I do not have any idea why some manufacturers put a IPA limit on the labels of their fountain solutions. My guess is they have little confidence their product will work without IPA and they are subtly suggesting alcohol be used with their product. At most companies the labels and promotional materials are not written by the same group of people who develop the products, so there is no reason to take most of this verbiage with more than a grain of salt. Another possible explanation could be marketers do not want to frighten off potential customers who have reservations about running without IPA.
The inverse of your question is why do suppliers not put upper limits on IPA. If solvents are bad for the printing process you would think this would be easily demonstrated with alcohol use. The first continuous dampening press I ran (a 36" single color Harris) had been set up by the installer with Rosos fountain solution and 25% IPA. The pressman who ran the press on the shift before mine would routinely boost his alcohol content in the belief it was always evaporating and my hydrometer would sometimes sink to the bottom of the tank when I checked IPA content at the begining of the day. He didn't seem to get any less done per shift that I did, and no one ever commented that my work was better/worse than his, though I consumed a lot less IPA in the course of a shift.
I take it you are not a Victorian, not thinking highly of VB.
Daniel T Roll
I drink the VB on tap as its available at every venue, but in a bottle it is foul!!
I think you miss interpreted my post, I stated that a lot of the alcohol free or reduced founts DO set an upper limit for IPA
For instance they say do not exceed more then 5% IPA
No, I think I understood your question and replied to it specifically.
Daniel T Roll
Ahhh sorry for that, early morning pre coffee confusion... A slap to the back of the head for myself..
Originally Posted by Dan Roll
Maybe you might have some answers to the "A little test" thread. possibly I wasted my time and it means nothing.
Both excessive fount and/or IPA can cause attacking of the ink.
As Dan said, an alcohol free fount mentioning IPA dosages obviously doesn't show that there is much confidence in it working without IPA.
I wouldn't be very confident in a fount that was labelled as IPA free/IPA reduction/use up to ?% IPA
Having said that, sometimes a printer feels more comfortable when moving to IPA free printing, knowing that they have the option of adding some IPA if they want, even if it isn't actually necessary; as otherwise they may have the impression that it's all or nothing, which it isn't.
I don't think that this needs to be reflected on the label though, simply telling the printer would suffice in this case.
There are so many factors to condor when regarding solutions that it's near impossible to pin it down on a single forum post. Some solutions run a much higher concentration than others and it varies depending on the company and environment.
That said, not a fan of IPA. I'm more of a porter/stout guy.
Anther that agrees to this, Good to see that there are some suppliers out there that agree to this.
Originally Posted by Coastline
Dan is of the opposite believe, and states that the solvents in the fountain solutions won't attack the ink.
But it don't change ink mileage, and never forget dat.
The term "alcohol free fount" is a little like "100% vegetable based ink", they both are incomplete descriptions.
Founts designed to run with no IPA will often contain different alcohols, often with greatly reduced volatility, therefore by using such a fount, and continuing to add IPA to it in large %ages, you will end up with a massively aggressive fountain soution....never a good thing!!
Some founts are designed to run with "reduced" IPA, at levels of say 1-5%, thus providing the print benefits of IPA with a reduced level of VOC. Again, such a fount could have an alcohol/glycol present and the IPA level must be restricted.
Its a bit like taking painkillers...its ok to have Nurofen, Codral and Lemsip at the same time....but you must give thought to the fact that you are accumulating your dose of paracetamol, or else you will have no headache, a clear nose and soothed throat as they wheel you into the hospital
....and as for the VB, Bundy is the best alcohol!!
Thankyou for your reply! Another industry representitive that believes fountain solution can be aggressive towards ink.
Originally Posted by DIC Australia
Do you beleive that alcohol or its replacements can have any effect on ink mileage?