{"id":38018,"date":"2026-02-25T20:00:00","date_gmt":"2026-02-25T12:00:00","guid":{"rendered":"https:\/\/zetarmold.com\/?p=38018"},"modified":"2026-04-04T10:14:45","modified_gmt":"2026-04-04T02:14:45","slug":"spuitgietmatrijs-met-meerdere-caviteiten","status":"publish","type":"post","link":"https:\/\/zetarmold.com\/nl\/spuitgietmatrijs-met-meerdere-caviteiten\/","title":{"rendered":"Wat komt er kijken bij een offerte voor een spuitgietmatrijs en hoe kun je de beste prijs krijgen?"},"content":{"rendered":"<style>\nsup a.footnote-ref { color: #1a8fc4; text-decoration: none; font-weight: 600; }\nsup a.footnote-ref:hover { text-decoration: underline; }\n.footnotes a { color: #1a8fc4; }\n<\/style>\n<div class=\"callout-key\" style=\"background:#f0f7ff; border-left:4px solid #2563eb; padding:1em 1.2em; border-radius:6px; margin:1.5em 0;\">\n  <strong>Belangrijkste opmerkingen<\/strong><br \/>\n  Bij ZetarMold gebruiken we<br \/>\n  \u2013 Cavity counts typically range from 2 to 128+, chosen based on annual volume, part size, and press tonnage.<br \/>\n  \u2013 Balanced runner design and uniform cooling are the two biggest factors in achieving consistent part quality across all cavities.<br \/>\n  \u2013 Upfront tooling cost is higher than a single-cavity mold, but ROI often pays back within the first production run on high-volume programs.<br \/>\n  \u2013 ZetarMold routinely builds multi-cavity tools up to 128 cavities with cavity-to-cavity weight variation under 1%.\n<\/div>\n<h2>What Exactly Is a Multiple Cavity Injection Mold?<\/h2>\n<p>A multiple cavity injection mold is a tool that contains two or more identical cavities machined into the same mold base, allowing the press to produce multiple parts with every cycle. Instead of one shot yielding one part, a 16-cavity mold delivers 16 parts per shot\u2014same resin, same cycle time, fraction of the cost per piece.<\/p>\n<p>In our factory at ZetarMold, we classify molds by cavity count: single-cavity (1), low multi-cavity (2\u20138), medium multi-cavity (16\u201332), and high multi-cavity (64\u2013128+). The right category depends on your annual volume target, <a href=\"https:\/\/zetarmold.com\/nl\/ontwerp-plastic-precisie-spuitgietmatrijs\/\">part geometry<\/a><sup id=\"fnref1:1\"><a href=\"#fn:1\" class=\"footnote-ref\">1<\/a><\/sup>, and the press size available.<\/p>\n<p>The concept is straightforward, but the engineering behind it is anything but simple. Every cavity must fill at the same time, cool at the same rate, and eject without interference. When done right, a multi-cavity mold is the single most effective way to scale injection molding output without buying more machines.<\/p>\n<h2>What Are the Key Design Parameters of a Multi-Cavity Mold?<\/h2>\n<p>The critical design parameters include cavity layout, runner balance, cooling channel placement, venting, and ejection strategy. Getting any one of these wrong leads to short shots, flash, or dimensional variation between cavities.<\/p>\n<p>We&#8217;ve found that runner balance is the single most debated topic in multi-cavity mold design. There are two main approaches:<\/p>\n<ul>\n<li><b>Naturally balanced (geometrically symmetric) runners<\/b> \u2013 every cavity sits the same flow distance from the <a href=\"https:\/\/zetarmold.com\/nl\/sprue-en-runner\/\">sprue<\/a>. This is the gold standard for consistency but requires more mold real estate.<\/li>\n<li><b>Artificially balanced runners<\/b> \u2013 cavity positions are asymmetric, and balance is achieved by varying runner diameters or gate sizes. This saves mold space but is harder to fine-tune.<\/li>\n<\/ul>\n<table>\n<thead>\n<tr>\n<th>Design Parameter<\/th>\n<th>Typical Range \/ Value<\/th>\n<th>Why It Matters<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Cavity count<\/td>\n<td>2, 4, 8, 16, 32, 64, 128<\/td>\n<td>Directly sets output per cycle<\/td>\n<\/tr>\n<tr>\n<td>Runner type<\/td>\n<td><a href=\"https:\/\/zetarmold.com\/nl\/verschillen-hot-runner-cold-runner-spuitgietmatrijzen\/\">Cold runner<\/a> \/ <a href=\"https:\/\/zetarmold.com\/nl\/voordelen-van-hot-runner-spuitgieten\/\">Hot runner<\/a><\/td>\n<td>Hot runners reduce waste and improve balance<\/td>\n<\/tr>\n<tr>\n<td>Cavity spacing<\/td>\n<td>Minimum 2\u00d7 <a href=\"https:\/\/zetarmold.com\/nl\/spuitgietproces-met-dunne-wand\/\">wanddikte<\/a> between cavities<\/td>\n<td>Prevents thermal crosstalk and structural weakness<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/zetarmold.com\/nl\/verkort-de-koeltijd\/\">Cooling