Mold Building Basics

The foundation of the injection molding process is the mold itself. The most common style is the straight-pull mold. This mold has two halves, a core, and a cavity. The halves of the mold, usually made from steel or aluminum, are held together in the molding press by mechanical clamps or hydraulic pressure. Molten plastic then fills the cavity to create the desired part. After the plastic cools, the halves of the mold are pulled apart.