{"id":6637,"date":"2024-06-08T16:19:36","date_gmt":"2024-06-08T14:19:36","guid":{"rendered":"https:\/\/www.hybster.com\/?post_type=documentation&#038;p=6637"},"modified":"2026-05-11T12:34:21","modified_gmt":"2026-05-11T10:34:21","slug":"how-does-a-plastic-injection-mould-work","status":"publish","type":"documentation","link":"https:\/\/hybster.com\/en\/documentation\/comment-fonctionne-un-moule-dinjection-plastique\/","title":{"rendered":"How does a plastic injection mould work?"},"content":{"rendered":"<h1><span style=\"font-family: Sarabun; font-weight: 800; letter-spacing: -0.03em;\">Plastic injection mould construction: design, manufacture and operation<\/span><\/h1>\n<div>\n<p>the <strong>Plastic injection mould construction<\/strong> is a decisive step in the <strong>Injection moulding process<\/strong>. It directly affects the quality of the parts produced, their repeatability, manufacturing costs and the ability to ensure <strong>mass production<\/strong> Reliable and cost-effective.<\/p>\n<p>The <strong>Plastic injection molding<\/strong> is today one of the most widely used industrial processes for manufacturing parts from <strong>Plastic<\/strong> intended for a <strong>wide range<\/strong> sectors: automotive, medical, electronics, industrial, construction, or consumer goods. It relies on the use of <strong>injection moulding machines<\/strong> and of <strong>injection moulding machines<\/strong> capable of injecting <strong>molten plastic<\/strong> under high pressure in a specially designed mould.<\/p>\n<p>On this page, we detail the role of the mould, its various components, the steps of the <strong>mould making<\/strong> and best practices for <strong>avoid defects<\/strong> during production.<\/p>\n<hr \/>\n<h2>Understanding injection moulding<\/h2>\n<h3>Principle of injection moulding<\/h3>\n<h3>Injection<\/h3>\n<p>The <strong>injection molding<\/strong> consists of transforming plastic granules into finished parts through a precise industrial cycle. The plastic material is heated in the <strong>moulding machine<\/strong> until it reaches a molten state. This molten plastic is then injected under pressure into the mould cavity, where it perfectly takes on the defined shape.<\/p>\n<p>After injection, the part is cooled, solidified, then ejected before a new cycle begins. This <strong>moulding process<\/strong> is fully automated and allows for rapid and repeatable production.<\/p>\n<h3>Why is plastic injection favoured in industrial production?<\/h3>\n<p>The<strong>plastic injection moulding<\/strong> offers many advantages:<\/p>\n<ul>\n<li>Mass production at controlled cost<\/li>\n<li>high dimensional precision<\/li>\n<li>High repeatability<\/li>\n<li>Manufacture of complex parts<\/li>\n<li>Compatibility with a wide range of materials<\/li>\n<\/ul>\n<p>\ud83d\udc49 To find out more, see our <a href=\"https:\/\/hybster.com\/en\/documentation\/injection-moulding-guide\/\"><strong>Complete guide to plastic injection moulding<\/strong>.<\/a><\/p>\n<hr \/>\n<h2>The strategic role of the mould in plastic injection<\/h2>\n<h3>Why is mould design crucial?<\/h3>\n<p>the <strong>Mould design<\/strong> is a strategic step that influences:<\/p>\n<ul>\n<li>The final quality of the parts<\/li>\n<li>the lifespan of the mould<\/li>\n<li>cycle times<\/li>\n<li>the ability to <strong>avoid defects<\/strong> (blisters, smears, burns, weld lines)<\/li>\n<\/ul>\n<p>An optimised design ensures homogenous filling, uniform cooling and damage-free ejection of the part.<\/p>\n<h3>Impact of the mould on costs and productivity<\/h3>\n<p>A well-designed mould reduces:<\/p>\n<ul>\n<li>Waste<\/li>\n<li>the consumption of plastic material<\/li>\n<li>machine stops<\/li>\n<li>the cost per piece<\/li>\n<\/ul>\n<p>It also guarantees better exploitation of the <strong>injection moulding machines<\/strong> and a better industrial yield.