Intermediate roller in water supply on plate is not being used

[Parth]

In my Heidelberg SM 72 i was having issues with ink water balance.
The mechanic suggested that the pan roller and other water roller are old so you should remove intermediate roller and use like this
Now i have purchased new rollers but still i have not put intermediate rollers
Now when my ink supply roller is on 8-9 points the water is still on 60-70% in all the units
Because of this my ink doesn't dry as excess water is transferred in ink
I talked to mechanic he is still saying that intermediate roller is of no use and it will reduce printing quality
Now i am confused whether i should put it or not

 

[junker1984]

My suggestion is to adhere to the manufacturer's well researched and proven and established printing protocols. Not my place to say your mechanic is wrong, but in 30 years of wrenching on Heidelberg presses, I've never seen nor heard of anyone going this route.

 

[Joe Burger]

You should first check the fountain water. PH and Conductivity maybe is not correct. PH between 4.8 to 5.3 and water hardness is always a matter

 

[turbotom1052]

The amount of fountain solution that reaches the plate is controlled by 2 different means. The first way is how thin a film that is metered between the pan roller and metering roller. The second way is by the speed of the pan roller. If you feel that your pan roller speed is up too high for your liking you could just crack open the metering roller to allow a thicker film to pass through. This will allow you to run the motor speeds down. I personally don’t see a problem with roller speeds at 65%

 

[Adil]

Hi sir

The problem you're having is emulsification, also known as orange peel. As the technician said, it could be a problem with the glazed roller not transferring the dampening solution correctly, but it could also be caused by other factors:

Too much dampening
Unfavorable dampening values
Temperature too high in the inking units
Plate requiring too much dampening
Dampening unit settings
Low ink consumption
To resolve these issues, you should:

Reduce dampening (to the dry limit)
Improve dampening quality (pH, IPA, hardness)
Reduce the inking unit temperature
Use an alternative plate (if consumption is very low)
Improve the dampening unit settings
Integrate ink absorbers if ink consumption is very low
Drying also depends on the quality and type of printing substrate (absorbent or not). Among the causes of drying are:
Incorrect ink selection for the substrate
Too much dampening solution in the ink
Ink film thickness too high
Unfavorable dampening values
The solutions are as follows:
Choosing the appropriate series for the application and substrate
Reducing dampening
Reducing ink film weight
Improving dampening quality (pH, IPA, hardness)
I have prepared a complete training slide presentation for all printing problems; if you need it, contact me.

Good luck

 

[Jack liston]

Decalcify your rollers good roller maintainable is crucial for water control.