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We only changed the ink because it was the only variable we could change. There is only one plate for this press, there are no chemicals, there are very few inks. Luckily VanSon were on the game and open to picking up the ball with a new type of ink, the existing ink manufacturers were not...

Problem solved....

Yes it did, see here....

Both are working well.

Once upon a time, back in the day, when running metallic gold, I would always run a yellow down first, this really boosted the gold effect. Single colour press, dry on dry. Have not touched metallic for 20+ years now and dont miss it one bit, any jobs where we need a gold or silver, I just run...

Dry Ice Blasting & Cleaning : Cryogenesis

HI see my other thread here http://printplanet.com/forums/sheetfed-web-offset-discussion/30981-ink-order-4-colour-process for full details. We are now using Presstek/Van-Son "Di-Envi" inks. And yes we always use the dryer, I have modified my IR unit to be closed-loop control so it looks after...

;) Come on now you guys, shake and make up :D I fully understand Gordon's point of view though but as the results do indeed speak volumes, we will be staying with the revised order for the current time at least. Obviously there is something odd going on but, as we are battling the problem in a...

UPDATE Following on from the trials we undertook in conjunction with Van-Son and Presstek, We now have a totally new ink formulation to use, Presstek are marketing it as "Di-Envi" waterless ink. It came in back in November and we have been running it since then with near perfect results, it's...

Personally speaking, I would have thought that a QC manager that has no experience in print is going to have a very tough time ahead, unless of course you have some very lenient press op's. :)

Probably just an effect of the lightweight paper and the varnish polymerizing, its a chemical reaction and can generate heat. Looks like a good varnish though :)

Then it can only be chemical reaction, especially as coverage was high. Probably would not happen if the first run was 100% dry, but in the real world.....

Maybe the thinner paper having less body to soak the ink up, has allowed the total volume of ink on both sides to combine and re4ach a critical point. As you say, if you have used the products before, but not on this stock, it could well be this reason. Does the press not have IR drying or was...

The fact that it was folded and bound and still got hot would point to a chemical reaction, possibly the ink reacting with the varnish.

Ok, thanks, my experience has been with heat-set sheet-fed which was my assumption. In that case it is more likely to be an oil or chemical reaction issue, it is still a serious matter though, maybe time to get the ink people in for a chat?

Print that is over-heated can self-combust. You have witnessed a near-miss of this, it can be very dangerous. I presume you are running heat-set? Maybe your heat controller/sensor is out of calibration.

Yes, we know. We are running waterless and finding a good ink that is also ISO standard hue is next to impossible. We are testing a new mix on behalf of Van-Son and it's nearly there, just the yellow is slightly too tacky which causes duct contamination on low coverage jobs. Running the revised...

No need now, we are getting good results running K-M-C-Y

I tried adding some take-off stripes and bars today as we were going to be running troublesome stock all day. We managed to get a 10mm stripe down each side and a 5mm one across the back edge. I have just finished running for the day, 12 jobs done and the yellow ink is as fresh as it was this...

We run semi-hard manilla under packing, this gives us the best dot generation and despite the very odd smash caused by a folded corner, i can usually go 6-9 months on a set. We could use a 1mm rubber u/b but the dot gain is pretty rough. I must add that we run waterless so the manilla is fine...