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Re: [TCML] Secondary and Primary Assistance
In a message dated 3/20/08 10:11:53 P.M. Eastern Standard Time,
>Just out of curiosity, is this known to be true (i.e. you've measured the
>conductivity of the ink printed on the form with a megohmmeter or something
>similar), or is it an assumption?
FWIW, the black pigment used for flexographic printing on cardboard
products is carbon. Our ink supplier told us they actually make their own, by
burning fuel in a reducing atmosphere, and scraping the resulting soot off the
inside of multiple chimneys. Black ink is the nastiest color to get on you, I
can tell you that!
In a pinch, or to conserve ink that would otherwise be thrown away, we
blend "junk" inks of various colors together to make black, but it's a pretty
weak black we only use for low-quality jobs.
And FWIW I also used to work for the company that makes those cardboard
tubes .Although I wasn't involved with those particular cardboard tubes, I'd
guess the technology involves a thin layer of white glue holding the layers of
paper together that forms the cardboard. And the residual moisture content
of the paper is probably pretty high. But I would agree that the black ink
would be the worst problem!
Should be easy to check with an insulation tester, even a crude setup.
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