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scattered from within the specimen or from its
surfaces
Dowel : A pin used to maintain the alignment between two or
more parts of a mould.
Ejector : The provision in a clamping unit, which actuate a
mechanism within a mould to eject plastic
components from the mould. An ejector force may be
applied hydraulically or pneumatically by cylinder
attached to moving platen or mechanically by opening
stroke of moving platen.
Feed plate : The frist plate in under feed mould design. In majority
of such designs, the plate contains a sprue and runner
system.
Feed system : An internal passageway in a mould, which provide
flow part for plastic material from the nozzle to the
impression. The feed system normally comprises
sprue, runner and gate.
Force plates : The plate that carries the plunger of a mould, guide
pins or bushing
Flow lines : Lines that are visible on the surface of a plasticpiece
made by the meeting of two flow fronts during
moulding Also called weld lines.
Gusset : An annular piece of material used to support or
strengthen two adjoining walls.
Hand mould : Moulds that are removed from the press by an
operator, who opens the mould and remove parts by
hand
Hot heated : It is the portion of thermoplastic injection in mould
which contain the runner system, has its own heating
manifold mould
elements which keep the moulded material in a plastic
state ready for injection into cavities, from which the
manifold is insulated.
Hot runner mould : A thermoplastic injection mould in which the runner
are insulated from chilled cavities and remain hot so
that the center of runner never cools in normal
operation. Runners are not usually ejected with
moulded pieces.
Jetting : Polymer expand after passing through a small gate,
cools rapidly and leave a relatively cold material in the
cavity, causing reduction in strength.
Kirksite : An alloy of aluminum and zinc used for construction of
blow moulds, it imparts high degree of heat
conductivity to the mould.

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