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TERMS USED IN PRACTICAL WORKING

Air ring : A circular manifold used to distribute even flow of
cooling medium onto a hottow tubular form passing
through the center of the ring. in blow tubing, air cool
the tubing evenly to provide uniform wall thickness.
Antechamber : Shape to accommadate extended nozzle which permit
nozzle be positioned relatively close to gate entry.
Blind hole : A hole that is not drilled or moulded entirely through.
Bolster : A steel plate or block, machined to accommodate inserts.
Cavity : Depression in the mould, which usually forms on the
outer durface of the moulded part, Depending on the
number of impression, the mould is designated as a
singal or multi cavity
Cavity retainer plate : Plates in a mould, which hold the cavities and forces.
These plates are at the mould parting lines and
usually contain guide pins and bushings
Clamping force : In injection or compression moulding, it is the
pressure applied to a mould to keep it closed in
opposition to the fluid pressure of material within the
mould cavity and runner system. In blow moulding, it
is the pressure exerted on the two mould halves to
keep the mould closed during formation of a
container. Normally, this is expressed in tons.
Cold slug : The first material to enter in an injection mould, so
called because in passing through sprue orifice it is
cooled below the effective moulding temperature.
Compression ratio : In an extrusion screw, ratio of volume available in a
first flight (hopper) to the last flight at end of the screw.
Creep : The dimensional change with time of a material under
constant load, following an initial instantaneous
elastic deformation. The creep at room temperature
is called cold flow.
Day light : The space between the mould plates when the mould
is open
Debossed : An in dented or depressed design or lettering that is
moulded into an article so as to be below the main
outside surface of the articla.
Delamination : It’s the splitting of a plastic mterial along the planes of
its layers.
Haze : The cloudy and turbid aspect of appearance of an
otherwise transparent specimen caused by light

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