{"id":7702,"date":"2025-08-27T09:00:00","date_gmt":"2025-08-27T08:00:00","guid":{"rendered":"https:\/\/uplastech.com\/scientific-molding-five-tests\/"},"modified":"2025-08-27T09:00:00","modified_gmt":"2025-08-27T08:00:00","slug":"scientific-molding-five-tests","status":"publish","type":"post","link":"https:\/\/uplastech.com\/ko\/scientific-molding-five-tests\/","title":{"rendered":"Scientific Molding: The Five Studies and Why the Order Matters"},"content":{"rendered":"<style>\n.upl-blog{font-size:17px;line-height:1.78;color:#1f2937}\n.upl-blog p{margin:0 0 18px}\n.upl-blog h2{font-size:26px;line-height:1.3;color:#0b2b33;margin:46px 0 14px;font-weight:700;letter-spacing:-.015em}\n.upl-blog h3{font-size:19.5px;color:#0d3b47;margin:28px 0 10px;font-weight:700}\n.upl-blog ul,.upl-blog ol{margin:0 0 20px;padding-left:22px}\n.upl-blog li{margin:0 0 9px}\n.upl-blog figure{margin:0 0 34px}\n.upl-blog figure img{width:100%;height:auto;display:block;border-radius:10px}\n.upl-blog figcaption{font-size:13px;color:#6b7280;margin-top:10px;line-height:1.5}\n.upl-blog .toc{background:none;border:0;border-radius:0;padding:0;margin:0 0 34px}\n.upl-blog .toc .lwptoc{margin:0}\n.upl-blog .toc h4{margin:0 0 10px;font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#0d5563}\n.upl-blog .toc ol{margin:0;padding-left:18px;font-size:14.5px}\n.upl-blog .toc li{margin-bottom:6px}\n.upl-blog table{width:100%;border-collapse:collapse;font-size:14.5px;margin:0 0 10px}\n.upl-blog th{background:#0d3b47;color:#fff;text-align:left;padding:11px 13px;font-weight:600;font-size:13.5px;border:0}\n.upl-blog td{padding:11px 13px;border:0;border-bottom:1px solid #e8ebed;vertical-align:top}\n.upl-blog tbody tr:nth-child(even){background:#fafbfc}\n.upl-blog .tablecap{font-size:12.5px;color:#6b7280;margin:0 0 30px}\n.upl-blog .myth{background:#fff8ef;border:1px solid #f6ddbd;border-radius:8px;padding:16px 20px;margin:0 0 26px;font-size:15.5px}\n.upl-blog .myth b{color:#a85c10}\n.upl-blog .callout{background:#f2f8f9;border-radius:8px;padding:18px 22px;margin:0 0 26px;font-size:15.5px;border-left:3px solid #14707f}\n.upl-blog .faq h3{border-top:1px solid #eceff1;padding-top:22px;margin-top:0;font-size:18px}\n.upl-blog .faq h3:first-of-type{border-top:0;padding-top:0}\n.upl-blog .cta{background:linear-gradient(135deg,#0b2b33,#0d5563);color:#fff;border-radius:12px;padding:34px;margin:48px 0 30px}\n.upl-blog .cta h2,.upl-blog .cta .cta-h{color:#fff;margin:0 0 10px;font-size:24px;font-weight:700;line-height:1.3}\n.upl-blog .cta p{color:#c9dee3;margin:0 0 20px;font-size:16px}\n.upl-blog .btn{display:inline-block;background:#e07a1f;color:#fff;text-decoration:none;font-weight:700;padding:13px 26px;border-radius:8px;font-size:15.5px}\n.upl-blog .rel{border-top:1px solid #e8ebed;margin-top:40px;padding-top:26px}\n.upl-blog .rel h4{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#6b7280;margin:0 0 14px}\n.upl-blog .rel ul{list-style:none;padding:0;margin:0}\n.upl-blog .rel li{padding:11px 0;border-bottom:1px dashed #e8ebed}\n.upl-blog .rel a{text-decoration:none;font-weight:600;font-size:15.5px}\n@media(max-width:640px){.upl-blog h2{font-size:22px}.upl-blog table{font-size:13px}.upl-blog .cta{padding:24px}}\n\/* \u5355\u7bc7\u9875\u9690\u85cf WhatsApp \u81ea\u52a8\u5c55\u5f00\u7684\u95ee\u5019\u5361\uff0c\u53ea\u4fdd\u7559\u5706\u5f62\u6c14\u6ce1\uff0c\u907f\u514d\u906e\u6321\u4fa7\u680f\u8be2\u76d8\u63d0\u4ea4\u6309\u94ae *\/\nbody.single-post .ht_ctc_chat_greetings_box{display:none !important}\n<\/style>\n<div class=\"upl-blog\">\n<figure>\n<img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/uplastech.com\/wp-content\/uploads\/2026\/10\/scientific-molding-five-tests.jpg\" alt=\"Panel of five injection molding process curves used in a scientific molding study\" width=\"1536\" height=\"909\"><figcaption>Five studies, five curves. Each one isolates a single variable so that the next one has a stable base to measure against.