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This topic comprises 4 pages: 1 2 3 4
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Topic: Filmguard in So. Cal?
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-22-2002 09:25 AM
The March 1980 issue of Kodak's "Film Notes for Reel People" (publication H-50-10) had photos of the Christie FC-1 cleaner, United Artists Film Cleaner (Joe Kelly's unit), and the 3M Masterwipe Film Cleaner, which all used dry woven webs as the cleaning media.------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-23-2002 10:20 AM
William Parr said: "My big problem I had in using them was it was a brand new building which meant that while I was trying to train booth staff and even on opening day, they were still cutting and hanging sheetrock in my booth. which meant that I had dust everywhere. I could have the staff wipe down all the surfaces in the booth and 30 minutes later it was all covered in dust again. This lead to the PTR's Being completly full about 1/3 of the way throughthe show. I never was able to completley clean a print in one shot using them. I do understand from talking with the person who became booth manager after I left that once the dust settled the PTR's became great to use."Your experience supports Kodak's initial testing of PTRs. Even when filled with abrasive dirt, PTRs have very low risk of scratching film. We actually tested this by scraping sandpaper grit onto the surface of PTRs and then cleaning camera negative film. Even after multiple passes over the dirt-laden surface of the PTR, the negative was unscratched because of the rolling contact and soft urethane PTR material. When the PTR surface is completely covered with dirt, it loses cleaning effectiveness, but will not damage film. I have seen cases where dry media cleaners have scratched prints from head to tail when abrasive construction dirt was picked up from the print, literally turning the woven media into a piece of sandpaper.  For film cleaning "there are different horses for different courses". PTRs are ideally suited to situations where you do not want to apply chemicals or solvents to the film, and the dirt levels do not exceed the capacity of the PTRs between routine cleanings. With simple washing after each show (either in water or with "see-saw" of adhesive tape), they can clean millions of feet of film. PTRs are a simple and effective FILM CLEANER, they are not a FILM TREATMENT that changes the properties of the film itself.  ------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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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 07-23-2002 02:39 PM
It all boils down to effectiveness. The next time someone armed with FilmGuard, a media cleaner and a set of PTRs opens a new theater that has construction dirt everywhere, pick two identical prints (same lab, same film stock, preferably same movie title) and run PTRs on one and FilmGuard on the other. The PTR print will be a joke within a day or two with all of the dirt. The FilmGuard print will still be sparkling months down the road. PTRs only have a chance if the booth environment is kept in sterile condition, which is rarely the case in a commercial booth.Or you can consider it this way, every time you run PTRs part of the stickiness is wearing off. As such, every time you clean a print with PTRs the PTRs become less and less effective over the useful life of a print. With a media cleaner and FilmGuard, you get the "brand new" effect over and over and whether the test is done in a white glove type of environment or in a torture test (aka: construction dirt areas) FilmGuard is the clear winner everytime whether you are working in a flawlessly clean environment, or projecting with construction dirt.
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-23-2002 03:34 PM
"Different horses for different courses".  BTW, the PTR "stickiness" is not from an adhesive or additive. It comes from the surface finish of the polyurethane that was chosen. Any loss of effectiveness with age is due to surface contamination (that can be washed off), physical wear, or improper storage (e.g., excessive temperature). A quick way to test the effectiveness is to roll the PTR over a smooth dusty surface (e.g., the dusty top of a filing cabinet) and observe whether 95% of the dust particles are picked up. ------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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