[78-L] dewarping shellac, was AFRS

[neechevoneeznayou at gmail.com]

I've never had much success dewarping shellac. Yes it can be warmed 
gently and pressed into a flat condition, but somehow the thing seems 
afterward to be out of round.

Anyone else ever encountered this?

joe salerno

On 2/11/2011 9:45 PM, Steven C. Barr wrote:
> From:<neechevoneeznayou at gmail.com>
>> OK, so if vinyl is warmed sufficiently and put under some pressure, it
>> can be forced to change shape, which is how vinyl records are made in
>> the press as we all know. Same for shellac, altho lower temps will warp
>> shellac. I assume a record store at an angle or with something on top of
>> and below could do the same over time, be forced out of a flat
>> condition. If these transcription records were packed tightly in boxes,
>> perhaps this will not have occurred.
>> That would explain why I have seen so little warping in my vinyl
>> collection, excluding those records which came factory pre-warped.
>>
> The OTHER difference is that shellac records exposed to high
> temeratures becdome flexible...and retain their new shape when
> cooled. Repairing this requires only that the records be reheated
> to the point of flexibility and manually be bent into "flatness"...!
>
> OTOH, vinyl records when "over" heated will actually expand
> physically...creating a "warp" when the newly expanded vinyl.
> with "no place to go," forces the record to "warp" and thus
> accomodate the expanded vinyl!
>
> Steven C. Barr
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