{"id":6036,"date":"2017-03-10T08:00:21","date_gmt":"2017-03-10T14:00:21","guid":{"rendered":"https:\/\/www.ulprospector.com\/knowledge\/?p=6036"},"modified":"2023-02-01T10:29:22","modified_gmt":"2023-02-01T16:29:22","slug":"plastic-defects-avoid-injection-molding-bubbles-blisters-sinks-voids","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/6036\/plastic-defects-avoid-injection-molding-bubbles-blisters-sinks-voids\/","title":{"rendered":"Plastic Defects: How to Avoid Common Injection-Molding Issues"},"content":{"rendered":"<p>There are many factors to consider when creating an\u00a0injection-molded part. From design, to creating prototypes, to mold-filling, plenty can go wrong during the injection-molding process. Even once you have a complete piece, it may not turn out right. Bubbles, blisters, sinks, and voids are common issues that cause a part to be rejected.<\/p>\n<p>Some issues to watch for:<\/p>\n<ul>\n<li>Inadequate venting<\/li>\n<li>Material flow pattern design<\/li>\n<li>Gas traveling across the part surface during the fill or pack stage<\/li>\n<li>Melt flow issues<\/li>\n<li>Venturi effect<\/li>\n<li>General-purpose screws with dimensions of 18:1 L\/D or lower<\/li>\n<li>Insufficient plastic<\/li>\n<li>Gate location<\/li>\n<\/ul>\n<p>In the following slideshow, we&#8217;ll look at each of those defects and issues, and some tests and solutions to help address them.<\/p>\n<p><center><iframe loading=\"lazy\" style=\"border: 1px solid #CCC; border-width: 1px; margin-bottom: 5px; max-width: 100%;\" src=\"\/\/www.slideshare.net\/slideshow\/embed_code\/key\/dq5Sc8WlXdMO60\" width=\"595\" height=\"485\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" allowfullscreen=\"allowfullscreen\"> <\/iframe><\/center><\/p>\n<p style=\"text-align: center;\"><strong> <a title=\"Plastic Defects: How to Avoid Common Injection Molding Part Rejection\" href=\"\/\/www.slideshare.net\/ProspectorFromUL\/plastic-defects-how-to-avoid-common-injection-molding-part-rejection\" target=\"_blank\" rel=\"noopener noreferrer\">Plastic Defects: How to Avoid Common Injection Molding Part Rejection<\/a> <\/strong> from <strong><a href=\"\/\/www.slideshare.net\/ProspectorFromUL\" target=\"_blank\" rel=\"noopener noreferrer\">Prospector from UL<\/a><\/strong><\/p>\n<p>Have you encountered any of these issues in your injection-molding projects? Please share your questions and experience with a comment below.<\/p>\n<h3 style=\"margin-bottom: 5px;\">Further Reading:<\/h3>\n<ul>\n<li style=\"margin-bottom: 5px;\"><a href=\"https:\/\/ulprospector.ul.com\/1462\/eliminate-bubbles-voids-sinks-blisters\/\" target=\"_blank\" rel=\"noopener noreferrer\">Eliminate Bubbles, Voids, Sinks &amp; Blisters<\/a><\/li>\n<li style=\"margin-bottom: 5px;\"><a href=\"https:\/\/ulprospector.ul.com\/4727\/pe-overcoming-plastics-injection-molding-problems\/\" target=\"_blank\" rel=\"noopener noreferrer\">Overcoming Plastics Injection Molding Problems<\/a><\/li>\n<li style=\"margin-bottom: 5px;\"><a href=\"https:\/\/ulprospector.ul.com\/3635\/pe-troubleshooting-flipchart-for-plastic-injection-molding\/\" target=\"_blank\" rel=\"noopener noreferrer\">Troubleshooting FlipChart for Plastic Injection Molding<\/a><\/li>\n<\/ul>\n<div style=\"margin-bottom: 5px;\"><\/div>\n<h2 style=\"margin-bottom: 5px;\">Looking for plastic\u00a0materials\u00a0for your injection-molding project?<\/h2>\n<p>Find technical data and order samples from global suppliers in Prospector \u2013 see the current listings in our <a href=\"https:\/\/plastics.ulprospector.com?st=31\" target=\"_blank\" rel=\"noopener noreferrer\">plastics database<\/a>.