{"id":14070,"date":"2026-03-06T15:32:54","date_gmt":"2026-03-06T14:32:54","guid":{"rendered":"https:\/\/orangeplastics.com\/how-does-an-injection-molding-machine-work\/"},"modified":"2026-04-16T14:28:48","modified_gmt":"2026-04-16T12:28:48","slug":"how-does-an-injection-molding-machine-work","status":"publish","type":"post","link":"https:\/\/orangeplastics.com\/en\/how-does-an-injection-molding-machine-work\/","title":{"rendered":"How does an injection molding machine work?"},"content":{"rendered":"\n<p><strong>An injection molding machine functions as a large press that holds a mold closed while liquid plastic is injected into the cavity. Thanks to this precision, complex and uniform plastic products can be produced in high volumes. In this blog, we explain how an injection molding machine works, what the most important parts are, and what to look out for in production planning.  <br\/><\/strong><br\/><\/p>\n\n<section class=\"wp-block-qi-blocks-columns qodef-gutenberg-section qodef--template qodef-block-8b2007a2 qodef-col-num--1 qodef-col-layout--100 qodef-content--boxed\"><div class=\"qodef-section-background-overlay\"><\/div><div class=\"qodef-gutenberg-row\">\n<div class=\"wp-block-qi-blocks-column qodef-gutenberg-column qodef-block-936487f4\"><div class=\"qodef-gutenberg-column-inner\">\n<h2 class=\"wp-block-heading has-white-color has-text-color has-link-color wp-elements-a1a0cdea0b1c36de4121ddc65257ab3e\" id=\"samenvatting\" style=\"font-size:40px\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-white-color has-text-color has-link-color wp-elements-a17c26c73a4164c1d986e9ebed97debb\">An injection molding machine produces plastic products by injecting molten plastic into a mold under high pressure.<\/li>\n\n\n\n<li class=\"has-white-color has-text-color has-link-color wp-elements-2895652fa26dac7dd0ccb9507c332f8c\">The machine consists of essential parts such as the hopper, heating unit, and injection screw.<\/li>\n\n\n\n<li class=\"has-white-color has-text-color has-link-color wp-elements-2f763f518cc88036a1bd84e3d700061f\">The injection molding process follows fixed steps: closing, injecting, high pressure, cooling, and ejecting.<\/li>\n\n\n\n<li class=\"has-white-color has-text-color has-link-color wp-elements-4984d59dc6200c774fdd4dbae8838164\">Clamping force is a crucial factor that determines whether the mold remains closed and the product is formed correctly.<\/li>\n\n\n\n<li class=\"has-white-color has-text-color has-link-color wp-elements-151edeb42181426a5f40b197276fb3f8\">Injection molding is particularly cost-efficient at larger volumes, but thanks to modern techniques, it can also be profitable for smaller series.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/section>\n\n<p><br\/><\/p>\n\n<section class=\"wp-block-qi-blocks-columns qodef-gutenberg-section qodef--template qodef-block-58f5bb9d qodef-col-num--1 qodef-col-layout--100 qodef-content--boxed\"><div class=\"qodef-section-background-overlay\"><\/div><div class=\"qodef-gutenberg-row\">\n<div class=\"wp-block-qi-blocks-column qodef-gutenberg-column qodef-block-59dc7068\"><div class=\"qodef-gutenberg-column-inner\">\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h3>Table of contents<\/h3><nav><ul><li class=\"\"><a href=\"#samenvatting\">Summary<\/a><\/li><li class=\"\"><a href=\"#hoe-werkt-spuitgieten\">\nThe basic components of an injection molding machine<\/a><\/li><li class=\"\"><a href=\"#hoe-werkt-spuitgieten-1\">\nThe injection molding process: the injection cycle<\/a><ul><li class=\"\"><a href=\"#1-smelten-van-het-kunststofgranulaat\">1. Closing the mold<\/a><\/li><li class=\"\"><a href=\"#2-injectie-in-de-matrijs\">2. Injection of the plastic<\/a><\/li><li class=\"\"><a href=\"#3-koelen-en-uitharden\">3. Maintaining pressure<\/a><\/li><li class=\"\"><a href=\"#4-openen-van-het-matrijs\">4. Preparing the next injection<\/a><\/li><li class=\"\"><a href=\"#5-uitwerpen-van-het-product\">5. Cooling and ejection<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#hoe-kies-je-de-juiste-matrijs-en-machine\">\nDifferences between injection molding machines<\/a><ul><li class=\"\"><a href=\"#5-uitwerpen-van-het-product-1\">Clamping pressure (clamping force)<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#voordelen-van-spuitgieten\">\nWhat production volume is needed for injection molding?