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Temporal
Lamination
Holography
materials are manufactured on glass and TAC film substrates. The
temporary film lamination technique described below is an
alternative to the well-known index matching technique and is
easier and less time-consuming. The technique is appropriate for
film sheets of 20x30cm or larger.
We recommend using an electrostatic transparent film similar to
the 5105CL “Penstic” Transparent film from Molco GmbH (www.molco.com),
Germany (Note: PENSTICK 5105 CL is now replaced by PENSTICK 5155
CL. (6 MIL instead of 4 MIL)). The procedure is as follows.
1. Clean a glass plate and place it horizontally. The plate should
be slightly bigger than the actual film.
2. With a soft brush create an electrostatic charge on the glass
plate.
3. Apply the electrostatic film to the glass plate with a
(photographic) rubber roller making sure that you eliminate all
the air bubbles.
4. Again take a soft brush and create an electrostatic charge on
the electrostatic film.
5. Apply the holographic film to the electrostatic film with the
rubber roller making sure, once again, that you eliminate all the
bubbles.
6. Now use the glass plate as you would a normal holographic
plate.
7. After making an exposure (and latensification) simply peel off
your photosensitive film and process it as described in this web
site.
Another technique useful to achieve the necessary flatness for the
recording of film holograms smaller than 20x30cm is to put the
film between two glass plates.
Final Lamination
The emulsion of
holograms made on film and glass plates should be protected from
humidity and UV light. The diffusion of water into the emulsion
leads to the colour of the hologram changing. UV radiation causes
hologram brightness degradation (the "print out"
effect). In order to protect the hologram from these unwanted
effects one may cover and seal the hologram on one or both faces.
In the case of glass holograms sealing from the back side is
sufficient whereas film holograms should be sealed both from the
front and the back.
The best way to protect the back side (the emulsion) of reflection
holograms is by lamination of a black self-adhesive film. We
recommend “Black Oracal” 641-070M from Orafol GmbH, Germany (www.orafol.de),
or a similar product. It is straight-forward to apply this black
film to the emulsion side of the hologram using a photographic
rubber roller. Alternatively a cold lamination machine may be
used. The result is a sandwich consisting of the holographic
substrate, the emulsion and the protective film.
For emulsion protection of transmission film holograms we
recommend the use of a transparent double-sided self-adhesive film
(e.g. Optimount 60238 from Hunt Graphics Europe Ltd.) and a
Plexiglas sheet (e.g. Plexiglas XT, from Rohm GmbH, Germany, www.roem.de).
One side of the double-sided film is applied to the emulsion side
of the hologram and the other side is stuck to the Plexiglas. This
can be done either by hand (rubber roller) or by using a cold
lamination machine. The result is a sandwich consisting of
holofilm substrate, emulsion, adhesive and Plexiglas.
In order to insure flatness of film reflection holograms the same
technique of mounting to a Plexiglas sheet using a doublesided
film may be used. The result is a sandwich consisting of the film
substrate, the emulsion, a black self-adhesive film, the
double-sided self-adhesive film and finally the Plexiglas sheet.
Front-side protection of the hologram from UV radiation can be
effected by use of the standard UV reflecting films available from
Edmond Scientific(www.edsci.com). |
