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printech, May, 2000
new ink testing


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From:Deb Jacobson(djacobson@istc.illinois.edu)
Date:Mon, 15 May 2000 08:55:55 -0500


Amr - This is a reply to the same or similar inquiry you previously posted from the Ask PNEAC feature on the PNEAC web site. This reply comes from Bill Sunter of the Gravure Association of America. I hope this answers your questions. Debra Jacobson ask pneac questions from Egypt The best source for ink information is NAPIM but: Lab testing of ink should be done in such a way as to eliminate as many variables (human and otherwise) as possible. As such you should obtain an automated laboratory Proofer, many different styles are available. One contact would be TMI, Testing Materials Inc. in New York at + 800-678-3221. Secondly a standard substrate should always be used and the ink should be tested under controlled conditions of viscosity and temperature. Test will usually include weight per gallon or liter, color space, and dilution ratio. Other specific tests may be required based on finished product needs i.e. light fastness etc. Ink testing on press is actually the same as in the laboratory. Care must be taken to assure equipment conditions as well as substrate and ink. The main troubles with inks, gravure or otherwise are strength, color accuracy and printability. Common print defects can be found in the Gravure Process and Technology text book. Ink manufacturers are usually adept at following a formula. Problems associated with ink quality are usually found to have originated elsewhere; in ink handling, or due to press setup. What is the ideal specification? What ever works. Ink chemistries vary widely the key is consistency. That is the best I can do with the information they provided us. Give me more details such as test for what, spec for what type, etc. and perhaps I can help out a little bit more. Bill Sunter - GAA



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