<\/a><ul><li class=\"\"><a href=\"#hoge-volumes-en-snelheid\">Low-volume injection molding<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#voordelen-van-spuitgieten-1\">\nHow do you choose the right mold and material?<\/a><\/li><li class=\"\"><a href=\"#conclusie\">\nConclusion<\/a><ul><li class=\"\"><a href=\"#uw-product-laten-ontwikkelen\">Want to have your product developed?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<\/div><\/div>\n<\/div><\/section>\n\n<h2 class=\"wp-block-heading\" id=\"hoe-werkt-spuitgieten\" style=\"font-size:40px\"><br\/>The basic components of an injection molding machine<\/h2>\n\n<p>An injection molding machine roughly consists of three parts:<\/p>\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Hopper (funnel):<\/strong> this is where the plastic granules are fed in.<\/li>\n\n\n\n<li><strong>Heating unit<\/strong>: heats the plastic into a liquid form.<\/li>\n\n\n\n<li><strong>Plunger:<\/strong> pushes the liquid plastic into the mold.<\/li>\n<\/ol>\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"606\" src=\"https:\/\/orangeplastics.com\/wp-content\/uploads\/2026\/03\/Werking-spuitgietmachine-basiscomponenten-1024x606.jpg\" alt=\"\" class=\"wp-image-13686\" srcset=\"https:\/\/orangeplastics.com\/wp-content\/uploads\/2026\/03\/Werking-spuitgietmachine-basiscomponenten-1024x606.jpg 1024w, https:\/\/orangeplastics.com\/wp-content\/uploads\/2026\/03\/Werking-spuitgietmachine-basiscomponenten-300x178.jpg 300w, https:\/\/orangeplastics.com\/wp-content\/uploads\/2026\/03\/Werking-spuitgietmachine-basiscomponenten-768x455.jpg 768w, https:\/\/orangeplastics.com\/wp-content\/uploads\/2026\/03\/Werking-spuitgietmachine-basiscomponenten-1536x910.jpg 1536w, https:\/\/orangeplastics.com\/wp-content\/uploads\/2026\/03\/Werking-spuitgietmachine-basiscomponenten.jpg 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<p><em>The components of an injection molding machine. <\/em><br\/><\/p>\n\n<h2 class=\"wp-block-heading\" id=\"hoe-werkt-spuitgieten-1\" style=\"font-size:40px\"><br\/>The injection molding process: the injection cycle<\/h2>\n\n<p><a href=\"https:\/\/orangeplastics.com\/engineering\/\">Creating a plastic product<\/a> involves a series of steps, known as the <strong>injection cycle<\/strong>:<\/p>\n\n<h3 class=\"wp-block-heading\" id=\"1-smelten-van-het-kunststofgranulaat\" style=\"font-size:30px\">1. Closing the mold<\/h3>\n\n<p>The mold is closed tightly so that the liquid plastic can be injected under high pressure.<\/p>\n\n<h3 class=\"wp-block-heading\" id=\"2-injectie-in-de-matrijs\" style=\"font-size:30px\">2. Injection of the plastic<\/h3>\n\n<p>The liquid polymers are injected into the mold cavity until it is completely filled.<\/p>\n\n<h3 class=\"wp-block-heading\" id=\"3-koelen-en-uitharden\" style=\"font-size:30px\">3. Maintaining pressure<\/h3>\n\n<p>he machine maintains pressure to compensate for the shrinkage of the material.<\/p>\n\n<h3 class=\"wp-block-heading\" id=\"4-openen-van-het-matrijs\" style=\"font-size:30px\">4. Preparing the next injection<\/h3>\n\n<p>After injecting, the screw rotates plastic forward while simultaneously rotating back to take in material from the hopper and prepare it for the next injection.<\/p>\n\n<h3 class=\"wp-block-heading\" id=\"5-uitwerpen-van-het-product\" style=\"font-size:30px\">5. Cooling and ejection<\/h3>\n\n<p>After cooling, the mold is opened and the ejector rod pushes the product out of the mold.<br\/><br\/><\/p>\n\n<section class=\"wp-block-qi-blocks-columns qodef-gutenberg-section qodef--template qodef-block-6a0ce6a2 qodef-col-num--1 qodef-col-layout--100 qodef-content--boxed\"><div class=\"qodef-section-background-overlay\"><\/div><div class=\"qodef-gutenberg-row\">\n<div class=\"wp-block-qi-blocks-column qodef-gutenberg-column qodef-block-ab480897 qodef-vertical-align--middle qodef-horizontal-align--center\"><div class=\"qodef-gutenberg-column-inner\">\n<h4 class=\"wp-block-heading has-text-align-center has-white-color has-text-color has-link-color wp-elements-14671d2ffb644640ca88e851a880df8e\" id=\"let-op-ontwerp-bepaalt-het-succes-bij-spuitgieten\">Important