channel<\/a> diameter<\/td>\n<td>6\u201312 mm<\/td>\n<td>Controls <a href=\"https:\/\/zetarmold.com\/nl\/spuitgietproces-5\/\">cyclustijd<\/a> en <a href=\"https:\/\/zetarmold.com\/nl\/factoren-die-vervorming-door-kromtrekken-beinvloeden\/\">kromming<\/a><\/td>\n<\/tr>\n<tr>\n<td>Gate type<\/td>\n<td>Sub-gate, pin gate, valve gate<\/td>\n<td>Affects vestige, balance, and automation<\/td>\n<\/tr>\n<tr>\n<td>Cavity-to-cavity weight variation<\/td>\n<td>&lt; 1\u20132%<\/td>\n<td>Key quality metric for multi-cavity tools<\/td>\n<\/tr>\n<tr>\n<td>Mold steel<\/td>\n<td>P20, H13, S136<\/td>\n<td>Determines mold life and polish capability<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>At ZetarMold, we use <a href=\"https:\/\/zetarmold.com\/nl\/analyse-van-de-matrijsstroming\/\">analyse van de matrijsstroming<\/a><sup id=\"fnref1:2\"><a href=\"#fn:2\" class=\"footnote-ref\">2<\/a><\/sup> \u2013 Op basis van het jaarlijkse volume, de stuksprijsdoelstelling en beschikbare persmaten, adviseren wij een optimaal aantal holtes met ROI-projecties.<\/p>\n<div class=\"claim claim-false\" style=\"background-color: #f7efef; border-color: #f7efef; color: #db6f85;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"\/><line x1=\"15\" y1=\"9\" x2=\"9\" y2=\"15\"\/><line x1=\"9\" y1=\"9\" x2=\"15\" y2=\"15\"\/><\/svg> <b>&#8220;You can simply copy a single-cavity mold layout and duplicate it to create a multi-cavity tool.&#8221;<\/b><span class='claim-true-or-false'>Vals<\/span><\/p>\n<p class='claim-explanation'>A multi-cavity mold requires a completely re-engineered runner system, cooling layout, and <a href=\"https:\/\/zetarmold.com\/nl\/overwegingen-bij-het-spuitgieten-van-uitwerppennen\/\">ejection<\/a> scheme. Simply duplicating cavities without rebalancing the feed system leads to fill imbalance, dimensional variation, and quality defects.<\/p>\n<\/div>\n<div class=\"claim claim-true\" style=\"background-color: #eff2ef; border-color: #eff2ef; color: #5b8c70;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polyline points=\"20 6 9 17 4 12\"\/><\/svg> <b>&#8220;Mold flow simulation is essential for multi-cavity mold design to ensure balanced filling across all cavities.&#8221;<\/b><span class='claim-true-or-false'>Echt<\/span><\/p>\n<p class='claim-explanation'>Simulation reveals fill-time differences, pressure drops, and thermal imbalances between cavities before any steel is cut, allowing engineers to optimize runner sizes and gate locations for uniform filling.<\/p>\n<\/div>\n<h2>Why Does a Multi-Cavity Mold Matter for Production Efficiency?<\/h2>\n<p>A multi-cavity mold matters because it multiplies output without multiplying machine time, labor, or floor space. If your single-cavity mold runs a 20-second cycle, switching to an 8-cavity tool gives you 8\u00d7 the parts in the same 20 seconds (cycle time may increase slightly\u2014typically 5\u201315%\u2014due to larger shot size and cooling demands, but the net throughput gain is enormous).<\/p>\n<p>In our experience at ZetarMold, the advantages break down like this:<\/p>\n<ul>\n<li><b>Lower per-part cost<\/b> \u2013 Machine hourly rate is divided across more parts. A 16-cavity mold can cut piece price by 60\u201380% versus a single-cavity tool.<\/li>\n<li><b>Reduced labor per part<\/b> \u2013 One operator runs one press regardless of cavity count.<\/li>\n<li><b>Faster time to volume<\/b> \u2013 High-volume launches meet demand sooner without needing multiple molds or presses.<\/li>\n<li><b>Consistent quality<\/b> \u2013 All parts come from the same process conditions in the same shot, reducing lot-to-lot variation.<\/li>\n<\/ul>\n<p>We&#8217;ve seen customers cut their total program cost by 40% simply by moving from a 4-cavity to a 16-cavity mold on a bottle cap project producing 50 million units per year.<\/p>\n<h2>What Are the Common Challenges and How Do You Solve Them?<\/h2>\n<p>The most common challenges are fill imbalance, uneven cooling, higher upfront tooling cost, and more complex maintenance. Each has proven solutions that experienced mold makers apply routinely.<\/p>\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"457\" class=\"wp-image-53105\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-plastic-resin-pellets.webp\" alt=\"Plastic resin pellets for injection molding\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-plastic-resin-pellets.webp 1200w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-plastic-resin-pellets-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-plastic-resin-pellets-1024x585.webp 1024w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-plastic-resin-pellets-768x438.