Hi JohnyPrint,
I have been dealing with this problem ever since I´ve started work in offset-printing industry. Unfortunately, there is several reasons for this - therefore there is several solutions. First of all, you need a water analysis. You need to have the mineral (salts) content right. If the dH is low you can use additives, if it´s high you need softening additives, but it does not work so well. The best you can do is buy anR-O; as it was mentioned here before. As I see it, your problem should be a soft-water. The water in your system is "feeding" it self minerals from paper, ink and so on, bringing all scale of other chemicals with it. That can travel through out the whole system into the ink-bank, contaminating all the ink there is. Then after a water exchange your problem is quickly back. That´s the most common reason.
You might find a accurate numbers within your press-manual, but usually the values should be: chlorides - under 25 MG/L, nitrates under 20MG/L, sulphates under 50MG/L. The overal dH 8°dH-12°dH
We have almost the same press MR710 5/5 - with AtlasCopco- reelstand and today - our water ph is stable. We had to change a supplier of our fountain solution too, but the main reason was that the new one is coming, say, every second week to checkup on things, make some measurements by external devices, sending a report. That´s what I expect from my supplier.. Good luck
Michal
I have been dealing with this problem ever since I´ve started work in offset-printing industry. Unfortunately, there is several reasons for this - therefore there is several solutions. First of all, you need a water analysis. You need to have the mineral (salts) content right. If the dH is low you can use additives, if it´s high you need softening additives, but it does not work so well. The best you can do is buy anR-O; as it was mentioned here before. As I see it, your problem should be a soft-water. The water in your system is "feeding" it self minerals from paper, ink and so on, bringing all scale of other chemicals with it. That can travel through out the whole system into the ink-bank, contaminating all the ink there is. Then after a water exchange your problem is quickly back. That´s the most common reason.
You might find a accurate numbers within your press-manual, but usually the values should be: chlorides - under 25 MG/L, nitrates under 20MG/L, sulphates under 50MG/L. The overal dH 8°dH-12°dH
We have almost the same press MR710 5/5 - with AtlasCopco- reelstand and today - our water ph is stable. We had to change a supplier of our fountain solution too, but the main reason was that the new one is coming, say, every second week to checkup on things, make some measurements by external devices, sending a report. That´s what I expect from my supplier.. Good luck
Michal
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