point<\/h4>\n\n\n\n<p class=\"has-text-align-center has-white-color has-text-color has-link-color wp-elements-695c7d79e988a300b9f55118b9368da7\">A common mistake in injection molding is that clamping force and plastic choice are only considered late in the process. By aligning these factors as early as the design phase, you prevent production errors, unnecessary costs, and delays in the production process. <\/p>\n<\/div><\/div>\n<\/div><\/section>\n\n<div class=\"wp-block-qi-blocks-spacer qodef-block-container qodef-block-18766dbe\"><div class=\"qi-block-spacer qodef-block qodef-m\"><\/div><\/div>\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/orangeplastics.com\/wp-content\/uploads\/2026\/04\/Working-injection-molding-machine-explained.jpg\" alt=\"\" class=\"wp-image-13691\" style=\"width:1100px;height:auto\"\/><\/figure>\n\n<p><em>The five steps of the injection molding process.<\/em><\/p>\n\n<h2 class=\"wp-block-heading\" id=\"hoe-kies-je-de-juiste-matrijs-en-machine\" style=\"font-size:40px\"><br\/>Differences between injection molding machines<\/h2>\n\n<p>Injection molding machines can differ greatly in capacity and application. One of the most decisive factors is the <strong>clamping force of the machine<\/strong>. This property directly influences the quality of the end product and determines which type of mold and plastic can be processed safely and efficiently. This chapter explains exactly what clamping force entails, why it is so important, and how you can determine the required clamping force.   <\/p>\n\n<h3 class=\"wp-block-heading\" id=\"5-uitwerpen-van-het-product-1\" style=\"font-size:30px\">Clamping pressure (clamping force)<\/h3>\n\n<p>The most important difference between machines is the <strong>clamping pressure,<\/strong> the force that keeps the mold closed during injection. This can vary from <strong>5 tons to more than 3,000 tons<\/strong>. <\/p>\n\n<ul class=\"wp-block-list\">\n<li>Insufficient clamping force can lead to leakage or incomplete products.<\/li>\n\n\n\n<li>The required pressure is determined by the surface area of the product and the type of plastic.<\/li>\n<\/ul>\n\n<section class=\"wp-block-qi-blocks-columns qodef-gutenberg-section qodef--template qodef-block-851bb6a3 qodef-col-num--1 qodef-col-layout--100 qodef-content--boxed\"><div class=\"qodef-section-background-overlay\"><\/div><div class=\"qodef-gutenberg-row\">\n<div class=\"wp-block-qi-blocks-column qodef-gutenberg-column qodef-block-61bdf190 qodef-vertical-align--middle qodef-horizontal-align--center\"><div class=\"qodef-gutenberg-column-inner\">\n<h4 class=\"wp-block-heading has-text-align-center has-white-color has-text-color has-link-color wp-elements-b9bab129ffb5b42c0d8bb36b539a713a\" id=\"let-op-ontwerp-bepaalt-het-succes-bij-spuitgieten\">Rule of thumb<\/h4>\n\n\n\n<p class=\"has-text-align-center has-white-color has-text-color has-link-color wp-elements-ed3838d76b726c6ada3c2feba9b27aad\">Multiply the surface area in square inches by 2.5 and add a 10% safety margin. Stiff material often requires higher injection pressure. <\/p>\n<\/div><\/div>\n<\/div><\/section>\n\n<h2 class=\"wp-block-heading\" id=\"voordelen-van-spuitgieten\" style=\"font-size:40px\"><br\/>What production volume is needed for injection molding?<\/h2>\n\n<p><a href=\"https:\/\/orangeplastics.com\/en\/injection-molding\/\" data-type=\"page\" data-id=\"9123\">Injection molding<\/a> is ideal for <strong>large numbers of identical products<\/strong> due to the low average production costs per piece. Although start-up costs (such as the mold) are high, you benefit from significant savings at larger volumes. <\/p>\n\n<h3 class=\"wp-block-heading\" id=\"hoge-volumes-en-snelheid\" style=\"font-size:30px\">Low-volume injection molding<\/h3>\n\n<p>Thanks to modern optimizations,<a href=\"https:\/\/orangeplastics.com\/en\/injection-molding\/low-volume\/\" data-type=\"page\" data-id=\"12154\"> injection molding can now also be efficient for smaller runs<\/a>. Projects can be profitably produced starting from 1,000 units. <\/p>\n\n<h2 class=\"wp-block-heading\" id=\"voordelen-van-spuitgieten-1\" style=\"font-size:40px\"><br\/>How do you choose the right mold and material?