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Please tell us more about the "grandfather clock" tape recovery machine.

Mark 

-----Original Message-----
From: Association for Recorded Sound Discussion List
[mailto:[log in to unmask]] On Behalf Of Shai Drori
Sent: Wednesday, 16 December 2009 8:12 AM
To: [log in to unmask]
Subject: Re: [ARSCLIST] Tape Shed-Sticking & stripping

This reminds me of the "grandfather clock" thingamajig I saw at the
British library. It is a large board with rollers that the tape goes
through making a serpentine. The tape travels very slowly and can be
heated or chilled as needed. They made this for some agfa tapes that
stuck. I have never had a 3m 176 make trouble but this sounds like many
50's 60's tapes I transfered that were of American origin. One squealed
so bad we had to soak it with silicone. I am wondering it there is a
benefit to slow winding under a cold air blast, like an air conditioning
duct pointing at the transport. My a/c/ has a setting for drying the
air. Very cold air forced out and the rh drops very fast..
Shai

Richard L. Hess wrote:
> Hi, Martin,
>
> This is very problematic, and I do NOT think baking is a good idea.
>
> There is a CHANCE that month-long cold soak in a desiccated atmosphere

> (silica gel inside double freezer (or foil) Zip-Loc bags in the fridge

> (not freezer)).
>
> It has worked for some 3M 176 that showed this symptom. It has also 
> not worked for other tapes. Jim Wheeler gave me this technique. I 
> don't know his source. I haven't used it much.
>
> The other thing to try is VERY slow unwinding - 1.88 in/s or slower. 
> Sometimes that alone helps.
>
> The tape in the photo was baked based on a consensus of the people at 
> the seminar (including the tape owner) because we didn't have time for

> cold soak and we wanted to see what would work (or not).
>
> Since that article, I have had good results with 3M201 which had the 
> same problem and the 1.88 in/s wind-through solved it.
>
> Good luck!
>
> Cheers,
>
> Richard
>
> At 12:34 PM 2009-12-15, Martin Fisher wrote:
>> Got a polyester/plastic non-backcoated reel in which the binder is 
>> stripping off onto the adjacent wind.  AKA "binder adhesion to back 
>> of next layer" on Richard Hess' site.
>>
>> http://richardhess.com/notes/2006/05/26/binder-adhesion-to-back-of-ne
>> xt-layer/
>>
>>
>> Might baking be a solution for this?
>>
>> Martin
>
> Richard L. Hess                   email: [log in to unmask]
> Aurora, Ontario, Canada       (905) 713 6733     1-877-TAPE-FIX
> Detailed contact information: 
> http://www.richardhess.com/tape/contact.htm
> Quality tape transfers -- even from hard-to-play tapes.