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-plastic-resin-pellets-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-plastic-resin-pellets-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Plastic resin pellets used in injection molding<\/figcaption><\/figure>\n<p><b>Fill imbalance<\/b> is the number-one issue. Even in geometrically balanced runners, a phenomenon called <a href=\"https:\/\/zetarmold.com\/nl\/injection-molding-defects\/\">shear-induced imbalance<\/a><sup id=\"fnref1:3\"><a href=\"#fn:3\" class=\"footnote-ref\">3<\/a><\/sup> can cause inner and outer cavities to fill differently. We solve this with MeltFlipper\u00ae technology or artificially adjusted runner diameters validated through simulation and short-shot studies.<\/p>\n<p><b>Uneven cooling<\/b> happens when cavities in the center of the mold run hotter than those on the edges. We address this with <a href=\"https:\/\/zetarmold.com\/nl\/verkort-de-koeltijd\/\">conformal cooling<\/a> channels in critical zones and independent cooling circuits per cavity row, monitored by thermocouples during trial runs.<\/p>\n<p><b>Higher tooling cost<\/b> is real\u2014a 16-cavity mold might cost 3\u20135\u00d7 more than a single-cavity version. But when amortized over hundreds of thousands or millions of parts, the per-piece tooling amortization drops well below the single-cavity alternative. We help customers run ROI calculations before committing to a cavity count.<\/p>\n<p><b>Maintenance complexity<\/b> increases with cavity count. More cavities mean more core pins, more ejector pins, more cooling lines to inspect. At ZetarMold, we design modular cavity inserts so individual cavities can be pulled for repair without disassembling the entire mold.<\/p>\n<h2>Which Industries and Applications Use Multi-Cavity Molds?<\/h2>\n<p>Multi-cavity molds are used wherever high volumes of identical small-to-medium parts are needed\u2014packaging, medical devices, consumer electronics, automotive, and household goods are the top five sectors.<\/p>\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"457\" class=\"wp-image-53140\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-injection-molding-process-v2.webp\" alt=\"Injection molding production process\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-injection-molding-process-v2.webp 1200w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-injection-molding-process-v2-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-injection-molding-process-v2-1024x585.webp 1024w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-injection-molding-process-v2-768x438.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-injection-molding-process-v2-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/hdpe-injection-molding-process-v2-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Injection molding machine in production<\/figcaption><\/figure>\n<p>Here&#8217;s what we build most often at ZetarMold:<\/p>\n<ul>\n<li><b>Verpakking<\/b> \u2013 Bottle caps (32\u2013128 cavities), thin-wall containers, closures<\/li>\n<li><b>Medisch<\/b> \u2013 Syringe barrels, pipette tips, diagnostic cartridge housings (16\u201364 cavities, often in cleanroom-grade steel)<\/li>\n<li><b>Elektronica<\/b> \u2013 Connector housings, LED lens arrays, switch covers (8\u201332 cavities)<\/li>\n<li><b>Automotive<\/b> \u2013 Small clips, fasteners, sensor housings (4\u201316 cavities)<\/li>\n<li><b>Consumer goods<\/b> \u2013 Toothbrush heads, razor cartridge components, toy parts<\/li>\n<\/ul>\n<p>The common thread is annual volume. As a rule of thumb, if you&#8217;re producing fewer than 50,000 parts per year, a single or 2-cavity mold is usually sufficient. Above 500,000 parts per year, multi-cavity tooling almost always makes economic sense.<\/p>\n<div class=\"claim claim-false\" style=\"background-color: #f7efef; border-color: #f7efef; color: #db6f85;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><circle cx=\"12\" cy=\"12\" r=\"10\"\/><line x1=\"15\" y1=\"9\" x2=\"9\" y2=\"15\"\/><line x1=\"9\" y1=\"9\" x2=\"15\" y2=\"15\"\/><\/svg> <b>&#8220;Multi-cavity molds are only suitable for simple, flat parts.&#8221;<\/b><span class='claim-true-or-false'>Vals<\/span><\/p>\n<p class='claim-explanation'>Modern multi-cavity molds handle complex geometries including undercuts (via lifters and slides), textured surfaces, and tight tolerances. The key constraint is part size relative to available press platen area, not geometric complexity.