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The Molders

Doug, Carlos, Adrian, Al & Ariel

Injection process
Heated plastic is forced under pressure into a mould cavity; it is then clamped together and solidifies into the shape of the mould creating the part.
Resin pellets are poured into the Feed hopper, a large open bottomed container, which feeds the granules down to the screw. The screw is turned by hydraulic or electric motor that turns the screw feeding the pellets up the screw's grooves. The depths of the screw flights decreases towards the end of the screw nearest the mold. As the screw rotates, the pellets are moved forward in the screw and they undergo extreme pressure and friction which generates most of the heat needed to melt the pellets. Heaters on either side of the screw assist in the heating and temperature control around the pellets during the melting process. The screw travel limit switches set the distance the screw moves.
The hydraulic system pumps oil from the oil tank to firmly close the male and female mold parts, that run along the tie bar; the liquid resin is then injected into the mould. Since the molds are clamped shut by the hydraulics, the heated plastic is forced under the pressure of the injection screw to take the shape of the mold. Some machines are run by electric motors instead of hydraulics or a combination of both. The water-cooling channels then assist in cooling the mould and the heated plastic solidifies into the part. The cycle is completed when the mold opens and the part is ejected (with the assistance of ejector pins within the mold).