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Printech, August, 2000
CTP, direct image, digital prepress, etc.


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From:Wayne Pferdehirt(pferdehi@epd.engr.wisc.edu)
Date:Thu, 03 Aug 2000 07:33:32 -0500


I thought some Printech users might be interested in this recent response to a technical inquiry to PNEAC. Thanks to Gary Jones for the info provided. -Wayne To: pferdehi@epd.engr.wisc.edu Subject: CTP, direct image, digital prepress, etc. I work on a P2 outreach program with local businesses, and am hearing an increasing number of shops say they are moving away from traditional prepress-to-aluminum plate, and using direct image, etc. Do you have any suggestions for online resources that may give me a more complete understanding of this process, the inputs and wastes, and how they need to be handled? Some of the specific questions I have are: 1. Are there any waste streams from this alternative process that still need to be handled as hazardous waste, or can the chemicals go down the drain? Are there any silver-containing "fixer-like" wastes that could be processed for silver recovery? Are there any other waste streams from this process that can/should be recycled? 2. Is anyone anywhere recycling or looking into options for recycling these "plastic" plates? Any help you can give would be greatly appreciated. >From: gjonesprinting@aol.com >Date: Wed, 2 Aug 2000 14:36:34 EDT >Subject: Re: CTP, direct image, digital prepress, etc. >To: pferdehi@epd.engr.wisc.edu >X-Mailer: AOL 5.0 for Windows sub 114 > >Wayne: > >To the best of my knowledge, there is no online web sites that will provide >the type of information _____ is looking for. She might be able to get some >from Kodak/Polychome, AGFA, and Fuji. > >In terms of DTP systems and environmental effects, there are two systems that >still have silver halide associated with them. One uses polymer plates and is >typically found in small "quick print" shops and a newer system has been >released for the larger commercial printers. The newer system has two >emulsions, the top layer being the silver halide and the bottom one a diazo >based one. The silver halide is imaged with white light, removed revealing >the diazo layer which is imaged with UV light. > >The other common DTP system for the larger printers will image either polymer >plates or aluminum plates with a polymer surface with laser light. The >development chemistry for these types of systems is typically high in pH >(about 12), BOD, COD, and suspended solids. > >The aluminum plates can be recycled, but I am not aware of any vendor >recycling polymer plates. Any recycling program would have to be local. > >We would need some more specific information on the system she is interested >in order to conduct additional research. > >Gary Jones >Graphic Arts Technical Foundation >200 Deer Run Road >Sewickley, PA 15143 >412/741-6860 x608 - Phone >412/741-2311 - Fax Wayne P. Pferdehirt Director, MEPP, http://epdweb.engr.wisc.edu/mepp/ Co-Director, PNEAC http://www.pneac.org Specialist, SHWEC, http://www.uwex.edu/shwec/ tel 608.265.2361 fax 608.262.6250



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