plate scumming

[Bret Hesler]

Is any one experiencing scumming or sensitivity within images during the run on Heidelberg Saphira Thermal PN or Agfa Energy Elite plates? Had this problem at another shop, and never really had a resolution to the problem, it would just come and go.

Thanks,
Bret

[TheProcessIStheproduct]

Had similar problem on energy elite, was just testing so did not try a bunch of things, but seemed like OK with new chem, but 1000 plates or a month into chem had scumming, and picture framing...

[jithu.sreekuttan]

dear friend i hop that ur replishment is not in correct because ur saying that scumming occurs when 1000 plates cover that means ur dev is been weak .any way u check the ph of dev every week .increase the replishment rate if required.hop that will help u .,

[rbailleu]

did anyone ever find a solution to this issue. I have something very similar on chemfree 101

[rbailleu]

hand gumming with the gum from the clean out unit has helped us. next trial new fountaion solution.

[rbailleu]

we switched ink completely reset rollers. its better buy still having problems

[Johnboy]

few years ago we had the same problem and discovered they had reduced the silver content which caused problems..we changed our supplier and cured the problem...

[rbailleu]

I will know more tomorrow. but our issue may have been a combo. blanket over packing, ink and water rollers set poorly.

[mazengh]

What is the ideal range for developer PH ?

[Perryt]

We switched to Fuji Pro V Low Chemistry (this is where the gumming solution processes the plate) last year. Initially we had problems with scumming and picture framing. We found that the problem was that the fount and ink were not totally compatible and had to find a more suitable ink and fount solution.
We have also found that we need to pay more attention to the PH of the water and monitor the RO system.

I beleive the operating parameters for this style of plates are more stiringent than that of traditional offset plates.