<\/figcaption><\/figure>\n<div class=\"toc\"><\/div>\n<h2 id=\"why\">Why five tests and not one<\/h2>\n<p>Scientific molding is often described as a philosophy. In practice it is a fixed sequence of five studies, run in a fixed order, each of which answers one question and depends on the answer to the one before it. Skip a step and the later numbers are meaningless.<\/p>\n<p>The sequence exists because injection molding variables interact. You cannot find the gate freeze time before the cavity is balanced, because an unbalanced cavity never reaches a stable weight. You cannot balance cavities before you know the pressure drop, because the imbalance may be a fill-rate effect rather than a tool defect.<\/p>\n<table>\n<thead>\n<tr>\n<th>#<\/th>\n<th>Study<\/th>\n<th>Question it answers<\/th>\n<th>Output<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>Rheology<\/td>\n<td>What fill time gives the most stable process?<\/td>\n<td>Viscosity curve, optimum fill time<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>Pressure drop<\/td>\n<td>Where does the pressure go?<\/td>\n<td>Pressure at transfer, gate seal pressure<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>Cavity balance<\/td>\n<td>Do all cavities fill at the same time and pressure?<\/td>\n<td>Short-shot and pressure balance across cavities<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>Gate freeze<\/td>\n<td>How long must hold be applied?<\/td>\n<td>Hold time at the weight plateau<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>\ub0c9\uac01<\/td>\n<td>How long until the part is rigid enough?<\/td>\n<td>Cooling time, heat load, cycle<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 1 \u2014 The five studies and their order. Each depends on the previous one being complete, which is why the sequence is not negotiable.<\/p>\n<div class=\"callout\">\n<p><strong>Order matters more than method.<\/strong> A gate freeze study run on an unbalanced tool will produce a plateau that shifts every time the imbalance shifts. The number looks clean and means nothing.<\/p>\n<\/div>\n<h2 id=\"rheology\">Study 1: the rheology curve<\/h2>\n<p>The rheology study fills the part at a series of different fill times \u2014 typically six to ten \u2014 holding everything else constant, and records the pressure required at transfer for each. The result is a U-shaped curve: too fast and shear heating thins the melt, too slow and the melt cools and thickens.<\/p>\n<table>\n<thead>\n<tr>\n<th>Fill time (s)<\/th>\n<th>Pressure at transfer (bar)<\/th>\n<th>Observation<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0.35<\/td>\n<td>720<\/td>\n<td>Shear thinning; flash risk at the gate<\/td>\n<\/tr>\n<tr>\n<td>0.50<\/td>\n<td>660<\/td>\n<td>Still on the fast side<\/td>\n<\/tr>\n<tr>\n<td>0.70<\/td>\n<td>620<\/td>\n<td>Near the minimum<\/td>\n<\/tr>\n<tr>\n<td>0.90<\/td>\n<td>615<\/td>\n<td>Minimum \u2014 the stable window<\/td>\n<\/tr>\n<tr>\n<td>1.20<\/td>\n<td>640<\/td>\n<td>Slight rise as melt cools<\/td>\n<\/tr>\n<tr>\n<td>1.60<\/td>\n<td>700<\/td>\n<td>Cooling dominates<\/td>\n<\/tr>\n<tr>\n<td>2.20<\/td>\n<td>810<\/td>\n<td>Short-shot risk<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 2 \u2014 A typical rheology curve for an ABS part. The flat bottom is the operating window; the process should sit in the middle of it, not at the edge.<\/p>\n<p>The point of the study is not to find the lowest pressure. It is to find the flat portion of the curve, because a process sitting on a slope has no tolerance for variation. A 5% change in fill time on the steep part of the curve moves pressure by 40 bar; on the flat part it moves it by 5. Only one of those is a process you can leave running.<\/p>\n<p>Practical range: most studies bracket 0.3 s to 3 s, or roughly the natural fill time of the part \u00b160%. Below 0.3 s the machine cannot control the velocity profile accurately; above 3 s the melt front has cooled enough that the numbers stop meaning anything.<\/p>\n<h2 id=\"pressure-drop\">Study 2: the pressure drop study<\/h2>\n<p>With the fill time fixed from study 1, the pressure drop study measures how much of the available pressure is used getting the melt from the nozzle to the end of the cavity. It is done by filling to a series of short-shot positions and recording the pressure at each.