{"id":1339,"date":"2026-03-04T14:08:46","date_gmt":"2026-03-04T14:08:46","guid":{"rendered":"https:\/\/www.atc-mould.com\/?p=1339"},"modified":"2026-03-04T14:08:46","modified_gmt":"2026-03-04T14:08:46","slug":"how-to-prevent-burn-marks-on-injection-moulded-parts","status":"publish","type":"post","link":"https:\/\/www.atc-mould.com\/?p=1339","title":{"rendered":"How to Prevent Burn Marks on Injection Moulded Parts?"},"content":{"rendered":"\n<p>Burn marks (also known as burn marks or scorching) in injection molded parts are a common defect, primarily caused by poor mold venting, excessively high injection speed, overly high melt temperature, or trapped air\/gases being compressed and ignited.<\/p>\n\n\n\n<p>To effectively prevent burn marks in injection molded parts, optimize from the following aspects:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Optimize mold venting<\/strong>: Add vent slots (depth 0.01\u20130.03 mm) at the mold ends and areas prone to gas entrapment to ensure smooth gas escape. Regularly clean vent channels to prevent blockages.<\/li>\n\n\n\n<li><strong>Adjust process parameters<\/strong>: Reduce injection speed (especially using slower filling in the final stage), lower melt temperature by 10\u201320\u00b0C, and appropriately decrease injection pressure to avoid excessive air compression.<\/li>\n\n\n\n<li><strong>Material handling<\/strong>: Ensure raw materials are thoroughly dried (moisture content &lt;0.2%) to prevent moisture vaporization from generating gases. Select resins with moderate flowability.<\/li>\n\n\n\n<li><strong>Mold design improvements<\/strong>: Reasonably position and size gates to avoid sharp corners or dead zones. When necessary, adopt vacuum venting or gas-assisted injection molding.<\/li>\n<\/ol>\n\n\n\n<p>By implementing these preventive measures, you can significantly improve the surface quality of injection molded parts and reduce scrap rates.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Burn marks (also known as burn marks or scorching) in injection molded parts are a common defect, primarily caused by poor mold venting, excessively high injection speed, overly high melt temperature, or trapped air\/gases being compressed and ignited. To effectively prevent burn marks in injection molded parts, optimize from the following aspects: By implementing these [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1066,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1339","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.atc-mould.com\/index.php?rest_route=\/wp\/v2\/posts\/1339","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.atc-mould.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.atc-mould.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.atc-mould.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.atc-mould.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1339"}],"version-history":[{"count":1,"href":"https:\/\/www.atc-mould.com\/index.php?rest_route=\/wp\/v2\/posts\/1339\/revisions"}],"predecessor-version":[{"id":1340,"href":"https:\/\/www.atc-mould.com\/index.php?rest_route=\/wp\/v2\/posts\/1339\/revisions\/1340"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.atc-mould.com\/index.php?rest_route=\/wp\/v2\/media\/1066"}],"wp:attachment":[{"href":"https:\/\/www.atc-mould.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1339"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.atc-mould.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1339"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.atc-mould.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}