[78-L] Unplayable laminated pressings

[Thatcher Graham]

Now you're thinking what I'm thinking.
My first concern was that an active vacuum with a rate of cfm would 
generate the friction from the air movement.  That could generate 
vibration, and conduct through to the cartridge adding noise to the 
transfer.  I've also considered a suction cup inside the platter could 
be used, or maybe just a very low cfm once the desired flatness is 
achieved. It seems surprisingly feasible.

-- 
Thatcher Graham
Senior Field Engineer
Mediaguide




Royal Pemberton wrote:
> Hmmm....a warped but flexible disc record, and the idea of suction to hold
> the disc flat....I wonder if it would work to try to play it on a mastering
> lathe with the suction enabled on the platter (thinking of a Neumann VMS 70
> or a reasonable facsimile thereof)?
>
> On Mon, Aug 2, 2010 at 3:28 PM, Thatcher Graham <thatcher at mediaguide.com>wrote:
>
>   
>> Cardboard like paper is made from wood pulp, while binders may be water
>> soluble, cellulose is not. You'd need something more like Sodium
>> Hydroxide to really dissolve it and maybe even some mechanical action.
>> Anything strong enough to really destroy the cardboard could possibly
>> eat the laminate.
>>
>> I think it's safer to attempt to make a copy.  I was actually thinking
>> the other day that adequate suction to temporarily straighten warped
>> discs.
>>
>> --
>> Thatcher Graham
>> Senior Field Engineer
>> Mediaguide
>>
>>
>>
>> neechevoneeznayou at gmail.com wrote:
>>     
>>> perhaps if they soaked in water long enough, the cardboard would
>>> dissolve, leaving the laminate? I imagine it would be similar to a
>>> soundsheet.
>>>
>>> Interesting question.
>>>
>>> joe salerno
>>>
>>>
>>> David Lennick wrote:
>>>
>>>       
>>>> I have two Jack Teagarden records on VIKING, laminated cardboard discs,
>>>>         
>> severely warped. The plastic containing the grooves could probably be lifted
>> off the warped core..has anyone ever tried this, or would the discs be
>> destroyed?
>>     
>>>>
>>>> dl
>>>>
>>>>
>>>>
>>>>
>>>>
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