Whoa - wait a minute.
Isn't binder hydrolysis (sticky shed) totally different than binder
delamination? Would you really want to bake tapes with oxide
delamination???? Some tapes may have sticky shed so bad that it appears
to be "delaminating" as you play them, but I'm not so sure that you'd
want to bake tapes where the binder is actually flaking off of the tapes
just by handling them. I have not yet had to work with true binder
delamination (and hope I never will) but from what I know, that's a
totally different animal not to be to confused with sticky shed!!! (and
I've yet to see anyone out there reveal any simple solution to easily
fix or stabilize binder delaminated tapes). Just my two cents. Suzanne
if you have more information, please share it!
On 7/16/2013 3:47 PM, Sue Bolstad wrote:
> Dear Greg, We have run into the same problem with some of our very early recordings and developed a means to deal with it, which may be of use to you;
> The handling has been to bake the tapes under controlled conditions. This means using a stable temperature (approx 120 degrees) for many hours (at least 8 hours). The baking is done in a convection oven which circulates the heat evenly throughout the oven. The tape is then allowed to slowly cool over approximately the same time period as was used for baking it. The tape is then good for approximately a month, during which time it should be copied." I also have an article from 1997 which describes the phenomena and the procedures if you are interested.
> From: Greg Schmitz [[log in to unmask]]
> Sent: Monday, July 15, 2013 11:36 PM
> To: [log in to unmask]
> Subject: [ARSCLIST] Conservation question: oxide delamination and consolidation
> At some point in the future the archive I work for may have to deal with
> hundreds, perhaps thousands, of helical audio recordings made in Alaska
> using Soundscriber SS-124s (helical recorders which capable of recording
> 24 hours on a 2 inch tape medium). When we conducted a brief and spotty
> inspection a couple of years ago of the tapes, recorded in the early
> 1960s, now stored a warehouse without climate controls, we found that
> many of the tapes showed signs of de-lamination; the oxide coating is
> flaking off of the base of many tapes. I'm trying to get ahead of the
> curve and was wondering if anybody here could point me to literature, or
> offer advice, on consolidating magentic audio tape oxide coatings?
> Thanks in advance.
> --greg schmitz
> Greg Schmitz
> Alaska Moving Image Preservation Association (AMIPA)
> Anchorage, Alaska
> greg /at/ amipa.org
> The Alaska Moving Image Preservation Association is a 501(c)(3) non-profit dedicated to media preservation and education to ensure long-term access to Alaska’s moving image heritage.