Injection molding is a versatile
process for forming thermoplastic and thermoset
materials into molded products of intricate
shapes, at high production rates and with
good dimensional accuracy. The process involves
the injection, under high pressure, of a
metered quantity of heated and plasticized
material into a relatively cool mold--in
which the plastic material solidifies. Resin
pellets are fed through a heated screw and
barrel under high pressure. The liquefied
material moves through a runner system and
into the mold. The cavity of the mold determines
the external shape of the product while
the core shapes the interior. When the material
enters the chilled cavities, it starts to
re-plasticize and return to a solid state
and the configuration of the finished part.
The machine then ejects the finished parts
or products.