<\/p>\n<\/div>\n<div class=\"claim claim-true\" style=\"background-color: #eff2ef; border-color: #eff2ef; color: #5b8c70;\">\n<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polyline points=\"20 6 9 17 4 12\"\/><\/svg> <b>&#8220;The primary factor determining optimal cavity count is annual production volume balanced against tooling investment.&#8221;<\/b><span class='claim-true-or-false'>Echt<\/span><\/p>\n<p class='claim-explanation'>Cavity count is an economic optimization: more cavities lower per-part cost but raise upfront tooling expense. The breakeven point depends on annual volume, part price target, and available press capacity.<\/p>\n<\/div>\n<h2>What Does the Design and Manufacturing Process Look Like?<\/h2>\n<p>The process follows a structured sequence: DFM review, cavity count optimization, mold flow simulation, detailed mold design, steel cutting, assembly, trial, and qualification. At ZetarMold, the entire cycle from design kick-off to T1 samples typically takes 4\u20138 weeks depending on complexity.<\/p>\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"457\" class=\"wp-image-53133\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/low-volume-mold-tooling-inspection-1.webp\" alt=\"Mold tooling inspection with depth gauge\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/low-volume-mold-tooling-inspection-1.webp 1200w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/low-volume-mold-tooling-inspection-1-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/low-volume-mold-tooling-inspection-1-1024x585.webp 1024w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/low-volume-mold-tooling-inspection-1-768x438.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/low-volume-mold-tooling-inspection-1-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/low-volume-mold-tooling-inspection-1-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Precision mold tooling inspection and measurement<\/figcaption><\/figure>\n<p>Here&#8217;s how we approach it:<\/p>\n<ol>\n<li><b>DFM review<\/b> \u2013 We analyze the part design for moldability, draft angles, wall thickness uniformity, and gate location options.<\/li>\n<li><b>Cavity count study<\/b> \u2013 Based on annual volume, target piece price, and available press sizes, we recommend an optimal cavity count with ROI projections.<\/li>\n<li><b>Simulatie van schimmelstromen<\/b> Krimp is de volumetrische samentrekking van een kunststof onderdeel wanneer het afkoelt en stolt in de mal, meestal vari\u00ebrend van 0,3% tot 3%, afhankelijk van het materiaaltype, de onderdeelgeometrie en de verwerkingsomstandigheden. <a href=\"https:\/\/zetarmold.com\/nl\/trekhoek-van-kunststof-spuitgieten\/\">krimp<\/a><sup id=\"fnref1:4\"><a href=\"#fn:4\" class=\"footnote-ref\">4<\/a><\/sup> behavior.<\/li>\n<li><b>Detailed design<\/b> \u2013 Full 3D mold design in NX\/UG or SOLIDWORKS, including runner system, cooling circuits, ejection layout, and mold base selection.<\/li>\n<li><b>Steel machining<\/b> \u2013 CNC milling, EDM, wire EDM, and grinding to tolerances of \u00b10.005 mm on critical cavity dimensions.<\/li>\n<li><b>Assembly and spotting<\/b> \u2013 All components are assembled, parting line fit is verified by blue-spotting, and cooling circuits are pressure-tested.<\/li>\n<li><b>Mold trial (T1)<\/b> \u2013 First shots are run, parts are measured against drawings, and process parameters are documented.<\/li>\n<li><b>Optimization (T2\/T3 if needed)<\/b> \u2013 Fine-tuning runner sizes, cooling times, or gate dimensions until all cavities meet spec.<\/li>\n<\/ol>\n<h2>How Does Cavity Count Affect Part Quality and Total Cost?<\/h2>\n<p>Cavity count affects quality through its influence on fill balance and cooling uniformity, and it affects total cost through the trade-off between higher tooling investment and lower per-part production cost. The sweet spot is the cavity count where total program cost (tooling + production) is minimized while maintaining required quality standards.<\/p>\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"457\" class=\"wp-image-53134\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/prototype-plastic-parts-batch-1.webp\" alt=\"Prototype plastic parts batch\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/prototype-plastic-parts-batch-1.webp 1200w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/prototype-plastic-parts-batch-1-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/prototype-plastic-parts-batch-1-1024x585.webp 1024w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/prototype-plastic-parts-batch-1-768x438.