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| Posted on 3/28/08 at 05:32 AM | |
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Interesting point. Copper acetoarsenate (cupric acetoarsenate) is actually very toxic if breathed in raw form. It has actually been used as an insectiside and also for killing mollusks (barnacles). I think the main process that is used for getting away with this additive (as a pigment) (a)is the fact that it is very unstable in acids. It breaks down well....but into what? (b) it "should" be stable if it is incapsulated within the rest of the compound it is used in. So....if you cure fully, leftover ink and then dispose of it, it should be fine. This also goes a long way toward what I think should be done with screen reclaiming. Your screens should be solvent washed until they are ink free in the degradent phase of reclaim. You need to do a really good job of scraping out the excess as well so as not to overload the solvent too quickly. Then if you can let the solvent seperate, have the sludge taken away by someone who has the correct equipment to get rid of teh ugly stuff. As much as people begrudge safety clean, they are one of the best certified disposal comapnies in the US for waste streams liek this, with a very good downstream track record. This is not to say that safety cleans solvents are what we would use, but you do not have to use their solvents to use their services for disposal. With the right speration equipment at your shop and good training and habits, an average two automatic shop should be able to get away with maybe 2-3 drums of disposal per year...at an average of $900-1,200 per drum. Too much? Break it down by how many shirts you print, write it into your paperwork and charge it off to your customer. The same thing is done to everyone in all 50 states when you buy a set of tires. The average is $2 per tire removal. Ray | ||
 
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