<\/p>\n<hr \/>\n<h2>Plastic injection mould construction<\/h2>\n<h3>The footprint: cavity and core<\/h3>\n<p>The mould is the central element of the plastic injection mould. It is formed by:<\/p>\n<ul>\n<li>the <strong>cavity<\/strong> female part<\/li>\n<li>the <strong>Core<\/strong> Male part<\/li>\n<\/ul>\n<p>Together, they define the final geometry of the part. During injection, the molten plastic fills the space between the cavity and the core. The study of the plastic flow in this mould is called <strong>rheology<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-6638\" src=\"https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-3-e1717856497124-300x259.png\" alt=\"Plastic injection mould design, mould maker, plastic mould manufacturing, plastic mould France\" width=\"300\" height=\"259\" srcset=\"https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-3-e1717856497124-300x259.png 300w, https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-3-e1717856497124-14x12.png 14w, https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-3-e1717856497124.png 364w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<h4>Materials used for mould cavities<\/h4>\n<p>According to the <strong>production volumes<\/strong> and the technical constraints, the prints can be made in:<\/p>\n<ul>\n<li>hardened steels (large series)<\/li>\n<li>pre-treated steels<\/li>\n<li>Copper alloys<\/li>\n<li><strong>Aluminium moulds<\/strong> (prototypes and small runs)<\/li>\n<\/ul>\n<p>The<strong>CNC machining<\/strong> ensures the necessary accuracy for the manufacture of these impressions.<\/p>\n<hr \/>\n<h3>The mould frame or chassis<\/h3>\n<p>The carcass, or frame, constitutes the load-bearing structure of the mould. It ensures:<\/p>\n<ul>\n<li>stiffness<\/li>\n<li>the component alignment<\/li>\n<li>resistance to the forces exerted by moulding machines<\/li>\n<\/ul>\n<p>There are standard chassis and custom-built chassis, depending on the level of requirements and the desired industrial pace.<\/p>\n<figure id=\"attachment_6641\" aria-describedby=\"caption-attachment-6641\" style=\"width: 300px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-6641\" src=\"https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-4-e1717856759572-300x259.png\" alt=\"Plastic injection mould making in France, mould making France, injection mould frame, mould maker France.\" width=\"300\" height=\"259\" srcset=\"https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-4-e1717856759572-300x259.png 300w, https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-4-e1717856759572-14x12.png 14w, https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-4-e1717856759572.png 364w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-6641\" class=\"wp-caption-text\">#image_title<\/figcaption><\/figure>\n<hr \/>\n<h3>The feeding channel system<\/h3>\n<p>The <strong>runners and gate system<\/strong> allows the molten plastic to be conveyed from the machine's nozzle to the cavities. It comprises:<\/p>\n<ul>\n<li>the sprue<\/li>\n<li>distribution channels<\/li>\n<li>injection gates<\/li>\n<\/ul>\n<p>A well-designed system ensures homogeneous distribution of matter and limits losses.<\/p>\n<p>\ud83d\udc49 Learn more about the <strong>Plastic injection feeding system<\/strong>.<\/p>\n<figure id=\"attachment_6642\" aria-describedby=\"caption-attachment-6642\" style=\"width: 300px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-6642\" src=\"https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-5-e1717857040619-300x259.png\" alt=\"plastic injection mould plastic injection gate plastic injection sprue multi-cavity mould\" width=\"300\" height=\"259\" srcset=\"https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-5-e1717857040619-300x259.png 300w, https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-5-e1717857040619-14x12.png 14w, https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-5-e1717857040619.png 364w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-6642\" class=\"wp-caption-text\">#image_title<\/figcaption><\/figure>\n<hr \/>\n<h3>The ejection system<\/h3>\n<p>Once the part has cooled, the ejection system allows it to be removed from the mould without deformation. It can be comprised of:<\/p>\n<ul>\n<li>Cylindrical ejectors pins<\/li>\n<li>Tubular ejectors (core pins)<\/li>\n<li>Blade ejector<\/li>\n<li>Form ejectors<\/li>\n<li>stripper plates (stripping machine)<\/li>\n<li>Hydraulic lifters<\/li>\n<li>Lifters<\/li>\n<\/ul>\n<p>An effective ejection system is essential for <strong>avoid defects<\/strong> and ensure continuous production.