Color cast: The reasons may be poor quality of the original manuscript, inaccurate plate making, inconsistent control of printing conditions, good ink color control steps, non-standard light source for the sample table, etc. Lead to color cast in packaging printing
The color is dim and not bright: the reasons may be poor quality of the original, poor design of the plate-making curve, low density of the color separation film, inaccurate printing and too light imprinting, insufficient printing pressure, aging of the printing machine, excessive fountain solution, rough paper , White is too low and so on.
Text watering: The reasons may be low density of positive images, high film haze, too light imprinting, insufficient packaging and printing pressure, aging of the printing machine, excessive fountain solution, insufficient ink, etc.
Paste: Due to the ink overflow in the graphics and text of the printing plate, the imprint on the substrate is not clear, which is a malfunction of the offset printing.
Dirty plate: due to poor wetting of the printing plate, the blank part is inked.
Falling plate: The graphic fine tone of the lithographic printing plate becomes lighter, the dot and line area is reduced, and even the ink affinity is lost.
Increase in dots: The area of dots on the substrate is larger than the area of dots on the corresponding part of the printing plate.
Pile of ink: Ink or other substances are deposited on the ink roller or blanket to form embossed deposits, which affect the transfer of ink and imprints.
Deinking: The phenomenon that the metal ink roller is oxidized due to the erosion of the wetting fluid and repels the ink.
Ink emulsification: The phenomenon that the ink absorbs the wetting fluid in the packaging printing process or the printing failure caused by the excessive absorption of the wetting fluid in the ink.
Picking: During the printing process, the paper fibers, fillers or coatings fall off or be pulled off the paper surface due to the ink being too sticky or the paper surface strength difference.
Changsha Packaging and Printing Factory
Printing failure: A general term for phenomena that affect the normal production or cause printing quality defects during the printing process.
Inaccurate registration: The error of the overlap of printed traces during the process of color registration.
Ghosting: double outlines of dots, lines or texts of the same color on packaging printed matter.
Smudge on the back: The printing ink printed on the substrate sticks to the back of another printed sheet, causing smear.
Through-printing: The graphics and text printed on the paper are visible on the back.