{"id":6501,"date":"2026-09-19T11:18:24","date_gmt":"2026-09-19T11:18:24","guid":{"rendered":"https:\/\/mouldzone.com\/blog\/?p=6501"},"modified":"2026-09-19T11:18:24","modified_gmt":"2026-09-19T11:18:24","slug":"single-cavity-injection-moulds","status":"publish","type":"post","link":"https:\/\/mouldzone.com\/blog\/single-cavity-injection-moulds\/","title":{"rendered":"Single-Cavity Injection Moulds"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

A single-cavity injection mould<\/strong> is a mould designed to produce one plastic part in each injection cycle<\/strong>. It is one of the simplest injection mould configurations and is commonly used for prototypes, small production runs, large components, and products that require frequent design changes.<\/p>\n\n\n\n

How Does a Single-Cavity Injection Mould Work?<\/h3>\n\n\n\n

The basic injection moulding cycle includes:<\/p>\n\n\n\n

1. Mould Closing<\/strong>
The mould closes, bringing the core and cavity together to create the moulding space.<\/p>\n\n\n\n

2. Plastic Injection<\/strong>
Molten plastic is injected through the sprue, runner, and gate into the single cavity.<\/p>\n\n\n\n

3. Filling and Packing<\/strong>
The cavity is filled with molten plastic, followed by holding or packing pressure to help compensate for material shrinkage.<\/p>\n\n\n\n

4. Cooling<\/strong>
Cooling channels remove heat from the mould while the plastic solidifies.<\/p>\n\n\n\n

5. Mould Opening<\/strong>
After sufficient cooling, the mould opens.<\/p>\n\n\n\n

6. Ejection<\/strong>
Ejector pins or another ejection mechanism remove the finished component.<\/p>\n\n\n\n

The mould then closes again for the next cycle.<\/p>\n\n\n\n

Main Components<\/h3>\n\n\n\n

A single-cavity injection mould typically includes:<\/p>\n\n\n\n

    \n
  • Core<\/strong> \u2013 Forms the internal features of the part.<\/li>\n\n\n\n
  • Cavity<\/strong> \u2013 Forms the external shape.<\/li>\n\n\n\n
  • Sprue<\/strong> \u2013 Main channel carrying molten plastic from the machine nozzle.<\/li>\n\n\n\n
  • Runner<\/strong> \u2013 Carries material from the sprue toward the gate.<\/li>\n\n\n\n
  • Gate<\/strong> \u2013 Entry point through which plastic enters the cavity.<\/li>\n\n\n\n
  • Cooling Channels<\/strong> \u2013 Control mould temperature and help solidify the part.<\/li>\n\n\n\n
  • Ejector Pins<\/strong> \u2013 Push the finished part out of the mould.<\/li>\n\n\n\n
  • Guide Pins and Bushes<\/strong> \u2013 Maintain alignment between mould halves.<\/li>\n\n\n\n
  • Vents<\/strong> \u2013 Allow trapped air and gases to escape.<\/li>\n<\/ul>\n\n\n\n

    Advantages<\/h3>\n\n\n\n

    Simple Construction<\/strong>
    A single cavity generally makes the mould easier to design, manufacture, and maintain.<\/p>\n\n\n\n

    Lower Tooling Investment<\/strong>
    For suitable applications, a single-cavity mould can require less initial tooling investment than a comparable multi-cavity mould.<\/p>\n\n\n\n

    Easy Process Setup<\/strong>
    Only one cavity needs to be filled, so there is no need to balance flow between multiple cavities.<\/p>\n\n\n\n

    Useful for Prototypes<\/strong>
    It is practical for testing new product designs before investing in higher-output tooling.<\/p>\n\n\n\n

    Suitable for Large Components<\/strong>
    Large products may be better suited to a single-cavity arrangement because of mould size and machine capacity.<\/p>\n\n\n\n