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/prototype-plastic-parts-batch-1-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/prototype-plastic-parts-batch-1-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Batch of injection molded plastic parts<\/figcaption><\/figure>\n<p>We&#8217;ve compiled data from recent ZetarMold projects to illustrate the economics:<\/p>\n<table>\n<thead>\n<tr>\n<th>Cavity Count<\/th>\n<th>Relative Mold Cost<\/th>\n<th>Cycle Time (sec)<\/th>\n<th>Parts\/Hour<\/th>\n<th>Per-Part Cost Index<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>1.0\u00d7<\/td>\n<td>18<\/td>\n<td>200<\/td>\n<td>1.00<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>2.2\u00d7<\/td>\n<td>20<\/td>\n<td>720<\/td>\n<td>0.38<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>3.0\u00d7<\/td>\n<td>22<\/td>\n<td>1,309<\/td>\n<td>0.22<\/td>\n<\/tr>\n<tr>\n<td>16<\/td>\n<td>4.5\u00d7<\/td>\n<td>24<\/td>\n<td>2,400<\/td>\n<td>0.15<\/td>\n<\/tr>\n<tr>\n<td>32<\/td>\n<td>7.0\u00d7<\/td>\n<td>26<\/td>\n<td>4,431<\/td>\n<td>0.11<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>As the table shows, doubling cavities does not double mold cost\u2014there are economies of scale in the mold base, <a href=\"https:\/\/zetarmold.com\/nl\/hotrunner-spuitgieten\/\">hot runner system<\/a><sup id=\"fnref1:5\"><a href=\"#fn:5\" class=\"footnote-ref\">5<\/a><\/sup>, and design work. Meanwhile, per-part cost drops steeply. For a program producing 2 million parts per year, the jump from 8 to 16 cavities typically pays back within 3\u20134 months of production.<\/p>\n<p>On the quality side, higher cavity counts demand tighter process control. We monitor cavity pressure with in-mold sensors and use statistical process control (SPC) to track cavity-to-cavity variation. Our target is always less than 1% weight variation across all cavities\u2014a benchmark we consistently achieve on production tools.<\/p>\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"457\" class=\"wp-image-53108\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-quality-testing.webp\" alt=\"Quality inspection of injection molded parts\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-quality-testing.webp 1200w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-quality-testing-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-quality-testing-1024x585.webp 1024w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-quality-testing-768x438.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-quality-testing-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-quality-testing-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Quality inspection of injection molded plastic parts<\/figcaption><\/figure>\n<h2>FAQ<\/h2>\n<h3>What is the difference between a multi-cavity mold and a family mold?<\/h3>\n<p>A multi-cavity mold produces multiple copies of the <em>same<\/em> part in each shot. A family mold produces <em>different<\/em> parts (e.g., a left and right housing) in the same mold. Family molds are harder to balance because different part geometries have different flow and cooling requirements.<\/p>\n<h3>How do I decide the right cavity count for my project?<\/h3>\n<p>Start with your annual volume and target piece price. We then factor in press availability, part size, required cycle time, and tooling budget. At ZetarMold, we provide a cavity count optimization report with ROI analysis as part of our standard quoting process.<\/p>\n<h3>Do multi-cavity molds require larger injection molding machines?<\/h3>\n<p>Yes. More cavities mean a larger total shot volume and a bigger projected area on the parting line, both of which require more clamp tonnage and shot capacity. A 16-cavity mold typically needs a press 3\u20134\u00d7 larger than a single-cavity version of the same part.<\/p>\n<h3>Can I start with fewer cavities and add more later?<\/h3>\n<p>It&#8217;s possible if the mold base is designed for expansion from the beginning\u2014this is called a &#8220;scalable&#8221; or &#8220;expandable&#8221; mold base. However, retrofitting cavities into a mold not designed for it is usually impractical. We recommend planning the final cavity count upfront, even if you phase the cavity inserts.<\/p>\n<h3>How long does a multi-cavity mold last?