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You said it for yourself. Increase the IPA and you'll get better. Reaction if you can call it that, happens when the ink is drying which starts at the very moment the paper leaves the blanket cylinder. In the system, IPA constrains water flow to controllable levels. I insist, if you wish to...

Alcolor system has to use IPA to work properly. I use an additive called AlcoDown to reduce the need of IPA to 8-10%. I suppose in order to work alcohol free you need to specifically ask advice from your roller supplier. Horizontal play is not an issue, just pay attention to the pressure that...

I'm sorry for your problems. If you are printing with the standard type water rollers, you can't work without IPA. The best you can do is reduce it by adding to the water an agent that allows you to do so. Still you have to use at least 10% of IPA in order to print perfectly. If you insist not...

I wouldn't add anything in the ink, if I were you. Check your conductivity first or/and you ph value. Adding stuff will make things worse

Stream feeding is designed to meet the need for speed. So your criteria should be determined by your production needs. Myself, I operate the whole printshop on my own so I need speed and since I have no personnel, I could invest some more money on a more expensive streaf fed press. Don't stick...

I'm sorry, I meant I would not buy ABDick press as their quality doesn't meet my standarts.

Problem solved Thank you all for your answers. The problem was solved by using a different ph agent and alcohol as well. Or else I should change my damp rollers to a different shore grade. Frankly, the worst of all was and still is, the chemical suppliers do not know much (or anything at all!)...

I attach a picture showing what is usually but not always happening. I dont think I used to much water and/or ink to obtain balance. Press printed almost good in the rest of its width, but at the edge water was excessive. Bridge roller is set to 2mm stripe. Maybe I should mention the proccess...

I know exactly what you mean and you might be right. But scumming occurs not after a stop but during run. Moreover, after a stop things balance is perfect. I have the option of engaging or not the bridge roller but I see no or little difference -as I mentioned I found its critical to adjust it...

new data Well, the instability of water is dealed as follows. Every day I start printing using the same values as a base setting as those values I have found them to be good ones. If the job of the humidity conditions demand so, I change the values accordingly. Values between the two printing...

I operate a GTOZS. Since day 1 I havent managed to print well because of the instability of the dampening system. I concluded to the following: I replaced all rubber rollers - inking and dampening - adjusting everything by the book. I use alcohol free solution and water no Ph additive to my...

As the title indicates, I have a streamfed GTO and trying to print some huge amount of envelopes. Is there a tricky way to make it take the envelopes non stop even if I have to reload every 250 envelopes? I already googled for feeders for this purpose but they are far more expensive than my...

Maybe something in the water has changed so you need to alter your pH settings meaning if the pH of the water has changed to more, and you keep adding the same amount of pH agent, you are printing on higher pH levels thus your ink doesnt dry fast enough or at all. If you printed on coated stock...

I had the same problem and forced to replace all rubber rollers. Problems now are kind of adjustment corrections. But in general now situation is near perfect.

I have this strange problem. The alcolor motor on printing unit 2 doesn't slow to the preset or when pressing the minus dampening button. that had happened before but I switched the controlling cards from the 2 units in the electronics cabinet and the problem disappeared. I did the same but no...

Thank you for your replys. It is true that the packings should be changed by experimentation. It is time to change a the first unit blanket so I will also change the packing. I will let you know of the results.

I don't think they will do, but anyway thank you for the try. My machine has streamfeeder and moreover time working with it pussed me to learn and solve most of the problems. Thank you.

well ste then -I didnt know the blanket was common to the 2 printing units. Light first, dark then

color sequence i don't know especially this machine but in general terms, you should print first the darker color then the lighter. After all you tried lighter then darker and you failed. But if you do it the way I suggest, the lighter ink contaminates the darker so you have really no trouble...

jak, check your email.