I'm wondering if this "ripping point" might be mechanical or
thermo-mechanical. I was thinking about this after sending the below email.
if there is no "goo" on the tape, I'm wondering if somehow the tape pack
might have become damaged.
Let's do a thought experiment...imagine a fine piece of heated wire, hot
enough to melt the tape, just touching the edge of the tape pack.
That would cause the tape to weld layer to layer and generate a nick in
the edge of the tape which would facilitate the tearing. I see the
tearing akin to when you nick the edge of a piece of packing tape and it
tears, not always straight across...or like trying to remove the end of
a roll of packing tape that has stuck down without a fold-over.
Now, with the thought experiment under our belts, what type of action
could cause that type of damage? I don't know, but perhaps pressure on
the cassette shell could something into the tape pack that could cause
at least the nick, but that doesn't explain the "weld" at the "nick."
Interesting. I do think that further operations need to be on the tape
back outside of the shell. Keeping it in the shell limits the range of
motion...I know this is getting into shaky territory here and this
DEFINITELY DOES NOT CONSTITUTE PROPER ARCHIVAL RECOMMENDATIONS, but this
is already a "science project."
On 2020-11-04 12:25 p.m., Richard L. Hess wrote:
> Hi, Richard,
> That is a totally different problem. I don't recall ever seeing that in
> a DAT tape, but I have seen it in reels and cassettes.
> In the cases I've seen, the rip starts because there is both adhesion
> and damage at that point.
> In one case, it was an acetate 1/4-inch tape that had fallen behind a
> Vermont wood stove--for a winter or two--and there was some edge melting
> (and bonding) of the tape. After a good deal of work, the client and I
> decided to abandon the recovery.
> In perhaps several other cases with cassette tapes, it appeared that
> some adhesive-like material (highly sweetened coffee, perhaps?) had
> spilled into the shell. I suggested unspooling the tape and washing it
> as Dr. Bradshaw and his team did with the Challenger tape which had
> magnesium salts deposited on it by the salt water corrosion of the
> magnesium tape reels. I proposed a reasonable price (from my
> perspective) to undertake this radical treatment, but the client declined.
> So, if you can identify if this ripping is caused by adhesion and then
> identify a means of removing the adhesion, it might play.
> On 2020-11-04 7:22 a.m., Mint Records wrote:
>> Baked for 4 days. Unfortunately it doesn't seem to have worked - or
>> shed wasn't the fault in the first place. I don't know anymore. I edited
>> the tape back together, and deceased to hand wind the tape to see how it
>> was reacting. It gets to the same spot on every turn and the tape sticks
>> and starts to tear again. I'm not sure what i can now do. Perhaps it's
>> beyond help. I'm not sure 4 more days baking will do the trick. It
>> seems to
>> be that it is stuck fast at the top of the reel every so often, which
>> just rips the tape. A big giveaway that this is the case throughout the
>> tape is that the pack just doesn't move.
>> Unless anyone has any bright ideas, I think It may be the end of the road
>> for this one.
Richard L. Hess email: [log in to unmask]
Aurora, Ontario, Canada 647 479 2800
Track Format - Speed - Equalization - Azimuth - Noise Reduction
Quality tape transfers -- even from hard-to-play tapes.