<\/p>\n<table>\n<thead>\n<tr>\n<th>Pressure consumed in<\/th>\n<th>Typical share<\/th>\n<th>What a high value means<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Nozzle and sprue<\/td>\n<td>5 \u2013 15%<\/td>\n<td>Undersized sprue, cold slug<\/td>\n<\/tr>\n<tr>\n<td>Runner system<\/td>\n<td>15 \u2013 35%<\/td>\n<td>Runners too small, long flow path<\/td>\n<\/tr>\n<tr>\n<td>Gate<\/td>\n<td>10 \u2013 25%<\/td>\n<td>Gate too small; high shear at the gate<\/td>\n<\/tr>\n<tr>\n<td>Cavity fill<\/td>\n<td>30 \u2013 50%<\/td>\n<td>Thin walls, long flow length<\/td>\n<\/tr>\n<tr>\n<td>Packing<\/td>\n<td>10 \u2013 20%<\/td>\n<td>Needed to compensate shrinkage<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 3 \u2014 Where injection pressure goes. If the nozzle and runner together take more than half, the tool is fighting the machine and no process setting will fix it.<\/p>\n<p>The study also establishes the pressure at transfer, which becomes the upper limit for the pack pressure in study 4. Pack pressure is normally set at 50\u201380% of the pressure at transfer; setting it above that just holds the screw against a frozen gate and wastes energy.<\/p>\n<p>The most useful single number from this study is the pressure at the end of fill. If it is above 80% of the machine's rated injection pressure, the process has no headroom and will drift as the melt viscosity changes through the shift. That is a tool or machine problem, and it is better discovered during qualification than in production.<\/p>\n<h2 id=\"balance\">Study 3: the cavity balance study<\/h2>\n<p>For a multi-cavity tool, the balance study determines whether all cavities fill at the same time and reach the same pressure. It is done with a short-shot series: fill to 90%, 95%, 98% and 100%, and see which cavities are full at each stage.<\/p>\n<table>\n<thead>\n<tr>\n<th>Result<\/th>\n<th>Interpretation<\/th>\n<th>\uc561\uc158<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>All cavities short at the same fill %<\/td>\n<td>Balanced<\/td>\n<td>None<\/td>\n<\/tr>\n<tr>\n<td>One cavity always fills first<\/td>\n<td>Runner or gate imbalance<\/td>\n<td>Adjust gate size; check runner diameters<\/td>\n<\/tr>\n<tr>\n<td>Imbalance changes with fill rate<\/td>\n<td>Shear-dependent imbalance<\/td>\n<td>Re-run at the production fill time<\/td>\n<\/tr>\n<tr>\n<td>Imbalance appears only at high pack<\/td>\n<td>Gate freeze imbalance<\/td>\n<td>Check gate land lengths<\/td>\n<\/tr>\n<tr>\n<td>Weight spread under 2%<\/td>\n<td>Acceptable for most work<\/td>\n<td>None<\/td>\n<\/tr>\n<tr>\n<td>Weight spread over 5%<\/td>\n<td>Not acceptable<\/td>\n<td>Tool correction<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 4 \u2014 Reading a cavity balance study. An imbalance that changes with fill rate is a rheological problem, not a tool geometry problem, and correcting the steel will not fix it.<\/p>\n<p>The acceptance criterion is usually a weight spread of under 2% across cavities, measured on parts from a single shot after the process has stabilised. Some industries accept 1%; very few accept more than 3%. Beyond that, the parts are effectively coming from different processes and downstream assembly will show it.<\/p>\n<h2 id=\"gate-freeze\">Study 4: the gate freeze study<\/h2>\n<p>Gate freeze is the moment the gate solidifies and no more material can enter the cavity. After that point, additional hold time does nothing except keep the screw forward. The study finds that moment by running a series of shots at increasing hold time and weighing the parts.