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 that can cause roller stripping: most common are glazed rollers and calcium buildup from the paper. Other causes are over emulsified ink, poor ink water balance, and too much acid or gum in the fountain solution. I suggest you deglaze the rollers with a deglazing compound and replace old, hard rollers that can't be rejuvenated. Also, correct any ink water balance problems, check fountain solution pH and conductivity, and make sure that fountain solution concentrate or gum was mixed in the correct proportions.
U.S. International Trade Commission Approves Tariffs Targeting Aluminum Lithographic Printing Plates from China and Japan
On October 22, 2024, the U.S. International Trade Commission (USITC) determined that a U.S. industry is materially injured by imports of aluminum lithographic printing plates from China and Japan. The U.S. Department of Commerce determined that the printing plates are being sold at less than fair value and subsidized by the government of the People’s Republic of China.
