How can it be that it’s freezing (it’s winter right here now) outside yet we are getting temps of
Over 37c/98f in the projection room. I mean I break out into a sweat just filling out the diary.

Would this high temp have something to with the wrap-arounds we keep getting?
Thing is, it only happens to certain prints, like one out of 10, but when they decide to stick
there is no other option than to baby-sit the print to the end, each run.

At another cinema the projection room(s) are kept at below 18c/64f, which is too cold for me,
However there seems to be no problem with sticky prints / wrap-arounds in those projection rooms.

So basically my question is what temperature should the projection room be kept at?

Bill.

 |  IP: Logged

I actually know of one theater that I service where the booth manager is a FREAK! He sets the temperature in the booth to 85F...or higher!!! Everything runs so hot I am amazed the equipment hasn't spontaneously combusted from overheating. When asked why the system is set so high, his answer is always "I'm from Florida." Well that's great and all, but myself and everyone else that works at that theater are from the planet Earth! Since he doesn't have an actual exhaust system, I am certain that a lot of his lamphouse problems and short bulb life are attributed to his keeping the booth so damned hot. (The same make/model lamphouses at another almost identical location with an identical "pseudo-exhaust above the ceiling tile" system run cool to the touch, this guy's lamphouses run burning hot. The other theater gets much better life from the same brand of xenons as well.) I also find it very difficult to work at my normal rate of productivity there because of the heat. At the end of a call to his theater, I find the job always takes me longer to complete that it does at theaters that keep the booth at a liveable temperature. I spend most of the time wiping my sweat and trying to make my brain concentrate. It's a ridiculous distraction that not only annoys me, but all of the other projectionists who complain about it every time I talk to them as well as the entire manager staff at the theater. (I'm shocked he still has a job with everyone working there being as angry about it as they are.)

 |  IP: Logged

As it turned out, the ventilation system was down.

I like to keep my booth at a comfy 65 degrees. I like it cool baby.

Excess moisture leads to "negative" curl, and the gelatin emulsion becomes sticky and soft. Use a dehumidifer or air conditioning to reduce the humidity.

Very dry conditions cause excessive "positive" curl, and allows static to build up. Heating air (winter heating) reduces the relative humidity. If conditions are too dry, use an evaporative humidifier to add moisture. Do NOT use an ultrasonic or misting humidifier that sprays water into the air --- you will find "salt" deposits from the minerals in the water, and the mist may condense on the film or electronics. Are your lamps properly vented to the outside?

I have found that in our booth, humidity plays a bigger role than heat, although I haven't found a good way to maintain a decent level of humidity in the winter. We can run humidifiers all night, but 10 minutes after you flip on the exhaust switches, it's the same as the outside air. I will say, however, that it's been a very long time since we've had a brain wrap caused by static, so maybe the film stock is made a little different lately?

I'm also wondering, do most of you have a seperate HVAC unit for your booth, or do you just rip some air from the auditoriums?

Yes, Kodak VISION Color Print Films have a transparent conductive anti-static layer on the back side of the film:
Technical Data for 2383
Features of 2393
Introduction of Kodak VISION Color Print films

------------------
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

 |  IP: Logged

 |  IP: Logged

My booth used to be tied into a the auditorium HVAC. Our film curled and we scratched . Two months ago the museum purchased a 20000$ HVAC and retrofited so Booth now has a closed system. WE are perfect now. Large format and a linear loop projector require that stability in enviroment or it looks like Kim chee all over the screen. In the shopping center booths I have worked in it Hvac has always been tied into booth and auditorium. Most theater chains just don't understand the importance of humidity and temp.