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The drawback with this method is that not much else can be accomplished while the cycle is being completed—for example, no additional inserts can be loaded in the mold. To solve this problem, multiple mold bottoms are often used so operators can continue to work during the molding cycle, reducing overall cycle times and improving output.

Whichever process is used, the inserts loaded in the bottom mold half must be held securely in place so that, when the top closes, neither the mold nor the often-expensive insert is damaged. Damage to the mold can be substantial, especially when the two halves close under high tonnage around steel or other rigid materials, so it is important to locate and secure components in place carefully during molding. Still, factors such as operator misplacement or shuttle/rotary table vibration can mean damage to the mold or the inserts.

These molds are often made from a prehard stainless steel, with a high grade tool steel hinge for wear and support. Like conventional molds, book molds may have taper locks to maintain alignment between both halves and avoid shifting. A tapered sprue bushing is located on the top of the mold so that, when the mold is opened, the sprue and runner will remain in the bottom half. Ejectors are installed in the bottom half to lift out finished parts along with the sprue and runner, so multiple cavities are often well suited for book molds. A handle is often mounted on the top half for easy opening, which can be done either manually by the press operator, or with a stationary ramp.

Another advantage is that, so long as they use a common molding resin, different book molds can be run together on a rotary table at one time, which means complete assemblies or family parts can be manufactured together. In this way, when the rotary table makes a complete turn, it yields a finished assembly containing multiple molded parts. More information on the Mold design Illinois and Plastic injection moldings in our offer you can find here.

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