<\/h3>\n<p>Mold life depends on steel grade, part material, and maintenance. A well-built multi-cavity mold in hardened H13 or S136 steel typically lasts 500,000 to 2,000,000+ shots. At ZetarMold, we guarantee mold life based on the SPI mold class specified in the project scope.<\/p>\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"457\" class=\"wp-image-53145\" src=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-australia-plastic-parts-v2-1.webp\" alt=\"Injection molded plastic parts variety\" srcset=\"https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-australia-plastic-parts-v2-1.webp 1200w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-australia-plastic-parts-v2-1-300x171.webp 300w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-australia-plastic-parts-v2-1-1024x585.webp 1024w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-australia-plastic-parts-v2-1-768x438.webp 768w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-australia-plastic-parts-v2-1-18x10.webp 18w, https:\/\/zetarmold.com\/wp-content\/uploads\/2026\/03\/injection-molding-australia-plastic-parts-v2-1-600x343.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Various injection molded plastic parts<\/figcaption><\/figure>\n<h2>Samenvatting<\/h2>\n<p>A multiple cavity injection mold is the workhorse behind high-volume plastic part production. By producing multiple identical parts per cycle, it slashes per-unit cost, maximizes press utilization, and delivers consistent quality across every cavity. The trade-off is higher upfront tooling investment and greater engineering complexity\u2014but for programs above 100,000 parts per year, the economics almost always favor multi-cavity tooling.<\/p>\n<p>At ZetarMold, we&#8217;ve built hundreds of multi-cavity molds ranging from 2 to 128 cavities across packaging, medical, automotive, and consumer electronics applications. Our approach combines mold flow simulation, precision CNC machining to \u00b10.005 mm, and rigorous trial protocols to ensure every cavity performs identically. If you&#8217;re planning a high-volume program and want to explore multi-cavity tooling, <a href=\"https:\/\/zetarmold.com\/nl\/contact\/\">reach out to our engineering team<\/a> for a free DFM review and cavity count recommendation. See our <strong>Injection Molding Complete Guide<\/strong> for a comprehensive overview. See our <strong>Injection Molding Complete Guide<\/strong> for a comprehensive overview. See our <strong>Injection Molding Complete Guide<\/strong> for a comprehensive overview. See our <a href=\"https:\/\/zetarmold.com\/nl\/injection-molding-complete-guide\/\">Injection Molding Complete Guide<\/a> for a comprehensive overview.<\/p>\n<div class=\"footnotes\">\n<hr \/>\n<ol>\n<li id=\"fn:1\">\n<p>Part geometry refers to the three-dimensional shape, features, and dimensions of a molded component, including wall thickness, ribs, bosses, undercuts, and draft angles that collectively determine moldability and tooling complexity.&#160;<a href=\"#fnref1:1\" rev=\"footnote\" class=\"footnote-backref\">&#8617;<\/a><\/p>\n<\/li>\n<li id=\"fn:2\">\n<p>Mold flow analysis is a computer simulation technique that predicts how molten plastic fills a mold cavity, identifying potential issues like air traps, weld lines, and fill imbalance before the mold is manufactured.&#160;<a href=\"#fnref1:2\" rev=\"footnote\" class=\"footnote-backref\">&#8617;<\/a><\/p>\n<\/li>\n<li id=\"fn:3\">\n<p>Shear-induced imbalance is a flow phenomenon in multi-cavity runner systems where the shear-heated outer layer of the melt stream is unevenly distributed at runner branch points, causing some cavities to receive hotter (lower viscosity) material and fill faster than others.&#160;<a href=\"#fnref1:3\" rev=\"footnote\" class=\"footnote-backref\">&#8617;<\/a><\/p>\n<\/li>\n<li id=\"fn:4\">\n<p>Shrinkage is the volumetric contraction of a plastic part as it cools and solidifies in the mold, typically ranging from 0.3% to 3% depending on material type, part geometry, and processing conditions.&#160;<a href=\"#fnref1:4\" rev=\"footnote\" class=\"footnote-backref\">&#8617;<\/a><\/p>\n<\/li>\n<li id=\"fn:5\">\n<p>A hot runner system is a heated manifold and nozzle assembly inside the mold that keeps the plastic in the runner channels molten, eliminating runner waste and improving fill balance in multi-cavity applications.