>\n<h4>Conclusion<\/h4>\n<p>Mastering PC injection molding requires a balance of thermal control and pressure management. By strictly controlling moisture and adhering to the temperature and screw speed guidelines above, you can produce high-clarity, impact-resistant parts with minimal internal stress.<\/p>\n<hr><div class=\"footnotes\"><hr><ol><li id=\"fn-1\"><p>Explore the advantages of Polycarbonate (PC) to understand its applications and benefits in various industries.\r <a href=\"#fnref-1\" class=\"footnote-backref\">\u21a9<\/a><\/p><\/li><li id=\"fn-2\"><p>Understand the importance of drying Polycarbonate to ensure optimal processing and part quality.\r <a href=\"#fnref-2\" class=\"footnote-backref\">\u21a9<\/a><\/p><\/li><li id=\"fn-3\"><p>Find out the best injection temperature settings for Polycarbonate to ensure quality and performance.\r <a href=\"#fnref-3\" class=\"footnote-backref\">\u21a9<\/a><\/p><\/li><li id=\"fn-4\"><p>Explore how injection pressure affects the molding process and the final properties of Polycarbonate parts.\r <a href=\"#fnref-4\" class=\"footnote-backref\">\u21a9<\/a><\/p><\/li><li id=\"fn-5\"><p>Explore the relationship between mold temperature and the quality of Polycarbonate parts in injection molding.\r <a href=\"#fnref-5\" class=\"footnote-backref\">\u21a9<\/a><\/p><\/li><li id=\"fn-6\"><p>Learn how screw speed and back pressure influence the injection molding process and material quality.\r <a href=\"#fnref-6\" class=\"footnote-backref\">\u21a9<\/a><\/p><\/li><\/ol><\/div>","protected":false},"excerpt":{"rendered":"<p>Introduction: Understanding Polycarbonate (PC) Polycarbonate (PC)1 is renowned for its exceptional performance, offering high transparency, excellent impact toughness, creep resistance, [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":12192,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Mastering PC Injection Molding: A Comprehensive Guide to Polycarbonate Processing","_seopress_titles_desc":"Discover the essential parameters for Polycarbonate (PC) injection molding. Learn about temperature control, pressure settings, screw selection, and drying requirements to prevent defects.","_seopress_robots_index":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[21],"tags":[36,42,184,183],"class_list":["post-12188","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-injection-molding","tag-pc-injection-molding","tag-plastic-processing","tag-polycarbonate"],"acf":[],"_links":{"self":[{"href":"https:\/\/ideal-pro.com\/fr\/wp-json\/wp\/v2\/posts\/12188","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ideal-pro.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ideal-pro.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ideal-pro.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ideal-pro.com\/fr\/wp-json\/wp\/v2\/comments?post=12188"}],"version-history":[{"count":3,"href":"https:\/\/ideal-pro.com\/fr\/wp-json\/wp\/v2\/posts\/12188\/revisions"}],"predecessor-version":[{"id":12197,"href":"https:\/\/ideal-pro.com\/fr\/wp-json\/wp\/v2\/posts\/12188\/revisions\/12197"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ideal-pro.com\/fr\/wp-json\/wp\/v2\/media\/12192"}],"wp:attachment":[{"href":"https:\/\/ideal-pro.com\/fr\/wp-json\/wp\/v2\/media?parent=12188"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ideal-pro.com\/fr\/wp-json\/wp\/v2\/categories?post=12188"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ideal-pro.com\/fr\/wp-json\/wp\/v2\/tags?post=12188"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}