Injection molding is where the mold is clamped to the vertical press-platen. The material (usually BMC) is fed into a barrel. Then, it is injected into a hot mold thanks to the injection plunger (or screw but mostly for thermoplastics). The compound flows easily into the cavity. When the mold opens, the part is released with the help of the ejectors. The cycle time of injection is very short due to the automation and this process allows for the use of multiple shot cavities. It's especially used for small and complex parts.
- Better for small to medium part sizes (0.1 lbs to 6 lbs) in high volume.
- Tight tolerances can be achieved with these low-shrink materials. Post curing is not needed.
- Consistent material delivery into the mold cavities.
- Good strength for small parts, especially when molded with Thick Molding Compound (TMC).