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Author Topic: Silver 3d paint? Frank Angel Film God Posts: 5305 From: Brooklyn NY USA Registered: Dec 1999 posted 04-11-2011 08:31 PM                        quote: Sam D. Chavez Micro-Perfs seem to be more susceptible to Moire patterns. Sam, I thought micro-perfs were introduced as a way of reducing the chance of moire patterns?  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 04-11-2011 10:59 PM                       Nope, Micro-perf screens have been around a lot longer than D-cinema projectors. More holes = more audio, esp. in the high freq. end of the spectrum.  |  IP: Logged Catalin Balaceanu Film Handler Posts: 36 From: Pascani, Iasi, Romania Registered: Mar 2006 posted 04-12-2011 08:56 AM                        anybody?  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 04-12-2011 01:20 PM                     I was involved with Imax screen painting years ago and I just can't recommend it to anyone. Getting a good looking silver screen painted on site is really difficult. Back then, Imax used a robot system that scanned a spray gun over the screen. This involved erecting a frame with horizontal rails that a vertical truss moved across, the spray head was on a part that moved up and down the vertical truss. We would load the paint pot with enough paint for the whole screen and start the system which would then scan the truss back and forth as the spray head moved down. After a few hours of this we could finally see if the screen looked good... if not, put up a new sheet, make adjustments, and try again. Maybe newer spray nozzles are better but I recall plenty of grief from the ones we used. An earlier system moved the spray head back and forth horizontally at the bottom of the screen frame as a folded screen sheet was pulled out of a box: this was not very successful and abandoned in favor of the robo-sprayer. I don't know much about the paints, we used a solvent based paint at first - probably illegal now and requiring humingous exhaust fans to avoid an explosive atmosphere in the auditorium - and a water based paint. Both required pressurized paint pots with power stirrers to keep the aluminum particles suspended evenly. Then there's the screen surface. I don't know whether a used screen would work, it will be covered with who knows what pollution. The paint might droplet up on application or just drop off in strips after a while. Imax had to supply at least two screen sheets to each site in case of problems... a clogged spray head partly through the job would be disastrous. The early pull-up system never produced a perfect screen, the robo-painter was much better. You can really see any variations in the silver paint coating and avoiding stripes or splotches is extremely difficult. I don't know what Imax do now but if there's a way to ship a huge silver screen without damage I'm sure that's the way to do it. I saw pictures of one screen factory where they hung the screens and used a robo-sprayer... probably Imax got the idea from them.  |  IP: Logged Catalin Balaceanu Film Handler Posts: 36 From: Pascani, Iasi, Romania Registered: Mar 2006 posted 04-14-2011 08:03 AM                        Thanks Dave. Oh well, this sounds overwhelming enough for me to scrap the whole repainting idea. Any recommendations for decently priced silver screens? ...if these exist? thanks  |  IP: Logged Richard Hamilton Phenomenal Film Handler Posts: 1341 From: Evansville, Indiana Registered: Jan 2000 posted 04-14-2011 09:35 AM                     Contact Bobby or Pam at Franklin Designs I've done a lot of work with him and he's a good guy to deal with. Rick  |  IP: Logged

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