Shenzhen Alu Rapid Prototype Precision Co., Ltd.

In injection molding, the cavity refers to the concave, hollow space within the mold that directly shapes the exterior surface of the final plastic part. It is typically the "A-side" or upper half of the two-part mold assembly (the other half being the core, which forms the interior or hidden features of the part). When the mold is closed, the cavity and core come together to create the precise shape into which molten thermoplastic material is injected under high pressure. Once the material cools and solidifies, the part is ejected, and the cavity's surface often becomes the visible or "show" side of the finished product.

Key Aspects of the Cavity:

Function: It defines the outer contours, texture, and details of the molded part, ensuring dimensional accuracy and surface quality.

Design Considerations: Cavities are machined to be highly precise (often with tolerances in the micrometer range) and may include features like draft angles for easy ejection or venting channels to allow trapped air to escape.

Single vs. Multi-Cavity Molds: A single-cavity mold produces one part per cycle, while a multi-cavity mold has multiple identical cavities to produce several parts simultaneously, improving efficiency for high-volume production.

This core-and-cavity system is fundamental to injection molding's ability to create complex, repeatable parts at scale. If you're designing a mold or troubleshooting a specific issue, factors like material flow into the cavity can significantly impact results.