A molding process uses pressure and heat to fill the cavity of a mold, a rigid frame also known as a matrix. The raw material, typically a pliable one like plastic, glass, or ceramic, is kept under pressure until it solidifies or vulcanizes (i.e., begins to harden).
The first step of injection molding is the process of clamping. The clamping unit is what pieces together the mold before the injection takes place. The two sides of the mold are placed into the unit and then the machine pushes the two halves together to prepare for the next step: injection.
Once the clamping phase is complete and the two halves are put together, the injection of the plastic begins. The plastic, usually in the form of pellets, are then pumped into a container in which they are melted down to a complete liquid. This liquid is then injected into the mold, maintaining temperature throughout the process.
Next comes the dwelling phase, in which the plastic is filled to the entirety of the mold. This is done through pressure. Pressure is applied to the mold so that way the plastic covers all of the mold cavities to ensure the product will come out correct.
The fourth step is the cooling stage and is the most straightforward. The mold is left alone so the plastic inside can cool and start to form as a solid inside of the mold.
Next step is the mold opening.
This is followed by the final step of ejection, which reveals the final plastic product from the mold.