On 7/4/17 7:53 AM, Noel Chiappa via cctalk wrote: > > From: Al Kossow > > > You need moving air, though. > > I'm not sure how you do that well in a TK50 style cartridge. > > Hmm, maybe not? I start with the need for moving air - which I do not > dispute, just wondering what the needed effect is. I don't think it can be > removing out-gassed material, I think it has to be temperature leveling - > making sure the heat from the heat source is spread evenly? So one probably > doesn't need moving air inside the cartridge, _if_ its temperature is even?
This came from personal experience and was also told to me by someone very experienced in baking 1/2" computer tape. The 'out-gassed material' is water, which has been absorbed by the binder, which is hydroscopic. When I initially built my processing chamber ten years ago, I didn't have any fans in it, and the results were not good. I put 9 boxer fans into the bottom, forcing air across the surface of the tapes, which are mounted on a bar and held vertically, and the sticking reduced a LOT. When I process QIC carts, I take the covers off so the reels are exposed in the commercial food dehydrator that I use. I've never tried just putting them in without doing that. I'm skeptical that a TK50 would have been demagnetized by overtemp, the tape is much thinner though, and I could see physical damage occurring if it got too hot. https://www.google.com/patents/US6797072 http://www.richardhess.net/restoration_notes/USP5236790.pdf http://www.tapeheads.net/showthread.php?t=35353