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Dryer box Answered

I'm been looking for instructions on making a box to dry  a 8.5" x 11" piece of "film". I can make the box, it's the electronics part I can't figure out.  My idea is that a small heater on one end of the box, and a small exhaust fan on the other end will be sufficient to dry my film.  Does this make sense?

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jrav
jrav

11 years ago

The timer, humidity and temperature sensors would certainly be a nice addition, but they are far too ambitious for me to consider.

Reclaiming the hear/airflow from the pc power supply is an ingenious idea!!

I did a little test...

A 1 litre ice cream type container tight against the back of the power supply fan, held in place with a stick, and proped up the end so the container would sit flush with the pc case. It quickly filled with warm air. I place a small wet negative inside and it did dry, but it took a couple of hours. Note that we are having a very damp day, so this couple hours is quicker than hanging it in room air.

I thought the gap between the stick and the top of the container would be enough to vent the moist air, but perhaps not. Would a few strategically placed holes in the opposite end of the container be enough of a vent? Or is venting not an issue?

If I can get this to work, I'll make a box to sit on top of the pc, and use clothes dryer hosing to direct the power supply air, but I'm concerned there won't be enough air for the larger box.

Any thoughts or suggestions would be greatly appreciated.

dryer-v1.jpg
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caitlinsdad
caitlinsdad

Reply 11 years ago

You would want to evacuate all of that humid air as soon as possible. I think you can even set up a large 5-gallon bucket or whatever litre size containers is normal, plug the ducted hose in the bottom, leave the top open to hang your negatives if possible - or cookie rack if horizontal.  There is enough hot air to rise by convection and the fan.  You want to create a "wind tunnel" type of device to get as much air moving across your negatives.  You can buy additional case fans for your PC that would be powered by the PC wiring harnesses inside to increase the air flow if needed.

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caitlinsdad
caitlinsdad

11 years ago

 I guess you could just rig up a hair dryer to a hole in the box and have an exhaust port out the other end.  But I think that may be too much heat and the airflow may just blow the contents around.  Maybe you could just duct the airflow from the back of the computer power supply to get just enough heat and airflow.  I don't know if you thought about having it on a timer or shut off by sensing the humidity or temp in the box.  Good luck.