It sounds just like the 8mm problem. What I would do is twist the supply
reel half a turn in the direction opposite the ripping side, so that the
tape is leaving the pack from the other edge first. I find this to be a
good solution for 8mm. Should work just fine for DAT, although since it is
just a hub with 4mm tape on it, I would say good luck getting it on the
takeup hub. As I recall they are not flat like a cassette, so reeling it on
a table is not an option, perhaps only in the shell. I would love to give
this a try.
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On Wed, Nov 4, 2020 at 7:49 PM Richard L. Hess <[log in to unmask]>
> Hi, Richard,
> 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."
> Good luck!
> 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
> > So, if you can identify if this ripping is caused by adhesion and then
> > identify a means of removing the adhesion, it might play.
> > Cheers,
> > Richard
> > On 2020-11-04 7:22 a.m., Mint Records wrote:
> >> Baked for 4 days. Unfortunately it doesn't seem to have worked - or
> >> sticky
> >> 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
> >> then
> >> 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
> >> for this one.
> Richard L. Hess email: [log in to unmask]
> Aurora, Ontario, Canada 647 479 2800
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