Wie rettet man klebende Bänder?

[Peter Ruhrberg]

Von Richard Hess' Webseite:

Baking (or incubation) times are getting longer, and 12 hours is not uncommon for 1/4-inch wide tapes. Some tapes need to be re-baked after partial unwinding due to centre-of-reel increased inter-layer pressures. There is some discussion of pressures and tensions here.

If these are squealing and leaving significant deposits, they should be baked (at your own risk). The now-expired Ampex patent for baking tapes can be found here. Almost all SSS tapes are back-coated tapes and the interaction between the magnetic coating and the back coating may be part of the problem.

Tapes which squeal (and generally leave less of a deposit and are generally not back coated) appear to be suffering from SBS. SBS appears to be a change in the glass transition temperature of the magnetic coating. The glass transition temperature (Tg) is the point where the plastic turns from smooth to rubbery. If the Tg falls below the temperature of the head (slightly above room temperature due to friction and player heat dissipation) then the tape is likely to squeal. Small deposits of magnetic coating on the head or other fixed surfaces will exacerbate the squealing. Of course, the drop in Tg is not an isolated phenomenon, but rather a symptom of serious binder degradation.
Lowering the temperature of the playback environment will permit successful playback of some tapes suffering from SBS. We currently have a dedicated refrigerator with both a reel and cassette machine inside. Others have reported success in using an outside balcony during cool/dry weather.
Baking a tape that generally exhibits SBS (and not SSS) may exacerbate the condition and it is not recommended to bake suspected SBS tapes.

Der Rest einschließlich Aktualisierungen kann hier nachgelesen werden:

https://richardhess.com/notes/2007/03/21...-syndrome/
https://richardhess.com/notes/formats/ma...ing-tapes/