<\/p>\n<table>\n<thead>\n<tr>\n<th>Hold time (s)<\/th>\n<th>Part weight (g)<\/th>\n<th>Gate state<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1.0<\/td>\n<td>24.82<\/td>\n<td>Open \u2014 heavy sink<\/td>\n<\/tr>\n<tr>\n<td>2.0<\/td>\n<td>25.31<\/td>\n<td>Open<\/td>\n<\/tr>\n<tr>\n<td>3.0<\/td>\n<td>25.64<\/td>\n<td>Closing<\/td>\n<\/tr>\n<tr>\n<td>4.0<\/td>\n<td>25.78<\/td>\n<td>Nearly closed<\/td>\n<\/tr>\n<tr>\n<td>5.0<\/td>\n<td>25.81<\/td>\n<td>Frozen<\/td>\n<\/tr>\n<tr>\n<td>6.0<\/td>\n<td>25.82<\/td>\n<td>Frozen<\/td>\n<\/tr>\n<tr>\n<td>8.0<\/td>\n<td>25.82<\/td>\n<td>Frozen<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 5 \u2014 A weight plateau. The plateau is the answer: hold time should be set at the first point where the weight stops rising, plus a small safety margin.<\/p>\n<p>Two rules follow. First, hold time set below the plateau leaves the part under-packed and the weight varies with every small change in melt viscosity. Second, hold time set well above the plateau adds cycle time for nothing \u2014 and on a 25-second cycle, 3 seconds of wasted hold is 12% of capacity.<\/p>\n<p>The plateau method needs a balance readable to 0.01 g and parts weighed after they have cooled to room temperature. Weighing warm parts gives a reading that drifts with the cooling, which flattens the plateau and makes it look as though gate freeze happened earlier than it did.<\/p>\n<h2 id=\"cooling\">Study 5: the cooling study<\/h2>\n<p>The cooling study determines how long the part must stay in the tool to be rigid enough to eject without distortion. It is done by reducing cooling time in steps and inspecting the parts for ejection marks, warpage and dimensional change.<\/p>\n<table>\n<thead>\n<tr>\n<th>\ub0c9\uac01 \uc2dc\uac04<\/th>\n<th>Part condition on ejection<\/th>\n<th>Verdict<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>60% of nominal<\/td>\n<td>Ejector marks, bowing within minutes<\/td>\n<td>Too short<\/td>\n<\/tr>\n<tr>\n<td>75%<\/td>\n<td>No marks, but dimensions drift after 1 h<\/td>\n<td>Too short for tolerance parts<\/td>\n<\/tr>\n<tr>\n<td>90%<\/td>\n<td>Stable within 30 min<\/td>\n<td>Minimum for most work<\/td>\n<\/tr>\n<tr>\n<td>100%<\/td>\n<td>Stable on ejection<\/td>\n<td>Nominal<\/td>\n<\/tr>\n<tr>\n<td>120%<\/td>\n<td>No improvement<\/td>\n<td>Wasted cycle time<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 6 \u2014 Cooling study results. The correct setting is the shortest time that gives stable dimensions, not the time that gives the best-looking part off the tool.<\/p>\n<p>The cooling study also gives the heat load, which is what the machine's cooling capacity has to remove. Heat load is part weight \u00d7 enthalpy change \u00f7 cycle time, and comparing it with the chiller capacity explains a class of problems that look like process instability but are actually a warm mould.<\/p>\n<h2 id=\"together\">What the five give you together<\/h2>\n<p>Run in sequence, the five studies produce a process window rather than a process setting. That distinction is the whole point. A setting works until something changes; a window tells you how far you can move before quality is affected, and therefore which variations you can absorb and which you cannot.<\/p>\n<p>The window also makes the process portable. A documented window \u2014 fill time range, pressure at transfer, pack pressure range, hold time, cooling time \u2014 can be transferred to another machine of the same tonnage and reproduced. A recipe of setpoints cannot, because the same numbers on a different machine produce a different cavity pressure.<\/p>\n<h2 id=\"diy\">Doing it without a consultant<\/h2>\n<p>All five studies need a machine, a balance, a stopwatch and a way to read pressure at transfer. They do not need a cavity pressure sensor, although one makes studies 2 and 4 faster and more precise. A plant that runs the sequence once per tool and records the results has most of the benefit of a formal scientific molding programme.<\/p>\n<p>The time cost is real: half a day to a day per tool for the full sequence, plus the material consumed. Against that, the first production run after qualification typically saves more than that in reduced debugging, and the tool's process window is documented once rather than rediscovered every time the job returns to the press.<\/p>\n<div class=\"faq\">\n<h3>What are the five scientific molding studies?