Here's how the injection molding process works:
The polymer pellets are first dried and placed in a hopper where they are mixed with coloring pigments or other reinforcing additives.
Pellets are fed into the barrel where they are heated, mixed, and moved toward the die by variable-pitch screws. The screw and barrel geometry is optimized to help build pressure to the correct level and melt the material.
Then, the punch moves forward, and the molten plastic is injected into the mold through the runner system, filling the entire cavity. As the material cools, it resolidifies and takes the shape of the mold.
Finally, the mold is opened and the now solid part is pushed out by the ejector pin. The mold is then closed and the process is repeated.
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