    Easy Design Modification<\/strong>
    Design changes can be relatively straightforward during product development, depending on the mould construction.<\/p>\n\n\n\n

    Limitations<\/h3>\n\n\n\n
      \n
    • Only one part is produced per cycle<\/strong>.<\/li>\n\n\n\n
    • Production output is lower than with multi-cavity moulds.<\/li>\n\n\n\n
    • It may be less economical for very high-volume production.<\/li>\n\n\n\n
    • Machine time per finished part can be higher when compared with a suitable multi-cavity mould.<\/li>\n<\/ul>\n\n\n\n

      Single-Cavity vs. Multi-Cavity<\/h3>\n\n\n\n
      Feature<\/th>Single-Cavity Mould<\/th>Multi-Cavity Mould<\/th><\/tr><\/thead>
      Parts per cycle<\/td>1<\/td>2 or more<\/td><\/tr>
      Production output<\/td>Lower<\/td>Higher<\/td><\/tr>
      Mould design<\/td>Generally simpler<\/td>Generally more complex<\/td><\/tr>
      Flow balancing<\/td>Not required between multiple cavities<\/td>Important<\/td><\/tr>
      Initial tooling cost<\/td>Generally lower<\/td>Generally higher<\/td><\/tr>
      Maintenance<\/td>Generally simpler<\/td>More involved<\/td><\/tr>
      Typical use<\/td>Prototypes, low-volume and large parts<\/td>Medium- to high-volume production<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

      When Is a Single-Cavity Mould Suitable?<\/h3>\n\n\n\n

      A single-cavity mould may be appropriate when:<\/p>\n\n\n\n

        \n
      • Production quantities are relatively low<\/li>\n\n\n\n
      • A product is still being developed<\/li>\n\n\n\n
      • The component is large<\/li>\n\n\n\n
      • Frequent design changes are expected<\/li>\n\n\n\n
      • Simple process control is desired<\/li>\n\n\n\n
      • Initial tooling cost needs to be controlled<\/li>\n<\/ul>\n\n\n\n

        In Short<\/h3>\n\n\n\n

        A single-cavity injection mould produces one plastic component per injection cycle.<\/strong> Its relatively simple construction and straightforward process control make it useful for prototyping, low-volume production, large components, and product development<\/strong>.<\/p>\n\n\n\n

        <\/p>\n","protected":false},"excerpt":{"rendered":"

        A single-cavity injection mould is a mould designed to produce one plastic part in each injection cycle. It is one of the simplest injection mould configurations and is commonly used for prototypes, small production runs, large components, and products that require frequent design changes. How Does a Single-Cavity Injection Mould Work? The basic injection moulding […]<\/p>\n","protected":false},"author":1,"featured_media":6502,"comment_status":"open","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":"set","ast-page-background-enabled":"default","ast-page-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":"","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-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":"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":""},"mobile":{"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":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-6501","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-other"],"_links":{"self":[{"href":"https:\/\/mouldzone.com\/blog\/wp-json\/wp\/v2\/posts\/6501","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mouldzone.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mouldzone.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mouldzone.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mouldzone.com\/blog\/wp-json\/wp\/v2\/comments?post=6501"}],"version-history":[{"count":1,"href":"https:\/\/mouldzone.com\/blog\/wp-json\/wp\/v2\/posts\/6501\/revisions"}],"predecessor-version":[{"id":6503,"href":"https:\/\/mouldzone.com\/blog\/wp-json\/wp\/v2\/posts\/6501\/revisions\/6503"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mouldzone.com\/blog\/wp-json\/wp\/v2\/media\/6502"}],"wp:attachment":[{"href":"https:\/\/mouldzone.com\/blog\/wp-json\/wp\/v2\/media?parent=6501"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mouldzone.com\/blog\/wp-json\/wp\/v2\/categories?post=6501"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mouldzone.com\/blog\/wp-json\/wp\/v2\/tags?post=6501"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}