[78-L] dewarping shellac, was AFRS

[CelticGuitar666 at aol.com]

I slowly heat them on a piece of glass in oven I forget what the temp is  
but if you let them cool slowly they will be flat and not out of round. 
Summer  time is great for this as I place them out in the sun for a short period. 
 just don't forget them they don't tan well
Dwight
 
 
In a message dated 2/12/2011 9:50:39 A.M. Eastern Standard Time,  
neechevoneeznayou at gmail.com writes:

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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