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BUILDING A PLASTIC INJECTION MOLD-part design
- Mar 08, 2018 -

BUILDING A PLASTIC INJECTION MOLD-Part design


Part Design

Plastics are essentially squeezed into a chamber with a machine that takes small pellets and melts them before it is pushed into the cavity. Cooling is routed thru the mold to make the process run super fast. If you find that you need lots of parts, you can add multiple cavities or a pattern of cavities. One can imaging when plastic molecules are cooling, then tend to shrink from a liquid state to a solid state. Molds must accommodate for these changes, so the cavities and cores are scaled up so the plastic will shrink back to size. We will refer to this subject as shrinkage.

These cavities and cores are mounted in a mold base where small pins are used to knock the plastic parts out of a cavity or core. The core is traditionally on the "B" side of the mold. This is also refereed to as the ejector side of the mold. The cavity is on the "A" side of the mold or the hot side. That is the fixed and stationary in the molding machine when it is bolted down. We traditionally inject the plastic into this "A" side of the mold.

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