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We printed a job on a plastic sheet with no problems on the first side, but when we printed the back side some of the images had a mottled appearance and it appeared there was a faint image of the first side appearing in the mottle. What could have caused

This may be a "trapping ghost." In the pile, drying ink solvent vapors from the first printed side can be deposited on the back of the next sheet. The vapors can change the surface energy or dyne level of the plastic, resulting in mottle and a ghosted image. You might want to try winding the delivery …

My ink rollers are not carrying the ink evenly; there are areas with little ink on the roller surface. The problem seems worse on the rollers near the plate cylinder. Why is this happening and how can I correct the problem?

This condition sounds like roller stripping. Roller stripping can look like the ink is in bands on the rollers. Basically some of the gum in the dampening solution is being carried on the surface of the ink rollers, attracting the fountain solution and repelling the ink. There are many conditions …