{"id":2487,"date":"2026-06-22T12:20:53","date_gmt":"2026-06-22T12:20:53","guid":{"rendered":"https:\/\/sivite-machinery.com\/?p=2487"},"modified":"2026-07-20T02:47:28","modified_gmt":"2026-07-20T02:47:28","slug":"diseno-de-moldes-para-maquinas-de-termoformado-de-plastico","status":"publish","type":"post","link":"https:\/\/sivite-machinery.com\/es\/mold-layout-for-plastic-thermoforming-machines\/","title":{"rendered":"C\u00f3mo colocar los moldes en las m\u00e1quinas de termoformado de pl\u00e1stico para reducir al m\u00ednimo los desechos"},"content":{"rendered":"\t\t
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In large-scale plastic packaging production, raw material costs account for 60% to 70% of total production expenditure. When operating industrial-grade plastic thermoforming machines, every millimeter of plastic sheet left on the scrap skeleton after cutting represents profit draining directly from the production floor.
While recycling systems allow scrap skeletons to be reground and re-extruded into pellets, this process consumes significant energy, degrades material properties, and increases labor costs. The most effective way to protect profit margins is to eliminate waste at the source: through mold arrangement optimization (layout optimization).
This technical guide provides an in-depth analysis of the mathematical principles behind mold layouts, advanced nesting strategies tailored to various product geometries, and how equipment configurations\u2014ranging from single-station machines to multi-station pressure forming systems\u2014dictate mold design solutions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The importance of mold layout far exceeds your imagination.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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During the thermoforming process, excess material (scrap) is trimmed away after the plastic sheet has been heated and formed; this scrap is typically discarded or ground up for recycling. Improper mold spacing increases the surface area of \u200b\u200bthe connecting webs between cavities\u2014material that ultimately becomes waste. Poor layout optimization can increase the scrap rate by 8\u201312% compared to a well-designed layout.
The core principle is simple: arrange as many cavities as possible within the available forming area without compromising product quality.
However, there are trade-offs involved. Arranging cavities too closely can lead to web formation (unwanted thin plastic connections between products) or uneven wall thickness, while excessive spacing wastes material. Finding the optimal balance requires an understanding of both the product geometry and the machine’s performance limits.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Mold layout principles applicable to various models<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Principle 1: Understand the geometric characteristics of male and female molds.<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The type of mold cavity used\u2014male (plug) or female (cavity)\u2014affects wall thickness distribution and the tightness of cavity spacing.
Female molds (where the sheet is drawn into a concave mold) typically produce the thinnest walls at the bottom and thicker walls at the edges. Within the limits of mechanical constraints, female mold cavities can usually be arranged very closely together.
Male mold cavities (where the sheet is draped over a raised mold) produce the thickest walls at the top, with thickness gradually decreasing along the sidewalls. Precise center-to-center spacing is required for this type of cavity to prevent “webbing” (where the sheet folds and sticks to itself) and excessive sidewall thinning.
The formula for calculating the minimum center-to-center spacing for male mold cavities is: > D = A + [L – 2(F \u00d7 tan E)]<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Rule 2: Use a straight-line layout to improve trimming efficiency.<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Although staggering triangular parts can improve material utilization, for most polygonal or circular cavities, a **linear arrangement** is more advantageous for simplifying the trimming process. While this approach may entail some sacrifice in material utilization, it significantly reduces labor costs and simplifies the trimming operation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Rule 3: Consider the chain guide effect.<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The edges of the forming area\u2014particularly near the chain guides used to transport the sheet\u2014exhibit different heating characteristics due to heat loss to the metal chains. If the mold cavity is positioned too close to the edge, incomplete forming may result. It is essential to allow for extra edge clearance, typically ranging from 50 to 100 mm (depending on the specific equipment).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Mold Layout for Multi-Station Positive\/Negative Pressure Thermoforming Machines<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Multi-station positive and negative pressure thermoforming machines represent the state of the art in this market. These machines combine positive pressure (applied from above) and vacuum suction (applied from below) to form products with uniform wall thickness and complex geometries.
Key layout advantages: The dual-pressure system allows for tighter cavity spacing, as plug-assist and pressure forming can drive material into narrower corners and deeper cavities without creating excessive connecting webs. Compared to standard vacuum forming, positive and negative pressure forming can reduce material thinning by up to 20%.
Layout considerations for this type of equipment:
T-style mold platform: Many modern multi-station machines feature a T-style platform design that supports rapid mold changes. This flexibility allows for switching between different cavity configurations without significant downtime.
Maximum speed and cavity count: 4-station positive and negative pressure thermoformers can operate at speeds of 40\u201350 cycles per minute. At these speeds, the material savings gained by adding a single cavity per row accumulate significantly. For thin-walled containers, one must weigh whether shortening cycle times (by increasing cavity count) or reducing scrap (by tightening spacing) yields a better return on investment (ROI).
Real-world example: When producing 200mm-diameter round containers on a SIVITE MACHINERY 3-station thermoformer, optimizing the cavity layout\u2014switching from a staggered to a linear arrangement and optimizing center-to-center spacing\u2014reduced the scrap rate from 22% to 14%, resulting in material savings of approximately 85kg per shift.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step-by-Step Process for Optimizing Mold Layout<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Here’s a practical workflow for any plastic thermoforming machine operator:
Step 1: Measure Your Forming Area
Get the exact dimensions of your forming station (the “mold table”). Account for clearances at the edges (chain rail, guides, etc.).
