[alt-photo] Re: ziatype

[Paul Viapiano]

Good tips always bear repeating...



On May 3, 2012, at 5:32 PM, "Don Bryant" <donsbryant at gmail.com> wrote:

> Looking at the face of my NuArc 26K, the vacuum gauge maxes out at 30 inches
> - of mercury. Same for my gauges on my vacuum pumps for my vacuum frames,
> ditto for my refrigeration gauges.
> 
> If you want to start your vacuum rush you may wish to start reading here:
> 
> http://en.wikipedia.org/wiki/Atmospheric_pressure
> 
> Then after dinner you can follow up here:
> 
> http://nd.edu/~nsl/Lectures/urls/LEYBOLD_FUNDAMENTALS.pdf 
> 
> Anyway as a practical matter for printing hydroscopic processes such a Zia
> or Pop Palladium, about 5 inches of vacuum will suffice to prevent moisture
> draw down. What really helps is to encapsulate the coated substrate in a
> sandwich of mylar. 2 mil optical mylar between the film emulsion and the
> coated paper surface and a heavier barrier underneath, above anything else
> placed on top of the vacuum bed to prevent imprinting of the vacuum bladder
> texture.
> 
> All of this I think, has been oft repeated over the years here on the list
> and other places on the net.
> 
> Don
> 
> 
> -----Original Message-----
> From: alt-photo-process-list-bounces at lists.altphotolist.org
> [mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
> EJ Photo
> Sent: Thursday, May 03, 2012 8:19 AM
> To: 'The alternative photographic processes mailing list'
> Subject: [alt-photo] Re: ziatype
> 
> I thought the gauges were in psi and not being in front of mine right now I
> can't say otherwise. 
> 
> Eric Neilsen
> Eric Neilsen Photography
> 4101 Commerce Street, Suite 9
> Dallas, TX 75226
> 
> www.ericneilsenphotography.com
> skype me with ejprinter
> Let's Talk Photography
> 
> 
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