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Re: [BKARTS] photopolymer plates



Any process where you are pressing a raised surface against a plane one can
create indentation, that is a simple law of physics. It depends on the
adjustment and pressure used.
Photopolymer is not one product but the name given to a group of materials
used to create plates for printing, among other things. Those that are very
hard will stand up to pressure better than the softer ones.
Whether indentation is a sign of letterpress, good or bad, depends entirely
on the view-point of the printer and ultimately the customer.
As a letterpress printer, I always strive to achieve a kiss impression with
the ink just resting on the surface of the paper. This I consider the ideal
and is realy important when printing double sided sheets on thin 'bible'
paper. Any indentation would shew through in the reverse and interfere with
the printing and legibility on that side of the paper.

The simple answer to the question is 'yes' an indentation can be created
with photopolymer but for good letterpress it should be invisible.
Mike   England
----- Original Message -----
From: "Ann Grasso" <A@xxxxxxxxxxxx>
To: <BOOK_ARTS-L@xxxxxxxxxxxxxxxx>
Sent: Sunday, June 22, 2003 5:43 PM
Subject: [BKARTS] photopolymer plates

| I am appreciative of the clarifications and distinctions made concerning
| different printing processes.
|
| Might someone clarify whether photopolymer plates create any indent or
| raised area when printing letters? I believe that when letters are set
| individually with wood or lead, they are impressed down, into the paper.
| When offset, the letters raise up from the paper. But when using a
| photopolymer plate is there a way for the letters to be either indented
into
| the paper or raised from the paper plane? My one and only toe into this
| field provided an outcome where the plate size was indented, but the
actual
| work, both image and letters, were all on one plane.
|
| Thanks for your help, A.
|
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             ***********************************************
     *Postings may not be re-printed in any form without the express
     consent of the author - Please respect their contributions & ©*

            BOOK_ARTS-L: The listserv for all the book arts.
      For subscription information, the Archive, and other related
            resources and links go to the Book_Arts-L FAQ at:
                      <http://www.philobiblon.com>

        Archive maintained and suppported by Conservation OnLine
                    <http://palimpsest.stanford.edu>
             ***********************************************


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