<\/p>\n<h4>About the Author<\/h4>\n<table style=\"width: 882.546875px;\">\n<tbody>\n<tr>\n<td style=\"width: 255px;\">John Bozzelli<br \/>\n<strong>Injection Molding (IM) Solutions<\/strong><br \/>\n1019 Balfour St.<br \/>\nMidland, MI 48640-3227<br \/>\nPhone: 989-832-2424<br \/>\nFax 989-832-8743<br \/>\nEmail:\u00a0<a href=\"mailto:&#106;&#111;&#104;&#110;&#64;&#115;&#99;&#105;&#101;&#110;&#116;&#105;&#102;&#105;&#99;&#109;&#111;&#108;&#100;&#105;&#110;&#103;&#46;&#99;&#111;&#109;\" data-slimstat-clicked=\"false\" data-slimstat-type=\"2\" data-slimstat-tracking=\"false\" data-slimstat-callback=\"false\">&#106;&#111;&#104;&#110;&#64;&#115;&#99;&#105;&#101;&#110;&#116;&#105;&#102;&#105;&#99;&#109;&#111;&#108;&#100;&#105;&#110;&#103;&#46;&#99;&#111;&#109;<\/a><br \/>\n<a href=\"http:\/\/www.scientificmolding.com\/\" target=\"_blank\" data-slimstat-clicked=\"false\" data-slimstat-type=\"0\" data-slimstat-tracking=\"true\" data-slimstat-callback=\"false\" rel=\"noopener noreferrer\">www.ScientificMolding.com<\/a><\/td>\n<td style=\"width: 624.546875px;\">John Bozzelli is a graduate of Marietta College (BS) and Ohio University (MS). His studies were interrupted for a stint in Vietnam (US Army, Purple Heart; Silver Star). Twenty years in Dow Plastics provided extensive experience in polymer synthesis, development, production, and processing. John has been a seminar leader with RJG Associates, Injection Molding Magazine, University of Wisconsin Milwaukee, General Polymers and John Klees. Competent in resin characterization and analysis, his specialty is practical, hands-on injection molding training with both small and large machines. National recognition has come through ten patents, over 60 papers covering plastics, processing, machine specifications, and over 12 years on the national seminar circuit. Feature articles such as the \u201cProductivity\u201d; by Plastics World and \u201dScientific Molding\u201d by Injection Molding Magazine October, November and December 1997, have highlighted a couple of exemplar case histories. Check out the August 2001 issue for applications of The Universal Set Up Sheet.John is the initiator of Scientific Injection Molding and teaches the plastic\u2019s point of view for design and processing with a passion you will remember. Take some of your valuable time to learn practical molding techniques that improve your profits tomorrow while eliminating the state of \u201dfire fighting\u201c currently found in many molding facilities. Let us keep plastic manufacturing strong in North America.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>There are many factors to consider when creating an\u00a0injection-molded part. From design, to creating prototypes, to mold-filling, plenty can go wrong during the injection-molding process. Even once you have a complete piece, it may not turn out right. Bubbles, blisters, &hellip; <a href=\"https:\/\/ulprospector.ul.com\/6036\/plastic-defects-avoid-injection-molding-bubbles-blisters-sinks-voids\/\">Continued<\/a><\/p>\n","protected":false},"author":20,"featured_media":6044,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"episode_type":"","audio_file":"","podmotor_file_id":"","podmotor_episode_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","footnotes":""},"categories":[29,21],"tags":[214,237,242,276],"ppma_author":[1237],"class_list":{"0":"post-6036","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-processing","8":"category-plastics-2","9":"tag-plastics","10":"tag-formulation-challenge","11":"tag-injection-molding","12":"tag-processing","13":"entry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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