|
|
Author
|
Topic: RealD port glass problem
|
Zlatko Jelacic
Film Handler
Posts: 2
From: Zagreb, Croatia, HR
Registered: Mar 2011
|
posted 03-09-2011 06:25 PM
Lectori salutem to all of you, Cinema Pros. Glad to be here.
A problem worth registering ...
It seems there's a little mess on the topic of port window glass. We have a situation where we have to use fire rated glass (up to 60 mins) in combination with RealD.
The most available FR glass on the European market is Pyran S-AR by Schott, but is tempered. RealD does not like tempered glass, but laminated.
Suggestion in RealD paper is Pilkington Pyrodur, but is not anti-reflective. And as I've been told by the very helpful and friendly guys from Pilkington, Pyrodur is not recommended for the 3D applications according to some test made by UK exhibitors. They recommended Pyroclear, another Pilkington product, but with special AR coating made by another UK company. But then, this AR coating is restricted in sizes.
Seems I'm missing something. Could it be that there's no fire-rated, anti-reflective glass out of the factory, which is not tempered and therefore is convenient for RealD?
How did you others, the proud owners of RealD in fire protection booths, solved this problem? Thank you in advance for your valuable comments.
| IP: Logged
|
|
|
|
Frank Angel
Film God
![](http://www.film-tech.com/ubbmembers/248b.jpg)
Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
|
posted 03-12-2011 04:29 AM
Given the difficulty you are having obtaining a compatible FR glass, you might want to check with the inspectors and whoever it is that enforces those regulations and see if traditional fire shutters would be an acceptable substitute for the FR glass -- they perform the exact same function as fire glass, i.e., stop fire from migrating out of the booth into the auditorium.
I think if those regulators are ruled by logic, they would have to admit that the fire shutters which were used for decades during the era of nitrate film, would certainly fully protect the hall from a booth fire. Nitrate fires were a much bigger threat than anything that could happen in a booth today.
And fortunately, a fire shutter mechanism is very inexpensive (MUCH cheaper I expect than the special fire rated glass that is mandated) and can be easily obtained from any used cinema supply house. Hell, if you were closer, I'd send you our old ones. OR you can fabricate them yourself VERY easily with slab of steel -- the trick is the small fusable link -- a small hook made of two pieces of metal that are held together with solder which hold the steel shutter above the projection port. In the event of a fire, the solder melts and lets the slab of steel fall in front of the booth port, sealing it. The sliding steel shutter is kept in place with runners.
Seems that is a very easy solution, very cheap and easy to build if need be.
BTW, what's with RealD that they can't use particular types of glass? What does it do to the image?
Next question -- how often do inspectors come and check to see what kind of glass is in the booth ports? And how can you even tell if it is that specific type of glass?
| IP: Logged
|
|
|
|
|
|
|
Marin Zorica
Jedi Master Film Handler
![](/ubbmembers/1716a.jpg)
Posts: 671
From: Biograd na Moru, Croatia
Registered: May 2003
|
posted 03-14-2011 12:36 PM
I'm going to be little OT, but thing did remind me to this, why all they made soo big port windows today, if there is some fire-proff aprovement, why port windows can be just fitted smaller so that it fits projectors and one for projectionist?
Next, I see Zlatko is from Croatia like I, there is verry little things about cinema in it concidering law, mostly things are same for theatres, cinemas and all kind of auditoriums. As it could be good to cut out big port glass and just fit in smaller which permits RealD to be good, but then, on other hand you need to check with some inspector if that can get aprovement!
| IP: Logged
|
|
|
|
|
All times are Central (GMT -6:00)
|
|
Powered by Infopop Corporation
UBB.classicTM
6.3.1.2
The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion
and agrees to release the authors from any and all liability.
|