Common offset ink failure analysis - ring white spot phenomenon

Ten, ring white spot phenomenon

Cylindrical white spots appear in printed graphics.

Reasons: (1) The ink drying film is adhering to the ink on the printing plate blanket. (2) Paper powder, dust, and other foreign materials mixed with ink.

Treatment method: (1) Do not mix the ink drying film with the ink when removing the ink from the tank. (2) Replace the paper. (3) Carefully clean ink fountains, rollers, blankets, and plates. (4) It was found that the ink was replaced when ink was present in the ink.

Source: "Printing Technology"

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