Hoefer SE400 - Manual (Page 17)

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p9
2-gel sandwich
A 16- or 24-cm long notched divider plate (ordered
separately) doubles the number of gels that can be
cast and run (see Fig 3).
Assemble in the same manner as a single gel sand-
wich, except before placing the top glass plate, lay
the divider plate atop the first set of spacers and a
second set of spacers atop the divider plate. Place the
notch so that it will be at the top of the gels. As with
a regular sandwich, it is essential that the spacers and
plates align perfectly in order to create a seal.
5
Inspect the bottom of the sandwich to make sure that
edges are aligned flush in order to ensure a complete
seal. Adjust if necessary (see Fig 4).
Optional: Apply a light film of GelSeal only on the
bottom outside corners if your sandwiches tend to
leak. Do not use silicone grease or petroleum jelly
to seal the sandwich because these substances are
difficult to remove and ultimately may cause artifacts
in the gel.
6
Place the laminated gasket into the casting cradle
with the foam side down. Place the glass plate
assembly in the casting cradle, screw side facing
out (see Fig 5).
24-cm plates: Place the sandwich so that the short
clamps are at the bottom.
7
Insert a cam into the hole on each side of the casting
tray with the ridge (short end) pointing up. Seal the
gel sandwich by turning both cams as far as needed,
usually 90° to 150°, up to 180°. The cam action
presses the plates into the gasket to seal the bottom
of the sandwich. The seal is complete once the glass
edge appears darker and nearly transparent against
the gasket. Do not tighten the cam past this point.
Tip: Remove the laminated
gasket from the cradle and use
the casting cradle to hold the
sandwich for alignment.
Fig 4. Sandwich assembly:
Inspect glass plates for nicks.
Use only unchipped plates to
prevent leaking.
pressure bar
both top and bottom
sandwich edges must
be flush with the
clamp guide ridges.
Fig 3. 2-gel sandwich assembly:
2-gel sandwiches are limited to
thinner gels; no spacers thicker
than 1.5 mm can be used.
glass plates
(at the outer sides
of the sandwich)
spacers
notched
divider plate