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Author
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Topic: Get the dust outtathere
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John Pytlak
Film God
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Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 01-24-2003 08:06 AM
Attempting to clean a print with a dry cloth or dry media cleaner risks scratching the print. Even if the cloth is soft, any abrasive dirt on the print can get caught and then scratch the print. I've seen an entire print trashed by a dry media cleaner that had picked up enough abrasive dirt to look like a roll of sandpaper (in a theatre where construction dust had gotten on a print).
Ideally, a central vacuum cleaning system should be installed. Most vacuum cleaners and shop vacs have relatively inefficient filters that put lots of small dirt particles back into the air. A vacuum that uses a true HEPA (High Efficiency Particulate Air) filter, or a water filter to trap the tiniest sub-micron sized dirt particles is another good alternative. Where possible, wiping surfaces with a damp sponge or mop works well too.
If your booth does not have good (HEPA) filtration of the incoming air, consider the use of stand-alone HEPA air cleaners.
Here are some links to HEPA air cleaners and vacuum cleaners:
http://www.aircleaners.com/
http://www.allergybuyersclubshopping.com/vacuumcleaners.html
http://www.airfilterstore.com/iqair/
http://www.allergybegone.com/hepvacclean.html
http://www.domotecuk.com/water.htm
http://www.beststuff.co.uk/yes_hydro.htm
Kodak recommends maintaining a relative humidity of 50 to 60 percent RH in film handling areas (long term storage should be at lower humidities). At very low humidities, static charge can build up, which attracts airborne dirt particles to the film and any non-conductive surfaces the film may contact.
It's a good idea to restrict the projection room to only the people working there. Likewise, avoid using the projection room as a general storage area, which is harder to keep clean, and generates extra traffic through the area. Clean, non-linting clothing should be worn and dirty shoes/boots left at the door (adhesive door mats can be used to remove dirt from the bottom of shoes).
Cleanrooms Magazine is a trade magazine that contains articles and equipment for industries where cleanliness is very important:
http://cr.pennnet.com/home.cfm
Although showing film does not require the same degree of cleanliness as manufacturing disk drives or microcircuits, some of the principles can be applied to controlling dirt in the projection room.
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