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Injection moulding
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Injection moulding (sometimes also referred to as injection die casting or feeder casting) is a master-pattern process and is mainly used in plastics processing.
The injection moulding die (die casting mould) is a tool made
of a number of sub-assemblies and different parts mostly made of steel;
it serves the production
of large numbers of plastic parts.
Die casting moulds may have one or two parting lines and several cavities with mould cores for each parting line, i.e. several
plastic parts at a time
can be produced in one mould. Tools with two parting lines often have
two-sided threads with a steep lead angle, which allows quick and
simultaneous opening and closing of both mould planes.
A distinction is made between cold-runner and hot-runner tools. In cold-runner systems the plastic hardens in the gate and is separated after
the cast has
been ejected. Hot-runner systems have a so-called needle
shut-off system in which the injection nozzle is shut off directly after application of the post
injection pressure by a shut-off.
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Glossary