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Locating ring : A ring which serve to align the nozzle of an injection
cylinder with entrance of sprue bushing and mould to
the machine platen.
Mandrel : A metal bar used as a core around which fabrics are
wound. In plastic industry, it is used chiefly in making
laminated tubes. In extrusion, it is the center member
of tubing die.
Matte finish : A dull or non - reflective finish
Moulding pressure : The force necessary to cause the plastic material to
flow into a mould
Mould shrinkage : It refers not to the shrinkage of a mould but to the
immediate shrinkage of plastic part after it has been
removed from the mould. both mould and moulded
part are measured at room temperature.
Orientation : A process of stretching a heated plastic article to
realign its molecular configuration
Parting line : Marks on moulding or casting where halves of mould
meets in closing.
Pin ejection : Simplest to incorporate in a mould, ejector force is
applied by steel rods, called ejector pins.
Pinch off : A raised edge around the cavity in a mould, which
seals off the part and separate excess material as
mould closes around parsion in blow moulding
process.
Pin point gate : A restricted orifice of 0.03 inch or less in diameter
through which molten resin flow into a cavity.
Plunger : The part of transfer or injection press that apply
pressure on the un melted plastic to push into the
chamber.
Poisson ratio : The ratio of lateral steain to axial strain in an axial
loaded specimen
Prototype mould : A temporary or experimental mould made in order to
obtain information on part design, tool design and
market reactions.
Ribs : They increase rigidity and strength of a part without
increasing the part thickness.
Runner : In an in injection or transfer mould, the channel that
connect the sprue with gate to the cavity.
Shrinkage : The additional dimensions that must be added to a
mould to compensate for Shrinkage of a plastic

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