[78-L] Layers of lacquer?

[Michael Biel]

  On 9/17/2010 12:42 PM, Robert M. Bratcher Jr. wrote:
> I remember some of the home use discs looking like the lacquer was painted on in
> one swipe (meaning the brush lines are visible) or had an uneven bubbly
> appearance to them. Both types are noiser than a pro disc on playback.
>
Bubbling under the lacquer is usually found on steel based discs, common 
for home discs during the war.  The steel is rusting under the lacquer.  
Brush marks are probably scuff or cleaning marks after the fact.

>>  Some lacquers were spun on. The disc was rotated (at an unknown speed)
>>  and the hot lacquer was applied (with nozzles?) to the surface. The spin
>>  gave an even coating.   Mal

This would seem to be a type of spraying.  The dipped types are spun to 
even the coating as they are lifted out.  I'm not sure if that is a 
separate manufacturing category.  I don't know of any film of any of 
these manufacturing processes.  I wonder if it might be possible to ask 
the couple of manufacturers who are still in business -- but all these 
processes are generally secret.

Mike Biel  mbiel at mbiel.com

>
>
> ________________________________
> From: Rodger Holtin<rjh334578 at yahoo.com>
> To: 78-L Mail List<78-l at klickitat.78online.com>
> Sent: Fri, September 17, 2010 9:49:17 AM
> Subject: Re: [78-L] Layers of lacquer?
>
> ... which indicates it was laid down over the disc in some fashion, not dipped,
> otherwise the centers (label area) would not display edges of any kind....
>
> Rodger
>