<\/h2>\n\n<p>An experienced <a href=\"https:\/\/orangeplastics.com\/en\/injection-molding\/\">injection molding partner<\/a> helps in selecting:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>The right <strong>mold design<\/strong><\/li>\n\n\n\n<li>The optimal <strong>plastic material<\/strong><\/li>\n\n\n\n<li>The best <strong>production parameters<\/strong> for the desired volume<\/li>\n<\/ul>\n\n<p>This ensures a reliable production process, regardless of the number of pieces.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"conclusie\" style=\"font-size:40px\"><br\/>Conclusion<\/h2>\n\n<p>Injection molding is an efficient and accurate production process for plastic products. Insight into <strong>how the machine works<\/strong>, <strong>the injection process<\/strong>, and factors such as <strong>clamping force<\/strong>, <strong>material choice,<\/strong> and <strong>production volume<\/strong> is essential for a reliable end result. With the right knowledge and an experienced partner, injection molding can be a cost-effective solution for both small and large series.  <\/p>\n\n<section class=\"wp-block-qi-blocks-columns qodef-gutenberg-section qodef--template qodef-block-3acbbf35 qodef-col-num--1 qodef-col-layout--100 qodef-content--boxed\"><div class=\"qodef-section-background-overlay\"><\/div><div class=\"qodef-gutenberg-row\">\n<div class=\"wp-block-qi-blocks-column qodef-gutenberg-column qodef-block-79086a92 qodef-horizontal-align--start\"><div class=\"qodef-gutenberg-column-inner\">\n<h3 class=\"wp-block-heading has-white-color has-text-color has-link-color wp-elements-43dfdc6224cfd9c25d75438f9bc132b2\" id=\"uw-product-laten-ontwikkelen\" style=\"font-size:40px\">Want to have your product developed?<\/h3>\n\n\n\n<p class=\"has-white-color has-text-color has-link-color wp-elements-831c02f4ba4694b59e0b6cb55ac18265\" id=\"uw-product-laten-ontwikkelen\">Do you have a product idea or want a quick price estimate? Contact us and we will assist you right away. <\/p>\n\n\n\n<div class=\"wp-block-qi-blocks-spacer qodef-block-container qodef-block-62b1e08b\"><div class=\"qi-block-spacer qodef-block qodef-m\"><\/div><\/div>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-fill\"><a class=\"wp-block-button__link has-white-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/orangeplastics.com\/en\/price-indication\/\" style=\"background-color:#f6861f\">Request a price indication<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/section>\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>An injection molding machine functions as a large press that holds a mold closed while liquid plastic is injected into the cavity. Thanks to this precision, complex and uniform plastic products can be produced in high volumes. In this blog, we explain how an injection molding machine works, what the most important parts are, and [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":11562,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[173,172],"tags":[],"class_list":["post-14070","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-about-injection-molding","category-orange-plastics-news"],"_links":{"self":[{"href":"https:\/\/orangeplastics.com\/en\/wp-json\/wp\/v2\/posts\/14070","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/orangeplastics.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/orangeplastics.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/orangeplastics.com\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/orangeplastics.com\/en\/wp-json\/wp\/v2\/comments?post=14070"}],"version-history":[{"count":7,"href":"https:\/\/orangeplastics.com\/en\/wp-json\/wp\/v2\/posts\/14070\/revisions"}],"predecessor-version":[{"id":14089,"href":"https:\/\/orangeplastics.com\/en\/wp-json\/wp\/v2\/posts\/14070\/revisions\/14089"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/orangeplastics.com\/en\/wp-json\/wp\/v2\/media\/11562"}],"wp:attachment":[{"href":"https:\/\/orangeplastics.com\/en\/wp-json\/wp\/v2\/media?parent=14070"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/orangeplastics.com\/en\/wp-json\/wp\/v2\/categories?post=14070"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/orangeplastics.com\/en\/wp-json\/wp\/v2\/tags?post=14070"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}