[Table of Contents]


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[ARSCLIST] Fwd: [ARSCLIST] Another little chemistry observation



  Richard is correct about Scotch/3M auto-threading reels. They were and are 
a menace. Another bad, apparently untested idea passed off as progress. I used 
a few when they were introduced during the 1960s. Some years later I noticed 
just what Richard mentioned: the tape on the inside of the spools was sticky 
and irremediably damaged. The leaking adhesive had made the coating containing 
the sound glue to the top of the layer wound below. My tapes were Mylar, not 
acetate, but it didn't matter.

  Don Tait
I just transferred a reel of acetate tape that had been stored on a Scotch/3M auto-threading reel. It has solid sides (no windows) and three springy clips in the walls near the hubs. From the outside, the clips are chrome-ish. From the inside they are green.

There was some starting of blocking (layer-to-layer adhesion) of the wraps of tape near the hub.

There was no significant vinegar smell.

The tape/reel had been stored at approx. 21C 43%RH with limited swings for the last year, prior to that I don't know, but I think it had been in climate controlled storage.

I suspect this odd reel is not allowing the centre of the tape back to breathe much and concentrating whatever outgassing of the tape pack. Also, another very loose tape pack on the outside (not in the centre).

I'm not sure what this means, but I would think this supports the need to at least examine the acetate tapes in your collection and also look especially if you have this reel.

Cheers,

Richard

Richard L. Hess email: richard@xxxxxxxxxxxxxxx
Vignettes Media web: http://www.richardhess.com/tape/
Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX
Detailed contact information: http://www.richardhess.com/tape/contact.htm

[Subject index] [Index for current month] [Table of Contents]