Specac Atlas GS15800, Руководство пользователя, Страница: 35 / 48

Atlas™ High Temperature Film Maker Accessory
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Cooling the Sample
After a sufficient time has elapsed for pressing at the actual melting
temperature, reduce the set temperature on the 4000 Series
temperature controller back to a room temperature value (e.g. 20ºC) to
stop power being applied to the heated pressing surface assemblies
(
4 ) and ( 5 ).
When power is cut to the High Temperature Film Maker Accessory to
reduce the
actual temperature, maintain the pressing load on the
Accessory. The temperature level will reduce at a rate determined by
the immediate surroundings and local conditions prevailing at that time.
The rate of temperature change in time to reduce from an
actual melt
temperature at say 300°C to a reduced set temperature of 200°C will
be faster than a similar temperature step drop from actual of 200°C to
set at 100°C.
You may observe a decrease in the load on the load gauge of the
Press, which is normal when a compressed material “relaxes” on
cooling. Simply re-apply the pressing load via the piston if this effect is
seen and you wish to maintain the tonnage load that had been applied.
Note: For more efficient cooling the top ( 4 ) and lower ( 5 ) heated
pressing surface assemblies should be kept together and
therefore the pressure (from an applied tonnage load) should not
be allowed to drop to zero. Maintaining the load while cooling is
particularly recommended for samples that relax during cooling.
Any effect of a tonnage load application during the cooling stage
may be considered as part of a
particular procedure that is
required for the production of consistent and reproducible thin
films for the sample material type.
Accessing the Film Sample
Caution! Be sure to wear safety gloves and spectacles
when gaining access to a thin film sample from the High
Temperature Film Maker Accessory after a heating and
pressing procedure. Certain components may still be too
hot to touch with bare hands and so these precautions
minimize the risk of accidental burns.