User Manual
36
Note 2: Spacer Rings - Tolerances and Film Thickness
The spacer rings (
18
) have been manufactured such that the sample
thickness tolerances are +/- 3 microns for rings A and B and +/- 10
microns for all other rings. The tolerance limit relates to the absolute
overall thickness
produced for a pressed film. The spacer ring (
18
)
thickness as marked allows for a
nominal
thickness of film to be
produced within a particular methodology or operational procedure and
the size of the spacer ring (
18
) is an indication of, potentially,
the
minimum film thickness
that can be produced using this appropriate
thickness spacer ring. E.g. if a film of between 25 microns and 50
microns thickness is to be made, then the spacer ring
B
(
18
) for 25
micron thick films should be used and any film thickness produced will
have an expected tolerance limit thickness of +/- 3 microns.
For a consistent “pressing cycle procedure” to be established that
allows for a high degree of reproducibility for a film to be made from
any spacer ring (
18
) size being used, the following factors need to be
considered:-
● The size of spacer ring (
18
) used.
● The positioning of the foil discs (
21
) if thin films with fringing patterns
are to be prepared.
● The quantity of sample used for the spacer ring (
18
) size that is
chosen.
● The temperature of the sample (
set
on the 4000 Series controller).
● The tonnage load applied whilst the sample is hot and compressible.
● The tonnage load applied (if any) whilst the sample is cooling.
● The temperature of the cooling sample when it is removed from the
High Temperature Film Maker Accessory.
Both the top (
13
) and lower (
14
) platen polished surfaces are
removable from their respective heated pressing assemblies (
4
) and
(
5
) by releasing their three fixing screws in each case. (See
Fig 20.
)
If the polished surfaces deteriorate over time, it may be possible to
improve their surface condition from a re-polishing (if any blemishes or
imperfections are not too severe), by removal of the polished surfaces
from their heated pressing assembly to use against a suitable flat
Содержание Atlas GS15800
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