{"id":262,"date":"2022-07-14T23:16:09","date_gmt":"2022-07-14T15:16:09","guid":{"rendered":"https:\/\/acomold.com\/plastic-injection-molding-troubleshooting-guide.html"},"modified":"2023-07-26T17:40:30","modified_gmt":"2023-07-26T09:40:30","slug":"plastic-injection-molding-troubleshooting-guide","status":"publish","type":"post","link":"https:\/\/www.acomold.com\/plastic-injection-molding-troubleshooting-guide.html","title":{"rendered":"Plastic Injection Molding Troubleshooting Guide"},"content":{"rendered":"<p><strong>Quick link of the Troubleshooting Guide:<\/strong><\/p>\n<table cellpadding=\"5\" cellspacing=\"0\">\n<tbody>\n<tr>\n<td style=\"padding-right:39px\">\n\t\t\t\t1) <a href=\"#dark-brown-spots\">Dark brown spots<\/a><br \/>\n2) <a href=\"#brittle-fracture\">Brittle fracture<\/a><br \/>\n3) <a href=\"#bubbles\">Bubbles (Or Steelyard balance : stranded gas)<\/a><br \/>\n4) <a href=\"#burn-marks\">Burn marks<\/a><br \/>\n5) <a href=\"#plastic-injection-molding-machine-of-mucosa\">Plastic injection molding machine of mucosa<\/a><br \/>\n6) <a href=\"#grain-crack\">Grain crack<\/a><br \/>\n7) <a href=\"#plastic-degradation\">Plastic degradation<\/a><br \/>\n8) <a href=\"#injection-molded-parts-deforms\">Injection molded parts deforms<\/a><br \/>\n9) <a href=\"#injection-molded-cloak\">Injection molded cloak<\/a><br \/>\n10) <a href=\"#injection-molded-parts-does-not-shrink\">Injection molded parts does not shrink<\/a><br \/>\n11) <a href=\"#surface-roughness\">Surface roughness<\/a><br \/>\n12) <a href=\"#silver-streak\">Silver streak<\/a><\/td>\n<td style=\"border-left:1px solid #bbb;padding-left:39px\">\n\t\t\t\t13) <a href=\"#surface-wrinkled-skin-texture\">Surface wrinkled skin texture<\/a><br \/>\n14) <a href=\"#color-distribution\">Color distribution<\/a><br \/>\n15) <a href=\"#fusion-line-location-decline\">Fusion line location decline<\/a><br \/>\n16) <a href=\"#insufficient-filling\">Insufficient filling<\/a><br \/>\n17) <a href=\"#injection-molded-parts-size-differences\">Injection molded parts size differences<\/a><br \/>\n18) <a href=\"#systolic-trace\">Systolic trace<\/a><br \/>\n19) <a href=\"#dirt-marks\">Dirt marks<\/a><br \/>\n20) <a href=\"#sprue-adhesion\">Sprue adhesion<\/a><br \/>\n21) <a href=\"#empty-hole\">Empty hole<\/a><br \/>\n22) <a href=\"#curved-injection-molded-parts\">Curved injection molded parts<\/a><br \/>\n23) <a href=\"#spraying-trace\">Spraying trace<\/a><br \/>\n24) <a href=\"#surface-layer\">Surface layer (peeling)<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong id=\"dark-brown-spots\">Dark brown spots<\/strong><br \/>\nSpots and stripes still visible even the molding parts have the correct color.<\/p>\n<table class=\"table\" style=\"text-align:left\" cellpadding=\"3\" cellspacing=\"0\">\n<tbody>\n<tr class=\"table_head\" style=\"text-align:center;font-weight:bold\">\n<td><\/td>\n<td>\n\t\t\t\tTroubleshooting<\/td>\n<td>\n\t\t\t\tSolution Guide<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"10\">\n\t\t\t\tInjection molding machine<\/td>\n<td>\n\t\t\t\t1. The last production of degradable plastics materials in the<br \/>\ncylinder, screw, valve adapter maybe curing inside the aggregate hot<br \/>\nrunner pipe.<\/td>\n<td>\n\t\t\t\tUse cleaning compounds or high molecular weight PMMA material to clean the injection cylinder unit.<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"4\">\n\t\t\t\t2. Plastic material traps in the cylinder device&#8217;s dead<br \/>\narea or stagnant area, causing it to stay too long in the high<br \/>\ntemperature.<\/td>\n<td>\n\t\t\t\t1. cylinder and screw should be removed and thoroughly clean the surfaces in contact with the polymer melt.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t2. Check whether the nozzle is located correctly in injection cylinder.