No, I think Richards theory about the Tg is accurate about cold play. These
tapes do not show any of the signs of SSS but do respond to other methods.
Have I missed anything and someone was able to play them fine after baking?
Expert digitization services for Audio Video
Hi Res scanning for film 8mm-35mm
[log in to unmask]
On Mon, Jan 25, 2016 at 2:45 PM, Tom Fine <[log in to unmask]> wrote:
> I'm wondering if this is an extreme case of what I've been theorizing
> about the surface getting degraded from going sticky and then being baked.
> Maybe the Sony and 3M tape that Richard has to cold-play have a surface so
> screwed up, either because it goes very un-smooth or something happens
> where binder material "dries out" so it doesn't shed but remains somewhat
> "rubbery" right at the surface have a chemistry that makes hydrolysis
> particularly damaging to the physics of the material?
> -- Tom Fine
> ----- Original Message ----- From: "Shai Drori" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, January 25, 2016 1:03 AM
> Subject: Re: [ARSCLIST] One more sticky-shed data point - Richardson
> treated tape
> High Richard
>> I think we had a discussion about these two in the past. The PR-150 has
>> some batches that run fine but most do squeal. I haven't even tried baking
>> them except once just for the hell of it and of course no luck. Double
>> speed playback works when possible but I haven't had any lately so haven't
>> tried cold play yet.
>> Shai Drori
>> Expert digitization services for Audio Video
>> Hi Res scanning for film 8mm-35mm
>> [log in to unmask]
>> On Mon, Jan 25, 2016 at 6:10 AM, Richard L. Hess <
>> [log in to unmask]>
>> Hi, John,
>>> This is indeed true. HOWEVER, my success rate for baking tapes that are
>>> suffering from squealing and/or deposition that are not back coated is
>>> This raises another question. If all binder breakdown is hydrolysis, then
>>> why doesn't baking cure it 100%? I'm thinking of Sony PR-150 and 3M-175.
>>> These two seem to show the falling Tg, but don't have the shedding. They
>>> are outliers and inconsistent.
>>> On 1/24/2016 3:41 PM, John Schroth wrote:
>>> Back-coating may instigate or speed up the hydrolysis process but I
>>>> cannot ignore the fact that there are still obscure instances where the
>>>> tape had no back-coating and suffered from SS. Richard, you have noted
>>>> this in the past and I have had this happen in at least two instances
>>>> that I can recall. I'm at home today so I don't have access to my notes,
>>>> but it was clearly sticky shed on tapes that had no back-coating. So one
>>>> should not "always" equate back-coating with sticky shed.
>>>> Just my two cents...
>>>> John Schroth
>>> Richard L. Hess email: [log in to unmask]
>>> Aurora, Ontario, Canada 647 479 2800
>>> Quality tape transfers -- even from hard-to-play tapes.