Message:

<p>[QUOTE=&quot;krispy, post: 2022640, member: 19065&quot;]Many materials can and have been used in off-set lithographic commercial printing. See here for <a href="http://www.dynodan.com/printing-process-explained/lithography-files/offset-plate-technology.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.dynodan.com/printing-process-explained/lithography-files/offset-plate-technology.html" rel="nofollow">plate technologies</a> and to understand how and when each might be used. Aluminum and other metal plates are durable (especially for larger runs as they don&#039;t wear out as quickly) but they&#039;re more expensive. Newspapers and magazines tend to use plastics or polymer plates and other newer cheaper technologies, which are are all cheap and easy to replace and dispose of plates. Plastic is cheaper but not suitable for quality reproductions and longer press runs. Plastic is also flexible. Both Aluminum and plastic plates come in a range of very thin gauge sheets, so are flexible in order to wrap around the printing cylinders of commercial mass production presses. Plates are manufactured or can be made photosensitive with coatings (see above link) for transferring an image onto the plate. A positive working image can be off-set (hence the name) onto a rubber blanket or roller on the press then transferred onto the paper substrate that was used for holding the printed design.</p><p><br /></p><p>I suspect these are some form of &#039;image carrier&#039; or &#039;positive working plates&#039; they used for a run of lithographically reproduced designs of originals that had been done by intaglio (engraved dies) printing. Whatever their application, it must have called for a cheaper and quicker form of printing or something in large edition without need for high quality -or- someone else wanted to reproduce their work but were limited to a cheaper form of printing, off set in place of more costly and quality intaglio.</p><p><br /></p><p>I wonder, can you find an example printed of these plates done in lithographic process, and who the printers might have been, in order to track down the exact type of litho process used...</p><p><br /></p><p><br /></p><p>BTW, that is <i>rubylith adhesive tape </i>around the edge. It comes on rolls and is a common material around photo labs and printing environments. It may have been used interchangeably with other adhesive backed tapes, just used for convenience here, when securing the plastic sheet over the image area of the plate to protect it while in storage or if/when shipped.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in