nothernlights
Member
We are printing a blue spot color ( about 80% coverage ) on first unit and a yellow spot color ( about 5% coverage ) on the second unit. As they are printing, the yellow print is coming out greenish. When they are printed seperately, the yellow and blue print out alright. Our press operator says that the blue from the first unit is somehow mixing with the yellow ink causing the greenish colour.
My question is what is the best way to prevent the yellow ink from being printed out "greenish". In order to get around the problem for the time being, I am printing the blue first ( 1st unit ), wait for it to dry and then print the yellow ( 2nd unit ) on the second pass.
Any suggestions would be greatly appreciated.
Background :
Normally for this job we would print the BLUE on the 2nd unit and YELLOW on the 1st unit. We switched it around because there was a visible banding ( white ) on the Blue print. The banding problem is a known problem for this machine ( 1972 SORDZ ). We are planning on selling the press this year so it may not be worth to fix the banding problem.
Note :
On our multi colour jobs I also noticed that the image from the 1st unit makes it's way to the blanket of the second unit as the machine is run over time. Is this normal?
My question is what is the best way to prevent the yellow ink from being printed out "greenish". In order to get around the problem for the time being, I am printing the blue first ( 1st unit ), wait for it to dry and then print the yellow ( 2nd unit ) on the second pass.
Any suggestions would be greatly appreciated.
Background :
Normally for this job we would print the BLUE on the 2nd unit and YELLOW on the 1st unit. We switched it around because there was a visible banding ( white ) on the Blue print. The banding problem is a known problem for this machine ( 1972 SORDZ ). We are planning on selling the press this year so it may not be worth to fix the banding problem.
Note :
On our multi colour jobs I also noticed that the image from the 1st unit makes it's way to the blanket of the second unit as the machine is run over time. Is this normal?