&#160;<a href=\"#fnref1:5\" rev=\"footnote\" class=\"footnote-backref\">&#8617;<\/a><\/p>\n<\/li>\n<\/ol>\n<\/div>\n<div style=\"background:#f0f4f8;padding:20px;border-radius:8px;margin-top:30px;\">\n<p style=\"margin:0 0 10px;font-size:18px;\"><strong>Need a Quote for Your Injection Molding Project?<\/strong><\/p>\n<p style=\"margin:0 0 10px;\">Get competitive pricing, DFM feedback, and production timeline from ZetarMold&#8217;s engineering team.<\/p>\n<p style=\"margin:0;\"><a href=\"https:\/\/zetarmold.com\/nl\/contact-met-ons-opnemen\/\" style=\"background:#2563eb;color:white;padding:12px 24px;border-radius:6px;text-decoration:none;font-weight:bold;\">Request a Free Quote \u2192<\/a><\/p>\n<\/div>\n<p><script type=\"application\/ld+json\">{\n    \"@context\": \"https:\\\/\\\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the difference between a multi-cavity mold and a family mold?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A multi-cavity mold produces multiple copies of the same part in each shot. A family mold produces different parts (e.g., a left and right housing) in the same mold. Family molds are harder to balance because different part geometries have different flow and cooling requirements.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I decide the right cavity count for my project?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Start with your annual volume and target piece price. We then factor in press availability, part size, required cycle time, and tooling budget. At ZetarMold, we provide a cavity count optimization report with ROI analysis as part of our standard quoting process.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do multi-cavity molds require larger injection molding machines?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. More cavities mean a larger total shot volume and a bigger projected area on the parting line, both of which require more clamp tonnage and shot capacity. A 16-cavity mold typically needs a press 3\\u20134\\u00d7 larger than a single-cavity version of the same part.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I start with fewer cavities and add more later?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It\\u2019s possible if the mold base is designed for expansion from the beginning\\u2014this is called a \\u201cscalable\\u201d or \\u201cexpandable\\u201d mold base. However, retrofitting cavities into a mold not designed for it is usually impractical. We recommend planning the final cavity count upfront, even if you phase the cavity inserts.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How long does a multi-cavity mold last?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Mold life depends on steel grade, part material, and maintenance. A well-built multi-cavity mold in hardened H13 or S136 steel typically lasts 500,000 to 2,000,000+ shots. At ZetarMold, we guarantee mold life based on the SPI mold class specified in the project scope. Various injection molded plastic parts\"\n            }\n        }\n    ]\n}<\/script><\/p>","protected":false},"excerpt":{"rendered":"<p>Key Takeaways \u2013 A multiple cavity injection mold produces several identical parts in a single shot, dramatically cutting per-unit cost and cycle time. \u2013 Cavity counts typically range from 2 to 128+, chosen based on annual volume, part size, and press tonnage. \u2013 Balanced runner design and uniform cooling are the two biggest factors in [&hellip;]<\/p>","protected":false},"author":1,"featured_media":38013,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"What Is a Multiple Cavity Injection Mold? | ZetarMold","_seopress_titles_desc":"Learn how multiple cavity injection molds boost production by 8-16x while cutting per-part costs up to 80%. Expert guide from ZetarMold with real factory data.","_seopress_robots_index":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[43],"tags":[182,164,125,89,189],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/posts\/38018"}],"collection":[{"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/comments?post=38018"}],"version-history":[{"count":0,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/posts\/38018\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/media\/38013"}],"wp:attachment":[{"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/media?parent=38018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/categories?post=38018"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zetarmold.com\/nl\/wp-json\/wp\/v2\/tags?post=38018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}