<\/h3>\n<p>Rheology (fill time versus pressure), pressure drop (where injection pressure is consumed), cavity balance (do all cavities fill equally), gate freeze (how long hold must be applied) and cooling (how long the part must stay in the tool). They are run in that order because each depends on the previous one.<\/p>\n<h3>Why must they be run in that order?<\/h3>\n<p>Because the later studies assume a stable base. A gate freeze plateau measured on an unbalanced tool moves whenever the imbalance moves. A balance study run at the wrong fill time measures a shear effect rather than a tool defect. The sequence removes one variable at a time.<\/p>\n<h3>How long does a full study take?<\/h3>\n<p>Half a day to a full day per tool, including set-up and material. Studies 1 and 4 take the longest because they need six to eight data points each with a stabilised shot in between. Studies 3 and 5 are faster.<\/p>\n<h3>Do I need cavity pressure sensors?<\/h3>\n<p>No, but they help. Gate freeze can be found by weighing parts, and pressure drop can be read from the machine's hydraulic pressure. A cavity sensor makes both faster and gives a direct reading of what the plastic is doing rather than what the hydraulic system is doing.<\/p>\n<h3>What is a good cavity balance?<\/h3>\n<p>Under 2% weight spread across cavities after the process stabilises. Under 1% for precision work. Above 5% the cavities are effectively separate processes and downstream variation will show it.<\/p>\n<h3>How do I know the gate is frozen?<\/h3>\n<p>Part weight stops increasing as hold time increases. Plot weight against hold time and look for the plateau. Set hold time at the first point on the plateau plus a small margin \u2014 not at a round number and not at the machine's maximum.<\/p>\n<h3>Can I skip the rheology study?<\/h3>\n<p>You can, and many plants do, but then the fill time is arbitrary and every later number carries that error. The rheology study is the cheapest of the five and it determines the condition for all the others.<\/p>\n<h3>Does this apply to small tonnage machines?<\/h3>\n<p>Yes. The studies are about the plastic, not the machine size. A 50-tonne press running a single-cavity tool benefits from the same sequence, and the studies take less time because there is less to measure.<\/p>\n<\/div>\n<div class=\"cta\">\n<p class=\"cta-h\">Qualifying a new tool?<\/p>\n<p>Send us the part drawing, the resin and the tool layout. We will tell you what the process window should look like before you run the studies, so you know whether the numbers you get are good or merely repeatable.<\/p>\n<p><a class=\"btn\" href=\"https:\/\/uplastech.com\/ko\/injection-molding\/\">Talk to an injection molding engineer<\/a>\n<\/div>\n<div class=\"rel\">\n<h4>Continue reading<\/h4>\n<ul>\n<li><a href=\"https:\/\/uplastech.com\/ko\/packing-pressure-hold-time\/\">Packing Pressure and Hold Time: How to Set Them From the Part<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/ko\/injection-molding-cooling-time\/\">Injection Molding Cooling Time: Calculation and Verification<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/ko\/injection-molding-defects\/\">Injection Molding Defects: Causes and Fixes<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/ko\/injection-molding-tolerances\/\">Injection Molding Tolerances: What the Process Can Hold<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/ko\/injection-molding-material-selection\/\">Injection Molding Material Selection<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Rheology, pressure drop, cavity balance, gate freeze, cooling. What each study answers, how to run it, and why running them out of sequence wastes the data.<\/p>","protected":false},"author":1,"featured_media":7696,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Scientific Molding: The Five Studies and Why the Order Matte","_seopress_titles_desc":"Rheology, pressure drop, cavity balance, gate freeze, cooling. 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