<link rel="stylesheet" type="text/css" href="/view/clientframework/client.css"/> <script type="text/javascript" src="/view/clientframework/client.js"></script> </head> <body height="100%" onload="javascript:initFrame('files/GUID-AF81D74E-1E6A-4372-A98F-87F04B6E95C7.htm','na','index.html',location.hash);javascript:initPage('Cooling problems','Help');javascript:convSymbols();" id="GUID-AF81D74E-1E6A-4372-A98F-87F04B6E95C7"> <div class="head"><div class="head-block"><div class="button-info"><span id="infoline"> </span></div> <div class="ancestry"> </div> <div class="head-text"><h1>Cooling problems</h1></div> </div> </div> <div class="body conbody"><p class="shortdesc">Cooling accounts for 80 percent of the molding cycle and is a crucial phase in successful molding. Critical dimensions, warpage, and surface finish are all affected by cooling conditions, and poorly cooled parts increase cycle time, dimensional problems, and wastage. </p> <p class="p" id="GUID-AF81D74E-1E6A-4372-A98F-87F04B6E95C7__GUID-8503750B-D55C-426A-8847-08606633F6B9">The following sections list common cooling problems and their solutions. </p> </div> <div class="related-links"> <div class="relinfo relchildren"><strong>Topics in this section</strong> <ul class="ullinks"> <li class="link ulchildlink"><strong><a href="GUID-D8F1A55B-76D6-4158-A6FC-03937B9C3DCE.htm">Non-uniform cooling</a></strong><br/> The main problem caused by non-uniform cooling is warpage. </li> <li class="link ulchildlink"><strong><a href="GUID-715C8278-7290-41B2-989C-BDAE22CBBD77.htm">Excessive cycle time</a></strong><br/> The cycle time is the time taken to produce a molded part, which is measured from the start of injection until the end of clamp open time. High cycle times reduce productivity and increase costs. </li> <li class="link ulchildlink"><strong><a href="GUID-E121E3F0-21D9-4FF9-AAFD-63E69D5922F8.htm">Insufficient pump capacity</a></strong><br/> The heat transfer rate is reduced when the flow is laminar instead of turbulent because of an insufficient pump capacity. </li> </ul></div> <div class="familylinks"> <div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="GUID-3E3EFE66-AE31-4E50-831E-5944C5820ED6.htm" title="Molding problems fall into three main categories; modeling, machine settings, and materials. The effects of these choices is far-reaching, ranging from visual defects such as sink marks, so physical defects such as warpage and even financial implications resulting from excessive cycle times or waste from short shots.">Troubleshooting guide</a></div> </div> </div> </body> </html>