Ideal and max temperature for dryng film

[13Promet]

I'm planning to build a DYI film dryer by using a PVC pipe to insert the reels in, and a hair dryer as a source of air/heat.
Of course I will be filtering the intake to prevent the dust from entering the canister.

There's one information I need to use the correct amount of heating power from the hair dryier, and in case modify it by employing resistors in order to be within safety limits: which is the ideal temperature for drying a neg, and the maximum one that it can get without being damaged?

Thank you in advance for any support!

 

[mcfingon]

The only tip I can offer from experience is that I hand-hold a hair-dryer in winter to dry film quickly. I would say the safe temperature is what is bearable on your fingers while running the film through it. Measure that temperature to make it objective. My guess would be 50 degrees celsius. - I just measured the temp and came up with 50 degrees being just bearable. Maybe 40 may be safer.

 

[mcfingon]

Max time is harder as I just run the hairdryer for 30 seconds or so, checking to watch the film dry by eye. The shorter the better in terms of minimizing dust.

 

[bmattock]

I think drying in the reel may be a mistake. Curly negs are not fun to print or scan.

 

[newsgrunt]

but if you reverse roll them onto the reels for drying, it takes away the curl and flattens out the film's tendency to bow as well 😉

 

[bmattock]

but if you reverse roll them onto the reels for drying, it takes away the curl and flattens out the film's tendency to bow as well 😉

Interesting. Never tried that. However, hanging straight has always worked for me, without fear of reticulation. I have patience enough to wait.

 

[btgc]

I've spooled backwards after film is dry. Next morning it's flat for scanning without week under heap of books (never ever tried that long method).

In a bathroom film dries in 20-30 minutes. What's the need for speed, I see a PJ on assignment? Of course, that's not my business. I just think forced drying of film yet has to be done correctly without doing more damage than benefits....

 

[13Promet]

The only tip I can offer from experience is that I hand-hold a hair-dryer in winter to dry film quickly. I would say the safe temperature is what is bearable on your fingers while running the film through it. Measure that temperature to make it objective. My guess would be 50 degrees celsius. - I just measured the temp and came up with 50 degrees being just bearable. Maybe 40 may be safer.

Thank you, very useful!
I will be employing a closed pipe with a filtered intake on one end and exhausts on the other one in order to avoid dusting.

 

[13Promet]

In a bathroom film dries in 20-30 minutes. What's the need for speed, I see a PJ on assignment? Of course, that's not my business. I just think forced drying of film yet has to be done correctly without doing more damage than benefits....

Winter temperature in my bathroom is about 18°, so it takes much longer that that to dry.
Moreover, it can't be completely sealed when closed, so I'm getting air currents in it.
As a result, i get too much dust on the negatives.
It's not a matter of time.
That's why I'm willing to build this very cheap and simple dryer.