RE: Polymer Plate 80% screen Weirdness

From: Jon Lybrook ^lt;[email protected]>
Date: 02/15/04-06:19:22 PM Z
Message-id: <>

Hi Darryl,

Thanks for the response, but I don't think that's it. I've gotten the
problem from various plates from different manufacturers. I blot the
plates with pages from the phone book immediately after processing them
and do dry them with a hair dryer. I've tried varying my development time
from 2 to 10 minutes and I'm getting the spots consistently, but they are
only apparent when using the 80% density screen and only in the mid-tones
and blacks.


On Sun, 15 Feb 2004, Baird, Darryl wrote:

> Yes, they are the results of water "pooling" for too long a time while
> the polymer surface is soft and sensitive. I tend to chase them off
> the surface with a hair dryer. The sooner the better.
> ...if I could just control them, they'd look like either reticulation
> or paisley
> what manufacturer's plates did you get?
> Darryl
> -----Original Message-----
> From: Jon Lybrook []
> Sent: Sun 2/15/2004 7:05 PM
> To:
> Subject: Polymer Plate 80% screen Weirdness
> Hi All,
> I'm starting to get set up at home to burn photopolymer plates with my
> blacklight box built from Dick Sullivan's fabulous directions in his
> book
> on PT/PD printing.
> What I'm finding is the 80% density, 300lpi screen I'm using to
> pre-expose the plate is resulting in a kind of mottling effect. Looks
> like water spots directly on the plate.
> Has anyone else come across this?
> Thanks,
> Jon
Received on Sun Feb 15 18:19:34 2004

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