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Electrostatic film to laminate film to glass plate?
January 13 2003 at 6:24 PM | DJ Mathson (no login)
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| On Forth Dimension Holographics (FDH) site at http://www.myholostudio.com/index_usa.htm they recommend using an electrostatic transparent film to laminate holographic film to a glass plate instead of using an index matching technique. They recommend 5105CL "Penstic" Transparent film from Molco GmbH http://www.molco.com, Germany. According to the manufacturer this film has been replaced some years ago by their grade 5155CL. The difference is in the thickness of the film: 150 µm i.o. 100 µm previously. FDH say that the technique is appropriate for film sheets of 20x30cm or larger.
Have anyone tried this? Why isn´t it appropriate for smaller pieces of film, like 4"x 5"? Aren´t the electostatic forces strong enough for small pieces? Does the film curl?
DJ Mathson
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| Author | Reply |
Colin Kaminski
(no login)
| | Film Curl | January 13 2003, 10:46 PM |
I have been looking into film curl of the Slavich materials and found an interesting quote. Bjelkhagen says that the AGFA materials have a plain gelatin coating on both sides! The Slavich materials do not. I have not tested this my self. Perhaps someone with the AGFA film can tell us. I have a small sample a kind and generous holographer sent me but I have not opened the package.
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Vidar
(no login)
| | Gelantin | January 13 2003, 11:46 PM |
I have used Agfa 8E75 for many years and is still using it. This film is only coated on one side. When dry, the gelantin side is concave - when wet it is convex. You can clearly see the change during the drying process. BTW, I still have a few hundred sheets left, and they are still as sensitive and great as before, even if they are now 3 years over their estimated lifetime. I have heard that some holographers are using 10 year old Agfa and they are still in perfect condition.
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Colin Kaminski
(no login)
| | Re: Gelantin | January 21 2003, 1:05 AM |
I got a chance to ask Hans Bjelkhagen about this and I was told all film is manufacured with a 1 micron think anti-curl layer of gelatin on the back side. He has not tested the Slavich but he seemed to think it was unthinkable that they would leave it out. I guess it is what keeps the film from curling when it is dry. I'll post more from SPIE when I get some rest.
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Vidar
(no login)
| | Re: Re: Gelantin | January 22 2003, 6:56 AM |
One would think that this one-micron layer should result in a sticky feeling when touched with a wet finger, just like the business side of 8E75. Anyway, this is interesting and I look forward to hear more about this.
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