Step 2: Calculate Part Footprint
Determine the maximum dimensions of each cavity, including draft angles. Remember that the part footprint at the base differs from the top.
Step 3: Try Multiple Layout Configurations
Use CAD or even graph paper. Test:
Straight rows (best for trimming)
Staggered rows (may improve surface utilization)
Nested patterns (for triangular or irregular shapes)
Step 4: Calculate Scrap Percentage
For each layout:
Scrap % = (Sheet Area – (Cavity Area \u00d7 Number of Cavities)) \/ Sheet Area
Step 5: Run a Trial
Run a small batch, measure wall thickness, check for webs or tearing, and adjust spacing accordingly.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Recommendations<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Optimizing mold layout for plastic thermoforming machines is one of the most cost-effective ways to reduce material waste. While the underlying principles\u2014tight cavity packing, consideration of male and female mold geometries, and attention to the chain-track effect\u2014are universal, each machine type has its own specific limitations and advantages.
Single-station machines offer excellent process control, though material utilization can be somewhat compromised due to clamping requirements.
Multi-station vacuum forming machines strike a balance between speed and flexibility, adhering to more conservative spacing guidelines.
Multi-station pressure\/vacuum forming machines represent the gold standard for balancing speed and material utilization, enabling the tightest possible cavity packing.
Start by designing a layout that allows for adjustments, then conduct trials, measure results, and iterate continuously. With the right approach, you can reduce scrap rates by 8\u201315%\u2014savings that translate into significant benefits.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

In large-scale plastic packaging production, raw material costs account for 60% to 70% of total production expenditure. When operating industrial-grade […]<\/p>\n","protected":false},"author":5,"featured_media":2494,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[37],"tags":[],"class_list":["post-2487","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge"],"yoast_head":"\nHow to Arrange Molds on Plastic Thermoforming Machines to Minimize Scrap<\/title>\n<meta name=\"description\" content=\"Optimize mold layout on your plastic thermoforming machine. Discover spacing rules, cavity arrangement strategies, and machine-specific tips to cut material waste and boost ROI.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sivite-machinery.com\/es\/diseno-de-moldes-para-maquinas-de-termoformado-de-plastico\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Arrange Molds on Plastic Thermoforming Machines to Minimize Scrap\" \/>\n<meta property=\"og:description\" content=\"Optimize mold layout on your plastic thermoforming machine. Discover spacing rules, cavity arrangement strategies, and machine-specific tips to cut material waste and boost ROI.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sivite-machinery.com\/es\/diseno-de-moldes-para-maquinas-de-termoformado-de-plastico\/\" \/>\n<meta property=\"og:site_name\" content=\"Sivite Machinery\" \/>\n<meta property=\"article:published_time\" content=\"2026-06-22T12:20:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-20T02:47:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sivite-machinery.com\/wp-content\/uploads\/2026\/06\/Mold-Layout-Diagram-for-Plastic-Thermoforming-Machine.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"TAN, mingli\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"TAN, mingli\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/sivite-machinery.com\\\/mold-layout-for-plastic-thermoforming-machines\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/sivite-machinery.com\\\/mold-layout-for-plastic-thermoforming-machines\\\/\"},\"author\":{\"name\":\"TAN, mingli\",\"@id\":\"https:\\\/\\\/sivite-machinery.com\\\/#\\\/schema\\\/person\\\/4866346b02efea9e0ffe5b3c0799de7f\"},\"headline\":\"How to Arrange Molds on Plastic Thermoforming Machines to Minimize Scrap\",\"datePublished\":\"2026-06-22T12:20:53+00:00\",\"dateModified\":\"2026-07-20T02:47:28+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/sivite-machinery.com\\\/mold-layout-for-plastic-thermoforming-machines\\\/\"},\"wordCount\":1055,\"publisher\":{\"@id\":\"https:\\\/\\\/sivite-machinery.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/sivite-machinery.com\\\/mold-layout-for-plastic-thermoforming-machines\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/sivite-machinery.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Mold-Layout-Diagram-for-Plastic-Thermoforming-Machine.jpg\",\"articleSection\":[\"Knowledge\"],\"inLanguage\":\"es\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/sivite-machinery.com\\\/mold-layout-for-plastic-thermoforming-machines\\\/\",\"url\":\"https:\\\/\\\/sivite-machinery.com\\\/mold-layout-for-plastic-thermoforming-machines\\\/\",\"name\":\"How to Arrange Molds on Plastic Thermoforming Machines to Minimize Scrap\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/sivite-machinery.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/sivite-machinery.com\\\/mold-layout-for-plastic-thermoforming-machines\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/sivite-machinery.com\\\/mold-layout-for-plastic-thermoforming-machines\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/sivite-machinery.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Mold-Layout-Diagram-for-Plastic-Thermoforming-Machine.jpg\",\"datePublished\":\"2026-06-22T12:20:53+00:00\",\"dateModified\":\"2026-07-20T02:47:28+00:00\",\"description\":\"Optimize mold layout on your plastic thermoforming machine. 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