Dec 7, 2024 · You can easily distinguish the core and cavity sections of an injection mold; they form the two halves that create a complete mold, where molten plastic is injected during the process. The core portion is responsible for providing the internal surface, whereas the cavity forms the exterior surface.

Two ways to mold the same geometry. Left: Deep rib molding uses milling to form part walls on the mold's B-side. Right: In core/cavity molding, the B-side's protruding core forms the interior of the part walls and the A-side forms the exterior walls.

Aug 4, 2023 · As briefly covered in the intro, the core of a mold is the inside part that you can’t see, and the cavity is the exterior surface that will be visible and treated or polished as necessary. When they are put together in injection molding, melted plastic will fill the thin space between them and harden into the final part.

Oct 25, 2024 · Proper design of both the core AND cavity are critical to produce accurate, high-quality parts via injection molding. However, they play slightly different roles: The core ensures the molded part will meet functional requirements and specifications.

Nov 19, 2024 · Discover the role, design considerations, and differences between core and cavity in injection molding to achieve high-quality molded parts. Injection molding is one of the most widely used manufacturing processes for creating plastic parts, and at the heart of this process lie the core and cavity.

Mar 14, 2025 · Injection molding relies on the core and cavity parts to form the basic mold structure that produces plastic shapes. The mold’s outside shape comes from the cavity, and its inside details result from the core. The cavity and core elements determine how the molded part will look and measure in size.

In the world of injection molding, the terms core and cavity refer to the two essential components of a mold that define the shape and structure of the final part. Together, these elements work in tandem to create the exterior and interior features of molded components.

To ensure that the part stays in the mold half with the ejector system, we would design the mold so that the outside of the glass is formed in the cavity of the mold (A-side) and the inside would be formed by the core of the mold (B-Side).

Core: The core is the protruding (male) part of the mold, responsible for forming the internal features or hollow spaces of a plastic part. Cavity: The cavity is the concave (female) part of the mold that shapes the external surface of the part.

Jun 26, 2023 · What Is Core and Cavity in Injection Molding? In injection molding, the core and cavity are used to create the desired shape of the molded part. When the mold closes, the core and cavity come together to create the mold cavity, which is then filled with molten plastic to form the final part shape.