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-6643\" src=\"https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-6-e1717857312605-300x259.png\" alt=\"ejector mould plastic injection mould ejection plastic part mould maker france mould manufacturing in france plastic injection mould maker\" width=\"300\" height=\"259\" srcset=\"https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-6-e1717857312605-300x259.png 300w, https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-6-e1717857312605-14x12.png 14w, https:\/\/hybster.com\/wp-content\/uploads\/Untitled-design-6-e1717857312605.png 364w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<hr \/>\n<h3>The cooling system<\/h3>\n<p>The <strong>Cooling system<\/strong> is a key factor in productivity. It allows for:<\/p>\n<ul>\n<li>reduce cycle time<\/li>\n<li>limit deformations<\/li>\n<li>improve dimensional stability<\/li>\n<\/ul>\n<p>Modern technologies include conformal cooling, sometimes achieved through<strong>3D printing<\/strong>, to more closely follow the geometry of the part.<\/p>\n<hr \/>\n<h2>Plastic injection mould manufacturing<\/h2>\n<h3>Manufacturing steps<\/h3>\n<p>the <strong>mould making<\/strong> is based on several steps:<\/p>\n<ul>\n<li>Precision CNC machining<\/li>\n<li>Electrical discharge machining<\/li>\n<li>manual adjustment<\/li>\n<li>Polishing<\/li>\n<li>metrological controls<\/li>\n<\/ul>\n<p>Each stage aims to ensure the quality and durability of the mould.<\/p>\n<h3>Contribution of 3D printing<\/h3>\n<p>The<strong>3D printing<\/strong> allows today the manufacture of:<\/p>\n<ul>\n<li>technical inserts<\/li>\n<li>complex cooling circuits<\/li>\n<li>working prototypes<\/li>\n<\/ul>\n<p>It effectively complements traditional methods.<\/p>\n<hr \/>\n<h2>Types of plastic injection moulds<\/h2>\n<p>There are different <strong>Types of moulds<\/strong> :<\/p>\n<ul>\n<li>single-impression mould<\/li>\n<li>multi-cavity moulds<\/li>\n<li>Family mussels<\/li>\n<li>drawer moulds or unscrewing<\/li>\n<li>Wallet mould<\/li>\n<li>tandem mussels<\/li>\n<\/ul>\n<p>The choice mainly depends on <strong>production volumes<\/strong>, from the geometry of the parts and economic constraints.<\/p>\n<hr \/>\n<h2>Plastic injection moulding machines and presses<\/h2>\n<p>The <strong>injection moulding machines<\/strong> and <strong>injection moulding machines<\/strong> ensure the closing of the mould, the injection of molten plastic and the ejection of the parts. The sizing of the press is essential to guarantee a stable and safe cycle.<\/p>\n<hr \/>\n<h2>Best practices for avoiding moulding defects<\/h2>\n<p>Pour <strong>avoid defects<\/strong> In plastic injection moulding, it is essential to:<\/p>\n<ul>\n<li>optimise mould design<\/li>\n<li>mastering machine parameters<\/li>\n<li>ensure uniform cooling<\/li>\n<li><a href=\"https:\/\/hybster.com\/en\/plastics\/\">Choose the appropriate plastic material<\/a><\/li>\n<li>regularly check the condition of the mould<\/li>\n<\/ul>\n<hr \/>\n<h2>Conclusion: mastering the construction of a plastic injection mould<\/h2>\n<p>the <strong>Plastic injection mould construction<\/strong> is a major driver of industrial performance. Rigorous design, controlled manufacturing, and optimised operation ensure quality, productivity, and profitability.<\/p>\n<p>\ud83d\udc49 <strong>Hybster<\/strong>, a specialist in plastics processing and plastic injection in Lille, will support you with your projects, from mould design to series production.<br \/>\nAlso discover our <a href=\"https:\/\/hybster.com\/en\/documentation\/injection-moulding-guide\/\"><strong>Plastic injection guide<\/strong>.<\/a><\/p>\n<\/div>","protected":false},"author":20,"featured_media":6638,"template":"","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false},"famille-de-documentation":[],"class_list":["post-6637","documentation","type-documentation","status-publish","has-post-thumbnail","hentry"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.6.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hybster : Guide pratique pour comprendre comment fonctionne un moule d&#039;injection plastique. 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