4 roller crestline water unit

snoozer

Member
Have a 4 roller crestline water system on a ab dick 375 , there are only three adjustments on this unit , tried to follow the instructions on the installation manual with no luck , am thinking the ends on the form might be a little swollen but still within acceptable range,having scumming problems , any ideas ? Thanks
 

smalloffsetpressexperts

Well-known member
What does the form stripe measure? The 3 adjustments are easy. They adjust the lift of form to change plates,
One adjusts the separation between the metering roll and form. One is for the form pressure.
The 4 unit Crestline's were known to lose parallel and scum. Drop the op handle to to lower crestline to plate and look at the stripe from metering to form
 

nhprinter

Well-known member
Honestly even if all of your adjustments seem to be ok, if the rollers are more than a couple of years old you should replace them. Crestlines are like that. No matter what you adjust you're going to have problems with older rollers.
 

SteveSuffRIT

Well-known member
Some ways to check roller pressure are:
Seeing light gap between rollers,
Tension on paper being pulled through nip point,
3 second delay then look at width of stripe on other inked rollers or form to plate.
Swollen roller will put more pressure at nip, reducing water, causing dry-up or catchup.
 

smalloffsetpressexperts

Well-known member
The metering roller is rubber also just a high durometer. Also the bearings fail in that roller. Also in the frames. Also the frames need to be squared when replacing rollers.
 

De-Inking

Avanti
Sustainable Printing Goes Far Beyond Using FSC Certified or Recycled Paper
This informative paper on deinking: demand, principles, problems and solutions also explains why printing technologies are not all equally compatible with paper recycling systems; and why just a small fraction of printed material in the paper can cause difficulties.
Link To White Paper

   
Top