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t3. Use open or direct type nozzle to replace opening and closing nozzle.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t4. Check the stop valve for cracks, etc. Change a new device if necessary.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t3. Plastic enters the mold cavity too fast causing excessive shear polymer.<\/td>\n<td>\n\t\t\t\tReduce the injection speed.<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"2\">\n\t\t\t\t4. Melt temperature is too high.<\/td>\n<td>\n\t\t\t\t1. Reduce fire zone melt temperature in a feed tank. Check the flow rate if its sufficient for cooling the hopper locking device, adjust the flow rate if necessary.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t2. Reduce the cycle time to increase plastic that is passed by the cylinder device.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t5. Using the incorrect screw surface speed and back pressure, causing the molten plastic over cut.<\/td>\n<td>\n\t\t\t\tUse minimum back pressure and the correct use of the screw surface speed<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t6. Use a correct type of screw design in the process of plastic.<\/td>\n<td>\n\t\t\t\tUse a lower rate of a extrusion screw.<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"4\">\n\t\t\t\tMold<\/td>\n<td>\n\t\t\t\t1. Grease or oil occur within the mold.<\/td>\n<td>\n\t\t\t\tMold and nozzle should be removed and thoroughly cleaned.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t2. Gate is too small.<\/td>\n<td>\n\t\t\t\tIncrease the gate size.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t3. Wall injection molded too thin, so that plastic flow is not sufficient to pass through, so it causes no degradation.<\/td>\n<td>\n\t\t\t\tCheck the correctness and consistency of wall thickness, if necessary, will be modified.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t4. Hot runner mold produces impurities.<\/td>\n<td>\n\t\t\t\tThe hot runner mold aggregates tube completely remove and clean.<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"4\">\n\t\t\t\tPlastic<\/td>\n<td>\n\t\t\t\t1. PVC or other heat-sensitive plastic appear impurities.<\/td>\n<td>\n\t\t\t\tCheck the source of impurities, especially with PVC manufacturing and conveying plastic pipe part.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t2. Excessive heating of the back using the previous materials.<\/td>\n<td>\n\t\t\t\tStrict inspection after the separation of impurities in materials.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t3. Due to the lack of room cleaning or plastic dry cause plastic blended with burnt particles.<\/td>\n<td>\n\t\t\t\tDry cleaning and reuse of some materials.<\/td>\n<\/tr>\n<tr>\n<td>\n\t\t\t\t4. Poor plastic flow characteristics caused by Insufficient lubrication of plastic.<\/td>\n<td>\n\t\t\t\tAdda certain amount of external lubricant (such asZeng0. 05%to0. 1% zinc stearate).<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div align=\"right\">\n\t<a rel=\"nofollow\" href=\"#top\">Top<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Quick link of the Troubleshooting Guide: 1) Dark brown spots 2) Brittle fracture 3) Bubbles (Or Steelyard balance : stranded gas) 4) Burn marks 5) Plastic injection molding machine of mucosa 6) Grain crack 7) Plastic degradation 8) Injection molded parts deforms 9) Injection molded cloak 10) Injection molded parts does not shrink 11) Surface [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7638,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[32,35,36],"class_list":["post-262","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-troubleshooting","tag-basics","tag-how-to","tag-injection-molding-101"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v24.5) - 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