16 Feb
2013
16 Feb
'13
8:44 p.m.
On 02/16/2013 07:51 PM, Chris Tofu wrote:
start with a disk...
Then what? smear on some rust? is it sprayed on? once you get the
chemistry correct it doesn't sound like the application portion
should be that challenging. is there an adhesive applied first?
Afterwards? Where's that Jeri lady. Get her on this LOL
Well, no, you don't start with a disk. That would be silly.
You start with a very wide blanket-on-a-roll of substrate. You mix the
binder and oxide together in a thick paste and spread them on the sheet.
I suspect that the thickness of the coating is regulated by a "doctor
blade" setup. The coating is cured and then round disks are
punched--the result is called a "cookie" for obvious reasons. It's then
verified and inserted into the jacketing medium, sealed and packaged.
The oxide coating on a 5.25" DD floppy is not much different from that
of VHS videotape. I suspect that the demise of floppy manufacturing to
more a case of video- and audiotape dying off.
--Chuck