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Raw material :
Tested
raw materials such as clay, quartz and feldspar are ground in ball mill
to a wet slurry form.
Filter
pressing :
Hydraulic
high pressure filter presses are used to de-water the slurry in the
form of cakes.
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Pugging
:
Vacuum
extrusion of filter cakes in de-airing pug mill is performed to achieve
homogeneous, air free and compact blanks.
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Copying
and Shaping :
The extruded pugs are copied in different shapes
as per design template after calculating shrinkage values.
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Drying
:
The shaped wares are dried in natural atmosphere
and hot rooms to remove moisture.
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Glazing
and Finishing :
A glaze of various chemicals is applied on the dried ware before
firing to give it shine,
electrical and mechanical properties.
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Firing
:
Firing
is done in high temperature tunnel and shuttle kilns to vitrify the dried ware.
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Assembly
:
Assembly is done with cement on metal
parts/thimbles as per technical specifications
of the porcelain insulator.
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Packing
and Despatch :
The tested insulators are sorted, counted and
packed into wooden crates/boxes for ready despatch. |
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