Atlas™ Series Heated Platens
25
plastic sample to flow freely at elevated temperatures under
compression for reforming.
It is important to ensure that the plastic sample has reached the
temperature of the heated surfaces (
20
) and (
21
) before applying any
pressure (a tonnage load) to the sample. Ideally the heated platens
set
temperature value on the temperature controller should be such that
any plastic samples being pressed will be in a soft, malleable state
when the
actual
temperature indicated is the same as the
set
value.
Therefore, it is always useful to know, if possible, the melting point of
the plastic sample to apply an appropriate
set
temperature to reach for
the
actual
temperature for the most favourable pressing condition.
Do
not
press small, hard pellet samples before they have reached a
suitable plastic state, as there is a very real risk of localized “point
loading” that will cause indentation to the heated platen surfaces (
20
)
and (
21
).
Fig 11. Hot Warning Labels and Additional Thermocouple Holes
There are label “HOT WARNING” labels (
22
) on the Atlas™ Heated
Platens. (See
Fig 11.
) The circular aluminium heated surfaces (
20)
and (
21
) of the heated platens are the hottest parts, so take care
during operation not to touch these surfaces. They may be at a
temperature capable of causing severe burns.
23
22
20
21
