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This topic comprises 3 pages: 1 2 3
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Author
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Topic: Wet gate projection
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Mark
unregistered
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posted 06-04-1999 06:08 PM
I was looking at the pictures of this site and I saw that one of the captions said that this theater is equiped for "wet gate projection". Now, I've heard of wet gate printing, where a film is immersed in a liquid before entering the printer (which helps to cover up scratches by slightly filling them in) but I've never heard of this term used in projection before. Did I miss something? How does this work, and what are the benifits?
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Brad Miller
unregistered
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posted 06-04-1999 06:09 PM
Wet gate projection is what most people would call it. For lack of a decided-upon name it is referred to as P-5. In the simplest terms, P-5 is a lubricant that will not deteriorate the polyestar base unlike other lubricants. It does not dry out and evaporate within seconds like other popular film cleaners (Renovex, Vitafilm, Filmrenew, RTI, etc) but is designed to stay on the print in liquid form. The P-5 is applied through the use of a normal media-type film cleaner (soaking the pads in it) and for optimum results the pads are rewound and run again after every show and reused for one week at a time. Just one application will make the film run substantially quieter and smoother. The picture will be more steady and have better focus. After multiple applications a nice thin layer is formed on the print, which will cover up scratches and dirt. The way the P-5 covers up scratches is exactly like wet gate printing does. Again to put it in simple terms, the light is refracted through the liquid coating bending the light ever so slightly and giving the appearance of a scratch free print. Granted, this won't eliminate heavy emulsion scratches, but virtually all base side scratches will no longer project and over a bit of time will discolor emulsion scratches to project black. As to dirt, the constant cleaning through the media cleaners keeps the print perfectly clean without being abrasive. If the P-5 applications is stopped then obviously dirt will start being attracted as normal. However, the thickness of the P-5 coating will keep the dirt layer out of focus during projection and one swipe of the cleaner (even a dry one) will knock all the dirt off again. Another benefit of the P-5 cleaner is the stopping of vinear syndrome. In test prints of early stage vinegar syndrome, applying P-5 would knock out the smell and as of about 5 years the films have not deteriorated. P-5 will also work nicely on prints that are starting to shrink. However, both of the above must be caught in time. Obviously an unrunnable print cannot be magically restored to runnable condition. P-5 will however make a print run smooth that was on it's last days and prevent it from deteriorating more. How much longer is unknown as the product has only been in testing for 10 years. Still though, for new theaters and new prints, applying P-5 will keep them in better than brand new condition (because of shipping dirt) for months and months of constant running. Take for example the scene in Matrix where Keanu Reeves and Lawrence Fishburne are in the "white" room (basically clear film except for the actors and two chairs). Imagine this looking as clean as a DVD even after running for 6 months! That's what P-5 does. P-5 has been in constant testing for 8-10 years now at various theaters under varying conditions and equipment. There have been no side effects or negative feedback whatsoever. The UA Galaxy is a test theater. Hopefully it will be on the market next year.
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Chris Trainor
unregistered
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posted 06-04-1999 06:10 PM
Wow, that stuff sounds cool. I'd love to get one of those systems for my film collection. Will probably help preserve the films quite a bit.
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Christopher Seo
unregistered
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posted 06-04-1999 06:12 PM
Glad to see this product is making progress. I still don't quite understand its method of working, though. You say P-5 will stay on the print in liquid form. Therefore, how permanent is this coating? I understand its function as a general purpose film cleaner which should be regularly used to keep new dirt and new scratches away, but will it have to be applied constantly in order to keep existing scratches from showing and vinegar prints from further deteriorating? Can it be removed or washed off from the print or would this never be necessary? Basically, I'm not sure if it is intended as something to be used just when the print is used, or something that always stays on the film.
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Brad Miller
unregistered
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posted 06-04-1999 06:14 PM
The coating will stay on a print for months, or longer in some storage conditions. Eventually though, it will evaporate away from time. So yes, it must be reapplied for archive/collector prints whenever they are ran to ensure they stay in top condition. However, it takes about the same time to set a cleaner up for running as opposed to cleaning the projector head after a show...so as far as extra trouble goes, it really isn't an extra burden.
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Mark
unregistered
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posted 06-04-1999 06:14 PM
I'm still not quite clear on this: where does the application process take place? Is this something that is in line with the thread path (after the feed platter)? Or is it applied on platter make up? From the photos of the UA 9, I can't quite make out the applicator. Thanks. . .
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Brad Miller
unregistered
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posted 06-04-1999 06:15 PM
The applicator is a normal media cleaner. It is mounted on the side of the platter before the film gets to the projector.
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Brad Miller
Administrator
Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99
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posted 07-11-1999 03:22 PM
UPDATE:We are gearing up for commercial production on the film cleaning/lubricant commonly referred to as P-5. Our patent lawyers expect us to be able to release the product within a couple of months. We have also added another test theater: The Mann Chinese in Denver, Colorado. Joe Redifer will be testing it up there for us. He has agreed to report his findings here on the forum and will try to rejuvenate a two month old print of Phantom Menace to "lab new" conditions. He will also be putting it to the real test of performing ONLY intermittent cleaning, instead of the recommended constant cleaning. We look forward to hearing your results, Joe.
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